ipsec.c revision 1.24
1 /* $NetBSD: ipsec.c,v 1.24 2006/10/13 20:53:59 christos 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 1.24 2006/10/13 20:53:59 christos 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( 1231 struct secpolicy **pcb_sp, 1232 int optname __unused, 1233 caddr_t request, 1234 size_t len, 1235 int priv 1236 ) 1237 { 1238 struct sadb_x_policy *xpl; 1239 struct secpolicy *newsp = NULL; 1240 int error; 1241 1242 /* sanity check. */ 1243 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1244 return EINVAL; 1245 if (len < sizeof(*xpl)) 1246 return EINVAL; 1247 xpl = (struct sadb_x_policy *)request; 1248 1249 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1250 printf("ipsec_set_policy: passed policy\n"); 1251 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1252 1253 /* check policy type */ 1254 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1255 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1256 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1257 return EINVAL; 1258 1259 /* check privileged socket */ 1260 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1261 return EACCES; 1262 1263 /* allocation new SP entry */ 1264 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1265 return error; 1266 1267 newsp->state = IPSEC_SPSTATE_ALIVE; 1268 1269 /* clear old SP and set new SP */ 1270 KEY_FREESP(pcb_sp); 1271 *pcb_sp = newsp; 1272 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1273 printf("ipsec_set_policy: new policy\n"); 1274 kdebug_secpolicy(newsp)); 1275 1276 return 0; 1277 } 1278 1279 static int 1280 ipsec_get_policy(pcb_sp, mp) 1281 struct secpolicy *pcb_sp; 1282 struct mbuf **mp; 1283 { 1284 1285 /* sanity check. */ 1286 if (pcb_sp == NULL || mp == NULL) 1287 return EINVAL; 1288 1289 *mp = key_sp2msg(pcb_sp); 1290 if (!*mp) { 1291 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1292 return ENOBUFS; 1293 } 1294 1295 (*mp)->m_type = MT_DATA; 1296 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1297 printf("ipsec_get_policy:\n"); 1298 kdebug_mbuf(*mp)); 1299 1300 return 0; 1301 } 1302 1303 int 1304 ipsec4_set_policy(inp, optname, request, len, priv) 1305 struct inpcb *inp; 1306 int optname; 1307 caddr_t request; 1308 size_t len; 1309 int priv; 1310 { 1311 struct sadb_x_policy *xpl; 1312 struct secpolicy **pcb_sp; 1313 1314 /* sanity check. */ 1315 if (inp == NULL || request == NULL) 1316 return EINVAL; 1317 if (len < sizeof(*xpl)) 1318 return EINVAL; 1319 xpl = (struct sadb_x_policy *)request; 1320 1321 IPSEC_ASSERT(inp->inp_sp != NULL, 1322 ("ipsec4_set_policy(): null inp->in_sp")); 1323 1324 /* select direction */ 1325 switch (xpl->sadb_x_policy_dir) { 1326 case IPSEC_DIR_INBOUND: 1327 pcb_sp = &inp->inp_sp->sp_in; 1328 break; 1329 case IPSEC_DIR_OUTBOUND: 1330 pcb_sp = &inp->inp_sp->sp_out; 1331 break; 1332 default: 1333 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1334 xpl->sadb_x_policy_dir)); 1335 return EINVAL; 1336 } 1337 1338 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1339 } 1340 1341 int 1342 ipsec4_get_policy(inp, request, len, mp) 1343 struct inpcb *inp; 1344 caddr_t request; 1345 size_t len; 1346 struct mbuf **mp; 1347 { 1348 struct sadb_x_policy *xpl; 1349 struct secpolicy *pcb_sp; 1350 1351 /* sanity check. */ 1352 if (inp == NULL || request == NULL || mp == NULL) 1353 return EINVAL; 1354 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1355 if (len < sizeof(*xpl)) 1356 return EINVAL; 1357 xpl = (struct sadb_x_policy *)request; 1358 1359 /* select direction */ 1360 switch (xpl->sadb_x_policy_dir) { 1361 case