1 /* $NetBSD: ipsec.c,v 1.23 2006/06/10 11:30:37 kardel 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 1.23 2006/06/10 11:30:37 kardel 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 if (bcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, 295 sizeof(spidx))) { 296 if (!key_cmpspidx_withmask(&pcbsp->sp_cache[dir].cachesp->spidx, 297 &spidx)) 298 return NULL; 299 pcbsp->sp_cache[dir].cacheidx = spidx; 300 } 301 } else { 302 /* 303 * The pcb is connected, and the L4 code is sure that: 304 * - outgoing side uses inp_[lf]addr 305 * - incoming side looks up policy after inpcb lookup 306 * and address pair is know to be stable. We do not need 307 * to generate spidx again, nor check the address match again. 308 * 309 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 310 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 311 */ 312 } 313 314 pcbsp->sp_cache[dir].cachesp->lastused = time_second; 315 pcbsp->sp_cache[dir].cachesp->refcnt++; 316 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 317 printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n", 318 pcbsp->sp_cache[dir].cachesp->refcnt, 319 pcbsp->sp_cache[dir].cachesp)); 320 return pcbsp->sp_cache[dir].cachesp; 321 } 322 323 static int 324 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 325 struct secpolicy *sp, int dir) 326 { 327 328 switch (dir) { 329 case IPSEC_DIR_INBOUND: 330 case IPSEC_DIR_OUTBOUND: 331 break; 332 default: 333 return EINVAL; 334 } 335 #ifdef DIAGNOSTIC 336 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 337 panic("dir too big in ipsec_fillpcbcache"); 338 #endif 339 340 if (pcbsp->sp_cache[dir].cachesp) 341 KEY_FREESP(&pcbsp->sp_cache[dir].cachesp); 342 pcbsp->sp_cache[dir].cachesp = NULL; 343 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE; 344 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 345 return EINVAL; 346 } 347 pcbsp->sp_cache[dir].cachesp = sp; 348 if (pcbsp->sp_cache[dir].cachesp) { 349 pcbsp->sp_cache[dir].cachesp->refcnt++; 350 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 351 printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n", 352 pcbsp->sp_cache[dir].cachesp->refcnt, 353 pcbsp->sp_cache[dir].cachesp)); 354 355 /* 356 * If the PCB is connected, we can remember a hint to 357 * possibly short-circuit IPsec processing in other places. 358 */ 359 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 360 switch (pcbsp->sp_cache[dir].cachesp->policy) { 361 case IPSEC_POLICY_NONE: 362 case IPSEC_POLICY_BYPASS: 363 pcbsp->sp_cache[dir].cachehint = 364 IPSEC_PCBHINT_NO; 365 break; 366 default: 367 pcbsp->sp_cache[dir].cachehint = 368 IPSEC_PCBHINT_YES; 369 } 370 } 371 } 372 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 373 374 return 0; 375 } 376 377 static int 378 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 379 { 380 int i; 381 382 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 383 if (dir != IPSEC_DIR_ANY && i != dir) 384 continue; 385 if (pcbsp->sp_cache[i].cachesp) 386 KEY_FREESP(&pcbsp->sp_cache[i].cachesp); 387 pcbsp->sp_cache[i].cachesp = NULL; 388 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE; 389 pcbsp->sp_cache[i].cachegen = 0; 390 bzero(&pcbsp->sp_cache[i].cacheidx, 391 sizeof(pcbsp->sp_cache[i].cacheidx)); 392 } 393 return 0; 394 } 395 396 void 397 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 398 { 399 400 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 401 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 402 } 403 404 void 405 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 406 { 407 408 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 409 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 410 } 411 412 void 413 ipsec_invalpcbcacheall(void) 414 { 415 416 if (ipsec_spdgen == UINT_MAX) 417 ipsec_spdgen = 1; 418 else 419 ipsec_spdgen++; 420 } 421 #endif /* __NetBSD__ */ 422 423 /* 424 * Return a held reference to the default SP. 425 */ 426 static struct secpolicy * 427 key_allocsp_default(const char* where, int tag) 428 { 429 struct secpolicy *sp; 430 431 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 432 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 433 434 sp = &ip4_def_policy; 435 if (sp->policy != IPSEC_POLICY_DISCARD && 436 sp->policy != IPSEC_POLICY_NONE) { 437 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 438 sp->policy, IPSEC_POLICY_NONE)); 439 sp->policy = IPSEC_POLICY_NONE; 440 } 441 sp->refcnt++; 442 443 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 444 printf("DP key_allocsp_default returns SP:%p (%u)\n", 445 sp, sp->refcnt)); 446 return sp; 447 } 448 #define KEY_ALLOCSP_DEFAULT() \ 449 key_allocsp_default(__FILE__, __LINE__) 450 451 /* 452 * For OUTBOUND packet having a socket. Searching SPD for packet, 453 * and return a pointer to SP. 454 * OUT: NULL: no apropreate SP found, the following value is set to error. 455 * 0 : bypass 456 * EACCES : discard packet. 457 * ENOENT : ipsec_acquire() in progress, maybe. 458 * others : error occurred. 459 * others: a pointer to SP 460 * 461 * NOTE: IPv6 mapped address concern is implemented here. 462 */ 463 struct secpolicy * 464 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 465 { 466 struct secpolicy *sp; 467 468 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 469 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 470 ("ipsec_getpolicy: invalid direction %u", dir)); 471 472 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 473 if (sp == NULL) /*XXX????*/ 474 sp = KEY_ALLOCSP_DEFAULT(); 475 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 476 return sp; 477 } 478 479 /* 480 * For OUTBOUND packet having a socket. Searching SPD for packet, 481 * and return a pointer to SP. 482 * OUT: NULL: no apropreate SP found, the following value is set to error. 483 * 0 : bypass 484 * EACCES : discard packet. 485 * ENOENT : ipsec_acquire() in progress, maybe. 486 * others : error occurred. 