1 /* $FreeBSD$ */ 2 /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * This code is referd to RFC 2367 35 */ 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 #include "opt_ipsec.h" 40 41 #include <sys/types.h> 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/mutex.h> 47 #include <sys/mbuf.h> 48 #include <sys/domain.h> 49 #include <sys/protosw.h> 50 #include <sys/malloc.h> 51 #include <sys/rmlock.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/sysctl.h> 55 #include <sys/errno.h> 56 #include <sys/proc.h> 57 #include <sys/queue.h> 58 #include <sys/refcount.h> 59 #include <sys/syslog.h> 60 61 #include <net/if.h> 62 #include <net/if_var.h> 63 #include <net/vnet.h> 64 #include <net/raw_cb.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/ip.h> 69 #include <netinet/in_var.h> 70 71 #ifdef INET6 72 #include <netinet/ip6.h> 73 #include <netinet6/in6_var.h> 74 #include <netinet6/ip6_var.h> 75 #endif /* INET6 */ 76 77 #if defined(INET) || defined(INET6) 78 #include <netinet/in_pcb.h> 79 #endif 80 #ifdef INET6 81 #include <netinet6/in6_pcb.h> 82 #endif /* INET6 */ 83 84 #include <net/pfkeyv2.h> 85 #include <netipsec/keydb.h> 86 #include <netipsec/key.h> 87 #include <netipsec/keysock.h> 88 #include <netipsec/key_debug.h> 89 90 #include <netipsec/ipsec.h> 91 #ifdef INET6 92 #include <netipsec/ipsec6.h> 93 #endif 94 95 #include <netipsec/xform.h> 96 97 #include <machine/stdarg.h> 98 99 /* randomness */ 100 #include <sys/random.h> 101 102 #define FULLMASK 0xff 103 #define _BITS(bytes) ((bytes) << 3) 104 105 /* 106 * Note on SA reference counting: 107 * - SAs that are not in DEAD state will have (total external reference + 1) 108 * following value in reference count field. they cannot be freed and are 109 * referenced from SA header. 110 * - SAs that are in DEAD state will have (total external reference) 111 * in reference count field. they are ready to be freed. reference from 112 * SA header will be removed in key_delsav(), when the reference count 113 * field hits 0 (= no external reference other than from SA header. 114 */ 115 116 VNET_DEFINE(u_int32_t, key_debug_level) = 0; 117 static VNET_DEFINE(u_int, key_spi_trycnt) = 1000; 118 static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100; 119 static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */ 120 static VNET_DEFINE(u_int32_t, policy_id) = 0; 121 /*interval to initialize randseed,1(m)*/ 122 static VNET_DEFINE(u_int, key_int_random) = 60; 123 /* interval to expire acquiring, 30(s)*/ 124 static VNET_DEFINE(u_int, key_larval_lifetime) = 30; 125 /* counter for blocking SADB_ACQUIRE.*/ 126 static VNET_DEFINE(int, key_blockacq_count) = 10; 127 /* lifetime for blocking SADB_ACQUIRE.*/ 128 static VNET_DEFINE(int, key_blockacq_lifetime) = 20; 129 /* preferred old sa rather than new sa.*/ 130 static VNET_DEFINE(int, key_preferred_oldsa) = 1; 131 #define V_key_spi_trycnt VNET(key_spi_trycnt) 132 #define V_key_spi_minval VNET(key_spi_minval) 133 #define V_key_spi_maxval VNET(key_spi_maxval) 134 #define V_policy_id VNET(policy_id) 135 #define V_key_int_random VNET(key_int_random) 136 #define V_key_larval_lifetime VNET(key_larval_lifetime) 137 #define V_key_blockacq_count VNET(key_blockacq_count) 138 #define V_key_blockacq_lifetime VNET(key_blockacq_lifetime) 139 #define V_key_preferred_oldsa VNET(key_preferred_oldsa) 140 141 static VNET_DEFINE(u_int32_t, acq_seq) = 0; 142 #define V_acq_seq VNET(acq_seq) 143 144 /* SPD */ 145 static VNET_DEFINE(TAILQ_HEAD(_sptree, secpolicy), sptree[IPSEC_DIR_MAX]); 146 static struct rmlock sptree_lock; 147 #define V_sptree VNET(sptree) 148 #define SPTREE_LOCK_INIT() rm_init(&sptree_lock, "sptree") 149 #define SPTREE_LOCK_DESTROY() rm_destroy(&sptree_lock) 150 #define SPTREE_RLOCK_TRACKER struct rm_priotracker sptree_tracker 151 #define SPTREE_RLOCK() rm_rlock(&sptree_lock, &sptree_tracker) 152 #define SPTREE_RUNLOCK() rm_runlock(&sptree_lock, &sptree_tracker) 153 #define SPTREE_RLOCK_ASSERT() rm_assert(&sptree_lock, RA_RLOCKED) 154 #define SPTREE_WLOCK() rm_wlock(&sptree_lock) 155 #define SPTREE_WUNLOCK() rm_wunlock(&sptree_lock) 156 #define SPTREE_WLOCK_ASSERT() rm_assert(&sptree_lock, RA_WLOCKED) 157 #define SPTREE_UNLOCK_ASSERT() rm_assert(&sptree_lock, RA_UNLOCKED) 158 159 static VNET_DEFINE(LIST_HEAD(_sahtree, secashead), sahtree); /* SAD */ 160 #define V_sahtree VNET(sahtree) 161 static struct mtx sahtree_lock; 162 #define SAHTREE_LOCK_INIT() \ 163 mtx_init(&sahtree_lock, "sahtree", \ 164 "fast ipsec security association database", MTX_DEF) 165 #define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 166 #define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 167 #define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 168 #define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 169 170 /* registed list */ 171 static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]); 172 #define V_regtree VNET(regtree) 173 static struct mtx regtree_lock; 174 #define REGTREE_LOCK_INIT() \ 175 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 176 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 177 #define REGTREE_LOCK() mtx_lock(®tree_lock) 178 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 179 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 180 181 static VNET_DEFINE(LIST_HEAD(_acqtree, secacq), acqtree); /* acquiring list */ 182 #define V_acqtree VNET(acqtree) 183 static struct mtx acq_lock; 184 #define ACQ_LOCK_INIT() \ 185 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 186 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 187 #define ACQ_LOCK() mtx_lock(&acq_lock) 188 #define ACQ_UNLOCK() mtx_unlock(&acq_lock) 189 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 190 191 /* SP acquiring list */ 192 static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree); 193 #define V_spacqtree VNET(spacqtree) 194 static struct mtx spacq_lock; 195 #define SPACQ_LOCK_INIT() \ 196 mtx_init(&spacq_lock, "spacqtree", \ 197 "fast ipsec security policy acquire list", MTX_DEF) 198 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 199 #define SPACQ_LOCK() mtx_lock(&spacq_lock) 200 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 201 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 202 203 /* search order for SAs */ 204 static const u_int saorder_state_valid_prefer_old[] = { 205 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 206 }; 207 static const u_int saorder_state_valid_prefer_new[] = { 208 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 209 }; 210 static const u_int saorder_state_alive[] = { 211 /* except DEAD */ 212 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 213 }; 214 static const u_int saorder_state_any[] = { 215 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 216 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 217 }; 218 219 static const int minsize[] = { 220 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 221 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 222 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 223 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 224 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 225 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 226 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 227 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 228 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 229 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 230 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 231 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 232 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 233 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 234 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 235 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 236 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 237 0, /* SADB_X_EXT_KMPRIVATE */ 238 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 239 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 240 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 241 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 242 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 243 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */ 244 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */ 245 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 246 }; 247 static const int maxsize[] = { 248 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 249 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 250 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 251 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 252 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 253 0, /* SADB_EXT_ADDRESS_SRC */ 254 0, /* SADB_EXT_ADDRESS_DST */ 255 0, /* SADB_EXT_ADDRESS_PROXY */ 256 0, /* SADB_EXT_KEY_AUTH */ 257 0, /* SADB_EXT_KEY_ENCRYPT */ 258 0, /* SADB_EXT_IDENTITY_SRC */ 259 0, /* SADB_EXT_IDENTITY_DST */ 260 0, /* SADB_EXT_SENSITIVITY */ 261 0, /* SADB_EXT_PROPOSAL */ 262 0, /* SADB_EXT_SUPPORTED_AUTH */ 263 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 264 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 265 0, /* SADB_X_EXT_KMPRIVATE */ 266 0, /* SADB_X_EXT_POLICY */ 267 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 268 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 269 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 270 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 271 0, /* SADB_X_EXT_NAT_T_OAI */ 272 0, /* SADB_X_EXT_NAT_T_OAR */ 273 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 274 }; 275 276 static VNET_DEFINE(int, ipsec_esp_keymin) = 256; 277 static VNET_DEFINE(int, ipsec_esp_auth) = 0; 278 static VNET_DEFINE(int, ipsec_ah_keymin) = 128; 279 280 #define V_ipsec_esp_keymin VNET(ipsec_esp_keymin) 281 #define V_ipsec_esp_auth VNET(ipsec_esp_auth) 282 #define V_ipsec_ah_keymin VNET(ipsec_ah_keymin) 283 284 #ifdef SYSCTL_DECL 285 SYSCTL_DECL(_net_key); 286 #endif 287 288 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, 289 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, ""); 290 291 /* max count of trial for the decision of spi value */ 292 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, 293 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, ""); 294 295 /* minimum spi value to allocate automatically. */ 296 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, 297 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, ""); 298 299 /* maximun spi value to allocate automatically. */ 300 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, 301 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, ""); 302 303 /* interval to initialize randseed */ 304 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, 305 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_int_random), 0, ""); 306 307 /* lifetime for larval SA */ 308 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, 309 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, ""); 310 311 /* counter for blocking to send SADB_ACQUIRE to IKEd */ 312 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, 313 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, ""); 314 315 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 316 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, 317 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, ""); 318 319 /* ESP auth */ 320 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, 321 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, ""); 322 323 /* minimum ESP key length */ 324 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, 325 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, ""); 326 327 /* minimum AH key length */ 328 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, 329 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, ""); 330 331 /* perfered old SA rather than new SA */ 332 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa, 333 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, ""); 334 335 #define __LIST_CHAINED(elm) \ 336 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 337 #define LIST_INSERT_TAIL(head, elm, type, field) \ 338 do {\ 339 struct type *curelm = LIST_FIRST(head); \ 340 if (curelm == NULL) {\ 341 LIST_INSERT_HEAD(head, elm, field); \ 342 } else { \ 343 while (LIST_NEXT(curelm, field)) \ 344 curelm = LIST_NEXT(curelm, field);\ 345 LIST_INSERT_AFTER(curelm, elm, field);\ 346 }\ 347 } while (0) 348 349 #define KEY_CHKSASTATE(head, sav, name) \ 350 do { \ 351 if ((head) != (sav)) { \ 352 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 353 (name), (head), (sav))); \ 354 continue; \ 355 } \ 356 } while (0) 357 358 #define KEY_CHKSPDIR(head, sp, name) \ 359 do { \ 360 if ((head) != (sp)) { \ 361 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 362 "anyway continue.\n", \ 363 (name), (head), (sp))); \ 364 } \ 365 } while (0) 366 367 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 368 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 369 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 370 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 371 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 372 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 373 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 374 375 /* 376 * set parameters into secpolicyindex buffer. 377 * Must allocate secpolicyindex buffer passed to this function. 378 */ 379 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 380 do { \ 381 bzero((idx), sizeof(struct secpolicyindex)); \ 382 (idx)->dir = (_dir); \ 383 (idx)->prefs = (ps); \ 384 (idx)->prefd = (pd); \ 385 (idx)->ul_proto = (ulp); \ 386 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 387 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 388 } while (0) 389 390 /* 391 * set parameters into secasindex buffer. 392 * Must allocate secasindex buffer before calling this function. 393 */ 394 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 395 do { \ 396 bzero((idx), sizeof(struct secasindex)); \ 397 (idx)->proto = (p); \ 398 (idx)->mode = (m); \ 399 (idx)->reqid = (r); \ 400 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 401 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 402 } while (0) 403 404 /* key statistics */ 405 struct _keystat { 406 u_long getspi_count; /* the avarage of count to try to get new SPI */ 407 } keystat; 408 409 struct sadb_msghdr { 410 struct sadb_msg *msg; 411 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 412 int extoff[SADB_EXT_MAX + 1]; 413 int extlen[SADB_EXT_MAX + 1]; 414 }; 415 416 #ifndef IPSEC_DEBUG2 417 static struct callout key_timer; 418 #endif 419 420 static struct secasvar *key_allocsa_policy(const struct secasindex *); 421 static void key_freesp_so(struct secpolicy **); 422 static struct secasvar *key_do_allocsa_policy(struct secashead *, u_int); 423 static void key_unlink(struct secpolicy *); 424 static struct secpolicy *key_getsp(struct secpolicyindex *); 425 static struct secpolicy *key_getspbyid(u_int32_t); 426 static u_int32_t key_newreqid(void); 427 static struct mbuf *key_gather_mbuf(struct mbuf *, 428 const struct sadb_msghdr *, int, int, ...); 429 static int key_spdadd(struct socket *, struct mbuf *, 430 const struct sadb_msghdr *); 431 static u_int32_t key_getnewspid(void); 432 static int key_spddelete(struct socket *, struct mbuf *, 433 const struct sadb_msghdr *); 434 static int key_spddelete2(struct socket *, struct mbuf *, 435 const struct sadb_msghdr *); 436 static int key_spdget(struct socket *, struct mbuf *, 437 const struct sadb_msghdr *); 438 static int key_spdflush(struct socket *, struct mbuf *, 439 const struct sadb_msghdr *); 440 static int key_spddump(struct socket *, struct mbuf *, 441 const struct sadb_msghdr *); 442 static struct mbuf *key_setdumpsp(struct secpolicy *, 443 u_int8_t, u_int32_t, u_int32_t); 444 static u_int key_getspreqmsglen(struct secpolicy *); 445 static int key_spdexpire(struct secpolicy *); 446 static struct secashead *key_newsah(struct secasindex *); 447 static void key_delsah(struct secashead *); 448 static struct secasvar *key_newsav(struct mbuf *, 449 const struct sadb_msghdr *, struct secashead *, int *, 450 const char*, int); 451 #define KEY_NEWSAV(m, sadb, sah, e) \ 452 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 453 static void key_delsav(struct secasvar *); 454 static struct secashead *key_getsah(struct secasindex *); 455 static struct secasvar *key_checkspidup(struct secasindex *, u_int32_t); 456 static struct secasvar *key_getsavbyspi(struct secashead *, u_int32_t); 457 static int key_setsaval(struct secasvar *, struct mbuf *, 458 const struct sadb_msghdr *); 459 static int key_mature(struct secasvar *); 460 static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t, 461 u_int8_t, u_int32_t, u_int32_t); 462 static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t, 463 u_int32_t, pid_t, u_int16_t); 464 static struct mbuf *key_setsadbsa(struct secasvar *); 465 static struct mbuf *key_setsadbaddr(u_int16_t, 466 const struct sockaddr *, u_int8_t, u_int16_t); 467 #ifdef IPSEC_NAT_T 468 static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t); 469 static struct mbuf *key_setsadbxtype(u_int16_t); 470 #endif 471 static void key_porttosaddr(struct sockaddr *, u_int16_t); 472 #define KEY_PORTTOSADDR(saddr, port) \ 473 key_porttosaddr((struct sockaddr *)(saddr), (port)) 474 static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t); 475 static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t, 476 u_int32_t); 477 static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 478 struct malloc_type *); 479 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 480 struct malloc_type *type); 481 #ifdef INET6 482 static int key_ismyaddr6(struct sockaddr_in6 *); 483 #endif 484 485 /* flags for key_cmpsaidx() */ 486 #define CMP_HEAD 1 /* protocol, addresses. */ 487 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 488 #define CMP_REQID 3 /* additionally HEAD, reaid. */ 489 #define CMP_EXACTLY 4 /* all elements. */ 490 static int key_cmpsaidx(const struct secasindex *, 491 const struct secasindex *, int); 492 static int key_cmpspidx_exactly(struct secpolicyindex *, 493 struct secpolicyindex *); 494 static int key_cmpspidx_withmask(struct secpolicyindex *, 495 struct secpolicyindex *); 496 static int key_sockaddrcmp(const struct sockaddr *, 497 const struct sockaddr *, int); 498 static int key_bbcmp(const void *, const void *, u_int); 499 static u_int16_t key_satype2proto(u_int8_t); 500 static u_int8_t key_proto2satype(u_int16_t); 501 502 static int key_getspi(struct socket *, struct mbuf *, 503 const struct sadb_msghdr *); 504 static u_int32_t key_do_getnewspi(struct sadb_spirange *, 505 struct secasindex *); 506 static int key_update(struct socket *, struct mbuf *, 507 const struct sadb_msghdr *); 508 #ifdef IPSEC_DOSEQCHECK 509 static struct secasvar *key_getsavbyseq(struct secashead *, u_int32_t); 510 #endif 511 static int key_add(struct socket *, struct mbuf *, 512 const struct sadb_msghdr *); 513 static int key_setident(struct secashead *, struct mbuf *, 514 const struct sadb_msghdr *); 515 static struct mbuf *key_getmsgbuf_x1(struct mbuf *, 516 const struct sadb_msghdr *); 517 static int key_delete(struct socket *, struct mbuf *, 518 const struct sadb_msghdr *); 519 static int key_delete_all(struct socket *, struct mbuf *, 520 const struct sadb_msghdr *, u_int16_t); 521 static int key_get(struct socket *, struct mbuf *, 522 const struct sadb_msghdr *); 523 524 static void key_getcomb_setlifetime(struct sadb_comb *); 525 static struct mbuf *key_getcomb_esp(void); 526 static struct mbuf *key_getcomb_ah(void); 527 static struct mbuf *key_getcomb_ipcomp(void); 528 static struct mbuf *key_getprop(const struct secasindex *); 529 530 static int key_acquire(const struct secasindex *, struct secpolicy *); 531 static struct secacq *key_newacq(const struct secasindex *); 532 static struct secacq *key_getacq(const struct secasindex *); 533 static struct secacq *key_getacqbyseq(u_int32_t); 534 static struct secspacq *key_newspacq(struct secpolicyindex *); 535 static struct secspacq *key_getspacq(struct secpolicyindex *); 536 static int key_acquire2(struct socket *, struct mbuf *, 537 const struct sadb_msghdr *); 538 static int key_register(struct socket *, struct mbuf *, 539 const struct sadb_msghdr *); 540 static int key_expire(struct secasvar *); 541 static int key_flush(struct socket *, struct mbuf *, 542 const struct sadb_msghdr *); 543 static int key_dump(struct socket *, struct mbuf *, 544 const struct sadb_msghdr *); 545 static int key_promisc(struct socket *, struct mbuf *, 546 const struct sadb_msghdr *); 547 static int key_senderror(struct socket *, struct mbuf *, int); 548 static int key_validate_ext(const struct sadb_ext *, int); 549 static int key_align(struct mbuf *, struct sadb_msghdr *); 550 static struct mbuf *key_setlifetime(struct seclifetime *src, 551 u_int16_t exttype); 552 static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 553 554 #if 0 555 static const char *key_getfqdn(void); 556 static const char *key_getuserfqdn(void); 557 #endif 558 static void key_sa_chgstate(struct secasvar *, u_int8_t); 559 560 static __inline void 561 sa_initref(struct secasvar *sav) 562 { 563 564 refcount_init(&sav->refcnt, 1); 565 } 566 static __inline void 567 sa_addref(struct secasvar *sav) 568 { 569 570 refcount_acquire(&sav->refcnt); 571 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 572 } 573 static __inline int 574 sa_delref(struct secasvar *sav) 575 { 576 577 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 578 return (refcount_release(&sav->refcnt)); 579 } 580 581 #define SP_ADDREF(p) refcount_acquire(&(p)->refcnt) 582 #define SP_DELREF(p) refcount_release(&(p)->refcnt) 583 584 /* 585 * Update the refcnt while holding the SPTREE lock. 586 */ 587 void 588 key_addref(struct secpolicy *sp) 589 { 590 591 SP_ADDREF(sp); 592 } 593 594 /* 595 * Return 0 when there are known to be no SP's for the specified 596 * direction. Otherwise return 1. This is used by IPsec code 597 * to optimize performance. 598 */ 599 int 600 key_havesp(u_int dir) 601 { 602 603 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 604 TAILQ_FIRST(&V_sptree[dir]) != NULL : 1); 605 } 606 607 /* %%% IPsec policy management */ 608 /* 609 * allocating a SP for OUTBOUND or INBOUND packet. 610 * Must call key_freesp() later. 611 * OUT: NULL: not found 612 * others: found and return the pointer. 613 */ 614 struct secpolicy * 615 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, 616 int tag) 617 { 618 SPTREE_RLOCK_TRACKER; 619 struct secpolicy *sp; 620 621 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 622 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 623 ("invalid direction %u", dir)); 624 625 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 626 printf("DP %s from %s:%u\n", __func__, where, tag)); 627 628 /* get a SP entry */ 629 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 630 printf("*** objects\n"); 631 kdebug_secpolicyindex(spidx)); 632 633 SPTREE_RLOCK(); 634 TAILQ_FOREACH(sp, &V_sptree[dir], chain) { 635 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 636 printf("*** in SPD\n"); 637 kdebug_secpolicyindex(&sp->spidx)); 638 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 639 goto found; 640 } 641 sp = NULL; 642 found: 643 if (sp) { 644 /* sanity check */ 645 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 646 647 /* found a SPD entry */ 648 sp->lastused = time_second; 649 SP_ADDREF(sp); 650 } 651 SPTREE_RUNLOCK(); 652 653 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 654 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 655 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 656 return sp; 657 } 658 659 /* 660 * allocating a SP for OUTBOUND or INBOUND packet. 661 * Must call key_freesp() later. 662 * OUT: NULL: not found 663 * others: found and return the pointer. 664 */ 665 struct secpolicy * 666 key_allocsp2(u_int32_t spi, union sockaddr_union *dst, u_int8_t proto, 667 u_int dir, const char* where, int tag) 668 { 669 SPTREE_RLOCK_TRACKER; 670 struct secpolicy *sp; 671 672 IPSEC_ASSERT(dst != NULL, ("null dst")); 673 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 674 ("invalid direction %u", dir)); 675 676 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 677 printf("DP %s from %s:%u\n", __func__, where, tag)); 678 679 /* get a SP entry */ 680 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 681 printf("*** objects\n"); 682 printf("spi %u proto %u dir %u\n", spi, proto, dir); 683 kdebug_sockaddr(&dst->sa)); 684 685 SPTREE_RLOCK(); 686 TAILQ_FOREACH(sp, &V_sptree[dir], chain) { 687 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 688 printf("*** in SPD\n"); 689 kdebug_secpolicyindex(&sp->spidx)); 690 /* compare simple values, then dst address */ 691 if (sp->spidx.ul_proto != proto) 692 continue; 693 /* NB: spi's must exist and match */ 694 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 695 continue; 696 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 697 goto found; 698 } 699 sp = NULL; 700 found: 701 if (sp) { 702 /* sanity check */ 703 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 704 705 /* found a SPD entry */ 706 sp->lastused = time_second; 707 SP_ADDREF(sp); 708 } 709 SPTREE_RUNLOCK(); 710 711 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 712 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 713 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 714 return sp; 715 } 716 717 #if 0 718 /* 719 * return a policy that matches this particular inbound packet. 720 * XXX slow 721 */ 722 struct secpolicy * 723 key_gettunnel(const struct sockaddr *osrc, 724 const struct sockaddr *odst, 725 const struct sockaddr *isrc, 726 const struct sockaddr *idst, 727 const char* where, int tag) 728 { 729 struct secpolicy *sp; 730 const int dir = IPSEC_DIR_INBOUND; 731 struct ipsecrequest *r1, *r2, *p; 732 struct secpolicyindex spidx; 733 734 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 735 printf("DP %s from %s:%u\n", __func__, where, tag)); 736 737 if (isrc->sa_family != idst->sa_family) { 738 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 739 __func__, isrc->sa_family, idst->sa_family)); 740 sp = NULL; 741 goto done; 742 } 743 744 SPTREE_LOCK(); 745 LIST_FOREACH(sp, &V_sptree[dir], chain) { 746 if (sp->state == IPSEC_SPSTATE_DEAD) 747 continue; 748 749 r1 = r2 = NULL; 750 for (p = sp->req; p; p = p->next) { 751 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 752 continue; 753 754 r1 = r2; 755 r2 = p; 756 757 if (!r1) { 758 /* here we look at address matches only */ 759 spidx = sp->spidx; 760 if (isrc->sa_len > sizeof(spidx.src) || 761 idst->sa_len > sizeof(spidx.dst)) 762 continue; 763 bcopy(isrc, &spidx.src, isrc->sa_len); 764 bcopy(idst, &spidx.dst, idst->sa_len); 765 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 766 continue; 767 } else { 768 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 769 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 770 continue; 771 } 772 773 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 774 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 775 continue; 776 777 goto found; 778 } 779 } 780 sp = NULL; 781 found: 782 if (sp) { 783 sp->lastused = time_second; 784 SP_ADDREF(sp); 785 } 786 SPTREE_UNLOCK(); 787 done: 788 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 789 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 790 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 791 return sp; 792 } 793 #endif 794 795 /* 796 * allocating an SA entry for an *OUTBOUND* packet. 797 * checking each request entries in SP, and acquire an SA if need. 798 * OUT: 0: there are valid requests. 