ipsec.c revision 1.30
1 /* $NetBSD: ipsec.c,v 1.30 2007/03/25 22:06:33 degroote 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 1.30 2007/03/25 22:06:33 degroote 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 62 #include <net/if.h> 63 #include <net/route.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #include <netinet/ip.h> 68 #include <netinet/ip_var.h> 69 #include <netinet/in_var.h> 70 #include <netinet/udp.h> 71 #include <netinet/udp_var.h> 72 #include <netinet/tcp.h> 73 #include <netinet/udp.h> 74 75 #include <netinet/ip6.h> 76 #ifdef INET6 77 #include <netinet6/ip6_var.h> 78 #endif 79 #include <netinet/in_pcb.h> 80 #ifdef INET6 81 #include <netinet6/in6_pcb.h> 82 #include <netinet/icmp6.h> 83 #endif 84 85 #include <netipsec/ipsec.h> 86 #include <netipsec/ipsec_var.h> 87 #ifdef INET6 88 #include <netipsec/ipsec6.h> 89 #endif 90 #include <netipsec/ah_var.h> 91 #include <netipsec/esp_var.h> 92 #include <netipsec/ipcomp.h> /*XXX*/ 93 #include <netipsec/ipcomp_var.h> 94 95 #include <netipsec/key.h> 96 #include <netipsec/keydb.h> 97 #include <netipsec/key_debug.h> 98 99 #include <netipsec/xform.h> 100 101 #include <netipsec/ipsec_osdep.h> 102 103 #include <net/net_osdep.h> 104 105 #ifdef IPSEC_DEBUG 106 int ipsec_debug = 1; 107 108 /* 109 * When set to 1, IPsec will send packets with the same sequence number. 110 * This allows to verify if the other side has proper replay attacks detection. 111 */ 112 int ipsec_replay = 0; 113 114 /* 115 * When set 1, IPsec will send packets with corrupted HMAC. 116 * This allows to verify if the other side properly detects modified packets. 117 */ 118 int ipsec_integrity = 0; 119 #else 120 int ipsec_debug = 0; 121 #endif 122 123 /* NB: name changed so netstat doesn't use it */ 124 struct newipsecstat newipsecstat; 125 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 126 int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */ 127 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 128 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 129 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 130 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 131 struct secpolicy ip4_def_policy; 132 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 133 int ip4_esp_randpad = -1; 134 135 #ifdef __NetBSD__ 136 u_int ipsec_spdgen = 1; /* SPD generation # */ 137 138 static struct secpolicy *ipsec_checkpcbcache __P((struct mbuf *, 139 struct inpcbpolicy *, int)); 140 static int ipsec_fillpcbcache __P((struct inpcbpolicy *, struct mbuf *, 141 struct secpolicy *, int)); 142 static int ipsec_invalpcbcache __P((struct inpcbpolicy *, int)); 143 #endif /* __NetBSD__ */ 144 145 /* 146 * Crypto support requirements: 147 * 148 * 1 require hardware support 149 * -1 require software support 150 * 0 take anything 151 */ 152 int crypto_support = 0; 153 154 static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int, 155 PCB_T *, int *); 156 157 #ifdef __FreeBSD__ 158 SYSCTL_DECL(_net_inet_ipsec); 159 160 /* net.inet.ipsec */ 161 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 162 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 163 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 164 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 165 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 166 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 167 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 168 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 169 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 170 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 171 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 172 ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, ""); 173 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 174 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 175 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 176 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 177 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 178 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 179 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 180 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 181 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 182 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 183 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 184 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 185 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 186 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 187 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, 188 "Emulate replay attack"); 189 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, 190 &ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 191 #endif /* __FreeBSD__ */ 192 193 #ifdef INET6 194 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 195 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 196 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 197 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 198 struct secpolicy ip6_def_policy; 199 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 200 int ip6_esp_randpad = -1; 201 202 203 #ifdef __FreeBSD__ 204 SYSCTL_DECL(_net_inet6_ipsec6); 205 206 /* net.inet6.ipsec6 */ 207 #ifdef COMPAT_KAME 208 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 209 0,0, compat_ipsecstats_sysctl, "S", ""); 210 #endif /* COMPAT_KAME */ 211 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 212 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 213 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 214 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 215 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 216 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 217 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 218 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 219 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 220 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 221 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 222 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 223 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 224 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 225 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 226 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 227 #endif /* INET6 */ 228 #endif /* __FreeBSD__ */ 229 230 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 231 #ifdef INET6 232 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 233 #endif 234 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 235 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 236 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 237 #ifdef INET6 238 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 239 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 240 #endif 241 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 242 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 243 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 244 int optname, void *request, size_t len, int priv)); 245 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 246 static void vshiftl __P((unsigned char *, int, int)); 247 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 248 249 #ifdef __NetBSD__ 250 /* 251 * Try to validate and use cached policy on a PCB. 252 */ 253 static struct secpolicy * 254 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir) 255 { 256 struct secpolicyindex spidx; 257 258 switch (dir) { 259 case IPSEC_DIR_INBOUND: 260 case IPSEC_DIR_OUTBOUND: 261 case IPSEC_DIR_ANY: 262 break; 263 default: 264 return NULL; 265 } 266 #ifdef DIAGNOSTIC 267 if (pcbsp == NULL) { 268 printf("ipsec_checkpcbcache: NULL pcbsp\n"); 269 /* XXX panic? */ 270 return NULL; 271 } 272 #endif 273 274 #ifdef DIAGNOSTIC 275 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 276 panic("dir too big in ipsec_checkpcbcache"); 277 #endif 278 /* SPD table change invalidate all the caches. */ 279 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) { 280 ipsec_invalpcbcache(pcbsp, dir); 281 return NULL; 282 } 283 if (!pcbsp->sp_cache[dir].cachesp) 284 return NULL; 285 if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) { 286 ipsec_invalpcbcache(pcbsp, dir); 287 return NULL; 288 } 289 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) { 290 if (!pcbsp->sp_cache[dir].cachesp) 291 return NULL; 292 if (ipsec_setspidx(m, &spidx, 1) != 0) 293 return NULL; 294 295 /* 296 * We have to make an exact match here since the cached rule 297 * might have lower priority than a rule that would otherwise 298 * have matched the packet. 