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sys/netipsec/key.c
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1 /* $FreeBSD: releng/5.1/sys/netipsec/key.c 111119 2003-02-19 05:47:46Z imp $ */ 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/mbuf.h> 46 #include <sys/domain.h> 47 #include <sys/protosw.h> 48 #include <sys/malloc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/sysctl.h> 52 #include <sys/errno.h> 53 #include <sys/proc.h> 54 #include <sys/queue.h> 55 #include <sys/syslog.h> 56 57 #include <net/if.h> 58 #include <net/route.h> 59 #include <net/raw_cb.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/ip.h> 64 #include <netinet/in_var.h> 65 66 #ifdef INET6 67 #include <netinet/ip6.h> 68 #include <netinet6/in6_var.h> 69 #include <netinet6/ip6_var.h> 70 #endif /* INET6 */ 71 72 #ifdef INET 73 #include <netinet/in_pcb.h> 74 #endif 75 #ifdef INET6 76 #include <netinet6/in6_pcb.h> 77 #endif /* INET6 */ 78 79 #include <net/pfkeyv2.h> 80 #include <netipsec/keydb.h> 81 #include <netipsec/key.h> 82 #include <netipsec/keysock.h> 83 #include <netipsec/key_debug.h> 84 85 #include <netipsec/ipsec.h> 86 #ifdef INET6 87 #include <netipsec/ipsec6.h> 88 #endif 89 90 #include <netipsec/xform.h> 91 92 #include <machine/stdarg.h> 93 94 /* randomness */ 95 #include <sys/random.h> 96 97 #include <net/net_osdep.h> 98 99 #define FULLMASK 0xff 100 #define _BITS(bytes) ((bytes) << 3) 101 102 /* 103 * Note on SA reference counting: 104 * - SAs that are not in DEAD state will have (total external reference + 1) 105 * following value in reference count field. they cannot be freed and are 106 * referenced from SA header. 107 * - SAs that are in DEAD state will have (total external reference) 108 * in reference count field. they are ready to be freed. reference from 109 * SA header will be removed in key_delsav(), when the reference count 110 * field hits 0 (= no external reference other than from SA header. 111 */ 112 113 u_int32_t key_debug_level = 0; 114 static u_int key_spi_trycnt = 1000; 115 static u_int32_t key_spi_minval = 0x100; 116 static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */ 117 static u_int32_t policy_id = 0; 118 static u_int key_int_random = 60; /*interval to initialize randseed,1(m)*/ 119 static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 120 static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 121 static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 122 static int key_prefered_oldsa = 1; /* prefered old sa rather than new sa.*/ 123 124 static u_int32_t acq_seq = 0; 125 static int key_tick_init_random = 0; 126 127 static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */ 128 static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ 129 static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; 130 /* registed list */ 131 #ifndef IPSEC_NONBLOCK_ACQUIRE 132 static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ 133 #endif 134 static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ 135 136 /* search order for SAs */ 137 static u_int saorder_state_valid[] = { 138 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 139 /* 140 * This order is important because we must select the oldest SA 141 * for outbound processing. For inbound, This is not important. 142 */ 143 }; 144 static u_int saorder_state_alive[] = { 145 /* except DEAD */ 146 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 147 }; 148 static u_int saorder_state_any[] = { 149 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 150 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 151 }; 152 153 static const int minsize[] = { 154 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 155 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 156 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 157 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 158 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 159 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 160 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 161 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 162 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 163 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 164 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 165 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 166 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 167 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 168 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 169 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 170 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 171 0, /* SADB_X_EXT_KMPRIVATE */ 172 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 173 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 174 }; 175 static const int maxsize[] = { 176 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 177 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 178 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 179 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 180 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 181 0, /* SADB_EXT_ADDRESS_SRC */ 182 0, /* SADB_EXT_ADDRESS_DST */ 183 0, /* SADB_EXT_ADDRESS_PROXY */ 184 0, /* SADB_EXT_KEY_AUTH */ 185 0, /* SADB_EXT_KEY_ENCRYPT */ 186 0, /* SADB_EXT_IDENTITY_SRC */ 187 0, /* SADB_EXT_IDENTITY_DST */ 188 0, /* SADB_EXT_SENSITIVITY */ 189 0, /* SADB_EXT_PROPOSAL */ 190 0, /* SADB_EXT_SUPPORTED_AUTH */ 191 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 192 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 193 0, /* SADB_X_EXT_KMPRIVATE */ 194 0, /* SADB_X_EXT_POLICY */ 195 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 196 }; 197 198 static int ipsec_esp_keymin = 256; 199 static int ipsec_esp_auth = 0; 200 static int ipsec_ah_keymin = 128; 201 202 #ifdef SYSCTL_DECL 203 SYSCTL_DECL(_net_key); 204 #endif 205 206 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \ 207 &key_debug_level, 0, ""); 208 209 /* max count of trial for the decision of spi value */ 210 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \ 211 &key_spi_trycnt, 0, ""); 212 213 /* minimum spi value to allocate automatically. */ 214 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \ 215 &key_spi_minval, 0, ""); 216 217 /* maximun spi value to allocate automatically. */ 218 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \ 219 &key_spi_maxval, 0, ""); 220 221 /* interval to initialize randseed */ 222 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, CTLFLAG_RW, \ 223 &key_int_random, 0, ""); 224 225 /* lifetime for larval SA */ 226 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \ 227 &key_larval_lifetime, 0, ""); 228 229 /* counter for blocking to send SADB_ACQUIRE to IKEd */ 230 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \ 231 &key_blockacq_count, 0, ""); 232 233 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 234 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \ 235 &key_blockacq_lifetime, 0, ""); 236 237 /* ESP auth */ 238 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \ 239 &ipsec_esp_auth, 0, ""); 240 241 /* minimum ESP key length */ 242 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \ 243 &ipsec_esp_keymin, 0, ""); 244 245 /* minimum AH key length */ 246 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \ 247 &ipsec_ah_keymin, 0, ""); 248 249 /* perfered old SA rather than new SA */ 250 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, prefered_oldsa, CTLFLAG_RW,\ 251 &key_prefered_oldsa, 0, ""); 252 253 #ifndef LIST_FOREACH 254 #define LIST_FOREACH(elm, head, field) \ 255 for (elm = LIST_FIRST(head); elm; elm = LIST_NEXT(elm, field)) 256 #endif 257 #define __LIST_CHAINED(elm) \ 258 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 259 #define LIST_INSERT_TAIL(head, elm, type, field) \ 260 do {\ 261 struct type *curelm = LIST_FIRST(head); \ 262 if (curelm == NULL) {\ 263 LIST_INSERT_HEAD(head, elm, field); \ 264 } else { \ 265 while (LIST_NEXT(curelm, field)) \ 266 curelm = LIST_NEXT(curelm, field);\ 267 LIST_INSERT_AFTER(curelm, elm, field);\ 268 }\ 269 } while (0) 270 271 #define KEY_CHKSASTATE(head, sav, name) \ 272 do { \ 273 if ((head) != (sav)) { \ 274 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 275 (name), (head), (sav))); \ 276 continue; \ 277 } \ 278 } while (0) 279 280 #define KEY_CHKSPDIR(head, sp, name) \ 281 do { \ 282 if ((head) != (sp)) { \ 283 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 284 "anyway continue.\n", \ 285 (name), (head), (sp))); \ 286 } \ 287 } while (0) 288 289 MALLOC_DEFINE(M_SECA, "key mgmt", "security associations, key management"); 290 291 #if 1 292 #define KMALLOC(p, t, n) \ 293 ((p) = (t) malloc((unsigned long)(n), M_SECA, M_NOWAIT)) 294 #define KFREE(p) \ 295 free((caddr_t)(p), M_SECA) 296 #else 297 #define KMALLOC(p, t, n) \ 298 do { \ 299 ((p) = (t)malloc((unsigned long)(n), M_SECA, M_NOWAIT)); \ 300 printf("%s %d: %p <- KMALLOC(%s, %d)\n", \ 301 __FILE__, __LINE__, (p), #t, n); \ 302 } while (0) 303 304 #define KFREE(p) \ 305 do { \ 306 printf("%s %d: %p -> KFREE()\n", __FILE__, __LINE__, (p)); \ 307 free((caddr_t)(p), M_SECA); \ 308 } while (0) 309 #endif 310 311 /* 312 * set parameters into secpolicyindex buffer. 313 * Must allocate secpolicyindex buffer passed to this function. 314 */ 315 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 316 do { \ 317 bzero((idx), sizeof(struct secpolicyindex)); \ 318 (idx)->dir = (_dir); \ 319 (idx)->prefs = (ps); \ 320 (idx)->prefd = (pd); \ 321 (idx)->ul_proto = (ulp); \ 322 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 323 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 324 } while (0) 325 326 /* 327 * set parameters into secasindex buffer. 328 * Must allocate secasindex buffer before calling this function. 329 */ 330 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 331 do { \ 332 bzero((idx), sizeof(struct secasindex)); \ 333 (idx)->proto = (p); \ 334 (idx)->mode = (m); \ 335 (idx)->reqid = (r); \ 336 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 337 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 338 } while (0) 339 340 /* key statistics */ 341 struct _keystat { 342 u_long getspi_count; /* the avarage of count to try to get new SPI */ 343 } keystat; 344 345 struct sadb_msghdr { 346 struct sadb_msg *msg; 347 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 348 int extoff[SADB_EXT_MAX + 1]; 349 int extlen[SADB_EXT_MAX + 1]; 350 }; 351 352 static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 353 static void key_freesp_so __P((struct secpolicy **)); 354 static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 355 static void key_delsp __P((struct secpolicy *)); 356 static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 357 static struct secpolicy *key_getspbyid __P((u_int32_t)); 358 static u_int32_t key_newreqid __P((void)); 359 static struct mbuf *key_gather_mbuf __P((struct mbuf *, 360 const struct sadb_msghdr *, int, int, ...)); 361 static int key_spdadd __P((struct socket *, struct mbuf *, 362 const struct sadb_msghdr *)); 363 static u_int32_t key_getnewspid __P((void)); 364 static int key_spddelete __P((struct socket *, struct mbuf *, 365 const struct sadb_msghdr *)); 366 static int key_spddelete2 __P((struct socket *, struct mbuf *, 367 const struct sadb_msghdr *)); 368 static int key_spdget __P((struct socket *, struct mbuf *, 369 const struct sadb_msghdr *)); 370 static int key_spdflush __P((struct socket *, struct mbuf *, 371 const struct sadb_msghdr *)); 372 static int key_spddump __P((struct socket *, struct mbuf *, 373 const struct sadb_msghdr *)); 374 static struct mbuf *key_setdumpsp __P((struct secpolicy *, 375 u_int8_t, u_int32_t, u_int32_t)); 376 static u_int key_getspreqmsglen __P((struct secpolicy *)); 377 static int key_spdexpire __P((struct secpolicy *)); 378 static struct secashead *key_newsah __P((struct secasindex *)); 379 static void key_delsah __P((struct secashead *)); 380 static struct secasvar *key_newsav __P((struct mbuf *, 381 const struct sadb_msghdr *, struct secashead *, int *, 382 const char*, int)); 383 #define KEY_NEWSAV(m, sadb, sah, e) \ 384 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 385 static void key_delsav __P((struct secasvar *)); 386 static struct secashead *key_getsah __P((struct secasindex *)); 387 static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 388 static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 389 static int key_setsaval __P((struct secasvar *, struct mbuf *, 390 const struct sadb_msghdr *)); 391 static int key_mature __P((struct secasvar *)); 392 static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 393 u_int8_t, u_int32_t, u_int32_t)); 394 static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 395 u_int32_t, pid_t, u_int16_t)); 396 static struct mbuf *key_setsadbsa __P((struct secasvar *)); 397 static struct mbuf *key_setsadbaddr __P((u_int16_t, 398 const struct sockaddr *, u_int8_t, u_int16_t)); 399 #if 0 400 static struct mbuf *key_setsadbident __P((u_int16_t, u_int16_t, caddr_t, 401 int, u_int64_t)); 402 #endif 403 static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 404 static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 405 u_int32_t)); 406 static void *key_newbuf __P((const void *, u_int)); 407 #ifdef INET6 408 static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 409 #endif 410 411 /* flags for key_cmpsaidx() */ 412 #define CMP_HEAD 1 /* protocol, addresses. */ 413 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 414 #define CMP_REQID 3 /* additionally HEAD, reaid. */ 415 #define CMP_EXACTLY 4 /* all elements. */ 416 static int key_cmpsaidx 417 __P((const struct secasindex *, const struct secasindex *, int)); 418 419 static int key_cmpspidx_exactly 420 __P((struct secpolicyindex *, struct secpolicyindex *)); 421 static int key_cmpspidx_withmask 422 __P((struct secpolicyindex *, struct secpolicyindex *)); 423 static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 424 static int key_bbcmp __P((const void *, const void *, u_int)); 425 static void key_srandom __P((void)); 426 static u_int16_t key_satype2proto __P((u_int8_t)); 427 static u_int8_t key_proto2satype __P((u_int16_t)); 428 429 static int key_getspi __P((struct socket *, struct mbuf *, 430 const struct sadb_msghdr *)); 431 static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 432 struct secasindex *)); 433 static int key_update __P((struct socket *, struct mbuf *, 434 const struct sadb_msghdr *)); 435 #ifdef IPSEC_DOSEQCHECK 436 static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 437 #endif 438 static int key_add __P((struct socket *, struct mbuf *, 439 const struct sadb_msghdr *)); 440 static int key_setident __P((struct secashead *, struct mbuf *, 441 const struct sadb_msghdr *)); 442 static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 443 const struct sadb_msghdr *)); 444 static int key_delete __P((struct socket *, struct mbuf *, 445 const struct sadb_msghdr *)); 446 static int key_get __P((struct socket *, struct mbuf *, 447 const struct sadb_msghdr *)); 448 449 static void key_getcomb_setlifetime __P((struct sadb_comb *)); 450 static struct mbuf *key_getcomb_esp __P((void)); 451 static struct mbuf *key_getcomb_ah __P((void)); 452 static struct mbuf *key_getcomb_ipcomp __P((void)); 453 static struct mbuf *key_getprop __P((const struct secasindex *)); 454 455 static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 456 #ifndef IPSEC_NONBLOCK_ACQUIRE 457 static struct secacq *key_newacq __P((const struct secasindex *)); 458 static struct secacq *key_getacq __P((const struct secasindex *)); 459 static struct secacq *key_getacqbyseq __P((u_int32_t)); 460 #endif 461 static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 462 static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 463 static int key_acquire2 __P((struct socket *, struct mbuf *, 464 const struct sadb_msghdr *)); 465 static int key_register __P((struct socket *, struct mbuf *, 466 const struct sadb_msghdr *)); 467 static int key_expire __P((struct secasvar *)); 468 static int key_flush __P((struct socket *, struct mbuf *, 469 const struct sadb_msghdr *)); 470 static int key_dump __P((struct socket *, struct mbuf *, 471 const struct sadb_msghdr *)); 472 static int key_promisc __P((struct socket *, struct mbuf *, 473 const struct sadb_msghdr *)); 474 static int key_senderror __P((struct socket *, struct mbuf *, int)); 475 static int key_validate_ext __P((const struct sadb_ext *, int)); 476 static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 477 #if 0 478 static const char *key_getfqdn __P((void)); 479 static const char *key_getuserfqdn __P((void)); 480 #endif 481 static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 482 static struct mbuf *key_alloc_mbuf __P((int)); 483 484 #define SA_ADDREF(p) do { \ 485 (p)->refcnt++; \ 486 KASSERT((p)->refcnt != 0, \ 487 ("SA refcnt overflow at %s:%u", __FILE__, __LINE__)); \ 488 } while (0) 489 #define SA_DELREF(p) do { \ 490 KASSERT((p)->refcnt > 0, \ 491 ("SA refcnt underflow at %s:%u", __FILE__, __LINE__)); \ 492 (p)->refcnt--; \ 493 } while (0) 494 495 #define SP_ADDREF(p) do { \ 496 (p)->refcnt++; \ 497 KASSERT((p)->refcnt != 0, \ 498 ("SP refcnt overflow at %s:%u", __FILE__, __LINE__)); \ 499 } while (0) 500 #define SP_DELREF(p) do { \ 501 KASSERT((p)->refcnt > 0, \ 502 ("SP refcnt underflow at %s:%u", __FILE__, __LINE__)); \ 503 (p)->refcnt--; \ 504 } while (0) 505 506 /* 507 * Return 0 when there are known to be no SP's for the specified 508 * direction. Otherwise return 1. This is used by IPsec code 509 * to optimize performance. 510 */ 511 int 512 key_havesp(u_int dir) 513 { 514 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 515 LIST_FIRST(&sptree[dir]) != NULL : 1); 516 } 517 518 /* %%% IPsec policy management */ 519 /* 520 * allocating a SP for OUTBOUND or INBOUND packet. 521 * Must call key_freesp() later. 522 * OUT: NULL: not found 523 * others: found and return the pointer. 524 */ 525 struct secpolicy * 526 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 527 { 528 struct secpolicy *sp; 529 int s; 530 531 KASSERT(spidx != NULL, ("key_allocsp: null spidx")); 532 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 533 ("key_allocsp: invalid direction %u", dir)); 534 535 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 536 printf("DP key_allocsp from %s:%u\n", where, tag)); 537 538 /* get a SP entry */ 539 s = splnet(); /*called from softclock()*/ 540 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 541 printf("*** objects\n"); 542 kdebug_secpolicyindex(spidx)); 543 544 LIST_FOREACH(sp, &sptree[dir], chain) { 545 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 546 printf("*** in SPD\n"); 547 kdebug_secpolicyindex(&sp->spidx)); 548 549 if (sp->state == IPSEC_SPSTATE_DEAD) 550 continue; 551 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 552 goto found; 553 } 554 sp = NULL; 555 found: 556 if (sp) { 557 /* sanity check */ 558 KEY_CHKSPDIR(sp->spidx.dir, dir, "key_allocsp"); 559 560 /* found a SPD entry */ 561 sp->lastused = time_second; 562 SP_ADDREF(sp); 563 } 564 splx(s); 565 566 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 567 printf("DP key_allocsp return SP:%p (ID=%u) refcnt %u\n", 568 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 569 return sp; 570 } 571 572 /* 573 * allocating a SP for OUTBOUND or INBOUND packet. 574 * Must call key_freesp() later. 575 * OUT: NULL: not found 576 * others: found and return the pointer. 577 */ 578 struct secpolicy * 579 key_allocsp2(u_int32_t spi, 580 union sockaddr_union *dst, 581 u_int8_t proto, 582 u_int dir, 583 const char* where, int tag) 584 { 585 struct secpolicy *sp; 586 int s; 587 588 KASSERT(dst != NULL, ("key_allocsp2: null dst")); 589 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 590 ("key_allocsp2: invalid direction %u", dir)); 591 592 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 593 printf("DP key_allocsp2 from %s:%u\n", where, tag)); 594 595 /* get a SP entry */ 596 s = splnet(); /*called from softclock()*/ 597 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 598 printf("*** objects\n"); 599 printf("spi %u proto %u dir %u\n", spi, proto, dir); 600 kdebug_sockaddr(&dst->sa)); 601 602 LIST_FOREACH(sp, &sptree[dir], chain) { 603 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 604 printf("*** in SPD\n"); 605 kdebug_secpolicyindex(&sp->spidx)); 606 607 if (sp->state == IPSEC_SPSTATE_DEAD) 608 continue; 609 /* compare simple values, then dst address */ 610 if (sp->spidx.ul_proto != proto) 611 continue; 612 /* NB: spi's must exist and match */ 613 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 614 continue; 615 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 616 goto found; 617 } 618 sp = NULL; 619 found: 620 if (sp) { 621 /* sanity check */ 622 KEY_CHKSPDIR(sp->spidx.dir, dir, "key_allocsp2"); 623 624 /* found a SPD entry */ 625 sp->lastused = time_second; 626 SP_ADDREF(sp); 627 } 628 splx(s); 629 630 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 631 printf("DP key_allocsp2 return SP:%p (ID=%u) refcnt %u\n", 632 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 633 return sp; 634 } 635 636 /* 637 * return a policy that matches this particular inbound packet. 638 * XXX slow 639 */ 640 struct secpolicy * 641 key_gettunnel(const struct sockaddr *osrc, 642 const struct sockaddr *odst, 643 const struct sockaddr *isrc, 644 const struct sockaddr *idst, 645 const char* where, int tag) 646 { 647 struct secpolicy *sp; 648 const int dir = IPSEC_DIR_INBOUND; 649 int s; 650 struct ipsecrequest *r1, *r2, *p; 651 struct secpolicyindex spidx; 652 653 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 654 printf("DP key_gettunnel from %s:%u\n", where, tag)); 655 656 if (isrc->sa_family != idst->sa_family) { 657 ipseclog((LOG_ERR, "protocol family mismatched %d != %d\n.", 658 isrc->sa_family, idst->sa_family)); 659 sp = NULL; 660 goto done; 661 } 662 663 s = splnet(); /*called from softclock()*/ 664 LIST_FOREACH(sp, &sptree[dir], chain) { 665 if (sp->state == IPSEC_SPSTATE_DEAD) 666 continue; 667 668 r1 = r2 = NULL; 669 for (p = sp->req; p; p = p->next) { 670 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 671 continue; 672 673 r1 = r2; 674 r2 = p; 675 676 if (!r1) { 677 /* here we look at address matches only */ 678 spidx = sp->spidx; 679 if (isrc->sa_len > sizeof(spidx.src) || 680 idst->sa_len > sizeof(spidx.dst)) 681 continue; 682 bcopy(isrc, &spidx.src, isrc->sa_len); 683 bcopy(idst, &spidx.dst, idst->sa_len); 684 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 685 continue; 686 } else { 687 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 688 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 689 continue; 690 } 691 692 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 693 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 694 continue; 695 696 goto found; 697 } 698 } 699 sp = NULL; 700 found: 701 if (sp) { 702 sp->lastused = time_second; 703 SP_ADDREF(sp); 704 } 705 splx(s); 706 done: 707 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 708 printf("DP key_gettunnel return SP:%p (ID=%u) refcnt %u\n", 709 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 710 return sp; 711 } 712 713 /* 714 * allocating an SA entry for an *OUTBOUND* packet. 715 * checking each request entries in SP, and acquire an SA if need. 716 * OUT: 0: there are valid requests. 717 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 718 */ 719 int 720 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 721 { 722 u_int level; 723 int error; 724 725 KASSERT(isr != NULL, ("key_checkrequest: null isr")); 726 KASSERT(saidx != NULL, ("key_checkrequest: null saidx")); 727 KASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 728 saidx->mode == IPSEC_MODE_TUNNEL, 729 ("key_checkrequest: unexpected policy %u", saidx->mode)); 730 731 /* get current level */ 732 level = ipsec_get_reqlevel(isr); 733 734 /* 735 * XXX guard against protocol callbacks from the crypto 736 * thread as they reference ipsecrequest.sav which we 737 * temporarily null out below. Need to rethink how we 738 * handle bundled SA's in the callback thread. 739 */ 740 #if 0 741 SPLASSERT(net, "key_checkrequest"); 742 #endif 743 #if 0 744 /* 745 * We do allocate new SA only if the state of SA in the holder is 746 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 747 */ 748 if (isr->sav != NULL) { 749 if (isr->sav->sah == NULL) 750 panic("key_checkrequest: sah is null.\n"); 751 if (isr->sav == (struct secasvar *)LIST_FIRST( 752 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 753 KEY_FREESAV(&isr->sav); 754 isr->sav = NULL; 755 } 756 } 757 #else 758 /* 759 * we free any SA stashed in the IPsec request because a different 760 * SA may be involved each time this request is checked, either 761 * because new SAs are being configured, or this request is 762 * associated with an unconnected datagram socket, or this request 763 * is associated with a system default policy. 