799 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 800 */ 801 int 802 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 803 { 804 u_int level; 805 int error; 806 struct secasvar *sav; 807 808 IPSEC_ASSERT(isr != NULL, ("null isr")); 809 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 810 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 811 saidx->mode == IPSEC_MODE_TUNNEL, 812 ("unexpected policy %u", saidx->mode)); 813 814 /* 815 * XXX guard against protocol callbacks from the crypto 816 * thread as they reference ipsecrequest.sav which we 817 * temporarily null out below. Need to rethink how we 818 * handle bundled SA's in the callback thread. 819 */ 820 IPSECREQUEST_LOCK_ASSERT(isr); 821 822 /* get current level */ 823 level = ipsec_get_reqlevel(isr); 824 825 /* 826 * We check new SA in the IPsec request because a different 827 * SA may be involved each time this request is checked, either 828 * because new SAs are being configured, or this request is 829 * associated with an unconnected datagram socket, or this request 830 * is associated with a system default policy. 831 * 832 * key_allocsa_policy should allocate the oldest SA available. 833 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 834 */ 835 sav = key_allocsa_policy(saidx); 836 if (sav != isr->sav) { 837 /* SA need to be updated. */ 838 if (!IPSECREQUEST_UPGRADE(isr)) { 839 /* Kick everyone off. */ 840 IPSECREQUEST_UNLOCK(isr); 841 IPSECREQUEST_WLOCK(isr); 842 } 843 if (isr->sav != NULL) 844 KEY_FREESAV(&isr->sav); 845 isr->sav = sav; 846 IPSECREQUEST_DOWNGRADE(isr); 847 } else if (sav != NULL) 848 KEY_FREESAV(&sav); 849 850 /* When there is SA. */ 851 if (isr->sav != NULL) { 852 if (isr->sav->state != SADB_SASTATE_MATURE && 853 isr->sav->state != SADB_SASTATE_DYING) 854 return EINVAL; 855 return 0; 856 } 857 858 /* there is no SA */ 859 error = key_acquire(saidx, isr->sp); 860 if (error != 0) { 861 /* XXX What should I do ? */ 862 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 863 __func__, error)); 864 return error; 865 } 866 867 if (level != IPSEC_LEVEL_REQUIRE) { 868 /* XXX sigh, the interface to this routine is botched */ 869 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 870 return 0; 871 } else { 872 return ENOENT; 873 } 874 } 875 876 /* 877 * allocating a SA for policy entry from SAD. 878 * NOTE: searching SAD of aliving state. 879 * OUT: NULL: not found. 880 * others: found and return the pointer. 881 */ 882 static struct secasvar * 883 key_allocsa_policy(const struct secasindex *saidx) 884 { 885 #define N(a) _ARRAYLEN(a) 886 struct secashead *sah; 887 struct secasvar *sav; 888 u_int stateidx, arraysize; 889 const u_int *state_valid; 890 891 state_valid = NULL; /* silence gcc */ 892 arraysize = 0; /* silence gcc */ 893 894 SAHTREE_LOCK(); 895 LIST_FOREACH(sah, &V_sahtree, chain) { 896 if (sah->state == SADB_SASTATE_DEAD) 897 continue; 898 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 899 if (V_key_preferred_oldsa) { 900 state_valid = saorder_state_valid_prefer_old; 901 arraysize = N(saorder_state_valid_prefer_old); 902 } else { 903 state_valid = saorder_state_valid_prefer_new; 904 arraysize = N(saorder_state_valid_prefer_new); 905 } 906 break; 907 } 908 } 909 SAHTREE_UNLOCK(); 910 if (sah == NULL) 911 return NULL; 912 913 /* search valid state */ 914 for (stateidx = 0; stateidx < arraysize; stateidx++) { 915 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 916 if (sav != NULL) 917 return sav; 918 } 919 920 return NULL; 921 #undef N 922 } 923 924 /* 925 * searching SAD with direction, protocol, mode and state. 926 * called by key_allocsa_policy(). 927 * OUT: 928 * NULL : not found 929 * others : found, pointer to a SA. 930 */ 931 static struct secasvar * 932 key_do_allocsa_policy(struct secashead *sah, u_int state) 933 { 934 struct secasvar *sav, *nextsav, *candidate, *d; 935 936 /* initilize */ 937 candidate = NULL; 938 939 SAHTREE_LOCK(); 940 for (sav = LIST_FIRST(&sah->savtree[state]); 941 sav != NULL; 942 sav = nextsav) { 943 944 nextsav = LIST_NEXT(sav, chain); 945 946 /* sanity check */ 947 KEY_CHKSASTATE(sav->state, state, __func__); 948 949 /* initialize */ 950 if (candidate == NULL) { 951 candidate = sav; 952 continue; 953 } 954 955 /* Which SA is the better ? */ 956 957 IPSEC_ASSERT(candidate->lft_c != NULL, 958 ("null candidate lifetime")); 959 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 960 961 /* What the best method is to compare ? */ 962 if (V_key_preferred_oldsa) { 963 if (candidate->lft_c->addtime > 964 sav->lft_c->addtime) { 965 candidate = sav; 966 } 967 continue; 968 /*NOTREACHED*/ 969 } 970 971 /* preferred new sa rather than old sa */ 972 if (candidate->lft_c->addtime < 973 sav->lft_c->addtime) { 974 d = candidate; 975 candidate = sav; 976 } else 977 d = sav; 978 979 /* 980 * prepared to delete the SA when there is more 981 * suitable candidate and the lifetime of the SA is not 982 * permanent. 983 */ 984 if (d->lft_h->addtime != 0) { 985 struct mbuf *m, *result; 986 u_int8_t satype; 987 988 key_sa_chgstate(d, SADB_SASTATE_DEAD); 989 990 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 991 992 satype = key_proto2satype(d->sah->saidx.proto); 993 if (satype == 0) 994 goto msgfail; 995 996 m = key_setsadbmsg(SADB_DELETE, 0, 997 satype, 0, 0, d->refcnt - 1); 998 if (!m) 999 goto msgfail; 1000 result = m; 1001 1002 /* set sadb_address for saidx's. */ 1003 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 1004 &d->sah->saidx.src.sa, 1005 d->sah->saidx.src.sa.sa_len << 3, 1006 IPSEC_ULPROTO_ANY); 1007 if (!m) 1008 goto msgfail; 1009 m_cat(result, m); 1010 1011 /* set sadb_address for saidx's. */ 1012 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 1013 &d->sah->saidx.dst.sa, 1014 d->sah->saidx.dst.sa.sa_len << 3, 1015 IPSEC_ULPROTO_ANY); 1016 if (!m) 1017 goto msgfail; 1018 m_cat(result, m); 1019 1020 /* create SA extension */ 1021 m = key_setsadbsa(d); 1022 if (!m) 1023 goto msgfail; 1024 m_cat(result, m); 1025 1026 if (result->m_len < sizeof(struct sadb_msg)) { 1027 result = m_pullup(result, 1028 sizeof(struct sadb_msg)); 1029 if (result == NULL) 1030 goto msgfail; 1031 } 1032 1033 result->m_pkthdr.len = 0; 1034 for (m = result; m; m = m->m_next) 1035 result->m_pkthdr.len += m->m_len; 1036 mtod(result, struct sadb_msg *)->sadb_msg_len = 1037 PFKEY_UNIT64(result->m_pkthdr.len); 1038 1039 if (key_sendup_mbuf(NULL, result, 1040 KEY_SENDUP_REGISTERED)) 1041 goto msgfail; 1042 msgfail: 1043 KEY_FREESAV(&d); 1044 } 1045 } 1046 if (candidate) { 1047 sa_addref(candidate); 1048 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1049 printf("DP %s cause refcnt++:%d SA:%p\n", 1050 __func__, candidate->refcnt, candidate)); 1051 } 1052 SAHTREE_UNLOCK(); 1053 1054 return candidate; 1055 } 1056 1057 /* 1058 * allocating a usable SA entry for a *INBOUND* packet. 1059 * Must call key_freesav() later. 1060 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1061 * NULL: not found, or error occured. 1062 * 1063 * In the comparison, no source address is used--for RFC2401 conformance. 1064 * To quote, from section 4.1: 1065 * A security association is uniquely identified by a triple consisting 1066 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1067 * security protocol (AH or ESP) identifier. 1068 * Note that, however, we do need to keep source address in IPsec SA. 1069 * IKE specification and PF_KEY specification do assume that we 1070 * keep source address in IPsec SA. We see a tricky situation here. 1071 */ 1072 struct secasvar * 1073 key_allocsa(union sockaddr_union *dst, u_int proto, u_int32_t spi, 1074 const char* where, int tag) 1075 { 1076 struct secashead *sah; 1077 struct secasvar *sav; 1078 u_int stateidx, arraysize, state; 1079 const u_int *saorder_state_valid; 1080 #ifdef IPSEC_NAT_T 1081 int natt_chkport; 1082 #endif 1083 1084 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1085 1086 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1087 printf("DP %s from %s:%u\n", __func__, where, tag)); 1088 1089 #ifdef IPSEC_NAT_T 1090 natt_chkport = (dst->sa.sa_family == AF_INET && 1091 dst->sa.sa_len == sizeof(struct sockaddr_in) && 1092 dst->sin.sin_port != 0); 1093 #endif 1094 1095 /* 1096 * searching SAD. 1097 * XXX: to be checked internal IP header somewhere. Also when 1098 * IPsec tunnel packet is received. But ESP tunnel mode is 1099 * encrypted so we can't check internal IP header. 1100 */ 1101 SAHTREE_LOCK(); 1102 if (V_key_preferred_oldsa) { 1103 saorder_state_valid = saorder_state_valid_prefer_old; 1104 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1105 } else { 1106 saorder_state_valid = saorder_state_valid_prefer_new; 1107 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1108 } 1109 LIST_FOREACH(sah, &V_sahtree, chain) { 1110 int checkport; 1111 1112 /* search valid state */ 1113 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1114 state = saorder_state_valid[stateidx]; 1115 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1116 /* sanity check */ 1117 KEY_CHKSASTATE(sav->state, state, __func__); 1118 /* do not return entries w/ unusable state */ 1119 if (sav->state != SADB_SASTATE_MATURE && 1120 sav->state != SADB_SASTATE_DYING) 1121 continue; 1122 if (proto != sav->sah->saidx.proto) 1123 continue; 1124 if (spi != sav->spi) 1125 continue; 1126 checkport = 0; 1127 #ifdef IPSEC_NAT_T 1128 /* 1129 * Really only check ports when this is a NAT-T 1130 * SA. Otherwise other lookups providing ports 1131 * might suffer. 1132 */ 1133 if (sav->natt_type && natt_chkport) 1134 checkport = 1; 1135 #endif 1136 #if 0 /* don't check src */ 1137 /* check src address */ 1138 if (key_sockaddrcmp(&src->sa, 1139 &sav->sah->saidx.src.sa, checkport) != 0) 1140 continue; 1141 #endif 1142 /* check dst address */ 1143 if (key_sockaddrcmp(&dst->sa, 1144 &sav->sah->saidx.dst.sa, checkport) != 0) 1145 continue; 1146 sa_addref(sav); 1147 goto done; 1148 } 1149 } 1150 } 1151 sav = NULL; 1152 done: 1153 SAHTREE_UNLOCK(); 1154 1155 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1156 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1157 sav, sav ? sav->refcnt : 0)); 1158 return sav; 1159 } 1160 1161 /* 1162 * Must be called after calling key_allocsp(). 1163 * For both the packet without socket and key_freeso(). 1164 */ 1165 void 1166 _key_freesp(struct secpolicy **spp, const char* where, int tag) 1167 { 1168 struct ipsecrequest *isr, *nextisr; 1169 struct secpolicy *sp = *spp; 1170 1171 IPSEC_ASSERT(sp != NULL, ("null sp")); 1172 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1173 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1174 __func__, sp, sp->id, where, tag, sp->refcnt)); 1175 1176 if (SP_DELREF(sp) == 0) 1177 return; 1178 *spp = NULL; 1179 for (isr = sp->req; isr != NULL; isr = nextisr) { 1180 if (isr->sav != NULL) { 1181 KEY_FREESAV(&isr->sav); 1182 isr->sav = NULL; 1183 } 1184 nextisr = isr->next; 1185 ipsec_delisr(isr); 1186 } 1187 free(sp, M_IPSEC_SP); 1188 } 1189 1190 static void 1191 key_unlink(struct secpolicy *sp) 1192 { 1193 1194 IPSEC_ASSERT(sp != NULL, ("null sp")); 1195 IPSEC_ASSERT(sp->spidx.dir == IPSEC_DIR_INBOUND || 1196 sp->spidx.dir == IPSEC_DIR_OUTBOUND, 1197 ("invalid direction %u", sp->spidx.dir)); 1198 SPTREE_UNLOCK_ASSERT(); 1199 1200 SPTREE_WLOCK(); 1201 TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain); 1202 SPTREE_WUNLOCK(); 1203 } 1204 1205 /* 1206 * Must be called after calling key_allocsp(). 1207 * For the packet with socket. 1208 */ 1209 void 1210 key_freeso(struct socket *so) 1211 { 1212 IPSEC_ASSERT(so != NULL, ("null so")); 1213 1214 switch (so->so_proto->pr_domain->dom_family) { 1215 #if defined(INET) || defined(INET6) 1216 #ifdef INET 1217 case PF_INET: 1218 #endif 1219 #ifdef INET6 1220 case PF_INET6: 1221 #endif 1222 { 1223 struct inpcb *pcb = sotoinpcb(so); 1224 1225 /* Does it have a PCB ? */ 1226 if (pcb == NULL) 1227 return; 1228 key_freesp_so(&pcb->inp_sp->sp_in); 1229 key_freesp_so(&pcb->inp_sp->sp_out); 1230 } 1231 break; 1232 #endif /* INET || INET6 */ 1233 default: 1234 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1235 __func__, so->so_proto->pr_domain->dom_family)); 1236 return; 1237 } 1238 } 1239 1240 static void 1241 key_freesp_so(struct secpolicy **sp) 1242 { 1243 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1244 1245 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1246 (*sp)->policy == IPSEC_POLICY_BYPASS) 1247 return; 1248 1249 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1250 ("invalid policy %u", (*sp)->policy)); 1251 KEY_FREESP(sp); 1252 } 1253 1254 void 1255 key_addrefsa(struct secasvar *sav, const char* where, int tag) 1256 { 1257 1258 IPSEC_ASSERT(sav != NULL, ("null sav")); 1259 IPSEC_ASSERT(sav->refcnt > 0, ("refcount must exist")); 1260 1261 sa_addref(sav); 1262 } 1263 1264 /* 1265 * Must be called after calling key_allocsa(). 1266 * This function is called by key_freesp() to free some SA allocated 1267 * for a policy. 1268 */ 1269 void 1270 key_freesav(struct secasvar **psav, const char* where, int tag) 1271 { 1272 struct secasvar *sav = *psav; 1273 1274 IPSEC_ASSERT(sav != NULL, ("null sav")); 1275 1276 if (sa_delref(sav)) { 1277 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1278 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1279 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1280 *psav = NULL; 1281 key_delsav(sav); 1282 } else { 1283 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1284 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1285 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1286 } 1287 } 1288 1289 /* %%% SPD management */ 1290 /* 1291 * search SPD 1292 * OUT: NULL : not found 1293 * others : found, pointer to a SP. 1294 */ 1295 static struct secpolicy * 1296 key_getsp(struct secpolicyindex *spidx) 1297 { 1298 SPTREE_RLOCK_TRACKER; 1299 struct secpolicy *sp; 1300 1301 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1302 1303 SPTREE_RLOCK(); 1304 TAILQ_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1305 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1306 SP_ADDREF(sp); 1307 break; 1308 } 1309 } 1310 SPTREE_RUNLOCK(); 1311 1312 return sp; 1313 } 1314 1315 /* 1316 * get SP by index. 1317 * OUT: NULL : not found 1318 * others : found, pointer to a SP. 1319 */ 1320 static struct secpolicy * 1321 key_getspbyid(u_int32_t id) 1322 { 1323 SPTREE_RLOCK_TRACKER; 1324 struct secpolicy *sp; 1325 1326 SPTREE_RLOCK(); 1327 TAILQ_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1328 if (sp->id == id) { 1329 SP_ADDREF(sp); 1330 goto done; 1331 } 1332 } 1333 1334 TAILQ_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1335 if (sp->id == id) { 1336 SP_ADDREF(sp); 1337 goto done; 1338 } 1339 } 1340 done: 1341 SPTREE_RUNLOCK(); 1342 1343 return sp; 1344 } 1345 1346 struct secpolicy * 1347 key_newsp(const char* where, int tag) 1348 { 1349 struct secpolicy *newsp = NULL; 1350 1351 newsp = (struct secpolicy *) 1352 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1353 if (newsp) 1354 refcount_init(&newsp->refcnt, 1); 1355 1356 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1357 printf("DP %s from %s:%u return SP:%p\n", __func__, 1358 where, tag, newsp)); 1359 return newsp; 1360 } 1361 1362 /* 1363 * create secpolicy structure from sadb_x_policy structure. 1364 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1365 * so must be set properly later. 1366 */ 1367 struct secpolicy * 1368 key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error) 1369 { 1370 struct secpolicy *newsp; 1371 1372 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1373 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1374 1375 if (len != PFKEY_EXTLEN(xpl0)) { 1376 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1377 *error = EINVAL; 1378 return NULL; 1379 } 1380 1381 if ((newsp = KEY_NEWSP()) == NULL) { 1382 *error = ENOBUFS; 1383 return NULL; 1384 } 1385 1386 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1387 newsp->policy = xpl0->sadb_x_policy_type; 1388 1389 /* check policy */ 1390 switch (xpl0->sadb_x_policy_type) { 1391 case IPSEC_POLICY_DISCARD: 1392 case IPSEC_POLICY_NONE: 1393 case IPSEC_POLICY_ENTRUST: 1394 case IPSEC_POLICY_BYPASS: 1395 newsp->req = NULL; 1396 break; 1397 1398 case IPSEC_POLICY_IPSEC: 1399 { 1400 int tlen; 1401 struct sadb_x_ipsecrequest *xisr; 1402 struct ipsecrequest **p_isr = &newsp->req; 1403 1404 /* validity check */ 1405 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1406 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1407 __func__)); 1408 KEY_FREESP(&newsp); 1409 *error = EINVAL; 1410 return NULL; 1411 } 1412 1413 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1414 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1415 1416 while (tlen > 0) { 1417 /* length check */ 1418 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1419 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1420 "length.\n", __func__)); 1421 KEY_FREESP(&newsp); 1422 *error = EINVAL; 1423 return NULL; 1424 } 1425 1426 /* allocate request buffer */ 1427 /* NB: data structure is zero'd */ 1428 *p_isr = ipsec_newisr(); 1429 if ((*p_isr) == NULL) { 1430 ipseclog((LOG_DEBUG, 1431 "%s: No more memory.\n", __func__)); 1432 KEY_FREESP(&newsp); 1433 *error = ENOBUFS; 1434 return NULL; 1435 } 1436 1437 /* set values */ 1438 switch (xisr->sadb_x_ipsecrequest_proto) { 1439 case IPPROTO_ESP: 1440 case IPPROTO_AH: 1441 case IPPROTO_IPCOMP: 1442 break; 1443 default: 1444 ipseclog((LOG_DEBUG, 1445 "%s: invalid proto type=%u\n", __func__, 1446 xisr->sadb_x_ipsecrequest_proto)); 1447 KEY_FREESP(&newsp); 1448 *error = EPROTONOSUPPORT; 1449 return NULL; 1450 } 1451 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1452 1453 switch (xisr->sadb_x_ipsecrequest_mode) { 1454 case IPSEC_MODE_TRANSPORT: 1455 case IPSEC_MODE_TUNNEL: 1456 break; 1457 case IPSEC_MODE_ANY: 1458 default: 1459 ipseclog((LOG_DEBUG, 1460 "%s: invalid mode=%u\n", __func__, 1461 xisr->sadb_x_ipsecrequest_mode)); 1462 KEY_FREESP(&newsp); 1463 *error = EINVAL; 1464 return NULL; 1465 } 1466 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1467 1468 switch (xisr->sadb_x_ipsecrequest_level) { 1469 case IPSEC_LEVEL_DEFAULT: 1470 case IPSEC_LEVEL_USE: 1471 case IPSEC_LEVEL_REQUIRE: 1472 break; 1473 case IPSEC_LEVEL_UNIQUE: 1474 /* validity check */ 1475 /* 1476 * If range violation of reqid, kernel will 1477 * update it, don't refuse it. 1478 */ 1479 if (xisr->sadb_x_ipsecrequest_reqid 1480 > IPSEC_MANUAL_REQID_MAX) { 1481 ipseclog((LOG_DEBUG, 1482 "%s: reqid=%d range " 1483 "violation, updated by kernel.\n", 1484 __func__, 1485 xisr->sadb_x_ipsecrequest_reqid)); 1486 xisr->sadb_x_ipsecrequest_reqid = 0; 1487 } 1488 1489 /* allocate new reqid id if reqid is zero. */ 1490 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1491 u_int32_t reqid; 1492 if ((reqid = key_newreqid()) == 0) { 1493 KEY_FREESP(&newsp); 1494 *error = ENOBUFS; 1495 return NULL; 1496 } 1497 (*p_isr)->saidx.reqid = reqid; 1498 xisr->sadb_x_ipsecrequest_reqid = reqid; 1499 } else { 1500 /* set it for manual keying. */ 1501 (*p_isr)->saidx.reqid = 1502 xisr->sadb_x_ipsecrequest_reqid; 1503 } 1504 break; 1505 1506 default: 1507 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1508 __func__, 1509 xisr->sadb_x_ipsecrequest_level)); 1510 KEY_FREESP(&newsp); 1511 *error = EINVAL; 1512 return NULL; 1513 } 1514 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1515 1516 /* set IP addresses if there */ 1517 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1518 struct sockaddr *paddr; 1519 1520 paddr = (struct sockaddr *)(xisr + 1); 1521 1522 /* validity check */ 1523 if (paddr->sa_len 1524 > sizeof((*p_isr)->saidx.src)) { 1525 ipseclog((LOG_DEBUG, "%s: invalid " 1526 "request address length.\n", 1527 __func__)); 1528 KEY_FREESP(&newsp); 1529 *error = EINVAL; 1530 return NULL; 1531 } 1532 bcopy(paddr, &(*p_isr)->saidx.src, 1533 paddr->sa_len); 1534 1535 paddr = (struct sockaddr *)((caddr_t)paddr 1536 + paddr->sa_len); 1537 1538 /* validity check */ 1539 if (paddr->sa_len 1540 > sizeof((*p_isr)->saidx.dst)) { 1541 ipseclog((LOG_DEBUG, "%s: invalid " 1542 "request address length.\n", 1543 __func__)); 1544 KEY_FREESP(&newsp); 1545 *error = EINVAL; 1546 return NULL; 1547 } 1548 bcopy(paddr, &(*p_isr)->saidx.dst, 1549 paddr->sa_len); 1550 } 1551 1552 (*p_isr)->sp = newsp; 1553 1554 /* initialization for the next. */ 1555 p_isr = &(*p_isr)->next; 1556 tlen -= xisr->sadb_x_ipsecrequest_len; 1557 1558 /* validity check */ 1559 if (tlen < 0) { 1560 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1561 __func__)); 1562 KEY_FREESP(&newsp); 1563 *error = EINVAL; 1564 return NULL; 1565 } 1566 1567 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1568 + xisr->sadb_x_ipsecrequest_len); 1569 } 1570 } 1571 break; 1572 default: 1573 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1574 KEY_FREESP(&newsp); 1575 *error = EINVAL; 1576 return NULL; 1577 } 1578 1579 *error = 0; 1580 return newsp; 1581 } 1582 1583 static u_int32_t 1584 key_newreqid() 1585 { 1586 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1587 1588 auto_reqid = (auto_reqid == ~0 1589 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1590 1591 /* XXX should be unique check */ 1592 1593 return auto_reqid; 1594 } 1595 1596 /* 1597 * copy secpolicy struct to sadb_x_policy structure indicated. 1598 */ 1599 struct mbuf * 1600 key_sp2msg(struct secpolicy *sp) 1601 { 1602 struct sadb_x_policy *xpl; 1603 int tlen; 1604 caddr_t p; 1605 struct mbuf *m; 1606 1607 IPSEC_ASSERT(sp != NULL, ("null policy")); 1608 1609 tlen = key_getspreqmsglen(sp); 1610 1611 m = m_get2(tlen, M_NOWAIT, MT_DATA, 0); 1612 if (m == NULL) 1613 return (NULL); 1614 m_align(m, tlen); 1615 m->m_len = tlen; 1616 xpl = mtod(m, struct sadb_x_policy *); 1617 bzero(xpl, tlen); 1618 1619 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1620 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1621 xpl->sadb_x_policy_type = sp->policy; 1622 xpl->sadb_x_policy_dir = sp->spidx.dir; 1623 xpl->sadb_x_policy_id = sp->id; 1624 p = (caddr_t)xpl + sizeof(*xpl); 1625 1626 /* if is the policy for ipsec ? */ 1627 if (sp->policy == IPSEC_POLICY_IPSEC) { 1628 struct sadb_x_ipsecrequest *xisr; 1629 struct ipsecrequest *isr; 1630 1631 for (isr = sp->req; isr != NULL; isr = isr->next) { 1632 1633 xisr = (struct sadb_x_ipsecrequest *)p; 1634 1635 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1636 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1637 xisr->sadb_x_ipsecrequest_level = isr->level; 1638 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1639 1640 p += sizeof(*xisr); 1641 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1642 p += isr->saidx.src.sa.sa_len; 1643 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1644 p += isr->saidx.src.sa.sa_len; 1645 1646 xisr->sadb_x_ipsecrequest_len = 1647 PFKEY_ALIGN8(sizeof(*xisr) 1648 + isr->saidx.src.sa.sa_len 1649 + isr->saidx.dst.sa.sa_len); 1650 } 1651 } 1652 1653 return m; 1654 } 1655 1656 /* m will not be freed nor modified */ 1657 static struct mbuf * 1658 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1659 int ndeep, int nitem, ...) 1660 { 1661 va_list ap; 1662 int idx; 1663 int i; 1664 struct mbuf *result = NULL, *n; 1665 int len; 1666 1667 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1668 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1669 1670 va_start(ap, nitem); 1671 for (i = 0; i < nitem; i++) { 1672 idx = va_arg(ap, int); 1673 if (idx < 0 || idx > SADB_EXT_MAX) 1674 goto fail; 1675 /* don't attempt to pull empty extension */ 1676 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1677 continue; 1678 if (idx != SADB_EXT_RESERVED && 1679 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1680 continue; 1681 1682 if (idx == SADB_EXT_RESERVED) { 1683 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1684 1685 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1686 1687 MGETHDR(n, M_NOWAIT, MT_DATA); 1688 if (!n) 1689 goto fail; 1690 n->m_len = len; 1691 n->m_next = NULL; 1692 m_copydata(m, 0, sizeof(struct sadb_msg), 1693 mtod(n, caddr_t)); 1694 } else if (i < ndeep) { 1695 len = mhp->extlen[idx]; 1696 n = m_get2(len, M_NOWAIT, MT_DATA, 0); 1697 if (n == NULL) 1698 goto fail; 1699 m_align(n, len); 1700 n->m_len = len; 1701 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1702 mtod(n, caddr_t)); 1703 } else { 1704 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1705 M_NOWAIT); 1706 } 1707 if (n == NULL) 1708 goto fail; 1709 1710 if (result) 1711 m_cat(result, n); 1712 else 1713 result = n; 1714 } 1715 va_end(ap); 1716 1717 if ((result->m_flags & M_PKTHDR) != 0) { 1718 result->m_pkthdr.len = 0; 1719 for (n = result; n; n = n->m_next) 1720 result->m_pkthdr.len += n->m_len; 1721 } 1722 1723 return result; 1724 1725 fail: 1726 m_freem(result); 1727 va_end(ap); 1728 return NULL; 1729 } 1730 1731 /* 1732 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1733 * add an entry to SP database, when received 1734 * <base, address(SD), (lifetime(H),) policy> 1735 * from the user(?). 1736 * Adding to SP database, 1737 * and send 1738 * <base, address(SD), (lifetime(H),) policy> 1739 * to the socket which was send. 1740 * 1741 * SPDADD set a unique policy entry. 1742 * SPDSETIDX like SPDADD without a part of policy requests. 1743 * SPDUPDATE replace a unique policy entry. 1744 * 1745 * m will always be freed. 1746 */ 1747 static int 1748 key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 1749 { 1750 struct sadb_address *src0, *dst0; 1751 struct sadb_x_policy *xpl0, *xpl; 1752 struct sadb_lifetime *lft = NULL; 1753 struct secpolicyindex spidx; 1754 struct secpolicy *newsp; 1755 int error; 1756 1757 IPSEC_ASSERT(so != NULL, ("null socket")); 1758 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1759 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1760 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1761 1762 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1763 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1764 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1765 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1766 return key_senderror(so, m, EINVAL); 1767 } 1768 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1769 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1770 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1771 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1772 __func__)); 1773 return key_senderror(so, m, EINVAL); 1774 } 1775 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1776 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1777 < sizeof(struct sadb_lifetime)) { 1778 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1779 __func__)); 1780 return key_senderror(so, m, EINVAL); 1781 } 1782 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1783 } 1784 1785 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1786 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1787 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1788 1789 /* 1790 * Note: do not parse SADB_X_EXT_NAT_T_* here: 1791 * we are processing traffic endpoints. 