ipsec.c revision 1.25.2.1
1 /* $NetBSD: ipsec.c,v 1.25.2.1 2007/05/12 19:24:49 pavel 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 1.25.2.1 2007/05/12 19:24:49 pavel 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(const char* where, int tag) 431 { 432 struct secpolicy *sp; 433 434 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 435 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 436 437 sp = &ip4_def_policy; 438 if (sp->policy != IPSEC_POLICY_DISCARD && 439 sp->policy != IPSEC_POLICY_NONE) { 440 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 441 sp->policy, IPSEC_POLICY_NONE)); 442 sp->policy = IPSEC_POLICY_NONE; 443 } 444 sp->refcnt++; 445 446 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 447 printf("DP key_allocsp_default returns SP:%p (%u)\n", 448 sp, sp->refcnt)); 449 return sp; 450 } 451 #define KEY_ALLOCSP_DEFAULT() \ 452 key_allocsp_default(__FILE__, __LINE__) 453 454 /* 455 * For OUTBOUND packet having a socket. Searching SPD for packet, 456 * and return a pointer to SP. 457 * OUT: NULL: no apropreate SP found, the following value is set to error. 458 * 0 : bypass 459 * EACCES : discard packet. 460 * ENOENT : ipsec_acquire() in progress, maybe. 461 * others : error occurred. 462 * others: a pointer to SP 463 * 464 * NOTE: IPv6 mapped address concern is implemented here. 465 */ 466 struct secpolicy * 467 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 468 { 469 struct secpolicy *sp; 470 471 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 472 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 473 ("ipsec_getpolicy: invalid direction %u", dir)); 474 475 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 476 if (sp == NULL) /*XXX????*/ 477 sp = KEY_ALLOCSP_DEFAULT(); 478 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 479 return sp; 480 } 481 482 /* 483 * For OUTBOUND packet having a socket. Searching SPD for packet, 484 * and return a pointer to SP. 485 * OUT: NULL: no apropreate SP found, the following value is set to error. 486 * 0 : bypass 487 * EACCES : discard packet. 488 * ENOENT : ipsec_acquire() in progress, maybe. 489 * others : error occurred. 490 * others: a pointer to SP 491 * 492 * NOTE: IPv6 mapped address concern is implemented here. 493 */ 494 static struct secpolicy * 495 ipsec_getpolicybysock(m, dir, inp, error) 496 struct mbuf *m; 497 u_int dir; 498 PCB_T *inp; 499 int *error; 500 { 501 struct inpcbpolicy *pcbsp = NULL; 502 struct secpolicy *currsp = NULL; /* policy on socket */ 503 struct secpolicy *sp; 504 int af; 505 506 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 507 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 508 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 509 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 510 ("ipsec_getpolicybysock: invalid direction %u", dir)); 511 512 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, 513 ("ipsec_getppolicybysock: null socket\n")); 514 515 /* XXX FIXME inpcb/in6pcb vs socket*/ 516 af = PCB_FAMILY(inp); 517 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 518 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 519 520 #ifdef __NetBSD__ 521 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache")); 522 /* If we have a cached entry, and if it is still valid, use it. */ 523 ipsecstat.ips_spdcache_lookup++; 524 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); 525 if (currsp) { 526 *error = 0; 527 return currsp; 528 } 529 ipsecstat.ips_spdcache_miss++; 530 #endif /* __NetBSD__ */ 531 532 switch (af) { 533 case AF_INET: { 534 struct inpcb *in4p = PCB_TO_IN4PCB(inp); 535 /* set spidx in pcb */ 536 *error = ipsec4_setspidx_inpcb(m, in4p); 537 pcbsp = in4p->inp_sp; 538 break; 539 } 540 541 #if defined(INET6) 542 case AF_INET6: { 543 struct in6pcb *in6p = PCB_TO_IN6PCB(inp); 544 /* set spidx in pcb */ 545 *error = ipsec6_setspidx_in6pcb(m, in6p); 546 pcbsp = in6p->in6p_sp; 547 break; 548 } 549 #endif 550 default: 551 *error = EPFNOSUPPORT; 552 break; 553 } 554 if (*error) 555 return NULL; 556 557 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 558 switch (dir) { 559 case IPSEC_DIR_INBOUND: 560 currsp = pcbsp->sp_in; 561 break; 562 case IPSEC_DIR_OUTBOUND: 563 currsp = pcbsp->sp_out; 564 break; 565 } 566 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 567 568 if (pcbsp->priv) { /* when privilieged socket */ 569 switch (currsp->policy) { 570 case IPSEC_POLICY_BYPASS: 571 case IPSEC_POLICY_IPSEC: 572 currsp->refcnt++; 573 sp = currsp; 574 break; 575 576 case IPSEC_POLICY_ENTRUST: 577 /* look for a policy in SPD */ 578 sp = KEY_ALLOCSP(&currsp->spidx, dir); 579 if (sp == NULL) /* no SP found */ 580 sp = KEY_ALLOCSP_DEFAULT(); 581 break; 582 583 default: 584 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 585 "Invalid policy for PCB %d\n", currsp->policy)); 586 *error = EINVAL; 587 return NULL; 588 } 589 } else { /* unpriv, SPD has policy */ 590 sp = KEY_ALLOCSP(&currsp->spidx, dir); 591 if (sp == NULL) { /* no SP found */ 592 switch (currsp->policy) { 593 case IPSEC_POLICY_BYPASS: 594 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 595 "Illegal policy for non-priviliged defined %d\n", 596 currsp->policy)); 597 *error = EINVAL; 598 return NULL; 599 600 case IPSEC_POLICY_ENTRUST: 601 sp = KEY_ALLOCSP_DEFAULT(); 602 break; 603 604 case IPSEC_POLICY_IPSEC: 605 currsp->refcnt++; 606 sp = currsp; 607 break; 608 609 default: 610 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 611 "Invalid policy for PCB %d\n", currsp->policy)); 612 *error = EINVAL; 613 return NULL; 614 } 615 } 616 } 617 IPSEC_ASSERT(sp != NULL, 618 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 619 pcbsp->priv, currsp->policy)); 620 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 621 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 622 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 623 sp, sp->refcnt)); 624 #ifdef __NetBSD__ 625 ipsec_fillpcbcache(pcbsp, m, sp, dir); 626 #endif /* __NetBSD__ */ 627 return sp; 628 } 629 630 /* 631 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 632 * and return a pointer to SP. 633 * OUT: positive: a pointer to the entry for security policy leaf matched. 