1 /* $NetBSD: ipsec.c,v 1.57 2012/12/07 15:29:38 christos Exp $ */ 2 /* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam Exp $ */ 3 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.57 2012/12/07 15:29:38 christos Exp $"); 36 37 /* 38 * IPsec controller part. 39 */ 40 41 #include "opt_inet.h" 42 #ifdef __FreeBSD__ 43 #include "opt_inet6.h" 44 #endif 45 #include "opt_ipsec.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/domain.h> 52 #include <sys/protosw.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/errno.h> 56 #include <sys/time.h> 57 #include <sys/kernel.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/proc.h> 61 #include <sys/kauth.h> 62 63 #include <net/if.h> 64 #include <net/route.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/ip.h> 69 #include <netinet/ip_var.h> 70 #include <netinet/in_var.h> 71 #include <netinet/udp.h> 72 #include <netinet/udp_var.h> 73 #include <netinet/tcp.h> 74 #include <netinet/udp.h> 75 #include <netinet/ip_icmp.h> 76 77 #include <netinet/ip6.h> 78 #ifdef INET6 79 #include <netinet6/ip6_var.h> 80 #endif 81 #include <netinet/in_pcb.h> 82 #ifdef INET6 83 #include <netinet6/in6_pcb.h> 84 #include <netinet/icmp6.h> 85 #endif 86 87 #include <netipsec/ipsec.h> 88 #include <netipsec/ipsec_var.h> 89 #include <netipsec/ipsec_private.h> 90 #ifdef INET6 91 #include <netipsec/ipsec6.h> 92 #endif 93 #include <netipsec/ah_var.h> 94 #include <netipsec/esp_var.h> 95 #include <netipsec/ipcomp.h> /*XXX*/ 96 #include <netipsec/ipcomp_var.h> 97 98 #include <netipsec/key.h> 99 #include <netipsec/keydb.h> 100 #include <netipsec/key_debug.h> 101 102 #include <netipsec/xform.h> 103 104 #include <netipsec/ipsec_osdep.h> 105 106 #include <net/net_osdep.h> 107 108 #ifdef IPSEC_DEBUG 109 int ipsec_debug = 1; 110 111 /* 112 * When set to 1, IPsec will send packets with the same sequence number. 113 * This allows to verify if the other side has proper replay attacks detection. 114 */ 115 int ipsec_replay = 0; 116 117 /* 118 * When set 1, IPsec will send packets with corrupted HMAC. 119 * This allows to verify if the other side properly detects modified packets. 120 */ 121 int ipsec_integrity = 0; 122 #else 123 int ipsec_debug = 0; 124 #endif 125 126 percpu_t *ipsecstat_percpu; 127 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 128 int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */ 129 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 130 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 131 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 132 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 133 struct secpolicy ip4_def_policy; 134 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 135 int ip4_esp_randpad = -1; 136 137 #ifdef __NetBSD__ 138 u_int ipsec_spdgen = 1; /* SPD generation # */ 139 140 static struct secpolicy *ipsec_checkpcbcache (struct mbuf *, 141 struct inpcbpolicy *, int); 142 static int ipsec_fillpcbcache (struct inpcbpolicy *, struct mbuf *, 143 struct secpolicy *, int); 144 static int ipsec_invalpcbcache (struct inpcbpolicy *, int); 145 #endif /* __NetBSD__ */ 146 147 /* 148 * Crypto support requirements: 149 * 150 * 1 require hardware support 151 * -1 require software support 152 * 0 take anything 153 */ 154 int crypto_support = 0; 155 156 static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int, 157 PCB_T *, int *); 158 159 #ifdef __FreeBSD__ 160 SYSCTL_DECL(_net_inet_ipsec); 161 162 /* net.inet.ipsec */ 163 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 164 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 165 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 166 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 167 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 168 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 169 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 170 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 171 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 172 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 173 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 174 ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, ""); 175 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 176 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 177 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 178 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 179 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 180 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 181 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 182 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 183 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 184 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 185 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 186 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 187 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 188 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 189 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, 190 "Emulate replay attack"); 191 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, 192 &ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 193 #endif /* __FreeBSD__ */ 194 195 #ifdef INET6 196 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 197 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 198 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 199 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 200 struct secpolicy ip6_def_policy; 201 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 202 int ip6_esp_randpad = -1; 203 204 205 #ifdef __FreeBSD__ 206 SYSCTL_DECL(_net_inet6_ipsec6); 207 208 /* net.inet6.ipsec6 */ 209 #ifdef COMPAT_KAME 210 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 211 0,0, compat_ipsecstats_sysctl, "S", ""); 212 #endif /* COMPAT_KAME */ 213 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 214 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 215 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 216 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 217 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 218 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 219 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 220 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 221 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 222 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 223 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 224 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 225 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 226 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 227 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 228 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 229 #endif /* INET6 */ 230 #endif /* __FreeBSD__ */ 231 232 static int ipsec4_setspidx_inpcb (struct mbuf *, struct inpcb *); 233 #ifdef INET6 234 static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *); 235 #endif 236 static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int); 237 static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int); 238 static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *); 239 #ifdef INET6 240 static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int); 241 static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *); 242 #endif 243 static void ipsec_delpcbpolicy (struct inpcbpolicy *); 244 static struct secpolicy *ipsec_deepcopy_policy (const struct secpolicy *); 245 static int ipsec_set_policy (struct secpolicy **, int, const void *, size_t, 246 kauth_cred_t); 247 static int ipsec_get_policy (struct secpolicy *, struct mbuf **); 248 static void vshiftl (unsigned char *, int, int); 249 static size_t ipsec_hdrsiz (const struct secpolicy *); 250 251 #ifdef __NetBSD__ 252 /* 253 * Try to validate and use cached policy on a PCB. 254 */ 255 static struct secpolicy * 256 