ipsec.c revision 1.28
1 /* $NetBSD: ipsec.c,v 1.28 2007/03/04 21:17:54 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 1.28 2007/03/04 21:17:54 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, &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 if (bcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, 295 sizeof(spidx))) { 296 if (!key_cmpspidx_withmask(&pcbsp->sp_cache[dir].cachesp->spidx, 297 &spidx)) 298 return NULL; 299 pcbsp->sp_cache[dir].cacheidx = spidx; 300 } 301 } else { 302 /* 303 * The pcb is connected, and the L4 code is sure that: 304 * - outgoing side uses inp_[lf]addr 305 * - incoming side looks up policy after inpcb lookup 306 * and address pair is know to be stable. We do not need 307 * to generate spidx again, nor check the address match again. 308 * 309 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 310 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 311 */ 312 } 313 314 pcbsp->sp_cache[dir].cachesp->lastused = time_second; 315 pcbsp->sp_cache[dir].cachesp->refcnt++; 316 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 317 printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n", 318 pcbsp->sp_cache[dir].cachesp->refcnt, 319 pcbsp->sp_cache[dir].cachesp)); 320 return pcbsp->sp_cache[dir].cachesp; 321 } 322 323 static int 324 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 325 struct secpolicy *sp, int dir) 326 { 327 328 switch (dir) { 329 case IPSEC_DIR_INBOUND: 330 case IPSEC_DIR_OUTBOUND: 331 break; 332 default: 333 return EINVAL; 334 } 335 #ifdef DIAGNOSTIC 336 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 337 panic("dir too big in ipsec_fillpcbcache"); 338 #endif 339 340 if (pcbsp->sp_cache[dir].cachesp) 341 KEY_FREESP(&pcbsp->sp_cache[dir].cachesp); 342 pcbsp->sp_cache[dir].cachesp = NULL; 343 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE; 344 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 345 return EINVAL; 346 } 347 pcbsp->sp_cache[dir].cachesp = sp; 348 if (pcbsp->sp_cache[dir].cachesp) { 349 pcbsp->sp_cache[dir].cachesp->refcnt++; 350 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 351 printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n", 352 pcbsp->sp_cache[dir].cachesp->refcnt, 353 pcbsp->sp_cache[dir].cachesp)); 354 355 /* 356 * If the PCB is connected, we can remember a hint to 357 * possibly short-circuit IPsec processing in other places. 358 */ 359 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 360 switch (pcbsp->sp_cache[dir].cachesp->policy) { 361 case IPSEC_POLICY_NONE: 362 case IPSEC_POLICY_BYPASS: 363 pcbsp->sp_cache[dir].cachehint = 364 IPSEC_PCBHINT_NO; 365 break; 366 default: 367 pcbsp->sp_cache[dir].cachehint = 368 IPSEC_PCBHINT_YES; 369 } 370 } 371 } 372 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 373 374 return 0; 375 } 376 377 static int 378 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 379 { 380 int i; 381 382 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 383 if (dir != IPSEC_DIR_ANY && i != dir) 384 continue; 385 if (pcbsp->sp_cache[i].cachesp) 386 KEY_FREESP(&pcbsp->sp_cache[i].cachesp); 387 pcbsp->sp_cache[i].cachesp = NULL; 388 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE; 389 pcbsp->sp_cache[i].cachegen = 0; 390 bzero(&pcbsp->sp_cache[i].cacheidx, 391 sizeof(pcbsp->sp_cache[i].cacheidx)); 392 } 393 return 0; 394 } 395 396 void 397 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 398 { 399 400 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 401 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 402 } 403 404 void 405 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 406 { 407 408 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 409 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 410 } 411 412 void 413 ipsec_invalpcbcacheall(void) 414 { 415 416 if (ipsec_spdgen == UINT_MAX) 417 ipsec_spdgen = 1; 418 else 419 ipsec_spdgen++; 420 } 421 #endif /* __NetBSD__ */ 422 423 /* 424 * Return a held reference to the default SP. 425 */ 426 static struct secpolicy * 427 key_allocsp_default(const char* where, int tag) 428 { 429 struct secpolicy *sp; 430 431 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 432 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 433 434 sp = &ip4_def_policy; 435 if (sp->policy != IPSEC_POLICY_DISCARD && 436 sp->policy != IPSEC_POLICY_NONE) { 437 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 438 sp->policy, IPSEC_POLICY_NONE)); 439 sp->policy = IPSEC_POLICY_NONE; 440 } 441 sp->refcnt++; 442 443 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 444 printf("DP key_allocsp_default returns SP:%p (%u)\n", 445 sp, sp->refcnt)); 446 return sp; 447 } 448 #define KEY_ALLOCSP_DEFAULT() \ 449 key_allocsp_default(__FILE__, __LINE__) 450 451 /* 452 * For OUTBOUND packet having a socket. Searching SPD for packet, 453 * and return a pointer to SP. 454 * OUT: NULL: no apropreate SP found, the following value is set to error. 455 * 0 : bypass 456 * EACCES : discard packet. 457 * ENOENT : ipsec_acquire() in progress, maybe. 458 * others : error occurred. 459 * others: a pointer to SP 460 * 461 * NOTE: IPv6 mapped address concern is implemented here. 462 */ 463 struct secpolicy * 464 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 465 { 466 struct secpolicy *sp; 467 468 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 469 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 470 ("ipsec_getpolicy: invalid direction %u", dir)); 471 472 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 473 if (sp == NULL) /*XXX????*/ 474 sp = KEY_ALLOCSP_DEFAULT(); 475 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 476 return sp; 477 } 478 479 /* 480 * For OUTBOUND packet having a socket. Searching SPD for packet, 481 * and return a pointer to SP. 482 * OUT: NULL: no apropreate SP found, the following value is set to error. 483 * 0 : bypass 484 * EACCES : discard packet. 485 * ENOENT : ipsec_acquire() in progress, maybe. 486 * others : error occurred. 