634 * NULL: no apropreate SP found, the following value is set to error. 635 * 0 : bypass 636 * EACCES : discard packet. 637 * ENOENT : ipsec_acquire() in progress, maybe. 638 * others : error occurred. 639 */ 640 struct secpolicy * 641 ipsec_getpolicybyaddr(m, dir, flag, error) 642 struct mbuf *m; 643 u_int dir; 644 int flag; 645 int *error; 646 { 647 struct secpolicyindex spidx; 648 struct secpolicy *sp; 649 650 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 651 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 652 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 653 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 654 655 sp = NULL; 656 if (key_havesp(dir)) { 657 /* Make an index to look for a policy. */ 658 *error = ipsec_setspidx(m, &spidx, 659 (flag & IP_FORWARDING) ? 0 : 1); 660 if (*error != 0) { 661 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 662 " dir %u flag %u\n", dir, flag)); 663 bzero(&spidx, sizeof (spidx)); 664 return NULL; 665 } 666 spidx.dir = dir; 667 668 sp = KEY_ALLOCSP(&spidx, dir); 669 } 670 if (sp == NULL) /* no SP found, use system default */ 671 sp = KEY_ALLOCSP_DEFAULT(); 672 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 673 return sp; 674 } 675 676 struct secpolicy * 677 ipsec4_checkpolicy(m, dir, flag, error, inp) 678 struct mbuf *m; 679 u_int dir, flag; 680 int *error; 681 struct inpcb *inp; 682 { 683 struct secpolicy *sp; 684 685 *error = 0; 686 687 688 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 689 if (inp == NULL || inp->inp_socket == NULL) { 690 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 691 } else 692 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); 693 if (sp == NULL) { 694 IPSEC_ASSERT(*error != 0, 695 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 696 newipsecstat.ips_out_inval++; 697 return NULL; 698 } 699 IPSEC_ASSERT(*error == 0, 700 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 701 switch (sp->policy) { 702 case IPSEC_POLICY_ENTRUST: 703 default: 704 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 705 /* fall thru... */ 706 case IPSEC_POLICY_DISCARD: 707 newipsecstat.ips_out_polvio++; 708 *error = -EINVAL; /* packet is discarded by caller */ 709 break; 710 case IPSEC_POLICY_BYPASS: 711 case IPSEC_POLICY_NONE: 712 KEY_FREESP(&sp); 713 sp = NULL; /* NB: force NULL result */ 714 break; 715 case IPSEC_POLICY_IPSEC: 716 if (sp->req == NULL) /* acquire an SA */ 717 *error = key_spdacquire(sp); 718 break; 719 } 720 if (*error != 0) { 721 KEY_FREESP(&sp); 722 sp = NULL; 723 } 724 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 725 return sp; 726 } 727 728 static int 729 ipsec4_setspidx_inpcb(m, pcb) 730 struct mbuf *m; 731 struct inpcb *pcb; 732 { 733 int error; 734 735 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 736 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 737 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 738 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 739 740 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 741 if (error == 0) { 742 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 743 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 744 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 745 } else { 746 bzero(&pcb->inp_sp->sp_in->spidx, 747 sizeof (pcb->inp_sp->sp_in->spidx)); 748 bzero(&pcb->inp_sp->sp_out->spidx, 749 sizeof (pcb->inp_sp->sp_in->spidx)); 750 } 751 return error; 752 } 753 754 #ifdef INET6 755 static int 756 ipsec6_setspidx_in6pcb(m, pcb) 757 struct mbuf *m; 758 struct in6pcb *pcb; 759 { 760 struct secpolicyindex *spidx; 761 int error; 762 763 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 764 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 765 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 766 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 767 768 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 769 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 770 771 spidx = &pcb->in6p_sp->sp_in->spidx; 772 error = ipsec_setspidx(m, spidx, 1); 773 if (error) 774 goto bad; 775 spidx->dir = IPSEC_DIR_INBOUND; 776 777 spidx = &pcb->in6p_sp->sp_out->spidx; 778 error = ipsec_setspidx(m, spidx, 1); 779 if (error) 780 goto bad; 781 spidx->dir = IPSEC_DIR_OUTBOUND; 782 783 return 0; 784 785 bad: 786 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 787 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 788 return error; 789 } 790 #endif 791 792 /* 793 * configure security policy index (src/dst/proto/sport/dport) 794 * by looking at the content of mbuf. 795 * the caller is responsible for error recovery (like clearing up spidx). 796 */ 797 static int 798 ipsec_setspidx(m, spidx, needport) 799 struct mbuf *m; 800 struct secpolicyindex *spidx; 801 int needport; 802 { 803 struct ip *ip = NULL; 804 struct ip ipbuf; 805 u_int v; 806 struct mbuf *n; 807 int len; 808 int error; 809 810 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 811 812 /* 813 * validate m->m_pkthdr.len. we see incorrect length if we 814 * mistakenly call this function with inconsistent mbuf chain 815 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 816 */ 817 len = 0; 818 for (n = m; n; n = n->m_next) 819 len += n->m_len; 820 if (m->m_pkthdr.len != len) { 821 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 822 printf("ipsec_setspidx: " 823 "total of m_len(%d) != pkthdr.len(%d), " 824 "ignored.