487 * others: a pointer to SP 488 * 489 * NOTE: IPv6 mapped address concern is implemented here. 490 */ 491 static struct secpolicy * 492 ipsec_getpolicybysock(m, dir, inp, error) 493 struct mbuf *m; 494 u_int dir; 495 PCB_T *inp; 496 int *error; 497 { 498 struct inpcbpolicy *pcbsp = NULL; 499 struct secpolicy *currsp = NULL; /* policy on socket */ 500 struct secpolicy *sp; 501 int af; 502 503 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 504 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 505 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 506 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 507 ("ipsec_getpolicybysock: invalid direction %u", dir)); 508 509 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, 510 ("ipsec_getppolicybysock: null socket\n")); 511 512 /* XXX FIXME inpcb/in6pcb vs socket*/ 513 af = PCB_FAMILY(inp); 514 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 515 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 516 517 #ifdef __NetBSD__ 518 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache")); 519 /* If we have a cached entry, and if it is still valid, use it. */ 520 ipsecstat.ips_spdcache_lookup++; 521 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); 522 if (currsp) { 523 *error = 0; 524 return currsp; 525 } 526 ipsecstat.ips_spdcache_miss++; 527 #endif /* __NetBSD__ */ 528 529 switch (af) { 530 case AF_INET: { 531 struct inpcb *in4p = PCB_TO_IN4PCB(inp); 532 /* set spidx in pcb */ 533 *error = ipsec4_setspidx_inpcb(m, in4p); 534 pcbsp = in4p->inp_sp; 535 break; 536 } 537 538 #if defined(INET6) 539 case AF_INET6: { 540 struct in6pcb *in6p = PCB_TO_IN6PCB(inp); 541 /* set spidx in pcb */ 542 *error = ipsec6_setspidx_in6pcb(m, in6p); 543 pcbsp = in6p->in6p_sp; 544 break; 545 } 546 #endif 547 default: 548 *error = EPFNOSUPPORT; 549 break; 550 } 551 if (*error) 552 return NULL; 553 554 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 555 switch (dir) { 556 case IPSEC_DIR_INBOUND: 557 currsp = pcbsp->sp_in; 558 break; 559 case IPSEC_DIR_OUTBOUND: 560 currsp = pcbsp->sp_out; 561 break; 562 } 563 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 564 565 if (pcbsp->priv) { /* when privilieged socket */ 566 switch (currsp->policy) { 567 case IPSEC_POLICY_BYPASS: 568 case IPSEC_POLICY_IPSEC: 569 currsp->refcnt++; 570 sp = currsp; 571 break; 572 573 case IPSEC_POLICY_ENTRUST: 574 /* look for a policy in SPD */ 575 sp = KEY_ALLOCSP(&currsp->spidx, dir); 576 if (sp == NULL) /* no SP found */ 577 sp = KEY_ALLOCSP_DEFAULT(); 578 break; 579 580 default: 581 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 582 "Invalid policy for PCB %d\n", currsp->policy)); 583 *error = EINVAL; 584 return NULL; 585 } 586 } else { /* unpriv, SPD has policy */ 587 sp = KEY_ALLOCSP(&currsp->spidx, dir); 588 if (sp == NULL) { /* no SP found */ 589 switch (currsp->policy) { 590 case IPSEC_POLICY_BYPASS: 591 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 592 "Illegal policy for non-priviliged defined %d\n", 593 currsp->policy)); 594 *error = EINVAL; 595 return NULL; 596 597 case IPSEC_POLICY_ENTRUST: 598 sp = KEY_ALLOCSP_DEFAULT(); 599 break; 600 601 case IPSEC_POLICY_IPSEC: 602 currsp->refcnt++; 603 sp = currsp; 604 break; 605 606 default: 607 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 608 "Invalid policy for PCB %d\n", currsp->policy)); 609 *error = EINVAL; 610 return NULL; 611 } 612 } 613 } 614 IPSEC_ASSERT(sp != NULL, 615 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 616 pcbsp->priv, currsp->policy)); 617 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 618 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 619 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 620 sp, sp->refcnt)); 621 #ifdef __NetBSD__ 622 ipsec_fillpcbcache(pcbsp, m, sp, dir); 623 #endif /* __NetBSD__ */ 624 return sp; 625 } 626 627 /* 628 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 629 * and return a pointer to SP. 630 * OUT: positive: a pointer to the entry for security policy leaf matched. 631 * NULL: no apropreate SP found, the following value is set to error. 632 * 0 : bypass 633 * EACCES : discard packet. 634 * ENOENT : ipsec_acquire() in progress, maybe. 635 * others : error occurred. 636 */ 637 struct secpolicy * 638 ipsec_getpolicybyaddr(m, dir, flag, error) 639 struct mbuf *m; 640 u_int dir; 641 int flag; 642 int *error; 643 { 644 struct secpolicyindex spidx; 645 struct secpolicy *sp; 646 647 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 648 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 649 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 650 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 651 652 sp = NULL; 653 if (key_havesp(dir)) { 654 /* Make an index to look for a policy. */ 655 *error = ipsec_setspidx(m, &spidx, 656 (flag & IP_FORWARDING) ? 0 : 1); 657 if (*error != 0) { 658 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 659 " dir %u flag %u\n", dir, flag)); 660 bzero(&spidx, sizeof (spidx)); 661 return NULL; 662 } 663 spidx.dir = dir; 664 665 sp = KEY_ALLOCSP(&spidx, dir); 666 } 667 if (sp == NULL) /* no SP found, use system default */ 668 sp = KEY_ALLOCSP_DEFAULT(); 669 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 670 return sp; 671 } 672 673 struct secpolicy * 674 ipsec4_checkpolicy(m, dir, flag, error, inp) 675 struct mbuf *m; 676 u_int dir, flag; 677 int *error; 678 struct inpcb *inp; 679 { 680 struct secpolicy *sp; 681 682 *error = 0; 683 684 685 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 686 if (inp == NULL || inp->inp_socket == NULL) { 687 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 688 } else 689 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); 690 if (sp == NULL) { 691 IPSEC_ASSERT(*error != 0, 692 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 693 newipsecstat.ips_out_inval++; 694 return NULL; 695 } 696 IPSEC_ASSERT(*error == 0, 697 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 698 switch (sp->policy) { 699 case IPSEC_POLICY_ENTRUST: 700 default: 701 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 702 /* fall thru... */ 703 case IPSEC_POLICY_DISCARD: 704 newipsecstat.ips_out_polvio++; 705 *error = -EINVAL; /* packet is discarded by caller */ 706 break; 707 case IPSEC_POLICY_BYPASS: 708 case IPSEC_POLICY_NONE: 709 KEY_FREESP(&sp); 710 sp = NULL; /* NB: force NULL result */ 711 break; 712 case IPSEC_POLICY_IPSEC: 713 if (sp->req == NULL) /* acquire an SA */ 714 *error = key_spdacquire(sp); 715 break; 716 } 717 if (*error != 0) { 718 KEY_FREESP(&sp); 719 sp = NULL; 720 } 721 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 722 return sp; 723 } 724 725 static int 726 ipsec4_setspidx_inpcb(m, pcb) 727 struct mbuf *m; 728 struct inpcb *pcb; 729 { 730 int error; 731 732 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 733 