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 #include <sys/vimage.h> 60 61 #include <net/if.h> 62 #include <net/route.h> 63 #include <net/raw_cb.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #include <netinet/ip.h> 68 #include <netinet/in_var.h> 69 70 #ifdef INET6 71 #include <netinet/ip6.h> 72 #include <netinet6/in6_var.h> 73 #include <netinet6/ip6_var.h> 74 #endif /* INET6 */ 75 76 #ifdef INET 77 #include <netinet/in_pcb.h> 78 #include <netinet/vinet.h> 79 #endif 80 #ifdef INET6 81 #include <netinet6/in6_pcb.h> 82 #include <netinet6/vinet6.h> 83 #endif /* INET6 */ 84 85 #include <net/pfkeyv2.h> 86 #include <netipsec/keydb.h> 87 #include <netipsec/key.h> 88 #include <netipsec/keysock.h> 89 #include <netipsec/key_debug.h> 90 91 #include <netipsec/ipsec.h> 92 #ifdef INET6 93 #include <netipsec/ipsec6.h> 94 #endif 95 96 #include <netipsec/xform.h> 97 98 #include <machine/stdarg.h> 99 100 /* randomness */ 101 #include <sys/random.h> 102 #include <sys/vimage.h> 103 104 #define FULLMASK 0xff 105 #define _BITS(bytes) ((bytes) << 3) 106 107 /* 108 * Note on SA reference counting: 109 * - SAs that are not in DEAD state will have (total external reference + 1) 110 * following value in reference count field. they cannot be freed and are 111 * referenced from SA header. 112 * - SAs that are in DEAD state will have (total external reference) 113 * in reference count field. they are ready to be freed. reference from 114 * SA header will be removed in key_delsav(), when the reference count 115 * field hits 0 (= no external reference other than from SA header. 116 */ 117 118 #ifdef VIMAGE_GLOBALS 119 u_int32_t key_debug_level; 120 static u_int key_spi_trycnt; 121 static u_int32_t key_spi_minval; 122 static u_int32_t key_spi_maxval; 123 static u_int32_t policy_id; 124 static u_int key_int_random; 125 static u_int key_larval_lifetime; 126 static int key_blockacq_count; 127 static int key_blockacq_lifetime; 128 static int key_preferred_oldsa; 129 130 static u_int32_t acq_seq; 131 132 static int ipsec_esp_keymin; 133 static int ipsec_esp_auth; 134 static int ipsec_ah_keymin; 135 136 static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */ 137 static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ 138 static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; 139 static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ 140 static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ 141 #endif /* VIMAGE_GLOBALS */ 142 143 static struct mtx sptree_lock; 144 #define SPTREE_LOCK_INIT() \ 145 mtx_init(&sptree_lock, "sptree", \ 146 "fast ipsec security policy database", MTX_DEF) 147 #define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 148 #define SPTREE_LOCK() mtx_lock(&sptree_lock) 149 #define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 150 #define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 151 152 static struct mtx sahtree_lock; 153 #define SAHTREE_LOCK_INIT() \ 154 mtx_init(&sahtree_lock, "sahtree", \ 155 "fast ipsec security association database", MTX_DEF) 156 #define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 157 #define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 158 #define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 159 #define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 160 161 /* registed list */ 162 static struct mtx regtree_lock; 163 #define REGTREE_LOCK_INIT() \ 164 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 165 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 166 #define REGTREE_LOCK() mtx_lock(®tree_lock) 167 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 168 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 169 170 static struct mtx acq_lock; 171 #define ACQ_LOCK_INIT() \ 172 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 173 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 174 #define ACQ_LOCK() mtx_lock(&acq_lock) 175 #define ACQ_UNLOCK() mtx_unlock(&acq_lock) 176 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 177 178 static struct mtx spacq_lock; 179 #define SPACQ_LOCK_INIT() \ 180 mtx_init(&spacq_lock, "spacqtree", \ 181 "fast ipsec security policy acquire list", MTX_DEF) 182 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 183 #define SPACQ_LOCK() mtx_lock(&spacq_lock) 184 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 185 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 186 187 /* search order for SAs */ 188 static const u_int saorder_state_valid_prefer_old[] = { 189 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 190 }; 191 static const u_int saorder_state_valid_prefer_new[] = { 192 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 193 }; 194 static const u_int saorder_state_alive[] = { 195 /* except DEAD */ 196 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 197 }; 198 static const u_int saorder_state_any[] = { 199 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 200 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 201 }; 202 203 static const int minsize[] = { 204 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 205 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 206 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 207 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 208 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 209 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 210 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 211 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 212 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 213 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 214 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 215 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 216 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 217 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 218 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 219 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 220 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 221 0, /* SADB_X_EXT_KMPRIVATE */ 222 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 223 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 224 }; 225 static const int maxsize[] = { 226 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 227 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 228 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 229 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 230 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 231 0, /* SADB_EXT_ADDRESS_SRC */ 232 0, /* SADB_EXT_ADDRESS_DST */ 233 0, /* SADB_EXT_ADDRESS_PROXY */ 234 0, /* SADB_EXT_KEY_AUTH */ 235 0, /* SADB_EXT_KEY_ENCRYPT */ 236 0, /* SADB_EXT_IDENTITY_SRC */ 237 0, /* SADB_EXT_IDENTITY_DST */ 238 0, /* SADB_EXT_SENSITIVITY */ 239 0, /* SADB_EXT_PROPOSAL */ 240 0, /* SADB_EXT_SUPPORTED_AUTH */ 241 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 242 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 243 0, /* SADB_X_EXT_KMPRIVATE */ 244 0, /* SADB_X_EXT_POLICY */ 245 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 246 }; 247 248 #ifdef SYSCTL_DECL 249 SYSCTL_DECL(_net_key); 250 #endif 251 252 SYSCTL_V_INT(V_NET, vnet_ipsec,_net_key, KEYCTL_DEBUG_LEVEL, debug, 253 CTLFLAG_RW, key_debug_level, 0, ""); 254 255 /* max count of trial for the decision of spi value */ 256 SYSCTL_V_INT(V_NET, vnet_ipsec,_net_key, KEYCTL_SPI_TRY, spi_trycnt, 257 CTLFLAG_RW, key_spi_trycnt, 0, ""); 258 259 /* minimum spi value to allocate automatically. */ 260 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_SPI_MIN_VALUE, 261 spi_minval, CTLFLAG_RW, key_spi_minval, 0, ""); 262 263 /* maximun spi value to allocate automatically. */ 264 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_SPI_MAX_VALUE, 265 spi_maxval, CTLFLAG_RW, key_spi_maxval, 0, ""); 266 267 /* interval to initialize randseed */ 268 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_RANDOM_INT, 269 int_random, CTLFLAG_RW, key_int_random, 0, ""); 270 271 /* lifetime for larval SA */ 272 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_LARVAL_LIFETIME, 273 larval_lifetime, CTLFLAG_RW, key_larval_lifetime, 0, ""); 274 275 /* counter for blocking to send SADB_ACQUIRE to IKEd */ 276 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_BLOCKACQ_COUNT, 277 blockacq_count, CTLFLAG_RW, key_blockacq_count, 0, ""); 278 279 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 280 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_BLOCKACQ_LIFETIME, 281 blockacq_lifetime, CTLFLAG_RW, key_blockacq_lifetime, 0, ""); 282 283 /* ESP auth */ 284 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_ESP_AUTH, esp_auth, 285 CTLFLAG_RW, ipsec_esp_auth, 0, ""); 286 287 /* minimum ESP key length */ 288 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_ESP_KEYMIN, 289 esp_keymin, CTLFLAG_RW, ipsec_esp_keymin, 0, ""); 290 291 /* minimum AH key length */ 292 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_AH_KEYMIN, ah_keymin, 293 CTLFLAG_RW, ipsec_ah_keymin, 0, ""); 294 295 /* perfered old SA rather than new SA */ 296 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_PREFERED_OLDSA, 297 preferred_oldsa, CTLFLAG_RW, key_preferred_oldsa, 0, ""); 298 299 #define __LIST_CHAINED(elm) \ 300 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 301 #define LIST_INSERT_TAIL(head, elm, type, field) \ 302 do {\ 303 struct type *curelm = LIST_FIRST(head); \ 304 if (curelm == NULL) {\ 305 LIST_INSERT_HEAD(head, elm, field); \ 306 } else { \ 307 while (LIST_NEXT(curelm, field)) \ 308 curelm = LIST_NEXT(curelm, field);\ 309 LIST_INSERT_AFTER(curelm, elm, field);\ 310 }\ 311 } while (0) 312 313 #define KEY_CHKSASTATE(head, sav, name) \ 314 do { \ 315 if ((head) != (sav)) { \ 316 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 317 (name), (head), (sav))); \ 318 continue; \ 319 } \ 320 } while (0) 321 322 #define KEY_CHKSPDIR(head, sp, name) \ 323 do { \ 324 if ((head) != (sp)) { \ 325 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 326 "anyway continue.\n", \ 327 (name), (head), (sp))); \ 328 } \ 329 } while (0) 330 331 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 332 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 333 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 334 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 335 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 336 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 337 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 338 339 /* 340 * set parameters into secpolicyindex buffer. 341 * Must allocate secpolicyindex buffer passed to this function. 342 */ 343 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 344 do { \ 345 bzero((idx), sizeof(struct secpolicyindex)); \ 346 (idx)->dir = (_dir); \ 347 (idx)->prefs = (ps); \ 348 (idx)->prefd = (pd); \ 349 (idx)->ul_proto = (ulp); \ 350 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 351 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 352 } while (0) 353 354 /* 355 * set parameters into secasindex buffer. 356 * Must allocate secasindex buffer before calling this function. 357 */ 358 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 359 do { \ 360 bzero((idx), sizeof(struct secasindex)); \ 361 (idx)->proto = (p); \ 362 (idx)->mode = (m); \ 363 (idx)->reqid = (r); \ 364 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 365 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 366 } while (0) 367 368 /* key statistics */ 369 struct _keystat { 370 u_long getspi_count; /* the avarage of count to try to get new SPI */ 371 } keystat; 372 373 struct sadb_msghdr { 374 struct sadb_msg *msg; 375 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 376 int extoff[SADB_EXT_MAX + 1]; 377 int extlen[SADB_EXT_MAX + 1]; 378 }; 379 380 static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 381 static void key_freesp_so __P((struct secpolicy **)); 382 static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 383 static void key_delsp __P((struct secpolicy *)); 384 static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 385 static void _key_delsp(struct secpolicy *sp); 386 static struct secpolicy *key_getspbyid __P((u_int32_t)); 387 static u_int32_t key_newreqid __P((void)); 388 static struct mbuf *key_gather_mbuf __P((struct mbuf *, 389 const struct sadb_msghdr *, int, int, ...)); 390 static int key_spdadd __P((struct socket *, struct mbuf *, 391 const struct sadb_msghdr *)); 392 static u_int32_t key_getnewspid __P((void)); 393 static int key_spddelete __P((struct socket *, struct mbuf *, 394 const struct sadb_msghdr *)); 395 static int key_spddelete2 __P((struct socket *, struct mbuf *, 396 const struct sadb_msghdr *)); 397 static int key_spdget __P((struct socket *, struct mbuf *, 398 const struct sadb_msghdr *)); 399 static int key_spdflush __P((struct socket *, struct mbuf *, 400 const struct sadb_msghdr *)); 401 static int key_spddump __P((struct socket *, struct mbuf *, 402 const struct sadb_msghdr *)); 403 static struct mbuf *key_setdumpsp __P((struct secpolicy *, 404 u_int8_t, u_int32_t, u_int32_t)); 405 static u_int key_getspreqmsglen __P((struct secpolicy *)); 406 static int key_spdexpire __P((struct secpolicy *)); 407 static struct secashead *key_newsah __P((struct secasindex *)); 408 static void key_delsah __P((struct secashead *)); 409 static struct secasvar *key_newsav __P((struct mbuf *, 410 const struct sadb_msghdr *, struct secashead *, int *, 411 const char*, int)); 412 #define KEY_NEWSAV(m, sadb, sah, e) \ 413 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 414 static void key_delsav __P((struct secasvar *)); 415 static struct secashead *key_getsah __P((struct secasindex *)); 416 static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 417 static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 418 static int key_setsaval __P((struct secasvar *, struct mbuf *, 419 const struct sadb_msghdr *)); 420 static int key_mature __P((struct secasvar *)); 421 static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 422 u_int8_t, u_int32_t, u_int32_t)); 423 static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 424 u_int32_t, pid_t, u_int16_t)); 425 static struct mbuf *key_setsadbsa __P((struct secasvar *)); 426 static struct mbuf *key_setsadbaddr __P((u_int16_t, 427 const struct sockaddr *, u_int8_t, u_int16_t)); 428 static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 429 static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 430 u_int32_t)); 431 static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 432 struct malloc_type *); 433 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 434 struct malloc_type *type); 435 #ifdef INET6 436 static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 437 #endif 438 439 /* flags for key_cmpsaidx() */ 440 #define CMP_HEAD 1 /* protocol, addresses. */ 441 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 442 #define CMP_REQID 3 /* additionally HEAD, reaid. */ 443 #define CMP_EXACTLY 4 /* all elements. */ 444 static int key_cmpsaidx 445 __P((const struct secasindex *, const struct secasindex *, int)); 446 447 static int key_cmpspidx_exactly 448 __P((struct secpolicyindex *, struct secpolicyindex *)); 449 static int key_cmpspidx_withmask 450 __P((struct secpolicyindex *, struct secpolicyindex *)); 451 static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 452 static int key_bbcmp __P((const void *, const void *, u_int)); 453 static u_int16_t key_satype2proto __P((u_int8_t)); 454 static u_int8_t key_proto2satype __P((u_int16_t)); 455 456 static int key_getspi __P((struct socket *, struct mbuf *, 457 const struct sadb_msghdr *)); 458 static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 459 struct secasindex *)); 460 static int key_update __P((struct socket *, struct mbuf *, 461 const struct sadb_msghdr *)); 462 #ifdef IPSEC_DOSEQCHECK 463 static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 464 #endif 465 static int key_add __P((struct socket *, struct mbuf *, 466 const struct sadb_msghdr *)); 467 static int key_setident __P((struct secashead *, struct mbuf *, 468 const struct sadb_msghdr *)); 469 static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 470 const struct sadb_msghdr *)); 471 static int key_delete __P((struct socket *, struct mbuf *, 472 const struct sadb_msghdr *)); 473 static int key_get __P((struct socket *, struct mbuf *, 474 const struct sadb_msghdr *)); 475 476 static void key_getcomb_setlifetime __P((struct sadb_comb *)); 477 static struct mbuf *key_getcomb_esp __P((void)); 478 static struct mbuf *key_getcomb_ah __P((void)); 479 static struct mbuf *key_getcomb_ipcomp __P((void)); 480 static struct mbuf *key_getprop __P((const struct secasindex *)); 481 482 static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 483 static struct secacq *key_newacq __P((const struct secasindex *)); 484 static struct secacq *key_getacq __P((const struct secasindex *)); 485 static struct secacq *key_getacqbyseq __P((u_int32_t)); 486 static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 487 static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 488 static int key_acquire2 __P((struct socket *, struct mbuf *, 489 const struct sadb_msghdr *)); 490 static int key_register __P((struct socket *, struct mbuf *, 491 const struct sadb_msghdr *)); 492 static int key_expire __P((struct secasvar *)); 493 static int key_flush __P((struct socket *, struct mbuf *, 494 const struct sadb_msghdr *)); 495 static int key_dump __P((struct socket *, struct mbuf *, 496 const struct sadb_msghdr *)); 497 static int key_promisc __P((struct socket *, struct mbuf *, 498 const struct sadb_msghdr *)); 499 static int key_senderror __P((struct socket *, struct mbuf *, int)); 500 static int key_validate_ext __P((const struct sadb_ext *, int)); 501 static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 502 static struct mbuf *key_setlifetime(struct seclifetime *src, 503 u_int16_t exttype); 504 static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 505 506 #if 0 507 static const char *key_getfqdn __P((void)); 508 static const char *key_getuserfqdn __P((void)); 509 #endif 510 static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 511 static struct mbuf *key_alloc_mbuf __P((int)); 512 513 static __inline void 514 sa_initref(struct secasvar *sav) 515 { 516 517 refcount_init(&sav->refcnt, 1); 518 } 519 static __inline void 520 sa_addref(struct secasvar *sav) 521 { 522 523 refcount_acquire(&sav->refcnt); 524 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 525 } 526 static __inline int 527 sa_delref(struct secasvar *sav) 528 { 529 530 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 531 return (refcount_release(&sav->refcnt)); 532 } 533 534 #define SP_ADDREF(p) do { \ 535 (p)->refcnt++; \ 536 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 537 } while (0) 538 #define SP_DELREF(p) do { \ 539 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 540 (p)->refcnt--; \ 541 } while (0) 542 543 544 /* 545 * Update the refcnt while holding the SPTREE lock. 546 */ 547 void 548 key_addref(struct secpolicy *sp) 549 { 550 SPTREE_LOCK(); 551 SP_ADDREF(sp); 552 SPTREE_UNLOCK(); 553 } 554 555 /* 556 * Return 0 when there are known to be no SP's for the specified 557 * direction. Otherwise return 1. This is used by IPsec code 558 * to optimize performance. 559 */ 560 int 561 key_havesp(u_int dir) 562 { 563 INIT_VNET_IPSEC(curvnet); 564 565 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 566 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 567 } 568 569 /* %%% IPsec policy management */ 570 /* 571 * allocating a SP for OUTBOUND or INBOUND packet. 572 * Must call key_freesp() later. 573 * OUT: NULL: not found 574 * others: found and return the pointer. 575 */ 576 struct secpolicy * 577 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 578 { 579 INIT_VNET_IPSEC(curvnet); 580 struct secpolicy *sp; 581 582 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 583 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 584 ("invalid direction %u", dir)); 585 586 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 587 printf("DP %s from %s:%u\n", __func__, where, tag)); 588 589 /* get a SP entry */ 590 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 591 printf("*** objects\n"); 592 kdebug_secpolicyindex(spidx)); 593 594 SPTREE_LOCK(); 595 LIST_FOREACH(sp, &V_sptree[dir], chain) { 596 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 597 printf("*** in SPD\n"); 598 kdebug_secpolicyindex(&sp->spidx)); 599 600 if (sp->state == IPSEC_SPSTATE_DEAD) 601 continue; 602 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 603 goto found; 604 } 605 sp = NULL; 606 found: 607 if (sp) { 608 /* sanity check */ 609 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 610 611 /* found a SPD entry */ 612 sp->lastused = time_second; 613 SP_ADDREF(sp); 614 } 615 SPTREE_UNLOCK(); 616 617 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 618 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 619 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 620 return sp; 621 } 622 623 /* 624 * allocating a SP for OUTBOUND or INBOUND packet. 625 * Must call key_freesp() later. 626 * OUT: NULL: not found 627 * others: found and return the pointer. 628 */ 629 struct secpolicy * 630 key_allocsp2(u_int32_t spi, 631 union sockaddr_union *dst, 632 u_int8_t proto, 633 u_int dir, 634 const char* where, int tag) 635 { 636 INIT_VNET_IPSEC(curvnet); 637 struct secpolicy *sp; 638 639 IPSEC_ASSERT(dst != NULL, ("null dst")); 640 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 641 ("invalid direction %u", dir)); 642 643 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 644 printf("DP %s from %s:%u\n", __func__, where, tag)); 645 646 /* get a SP entry */ 647 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 648 printf("*** objects\n"); 649 printf("spi %u proto %u dir %u\n", spi, proto, dir); 650 kdebug_sockaddr(&dst->sa)); 651 652 SPTREE_LOCK(); 653 LIST_FOREACH(sp, &V_sptree[dir], chain) { 654 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 655 printf("*** in SPD\n"); 656 kdebug_secpolicyindex(&sp->spidx)); 657 658 if (sp->state == IPSEC_SPSTATE_DEAD) 659 continue; 660 /* compare simple values, then dst address */ 661 if (sp->spidx.ul_proto != proto) 662 continue; 663 /* NB: spi's must exist and match */ 664 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 665 continue; 666 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 667 goto found; 668 } 669 sp = NULL; 670 found: 671 if (sp) { 672 /* sanity check */ 673 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 674 675 /* found a SPD entry */ 676 sp->lastused = time_second; 677 SP_ADDREF(sp); 678 } 679 SPTREE_UNLOCK(); 680 681 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 682 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 683 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 684 return sp; 685 } 686 687 #if 0 688 /* 689 * return a policy that matches this particular inbound packet. 690 * XXX slow 691 */ 692 struct secpolicy * 693 key_gettunnel(const struct sockaddr *osrc, 694 const struct sockaddr *odst, 695 const struct sockaddr *isrc, 696 const struct sockaddr *idst, 697 const char* where, int tag) 698 { 699 INIT_VNET_IPSEC(curvnet); 700 struct secpolicy *sp; 701 const int dir = IPSEC_DIR_INBOUND; 702 struct ipsecrequest *r1, *r2, *p; 703 struct secpolicyindex spidx; 704 705 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 706 printf("DP %s from %s:%u\n", __func__, where, tag)); 707 708 if (isrc->sa_family != idst->sa_family) { 709 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 710 __func__, isrc->sa_family, idst->sa_family)); 711 sp = NULL; 712 goto done; 713 } 714 715 SPTREE_LOCK(); 716 LIST_FOREACH(sp, &V_sptree[dir], chain) { 717 if (sp->state == IPSEC_SPSTATE_DEAD) 718 continue; 719 720 r1 = r2 = NULL; 721 for (p = sp->req; p; p = p->next) { 722 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 723 continue; 724 725 r1 = r2; 726 r2 = p; 727 728 if (!r1) { 729 /* here we look at address matches only */ 730 spidx = sp->spidx; 731 if (isrc->sa_len > sizeof(spidx.src) || 732 idst->sa_len > sizeof(spidx.dst)) 733 continue; 734 bcopy(isrc, &spidx.src, isrc->sa_len); 735 bcopy(idst, &spidx.dst, idst->sa_len); 736 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 737 continue; 738 } else { 739 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 740 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 741 continue; 742 } 743 744 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 745 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 746 continue; 747 748 goto found; 749 } 750 } 751 sp = NULL; 752 found: 753 if (sp) { 754 sp->lastused = time_second; 755 SP_ADDREF(sp); 756 } 757 SPTREE_UNLOCK(); 758 done: 759 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 760 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 761 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 762 return sp; 763 } 764 #endif 765 766 /* 767 * allocating an SA entry for an *OUTBOUND* packet. 768 * checking each request entries in SP, and acquire an SA if need. 769 * OUT: 0: there are valid requests. 770 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 771 */ 772 int 773 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 774 { 775 INIT_VNET_IPSEC(curvnet); 776 u_int level; 777 int error; 778 779 IPSEC_ASSERT(isr != NULL, ("null isr")); 780 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 781 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 782 saidx->mode == IPSEC_MODE_TUNNEL, 783 ("unexpected policy %u", saidx->mode)); 784 785 /* 786 * XXX guard against protocol callbacks from the crypto 787 * thread as they reference ipsecrequest.sav which we 788 * temporarily null out below. Need to rethink how we 789 * handle bundled SA's in the callback thread. 