Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/ipsec.c
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1 /* $NetBSD: ipsec.c,v 1.25.2.3 2007/10/31 12:39:29 liamjfoy 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 1.25.2.3 2007/10/31 12:39:29 liamjfoy 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, caddr_t 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(int af, 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 switch(af) { 438 case AF_INET: 439 sp = &ip4_def_policy; 440 break; 441 #ifdef INET6 442 case AF_INET6: 443 sp = &ip6_def_policy; 444 break; 445 #endif 446 default: 447 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 448 printf("key_allocsp_default : unexpected protocol family %u\n", 449 af)); 450 return NULL; 451 } 452 453 if (sp->policy != IPSEC_POLICY_DISCARD && 454 sp->policy != IPSEC_POLICY_NONE) { 455 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 456 sp->policy, IPSEC_POLICY_NONE)); 457 sp->policy = IPSEC_POLICY_NONE; 458 } 459 sp->refcnt++; 460 461 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 462 printf("DP key_allocsp_default returns SP:%p (%u)\n", 463 sp, sp->refcnt)); 464 return sp; 465 } 466 #define KEY_ALLOCSP_DEFAULT(af) \ 467 key_allocsp_default((af),__FILE__, __LINE__) 468 469 /* 470 * For OUTBOUND packet having a socket. Searching SPD for packet, 471 * and return a pointer to SP. 472 * OUT: NULL: no apropreate SP found, the following value is set to error. 473 * 0 : bypass 474 * EACCES : discard packet. 475 * ENOENT : ipsec_acquire() in progress, maybe. 476 * others : error occurred. 477 * others: a pointer to SP 478 * 479 * NOTE: IPv6 mapped address concern is implemented here. 480 */ 481 struct secpolicy * 482 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 483 { 484 struct secpolicy *sp; 485 486 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 487 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 488 ("ipsec_getpolicy: invalid direction %u", dir)); 489 490 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 491 if (sp == NULL) /*XXX????*/ 492 sp = KEY_ALLOCSP_DEFAULT(tdbi->dst.sa.sa_family); 493 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 494 return sp; 495 } 496 497 /* 498 * For OUTBOUND packet having a socket. Searching SPD for packet, 499 * and return a pointer to SP. 500 * OUT: NULL: no apropreate SP found, the following value is set to error. 501 * 0 : bypass 502 * EACCES : discard packet. 503 * ENOENT : ipsec_acquire() in progress, maybe. 504 * others : error occurred. 505 * others: a pointer to SP 506 * 507 * NOTE: IPv6 mapped address concern is implemented here. 508 */ 509 static struct secpolicy * 510 ipsec_getpolicybysock(m, dir, inp, error) 511 struct mbuf *m; 512 u_int dir; 513 PCB_T *inp; 514 int *error; 515 { 516 struct inpcbpolicy *pcbsp = NULL; 517 struct secpolicy *currsp = NULL; /* policy on socket */ 518 struct secpolicy *sp; 519 int af; 520 521 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 522 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 523 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 524 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 525 ("ipsec_getpolicybysock: invalid direction %u", dir)); 526 527 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, 528 ("ipsec_getppolicybysock: null socket\n")); 529 530 /* XXX FIXME inpcb/in6pcb vs socket*/ 531 af = PCB_FAMILY(inp); 532 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 533 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 534 535 #ifdef __NetBSD__ 536 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache")); 537 /* If we have a cached entry, and if it is still valid, use it. */ 538 ipsecstat.ips_spdcache_lookup++; 539 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); 540 if (currsp) { 541 *error = 0; 542 return currsp; 543 } 544 ipsecstat.ips_spdcache_miss++; 545 #endif /* __NetBSD__ */ 546 547 switch (af) { 548 case AF_INET: { 549 struct inpcb *in4p = PCB_TO_IN4PCB(inp); 550 /* set spidx in pcb */ 551 *error = ipsec4_setspidx_inpcb(m, in4p); 552 pcbsp = in4p->inp_sp; 553 break; 554 } 555 556 #if defined(INET6) 557 case AF_INET6: { 558 struct in6pcb *in6p = PCB_TO_IN6PCB(inp); 559 /* set spidx in pcb */ 560 *error = ipsec6_setspidx_in6pcb(m, in6p); 561 pcbsp = in6p->in6p_sp; 562 break; 563 } 564 #endif 565 default: 566 *error = EPFNOSUPPORT; 567 break; 568 } 569 if (*error) 570 return NULL; 571 572 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 573 switch (dir) { 574 case IPSEC_DIR_INBOUND: 575 currsp = pcbsp->sp_in; 576 break; 577 case IPSEC_DIR_OUTBOUND: 578 currsp = pcbsp->sp_out; 579 break; 580 } 581 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 582 583 if (pcbsp->priv) { /* when privilieged socket */ 584 switch (currsp->policy) { 585 case IPSEC_POLICY_BYPASS: 586 case IPSEC_POLICY_IPSEC: 587 currsp->refcnt++; 588 sp = currsp; 589 break; 590 591 case IPSEC_POLICY_ENTRUST: 592 /* look for a policy in SPD */ 593 sp = KEY_ALLOCSP(&currsp->spidx, dir); 594 if (sp == NULL) /* no SP found */ 595 sp = KEY_ALLOCSP_DEFAULT(af); 596 break; 597 598 default: 599 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 600 "Invalid policy for PCB %d\n", currsp->policy)); 601 *error = EINVAL; 602 return NULL; 603 } 604 } else { /* unpriv, SPD has policy */ 605 sp = KEY_ALLOCSP(&currsp->spidx, dir); 606 if (sp == NULL) { /* no SP found */ 607 switch (currsp->policy) { 608 case IPSEC_POLICY_BYPASS: 609 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 610 "Illegal policy for non-priviliged defined %d\n", 611 currsp->policy)); 612 *error = EINVAL; 613 return NULL; 614 615 case IPSEC_POLICY_ENTRUST: 616 sp = KEY_ALLOCSP_DEFAULT(af); 617 break; 618 619 case IPSEC_POLICY_IPSEC: 620 currsp->refcnt++; 621 sp = currsp; 622 break; 623 624 default: 625 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 626 "Invalid policy for PCB %d\n", currsp->policy)); 627 *error = EINVAL; 628 return NULL; 629 } 630 } 631 } 632 IPSEC_ASSERT(sp != NULL, 633 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 634 pcbsp->priv, currsp->policy)); 635 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 636 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 637 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 638 sp, sp->refcnt)); 639 #ifdef __NetBSD__ 640 ipsec_fillpcbcache(pcbsp, m, sp, dir); 641 #endif /* __NetBSD__ */ 642 return sp; 643 } 644 645 /* 646 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 647 * and return a pointer to SP. 648 * OUT: positive: a pointer to the entry for security policy leaf matched. 