487 * others: a pointer to SP 488 * 489 * NOTE: IPv6 mapped address concern is implemented here. 490 */ 491 static struct secpolicy * 492 ipsec_getpolicybysock(m, dir, inp, error) 493 struct mbuf *m; 494 u_int dir; 495 PCB_T *inp; 496 int *error; 497 { 498 struct inpcbpolicy *pcbsp = NULL; 499 struct secpolicy *currsp = NULL; /* policy on socket */ 500 struct secpolicy *sp; 501 int af; 502 503 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 504 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 505 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 506 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 507 ("ipsec_getpolicybysock: invalid direction %u", dir)); 508 509 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, 510 ("ipsec_getppolicybysock: null socket\n")); 511 512 /* XXX FIXME inpcb/in6pcb vs socket*/ 513 af = PCB_FAMILY(inp); 514 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 515 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 516 517 #ifdef __NetBSD__ 518 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache")); 519 /* If we have a cached entry, and if it is still valid, use it. */ 520 ipsecstat.ips_spdcache_lookup++; 521 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); 522 if (currsp) { 523 *error = 0; 524 return currsp; 525 } 526 ipsecstat.ips_spdcache_miss++; 527 #endif /* __NetBSD__ */ 528 529 switch (af) { 530 case AF_INET: { 531 struct inpcb *in4p = PCB_TO_IN4PCB(inp); 532 /* set spidx in pcb */ 533 *error = ipsec4_setspidx_inpcb(m, in4p); 534 pcbsp = in4p->inp_sp; 535 break; 536 } 537 538 #if defined(INET6) 539 case AF_INET6: { 540 struct in6pcb *in6p = PCB_TO_IN6PCB(inp); 541 /* set spidx in pcb */ 542 *error = ipsec6_setspidx_in6pcb(m, in6p); 543 pcbsp = in6p->in6p_sp; 544 break; 545 } 546 #endif 547 default: 548 *error = EPFNOSUPPORT; 549 break; 550 } 551 if (*error) 552 return NULL; 553 554 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 555 switch (dir) { 556 case IPSEC_DIR_INBOUND: 557 currsp = pcbsp->sp_in; 558 break; 559 case IPSEC_DIR_OUTBOUND: 560 currsp = pcbsp->sp_out; 561 break; 562 } 563 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 564 565 if (pcbsp->priv) { /* when privilieged socket */ 566 switch (currsp->policy) { 567 case IPSEC_POLICY_BYPASS: 568 case IPSEC_POLICY_IPSEC: 569 currsp->refcnt++; 570 sp = currsp; 571 break; 572 573 case IPSEC_POLICY_ENTRUST: 574 /* look for a policy in SPD */ 575 sp = KEY_ALLOCSP(&currsp->spidx, dir); 576 if (sp == NULL) /* no SP found */ 577 sp = KEY_ALLOCSP_DEFAULT(); 578 break; 579 580 default: 581 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 582 "Invalid policy for PCB %d\n", currsp->policy)); 583 *error = EINVAL; 584 return NULL; 585 } 586 } else { /* unpriv, SPD has policy */ 587 sp = KEY_ALLOCSP(&currsp->spidx, dir); 588 if (sp == NULL) { /* no SP found */ 589 switch (currsp->policy) { 590 case IPSEC_POLICY_BYPASS: 591 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 592 "Illegal policy for non-priviliged defined %d\n", 593 currsp->policy)); 594 *error = EINVAL; 595 return NULL; 596 597 case IPSEC_POLICY_ENTRUST: 598 sp = KEY_ALLOCSP_DEFAULT(); 599 break; 600 601 case IPSEC_POLICY_IPSEC: 602 currsp->refcnt++; 603 sp = currsp; 604 break; 605 606 default: 607 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 608 "Invalid policy for PCB %d\n", currsp->policy)); 609 *error = EINVAL; 610 return NULL; 611 } 612 } 613 } 614 IPSEC_ASSERT(sp != NULL, 615 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 616 pcbsp->priv, currsp->policy)); 617 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 618 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 619 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 620 sp, sp->refcnt)); 621 #ifdef __NetBSD__ 622 ipsec_fillpcbcache(pcbsp, m, sp, dir); 623 #endif /* __NetBSD__ */ 624 return sp; 625 } 626 627 /* 628 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 629 * and return a pointer to SP. 630 * OUT: positive: a pointer to the entry for security policy leaf matched. 631 * NULL: no apropreate SP found, the following value is set to error. 632 * 0 : bypass 633 * EACCES : discard packet. 634 * ENOENT : ipsec_acquire() in progress, maybe. 635 * others : error occurred. 636 */ 637 struct secpolicy * 638 ipsec_getpolicybyaddr(m, dir, flag, error) 639 struct mbuf *m; 640 u_int dir; 641 int flag; 642 int *error; 643 { 644 struct secpolicyindex spidx; 645 struct secpolicy *sp; 646 647 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 648 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 649 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 650 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 651 652 sp = NULL; 653 if (key_havesp(dir)) { 654 /* Make an index to look for a policy. */ 655 *error = ipsec_setspidx(m, &spidx, 656 (flag & IP_FORWARDING) ? 0 : 1); 657 if (*error != 0) { 658 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 659 " dir %u flag %u\n", dir, flag)); 660 bzero(&spidx, sizeof (spidx)); 661 return NULL; 662 } 663 spidx.dir = dir; 664 665 sp = KEY_ALLOCSP(&spidx, dir); 666 } 667 if (sp == NULL) /* no SP found, use system default */ 668 sp = KEY_ALLOCSP_DEFAULT(); 669 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 670 return sp; 671 } 672 673 struct secpolicy * 674 ipsec4_checkpolicy(m, dir, flag, error, inp) 675 struct mbuf *m; 676 u_int dir, flag; 677 int *error; 678 struct inpcb *inp; 679 { 680 struct secpolicy *sp; 681 682 *error = 0; 683 684 685 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 686 if (inp == NULL || inp->inp_socket == NULL) { 687 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 688 } else 689 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); 690 if (sp == NULL) { 691 IPSEC_ASSERT(*error != 0, 692 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 693 newipsecstat.ips_out_inval++; 694 return NULL; 695 } 696 IPSEC_ASSERT(*error == 0, 697 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 698 switch (sp->policy) { 699 case IPSEC_POLICY_ENTRUST: 700 default: 701 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 702 /* fall thru... */ 703 case IPSEC_POLICY_DISCARD: 704 newipsecstat.ips_out_polvio++; 705 *error = -EINVAL; /* packet is discarded by caller */ 706 break; 707 case IPSEC_POLICY_BYPASS: 708 case IPSEC_POLICY_NONE: 709 KEY_FREESP(&sp); 710 sp = NULL; /* NB: force NULL result */ 711 break; 712 case IPSEC_POLICY_IPSEC: 713 if (sp->req == NULL) /* acquire an SA */ 714 *error = key_spdacquire(sp); 715 break; 716 } 717 if (*error != 0) { 718 KEY_FREESP(&sp); 719 sp = NULL; 720 } 721 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 722 return sp; 723 } 724 725 #ifdef INET6 726 struct secpolicy * 727 ipsec6_checkpolicy(m, dir, flag, error, in6p) 728 struct mbuf *m; 729 u_int dir, flag; 730 int *error; 731 struct in6pcb *in6p; 732 { 733 struct secpolicy *sp; 734 735 *error = 0; 736 737 738 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 739 if (in6p == NULL || in6p->in6p_socket == NULL) { 740 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 741 } else 742 sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error); 743 if (sp == NULL) { 744 IPSEC_ASSERT(*error != 0, 745 ("ipsec6_checkpolicy: getpolicy failed w/o error")); 746 newipsecstat.ips_out_inval++; 747 return NULL; 748 } 749 IPSEC_ASSERT(*error == 0, 750 ("ipsec6_checkpolicy: sp w/ error set to %u", *error)); 751 switch (sp->policy) { 752 case IPSEC_POLICY_ENTRUST: 753 default: 754 printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy); 755 /* fall thru... */ 756 case IPSEC_POLICY_DISCARD: 757 newipsecstat.ips_out_polvio++; 758 *error = -EINVAL; /* packet is discarded by caller */ 