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 734 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 735 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 736 737 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 738 if (error == 0) { 739 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 740 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 741 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 742 } else { 743 bzero(&pcb->inp_sp->sp_in->spidx, 744 sizeof (pcb->inp_sp->sp_in->spidx)); 745 bzero(&pcb->inp_sp->sp_out->spidx, 746 sizeof (pcb->inp_sp->sp_in->spidx)); 747 } 748 return error; 749 } 750 751 #ifdef INET6 752 static int 753 ipsec6_setspidx_in6pcb(m, pcb) 754 struct mbuf *m; 755 struct in6pcb *pcb; 756 { 757 struct secpolicyindex *spidx; 758 int error; 759 760 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 761 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 762 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 763 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 764 765 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 766 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 767 768 spidx = &pcb->in6p_sp->sp_in->spidx; 769 error = ipsec_setspidx(m, spidx, 1); 770 if (error) 771 goto bad; 772 spidx->dir = IPSEC_DIR_INBOUND; 773 774 spidx = &pcb->in6p_sp->sp_out->spidx; 775 error = ipsec_setspidx(m, spidx, 1); 776 if (error) 777 goto bad; 778 spidx->dir = IPSEC_DIR_OUTBOUND; 779 780 return 0; 781 782 bad: 783 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 784 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 785 return error; 786 } 787 #endif 788 789 /* 790 * configure security policy index (src/dst/proto/sport/dport) 791 * by looking at the content of mbuf. 792 * the caller is responsible for error recovery (like clearing up spidx). 793 */ 794 static int 795 ipsec_setspidx(m, spidx, needport) 796 struct mbuf *m; 797 struct secpolicyindex *spidx; 798 int needport; 799 { 800 struct ip *ip = NULL; 801 struct ip ipbuf; 802 u_int v; 803 struct mbuf *n; 804 int len; 805 int error; 806 807 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 808 809 /* 810 * validate m->m_pkthdr.len. we see incorrect length if we 811 * mistakenly call this function with inconsistent mbuf chain 812 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 813 */ 814 len = 0; 815 for (n = m; n; n = n->m_next) 816 len += n->m_len; 817 if (m->m_pkthdr.len != len) { 818 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 819 printf("ipsec_setspidx: " 820 "total of m_len(%d) != pkthdr.len(%d), " 821 "ignored.\n", 822 len, m->m_pkthdr.len)); 823 return EINVAL; 824 } 825 826 if (m->m_pkthdr.len < sizeof(struct ip)) { 827 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 828 printf("ipsec_setspidx: " 829 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 830 m->m_pkthdr.len)); 831 return EINVAL; 832 } 833 834 if (m->m_len >= sizeof(*ip)) 835 ip = mtod(m, struct ip *); 836 else { 837 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 838 ip = &ipbuf; 839 } 840 #ifdef _IP_VHL 841 v = _IP_VHL_V(ip->ip_vhl); 842 #else 843 v = ip->ip_v; 844 #endif 845 switch (v) { 846 case 4: 847 error = ipsec4_setspidx_ipaddr(m, spidx); 848 if (error) 849 return error; 850 ipsec4_get_ulp(m, spidx, needport); 851 return 0; 852 #ifdef INET6 853 case 6: 854 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 855 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 856 printf("ipsec_setspidx: " 857 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 858 "ignored.\n", m->m_pkthdr.len)); 859 return EINVAL; 860 } 861 error = ipsec6_setspidx_ipaddr(m, spidx); 862 if (error) 863 return error; 864 ipsec6_get_ulp(m, spidx, needport); 865 return 0; 866 #endif 867 default: 868 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 869 printf("ipsec_setspidx: " 870 "unknown IP version %u, ignored.\n", v)); 871 return EINVAL; 872 } 873 } 874 875 static void 876 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 877 { 878 u_int8_t nxt; 879 int off; 880 881 /* sanity check */ 882 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 883 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), 884 ("ipsec4_get_ulp: packet too short")); 885 886 /* NB: ip_input() flips it into host endian XXX need more checking */ 887 if (m->m_len >= sizeof(struct ip)) { 888 struct ip *ip = mtod(m, struct ip *); 889 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 890 goto done; 891 #ifdef _IP_VHL 892 off = _IP_VHL_HL(ip->ip_vhl) << 2; 893 #else 894 off = ip->ip_hl << 2; 895 #endif 896 nxt = ip->ip_p; 897 } else { 898 struct ip ih; 899 900 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 901 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 902 goto done; 903 #ifdef _IP_VHL 904 off = _IP_VHL_HL(ih.ip_vhl) << 2; 905 #else 906 off = ih.ip_hl << 2; 907 #endif 908 nxt = ih.ip_p; 909 } 910 911 while (off < m->m_pkthdr.len) { 912 struct ip6_ext ip6e; 913 struct tcphdr th; 914 struct udphdr uh; 915 916 switch (nxt) { 917 case IPPROTO_TCP: 918 spidx->ul_proto = nxt; 919 if (!needport) 920 goto done_proto; 921 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 922 goto done; 923 m_copydata(m, off, sizeof (th), (caddr_t) &th); 924 spidx->src.sin.sin_port = th.th_sport; 925 spidx->dst.sin.sin_port = th.th_dport; 926 return; 927 case IPPROTO_UDP: 928 spidx->ul_proto = nxt; 929 if (!needport) 930 goto done_proto; 931 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 932 goto done; 933 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 934 spidx->src.sin.sin_port = uh.uh_sport; 935 spidx->dst.sin.sin_port = uh.uh_dport; 936 return; 937 case IPPROTO_AH: 938 if (m->m_pkthdr.len > off + sizeof(ip6e)) 939 goto done; 940 /* XXX sigh, this works but is totally bogus */ 941 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 942 off += (ip6e.ip6e_len + 2) << 2; 943 nxt = ip6e.ip6e_nxt; 944 break; 945 case IPPROTO_ICMP: 946 default: 947 /* XXX intermediate headers??? */ 948 spidx->ul_proto = nxt; 949 goto done_proto; 950 } 951 } 952 done: 953 spidx->ul_proto = IPSEC_ULPROTO_ANY; 954 done_proto: 955 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 956 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 957 } 958 959 /* assumes that m is sane */ 960 static int 961 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 962 { 963 static const struct sockaddr_in