649 * NULL: no apropreate SP found, the following value is set to error. 650 * 0 : bypass 651 * EACCES : discard packet. 652 * ENOENT : ipsec_acquire() in progress, maybe. 653 * others : error occurred. 654 */ 655 struct secpolicy * 656 ipsec_getpolicybyaddr(m, dir, flag, error) 657 struct mbuf *m; 658 u_int dir; 659 int flag; 660 int *error; 661 { 662 struct secpolicyindex spidx; 663 struct secpolicy *sp; 664 665 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 666 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 667 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 668 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 669 670 sp = NULL; 671 672 /* Make an index to look for a policy. */ 673 *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1); 674 if (*error != 0) { 675 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 676 " dir %u flag %u\n", dir, flag)); 677 bzero(&spidx, sizeof (spidx)); 678 return NULL; 679 } 680 681 spidx.dir = dir; 682 683 if (key_havesp(dir)) { 684 sp = KEY_ALLOCSP(&spidx, dir); 685 } 686 687 if (sp == NULL) /* no SP found, use system default */ 688 sp = KEY_ALLOCSP_DEFAULT(spidx.dst.sa.sa_family); 689 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 690 return sp; 691 } 692 693 struct secpolicy * 694 ipsec4_checkpolicy(m, dir, flag, error, inp) 695 struct mbuf *m; 696 u_int dir, flag; 697 int *error; 698 struct inpcb *inp; 699 { 700 struct secpolicy *sp; 701 702 *error = 0; 703 704 705 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 706 if (inp == NULL || inp->inp_socket == NULL) { 707 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 708 } else 709 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); 710 if (sp == NULL) { 711 IPSEC_ASSERT(*error != 0, 712 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 713 newipsecstat.ips_out_inval++; 714 return NULL; 715 } 716 IPSEC_ASSERT(*error == 0, 717 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 718 switch (sp->policy) { 719 case IPSEC_POLICY_ENTRUST: 720 default: 721 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 722 /* fall thru... */ 723 case IPSEC_POLICY_DISCARD: 724 newipsecstat.ips_out_polvio++; 725 *error = -EINVAL; /* packet is discarded by caller */ 726 break; 727 case IPSEC_POLICY_BYPASS: 728 case IPSEC_POLICY_NONE: 729 KEY_FREESP(&sp); 730 sp = NULL; /* NB: force NULL result */ 731 break; 732 case IPSEC_POLICY_IPSEC: 733 if (sp->req == NULL) /* acquire an SA */ 734 *error = key_spdacquire(sp); 735 break; 736 } 737 if (*error != 0) { 738 KEY_FREESP(&sp); 739 sp = NULL; 740 } 741 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 742 return sp; 743 } 744 745 #ifdef INET6 746 struct secpolicy * 747 ipsec6_checkpolicy(m, dir, flag, error, in6p) 748 struct mbuf *m; 749 u_int dir, flag; 750 int *error; 751 struct in6pcb *in6p; 752 { 753 struct secpolicy *sp; 754 755 *error = 0; 756 757 758 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 759 if (in6p == NULL || in6p->in6p_socket == NULL) { 760 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 761 } else 762 sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error); 763 if (sp == NULL) { 764 IPSEC_ASSERT(*error != 0, 765 ("ipsec6_checkpolicy: getpolicy failed w/o error")); 766 newipsecstat.ips_out_inval++; 767 return NULL; 768 } 769 IPSEC_ASSERT(*error == 0, 770 ("ipsec6_checkpolicy: sp w/ error set to %u", *error)); 771 switch (sp->policy) { 772 case IPSEC_POLICY_ENTRUST: 773 default: 774 printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy); 775 /* fall thru... */ 776 case IPSEC_POLICY_DISCARD: 777 newipsecstat.ips_out_polvio++; 778 *error = -EINVAL; /* packet is discarded by caller */ 779 break; 780 case IPSEC_POLICY_BYPASS: 781 case IPSEC_POLICY_NONE: 782 KEY_FREESP(&sp); 783 sp = NULL; /* NB: force NULL result */ 784 break; 785 case IPSEC_POLICY_IPSEC: 786 if (sp->req == NULL) /* acquire an SA */ 787 *error = key_spdacquire(sp); 788 break; 789 } 790 if (*error != 0) { 791 KEY_FREESP(&sp); 792 sp = NULL; 793 } 794 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 795 return sp; 796 } 797 #endif /* INET6 */ 798 799 static int 800 ipsec4_setspidx_inpcb(m, pcb) 801 struct mbuf *m; 802 struct inpcb *pcb; 803 { 804 int error; 805 806 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 807 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 808 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 809 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 810 811 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 812 if (error == 0) { 813 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 814 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 815 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 816 } else { 817 bzero(&pcb->inp_sp->sp_in->spidx, 818 sizeof (pcb->inp_sp->sp_in->spidx)); 819 bzero(&pcb->inp_sp->sp_out->spidx, 820 sizeof (pcb->inp_sp->sp_in->spidx)); 821 } 822 return error; 823 } 824 825 #ifdef INET6 826 static int 827 ipsec6_setspidx_in6pcb(m, pcb) 828 struct mbuf *m; 829 struct in6pcb *pcb; 830 { 831 struct secpolicyindex *spidx; 832 int error; 833 834 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 835 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 836 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 837 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 838 839 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 840 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 841 842 spidx = &pcb->in6p_sp->sp_in->spidx; 843 error = ipsec_setspidx(m, spidx, 1); 844 if (error) 845 goto bad; 846 spidx->dir = IPSEC_DIR_INBOUND; 847 848 spidx = &pcb->in6p_sp->sp_out->spidx; 849 error = ipsec_setspidx(m, spidx, 1); 850 if (error) 851 goto bad; 852 spidx->dir = IPSEC_DIR_OUTBOUND; 853 854 return 0; 855 856 bad: 857 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 858 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 859 return error; 860 } 861 #endif 862 863 /* 864 * configure security policy index (src/dst/proto/sport/dport) 865 * by looking at the content of mbuf. 866 * the caller is responsible for error recovery (like clearing up spidx). 