IPSEC_DIR_INBOUND: 1362 pcb_sp = inp->inp_sp->sp_in; 1363 break; 1364 case IPSEC_DIR_OUTBOUND: 1365 pcb_sp = inp->inp_sp->sp_out; 1366 break; 1367 default: 1368 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1369 xpl->sadb_x_policy_dir)); 1370 return EINVAL; 1371 } 1372 1373 return ipsec_get_policy(pcb_sp, mp); 1374 } 1375 1376 /* delete policy in PCB */ 1377 int 1378 ipsec4_delete_pcbpolicy(inp) 1379 struct inpcb *inp; 1380 { 1381 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1382 1383 if (inp->inp_sp == NULL) 1384 return 0; 1385 1386 if (inp->inp_sp->sp_in != NULL) 1387 KEY_FREESP(&inp->inp_sp->sp_in); 1388 1389 if (inp->inp_sp->sp_out != NULL) 1390 KEY_FREESP(&inp->inp_sp->sp_out); 1391 1392 ipsec_delpcbpolicy(inp->inp_sp); 1393 inp->inp_sp = NULL; 1394 1395 return 0; 1396 } 1397 1398 #ifdef INET6 1399 int 1400 ipsec6_set_policy(in6p, optname, request, len, priv) 1401 struct in6pcb *in6p; 1402 int optname; 1403 caddr_t request; 1404 size_t len; 1405 int priv; 1406 { 1407 struct sadb_x_policy *xpl; 1408 struct secpolicy **pcb_sp; 1409 1410 /* sanity check. */ 1411 if (in6p == NULL || request == NULL) 1412 return EINVAL; 1413 if (len < sizeof(*xpl)) 1414 return EINVAL; 1415 xpl = (struct sadb_x_policy *)request; 1416 1417 /* select direction */ 1418 switch (xpl->sadb_x_policy_dir) { 1419 case IPSEC_DIR_INBOUND: 1420 pcb_sp = &in6p->in6p_sp->sp_in; 1421 break; 1422 case IPSEC_DIR_OUTBOUND: 1423 pcb_sp = &in6p->in6p_sp->sp_out; 1424 break; 1425 default: 1426 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1427 xpl->sadb_x_policy_dir)); 1428 return EINVAL; 1429 } 1430 1431 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1432 } 1433 1434 int 1435 ipsec6_get_policy(in6p, request, len, mp) 1436 struct in6pcb *in6p; 1437 caddr_t request; 1438 size_t len; 1439 struct mbuf **mp; 1440 { 1441 struct sadb_x_policy *xpl; 1442 struct secpolicy *pcb_sp; 1443 1444 /* sanity check. */ 1445 if (in6p == NULL || request == NULL || mp == NULL) 1446 return EINVAL; 1447 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1448 if (len < sizeof(*xpl)) 1449 return EINVAL; 1450 xpl = (struct sadb_x_policy *)request; 1451 1452 /* select direction */ 1453 switch (xpl->sadb_x_policy_dir) { 1454 case IPSEC_DIR_INBOUND: 1455 pcb_sp = in6p->in6p_sp->sp_in; 1456 break; 1457 case IPSEC_DIR_OUTBOUND: 1458 pcb_sp = in6p->in6p_sp->sp_out; 1459 break; 1460 default: 1461 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1462 xpl->sadb_x_policy_dir)); 1463 return EINVAL; 1464 } 1465 1466 return ipsec_get_policy(pcb_sp, mp); 1467 } 1468 1469 int 1470 ipsec6_delete_pcbpolicy(in6p) 1471 struct in6pcb *in6p; 1472 { 1473 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1474 1475 if (in6p->in6p_sp == NULL) 1476 return 0; 1477 1478 if (in6p->in6p_sp->sp_in != NULL) 1479 KEY_FREESP(&in6p->in6p_sp->sp_in); 1480 1481 if (in6p->in6p_sp->sp_out != NULL) 1482 KEY_FREESP(&in6p->in6p_sp->sp_out); 1483 1484 ipsec_delpcbpolicy(in6p->in6p_sp); 1485 in6p->in6p_sp = NULL; 1486 1487 return 0; 1488 } 1489 #endif 1490 1491 /* 1492 * return current level. 