isakmp_inf.c revision 1.23
1/* $NetBSD: isakmp_inf.c,v 1.23 2008/01/11 14:08:29 vanhu Exp $ */ 2 3/* Id: isakmp_inf.c,v 1.44 2006/05/06 20:45:52 manubsd 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 "config.h" 35 36#include <sys/types.h> 37#include <sys/param.h> 38#include <sys/socket.h> 39 40#include <net/pfkeyv2.h> 41#include <netinet/in.h> 42#include <sys/queue.h> 43#include PATH_IPSEC_H 44 45#include <stdlib.h> 46#include <stdio.h> 47#include <string.h> 48#include <errno.h> 49#if TIME_WITH_SYS_TIME 50# include <sys/time.h> 51# include <time.h> 52#else 53# if HAVE_SYS_TIME_H 54# include <sys/time.h> 55# else 56# include <time.h> 57# endif 58#endif 59#ifdef ENABLE_HYBRID 60#include <resolv.h> 61#endif 62 63#include "libpfkey.h" 64 65#include "var.h" 66#include "vmbuf.h" 67#include "schedule.h" 68#include "str2val.h" 69#include "misc.h" 70#include "plog.h" 71#include "debug.h" 72 73#include "localconf.h" 74#include "remoteconf.h" 75#include "sockmisc.h" 76#include "handler.h" 77#include "policy.h" 78#include "proposal.h" 79#include "isakmp_var.h" 80#include "evt.h" 81#include "isakmp.h" 82#ifdef ENABLE_HYBRID 83#include "isakmp_xauth.h" 84#include "isakmp_unity.h" 85#include "isakmp_cfg.h" 86#endif 87#include "isakmp_inf.h" 88#include "oakley.h" 89#include "ipsec_doi.h" 90#include "crypto_openssl.h" 91#include "pfkey.h" 92#include "policy.h" 93#include "algorithm.h" 94#include "proposal.h" 95#include "admin.h" 96#include "strnames.h" 97#ifdef ENABLE_NATT 98#include "nattraversal.h" 99#endif 100 101/* information exchange */ 102static int isakmp_info_recv_n (struct ph1handle *, struct isakmp_pl_n *, u_int32_t, int); 103static int isakmp_info_recv_d (struct ph1handle *, struct isakmp_pl_d *, u_int32_t, int); 104 105#ifdef ENABLE_DPD 106static int isakmp_info_recv_r_u __P((struct ph1handle *, 107 struct isakmp_pl_ru *, u_int32_t)); 108static int isakmp_info_recv_r_u_ack __P((struct ph1handle *, 109 struct isakmp_pl_ru *, u_int32_t)); 110static void isakmp_info_send_r_u __P((void *)); 111#endif 112 113static void purge_isakmp_spi __P((int, isakmp_index *, size_t)); 114static void info_recv_initialcontact __P((struct ph1handle *)); 115 116/* %%% 117 * Information Exchange 118 */ 119/* 120 * receive Information 121 */ 122int 123isakmp_info_recv(iph1, msg0) 124 struct ph1handle *iph1; 125 vchar_t *msg0; 126{ 127 vchar_t *msg = NULL; 128 vchar_t *pbuf = NULL; 129 u_int32_t msgid = 0; 130 int error = -1; 131 struct isakmp *isakmp; 132 struct isakmp_gen *gen; 133 struct isakmp_parse_t *pa, *pap; 134 void *p; 135 vchar_t *hash, *payload; 136 struct isakmp_gen *nd; 137 u_int8_t np; 138 int encrypted; 139 int flag; 140 141 plog(LLV_DEBUG, LOCATION, NULL, "receive Information.