1792 */ 1793 1794 /* make secindex */ 1795 /* XXX boundary check against sa_len */ 1796 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1797 src0 + 1, 1798 dst0 + 1, 1799 src0->sadb_address_prefixlen, 1800 dst0->sadb_address_prefixlen, 1801 src0->sadb_address_proto, 1802 &spidx); 1803 1804 /* checking the direciton. */ 1805 switch (xpl0->sadb_x_policy_dir) { 1806 case IPSEC_DIR_INBOUND: 1807 case IPSEC_DIR_OUTBOUND: 1808 break; 1809 default: 1810 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1811 mhp->msg->sadb_msg_errno = EINVAL; 1812 return 0; 1813 } 1814 1815 /* check policy */ 1816 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1817 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1818 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1819 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1820 return key_senderror(so, m, EINVAL); 1821 } 1822 1823 /* policy requests are mandatory when action is ipsec. */ 1824 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1825 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1826 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1827 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1828 __func__)); 1829 return key_senderror(so, m, EINVAL); 1830 } 1831 1832 /* 1833 * checking there is SP already or not. 1834 * SPDUPDATE doesn't depend on whether there is a SP or not. 1835 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1836 * then error. 1837 */ 1838 newsp = key_getsp(&spidx); 1839 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1840 if (newsp) { 1841 key_unlink(newsp); 1842 KEY_FREESP(&newsp); 1843 } 1844 } else { 1845 if (newsp != NULL) { 1846 KEY_FREESP(&newsp); 1847 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1848 __func__)); 1849 return key_senderror(so, m, EEXIST); 1850 } 1851 } 1852 1853 /* XXX: there is race between key_getsp and key_msg2sp. */ 1854 1855 /* allocation new SP entry */ 1856 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1857 return key_senderror(so, m, error); 1858 } 1859 1860 if ((newsp->id = key_getnewspid()) == 0) { 1861 KEY_FREESP(&newsp); 1862 return key_senderror(so, m, ENOBUFS); 1863 } 1864 1865 /* XXX boundary check against sa_len */ 1866 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1867 src0 + 1, 1868 dst0 + 1, 1869 src0->sadb_address_prefixlen, 1870 dst0->sadb_address_prefixlen, 1871 src0->sadb_address_proto, 1872 &newsp->spidx); 1873 1874 /* sanity check on addr pair */ 1875 if (((struct sockaddr *)(src0 + 1))->sa_family != 1876 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1877 KEY_FREESP(&newsp); 1878 return key_senderror(so, m, EINVAL); 1879 } 1880 if (((struct sockaddr *)(src0 + 1))->sa_len != 1881 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1882 KEY_FREESP(&newsp); 1883 return key_senderror(so, m, EINVAL); 1884 } 1885 #if 1 1886 if (newsp->req && newsp->req->saidx.src.sa.sa_family && 1887 newsp->req->saidx.dst.sa.sa_family) { 1888 if (newsp->req->saidx.src.sa.sa_family != 1889 newsp->req->saidx.dst.sa.sa_family) { 1890 KEY_FREESP(&newsp); 1891 return key_senderror(so, m, EINVAL); 1892 } 1893 } 1894 #endif 1895 1896 newsp->created = time_second; 1897 newsp->lastused = newsp->created; 1898 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1899 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1900 1901 SPTREE_WLOCK(); 1902 TAILQ_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, chain); 1903 SPTREE_WUNLOCK(); 1904 1905 /* delete the entry in spacqtree */ 1906 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1907 struct secspacq *spacq = key_getspacq(&spidx); 1908 if (spacq != NULL) { 1909 /* reset counter in order to deletion by timehandler. */ 1910 spacq->created = time_second; 1911 spacq->count = 0; 1912 SPACQ_UNLOCK(); 1913 } 1914 } 1915 1916 { 1917 struct mbuf *n, *mpolicy; 1918 struct sadb_msg *newmsg; 1919 int off; 1920 1921 /* 1922 * Note: do not send SADB_X_EXT_NAT_T_* here: 1923 * we are sending traffic endpoints. 1924 */ 1925 1926 /* create new sadb_msg to reply. */ 1927 if (lft) { 1928 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1929 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1930 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1931 } else { 1932 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1933 SADB_X_EXT_POLICY, 1934 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1935 } 1936 if (!n) 1937 return key_senderror(so, m, ENOBUFS); 1938 1939 if (n->m_len < sizeof(*newmsg)) { 1940 n = m_pullup(n, sizeof(*newmsg)); 1941 if (!n) 1942 return key_senderror(so, m, ENOBUFS); 1943 } 1944 newmsg = mtod(n, struct sadb_msg *); 1945 newmsg->sadb_msg_errno = 0; 1946 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1947 1948 off = 0; 1949 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1950 sizeof(*xpl), &off); 1951 if (mpolicy == NULL) { 1952 /* n is already freed */ 1953 return key_senderror(so, m, ENOBUFS); 1954 } 1955 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1956 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1957 m_freem(n); 1958 return key_senderror(so, m, EINVAL); 1959 } 1960 xpl->sadb_x_policy_id = newsp->id; 1961 1962 m_freem(m); 1963 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1964 } 1965 } 1966 1967 /* 1968 * get new policy id. 1969 * OUT: 1970 * 0: failure. 1971 * others: success. 1972 */ 1973 static u_int32_t 1974 key_getnewspid() 1975 { 1976 u_int32_t newid = 0; 1977 int count = V_key_spi_trycnt; /* XXX */ 1978 struct secpolicy *sp; 1979 1980 /* when requesting to allocate spi ranged */ 1981 while (count--) { 1982 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 1983 1984 if ((sp = key_getspbyid(newid)) == NULL) 1985 break; 1986 1987 KEY_FREESP(&sp); 1988 } 1989 1990 if (count == 0 || newid == 0) { 1991 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 1992 __func__)); 1993 return 0; 1994 } 1995 1996 return newid; 1997 } 1998 1999 /* 2000 * SADB_SPDDELETE processing 2001 * receive 2002 * <base, address(SD), policy(*)> 2003 * from the user(?), and set SADB_SASTATE_DEAD, 2004 * and send, 2005 * <base, address(SD), policy(*)> 2006 * to the ikmpd. 2007 * policy(*) including direction of policy. 2008 * 2009 * m will always be freed. 2010 */ 2011 static int 2012 key_spddelete(struct socket *so, struct mbuf *m, 2013 const struct sadb_msghdr *mhp) 2014 { 2015 struct sadb_address *src0, *dst0; 2016 struct sadb_x_policy *xpl0; 2017 struct secpolicyindex spidx; 2018 struct secpolicy *sp; 2019 2020 IPSEC_ASSERT(so != NULL, ("null so")); 2021 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2022 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2023 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2024 2025 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2026 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2027 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2028 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2029 __func__)); 2030 return key_senderror(so, m, EINVAL); 2031 } 2032 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2033 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2034 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2035 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2036 __func__)); 2037 return key_senderror(so, m, EINVAL); 2038 } 2039 2040 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2041 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2042 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2043 2044 /* 2045 * Note: do not parse SADB_X_EXT_NAT_T_* here: 2046 * we are processing traffic endpoints. 2047 */ 2048 2049 /* make secindex */ 2050 /* XXX boundary check against sa_len */ 2051 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2052 src0 + 1, 2053 dst0 + 1, 2054 src0->sadb_address_prefixlen, 2055 dst0->sadb_address_prefixlen, 2056 src0->sadb_address_proto, 2057 &spidx); 2058 2059 /* checking the direciton. */ 2060 switch (xpl0->sadb_x_policy_dir) { 2061 case IPSEC_DIR_INBOUND: 2062 case IPSEC_DIR_OUTBOUND: 2063 break; 2064 default: 2065 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2066 return key_senderror(so, m, EINVAL); 2067 } 2068 2069 /* Is there SP in SPD ? */ 2070 if ((sp = key_getsp(&spidx)) == NULL) { 2071 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2072 return key_senderror(so, m, EINVAL); 2073 } 2074 2075 /* save policy id to buffer to be returned. */ 2076 xpl0->sadb_x_policy_id = sp->id; 2077 2078 key_unlink(sp); 2079 KEY_FREESP(&sp); 2080 2081 { 2082 struct mbuf *n; 2083 struct sadb_msg *newmsg; 2084 2085 /* 2086 * Note: do not send SADB_X_EXT_NAT_T_* here: 2087 * we are sending traffic endpoints. 2088 */ 2089 2090 /* create new sadb_msg to reply. */ 2091 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2092 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2093 if (!n) 2094 return key_senderror(so, m, ENOBUFS); 2095 2096 newmsg = mtod(n, struct sadb_msg *); 2097 newmsg->sadb_msg_errno = 0; 2098 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2099 2100 m_freem(m); 2101 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2102 } 2103 } 2104 2105 /* 2106 * SADB_SPDDELETE2 processing 2107 * receive 2108 * <base, policy(*)> 2109 * from the user(?), and set SADB_SASTATE_DEAD, 2110 * and send, 2111 * <base, policy(*)> 2112 * to the ikmpd. 2113 * policy(*) including direction of policy. 2114 * 2115 * m will always be freed. 2116 */ 2117 static int 2118 key_spddelete2(struct socket *so, struct mbuf *m, 2119 const struct sadb_msghdr *mhp) 2120 { 2121 u_int32_t id; 2122 struct secpolicy *sp; 2123 2124 IPSEC_ASSERT(so != NULL, ("null socket")); 2125 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2126 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2127 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2128 2129 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2130 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2131 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2132 return key_senderror(so, m, EINVAL); 2133 } 2134 2135 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2136 2137 /* Is there SP in SPD ? */ 2138 if ((sp = key_getspbyid(id)) == NULL) { 2139 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2140 return key_senderror(so, m, EINVAL); 2141 } 2142 2143 key_unlink(sp); 2144 KEY_FREESP(&sp); 2145 2146 { 2147 struct mbuf *n, *nn; 2148 struct sadb_msg *newmsg; 2149 int off, len; 2150 2151 /* create new sadb_msg to reply. */ 2152 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2153 2154 MGETHDR(n, M_NOWAIT, MT_DATA); 2155 if (n && len > MHLEN) { 2156 if (!(MCLGET(n, M_NOWAIT))) { 2157 m_freem(n); 2158 n = NULL; 2159 } 2160 } 2161 if (!n) 2162 return key_senderror(so, m, ENOBUFS); 2163 2164 n->m_len = len; 2165 n->m_next = NULL; 2166 off = 0; 2167 2168 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2169 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2170 2171 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2172 off, len)); 2173 2174 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2175 mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT); 2176 if (!n->m_next) { 2177 m_freem(n); 2178 return key_senderror(so, m, ENOBUFS); 2179 } 2180 2181 n->m_pkthdr.len = 0; 2182 for (nn = n; nn; nn = nn->m_next) 2183 n->m_pkthdr.len += nn->m_len; 2184 2185 newmsg = mtod(n, struct sadb_msg *); 2186 newmsg->sadb_msg_errno = 0; 2187 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2188 2189 m_freem(m); 2190 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2191 } 2192 } 2193 2194 /* 2195 * SADB_X_GET processing 2196 * receive 2197 * <base, policy(*)> 2198 * from the user(?), 2199 * and send, 2200 * <base, address(SD), policy> 2201 * to the ikmpd. 2202 * policy(*) including direction of policy. 2203 * 2204 * m will always be freed. 2205 */ 2206 static int 2207 key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2208 { 2209 u_int32_t id; 2210 struct secpolicy *sp; 2211 struct mbuf *n; 2212 2213 IPSEC_ASSERT(so != NULL, ("null socket")); 2214 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2215 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2216 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2217 2218 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2219 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2220 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2221 __func__)); 2222 return key_senderror(so, m, EINVAL); 2223 } 2224 2225 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2226 2227 /* Is there SP in SPD ? */ 2228 if ((sp = key_getspbyid(id)) == NULL) { 2229 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2230 return key_senderror(so, m, ENOENT); 2231 } 2232 2233 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2234 KEY_FREESP(&sp); 2235 if (n != NULL) { 2236 m_freem(m); 2237 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2238 } else 2239 return key_senderror(so, m, ENOBUFS); 2240 } 2241 2242 /* 2243 * SADB_X_SPDACQUIRE processing. 2244 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2245 * send 2246 * <base, policy(*)> 2247 * to KMD, and expect to receive 2248 * <base> with SADB_X_SPDACQUIRE if error occured, 2249 * or 2250 * <base, policy> 2251 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2252 * policy(*) is without policy requests. 2253 * 2254 * 0 : succeed 2255 * others: error number 2256 */ 2257 int 2258 key_spdacquire(struct secpolicy *sp) 2259 { 2260 struct mbuf *result = NULL, *m; 2261 struct secspacq *newspacq; 2262 2263 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2264 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2265 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2266 ("policy not IPSEC %u", sp->policy)); 2267 2268 /* Get an entry to check whether sent message or not. */ 2269 newspacq = key_getspacq(&sp->spidx); 2270 if (newspacq != NULL) { 2271 if (V_key_blockacq_count < newspacq->count) { 2272 /* reset counter and do send message. */ 2273 newspacq->count = 0; 2274 } else { 2275 /* increment counter and do nothing. */ 2276 newspacq->count++; 2277 SPACQ_UNLOCK(); 2278 return (0); 2279 } 2280 SPACQ_UNLOCK(); 2281 } else { 2282 /* make new entry for blocking to send SADB_ACQUIRE. */ 2283 newspacq = key_newspacq(&sp->spidx); 2284 if (newspacq == NULL) 2285 return ENOBUFS; 2286 } 2287 2288 /* create new sadb_msg to reply. */ 2289 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2290 if (!m) 2291 return ENOBUFS; 2292 2293 result = m; 2294 2295 result->m_pkthdr.len = 0; 2296 for (m = result; m; m = m->m_next) 2297 result->m_pkthdr.len += m->m_len; 2298 2299 mtod(result, struct sadb_msg *)->sadb_msg_len = 2300 PFKEY_UNIT64(result->m_pkthdr.len); 2301 2302 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2303 } 2304 2305 /* 2306 * SADB_SPDFLUSH processing 2307 * receive 2308 * <base> 2309 * from the user, and free all entries in secpctree. 2310 * and send, 2311 * <base> 2312 * to the user. 2313 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2314 * 2315 * m will always be freed. 2316 */ 2317 static int 2318 key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2319 { 2320 TAILQ_HEAD(, secpolicy) drainq; 2321 struct sadb_msg *newmsg; 2322 struct secpolicy *sp, *nextsp; 2323 u_int dir; 2324 2325 IPSEC_ASSERT(so != NULL, ("null socket")); 2326 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2327 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2328 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2329 2330 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2331 return key_senderror(so, m, EINVAL); 2332 2333 TAILQ_INIT(&drainq); 2334 SPTREE_WLOCK(); 2335 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2336 TAILQ_CONCAT(&drainq, &V_sptree[dir], chain); 2337 } 2338 SPTREE_WUNLOCK(); 2339 sp = TAILQ_FIRST(&drainq); 2340 while (sp != NULL) { 2341 nextsp = TAILQ_NEXT(sp, chain); 2342 KEY_FREESP(&sp); 2343 sp = nextsp; 2344 } 2345 2346 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2347 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2348 return key_senderror(so, m, ENOBUFS); 2349 } 2350 2351 if (m->m_next) 2352 m_freem(m->m_next); 2353 m->m_next = NULL; 2354 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2355 newmsg = mtod(m, struct sadb_msg *); 2356 newmsg->sadb_msg_errno = 0; 2357 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2358 2359 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2360 } 2361 2362 /* 2363 * SADB_SPDDUMP processing 2364 * receive 2365 * <base> 2366 * from the user, and dump all SP leaves 2367 * and send, 2368 * <base> ..... 2369 * to the ikmpd. 2370 * 2371 * m will always be freed. 2372 */ 2373 static int 2374 key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2375 { 2376 SPTREE_RLOCK_TRACKER; 2377 struct secpolicy *sp; 2378 int cnt; 2379 u_int dir; 2380 struct mbuf *n; 2381 2382 IPSEC_ASSERT(so != NULL, ("null socket")); 2383 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2384 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2385 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2386 2387 /* search SPD entry and get buffer size. */ 2388 cnt = 0; 2389 SPTREE_RLOCK(); 2390 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2391 TAILQ_FOREACH(sp, &V_sptree[dir], chain) { 2392 cnt++; 2393 } 2394 } 2395 2396 if (cnt == 0) { 2397 SPTREE_RUNLOCK(); 2398 return key_senderror(so, m, ENOENT); 2399 } 2400 2401 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2402 TAILQ_FOREACH(sp, &V_sptree[dir], chain) { 2403 --cnt; 2404 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2405 mhp->msg->sadb_msg_pid); 2406 2407 if (n) 2408 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2409 } 2410 } 2411 2412 SPTREE_RUNLOCK(); 2413 m_freem(m); 2414 return 0; 2415 } 2416 2417 static struct mbuf * 2418 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, 2419 u_int32_t pid) 2420 { 2421 struct mbuf *result = NULL, *m; 2422 struct seclifetime lt; 2423 2424 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2425 if (!m) 2426 goto fail; 2427 result = m; 2428 2429 /* 2430 * Note: do not send SADB_X_EXT_NAT_T_* here: 2431 * we are sending traffic endpoints. 2432 */ 2433 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2434 &sp->spidx.src.sa, sp->spidx.prefs, 2435 sp->spidx.ul_proto); 2436 if (!m) 2437 goto fail; 2438 m_cat(result, m); 2439 2440 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2441 &sp->spidx.dst.sa, sp->spidx.prefd, 2442 sp->spidx.ul_proto); 2443 if (!m) 2444 goto fail; 2445 m_cat(result, m); 2446 2447 m = key_sp2msg(sp); 2448 if (!m) 2449 goto fail; 2450 m_cat(result, m); 2451 2452 if(sp->lifetime){ 2453 lt.addtime=sp->created; 2454 lt.usetime= sp->lastused; 2455 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2456 if (!m) 2457 goto fail; 2458 m_cat(result, m); 2459 2460 lt.addtime=sp->lifetime; 2461 lt.usetime= sp->validtime; 2462 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2463 if (!m) 2464 goto fail; 2465 m_cat(result, m); 2466 } 2467 2468 if ((result->m_flags & M_PKTHDR) == 0) 2469 goto fail; 2470 2471 if (result->m_len < sizeof(struct sadb_msg)) { 2472 result = m_pullup(result, sizeof(struct sadb_msg)); 2473 if (result == NULL) 2474 goto fail; 2475 } 2476 2477 result->m_pkthdr.len = 0; 2478 for (m = result; m; m = m->m_next) 2479 result->m_pkthdr.len += m->m_len; 2480 2481 mtod(result, struct sadb_msg *)->sadb_msg_len = 2482 PFKEY_UNIT64(result->m_pkthdr.len); 2483 2484 return result; 2485 2486 fail: 2487 m_freem(result); 2488 return NULL; 2489 } 2490 2491 /* 2492 * get PFKEY message length for security policy and request. 2493 */ 2494 static u_int 2495 key_getspreqmsglen(struct secpolicy *sp) 2496 { 2497 u_int tlen; 2498 2499 tlen = sizeof(struct sadb_x_policy); 2500 2501 /* if is the policy for ipsec ? */ 2502 if (sp->policy != IPSEC_POLICY_IPSEC) 2503 return tlen; 2504 2505 /* get length of ipsec requests */ 2506 { 2507 struct ipsecrequest *isr; 2508 int len; 2509 2510 for (isr = sp->req; isr != NULL; isr = isr->next) { 2511 len = sizeof(struct sadb_x_ipsecrequest) 2512 + isr->saidx.src.sa.sa_len 2513 + isr->saidx.dst.sa.sa_len; 2514 2515 tlen += PFKEY_ALIGN8(len); 2516 } 2517 } 2518 2519 return tlen; 2520 } 2521 2522 /* 2523 * SADB_SPDEXPIRE processing 2524 * send 2525 * <base, address(SD), lifetime(CH), policy> 2526 * to KMD by PF_KEY. 2527 * 2528 * OUT: 0 : succeed 2529 * others : error number 2530 */ 2531 static int 2532 key_spdexpire(struct secpolicy *sp) 2533 { 2534 struct mbuf *result = NULL, *m; 2535 int len; 2536 int error = -1; 2537 struct sadb_lifetime *lt; 2538 2539 /* XXX: Why do we lock ? */ 2540 2541 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2542 2543 /* set msg header */ 2544 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2545 if (!m) { 2546 error = ENOBUFS; 2547 goto fail; 2548 } 2549 result = m; 2550 2551 /* create lifetime extension (current and hard) */ 2552 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2553 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 2554 if (m == NULL) { 2555 error = ENOBUFS; 2556 goto fail; 2557 } 2558 m_align(m, len); 2559 m->m_len = len; 2560 bzero(mtod(m, caddr_t), len); 2561 lt = mtod(m, struct sadb_lifetime *); 2562 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2563 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2564 lt->sadb_lifetime_allocations = 0; 2565 lt->sadb_lifetime_bytes = 0; 2566 lt->sadb_lifetime_addtime = sp->created; 2567 lt->sadb_lifetime_usetime = sp->lastused; 2568 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2569 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2570 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2571 lt->sadb_lifetime_allocations = 0; 2572 lt->sadb_lifetime_bytes = 0; 2573 lt->sadb_lifetime_addtime = sp->lifetime; 2574 lt->sadb_lifetime_usetime = sp->validtime; 2575 m_cat(result, m); 2576 2577 /* 2578 * Note: do not send SADB_X_EXT_NAT_T_* here: 2579 * we are sending traffic endpoints. 2580 */ 2581 2582 /* set sadb_address for source */ 2583 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2584 &sp->spidx.src.sa, 2585 sp->spidx.prefs, sp->spidx.ul_proto); 2586 if (!m) { 2587 error = ENOBUFS; 2588 goto fail; 2589 } 2590 m_cat(result, m); 2591 2592 /* set sadb_address for destination */ 2593 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2594 &sp->spidx.dst.sa, 2595 sp->spidx.prefd, sp->spidx.ul_proto); 2596 if (!m) { 2597 error = ENOBUFS; 2598 goto fail; 2599 } 2600 m_cat(result, m); 2601 2602 /* set secpolicy */ 2603 m = key_sp2msg(sp); 2604 if (!m) { 2605 error = ENOBUFS; 2606 goto fail; 2607 } 2608 m_cat(result, m); 2609 2610 if ((result->m_flags & M_PKTHDR) == 0) { 2611 error = EINVAL; 2612 goto fail; 2613 } 2614 2615 if (result->m_len < sizeof(struct sadb_msg)) { 2616 result = m_pullup(result, sizeof(struct sadb_msg)); 2617 if (result == NULL) { 2618 error = ENOBUFS; 2619 goto fail; 2620 } 2621 } 2622 2623 result->m_pkthdr.len = 0; 2624 for (m = result; m; m = m->m_next) 2625 result->m_pkthdr.len += m->m_len; 2626 2627 mtod(result, struct sadb_msg *)->sadb_msg_len = 2628 PFKEY_UNIT64(result->m_pkthdr.len); 2629 2630 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2631 2632 fail: 2633 if (result) 2634 m_freem(result); 2635 return error; 2636 } 2637 2638 /* %%% SAD management */ 2639 /* 2640 * allocating a memory for new SA head, and copy from the values of mhp. 2641 * OUT: NULL : failure due to the lack of memory. 2642 * others : pointer to new SA head. 2643 */ 2644 static struct secashead * 2645 key_newsah(struct secasindex *saidx) 2646 { 2647 struct secashead *newsah; 2648 2649 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2650 2651 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2652 if (newsah != NULL) { 2653 int i; 2654 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2655 LIST_INIT(&newsah->savtree[i]); 2656 newsah->saidx = *saidx; 2657 2658 /* add to saidxtree */ 2659 newsah->state = SADB_SASTATE_MATURE; 2660 2661 SAHTREE_LOCK(); 2662 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2663 SAHTREE_UNLOCK(); 2664 } 2665 return(newsah); 2666 } 2667 2668 /* 2669 * delete SA index and all SA registerd. 2670 */ 2671 static void 2672 key_delsah(struct secashead *sah) 2673 { 2674 struct secasvar *sav, *nextsav; 2675 u_int stateidx; 2676 int zombie = 0; 2677 2678 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2679 SAHTREE_LOCK_ASSERT(); 2680 2681 /* searching all SA registerd in the secindex. */ 2682 for (stateidx = 0; 2683 stateidx < _ARRAYLEN(saorder_state_any); 2684 stateidx++) { 2685 u_int state = saorder_state_any[stateidx]; 2686 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2687 if (sav->refcnt == 0) { 2688 /* sanity check */ 2689 KEY_CHKSASTATE(state, sav->state, __func__); 2690 /* 2691 * do NOT call KEY_FREESAV here: 2692 * it will only delete the sav if refcnt == 1, 2693 * where we already know that refcnt == 0 2694 */ 2695 key_delsav(sav); 2696 } else { 2697 /* give up to delete this sa */ 2698 zombie++; 2699 } 2700 } 2701 } 2702 if (!zombie) { /* delete only if there are savs */ 2703 /* remove from tree of SA index */ 2704 if (__LIST_CHAINED(sah)) 2705 LIST_REMOVE(sah, chain); 2706 free(sah, M_IPSEC_SAH); 2707 } 2708 } 2709 2710 /* 2711 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2712 * and copy the values of mhp into new buffer. 2713 * When SAD message type is GETSPI: 2714 * to set sequence number from acq_seq++, 2715 * to set zero to SPI. 2716 * not to call key_setsava(). 2717 * OUT: NULL : fail 2718 * others : pointer to new secasvar. 2719 * 2720 * does not modify mbuf. does not free mbuf on error. 2721 */ 2722 static struct secasvar * 2723 key_newsav(struct mbuf *m, const struct sadb_msghdr *mhp, 2724 struct secashead *sah, int *errp, const char *where, int tag) 2725 { 2726 struct secasvar *newsav; 2727 const struct sadb_sa *xsa; 2728 2729 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2730 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2731 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2732 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2733 2734 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2735 if (newsav == NULL) { 2736 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2737 *errp = ENOBUFS; 2738 goto done; 2739 } 2740 2741 switch (mhp->msg->sadb_msg_type) { 2742 case SADB_GETSPI: 2743 newsav->spi = 0; 2744 2745 #ifdef IPSEC_DOSEQCHECK 2746 /* sync sequence number */ 2747 if (mhp->msg->sadb_msg_seq == 0) 2748 newsav->seq = 2749 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2750 else 2751 #endif 2752 newsav->seq = mhp->msg->sadb_msg_seq; 2753 break; 2754 2755 case SADB_ADD: 2756 /* sanity check */ 2757 if (mhp->ext[SADB_EXT_SA] == NULL) { 2758 free(newsav, M_IPSEC_SA); 2759 newsav = NULL; 2760 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2761 __func__)); 2762 *errp = EINVAL; 2763 goto done; 2764 } 2765 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2766 newsav->spi = xsa->sadb_sa_spi; 2767 newsav->seq = mhp->msg->sadb_msg_seq; 2768 break; 2769 default: 2770 free(newsav, M_IPSEC_SA); 2771 newsav = NULL; 2772 *errp = EINVAL; 2773 goto done; 2774 } 2775 2776 2777 /* copy sav values */ 2778 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2779 *errp = key_setsaval(newsav, m, mhp); 2780 if (*errp) { 2781 free(newsav, M_IPSEC_SA); 2782 newsav = NULL; 2783 goto done; 2784 } 2785 } 2786 2787 SECASVAR_LOCK_INIT(newsav); 2788 2789 /* reset created */ 2790 newsav->created = time_second; 2791 newsav->pid = mhp->msg->sadb_msg_pid; 2792 2793 /* add to satree */ 2794 newsav->sah = sah; 2795 sa_initref(newsav); 2796 newsav->state = SADB_SASTATE_LARVAL; 2797 2798 SAHTREE_LOCK(); 2799 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2800 secasvar, chain); 2801 SAHTREE_UNLOCK(); 2802 done: 2803 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2804 printf("DP %s from %s:%u return SP:%p\n", __func__, 2805 where, tag, newsav)); 2806 2807 return newsav; 2808 } 2809 2810 /* 2811 * free() SA variable entry. 2812 */ 2813 static void 2814 key_cleansav(struct secasvar *sav) 2815 { 2816 /* 2817 * Cleanup xform state. Note that zeroize'ing causes the 2818 * keys to be cleared; otherwise we must do it ourself. 