759 break; 760 case IPSEC_POLICY_BYPASS: 761 case IPSEC_POLICY_NONE: 762 KEY_FREESP(&sp); 763 sp = NULL; /* NB: force NULL result */ 764 break; 765 case IPSEC_POLICY_IPSEC: 766 if (sp->req == NULL) /* acquire an SA */ 767 *error = key_spdacquire(sp); 768 break; 769 } 770 if (*error != 0) { 771 KEY_FREESP(&sp); 772 sp = NULL; 773 } 774 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 775 return sp; 776 } 777 #endif /* INET6 */ 778 779 static int 780 ipsec4_setspidx_inpcb(m, pcb) 781 struct mbuf *m; 782 struct inpcb *pcb; 783 { 784 int error; 785 786 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 787 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 788 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 789 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 790 791 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 792 if (error == 0) { 793 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 794 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 795 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 796 } else { 797 bzero(&pcb->inp_sp->sp_in->spidx, 798 sizeof (pcb->inp_sp->sp_in->spidx)); 799 bzero(&pcb->inp_sp->sp_out->spidx, 800 sizeof (pcb->inp_sp->sp_in->spidx)); 801 } 802 return error; 803 } 804 805 #ifdef INET6 806 static int 807 ipsec6_setspidx_in6pcb(m, pcb) 808 struct mbuf *m; 809 struct in6pcb *pcb; 810 { 811 struct secpolicyindex *spidx; 812 int error; 813 814 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 815 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 816 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 817 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 818 819 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 820 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 821 822 spidx = &pcb->in6p_sp->sp_in->spidx; 823 error = ipsec_setspidx(m, spidx, 1); 824 if (error) 825 goto bad; 826 spidx->dir = IPSEC_DIR_INBOUND; 827 828 spidx = &pcb->in6p_sp->sp_out->spidx; 829 error = ipsec_setspidx(m, spidx, 1); 830 if (error) 831 goto bad; 832 spidx->dir = IPSEC_DIR_OUTBOUND; 833 834 return 0; 835 836 bad: 837 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 838 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 839 return error; 840 } 841 #endif 842 843 /* 844 * configure security policy index (src/dst/proto/sport/dport) 845 * by looking at the content of mbuf. 846 * the caller is responsible for error recovery (like clearing up spidx). 847 */ 848 static int 849 ipsec_setspidx(m, spidx, needport) 850 struct mbuf *m; 851 struct secpolicyindex *spidx; 852 int needport; 853 { 854 struct ip *ip = NULL; 855 struct ip ipbuf; 856 u_int v; 857 struct mbuf *n; 858 int len; 859 int error; 860 861 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 862 863 /* 864 * validate m->m_pkthdr.len. we see incorrect length if we 865 * mistakenly call this function with inconsistent mbuf chain 866 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 867 */ 868 len = 0; 869 for (n = m; n; n = n->m_next) 870 len += n->m_len; 871 if (m->m_pkthdr.len != len) { 872 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 873 printf("ipsec_setspidx: " 874 "total of m_len(%d) != pkthdr.len(%d), " 875 "ignored.\n", 876 len, m->m_pkthdr.len)); 877 return EINVAL; 878 } 879 880 if (m->m_pkthdr.len < sizeof(struct ip)) { 881 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 882 printf("ipsec_setspidx: " 883 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 884 m->m_pkthdr.len)); 885 return EINVAL; 886 } 887 888 if (m->m_len >= sizeof(*ip)) 889 ip = mtod(m, struct ip *); 890 else { 891 m_copydata(m, 0, sizeof(ipbuf), &ipbuf); 892 ip = &ipbuf; 893 } 894 #ifdef _IP_VHL 895 v = _IP_VHL_V(ip->ip_vhl); 896 #else 897 v = ip->ip_v; 898 #endif 899 switch (v) { 900 case 4: 901 error = ipsec4_setspidx_ipaddr(m, spidx); 902 if (error) 903 return error; 904 ipsec4_get_ulp(m, spidx, needport); 905 return 0; 906 #ifdef INET6 907 case 6: 908 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 909 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 910 printf("ipsec_setspidx: " 911 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 912 "ignored.\n", m->m_pkthdr.len)); 913 return EINVAL; 914 } 915 error = ipsec6_setspidx_ipaddr(m, spidx); 916 if (error) 917 return error; 918 ipsec6_get_ulp(m, spidx, needport); 919 return 0; 920 #endif 921 default: 922 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 923 printf("ipsec_setspidx: " 924 "unknown IP version %u, ignored.\n", v)); 925 return EINVAL; 926 } 927 } 928 929 static void 930 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 931 { 932 u_int8_t nxt; 933 int off; 934 935 /* sanity check */ 936 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 937 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), 938 ("ipsec4_get_ulp: packet too short")); 939 940 /* NB: ip_input() flips it into host endian XXX need more checking */ 941 if (m->m_len >= sizeof(struct ip)) { 942 struct ip *ip = mtod(m, struct ip *); 943 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 944 goto done; 945 #ifdef _IP_VHL 946 off = _IP_VHL_HL(ip->ip_vhl) << 2; 947 #else 948 off = ip->ip_hl << 2; 949 #endif 950 nxt = ip->ip_p; 951 } else { 952 struct ip ih; 953 954 m_copydata(m, 0, sizeof (struct ip), &ih); 955 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 956 goto done; 957 #ifdef _IP_VHL 958 off = _IP_VHL_HL(ih.ip_vhl) << 2; 959 #else 960 off = ih.ip_hl << 2; 961 #endif 962 nxt = ih.ip_p; 963 } 964 965 while (off < m->m_pkthdr.len) { 966 struct ip6_ext ip6e; 967 struct tcphdr th; 968 struct udphdr uh; 969 970 switch (nxt) { 971 case IPPROTO_TCP: 972 spidx->ul_proto = nxt; 973 if (!needport) 974 goto done_proto; 975 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 976 goto done; 977 m_copydata(m, off, sizeof (th), &th); 978 spidx->src.sin.sin_port = th.th_sport; 979 spidx->dst.sin.sin_port = th.th_dport; 980 return; 981 case IPPROTO_UDP: 982 spidx->ul_proto = nxt; 983 if (!needport) 984 goto done_proto; 985 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 986 goto done; 987 m_copydata(m, off, sizeof (uh), &uh); 988 spidx->src.sin.sin_port = uh.uh_sport; 989 spidx->dst.sin.sin_port = uh.uh_dport; 990 return; 991 case IPPROTO_AH: 992 if (m->m_pkthdr.len > off + sizeof(ip6e)) 993 goto done; 994 /* XXX sigh, this works but is totally bogus */ 995 m_copydata(m, off, sizeof(ip6e), &ip6e); 996 off += (ip6e.ip6e_len + 2) << 2; 997 nxt = ip6e.ip6e_nxt; 998 break; 999 case IPPROTO_ICMP: 1000 default: 1001 /* XXX intermediate headers??? */ 1002 spidx->ul_proto = nxt; 1003 goto done_proto; 1004 } 1005 } 1006 done: 1007 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1008 done_proto: 1009 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 1010 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 1011 } 1012 1013 /* assumes that m is sane */ 1014 static int 1015 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1016 { 1017 static const struct sockaddr_in template = { 1018 sizeof (struct sockaddr_in), 1019 AF_INET, 1020 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 1021 }; 1022 1023 spidx->src.sin = template; 1024 spidx->dst.sin = template; 1025 1026 if (m->m_len < sizeof (struct ip)) { 1027 m_copydata(m, offsetof(struct ip, ip_src), 1028 sizeof (struct in_addr), 1029 &spidx->src.sin.sin_addr); 1030 m_copydata(m, offsetof(struct ip, ip_dst), 1031 sizeof (struct in_addr), 1032 &spidx->dst.sin.sin_addr); 1033 } else { 1034 struct ip *ip = mtod(m, struct ip *); 1035 spidx->src.sin.sin_addr = ip->ip_src; 1036 spidx->dst.sin.sin_addr = ip->ip_dst; 1037 } 1038 1039 spidx->prefs = sizeof(struct in_addr) << 3; 1040 spidx->prefd = sizeof(struct in_addr) << 3; 1041 1042 return 0; 1043 } 1044 1045 #ifdef INET6 1046 static void 1047 ipsec6_get_ulp(m, spidx, needport) 1048 struct mbuf *m; 1049 struct secpolicyindex *spidx; 1050 int needport; 1051 { 1052 int off, nxt; 1053 struct tcphdr th; 1054 struct udphdr uh; 1055 1056 /* sanity check */ 1057 if (m == NULL) 1058 panic("ipsec6_get_ulp: NULL pointer was passed"); 1059 1060 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1061 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 1062 1063 /* set default */ 1064 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1065 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1066 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1067 1068 nxt = -1; 1069 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1070 if (off < 0 || m->m_pkthdr.len < off) 1071 return; 1072 1073 switch (nxt) { 1074 case IPPROTO_TCP: 1075 spidx->ul_proto = nxt; 1076 if (!needport) 1077 break; 1078 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1079 break; 1080 m_copydata(m, off, sizeof(th), &th); 1081 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1082 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1083 break; 1084 case IPPROTO_UDP: 1085 spidx->ul_proto = nxt; 1086 if (!needport) 1087 break; 1088 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1089 break; 1090 m_copydata(m, off, sizeof(uh), &uh); 1091 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1092 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1093 break; 1094 case IPPROTO_ICMPV6: 1095 default: 1096 /* XXX intermediate headers??? */ 1097 spidx->ul_proto = nxt; 1098 break; 1099 } 1100 } 1101 1102 /* assumes that m is sane */ 1103 static int 1104 ipsec6_setspidx_ipaddr(m, spidx) 1105 struct mbuf *m; 1106 struct secpolicyindex *spidx; 1107 { 1108 struct ip6_hdr *ip6 = NULL; 1109 struct ip6_hdr ip6buf; 1110 struct sockaddr_in6 *sin6; 1111 1112 if (m->m_len >= sizeof(*ip6)) 1113 ip6 = mtod(m, struct ip6_hdr *); 1114 else { 1115 m_copydata(m, 0, sizeof(ip6buf), &ip6buf); 1116 ip6 = &ip6buf; 1117 } 1118 1119 sin6 = (struct sockaddr_in6 *)&spidx->src; 1120 bzero(sin6, sizeof(*sin6)); 1121 sin6->sin6_family = AF_INET6; 1122 sin6->sin6_len = sizeof(struct sockaddr_in6); 1123 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 1124 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1125 sin6->sin6_addr.s6_addr16[1] = 0; 1126 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1127 } 1128 spidx->prefs = sizeof(struct in6_addr) << 3; 1129 1130 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1131 bzero(sin6, sizeof(*sin6)); 1132 sin6->sin6_family = AF_INET6; 1133 sin6->sin6_len = sizeof(struct sockaddr_in6); 1134 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 1135 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1136 sin6->sin6_addr.s6_addr16[1] = 0; 1137 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1138 } 1139 spidx->prefd = sizeof(struct in6_addr) << 3; 1140 1141 return 0; 1142 } 1143 #endif 1144 1145 static void 1146 ipsec_delpcbpolicy(p) 1147 struct inpcbpolicy *p; 1148 { 1149 free(p, M_SECA); 1150 } 1151 1152 /* initialize policy in PCB */ 1153 int 1154 ipsec_init_policy(so, pcb_sp) 1155 struct socket *so; 1156 struct inpcbpolicy **pcb_sp; 1157 { 1158 struct inpcbpolicy *new; 1159 1160 /* sanity check. */ 1161 if (so == NULL || pcb_sp == NULL) 1162 panic("ipsec_init_policy: NULL pointer was passed"); 1163 1164 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 1165 M_SECA, M_NOWAIT|M_ZERO); 1166 if (new == NULL) { 1167 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 1168 return ENOBUFS; 1169 } 1170 1171 if (IPSEC_PRIVILEGED_SO(so)) 1172 new->priv = 1; 1173 else 1174 new->priv = 0; 1175 1176 if ((new->sp_in = KEY_NEWSP()) == NULL) { 1177 ipsec_delpcbpolicy(new); 1178 return ENOBUFS; 1179 } 1180 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 1181 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 1182 1183 if ((new->sp_out = KEY_NEWSP()) == NULL) { 1184 KEY_FREESP(&new->sp_in); 1185 ipsec_delpcbpolicy(new); 1186 return ENOBUFS; 1187 } 1188 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 1189 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 1190 1191 *pcb_sp = new; 1192 1193 return 0; 1194 } 1195 1196 /* copy old ipsec policy into new */ 1197 int 1198 ipsec_copy_policy(old, new) 1199 struct inpcbpolicy *old, *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(src) 1225 struct secpolicy *src; 1226 { 1227 struct ipsecrequest *newchain = NULL; 1228 struct ipsecrequest *p; 1229 struct ipsecrequest **q; 1230 struct ipsecrequest *r; 1231 struct secpolicy *dst; 1232 1233 if (src == NULL) 1234 return NULL; 1235 dst = KEY_NEWSP(); 1236 if (dst == NULL) 1237 return NULL; 1238 1239 /* 1240 * deep-copy IPsec request chain. This is required since struct 1241 * ipsecrequest is not reference counted. 1242 */ 1243 q = &newchain; 1244 for (p = src->req; p; p = p->next) { 1245 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest), 1246 M_SECA, M_NOWAIT); 1247 if (*q == NULL) 1248 goto fail; 1249 bzero(*q, sizeof(**q)); 1250 (*q)->next = NULL; 1251 1252 (*q)->saidx.proto = p->saidx.proto; 1253 (*q)->saidx.mode = p->saidx.mode; 1254 (*q)->level = p->level; 1255 (*q)->saidx.reqid = p->saidx.reqid; 1256 1257 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1258 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1259 1260 (*q)->sav = NULL; 1261 (*q)->sp = dst; 1262 1263 q = &((*q)->next); 1264 } 1265 1266 dst->req = newchain; 1267 dst->state = src->state; 1268 dst->policy = src->policy; 1269 /* do not touch the refcnt fields */ 1270 1271 return dst; 1272 1273 fail: 1274 for (p = newchain; p; p = r) { 1275 r = p->next; 1276 free(p, M_SECA); 1277 p = NULL; 1278 } 1279 return NULL; 1280 } 1281 1282 /* set policy and ipsec request if present. */ 1283 static int 1284 ipsec_set_policy( 1285 struct secpolicy **pcb_sp, 1286 int optname, 1287 void *request, 1288 size_t len, 1289 int priv 1290 ) 1291 { 1292 struct sadb_x_policy *xpl; 1293 struct secpolicy *newsp = NULL; 1294 int error; 1295 1296 /* sanity check. */ 1297 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1298 return EINVAL; 1299 if (len < sizeof(*xpl)) 1300 return EINVAL; 1301 xpl = (struct sadb_x_policy *)request; 1302 1303 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1304 printf("ipsec_set_policy: passed policy\n"); 1305 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1306 1307 /* check policy type */ 1308 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1309 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1310 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1311 return EINVAL; 1312 1313 /* check privileged socket */ 1314 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1315 return EACCES; 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(pcb_sp); 1325 *pcb_sp = 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(pcb_sp, mp) 1335 struct secpolicy *pcb_sp; 1336 struct mbuf **mp; 1337 { 1338 1339 /* sanity check. */ 1340 if (pcb_sp == NULL || mp == NULL) 1341 return EINVAL; 1342 1343 *mp = key_sp2msg(pcb_sp); 1344 if (!*mp) { 1345 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1346 return ENOBUFS; 1347 } 1348 1349 (*mp)->m_type = MT_DATA; 1350 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1351 printf("ipsec_get_policy:\n"); 1352 kdebug_mbuf(*mp)); 1353 1354 return 0; 1355 } 1356 1357 int 1358 ipsec4_set_policy(inp, optname, request, len, priv) 1359 struct inpcb *inp; 1360 int optname; 1361 void *request; 1362 size_t len; 1363 int priv; 1364 { 1365 struct sadb_x_policy *xpl; 1366 struct secpolicy **pcb_sp; 1367 1368 /* sanity check. */ 1369 if (inp == NULL || request == NULL) 1370 return EINVAL; 1371 if (len < sizeof(*xpl)) 1372 return EINVAL; 1373 xpl = (struct sadb_x_policy *)request; 1374 1375 IPSEC_ASSERT(inp->inp_sp != NULL, 1376 ("ipsec4_set_policy(): null inp->in_sp")); 1377 1378 /* select direction */ 1379 switch (xpl->sadb_x_policy_dir) { 1380 case IPSEC_DIR_INBOUND: 1381 pcb_sp = &inp->inp_sp->sp_in; 1382 break; 1383 case IPSEC_DIR_OUTBOUND: 1384 pcb_sp = &inp->inp_sp->sp_out; 1385 break; 1386 default: 1387 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1388 xpl->sadb_x_policy_dir)); 1389 return EINVAL; 1390 } 1391 1392 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1393 } 1394 1395 int 1396 ipsec4_get_policy(inp, request, len, mp) 1397 struct inpcb *inp; 1398 void *request; 1399 size_t len; 1400 struct mbuf **mp; 1401 { 1402 struct sadb_x_policy *xpl; 1403 struct secpolicy *pcb_sp; 1404 1405 /* sanity check. */ 1406 if (inp == NULL || request == NULL || mp == NULL) 1407 return EINVAL; 1408 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1409 if (len < sizeof(*xpl)) 1410 return EINVAL; 1411 xpl = (struct sadb_x_policy *)request; 1412 1413 /* select direction */ 1414 switch (xpl->sadb_x_policy_dir) { 1415 case IPSEC_DIR_INBOUND: 1416 pcb_sp = inp->inp_sp->sp_in; 1417 break; 1418 case IPSEC_DIR_OUTBOUND: 1419 pcb_sp = inp->inp_sp->sp_out; 1420 break; 1421 default: 1422 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1423 xpl->sadb_x_policy_dir)); 1424 return EINVAL; 1425 } 1426 1427 return ipsec_get_policy(pcb_sp, mp); 1428 } 1429 1430 /* delete policy in PCB */ 1431 int 1432 ipsec4_delete_pcbpolicy(inp) 1433 struct inpcb *inp; 1434 { 1435 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1436 1437 if (inp->inp_sp == NULL) 1438 return 0; 1439 1440 if (inp->inp_sp->sp_in != NULL) 1441 KEY_FREESP(&inp->inp_sp->sp_in); 1442 1443 if (inp->inp_sp->sp_out != NULL) 1444 KEY_FREESP(&inp->inp_sp->sp_out); 1445 1446 ipsec_delpcbpolicy(inp->inp_sp); 1447 inp->inp_sp = NULL; 1448 1449 return 0; 1450 } 1451 1452 #ifdef INET6 1453 int 1454 ipsec6_set_policy(in6p, optname, request, len, priv) 1455 struct in6pcb *in6p; 1456 int optname; 1457 void *request; 1458 size_t len; 1459 int priv; 1460 { 1461 struct sadb_x_policy *xpl; 1462 struct secpolicy **pcb_sp; 1463 1464 /* sanity check. */ 1465 if (in6p == NULL || request == NULL) 1466 return EINVAL; 1467 if (len < sizeof(*xpl)) 1468 return EINVAL; 1469 xpl = (struct sadb_x_policy *)request; 1470 1471 /* select direction */ 1472 switch (xpl->sadb_x_policy_dir) { 1473 case IPSEC_DIR_INBOUND: 1474 pcb_sp = &in6p->in6p_sp->sp_in; 1475 break; 1476 case IPSEC_DIR_OUTBOUND: 1477 pcb_sp = &in6p->in6p_sp->sp_out; 1478 break; 1479 default: 1480 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1481 xpl->sadb_x_policy_dir)); 1482 return EINVAL; 1483 } 1484 1485 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1486 } 1487 1488 int 1489 ipsec6_get_policy(in6p, request, len, mp) 1490 struct in6pcb *in6p; 1491 void *request; 1492 size_t len; 1493 struct mbuf **mp; 1494 { 1495 struct sadb_x_policy *xpl; 1496 struct secpolicy *pcb_sp; 1497 1498 /* sanity check. */ 1499 if (in6p == NULL || request == NULL || mp == NULL) 1500 return EINVAL; 1501 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1502 if (len < sizeof(*xpl)) 1503 return EINVAL; 1504 xpl = (struct sadb_x_policy *)request; 1505 1506 /* select direction */ 1507 switch (xpl->sadb_x_policy_dir) { 1508 case IPSEC_DIR_INBOUND: 1509 pcb_sp = in6p->in6p_sp->sp_in; 1510 break; 1511 case IPSEC_DIR_OUTBOUND: 1512 pcb_sp = in6p->in6p_sp->sp_out; 1513 break; 1514 default: 1515 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1516 xpl->sadb_x_policy_dir)); 1517 return EINVAL; 1518 } 1519 1520 return ipsec_get_policy(pcb_sp, mp); 1521 } 1522 1523 int 1524 ipsec6_delete_pcbpolicy(in6p) 1525 struct in6pcb *in6p; 1526 { 1527 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1528 1529 if (in6p->in6p_sp == NULL) 1530 return 0; 1531 1532 if (in6p->in6p_sp->sp_in != NULL) 1533 KEY_FREESP(&in6p->in6p_sp->sp_in); 1534 1535 if (in6p->in6p_sp->sp_out != NULL) 1536 KEY_FREESP(&in6p->in6p_sp->sp_out); 1537 1538 ipsec_delpcbpolicy(in6p->in6p_sp); 1539 in6p->in6p_sp = NULL; 1540 1541 return 0; 1542 } 1543 #endif 1544 1545 /* 1546 * return current level. 