867 */ 868 static int 869 ipsec_setspidx(m, spidx, needport) 870 struct mbuf *m; 871 struct secpolicyindex *spidx; 872 int needport; 873 { 874 struct ip *ip = NULL; 875 struct ip ipbuf; 876 u_int v; 877 struct mbuf *n; 878 int len; 879 int error; 880 881 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 882 883 /* 884 * validate m->m_pkthdr.len. we see incorrect length if we 885 * mistakenly call this function with inconsistent mbuf chain 886 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 887 */ 888 len = 0; 889 for (n = m; n; n = n->m_next) 890 len += n->m_len; 891 if (m->m_pkthdr.len != len) { 892 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 893 printf("ipsec_setspidx: " 894 "total of m_len(%d) != pkthdr.len(%d), " 895 "ignored.\n", 896 len, m->m_pkthdr.len)); 897 return EINVAL; 898 } 899 900 if (m->m_pkthdr.len < sizeof(struct ip)) { 901 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 902 printf("ipsec_setspidx: " 903 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 904 m->m_pkthdr.len)); 905 return EINVAL; 906 } 907 908 if (m->m_len >= sizeof(*ip)) 909 ip = mtod(m, struct ip *); 910 else { 911 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 912 ip = &ipbuf; 913 } 914 #ifdef _IP_VHL 915 v = _IP_VHL_V(ip->ip_vhl); 916 #else 917 v = ip->ip_v; 918 #endif 919 switch (v) { 920 case 4: 921 error = ipsec4_setspidx_ipaddr(m, spidx); 922 if (error) 923 return error; 924 ipsec4_get_ulp(m, spidx, needport); 925 return 0; 926 #ifdef INET6 927 case 6: 928 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 929 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 930 printf("ipsec_setspidx: " 931 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 932 "ignored.\n", m->m_pkthdr.len)); 933 return EINVAL; 934 } 935 error = ipsec6_setspidx_ipaddr(m, spidx); 936 if (error) 937 return error; 938 ipsec6_get_ulp(m, spidx, needport); 939 return 0; 940 #endif 941 default: 942 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 943 printf("ipsec_setspidx: " 944 "unknown IP version %u, ignored.\n", v)); 945 return EINVAL; 946 } 947 } 948 949 static void 950 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 951 { 952 u_int8_t nxt; 953 int off; 954 955 /* sanity check */ 956 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 957 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), 958 ("ipsec4_get_ulp: packet too short")); 959 960 /* NB: ip_input() flips it into host endian XXX need more checking */ 961 if (m->m_len >= sizeof(struct ip)) { 962 struct ip *ip = mtod(m, struct ip *); 963 if (ip->ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK)) 964 goto done; 965 #ifdef _IP_VHL 966 off = _IP_VHL_HL(ip->ip_vhl) << 2; 967 #else 968 off = ip->ip_hl << 2; 969 #endif 970 nxt = ip->ip_p; 971 } else { 972 struct ip ih; 973 974 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 975 if (ih.ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK)) 976 goto done; 977 #ifdef _IP_VHL 978 off = _IP_VHL_HL(ih.ip_vhl) << 2; 979 #else 980 off = ih.ip_hl << 2; 981 #endif 982 nxt = ih.ip_p; 983 } 984 985 while (off < m->m_pkthdr.len) { 986 struct ip6_ext ip6e; 987 struct tcphdr th; 988 struct udphdr uh; 989 990 switch (nxt) { 991 case IPPROTO_TCP: 992 spidx->ul_proto = nxt; 993 if (!needport) 994 goto done_proto; 995 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 996 goto done; 997 m_copydata(m, off, sizeof (th), (caddr_t) &th); 998 spidx->src.sin.sin_port = th.th_sport; 999 spidx->dst.sin.sin_port = th.th_dport; 1000 return; 1001 case IPPROTO_UDP: 1002 spidx->ul_proto = nxt; 1003 if (!needport) 1004 goto done_proto; 1005 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1006 goto done; 1007 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 1008 spidx->src.sin.sin_port = uh.uh_sport; 1009 spidx->dst.sin.sin_port = uh.uh_dport; 1010 return; 1011 case IPPROTO_AH: 1012 if (m->m_pkthdr.len > off + sizeof(ip6e)) 1013 goto done; 1014 /* XXX sigh, this works but is totally bogus */ 1015 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 1016 off += (ip6e.ip6e_len + 2) << 2; 1017 nxt = ip6e.ip6e_nxt; 1018 break; 1019 case IPPROTO_ICMP: 1020 default: 1021 /* XXX intermediate headers??? */ 1022 spidx->ul_proto = nxt; 1023 goto done_proto; 1024 } 1025 } 1026 done: 1027 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1028 done_proto: 1029 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 1030 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 1031 } 1032 1033 /* assumes that m is sane */ 1034 static int 1035 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1036 { 1037 static const struct sockaddr_in template = { 1038 sizeof (struct sockaddr_in), 1039 AF_INET, 1040 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 1041 }; 1042 1043 spidx->src.sin = template; 1044 spidx->dst.sin = template; 1045 1046 if (m->m_len < sizeof (struct ip)) { 1047 m_copydata(m, offsetof(struct ip, ip_src), 1048 sizeof (struct in_addr), 1049 (caddr_t) &spidx->src.sin.sin_addr); 1050 m_copydata(m, offsetof(struct ip, ip_dst), 1051 sizeof (struct in_addr), 1052 (caddr_t) &spidx->dst.sin.sin_addr); 1053 } else { 1054 struct ip *ip = mtod(m, struct ip *); 1055 spidx->src.sin.sin_addr = ip->ip_src; 1056 spidx->dst.sin.sin_addr = ip->ip_dst; 1057 } 1058 1059 spidx->prefs = sizeof(struct in_addr) << 3; 1060 spidx->prefd = sizeof(struct in_addr) << 3; 1061 1062 return 0; 1063 } 1064 1065 #ifdef INET6 1066 static void 1067 ipsec6_get_ulp(m, spidx, needport) 1068 struct mbuf *m; 1069 struct secpolicyindex *spidx; 1070 int needport; 1071 { 1072 int off, nxt; 1073 struct tcphdr th; 1074 struct udphdr uh; 1075 1076 /* sanity check */ 1077 if (m == NULL) 1078 panic("ipsec6_get_ulp: NULL pointer was passed"); 1079 1080 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1081 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 1082 1083 /* set default */ 1084 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1085 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1086 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1087 1088 nxt = -1; 1089 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1090 if (off < 0 || m->m_pkthdr.len < off) 1091 return; 1092 1093 switch (nxt) { 1094 case IPPROTO_TCP: 1095 spidx->ul_proto = nxt; 1096 if (!needport) 1097 break; 1098 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1099 break; 1100 m_copydata(m, off, sizeof(th), (caddr_t)&th); 1101 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1102 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1103 break; 1104 case IPPROTO_UDP: 1105 spidx->ul_proto = nxt; 1106 if (!needport) 1107 break; 1108 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1109 break; 1110 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 1111 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1112 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1113 break; 1114 