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir) 257 { 258 struct secpolicyindex spidx; 259 260 switch (dir) { 261 case IPSEC_DIR_INBOUND: 262 case IPSEC_DIR_OUTBOUND: 263 case IPSEC_DIR_ANY: 264 break; 265 default: 266 return NULL; 267 } 268 #ifdef DIAGNOSTIC 269 if (pcbsp == NULL) { 270 printf("ipsec_checkpcbcache: NULL pcbsp\n"); 271 /* XXX panic? */ 272 return NULL; 273 } 274 #endif 275 276 #ifdef DIAGNOSTIC 277 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 278 panic("dir too big in ipsec_checkpcbcache"); 279 #endif 280 /* SPD table change invalidate all the caches. */ 281 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) { 282 ipsec_invalpcbcache(pcbsp, dir); 283 return NULL; 284 } 285 if (!pcbsp->sp_cache[dir].cachesp) 286 return NULL; 287 if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) { 288 ipsec_invalpcbcache(pcbsp, dir); 289 return NULL; 290 } 291 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) { 292 if (!pcbsp->sp_cache[dir].cachesp) 293 return NULL; 294 if (ipsec_setspidx(m, &spidx, 1) != 0) 295 return NULL; 296 297 /* 298 * We have to make an exact match here since the cached rule 299 * might have lower priority than a rule that would otherwise 300 * have matched the packet. 301 */ 302 303 if (memcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, sizeof(spidx))) 304 return NULL; 305 306 } else { 307 /* 308 * The pcb is connected, and the L4 code is sure that: 309 * - outgoing side uses inp_[lf]addr 310 * - incoming side looks up policy after inpcb lookup 311 * and address pair is know to be stable. We do not need 312 * to generate spidx again, nor check the address match again. 313 * 314 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 315 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 316 */ 317 } 318 319 pcbsp->sp_cache[dir].cachesp->lastused = time_second; 320 pcbsp->sp_cache[dir].cachesp->refcnt++; 321 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 322 printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n", 323 pcbsp->sp_cache[dir].cachesp->refcnt, 324 pcbsp->sp_cache[dir].cachesp)); 325 return pcbsp->sp_cache[dir].cachesp; 326 } 327 328 static int 329 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 330 struct secpolicy *sp, int dir) 331 { 332 333 switch (dir) { 334 case IPSEC_DIR_INBOUND: 335 case IPSEC_DIR_OUTBOUND: 336 break; 337 default: 338 return EINVAL; 339 } 340 #ifdef DIAGNOSTIC 341 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 342 panic("dir too big in ipsec_fillpcbcache"); 343 #endif 344 345 if (pcbsp->sp_cache[dir].cachesp) 346 KEY_FREESP(&pcbsp->sp_cache[dir].cachesp); 347 pcbsp->sp_cache[dir].cachesp = NULL; 348 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE; 349 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 350 return EINVAL; 351 } 352 pcbsp->sp_cache[dir].cachesp = sp; 353 if (pcbsp->sp_cache[dir].cachesp) { 354 pcbsp->sp_cache[dir].cachesp->refcnt++; 355 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 356 printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n", 357 pcbsp->sp_cache[dir].cachesp->refcnt, 358 pcbsp->sp_cache[dir].cachesp)); 359 360 /* 361 * If the PCB is connected, we can remember a hint to 362 * possibly short-circuit IPsec processing in other places. 363 */ 364 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 365 switch (pcbsp->sp_cache[dir].cachesp->policy) { 366 case IPSEC_POLICY_NONE: 367 case IPSEC_POLICY_BYPASS: 368 pcbsp->sp_cache[dir].cachehint = 369 IPSEC_PCBHINT_NO; 370 break; 371 default: 372 pcbsp->sp_cache[dir].cachehint = 373 IPSEC_PCBHINT_YES; 374 } 375 } 376 } 377 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 378 379 return 0; 380 } 381 382 static int 383 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 384 { 385 int i; 386 387 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 388 if (dir != IPSEC_DIR_ANY && i != dir) 389 continue; 390 if (pcbsp->sp_cache[i].cachesp) 391 KEY_FREESP(&pcbsp->sp_cache[i].cachesp); 392 pcbsp->sp_cache[i].cachesp = NULL; 393 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE; 394 pcbsp->sp_cache[i].cachegen = 0; 395 memset(&pcbsp->sp_cache[i].cacheidx, 0, 396 sizeof(pcbsp->sp_cache[i].cacheidx)); 397 } 398 return 0; 399 } 400 401 void 402 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 403 { 404 405 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 406 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 407 } 408 409 void 410 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 411 { 412 413 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 414 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 415 } 416 417 void 418 ipsec_invalpcbcacheall(void) 419 { 420 421 if (ipsec_spdgen == UINT_MAX) 422 ipsec_spdgen = 1; 423 else 424 ipsec_spdgen++; 425 } 426 #endif /* __NetBSD__ */ 427 428 /* 429 * Return a held reference to the default SP. 430 */ 431 static struct secpolicy * 432 key_allocsp_default(int af, const char *where, int tag) 433 { 434 struct secpolicy *sp; 435 436 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 437 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 438 439 switch(af) { 440 case AF_INET: 441 sp = &ip4_def_policy; 442 break; 443 #ifdef INET6 444 case AF_INET6: 445 sp = &ip6_def_policy; 446 break; 447 #endif 448 default: 449 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 450 printf("key_allocsp_default : unexpected protocol family %u\n", 451 af)); 452 return NULL; 453 } 454 455 if (sp->policy != IPSEC_POLICY_DISCARD && 456 sp->policy != IPSEC_POLICY_NONE) { 457 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 458 sp->policy, IPSEC_POLICY_NONE)); 459 sp->policy = IPSEC_POLICY_NONE; 460 } 461 sp->refcnt++; 462 463 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 464 printf("DP key_allocsp_default returns SP:%p (%u)\n", 465 sp, sp->refcnt)); 466 return sp; 467 } 468 #define KEY_ALLOCSP_DEFAULT(af) \ 469 key_allocsp_default((af),__FILE__, __LINE__) 470 471 /* 472 * For OUTBOUND packet having a socket. Searching SPD for packet, 473 * and return a pointer to SP. 474 * OUT: NULL: no apropreate SP found, the following value is set to error. 475 * 0 : bypass 476 * EACCES : discard packet. 477 * ENOENT : ipsec_acquire() in progress, maybe. 478 * others : error occurred. 479 * others: a pointer to SP 480 * 481 * NOTE: IPv6 mapped address concern is implemented here. 482 */ 483 struct secpolicy * 484 ipsec_getpolicy(const struct tdb_ident *tdbi, u_int dir) 485 { 486 struct secpolicy *sp; 487 488 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 489 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 490 ("ipsec_getpolicy: invalid direction %u", dir)); 491 492 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 493 if (sp == NULL) /*XXX????*/ 494 sp = KEY_ALLOCSP_DEFAULT(tdbi->dst.sa.sa_family); 495 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 496 return sp; 497 } 498 499 /* 500 * For OUTBOUND packet having a socket. Searching SPD for packet, 501 * and return a pointer to SP. 502 * OUT: NULL: no apropreate SP found, the following value is set to error. 503 * 0 : bypass 504 * EACCES : discard packet. 505 * ENOENT : ipsec_acquire() in progress, maybe. 506 * others : error occurred. 