790 */ 791 IPSECREQUEST_LOCK_ASSERT(isr); 792 793 /* get current level */ 794 level = ipsec_get_reqlevel(isr); 795 #if 0 796 /* 797 * We do allocate new SA only if the state of SA in the holder is 798 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 799 */ 800 if (isr->sav != NULL) { 801 if (isr->sav->sah == NULL) 802 panic("%s: sah is null.\n", __func__); 803 if (isr->sav == (struct secasvar *)LIST_FIRST( 804 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 805 KEY_FREESAV(&isr->sav); 806 isr->sav = NULL; 807 } 808 } 809 #else 810 /* 811 * we free any SA stashed in the IPsec request because a different 812 * SA may be involved each time this request is checked, either 813 * because new SAs are being configured, or this request is 814 * associated with an unconnected datagram socket, or this request 815 * is associated with a system default policy. 816 * 817 * The operation may have negative impact to performance. We may 818 * want to check cached SA carefully, rather than picking new SA 819 * every time. 820 */ 821 if (isr->sav != NULL) { 822 KEY_FREESAV(&isr->sav); 823 isr->sav = NULL; 824 } 825 #endif 826 827 /* 828 * new SA allocation if no SA found. 829 * key_allocsa_policy should allocate the oldest SA available. 830 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 831 */ 832 if (isr->sav == NULL) 833 isr->sav = key_allocsa_policy(saidx); 834 835 /* When there is SA. */ 836 if (isr->sav != NULL) { 837 if (isr->sav->state != SADB_SASTATE_MATURE && 838 isr->sav->state != SADB_SASTATE_DYING) 839 return EINVAL; 840 return 0; 841 } 842 843 /* there is no SA */ 844 error = key_acquire(saidx, isr->sp); 845 if (error != 0) { 846 /* XXX What should I do ? */ 847 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 848 __func__, error)); 849 return error; 850 } 851 852 if (level != IPSEC_LEVEL_REQUIRE) { 853 /* XXX sigh, the interface to this routine is botched */ 854 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 855 return 0; 856 } else { 857 return ENOENT; 858 } 859 } 860 861 /* 862 * allocating a SA for policy entry from SAD. 863 * NOTE: searching SAD of aliving state. 864 * OUT: NULL: not found. 865 * others: found and return the pointer. 866 */ 867 static struct secasvar * 868 key_allocsa_policy(const struct secasindex *saidx) 869 { 870 #define N(a) _ARRAYLEN(a) 871 INIT_VNET_IPSEC(curvnet); 872 struct secashead *sah; 873 struct secasvar *sav; 874 u_int stateidx, arraysize; 875 const u_int *state_valid; 876 877 SAHTREE_LOCK(); 878 LIST_FOREACH(sah, &V_sahtree, chain) { 879 if (sah->state == SADB_SASTATE_DEAD) 880 continue; 881 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 882 if (V_key_preferred_oldsa) { 883 state_valid = saorder_state_valid_prefer_old; 884 arraysize = N(saorder_state_valid_prefer_old); 885 } else { 886 state_valid = saorder_state_valid_prefer_new; 887 arraysize = N(saorder_state_valid_prefer_new); 888 } 889 SAHTREE_UNLOCK(); 890 goto found; 891 } 892 } 893 SAHTREE_UNLOCK(); 894 895 return NULL; 896 897 found: 898 /* search valid state */ 899 for (stateidx = 0; stateidx < arraysize; stateidx++) { 900 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 901 if (sav != NULL) 902 return sav; 903 } 904 905 return NULL; 906 #undef N 907 } 908 909 /* 910 * searching SAD with direction, protocol, mode and state. 911 * called by key_allocsa_policy(). 912 * OUT: 913 * NULL : not found 914 * others : found, pointer to a SA. 915 */ 916 static struct secasvar * 917 key_do_allocsa_policy(struct secashead *sah, u_int state) 918 { 919 INIT_VNET_IPSEC(curvnet); 920 struct secasvar *sav, *nextsav, *candidate, *d; 921 922 /* initilize */ 923 candidate = NULL; 924 925 SAHTREE_LOCK(); 926 for (sav = LIST_FIRST(&sah->savtree[state]); 927 sav != NULL; 928 sav = nextsav) { 929 930 nextsav = LIST_NEXT(sav, chain); 931 932 /* sanity check */ 933 KEY_CHKSASTATE(sav->state, state, __func__); 934 935 /* initialize */ 936 if (candidate == NULL) { 937 candidate = sav; 938 continue; 939 } 940 941 /* Which SA is the better ? */ 942 943 IPSEC_ASSERT(candidate->lft_c != NULL, 944 ("null candidate lifetime")); 945 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 946 947 /* What the best method is to compare ? */ 948 if (V_key_preferred_oldsa) { 949 if (candidate->lft_c->addtime > 950 sav->lft_c->addtime) { 951 candidate = sav; 952 } 953 continue; 954 /*NOTREACHED*/ 955 } 956 957 /* preferred new sa rather than old sa */ 958 if (candidate->lft_c->addtime < 959 sav->lft_c->addtime) { 960 d = candidate; 961 candidate = sav; 962 } else 963 d = sav; 964 965 /* 966 * prepared to delete the SA when there is more 967 * suitable candidate and the lifetime of the SA is not 968 * permanent. 969 */ 970 if (d->lft_h->addtime != 0) { 971 struct mbuf *m, *result; 972 u_int8_t satype; 973 974 key_sa_chgstate(d, SADB_SASTATE_DEAD); 975 976 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 977 978 satype = key_proto2satype(d->sah->saidx.proto); 979 if (satype == 0) 980 goto msgfail; 981 982 m = key_setsadbmsg(SADB_DELETE, 0, 983 satype, 0, 0, d->refcnt - 1); 984 if (!m) 985 goto msgfail; 986 result = m; 987 988 /* set sadb_address for saidx's. */ 989 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 990 &d->sah->saidx.src.sa, 991 d->sah->saidx.src.sa.sa_len << 3, 992 IPSEC_ULPROTO_ANY); 993 if (!m) 994 goto msgfail; 995 m_cat(result, m); 996 997 /* set sadb_address for saidx's. */ 998 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 999 &d->sah->saidx.dst.sa, 1000 d->sah->saidx.dst.sa.sa_len << 3, 1001 IPSEC_ULPROTO_ANY); 1002 if (!m) 1003 goto msgfail; 1004 m_cat(result, m); 1005 1006 /* create SA extension */ 1007 m = key_setsadbsa(d); 1008 if (!m) 1009 goto msgfail; 1010 m_cat(result, m); 1011 1012 if (result->m_len < sizeof(struct sadb_msg)) { 1013 result = m_pullup(result, 1014 sizeof(struct sadb_msg)); 1015 if (result == NULL) 1016 goto msgfail; 1017 } 1018 1019 result->m_pkthdr.len = 0; 1020 for (m = result; m; m = m->m_next) 1021 result->m_pkthdr.len += m->m_len; 1022 mtod(result, struct sadb_msg *)->sadb_msg_len = 1023 PFKEY_UNIT64(result->m_pkthdr.len); 1024 1025 if (key_sendup_mbuf(NULL, result, 1026 KEY_SENDUP_REGISTERED)) 1027 goto msgfail; 1028 msgfail: 1029 KEY_FREESAV(&d); 1030 } 1031 } 1032 if (candidate) { 1033 sa_addref(candidate); 1034 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1035 printf("DP %s cause refcnt++:%d SA:%p\n", 1036 __func__, candidate->refcnt, candidate)); 1037 } 1038 SAHTREE_UNLOCK(); 1039 1040 return candidate; 1041 } 1042 1043 /* 1044 * allocating a usable SA entry for a *INBOUND* packet. 1045 * Must call key_freesav() later. 1046 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1047 * NULL: not found, or error occured. 1048 * 1049 * In the comparison, no source address is used--for RFC2401 conformance. 1050 * To quote, from section 4.1: 1051 * A security association is uniquely identified by a triple consisting 1052 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1053 * security protocol (AH or ESP) identifier. 1054 * Note that, however, we do need to keep source address in IPsec SA. 1055 * IKE specification and PF_KEY specification do assume that we 1056 * keep source address in IPsec SA. We see a tricky situation here. 1057 */ 1058 struct secasvar * 1059 key_allocsa( 1060 union sockaddr_union *dst, 1061 u_int proto, 1062 u_int32_t spi, 1063 const char* where, int tag) 1064 { 1065 INIT_VNET_IPSEC(curvnet); 1066 struct secashead *sah; 1067 struct secasvar *sav; 1068 u_int stateidx, arraysize, state; 1069 const u_int *saorder_state_valid; 1070 1071 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1072 1073 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1074 printf("DP %s from %s:%u\n", __func__, where, tag)); 1075 1076 /* 1077 * searching SAD. 1078 * XXX: to be checked internal IP header somewhere. Also when 1079 * IPsec tunnel packet is received. But ESP tunnel mode is 1080 * encrypted so we can't check internal IP header. 1081 */ 1082 SAHTREE_LOCK(); 1083 if (V_key_preferred_oldsa) { 1084 saorder_state_valid = saorder_state_valid_prefer_old; 1085 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1086 } else { 1087 saorder_state_valid = saorder_state_valid_prefer_new; 1088 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1089 } 1090 LIST_FOREACH(sah, &V_sahtree, chain) { 1091 /* search valid state */ 1092 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1093 state = saorder_state_valid[stateidx]; 1094 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1095 /* sanity check */ 1096 KEY_CHKSASTATE(sav->state, state, __func__); 1097 /* do not return entries w/ unusable state */ 1098 if (sav->state != SADB_SASTATE_MATURE && 1099 sav->state != SADB_SASTATE_DYING) 1100 continue; 1101 if (proto != sav->sah->saidx.proto) 1102 continue; 1103 if (spi != sav->spi) 1104 continue; 1105 #if 0 /* don't check src */ 1106 /* check src address */ 1107 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) 1108 continue; 1109 #endif 1110 /* check dst address */ 1111 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0) 1112 continue; 1113 sa_addref(sav); 1114 goto done; 1115 } 1116 } 1117 } 1118 sav = NULL; 1119 done: 1120 SAHTREE_UNLOCK(); 1121 1122 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1123 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1124 sav, sav ? sav->refcnt : 0)); 1125 return sav; 1126 } 1127 1128 /* 1129 * Must be called after calling key_allocsp(). 1130 * For both the packet without socket and key_freeso(). 1131 */ 1132 void 1133 _key_freesp(struct secpolicy **spp, const char* where, int tag) 1134 { 1135 INIT_VNET_IPSEC(curvnet); 1136 struct secpolicy *sp = *spp; 1137 1138 IPSEC_ASSERT(sp != NULL, ("null sp")); 1139 1140 SPTREE_LOCK(); 1141 SP_DELREF(sp); 1142 1143 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1144 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1145 __func__, sp, sp->id, where, tag, sp->refcnt)); 1146 1147 if (sp->refcnt == 0) { 1148 *spp = NULL; 1149 key_delsp(sp); 1150 } 1151 SPTREE_UNLOCK(); 1152 } 1153 1154 /* 1155 * Must be called after calling key_allocsp(). 1156 * For the packet with socket. 1157 */ 1158 void 1159 key_freeso(struct socket *so) 1160 { 1161 INIT_VNET_IPSEC(curvnet); 1162 IPSEC_ASSERT(so != NULL, ("null so")); 1163 1164 switch (so->so_proto->pr_domain->dom_family) { 1165 #if defined(INET) || defined(INET6) 1166 #ifdef INET 1167 case PF_INET: 1168 #endif 1169 #ifdef INET6 1170 case PF_INET6: 1171 #endif 1172 { 1173 struct inpcb *pcb = sotoinpcb(so); 1174 1175 /* Does it have a PCB ? */ 1176 if (pcb == NULL) 1177 return; 1178 key_freesp_so(&pcb->inp_sp->sp_in); 1179 key_freesp_so(&pcb->inp_sp->sp_out); 1180 } 1181 break; 1182 #endif /* INET || INET6 */ 1183 default: 1184 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1185 __func__, so->so_proto->pr_domain->dom_family)); 1186 return; 1187 } 1188 } 1189 1190 static void 1191 key_freesp_so(struct secpolicy **sp) 1192 { 1193 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1194 1195 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1196 (*sp)->policy == IPSEC_POLICY_BYPASS) 1197 return; 1198 1199 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1200 ("invalid policy %u", (*sp)->policy)); 1201 KEY_FREESP(sp); 1202 } 1203 1204 /* 1205 * Must be called after calling key_allocsa(). 1206 * This function is called by key_freesp() to free some SA allocated 1207 * for a policy. 1208 */ 1209 void 1210 key_freesav(struct secasvar **psav, const char* where, int tag) 1211 { 1212 INIT_VNET_IPSEC(curvnet); 1213 struct secasvar *sav = *psav; 1214 1215 IPSEC_ASSERT(sav != NULL, ("null sav")); 1216 1217 if (sa_delref(sav)) { 1218 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1219 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1220 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1221 *psav = NULL; 1222 key_delsav(sav); 1223 } else { 1224 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1225 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1226 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1227 } 1228 } 1229 1230 /* %%% SPD management */ 1231 /* 1232 * free security policy entry. 1233 */ 1234 static void 1235 key_delsp(struct secpolicy *sp) 1236 { 1237 struct ipsecrequest *isr, *nextisr; 1238 1239 IPSEC_ASSERT(sp != NULL, ("null sp")); 1240 SPTREE_LOCK_ASSERT(); 1241 1242 sp->state = IPSEC_SPSTATE_DEAD; 1243 1244 IPSEC_ASSERT(sp->refcnt == 0, 1245 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1246 1247 /* remove from SP index */ 1248 if (__LIST_CHAINED(sp)) 1249 LIST_REMOVE(sp, chain); 1250 1251 for (isr = sp->req; isr != NULL; isr = nextisr) { 1252 if (isr->sav != NULL) { 1253 KEY_FREESAV(&isr->sav); 1254 isr->sav = NULL; 1255 } 1256 1257 nextisr = isr->next; 1258 ipsec_delisr(isr); 1259 } 1260 _key_delsp(sp); 1261 } 1262 1263 /* 1264 * search SPD 1265 * OUT: NULL : not found 1266 * others : found, pointer to a SP. 1267 */ 1268 static struct secpolicy * 1269 key_getsp(struct secpolicyindex *spidx) 1270 { 1271 INIT_VNET_IPSEC(curvnet); 1272 struct secpolicy *sp; 1273 1274 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1275 1276 SPTREE_LOCK(); 1277 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1278 if (sp->state == IPSEC_SPSTATE_DEAD) 1279 continue; 1280 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1281 SP_ADDREF(sp); 1282 break; 1283 } 1284 } 1285 SPTREE_UNLOCK(); 1286 1287 return sp; 1288 } 1289 1290 /* 1291 * get SP by index. 1292 * OUT: NULL : not found 1293 * others : found, pointer to a SP. 1294 */ 1295 static struct secpolicy * 1296 key_getspbyid(u_int32_t id) 1297 { 1298 INIT_VNET_IPSEC(curvnet); 1299 struct secpolicy *sp; 1300 1301 SPTREE_LOCK(); 1302 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1303 if (sp->state == IPSEC_SPSTATE_DEAD) 1304 continue; 1305 if (sp->id == id) { 1306 SP_ADDREF(sp); 1307 goto done; 1308 } 1309 } 1310 1311 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1312 if (sp->state == IPSEC_SPSTATE_DEAD) 1313 continue; 1314 if (sp->id == id) { 1315 SP_ADDREF(sp); 1316 goto done; 1317 } 1318 } 1319 done: 1320 SPTREE_UNLOCK(); 1321 1322 return sp; 1323 } 1324 1325 struct secpolicy * 1326 key_newsp(const char* where, int tag) 1327 { 1328 INIT_VNET_IPSEC(curvnet); 1329 struct secpolicy *newsp = NULL; 1330 1331 newsp = (struct secpolicy *) 1332 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1333 if (newsp) { 1334 SECPOLICY_LOCK_INIT(newsp); 1335 newsp->refcnt = 1; 1336 newsp->req = NULL; 1337 } 1338 1339 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1340 printf("DP %s from %s:%u return SP:%p\n", __func__, 1341 where, tag, newsp)); 1342 return newsp; 1343 } 1344 1345 static void 1346 _key_delsp(struct secpolicy *sp) 1347 { 1348 SECPOLICY_LOCK_DESTROY(sp); 1349 free(sp, M_IPSEC_SP); 1350 } 1351 1352 /* 1353 * create secpolicy structure from sadb_x_policy structure. 1354 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1355 * so must be set properly later. 1356 */ 1357 struct secpolicy * 1358 key_msg2sp(xpl0, len, error) 1359 struct sadb_x_policy *xpl0; 1360 size_t len; 1361 int *error; 1362 { 1363 INIT_VNET_IPSEC(curvnet); 1364 struct secpolicy *newsp; 1365 1366 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1367 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1368 1369 if (len != PFKEY_EXTLEN(xpl0)) { 1370 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1371 *error = EINVAL; 1372 return NULL; 1373 } 1374 1375 if ((newsp = KEY_NEWSP()) == NULL) { 1376 *error = ENOBUFS; 1377 return NULL; 1378 } 1379 1380 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1381 newsp->policy = xpl0->sadb_x_policy_type; 1382 1383 /* check policy */ 1384 switch (xpl0->sadb_x_policy_type) { 1385 case IPSEC_POLICY_DISCARD: 1386 case IPSEC_POLICY_NONE: 1387 case IPSEC_POLICY_ENTRUST: 1388 case IPSEC_POLICY_BYPASS: 1389 newsp->req = NULL; 1390 break; 1391 1392 case IPSEC_POLICY_IPSEC: 1393 { 1394 int tlen; 1395 struct sadb_x_ipsecrequest *xisr; 1396 struct ipsecrequest **p_isr = &newsp->req; 1397 1398 /* validity check */ 1399 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1400 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1401 __func__)); 1402 KEY_FREESP(&newsp); 1403 *error = EINVAL; 1404 return NULL; 1405 } 1406 1407 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1408 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1409 1410 while (tlen > 0) { 1411 /* length check */ 1412 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1413 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1414 "length.\n", __func__)); 1415 KEY_FREESP(&newsp); 1416 *error = EINVAL; 1417 return NULL; 1418 } 1419 1420 /* allocate request buffer */ 1421 /* NB: data structure is zero'd */ 1422 *p_isr = ipsec_newisr(); 1423 if ((*p_isr) == NULL) { 1424 ipseclog((LOG_DEBUG, 1425 "%s: No more memory.\n", __func__)); 1426 KEY_FREESP(&newsp); 1427 *error = ENOBUFS; 1428 return NULL; 1429 } 1430 1431 /* set values */ 1432 switch (xisr->sadb_x_ipsecrequest_proto) { 1433 case IPPROTO_ESP: 1434 case IPPROTO_AH: 1435 case IPPROTO_IPCOMP: 1436 break; 1437 default: 1438 ipseclog((LOG_DEBUG, 1439 "%s: invalid proto type=%u\n", __func__, 1440 xisr->sadb_x_ipsecrequest_proto)); 1441 KEY_FREESP(&newsp); 1442 *error = EPROTONOSUPPORT; 1443 return NULL; 1444 } 1445 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1446 1447 switch (xisr->sadb_x_ipsecrequest_mode) { 1448 case IPSEC_MODE_TRANSPORT: 1449 case IPSEC_MODE_TUNNEL: 1450 break; 1451 case IPSEC_MODE_ANY: 1452 default: 1453 ipseclog((LOG_DEBUG, 1454 "%s: invalid mode=%u\n", __func__, 1455 xisr->sadb_x_ipsecrequest_mode)); 1456 KEY_FREESP(&newsp); 1457 *error = EINVAL; 1458 return NULL; 1459 } 1460 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1461 1462 switch (xisr->sadb_x_ipsecrequest_level) { 1463 case IPSEC_LEVEL_DEFAULT: 1464 case IPSEC_LEVEL_USE: 1465 case IPSEC_LEVEL_REQUIRE: 1466 break; 1467 case IPSEC_LEVEL_UNIQUE: 1468 /* validity check */ 1469 /* 1470 * If range violation of reqid, kernel will 1471 * update it, don't refuse it. 1472 */ 1473 if (xisr->sadb_x_ipsecrequest_reqid 1474 > IPSEC_MANUAL_REQID_MAX) { 1475 ipseclog((LOG_DEBUG, 1476 "%s: reqid=%d range " 1477 "violation, updated by kernel.\n", 1478 __func__, 1479 xisr->sadb_x_ipsecrequest_reqid)); 1480 xisr->sadb_x_ipsecrequest_reqid = 0; 1481 } 1482 1483 /* allocate new reqid id if reqid is zero. */ 1484 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1485 u_int32_t reqid; 1486 if ((reqid = key_newreqid()) == 0) { 1487 KEY_FREESP(&newsp); 1488 *error = ENOBUFS; 1489 return NULL; 1490 } 1491 (*p_isr)->saidx.reqid = reqid; 1492 xisr->sadb_x_ipsecrequest_reqid = reqid; 1493 } else { 1494 /* set it for manual keying. */ 1495 (*p_isr)->saidx.reqid = 1496 xisr->sadb_x_ipsecrequest_reqid; 1497 } 1498 break; 1499 1500 default: 1501 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1502 __func__, 1503 xisr->sadb_x_ipsecrequest_level)); 1504 KEY_FREESP(&newsp); 1505 *error = EINVAL; 1506 return NULL; 1507 } 1508 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1509 1510 /* set IP addresses if there */ 1511 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1512 struct sockaddr *paddr; 1513 1514 paddr = (struct sockaddr *)(xisr + 1); 1515 1516 /* validity check */ 1517 if (paddr->sa_len 1518 > sizeof((*p_isr)->saidx.src)) { 1519 ipseclog((LOG_DEBUG, "%s: invalid " 1520 "request address length.\n", 1521 __func__)); 1522 KEY_FREESP(&newsp); 1523 *error = EINVAL; 1524 return NULL; 1525 } 1526 bcopy(paddr, &(*p_isr)->saidx.src, 1527 paddr->sa_len); 1528 1529 paddr = (struct sockaddr *)((caddr_t)paddr 1530 + paddr->sa_len); 1531 1532 /* validity check */ 1533 if (paddr->sa_len 1534 > sizeof((*p_isr)->saidx.dst)) { 1535 ipseclog((LOG_DEBUG, "%s: invalid " 1536 "request address length.\n", 1537 __func__)); 1538 KEY_FREESP(&newsp); 1539 *error = EINVAL; 1540 return NULL; 1541 } 1542 bcopy(paddr, &(*p_isr)->saidx.dst, 1543 paddr->sa_len); 1544 } 1545 1546 (*p_isr)->sp = newsp; 1547 1548 /* initialization for the next. */ 1549 p_isr = &(*p_isr)->next; 1550 tlen -= xisr->sadb_x_ipsecrequest_len; 1551 1552 /* validity check */ 1553 if (tlen < 0) { 1554 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1555 __func__)); 1556 KEY_FREESP(&newsp); 1557 *error = EINVAL; 1558 return NULL; 1559 } 1560 1561 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1562 + xisr->sadb_x_ipsecrequest_len); 1563 } 1564 } 1565 break; 1566 default: 1567 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1568 KEY_FREESP(&newsp); 1569 *error = EINVAL; 1570 return NULL; 1571 } 1572 1573 *error = 0; 1574 return newsp; 1575 } 1576 1577 static u_int32_t 1578 key_newreqid() 1579 { 1580 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1581 1582 auto_reqid = (auto_reqid == ~0 1583 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1584 1585 /* XXX should be unique check */ 1586 1587 return auto_reqid; 1588 } 1589 1590 /* 1591 * copy secpolicy struct to sadb_x_policy structure indicated. 1592 */ 1593 struct mbuf * 1594 key_sp2msg(sp) 1595 struct secpolicy *sp; 1596 { 1597 struct sadb_x_policy *xpl; 1598 int tlen; 1599 caddr_t p; 1600 struct mbuf *m; 1601 1602 IPSEC_ASSERT(sp != NULL, ("null policy")); 1603 1604 tlen = key_getspreqmsglen(sp); 1605 1606 m = key_alloc_mbuf(tlen); 1607 if (!m || m->m_next) { /*XXX*/ 1608 if (m) 1609 m_freem(m); 1610 return NULL; 1611 } 1612 1613 m->m_len = tlen; 1614 m->m_next = NULL; 1615 xpl = mtod(m, struct sadb_x_policy *); 1616 bzero(xpl, tlen); 1617 1618 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1619 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1620 xpl->sadb_x_policy_type = sp->policy; 1621 xpl->sadb_x_policy_dir = sp->spidx.dir; 1622 xpl->sadb_x_policy_id = sp->id; 1623 p = (caddr_t)xpl + sizeof(*xpl); 1624 1625 /* if is the policy for ipsec ? */ 1626 if (sp->policy == IPSEC_POLICY_IPSEC) { 1627 struct sadb_x_ipsecrequest *xisr; 1628 struct ipsecrequest *isr; 1629 1630 for (isr = sp->req; isr != NULL; isr = isr->next) { 1631 1632 xisr = (struct sadb_x_ipsecrequest *)p; 1633 1634 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1635 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1636 xisr->sadb_x_ipsecrequest_level = isr->level; 1637 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1638 1639 p += sizeof(*xisr); 1640 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1641 p += isr->saidx.src.sa.sa_len; 1642 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1643 p += isr->saidx.src.sa.sa_len; 1644 1645 xisr->sadb_x_ipsecrequest_len = 1646 PFKEY_ALIGN8(sizeof(*xisr) 1647 + isr->saidx.src.sa.sa_len 1648 + isr->saidx.dst.sa.sa_len); 1649 } 1650 } 1651 1652 return m; 1653 } 1654 1655 /* m will not be freed nor modified */ 1656 static struct mbuf * 1657 #ifdef __STDC__ 1658 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1659 int ndeep, int nitem, ...) 1660 #else 1661 key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1662 struct mbuf *m; 1663 const struct sadb_msghdr *mhp; 1664 int ndeep; 1665 int nitem; 1666 va_dcl 1667 #endif 1668 { 1669 va_list ap; 1670 int idx; 1671 int i; 1672 struct mbuf *result = NULL, *n; 1673 int len; 1674 1675 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1676 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1677 1678 va_start(ap, nitem); 1679 for (i = 0; i < nitem; i++) { 1680 idx = va_arg(ap, int); 1681 if (idx < 0 || idx > SADB_EXT_MAX) 1682 goto fail; 1683 /* don't attempt to pull empty extension */ 1684 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1685 continue; 1686 if (idx != SADB_EXT_RESERVED && 1687 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1688 continue; 1689 1690 if (idx == SADB_EXT_RESERVED) { 1691 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1692 1693 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1694 1695 MGETHDR(n, M_DONTWAIT, MT_DATA); 1696 if (!n) 1697 goto fail; 1698 n->m_len = len; 1699 n->m_next = NULL; 1700 m_copydata(m, 0, sizeof(struct sadb_msg), 1701 mtod(n, caddr_t)); 1702 } else if (i < ndeep) { 1703 len = mhp->extlen[idx]; 1704 n = key_alloc_mbuf(len); 1705 if (!n || n->m_next) { /*XXX*/ 1706 if (n) 1707 m_freem(n); 1708 goto fail; 1709 } 1710 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1711 mtod(n, caddr_t)); 1712 } else { 1713 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1714 M_DONTWAIT); 1715 } 1716 if (n == NULL) 1717 goto fail; 1718 1719 if (result) 1720 m_cat(result, n); 1721 else 1722 result = n; 1723 } 1724 va_end(ap); 1725 1726 if ((result->m_flags & M_PKTHDR) != 0) { 1727 result->m_pkthdr.len = 0; 1728 for (n = result; n; n = n->m_next) 1729 result->m_pkthdr.len += n->m_len; 1730 } 1731 1732 return result; 1733 1734 fail: 1735 m_freem(result); 1736 return NULL; 1737 } 1738 1739 /* 1740 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1741 * add an entry to SP database, when received 1742 * <base, address(SD), (lifetime(H),) policy> 1743 * from the user(?). 1744 * Adding to SP database, 1745 * and send 1746 * <base, address(SD), (lifetime(H),) policy> 1747 * to the socket which was send. 1748 * 1749 * SPDADD set a unique policy entry. 1750 * SPDSETIDX like SPDADD without a part of policy requests. 1751 * SPDUPDATE replace a unique policy entry. 1752 * 1753 * m will always be freed. 