764 * 765 * The operation may have negative impact to performance. We may 766 * want to check cached SA carefully, rather than picking new SA 767 * every time. 768 */ 769 if (isr->sav != NULL) { 770 KEY_FREESAV(&isr->sav); 771 isr->sav = NULL; 772 } 773 #endif 774 775 /* 776 * new SA allocation if no SA found. 777 * key_allocsa_policy should allocate the oldest SA available. 778 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 779 */ 780 if (isr->sav == NULL) 781 isr->sav = key_allocsa_policy(saidx); 782 783 /* When there is SA. */ 784 if (isr->sav != NULL) { 785 if (isr->sav->state != SADB_SASTATE_MATURE && 786 isr->sav->state != SADB_SASTATE_DYING) 787 return EINVAL; 788 return 0; 789 } 790 791 /* there is no SA */ 792 error = key_acquire(saidx, isr->sp); 793 if (error != 0) { 794 /* XXX What should I do ? */ 795 ipseclog((LOG_DEBUG, "key_checkrequest: error %d returned " 796 "from key_acquire.\n", error)); 797 return error; 798 } 799 800 if (level != IPSEC_LEVEL_REQUIRE) { 801 /* XXX sigh, the interface to this routine is botched */ 802 KASSERT(isr->sav == NULL, ("key_checkrequest: unexpected SA")); 803 return 0; 804 } else { 805 return ENOENT; 806 } 807 } 808 809 /* 810 * allocating a SA for policy entry from SAD. 811 * NOTE: searching SAD of aliving state. 812 * OUT: NULL: not found. 813 * others: found and return the pointer. 814 */ 815 static struct secasvar * 816 key_allocsa_policy(const struct secasindex *saidx) 817 { 818 struct secashead *sah; 819 struct secasvar *sav; 820 u_int stateidx, state; 821 822 LIST_FOREACH(sah, &sahtree, chain) { 823 if (sah->state == SADB_SASTATE_DEAD) 824 continue; 825 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) 826 goto found; 827 } 828 829 return NULL; 830 831 found: 832 833 /* search valid state */ 834 for (stateidx = 0; 835 stateidx < _ARRAYLEN(saorder_state_valid); 836 stateidx++) { 837 838 state = saorder_state_valid[stateidx]; 839 840 sav = key_do_allocsa_policy(sah, state); 841 if (sav != NULL) 842 return sav; 843 } 844 845 return NULL; 846 } 847 848 /* 849 * searching SAD with direction, protocol, mode and state. 850 * called by key_allocsa_policy(). 851 * OUT: 852 * NULL : not found 853 * others : found, pointer to a SA. 854 */ 855 static struct secasvar * 856 key_do_allocsa_policy(struct secashead *sah, u_int state) 857 { 858 struct secasvar *sav, *nextsav, *candidate, *d; 859 860 /* initilize */ 861 candidate = NULL; 862 863 for (sav = LIST_FIRST(&sah->savtree[state]); 864 sav != NULL; 865 sav = nextsav) { 866 867 nextsav = LIST_NEXT(sav, chain); 868 869 /* sanity check */ 870 KEY_CHKSASTATE(sav->state, state, "key_do_allocsa_policy"); 871 872 /* initialize */ 873 if (candidate == NULL) { 874 candidate = sav; 875 continue; 876 } 877 878 /* Which SA is the better ? */ 879 880 /* sanity check 2 */ 881 if (candidate->lft_c == NULL || sav->lft_c == NULL) 882 panic("key_do_allocsa_policy: " 883 "lifetime_current is NULL.\n"); 884 885 /* What the best method is to compare ? */ 886 if (key_prefered_oldsa) { 887 if (candidate->lft_c->sadb_lifetime_addtime > 888 sav->lft_c->sadb_lifetime_addtime) { 889 candidate = sav; 890 } 891 continue; 892 /*NOTREACHED*/ 893 } 894 895 /* prefered new sa rather than old sa */ 896 if (candidate->lft_c->sadb_lifetime_addtime < 897 sav->lft_c->sadb_lifetime_addtime) { 898 d = candidate; 899 candidate = sav; 900 } else 901 d = sav; 902 903 /* 904 * prepared to delete the SA when there is more 905 * suitable candidate and the lifetime of the SA is not 906 * permanent. 907 */ 908 if (d->lft_c->sadb_lifetime_addtime != 0) { 909 struct mbuf *m, *result; 910 911 key_sa_chgstate(d, SADB_SASTATE_DEAD); 912 913 KASSERT(d->refcnt > 0, 914 ("key_do_allocsa_policy: bogus ref count")); 915 m = key_setsadbmsg(SADB_DELETE, 0, 916 d->sah->saidx.proto, 0, 0, d->refcnt - 1); 917 if (!m) 918 goto msgfail; 919 result = m; 920 921 /* set sadb_address for saidx's. */ 922 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 923 &d->sah->saidx.src.sa, 924 d->sah->saidx.src.sa.sa_len << 3, 925 IPSEC_ULPROTO_ANY); 926 if (!m) 927 goto msgfail; 928 m_cat(result, m); 929 930 /* set sadb_address for saidx's. */ 931 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 932 &d->sah->saidx.src.sa, 933 d->sah->saidx.src.sa.sa_len << 3, 934 IPSEC_ULPROTO_ANY); 935 if (!m) 936 goto msgfail; 937 m_cat(result, m); 938 939 /* create SA extension */ 940 m = key_setsadbsa(d); 941 if (!m) 942 goto msgfail; 943 m_cat(result, m); 944 945 if (result->m_len < sizeof(struct sadb_msg)) { 946 result = m_pullup(result, 947 sizeof(struct sadb_msg)); 948 if (result == NULL) 949 goto msgfail; 950 } 951 952 result->m_pkthdr.len = 0; 953 for (m = result; m; m = m->m_next) 954 result->m_pkthdr.len += m->m_len; 955 mtod(result, struct sadb_msg *)->sadb_msg_len = 956 PFKEY_UNIT64(result->m_pkthdr.len); 957 958 if (key_sendup_mbuf(NULL, result, 959 KEY_SENDUP_REGISTERED)) 960 goto msgfail; 961 msgfail: 962 KEY_FREESAV(&d); 963 } 964 } 965 966 if (candidate) { 967 SA_ADDREF(candidate); 968 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 969 printf("DP allocsa_policy cause " 970 "refcnt++:%d SA:%p\n", 971 candidate->refcnt, candidate)); 972 } 973 return candidate; 974 } 975 976 /* 977 * allocating a usable SA entry for a *INBOUND* packet. 978 * Must call key_freesav() later. 979 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 980 * NULL: not found, or error occured. 981 * 982 * In the comparison, no source address is used--for RFC2401 conformance. 983 * To quote, from section 4.1: 984 * A security association is uniquely identified by a triple consisting 985 * of a Security Parameter Index (SPI), an IP Destination Address, and a 986 * security protocol (AH or ESP) identifier. 987 * Note that, however, we do need to keep source address in IPsec SA. 988 * IKE specification and PF_KEY specification do assume that we 989 * keep source address in IPsec SA. We see a tricky situation here. 990 */ 991 struct secasvar * 992 key_allocsa( 993 union sockaddr_union *dst, 994 u_int proto, 995 u_int32_t spi, 996 const char* where, int tag) 997 { 998 struct secashead *sah; 999 struct secasvar *sav; 1000 u_int stateidx, state; 1001 int s; 1002 1003 KASSERT(dst != NULL, ("key_allocsa: null dst address")); 1004 1005 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1006 printf("DP key_allocsa from %s:%u\n", where, tag)); 1007 1008 /* 1009 * searching SAD. 1010 * XXX: to be checked internal IP header somewhere. Also when 1011 * IPsec tunnel packet is received. But ESP tunnel mode is 1012 * encrypted so we can't check internal IP header. 1013 */ 1014 s = splnet(); /*called from softclock()*/ 1015 LIST_FOREACH(sah, &sahtree, chain) { 1016 /* search valid state */ 1017 for (stateidx = 0; 1018 stateidx < _ARRAYLEN(saorder_state_valid); 1019 stateidx++) { 1020 state = saorder_state_valid[stateidx]; 1021 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1022 /* sanity check */ 1023 KEY_CHKSASTATE(sav->state, state, "key_allocsav"); 1024 /* do not return entries w/ unusable state */ 1025 if (sav->state != SADB_SASTATE_MATURE && 1026 sav->state != SADB_SASTATE_DYING) 1027 continue; 1028 if (proto != sav->sah->saidx.proto) 1029 continue; 1030 if (spi != sav->spi) 1031 continue; 1032 #if 0 /* don't check src */ 1033 /* check src address */ 1034 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) 1035 continue; 1036 #endif 1037 /* check dst address */ 1038 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0) 1039 continue; 1040 SA_ADDREF(sav); 1041 goto done; 1042 } 1043 } 1044 } 1045 sav = NULL; 1046 done: 1047 splx(s); 1048 1049 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1050 printf("DP key_allocsa return SA:%p; refcnt %u\n", 1051 sav, sav ? sav->refcnt : 0)); 1052 return sav; 1053 } 1054 1055 /* 1056 * Must be called after calling key_allocsp(). 1057 * For both the packet without socket and key_freeso(). 1058 */ 1059 void 1060 _key_freesp(struct secpolicy **spp, const char* where, int tag) 1061 { 1062 struct secpolicy *sp = *spp; 1063 1064 KASSERT(sp != NULL, ("key_freesp: null sp")); 1065 1066 SP_DELREF(sp); 1067 1068 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1069 printf("DP key_freesp SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1070 sp, sp->id, where, tag, sp->refcnt)); 1071 1072 if (sp->refcnt == 0) { 1073 *spp = NULL; 1074 key_delsp(sp); 1075 } 1076 } 1077 1078 /* 1079 * Must be called after calling key_allocsp(). 1080 * For the packet with socket. 1081 */ 1082 void 1083 key_freeso(struct socket *so) 1084 { 1085 /* sanity check */ 1086 KASSERT(so != NULL, ("key_freeso: null so")); 1087 1088 switch (so->so_proto->pr_domain->dom_family) { 1089 #ifdef INET 1090 case PF_INET: 1091 { 1092 struct inpcb *pcb = sotoinpcb(so); 1093 1094 /* Does it have a PCB ? */ 1095 if (pcb == NULL) 1096 return; 1097 key_freesp_so(&pcb->inp_sp->sp_in); 1098 key_freesp_so(&pcb->inp_sp->sp_out); 1099 } 1100 break; 1101 #endif 1102 #ifdef INET6 1103 case PF_INET6: 1104 { 1105 #ifdef HAVE_NRL_INPCB 1106 struct inpcb *pcb = sotoinpcb(so); 1107 1108 /* Does it have a PCB ? */ 1109 if (pcb == NULL) 1110 return; 1111 key_freesp_so(&pcb->inp_sp->sp_in); 1112 key_freesp_so(&pcb->inp_sp->sp_out); 1113 #else 1114 struct in6pcb *pcb = sotoin6pcb(so); 1115 1116 /* Does it have a PCB ? */ 1117 if (pcb == NULL) 1118 return; 1119 key_freesp_so(&pcb->in6p_sp->sp_in); 1120 key_freesp_so(&pcb->in6p_sp->sp_out); 1121 #endif 1122 } 1123 break; 1124 #endif /* INET6 */ 1125 default: 1126 ipseclog((LOG_DEBUG, "key_freeso: unknown address family=%d.\n", 1127 so->so_proto->pr_domain->dom_family)); 1128 return; 1129 } 1130 } 1131 1132 static void 1133 key_freesp_so(struct secpolicy **sp) 1134 { 1135 KASSERT(sp != NULL && *sp != NULL, ("key_freesp_so: null sp")); 1136 1137 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1138 (*sp)->policy == IPSEC_POLICY_BYPASS) 1139 return; 1140 1141 KASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1142 ("key_freesp_so: invalid policy %u", (*sp)->policy)); 1143 KEY_FREESP(sp); 1144 } 1145 1146 /* 1147 * Must be called after calling key_allocsa(). 1148 * This function is called by key_freesp() to free some SA allocated 1149 * for a policy. 1150 */ 1151 void 1152 key_freesav(struct secasvar **psav, const char* where, int tag) 1153 { 1154 struct secasvar *sav = *psav; 1155 1156 KASSERT(sav != NULL, ("key_freesav: null sav")); 1157 1158 SA_DELREF(sav); 1159 1160 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1161 printf("DP key_freesav SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1162 sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1163 1164 if (sav->refcnt == 0) { 1165 *psav = NULL; 1166 key_delsav(sav); 1167 } 1168 } 1169 1170 /* %%% SPD management */ 1171 /* 1172 * free security policy entry. 1173 */ 1174 static void 1175 key_delsp(struct secpolicy *sp) 1176 { 1177 int s; 1178 1179 KASSERT(sp != NULL, ("key_delsp: null sp")); 1180 1181 sp->state = IPSEC_SPSTATE_DEAD; 1182 1183 KASSERT(sp->refcnt == 0, 1184 ("key_delsp: SP with references deleted (refcnt %u)", 1185 sp->refcnt)); 1186 1187 s = splnet(); /*called from softclock()*/ 1188 /* remove from SP index */ 1189 if (__LIST_CHAINED(sp)) 1190 LIST_REMOVE(sp, chain); 1191 1192 { 1193 struct ipsecrequest *isr = sp->req, *nextisr; 1194 1195 while (isr != NULL) { 1196 if (isr->sav != NULL) { 1197 KEY_FREESAV(&isr->sav); 1198 isr->sav = NULL; 1199 } 1200 1201 nextisr = isr->next; 1202 KFREE(isr); 1203 isr = nextisr; 1204 } 1205 } 1206 1207 KFREE(sp); 1208 1209 splx(s); 1210 } 1211 1212 /* 1213 * search SPD 1214 * OUT: NULL : not found 1215 * others : found, pointer to a SP. 1216 */ 1217 static struct secpolicy * 1218 key_getsp(struct secpolicyindex *spidx) 1219 { 1220 struct secpolicy *sp; 1221 1222 KASSERT(spidx != NULL, ("key_getsp: null spidx")); 1223 1224 LIST_FOREACH(sp, &sptree[spidx->dir], chain) { 1225 if (sp->state == IPSEC_SPSTATE_DEAD) 1226 continue; 1227 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1228 SP_ADDREF(sp); 1229 return sp; 1230 } 1231 } 1232 1233 return NULL; 1234 } 1235 1236 /* 1237 * get SP by index. 1238 * OUT: NULL : not found 1239 * others : found, pointer to a SP. 1240 */ 1241 static struct secpolicy * 1242 key_getspbyid(u_int32_t id) 1243 { 1244 struct secpolicy *sp; 1245 1246 LIST_FOREACH(sp, &sptree[IPSEC_DIR_INBOUND], chain) { 1247 if (sp->state == IPSEC_SPSTATE_DEAD) 1248 continue; 1249 if (sp->id == id) { 1250 SP_ADDREF(sp); 1251 return sp; 1252 } 1253 } 1254 1255 LIST_FOREACH(sp, &sptree[IPSEC_DIR_OUTBOUND], chain) { 1256 if (sp->state == IPSEC_SPSTATE_DEAD) 1257 continue; 1258 if (sp->id == id) { 1259 SP_ADDREF(sp); 1260 return sp; 1261 } 1262 } 1263 1264 return NULL; 1265 } 1266 1267 struct secpolicy * 1268 key_newsp(const char* where, int tag) 1269 { 1270 struct secpolicy *newsp = NULL; 1271 1272 newsp = (struct secpolicy *) 1273 malloc(sizeof(struct secpolicy), M_SECA, M_NOWAIT|M_ZERO); 1274 if (newsp) { 1275 newsp->refcnt = 1; 1276 newsp->req = NULL; 1277 } 1278 1279 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1280 printf("DP key_newsp from %s:%u return SP:%p\n", 1281 where, tag, newsp)); 1282 return newsp; 1283 } 1284 1285 /* 1286 * create secpolicy structure from sadb_x_policy structure. 1287 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1288 * so must be set properly later. 1289 */ 1290 struct secpolicy * 1291 key_msg2sp(xpl0, len, error) 1292 struct sadb_x_policy *xpl0; 1293 size_t len; 1294 int *error; 1295 { 1296 struct secpolicy *newsp; 1297 1298 /* sanity check */ 1299 if (xpl0 == NULL) 1300 panic("key_msg2sp: NULL pointer was passed.\n"); 1301 if (len < sizeof(*xpl0)) 1302 panic("key_msg2sp: invalid length.\n"); 1303 if (len != PFKEY_EXTLEN(xpl0)) { 1304 ipseclog((LOG_DEBUG, "key_msg2sp: Invalid msg length.\n")); 1305 *error = EINVAL; 1306 return NULL; 1307 } 1308 1309 if ((newsp = KEY_NEWSP()) == NULL) { 1310 *error = ENOBUFS; 1311 return NULL; 1312 } 1313 1314 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1315 newsp->policy = xpl0->sadb_x_policy_type; 1316 1317 /* check policy */ 1318 switch (xpl0->sadb_x_policy_type) { 1319 case IPSEC_POLICY_DISCARD: 1320 case IPSEC_POLICY_NONE: 1321 case IPSEC_POLICY_ENTRUST: 1322 case IPSEC_POLICY_BYPASS: 1323 newsp->req = NULL; 1324 break; 1325 1326 case IPSEC_POLICY_IPSEC: 1327 { 1328 int tlen; 1329 struct sadb_x_ipsecrequest *xisr; 1330 struct ipsecrequest **p_isr = &newsp->req; 1331 1332 /* validity check */ 1333 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1334 ipseclog((LOG_DEBUG, 1335 "key_msg2sp: Invalid msg length.\n")); 1336 KEY_FREESP(&newsp); 1337 *error = EINVAL; 1338 return NULL; 1339 } 1340 1341 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1342 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1343 1344 while (tlen > 0) { 1345 /* length check */ 1346 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1347 ipseclog((LOG_DEBUG, "key_msg2sp: " 1348 "invalid ipsecrequest length.\n")); 1349 KEY_FREESP(&newsp); 1350 *error = EINVAL; 1351 return NULL; 1352 } 1353 1354 /* allocate request buffer */ 1355 KMALLOC(*p_isr, struct ipsecrequest *, sizeof(**p_isr)); 1356 if ((*p_isr) == NULL) { 1357 ipseclog((LOG_DEBUG, 1358 "key_msg2sp: No more memory.\n")); 1359 KEY_FREESP(&newsp); 1360 *error = ENOBUFS; 1361 return NULL; 1362 } 1363 bzero(*p_isr, sizeof(**p_isr)); 1364 1365 /* set values */ 1366 (*p_isr)->next = NULL; 1367 1368 switch (xisr->sadb_x_ipsecrequest_proto) { 1369 case IPPROTO_ESP: 1370 case IPPROTO_AH: 1371 case IPPROTO_IPCOMP: 1372 break; 1373 default: 1374 ipseclog((LOG_DEBUG, 1375 "key_msg2sp: invalid proto type=%u\n", 1376 xisr->sadb_x_ipsecrequest_proto)); 1377 KEY_FREESP(&newsp); 1378 *error = EPROTONOSUPPORT; 1379 return NULL; 1380 } 1381 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1382 1383 switch (xisr->sadb_x_ipsecrequest_mode) { 1384 case IPSEC_MODE_TRANSPORT: 1385 case IPSEC_MODE_TUNNEL: 1386 break; 1387 case IPSEC_MODE_ANY: 1388 default: 1389 ipseclog((LOG_DEBUG, 1390 "key_msg2sp: invalid mode=%u\n", 1391 xisr->sadb_x_ipsecrequest_mode)); 1392 KEY_FREESP(&newsp); 1393 *error = EINVAL; 1394 return NULL; 1395 } 1396 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1397 1398 switch (xisr->sadb_x_ipsecrequest_level) { 1399 case IPSEC_LEVEL_DEFAULT: 1400 case IPSEC_LEVEL_USE: 1401 case IPSEC_LEVEL_REQUIRE: 1402 break; 1403 case IPSEC_LEVEL_UNIQUE: 1404 /* validity check */ 1405 /* 1406 * If range violation of reqid, kernel will 1407 * update it, don't refuse it. 1408 */ 1409 if (xisr->sadb_x_ipsecrequest_reqid 1410 > IPSEC_MANUAL_REQID_MAX) { 1411 ipseclog((LOG_DEBUG, 1412 "key_msg2sp: reqid=%d range " 1413 "violation, updated by kernel.\n", 1414 xisr->sadb_x_ipsecrequest_reqid)); 1415 xisr->sadb_x_ipsecrequest_reqid = 0; 1416 } 1417 1418 /* allocate new reqid id if reqid is zero. */ 1419 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1420 u_int32_t reqid; 1421 if ((reqid = key_newreqid()) == 0) { 1422 KEY_FREESP(&newsp); 1423 *error = ENOBUFS; 1424 return NULL; 1425 } 1426 (*p_isr)->saidx.reqid = reqid; 1427 xisr->sadb_x_ipsecrequest_reqid = reqid; 1428 } else { 1429 /* set it for manual keying. */ 1430 (*p_isr)->saidx.reqid = 1431 xisr->sadb_x_ipsecrequest_reqid; 1432 } 1433 break; 1434 1435 default: 1436 ipseclog((LOG_DEBUG, "key_msg2sp: invalid level=%u\n", 1437 xisr->sadb_x_ipsecrequest_level)); 1438 KEY_FREESP(&newsp); 1439 *error = EINVAL; 1440 return NULL; 1441 } 1442 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1443 1444 /* set IP addresses if there */ 1445 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1446 struct sockaddr *paddr; 1447 1448 paddr = (struct sockaddr *)(xisr + 1); 1449 1450 /* validity check */ 1451 if (paddr->sa_len 1452 > sizeof((*p_isr)->saidx.src)) { 1453 ipseclog((LOG_DEBUG, "key_msg2sp: invalid request " 1454 "address length.\n")); 1455 KEY_FREESP(&newsp); 1456 *error = EINVAL; 1457 return NULL; 1458 } 1459 bcopy(paddr, &(*p_isr)->saidx.src, 1460 paddr->sa_len); 1461 1462 paddr = (struct sockaddr *)((caddr_t)paddr 1463 + paddr->sa_len); 1464 1465 /* validity check */ 1466 if (paddr->sa_len 1467 > sizeof((*p_isr)->saidx.dst)) { 1468 ipseclog((LOG_DEBUG, "key_msg2sp: invalid request " 1469 "address length.\n")); 1470 KEY_FREESP(&newsp); 1471 *error = EINVAL; 1472 return NULL; 1473 } 1474 bcopy(paddr, &(*p_isr)->saidx.dst, 1475 paddr->sa_len); 1476 } 1477 1478 (*p_isr)->sav = NULL; 1479 (*p_isr)->sp = newsp; 1480 1481 /* initialization for the next. */ 1482 p_isr = &(*p_isr)->next; 1483 tlen -= xisr->sadb_x_ipsecrequest_len; 1484 1485 /* validity check */ 1486 if (tlen < 0) { 1487 ipseclog((LOG_DEBUG, "key_msg2sp: becoming tlen < 0.\n")); 1488 KEY_FREESP(&newsp); 1489 *error = EINVAL; 1490 return NULL; 1491 } 1492 1493 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1494 + xisr->sadb_x_ipsecrequest_len); 1495 } 1496 } 1497 break; 1498 default: 1499 ipseclog((LOG_DEBUG, "key_msg2sp: invalid policy type.\n")); 1500 KEY_FREESP(&newsp); 1501 *error = EINVAL; 1502 return NULL; 1503 } 1504 1505 *error = 0; 1506 return newsp; 1507 } 1508 1509 static u_int32_t 1510 key_newreqid() 1511 { 1512 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1513 1514 auto_reqid = (auto_reqid == ~0 1515 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1516 1517 /* XXX should be unique check */ 1518 1519 return auto_reqid; 1520 } 1521 1522 /* 1523 * copy secpolicy struct to sadb_x_policy structure indicated. 1524 */ 1525 struct mbuf * 1526 key_sp2msg(sp) 1527 struct secpolicy *sp; 1528 { 1529 struct sadb_x_policy *xpl; 1530 int tlen; 1531 caddr_t p; 1532 struct mbuf *m; 1533 1534 /* sanity check. */ 1535 if (sp == NULL) 1536 panic("key_sp2msg: NULL pointer was passed.\n"); 1537 1538 tlen = key_getspreqmsglen(sp); 1539 1540 m = key_alloc_mbuf(tlen); 1541 if (!m || m->m_next) { /*XXX*/ 1542 if (m) 1543 m_freem(m); 1544 return NULL; 1545 } 1546 1547 m->m_len = tlen; 1548 m->m_next = NULL; 1549 xpl = mtod(m, struct sadb_x_policy *); 1550 bzero(xpl, tlen); 1551 1552 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1553 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1554 xpl->sadb_x_policy_type = sp->policy; 1555 xpl->sadb_x_policy_dir = sp->spidx.dir; 1556 xpl->sadb_x_policy_id = sp->id; 1557 p = (caddr_t)xpl + sizeof(*xpl); 1558 1559 /* if is the policy for ipsec ? */ 1560 if (sp->policy == IPSEC_POLICY_IPSEC) { 1561 struct sadb_x_ipsecrequest *xisr; 1562 struct ipsecrequest *isr; 1563 1564 for (isr = sp->req; isr != NULL; isr = isr->next) { 1565 1566 xisr = (struct sadb_x_ipsecrequest *)p; 1567 1568 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1569 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1570 xisr->sadb_x_ipsecrequest_level = isr->level; 1571 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1572 1573 p += sizeof(*xisr); 1574 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1575 p += isr->saidx.src.sa.sa_len; 1576 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1577 p += isr->saidx.src.sa.sa_len; 1578 1579 xisr->sadb_x_ipsecrequest_len = 1580 PFKEY_ALIGN8(sizeof(*xisr) 1581 + isr->saidx.src.sa.sa_len 1582 + isr->saidx.dst.sa.sa_len); 1583 } 1584 } 1585 1586 return m; 1587 } 1588 1589 /* m will not be freed nor modified */ 1590 static struct mbuf * 1591 #ifdef __STDC__ 1592 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1593 int ndeep, int nitem, ...) 1594 #else 1595 key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1596 struct mbuf *m; 1597 const struct sadb_msghdr *mhp; 1598 int ndeep; 1599 int nitem; 1600 va_dcl 1601 #endif 1602 { 1603 va_list ap; 1604 int idx; 1605 int i; 1606 struct mbuf *result = NULL, *n; 1607 int len; 1608 1609 if (m == NULL || mhp == NULL) 1610 panic("null pointer passed to key_gather"); 1611 1612 va_start(ap, nitem); 1613 for (i = 0; i < nitem; i++) { 1614 idx = va_arg(ap, int); 1615 if (idx < 0 || idx > SADB_EXT_MAX) 1616 goto fail; 1617 /* don't attempt to pull empty extension */ 1618 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1619 continue; 1620 if (idx != SADB_EXT_RESERVED && 1621 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1622 continue; 1623 1624 if (idx == SADB_EXT_RESERVED) { 1625 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1626 #ifdef DIAGNOSTIC 1627 if (len > MHLEN) 1628 panic("assumption failed"); 1629 #endif 1630 MGETHDR(n, M_DONTWAIT, MT_DATA); 1631 if (!n) 1632 goto fail; 1633 n->m_len = len; 1634 n->m_next = NULL; 1635 m_copydata(m, 0, sizeof(struct sadb_msg), 1636 mtod(n, caddr_t)); 1637 } else if (i < ndeep) { 1638 len = mhp->extlen[idx]; 1639 n = key_alloc_mbuf(len); 1640 if (!n || n->m_next) { /*XXX*/ 1641 if (n) 1642 m_freem(n); 1643 goto fail; 1644 } 1645 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1646 mtod(n, caddr_t)); 1647 } else { 1648 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1649 M_DONTWAIT); 1650 } 1651 if (n == NULL) 1652 goto fail; 1653 1654 if (result) 1655 m_cat(result, n); 1656 else 1657 result = n; 1658 } 1659 va_end(ap); 1660 1661 if ((result->m_flags & M_PKTHDR) != 0) { 1662 result->m_pkthdr.len = 0; 1663 for (n = result; n; n = n->m_next) 1664 result->m_pkthdr.len += n->m_len; 1665 } 1666 1667 return result; 1668 1669 fail: 1670 m_freem(result); 1671 return NULL; 1672 } 1673 1674 /* 1675 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1676 * add an entry to SP database, when received 1677 * <base, address(SD), (lifetime(H),) policy> 1678 * from the user(?). 1679 * Adding to SP database, 1680 * and send 1681 * <base, address(SD), (lifetime(H),) policy> 1682 * to the socket which was send. 1683 * 1684 * SPDADD set a unique policy entry. 1685 * SPDSETIDX like SPDADD without a part of policy requests. 1686 * SPDUPDATE replace a unique policy entry. 1687 * 1688 * m will always be freed. 1689 */ 1690 static int 1691 key_spdadd(so, m, mhp) 1692 struct socket *so; 1693 struct mbuf *m; 1694 const struct sadb_msghdr *mhp; 1695 { 1696 struct sadb_address *src0, *dst0; 1697 struct sadb_x_policy *xpl0, *xpl; 1698 struct sadb_lifetime *lft = NULL; 1699 struct secpolicyindex spidx; 1700 struct secpolicy *newsp; 1701 int error; 1702 1703 /* sanity check */ 1704 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 1705 panic("key_spdadd: NULL pointer is passed.