507 * others: a pointer to SP 508 * 509 * NOTE: IPv6 mapped address concern is implemented here. 510 */ 511 static struct secpolicy * 512 ipsec_getpolicybysock(struct mbuf *m, u_int dir, PCB_T *inp, int *error) 513 { 514 struct inpcbpolicy *pcbsp = NULL; 515 struct secpolicy *currsp = NULL; /* policy on socket */ 516 struct secpolicy *sp; 517 int af; 518 519 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 520 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 521 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 522 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 523 ("ipsec_getpolicybysock: invalid direction %u", dir)); 524 525 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, 526 ("ipsec_getppolicybysock: null socket\n")); 527 528 /* XXX FIXME inpcb/in6pcb vs socket*/ 529 af = PCB_FAMILY(inp); 530 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 531 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 532 533 #ifdef __NetBSD__ 534 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache")); 535 /* If we have a cached entry, and if it is still valid, use it. */ 536 IPSEC_STATINC(IPSEC_STAT_SPDCACHELOOKUP); 537 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); 538 if (currsp) { 539 *error = 0; 540 return currsp; 541 } 542 IPSEC_STATINC(IPSEC_STAT_SPDCACHEMISS); 543 #endif /* __NetBSD__ */ 544 545 switch (af) { 546 case AF_INET: { 547 struct inpcb *in4p = PCB_TO_IN4PCB(inp); 548 /* set spidx in pcb */ 549 *error = ipsec4_setspidx_inpcb(m, in4p); 550 pcbsp = in4p->inp_sp; 551 break; 552 } 553 554 #if defined(INET6) 555 case AF_INET6: { 556 struct in6pcb *in6p = PCB_TO_IN6PCB(inp); 557 /* set spidx in pcb */ 558 *error = ipsec6_setspidx_in6pcb(m, in6p); 559 pcbsp = in6p->in6p_sp; 560 break; 561 } 562 #endif 563 default: 564 *error = EPFNOSUPPORT; 565 break; 566 } 567 if (*error) 568 return NULL; 569 570 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 571 switch (dir) { 572 case IPSEC_DIR_INBOUND: 573 currsp = pcbsp->sp_in; 574 break; 575 case IPSEC_DIR_OUTBOUND: 576 currsp = pcbsp->sp_out; 577 break; 578 } 579 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 580 581 if (pcbsp->priv) { /* when privilieged socket */ 582 switch (currsp->policy) { 583 case IPSEC_POLICY_BYPASS: 584 case IPSEC_POLICY_IPSEC: 585 currsp->refcnt++; 586 sp = currsp; 587 break; 588 589 case IPSEC_POLICY_ENTRUST: 590 /* look for a policy in SPD */ 591 sp = KEY_ALLOCSP(&currsp->spidx, dir); 592 if (sp == NULL) /* no SP found */ 593 sp = KEY_ALLOCSP_DEFAULT(af); 594 break; 595 596 default: 597 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 598 "Invalid policy for PCB %d\n", currsp->policy)); 599 *error = EINVAL; 600 return NULL; 601 } 602 } else { /* unpriv, SPD has policy */ 603 sp = KEY_ALLOCSP(&currsp->spidx, dir); 604 if (sp == NULL) { /* no SP found */ 605 switch (currsp->policy) { 606 case IPSEC_POLICY_BYPASS: 607 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 608 "Illegal policy for non-priviliged defined %d\n", 609 currsp->policy)); 610 *error = EINVAL; 611 return NULL; 612 613 case IPSEC_POLICY_ENTRUST: 614 sp = KEY_ALLOCSP_DEFAULT(af); 615 break; 616 617 case IPSEC_POLICY_IPSEC: 618 currsp->refcnt++; 619 sp = currsp; 620 break; 621 622 default: 623 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 624 "Invalid policy for PCB %d\n", currsp->policy)); 625 *error = EINVAL; 626 return NULL; 627 } 628 } 629 } 630 IPSEC_ASSERT(sp != NULL, 631 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 632 pcbsp->priv, currsp->policy)); 633 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 634 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 635 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 636 sp, sp->refcnt)); 637 #ifdef __NetBSD__ 638 ipsec_fillpcbcache(pcbsp, m, sp, dir); 639 #endif /* __NetBSD__ */ 640 return sp; 641 } 642 643 /* 644 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 645 * and return a pointer to SP. 646 * OUT: positive: a pointer to the entry for security policy leaf matched. 647 * NULL: no apropreate SP found, the following value is set to error. 648 * 0 : bypass 649 * EACCES : discard packet. 650 * ENOENT : ipsec_acquire() in progress, maybe. 651 * others : error occurred. 652 */ 653 struct secpolicy * 654 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) 655 { 656 struct secpolicyindex spidx; 657 struct secpolicy *sp; 658 659 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 660 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 661 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 662 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 663 664 sp = NULL; 665 666 /* Make an index to look for a policy. */ 667 *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1); 668 if (*error != 0) { 669 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 670 " dir %u flag %u\n", dir, flag)); 671 memset(&spidx, 0, sizeof (spidx)); 672 return NULL; 673 } 674 675 spidx.dir = dir; 676 677 if (key_havesp(dir)) { 678 sp = KEY_ALLOCSP(&spidx, dir); 679 } 680 681 if (sp == NULL) /* no SP found, use system default */ 682 sp = KEY_ALLOCSP_DEFAULT(spidx.dst.sa.sa_family); 683 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 684 return sp; 685 } 686 687 struct secpolicy * 688 ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 689 struct inpcb *inp) 690 { 691 struct secpolicy *sp; 692 693 *error = 0; 694 695 696 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 697 if (inp == NULL || inp->inp_socket == NULL) { 698 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 699 } else 700 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); 701 if (sp == NULL) { 702 IPSEC_ASSERT(*error != 0, 703 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 704 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); 705 return NULL; 706 } 707 IPSEC_ASSERT(*error == 0, 708 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 709 switch (sp->policy) { 710 case IPSEC_POLICY_ENTRUST: 711 default: 712 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 713 /* fall thru... */ 714 case IPSEC_POLICY_DISCARD: 715 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); 716 *error = -EINVAL; /* packet is discarded by caller */ 717 break; 718 case IPSEC_POLICY_BYPASS: 719 case IPSEC_POLICY_NONE: 720 KEY_FREESP(&sp); 721 sp = NULL; /* NB: force NULL result */ 722 break; 723 case IPSEC_POLICY_IPSEC: 724 if (sp->req == NULL) /* acquire an SA */ 725 *error = key_spdacquire(sp); 726 break; 727 } 728 if (*error != 0) { 729 KEY_FREESP(&sp); 730 sp = NULL; 731 DPRINTF(("%s: done, error %d\n", __func__, *error)); 732 } 733 return sp; 734 } 735 736 #ifdef INET6 737 struct secpolicy * 738 ipsec6_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 739 struct in6pcb *in6p) 740 { 741 struct secpolicy *sp; 742 743 *error = 0; 744 745 746 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 747 if (in6p == NULL || in6p->in6p_socket == NULL) { 748 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 749 } else 750 sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error); 751 if (sp == NULL) { 752 IPSEC_ASSERT(*error != 0, 753 ("ipsec6_checkpolicy: getpolicy failed w/o error")); 754 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); 755 return NULL; 756 } 757 IPSEC_ASSERT(*error == 0, 758 ("ipsec6_checkpolicy: sp w/ error set to %u", *error)); 759 switch (sp->policy) { 760 case IPSEC_POLICY_ENTRUST: 761 default: 762 printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy); 763 /* fall thru... */ 764 case IPSEC_POLICY_DISCARD: 765 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); 766 *error = -EINVAL; /* packet is discarded by caller */ 767 break; 768 case IPSEC_POLICY_BYPASS: 769 case IPSEC_POLICY_NONE: 770 KEY_FREESP(&sp); 771 sp = NULL; /* NB: force NULL result */ 772 break; 773 case IPSEC_POLICY_IPSEC: 774 if (sp->req == NULL) /* acquire an SA */ 775 *error = key_spdacquire(sp); 776 break; 777 } 778 if (*error != 0) { 779 KEY_FREESP(&sp); 780 sp = NULL; 781 DPRINTF(("%s: done, error %d\n", __func__, *error)); 782 } 783 return sp; 784 } 785 #endif /* INET6 */ 786 787 static int 788 ipsec4_setspidx_inpcb(struct mbuf *m, struct inpcb *pcb) 789 { 790 int error; 791 792 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 793 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 794 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 795 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 796 797 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 798 if (error == 0) { 799 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 800 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 801 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 802 } else { 