ipsec.c revision 1.143
1 /* $NetBSD: ipsec.c,v 1.143 2018/02/27 13:36:21 maxv Exp $ */ 2 /* $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 1.143 2018/02/27 13:36:21 maxv Exp $"); 36 37 /* 38 * IPsec controller part. 39 */ 40 41 #if defined(_KERNEL_OPT) 42 #include "opt_inet.h" 43 #include "opt_ipsec.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/mbuf.h> 49 #include <sys/domain.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/errno.h> 54 #include <sys/time.h> 55 #include <sys/kernel.h> 56 #include <sys/syslog.h> 57 #include <sys/sysctl.h> 58 #include <sys/proc.h> 59 #include <sys/kauth.h> 60 #include <sys/cpu.h> 61 #include <sys/kmem.h> 62 #include <sys/pserialize.h> 63 64 #include <net/if.h> 65 #include <net/route.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/in_var.h> 72 #include <netinet/udp.h> 73 #include <netinet/udp_var.h> 74 #include <netinet/tcp.h> 75 #include <netinet/udp.h> 76 #include <netinet/ip_icmp.h> 77 #include <netinet/ip_private.h> 78 79 #include <netinet/ip6.h> 80 #ifdef INET6 81 #include <netinet6/ip6_var.h> 82 #endif 83 #include <netinet/in_pcb.h> 84 #ifdef INET6 85 #include <netinet6/in6_pcb.h> 86 #include <netinet/icmp6.h> 87 #endif 88 89 #include <netipsec/ipsec.h> 90 #include <netipsec/ipsec_var.h> 91 #include <netipsec/ipsec_private.h> 92 #ifdef INET6 93 #include <netipsec/ipsec6.h> 94 #endif 95 #include <netipsec/ah_var.h> 96 #include <netipsec/esp_var.h> 97 #include <netipsec/ipcomp.h> /*XXX*/ 98 #include <netipsec/ipcomp_var.h> 99 100 #include <netipsec/key.h> 101 #include <netipsec/keydb.h> 102 #include <netipsec/key_debug.h> 103 104 #include <netipsec/xform.h> 105 106 int ipsec_used = 0; 107 int ipsec_enabled = 1; 108 109 #ifdef IPSEC_DEBUG 110 int ipsec_debug = 1; 111 112 /* 113 * When set to 1, IPsec will send packets with the same sequence number. 114 * This allows to verify if the other side has proper replay attacks detection. 115 */ 116 int ipsec_replay = 0; 117 118 /* 119 * When set 1, IPsec will send packets with corrupted HMAC. 120 * This allows to verify if the other side properly detects modified packets. 121 */ 122 int ipsec_integrity = 0; 123 #else 124 int ipsec_debug = 0; 125 #endif 126 127 percpu_t *ipsecstat_percpu; 128 129 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 130 int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */ 131 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 132 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 133 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 134 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 135 struct secpolicy ip4_def_policy; 136 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 137 138 u_int ipsec_spdgen = 1; /* SPD generation # */ 139 140 static struct secpolicy ipsec_dummy_sp __read_mostly = { 141 .state = IPSEC_SPSTATE_ALIVE, 142 /* If ENTRUST, the dummy SP never be used. See ipsec_getpolicybysock. */ 143 .policy = IPSEC_POLICY_ENTRUST, 144 }; 145 146 static struct secpolicy *ipsec_checkpcbcache(struct mbuf *, 147 struct inpcbpolicy *, int); 148 static int ipsec_fillpcbcache(struct inpcbpolicy *, struct mbuf *, 149 struct secpolicy *, int); 150 static int ipsec_invalpcbcache(struct inpcbpolicy *, int); 151 152 /* 153 * Crypto support requirements: 154 * 155 * 1 require hardware support 156 * -1 require software support 157 * 0 take anything 158 */ 159 int crypto_support = 0; 160 161 static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int, 162 struct inpcb_hdr *, int *); 163 164 #ifdef INET6 165 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 166 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 167 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 168 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 169 struct secpolicy ip6_def_policy; 170 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 171 #endif 172 173 static int ipsec4_setspidx_inpcb(struct mbuf *, struct inpcb *); 174 #ifdef INET6 175 static int ipsec6_setspidx_in6pcb(struct mbuf *, struct in6pcb *); 176 #endif 177 static int ipsec_setspidx(struct mbuf *, struct secpolicyindex *, int); 178 static void ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *, int); 179 static int ipsec4_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); 180 #ifdef INET6 181 static void ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *, int); 182 static int ipsec6_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); 183 #endif 184 static void ipsec_delpcbpolicy(struct inpcbpolicy *); 185 #if 0 /* unused */ 186 static struct secpolicy *ipsec_deepcopy_policy(const struct secpolicy *); 187 #endif 188 static int ipsec_set_policy(struct secpolicy **, int, const void *, size_t, 189 kauth_cred_t); 190 static int ipsec_get_policy(struct secpolicy *, struct mbuf **); 191 static void ipsec_destroy_policy(struct secpolicy *); 192 static int ipsec_sp_reject(const struct secpolicy *, const struct mbuf *); 193 static void vshiftl(unsigned char *, int, int); 194 static size_t ipsec_sp_hdrsiz(const struct secpolicy *, const struct mbuf *); 195 196 /* 197 * Try to validate and use cached policy on a PCB. 198 */ 199 static struct secpolicy * 200 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir) 201 { 202 struct secpolicyindex spidx; 203 struct secpolicy *sp = NULL; 204 int s; 205 206 KASSERT(IPSEC_DIR_IS_VALID(dir)); 207 KASSERT(pcbsp != NULL); 208 KASSERT(dir < __arraycount(pcbsp->sp_cache)); 209 KASSERT(inph_locked(pcbsp->sp_inph)); 210 211 /* 212 * Checking the generation and sp->state and taking a reference to an SP 213 * must be in a critical section of pserialize. See key_unlink_sp. 214 */ 215 s = pserialize_read_enter(); 216 /* SPD table change invalidate all the caches. */ 217 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) { 218 ipsec_invalpcbcache(pcbsp, dir); 219 goto out; 220 } 221 sp = pcbsp->sp_cache[dir].cachesp; 222 if (sp == NULL) 223 goto out; 224 if (sp->state != IPSEC_SPSTATE_ALIVE) { 225 sp = NULL; 226 ipsec_invalpcbcache(pcbsp, dir); 227 goto out; 228 } 229 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) { 230 /* NB: assume ipsec_setspidx never sleep */ 231 if (ipsec_setspidx(m, &spidx, 1) != 0) { 232 sp = NULL; 233 goto out; 234 } 235 236 /* 237 * We have to make an exact match here since the cached rule 238 * might have lower priority than a rule that would otherwise 239 * have matched the packet. 240 */ 241 if (memcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, 242 sizeof(spidx))) { 243 sp = NULL; 244 goto out; 245 } 246 } else { 247 /* 248 * The pcb is connected, and the L4 code is sure that: 249 * - outgoing side uses inp_[lf]addr 250 * - incoming side looks up policy after inpcb lookup 251 * and address pair is know to be stable. We do not need 252 * to generate spidx again, nor check the address match again. 