\n"); 142 143 encrypted = ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E); 144 msgid = ((struct isakmp *)msg0->v)->msgid; 145 146 /* Use new IV to decrypt Informational message. */ 147 if (encrypted) { 148 struct isakmp_ivm *ivm; 149 150 if (iph1->ivm == NULL) { 151 plog(LLV_ERROR, LOCATION, NULL, "iph1->ivm == NULL\n"); 152 return -1; 153 } 154 155 /* compute IV */ 156 ivm = oakley_newiv2(iph1, ((struct isakmp *)msg0->v)->msgid); 157 if (ivm == NULL) 158 return -1; 159 160 msg = oakley_do_decrypt(iph1, msg0, ivm->iv, ivm->ive); 161 oakley_delivm(ivm); 162 if (msg == NULL) 163 return -1; 164 165 } else 166 msg = vdup(msg0); 167 168 /* Safety check */ 169 if (msg->l < sizeof(*isakmp) + sizeof(*gen)) { 170 plog(LLV_ERROR, LOCATION, NULL, 171 "ignore information because the " 172 "message is way too short - %d byte(s).\n", msg->l); 173 goto end; 174 } 175 176 isakmp = (struct isakmp *)msg->v; 177 gen = (struct isakmp_gen *)((caddr_t)isakmp + sizeof(struct isakmp)); 178 np = gen->np; 179 180 if (encrypted) { 181 if (isakmp->np != ISAKMP_NPTYPE_HASH) { 182 plog(LLV_ERROR, LOCATION, NULL, 183 "ignore information because the" 184 "message has no hash payload.\n"); 185 goto end; 186 } 187 188 if (iph1->status != PHASE1ST_ESTABLISHED) { 189 plog(LLV_ERROR, LOCATION, NULL, 190 "ignore information because ISAKMP-SA" 191 "has not been established yet.\n"); 192 goto end; 193 } 194 195 /* Safety check */ 196 if (msg->l < sizeof(*isakmp) + ntohs(gen->len) + sizeof(*nd)) { 197 plog(LLV_ERROR, LOCATION, NULL, 198 "ignore information because the " 199 "message is too short - %d byte(s).\n", msg->l); 200 goto end; 201 } 202 203 p = (caddr_t) gen + sizeof(struct isakmp_gen); 204 nd = (struct isakmp_gen *) ((caddr_t) gen + ntohs(gen->len)); 205 206 /* nd length check */ 207 if (ntohs(nd->len) > msg->l - (sizeof(struct isakmp) + 208 ntohs(gen->len))) { 209 plog(LLV_ERROR, LOCATION, NULL, 210 "too long payload length (broken message?)\n"); 211 goto end; 212 } 213 214 if (ntohs(nd->len) < sizeof(*nd)) { 215 plog(LLV_ERROR, LOCATION, NULL, 216 "too short payload length (broken message?)\n"); 217 goto end; 218 } 219 220 payload = vmalloc(ntohs(nd->len)); 221 if (payload == NULL) { 222 plog(LLV_ERROR, LOCATION, NULL, 223 "cannot allocate memory\n"); 224 goto end; 225 } 226 227 memcpy(payload->v, (caddr_t) nd, ntohs(nd->len)); 228 229 /* compute HASH */ 230 hash = oakley_compute_hash1(iph1, isakmp->msgid, payload); 231 if (hash == NULL) { 232 plog(LLV_ERROR, LOCATION, NULL, 233 "cannot compute hash\n"); 234 235 vfree(payload); 236 goto end; 237 } 238 239 if (ntohs(gen->len) - sizeof(struct isakmp_gen) != hash->l) { 240 plog(LLV_ERROR, LOCATION, NULL, 241 "ignore information due to hash length mismatch\n"); 242 243 vfree(hash); 244 vfree(payload); 245 goto end; 246 } 247 248 if (memcmp(p, hash->v, hash->l) != 0) { 249 plog(LLV_ERROR, LOCATION, NULL, 250 "ignore information due to hash mismatch\n"); 251 252 vfree(hash); 253 vfree(payload); 254 goto end; 255 } 256 257 plog(LLV_DEBUG, LOCATION, NULL, "hash validated.\n"); 258 259 vfree(hash); 260 vfree(payload); 261 } else { 262 /* make sure the packet was encrypted after the beginning of phase 1. */ 263 switch (iph1->etype) { 264 case ISAKMP_ETYPE_AGG: 265 case ISAKMP_ETYPE_BASE: 266 case ISAKMP_ETYPE_IDENT: 267 if ((iph1->side == INITIATOR && iph1->status < PHASE1ST_MSG3SENT) 268 || (iph1->side == RESPONDER && iph1->status < PHASE1ST_MSG2SENT)) { 269 break; 270 } 271 /*FALLTHRU*/ 272 default: 273 plog(LLV_ERROR, LOCATION, iph1->remote, 274 "%s message must be encrypted\n", 275 s_isakmp_nptype(np)); 276 error = 0; 277 goto end; 278 } 279 } 280 281 if (!