1547 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1548 */ 1549 u_int 1550 ipsec_get_reqlevel(isr) 1551 struct ipsecrequest *isr; 1552 { 1553 u_int level = 0; 1554 u_int esp_trans_deflev, esp_net_deflev; 1555 u_int ah_trans_deflev, ah_net_deflev; 1556 1557 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1558 ("ipsec_get_reqlevel: null argument")); 1559 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1560 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1561 isr->sp->spidx.src.sa.sa_family, 1562 isr->sp->spidx.dst.sa.sa_family)); 1563 1564 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1565 #define IPSEC_CHECK_DEFAULT(lev) \ 1566 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1567 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1568 ? (ipsec_debug \ 1569 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1570 (lev), IPSEC_LEVEL_REQUIRE) \ 1571 : 0), \ 1572 (lev) = IPSEC_LEVEL_REQUIRE, \ 1573 (lev) \ 1574 : (lev)) 1575 1576 /* set default level */ 1577 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1578 #ifdef INET 1579 case AF_INET: 1580 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1581 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1582 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1583 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1584 break; 1585 #endif 1586 #ifdef INET6 1587 case AF_INET6: 1588 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1589 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1590 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1591 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1592 break; 1593 #endif /* INET6 */ 1594 default: 1595 panic("key_get_reqlevel: unknown af %u", 1596 isr->sp->spidx.src.sa.sa_family); 1597 } 1598 1599 #undef IPSEC_CHECK_DEFAULT 1600 1601 /* set level */ 1602 switch (isr->level) { 1603 case IPSEC_LEVEL_DEFAULT: 1604 switch (isr->saidx.proto) { 1605 case IPPROTO_ESP: 1606 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1607 level = esp_net_deflev; 1608 else 1609 level = esp_trans_deflev; 1610 break; 1611 case IPPROTO_AH: 1612 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1613 level = ah_net_deflev; 1614 else 1615 level = ah_trans_deflev; 1616 break; 1617 case IPPROTO_IPCOMP: 1618 /* 1619 * we don't really care, as IPcomp document says that 1620 * we shouldn't compress small packets 1621 */ 1622 level = IPSEC_LEVEL_USE; 1623 break; 1624 default: 1625 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1626 isr->saidx.proto); 1627 } 1628 break; 1629 1630 case IPSEC_LEVEL_USE: 1631 case IPSEC_LEVEL_REQUIRE: 1632 level = isr->level; 1633 break; 1634 case IPSEC_LEVEL_UNIQUE: 1635 level = IPSEC_LEVEL_REQUIRE; 1636 break; 1637 1638 default: 1639 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1640 isr->level); 1641 } 1642 1643 return level; 1644 } 1645 1646 /* 1647 * Check security policy requirements against the actual 1648 * packet contents. Return one if the packet should be 1649 * reject as "invalid"; otherwiser return zero to have the 1650 * packet treated as "valid". 1651 * 1652 * OUT: 1653 * 0: valid 1654 * 1: invalid 1655 */ 1656 int 1657 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1658 { 1659 struct ipsecrequest *isr; 1660 int need_auth; 1661 1662 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1663 printf("ipsec_in_reject: using SP\n"); 1664 kdebug_secpolicy(sp)); 1665 1666 /* check policy */ 1667 switch (sp->policy) { 1668 case IPSEC_POLICY_DISCARD: 1669 return 1; 1670 case IPSEC_POLICY_BYPASS: 1671 case IPSEC_POLICY_NONE: 1672 return 0; 1673 } 1674 1675 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1676 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1677 1678 /* XXX should compare policy against ipsec header history */ 1679 1680 need_auth = 0; 1681 for (isr = sp->req; isr != NULL; isr = isr->next) { 1682 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1683 continue; 1684 switch (isr->saidx.proto) { 1685 case IPPROTO_ESP: 1686 if ((m->m_flags & M_DECRYPTED) == 0) { 1687 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1688 printf("ipsec_in_reject: ESP m_flags:%x\n", 1689 m->m_flags)); 1690 return 1; 1691 } 1692 1693 if (!need_auth && 1694 isr->sav != NULL && 1695 isr->sav->tdb_authalgxform != NULL && 1696 (m->m_flags & M_AUTHIPDGM) == 0) { 1697 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1698 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1699 m->m_flags)); 1700 return 1; 1701 } 1702 break; 1703 case IPPROTO_AH: 1704 need_auth = 1; 1705 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1706 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1707 printf("ipsec_in_reject: AH m_flags:%x\n", 1708 m->m_flags)); 1709 return 1; 1710 } 1711 break; 1712 case IPPROTO_IPCOMP: 1713 /* 1714 * we don't really care, as IPcomp document 1715 * says that we shouldn't compress small 1716 * packets, IPComp policy should always be 1717 * treated as being in "use" level. 1718 */ 1719 break; 1720 } 1721 } 1722 return 0; /* valid */ 1723 } 1724 1725 /* 1726 * Check AH/ESP integrity. 1727 * This function is called from tcp_input(), udp_input(), 1728 * and {ah,esp}4_input for tunnel mode 1729 */ 1730 int 1731 ipsec4_in_reject(m, inp) 1732 struct mbuf *m; 1733 struct inpcb *inp; 1734 { 1735 struct secpolicy *sp; 1736 int error; 1737 int result; 1738 1739 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1740 1741 /* get SP for this packet. 1742 * When we are called from ip_forward(), we call 1743 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1744 */ 1745 if (inp == NULL) 1746 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1747 else 1748 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1749 IN4PCB_TO_PCB(inp), &error); 1750 1751 if (sp != NULL) { 1752 result = ipsec_in_reject(sp, m); 1753 if (result) 1754 newipsecstat.ips_in_polvio++; 1755 KEY_FREESP(&sp); 1756 } else { 1757 result = 0; /* XXX should be panic ? 1758 * -> No, there may be error. */ 1759 } 1760 return result; 1761 } 1762 1763 1764 #ifdef INET6 1765 /* 1766 * Check AH/ESP integrity. 1767 * This function is called from tcp6_input(), udp6_input(), 1768 * and {ah,esp}6_input for tunnel mode 1769 */ 1770 int 1771 ipsec6_in_reject(m, in6p) 1772 struct mbuf *m; 1773 struct in6pcb *in6p; 1774 { 1775 struct secpolicy *sp = NULL; 1776 int error; 1777 int result; 1778 1779 /* sanity check */ 1780 if (m == NULL) 1781 return 0; /* XXX should be panic ? */ 1782 1783 /* get SP for this packet. 1784 * When we are called from ip_forward(), we call 1785 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1786 */ 1787 if (in6p == NULL) 1788 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1789 else 1790 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1791 IN6PCB_TO_PCB(in6p), 1792 &error); 1793 1794 if (sp != NULL) { 1795 result = ipsec_in_reject(sp, m); 1796 if (result) 1797 newipsecstat.ips_in_polvio++; 1798 KEY_FREESP(&sp); 1799 } else { 1800 result = 0; 1801 } 1802 return result; 1803 } 1804 #endif 1805 1806 /* 1807 * compute the byte size to be occupied by IPsec header. 1808 * in case it is tunneled, it includes the size of outer IP header. 1809 * NOTE: SP passed is free in this function. 