253 * 254 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 255 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 256 */ 257 } 258 259 sp->lastused = time_second; 260 KEY_SP_REF(sp); 261 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 262 "DP cause refcnt++:%d SP:%p\n", 263 key_sp_refcnt(sp), pcbsp->sp_cache[dir].cachesp); 264 out: 265 pserialize_read_exit(s); 266 return sp; 267 } 268 269 static int 270 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 271 struct secpolicy *sp, int dir) 272 { 273 274 KASSERT(IPSEC_DIR_IS_INOROUT(dir)); 275 KASSERT(dir < __arraycount(pcbsp->sp_cache)); 276 KASSERT(inph_locked(pcbsp->sp_inph)); 277 278 pcbsp->sp_cache[dir].cachesp = NULL; 279 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_UNKNOWN; 280 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 281 return EINVAL; 282 } 283 pcbsp->sp_cache[dir].cachesp = sp; 284 if (pcbsp->sp_cache[dir].cachesp) { 285 /* 286 * If the PCB is connected, we can remember a hint to 287 * possibly short-circuit IPsec processing in other places. 288 */ 289 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 290 switch (pcbsp->sp_cache[dir].cachesp->policy) { 291 case IPSEC_POLICY_NONE: 292 case IPSEC_POLICY_BYPASS: 293 pcbsp->sp_cache[dir].cachehint = 294 IPSEC_PCBHINT_NO; 295 break; 296 default: 297 pcbsp->sp_cache[dir].cachehint = 298 IPSEC_PCBHINT_YES; 299 } 300 } 301 } 302 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 303 304 return 0; 305 } 306 307 static int 308 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 309 { 310 int i; 311 312 KASSERT(inph_locked(pcbsp->sp_inph)); 313 314 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 315 if (dir != IPSEC_DIR_ANY && i != dir) 316 continue; 317 pcbsp->sp_cache[i].cachesp = NULL; 318 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_UNKNOWN; 319 pcbsp->sp_cache[i].cachegen = 0; 320 memset(&pcbsp->sp_cache[i].cacheidx, 0, 321 sizeof(pcbsp->sp_cache[i].cacheidx)); 322 } 323 return 0; 324 } 325 326 void 327 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 328 { 329 330 KASSERT(inph_locked(pcbsp->sp_inph)); 331 332 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 333 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 334 } 335 336 void 337 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 338 { 339 340 KASSERT(inph_locked(pcbsp->sp_inph)); 341 342 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 343 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 344 } 345 346 void 347 ipsec_invalpcbcacheall(void) 348 { 349 350 if (ipsec_spdgen == UINT_MAX) 351 ipsec_spdgen = 1; 352 else 353 ipsec_spdgen++; 354 } 355 356 /* 357 * Return a held reference to the default SP. 358 */ 359 static struct secpolicy * 360 key_get_default_sp(int af, const char *where, int tag) 361 { 362 struct secpolicy *sp; 363 364 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, "DP from %s:%u\n", where, tag); 365 366 switch(af) { 367 case AF_INET: 368 sp = &ip4_def_policy; 369 break; 370 #ifdef INET6 371 case AF_INET6: 372 sp = &ip6_def_policy; 373 break; 374 #endif 375 default: 376 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 377 "unexpected protocol family %u\n", af); 378 return NULL; 379 } 380 381 if (sp->policy != IPSEC_POLICY_DISCARD && 382 sp->policy != IPSEC_POLICY_NONE) { 383 IPSECLOG(LOG_INFO, "fixed system default policy: %d->%d\n", 384 sp->policy, IPSEC_POLICY_NONE); 385 sp->policy = IPSEC_POLICY_NONE; 386 } 387 KEY_SP_REF(sp); 388 389 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, "DP returns SP:%p (%u)\n", 390 sp, key_sp_refcnt(sp)); 391 return sp; 392 } 393 394 #define KEY_GET_DEFAULT_SP(af) \ 395 key_get_default_sp((af), __func__, __LINE__) 396 397 /* 398 * For OUTBOUND packet having a socket. Searching SPD for packet, 399 * and return a pointer to SP. 400 * OUT: NULL: no apropreate SP found, the following value is set to error. 401 * 0 : bypass 402 * EACCES : discard packet. 403 * ENOENT : ipsec_acquire() in progress, maybe. 404 * others : error occurred. 405 * others: a pointer to SP 406 * 407 * NOTE: IPv6 mapped address concern is implemented here. 408 */ 409 static struct secpolicy * 410 ipsec_getpolicybysock(struct mbuf *m, u_int dir, struct inpcb_hdr *inph, 411 int *error) 412 { 413 struct inpcbpolicy *pcbsp = NULL; 414 struct secpolicy *currsp = NULL; /* policy on socket */ 415 struct secpolicy *sp; 416 int af; 417 418 KASSERT(m != NULL); 419 KASSERT(inph != NULL); 420 KASSERT(error != NULL); 421 KASSERTMSG(IPSEC_DIR_IS_INOROUT(dir), "invalid direction %u", dir); 422 423 KASSERT(inph->inph_socket != NULL); 424 KASSERT(inph_locked(inph)); 425 426 /* XXX FIXME inpcb/in6pcb vs socket*/ 427 af = inph->inph_af; 428 KASSERTMSG(af == AF_INET || af == AF_INET6, 429 "unexpected protocol family %u", af); 430 431 KASSERT(inph->inph_sp != NULL); 432 /* If we have a cached entry, and if it is still valid, use it. */ 433 IPSEC_STATINC(IPSEC_STAT_SPDCACHELOOKUP); 434 currsp = ipsec_checkpcbcache(m, inph->inph_sp, dir); 435 if (currsp) { 436 *error = 0; 437 return currsp; 438 } 439 IPSEC_STATINC(IPSEC_STAT_SPDCACHEMISS); 440 441 switch (af) { 442 case AF_INET: { 443 struct inpcb *in4p = (struct inpcb *)inph; 444 /* set spidx in pcb */ 445 *error = ipsec4_setspidx_inpcb(m, in4p); 446 pcbsp = in4p->inp_sp; 447 break; 448 } 449 #if defined(INET6) 450 case AF_INET6: { 451 struct in6pcb *in6p = (struct in6pcb *)inph; 452 /* set spidx in pcb */ 453 *error = ipsec6_setspidx_in6pcb(m, in6p); 454 pcbsp = in6p->in6p_sp; 455 break; 456 } 457 #endif 458 default: 459 *error = EPFNOSUPPORT; 460 break; 461 } 462 if (*error) 463 return NULL; 464 465 KASSERT(pcbsp != NULL); 466 switch (dir) { 467 case IPSEC_DIR_INBOUND: 468 currsp = pcbsp->sp_in; 469 break; 470 case IPSEC_DIR_OUTBOUND: 471 currsp = pcbsp->sp_out; 472 break; 473 } 474 KASSERT(currsp != NULL); 475 476 if (pcbsp->priv) { /* when privilieged socket */ 477 switch (currsp->policy) { 478 case IPSEC_POLICY_BYPASS: 479 case IPSEC_POLICY_IPSEC: 480 KEY_SP_REF(currsp); 481 sp = currsp; 482 break; 483 484 case IPSEC_POLICY_ENTRUST: 485 /* look for a policy in SPD */ 486 sp = KEY_LOOKUP_SP_BYSPIDX(&currsp->spidx, dir); 487 if (sp == NULL) /* no SP found */ 488 sp = KEY_GET_DEFAULT_SP(af); 489 break; 490 491 default: 492 IPSECLOG(LOG_ERR, "Invalid policy for PCB %d\n", 493 currsp->policy); 494 *error = EINVAL; 495 return NULL; 496 } 497 } else { /* unpriv, SPD has policy */ 498 sp = KEY_LOOKUP_SP_BYSPIDX(&currsp->spidx, dir); 499 if (sp == NULL) { /* no SP found */ 500 switch (currsp->policy) { 501 case IPSEC_POLICY_BYPASS: 502 IPSECLOG(LOG_ERR, "Illegal policy for " 503 "non-priviliged defined %d\n", 504 currsp->policy); 505 *error = EINVAL; 506 return NULL; 507 508 case IPSEC_POLICY_ENTRUST: 509 sp = KEY_GET_DEFAULT_SP(af); 510 break; 511 512 case IPSEC_POLICY_IPSEC: 513 KEY_SP_REF(currsp); 514 sp = currsp; 515 break; 516 517 default: 518 IPSECLOG(LOG_ERR, "Invalid policy for " 519 "PCB %d\n", currsp->policy); 520 *error = EINVAL; 521 return NULL; 522 } 523 } 524 } 525 KASSERTMSG(sp != NULL, "null SP (priv %u policy %u", pcbsp->priv, 526 currsp->policy); 527 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 528 "DP (priv %u policy %u) allocates SP:%p (refcnt %u)\n", 529 pcbsp->priv, currsp->policy, sp, key_sp_refcnt(sp)); 530 ipsec_fillpcbcache(pcbsp, m, sp, dir); 531 return sp; 532 } 533 534 /* 535 * For FORWARDING packet or OUTBOUND without a socket. Searching SPD for packet, 536 * and return a pointer to SP. 537 * OUT: positive: a pointer to the entry for security policy leaf matched. 538 * NULL: no apropreate SP found, the following value is set to error. 539 * 0 : bypass 540 * EACCES : discard packet. 