\n", 825 len, m->m_pkthdr.len)); 826 return EINVAL; 827 } 828 829 if (m->m_pkthdr.len < sizeof(struct ip)) { 830 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 831 printf("ipsec_setspidx: " 832 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 833 m->m_pkthdr.len)); 834 return EINVAL; 835 } 836 837 if (m->m_len >= sizeof(*ip)) 838 ip = mtod(m, struct ip *); 839 else { 840 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 841 ip = &ipbuf; 842 } 843 #ifdef _IP_VHL 844 v = _IP_VHL_V(ip->ip_vhl); 845 #else 846 v = ip->ip_v; 847 #endif 848 switch (v) { 849 case 4: 850 error = ipsec4_setspidx_ipaddr(m, spidx); 851 if (error) 852 return error; 853 ipsec4_get_ulp(m, spidx, needport); 854 return 0; 855 #ifdef INET6 856 case 6: 857 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 858 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 859 printf("ipsec_setspidx: " 860 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 861 "ignored.\n", m->m_pkthdr.len)); 862 return EINVAL; 863 } 864 error = ipsec6_setspidx_ipaddr(m, spidx); 865 if (error) 866 return error; 867 ipsec6_get_ulp(m, spidx, needport); 868 return 0; 869 #endif 870 default: 871 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 872 printf("ipsec_setspidx: " 873 "unknown IP version %u, ignored.\n", v)); 874 return EINVAL; 875 } 876 } 877 878 static void 879 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 880 { 881 u_int8_t nxt; 882 int off; 883 884 /* sanity check */ 885 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 886 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), 887 ("ipsec4_get_ulp: packet too short")); 888 889 /* NB: ip_input() flips it into host endian XXX need more checking */ 890 if (m->m_len >= sizeof(struct ip)) { 891 struct ip *ip = mtod(m, struct ip *); 892 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 893 goto done; 894 #ifdef _IP_VHL 895 off = _IP_VHL_HL(ip->ip_vhl) << 2; 896 #else 897 off = ip->ip_hl << 2; 898 #endif 899 nxt = ip->ip_p; 900 } else { 901 struct ip ih; 902 903 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 904 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 905 goto done; 906 #ifdef _IP_VHL 907 off = _IP_VHL_HL(ih.ip_vhl) << 2; 908 #else 909 off = ih.ip_hl << 2; 910 #endif 911 nxt = ih.ip_p; 912 } 913 914 while (off < m->m_pkthdr.len) { 915 struct ip6_ext ip6e; 916 struct tcphdr th; 917 struct udphdr uh; 918 919 switch (nxt) { 920 case IPPROTO_TCP: 921 spidx->ul_proto = nxt; 922 if (!needport) 923 goto done_proto; 924 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 925 goto done; 926 m_copydata(m, off, sizeof (th), (caddr_t) &th); 927 spidx->src.sin.sin_port = th.th_sport; 928 spidx->dst.sin.sin_port = th.th_dport; 929 return; 930 case IPPROTO_UDP: 931 spidx->ul_proto = nxt; 932 if (!needport) 933 goto done_proto; 934 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 935 goto done; 936 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 937 spidx->src.sin.sin_port = uh.uh_sport; 938 spidx->dst.sin.sin_port = uh.uh_dport; 939 return; 940 case IPPROTO_AH: 941 if (m->m_pkthdr.len > off + sizeof(ip6e)) 942 goto done; 943 /* XXX sigh, this works but is totally bogus */ 944 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 945 off += (ip6e.ip6e_len + 2) << 2; 946 nxt = ip6e.ip6e_nxt; 947 break; 948 case IPPROTO_ICMP: 949 default: 950 /* XXX intermediate headers??? */ 951 spidx->ul_proto = nxt; 952 goto done_proto; 953 } 954 } 955 done: 956 spidx->ul_proto = IPSEC_ULPROTO_ANY; 957 done_proto: 958 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 959 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 960 } 961 962 /* assumes that m is sane */ 963 static int 964 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 965 { 966 static const struct sockaddr_in template = { 967 sizeof (struct sockaddr_in), 968 AF_INET, 969 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 970 }; 971 972 spidx->src.sin = template; 973 spidx->dst.sin = template; 974 975 if (m->m_len < sizeof (struct ip)) { 976 m_copydata(m, offsetof(struct ip, ip_src), 977 sizeof (struct in_addr), 978 (caddr_t) &spidx->src.sin.sin_addr); 979 m_copydata(m, offsetof(struct ip, ip_dst), 980 sizeof (struct in_addr), 981 (caddr_t) &spidx->dst.sin.sin_addr); 982 } else { 983 struct ip *ip = mtod(m, struct ip *); 984 spidx->src.sin.sin_addr = ip->ip_src; 985 spidx->dst.sin.sin_addr = ip->ip_dst; 986 } 987 988 spidx->prefs = sizeof(struct in_addr) << 3; 989 spidx->prefd = sizeof(struct in_addr) << 3; 990 991 return 0; 992 } 993 994 #ifdef INET6 995 static void 996 ipsec6_get_ulp(m, spidx, needport) 997 struct mbuf *m; 998 struct secpolicyindex *spidx; 999 int needport; 1000 { 1001 int off, nxt; 1002 struct tcphdr th; 1003 struct udphdr uh; 1004 1005 /* sanity check */ 1006 if (m == NULL) 1007 panic("ipsec6_get_ulp: NULL pointer was passed"); 1008 1009 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1010 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 1011 1012 /* set default */ 1013 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1014 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1015 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1016 1017 nxt = -1; 1018 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1019 if (off < 0 || m->m_pkthdr.len < off) 1020 return; 1021 1022 switch (nxt) { 1023 case IPPROTO_TCP: 1024 spidx->ul_proto = nxt; 1025 if (!needport) 1026 break; 1027 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1028 break; 1029 m_copydata(m, off, sizeof(th), (caddr_t)&th); 1030 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1031 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1032 break; 1033 case IPPROTO_UDP: 1034 spidx->ul_proto = nxt; 1035 if (!needport) 1036 break; 1037 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1038 break; 1039 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 1040 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1041 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1042 break; 1043 case IPPROTO_ICMPV6: 1044 default: 1045 /* XXX intermediate headers??? */ 1046 spidx->ul_proto = nxt; 1047 break; 1048 } 1049 } 1050 1051 /* assumes that m is sane */ 1052 static int 1053 ipsec6_setspidx_ipaddr(m, spidx) 1054 struct mbuf *m; 1055 struct secpolicyindex *spidx; 1056 { 1057 struct ip6_hdr *ip6 = NULL; 1058 struct ip6_hdr ip6buf; 1059 struct sockaddr_in6 *sin6; 1060 1061 if (m->m_len >= sizeof(*ip6)) 1062 ip6 = mtod(m, struct ip6_hdr *); 1063 else { 1064 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 1065 ip6 = &ip6buf; 1066 } 1067 1068 sin6 = (struct sockaddr_in6 *)&spidx->src; 1069 bzero(sin6, sizeof(*sin6)); 1070 sin6->sin6_family = AF_INET6; 1071 sin6->sin6_len = sizeof(struct sockaddr_in6); 1072 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 1073 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1074 sin6->sin6_addr.s6_addr16[1] = 0; 1075 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1076 } 1077 spidx->prefs = sizeof(struct in6_addr) << 3; 1078 1079 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1080 bzero(sin6, sizeof(*sin6)); 1081 sin6->sin6_family = AF_INET6; 1082 sin6->sin6_len = sizeof(struct sockaddr_in6); 1083 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 1084 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1085 sin6->sin6_addr.s6_addr16[1] = 0; 1086 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1087 } 1088 spidx->prefd = sizeof(struct in6_addr) << 3; 1089 1090 return 0; 1091 } 1092 #endif 1093 1094 static void 1095 ipsec_delpcbpolicy(p) 1096 struct inpcbpolicy *p; 1097 { 1098 free(p, M_SECA); 1099 } 1100 1101 /* initialize policy in PCB */ 1102 int 1103 ipsec_init_policy(so, pcb_sp) 1104 struct socket *so; 1105 struct inpcbpolicy **pcb_sp; 1106 { 1107 struct inpcbpolicy *new; 1108 1109 /* sanity check. */ 1110 if (so == NULL || pcb_sp == NULL) 1111 panic("ipsec_init_policy: NULL pointer was passed"); 1112 1113 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 1114 M_SECA, M_NOWAIT|M_ZERO); 1115 if (new == NULL) { 1116 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 1117 return ENOBUFS; 1118 } 1119 1120 if (IPSEC_PRIVILEGED_SO(so)) 1121 new->priv = 1; 1122 else 1123 new->priv = 0; 1124 1125 if ((new->sp_in = KEY_NEWSP()) == NULL) { 1126 ipsec_delpcbpolicy(new); 1127 return ENOBUFS; 1128 } 1129 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 1130 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 1131 1132 if ((new->sp_out = KEY_NEWSP()) == NULL) { 1133 KEY_FREESP(&new->sp_in); 1134 ipsec_delpcbpolicy(new); 1135 return ENOBUFS; 1136 } 1137 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 1138 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 1139 1140 *pcb_sp = new; 1141 1142 return 0; 1143 } 1144 1145 /* copy old ipsec policy into new */ 1146 int 1147 ipsec_copy_policy(old, new) 1148 struct inpcbpolicy *old, *new; 1149 { 1150 struct secpolicy *sp; 1151 1152 sp = ipsec_deepcopy_policy(old->sp_in); 1153 if (sp) { 1154 KEY_FREESP(&new->sp_in); 1155 new->sp_in = sp; 1156 } else 1157 return ENOBUFS; 1158 1159 sp = ipsec_deepcopy_policy(old->sp_out); 1160 if (sp) { 1161 KEY_FREESP(&new->sp_out); 1162 new->sp_out = sp; 1163 } else 1164 return ENOBUFS; 1165 1166 new->priv = old->priv; 1167 1168 return 0; 1169 } 1170 1171 /* deep-copy a policy in PCB */ 1172 static struct secpolicy * 1173 ipsec_deepcopy_policy(src) 1174 struct secpolicy *src; 1175 { 1176 struct ipsecrequest *newchain = NULL; 1177 struct ipsecrequest *p; 1178 struct ipsecrequest **q; 1179 struct ipsecrequest *r; 1180 struct secpolicy *dst; 1181 1182 if (src == NULL) 1183 return NULL; 1184 dst = KEY_NEWSP(); 1185 if (dst == NULL) 1186 return NULL; 1187 1188 /* 1189 * deep-copy IPsec request chain. This is required since struct 1190 * ipsecrequest is not reference counted. 1191 */ 1192 q = &newchain; 1193 for (p = src->req; p; p = p->next) { 1194 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest), 1195 M_SECA, M_NOWAIT); 1196 if (*q == NULL) 1197 goto fail; 1198 bzero(*q, sizeof(**q)); 1199 (*q)->next = NULL; 1200 1201 (*q)->saidx.proto = p->saidx.proto; 1202 (*q)->saidx.mode = p->saidx.mode; 1203 (*q)->level = p->level; 1204 (*q)->saidx.reqid = p->saidx.reqid; 1205 1206 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1207 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1208 1209 (*q)->sav = NULL; 1210 (*q)->sp = dst; 1211 1212 q = &((*q)->next); 1213 } 1214 1215 dst->req = newchain; 1216 dst->state = src->state; 1217 dst->policy = src->policy; 1218 /* do not touch the refcnt fields */ 1219 1220 return dst; 1221 1222 fail: 1223 for (p = newchain; p; p = r) { 1224 r = p->next; 1225 free(p, M_SECA); 1226 p = NULL; 1227 } 1228 return NULL; 1229 } 1230 1231 /* set policy and ipsec request if present. */ 1232 static int 1233 ipsec_set_policy( 1234 struct secpolicy **pcb_sp, 1235 int optname, 1236 caddr_t request, 1237 size_t len, 1238 int priv 1239 ) 1240 { 1241 struct sadb_x_policy *xpl; 1242 struct secpolicy *newsp = NULL; 1243 int error; 1244 1245 /* sanity check. */ 1246 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1247 return EINVAL; 1248 if (len < sizeof(*xpl)) 1249 return EINVAL; 1250 xpl = (struct sadb_x_policy *)request; 1251 1252 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1253 printf("ipsec_set_policy: passed policy\n"); 1254 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1255 1256 /* check policy type */ 1257 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1258 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1259 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1260 return EINVAL; 1261 1262 /* check privileged socket */ 1263 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1264 return EACCES; 1265 1266 /* allocation new SP entry */ 1267 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1268 return error; 1269 1270 newsp->state = IPSEC_SPSTATE_ALIVE; 1271 1272 /* clear old SP and set new SP */ 1273 KEY_FREESP(pcb_sp); 1274 *pcb_sp = newsp; 1275 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1276 printf("ipsec_set_policy: new policy\n"); 1277 kdebug_secpolicy(newsp)); 1278 1279 return 0; 1280 } 1281 1282 static int 1283 ipsec_get_policy(pcb_sp, mp) 1284 struct secpolicy *pcb_sp; 1285 struct mbuf **mp; 1286 { 1287 1288 /* sanity check. */ 1289 if (pcb_sp == NULL || mp == NULL) 1290 return EINVAL; 1291 1292 *mp = key_sp2msg(pcb_sp); 1293 if (!