1754 */ 1755 static int 1756 key_spdadd(so, m, mhp) 1757 struct socket *so; 1758 struct mbuf *m; 1759 const struct sadb_msghdr *mhp; 1760 { 1761 INIT_VNET_IPSEC(curvnet); 1762 struct sadb_address *src0, *dst0; 1763 struct sadb_x_policy *xpl0, *xpl; 1764 struct sadb_lifetime *lft = NULL; 1765 struct secpolicyindex spidx; 1766 struct secpolicy *newsp; 1767 int error; 1768 1769 IPSEC_ASSERT(so != NULL, ("null socket")); 1770 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1771 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1772 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1773 1774 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1775 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1776 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1777 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1778 return key_senderror(so, m, EINVAL); 1779 } 1780 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1781 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1782 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1783 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1784 __func__)); 1785 return key_senderror(so, m, EINVAL); 1786 } 1787 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1788 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1789 < sizeof(struct sadb_lifetime)) { 1790 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1791 __func__)); 1792 return key_senderror(so, m, EINVAL); 1793 } 1794 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1795 } 1796 1797 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1798 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1799 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1800 1801 /* make secindex */ 1802 /* XXX boundary check against sa_len */ 1803 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1804 src0 + 1, 1805 dst0 + 1, 1806 src0->sadb_address_prefixlen, 1807 dst0->sadb_address_prefixlen, 1808 src0->sadb_address_proto, 1809 &spidx); 1810 1811 /* checking the direciton. */ 1812 switch (xpl0->sadb_x_policy_dir) { 1813 case IPSEC_DIR_INBOUND: 1814 case IPSEC_DIR_OUTBOUND: 1815 break; 1816 default: 1817 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1818 mhp->msg->sadb_msg_errno = EINVAL; 1819 return 0; 1820 } 1821 1822 /* check policy */ 1823 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1824 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1825 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1826 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1827 return key_senderror(so, m, EINVAL); 1828 } 1829 1830 /* policy requests are mandatory when action is ipsec. */ 1831 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1832 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1833 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1834 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1835 __func__)); 1836 return key_senderror(so, m, EINVAL); 1837 } 1838 1839 /* 1840 * checking there is SP already or not. 1841 * SPDUPDATE doesn't depend on whether there is a SP or not. 1842 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1843 * then error. 1844 */ 1845 newsp = key_getsp(&spidx); 1846 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1847 if (newsp) { 1848 newsp->state = IPSEC_SPSTATE_DEAD; 1849 KEY_FREESP(&newsp); 1850 } 1851 } else { 1852 if (newsp != NULL) { 1853 KEY_FREESP(&newsp); 1854 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1855 __func__)); 1856 return key_senderror(so, m, EEXIST); 1857 } 1858 } 1859 1860 /* allocation new SP entry */ 1861 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1862 return key_senderror(so, m, error); 1863 } 1864 1865 if ((newsp->id = key_getnewspid()) == 0) { 1866 _key_delsp(newsp); 1867 return key_senderror(so, m, ENOBUFS); 1868 } 1869 1870 /* XXX boundary check against sa_len */ 1871 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1872 src0 + 1, 1873 dst0 + 1, 1874 src0->sadb_address_prefixlen, 1875 dst0->sadb_address_prefixlen, 1876 src0->sadb_address_proto, 1877 &newsp->spidx); 1878 1879 /* sanity check on addr pair */ 1880 if (((struct sockaddr *)(src0 + 1))->sa_family != 1881 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1882 _key_delsp(newsp); 1883 return key_senderror(so, m, EINVAL); 1884 } 1885 if (((struct sockaddr *)(src0 + 1))->sa_len != 1886 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1887 _key_delsp(newsp); 1888 return key_senderror(so, m, EINVAL); 1889 } 1890 #if 1 1891 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1892 struct sockaddr *sa; 1893 sa = (struct sockaddr *)(src0 + 1); 1894 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1895 _key_delsp(newsp); 1896 return key_senderror(so, m, EINVAL); 1897 } 1898 } 1899 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1900 struct sockaddr *sa; 1901 sa = (struct sockaddr *)(dst0 + 1); 1902 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1903 _key_delsp(newsp); 1904 return key_senderror(so, m, EINVAL); 1905 } 1906 } 1907 #endif 1908 1909 newsp->created = time_second; 1910 newsp->lastused = newsp->created; 1911 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1912 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1913 1914 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1915 newsp->state = IPSEC_SPSTATE_ALIVE; 1916 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1917 1918 /* delete the entry in spacqtree */ 1919 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1920 struct secspacq *spacq = key_getspacq(&spidx); 1921 if (spacq != NULL) { 1922 /* reset counter in order to deletion by timehandler. */ 1923 spacq->created = time_second; 1924 spacq->count = 0; 1925 SPACQ_UNLOCK(); 1926 } 1927 } 1928 1929 { 1930 struct mbuf *n, *mpolicy; 1931 struct sadb_msg *newmsg; 1932 int off; 1933 1934 /* create new sadb_msg to reply. */ 1935 if (lft) { 1936 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1937 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1938 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1939 } else { 1940 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1941 SADB_X_EXT_POLICY, 1942 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1943 } 1944 if (!n) 1945 return key_senderror(so, m, ENOBUFS); 1946 1947 if (n->m_len < sizeof(*newmsg)) { 1948 n = m_pullup(n, sizeof(*newmsg)); 1949 if (!n) 1950 return key_senderror(so, m, ENOBUFS); 1951 } 1952 newmsg = mtod(n, struct sadb_msg *); 1953 newmsg->sadb_msg_errno = 0; 1954 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1955 1956 off = 0; 1957 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1958 sizeof(*xpl), &off); 1959 if (mpolicy == NULL) { 1960 /* n is already freed */ 1961 return key_senderror(so, m, ENOBUFS); 1962 } 1963 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1964 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1965 m_freem(n); 1966 return key_senderror(so, m, EINVAL); 1967 } 1968 xpl->sadb_x_policy_id = newsp->id; 1969 1970 m_freem(m); 1971 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1972 } 1973 } 1974 1975 /* 1976 * get new policy id. 1977 * OUT: 1978 * 0: failure. 1979 * others: success. 1980 */ 1981 static u_int32_t 1982 key_getnewspid() 1983 { 1984 INIT_VNET_IPSEC(curvnet); 1985 u_int32_t newid = 0; 1986 int count = V_key_spi_trycnt; /* XXX */ 1987 struct secpolicy *sp; 1988 1989 /* when requesting to allocate spi ranged */ 1990 while (count--) { 1991 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 1992 1993 if ((sp = key_getspbyid(newid)) == NULL) 1994 break; 1995 1996 KEY_FREESP(&sp); 1997 } 1998 1999 if (count == 0 || newid == 0) { 2000 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2001 __func__)); 2002 return 0; 2003 } 2004 2005 return newid; 2006 } 2007 2008 /* 2009 * SADB_SPDDELETE processing 2010 * receive 2011 * <base, address(SD), policy(*)> 2012 * from the user(?), and set SADB_SASTATE_DEAD, 2013 * and send, 2014 * <base, address(SD), policy(*)> 2015 * to the ikmpd. 2016 * policy(*) including direction of policy. 2017 * 2018 * m will always be freed. 2019 */ 2020 static int 2021 key_spddelete(so, m, mhp) 2022 struct socket *so; 2023 struct mbuf *m; 2024 const struct sadb_msghdr *mhp; 2025 { 2026 INIT_VNET_IPSEC(curvnet); 2027 struct sadb_address *src0, *dst0; 2028 struct sadb_x_policy *xpl0; 2029 struct secpolicyindex spidx; 2030 struct secpolicy *sp; 2031 2032 IPSEC_ASSERT(so != NULL, ("null so")); 2033 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2034 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2035 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2036 2037 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2038 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2039 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2040 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2041 __func__)); 2042 return key_senderror(so, m, EINVAL); 2043 } 2044 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2045 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2046 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2047 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2048 __func__)); 2049 return key_senderror(so, m, EINVAL); 2050 } 2051 2052 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2053 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2054 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2055 2056 /* make secindex */ 2057 /* XXX boundary check against sa_len */ 2058 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2059 src0 + 1, 2060 dst0 + 1, 2061 src0->sadb_address_prefixlen, 2062 dst0->sadb_address_prefixlen, 2063 src0->sadb_address_proto, 2064 &spidx); 2065 2066 /* checking the direciton. */ 2067 switch (xpl0->sadb_x_policy_dir) { 2068 case IPSEC_DIR_INBOUND: 2069 case IPSEC_DIR_OUTBOUND: 2070 break; 2071 default: 2072 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2073 return key_senderror(so, m, EINVAL); 2074 } 2075 2076 /* Is there SP in SPD ? */ 2077 if ((sp = key_getsp(&spidx)) == NULL) { 2078 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2079 return key_senderror(so, m, EINVAL); 2080 } 2081 2082 /* save policy id to buffer to be returned. */ 2083 xpl0->sadb_x_policy_id = sp->id; 2084 2085 sp->state = IPSEC_SPSTATE_DEAD; 2086 KEY_FREESP(&sp); 2087 2088 { 2089 struct mbuf *n; 2090 struct sadb_msg *newmsg; 2091 2092 /* create new sadb_msg to reply. */ 2093 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2094 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2095 if (!n) 2096 return key_senderror(so, m, ENOBUFS); 2097 2098 newmsg = mtod(n, struct sadb_msg *); 2099 newmsg->sadb_msg_errno = 0; 2100 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2101 2102 m_freem(m); 2103 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2104 } 2105 } 2106 2107 /* 2108 * SADB_SPDDELETE2 processing 2109 * receive 2110 * <base, policy(*)> 2111 * from the user(?), and set SADB_SASTATE_DEAD, 2112 * and send, 2113 * <base, policy(*)> 2114 * to the ikmpd. 2115 * policy(*) including direction of policy. 2116 * 2117 * m will always be freed. 2118 */ 2119 static int 2120 key_spddelete2(so, m, mhp) 2121 struct socket *so; 2122 struct mbuf *m; 2123 const struct sadb_msghdr *mhp; 2124 { 2125 INIT_VNET_IPSEC(curvnet); 2126 u_int32_t id; 2127 struct secpolicy *sp; 2128 2129 IPSEC_ASSERT(so != NULL, ("null socket")); 2130 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2131 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2132 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2133 2134 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2135 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2136 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2137 return key_senderror(so, m, EINVAL); 2138 } 2139 2140 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2141 2142 /* Is there SP in SPD ? */ 2143 if ((sp = key_getspbyid(id)) == NULL) { 2144 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2145 return key_senderror(so, m, EINVAL); 2146 } 2147 2148 sp->state = IPSEC_SPSTATE_DEAD; 2149 KEY_FREESP(&sp); 2150 2151 { 2152 struct mbuf *n, *nn; 2153 struct sadb_msg *newmsg; 2154 int off, len; 2155 2156 /* create new sadb_msg to reply. */ 2157 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2158 2159 MGETHDR(n, M_DONTWAIT, MT_DATA); 2160 if (n && len > MHLEN) { 2161 MCLGET(n, M_DONTWAIT); 2162 if ((n->m_flags & M_EXT) == 0) { 2163 m_freem(n); 2164 n = NULL; 2165 } 2166 } 2167 if (!n) 2168 return key_senderror(so, m, ENOBUFS); 2169 2170 n->m_len = len; 2171 n->m_next = NULL; 2172 off = 0; 2173 2174 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2175 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2176 2177 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2178 off, len)); 2179 2180 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2181 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2182 if (!n->m_next) { 2183 m_freem(n); 2184 return key_senderror(so, m, ENOBUFS); 2185 } 2186 2187 n->m_pkthdr.len = 0; 2188 for (nn = n; nn; nn = nn->m_next) 2189 n->m_pkthdr.len += nn->m_len; 2190 2191 newmsg = mtod(n, struct sadb_msg *); 2192 newmsg->sadb_msg_errno = 0; 2193 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2194 2195 m_freem(m); 2196 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2197 } 2198 } 2199 2200 /* 2201 * SADB_X_GET processing 2202 * receive 2203 * <base, policy(*)> 2204 * from the user(?), 2205 * and send, 2206 * <base, address(SD), policy> 2207 * to the ikmpd. 2208 * policy(*) including direction of policy. 2209 * 2210 * m will always be freed. 2211 */ 2212 static int 2213 key_spdget(so, m, mhp) 2214 struct socket *so; 2215 struct mbuf *m; 2216 const struct sadb_msghdr *mhp; 2217 { 2218 INIT_VNET_IPSEC(curvnet); 2219 u_int32_t id; 2220 struct secpolicy *sp; 2221 struct mbuf *n; 2222 2223 IPSEC_ASSERT(so != NULL, ("null socket")); 2224 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2225 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2226 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2227 2228 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2229 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2230 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2231 __func__)); 2232 return key_senderror(so, m, EINVAL); 2233 } 2234 2235 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2236 2237 /* Is there SP in SPD ? */ 2238 if ((sp = key_getspbyid(id)) == NULL) { 2239 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2240 return key_senderror(so, m, ENOENT); 2241 } 2242 2243 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2244 if (n != NULL) { 2245 m_freem(m); 2246 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2247 } else 2248 return key_senderror(so, m, ENOBUFS); 2249 } 2250 2251 /* 2252 * SADB_X_SPDACQUIRE processing. 2253 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2254 * send 2255 * <base, policy(*)> 2256 * to KMD, and expect to receive 2257 * <base> with SADB_X_SPDACQUIRE if error occured, 2258 * or 2259 * <base, policy> 2260 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2261 * policy(*) is without policy requests. 2262 * 2263 * 0 : succeed 2264 * others: error number 2265 */ 2266 int 2267 key_spdacquire(sp) 2268 struct secpolicy *sp; 2269 { 2270 INIT_VNET_IPSEC(curvnet); 2271 struct mbuf *result = NULL, *m; 2272 struct secspacq *newspacq; 2273 2274 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2275 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2276 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2277 ("policy not IPSEC %u", sp->policy)); 2278 2279 /* Get an entry to check whether sent message or not. */ 2280 newspacq = key_getspacq(&sp->spidx); 2281 if (newspacq != NULL) { 2282 if (V_key_blockacq_count < newspacq->count) { 2283 /* reset counter and do send message. */ 2284 newspacq->count = 0; 2285 } else { 2286 /* increment counter and do nothing. */ 2287 newspacq->count++; 2288 return 0; 2289 } 2290 SPACQ_UNLOCK(); 2291 } else { 2292 /* make new entry for blocking to send SADB_ACQUIRE. */ 2293 newspacq = key_newspacq(&sp->spidx); 2294 if (newspacq == NULL) 2295 return ENOBUFS; 2296 } 2297 2298 /* create new sadb_msg to reply. */ 2299 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2300 if (!m) 2301 return ENOBUFS; 2302 2303 result = m; 2304 2305 result->m_pkthdr.len = 0; 2306 for (m = result; m; m = m->m_next) 2307 result->m_pkthdr.len += m->m_len; 2308 2309 mtod(result, struct sadb_msg *)->sadb_msg_len = 2310 PFKEY_UNIT64(result->m_pkthdr.len); 2311 2312 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2313 } 2314 2315 /* 2316 * SADB_SPDFLUSH processing 2317 * receive 2318 * <base> 2319 * from the user, and free all entries in secpctree. 2320 * and send, 2321 * <base> 2322 * to the user. 2323 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2324 * 2325 * m will always be freed. 2326 */ 2327 static int 2328 key_spdflush(so, m, mhp) 2329 struct socket *so; 2330 struct mbuf *m; 2331 const struct sadb_msghdr *mhp; 2332 { 2333 INIT_VNET_IPSEC(curvnet); 2334 struct sadb_msg *newmsg; 2335 struct secpolicy *sp; 2336 u_int dir; 2337 2338 IPSEC_ASSERT(so != NULL, ("null socket")); 2339 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2340 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2341 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2342 2343 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2344 return key_senderror(so, m, EINVAL); 2345 2346 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2347 SPTREE_LOCK(); 2348 LIST_FOREACH(sp, &V_sptree[dir], chain) 2349 sp->state = IPSEC_SPSTATE_DEAD; 2350 SPTREE_UNLOCK(); 2351 } 2352 2353 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2354 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2355 return key_senderror(so, m, ENOBUFS); 2356 } 2357 2358 if (m->m_next) 2359 m_freem(m->m_next); 2360 m->m_next = NULL; 2361 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2362 newmsg = mtod(m, struct sadb_msg *); 2363 newmsg->sadb_msg_errno = 0; 2364 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2365 2366 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2367 } 2368 2369 /* 2370 * SADB_SPDDUMP processing 2371 * receive 2372 * <base> 2373 * from the user, and dump all SP leaves 2374 * and send, 2375 * <base> ..... 2376 * to the ikmpd. 2377 * 2378 * m will always be freed. 2379 */ 2380 static int 2381 key_spddump(so, m, mhp) 2382 struct socket *so; 2383 struct mbuf *m; 2384 const struct sadb_msghdr *mhp; 2385 { 2386 INIT_VNET_IPSEC(curvnet); 2387 struct secpolicy *sp; 2388 int cnt; 2389 u_int dir; 2390 struct mbuf *n; 2391 2392 IPSEC_ASSERT(so != NULL, ("null socket")); 2393 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2394 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2395 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2396 2397 /* search SPD entry and get buffer size. */ 2398 cnt = 0; 2399 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2400 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2401 cnt++; 2402 } 2403 } 2404 2405 if (cnt == 0) 2406 return key_senderror(so, m, ENOENT); 2407 2408 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2409 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2410 --cnt; 2411 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2412 mhp->msg->sadb_msg_pid); 2413 2414 if (n) 2415 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2416 } 2417 } 2418 2419 m_freem(m); 2420 return 0; 2421 } 2422 2423 static struct mbuf * 2424 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2425 { 2426 struct mbuf *result = NULL, *m; 2427 struct seclifetime lt; 2428 2429 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2430 if (!m) 2431 goto fail; 2432 result = m; 2433 2434 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2435 &sp->spidx.src.sa, sp->spidx.prefs, 2436 sp->spidx.ul_proto); 2437 if (!m) 2438 goto fail; 2439 m_cat(result, m); 2440 2441 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2442 &sp->spidx.dst.sa, sp->spidx.prefd, 2443 sp->spidx.ul_proto); 2444 if (!m) 2445 goto fail; 2446 m_cat(result, m); 2447 2448 m = key_sp2msg(sp); 2449 if (!m) 2450 goto fail; 2451 m_cat(result, m); 2452 2453 if(sp->lifetime){ 2454 lt.addtime=sp->created; 2455 lt.usetime= sp->lastused; 2456 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2457 if (!m) 2458 goto fail; 2459 m_cat(result, m); 2460 2461 lt.addtime=sp->lifetime; 2462 lt.usetime= sp->validtime; 2463 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2464 if (!m) 2465 goto fail; 2466 m_cat(result, m); 2467 } 2468 2469 if ((result->m_flags & M_PKTHDR) == 0) 2470 goto fail; 2471 2472 if (result->m_len < sizeof(struct sadb_msg)) { 2473 result = m_pullup(result, sizeof(struct sadb_msg)); 2474 if (result == NULL) 2475 goto fail; 2476 } 2477 2478 result->m_pkthdr.len = 0; 2479 for (m = result; m; m = m->m_next) 2480 result->m_pkthdr.len += m->m_len; 2481 2482 mtod(result, struct sadb_msg *)->sadb_msg_len = 2483 PFKEY_UNIT64(result->m_pkthdr.len); 2484 2485 return result; 2486 2487 fail: 2488 m_freem(result); 2489 return NULL; 2490 } 2491 2492 /* 2493 * get PFKEY message length for security policy and request. 2494 */ 2495 static u_int 2496 key_getspreqmsglen(sp) 2497 struct secpolicy *sp; 2498 { 2499 u_int tlen; 2500 2501 tlen = sizeof(struct sadb_x_policy); 2502 2503 /* if is the policy for ipsec ? */ 2504 if (sp->policy != IPSEC_POLICY_IPSEC) 2505 return tlen; 2506 2507 /* get length of ipsec requests */ 2508 { 2509 struct ipsecrequest *isr; 2510 int len; 2511 2512 for (isr = sp->req; isr != NULL; isr = isr->next) { 2513 len = sizeof(struct sadb_x_ipsecrequest) 2514 + isr->saidx.src.sa.sa_len 2515 + isr->saidx.dst.sa.sa_len; 2516 2517 tlen += PFKEY_ALIGN8(len); 2518 } 2519 } 2520 2521 return tlen; 2522 } 2523 2524 /* 2525 * SADB_SPDEXPIRE processing 2526 * send 2527 * <base, address(SD), lifetime(CH), policy> 2528 * to KMD by PF_KEY. 2529 * 2530 * OUT: 0 : succeed 2531 * others : error number 2532 */ 2533 static int 2534 key_spdexpire(sp) 2535 struct secpolicy *sp; 2536 { 2537 struct mbuf *result = NULL, *m; 2538 int len; 2539 int error = -1; 2540 struct sadb_lifetime *lt; 2541 2542 /* XXX: Why do we lock ? */ 2543 2544 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2545 2546 /* set msg header */ 2547 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2548 if (!m) { 2549 error = ENOBUFS; 2550 goto fail; 2551 } 2552 result = m; 2553 2554 /* create lifetime extension (current and hard) */ 2555 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2556 m = key_alloc_mbuf(len); 2557 if (!m || m->m_next) { /*XXX*/ 2558 if (m) 2559 m_freem(m); 2560 error = ENOBUFS; 2561 goto fail; 2562 } 2563 bzero(mtod(m, caddr_t), len); 2564 lt = mtod(m, struct sadb_lifetime *); 2565 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2566 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2567 lt->sadb_lifetime_allocations = 0; 2568 lt->sadb_lifetime_bytes = 0; 2569 lt->sadb_lifetime_addtime = sp->created; 2570 lt->sadb_lifetime_usetime = sp->lastused; 2571 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2572 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2573 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2574 lt->sadb_lifetime_allocations = 0; 2575 lt->sadb_lifetime_bytes = 0; 2576 lt->sadb_lifetime_addtime = sp->lifetime; 2577 lt->sadb_lifetime_usetime = sp->validtime; 2578 m_cat(result, m); 2579 2580 /* set sadb_address for source */ 2581 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2582 &sp->spidx.src.sa, 2583 sp->spidx.prefs, sp->spidx.ul_proto); 2584 if (!m) { 2585 error = ENOBUFS; 2586 goto fail; 2587 } 2588 m_cat(result, m); 2589 2590 /* set sadb_address for destination */ 2591 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2592 &sp->spidx.dst.sa, 2593 sp->spidx.prefd, sp->spidx.ul_proto); 2594 if (!m) { 2595 error = ENOBUFS; 2596 goto fail; 2597 } 2598 m_cat(result, m); 2599 2600 /* set secpolicy */ 2601 m = key_sp2msg(sp); 2602 if (!m) { 2603 error = ENOBUFS; 2604 goto fail; 2605 } 2606 m_cat(result, m); 2607 2608 if ((result->m_flags & M_PKTHDR) == 0) { 2609 error = EINVAL; 2610 goto fail; 2611 } 2612 2613 if (result->m_len < sizeof(struct sadb_msg)) { 2614 result = m_pullup(result, sizeof(struct sadb_msg)); 2615 if (result == NULL) { 2616 error = ENOBUFS; 2617 goto fail; 2618 } 2619 } 2620 2621 result->m_pkthdr.len = 0; 2622 for (m = result; m; m = m->m_next) 2623 result->m_pkthdr.len += m->m_len; 2624 2625 mtod(result, struct sadb_msg *)->sadb_msg_len = 2626 PFKEY_UNIT64(result->m_pkthdr.len); 2627 2628 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2629 2630 fail: 2631 if (result) 2632 m_freem(result); 2633 return error; 2634 } 2635 2636 /* %%% SAD management */ 2637 /* 2638 * allocating a memory for new SA head, and copy from the values of mhp. 2639 * OUT: NULL : failure due to the lack of memory. 2640 * others : pointer to new SA head. 2641 */ 2642 static struct secashead * 2643 key_newsah(saidx) 2644 struct secasindex *saidx; 2645 { 2646 INIT_VNET_IPSEC(curvnet); 2647 struct secashead *newsah; 2648 2649 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2650 2651 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2652 if (newsah != NULL) { 2653 int i; 2654 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2655 LIST_INIT(&newsah->savtree[i]); 2656 newsah->saidx = *saidx; 2657 2658 /* add to saidxtree */ 2659 newsah->state = SADB_SASTATE_MATURE; 2660 2661 SAHTREE_LOCK(); 2662 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2663 SAHTREE_UNLOCK(); 2664 } 2665 return(newsah); 2666 } 2667 2668 /* 2669 * delete SA index and all SA registerd. 