541 * ENOENT : ipsec_acquire() in progress, maybe. 542 * others : error occurred. 543 */ 544 static struct secpolicy * 545 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) 546 { 547 struct secpolicyindex spidx; 548 struct secpolicy *sp; 549 550 KASSERT(m != NULL); 551 KASSERT(error != NULL); 552 KASSERTMSG(IPSEC_DIR_IS_INOROUT(dir), "invalid direction %u", dir); 553 554 sp = NULL; 555 556 /* Make an index to look for a policy. */ 557 *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1); 558 if (*error != 0) { 559 IPSECLOG(LOG_DEBUG, "setpidx failed, dir %u flag %u\n", dir, flag); 560 memset(&spidx, 0, sizeof(spidx)); 561 return NULL; 562 } 563 564 spidx.dir = dir; 565 566 if (key_havesp(dir)) { 567 sp = KEY_LOOKUP_SP_BYSPIDX(&spidx, dir); 568 } 569 570 if (sp == NULL) /* no SP found, use system default */ 571 sp = KEY_GET_DEFAULT_SP(spidx.dst.sa.sa_family); 572 KASSERT(sp != NULL); 573 return sp; 574 } 575 576 static struct secpolicy * 577 ipsec_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 578 void *inp) 579 { 580 struct secpolicy *sp; 581 582 *error = 0; 583 584 if (inp == NULL) { 585 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 586 } else { 587 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 588 KASSERT(inph->inph_socket != NULL); 589 sp = ipsec_getpolicybysock(m, dir, inph, error); 590 } 591 if (sp == NULL) { 592 KASSERTMSG(*error != 0, "getpolicy failed w/o error"); 593 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); 594 return NULL; 595 } 596 KASSERTMSG(*error == 0, "sp w/ error set to %u", *error); 597 598 switch (sp->policy) { 599 case IPSEC_POLICY_ENTRUST: 600 default: 601 printf("%s: invalid policy %u\n", __func__, sp->policy); 602 /* fall thru... */ 603 case IPSEC_POLICY_DISCARD: 604 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); 605 *error = -EINVAL; /* packet is discarded by caller */ 606 break; 607 case IPSEC_POLICY_BYPASS: 608 case IPSEC_POLICY_NONE: 609 KEY_SP_UNREF(&sp); 610 sp = NULL; /* NB: force NULL result */ 611 break; 612 case IPSEC_POLICY_IPSEC: 613 KASSERT(sp->req != NULL); 614 break; 615 } 616 617 if (*error != 0) { 618 KEY_SP_UNREF(&sp); 619 sp = NULL; 620 IPSECLOG(LOG_DEBUG, "done, error %d\n", *error); 621 } 622 623 return sp; 624 } 625 626 int 627 ipsec4_output(struct mbuf *m, struct inpcb *inp, int flags, 628 u_long *mtu, bool *natt_frag, bool *done) 629 { 630 struct secpolicy *sp = NULL; 631 int error, s; 632 633 /* 634 * Check the security policy (SP) for the packet and, if required, 635 * do IPsec-related processing. There are two cases here; the first 636 * time a packet is sent through it will be untagged and handled by 637 * ipsec_checkpolicy(). If the packet is resubmitted to ip_output 638 * (e.g. after AH, ESP, etc. processing), there will be a tag to 639 * bypass the lookup and related policy checking. 640 */ 641 if (ipsec_outdone(m)) { 642 return 0; 643 } 644 s = splsoftnet(); 645 if (inp && ipsec_pcb_skip_ipsec(inp->inp_sp, IPSEC_DIR_OUTBOUND)) { 646 splx(s); 647 return 0; 648 } 649 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, inp); 650 651 /* 652 * There are four return cases: 653 * sp != NULL apply IPsec policy 654 * sp == NULL, error == 0 no IPsec handling needed 655 * sp == NULL, error == -EINVAL discard packet w/o error 656 * sp == NULL, error != 0 discard packet, report error 657 */ 658 if (sp == NULL) { 659 splx(s); 660 if (error) { 661 /* 662 * Hack: -EINVAL is used to signal that a packet 663 * should be silently discarded. This is typically 664 * because we asked key management for an SA and 665 * it was delayed (e.g. kicked up to IKE). 666 */ 667 if (error == -EINVAL) 668 error = 0; 669 m_freem(m); 670 *done = true; 671 return error; 672 } 673 /* No IPsec processing for this packet. */ 674 return 0; 675 } 676 677 /* 678 * Do delayed checksums now because we send before 679 * this is done in the normal processing path. 680 */ 681 if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 682 in_delayed_cksum(m); 683 m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 684 } 685 686 { 687 u_long _mtu = 0; 688 689 error = ipsec4_process_packet(m, sp->req, &_mtu); 690 691 if (error == 0 && _mtu != 0) { 692 /* 693 * NAT-T ESP fragmentation: do not do IPSec processing 694 * now, we will do it on each fragmented packet. 695 */ 696 *mtu = _mtu; 697 *natt_frag = true; 698 KEY_SP_UNREF(&sp); 699 splx(s); 700 return 0; 701 } 702 } 703 704 /* 705 * Preserve KAME behaviour: ENOENT can be returned 706 * when an SA acquire is in progress. Don't propagate 707 * this to user-level; it confuses applications. 708 * 709 * XXX this will go away when the SADB is redone. 710 */ 711 if (error == ENOENT) 712 error = 0; 713 KEY_SP_UNREF(&sp); 714 splx(s); 715 *done = true; 716 return error; 717 } 718 719 int 720 ipsec4_input(struct mbuf *m, int flags) 721 { 722 struct secpolicy *sp; 723 int error, s; 724 725 s = splsoftnet(); 726 error = ipsec_in_reject(m, NULL); 727 splx(s); 728 if (error) { 729 return EINVAL; 730 } 731 732 if (flags == 0) { 733 /* We are done. */ 734 return 0; 735 } 736 737 /* 738 * Peek at the outbound SP for this packet to determine if 739 * it is a Fast Forward candidate. 740 */ 741 s = splsoftnet(); 742 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, NULL); 743 if (sp != NULL) { 744 m->m_flags &= ~M_CANFASTFWD; 745 KEY_SP_UNREF(&sp); 746 } 747 splx(s); 748 return 0; 749 } 750 751 int 752 ipsec4_forward(struct mbuf *m, int *destmtu) 753 { 754 /* 755 * If the packet is routed over IPsec tunnel, tell the 756 * originator the tunnel MTU. 757 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 758 * XXX quickhack!!! 759 */ 760 struct secpolicy *sp; 761 size_t ipsechdr; 762 int error; 763 764 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, IP_FORWARDING, 765 &error); 766 if (sp == NULL) { 767 return EINVAL; 768 } 769 770 /* Count IPsec header size. */ 771 ipsechdr = ipsec_sp_hdrsiz(sp, m); 772 773 /* 774 * Find the correct route for outer IPv4 header, compute tunnel MTU. 775 */ 776 if (sp->req) { 777 struct secasvar *sav; 778 779 sav = ipsec_lookup_sa(sp->req, m); 780 if (sav != NULL) { 781 struct route *ro; 782 struct rtentry *rt; 783 784 ro = &sav->sah->sa_route; 785 rt = rtcache_validate(ro); 786 if (rt && rt->rt_ifp) { 787 *destmtu = rt->rt_rmx.rmx_mtu ? 