803 memset(&pcb->inp_sp->sp_in->spidx, 0, 804 sizeof (pcb->inp_sp->sp_in->spidx)); 805 memset(&pcb->inp_sp->sp_out->spidx, 0, 806 sizeof (pcb->inp_sp->sp_in->spidx)); 807 } 808 return error; 809 } 810 811 #ifdef INET6 812 static int 813 ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb) 814 { 815 struct secpolicyindex *spidx; 816 int error; 817 818 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 819 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 820 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 821 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 822 823 memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx)); 824 memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx)); 825 826 spidx = &pcb->in6p_sp->sp_in->spidx; 827 error = ipsec_setspidx(m, spidx, 1); 828 if (error) 829 goto bad; 830 spidx->dir = IPSEC_DIR_INBOUND; 831 832 spidx = &pcb->in6p_sp->sp_out->spidx; 833 error = ipsec_setspidx(m, spidx, 1); 834 if (error) 835 goto bad; 836 spidx->dir = IPSEC_DIR_OUTBOUND; 837 838 return 0; 839 840 bad: 841 memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx)); 842 memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx)); 843 return error; 844 } 845 #endif 846 847 /* 848 * configure security policy index (src/dst/proto/sport/dport) 849 * by looking at the content of mbuf. 850 * the caller is responsible for error recovery (like clearing up spidx). 851 */ 852 static int 853 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) 854 { 855 struct ip *ip = NULL; 856 struct ip ipbuf; 857 u_int v; 858 struct mbuf *n; 859 int len; 860 int error; 861 862 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 863 864 /* 865 * validate m->m_pkthdr.len. we see incorrect length if we 866 * mistakenly call this function with inconsistent mbuf chain 867 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 868 */ 869 len = 0; 870 for (n = m; n; n = n->m_next) 871 len += n->m_len; 872 if (m->m_pkthdr.len != len) { 873 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 874 printf("ipsec_setspidx: " 875 "total of m_len(%d) != pkthdr.len(%d), " 876 "ignored.\n", 877 len, m->m_pkthdr.len)); 878 return EINVAL; 879 } 880 881 if (m->m_pkthdr.len < sizeof(struct ip)) { 882 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 883 printf("ipsec_setspidx: " 884 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 885 m->m_pkthdr.len)); 886 return EINVAL; 887 } 888 889 if (m->m_len >= sizeof(*ip)) 890 ip = mtod(m, struct ip *); 891 else { 892 m_copydata(m, 0, sizeof(ipbuf), &ipbuf); 893 ip = &ipbuf; 894 } 895 v = ip->ip_v; 896 switch (v) { 897 case 4: 898 error = ipsec4_setspidx_ipaddr(m, spidx); 899 if (error) 900 return error; 901 ipsec4_get_ulp(m, spidx, needport); 902 return 0; 903 #ifdef INET6 904 case 6: 905 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 906 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 907 printf("ipsec_setspidx: " 908 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 909 "ignored.\n", m->m_pkthdr.len)); 910 return EINVAL; 911 } 912 error = ipsec6_setspidx_ipaddr(m, spidx); 913 if (error) 914 return error; 915 ipsec6_get_ulp(m, spidx, needport); 916 return 0; 917 #endif 918 default: 919 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 920 printf("ipsec_setspidx: " 921 "unknown IP version %u, ignored.\n", v)); 922 return EINVAL; 923 } 924 } 925 926 static void 927 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 928 { 929 u_int8_t nxt; 930 int off; 931 932 /* sanity check */ 933 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 934 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), 935 ("ipsec4_get_ulp: packet too short")); 936 937 /* NB: ip_input() flips it into host endian XXX need more checking */ 938 if (m->m_len >= sizeof(struct ip)) { 939 struct ip *ip = mtod(m, struct ip *); 940 if (ip->ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK)) 941 goto done; 942 off = ip->ip_hl << 2; 943 nxt = ip->ip_p; 944 } else { 945 struct ip ih; 946 947 m_copydata(m, 0, sizeof (struct ip), &ih); 948 if (ih.ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK)) 949 goto done; 950 off = ih.ip_hl << 2; 951 nxt = ih.ip_p; 952 } 953 954 while (off < m->m_pkthdr.len) { 955 struct ip6_ext ip6e; 956 struct tcphdr th; 957 struct udphdr uh; 958 struct icmp icmph; 959 960 switch (nxt) { 961 case IPPROTO_TCP: 962 spidx->ul_proto = nxt; 963 if (!needport) 964 goto done_proto; 965 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 966 goto done; 967 m_copydata(m, off, sizeof (th), &th); 968 spidx->src.sin.sin_port = th.th_sport; 969 spidx->dst.sin.sin_port = th.th_dport; 970 return; 971 case IPPROTO_UDP: 972 spidx->ul_proto = nxt; 973 if (!needport) 974 goto done_proto; 975 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 976 goto done; 977 m_copydata(m, off, sizeof (uh), &uh); 978 spidx->src.sin.sin_port = uh.uh_sport; 979 spidx->dst.sin.sin_port = uh.uh_dport; 980 return; 981 case IPPROTO_AH: 982 if (m->m_pkthdr.len > off + sizeof(ip6e)) 983 goto done; 984 /* XXX sigh, this works but is totally bogus */ 985 m_copydata(m, off, sizeof(ip6e), &ip6e); 986 off += (ip6e.ip6e_len + 2) << 2; 987 nxt = ip6e.ip6e_nxt; 988 break; 989 case IPPROTO_ICMP: 990 spidx->ul_proto = nxt; 991 if (off + sizeof(struct icmp) > m->m_pkthdr.len) 992 return; 993 m_copydata(m, off, sizeof(icmph), &icmph); 994 ((struct sockaddr_in *)&spidx->src)->sin_port = 995 htons((uint16_t)icmph.icmp_type); 996 ((struct sockaddr_in *)&spidx->dst)->sin_port = 997 htons((uint16_t)icmph.icmp_code); 998 return; 999 default: 1000 /* XXX intermediate headers??? */ 1001 spidx->ul_proto = nxt; 1002 goto done_proto; 1003 } 1004 } 1005 done: 1006 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1007 done_proto: 1008 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 1009 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 1010 } 1011 1012 /* assumes that m is sane */ 1013 static int 1014 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1015 { 1016 static const struct sockaddr_in template = { 1017 sizeof (struct sockaddr_in), 1018 AF_INET, 1019 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 1020 }; 1021 1022 spidx->src.sin = template; 1023 spidx->dst.sin = template; 1024 1025 if (m->m_len < sizeof (struct ip)) { 1026 m_copydata(m, offsetof(struct ip, ip_src), 1027 sizeof (struct in_addr), 1028 &spidx->src.sin.sin_addr); 1029 m_copydata(m, offsetof(struct ip, ip_dst), 1030 sizeof (struct in_addr), 1031 &spidx->dst.sin.sin_addr); 1032 } else { 1033 struct ip *ip = mtod(m, struct ip *); 1034 spidx->src.sin.sin_addr = ip->ip_src; 1035 spidx->dst.sin.sin_addr = ip->ip_dst; 1036 } 1037 1038 spidx->prefs = sizeof(struct in_addr) << 3; 1039 spidx->prefd = sizeof(struct in_addr) << 3; 1040 1041 return 0; 1042 } 1043 1044 #ifdef INET6 1045 static void 1046 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, 1047 int needport) 1048 { 1049 int off, nxt; 1050 struct tcphdr th; 1051 struct udphdr uh; 1052 struct icmp6_hdr icmph; 1053 1054 /* sanity check */ 1055 if (m == NULL) 1056 panic("ipsec6_get_ulp: NULL pointer was passed"); 1057 1058 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1059 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 1060 1061 /* set default */ 1062 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1063 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1064 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1065 1066 nxt = -1; 1067 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1068 if (off < 0 || m->m_pkthdr.len < off) 1069 return; 1070 1071 switch (nxt) { 1072 case IPPROTO_TCP: 1073 spidx->ul_proto = nxt; 1074 if (!needport) 1075 break; 1076 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1077 break; 1078 m_copydata(m, off, sizeof(th), &th); 1079 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1080 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1081 break; 1082 case IPPROTO_UDP: 1083 