2670 */ 2671 static void 2672 key_delsah(sah) 2673 struct secashead *sah; 2674 { 2675 INIT_VNET_IPSEC(curvnet); 2676 struct secasvar *sav, *nextsav; 2677 u_int stateidx; 2678 int zombie = 0; 2679 2680 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2681 SAHTREE_LOCK_ASSERT(); 2682 2683 /* searching all SA registerd in the secindex. */ 2684 for (stateidx = 0; 2685 stateidx < _ARRAYLEN(saorder_state_any); 2686 stateidx++) { 2687 u_int state = saorder_state_any[stateidx]; 2688 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2689 if (sav->refcnt == 0) { 2690 /* sanity check */ 2691 KEY_CHKSASTATE(state, sav->state, __func__); 2692 /* 2693 * do NOT call KEY_FREESAV here: 2694 * it will only delete the sav if refcnt == 1, 2695 * where we already know that refcnt == 0 2696 */ 2697 key_delsav(sav); 2698 } else { 2699 /* give up to delete this sa */ 2700 zombie++; 2701 } 2702 } 2703 } 2704 if (!zombie) { /* delete only if there are savs */ 2705 /* remove from tree of SA index */ 2706 if (__LIST_CHAINED(sah)) 2707 LIST_REMOVE(sah, chain); 2708 if (sah->sa_route.ro_rt) { 2709 RTFREE(sah->sa_route.ro_rt); 2710 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2711 } 2712 free(sah, M_IPSEC_SAH); 2713 } 2714 } 2715 2716 /* 2717 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2718 * and copy the values of mhp into new buffer. 2719 * When SAD message type is GETSPI: 2720 * to set sequence number from acq_seq++, 2721 * to set zero to SPI. 2722 * not to call key_setsava(). 2723 * OUT: NULL : fail 2724 * others : pointer to new secasvar. 2725 * 2726 * does not modify mbuf. does not free mbuf on error. 2727 */ 2728 static struct secasvar * 2729 key_newsav(m, mhp, sah, errp, where, tag) 2730 struct mbuf *m; 2731 const struct sadb_msghdr *mhp; 2732 struct secashead *sah; 2733 int *errp; 2734 const char* where; 2735 int tag; 2736 { 2737 INIT_VNET_IPSEC(curvnet); 2738 struct secasvar *newsav; 2739 const struct sadb_sa *xsa; 2740 2741 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2742 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2743 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2744 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2745 2746 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2747 if (newsav == NULL) { 2748 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2749 *errp = ENOBUFS; 2750 goto done; 2751 } 2752 2753 switch (mhp->msg->sadb_msg_type) { 2754 case SADB_GETSPI: 2755 newsav->spi = 0; 2756 2757 #ifdef IPSEC_DOSEQCHECK 2758 /* sync sequence number */ 2759 if (mhp->msg->sadb_msg_seq == 0) 2760 newsav->seq = 2761 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2762 else 2763 #endif 2764 newsav->seq = mhp->msg->sadb_msg_seq; 2765 break; 2766 2767 case SADB_ADD: 2768 /* sanity check */ 2769 if (mhp->ext[SADB_EXT_SA] == NULL) { 2770 free(newsav, M_IPSEC_SA); 2771 newsav = NULL; 2772 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2773 __func__)); 2774 *errp = EINVAL; 2775 goto done; 2776 } 2777 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2778 newsav->spi = xsa->sadb_sa_spi; 2779 newsav->seq = mhp->msg->sadb_msg_seq; 2780 break; 2781 default: 2782 free(newsav, M_IPSEC_SA); 2783 newsav = NULL; 2784 *errp = EINVAL; 2785 goto done; 2786 } 2787 2788 2789 /* copy sav values */ 2790 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2791 *errp = key_setsaval(newsav, m, mhp); 2792 if (*errp) { 2793 free(newsav, M_IPSEC_SA); 2794 newsav = NULL; 2795 goto done; 2796 } 2797 } 2798 2799 SECASVAR_LOCK_INIT(newsav); 2800 2801 /* reset created */ 2802 newsav->created = time_second; 2803 newsav->pid = mhp->msg->sadb_msg_pid; 2804 2805 /* add to satree */ 2806 newsav->sah = sah; 2807 sa_initref(newsav); 2808 newsav->state = SADB_SASTATE_LARVAL; 2809 2810 /* XXX locking??? */ 2811 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2812 secasvar, chain); 2813 done: 2814 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2815 printf("DP %s from %s:%u return SP:%p\n", __func__, 2816 where, tag, newsav)); 2817 2818 return newsav; 2819 } 2820 2821 /* 2822 * free() SA variable entry. 2823 */ 2824 static void 2825 key_cleansav(struct secasvar *sav) 2826 { 2827 /* 2828 * Cleanup xform state. Note that zeroize'ing causes the 2829 * keys to be cleared; otherwise we must do it ourself. 2830 */ 2831 if (sav->tdb_xform != NULL) { 2832 sav->tdb_xform->xf_zeroize(sav); 2833 sav->tdb_xform = NULL; 2834 } else { 2835 KASSERT(sav->iv == NULL, ("iv but no xform")); 2836 if (sav->key_auth != NULL) 2837 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2838 if (sav->key_enc != NULL) 2839 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2840 } 2841 if (sav->key_auth != NULL) { 2842 if (sav->key_auth->key_data != NULL) 2843 free(sav->key_auth->key_data, M_IPSEC_MISC); 2844 free(sav->key_auth, M_IPSEC_MISC); 2845 sav->key_auth = NULL; 2846 } 2847 if (sav->key_enc != NULL) { 2848 if (sav->key_enc->key_data != NULL) 2849 free(sav->key_enc->key_data, M_IPSEC_MISC); 2850 free(sav->key_enc, M_IPSEC_MISC); 2851 sav->key_enc = NULL; 2852 } 2853 if (sav->sched) { 2854 bzero(sav->sched, sav->schedlen); 2855 free(sav->sched, M_IPSEC_MISC); 2856 sav->sched = NULL; 2857 } 2858 if (sav->replay != NULL) { 2859 free(sav->replay, M_IPSEC_MISC); 2860 sav->replay = NULL; 2861 } 2862 if (sav->lft_c != NULL) { 2863 free(sav->lft_c, M_IPSEC_MISC); 2864 sav->lft_c = NULL; 2865 } 2866 if (sav->lft_h != NULL) { 2867 free(sav->lft_h, M_IPSEC_MISC); 2868 sav->lft_h = NULL; 2869 } 2870 if (sav->lft_s != NULL) { 2871 free(sav->lft_s, M_IPSEC_MISC); 2872 sav->lft_s = NULL; 2873 } 2874 } 2875 2876 /* 2877 * free() SA variable entry. 2878 */ 2879 static void 2880 key_delsav(sav) 2881 struct secasvar *sav; 2882 { 2883 IPSEC_ASSERT(sav != NULL, ("null sav")); 2884 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2885 2886 /* remove from SA header */ 2887 if (__LIST_CHAINED(sav)) 2888 LIST_REMOVE(sav, chain); 2889 key_cleansav(sav); 2890 SECASVAR_LOCK_DESTROY(sav); 2891 free(sav, M_IPSEC_SA); 2892 } 2893 2894 /* 2895 * search SAD. 2896 * OUT: 2897 * NULL : not found 2898 * others : found, pointer to a SA. 2899 */ 2900 static struct secashead * 2901 key_getsah(saidx) 2902 struct secasindex *saidx; 2903 { 2904 INIT_VNET_IPSEC(curvnet); 2905 struct secashead *sah; 2906 2907 SAHTREE_LOCK(); 2908 LIST_FOREACH(sah, &V_sahtree, chain) { 2909 if (sah->state == SADB_SASTATE_DEAD) 2910 continue; 2911 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2912 break; 2913 } 2914 SAHTREE_UNLOCK(); 2915 2916 return sah; 2917 } 2918 2919 /* 2920 * check not to be duplicated SPI. 2921 * NOTE: this function is too slow due to searching all SAD. 2922 * OUT: 2923 * NULL : not found 2924 * others : found, pointer to a SA. 2925 */ 2926 static struct secasvar * 2927 key_checkspidup(saidx, spi) 2928 struct secasindex *saidx; 2929 u_int32_t spi; 2930 { 2931 INIT_VNET_IPSEC(curvnet); 2932 struct secashead *sah; 2933 struct secasvar *sav; 2934 2935 /* check address family */ 2936 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2937 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2938 __func__)); 2939 return NULL; 2940 } 2941 2942 sav = NULL; 2943 /* check all SAD */ 2944 SAHTREE_LOCK(); 2945 LIST_FOREACH(sah, &V_sahtree, chain) { 2946 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2947 continue; 2948 sav = key_getsavbyspi(sah, spi); 2949 if (sav != NULL) 2950 break; 2951 } 2952 SAHTREE_UNLOCK(); 2953 2954 return sav; 2955 } 2956 2957 /* 2958 * search SAD litmited alive SA, protocol, SPI. 2959 * OUT: 2960 * NULL : not found 2961 * others : found, pointer to a SA. 2962 */ 2963 static struct secasvar * 2964 key_getsavbyspi(sah, spi) 2965 struct secashead *sah; 2966 u_int32_t spi; 2967 { 2968 INIT_VNET_IPSEC(curvnet); 2969 struct secasvar *sav; 2970 u_int stateidx, state; 2971 2972 sav = NULL; 2973 SAHTREE_LOCK_ASSERT(); 2974 /* search all status */ 2975 for (stateidx = 0; 2976 stateidx < _ARRAYLEN(saorder_state_alive); 2977 stateidx++) { 2978 2979 state = saorder_state_alive[stateidx]; 2980 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2981 2982 /* sanity check */ 2983 if (sav->state != state) { 2984 ipseclog((LOG_DEBUG, "%s: " 2985 "invalid sav->state (queue: %d SA: %d)\n", 2986 __func__, state, sav->state)); 2987 continue; 2988 } 2989 2990 if (sav->spi == spi) 2991 return sav; 2992 } 2993 } 2994 2995 return NULL; 2996 } 2997 2998 /* 2999 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3000 * You must update these if need. 3001 * OUT: 0: success. 3002 * !0: failure. 3003 * 3004 * does not modify mbuf. does not free mbuf on error. 3005 */ 3006 static int 3007 key_setsaval(sav, m, mhp) 3008 struct secasvar *sav; 3009 struct mbuf *m; 3010 const struct sadb_msghdr *mhp; 3011 { 3012 INIT_VNET_IPSEC(curvnet); 3013 int error = 0; 3014 3015 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3016 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3017 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3018 3019 /* initialization */ 3020 sav->replay = NULL; 3021 sav->key_auth = NULL; 3022 sav->key_enc = NULL; 3023 sav->sched = NULL; 3024 sav->schedlen = 0; 3025 sav->iv = NULL; 3026 sav->lft_c = NULL; 3027 sav->lft_h = NULL; 3028 sav->lft_s = NULL; 3029 sav->tdb_xform = NULL; /* transform */ 3030 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3031 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3032 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3033 3034 /* SA */ 3035 if (mhp->ext[SADB_EXT_SA] != NULL) { 3036 const struct sadb_sa *sa0; 3037 3038 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3039 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3040 error = EINVAL; 3041 goto fail; 3042 } 3043 3044 sav->alg_auth = sa0->sadb_sa_auth; 3045 sav->alg_enc = sa0->sadb_sa_encrypt; 3046 sav->flags = sa0->sadb_sa_flags; 3047 3048 /* replay window */ 3049 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3050 sav->replay = (struct secreplay *) 3051 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3052 if (sav->replay == NULL) { 3053 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3054 __func__)); 3055 error = ENOBUFS; 3056 goto fail; 3057 } 3058 if (sa0->sadb_sa_replay != 0) 3059 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3060 sav->replay->wsize = sa0->sadb_sa_replay; 3061 } 3062 } 3063 3064 /* Authentication keys */ 3065 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3066 const struct sadb_key *key0; 3067 int len; 3068 3069 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3070 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3071 3072 error = 0; 3073 if (len < sizeof(*key0)) { 3074 error = EINVAL; 3075 goto fail; 3076 } 3077 switch (mhp->msg->sadb_msg_satype) { 3078 case SADB_SATYPE_AH: 3079 case SADB_SATYPE_ESP: 3080 case SADB_X_SATYPE_TCPSIGNATURE: 3081 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3082 sav->alg_auth != SADB_X_AALG_NULL) 3083 error = EINVAL; 3084 break; 3085 case SADB_X_SATYPE_IPCOMP: 3086 default: 3087 error = EINVAL; 3088 break; 3089 } 3090 if (error) { 3091 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3092 __func__)); 3093 goto fail; 3094 } 3095 3096 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3097 M_IPSEC_MISC); 3098 if (sav->key_auth == NULL ) { 3099 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3100 __func__)); 3101 error = ENOBUFS; 3102 goto fail; 3103 } 3104 } 3105 3106 /* Encryption key */ 3107 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3108 const struct sadb_key *key0; 3109 int len; 3110 3111 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3112 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3113 3114 error = 0; 3115 if (len < sizeof(*key0)) { 3116 error = EINVAL; 3117 goto fail; 3118 } 3119 switch (mhp->msg->sadb_msg_satype) { 3120 case SADB_SATYPE_ESP: 3121 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3122 sav->alg_enc != SADB_EALG_NULL) { 3123 error = EINVAL; 3124 break; 3125 } 3126 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3127 len, 3128 M_IPSEC_MISC); 3129 if (sav->key_enc == NULL) { 3130 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3131 __func__)); 3132 error = ENOBUFS; 3133 goto fail; 3134 } 3135 break; 3136 case SADB_X_SATYPE_IPCOMP: 3137 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3138 error = EINVAL; 3139 sav->key_enc = NULL; /*just in case*/ 3140 break; 3141 case SADB_SATYPE_AH: 3142 case SADB_X_SATYPE_TCPSIGNATURE: 3143 default: 3144 error = EINVAL; 3145 break; 3146 } 3147 if (error) { 3148 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3149 __func__)); 3150 goto fail; 3151 } 3152 } 3153 3154 /* set iv */ 3155 sav->ivlen = 0; 3156 3157 switch (mhp->msg->sadb_msg_satype) { 3158 case SADB_SATYPE_AH: 3159 error = xform_init(sav, XF_AH); 3160 break; 3161 case SADB_SATYPE_ESP: 3162 error = xform_init(sav, XF_ESP); 3163 break; 3164 case SADB_X_SATYPE_IPCOMP: 3165 error = xform_init(sav, XF_IPCOMP); 3166 break; 3167 case SADB_X_SATYPE_TCPSIGNATURE: 3168 error = xform_init(sav, XF_TCPSIGNATURE); 3169 break; 3170 } 3171 if (error) { 3172 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3173 __func__, mhp->msg->sadb_msg_satype)); 3174 goto fail; 3175 } 3176 3177 /* reset created */ 3178 sav->created = time_second; 3179 3180 /* make lifetime for CURRENT */ 3181 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3182 if (sav->lft_c == NULL) { 3183 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3184 error = ENOBUFS; 3185 goto fail; 3186 } 3187 3188 sav->lft_c->allocations = 0; 3189 sav->lft_c->bytes = 0; 3190 sav->lft_c->addtime = time_second; 3191 sav->lft_c->usetime = 0; 3192 3193 /* lifetimes for HARD and SOFT */ 3194 { 3195 const struct sadb_lifetime *lft0; 3196 3197 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3198 if (lft0 != NULL) { 3199 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3200 error = EINVAL; 3201 goto fail; 3202 } 3203 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3204 if (sav->lft_h == NULL) { 3205 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3206 error = ENOBUFS; 3207 goto fail; 3208 } 3209 /* to be initialize ? */ 3210 } 3211 3212 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3213 if (lft0 != NULL) { 3214 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3215 error = EINVAL; 3216 goto fail; 3217 } 3218 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3219 if (sav->lft_s == NULL) { 3220 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3221 error = ENOBUFS; 3222 goto fail; 3223 } 3224 /* to be initialize ? */ 3225 } 3226 } 3227 3228 return 0; 3229 3230 fail: 3231 /* initialization */ 3232 key_cleansav(sav); 3233 3234 return error; 3235 } 3236 3237 /* 3238 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3239 * OUT: 0: valid 3240 * other: errno 3241 */ 3242 static int 3243 key_mature(struct secasvar *sav) 3244 { 3245 INIT_VNET_IPSEC(curvnet); 3246 int error; 3247 3248 /* check SPI value */ 3249 switch (sav->sah->saidx.proto) { 3250 case IPPROTO_ESP: 3251 case IPPROTO_AH: 3252 /* 3253 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3254 * 1-255 reserved by IANA for future use, 3255 * 0 for implementation specific, local use. 3256 */ 3257 if (ntohl(sav->spi) <= 255) { 3258 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3259 __func__, (u_int32_t)ntohl(sav->spi))); 3260 return EINVAL; 3261 } 3262 break; 3263 } 3264 3265 /* check satype */ 3266 switch (sav->sah->saidx.proto) { 3267 case IPPROTO_ESP: 3268 /* check flags */ 3269 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3270 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3271 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3272 "given to old-esp.\n", __func__)); 3273 return EINVAL; 3274 } 3275 error = xform_init(sav, XF_ESP); 3276 break; 3277 case IPPROTO_AH: 3278 /* check flags */ 3279 if (sav->flags & SADB_X_EXT_DERIV) { 3280 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3281 "given to AH SA.\n", __func__)); 3282 return EINVAL; 3283 } 3284 if (sav->alg_enc != SADB_EALG_NONE) { 3285 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3286 "mismated.\n", __func__)); 3287 return(EINVAL); 3288 } 3289 error = xform_init(sav, XF_AH); 3290 break; 3291 case IPPROTO_IPCOMP: 3292 if (sav->alg_auth != SADB_AALG_NONE) { 3293 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3294 "mismated.\n", __func__)); 3295 return(EINVAL); 3296 } 3297 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3298 && ntohl(sav->spi) >= 0x10000) { 3299 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3300 __func__)); 3301 return(EINVAL); 3302 } 3303 error = xform_init(sav, XF_IPCOMP); 3304 break; 3305 case IPPROTO_TCP: 3306 if (sav->alg_enc != SADB_EALG_NONE) { 3307 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3308 "mismated.\n", __func__)); 3309 return(EINVAL); 3310 } 3311 error = xform_init(sav, XF_TCPSIGNATURE); 3312 break; 3313 default: 3314 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3315 error = EPROTONOSUPPORT; 3316 break; 3317 } 3318 if (error == 0) { 3319 SAHTREE_LOCK(); 3320 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3321 SAHTREE_UNLOCK(); 3322 } 3323 return (error); 3324 } 3325 3326 /* 3327 * subroutine for SADB_GET and SADB_DUMP. 3328 */ 3329 static struct mbuf * 3330 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3331 u_int32_t seq, u_int32_t pid) 3332 { 3333 struct mbuf *result = NULL, *tres = NULL, *m; 3334 int i; 3335 int dumporder[] = { 3336 SADB_EXT_SA, SADB_X_EXT_SA2, 3337 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3338 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3339 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3340 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3341 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3342 }; 3343 3344 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3345 if (m == NULL) 3346 goto fail; 3347 result = m; 3348 3349 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3350 m = NULL; 3351 switch (dumporder[i]) { 3352 case SADB_EXT_SA: 3353 m = key_setsadbsa(sav); 3354 if (!m) 3355 goto fail; 3356 break; 3357 3358 case SADB_X_EXT_SA2: 3359 m = key_setsadbxsa2(sav->sah->saidx.mode, 3360 sav->replay ? sav->replay->count : 0, 3361 sav->sah->saidx.reqid); 3362 if (!m) 3363 goto fail; 3364 break; 3365 3366 case SADB_EXT_ADDRESS_SRC: 3367 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3368 &sav->sah->saidx.src.sa, 3369 FULLMASK, IPSEC_ULPROTO_ANY); 3370 if (!m) 3371 goto fail; 3372 break; 3373 3374 case SADB_EXT_ADDRESS_DST: 3375 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3376 &sav->sah->saidx.dst.sa, 3377 FULLMASK, IPSEC_ULPROTO_ANY); 3378 if (!m) 3379 goto fail; 3380 break; 3381 3382 case SADB_EXT_KEY_AUTH: 3383 if (!sav->key_auth) 3384 continue; 3385 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3386 if (!m) 3387 goto fail; 3388 break; 3389 3390 case SADB_EXT_KEY_ENCRYPT: 3391 if (!sav->key_enc) 3392 continue; 3393 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3394 if (!m) 3395 goto fail; 3396 break; 3397 3398 case SADB_EXT_LIFETIME_CURRENT: 3399 if (!sav->lft_c) 3400 continue; 3401 m = key_setlifetime(sav->lft_c, 3402 SADB_EXT_LIFETIME_CURRENT); 3403 if (!m) 3404 goto fail; 3405 break; 3406 3407 case SADB_EXT_LIFETIME_HARD: 3408 if (!sav->lft_h) 3409 continue; 3410 m = key_setlifetime(sav->lft_h, 3411 SADB_EXT_LIFETIME_HARD); 3412 if (!m) 3413 goto fail; 3414 break; 3415 3416 case SADB_EXT_LIFETIME_SOFT: 3417 if (!sav->lft_s) 3418 continue; 3419 m = key_setlifetime(sav->lft_s, 3420 SADB_EXT_LIFETIME_SOFT); 3421 3422 if (!m) 3423 goto fail; 3424 break; 3425 3426 case SADB_EXT_ADDRESS_PROXY: 3427 case SADB_EXT_IDENTITY_SRC: 3428 case SADB_EXT_IDENTITY_DST: 3429 /* XXX: should we brought from SPD ? */ 3430 case SADB_EXT_SENSITIVITY: 3431 default: 3432 continue; 3433 } 3434 3435 if (!m) 3436 goto fail; 3437 if (tres) 3438 m_cat(m, tres); 3439 tres = m; 3440 3441 } 3442 3443 m_cat(result, tres); 3444 if (result->m_len < sizeof(struct sadb_msg)) { 3445 result = m_pullup(result, sizeof(struct sadb_msg)); 3446 if (result == NULL) 3447 goto fail; 3448 } 3449 3450 result->m_pkthdr.len = 0; 3451 for (m = result; m; m = m->m_next) 3452 result->m_pkthdr.len += m->m_len; 3453 3454 mtod(result, struct sadb_msg *)->sadb_msg_len = 3455 PFKEY_UNIT64(result->m_pkthdr.len); 3456 3457 return result; 3458 3459 fail: 3460 m_freem(result); 3461 m_freem(tres); 3462 return NULL; 3463 } 3464 3465 /* 3466 * set data into sadb_msg. 3467 */ 3468 static struct mbuf * 3469 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3470 pid_t pid, u_int16_t reserved) 3471 { 3472 struct mbuf *m; 3473 struct sadb_msg *p; 3474 int len; 3475 3476 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3477 if (len > MCLBYTES) 3478 return NULL; 3479 MGETHDR(m, M_DONTWAIT, MT_DATA); 3480 if (m && len > MHLEN) { 3481 MCLGET(m, M_DONTWAIT); 3482 if ((m->m_flags & M_EXT) == 0) { 3483 m_freem(m); 3484 m = NULL; 3485 } 3486 } 3487 if (!m) 3488 return NULL; 3489 m->m_pkthdr.len = m->m_len = len; 3490 m->m_next = NULL; 3491 3492 p = mtod(m, struct sadb_msg *); 3493 3494 bzero(p, len); 3495 p->sadb_msg_version = PF_KEY_V2; 3496 p->sadb_msg_type = type; 3497 p->sadb_msg_errno = 0; 3498 p->sadb_msg_satype = satype; 3499 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3500 p->sadb_msg_reserved = reserved; 3501 p->sadb_msg_seq = seq; 3502 p->sadb_msg_pid = (u_int32_t)pid; 3503 3504 return m; 3505 } 3506 3507 /* 3508 * copy secasvar data into sadb_address. 3509 */ 3510 static struct mbuf * 3511 key_setsadbsa(sav) 3512 struct secasvar *sav; 3513 { 3514 struct mbuf *m; 3515 struct sadb_sa *p; 3516 int len; 3517 3518 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3519 m = key_alloc_mbuf(len); 3520 if (!m || m->m_next) { /*XXX*/ 3521 if (m) 3522 m_freem(m); 3523 return NULL; 3524 } 3525 3526 p = mtod(m, struct sadb_sa *); 3527 3528 bzero(p, len); 3529 p->sadb_sa_len = PFKEY_UNIT64(len); 3530 p->sadb_sa_exttype = SADB_EXT_SA; 3531 p->sadb_sa_spi = sav->spi; 3532 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3533 p->sadb_sa_state = sav->state; 3534 p->sadb_sa_auth = sav->alg_auth; 3535 p->sadb_sa_encrypt = sav->alg_enc; 3536 p->sadb_sa_flags = sav->flags; 3537 3538 return m; 3539 } 3540 3541 /* 3542 * set data into sadb_address. 3543 */ 3544 static struct mbuf * 3545 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3546 { 3547 struct mbuf *m; 3548 struct sadb_address *p; 3549 size_t len; 3550 3551 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3552 PFKEY_ALIGN8(saddr->sa_len); 3553 m = key_alloc_mbuf(len); 3554 if (!m || m->m_next) { /*XXX*/ 3555 if (m) 3556 m_freem(m); 3557 return NULL; 3558 } 3559 3560 p = mtod(m, struct sadb_address *); 3561 3562 bzero(p, len); 3563 p->sadb_address_len = PFKEY_UNIT64(len); 3564 p->sadb_address_exttype = exttype; 3565 p->sadb_address_proto = ul_proto; 3566 if (prefixlen == FULLMASK) { 3567 switch (saddr->sa_family) { 3568 case AF_INET: 3569 prefixlen = sizeof(struct in_addr) << 3; 3570 break; 3571 case AF_INET6: 3572 prefixlen = sizeof(struct in6_addr) << 3; 3573 break; 3574 default: 3575 ; /*XXX*/ 3576 } 3577 } 3578 p->sadb_address_prefixlen = prefixlen; 3579 p->sadb_address_reserved = 0; 3580 3581 bcopy(saddr, 3582 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3583 saddr->sa_len); 3584 3585 return m; 3586 } 3587 3588 /* 3589 * set data into sadb_x_sa2. 3590 */ 3591 static struct mbuf * 3592 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3593 { 3594 struct mbuf *m; 3595 struct sadb_x_sa2 *p; 3596 size_t len; 3597 3598 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3599 m = key_alloc_mbuf(len); 3600 if (!m || m->m_next) { /*XXX*/ 3601 if (m) 3602 m_freem(m); 3603 return NULL; 3604 } 3605 3606 p = mtod(m, struct sadb_x_sa2 *); 3607 3608 bzero(p, len); 3609 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3610 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3611 p->sadb_x_sa2_mode = mode; 3612 p->sadb_x_sa2_reserved1 = 0; 3613 p->sadb_x_sa2_reserved2 = 0; 3614 p->sadb_x_sa2_sequence = seq; 3615 p->sadb_x_sa2_reqid = reqid; 3616 3617 return m; 3618 } 3619 3620 /* 3621 * set data into sadb_x_policy 3622 */ 3623 static struct mbuf * 3624 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3625 { 3626 struct mbuf *m; 3627 struct sadb_x_policy *p; 3628 size_t len; 3629 3630 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3631 m = key_alloc_mbuf(len); 3632 if (!m || m->m_next) { /*XXX*/ 3633 if (m) 3634 m_freem(m); 3635 return NULL; 3636 } 3637 3638 p = mtod(m, struct sadb_x_policy *); 3639 3640 bzero(p, len); 3641 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3642 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3643 p->sadb_x_policy_type = type; 3644 p->sadb_x_policy_dir = dir; 3645 p->sadb_x_policy_id = id; 3646 3647 return m; 3648 } 3649 3650 /* %%% utilities */ 3651 /* Take a key message (sadb_key) from the socket and turn it into one 3652 * of the kernel's key structures (seckey). 3653 * 3654 * IN: pointer to the src 3655 * OUT: NULL no more memory 3656 */ 3657 struct seckey * 3658 key_dup_keymsg(const struct sadb_key *src, u_int len, 3659 struct malloc_type *type) 3660 { 3661 INIT_VNET_IPSEC(curvnet); 3662 struct seckey *dst; 3663 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3664 if (dst != NULL) { 3665 dst->bits = src->sadb_key_bits; 3666 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3667 if (dst->key_data != NULL) { 3668 bcopy((const char *)src + sizeof(struct sadb_key), 3669 dst->key_data, len); 3670 } else { 3671 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3672 __func__)); 3673 free(dst, type); 3674 dst = NULL; 3675 } 3676 } else { 3677 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3678 __func__)); 3679 3680 } 3681 return dst; 3682 } 3683 3684 /* Take a lifetime message (sadb_lifetime) passed in on a socket and 3685 * turn it into one of the kernel's lifetime structures (seclifetime). 3686 * 3687 * IN: pointer to the destination, source and malloc type 3688 * OUT: NULL, no more memory 3689 */ 3690 3691 static struct seclifetime * 3692 key_dup_lifemsg(const struct sadb_lifetime *src, 3693 struct malloc_type *type) 3694 { 3695 INIT_VNET_IPSEC(curvnet); 3696 struct seclifetime *dst = NULL; 3697 3698 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3699 type, M_NOWAIT); 3700 if (dst == NULL) { 3701 /* XXX counter */ 3702 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3703 } else { 3704 dst->allocations = src->sadb_lifetime_allocations; 3705 dst->bytes = src->sadb_lifetime_bytes; 3706 dst->addtime = src->sadb_lifetime_addtime; 3707 dst->usetime = src->sadb_lifetime_usetime; 3708 } 3709 return dst; 3710 } 3711 3712 /* compare my own address 3713 * OUT: 1: true, i.e. my address. 