template = { 964 sizeof (struct sockaddr_in), 965 AF_INET, 966 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 967 }; 968 969 spidx->src.sin = template; 970 spidx->dst.sin = template; 971 972 if (m->m_len < sizeof (struct ip)) { 973 m_copydata(m, offsetof(struct ip, ip_src), 974 sizeof (struct in_addr), 975 (caddr_t) &spidx->src.sin.sin_addr); 976 m_copydata(m, offsetof(struct ip, ip_dst), 977 sizeof (struct in_addr), 978 (caddr_t) &spidx->dst.sin.sin_addr); 979 } else { 980 struct ip *ip = mtod(m, struct ip *); 981 spidx->src.sin.sin_addr = ip->ip_src; 982 spidx->dst.sin.sin_addr = ip->ip_dst; 983 } 984 985 spidx->prefs = sizeof(struct in_addr) << 3; 986 spidx->prefd = sizeof(struct in_addr) << 3; 987 988 return 0; 989 } 990 991 #ifdef INET6 992 static void 993 ipsec6_get_ulp(m, spidx, needport) 994 struct mbuf *m; 995 struct secpolicyindex *spidx; 996 int needport; 997 { 998 int off, nxt; 999 struct tcphdr th; 1000 struct udphdr uh; 1001 1002 /* sanity check */ 1003 if (m == NULL) 1004 panic("ipsec6_get_ulp: NULL pointer was passed"); 1005 1006 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1007 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 1008 1009 /* set default */ 1010 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1011 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1012 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1013 1014 nxt = -1; 1015 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1016 if (off < 0 || m->m_pkthdr.len < off) 1017 return; 1018 1019 switch (nxt) { 1020 case IPPROTO_TCP: 1021 spidx->ul_proto = nxt; 1022 if (!needport) 1023 break; 1024 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1025 break; 1026 m_copydata(m, off, sizeof(th), (caddr_t)&th); 1027 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1028 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1029 break; 1030 case IPPROTO_UDP: 1031 spidx->ul_proto = nxt; 1032 if (!needport) 1033 break; 1034 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1035 break; 1036 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 1037 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1038 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1039 break; 1040 case IPPROTO_ICMPV6: 1041 default: 1042 /* XXX intermediate headers??? */ 1043 spidx->ul_proto = nxt; 1044 break; 1045 } 1046 } 1047 1048 /* assumes that m is sane */ 1049 static int 1050 ipsec6_setspidx_ipaddr(m, spidx) 1051 struct mbuf *m; 1052 struct secpolicyindex *spidx; 1053 { 1054 struct ip6_hdr *ip6 = NULL; 1055 struct ip6_hdr ip6buf; 1056 struct sockaddr_in6 *sin6; 1057 1058 if (m->m_len >= sizeof(*ip6)) 1059 ip6 = mtod(m, struct ip6_hdr *); 1060 else { 1061 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 1062 ip6 = &ip6buf; 1063 } 1064 1065 sin6 = (struct sockaddr_in6 *)&spidx->src; 1066 bzero(sin6, sizeof(*sin6)); 1067 sin6->sin6_family = AF_INET6; 1068 sin6->sin6_len = sizeof(struct sockaddr_in6); 1069 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 1070 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1071 sin6->sin6_addr.s6_addr16[1] = 0; 1072 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1073 } 1074 spidx->prefs = sizeof(struct in6_addr) << 3; 1075 1076 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1077 bzero(sin6, sizeof(*sin6)); 1078 sin6->sin6_family = AF_INET6; 1079 sin6->sin6_len = sizeof(struct sockaddr_in6); 1080 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 1081 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1082 sin6->sin6_addr.s6_addr16[1] = 0; 1083 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1084 } 1085 spidx->prefd = sizeof(struct in6_addr) << 3; 1086 1087 return 0; 1088 } 1089 #endif 1090 1091 static void 1092 ipsec_delpcbpolicy(p) 1093 struct inpcbpolicy *p; 1094 { 1095 free(p, M_SECA); 1096 } 1097 1098 /* initialize policy in PCB */ 1099 int 1100 ipsec_init_policy(so, pcb_sp) 1101 struct socket *so; 1102 struct inpcbpolicy **pcb_sp; 1103 { 1104 struct inpcbpolicy *new; 1105 1106 /* sanity check. */ 1107 if (so == NULL || pcb_sp == NULL) 1108 panic("ipsec_init_policy: NULL pointer was passed"); 1109 1110 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 1111 M_SECA, M_NOWAIT|M_ZERO); 1112 if (new == NULL) { 1113 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 1114 return ENOBUFS; 1115 } 1116 1117 if (IPSEC_PRIVILEGED_SO(so)) 1118 new->priv = 1; 1119 else 1120 new->priv = 0; 1121 1122 if ((new->sp_in = KEY_NEWSP()) == NULL) { 1123 ipsec_delpcbpolicy(new); 1124 return ENOBUFS; 1125 } 1126 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 1127 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 1128 1129 if ((new->sp_out = KEY_NEWSP()) == NULL) { 1130 KEY_FREESP(&new->sp_in); 1131 ipsec_delpcbpolicy(new); 1132 return ENOBUFS; 1133 } 1134 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 1135 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 1136 1137 *pcb_sp = new; 1138 1139 return 0; 1140 } 1141 1142 /* copy old ipsec policy into new */ 1143 int 1144 ipsec_copy_policy(old, new) 1145 struct inpcbpolicy *old, *new; 1146 { 1147 struct secpolicy *sp; 1148 1149 sp = ipsec_deepcopy_policy(old->sp_in); 1150 if (sp) { 1151 KEY_FREESP(&new->sp_in); 1152 new->sp_in = sp; 1153 } else 1154 return ENOBUFS; 1155 1156 sp = ipsec_deepcopy_policy(old->sp_out); 1157 if (sp) { 1158 KEY_FREESP(&new->sp_out); 1159 new->sp_out = sp; 1160 } else 1161 return ENOBUFS; 1162 1163 new->priv = old->priv; 1164 1165 return 0; 1166 } 1167 1168 /* deep-copy a policy in PCB */ 1169 static struct secpolicy * 1170 ipsec_deepcopy_policy(src) 1171 struct secpolicy *src; 1172 { 1173 struct ipsecrequest *newchain = NULL; 1174 struct ipsecrequest *p; 1175 struct ipsecrequest **q; 1176 struct ipsecrequest *r; 1177 struct secpolicy *dst; 1178 1179 if (src == NULL) 1180 return NULL; 1181 dst = KEY_NEWSP(); 1182 if (dst == NULL) 1183 return NULL; 1184 1185 /* 1186 * deep-copy IPsec request chain. This is required since struct 1187 * ipsecrequest is not reference counted. 