*mp) { 1294 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1295 return ENOBUFS; 1296 } 1297 1298 (*mp)->m_type = MT_DATA; 1299 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1300 printf("ipsec_get_policy:\n"); 1301 kdebug_mbuf(*mp)); 1302 1303 return 0; 1304 } 1305 1306 int 1307 ipsec4_set_policy(inp, optname, request, len, priv) 1308 struct inpcb *inp; 1309 int optname; 1310 caddr_t request; 1311 size_t len; 1312 int priv; 1313 { 1314 struct sadb_x_policy *xpl; 1315 struct secpolicy **pcb_sp; 1316 1317 /* sanity check. */ 1318 if (inp == NULL || request == NULL) 1319 return EINVAL; 1320 if (len < sizeof(*xpl)) 1321 return EINVAL; 1322 xpl = (struct sadb_x_policy *)request; 1323 1324 IPSEC_ASSERT(inp->inp_sp != NULL, 1325 ("ipsec4_set_policy(): null inp->in_sp")); 1326 1327 /* select direction */ 1328 switch (xpl->sadb_x_policy_dir) { 1329 case IPSEC_DIR_INBOUND: 1330 pcb_sp = &inp->inp_sp->sp_in; 1331 break; 1332 case IPSEC_DIR_OUTBOUND: 1333 pcb_sp = &inp->inp_sp->sp_out; 1334 break; 1335 default: 1336 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1337 xpl->sadb_x_policy_dir)); 1338 return EINVAL; 1339 } 1340 1341 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1342 } 1343 1344 int 1345 ipsec4_get_policy(inp, request, len, mp) 1346 struct inpcb *inp; 1347 caddr_t request; 1348 size_t len; 1349 struct mbuf **mp; 1350 { 1351 struct sadb_x_policy *xpl; 1352 struct secpolicy *pcb_sp; 1353 1354 /* sanity check. */ 1355 if (inp == NULL || request == NULL || mp == NULL) 1356 return EINVAL; 1357 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1358 if (len < sizeof(*xpl)) 1359 return EINVAL; 1360 xpl = (struct sadb_x_policy *)request; 1361 1362 /* select direction */ 1363 switch (xpl->sadb_x_policy_dir) { 1364 case IPSEC_DIR_INBOUND: 1365 pcb_sp = inp->inp_sp->sp_in; 1366 break; 1367 case IPSEC_DIR_OUTBOUND: 1368 pcb_sp = inp->inp_sp->sp_out; 1369 break; 1370 default: 1371 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1372 xpl->sadb_x_policy_dir)); 1373 return EINVAL; 1374 } 1375 1376 return ipsec_get_policy(pcb_sp, mp); 1377 } 1378 1379 /* delete policy in PCB */ 1380 int 1381 ipsec4_delete_pcbpolicy(inp) 1382 struct inpcb *inp; 1383 { 1384 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1385 1386 if (inp->inp_sp == NULL) 1387 return 0; 1388 1389 if (inp->inp_sp->sp_in != NULL) 1390 KEY_FREESP(&inp->inp_sp->sp_in); 1391 1392 if (inp->inp_sp->sp_out != NULL) 1393 KEY_FREESP(&inp->inp_sp->sp_out); 1394 1395 ipsec_delpcbpolicy(inp->inp_sp); 1396 inp->inp_sp = NULL; 1397 1398 return 0; 1399 } 1400 1401 #ifdef INET6 1402 int 1403 ipsec6_set_policy(in6p, optname, request, len, priv) 1404 struct in6pcb *in6p; 1405 int optname; 1406 caddr_t request; 1407 size_t len; 1408 int priv; 1409 { 1410 struct sadb_x_policy *xpl; 1411 struct secpolicy **pcb_sp; 1412 1413 /* sanity check. */ 1414 if (in6p == NULL || request == NULL) 1415 return EINVAL; 1416 if (len < sizeof(*xpl)) 1417 return EINVAL; 1418 xpl = (struct sadb_x_policy *)request; 1419 1420 /* select direction */ 1421 switch (xpl->sadb_x_policy_dir) { 1422 case IPSEC_DIR_INBOUND: 1423 pcb_sp = &in6p->in6p_sp->sp_in; 1424 break; 1425 case IPSEC_DIR_OUTBOUND: 1426 pcb_sp = &in6p->in6p_sp->sp_out; 1427 break; 1428 default: 1429 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1430 xpl->sadb_x_policy_dir)); 1431 return EINVAL; 1432 } 1433 1434 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1435 } 1436 1437 int 1438 ipsec6_get_policy(in6p, request, len, mp) 1439 struct in6pcb *in6p; 1440 caddr_t request; 1441 size_t len; 1442 struct mbuf **mp; 1443 { 1444 struct sadb_x_policy *xpl; 1445 struct secpolicy *pcb_sp; 1446 1447 /* sanity check. */ 1448 if (in6p == NULL || request == NULL || mp == NULL) 1449 return EINVAL; 1450 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1451 if (len < sizeof(*xpl)) 1452 return EINVAL; 1453 xpl = (struct sadb_x_policy *)request; 1454 1455 /* select direction */ 1456 switch (xpl->sadb_x_policy_dir) { 1457 case IPSEC_DIR_INBOUND: 1458 pcb_sp = in6p->in6p_sp->sp_in; 1459 break; 1460 case IPSEC_DIR_OUTBOUND: 1461 pcb_sp = in6p->in6p_sp->sp_out; 1462 break; 1463 default: 1464 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1465 xpl->sadb_x_policy_dir)); 1466 return EINVAL; 1467 } 1468 1469 return ipsec_get_policy(pcb_sp, mp); 1470 } 1471 1472 int 1473 ipsec6_delete_pcbpolicy(in6p) 1474 struct in6pcb *in6p; 1475 { 1476 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1477 1478 if (in6p->in6p_sp == NULL) 1479 return 0; 1480 1481 if (in6p->in6p_sp->sp_in != NULL) 1482 KEY_FREESP(&in6p->in6p_sp->sp_in); 1483 1484 if (in6p->in6p_sp->sp_out != NULL) 1485 KEY_FREESP(&in6p->in6p_sp->sp_out); 1486 1487 ipsec_delpcbpolicy(in6p->in6p_sp); 1488 in6p->in6p_sp = NULL; 1489 1490 return 0; 1491 } 1492 #endif 1493 1494 /* 1495 * return current level. 