1493 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1494 */ 1495 u_int 1496 ipsec_get_reqlevel(isr) 1497 struct ipsecrequest *isr; 1498 { 1499 u_int level = 0; 1500 u_int esp_trans_deflev, esp_net_deflev; 1501 u_int ah_trans_deflev, ah_net_deflev; 1502 1503 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1504 ("ipsec_get_reqlevel: null argument")); 1505 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1506 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1507 isr->sp->spidx.src.sa.sa_family, 1508 isr->sp->spidx.dst.sa.sa_family)); 1509 1510 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1511 #define IPSEC_CHECK_DEFAULT(lev) \ 1512 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1513 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1514 ? (ipsec_debug \ 1515 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1516 (lev), IPSEC_LEVEL_REQUIRE) \ 1517 : 0), \ 1518 (lev) = IPSEC_LEVEL_REQUIRE, \ 1519 (lev) \ 1520 : (lev)) 1521 1522 /* set default level */ 1523 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1524 #ifdef INET 1525 case AF_INET: 1526 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1527 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1528 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1529 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1530 break; 1531 #endif 1532 #ifdef INET6 1533 case AF_INET6: 1534 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1535 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1536 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1537 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1538 break; 1539 #endif /* INET6 */ 1540 default: 1541 panic("key_get_reqlevel: unknown af %u", 1542 isr->sp->spidx.src.sa.sa_family); 1543 } 1544 1545 #undef IPSEC_CHECK_DEFAULT 1546 1547 /* set level */ 1548 switch (isr->level) { 1549 case IPSEC_LEVEL_DEFAULT: 1550 switch (isr->saidx.proto) { 1551 case IPPROTO_ESP: 1552 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1553 level = esp_net_deflev; 1554 else 1555 level = esp_trans_deflev; 1556 break; 1557 case IPPROTO_AH: 1558 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1559 level = ah_net_deflev; 1560 else 1561 level = ah_trans_deflev; 1562 break; 1563 case IPPROTO_IPCOMP: 1564 /* 1565 * we don't really care, as IPcomp document says that 1566 * we shouldn't compress small packets 1567 */ 1568 level = IPSEC_LEVEL_USE; 1569 break; 1570 default: 1571 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1572 isr->saidx.proto); 1573 } 1574 break; 1575 1576 case IPSEC_LEVEL_USE: 1577 case IPSEC_LEVEL_REQUIRE: 1578 level = isr->level; 1579 break; 1580 case IPSEC_LEVEL_UNIQUE: 1581 level = IPSEC_LEVEL_REQUIRE; 1582 break; 1583 1584 default: 1585 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1586 isr->level); 1587 } 1588 1589 return level; 1590 } 1591 1592 /* 1593 * Check security policy requirements against the actual 1594 * packet contents. Return one if the packet should be 1595 * reject as "invalid"; otherwiser return zero to have the 1596 * packet treated as "valid". 1597 * 1598 * OUT: 1599 * 0: valid 1600 * 1: invalid 1601 */ 1602 int 1603 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1604 { 1605 struct ipsecrequest *isr; 1606 int need_auth; 1607 1608 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1609 printf("ipsec_in_reject: using SP\n"); 1610 kdebug_secpolicy(sp)); 1611 1612 /* check policy */ 1613 switch (sp->policy) { 1614 case IPSEC_POLICY_DISCARD: 1615 return 1; 1616 case IPSEC_POLICY_BYPASS: 1617 case IPSEC_POLICY_NONE: 1618 return 0; 1619 } 1620 1621 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1622 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1623 1624 /* XXX should compare policy against ipsec header history */ 1625 1626 need_auth = 0; 1627 for (isr = sp->req; isr != NULL; isr = isr->next) { 1628 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1629 continue; 1630 switch (isr->saidx.proto) { 1631 case IPPROTO_ESP: 1632 if ((m->m_flags & M_DECRYPTED) == 0) { 1633 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1634 printf("ipsec_in_reject: ESP m_flags:%x\n", 1635 m->m_flags)); 1636 return 1; 1637 } 1638 1639 if (!need_auth && 1640 isr->sav != NULL && 1641 isr->sav->tdb_authalgxform != NULL && 1642 (m->m_flags & M_AUTHIPDGM) == 0) { 1643 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1644 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1645 m->m_flags)); 1646 return 1; 1647 } 1648 break; 1649 case IPPROTO_AH: 1650 need_auth = 1; 1651 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1652 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1653 printf("ipsec_in_reject: AH m_flags:%x\n", 1654 m->m_flags)); 1655 return 1; 1656 } 1657 break; 1658 case IPPROTO_IPCOMP: 1659 /* 1660 * we don't really care, as IPcomp document 1661 * says that we shouldn't compress small 1662 * packets, IPComp policy should always be 1663 * treated as being in "use" level. 1664 */ 1665 break; 1666 } 1667 } 1668 return 0; /* valid */ 1669 } 1670 1671 /* 1672 * Check AH/ESP integrity. 1673 * This function is called from tcp_input(), udp_input(), 1674 * and {ah,esp}4_input for tunnel mode 1675 */ 1676 int 1677 ipsec4_in_reject(m, inp) 1678 struct mbuf *m; 1679 struct inpcb *inp; 1680 { 1681 struct secpolicy *sp; 1682 int error; 1683 int result; 1684 1685 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1686 1687 /* get SP for this packet. 1688 * When we are called from ip_forward(), we call 1689 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1690 */ 1691 if (inp == NULL) 1692 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1693 else 1694 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1695 IN4PCB_TO_PCB(inp), &error); 1696 1697 if (sp != NULL) { 1698 result = ipsec_in_reject(sp, m); 1699 if (result) 1700 newipsecstat.ips_in_polvio++; 1701 KEY_FREESP(&sp); 1702 } else { 1703 result = 0; /* XXX should be panic ? 1704 * -> No, there may be error. */ 1705 } 1706 return result; 1707 } 1708 1709 1710 #ifdef INET6 1711 /* 1712 * Check AH/ESP integrity. 1713 * This function is called from tcp6_input(), udp6_input(), 1714 * and {ah,esp}6_input for tunnel mode 1715 */ 1716 int 1717 ipsec6_in_reject(m, in6p) 1718 struct mbuf *m; 1719 struct in6pcb *in6p; 1720 { 1721 struct secpolicy *sp = NULL; 1722 int error; 1723 int result; 1724 1725 /* sanity check */ 1726 if (m == NULL) 1727 return 0; /* XXX should be panic ? */ 1728 1729 /* get SP for this packet. 1730 * When we are called from ip_forward(), we call 1731 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1732 */ 1733 if (in6p == NULL) 1734 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1735 else 1736 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1737 IN6PCB_TO_PCB(in6p), 1738 &error); 1739 1740 if (sp != NULL) { 1741 result = ipsec_in_reject(sp, m); 1742 if (result) 1743 newipsecstat.ips_in_polvio++; 1744 KEY_FREESP(&sp); 1745 } else { 1746 result = 0; 1747 } 1748 return result; 1749 } 1750 #endif 1751 1752 /* 1753 * compute the byte size to be occupied by IPsec header. 1754 * in case it is tunneled, it includes the size of outer IP header. 1755 * NOTE: SP passed is free in this function. 