788 rt->rt_rmx.rmx_mtu : rt->rt_ifp->if_mtu; 789 *destmtu -= ipsechdr; 790 } 791 rtcache_unref(rt, ro); 792 KEY_SA_UNREF(&sav); 793 } 794 } 795 KEY_SP_UNREF(&sp); 796 return 0; 797 } 798 799 static int 800 ipsec4_setspidx_inpcb(struct mbuf *m, struct inpcb *pcb) 801 { 802 int error; 803 804 KASSERT(pcb != NULL); 805 KASSERT(pcb->inp_sp != NULL); 806 KASSERT(pcb->inp_sp->sp_out != NULL); 807 KASSERT(pcb->inp_sp->sp_in != NULL); 808 809 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 810 if (error == 0) { 811 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 812 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 813 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 814 } else { 815 memset(&pcb->inp_sp->sp_in->spidx, 0, 816 sizeof(pcb->inp_sp->sp_in->spidx)); 817 memset(&pcb->inp_sp->sp_out->spidx, 0, 818 sizeof(pcb->inp_sp->sp_in->spidx)); 819 } 820 return error; 821 } 822 823 #ifdef INET6 824 static int 825 ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb) 826 { 827 struct secpolicyindex *spidx; 828 int error; 829 830 KASSERT(pcb != NULL); 831 KASSERT(pcb->in6p_sp != NULL); 832 KASSERT(pcb->in6p_sp->sp_out != NULL); 833 KASSERT(pcb->in6p_sp->sp_in != NULL); 834 835 memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx)); 836 memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx)); 837 838 spidx = &pcb->in6p_sp->sp_in->spidx; 839 error = ipsec_setspidx(m, spidx, 1); 840 if (error) 841 goto bad; 842 spidx->dir = IPSEC_DIR_INBOUND; 843 844 spidx = &pcb->in6p_sp->sp_out->spidx; 845 error = ipsec_setspidx(m, spidx, 1); 846 if (error) 847 goto bad; 848 spidx->dir = IPSEC_DIR_OUTBOUND; 849 850 return 0; 851 852 bad: 853 memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx)); 854 memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx)); 855 return error; 856 } 857 #endif 858 859 /* 860 * configure security policy index (src/dst/proto/sport/dport) 861 * by looking at the content of mbuf. 862 * the caller is responsible for error recovery (like clearing up spidx). 863 */ 864 static int 865 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) 866 { 867 struct ip *ip = NULL; 868 struct ip ipbuf; 869 u_int v; 870 struct mbuf *n; 871 int len; 872 int error; 873 874 KASSERT(m != NULL); 875 876 /* 877 * validate m->m_pkthdr.len. we see incorrect length if we 878 * mistakenly call this function with inconsistent mbuf chain 879 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 880 */ 881 len = 0; 882 for (n = m; n; n = n->m_next) 883 len += n->m_len; 884 if (m->m_pkthdr.len != len) { 885 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 886 "total of m_len(%d) != pkthdr.len(%d), ignored.\n", 887 len, m->m_pkthdr.len); 888 KASSERTMSG(0, "impossible"); 889 return EINVAL; 890 } 891 892 if (m->m_pkthdr.len < sizeof(struct ip)) { 893 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 894 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 895 m->m_pkthdr.len); 896 return EINVAL; 897 } 898 899 if (m->m_len >= sizeof(*ip)) { 900 ip = mtod(m, struct ip *); 901 } else { 902 m_copydata(m, 0, sizeof(ipbuf), &ipbuf); 903 ip = &ipbuf; 904 } 905 v = ip->ip_v; 906 switch (v) { 907 case 4: 908 error = ipsec4_setspidx_ipaddr(m, spidx); 909 if (error) 910 return error; 911 ipsec4_get_ulp(m, spidx, needport); 912 return 0; 913 #ifdef INET6 914 case 6: 915 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 916 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 917 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 918 "ignored.\n", m->m_pkthdr.len); 919 return EINVAL; 920 } 921 error = ipsec6_setspidx_ipaddr(m, spidx); 922 if (error) 923 return error; 924 ipsec6_get_ulp(m, spidx, needport); 925 return 0; 926 #endif 927 default: 928 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 929 "unknown IP version %u, ignored.\n", v); 930 return EINVAL; 931 } 932 } 933 934 static void 935 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 936 { 937 u_int8_t nxt; 938 int off; 939 940 KASSERT(m != NULL); 941 KASSERTMSG(m->m_pkthdr.len >= sizeof(struct ip), "packet too short"); 942 943 /* NB: ip_input() flips it into host endian XXX need more checking */ 944 if (m->m_len >= sizeof(struct ip)) { 945 struct ip *ip = mtod(m, struct ip *); 946 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) 947 goto done; 948 off = ip->ip_hl << 2; 949 nxt = ip->ip_p; 950 } else { 951 struct ip ih; 952 953 m_copydata(m, 0, sizeof(struct ip), &ih); 954 if (ih.ip_off & htons(IP_MF | IP_OFFMASK)) 955 goto done; 956 off = ih.ip_hl << 2; 957 nxt = ih.ip_p; 958 } 959 960 while (off < m->m_pkthdr.len) { 961 struct ip6_ext ip6e; 962 struct tcphdr th; 963 struct udphdr uh; 964 struct icmp icmph; 965 966 switch (nxt) { 967 case IPPROTO_TCP: 968 spidx->ul_proto = nxt; 969 if (!needport) 970 goto done_proto; 971 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 972 goto done; 973 m_copydata(m, off, sizeof(th), &th); 974 spidx->src.sin.sin_port = th.th_sport; 975 spidx->dst.sin.sin_port = th.th_dport; 976 return; 977 case IPPROTO_UDP: 978 spidx->ul_proto = nxt; 979 if (!needport) 980 goto done_proto; 981 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 982 goto done; 983 m_copydata(m, off, sizeof(uh), &uh); 984 spidx->src.sin.sin_port = uh.uh_sport; 985 spidx->dst.sin.sin_port = uh.uh_dport; 986 return; 987 case IPPROTO_AH: 988 if (off + sizeof(ip6e) > m->m_pkthdr.len) 989 goto done; 990 /* XXX sigh, this works but is totally bogus */ 991 m_copydata(m, off, sizeof(ip6e), &ip6e); 992 off += (ip6e.ip6e_len + 2) << 2; 993 nxt = ip6e.ip6e_nxt; 994 break; 995 case IPPROTO_ICMP: 996 spidx->ul_proto = nxt; 997 if (off + sizeof(struct icmp) > m->m_pkthdr.len) 998 goto done; 999 m_copydata(m, off, sizeof(icmph), &icmph); 1000 ((struct sockaddr_in *)&spidx->src)->sin_port = 1001 htons((uint16_t)icmph.icmp_type); 1002 ((struct sockaddr_in *)&spidx->dst)->sin_port = 1003 htons((uint16_t)icmph.icmp_code); 1004 return; 1005 default: 1006 /* XXX intermediate headers??? */ 1007 spidx->ul_proto = nxt; 1008 goto done_proto; 1009 } 1010 } 1011 done: 1012 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1013 done_proto: 1014 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 1015 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 1016 } 1017 1018 static int 1019 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1020 { 1021 static const struct sockaddr_in template = { 1022 sizeof(struct sockaddr_in), 1023 AF_INET, 1024 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 1025 }; 1026 1027 spidx->src.sin = template; 1028 spidx->dst.sin = template; 1029 1030 if (m->m_len < sizeof(struct ip)) { 1031 m_copydata(m, offsetof(struct ip, ip_src), 1032 sizeof(struct in_addr), &spidx->src.sin.sin_addr); 1033 m_copydata(m, offsetof(struct ip, ip_dst), 1034 sizeof(struct in_addr), &spidx->dst.sin.sin_addr); 1035 } else { 1036 struct ip *ip = mtod(m, struct ip *); 1037 spidx->src.sin.sin_addr = ip->ip_src; 1038 spidx->dst.sin.sin_addr = ip->ip_dst; 1039 } 1040 1041 spidx->prefs = sizeof(struct in_addr) << 3; 1042 spidx->prefd = sizeof(struct in_addr) << 3; 1043 1044 return 0; 1045 } 1046 1047 #ifdef INET6 1048 static void 1049 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 1050 { 1051 int off, nxt; 1052 struct tcphdr th; 1053 struct udphdr uh; 1054 struct icmp6_hdr icmph; 1055 1056 KASSERT(m != NULL); 1057 1058 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1059 kdebug_mbuf(__func__, m); 1060 } 1061 1062 /* set default */ 1063 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1064 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1065 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1066 1067 nxt = -1; 1068 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1069 if (off < 0 || m->m_pkthdr.len < off) 1070 return; 1071 1072 switch (nxt) { 1073 case IPPROTO_TCP: 1074 spidx->ul_proto = nxt; 1075 if (!needport) 1076 break; 1077 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1078 break; 1079 m_copydata(m, off, sizeof(th), &th); 1080 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1081 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1082 break; 1083 case IPPROTO_UDP: 1084 spidx->ul_proto = nxt; 1085 if (!needport) 1086 break; 1087 