3714 * 0: false 3715 */ 3716 int 3717 key_ismyaddr(sa) 3718 struct sockaddr *sa; 3719 { 3720 #ifdef INET 3721 INIT_VNET_INET(curvnet); 3722 struct sockaddr_in *sin; 3723 struct in_ifaddr *ia; 3724 #endif 3725 3726 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3727 3728 switch (sa->sa_family) { 3729 #ifdef INET 3730 case AF_INET: 3731 sin = (struct sockaddr_in *)sa; 3732 for (ia = V_in_ifaddrhead.tqh_first; ia; 3733 ia = ia->ia_link.tqe_next) 3734 { 3735 if (sin->sin_family == ia->ia_addr.sin_family && 3736 sin->sin_len == ia->ia_addr.sin_len && 3737 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3738 { 3739 return 1; 3740 } 3741 } 3742 break; 3743 #endif 3744 #ifdef INET6 3745 case AF_INET6: 3746 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3747 #endif 3748 } 3749 3750 return 0; 3751 } 3752 3753 #ifdef INET6 3754 /* 3755 * compare my own address for IPv6. 3756 * 1: ours 3757 * 0: other 3758 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3759 */ 3760 #include <netinet6/in6_var.h> 3761 3762 static int 3763 key_ismyaddr6(sin6) 3764 struct sockaddr_in6 *sin6; 3765 { 3766 INIT_VNET_INET6(curvnet); 3767 struct in6_ifaddr *ia; 3768 #if 0 3769 struct in6_multi *in6m; 3770 #endif 3771 3772 for (ia = V_in6_ifaddr; ia; ia = ia->ia_next) { 3773 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3774 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3775 return 1; 3776 3777 #if 0 3778 /* 3779 * XXX Multicast 3780 * XXX why do we care about multlicast here while we don't care 3781 * about IPv4 multicast?? 3782 * XXX scope 3783 */ 3784 in6m = NULL; 3785 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3786 if (in6m) 3787 return 1; 3788 #endif 3789 } 3790 3791 /* loopback, just for safety */ 3792 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3793 return 1; 3794 3795 return 0; 3796 } 3797 #endif /*INET6*/ 3798 3799 /* 3800 * compare two secasindex structure. 3801 * flag can specify to compare 2 saidxes. 3802 * compare two secasindex structure without both mode and reqid. 3803 * don't compare port. 3804 * IN: 3805 * saidx0: source, it can be in SAD. 3806 * saidx1: object. 3807 * OUT: 3808 * 1 : equal 3809 * 0 : not equal 3810 */ 3811 static int 3812 key_cmpsaidx( 3813 const struct secasindex *saidx0, 3814 const struct secasindex *saidx1, 3815 int flag) 3816 { 3817 /* sanity */ 3818 if (saidx0 == NULL && saidx1 == NULL) 3819 return 1; 3820 3821 if (saidx0 == NULL || saidx1 == NULL) 3822 return 0; 3823 3824 if (saidx0->proto != saidx1->proto) 3825 return 0; 3826 3827 if (flag == CMP_EXACTLY) { 3828 if (saidx0->mode != saidx1->mode) 3829 return 0; 3830 if (saidx0->reqid != saidx1->reqid) 3831 return 0; 3832 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3833 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3834 return 0; 3835 } else { 3836 3837 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3838 if (flag == CMP_MODE_REQID 3839 ||flag == CMP_REQID) { 3840 /* 3841 * If reqid of SPD is non-zero, unique SA is required. 3842 * The result must be of same reqid in this case. 3843 */ 3844 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3845 return 0; 3846 } 3847 3848 if (flag == CMP_MODE_REQID) { 3849 if (saidx0->mode != IPSEC_MODE_ANY 3850 && saidx0->mode != saidx1->mode) 3851 return 0; 3852 } 3853 3854 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3855 return 0; 3856 } 3857 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3858 return 0; 3859 } 3860 } 3861 3862 return 1; 3863 } 3864 3865 /* 3866 * compare two secindex structure exactly. 3867 * IN: 3868 * spidx0: source, it is often in SPD. 3869 * spidx1: object, it is often from PFKEY message. 3870 * OUT: 3871 * 1 : equal 3872 * 0 : not equal 3873 */ 3874 static int 3875 key_cmpspidx_exactly( 3876 struct secpolicyindex *spidx0, 3877 struct secpolicyindex *spidx1) 3878 { 3879 /* sanity */ 3880 if (spidx0 == NULL && spidx1 == NULL) 3881 return 1; 3882 3883 if (spidx0 == NULL || spidx1 == NULL) 3884 return 0; 3885 3886 if (spidx0->prefs != spidx1->prefs 3887 || spidx0->prefd != spidx1->prefd 3888 || spidx0->ul_proto != spidx1->ul_proto) 3889 return 0; 3890 3891 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3892 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3893 } 3894 3895 /* 3896 * compare two secindex structure with mask. 3897 * IN: 3898 * spidx0: source, it is often in SPD. 3899 * spidx1: object, it is often from IP header. 3900 * OUT: 3901 * 1 : equal 3902 * 0 : not equal 3903 */ 3904 static int 3905 key_cmpspidx_withmask( 3906 struct secpolicyindex *spidx0, 3907 struct secpolicyindex *spidx1) 3908 { 3909 /* sanity */ 3910 if (spidx0 == NULL && spidx1 == NULL) 3911 return 1; 3912 3913 if (spidx0 == NULL || spidx1 == NULL) 3914 return 0; 3915 3916 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3917 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3918 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3919 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3920 return 0; 3921 3922 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3923 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3924 && spidx0->ul_proto != spidx1->ul_proto) 3925 return 0; 3926 3927 switch (spidx0->src.sa.sa_family) { 3928 case AF_INET: 3929 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3930 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3931 return 0; 3932 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3933 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3934 return 0; 3935 break; 3936 case AF_INET6: 3937 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3938 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3939 return 0; 3940 /* 3941 * scope_id check. if sin6_scope_id is 0, we regard it 3942 * as a wildcard scope, which matches any scope zone ID. 3943 */ 3944 if (spidx0->src.sin6.sin6_scope_id && 3945 spidx1->src.sin6.sin6_scope_id && 3946 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3947 return 0; 3948 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3949 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3950 return 0; 3951 break; 3952 default: 3953 /* XXX */ 3954 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3955 return 0; 3956 break; 3957 } 3958 3959 switch (spidx0->dst.sa.sa_family) { 3960 case AF_INET: 3961 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3962 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3963 return 0; 3964 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3965 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3966 return 0; 3967 break; 3968 case AF_INET6: 3969 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3970 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3971 return 0; 3972 /* 3973 * scope_id check. if sin6_scope_id is 0, we regard it 3974 * as a wildcard scope, which matches any scope zone ID. 3975 */ 3976 if (spidx0->dst.sin6.sin6_scope_id && 3977 spidx1->dst.sin6.sin6_scope_id && 3978 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3979 return 0; 3980 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3981 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3982 return 0; 3983 break; 3984 default: 3985 /* XXX */ 3986 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3987 return 0; 3988 break; 3989 } 3990 3991 /* XXX Do we check other field ? e.g. flowinfo */ 3992 3993 return 1; 3994 } 3995 3996 /* returns 0 on match */ 3997 static int 3998 key_sockaddrcmp( 3999 const struct sockaddr *sa1, 4000 const struct sockaddr *sa2, 4001 int port) 4002 { 4003 #ifdef satosin 4004 #undef satosin 4005 #endif 4006 #define satosin(s) ((const struct sockaddr_in *)s) 4007 #ifdef satosin6 4008 #undef satosin6 4009 #endif 4010 #define satosin6(s) ((const struct sockaddr_in6 *)s) 4011 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4012 return 1; 4013 4014 switch (sa1->sa_family) { 4015 case AF_INET: 4016 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4017 return 1; 4018 if (satosin(sa1)->sin_addr.s_addr != 4019 satosin(sa2)->sin_addr.s_addr) { 4020 return 1; 4021 } 4022 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4023 return 1; 4024 break; 4025 case AF_INET6: 4026 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4027 return 1; /*EINVAL*/ 4028 if (satosin6(sa1)->sin6_scope_id != 4029 satosin6(sa2)->sin6_scope_id) { 4030 return 1; 4031 } 4032 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4033 &satosin6(sa2)->sin6_addr)) { 4034 return 1; 4035 } 4036 if (port && 4037 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4038 return 1; 4039 } 4040 break; 4041 default: 4042 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4043 return 1; 4044 break; 4045 } 4046 4047 return 0; 4048 #undef satosin 4049 #undef satosin6 4050 } 4051 4052 /* 4053 * compare two buffers with mask. 4054 * IN: 4055 * addr1: source 4056 * addr2: object 4057 * bits: Number of bits to compare 4058 * OUT: 4059 * 1 : equal 4060 * 0 : not equal 4061 */ 4062 static int 4063 key_bbcmp(const void *a1, const void *a2, u_int bits) 4064 { 4065 const unsigned char *p1 = a1; 4066 const unsigned char *p2 = a2; 4067 4068 /* XXX: This could be considerably faster if we compare a word 4069 * at a time, but it is complicated on LSB Endian machines */ 4070 4071 /* Handle null pointers */ 4072 if (p1 == NULL || p2 == NULL) 4073 return (p1 == p2); 4074 4075 while (bits >= 8) { 4076 if (*p1++ != *p2++) 4077 return 0; 4078 bits -= 8; 4079 } 4080 4081 if (bits > 0) { 4082 u_int8_t mask = ~((1<<(8-bits))-1); 4083 if ((*p1 & mask) != (*p2 & mask)) 4084 return 0; 4085 } 4086 return 1; /* Match! */ 4087 } 4088 4089 static void 4090 key_flush_spd(time_t now) 4091 { 4092 INIT_VNET_IPSEC(curvnet); 4093 static u_int16_t sptree_scangen = 0; 4094 u_int16_t gen = sptree_scangen++; 4095 struct secpolicy *sp; 4096 u_int dir; 4097 4098 /* SPD */ 4099 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4100 restart: 4101 SPTREE_LOCK(); 4102 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4103 if (sp->scangen == gen) /* previously handled */ 4104 continue; 4105 sp->scangen = gen; 4106 if (sp->state == IPSEC_SPSTATE_DEAD) { 4107 /* NB: clean entries created by key_spdflush */ 4108 SPTREE_UNLOCK(); 4109 KEY_FREESP(&sp); 4110 goto restart; 4111 } 4112 if (sp->lifetime == 0 && sp->validtime == 0) 4113 continue; 4114 if ((sp->lifetime && now - sp->created > sp->lifetime) 4115 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4116 sp->state = IPSEC_SPSTATE_DEAD; 4117 SPTREE_UNLOCK(); 4118 key_spdexpire(sp); 4119 KEY_FREESP(&sp); 4120 goto restart; 4121 } 4122 } 4123 SPTREE_UNLOCK(); 4124 } 4125 } 4126 4127 static void 4128 key_flush_sad(time_t now) 4129 { 4130 INIT_VNET_IPSEC(curvnet); 4131 struct secashead *sah, *nextsah; 4132 struct secasvar *sav, *nextsav; 4133 4134 /* SAD */ 4135 SAHTREE_LOCK(); 4136 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4137 /* if sah has been dead, then delete it and process next sah. */ 4138 if (sah->state == SADB_SASTATE_DEAD) { 4139 key_delsah(sah); 4140 continue; 4141 } 4142 4143 /* if LARVAL entry doesn't become MATURE, delete it. */ 4144 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4145 /* Need to also check refcnt for a larval SA ??? */ 4146 if (now - sav->created > V_key_larval_lifetime) 4147 KEY_FREESAV(&sav); 4148 } 4149 4150 /* 4151 * check MATURE entry to start to send expire message 4152 * whether or not. 4153 */ 4154 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4155 /* we don't need to check. */ 4156 if (sav->lft_s == NULL) 4157 continue; 4158 4159 /* sanity check */ 4160 if (sav->lft_c == NULL) { 4161 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4162 "time, why?\n", __func__)); 4163 continue; 4164 } 4165 4166 /* check SOFT lifetime */ 4167 if (sav->lft_s->addtime != 0 && 4168 now - sav->created > sav->lft_s->addtime) { 4169 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4170 /* 4171 * Actually, only send expire message if 4172 * SA has been used, as it was done before, 4173 * but should we always send such message, 4174 * and let IKE daemon decide if it should be 4175 * renegotiated or not ? 4176 * XXX expire message will actually NOT be 4177 * sent if SA is only used after soft 4178 * lifetime has been reached, see below 4179 * (DYING state) 4180 */ 4181 if (sav->lft_c->usetime != 0) 4182 key_expire(sav); 4183 } 4184 /* check SOFT lifetime by bytes */ 4185 /* 4186 * XXX I don't know the way to delete this SA 4187 * when new SA is installed. Caution when it's 4188 * installed too big lifetime by time. 4189 */ 4190 else if (sav->lft_s->bytes != 0 && 4191 sav->lft_s->bytes < sav->lft_c->bytes) { 4192 4193 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4194 /* 4195 * XXX If we keep to send expire 4196 * message in the status of 4197 * DYING. Do remove below code. 4198 */ 4199 key_expire(sav); 4200 } 4201 } 4202 4203 /* check DYING entry to change status to DEAD. */ 4204 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4205 /* we don't need to check. */ 4206 if (sav->lft_h == NULL) 4207 continue; 4208 4209 /* sanity check */ 4210 if (sav->lft_c == NULL) { 4211 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4212 "time, why?\n", __func__)); 4213 continue; 4214 } 4215 4216 if (sav->lft_h->addtime != 0 && 4217 now - sav->created > sav->lft_h->addtime) { 4218 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4219 KEY_FREESAV(&sav); 4220 } 4221 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4222 else if (sav->lft_s != NULL 4223 && sav->lft_s->addtime != 0 4224 && now - sav->created > sav->lft_s->addtime) { 4225 /* 4226 * XXX: should be checked to be 4227 * installed the valid SA. 4228 */ 4229 4230 /* 4231 * If there is no SA then sending 4232 * expire message. 4233 */ 4234 key_expire(sav); 4235 } 4236 #endif 4237 /* check HARD lifetime by bytes */ 4238 else if (sav->lft_h->bytes != 0 && 4239 sav->lft_h->bytes < sav->lft_c->bytes) { 4240 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4241 KEY_FREESAV(&sav); 4242 } 4243 } 4244 4245 /* delete entry in DEAD */ 4246 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4247 /* sanity check */ 4248 if (sav->state != SADB_SASTATE_DEAD) { 4249 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4250 "(queue: %d SA: %d): kill it anyway\n", 4251 __func__, 4252 SADB_SASTATE_DEAD, sav->state)); 4253 } 4254 /* 4255 * do not call key_freesav() here. 4256 * sav should already be freed, and sav->refcnt 4257 * shows other references to sav 4258 * (such as from SPD). 4259 */ 4260 } 4261 } 4262 SAHTREE_UNLOCK(); 4263 } 4264 4265 static void 4266 key_flush_acq(time_t now) 4267 { 4268 INIT_VNET_IPSEC(curvnet); 4269 struct secacq *acq, *nextacq; 4270 4271 /* ACQ tree */ 4272 ACQ_LOCK(); 4273 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4274 nextacq = LIST_NEXT(acq, chain); 4275 if (now - acq->created > V_key_blockacq_lifetime 4276 && __LIST_CHAINED(acq)) { 4277 LIST_REMOVE(acq, chain); 4278 free(acq, M_IPSEC_SAQ); 4279 } 4280 } 4281 ACQ_UNLOCK(); 4282 } 4283 4284 static void 4285 key_flush_spacq(time_t now) 4286 { 4287 INIT_VNET_IPSEC(curvnet); 4288 struct secspacq *acq, *nextacq; 4289 4290 /* SP ACQ tree */ 4291 SPACQ_LOCK(); 4292 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4293 nextacq = LIST_NEXT(acq, chain); 4294 if (now - acq->created > V_key_blockacq_lifetime 4295 && __LIST_CHAINED(acq)) { 4296 LIST_REMOVE(acq, chain); 4297 free(acq, M_IPSEC_SAQ); 4298 } 4299 } 4300 SPACQ_UNLOCK(); 4301 } 4302 4303 /* 4304 * time handler. 4305 * scanning SPD and SAD to check status for each entries, 4306 * and do to remove or to expire. 4307 * XXX: year 2038 problem may remain. 4308 */ 4309 void 4310 key_timehandler(void) 4311 { 4312 VNET_ITERATOR_DECL(vnet_iter); 4313 time_t now = time_second; 4314 4315 VNET_LIST_RLOCK(); 4316 VNET_FOREACH(vnet_iter) { 4317 CURVNET_SET(vnet_iter); 4318 key_flush_spd(now); 4319 key_flush_sad(now); 4320 key_flush_acq(now); 4321 key_flush_spacq(now); 4322 CURVNET_RESTORE(); 4323 } 4324 VNET_LIST_RUNLOCK(); 4325 4326 #ifndef IPSEC_DEBUG2 4327 /* do exchange to tick time !! */ 4328 (void)timeout((void *)key_timehandler, (void *)0, hz); 4329 #endif /* IPSEC_DEBUG2 */ 4330 } 4331 4332 u_long 4333 key_random() 4334 { 4335 u_long value; 4336 4337 key_randomfill(&value, sizeof(value)); 4338 return value; 4339 } 4340 4341 void 4342 key_randomfill(p, l) 4343 void *p; 4344 size_t l; 4345 { 4346 size_t n; 4347 u_long v; 4348 static int warn = 1; 4349 4350 n = 0; 4351 n = (size_t)read_random(p, (u_int)l); 4352 /* last resort */ 4353 while (n < l) { 4354 v = random(); 4355 bcopy(&v, (u_int8_t *)p + n, 4356 l - n < sizeof(v) ? l - n : sizeof(v)); 4357 n += sizeof(v); 4358 4359 if (warn) { 4360 printf("WARNING: pseudo-random number generator " 4361 "used for IPsec processing\n"); 4362 warn = 0; 4363 } 4364 } 4365 } 4366 4367 /* 4368 * map SADB_SATYPE_* to IPPROTO_*. 4369 * if satype == SADB_SATYPE then satype is mapped to ~0. 4370 * OUT: 4371 * 0: invalid satype. 4372 */ 4373 static u_int16_t 4374 key_satype2proto(u_int8_t satype) 4375 { 4376 switch (satype) { 4377 case SADB_SATYPE_UNSPEC: 4378 return IPSEC_PROTO_ANY; 4379 case SADB_SATYPE_AH: 4380 return IPPROTO_AH; 4381 case SADB_SATYPE_ESP: 4382 return IPPROTO_ESP; 4383 case SADB_X_SATYPE_IPCOMP: 4384 return IPPROTO_IPCOMP; 4385 case SADB_X_SATYPE_TCPSIGNATURE: 4386 return IPPROTO_TCP; 4387 default: 4388 return 0; 4389 } 4390 /* NOTREACHED */ 4391 } 4392 4393 /* 4394 * map IPPROTO_* to SADB_SATYPE_* 4395 * OUT: 4396 * 0: invalid protocol type. 4397 */ 4398 static u_int8_t 4399 key_proto2satype(u_int16_t proto) 4400 { 4401 switch (proto) { 4402 case IPPROTO_AH: 4403 return SADB_SATYPE_AH; 4404 case IPPROTO_ESP: 4405 return SADB_SATYPE_ESP; 4406 case IPPROTO_IPCOMP: 4407 return SADB_X_SATYPE_IPCOMP; 4408 case IPPROTO_TCP: 4409 return SADB_X_SATYPE_TCPSIGNATURE; 4410 default: 4411 return 0; 4412 } 4413 /* NOTREACHED */ 4414 } 4415 4416 /* %%% PF_KEY */ 4417 /* 4418 * SADB_GETSPI processing is to receive 4419 * <base, (SA2), src address, dst address, (SPI range)> 4420 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4421 * tree with the status of LARVAL, and send 4422 * <base, SA(*), address(SD)> 4423 * to the IKMPd. 4424 * 4425 * IN: mhp: pointer to the pointer to each header. 4426 * OUT: NULL if fail. 4427 * other if success, return pointer to the message to send. 4428 */ 4429 static int 4430 key_getspi(so, m, mhp) 4431 struct socket *so; 4432 struct mbuf *m; 4433 const struct sadb_msghdr *mhp; 4434 { 4435 INIT_VNET_IPSEC(curvnet); 4436 struct sadb_address *src0, *dst0; 4437 struct secasindex saidx; 4438 struct secashead *newsah; 4439 struct secasvar *newsav; 4440 u_int8_t proto; 4441 u_int32_t spi; 4442 u_int8_t mode; 4443 u_int32_t reqid; 4444 int error; 4445 4446 IPSEC_ASSERT(so != NULL, ("null socket")); 4447 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4448 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4449 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4450 4451 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4452 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4453 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4454 __func__)); 4455 return key_senderror(so, m, EINVAL); 4456 } 4457 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4458 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4459 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4460 __func__)); 4461 return key_senderror(so, m, EINVAL); 4462 } 4463 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4464 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4465 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4466 } else { 4467 mode = IPSEC_MODE_ANY; 4468 reqid = 0; 4469 } 4470 4471 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4472 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4473 4474 /* map satype to proto */ 4475 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4476 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4477 __func__)); 4478 return key_senderror(so, m, EINVAL); 4479 } 4480 4481 /* make sure if port number is zero. */ 4482 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4483 case AF_INET: 4484 if (((struct sockaddr *)(src0 + 1))->sa_len != 4485 sizeof(struct sockaddr_in)) 4486 return key_senderror(so, m, EINVAL); 4487 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4488 break; 4489 case AF_INET6: 4490 if (((struct sockaddr *)(src0 + 1))->sa_len != 4491 sizeof(struct sockaddr_in6)) 4492 return key_senderror(so, m, EINVAL); 4493 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4494 break; 4495 default: 4496 ; /*???*/ 4497 } 4498 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4499 case AF_INET: 4500 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4501 sizeof(struct sockaddr_in)) 4502 return key_senderror(so, m, EINVAL); 4503 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4504 break; 4505 case AF_INET6: 4506 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4507 sizeof(struct sockaddr_in6)) 4508 return key_senderror(so, m, EINVAL); 4509 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4510 break; 4511 default: 4512 ; /*???*/ 4513 } 4514 4515 /* XXX boundary check against sa_len */ 4516 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4517 4518 /* SPI allocation */ 4519 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4520 &saidx); 4521 if (spi == 0) 4522 return key_senderror(so, m, EINVAL); 4523 4524 /* get a SA index */ 4525 if ((newsah = key_getsah(&saidx)) == NULL) { 4526 /* create a new SA index */ 4527 if ((newsah = key_newsah(&saidx)) == NULL) { 4528 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4529 return key_senderror(so, m, ENOBUFS); 4530 } 4531 } 4532 4533 /* get a new SA */ 4534 /* XXX rewrite */ 4535 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4536 if (newsav == NULL) { 4537 /* XXX don't free new SA index allocated in above. */ 4538 return key_senderror(so, m, error); 4539 } 4540 4541 /* set spi */ 4542 newsav->spi = htonl(spi); 4543 4544 /* delete the entry in acqtree */ 4545 if (mhp->msg->sadb_msg_seq != 0) { 4546 struct secacq *acq; 4547 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4548 /* reset counter in order to deletion by timehandler. */ 4549 acq->created = time_second; 4550 acq->count = 0; 4551 } 4552 } 4553 4554 { 4555 struct mbuf *n, *nn; 4556 struct sadb_sa *m_sa; 4557 struct sadb_msg *newmsg; 4558 int off, len; 4559 4560 /* create new sadb_msg to reply. */ 4561 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4562 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4563 4564 MGETHDR(n, M_DONTWAIT, MT_DATA); 4565 if (len > MHLEN) { 4566 MCLGET(n, M_DONTWAIT); 4567 if ((n->m_flags & M_EXT) == 0) { 4568 m_freem(n); 4569 n = NULL; 4570 } 4571 } 4572 if (!n) 4573 return key_senderror(so, m, ENOBUFS); 4574 4575 n->m_len = len; 4576 n->m_next = NULL; 4577 off = 0; 4578 4579 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4580 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4581 4582 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4583 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4584 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4585 m_sa->sadb_sa_spi = htonl(spi); 4586 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4587 4588 IPSEC_ASSERT(off == len, 4589 ("length inconsistency (off %u len %u)", off, len)); 4590 4591 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4592 SADB_EXT_ADDRESS_DST); 4593 if (!n->m_next) { 4594 m_freem(n); 4595 return key_senderror(so, m, ENOBUFS); 4596 } 4597 4598 if (n->m_len < sizeof(struct sadb_msg)) { 4599 n = m_pullup(n, sizeof(struct sadb_msg)); 4600 if (n == NULL) 4601 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4602 } 4603 4604 n->m_pkthdr.len = 0; 4605 for (nn = n; nn; nn = nn->m_next) 4606 n->m_pkthdr.len += nn->m_len; 4607 4608 newmsg = mtod(n, struct sadb_msg *); 4609 newmsg->sadb_msg_seq = newsav->seq; 4610 newmsg->sadb_msg_errno = 0; 4611 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4612 4613 m_freem(m); 4614 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4615 } 4616 } 4617 4618 /* 4619 * allocating new SPI 4620 * called by key_getspi(). 4621 * OUT: 4622 * 0: failure. 4623 * others: success. 4624 */ 4625 static u_int32_t 4626 key_do_getnewspi(spirange, saidx) 4627 struct sadb_spirange *spirange; 4628 struct secasindex *saidx; 4629 { 4630 INIT_VNET_IPSEC(curvnet); 4631 u_int32_t newspi; 4632 u_int32_t min, max; 4633 int count = V_key_spi_trycnt; 4634 4635 /* set spi range to allocate */ 4636 if (spirange != NULL) { 4637 min = spirange->sadb_spirange_min; 4638 max = spirange->sadb_spirange_max; 4639 } else { 4640 min = V_key_spi_minval; 4641 max = V_key_spi_maxval; 4642 } 4643 /* IPCOMP needs 2-byte SPI */ 4644 if (saidx->proto == IPPROTO_IPCOMP) { 4645 u_int32_t t; 4646 if (min >= 0x10000) 4647 min = 0xffff; 4648 if (max >= 0x10000) 4649 max = 0xffff; 4650 if (min > max) { 4651 t = min; min = max; max = t; 4652 } 4653 } 4654 4655 if (min == max) { 4656 if (key_checkspidup(saidx, min) != NULL) { 4657 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4658 __func__, min)); 4659 return 0; 4660 } 4661 4662 count--; /* taking one cost. */ 4663 newspi = min; 4664 4665 } else { 4666 4667 /* init SPI */ 4668 newspi = 0; 4669 4670 /* when requesting to allocate spi ranged */ 4671 while (count--) { 4672 /* generate pseudo-random SPI value ranged. */ 4673 newspi = min + (key_random() % (max - min + 1)); 4674 4675 if (key_checkspidup(saidx, newspi) == NULL) 4676 break; 4677 } 4678 4679 if (count == 0 || newspi == 0) { 4680 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4681 __func__)); 4682 return 0; 4683 } 4684 } 4685 4686 /* statistics */ 4687 keystat.getspi_count = 4688 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4689 4690 return newspi; 4691 } 4692 4693 /* 4694 * SADB_UPDATE processing 4695 * receive 4696 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4697 * key(AE), (identity(SD),) (sensitivity)> 4698 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4699 * and send 4700 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4701 * (identity(SD),) (sensitivity)> 4702 * to the ikmpd. 