1756 */ 1757 static size_t 1758 ipsec_hdrsiz(struct secpolicy *sp) 1759 { 1760 struct ipsecrequest *isr; 1761 size_t siz; 1762 1763 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1764 printf("ipsec_hdrsiz: using SP\n"); 1765 kdebug_secpolicy(sp)); 1766 1767 switch (sp->policy) { 1768 case IPSEC_POLICY_DISCARD: 1769 case IPSEC_POLICY_BYPASS: 1770 case IPSEC_POLICY_NONE: 1771 return 0; 1772 } 1773 1774 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1775 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1776 1777 siz = 0; 1778 for (isr = sp->req; isr != NULL; isr = isr->next) { 1779 size_t clen = 0; 1780 1781 switch (isr->saidx.proto) { 1782 case IPPROTO_ESP: 1783 clen = esp_hdrsiz(isr->sav); 1784 break; 1785 case IPPROTO_AH: 1786 clen = ah_hdrsiz(isr->sav); 1787 break; 1788 case IPPROTO_IPCOMP: 1789 clen = sizeof(struct ipcomp); 1790 break; 1791 } 1792 1793 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1794 switch (isr->saidx.dst.sa.sa_family) { 1795 case AF_INET: 1796 clen += sizeof(struct ip); 1797 break; 1798 #ifdef INET6 1799 case AF_INET6: 1800 clen += sizeof(struct ip6_hdr); 1801 break; 1802 #endif 1803 default: 1804 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1805 "unknown AF %d in IPsec tunnel SA\n", 1806 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1807 break; 1808 } 1809 } 1810 siz += clen; 1811 } 1812 1813 return siz; 1814 } 1815 1816 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1817 size_t 1818 ipsec4_hdrsiz(m, dir, inp) 1819 struct mbuf *m; 1820 u_int dir; 1821 struct inpcb *inp; 1822 { 1823 struct secpolicy *sp; 1824 int error; 1825 size_t size; 1826 1827 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1828 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1829 ("ipsec4_hdrsize: socket w/o inpcb")); 1830 1831 /* get SP for this packet. 1832 * When we are called from ip_forward(), we call 1833 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1834 */ 1835 if (inp == NULL) 1836 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1837 else 1838 sp = ipsec_getpolicybysock(m, dir, 1839 IN4PCB_TO_PCB(inp), &error); 1840 1841 if (sp != NULL) { 1842 size = ipsec_hdrsiz(sp); 1843 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1844 printf("ipsec4_hdrsiz: size:%lu.\n", 1845 (unsigned long)size)); 1846 1847 KEY_FREESP(&sp); 1848 } else { 1849 size = 0; /* XXX should be panic ? */ 1850 } 1851 return size; 1852 } 1853 1854 #ifdef INET6 1855 /* This function is called from ipsec6_hdrsize_tcp(), 1856 * and maybe from ip6_forward.() 1857 */ 1858 size_t 1859 ipsec6_hdrsiz(m, dir, in6p) 1860 struct mbuf *m; 1861 u_int dir; 1862 struct in6pcb *in6p; 1863 { 1864 struct secpolicy *sp; 1865 int error; 1866 size_t size; 1867 1868 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1869 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1870 ("ipsec6_hdrsize: socket w/o inpcb")); 1871 1872 /* get SP for this packet */ 1873 /* XXX Is it right to call with IP_FORWARDING. */ 1874 if (in6p == NULL) 1875 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1876 else 1877 sp = ipsec_getpolicybysock(m, dir, 1878 IN6PCB_TO_PCB(in6p), 1879 &error); 1880 1881 if (sp == NULL) 1882 return 0; 1883 size = ipsec_hdrsiz(sp); 1884 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1885 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1886 KEY_FREESP(&sp); 1887 1888 return size; 1889 } 1890 #endif /*INET6*/ 1891 1892 /* 1893 * Check the variable replay window. 1894 * ipsec_chkreplay() performs replay check before ICV verification. 1895 * ipsec_updatereplay() updates replay bitmap. This must be called after 1896 * ICV verification (it also performs replay check, which is usually done 1897 * beforehand). 1898 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1899 * 1900 * based on RFC 2401. 