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1088 break; 1089 m_copydata(m, off, sizeof(uh), &uh); 1090 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1091 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1092 break; 1093 case IPPROTO_ICMPV6: 1094 spidx->ul_proto = nxt; 1095 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 1096 break; 1097 m_copydata(m, off, sizeof(icmph), &icmph); 1098 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 1099 htons((uint16_t)icmph.icmp6_type); 1100 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 1101 htons((uint16_t)icmph.icmp6_code); 1102 break; 1103 default: 1104 /* XXX intermediate headers??? */ 1105 spidx->ul_proto = nxt; 1106 break; 1107 } 1108 } 1109 1110 static int 1111 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1112 { 1113 struct ip6_hdr *ip6 = NULL; 1114 struct ip6_hdr ip6buf; 1115 struct sockaddr_in6 *sin6; 1116 1117 if (m->m_len >= sizeof(*ip6)) 1118 ip6 = mtod(m, struct ip6_hdr *); 1119 else { 1120 m_copydata(m, 0, sizeof(ip6buf), &ip6buf); 1121 ip6 = &ip6buf; 1122 } 1123 1124 sin6 = (struct sockaddr_in6 *)&spidx->src; 1125 memset(sin6, 0, sizeof(*sin6)); 1126 sin6->sin6_family = AF_INET6; 1127 sin6->sin6_len = sizeof(struct sockaddr_in6); 1128 memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); 1129 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1130 sin6->sin6_addr.s6_addr16[1] = 0; 1131 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1132 } 1133 spidx->prefs = sizeof(struct in6_addr) << 3; 1134 1135 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1136 memset(sin6, 0, sizeof(*sin6)); 1137 sin6->sin6_family = AF_INET6; 1138 sin6->sin6_len = sizeof(struct sockaddr_in6); 1139 memcpy(&sin6->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); 1140 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1141 sin6->sin6_addr.s6_addr16[1] = 0; 1142 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1143 } 1144 spidx->prefd = sizeof(struct in6_addr) << 3; 1145 1146 return 0; 1147 } 1148 #endif 1149 1150 static void 1151 ipsec_delpcbpolicy(struct inpcbpolicy *p) 1152 { 1153 1154 kmem_intr_free(p, sizeof(*p)); 1155 } 1156 1157 /* initialize policy in PCB */ 1158 int 1159 ipsec_init_policy(struct socket *so, struct inpcbpolicy **policy) 1160 { 1161 struct inpcbpolicy *new; 1162 1163 KASSERT(so != NULL); 1164 KASSERT(policy != NULL); 1165 1166 new = kmem_intr_zalloc(sizeof(*new), KM_NOSLEEP); 1167 if (new == NULL) { 1168 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 1169 return ENOBUFS; 1170 } 1171 1172 if (IPSEC_PRIVILEGED_SO(so)) 1173 new->priv = 1; 1174 else 1175 new->priv = 0; 1176 1177 /* 1178 * Set dummy SPs. Actual SPs will be allocated later if needed. 1179 */ 1180 new->sp_in = &ipsec_dummy_sp; 1181 new->sp_out = &ipsec_dummy_sp; 1182 1183 *policy = new; 1184 1185 return 0; 1186 } 1187 1188 #if 0 /* unused */ 1189 /* copy old ipsec policy into new */ 1190 int 1191 ipsec_copy_policy(const struct inpcbpolicy *old, struct inpcbpolicy *new) 1192 { 1193 struct secpolicy *sp; 1194 1195 sp = ipsec_deepcopy_policy(old->sp_in); 1196 if (sp) { 1197 KEY_SP_UNREF(&new->sp_in); 1198 new->sp_in = sp; 1199 } else 1200 return ENOBUFS; 1201 1202 sp = ipsec_deepcopy_policy(old->sp_out); 1203 if (sp) { 1204 KEY_SP_UNREF(&new->sp_out); 1205 new->sp_out = sp; 1206 } else 1207 return ENOBUFS; 1208 1209 new->priv = old->priv; 1210 1211 return 0; 1212 } 1213 1214 /* deep-copy a policy in PCB */ 1215 static struct secpolicy * 1216 ipsec_deepcopy_policy(const struct secpolicy *src) 1217 { 1218 struct ipsecrequest *newchain = NULL; 1219 const struct ipsecrequest *p; 1220 struct ipsecrequest **q; 1221 struct secpolicy *dst; 1222 1223 if (src == NULL) 1224 return NULL; 1225 dst = KEY_NEWSP(); 1226 if (dst == NULL) 1227 return NULL; 1228 1229 /* 1230 * deep-copy IPsec request chain. This is required since struct 1231 * ipsecrequest is not reference counted. 1232 */ 1233 q = &newchain; 1234 for (p = src->req; p; p = p->next) { 1235 *q = kmem_zalloc(sizeof(**q), KM_SLEEP); 1236 (*q)->next = NULL; 1237 1238 (*q)->saidx.proto = p->saidx.proto; 1239 (*q)->saidx.mode = p->saidx.mode; 1240 (*q)->level = p->level; 1241 (*q)->saidx.reqid = p->saidx.reqid; 1242 1243 memcpy(&(*q)->saidx.src, &p->saidx.src, sizeof((*q)->saidx.src)); 1244 memcpy(&(*q)->saidx.dst, &p->saidx.dst, sizeof((*q)->saidx.dst)); 1245 1246 (*q)->sp = dst; 1247 1248 q = &((*q)->next); 1249 } 1250 1251 dst->req = newchain; 1252 dst->state = src->state; 1253 dst->policy = src->policy; 1254 /* do not touch the refcnt fields */ 1255 1256 return dst; 1257 } 1258 #endif 1259 1260 static void 1261 ipsec_destroy_policy(struct secpolicy *sp) 1262 { 1263 1264 if (sp == &ipsec_dummy_sp) 1265 ; /* It's dummy. No need to free it. */ 1266 else { 1267 /* 1268 * We cannot destroy here because it can be called in 1269 * softint. So mark the SP as DEAD and let the timer 1270 * destroy it. See key_timehandler_spd. 1271 */ 1272 sp->state = IPSEC_SPSTATE_DEAD; 1273 } 1274 } 1275 1276 /* set policy and ipsec request if present. */ 1277 static int 1278 ipsec_set_policy(struct secpolicy **policy, int optname, const void *request, 1279 size_t len, kauth_cred_t cred) 1280 { 1281 const struct sadb_x_policy *xpl; 1282 struct secpolicy *newsp = NULL, *oldsp; 1283 int error; 1284 1285 KASSERT(!cpu_softintr_p()); 1286 1287 /* sanity check. */ 1288 if (policy == NULL || *policy == NULL || request == NULL) 1289 return EINVAL; 1290 if (len < sizeof(*xpl)) 1291 return EINVAL; 1292 xpl = (const struct sadb_x_policy *)request; 1293 1294 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1295 kdebug_sadb_xpolicy("set passed policy", request); 1296 } 1297 1298 /* check policy type */ 1299 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1300 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD || 1301 xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1302 return EINVAL; 1303 1304 /* check privileged socket */ 1305 if (xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1306 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPSEC, 1307 KAUTH_REQ_NETWORK_IPSEC_BYPASS, NULL, NULL, NULL); 1308 if (error) 1309 return error; 1310 } 1311 1312 /* allocation new SP entry */ 1313 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1314 return error; 1315 1316 key_init_sp(newsp); 1317 newsp->created = time_uptime; 1318 /* Insert the global list for SPs for sockets */ 1319 key_socksplist_add(newsp); 1320 1321 /* clear old SP and set new SP */ 1322 oldsp = *policy; 1323 *policy = newsp; 1324 ipsec_destroy_policy(oldsp); 1325 1326 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1327 printf("%s: new policy\n", __func__); 1328 kdebug_secpolicy(newsp); 1329 } 1330 1331 return 0; 1332 } 1333 1334 static int 1335 ipsec_get_policy(struct secpolicy *policy, struct mbuf **mp) 1336 { 1337 1338 /* sanity check. */ 1339 if (policy == NULL || mp == NULL) 1340 return EINVAL; 1341 1342 *mp = key_sp2msg(policy, M_NOWAIT); 1343 if (!