(pbuf = isakmp_parse(msg))) { 282 error = -1; 283 goto end; 284 } 285 286 error = 0; 287 for (pa = (struct isakmp_parse_t *)pbuf->v; pa->type; pa++) { 288 switch (pa->type) { 289 case ISAKMP_NPTYPE_HASH: 290 /* Handled above */ 291 break; 292 case ISAKMP_NPTYPE_N: 293 error = isakmp_info_recv_n(iph1, 294 (struct isakmp_pl_n *)pa->ptr, 295 msgid, encrypted); 296 break; 297 case ISAKMP_NPTYPE_D: 298 error = isakmp_info_recv_d(iph1, 299 (struct isakmp_pl_d *)pa->ptr, 300 msgid, encrypted); 301 break; 302 case ISAKMP_NPTYPE_NONCE: 303 /* XXX to be 6.4.2 ike-01.txt */ 304 /* XXX IV is to be synchronized. */ 305 plog(LLV_ERROR, LOCATION, iph1->remote, 306 "ignore Acknowledged Informational\n"); 307 break; 308 default: 309 /* don't send information, see isakmp_ident_r1() */ 310 error = 0; 311 plog(LLV_ERROR, LOCATION, iph1->remote, 312 "reject the packet, " 313 "received unexpected payload type %s.\n", 314 s_isakmp_nptype(gen->np)); 315 } 316 if(error < 0) { 317 break; 318 } else { 319 flag |= error; 320 } 321 } 322 end: 323 if (msg != NULL) 324 vfree(msg); 325 if (pbuf != NULL) 326 vfree(pbuf); 327 return error; 328} 329 330/* 331 * handling of Notification payload 332 */ 333static int 334isakmp_info_recv_n(iph1, notify, msgid, encrypted) 335 struct ph1handle *iph1; 336 struct isakmp_pl_n *notify; 337 u_int32_t msgid; 338 int encrypted; 339{ 340 u_int type; 341 vchar_t *pbuf; 342 vchar_t *ndata; 343 char *nraw; 344 size_t l; 345 char *spi; 346 347 type = ntohs(notify->type); 348 349 switch (type) { 350 case ISAKMP_NTYPE_CONNECTED: 351 case ISAKMP_NTYPE_RESPONDER_LIFETIME: 352 case ISAKMP_NTYPE_REPLAY_STATUS: 353#ifdef ENABLE_HYBRID 354 case ISAKMP_NTYPE_UNITY_HEARTBEAT: 355#endif 356 /* do something */ 357 break; 358 case ISAKMP_NTYPE_INITIAL_CONTACT: 359 if (encrypted) 360 info_recv_initialcontact(iph1); 361 return 0; 362 break; 363#ifdef ENABLE_DPD 364 case ISAKMP_NTYPE_R_U_THERE: 365 if (encrypted) 366 return isakmp_info_recv_r_u(iph1, 367 (struct isakmp_pl_ru *)notify, msgid); 368 break; 369 case ISAKMP_NTYPE_R_U_THERE_ACK: 370 if (encrypted) 371 return isakmp_info_recv_r_u_ack(iph1, 372 (struct isakmp_pl_ru *)notify, msgid); 373 break; 374#endif 375 default: 376 { 377 /* XXX there is a potential of dos attack. */ 378 if(type >= ISAKMP_NTYPE_MINERROR && 379 type <= ISAKMP_NTYPE_MAXERROR) { 380 if (msgid == 0) { 381 /* don't think this realy deletes ph1 ? */ 382 plog(LLV_ERROR, LOCATION, iph1->remote, 383 "delete phase1 handle.\n"); 384 return -1; 385 } else { 386 if (getph2bymsgid(iph1, msgid) == NULL) { 387 plog(LLV_ERROR, LOCATION, iph1->remote, 388 "fatal %s notify messsage, " 389 "phase1 should be deleted.\n", 390 s_isakmp_notify_msg(type)); 391 } else { 392 plog(LLV_ERROR, LOCATION, iph1->remote, 393 "fatal %s notify messsage, " 394 "phase2 should be deleted.\n", 395 s_isakmp_notify_msg(type)); 396 } 397 } 398 } else { 399 plog(LLV_ERROR, LOCATION, iph1->remote, 400 "unhandled notify message %s, " 401 "no phase2 handle found.