1901 */ 1902 int 1903 ipsec_chkreplay(seq, sav) 1904 u_int32_t seq; 1905 struct secasvar *sav; 1906 { 1907 const struct secreplay *replay; 1908 u_int32_t diff; 1909 int fr; 1910 u_int32_t wsizeb; /* constant: bits of window size */ 1911 int frlast; /* constant: last frame */ 1912 1913 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 1914 1915 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1916 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1917 1918 replay = sav->replay; 1919 1920 if (replay->wsize == 0) 1921 return 1; /* no need to check replay. */ 1922 1923 /* constant */ 1924 frlast = replay->wsize - 1; 1925 wsizeb = replay->wsize << 3; 1926 1927 /* sequence number of 0 is invalid */ 1928 if (seq == 0) 1929 return 0; 1930 1931 /* first time is always okay */ 1932 if (replay->count == 0) 1933 return 1; 1934 1935 if (seq > replay->lastseq) { 1936 /* larger sequences are okay */ 1937 return 1; 1938 } else { 1939 /* seq is equal or less than lastseq. */ 1940 diff = replay->lastseq - seq; 1941 1942 /* over range to check, i.e. too old or wrapped */ 1943 if (diff >= wsizeb) 1944 return 0; 1945 1946 fr = frlast - diff / 8; 1947 1948 /* this packet already seen ? */ 1949 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1950 return 0; 1951 1952 /* out of order but good */ 1953 return 1; 1954 } 1955 } 1956 1957 /* 1958 * check replay counter whether to update or not. 1959 * OUT: 0: OK 1960 * 1: NG 1961 */ 1962 int 1963 ipsec_updatereplay(seq, sav) 1964 u_int32_t seq; 1965 struct secasvar *sav; 1966 { 1967 struct secreplay *replay; 1968 u_int32_t diff; 1969 int fr; 1970 u_int32_t wsizeb; /* constant: bits of window size */ 1971 int frlast; /* constant: last frame */ 1972 1973 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 1974 1975 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 1976 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 1977 1978 replay = sav->replay; 1979 1980 if (replay->wsize == 0) 1981 goto ok; /* no need to check replay. */ 1982 1983 /* constant */ 1984 frlast = replay->wsize - 1; 1985 wsizeb = replay->wsize << 3; 1986 1987 /* sequence number of 0 is invalid */ 1988 if (seq == 0) 1989 return 1; 1990 1991 /* first time */ 1992 if (replay->count == 0) { 1993 replay->lastseq = seq; 1994 bzero(replay->bitmap, replay->wsize); 1995 (replay->bitmap)[frlast] = 1; 1996 goto ok; 1997 } 1998 1999 if (seq > replay->lastseq) { 2000 /* seq is larger than lastseq. */ 2001 diff = seq - replay->lastseq; 2002 2003 /* new larger sequence number */ 2004 if (diff < wsizeb) { 2005 /* In window */ 2006 /* set bit for this packet */ 2007 vshiftl(replay->bitmap, diff, replay->wsize); 2008 (replay->bitmap)[frlast] |= 1; 2009 } else { 2010 /* this packet has a "way larger" */ 2011 bzero(replay->bitmap, replay->wsize); 2012 (replay->bitmap)[frlast] = 1; 2013 } 2014 replay->lastseq = seq; 2015 2016 /* larger is good */ 2017 } else { 2018 /* seq is equal or less than lastseq. */ 2019 diff = replay->lastseq - seq; 2020 2021 /* over range to check, i.e. too old or wrapped */ 2022 if (diff >= wsizeb) 2023 return 1; 2024 2025 fr = frlast - diff / 8; 2026 2027 /* this packet already seen ? */ 2028 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2029 return 1; 2030 2031 /* mark as seen */ 2032 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2033 2034 /* out of order but good */ 2035 } 2036 2037 ok: 2038 if (replay->count == ~0) { 2039 2040 /* set overflow flag */ 2041 replay->overflow++; 2042 2043 /* don't increment, no more packets accepted */ 2044 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2045 return 1; 2046 2047 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2048 replay->overflow, ipsec_logsastr(sav))); 2049 } 2050 2051 replay->count++; 2052 2053 return 0; 2054 } 2055 2056 /* 2057 * shift variable length bunffer to left. 2058 * IN: bitmap: pointer to the buffer 2059 * nbit: the number of to shift. 