spidx->ul_proto = nxt; 1084 if (!needport) 1085 break; 1086 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1087 break; 1088 m_copydata(m, off, sizeof(uh), &uh); 1089 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1090 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1091 break; 1092 case IPPROTO_ICMPV6: 1093 spidx->ul_proto = nxt; 1094 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 1095 break; 1096 m_copydata(m, off, sizeof(icmph), &icmph); 1097 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 1098 htons((uint16_t)icmph.icmp6_type); 1099 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 1100 htons((uint16_t)icmph.icmp6_code); 1101 break; 1102 default: 1103 /* XXX intermediate headers??? */ 1104 spidx->ul_proto = nxt; 1105 break; 1106 } 1107 } 1108 1109 /* assumes that m is sane */ 1110 static int 1111 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1112 { 1113 struct ip6_hdr *ip6 = NULL; 1114 struct ip6_hdr ip6buf; 1115 struct sockaddr_in6 *sin6; 1116 1117 if (m->m_len >= sizeof(*ip6)) 1118 ip6 = mtod(m, struct ip6_hdr *); 1119 else { 1120 m_copydata(m, 0, sizeof(ip6buf), &ip6buf); 1121 ip6 = &ip6buf; 1122 } 1123 1124 sin6 = (struct sockaddr_in6 *)&spidx->src; 1125 memset(sin6, 0, sizeof(*sin6)); 1126 sin6->sin6_family = AF_INET6; 1127 sin6->sin6_len = sizeof(struct sockaddr_in6); 1128 memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); 1129 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1130 sin6->sin6_addr.s6_addr16[1] = 0; 1131 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1132 } 1133 spidx->prefs = sizeof(struct in6_addr) << 3; 1134 1135 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1136 memset(sin6, 0, sizeof(*sin6)); 1137 sin6->sin6_family = AF_INET6; 1138 sin6->sin6_len = sizeof(struct sockaddr_in6); 1139 memcpy(&sin6->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); 1140 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1141 sin6->sin6_addr.s6_addr16[1] = 0; 1142 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1143 } 1144 spidx->prefd = sizeof(struct in6_addr) << 3; 1145 1146 return 0; 1147 } 1148 #endif 1149 1150 static void 1151 ipsec_delpcbpolicy(struct inpcbpolicy *p) 1152 { 1153 free(p, M_SECA); 1154 } 1155 1156 /* initialize policy in PCB */ 1157 int 1158 ipsec_init_policy(struct socket *so, struct inpcbpolicy **policy) 1159 { 1160 struct inpcbpolicy *new; 1161 1162 /* sanity check. */ 1163 if (so == NULL || policy == NULL) 1164 panic("ipsec_init_policy: NULL pointer was passed"); 1165 1166 new = malloc(sizeof(*new), M_SECA, M_NOWAIT|M_ZERO); 1167 if (new == NULL) { 1168 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 1169 return ENOBUFS; 1170 } 1171 1172 if (IPSEC_PRIVILEGED_SO(so)) 1173 new->priv = 1; 1174 else 1175 new->priv = 0; 1176 1177 if ((new->sp_in = KEY_NEWSP()) == NULL) { 1178 ipsec_delpcbpolicy(new); 1179 return ENOBUFS; 1180 } 1181 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 1182 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 1183 1184 if ((new->sp_out = KEY_NEWSP()) == NULL) { 1185 KEY_FREESP(&new->sp_in); 1186 ipsec_delpcbpolicy(new); 1187 return ENOBUFS; 1188 } 1189 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 1190 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 1191 1192 *policy = new; 1193 1194 return 0; 1195 } 1196 1197 /* copy old ipsec policy into new */ 1198 int 1199 ipsec_copy_policy(const struct inpcbpolicy *old, struct inpcbpolicy *new) 1200 { 1201 struct secpolicy *sp; 1202 1203 sp = ipsec_deepcopy_policy(old->sp_in); 1204 if (sp) { 1205 KEY_FREESP(&new->sp_in); 1206 new->sp_in = sp; 1207 } else 1208 return ENOBUFS; 1209 1210 sp = ipsec_deepcopy_policy(old->sp_out); 1211 if (sp) { 1212 KEY_FREESP(&new->sp_out); 1213 new->sp_out = sp; 1214 } else 1215 return ENOBUFS; 1216 1217 new->priv = old->priv; 1218 1219 return 0; 1220 } 1221 1222 /* deep-copy a policy in PCB */ 1223 static struct secpolicy * 1224 ipsec_deepcopy_policy(const struct secpolicy *src) 1225 { 1226 struct ipsecrequest *newchain = NULL; 1227 const struct ipsecrequest *p; 1228 struct ipsecrequest **q; 1229 struct ipsecrequest *r; 1230 struct secpolicy *dst; 1231 1232 if (src == NULL) 1233 return NULL; 1234 dst = KEY_NEWSP(); 1235 if (dst == NULL) 1236 return NULL; 1237 1238 /* 1239 * deep-copy IPsec request chain. This is required since struct 1240 * ipsecrequest is not reference counted. 1241 */ 1242 q = &newchain; 1243 for (p = src->req; p; p = p->next) { 1244 *q = malloc(sizeof(**q), M_SECA, M_NOWAIT|M_ZERO); 1245 if (*q == NULL) 1246 goto fail; 1247 (*q)->next = NULL; 1248 1249 (*q)->saidx.proto = p->saidx.proto; 1250 (*q)->saidx.mode = p->saidx.mode; 1251 (*q)->level = p->level; 1252 (*q)->saidx.reqid = p->saidx.reqid; 1253 1254 memcpy(&(*q)->saidx.src, &p->saidx.src, sizeof((*q)->saidx.src)); 1255 memcpy(&(*q)->saidx.dst, &p->saidx.dst, sizeof((*q)->saidx.dst)); 1256 1257 (*q)->sav = NULL; 1258 (*q)->sp = dst; 1259 1260 q = &((*q)->next); 1261 } 1262 1263 dst->req = newchain; 1264 dst->state = src->state; 1265 dst->policy = src->policy; 1266 /* do not touch the refcnt fields */ 1267 1268 return dst; 1269 1270 fail: 1271 for (q = &newchain; *q; q = &r) { 1272 r = (*q)->next; 1273 free(*q, M_SECA); 1274 } 1275 return NULL; 1276 } 1277 1278 /* set policy and ipsec request if present. */ 1279 static int 1280 ipsec_set_policy( 1281 struct secpolicy **policy, 1282 int optname, 1283 const void *request, 1284 size_t len, 1285 kauth_cred_t cred 1286 ) 1287 { 1288 const struct sadb_x_policy *xpl; 1289 struct secpolicy *newsp = NULL; 1290 int error; 1291 1292 /* sanity check. */ 1293 if (policy == NULL || *policy == NULL || request == NULL) 1294 return EINVAL; 1295 if (len < sizeof(*xpl)) 1296 return EINVAL; 1297 xpl = (const struct sadb_x_policy *)request; 1298 1299 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1300 printf("ipsec_set_policy: passed policy\n"); 1301 kdebug_sadb_x_policy((const struct sadb_ext *)xpl)); 1302 1303 /* check policy type */ 1304 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1305 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1306 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1307 return EINVAL; 1308 1309 /* check privileged socket */ 1310 if (xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1311 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPSEC, 1312 KAUTH_REQ_NETWORK_IPSEC_BYPASS, NULL, NULL, NULL); 1313 if (error) 1314 return (error); 1315 } 1316 1317 /* allocation new SP entry */ 1318 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1319 return error; 1320 1321 newsp->state = IPSEC_SPSTATE_ALIVE; 1322 1323 /* clear old SP and set new SP */ 1324 KEY_FREESP(policy); 1325 *policy = newsp; 1326 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1327 printf("ipsec_set_policy: new policy\n"); 1328 kdebug_secpolicy(newsp)); 1329 1330 return 0; 1331 } 1332 1333 static int 1334 ipsec_get_policy(struct secpolicy *policy, struct mbuf **mp) 1335 { 1336 1337 /* sanity check. */ 1338 if (policy == NULL || mp == NULL) 1339 return EINVAL; 1340 1341 *mp = key_sp2msg(policy); 1342 if (!