4703 * 4704 * m will always be freed. 4705 */ 4706 static int 4707 key_update(so, m, mhp) 4708 struct socket *so; 4709 struct mbuf *m; 4710 const struct sadb_msghdr *mhp; 4711 { 4712 INIT_VNET_IPSEC(curvnet); 4713 struct sadb_sa *sa0; 4714 struct sadb_address *src0, *dst0; 4715 struct secasindex saidx; 4716 struct secashead *sah; 4717 struct secasvar *sav; 4718 u_int16_t proto; 4719 u_int8_t mode; 4720 u_int32_t reqid; 4721 int error; 4722 4723 IPSEC_ASSERT(so != NULL, ("null socket")); 4724 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4725 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4726 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4727 4728 /* map satype to proto */ 4729 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4730 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4731 __func__)); 4732 return key_senderror(so, m, EINVAL); 4733 } 4734 4735 if (mhp->ext[SADB_EXT_SA] == NULL || 4736 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4737 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4738 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4739 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4740 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4741 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4742 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4743 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4744 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4745 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4746 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4747 __func__)); 4748 return key_senderror(so, m, EINVAL); 4749 } 4750 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4751 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4752 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4753 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4754 __func__)); 4755 return key_senderror(so, m, EINVAL); 4756 } 4757 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4758 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4759 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4760 } else { 4761 mode = IPSEC_MODE_ANY; 4762 reqid = 0; 4763 } 4764 /* XXX boundary checking for other extensions */ 4765 4766 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4767 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4768 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4769 4770 /* XXX boundary check against sa_len */ 4771 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4772 4773 /* get a SA header */ 4774 if ((sah = key_getsah(&saidx)) == NULL) { 4775 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4776 return key_senderror(so, m, ENOENT); 4777 } 4778 4779 /* set spidx if there */ 4780 /* XXX rewrite */ 4781 error = key_setident(sah, m, mhp); 4782 if (error) 4783 return key_senderror(so, m, error); 4784 4785 /* find a SA with sequence number. */ 4786 #ifdef IPSEC_DOSEQCHECK 4787 if (mhp->msg->sadb_msg_seq != 0 4788 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4789 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4790 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4791 return key_senderror(so, m, ENOENT); 4792 } 4793 #else 4794 SAHTREE_LOCK(); 4795 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4796 SAHTREE_UNLOCK(); 4797 if (sav == NULL) { 4798 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4799 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4800 return key_senderror(so, m, EINVAL); 4801 } 4802 #endif 4803 4804 /* validity check */ 4805 if (sav->sah->saidx.proto != proto) { 4806 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4807 "(DB=%u param=%u)\n", __func__, 4808 sav->sah->saidx.proto, proto)); 4809 return key_senderror(so, m, EINVAL); 4810 } 4811 #ifdef IPSEC_DOSEQCHECK 4812 if (sav->spi != sa0->sadb_sa_spi) { 4813 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4814 __func__, 4815 (u_int32_t)ntohl(sav->spi), 4816 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4817 return key_senderror(so, m, EINVAL); 4818 } 4819 #endif 4820 if (sav->pid != mhp->msg->sadb_msg_pid) { 4821 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 4822 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 4823 return key_senderror(so, m, EINVAL); 4824 } 4825 4826 /* copy sav values */ 4827 error = key_setsaval(sav, m, mhp); 4828 if (error) { 4829 KEY_FREESAV(&sav); 4830 return key_senderror(so, m, error); 4831 } 4832 4833 /* check SA values to be mature. */ 4834 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4835 KEY_FREESAV(&sav); 4836 return key_senderror(so, m, 0); 4837 } 4838 4839 { 4840 struct mbuf *n; 4841 4842 /* set msg buf from mhp */ 4843 n = key_getmsgbuf_x1(m, mhp); 4844 if (n == NULL) { 4845 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4846 return key_senderror(so, m, ENOBUFS); 4847 } 4848 4849 m_freem(m); 4850 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4851 } 4852 } 4853 4854 /* 4855 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4856 * only called by key_update(). 4857 * OUT: 4858 * NULL : not found 4859 * others : found, pointer to a SA. 4860 */ 4861 #ifdef IPSEC_DOSEQCHECK 4862 static struct secasvar * 4863 key_getsavbyseq(sah, seq) 4864 struct secashead *sah; 4865 u_int32_t seq; 4866 { 4867 struct secasvar *sav; 4868 u_int state; 4869 4870 state = SADB_SASTATE_LARVAL; 4871 4872 /* search SAD with sequence number ? */ 4873 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4874 4875 KEY_CHKSASTATE(state, sav->state, __func__); 4876 4877 if (sav->seq == seq) { 4878 sa_addref(sav); 4879 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4880 printf("DP %s cause refcnt++:%d SA:%p\n", 4881 __func__, sav->refcnt, sav)); 4882 return sav; 4883 } 4884 } 4885 4886 return NULL; 4887 } 4888 #endif 4889 4890 /* 4891 * SADB_ADD processing 4892 * add an entry to SA database, when received 4893 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4894 * key(AE), (identity(SD),) (sensitivity)> 4895 * from the ikmpd, 4896 * and send 4897 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4898 * (identity(SD),) (sensitivity)> 4899 * to the ikmpd. 4900 * 4901 * IGNORE identity and sensitivity messages. 4902 * 4903 * m will always be freed. 4904 */ 4905 static int 4906 key_add(so, m, mhp) 4907 struct socket *so; 4908 struct mbuf *m; 4909 const struct sadb_msghdr *mhp; 4910 { 4911 INIT_VNET_IPSEC(curvnet); 4912 struct sadb_sa *sa0; 4913 struct sadb_address *src0, *dst0; 4914 struct secasindex saidx; 4915 struct secashead *newsah; 4916 struct secasvar *newsav; 4917 u_int16_t proto; 4918 u_int8_t mode; 4919 u_int32_t reqid; 4920 int error; 4921 4922 IPSEC_ASSERT(so != NULL, ("null socket")); 4923 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4924 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4925 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4926 4927 /* map satype to proto */ 4928 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4929 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4930 __func__)); 4931 return key_senderror(so, m, EINVAL); 4932 } 4933 4934 if (mhp->ext[SADB_EXT_SA] == NULL || 4935 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4936 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4937 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4938 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4939 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4940 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4941 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4942 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4943 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4944 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4945 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4946 __func__)); 4947 return key_senderror(so, m, EINVAL); 4948 } 4949 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4950 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4951 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4952 /* XXX need more */ 4953 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4954 __func__)); 4955 return key_senderror(so, m, EINVAL); 4956 } 4957 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4958 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4959 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4960 } else { 4961 mode = IPSEC_MODE_ANY; 4962 reqid = 0; 4963 } 4964 4965 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4966 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4967 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4968 4969 /* XXX boundary check against sa_len */ 4970 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4971 4972 /* get a SA header */ 4973 if ((newsah = key_getsah(&saidx)) == NULL) { 4974 /* create a new SA header */ 4975 if ((newsah = key_newsah(&saidx)) == NULL) { 4976 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4977 return key_senderror(so, m, ENOBUFS); 4978 } 4979 } 4980 4981 /* set spidx if there */ 4982 /* XXX rewrite */ 4983 error = key_setident(newsah, m, mhp); 4984 if (error) { 4985 return key_senderror(so, m, error); 4986 } 4987 4988 /* create new SA entry. */ 4989 /* We can create new SA only if SPI is differenct. */ 4990 SAHTREE_LOCK(); 4991 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 4992 SAHTREE_UNLOCK(); 4993 if (newsav != NULL) { 4994 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 4995 return key_senderror(so, m, EEXIST); 4996 } 4997 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4998 if (newsav == NULL) { 4999 return key_senderror(so, m, error); 5000 } 5001 5002 /* check SA values to be mature. */ 5003 if ((error = key_mature(newsav)) != 0) { 5004 KEY_FREESAV(&newsav); 5005 return key_senderror(so, m, error); 5006 } 5007 5008 /* 5009 * don't call key_freesav() here, as we would like to keep the SA 5010 * in the database on success. 5011 */ 5012 5013 { 5014 struct mbuf *n; 5015 5016 /* set msg buf from mhp */ 5017 n = key_getmsgbuf_x1(m, mhp); 5018 if (n == NULL) { 5019 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5020 return key_senderror(so, m, ENOBUFS); 5021 } 5022 5023 m_freem(m); 5024 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5025 } 5026 } 5027 5028 /* m is retained */ 5029 static int 5030 key_setident(sah, m, mhp) 5031 struct secashead *sah; 5032 struct mbuf *m; 5033 const struct sadb_msghdr *mhp; 5034 { 5035 INIT_VNET_IPSEC(curvnet); 5036 const struct sadb_ident *idsrc, *iddst; 5037 int idsrclen, iddstlen; 5038 5039 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5040 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5041 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5042 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5043 5044 /* don't make buffer if not there */ 5045 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5046 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5047 sah->idents = NULL; 5048 sah->identd = NULL; 5049 return 0; 5050 } 5051 5052 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5053 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5054 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5055 return EINVAL; 5056 } 5057 5058 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5059 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5060 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5061 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5062 5063 /* validity check */ 5064 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5065 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5066 return EINVAL; 5067 } 5068 5069 switch (idsrc->sadb_ident_type) { 5070 case SADB_IDENTTYPE_PREFIX: 5071 case SADB_IDENTTYPE_FQDN: 5072 case SADB_IDENTTYPE_USERFQDN: 5073 default: 5074 /* XXX do nothing */ 5075 sah->idents = NULL; 5076 sah->identd = NULL; 5077 return 0; 5078 } 5079 5080 /* make structure */ 5081 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5082 if (sah->idents == NULL) { 5083 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5084 return ENOBUFS; 5085 } 5086 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5087 if (sah->identd == NULL) { 5088 free(sah->idents, M_IPSEC_MISC); 5089 sah->idents = NULL; 5090 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5091 return ENOBUFS; 5092 } 5093 sah->idents->type = idsrc->sadb_ident_type; 5094 sah->idents->id = idsrc->sadb_ident_id; 5095 5096 sah->identd->type = iddst->sadb_ident_type; 5097 sah->identd->id = iddst->sadb_ident_id; 5098 5099 return 0; 5100 } 5101 5102 /* 5103 * m will not be freed on return. 5104 * it is caller's responsibility to free the result. 5105 */ 5106 static struct mbuf * 5107 key_getmsgbuf_x1(m, mhp) 5108 struct mbuf *m; 5109 const struct sadb_msghdr *mhp; 5110 { 5111 struct mbuf *n; 5112 5113 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5114 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5115 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5116 5117 /* create new sadb_msg to reply. */ 5118 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5119 SADB_EXT_SA, SADB_X_EXT_SA2, 5120 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5121 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5122 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5123 if (!n) 5124 return NULL; 5125 5126 if (n->m_len < sizeof(struct sadb_msg)) { 5127 n = m_pullup(n, sizeof(struct sadb_msg)); 5128 if (n == NULL) 5129 return NULL; 5130 } 5131 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5132 mtod(n, struct sadb_msg *)->sadb_msg_len = 5133 PFKEY_UNIT64(n->m_pkthdr.len); 5134 5135 return n; 5136 } 5137 5138 static int key_delete_all __P((struct socket *, struct mbuf *, 5139 const struct sadb_msghdr *, u_int16_t)); 5140 5141 /* 5142 * SADB_DELETE processing 5143 * receive 5144 * <base, SA(*), address(SD)> 5145 * from the ikmpd, and set SADB_SASTATE_DEAD, 5146 * and send, 5147 * <base, SA(*), address(SD)> 5148 * to the ikmpd. 5149 * 5150 * m will always be freed. 5151 */ 5152 static int 5153 key_delete(so, m, mhp) 5154 struct socket *so; 5155 struct mbuf *m; 5156 const struct sadb_msghdr *mhp; 5157 { 5158 INIT_VNET_IPSEC(curvnet); 5159 struct sadb_sa *sa0; 5160 struct sadb_address *src0, *dst0; 5161 struct secasindex saidx; 5162 struct secashead *sah; 5163 struct secasvar *sav = NULL; 5164 u_int16_t proto; 5165 5166 IPSEC_ASSERT(so != NULL, ("null socket")); 5167 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5168 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5169 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5170 5171 /* map satype to proto */ 5172 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5173 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5174 __func__)); 5175 return key_senderror(so, m, EINVAL); 5176 } 5177 5178 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5179 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5180 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5181 __func__)); 5182 return key_senderror(so, m, EINVAL); 5183 } 5184 5185 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5186 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5187 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5188 __func__)); 5189 return key_senderror(so, m, EINVAL); 5190 } 5191 5192 if (mhp->ext[SADB_EXT_SA] == NULL) { 5193 /* 5194 * Caller wants us to delete all non-LARVAL SAs 5195 * that match the src/dst. This is used during 5196 * IKE INITIAL-CONTACT. 5197 */ 5198 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5199 return key_delete_all(so, m, mhp, proto); 5200 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5201 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5202 __func__)); 5203 return key_senderror(so, m, EINVAL); 5204 } 5205 5206 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5207 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5208 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5209 5210 /* XXX boundary check against sa_len */ 5211 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5212 5213 /* get a SA header */ 5214 SAHTREE_LOCK(); 5215 LIST_FOREACH(sah, &V_sahtree, chain) { 5216 if (sah->state == SADB_SASTATE_DEAD) 5217 continue; 5218 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5219 continue; 5220 5221 /* get a SA with SPI. */ 5222 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5223 if (sav) 5224 break; 5225 } 5226 if (sah == NULL) { 5227 SAHTREE_UNLOCK(); 5228 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5229 return key_senderror(so, m, ENOENT); 5230 } 5231 5232 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5233 SAHTREE_UNLOCK(); 5234 KEY_FREESAV(&sav); 5235 5236 { 5237 struct mbuf *n; 5238 struct sadb_msg *newmsg; 5239 5240 /* create new sadb_msg to reply. */ 5241 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5242 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5243 if (!n) 5244 return key_senderror(so, m, ENOBUFS); 5245 5246 if (n->m_len < sizeof(struct sadb_msg)) { 5247 n = m_pullup(n, sizeof(struct sadb_msg)); 5248 if (n == NULL) 5249 return key_senderror(so, m, ENOBUFS); 5250 } 5251 newmsg = mtod(n, struct sadb_msg *); 5252 newmsg->sadb_msg_errno = 0; 5253 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5254 5255 m_freem(m); 5256 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5257 } 5258 } 5259 5260 /* 5261 * delete all SAs for src/dst. Called from key_delete(). 5262 */ 5263 static int 5264 key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5265 u_int16_t proto) 5266 { 5267 INIT_VNET_IPSEC(curvnet); 5268 struct sadb_address *src0, *dst0; 5269 struct secasindex saidx; 5270 struct secashead *sah; 5271 struct secasvar *sav, *nextsav; 5272 u_int stateidx, state; 5273 5274 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5275 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5276 5277 /* XXX boundary check against sa_len */ 5278 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5279 5280 SAHTREE_LOCK(); 5281 LIST_FOREACH(sah, &V_sahtree, chain) { 5282 if (sah->state == SADB_SASTATE_DEAD) 5283 continue; 5284 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5285 continue; 5286 5287 /* Delete all non-LARVAL SAs. */ 5288 for (stateidx = 0; 5289 stateidx < _ARRAYLEN(saorder_state_alive); 5290 stateidx++) { 5291 state = saorder_state_alive[stateidx]; 5292 if (state == SADB_SASTATE_LARVAL) 5293 continue; 5294 for (sav = LIST_FIRST(&sah->savtree[state]); 5295 sav != NULL; sav = nextsav) { 5296 nextsav = LIST_NEXT(sav, chain); 5297 /* sanity check */ 5298 if (sav->state != state) { 5299 ipseclog((LOG_DEBUG, "%s: invalid " 5300 "sav->state (queue %d SA %d)\n", 5301 __func__, state, sav->state)); 5302 continue; 5303 } 5304 5305 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5306 KEY_FREESAV(&sav); 5307 } 5308 } 5309 } 5310 SAHTREE_UNLOCK(); 5311 { 5312 struct mbuf *n; 5313 struct sadb_msg *newmsg; 5314 5315 /* create new sadb_msg to reply. */ 5316 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5317 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5318 if (!n) 5319 return key_senderror(so, m, ENOBUFS); 5320 5321 if (n->m_len < sizeof(struct sadb_msg)) { 5322 n = m_pullup(n, sizeof(struct sadb_msg)); 5323 if (n == NULL) 5324 return key_senderror(so, m, ENOBUFS); 5325 } 5326 newmsg = mtod(n, struct sadb_msg *); 5327 newmsg->sadb_msg_errno = 0; 5328 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5329 5330 m_freem(m); 5331 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5332 } 5333 } 5334 5335 /* 5336 * SADB_GET processing 5337 * receive 5338 * <base, SA(*), address(SD)> 5339 * from the ikmpd, and get a SP and a SA to respond, 5340 * and send, 5341 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5342 * (identity(SD),) (sensitivity)> 5343 * to the ikmpd. 5344 * 5345 * m will always be freed. 5346 */ 5347 static int 5348 key_get(so, m, mhp) 5349 struct socket *so; 5350 struct mbuf *m; 5351 const struct sadb_msghdr *mhp; 5352 { 5353 INIT_VNET_IPSEC(curvnet); 5354 struct sadb_sa *sa0; 5355 struct sadb_address *src0, *dst0; 5356 struct secasindex saidx; 5357 struct secashead *sah; 5358 struct secasvar *sav = NULL; 5359 u_int16_t proto; 5360 5361 IPSEC_ASSERT(so != NULL, ("null socket")); 5362 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5363 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5364 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5365 5366 /* map satype to proto */ 5367 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5368 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5369 __func__)); 5370 return key_senderror(so, m, EINVAL); 5371 } 5372 5373 if (mhp->ext[SADB_EXT_SA] == NULL || 5374 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5375 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5376 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5377 __func__)); 5378 return key_senderror(so, m, EINVAL); 5379 } 5380 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5381 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5382 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5383 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5384 __func__)); 5385 return key_senderror(so, m, EINVAL); 5386 } 5387 5388 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5389 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5390 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5391 5392 /* XXX boundary check against sa_len */ 5393 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5394 5395 /* get a SA header */ 5396 SAHTREE_LOCK(); 5397 LIST_FOREACH(sah, &V_sahtree, chain) { 5398 if (sah->state == SADB_SASTATE_DEAD) 5399 continue; 5400 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5401 continue; 5402 5403 /* get a SA with SPI. */ 5404 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5405 if (sav) 5406 break; 5407 } 5408 SAHTREE_UNLOCK(); 5409 if (sah == NULL) { 5410 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5411 return key_senderror(so, m, ENOENT); 5412 } 5413 5414 { 5415 struct mbuf *n; 5416 u_int8_t satype; 5417 5418 /* map proto to satype */ 5419 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5420 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5421 __func__)); 5422 return key_senderror(so, m, EINVAL); 5423 } 5424 5425 /* create new sadb_msg to reply. */ 5426 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5427 mhp->msg->sadb_msg_pid); 5428 if (!n) 5429 return key_senderror(so, m, ENOBUFS); 5430 5431 m_freem(m); 5432 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5433 } 5434 } 5435 5436 /* XXX make it sysctl-configurable? */ 5437 static void 5438 key_getcomb_setlifetime(comb) 5439 struct sadb_comb *comb; 5440 { 5441 5442 comb->sadb_comb_soft_allocations = 1; 5443 comb->sadb_comb_hard_allocations = 1; 5444 comb->sadb_comb_soft_bytes = 0; 5445 comb->sadb_comb_hard_bytes = 0; 5446 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5447 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5448 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5449 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5450 } 5451 5452 /* 5453 * XXX reorder combinations by preference 5454 * XXX no idea if the user wants ESP authentication or not 5455 */ 5456 static struct mbuf * 5457 key_getcomb_esp() 5458 { 5459 INIT_VNET_IPSEC(curvnet); 5460 struct sadb_comb *comb; 5461 struct enc_xform *algo; 5462 struct mbuf *result = NULL, *m, *n; 5463 int encmin; 5464 int i, off, o; 5465 int totlen; 5466 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5467 5468 m = NULL; 5469 for (i = 1; i <= SADB_EALG_MAX; i++) { 5470 algo = esp_algorithm_lookup(i); 5471 if (algo == NULL) 5472 continue; 5473 5474 /* discard algorithms with key size smaller than system min */ 5475 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5476 continue; 5477 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5478 encmin = V_ipsec_esp_keymin; 5479 else 5480 encmin = _BITS(algo->minkey); 5481 5482 if (V_ipsec_esp_auth) 5483 m = key_getcomb_ah(); 5484 else { 5485 IPSEC_ASSERT(l <= MLEN, 5486 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5487 MGET(m, M_DONTWAIT, MT_DATA); 5488 if (m) { 5489 M_ALIGN(m, l); 5490 m->m_len = l; 5491 m->m_next = NULL; 5492 bzero(mtod(m, caddr_t), m->m_len); 5493 } 5494 } 5495 if (!m) 5496 goto fail; 5497 5498 totlen = 0; 5499 for (n = m; n; n = n->m_next) 5500 totlen += n->m_len; 5501 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5502 5503 for (off = 0; off < totlen; off += l) { 5504 n = m_pulldown(m, off, l, &o); 5505 if (!n) { 5506 /* m is already freed */ 5507 goto fail; 5508 } 5509 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5510 bzero(comb, sizeof(*comb)); 5511 key_getcomb_setlifetime(comb); 5512 comb->sadb_comb_encrypt = i; 5513 comb->sadb_comb_encrypt_minbits = encmin; 5514 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5515 } 5516 5517 if (!result) 5518 result = m; 5519 else 5520 m_cat(result, m); 5521 } 5522 5523 return result; 5524 5525 fail: 5526 if (result) 5527 m_freem(result); 5528 return NULL; 5529 } 5530 5531 static void 5532 key_getsizes_ah( 5533 const struct auth_hash *ah, 5534 int alg, 5535 u_int16_t* min, 5536 u_int16_t* max) 5537 { 5538 INIT_VNET_IPSEC(curvnet); 5539 5540 *min = *max = ah->keysize; 5541 if (ah->keysize == 0) { 5542 /* 5543 * Transform takes arbitrary key size but algorithm 5544 * key size is restricted. Enforce this here. 5545 */ 5546 switch (alg) { 5547 case SADB_X_AALG_MD5: *min = *max = 16; break; 5548 case SADB_X_AALG_SHA: *min = *max = 20; break; 5549 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5550 default: 5551 DPRINTF(("%s: unknown AH algorithm %u\n", 5552 __func__, alg)); 5553 break; 5554 } 5555 } 5556 } 5557 5558 /* 5559 * XXX reorder combinations by preference 5560 */ 5561 static struct mbuf * 5562 key_getcomb_ah() 5563 { 5564 INIT_VNET_IPSEC(curvnet); 5565 struct sadb_comb *comb; 5566 struct auth_hash *algo; 5567 struct mbuf *m; 5568 u_int16_t minkeysize, maxkeysize; 5569 int i; 5570 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5571 5572 m = NULL; 5573 for (i = 1; i <= SADB_AALG_MAX; i++) { 5574 #if 1 5575 /* we prefer HMAC algorithms, not old algorithms */ 5576 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5577 continue; 5578 #endif 5579 algo = ah_algorithm_lookup(i); 5580 if (!algo) 5581 continue; 5582 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5583 /* discard algorithms with key size smaller than system min */ 5584 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 5585 continue; 5586 5587 if (!m) { 5588 IPSEC_ASSERT(l <= MLEN, 5589 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5590 MGET(m, M_DONTWAIT, MT_DATA); 5591 if (m) { 5592 M_ALIGN(m, l); 5593 m->m_len = l; 5594 m->m_next = NULL; 5595 } 5596 } else 5597 M_PREPEND(m, l, M_DONTWAIT); 5598 if (!m) 5599 return NULL; 5600 5601 comb = mtod(m, struct sadb_comb *); 5602 bzero(comb, sizeof(*comb)); 5603 key_getcomb_setlifetime(comb); 5604 comb->sadb_comb_auth = i; 5605 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5606 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5607 } 5608 5609 return m; 5610 } 5611 5612 /* 5613 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5614 * XXX reorder combinations by preference 5615 */ 5616 static struct mbuf * 5617 key_getcomb_ipcomp() 5618 { 5619 struct sadb_comb *comb; 5620 struct comp_algo *algo; 5621 struct mbuf *m; 5622 int i; 5623 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5624 5625 m = NULL; 5626 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5627 algo = ipcomp_algorithm_lookup(i); 5628 if (!algo) 5629 continue; 5630 5631 if (!m) { 5632 IPSEC_ASSERT(l <= MLEN, 5633 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5634 MGET(m, M_DONTWAIT, MT_DATA); 5635 if (m) { 5636 M_ALIGN(m, l); 5637 m->m_len = l; 5638 m->m_next = NULL; 5639 } 5640 } else 5641 M_PREPEND(m, l, M_DONTWAIT); 5642 if (!m) 5643 return NULL; 5644 5645 comb = mtod(m, struct sadb_comb *); 5646 bzero(comb, sizeof(*comb)); 5647 key_getcomb_setlifetime(comb); 5648 comb->sadb_comb_encrypt = i; 5649 /* what should we set into sadb_comb_*_{min,max}bits? */ 5650 } 5651 5652 return m; 5653 } 5654 5655 /* 5656 * XXX no way to pass mode (transport/tunnel) to userland 5657 * XXX replay checking? 