case IPPROTO_ICMPV6: 1115 default: 1116 /* XXX intermediate headers??? */ 1117 spidx->ul_proto = nxt; 1118 break; 1119 } 1120 } 1121 1122 /* assumes that m is sane */ 1123 static int 1124 ipsec6_setspidx_ipaddr(m, spidx) 1125 struct mbuf *m; 1126 struct secpolicyindex *spidx; 1127 { 1128 struct ip6_hdr *ip6 = NULL; 1129 struct ip6_hdr ip6buf; 1130 struct sockaddr_in6 *sin6; 1131 1132 if (m->m_len >= sizeof(*ip6)) 1133 ip6 = mtod(m, struct ip6_hdr *); 1134 else { 1135 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 1136 ip6 = &ip6buf; 1137 } 1138 1139 sin6 = (struct sockaddr_in6 *)&spidx->src; 1140 bzero(sin6, sizeof(*sin6)); 1141 sin6->sin6_family = AF_INET6; 1142 sin6->sin6_len = sizeof(struct sockaddr_in6); 1143 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 1144 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1145 sin6->sin6_addr.s6_addr16[1] = 0; 1146 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1147 } 1148 spidx->prefs = sizeof(struct in6_addr) << 3; 1149 1150 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1151 bzero(sin6, sizeof(*sin6)); 1152 sin6->sin6_family = AF_INET6; 1153 sin6->sin6_len = sizeof(struct sockaddr_in6); 1154 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 1155 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1156 sin6->sin6_addr.s6_addr16[1] = 0; 1157 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1158 } 1159 spidx->prefd = sizeof(struct in6_addr) << 3; 1160 1161 return 0; 1162 } 1163 #endif 1164 1165 static void 1166 ipsec_delpcbpolicy(p) 1167 struct inpcbpolicy *p; 1168 { 1169 free(p, M_SECA); 1170 } 1171 1172 /* initialize policy in PCB */ 1173 int 1174 ipsec_init_policy(so, pcb_sp) 1175 struct socket *so; 1176 struct inpcbpolicy **pcb_sp; 1177 { 1178 struct inpcbpolicy *new; 1179 1180 /* sanity check. */ 1181 if (so == NULL || pcb_sp == NULL) 1182 panic("ipsec_init_policy: NULL pointer was passed"); 1183 1184 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 1185 M_SECA, M_NOWAIT|M_ZERO); 1186 if (new == NULL) { 1187 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 1188 return ENOBUFS; 1189 } 1190 1191 if (IPSEC_PRIVILEGED_SO(so)) 1192 new->priv = 1; 1193 else 1194 new->priv = 0; 1195 1196 if ((new->sp_in = KEY_NEWSP()) == NULL) { 1197 ipsec_delpcbpolicy(new); 1198 return ENOBUFS; 1199 } 1200 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 1201 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 1202 1203 if ((new->sp_out = KEY_NEWSP()) == NULL) { 1204 KEY_FREESP(&new->sp_in); 1205 ipsec_delpcbpolicy(new); 1206 return ENOBUFS; 1207 } 1208 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 1209 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 1210 1211 *pcb_sp = new; 1212 1213 return 0; 1214 } 1215 1216 /* copy old ipsec policy into new */ 1217 int 1218 ipsec_copy_policy(old, new) 1219 struct inpcbpolicy *old, *new; 1220 { 1221 struct secpolicy *sp; 1222 1223 sp = ipsec_deepcopy_policy(old->sp_in); 1224 if (sp) { 1225 KEY_FREESP(&new->sp_in); 1226 new->sp_in = sp; 1227 } else 1228 return ENOBUFS; 1229 1230 sp = ipsec_deepcopy_policy(old->sp_out); 1231 if (sp) { 1232 KEY_FREESP(&new->sp_out); 1233 new->sp_out = sp; 1234 } else 1235 return ENOBUFS; 1236 1237 new->priv = old->priv; 1238 1239 return 0; 1240 } 1241 1242 /* deep-copy a policy in PCB */ 1243 static struct secpolicy * 1244 ipsec_deepcopy_policy(src) 1245 struct secpolicy *src; 1246 { 1247 struct ipsecrequest *newchain = NULL; 1248 struct ipsecrequest *p; 1249 struct ipsecrequest **q; 1250 struct ipsecrequest *r; 1251 struct secpolicy *dst; 1252 1253 if (src == NULL) 1254 return NULL; 1255 dst = KEY_NEWSP(); 1256 if (dst == NULL) 1257 return NULL; 1258 1259 /* 1260 * deep-copy IPsec request chain. This is required since struct 1261 * ipsecrequest is not reference counted. 1262 */ 1263 q = &newchain; 1264 for (p = src->req; p; p = p->next) { 1265 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest), 1266 M_SECA, M_NOWAIT); 1267 if (*q == NULL) 1268 goto fail; 1269 bzero(*q, sizeof(**q)); 1270 (*q)->next = NULL; 1271 1272 (*q)->saidx.proto = p->saidx.proto; 1273 (*q)->saidx.mode = p->saidx.mode; 1274 (*q)->level = p->level; 1275 (*q)->saidx.reqid = p->saidx.reqid; 1276 1277 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1278 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1279 1280 (*q)->sav = NULL; 1281 (*q)->sp = dst; 1282 1283 q = &((*q)->next); 1284 } 1285 1286 dst->req = newchain; 1287 dst->state = src->state; 1288 dst->policy = src->policy; 1289 /* do not touch the refcnt fields */ 1290 1291 return dst; 1292 1293 fail: 1294 for (p = newchain; p; p = r) { 1295 r = p->next; 1296 free(p, M_SECA); 1297 p = NULL; 1298 } 1299 return NULL; 1300 } 1301 1302 /* set policy and ipsec request if present. */ 1303 static int 1304 ipsec_set_policy( 1305 struct secpolicy **pcb_sp, 1306 int optname, 1307 caddr_t request, 1308 size_t len, 1309 int priv 1310 ) 1311 { 1312 struct sadb_x_policy *xpl; 1313 struct secpolicy *newsp = NULL; 1314 int error; 1315 1316 /* sanity check. */ 1317 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1318 return EINVAL; 1319 if (len < sizeof(*xpl)) 1320 return EINVAL; 1321 xpl = (struct sadb_x_policy *)request; 1322 1323 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1324 printf("ipsec_set_policy: passed policy\n"); 1325 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1326 1327 /* check policy type */ 1328 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1329 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1330 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1331 return EINVAL; 1332 1333 /* check privileged socket */ 1334 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1335 return EACCES; 1336 1337 /* allocation new SP entry */ 1338 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1339 return error; 1340 1341 newsp->state = IPSEC_SPSTATE_ALIVE; 1342 1343 /* clear old SP and set new SP */ 1344 KEY_FREESP(pcb_sp); 1345 *pcb_sp = newsp; 1346 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1347 printf("ipsec_set_policy: new policy\n"); 1348 kdebug_secpolicy(newsp)); 1349 1350 return 0; 1351 } 1352 1353 static int 1354 ipsec_get_policy(pcb_sp, mp) 1355 struct secpolicy *pcb_sp; 1356 struct mbuf **mp; 1357 { 1358 1359 /* sanity check. */ 1360 if (pcb_sp == NULL || mp == NULL) 1361 return EINVAL; 1362 1363 *mp = key_sp2msg(pcb_sp); 1364 if (!