1188 */ 1189 q = &newchain; 1190 for (p = src->req; p; p = p->next) { 1191 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest), 1192 M_SECA, M_NOWAIT); 1193 if (*q == NULL) 1194 goto fail; 1195 bzero(*q, sizeof(**q)); 1196 (*q)->next = NULL; 1197 1198 (*q)->saidx.proto = p->saidx.proto; 1199 (*q)->saidx.mode = p->saidx.mode; 1200 (*q)->level = p->level; 1201 (*q)->saidx.reqid = p->saidx.reqid; 1202 1203 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1204 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1205 1206 (*q)->sav = NULL; 1207 (*q)->sp = dst; 1208 1209 q = &((*q)->next); 1210 } 1211 1212 dst->req = newchain; 1213 dst->state = src->state; 1214 dst->policy = src->policy; 1215 /* do not touch the refcnt fields */ 1216 1217 return dst; 1218 1219 fail: 1220 for (p = newchain; p; p = r) { 1221 r = p->next; 1222 free(p, M_SECA); 1223 p = NULL; 1224 } 1225 return NULL; 1226 } 1227 1228 /* set policy and ipsec request if present. */ 1229 static int 1230 ipsec_set_policy(pcb_sp, optname, request, len, priv) 1231 struct secpolicy **pcb_sp; 1232 int optname; 1233 caddr_t request; 1234 size_t len; 1235 int priv; 1236 { 1237 struct sadb_x_policy *xpl; 1238 struct secpolicy *newsp = NULL; 1239 int error; 1240 1241 /* sanity check. */ 1242 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1243 return EINVAL; 1244 if (len < sizeof(*xpl)) 1245 return EINVAL; 1246 xpl = (struct sadb_x_policy *)request; 1247 1248 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1249 printf("ipsec_set_policy: passed policy\n"); 1250 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1251 1252 /* check policy type */ 1253 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1254 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1255 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1256 return EINVAL; 1257 1258 /* check privileged socket */ 1259 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1260 return EACCES; 1261 1262 /* allocation new SP entry */ 1263 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1264 return error; 1265 1266 newsp->state = IPSEC_SPSTATE_ALIVE; 1267 1268 /* clear old SP and set new SP */ 1269 KEY_FREESP(pcb_sp); 1270 *pcb_sp = newsp; 1271 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1272 printf("ipsec_set_policy: new policy\n"); 1273 kdebug_secpolicy(newsp)); 1274 1275 return 0; 1276 } 1277 1278 static int 1279 ipsec_get_policy(pcb_sp, mp) 1280 struct secpolicy *pcb_sp; 1281 struct mbuf **mp; 1282 { 1283 1284 /* sanity check. */ 1285 if (pcb_sp == NULL || mp == NULL) 1286 return EINVAL; 1287 1288 *mp = key_sp2msg(pcb_sp); 1289 if (!*mp) { 1290 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1291 return ENOBUFS; 1292 } 1293 1294 (*mp)->m_type = MT_DATA; 1295 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1296 printf("ipsec_get_policy:\n"); 1297 kdebug_mbuf(*mp)); 1298 1299 return 0; 1300 } 1301 1302 int 1303 ipsec4_set_policy(inp, optname, request, len, priv) 1304 struct inpcb *inp; 1305 int optname; 1306 caddr_t request; 1307 size_t len; 1308 int priv; 1309 { 1310 struct sadb_x_policy *xpl; 1311 struct secpolicy **pcb_sp; 1312 1313 /* sanity check. */ 1314 if (inp == NULL || request == NULL) 1315 return EINVAL; 1316 if (len < sizeof(*xpl)) 1317 return EINVAL; 1318 xpl = (struct sadb_x_policy *)request; 1319 1320 IPSEC_ASSERT(inp->inp_sp != NULL, 1321 ("ipsec4_set_policy(): null inp->in_sp")); 1322 1323 /* select direction */ 1324 switch (xpl->sadb_x_policy_dir) { 1325 case IPSEC_DIR_INBOUND: 1326 pcb_sp = &inp->inp_sp->sp_in; 1327 break; 1328 case IPSEC_DIR_OUTBOUND: 1329 pcb_sp = &inp->inp_sp->sp_out; 1330 break; 1331 default: 1332 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1333 xpl->sadb_x_policy_dir)); 1334 return EINVAL; 1335 } 1336 1337 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1338 } 1339 1340 int 1341 ipsec4_get_policy(inp, request, len, mp) 1342 struct inpcb *inp; 1343 caddr_t request; 1344 size_t len; 1345 struct mbuf **mp; 1346 { 1347 struct sadb_x_policy *xpl; 1348 struct secpolicy *pcb_sp; 1349 1350 /* sanity check. */ 1351 if (inp == NULL || request == NULL || mp == NULL) 1352 return EINVAL; 1353 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1354 if (len < sizeof(*xpl)) 1355 return EINVAL; 1356 xpl = (struct sadb_x_policy *)request; 1357 1358 /* select direction */ 1359 switch (xpl->sadb_x_policy_dir) { 1360 case IPSEC_DIR_INBOUND: 1361 pcb_sp = inp->inp_sp->sp_in; 1362 break; 1363 case IPSEC_DIR_OUTBOUND: 1364 pcb_sp = inp->inp_sp->sp_out; 1365 break; 1366 default: 1367 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1368 xpl->sadb_x_policy_dir)); 1369 return EINVAL; 1370 } 1371 1372 return ipsec_get_policy(pcb_sp, mp); 1373 } 1374 1375 /* delete policy in PCB */ 1376 int 1377 ipsec4_delete_pcbpolicy(inp) 1378 struct inpcb *inp; 1379 { 1380 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1381 1382 if (inp->inp_sp == NULL) 1383 return 0; 1384 1385 if (inp->inp_sp->sp_in != NULL) 1386 KEY_FREESP(&inp->inp_sp->sp_in); 1387 1388 if (inp->inp_sp->sp_out != NULL) 1389 KEY_FREESP(&inp->inp_sp->sp_out); 1390 1391 ipsec_delpcbpolicy(inp->inp_sp); 1392 inp->inp_sp = NULL; 1393 1394 return 0; 1395 } 1396 1397 #ifdef INET6 1398 int 1399 ipsec6_set_policy(in6p, optname, request, len, priv) 1400 struct in6pcb *in6p; 1401 int optname; 1402 caddr_t request; 1403 size_t len; 1404 int priv; 1405 { 1406 struct sadb_x_policy *xpl; 1407 struct secpolicy **pcb_sp; 1408 1409 /* sanity check. */ 1410 if (in6p == NULL || request == NULL) 1411 return EINVAL; 1412 if (len < sizeof(*xpl)) 1413 return EINVAL; 1414 xpl = (struct sadb_x_policy *)request; 1415 1416 /* select direction */ 1417 switch (xpl->sadb_x_policy_dir) { 1418 case IPSEC_DIR_INBOUND: 1419 pcb_sp = &in6p->in6p_sp->sp_in; 1420 break; 1421 case IPSEC_DIR_OUTBOUND: 1422 pcb_sp = &in6p->in6p_sp->sp_out; 1423 break; 1424 default: 1425 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1426 xpl->sadb_x_policy_dir)); 1427 return EINVAL; 1428 } 1429 1430 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1431 } 1432 1433 int 1434 ipsec6_get_policy(in6p, request, len, mp) 1435 struct in6pcb *in6p; 1436 caddr_t request; 1437 size_t len; 1438 struct mbuf **mp; 1439 { 1440 struct sadb_x_policy *xpl; 1441 struct secpolicy *pcb_sp; 1442 1443 /* sanity check. */ 1444 if (in6p == NULL || request == NULL || mp == NULL) 1445 return EINVAL; 1446 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1447 if (len < sizeof(*xpl)) 1448 return EINVAL; 1449 xpl = (struct sadb_x_policy *)request; 1450 1451 /* select direction */ 1452 switch (xpl->sadb_x_policy_dir) { 1453 case IPSEC_DIR_INBOUND: 1454 pcb_sp = in6p->in6p_sp->sp_in; 1455 break; 1456 case IPSEC_DIR_OUTBOUND: 1457 pcb_sp = in6p->in6p_sp->sp_out; 1458 break; 1459 default: 1460 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1461 xpl->sadb_x_policy_dir)); 1462 return EINVAL; 1463 } 1464 1465 return ipsec_get_policy(pcb_sp, mp); 1466 } 1467 1468 int 1469 ipsec6_delete_pcbpolicy(in6p) 1470 struct in6pcb *in6p; 1471 { 1472 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1473 1474 if (in6p->in6p_sp == NULL) 1475 return 0; 1476 1477 if (in6p->in6p_sp->sp_in != NULL) 1478 KEY_FREESP(&in6p->in6p_sp->sp_in); 1479 1480 if (in6p->in6p_sp->sp_out != NULL) 1481 KEY_FREESP(&in6p->in6p_sp->sp_out); 1482 1483 ipsec_delpcbpolicy(in6p->in6p_sp); 1484 in6p->in6p_sp = NULL; 1485 1486 return 0; 1487 } 1488 #endif 1489 1490 /* 1491 * return current level. 