2060 * wsize: buffer size (bytes). 2061 */ 2062 static void 2063 vshiftl(bitmap, nbit, wsize) 2064 unsigned char *bitmap; 2065 int nbit, wsize; 2066 { 2067 int s, j, i; 2068 unsigned char over; 2069 2070 for (j = 0; j < nbit; j += 8) { 2071 s = (nbit - j < 8) ? (nbit - j): 8; 2072 bitmap[0] <<= s; 2073 for (i = 1; i < wsize; i++) { 2074 over = (bitmap[i] >> (8 - s)); 2075 bitmap[i] <<= s; 2076 bitmap[i-1] |= over; 2077 } 2078 } 2079 2080 return; 2081 } 2082 2083 /* Return a printable string for the IPv4 address. */ 2084 static char * 2085 inet_ntoa4(struct in_addr ina) 2086 { 2087 static char buf[4][4 * sizeof "123" + 4]; 2088 unsigned char *ucp = (unsigned char *) &ina; 2089 static int i = 3; 2090 2091 i = (i + 1) % 4; 2092 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2093 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2094 return (buf[i]); 2095 } 2096 2097 /* Return a printable string for the address. */ 2098 const char * 2099 ipsec_address(union sockaddr_union* sa) 2100 { 2101 switch (sa->sa.sa_family) { 2102 #if INET 2103 case AF_INET: 2104 return inet_ntoa4(sa->sin.sin_addr); 2105 #endif /* INET */ 2106 2107 #if INET6 2108 case AF_INET6: 2109 return ip6_sprintf(&sa->sin6.sin6_addr); 2110 #endif /* INET6 */ 2111 2112 default: 2113 return "(unknown address family)"; 2114 } 2115 } 2116 2117 const char * 2118 ipsec_logsastr(sav) 2119 struct secasvar *sav; 2120 { 2121 static char buf[256]; 2122 char *p; 2123 struct secasindex *saidx = &sav->sah->saidx; 2124 2125 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2126 ("ipsec_logsastr: address family mismatch")); 2127 2128 p = buf; 2129 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2130 while (p && *p) 2131 p++; 2132 /* NB: only use ipsec_address on one address at a time */ 2133 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2134 ipsec_address(&saidx->src)); 2135 while (p && *p) 2136 p++; 2137 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2138 ipsec_address(&saidx->dst)); 2139 2140 return buf; 2141 } 2142 2143 void 2144 ipsec_dumpmbuf(m) 2145 struct mbuf *m; 2146 { 2147 int totlen; 2148 int i; 2149 u_char *p; 2150 2151 totlen = 0; 2152 printf("---\n"); 2153 while (m) { 2154 p = mtod(m, u_char *); 2155 for (i = 0; i < m->m_len; i++) { 2156 printf("%02x ", p[i]); 2157 totlen++; 2158 if (totlen % 16 == 0) 2159 printf("\n"); 2160 } 2161 m = m->m_next; 2162 } 2163 if (totlen % 16 != 0) 2164 printf("\n"); 2165 printf("---\n"); 2166 } 2167 2168 /* XXX this stuff doesn't belong here... */ 2169 2170 static struct xformsw* xforms = NULL; 2171 2172 /* 2173 * Register a transform; typically at system startup. 2174 */ 2175 void 2176 xform_register(struct xformsw* xsp) 2177 { 2178 xsp->xf_next = xforms; 2179 xforms = xsp; 2180 } 2181 2182 /* 2183 * Initialize transform support in an sav. 2184 */ 2185 int 2186 xform_init(struct secasvar *sav, int xftype) 2187 { 2188 struct xformsw *xsp; 2189 2190 if (sav->tdb_xform != NULL) /* previously initialized */ 2191 return 0; 2192 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2193 if (xsp->xf_type == xftype) 2194 return (*xsp->xf_init)(sav, xsp); 2195 2196 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2197 return EINVAL; 2198 } 2199 2200 #ifdef __NetBSD__ 2201 void 2202 ipsec_attach(void) 2203 { 2204 printf("initializing IPsec..."); 2205 ah_attach(); 2206 esp_attach(); 2207 ipcomp_attach(); 2208 ipe4_attach(); 2209 #ifdef TCP_SIGNATURE 2210 tcpsignature_attach(); 2211 #endif 2212 printf(" done\n"); 2213 } 2214 #endif /* __NetBSD__ */ 2215
Indexes created Mon Sep 22 13:09:51 GMT 2025