299 */ 300 301 if (bcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, sizeof(spidx))) 302 return NULL; 303 304 } else { 305 /* 306 * The pcb is connected, and the L4 code is sure that: 307 * - outgoing side uses inp_[lf]addr 308 * - incoming side looks up policy after inpcb lookup 309 * and address pair is know to be stable. We do not need 310 * to generate spidx again, nor check the address match again. 311 * 312 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 313 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 314 */ 315 } 316 317 pcbsp->sp_cache[dir].cachesp->lastused = time_second; 318 pcbsp->sp_cache[dir].cachesp->refcnt++; 319 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 320 printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n", 321 pcbsp->sp_cache[dir].cachesp->refcnt, 322 pcbsp->sp_cache[dir].cachesp)); 323 return pcbsp->sp_cache[dir].cachesp; 324 } 325 326 static int 327 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 328 struct secpolicy *sp, int dir) 329 { 330 331 switch (dir) { 332 case IPSEC_DIR_INBOUND: 333 case IPSEC_DIR_OUTBOUND: 334 break; 335 default: 336 return EINVAL; 337 } 338 #ifdef DIAGNOSTIC 339 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 340 panic("dir too big in ipsec_fillpcbcache"); 341 #endif 342 343 if (pcbsp->sp_cache[dir].cachesp) 344 KEY_FREESP(&pcbsp->sp_cache[dir].cachesp); 345 pcbsp->sp_cache[dir].cachesp = NULL; 346 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE; 347 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 348 return EINVAL; 349 } 350 pcbsp->sp_cache[dir].cachesp = sp; 351 if (pcbsp->sp_cache[dir].cachesp) { 352 pcbsp->sp_cache[dir].cachesp->refcnt++; 353 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 354 printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n", 355 pcbsp->sp_cache[dir].cachesp->refcnt, 356 pcbsp->sp_cache[dir].cachesp)); 357 358 /* 359 * If the PCB is connected, we can remember a hint to 360 * possibly short-circuit IPsec processing in other places. 361 */ 362 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 363 switch (pcbsp->sp_cache[dir].cachesp->policy) { 364 case IPSEC_POLICY_NONE: 365 case IPSEC_POLICY_BYPASS: 366 pcbsp->sp_cache[dir].cachehint = 367 IPSEC_PCBHINT_NO; 368 break; 369 default: 370 pcbsp->sp_cache[dir].cachehint = 371 IPSEC_PCBHINT_YES; 372 } 373 } 374 } 375 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 376 377 return 0; 378 } 379 380 static int 381 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 382 { 383 int i; 384 385 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 386 if (dir != IPSEC_DIR_ANY && i != dir) 387 continue; 388 if (pcbsp->sp_cache[i].cachesp) 389 KEY_FREESP(&pcbsp->sp_cache[i].cachesp); 390 pcbsp->sp_cache[i].cachesp = NULL; 391 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE; 392 pcbsp->sp_cache[i].cachegen = 0; 393 bzero(&pcbsp->sp_cache[i].cacheidx, 394 sizeof(pcbsp->sp_cache[i].cacheidx)); 395 } 396 return 0; 397 } 398 399 void 400 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 401 { 402 403 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 404 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 405 } 406 407 void 408 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 409 { 410 411 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 412 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 413 } 414 415 void 416 ipsec_invalpcbcacheall(void) 417 { 418 419 if (ipsec_spdgen == UINT_MAX) 420 ipsec_spdgen = 1; 421 else 422 ipsec_spdgen++; 423 } 424 #endif /* __NetBSD__ */ 425 426 /* 427 * Return a held reference to the default SP. 428 */ 429 static struct secpolicy * 430 key_allocsp_default(const char* where, int tag) 431 { 432 struct secpolicy *sp; 433 434 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 435 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 436 437 sp = &ip4_def_policy; 438 if (sp->policy != IPSEC_POLICY_DISCARD && 439 sp->policy != IPSEC_POLICY_NONE) { 440 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 441 sp->policy, IPSEC_POLICY_NONE)); 442 sp->policy = IPSEC_POLICY_NONE; 443 } 444 sp->refcnt++; 445 446 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 447 printf("DP key_allocsp_default returns SP:%p (%u)\n", 448 sp, sp->refcnt)); 449 return sp; 450 } 451 #define KEY_ALLOCSP_DEFAULT() \ 452 key_allocsp_default(__FILE__, __LINE__) 453 454 /* 455 * For OUTBOUND packet having a socket. Searching SPD for packet, 456 * and return a pointer to SP. 457 * OUT: NULL: no apropreate SP found, the following value is set to error. 458 * 0 : bypass 459 * EACCES : discard packet. 460 * ENOENT : ipsec_acquire() in progress, maybe. 461 * others : error occurred. 462 * others: a pointer to SP 463 * 464 * NOTE: IPv6 mapped address concern is implemented here. 465 */ 466 struct secpolicy * 467 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 468 { 469 struct secpolicy *sp; 470 471 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 472 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 473 ("ipsec_getpolicy: invalid direction %u", dir)); 474 475 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 476 if (sp == NULL) /*XXX????*/ 477 sp = KEY_ALLOCSP_DEFAULT(); 478 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 479 return sp; 480 } 481 482 /* 483 * For OUTBOUND packet having a socket. Searching SPD for packet, 484 * and return a pointer to SP. 485 * OUT: NULL: no apropreate SP found, the following value is set to error. 486 * 0 : bypass 487 * EACCES : discard packet. 488 * ENOENT : ipsec_acquire() in progress, maybe. 489 * others : error occurred. 490 * others: a pointer to SP 491 * 492 * NOTE: IPv6 mapped address concern is implemented here. 493 */ 494 static struct secpolicy * 495 ipsec_getpolicybysock(m, dir, inp, error) 496 struct mbuf *m; 497 u_int dir; 498 PCB_T *inp; 499 int *error; 500 { 501 struct inpcbpolicy *pcbsp = NULL; 502 struct secpolicy *currsp = NULL; /* policy on socket */ 503 struct secpolicy *sp; 504 int af; 505 506 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 507 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 508 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 509 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 510 ("ipsec_getpolicybysock: invalid direction %u", dir)); 511 512 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, 513 ("ipsec_getppolicybysock: null socket\n")); 514 515 /* XXX FIXME inpcb/in6pcb vs socket*/ 516 af = PCB_FAMILY(inp); 517 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 518 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 519 520 #ifdef __NetBSD__ 521 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache")); 522 /* If we have a cached entry, and if it is still valid, use it. */ 523 ipsecstat.ips_spdcache_lookup++; 524 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); 525 if (currsp) { 526 *error = 0; 527 return currsp; 528 } 529 ipsecstat.ips_spdcache_miss++; 530 #endif /* __NetBSD__ */ 531 532 switch (af) { 533 case AF_INET: { 534 struct inpcb *in4p = PCB_TO_IN4PCB(inp); 535 /* set spidx in pcb */ 536 *error = ipsec4_setspidx_inpcb(m, in4p); 537 pcbsp = in4p->inp_sp; 538 break; 539 } 540 541 #if defined(INET6) 542 case AF_INET6: { 543 struct in6pcb *in6p = PCB_TO_IN6PCB(inp); 544 /* set spidx in pcb */ 545 *error = ipsec6_setspidx_in6pcb(m, in6p); 546 pcbsp = in6p->in6p_sp; 547 break; 548 } 549 #endif 550 default: 551 *error = EPFNOSUPPORT; 552 break; 553 } 554 if (*error) 555 return NULL; 556 557 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 558 switch (dir) { 559 case IPSEC_DIR_INBOUND: 560 currsp = pcbsp->sp_in; 561 break; 562 case IPSEC_DIR_OUTBOUND: 563 currsp = pcbsp->sp_out; 564 break; 565 } 566 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 567 568 if (pcbsp->priv) { /* when privilieged socket */ 569 switch (currsp->policy) { 570 case IPSEC_POLICY_BYPASS: 571 case IPSEC_POLICY_IPSEC: 572 currsp->refcnt++; 573 sp = currsp; 574 break; 575 576 case IPSEC_POLICY_ENTRUST: 577 /* look for a policy in SPD */ 578 sp = KEY_ALLOCSP(&currsp->spidx, dir); 579 if (sp == NULL) /* no SP found */ 580 sp = KEY_ALLOCSP_DEFAULT(); 581 break; 582 583 default: 584 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 585 "Invalid policy for PCB %d\n", currsp->policy)); 586 *error = EINVAL; 587 return NULL; 588 } 589 } else { /* unpriv, SPD has policy */ 590 sp = KEY_ALLOCSP(&currsp->spidx, dir); 591 if (sp == NULL) { /* no SP found */ 592 switch (currsp->policy) { 593 case IPSEC_POLICY_BYPASS: 594 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 595 "Illegal policy for non-priviliged defined %d\n", 596 currsp->policy)); 597 *error = EINVAL; 598 return NULL; 599 600 case IPSEC_POLICY_ENTRUST: 601 sp = KEY_ALLOCSP_DEFAULT(); 602 break; 603 604 case IPSEC_POLICY_IPSEC: 605 currsp->refcnt++; 606 sp = currsp; 607 break; 608 609 default: 610 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 611 "Invalid policy for PCB %d\n", currsp->policy)); 612 *error = EINVAL; 613 return NULL; 614 } 615 } 616 } 617 IPSEC_ASSERT(sp != NULL, 618 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 619 pcbsp->priv, currsp->policy)); 620 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 621 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 622 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 623 sp, sp->refcnt)); 624 #ifdef __NetBSD__ 625 ipsec_fillpcbcache(pcbsp, m, sp, dir); 626 #endif /* __NetBSD__ */ 627 return sp; 628 } 629 630 /* 631 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 632 * and return a pointer to SP. 633 * OUT: positive: a pointer to the entry for security policy leaf matched. 634 * NULL: no apropreate SP found, the following value is set to error. 635 * 0 : bypass 636 * EACCES : discard packet. 637 * ENOENT : ipsec_acquire() in progress, maybe. 638 * others : error occurred. 639 */ 640 struct secpolicy * 641 ipsec_getpolicybyaddr(m, dir, flag, error) 642 struct mbuf *m; 643 u_int dir; 644 int flag; 645 int *error; 646 { 647 struct secpolicyindex spidx; 648 struct secpolicy *sp; 649 650 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 651 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 652 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 653 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 654 655 sp = NULL; 656 if (key_havesp(dir)) { 657 /* Make an index to look for a policy. */ 658 *error = ipsec_setspidx(m, &spidx, 659 (flag & IP_FORWARDING) ? 0 : 1); 660 if (*error != 0) { 661 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 662 " dir %u flag %u\n", dir, flag)); 663 bzero(&spidx, sizeof (spidx)); 664 return NULL; 665 } 666 spidx.dir = dir; 667 668 sp = KEY_ALLOCSP(&spidx, dir); 669 } 670 if (sp == NULL) /* no SP found, use system default */ 671 sp = KEY_ALLOCSP_DEFAULT(); 672 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 673 return sp; 674 } 675 676 struct secpolicy * 677 ipsec4_checkpolicy(m, dir, flag, error, inp) 678 struct mbuf *m; 679 u_int dir, flag; 680 int *error; 681 struct inpcb *inp; 682 { 683 struct secpolicy *sp; 684 685 *error = 0; 686 687 688 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 689 if (inp == NULL || inp->inp_socket == NULL) { 690 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 691 } else 692 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); 693 if (sp == NULL) { 694 IPSEC_ASSERT(*error != 0, 695 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 696 newipsecstat.ips_out_inval++; 697 return NULL; 698 } 699 IPSEC_ASSERT(*error == 0, 700 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 701 switch (sp->policy) { 702 case IPSEC_POLICY_ENTRUST: 703 default: 704 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 705 /* fall thru... */ 706 case IPSEC_POLICY_DISCARD: 707 newipsecstat.ips_out_polvio++; 708 *error = -EINVAL; /* packet is discarded by caller */ 709 break; 710 case IPSEC_POLICY_BYPASS: 711 case IPSEC_POLICY_NONE: 712 KEY_FREESP(&sp); 713 sp = NULL; /* NB: force NULL result */ 714 break; 715 case IPSEC_POLICY_IPSEC: 716 if (sp->req == NULL) /* acquire an SA */ 717 *error = key_spdacquire(sp); 718 break; 719 } 720 if (*error != 0) { 721 KEY_FREESP(&sp); 722 sp = NULL; 723 } 724 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 725 return sp; 726 } 727 728 #ifdef INET6 729 struct secpolicy * 730 ipsec6_checkpolicy(m, dir, flag, error, in6p) 731 struct mbuf *m; 732 u_int dir, flag; 733 int *error; 734 struct in6pcb *in6p; 735 { 736 struct secpolicy *sp; 737 738 *error = 0; 739 740 741 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 742 if (in6p == NULL || in6p->in6p_socket == NULL) { 743 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 744 } else 745 sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error); 746 if (sp == NULL) { 747 IPSEC_ASSERT(*error != 0, 748 ("ipsec6_checkpolicy: getpolicy failed w/o error")); 749 newipsecstat.ips_out_inval++; 750 return NULL; 751 } 752 IPSEC_ASSERT(*error == 0, 753 ("ipsec6_checkpolicy: sp w/ error set to %u", *error)); 754 switch (sp->policy) { 755 case IPSEC_POLICY_ENTRUST: 756 default: 757 printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy); 758 /* fall thru... */ 759 case IPSEC_POLICY_DISCARD: 760 newipsecstat.ips_out_polvio++; 761 *error = -EINVAL; /* packet is discarded by caller */ 762 break; 763 case IPSEC_POLICY_BYPASS: 764 case IPSEC_POLICY_NONE: 765 KEY_FREESP(&sp); 766 sp = NULL; /* NB: force NULL result */ 767 break; 768 case IPSEC_POLICY_IPSEC: 769 if (sp->req == NULL) /* acquire an SA */ 770 *error = key_spdacquire(sp); 771 break; 772 } 773 if (*error != 0) { 774 KEY_FREESP(&sp); 775 sp = NULL; 776 } 777 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 778 return sp; 779 } 780 #endif /* INET6 */ 781 782 static int 783 ipsec4_setspidx_inpcb(m, pcb) 784 struct mbuf *m; 785 struct inpcb *pcb; 786 { 787 int error; 788 789 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 790 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 791 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 792 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 793 794 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 795 if (error == 0) { 796 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 797 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 798 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 799 } else { 800 bzero(&pcb->inp_sp->sp_in->spidx, 801 sizeof (pcb->inp_sp->sp_in->spidx)); 802 bzero(&pcb->inp_sp->sp_out->spidx, 803 sizeof (pcb->inp_sp->sp_in->spidx)); 804 } 805 return error; 806 } 807 808 #ifdef INET6 809 static int 810 ipsec6_setspidx_in6pcb(m, pcb) 811 struct mbuf *m; 812 struct in6pcb *pcb; 813 { 814 struct secpolicyindex *spidx; 815 int error; 816 817 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 818 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 819 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 820 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 821 822 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 823 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 824 825 spidx = &pcb->in6p_sp->sp_in->spidx; 826 error = ipsec_setspidx(m, spidx, 1); 827 if (error) 828 goto bad; 829 spidx->dir = IPSEC_DIR_INBOUND; 830 831 spidx = &pcb->in6p_sp->sp_out->spidx; 832 error = ipsec_setspidx(m, spidx, 1); 833 if (error) 834 goto bad; 835 spidx->dir = IPSEC_DIR_OUTBOUND; 836 837 return 0; 838 839 bad: 840 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 841 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 842 return error; 843 } 844 #endif 845 846 /* 847 * configure security policy index (src/dst/proto/sport/dport) 848 * by looking at the content of mbuf. 849 * the caller is responsible for error recovery (like clearing up spidx). 