1492 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1493 */ 1494 u_int 1495 ipsec_get_reqlevel(isr) 1496 struct ipsecrequest *isr; 1497 { 1498 u_int level = 0; 1499 u_int esp_trans_deflev, esp_net_deflev; 1500 u_int ah_trans_deflev, ah_net_deflev; 1501 1502 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1503 ("ipsec_get_reqlevel: null argument")); 1504 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1505 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1506 isr->sp->spidx.src.sa.sa_family, 1507 isr->sp->spidx.dst.sa.sa_family)); 1508 1509 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1510 #define IPSEC_CHECK_DEFAULT(lev) \ 1511 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1512 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1513 ? (ipsec_debug \ 1514 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1515 (lev), IPSEC_LEVEL_REQUIRE) \ 1516 : 0), \ 1517 (lev) = IPSEC_LEVEL_REQUIRE, \ 1518 (lev) \ 1519 : (lev)) 1520 1521 /* set default level */ 1522 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1523 #ifdef INET 1524 case AF_INET: 1525 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1526 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1527 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1528 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1529 break; 1530 #endif 1531 #ifdef INET6 1532 case AF_INET6: 1533 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1534 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1535 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1536 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1537 break; 1538 #endif /* INET6 */ 1539 default: 1540 panic("key_get_reqlevel: unknown af %u", 1541 isr->sp->spidx.src.sa.sa_family); 1542 } 1543 1544 #undef IPSEC_CHECK_DEFAULT 1545 1546 /* set level */ 1547 switch (isr->level) { 1548 case IPSEC_LEVEL_DEFAULT: 1549 switch (isr->saidx.proto) { 1550 case IPPROTO_ESP: 1551 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1552 level = esp_net_deflev; 1553 else 1554 level = esp_trans_deflev; 1555 break; 1556 case IPPROTO_AH: 1557 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1558 level = ah_net_deflev; 1559 else 1560 level = ah_trans_deflev; 1561 break; 1562 case IPPROTO_IPCOMP: 1563 /* 1564 * we don't really care, as IPcomp document says that 1565 * we shouldn't compress small packets 1566 */ 1567 level = IPSEC_LEVEL_USE; 1568 break; 1569 default: 1570 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1571 isr->saidx.proto); 1572 } 1573 break; 1574 1575 case IPSEC_LEVEL_USE: 1576 case IPSEC_LEVEL_REQUIRE: 1577 level = isr->level; 1578 break; 1579 case IPSEC_LEVEL_UNIQUE: 1580 level = IPSEC_LEVEL_REQUIRE; 1581 break; 1582 1583 default: 1584 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1585 isr->level); 1586 } 1587 1588 return level; 1589 } 1590 1591 /* 1592 * Check security policy requirements against the actual 1593 * packet contents. Return one if the packet should be 1594 * reject as "invalid"; otherwiser return zero to have the 1595 * packet treated as "valid". 1596 * 1597 * OUT: 1598 * 0: valid 1599 * 1: invalid 1600 */ 1601 int 1602 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1603 { 1604 struct ipsecrequest *isr; 1605 int need_auth; 1606 1607 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1608 printf("ipsec_in_reject: using SP\n"); 1609 kdebug_secpolicy(sp)); 1610 1611 /* check policy */ 1612 switch (sp->policy) { 1613 case IPSEC_POLICY_DISCARD: 1614 return 1; 1615 case IPSEC_POLICY_BYPASS: 1616 case IPSEC_POLICY_NONE: 1617 return 0; 1618 } 1619 1620 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1621 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1622 1623 /* XXX should compare policy against ipsec header history */ 1624 1625 need_auth = 0; 1626 for (isr = sp->req; isr != NULL; isr = isr->next) { 1627 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1628 continue; 1629 switch (isr->saidx.proto) { 1630 case IPPROTO_ESP: 1631 if ((m->m_flags & M_DECRYPTED) == 0) { 1632 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1633 printf("ipsec_in_reject: ESP m_flags:%x\n", 1634 m->m_flags)); 1635 return 1; 1636 } 1637 1638 if (!need_auth && 1639 isr->sav != NULL && 1640 isr->sav->tdb_authalgxform != NULL && 1641 (m->m_flags & M_AUTHIPDGM) == 0) { 1642 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1643 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1644 m->m_flags)); 1645 return 1; 1646 } 1647 break; 1648 case IPPROTO_AH: 1649 need_auth = 1; 1650 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1651 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1652 printf("ipsec_in_reject: AH m_flags:%x\n", 1653 m->m_flags)); 1654 return 1; 1655 } 1656 break; 1657 case IPPROTO_IPCOMP: 1658 /* 1659 * we don't really care, as IPcomp document 1660 * says that we shouldn't compress small 1661 * packets, IPComp policy should always be 1662 * treated as being in "use" level. 1663 */ 1664 break; 1665 } 1666 } 1667 return 0; /* valid */ 1668 } 1669 1670 /* 1671 * Check AH/ESP integrity. 1672 * This function is called from tcp_input(), udp_input(), 1673 * and {ah,esp}4_input for tunnel mode 1674 */ 1675 int 1676 ipsec4_in_reject(m, inp) 1677 struct mbuf *m; 1678 struct inpcb *inp; 1679 { 1680 struct secpolicy *sp; 1681 int error; 1682 int result; 1683 1684 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1685 1686 /* get SP for this packet. 