*mp) { 1343 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1344 return ENOBUFS; 1345 } 1346 1347 (*mp)->m_type = MT_DATA; 1348 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1349 printf("ipsec_get_policy:\n"); 1350 kdebug_mbuf(*mp)); 1351 1352 return 0; 1353 } 1354 1355 int 1356 ipsec4_set_policy(struct inpcb *inp, int optname, const void *request, 1357 size_t len, kauth_cred_t cred) 1358 { 1359 const struct sadb_x_policy *xpl; 1360 struct secpolicy **policy; 1361 1362 /* sanity check. */ 1363 if (inp == NULL || request == NULL) 1364 return EINVAL; 1365 if (len < sizeof(*xpl)) 1366 return EINVAL; 1367 xpl = (const struct sadb_x_policy *)request; 1368 1369 IPSEC_ASSERT(inp->inp_sp != NULL, 1370 ("ipsec4_set_policy(): null inp->in_sp")); 1371 1372 /* select direction */ 1373 switch (xpl->sadb_x_policy_dir) { 1374 case IPSEC_DIR_INBOUND: 1375 policy = &inp->inp_sp->sp_in; 1376 break; 1377 case IPSEC_DIR_OUTBOUND: 1378 policy = &inp->inp_sp->sp_out; 1379 break; 1380 default: 1381 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1382 xpl->sadb_x_policy_dir)); 1383 return EINVAL; 1384 } 1385 1386 return ipsec_set_policy(policy, optname, request, len, cred); 1387 } 1388 1389 int 1390 ipsec4_get_policy(struct inpcb *inp, const void *request, size_t len, 1391 struct mbuf **mp) 1392 { 1393 const struct sadb_x_policy *xpl; 1394 struct secpolicy *policy; 1395 1396 /* sanity check. */ 1397 if (inp == NULL || request == NULL || mp == NULL) 1398 return EINVAL; 1399 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1400 if (len < sizeof(*xpl)) 1401 return EINVAL; 1402 xpl = (const struct sadb_x_policy *)request; 1403 1404 /* select direction */ 1405 switch (xpl->sadb_x_policy_dir) { 1406 case IPSEC_DIR_INBOUND: 1407 policy = inp->inp_sp->sp_in; 1408 break; 1409 case IPSEC_DIR_OUTBOUND: 1410 policy = inp->inp_sp->sp_out; 1411 break; 1412 default: 1413 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1414 xpl->sadb_x_policy_dir)); 1415 return EINVAL; 1416 } 1417 1418 return ipsec_get_policy(policy, mp); 1419 } 1420 1421 /* delete policy in PCB */ 1422 int 1423 ipsec4_delete_pcbpolicy(struct inpcb *inp) 1424 { 1425 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1426 1427 if (inp->inp_sp == NULL) 1428 return 0; 1429 1430 if (inp->inp_sp->sp_in != NULL) 1431 KEY_FREESP(&inp->inp_sp->sp_in); 1432 1433 if (inp->inp_sp->sp_out != NULL) 1434 KEY_FREESP(&inp->inp_sp->sp_out); 1435 1436 #ifdef __NetBSD__ 1437 ipsec_invalpcbcache(inp->inp_sp, IPSEC_DIR_ANY); 1438 #endif 1439 1440 ipsec_delpcbpolicy(inp->inp_sp); 1441 inp->inp_sp = NULL; 1442 1443 return 0; 1444 } 1445 1446 #ifdef INET6 1447 int 1448 ipsec6_set_policy(struct in6pcb *in6p, int optname, const void *request, 1449 size_t len, kauth_cred_t cred) 1450 { 1451 const struct sadb_x_policy *xpl; 1452 struct secpolicy **policy; 1453 1454 /* sanity check. */ 1455 if (in6p == NULL || request == NULL) 1456 return EINVAL; 1457 if (len < sizeof(*xpl)) 1458 return EINVAL; 1459 xpl = (const struct sadb_x_policy *)request; 1460 1461 /* select direction */ 1462 switch (xpl->sadb_x_policy_dir) { 1463 case IPSEC_DIR_INBOUND: 1464 policy = &in6p->in6p_sp->sp_in; 1465 break; 1466 case IPSEC_DIR_OUTBOUND: 1467 policy = &in6p->in6p_sp->sp_out; 1468 break; 1469 default: 1470 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1471 xpl->sadb_x_policy_dir)); 1472 return EINVAL; 1473 } 1474 1475 return ipsec_set_policy(policy, optname, request, len, cred); 1476 } 1477 1478 int 1479 ipsec6_get_policy(struct in6pcb *in6p, const void *request, size_t len, 1480 struct mbuf **mp) 1481 { 1482 const struct sadb_x_policy *xpl; 1483 struct secpolicy *policy; 1484 1485 /* sanity check. */ 1486 if (in6p == NULL || request == NULL || mp == NULL) 1487 return EINVAL; 1488 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1489 if (len < sizeof(*xpl)) 1490 return EINVAL; 1491 xpl = (const struct sadb_x_policy *)request; 1492 1493 /* select direction */ 1494 switch (xpl->sadb_x_policy_dir) { 1495 case IPSEC_DIR_INBOUND: 1496 policy = in6p->in6p_sp->sp_in; 1497 break; 1498 case IPSEC_DIR_OUTBOUND: 1499 policy = in6p->in6p_sp->sp_out; 1500 break; 1501 default: 1502 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1503 xpl->sadb_x_policy_dir)); 1504 return EINVAL; 1505 } 1506 1507 return ipsec_get_policy(policy, mp); 1508 } 1509 1510 int 1511 ipsec6_delete_pcbpolicy(struct in6pcb *in6p) 1512 { 1513 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1514 1515 if (in6p->in6p_sp == NULL) 1516 return 0; 1517 1518 if (in6p->in6p_sp->sp_in != NULL) 1519 KEY_FREESP(&in6p->in6p_sp->sp_in); 1520 1521 if (in6p->in6p_sp->sp_out != NULL) 1522 KEY_FREESP(&in6p->in6p_sp->sp_out); 1523 1524 #ifdef __NetBSD 1525 ipsec_invalpcbcache(in6p->in6p_sp, IPSEC_DIR_ANY); 1526 #endif 1527 1528 ipsec_delpcbpolicy(in6p->in6p_sp); 1529 in6p->in6p_sp = NULL; 1530 1531 return 0; 1532 } 1533 #endif 1534 1535 /* 1536 * return current level. 1537 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1538 */ 1539 u_int 1540 ipsec_get_reqlevel(const struct ipsecrequest *isr) 1541 { 1542 u_int level = 0; 1543 u_int esp_trans_deflev, esp_net_deflev; 1544 u_int ah_trans_deflev, ah_net_deflev; 1545 1546 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1547 ("ipsec_get_reqlevel: null argument")); 1548 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1549 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1550 isr->sp->spidx.src.sa.sa_family, 1551 isr->sp->spidx.dst.sa.sa_family)); 1552 1553 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1554 #define IPSEC_CHECK_DEFAULT(lev) \ 1555 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1556 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1557 ? (ipsec_debug \ 1558 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1559 (lev), IPSEC_LEVEL_REQUIRE) \ 1560 : 0), \ 1561 (lev) = IPSEC_LEVEL_REQUIRE, \ 1562 (lev) \ 1563 : (lev)) 1564 1565 /* set default level */ 1566 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1567 #ifdef INET 1568 case AF_INET: 1569 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1570 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1571 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1572 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1573 break; 1574 #endif 1575 #ifdef INET6 1576 case AF_INET6: 1577 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1578 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1579 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1580 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1581 break; 1582 #endif /* INET6 */ 1583 default: 1584 panic("key_get_reqlevel: unknown af %u", 1585 isr->sp->spidx.src.sa.sa_family); 1586 } 1587 1588 #undef IPSEC_CHECK_DEFAULT 1589 1590 /* set level */ 1591 switch (isr->level) { 1592 case IPSEC_LEVEL_DEFAULT: 1593 switch (isr->saidx.proto) { 1594 case IPPROTO_ESP: 1595 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1596 level = esp_net_deflev; 1597 else 1598 level = esp_trans_deflev; 1599 break; 1600 case IPPROTO_AH: 1601 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1602 level = ah_net_deflev; 1603 else 1604 level = ah_trans_deflev; 1605 break; 1606 case IPPROTO_IPCOMP: 1607 /* 1608 * we don't really care, as IPcomp document says that 1609 * we shouldn't compress small packets 1610 */ 1611 level = IPSEC_LEVEL_USE; 1612 break; 1613 default: 1614 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1615 isr->saidx.proto); 1616 } 1617 break; 1618 1619 case IPSEC_LEVEL_USE: 1620 case IPSEC_LEVEL_REQUIRE: 1621 level = isr->level; 1622 break; 1623 case IPSEC_LEVEL_UNIQUE: 1624 level = IPSEC_LEVEL_REQUIRE; 1625 break; 1626 1627 default: 1628 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1629 isr->level); 1630 } 1631 1632 return level; 1633 } 1634 1635 /* 1636 * Check security policy requirements against the actual 1637 * packet contents. Return one if the packet should be 1638 * reject as "invalid"; otherwiser return zero to have the 1639 * packet treated as "valid". 