850 */ 851 static int 852 ipsec_setspidx(m, spidx, needport) 853 struct mbuf *m; 854 struct secpolicyindex *spidx; 855 int needport; 856 { 857 struct ip *ip = NULL; 858 struct ip ipbuf; 859 u_int v; 860 struct mbuf *n; 861 int len; 862 int error; 863 864 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 865 866 /* 867 * validate m->m_pkthdr.len. we see incorrect length if we 868 * mistakenly call this function with inconsistent mbuf chain 869 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 870 */ 871 len = 0; 872 for (n = m; n; n = n->m_next) 873 len += n->m_len; 874 if (m->m_pkthdr.len != len) { 875 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 876 printf("ipsec_setspidx: " 877 "total of m_len(%d) != pkthdr.len(%d), " 878 "ignored.\n", 879 len, m->m_pkthdr.len)); 880 return EINVAL; 881 } 882 883 if (m->m_pkthdr.len < sizeof(struct ip)) { 884 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 885 printf("ipsec_setspidx: " 886 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 887 m->m_pkthdr.len)); 888 return EINVAL; 889 } 890 891 if (m->m_len >= sizeof(*ip)) 892 ip = mtod(m, struct ip *); 893 else { 894 m_copydata(m, 0, sizeof(ipbuf), &ipbuf); 895 ip = &ipbuf; 896 } 897 #ifdef _IP_VHL 898 v = _IP_VHL_V(ip->ip_vhl); 899 #else 900 v = ip->ip_v; 901 #endif 902 switch (v) { 903 case 4: 904 error = ipsec4_setspidx_ipaddr(m, spidx); 905 if (error) 906 return error; 907 ipsec4_get_ulp(m, spidx, needport); 908 return 0; 909 #ifdef INET6 910 case 6: 911 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 912 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 913 printf("ipsec_setspidx: " 914 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 915 "ignored.\n", m->m_pkthdr.len)); 916 return EINVAL; 917 } 918 error = ipsec6_setspidx_ipaddr(m, spidx); 919 if (error) 920 return error; 921 ipsec6_get_ulp(m, spidx, needport); 922 return 0; 923 #endif 924 default: 925 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 926 printf("ipsec_setspidx: " 927 "unknown IP version %u, ignored.\n", v)); 928 return EINVAL; 929 } 930 } 931 932 static void 933 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 934 { 935 u_int8_t nxt; 936 int off; 937 938 /* sanity check */ 939 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 940 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), 941 ("ipsec4_get_ulp: packet too short")); 942 943 /* NB: ip_input() flips it into host endian XXX need more checking */ 944 if (m->m_len >= sizeof(struct ip)) { 945 struct ip *ip = mtod(m, struct ip *); 946 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 947 goto done; 948 #ifdef _IP_VHL 949 off = _IP_VHL_HL(ip->ip_vhl) << 2; 950 #else 951 off = ip->ip_hl << 2; 952 #endif 953 nxt = ip->ip_p; 954 } else { 955 struct ip ih; 956 957 m_copydata(m, 0, sizeof (struct ip), &ih); 958 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 959 goto done; 960 #ifdef _IP_VHL 961 off = _IP_VHL_HL(ih.ip_vhl) << 2; 962 #else 963 off = ih.ip_hl << 2; 964 #endif 965 nxt = ih.ip_p; 966 } 967 968 while (off < m->m_pkthdr.len) { 969 struct ip6_ext ip6e; 970 struct tcphdr th; 971 struct udphdr uh; 972 973 switch (nxt) { 974 case IPPROTO_TCP: 975 spidx->ul_proto = nxt; 976 if (!needport) 977 goto done_proto; 978 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 979 goto done; 980 m_copydata(m, off, sizeof (th), &th); 981 spidx->src.sin.sin_port = th.th_sport; 982 spidx->dst.sin.sin_port = th.th_dport; 983 return; 984 case IPPROTO_UDP: 985 spidx->ul_proto = nxt; 986 if (!needport) 987 goto done_proto; 988 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 989 goto done; 990 m_copydata(m, off, sizeof (uh), &uh); 991 spidx->src.sin.sin_port = uh.uh_sport; 992 spidx->dst.sin.sin_port = uh.uh_dport; 993 return; 994 case IPPROTO_AH: 995 if (m->m_pkthdr.len > off + sizeof(ip6e)) 996 goto done; 997 /* XXX sigh, this works but is totally bogus */ 998 m_copydata(m, off, sizeof(ip6e), &ip6e); 999 off += (ip6e.ip6e_len + 2) << 2; 1000 nxt = ip6e.ip6e_nxt; 1001 break; 1002 case IPPROTO_ICMP: 1003 default: 1004 /* XXX intermediate headers??? */ 1005 spidx->ul_proto = nxt; 1006 goto done_proto; 1007 } 1008 } 1009 done: 1010 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1011 done_proto: 1012 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 1013 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 1014 } 1015 1016 /* assumes that m is sane */ 1017 static int 1018 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1019 { 1020 static const struct sockaddr_in template = { 1021 sizeof (struct sockaddr_in), 1022 AF_INET, 1023 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 1024 }; 1025 1026 spidx->src.sin = template; 1027 spidx->dst.sin = template; 1028 1029 if (m->m_len < sizeof (struct ip)) { 1030 m_copydata(m, offsetof(struct ip, ip_src), 1031 sizeof (struct in_addr), 1032 &spidx->src.sin.sin_addr); 1033 m_copydata(m, offsetof(struct ip, ip_dst), 1034 sizeof (struct in_addr), 1035 &spidx->dst.sin.sin_addr); 1036 } else { 1037 struct ip *ip = mtod(m, struct ip *); 1038 spidx->src.sin.sin_addr = ip->ip_src; 1039 spidx->dst.sin.sin_addr = ip->ip_dst; 1040 } 1041 1042 spidx->prefs = sizeof(struct in_addr) << 3; 1043 spidx->prefd = sizeof(struct in_addr) << 3; 1044 1045 return 0; 1046 } 1047 1048 #ifdef INET6 1049 static void 1050 ipsec6_get_ulp(m, spidx, needport) 1051 struct mbuf *m; 1052 struct secpolicyindex *spidx; 1053 int needport; 1054 { 1055 int off, nxt; 1056 struct tcphdr th; 1057 struct udphdr uh; 1058 1059 /* sanity check */ 1060 if (m == NULL) 1061 panic("ipsec6_get_ulp: NULL pointer was passed"); 1062 1063 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1064 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 1065 1066 /* set default */ 1067 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1068 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1069 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1070 1071 nxt = -1; 1072 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1073 if (off < 0 || m->m_pkthdr.len < off) 1074 return; 1075 1076 switch (nxt) { 1077 case IPPROTO_TCP: 1078 spidx->ul_proto = nxt; 1079 if (!needport) 1080 break; 1081 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1082 break; 1083 m_copydata(m, off, sizeof(th), &th); 1084 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1085 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1086 break; 1087 case IPPROTO_UDP: 1088 spidx->ul_proto = nxt; 1089 if (!needport) 1090 break; 1091 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1092 break; 1093 m_copydata(m, off, sizeof(uh), &uh); 1094 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1095 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1096 break; 1097 case IPPROTO_ICMPV6: 1098 default: 1099 /* XXX intermediate headers??? */ 1100 spidx->ul_proto = nxt; 1101 break; 1102 } 1103 } 1104 1105 /* assumes that m is sane */ 1106 static int 1107 ipsec6_setspidx_ipaddr(m, spidx) 1108 struct mbuf *m; 1109 struct secpolicyindex *spidx; 1110 { 1111 struct ip6_hdr *ip6 = NULL; 1112 struct ip6_hdr ip6buf; 1113 struct sockaddr_in6 *sin6; 1114 1115 if (m->m_len >= sizeof(*ip6)) 1116 ip6 = mtod(m, struct ip6_hdr *); 1117 else { 1118 m_copydata(m, 0, sizeof(ip6buf), &ip6buf); 1119 ip6 = &ip6buf; 1120 } 1121 1122 sin6 = (struct sockaddr_in6 *)&spidx->src; 1123 bzero(sin6, sizeof(*sin6)); 1124 sin6->sin6_family = AF_INET6; 1125 sin6->sin6_len = sizeof(struct sockaddr_in6); 1126 