\n"); 1706 1707 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1708 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1709 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1710 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1711 return key_senderror(so, m, EINVAL); 1712 } 1713 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1714 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1715 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1716 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1717 return key_senderror(so, m, EINVAL); 1718 } 1719 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1720 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1721 < sizeof(struct sadb_lifetime)) { 1722 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1723 return key_senderror(so, m, EINVAL); 1724 } 1725 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1726 } 1727 1728 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1729 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1730 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1731 1732 /* make secindex */ 1733 /* XXX boundary check against sa_len */ 1734 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1735 src0 + 1, 1736 dst0 + 1, 1737 src0->sadb_address_prefixlen, 1738 dst0->sadb_address_prefixlen, 1739 src0->sadb_address_proto, 1740 &spidx); 1741 1742 /* checking the direciton. */ 1743 switch (xpl0->sadb_x_policy_dir) { 1744 case IPSEC_DIR_INBOUND: 1745 case IPSEC_DIR_OUTBOUND: 1746 break; 1747 default: 1748 ipseclog((LOG_DEBUG, "key_spdadd: Invalid SP direction.\n")); 1749 mhp->msg->sadb_msg_errno = EINVAL; 1750 return 0; 1751 } 1752 1753 /* check policy */ 1754 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1755 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1756 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1757 ipseclog((LOG_DEBUG, "key_spdadd: Invalid policy type.\n")); 1758 return key_senderror(so, m, EINVAL); 1759 } 1760 1761 /* policy requests are mandatory when action is ipsec. */ 1762 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1763 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1764 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1765 ipseclog((LOG_DEBUG, "key_spdadd: some policy requests part required.\n")); 1766 return key_senderror(so, m, EINVAL); 1767 } 1768 1769 /* 1770 * checking there is SP already or not. 1771 * SPDUPDATE doesn't depend on whether there is a SP or not. 1772 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1773 * then error. 1774 */ 1775 newsp = key_getsp(&spidx); 1776 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1777 if (newsp) { 1778 newsp->state = IPSEC_SPSTATE_DEAD; 1779 KEY_FREESP(&newsp); 1780 } 1781 } else { 1782 if (newsp != NULL) { 1783 KEY_FREESP(&newsp); 1784 ipseclog((LOG_DEBUG, "key_spdadd: a SP entry exists already.\n")); 1785 return key_senderror(so, m, EEXIST); 1786 } 1787 } 1788 1789 /* allocation new SP entry */ 1790 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1791 return key_senderror(so, m, error); 1792 } 1793 1794 if ((newsp->id = key_getnewspid()) == 0) { 1795 KFREE(newsp); 1796 return key_senderror(so, m, ENOBUFS); 1797 } 1798 1799 /* XXX boundary check against sa_len */ 1800 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1801 src0 + 1, 1802 dst0 + 1, 1803 src0->sadb_address_prefixlen, 1804 dst0->sadb_address_prefixlen, 1805 src0->sadb_address_proto, 1806 &newsp->spidx); 1807 1808 /* sanity check on addr pair */ 1809 if (((struct sockaddr *)(src0 + 1))->sa_family != 1810 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1811 KFREE(newsp); 1812 return key_senderror(so, m, EINVAL); 1813 } 1814 if (((struct sockaddr *)(src0 + 1))->sa_len != 1815 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1816 KFREE(newsp); 1817 return key_senderror(so, m, EINVAL); 1818 } 1819 #if 1 1820 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1821 struct sockaddr *sa; 1822 sa = (struct sockaddr *)(src0 + 1); 1823 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1824 KFREE(newsp); 1825 return key_senderror(so, m, EINVAL); 1826 } 1827 } 1828 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1829 struct sockaddr *sa; 1830 sa = (struct sockaddr *)(dst0 + 1); 1831 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1832 KFREE(newsp); 1833 return key_senderror(so, m, EINVAL); 1834 } 1835 } 1836 #endif 1837 1838 newsp->created = time_second; 1839 newsp->lastused = newsp->created; 1840 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1841 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1842 1843 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1844 newsp->state = IPSEC_SPSTATE_ALIVE; 1845 LIST_INSERT_TAIL(&sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1846 1847 /* delete the entry in spacqtree */ 1848 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1849 struct secspacq *spacq; 1850 if ((spacq = key_getspacq(&spidx)) != NULL) { 1851 /* reset counter in order to deletion by timehandler. */ 1852 spacq->created = time_second; 1853 spacq->count = 0; 1854 } 1855 } 1856 1857 { 1858 struct mbuf *n, *mpolicy; 1859 struct sadb_msg *newmsg; 1860 int off; 1861 1862 /* create new sadb_msg to reply. */ 1863 if (lft) { 1864 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1865 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1866 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1867 } else { 1868 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1869 SADB_X_EXT_POLICY, 1870 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1871 } 1872 if (!n) 1873 return key_senderror(so, m, ENOBUFS); 1874 1875 if (n->m_len < sizeof(*newmsg)) { 1876 n = m_pullup(n, sizeof(*newmsg)); 1877 if (!n) 1878 return key_senderror(so, m, ENOBUFS); 1879 } 1880 newmsg = mtod(n, struct sadb_msg *); 1881 newmsg->sadb_msg_errno = 0; 1882 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1883 1884 off = 0; 1885 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1886 sizeof(*xpl), &off); 1887 if (mpolicy == NULL) { 1888 /* n is already freed */ 1889 return key_senderror(so, m, ENOBUFS); 1890 } 1891 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1892 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1893 m_freem(n); 1894 return key_senderror(so, m, EINVAL); 1895 } 1896 xpl->sadb_x_policy_id = newsp->id; 1897 1898 m_freem(m); 1899 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1900 } 1901 } 1902 1903 /* 1904 * get new policy id. 1905 * OUT: 1906 * 0: failure. 1907 * others: success. 1908 */ 1909 static u_int32_t 1910 key_getnewspid() 1911 { 1912 u_int32_t newid = 0; 1913 int count = key_spi_trycnt; /* XXX */ 1914 struct secpolicy *sp; 1915 1916 /* when requesting to allocate spi ranged */ 1917 while (count--) { 1918 newid = (policy_id = (policy_id == ~0 ? 1 : policy_id + 1)); 1919 1920 if ((sp = key_getspbyid(newid)) == NULL) 1921 break; 1922 1923 KEY_FREESP(&sp); 1924 } 1925 1926 if (count == 0 || newid == 0) { 1927 ipseclog((LOG_DEBUG, "key_getnewspid: to allocate policy id is failed.\n")); 1928 return 0; 1929 } 1930 1931 return newid; 1932 } 1933 1934 /* 1935 * SADB_SPDDELETE processing 1936 * receive 1937 * <base, address(SD), policy(*)> 1938 * from the user(?), and set SADB_SASTATE_DEAD, 1939 * and send, 1940 * <base, address(SD), policy(*)> 1941 * to the ikmpd. 1942 * policy(*) including direction of policy. 1943 * 1944 * m will always be freed. 1945 */ 1946 static int 1947 key_spddelete(so, m, mhp) 1948 struct socket *so; 1949 struct mbuf *m; 1950 const struct sadb_msghdr *mhp; 1951 { 1952 struct sadb_address *src0, *dst0; 1953 struct sadb_x_policy *xpl0; 1954 struct secpolicyindex spidx; 1955 struct secpolicy *sp; 1956 1957 /* sanity check */ 1958 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 1959 panic("key_spddelete: NULL pointer is passed.\n"); 1960 1961 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1962 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1963 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1964 ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n")); 1965 return key_senderror(so, m, EINVAL); 1966 } 1967 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1968 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1969 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1970 ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n")); 1971 return key_senderror(so, m, EINVAL); 1972 } 1973 1974 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1975 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1976 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1977 1978 /* make secindex */ 1979 /* XXX boundary check against sa_len */ 1980 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1981 src0 + 1, 1982 dst0 + 1, 1983 src0->sadb_address_prefixlen, 1984 dst0->sadb_address_prefixlen, 1985 src0->sadb_address_proto, 1986 &spidx); 1987 1988 /* checking the direciton. */ 1989 switch (xpl0->sadb_x_policy_dir) { 1990 case IPSEC_DIR_INBOUND: 1991 case IPSEC_DIR_OUTBOUND: 1992 break; 1993 default: 1994 ipseclog((LOG_DEBUG, "key_spddelete: Invalid SP direction.\n")); 1995 return key_senderror(so, m, EINVAL); 1996 } 1997 1998 /* Is there SP in SPD ? */ 1999 if ((sp = key_getsp(&spidx)) == NULL) { 2000 ipseclog((LOG_DEBUG, "key_spddelete: no SP found.\n")); 2001 return key_senderror(so, m, EINVAL); 2002 } 2003 2004 /* save policy id to buffer to be returned. */ 2005 xpl0->sadb_x_policy_id = sp->id; 2006 2007 sp->state = IPSEC_SPSTATE_DEAD; 2008 KEY_FREESP(&sp); 2009 2010 { 2011 struct mbuf *n; 2012 struct sadb_msg *newmsg; 2013 2014 /* create new sadb_msg to reply. */ 2015 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2016 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2017 if (!n) 2018 return key_senderror(so, m, ENOBUFS); 2019 2020 newmsg = mtod(n, struct sadb_msg *); 2021 newmsg->sadb_msg_errno = 0; 2022 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2023 2024 m_freem(m); 2025 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2026 } 2027 } 2028 2029 /* 2030 * SADB_SPDDELETE2 processing 2031 * receive 2032 * <base, policy(*)> 2033 * from the user(?), and set SADB_SASTATE_DEAD, 2034 * and send, 2035 * <base, policy(*)> 2036 * to the ikmpd. 2037 * policy(*) including direction of policy. 2038 * 2039 * m will always be freed. 2040 */ 2041 static int 2042 key_spddelete2(so, m, mhp) 2043 struct socket *so; 2044 struct mbuf *m; 2045 const struct sadb_msghdr *mhp; 2046 { 2047 u_int32_t id; 2048 struct secpolicy *sp; 2049 2050 /* sanity check */ 2051 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 2052 panic("key_spddelete2: NULL pointer is passed.\n"); 2053 2054 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2055 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2056 ipseclog((LOG_DEBUG, "key_spddelete2: invalid message is passed.\n")); 2057 key_senderror(so, m, EINVAL); 2058 return 0; 2059 } 2060 2061 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2062 2063 /* Is there SP in SPD ? */ 2064 if ((sp = key_getspbyid(id)) == NULL) { 2065 ipseclog((LOG_DEBUG, "key_spddelete2: no SP found id:%u.\n", id)); 2066 key_senderror(so, m, EINVAL); 2067 } 2068 2069 sp->state = IPSEC_SPSTATE_DEAD; 2070 KEY_FREESP(&sp); 2071 2072 { 2073 struct mbuf *n, *nn; 2074 struct sadb_msg *newmsg; 2075 int off, len; 2076 2077 /* create new sadb_msg to reply. */ 2078 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2079 2080 if (len > MCLBYTES) 2081 return key_senderror(so, m, ENOBUFS); 2082 MGETHDR(n, M_DONTWAIT, MT_DATA); 2083 if (n && len > MHLEN) { 2084 MCLGET(n, M_DONTWAIT); 2085 if ((n->m_flags & M_EXT) == 0) { 2086 m_freem(n); 2087 n = NULL; 2088 } 2089 } 2090 if (!n) 2091 return key_senderror(so, m, ENOBUFS); 2092 2093 n->m_len = len; 2094 n->m_next = NULL; 2095 off = 0; 2096 2097 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2098 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2099 2100 #ifdef DIAGNOSTIC 2101 if (off != len) 2102 panic("length inconsistency in key_spddelete2"); 2103 #endif 2104 2105 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2106 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2107 if (!n->m_next) { 2108 m_freem(n); 2109 return key_senderror(so, m, ENOBUFS); 2110 } 2111 2112 n->m_pkthdr.len = 0; 2113 for (nn = n; nn; nn = nn->m_next) 2114 n->m_pkthdr.len += nn->m_len; 2115 2116 newmsg = mtod(n, struct sadb_msg *); 2117 newmsg->sadb_msg_errno = 0; 2118 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2119 2120 m_freem(m); 2121 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2122 } 2123 } 2124 2125 /* 2126 * SADB_X_GET processing 2127 * receive 2128 * <base, policy(*)> 2129 * from the user(?), 2130 * and send, 2131 * <base, address(SD), policy> 2132 * to the ikmpd. 2133 * policy(*) including direction of policy. 2134 * 2135 * m will always be freed. 2136 */ 2137 static int 2138 key_spdget(so, m, mhp) 2139 struct socket *so; 2140 struct mbuf *m; 2141 const struct sadb_msghdr *mhp; 2142 { 2143 u_int32_t id; 2144 struct secpolicy *sp; 2145 struct mbuf *n; 2146 2147 /* sanity check */ 2148 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 2149 panic("key_spdget: NULL pointer is passed.\n"); 2150 2151 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2152 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2153 ipseclog((LOG_DEBUG, "key_spdget: invalid message is passed.\n")); 2154 return key_senderror(so, m, EINVAL); 2155 } 2156 2157 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2158 2159 /* Is there SP in SPD ? */ 2160 if ((sp = key_getspbyid(id)) == NULL) { 2161 ipseclog((LOG_DEBUG, "key_spdget: no SP found id:%u.\n", id)); 2162 return key_senderror(so, m, ENOENT); 2163 } 2164 2165 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2166 if (n != NULL) { 2167 m_freem(m); 2168 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2169 } else 2170 return key_senderror(so, m, ENOBUFS); 2171 } 2172 2173 /* 2174 * SADB_X_SPDACQUIRE processing. 2175 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2176 * send 2177 * <base, policy(*)> 2178 * to KMD, and expect to receive 2179 * <base> with SADB_X_SPDACQUIRE if error occured, 2180 * or 2181 * <base, policy> 2182 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2183 * policy(*) is without policy requests. 2184 * 2185 * 0 : succeed 2186 * others: error number 2187 */ 2188 int 2189 key_spdacquire(sp) 2190 struct secpolicy *sp; 2191 { 2192 struct mbuf *result = NULL, *m; 2193 struct secspacq *newspacq; 2194 int error; 2195 2196 /* sanity check */ 2197 if (sp == NULL) 2198 panic("key_spdacquire: NULL pointer is passed.\n"); 2199 if (sp->req != NULL) 2200 panic("key_spdacquire: called but there is request.\n"); 2201 if (sp->policy != IPSEC_POLICY_IPSEC) 2202 panic("key_spdacquire: policy mismathed. IPsec is expected.\n"); 2203 2204 /* Get an entry to check whether sent message or not. */ 2205 if ((newspacq = key_getspacq(&sp->spidx)) != NULL) { 2206 if (key_blockacq_count < newspacq->count) { 2207 /* reset counter and do send message. */ 2208 newspacq->count = 0; 2209 } else { 2210 /* increment counter and do nothing. */ 2211 newspacq->count++; 2212 return 0; 2213 } 2214 } else { 2215 /* make new entry for blocking to send SADB_ACQUIRE. */ 2216 if ((newspacq = key_newspacq(&sp->spidx)) == NULL) 2217 return ENOBUFS; 2218 2219 /* add to acqtree */ 2220 LIST_INSERT_HEAD(&spacqtree, newspacq, chain); 2221 } 2222 2223 /* create new sadb_msg to reply. */ 2224 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2225 if (!m) { 2226 error = ENOBUFS; 2227 goto fail; 2228 } 2229 result = m; 2230 2231 result->m_pkthdr.len = 0; 2232 for (m = result; m; m = m->m_next) 2233 result->m_pkthdr.len += m->m_len; 2234 2235 mtod(result, struct sadb_msg *)->sadb_msg_len = 2236 PFKEY_UNIT64(result->m_pkthdr.len); 2237 2238 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2239 2240 fail: 2241 if (result) 2242 m_freem(result); 2243 return error; 2244 } 2245 2246 /* 2247 * SADB_SPDFLUSH processing 2248 * receive 2249 * <base> 2250 * from the user, and free all entries in secpctree. 2251 * and send, 2252 * <base> 2253 * to the user. 2254 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2255 * 2256 * m will always be freed. 2257 */ 2258 static int 2259 key_spdflush(so, m, mhp) 2260 struct socket *so; 2261 struct mbuf *m; 2262 const struct sadb_msghdr *mhp; 2263 { 2264 struct sadb_msg *newmsg; 2265 struct secpolicy *sp; 2266 u_int dir; 2267 2268 /* sanity check */ 2269 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 2270 panic("key_spdflush: NULL pointer is passed.\n"); 2271 2272 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2273 return key_senderror(so, m, EINVAL); 2274 2275 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2276 LIST_FOREACH(sp, &sptree[dir], chain) { 2277 sp->state = IPSEC_SPSTATE_DEAD; 2278 } 2279 } 2280 2281 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2282 ipseclog((LOG_DEBUG, "key_spdflush: No more memory.\n")); 2283 return key_senderror(so, m, ENOBUFS); 2284 } 2285 2286 if (m->m_next) 2287 m_freem(m->m_next); 2288 m->m_next = NULL; 2289 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2290 newmsg = mtod(m, struct sadb_msg *); 2291 newmsg->sadb_msg_errno = 0; 2292 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2293 2294 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2295 } 2296 2297 /* 2298 * SADB_SPDDUMP processing 2299 * receive 2300 * <base> 2301 * from the user, and dump all SP leaves 2302 * and send, 2303 * <base> ..... 2304 * to the ikmpd. 2305 * 2306 * m will always be freed. 2307 */ 2308 static int 2309 key_spddump(so, m, mhp) 2310 struct socket *so; 2311 struct mbuf *m; 2312 const struct sadb_msghdr *mhp; 2313 { 2314 struct secpolicy *sp; 2315 int cnt; 2316 u_int dir; 2317 struct mbuf *n; 2318 2319 /* sanity check */ 2320 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 2321 panic("key_spddump: NULL pointer is passed.\n"); 2322 2323 /* search SPD entry and get buffer size. */ 2324 cnt = 0; 2325 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2326 LIST_FOREACH(sp, &sptree[dir], chain) { 2327 cnt++; 2328 } 2329 } 2330 2331 if (cnt == 0) 2332 return key_senderror(so, m, ENOENT); 2333 2334 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2335 LIST_FOREACH(sp, &sptree[dir], chain) { 2336 --cnt; 2337 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2338 mhp->msg->sadb_msg_pid); 2339 2340 if (n) 2341 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2342 } 2343 } 2344 2345 m_freem(m); 2346 return 0; 2347 } 2348 2349 static struct mbuf * 2350 key_setdumpsp(sp, type, seq, pid) 2351 struct secpolicy *sp; 2352 u_int8_t type; 2353 u_int32_t seq, pid; 2354 { 2355 struct mbuf *result = NULL, *m; 2356 2357 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2358 if (!m) 2359 goto fail; 2360 result = m; 2361 2362 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2363 &sp->spidx.src.sa, sp->spidx.prefs, 2364 sp->spidx.ul_proto); 2365 if (!m) 2366 goto fail; 2367 m_cat(result, m); 2368 2369 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2370 &sp->spidx.dst.sa, sp->spidx.prefd, 2371 sp->spidx.ul_proto); 2372 if (!m) 2373 goto fail; 2374 m_cat(result, m); 2375 2376 m = key_sp2msg(sp); 2377 if (!m) 2378 goto fail; 2379 m_cat(result, m); 2380 2381 if ((result->m_flags & M_PKTHDR) == 0) 2382 goto fail; 2383 2384 if (result->m_len < sizeof(struct sadb_msg)) { 2385 result = m_pullup(result, sizeof(struct sadb_msg)); 2386 if (result == NULL) 2387 goto fail; 2388 } 2389 2390 result->m_pkthdr.len = 0; 2391 for (m = result; m; m = m->m_next) 2392 result->m_pkthdr.len += m->m_len; 2393 2394 mtod(result, struct sadb_msg *)->sadb_msg_len = 2395 PFKEY_UNIT64(result->m_pkthdr.len); 2396 2397 return result; 2398 2399 fail: 2400 m_freem(result); 2401 return NULL; 2402 } 2403 2404 /* 2405 * get PFKEY message length for security policy and request. 2406 */ 2407 static u_int 2408 key_getspreqmsglen(sp) 2409 struct secpolicy *sp; 2410 { 2411 u_int tlen; 2412 2413 tlen = sizeof(struct sadb_x_policy); 2414 2415 /* if is the policy for ipsec ? */ 2416 if (sp->policy != IPSEC_POLICY_IPSEC) 2417 return tlen; 2418 2419 /* get length of ipsec requests */ 2420 { 2421 struct ipsecrequest *isr; 2422 int len; 2423 2424 for (isr = sp->req; isr != NULL; isr = isr->next) { 2425 len = sizeof(struct sadb_x_ipsecrequest) 2426 + isr->saidx.src.sa.sa_len 2427 + isr->saidx.dst.sa.sa_len; 2428 2429 tlen += PFKEY_ALIGN8(len); 2430 } 2431 } 2432 2433 return tlen; 2434 } 2435 2436 /* 2437 * SADB_SPDEXPIRE processing 2438 * send 2439 * <base, address(SD), lifetime(CH), policy> 2440 * to KMD by PF_KEY. 2441 * 2442 * OUT: 0 : succeed 2443 * others : error number 2444 */ 2445 static int 2446 key_spdexpire(sp) 2447 struct secpolicy *sp; 2448 { 2449 int s; 2450 struct mbuf *result = NULL, *m; 2451 int len; 2452 int error = -1; 2453 struct sadb_lifetime *lt; 2454 2455 /* XXX: Why do we lock ? */ 2456 s = splnet(); /*called from softclock()*/ 2457 2458 /* sanity check */ 2459 if (sp == NULL) 2460 panic("key_spdexpire: NULL pointer is passed.\n"); 2461 2462 /* set msg header */ 2463 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2464 if (!m) { 2465 error = ENOBUFS; 2466 goto fail; 2467 } 2468 result = m; 2469 2470 /* create lifetime extension (current and hard) */ 2471 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2472 m = key_alloc_mbuf(len); 2473 if (!m || m->m_next) { /*XXX*/ 2474 if (m) 2475 m_freem(m); 2476 error = ENOBUFS; 2477 goto fail; 2478 } 2479 bzero(mtod(m, caddr_t), len); 2480 lt = mtod(m, struct sadb_lifetime *); 2481 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2482 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2483 lt->sadb_lifetime_allocations = 0; 2484 lt->sadb_lifetime_bytes = 0; 2485 lt->sadb_lifetime_addtime = sp->created; 2486 lt->sadb_lifetime_usetime = sp->lastused; 2487 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2488 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2489 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2490 lt->sadb_lifetime_allocations = 0; 2491 lt->sadb_lifetime_bytes = 0; 2492 lt->sadb_lifetime_addtime = sp->lifetime; 2493 lt->sadb_lifetime_usetime = sp->validtime; 2494 m_cat(result, m); 2495 2496 /* set sadb_address for source */ 2497 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2498 &sp->spidx.src.sa, 2499 sp->spidx.prefs, sp->spidx.ul_proto); 2500 if (!m) { 2501 error = ENOBUFS; 2502 goto fail; 2503 } 2504 m_cat(result, m); 2505 2506 /* set sadb_address for destination */ 2507 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2508 &sp->spidx.dst.sa, 2509 sp->spidx.prefd, sp->spidx.ul_proto); 2510 if (!m) { 2511 error = ENOBUFS; 2512 goto fail; 2513 } 2514 m_cat(result, m); 2515 2516 /* set secpolicy */ 2517 m = key_sp2msg(sp); 2518 if (!m) { 2519 error = ENOBUFS; 2520 goto fail; 2521 } 2522 m_cat(result, m); 2523 2524 if ((result->m_flags & M_PKTHDR) == 0) { 2525 error = EINVAL; 2526 goto fail; 2527 } 2528 2529 if (result->m_len < sizeof(struct sadb_msg)) { 2530 result = m_pullup(result, sizeof(struct sadb_msg)); 2531 if (result == NULL) { 2532 error = ENOBUFS; 2533 goto fail; 2534 } 2535 } 2536 2537 result->m_pkthdr.len = 0; 2538 for (m = result; m; m = m->m_next) 2539 result->m_pkthdr.len += m->m_len; 2540 2541 mtod(result, struct sadb_msg *)->sadb_msg_len = 2542 PFKEY_UNIT64(result->m_pkthdr.len); 2543 2544 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2545 2546 fail: 2547 if (result) 2548 m_freem(result); 2549 splx(s); 2550 return error; 2551 } 2552 2553 /* %%% SAD management */ 2554 /* 2555 * allocating a memory for new SA head, and copy from the values of mhp. 2556 * OUT: NULL : failure due to the lack of memory. 2557 * others : pointer to new SA head. 2558 */ 2559 static struct secashead * 2560 key_newsah(saidx) 2561 struct secasindex *saidx; 2562 { 2563 struct secashead *newsah; 2564 2565 KASSERT(saidx != NULL, ("key_newsaidx: null saidx")); 2566 2567 newsah = (struct secashead *) 2568 malloc(sizeof(struct secashead), M_SECA, M_NOWAIT|M_ZERO); 2569 if (newsah != NULL) { 2570 int i; 2571 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2572 LIST_INIT(&newsah->savtree[i]); 2573 newsah->saidx = *saidx; 2574 2575 /* add to saidxtree */ 2576 newsah->state = SADB_SASTATE_MATURE; 2577 LIST_INSERT_HEAD(&sahtree, newsah, chain); 2578 } 2579 return(newsah); 2580 } 2581 2582 /* 2583 * delete SA index and all SA registerd. 2584 */ 2585 static void 2586 key_delsah(sah) 2587 struct secashead *sah; 2588 { 2589 struct secasvar *sav, *nextsav; 2590 u_int stateidx, state; 2591 int s; 2592 int zombie = 0; 2593 2594 /* sanity check */ 2595 if (sah == NULL) 2596 panic("key_delsah: NULL pointer is passed.\n"); 2597 2598 s = splnet(); /*called from softclock()*/ 2599 2600 /* searching all SA registerd in the secindex. */ 2601 for (stateidx = 0; 2602 stateidx < _ARRAYLEN(saorder_state_any); 2603 stateidx++) { 2604 2605 state = saorder_state_any[stateidx]; 2606 for (sav = (struct secasvar *)LIST_FIRST(&sah->savtree[state]); 2607 sav != NULL; 2608 sav = nextsav) { 2609 2610 nextsav = LIST_NEXT(sav, chain); 2611 2612 if (sav->refcnt == 0) { 2613 /* sanity check */ 2614 KEY_CHKSASTATE(state, sav->state, "key_delsah"); 2615 KEY_FREESAV(&sav); 2616 } else { 2617 /* give up to delete this sa */ 2618 zombie++; 2619 } 2620 } 2621 } 2622 2623 /* don't delete sah only if there are savs. */ 2624 if (zombie) { 2625 splx(s); 2626 return; 2627 } 2628 2629 if (sah->sa_route.ro_rt) { 2630 RTFREE(sah->sa_route.ro_rt); 2631 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2632 } 2633 2634 /* remove from tree of SA index */ 2635 if (__LIST_CHAINED(sah)) 2636 LIST_REMOVE(sah, chain); 2637 2638 KFREE(sah); 2639 2640 splx(s); 2641 return; 2642 } 2643 2644 /* 2645 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2646 * and copy the values of mhp into new buffer. 