1496 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1497 */ 1498 u_int 1499 ipsec_get_reqlevel(isr) 1500 struct ipsecrequest *isr; 1501 { 1502 u_int level = 0; 1503 u_int esp_trans_deflev, esp_net_deflev; 1504 u_int ah_trans_deflev, ah_net_deflev; 1505 1506 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1507 ("ipsec_get_reqlevel: null argument")); 1508 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1509 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1510 isr->sp->spidx.src.sa.sa_family, 1511 isr->sp->spidx.dst.sa.sa_family)); 1512 1513 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1514 #define IPSEC_CHECK_DEFAULT(lev) \ 1515 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1516 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1517 ? (ipsec_debug \ 1518 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1519 (lev), IPSEC_LEVEL_REQUIRE) \ 1520 : 0), \ 1521 (lev) = IPSEC_LEVEL_REQUIRE, \ 1522 (lev) \ 1523 : (lev)) 1524 1525 /* set default level */ 1526 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1527 #ifdef INET 1528 case AF_INET: 1529 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1530 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1531 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1532 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1533 break; 1534 #endif 1535 #ifdef INET6 1536 case AF_INET6: 1537 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1538 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1539 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1540 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1541 break; 1542 #endif /* INET6 */ 1543 default: 1544 panic("key_get_reqlevel: unknown af %u", 1545 isr->sp->spidx.src.sa.sa_family); 1546 } 1547 1548 #undef IPSEC_CHECK_DEFAULT 1549 1550 /* set level */ 1551 switch (isr->level) { 1552 case IPSEC_LEVEL_DEFAULT: 1553 switch (isr->saidx.proto) { 1554 case IPPROTO_ESP: 1555 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1556 level = esp_net_deflev; 1557 else 1558 level = esp_trans_deflev; 1559 break; 1560 case IPPROTO_AH: 1561 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1562 level = ah_net_deflev; 1563 else 1564 level = ah_trans_deflev; 1565 break; 1566 case IPPROTO_IPCOMP: 1567 /* 1568 * we don't really care, as IPcomp document says that 1569 * we shouldn't compress small packets 1570 */ 1571 level = IPSEC_LEVEL_USE; 1572 break; 1573 default: 1574 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1575 isr->saidx.proto); 1576 } 1577 break; 1578 1579 case IPSEC_LEVEL_USE: 1580 case IPSEC_LEVEL_REQUIRE: 1581 level = isr->level; 1582 break; 1583 case IPSEC_LEVEL_UNIQUE: 1584 level = IPSEC_LEVEL_REQUIRE; 1585 break; 1586 1587 default: 1588 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1589 isr->level); 1590 } 1591 1592 return level; 1593 } 1594 1595 /* 1596 * Check security policy requirements against the actual 1597 * packet contents. Return one if the packet should be 1598 * reject as "invalid"; otherwiser return zero to have the 1599 * packet treated as "valid". 1600 * 1601 * OUT: 1602 * 0: valid 1603 * 1: invalid 1604 */ 1605 int 1606 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1607 { 1608 struct ipsecrequest *isr; 1609 int need_auth; 1610 1611 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1612 printf("ipsec_in_reject: using SP\n"); 1613 kdebug_secpolicy(sp)); 1614 1615 /* check policy */ 1616 switch (sp->policy) { 1617 case IPSEC_POLICY_DISCARD: 1618 return 1; 1619 case IPSEC_POLICY_BYPASS: 1620 case IPSEC_POLICY_NONE: 1621 return 0; 1622 } 1623 1624 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1625 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1626 1627 /* XXX should compare policy against ipsec header history */ 1628 1629 need_auth = 0; 1630 for (isr = sp->req; isr != NULL; isr = isr->next) { 1631 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1632 continue; 1633 switch (isr->saidx.proto) { 1634 case IPPROTO_ESP: 1635 if ((m->m_flags & M_DECRYPTED) == 0) { 1636 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1637 printf("ipsec_in_reject: ESP m_flags:%x\n", 1638 m->m_flags)); 1639 return 1; 1640 } 1641 1642 if (!need_auth && 1643 isr->sav != NULL && 1644 isr->sav->tdb_authalgxform != NULL && 1645 (m->m_flags & M_AUTHIPDGM) == 0) { 1646 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1647 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1648 m->m_flags)); 1649 return 1; 1650 } 1651 break; 1652 case IPPROTO_AH: 1653 need_auth = 1; 1654 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1655 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1656 printf("ipsec_in_reject: AH m_flags:%x\n", 1657 m->m_flags)); 1658 return 1; 1659 } 1660 break; 1661 case IPPROTO_IPCOMP: 1662 /* 1663 * we don't really care, as IPcomp document 1664 * says that we shouldn't compress small 1665 * packets, IPComp policy should always be 1666 * treated as being in "use" level. 1667 */ 1668 break; 1669 } 1670 } 1671 return 0; /* valid */ 1672 } 1673 1674 /* 1675 * Check AH/ESP integrity. 1676 * This function is called from tcp_input(), udp_input(), 1677 * and {ah,esp}4_input for tunnel mode 1678 */ 1679 int 1680 ipsec4_in_reject(m, inp) 1681 struct mbuf *m; 1682 struct inpcb *inp; 1683 { 1684 struct secpolicy *sp; 1685 int error; 1686 int result; 1687 1688 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1689 1690 /* get SP for this packet. 1691 * When we are called from ip_forward(), we call 1692 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1693 */ 1694 if (inp == NULL) 1695 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1696 else 1697 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1698 IN4PCB_TO_PCB(inp), &error); 1699 1700 if (sp != NULL) { 1701 result = ipsec_in_reject(sp, m); 1702 if (result) 1703 newipsecstat.ips_in_polvio++; 1704 KEY_FREESP(&sp); 1705 } else { 1706 result = 0; /* XXX should be panic ? 1707 * -> No, there may be error. */ 1708 } 1709 return result; 1710 } 1711 1712 1713 #ifdef INET6 1714 /* 1715 * Check AH/ESP integrity. 1716 * This function is called from tcp6_input(), udp6_input(), 1717 * and {ah,esp}6_input for tunnel mode 1718 */ 1719 int 1720 ipsec6_in_reject(m, in6p) 1721 struct mbuf *m; 1722 struct in6pcb *in6p; 1723 { 1724 struct secpolicy *sp = NULL; 1725 int error; 1726 int result; 1727 1728 /* sanity check */ 1729 if (m == NULL) 1730 return 0; /* XXX should be panic ? */ 1731 1732 /* get SP for this packet. 