5658 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5659 */ 5660 static struct mbuf * 5661 key_getprop(saidx) 5662 const struct secasindex *saidx; 5663 { 5664 struct sadb_prop *prop; 5665 struct mbuf *m, *n; 5666 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5667 int totlen; 5668 5669 switch (saidx->proto) { 5670 case IPPROTO_ESP: 5671 m = key_getcomb_esp(); 5672 break; 5673 case IPPROTO_AH: 5674 m = key_getcomb_ah(); 5675 break; 5676 case IPPROTO_IPCOMP: 5677 m = key_getcomb_ipcomp(); 5678 break; 5679 default: 5680 return NULL; 5681 } 5682 5683 if (!m) 5684 return NULL; 5685 M_PREPEND(m, l, M_DONTWAIT); 5686 if (!m) 5687 return NULL; 5688 5689 totlen = 0; 5690 for (n = m; n; n = n->m_next) 5691 totlen += n->m_len; 5692 5693 prop = mtod(m, struct sadb_prop *); 5694 bzero(prop, sizeof(*prop)); 5695 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5696 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5697 prop->sadb_prop_replay = 32; /* XXX */ 5698 5699 return m; 5700 } 5701 5702 /* 5703 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5704 * send 5705 * <base, SA, address(SD), (address(P)), x_policy, 5706 * (identity(SD),) (sensitivity,) proposal> 5707 * to KMD, and expect to receive 5708 * <base> with SADB_ACQUIRE if error occured, 5709 * or 5710 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5711 * from KMD by PF_KEY. 5712 * 5713 * XXX x_policy is outside of RFC2367 (KAME extension). 5714 * XXX sensitivity is not supported. 5715 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5716 * see comment for key_getcomb_ipcomp(). 5717 * 5718 * OUT: 5719 * 0 : succeed 5720 * others: error number 5721 */ 5722 static int 5723 key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5724 { 5725 INIT_VNET_IPSEC(curvnet); 5726 struct mbuf *result = NULL, *m; 5727 struct secacq *newacq; 5728 u_int8_t satype; 5729 int error = -1; 5730 u_int32_t seq; 5731 5732 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 5733 satype = key_proto2satype(saidx->proto); 5734 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 5735 5736 /* 5737 * We never do anything about acquirng SA. There is anather 5738 * solution that kernel blocks to send SADB_ACQUIRE message until 5739 * getting something message from IKEd. In later case, to be 5740 * managed with ACQUIRING list. 5741 */ 5742 /* Get an entry to check whether sending message or not. */ 5743 if ((newacq = key_getacq(saidx)) != NULL) { 5744 if (V_key_blockacq_count < newacq->count) { 5745 /* reset counter and do send message. */ 5746 newacq->count = 0; 5747 } else { 5748 /* increment counter and do nothing. */ 5749 newacq->count++; 5750 return 0; 5751 } 5752 } else { 5753 /* make new entry for blocking to send SADB_ACQUIRE. */ 5754 if ((newacq = key_newacq(saidx)) == NULL) 5755 return ENOBUFS; 5756 } 5757 5758 5759 seq = newacq->seq; 5760 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5761 if (!m) { 5762 error = ENOBUFS; 5763 goto fail; 5764 } 5765 result = m; 5766 5767 /* set sadb_address for saidx's. */ 5768 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5769 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5770 if (!m) { 5771 error = ENOBUFS; 5772 goto fail; 5773 } 5774 m_cat(result, m); 5775 5776 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5777 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5778 if (!m) { 5779 error = ENOBUFS; 5780 goto fail; 5781 } 5782 m_cat(result, m); 5783 5784 /* XXX proxy address (optional) */ 5785 5786 /* set sadb_x_policy */ 5787 if (sp) { 5788 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5789 if (!m) { 5790 error = ENOBUFS; 5791 goto fail; 5792 } 5793 m_cat(result, m); 5794 } 5795 5796 /* XXX identity (optional) */ 5797 #if 0 5798 if (idexttype && fqdn) { 5799 /* create identity extension (FQDN) */ 5800 struct sadb_ident *id; 5801 int fqdnlen; 5802 5803 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5804 id = (struct sadb_ident *)p; 5805 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5806 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5807 id->sadb_ident_exttype = idexttype; 5808 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5809 bcopy(fqdn, id + 1, fqdnlen); 5810 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5811 } 5812 5813 if (idexttype) { 5814 /* create identity extension (USERFQDN) */ 5815 struct sadb_ident *id; 5816 int userfqdnlen; 5817 5818 if (userfqdn) { 5819 /* +1 for terminating-NUL */ 5820 userfqdnlen = strlen(userfqdn) + 1; 5821 } else 5822 userfqdnlen = 0; 5823 id = (struct sadb_ident *)p; 5824 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5825 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5826 id->sadb_ident_exttype = idexttype; 5827 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5828 /* XXX is it correct? */ 5829 if (curproc && curproc->p_cred) 5830 id->sadb_ident_id = curproc->p_cred->p_ruid; 5831 if (userfqdn && userfqdnlen) 5832 bcopy(userfqdn, id + 1, userfqdnlen); 5833 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5834 } 5835 #endif 5836 5837 /* XXX sensitivity (optional) */ 5838 5839 /* create proposal/combination extension */ 5840 m = key_getprop(saidx); 5841 #if 0 5842 /* 5843 * spec conformant: always attach proposal/combination extension, 5844 * the problem is that we have no way to attach it for ipcomp, 5845 * due to the way sadb_comb is declared in RFC2367. 5846 */ 5847 if (!m) { 5848 error = ENOBUFS; 5849 goto fail; 5850 } 5851 m_cat(result, m); 5852 #else 5853 /* 5854 * outside of spec; make proposal/combination extension optional. 5855 */ 5856 if (m) 5857 m_cat(result, m); 5858 #endif 5859 5860 if ((result->m_flags & M_PKTHDR) == 0) { 5861 error = EINVAL; 5862 goto fail; 5863 } 5864 5865 if (result->m_len < sizeof(struct sadb_msg)) { 5866 result = m_pullup(result, sizeof(struct sadb_msg)); 5867 if (result == NULL) { 5868 error = ENOBUFS; 5869 goto fail; 5870 } 5871 } 5872 5873 result->m_pkthdr.len = 0; 5874 for (m = result; m; m = m->m_next) 5875 result->m_pkthdr.len += m->m_len; 5876 5877 mtod(result, struct sadb_msg *)->sadb_msg_len = 5878 PFKEY_UNIT64(result->m_pkthdr.len); 5879 5880 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5881 5882 fail: 5883 if (result) 5884 m_freem(result); 5885 return error; 5886 } 5887 5888 static struct secacq * 5889 key_newacq(const struct secasindex *saidx) 5890 { 5891 INIT_VNET_IPSEC(curvnet); 5892 struct secacq *newacq; 5893 5894 /* get new entry */ 5895 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5896 if (newacq == NULL) { 5897 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5898 return NULL; 5899 } 5900 5901 /* copy secindex */ 5902 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5903 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 5904 newacq->created = time_second; 5905 newacq->count = 0; 5906 5907 /* add to acqtree */ 5908 ACQ_LOCK(); 5909 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 5910 ACQ_UNLOCK(); 5911 5912 return newacq; 5913 } 5914 5915 static struct secacq * 5916 key_getacq(const struct secasindex *saidx) 5917 { 5918 INIT_VNET_IPSEC(curvnet); 5919 struct secacq *acq; 5920 5921 ACQ_LOCK(); 5922 LIST_FOREACH(acq, &V_acqtree, chain) { 5923 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5924 break; 5925 } 5926 ACQ_UNLOCK(); 5927 5928 return acq; 5929 } 5930 5931 static struct secacq * 5932 key_getacqbyseq(seq) 5933 u_int32_t seq; 5934 { 5935 INIT_VNET_IPSEC(curvnet); 5936 struct secacq *acq; 5937 5938 ACQ_LOCK(); 5939 LIST_FOREACH(acq, &V_acqtree, chain) { 5940 if (acq->seq == seq) 5941 break; 5942 } 5943 ACQ_UNLOCK(); 5944 5945 return acq; 5946 } 5947 5948 static struct secspacq * 5949 key_newspacq(spidx) 5950 struct secpolicyindex *spidx; 5951 { 5952 INIT_VNET_IPSEC(curvnet); 5953 struct secspacq *acq; 5954 5955 /* get new entry */ 5956 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5957 if (acq == NULL) { 5958 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5959 return NULL; 5960 } 5961 5962 /* copy secindex */ 5963 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5964 acq->created = time_second; 5965 acq->count = 0; 5966 5967 /* add to spacqtree */ 5968 SPACQ_LOCK(); 5969 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 5970 SPACQ_UNLOCK(); 5971 5972 return acq; 5973 } 5974 5975 static struct secspacq * 5976 key_getspacq(spidx) 5977 struct secpolicyindex *spidx; 5978 { 5979 INIT_VNET_IPSEC(curvnet); 5980 struct secspacq *acq; 5981 5982 SPACQ_LOCK(); 5983 LIST_FOREACH(acq, &V_spacqtree, chain) { 5984 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 5985 /* NB: return holding spacq_lock */ 5986 return acq; 5987 } 5988 } 5989 SPACQ_UNLOCK(); 5990 5991 return NULL; 5992 } 5993 5994 /* 5995 * SADB_ACQUIRE processing, 5996 * in first situation, is receiving 5997 * <base> 5998 * from the ikmpd, and clear sequence of its secasvar entry. 5999 * 6000 * In second situation, is receiving 6001 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6002 * from a user land process, and return 6003 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6004 * to the socket. 6005 * 6006 * m will always be freed. 6007 */ 6008 static int 6009 key_acquire2(so, m, mhp) 6010 struct socket *so; 6011 struct mbuf *m; 6012 const struct sadb_msghdr *mhp; 6013 { 6014 INIT_VNET_IPSEC(curvnet); 6015 const struct sadb_address *src0, *dst0; 6016 struct secasindex saidx; 6017 struct secashead *sah; 6018 u_int16_t proto; 6019 int error; 6020 6021 IPSEC_ASSERT(so != NULL, ("null socket")); 6022 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6023 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6024 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6025 6026 /* 6027 * Error message from KMd. 6028 * We assume that if error was occured in IKEd, the length of PFKEY 6029 * message is equal to the size of sadb_msg structure. 6030 * We do not raise error even if error occured in this function. 6031 */ 6032 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6033 struct secacq *acq; 6034 6035 /* check sequence number */ 6036 if (mhp->msg->sadb_msg_seq == 0) { 6037 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6038 "number.\n", __func__)); 6039 m_freem(m); 6040 return 0; 6041 } 6042 6043 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6044 /* 6045 * the specified larval SA is already gone, or we got 6046 * a bogus sequence number. we can silently ignore it. 6047 */ 6048 m_freem(m); 6049 return 0; 6050 } 6051 6052 /* reset acq counter in order to deletion by timehander. */ 6053 acq->created = time_second; 6054 acq->count = 0; 6055 m_freem(m); 6056 return 0; 6057 } 6058 6059 /* 6060 * This message is from user land. 6061 */ 6062 6063 /* map satype to proto */ 6064 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6065 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6066 __func__)); 6067 return key_senderror(so, m, EINVAL); 6068 } 6069 6070 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6071 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6072 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6073 /* error */ 6074 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6075 __func__)); 6076 return key_senderror(so, m, EINVAL); 6077 } 6078 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6079 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6080 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6081 /* error */ 6082 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6083 __func__)); 6084 return key_senderror(so, m, EINVAL); 6085 } 6086 6087 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6088 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6089 6090 /* XXX boundary check against sa_len */ 6091 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6092 6093 /* get a SA index */ 6094 SAHTREE_LOCK(); 6095 LIST_FOREACH(sah, &V_sahtree, chain) { 6096 if (sah->state == SADB_SASTATE_DEAD) 6097 continue; 6098 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6099 break; 6100 } 6101 SAHTREE_UNLOCK(); 6102 if (sah != NULL) { 6103 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6104 return key_senderror(so, m, EEXIST); 6105 } 6106 6107 error = key_acquire(&saidx, NULL); 6108 if (error != 0) { 6109 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6110 __func__, mhp->msg->sadb_msg_errno)); 6111 return key_senderror(so, m, error); 6112 } 6113 6114 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6115 } 6116 6117 /* 6118 * SADB_REGISTER processing. 6119 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6120 * receive 6121 * <base> 6122 * from the ikmpd, and register a socket to send PF_KEY messages, 6123 * and send 6124 * <base, supported> 6125 * to KMD by PF_KEY. 6126 * If socket is detached, must free from regnode. 6127 * 6128 * m will always be freed. 6129 */ 6130 static int 6131 key_register(so, m, mhp) 6132 struct socket *so; 6133 struct mbuf *m; 6134 const struct sadb_msghdr *mhp; 6135 { 6136 INIT_VNET_IPSEC(curvnet); 6137 struct secreg *reg, *newreg = 0; 6138 6139 IPSEC_ASSERT(so != NULL, ("null socket")); 6140 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6141 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6142 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6143 6144 /* check for invalid register message */ 6145 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6146 return key_senderror(so, m, EINVAL); 6147 6148 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6149 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6150 goto setmsg; 6151 6152 /* check whether existing or not */ 6153 REGTREE_LOCK(); 6154 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6155 if (reg->so == so) { 6156 REGTREE_UNLOCK(); 6157 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6158 __func__)); 6159 return key_senderror(so, m, EEXIST); 6160 } 6161 } 6162 6163 /* create regnode */ 6164 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6165 if (newreg == NULL) { 6166 REGTREE_UNLOCK(); 6167 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6168 return key_senderror(so, m, ENOBUFS); 6169 } 6170 6171 newreg->so = so; 6172 ((struct keycb *)sotorawcb(so))->kp_registered++; 6173 6174 /* add regnode to regtree. */ 6175 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6176 REGTREE_UNLOCK(); 6177 6178 setmsg: 6179 { 6180 struct mbuf *n; 6181 struct sadb_msg *newmsg; 6182 struct sadb_supported *sup; 6183 u_int len, alen, elen; 6184 int off; 6185 int i; 6186 struct sadb_alg *alg; 6187 6188 /* create new sadb_msg to reply. */ 6189 alen = 0; 6190 for (i = 1; i <= SADB_AALG_MAX; i++) { 6191 if (ah_algorithm_lookup(i)) 6192 alen += sizeof(struct sadb_alg); 6193 } 6194 if (alen) 6195 alen += sizeof(struct sadb_supported); 6196 elen = 0; 6197 for (i = 1; i <= SADB_EALG_MAX; i++) { 6198 if (esp_algorithm_lookup(i)) 6199 elen += sizeof(struct sadb_alg); 6200 } 6201 if (elen) 6202 elen += sizeof(struct sadb_supported); 6203 6204 len = sizeof(struct sadb_msg) + alen + elen; 6205 6206 if (len > MCLBYTES) 6207 return key_senderror(so, m, ENOBUFS); 6208 6209 MGETHDR(n, M_DONTWAIT, MT_DATA); 6210 if (len > MHLEN) { 6211 MCLGET(n, M_DONTWAIT); 6212 if ((n->m_flags & M_EXT) == 0) { 6213 m_freem(n); 6214 n = NULL; 6215 } 6216 } 6217 if (!n) 6218 return key_senderror(so, m, ENOBUFS); 6219 6220 n->m_pkthdr.len = n->m_len = len; 6221 n->m_next = NULL; 6222 off = 0; 6223 6224 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6225 newmsg = mtod(n, struct sadb_msg *); 6226 newmsg->sadb_msg_errno = 0; 6227 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6228 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6229 6230 /* for authentication algorithm */ 6231 if (alen) { 6232 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6233 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6234 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6235 off += PFKEY_ALIGN8(sizeof(*sup)); 6236 6237 for (i = 1; i <= SADB_AALG_MAX; i++) { 6238 struct auth_hash *aalgo; 6239 u_int16_t minkeysize, maxkeysize; 6240 6241 aalgo = ah_algorithm_lookup(i); 6242 if (!aalgo) 6243 continue; 6244 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6245 alg->sadb_alg_id = i; 6246 alg->sadb_alg_ivlen = 0; 6247 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6248 alg->sadb_alg_minbits = _BITS(minkeysize); 6249 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6250 off += PFKEY_ALIGN8(sizeof(*alg)); 6251 } 6252 } 6253 6254 /* for encryption algorithm */ 6255 if (elen) { 6256 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6257 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6258 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6259 off += PFKEY_ALIGN8(sizeof(*sup)); 6260 6261 for (i = 1; i <= SADB_EALG_MAX; i++) { 6262 struct enc_xform *ealgo; 6263 6264 ealgo = esp_algorithm_lookup(i); 6265 if (!ealgo) 6266 continue; 6267 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6268 alg->sadb_alg_id = i; 6269 alg->sadb_alg_ivlen = ealgo->blocksize; 6270 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6271 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6272 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6273 } 6274 } 6275 6276 IPSEC_ASSERT(off == len, 6277 ("length assumption failed (off %u len %u)", off, len)); 6278 6279 m_freem(m); 6280 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6281 } 6282 } 6283 6284 /* 6285 * free secreg entry registered. 6286 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6287 */ 6288 void 6289 key_freereg(struct socket *so) 6290 { 6291 INIT_VNET_IPSEC(curvnet); 6292 struct secreg *reg; 6293 int i; 6294 6295 IPSEC_ASSERT(so != NULL, ("NULL so")); 6296 6297 /* 6298 * check whether existing or not. 6299 * check all type of SA, because there is a potential that 6300 * one socket is registered to multiple type of SA. 6301 */ 6302 REGTREE_LOCK(); 6303 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6304 LIST_FOREACH(reg, &V_regtree[i], chain) { 6305 if (reg->so == so && __LIST_CHAINED(reg)) { 6306 LIST_REMOVE(reg, chain); 6307 free(reg, M_IPSEC_SAR); 6308 break; 6309 } 6310 } 6311 } 6312 REGTREE_UNLOCK(); 6313 } 6314 6315 /* 6316 * SADB_EXPIRE processing 6317 * send 6318 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6319 * to KMD by PF_KEY. 6320 * NOTE: We send only soft lifetime extension. 6321 * 6322 * OUT: 0 : succeed 6323 * others : error number 6324 */ 6325 static int 6326 key_expire(struct secasvar *sav) 6327 { 6328 int s; 6329 int satype; 6330 struct mbuf *result = NULL, *m; 6331 int len; 6332 int error = -1; 6333 struct sadb_lifetime *lt; 6334 6335 /* XXX: Why do we lock ? */ 6336 s = splnet(); /*called from softclock()*/ 6337 6338 IPSEC_ASSERT (sav != NULL, ("null sav")); 6339 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6340 6341 /* set msg header */ 6342 satype = key_proto2satype(sav->sah->saidx.proto); 6343 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6344 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6345 if (!m) { 6346 error = ENOBUFS; 6347 goto fail; 6348 } 6349 result = m; 6350 6351 /* create SA extension */ 6352 m = key_setsadbsa(sav); 6353 if (!m) { 6354 error = ENOBUFS; 6355 goto fail; 6356 } 6357 m_cat(result, m); 6358 6359 /* create SA extension */ 6360 m = key_setsadbxsa2(sav->sah->saidx.mode, 6361 sav->replay ? sav->replay->count : 0, 6362 sav->sah->saidx.reqid); 6363 if (!m) { 6364 error = ENOBUFS; 6365 goto fail; 6366 } 6367 m_cat(result, m); 6368 6369 /* create lifetime extension (current and soft) */ 6370 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6371 m = key_alloc_mbuf(len); 6372 if (!m || m->m_next) { /*XXX*/ 6373 if (m) 6374 m_freem(m); 6375 error = ENOBUFS; 6376 goto fail; 6377 } 6378 bzero(mtod(m, caddr_t), len); 6379 lt = mtod(m, struct sadb_lifetime *); 6380 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6381 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6382 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6383 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6384 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6385 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6386 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6387 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6388 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6389 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6390 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6391 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6392 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6393 m_cat(result, m); 6394 6395 /* set sadb_address for source */ 6396 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6397 &sav->sah->saidx.src.sa, 6398 FULLMASK, IPSEC_ULPROTO_ANY); 6399 if (!m) { 6400 error = ENOBUFS; 6401 goto fail; 6402 } 6403 m_cat(result, m); 6404 6405 /* set sadb_address for destination */ 6406 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6407 &sav->sah->saidx.dst.sa, 6408 FULLMASK, IPSEC_ULPROTO_ANY); 6409 if (!m) { 6410 error = ENOBUFS; 6411 goto fail; 6412 } 6413 m_cat(result, m); 6414 6415 if ((result->m_flags & M_PKTHDR) == 0) { 6416 error = EINVAL; 6417 goto fail; 6418 } 6419 6420 if (result->m_len < sizeof(struct sadb_msg)) { 6421 result = m_pullup(result, sizeof(struct sadb_msg)); 6422 if (result == NULL) { 6423 error = ENOBUFS; 6424 goto fail; 6425 } 6426 } 6427 6428 result->m_pkthdr.len = 0; 6429 for (m = result; m; m = m->m_next) 6430 result->m_pkthdr.len += m->m_len; 6431 6432 mtod(result, struct sadb_msg *)->sadb_msg_len = 6433 PFKEY_UNIT64(result->m_pkthdr.len); 6434 6435 splx(s); 6436 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6437 6438 fail: 6439 if (result) 6440 m_freem(result); 6441 splx(s); 6442 return error; 6443 } 6444 6445 /* 6446 * SADB_FLUSH processing 6447 * receive 6448 * <base> 6449 * from the ikmpd, and free all entries in secastree. 6450 * and send, 6451 * <base> 6452 * to the ikmpd. 6453 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6454 * 6455 * m will always be freed. 