*mp) { 1365 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1366 return ENOBUFS; 1367 } 1368 1369 (*mp)->m_type = MT_DATA; 1370 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1371 printf("ipsec_get_policy:\n"); 1372 kdebug_mbuf(*mp)); 1373 1374 return 0; 1375 } 1376 1377 int 1378 ipsec4_set_policy(inp, optname, request, len, priv) 1379 struct inpcb *inp; 1380 int optname; 1381 caddr_t request; 1382 size_t len; 1383 int priv; 1384 { 1385 struct sadb_x_policy *xpl; 1386 struct secpolicy **pcb_sp; 1387 1388 /* sanity check. */ 1389 if (inp == NULL || request == NULL) 1390 return EINVAL; 1391 if (len < sizeof(*xpl)) 1392 return EINVAL; 1393 xpl = (struct sadb_x_policy *)request; 1394 1395 IPSEC_ASSERT(inp->inp_sp != NULL, 1396 ("ipsec4_set_policy(): null inp->in_sp")); 1397 1398 /* select direction */ 1399 switch (xpl->sadb_x_policy_dir) { 1400 case IPSEC_DIR_INBOUND: 1401 pcb_sp = &inp->inp_sp->sp_in; 1402 break; 1403 case IPSEC_DIR_OUTBOUND: 1404 pcb_sp = &inp->inp_sp->sp_out; 1405 break; 1406 default: 1407 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1408 xpl->sadb_x_policy_dir)); 1409 return EINVAL; 1410 } 1411 1412 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1413 } 1414 1415 int 1416 ipsec4_get_policy(inp, request, len, mp) 1417 struct inpcb *inp; 1418 caddr_t request; 1419 size_t len; 1420 struct mbuf **mp; 1421 { 1422 struct sadb_x_policy *xpl; 1423 struct secpolicy *pcb_sp; 1424 1425 /* sanity check. */ 1426 if (inp == NULL || request == NULL || mp == NULL) 1427 return EINVAL; 1428 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1429 if (len < sizeof(*xpl)) 1430 return EINVAL; 1431 xpl = (struct sadb_x_policy *)request; 1432 1433 /* select direction */ 1434 switch (xpl->sadb_x_policy_dir) { 1435 case IPSEC_DIR_INBOUND: 1436 pcb_sp = inp->inp_sp->sp_in; 1437 break; 1438 case IPSEC_DIR_OUTBOUND: 1439 pcb_sp = inp->inp_sp->sp_out; 1440 break; 1441 default: 1442 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1443 xpl->sadb_x_policy_dir)); 1444 return EINVAL; 1445 } 1446 1447 return ipsec_get_policy(pcb_sp, mp); 1448 } 1449 1450 /* delete policy in PCB */ 1451 int 1452 ipsec4_delete_pcbpolicy(inp) 1453 struct inpcb *inp; 1454 { 1455 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1456 1457 if (inp->inp_sp == NULL) 1458 return 0; 1459 1460 if (inp->inp_sp->sp_in != NULL) 1461 KEY_FREESP(&inp->inp_sp->sp_in); 1462 1463 if (inp->inp_sp->sp_out != NULL) 1464 KEY_FREESP(&inp->inp_sp->sp_out); 1465 1466 ipsec_delpcbpolicy(inp->inp_sp); 1467 inp->inp_sp = NULL; 1468 1469 return 0; 1470 } 1471 1472 #ifdef INET6 1473 int 1474 ipsec6_set_policy(in6p, optname, request, len, priv) 1475 struct in6pcb *in6p; 1476 int optname; 1477 caddr_t request; 1478 size_t len; 1479 int priv; 1480 { 1481 struct sadb_x_policy *xpl; 1482 struct secpolicy **pcb_sp; 1483 1484 /* sanity check. */ 1485 if (in6p == NULL || request == NULL) 1486 return EINVAL; 1487 if (len < sizeof(*xpl)) 1488 return EINVAL; 1489 xpl = (struct sadb_x_policy *)request; 1490 1491 /* select direction */ 1492 switch (xpl->sadb_x_policy_dir) { 1493 case IPSEC_DIR_INBOUND: 1494 pcb_sp = &in6p->in6p_sp->sp_in; 1495 break; 1496 case IPSEC_DIR_OUTBOUND: 1497 pcb_sp = &in6p->in6p_sp->sp_out; 1498 break; 1499 default: 1500 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1501 xpl->sadb_x_policy_dir)); 1502 return EINVAL; 1503 } 1504 1505 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1506 } 1507 1508 int 1509 ipsec6_get_policy(in6p, request, len, mp) 1510 struct in6pcb *in6p; 1511 caddr_t request; 1512 size_t len; 1513 struct mbuf **mp; 1514 { 1515 struct sadb_x_policy *xpl; 1516 struct secpolicy *pcb_sp; 1517 1518 /* sanity check. */ 1519 if (in6p == NULL || request == NULL || mp == NULL) 1520 return EINVAL; 1521 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1522 if (len < sizeof(*xpl)) 1523 return EINVAL; 1524 xpl = (struct sadb_x_policy *)request; 1525 1526 /* select direction */ 1527 switch (xpl->sadb_x_policy_dir) { 1528 case IPSEC_DIR_INBOUND: 1529 pcb_sp = in6p->in6p_sp->sp_in; 1530 break; 1531 case IPSEC_DIR_OUTBOUND: 1532 pcb_sp = in6p->in6p_sp->sp_out; 1533 break; 1534 default: 1535 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1536 xpl->sadb_x_policy_dir)); 1537 return EINVAL; 1538 } 1539 1540 return ipsec_get_policy(pcb_sp, mp); 1541 } 1542 1543 int 1544 ipsec6_delete_pcbpolicy(in6p) 1545 struct in6pcb *in6p; 1546 { 1547 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1548 1549 if (in6p->in6p_sp == NULL) 1550 return 0; 1551 1552 if (in6p->in6p_sp->sp_in != NULL) 1553 KEY_FREESP(&in6p->in6p_sp->sp_in); 1554 1555 if (in6p->in6p_sp->sp_out != NULL) 1556 KEY_FREESP(&in6p->in6p_sp->sp_out); 1557 1558 ipsec_delpcbpolicy(in6p->in6p_sp); 1559 in6p->in6p_sp = NULL; 1560 1561 return 0; 1562 } 1563 #endif 1564 1565 /* 1566 * return current level. 1567 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1568 */ 1569 u_int 1570 ipsec_get_reqlevel(isr) 1571 struct ipsecrequest *isr; 1572 { 1573 u_int level = 0; 1574 u_int esp_trans_deflev, esp_net_deflev; 1575 u_int ah_trans_deflev, ah_net_deflev; 1576 1577 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1578 ("ipsec_get_reqlevel: null argument")); 1579 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1580 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1581 isr->sp->spidx.src.sa.sa_family, 1582 isr->sp->spidx.dst.sa.sa_family)); 1583 1584 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1585 #define IPSEC_CHECK_DEFAULT(lev) \ 1586 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1587 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1588 ? (ipsec_debug \ 1589 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1590 (lev), IPSEC_LEVEL_REQUIRE) \ 1591 : 0), \ 1592 (lev) = IPSEC_LEVEL_REQUIRE, \ 1593 (lev) \ 1594 : (lev)) 1595 1596 /* set default level */ 1597 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1598 #ifdef INET 1599 case AF_INET: 1600 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1601 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1602 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1603 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1604 break; 1605 #endif 1606 #ifdef INET6 1607 case AF_INET6: 1608 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1609 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1610 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1611 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1612 break; 1613 #endif /* INET6 */ 1614 default: 1615 panic("key_get_reqlevel: unknown af %u", 1616 isr->sp->spidx.src.sa.sa_family); 1617 } 1618 1619 #undef IPSEC_CHECK_DEFAULT 1620 1621 /* set level */ 1622 switch (isr->level) { 1623 case IPSEC_LEVEL_DEFAULT: 1624 switch (isr->saidx.proto) { 1625 case IPPROTO_ESP: 1626 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1627 level = esp_net_deflev; 1628 else 1629 level = esp_trans_deflev; 1630 break; 1631 case IPPROTO_AH: 1632 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1633 level = ah_net_deflev; 1634 else 1635 level = ah_trans_deflev; 1636 break; 1637 case IPPROTO_IPCOMP: 1638 /* 1639 * we don't really care, as IPcomp document says that 1640 * we shouldn't compress small packets 1641 */ 1642 level = IPSEC_LEVEL_USE; 1643 break; 1644 default: 1645 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1646 isr->saidx.proto); 1647 } 1648 break; 1649 1650 case IPSEC_LEVEL_USE: 1651 case IPSEC_LEVEL_REQUIRE: 1652 level = isr->level; 1653 break; 1654 case IPSEC_LEVEL_UNIQUE: 1655 level = IPSEC_LEVEL_REQUIRE; 1656 break; 1657 1658 default: 1659 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1660 isr->level); 1661 } 1662 1663 return level; 1664 } 1665 1666 /* 1667 * Check security policy requirements against the actual 1668 * packet contents. Return one if the packet should be 1669 * reject as "invalid"; otherwiser return zero to have the 1670 * packet treated as "valid". 1671 * 1672 * OUT: 1673 * 0: valid 1674 * 1: invalid 1675 */ 1676 int 1677 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1678 { 1679 struct ipsecrequest *isr; 1680 int need_auth; 1681 1682 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1683 printf("ipsec_in_reject: using SP\n"); 1684 kdebug_secpolicy(sp)); 1685 1686 /* check policy */ 1687 switch (sp->policy) { 1688 case IPSEC_POLICY_DISCARD: 1689 return 1; 1690 case IPSEC_POLICY_BYPASS: 1691 case IPSEC_POLICY_NONE: 1692 return 0; 1693 } 1694 1695 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1696 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1697 1698 /* XXX should compare policy against ipsec header history */ 1699 1700 need_auth = 0; 1701 for (isr = sp->req; isr != NULL; isr = isr->next) { 1702 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1703 continue; 1704 switch (isr->saidx.proto) { 1705 case IPPROTO_ESP: 1706 if ((m->m_flags & M_DECRYPTED) == 0) { 1707 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1708 printf("ipsec_in_reject: ESP m_flags:%x\n", 1709 m->m_flags)); 1710 return 1; 1711 } 1712 1713 if (!need_auth && 1714 isr->sav != NULL && 1715 isr->sav->tdb_authalgxform != NULL && 1716 (m->m_flags & M_AUTHIPDGM) == 0) { 1717 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1718 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1719 m->m_flags)); 1720 return 1; 1721 } 1722 break; 1723 case IPPROTO_AH: 1724 need_auth = 1; 1725 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1726 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1727 printf("ipsec_in_reject: AH m_flags:%x\n", 1728 m->m_flags)); 1729 return 1; 1730 } 1731 break; 1732 case IPPROTO_IPCOMP: 1733 /* 1734 * we don't really care, as IPcomp document 1735 * says that we shouldn't compress small 1736 * packets, IPComp policy should always be 1737 * treated as being in "use" level. 1738 */ 1739 break; 1740 } 1741 } 1742 return 0; /* valid */ 1743 } 1744 1745 /* 1746 * Check AH/ESP integrity. 1747 * This function is called from tcp_input(), udp_input(), 1748 * and {ah,esp}4_input for tunnel mode 1749 */ 1750 int 1751 ipsec4_in_reject(m, inp) 1752 struct mbuf *m; 1753 struct inpcb *inp; 1754 { 1755 struct secpolicy *sp; 1756 int error; 1757 int result; 1758 1759 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1760 1761 /* get SP for this packet. 1762 * When we are called from ip_forward(), we call 1763 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1764 */ 1765 if (inp == NULL) 1766 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1767 else 1768 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1769 IN4PCB_TO_PCB(inp), &error); 1770 1771 if (sp != NULL) { 1772 result = ipsec_in_reject(sp, m); 1773 if (result) 1774 newipsecstat.ips_in_polvio++; 1775 KEY_FREESP(&sp); 1776 } else { 1777 result = 0; /* XXX should be panic ? 1778 * -> No, there may be error. */ 1779 } 1780 return result; 1781 } 1782 1783 1784 #ifdef INET6 1785 /* 1786 * Check AH/ESP integrity. 1787 * This function is called from tcp6_input(), udp6_input(), 1788 * and {ah,esp}6_input for tunnel mode 1789 */ 1790 int 1791 ipsec6_in_reject(m, in6p) 1792 struct mbuf *m; 1793 struct in6pcb *in6p; 1794 { 1795 struct secpolicy *sp = NULL; 1796 int error; 1797 int result; 1798 1799 /* sanity check */ 1800 if (m == NULL) 1801 return 0; /* XXX should be panic ? */ 1802 1803 /* get SP for this packet. 1804 * When we are called from ip_forward(), we call 1805 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1806 */ 1807 if (in6p == NULL) 1808 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1809 else 1810 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1811 IN6PCB_TO_PCB(in6p), 1812 &error); 1813 1814 if (sp != NULL) { 1815 result = ipsec_in_reject(sp, m); 1816 if (result) 1817 newipsecstat.ips_in_polvio++; 1818 KEY_FREESP(&sp); 1819 } else { 1820 result = 0; 1821 } 1822 return result; 1823 } 1824 #endif 1825 1826 /* 1827 * compute the byte size to be occupied by IPsec header. 1828 * in case it is tunneled, it includes the size of outer IP header. 1829 * NOTE: SP passed is free in this function. 1830 */ 1831 static size_t 1832 ipsec_hdrsiz(struct secpolicy *sp) 1833 { 1834 struct ipsecrequest *isr; 1835 size_t siz; 1836 1837 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1838 printf("ipsec_hdrsiz: using SP\n"); 1839 kdebug_secpolicy(sp)); 1840 1841 switch (sp->policy) { 1842 case IPSEC_POLICY_DISCARD: 1843 case IPSEC_POLICY_BYPASS: 1844 case IPSEC_POLICY_NONE: 1845 return 0; 1846 } 1847 1848 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1849 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1850 1851 siz = 0; 1852 for (isr = sp->req; isr != NULL; isr = isr->next) { 1853 size_t clen = 0; 1854 1855 switch (isr->saidx.proto) { 1856 case IPPROTO_ESP: 1857 clen = esp_hdrsiz(isr->sav); 1858 break; 1859 case IPPROTO_AH: 1860 clen = ah_hdrsiz(isr->sav); 1861 break; 1862 case IPPROTO_IPCOMP: 1863 clen = sizeof(struct ipcomp); 1864 break; 1865 } 1866 1867 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1868 switch (isr->saidx.dst.sa.sa_family) { 1869 case AF_INET: 1870 clen += sizeof(struct ip); 1871 break; 1872 #ifdef INET6 1873 case AF_INET6: 1874 clen += sizeof(struct ip6_hdr); 1875 break; 1876 #endif 1877 default: 1878 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1879 "unknown AF %d in IPsec tunnel SA\n", 1880 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1881 break; 1882 } 1883 } 1884 siz += clen; 1885 } 1886 1887 return siz; 1888 } 1889 1890 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1891 size_t 1892 ipsec4_hdrsiz(m, dir, inp) 1893 struct mbuf *m; 1894 u_int dir; 1895 struct inpcb *inp; 1896 { 1897 struct secpolicy *sp; 1898 int error; 1899 size_t size; 1900 1901 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1902 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1903 ("ipsec4_hdrsize: socket w/o inpcb")); 1904 1905 /* get SP for this packet. 