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/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/sysctl.h> 54 #include <sys/errno.h> 55 #include <sys/proc.h> 56 #include <sys/queue.h> 57 #include <sys/refcount.h> 58 #include <sys/syslog.h> 59 60 #include <net/if.h> 61 #include <net/route.h> 62 #include <net/raw_cb.h> 63 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/ip.h> 67 #include <netinet/in_var.h> 68 69 #ifdef INET6 70 #include <netinet/ip6.h> 71 #include <netinet6/in6_var.h> 72 #include <netinet6/ip6_var.h> 73 #endif /* INET6 */ 74 75 #ifdef INET 76 #include <netinet/in_pcb.h> 77 #endif 78 #ifdef INET6 79 #include <netinet6/in6_pcb.h> 80 #endif /* INET6 */ 81 82 #include <net/pfkeyv2.h> 83 #include <netipsec/keydb.h> 84 #include <netipsec/key.h> 85 #include <netipsec/keysock.h> 86 #include <netipsec/key_debug.h> 87 88 #include <netipsec/ipsec.h> 89 #ifdef INET6 90 #include <netipsec/ipsec6.h> 91 #endif 92 93 #include <netipsec/xform.h> 94 95 #include <machine/stdarg.h> 96 97 /* randomness */ 98 #include <sys/random.h> 99 #include <sys/vimage.h> 100 101 #define FULLMASK 0xff 102 #define _BITS(bytes) ((bytes) << 3) 103 104 /* 105 * Note on SA reference counting: 106 * - SAs that are not in DEAD state will have (total external reference + 1) 107 * following value in reference count field. they cannot be freed and are 108 * referenced from SA header. 109 * - SAs that are in DEAD state will have (total external reference) 110 * in reference count field. they are ready to be freed. reference from 111 * SA header will be removed in key_delsav(), when the reference count 112 * field hits 0 (= no external reference other than from SA header. 113 */ 114 115 u_int32_t key_debug_level = 0; 116 static u_int key_spi_trycnt = 1000; 117 static u_int32_t key_spi_minval = 0x100; 118 static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */ 119 static u_int32_t policy_id = 0; 120 static u_int key_int_random = 60; /*interval to initialize randseed,1(m)*/ 121 static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 122 static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 123 static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 124 static int key_preferred_oldsa = 1; /* preferred old sa rather than new sa.*/ 125 126 static u_int32_t acq_seq = 0; 127 128 static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */ 129 static struct mtx sptree_lock; 130 #define SPTREE_LOCK_INIT() \ 131 mtx_init(&sptree_lock, "sptree", \ 132 "fast ipsec security policy database", MTX_DEF) 133 #define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 134 #define SPTREE_LOCK() mtx_lock(&sptree_lock) 135 #define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 136 #define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 137 138 static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ 139 static struct mtx sahtree_lock; 140 #define SAHTREE_LOCK_INIT() \ 141 mtx_init(&sahtree_lock, "sahtree", \ 142 "fast ipsec security association database", MTX_DEF) 143 #define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 144 #define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 145 #define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 146 #define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 147 148 /* registed list */ 149 static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; 150 static struct mtx regtree_lock; 151 #define REGTREE_LOCK_INIT() \ 152 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 153 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 154 #define REGTREE_LOCK() mtx_lock(®tree_lock) 155 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 156 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 157 158 static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ 159 static struct mtx acq_lock; 160 #define ACQ_LOCK_INIT() \ 161 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 162 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 163 #define ACQ_LOCK() mtx_lock(&acq_lock) 164 #define ACQ_UNLOCK() mtx_unlock(&acq_lock) 165 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 166 167 static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ 168 static struct mtx spacq_lock; 169 #define SPACQ_LOCK_INIT() \ 170 mtx_init(&spacq_lock, "spacqtree", \ 171 "fast ipsec security policy acquire list", MTX_DEF) 172 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 173 #define SPACQ_LOCK() mtx_lock(&spacq_lock) 174 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 175 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 176 177 /* search order for SAs */ 178 static const u_int saorder_state_valid_prefer_old[] = { 179 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 180 }; 181 static const u_int saorder_state_valid_prefer_new[] = { 182 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 183 }; 184 static u_int saorder_state_alive[] = { 185 /* except DEAD */ 186 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 187 }; 188 static u_int saorder_state_any[] = { 189 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 190 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 191 }; 192 193 static const int minsize[] = { 194 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 195 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 196 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 197 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 198 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 199 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 200 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 201 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 202 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 203 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 204 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 205 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 206 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 207 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 208 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 209 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 210 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 211 0, /* SADB_X_EXT_KMPRIVATE */ 212 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 213 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 214 }; 215 static const int maxsize[] = { 216 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 217 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 218 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 220 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 221 0, /* SADB_EXT_ADDRESS_SRC */ 222 0, /* SADB_EXT_ADDRESS_DST */ 223 0, /* SADB_EXT_ADDRESS_PROXY */ 224 0, /* SADB_EXT_KEY_AUTH */ 225 0, /* SADB_EXT_KEY_ENCRYPT */ 226 0, /* SADB_EXT_IDENTITY_SRC */ 227 0, /* SADB_EXT_IDENTITY_DST */ 228 0, /* SADB_EXT_SENSITIVITY */ 229 0, /* SADB_EXT_PROPOSAL */ 230 0, /* SADB_EXT_SUPPORTED_AUTH */ 231 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 232 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 233 0, /* SADB_X_EXT_KMPRIVATE */ 234 0, /* SADB_X_EXT_POLICY */ 235 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 236 }; 237 238 static int ipsec_esp_keymin = 256; 239 static int ipsec_esp_auth = 0; 240 static int ipsec_ah_keymin = 128; 241 242 #ifdef SYSCTL_DECL 243 SYSCTL_DECL(_net_key); 244 #endif 245 246 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \ 247 &key_debug_level, 0, ""); 248 249 /* max count of trial for the decision of spi value */ 250 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \ 251 &key_spi_trycnt, 0, ""); 252 253 /* minimum spi value to allocate automatically. */ 254 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \ 255 &key_spi_minval, 0, ""); 256 257 /* maximun spi value to allocate automatically. */ 258 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \ 259 &key_spi_maxval, 0, ""); 260 261 /* interval to initialize randseed */ 262 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, CTLFLAG_RW, \ 263 &key_int_random, 0, ""); 264 265 /* lifetime for larval SA */ 266 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \ 267 &key_larval_lifetime, 0, ""); 268 269 /* counter for blocking to send SADB_ACQUIRE to IKEd */ 270 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \ 271 &key_blockacq_count, 0, ""); 272 273 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 274 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \ 275 &key_blockacq_lifetime, 0, ""); 276 277 /* ESP auth */ 278 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \ 279 &ipsec_esp_auth, 0, ""); 280 281 /* minimum ESP key length */ 282 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \ 283 &ipsec_esp_keymin, 0, ""); 284 285 /* minimum AH key length */ 286 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \ 287 &ipsec_ah_keymin, 0, ""); 288 289 /* perfered old SA rather than new SA */ 290 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa, CTLFLAG_RW,\ 291 &key_preferred_oldsa, 0, ""); 292 293 #define __LIST_CHAINED(elm) \ 294 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 295 #define LIST_INSERT_TAIL(head, elm, type, field) \ 296 do {\ 297 struct type *curelm = LIST_FIRST(head); \ 298 if (curelm == NULL) {\ 299 LIST_INSERT_HEAD(head, elm, field); \ 300 } else { \ 301 while (LIST_NEXT(curelm, field)) \ 302 curelm = LIST_NEXT(curelm, field);\ 303 LIST_INSERT_AFTER(curelm, elm, field);\ 304 }\ 305 } while (0) 306 307 #define KEY_CHKSASTATE(head, sav, name) \ 308 do { \ 309 if ((head) != (sav)) { \ 310 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 311 (name), (head), (sav))); \ 312 continue; \ 313 } \ 314 } while (0) 315 316 #define KEY_CHKSPDIR(head, sp, name) \ 317 do { \ 318 if ((head) != (sp)) { \ 319 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 320 "anyway continue.\n", \ 321 (name), (head), (sp))); \ 322 } \ 323 } while (0) 324 325 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 326 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 327 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 328 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 329 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 330 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 331 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 332 333 /* 334 * set parameters into secpolicyindex buffer. 335 * Must allocate secpolicyindex buffer passed to this function. 336 */ 337 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 338 do { \ 339 bzero((idx), sizeof(struct secpolicyindex)); \ 340 (idx)->dir = (_dir); \ 341 (idx)->prefs = (ps); \ 342 (idx)->prefd = (pd); \ 343 (idx)->ul_proto = (ulp); \ 344 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 345 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 346 } while (0) 347 348 /* 349 * set parameters into secasindex buffer. 350 * Must allocate secasindex buffer before calling this function. 351 */ 352 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 353 do { \ 354 bzero((idx), sizeof(struct secasindex)); \ 355 (idx)->proto = (p); \ 356 (idx)->mode = (m); \ 357 (idx)->reqid = (r); \ 358 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 359 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 360 } while (0) 361 362 /* key statistics */ 363 struct _keystat { 364 u_long getspi_count; /* the avarage of count to try to get new SPI */ 365 } keystat; 366 367 struct sadb_msghdr { 368 struct sadb_msg *msg; 369 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 370 int extoff[SADB_EXT_MAX + 1]; 371 int extlen[SADB_EXT_MAX + 1]; 372 }; 373 374 static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 375 static void key_freesp_so __P((struct secpolicy **)); 376 static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 377 static void key_delsp __P((struct secpolicy *)); 378 static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 379 static void _key_delsp(struct secpolicy *sp); 380 static struct secpolicy *key_getspbyid __P((u_int32_t)); 381 static u_int32_t key_newreqid __P((void)); 382 static struct mbuf *key_gather_mbuf __P((struct mbuf *, 383 const struct sadb_msghdr *, int, int, ...)); 384 static int key_spdadd __P((struct socket *, struct mbuf *, 385 const struct sadb_msghdr *)); 386 static u_int32_t key_getnewspid __P((void)); 387 static int key_spddelete __P((struct socket *, struct mbuf *, 388 const struct sadb_msghdr *)); 389 static int key_spddelete2 __P((struct socket *, struct mbuf *, 390 const struct sadb_msghdr *)); 391 static int key_spdget __P((struct socket *, struct mbuf *, 392 const struct sadb_msghdr *)); 393 static int key_spdflush __P((struct socket *, struct mbuf *, 394 const struct sadb_msghdr *)); 395 static int key_spddump __P((struct socket *, struct mbuf *, 396 const struct sadb_msghdr *)); 397 static struct mbuf *key_setdumpsp __P((struct secpolicy *, 398 u_int8_t, u_int32_t, u_int32_t)); 399 static u_int key_getspreqmsglen __P((struct secpolicy *)); 400 static int key_spdexpire __P((struct secpolicy *)); 401 static struct secashead *key_newsah __P((struct secasindex *)); 402 static void key_delsah __P((struct secashead *)); 403 static struct secasvar *key_newsav __P((struct mbuf *, 404 const struct sadb_msghdr *, struct secashead *, int *, 405 const char*, int)); 406 #define KEY_NEWSAV(m, sadb, sah, e) \ 407 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 408 static void key_delsav __P((struct secasvar *)); 409 static struct secashead *key_getsah __P((struct secasindex *)); 410 static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 411 static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 412 static int key_setsaval __P((struct secasvar *, struct mbuf *, 413 const struct sadb_msghdr *)); 414 static int key_mature __P((struct secasvar *)); 415 static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 416 u_int8_t, u_int32_t, u_int32_t)); 417 static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 418 u_int32_t, pid_t, u_int16_t)); 419 static struct mbuf *key_setsadbsa __P((struct secasvar *)); 420 static struct mbuf *key_setsadbaddr __P((u_int16_t, 421 const struct sockaddr *, u_int8_t, u_int16_t)); 422 static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 423 static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 424 u_int32_t)); 425 static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 426 struct malloc_type *); 427 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 428 struct malloc_type *type); 429 #ifdef INET6 430 static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 431 #endif 432 433 /* flags for key_cmpsaidx() */ 434 #define CMP_HEAD 1 /* protocol, addresses. */ 435 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 436 #define CMP_REQID 3 /* additionally HEAD, reaid. */ 437 #define CMP_EXACTLY 4 /* all elements. */ 438 static int key_cmpsaidx 439 __P((const struct secasindex *, const struct secasindex *, int)); 440 441 static int key_cmpspidx_exactly 442 __P((struct secpolicyindex *, struct secpolicyindex *)); 443 static int key_cmpspidx_withmask 444 __P((struct secpolicyindex *, struct secpolicyindex *)); 445 static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 446 static int key_bbcmp __P((const void *, const void *, u_int)); 447 static u_int16_t key_satype2proto __P((u_int8_t)); 448 static u_int8_t key_proto2satype __P((u_int16_t)); 449 450 static int key_getspi __P((struct socket *, struct mbuf *, 451 const struct sadb_msghdr *)); 452 static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 453 struct secasindex *)); 454 static int key_update __P((struct socket *, struct mbuf *, 455 const struct sadb_msghdr *)); 456 #ifdef IPSEC_DOSEQCHECK 457 static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 458 #endif 459 static int key_add __P((struct socket *, struct mbuf *, 460 const struct sadb_msghdr *)); 461 static int key_setident __P((struct secashead *, struct mbuf *, 462 const struct sadb_msghdr *)); 463 static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 464 const struct sadb_msghdr *)); 465 static int key_delete __P((struct socket *, struct mbuf *, 466 const struct sadb_msghdr *)); 467 static int key_get __P((struct socket *, struct mbuf *, 468 const struct sadb_msghdr *)); 469 470 static void key_getcomb_setlifetime __P((struct sadb_comb *)); 471 static struct mbuf *key_getcomb_esp __P((void)); 472 static struct mbuf *key_getcomb_ah __P((void)); 473 static struct mbuf *key_getcomb_ipcomp __P((void)); 474 static struct mbuf *key_getprop __P((const struct secasindex *)); 475 476 static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 477 static struct secacq *key_newacq __P((const struct secasindex *)); 478 static struct secacq *key_getacq __P((const struct secasindex *)); 479 static struct secacq *key_getacqbyseq __P((u_int32_t)); 480 static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 481 static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 482 static int key_acquire2 __P((struct socket *, struct mbuf *, 483 const struct sadb_msghdr *)); 484 static int key_register __P((struct socket *, struct mbuf *, 485 const struct sadb_msghdr *)); 486 static int key_expire __P((struct secasvar *)); 487 static int key_flush __P((struct socket *, struct mbuf *, 488 const struct sadb_msghdr *)); 489 static int key_dump __P((struct socket *, struct mbuf *, 490 const struct sadb_msghdr *)); 491 static int key_promisc __P((struct socket *, struct mbuf *, 492 const struct sadb_msghdr *)); 493 static int key_senderror __P((struct socket *, struct mbuf *, int)); 494 static int key_validate_ext __P((const struct sadb_ext *, int)); 495 static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 496 static struct mbuf *key_setlifetime(struct seclifetime *src, 497 u_int16_t exttype); 498 static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 499 500 #if 0 501 static const char *key_getfqdn __P((void)); 502 static const char *key_getuserfqdn __P((void)); 503 #endif 504 static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 505 static struct mbuf *key_alloc_mbuf __P((int)); 506 507 static __inline void 508 sa_initref(struct secasvar *sav) 509 { 510 511 refcount_init(&sav->refcnt, 1); 512 } 513 static __inline void 514 sa_addref(struct secasvar *sav) 515 { 516 517 refcount_acquire(&sav->refcnt); 518 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 519 } 520 static __inline int 521 sa_delref(struct secasvar *sav) 522 { 523 524 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 525 return (refcount_release(&sav->refcnt)); 526 } 527 528 #define SP_ADDREF(p) do { \ 529 (p)->refcnt++; \ 530 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 531 } while (0) 532 #define SP_DELREF(p) do { \ 533 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 534 (p)->refcnt--; \ 535 } while (0) 536 537 538 /* 539 * Update the refcnt while holding the SPTREE lock. 540 */ 541 void 542 key_addref(struct secpolicy *sp) 543 { 544 SPTREE_LOCK(); 545 SP_ADDREF(sp); 546 SPTREE_UNLOCK(); 547 } 548 549 /* 550 * Return 0 when there are known to be no SP's for the specified 551 * direction. Otherwise return 1. This is used by IPsec code 552 * to optimize performance. 553 */ 554 int 555 key_havesp(u_int dir) 556 { 557 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 558 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 559 } 560 561 /* %%% IPsec policy management */ 562 /* 563 * allocating a SP for OUTBOUND or INBOUND packet. 564 * Must call key_freesp() later. 565 * OUT: NULL: not found 566 * others: found and return the pointer. 567 */ 568 struct secpolicy * 569 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 570 { 571 struct secpolicy *sp; 572 573 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 574 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 575 ("invalid direction %u", dir)); 576 577 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 578 printf("DP %s from %s:%u\n", __func__, where, tag)); 579 580 /* get a SP entry */ 581 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 582 printf("*** objects\n"); 583 kdebug_secpolicyindex(spidx)); 584 585 SPTREE_LOCK(); 586 LIST_FOREACH(sp, &V_sptree[dir], chain) { 587 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 588 printf("*** in SPD\n"); 589 kdebug_secpolicyindex(&sp->spidx)); 590 591 if (sp->state == IPSEC_SPSTATE_DEAD) 592 continue; 593 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 594 goto found; 595 } 596 sp = NULL; 597 found: 598 if (sp) { 599 /* sanity check */ 600 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 601 602 /* found a SPD entry */ 603 sp->lastused = time_second; 604 SP_ADDREF(sp); 605 } 606 SPTREE_UNLOCK(); 607 608 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 609 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 610 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 611 return sp; 612 } 613 614 /* 615 * allocating a SP for OUTBOUND or INBOUND packet. 616 * Must call key_freesp() later. 617 * OUT: NULL: not found 618 * others: found and return the pointer. 619 */ 620 struct secpolicy * 621 key_allocsp2(u_int32_t spi, 622 union sockaddr_union *dst, 623 u_int8_t proto, 624 u_int dir, 625 const char* where, int tag) 626 { 627 struct secpolicy *sp; 628 629 IPSEC_ASSERT(dst != NULL, ("null dst")); 630 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 631 ("invalid direction %u", dir)); 632 633 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 634 printf("DP %s from %s:%u\n", __func__, where, tag)); 635 636 /* get a SP entry */ 637 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 638 printf("*** objects\n"); 639 printf("spi %u proto %u dir %u\n", spi, proto, dir); 640 kdebug_sockaddr(&dst->sa)); 641 642 SPTREE_LOCK(); 643 LIST_FOREACH(sp, &V_sptree[dir], chain) { 644 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 645 printf("*** in SPD\n"); 646 kdebug_secpolicyindex(&sp->spidx)); 647 648 if (sp->state == IPSEC_SPSTATE_DEAD) 649 continue; 650 /* compare simple values, then dst address */ 651 if (sp->spidx.ul_proto != proto) 652 continue; 653 /* NB: spi's must exist and match */ 654 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 655 continue; 656 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 657 goto found; 658 } 659 sp = NULL; 660 found: 661 if (sp) { 662 /* sanity check */ 663 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 664 665 /* found a SPD entry */ 666 sp->lastused = time_second; 667 SP_ADDREF(sp); 668 } 669 SPTREE_UNLOCK(); 670 671 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 672 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 673 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 674 return sp; 675 } 676 677 /* 678 * return a policy that matches this particular inbound packet. 679 * XXX slow 680 */ 681 struct secpolicy * 682 key_gettunnel(const struct sockaddr *osrc, 683 const struct sockaddr *odst, 684 const struct sockaddr *isrc, 685 const struct sockaddr *idst, 686 const char* where, int tag) 687 { 688 struct secpolicy *sp; 689 const int dir = IPSEC_DIR_INBOUND; 690 struct ipsecrequest *r1, *r2, *p; 691 struct secpolicyindex spidx; 692 693 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 694 printf("DP %s from %s:%u\n", __func__, where, tag)); 695 696 if (isrc->sa_family != idst->sa_family) { 697 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 698 __func__, isrc->sa_family, idst->sa_family)); 699 sp = NULL; 700 goto done; 701 } 702 703 SPTREE_LOCK(); 704 LIST_FOREACH(sp, &V_sptree[dir], chain) { 705 if (sp->state == IPSEC_SPSTATE_DEAD) 706 continue; 707 708 r1 = r2 = NULL; 709 for (p = sp->req; p; p = p->next) { 710 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 711 continue; 712 713 r1 = r2; 714 r2 = p; 715 716 if (!r1) { 717 /* here we look at address matches only */ 718 spidx = sp->spidx; 719 if (isrc->sa_len > sizeof(spidx.src) || 720 idst->sa_len > sizeof(spidx.dst)) 721 continue; 722 bcopy(isrc, &spidx.src, isrc->sa_len); 723 bcopy(idst, &spidx.dst, idst->sa_len); 724 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 725 continue; 726 } else { 727 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 728 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 729 continue; 730 } 731 732 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 733 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 734 continue; 735 736 goto found; 737 } 738 } 739 sp = NULL; 740 found: 741 if (sp) { 742 sp->lastused = time_second; 743 SP_ADDREF(sp); 744 } 745 SPTREE_UNLOCK(); 746 done: 747 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 748 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 749 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 750 return sp; 751 } 752 753 /* 754 * allocating an SA entry for an *OUTBOUND* packet. 755 * checking each request entries in SP, and acquire an SA if need. 756 * OUT: 0: there are valid requests. 