*mp) { 1344 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 1345 return ENOBUFS; 1346 } 1347 1348 (*mp)->m_type = MT_DATA; 1349 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1350 kdebug_mbuf(__func__, *mp); 1351 } 1352 1353 return 0; 1354 } 1355 1356 int 1357 ipsec4_set_policy(struct inpcb *inp, int optname, const void *request, 1358 size_t len, kauth_cred_t cred) 1359 { 1360 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1361 const struct sadb_x_policy *xpl; 1362 struct secpolicy **policy; 1363 1364 KASSERT(!cpu_softintr_p()); 1365 KASSERT(inph != NULL); 1366 KASSERT(inph_locked(inph)); 1367 KASSERT(request != NULL); 1368 1369 if (len < sizeof(*xpl)) 1370 return EINVAL; 1371 xpl = (const struct sadb_x_policy *)request; 1372 1373 KASSERT(inph->inph_sp != NULL); 1374 1375 /* select direction */ 1376 switch (xpl->sadb_x_policy_dir) { 1377 case IPSEC_DIR_INBOUND: 1378 policy = &inph->inph_sp->sp_in; 1379 break; 1380 case IPSEC_DIR_OUTBOUND: 1381 policy = &inph->inph_sp->sp_out; 1382 break; 1383 default: 1384 IPSECLOG(LOG_ERR, "invalid direction=%u\n", 1385 xpl->sadb_x_policy_dir); 1386 return EINVAL; 1387 } 1388 1389 return ipsec_set_policy(policy, optname, request, len, cred); 1390 } 1391 1392 int 1393 ipsec4_get_policy(struct inpcb *inp, const void *request, size_t len, 1394 struct mbuf **mp) 1395 { 1396 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1397 const struct sadb_x_policy *xpl; 1398 struct secpolicy *policy; 1399 1400 /* sanity check. */ 1401 if (inph == NULL || request == NULL || mp == NULL) 1402 return EINVAL; 1403 KASSERT(inph->inph_sp != NULL); 1404 if (len < sizeof(*xpl)) 1405 return EINVAL; 1406 xpl = (const struct sadb_x_policy *)request; 1407 1408 /* select direction */ 1409 switch (xpl->sadb_x_policy_dir) { 1410 case IPSEC_DIR_INBOUND: 1411 policy = inph->inph_sp->sp_in; 1412 break; 1413 case IPSEC_DIR_OUTBOUND: 1414 policy = inph->inph_sp->sp_out; 1415 break; 1416 default: 1417 IPSECLOG(LOG_ERR, "invalid direction=%u\n", 1418 xpl->sadb_x_policy_dir); 1419 return EINVAL; 1420 } 1421 1422 return ipsec_get_policy(policy, mp); 1423 } 1424 1425 int 1426 ipsec4_delete_pcbpolicy(struct inpcb *inp) 1427 { 1428 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1429 1430 KASSERT(inph != NULL); 1431 1432 if (inph->inph_sp == NULL) 1433 return 0; 1434 1435 if (inph->inph_sp->sp_in != NULL) 1436 ipsec_destroy_policy(inph->inph_sp->sp_in); 1437 1438 if (inph->inph_sp->sp_out != NULL) 1439 ipsec_destroy_policy(inph->inph_sp->sp_out); 1440 1441 ipsec_invalpcbcache(inph->inph_sp, IPSEC_DIR_ANY); 1442 1443 ipsec_delpcbpolicy(inph->inph_sp); 1444 inph->inph_sp = NULL; 1445 1446 return 0; 1447 } 1448 1449 #ifdef INET6 1450 int 1451 ipsec6_set_policy(struct in6pcb *in6p, int optname, const void *request, 1452 size_t len, kauth_cred_t cred) 1453 { 1454 struct inpcb_hdr *inph = (struct inpcb_hdr *)in6p; 1455 const struct sadb_x_policy *xpl; 1456 struct secpolicy **policy; 1457 1458 KASSERT(!cpu_softintr_p()); 1459 KASSERT(inph != NULL); 1460 KASSERT(inph_locked(inph)); 1461 KASSERT(request != NULL); 1462 1463 if (len < sizeof(*xpl)) 1464 return EINVAL; 1465 xpl = (const struct sadb_x_policy *)request; 1466 1467 /* select direction */ 1468 switch (xpl->sadb_x_policy_dir) { 1469 case IPSEC_DIR_INBOUND: 1470 policy = &inph->inph_sp->sp_in; 1471 break; 1472 case IPSEC_DIR_OUTBOUND: 1473 policy = &inph->inph_sp->sp_out; 1474 break; 1475 default: 1476 IPSECLOG(LOG_ERR, "invalid direction=%u\n", 1477 xpl->sadb_x_policy_dir); 1478 return EINVAL; 1479 } 1480 1481 return ipsec_set_policy(policy, optname, request, len, cred); 1482 } 1483 1484 int 1485 ipsec6_get_policy(struct in6pcb *in6p, const void *request, size_t len, 1486 struct mbuf **mp) 1487 { 1488 struct inpcb_hdr *inph = (struct inpcb_hdr *)in6p; 1489 const struct sadb_x_policy *xpl; 1490 struct secpolicy *policy; 1491 1492 /* sanity check. */ 1493 if (inph == NULL || request == NULL || mp == NULL) 1494 return EINVAL; 1495 KASSERT(inph->inph_sp != NULL); 1496 if (len < sizeof(*xpl)) 1497 return EINVAL; 1498 xpl = (const struct sadb_x_policy *)request; 1499 1500 /* select direction */ 1501 switch (xpl->sadb_x_policy_dir) { 1502 case IPSEC_DIR_INBOUND: 1503 policy = inph->inph_sp->sp_in; 1504 break; 1505 case IPSEC_DIR_OUTBOUND: 1506 policy = inph->inph_sp->sp_out; 1507 break; 1508 default: 1509 IPSECLOG(LOG_ERR, "invalid direction=%u\n", 1510 xpl->sadb_x_policy_dir); 1511 return EINVAL; 1512 } 1513 1514 return ipsec_get_policy(policy, mp); 1515 } 1516 1517 int 1518 ipsec6_delete_pcbpolicy(struct in6pcb *in6p) 1519 { 1520 struct inpcb_hdr *inph = (struct inpcb_hdr *)in6p; 1521 1522 KASSERT(inph != NULL); 1523 1524 if (inph->inph_sp == NULL) 1525 return 0; 1526 1527 if (inph->inph_sp->sp_in != NULL) 1528 ipsec_destroy_policy(inph->inph_sp->sp_in); 1529 1530 if (inph->inph_sp->sp_out != NULL) 1531 ipsec_destroy_policy(inph->inph_sp->sp_out); 1532 1533 ipsec_invalpcbcache(inph->inph_sp, IPSEC_DIR_ANY); 1534 1535 ipsec_delpcbpolicy(inph->inph_sp); 1536 inph->inph_sp = NULL; 1537 1538 return 0; 1539 } 1540 #endif 1541 1542 /* 1543 * Return the current level (either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE). 1544 */ 1545 u_int 1546 ipsec_get_reqlevel(const struct ipsecrequest *isr) 1547 { 1548 u_int level = 0; 1549 u_int esp_trans_deflev, esp_net_deflev; 1550 u_int ah_trans_deflev, ah_net_deflev; 1551 1552 KASSERT(isr != NULL); 1553 KASSERT(isr->sp != NULL); 1554 KASSERTMSG( 1555 isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1556 "af family mismatch, src %u, dst %u", 1557 isr->sp->spidx.src.sa.sa_family, isr->sp->spidx.dst.sa.sa_family); 1558 1559 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1560 #define IPSEC_CHECK_DEFAULT(lev) \ 1561 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1562 && (lev) != IPSEC_LEVEL_UNIQUE) ? \ 1563 (ipsec_debug ? log(LOG_INFO, "fixed system default level " #lev \ 1564 ":%d->%d\n", (lev), IPSEC_LEVEL_REQUIRE) : (void)0), \ 1565 (lev) = IPSEC_LEVEL_REQUIRE, (lev) \ 1566 : (lev)) 1567 1568 /* set default level */ 1569 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1570 #ifdef INET 1571 case AF_INET: 1572 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1573 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1574 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1575 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1576 break; 1577 #endif 1578 #ifdef INET6 1579 case AF_INET6: 1580 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1581 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1582 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1583 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1584 break; 1585 #endif /* INET6 */ 1586 default: 1587 panic("%s: unknown af %u", __func__, 1588 isr->sp->spidx.src.sa.sa_family); 1589 } 1590 1591 #undef IPSEC_CHECK_DEFAULT 1592 1593 /* set level */ 1594 switch (isr->level) { 1595 case IPSEC_LEVEL_DEFAULT: 1596 switch (isr->saidx.proto) { 1597 case IPPROTO_ESP: 1598 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1599 level = esp_net_deflev; 1600 else 1601 level = esp_trans_deflev; 1602 break; 1603 case IPPROTO_AH: 1604 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1605 level = ah_net_deflev; 1606 else 1607 level = ah_trans_deflev; 1608 break; 1609 case IPPROTO_IPCOMP: 1610 /* 1611 * we don't really care, as IPcomp document says that 1612 * we shouldn't compress small packets 1613 */ 1614 level = IPSEC_LEVEL_USE; 1615 break; 1616 default: 1617 panic("%s: Illegal protocol defined %u", __func__, 1618 isr->saidx.proto); 1619 } 1620 break; 1621 1622 case IPSEC_LEVEL_USE: 1623 case IPSEC_LEVEL_REQUIRE: 1624 level = isr->level; 1625 break; 1626 case IPSEC_LEVEL_UNIQUE: 1627 level = IPSEC_LEVEL_REQUIRE; 1628 break; 1629 1630 default: 1631 panic("%s: Illegal IPsec level %u", __func__, isr->level); 1632 } 1633 1634 return level; 1635 } 1636 1637 /* 1638 * Check security policy requirements against the actual packet contents. 