1687 * When we are called from ip_forward(), we call 1688 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1689 */ 1690 if (inp == NULL) 1691 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1692 else 1693 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1694 IN4PCB_TO_PCB(inp), &error); 1695 1696 if (sp != NULL) { 1697 result = ipsec_in_reject(sp, m); 1698 if (result) 1699 newipsecstat.ips_in_polvio++; 1700 KEY_FREESP(&sp); 1701 } else { 1702 result = 0; /* XXX should be panic ? 1703 * -> No, there may be error. */ 1704 } 1705 return result; 1706 } 1707 1708 1709 #ifdef INET6 1710 /* 1711 * Check AH/ESP integrity. 1712 * This function is called from tcp6_input(), udp6_input(), 1713 * and {ah,esp}6_input for tunnel mode 1714 */ 1715 int 1716 ipsec6_in_reject(m, in6p) 1717 struct mbuf *m; 1718 struct in6pcb *in6p; 1719 { 1720 struct secpolicy *sp = NULL; 1721 int error; 1722 int result; 1723 1724 /* sanity check */ 1725 if (m == NULL) 1726 return 0; /* XXX should be panic ? */ 1727 1728 /* get SP for this packet. 1729 * When we are called from ip_forward(), we call 1730 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1731 */ 1732 if (in6p == NULL) 1733 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1734 else 1735 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1736 IN6PCB_TO_PCB(in6p), 1737 &error); 1738 1739 if (sp != NULL) { 1740 result = ipsec_in_reject(sp, m); 1741 if (result) 1742 newipsecstat.ips_in_polvio++; 1743 KEY_FREESP(&sp); 1744 } else { 1745 result = 0; 1746 } 1747 return result; 1748 } 1749 #endif 1750 1751 /* 1752 * compute the byte size to be occupied by IPsec header. 1753 * in case it is tunneled, it includes the size of outer IP header. 1754 * NOTE: SP passed is free in this function. 1755 */ 1756 static size_t 1757 ipsec_hdrsiz(struct secpolicy *sp) 1758 { 1759 struct ipsecrequest *isr; 1760 size_t siz; 1761 1762 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1763 printf("ipsec_hdrsiz: using SP\n"); 1764 kdebug_secpolicy(sp)); 1765 1766 switch (sp->policy) { 1767 case IPSEC_POLICY_DISCARD: 1768 case IPSEC_POLICY_BYPASS: 1769 case IPSEC_POLICY_NONE: 1770 return 0; 1771 } 1772 1773 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1774 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1775 1776 siz = 0; 1777 for (isr = sp->req; isr != NULL; isr = isr->next) { 1778 size_t clen = 0; 1779 1780 switch (isr->saidx.proto) { 1781 case IPPROTO_ESP: 1782 clen = esp_hdrsiz(isr->sav); 1783 break; 1784 case IPPROTO_AH: 1785 clen = ah_hdrsiz(isr->sav); 1786 break; 1787 case IPPROTO_IPCOMP: 1788 clen = sizeof(struct ipcomp); 1789 break; 1790 } 1791 1792 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1793 switch (isr->saidx.dst.sa.sa_family) { 1794 case AF_INET: 1795 clen += sizeof(struct ip); 1796 break; 1797 #ifdef INET6 1798 case AF_INET6: 1799 clen += sizeof(struct ip6_hdr); 1800 break; 1801 #endif 1802 default: 1803 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1804 "unknown AF %d in IPsec tunnel SA\n", 1805 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1806 break; 1807 } 1808 } 1809 siz += clen; 1810 } 1811 1812 return siz; 1813 } 1814 1815 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1816 size_t 1817 ipsec4_hdrsiz(m, dir, inp) 1818 struct mbuf *m; 1819 u_int dir; 1820 struct inpcb *inp; 1821 { 1822 struct secpolicy *sp; 1823 int error; 1824 size_t size; 1825 1826 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1827 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1828 ("ipsec4_hdrsize: socket w/o inpcb")); 1829 1830 /* get SP for this packet. 1831 * When we are called from ip_forward(), we call 1832 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1833 */ 1834 if (inp == NULL) 1835 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1836 else 1837 sp = ipsec_getpolicybysock(m, dir, 1838 IN4PCB_TO_PCB(inp), &error); 1839 1840 if (sp != NULL) { 1841 size = ipsec_hdrsiz(sp); 1842 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1843 printf("ipsec4_hdrsiz: size:%lu.\n", 1844 (unsigned long)size)); 1845 1846 KEY_FREESP(&sp); 1847 } else { 1848 size = 0; /* XXX should be panic ? */ 1849 } 1850 return size; 1851 } 1852 1853 #ifdef INET6 1854 /* This function is called from ipsec6_hdrsize_tcp(), 1855 * and maybe from ip6_forward.() 1856 */ 1857 size_t 1858 ipsec6_hdrsiz(m, dir, in6p) 1859 struct mbuf *m; 1860 u_int dir; 1861 struct in6pcb *in6p; 1862 { 1863 struct secpolicy *sp; 1864 int error; 1865 size_t size; 1866 1867 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1868 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1869 ("ipsec6_hdrsize: socket w/o inpcb")); 1870 1871 /* get SP for this packet */ 1872 /* XXX Is it right to call with IP_FORWARDING. */ 1873 if (in6p == NULL) 1874 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1875 else 1876 sp = ipsec_getpolicybysock(m, dir, 1877 IN6PCB_TO_PCB(in6p), 1878 &error); 1879 1880 if (sp == NULL) 1881 return 0; 1882 size = ipsec_hdrsiz(sp); 1883 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1884 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1885 KEY_FREESP(&sp); 1886 1887 return size; 1888 } 1889 #endif /*INET6*/ 1890 1891 /* 1892 * Check the variable replay window. 1893 * ipsec_chkreplay() performs replay check before ICV verification. 1894 * ipsec_updatereplay() updates replay bitmap. This must be called after 1895 * ICV verification (it also performs replay check, which is usually done 1896 * beforehand). 1897 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1898 * 1899 * based on RFC 2401. 1900 */ 1901 int 1902 ipsec_chkreplay(seq, sav) 1903 u_int32_t seq; 1904 struct secasvar *sav; 1905 { 1906 const struct secreplay *replay; 1907 u_int32_t diff; 1908 int fr; 1909 u_int32_t wsizeb; /* constant: bits of window size */ 1910 int frlast; /* constant: last frame */ 1911 1912 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 1913 1914 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1915 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1916 1917 replay = sav->replay; 1918 1919 if (replay->wsize == 0) 1920 return 1; /* no need to check replay. */ 1921 1922 /* constant */ 1923 frlast = replay->wsize - 1; 1924 wsizeb = replay->wsize << 3; 1925 1926 /* sequence number of 0 is invalid */ 1927 if (seq == 0) 1928 return 0; 1929 1930 /* first time is always okay */ 1931 if (replay->count == 0) 1932 return 1; 1933 1934 if (seq > replay->lastseq) { 1935 /* larger sequences are okay */ 1936 return 1; 1937 } else { 1938 /* seq is equal or less than lastseq. */ 1939 diff = replay->lastseq - seq; 1940 1941 /* over range to check, i.e. too