2647 * When SAD message type is GETSPI: 2648 * to set sequence number from acq_seq++, 2649 * to set zero to SPI. 2650 * not to call key_setsava(). 2651 * OUT: NULL : fail 2652 * others : pointer to new secasvar. 2653 * 2654 * does not modify mbuf. does not free mbuf on error. 2655 */ 2656 static struct secasvar * 2657 key_newsav(m, mhp, sah, errp, where, tag) 2658 struct mbuf *m; 2659 const struct sadb_msghdr *mhp; 2660 struct secashead *sah; 2661 int *errp; 2662 const char* where; 2663 int tag; 2664 { 2665 struct secasvar *newsav; 2666 const struct sadb_sa *xsa; 2667 2668 /* sanity check */ 2669 if (m == NULL || mhp == NULL || mhp->msg == NULL || sah == NULL) 2670 panic("key_newsa: NULL pointer is passed.\n"); 2671 2672 KMALLOC(newsav, struct secasvar *, sizeof(struct secasvar)); 2673 if (newsav == NULL) { 2674 ipseclog((LOG_DEBUG, "key_newsa: No more memory.\n")); 2675 *errp = ENOBUFS; 2676 goto done; 2677 } 2678 bzero((caddr_t)newsav, sizeof(struct secasvar)); 2679 2680 switch (mhp->msg->sadb_msg_type) { 2681 case SADB_GETSPI: 2682 newsav->spi = 0; 2683 2684 #ifdef IPSEC_DOSEQCHECK 2685 /* sync sequence number */ 2686 if (mhp->msg->sadb_msg_seq == 0) 2687 newsav->seq = 2688 (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq)); 2689 else 2690 #endif 2691 newsav->seq = mhp->msg->sadb_msg_seq; 2692 break; 2693 2694 case SADB_ADD: 2695 /* sanity check */ 2696 if (mhp->ext[SADB_EXT_SA] == NULL) { 2697 KFREE(newsav), newsav = NULL; 2698 ipseclog((LOG_DEBUG, "key_newsa: invalid message is passed.\n")); 2699 *errp = EINVAL; 2700 goto done; 2701 } 2702 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2703 newsav->spi = xsa->sadb_sa_spi; 2704 newsav->seq = mhp->msg->sadb_msg_seq; 2705 break; 2706 default: 2707 KFREE(newsav), newsav = NULL; 2708 *errp = EINVAL; 2709 goto done; 2710 } 2711 2712 /* copy sav values */ 2713 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2714 *errp = key_setsaval(newsav, m, mhp); 2715 if (*errp) { 2716 KFREE(newsav), newsav = NULL; 2717 goto done; 2718 } 2719 } 2720 2721 /* reset created */ 2722 newsav->created = time_second; 2723 newsav->pid = mhp->msg->sadb_msg_pid; 2724 2725 /* add to satree */ 2726 newsav->sah = sah; 2727 newsav->refcnt = 1; 2728 newsav->state = SADB_SASTATE_LARVAL; 2729 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2730 secasvar, chain); 2731 done: 2732 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2733 printf("DP key_newsav from %s:%u return SP:%p\n", 2734 where, tag, newsav)); 2735 2736 return newsav; 2737 } 2738 2739 /* 2740 * free() SA variable entry. 2741 */ 2742 static void 2743 key_delsav(sav) 2744 struct secasvar *sav; 2745 { 2746 KASSERT(sav != NULL, ("key_delsav: null sav")); 2747 KASSERT(sav->refcnt == 0, 2748 ("key_delsav: reference count %u > 0", sav->refcnt)); 2749 2750 /* remove from SA header */ 2751 if (__LIST_CHAINED(sav)) 2752 LIST_REMOVE(sav, chain); 2753 2754 if (sav->key_auth != NULL) { 2755 bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth)); 2756 KFREE(sav->key_auth); 2757 sav->key_auth = NULL; 2758 } 2759 if (sav->key_enc != NULL) { 2760 bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc)); 2761 KFREE(sav->key_enc); 2762 sav->key_enc = NULL; 2763 } 2764 if (sav->sched) { 2765 bzero(sav->sched, sav->schedlen); 2766 KFREE(sav->sched); 2767 sav->sched = NULL; 2768 } 2769 if (sav->replay != NULL) { 2770 KFREE(sav->replay); 2771 sav->replay = NULL; 2772 } 2773 if (sav->lft_c != NULL) { 2774 KFREE(sav->lft_c); 2775 sav->lft_c = NULL; 2776 } 2777 if (sav->lft_h != NULL) { 2778 KFREE(sav->lft_h); 2779 sav->lft_h = NULL; 2780 } 2781 if (sav->lft_s != NULL) { 2782 KFREE(sav->lft_s); 2783 sav->lft_s = NULL; 2784 } 2785 if (sav->iv != NULL) { 2786 KFREE(sav->iv); 2787 sav->iv = NULL; 2788 } 2789 2790 KFREE(sav); 2791 2792 return; 2793 } 2794 2795 /* 2796 * search SAD. 2797 * OUT: 2798 * NULL : not found 2799 * others : found, pointer to a SA. 2800 */ 2801 static struct secashead * 2802 key_getsah(saidx) 2803 struct secasindex *saidx; 2804 { 2805 struct secashead *sah; 2806 2807 LIST_FOREACH(sah, &sahtree, chain) { 2808 if (sah->state == SADB_SASTATE_DEAD) 2809 continue; 2810 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2811 return sah; 2812 } 2813 2814 return NULL; 2815 } 2816 2817 /* 2818 * check not to be duplicated SPI. 2819 * NOTE: this function is too slow due to searching all SAD. 2820 * OUT: 2821 * NULL : not found 2822 * others : found, pointer to a SA. 2823 */ 2824 static struct secasvar * 2825 key_checkspidup(saidx, spi) 2826 struct secasindex *saidx; 2827 u_int32_t spi; 2828 { 2829 struct secashead *sah; 2830 struct secasvar *sav; 2831 2832 /* check address family */ 2833 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2834 ipseclog((LOG_DEBUG, "key_checkspidup: address family mismatched.\n")); 2835 return NULL; 2836 } 2837 2838 /* check all SAD */ 2839 LIST_FOREACH(sah, &sahtree, chain) { 2840 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2841 continue; 2842 sav = key_getsavbyspi(sah, spi); 2843 if (sav != NULL) 2844 return sav; 2845 } 2846 2847 return NULL; 2848 } 2849 2850 /* 2851 * search SAD litmited alive SA, protocol, SPI. 2852 * OUT: 2853 * NULL : not found 2854 * others : found, pointer to a SA. 2855 */ 2856 static struct secasvar * 2857 key_getsavbyspi(sah, spi) 2858 struct secashead *sah; 2859 u_int32_t spi; 2860 { 2861 struct secasvar *sav; 2862 u_int stateidx, state; 2863 2864 /* search all status */ 2865 for (stateidx = 0; 2866 stateidx < _ARRAYLEN(saorder_state_alive); 2867 stateidx++) { 2868 2869 state = saorder_state_alive[stateidx]; 2870 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2871 2872 /* sanity check */ 2873 if (sav->state != state) { 2874 ipseclog((LOG_DEBUG, "key_getsavbyspi: " 2875 "invalid sav->state (queue: %d SA: %d)\n", 2876 state, sav->state)); 2877 continue; 2878 } 2879 2880 if (sav->spi == spi) 2881 return sav; 2882 } 2883 } 2884 2885 return NULL; 2886 } 2887 2888 /* 2889 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 2890 * You must update these if need. 2891 * OUT: 0: success. 2892 * !0: failure. 2893 * 2894 * does not modify mbuf. does not free mbuf on error. 2895 */ 2896 static int 2897 key_setsaval(sav, m, mhp) 2898 struct secasvar *sav; 2899 struct mbuf *m; 2900 const struct sadb_msghdr *mhp; 2901 { 2902 int error = 0; 2903 2904 /* sanity check */ 2905 if (m == NULL || mhp == NULL || mhp->msg == NULL) 2906 panic("key_setsaval: NULL pointer is passed.\n"); 2907 2908 /* initialization */ 2909 sav->replay = NULL; 2910 sav->key_auth = NULL; 2911 sav->key_enc = NULL; 2912 sav->sched = NULL; 2913 sav->schedlen = 0; 2914 sav->iv = NULL; 2915 sav->lft_c = NULL; 2916 sav->lft_h = NULL; 2917 sav->lft_s = NULL; 2918 sav->tdb_xform = NULL; /* transform */ 2919 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 2920 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 2921 sav->tdb_compalgxform = NULL; /* compression algorithm */ 2922 2923 /* SA */ 2924 if (mhp->ext[SADB_EXT_SA] != NULL) { 2925 const struct sadb_sa *sa0; 2926 2927 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2928 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 2929 error = EINVAL; 2930 goto fail; 2931 } 2932 2933 sav->alg_auth = sa0->sadb_sa_auth; 2934 sav->alg_enc = sa0->sadb_sa_encrypt; 2935 sav->flags = sa0->sadb_sa_flags; 2936 2937 /* replay window */ 2938 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 2939 sav->replay = (struct secreplay *) 2940 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_SECA, M_NOWAIT|M_ZERO); 2941 if (sav->replay == NULL) { 2942 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); 2943 error = ENOBUFS; 2944 goto fail; 2945 } 2946 if (sa0->sadb_sa_replay != 0) 2947 sav->replay->bitmap = (caddr_t)(sav->replay+1); 2948 sav->replay->wsize = sa0->sadb_sa_replay; 2949 } 2950 } 2951 2952 /* Authentication keys */ 2953 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 2954 const struct sadb_key *key0; 2955 int len; 2956 2957 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 2958 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 2959 2960 error = 0; 2961 if (len < sizeof(*key0)) { 2962 error = EINVAL; 2963 goto fail; 2964 } 2965 switch (mhp->msg->sadb_msg_satype) { 2966 case SADB_SATYPE_AH: 2967 case SADB_SATYPE_ESP: 2968 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 2969 sav->alg_auth != SADB_X_AALG_NULL) 2970 error = EINVAL; 2971 break; 2972 case SADB_X_SATYPE_IPCOMP: 2973 default: 2974 error = EINVAL; 2975 break; 2976 } 2977 if (error) { 2978 ipseclog((LOG_DEBUG, "key_setsaval: invalid key_auth values.\n")); 2979 goto fail; 2980 } 2981 2982 sav->key_auth = (struct sadb_key *)key_newbuf(key0, len); 2983 if (sav->key_auth == NULL) { 2984 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); 2985 error = ENOBUFS; 2986 goto fail; 2987 } 2988 } 2989 2990 /* Encryption key */ 2991 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 2992 const struct sadb_key *key0; 2993 int len; 2994 2995 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 2996 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 2997 2998 error = 0; 2999 if (len < sizeof(*key0)) { 3000 error = EINVAL; 3001 goto fail; 3002 } 3003 switch (mhp->msg->sadb_msg_satype) { 3004 case SADB_SATYPE_ESP: 3005 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3006 sav->alg_enc != SADB_EALG_NULL) { 3007 error = EINVAL; 3008 break; 3009 } 3010 sav->key_enc = (struct sadb_key *)key_newbuf(key0, len); 3011 if (sav->key_enc == NULL) { 3012 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); 3013 error = ENOBUFS; 3014 goto fail; 3015 } 3016 break; 3017 case SADB_X_SATYPE_IPCOMP: 3018 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3019 error = EINVAL; 3020 sav->key_enc = NULL; /*just in case*/ 3021 break; 3022 case SADB_SATYPE_AH: 3023 default: 3024 error = EINVAL; 3025 break; 3026 } 3027 if (error) { 3028 ipseclog((LOG_DEBUG, "key_setsatval: invalid key_enc value.\n")); 3029 goto fail; 3030 } 3031 } 3032 3033 /* set iv */ 3034 sav->ivlen = 0; 3035 3036 switch (mhp->msg->sadb_msg_satype) { 3037 case SADB_SATYPE_AH: 3038 error = xform_init(sav, XF_AH); 3039 break; 3040 case SADB_SATYPE_ESP: 3041 error = xform_init(sav, XF_ESP); 3042 break; 3043 case SADB_X_SATYPE_IPCOMP: 3044 error = xform_init(sav, XF_IPCOMP); 3045 break; 3046 } 3047 if (error) { 3048 ipseclog((LOG_DEBUG, 3049 "key_setsaval: unable to initialize SA type %u.\n", 3050 mhp->msg->sadb_msg_satype)); 3051 goto fail; 3052 } 3053 3054 /* reset created */ 3055 sav->created = time_second; 3056 3057 /* make lifetime for CURRENT */ 3058 KMALLOC(sav->lft_c, struct sadb_lifetime *, 3059 sizeof(struct sadb_lifetime)); 3060 if (sav->lft_c == NULL) { 3061 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); 3062 error = ENOBUFS; 3063 goto fail; 3064 } 3065 3066 sav->lft_c->sadb_lifetime_len = 3067 PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 3068 sav->lft_c->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 3069 sav->lft_c->sadb_lifetime_allocations = 0; 3070 sav->lft_c->sadb_lifetime_bytes = 0; 3071 sav->lft_c->sadb_lifetime_addtime = time_second; 3072 sav->lft_c->sadb_lifetime_usetime = 0; 3073 3074 /* lifetimes for HARD and SOFT */ 3075 { 3076 const struct sadb_lifetime *lft0; 3077 3078 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3079 if (lft0 != NULL) { 3080 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3081 error = EINVAL; 3082 goto fail; 3083 } 3084 sav->lft_h = (struct sadb_lifetime *)key_newbuf(lft0, 3085 sizeof(*lft0)); 3086 if (sav->lft_h == NULL) { 3087 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); 3088 error = ENOBUFS; 3089 goto fail; 3090 } 3091 /* to be initialize ? */ 3092 } 3093 3094 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3095 if (lft0 != NULL) { 3096 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3097 error = EINVAL; 3098 goto fail; 3099 } 3100 sav->lft_s = (struct sadb_lifetime *)key_newbuf(lft0, 3101 sizeof(*lft0)); 3102 if (sav->lft_s == NULL) { 3103 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); 3104 error = ENOBUFS; 3105 goto fail; 3106 } 3107 /* to be initialize ? */ 3108 } 3109 } 3110 3111 return 0; 3112 3113 fail: 3114 /* initialization */ 3115 if (sav->replay != NULL) { 3116 KFREE(sav->replay); 3117 sav->replay = NULL; 3118 } 3119 if (sav->key_auth != NULL) { 3120 KFREE(sav->key_auth); 3121 sav->key_auth = NULL; 3122 } 3123 if (sav->key_enc != NULL) { 3124 KFREE(sav->key_enc); 3125 sav->key_enc = NULL; 3126 } 3127 if (sav->sched) { 3128 KFREE(sav->sched); 3129 sav->sched = NULL; 3130 } 3131 if (sav->iv != NULL) { 3132 KFREE(sav->iv); 3133 sav->iv = NULL; 3134 } 3135 if (sav->lft_c != NULL) { 3136 KFREE(sav->lft_c); 3137 sav->lft_c = NULL; 3138 } 3139 if (sav->lft_h != NULL) { 3140 KFREE(sav->lft_h); 3141 sav->lft_h = NULL; 3142 } 3143 if (sav->lft_s != NULL) { 3144 KFREE(sav->lft_s); 3145 sav->lft_s = NULL; 3146 } 3147 3148 return error; 3149 } 3150 3151 /* 3152 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3153 * OUT: 0: valid 3154 * other: errno 3155 */ 3156 static int 3157 key_mature(sav) 3158 struct secasvar *sav; 3159 { 3160 int error; 3161 3162 /* check SPI value */ 3163 switch (sav->sah->saidx.proto) { 3164 case IPPROTO_ESP: 3165 case IPPROTO_AH: 3166 if (ntohl(sav->spi) >= 0 && ntohl(sav->spi) <= 255) { 3167 ipseclog((LOG_DEBUG, 3168 "key_mature: illegal range of SPI %u.\n", 3169 (u_int32_t)ntohl(sav->spi))); 3170 return EINVAL; 3171 } 3172 break; 3173 } 3174 3175 /* check satype */ 3176 switch (sav->sah->saidx.proto) { 3177 case IPPROTO_ESP: 3178 /* check flags */ 3179 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3180 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3181 ipseclog((LOG_DEBUG, "key_mature: " 3182 "invalid flag (derived) given to old-esp.\n")); 3183 return EINVAL; 3184 } 3185 error = xform_init(sav, XF_ESP); 3186 break; 3187 case IPPROTO_AH: 3188 /* check flags */ 3189 if (sav->flags & SADB_X_EXT_DERIV) { 3190 ipseclog((LOG_DEBUG, "key_mature: " 3191 "invalid flag (derived) given to AH SA.\n")); 3192 return EINVAL; 3193 } 3194 if (sav->alg_enc != SADB_EALG_NONE) { 3195 ipseclog((LOG_DEBUG, "key_mature: " 3196 "protocol and algorithm mismated.\n")); 3197 return(EINVAL); 3198 } 3199 error = xform_init(sav, XF_AH); 3200 break; 3201 case IPPROTO_IPCOMP: 3202 if (sav->alg_auth != SADB_AALG_NONE) { 3203 ipseclog((LOG_DEBUG, "key_mature: " 3204 "protocol and algorithm mismated.\n")); 3205 return(EINVAL); 3206 } 3207 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3208 && ntohl(sav->spi) >= 0x10000) { 3209 ipseclog((LOG_DEBUG, "key_mature: invalid cpi for IPComp.\n")); 3210 return(EINVAL); 3211 } 3212 error = xform_init(sav, XF_IPCOMP); 3213 break; 3214 default: 3215 ipseclog((LOG_DEBUG, "key_mature: Invalid satype.\n")); 3216 error = EPROTONOSUPPORT; 3217 break; 3218 } 3219 if (error == 0) 3220 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3221 return (error); 3222 } 3223 3224 /* 3225 * subroutine for SADB_GET and SADB_DUMP. 3226 */ 3227 static struct mbuf * 3228 key_setdumpsa(sav, type, satype, seq, pid) 3229 struct secasvar *sav; 3230 u_int8_t type, satype; 3231 u_int32_t seq, pid; 3232 { 3233 struct mbuf *result = NULL, *tres = NULL, *m; 3234 int l = 0; 3235 int i; 3236 void *p; 3237 int dumporder[] = { 3238 SADB_EXT_SA, SADB_X_EXT_SA2, 3239 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3240 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3241 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3242 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3243 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3244 }; 3245 3246 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3247 if (m == NULL) 3248 goto fail; 3249 result = m; 3250 3251 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3252 m = NULL; 3253 p = NULL; 3254 switch (dumporder[i]) { 3255 case SADB_EXT_SA: 3256 m = key_setsadbsa(sav); 3257 if (!m) 3258 goto fail; 3259 break; 3260 3261 case SADB_X_EXT_SA2: 3262 m = key_setsadbxsa2(sav->sah->saidx.mode, 3263 sav->replay ? sav->replay->count : 0, 3264 sav->sah->saidx.reqid); 3265 if (!m) 3266 goto fail; 3267 break; 3268 3269 case SADB_EXT_ADDRESS_SRC: 3270 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3271 &sav->sah->saidx.src.sa, 3272 FULLMASK, IPSEC_ULPROTO_ANY); 3273 if (!m) 3274 goto fail; 3275 break; 3276 3277 case SADB_EXT_ADDRESS_DST: 3278 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3279 &sav->sah->saidx.dst.sa, 3280 FULLMASK, IPSEC_ULPROTO_ANY); 3281 if (!m) 3282 goto fail; 3283 break; 3284 3285 case SADB_EXT_KEY_AUTH: 3286 if (!sav->key_auth) 3287 continue; 3288 l = PFKEY_UNUNIT64(sav->key_auth->sadb_key_len); 3289 p = sav->key_auth; 3290 break; 3291 3292 case SADB_EXT_KEY_ENCRYPT: 3293 if (!sav->key_enc) 3294 continue; 3295 l = PFKEY_UNUNIT64(sav->key_enc->sadb_key_len); 3296 p = sav->key_enc; 3297 break; 3298 3299 case SADB_EXT_LIFETIME_CURRENT: 3300 if (!sav->lft_c) 3301 continue; 3302 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_c)->sadb_ext_len); 3303 p = sav->lft_c; 3304 break; 3305 3306 case SADB_EXT_LIFETIME_HARD: 3307 if (!sav->lft_h) 3308 continue; 3309 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_h)->sadb_ext_len); 3310 p = sav->lft_h; 3311 break; 3312 3313 case SADB_EXT_LIFETIME_SOFT: 3314 if (!sav->lft_s) 3315 continue; 3316 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_s)->sadb_ext_len); 3317 p = sav->lft_s; 3318 break; 3319 3320 case SADB_EXT_ADDRESS_PROXY: 3321 case SADB_EXT_IDENTITY_SRC: 3322 case SADB_EXT_IDENTITY_DST: 3323 /* XXX: should we brought from SPD ? */ 3324 case SADB_EXT_SENSITIVITY: 3325 default: 3326 continue; 3327 } 3328 3329 if ((!m && !p) || (m && p)) 3330 goto fail; 3331 if (p && tres) { 3332 M_PREPEND(tres, l, M_DONTWAIT); 3333 if (!tres) 3334 goto fail; 3335 bcopy(p, mtod(tres, caddr_t), l); 3336 continue; 3337 } 3338 if (p) { 3339 m = key_alloc_mbuf(l); 3340 if (!m) 3341 goto fail; 3342 m_copyback(m, 0, l, p); 3343 } 3344 3345 if (tres) 3346 m_cat(m, tres); 3347 tres = m; 3348 } 3349 3350 m_cat(result, tres); 3351 3352 if (result->m_len < sizeof(struct sadb_msg)) { 3353 result = m_pullup(result, sizeof(struct sadb_msg)); 3354 if (result == NULL) 3355 goto fail; 3356 } 3357 3358 result->m_pkthdr.len = 0; 3359 for (m = result; m; m = m->m_next) 3360 result->m_pkthdr.len += m->m_len; 3361 3362 mtod(result, struct sadb_msg *)->sadb_msg_len = 3363 PFKEY_UNIT64(result->m_pkthdr.len); 3364 3365 return result; 3366 3367 fail: 3368 m_freem(result); 3369 m_freem(tres); 3370 return NULL; 3371 } 3372 3373 /* 3374 * set data into sadb_msg. 3375 */ 3376 static struct mbuf * 3377 key_setsadbmsg(type, tlen, satype, seq, pid, reserved) 3378 u_int8_t type, satype; 3379 u_int16_t tlen; 3380 u_int32_t seq; 3381 pid_t pid; 3382 u_int16_t reserved; 3383 { 3384 struct mbuf *m; 3385 struct sadb_msg *p; 3386 int len; 3387 3388 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3389 if (len > MCLBYTES) 3390 return NULL; 3391 MGETHDR(m, M_DONTWAIT, MT_DATA); 3392 if (m && len > MHLEN) { 3393 MCLGET(m, M_DONTWAIT); 3394 if ((m->m_flags & M_EXT) == 0) { 3395 m_freem(m); 3396 m = NULL; 3397 } 3398 } 3399 if (!m) 3400 return NULL; 3401 m->m_pkthdr.len = m->m_len = len; 3402 m->m_next = NULL; 3403 3404 p = mtod(m, struct sadb_msg *); 3405 3406 bzero(p, len); 3407 p->sadb_msg_version = PF_KEY_V2; 3408 p->sadb_msg_type = type; 3409 p->sadb_msg_errno = 0; 3410 p->sadb_msg_satype = satype; 3411 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3412 p->sadb_msg_reserved = reserved; 3413 p->sadb_msg_seq = seq; 3414 p->sadb_msg_pid = (u_int32_t)pid; 3415 3416 return m; 3417 } 3418 3419 /* 3420 * copy secasvar data into sadb_address. 3421 */ 3422 static struct mbuf * 3423 key_setsadbsa(sav) 3424 struct secasvar *sav; 3425 { 3426 struct mbuf *m; 3427 struct sadb_sa *p; 3428 int len; 3429 3430 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3431 m = key_alloc_mbuf(len); 3432 if (!m || m->m_next) { /*XXX*/ 3433 if (m) 3434 m_freem(m); 3435 return NULL; 3436 } 3437 3438 p = mtod(m, struct sadb_sa *); 3439 3440 bzero(p, len); 3441 p->sadb_sa_len = PFKEY_UNIT64(len); 3442 p->sadb_sa_exttype = SADB_EXT_SA; 3443 p->sadb_sa_spi = sav->spi; 3444 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3445 p->sadb_sa_state = sav->state; 3446 p->sadb_sa_auth = sav->alg_auth; 3447 p->sadb_sa_encrypt = sav->alg_enc; 3448 p->sadb_sa_flags = sav->flags; 3449 3450 return m; 3451 } 3452 3453 /* 3454 * set data into sadb_address. 3455 */ 3456 static struct mbuf * 3457 key_setsadbaddr(exttype, saddr, prefixlen, ul_proto) 3458 u_int16_t exttype; 3459 const struct sockaddr *saddr; 3460 u_int8_t prefixlen; 3461 u_int16_t ul_proto; 3462 { 3463 struct mbuf *m; 3464 struct sadb_address *p; 3465 size_t len; 3466 3467 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3468 PFKEY_ALIGN8(saddr->sa_len); 3469 m = key_alloc_mbuf(len); 3470 if (!m || m->m_next) { /*XXX*/ 3471 if (m) 3472 m_freem(m); 3473 return NULL; 3474 } 3475 3476 p = mtod(m, struct sadb_address *); 3477 3478 bzero(p, len); 3479 p->sadb_address_len = PFKEY_UNIT64(len); 3480 p->sadb_address_exttype = exttype; 3481 p->sadb_address_proto = ul_proto; 3482 if (prefixlen == FULLMASK) { 3483 switch (saddr->sa_family) { 3484 case AF_INET: 3485 prefixlen = sizeof(struct in_addr) << 3; 3486 break; 3487 case AF_INET6: 3488 prefixlen = sizeof(struct in6_addr) << 3; 3489 break; 3490 default: 3491 ; /*XXX*/ 3492 } 3493 } 3494 p->sadb_address_prefixlen = prefixlen; 3495 p->sadb_address_reserved = 0; 3496 3497 bcopy(saddr, 3498 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3499 saddr->sa_len); 3500 3501 return m; 3502 } 3503 3504 #if 0 3505 /* 3506 * set data into sadb_ident. 3507 */ 3508 static struct mbuf * 3509 key_setsadbident(exttype, idtype, string, stringlen, id) 3510 u_int16_t exttype, idtype; 3511 caddr_t string; 3512 int stringlen; 3513 u_int64_t id; 3514 { 3515 struct mbuf *m; 3516 struct sadb_ident *p; 3517 size_t len; 3518 3519 len = PFKEY_ALIGN8(sizeof(struct sadb_ident)) + PFKEY_ALIGN8(stringlen); 3520 m = key_alloc_mbuf(len); 3521 if (!m || m->m_next) { /*XXX*/ 3522 if (m) 3523 m_freem(m); 3524 return NULL; 3525 } 3526 3527 p = mtod(m, struct sadb_ident *); 3528 3529 bzero(p, len); 3530 p->sadb_ident_len = PFKEY_UNIT64(len); 3531 p->sadb_ident_exttype = exttype; 3532 p->sadb_ident_type = idtype; 3533 p->sadb_ident_reserved = 0; 3534 p->sadb_ident_id = id; 3535 3536 bcopy(string, 3537 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_ident)), 3538 stringlen); 3539 3540 return m; 3541 } 3542 #endif 3543 3544 /* 3545 * set data into sadb_x_sa2. 3546 */ 3547 static struct mbuf * 3548 key_setsadbxsa2(mode, seq, reqid) 3549 u_int8_t mode; 3550 u_int32_t seq, reqid; 3551 { 3552 struct mbuf *m; 3553 struct sadb_x_sa2 *p; 3554 size_t len; 3555 3556 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3557 m = key_alloc_mbuf(len); 3558 if (!m || m->m_next) { /*XXX*/ 3559 if (m) 3560 m_freem(m); 3561 return NULL; 3562 } 3563 3564 p = mtod(m, struct sadb_x_sa2 *); 3565 3566 bzero(p, len); 3567 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3568 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3569 p->sadb_x_sa2_mode = mode; 3570 p->sadb_x_sa2_reserved1 = 0; 3571 p->sadb_x_sa2_reserved2 = 0; 3572 p->sadb_x_sa2_sequence = seq; 3573 p->sadb_x_sa2_reqid = reqid; 3574 3575 return m; 3576 } 3577 3578 /* 3579 * set data into sadb_x_policy 3580 */ 3581 static struct mbuf * 3582 key_setsadbxpolicy(type, dir, id) 3583 u_int16_t type; 3584 u_int8_t dir; 3585 u_int32_t id; 3586 { 3587 struct mbuf *m; 3588 struct sadb_x_policy *p; 3589 size_t len; 3590 3591 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3592 m = key_alloc_mbuf(len); 3593 if (!m || m->m_next) { /*XXX*/ 3594 if (m) 3595 m_freem(m); 3596 return NULL; 3597 } 3598 3599 p = mtod(m, struct sadb_x_policy *); 3600 3601 bzero(p, len); 3602 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3603 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3604 p->sadb_x_policy_type = type; 3605 p->sadb_x_policy_dir = dir; 3606 p->sadb_x_policy_id = id; 3607 3608 return m; 3609 } 3610 3611 /* %%% utilities */ 3612 /* 3613 * copy a buffer into the new buffer allocated. 3614 */ 3615 static void * 3616 key_newbuf(src, len) 3617 const void *src; 3618 u_int len; 3619 { 3620 caddr_t new; 3621 3622 KMALLOC(new, caddr_t, len); 3623 if (new == NULL) { 3624 ipseclog((LOG_DEBUG, "key_newbuf: No more memory.\n")); 3625 return NULL; 3626 } 3627 bcopy(src, new, len); 3628 3629 return new; 3630 } 3631 3632 /* compare my own address 3633 * OUT: 1: true, i.e. my address. 