1639 * 1640 * If the SP requires an IPsec packet, and the packet was neither AH nor ESP, 1641 * then kick it. 1642 */ 1643 int 1644 ipsec_sp_reject(const struct secpolicy *sp, const struct mbuf *m) 1645 { 1646 struct ipsecrequest *isr; 1647 1648 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DATA)) { 1649 printf("%s: using SP\n", __func__); 1650 kdebug_secpolicy(sp); 1651 } 1652 1653 /* check policy */ 1654 switch (sp->policy) { 1655 case IPSEC_POLICY_DISCARD: 1656 return 1; 1657 case IPSEC_POLICY_BYPASS: 1658 case IPSEC_POLICY_NONE: 1659 return 0; 1660 } 1661 1662 KASSERTMSG(sp->policy == IPSEC_POLICY_IPSEC, 1663 "invalid policy %u", sp->policy); 1664 1665 /* XXX should compare policy against ipsec header history */ 1666 1667 for (isr = sp->req; isr != NULL; isr = isr->next) { 1668 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1669 continue; 1670 switch (isr->saidx.proto) { 1671 case IPPROTO_ESP: 1672 if ((m->m_flags & M_DECRYPTED) == 0) { 1673 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 1674 "ESP m_flags:%x\n", m->m_flags); 1675 return 1; 1676 } 1677 break; 1678 case IPPROTO_AH: 1679 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1680 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 1681 "AH m_flags:%x\n", m->m_flags); 1682 return 1; 1683 } 1684 break; 1685 case IPPROTO_IPCOMP: 1686 /* 1687 * We don't really care, as IPcomp document 1688 * says that we shouldn't compress small 1689 * packets, IPComp policy should always be 1690 * treated as being in "use" level. 1691 */ 1692 break; 1693 } 1694 } 1695 1696 return 0; 1697 } 1698 1699 /* 1700 * Check security policy requirements. 1701 */ 1702 int 1703 ipsec_in_reject(struct mbuf *m, void *inp) 1704 { 1705 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1706 struct secpolicy *sp; 1707 int error; 1708 int result; 1709 1710 KASSERT(m != NULL); 1711 1712 if (inph == NULL) 1713 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 1714 IP_FORWARDING, &error); 1715 else 1716 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1717 inph, &error); 1718 1719 if (sp != NULL) { 1720 result = ipsec_sp_reject(sp, m); 1721 if (result) 1722 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 1723 KEY_SP_UNREF(&sp); 1724 } else { 1725 result = 0; 1726 } 1727 return result; 1728 } 1729 1730 /* 1731 * Compute the byte size to be occupied by the IPsec header. If it is 1732 * tunneled, it includes the size of outer IP header. 1733 */ 1734 static size_t 1735 ipsec_sp_hdrsiz(const struct secpolicy *sp, const struct mbuf *m) 1736 { 1737 struct ipsecrequest *isr; 1738 size_t siz; 1739 1740 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DATA)) { 1741 printf("%s: using SP\n", __func__); 1742 kdebug_secpolicy(sp); 1743 } 1744 1745 switch (sp->policy) { 1746 case IPSEC_POLICY_DISCARD: 1747 case IPSEC_POLICY_BYPASS: 1748 case IPSEC_POLICY_NONE: 1749 return 0; 1750 } 1751 1752 KASSERTMSG(sp->policy == IPSEC_POLICY_IPSEC, 1753 "invalid policy %u", sp->policy); 1754 1755 siz = 0; 1756 for (isr = sp->req; isr != NULL; isr = isr->next) { 1757 size_t clen = 0; 1758 struct secasvar *sav; 1759 1760 switch (isr->saidx.proto) { 1761 case IPPROTO_ESP: 1762 sav = ipsec_lookup_sa(isr, m); 1763 if (sav != NULL) { 1764 clen = esp_hdrsiz(sav); 1765 KEY_SA_UNREF(&sav); 1766 } else 1767 clen = esp_hdrsiz(NULL); 1768 break; 1769 case IPPROTO_AH: 1770 sav = ipsec_lookup_sa(isr, m); 1771 if (sav != NULL) { 1772 clen = ah_hdrsiz(sav); 1773 KEY_SA_UNREF(&sav); 1774 } else 1775 clen = ah_hdrsiz(NULL); 1776 break; 1777 case IPPROTO_IPCOMP: 1778 clen = sizeof(struct ipcomp); 1779 break; 1780 } 1781 1782 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1783 switch (isr->saidx.dst.sa.sa_family) { 1784 case AF_INET: 1785 clen += sizeof(struct ip); 1786 break; 1787 #ifdef INET6 1788 case AF_INET6: 1789 clen += sizeof(struct ip6_hdr); 1790 break; 1791 #endif 1792 default: 1793 IPSECLOG(LOG_ERR, "unknown AF %d in " 1794 "IPsec tunnel SA\n", 1795 ((const struct sockaddr *)&isr->saidx.dst) 1796 ->sa_family); 1797 break; 1798 } 1799 } 1800 siz += clen; 1801 } 1802 1803 return siz; 1804 } 1805 1806 size_t 1807 ipsec_hdrsiz(struct mbuf *m, u_int dir, void *inp) 1808 { 1809 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1810 struct secpolicy *sp; 1811 int error; 1812 size_t size; 1813 1814 KASSERT(m != NULL); 1815 KASSERTMSG(inph == NULL || inph->inph_socket != NULL, 1816 "socket w/o inpcb"); 1817 1818 if (inph == NULL) 1819 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1820 else 1821 sp = ipsec_getpolicybysock(m, dir, inph, &error); 1822 1823 if (sp != NULL) { 1824 size = ipsec_sp_hdrsiz(sp, m); 1825 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DATA, "size:%zu.\n", size); 1826 KEY_SP_UNREF(&sp); 1827 } else { 1828 size = 0; 1829 } 1830 1831 return size; 1832 } 1833 1834 /* 1835 * Check the variable replay window. 1836 * ipsec_chkreplay() performs replay check before ICV verification. 1837 * ipsec_updatereplay() updates replay bitmap. This must be called after 1838 * ICV verification (it also performs replay check, which is usually done 1839 * beforehand). 1840 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1841 * 1842 * based on RFC 2401. 1843 */ 1844 int 1845 ipsec_chkreplay(u_int32_t seq, const struct secasvar *sav) 1846 { 1847 const struct secreplay *replay; 1848 u_int32_t diff; 1849 int fr; 1850 u_int32_t wsizeb; /* constant: bits of window size */ 1851 int frlast; /* constant: last frame */ 1852 1853 IPSEC_SPLASSERT_SOFTNET(__func__); 1854 1855 KASSERT(sav != NULL); 1856 KASSERT(sav->replay != NULL); 1857 1858 replay = sav->replay; 1859 1860 if (replay->wsize == 0) 1861 return 1; /* no need to check replay. */ 1862 1863 /* constant */ 1864 frlast = replay->wsize - 1; 1865 wsizeb = replay->wsize << 3; 1866 1867 /* sequence number of 0 is invalid */ 1868 if (seq == 0) 1869 return 0; 1870 1871 /* first time is always okay */ 1872 if (replay->count == 0) 1873 return 1; 1874 1875 if (seq > replay->lastseq) { 1876 /* larger sequences are okay */ 1877 return 1; 1878 } else { 1879 /* seq is equal or less than lastseq. */ 1880 diff = replay->lastseq - seq; 1881 1882 /* over range to check, i.e. too old or wrapped */ 1883 if (diff >= wsizeb) 1884 return 0; 1885 1886 fr = frlast - diff / 8; 1887 1888 /* this packet already seen ? */ 1889 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1890 return 0; 1891 1892 /* out of order but good */ 1893 return 1; 1894 } 1895 } 1896 1897 /* 1898 * check replay counter whether to update or not. 1899 * OUT: 0: OK 1900 * 1: NG 1901 */ 1902 int 1903 ipsec_updatereplay(u_int32_t seq, const struct secasvar *sav) 1904 { 1905 struct secreplay *replay; 1906 u_int32_t diff; 1907 int fr; 1908 u_int32_t wsizeb; /* constant: bits of window size */ 1909 int frlast; /* constant: last frame */ 1910 1911 