1906 * When we are called from ip_forward(), we call 1907 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1908 */ 1909 if (inp == NULL) 1910 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1911 else 1912 sp = ipsec_getpolicybysock(m, dir, 1913 IN4PCB_TO_PCB(inp), &error); 1914 1915 if (sp != NULL) { 1916 size = ipsec_hdrsiz(sp); 1917 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1918 printf("ipsec4_hdrsiz: size:%lu.\n", 1919 (unsigned long)size)); 1920 1921 KEY_FREESP(&sp); 1922 } else { 1923 size = 0; /* XXX should be panic ? */ 1924 } 1925 return size; 1926 } 1927 1928 #ifdef INET6 1929 /* This function is called from ipsec6_hdrsize_tcp(), 1930 * and maybe from ip6_forward.() 1931 */ 1932 size_t 1933 ipsec6_hdrsiz(m, dir, in6p) 1934 struct mbuf *m; 1935 u_int dir; 1936 struct in6pcb *in6p; 1937 { 1938 struct secpolicy *sp; 1939 int error; 1940 size_t size; 1941 1942 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1943 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1944 ("ipsec6_hdrsize: socket w/o inpcb")); 1945 1946 /* get SP for this packet */ 1947 /* XXX Is it right to call with IP_FORWARDING. */ 1948 if (in6p == NULL) 1949 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1950 else 1951 sp = ipsec_getpolicybysock(m, dir, 1952 IN6PCB_TO_PCB(in6p), 1953 &error); 1954 1955 if (sp == NULL) 1956 return 0; 1957 size = ipsec_hdrsiz(sp); 1958 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1959 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1960 KEY_FREESP(&sp); 1961 1962 return size; 1963 } 1964 #endif /*INET6*/ 1965 1966 /* 1967 * Check the variable replay window. 1968 * ipsec_chkreplay() performs replay check before ICV verification. 1969 * ipsec_updatereplay() updates replay bitmap. This must be called after 1970 * ICV verification (it also performs replay check, which is usually done 1971 * beforehand). 1972 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1973 * 1974 * based on RFC 2401. 1975 */ 1976 int 1977 ipsec_chkreplay(seq, sav) 1978 u_int32_t seq; 1979 struct secasvar *sav; 1980 { 1981 const struct secreplay *replay; 1982 u_int32_t diff; 1983 int fr; 1984 u_int32_t wsizeb; /* constant: bits of window size */ 1985 int frlast; /* constant: last frame */ 1986 1987 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 1988 1989 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1990 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1991 1992 replay = sav->replay; 1993 1994 if (replay->wsize == 0) 1995 return 1; /* no need to check replay. */ 1996 1997 /* constant */ 1998 frlast = replay->wsize - 1; 1999 wsizeb = replay->wsize << 3; 2000 2001 /* sequence number of 0 is invalid */ 2002 if (seq == 0) 2003 return 0; 2004 2005 /* first time is always okay */ 2006 if (replay->count == 0) 2007 return 1; 2008 2009 if (seq > replay->lastseq) { 2010 /* larger sequences are okay */ 2011 return 1; 2012 } else { 2013 /* seq is equal or less than lastseq. */ 2014 diff = replay->lastseq - seq; 2015 2016 /* over range to check, i.e. too old or wrapped */ 2017 if (diff >= wsizeb) 2018 return 0; 2019 2020 fr = frlast - diff / 8; 2021 2022 /* this packet already seen ? */ 2023 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2024 return 0; 2025 2026 /* out of order but good */ 2027 return 1; 2028 } 2029 } 2030 2031 /* 2032 * check replay counter whether to update or not. 2033 * OUT: 0: OK 2034 * 1: NG 2035 */ 2036 int 2037 ipsec_updatereplay(seq, sav) 2038 u_int32_t seq; 2039 struct secasvar *sav; 2040 { 2041 struct secreplay *replay; 2042 u_int32_t diff; 2043 int fr; 2044 u_int32_t wsizeb; /* constant: bits of window size */ 2045 int frlast; /* constant: last frame */ 2046 2047 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 2048 2049 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 2050 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 2051 2052 replay = sav->replay; 2053 2054 if (replay->wsize == 0) 2055 goto ok; /* no need to check replay. */ 2056 2057 /* constant */ 2058 frlast = replay->wsize - 1; 2059 wsizeb = replay->wsize << 3; 2060 2061 /* sequence number of 0 is invalid */ 2062 if (seq == 0) 2063 return 1; 2064 2065 /* first time */ 2066 if (replay->count == 0) { 2067 replay->lastseq = seq; 2068 bzero(replay->bitmap, replay->wsize); 2069 (replay->bitmap)[frlast] = 1; 2070 goto ok; 2071 } 2072 2073 if (seq > replay->lastseq) { 2074 /* seq is larger than lastseq. */ 2075 diff = seq - replay->lastseq; 2076 2077 /* new larger sequence number */ 2078 if (diff < wsizeb) { 2079 /* In window */ 2080 /* set bit for this packet */ 2081 vshiftl(replay->bitmap, diff, replay->wsize); 2082 (replay->bitmap)[frlast] |= 1; 2083 } else { 2084 /* this packet has a "way larger" */ 2085 bzero(replay->bitmap, replay->wsize); 2086 (replay->bitmap)[frlast] = 1; 2087 } 2088 replay->lastseq = seq; 2089 2090 /* larger is good */ 2091 } else { 2092 /* seq is equal or less than lastseq. */ 2093 diff = replay->lastseq - seq; 2094 2095 /* over range to check, i.e. too old or wrapped */ 2096 if (diff >= wsizeb) 2097 return 1; 2098 2099 fr = frlast - diff / 8; 2100 2101 /* this packet already seen ? */ 2102 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2103 return 1; 2104 2105 /* mark as seen */ 2106 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2107 2108 /* out of order but good */ 2109 } 2110 2111 ok: 2112 if (replay->count == ~0) { 2113 2114 /* set overflow flag */ 2115 replay->overflow++; 2116 2117 /* don't increment, no more packets accepted */ 2118 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2119 return 1; 2120 2121 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2122 replay->overflow, ipsec_logsastr(sav))); 2123 } 2124 2125 replay->count++; 2126 2127 return 0; 2128 } 2129 2130 /* 2131 * shift variable length bunffer to left. 2132 * IN: bitmap: pointer to the buffer 2133 * nbit: the number of to shift. 