757 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 758 */ 759 int 760 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 761 { 762 u_int level; 763 int error; 764 765 IPSEC_ASSERT(isr != NULL, ("null isr")); 766 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 767 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 768 saidx->mode == IPSEC_MODE_TUNNEL, 769 ("unexpected policy %u", saidx->mode)); 770 771 /* 772 * XXX guard against protocol callbacks from the crypto 773 * thread as they reference ipsecrequest.sav which we 774 * temporarily null out below. Need to rethink how we 775 * handle bundled SA's in the callback thread. 776 */ 777 IPSECREQUEST_LOCK_ASSERT(isr); 778 779 /* get current level */ 780 level = ipsec_get_reqlevel(isr); 781 #if 0 782 /* 783 * We do allocate new SA only if the state of SA in the holder is 784 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 785 */ 786 if (isr->sav != NULL) { 787 if (isr->sav->sah == NULL) 788 panic("%s: sah is null.\n", __func__); 789 if (isr->sav == (struct secasvar *)LIST_FIRST( 790 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 791 KEY_FREESAV(&isr->sav); 792 isr->sav = NULL; 793 } 794 } 795 #else 796 /* 797 * we free any SA stashed in the IPsec request because a different 798 * SA may be involved each time this request is checked, either 799 * because new SAs are being configured, or this request is 800 * associated with an unconnected datagram socket, or this request 801 * is associated with a system default policy. 802 * 803 * The operation may have negative impact to performance. We may 804 * want to check cached SA carefully, rather than picking new SA 805 * every time. 806 */ 807 if (isr->sav != NULL) { 808 KEY_FREESAV(&isr->sav); 809 isr->sav = NULL; 810 } 811 #endif 812 813 /* 814 * new SA allocation if no SA found. 815 * key_allocsa_policy should allocate the oldest SA available. 816 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 817 */ 818 if (isr->sav == NULL) 819 isr->sav = key_allocsa_policy(saidx); 820 821 /* When there is SA. */ 822 if (isr->sav != NULL) { 823 if (isr->sav->state != SADB_SASTATE_MATURE && 824 isr->sav->state != SADB_SASTATE_DYING) 825 return EINVAL; 826 return 0; 827 } 828 829 /* there is no SA */ 830 error = key_acquire(saidx, isr->sp); 831 if (error != 0) { 832 /* XXX What should I do ? */ 833 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 834 __func__, error)); 835 return error; 836 } 837 838 if (level != IPSEC_LEVEL_REQUIRE) { 839 /* XXX sigh, the interface to this routine is botched */ 840 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 841 return 0; 842 } else { 843 return ENOENT; 844 } 845 } 846 847 /* 848 * allocating a SA for policy entry from SAD. 849 * NOTE: searching SAD of aliving state. 850 * OUT: NULL: not found. 851 * others: found and return the pointer. 852 */ 853 static struct secasvar * 854 key_allocsa_policy(const struct secasindex *saidx) 855 { 856 #define N(a) _ARRAYLEN(a) 857 struct secashead *sah; 858 struct secasvar *sav; 859 u_int stateidx, arraysize; 860 const u_int *state_valid; 861 862 SAHTREE_LOCK(); 863 LIST_FOREACH(sah, &V_sahtree, chain) { 864 if (sah->state == SADB_SASTATE_DEAD) 865 continue; 866 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 867 if (V_key_preferred_oldsa) { 868 state_valid = saorder_state_valid_prefer_old; 869 arraysize = N(saorder_state_valid_prefer_old); 870 } else { 871 state_valid = saorder_state_valid_prefer_new; 872 arraysize = N(saorder_state_valid_prefer_new); 873 } 874 SAHTREE_UNLOCK(); 875 goto found; 876 } 877 } 878 SAHTREE_UNLOCK(); 879 880 return NULL; 881 882 found: 883 /* search valid state */ 884 for (stateidx = 0; stateidx < arraysize; stateidx++) { 885 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 886 if (sav != NULL) 887 return sav; 888 } 889 890 return NULL; 891 #undef N 892 } 893 894 /* 895 * searching SAD with direction, protocol, mode and state. 896 * called by key_allocsa_policy(). 897 * OUT: 898 * NULL : not found 899 * others : found, pointer to a SA. 900 */ 901 static struct secasvar * 902 key_do_allocsa_policy(struct secashead *sah, u_int state) 903 { 904 struct secasvar *sav, *nextsav, *candidate, *d; 905 906 /* initilize */ 907 candidate = NULL; 908 909 SAHTREE_LOCK(); 910 for (sav = LIST_FIRST(&sah->savtree[state]); 911 sav != NULL; 912 sav = nextsav) { 913 914 nextsav = LIST_NEXT(sav, chain); 915 916 /* sanity check */ 917 KEY_CHKSASTATE(sav->state, state, __func__); 918 919 /* initialize */ 920 if (candidate == NULL) { 921 candidate = sav; 922 continue; 923 } 924 925 /* Which SA is the better ? */ 926 927 IPSEC_ASSERT(candidate->lft_c != NULL, 928 ("null candidate lifetime")); 929 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 930 931 /* What the best method is to compare ? */ 932 if (V_key_preferred_oldsa) { 933 if (candidate->lft_c->addtime > 934 sav->lft_c->addtime) { 935 candidate = sav; 936 } 937 continue; 938 /*NOTREACHED*/ 939 } 940 941 /* preferred new sa rather than old sa */ 942 if (candidate->lft_c->addtime < 943 sav->lft_c->addtime) { 944 d = candidate; 945 candidate = sav; 946 } else 947 d = sav; 948 949 /* 950 * prepared to delete the SA when there is more 951 * suitable candidate and the lifetime of the SA is not 952 * permanent. 953 */ 954 if (d->lft_h->addtime != 0) { 955 struct mbuf *m, *result; 956 u_int8_t satype; 957 958 key_sa_chgstate(d, SADB_SASTATE_DEAD); 959 960 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 961 962 satype = key_proto2satype(d->sah->saidx.proto); 963 if (satype == 0) 964 goto msgfail; 965 966 m = key_setsadbmsg(SADB_DELETE, 0, 967 satype, 0, 0, d->refcnt - 1); 968 if (!m) 969 goto msgfail; 970 result = m; 971 972 /* set sadb_address for saidx's. */ 973 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 974 &d->sah->saidx.src.sa, 975 d->sah->saidx.src.sa.sa_len << 3, 976 IPSEC_ULPROTO_ANY); 977 if (!m) 978 goto msgfail; 979 m_cat(result, m); 980 981 /* set sadb_address for saidx's. */ 982 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 983 &d->sah->saidx.dst.sa, 984 d->sah->saidx.dst.sa.sa_len << 3, 985 IPSEC_ULPROTO_ANY); 986 if (!m) 987 goto msgfail; 988 m_cat(result, m); 989 990 /* create SA extension */ 991 m = key_setsadbsa(d); 992 if (!m) 993 goto msgfail; 994 m_cat(result, m); 995 996 if (result->m_len < sizeof(struct sadb_msg)) { 997 result = m_pullup(result, 998 sizeof(struct sadb_msg)); 999 if (result == NULL) 1000 goto msgfail; 1001 } 1002 1003 result->m_pkthdr.len = 0; 1004 for (m = result; m; m = m->m_next) 1005 result->m_pkthdr.len += m->m_len; 1006 mtod(result, struct sadb_msg *)->sadb_msg_len = 1007 PFKEY_UNIT64(result->m_pkthdr.len); 1008 1009 if (key_sendup_mbuf(NULL, result, 1010 KEY_SENDUP_REGISTERED)) 1011 goto msgfail; 1012 msgfail: 1013 KEY_FREESAV(&d); 1014 } 1015 } 1016 if (candidate) { 1017 sa_addref(candidate); 1018 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1019 printf("DP %s cause refcnt++:%d SA:%p\n", 1020 __func__, candidate->refcnt, candidate)); 1021 } 1022 SAHTREE_UNLOCK(); 1023 1024 return candidate; 1025 } 1026 1027 /* 1028 * allocating a usable SA entry for a *INBOUND* packet. 1029 * Must call key_freesav() later. 1030 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1031 * NULL: not found, or error occured. 1032 * 1033 * In the comparison, no source address is used--for RFC2401 conformance. 1034 * To quote, from section 4.1: 1035 * A security association is uniquely identified by a triple consisting 1036 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1037 * security protocol (AH or ESP) identifier. 1038 * Note that, however, we do need to keep source address in IPsec SA. 1039 * IKE specification and PF_KEY specification do assume that we 1040 * keep source address in IPsec SA. We see a tricky situation here. 1041 */ 1042 struct secasvar * 1043 key_allocsa( 1044 union sockaddr_union *dst, 1045 u_int proto, 1046 u_int32_t spi, 1047 const char* where, int tag) 1048 { 1049 struct secashead *sah; 1050 struct secasvar *sav; 1051 u_int stateidx, arraysize, state; 1052 const u_int *saorder_state_valid; 1053 1054 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1055 1056 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1057 printf("DP %s from %s:%u\n", __func__, where, tag)); 1058 1059 /* 1060 * searching SAD. 1061 * XXX: to be checked internal IP header somewhere. Also when 1062 * IPsec tunnel packet is received. But ESP tunnel mode is 1063 * encrypted so we can't check internal IP header. 1064 */ 1065 SAHTREE_LOCK(); 1066 if (V_key_preferred_oldsa) { 1067 saorder_state_valid = saorder_state_valid_prefer_old; 1068 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1069 } else { 1070 saorder_state_valid = saorder_state_valid_prefer_new; 1071 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1072 } 1073 LIST_FOREACH(sah, &V_sahtree, chain) { 1074 /* search valid state */ 1075 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1076 state = saorder_state_valid[stateidx]; 1077 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1078 /* sanity check */ 1079 KEY_CHKSASTATE(sav->state, state, __func__); 1080 /* do not return entries w/ unusable state */ 1081 if (sav->state != SADB_SASTATE_MATURE && 1082 sav->state != SADB_SASTATE_DYING) 1083 continue; 1084 if (proto != sav->sah->saidx.proto) 1085 continue; 1086 if (spi != sav->spi) 1087 continue; 1088 #if 0 /* don't check src */ 1089 /* check src address */ 1090 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) 1091 continue; 1092 #endif 1093 /* check dst address */ 1094 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0) 1095 continue; 1096 sa_addref(sav); 1097 goto done; 1098 } 1099 } 1100 } 1101 sav = NULL; 1102 done: 1103 SAHTREE_UNLOCK(); 1104 1105 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1106 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1107 sav, sav ? sav->refcnt : 0)); 1108 return sav; 1109 } 1110 1111 /* 1112 * Must be called after calling key_allocsp(). 1113 * For both the packet without socket and key_freeso(). 1114 */ 1115 void 1116 _key_freesp(struct secpolicy **spp, const char* where, int tag) 1117 { 1118 struct secpolicy *sp = *spp; 1119 1120 IPSEC_ASSERT(sp != NULL, ("null sp")); 1121 1122 SPTREE_LOCK(); 1123 SP_DELREF(sp); 1124 1125 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1126 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1127 __func__, sp, sp->id, where, tag, sp->refcnt)); 1128 1129 if (sp->refcnt == 0) { 1130 *spp = NULL; 1131 key_delsp(sp); 1132 } 1133 SPTREE_UNLOCK(); 1134 } 1135 1136 /* 1137 * Must be called after calling key_allocsp(). 1138 * For the packet with socket. 1139 */ 1140 void 1141 key_freeso(struct socket *so) 1142 { 1143 IPSEC_ASSERT(so != NULL, ("null so")); 1144 1145 switch (so->so_proto->pr_domain->dom_family) { 1146 #ifdef INET 1147 case PF_INET: 1148 { 1149 struct inpcb *pcb = sotoinpcb(so); 1150 1151 /* Does it have a PCB ? */ 1152 if (pcb == NULL) 1153 return; 1154 key_freesp_so(&pcb->inp_sp->sp_in); 1155 key_freesp_so(&pcb->inp_sp->sp_out); 1156 } 1157 break; 1158 #endif 1159 #ifdef INET6 1160 case PF_INET6: 1161 { 1162 #ifdef HAVE_NRL_INPCB 1163 struct inpcb *pcb = sotoinpcb(so); 1164 1165 /* Does it have a PCB ? */ 1166 if (pcb == NULL) 1167 return; 1168 key_freesp_so(&pcb->inp_sp->sp_in); 1169 key_freesp_so(&pcb->inp_sp->sp_out); 1170 #else 1171 struct in6pcb *pcb = sotoin6pcb(so); 1172 1173 /* Does it have a PCB ? */ 1174 if (pcb == NULL) 1175 return; 1176 key_freesp_so(&pcb->in6p_sp->sp_in); 1177 key_freesp_so(&pcb->in6p_sp->sp_out); 1178 #endif 1179 } 1180 break; 1181 #endif /* INET6 */ 1182 default: 1183 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1184 __func__, so->so_proto->pr_domain->dom_family)); 1185 return; 1186 } 1187 } 1188 1189 static void 1190 key_freesp_so(struct secpolicy **sp) 1191 { 1192 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1193 1194 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1195 (*sp)->policy == IPSEC_POLICY_BYPASS) 1196 return; 1197 1198 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1199 ("invalid policy %u", (*sp)->policy)); 1200 KEY_FREESP(sp); 1201 } 1202 1203 /* 1204 * Must be called after calling key_allocsa(). 1205 * This function is called by key_freesp() to free some SA allocated 1206 * for a policy. 1207 */ 1208 void 1209 key_freesav(struct secasvar **psav, const char* where, int tag) 1210 { 1211 struct secasvar *sav = *psav; 1212 1213 IPSEC_ASSERT(sav != NULL, ("null sav")); 1214 1215 if (sa_delref(sav)) { 1216 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1217 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1218 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1219 *psav = NULL; 1220 key_delsav(sav); 1221 } else { 1222 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1223 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1224 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1225 } 1226 } 1227 1228 /* %%% SPD management */ 1229 /* 1230 * free security policy entry. 1231 */ 1232 static void 1233 key_delsp(struct secpolicy *sp) 1234 { 1235 struct ipsecrequest *isr, *nextisr; 1236 1237 IPSEC_ASSERT(sp != NULL, ("null sp")); 1238 SPTREE_LOCK_ASSERT(); 1239 1240 sp->state = IPSEC_SPSTATE_DEAD; 1241 1242 IPSEC_ASSERT(sp->refcnt == 0, 1243 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1244 1245 /* remove from SP index */ 1246 if (__LIST_CHAINED(sp)) 1247 LIST_REMOVE(sp, chain); 1248 1249 for (isr = sp->req; isr != NULL; isr = nextisr) { 1250 if (isr->sav != NULL) { 1251 KEY_FREESAV(&isr->sav); 1252 isr->sav = NULL; 1253 } 1254 1255 nextisr = isr->next; 1256 ipsec_delisr(isr); 1257 } 1258 _key_delsp(sp); 1259 } 1260 1261 /* 1262 * search SPD 1263 * OUT: NULL : not found 1264 * others : found, pointer to a SP. 1265 */ 1266 static struct secpolicy * 1267 key_getsp(struct secpolicyindex *spidx) 1268 { 1269 struct secpolicy *sp; 1270 1271 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1272 1273 SPTREE_LOCK(); 1274 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1275 if (sp->state == IPSEC_SPSTATE_DEAD) 1276 continue; 1277 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1278 SP_ADDREF(sp); 1279 break; 1280 } 1281 } 1282 SPTREE_UNLOCK(); 1283 1284 return sp; 1285 } 1286 1287 /* 1288 * get SP by index. 1289 * OUT: NULL : not found 1290 * others : found, pointer to a SP. 1291 */ 1292 static struct secpolicy * 1293 key_getspbyid(u_int32_t id) 1294 { 1295 struct secpolicy *sp; 1296 1297 SPTREE_LOCK(); 1298 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1299 if (sp->state == IPSEC_SPSTATE_DEAD) 1300 continue; 1301 if (sp->id == id) { 1302 SP_ADDREF(sp); 1303 goto done; 1304 } 1305 } 1306 1307 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1308 if (sp->state == IPSEC_SPSTATE_DEAD) 1309 continue; 1310 if (sp->id == id) { 1311 SP_ADDREF(sp); 1312 goto done; 1313 } 1314 } 1315 done: 1316 SPTREE_UNLOCK(); 1317 1318 return sp; 1319 } 1320 1321 struct secpolicy * 1322 key_newsp(const char* where, int tag) 1323 { 1324 struct secpolicy *newsp = NULL; 1325 1326 newsp = (struct secpolicy *) 1327 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1328 if (newsp) { 1329 SECPOLICY_LOCK_INIT(newsp); 1330 newsp->refcnt = 1; 1331 newsp->req = NULL; 1332 } 1333 1334 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1335 printf("DP %s from %s:%u return SP:%p\n", __func__, 1336 where, tag, newsp)); 1337 return newsp; 1338 } 1339 1340 static void 1341 _key_delsp(struct secpolicy *sp) 1342 { 1343 SECPOLICY_LOCK_DESTROY(sp); 1344 free(sp, M_IPSEC_SP); 1345 } 1346 1347 /* 1348 * create secpolicy structure from sadb_x_policy structure. 1349 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1350 * so must be set properly later. 1351 */ 1352 struct secpolicy * 1353 key_msg2sp(xpl0, len, error) 1354 struct sadb_x_policy *xpl0; 1355 size_t len; 1356 int *error; 1357 { 1358 struct secpolicy *newsp; 1359 1360 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1361 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1362 1363 if (len != PFKEY_EXTLEN(xpl0)) { 1364 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1365 *error = EINVAL; 1366 return NULL; 1367 } 1368 1369 if ((newsp = KEY_NEWSP()) == NULL) { 1370 *error = ENOBUFS; 1371 return NULL; 1372 } 1373 1374 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1375 newsp->policy = xpl0->sadb_x_policy_type; 1376 1377 /* check policy */ 1378 switch (xpl0->sadb_x_policy_type) { 1379 case IPSEC_POLICY_DISCARD: 1380 case IPSEC_POLICY_NONE: 1381 case IPSEC_POLICY_ENTRUST: 1382 case IPSEC_POLICY_BYPASS: 1383 newsp->req = NULL; 1384 break; 1385 1386 case IPSEC_POLICY_IPSEC: 1387 { 1388 int tlen; 1389 struct sadb_x_ipsecrequest *xisr; 1390 struct ipsecrequest **p_isr = &newsp->req; 1391 1392 /* validity check */ 1393 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1394 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1395 __func__)); 1396 KEY_FREESP(&newsp); 1397 *error = EINVAL; 1398 return NULL; 1399 } 1400 1401 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1402 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1403 1404 while (tlen > 0) { 1405 /* length check */ 1406 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1407 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1408 "length.\n", __func__)); 1409 KEY_FREESP(&newsp); 1410 *error = EINVAL; 1411 return NULL; 1412 } 1413 1414 /* allocate request buffer */ 1415 /* NB: data structure is zero'd */ 1416 *p_isr = ipsec_newisr(); 1417 if ((*p_isr) == NULL) { 1418 ipseclog((LOG_DEBUG, 1419 "%s: No more memory.\n", __func__)); 1420 KEY_FREESP(&newsp); 1421 *error = ENOBUFS; 1422 return NULL; 1423 } 1424 1425 /* set values */ 1426 switch (xisr->sadb_x_ipsecrequest_proto) { 1427 case IPPROTO_ESP: 1428 case IPPROTO_AH: 1429 case IPPROTO_IPCOMP: 1430 break; 1431 default: 1432 ipseclog((LOG_DEBUG, 1433 "%s: invalid proto type=%u\n", __func__, 1434 xisr->sadb_x_ipsecrequest_proto)); 1435 KEY_FREESP(&newsp); 1436 *error = EPROTONOSUPPORT; 1437 return NULL; 1438 } 1439 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1440 1441 switch (xisr->sadb_x_ipsecrequest_mode) { 1442 case IPSEC_MODE_TRANSPORT: 1443 case IPSEC_MODE_TUNNEL: 1444 break; 1445 case IPSEC_MODE_ANY: 1446 default: 1447 ipseclog((LOG_DEBUG, 1448 "%s: invalid mode=%u\n", __func__, 1449 xisr->sadb_x_ipsecrequest_mode)); 1450 KEY_FREESP(&newsp); 1451 *error = EINVAL; 1452 return NULL; 1453 } 1454 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1455 1456 switch (xisr->sadb_x_ipsecrequest_level) { 1457 case IPSEC_LEVEL_DEFAULT: 1458 case IPSEC_LEVEL_USE: 1459 case IPSEC_LEVEL_REQUIRE: 1460 break; 1461 case IPSEC_LEVEL_UNIQUE: 1462 /* validity check */ 1463 /* 1464 * If range violation of reqid, kernel will 1465 * update it, don't refuse it. 1466 */ 1467 if (xisr->sadb_x_ipsecrequest_reqid 1468 > IPSEC_MANUAL_REQID_MAX) { 1469 ipseclog((LOG_DEBUG, 1470 "%s: reqid=%d range " 1471 "violation, updated by kernel.\n", 1472 __func__, 1473 xisr->sadb_x_ipsecrequest_reqid)); 1474 xisr->sadb_x_ipsecrequest_reqid = 0; 1475 } 1476 1477 /* allocate new reqid id if reqid is zero. */ 1478 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1479 u_int32_t reqid; 1480 if ((reqid = key_newreqid()) == 0) { 1481 KEY_FREESP(&newsp); 1482 *error = ENOBUFS; 1483 return NULL; 1484 } 1485 (*p_isr)->saidx.reqid = reqid; 1486 xisr->sadb_x_ipsecrequest_reqid = reqid; 1487 } else { 1488 /* set it for manual keying. */ 1489 (*p_isr)->saidx.reqid = 1490 xisr->sadb_x_ipsecrequest_reqid; 1491 } 1492 break; 1493 1494 default: 1495 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1496 __func__, 1497 xisr->sadb_x_ipsecrequest_level)); 1498 KEY_FREESP(&newsp); 1499 *error = EINVAL; 1500 return NULL; 1501 } 1502 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1503 1504 /* set IP addresses if there */ 1505 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1506 struct sockaddr *paddr; 1507 1508 paddr = (struct sockaddr *)(xisr + 1); 1509 1510 /* validity check */ 1511 if (paddr->sa_len 1512 > sizeof((*p_isr)->saidx.src)) { 1513 ipseclog((LOG_DEBUG, "%s: invalid " 1514 "request address length.\n", 1515 __func__)); 1516 KEY_FREESP(&newsp); 1517 *error = EINVAL; 1518 return NULL; 1519 } 1520 bcopy(paddr, &(*p_isr)->saidx.src, 1521 paddr->sa_len); 1522 1523 paddr = (struct sockaddr *)((caddr_t)paddr 1524 + paddr->sa_len); 1525 1526 /* validity check */ 1527 if (paddr->sa_len 1528 > sizeof((*p_isr)->saidx.dst)) { 1529 ipseclog((LOG_DEBUG, "%s: invalid " 1530 "request address length.\n", 1531 __func__)); 1532 KEY_FREESP(&newsp); 1533 *error = EINVAL; 1534 return NULL; 1535 } 1536 bcopy(paddr, &(*p_isr)->saidx.dst, 1537 paddr->sa_len); 1538 } 1539 1540 (*p_isr)->sp = newsp; 1541 1542 /* initialization for the next. */ 1543 p_isr = &(*p_isr)->next; 1544 tlen -= xisr->sadb_x_ipsecrequest_len; 1545 1546 /* validity check */ 1547 if (tlen < 0) { 1548 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1549 __func__)); 1550 KEY_FREESP(&newsp); 1551 *error = EINVAL; 1552 return NULL; 1553 } 1554 1555 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1556 + xisr->sadb_x_ipsecrequest_len); 1557 } 1558 } 1559 break; 1560 default: 1561 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1562 KEY_FREESP(&newsp); 1563 *error = EINVAL; 1564 return NULL; 1565 } 1566 1567 *error = 0; 1568 return newsp; 1569 } 1570 1571 static u_int32_t 1572 key_newreqid() 1573 { 1574 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1575 1576 auto_reqid = (auto_reqid == ~0 1577 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1578 1579 /* XXX should be unique check */ 1580 1581 return auto_reqid; 1582 } 1583 1584 /* 1585 * copy secpolicy struct to sadb_x_policy structure indicated. 1586 */ 1587 struct mbuf * 1588 key_sp2msg(sp) 1589 struct secpolicy *sp; 1590 { 1591 struct sadb_x_policy *xpl; 1592 int tlen; 1593 caddr_t p; 1594 struct mbuf *m; 1595 1596 IPSEC_ASSERT(sp != NULL, ("null policy")); 1597 1598 tlen = key_getspreqmsglen(sp); 1599 1600 m = key_alloc_mbuf(tlen); 1601 if (!m || m->m_next) { /*XXX*/ 1602 if (m) 1603 m_freem(m); 1604 return NULL; 1605 } 1606 1607 m->m_len = tlen; 1608 m->m_next = NULL; 1609 xpl = mtod(m, struct sadb_x_policy *); 1610 bzero(xpl, tlen); 1611 1612 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1613 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1614 xpl->sadb_x_policy_type = sp->policy; 1615 xpl->sadb_x_policy_dir = sp->spidx.dir; 1616 xpl->sadb_x_policy_id = sp->id; 1617 p = (caddr_t)xpl + sizeof(*xpl); 1618 1619 /* if is the policy for ipsec ? */ 1620 if (sp->policy == IPSEC_POLICY_IPSEC) { 1621 struct sadb_x_ipsecrequest *xisr; 1622 struct ipsecrequest *isr; 1623 1624 for (isr = sp->req; isr != NULL; isr = isr->next) { 1625 1626 xisr = (struct sadb_x_ipsecrequest *)p; 1627 1628 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1629 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1630 xisr->sadb_x_ipsecrequest_level = isr->level; 1631 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1632 1633 p += sizeof(*xisr); 1634 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1635 p += isr->saidx.src.sa.sa_len; 1636 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1637 p += isr->saidx.src.sa.sa_len; 1638 1639 xisr->sadb_x_ipsecrequest_len = 1640 PFKEY_ALIGN8(sizeof(*xisr) 1641 + isr->saidx.src.sa.sa_len 1642 + isr->saidx.dst.sa.sa_len); 1643 } 1644 } 1645 1646 return m; 1647 } 1648 1649 /* m will not be freed nor modified */ 1650 static struct mbuf * 1651 #ifdef __STDC__ 1652 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1653 int ndeep, int nitem, ...) 1654 #else 1655 key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1656 struct mbuf *m; 1657 const struct sadb_msghdr *mhp; 1658 int ndeep; 1659 int nitem; 1660 va_dcl 1661 #endif 1662 { 1663 va_list ap; 1664 int idx; 1665 int i; 1666 struct mbuf *result = NULL, *n; 1667 int len; 1668 1669 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1670 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1671 1672 va_start(ap, nitem); 1673 for (i = 0; i < nitem; i++) { 1674 idx = va_arg(ap, int); 1675 if (idx < 0 || idx > SADB_EXT_MAX) 1676 goto fail; 1677 /* don't attempt to pull empty extension */ 1678 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1679 continue; 1680 if (idx != SADB_EXT_RESERVED && 1681 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1682 continue; 1683 1684 if (idx == SADB_EXT_RESERVED) { 1685 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1686 1687 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1688 1689 MGETHDR(n, M_DONTWAIT, MT_DATA); 1690 if (!n) 1691 goto fail; 1692 n->m_len = len; 1693 n->m_next = NULL; 1694 m_copydata(m, 0, sizeof(struct sadb_msg), 1695 mtod(n, caddr_t)); 1696 } else if (i < ndeep) { 1697 len = mhp->extlen[idx]; 1698 n = key_alloc_mbuf(len); 1699 if (!n || n->m_next) { /*XXX*/ 1700 if (n) 1701 m_freem(n); 1702 goto fail; 1703 } 1704 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1705 mtod(n, caddr_t)); 1706 } else { 1707 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1708 M_DONTWAIT); 1709 } 1710 if (n == NULL) 1711 goto fail; 1712 1713 if (result) 1714 m_cat(result, n); 1715 else 1716 result = n; 1717 } 1718 va_end(ap); 1719 1720 if ((result->m_flags & M_PKTHDR) != 0) { 1721 result->m_pkthdr.len = 0; 1722 for (n = result; n; n = n->m_next) 1723 result->m_pkthdr.len += n->m_len; 1724 } 1725 1726 return result; 1727 1728 fail: 1729 m_freem(result); 1730 return NULL; 1731 } 1732 1733 /* 1734 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1735 * add an entry to SP database, when received 1736 * <base, address(SD), (lifetime(H),) policy> 1737 * from the user(?). 