2819 */ 2820 if (sav->tdb_xform != NULL) { 2821 sav->tdb_xform->xf_zeroize(sav); 2822 sav->tdb_xform = NULL; 2823 } else { 2824 KASSERT(sav->iv == NULL, ("iv but no xform")); 2825 if (sav->key_auth != NULL) 2826 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2827 if (sav->key_enc != NULL) 2828 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2829 } 2830 if (sav->key_auth != NULL) { 2831 if (sav->key_auth->key_data != NULL) 2832 free(sav->key_auth->key_data, M_IPSEC_MISC); 2833 free(sav->key_auth, M_IPSEC_MISC); 2834 sav->key_auth = NULL; 2835 } 2836 if (sav->key_enc != NULL) { 2837 if (sav->key_enc->key_data != NULL) 2838 free(sav->key_enc->key_data, M_IPSEC_MISC); 2839 free(sav->key_enc, M_IPSEC_MISC); 2840 sav->key_enc = NULL; 2841 } 2842 if (sav->sched) { 2843 bzero(sav->sched, sav->schedlen); 2844 free(sav->sched, M_IPSEC_MISC); 2845 sav->sched = NULL; 2846 } 2847 if (sav->replay != NULL) { 2848 free(sav->replay, M_IPSEC_MISC); 2849 sav->replay = NULL; 2850 } 2851 if (sav->lft_c != NULL) { 2852 free(sav->lft_c, M_IPSEC_MISC); 2853 sav->lft_c = NULL; 2854 } 2855 if (sav->lft_h != NULL) { 2856 free(sav->lft_h, M_IPSEC_MISC); 2857 sav->lft_h = NULL; 2858 } 2859 if (sav->lft_s != NULL) { 2860 free(sav->lft_s, M_IPSEC_MISC); 2861 sav->lft_s = NULL; 2862 } 2863 } 2864 2865 /* 2866 * free() SA variable entry. 2867 */ 2868 static void 2869 key_delsav(struct secasvar *sav) 2870 { 2871 IPSEC_ASSERT(sav != NULL, ("null sav")); 2872 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2873 2874 /* remove from SA header */ 2875 if (__LIST_CHAINED(sav)) 2876 LIST_REMOVE(sav, chain); 2877 key_cleansav(sav); 2878 SECASVAR_LOCK_DESTROY(sav); 2879 free(sav, M_IPSEC_SA); 2880 } 2881 2882 /* 2883 * search SAD. 2884 * OUT: 2885 * NULL : not found 2886 * others : found, pointer to a SA. 2887 */ 2888 static struct secashead * 2889 key_getsah(struct secasindex *saidx) 2890 { 2891 struct secashead *sah; 2892 2893 SAHTREE_LOCK(); 2894 LIST_FOREACH(sah, &V_sahtree, chain) { 2895 if (sah->state == SADB_SASTATE_DEAD) 2896 continue; 2897 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2898 break; 2899 } 2900 SAHTREE_UNLOCK(); 2901 2902 return sah; 2903 } 2904 2905 /* 2906 * check not to be duplicated SPI. 2907 * NOTE: this function is too slow due to searching all SAD. 2908 * OUT: 2909 * NULL : not found 2910 * others : found, pointer to a SA. 2911 */ 2912 static struct secasvar * 2913 key_checkspidup(struct secasindex *saidx, u_int32_t spi) 2914 { 2915 struct secashead *sah; 2916 struct secasvar *sav; 2917 2918 /* check address family */ 2919 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2920 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2921 __func__)); 2922 return NULL; 2923 } 2924 2925 sav = NULL; 2926 /* check all SAD */ 2927 SAHTREE_LOCK(); 2928 LIST_FOREACH(sah, &V_sahtree, chain) { 2929 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2930 continue; 2931 sav = key_getsavbyspi(sah, spi); 2932 if (sav != NULL) 2933 break; 2934 } 2935 SAHTREE_UNLOCK(); 2936 2937 return sav; 2938 } 2939 2940 /* 2941 * search SAD litmited alive SA, protocol, SPI. 2942 * OUT: 2943 * NULL : not found 2944 * others : found, pointer to a SA. 2945 */ 2946 static struct secasvar * 2947 key_getsavbyspi(struct secashead *sah, u_int32_t spi) 2948 { 2949 struct secasvar *sav; 2950 u_int stateidx, state; 2951 2952 sav = NULL; 2953 SAHTREE_LOCK_ASSERT(); 2954 /* search all status */ 2955 for (stateidx = 0; 2956 stateidx < _ARRAYLEN(saorder_state_alive); 2957 stateidx++) { 2958 2959 state = saorder_state_alive[stateidx]; 2960 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2961 2962 /* sanity check */ 2963 if (sav->state != state) { 2964 ipseclog((LOG_DEBUG, "%s: " 2965 "invalid sav->state (queue: %d SA: %d)\n", 2966 __func__, state, sav->state)); 2967 continue; 2968 } 2969 2970 if (sav->spi == spi) 2971 return sav; 2972 } 2973 } 2974 2975 return NULL; 2976 } 2977 2978 /* 2979 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 2980 * You must update these if need. 2981 * OUT: 0: success. 2982 * !0: failure. 2983 * 2984 * does not modify mbuf. does not free mbuf on error. 2985 */ 2986 static int 2987 key_setsaval(struct secasvar *sav, struct mbuf *m, 2988 const struct sadb_msghdr *mhp) 2989 { 2990 int error = 0; 2991 2992 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2993 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2994 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2995 2996 /* initialization */ 2997 sav->replay = NULL; 2998 sav->key_auth = NULL; 2999 sav->key_enc = NULL; 3000 sav->sched = NULL; 3001 sav->schedlen = 0; 3002 sav->iv = NULL; 3003 sav->lft_c = NULL; 3004 sav->lft_h = NULL; 3005 sav->lft_s = NULL; 3006 sav->tdb_xform = NULL; /* transform */ 3007 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3008 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3009 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3010 /* Initialize even if NAT-T not compiled in: */ 3011 sav->natt_type = 0; 3012 sav->natt_esp_frag_len = 0; 3013 3014 /* SA */ 3015 if (mhp->ext[SADB_EXT_SA] != NULL) { 3016 const struct sadb_sa *sa0; 3017 3018 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3019 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3020 error = EINVAL; 3021 goto fail; 3022 } 3023 3024 sav->alg_auth = sa0->sadb_sa_auth; 3025 sav->alg_enc = sa0->sadb_sa_encrypt; 3026 sav->flags = sa0->sadb_sa_flags; 3027 3028 /* replay window */ 3029 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3030 sav->replay = (struct secreplay *) 3031 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3032 if (sav->replay == NULL) { 3033 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3034 __func__)); 3035 error = ENOBUFS; 3036 goto fail; 3037 } 3038 if (sa0->sadb_sa_replay != 0) 3039 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3040 sav->replay->wsize = sa0->sadb_sa_replay; 3041 } 3042 } 3043 3044 /* Authentication keys */ 3045 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3046 const struct sadb_key *key0; 3047 int len; 3048 3049 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3050 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3051 3052 error = 0; 3053 if (len < sizeof(*key0)) { 3054 error = EINVAL; 3055 goto fail; 3056 } 3057 switch (mhp->msg->sadb_msg_satype) { 3058 case SADB_SATYPE_AH: 3059 case SADB_SATYPE_ESP: 3060 case SADB_X_SATYPE_TCPSIGNATURE: 3061 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3062 sav->alg_auth != SADB_X_AALG_NULL) 3063 error = EINVAL; 3064 break; 3065 case SADB_X_SATYPE_IPCOMP: 3066 default: 3067 error = EINVAL; 3068 break; 3069 } 3070 if (error) { 3071 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3072 __func__)); 3073 goto fail; 3074 } 3075 3076 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3077 M_IPSEC_MISC); 3078 if (sav->key_auth == NULL ) { 3079 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3080 __func__)); 3081 error = ENOBUFS; 3082 goto fail; 3083 } 3084 } 3085 3086 /* Encryption key */ 3087 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3088 const struct sadb_key *key0; 3089 int len; 3090 3091 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3092 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3093 3094 error = 0; 3095 if (len < sizeof(*key0)) { 3096 error = EINVAL; 3097 goto fail; 3098 } 3099 switch (mhp->msg->sadb_msg_satype) { 3100 case SADB_SATYPE_ESP: 3101 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3102 sav->alg_enc != SADB_EALG_NULL) { 3103 error = EINVAL; 3104 break; 3105 } 3106 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3107 len, 3108 M_IPSEC_MISC); 3109 if (sav->key_enc == NULL) { 3110 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3111 __func__)); 3112 error = ENOBUFS; 3113 goto fail; 3114 } 3115 break; 3116 case SADB_X_SATYPE_IPCOMP: 3117 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3118 error = EINVAL; 3119 sav->key_enc = NULL; /*just in case*/ 3120 break; 3121 case SADB_SATYPE_AH: 3122 case SADB_X_SATYPE_TCPSIGNATURE: 3123 default: 3124 error = EINVAL; 3125 break; 3126 } 3127 if (error) { 3128 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3129 __func__)); 3130 goto fail; 3131 } 3132 } 3133 3134 /* set iv */ 3135 sav->ivlen = 0; 3136 3137 switch (mhp->msg->sadb_msg_satype) { 3138 case SADB_SATYPE_AH: 3139 error = xform_init(sav, XF_AH); 3140 break; 3141 case SADB_SATYPE_ESP: 3142 error = xform_init(sav, XF_ESP); 3143 break; 3144 case SADB_X_SATYPE_IPCOMP: 3145 error = xform_init(sav, XF_IPCOMP); 3146 break; 3147 case SADB_X_SATYPE_TCPSIGNATURE: 3148 error = xform_init(sav, XF_TCPSIGNATURE); 3149 break; 3150 } 3151 if (error) { 3152 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3153 __func__, mhp->msg->sadb_msg_satype)); 3154 goto fail; 3155 } 3156 3157 /* reset created */ 3158 sav->created = time_second; 3159 3160 /* make lifetime for CURRENT */ 3161 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3162 if (sav->lft_c == NULL) { 3163 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3164 error = ENOBUFS; 3165 goto fail; 3166 } 3167 3168 sav->lft_c->allocations = 0; 3169 sav->lft_c->bytes = 0; 3170 sav->lft_c->addtime = time_second; 3171 sav->lft_c->usetime = 0; 3172 3173 /* lifetimes for HARD and SOFT */ 3174 { 3175 const struct sadb_lifetime *lft0; 3176 3177 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3178 if (lft0 != NULL) { 3179 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3180 error = EINVAL; 3181 goto fail; 3182 } 3183 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3184 if (sav->lft_h == NULL) { 3185 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3186 error = ENOBUFS; 3187 goto fail; 3188 } 3189 /* to be initialize ? */ 3190 } 3191 3192 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3193 if (lft0 != NULL) { 3194 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3195 error = EINVAL; 3196 goto fail; 3197 } 3198 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3199 if (sav->lft_s == NULL) { 3200 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3201 error = ENOBUFS; 3202 goto fail; 3203 } 3204 /* to be initialize ? */ 3205 } 3206 } 3207 3208 return 0; 3209 3210 fail: 3211 /* initialization */ 3212 key_cleansav(sav); 3213 3214 return error; 3215 } 3216 3217 /* 3218 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3219 * OUT: 0: valid 3220 * other: errno 3221 */ 3222 static int 3223 key_mature(struct secasvar *sav) 3224 { 3225 int error; 3226 3227 /* check SPI value */ 3228 switch (sav->sah->saidx.proto) { 3229 case IPPROTO_ESP: 3230 case IPPROTO_AH: 3231 /* 3232 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3233 * 1-255 reserved by IANA for future use, 3234 * 0 for implementation specific, local use. 3235 */ 3236 if (ntohl(sav->spi) <= 255) { 3237 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3238 __func__, (u_int32_t)ntohl(sav->spi))); 3239 return EINVAL; 3240 } 3241 break; 3242 } 3243 3244 /* check satype */ 3245 switch (sav->sah->saidx.proto) { 3246 case IPPROTO_ESP: 3247 /* check flags */ 3248 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3249 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3250 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3251 "given to old-esp.\n", __func__)); 3252 return EINVAL; 3253 } 3254 error = xform_init(sav, XF_ESP); 3255 break; 3256 case IPPROTO_AH: 3257 /* check flags */ 3258 if (sav->flags & SADB_X_EXT_DERIV) { 3259 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3260 "given to AH SA.\n", __func__)); 3261 return EINVAL; 3262 } 3263 if (sav->alg_enc != SADB_EALG_NONE) { 3264 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3265 "mismated.\n", __func__)); 3266 return(EINVAL); 3267 } 3268 error = xform_init(sav, XF_AH); 3269 break; 3270 case IPPROTO_IPCOMP: 3271 if (sav->alg_auth != SADB_AALG_NONE) { 3272 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3273 "mismated.\n", __func__)); 3274 return(EINVAL); 3275 } 3276 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3277 && ntohl(sav->spi) >= 0x10000) { 3278 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3279 __func__)); 3280 return(EINVAL); 3281 } 3282 error = xform_init(sav, XF_IPCOMP); 3283 break; 3284 case IPPROTO_TCP: 3285 if (sav->alg_enc != SADB_EALG_NONE) { 3286 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3287 "mismated.\n", __func__)); 3288 return(EINVAL); 3289 } 3290 error = xform_init(sav, XF_TCPSIGNATURE); 3291 break; 3292 default: 3293 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3294 error = EPROTONOSUPPORT; 3295 break; 3296 } 3297 if (error == 0) { 3298 SAHTREE_LOCK(); 3299 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3300 SAHTREE_UNLOCK(); 3301 } 3302 return (error); 3303 } 3304 3305 /* 3306 * subroutine for SADB_GET and SADB_DUMP. 3307 */ 3308 static struct mbuf * 3309 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3310 u_int32_t seq, u_int32_t pid) 3311 { 3312 struct mbuf *result = NULL, *tres = NULL, *m; 3313 int i; 3314 int dumporder[] = { 3315 SADB_EXT_SA, SADB_X_EXT_SA2, 3316 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3317 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3318 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3319 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3320 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3321 #ifdef IPSEC_NAT_T 3322 SADB_X_EXT_NAT_T_TYPE, 3323 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3324 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3325 SADB_X_EXT_NAT_T_FRAG, 3326 #endif 3327 }; 3328 3329 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3330 if (m == NULL) 3331 goto fail; 3332 result = m; 3333 3334 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3335 m = NULL; 3336 switch (dumporder[i]) { 3337 case SADB_EXT_SA: 3338 m = key_setsadbsa(sav); 3339 if (!m) 3340 goto fail; 3341 break; 3342 3343 case SADB_X_EXT_SA2: 3344 m = key_setsadbxsa2(sav->sah->saidx.mode, 3345 sav->replay ? sav->replay->count : 0, 3346 sav->sah->saidx.reqid); 3347 if (!m) 3348 goto fail; 3349 break; 3350 3351 case SADB_EXT_ADDRESS_SRC: 3352 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3353 &sav->sah->saidx.src.sa, 3354 FULLMASK, IPSEC_ULPROTO_ANY); 3355 if (!m) 3356 goto fail; 3357 break; 3358 3359 case SADB_EXT_ADDRESS_DST: 3360 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3361 &sav->sah->saidx.dst.sa, 3362 FULLMASK, IPSEC_ULPROTO_ANY); 3363 if (!m) 3364 goto fail; 3365 break; 3366 3367 case SADB_EXT_KEY_AUTH: 3368 if (!sav->key_auth) 3369 continue; 3370 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3371 if (!m) 3372 goto fail; 3373 break; 3374 3375 case SADB_EXT_KEY_ENCRYPT: 3376 if (!sav->key_enc) 3377 continue; 3378 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3379 if (!m) 3380 goto fail; 3381 break; 3382 3383 case SADB_EXT_LIFETIME_CURRENT: 3384 if (!sav->lft_c) 3385 continue; 3386 m = key_setlifetime(sav->lft_c, 3387 SADB_EXT_LIFETIME_CURRENT); 3388 if (!m) 3389 goto fail; 3390 break; 3391 3392 case SADB_EXT_LIFETIME_HARD: 3393 if (!sav->lft_h) 3394 continue; 3395 m = key_setlifetime(sav->lft_h, 3396 SADB_EXT_LIFETIME_HARD); 3397 if (!m) 3398 goto fail; 3399 break; 3400 3401 case SADB_EXT_LIFETIME_SOFT: 3402 if (!sav->lft_s) 3403 continue; 3404 m = key_setlifetime(sav->lft_s, 3405 SADB_EXT_LIFETIME_SOFT); 3406 3407 if (!m) 3408 goto fail; 3409 break; 3410 3411 #ifdef IPSEC_NAT_T 3412 case SADB_X_EXT_NAT_T_TYPE: 3413 m = key_setsadbxtype(sav->natt_type); 3414 if (!m) 3415 goto fail; 3416 break; 3417 3418 case SADB_X_EXT_NAT_T_DPORT: 3419 m = key_setsadbxport( 3420 KEY_PORTFROMSADDR(&sav->sah->saidx.dst), 3421 SADB_X_EXT_NAT_T_DPORT); 3422 if (!m) 3423 goto fail; 3424 break; 3425 3426 case SADB_X_EXT_NAT_T_SPORT: 3427 m = key_setsadbxport( 3428 KEY_PORTFROMSADDR(&sav->sah->saidx.src), 3429 SADB_X_EXT_NAT_T_SPORT); 3430 if (!m) 3431 goto fail; 3432 break; 3433 3434 case SADB_X_EXT_NAT_T_OAI: 3435 case SADB_X_EXT_NAT_T_OAR: 3436 case SADB_X_EXT_NAT_T_FRAG: 3437 /* We do not (yet) support those. */ 3438 continue; 3439 #endif 3440 3441 case SADB_EXT_ADDRESS_PROXY: 3442 case SADB_EXT_IDENTITY_SRC: 3443 case SADB_EXT_IDENTITY_DST: 3444 /* XXX: should we brought from SPD ? */ 3445 case SADB_EXT_SENSITIVITY: 3446 default: 3447 continue; 3448 } 3449 3450 if (!m) 3451 goto fail; 3452 if (tres) 3453 m_cat(m, tres); 3454 tres = m; 3455 3456 } 3457 3458 m_cat(result, tres); 3459 if (result->m_len < sizeof(struct sadb_msg)) { 3460 result = m_pullup(result, sizeof(struct sadb_msg)); 3461 if (result == NULL) 3462 goto fail; 3463 } 3464 3465 result->m_pkthdr.len = 0; 3466 for (m = result; m; m = m->m_next) 3467 result->m_pkthdr.len += m->m_len; 3468 3469 mtod(result, struct sadb_msg *)->sadb_msg_len = 3470 PFKEY_UNIT64(result->m_pkthdr.len); 3471 3472 return result; 3473 3474 fail: 3475 m_freem(result); 3476 m_freem(tres); 3477 return NULL; 3478 } 3479 3480 /* 3481 * set data into sadb_msg. 3482 */ 3483 static struct mbuf * 3484 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3485 pid_t pid, u_int16_t reserved) 3486 { 3487 struct mbuf *m; 3488 struct sadb_msg *p; 3489 int len; 3490 3491 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3492 if (len > MCLBYTES) 3493 return NULL; 3494 MGETHDR(m, M_NOWAIT, MT_DATA); 3495 if (m && len > MHLEN) { 3496 if (!(MCLGET(m, M_NOWAIT))) { 3497 m_freem(m); 3498 m = NULL; 3499 } 3500 } 3501 if (!m) 3502 return NULL; 3503 m->m_pkthdr.len = m->m_len = len; 3504 m->m_next = NULL; 3505 3506 p = mtod(m, struct sadb_msg *); 3507 3508 bzero(p, len); 3509 p->sadb_msg_version = PF_KEY_V2; 3510 p->sadb_msg_type = type; 3511 p->sadb_msg_errno = 0; 3512 p->sadb_msg_satype = satype; 3513 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3514 p->sadb_msg_reserved = reserved; 3515 p->sadb_msg_seq = seq; 3516 p->sadb_msg_pid = (u_int32_t)pid; 3517 3518 return m; 3519 } 3520 3521 /* 3522 * copy secasvar data into sadb_address. 3523 */ 3524 static struct mbuf * 3525 key_setsadbsa(struct secasvar *sav) 3526 { 3527 struct mbuf *m; 3528 struct sadb_sa *p; 3529 int len; 3530 3531 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3532 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3533 if (m == NULL) 3534 return (NULL); 3535 m_align(m, len); 3536 m->m_len = len; 3537 p = mtod(m, struct sadb_sa *); 3538 bzero(p, len); 3539 p->sadb_sa_len = PFKEY_UNIT64(len); 3540 p->sadb_sa_exttype = SADB_EXT_SA; 3541 p->sadb_sa_spi = sav->spi; 3542 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3543 p->sadb_sa_state = sav->state; 3544 p->sadb_sa_auth = sav->alg_auth; 3545 p->sadb_sa_encrypt = sav->alg_enc; 3546 p->sadb_sa_flags = sav->flags; 3547 3548 return m; 3549 } 3550 3551 /* 3552 * set data into sadb_address. 3553 */ 3554 static struct mbuf * 3555 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, 3556 u_int8_t prefixlen, u_int16_t ul_proto) 3557 { 3558 struct mbuf *m; 3559 struct sadb_address *p; 3560 size_t len; 3561 3562 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3563 PFKEY_ALIGN8(saddr->sa_len); 3564 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3565 if (m == NULL) 3566 return (NULL); 3567 m_align(m, len); 3568 m->m_len = len; 3569 p = mtod(m, struct sadb_address *); 3570 3571 bzero(p, len); 3572 p->sadb_address_len = PFKEY_UNIT64(len); 3573 p->sadb_address_exttype = exttype; 3574 p->sadb_address_proto = ul_proto; 3575 if (prefixlen == FULLMASK) { 3576 switch (saddr->sa_family) { 3577 case AF_INET: 3578 prefixlen = sizeof(struct in_addr) << 3; 3579 break; 3580 case AF_INET6: 3581 prefixlen = sizeof(struct in6_addr) << 3; 3582 break; 3583 default: 3584 ; /*XXX*/ 3585 } 3586 } 3587 p->sadb_address_prefixlen = prefixlen; 3588 p->sadb_address_reserved = 0; 3589 3590 bcopy(saddr, 3591 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3592 saddr->sa_len); 3593 3594 return m; 3595 } 3596 3597 /* 3598 * set data into sadb_x_sa2. 3599 */ 3600 static struct mbuf * 3601 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3602 { 3603 struct mbuf *m; 3604 struct sadb_x_sa2 *p; 3605 size_t len; 3606 3607 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3608 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3609 if (m == NULL) 3610 return (NULL); 3611 m_align(m, len); 3612 m->m_len = len; 3613 p = mtod(m, struct sadb_x_sa2 *); 3614 3615 bzero(p, len); 3616 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3617 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3618 p->sadb_x_sa2_mode = mode; 3619 p->sadb_x_sa2_reserved1 = 0; 3620 p->sadb_x_sa2_reserved2 = 0; 3621 p->sadb_x_sa2_sequence = seq; 3622 p->sadb_x_sa2_reqid = reqid; 3623 3624 return m; 3625 } 3626 3627 #ifdef IPSEC_NAT_T 3628 /* 3629 * Set a type in sadb_x_nat_t_type. 3630 */ 3631 static struct mbuf * 3632 key_setsadbxtype(u_int16_t type) 3633 { 3634 struct mbuf *m; 3635 size_t len; 3636 struct sadb_x_nat_t_type *p; 3637 3638 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3639 3640 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3641 if (m == NULL) 3642 return (NULL); 3643 m_align(m, len); 3644 m->m_len = len; 3645 p = mtod(m, struct sadb_x_nat_t_type *); 3646 3647 bzero(p, len); 3648 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3649 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3650 p->sadb_x_nat_t_type_type = type; 3651 3652 return (m); 3653 } 3654 /* 3655 * Set a port in sadb_x_nat_t_port. 3656 * In contrast to default RFC 2367 behaviour, port is in network byte order. 3657 */ 3658 static struct mbuf * 3659 key_setsadbxport(u_int16_t port, u_int16_t type) 3660 { 3661 struct mbuf *m; 3662 size_t len; 3663 struct sadb_x_nat_t_port *p; 3664 3665 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3666 3667 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3668 if (m == NULL) 3669 return (NULL); 3670 m_align(m, len); 3671 m->m_len = len; 3672 p = mtod(m, struct sadb_x_nat_t_port *); 3673 3674 bzero(p, len); 3675 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3676 p->sadb_x_nat_t_port_exttype = type; 3677 p->sadb_x_nat_t_port_port = port; 3678 3679 return (m); 3680 } 3681 3682 /* 3683 * Get port from sockaddr. Port is in network byte order. 3684 */ 3685 u_int16_t 3686 key_portfromsaddr(struct sockaddr *sa) 3687 { 3688 3689 switch (sa->sa_family) { 3690 #ifdef INET 3691 case AF_INET: 3692 return ((struct sockaddr_in *)sa)->sin_port; 3693 #endif 3694 #ifdef INET6 3695 case AF_INET6: 3696 return ((struct sockaddr_in6 *)sa)->sin6_port; 3697 #endif 3698 } 3699 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 3700 printf("DP %s unexpected address family %d\n", 3701 __func__, sa->sa_family)); 3702 return (0); 3703 } 3704 #endif /* IPSEC_NAT_T */ 3705 3706 /* 3707 * Set port in struct sockaddr. Port is in network byte order. 3708 */ 3709 static void 3710 key_porttosaddr(struct sockaddr *sa, u_int16_t port) 3711 { 3712 3713 switch (sa->sa_family) { 3714 #ifdef INET 3715 case AF_INET: 3716 ((struct sockaddr_in *)sa)->sin_port = port; 3717 break; 3718 #endif 3719 #ifdef INET6 3720 case AF_INET6: 3721 ((struct sockaddr_in6 *)sa)->sin6_port = port; 3722 break; 3723 #endif 3724 default: 3725 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n", 3726 __func__, sa->sa_family)); 3727 break; 3728 } 3729 } 3730 3731 /* 3732 * set data into sadb_x_policy 3733 */ 3734 static struct mbuf * 3735 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3736 { 3737 struct mbuf *m; 3738 struct sadb_x_policy *p; 3739 size_t len; 3740 3741 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3742 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3743 if (m == NULL) 3744 return (NULL); 3745 m_align(m, len); 3746 m->m_len = len; 3747 p = mtod(m, struct sadb_x_policy *); 3748 3749 bzero(p, len); 3750 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3751 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3752 p->sadb_x_policy_type = type; 3753 p->sadb_x_policy_dir = dir; 3754 p->sadb_x_policy_id = id; 3755 3756 return m; 3757 } 3758 3759 /* %%% utilities */ 3760 /* Take a key message (sadb_key) from the socket and turn it into one 3761 * of the kernel's key structures (seckey). 3762 * 3763 * IN: pointer to the src 3764 * OUT: NULL no more memory 3765 */ 3766 struct seckey * 3767 key_dup_keymsg(const struct sadb_key *src, u_int len, 3768 struct malloc_type *type) 3769 { 3770 struct seckey *dst; 3771 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3772 if (dst != NULL) { 3773 dst->bits = src->sadb_key_bits; 3774 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3775 if (dst->key_data != NULL) { 3776 bcopy((const char *)src + sizeof(struct sadb_key), 3777 dst->key_data, len); 3778 } else { 3779 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3780 __func__)); 3781 free(dst, type); 3782 dst = NULL; 3783 } 3784 } else { 3785 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3786 __func__)); 3787 3788 } 3789 return dst; 3790 } 3791 3792 /* Take a lifetime message (sadb_lifetime) passed in on a socket and 3793 * turn it into one of the kernel's lifetime structures (seclifetime). 3794 * 3795 * IN: pointer to the destination, source and malloc type 3796 * OUT: NULL, no more memory 3797 */ 3798 3799 static struct seclifetime * 3800 key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type) 3801 { 3802 struct seclifetime *dst = NULL; 3803 3804 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3805 type, M_NOWAIT); 3806 if (dst == NULL) { 3807 /* XXX counter */ 3808 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3809 } else { 3810 dst->allocations = src->sadb_lifetime_allocations; 3811 dst->bytes = src->sadb_lifetime_bytes; 3812 dst->addtime = src->sadb_lifetime_addtime; 3813 dst->usetime = src->sadb_lifetime_usetime; 3814 } 3815 return dst; 3816 } 3817 3818 /* compare my own address 3819 * OUT: 1: true, i.e. my address. 3820 * 0: false 3821 */ 3822 int 3823 key_ismyaddr(struct sockaddr *sa) 3824 { 3825 3826 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3827 switch (sa->sa_family) { 3828 #ifdef INET 3829 case AF_INET: 3830 return (in_localip(satosin(sa)->sin_addr)); 3831 #endif 3832 #ifdef INET6 3833 case AF_INET6: 3834 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3835 #endif 3836 } 3837 3838 return 0; 3839 } 3840 3841 #ifdef INET6 3842 /* 3843 * compare my own address for IPv6. 3844 * 1: ours 3845 * 0: other 3846 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3847 */ 3848 #include <netinet6/in6_var.h> 3849 3850 static int 3851 key_ismyaddr6(struct sockaddr_in6 *sin6) 3852 { 3853 struct in6_ifaddr *ia; 3854 #if 0 3855 struct in6_multi *in6m; 3856 #endif 3857 3858 IN6_IFADDR_RLOCK(); 3859 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 3860 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3861 (struct sockaddr *)&ia->ia_addr, 0) == 0) { 3862 IN6_IFADDR_RUNLOCK(); 3863 return 1; 3864 } 3865 3866 #if 0 3867 /* 3868 * XXX Multicast 3869 * XXX why do we care about multlicast here while we don't care 3870 * about IPv4 multicast?? 3871 * XXX scope 3872 */ 3873 in6m = NULL; 3874 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3875 if (in6m) { 3876 IN6_IFADDR_RUNLOCK(); 3877 return 1; 3878 } 3879 #endif 3880 } 3881 IN6_IFADDR_RUNLOCK(); 3882 3883 /* loopback, just for safety */ 3884 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3885 return 1; 3886 3887 return 0; 3888 } 3889 #endif /*INET6*/ 3890 3891 /* 3892 * compare two secasindex structure. 3893 * flag can specify to compare 2 saidxes. 3894 * compare two secasindex structure without both mode and reqid. 3895 * don't compare port. 3896 * IN: 3897 * saidx0: source, it can be in SAD. 3898 * saidx1: object. 3899 * OUT: 3900 * 1 : equal 3901 * 0 : not equal 3902 */ 3903 static int 3904 key_cmpsaidx(const struct secasindex *saidx0, const struct secasindex *saidx1, 3905 int flag) 3906 { 3907 int chkport = 0; 3908 3909 /* sanity */ 3910 if (saidx0 == NULL && saidx1 == NULL) 3911 return 1; 3912 3913 if (saidx0 == NULL || saidx1 == NULL) 3914 return 0; 3915 3916 if (saidx0->proto != saidx1->proto) 3917 return 0; 3918 3919 if (flag == CMP_EXACTLY) { 3920 if (saidx0->mode != saidx1->mode) 3921 return 0; 3922 if (saidx0->reqid != saidx1->reqid) 3923 return 0; 3924 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3925 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3926 return 0; 3927 } else { 3928 3929 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3930 if (flag == CMP_MODE_REQID 3931 ||flag == CMP_REQID) { 3932 /* 3933 * If reqid of SPD is non-zero, unique SA is required. 