3634 * 0: false 3635 */ 3636 int 3637 key_ismyaddr(sa) 3638 struct sockaddr *sa; 3639 { 3640 #ifdef INET 3641 struct sockaddr_in *sin; 3642 struct in_ifaddr *ia; 3643 #endif 3644 3645 /* sanity check */ 3646 if (sa == NULL) 3647 panic("key_ismyaddr: NULL pointer is passed.\n"); 3648 3649 switch (sa->sa_family) { 3650 #ifdef INET 3651 case AF_INET: 3652 sin = (struct sockaddr_in *)sa; 3653 for (ia = in_ifaddrhead.tqh_first; ia; 3654 ia = ia->ia_link.tqe_next) 3655 { 3656 if (sin->sin_family == ia->ia_addr.sin_family && 3657 sin->sin_len == ia->ia_addr.sin_len && 3658 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3659 { 3660 return 1; 3661 } 3662 } 3663 break; 3664 #endif 3665 #ifdef INET6 3666 case AF_INET6: 3667 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3668 #endif 3669 } 3670 3671 return 0; 3672 } 3673 3674 #ifdef INET6 3675 /* 3676 * compare my own address for IPv6. 3677 * 1: ours 3678 * 0: other 3679 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3680 */ 3681 #include <netinet6/in6_var.h> 3682 3683 static int 3684 key_ismyaddr6(sin6) 3685 struct sockaddr_in6 *sin6; 3686 { 3687 struct in6_ifaddr *ia; 3688 struct in6_multi *in6m; 3689 3690 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 3691 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3692 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3693 return 1; 3694 3695 /* 3696 * XXX Multicast 3697 * XXX why do we care about multlicast here while we don't care 3698 * about IPv4 multicast?? 3699 * XXX scope 3700 */ 3701 in6m = NULL; 3702 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3703 if (in6m) 3704 return 1; 3705 } 3706 3707 /* loopback, just for safety */ 3708 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3709 return 1; 3710 3711 return 0; 3712 } 3713 #endif /*INET6*/ 3714 3715 /* 3716 * compare two secasindex structure. 3717 * flag can specify to compare 2 saidxes. 3718 * compare two secasindex structure without both mode and reqid. 3719 * don't compare port. 3720 * IN: 3721 * saidx0: source, it can be in SAD. 3722 * saidx1: object. 3723 * OUT: 3724 * 1 : equal 3725 * 0 : not equal 3726 */ 3727 static int 3728 key_cmpsaidx( 3729 const struct secasindex *saidx0, 3730 const struct secasindex *saidx1, 3731 int flag) 3732 { 3733 /* sanity */ 3734 if (saidx0 == NULL && saidx1 == NULL) 3735 return 1; 3736 3737 if (saidx0 == NULL || saidx1 == NULL) 3738 return 0; 3739 3740 if (saidx0->proto != saidx1->proto) 3741 return 0; 3742 3743 if (flag == CMP_EXACTLY) { 3744 if (saidx0->mode != saidx1->mode) 3745 return 0; 3746 if (saidx0->reqid != saidx1->reqid) 3747 return 0; 3748 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3749 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3750 return 0; 3751 } else { 3752 3753 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3754 if (flag == CMP_MODE_REQID 3755 ||flag == CMP_REQID) { 3756 /* 3757 * If reqid of SPD is non-zero, unique SA is required. 3758 * The result must be of same reqid in this case. 3759 */ 3760 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3761 return 0; 3762 } 3763 3764 if (flag == CMP_MODE_REQID) { 3765 if (saidx0->mode != IPSEC_MODE_ANY 3766 && saidx0->mode != saidx1->mode) 3767 return 0; 3768 } 3769 3770 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3771 return 0; 3772 } 3773 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3774 return 0; 3775 } 3776 } 3777 3778 return 1; 3779 } 3780 3781 /* 3782 * compare two secindex structure exactly. 3783 * IN: 3784 * spidx0: source, it is often in SPD. 3785 * spidx1: object, it is often from PFKEY message. 3786 * OUT: 3787 * 1 : equal 3788 * 0 : not equal 3789 */ 3790 static int 3791 key_cmpspidx_exactly( 3792 struct secpolicyindex *spidx0, 3793 struct secpolicyindex *spidx1) 3794 { 3795 /* sanity */ 3796 if (spidx0 == NULL && spidx1 == NULL) 3797 return 1; 3798 3799 if (spidx0 == NULL || spidx1 == NULL) 3800 return 0; 3801 3802 if (spidx0->prefs != spidx1->prefs 3803 || spidx0->prefd != spidx1->prefd 3804 || spidx0->ul_proto != spidx1->ul_proto) 3805 return 0; 3806 3807 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3808 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3809 } 3810 3811 /* 3812 * compare two secindex structure with mask. 3813 * IN: 3814 * spidx0: source, it is often in SPD. 3815 * spidx1: object, it is often from IP header. 3816 * OUT: 3817 * 1 : equal 3818 * 0 : not equal 3819 */ 3820 static int 3821 key_cmpspidx_withmask( 3822 struct secpolicyindex *spidx0, 3823 struct secpolicyindex *spidx1) 3824 { 3825 /* sanity */ 3826 if (spidx0 == NULL && spidx1 == NULL) 3827 return 1; 3828 3829 if (spidx0 == NULL || spidx1 == NULL) 3830 return 0; 3831 3832 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3833 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3834 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3835 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3836 return 0; 3837 3838 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3839 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3840 && spidx0->ul_proto != spidx1->ul_proto) 3841 return 0; 3842 3843 switch (spidx0->src.sa.sa_family) { 3844 case AF_INET: 3845 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3846 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3847 return 0; 3848 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3849 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3850 return 0; 3851 break; 3852 case AF_INET6: 3853 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3854 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3855 return 0; 3856 /* 3857 * scope_id check. if sin6_scope_id is 0, we regard it 3858 * as a wildcard scope, which matches any scope zone ID. 3859 */ 3860 if (spidx0->src.sin6.sin6_scope_id && 3861 spidx1->src.sin6.sin6_scope_id && 3862 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3863 return 0; 3864 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3865 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3866 return 0; 3867 break; 3868 default: 3869 /* XXX */ 3870 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3871 return 0; 3872 break; 3873 } 3874 3875 switch (spidx0->dst.sa.sa_family) { 3876 case AF_INET: 3877 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3878 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3879 return 0; 3880 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3881 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3882 return 0; 3883 break; 3884 case AF_INET6: 3885 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3886 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3887 return 0; 3888 /* 3889 * scope_id check. if sin6_scope_id is 0, we regard it 3890 * as a wildcard scope, which matches any scope zone ID. 3891 */ 3892 if (spidx0->src.sin6.sin6_scope_id && 3893 spidx1->src.sin6.sin6_scope_id && 3894 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3895 return 0; 3896 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3897 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3898 return 0; 3899 break; 3900 default: 3901 /* XXX */ 3902 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3903 return 0; 3904 break; 3905 } 3906 3907 /* XXX Do we check other field ? e.g. flowinfo */ 3908 3909 return 1; 3910 } 3911 3912 /* returns 0 on match */ 3913 static int 3914 key_sockaddrcmp( 3915 const struct sockaddr *sa1, 3916 const struct sockaddr *sa2, 3917 int port) 3918 { 3919 #ifdef satosin 3920 #undef satosin 3921 #endif 3922 #define satosin(s) ((const struct sockaddr_in *)s) 3923 #ifdef satosin6 3924 #undef satosin6 3925 #endif 3926 #define satosin6(s) ((const struct sockaddr_in6 *)s) 3927 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 3928 return 1; 3929 3930 switch (sa1->sa_family) { 3931 case AF_INET: 3932 if (sa1->sa_len != sizeof(struct sockaddr_in)) 3933 return 1; 3934 if (satosin(sa1)->sin_addr.s_addr != 3935 satosin(sa2)->sin_addr.s_addr) { 3936 return 1; 3937 } 3938 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 3939 return 1; 3940 break; 3941 case AF_INET6: 3942 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 3943 return 1; /*EINVAL*/ 3944 if (satosin6(sa1)->sin6_scope_id != 3945 satosin6(sa2)->sin6_scope_id) { 3946 return 1; 3947 } 3948 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 3949 &satosin6(sa2)->sin6_addr)) { 3950 return 1; 3951 } 3952 if (port && 3953 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 3954 return 1; 3955 } 3956 default: 3957 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 3958 return 1; 3959 break; 3960 } 3961 3962 return 0; 3963 #undef satosin 3964 #undef satosin6 3965 } 3966 3967 /* 3968 * compare two buffers with mask. 3969 * IN: 3970 * addr1: source 3971 * addr2: object 3972 * bits: Number of bits to compare 3973 * OUT: 3974 * 1 : equal 3975 * 0 : not equal 3976 */ 3977 static int 3978 key_bbcmp(const void *a1, const void *a2, u_int bits) 3979 { 3980 const unsigned char *p1 = a1; 3981 const unsigned char *p2 = a2; 3982 3983 /* XXX: This could be considerably faster if we compare a word 3984 * at a time, but it is complicated on LSB Endian machines */ 3985 3986 /* Handle null pointers */ 3987 if (p1 == NULL || p2 == NULL) 3988 return (p1 == p2); 3989 3990 while (bits >= 8) { 3991 if (*p1++ != *p2++) 3992 return 0; 3993 bits -= 8; 3994 } 3995 3996 if (bits > 0) { 3997 u_int8_t mask = ~((1<<(8-bits))-1); 3998 if ((*p1 & mask) != (*p2 & mask)) 3999 return 0; 4000 } 4001 return 1; /* Match! */ 4002 } 4003 4004 /* 4005 * time handler. 4006 * scanning SPD and SAD to check status for each entries, 4007 * and do to remove or to expire. 4008 * XXX: year 2038 problem may remain. 4009 */ 4010 void 4011 key_timehandler(void) 4012 { 4013 u_int dir; 4014 int s; 4015 time_t now = time_second; 4016 4017 s = splnet(); /*called from softclock()*/ 4018 4019 /* SPD */ 4020 { 4021 struct secpolicy *sp, *nextsp; 4022 4023 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4024 for (sp = LIST_FIRST(&sptree[dir]); 4025 sp != NULL; 4026 sp = nextsp) { 4027 4028 nextsp = LIST_NEXT(sp, chain); 4029 4030 if (sp->state == IPSEC_SPSTATE_DEAD) { 4031 KEY_FREESP(&sp); 4032 continue; 4033 } 4034 4035 if (sp->lifetime == 0 && sp->validtime == 0) 4036 continue; 4037 4038 /* the deletion will occur next time */ 4039 if ((sp->lifetime && now - sp->created > sp->lifetime) 4040 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4041 sp->state = IPSEC_SPSTATE_DEAD; 4042 key_spdexpire(sp); 4043 continue; 4044 } 4045 } 4046 } 4047 } 4048 4049 /* SAD */ 4050 { 4051 struct secashead *sah, *nextsah; 4052 struct secasvar *sav, *nextsav; 4053 4054 for (sah = LIST_FIRST(&sahtree); 4055 sah != NULL; 4056 sah = nextsah) { 4057 4058 nextsah = LIST_NEXT(sah, chain); 4059 4060 /* if sah has been dead, then delete it and process next sah. */ 4061 if (sah->state == SADB_SASTATE_DEAD) { 4062 key_delsah(sah); 4063 continue; 4064 } 4065 4066 /* if LARVAL entry doesn't become MATURE, delete it. */ 4067 for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_LARVAL]); 4068 sav != NULL; 4069 sav = nextsav) { 4070 4071 nextsav = LIST_NEXT(sav, chain); 4072 4073 if (now - sav->created > key_larval_lifetime) { 4074 KEY_FREESAV(&sav); 4075 } 4076 } 4077 4078 /* 4079 * check MATURE entry to start to send expire message 4080 * whether or not. 4081 */ 4082 for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_MATURE]); 4083 sav != NULL; 4084 sav = nextsav) { 4085 4086 nextsav = LIST_NEXT(sav, chain); 4087 4088 /* we don't need to check. */ 4089 if (sav->lft_s == NULL) 4090 continue; 4091 4092 /* sanity check */ 4093 if (sav->lft_c == NULL) { 4094 ipseclog((LOG_DEBUG,"key_timehandler: " 4095 "There is no CURRENT time, why?\n")); 4096 continue; 4097 } 4098 4099 /* check SOFT lifetime */ 4100 if (sav->lft_s->sadb_lifetime_addtime != 0 4101 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) { 4102 /* 4103 * check SA to be used whether or not. 4104 * when SA hasn't been used, delete it. 4105 */ 4106 if (sav->lft_c->sadb_lifetime_usetime == 0) { 4107 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4108 KEY_FREESAV(&sav); 4109 } else { 4110 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4111 /* 4112 * XXX If we keep to send expire 4113 * message in the status of 4114 * DYING. Do remove below code. 4115 */ 4116 key_expire(sav); 4117 } 4118 } 4119 /* check SOFT lifetime by bytes */ 4120 /* 4121 * XXX I don't know the way to delete this SA 4122 * when new SA is installed. Caution when it's 4123 * installed too big lifetime by time. 4124 */ 4125 else if (sav->lft_s->sadb_lifetime_bytes != 0 4126 && sav->lft_s->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) { 4127 4128 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4129 /* 4130 * XXX If we keep to send expire 4131 * message in the status of 4132 * DYING. Do remove below code. 4133 */ 4134 key_expire(sav); 4135 } 4136 } 4137 4138 /* check DYING entry to change status to DEAD. */ 4139 for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_DYING]); 4140 sav != NULL; 4141 sav = nextsav) { 4142 4143 nextsav = LIST_NEXT(sav, chain); 4144 4145 /* we don't need to check. */ 4146 if (sav->lft_h == NULL) 4147 continue; 4148 4149 /* sanity check */ 4150 if (sav->lft_c == NULL) { 4151 ipseclog((LOG_DEBUG, "key_timehandler: " 4152 "There is no CURRENT time, why?\n")); 4153 continue; 4154 } 4155 4156 if (sav->lft_h->sadb_lifetime_addtime != 0 4157 && now - sav->created > sav->lft_h->sadb_lifetime_addtime) { 4158 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4159 KEY_FREESAV(&sav); 4160 } 4161 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4162 else if (sav->lft_s != NULL 4163 && sav->lft_s->sadb_lifetime_addtime != 0 4164 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) { 4165 /* 4166 * XXX: should be checked to be 4167 * installed the valid SA. 4168 */ 4169 4170 /* 4171 * If there is no SA then sending 4172 * expire message. 4173 */ 4174 key_expire(sav); 4175 } 4176 #endif 4177 /* check HARD lifetime by bytes */ 4178 else if (sav->lft_h->sadb_lifetime_bytes != 0 4179 && sav->lft_h->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) { 4180 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4181 KEY_FREESAV(&sav); 4182 } 4183 } 4184 4185 /* delete entry in DEAD */ 4186 for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_DEAD]); 4187 sav != NULL; 4188 sav = nextsav) { 4189 4190 nextsav = LIST_NEXT(sav, chain); 4191 4192 /* sanity check */ 4193 if (sav->state != SADB_SASTATE_DEAD) { 4194 ipseclog((LOG_DEBUG, "key_timehandler: " 4195 "invalid sav->state " 4196 "(queue: %d SA: %d): " 4197 "kill it anyway\n", 4198 SADB_SASTATE_DEAD, sav->state)); 4199 } 4200 4201 /* 4202 * do not call key_freesav() here. 4203 * sav should already be freed, and sav->refcnt 4204 * shows other references to sav 4205 * (such as from SPD). 4206 */ 4207 } 4208 } 4209 } 4210 4211 #ifndef IPSEC_NONBLOCK_ACQUIRE 4212 /* ACQ tree */ 4213 { 4214 struct secacq *acq, *nextacq; 4215 4216 for (acq = LIST_FIRST(&acqtree); 4217 acq != NULL; 4218 acq = nextacq) { 4219 4220 nextacq = LIST_NEXT(acq, chain); 4221 4222 if (now - acq->created > key_blockacq_lifetime 4223 && __LIST_CHAINED(acq)) { 4224 LIST_REMOVE(acq, chain); 4225 KFREE(acq); 4226 } 4227 } 4228 } 4229 #endif 4230 4231 /* SP ACQ tree */ 4232 { 4233 struct secspacq *acq, *nextacq; 4234 4235 for (acq = LIST_FIRST(&spacqtree); 4236 acq != NULL; 4237 acq = nextacq) { 4238 4239 nextacq = LIST_NEXT(acq, chain); 4240 4241 if (now - acq->created > key_blockacq_lifetime 4242 && __LIST_CHAINED(acq)) { 4243 LIST_REMOVE(acq, chain); 4244 KFREE(acq); 4245 } 4246 } 4247 } 4248 4249 /* initialize random seed */ 4250 if (key_tick_init_random++ > key_int_random) { 4251 key_tick_init_random = 0; 4252 key_srandom(); 4253 } 4254 4255 #ifndef IPSEC_DEBUG2 4256 /* do exchange to tick time !! */ 4257 (void)timeout((void *)key_timehandler, (void *)0, hz); 4258 #endif /* IPSEC_DEBUG2 */ 4259 4260 splx(s); 4261 return; 4262 } 4263 4264 /* 4265 * to initialize a seed for random() 4266 */ 4267 static void 4268 key_srandom() 4269 { 4270 #if 0 /* Already called in kern/init_main.c:proc0_post() */ 4271 srandom(time_second); 4272 #endif 4273 } 4274 4275 u_long 4276 key_random() 4277 { 4278 u_long value; 4279 4280 key_randomfill(&value, sizeof(value)); 4281 return value; 4282 } 4283 4284 void 4285 key_randomfill(p, l) 4286 void *p; 4287 size_t l; 4288 { 4289 size_t n; 4290 u_long v; 4291 static int warn = 1; 4292 4293 n = 0; 4294 n = (size_t)read_random(p, (u_int)l); 4295 /* last resort */ 4296 while (n < l) { 4297 v = random(); 4298 bcopy(&v, (u_int8_t *)p + n, 4299 l - n < sizeof(v) ? l - n : sizeof(v)); 4300 n += sizeof(v); 4301 4302 if (warn) { 4303 printf("WARNING: pseudo-random number generator " 4304 "used for IPsec processing\n"); 4305 warn = 0; 4306 } 4307 } 4308 } 4309 4310 /* 4311 * map SADB_SATYPE_* to IPPROTO_*. 4312 * if satype == SADB_SATYPE then satype is mapped to ~0. 4313 * OUT: 4314 * 0: invalid satype. 4315 */ 4316 static u_int16_t 4317 key_satype2proto(satype) 4318 u_int8_t satype; 4319 { 4320 switch (satype) { 4321 case SADB_SATYPE_UNSPEC: 4322 return IPSEC_PROTO_ANY; 4323 case SADB_SATYPE_AH: 4324 return IPPROTO_AH; 4325 case SADB_SATYPE_ESP: 4326 return IPPROTO_ESP; 4327 case SADB_X_SATYPE_IPCOMP: 4328 return IPPROTO_IPCOMP; 4329 default: 4330 return 0; 4331 } 4332 /* NOTREACHED */ 4333 } 4334 4335 /* 4336 * map IPPROTO_* to SADB_SATYPE_* 4337 * OUT: 4338 * 0: invalid protocol type. 4339 */ 4340 static u_int8_t 4341 key_proto2satype(proto) 4342 u_int16_t proto; 4343 { 4344 switch (proto) { 4345 case IPPROTO_AH: 4346 return SADB_SATYPE_AH; 4347 case IPPROTO_ESP: 4348 return SADB_SATYPE_ESP; 4349 case IPPROTO_IPCOMP: 4350 return SADB_X_SATYPE_IPCOMP; 4351 default: 4352 return 0; 4353 } 4354 /* NOTREACHED */ 4355 } 4356 4357 /* %%% PF_KEY */ 4358 /* 4359 * SADB_GETSPI processing is to receive 4360 * <base, (SA2), src address, dst address, (SPI range)> 4361 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4362 * tree with the status of LARVAL, and send 4363 * <base, SA(*), address(SD)> 4364 * to the IKMPd. 4365 * 4366 * IN: mhp: pointer to the pointer to each header. 4367 * OUT: NULL if fail. 4368 * other if success, return pointer to the message to send. 4369 */ 4370 static int 4371 key_getspi(so, m, mhp) 4372 struct socket *so; 4373 struct mbuf *m; 4374 const struct sadb_msghdr *mhp; 4375 { 4376 struct sadb_address *src0, *dst0; 4377 struct secasindex saidx; 4378 struct secashead *newsah; 4379 struct secasvar *newsav; 4380 u_int8_t proto; 4381 u_int32_t spi; 4382 u_int8_t mode; 4383 u_int32_t reqid; 4384 int error; 4385 4386 /* sanity check */ 4387 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 4388 panic("key_getspi: NULL pointer is passed.\n"); 4389 4390 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4391 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4392 ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n")); 4393 return key_senderror(so, m, EINVAL); 4394 } 4395 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4396 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4397 ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n")); 4398 return key_senderror(so, m, EINVAL); 4399 } 4400 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4401 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4402 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4403 } else { 4404 mode = IPSEC_MODE_ANY; 4405 reqid = 0; 4406 } 4407 4408 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4409 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4410 4411 /* map satype to proto */ 4412 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4413 ipseclog((LOG_DEBUG, "key_getspi: invalid satype is passed.\n")); 4414 return key_senderror(so, m, EINVAL); 4415 } 4416 4417 /* make sure if port number is zero. */ 4418 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4419 case AF_INET: 4420 if (((struct sockaddr *)(src0 + 1))->sa_len != 4421 sizeof(struct sockaddr_in)) 4422 return key_senderror(so, m, EINVAL); 4423 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4424 break; 4425 case AF_INET6: 4426 if (((struct sockaddr *)(src0 + 1))->sa_len != 4427 sizeof(struct sockaddr_in6)) 4428 return key_senderror(so, m, EINVAL); 4429 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4430 break; 4431 default: 4432 ; /*???*/ 4433 } 4434 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4435 case AF_INET: 4436 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4437 sizeof(struct sockaddr_in)) 4438 return key_senderror(so, m, EINVAL); 4439 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4440 break; 4441 case AF_INET6: 4442 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4443 sizeof(struct sockaddr_in6)) 4444 return key_senderror(so, m, EINVAL); 4445 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4446 break; 4447 default: 4448 ; /*???*/ 4449 } 4450 4451 /* XXX boundary check against sa_len */ 4452 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4453 4454 /* SPI allocation */ 4455 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4456 &saidx); 4457 if (spi == 0) 4458 return key_senderror(so, m, EINVAL); 4459 4460 /* get a SA index */ 4461 if ((newsah = key_getsah(&saidx)) == NULL) { 4462 /* create a new SA index */ 4463 if ((newsah = key_newsah(&saidx)) == NULL) { 4464 ipseclog((LOG_DEBUG, "key_getspi: No more memory.\n")); 4465 return key_senderror(so, m, ENOBUFS); 4466 } 4467 } 4468 4469 /* get a new SA */ 4470 /* XXX rewrite */ 4471 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4472 if (newsav == NULL) { 4473 /* XXX don't free new SA index allocated in above. */ 4474 return key_senderror(so, m, error); 4475 } 4476 4477 /* set spi */ 4478 newsav->spi = htonl(spi); 4479 4480 #ifndef IPSEC_NONBLOCK_ACQUIRE 4481 /* delete the entry in acqtree */ 4482 if (mhp->msg->sadb_msg_seq != 0) { 4483 struct secacq *acq; 4484 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4485 /* reset counter in order to deletion by timehandler. */ 4486 acq->created = time_second; 4487 acq->count = 0; 4488 } 4489 } 4490 #endif 4491 4492 { 4493 struct mbuf *n, *nn; 4494 struct sadb_sa *m_sa; 4495 struct sadb_msg *newmsg; 4496 int off, len; 4497 4498 /* create new sadb_msg to reply. */ 4499 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4500 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4501 if (len > MCLBYTES) 4502 return key_senderror(so, m, ENOBUFS); 4503 4504 MGETHDR(n, M_DONTWAIT, MT_DATA); 4505 if (len > MHLEN) { 4506 MCLGET(n, M_DONTWAIT); 4507 if ((n->m_flags & M_EXT) == 0) { 4508 m_freem(n); 4509 n = NULL; 4510 } 4511 } 4512 if (!n) 4513 return key_senderror(so, m, ENOBUFS); 4514 4515 n->m_len = len; 4516 n->m_next = NULL; 4517 off = 0; 4518 4519 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4520 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4521 4522 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4523 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4524 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4525 m_sa->sadb_sa_spi = htonl(spi); 4526 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4527 4528 #ifdef DIAGNOSTIC 4529 if (off != len) 4530 panic("length inconsistency in key_getspi"); 4531 #endif 4532 4533 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4534 SADB_EXT_ADDRESS_DST); 4535 if (!n->m_next) { 4536 m_freem(n); 4537 return key_senderror(so, m, ENOBUFS); 4538 } 4539 4540 if (n->m_len < sizeof(struct sadb_msg)) { 4541 n = m_pullup(n, sizeof(struct sadb_msg)); 4542 if (n == NULL) 4543 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4544 } 4545 4546 n->m_pkthdr.len = 0; 4547 for (nn = n; nn; nn = nn->m_next) 4548 n->m_pkthdr.len += nn->m_len; 4549 4550 newmsg = mtod(n, struct sadb_msg *); 4551 newmsg->sadb_msg_seq = newsav->seq; 4552 newmsg->sadb_msg_errno = 0; 4553 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4554 4555 m_freem(m); 4556 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4557 } 4558 } 4559 4560 /* 4561 * allocating new SPI 4562 * called by key_getspi(). 4563 * OUT: 4564 * 0: failure. 4565 * others: success. 4566 */ 4567 static u_int32_t 4568 key_do_getnewspi(spirange, saidx) 4569 struct sadb_spirange *spirange; 4570 struct secasindex *saidx; 4571 { 4572 u_int32_t newspi; 4573 u_int32_t min, max; 4574 int count = key_spi_trycnt; 4575 4576 /* set spi range to allocate */ 4577 if (spirange != NULL) { 4578 min = spirange->sadb_spirange_min; 4579 max = spirange->sadb_spirange_max; 4580 } else { 4581 min = key_spi_minval; 4582 max = key_spi_maxval; 4583 } 4584 /* IPCOMP needs 2-byte SPI */ 4585 if (saidx->proto == IPPROTO_IPCOMP) { 4586 u_int32_t t; 4587 if (min >= 0x10000) 4588 min = 0xffff; 4589 if (max >= 0x10000) 4590 max = 0xffff; 4591 if (min > max) { 4592 t = min; min = max; max = t; 4593 } 4594 } 4595 4596 if (min == max) { 4597 if (key_checkspidup(saidx, min) != NULL) { 4598 ipseclog((LOG_DEBUG, "key_do_getnewspi: SPI %u exists already.