\n", 402 s_isakmp_notify_msg(type)); 403 } 404 } 405 break; 406 } 407 408 /* get spi if specified and allocate */ 409 if(notify->spi_size > 0) { 410 if (ntohs(notify->h.len) < sizeof(*notify) + notify->spi_size) { 411 plog(LLV_ERROR, LOCATION, iph1->remote, 412 "invalid spi_size in notification payload.\n"); 413 return -1; 414 } 415 spi = val2str((char *)(notify + 1), notify->spi_size); 416 417 plog(LLV_DEBUG, LOCATION, iph1->remote, 418 "notification message %d:%s, " 419 "doi=%d proto_id=%d spi=%s(size=%d).\n", 420 type, s_isakmp_notify_msg(type), 421 ntohl(notify->doi), notify->proto_id, spi, notify->spi_size); 422 423 racoon_free(spi); 424 } 425 426 /* Send the message data to the logs */ 427 if(type >= ISAKMP_NTYPE_MINERROR && 428 type <= ISAKMP_NTYPE_MAXERROR) { 429 l = ntohs(notify->h.len) - sizeof(*notify) - notify->spi_size; 430 if (l > 0) { 431 nraw = (char*)notify; 432 nraw += sizeof(*notify) + notify->spi_size; 433 if ((ndata = vmalloc(l)) != NULL) { 434 memcpy(ndata->v, nraw, ndata->l); 435 plog(LLV_ERROR, LOCATION, iph1->remote, 436 "Message: '%s'.\n", 437 binsanitize(ndata->v, ndata->l)); 438 vfree(ndata); 439 } else { 440 plog(LLV_ERROR, LOCATION, iph1->remote, 441 "Cannot allocate memory\n"); 442 } 443 } 444 } 445 return 0; 446} 447 448/* 449 * handling of Deletion payload 450 */ 451static int 452isakmp_info_recv_d(iph1, delete, msgid, encrypted) 453 struct ph1handle *iph1; 454 struct isakmp_pl_d *delete; 455 u_int32_t msgid; 456 int encrypted; 457{ 458 int tlen, num_spi; 459 vchar_t *pbuf; 460 int protected = 0; 461 struct ph1handle *del_ph1; 462 struct ph2handle *iph2; 463 union { 464 u_int32_t spi32; 465 u_int16_t spi16[2]; 466 } spi; 467 468 if (ntohl(delete->doi) != IPSEC_DOI) { 469 plog(LLV_ERROR, LOCATION, iph1->remote, 470 "delete payload with invalid doi:%d.\n", 471 ntohl(delete->doi)); 472#ifdef ENABLE_HYBRID 473 /* 474 * At deconnexion time, Cisco VPN client does this 475 * with a zero DOI. Don't give up in that situation. 476 */ 477 if (((iph1->mode_cfg->flags & 478 ISAKMP_CFG_VENDORID_UNITY) == 0) || (delete->doi != 0)) 479 return 0; 480#else 481 return 0; 482#endif 483 } 484 485 num_spi = ntohs(delete->num_spi); 486 tlen = ntohs(delete->h.len) - sizeof(struct isakmp_pl_d); 487 488 if (tlen != num_spi * delete->spi_size) { 489 plog(LLV_ERROR, LOCATION, iph1->remote, 490 "deletion payload with invalid length.\n"); 491 return 0; 492 } 493 494 plog(LLV_DEBUG, LOCATION, iph1->remote, 495 "delete payload for protocol %s\n", 496 s_ipsecdoi_proto(delete->proto_id)); 497 498 if(!iph1->rmconf->weak_phase1_check && !encrypted) { 499 plog(LLV_WARNING, LOCATION, iph1->remote, 500 "Ignoring unencrypted delete payload " 501 "(check the weak_phase1_check option)\n"); 502 return 0; 503 } 504 505 switch (delete->proto_id) { 506 case IPSECDOI_PROTO_ISAKMP: 507 if (delete->spi_size != sizeof(isakmp_index)) { 508 plog(LLV_ERROR, LOCATION, iph1->remote, 509 "delete payload with strange spi " 510 "size %d(proto_id:%d)\n", 511 delete->spi_size, delete->proto_id); 512 return 0; 513 } 514 515 del_ph1=getph1byindex((isakmp_index *)(delete + 1)); 516 if(del_ph1 != NULL){ 517 518 EVT_PUSH(del_ph1->local, del_ph1->remote, 519 EVTT_PEERPH1_NOPROP, NULL); 520 SCHED_KILL(del_ph1->scr); 521 522 /* 523 * Do not delete IPsec SAs when receiving an IKE delete notification. 