IPSEC_SPLASSERT_SOFTNET(__func__); 1912 1913 KASSERT(sav != NULL); 1914 KASSERT(sav->replay != NULL); 1915 1916 replay = sav->replay; 1917 1918 if (replay->wsize == 0) 1919 goto ok; /* no need to check replay. */ 1920 1921 /* constant */ 1922 frlast = replay->wsize - 1; 1923 wsizeb = replay->wsize << 3; 1924 1925 /* sequence number of 0 is invalid */ 1926 if (seq == 0) 1927 return 1; 1928 1929 /* first time */ 1930 if (replay->count == 0) { 1931 replay->lastseq = seq; 1932 memset(replay->bitmap, 0, replay->wsize); 1933 (replay->bitmap)[frlast] = 1; 1934 goto ok; 1935 } 1936 1937 if (seq > replay->lastseq) { 1938 /* seq is larger than lastseq. */ 1939 diff = seq - replay->lastseq; 1940 1941 /* new larger sequence number */ 1942 if (diff < wsizeb) { 1943 /* In window */ 1944 /* set bit for this packet */ 1945 vshiftl(replay->bitmap, diff, replay->wsize); 1946 (replay->bitmap)[frlast] |= 1; 1947 } else { 1948 /* this packet has a "way larger" */ 1949 memset(replay->bitmap, 0, replay->wsize); 1950 (replay->bitmap)[frlast] = 1; 1951 } 1952 replay->lastseq = seq; 1953 1954 /* larger is good */ 1955 } else { 1956 /* seq is equal or less than lastseq. */ 1957 diff = replay->lastseq - seq; 1958 1959 /* over range to check, i.e. too old or wrapped */ 1960 if (diff >= wsizeb) 1961 return 1; 1962 1963 fr = frlast - diff / 8; 1964 1965 /* this packet already seen ? */ 1966 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1967 return 1; 1968 1969 /* mark as seen */ 1970 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1971 1972 /* out of order but good */ 1973 } 1974 1975 ok: 1976 if (replay->count == ~0) { 1977 char buf[IPSEC_LOGSASTRLEN]; 1978 1979 /* set overflow flag */ 1980 replay->overflow++; 1981 1982 /* don't increment, no more packets accepted */ 1983 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1984 return 1; 1985 1986 IPSECLOG(LOG_WARNING, "replay counter made %d cycle. %s\n", 1987 replay->overflow, ipsec_logsastr(sav, buf, sizeof(buf))); 1988 } 1989 1990 replay->count++; 1991 1992 return 0; 1993 } 1994 1995 /* 1996 * shift variable length buffer to left. 1997 * IN: bitmap: pointer to the buffer 1998 * nbit: the number of to shift. 1999 * wsize: buffer size (bytes). 2000 */ 2001 static void 2002 vshiftl(unsigned char *bitmap, int nbit, int wsize) 2003 { 2004 int s, j, i; 2005 unsigned char over; 2006 2007 for (j = 0; j < nbit; j += 8) { 2008 s = (nbit - j < 8) ? (nbit - j): 8; 2009 bitmap[0] <<= s; 2010 for (i = 1; i < wsize; i++) { 2011 over = (bitmap[i] >> (8 - s)); 2012 bitmap[i] <<= s; 2013 bitmap[i-1] |= over; 2014 } 2015 } 2016 2017 return; 2018 } 2019 2020 /* Return a printable string for the address. */ 2021 const char * 2022 ipsec_address(const union sockaddr_union *sa, char *buf, size_t size) 2023 { 2024 switch (sa->sa.sa_family) { 2025 #if INET 2026 case AF_INET: 2027 in_print(buf, size, &sa->sin.sin_addr); 2028 return buf; 2029 #endif 2030 #if INET6 2031 case AF_INET6: 2032 in6_print(buf, size, &sa->sin6.sin6_addr); 2033 return buf; 2034 #endif 2035 default: 2036 return "(unknown address family)"; 2037 } 2038 } 2039 2040 const char * 2041 ipsec_logsastr(const struct secasvar *sav, char *buf, size_t size) 2042 { 2043 const struct secasindex *saidx = &sav->sah->saidx; 2044 char sbuf[IPSEC_ADDRSTRLEN], dbuf[IPSEC_ADDRSTRLEN]; 2045 2046 KASSERTMSG(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2047 "af family mismatch, src %u, dst %u", 2048 saidx->src.sa.sa_family, saidx->dst.sa.sa_family); 2049 2050 snprintf(buf, size, "SA(SPI=%u src=%s dst=%s)", 2051 (u_int32_t)ntohl(sav->spi), 2052 ipsec_address(&saidx->src, sbuf, sizeof(sbuf)), 2053 ipsec_address(&saidx->dst, dbuf, sizeof(dbuf))); 2054 2055 return buf; 2056 } 2057 2058 void 2059 ipsec_dumpmbuf(struct mbuf *m) 2060 { 2061 int totlen; 2062 int i; 2063 u_char *p; 2064 2065 totlen = 0; 2066 printf("---\n"); 2067 while (m) { 2068 p = mtod(m, u_char *); 2069 for (i = 0; i < m->m_len; i++) { 2070 printf("%02x ", p[i]); 2071 totlen++; 2072 if (totlen % 16 == 0) 2073 printf("\n"); 2074 } 2075 m = m->m_next; 2076 } 2077 if (totlen % 16 != 0) 2078 printf("\n"); 2079 printf("---\n"); 2080 } 2081 2082 #ifdef INET6 2083 struct secpolicy * 2084 ipsec6_check_policy(struct mbuf *m, struct in6pcb *in6p, int flags, 2085 int *needipsecp, int *errorp) 2086 { 2087 struct secpolicy *sp = NULL; 2088 int s; 2089 int error = 0; 2090 int needipsec = 0; 2091 2092 if (!ipsec_outdone(m)) { 2093 s = splsoftnet(); 2094 if (in6p != NULL && 2095 ipsec_pcb_skip_ipsec(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) { 2096 splx(s); 2097 goto skippolicycheck; 2098 } 2099 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, 2100 in6p); 2101 2102 /* 2103 * There are four return cases: 2104 * sp != NULL apply IPsec policy 2105 * sp == NULL, error == 0 no IPsec handling needed 2106 * sp == NULL, error == -EINVAL discard packet w/o error 2107 * sp == NULL, error != 0 discard packet, report error 2108 */ 2109 2110 splx(s); 2111 if (sp == NULL) { 2112 /* 2113 * Caller must check the error return to see if it needs to discard 2114 * the packet. 2115 */ 2116 needipsec = 0; 2117 } else { 2118 needipsec = 1; 2119 } 2120 } 2121 skippolicycheck:; 2122 2123 *errorp = error; 2124 *needipsecp = needipsec; 2125 return sp; 2126 } 2127 2128 int 2129 ipsec6_input(struct mbuf *m) 2130 { 2131 int s, error; 2132 2133 s = splsoftnet(); 2134 error = ipsec_in_reject(m, NULL); 2135 splx(s); 2136 if (error) { 2137 return EINVAL; 2138 } 2139 2140 return 0; 2141 } 2142 #endif /* INET6 */ 2143 2144 /* 2145 * ----------------------------------------------------------------------------- 2146 */ 2147 2148 /* XXX this stuff doesn't belong here... */ 2149 2150 static struct xformsw *xforms = NULL; 2151 2152 /* 2153 * Register a transform; typically at system startup. 2154 */ 2155 void 2156 xform_register(struct xformsw *xsp) 2157 { 2158 xsp->xf_next = xforms; 2159 xforms = xsp; 2160 } 2161 2162 /* 2163 * Initialize transform support in an sav. 2164 */ 2165 int 2166 xform_init(struct secasvar *sav, int xftype) 2167 { 2168 struct xformsw *xsp; 2169 2170 if (sav->tdb_xform != NULL) /* previously initialized */ 2171 return 0; 2172 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2173 if (xsp->xf_type == xftype) 2174 return (*xsp->xf_init)(sav, xsp); 2175 2176 IPSECLOG(LOG_DEBUG, "no match for xform type %d\n", xftype); 2177 return EINVAL; 2178 } 2179 2180 void 2181 nat_t_ports_get(struct mbuf *m, u_int16_t *dport, u_int16_t *sport) 2182 { 2183 struct m_tag *tag; 2184 2185 if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL))) { 2186 *sport = ((u_int16_t *)(tag + 1))[0]; 2187 *dport = ((u_int16_t *)(tag + 1))[1]; 2188 } else 2189 *sport = *dport = 0; 2190 } 2191 2192 /* 2193 * XXXJRT This should be done as a protosw init call. 2194 */ 2195 void 2196 ipsec_attach(void) 2197 { 2198 2199 ipsec_output_init(); 2200 2201 ipsecstat_percpu = percpu_alloc(sizeof(uint64_t) * IPSEC_NSTATS); 2202 2203 sysctl_net_inet_ipsec_setup(NULL); 2204 #ifdef INET6 2205 sysctl_net_inet6_ipsec6_setup(NULL); 2206 #endif 2207 2208 ah_attach(); 2209 esp_attach(); 2210 ipcomp_attach(); 2211 ipe4_attach(); 2212 #ifdef TCP_SIGNATURE 2213 tcpsignature_attach(); 2214 #endif 2215 } 2216
Indexes created Tue Sep 23 21:09:50 GMT 2025