1738 * Adding to SP database, 1739 * and send 1740 * <base, address(SD), (lifetime(H),) policy> 1741 * to the socket which was send. 1742 * 1743 * SPDADD set a unique policy entry. 1744 * SPDSETIDX like SPDADD without a part of policy requests. 1745 * SPDUPDATE replace a unique policy entry. 1746 * 1747 * m will always be freed. 1748 */ 1749 static int 1750 key_spdadd(so, m, mhp) 1751 struct socket *so; 1752 struct mbuf *m; 1753 const struct sadb_msghdr *mhp; 1754 { 1755 struct sadb_address *src0, *dst0; 1756 struct sadb_x_policy *xpl0, *xpl; 1757 struct sadb_lifetime *lft = NULL; 1758 struct secpolicyindex spidx; 1759 struct secpolicy *newsp; 1760 int error; 1761 1762 IPSEC_ASSERT(so != NULL, ("null socket")); 1763 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1764 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1765 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1766 1767 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1768 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1769 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1770 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1771 return key_senderror(so, m, EINVAL); 1772 } 1773 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1774 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1775 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1776 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1777 __func__)); 1778 return key_senderror(so, m, EINVAL); 1779 } 1780 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1781 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1782 < sizeof(struct sadb_lifetime)) { 1783 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1784 __func__)); 1785 return key_senderror(so, m, EINVAL); 1786 } 1787 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1788 } 1789 1790 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1791 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1792 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 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 newsp->state = IPSEC_SPSTATE_DEAD; 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 /* allocation new SP entry */ 1854 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1855 return key_senderror(so, m, error); 1856 } 1857 1858 if ((newsp->id = key_getnewspid()) == 0) { 1859 _key_delsp(newsp); 1860 return key_senderror(so, m, ENOBUFS); 1861 } 1862 1863 /* XXX boundary check against sa_len */ 1864 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1865 src0 + 1, 1866 dst0 + 1, 1867 src0->sadb_address_prefixlen, 1868 dst0->sadb_address_prefixlen, 1869 src0->sadb_address_proto, 1870 &newsp->spidx); 1871 1872 /* sanity check on addr pair */ 1873 if (((struct sockaddr *)(src0 + 1))->sa_family != 1874 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1875 _key_delsp(newsp); 1876 return key_senderror(so, m, EINVAL); 1877 } 1878 if (((struct sockaddr *)(src0 + 1))->sa_len != 1879 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1880 _key_delsp(newsp); 1881 return key_senderror(so, m, EINVAL); 1882 } 1883 #if 1 1884 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1885 struct sockaddr *sa; 1886 sa = (struct sockaddr *)(src0 + 1); 1887 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1888 _key_delsp(newsp); 1889 return key_senderror(so, m, EINVAL); 1890 } 1891 } 1892 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1893 struct sockaddr *sa; 1894 sa = (struct sockaddr *)(dst0 + 1); 1895 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1896 _key_delsp(newsp); 1897 return key_senderror(so, m, EINVAL); 1898 } 1899 } 1900 #endif 1901 1902 newsp->created = time_second; 1903 newsp->lastused = newsp->created; 1904 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1905 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1906 1907 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1908 newsp->state = IPSEC_SPSTATE_ALIVE; 1909 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1910 1911 /* delete the entry in spacqtree */ 1912 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1913 struct secspacq *spacq = key_getspacq(&spidx); 1914 if (spacq != NULL) { 1915 /* reset counter in order to deletion by timehandler. */ 1916 spacq->created = time_second; 1917 spacq->count = 0; 1918 SPACQ_UNLOCK(); 1919 } 1920 } 1921 1922 { 1923 struct mbuf *n, *mpolicy; 1924 struct sadb_msg *newmsg; 1925 int off; 1926 1927 /* create new sadb_msg to reply. */ 1928 if (lft) { 1929 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1930 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1931 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1932 } else { 1933 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1934 SADB_X_EXT_POLICY, 1935 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1936 } 1937 if (!n) 1938 return key_senderror(so, m, ENOBUFS); 1939 1940 if (n->m_len < sizeof(*newmsg)) { 1941 n = m_pullup(n, sizeof(*newmsg)); 1942 if (!n) 1943 return key_senderror(so, m, ENOBUFS); 1944 } 1945 newmsg = mtod(n, struct sadb_msg *); 1946 newmsg->sadb_msg_errno = 0; 1947 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1948 1949 off = 0; 1950 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1951 sizeof(*xpl), &off); 1952 if (mpolicy == NULL) { 1953 /* n is already freed */ 1954 return key_senderror(so, m, ENOBUFS); 1955 } 1956 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1957 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1958 m_freem(n); 1959 return key_senderror(so, m, EINVAL); 1960 } 1961 xpl->sadb_x_policy_id = newsp->id; 1962 1963 m_freem(m); 1964 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1965 } 1966 } 1967 1968 /* 1969 * get new policy id. 1970 * OUT: 1971 * 0: failure. 1972 * others: success. 1973 */ 1974 static u_int32_t 1975 key_getnewspid() 1976 { 1977 u_int32_t newid = 0; 1978 int count = V_key_spi_trycnt; /* XXX */ 1979 struct secpolicy *sp; 1980 1981 /* when requesting to allocate spi ranged */ 1982 while (count--) { 1983 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 1984 1985 if ((sp = key_getspbyid(newid)) == NULL) 1986 break; 1987 1988 KEY_FREESP(&sp); 1989 } 1990 1991 if (count == 0 || newid == 0) { 1992 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 1993 __func__)); 1994 return 0; 1995 } 1996 1997 return newid; 1998 } 1999 2000 /* 2001 * SADB_SPDDELETE processing 2002 * receive 2003 * <base, address(SD), policy(*)> 2004 * from the user(?), and set SADB_SASTATE_DEAD, 2005 * and send, 2006 * <base, address(SD), policy(*)> 2007 * to the ikmpd. 2008 * policy(*) including direction of policy. 2009 * 2010 * m will always be freed. 2011 */ 2012 static int 2013 key_spddelete(so, m, mhp) 2014 struct socket *so; 2015 struct mbuf *m; 2016 const struct sadb_msghdr *mhp; 2017 { 2018 struct sadb_address *src0, *dst0; 2019 struct sadb_x_policy *xpl0; 2020 struct secpolicyindex spidx; 2021 struct secpolicy *sp; 2022 2023 IPSEC_ASSERT(so != NULL, ("null so")); 2024 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2025 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2026 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2027 2028 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2029 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2030 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2031 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2032 __func__)); 2033 return key_senderror(so, m, EINVAL); 2034 } 2035 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2036 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2037 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2038 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2039 __func__)); 2040 return key_senderror(so, m, EINVAL); 2041 } 2042 2043 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2044 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2045 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2046 2047 /* make secindex */ 2048 /* XXX boundary check against sa_len */ 2049 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2050 src0 + 1, 2051 dst0 + 1, 2052 src0->sadb_address_prefixlen, 2053 dst0->sadb_address_prefixlen, 2054 src0->sadb_address_proto, 2055 &spidx); 2056 2057 /* checking the direciton. */ 2058 switch (xpl0->sadb_x_policy_dir) { 2059 case IPSEC_DIR_INBOUND: 2060 case IPSEC_DIR_OUTBOUND: 2061 break; 2062 default: 2063 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2064 return key_senderror(so, m, EINVAL); 2065 } 2066 2067 /* Is there SP in SPD ? */ 2068 if ((sp = key_getsp(&spidx)) == NULL) { 2069 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2070 return key_senderror(so, m, EINVAL); 2071 } 2072 2073 /* save policy id to buffer to be returned. */ 2074 xpl0->sadb_x_policy_id = sp->id; 2075 2076 sp->state = IPSEC_SPSTATE_DEAD; 2077 KEY_FREESP(&sp); 2078 2079 { 2080 struct mbuf *n; 2081 struct sadb_msg *newmsg; 2082 2083 /* create new sadb_msg to reply. */ 2084 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2085 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2086 if (!n) 2087 return key_senderror(so, m, ENOBUFS); 2088 2089 newmsg = mtod(n, struct sadb_msg *); 2090 newmsg->sadb_msg_errno = 0; 2091 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2092 2093 m_freem(m); 2094 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2095 } 2096 } 2097 2098 /* 2099 * SADB_SPDDELETE2 processing 2100 * receive 2101 * <base, policy(*)> 2102 * from the user(?), and set SADB_SASTATE_DEAD, 2103 * and send, 2104 * <base, policy(*)> 2105 * to the ikmpd. 2106 * policy(*) including direction of policy. 2107 * 2108 * m will always be freed. 2109 */ 2110 static int 2111 key_spddelete2(so, m, mhp) 2112 struct socket *so; 2113 struct mbuf *m; 2114 const struct sadb_msghdr *mhp; 2115 { 2116 u_int32_t id; 2117 struct secpolicy *sp; 2118 2119 IPSEC_ASSERT(so != NULL, ("null socket")); 2120 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2121 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2122 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2123 2124 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2125 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2126 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2127 return key_senderror(so, m, EINVAL); 2128 } 2129 2130 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2131 2132 /* Is there SP in SPD ? */ 2133 if ((sp = key_getspbyid(id)) == NULL) { 2134 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2135 return key_senderror(so, m, EINVAL); 2136 } 2137 2138 sp->state = IPSEC_SPSTATE_DEAD; 2139 KEY_FREESP(&sp); 2140 2141 { 2142 struct mbuf *n, *nn; 2143 struct sadb_msg *newmsg; 2144 int off, len; 2145 2146 /* create new sadb_msg to reply. */ 2147 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2148 2149 MGETHDR(n, M_DONTWAIT, MT_DATA); 2150 if (n && len > MHLEN) { 2151 MCLGET(n, M_DONTWAIT); 2152 if ((n->m_flags & M_EXT) == 0) { 2153 m_freem(n); 2154 n = NULL; 2155 } 2156 } 2157 if (!n) 2158 return key_senderror(so, m, ENOBUFS); 2159 2160 n->m_len = len; 2161 n->m_next = NULL; 2162 off = 0; 2163 2164 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2165 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2166 2167 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2168 off, len)); 2169 2170 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2171 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2172 if (!n->m_next) { 2173 m_freem(n); 2174 return key_senderror(so, m, ENOBUFS); 2175 } 2176 2177 n->m_pkthdr.len = 0; 2178 for (nn = n; nn; nn = nn->m_next) 2179 n->m_pkthdr.len += nn->m_len; 2180 2181 newmsg = mtod(n, struct sadb_msg *); 2182 newmsg->sadb_msg_errno = 0; 2183 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2184 2185 m_freem(m); 2186 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2187 } 2188 } 2189 2190 /* 2191 * SADB_X_GET processing 2192 * receive 2193 * <base, policy(*)> 2194 * from the user(?), 2195 * and send, 2196 * <base, address(SD), policy> 2197 * to the ikmpd. 2198 * policy(*) including direction of policy. 2199 * 2200 * m will always be freed. 2201 */ 2202 static int 2203 key_spdget(so, m, mhp) 2204 struct socket *so; 2205 struct mbuf *m; 2206 const struct sadb_msghdr *mhp; 2207 { 2208 u_int32_t id; 2209 struct secpolicy *sp; 2210 struct mbuf *n; 2211 2212 IPSEC_ASSERT(so != NULL, ("null socket")); 2213 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2214 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2215 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2216 2217 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2218 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2219 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2220 __func__)); 2221 return key_senderror(so, m, EINVAL); 2222 } 2223 2224 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2225 2226 /* Is there SP in SPD ? */ 2227 if ((sp = key_getspbyid(id)) == NULL) { 2228 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2229 return key_senderror(so, m, ENOENT); 2230 } 2231 2232 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2233 if (n != NULL) { 2234 m_freem(m); 2235 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2236 } else 2237 return key_senderror(so, m, ENOBUFS); 2238 } 2239 2240 /* 2241 * SADB_X_SPDACQUIRE processing. 2242 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2243 * send 2244 * <base, policy(*)> 2245 * to KMD, and expect to receive 2246 * <base> with SADB_X_SPDACQUIRE if error occured, 2247 * or 2248 * <base, policy> 2249 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2250 * policy(*) is without policy requests. 2251 * 2252 * 0 : succeed 2253 * others: error number 2254 */ 2255 int 2256 key_spdacquire(sp) 2257 struct secpolicy *sp; 2258 { 2259 struct mbuf *result = NULL, *m; 2260 struct secspacq *newspacq; 2261 2262 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2263 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2264 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2265 ("policy not IPSEC %u", sp->policy)); 2266 2267 /* Get an entry to check whether sent message or not. */ 2268 newspacq = key_getspacq(&sp->spidx); 2269 if (newspacq != NULL) { 2270 if (V_key_blockacq_count < newspacq->count) { 2271 /* reset counter and do send message. */ 2272 newspacq->count = 0; 2273 } else { 2274 /* increment counter and do nothing. */ 2275 newspacq->count++; 2276 return 0; 2277 } 2278 SPACQ_UNLOCK(); 2279 } else { 2280 /* make new entry for blocking to send SADB_ACQUIRE. */ 2281 newspacq = key_newspacq(&sp->spidx); 2282 if (newspacq == NULL) 2283 return ENOBUFS; 2284 } 2285 2286 /* create new sadb_msg to reply. */ 2287 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2288 if (!m) 2289 return ENOBUFS; 2290 2291 result = m; 2292 2293 result->m_pkthdr.len = 0; 2294 for (m = result; m; m = m->m_next) 2295 result->m_pkthdr.len += m->m_len; 2296 2297 mtod(result, struct sadb_msg *)->sadb_msg_len = 2298 PFKEY_UNIT64(result->m_pkthdr.len); 2299 2300 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2301 } 2302 2303 /* 2304 * SADB_SPDFLUSH processing 2305 * receive 2306 * <base> 2307 * from the user, and free all entries in secpctree. 2308 * and send, 2309 * <base> 2310 * to the user. 2311 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2312 * 2313 * m will always be freed. 2314 */ 2315 static int 2316 key_spdflush(so, m, mhp) 2317 struct socket *so; 2318 struct mbuf *m; 2319 const struct sadb_msghdr *mhp; 2320 { 2321 struct sadb_msg *newmsg; 2322 struct secpolicy *sp; 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 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2334 SPTREE_LOCK(); 2335 LIST_FOREACH(sp, &V_sptree[dir], chain) 2336 sp->state = IPSEC_SPSTATE_DEAD; 2337 SPTREE_UNLOCK(); 2338 } 2339 2340 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2341 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2342 return key_senderror(so, m, ENOBUFS); 2343 } 2344 2345 if (m->m_next) 2346 m_freem(m->m_next); 2347 m->m_next = NULL; 2348 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2349 newmsg = mtod(m, struct sadb_msg *); 2350 newmsg->sadb_msg_errno = 0; 2351 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2352 2353 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2354 } 2355 2356 /* 2357 * SADB_SPDDUMP processing 2358 * receive 2359 * <base> 2360 * from the user, and dump all SP leaves 2361 * and send, 2362 * <base> ..... 2363 * to the ikmpd. 2364 * 2365 * m will always be freed. 2366 */ 2367 static int 2368 key_spddump(so, m, mhp) 2369 struct socket *so; 2370 struct mbuf *m; 2371 const struct sadb_msghdr *mhp; 2372 { 2373 struct secpolicy *sp; 2374 int cnt; 2375 u_int dir; 2376 struct mbuf *n; 2377 2378 IPSEC_ASSERT(so != NULL, ("null socket")); 2379 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2380 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2381 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2382 2383 /* search SPD entry and get buffer size. */ 2384 cnt = 0; 2385 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2386 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2387 cnt++; 2388 } 2389 } 2390 2391 if (cnt == 0) 2392 return key_senderror(so, m, ENOENT); 2393 2394 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2395 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2396 --cnt; 2397 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2398 mhp->msg->sadb_msg_pid); 2399 2400 if (n) 2401 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2402 } 2403 } 2404 2405 m_freem(m); 2406 return 0; 2407 } 2408 2409 static struct mbuf * 2410 key_setdumpsp(sp, type, seq, pid) 2411 struct secpolicy *sp; 2412 u_int8_t type; 2413 u_int32_t seq, pid; 2414 { 2415 struct mbuf *result = NULL, *m; 2416 struct seclifetime lt; 2417 2418 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2419 if (!m) 2420 goto fail; 2421 result = m; 2422 2423 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2424 &sp->spidx.src.sa, sp->spidx.prefs, 2425 sp->spidx.ul_proto); 2426 if (!m) 2427 goto fail; 2428 m_cat(result, m); 2429 2430 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2431 &sp->spidx.dst.sa, sp->spidx.prefd, 2432 sp->spidx.ul_proto); 2433 if (!m) 2434 goto fail; 2435 m_cat(result, m); 2436 2437 m = key_sp2msg(sp); 2438 if (!m) 2439 goto fail; 2440 m_cat(result, m); 2441 2442 if(sp->lifetime){ 2443 lt.addtime=sp->created; 2444 lt.usetime= sp->lastused; 2445 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2446 if (!m) 2447 goto fail; 2448 m_cat(result, m); 2449 2450 lt.addtime=sp->lifetime; 2451 lt.usetime= sp->validtime; 2452 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2453 if (!m) 2454 goto fail; 2455 m_cat(result, m); 2456 } 2457 2458 if ((result->m_flags & M_PKTHDR) == 0) 2459 goto fail; 2460 2461 if (result->m_len < sizeof(struct sadb_msg)) { 2462 result = m_pullup(result, sizeof(struct sadb_msg)); 2463 if (result == NULL) 2464 goto fail; 2465 } 2466 2467 result->m_pkthdr.len = 0; 2468 for (m = result; m; m = m->m_next) 2469 result->m_pkthdr.len += m->m_len; 2470 2471 mtod(result, struct sadb_msg *)->sadb_msg_len = 2472 PFKEY_UNIT64(result->m_pkthdr.len); 2473 2474 return result; 2475 2476 fail: 2477 m_freem(result); 2478 return NULL; 2479 } 2480 2481 /* 2482 * get PFKEY message length for security policy and request. 2483 */ 2484 static u_int 2485 key_getspreqmsglen(sp) 2486 struct secpolicy *sp; 2487 { 2488 u_int tlen; 2489 2490 tlen = sizeof(struct sadb_x_policy); 2491 2492 /* if is the policy for ipsec ? */ 2493 if (sp->policy != IPSEC_POLICY_IPSEC) 2494 return tlen; 2495 2496 /* get length of ipsec requests */ 2497 { 2498 struct ipsecrequest *isr; 2499 int len; 2500 2501 for (isr = sp->req; isr != NULL; isr = isr->next) { 2502 len = sizeof(struct sadb_x_ipsecrequest) 2503 + isr->saidx.src.sa.sa_len 2504 + isr->saidx.dst.sa.sa_len; 2505 2506 tlen += PFKEY_ALIGN8(len); 2507 } 2508 } 2509 2510 return tlen; 2511 } 2512 2513 /* 2514 * SADB_SPDEXPIRE processing 2515 * send 2516 * <base, address(SD), lifetime(CH), policy> 2517 * to KMD by PF_KEY. 2518 * 2519 * OUT: 0 : succeed 2520 * others : error number 2521 */ 2522 static int 2523 key_spdexpire(sp) 2524 struct secpolicy *sp; 2525 { 2526 struct mbuf *result = NULL, *m; 2527 int len; 2528 int error = -1; 2529 struct sadb_lifetime *lt; 2530 2531 /* XXX: Why do we lock ? */ 2532 2533 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2534 2535 /* set msg header */ 2536 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2537 if (!m) { 2538 error = ENOBUFS; 2539 goto fail; 2540 } 2541 result = m; 2542 2543 /* create lifetime extension (current and hard) */ 2544 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2545 m = key_alloc_mbuf(len); 2546 if (!m || m->m_next) { /*XXX*/ 2547 if (m) 2548 m_freem(m); 2549 error = ENOBUFS; 2550 goto fail; 2551 } 2552 bzero(mtod(m, caddr_t), len); 2553 lt = mtod(m, struct sadb_lifetime *); 2554 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2555 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2556 lt->sadb_lifetime_allocations = 0; 2557 lt->sadb_lifetime_bytes = 0; 2558 lt->sadb_lifetime_addtime = sp->created; 2559 lt->sadb_lifetime_usetime = sp->lastused; 2560 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2561 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2562 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2563 lt->sadb_lifetime_allocations = 0; 2564 lt->sadb_lifetime_bytes = 0; 2565 lt->sadb_lifetime_addtime = sp->lifetime; 2566 lt->sadb_lifetime_usetime = sp->validtime; 2567 m_cat(result, m); 2568 2569 /* set sadb_address for source */ 2570 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2571 &sp->spidx.src.sa, 2572 sp->spidx.prefs, sp->spidx.ul_proto); 2573 if (!m) { 2574 error = ENOBUFS; 2575 goto fail; 2576 } 2577 m_cat(result, m); 2578 2579 /* set sadb_address for destination */ 2580 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2581 &sp->spidx.dst.sa, 2582 sp->spidx.prefd, sp->spidx.ul_proto); 2583 if (!m) { 2584 error = ENOBUFS; 2585 goto fail; 2586 } 2587 m_cat(result, m); 2588 2589 /* set secpolicy */ 2590 m = key_sp2msg(sp); 2591 if (!m) { 2592 error = ENOBUFS; 2593 goto fail; 2594 } 2595 m_cat(result, m); 2596 2597 if ((result->m_flags & M_PKTHDR) == 0) { 2598 error = EINVAL; 2599 goto fail; 2600 } 2601 2602 if (result->m_len < sizeof(struct sadb_msg)) { 2603 result = m_pullup(result, sizeof(struct sadb_msg)); 2604 if (result == NULL) { 2605 error = ENOBUFS; 2606 goto fail; 2607 } 2608 } 2609 2610 result->m_pkthdr.len = 0; 2611 for (m = result; m; m = m->m_next) 2612 result->m_pkthdr.len += m->m_len; 2613 2614 mtod(result, struct sadb_msg *)->sadb_msg_len = 2615 PFKEY_UNIT64(result->m_pkthdr.len); 2616 2617 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2618 2619 fail: 2620 if (result) 2621 m_freem(result); 2622 return error; 2623 } 2624 2625 /* %%% SAD management */ 2626 /* 2627 * allocating a memory for new SA head, and copy from the values of mhp. 2628 * OUT: NULL : failure due to the lack of memory. 2629 * others : pointer to new SA head. 2630 */ 2631 static struct secashead * 2632 key_newsah(saidx) 2633 struct secasindex *saidx; 2634 { 2635 struct secashead *newsah; 2636 2637 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2638 2639 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2640 if (newsah != NULL) { 2641 int i; 2642 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2643 LIST_INIT(&newsah->savtree[i]); 2644 newsah->saidx = *saidx; 2645 2646 /* add to saidxtree */ 2647 newsah->state = SADB_SASTATE_MATURE; 2648 2649 SAHTREE_LOCK(); 2650 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2651 SAHTREE_UNLOCK(); 2652 } 2653 return(newsah); 2654 } 2655 2656 /* 2657 * delete SA index and all SA registerd. 2658 */ 2659 static void 2660 key_delsah(sah) 2661 struct secashead *sah; 2662 { 2663 struct secasvar *sav, *nextsav; 2664 u_int stateidx; 2665 int zombie = 0; 2666 2667 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2668 SAHTREE_LOCK_ASSERT(); 2669 2670 /* searching all SA registerd in the secindex. */ 2671 for (stateidx = 0; 2672 stateidx < _ARRAYLEN(V_saorder_state_any); 2673 stateidx++) { 2674 u_int state = V_saorder_state_any[stateidx]; 2675 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2676 if (sav->refcnt == 0) { 2677 /* sanity check */ 2678 KEY_CHKSASTATE(state, sav->state, __func__); 2679 KEY_FREESAV(&sav); 2680 } else { 2681 /* give up to delete this sa */ 2682 zombie++; 2683 } 2684 } 2685 } 2686 if (!zombie) { /* delete only if there are savs */ 2687 /* remove from tree of SA index */ 2688 if (__LIST_CHAINED(sah)) 2689 LIST_REMOVE(sah, chain); 2690 if (sah->sa_route.ro_rt) { 2691 RTFREE(sah->sa_route.ro_rt); 2692 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2693 } 2694 free(sah, M_IPSEC_SAH); 2695 } 2696 } 2697 2698 /* 2699 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2700 * and copy the values of mhp into new buffer. 