1733 * When we are called from ip_forward(), we call 1734 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1735 */ 1736 if (in6p == NULL) 1737 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1738 else 1739 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1740 IN6PCB_TO_PCB(in6p), 1741 &error); 1742 1743 if (sp != NULL) { 1744 result = ipsec_in_reject(sp, m); 1745 if (result) 1746 newipsecstat.ips_in_polvio++; 1747 KEY_FREESP(&sp); 1748 } else { 1749 result = 0; 1750 } 1751 return result; 1752 } 1753 #endif 1754 1755 /* 1756 * compute the byte size to be occupied by IPsec header. 1757 * in case it is tunneled, it includes the size of outer IP header. 1758 * NOTE: SP passed is free in this function. 1759 */ 1760 static size_t 1761 ipsec_hdrsiz(struct secpolicy *sp) 1762 { 1763 struct ipsecrequest *isr; 1764 size_t siz; 1765 1766 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1767 printf("ipsec_hdrsiz: using SP\n"); 1768 kdebug_secpolicy(sp)); 1769 1770 switch (sp->policy) { 1771 case IPSEC_POLICY_DISCARD: 1772 case IPSEC_POLICY_BYPASS: 1773 case IPSEC_POLICY_NONE: 1774 return 0; 1775 } 1776 1777 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1778 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1779 1780 siz = 0; 1781 for (isr = sp->req; isr != NULL; isr = isr->next) { 1782 size_t clen = 0; 1783 1784 switch (isr->saidx.proto) { 1785 case IPPROTO_ESP: 1786 clen = esp_hdrsiz(isr->sav); 1787 break; 1788 case IPPROTO_AH: 1789 clen = ah_hdrsiz(isr->sav); 1790 break; 1791 case IPPROTO_IPCOMP: 1792 clen = sizeof(struct ipcomp); 1793 break; 1794 } 1795 1796 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1797 switch (isr->saidx.dst.sa.sa_family) { 1798 case AF_INET: 1799 clen += sizeof(struct ip); 1800 break; 1801 #ifdef INET6 1802 case AF_INET6: 1803 clen += sizeof(struct ip6_hdr); 1804 break; 1805 #endif 1806 default: 1807 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1808 "unknown AF %d in IPsec tunnel SA\n", 1809 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1810 break; 1811 } 1812 } 1813 siz += clen; 1814 } 1815 1816 return siz; 1817 } 1818 1819 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1820 size_t 1821 ipsec4_hdrsiz(m, dir, inp) 1822 struct mbuf *m; 1823 u_int dir; 1824 struct inpcb *inp; 1825 { 1826 struct secpolicy *sp; 1827 int error; 1828 size_t size; 1829 1830 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1831 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1832 ("ipsec4_hdrsize: socket w/o inpcb")); 1833 1834 /* get SP for this packet. 1835 * When we are called from ip_forward(), we call 1836 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1837 */ 1838 if (inp == NULL) 1839 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1840 else 1841 sp = ipsec_getpolicybysock(m, dir, 1842 IN4PCB_TO_PCB(inp), &error); 1843 1844 if (sp != NULL) { 1845 size = ipsec_hdrsiz(sp); 1846 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1847 printf("ipsec4_hdrsiz: size:%lu.\n", 1848 (unsigned long)size)); 1849 1850 KEY_FREESP(&sp); 1851 } else { 1852 size = 0; /* XXX should be panic ? */ 1853 } 1854 return size; 1855 } 1856 1857 #ifdef INET6 1858 /* This function is called from ipsec6_hdrsize_tcp(), 1859 * and maybe from ip6_forward.() 1860 */ 1861 size_t 1862 ipsec6_hdrsiz(m, dir, in6p) 1863 struct mbuf *m; 1864 u_int dir; 1865 struct in6pcb *in6p; 1866 { 1867 struct secpolicy *sp; 1868 int error; 1869 size_t size; 1870 1871 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1872 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1873 ("ipsec6_hdrsize: socket w/o inpcb")); 1874 1875 /* get SP for this packet */ 1876 /* XXX Is it right to call with IP_FORWARDING. */ 1877 if (in6p == NULL) 1878 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1879 else 1880 sp = ipsec_getpolicybysock(m, dir, 1881 IN6PCB_TO_PCB(in6p), 1882 &error); 1883 1884 if (sp == NULL) 1885 return 0; 1886 size = ipsec_hdrsiz(sp); 1887 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1888 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1889 KEY_FREESP(&sp); 1890 1891 return size; 1892 } 1893 #endif /*INET6*/ 1894 1895 /* 1896 * Check the variable replay window. 1897 * ipsec_chkreplay() performs replay check before ICV verification. 1898 * ipsec_updatereplay() updates replay bitmap. This must be called after 1899 * ICV verification (it also performs replay check, which is usually done 1900 * beforehand). 1901 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1902 * 1903 * based on RFC 2401. 1904 */ 1905 int 1906 ipsec_chkreplay(seq, sav) 1907 u_int32_t seq; 1908 struct secasvar *sav; 1909 { 1910 const struct secreplay *replay; 1911 u_int32_t diff; 1912 int fr; 1913 u_int32_t wsizeb; /* constant: bits of window size */ 1914 int frlast; /* constant: last frame */ 1915 1916 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 1917 1918 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1919 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1920 1921 replay = sav->replay; 1922 1923 if (replay->wsize == 0) 1924 return 1; /* no need to check replay. */ 1925 1926 /* constant */ 1927 frlast = replay->wsize - 1; 1928 wsizeb = replay->wsize << 3; 1929 1930 /* sequence number of 0 is invalid */ 1931 if (seq == 0) 1932 return 0; 1933 1934 /* first time is always okay */ 1935 if (replay->count == 0) 1936 return 1; 1937 1938 if (seq > replay->lastseq) { 1939 /* larger sequences are okay */ 1940 return 1; 1941 } else { 1942 /* seq is equal or less than lastseq. */ 1943 diff = replay->lastseq - seq; 1944 1945 /* over range to check, i.e. too old or wrapped */ 1946 if (diff >= wsizeb) 1947 return 0; 1948 1949 fr = frlast - diff / 8; 1950 1951 /* this packet already seen ? */ 1952 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1953 return 0; 1954 1955 /* out of order but good */ 1956 return 1; 1957 } 1958 } 1959 1960 /* 1961 * check replay counter whether to update or not. 1962 * OUT: 0: OK 1963 * 1: NG 1964 */ 1965 int 1966 ipsec_updatereplay(seq, sav) 1967 u_int32_t seq; 1968 struct secasvar *sav; 1969 { 1970 struct secreplay *replay; 