524 * Just delete the IKE SA. 525 */ 526 isakmp_ph1expire(del_ph1); 527 } 528 break; 529 530 case IPSECDOI_PROTO_IPSEC_AH: 531 case IPSECDOI_PROTO_IPSEC_ESP: 532 if (delete->spi_size != sizeof(u_int32_t)) { 533 plog(LLV_ERROR, LOCATION, iph1->remote, 534 "delete payload with strange spi " 535 "size %d(proto_id:%d)\n", 536 delete->spi_size, delete->proto_id); 537 return 0; 538 } 539 EVT_PUSH(iph1->local, iph1->remote, 540 EVTT_PEER_DELETE, NULL); 541 purge_ipsec_spi(iph1->remote, delete->proto_id, 542 (u_int32_t *)(delete + 1), num_spi); 543 break; 544 545 case IPSECDOI_PROTO_IPCOMP: 546 /* need to handle both 16bit/32bit SPI */ 547 memset(&spi, 0, sizeof(spi)); 548 if (delete->spi_size == sizeof(spi.spi16[1])) { 549 memcpy(&spi.spi16[1], delete + 1, 550 sizeof(spi.spi16[1])); 551 } else if (delete->spi_size == sizeof(spi.spi32)) 552 memcpy(&spi.spi32, delete + 1, sizeof(spi.spi32)); 553 else { 554 plog(LLV_ERROR, LOCATION, iph1->remote, 555 "delete payload with strange spi " 556 "size %d(proto_id:%d)\n", 557 delete->spi_size, delete->proto_id); 558 return 0; 559 } 560 purge_ipsec_spi(iph1->remote, delete->proto_id, 561 &spi.spi32, num_spi); 562 break; 563 564 default: 565 plog(LLV_ERROR, LOCATION, iph1->remote, 566 "deletion message received, " 567 "invalid proto_id: %d\n", 568 delete->proto_id); 569 return 0; 570 } 571 572 plog(LLV_DEBUG, LOCATION, NULL, "purged SAs.\n"); 573 574 return 0; 575} 576 577/* 578 * send Delete payload (for ISAKMP SA) in Informational exchange. 579 */ 580int 581isakmp_info_send_d1(iph1) 582 struct ph1handle *iph1; 583{ 584 struct isakmp_pl_d *d; 585 vchar_t *payload = NULL; 586 int tlen; 587 int error = 0; 588 589 if (iph1->status != PHASE2ST_ESTABLISHED) 590 return 0; 591 592 /* create delete payload */ 593 594 /* send SPIs of inbound SAs. */ 595 /* XXX should send outbound SAs's ? */ 596 tlen = sizeof(*d) + sizeof(isakmp_index); 597 payload = vmalloc(tlen); 598 if (payload == NULL) { 599 plog(LLV_ERROR, LOCATION, NULL, 600 "failed to get buffer for payload.\n"); 601 return errno; 602 } 603 604 d = (struct isakmp_pl_d *)payload->v; 605 d->h.np = ISAKMP_NPTYPE_NONE; 606 d->h.len = htons(tlen); 607 d->doi = htonl(IPSEC_DOI); 608 d->proto_id = IPSECDOI_PROTO_ISAKMP; 609 d->spi_size = sizeof(isakmp_index); 610 d->num_spi = htons(1); 611 memcpy(d + 1, &iph1->index, sizeof(isakmp_index)); 612 613 error = isakmp_info_send_common(iph1, payload, 614 ISAKMP_NPTYPE_D, 0); 615 vfree(payload); 616 617 return error; 618} 619 620/* 621 * send Delete payload (for IPsec SA) in Informational exchange, based on 622 * pfkey msg. It sends always single SPI. 623 */ 624int 625isakmp_info_send_d2(iph2) 626 struct ph2handle *iph2; 627{ 628 struct ph1handle *iph1; 629 struct saproto *pr; 630 struct isakmp_pl_d *d; 631 vchar_t *payload = NULL; 632 int tlen; 633 int error = 0; 634 u_int8_t *spi; 635 636 if (iph2->status != PHASE2ST_ESTABLISHED) 637 return 0; 638 639 /* 640 * don't send delete information if there is no phase 1 handler. 