3934 * The result must be of same reqid in this case. 3935 */ 3936 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3937 return 0; 3938 } 3939 3940 if (flag == CMP_MODE_REQID) { 3941 if (saidx0->mode != IPSEC_MODE_ANY 3942 && saidx0->mode != saidx1->mode) 3943 return 0; 3944 } 3945 3946 #ifdef IPSEC_NAT_T 3947 /* 3948 * If NAT-T is enabled, check ports for tunnel mode. 3949 * Do not check ports if they are set to zero in the SPD. 3950 * Also do not do it for native transport mode, as there 3951 * is no port information available in the SP. 3952 */ 3953 if ((saidx1->mode == IPSEC_MODE_TUNNEL || 3954 (saidx1->mode == IPSEC_MODE_TRANSPORT && 3955 saidx1->proto == IPPROTO_ESP)) && 3956 saidx1->src.sa.sa_family == AF_INET && 3957 saidx1->dst.sa.sa_family == AF_INET && 3958 ((const struct sockaddr_in *)(&saidx1->src))->sin_port && 3959 ((const struct sockaddr_in *)(&saidx1->dst))->sin_port) 3960 chkport = 1; 3961 #endif /* IPSEC_NAT_T */ 3962 3963 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { 3964 return 0; 3965 } 3966 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { 3967 return 0; 3968 } 3969 } 3970 3971 return 1; 3972 } 3973 3974 /* 3975 * compare two secindex structure exactly. 3976 * IN: 3977 * spidx0: source, it is often in SPD. 3978 * spidx1: object, it is often from PFKEY message. 3979 * OUT: 3980 * 1 : equal 3981 * 0 : not equal 3982 */ 3983 static int 3984 key_cmpspidx_exactly(struct secpolicyindex *spidx0, 3985 struct secpolicyindex *spidx1) 3986 { 3987 /* sanity */ 3988 if (spidx0 == NULL && spidx1 == NULL) 3989 return 1; 3990 3991 if (spidx0 == NULL || spidx1 == NULL) 3992 return 0; 3993 3994 if (spidx0->prefs != spidx1->prefs 3995 || spidx0->prefd != spidx1->prefd 3996 || spidx0->ul_proto != spidx1->ul_proto) 3997 return 0; 3998 3999 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 4000 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 4001 } 4002 4003 /* 4004 * compare two secindex structure with mask. 4005 * IN: 4006 * spidx0: source, it is often in SPD. 4007 * spidx1: object, it is often from IP header. 4008 * OUT: 4009 * 1 : equal 4010 * 0 : not equal 4011 */ 4012 static int 4013 key_cmpspidx_withmask(struct secpolicyindex *spidx0, 4014 struct secpolicyindex *spidx1) 4015 { 4016 /* sanity */ 4017 if (spidx0 == NULL && spidx1 == NULL) 4018 return 1; 4019 4020 if (spidx0 == NULL || spidx1 == NULL) 4021 return 0; 4022 4023 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4024 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4025 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4026 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4027 return 0; 4028 4029 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4030 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 4031 && spidx0->ul_proto != spidx1->ul_proto) 4032 return 0; 4033 4034 switch (spidx0->src.sa.sa_family) { 4035 case AF_INET: 4036 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 4037 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4038 return 0; 4039 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 4040 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4041 return 0; 4042 break; 4043 case AF_INET6: 4044 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 4045 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4046 return 0; 4047 /* 4048 * scope_id check. if sin6_scope_id is 0, we regard it 4049 * as a wildcard scope, which matches any scope zone ID. 4050 */ 4051 if (spidx0->src.sin6.sin6_scope_id && 4052 spidx1->src.sin6.sin6_scope_id && 4053 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4054 return 0; 4055 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 4056 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4057 return 0; 4058 break; 4059 default: 4060 /* XXX */ 4061 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4062 return 0; 4063 break; 4064 } 4065 4066 switch (spidx0->dst.sa.sa_family) { 4067 case AF_INET: 4068 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 4069 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4070 return 0; 4071 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 4072 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4073 return 0; 4074 break; 4075 case AF_INET6: 4076 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 4077 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4078 return 0; 4079 /* 4080 * scope_id check. if sin6_scope_id is 0, we regard it 4081 * as a wildcard scope, which matches any scope zone ID. 4082 */ 4083 if (spidx0->dst.sin6.sin6_scope_id && 4084 spidx1->dst.sin6.sin6_scope_id && 4085 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4086 return 0; 4087 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 4088 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4089 return 0; 4090 break; 4091 default: 4092 /* XXX */ 4093 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4094 return 0; 4095 break; 4096 } 4097 4098 /* XXX Do we check other field ? e.g. flowinfo */ 4099 4100 return 1; 4101 } 4102 4103 /* returns 0 on match */ 4104 static int 4105 key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2, 4106 int port) 4107 { 4108 #ifdef satosin 4109 #undef satosin 4110 #endif 4111 #define satosin(s) ((const struct sockaddr_in *)s) 4112 #ifdef satosin6 4113 #undef satosin6 4114 #endif 4115 #define satosin6(s) ((const struct sockaddr_in6 *)s) 4116 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4117 return 1; 4118 4119 switch (sa1->sa_family) { 4120 case AF_INET: 4121 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4122 return 1; 4123 if (satosin(sa1)->sin_addr.s_addr != 4124 satosin(sa2)->sin_addr.s_addr) { 4125 return 1; 4126 } 4127 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4128 return 1; 4129 break; 4130 case AF_INET6: 4131 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4132 return 1; /*EINVAL*/ 4133 if (satosin6(sa1)->sin6_scope_id != 4134 satosin6(sa2)->sin6_scope_id) { 4135 return 1; 4136 } 4137 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4138 &satosin6(sa2)->sin6_addr)) { 4139 return 1; 4140 } 4141 if (port && 4142 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4143 return 1; 4144 } 4145 break; 4146 default: 4147 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4148 return 1; 4149 break; 4150 } 4151 4152 return 0; 4153 #undef satosin 4154 #undef satosin6 4155 } 4156 4157 /* 4158 * compare two buffers with mask. 4159 * IN: 4160 * addr1: source 4161 * addr2: object 4162 * bits: Number of bits to compare 4163 * OUT: 4164 * 1 : equal 4165 * 0 : not equal 4166 */ 4167 static int 4168 key_bbcmp(const void *a1, const void *a2, u_int bits) 4169 { 4170 const unsigned char *p1 = a1; 4171 const unsigned char *p2 = a2; 4172 4173 /* XXX: This could be considerably faster if we compare a word 4174 * at a time, but it is complicated on LSB Endian machines */ 4175 4176 /* Handle null pointers */ 4177 if (p1 == NULL || p2 == NULL) 4178 return (p1 == p2); 4179 4180 while (bits >= 8) { 4181 if (*p1++ != *p2++) 4182 return 0; 4183 bits -= 8; 4184 } 4185 4186 if (bits > 0) { 4187 u_int8_t mask = ~((1<<(8-bits))-1); 4188 if ((*p1 & mask) != (*p2 & mask)) 4189 return 0; 4190 } 4191 return 1; /* Match! */ 4192 } 4193 4194 static void 4195 key_flush_spd(time_t now) 4196 { 4197 SPTREE_RLOCK_TRACKER; 4198 struct secpolicy *sp; 4199 u_int dir; 4200 4201 /* SPD */ 4202 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4203 restart: 4204 SPTREE_RLOCK(); 4205 TAILQ_FOREACH(sp, &V_sptree[dir], chain) { 4206 if (sp->lifetime == 0 && sp->validtime == 0) 4207 continue; 4208 if ((sp->lifetime && 4209 now - sp->created > sp->lifetime) || 4210 (sp->validtime && 4211 now - sp->lastused > sp->validtime)) { 4212 SPTREE_RUNLOCK(); 4213 key_unlink(sp); 4214 key_spdexpire(sp); 4215 KEY_FREESP(&sp); 4216 goto restart; 4217 } 4218 } 4219 SPTREE_RUNLOCK(); 4220 } 4221 } 4222 4223 static void 4224 key_flush_sad(time_t now) 4225 { 4226 struct secashead *sah, *nextsah; 4227 struct secasvar *sav, *nextsav; 4228 4229 /* SAD */ 4230 SAHTREE_LOCK(); 4231 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4232 /* if sah has been dead, then delete it and process next sah. */ 4233 if (sah->state == SADB_SASTATE_DEAD) { 4234 key_delsah(sah); 4235 continue; 4236 } 4237 4238 /* if LARVAL entry doesn't become MATURE, delete it. */ 4239 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4240 /* Need to also check refcnt for a larval SA ??? */ 4241 if (now - sav->created > V_key_larval_lifetime) 4242 KEY_FREESAV(&sav); 4243 } 4244 4245 /* 4246 * check MATURE entry to start to send expire message 4247 * whether or not. 4248 */ 4249 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4250 /* we don't need to check. */ 4251 if (sav->lft_s == NULL) 4252 continue; 4253 4254 /* sanity check */ 4255 if (sav->lft_c == NULL) { 4256 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4257 "time, why?\n", __func__)); 4258 continue; 4259 } 4260 4261 /* check SOFT lifetime */ 4262 if (sav->lft_s->addtime != 0 && 4263 now - sav->created > sav->lft_s->addtime) { 4264 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4265 /* 4266 * Actually, only send expire message if 4267 * SA has been used, as it was done before, 4268 * but should we always send such message, 4269 * and let IKE daemon decide if it should be 4270 * renegotiated or not ? 4271 * XXX expire message will actually NOT be 4272 * sent if SA is only used after soft 4273 * lifetime has been reached, see below 4274 * (DYING state) 4275 */ 4276 if (sav->lft_c->usetime != 0) 4277 key_expire(sav); 4278 } 4279 /* check SOFT lifetime by bytes */ 4280 /* 4281 * XXX I don't know the way to delete this SA 4282 * when new SA is installed. Caution when it's 4283 * installed too big lifetime by time. 4284 */ 4285 else if (sav->lft_s->bytes != 0 && 4286 sav->lft_s->bytes < sav->lft_c->bytes) { 4287 4288 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4289 /* 4290 * XXX If we keep to send expire 4291 * message in the status of 4292 * DYING. Do remove below code. 4293 */ 4294 key_expire(sav); 4295 } 4296 } 4297 4298 /* check DYING entry to change status to DEAD. */ 4299 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4300 /* we don't need to check. */ 4301 if (sav->lft_h == NULL) 4302 continue; 4303 4304 /* sanity check */ 4305 if (sav->lft_c == NULL) { 4306 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4307 "time, why?\n", __func__)); 4308 continue; 4309 } 4310 4311 if (sav->lft_h->addtime != 0 && 4312 now - sav->created > sav->lft_h->addtime) { 4313 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4314 KEY_FREESAV(&sav); 4315 } 4316 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4317 else if (sav->lft_s != NULL 4318 && sav->lft_s->addtime != 0 4319 && now - sav->created > sav->lft_s->addtime) { 4320 /* 4321 * XXX: should be checked to be 4322 * installed the valid SA. 4323 */ 4324 4325 /* 4326 * If there is no SA then sending 4327 * expire message. 4328 */ 4329 key_expire(sav); 4330 } 4331 #endif 4332 /* check HARD lifetime by bytes */ 4333 else if (sav->lft_h->bytes != 0 && 4334 sav->lft_h->bytes < sav->lft_c->bytes) { 4335 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4336 KEY_FREESAV(&sav); 4337 } 4338 } 4339 4340 /* delete entry in DEAD */ 4341 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4342 /* sanity check */ 4343 if (sav->state != SADB_SASTATE_DEAD) { 4344 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4345 "(queue: %d SA: %d): kill it anyway\n", 4346 __func__, 4347 SADB_SASTATE_DEAD, sav->state)); 4348 } 4349 /* 4350 * do not call key_freesav() here. 4351 * sav should already be freed, and sav->refcnt 4352 * shows other references to sav 4353 * (such as from SPD). 4354 */ 4355 } 4356 } 4357 SAHTREE_UNLOCK(); 4358 } 4359 4360 static void 4361 key_flush_acq(time_t now) 4362 { 4363 struct secacq *acq, *nextacq; 4364 4365 /* ACQ tree */ 4366 ACQ_LOCK(); 4367 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4368 nextacq = LIST_NEXT(acq, chain); 4369 if (now - acq->created > V_key_blockacq_lifetime 4370 && __LIST_CHAINED(acq)) { 4371 LIST_REMOVE(acq, chain); 4372 free(acq, M_IPSEC_SAQ); 4373 } 4374 } 4375 ACQ_UNLOCK(); 4376 } 4377 4378 static void 4379 key_flush_spacq(time_t now) 4380 { 4381 struct secspacq *acq, *nextacq; 4382 4383 /* SP ACQ tree */ 4384 SPACQ_LOCK(); 4385 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4386 nextacq = LIST_NEXT(acq, chain); 4387 if (now - acq->created > V_key_blockacq_lifetime 4388 && __LIST_CHAINED(acq)) { 4389 LIST_REMOVE(acq, chain); 4390 free(acq, M_IPSEC_SAQ); 4391 } 4392 } 4393 SPACQ_UNLOCK(); 4394 } 4395 4396 /* 4397 * time handler. 4398 * scanning SPD and SAD to check status for each entries, 4399 * and do to remove or to expire. 4400 * XXX: year 2038 problem may remain. 4401 */ 4402 static void 4403 key_timehandler(void *arg) 4404 { 4405 VNET_ITERATOR_DECL(vnet_iter); 4406 time_t now = time_second; 4407 4408 VNET_LIST_RLOCK_NOSLEEP(); 4409 VNET_FOREACH(vnet_iter) { 4410 CURVNET_SET(vnet_iter); 4411 key_flush_spd(now); 4412 key_flush_sad(now); 4413 key_flush_acq(now); 4414 key_flush_spacq(now); 4415 CURVNET_RESTORE(); 4416 } 4417 VNET_LIST_RUNLOCK_NOSLEEP(); 4418 4419 #ifndef IPSEC_DEBUG2 4420 /* do exchange to tick time !! */ 4421 callout_schedule(&key_timer, hz); 4422 #endif /* IPSEC_DEBUG2 */ 4423 } 4424 4425 u_long 4426 key_random() 4427 { 4428 u_long value; 4429 4430 key_randomfill(&value, sizeof(value)); 4431 return value; 4432 } 4433 4434 void 4435 key_randomfill(void *p, size_t l) 4436 { 4437 size_t n; 4438 u_long v; 4439 static int warn = 1; 4440 4441 n = 0; 4442 n = (size_t)read_random(p, (u_int)l); 4443 /* last resort */ 4444 while (n < l) { 4445 v = random(); 4446 bcopy(&v, (u_int8_t *)p + n, 4447 l - n < sizeof(v) ? l - n : sizeof(v)); 4448 n += sizeof(v); 4449 4450 if (warn) { 4451 printf("WARNING: pseudo-random number generator " 4452 "used for IPsec processing\n"); 4453 warn = 0; 4454 } 4455 } 4456 } 4457 4458 /* 4459 * map SADB_SATYPE_* to IPPROTO_*. 4460 * if satype == SADB_SATYPE then satype is mapped to ~0. 4461 * OUT: 4462 * 0: invalid satype. 4463 */ 4464 static u_int16_t 4465 key_satype2proto(u_int8_t satype) 4466 { 4467 switch (satype) { 4468 case SADB_SATYPE_UNSPEC: 4469 return IPSEC_PROTO_ANY; 4470 case SADB_SATYPE_AH: 4471 return IPPROTO_AH; 4472 case SADB_SATYPE_ESP: 4473 return IPPROTO_ESP; 4474 case SADB_X_SATYPE_IPCOMP: 4475 return IPPROTO_IPCOMP; 4476 case SADB_X_SATYPE_TCPSIGNATURE: 4477 return IPPROTO_TCP; 4478 default: 4479 return 0; 4480 } 4481 /* NOTREACHED */ 4482 } 4483 4484 /* 4485 * map IPPROTO_* to SADB_SATYPE_* 4486 * OUT: 4487 * 0: invalid protocol type. 4488 */ 4489 static u_int8_t 4490 key_proto2satype(u_int16_t proto) 4491 { 4492 switch (proto) { 4493 case IPPROTO_AH: 4494 return SADB_SATYPE_AH; 4495 case IPPROTO_ESP: 4496 return SADB_SATYPE_ESP; 4497 case IPPROTO_IPCOMP: 4498 return SADB_X_SATYPE_IPCOMP; 4499 case IPPROTO_TCP: 4500 return SADB_X_SATYPE_TCPSIGNATURE; 4501 default: 4502 return 0; 4503 } 4504 /* NOTREACHED */ 4505 } 4506 4507 /* %%% PF_KEY */ 4508 /* 4509 * SADB_GETSPI processing is to receive 4510 * <base, (SA2), src address, dst address, (SPI range)> 4511 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4512 * tree with the status of LARVAL, and send 4513 * <base, SA(*), address(SD)> 4514 * to the IKMPd. 4515 * 4516 * IN: mhp: pointer to the pointer to each header. 4517 * OUT: NULL if fail. 4518 * other if success, return pointer to the message to send. 4519 */ 4520 static int 4521 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 4522 { 4523 struct sadb_address *src0, *dst0; 4524 struct secasindex saidx; 4525 struct secashead *newsah; 4526 struct secasvar *newsav; 4527 u_int8_t proto; 4528 u_int32_t spi; 4529 u_int8_t mode; 4530 u_int32_t reqid; 4531 int error; 4532 4533 IPSEC_ASSERT(so != NULL, ("null socket")); 4534 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4535 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4536 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4537 4538 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4539 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4540 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4541 __func__)); 4542 return key_senderror(so, m, EINVAL); 4543 } 4544 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4545 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4546 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4547 __func__)); 4548 return key_senderror(so, m, EINVAL); 4549 } 4550 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4551 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4552 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4553 } else { 4554 mode = IPSEC_MODE_ANY; 4555 reqid = 0; 4556 } 4557 4558 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4559 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4560 4561 /* map satype to proto */ 4562 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4563 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4564 __func__)); 4565 return key_senderror(so, m, EINVAL); 4566 } 4567 4568 /* 4569 * Make sure the port numbers are zero. 4570 * In case of NAT-T we will update them later if needed. 4571 */ 4572 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4573 case AF_INET: 4574 if (((struct sockaddr *)(src0 + 1))->sa_len != 4575 sizeof(struct sockaddr_in)) 4576 return key_senderror(so, m, EINVAL); 4577 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4578 break; 4579 case AF_INET6: 4580 if (((struct sockaddr *)(src0 + 1))->sa_len != 4581 sizeof(struct sockaddr_in6)) 4582 return key_senderror(so, m, EINVAL); 4583 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4584 break; 4585 default: 4586 ; /*???*/ 4587 } 4588 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4589 case AF_INET: 4590 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4591 sizeof(struct sockaddr_in)) 4592 return key_senderror(so, m, EINVAL); 4593 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4594 break; 4595 case AF_INET6: 4596 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4597 sizeof(struct sockaddr_in6)) 4598 return key_senderror(so, m, EINVAL); 4599 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4600 break; 4601 default: 4602 ; /*???*/ 4603 } 4604 4605 /* XXX boundary check against sa_len */ 4606 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4607 4608 #ifdef IPSEC_NAT_T 4609 /* 4610 * Handle NAT-T info if present. 4611 * We made sure the port numbers are zero above, so we do 4612 * not have to worry in case we do not update them. 4613 */ 4614 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 4615 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__)); 4616 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 4617 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__)); 4618 4619 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4620 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4621 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4622 struct sadb_x_nat_t_type *type; 4623 struct sadb_x_nat_t_port *sport, *dport; 4624 4625 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4626 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4627 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4628 ipseclog((LOG_DEBUG, "%s: invalid nat-t message " 4629 "passed.\n", __func__)); 4630 return key_senderror(so, m, EINVAL); 4631 } 4632 4633 sport = (struct sadb_x_nat_t_port *) 4634 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4635 dport = (struct sadb_x_nat_t_port *) 4636 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4637 4638 if (sport) 4639 KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port); 4640 if (dport) 4641 KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port); 4642 } 4643 #endif 4644 4645 /* SPI allocation */ 4646 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4647 &saidx); 4648 if (spi == 0) 4649 return key_senderror(so, m, EINVAL); 4650 4651 /* get a SA index */ 4652 if ((newsah = key_getsah(&saidx)) == NULL) { 4653 /* create a new SA index */ 4654 if ((newsah = key_newsah(&saidx)) == NULL) { 4655 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4656 return key_senderror(so, m, ENOBUFS); 4657 } 4658 } 4659 4660 /* get a new SA */ 4661 /* XXX rewrite */ 4662 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4663 if (newsav == NULL) { 4664 /* XXX don't free new SA index allocated in above. */ 4665 return key_senderror(so, m, error); 4666 } 4667 4668 /* set spi */ 4669 newsav->spi = htonl(spi); 4670 4671 /* delete the entry in acqtree */ 4672 if (mhp->msg->sadb_msg_seq != 0) { 4673 struct secacq *acq; 4674 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4675 /* reset counter in order to deletion by timehandler. */ 4676 acq->created = time_second; 4677 acq->count = 0; 4678 } 4679 } 4680 4681 { 4682 struct mbuf *n, *nn; 4683 struct sadb_sa *m_sa; 4684 struct sadb_msg *newmsg; 4685 int off, len; 4686 4687 /* create new sadb_msg to reply. */ 4688 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4689 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4690 4691 MGETHDR(n, M_NOWAIT, MT_DATA); 4692 if (len > MHLEN) { 4693 if (!(MCLGET(n, M_NOWAIT))) { 4694 m_freem(n); 4695 n = NULL; 4696 } 4697 } 4698 if (!n) 4699 return key_senderror(so, m, ENOBUFS); 4700 4701 n->m_len = len; 4702 n->m_next = NULL; 4703 off = 0; 4704 4705 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4706 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4707 4708 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4709 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4710 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4711 m_sa->sadb_sa_spi = htonl(spi); 4712 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4713 4714 IPSEC_ASSERT(off == len, 4715 ("length inconsistency (off %u len %u)", off, len)); 4716 4717 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4718 SADB_EXT_ADDRESS_DST); 4719 if (!n->m_next) { 4720 m_freem(n); 4721 return key_senderror(so, m, ENOBUFS); 4722 } 4723 4724 if (n->m_len < sizeof(struct sadb_msg)) { 4725 n = m_pullup(n, sizeof(struct sadb_msg)); 4726 if (n == NULL) 4727 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4728 } 4729 4730 n->m_pkthdr.len = 0; 4731 for (nn = n; nn; nn = nn->m_next) 4732 n->m_pkthdr.len += nn->m_len; 4733 4734 newmsg = mtod(n, struct sadb_msg *); 4735 newmsg->sadb_msg_seq = newsav->seq; 4736 newmsg->sadb_msg_errno = 0; 4737 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4738 4739 m_freem(m); 4740 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4741 } 4742 } 4743 4744 /* 4745 * allocating new SPI 4746 * called by key_getspi(). 4747 * OUT: 4748 * 0: failure. 4749 * others: success. 4750 */ 4751 static u_int32_t 4752 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx) 4753 { 4754 u_int32_t newspi; 4755 u_int32_t min, max; 4756 int count = V_key_spi_trycnt; 4757 4758 /* set spi range to allocate */ 4759 if (spirange != NULL) { 4760 min = spirange->sadb_spirange_min; 4761 max = spirange->sadb_spirange_max; 4762 } else { 4763 min = V_key_spi_minval; 4764 max = V_key_spi_maxval; 4765 } 4766 /* IPCOMP needs 2-byte SPI */ 4767 if (saidx->proto == IPPROTO_IPCOMP) { 4768 u_int32_t t; 4769 if (min >= 0x10000) 4770 min = 0xffff; 4771 if (max >= 0x10000) 4772 max = 0xffff; 4773 if (min > max) { 4774 t = min; min = max; max = t; 4775 } 4776 } 4777 4778 if (min == max) { 4779 if (key_checkspidup(saidx, min) != NULL) { 4780 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4781 __func__, min)); 4782 return 0; 4783 } 4784 4785 count--; /* taking one cost. */ 4786 newspi = min; 4787 4788 } else { 4789 4790 /* init SPI */ 4791 newspi = 0; 4792 4793 /* when requesting to allocate spi ranged */ 4794 while (count--) { 4795 /* generate pseudo-random SPI value ranged. */ 4796 newspi = min + (key_random() % (max - min + 1)); 4797 4798 if (key_checkspidup(saidx, newspi) == NULL) 4799 break; 4800 } 4801 4802 if (count == 0 || newspi == 0) { 4803 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4804 __func__)); 4805 return 0; 4806 } 4807 } 4808 4809 /* statistics */ 4810 keystat.getspi_count = 4811 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4812 4813 return newspi; 4814 } 4815 4816 /* 4817 * SADB_UPDATE processing 4818 * receive 4819 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4820 * key(AE), (identity(SD),) (sensitivity)> 4821 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4822 * and send 4823 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4824 * (identity(SD),) (sensitivity)> 4825 * to the ikmpd. 4826 * 4827 * m will always be freed. 4828 */ 4829 static int 4830 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 4831 { 4832 struct sadb_sa *sa0; 4833 struct sadb_address *src0, *dst0; 4834 #ifdef IPSEC_NAT_T 4835 struct sadb_x_nat_t_type *type; 4836 struct sadb_x_nat_t_port *sport, *dport; 4837 struct sadb_address *iaddr, *raddr; 4838 struct sadb_x_nat_t_frag *frag; 4839 #endif 4840 struct secasindex saidx; 4841 struct secashead *sah; 4842 struct secasvar *sav; 4843 u_int16_t proto; 4844 u_int8_t mode; 4845 u_int32_t reqid; 4846 int error; 4847 4848 IPSEC_ASSERT(so != NULL, ("null socket")); 4849 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4850 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4851 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4852 4853 /* map satype to proto */ 4854 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4855 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4856 __func__)); 4857 return key_senderror(so, m, EINVAL); 4858 } 4859 4860 if (mhp->ext[SADB_EXT_SA] == NULL || 4861 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4862 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4863 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4864 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4865 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4866 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4867 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4868 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4869 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4870 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4871 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4872 __func__)); 4873 return key_senderror(so, m, EINVAL); 4874 } 4875 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4876 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4877 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4878 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4879 __func__)); 4880 return key_senderror(so, m, EINVAL); 4881 } 4882 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4883 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4884 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4885 } else { 4886 mode = IPSEC_MODE_ANY; 4887 reqid = 0; 4888 } 4889 /* XXX boundary checking for other extensions */ 4890 4891 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4892 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4893 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4894 4895 /* XXX boundary check against sa_len */ 4896 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4897 4898 /* 4899 * Make sure the port numbers are zero. 4900 * In case of NAT-T we will update them later if needed. 