1971 u_int32_t diff; 1972 int fr; 1973 u_int32_t wsizeb; /* constant: bits of window size */ 1974 int frlast; /* constant: last frame */ 1975 1976 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 1977 1978 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 1979 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 1980 1981 replay = sav->replay; 1982 1983 if (replay->wsize == 0) 1984 goto ok; /* no need to check replay. */ 1985 1986 /* constant */ 1987 frlast = replay->wsize - 1; 1988 wsizeb = replay->wsize << 3; 1989 1990 /* sequence number of 0 is invalid */ 1991 if (seq == 0) 1992 return 1; 1993 1994 /* first time */ 1995 if (replay->count == 0) { 1996 replay->lastseq = seq; 1997 bzero(replay->bitmap, replay->wsize); 1998 (replay->bitmap)[frlast] = 1; 1999 goto ok; 2000 } 2001 2002 if (seq > replay->lastseq) { 2003 /* seq is larger than lastseq. */ 2004 diff = seq - replay->lastseq; 2005 2006 /* new larger sequence number */ 2007 if (diff < wsizeb) { 2008 /* In window */ 2009 /* set bit for this packet */ 2010 vshiftl(replay->bitmap, diff, replay->wsize); 2011 (replay->bitmap)[frlast] |= 1; 2012 } else { 2013 /* this packet has a "way larger" */ 2014 bzero(replay->bitmap, replay->wsize); 2015 (replay->bitmap)[frlast] = 1; 2016 } 2017 replay->lastseq = seq; 2018 2019 /* larger is good */ 2020 } else { 2021 /* seq is equal or less than lastseq. */ 2022 diff = replay->lastseq - seq; 2023 2024 /* over range to check, i.e. too old or wrapped */ 2025 if (diff >= wsizeb) 2026 return 1; 2027 2028 fr = frlast - diff / 8; 2029 2030 /* this packet already seen ? */ 2031 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2032 return 1; 2033 2034 /* mark as seen */ 2035 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2036 2037 /* out of order but good */ 2038 } 2039 2040 ok: 2041 if (replay->count == ~0) { 2042 2043 /* set overflow flag */ 2044 replay->overflow++; 2045 2046 /* don't increment, no more packets accepted */ 2047 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2048 return 1; 2049 2050 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2051 replay->overflow, ipsec_logsastr(sav))); 2052 } 2053 2054 replay->count++; 2055 2056 return 0; 2057 } 2058 2059 /* 2060 * shift variable length bunffer to left. 2061 * IN: bitmap: pointer to the buffer 2062 * nbit: the number of to shift. 2063 * wsize: buffer size (bytes). 2064 */ 2065 static void 2066 vshiftl(bitmap, nbit, wsize) 2067 unsigned char *bitmap; 2068 int nbit, wsize; 2069 { 2070 int s, j, i; 2071 unsigned char over; 2072 2073 for (j = 0; j < nbit; j += 8) { 2074 s = (nbit - j < 8) ? (nbit - j): 8; 2075 bitmap[0] <<= s; 2076 for (i = 1; i < wsize; i++) { 2077 over = (bitmap[i] >> (8 - s)); 2078 bitmap[i] <<= s; 2079 bitmap[i-1] |= over; 2080 } 2081 } 2082 2083 return; 2084 } 2085 2086 /* Return a printable string for the IPv4 address. */ 2087 static char * 2088 inet_ntoa4(struct in_addr ina) 2089 { 2090 static char buf[4][4 * sizeof "123" + 4]; 2091 unsigned char *ucp = (unsigned char *) &ina; 2092 static int i = 3; 2093 2094 i = (i + 1) % 4; 2095 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2096 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2097 return (buf[i]); 2098 } 2099 2100 /* Return a printable string for the address. */ 2101 const char * 2102 ipsec_address(union sockaddr_union* sa) 2103 { 2104 switch (sa->sa.sa_family) { 2105 #if INET 2106 case AF_INET: 2107 return inet_ntoa4(sa->sin.sin_addr); 2108 #endif /* INET */ 2109 2110 #if INET6 2111 case AF_INET6: 2112 return ip6_sprintf(&sa->sin6.sin6_addr); 2113 #endif /* INET6 */ 2114 2115 default: 2116 return "(unknown address family)"; 2117 } 2118 } 2119 2120 const char * 2121 ipsec_logsastr(sav) 2122 struct secasvar *sav; 2123 { 2124 static char buf[256]; 2125 char *p; 2126 struct secasindex *saidx = &sav->sah->saidx; 2127 2128 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2129 ("ipsec_logsastr: address family mismatch")); 2130 2131 p = buf; 2132 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2133 while (p && *p) 2134 p++; 2135 /* NB: only use ipsec_address on one address at a time */ 2136 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2137 ipsec_address(&saidx->src)); 2138 while (p && *p) 2139 p++; 2140 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2141 ipsec_address(&saidx->dst)); 2142 2143 return buf; 2144 } 2145 2146 void 2147 ipsec_dumpmbuf(m) 2148 struct mbuf *m; 2149 { 2150 int totlen; 2151 int i; 2152 u_char *p; 2153 2154 totlen = 0; 2155 printf("---\n"); 2156 while (m) { 2157 p = mtod(m, u_char *); 2158 for (i = 0; i < m->m_len; i++) { 2159 printf("%02x ", p[i]); 2160 totlen++; 2161 if (totlen % 16 == 0) 2162 printf("\n"); 2163 } 2164 m = m->m_next; 2165 } 2166 if (totlen % 16 != 0) 2167 printf("\n"); 2168 printf("---\n"); 2169 } 2170 2171 /* XXX this stuff doesn't belong here... */ 2172 2173 static struct xformsw* xforms = NULL; 2174 2175 /* 2176 * Register a transform; typically at system startup. 2177 */ 2178 void 2179 xform_register(struct xformsw* xsp) 2180 { 2181 xsp->xf_next = xforms; 2182 xforms = xsp; 2183 } 2184 2185 /* 2186 * Initialize transform support in an sav. 2187 */ 2188 int 2189 xform_init(struct secasvar *sav, int xftype) 2190 { 2191 struct xformsw *xsp; 2192 2193 if (sav->tdb_xform != NULL) /* previously initialized */ 2194 return 0; 2195 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2196 if (xsp->xf_type == xftype) 2197 return (*xsp->xf_init)(sav, xsp); 2198 2199 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2200 return EINVAL; 2201 } 2202 2203 #ifdef __NetBSD__ 2204 void 2205 ipsec_attach(void) 2206 { 2207 printf("initializing IPsec..."); 2208 ah_attach(); 2209 esp_attach(); 2210 ipcomp_attach(); 2211 ipe4_attach(); 2212 #ifdef TCP_SIGNATURE 2213 tcpsignature_attach(); 2214 #endif 2215 printf(" done\n"); 2216 } 2217 #endif /* __NetBSD__ */ 2218
Indexes created Tue Sep 30 11:09:46 GMT 2025