\n", min)); 4599 return 0; 4600 } 4601 4602 count--; /* taking one cost. */ 4603 newspi = min; 4604 4605 } else { 4606 4607 /* init SPI */ 4608 newspi = 0; 4609 4610 /* when requesting to allocate spi ranged */ 4611 while (count--) { 4612 /* generate pseudo-random SPI value ranged. */ 4613 newspi = min + (key_random() % (max - min + 1)); 4614 4615 if (key_checkspidup(saidx, newspi) == NULL) 4616 break; 4617 } 4618 4619 if (count == 0 || newspi == 0) { 4620 ipseclog((LOG_DEBUG, "key_do_getnewspi: to allocate spi is failed.\n")); 4621 return 0; 4622 } 4623 } 4624 4625 /* statistics */ 4626 keystat.getspi_count = 4627 (keystat.getspi_count + key_spi_trycnt - count) / 2; 4628 4629 return newspi; 4630 } 4631 4632 /* 4633 * SADB_UPDATE processing 4634 * receive 4635 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4636 * key(AE), (identity(SD),) (sensitivity)> 4637 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4638 * and send 4639 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4640 * (identity(SD),) (sensitivity)> 4641 * to the ikmpd. 4642 * 4643 * m will always be freed. 4644 */ 4645 static int 4646 key_update(so, m, mhp) 4647 struct socket *so; 4648 struct mbuf *m; 4649 const struct sadb_msghdr *mhp; 4650 { 4651 struct sadb_sa *sa0; 4652 struct sadb_address *src0, *dst0; 4653 struct secasindex saidx; 4654 struct secashead *sah; 4655 struct secasvar *sav; 4656 u_int16_t proto; 4657 u_int8_t mode; 4658 u_int32_t reqid; 4659 int error; 4660 4661 /* sanity check */ 4662 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 4663 panic("key_update: NULL pointer is passed.\n"); 4664 4665 /* map satype to proto */ 4666 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4667 ipseclog((LOG_DEBUG, "key_update: invalid satype is passed.\n")); 4668 return key_senderror(so, m, EINVAL); 4669 } 4670 4671 if (mhp->ext[SADB_EXT_SA] == NULL || 4672 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4673 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4674 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4675 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4676 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4677 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4678 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4679 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4680 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4681 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4682 ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n")); 4683 return key_senderror(so, m, EINVAL); 4684 } 4685 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4686 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4687 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4688 ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n")); 4689 return key_senderror(so, m, EINVAL); 4690 } 4691 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4692 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4693 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4694 } else { 4695 mode = IPSEC_MODE_ANY; 4696 reqid = 0; 4697 } 4698 /* XXX boundary checking for other extensions */ 4699 4700 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4701 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4702 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4703 4704 /* XXX boundary check against sa_len */ 4705 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4706 4707 /* get a SA header */ 4708 if ((sah = key_getsah(&saidx)) == NULL) { 4709 ipseclog((LOG_DEBUG, "key_update: no SA index found.\n")); 4710 return key_senderror(so, m, ENOENT); 4711 } 4712 4713 /* set spidx if there */ 4714 /* XXX rewrite */ 4715 error = key_setident(sah, m, mhp); 4716 if (error) 4717 return key_senderror(so, m, error); 4718 4719 /* find a SA with sequence number. */ 4720 #ifdef IPSEC_DOSEQCHECK 4721 if (mhp->msg->sadb_msg_seq != 0 4722 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4723 ipseclog((LOG_DEBUG, 4724 "key_update: no larval SA with sequence %u exists.\n", 4725 mhp->msg->sadb_msg_seq)); 4726 return key_senderror(so, m, ENOENT); 4727 } 4728 #else 4729 if ((sav = key_getsavbyspi(sah, sa0->sadb_sa_spi)) == NULL) { 4730 ipseclog((LOG_DEBUG, 4731 "key_update: no such a SA found (spi:%u)\n", 4732 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4733 return key_senderror(so, m, EINVAL); 4734 } 4735 #endif 4736 4737 /* validity check */ 4738 if (sav->sah->saidx.proto != proto) { 4739 ipseclog((LOG_DEBUG, 4740 "key_update: protocol mismatched (DB=%u param=%u)\n", 4741 sav->sah->saidx.proto, proto)); 4742 return key_senderror(so, m, EINVAL); 4743 } 4744 #ifdef IPSEC_DOSEQCHECK 4745 if (sav->spi != sa0->sadb_sa_spi) { 4746 ipseclog((LOG_DEBUG, 4747 "key_update: SPI mismatched (DB:%u param:%u)\n", 4748 (u_int32_t)ntohl(sav->spi), 4749 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4750 return key_senderror(so, m, EINVAL); 4751 } 4752 #endif 4753 if (sav->pid != mhp->msg->sadb_msg_pid) { 4754 ipseclog((LOG_DEBUG, 4755 "key_update: pid mismatched (DB:%u param:%u)\n", 4756 sav->pid, mhp->msg->sadb_msg_pid)); 4757 return key_senderror(so, m, EINVAL); 4758 } 4759 4760 /* copy sav values */ 4761 error = key_setsaval(sav, m, mhp); 4762 if (error) { 4763 KEY_FREESAV(&sav); 4764 return key_senderror(so, m, error); 4765 } 4766 4767 /* check SA values to be mature. */ 4768 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4769 KEY_FREESAV(&sav); 4770 return key_senderror(so, m, 0); 4771 } 4772 4773 { 4774 struct mbuf *n; 4775 4776 /* set msg buf from mhp */ 4777 n = key_getmsgbuf_x1(m, mhp); 4778 if (n == NULL) { 4779 ipseclog((LOG_DEBUG, "key_update: No more memory.\n")); 4780 return key_senderror(so, m, ENOBUFS); 4781 } 4782 4783 m_freem(m); 4784 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4785 } 4786 } 4787 4788 /* 4789 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4790 * only called by key_update(). 4791 * OUT: 4792 * NULL : not found 4793 * others : found, pointer to a SA. 4794 */ 4795 #ifdef IPSEC_DOSEQCHECK 4796 static struct secasvar * 4797 key_getsavbyseq(sah, seq) 4798 struct secashead *sah; 4799 u_int32_t seq; 4800 { 4801 struct secasvar *sav; 4802 u_int state; 4803 4804 state = SADB_SASTATE_LARVAL; 4805 4806 /* search SAD with sequence number ? */ 4807 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4808 4809 KEY_CHKSASTATE(state, sav->state, "key_getsabyseq"); 4810 4811 if (sav->seq == seq) { 4812 SA_ADDREF(sav); 4813 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4814 printf("DP key_getsavbyseq cause " 4815 "refcnt++:%d SA:%p\n", 4816 sav->refcnt, sav)); 4817 return sav; 4818 } 4819 } 4820 4821 return NULL; 4822 } 4823 #endif 4824 4825 /* 4826 * SADB_ADD processing 4827 * add an entry to SA database, when received 4828 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4829 * key(AE), (identity(SD),) (sensitivity)> 4830 * from the ikmpd, 4831 * and send 4832 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4833 * (identity(SD),) (sensitivity)> 4834 * to the ikmpd. 4835 * 4836 * IGNORE identity and sensitivity messages. 4837 * 4838 * m will always be freed. 4839 */ 4840 static int 4841 key_add(so, m, mhp) 4842 struct socket *so; 4843 struct mbuf *m; 4844 const struct sadb_msghdr *mhp; 4845 { 4846 struct sadb_sa *sa0; 4847 struct sadb_address *src0, *dst0; 4848 struct secasindex saidx; 4849 struct secashead *newsah; 4850 struct secasvar *newsav; 4851 u_int16_t proto; 4852 u_int8_t mode; 4853 u_int32_t reqid; 4854 int error; 4855 4856 /* sanity check */ 4857 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 4858 panic("key_add: NULL pointer is passed.\n"); 4859 4860 /* map satype to proto */ 4861 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4862 ipseclog((LOG_DEBUG, "key_add: invalid satype is passed.\n")); 4863 return key_senderror(so, m, EINVAL); 4864 } 4865 4866 if (mhp->ext[SADB_EXT_SA] == NULL || 4867 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4868 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4869 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4870 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4871 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4872 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4873 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4874 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4875 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4876 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4877 ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n")); 4878 return key_senderror(so, m, EINVAL); 4879 } 4880 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4881 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4882 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4883 /* XXX need more */ 4884 ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n")); 4885 return key_senderror(so, m, EINVAL); 4886 } 4887 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4888 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4889 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4890 } else { 4891 mode = IPSEC_MODE_ANY; 4892 reqid = 0; 4893 } 4894 4895 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4896 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4897 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4898 4899 /* XXX boundary check against sa_len */ 4900 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4901 4902 /* get a SA header */ 4903 if ((newsah = key_getsah(&saidx)) == NULL) { 4904 /* create a new SA header */ 4905 if ((newsah = key_newsah(&saidx)) == NULL) { 4906 ipseclog((LOG_DEBUG, "key_add: No more memory.\n")); 4907 return key_senderror(so, m, ENOBUFS); 4908 } 4909 } 4910 4911 /* set spidx if there */ 4912 /* XXX rewrite */ 4913 error = key_setident(newsah, m, mhp); 4914 if (error) { 4915 return key_senderror(so, m, error); 4916 } 4917 4918 /* create new SA entry. */ 4919 /* We can create new SA only if SPI is differenct. */ 4920 if (key_getsavbyspi(newsah, sa0->sadb_sa_spi)) { 4921 ipseclog((LOG_DEBUG, "key_add: SA already exists.\n")); 4922 return key_senderror(so, m, EEXIST); 4923 } 4924 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4925 if (newsav == NULL) { 4926 return key_senderror(so, m, error); 4927 } 4928 4929 /* check SA values to be mature. */ 4930 if ((error = key_mature(newsav)) != 0) { 4931 KEY_FREESAV(&newsav); 4932 return key_senderror(so, m, error); 4933 } 4934 4935 /* 4936 * don't call key_freesav() here, as we would like to keep the SA 4937 * in the database on success. 4938 */ 4939 4940 { 4941 struct mbuf *n; 4942 4943 /* set msg buf from mhp */ 4944 n = key_getmsgbuf_x1(m, mhp); 4945 if (n == NULL) { 4946 ipseclog((LOG_DEBUG, "key_update: No more memory.\n")); 4947 return key_senderror(so, m, ENOBUFS); 4948 } 4949 4950 m_freem(m); 4951 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4952 } 4953 } 4954 4955 /* m is retained */ 4956 static int 4957 key_setident(sah, m, mhp) 4958 struct secashead *sah; 4959 struct mbuf *m; 4960 const struct sadb_msghdr *mhp; 4961 { 4962 const struct sadb_ident *idsrc, *iddst; 4963 int idsrclen, iddstlen; 4964 4965 /* sanity check */ 4966 if (sah == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 4967 panic("key_setident: NULL pointer is passed.\n"); 4968 4969 /* don't make buffer if not there */ 4970 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 4971 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 4972 sah->idents = NULL; 4973 sah->identd = NULL; 4974 return 0; 4975 } 4976 4977 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 4978 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 4979 ipseclog((LOG_DEBUG, "key_setident: invalid identity.\n")); 4980 return EINVAL; 4981 } 4982 4983 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 4984 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 4985 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 4986 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 4987 4988 /* validity check */ 4989 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 4990 ipseclog((LOG_DEBUG, "key_setident: ident type mismatch.\n")); 4991 return EINVAL; 4992 } 4993 4994 switch (idsrc->sadb_ident_type) { 4995 case SADB_IDENTTYPE_PREFIX: 4996 case SADB_IDENTTYPE_FQDN: 4997 case SADB_IDENTTYPE_USERFQDN: 4998 default: 4999 /* XXX do nothing */ 5000 sah->idents = NULL; 5001 sah->identd = NULL; 5002 return 0; 5003 } 5004 5005 /* make structure */ 5006 KMALLOC(sah->idents, struct sadb_ident *, idsrclen); 5007 if (sah->idents == NULL) { 5008 ipseclog((LOG_DEBUG, "key_setident: No more memory.\n")); 5009 return ENOBUFS; 5010 } 5011 KMALLOC(sah->identd, struct sadb_ident *, iddstlen); 5012 if (sah->identd == NULL) { 5013 KFREE(sah->idents); 5014 sah->idents = NULL; 5015 ipseclog((LOG_DEBUG, "key_setident: No more memory.\n")); 5016 return ENOBUFS; 5017 } 5018 bcopy(idsrc, sah->idents, idsrclen); 5019 bcopy(iddst, sah->identd, iddstlen); 5020 5021 return 0; 5022 } 5023 5024 /* 5025 * m will not be freed on return. 5026 * it is caller's responsibility to free the result. 5027 */ 5028 static struct mbuf * 5029 key_getmsgbuf_x1(m, mhp) 5030 struct mbuf *m; 5031 const struct sadb_msghdr *mhp; 5032 { 5033 struct mbuf *n; 5034 5035 /* sanity check */ 5036 if (m == NULL || mhp == NULL || mhp->msg == NULL) 5037 panic("key_getmsgbuf_x1: NULL pointer is passed.\n"); 5038 5039 /* create new sadb_msg to reply. */ 5040 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5041 SADB_EXT_SA, SADB_X_EXT_SA2, 5042 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5043 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5044 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5045 if (!n) 5046 return NULL; 5047 5048 if (n->m_len < sizeof(struct sadb_msg)) { 5049 n = m_pullup(n, sizeof(struct sadb_msg)); 5050 if (n == NULL) 5051 return NULL; 5052 } 5053 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5054 mtod(n, struct sadb_msg *)->sadb_msg_len = 5055 PFKEY_UNIT64(n->m_pkthdr.len); 5056 5057 return n; 5058 } 5059 5060 static int key_delete_all __P((struct socket *, struct mbuf *, 5061 const struct sadb_msghdr *, u_int16_t)); 5062 5063 /* 5064 * SADB_DELETE processing 5065 * receive 5066 * <base, SA(*), address(SD)> 5067 * from the ikmpd, and set SADB_SASTATE_DEAD, 5068 * and send, 5069 * <base, SA(*), address(SD)> 5070 * to the ikmpd. 5071 * 5072 * m will always be freed. 5073 */ 5074 static int 5075 key_delete(so, m, mhp) 5076 struct socket *so; 5077 struct mbuf *m; 5078 const struct sadb_msghdr *mhp; 5079 { 5080 struct sadb_sa *sa0; 5081 struct sadb_address *src0, *dst0; 5082 struct secasindex saidx; 5083 struct secashead *sah; 5084 struct secasvar *sav = NULL; 5085 u_int16_t proto; 5086 5087 /* sanity check */ 5088 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 5089 panic("key_delete: NULL pointer is passed.\n"); 5090 5091 /* map satype to proto */ 5092 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5093 ipseclog((LOG_DEBUG, "key_delete: invalid satype is passed.\n")); 5094 return key_senderror(so, m, EINVAL); 5095 } 5096 5097 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5098 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5099 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n")); 5100 return key_senderror(so, m, EINVAL); 5101 } 5102 5103 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5104 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5105 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n")); 5106 return key_senderror(so, m, EINVAL); 5107 } 5108 5109 if (mhp->ext[SADB_EXT_SA] == NULL) { 5110 /* 5111 * Caller wants us to delete all non-LARVAL SAs 5112 * that match the src/dst. This is used during 5113 * IKE INITIAL-CONTACT. 5114 */ 5115 ipseclog((LOG_DEBUG, "key_delete: doing delete all.\n")); 5116 return key_delete_all(so, m, mhp, proto); 5117 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5118 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n")); 5119 return key_senderror(so, m, EINVAL); 5120 } 5121 5122 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5123 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5124 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5125 5126 /* XXX boundary check against sa_len */ 5127 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5128 5129 /* get a SA header */ 5130 LIST_FOREACH(sah, &sahtree, chain) { 5131 if (sah->state == SADB_SASTATE_DEAD) 5132 continue; 5133 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5134 continue; 5135 5136 /* get a SA with SPI. */ 5137 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5138 if (sav) 5139 break; 5140 } 5141 if (sah == NULL) { 5142 ipseclog((LOG_DEBUG, "key_delete: no SA found.\n")); 5143 return key_senderror(so, m, ENOENT); 5144 } 5145 5146 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5147 KEY_FREESAV(&sav); 5148 5149 { 5150 struct mbuf *n; 5151 struct sadb_msg *newmsg; 5152 5153 /* create new sadb_msg to reply. */ 5154 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5155 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5156 if (!n) 5157 return key_senderror(so, m, ENOBUFS); 5158 5159 if (n->m_len < sizeof(struct sadb_msg)) { 5160 n = m_pullup(n, sizeof(struct sadb_msg)); 5161 if (n == NULL) 5162 return key_senderror(so, m, ENOBUFS); 5163 } 5164 newmsg = mtod(n, struct sadb_msg *); 5165 newmsg->sadb_msg_errno = 0; 5166 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5167 5168 m_freem(m); 5169 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5170 } 5171 } 5172 5173 /* 5174 * delete all SAs for src/dst. Called from key_delete(). 5175 */ 5176 static int 5177 key_delete_all(so, m, mhp, proto) 5178 struct socket *so; 5179 struct mbuf *m; 5180 const struct sadb_msghdr *mhp; 5181 u_int16_t proto; 5182 { 5183 struct sadb_address *src0, *dst0; 5184 struct secasindex saidx; 5185 struct secashead *sah; 5186 struct secasvar *sav, *nextsav; 5187 u_int stateidx, state; 5188 5189 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5190 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5191 5192 /* XXX boundary check against sa_len */ 5193 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5194 5195 LIST_FOREACH(sah, &sahtree, chain) { 5196 if (sah->state == SADB_SASTATE_DEAD) 5197 continue; 5198 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5199 continue; 5200 5201 /* Delete all non-LARVAL SAs. */ 5202 for (stateidx = 0; 5203 stateidx < _ARRAYLEN(saorder_state_alive); 5204 stateidx++) { 5205 state = saorder_state_alive[stateidx]; 5206 if (state == SADB_SASTATE_LARVAL) 5207 continue; 5208 for (sav = LIST_FIRST(&sah->savtree[state]); 5209 sav != NULL; sav = nextsav) { 5210 nextsav = LIST_NEXT(sav, chain); 5211 /* sanity check */ 5212 if (sav->state != state) { 5213 ipseclog((LOG_DEBUG, "key_delete_all: " 5214 "invalid sav->state " 5215 "(queue: %d SA: %d)\n", 5216 state, sav->state)); 5217 continue; 5218 } 5219 5220 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5221 KEY_FREESAV(&sav); 5222 } 5223 } 5224 } 5225 { 5226 struct mbuf *n; 5227 struct sadb_msg *newmsg; 5228 5229 /* create new sadb_msg to reply. */ 5230 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5231 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5232 if (!n) 5233 return key_senderror(so, m, ENOBUFS); 5234 5235 if (n->m_len < sizeof(struct sadb_msg)) { 5236 n = m_pullup(n, sizeof(struct sadb_msg)); 5237 if (n == NULL) 5238 return key_senderror(so, m, ENOBUFS); 5239 } 5240 newmsg = mtod(n, struct sadb_msg *); 5241 newmsg->sadb_msg_errno = 0; 5242 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5243 5244 m_freem(m); 5245 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5246 } 5247 } 5248 5249 /* 5250 * SADB_GET processing 5251 * receive 5252 * <base, SA(*), address(SD)> 5253 * from the ikmpd, and get a SP and a SA to respond, 5254 * and send, 5255 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5256 * (identity(SD),) (sensitivity)> 5257 * to the ikmpd. 5258 * 5259 * m will always be freed. 5260 */ 5261 static int 5262 key_get(so, m, mhp) 5263 struct socket *so; 5264 struct mbuf *m; 5265 const struct sadb_msghdr *mhp; 5266 { 5267 struct sadb_sa *sa0; 5268 struct sadb_address *src0, *dst0; 5269 struct secasindex saidx; 5270 struct secashead *sah; 5271 struct secasvar *sav = NULL; 5272 u_int16_t proto; 5273 5274 /* sanity check */ 5275 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 5276 panic("key_get: NULL pointer is passed.\n"); 5277 5278 /* map satype to proto */ 5279 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5280 ipseclog((LOG_DEBUG, "key_get: invalid satype is passed.\n")); 5281 return key_senderror(so, m, EINVAL); 5282 } 5283 5284 if (mhp->ext[SADB_EXT_SA] == NULL || 5285 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5286 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5287 ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n")); 5288 return key_senderror(so, m, EINVAL); 5289 } 5290 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5291 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5292 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5293 ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n")); 5294 return key_senderror(so, m, EINVAL); 5295 } 5296 5297 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5298 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5299 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5300 5301 /* XXX boundary check against sa_len */ 5302 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5303 5304 /* get a SA header */ 5305 LIST_FOREACH(sah, &sahtree, chain) { 5306 if (sah->state == SADB_SASTATE_DEAD) 5307 continue; 5308 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5309 continue; 5310 5311 /* get a SA with SPI. */ 5312 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5313 if (sav) 5314 break; 5315 } 5316 if (sah == NULL) { 5317 ipseclog((LOG_DEBUG, "key_get: no SA found.\n")); 5318 return key_senderror(so, m, ENOENT); 5319 } 5320 5321 { 5322 struct mbuf *n; 5323 u_int8_t satype; 5324 5325 /* map proto to satype */ 5326 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5327 ipseclog((LOG_DEBUG, "key_get: there was invalid proto in SAD.