4901 */ 4902 KEY_PORTTOSADDR(&saidx.src, 0); 4903 KEY_PORTTOSADDR(&saidx.dst, 0); 4904 4905 #ifdef IPSEC_NAT_T 4906 /* 4907 * Handle NAT-T info if present. 4908 */ 4909 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4910 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4911 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4912 4913 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4914 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4915 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4916 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 4917 __func__)); 4918 return key_senderror(so, m, EINVAL); 4919 } 4920 4921 type = (struct sadb_x_nat_t_type *) 4922 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 4923 sport = (struct sadb_x_nat_t_port *) 4924 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4925 dport = (struct sadb_x_nat_t_port *) 4926 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4927 } else { 4928 type = 0; 4929 sport = dport = 0; 4930 } 4931 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 4932 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 4933 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 4934 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 4935 ipseclog((LOG_DEBUG, "%s: invalid message\n", 4936 __func__)); 4937 return key_senderror(so, m, EINVAL); 4938 } 4939 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 4940 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 4941 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 4942 } else { 4943 iaddr = raddr = NULL; 4944 } 4945 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 4946 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 4947 ipseclog((LOG_DEBUG, "%s: invalid message\n", 4948 __func__)); 4949 return key_senderror(so, m, EINVAL); 4950 } 4951 frag = (struct sadb_x_nat_t_frag *) 4952 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 4953 } else { 4954 frag = 0; 4955 } 4956 #endif 4957 4958 /* get a SA header */ 4959 if ((sah = key_getsah(&saidx)) == NULL) { 4960 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4961 return key_senderror(so, m, ENOENT); 4962 } 4963 4964 /* set spidx if there */ 4965 /* XXX rewrite */ 4966 error = key_setident(sah, m, mhp); 4967 if (error) 4968 return key_senderror(so, m, error); 4969 4970 /* find a SA with sequence number. */ 4971 #ifdef IPSEC_DOSEQCHECK 4972 if (mhp->msg->sadb_msg_seq != 0 4973 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4974 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4975 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4976 return key_senderror(so, m, ENOENT); 4977 } 4978 #else 4979 SAHTREE_LOCK(); 4980 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4981 SAHTREE_UNLOCK(); 4982 if (sav == NULL) { 4983 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4984 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4985 return key_senderror(so, m, EINVAL); 4986 } 4987 #endif 4988 4989 /* validity check */ 4990 if (sav->sah->saidx.proto != proto) { 4991 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4992 "(DB=%u param=%u)\n", __func__, 4993 sav->sah->saidx.proto, proto)); 4994 return key_senderror(so, m, EINVAL); 4995 } 4996 #ifdef IPSEC_DOSEQCHECK 4997 if (sav->spi != sa0->sadb_sa_spi) { 4998 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4999 __func__, 5000 (u_int32_t)ntohl(sav->spi), 5001 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5002 return key_senderror(so, m, EINVAL); 5003 } 5004 #endif 5005 if (sav->pid != mhp->msg->sadb_msg_pid) { 5006 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 5007 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 5008 return key_senderror(so, m, EINVAL); 5009 } 5010 5011 /* copy sav values */ 5012 error = key_setsaval(sav, m, mhp); 5013 if (error) { 5014 KEY_FREESAV(&sav); 5015 return key_senderror(so, m, error); 5016 } 5017 5018 #ifdef IPSEC_NAT_T 5019 /* 5020 * Handle more NAT-T info if present, 5021 * now that we have a sav to fill. 5022 */ 5023 if (type) 5024 sav->natt_type = type->sadb_x_nat_t_type_type; 5025 5026 if (sport) 5027 KEY_PORTTOSADDR(&sav->sah->saidx.src, 5028 sport->sadb_x_nat_t_port_port); 5029 if (dport) 5030 KEY_PORTTOSADDR(&sav->sah->saidx.dst, 5031 dport->sadb_x_nat_t_port_port); 5032 5033 #if 0 5034 /* 5035 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5036 * We should actually check for a minimum MTU here, if we 5037 * want to support it in ip_output. 5038 */ 5039 if (frag) 5040 sav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5041 #endif 5042 #endif 5043 5044 /* check SA values to be mature. */ 5045 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 5046 KEY_FREESAV(&sav); 5047 return key_senderror(so, m, 0); 5048 } 5049 5050 { 5051 struct mbuf *n; 5052 5053 /* set msg buf from mhp */ 5054 n = key_getmsgbuf_x1(m, mhp); 5055 if (n == NULL) { 5056 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5057 return key_senderror(so, m, ENOBUFS); 5058 } 5059 5060 m_freem(m); 5061 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5062 } 5063 } 5064 5065 /* 5066 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5067 * only called by key_update(). 5068 * OUT: 5069 * NULL : not found 5070 * others : found, pointer to a SA. 5071 */ 5072 #ifdef IPSEC_DOSEQCHECK 5073 static struct secasvar * 5074 key_getsavbyseq(struct secashead *sah, u_int32_t seq) 5075 { 5076 struct secasvar *sav; 5077 u_int state; 5078 5079 state = SADB_SASTATE_LARVAL; 5080 5081 /* search SAD with sequence number ? */ 5082 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5083 5084 KEY_CHKSASTATE(state, sav->state, __func__); 5085 5086 if (sav->seq == seq) { 5087 sa_addref(sav); 5088 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 5089 printf("DP %s cause refcnt++:%d SA:%p\n", 5090 __func__, sav->refcnt, sav)); 5091 return sav; 5092 } 5093 } 5094 5095 return NULL; 5096 } 5097 #endif 5098 5099 /* 5100 * SADB_ADD processing 5101 * add an entry to SA database, when received 5102 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5103 * key(AE), (identity(SD),) (sensitivity)> 5104 * from the ikmpd, 5105 * and send 5106 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5107 * (identity(SD),) (sensitivity)> 5108 * to the ikmpd. 5109 * 5110 * IGNORE identity and sensitivity messages. 5111 * 5112 * m will always be freed. 5113 */ 5114 static int 5115 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5116 { 5117 struct sadb_sa *sa0; 5118 struct sadb_address *src0, *dst0; 5119 #ifdef IPSEC_NAT_T 5120 struct sadb_x_nat_t_type *type; 5121 struct sadb_address *iaddr, *raddr; 5122 struct sadb_x_nat_t_frag *frag; 5123 #endif 5124 struct secasindex saidx; 5125 struct secashead *newsah; 5126 struct secasvar *newsav; 5127 u_int16_t proto; 5128 u_int8_t mode; 5129 u_int32_t reqid; 5130 int error; 5131 5132 IPSEC_ASSERT(so != NULL, ("null socket")); 5133 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5134 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5135 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5136 5137 /* map satype to proto */ 5138 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5139 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5140 __func__)); 5141 return key_senderror(so, m, EINVAL); 5142 } 5143 5144 if (mhp->ext[SADB_EXT_SA] == NULL || 5145 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5146 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5147 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5148 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5149 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5150 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5151 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5152 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5153 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5154 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5155 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5156 __func__)); 5157 return key_senderror(so, m, EINVAL); 5158 } 5159 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5160 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5161 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5162 /* XXX need more */ 5163 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5164 __func__)); 5165 return key_senderror(so, m, EINVAL); 5166 } 5167 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5168 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5169 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5170 } else { 5171 mode = IPSEC_MODE_ANY; 5172 reqid = 0; 5173 } 5174 5175 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5176 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5177 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5178 5179 /* XXX boundary check against sa_len */ 5180 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5181 5182 /* 5183 * Make sure the port numbers are zero. 5184 * In case of NAT-T we will update them later if needed. 5185 */ 5186 KEY_PORTTOSADDR(&saidx.src, 0); 5187 KEY_PORTTOSADDR(&saidx.dst, 0); 5188 5189 #ifdef IPSEC_NAT_T 5190 /* 5191 * Handle NAT-T info if present. 5192 */ 5193 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5194 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5195 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5196 struct sadb_x_nat_t_port *sport, *dport; 5197 5198 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5199 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5200 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5201 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5202 __func__)); 5203 return key_senderror(so, m, EINVAL); 5204 } 5205 5206 type = (struct sadb_x_nat_t_type *) 5207 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5208 sport = (struct sadb_x_nat_t_port *) 5209 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5210 dport = (struct sadb_x_nat_t_port *) 5211 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5212 5213 if (sport) 5214 KEY_PORTTOSADDR(&saidx.src, 5215 sport->sadb_x_nat_t_port_port); 5216 if (dport) 5217 KEY_PORTTOSADDR(&saidx.dst, 5218 dport->sadb_x_nat_t_port_port); 5219 } else { 5220 type = 0; 5221 } 5222 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5223 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5224 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5225 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5226 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5227 __func__)); 5228 return key_senderror(so, m, EINVAL); 5229 } 5230 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5231 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5232 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5233 } else { 5234 iaddr = raddr = NULL; 5235 } 5236 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5237 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5238 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5239 __func__)); 5240 return key_senderror(so, m, EINVAL); 5241 } 5242 frag = (struct sadb_x_nat_t_frag *) 5243 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5244 } else { 5245 frag = 0; 5246 } 5247 #endif 5248 5249 /* get a SA header */ 5250 if ((newsah = key_getsah(&saidx)) == NULL) { 5251 /* create a new SA header */ 5252 if ((newsah = key_newsah(&saidx)) == NULL) { 5253 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 5254 return key_senderror(so, m, ENOBUFS); 5255 } 5256 } 5257 5258 /* set spidx if there */ 5259 /* XXX rewrite */ 5260 error = key_setident(newsah, m, mhp); 5261 if (error) { 5262 return key_senderror(so, m, error); 5263 } 5264 5265 /* create new SA entry. */ 5266 /* We can create new SA only if SPI is differenct. */ 5267 SAHTREE_LOCK(); 5268 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5269 SAHTREE_UNLOCK(); 5270 if (newsav != NULL) { 5271 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5272 return key_senderror(so, m, EEXIST); 5273 } 5274 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5275 if (newsav == NULL) { 5276 return key_senderror(so, m, error); 5277 } 5278 5279 #ifdef IPSEC_NAT_T 5280 /* 5281 * Handle more NAT-T info if present, 5282 * now that we have a sav to fill. 5283 */ 5284 if (type) 5285 newsav->natt_type = type->sadb_x_nat_t_type_type; 5286 5287 #if 0 5288 /* 5289 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5290 * We should actually check for a minimum MTU here, if we 5291 * want to support it in ip_output. 5292 */ 5293 if (frag) 5294 newsav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5295 #endif 5296 #endif 5297 5298 /* check SA values to be mature. */ 5299 if ((error = key_mature(newsav)) != 0) { 5300 KEY_FREESAV(&newsav); 5301 return key_senderror(so, m, error); 5302 } 5303 5304 /* 5305 * don't call key_freesav() here, as we would like to keep the SA 5306 * in the database on success. 5307 */ 5308 5309 { 5310 struct mbuf *n; 5311 5312 /* set msg buf from mhp */ 5313 n = key_getmsgbuf_x1(m, mhp); 5314 if (n == NULL) { 5315 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5316 return key_senderror(so, m, ENOBUFS); 5317 } 5318 5319 m_freem(m); 5320 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5321 } 5322 } 5323 5324 /* m is retained */ 5325 static int 5326 key_setident(struct secashead *sah, struct mbuf *m, 5327 const struct sadb_msghdr *mhp) 5328 { 5329 const struct sadb_ident *idsrc, *iddst; 5330 int idsrclen, iddstlen; 5331 5332 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5333 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5334 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5335 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5336 5337 /* don't make buffer if not there */ 5338 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5339 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5340 sah->idents = NULL; 5341 sah->identd = NULL; 5342 return 0; 5343 } 5344 5345 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5346 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5347 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5348 return EINVAL; 5349 } 5350 5351 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5352 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5353 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5354 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5355 5356 /* validity check */ 5357 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5358 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5359 return EINVAL; 5360 } 5361 5362 switch (idsrc->sadb_ident_type) { 5363 case SADB_IDENTTYPE_PREFIX: 5364 case SADB_IDENTTYPE_FQDN: 5365 case SADB_IDENTTYPE_USERFQDN: 5366 default: 5367 /* XXX do nothing */ 5368 sah->idents = NULL; 5369 sah->identd = NULL; 5370 return 0; 5371 } 5372 5373 /* make structure */ 5374 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5375 if (sah->idents == NULL) { 5376 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5377 return ENOBUFS; 5378 } 5379 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5380 if (sah->identd == NULL) { 5381 free(sah->idents, M_IPSEC_MISC); 5382 sah->idents = NULL; 5383 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5384 return ENOBUFS; 5385 } 5386 sah->idents->type = idsrc->sadb_ident_type; 5387 sah->idents->id = idsrc->sadb_ident_id; 5388 5389 sah->identd->type = iddst->sadb_ident_type; 5390 sah->identd->id = iddst->sadb_ident_id; 5391 5392 return 0; 5393 } 5394 5395 /* 5396 * m will not be freed on return. 5397 * it is caller's responsibility to free the result. 5398 */ 5399 static struct mbuf * 5400 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp) 5401 { 5402 struct mbuf *n; 5403 5404 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5405 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5406 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5407 5408 /* create new sadb_msg to reply. */ 5409 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5410 SADB_EXT_SA, SADB_X_EXT_SA2, 5411 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5412 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5413 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5414 if (!n) 5415 return NULL; 5416 5417 if (n->m_len < sizeof(struct sadb_msg)) { 5418 n = m_pullup(n, sizeof(struct sadb_msg)); 5419 if (n == NULL) 5420 return NULL; 5421 } 5422 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5423 mtod(n, struct sadb_msg *)->sadb_msg_len = 5424 PFKEY_UNIT64(n->m_pkthdr.len); 5425 5426 return n; 5427 } 5428 5429 /* 5430 * SADB_DELETE processing 5431 * receive 5432 * <base, SA(*), address(SD)> 5433 * from the ikmpd, and set SADB_SASTATE_DEAD, 5434 * and send, 5435 * <base, SA(*), address(SD)> 5436 * to the ikmpd. 5437 * 5438 * m will always be freed. 5439 */ 5440 static int 5441 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5442 { 5443 struct sadb_sa *sa0; 5444 struct sadb_address *src0, *dst0; 5445 struct secasindex saidx; 5446 struct secashead *sah; 5447 struct secasvar *sav = NULL; 5448 u_int16_t proto; 5449 5450 IPSEC_ASSERT(so != NULL, ("null socket")); 5451 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5452 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5453 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5454 5455 /* map satype to proto */ 5456 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5457 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5458 __func__)); 5459 return key_senderror(so, m, EINVAL); 5460 } 5461 5462 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5463 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5464 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5465 __func__)); 5466 return key_senderror(so, m, EINVAL); 5467 } 5468 5469 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5470 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5471 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5472 __func__)); 5473 return key_senderror(so, m, EINVAL); 5474 } 5475 5476 if (mhp->ext[SADB_EXT_SA] == NULL) { 5477 /* 5478 * Caller wants us to delete all non-LARVAL SAs 5479 * that match the src/dst. This is used during 5480 * IKE INITIAL-CONTACT. 5481 */ 5482 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5483 return key_delete_all(so, m, mhp, proto); 5484 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5485 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5486 __func__)); 5487 return key_senderror(so, m, EINVAL); 5488 } 5489 5490 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5491 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5492 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5493 5494 /* XXX boundary check against sa_len */ 5495 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5496 5497 /* 5498 * Make sure the port numbers are zero. 5499 * In case of NAT-T we will update them later if needed. 5500 */ 5501 KEY_PORTTOSADDR(&saidx.src, 0); 5502 KEY_PORTTOSADDR(&saidx.dst, 0); 5503 5504 #ifdef IPSEC_NAT_T 5505 /* 5506 * Handle NAT-T info if present. 5507 */ 5508 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5509 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5510 struct sadb_x_nat_t_port *sport, *dport; 5511 5512 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5513 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5514 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5515 __func__)); 5516 return key_senderror(so, m, EINVAL); 5517 } 5518 5519 sport = (struct sadb_x_nat_t_port *) 5520 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5521 dport = (struct sadb_x_nat_t_port *) 5522 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5523 5524 if (sport) 5525 KEY_PORTTOSADDR(&saidx.src, 5526 sport->sadb_x_nat_t_port_port); 5527 if (dport) 5528 KEY_PORTTOSADDR(&saidx.dst, 5529 dport->sadb_x_nat_t_port_port); 5530 } 5531 #endif 5532 5533 /* get a SA header */ 5534 SAHTREE_LOCK(); 5535 LIST_FOREACH(sah, &V_sahtree, chain) { 5536 if (sah->state == SADB_SASTATE_DEAD) 5537 continue; 5538 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5539 continue; 5540 5541 /* get a SA with SPI. */ 5542 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5543 if (sav) 5544 break; 5545 } 5546 if (sah == NULL) { 5547 SAHTREE_UNLOCK(); 5548 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5549 return key_senderror(so, m, ENOENT); 5550 } 5551 5552 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5553 KEY_FREESAV(&sav); 5554 SAHTREE_UNLOCK(); 5555 5556 { 5557 struct mbuf *n; 5558 struct sadb_msg *newmsg; 5559 5560 /* create new sadb_msg to reply. */ 5561 /* XXX-BZ NAT-T extensions? */ 5562 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5563 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5564 if (!n) 5565 return key_senderror(so, m, ENOBUFS); 5566 5567 if (n->m_len < sizeof(struct sadb_msg)) { 5568 n = m_pullup(n, sizeof(struct sadb_msg)); 5569 if (n == NULL) 5570 return key_senderror(so, m, ENOBUFS); 5571 } 5572 newmsg = mtod(n, struct sadb_msg *); 5573 newmsg->sadb_msg_errno = 0; 5574 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5575 5576 m_freem(m); 5577 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5578 } 5579 } 5580 5581 /* 5582 * delete all SAs for src/dst. Called from key_delete(). 5583 */ 5584 static int 5585 key_delete_all(struct socket *so, struct mbuf *m, 5586 const struct sadb_msghdr *mhp, u_int16_t proto) 5587 { 5588 struct sadb_address *src0, *dst0; 5589 struct secasindex saidx; 5590 struct secashead *sah; 5591 struct secasvar *sav, *nextsav; 5592 u_int stateidx, state; 5593 5594 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5595 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5596 5597 /* XXX boundary check against sa_len */ 5598 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5599 5600 /* 5601 * Make sure the port numbers are zero. 5602 * In case of NAT-T we will update them later if needed. 5603 */ 5604 KEY_PORTTOSADDR(&saidx.src, 0); 5605 KEY_PORTTOSADDR(&saidx.dst, 0); 5606 5607 #ifdef IPSEC_NAT_T 5608 /* 5609 * Handle NAT-T info if present. 5610 */ 5611 5612 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5613 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5614 struct sadb_x_nat_t_port *sport, *dport; 5615 5616 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5617 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5618 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5619 __func__)); 5620 return key_senderror(so, m, EINVAL); 5621 } 5622 5623 sport = (struct sadb_x_nat_t_port *) 5624 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5625 dport = (struct sadb_x_nat_t_port *) 5626 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5627 5628 if (sport) 5629 KEY_PORTTOSADDR(&saidx.src, 5630 sport->sadb_x_nat_t_port_port); 5631 if (dport) 5632 KEY_PORTTOSADDR(&saidx.dst, 5633 dport->sadb_x_nat_t_port_port); 5634 } 5635 #endif 5636 5637 SAHTREE_LOCK(); 5638 LIST_FOREACH(sah, &V_sahtree, chain) { 5639 if (sah->state == SADB_SASTATE_DEAD) 5640 continue; 5641 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5642 continue; 5643 5644 /* Delete all non-LARVAL SAs. */ 5645 for (stateidx = 0; 5646 stateidx < _ARRAYLEN(saorder_state_alive); 5647 stateidx++) { 5648 state = saorder_state_alive[stateidx]; 5649 if (state == SADB_SASTATE_LARVAL) 5650 continue; 5651 for (sav = LIST_FIRST(&sah->savtree[state]); 5652 sav != NULL; sav = nextsav) { 5653 nextsav = LIST_NEXT(sav, chain); 5654 /* sanity check */ 5655 if (sav->state != state) { 5656 ipseclog((LOG_DEBUG, "%s: invalid " 5657 "sav->state (queue %d SA %d)\n", 5658 __func__, state, sav->state)); 5659 continue; 5660 } 5661 5662 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5663 KEY_FREESAV(&sav); 5664 } 5665 } 5666 } 5667 SAHTREE_UNLOCK(); 5668 { 5669 struct mbuf *n; 5670 struct sadb_msg *newmsg; 5671 5672 /* create new sadb_msg to reply. */ 5673 /* XXX-BZ NAT-T extensions? */ 5674 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5675 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5676 if (!n) 5677 return key_senderror(so, m, ENOBUFS); 5678 5679 if (n->m_len < sizeof(struct sadb_msg)) { 5680 n = m_pullup(n, sizeof(struct sadb_msg)); 5681 if (n == NULL) 5682 return key_senderror(so, m, ENOBUFS); 5683 } 5684 newmsg = mtod(n, struct sadb_msg *); 5685 newmsg->sadb_msg_errno = 0; 5686 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5687 5688 m_freem(m); 5689 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5690 } 5691 } 5692 5693 /* 5694 * SADB_GET processing 5695 * receive 5696 * <base, SA(*), address(SD)> 5697 * from the ikmpd, and get a SP and a SA to respond, 5698 * and send, 5699 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5700 * (identity(SD),) (sensitivity)> 5701 * to the ikmpd. 5702 * 5703 * m will always be freed. 5704 */ 5705 static int 5706 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5707 { 5708 struct sadb_sa *sa0; 5709 struct sadb_address *src0, *dst0; 5710 struct secasindex saidx; 5711 struct secashead *sah; 5712 struct secasvar *sav = NULL; 5713 u_int16_t proto; 5714 5715 IPSEC_ASSERT(so != NULL, ("null socket")); 5716 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5717 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5718 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5719 5720 /* map satype to proto */ 5721 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5722 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5723 __func__)); 5724 return key_senderror(so, m, EINVAL); 5725 } 5726 5727 if (mhp->ext[SADB_EXT_SA] == NULL || 5728 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5729 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5730 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5731 __func__)); 5732 return key_senderror(so, m, EINVAL); 5733 } 5734 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5735 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5736 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5737 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5738 __func__)); 5739 return key_senderror(so, m, EINVAL); 5740 } 5741 5742 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5743 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5744 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5745 5746 /* XXX boundary check against sa_len */ 5747 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5748 5749 /* 5750 * Make sure the port numbers are zero. 5751 * In case of NAT-T we will update them later if needed. 5752 */ 5753 KEY_PORTTOSADDR(&saidx.src, 0); 5754 KEY_PORTTOSADDR(&saidx.dst, 0); 5755 5756 #ifdef IPSEC_NAT_T 5757 /* 5758 * Handle NAT-T info if present. 