2701 * When SAD message type is GETSPI: 2702 * to set sequence number from acq_seq++, 2703 * to set zero to SPI. 2704 * not to call key_setsava(). 2705 * OUT: NULL : fail 2706 * others : pointer to new secasvar. 2707 * 2708 * does not modify mbuf. does not free mbuf on error. 2709 */ 2710 static struct secasvar * 2711 key_newsav(m, mhp, sah, errp, where, tag) 2712 struct mbuf *m; 2713 const struct sadb_msghdr *mhp; 2714 struct secashead *sah; 2715 int *errp; 2716 const char* where; 2717 int tag; 2718 { 2719 struct secasvar *newsav; 2720 const struct sadb_sa *xsa; 2721 2722 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2723 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2724 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2725 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2726 2727 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2728 if (newsav == NULL) { 2729 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2730 *errp = ENOBUFS; 2731 goto done; 2732 } 2733 2734 switch (mhp->msg->sadb_msg_type) { 2735 case SADB_GETSPI: 2736 newsav->spi = 0; 2737 2738 #ifdef IPSEC_DOSEQCHECK 2739 /* sync sequence number */ 2740 if (mhp->msg->sadb_msg_seq == 0) 2741 newsav->seq = 2742 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2743 else 2744 #endif 2745 newsav->seq = mhp->msg->sadb_msg_seq; 2746 break; 2747 2748 case SADB_ADD: 2749 /* sanity check */ 2750 if (mhp->ext[SADB_EXT_SA] == NULL) { 2751 free(newsav, M_IPSEC_SA); 2752 newsav = NULL; 2753 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2754 __func__)); 2755 *errp = EINVAL; 2756 goto done; 2757 } 2758 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2759 newsav->spi = xsa->sadb_sa_spi; 2760 newsav->seq = mhp->msg->sadb_msg_seq; 2761 break; 2762 default: 2763 free(newsav, M_IPSEC_SA); 2764 newsav = NULL; 2765 *errp = EINVAL; 2766 goto done; 2767 } 2768 2769 2770 /* copy sav values */ 2771 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2772 *errp = key_setsaval(newsav, m, mhp); 2773 if (*errp) { 2774 free(newsav, M_IPSEC_SA); 2775 newsav = NULL; 2776 goto done; 2777 } 2778 } 2779 2780 SECASVAR_LOCK_INIT(newsav); 2781 2782 /* reset created */ 2783 newsav->created = time_second; 2784 newsav->pid = mhp->msg->sadb_msg_pid; 2785 2786 /* add to satree */ 2787 newsav->sah = sah; 2788 sa_initref(newsav); 2789 newsav->state = SADB_SASTATE_LARVAL; 2790 2791 /* XXX locking??? */ 2792 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2793 secasvar, chain); 2794 done: 2795 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2796 printf("DP %s from %s:%u return SP:%p\n", __func__, 2797 where, tag, newsav)); 2798 2799 return newsav; 2800 } 2801 2802 /* 2803 * free() SA variable entry. 2804 */ 2805 static void 2806 key_cleansav(struct secasvar *sav) 2807 { 2808 /* 2809 * Cleanup xform state. Note that zeroize'ing causes the 2810 * keys to be cleared; otherwise we must do it ourself. 2811 */ 2812 if (sav->tdb_xform != NULL) { 2813 sav->tdb_xform->xf_zeroize(sav); 2814 sav->tdb_xform = NULL; 2815 } else { 2816 KASSERT(sav->iv == NULL, ("iv but no xform")); 2817 if (sav->key_auth != NULL) 2818 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2819 if (sav->key_enc != NULL) 2820 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2821 } 2822 if (sav->key_auth != NULL) { 2823 if (sav->key_auth->key_data != NULL) 2824 free(sav->key_auth->key_data, M_IPSEC_MISC); 2825 free(sav->key_auth, M_IPSEC_MISC); 2826 sav->key_auth = NULL; 2827 } 2828 if (sav->key_enc != NULL) { 2829 if (sav->key_enc->key_data != NULL) 2830 free(sav->key_enc->key_data, M_IPSEC_MISC); 2831 free(sav->key_enc, M_IPSEC_MISC); 2832 sav->key_enc = NULL; 2833 } 2834 if (sav->sched) { 2835 bzero(sav->sched, sav->schedlen); 2836 free(sav->sched, M_IPSEC_MISC); 2837 sav->sched = NULL; 2838 } 2839 if (sav->replay != NULL) { 2840 free(sav->replay, M_IPSEC_MISC); 2841 sav->replay = NULL; 2842 } 2843 if (sav->lft_c != NULL) { 2844 free(sav->lft_c, M_IPSEC_MISC); 2845 sav->lft_c = NULL; 2846 } 2847 if (sav->lft_h != NULL) { 2848 free(sav->lft_h, M_IPSEC_MISC); 2849 sav->lft_h = NULL; 2850 } 2851 if (sav->lft_s != NULL) { 2852 free(sav->lft_s, M_IPSEC_MISC); 2853 sav->lft_s = NULL; 2854 } 2855 } 2856 2857 /* 2858 * free() SA variable entry. 2859 */ 2860 static void 2861 key_delsav(sav) 2862 struct secasvar *sav; 2863 { 2864 IPSEC_ASSERT(sav != NULL, ("null sav")); 2865 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2866 2867 /* remove from SA header */ 2868 if (__LIST_CHAINED(sav)) 2869 LIST_REMOVE(sav, chain); 2870 key_cleansav(sav); 2871 SECASVAR_LOCK_DESTROY(sav); 2872 free(sav, M_IPSEC_SA); 2873 } 2874 2875 /* 2876 * search SAD. 2877 * OUT: 2878 * NULL : not found 2879 * others : found, pointer to a SA. 2880 */ 2881 static struct secashead * 2882 key_getsah(saidx) 2883 struct secasindex *saidx; 2884 { 2885 struct secashead *sah; 2886 2887 SAHTREE_LOCK(); 2888 LIST_FOREACH(sah, &V_sahtree, chain) { 2889 if (sah->state == SADB_SASTATE_DEAD) 2890 continue; 2891 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2892 break; 2893 } 2894 SAHTREE_UNLOCK(); 2895 2896 return sah; 2897 } 2898 2899 /* 2900 * check not to be duplicated SPI. 2901 * NOTE: this function is too slow due to searching all SAD. 2902 * OUT: 2903 * NULL : not found 2904 * others : found, pointer to a SA. 2905 */ 2906 static struct secasvar * 2907 key_checkspidup(saidx, spi) 2908 struct secasindex *saidx; 2909 u_int32_t spi; 2910 { 2911 struct secashead *sah; 2912 struct secasvar *sav; 2913 2914 /* check address family */ 2915 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2916 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2917 __func__)); 2918 return NULL; 2919 } 2920 2921 sav = NULL; 2922 /* check all SAD */ 2923 SAHTREE_LOCK(); 2924 LIST_FOREACH(sah, &V_sahtree, chain) { 2925 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2926 continue; 2927 sav = key_getsavbyspi(sah, spi); 2928 if (sav != NULL) 2929 break; 2930 } 2931 SAHTREE_UNLOCK(); 2932 2933 return sav; 2934 } 2935 2936 /* 2937 * search SAD litmited alive SA, protocol, SPI. 2938 * OUT: 2939 * NULL : not found 2940 * others : found, pointer to a SA. 2941 */ 2942 static struct secasvar * 2943 key_getsavbyspi(sah, spi) 2944 struct secashead *sah; 2945 u_int32_t spi; 2946 { 2947 struct secasvar *sav; 2948 u_int stateidx, state; 2949 2950 sav = NULL; 2951 SAHTREE_LOCK_ASSERT(); 2952 /* search all status */ 2953 for (stateidx = 0; 2954 stateidx < _ARRAYLEN(V_saorder_state_alive); 2955 stateidx++) { 2956 2957 state = V_saorder_state_alive[stateidx]; 2958 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2959 2960 /* sanity check */ 2961 if (sav->state != state) { 2962 ipseclog((LOG_DEBUG, "%s: " 2963 "invalid sav->state (queue: %d SA: %d)\n", 2964 __func__, state, sav->state)); 2965 continue; 2966 } 2967 2968 if (sav->spi == spi) 2969 return sav; 2970 } 2971 } 2972 2973 return NULL; 2974 } 2975 2976 /* 2977 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 2978 * You must update these if need. 2979 * OUT: 0: success. 2980 * !0: failure. 2981 * 2982 * does not modify mbuf. does not free mbuf on error. 2983 */ 2984 static int 2985 key_setsaval(sav, m, mhp) 2986 struct secasvar *sav; 2987 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 3011 /* SA */ 3012 if (mhp->ext[SADB_EXT_SA] != NULL) { 3013 const struct sadb_sa *sa0; 3014 3015 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3016 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3017 error = EINVAL; 3018 goto fail; 3019 } 3020 3021 sav->alg_auth = sa0->sadb_sa_auth; 3022 sav->alg_enc = sa0->sadb_sa_encrypt; 3023 sav->flags = sa0->sadb_sa_flags; 3024 3025 /* replay window */ 3026 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3027 sav->replay = (struct secreplay *) 3028 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3029 if (sav->replay == NULL) { 3030 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3031 __func__)); 3032 error = ENOBUFS; 3033 goto fail; 3034 } 3035 if (sa0->sadb_sa_replay != 0) 3036 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3037 sav->replay->wsize = sa0->sadb_sa_replay; 3038 } 3039 } 3040 3041 /* Authentication keys */ 3042 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3043 const struct sadb_key *key0; 3044 int len; 3045 3046 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3047 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3048 3049 error = 0; 3050 if (len < sizeof(*key0)) { 3051 error = EINVAL; 3052 goto fail; 3053 } 3054 switch (mhp->msg->sadb_msg_satype) { 3055 case SADB_SATYPE_AH: 3056 case SADB_SATYPE_ESP: 3057 case SADB_X_SATYPE_TCPSIGNATURE: 3058 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3059 sav->alg_auth != SADB_X_AALG_NULL) 3060 error = EINVAL; 3061 break; 3062 case SADB_X_SATYPE_IPCOMP: 3063 default: 3064 error = EINVAL; 3065 break; 3066 } 3067 if (error) { 3068 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3069 __func__)); 3070 goto fail; 3071 } 3072 3073 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3074 M_IPSEC_MISC); 3075 if (sav->key_auth == NULL ) { 3076 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3077 __func__)); 3078 error = ENOBUFS; 3079 goto fail; 3080 } 3081 } 3082 3083 /* Encryption key */ 3084 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3085 const struct sadb_key *key0; 3086 int len; 3087 3088 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3089 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3090 3091 error = 0; 3092 if (len < sizeof(*key0)) { 3093 error = EINVAL; 3094 goto fail; 3095 } 3096 switch (mhp->msg->sadb_msg_satype) { 3097 case SADB_SATYPE_ESP: 3098 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3099 sav->alg_enc != SADB_EALG_NULL) { 3100 error = EINVAL; 3101 break; 3102 } 3103 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3104 len, 3105 M_IPSEC_MISC); 3106 if (sav->key_enc == NULL) { 3107 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3108 __func__)); 3109 error = ENOBUFS; 3110 goto fail; 3111 } 3112 break; 3113 case SADB_X_SATYPE_IPCOMP: 3114 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3115 error = EINVAL; 3116 sav->key_enc = NULL; /*just in case*/ 3117 break; 3118 case SADB_SATYPE_AH: 3119 case SADB_X_SATYPE_TCPSIGNATURE: 3120 default: 3121 error = EINVAL; 3122 break; 3123 } 3124 if (error) { 3125 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3126 __func__)); 3127 goto fail; 3128 } 3129 } 3130 3131 /* set iv */ 3132 sav->ivlen = 0; 3133 3134 switch (mhp->msg->sadb_msg_satype) { 3135 case SADB_SATYPE_AH: 3136 error = xform_init(sav, XF_AH); 3137 break; 3138 case SADB_SATYPE_ESP: 3139 error = xform_init(sav, XF_ESP); 3140 break; 3141 case SADB_X_SATYPE_IPCOMP: 3142 error = xform_init(sav, XF_IPCOMP); 3143 break; 3144 case SADB_X_SATYPE_TCPSIGNATURE: 3145 error = xform_init(sav, XF_TCPSIGNATURE); 3146 break; 3147 } 3148 if (error) { 3149 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3150 __func__, mhp->msg->sadb_msg_satype)); 3151 goto fail; 3152 } 3153 3154 /* reset created */ 3155 sav->created = time_second; 3156 3157 /* make lifetime for CURRENT */ 3158 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3159 if (sav->lft_c == NULL) { 3160 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3161 error = ENOBUFS; 3162 goto fail; 3163 } 3164 3165 sav->lft_c->allocations = 0; 3166 sav->lft_c->bytes = 0; 3167 sav->lft_c->addtime = time_second; 3168 sav->lft_c->usetime = 0; 3169 3170 /* lifetimes for HARD and SOFT */ 3171 { 3172 const struct sadb_lifetime *lft0; 3173 3174 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3175 if (lft0 != NULL) { 3176 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3177 error = EINVAL; 3178 goto fail; 3179 } 3180 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3181 if (sav->lft_h == NULL) { 3182 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3183 error = ENOBUFS; 3184 goto fail; 3185 } 3186 /* to be initialize ? */ 3187 } 3188 3189 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3190 if (lft0 != NULL) { 3191 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3192 error = EINVAL; 3193 goto fail; 3194 } 3195 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3196 if (sav->lft_s == NULL) { 3197 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3198 error = ENOBUFS; 3199 goto fail; 3200 } 3201 /* to be initialize ? */ 3202 } 3203 } 3204 3205 return 0; 3206 3207 fail: 3208 /* initialization */ 3209 key_cleansav(sav); 3210 3211 return error; 3212 } 3213 3214 /* 3215 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3216 * OUT: 0: valid 3217 * other: errno 3218 */ 3219 static int 3220 key_mature(struct secasvar *sav) 3221 { 3222 int error; 3223 3224 /* check SPI value */ 3225 switch (sav->sah->saidx.proto) { 3226 case IPPROTO_ESP: 3227 case IPPROTO_AH: 3228 /* 3229 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3230 * 1-255 reserved by IANA for future use, 3231 * 0 for implementation specific, local use. 3232 */ 3233 if (ntohl(sav->spi) <= 255) { 3234 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3235 __func__, (u_int32_t)ntohl(sav->spi))); 3236 return EINVAL; 3237 } 3238 break; 3239 } 3240 3241 /* check satype */ 3242 switch (sav->sah->saidx.proto) { 3243 case IPPROTO_ESP: 3244 /* check flags */ 3245 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3246 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3247 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3248 "given to old-esp.\n", __func__)); 3249 return EINVAL; 3250 } 3251 error = xform_init(sav, XF_ESP); 3252 break; 3253 case IPPROTO_AH: 3254 /* check flags */ 3255 if (sav->flags & SADB_X_EXT_DERIV) { 3256 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3257 "given to AH SA.\n", __func__)); 3258 return EINVAL; 3259 } 3260 if (sav->alg_enc != SADB_EALG_NONE) { 3261 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3262 "mismated.\n", __func__)); 3263 return(EINVAL); 3264 } 3265 error = xform_init(sav, XF_AH); 3266 break; 3267 case IPPROTO_IPCOMP: 3268 if (sav->alg_auth != SADB_AALG_NONE) { 3269 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3270 "mismated.\n", __func__)); 3271 return(EINVAL); 3272 } 3273 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3274 && ntohl(sav->spi) >= 0x10000) { 3275 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3276 __func__)); 3277 return(EINVAL); 3278 } 3279 error = xform_init(sav, XF_IPCOMP); 3280 break; 3281 case IPPROTO_TCP: 3282 if (sav->alg_enc != SADB_EALG_NONE) { 3283 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3284 "mismated.\n", __func__)); 3285 return(EINVAL); 3286 } 3287 error = xform_init(sav, XF_TCPSIGNATURE); 3288 break; 3289 default: 3290 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3291 error = EPROTONOSUPPORT; 3292 break; 3293 } 3294 if (error == 0) { 3295 SAHTREE_LOCK(); 3296 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3297 SAHTREE_UNLOCK(); 3298 } 3299 return (error); 3300 } 3301 3302 /* 3303 * subroutine for SADB_GET and SADB_DUMP. 3304 */ 3305 static struct mbuf * 3306 key_setdumpsa(sav, type, satype, seq, pid) 3307 struct secasvar *sav; 3308 u_int8_t type, satype; 3309 u_int32_t seq, pid; 3310 { 3311 struct mbuf *result = NULL, *tres = NULL, *m; 3312 int i; 3313 int dumporder[] = { 3314 SADB_EXT_SA, SADB_X_EXT_SA2, 3315 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3316 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3317 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3318 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3319 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3320 }; 3321 3322 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3323 if (m == NULL) 3324 goto fail; 3325 result = m; 3326 3327 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3328 m = NULL; 3329 switch (dumporder[i]) { 3330 case SADB_EXT_SA: 3331 m = key_setsadbsa(sav); 3332 if (!m) 3333 goto fail; 3334 break; 3335 3336 case SADB_X_EXT_SA2: 3337 m = key_setsadbxsa2(sav->sah->saidx.mode, 3338 sav->replay ? sav->replay->count : 0, 3339 sav->sah->saidx.reqid); 3340 if (!m) 3341 goto fail; 3342 break; 3343 3344 case SADB_EXT_ADDRESS_SRC: 3345 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3346 &sav->sah->saidx.src.sa, 3347 FULLMASK, IPSEC_ULPROTO_ANY); 3348 if (!m) 3349 goto fail; 3350 break; 3351 3352 case SADB_EXT_ADDRESS_DST: 3353 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3354 &sav->sah->saidx.dst.sa, 3355 FULLMASK, IPSEC_ULPROTO_ANY); 3356 if (!m) 3357 goto fail; 3358 break; 3359 3360 case SADB_EXT_KEY_AUTH: 3361 if (!sav->key_auth) 3362 continue; 3363 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3364 if (!m) 3365 goto fail; 3366 break; 3367 3368 case SADB_EXT_KEY_ENCRYPT: 3369 if (!sav->key_enc) 3370 continue; 3371 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3372 if (!m) 3373 goto fail; 3374 break; 3375 3376 case SADB_EXT_LIFETIME_CURRENT: 3377 if (!sav->lft_c) 3378 continue; 3379 m = key_setlifetime(sav->lft_c, 3380 SADB_EXT_LIFETIME_CURRENT); 3381 if (!m) 3382 goto fail; 3383 break; 3384 3385 case SADB_EXT_LIFETIME_HARD: 3386 if (!sav->lft_h) 3387 continue; 3388 m = key_setlifetime(sav->lft_h, 3389 SADB_EXT_LIFETIME_HARD); 3390 if (!m) 3391 goto fail; 3392 break; 3393 3394 case SADB_EXT_LIFETIME_SOFT: 3395 if (!sav->lft_s) 3396 continue; 3397 m = key_setlifetime(sav->lft_s, 3398 SADB_EXT_LIFETIME_SOFT); 3399 3400 if (!m) 3401 goto fail; 3402 break; 3403 3404 case SADB_EXT_ADDRESS_PROXY: 3405 case SADB_EXT_IDENTITY_SRC: 3406 case SADB_EXT_IDENTITY_DST: 3407 /* XXX: should we brought from SPD ? */ 3408 case SADB_EXT_SENSITIVITY: 3409 default: 3410 continue; 3411 } 3412 3413 if (!m) 3414 goto fail; 3415 if (tres) 3416 m_cat(m, tres); 3417 tres = m; 3418 3419 } 3420 3421 m_cat(result, tres); 3422 if (result->m_len < sizeof(struct sadb_msg)) { 3423 result = m_pullup(result, sizeof(struct sadb_msg)); 3424 if (result == NULL) 3425 goto fail; 3426 } 3427 3428 result->m_pkthdr.len = 0; 3429 for (m = result; m; m = m->m_next) 3430 result->m_pkthdr.len += m->m_len; 3431 3432 mtod(result, struct sadb_msg *)->sadb_msg_len = 3433 PFKEY_UNIT64(result->m_pkthdr.len); 3434 3435 return result; 3436 3437 fail: 3438 m_freem(result); 3439 m_freem(tres); 3440 return NULL; 3441 } 3442 3443 /* 3444 * set data into sadb_msg. 3445 */ 3446 static struct mbuf * 3447 key_setsadbmsg(type, tlen, satype, seq, pid, reserved) 3448 u_int8_t type, satype; 3449 u_int16_t tlen; 3450 u_int32_t seq; 3451 pid_t pid; 3452 u_int16_t reserved; 3453 { 3454 struct mbuf *m; 3455 struct sadb_msg *p; 3456 int len; 3457 3458 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3459 if (len > MCLBYTES) 3460 return NULL; 3461 MGETHDR(m, M_DONTWAIT, MT_DATA); 3462 if (m && len > MHLEN) { 3463 MCLGET(m, M_DONTWAIT); 3464 if ((m->m_flags & M_EXT) == 0) { 3465 m_freem(m); 3466 m = NULL; 3467 } 3468 } 3469 if (!m) 3470 return NULL; 3471 m->m_pkthdr.len = m->m_len = len; 3472 m->m_next = NULL; 3473 3474 p = mtod(m, struct sadb_msg *); 3475 3476 bzero(p, len); 3477 p->sadb_msg_version = PF_KEY_V2; 3478 p->sadb_msg_type = type; 3479 p->sadb_msg_errno = 0; 3480 p->sadb_msg_satype = satype; 3481 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3482 p->sadb_msg_reserved = reserved; 3483 p->sadb_msg_seq = seq; 3484 p->sadb_msg_pid = (u_int32_t)pid; 3485 3486 return m; 3487 } 3488 3489 /* 3490 * copy secasvar data into sadb_address. 3491 */ 3492 static struct mbuf * 3493 key_setsadbsa(sav) 3494 struct secasvar *sav; 3495 { 3496 struct mbuf *m; 3497 struct sadb_sa *p; 3498 int len; 3499 3500 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3501 m = key_alloc_mbuf(len); 3502 if (!m || m->m_next) { /*XXX*/ 3503 if (m) 3504 m_freem(m); 3505 return NULL; 3506 } 3507 3508 p = mtod(m, struct sadb_sa *); 3509 3510 bzero(p, len); 3511 p->sadb_sa_len = PFKEY_UNIT64(len); 3512 p->sadb_sa_exttype = SADB_EXT_SA; 3513 p->sadb_sa_spi = sav->spi; 3514 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3515 p->sadb_sa_state = sav->state; 3516 p->sadb_sa_auth = sav->alg_auth; 3517 p->sadb_sa_encrypt = sav->alg_enc; 3518 p->sadb_sa_flags = sav->flags; 3519 3520 return m; 3521 } 3522 3523 /* 3524 * set data into sadb_address. 3525 */ 3526 static struct mbuf * 3527 key_setsadbaddr(exttype, saddr, prefixlen, ul_proto) 3528 u_int16_t exttype; 3529 const struct sockaddr *saddr; 3530 u_int8_t prefixlen; 3531 u_int16_t ul_proto; 3532 { 3533 struct mbuf *m; 3534 struct sadb_address *p; 3535 size_t len; 3536 3537 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3538 PFKEY_ALIGN8(saddr->sa_len); 3539 m = key_alloc_mbuf(len); 3540 if (!m || m->m_next) { /*XXX*/ 3541 if (m) 3542 m_freem(m); 3543 return NULL; 3544 } 3545 3546 p = mtod(m, struct sadb_address *); 3547 3548 bzero(p, len); 3549 p->sadb_address_len = PFKEY_UNIT64(len); 3550 p->sadb_address_exttype = exttype; 3551 p->sadb_address_proto = ul_proto; 3552 if (prefixlen == FULLMASK) { 3553 switch (saddr->sa_family) { 3554 case AF_INET: 3555 prefixlen = sizeof(struct in_addr) << 3; 3556 break; 3557 case AF_INET6: 3558 prefixlen = sizeof(struct in6_addr) << 3; 3559 break; 3560 default: 3561 ; /*XXX*/ 3562 } 3563 } 3564 p->sadb_address_prefixlen = prefixlen; 3565 p->sadb_address_reserved = 0; 3566 3567 bcopy(saddr, 3568 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3569 saddr->sa_len); 3570 3571 return m; 3572 } 3573 3574 /* 3575 * set data into sadb_x_sa2. 3576 */ 3577 static struct mbuf * 3578 key_setsadbxsa2(mode, seq, reqid) 3579 u_int8_t mode; 3580 u_int32_t seq, reqid; 3581 { 3582 struct mbuf *m; 3583 struct sadb_x_sa2 *p; 3584 size_t len; 3585 3586 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3587 m = key_alloc_mbuf(len); 3588 if (!m || m->m_next) { /*XXX*/ 3589 if (m) 3590 m_freem(m); 3591 return NULL; 3592 } 3593 3594 p = mtod(m, struct sadb_x_sa2 *); 3595 3596 bzero(p, len); 3597 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3598 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3599 p->sadb_x_sa2_mode = mode; 3600 p->sadb_x_sa2_reserved1 = 0; 3601 p->sadb_x_sa2_reserved2 = 0; 3602 p->sadb_x_sa2_sequence = seq; 3603 p->sadb_x_sa2_reqid = reqid; 3604 3605 return m; 3606 } 3607 3608 /* 3609 * set data into sadb_x_policy 3610 */ 3611 static struct mbuf * 3612 key_setsadbxpolicy(type, dir, id) 3613 u_int16_t type; 3614 u_int8_t dir; 3615 u_int32_t id; 3616 { 3617 struct mbuf *m; 3618 struct sadb_x_policy *p; 3619 size_t len; 3620 3621 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3622 m = key_alloc_mbuf(len); 3623 if (!m || m->m_next) { /*XXX*/ 3624 if (m) 3625 m_freem(m); 3626 return NULL; 3627 } 3628 3629 p = mtod(m, struct sadb_x_policy *); 3630 3631 bzero(p, len); 3632 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3633 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3634 p->sadb_x_policy_type = type; 3635 p->sadb_x_policy_dir = dir; 3636 p->sadb_x_policy_id = id; 3637 3638 return m; 3639 } 3640 3641 /* %%% utilities */ 3642 /* Take a key message (sadb_key) from the socket and turn it into one 3643 * of the kernel's key structures (seckey). 3644 * 3645 * IN: pointer to the src 3646 * OUT: NULL no more memory 3647 */ 3648 struct seckey * 3649 key_dup_keymsg(const struct sadb_key *src, u_int len, 3650 struct malloc_type *type) 3651 { 3652 struct seckey *dst; 3653 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3654 if (dst != NULL) { 3655 dst->bits = src->sadb_key_bits; 3656 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3657 if (dst->key_data != NULL) { 3658 bcopy((const char *)src + sizeof(struct sadb_key), 3659 dst->key_data, len); 3660 } else { 3661 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3662 __func__)); 3663 free(dst, type); 3664 dst = NULL; 3665 } 3666 } else { 3667 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3668 __func__)); 3669 3670 } 3671 return dst; 3672 } 3673 3674 /* Take a lifetime message (sadb_lifetime) passed in on a socket and 3675 * turn it into one of the kernel's lifetime structures (seclifetime). 3676 * 3677 * IN: pointer to the destination, source and malloc type 3678 * OUT: NULL, no more memory 3679 */ 3680 3681 static struct seclifetime * 3682 key_dup_lifemsg(const struct sadb_lifetime *src, 3683 struct malloc_type *type) 3684 { 3685 struct seclifetime *dst = NULL; 3686 3687 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3688 type, M_NOWAIT); 3689 if (dst == NULL) { 3690 /* XXX counter */ 3691 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3692 } else { 3693 dst->allocations = src->sadb_lifetime_allocations; 3694 dst->bytes = src->sadb_lifetime_bytes; 3695 dst->addtime = src->sadb_lifetime_addtime; 3696 dst->usetime = src->sadb_lifetime_usetime; 3697 } 3698 return dst; 3699 } 3700 3701 /* compare my own address 3702 * OUT: 1: true, i.e. my address. 