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 1127 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1128 sin6->sin6_addr.s6_addr16[1] = 0; 1129 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1130 } 1131 spidx->prefs = sizeof(struct in6_addr) << 3; 1132 1133 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1134 bzero(sin6, sizeof(*sin6)); 1135 sin6->sin6_family = AF_INET6; 1136 sin6->sin6_len = sizeof(struct sockaddr_in6); 1137 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 1138 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1139 sin6->sin6_addr.s6_addr16[1] = 0; 1140 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1141 } 1142 spidx->prefd = sizeof(struct in6_addr) << 3; 1143 1144 return 0; 1145 } 1146 #endif 1147 1148 static void 1149 ipsec_delpcbpolicy(p) 1150 struct inpcbpolicy *p; 1151 { 1152 free(p, M_SECA); 1153 } 1154 1155 /* initialize policy in PCB */ 1156 int 1157 ipsec_init_policy(so, pcb_sp) 1158 struct socket *so; 1159 struct inpcbpolicy **pcb_sp; 1160 { 1161 struct inpcbpolicy *new; 1162 1163 /* sanity check. */ 1164 if (so == NULL || pcb_sp == NULL) 1165 panic("ipsec_init_policy: NULL pointer was passed"); 1166 1167 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 1168 M_SECA, M_NOWAIT|M_ZERO); 1169 if (new == NULL) { 1170 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 1171 return ENOBUFS; 1172 } 1173 1174 if (IPSEC_PRIVILEGED_SO(so)) 1175 new->priv = 1; 1176 else 1177 new->priv = 0; 1178 1179 if ((new->sp_in = KEY_NEWSP()) == NULL) { 1180 ipsec_delpcbpolicy(new); 1181 return ENOBUFS; 1182 } 1183 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 1184 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 1185 1186 if ((new->sp_out = KEY_NEWSP()) == NULL) { 1187 KEY_FREESP(&new->sp_in); 1188 ipsec_delpcbpolicy(new); 1189 return ENOBUFS; 1190 } 1191 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 1192 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 1193 1194 *pcb_sp = new; 1195 1196 return 0; 1197 } 1198 1199 /* copy old ipsec policy into new */ 1200 int 1201 ipsec_copy_policy(old, new) 1202 struct inpcbpolicy *old, *new; 1203 { 1204 struct secpolicy *sp; 1205 1206 sp = ipsec_deepcopy_policy(old->sp_in); 1207 if (sp) { 1208 KEY_FREESP(&new->sp_in); 1209 new->sp_in = sp; 1210 } else 1211 return ENOBUFS; 1212 1213 sp = ipsec_deepcopy_policy(old->sp_out); 1214 if (sp) { 1215 KEY_FREESP(&new->sp_out); 1216 new->sp_out = sp; 1217 } else 1218 return ENOBUFS; 1219 1220 new->priv = old->priv; 1221 1222 return 0; 1223 } 1224 1225 /* deep-copy a policy in PCB */ 1226 static struct secpolicy * 1227 ipsec_deepcopy_policy(src) 1228 struct secpolicy *src; 1229 { 1230 struct ipsecrequest *newchain = NULL; 1231 struct ipsecrequest *p; 1232 struct ipsecrequest **q; 1233 struct ipsecrequest *r; 1234 struct secpolicy *dst; 1235 1236 if (src == NULL) 1237 return NULL; 1238 dst = KEY_NEWSP(); 1239 if (dst == NULL) 1240 return NULL; 1241 1242 /* 1243 * deep-copy IPsec request chain. This is required since struct 1244 * ipsecrequest is not reference counted. 1245 */ 1246 q = &newchain; 1247 for (p = src->req; p; p = p->next) { 1248 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest), 1249 M_SECA, M_NOWAIT); 1250 if (*q == NULL) 1251 goto fail; 1252 bzero(*q, sizeof(**q)); 1253 (*q)->next = NULL; 1254 1255 (*q)->saidx.proto = p->saidx.proto; 1256 (*q)->saidx.mode = p->saidx.mode; 1257 (*q)->level = p->level; 1258 (*q)->saidx.reqid = p->saidx.reqid; 1259 1260 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1261 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1262 1263 (*q)->sav = NULL; 1264 (*q)->sp = dst; 1265 1266 q = &((*q)->next); 1267 } 1268 1269 dst->req = newchain; 1270 dst->state = src->state; 1271 dst->policy = src->policy; 1272 /* do not touch the refcnt fields */ 1273 1274 return dst; 1275 1276 fail: 1277 for (p = newchain; p; p = r) { 1278 r = p->next; 1279 free(p, M_SECA); 1280 p = NULL; 1281 } 1282 return NULL; 1283 } 1284 1285 /* set policy and ipsec request if present. */ 1286 static int 1287 ipsec_set_policy( 1288 struct secpolicy **pcb_sp, 1289 int optname, 1290 void *request, 1291 size_t len, 1292 int priv 1293 ) 1294 { 1295 struct sadb_x_policy *xpl; 1296 struct secpolicy *newsp = NULL; 1297 int error; 1298 1299 /* sanity check. */ 1300 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1301 return EINVAL; 1302 if (len < sizeof(*xpl)) 1303 return EINVAL; 1304 xpl = (struct sadb_x_policy *)request; 1305 1306 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1307 printf("ipsec_set_policy: passed policy\n"); 1308 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1309 1310 /* check policy type */ 1311 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1312 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1313 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1314 return EINVAL; 1315 1316 /* check privileged socket */ 1317 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1318 return EACCES; 1319 1320 /* allocation new SP entry */ 1321 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1322 return error; 1323 1324 newsp->state = IPSEC_SPSTATE_ALIVE; 1325 1326 /* clear old SP and set new SP */ 1327 KEY_FREESP(pcb_sp); 1328 *pcb_sp = newsp; 1329 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1330 printf("ipsec_set_policy: new policy\n"); 1331 kdebug_secpolicy(newsp)); 1332 1333 return 0; 1334 } 1335 1336 static int 1337 ipsec_get_policy(pcb_sp, mp) 1338 struct secpolicy *pcb_sp; 1339 struct mbuf **mp; 1340 { 1341 1342 /* sanity check. */ 1343 if (pcb_sp == NULL || mp == NULL) 1344 return EINVAL; 1345 1346 *mp = key_sp2msg(pcb_sp); 1347 if (!*mp) { 1348 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1349 return ENOBUFS; 1350 } 1351 1352 (*mp)->m_type = MT_DATA; 1353 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1354 printf("ipsec_get_policy:\n"); 1355 kdebug_mbuf(*mp)); 1356 1357 return 0; 1358 } 1359 1360 int 1361 ipsec4_set_policy(inp, optname, request, len, priv) 1362 struct inpcb *inp; 1363 int optname; 1364 void *request; 1365 size_t len; 1366 int priv; 1367 { 1368 struct sadb_x_policy *xpl; 1369 struct secpolicy **pcb_sp; 1370 1371 /* sanity check. */ 1372 if (inp == NULL || request == NULL) 1373 return EINVAL; 1374 if (len < sizeof(*xpl)) 1375 return EINVAL; 1376 xpl = (struct sadb_x_policy *)request; 1377 1378 IPSEC_ASSERT(inp->inp_sp != NULL, 1379 ("ipsec4_set_policy(): null inp->in_sp")); 1380 1381 /* select direction */ 1382 switch (xpl->sadb_x_policy_dir) { 1383 case IPSEC_DIR_INBOUND: 1384 pcb_sp = &inp->inp_sp->sp_in; 1385 break; 1386 case IPSEC_DIR_OUTBOUND: 1387 pcb_sp = &inp->inp_sp->sp_out; 1388 break; 1389 default: 1390 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1391 xpl->sadb_x_policy_dir)); 1392 return EINVAL; 1393 } 1394 1395 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1396 } 1397 1398 int 1399 ipsec4_get_policy(inp, request, len, mp) 1400 struct inpcb *inp; 1401 void *request; 1402 size_t len; 1403 struct mbuf **mp; 1404 { 1405 struct sadb_x_policy *xpl; 1406 struct secpolicy *pcb_sp; 1407 1408 /* sanity check. */ 1409 if (inp == NULL || request == NULL || mp == NULL) 1410 return EINVAL; 1411 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1412 if (len < sizeof(*xpl)) 1413 return EINVAL; 1414 xpl = (struct sadb_x_policy *)request; 1415 1416 /* select direction */ 1417 switch (xpl->sadb_x_policy_dir) { 1418 case IPSEC_DIR_INBOUND: 1419 pcb_sp = inp->inp_sp->sp_in; 1420 break; 1421 case IPSEC_DIR_OUTBOUND: 1422 pcb_sp = inp->inp_sp->sp_out; 1423 break; 1424 default: 1425 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1426 xpl->sadb_x_policy_dir)); 1427 return EINVAL; 1428 } 1429 1430 return ipsec_get_policy(pcb_sp, mp); 1431 } 1432 1433 /* delete policy in PCB */ 1434 int 1435 ipsec4_delete_pcbpolicy(inp) 1436 struct inpcb *inp; 1437 { 1438 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1439 1440 if (inp->inp_sp == NULL) 1441 return 0; 1442 1443 if (inp->inp_sp->sp_in != NULL) 1444 KEY_FREESP(&inp->inp_sp->sp_in); 1445 1446 if (inp->inp_sp->sp_out != NULL) 1447 KEY_FREESP(&inp->inp_sp->sp_out); 1448 1449 ipsec_delpcbpolicy(inp->inp_sp); 1450 inp->inp_sp = NULL; 1451 1452 return 0; 1453 } 1454 1455 #ifdef INET6 1456 int 1457 ipsec6_set_policy(in6p, optname, request, len, priv) 1458 struct in6pcb *in6p; 1459 int optname; 1460 void *request; 1461 size_t len; 1462 int priv; 1463 { 1464 struct sadb_x_policy *xpl; 1465 struct secpolicy **pcb_sp; 1466 1467 /* sanity check. */ 1468 if (in6p == NULL || request == NULL) 1469 return EINVAL; 1470 if (len < sizeof(*xpl)) 1471 return EINVAL; 1472 xpl = (struct sadb_x_policy *)request; 1473 1474 /* select direction */ 1475 switch (xpl->sadb_x_policy_dir) { 1476 case IPSEC_DIR_INBOUND: 1477 pcb_sp = &in6p->in6p_sp->sp_in; 1478 break; 1479 case IPSEC_DIR_OUTBOUND: 1480 pcb_sp = &in6p->in6p_sp->sp_out; 1481 break; 1482 default: 1483 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1484 xpl->sadb_x_policy_dir)); 1485 return EINVAL; 1486 } 1487 1488 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1489 } 1490 1491 int 1492 ipsec6_get_policy(in6p, request, len, mp) 1493 struct in6pcb *in6p; 1494 void *request; 1495 size_t len; 1496 struct mbuf **mp; 1497 { 1498 struct sadb_x_policy *xpl; 1499 struct secpolicy *pcb_sp; 1500 1501 /* sanity check. */ 1502 if (in6p == NULL || request == NULL || mp == NULL) 1503 return EINVAL; 1504 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1505 if (len < sizeof(*xpl)) 1506 return EINVAL; 1507 xpl = (struct sadb_x_policy *)request; 1508 1509 /* select direction */ 1510 switch (xpl->sadb_x_policy_dir) { 1511 case IPSEC_DIR_INBOUND: 1512 pcb_sp = in6p->in6p_sp->sp_in; 1513 break; 1514 case IPSEC_DIR_OUTBOUND: 1515 pcb_sp = in6p->in6p_sp->sp_out; 1516 break; 1517 default: 1518 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1519 xpl->sadb_x_policy_dir)); 1520 return EINVAL; 1521 } 1522 1523 return ipsec_get_policy(pcb_sp, mp); 1524 } 1525 1526 int 1527 ipsec6_delete_pcbpolicy(in6p) 1528 struct in6pcb *in6p; 1529 { 1530 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1531 1532 if (in6p->in6p_sp == NULL) 1533 return 0; 1534 1535 if (in6p->in6p_sp->sp_in != NULL) 1536 KEY_FREESP(&in6p->in6p_sp->sp_in); 1537 1538 if (in6p->in6p_sp->sp_out != NULL) 1539 KEY_FREESP(&in6p->in6p_sp->sp_out); 1540 1541 ipsec_delpcbpolicy(in6p->in6p_sp); 1542 in6p->in6p_sp = NULL; 1543 1544 return 0; 1545 } 1546 #endif 1547 1548 /* 1549 * return current level. 1550 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1551 */ 1552 u_int 1553 ipsec_get_reqlevel(isr) 1554 struct ipsecrequest *isr; 1555 { 1556 u_int level = 0; 1557 u_int esp_trans_deflev, esp_net_deflev; 1558 u_int ah_trans_deflev, ah_net_deflev; 1559 1560 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1561 ("ipsec_get_reqlevel: null argument")); 1562 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1563 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1564 isr->sp->spidx.src.sa.sa_family, 1565 isr->sp->spidx.dst.sa.sa_family)); 1566 1567 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1568 #define IPSEC_CHECK_DEFAULT(lev) \ 1569 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1570 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1571 ? (ipsec_debug \ 1572 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1573 (lev), IPSEC_LEVEL_REQUIRE) \ 1574 : 0), \ 1575 (lev) = IPSEC_LEVEL_REQUIRE, \ 1576 (lev) \ 1577 : (lev)) 1578 1579 /* set default level */ 1580 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1581 #ifdef INET 1582 case AF_INET: 1583 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1584 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1585 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1586 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1587 break; 1588 #endif 1589 #ifdef INET6 1590 case AF_INET6: 1591 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1592 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1593 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1594 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1595 break; 1596 #endif /* INET6 */ 1597 default: 1598 panic("key_get_reqlevel: unknown af %u", 1599 isr->sp->spidx.src.sa.sa_family); 1600 } 1601 1602 #undef IPSEC_CHECK_DEFAULT 1603 1604 /* set level */ 1605 switch (isr->level) { 1606 case IPSEC_LEVEL_DEFAULT: 1607 switch (isr->saidx.proto) { 1608 case IPPROTO_ESP: 1609 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1610 level = esp_net_deflev; 1611 else 1612 level = esp_trans_deflev; 1613 break; 1614 case IPPROTO_AH: 1615 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1616 level = ah_net_deflev; 1617 else 1618 level = ah_trans_deflev; 1619 break; 1620 case IPPROTO_IPCOMP: 1621 /* 1622 * we don't really care, as IPcomp document says that 1623 * we shouldn't compress small packets 1624 */ 1625 level = IPSEC_LEVEL_USE; 1626 break; 1627 default: 1628 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1629 isr->saidx.proto); 1630 } 1631 break; 1632 1633 case IPSEC_LEVEL_USE: 1634 case IPSEC_LEVEL_REQUIRE: 1635 level = isr->level; 1636 break; 1637 case IPSEC_LEVEL_UNIQUE: 1638 level = IPSEC_LEVEL_REQUIRE; 1639 break; 1640 1641 default: 1642 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1643 isr->level); 1644 } 1645 1646 return level; 1647 } 1648 1649 /* 1650 * Check security policy requirements against the actual 1651 * packet contents. Return one if the packet should be 1652 * reject as "invalid"; otherwiser return zero to have the 1653 * packet treated as "valid". 1654 * 1655 * OUT: 1656 * 0: valid 1657 * 1: invalid 1658 */ 1659 int 1660 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1661 { 1662 struct ipsecrequest *isr; 1663 int need_auth; 1664 1665 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1666 printf("ipsec_in_reject: using SP\n"); 1667 kdebug_secpolicy(sp)); 1668 1669 /* check policy */ 1670 switch (sp->policy) { 1671 case IPSEC_POLICY_DISCARD: 1672 return 1; 1673 case IPSEC_POLICY_BYPASS: 1674 case IPSEC_POLICY_NONE: 1675 return 0; 1676 } 1677 1678 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1679 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1680 1681 /* XXX should compare policy against ipsec header history */ 1682 1683 need_auth = 0; 1684 for (isr = sp->req; isr != NULL; isr = isr->next) { 1685 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1686 continue; 1687 switch (isr->saidx.proto) { 1688 case IPPROTO_ESP: 1689 if ((m->m_flags & M_DECRYPTED) == 0) { 1690 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1691 printf("ipsec_in_reject: ESP m_flags:%x\n", 1692 m->m_flags)); 1693 return 1; 1694 } 1695 1696 if (!need_auth && 1697 isr->sav != NULL && 1698 isr->sav->tdb_authalgxform != NULL && 1699 (m->m_flags & M_AUTHIPDGM) == 0) { 1700 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1701 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1702 m->m_flags)); 1703 return 1; 1704 } 1705 break; 1706 case IPPROTO_AH: 1707 need_auth = 1; 1708 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1709 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1710 printf("ipsec_in_reject: AH m_flags:%x\n", 1711 m->m_flags)); 1712 return 1; 1713 } 1714 break; 1715 case IPPROTO_IPCOMP: 1716 /* 1717 * we don't really care, as IPcomp document 1718 * says that we shouldn't compress small 1719 * packets, IPComp policy should always be 1720 * treated as being in "use" level. 1721 */ 1722 break; 1723 } 1724 } 1725 return 0; /* valid */ 1726 } 1727 1728 /* 1729 * Check AH/ESP integrity. 1730 * This function is called from tcp_input(), udp_input(), 1731 * and {ah,esp}4_input for tunnel mode 1732 */ 1733 int 1734 ipsec4_in_reject(m, inp) 1735 struct mbuf *m; 1736 struct inpcb *inp; 1737 { 1738 struct secpolicy *sp; 1739 int error; 1740 int result; 1741 1742 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1743 1744 /* get SP for this packet. 