1640 * 1641 * OUT: 1642 * 0: valid 1643 * 1: invalid 1644 */ 1645 int 1646 ipsec_in_reject(const struct secpolicy *sp, const struct mbuf *m) 1647 { 1648 struct ipsecrequest *isr; 1649 int need_auth; 1650 1651 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1652 printf("ipsec_in_reject: using SP\n"); 1653 kdebug_secpolicy(sp)); 1654 1655 /* check policy */ 1656 switch (sp->policy) { 1657 case IPSEC_POLICY_DISCARD: 1658 return 1; 1659 case IPSEC_POLICY_BYPASS: 1660 case IPSEC_POLICY_NONE: 1661 return 0; 1662 } 1663 1664 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1665 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1666 1667 /* XXX should compare policy against ipsec header history */ 1668 1669 need_auth = 0; 1670 for (isr = sp->req; isr != NULL; isr = isr->next) { 1671 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1672 continue; 1673 switch (isr->saidx.proto) { 1674 case IPPROTO_ESP: 1675 if ((m->m_flags & M_DECRYPTED) == 0) { 1676 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1677 printf("ipsec_in_reject: ESP m_flags:%x\n", 1678 m->m_flags)); 1679 return 1; 1680 } 1681 1682 if (!need_auth && 1683 isr->sav != NULL && 1684 isr->sav->tdb_authalgxform != NULL && 1685 (m->m_flags & M_AUTHIPDGM) == 0) { 1686 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1687 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1688 m->m_flags)); 1689 return 1; 1690 } 1691 break; 1692 case IPPROTO_AH: 1693 need_auth = 1; 1694 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1695 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1696 printf("ipsec_in_reject: AH m_flags:%x\n", 1697 m->m_flags)); 1698 return 1; 1699 } 1700 break; 1701 case IPPROTO_IPCOMP: 1702 /* 1703 * we don't really care, as IPcomp document 1704 * says that we shouldn't compress small 1705 * packets, IPComp policy should always be 1706 * treated as being in "use" level. 1707 */ 1708 break; 1709 } 1710 } 1711 return 0; /* valid */ 1712 } 1713 1714 /* 1715 * Check AH/ESP integrity. 1716 * This function is called from tcp_input(), udp_input(), 1717 * and {ah,esp}4_input for tunnel mode 1718 */ 1719 int 1720 ipsec4_in_reject(struct mbuf *m, struct inpcb *inp) 1721 { 1722 struct secpolicy *sp; 1723 int error; 1724 int result; 1725 1726 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1727 1728 /* get SP for this packet. 1729 * When we are called from ip_forward(), we call 1730 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1731 */ 1732 if (inp == NULL) 1733 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1734 else 1735 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1736 IN4PCB_TO_PCB(inp), &error); 1737 1738 if (sp != NULL) { 1739 result = ipsec_in_reject(sp, m); 1740 if (result) 1741 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 1742 KEY_FREESP(&sp); 1743 } else { 1744 result = 0; /* XXX should be panic ? 1745 * -> No, there may be error. */ 1746 } 1747 return result; 1748 } 1749 1750 1751 #ifdef INET6 1752 /* 1753 * Check AH/ESP integrity. 1754 * This function is called from tcp6_input(), udp6_input(), 1755 * and {ah,esp}6_input for tunnel mode 1756 */ 1757 int 1758 ipsec6_in_reject(struct mbuf *m, struct in6pcb *in6p) 1759 { 1760 struct secpolicy *sp = NULL; 1761 int error; 1762 int result; 1763 1764 /* sanity check */ 1765 if (m == NULL) 1766 return 0; /* XXX should be panic ? */ 1767 1768 /* get SP for this packet. 1769 * When we are called from ip_forward(), we call 1770 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1771 */ 1772 if (in6p == NULL) 1773 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1774 else 1775 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1776 IN6PCB_TO_PCB(in6p), 1777 &error); 1778 1779 if (sp != NULL) { 1780 result = ipsec_in_reject(sp, m); 1781 if (result) 1782 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 1783 KEY_FREESP(&sp); 1784 } else { 1785 result = 0; 1786 } 1787 return result; 1788 } 1789 #endif 1790 1791 /* 1792 * compute the byte size to be occupied by IPsec header. 1793 * in case it is tunneled, it includes the size of outer IP header. 1794 * NOTE: SP passed is free in this function. 1795 */ 1796 static size_t 1797 ipsec_hdrsiz(const struct secpolicy *sp) 1798 { 1799 const struct ipsecrequest *isr; 1800 size_t siz; 1801 1802 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1803 printf("ipsec_hdrsiz: using SP\n"); 1804 kdebug_secpolicy(sp)); 1805 1806 switch (sp->policy) { 1807 case IPSEC_POLICY_DISCARD: 1808 case IPSEC_POLICY_BYPASS: 1809 case IPSEC_POLICY_NONE: 1810 return 0; 1811 } 1812 1813 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1814 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1815 1816 siz = 0; 1817 for (isr = sp->req; isr != NULL; isr = isr->next) { 1818 size_t clen = 0; 1819 1820 switch (isr->saidx.proto) { 1821 case IPPROTO_ESP: 1822 clen = esp_hdrsiz(isr->sav); 1823 break; 1824 case IPPROTO_AH: 1825 clen = ah_hdrsiz(isr->sav); 1826 break; 1827 case IPPROTO_IPCOMP: 1828 clen = sizeof(struct ipcomp); 1829 break; 1830 } 1831 1832 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1833 switch (isr->saidx.dst.sa.sa_family) { 1834 case AF_INET: 1835 clen += sizeof(struct ip); 1836 break; 1837 #ifdef INET6 1838 case AF_INET6: 1839 clen += sizeof(struct ip6_hdr); 1840 break; 1841 #endif 1842 default: 1843 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1844 "unknown AF %d in IPsec tunnel SA\n", 1845 ((const struct sockaddr *)&isr->saidx.dst)->sa_family)); 1846 break; 1847 } 1848 } 1849 siz += clen; 1850 } 1851 1852 return siz; 1853 } 1854 1855 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1856 size_t 1857 ipsec4_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp) 1858 { 1859 struct secpolicy *sp; 1860 int error; 1861 size_t size; 1862 1863 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1864 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1865 ("ipsec4_hdrsize: socket w/o inpcb")); 1866 1867 /* get SP for this packet. 1868 * When we are called from ip_forward(), we call 1869 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1870 */ 1871 if (inp == NULL) 1872 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1873 else 1874 sp = ipsec_getpolicybysock(m, dir, 1875 IN4PCB_TO_PCB(inp), &error); 1876 1877 if (sp != NULL) { 1878 size = ipsec_hdrsiz(sp); 1879 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1880 printf("ipsec4_hdrsiz: size:%lu.\n", 1881 (unsigned long)size)); 1882 1883 KEY_FREESP(&sp); 1884 } else { 1885 size = 0; /* XXX should be panic ? */ 1886 } 1887 return size; 1888 } 1889 1890 #ifdef INET6 1891 /* This function is called from ipsec6_hdrsize_tcp(), 1892 * and maybe from ip6_forward.() 1893 */ 1894 size_t 1895 ipsec6_hdrsiz(struct mbuf *m, u_int dir, struct in6pcb *in6p) 1896 { 1897 struct secpolicy *sp; 1898 int error; 1899 size_t size; 1900 1901 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1902 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1903 ("ipsec6_hdrsize: socket w/o inpcb")); 1904 1905 /* get SP for this packet */ 1906 /* XXX Is it right to call with IP_FORWARDING. */ 1907 if (in6p == NULL) 1908 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1909 else 1910 sp = ipsec_getpolicybysock(m, dir, 1911 IN6PCB_TO_PCB(in6p), 1912 &error); 1913 1914 if (sp == NULL) 1915 return 0; 1916 size = ipsec_hdrsiz(sp); 1917 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1918 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1919 KEY_FREESP(&sp); 1920 1921 return size; 1922 } 1923 #endif /*INET6*/ 1924 1925 /* 1926 * Check the variable replay window. 1927 * ipsec_chkreplay() performs replay check before ICV verification. 1928 * ipsec_updatereplay() updates replay bitmap. This must be called after 1929 * ICV verification (it also performs replay check, which is usually done 1930 * beforehand). 1931 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1932 * 1933 * based on RFC 2401. 