6456 */ 6457 static int 6458 key_flush(so, m, mhp) 6459 struct socket *so; 6460 struct mbuf *m; 6461 const struct sadb_msghdr *mhp; 6462 { 6463 INIT_VNET_IPSEC(curvnet); 6464 struct sadb_msg *newmsg; 6465 struct secashead *sah, *nextsah; 6466 struct secasvar *sav, *nextsav; 6467 u_int16_t proto; 6468 u_int8_t state; 6469 u_int stateidx; 6470 6471 IPSEC_ASSERT(so != NULL, ("null socket")); 6472 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6473 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6474 6475 /* map satype to proto */ 6476 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6477 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6478 __func__)); 6479 return key_senderror(so, m, EINVAL); 6480 } 6481 6482 /* no SATYPE specified, i.e. flushing all SA. */ 6483 SAHTREE_LOCK(); 6484 for (sah = LIST_FIRST(&V_sahtree); 6485 sah != NULL; 6486 sah = nextsah) { 6487 nextsah = LIST_NEXT(sah, chain); 6488 6489 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6490 && proto != sah->saidx.proto) 6491 continue; 6492 6493 for (stateidx = 0; 6494 stateidx < _ARRAYLEN(saorder_state_alive); 6495 stateidx++) { 6496 state = saorder_state_any[stateidx]; 6497 for (sav = LIST_FIRST(&sah->savtree[state]); 6498 sav != NULL; 6499 sav = nextsav) { 6500 6501 nextsav = LIST_NEXT(sav, chain); 6502 6503 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6504 KEY_FREESAV(&sav); 6505 } 6506 } 6507 6508 sah->state = SADB_SASTATE_DEAD; 6509 } 6510 SAHTREE_UNLOCK(); 6511 6512 if (m->m_len < sizeof(struct sadb_msg) || 6513 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6514 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6515 return key_senderror(so, m, ENOBUFS); 6516 } 6517 6518 if (m->m_next) 6519 m_freem(m->m_next); 6520 m->m_next = NULL; 6521 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6522 newmsg = mtod(m, struct sadb_msg *); 6523 newmsg->sadb_msg_errno = 0; 6524 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6525 6526 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6527 } 6528 6529 /* 6530 * SADB_DUMP processing 6531 * dump all entries including status of DEAD in SAD. 6532 * receive 6533 * <base> 6534 * from the ikmpd, and dump all secasvar leaves 6535 * and send, 6536 * <base> ..... 6537 * to the ikmpd. 6538 * 6539 * m will always be freed. 6540 */ 6541 static int 6542 key_dump(so, m, mhp) 6543 struct socket *so; 6544 struct mbuf *m; 6545 const struct sadb_msghdr *mhp; 6546 { 6547 INIT_VNET_IPSEC(curvnet); 6548 struct secashead *sah; 6549 struct secasvar *sav; 6550 u_int16_t proto; 6551 u_int stateidx; 6552 u_int8_t satype; 6553 u_int8_t state; 6554 int cnt; 6555 struct sadb_msg *newmsg; 6556 struct mbuf *n; 6557 6558 IPSEC_ASSERT(so != NULL, ("null socket")); 6559 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6560 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6561 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6562 6563 /* map satype to proto */ 6564 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6565 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6566 __func__)); 6567 return key_senderror(so, m, EINVAL); 6568 } 6569 6570 /* count sav entries to be sent to the userland. */ 6571 cnt = 0; 6572 SAHTREE_LOCK(); 6573 LIST_FOREACH(sah, &V_sahtree, chain) { 6574 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6575 && proto != sah->saidx.proto) 6576 continue; 6577 6578 for (stateidx = 0; 6579 stateidx < _ARRAYLEN(saorder_state_any); 6580 stateidx++) { 6581 state = saorder_state_any[stateidx]; 6582 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6583 cnt++; 6584 } 6585 } 6586 } 6587 6588 if (cnt == 0) { 6589 SAHTREE_UNLOCK(); 6590 return key_senderror(so, m, ENOENT); 6591 } 6592 6593 /* send this to the userland, one at a time. */ 6594 newmsg = NULL; 6595 LIST_FOREACH(sah, &V_sahtree, chain) { 6596 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6597 && proto != sah->saidx.proto) 6598 continue; 6599 6600 /* map proto to satype */ 6601 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6602 SAHTREE_UNLOCK(); 6603 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 6604 "SAD.\n", __func__)); 6605 return key_senderror(so, m, EINVAL); 6606 } 6607 6608 for (stateidx = 0; 6609 stateidx < _ARRAYLEN(saorder_state_any); 6610 stateidx++) { 6611 state = saorder_state_any[stateidx]; 6612 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6613 n = key_setdumpsa(sav, SADB_DUMP, satype, 6614 --cnt, mhp->msg->sadb_msg_pid); 6615 if (!n) { 6616 SAHTREE_UNLOCK(); 6617 return key_senderror(so, m, ENOBUFS); 6618 } 6619 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6620 } 6621 } 6622 } 6623 SAHTREE_UNLOCK(); 6624 6625 m_freem(m); 6626 return 0; 6627 } 6628 6629 /* 6630 * SADB_X_PROMISC processing 6631 * 6632 * m will always be freed. 6633 */ 6634 static int 6635 key_promisc(so, m, mhp) 6636 struct socket *so; 6637 struct mbuf *m; 6638 const struct sadb_msghdr *mhp; 6639 { 6640 int olen; 6641 6642 IPSEC_ASSERT(so != NULL, ("null socket")); 6643 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6644 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6645 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6646 6647 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6648 6649 if (olen < sizeof(struct sadb_msg)) { 6650 #if 1 6651 return key_senderror(so, m, EINVAL); 6652 #else 6653 m_freem(m); 6654 return 0; 6655 #endif 6656 } else if (olen == sizeof(struct sadb_msg)) { 6657 /* enable/disable promisc mode */ 6658 struct keycb *kp; 6659 6660 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6661 return key_senderror(so, m, EINVAL); 6662 mhp->msg->sadb_msg_errno = 0; 6663 switch (mhp->msg->sadb_msg_satype) { 6664 case 0: 6665 case 1: 6666 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6667 break; 6668 default: 6669 return key_senderror(so, m, EINVAL); 6670 } 6671 6672 /* send the original message back to everyone */ 6673 mhp->msg->sadb_msg_errno = 0; 6674 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6675 } else { 6676 /* send packet as is */ 6677 6678 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6679 6680 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6681 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6682 } 6683 } 6684 6685 static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6686 const struct sadb_msghdr *)) = { 6687 NULL, /* SADB_RESERVED */ 6688 key_getspi, /* SADB_GETSPI */ 6689 key_update, /* SADB_UPDATE */ 6690 key_add, /* SADB_ADD */ 6691 key_delete, /* SADB_DELETE */ 6692 key_get, /* SADB_GET */ 6693 key_acquire2, /* SADB_ACQUIRE */ 6694 key_register, /* SADB_REGISTER */ 6695 NULL, /* SADB_EXPIRE */ 6696 key_flush, /* SADB_FLUSH */ 6697 key_dump, /* SADB_DUMP */ 6698 key_promisc, /* SADB_X_PROMISC */ 6699 NULL, /* SADB_X_PCHANGE */ 6700 key_spdadd, /* SADB_X_SPDUPDATE */ 6701 key_spdadd, /* SADB_X_SPDADD */ 6702 key_spddelete, /* SADB_X_SPDDELETE */ 6703 key_spdget, /* SADB_X_SPDGET */ 6704 NULL, /* SADB_X_SPDACQUIRE */ 6705 key_spddump, /* SADB_X_SPDDUMP */ 6706 key_spdflush, /* SADB_X_SPDFLUSH */ 6707 key_spdadd, /* SADB_X_SPDSETIDX */ 6708 NULL, /* SADB_X_SPDEXPIRE */ 6709 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6710 }; 6711 6712 /* 6713 * parse sadb_msg buffer to process PFKEYv2, 6714 * and create a data to response if needed. 6715 * I think to be dealed with mbuf directly. 6716 * IN: 6717 * msgp : pointer to pointer to a received buffer pulluped. 6718 * This is rewrited to response. 6719 * so : pointer to socket. 6720 * OUT: 6721 * length for buffer to send to user process. 6722 */ 6723 int 6724 key_parse(m, so) 6725 struct mbuf *m; 6726 struct socket *so; 6727 { 6728 INIT_VNET_IPSEC(curvnet); 6729 struct sadb_msg *msg; 6730 struct sadb_msghdr mh; 6731 u_int orglen; 6732 int error; 6733 int target; 6734 6735 IPSEC_ASSERT(so != NULL, ("null socket")); 6736 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6737 6738 #if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6739 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6740 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 6741 kdebug_sadb(msg)); 6742 #endif 6743 6744 if (m->m_len < sizeof(struct sadb_msg)) { 6745 m = m_pullup(m, sizeof(struct sadb_msg)); 6746 if (!m) 6747 return ENOBUFS; 6748 } 6749 msg = mtod(m, struct sadb_msg *); 6750 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6751 target = KEY_SENDUP_ONE; 6752 6753 if ((m->m_flags & M_PKTHDR) == 0 || 6754 m->m_pkthdr.len != m->m_pkthdr.len) { 6755 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 6756 V_pfkeystat.out_invlen++; 6757 error = EINVAL; 6758 goto senderror; 6759 } 6760 6761 if (msg->sadb_msg_version != PF_KEY_V2) { 6762 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 6763 __func__, msg->sadb_msg_version)); 6764 V_pfkeystat.out_invver++; 6765 error = EINVAL; 6766 goto senderror; 6767 } 6768 6769 if (msg->sadb_msg_type > SADB_MAX) { 6770 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6771 __func__, msg->sadb_msg_type)); 6772 V_pfkeystat.out_invmsgtype++; 6773 error = EINVAL; 6774 goto senderror; 6775 } 6776 6777 /* for old-fashioned code - should be nuked */ 6778 if (m->m_pkthdr.len > MCLBYTES) { 6779 m_freem(m); 6780 return ENOBUFS; 6781 } 6782 if (m->m_next) { 6783 struct mbuf *n; 6784 6785 MGETHDR(n, M_DONTWAIT, MT_DATA); 6786 if (n && m->m_pkthdr.len > MHLEN) { 6787 MCLGET(n, M_DONTWAIT); 6788 if ((n->m_flags & M_EXT) == 0) { 6789 m_free(n); 6790 n = NULL; 6791 } 6792 } 6793 if (!n) { 6794 m_freem(m); 6795 return ENOBUFS; 6796 } 6797 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6798 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6799 n->m_next = NULL; 6800 m_freem(m); 6801 m = n; 6802 } 6803 6804 /* align the mbuf chain so that extensions are in contiguous region. */ 6805 error = key_align(m, &mh); 6806 if (error) 6807 return error; 6808 6809 msg = mh.msg; 6810 6811 /* check SA type */ 6812 switch (msg->sadb_msg_satype) { 6813 case SADB_SATYPE_UNSPEC: 6814 switch (msg->sadb_msg_type) { 6815 case SADB_GETSPI: 6816 case SADB_UPDATE: 6817 case SADB_ADD: 6818 case SADB_DELETE: 6819 case SADB_GET: 6820 case SADB_ACQUIRE: 6821 case SADB_EXPIRE: 6822 ipseclog((LOG_DEBUG, "%s: must specify satype " 6823 "when msg type=%u.\n", __func__, 6824 msg->sadb_msg_type)); 6825 V_pfkeystat.out_invsatype++; 6826 error = EINVAL; 6827 goto senderror; 6828 } 6829 break; 6830 case SADB_SATYPE_AH: 6831 case SADB_SATYPE_ESP: 6832 case SADB_X_SATYPE_IPCOMP: 6833 case SADB_X_SATYPE_TCPSIGNATURE: 6834 switch (msg->sadb_msg_type) { 6835 case SADB_X_SPDADD: 6836 case SADB_X_SPDDELETE: 6837 case SADB_X_SPDGET: 6838 case SADB_X_SPDDUMP: 6839 case SADB_X_SPDFLUSH: 6840 case SADB_X_SPDSETIDX: 6841 case SADB_X_SPDUPDATE: 6842 case SADB_X_SPDDELETE2: 6843 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 6844 __func__, msg->sadb_msg_type)); 6845 V_pfkeystat.out_invsatype++; 6846 error = EINVAL; 6847 goto senderror; 6848 } 6849 break; 6850 case SADB_SATYPE_RSVP: 6851 case SADB_SATYPE_OSPFV2: 6852 case SADB_SATYPE_RIPV2: 6853 case SADB_SATYPE_MIP: 6854 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 6855 __func__, msg->sadb_msg_satype)); 6856 V_pfkeystat.out_invsatype++; 6857 error = EOPNOTSUPP; 6858 goto senderror; 6859 case 1: /* XXX: What does it do? */ 6860 if (msg->sadb_msg_type == SADB_X_PROMISC) 6861 break; 6862 /*FALLTHROUGH*/ 6863 default: 6864 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6865 __func__, msg->sadb_msg_satype)); 6866 V_pfkeystat.out_invsatype++; 6867 error = EINVAL; 6868 goto senderror; 6869 } 6870 6871 /* check field of upper layer protocol and address family */ 6872 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6873 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6874 struct sadb_address *src0, *dst0; 6875 u_int plen; 6876 6877 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6878 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6879 6880 /* check upper layer protocol */ 6881 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6882 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 6883 "mismatched.\n", __func__)); 6884 V_pfkeystat.out_invaddr++; 6885 error = EINVAL; 6886 goto senderror; 6887 } 6888 6889 /* check family */ 6890 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6891 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6892 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 6893 __func__)); 6894 V_pfkeystat.out_invaddr++; 6895 error = EINVAL; 6896 goto senderror; 6897 } 6898 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6899 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6900 ipseclog((LOG_DEBUG, "%s: address struct size " 6901 "mismatched.\n", __func__)); 6902 V_pfkeystat.out_invaddr++; 6903 error = EINVAL; 6904 goto senderror; 6905 } 6906 6907 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6908 case AF_INET: 6909 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6910 sizeof(struct sockaddr_in)) { 6911 V_pfkeystat.out_invaddr++; 6912 error = EINVAL; 6913 goto senderror; 6914 } 6915 break; 6916 case AF_INET6: 6917 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6918 sizeof(struct sockaddr_in6)) { 6919 V_pfkeystat.out_invaddr++; 6920 error = EINVAL; 6921 goto senderror; 6922 } 6923 break; 6924 default: 6925 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 6926 __func__)); 6927 V_pfkeystat.out_invaddr++; 6928 error = EAFNOSUPPORT; 6929 goto senderror; 6930 } 6931 6932 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6933 case AF_INET: 6934 plen = sizeof(struct in_addr) << 3; 6935 break; 6936 case AF_INET6: 6937 plen = sizeof(struct in6_addr) << 3; 6938 break; 6939 default: 6940 plen = 0; /*fool gcc*/ 6941 break; 6942 } 6943 6944 /* check max prefix length */ 6945 if (src0->sadb_address_prefixlen > plen || 6946 dst0->sadb_address_prefixlen > plen) { 6947 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 6948 __func__)); 6949 V_pfkeystat.out_invaddr++; 6950 error = EINVAL; 6951 goto senderror; 6952 } 6953 6954 /* 6955 * prefixlen == 0 is valid because there can be a case when 6956 * all addresses are matched. 6957 */ 6958 } 6959 6960 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6961 key_typesw[msg->sadb_msg_type] == NULL) { 6962 V_pfkeystat.out_invmsgtype++; 6963 error = EINVAL; 6964 goto senderror; 6965 } 6966 6967 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6968 6969 senderror: 6970 msg->sadb_msg_errno = error; 6971 return key_sendup_mbuf(so, m, target); 6972 } 6973 6974 static int 6975 key_senderror(so, m, code) 6976 struct socket *so; 6977 struct mbuf *m; 6978 int code; 6979 { 6980 struct sadb_msg *msg; 6981 6982 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6983 ("mbuf too small, len %u", m->m_len)); 6984 6985 msg = mtod(m, struct sadb_msg *); 6986 msg->sadb_msg_errno = code; 6987 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 6988 } 6989 6990 /* 6991 * set the pointer to each header into message buffer. 6992 * m will be freed on error. 6993 * XXX larger-than-MCLBYTES extension? 6994 */ 6995 static int 6996 key_align(m, mhp) 6997 struct mbuf *m; 6998 struct sadb_msghdr *mhp; 6999 { 7000 INIT_VNET_IPSEC(curvnet); 7001 struct mbuf *n; 7002 struct sadb_ext *ext; 7003 size_t off, end; 7004 int extlen; 7005 int toff; 7006 7007 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7008 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7009 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7010 ("mbuf too small, len %u", m->m_len)); 7011 7012 /* initialize */ 7013 bzero(mhp, sizeof(*mhp)); 7014 7015 mhp->msg = mtod(m, struct sadb_msg *); 7016 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7017 7018 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7019 extlen = end; /*just in case extlen is not updated*/ 7020 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7021 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7022 if (!n) { 7023 /* m is already freed */ 7024 return ENOBUFS; 7025 } 7026 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7027 7028 /* set pointer */ 7029 switch (ext->sadb_ext_type) { 7030 case SADB_EXT_SA: 7031 case SADB_EXT_ADDRESS_SRC: 7032 case SADB_EXT_ADDRESS_DST: 7033 case SADB_EXT_ADDRESS_PROXY: 7034 case SADB_EXT_LIFETIME_CURRENT: 7035 case SADB_EXT_LIFETIME_HARD: 7036 case SADB_EXT_LIFETIME_SOFT: 7037 case SADB_EXT_KEY_AUTH: 7038 case SADB_EXT_KEY_ENCRYPT: 7039 case SADB_EXT_IDENTITY_SRC: 7040 case SADB_EXT_IDENTITY_DST: 7041 case SADB_EXT_SENSITIVITY: 7042 case SADB_EXT_PROPOSAL: 7043 case SADB_EXT_SUPPORTED_AUTH: 7044 case SADB_EXT_SUPPORTED_ENCRYPT: 7045 case SADB_EXT_SPIRANGE: 7046 case SADB_X_EXT_POLICY: 7047 case SADB_X_EXT_SA2: 7048 /* duplicate check */ 7049 /* 7050 * XXX Are there duplication payloads of either 7051 * KEY_AUTH or KEY_ENCRYPT ? 7052 */ 7053 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7054 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7055 "%u\n", __func__, ext->sadb_ext_type)); 7056 m_freem(m); 7057 V_pfkeystat.out_dupext++; 7058 return EINVAL; 7059 } 7060 break; 7061 default: 7062 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7063 __func__, ext->sadb_ext_type)); 7064 m_freem(m); 7065 V_pfkeystat.out_invexttype++; 7066 return EINVAL; 7067 } 7068 7069 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7070 7071 if (key_validate_ext(ext, extlen)) { 7072 m_freem(m); 7073 V_pfkeystat.out_invlen++; 7074 return EINVAL; 7075 } 7076 7077 n = m_pulldown(m, off, extlen, &toff); 7078 if (!n) { 7079 /* m is already freed */ 7080 return ENOBUFS; 7081 } 7082 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7083 7084 mhp->ext[ext->sadb_ext_type] = ext; 7085 mhp->extoff[ext->sadb_ext_type] = off; 7086 mhp->extlen[ext->sadb_ext_type] = extlen; 7087 } 7088 7089 if (off != end) { 7090 m_freem(m); 7091 V_pfkeystat.out_invlen++; 7092 return EINVAL; 7093 } 7094 7095 return 0; 7096 } 7097 7098 static int 7099 key_validate_ext(ext, len) 7100 const struct sadb_ext *ext; 7101 int len; 7102 { 7103 const struct sockaddr *sa; 7104 enum { NONE, ADDR } checktype = NONE; 7105 int baselen = 0; 7106 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7107 7108 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7109 return EINVAL; 7110 7111 /* if it does not match minimum/maximum length, bail */ 7112 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7113 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7114 return EINVAL; 7115 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7116 return EINVAL; 7117 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7118 return EINVAL; 7119 7120 /* more checks based on sadb_ext_type XXX need more */ 7121 switch (ext->sadb_ext_type) { 7122 case SADB_EXT_ADDRESS_SRC: 7123 case SADB_EXT_ADDRESS_DST: 7124 case SADB_EXT_ADDRESS_PROXY: 7125 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7126 checktype = ADDR; 7127 break; 7128 case SADB_EXT_IDENTITY_SRC: 7129 case SADB_EXT_IDENTITY_DST: 7130 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7131 SADB_X_IDENTTYPE_ADDR) { 7132 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7133 checktype = ADDR; 7134 } else 7135 checktype = NONE; 7136 break; 7137 default: 7138 checktype = NONE; 7139 break; 7140 } 7141 7142 switch (checktype) { 7143 case NONE: 7144 break; 7145 case ADDR: 7146 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7147 if (len < baselen + sal) 7148 return EINVAL; 7149 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7150 return EINVAL; 7151 break; 7152 } 7153 7154 return 0; 7155 } 7156 7157 void 7158 key_init(void) 7159 { 7160 INIT_VNET_IPSEC(curvnet); 7161 int i; 7162 7163 V_key_debug_level = 0; 7164 V_key_spi_trycnt = 1000; 7165 V_key_spi_minval = 0x100; 7166 V_key_spi_maxval = 0x0fffffff; /* XXX */ 7167 V_policy_id = 0; 7168 V_key_int_random = 60; /*interval to initialize randseed,1(m)*/ 7169 V_key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 7170 V_key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 7171 V_key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 7172 V_key_preferred_oldsa = 1; /* preferred old sa rather than new sa*/ 7173 7174 V_acq_seq = 0; 7175 7176 V_ipsec_esp_keymin = 256; 7177 V_ipsec_esp_auth = 0; 7178 V_ipsec_ah_keymin = 128; 7179 7180 for (i = 0; i < IPSEC_DIR_MAX; i++) 7181 LIST_INIT(&V_sptree[i]); 7182 7183 LIST_INIT(&V_sahtree); 7184 7185 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7186 LIST_INIT(&V_regtree[i]); 7187 7188 LIST_INIT(&V_acqtree); 7189 LIST_INIT(&V_spacqtree); 7190 7191 /* system default */ 7192 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7193 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7194 7195 if (!IS_DEFAULT_VNET(curvnet)) 7196 return; 7197 7198 SPTREE_LOCK_INIT(); 7199 REGTREE_LOCK_INIT(); 7200 SAHTREE_LOCK_INIT(); 7201 ACQ_LOCK_INIT(); 7202 SPACQ_LOCK_INIT(); 7203 7204 #ifndef IPSEC_DEBUG2 7205 timeout((void *)key_timehandler, (void *)0, hz); 7206 #endif /*IPSEC_DEBUG2*/ 7207 7208 /* initialize key statistics */ 7209 keystat.getspi_count = 1; 7210 7211 printf("IPsec: Initialized Security Association Processing.\n"); 7212 7213 return; 7214 } 7215 7216 /* 7217 * XXX: maybe This function is called after INBOUND IPsec processing. 7218 * 7219 * Special check for tunnel-mode packets. 7220 * We must make some checks for consistency between inner and outer IP header. 7221 * 7222 * xxx more checks to be provided 7223 */ 7224 int 7225 key_checktunnelsanity(sav, family, src, dst) 7226 struct secasvar *sav; 7227 u_int family; 7228 caddr_t src; 7229 caddr_t dst; 7230 { 7231 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7232 7233 /* XXX: check inner IP header */ 7234 7235 return 1; 7236 } 7237 7238 /* record data transfer on SA, and update timestamps */ 7239 void 7240 key_sa_recordxfer(sav, m) 7241 struct secasvar *sav; 7242 struct mbuf *m; 7243 { 7244 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7245 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7246 if (!sav->lft_c) 7247 return; 7248 7249 /* 7250 * XXX Currently, there is a difference of bytes size 7251 * between inbound and outbound processing. 7252 */ 7253 sav->lft_c->bytes += m->m_pkthdr.len; 7254 /* to check bytes lifetime is done in key_timehandler(). */ 7255 7256 /* 7257 * We use the number of packets as the unit of 7258 * allocations. We increment the variable 7259 * whenever {esp,ah}_{in,out}put is called. 7260 */ 7261 sav->lft_c->allocations++; 7262 /* XXX check for expires? */ 7263 7264 /* 7265 * NOTE: We record CURRENT usetime by using wall clock, 7266 * in seconds. HARD and SOFT lifetime are measured by the time 7267 * difference (again in seconds) from usetime. 7268 * 7269 * usetime 7270 * v expire expire 7271 * -----+-----+--------+---> t 7272 * <--------------> HARD 7273 * <-----> SOFT 7274 */ 7275 sav->lft_c->usetime = time_second; 7276 /* XXX check for expires? */ 7277 7278 return; 7279 } 7280 7281 /* dumb version */ 7282 void 7283 key_sa_routechange(dst) 7284 struct sockaddr *dst; 7285 { 7286 INIT_VNET_IPSEC(curvnet); 7287 struct secashead *sah; 7288 struct route *ro; 7289 7290 SAHTREE_LOCK(); 7291 LIST_FOREACH(sah, &V_sahtree, chain) { 7292 ro = &sah->sa_route; 7293 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7294 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7295 RTFREE(ro->ro_rt); 7296 ro->ro_rt = (struct rtentry *)NULL; 7297 } 7298 } 7299 SAHTREE_UNLOCK(); 7300 } 7301 7302 static void 7303 key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7304 { 7305 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7306 SAHTREE_LOCK_ASSERT(); 7307 7308 if (sav->state != state) { 7309 if (__LIST_CHAINED(sav)) 7310 LIST_REMOVE(sav, chain); 7311 sav->state = state; 7312 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7313 } 7314 } 7315 7316 void 7317 key_sa_stir_iv(sav) 7318 struct secasvar *sav; 7319 { 7320 7321 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7322 key_randomfill(sav->iv, sav->ivlen); 7323 } 7324 7325 /* XXX too much? */ 7326 static struct mbuf * 7327 key_alloc_mbuf(l) 7328 int l; 7329 { 7330 struct mbuf *m = NULL, *n; 7331 int len, t; 7332 7333 len = l; 7334 while (len > 0) { 7335 MGET(n, M_DONTWAIT, MT_DATA); 7336 if (n && len > MLEN) 7337 MCLGET(n, M_DONTWAIT); 7338 if (!n) { 7339 m_freem(m); 7340 return NULL; 7341 } 7342 7343 n->m_next = NULL; 7344 n->m_len = 0; 7345 n->m_len = M_TRAILINGSPACE(n); 7346 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7347 if (n->m_len > len) { 7348 t = (n->m_len - len) & ~(sizeof(long) - 1); 7349 n->m_data += t; 7350 n->m_len = len; 7351 } 7352 7353 len -= n->m_len; 7354 7355 if (m) 7356 m_cat(m, n); 7357 else 7358 m = n; 7359 } 7360 7361 return m; 7362 } 7363 7364 /* 7365 * Take one of the kernel's security keys and convert it into a PF_KEY 7366 * structure within an mbuf, suitable for sending up to a waiting 7367 * application in user land. 7368 * 7369 * IN: 7370 * src: A pointer to a kernel security key. 7371 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7372 * OUT: 7373 * a valid mbuf or NULL indicating an error 7374 * 7375 */ 7376 7377 static struct mbuf * 7378 key_setkey(struct seckey *src, u_int16_t exttype) 7379 { 7380 struct mbuf *m; 7381 struct sadb_key *p; 7382 int len; 7383 7384 if (src == NULL) 7385 return NULL; 7386 7387 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7388 m = key_alloc_mbuf(len); 7389 if (m == NULL) 7390 return NULL; 7391 p = mtod(m, struct sadb_key *); 7392 bzero(p, len); 7393 p->sadb_key_len = PFKEY_UNIT64(len); 7394 p->sadb_key_exttype = exttype; 7395 p->sadb_key_bits = src->bits; 7396 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7397 7398 return m; 7399 } 7400 7401 /* 7402 * Take one of the kernel's lifetime data structures and convert it 7403 * into a PF_KEY structure within an mbuf, suitable for sending up to 7404 * a waiting application in user land. 7405 * 7406 * IN: 7407 * src: A pointer to a kernel lifetime structure. 7408 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7409 * data structures for more information. 7410 * OUT: 7411 * a valid mbuf or NULL indicating an error 7412 * 7413 */ 7414 7415 static struct mbuf * 7416 key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7417 { 7418 struct mbuf *m = NULL; 7419 struct sadb_lifetime *p; 7420 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7421 7422 if (src == NULL) 7423 return NULL; 7424 7425 m = key_alloc_mbuf(len); 7426 if (m == NULL) 7427 return m; 7428 p = mtod(m, struct sadb_lifetime *); 7429 7430 bzero(p, len); 7431 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7432 p->sadb_lifetime_exttype = exttype; 7433 p->sadb_lifetime_allocations = src->allocations; 7434 p->sadb_lifetime_bytes = src->bytes; 7435 p->sadb_lifetime_addtime = src->addtime; 7436 p->sadb_lifetime_usetime = src->usetime; 7437 7438 return m; 7439 7440 } 7441