1745 * When we are called from ip_forward(), we call 1746 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1747 */ 1748 if (inp == NULL) 1749 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1750 else 1751 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1752 IN4PCB_TO_PCB(inp), &error); 1753 1754 if (sp != NULL) { 1755 result = ipsec_in_reject(sp, m); 1756 if (result) 1757 newipsecstat.ips_in_polvio++; 1758 KEY_FREESP(&sp); 1759 } else { 1760 result = 0; /* XXX should be panic ? 1761 * -> No, there may be error. */ 1762 } 1763 return result; 1764 } 1765 1766 1767 #ifdef INET6 1768 /* 1769 * Check AH/ESP integrity. 1770 * This function is called from tcp6_input(), udp6_input(), 1771 * and {ah,esp}6_input for tunnel mode 1772 */ 1773 int 1774 ipsec6_in_reject(m, in6p) 1775 struct mbuf *m; 1776 struct in6pcb *in6p; 1777 { 1778 struct secpolicy *sp = NULL; 1779 int error; 1780 int result; 1781 1782 /* sanity check */ 1783 if (m == NULL) 1784 return 0; /* XXX should be panic ? */ 1785 1786 /* get SP for this packet. 1787 * When we are called from ip_forward(), we call 1788 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1789 */ 1790 if (in6p == NULL) 1791 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1792 else 1793 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1794 IN6PCB_TO_PCB(in6p), 1795 &error); 1796 1797 if (sp != NULL) { 1798 result = ipsec_in_reject(sp, m); 1799 if (result) 1800 newipsecstat.ips_in_polvio++; 1801 KEY_FREESP(&sp); 1802 } else { 1803 result = 0; 1804 } 1805 return result; 1806 } 1807 #endif 1808 1809 /* 1810 * compute the byte size to be occupied by IPsec header. 1811 * in case it is tunneled, it includes the size of outer IP header. 1812 * NOTE: SP passed is free in this function. 1813 */ 1814 static size_t 1815 ipsec_hdrsiz(struct secpolicy *sp) 1816 { 1817 struct ipsecrequest *isr; 1818 size_t siz; 1819 1820 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1821 printf("ipsec_hdrsiz: using SP\n"); 1822 kdebug_secpolicy(sp)); 1823 1824 switch (sp->policy) { 1825 case IPSEC_POLICY_DISCARD: 1826 case IPSEC_POLICY_BYPASS: 1827 case IPSEC_POLICY_NONE: 1828 return 0; 1829 } 1830 1831 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1832 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1833 1834 siz = 0; 1835 for (isr = sp->req; isr != NULL; isr = isr->next) { 1836 size_t clen = 0; 1837 1838 switch (isr->saidx.proto) { 1839 case IPPROTO_ESP: 1840 clen = esp_hdrsiz(isr->sav); 1841 break; 1842 case IPPROTO_AH: 1843 clen = ah_hdrsiz(isr->sav); 1844 break; 1845 case IPPROTO_IPCOMP: 1846 clen = sizeof(struct ipcomp); 1847 break; 1848 } 1849 1850 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1851 switch (isr->saidx.dst.sa.sa_family) { 1852 case AF_INET: 1853 clen += sizeof(struct ip); 1854 break; 1855 #ifdef INET6 1856 case AF_INET6: 1857 clen += sizeof(struct ip6_hdr); 1858 break; 1859 #endif 1860 default: 1861 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1862 "unknown AF %d in IPsec tunnel SA\n", 1863 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1864 break; 1865 } 1866 } 1867 siz += clen; 1868 } 1869 1870 return siz; 1871 } 1872 1873 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1874 size_t 1875 ipsec4_hdrsiz(m, dir, inp) 1876 struct mbuf *m; 1877 u_int dir; 1878 struct inpcb *inp; 1879 { 1880 struct secpolicy *sp; 1881 int error; 1882 size_t size; 1883 1884 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1885 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1886 ("ipsec4_hdrsize: socket w/o inpcb")); 1887 1888 /* get SP for this packet. 1889 * When we are called from ip_forward(), we call 1890 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1891 */ 1892 if (inp == NULL) 1893 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1894 else 1895 sp = ipsec_getpolicybysock(m, dir, 1896 IN4PCB_TO_PCB(inp), &error); 1897 1898 if (sp != NULL) { 1899 size = ipsec_hdrsiz(sp); 1900 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1901 printf("ipsec4_hdrsiz: size:%lu.\n", 1902 (unsigned long)size)); 1903 1904 KEY_FREESP(&sp); 1905 } else { 1906 size = 0; /* XXX should be panic ? */ 1907 } 1908 return size; 1909 } 1910 1911 #ifdef INET6 1912 /* This function is called from ipsec6_hdrsize_tcp(), 1913 * and maybe from ip6_forward.() 1914 */ 1915 size_t 1916 ipsec6_hdrsiz(m, dir, in6p) 1917 struct mbuf *m; 1918 u_int dir; 1919 struct in6pcb *in6p; 1920 { 1921 struct secpolicy *sp; 1922 int error; 1923 size_t size; 1924 1925 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1926 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1927 ("ipsec6_hdrsize: socket w/o inpcb")); 1928 1929 /* get SP for this packet */ 1930 /* XXX Is it right to call with IP_FORWARDING. */ 1931 if (in6p == NULL) 1932 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1933 else 1934 sp = ipsec_getpolicybysock(m, dir, 1935 IN6PCB_TO_PCB(in6p), 1936 &error); 1937 1938 if (sp == NULL) 1939 return 0; 1940 size = ipsec_hdrsiz(sp); 1941 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1942 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1943 KEY_FREESP(&sp); 1944 1945 return size; 1946 } 1947 #endif /*INET6*/ 1948 1949 /* 1950 * Check the variable replay window. 1951 * ipsec_chkreplay() performs replay check before ICV verification. 1952 * ipsec_updatereplay() updates replay bitmap. This must be called after 1953 * ICV verification (it also performs replay check, which is usually done 1954 * beforehand). 1955 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1956 * 1957 * based on RFC 2401. 1958 */ 1959 int 1960 ipsec_chkreplay(seq, sav) 1961 u_int32_t seq; 1962 struct secasvar *sav; 1963 { 1964 const struct secreplay *replay; 1965 u_int32_t diff; 1966 int fr; 1967 u_int32_t wsizeb; /* constant: bits of window size */ 1968 int frlast; /* constant: last frame */ 1969 1970 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 1971 1972 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1973 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1974 1975 replay = sav->replay; 1976 1977 if (replay->wsize == 0) 1978 return 1; /* no need to check replay. */ 1979 1980 /* constant */ 1981 frlast = replay->wsize - 1; 1982 wsizeb = replay->wsize << 3; 1983 1984 /* sequence number of 0 is invalid */ 1985 if (seq == 0) 1986 return 0; 1987 1988 /* first time is always okay */ 1989 if (replay->count == 0) 1990 return 1; 1991 1992 if (seq > replay->lastseq) { 1993 /* larger sequences are okay */ 1994 return 1; 1995 } else { 1996 /* seq is equal or less than lastseq. */ 1997 diff = replay->lastseq - seq; 1998 1999 /* over range to check, i.e. too old or wrapped */ 2000 if (diff >= wsizeb) 2001 return 0; 2002 2003 fr = frlast - diff / 8; 2004 2005 /* this packet already seen ? */ 2006 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2007 return 0; 2008 2009 /* out of order but good */ 2010 return 1; 2011 } 2012 } 2013 2014 /* 2015 * check replay counter whether to update or not. 2016 * OUT: 0: OK 2017 * 1: NG 2018 */ 2019 int 2020 ipsec_updatereplay(seq, sav) 2021 u_int32_t seq; 2022 struct secasvar *sav; 2023 { 2024 struct secreplay *replay; 2025 u_int32_t diff; 2026 int fr; 2027 u_int32_t wsizeb; /* constant: bits of window size */ 2028 int frlast; /* constant: last frame */ 2029 2030 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 2031 2032 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 2033 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 2034 2035 replay = sav->replay; 2036 2037 if (replay->wsize == 0) 2038 goto ok; /* no need to check replay. */ 2039 2040 /* constant */ 2041 frlast = replay->wsize - 1; 2042 wsizeb = replay->wsize << 3; 2043 2044 /* sequence number of 0 is invalid */ 2045 if (seq == 0) 2046 return 1; 2047 2048 /* first time */ 2049 if (replay->count == 0) { 2050 replay->lastseq = seq; 2051 bzero(replay->bitmap, replay->wsize); 2052 (replay->bitmap)[frlast] = 1; 2053 goto ok; 2054 } 2055 2056 if (seq > replay->lastseq) { 2057 /* seq is larger than lastseq. */ 2058 diff = seq - replay->lastseq; 2059 2060 /* new larger sequence number */ 2061 if (diff < wsizeb) { 2062 /* In window */ 2063 /* set bit for this packet */ 2064 vshiftl(replay->bitmap, diff, replay->wsize); 2065 (replay->bitmap)[frlast] |= 1; 2066 } else { 2067 /* this packet has a "way larger" */ 2068 bzero(replay->bitmap, replay->wsize); 2069 (replay->bitmap)[frlast] = 1; 2070 } 2071 replay->lastseq = seq; 2072 2073 /* larger is good */ 2074 } else { 2075 /* seq is equal or less than lastseq. */ 2076 diff = replay->lastseq - seq; 2077 2078 /* over range to check, i.e. too old or wrapped */ 2079 if (diff >= wsizeb) 2080 return 1; 2081 2082 fr = frlast - diff / 8; 2083 2084 /* this packet already seen ? */ 2085 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2086 return 1; 2087 2088 /* mark as seen */ 2089 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2090 2091 /* out of order but good */ 2092 } 2093 2094 ok: 2095 if (replay->count == ~0) { 2096 2097 /* set overflow flag */ 2098 replay->overflow++; 2099 2100 /* don't increment, no more packets accepted */ 2101 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2102 return 1; 2103 2104 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2105 replay->overflow, ipsec_logsastr(sav))); 2106 } 2107 2108 replay->count++; 2109 2110 return 0; 2111 } 2112 2113 /* 2114 * shift variable length bunffer to left. 2115 * IN: bitmap: pointer to the buffer 2116 * nbit: the number of to shift. 2117 * wsize: buffer size (bytes). 2118 */ 2119 static void 2120 vshiftl(bitmap, nbit, wsize) 2121 unsigned char *bitmap; 2122 int nbit, wsize; 2123 { 2124 int s, j, i; 2125 unsigned char over; 2126 2127 for (j = 0; j < nbit; j += 8) { 2128 s = (nbit - j < 8) ? (nbit - j): 8; 2129 bitmap[0] <<= s; 2130 for (i = 1; i < wsize; i++) { 2131 over = (bitmap[i] >> (8 - s)); 2132 bitmap[i] <<= s; 2133 bitmap[i-1] |= over; 2134 } 2135 } 2136 2137 return; 2138 } 2139 2140 /* Return a printable string for the IPv4 address. */ 2141 static char * 2142 inet_ntoa4(struct in_addr ina) 2143 { 2144 static char buf[4][4 * sizeof "123" + 4]; 2145 unsigned char *ucp = (unsigned char *) &ina; 2146 static int i = 3; 2147 2148 i = (i + 1) % 4; 2149 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2150 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2151 return (buf[i]); 2152 } 2153 2154 /* Return a printable string for the address. */ 2155 const char * 2156 ipsec_address(union sockaddr_union* sa) 2157 { 2158 switch (sa->sa.sa_family) { 2159 #if INET 2160 case AF_INET: 2161 return inet_ntoa4(sa->sin.sin_addr); 2162 #endif /* INET */ 2163 2164 #if INET6 2165 case AF_INET6: 2166 return ip6_sprintf(&sa->sin6.sin6_addr); 2167 #endif /* INET6 */ 2168 2169 default: 2170 return "(unknown address family)"; 2171 } 2172 } 2173 2174 const char * 2175 ipsec_logsastr(sav) 2176 struct secasvar *sav; 2177 { 2178 static char buf[256]; 2179 char *p; 2180 struct secasindex *saidx = &sav->sah->saidx; 2181 2182 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2183 ("ipsec_logsastr: address family mismatch")); 2184 2185 p = buf; 2186 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2187 while (p && *p) 2188 p++; 2189 /* NB: only use ipsec_address on one address at a time */ 2190 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2191 ipsec_address(&saidx->src)); 2192 while (p && *p) 2193 p++; 2194 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2195 ipsec_address(&saidx->dst)); 2196 2197 return buf; 2198 } 2199 2200 void 2201 ipsec_dumpmbuf(m) 2202 struct mbuf *m; 2203 { 2204 int totlen; 2205 int i; 2206 u_char *p; 2207 2208 totlen = 0; 2209 printf("---\n"); 2210 while (m) { 2211 p = mtod(m, u_char *); 2212 for (i = 0; i < m->m_len; i++) { 2213 printf("%02x ", p[i]); 2214 totlen++; 2215 if (totlen % 16 == 0) 2216 printf("\n"); 2217 } 2218 m = m->m_next; 2219 } 2220 if (totlen % 16 != 0) 2221 printf("\n"); 2222 printf("---\n"); 2223 } 2224 2225 #ifdef INET6 2226 struct secpolicy * 2227 ipsec6_check_policy(m,so,flags,needipsecp,errorp) 2228 struct mbuf * m; 2229 const struct socket * so; 2230 int flags; 2231 int * needipsecp; 2232 int * errorp; 2233 { 2234 struct in6pcb *in6p = NULL; 2235 struct m_tag *mtag; 2236 struct secpolicy *sp = NULL; 2237 struct tdb_ident *tdbi; 2238 int s; 2239 int error = 0; 2240 int needipsec = 0; 2241 2242 if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6) 2243 in6p = sotoin6pcb(so); 2244 2245 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 2246 s = splsoftnet(); 2247 if (mtag != NULL) { 2248 tdbi = (struct tdb_ident *)(mtag + 1); 2249 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND); 2250 if (sp == NULL) 2251 error = -EINVAL; /* force silent drop */ 2252 m_tag_delete(m, mtag); 2253 } else { 2254 if (in6p != NULL && 2255 IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) 2256 goto skippolicycheck; 2257 sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p); 2258 } 2259 2260 /* 2261 * There are four return cases: 2262 * sp != NULL apply IPsec policy 2263 * sp == NULL, error == 0 no IPsec handling needed 2264 * sp == NULL, error == -EINVAL discard packet w/o error 2265 * sp == NULL, error != 0 discard packet, report error 2266 */ 2267 2268 if (sp == NULL) { 2269 splx(s); 2270 2271 if (error != 0) { 2272 needipsec = 0; 2273 } else { 2274 /* No IPsec processing for this packet. */ 2275 needipsec = 0; 2276 } 2277 } else { 2278 /* Loop detection, check if ipsec processing already done */ 2279 IPSEC_ASSERT(sp->req != NULL, ("ip6_output: no ipsec request")); 2280 for (mtag = m_tag_first(m); mtag != NULL; 2281 mtag = m_tag_next(m, mtag)) { 2282 #ifdef MTAG_ABI_COMPAT 2283 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT) 2284 continue; 2285 #endif 2286 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE && 2287 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED) 2288 continue; 2289 /* 2290 * Check if policy has an SA associated with it. 2291 * This can happen when an SP has yet to acquire 2292 * an SA; e.g. on first reference. If it occurs, 2293 * then we let ipsec4_process_packet do its thing. 2294 */ 2295 if (sp->req->sav == NULL) 2296 break; 2297 tdbi = (struct tdb_ident *)(mtag + 1); 2298 if (tdbi->spi == sp->req->sav->spi && 2299 tdbi->proto == sp->req->sav->sah->saidx.proto && 2300 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst, 2301 sizeof (union sockaddr_union)) == 0) { 2302 /* 2303 * No IPsec processing is needed, free 2304 * reference to SP. 2305 * 2306 * NB: null pointer to avoid free at 2307 * done: below. 2308 */ 2309 KEY_FREESP(&sp), sp = NULL; 2310 needipsec = 0; 2311 splx(s); 2312 goto skippolicycheck; 2313 } 2314 } 2315 splx(s); 2316 needipsec = 1; 2317 } 2318 skippolicycheck:; 2319 2320 *errorp = error; 2321 *needipsecp = needipsec; 2322 return sp; 2323 } 2324 #endif 2325 2326 2327 2328 /* XXX this stuff doesn't belong here... */ 2329 2330 static struct xformsw* xforms = NULL; 2331 2332 /* 2333 * Register a transform; typically at system startup. 2334 */ 2335 void 2336 xform_register(struct xformsw* xsp) 2337 { 2338 xsp->xf_next = xforms; 2339 xforms = xsp; 2340 } 2341 2342 /* 2343 * Initialize transform support in an sav. 2344 */ 2345 int 2346 xform_init(struct secasvar *sav, int xftype) 2347 { 2348 struct xformsw *xsp; 2349 2350 if (sav->tdb_xform != NULL) /* previously initialized */ 2351 return 0; 2352 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2353 if (xsp->xf_type == xftype) 2354 return (*xsp->xf_init)(sav, xsp); 2355 2356 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2357 return EINVAL; 2358 } 2359 2360 #ifdef __NetBSD__ 2361 void 2362 ipsec_attach(void) 2363 { 2364 printf("initializing IPsec..."); 2365 ah_attach(); 2366 esp_attach(); 2367 ipcomp_attach(); 2368 ipe4_attach(); 2369 #ifdef TCP_SIGNATURE 2370 tcpsignature_attach(); 2371 #endif 2372 printf(" done\n"); 2373 } 2374 #endif /* __NetBSD__ */ 2375
Indexes created Sun Sep 21 16:09:51 GMT 2025