1934 */ 1935 int 1936 ipsec_chkreplay(u_int32_t seq, const struct secasvar *sav) 1937 { 1938 const struct secreplay *replay; 1939 u_int32_t diff; 1940 int fr; 1941 u_int32_t wsizeb; /* constant: bits of window size */ 1942 int frlast; /* constant: last frame */ 1943 1944 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 1945 1946 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1947 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1948 1949 replay = sav->replay; 1950 1951 if (replay->wsize == 0) 1952 return 1; /* no need to check replay. */ 1953 1954 /* constant */ 1955 frlast = replay->wsize - 1; 1956 wsizeb = replay->wsize << 3; 1957 1958 /* sequence number of 0 is invalid */ 1959 if (seq == 0) 1960 return 0; 1961 1962 /* first time is always okay */ 1963 if (replay->count == 0) 1964 return 1; 1965 1966 if (seq > replay->lastseq) { 1967 /* larger sequences are okay */ 1968 return 1; 1969 } else { 1970 /* seq is equal or less than lastseq. */ 1971 diff = replay->lastseq - seq; 1972 1973 /* over range to check, i.e. too old or wrapped */ 1974 if (diff >= wsizeb) 1975 return 0; 1976 1977 fr = frlast - diff / 8; 1978 1979 /* this packet already seen ? */ 1980 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1981 return 0; 1982 1983 /* out of order but good */ 1984 return 1; 1985 } 1986 } 1987 1988 /* 1989 * check replay counter whether to update or not. 1990 * OUT: 0: OK 1991 * 1: NG 1992 */ 1993 int 1994 ipsec_updatereplay(u_int32_t seq, const struct secasvar *sav) 1995 { 1996 struct secreplay *replay; 1997 u_int32_t diff; 1998 int fr; 1999 u_int32_t wsizeb; /* constant: bits of window size */ 2000 int frlast; /* constant: last frame */ 2001 2002 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 2003 2004 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 2005 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 2006 2007 replay = sav->replay; 2008 2009 if (replay->wsize == 0) 2010 goto ok; /* no need to check replay. */ 2011 2012 /* constant */ 2013 frlast = replay->wsize - 1; 2014 wsizeb = replay->wsize << 3; 2015 2016 /* sequence number of 0 is invalid */ 2017 if (seq == 0) 2018 return 1; 2019 2020 /* first time */ 2021 if (replay->count == 0) { 2022 replay->lastseq = seq; 2023 memset(replay->bitmap, 0, replay->wsize); 2024 (replay->bitmap)[frlast] = 1; 2025 goto ok; 2026 } 2027 2028 if (seq > replay->lastseq) { 2029 /* seq is larger than lastseq. */ 2030 diff = seq - replay->lastseq; 2031 2032 /* new larger sequence number */ 2033 if (diff < wsizeb) { 2034 /* In window */ 2035 /* set bit for this packet */ 2036 vshiftl(replay->bitmap, diff, replay->wsize); 2037 (replay->bitmap)[frlast] |= 1; 2038 } else { 2039 /* this packet has a "way larger" */ 2040 memset(replay->bitmap, 0, replay->wsize); 2041 (replay->bitmap)[frlast] = 1; 2042 } 2043 replay->lastseq = seq; 2044 2045 /* larger is good */ 2046 } else { 2047 /* seq is equal or less than lastseq. */ 2048 diff = replay->lastseq - seq; 2049 2050 /* over range to check, i.e. too old or wrapped */ 2051 if (diff >= wsizeb) 2052 return 1; 2053 2054 fr = frlast - diff / 8; 2055 2056 /* this packet already seen ? */ 2057 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2058 return 1; 2059 2060 /* mark as seen */ 2061 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2062 2063 /* out of order but good */ 2064 } 2065 2066 ok: 2067 if (replay->count == ~0) { 2068 2069 /* set overflow flag */ 2070 replay->overflow++; 2071 2072 /* don't increment, no more packets accepted */ 2073 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2074 return 1; 2075 2076 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2077 replay->overflow, ipsec_logsastr(sav))); 2078 } 2079 2080 replay->count++; 2081 2082 return 0; 2083 } 2084 2085 /* 2086 * shift variable length bunffer to left. 2087 * IN: bitmap: pointer to the buffer 2088 * nbit: the number of to shift. 2089 * wsize: buffer size (bytes). 2090 */ 2091 static void 2092 vshiftl(unsigned char *bitmap, int nbit, int wsize) 2093 { 2094 int s, j, i; 2095 unsigned char over; 2096 2097 for (j = 0; j < nbit; j += 8) { 2098 s = (nbit - j < 8) ? (nbit - j): 8; 2099 bitmap[0] <<= s; 2100 for (i = 1; i < wsize; i++) { 2101 over = (bitmap[i] >> (8 - s)); 2102 bitmap[i] <<= s; 2103 bitmap[i-1] |= over; 2104 } 2105 } 2106 2107 return; 2108 } 2109 2110 /* Return a printable string for the IPv4 address. */ 2111 static char * 2112 inet_ntoa4(struct in_addr ina) 2113 { 2114 static char buf[4][4 * sizeof "123" + 4]; 2115 unsigned char *ucp = (unsigned char *) &ina; 2116 static int i = 3; 2117 2118 i = (i + 1) % 4; 2119 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2120 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2121 return (buf[i]); 2122 } 2123 2124 /* Return a printable string for the address. */ 2125 const char * 2126 ipsec_address(const union sockaddr_union *sa) 2127 { 2128 switch (sa->sa.sa_family) { 2129 #if INET 2130 case AF_INET: 2131 return inet_ntoa4(sa->sin.sin_addr); 2132 #endif /* INET */ 2133 2134 #if INET6 2135 case AF_INET6: 2136 return ip6_sprintf(&sa->sin6.sin6_addr); 2137 #endif /* INET6 */ 2138 2139 default: 2140 return "(unknown address family)"; 2141 } 2142 } 2143 2144 const char * 2145 ipsec_logsastr(const struct secasvar *sav) 2146 { 2147 static char buf[256]; 2148 char *p; 2149 const struct secasindex *saidx = &sav->sah->saidx; 2150 2151 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2152 ("ipsec_logsastr: address family mismatch")); 2153 2154 p = buf; 2155 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2156 while (p && *p) 2157 p++; 2158 /* NB: only use ipsec_address on one address at a time */ 2159 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2160 ipsec_address(&saidx->src)); 2161 while (p && *p) 2162 p++; 2163 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2164 ipsec_address(&saidx->dst)); 2165 2166 return buf; 2167 } 2168 2169 void 2170 ipsec_dumpmbuf(struct mbuf *m) 2171 { 2172 int totlen; 2173 int i; 2174 u_char *p; 2175 2176 totlen = 0; 2177 printf("---\n"); 2178 while (m) { 2179 p = mtod(m, u_char *); 2180 for (i = 0; i < m->m_len; i++) { 2181 printf("%02x ", p[i]); 2182 totlen++; 2183 if (totlen % 16 == 0) 2184 printf("\n"); 2185 } 2186 m = m->m_next; 2187 } 2188 if (totlen % 16 != 0) 2189 printf("\n"); 2190 printf("---\n"); 2191 } 2192 2193 #ifdef INET6 2194 struct secpolicy * 2195 ipsec6_check_policy(struct mbuf *m, const struct socket *so, 2196 int flags, int *needipsecp, int *errorp) 2197 { 2198 struct in6pcb *in6p = NULL; 2199 struct secpolicy *sp = NULL; 2200 int s; 2201 int error = 0; 2202 int needipsec = 0; 2203 2204 if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6) 2205 in6p = sotoin6pcb(so); 2206 2207 if (!ipsec_outdone(m)) { 2208 s = splsoftnet(); 2209 if (in6p != NULL && 2210 IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) { 2211 splx(s); 2212 goto skippolicycheck; 2213 } 2214 sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p); 2215 2216 /* 2217 * There are four return cases: 2218 * sp != NULL apply IPsec policy 2219 * sp == NULL, error == 0 no IPsec handling needed 2220 * sp == NULL, error == -EINVAL discard packet w/o error 2221 * sp == NULL, error != 0 discard packet, report error 2222 */ 2223 2224 splx(s); 2225 if (sp == NULL) { 2226 /* 2227 * Caller must check the error return to see if it needs to discard 2228 * the packet. 2229 */ 2230 needipsec = 0; 2231 } else { 2232 needipsec = 1; 2233 } 2234 } 2235 skippolicycheck:; 2236 2237 *errorp = error; 2238 *needipsecp = needipsec; 2239 return sp; 2240 } 2241 #endif 2242 2243 2244 2245 /* XXX this stuff doesn't belong here... */ 2246 2247 static struct xformsw *xforms = NULL; 2248 2249 /* 2250 * Register a transform; typically at system startup. 2251 */ 2252 void 2253 xform_register(struct xformsw *xsp) 2254 { 2255 xsp->xf_next = xforms; 2256 xforms = xsp; 2257 } 2258 2259 /* 2260 * Initialize transform support in an sav. 2261 */ 2262 int 2263 xform_init(struct secasvar *sav, int xftype) 2264 { 2265 struct xformsw *xsp; 2266 2267 if (sav->tdb_xform != NULL) /* previously initialized */ 2268 return 0; 2269 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2270 if (xsp->xf_type == xftype) 2271 return (*xsp->xf_init)(sav, xsp); 2272 2273 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2274 return EINVAL; 2275 } 2276 2277 #ifdef __NetBSD__ 2278 /* 2279 * XXXJRT This should be done as a protosw init call. 2280 */ 2281 void 2282 ipsec_attach(void) 2283 { 2284 2285 ipsecstat_percpu = percpu_alloc(sizeof(uint64_t) * IPSEC_NSTATS); 2286 2287 ah_attach(); 2288 esp_attach(); 2289 ipcomp_attach(); 2290 ipe4_attach(); 2291 #ifdef TCP_SIGNATURE 2292 tcpsignature_attach(); 2293 #endif 2294 } 2295 #endif /* __NetBSD__ */ 2296