1810 */ 1811 static size_t 1812 ipsec_hdrsiz(struct secpolicy *sp) 1813 { 1814 struct ipsecrequest *isr; 1815 size_t siz; 1816 1817 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1818 printf("ipsec_hdrsiz: using SP\n"); 1819 kdebug_secpolicy(sp)); 1820 1821 switch (sp->policy) { 1822 case IPSEC_POLICY_DISCARD: 1823 case IPSEC_POLICY_BYPASS: 1824 case IPSEC_POLICY_NONE: 1825 return 0; 1826 } 1827 1828 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1829 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1830 1831 siz = 0; 1832 for (isr = sp->req; isr != NULL; isr = isr->next) { 1833 size_t clen = 0; 1834 1835 switch (isr->saidx.proto) { 1836 case IPPROTO_ESP: 1837 clen = esp_hdrsiz(isr->sav); 1838 break; 1839 case IPPROTO_AH: 1840 clen = ah_hdrsiz(isr->sav); 1841 break; 1842 case IPPROTO_IPCOMP: 1843 clen = sizeof(struct ipcomp); 1844 break; 1845 } 1846 1847 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1848 switch (isr->saidx.dst.sa.sa_family) { 1849 case AF_INET: 1850 clen += sizeof(struct ip); 1851 break; 1852 #ifdef INET6 1853 case AF_INET6: 1854 clen += sizeof(struct ip6_hdr); 1855 break; 1856 #endif 1857 default: 1858 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1859 "unknown AF %d in IPsec tunnel SA\n", 1860 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1861 break; 1862 } 1863 } 1864 siz += clen; 1865 } 1866 1867 return siz; 1868 } 1869 1870 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1871 size_t 1872 ipsec4_hdrsiz(m, dir, inp) 1873 struct mbuf *m; 1874 u_int dir; 1875 struct inpcb *inp; 1876 { 1877 struct secpolicy *sp; 1878 int error; 1879 size_t size; 1880 1881 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1882 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1883 ("ipsec4_hdrsize: socket w/o inpcb")); 1884 1885 /* get SP for this packet. 1886 * When we are called from ip_forward(), we call 1887 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1888 */ 1889 if (inp == NULL) 1890 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1891 else 1892 sp = ipsec_getpolicybysock(m, dir, 1893 IN4PCB_TO_PCB(inp), &error); 1894 1895 if (sp != NULL) { 1896 size = ipsec_hdrsiz(sp); 1897 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1898 printf("ipsec4_hdrsiz: size:%lu.\n", 1899 (unsigned long)size)); 1900 1901 KEY_FREESP(&sp); 1902 } else { 1903 size = 0; /* XXX should be panic ? */ 1904 } 1905 return size; 1906 } 1907 1908 #ifdef INET6 1909 /* This function is called from ipsec6_hdrsize_tcp(), 1910 * and maybe from ip6_forward.() 1911 */ 1912 size_t 1913 ipsec6_hdrsiz(m, dir, in6p) 1914 struct mbuf *m; 1915 u_int dir; 1916 struct in6pcb *in6p; 1917 { 1918 struct secpolicy *sp; 1919 int error; 1920 size_t size; 1921 1922 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1923 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1924 ("ipsec6_hdrsize: socket w/o inpcb")); 1925 1926 /* get SP for this packet */ 1927 /* XXX Is it right to call with IP_FORWARDING. */ 1928 if (in6p == NULL) 1929 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1930 else 1931 sp = ipsec_getpolicybysock(m, dir, 1932 IN6PCB_TO_PCB(in6p), 1933 &error); 1934 1935 if (sp == NULL) 1936 return 0; 1937 size = ipsec_hdrsiz(sp); 1938 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1939 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1940 KEY_FREESP(&sp); 1941 1942 return size; 1943 } 1944 #endif /*INET6*/ 1945 1946 /* 1947 * Check the variable replay window. 1948 * ipsec_chkreplay() performs replay check before ICV verification. 1949 * ipsec_updatereplay() updates replay bitmap. This must be called after 1950 * ICV verification (it also performs replay check, which is usually done 1951 * beforehand). 1952 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1953 * 1954 * based on RFC 2401. 1955 */ 1956 int 1957 ipsec_chkreplay(seq, sav) 1958 u_int32_t seq; 1959 struct secasvar *sav; 1960 { 1961 const struct secreplay *replay; 1962 u_int32_t diff; 1963 int fr; 1964 u_int32_t wsizeb; /* constant: bits of window size */ 1965 int frlast; /* constant: last frame */ 1966 1967 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 1968 1969 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1970 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1971 1972 replay = sav->replay; 1973 1974 if (replay->wsize == 0) 1975 return 1; /* no need to check replay. */ 1976 1977 /* constant */ 1978 frlast = replay->wsize - 1; 1979 wsizeb = replay->wsize << 3; 1980 1981 /* sequence number of 0 is invalid */ 1982 if (seq == 0) 1983 return 0; 1984 1985 /* first time is always okay */ 1986 if (replay->count == 0) 1987 return 1; 1988 1989 if (seq > replay->lastseq) { 1990 /* larger sequences are okay */ 1991 return 1; 1992 } else { 1993 /* seq is equal or less than lastseq. */ 1994 diff = replay->lastseq - seq; 1995 1996 /* over range to check, i.e. too old or wrapped */ 1997 if (diff >= wsizeb) 1998 return 0; 1999 2000 fr = frlast - diff / 8; 2001 2002 /* this packet already seen ? */ 2003 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2004 return 0; 2005 2006 /* out of order but good */ 2007 return 1; 2008 } 2009 } 2010 2011 /* 2012 * check replay counter whether to update or not. 2013 * OUT: 0: OK 2014 * 1: NG 2015 */ 2016 int 2017 ipsec_updatereplay(seq, sav) 2018 u_int32_t seq; 2019 struct secasvar *sav; 2020 { 2021 struct secreplay *replay; 2022 u_int32_t diff; 2023 int fr; 2024 u_int32_t wsizeb; /* constant: bits of window size */ 2025 int frlast; /* constant: last frame */ 2026 2027 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 2028 2029 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 2030 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 2031 2032 replay = sav->replay; 2033 2034 if (replay->wsize == 0) 2035 goto ok; /* no need to check replay. */ 2036 2037 /* constant */ 2038 frlast = replay->wsize - 1; 2039 wsizeb = replay->wsize << 3; 2040 2041 /* sequence number of 0 is invalid */ 2042 if (seq == 0) 2043 return 1; 2044 2045 /* first time */ 2046 if (replay->count == 0) { 2047 replay->lastseq = seq; 2048 bzero(replay->bitmap, replay->wsize); 2049 (replay->bitmap)[frlast] = 1; 2050 goto ok; 2051 } 2052 2053 if (seq > replay->lastseq) { 2054 /* seq is larger than lastseq. */ 2055 diff = seq - replay->lastseq; 2056 2057 /* new larger sequence number */ 2058 if (diff < wsizeb) { 2059 /* In window */ 2060 /* set bit for this packet */ 2061 vshiftl(replay->bitmap, diff, replay->wsize); 2062 (replay->bitmap)[frlast] |= 1; 2063 } else { 2064 /* this packet has a "way larger" */ 2065 bzero(replay->bitmap, replay->wsize); 2066 (replay->bitmap)[frlast] = 1; 2067 } 2068 replay->lastseq = seq; 2069 2070 /* larger is good */ 2071 } else { 2072 /* seq is equal or less than lastseq. */ 2073 diff = replay->lastseq - seq; 2074 2075 /* over range to check, i.e. too old or wrapped */ 2076 if (diff >= wsizeb) 2077 return 1; 2078 2079 fr = frlast - diff / 8; 2080 2081 /* this packet already seen ? */ 2082 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2083 return 1; 2084 2085 /* mark as seen */ 2086 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2087 2088 /* out of order but good */ 2089 } 2090 2091 ok: 2092 if (replay->count == ~0) { 2093 2094 /* set overflow flag */ 2095 replay->overflow++; 2096 2097 /* don't increment, no more packets accepted */ 2098 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2099 return 1; 2100 2101 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2102 replay->overflow, ipsec_logsastr(sav))); 2103 } 2104 2105 replay->count++; 2106 2107 return 0; 2108 } 2109 2110 /* 2111 * shift variable length bunffer to left. 2112 * IN: bitmap: pointer to the buffer 2113 * nbit: the number of to shift. 