5759 */ 5760 5761 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5762 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5763 struct sadb_x_nat_t_port *sport, *dport; 5764 5765 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5766 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5767 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5768 __func__)); 5769 return key_senderror(so, m, EINVAL); 5770 } 5771 5772 sport = (struct sadb_x_nat_t_port *) 5773 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5774 dport = (struct sadb_x_nat_t_port *) 5775 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5776 5777 if (sport) 5778 KEY_PORTTOSADDR(&saidx.src, 5779 sport->sadb_x_nat_t_port_port); 5780 if (dport) 5781 KEY_PORTTOSADDR(&saidx.dst, 5782 dport->sadb_x_nat_t_port_port); 5783 } 5784 #endif 5785 5786 /* get a SA header */ 5787 SAHTREE_LOCK(); 5788 LIST_FOREACH(sah, &V_sahtree, chain) { 5789 if (sah->state == SADB_SASTATE_DEAD) 5790 continue; 5791 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5792 continue; 5793 5794 /* get a SA with SPI. */ 5795 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5796 if (sav) 5797 break; 5798 } 5799 SAHTREE_UNLOCK(); 5800 if (sah == NULL) { 5801 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5802 return key_senderror(so, m, ENOENT); 5803 } 5804 5805 { 5806 struct mbuf *n; 5807 u_int8_t satype; 5808 5809 /* map proto to satype */ 5810 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5811 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5812 __func__)); 5813 return key_senderror(so, m, EINVAL); 5814 } 5815 5816 /* create new sadb_msg to reply. */ 5817 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5818 mhp->msg->sadb_msg_pid); 5819 if (!n) 5820 return key_senderror(so, m, ENOBUFS); 5821 5822 m_freem(m); 5823 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5824 } 5825 } 5826 5827 /* XXX make it sysctl-configurable? */ 5828 static void 5829 key_getcomb_setlifetime(struct sadb_comb *comb) 5830 { 5831 5832 comb->sadb_comb_soft_allocations = 1; 5833 comb->sadb_comb_hard_allocations = 1; 5834 comb->sadb_comb_soft_bytes = 0; 5835 comb->sadb_comb_hard_bytes = 0; 5836 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5837 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5838 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5839 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5840 } 5841 5842 /* 5843 * XXX reorder combinations by preference 5844 * XXX no idea if the user wants ESP authentication or not 5845 */ 5846 static struct mbuf * 5847 key_getcomb_esp() 5848 { 5849 struct sadb_comb *comb; 5850 struct enc_xform *algo; 5851 struct mbuf *result = NULL, *m, *n; 5852 int encmin; 5853 int i, off, o; 5854 int totlen; 5855 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5856 5857 m = NULL; 5858 for (i = 1; i <= SADB_EALG_MAX; i++) { 5859 algo = esp_algorithm_lookup(i); 5860 if (algo == NULL) 5861 continue; 5862 5863 /* discard algorithms with key size smaller than system min */ 5864 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5865 continue; 5866 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5867 encmin = V_ipsec_esp_keymin; 5868 else 5869 encmin = _BITS(algo->minkey); 5870 5871 if (V_ipsec_esp_auth) 5872 m = key_getcomb_ah(); 5873 else { 5874 IPSEC_ASSERT(l <= MLEN, 5875 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5876 MGET(m, M_NOWAIT, MT_DATA); 5877 if (m) { 5878 M_ALIGN(m, l); 5879 m->m_len = l; 5880 m->m_next = NULL; 5881 bzero(mtod(m, caddr_t), m->m_len); 5882 } 5883 } 5884 if (!m) 5885 goto fail; 5886 5887 totlen = 0; 5888 for (n = m; n; n = n->m_next) 5889 totlen += n->m_len; 5890 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5891 5892 for (off = 0; off < totlen; off += l) { 5893 n = m_pulldown(m, off, l, &o); 5894 if (!n) { 5895 /* m is already freed */ 5896 goto fail; 5897 } 5898 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5899 bzero(comb, sizeof(*comb)); 5900 key_getcomb_setlifetime(comb); 5901 comb->sadb_comb_encrypt = i; 5902 comb->sadb_comb_encrypt_minbits = encmin; 5903 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5904 } 5905 5906 if (!result) 5907 result = m; 5908 else 5909 m_cat(result, m); 5910 } 5911 5912 return result; 5913 5914 fail: 5915 if (result) 5916 m_freem(result); 5917 return NULL; 5918 } 5919 5920 static void 5921 key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* min, 5922 u_int16_t* max) 5923 { 5924 5925 *min = *max = ah->keysize; 5926 if (ah->keysize == 0) { 5927 /* 5928 * Transform takes arbitrary key size but algorithm 5929 * key size is restricted. Enforce this here. 5930 */ 5931 switch (alg) { 5932 case SADB_X_AALG_MD5: *min = *max = 16; break; 5933 case SADB_X_AALG_SHA: *min = *max = 20; break; 5934 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5935 case SADB_X_AALG_SHA2_256: *min = *max = 32; break; 5936 case SADB_X_AALG_SHA2_384: *min = *max = 48; break; 5937 case SADB_X_AALG_SHA2_512: *min = *max = 64; break; 5938 default: 5939 DPRINTF(("%s: unknown AH algorithm %u\n", 5940 __func__, alg)); 5941 break; 5942 } 5943 } 5944 } 5945 5946 /* 5947 * XXX reorder combinations by preference 5948 */ 5949 static struct mbuf * 5950 key_getcomb_ah() 5951 { 5952 struct sadb_comb *comb; 5953 struct auth_hash *algo; 5954 struct mbuf *m; 5955 u_int16_t minkeysize, maxkeysize; 5956 int i; 5957 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5958 5959 m = NULL; 5960 for (i = 1; i <= SADB_AALG_MAX; i++) { 5961 #if 1 5962 /* we prefer HMAC algorithms, not old algorithms */ 5963 if (i != SADB_AALG_SHA1HMAC && 5964 i != SADB_AALG_MD5HMAC && 5965 i != SADB_X_AALG_SHA2_256 && 5966 i != SADB_X_AALG_SHA2_384 && 5967 i != SADB_X_AALG_SHA2_512) 5968 continue; 5969 #endif 5970 algo = ah_algorithm_lookup(i); 5971 if (!algo) 5972 continue; 5973 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5974 /* discard algorithms with key size smaller than system min */ 5975 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 5976 continue; 5977 5978 if (!m) { 5979 IPSEC_ASSERT(l <= MLEN, 5980 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5981 MGET(m, M_NOWAIT, MT_DATA); 5982 if (m) { 5983 M_ALIGN(m, l); 5984 m->m_len = l; 5985 m->m_next = NULL; 5986 } 5987 } else 5988 M_PREPEND(m, l, M_NOWAIT); 5989 if (!m) 5990 return NULL; 5991 5992 comb = mtod(m, struct sadb_comb *); 5993 bzero(comb, sizeof(*comb)); 5994 key_getcomb_setlifetime(comb); 5995 comb->sadb_comb_auth = i; 5996 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5997 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5998 } 5999 6000 return m; 6001 } 6002 6003 /* 6004 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 6005 * XXX reorder combinations by preference 6006 */ 6007 static struct mbuf * 6008 key_getcomb_ipcomp() 6009 { 6010 struct sadb_comb *comb; 6011 struct comp_algo *algo; 6012 struct mbuf *m; 6013 int i; 6014 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6015 6016 m = NULL; 6017 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 6018 algo = ipcomp_algorithm_lookup(i); 6019 if (!algo) 6020 continue; 6021 6022 if (!m) { 6023 IPSEC_ASSERT(l <= MLEN, 6024 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6025 MGET(m, M_NOWAIT, MT_DATA); 6026 if (m) { 6027 M_ALIGN(m, l); 6028 m->m_len = l; 6029 m->m_next = NULL; 6030 } 6031 } else 6032 M_PREPEND(m, l, M_NOWAIT); 6033 if (!m) 6034 return NULL; 6035 6036 comb = mtod(m, struct sadb_comb *); 6037 bzero(comb, sizeof(*comb)); 6038 key_getcomb_setlifetime(comb); 6039 comb->sadb_comb_encrypt = i; 6040 /* what should we set into sadb_comb_*_{min,max}bits? */ 6041 } 6042 6043 return m; 6044 } 6045 6046 /* 6047 * XXX no way to pass mode (transport/tunnel) to userland 6048 * XXX replay checking? 6049 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6050 */ 6051 static struct mbuf * 6052 key_getprop(const struct secasindex *saidx) 6053 { 6054 struct sadb_prop *prop; 6055 struct mbuf *m, *n; 6056 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6057 int totlen; 6058 6059 switch (saidx->proto) { 6060 case IPPROTO_ESP: 6061 m = key_getcomb_esp(); 6062 break; 6063 case IPPROTO_AH: 6064 m = key_getcomb_ah(); 6065 break; 6066 case IPPROTO_IPCOMP: 6067 m = key_getcomb_ipcomp(); 6068 break; 6069 default: 6070 return NULL; 6071 } 6072 6073 if (!m) 6074 return NULL; 6075 M_PREPEND(m, l, M_NOWAIT); 6076 if (!m) 6077 return NULL; 6078 6079 totlen = 0; 6080 for (n = m; n; n = n->m_next) 6081 totlen += n->m_len; 6082 6083 prop = mtod(m, struct sadb_prop *); 6084 bzero(prop, sizeof(*prop)); 6085 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6086 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6087 prop->sadb_prop_replay = 32; /* XXX */ 6088 6089 return m; 6090 } 6091 6092 /* 6093 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 6094 * send 6095 * <base, SA, address(SD), (address(P)), x_policy, 6096 * (identity(SD),) (sensitivity,) proposal> 6097 * to KMD, and expect to receive 6098 * <base> with SADB_ACQUIRE if error occured, 6099 * or 6100 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6101 * from KMD by PF_KEY. 6102 * 6103 * XXX x_policy is outside of RFC2367 (KAME extension). 6104 * XXX sensitivity is not supported. 6105 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6106 * see comment for key_getcomb_ipcomp(). 6107 * 6108 * OUT: 6109 * 0 : succeed 6110 * others: error number 6111 */ 6112 static int 6113 key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6114 { 6115 struct mbuf *result = NULL, *m; 6116 struct secacq *newacq; 6117 u_int8_t satype; 6118 int error = -1; 6119 u_int32_t seq; 6120 6121 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 6122 satype = key_proto2satype(saidx->proto); 6123 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 6124 6125 /* 6126 * We never do anything about acquirng SA. There is anather 6127 * solution that kernel blocks to send SADB_ACQUIRE message until 6128 * getting something message from IKEd. In later case, to be 6129 * managed with ACQUIRING list. 6130 */ 6131 /* Get an entry to check whether sending message or not. */ 6132 if ((newacq = key_getacq(saidx)) != NULL) { 6133 if (V_key_blockacq_count < newacq->count) { 6134 /* reset counter and do send message. */ 6135 newacq->count = 0; 6136 } else { 6137 /* increment counter and do nothing. */ 6138 newacq->count++; 6139 return 0; 6140 } 6141 } else { 6142 /* make new entry for blocking to send SADB_ACQUIRE. */ 6143 if ((newacq = key_newacq(saidx)) == NULL) 6144 return ENOBUFS; 6145 } 6146 6147 6148 seq = newacq->seq; 6149 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6150 if (!m) { 6151 error = ENOBUFS; 6152 goto fail; 6153 } 6154 result = m; 6155 6156 /* 6157 * No SADB_X_EXT_NAT_T_* here: we do not know 6158 * anything related to NAT-T at this time. 6159 */ 6160 6161 /* set sadb_address for saidx's. */ 6162 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6163 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6164 if (!m) { 6165 error = ENOBUFS; 6166 goto fail; 6167 } 6168 m_cat(result, m); 6169 6170 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6171 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6172 if (!m) { 6173 error = ENOBUFS; 6174 goto fail; 6175 } 6176 m_cat(result, m); 6177 6178 /* XXX proxy address (optional) */ 6179 6180 /* set sadb_x_policy */ 6181 if (sp) { 6182 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6183 if (!m) { 6184 error = ENOBUFS; 6185 goto fail; 6186 } 6187 m_cat(result, m); 6188 } 6189 6190 /* XXX identity (optional) */ 6191 #if 0 6192 if (idexttype && fqdn) { 6193 /* create identity extension (FQDN) */ 6194 struct sadb_ident *id; 6195 int fqdnlen; 6196 6197 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6198 id = (struct sadb_ident *)p; 6199 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6200 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6201 id->sadb_ident_exttype = idexttype; 6202 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6203 bcopy(fqdn, id + 1, fqdnlen); 6204 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6205 } 6206 6207 if (idexttype) { 6208 /* create identity extension (USERFQDN) */ 6209 struct sadb_ident *id; 6210 int userfqdnlen; 6211 6212 if (userfqdn) { 6213 /* +1 for terminating-NUL */ 6214 userfqdnlen = strlen(userfqdn) + 1; 6215 } else 6216 userfqdnlen = 0; 6217 id = (struct sadb_ident *)p; 6218 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6219 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6220 id->sadb_ident_exttype = idexttype; 6221 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6222 /* XXX is it correct? */ 6223 if (curproc && curproc->p_cred) 6224 id->sadb_ident_id = curproc->p_cred->p_ruid; 6225 if (userfqdn && userfqdnlen) 6226 bcopy(userfqdn, id + 1, userfqdnlen); 6227 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6228 } 6229 #endif 6230 6231 /* XXX sensitivity (optional) */ 6232 6233 /* create proposal/combination extension */ 6234 m = key_getprop(saidx); 6235 #if 0 6236 /* 6237 * spec conformant: always attach proposal/combination extension, 6238 * the problem is that we have no way to attach it for ipcomp, 6239 * due to the way sadb_comb is declared in RFC2367. 6240 */ 6241 if (!m) { 6242 error = ENOBUFS; 6243 goto fail; 6244 } 6245 m_cat(result, m); 6246 #else 6247 /* 6248 * outside of spec; make proposal/combination extension optional. 6249 */ 6250 if (m) 6251 m_cat(result, m); 6252 #endif 6253 6254 if ((result->m_flags & M_PKTHDR) == 0) { 6255 error = EINVAL; 6256 goto fail; 6257 } 6258 6259 if (result->m_len < sizeof(struct sadb_msg)) { 6260 result = m_pullup(result, sizeof(struct sadb_msg)); 6261 if (result == NULL) { 6262 error = ENOBUFS; 6263 goto fail; 6264 } 6265 } 6266 6267 result->m_pkthdr.len = 0; 6268 for (m = result; m; m = m->m_next) 6269 result->m_pkthdr.len += m->m_len; 6270 6271 mtod(result, struct sadb_msg *)->sadb_msg_len = 6272 PFKEY_UNIT64(result->m_pkthdr.len); 6273 6274 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6275 6276 fail: 6277 if (result) 6278 m_freem(result); 6279 return error; 6280 } 6281 6282 static struct secacq * 6283 key_newacq(const struct secasindex *saidx) 6284 { 6285 struct secacq *newacq; 6286 6287 /* get new entry */ 6288 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6289 if (newacq == NULL) { 6290 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6291 return NULL; 6292 } 6293 6294 /* copy secindex */ 6295 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 6296 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 6297 newacq->created = time_second; 6298 newacq->count = 0; 6299 6300 /* add to acqtree */ 6301 ACQ_LOCK(); 6302 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 6303 ACQ_UNLOCK(); 6304 6305 return newacq; 6306 } 6307 6308 static struct secacq * 6309 key_getacq(const struct secasindex *saidx) 6310 { 6311 struct secacq *acq; 6312 6313 ACQ_LOCK(); 6314 LIST_FOREACH(acq, &V_acqtree, chain) { 6315 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 6316 break; 6317 } 6318 ACQ_UNLOCK(); 6319 6320 return acq; 6321 } 6322 6323 static struct secacq * 6324 key_getacqbyseq(u_int32_t seq) 6325 { 6326 struct secacq *acq; 6327 6328 ACQ_LOCK(); 6329 LIST_FOREACH(acq, &V_acqtree, chain) { 6330 if (acq->seq == seq) 6331 break; 6332 } 6333 ACQ_UNLOCK(); 6334 6335 return acq; 6336 } 6337 6338 static struct secspacq * 6339 key_newspacq(struct secpolicyindex *spidx) 6340 { 6341 struct secspacq *acq; 6342 6343 /* get new entry */ 6344 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6345 if (acq == NULL) { 6346 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6347 return NULL; 6348 } 6349 6350 /* copy secindex */ 6351 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 6352 acq->created = time_second; 6353 acq->count = 0; 6354 6355 /* add to spacqtree */ 6356 SPACQ_LOCK(); 6357 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 6358 SPACQ_UNLOCK(); 6359 6360 return acq; 6361 } 6362 6363 static struct secspacq * 6364 key_getspacq(struct secpolicyindex *spidx) 6365 { 6366 struct secspacq *acq; 6367 6368 SPACQ_LOCK(); 6369 LIST_FOREACH(acq, &V_spacqtree, chain) { 6370 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 6371 /* NB: return holding spacq_lock */ 6372 return acq; 6373 } 6374 } 6375 SPACQ_UNLOCK(); 6376 6377 return NULL; 6378 } 6379 6380 /* 6381 * SADB_ACQUIRE processing, 6382 * in first situation, is receiving 6383 * <base> 6384 * from the ikmpd, and clear sequence of its secasvar entry. 6385 * 6386 * In second situation, is receiving 6387 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6388 * from a user land process, and return 6389 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6390 * to the socket. 6391 * 6392 * m will always be freed. 6393 */ 6394 static int 6395 key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 6396 { 6397 const struct sadb_address *src0, *dst0; 6398 struct secasindex saidx; 6399 struct secashead *sah; 6400 u_int16_t proto; 6401 int error; 6402 6403 IPSEC_ASSERT(so != NULL, ("null socket")); 6404 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6405 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6406 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6407 6408 /* 6409 * Error message from KMd. 6410 * We assume that if error was occured in IKEd, the length of PFKEY 6411 * message is equal to the size of sadb_msg structure. 6412 * We do not raise error even if error occured in this function. 6413 */ 6414 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6415 struct secacq *acq; 6416 6417 /* check sequence number */ 6418 if (mhp->msg->sadb_msg_seq == 0) { 6419 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6420 "number.\n", __func__)); 6421 m_freem(m); 6422 return 0; 6423 } 6424 6425 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6426 /* 6427 * the specified larval SA is already gone, or we got 6428 * a bogus sequence number. we can silently ignore it. 6429 */ 6430 m_freem(m); 6431 return 0; 6432 } 6433 6434 /* reset acq counter in order to deletion by timehander. */ 6435 acq->created = time_second; 6436 acq->count = 0; 6437 m_freem(m); 6438 return 0; 6439 } 6440 6441 /* 6442 * This message is from user land. 6443 */ 6444 6445 /* map satype to proto */ 6446 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6447 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6448 __func__)); 6449 return key_senderror(so, m, EINVAL); 6450 } 6451 6452 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6453 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6454 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6455 /* error */ 6456 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6457 __func__)); 6458 return key_senderror(so, m, EINVAL); 6459 } 6460 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6461 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6462 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6463 /* error */ 6464 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6465 __func__)); 6466 return key_senderror(so, m, EINVAL); 6467 } 6468 6469 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6470 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6471 6472 /* XXX boundary check against sa_len */ 6473 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6474 6475 /* 6476 * Make sure the port numbers are zero. 6477 * In case of NAT-T we will update them later if needed. 6478 */ 6479 KEY_PORTTOSADDR(&saidx.src, 0); 6480 KEY_PORTTOSADDR(&saidx.dst, 0); 6481 6482 #ifndef IPSEC_NAT_T 6483 /* 6484 * Handle NAT-T info if present. 6485 */ 6486 6487 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 6488 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 6489 struct sadb_x_nat_t_port *sport, *dport; 6490 6491 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 6492 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 6493 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 6494 __func__)); 6495 return key_senderror(so, m, EINVAL); 6496 } 6497 6498 sport = (struct sadb_x_nat_t_port *) 6499 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 6500 dport = (struct sadb_x_nat_t_port *) 6501 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 6502 6503 if (sport) 6504 KEY_PORTTOSADDR(&saidx.src, 6505 sport->sadb_x_nat_t_port_port); 6506 if (dport) 6507 KEY_PORTTOSADDR(&saidx.dst, 6508 dport->sadb_x_nat_t_port_port); 6509 } 6510 #endif 6511 6512 /* get a SA index */ 6513 SAHTREE_LOCK(); 6514 LIST_FOREACH(sah, &V_sahtree, chain) { 6515 if (sah->state == SADB_SASTATE_DEAD) 6516 continue; 6517 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6518 break; 6519 } 6520 SAHTREE_UNLOCK(); 6521 if (sah != NULL) { 6522 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6523 return key_senderror(so, m, EEXIST); 6524 } 6525 6526 error = key_acquire(&saidx, NULL); 6527 if (error != 0) { 6528 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6529 __func__, mhp->msg->sadb_msg_errno)); 6530 return key_senderror(so, m, error); 6531 } 6532 6533 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6534 } 6535 6536 /* 6537 * SADB_REGISTER processing. 6538 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6539 * receive 6540 * <base> 6541 * from the ikmpd, and register a socket to send PF_KEY messages, 6542 * and send 6543 * <base, supported> 6544 * to KMD by PF_KEY. 6545 * If socket is detached, must free from regnode. 6546 * 6547 * m will always be freed. 6548 */ 6549 static int 6550 key_register(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 6551 { 6552 struct secreg *reg, *newreg = 0; 6553 6554 IPSEC_ASSERT(so != NULL, ("null socket")); 6555 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6556 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6557 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6558 6559 /* check for invalid register message */ 6560 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6561 return key_senderror(so, m, EINVAL); 6562 6563 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6564 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6565 goto setmsg; 6566 6567 /* check whether existing or not */ 6568 REGTREE_LOCK(); 6569 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6570 if (reg->so == so) { 6571 REGTREE_UNLOCK(); 6572 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6573 __func__)); 6574 return key_senderror(so, m, EEXIST); 6575 } 6576 } 6577 6578 /* create regnode */ 6579 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6580 if (newreg == NULL) { 6581 REGTREE_UNLOCK(); 6582 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6583 return key_senderror(so, m, ENOBUFS); 6584 } 6585 6586 newreg->so = so; 6587 ((struct keycb *)sotorawcb(so))->kp_registered++; 6588 6589 /* add regnode to regtree. */ 6590 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6591 REGTREE_UNLOCK(); 6592 6593 setmsg: 6594 { 6595 struct mbuf *n; 6596 struct sadb_msg *newmsg; 6597 struct sadb_supported *sup; 6598 u_int len, alen, elen; 6599 int off; 6600 int i; 6601 struct sadb_alg *alg; 6602 6603 /* create new sadb_msg to reply. */ 6604 alen = 0; 6605 for (i = 1; i <= SADB_AALG_MAX; i++) { 6606 if (ah_algorithm_lookup(i)) 6607 alen += sizeof(struct sadb_alg); 6608 } 6609 if (alen) 6610 alen += sizeof(struct sadb_supported); 6611 elen = 0; 6612 for (i = 1; i <= SADB_EALG_MAX; i++) { 6613 if (esp_algorithm_lookup(i)) 6614 elen += sizeof(struct sadb_alg); 6615 } 6616 if (elen) 6617 elen += sizeof(struct sadb_supported); 6618 6619 len = sizeof(struct sadb_msg) + alen + elen; 6620 6621 if (len > MCLBYTES) 6622 return key_senderror(so, m, ENOBUFS); 6623 6624 MGETHDR(n, M_NOWAIT, MT_DATA); 6625 if (len > MHLEN) { 6626 if (!(MCLGET(n, M_NOWAIT))) { 6627 m_freem(n); 6628 n = NULL; 6629 } 6630 } 6631 if (!n) 6632 return key_senderror(so, m, ENOBUFS); 6633 6634 n->m_pkthdr.len = n->m_len = len; 6635 n->m_next = NULL; 6636 off = 0; 6637 6638 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6639 newmsg = mtod(n, struct sadb_msg *); 6640 newmsg->sadb_msg_errno = 0; 6641 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6642 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6643 6644 /* for authentication algorithm */ 6645 if (alen) { 6646 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6647 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6648 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6649 off += PFKEY_ALIGN8(sizeof(*sup)); 6650 6651 for (i = 1; i <= SADB_AALG_MAX; i++) { 6652 struct auth_hash *aalgo; 6653 u_int16_t minkeysize, maxkeysize; 6654 6655 aalgo = ah_algorithm_lookup(i); 6656 if (!aalgo) 6657 continue; 6658 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6659 alg->sadb_alg_id = i; 6660 alg->sadb_alg_ivlen = 0; 6661 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6662 alg->sadb_alg_minbits = _BITS(minkeysize); 6663 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6664 off += PFKEY_ALIGN8(sizeof(*alg)); 6665 } 6666 } 6667 6668 /* for encryption algorithm */ 6669 if (elen) { 6670 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6671 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6672 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6673 off += PFKEY_ALIGN8(sizeof(*sup)); 6674 6675 for (i = 1; i <= SADB_EALG_MAX; i++) { 6676 struct enc_xform *ealgo; 6677 6678 ealgo = esp_algorithm_lookup(i); 6679 if (!ealgo) 6680 continue; 6681 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6682 alg->sadb_alg_id = i; 6683 alg->sadb_alg_ivlen = ealgo->blocksize; 6684 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6685 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6686 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6687 } 6688 } 6689 6690 IPSEC_ASSERT(off == len, 6691 ("length assumption failed (off %u len %u)", off, len)); 6692 6693 m_freem(m); 6694 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6695 } 6696 } 6697 6698 /* 6699 * free secreg entry registered. 6700 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6701 */ 6702 void 6703 key_freereg(struct socket *so) 6704 { 6705 struct secreg *reg; 6706 int i; 6707 6708 IPSEC_ASSERT(so != NULL, ("NULL so")); 6709 6710 /* 6711 * check whether existing or not. 6712 * check all type of SA, because there is a potential that 6713 * one socket is registered to multiple type of SA. 6714 */ 6715 REGTREE_LOCK(); 6716 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6717 LIST_FOREACH(reg, &V_regtree[i], chain) { 6718 if (reg->so == so && __LIST_CHAINED(reg)) { 6719 LIST_REMOVE(reg, chain); 6720 free(reg, M_IPSEC_SAR); 6721 break; 6722 } 6723 } 6724 } 6725 REGTREE_UNLOCK(); 6726 } 6727 6728 /* 6729 * SADB_EXPIRE processing 6730 * send 6731 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6732 * to KMD by PF_KEY. 6733 * NOTE: We send only soft lifetime extension. 6734 * 6735 * OUT: 0 : succeed 6736 * others : error number 6737 */ 6738 static int 6739 key_expire(struct secasvar *sav) 6740 { 6741 int satype; 6742 struct mbuf *result = NULL, *m; 6743 int len; 6744 int error = -1; 6745 struct sadb_lifetime *lt; 6746 6747 IPSEC_ASSERT (sav != NULL, ("null sav")); 6748 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6749 6750 /* set msg header */ 6751 satype = key_proto2satype(sav->sah->saidx.proto); 6752 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6753 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6754 if (!m) { 6755 error = ENOBUFS; 6756 goto fail; 6757 } 6758 result = m; 6759 6760 /* create SA extension */ 6761 m = key_setsadbsa(sav); 6762 if (!m) { 6763 error = ENOBUFS; 6764 goto fail; 6765 } 6766 m_cat(result, m); 6767 6768 /* create SA extension */ 6769 m = key_setsadbxsa2(sav->sah->saidx.mode, 6770 sav->replay ? sav->replay->count : 0, 6771 sav->sah->saidx.reqid); 6772 if (!m) { 6773 error = ENOBUFS; 6774 goto fail; 6775 } 6776 m_cat(result, m); 6777 6778 /* create lifetime extension (current and soft) */ 6779 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6780 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 6781 if (m == NULL) { 6782 error = ENOBUFS; 6783 goto fail; 6784 } 6785 m_align(m, len); 6786 m->m_len = len; 6787 bzero(mtod(m, caddr_t), len); 6788 lt = mtod(m, struct sadb_lifetime *); 6789 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6790 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6791 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6792 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6793 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6794 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6795 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6796 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6797 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6798 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6799 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6800 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6801 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6802 m_cat(result, m); 6803 6804 /* set sadb_address for source */ 6805 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6806 &sav->sah->saidx.src.sa, 6807 FULLMASK, IPSEC_ULPROTO_ANY); 6808 if (!m) { 6809 error = ENOBUFS; 6810 goto fail; 6811 } 6812 m_cat(result, m); 6813 6814 /* set sadb_address for destination */ 6815 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6816 &sav->sah->saidx.dst.sa, 6817 FULLMASK, IPSEC_ULPROTO_ANY); 6818 if (!m) { 6819 error = ENOBUFS; 6820 goto fail; 6821 } 6822 m_cat(result, m); 6823 6824 /* 6825 * XXX-BZ Handle NAT-T extensions here. 6826 */ 6827 6828 if ((result->m_flags & M_PKTHDR) == 0) { 6829 error = EINVAL; 6830 goto fail; 6831 } 6832 6833 if (result->m_len < sizeof(struct sadb_msg)) { 6834 result = m_pullup(result, sizeof(struct sadb_msg)); 6835 if (result == NULL) { 6836 error = ENOBUFS; 6837 goto fail; 6838 } 6839 } 6840 6841 result->m_pkthdr.len = 0; 6842 for (m = result; m; m = m->m_next) 6843 result->m_pkthdr.len += m->m_len; 6844 6845 mtod(result, struct sadb_msg *)->sadb_msg_len = 6846 PFKEY_UNIT64(result->m_pkthdr.len); 6847 6848 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6849 6850 fail: 6851 if (result) 6852 m_freem(result); 6853 return error; 6854 } 6855 6856 /* 6857 * SADB_FLUSH processing 6858 * receive 6859 * <base> 6860 * from the ikmpd, and free all entries in secastree. 