old or wrapped */ 1942 if (diff >= wsizeb) 1943 return 0; 1944 1945 fr = frlast - diff / 8; 1946 1947 /* this packet already seen ? */ 1948 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1949 return 0; 1950 1951 /* out of order but good */ 1952 return 1; 1953 } 1954 } 1955 1956 /* 1957 * check replay counter whether to update or not. 1958 * OUT: 0: OK 1959 * 1: NG 1960 */ 1961 int 1962 ipsec_updatereplay(seq, sav) 1963 u_int32_t seq; 1964 struct secasvar *sav; 1965 { 1966 struct secreplay *replay; 1967 u_int32_t diff; 1968 int fr; 1969 u_int32_t wsizeb; /* constant: bits of window size */ 1970 int frlast; /* constant: last frame */ 1971 1972 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 1973 1974 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 1975 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 1976 1977 replay = sav->replay; 1978 1979 if (replay->wsize == 0) 1980 goto ok; /* no need to check replay. */ 1981 1982 /* constant */ 1983 frlast = replay->wsize - 1; 1984 wsizeb = replay->wsize << 3; 1985 1986 /* sequence number of 0 is invalid */ 1987 if (seq == 0) 1988 return 1; 1989 1990 /* first time */ 1991 if (replay->count == 0) { 1992 replay->lastseq = seq; 1993 bzero(replay->bitmap, replay->wsize); 1994 (replay->bitmap)[frlast] = 1; 1995 goto ok; 1996 } 1997 1998 if (seq > replay->lastseq) { 1999 /* seq is larger than lastseq. */ 2000 diff = seq - replay->lastseq; 2001 2002 /* new larger sequence number */ 2003 if (diff < wsizeb) { 2004 /* In window */ 2005 /* set bit for this packet */ 2006 vshiftl(replay->bitmap, diff, replay->wsize); 2007 (replay->bitmap)[frlast] |= 1; 2008 } else { 2009 /* this packet has a "way larger" */ 2010 bzero(replay->bitmap, replay->wsize); 2011 (replay->bitmap)[frlast] = 1; 2012 } 2013 replay->lastseq = seq; 2014 2015 /* larger is good */ 2016 } else { 2017 /* seq is equal or less than lastseq. */ 2018 diff = replay->lastseq - seq; 2019 2020 /* over range to check, i.e. too old or wrapped */ 2021 if (diff >= wsizeb) 2022 return 1; 2023 2024 fr = frlast - diff / 8; 2025 2026 /* this packet already seen ? */ 2027 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2028 return 1; 2029 2030 /* mark as seen */ 2031 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2032 2033 /* out of order but good */ 2034 } 2035 2036 ok: 2037 if (replay->count == ~0) { 2038 2039 /* set overflow flag */ 2040 replay->overflow++; 2041 2042 /* don't increment, no more packets accepted */ 2043 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2044 return 1; 2045 2046 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2047 replay->overflow, ipsec_logsastr(sav))); 2048 } 2049 2050 replay->count++; 2051 2052 return 0; 2053 } 2054 2055 /* 2056 * shift variable length bunffer to left. 2057 * IN: bitmap: pointer to the buffer 2058 * nbit: the number of to shift. 2059 * wsize: buffer size (bytes). 2060 */ 2061 static void 2062 vshiftl(bitmap, nbit, wsize) 2063 unsigned char *bitmap; 2064 int nbit, wsize; 2065 { 2066 int s, j, i; 2067 unsigned char over; 2068 2069 for (j = 0; j < nbit; j += 8) { 2070 s = (nbit - j < 8) ? (nbit - j): 8; 2071 bitmap[0] <<= s; 2072 for (i = 1; i < wsize; i++) { 2073 over = (bitmap[i] >> (8 - s)); 2074 bitmap[i] <<= s; 2075 bitmap[i-1] |= over; 2076 } 2077 } 2078 2079 return; 2080 } 2081 2082 /* Return a printable string for the IPv4 address. */ 2083 static char * 2084 inet_ntoa4(struct in_addr ina) 2085 { 2086 static char buf[4][4 * sizeof "123" + 4]; 2087 unsigned char *ucp = (unsigned char *) &ina; 2088 static int i = 3; 2089 2090 i = (i + 1) % 4; 2091 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2092 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2093 return (buf[i]); 2094 } 2095 2096 /* Return a printable string for the address. */ 2097 const char * 2098 ipsec_address(union sockaddr_union* sa) 2099 { 2100 switch (sa->sa.sa_family) { 2101 #if INET 2102 case AF_INET: 2103 return inet_ntoa4(sa->sin.sin_addr); 2104 #endif /* INET */ 2105 2106 #if INET6 2107 case AF_INET6: 2108 return ip6_sprintf(&sa->sin6.sin6_addr); 2109 #endif /* INET6 */ 2110 2111 default: 2112 return "(unknown address family)"; 2113 } 2114 } 2115 2116 const char * 2117 ipsec_logsastr(sav) 2118 struct secasvar *sav; 2119 { 2120 static char buf[256]; 2121 char *p; 2122 struct secasindex *saidx = &sav->sah->saidx; 2123 2124 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2125 ("ipsec_logsastr: address family mismatch")); 2126 2127 p = buf; 2128 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2129 while (p && *p) 2130 p++; 2131 /* NB: only use ipsec_address on one address at a time */ 2132 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2133 ipsec_address(&saidx->src)); 2134 while (p && *p) 2135 p++; 2136 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2137 ipsec_address(&saidx->dst)); 2138 2139 return buf; 2140 } 2141 2142 void 2143 ipsec_dumpmbuf(m) 2144 struct mbuf *m; 2145 { 2146 int totlen; 2147 int i; 2148 u_char *p; 2149 2150 totlen = 0; 2151 printf("---\n"); 2152 while (m) { 2153 p = mtod(m, u_char *); 2154 for (i = 0; i < m->m_len; i++) { 2155 printf("%02x ", p[i]); 2156 totlen++; 2157 if (totlen % 16 == 0) 2158 printf("\n"); 2159 } 2160 m = m->m_next; 2161 } 2162 if (totlen % 16 != 0) 2163 printf("\n"); 2164 printf("---\n"); 2165 } 2166 2167 /* XXX this stuff doesn't belong here... */ 2168 2169 static struct xformsw* xforms = NULL; 2170 2171 /* 2172 * Register a transform; typically at system startup. 2173 */ 2174 void 2175 xform_register(struct xformsw* xsp) 2176 { 2177 xsp->xf_next = xforms; 2178 xforms = xsp; 2179 } 2180 2181 /* 2182 * Initialize transform support in an sav. 2183 */ 2184 int 2185 xform_init(struct secasvar *sav, int xftype) 2186 { 2187 struct xformsw *xsp; 2188 2189 if (sav->tdb_xform != NULL) /* previously initialized */ 2190 return 0; 2191 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2192 if (xsp->xf_type == xftype) 2193 return (*xsp->xf_init)(sav, xsp); 2194 2195 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2196 return EINVAL; 2197 } 2198 2199 #ifdef __NetBSD__ 2200 void 2201 ipsec_attach(void) 2202 { 2203 printf("initializing IPsec..."); 2204 ah_attach(); 2205 esp_attach(); 2206 ipcomp_attach(); 2207 ipe4_attach(); 2208 #ifdef TCP_SIGNATURE 2209 tcpsignature_attach(); 2210 #endif 2211 printf(" done\n"); 2212 } 2213 #endif /* __NetBSD__ */ 2214