2114 * wsize: buffer size (bytes). 2115 */ 2116 static void 2117 vshiftl(bitmap, nbit, wsize) 2118 unsigned char *bitmap; 2119 int nbit, wsize; 2120 { 2121 int s, j, i; 2122 unsigned char over; 2123 2124 for (j = 0; j < nbit; j += 8) { 2125 s = (nbit - j < 8) ? (nbit - j): 8; 2126 bitmap[0] <<= s; 2127 for (i = 1; i < wsize; i++) { 2128 over = (bitmap[i] >> (8 - s)); 2129 bitmap[i] <<= s; 2130 bitmap[i-1] |= over; 2131 } 2132 } 2133 2134 return; 2135 } 2136 2137 /* Return a printable string for the IPv4 address. */ 2138 static char * 2139 inet_ntoa4(struct in_addr ina) 2140 { 2141 static char buf[4][4 * sizeof "123" + 4]; 2142 unsigned char *ucp = (unsigned char *) &ina; 2143 static int i = 3; 2144 2145 i = (i + 1) % 4; 2146 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2147 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2148 return (buf[i]); 2149 } 2150 2151 /* Return a printable string for the address. */ 2152 const char * 2153 ipsec_address(union sockaddr_union* sa) 2154 { 2155 switch (sa->sa.sa_family) { 2156 #if INET 2157 case AF_INET: 2158 return inet_ntoa4(sa->sin.sin_addr); 2159 #endif /* INET */ 2160 2161 #if INET6 2162 case AF_INET6: 2163 return ip6_sprintf(&sa->sin6.sin6_addr); 2164 #endif /* INET6 */ 2165 2166 default: 2167 return "(unknown address family)"; 2168 } 2169 } 2170 2171 const char * 2172 ipsec_logsastr(sav) 2173 struct secasvar *sav; 2174 { 2175 static char buf[256]; 2176 char *p; 2177 struct secasindex *saidx = &sav->sah->saidx; 2178 2179 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2180 ("ipsec_logsastr: address family mismatch")); 2181 2182 p = buf; 2183 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2184 while (p && *p) 2185 p++; 2186 /* NB: only use ipsec_address on one address at a time */ 2187 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2188 ipsec_address(&saidx->src)); 2189 while (p && *p) 2190 p++; 2191 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2192 ipsec_address(&saidx->dst)); 2193 2194 return buf; 2195 } 2196 2197 void 2198 ipsec_dumpmbuf(m) 2199 struct mbuf *m; 2200 { 2201 int totlen; 2202 int i; 2203 u_char *p; 2204 2205 totlen = 0; 2206 printf("---\n"); 2207 while (m) { 2208 p = mtod(m, u_char *); 2209 for (i = 0; i < m->m_len; i++) { 2210 printf("%02x ", p[i]); 2211 totlen++; 2212 if (totlen % 16 == 0) 2213 printf("\n"); 2214 } 2215 m = m->m_next; 2216 } 2217 if (totlen % 16 != 0) 2218 printf("\n"); 2219 printf("---\n"); 2220 } 2221 2222 #ifdef INET6 2223 struct secpolicy * 2224 ipsec6_check_policy(m,so,flags,needipsecp,errorp) 2225 struct mbuf * m; 2226 const struct socket * so; 2227 int flags; 2228 int * needipsecp; 2229 int * errorp; 2230 { 2231 struct in6pcb *in6p = NULL; 2232 struct m_tag *mtag; 2233 struct secpolicy *sp = NULL; 2234 struct tdb_ident *tdbi; 2235 int s; 2236 int error = 0; 2237 int needipsec = 0; 2238 2239 if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6) 2240 in6p = sotoin6pcb(so); 2241 2242 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 2243 s = splsoftnet(); 2244 if (mtag != NULL) { 2245 tdbi = (struct tdb_ident *)(mtag + 1); 2246 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND); 2247 if (sp == NULL) 2248 error = -EINVAL; /* force silent drop */ 2249 m_tag_delete(m, mtag); 2250 } else { 2251 if (in6p != NULL && 2252 IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) 2253 goto skippolicycheck; 2254 sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p); 2255 } 2256 2257 /* 2258 * There are four return cases: 2259 * sp != NULL apply IPsec policy 2260 * sp == NULL, error == 0 no IPsec handling needed 2261 * sp == NULL, error == -EINVAL discard packet w/o error 2262 * sp == NULL, error != 0 discard packet, report error 2263 */ 2264 2265 if (sp == NULL) { 2266 splx(s); 2267 2268 if (error != 0) { 2269 needipsec = 0; 2270 } else { 2271 /* No IPsec processing for this packet. */ 2272 needipsec = 0; 2273 } 2274 } else { 2275 /* Loop detection, check if ipsec processing already done */ 2276 IPSEC_ASSERT(sp->req != NULL, ("ip6_output: no ipsec request")); 2277 for (mtag = m_tag_first(m); mtag != NULL; 2278 mtag = m_tag_next(m, mtag)) { 2279 #ifdef MTAG_ABI_COMPAT 2280 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT) 2281 continue; 2282 #endif 2283 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE && 2284 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED) 2285 continue; 2286 /* 2287 * Check if policy has an SA associated with it. 2288 * This can happen when an SP has yet to acquire 2289 * an SA; e.g. on first reference. If it occurs, 2290 * then we let ipsec4_process_packet do its thing. 2291 */ 2292 if (sp->req->sav == NULL) 2293 break; 2294 tdbi = (struct tdb_ident *)(mtag + 1); 2295 if (tdbi->spi == sp->req->sav->spi && 2296 tdbi->proto == sp->req->sav->sah->saidx.proto && 2297 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst, 2298 sizeof (union sockaddr_union)) == 0) { 2299 /* 2300 * No IPsec processing is needed, free 2301 * reference to SP. 2302 * 2303 * NB: null pointer to avoid free at 2304 * done: below. 2305 */ 2306 KEY_FREESP(&sp), sp = NULL; 2307 needipsec = 0; 2308 splx(s); 2309 goto skippolicycheck; 2310 } 2311 } 2312 splx(s); 2313 needipsec = 1; 2314 } 2315 skippolicycheck:; 2316 2317 *errorp = error; 2318 *needipsecp = needipsec; 2319 return sp; 2320 } 2321 #endif 2322 2323 2324 2325 /* XXX this stuff doesn't belong here... */ 2326 2327 static struct xformsw* xforms = NULL; 2328 2329 /* 2330 * Register a transform; typically at system startup. 2331 */ 2332 void 2333 xform_register(struct xformsw* xsp) 2334 { 2335 xsp->xf_next = xforms; 2336 xforms = xsp; 2337 } 2338 2339 /* 2340 * Initialize transform support in an sav. 2341 */ 2342 int 2343 xform_init(struct secasvar *sav, int xftype) 2344 { 2345 struct xformsw *xsp; 2346 2347 if (sav->tdb_xform != NULL) /* previously initialized */ 2348 return 0; 2349 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2350 if (xsp->xf_type == xftype) 2351 return (*xsp->xf_init)(sav, xsp); 2352 2353 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2354 return EINVAL; 2355 } 2356 2357 #ifdef __NetBSD__ 2358 void 2359 ipsec_attach(void) 2360 { 2361 printf("initializing IPsec..."); 2362 ah_attach(); 2363 esp_attach(); 2364 ipcomp_attach(); 2365 ipe4_attach(); 2366 #ifdef TCP_SIGNATURE 2367 tcpsignature_attach(); 2368 #endif 2369 printf(" done\n"); 2370 } 2371 #endif /* __NetBSD__ */ 2372
Indexes created Sun Sep 21 20:09:37 GMT 2025