6861 * and send, 6862 * <base> 6863 * to the ikmpd. 6864 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6865 * 6866 * m will always be freed. 6867 */ 6868 static int 6869 key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 6870 { 6871 struct sadb_msg *newmsg; 6872 struct secashead *sah, *nextsah; 6873 struct secasvar *sav, *nextsav; 6874 u_int16_t proto; 6875 u_int8_t state; 6876 u_int stateidx; 6877 6878 IPSEC_ASSERT(so != NULL, ("null socket")); 6879 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6880 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6881 6882 /* map satype to proto */ 6883 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6884 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6885 __func__)); 6886 return key_senderror(so, m, EINVAL); 6887 } 6888 6889 /* no SATYPE specified, i.e. flushing all SA. */ 6890 SAHTREE_LOCK(); 6891 for (sah = LIST_FIRST(&V_sahtree); 6892 sah != NULL; 6893 sah = nextsah) { 6894 nextsah = LIST_NEXT(sah, chain); 6895 6896 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6897 && proto != sah->saidx.proto) 6898 continue; 6899 6900 for (stateidx = 0; 6901 stateidx < _ARRAYLEN(saorder_state_alive); 6902 stateidx++) { 6903 state = saorder_state_any[stateidx]; 6904 for (sav = LIST_FIRST(&sah->savtree[state]); 6905 sav != NULL; 6906 sav = nextsav) { 6907 6908 nextsav = LIST_NEXT(sav, chain); 6909 6910 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6911 KEY_FREESAV(&sav); 6912 } 6913 } 6914 6915 sah->state = SADB_SASTATE_DEAD; 6916 } 6917 SAHTREE_UNLOCK(); 6918 6919 if (m->m_len < sizeof(struct sadb_msg) || 6920 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6921 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6922 return key_senderror(so, m, ENOBUFS); 6923 } 6924 6925 if (m->m_next) 6926 m_freem(m->m_next); 6927 m->m_next = NULL; 6928 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6929 newmsg = mtod(m, struct sadb_msg *); 6930 newmsg->sadb_msg_errno = 0; 6931 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6932 6933 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6934 } 6935 6936 /* 6937 * SADB_DUMP processing 6938 * dump all entries including status of DEAD in SAD. 6939 * receive 6940 * <base> 6941 * from the ikmpd, and dump all secasvar leaves 6942 * and send, 6943 * <base> ..... 6944 * to the ikmpd. 6945 * 6946 * m will always be freed. 6947 */ 6948 static int 6949 key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 6950 { 6951 struct secashead *sah; 6952 struct secasvar *sav; 6953 u_int16_t proto; 6954 u_int stateidx; 6955 u_int8_t satype; 6956 u_int8_t state; 6957 int cnt; 6958 struct sadb_msg *newmsg; 6959 struct mbuf *n; 6960 6961 IPSEC_ASSERT(so != NULL, ("null socket")); 6962 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6963 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6964 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6965 6966 /* map satype to proto */ 6967 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6968 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6969 __func__)); 6970 return key_senderror(so, m, EINVAL); 6971 } 6972 6973 /* count sav entries to be sent to the userland. */ 6974 cnt = 0; 6975 SAHTREE_LOCK(); 6976 LIST_FOREACH(sah, &V_sahtree, chain) { 6977 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6978 && proto != sah->saidx.proto) 6979 continue; 6980 6981 for (stateidx = 0; 6982 stateidx < _ARRAYLEN(saorder_state_any); 6983 stateidx++) { 6984 state = saorder_state_any[stateidx]; 6985 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6986 cnt++; 6987 } 6988 } 6989 } 6990 6991 if (cnt == 0) { 6992 SAHTREE_UNLOCK(); 6993 return key_senderror(so, m, ENOENT); 6994 } 6995 6996 /* send this to the userland, one at a time. */ 6997 newmsg = NULL; 6998 LIST_FOREACH(sah, &V_sahtree, chain) { 6999 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7000 && proto != sah->saidx.proto) 7001 continue; 7002 7003 /* map proto to satype */ 7004 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 7005 SAHTREE_UNLOCK(); 7006 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 7007 "SAD.\n", __func__)); 7008 return key_senderror(so, m, EINVAL); 7009 } 7010 7011 for (stateidx = 0; 7012 stateidx < _ARRAYLEN(saorder_state_any); 7013 stateidx++) { 7014 state = saorder_state_any[stateidx]; 7015 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7016 n = key_setdumpsa(sav, SADB_DUMP, satype, 7017 --cnt, mhp->msg->sadb_msg_pid); 7018 if (!n) { 7019 SAHTREE_UNLOCK(); 7020 return key_senderror(so, m, ENOBUFS); 7021 } 7022 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 7023 } 7024 } 7025 } 7026 SAHTREE_UNLOCK(); 7027 7028 m_freem(m); 7029 return 0; 7030 } 7031 7032 /* 7033 * SADB_X_PROMISC processing 7034 * 7035 * m will always be freed. 7036 */ 7037 static int 7038 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 7039 { 7040 int olen; 7041 7042 IPSEC_ASSERT(so != NULL, ("null socket")); 7043 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7044 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7045 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7046 7047 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7048 7049 if (olen < sizeof(struct sadb_msg)) { 7050 #if 1 7051 return key_senderror(so, m, EINVAL); 7052 #else 7053 m_freem(m); 7054 return 0; 7055 #endif 7056 } else if (olen == sizeof(struct sadb_msg)) { 7057 /* enable/disable promisc mode */ 7058 struct keycb *kp; 7059 7060 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 7061 return key_senderror(so, m, EINVAL); 7062 mhp->msg->sadb_msg_errno = 0; 7063 switch (mhp->msg->sadb_msg_satype) { 7064 case 0: 7065 case 1: 7066 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7067 break; 7068 default: 7069 return key_senderror(so, m, EINVAL); 7070 } 7071 7072 /* send the original message back to everyone */ 7073 mhp->msg->sadb_msg_errno = 0; 7074 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7075 } else { 7076 /* send packet as is */ 7077 7078 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7079 7080 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7081 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7082 } 7083 } 7084 7085 static int (*key_typesw[])(struct socket *, struct mbuf *, 7086 const struct sadb_msghdr *) = { 7087 NULL, /* SADB_RESERVED */ 7088 key_getspi, /* SADB_GETSPI */ 7089 key_update, /* SADB_UPDATE */ 7090 key_add, /* SADB_ADD */ 7091 key_delete, /* SADB_DELETE */ 7092 key_get, /* SADB_GET */ 7093 key_acquire2, /* SADB_ACQUIRE */ 7094 key_register, /* SADB_REGISTER */ 7095 NULL, /* SADB_EXPIRE */ 7096 key_flush, /* SADB_FLUSH */ 7097 key_dump, /* SADB_DUMP */ 7098 key_promisc, /* SADB_X_PROMISC */ 7099 NULL, /* SADB_X_PCHANGE */ 7100 key_spdadd, /* SADB_X_SPDUPDATE */ 7101 key_spdadd, /* SADB_X_SPDADD */ 7102 key_spddelete, /* SADB_X_SPDDELETE */ 7103 key_spdget, /* SADB_X_SPDGET */ 7104 NULL, /* SADB_X_SPDACQUIRE */ 7105 key_spddump, /* SADB_X_SPDDUMP */ 7106 key_spdflush, /* SADB_X_SPDFLUSH */ 7107 key_spdadd, /* SADB_X_SPDSETIDX */ 7108 NULL, /* SADB_X_SPDEXPIRE */ 7109 key_spddelete2, /* SADB_X_SPDDELETE2 */ 7110 }; 7111 7112 /* 7113 * parse sadb_msg buffer to process PFKEYv2, 7114 * and create a data to response if needed. 7115 * I think to be dealed with mbuf directly. 7116 * IN: 7117 * msgp : pointer to pointer to a received buffer pulluped. 7118 * This is rewrited to response. 7119 * so : pointer to socket. 7120 * OUT: 7121 * length for buffer to send to user process. 7122 */ 7123 int 7124 key_parse(struct mbuf *m, struct socket *so) 7125 { 7126 struct sadb_msg *msg; 7127 struct sadb_msghdr mh; 7128 u_int orglen; 7129 int error; 7130 int target; 7131 7132 IPSEC_ASSERT(so != NULL, ("null socket")); 7133 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7134 7135 #if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7136 KEYDEBUG(KEYDEBUG_KEY_DUMP, 7137 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 7138 kdebug_sadb(msg)); 7139 #endif 7140 7141 if (m->m_len < sizeof(struct sadb_msg)) { 7142 m = m_pullup(m, sizeof(struct sadb_msg)); 7143 if (!m) 7144 return ENOBUFS; 7145 } 7146 msg = mtod(m, struct sadb_msg *); 7147 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7148 target = KEY_SENDUP_ONE; 7149 7150 if ((m->m_flags & M_PKTHDR) == 0 || 7151 m->m_pkthdr.len != m->m_pkthdr.len) { 7152 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 7153 PFKEYSTAT_INC(out_invlen); 7154 error = EINVAL; 7155 goto senderror; 7156 } 7157 7158 if (msg->sadb_msg_version != PF_KEY_V2) { 7159 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 7160 __func__, msg->sadb_msg_version)); 7161 PFKEYSTAT_INC(out_invver); 7162 error = EINVAL; 7163 goto senderror; 7164 } 7165 7166 if (msg->sadb_msg_type > SADB_MAX) { 7167 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7168 __func__, msg->sadb_msg_type)); 7169 PFKEYSTAT_INC(out_invmsgtype); 7170 error = EINVAL; 7171 goto senderror; 7172 } 7173 7174 /* for old-fashioned code - should be nuked */ 7175 if (m->m_pkthdr.len > MCLBYTES) { 7176 m_freem(m); 7177 return ENOBUFS; 7178 } 7179 if (m->m_next) { 7180 struct mbuf *n; 7181 7182 MGETHDR(n, M_NOWAIT, MT_DATA); 7183 if (n && m->m_pkthdr.len > MHLEN) { 7184 if (!(MCLGET(n, M_NOWAIT))) { 7185 m_free(n); 7186 n = NULL; 7187 } 7188 } 7189 if (!n) { 7190 m_freem(m); 7191 return ENOBUFS; 7192 } 7193 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 7194 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7195 n->m_next = NULL; 7196 m_freem(m); 7197 m = n; 7198 } 7199 7200 /* align the mbuf chain so that extensions are in contiguous region. */ 7201 error = key_align(m, &mh); 7202 if (error) 7203 return error; 7204 7205 msg = mh.msg; 7206 7207 /* check SA type */ 7208 switch (msg->sadb_msg_satype) { 7209 case SADB_SATYPE_UNSPEC: 7210 switch (msg->sadb_msg_type) { 7211 case SADB_GETSPI: 7212 case SADB_UPDATE: 7213 case SADB_ADD: 7214 case SADB_DELETE: 7215 case SADB_GET: 7216 case SADB_ACQUIRE: 7217 case SADB_EXPIRE: 7218 ipseclog((LOG_DEBUG, "%s: must specify satype " 7219 "when msg type=%u.\n", __func__, 7220 msg->sadb_msg_type)); 7221 PFKEYSTAT_INC(out_invsatype); 7222 error = EINVAL; 7223 goto senderror; 7224 } 7225 break; 7226 case SADB_SATYPE_AH: 7227 case SADB_SATYPE_ESP: 7228 case SADB_X_SATYPE_IPCOMP: 7229 case SADB_X_SATYPE_TCPSIGNATURE: 7230 switch (msg->sadb_msg_type) { 7231 case SADB_X_SPDADD: 7232 case SADB_X_SPDDELETE: 7233 case SADB_X_SPDGET: 7234 case SADB_X_SPDDUMP: 7235 case SADB_X_SPDFLUSH: 7236 case SADB_X_SPDSETIDX: 7237 case SADB_X_SPDUPDATE: 7238 case SADB_X_SPDDELETE2: 7239 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 7240 __func__, msg->sadb_msg_type)); 7241 PFKEYSTAT_INC(out_invsatype); 7242 error = EINVAL; 7243 goto senderror; 7244 } 7245 break; 7246 case SADB_SATYPE_RSVP: 7247 case SADB_SATYPE_OSPFV2: 7248 case SADB_SATYPE_RIPV2: 7249 case SADB_SATYPE_MIP: 7250 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 7251 __func__, msg->sadb_msg_satype)); 7252 PFKEYSTAT_INC(out_invsatype); 7253 error = EOPNOTSUPP; 7254 goto senderror; 7255 case 1: /* XXX: What does it do? */ 7256 if (msg->sadb_msg_type == SADB_X_PROMISC) 7257 break; 7258 /*FALLTHROUGH*/ 7259 default: 7260 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7261 __func__, msg->sadb_msg_satype)); 7262 PFKEYSTAT_INC(out_invsatype); 7263 error = EINVAL; 7264 goto senderror; 7265 } 7266 7267 /* check field of upper layer protocol and address family */ 7268 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 7269 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7270 struct sadb_address *src0, *dst0; 7271 u_int plen; 7272 7273 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7274 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7275 7276 /* check upper layer protocol */ 7277 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7278 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 7279 "mismatched.\n", __func__)); 7280 PFKEYSTAT_INC(out_invaddr); 7281 error = EINVAL; 7282 goto senderror; 7283 } 7284 7285 /* check family */ 7286 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7287 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7288 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 7289 __func__)); 7290 PFKEYSTAT_INC(out_invaddr); 7291 error = EINVAL; 7292 goto senderror; 7293 } 7294 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7295 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7296 ipseclog((LOG_DEBUG, "%s: address struct size " 7297 "mismatched.\n", __func__)); 7298 PFKEYSTAT_INC(out_invaddr); 7299 error = EINVAL; 7300 goto senderror; 7301 } 7302 7303 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7304 case AF_INET: 7305 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7306 sizeof(struct sockaddr_in)) { 7307 PFKEYSTAT_INC(out_invaddr); 7308 error = EINVAL; 7309 goto senderror; 7310 } 7311 break; 7312 case AF_INET6: 7313 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7314 sizeof(struct sockaddr_in6)) { 7315 PFKEYSTAT_INC(out_invaddr); 7316 error = EINVAL; 7317 goto senderror; 7318 } 7319 break; 7320 default: 7321 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 7322 __func__)); 7323 PFKEYSTAT_INC(out_invaddr); 7324 error = EAFNOSUPPORT; 7325 goto senderror; 7326 } 7327 7328 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7329 case AF_INET: 7330 plen = sizeof(struct in_addr) << 3; 7331 break; 7332 case AF_INET6: 7333 plen = sizeof(struct in6_addr) << 3; 7334 break; 7335 default: 7336 plen = 0; /*fool gcc*/ 7337 break; 7338 } 7339 7340 /* check max prefix length */ 7341 if (src0->sadb_address_prefixlen > plen || 7342 dst0->sadb_address_prefixlen > plen) { 7343 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 7344 __func__)); 7345 PFKEYSTAT_INC(out_invaddr); 7346 error = EINVAL; 7347 goto senderror; 7348 } 7349 7350 /* 7351 * prefixlen == 0 is valid because there can be a case when 7352 * all addresses are matched. 7353 */ 7354 } 7355 7356 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 7357 key_typesw[msg->sadb_msg_type] == NULL) { 7358 PFKEYSTAT_INC(out_invmsgtype); 7359 error = EINVAL; 7360 goto senderror; 7361 } 7362 7363 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 7364 7365 senderror: 7366 msg->sadb_msg_errno = error; 7367 return key_sendup_mbuf(so, m, target); 7368 } 7369 7370 static int 7371 key_senderror(struct socket *so, struct mbuf *m, int code) 7372 { 7373 struct sadb_msg *msg; 7374 7375 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7376 ("mbuf too small, len %u", m->m_len)); 7377 7378 msg = mtod(m, struct sadb_msg *); 7379 msg->sadb_msg_errno = code; 7380 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7381 } 7382 7383 /* 7384 * set the pointer to each header into message buffer. 7385 * m will be freed on error. 7386 * XXX larger-than-MCLBYTES extension? 7387 */ 7388 static int 7389 key_align(struct mbuf *m, struct sadb_msghdr *mhp) 7390 { 7391 struct mbuf *n; 7392 struct sadb_ext *ext; 7393 size_t off, end; 7394 int extlen; 7395 int toff; 7396 7397 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7398 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7399 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7400 ("mbuf too small, len %u", m->m_len)); 7401 7402 /* initialize */ 7403 bzero(mhp, sizeof(*mhp)); 7404 7405 mhp->msg = mtod(m, struct sadb_msg *); 7406 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7407 7408 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7409 extlen = end; /*just in case extlen is not updated*/ 7410 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7411 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7412 if (!n) { 7413 /* m is already freed */ 7414 return ENOBUFS; 7415 } 7416 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7417 7418 /* set pointer */ 7419 switch (ext->sadb_ext_type) { 7420 case SADB_EXT_SA: 7421 case SADB_EXT_ADDRESS_SRC: 7422 case SADB_EXT_ADDRESS_DST: 7423 case SADB_EXT_ADDRESS_PROXY: 7424 case SADB_EXT_LIFETIME_CURRENT: 7425 case SADB_EXT_LIFETIME_HARD: 7426 case SADB_EXT_LIFETIME_SOFT: 7427 case SADB_EXT_KEY_AUTH: 7428 case SADB_EXT_KEY_ENCRYPT: 7429 case SADB_EXT_IDENTITY_SRC: 7430 case SADB_EXT_IDENTITY_DST: 7431 case SADB_EXT_SENSITIVITY: 7432 case SADB_EXT_PROPOSAL: 7433 case SADB_EXT_SUPPORTED_AUTH: 7434 case SADB_EXT_SUPPORTED_ENCRYPT: 7435 case SADB_EXT_SPIRANGE: 7436 case SADB_X_EXT_POLICY: 7437 case SADB_X_EXT_SA2: 7438 #ifdef IPSEC_NAT_T 7439 case SADB_X_EXT_NAT_T_TYPE: 7440 case SADB_X_EXT_NAT_T_SPORT: 7441 case SADB_X_EXT_NAT_T_DPORT: 7442 case SADB_X_EXT_NAT_T_OAI: 7443 case SADB_X_EXT_NAT_T_OAR: 7444 case SADB_X_EXT_NAT_T_FRAG: 7445 #endif 7446 /* duplicate check */ 7447 /* 7448 * XXX Are there duplication payloads of either 7449 * KEY_AUTH or KEY_ENCRYPT ? 7450 */ 7451 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7452 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7453 "%u\n", __func__, ext->sadb_ext_type)); 7454 m_freem(m); 7455 PFKEYSTAT_INC(out_dupext); 7456 return EINVAL; 7457 } 7458 break; 7459 default: 7460 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7461 __func__, ext->sadb_ext_type)); 7462 m_freem(m); 7463 PFKEYSTAT_INC(out_invexttype); 7464 return EINVAL; 7465 } 7466 7467 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7468 7469 if (key_validate_ext(ext, extlen)) { 7470 m_freem(m); 7471 PFKEYSTAT_INC(out_invlen); 7472 return EINVAL; 7473 } 7474 7475 n = m_pulldown(m, off, extlen, &toff); 7476 if (!n) { 7477 /* m is already freed */ 7478 return ENOBUFS; 7479 } 7480 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7481 7482 mhp->ext[ext->sadb_ext_type] = ext; 7483 mhp->extoff[ext->sadb_ext_type] = off; 7484 mhp->extlen[ext->sadb_ext_type] = extlen; 7485 } 7486 7487 if (off != end) { 7488 m_freem(m); 7489 PFKEYSTAT_INC(out_invlen); 7490 return EINVAL; 7491 } 7492 7493 return 0; 7494 } 7495 7496 static int 7497 key_validate_ext(const struct sadb_ext *ext, int len) 7498 { 7499 const struct sockaddr *sa; 7500 enum { NONE, ADDR } checktype = NONE; 7501 int baselen = 0; 7502 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7503 7504 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7505 return EINVAL; 7506 7507 /* if it does not match minimum/maximum length, bail */ 7508 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7509 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7510 return EINVAL; 7511 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7512 return EINVAL; 7513 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7514 return EINVAL; 7515 7516 /* more checks based on sadb_ext_type XXX need more */ 7517 switch (ext->sadb_ext_type) { 7518 case SADB_EXT_ADDRESS_SRC: 7519 case SADB_EXT_ADDRESS_DST: 7520 case SADB_EXT_ADDRESS_PROXY: 7521 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7522 checktype = ADDR; 7523 break; 7524 case SADB_EXT_IDENTITY_SRC: 7525 case SADB_EXT_IDENTITY_DST: 7526 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7527 SADB_X_IDENTTYPE_ADDR) { 7528 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7529 checktype = ADDR; 7530 } else 7531 checktype = NONE; 7532 break; 7533 default: 7534 checktype = NONE; 7535 break; 7536 } 7537 7538 switch (checktype) { 7539 case NONE: 7540 break; 7541 case ADDR: 7542 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7543 if (len < baselen + sal) 7544 return EINVAL; 7545 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7546 return EINVAL; 7547 break; 7548 } 7549 7550 return 0; 7551 } 7552 7553 void 7554 key_init(void) 7555 { 7556 int i; 7557 7558 for (i = 0; i < IPSEC_DIR_MAX; i++) 7559 TAILQ_INIT(&V_sptree[i]); 7560 7561 LIST_INIT(&V_sahtree); 7562 7563 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7564 LIST_INIT(&V_regtree[i]); 7565 7566 LIST_INIT(&V_acqtree); 7567 LIST_INIT(&V_spacqtree); 7568 7569 if (!IS_DEFAULT_VNET(curvnet)) 7570 return; 7571 7572 SPTREE_LOCK_INIT(); 7573 REGTREE_LOCK_INIT(); 7574 SAHTREE_LOCK_INIT(); 7575 ACQ_LOCK_INIT(); 7576 SPACQ_LOCK_INIT(); 7577 7578 #ifndef IPSEC_DEBUG2 7579 callout_init(&key_timer, CALLOUT_MPSAFE); 7580 callout_reset(&key_timer, hz, key_timehandler, NULL); 7581 #endif /*IPSEC_DEBUG2*/ 7582 7583 /* initialize key statistics */ 7584 keystat.getspi_count = 1; 7585 7586 printf("IPsec: Initialized Security Association Processing.\n"); 7587 } 7588 7589 #ifdef VIMAGE 7590 void 7591 key_destroy(void) 7592 { 7593 TAILQ_HEAD(, secpolicy) drainq; 7594 struct secpolicy *sp, *nextsp; 7595 struct secacq *acq, *nextacq; 7596 struct secspacq *spacq, *nextspacq; 7597 struct secashead *sah, *nextsah; 7598 struct secreg *reg; 7599 int i; 7600 7601 TAILQ_INIT(&drainq); 7602 SPTREE_WLOCK(); 7603 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7604 TAILQ_CONCAT(&drainq, &V_sptree[i], chain); 7605 } 7606 SPTREE_WUNLOCK(); 7607 sp = TAILQ_FIRST(&drainq); 7608 while (sp != NULL) { 7609 nextsp = TAILQ_NEXT(sp, chain); 7610 KEY_FREESP(&sp); 7611 sp = nextsp; 7612 } 7613 7614 SAHTREE_LOCK(); 7615 for (sah = LIST_FIRST(&V_sahtree); sah != NULL; sah = nextsah) { 7616 nextsah = LIST_NEXT(sah, chain); 7617 if (__LIST_CHAINED(sah)) { 7618 LIST_REMOVE(sah, chain); 7619 free(sah, M_IPSEC_SAH); 7620 } 7621 } 7622 SAHTREE_UNLOCK(); 7623 7624 REGTREE_LOCK(); 7625 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7626 LIST_FOREACH(reg, &V_regtree[i], chain) { 7627 if (__LIST_CHAINED(reg)) { 7628 LIST_REMOVE(reg, chain); 7629 free(reg, M_IPSEC_SAR); 7630 break; 7631 } 7632 } 7633 } 7634 REGTREE_UNLOCK(); 7635 7636 ACQ_LOCK(); 7637 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 7638 nextacq = LIST_NEXT(acq, chain); 7639 if (__LIST_CHAINED(acq)) { 7640 LIST_REMOVE(acq, chain); 7641 free(acq, M_IPSEC_SAQ); 7642 } 7643 } 7644 ACQ_UNLOCK(); 7645 7646 SPACQ_LOCK(); 7647 for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL; 7648 spacq = nextspacq) { 7649 nextspacq = LIST_NEXT(spacq, chain); 7650 if (__LIST_CHAINED(spacq)) { 7651 LIST_REMOVE(spacq, chain); 7652 free(spacq, M_IPSEC_SAQ); 7653 } 7654 } 7655 SPACQ_UNLOCK(); 7656 } 7657 #endif 7658 7659 /* 7660 * XXX: maybe This function is called after INBOUND IPsec processing. 7661 * 7662 * Special check for tunnel-mode packets. 7663 * We must make some checks for consistency between inner and outer IP header. 7664 * 7665 * xxx more checks to be provided 7666 */ 7667 int 7668 key_checktunnelsanity(struct secasvar *sav, u_int family, caddr_t src, 7669 caddr_t dst) 7670 { 7671 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7672 7673 /* XXX: check inner IP header */ 7674 7675 return 1; 7676 } 7677 7678 /* record data transfer on SA, and update timestamps */ 7679 void 7680 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m) 7681 { 7682 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7683 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7684 if (!sav->lft_c) 7685 return; 7686 7687 /* 7688 * XXX Currently, there is a difference of bytes size 7689 * between inbound and outbound processing. 7690 */ 7691 sav->lft_c->bytes += m->m_pkthdr.len; 7692 /* to check bytes lifetime is done in key_timehandler(). */ 7693 7694 /* 7695 * We use the number of packets as the unit of 7696 * allocations. We increment the variable 7697 * whenever {esp,ah}_{in,out}put is called. 7698 */ 7699 sav->lft_c->allocations++; 7700 /* XXX check for expires? */ 7701 7702 /* 7703 * NOTE: We record CURRENT usetime by using wall clock, 7704 * in seconds. HARD and SOFT lifetime are measured by the time 7705 * difference (again in seconds) from usetime. 7706 * 7707 * usetime 7708 * v expire expire 7709 * -----+-----+--------+---> t 7710 * <--------------> HARD 7711 * <-----> SOFT 7712 */ 7713 sav->lft_c->usetime = time_second; 7714 /* XXX check for expires? */ 7715 7716 return; 7717 } 7718 7719 static void 7720 key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7721 { 7722 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7723 SAHTREE_LOCK_ASSERT(); 7724 7725 if (sav->state != state) { 7726 if (__LIST_CHAINED(sav)) 7727 LIST_REMOVE(sav, chain); 7728 sav->state = state; 7729 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7730 } 7731 } 7732 7733 void 7734 key_sa_stir_iv(struct secasvar *sav) 7735 { 7736 7737 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7738 key_randomfill(sav->iv, sav->ivlen); 7739 } 7740 7741 /* 7742 * Take one of the kernel's security keys and convert it into a PF_KEY 7743 * structure within an mbuf, suitable for sending up to a waiting 7744 * application in user land. 7745 * 7746 * IN: 7747 * src: A pointer to a kernel security key. 7748 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7749 * OUT: 7750 * a valid mbuf or NULL indicating an error 7751 * 7752 */ 7753 7754 static struct mbuf * 7755 key_setkey(struct seckey *src, u_int16_t exttype) 7756 { 7757 struct mbuf *m; 7758 struct sadb_key *p; 7759 int len; 7760 7761 if (src == NULL) 7762 return NULL; 7763 7764 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7765 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 7766 if (m == NULL) 7767 return NULL; 7768 m_align(m, len); 7769 m->m_len = len; 7770 p = mtod(m, struct sadb_key *); 7771 bzero(p, len); 7772 p->sadb_key_len = PFKEY_UNIT64(len); 7773 p->sadb_key_exttype = exttype; 7774 p->sadb_key_bits = src->bits; 7775 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7776 7777 return m; 7778 } 7779 7780 /* 7781 * Take one of the kernel's lifetime data structures and convert it 7782 * into a PF_KEY structure within an mbuf, suitable for sending up to 7783 * a waiting application in user land. 7784 * 7785 * IN: 7786 * src: A pointer to a kernel lifetime structure. 7787 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7788 * data structures for more information. 7789 * OUT: 7790 * a valid mbuf or NULL indicating an error 7791 * 7792 */ 7793 7794 static struct mbuf * 7795 key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7796 { 7797 struct mbuf *m = NULL; 7798 struct sadb_lifetime *p; 7799 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7800 7801 if (src == NULL) 7802 return NULL; 7803 7804 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 7805 if (m == NULL) 7806 return m; 7807 m_align(m, len); 7808 m->m_len = len; 7809 p = mtod(m, struct sadb_lifetime *); 7810 7811 bzero(p, len); 7812 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7813 p->sadb_lifetime_exttype = exttype; 7814 p->sadb_lifetime_allocations = src->allocations; 7815 p->sadb_lifetime_bytes = src->bytes; 7816 p->sadb_lifetime_addtime = src->addtime; 7817 p->sadb_lifetime_usetime = src->usetime; 7818 7819 return m; 7820 7821 } 7822