\n")); 5328 return key_senderror(so, m, EINVAL); 5329 } 5330 5331 /* create new sadb_msg to reply. */ 5332 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5333 mhp->msg->sadb_msg_pid); 5334 if (!n) 5335 return key_senderror(so, m, ENOBUFS); 5336 5337 m_freem(m); 5338 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5339 } 5340 } 5341 5342 /* XXX make it sysctl-configurable? */ 5343 static void 5344 key_getcomb_setlifetime(comb) 5345 struct sadb_comb *comb; 5346 { 5347 5348 comb->sadb_comb_soft_allocations = 1; 5349 comb->sadb_comb_hard_allocations = 1; 5350 comb->sadb_comb_soft_bytes = 0; 5351 comb->sadb_comb_hard_bytes = 0; 5352 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5353 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5354 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5355 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5356 } 5357 5358 /* 5359 * XXX reorder combinations by preference 5360 * XXX no idea if the user wants ESP authentication or not 5361 */ 5362 static struct mbuf * 5363 key_getcomb_esp() 5364 { 5365 struct sadb_comb *comb; 5366 struct enc_xform *algo; 5367 struct mbuf *result = NULL, *m, *n; 5368 int encmin; 5369 int i, off, o; 5370 int totlen; 5371 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5372 5373 m = NULL; 5374 for (i = 1; i <= SADB_EALG_MAX; i++) { 5375 algo = esp_algorithm_lookup(i); 5376 if (algo == NULL) 5377 continue; 5378 5379 /* discard algorithms with key size smaller than system min */ 5380 if (_BITS(algo->maxkey) < ipsec_esp_keymin) 5381 continue; 5382 if (_BITS(algo->minkey) < ipsec_esp_keymin) 5383 encmin = ipsec_esp_keymin; 5384 else 5385 encmin = _BITS(algo->minkey); 5386 5387 if (ipsec_esp_auth) 5388 m = key_getcomb_ah(); 5389 else { 5390 KASSERT(l <= MLEN, 5391 ("key_getcomb_esp: l=%u > MLEN=%lu", 5392 l, (u_long) MLEN)); 5393 MGET(m, M_DONTWAIT, MT_DATA); 5394 if (m) { 5395 M_ALIGN(m, l); 5396 m->m_len = l; 5397 m->m_next = NULL; 5398 bzero(mtod(m, caddr_t), m->m_len); 5399 } 5400 } 5401 if (!m) 5402 goto fail; 5403 5404 totlen = 0; 5405 for (n = m; n; n = n->m_next) 5406 totlen += n->m_len; 5407 KASSERT((totlen % l) == 0, 5408 ("key_getcomb_esp: totlen=%u, l=%u", totlen, l)); 5409 5410 for (off = 0; off < totlen; off += l) { 5411 n = m_pulldown(m, off, l, &o); 5412 if (!n) { 5413 /* m is already freed */ 5414 goto fail; 5415 } 5416 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5417 bzero(comb, sizeof(*comb)); 5418 key_getcomb_setlifetime(comb); 5419 comb->sadb_comb_encrypt = i; 5420 comb->sadb_comb_encrypt_minbits = encmin; 5421 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5422 } 5423 5424 if (!result) 5425 result = m; 5426 else 5427 m_cat(result, m); 5428 } 5429 5430 return result; 5431 5432 fail: 5433 if (result) 5434 m_freem(result); 5435 return NULL; 5436 } 5437 5438 static void 5439 key_getsizes_ah( 5440 const struct auth_hash *ah, 5441 int alg, 5442 u_int16_t* min, 5443 u_int16_t* max) 5444 { 5445 *min = *max = ah->keysize; 5446 if (ah->keysize == 0) { 5447 /* 5448 * Transform takes arbitrary key size but algorithm 5449 * key size is restricted. Enforce this here. 5450 */ 5451 switch (alg) { 5452 case SADB_X_AALG_MD5: *min = *max = 16; break; 5453 case SADB_X_AALG_SHA: *min = *max = 20; break; 5454 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5455 default: 5456 DPRINTF(("key_getsizes_ah: unknown AH algorithm %u\n", 5457 alg)); 5458 break; 5459 } 5460 } 5461 } 5462 5463 /* 5464 * XXX reorder combinations by preference 5465 */ 5466 static struct mbuf * 5467 key_getcomb_ah() 5468 { 5469 struct sadb_comb *comb; 5470 struct auth_hash *algo; 5471 struct mbuf *m; 5472 u_int16_t minkeysize, maxkeysize; 5473 int i; 5474 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5475 5476 m = NULL; 5477 for (i = 1; i <= SADB_AALG_MAX; i++) { 5478 #if 1 5479 /* we prefer HMAC algorithms, not old algorithms */ 5480 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5481 continue; 5482 #endif 5483 algo = ah_algorithm_lookup(i); 5484 if (!algo) 5485 continue; 5486 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5487 /* discard algorithms with key size smaller than system min */ 5488 if (_BITS(minkeysize) < ipsec_ah_keymin) 5489 continue; 5490 5491 if (!m) { 5492 KASSERT(l <= MLEN, 5493 ("key_getcomb_ah: l=%u > MLEN=%lu", 5494 l, (u_long) MLEN)); 5495 MGET(m, M_DONTWAIT, MT_DATA); 5496 if (m) { 5497 M_ALIGN(m, l); 5498 m->m_len = l; 5499 m->m_next = NULL; 5500 } 5501 } else 5502 M_PREPEND(m, l, M_DONTWAIT); 5503 if (!m) 5504 return NULL; 5505 5506 comb = mtod(m, struct sadb_comb *); 5507 bzero(comb, sizeof(*comb)); 5508 key_getcomb_setlifetime(comb); 5509 comb->sadb_comb_auth = i; 5510 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5511 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5512 } 5513 5514 return m; 5515 } 5516 5517 /* 5518 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5519 * XXX reorder combinations by preference 5520 */ 5521 static struct mbuf * 5522 key_getcomb_ipcomp() 5523 { 5524 struct sadb_comb *comb; 5525 struct comp_algo *algo; 5526 struct mbuf *m; 5527 int i; 5528 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5529 5530 m = NULL; 5531 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5532 algo = ipcomp_algorithm_lookup(i); 5533 if (!algo) 5534 continue; 5535 5536 if (!m) { 5537 KASSERT(l <= MLEN, 5538 ("key_getcomb_ipcomp: l=%u > MLEN=%lu", 5539 l, (u_long) MLEN)); 5540 MGET(m, M_DONTWAIT, MT_DATA); 5541 if (m) { 5542 M_ALIGN(m, l); 5543 m->m_len = l; 5544 m->m_next = NULL; 5545 } 5546 } else 5547 M_PREPEND(m, l, M_DONTWAIT); 5548 if (!m) 5549 return NULL; 5550 5551 comb = mtod(m, struct sadb_comb *); 5552 bzero(comb, sizeof(*comb)); 5553 key_getcomb_setlifetime(comb); 5554 comb->sadb_comb_encrypt = i; 5555 /* what should we set into sadb_comb_*_{min,max}bits? */ 5556 } 5557 5558 return m; 5559 } 5560 5561 /* 5562 * XXX no way to pass mode (transport/tunnel) to userland 5563 * XXX replay checking? 5564 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5565 */ 5566 static struct mbuf * 5567 key_getprop(saidx) 5568 const struct secasindex *saidx; 5569 { 5570 struct sadb_prop *prop; 5571 struct mbuf *m, *n; 5572 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5573 int totlen; 5574 5575 switch (saidx->proto) { 5576 case IPPROTO_ESP: 5577 m = key_getcomb_esp(); 5578 break; 5579 case IPPROTO_AH: 5580 m = key_getcomb_ah(); 5581 break; 5582 case IPPROTO_IPCOMP: 5583 m = key_getcomb_ipcomp(); 5584 break; 5585 default: 5586 return NULL; 5587 } 5588 5589 if (!m) 5590 return NULL; 5591 M_PREPEND(m, l, M_DONTWAIT); 5592 if (!m) 5593 return NULL; 5594 5595 totlen = 0; 5596 for (n = m; n; n = n->m_next) 5597 totlen += n->m_len; 5598 5599 prop = mtod(m, struct sadb_prop *); 5600 bzero(prop, sizeof(*prop)); 5601 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5602 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5603 prop->sadb_prop_replay = 32; /* XXX */ 5604 5605 return m; 5606 } 5607 5608 /* 5609 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5610 * send 5611 * <base, SA, address(SD), (address(P)), x_policy, 5612 * (identity(SD),) (sensitivity,) proposal> 5613 * to KMD, and expect to receive 5614 * <base> with SADB_ACQUIRE if error occured, 5615 * or 5616 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5617 * from KMD by PF_KEY. 5618 * 5619 * XXX x_policy is outside of RFC2367 (KAME extension). 5620 * XXX sensitivity is not supported. 5621 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5622 * see comment for key_getcomb_ipcomp(). 5623 * 5624 * OUT: 5625 * 0 : succeed 5626 * others: error number 5627 */ 5628 static int 5629 key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5630 { 5631 struct mbuf *result = NULL, *m; 5632 #ifndef IPSEC_NONBLOCK_ACQUIRE 5633 struct secacq *newacq; 5634 #endif 5635 u_int8_t satype; 5636 int error = -1; 5637 u_int32_t seq; 5638 5639 /* sanity check */ 5640 KASSERT(saidx != NULL, ("key_acquire: null saidx")); 5641 satype = key_proto2satype(saidx->proto); 5642 KASSERT(satype != 0, 5643 ("key_acquire: null satype, protocol %u", saidx->proto)); 5644 5645 #ifndef IPSEC_NONBLOCK_ACQUIRE 5646 /* 5647 * We never do anything about acquirng SA. There is anather 5648 * solution that kernel blocks to send SADB_ACQUIRE message until 5649 * getting something message from IKEd. In later case, to be 5650 * managed with ACQUIRING list. 5651 */ 5652 /* Get an entry to check whether sending message or not. */ 5653 if ((newacq = key_getacq(saidx)) != NULL) { 5654 if (key_blockacq_count < newacq->count) { 5655 /* reset counter and do send message. */ 5656 newacq->count = 0; 5657 } else { 5658 /* increment counter and do nothing. */ 5659 newacq->count++; 5660 return 0; 5661 } 5662 } else { 5663 /* make new entry for blocking to send SADB_ACQUIRE. */ 5664 if ((newacq = key_newacq(saidx)) == NULL) 5665 return ENOBUFS; 5666 5667 /* add to acqtree */ 5668 LIST_INSERT_HEAD(&acqtree, newacq, chain); 5669 } 5670 #endif 5671 5672 5673 #ifndef IPSEC_NONBLOCK_ACQUIRE 5674 seq = newacq->seq; 5675 #else 5676 seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq)); 5677 #endif 5678 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5679 if (!m) { 5680 error = ENOBUFS; 5681 goto fail; 5682 } 5683 result = m; 5684 5685 /* set sadb_address for saidx's. */ 5686 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5687 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5688 if (!m) { 5689 error = ENOBUFS; 5690 goto fail; 5691 } 5692 m_cat(result, m); 5693 5694 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5695 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5696 if (!m) { 5697 error = ENOBUFS; 5698 goto fail; 5699 } 5700 m_cat(result, m); 5701 5702 /* XXX proxy address (optional) */ 5703 5704 /* set sadb_x_policy */ 5705 if (sp) { 5706 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5707 if (!m) { 5708 error = ENOBUFS; 5709 goto fail; 5710 } 5711 m_cat(result, m); 5712 } 5713 5714 /* XXX identity (optional) */ 5715 #if 0 5716 if (idexttype && fqdn) { 5717 /* create identity extension (FQDN) */ 5718 struct sadb_ident *id; 5719 int fqdnlen; 5720 5721 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5722 id = (struct sadb_ident *)p; 5723 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5724 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5725 id->sadb_ident_exttype = idexttype; 5726 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5727 bcopy(fqdn, id + 1, fqdnlen); 5728 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5729 } 5730 5731 if (idexttype) { 5732 /* create identity extension (USERFQDN) */ 5733 struct sadb_ident *id; 5734 int userfqdnlen; 5735 5736 if (userfqdn) { 5737 /* +1 for terminating-NUL */ 5738 userfqdnlen = strlen(userfqdn) + 1; 5739 } else 5740 userfqdnlen = 0; 5741 id = (struct sadb_ident *)p; 5742 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5743 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5744 id->sadb_ident_exttype = idexttype; 5745 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5746 /* XXX is it correct? */ 5747 if (curproc && curproc->p_cred) 5748 id->sadb_ident_id = curproc->p_cred->p_ruid; 5749 if (userfqdn && userfqdnlen) 5750 bcopy(userfqdn, id + 1, userfqdnlen); 5751 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5752 } 5753 #endif 5754 5755 /* XXX sensitivity (optional) */ 5756 5757 /* create proposal/combination extension */ 5758 m = key_getprop(saidx); 5759 #if 0 5760 /* 5761 * spec conformant: always attach proposal/combination extension, 5762 * the problem is that we have no way to attach it for ipcomp, 5763 * due to the way sadb_comb is declared in RFC2367. 5764 */ 5765 if (!m) { 5766 error = ENOBUFS; 5767 goto fail; 5768 } 5769 m_cat(result, m); 5770 #else 5771 /* 5772 * outside of spec; make proposal/combination extension optional. 5773 */ 5774 if (m) 5775 m_cat(result, m); 5776 #endif 5777 5778 if ((result->m_flags & M_PKTHDR) == 0) { 5779 error = EINVAL; 5780 goto fail; 5781 } 5782 5783 if (result->m_len < sizeof(struct sadb_msg)) { 5784 result = m_pullup(result, sizeof(struct sadb_msg)); 5785 if (result == NULL) { 5786 error = ENOBUFS; 5787 goto fail; 5788 } 5789 } 5790 5791 result->m_pkthdr.len = 0; 5792 for (m = result; m; m = m->m_next) 5793 result->m_pkthdr.len += m->m_len; 5794 5795 mtod(result, struct sadb_msg *)->sadb_msg_len = 5796 PFKEY_UNIT64(result->m_pkthdr.len); 5797 5798 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5799 5800 fail: 5801 if (result) 5802 m_freem(result); 5803 return error; 5804 } 5805 5806 #ifndef IPSEC_NONBLOCK_ACQUIRE 5807 static struct secacq * 5808 key_newacq(const struct secasindex *saidx) 5809 { 5810 struct secacq *newacq; 5811 5812 /* get new entry */ 5813 KMALLOC(newacq, struct secacq *, sizeof(struct secacq)); 5814 if (newacq == NULL) { 5815 ipseclog((LOG_DEBUG, "key_newacq: No more memory.\n")); 5816 return NULL; 5817 } 5818 bzero(newacq, sizeof(*newacq)); 5819 5820 /* copy secindex */ 5821 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5822 newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq); 5823 newacq->created = time_second; 5824 newacq->count = 0; 5825 5826 return newacq; 5827 } 5828 5829 static struct secacq * 5830 key_getacq(const struct secasindex *saidx) 5831 { 5832 struct secacq *acq; 5833 5834 LIST_FOREACH(acq, &acqtree, chain) { 5835 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5836 return acq; 5837 } 5838 5839 return NULL; 5840 } 5841 5842 static struct secacq * 5843 key_getacqbyseq(seq) 5844 u_int32_t seq; 5845 { 5846 struct secacq *acq; 5847 5848 LIST_FOREACH(acq, &acqtree, chain) { 5849 if (acq->seq == seq) 5850 return acq; 5851 } 5852 5853 return NULL; 5854 } 5855 #endif 5856 5857 static struct secspacq * 5858 key_newspacq(spidx) 5859 struct secpolicyindex *spidx; 5860 { 5861 struct secspacq *acq; 5862 5863 /* get new entry */ 5864 KMALLOC(acq, struct secspacq *, sizeof(struct secspacq)); 5865 if (acq == NULL) { 5866 ipseclog((LOG_DEBUG, "key_newspacq: No more memory.\n")); 5867 return NULL; 5868 } 5869 bzero(acq, sizeof(*acq)); 5870 5871 /* copy secindex */ 5872 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5873 acq->created = time_second; 5874 acq->count = 0; 5875 5876 return acq; 5877 } 5878 5879 static struct secspacq * 5880 key_getspacq(spidx) 5881 struct secpolicyindex *spidx; 5882 { 5883 struct secspacq *acq; 5884 5885 LIST_FOREACH(acq, &spacqtree, chain) { 5886 if (key_cmpspidx_exactly(spidx, &acq->spidx)) 5887 return acq; 5888 } 5889 5890 return NULL; 5891 } 5892 5893 /* 5894 * SADB_ACQUIRE processing, 5895 * in first situation, is receiving 5896 * <base> 5897 * from the ikmpd, and clear sequence of its secasvar entry. 5898 * 5899 * In second situation, is receiving 5900 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5901 * from a user land process, and return 5902 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5903 * to the socket. 5904 * 5905 * m will always be freed. 5906 */ 5907 static int 5908 key_acquire2(so, m, mhp) 5909 struct socket *so; 5910 struct mbuf *m; 5911 const struct sadb_msghdr *mhp; 5912 { 5913 const struct sadb_address *src0, *dst0; 5914 struct secasindex saidx; 5915 struct secashead *sah; 5916 u_int16_t proto; 5917 int error; 5918 5919 /* sanity check */ 5920 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 5921 panic("key_acquire2: NULL pointer is passed.\n"); 5922 5923 /* 5924 * Error message from KMd. 5925 * We assume that if error was occured in IKEd, the length of PFKEY 5926 * message is equal to the size of sadb_msg structure. 5927 * We do not raise error even if error occured in this function. 5928 */ 5929 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 5930 #ifndef IPSEC_NONBLOCK_ACQUIRE 5931 struct secacq *acq; 5932 5933 /* check sequence number */ 5934 if (mhp->msg->sadb_msg_seq == 0) { 5935 ipseclog((LOG_DEBUG, "key_acquire2: must specify sequence number.\n")); 5936 m_freem(m); 5937 return 0; 5938 } 5939 5940 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 5941 /* 5942 * the specified larval SA is already gone, or we got 5943 * a bogus sequence number. we can silently ignore it. 5944 */ 5945 m_freem(m); 5946 return 0; 5947 } 5948 5949 /* reset acq counter in order to deletion by timehander. */ 5950 acq->created = time_second; 5951 acq->count = 0; 5952 #endif 5953 m_freem(m); 5954 return 0; 5955 } 5956 5957 /* 5958 * This message is from user land. 5959 */ 5960 5961 /* map satype to proto */ 5962 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5963 ipseclog((LOG_DEBUG, "key_acquire2: invalid satype is passed.\n")); 5964 return key_senderror(so, m, EINVAL); 5965 } 5966 5967 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5968 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5969 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 5970 /* error */ 5971 ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n")); 5972 return key_senderror(so, m, EINVAL); 5973 } 5974 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5975 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 5976 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 5977 /* error */ 5978 ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n")); 5979 return key_senderror(so, m, EINVAL); 5980 } 5981 5982 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5983 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5984 5985 /* XXX boundary check against sa_len */ 5986 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5987 5988 /* get a SA index */ 5989 LIST_FOREACH(sah, &sahtree, chain) { 5990 if (sah->state == SADB_SASTATE_DEAD) 5991 continue; 5992 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 5993 break; 5994 } 5995 if (sah != NULL) { 5996 ipseclog((LOG_DEBUG, "key_acquire2: a SA exists already.\n")); 5997 return key_senderror(so, m, EEXIST); 5998 } 5999 6000 error = key_acquire(&saidx, NULL); 6001 if (error != 0) { 6002 ipseclog((LOG_DEBUG, "key_acquire2: error %d returned " 6003 "from key_acquire.\n", mhp->msg->sadb_msg_errno)); 6004 return key_senderror(so, m, error); 6005 } 6006 6007 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6008 } 6009 6010 /* 6011 * SADB_REGISTER processing. 6012 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6013 * receive 6014 * <base> 6015 * from the ikmpd, and register a socket to send PF_KEY messages, 6016 * and send 6017 * <base, supported> 6018 * to KMD by PF_KEY. 6019 * If socket is detached, must free from regnode. 6020 * 6021 * m will always be freed. 6022 */ 6023 static int 6024 key_register(so, m, mhp) 6025 struct socket *so; 6026 struct mbuf *m; 6027 const struct sadb_msghdr *mhp; 6028 { 6029 struct secreg *reg, *newreg = 0; 6030 6031 /* sanity check */ 6032 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 6033 panic("key_register: NULL pointer is passed.\n"); 6034 6035 /* check for invalid register message */ 6036 if (mhp->msg->sadb_msg_satype >= sizeof(regtree)/sizeof(regtree[0])) 6037 return key_senderror(so, m, EINVAL); 6038 6039 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6040 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6041 goto setmsg; 6042 6043 /* check whether existing or not */ 6044 LIST_FOREACH(reg, ®tree[mhp->msg->sadb_msg_satype], chain) { 6045 if (reg->so == so) { 6046 ipseclog((LOG_DEBUG, "key_register: socket exists already.\n")); 6047 return key_senderror(so, m, EEXIST); 6048 } 6049 } 6050 6051 /* create regnode */ 6052 KMALLOC(newreg, struct secreg *, sizeof(*newreg)); 6053 if (newreg == NULL) { 6054 ipseclog((LOG_DEBUG, "key_register: No more memory.\n")); 6055 return key_senderror(so, m, ENOBUFS); 6056 } 6057 bzero((caddr_t)newreg, sizeof(*newreg)); 6058 6059 newreg->so = so; 6060 ((struct keycb *)sotorawcb(so))->kp_registered++; 6061 6062 /* add regnode to regtree. */ 6063 LIST_INSERT_HEAD(®tree[mhp->msg->sadb_msg_satype], newreg, chain); 6064 6065 setmsg: 6066 { 6067 struct mbuf *n; 6068 struct sadb_msg *newmsg; 6069 struct sadb_supported *sup; 6070 u_int len, alen, elen; 6071 int off; 6072 int i; 6073 struct sadb_alg *alg; 6074 6075 /* create new sadb_msg to reply. */ 6076 alen = 0; 6077 for (i = 1; i <= SADB_AALG_MAX; i++) { 6078 if (ah_algorithm_lookup(i)) 6079 alen += sizeof(struct sadb_alg); 6080 } 6081 if (alen) 6082 alen += sizeof(struct sadb_supported); 6083 elen = 0; 6084 for (i = 1; i <= SADB_EALG_MAX; i++) { 6085 if (esp_algorithm_lookup(i)) 6086 elen += sizeof(struct sadb_alg); 6087 } 6088 if (elen) 6089 elen += sizeof(struct sadb_supported); 6090 6091 len = sizeof(struct sadb_msg) + alen + elen; 6092 6093 if (len > MCLBYTES) 6094 return key_senderror(so, m, ENOBUFS); 6095 6096 MGETHDR(n, M_DONTWAIT, MT_DATA); 6097 if (len > MHLEN) { 6098 MCLGET(n, M_DONTWAIT); 6099 if ((n->m_flags & M_EXT) == 0) { 6100 m_freem(n); 6101 n = NULL; 6102 } 6103 } 6104 if (!n) 6105 return key_senderror(so, m, ENOBUFS); 6106 6107 n->m_pkthdr.len = n->m_len = len; 6108 n->m_next = NULL; 6109 off = 0; 6110 6111 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6112 newmsg = mtod(n, struct sadb_msg *); 6113 newmsg->sadb_msg_errno = 0; 6114 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6115 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6116 6117 /* for authentication algorithm */ 6118 if (alen) { 6119 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6120 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6121 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6122 off += PFKEY_ALIGN8(sizeof(*sup)); 6123 6124 for (i = 1; i <= SADB_AALG_MAX; i++) { 6125 struct auth_hash *aalgo; 6126 u_int16_t minkeysize, maxkeysize; 6127 6128 aalgo = ah_algorithm_lookup(i); 6129 if (!aalgo) 6130 continue; 6131 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6132 alg->sadb_alg_id = i; 6133 alg->sadb_alg_ivlen = 0; 6134 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6135 alg->sadb_alg_minbits = _BITS(minkeysize); 6136 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6137 off += PFKEY_ALIGN8(sizeof(*alg)); 6138 } 6139 } 6140 6141 /* for encryption algorithm */ 6142 if (elen) { 6143 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6144 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6145 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6146 off += PFKEY_ALIGN8(sizeof(*sup)); 6147 6148 for (i = 1; i <= SADB_EALG_MAX; i++) { 6149 struct enc_xform *ealgo; 6150 6151 ealgo = esp_algorithm_lookup(i); 6152 if (!ealgo) 6153 continue; 6154 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6155 alg->sadb_alg_id = i; 6156 alg->sadb_alg_ivlen = ealgo->blocksize; 6157 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6158 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6159 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6160 } 6161 } 6162 6163 #ifdef DIGAGNOSTIC 6164 if (off != len) 6165 panic("length assumption failed in key_register"); 6166 #endif 6167 6168 m_freem(m); 6169 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6170 } 6171 } 6172 6173 /* 6174 * free secreg entry registered. 6175 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6176 */ 6177 void 6178 key_freereg(so) 6179 struct socket *so; 6180 { 6181 struct secreg *reg; 6182 int i; 6183 6184 /* sanity check */ 6185 if (so == NULL) 6186 panic("key_freereg: NULL pointer is passed.\n"); 6187 6188 /* 6189 * check whether existing or not. 6190 * check all type of SA, because there is a potential that 6191 * one socket is registered to multiple type of SA. 6192 */ 6193 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6194 LIST_FOREACH(reg, ®tree[i], chain) { 6195 if (reg->so == so 6196 && __LIST_CHAINED(reg)) { 6197 LIST_REMOVE(reg, chain); 6198 KFREE(reg); 6199 break; 6200 } 6201 } 6202 } 6203 6204 return; 6205 } 6206 6207 /* 6208 * SADB_EXPIRE processing 6209 * send 6210 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6211 * to KMD by PF_KEY. 6212 * NOTE: We send only soft lifetime extension. 6213 * 6214 * OUT: 0 : succeed 6215 * others : error number 6216 */ 6217 static int 6218 key_expire(sav) 6219 struct secasvar *sav; 6220 { 6221 int s; 6222 int satype; 6223 struct mbuf *result = NULL, *m; 6224 int len; 6225 int error = -1; 6226 struct sadb_lifetime *lt; 6227 6228 /* XXX: Why do we lock ? */ 6229 s = splnet(); /*called from softclock()*/ 6230 6231 /* sanity check */ 6232 if (sav == NULL) 6233 panic("key_expire: NULL pointer is passed.\n"); 6234 if (sav->sah == NULL) 6235 panic("key_expire: Why was SA index in SA NULL.\n"); 6236 if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0) 6237 panic("key_expire: invalid proto is passed.\n"); 6238 6239 /* set msg header */ 6240 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6241 if (!m) { 6242 error = ENOBUFS; 6243 goto fail; 6244 } 6245 result = m; 6246 6247 /* create SA extension */ 6248 m = key_setsadbsa(sav); 6249 if (!m) { 6250 error = ENOBUFS; 6251 goto fail; 6252 } 6253 m_cat(result, m); 6254 6255 /* create SA extension */ 6256 m = key_setsadbxsa2(sav->sah->saidx.mode, 6257 sav->replay ? sav->replay->count : 0, 6258 sav->sah->saidx.reqid); 6259 if (!m) { 6260 error = ENOBUFS; 6261 goto fail; 6262 } 6263 m_cat(result, m); 6264 6265 /* create lifetime extension (current and soft) */ 6266 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6267 m = key_alloc_mbuf(len); 6268 if (!m || m->m_next) { /*XXX*/ 6269 if (m) 6270 m_freem(m); 6271 error = ENOBUFS; 6272 goto fail; 6273 } 6274 bzero(mtod(m, caddr_t), len); 6275 lt = mtod(m, struct sadb_lifetime *); 6276 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6277 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6278 lt->sadb_lifetime_allocations = sav->lft_c->sadb_lifetime_allocations; 6279 lt->sadb_lifetime_bytes = sav->lft_c->sadb_lifetime_bytes; 6280 lt->sadb_lifetime_addtime = sav->lft_c->sadb_lifetime_addtime; 6281 lt->sadb_lifetime_usetime = sav->lft_c->sadb_lifetime_usetime; 6282 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6283 bcopy(sav->lft_s, lt, sizeof(*lt)); 6284 m_cat(result, m); 6285 6286 /* set sadb_address for source */ 6287 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6288 &sav->sah->saidx.src.sa, 6289 FULLMASK, IPSEC_ULPROTO_ANY); 6290 if (!m) { 6291 error = ENOBUFS; 6292 goto fail; 6293 } 6294 m_cat(result, m); 6295 6296 /* set sadb_address for destination */ 6297 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6298 &sav->sah->saidx.dst.sa, 6299 FULLMASK, IPSEC_ULPROTO_ANY); 6300 if (!m) { 6301 error = ENOBUFS; 6302 goto fail; 6303 } 6304 m_cat(result, m); 6305 6306 if ((result->m_flags & M_PKTHDR) == 0) { 6307 error = EINVAL; 6308 goto fail; 6309 } 6310 6311 if (result->m_len < sizeof(struct sadb_msg)) { 6312 result = m_pullup(result, sizeof(struct sadb_msg)); 6313 if (result == NULL) { 6314 error = ENOBUFS; 6315 goto fail; 6316 } 6317 } 6318 6319 result->m_pkthdr.len = 0; 6320 for (m = result; m; m = m->m_next) 6321 result->m_pkthdr.len += m->m_len; 6322 6323 mtod(result, struct sadb_msg *)->sadb_msg_len = 6324 PFKEY_UNIT64(result->m_pkthdr.len); 6325 6326 splx(s); 6327 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6328 6329 fail: 6330 if (result) 6331 m_freem(result); 6332 splx(s); 6333 return error; 6334 } 6335 6336 /* 6337 * SADB_FLUSH processing 6338 * receive 6339 * <base> 6340 * from the ikmpd, and free all entries in secastree. 6341 * and send, 6342 * <base> 6343 * to the ikmpd. 6344 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6345 * 6346 * m will always be freed. 