3703 * 0: false 3704 */ 3705 int 3706 key_ismyaddr(sa) 3707 struct sockaddr *sa; 3708 { 3709 #ifdef INET 3710 struct sockaddr_in *sin; 3711 struct in_ifaddr *ia; 3712 #endif 3713 3714 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3715 3716 switch (sa->sa_family) { 3717 #ifdef INET 3718 case AF_INET: 3719 sin = (struct sockaddr_in *)sa; 3720 for (ia = V_in_ifaddrhead.tqh_first; ia; 3721 ia = ia->ia_link.tqe_next) 3722 { 3723 if (sin->sin_family == ia->ia_addr.sin_family && 3724 sin->sin_len == ia->ia_addr.sin_len && 3725 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3726 { 3727 return 1; 3728 } 3729 } 3730 break; 3731 #endif 3732 #ifdef INET6 3733 case AF_INET6: 3734 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3735 #endif 3736 } 3737 3738 return 0; 3739 } 3740 3741 #ifdef INET6 3742 /* 3743 * compare my own address for IPv6. 3744 * 1: ours 3745 * 0: other 3746 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3747 */ 3748 #include <netinet6/in6_var.h> 3749 3750 static int 3751 key_ismyaddr6(sin6) 3752 struct sockaddr_in6 *sin6; 3753 { 3754 struct in6_ifaddr *ia; 3755 struct in6_multi *in6m; 3756 3757 for (ia = V_in6_ifaddr; ia; ia = ia->ia_next) { 3758 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3759 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3760 return 1; 3761 3762 /* 3763 * XXX Multicast 3764 * XXX why do we care about multlicast here while we don't care 3765 * about IPv4 multicast?? 3766 * XXX scope 3767 */ 3768 in6m = NULL; 3769 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3770 if (in6m) 3771 return 1; 3772 } 3773 3774 /* loopback, just for safety */ 3775 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3776 return 1; 3777 3778 return 0; 3779 } 3780 #endif /*INET6*/ 3781 3782 /* 3783 * compare two secasindex structure. 3784 * flag can specify to compare 2 saidxes. 3785 * compare two secasindex structure without both mode and reqid. 3786 * don't compare port. 3787 * IN: 3788 * saidx0: source, it can be in SAD. 3789 * saidx1: object. 3790 * OUT: 3791 * 1 : equal 3792 * 0 : not equal 3793 */ 3794 static int 3795 key_cmpsaidx( 3796 const struct secasindex *saidx0, 3797 const struct secasindex *saidx1, 3798 int flag) 3799 { 3800 /* sanity */ 3801 if (saidx0 == NULL && saidx1 == NULL) 3802 return 1; 3803 3804 if (saidx0 == NULL || saidx1 == NULL) 3805 return 0; 3806 3807 if (saidx0->proto != saidx1->proto) 3808 return 0; 3809 3810 if (flag == CMP_EXACTLY) { 3811 if (saidx0->mode != saidx1->mode) 3812 return 0; 3813 if (saidx0->reqid != saidx1->reqid) 3814 return 0; 3815 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3816 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3817 return 0; 3818 } else { 3819 3820 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3821 if (flag == CMP_MODE_REQID 3822 ||flag == CMP_REQID) { 3823 /* 3824 * If reqid of SPD is non-zero, unique SA is required. 3825 * The result must be of same reqid in this case. 3826 */ 3827 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3828 return 0; 3829 } 3830 3831 if (flag == CMP_MODE_REQID) { 3832 if (saidx0->mode != IPSEC_MODE_ANY 3833 && saidx0->mode != saidx1->mode) 3834 return 0; 3835 } 3836 3837 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3838 return 0; 3839 } 3840 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3841 return 0; 3842 } 3843 } 3844 3845 return 1; 3846 } 3847 3848 /* 3849 * compare two secindex structure exactly. 3850 * IN: 3851 * spidx0: source, it is often in SPD. 3852 * spidx1: object, it is often from PFKEY message. 3853 * OUT: 3854 * 1 : equal 3855 * 0 : not equal 3856 */ 3857 static int 3858 key_cmpspidx_exactly( 3859 struct secpolicyindex *spidx0, 3860 struct secpolicyindex *spidx1) 3861 { 3862 /* sanity */ 3863 if (spidx0 == NULL && spidx1 == NULL) 3864 return 1; 3865 3866 if (spidx0 == NULL || spidx1 == NULL) 3867 return 0; 3868 3869 if (spidx0->prefs != spidx1->prefs 3870 || spidx0->prefd != spidx1->prefd 3871 || spidx0->ul_proto != spidx1->ul_proto) 3872 return 0; 3873 3874 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3875 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3876 } 3877 3878 /* 3879 * compare two secindex structure with mask. 3880 * IN: 3881 * spidx0: source, it is often in SPD. 3882 * spidx1: object, it is often from IP header. 3883 * OUT: 3884 * 1 : equal 3885 * 0 : not equal 3886 */ 3887 static int 3888 key_cmpspidx_withmask( 3889 struct secpolicyindex *spidx0, 3890 struct secpolicyindex *spidx1) 3891 { 3892 /* sanity */ 3893 if (spidx0 == NULL && spidx1 == NULL) 3894 return 1; 3895 3896 if (spidx0 == NULL || spidx1 == NULL) 3897 return 0; 3898 3899 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3900 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3901 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3902 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3903 return 0; 3904 3905 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3906 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3907 && spidx0->ul_proto != spidx1->ul_proto) 3908 return 0; 3909 3910 switch (spidx0->src.sa.sa_family) { 3911 case AF_INET: 3912 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3913 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3914 return 0; 3915 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3916 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3917 return 0; 3918 break; 3919 case AF_INET6: 3920 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3921 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3922 return 0; 3923 /* 3924 * scope_id check. if sin6_scope_id is 0, we regard it 3925 * as a wildcard scope, which matches any scope zone ID. 3926 */ 3927 if (spidx0->src.sin6.sin6_scope_id && 3928 spidx1->src.sin6.sin6_scope_id && 3929 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3930 return 0; 3931 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3932 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3933 return 0; 3934 break; 3935 default: 3936 /* XXX */ 3937 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3938 return 0; 3939 break; 3940 } 3941 3942 switch (spidx0->dst.sa.sa_family) { 3943 case AF_INET: 3944 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3945 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3946 return 0; 3947 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3948 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3949 return 0; 3950 break; 3951 case AF_INET6: 3952 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3953 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3954 return 0; 3955 /* 3956 * scope_id check. if sin6_scope_id is 0, we regard it 3957 * as a wildcard scope, which matches any scope zone ID. 3958 */ 3959 if (spidx0->dst.sin6.sin6_scope_id && 3960 spidx1->dst.sin6.sin6_scope_id && 3961 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3962 return 0; 3963 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3964 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3965 return 0; 3966 break; 3967 default: 3968 /* XXX */ 3969 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3970 return 0; 3971 break; 3972 } 3973 3974 /* XXX Do we check other field ? e.g. flowinfo */ 3975 3976 return 1; 3977 } 3978 3979 /* returns 0 on match */ 3980 static int 3981 key_sockaddrcmp( 3982 const struct sockaddr *sa1, 3983 const struct sockaddr *sa2, 3984 int port) 3985 { 3986 #ifdef satosin 3987 #undef satosin 3988 #endif 3989 #define satosin(s) ((const struct sockaddr_in *)s) 3990 #ifdef satosin6 3991 #undef satosin6 3992 #endif 3993 #define satosin6(s) ((const struct sockaddr_in6 *)s) 3994 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 3995 return 1; 3996 3997 switch (sa1->sa_family) { 3998 case AF_INET: 3999 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4000 return 1; 4001 if (satosin(sa1)->sin_addr.s_addr != 4002 satosin(sa2)->sin_addr.s_addr) { 4003 return 1; 4004 } 4005 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4006 return 1; 4007 break; 4008 case AF_INET6: 4009 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4010 return 1; /*EINVAL*/ 4011 if (satosin6(sa1)->sin6_scope_id != 4012 satosin6(sa2)->sin6_scope_id) { 4013 return 1; 4014 } 4015 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4016 &satosin6(sa2)->sin6_addr)) { 4017 return 1; 4018 } 4019 if (port && 4020 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4021 return 1; 4022 } 4023 break; 4024 default: 4025 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4026 return 1; 4027 break; 4028 } 4029 4030 return 0; 4031 #undef satosin 4032 #undef satosin6 4033 } 4034 4035 /* 4036 * compare two buffers with mask. 4037 * IN: 4038 * addr1: source 4039 * addr2: object 4040 * bits: Number of bits to compare 4041 * OUT: 4042 * 1 : equal 4043 * 0 : not equal 4044 */ 4045 static int 4046 key_bbcmp(const void *a1, const void *a2, u_int bits) 4047 { 4048 const unsigned char *p1 = a1; 4049 const unsigned char *p2 = a2; 4050 4051 /* XXX: This could be considerably faster if we compare a word 4052 * at a time, but it is complicated on LSB Endian machines */ 4053 4054 /* Handle null pointers */ 4055 if (p1 == NULL || p2 == NULL) 4056 return (p1 == p2); 4057 4058 while (bits >= 8) { 4059 if (*p1++ != *p2++) 4060 return 0; 4061 bits -= 8; 4062 } 4063 4064 if (bits > 0) { 4065 u_int8_t mask = ~((1<<(8-bits))-1); 4066 if ((*p1 & mask) != (*p2 & mask)) 4067 return 0; 4068 } 4069 return 1; /* Match! */ 4070 } 4071 4072 static void 4073 key_flush_spd(time_t now) 4074 { 4075 static u_int16_t sptree_scangen = 0; 4076 u_int16_t gen = sptree_scangen++; 4077 struct secpolicy *sp; 4078 u_int dir; 4079 4080 /* SPD */ 4081 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4082 restart: 4083 SPTREE_LOCK(); 4084 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4085 if (sp->scangen == gen) /* previously handled */ 4086 continue; 4087 sp->scangen = gen; 4088 if (sp->state == IPSEC_SPSTATE_DEAD) { 4089 /* NB: clean entries created by key_spdflush */ 4090 SPTREE_UNLOCK(); 4091 KEY_FREESP(&sp); 4092 goto restart; 4093 } 4094 if (sp->lifetime == 0 && sp->validtime == 0) 4095 continue; 4096 if ((sp->lifetime && now - sp->created > sp->lifetime) 4097 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4098 sp->state = IPSEC_SPSTATE_DEAD; 4099 SPTREE_UNLOCK(); 4100 key_spdexpire(sp); 4101 KEY_FREESP(&sp); 4102 goto restart; 4103 } 4104 } 4105 SPTREE_UNLOCK(); 4106 } 4107 } 4108 4109 static void 4110 key_flush_sad(time_t now) 4111 { 4112 struct secashead *sah, *nextsah; 4113 struct secasvar *sav, *nextsav; 4114 4115 /* SAD */ 4116 SAHTREE_LOCK(); 4117 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4118 /* if sah has been dead, then delete it and process next sah. */ 4119 if (sah->state == SADB_SASTATE_DEAD) { 4120 key_delsah(sah); 4121 continue; 4122 } 4123 4124 /* if LARVAL entry doesn't become MATURE, delete it. */ 4125 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4126 if (now - sav->created > V_key_larval_lifetime) 4127 KEY_FREESAV(&sav); 4128 } 4129 4130 /* 4131 * check MATURE entry to start to send expire message 4132 * whether or not. 4133 */ 4134 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4135 /* we don't need to check. */ 4136 if (sav->lft_s == NULL) 4137 continue; 4138 4139 /* sanity check */ 4140 if (sav->lft_c == NULL) { 4141 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4142 "time, why?\n", __func__)); 4143 continue; 4144 } 4145 4146 /* check SOFT lifetime */ 4147 if (sav->lft_s->addtime != 0 && 4148 now - sav->created > sav->lft_s->addtime) { 4149 /* 4150 * check SA to be used whether or not. 4151 * when SA hasn't been used, delete it. 4152 */ 4153 if (sav->lft_c->usetime == 0) { 4154 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4155 KEY_FREESAV(&sav); 4156 } else { 4157 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4158 /* 4159 * XXX If we keep to send expire 4160 * message in the status of 4161 * DYING. Do remove below code. 4162 */ 4163 key_expire(sav); 4164 } 4165 } 4166 /* check SOFT lifetime by bytes */ 4167 /* 4168 * XXX I don't know the way to delete this SA 4169 * when new SA is installed. Caution when it's 4170 * installed too big lifetime by time. 4171 */ 4172 else if (sav->lft_s->bytes != 0 && 4173 sav->lft_s->bytes < sav->lft_c->bytes) { 4174 4175 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4176 /* 4177 * XXX If we keep to send expire 4178 * message in the status of 4179 * DYING. Do remove below code. 4180 */ 4181 key_expire(sav); 4182 } 4183 } 4184 4185 /* check DYING entry to change status to DEAD. */ 4186 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4187 /* we don't need to check. */ 4188 if (sav->lft_h == NULL) 4189 continue; 4190 4191 /* sanity check */ 4192 if (sav->lft_c == NULL) { 4193 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4194 "time, why?\n", __func__)); 4195 continue; 4196 } 4197 4198 if (sav->lft_h->addtime != 0 && 4199 now - sav->created > sav->lft_h->addtime) { 4200 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4201 KEY_FREESAV(&sav); 4202 } 4203 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4204 else if (sav->lft_s != NULL 4205 && sav->lft_s->addtime != 0 4206 && now - sav->created > sav->lft_s->addtime) { 4207 /* 4208 * XXX: should be checked to be 4209 * installed the valid SA. 4210 */ 4211 4212 /* 4213 * If there is no SA then sending 4214 * expire message. 4215 */ 4216 key_expire(sav); 4217 } 4218 #endif 4219 /* check HARD lifetime by bytes */ 4220 else if (sav->lft_h->bytes != 0 && 4221 sav->lft_h->bytes < sav->lft_c->bytes) { 4222 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4223 KEY_FREESAV(&sav); 4224 } 4225 } 4226 4227 /* delete entry in DEAD */ 4228 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4229 /* sanity check */ 4230 if (sav->state != SADB_SASTATE_DEAD) { 4231 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4232 "(queue: %d SA: %d): kill it anyway\n", 4233 __func__, 4234 SADB_SASTATE_DEAD, sav->state)); 4235 } 4236 /* 4237 * do not call key_freesav() here. 4238 * sav should already be freed, and sav->refcnt 4239 * shows other references to sav 4240 * (such as from SPD). 4241 */ 4242 } 4243 } 4244 SAHTREE_UNLOCK(); 4245 } 4246 4247 static void 4248 key_flush_acq(time_t now) 4249 { 4250 struct secacq *acq, *nextacq; 4251 4252 /* ACQ tree */ 4253 ACQ_LOCK(); 4254 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4255 nextacq = LIST_NEXT(acq, chain); 4256 if (now - acq->created > V_key_blockacq_lifetime 4257 && __LIST_CHAINED(acq)) { 4258 LIST_REMOVE(acq, chain); 4259 free(acq, M_IPSEC_SAQ); 4260 } 4261 } 4262 ACQ_UNLOCK(); 4263 } 4264 4265 static void 4266 key_flush_spacq(time_t now) 4267 { 4268 struct secspacq *acq, *nextacq; 4269 4270 /* SP ACQ tree */ 4271 SPACQ_LOCK(); 4272 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4273 nextacq = LIST_NEXT(acq, chain); 4274 if (now - acq->created > V_key_blockacq_lifetime 4275 && __LIST_CHAINED(acq)) { 4276 LIST_REMOVE(acq, chain); 4277 free(acq, M_IPSEC_SAQ); 4278 } 4279 } 4280 SPACQ_UNLOCK(); 4281 } 4282 4283 /* 4284 * time handler. 4285 * scanning SPD and SAD to check status for each entries, 4286 * and do to remove or to expire. 4287 * XXX: year 2038 problem may remain. 4288 */ 4289 void 4290 key_timehandler(void) 4291 { 4292 time_t now = time_second; 4293 4294 key_flush_spd(now); 4295 key_flush_sad(now); 4296 key_flush_acq(now); 4297 key_flush_spacq(now); 4298 4299 #ifndef IPSEC_DEBUG2 4300 /* do exchange to tick time !! */ 4301 (void)timeout((void *)key_timehandler, (void *)0, hz); 4302 #endif /* IPSEC_DEBUG2 */ 4303 } 4304 4305 u_long 4306 key_random() 4307 { 4308 u_long value; 4309 4310 key_randomfill(&value, sizeof(value)); 4311 return value; 4312 } 4313 4314 void 4315 key_randomfill(p, l) 4316 void *p; 4317 size_t l; 4318 { 4319 size_t n; 4320 u_long v; 4321 static int warn = 1; 4322 4323 n = 0; 4324 n = (size_t)read_random(p, (u_int)l); 4325 /* last resort */ 4326 while (n < l) { 4327 v = random(); 4328 bcopy(&v, (u_int8_t *)p + n, 4329 l - n < sizeof(v) ? l - n : sizeof(v)); 4330 n += sizeof(v); 4331 4332 if (warn) { 4333 printf("WARNING: pseudo-random number generator " 4334 "used for IPsec processing\n"); 4335 warn = 0; 4336 } 4337 } 4338 } 4339 4340 /* 4341 * map SADB_SATYPE_* to IPPROTO_*. 4342 * if satype == SADB_SATYPE then satype is mapped to ~0. 4343 * OUT: 4344 * 0: invalid satype. 4345 */ 4346 static u_int16_t 4347 key_satype2proto(satype) 4348 u_int8_t satype; 4349 { 4350 switch (satype) { 4351 case SADB_SATYPE_UNSPEC: 4352 return IPSEC_PROTO_ANY; 4353 case SADB_SATYPE_AH: 4354 return IPPROTO_AH; 4355 case SADB_SATYPE_ESP: 4356 return IPPROTO_ESP; 4357 case SADB_X_SATYPE_IPCOMP: 4358 return IPPROTO_IPCOMP; 4359 case SADB_X_SATYPE_TCPSIGNATURE: 4360 return IPPROTO_TCP; 4361 default: 4362 return 0; 4363 } 4364 /* NOTREACHED */ 4365 } 4366 4367 /* 4368 * map IPPROTO_* to SADB_SATYPE_* 4369 * OUT: 4370 * 0: invalid protocol type. 4371 */ 4372 static u_int8_t 4373 key_proto2satype(proto) 4374 u_int16_t proto; 4375 { 4376 switch (proto) { 4377 case IPPROTO_AH: 4378 return SADB_SATYPE_AH; 4379 case IPPROTO_ESP: 4380 return SADB_SATYPE_ESP; 4381 case IPPROTO_IPCOMP: 4382 return SADB_X_SATYPE_IPCOMP; 4383 case IPPROTO_TCP: 4384 return SADB_X_SATYPE_TCPSIGNATURE; 4385 default: 4386 return 0; 4387 } 4388 /* NOTREACHED */ 4389 } 4390 4391 /* %%% PF_KEY */ 4392 /* 4393 * SADB_GETSPI processing is to receive 4394 * <base, (SA2), src address, dst address, (SPI range)> 4395 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4396 * tree with the status of LARVAL, and send 4397 * <base, SA(*), address(SD)> 4398 * to the IKMPd. 4399 * 4400 * IN: mhp: pointer to the pointer to each header. 4401 * OUT: NULL if fail. 4402 * other if success, return pointer to the message to send. 4403 */ 4404 static int 4405 key_getspi(so, m, mhp) 4406 struct socket *so; 4407 struct mbuf *m; 4408 const struct sadb_msghdr *mhp; 4409 { 4410 struct sadb_address *src0, *dst0; 4411 struct secasindex saidx; 4412 struct secashead *newsah; 4413 struct secasvar *newsav; 4414 u_int8_t proto; 4415 u_int32_t spi; 4416 u_int8_t mode; 4417 u_int32_t reqid; 4418 int error; 4419 4420 IPSEC_ASSERT(so != NULL, ("null socket")); 4421 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4422 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4423 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4424 4425 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4426 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4427 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4428 __func__)); 4429 return key_senderror(so, m, EINVAL); 4430 } 4431 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4432 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4433 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4434 __func__)); 4435 return key_senderror(so, m, EINVAL); 4436 } 4437 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4438 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4439 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4440 } else { 4441 mode = IPSEC_MODE_ANY; 4442 reqid = 0; 4443 } 4444 4445 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4446 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4447 4448 /* map satype to proto */ 4449 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4450 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4451 __func__)); 4452 return key_senderror(so, m, EINVAL); 4453 } 4454 4455 /* make sure if port number is zero. */ 4456 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4457 case AF_INET: 4458 if (((struct sockaddr *)(src0 + 1))->sa_len != 4459 sizeof(struct sockaddr_in)) 4460 return key_senderror(so, m, EINVAL); 4461 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4462 break; 4463 case AF_INET6: 4464 if (((struct sockaddr *)(src0 + 1))->sa_len != 4465 sizeof(struct sockaddr_in6)) 4466 return key_senderror(so, m, EINVAL); 4467 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4468 break; 4469 default: 4470 ; /*???*/ 4471 } 4472 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4473 case AF_INET: 4474 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4475 sizeof(struct sockaddr_in)) 4476 return key_senderror(so, m, EINVAL); 4477 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4478 break; 4479 case AF_INET6: 4480 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4481 sizeof(struct sockaddr_in6)) 4482 return key_senderror(so, m, EINVAL); 4483 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4484 break; 4485 default: 4486 ; /*???*/ 4487 } 4488 4489 /* XXX boundary check against sa_len */ 4490 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4491 4492 /* SPI allocation */ 4493 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4494 &saidx); 4495 if (spi == 0) 4496 return key_senderror(so, m, EINVAL); 4497 4498 /* get a SA index */ 4499 if ((newsah = key_getsah(&saidx)) == NULL) { 4500 /* create a new SA index */ 4501 if ((newsah = key_newsah(&saidx)) == NULL) { 4502 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4503 return key_senderror(so, m, ENOBUFS); 4504 } 4505 } 4506 4507 /* get a new SA */ 4508 /* XXX rewrite */ 4509 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4510 if (newsav == NULL) { 4511 /* XXX don't free new SA index allocated in above. */ 4512 return key_senderror(so, m, error); 4513 } 4514 4515 /* set spi */ 4516 newsav->spi = htonl(spi); 4517 4518 /* delete the entry in acqtree */ 4519 if (mhp->msg->sadb_msg_seq != 0) { 4520 struct secacq *acq; 4521 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4522 /* reset counter in order to deletion by timehandler. */ 4523 acq->created = time_second; 4524 acq->count = 0; 4525 } 4526 } 4527 4528 { 4529 struct mbuf *n, *nn; 4530 struct sadb_sa *m_sa; 4531 struct sadb_msg *newmsg; 4532 int off, len; 4533 4534 /* create new sadb_msg to reply. */ 4535 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4536 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4537 4538 MGETHDR(n, M_DONTWAIT, MT_DATA); 4539 if (len > MHLEN) { 4540 MCLGET(n, M_DONTWAIT); 4541 if ((n->m_flags & M_EXT) == 0) { 4542 m_freem(n); 4543 n = NULL; 4544 } 4545 } 4546 if (!n) 4547 return key_senderror(so, m, ENOBUFS); 4548 4549 n->m_len = len; 4550 n->m_next = NULL; 4551 off = 0; 4552 4553 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4554 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4555 4556 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4557 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4558 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4559 m_sa->sadb_sa_spi = htonl(spi); 4560 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4561 4562 IPSEC_ASSERT(off == len, 4563 ("length inconsistency (off %u len %u)", off, len)); 4564 4565 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4566 SADB_EXT_ADDRESS_DST); 4567 if (!n->m_next) { 4568 m_freem(n); 4569 return key_senderror(so, m, ENOBUFS); 4570 } 4571 4572 if (n->m_len < sizeof(struct sadb_msg)) { 4573 n = m_pullup(n, sizeof(struct sadb_msg)); 4574 if (n == NULL) 4575 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4576 } 4577 4578 n->m_pkthdr.len = 0; 4579 for (nn = n; nn; nn = nn->m_next) 4580 n->m_pkthdr.len += nn->m_len; 4581 4582 newmsg = mtod(n, struct sadb_msg *); 4583 newmsg->sadb_msg_seq = newsav->seq; 4584 newmsg->sadb_msg_errno = 0; 4585 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4586 4587 m_freem(m); 4588 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4589 } 4590 } 4591 4592 /* 4593 * allocating new SPI 4594 * called by key_getspi(). 4595 * OUT: 4596 * 0: failure. 4597 * others: success. 4598 */ 4599 static u_int32_t 4600 key_do_getnewspi(spirange, saidx) 4601 struct sadb_spirange *spirange; 4602 struct secasindex *saidx; 4603 { 4604 u_int32_t newspi; 4605 u_int32_t min, max; 4606 int count = V_key_spi_trycnt; 4607 4608 /* set spi range to allocate */ 4609 if (spirange != NULL) { 4610 min = spirange->sadb_spirange_min; 4611 max = spirange->sadb_spirange_max; 4612 } else { 4613 min = V_key_spi_minval; 4614 max = V_key_spi_maxval; 4615 } 4616 /* IPCOMP needs 2-byte SPI */ 4617 if (saidx->proto == IPPROTO_IPCOMP) { 4618 u_int32_t t; 4619 if (min >= 0x10000) 4620 min = 0xffff; 4621 if (max >= 0x10000) 4622 max = 0xffff; 4623 if (min > max) { 4624 t = min; min = max; max = t; 4625 } 4626 } 4627 4628 if (min == max) { 4629 if (key_checkspidup(saidx, min) != NULL) { 4630 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4631 __func__, min)); 4632 return 0; 4633 } 4634 4635 count--; /* taking one cost. */ 4636 newspi = min; 4637 4638 } else { 4639 4640 /* init SPI */ 4641 newspi = 0; 4642 4643 /* when requesting to allocate spi ranged */ 4644 while (count--) { 4645 /* generate pseudo-random SPI value ranged. */ 4646 newspi = min + (key_random() % (max - min + 1)); 4647 4648 if (key_checkspidup(saidx, newspi) == NULL) 4649 break; 4650 } 4651 4652 if (count == 0 || newspi == 0) { 4653 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4654 __func__)); 4655 return 0; 4656 } 4657 } 4658 4659 /* statistics */ 4660 keystat.getspi_count = 4661 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4662 4663 return newspi; 4664 } 4665 4666 /* 4667 * SADB_UPDATE processing 4668 * receive 4669 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4670 * key(AE), (identity(SD),) (sensitivity)> 4671 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4672 * and send 4673 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4674 * (identity(SD),) (sensitivity)> 4675 * to the ikmpd. 