2134 * wsize: buffer size (bytes). 2135 */ 2136 static void 2137 vshiftl(bitmap, nbit, wsize) 2138 unsigned char *bitmap; 2139 int nbit, wsize; 2140 { 2141 int s, j, i; 2142 unsigned char over; 2143 2144 for (j = 0; j < nbit; j += 8) { 2145 s = (nbit - j < 8) ? (nbit - j): 8; 2146 bitmap[0] <<= s; 2147 for (i = 1; i < wsize; i++) { 2148 over = (bitmap[i] >> (8 - s)); 2149 bitmap[i] <<= s; 2150 bitmap[i-1] |= over; 2151 } 2152 } 2153 2154 return; 2155 } 2156 2157 /* Return a printable string for the IPv4 address. */ 2158 static char * 2159 inet_ntoa4(struct in_addr ina) 2160 { 2161 static char buf[4][4 * sizeof "123" + 4]; 2162 unsigned char *ucp = (unsigned char *) &ina; 2163 static int i = 3; 2164 2165 i = (i + 1) % 4; 2166 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2167 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2168 return (buf[i]); 2169 } 2170 2171 /* Return a printable string for the address. */ 2172 const char * 2173 ipsec_address(union sockaddr_union* sa) 2174 { 2175 switch (sa->sa.sa_family) { 2176 #if INET 2177 case AF_INET: 2178 return inet_ntoa4(sa->sin.sin_addr); 2179 #endif /* INET */ 2180 2181 #if INET6 2182 case AF_INET6: 2183 return ip6_sprintf(&sa->sin6.sin6_addr); 2184 #endif /* INET6 */ 2185 2186 default: 2187 return "(unknown address family)"; 2188 } 2189 } 2190 2191 const char * 2192 ipsec_logsastr(sav) 2193 struct secasvar *sav; 2194 { 2195 static char buf[256]; 2196 char *p; 2197 struct secasindex *saidx = &sav->sah->saidx; 2198 2199 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2200 ("ipsec_logsastr: address family mismatch")); 2201 2202 p = buf; 2203 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2204 while (p && *p) 2205 p++; 2206 /* NB: only use ipsec_address on one address at a time */ 2207 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2208 ipsec_address(&saidx->src)); 2209 while (p && *p) 2210 p++; 2211 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2212 ipsec_address(&saidx->dst)); 2213 2214 return buf; 2215 } 2216 2217 void 2218 ipsec_dumpmbuf(m) 2219 struct mbuf *m; 2220 { 2221 int totlen; 2222 int i; 2223 u_char *p; 2224 2225 totlen = 0; 2226 printf("---\n"); 2227 while (m) { 2228 p = mtod(m, u_char *); 2229 for (i = 0; i < m->m_len; i++) { 2230 printf("%02x ", p[i]); 2231 totlen++; 2232 if (totlen % 16 == 0) 2233 printf("\n"); 2234 } 2235 m = m->m_next; 2236 } 2237 if (totlen % 16 != 0) 2238 printf("\n"); 2239 printf("---\n"); 2240 } 2241 2242 #ifdef INET6 2243 struct secpolicy * 2244 ipsec6_check_policy(m,so,flags,needipsecp,errorp) 2245 struct mbuf * m; 2246 const struct socket * so; 2247 int flags; 2248 int * needipsecp; 2249 int * errorp; 2250 { 2251 struct in6pcb *in6p = NULL; 2252 struct m_tag *mtag; 2253 struct secpolicy *sp = NULL; 2254 struct tdb_ident *tdbi; 2255 int s; 2256 int error = 0; 2257 int needipsec = 0; 2258 2259 if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6) 2260 in6p = sotoin6pcb(so); 2261 2262 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 2263 s = splsoftnet(); 2264 if (mtag != NULL) { 2265 tdbi = (struct tdb_ident *)(mtag + 1); 2266 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND); 2267 if (sp == NULL) 2268 error = -EINVAL; /* force silent drop */ 2269 m_tag_delete(m, mtag); 2270 } else { 2271 if (in6p != NULL && 2272 IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) 2273 goto skippolicycheck; 2274 sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p); 2275 } 2276 2277 /* 2278 * There are four return cases: 2279 * sp != NULL apply IPsec policy 2280 * sp == NULL, error == 0 no IPsec handling needed 2281 * sp == NULL, error == -EINVAL discard packet w/o error 2282 * sp == NULL, error != 0 discard packet, report error 2283 */ 2284 2285 if (sp == NULL) { 2286 splx(s); 2287 2288 if (error != 0) { 2289 needipsec = 0; 2290 } else { 2291 /* No IPsec processing for this packet. */ 2292 needipsec = 0; 2293 } 2294 } else { 2295 /* Loop detection, check if ipsec processing already done */ 2296 IPSEC_ASSERT(sp->req != NULL, ("ip6_output: no ipsec request")); 2297 for (mtag = m_tag_first(m); mtag != NULL; 2298 mtag = m_tag_next(m, mtag)) { 2299 #ifdef MTAG_ABI_COMPAT 2300 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT) 2301 continue; 2302 #endif 2303 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE && 2304 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED) 2305 continue; 2306 /* 2307 * Check if policy has an SA associated with it. 2308 * This can happen when an SP has yet to acquire 2309 * an SA; e.g. on first reference. If it occurs, 2310 * then we let ipsec4_process_packet do its thing. 2311 */ 2312 if (sp->req->sav == NULL) 2313 break; 2314 tdbi = (struct tdb_ident *)(mtag + 1); 2315 if (tdbi->spi == sp->req->sav->spi && 2316 tdbi->proto == sp->req->sav->sah->saidx.proto && 2317 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst, 2318 sizeof (union sockaddr_union)) == 0) { 2319 /* 2320 * No IPsec processing is needed, free 2321 * reference to SP. 2322 * 2323 * NB: null pointer to avoid free at 2324 * done: below. 2325 */ 2326 KEY_FREESP(&sp), sp = NULL; 2327 needipsec = 0; 2328 splx(s); 2329 goto skippolicycheck; 2330 } 2331 } 2332 splx(s); 2333 needipsec = 1; 2334 } 2335 skippolicycheck:; 2336 2337 *errorp = error; 2338 *needipsecp = needipsec; 2339 return sp; 2340 } 2341 #endif 2342 2343 2344 2345 /* XXX this stuff doesn't belong here... */ 2346 2347 static struct xformsw* xforms = NULL; 2348 2349 /* 2350 * Register a transform; typically at system startup. 2351 */ 2352 void 2353 xform_register(struct xformsw* xsp) 2354 { 2355 xsp->xf_next = xforms; 2356 xforms = xsp; 2357 } 2358 2359 /* 2360 * Initialize transform support in an sav. 2361 */ 2362 int 2363 xform_init(struct secasvar *sav, int xftype) 2364 { 2365 struct xformsw *xsp; 2366 2367 if (sav->tdb_xform != NULL) /* previously initialized */ 2368 return 0; 2369 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2370 if (xsp->xf_type == xftype) 2371 return (*xsp->xf_init)(sav, xsp); 2372 2373 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2374 return EINVAL; 2375 } 2376 2377 #ifdef __NetBSD__ 2378 void 2379 ipsec_attach(void) 2380 { 2381 printf("initializing IPsec..."); 2382 ah_attach(); 2383 esp_attach(); 2384 ipcomp_attach(); 2385 ipe4_attach(); 2386 #ifdef TCP_SIGNATURE 2387 tcpsignature_attach(); 2388 #endif 2389 printf(" done\n"); 2390 } 2391 #endif /* __NetBSD__ */
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