6347 */ 6348 static int 6349 key_flush(so, m, mhp) 6350 struct socket *so; 6351 struct mbuf *m; 6352 const struct sadb_msghdr *mhp; 6353 { 6354 struct sadb_msg *newmsg; 6355 struct secashead *sah, *nextsah; 6356 struct secasvar *sav, *nextsav; 6357 u_int16_t proto; 6358 u_int8_t state; 6359 u_int stateidx; 6360 6361 /* sanity check */ 6362 if (so == NULL || mhp == NULL || mhp->msg == NULL) 6363 panic("key_flush: NULL pointer is passed.\n"); 6364 6365 /* map satype to proto */ 6366 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6367 ipseclog((LOG_DEBUG, "key_flush: invalid satype is passed.\n")); 6368 return key_senderror(so, m, EINVAL); 6369 } 6370 6371 /* no SATYPE specified, i.e. flushing all SA. */ 6372 for (sah = LIST_FIRST(&sahtree); 6373 sah != NULL; 6374 sah = nextsah) { 6375 nextsah = LIST_NEXT(sah, chain); 6376 6377 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6378 && proto != sah->saidx.proto) 6379 continue; 6380 6381 for (stateidx = 0; 6382 stateidx < _ARRAYLEN(saorder_state_alive); 6383 stateidx++) { 6384 state = saorder_state_any[stateidx]; 6385 for (sav = LIST_FIRST(&sah->savtree[state]); 6386 sav != NULL; 6387 sav = nextsav) { 6388 6389 nextsav = LIST_NEXT(sav, chain); 6390 6391 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6392 KEY_FREESAV(&sav); 6393 } 6394 } 6395 6396 sah->state = SADB_SASTATE_DEAD; 6397 } 6398 6399 if (m->m_len < sizeof(struct sadb_msg) || 6400 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6401 ipseclog((LOG_DEBUG, "key_flush: No more memory.\n")); 6402 return key_senderror(so, m, ENOBUFS); 6403 } 6404 6405 if (m->m_next) 6406 m_freem(m->m_next); 6407 m->m_next = NULL; 6408 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6409 newmsg = mtod(m, struct sadb_msg *); 6410 newmsg->sadb_msg_errno = 0; 6411 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6412 6413 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6414 } 6415 6416 /* 6417 * SADB_DUMP processing 6418 * dump all entries including status of DEAD in SAD. 6419 * receive 6420 * <base> 6421 * from the ikmpd, and dump all secasvar leaves 6422 * and send, 6423 * <base> ..... 6424 * to the ikmpd. 6425 * 6426 * m will always be freed. 6427 */ 6428 static int 6429 key_dump(so, m, mhp) 6430 struct socket *so; 6431 struct mbuf *m; 6432 const struct sadb_msghdr *mhp; 6433 { 6434 struct secashead *sah; 6435 struct secasvar *sav; 6436 u_int16_t proto; 6437 u_int stateidx; 6438 u_int8_t satype; 6439 u_int8_t state; 6440 int cnt; 6441 struct sadb_msg *newmsg; 6442 struct mbuf *n; 6443 6444 /* sanity check */ 6445 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 6446 panic("key_dump: NULL pointer is passed.\n"); 6447 6448 /* map satype to proto */ 6449 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6450 ipseclog((LOG_DEBUG, "key_dump: invalid satype is passed.\n")); 6451 return key_senderror(so, m, EINVAL); 6452 } 6453 6454 /* count sav entries to be sent to the userland. */ 6455 cnt = 0; 6456 LIST_FOREACH(sah, &sahtree, chain) { 6457 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6458 && proto != sah->saidx.proto) 6459 continue; 6460 6461 for (stateidx = 0; 6462 stateidx < _ARRAYLEN(saorder_state_any); 6463 stateidx++) { 6464 state = saorder_state_any[stateidx]; 6465 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6466 cnt++; 6467 } 6468 } 6469 } 6470 6471 if (cnt == 0) 6472 return key_senderror(so, m, ENOENT); 6473 6474 /* send this to the userland, one at a time. */ 6475 newmsg = NULL; 6476 LIST_FOREACH(sah, &sahtree, chain) { 6477 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6478 && proto != sah->saidx.proto) 6479 continue; 6480 6481 /* map proto to satype */ 6482 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6483 ipseclog((LOG_DEBUG, "key_dump: there was invalid proto in SAD.\n")); 6484 return key_senderror(so, m, EINVAL); 6485 } 6486 6487 for (stateidx = 0; 6488 stateidx < _ARRAYLEN(saorder_state_any); 6489 stateidx++) { 6490 state = saorder_state_any[stateidx]; 6491 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6492 n = key_setdumpsa(sav, SADB_DUMP, satype, 6493 --cnt, mhp->msg->sadb_msg_pid); 6494 if (!n) 6495 return key_senderror(so, m, ENOBUFS); 6496 6497 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6498 } 6499 } 6500 } 6501 6502 m_freem(m); 6503 return 0; 6504 } 6505 6506 /* 6507 * SADB_X_PROMISC processing 6508 * 6509 * m will always be freed. 6510 */ 6511 static int 6512 key_promisc(so, m, mhp) 6513 struct socket *so; 6514 struct mbuf *m; 6515 const struct sadb_msghdr *mhp; 6516 { 6517 int olen; 6518 6519 /* sanity check */ 6520 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) 6521 panic("key_promisc: NULL pointer is passed.\n"); 6522 6523 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6524 6525 if (olen < sizeof(struct sadb_msg)) { 6526 #if 1 6527 return key_senderror(so, m, EINVAL); 6528 #else 6529 m_freem(m); 6530 return 0; 6531 #endif 6532 } else if (olen == sizeof(struct sadb_msg)) { 6533 /* enable/disable promisc mode */ 6534 struct keycb *kp; 6535 6536 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6537 return key_senderror(so, m, EINVAL); 6538 mhp->msg->sadb_msg_errno = 0; 6539 switch (mhp->msg->sadb_msg_satype) { 6540 case 0: 6541 case 1: 6542 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6543 break; 6544 default: 6545 return key_senderror(so, m, EINVAL); 6546 } 6547 6548 /* send the original message back to everyone */ 6549 mhp->msg->sadb_msg_errno = 0; 6550 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6551 } else { 6552 /* send packet as is */ 6553 6554 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6555 6556 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6557 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6558 } 6559 } 6560 6561 static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6562 const struct sadb_msghdr *)) = { 6563 NULL, /* SADB_RESERVED */ 6564 key_getspi, /* SADB_GETSPI */ 6565 key_update, /* SADB_UPDATE */ 6566 key_add, /* SADB_ADD */ 6567 key_delete, /* SADB_DELETE */ 6568 key_get, /* SADB_GET */ 6569 key_acquire2, /* SADB_ACQUIRE */ 6570 key_register, /* SADB_REGISTER */ 6571 NULL, /* SADB_EXPIRE */ 6572 key_flush, /* SADB_FLUSH */ 6573 key_dump, /* SADB_DUMP */ 6574 key_promisc, /* SADB_X_PROMISC */ 6575 NULL, /* SADB_X_PCHANGE */ 6576 key_spdadd, /* SADB_X_SPDUPDATE */ 6577 key_spdadd, /* SADB_X_SPDADD */ 6578 key_spddelete, /* SADB_X_SPDDELETE */ 6579 key_spdget, /* SADB_X_SPDGET */ 6580 NULL, /* SADB_X_SPDACQUIRE */ 6581 key_spddump, /* SADB_X_SPDDUMP */ 6582 key_spdflush, /* SADB_X_SPDFLUSH */ 6583 key_spdadd, /* SADB_X_SPDSETIDX */ 6584 NULL, /* SADB_X_SPDEXPIRE */ 6585 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6586 }; 6587 6588 /* 6589 * parse sadb_msg buffer to process PFKEYv2, 6590 * and create a data to response if needed. 6591 * I think to be dealed with mbuf directly. 6592 * IN: 6593 * msgp : pointer to pointer to a received buffer pulluped. 6594 * This is rewrited to response. 6595 * so : pointer to socket. 6596 * OUT: 6597 * length for buffer to send to user process. 6598 */ 6599 int 6600 key_parse(m, so) 6601 struct mbuf *m; 6602 struct socket *so; 6603 { 6604 struct sadb_msg *msg; 6605 struct sadb_msghdr mh; 6606 u_int orglen; 6607 int error; 6608 int target; 6609 6610 /* sanity check */ 6611 if (m == NULL || so == NULL) 6612 panic("key_parse: NULL pointer is passed.\n"); 6613 6614 #if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6615 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6616 ipseclog((LOG_DEBUG, "key_parse: passed sadb_msg\n")); 6617 kdebug_sadb(msg)); 6618 #endif 6619 6620 if (m->m_len < sizeof(struct sadb_msg)) { 6621 m = m_pullup(m, sizeof(struct sadb_msg)); 6622 if (!m) 6623 return ENOBUFS; 6624 } 6625 msg = mtod(m, struct sadb_msg *); 6626 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6627 target = KEY_SENDUP_ONE; 6628 6629 if ((m->m_flags & M_PKTHDR) == 0 || 6630 m->m_pkthdr.len != m->m_pkthdr.len) { 6631 ipseclog((LOG_DEBUG, "key_parse: invalid message length.\n")); 6632 pfkeystat.out_invlen++; 6633 error = EINVAL; 6634 goto senderror; 6635 } 6636 6637 if (msg->sadb_msg_version != PF_KEY_V2) { 6638 ipseclog((LOG_DEBUG, 6639 "key_parse: PF_KEY version %u is mismatched.\n", 6640 msg->sadb_msg_version)); 6641 pfkeystat.out_invver++; 6642 error = EINVAL; 6643 goto senderror; 6644 } 6645 6646 if (msg->sadb_msg_type > SADB_MAX) { 6647 ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n", 6648 msg->sadb_msg_type)); 6649 pfkeystat.out_invmsgtype++; 6650 error = EINVAL; 6651 goto senderror; 6652 } 6653 6654 /* for old-fashioned code - should be nuked */ 6655 if (m->m_pkthdr.len > MCLBYTES) { 6656 m_freem(m); 6657 return ENOBUFS; 6658 } 6659 if (m->m_next) { 6660 struct mbuf *n; 6661 6662 MGETHDR(n, M_DONTWAIT, MT_DATA); 6663 if (n && m->m_pkthdr.len > MHLEN) { 6664 MCLGET(n, M_DONTWAIT); 6665 if ((n->m_flags & M_EXT) == 0) { 6666 m_free(n); 6667 n = NULL; 6668 } 6669 } 6670 if (!n) { 6671 m_freem(m); 6672 return ENOBUFS; 6673 } 6674 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6675 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6676 n->m_next = NULL; 6677 m_freem(m); 6678 m = n; 6679 } 6680 6681 /* align the mbuf chain so that extensions are in contiguous region. */ 6682 error = key_align(m, &mh); 6683 if (error) 6684 return error; 6685 6686 if (m->m_next) { /*XXX*/ 6687 m_freem(m); 6688 return ENOBUFS; 6689 } 6690 6691 msg = mh.msg; 6692 6693 /* check SA type */ 6694 switch (msg->sadb_msg_satype) { 6695 case SADB_SATYPE_UNSPEC: 6696 switch (msg->sadb_msg_type) { 6697 case SADB_GETSPI: 6698 case SADB_UPDATE: 6699 case SADB_ADD: 6700 case SADB_DELETE: 6701 case SADB_GET: 6702 case SADB_ACQUIRE: 6703 case SADB_EXPIRE: 6704 ipseclog((LOG_DEBUG, "key_parse: must specify satype " 6705 "when msg type=%u.\n", msg->sadb_msg_type)); 6706 pfkeystat.out_invsatype++; 6707 error = EINVAL; 6708 goto senderror; 6709 } 6710 break; 6711 case SADB_SATYPE_AH: 6712 case SADB_SATYPE_ESP: 6713 case SADB_X_SATYPE_IPCOMP: 6714 switch (msg->sadb_msg_type) { 6715 case SADB_X_SPDADD: 6716 case SADB_X_SPDDELETE: 6717 case SADB_X_SPDGET: 6718 case SADB_X_SPDDUMP: 6719 case SADB_X_SPDFLUSH: 6720 case SADB_X_SPDSETIDX: 6721 case SADB_X_SPDUPDATE: 6722 case SADB_X_SPDDELETE2: 6723 ipseclog((LOG_DEBUG, "key_parse: illegal satype=%u\n", 6724 msg->sadb_msg_type)); 6725 pfkeystat.out_invsatype++; 6726 error = EINVAL; 6727 goto senderror; 6728 } 6729 break; 6730 case SADB_SATYPE_RSVP: 6731 case SADB_SATYPE_OSPFV2: 6732 case SADB_SATYPE_RIPV2: 6733 case SADB_SATYPE_MIP: 6734 ipseclog((LOG_DEBUG, "key_parse: type %u isn't supported.\n", 6735 msg->sadb_msg_satype)); 6736 pfkeystat.out_invsatype++; 6737 error = EOPNOTSUPP; 6738 goto senderror; 6739 case 1: /* XXX: What does it do? */ 6740 if (msg->sadb_msg_type == SADB_X_PROMISC) 6741 break; 6742 /*FALLTHROUGH*/ 6743 default: 6744 ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n", 6745 msg->sadb_msg_satype)); 6746 pfkeystat.out_invsatype++; 6747 error = EINVAL; 6748 goto senderror; 6749 } 6750 6751 /* check field of upper layer protocol and address family */ 6752 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6753 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6754 struct sadb_address *src0, *dst0; 6755 u_int plen; 6756 6757 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6758 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6759 6760 /* check upper layer protocol */ 6761 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6762 ipseclog((LOG_DEBUG, "key_parse: upper layer protocol mismatched.\n")); 6763 pfkeystat.out_invaddr++; 6764 error = EINVAL; 6765 goto senderror; 6766 } 6767 6768 /* check family */ 6769 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6770 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6771 ipseclog((LOG_DEBUG, "key_parse: address family mismatched.\n")); 6772 pfkeystat.out_invaddr++; 6773 error = EINVAL; 6774 goto senderror; 6775 } 6776 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6777 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6778 ipseclog((LOG_DEBUG, 6779 "key_parse: address struct size mismatched.\n")); 6780 pfkeystat.out_invaddr++; 6781 error = EINVAL; 6782 goto senderror; 6783 } 6784 6785 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6786 case AF_INET: 6787 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6788 sizeof(struct sockaddr_in)) { 6789 pfkeystat.out_invaddr++; 6790 error = EINVAL; 6791 goto senderror; 6792 } 6793 break; 6794 case AF_INET6: 6795 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6796 sizeof(struct sockaddr_in6)) { 6797 pfkeystat.out_invaddr++; 6798 error = EINVAL; 6799 goto senderror; 6800 } 6801 break; 6802 default: 6803 ipseclog((LOG_DEBUG, 6804 "key_parse: unsupported address family.\n")); 6805 pfkeystat.out_invaddr++; 6806 error = EAFNOSUPPORT; 6807 goto senderror; 6808 } 6809 6810 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6811 case AF_INET: 6812 plen = sizeof(struct in_addr) << 3; 6813 break; 6814 case AF_INET6: 6815 plen = sizeof(struct in6_addr) << 3; 6816 break; 6817 default: 6818 plen = 0; /*fool gcc*/ 6819 break; 6820 } 6821 6822 /* check max prefix length */ 6823 if (src0->sadb_address_prefixlen > plen || 6824 dst0->sadb_address_prefixlen > plen) { 6825 ipseclog((LOG_DEBUG, 6826 "key_parse: illegal prefixlen.\n")); 6827 pfkeystat.out_invaddr++; 6828 error = EINVAL; 6829 goto senderror; 6830 } 6831 6832 /* 6833 * prefixlen == 0 is valid because there can be a case when 6834 * all addresses are matched. 6835 */ 6836 } 6837 6838 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6839 key_typesw[msg->sadb_msg_type] == NULL) { 6840 pfkeystat.out_invmsgtype++; 6841 error = EINVAL; 6842 goto senderror; 6843 } 6844 6845 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6846 6847 senderror: 6848 msg->sadb_msg_errno = error; 6849 return key_sendup_mbuf(so, m, target); 6850 } 6851 6852 static int 6853 key_senderror(so, m, code) 6854 struct socket *so; 6855 struct mbuf *m; 6856 int code; 6857 { 6858 struct sadb_msg *msg; 6859 6860 if (m->m_len < sizeof(struct sadb_msg)) 6861 panic("invalid mbuf passed to key_senderror"); 6862 6863 msg = mtod(m, struct sadb_msg *); 6864 msg->sadb_msg_errno = code; 6865 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 6866 } 6867 6868 /* 6869 * set the pointer to each header into message buffer. 6870 * m will be freed on error. 6871 * XXX larger-than-MCLBYTES extension? 6872 */ 6873 static int 6874 key_align(m, mhp) 6875 struct mbuf *m; 6876 struct sadb_msghdr *mhp; 6877 { 6878 struct mbuf *n; 6879 struct sadb_ext *ext; 6880 size_t off, end; 6881 int extlen; 6882 int toff; 6883 6884 /* sanity check */ 6885 if (m == NULL || mhp == NULL) 6886 panic("key_align: NULL pointer is passed.\n"); 6887 if (m->m_len < sizeof(struct sadb_msg)) 6888 panic("invalid mbuf passed to key_align"); 6889 6890 /* initialize */ 6891 bzero(mhp, sizeof(*mhp)); 6892 6893 mhp->msg = mtod(m, struct sadb_msg *); 6894 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 6895 6896 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6897 extlen = end; /*just in case extlen is not updated*/ 6898 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 6899 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 6900 if (!n) { 6901 /* m is already freed */ 6902 return ENOBUFS; 6903 } 6904 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 6905 6906 /* set pointer */ 6907 switch (ext->sadb_ext_type) { 6908 case SADB_EXT_SA: 6909 case SADB_EXT_ADDRESS_SRC: 6910 case SADB_EXT_ADDRESS_DST: 6911 case SADB_EXT_ADDRESS_PROXY: 6912 case SADB_EXT_LIFETIME_CURRENT: 6913 case SADB_EXT_LIFETIME_HARD: 6914 case SADB_EXT_LIFETIME_SOFT: 6915 case SADB_EXT_KEY_AUTH: 6916 case SADB_EXT_KEY_ENCRYPT: 6917 case SADB_EXT_IDENTITY_SRC: 6918 case SADB_EXT_IDENTITY_DST: 6919 case SADB_EXT_SENSITIVITY: 6920 case SADB_EXT_PROPOSAL: 6921 case SADB_EXT_SUPPORTED_AUTH: 6922 case SADB_EXT_SUPPORTED_ENCRYPT: 6923 case SADB_EXT_SPIRANGE: 6924 case SADB_X_EXT_POLICY: 6925 case SADB_X_EXT_SA2: 6926 /* duplicate check */ 6927 /* 6928 * XXX Are there duplication payloads of either 6929 * KEY_AUTH or KEY_ENCRYPT ? 6930 */ 6931 if (mhp->ext[ext->sadb_ext_type] != NULL) { 6932 ipseclog((LOG_DEBUG, 6933 "key_align: duplicate ext_type %u " 6934 "is passed.\n", ext->sadb_ext_type)); 6935 m_freem(m); 6936 pfkeystat.out_dupext++; 6937 return EINVAL; 6938 } 6939 break; 6940 default: 6941 ipseclog((LOG_DEBUG, 6942 "key_align: invalid ext_type %u is passed.\n", 6943 ext->sadb_ext_type)); 6944 m_freem(m); 6945 pfkeystat.out_invexttype++; 6946 return EINVAL; 6947 } 6948 6949 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 6950 6951 if (key_validate_ext(ext, extlen)) { 6952 m_freem(m); 6953 pfkeystat.out_invlen++; 6954 return EINVAL; 6955 } 6956 6957 n = m_pulldown(m, off, extlen, &toff); 6958 if (!n) { 6959 /* m is already freed */ 6960 return ENOBUFS; 6961 } 6962 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 6963 6964 mhp->ext[ext->sadb_ext_type] = ext; 6965 mhp->extoff[ext->sadb_ext_type] = off; 6966 mhp->extlen[ext->sadb_ext_type] = extlen; 6967 } 6968 6969 if (off != end) { 6970 m_freem(m); 6971 pfkeystat.out_invlen++; 6972 return EINVAL; 6973 } 6974 6975 return 0; 6976 } 6977 6978 static int 6979 key_validate_ext(ext, len) 6980 const struct sadb_ext *ext; 6981 int len; 6982 { 6983 const struct sockaddr *sa; 6984 enum { NONE, ADDR } checktype = NONE; 6985 int baselen = 0; 6986 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 6987 6988 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 6989 return EINVAL; 6990 6991 /* if it does not match minimum/maximum length, bail */ 6992 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 6993 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 6994 return EINVAL; 6995 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 6996 return EINVAL; 6997 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 6998 return EINVAL; 6999 7000 /* more checks based on sadb_ext_type XXX need more */ 7001 switch (ext->sadb_ext_type) { 7002 case SADB_EXT_ADDRESS_SRC: 7003 case SADB_EXT_ADDRESS_DST: 7004 case SADB_EXT_ADDRESS_PROXY: 7005 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7006 checktype = ADDR; 7007 break; 7008 case SADB_EXT_IDENTITY_SRC: 7009 case SADB_EXT_IDENTITY_DST: 7010 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7011 SADB_X_IDENTTYPE_ADDR) { 7012 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7013 checktype = ADDR; 7014 } else 7015 checktype = NONE; 7016 break; 7017 default: 7018 checktype = NONE; 7019 break; 7020 } 7021 7022 switch (checktype) { 7023 case NONE: 7024 break; 7025 case ADDR: 7026 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7027 if (len < baselen + sal) 7028 return EINVAL; 7029 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7030 return EINVAL; 7031 break; 7032 } 7033 7034 return 0; 7035 } 7036 7037 void 7038 key_init() 7039 { 7040 int i; 7041 7042 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7043 LIST_INIT(&sptree[i]); 7044 } 7045 7046 LIST_INIT(&sahtree); 7047 7048 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7049 LIST_INIT(®tree[i]); 7050 } 7051 7052 #ifndef IPSEC_NONBLOCK_ACQUIRE 7053 LIST_INIT(&acqtree); 7054 #endif 7055 LIST_INIT(&spacqtree); 7056 7057 /* system default */ 7058 ip4_def_policy.policy = IPSEC_POLICY_NONE; 7059 ip4_def_policy.refcnt++; /*never reclaim this*/ 7060 7061 #ifndef IPSEC_DEBUG2 7062 timeout((void *)key_timehandler, (void *)0, hz); 7063 #endif /*IPSEC_DEBUG2*/ 7064 7065 /* initialize key statistics */ 7066 keystat.getspi_count = 1; 7067 7068 printf("IPsec: Initialized Security Association Processing.\n"); 7069 7070 return; 7071 } 7072 7073 /* 7074 * XXX: maybe This function is called after INBOUND IPsec processing. 7075 * 7076 * Special check for tunnel-mode packets. 7077 * We must make some checks for consistency between inner and outer IP header. 7078 * 7079 * xxx more checks to be provided 7080 */ 7081 int 7082 key_checktunnelsanity(sav, family, src, dst) 7083 struct secasvar *sav; 7084 u_int family; 7085 caddr_t src; 7086 caddr_t dst; 7087 { 7088 /* sanity check */ 7089 if (sav->sah == NULL) 7090 panic("sav->sah == NULL at key_checktunnelsanity"); 7091 7092 /* XXX: check inner IP header */ 7093 7094 return 1; 7095 } 7096 7097 #if 0 7098 #define hostnamelen strlen(hostname) 7099 7100 /* 7101 * Get FQDN for the host. 7102 * If the administrator configured hostname (by hostname(1)) without 7103 * domain name, returns nothing. 7104 */ 7105 static const char * 7106 key_getfqdn() 7107 { 7108 int i; 7109 int hasdot; 7110 static char fqdn[MAXHOSTNAMELEN + 1]; 7111 7112 if (!hostnamelen) 7113 return NULL; 7114 7115 /* check if it comes with domain name. */ 7116 hasdot = 0; 7117 for (i = 0; i < hostnamelen; i++) { 7118 if (hostname[i] == '.') 7119 hasdot++; 7120 } 7121 if (!hasdot) 7122 return NULL; 7123 7124 /* NOTE: hostname may not be NUL-terminated. */ 7125 bzero(fqdn, sizeof(fqdn)); 7126 bcopy(hostname, fqdn, hostnamelen); 7127 fqdn[hostnamelen] = '\0'; 7128 return fqdn; 7129 } 7130 7131 /* 7132 * get username@FQDN for the host/user. 7133 */ 7134 static const char * 7135 key_getuserfqdn() 7136 { 7137 const char *host; 7138 static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2]; 7139 struct proc *p = curproc; 7140 char *q; 7141 7142 if (!p || !p->p_pgrp || !p->p_pgrp->pg_session) 7143 return NULL; 7144 if (!(host = key_getfqdn())) 7145 return NULL; 7146 7147 /* NOTE: s_login may not be-NUL terminated. */ 7148 bzero(userfqdn, sizeof(userfqdn)); 7149 bcopy(p->p_pgrp->pg_session->s_login, userfqdn, MAXLOGNAME); 7150 userfqdn[MAXLOGNAME] = '\0'; /* safeguard */ 7151 q = userfqdn + strlen(userfqdn); 7152 *q++ = '@'; 7153 bcopy(host, q, strlen(host)); 7154 q += strlen(host); 7155 *q++ = '\0'; 7156 7157 return userfqdn; 7158 } 7159 #endif 7160 7161 /* record data transfer on SA, and update timestamps */ 7162 void 7163 key_sa_recordxfer(sav, m) 7164 struct secasvar *sav; 7165 struct mbuf *m; 7166 { 7167 KASSERT(sav != NULL, ("key_sa_recordxfer: Null secasvar")); 7168 KASSERT(m != NULL, ("key_sa_recordxfer: Null mbuf")); 7169 if (!sav->lft_c) 7170 return; 7171 7172 /* 7173 * XXX Currently, there is a difference of bytes size 7174 * between inbound and outbound processing. 7175 */ 7176 sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len; 7177 /* to check bytes lifetime is done in key_timehandler(). */ 7178 7179 /* 7180 * We use the number of packets as the unit of 7181 * sadb_lifetime_allocations. We increment the variable 7182 * whenever {esp,ah}_{in,out}put is called. 7183 */ 7184 sav->lft_c->sadb_lifetime_allocations++; 7185 /* XXX check for expires? */ 7186 7187 /* 7188 * NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock, 7189 * in seconds. HARD and SOFT lifetime are measured by the time 7190 * difference (again in seconds) from sadb_lifetime_usetime. 7191 * 7192 * usetime 7193 * v expire expire 7194 * -----+-----+--------+---> t 7195 * <--------------> HARD 7196 * <-----> SOFT 7197 */ 7198 sav->lft_c->sadb_lifetime_usetime = time_second; 7199 /* XXX check for expires? */ 7200 7201 return; 7202 } 7203 7204 /* dumb version */ 7205 void 7206 key_sa_routechange(dst) 7207 struct sockaddr *dst; 7208 { 7209 struct secashead *sah; 7210 struct route *ro; 7211 7212 LIST_FOREACH(sah, &sahtree, chain) { 7213 ro = &sah->sa_route; 7214 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7215 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7216 RTFREE(ro->ro_rt); 7217 ro->ro_rt = (struct rtentry *)NULL; 7218 } 7219 } 7220 7221 return; 7222 } 7223 7224 static void 7225 key_sa_chgstate(sav, state) 7226 struct secasvar *sav; 7227 u_int8_t state; 7228 { 7229 if (sav == NULL) 7230 panic("key_sa_chgstate called with sav == NULL"); 7231 7232 if (sav->state == state) 7233 return; 7234 7235 if (__LIST_CHAINED(sav)) 7236 LIST_REMOVE(sav, chain); 7237 7238 sav->state = state; 7239 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7240 } 7241 7242 void 7243 key_sa_stir_iv(sav) 7244 struct secasvar *sav; 7245 { 7246 7247 if (!sav->iv) 7248 panic("key_sa_stir_iv called with sav == NULL"); 7249 key_randomfill(sav->iv, sav->ivlen); 7250 } 7251 7252 /* XXX too much? */ 7253 static struct mbuf * 7254 key_alloc_mbuf(l) 7255 int l; 7256 { 7257 struct mbuf *m = NULL, *n; 7258 int len, t; 7259 7260 len = l; 7261 while (len > 0) { 7262 MGET(n, M_DONTWAIT, MT_DATA); 7263 if (n && len > MLEN) 7264 MCLGET(n, M_DONTWAIT); 7265 if (!n) { 7266 m_freem(m); 7267 return NULL; 7268 } 7269 7270 n->m_next = NULL; 7271 n->m_len = 0; 7272 n->m_len = M_TRAILINGSPACE(n); 7273 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7274 if (n->m_len > len) { 7275 t = (n->m_len - len) & ~(sizeof(long) - 1); 7276 n->m_data += t; 7277 n->m_len = len; 7278 } 7279 7280 len -= n->m_len; 7281 7282 if (m) 7283 m_cat(m, n); 7284 else 7285 m = n; 7286 } 7287 7288 return m; 7289 }
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