4676 * 4677 * m will always be freed. 4678 */ 4679 static int 4680 key_update(so, m, mhp) 4681 struct socket *so; 4682 struct mbuf *m; 4683 const struct sadb_msghdr *mhp; 4684 { 4685 struct sadb_sa *sa0; 4686 struct sadb_address *src0, *dst0; 4687 struct secasindex saidx; 4688 struct secashead *sah; 4689 struct secasvar *sav; 4690 u_int16_t proto; 4691 u_int8_t mode; 4692 u_int32_t reqid; 4693 int error; 4694 4695 IPSEC_ASSERT(so != NULL, ("null socket")); 4696 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4697 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4698 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4699 4700 /* map satype to proto */ 4701 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4702 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4703 __func__)); 4704 return key_senderror(so, m, EINVAL); 4705 } 4706 4707 if (mhp->ext[SADB_EXT_SA] == NULL || 4708 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4709 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4710 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4711 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4712 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4713 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4714 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4715 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4716 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4717 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4718 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4719 __func__)); 4720 return key_senderror(so, m, EINVAL); 4721 } 4722 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4723 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4724 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4725 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4726 __func__)); 4727 return key_senderror(so, m, EINVAL); 4728 } 4729 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4730 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4731 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4732 } else { 4733 mode = IPSEC_MODE_ANY; 4734 reqid = 0; 4735 } 4736 /* XXX boundary checking for other extensions */ 4737 4738 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4739 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4740 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4741 4742 /* XXX boundary check against sa_len */ 4743 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4744 4745 /* get a SA header */ 4746 if ((sah = key_getsah(&saidx)) == NULL) { 4747 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4748 return key_senderror(so, m, ENOENT); 4749 } 4750 4751 /* set spidx if there */ 4752 /* XXX rewrite */ 4753 error = key_setident(sah, m, mhp); 4754 if (error) 4755 return key_senderror(so, m, error); 4756 4757 /* find a SA with sequence number. */ 4758 #ifdef IPSEC_DOSEQCHECK 4759 if (mhp->msg->sadb_msg_seq != 0 4760 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4761 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4762 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4763 return key_senderror(so, m, ENOENT); 4764 } 4765 #else 4766 SAHTREE_LOCK(); 4767 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4768 SAHTREE_UNLOCK(); 4769 if (sav == NULL) { 4770 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4771 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4772 return key_senderror(so, m, EINVAL); 4773 } 4774 #endif 4775 4776 /* validity check */ 4777 if (sav->sah->saidx.proto != proto) { 4778 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4779 "(DB=%u param=%u)\n", __func__, 4780 sav->sah->saidx.proto, proto)); 4781 return key_senderror(so, m, EINVAL); 4782 } 4783 #ifdef IPSEC_DOSEQCHECK 4784 if (sav->spi != sa0->sadb_sa_spi) { 4785 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4786 __func__, 4787 (u_int32_t)ntohl(sav->spi), 4788 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4789 return key_senderror(so, m, EINVAL); 4790 } 4791 #endif 4792 if (sav->pid != mhp->msg->sadb_msg_pid) { 4793 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 4794 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 4795 return key_senderror(so, m, EINVAL); 4796 } 4797 4798 /* copy sav values */ 4799 error = key_setsaval(sav, m, mhp); 4800 if (error) { 4801 KEY_FREESAV(&sav); 4802 return key_senderror(so, m, error); 4803 } 4804 4805 /* check SA values to be mature. */ 4806 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4807 KEY_FREESAV(&sav); 4808 return key_senderror(so, m, 0); 4809 } 4810 4811 { 4812 struct mbuf *n; 4813 4814 /* set msg buf from mhp */ 4815 n = key_getmsgbuf_x1(m, mhp); 4816 if (n == NULL) { 4817 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4818 return key_senderror(so, m, ENOBUFS); 4819 } 4820 4821 m_freem(m); 4822 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4823 } 4824 } 4825 4826 /* 4827 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4828 * only called by key_update(). 4829 * OUT: 4830 * NULL : not found 4831 * others : found, pointer to a SA. 4832 */ 4833 #ifdef IPSEC_DOSEQCHECK 4834 static struct secasvar * 4835 key_getsavbyseq(sah, seq) 4836 struct secashead *sah; 4837 u_int32_t seq; 4838 { 4839 struct secasvar *sav; 4840 u_int state; 4841 4842 state = SADB_SASTATE_LARVAL; 4843 4844 /* search SAD with sequence number ? */ 4845 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4846 4847 KEY_CHKSASTATE(state, sav->state, __func__); 4848 4849 if (sav->seq == seq) { 4850 sa_addref(sav); 4851 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4852 printf("DP %s cause refcnt++:%d SA:%p\n", 4853 __func__, sav->refcnt, sav)); 4854 return sav; 4855 } 4856 } 4857 4858 return NULL; 4859 } 4860 #endif 4861 4862 /* 4863 * SADB_ADD processing 4864 * add an entry to SA database, when received 4865 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4866 * key(AE), (identity(SD),) (sensitivity)> 4867 * from the ikmpd, 4868 * and send 4869 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4870 * (identity(SD),) (sensitivity)> 4871 * to the ikmpd. 4872 * 4873 * IGNORE identity and sensitivity messages. 4874 * 4875 * m will always be freed. 4876 */ 4877 static int 4878 key_add(so, m, mhp) 4879 struct socket *so; 4880 struct mbuf *m; 4881 const struct sadb_msghdr *mhp; 4882 { 4883 struct sadb_sa *sa0; 4884 struct sadb_address *src0, *dst0; 4885 struct secasindex saidx; 4886 struct secashead *newsah; 4887 struct secasvar *newsav; 4888 u_int16_t proto; 4889 u_int8_t mode; 4890 u_int32_t reqid; 4891 int error; 4892 4893 IPSEC_ASSERT(so != NULL, ("null socket")); 4894 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4895 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4896 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4897 4898 /* map satype to proto */ 4899 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4900 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4901 __func__)); 4902 return key_senderror(so, m, EINVAL); 4903 } 4904 4905 if (mhp->ext[SADB_EXT_SA] == NULL || 4906 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4907 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4908 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4909 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4910 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4911 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4912 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4913 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4914 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4915 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4916 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4917 __func__)); 4918 return key_senderror(so, m, EINVAL); 4919 } 4920 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4921 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4922 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4923 /* XXX need more */ 4924 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4925 __func__)); 4926 return key_senderror(so, m, EINVAL); 4927 } 4928 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4929 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4930 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4931 } else { 4932 mode = IPSEC_MODE_ANY; 4933 reqid = 0; 4934 } 4935 4936 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4937 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4938 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4939 4940 /* XXX boundary check against sa_len */ 4941 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4942 4943 /* get a SA header */ 4944 if ((newsah = key_getsah(&saidx)) == NULL) { 4945 /* create a new SA header */ 4946 if ((newsah = key_newsah(&saidx)) == NULL) { 4947 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4948 return key_senderror(so, m, ENOBUFS); 4949 } 4950 } 4951 4952 /* set spidx if there */ 4953 /* XXX rewrite */ 4954 error = key_setident(newsah, m, mhp); 4955 if (error) { 4956 return key_senderror(so, m, error); 4957 } 4958 4959 /* create new SA entry. */ 4960 /* We can create new SA only if SPI is differenct. */ 4961 SAHTREE_LOCK(); 4962 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 4963 SAHTREE_UNLOCK(); 4964 if (newsav != NULL) { 4965 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 4966 return key_senderror(so, m, EEXIST); 4967 } 4968 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4969 if (newsav == NULL) { 4970 return key_senderror(so, m, error); 4971 } 4972 4973 /* check SA values to be mature. */ 4974 if ((error = key_mature(newsav)) != 0) { 4975 KEY_FREESAV(&newsav); 4976 return key_senderror(so, m, error); 4977 } 4978 4979 /* 4980 * don't call key_freesav() here, as we would like to keep the SA 4981 * in the database on success. 4982 */ 4983 4984 { 4985 struct mbuf *n; 4986 4987 /* set msg buf from mhp */ 4988 n = key_getmsgbuf_x1(m, mhp); 4989 if (n == NULL) { 4990 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4991 return key_senderror(so, m, ENOBUFS); 4992 } 4993 4994 m_freem(m); 4995 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4996 } 4997 } 4998 4999 /* m is retained */ 5000 static int 5001 key_setident(sah, m, mhp) 5002 struct secashead *sah; 5003 struct mbuf *m; 5004 const struct sadb_msghdr *mhp; 5005 { 5006 const struct sadb_ident *idsrc, *iddst; 5007 int idsrclen, iddstlen; 5008 5009 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5010 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5011 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5012 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5013 5014 /* don't make buffer if not there */ 5015 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5016 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5017 sah->idents = NULL; 5018 sah->identd = NULL; 5019 return 0; 5020 } 5021 5022 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5023 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5024 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5025 return EINVAL; 5026 } 5027 5028 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5029 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5030 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5031 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5032 5033 /* validity check */ 5034 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5035 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5036 return EINVAL; 5037 } 5038 5039 switch (idsrc->sadb_ident_type) { 5040 case SADB_IDENTTYPE_PREFIX: 5041 case SADB_IDENTTYPE_FQDN: 5042 case SADB_IDENTTYPE_USERFQDN: 5043 default: 5044 /* XXX do nothing */ 5045 sah->idents = NULL; 5046 sah->identd = NULL; 5047 return 0; 5048 } 5049 5050 /* make structure */ 5051 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5052 if (sah->idents == NULL) { 5053 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5054 return ENOBUFS; 5055 } 5056 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5057 if (sah->identd == NULL) { 5058 free(sah->idents, M_IPSEC_MISC); 5059 sah->idents = NULL; 5060 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5061 return ENOBUFS; 5062 } 5063 sah->idents->type = idsrc->sadb_ident_type; 5064 sah->idents->id = idsrc->sadb_ident_id; 5065 5066 sah->identd->type = iddst->sadb_ident_type; 5067 sah->identd->id = iddst->sadb_ident_id; 5068 5069 return 0; 5070 } 5071 5072 /* 5073 * m will not be freed on return. 5074 * it is caller's responsibility to free the result. 5075 */ 5076 static struct mbuf * 5077 key_getmsgbuf_x1(m, mhp) 5078 struct mbuf *m; 5079 const struct sadb_msghdr *mhp; 5080 { 5081 struct mbuf *n; 5082 5083 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5084 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5085 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5086 5087 /* create new sadb_msg to reply. */ 5088 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5089 SADB_EXT_SA, SADB_X_EXT_SA2, 5090 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5091 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5092 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5093 if (!n) 5094 return NULL; 5095 5096 if (n->m_len < sizeof(struct sadb_msg)) { 5097 n = m_pullup(n, sizeof(struct sadb_msg)); 5098 if (n == NULL) 5099 return NULL; 5100 } 5101 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5102 mtod(n, struct sadb_msg *)->sadb_msg_len = 5103 PFKEY_UNIT64(n->m_pkthdr.len); 5104 5105 return n; 5106 } 5107 5108 static int key_delete_all __P((struct socket *, struct mbuf *, 5109 const struct sadb_msghdr *, u_int16_t)); 5110 5111 /* 5112 * SADB_DELETE processing 5113 * receive 5114 * <base, SA(*), address(SD)> 5115 * from the ikmpd, and set SADB_SASTATE_DEAD, 5116 * and send, 5117 * <base, SA(*), address(SD)> 5118 * to the ikmpd. 5119 * 5120 * m will always be freed. 5121 */ 5122 static int 5123 key_delete(so, m, mhp) 5124 struct socket *so; 5125 struct mbuf *m; 5126 const struct sadb_msghdr *mhp; 5127 { 5128 struct sadb_sa *sa0; 5129 struct sadb_address *src0, *dst0; 5130 struct secasindex saidx; 5131 struct secashead *sah; 5132 struct secasvar *sav = NULL; 5133 u_int16_t proto; 5134 5135 IPSEC_ASSERT(so != NULL, ("null socket")); 5136 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5137 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5138 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5139 5140 /* map satype to proto */ 5141 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5142 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5143 __func__)); 5144 return key_senderror(so, m, EINVAL); 5145 } 5146 5147 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5148 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5149 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5150 __func__)); 5151 return key_senderror(so, m, EINVAL); 5152 } 5153 5154 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5155 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5156 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5157 __func__)); 5158 return key_senderror(so, m, EINVAL); 5159 } 5160 5161 if (mhp->ext[SADB_EXT_SA] == NULL) { 5162 /* 5163 * Caller wants us to delete all non-LARVAL SAs 5164 * that match the src/dst. This is used during 5165 * IKE INITIAL-CONTACT. 5166 */ 5167 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5168 return key_delete_all(so, m, mhp, proto); 5169 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5170 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5171 __func__)); 5172 return key_senderror(so, m, EINVAL); 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, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5181 5182 /* get a SA header */ 5183 SAHTREE_LOCK(); 5184 LIST_FOREACH(sah, &V_sahtree, chain) { 5185 if (sah->state == SADB_SASTATE_DEAD) 5186 continue; 5187 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5188 continue; 5189 5190 /* get a SA with SPI. */ 5191 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5192 if (sav) 5193 break; 5194 } 5195 if (sah == NULL) { 5196 SAHTREE_UNLOCK(); 5197 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5198 return key_senderror(so, m, ENOENT); 5199 } 5200 5201 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5202 SAHTREE_UNLOCK(); 5203 KEY_FREESAV(&sav); 5204 5205 { 5206 struct mbuf *n; 5207 struct sadb_msg *newmsg; 5208 5209 /* create new sadb_msg to reply. */ 5210 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5211 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5212 if (!n) 5213 return key_senderror(so, m, ENOBUFS); 5214 5215 if (n->m_len < sizeof(struct sadb_msg)) { 5216 n = m_pullup(n, sizeof(struct sadb_msg)); 5217 if (n == NULL) 5218 return key_senderror(so, m, ENOBUFS); 5219 } 5220 newmsg = mtod(n, struct sadb_msg *); 5221 newmsg->sadb_msg_errno = 0; 5222 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5223 5224 m_freem(m); 5225 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5226 } 5227 } 5228 5229 /* 5230 * delete all SAs for src/dst. Called from key_delete(). 5231 */ 5232 static int 5233 key_delete_all(so, m, mhp, proto) 5234 struct socket *so; 5235 struct mbuf *m; 5236 const struct sadb_msghdr *mhp; 5237 u_int16_t proto; 5238 { 5239 struct sadb_address *src0, *dst0; 5240 struct secasindex saidx; 5241 struct secashead *sah; 5242 struct secasvar *sav, *nextsav; 5243 u_int stateidx, state; 5244 5245 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5246 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5247 5248 /* XXX boundary check against sa_len */ 5249 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5250 5251 SAHTREE_LOCK(); 5252 LIST_FOREACH(sah, &V_sahtree, chain) { 5253 if (sah->state == SADB_SASTATE_DEAD) 5254 continue; 5255 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5256 continue; 5257 5258 /* Delete all non-LARVAL SAs. */ 5259 for (stateidx = 0; 5260 stateidx < _ARRAYLEN(V_saorder_state_alive); 5261 stateidx++) { 5262 state = V_saorder_state_alive[stateidx]; 5263 if (state == SADB_SASTATE_LARVAL) 5264 continue; 5265 for (sav = LIST_FIRST(&sah->savtree[state]); 5266 sav != NULL; sav = nextsav) { 5267 nextsav = LIST_NEXT(sav, chain); 5268 /* sanity check */ 5269 if (sav->state != state) { 5270 ipseclog((LOG_DEBUG, "%s: invalid " 5271 "sav->state (queue %d SA %d)\n", 5272 __func__, state, sav->state)); 5273 continue; 5274 } 5275 5276 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5277 KEY_FREESAV(&sav); 5278 } 5279 } 5280 } 5281 SAHTREE_UNLOCK(); 5282 { 5283 struct mbuf *n; 5284 struct sadb_msg *newmsg; 5285 5286 /* create new sadb_msg to reply. */ 5287 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5288 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5289 if (!n) 5290 return key_senderror(so, m, ENOBUFS); 5291 5292 if (n->m_len < sizeof(struct sadb_msg)) { 5293 n = m_pullup(n, sizeof(struct sadb_msg)); 5294 if (n == NULL) 5295 return key_senderror(so, m, ENOBUFS); 5296 } 5297 newmsg = mtod(n, struct sadb_msg *); 5298 newmsg->sadb_msg_errno = 0; 5299 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5300 5301 m_freem(m); 5302 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5303 } 5304 } 5305 5306 /* 5307 * SADB_GET processing 5308 * receive 5309 * <base, SA(*), address(SD)> 5310 * from the ikmpd, and get a SP and a SA to respond, 5311 * and send, 5312 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5313 * (identity(SD),) (sensitivity)> 5314 * to the ikmpd. 5315 * 5316 * m will always be freed. 5317 */ 5318 static int 5319 key_get(so, m, mhp) 5320 struct socket *so; 5321 struct mbuf *m; 5322 const struct sadb_msghdr *mhp; 5323 { 5324 struct sadb_sa *sa0; 5325 struct sadb_address *src0, *dst0; 5326 struct secasindex saidx; 5327 struct secashead *sah; 5328 struct secasvar *sav = NULL; 5329 u_int16_t proto; 5330 5331 IPSEC_ASSERT(so != NULL, ("null socket")); 5332 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5333 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5334 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5335 5336 /* map satype to proto */ 5337 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5338 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5339 __func__)); 5340 return key_senderror(so, m, EINVAL); 5341 } 5342 5343 if (mhp->ext[SADB_EXT_SA] == NULL || 5344 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5345 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5346 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5347 __func__)); 5348 return key_senderror(so, m, EINVAL); 5349 } 5350 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5351 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5352 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5353 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5354 __func__)); 5355 return key_senderror(so, m, EINVAL); 5356 } 5357 5358 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5359 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5360 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5361 5362 /* XXX boundary check against sa_len */ 5363 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5364 5365 /* get a SA header */ 5366 SAHTREE_LOCK(); 5367 LIST_FOREACH(sah, &V_sahtree, chain) { 5368 if (sah->state == SADB_SASTATE_DEAD) 5369 continue; 5370 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5371 continue; 5372 5373 /* get a SA with SPI. */ 5374 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5375 if (sav) 5376 break; 5377 } 5378 SAHTREE_UNLOCK(); 5379 if (sah == NULL) { 5380 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5381 return key_senderror(so, m, ENOENT); 5382 } 5383 5384 { 5385 struct mbuf *n; 5386 u_int8_t satype; 5387 5388 /* map proto to satype */ 5389 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5390 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5391 __func__)); 5392 return key_senderror(so, m, EINVAL); 5393 } 5394 5395 /* create new sadb_msg to reply. */ 5396 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5397 mhp->msg->sadb_msg_pid); 5398 if (!n) 5399 return key_senderror(so, m, ENOBUFS); 5400 5401 m_freem(m); 5402 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5403 } 5404 } 5405 5406 /* XXX make it sysctl-configurable? */ 5407 static void 5408 key_getcomb_setlifetime(comb) 5409 struct sadb_comb *comb; 5410 { 5411 5412 comb->sadb_comb_soft_allocations = 1; 5413 comb->sadb_comb_hard_allocations = 1; 5414 comb->sadb_comb_soft_bytes = 0; 5415 comb->sadb_comb_hard_bytes = 0; 5416 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5417 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5418 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5419 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5420 } 5421 5422 /* 5423 * XXX reorder combinations by preference 5424 * XXX no idea if the user wants ESP authentication or not 5425 */ 5426 static struct mbuf * 5427 key_getcomb_esp() 5428 { 5429 struct sadb_comb *comb; 5430 struct enc_xform *algo; 5431 struct mbuf *result = NULL, *m, *n; 5432 int encmin; 5433 int i, off, o; 5434 int totlen; 5435 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5436 5437 m = NULL; 5438 for (i = 1; i <= SADB_EALG_MAX; i++) { 5439 algo = esp_algorithm_lookup(i); 5440 if (algo == NULL) 5441 continue; 5442 5443 /* discard algorithms with key size smaller than system min */ 5444 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5445 continue; 5446 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5447 encmin = V_ipsec_esp_keymin; 5448 else 5449 encmin = _BITS(algo->minkey); 5450 5451 if (V_ipsec_esp_auth) 5452 m = key_getcomb_ah(); 5453 else { 5454 IPSEC_ASSERT(l <= MLEN, 5455 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5456 MGET(m, M_DONTWAIT, MT_DATA); 5457 if (m) { 5458 M_ALIGN(m, l); 5459 m->m_len = l; 5460 m->m_next = NULL; 5461 bzero(mtod(m, caddr_t), m->m_len); 5462 } 5463 } 5464 if (!m) 5465 goto fail; 5466 5467 totlen = 0; 5468 for (n = m; n; n = n->m_next) 5469 totlen += n->m_len; 5470 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5471 5472 for (off = 0; off < totlen; off += l) { 5473 n = m_pulldown(m, off, l, &o); 5474 if (!n) { 5475 /* m is already freed */ 5476 goto fail; 5477 } 5478 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5479 bzero(comb, sizeof(*comb)); 5480 key_getcomb_setlifetime(comb); 5481 comb->sadb_comb_encrypt = i; 5482 comb->sadb_comb_encrypt_minbits = encmin; 5483 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5484 } 5485 5486 if (!result) 5487 result = m; 5488 else 5489 m_cat(result, m); 5490 } 5491 5492 return result; 5493 5494 fail: 5495 if (result) 5496 m_freem(result); 5497 return NULL; 5498 } 5499 5500 static void 5501 key_getsizes_ah( 5502 const struct auth_hash *ah, 5503 int alg, 5504 u_int16_t* min, 5505 u_int16_t* max) 5506 { 5507 *min = *max = ah->keysize; 5508 if (ah->keysize == 0) { 5509 /* 5510 * Transform takes arbitrary key size but algorithm 5511 * key size is restricted. Enforce this here. 5512 */ 5513 switch (alg) { 5514 case SADB_X_AALG_MD5: *min = *max = 16; break; 5515 case SADB_X_AALG_SHA: *min = *max = 20; break; 5516 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5517 default: 5518 DPRINTF(("%s: unknown AH algorithm %u\n", 5519 __func__, alg)); 5520 break; 5521 } 5522 } 5523 } 5524 5525 /* 5526 * XXX reorder combinations by preference 5527 */ 5528 static struct mbuf * 5529 key_getcomb_ah() 5530 { 5531 struct sadb_comb *comb; 5532 struct auth_hash *algo; 5533 struct mbuf *m; 5534 u_int16_t minkeysize, maxkeysize; 5535 int i; 5536 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5537 5538 m = NULL; 5539 for (i = 1; i <= SADB_AALG_MAX; i++) { 5540 #if 1 5541 /* we prefer HMAC algorithms, not old algorithms */ 5542 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5543 continue; 5544 #endif 5545 algo = ah_algorithm_lookup(i); 5546 if (!algo) 5547 continue; 5548 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5549 /* discard algorithms with key size smaller than system min */ 5550 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 5551 continue; 5552 5553 if (!m) { 5554 IPSEC_ASSERT(l <= MLEN, 5555 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5556 MGET(m, M_DONTWAIT, MT_DATA); 5557 if (m) { 5558 M_ALIGN(m, l); 5559 m->m_len = l; 5560 m->m_next = NULL; 5561 } 5562 } else 5563 M_PREPEND(m, l, M_DONTWAIT); 5564 if (!m) 5565 return NULL; 5566 5567 comb = mtod(m, struct sadb_comb *); 5568 bzero(comb, sizeof(*comb)); 5569 key_getcomb_setlifetime(comb); 5570 comb->sadb_comb_auth = i; 5571 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5572 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5573 } 5574 5575 return m; 5576 } 5577 5578 /* 5579 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5580 * XXX reorder combinations by preference 5581 */ 5582 static struct mbuf * 5583 key_getcomb_ipcomp() 5584 { 5585 struct sadb_comb *comb; 5586 struct comp_algo *algo; 5587 struct mbuf *m; 5588 int i; 5589 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5590 5591 m = NULL; 5592 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5593 algo = ipcomp_algorithm_lookup(i); 5594 if (!algo) 5595 continue; 5596 5597 if (!m) { 5598 IPSEC_ASSERT(l <= MLEN, 5599 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5600 MGET(m, M_DONTWAIT, MT_DATA); 5601 if (m) { 5602 M_ALIGN(m, l); 5603 m->m_len = l; 5604 m->m_next = NULL; 5605 } 5606 } else 5607 M_PREPEND(m, l, M_DONTWAIT); 5608 if (!m) 5609 return NULL; 5610 5611 comb = mtod(m, struct sadb_comb *); 5612 bzero(comb, sizeof(*comb)); 5613 key_getcomb_setlifetime(comb); 5614 comb->sadb_comb_encrypt = i; 5615 /* what should we set into sadb_comb_*_{min,max}bits? */ 5616 } 5617 5618 return m; 5619 } 5620 5621 /* 5622 * XXX no way to pass mode (transport/tunnel) to userland 5623 * XXX replay checking? 5624 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5625 */ 5626 static struct mbuf * 5627 key_getprop(saidx) 5628 const struct secasindex *saidx; 5629 { 5630 struct sadb_prop *prop; 5631 struct mbuf *m, *n; 5632 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5633 int totlen; 5634 5635 switch (saidx->proto) { 5636 case IPPROTO_ESP: 5637 m = key_getcomb_esp(); 5638 break; 5639 case IPPROTO_AH: 5640 m = key_getcomb_ah(); 5641 break; 5642 case IPPROTO_IPCOMP: 5643 m = key_getcomb_ipcomp(); 5644 break; 5645 default: 5646 return NULL; 5647 } 5648 5649 if (!m) 5650 return NULL; 5651 M_PREPEND(m, l, M_DONTWAIT); 5652 if (!m) 5653 return NULL; 5654 5655 totlen = 0; 5656 for (n = m; n; n = n->m_next) 5657 totlen += n->m_len; 5658 5659 prop = mtod(m, struct sadb_prop *); 5660 bzero(prop, sizeof(*prop)); 5661 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5662 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5663 prop->sadb_prop_replay = 32; /* XXX */ 5664 5665 return m; 5666 } 5667 5668 /* 5669 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5670 * send 5671 * <base, SA, address(SD), (address(P)), x_policy, 5672 * (identity(SD),) (sensitivity,) proposal> 5673 * to KMD, and expect to receive 5674 * <base> with SADB_ACQUIRE if error occured, 5675 * or 5676 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5677 * from KMD by PF_KEY. 5678 * 5679 * XXX x_policy is outside of RFC2367 (KAME extension). 5680 * XXX sensitivity is not supported. 5681 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5682 * see comment for key_getcomb_ipcomp(). 5683 * 5684 * OUT: 5685 * 0 : succeed 5686 * others: error number 5687 */ 5688 static int 5689 key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5690 { 5691 struct mbuf *result = NULL, *m; 5692 struct secacq *newacq; 5693 u_int8_t satype; 5694 int error = -1; 5695 u_int32_t seq; 5696 5697 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 5698 satype = key_proto2satype(saidx->proto); 5699 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 5700 5701 /* 5702 * We never do anything about acquirng SA. There is anather 5703 * solution that kernel blocks to send SADB_ACQUIRE message until 5704 * getting something message from IKEd. In later case, to be 5705 * managed with ACQUIRING list. 5706 */ 5707 /* Get an entry to check whether sending message or not. */ 5708 if ((newacq = key_getacq(saidx)) != NULL) { 5709 if (V_key_blockacq_count < newacq->count) { 5710 /* reset counter and do send message. */ 5711 newacq->count = 0; 5712 } else { 5713 /* increment counter and do nothing. */ 5714 newacq->count++; 5715 return 0; 5716 } 5717 } else { 5718 /* make new entry for blocking to send SADB_ACQUIRE. */ 5719 if ((newacq = key_newacq(saidx)) == NULL) 5720 return ENOBUFS; 5721 } 5722 5723 5724 seq = newacq->seq; 5725 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5726 if (!m) { 5727 error = ENOBUFS; 5728 goto fail; 5729 } 5730 result = m; 5731 5732 /* set sadb_address for saidx's. */ 5733 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5734 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5735 if (!m) { 5736 error = ENOBUFS; 5737 goto fail; 5738 } 5739 m_cat(result, m); 5740 5741 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5742 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5743 if (!m) { 5744 error = ENOBUFS; 5745 goto fail; 5746 } 5747 m_cat(result, m); 5748 5749 /* XXX proxy address (optional) */ 5750 5751 /* set sadb_x_policy */ 5752 if (sp) { 5753 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5754 if (!m) { 5755 error = ENOBUFS; 5756 goto fail; 5757 } 5758 m_cat(result, m); 5759 } 5760 5761 /* XXX identity (optional) */ 5762 #if 0 5763 if (idexttype && fqdn) { 5764 /* create identity extension (FQDN) */ 5765 struct sadb_ident *id; 5766 int fqdnlen; 5767 5768 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5769 id = (struct sadb_ident *)p; 5770 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5771 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5772 id->sadb_ident_exttype = idexttype; 5773 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5774 bcopy(fqdn, id + 1, fqdnlen); 5775 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5776 } 5777 5778 if (idexttype) { 5779 /* create identity extension (USERFQDN) */ 5780 struct sadb_ident *id; 5781 int userfqdnlen; 5782 5783 if (userfqdn) { 5784 /* +1 for terminating-NUL */ 5785 userfqdnlen = strlen(userfqdn) + 1; 5786 } else 5787 userfqdnlen = 0; 5788 id = (struct sadb_ident *)p; 5789 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5790 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5791 id->sadb_ident_exttype = idexttype; 5792 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5793 /* XXX is it correct? */ 5794 if (curproc && curproc->p_cred) 5795 id->sadb_ident_id = curproc->p_cred->p_ruid; 5796 if (userfqdn && userfqdnlen) 5797 bcopy(userfqdn, id + 1, userfqdnlen); 5798 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5799 } 5800 #endif 5801 5802 /* XXX sensitivity (optional) */ 5803 5804 /* create proposal/combination extension */ 5805 m = key_getprop(saidx); 5806 #if 0 5807 /* 5808 * spec conformant: always attach proposal/combination extension, 5809 * the problem is that we have no way to attach it for ipcomp, 5810 * due to the way sadb_comb is declared in RFC2367. 5811 */ 5812 if (!m) { 5813 error = ENOBUFS; 5814 goto fail; 5815 } 5816 m_cat(result, m); 5817 #else 5818 /* 5819 * outside of spec; make proposal/combination extension optional. 5820 */ 5821 if (m) 5822 m_cat(result, m); 5823 #endif 5824 5825 if ((result->m_flags & M_PKTHDR) == 0) { 5826 error = EINVAL; 5827 goto fail; 5828 } 5829 5830 if (result->m_len < sizeof(struct sadb_msg)) { 5831 result = m_pullup(result, sizeof(struct sadb_msg)); 5832 if (result == NULL) { 5833 error = ENOBUFS; 5834 goto fail; 5835 } 5836 } 5837 5838 result->m_pkthdr.len = 0; 5839 for (m = result; m; m = m->m_next) 5840 result->m_pkthdr.len += m->m_len; 5841 5842 mtod(result, struct sadb_msg *)->sadb_msg_len = 5843 PFKEY_UNIT64(result->m_pkthdr.len); 5844 5845 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5846 5847 fail: 5848 if (result) 5849 m_freem(result); 5850 return error; 5851 } 5852 5853 static struct secacq * 5854 key_newacq(const struct secasindex *saidx) 5855 { 5856 struct secacq *newacq; 5857 5858 /* get new entry */ 5859 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5860 if (newacq == NULL) { 5861 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5862 return NULL; 5863 } 5864 5865 /* copy secindex */ 5866 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5867 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 5868 newacq->created = time_second; 5869 newacq->count = 0; 5870 5871 /* add to acqtree */ 5872 ACQ_LOCK(); 5873 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 5874 ACQ_UNLOCK(); 5875 5876 return newacq; 5877 } 5878 5879 static struct secacq * 5880 key_getacq(const struct secasindex *saidx) 5881 { 5882 struct secacq *acq; 5883 5884 ACQ_LOCK(); 5885 LIST_FOREACH(acq, &V_acqtree, chain) { 5886 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5887 break; 5888 } 5889 ACQ_UNLOCK(); 5890 5891 return acq; 5892 } 5893 5894 static struct secacq * 5895 key_getacqbyseq(seq) 5896 u_int32_t seq; 5897 { 5898 struct secacq *acq; 5899 5900 ACQ_LOCK(); 5901 LIST_FOREACH(acq, &V_acqtree, chain) { 5902 if (acq->seq == seq) 5903 break; 5904 } 5905 ACQ_UNLOCK(); 5906 5907 return acq; 5908 } 5909 5910 static struct secspacq * 5911 key_newspacq(spidx) 5912 struct secpolicyindex *spidx; 5913 { 5914 struct secspacq *acq; 5915 5916 /* get new entry */ 5917 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5918 if (acq == NULL) { 5919 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5920 return NULL; 5921 } 5922 5923 /* copy secindex */ 5924 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5925 acq->created = time_second; 5926 acq->count = 0; 5927 5928 /* add to spacqtree */ 5929 SPACQ_LOCK(); 5930 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 5931 SPACQ_UNLOCK(); 5932 5933 return acq; 5934 } 5935 5936 static struct secspacq * 5937 key_getspacq(spidx) 5938 struct secpolicyindex *spidx; 5939 { 5940 struct secspacq *acq; 5941 5942 SPACQ_LOCK(); 5943 LIST_FOREACH(acq, &V_spacqtree, chain) { 5944 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 5945 /* NB: return holding spacq_lock */ 5946 return acq; 5947 } 5948 } 5949 SPACQ_UNLOCK(); 5950 5951 return NULL; 5952 } 5953 5954 /* 5955 * SADB_ACQUIRE processing, 5956 * in first situation, is receiving 5957 * <base> 5958 * from the ikmpd, and clear sequence of its secasvar entry. 5959 * 5960 * In second situation, is receiving 5961 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5962 * from a user land process, and return 5963 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5964 * to the socket. 5965 * 5966 * m will always be freed. 5967 */ 5968 static int 5969 key_acquire2(so, m, mhp) 5970 struct socket *so; 5971 struct mbuf *m; 5972 const struct sadb_msghdr *mhp; 5973 { 5974 const struct sadb_address *src0, *dst0; 5975 struct secasindex saidx; 5976 struct secashead *sah; 5977 u_int16_t proto; 5978 int error; 5979 5980 IPSEC_ASSERT(so != NULL, ("null socket")); 5981 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5982 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5983 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5984 5985 /* 5986 * Error message from KMd. 5987 * We assume that if error was occured in IKEd, the length of PFKEY 5988 * message is equal to the size of sadb_msg structure. 5989 * We do not raise error even if error occured in this function. 5990 */ 5991 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 5992 struct secacq *acq; 5993 5994 /* check sequence number */ 5995 if (mhp->msg->sadb_msg_seq == 0) { 5996 ipseclog((LOG_DEBUG, "%s: must specify sequence " 5997 "number.\n", __func__)); 5998 m_freem(m); 5999 return 0; 6000 } 6001 6002 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6003 /* 6004 * the specified larval SA is already gone, or we got 6005 * a bogus sequence number. we can silently ignore it. 6006 */ 6007 m_freem(m); 6008 return 0; 6009 } 6010 6011 /* reset acq counter in order to deletion by timehander. */ 6012 acq->created = time_second; 6013 acq->count = 0; 6014 m_freem(m); 6015 return 0; 6016 } 6017 6018 /* 6019 * This message is from user land. 6020 */ 6021 6022 /* map satype to proto */ 6023 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6024 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6025 __func__)); 6026 return key_senderror(so, m, EINVAL); 6027 } 6028 6029 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6030 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6031 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6032 /* error */ 6033 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6034 __func__)); 6035 return key_senderror(so, m, EINVAL); 6036 } 6037 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6038 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6039 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6040 /* error */ 6041 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6042 __func__)); 6043 return key_senderror(so, m, EINVAL); 6044 } 6045 6046 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6047 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6048 6049 /* XXX boundary check against sa_len */ 6050 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6051 6052 /* get a SA index */ 6053 SAHTREE_LOCK(); 6054 LIST_FOREACH(sah, &V_sahtree, chain) { 6055 if (sah->state == SADB_SASTATE_DEAD) 6056 continue; 6057 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6058 break; 6059 } 6060 SAHTREE_UNLOCK(); 6061 if (sah != NULL) { 6062 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6063 return key_senderror(so, m, EEXIST); 6064 } 6065 6066 error = key_acquire(&saidx, NULL); 6067 if (error != 0) { 6068 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6069 __func__, mhp->msg->sadb_msg_errno)); 6070 return key_senderror(so, m, error); 6071 } 6072 6073 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6074 } 6075 6076 /* 6077 * SADB_REGISTER processing. 6078 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6079 * receive 6080 * <base> 6081 * from the ikmpd, and register a socket to send PF_KEY messages, 6082 * and send 6083 * <base, supported> 6084 * to KMD by PF_KEY. 6085 * If socket is detached, must free from regnode. 6086 * 6087 * m will always be freed. 6088 */ 6089 static int 6090 key_register(so, m, mhp) 6091 struct socket *so; 6092 struct mbuf *m; 6093 const struct sadb_msghdr *mhp; 6094 { 6095 struct secreg *reg, *newreg = 0; 6096 6097 IPSEC_ASSERT(so != NULL, ("null socket")); 6098 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6099 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6100 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6101 6102 /* check for invalid register message */ 6103 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6104 return key_senderror(so, m, EINVAL); 6105 6106 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6107 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6108 goto setmsg; 6109 6110 /* check whether existing or not */ 6111 REGTREE_LOCK(); 6112 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6113 if (reg->so == so) { 6114 REGTREE_UNLOCK(); 6115 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6116 __func__)); 6117 return key_senderror(so, m, EEXIST); 6118 } 6119 } 6120 6121 /* create regnode */ 6122 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6123 if (newreg == NULL) { 6124 REGTREE_UNLOCK(); 6125 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6126 return key_senderror(so, m, ENOBUFS); 6127 } 6128 6129 newreg->so = so; 6130 ((struct keycb *)sotorawcb(so))->kp_registered++; 6131 6132 /* add regnode to regtree. */ 6133 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6134 REGTREE_UNLOCK(); 6135 6136 setmsg: 6137 { 6138 struct mbuf *n; 6139 struct sadb_msg *newmsg; 6140 struct sadb_supported *sup; 6141 u_int len, alen, elen; 6142 int off; 6143 int i; 6144 struct sadb_alg *alg; 6145 6146 /* create new sadb_msg to reply. */ 6147 alen = 0; 6148 for (i = 1; i <= SADB_AALG_MAX; i++) { 6149 if (ah_algorithm_lookup(i)) 6150 alen += sizeof(struct sadb_alg); 6151 } 6152 if (alen) 6153 alen += sizeof(struct sadb_supported); 6154 elen = 0; 6155 for (i = 1; i <= SADB_EALG_MAX; i++) { 6156 if (esp_algorithm_lookup(i)) 6157 elen += sizeof(struct sadb_alg); 6158 } 6159 if (elen) 6160 elen += sizeof(struct sadb_supported); 6161 6162 len = sizeof(struct sadb_msg) + alen + elen; 6163 6164 if (len > MCLBYTES) 6165 return key_senderror(so, m, ENOBUFS); 6166 6167 MGETHDR(n, M_DONTWAIT, MT_DATA); 6168 if (len > MHLEN) { 6169 MCLGET(n, M_DONTWAIT); 6170 if ((n->m_flags & M_EXT) == 0) { 6171 m_freem(n); 6172 n = NULL; 6173 } 6174 } 6175 if (!n) 6176 return key_senderror(so, m, ENOBUFS); 6177 6178 n->m_pkthdr.len = n->m_len = len; 6179 n->m_next = NULL; 6180 off = 0; 6181 6182 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6183 newmsg = mtod(n, struct sadb_msg *); 6184 newmsg->sadb_msg_errno = 0; 6185 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6186 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6187 6188 /* for authentication algorithm */ 6189 if (alen) { 6190 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6191 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6192 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6193 off += PFKEY_ALIGN8(sizeof(*sup)); 6194 6195 for (i = 1; i <= SADB_AALG_MAX; i++) { 6196 struct auth_hash *aalgo; 6197 u_int16_t minkeysize, maxkeysize; 6198 6199 aalgo = ah_algorithm_lookup(i); 6200 if (!aalgo) 6201 continue; 6202 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6203 alg->sadb_alg_id = i; 6204 alg->sadb_alg_ivlen = 0; 6205 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6206 alg->sadb_alg_minbits = _BITS(minkeysize); 6207 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6208 off += PFKEY_ALIGN8(sizeof(*alg)); 6209 } 6210 } 6211 6212 /* for encryption algorithm */ 6213 if (elen) { 6214 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6215 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6216 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6217 off += PFKEY_ALIGN8(sizeof(*sup)); 6218 6219 for (i = 1; i <= SADB_EALG_MAX; i++) { 6220 struct enc_xform *ealgo; 6221 6222 ealgo = esp_algorithm_lookup(i); 6223 if (!ealgo) 6224 continue; 6225 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6226 alg->sadb_alg_id = i; 6227 alg->sadb_alg_ivlen = ealgo->blocksize; 6228 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6229 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6230 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6231 } 6232 } 6233 6234 IPSEC_ASSERT(off == len, 6235 ("length assumption failed (off %u len %u)", off, len)); 6236 6237 m_freem(m); 6238 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6239 } 6240 } 6241 6242 /* 6243 * free secreg entry registered. 6244 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6245 */ 6246 void 6247 key_freereg(struct socket *so) 6248 { 6249 struct secreg *reg; 6250 int i; 6251 6252 IPSEC_ASSERT(so != NULL, ("NULL so")); 6253 6254 /* 6255 * check whether existing or not. 6256 * check all type of SA, because there is a potential that 6257 * one socket is registered to multiple type of SA. 6258 */ 6259 REGTREE_LOCK(); 6260 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6261 LIST_FOREACH(reg, &V_regtree[i], chain) { 6262 if (reg->so == so && __LIST_CHAINED(reg)) { 6263 LIST_REMOVE(reg, chain); 6264 free(reg, M_IPSEC_SAR); 6265 break; 6266 } 6267 } 6268 } 6269 REGTREE_UNLOCK(); 6270 } 6271 6272 /* 6273 * SADB_EXPIRE processing 6274 * send 6275 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6276 * to KMD by PF_KEY. 6277 * NOTE: We send only soft lifetime extension. 6278 * 6279 * OUT: 0 : succeed 6280 * others : error number 6281 */ 6282 static int 6283 key_expire(struct secasvar *sav) 6284 { 6285 int s; 6286 int satype; 6287 struct mbuf *result = NULL, *m; 6288 int len; 6289 int error = -1; 6290 struct sadb_lifetime *lt; 6291 6292 /* XXX: Why do we lock ? */ 6293 s = splnet(); /*called from softclock()*/ 6294 6295 IPSEC_ASSERT (sav != NULL, ("null sav")); 6296 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6297 6298 /* set msg header */ 6299 satype = key_proto2satype(sav->sah->saidx.proto); 6300 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6301 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6302 if (!m) { 6303 error = ENOBUFS; 6304 goto fail; 6305 } 6306 result = m; 6307 6308 /* create SA extension */ 6309 m = key_setsadbsa(sav); 6310 if (!m) { 6311 error = ENOBUFS; 6312 goto fail; 6313 } 6314 m_cat(result, m); 6315 6316 /* create SA extension */ 6317 m = key_setsadbxsa2(sav->sah->saidx.mode, 6318 sav->replay ? sav->replay->count : 0, 6319 sav->sah->saidx.reqid); 6320 if (!m) { 6321 error = ENOBUFS; 6322 goto fail; 6323 } 6324 m_cat(result, m); 6325 6326 /* create lifetime extension (current and soft) */ 6327 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6328 m = key_alloc_mbuf(len); 6329 if (!m || m->m_next) { /*XXX*/ 6330 if (m) 6331 m_freem(m); 6332 error = ENOBUFS; 6333 goto fail; 6334 } 6335 bzero(mtod(m, caddr_t), len); 6336 lt = mtod(m, struct sadb_lifetime *); 6337 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6338 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6339 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6340 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6341 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6342 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6343 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6344 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6345 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6346 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6347 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6348 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6349 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6350 m_cat(result, m); 6351 6352 /* set sadb_address for source */ 6353 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6354 &sav->sah->saidx.src.sa, 6355 FULLMASK, IPSEC_ULPROTO_ANY); 6356 if (!m) { 6357 error = ENOBUFS; 6358 goto fail; 6359 } 6360 m_cat(result, m); 6361 6362 /* set sadb_address for destination */ 6363 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6364 &sav->sah->saidx.dst.sa, 6365 FULLMASK, IPSEC_ULPROTO_ANY); 6366 if (!m) { 6367 error = ENOBUFS; 6368 goto fail; 6369 } 6370 m_cat(result, m); 6371 6372 if ((result->m_flags & M_PKTHDR) == 0) { 6373 error = EINVAL; 6374 goto fail; 6375 } 6376 6377 if (result->m_len < sizeof(struct sadb_msg)) { 6378 result = m_pullup(result, sizeof(struct sadb_msg)); 6379 if (result == NULL) { 6380 error = ENOBUFS; 6381 goto fail; 6382 } 6383 } 6384 6385 result->m_pkthdr.len = 0; 6386 for (m = result; m; m = m->m_next) 6387 result->m_pkthdr.len += m->m_len; 6388 6389 mtod(result, struct sadb_msg *)->sadb_msg_len = 6390 PFKEY_UNIT64(result->m_pkthdr.len); 6391 6392 splx(s); 6393 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6394 6395 fail: 6396 if (result) 6397 m_freem(result); 6398 splx(s); 6399 return error; 6400 } 6401 6402 /* 6403 * SADB_FLUSH processing 6404 * receive 6405 * <base> 6406 * from the ikmpd, and free all entries in secastree. 6407 * and send, 6408 * <base> 6409 * to the ikmpd. 6410 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6411 * 6412 * m will always be freed. 6413 */ 6414 static int 6415 key_flush(so, m, mhp) 6416 struct socket *so; 6417 struct mbuf *m; 6418 const struct sadb_msghdr *mhp; 6419 { 6420 struct sadb_msg *newmsg; 6421 struct secashead *sah, *nextsah; 6422 struct secasvar *sav, *nextsav; 6423 u_int16_t proto; 6424 u_int8_t state; 6425 u_int stateidx; 6426 6427 IPSEC_ASSERT(so != NULL, ("null socket")); 6428 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6429 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6430 6431 /* map satype to proto */ 6432 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6433 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6434 __func__)); 6435 return key_senderror(so, m, EINVAL); 6436 } 6437 6438 /* no SATYPE specified, i.e. flushing all SA. */ 6439 SAHTREE_LOCK(); 6440 for (sah = LIST_FIRST(&V_sahtree); 6441 sah != NULL; 6442 sah = nextsah) { 6443 nextsah = LIST_NEXT(sah, chain); 6444 6445 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6446 && proto != sah->saidx.proto) 6447 continue; 6448 6449 for (stateidx = 0; 6450 stateidx < _ARRAYLEN(V_saorder_state_alive); 6451 stateidx++) { 6452 state = V_saorder_state_any[stateidx]; 6453 for (sav = LIST_FIRST(&sah->savtree[state]); 6454 sav != NULL; 6455 sav = nextsav) { 6456 6457 nextsav = LIST_NEXT(sav, chain); 6458 6459 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6460 KEY_FREESAV(&sav); 6461 } 6462 } 6463 6464 sah->state = SADB_SASTATE_DEAD; 6465 } 6466 SAHTREE_UNLOCK(); 6467 6468 if (m->m_len < sizeof(struct sadb_msg) || 6469 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6470 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6471 return key_senderror(so, m, ENOBUFS); 6472 } 6473 6474 if (m->m_next) 6475 m_freem(m->m_next); 6476 m->m_next = NULL; 6477 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6478 newmsg = mtod(m, struct sadb_msg *); 6479 newmsg->sadb_msg_errno = 0; 6480 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6481 6482 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6483 } 6484 6485 /* 6486 * SADB_DUMP processing 6487 * dump all entries including status of DEAD in SAD. 6488 * receive 6489 * <base> 6490 * from the ikmpd, and dump all secasvar leaves 6491 * and send, 6492 * <base> ..... 6493 * to the ikmpd. 6494 * 6495 * m will always be freed. 6496 */ 6497 static int 6498 key_dump(so, m, mhp) 6499 struct socket *so; 6500 struct mbuf *m; 6501 const struct sadb_msghdr *mhp; 6502 { 6503 struct secashead *sah; 6504 struct secasvar *sav; 6505 u_int16_t proto; 6506 u_int stateidx; 6507 u_int8_t satype; 6508 u_int8_t state; 6509 int cnt; 6510 struct sadb_msg *newmsg; 6511 struct mbuf *n; 6512 6513 IPSEC_ASSERT(so != NULL, ("null socket")); 6514 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6515 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6516 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6517 6518 /* map satype to proto */ 6519 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6520 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6521 __func__)); 6522 return key_senderror(so, m, EINVAL); 6523 } 6524 6525 /* count sav entries to be sent to the userland. */ 6526 cnt = 0; 6527 SAHTREE_LOCK(); 6528 LIST_FOREACH(sah, &V_sahtree, chain) { 6529 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6530 && proto != sah->saidx.proto) 6531 continue; 6532 6533 for (stateidx = 0; 6534 stateidx < _ARRAYLEN(V_saorder_state_any); 6535 stateidx++) { 6536 state = V_saorder_state_any[stateidx]; 6537 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6538 cnt++; 6539 } 6540 } 6541 } 6542 6543 if (cnt == 0) { 6544 SAHTREE_UNLOCK(); 6545 return key_senderror(so, m, ENOENT); 6546 } 6547 6548 /* send this to the userland, one at a time. */ 6549 newmsg = NULL; 6550 LIST_FOREACH(sah, &V_sahtree, chain) { 6551 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6552 && proto != sah->saidx.proto) 6553 continue; 6554 6555 /* map proto to satype */ 6556 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6557 SAHTREE_UNLOCK(); 6558 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 6559 "SAD.\n", __func__)); 6560 return key_senderror(so, m, EINVAL); 6561 } 6562 6563 for (stateidx = 0; 6564 stateidx < _ARRAYLEN(V_saorder_state_any); 6565 stateidx++) { 6566 state = V_saorder_state_any[stateidx]; 6567 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6568 n = key_setdumpsa(sav, SADB_DUMP, satype, 6569 --cnt, mhp->msg->sadb_msg_pid); 6570 if (!n) { 6571 SAHTREE_UNLOCK(); 6572 return key_senderror(so, m, ENOBUFS); 6573 } 6574 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6575 } 6576 } 6577 } 6578 SAHTREE_UNLOCK(); 6579 6580 m_freem(m); 6581 return 0; 6582 } 6583 6584 /* 6585 * SADB_X_PROMISC processing 6586 * 6587 * m will always be freed. 6588 */ 6589 static int 6590 key_promisc(so, m, mhp) 6591 struct socket *so; 6592 struct mbuf *m; 6593 const struct sadb_msghdr *mhp; 6594 { 6595 int olen; 6596 6597 IPSEC_ASSERT(so != NULL, ("null socket")); 6598 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6599 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6600 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6601 6602 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6603 6604 if (olen < sizeof(struct sadb_msg)) { 6605 #if 1 6606 return key_senderror(so, m, EINVAL); 6607 #else 6608 m_freem(m); 6609 return 0; 6610 #endif 6611 } else if (olen == sizeof(struct sadb_msg)) { 6612 /* enable/disable promisc mode */ 6613 struct keycb *kp; 6614 6615 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6616 return key_senderror(so, m, EINVAL); 6617 mhp->msg->sadb_msg_errno = 0; 6618 switch (mhp->msg->sadb_msg_satype) { 6619 case 0: 6620 case 1: 6621 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6622 break; 6623 default: 6624 return key_senderror(so, m, EINVAL); 6625 } 6626 6627 /* send the original message back to everyone */ 6628 mhp->msg->sadb_msg_errno = 0; 6629 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6630 } else { 6631 /* send packet as is */ 6632 6633 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6634 6635 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6636 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6637 } 6638 } 6639 6640 static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6641 const struct sadb_msghdr *)) = { 6642 NULL, /* SADB_RESERVED */ 6643 key_getspi, /* SADB_GETSPI */ 6644 key_update, /* SADB_UPDATE */ 6645 key_add, /* SADB_ADD */ 6646 key_delete, /* SADB_DELETE */ 6647 key_get, /* SADB_GET */ 6648 key_acquire2, /* SADB_ACQUIRE */ 6649 key_register, /* SADB_REGISTER */ 6650 NULL, /* SADB_EXPIRE */ 6651 key_flush, /* SADB_FLUSH */ 6652 key_dump, /* SADB_DUMP */ 6653 key_promisc, /* SADB_X_PROMISC */ 6654 NULL, /* SADB_X_PCHANGE */ 6655 key_spdadd, /* SADB_X_SPDUPDATE */ 6656 key_spdadd, /* SADB_X_SPDADD */ 6657 key_spddelete, /* SADB_X_SPDDELETE */ 6658 key_spdget, /* SADB_X_SPDGET */ 6659 NULL, /* SADB_X_SPDACQUIRE */ 6660 key_spddump, /* SADB_X_SPDDUMP */ 6661 key_spdflush, /* SADB_X_SPDFLUSH */ 6662 key_spdadd, /* SADB_X_SPDSETIDX */ 6663 NULL, /* SADB_X_SPDEXPIRE */ 6664 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6665 }; 6666 6667 /* 6668 * parse sadb_msg buffer to process PFKEYv2, 6669 * and create a data to response if needed. 6670 * I think to be dealed with mbuf directly. 6671 * IN: 6672 * msgp : pointer to pointer to a received buffer pulluped. 6673 * This is rewrited to response. 6674 * so : pointer to socket. 6675 * OUT: 6676 * length for buffer to send to user process. 6677 */ 6678 int 6679 key_parse(m, so) 6680 struct mbuf *m; 6681 struct socket *so; 6682 { 6683 struct sadb_msg *msg; 6684 struct sadb_msghdr mh; 6685 u_int orglen; 6686 int error; 6687 int target; 6688 6689 IPSEC_ASSERT(so != NULL, ("null socket")); 6690 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6691 6692 #if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6693 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6694 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 6695 kdebug_sadb(msg)); 6696 #endif 6697 6698 if (m->m_len < sizeof(struct sadb_msg)) { 6699 m = m_pullup(m, sizeof(struct sadb_msg)); 6700 if (!m) 6701 return ENOBUFS; 6702 } 6703 msg = mtod(m, struct sadb_msg *); 6704 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6705 target = KEY_SENDUP_ONE; 6706 6707 if ((m->m_flags & M_PKTHDR) == 0 || 6708 m->m_pkthdr.len != m->m_pkthdr.len) { 6709 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 6710 V_pfkeystat.out_invlen++; 6711 error = EINVAL; 6712 goto senderror; 6713 } 6714 6715 if (msg->sadb_msg_version != PF_KEY_V2) { 6716 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 6717 __func__, msg->sadb_msg_version)); 6718 V_pfkeystat.out_invver++; 6719 error = EINVAL; 6720 goto senderror; 6721 } 6722 6723 if (msg->sadb_msg_type > SADB_MAX) { 6724 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6725 __func__, msg->sadb_msg_type)); 6726 V_pfkeystat.out_invmsgtype++; 6727 error = EINVAL; 6728 goto senderror; 6729 } 6730 6731 /* for old-fashioned code - should be nuked */ 6732 if (m->m_pkthdr.len > MCLBYTES) { 6733 m_freem(m); 6734 return ENOBUFS; 6735 } 6736 if (m->m_next) { 6737 struct mbuf *n; 6738 6739 MGETHDR(n, M_DONTWAIT, MT_DATA); 6740 if (n && m->m_pkthdr.len > MHLEN) { 6741 MCLGET(n, M_DONTWAIT); 6742 if ((n->m_flags & M_EXT) == 0) { 6743 m_free(n); 6744 n = NULL; 6745 } 6746 } 6747 if (!n) { 6748 m_freem(m); 6749 return ENOBUFS; 6750 } 6751 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6752 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6753 n->m_next = NULL; 6754 m_freem(m); 6755 m = n; 6756 } 6757 6758 /* align the mbuf chain so that extensions are in contiguous region. */ 6759 error = key_align(m, &mh); 6760 if (error) 6761 return error; 6762 6763 msg = mh.msg; 6764 6765 /* check SA type */ 6766 switch (msg->sadb_msg_satype) { 6767 case SADB_SATYPE_UNSPEC: 6768 switch (msg->sadb_msg_type) { 6769 case SADB_GETSPI: 6770 case SADB_UPDATE: 6771 case SADB_ADD: 6772 case SADB_DELETE: 6773 case SADB_GET: 6774 case SADB_ACQUIRE: 6775 case SADB_EXPIRE: 6776 ipseclog((LOG_DEBUG, "%s: must specify satype " 6777 "when msg type=%u.\n", __func__, 6778 msg->sadb_msg_type)); 6779 V_pfkeystat.out_invsatype++; 6780 error = EINVAL; 6781 goto senderror; 6782 } 6783 break; 6784 case SADB_SATYPE_AH: 6785 case SADB_SATYPE_ESP: 6786 case SADB_X_SATYPE_IPCOMP: 6787 case SADB_X_SATYPE_TCPSIGNATURE: 6788 switch (msg->sadb_msg_type) { 6789 case SADB_X_SPDADD: 6790 case SADB_X_SPDDELETE: 6791 case SADB_X_SPDGET: 6792 case SADB_X_SPDDUMP: 6793 case SADB_X_SPDFLUSH: 6794 case SADB_X_SPDSETIDX: 6795 case SADB_X_SPDUPDATE: 6796 case SADB_X_SPDDELETE2: 6797 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 6798 __func__, msg->sadb_msg_type)); 6799 V_pfkeystat.out_invsatype++; 6800 error = EINVAL; 6801 goto senderror; 6802 } 6803 break; 6804 case SADB_SATYPE_RSVP: 6805 case SADB_SATYPE_OSPFV2: 6806 case SADB_SATYPE_RIPV2: 6807 case SADB_SATYPE_MIP: 6808 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 6809 __func__, msg->sadb_msg_satype)); 6810 V_pfkeystat.out_invsatype++; 6811 error = EOPNOTSUPP; 6812 goto senderror; 6813 case 1: /* XXX: What does it do? */ 6814 if (msg->sadb_msg_type == SADB_X_PROMISC) 6815 break; 6816 /*FALLTHROUGH*/ 6817 default: 6818 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6819 __func__, msg->sadb_msg_satype)); 6820 V_pfkeystat.out_invsatype++; 6821 error = EINVAL; 6822 goto senderror; 6823 } 6824 6825 /* check field of upper layer protocol and address family */ 6826 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6827 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6828 struct sadb_address *src0, *dst0; 6829 u_int plen; 6830 6831 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6832 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6833 6834 /* check upper layer protocol */ 6835 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6836 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 6837 "mismatched.\n", __func__)); 6838 V_pfkeystat.out_invaddr++; 6839 error = EINVAL; 6840 goto senderror; 6841 } 6842 6843 /* check family */ 6844 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6845 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6846 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 6847 __func__)); 6848 V_pfkeystat.out_invaddr++; 6849 error = EINVAL; 6850 goto senderror; 6851 } 6852 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6853 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6854 ipseclog((LOG_DEBUG, "%s: address struct size " 6855 "mismatched.\n", __func__)); 6856 V_pfkeystat.out_invaddr++; 6857 error = EINVAL; 6858 goto senderror; 6859 } 6860 6861 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6862 case AF_INET: 6863 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6864 sizeof(struct sockaddr_in)) { 6865 V_pfkeystat.out_invaddr++; 6866 error = EINVAL; 6867 goto senderror; 6868 } 6869 break; 6870 case AF_INET6: 6871 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6872 sizeof(struct sockaddr_in6)) { 6873 V_pfkeystat.out_invaddr++; 6874 error = EINVAL; 6875 goto senderror; 6876 } 6877 break; 6878 default: 6879 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 6880 __func__)); 6881 V_pfkeystat.out_invaddr++; 6882 error = EAFNOSUPPORT; 6883 goto senderror; 6884 } 6885 6886 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6887 case AF_INET: 6888 plen = sizeof(struct in_addr) << 3; 6889 break; 6890 case AF_INET6: 6891 plen = sizeof(struct in6_addr) << 3; 6892 break; 6893 default: 6894 plen = 0; /*fool gcc*/ 6895 break; 6896 } 6897 6898 /* check max prefix length */ 6899 if (src0->sadb_address_prefixlen > plen || 6900 dst0->sadb_address_prefixlen > plen) { 6901 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 6902 __func__)); 6903 V_pfkeystat.out_invaddr++; 6904 error = EINVAL; 6905 goto senderror; 6906 } 6907 6908 /* 6909 * prefixlen == 0 is valid because there can be a case when 6910 * all addresses are matched. 6911 */ 6912 } 6913 6914 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6915 key_typesw[msg->sadb_msg_type] == NULL) { 6916 V_pfkeystat.out_invmsgtype++; 6917 error = EINVAL; 6918 goto senderror; 6919 } 6920 6921 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6922 6923 senderror: 6924 msg->sadb_msg_errno = error; 6925 return key_sendup_mbuf(so, m, target); 6926 } 6927 6928 static int 6929 key_senderror(so, m, code) 6930 struct socket *so; 6931 struct mbuf *m; 6932 int code; 6933 { 6934 struct sadb_msg *msg; 6935 6936 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6937 ("mbuf too small, len %u", m->m_len)); 6938 6939 msg = mtod(m, struct sadb_msg *); 6940 msg->sadb_msg_errno = code; 6941 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 6942 } 6943 6944 /* 6945 * set the pointer to each header into message buffer. 6946 * m will be freed on error. 6947 * XXX larger-than-MCLBYTES extension? 6948 */ 6949 static int 6950 key_align(m, mhp) 6951 struct mbuf *m; 6952 struct sadb_msghdr *mhp; 6953 { 6954 struct mbuf *n; 6955 struct sadb_ext *ext; 6956 size_t off, end; 6957 int extlen; 6958 int toff; 6959 6960 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6961 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6962 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6963 ("mbuf too small, len %u", m->m_len)); 6964 6965 /* initialize */ 6966 bzero(mhp, sizeof(*mhp)); 6967 6968 mhp->msg = mtod(m, struct sadb_msg *); 6969 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 6970 6971 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6972 extlen = end; /*just in case extlen is not updated*/ 6973 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 6974 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 6975 if (!n) { 6976 /* m is already freed */ 6977 return ENOBUFS; 6978 } 6979 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 6980 6981 /* set pointer */ 6982 switch (ext->sadb_ext_type) { 6983 case SADB_EXT_SA: 6984 case SADB_EXT_ADDRESS_SRC: 6985 case SADB_EXT_ADDRESS_DST: 6986 case SADB_EXT_ADDRESS_PROXY: 6987 case SADB_EXT_LIFETIME_CURRENT: 6988 case SADB_EXT_LIFETIME_HARD: 6989 case SADB_EXT_LIFETIME_SOFT: 6990 case SADB_EXT_KEY_AUTH: 6991 case SADB_EXT_KEY_ENCRYPT: 6992 case SADB_EXT_IDENTITY_SRC: 6993 case SADB_EXT_IDENTITY_DST: 6994 case SADB_EXT_SENSITIVITY: 6995 case SADB_EXT_PROPOSAL: 6996 case SADB_EXT_SUPPORTED_AUTH: 6997 case SADB_EXT_SUPPORTED_ENCRYPT: 6998 case SADB_EXT_SPIRANGE: 6999 case SADB_X_EXT_POLICY: 7000 case SADB_X_EXT_SA2: 7001 /* duplicate check */ 7002 /* 7003 * XXX Are there duplication payloads of either 7004 * KEY_AUTH or KEY_ENCRYPT ? 7005 */ 7006 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7007 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7008 "%u\n", __func__, ext->sadb_ext_type)); 7009 m_freem(m); 7010 V_pfkeystat.out_dupext++; 7011 return EINVAL; 7012 } 7013 break; 7014 default: 7015 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7016 __func__, ext->sadb_ext_type)); 7017 m_freem(m); 7018 V_pfkeystat.out_invexttype++; 7019 return EINVAL; 7020 } 7021 7022 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7023 7024 if (key_validate_ext(ext, extlen)) { 7025 m_freem(m); 7026 V_pfkeystat.out_invlen++; 7027 return EINVAL; 7028 } 7029 7030 n = m_pulldown(m, off, extlen, &toff); 7031 if (!n) { 7032 /* m is already freed */ 7033 return ENOBUFS; 7034 } 7035 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7036 7037 mhp->ext[ext->sadb_ext_type] = ext; 7038 mhp->extoff[ext->sadb_ext_type] = off; 7039 mhp->extlen[ext->sadb_ext_type] = extlen; 7040 } 7041 7042 if (off != end) { 7043 m_freem(m); 7044 V_pfkeystat.out_invlen++; 7045 return EINVAL; 7046 } 7047 7048 return 0; 7049 } 7050 7051 static int 7052 key_validate_ext(ext, len) 7053 const struct sadb_ext *ext; 7054 int len; 7055 { 7056 const struct sockaddr *sa; 7057 enum { NONE, ADDR } checktype = NONE; 7058 int baselen = 0; 7059 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7060 7061 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7062 return EINVAL; 7063 7064 /* if it does not match minimum/maximum length, bail */ 7065 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7066 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7067 return EINVAL; 7068 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7069 return EINVAL; 7070 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7071 return EINVAL; 7072 7073 /* more checks based on sadb_ext_type XXX need more */ 7074 switch (ext->sadb_ext_type) { 7075 case SADB_EXT_ADDRESS_SRC: 7076 case SADB_EXT_ADDRESS_DST: 7077 case SADB_EXT_ADDRESS_PROXY: 7078 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7079 checktype = ADDR; 7080 break; 7081 case SADB_EXT_IDENTITY_SRC: 7082 case SADB_EXT_IDENTITY_DST: 7083 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7084 SADB_X_IDENTTYPE_ADDR) { 7085 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7086 checktype = ADDR; 7087 } else 7088 checktype = NONE; 7089 break; 7090 default: 7091 checktype = NONE; 7092 break; 7093 } 7094 7095 switch (checktype) { 7096 case NONE: 7097 break; 7098 case ADDR: 7099 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7100 if (len < baselen + sal) 7101 return EINVAL; 7102 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7103 return EINVAL; 7104 break; 7105 } 7106 7107 return 0; 7108 } 7109 7110 void 7111 key_init(void) 7112 { 7113 int i; 7114 7115 SPTREE_LOCK_INIT(); 7116 REGTREE_LOCK_INIT(); 7117 SAHTREE_LOCK_INIT(); 7118 ACQ_LOCK_INIT(); 7119 SPACQ_LOCK_INIT(); 7120 7121 for (i = 0; i < IPSEC_DIR_MAX; i++) 7122 LIST_INIT(&V_sptree[i]); 7123 7124 LIST_INIT(&V_sahtree); 7125 7126 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7127 LIST_INIT(&V_regtree[i]); 7128 7129 LIST_INIT(&V_acqtree); 7130 LIST_INIT(&V_spacqtree); 7131 7132 /* system default */ 7133 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7134 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7135 7136 #ifndef IPSEC_DEBUG2 7137 timeout((void *)key_timehandler, (void *)0, hz); 7138 #endif /*IPSEC_DEBUG2*/ 7139 7140 /* initialize key statistics */ 7141 keystat.getspi_count = 1; 7142 7143 printf("IPsec: Initialized Security Association Processing.\n"); 7144 7145 return; 7146 } 7147 7148 /* 7149 * XXX: maybe This function is called after INBOUND IPsec processing. 7150 * 7151 * Special check for tunnel-mode packets. 7152 * We must make some checks for consistency between inner and outer IP header. 7153 * 7154 * xxx more checks to be provided 7155 */ 7156 int 7157 key_checktunnelsanity(sav, family, src, dst) 7158 struct secasvar *sav; 7159 u_int family; 7160 caddr_t src; 7161 caddr_t dst; 7162 { 7163 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7164 7165 /* XXX: check inner IP header */ 7166 7167 return 1; 7168 } 7169 7170 /* record data transfer on SA, and update timestamps */ 7171 void 7172 key_sa_recordxfer(sav, m) 7173 struct secasvar *sav; 7174 struct mbuf *m; 7175 { 7176 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7177 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7178 if (!sav->lft_c) 7179 return; 7180 7181 /* 7182 * XXX Currently, there is a difference of bytes size 7183 * between inbound and outbound processing. 7184 */ 7185 sav->lft_c->bytes += m->m_pkthdr.len; 7186 /* to check bytes lifetime is done in key_timehandler(). */ 7187 7188 /* 7189 * We use the number of packets as the unit of 7190 * allocations. We increment the variable 7191 * whenever {esp,ah}_{in,out}put is called. 7192 */ 7193 sav->lft_c->allocations++; 7194 /* XXX check for expires? */ 7195 7196 /* 7197 * NOTE: We record CURRENT usetime by using wall clock, 7198 * in seconds. HARD and SOFT lifetime are measured by the time 7199 * difference (again in seconds) from usetime. 7200 * 7201 * usetime 7202 * v expire expire 7203 * -----+-----+--------+---> t 7204 * <--------------> HARD 7205 * <-----> SOFT 7206 */ 7207 sav->lft_c->usetime = time_second; 7208 /* XXX check for expires? */ 7209 7210 return; 7211 } 7212 7213 /* dumb version */ 7214 void 7215 key_sa_routechange(dst) 7216 struct sockaddr *dst; 7217 { 7218 struct secashead *sah; 7219 struct route *ro; 7220 7221 SAHTREE_LOCK(); 7222 LIST_FOREACH(sah, &V_sahtree, chain) { 7223 ro = &sah->sa_route; 7224 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7225 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7226 RTFREE(ro->ro_rt); 7227 ro->ro_rt = (struct rtentry *)NULL; 7228 } 7229 } 7230 SAHTREE_UNLOCK(); 7231 } 7232 7233 static void 7234 key_sa_chgstate(sav, state) 7235 struct secasvar *sav; 7236 u_int8_t state; 7237 { 7238 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7239 SAHTREE_LOCK_ASSERT(); 7240 7241 if (sav->state != state) { 7242 if (__LIST_CHAINED(sav)) 7243 LIST_REMOVE(sav, chain); 7244 sav->state = state; 7245 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7246 } 7247 } 7248 7249 void 7250 key_sa_stir_iv(sav) 7251 struct secasvar *sav; 7252 { 7253 7254 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7255 key_randomfill(sav->iv, sav->ivlen); 7256 } 7257 7258 /* XXX too much? */ 7259 static struct mbuf * 7260 key_alloc_mbuf(l) 7261 int l; 7262 { 7263 struct mbuf *m = NULL, *n; 7264 int len, t; 7265 7266 len = l; 7267 while (len > 0) { 7268 MGET(n, M_DONTWAIT, MT_DATA); 7269 if (n && len > MLEN) 7270 MCLGET(n, M_DONTWAIT); 7271 if (!n) { 7272 m_freem(m); 7273 return NULL; 7274 } 7275 7276 n->m_next = NULL; 7277 n->m_len = 0; 7278 n->m_len = M_TRAILINGSPACE(n); 7279 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7280 if (n->m_len > len) { 7281 t = (n->m_len - len) & ~(sizeof(long) - 1); 7282 n->m_data += t; 7283 n->m_len = len; 7284 } 7285 7286 len -= n->m_len; 7287 7288 if (m) 7289 m_cat(m, n); 7290 else 7291 m = n; 7292 } 7293 7294 return m; 7295 } 7296 7297 /* 7298 * Take one of the kernel's security keys and convert it into a PF_KEY 7299 * structure within an mbuf, suitable for sending up to a waiting 7300 * application in user land. 7301 * 7302 * IN: 7303 * src: A pointer to a kernel security key. 7304 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7305 * OUT: 7306 * a valid mbuf or NULL indicating an error 7307 * 7308 */ 7309 7310 static struct mbuf * 7311 key_setkey(struct seckey *src, u_int16_t exttype) 7312 { 7313 struct mbuf *m; 7314 struct sadb_key *p; 7315 int len; 7316 7317 if (src == NULL) 7318 return NULL; 7319 7320 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7321 m = key_alloc_mbuf(len); 7322 if (m == NULL) 7323 return NULL; 7324 p = mtod(m, struct sadb_key *); 7325 bzero(p, len); 7326 p->sadb_key_len = PFKEY_UNIT64(len); 7327 p->sadb_key_exttype = exttype; 7328 p->sadb_key_bits = src->bits; 7329 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7330 7331 return m; 7332 } 7333 7334 /* 7335 * Take one of the kernel's lifetime data structures and convert it 7336 * into a PF_KEY structure within an mbuf, suitable for sending up to 7337 * a waiting application in user land. 7338 * 7339 * IN: 7340 * src: A pointer to a kernel lifetime structure. 7341 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7342 * data structures for more information. 7343 * OUT: 7344 * a valid mbuf or NULL indicating an error 7345 * 7346 */ 7347 7348 static struct mbuf * 7349 key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7350 { 7351 struct mbuf *m = NULL; 7352 struct sadb_lifetime *p; 7353 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7354 7355 if (src == NULL) 7356 return NULL; 7357 7358 m = key_alloc_mbuf(len); 7359 if (m == NULL) 7360 return m; 7361 p = mtod(m, struct sadb_lifetime *); 7362 7363 bzero(p, len); 7364 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7365 p->sadb_lifetime_exttype = exttype; 7366 p->sadb_lifetime_allocations = src->allocations; 7367 p->sadb_lifetime_bytes = src->bytes; 7368 p->sadb_lifetime_addtime = src->addtime; 7369 p->sadb_lifetime_usetime = src->usetime; 7370 7371 return m; 7372 7373 } 7374