641 * It's nonsensical to negotiate phase 1 to send the information. 642 */ 643 iph1 = getph1byaddr(iph2->src, iph2->dst, 0); 644 if (iph1 == NULL){ 645 plog(LLV_DEBUG2, LOCATION, NULL, 646 "No ph1 handler found, could not send DELETE_SA\n"); 647 return 0; 648 } 649 650 /* create delete payload */ 651 for (pr = iph2->approval->head; pr != NULL; pr = pr->next) { 652 653 /* send SPIs of inbound SAs. */ 654 /* 655 * XXX should I send outbound SAs's ? 656 * I send inbound SAs's SPI only at the moment because I can't 657 * decode any more if peer send encoded packet without aware of 658 * deletion of SA. Outbound SAs don't come under the situation. 659 */ 660 tlen = sizeof(*d) + pr->spisize; 661 payload = vmalloc(tlen); 662 if (payload == NULL) { 663 plog(LLV_ERROR, LOCATION, NULL, 664 "failed to get buffer for payload.\n"); 665 return errno; 666 } 667 668 d = (struct isakmp_pl_d *)payload->v; 669 d->h.np = ISAKMP_NPTYPE_NONE; 670 d->h.len = htons(tlen); 671 d->doi = htonl(IPSEC_DOI); 672 d->proto_id = pr->proto_id; 673 d->spi_size = pr->spisize; 674 d->num_spi = htons(1); 675 /* 676 * XXX SPI bits are left-filled, for use with IPComp. 677 * we should be switching to variable-length spi field... 678 */ 679 spi = (u_int8_t *)&pr->spi; 680 spi += sizeof(pr->spi); 681 spi -= pr->spisize; 682 memcpy(d + 1, spi, pr->spisize); 683 684 error = isakmp_info_send_common(iph1, payload, 685 ISAKMP_NPTYPE_D, 0); 686 vfree(payload); 687 } 688 689 return error; 690} 691 692/* 693 * send Notification payload (for without ISAKMP SA) in Informational exchange 694 */ 695int 696isakmp_info_send_nx(isakmp, remote, local, type, data) 697 struct isakmp *isakmp; 698 struct sockaddr *remote, *local; 699 int type; 700 vchar_t *data; 701{ 702 struct ph1handle *iph1 = NULL; 703 struct remoteconf *rmconf; 704 vchar_t *payload = NULL; 705 int tlen; 706 int error = -1; 707 struct isakmp_pl_n *n; 708 int spisiz = 0; /* see below */ 709 710 /* search appropreate configuration */ 711 rmconf = getrmconf(remote); 712 if (rmconf == NULL) { 713 plog(LLV_ERROR, LOCATION, remote, 714 "no configuration found for peer address.\n"); 715 goto end; 716 } 717 718 /* add new entry to isakmp status table. */ 719 iph1 = newph1(); 720 if (iph1 == NULL) 721 return -1; 722 723 memcpy(&iph1->index.i_ck, &isakmp->i_ck, sizeof(cookie_t)); 724 isakmp_newcookie((char *)&iph1->index.r_ck, remote, local); 725 iph1->status = PHASE1ST_START; 726 iph1->rmconf = rmconf; 727 iph1->side = INITIATOR; 728 iph1->version = isakmp->v; 729 iph1->flags = 0; 730 iph1->msgid = 0; /* XXX */ 731#ifdef ENABLE_HYBRID 732 if ((iph1->mode_cfg = isakmp_cfg_mkstate()) == NULL) { 733 error = -1; 734 goto end; 735 } 736#endif 737#ifdef ENABLE_FRAG 738 iph1->frag = 0; 739 iph1->frag_chain = NULL; 740#endif 741 742 /* copy remote address */ 743 if (copy_ph1addresses(iph1, rmconf, remote, local) < 0) { 744 error = -1; 745 goto end; 746 } 747 748 tlen = sizeof(*n) + spisiz; 749 if (data) 750 tlen += data->l; 751 payload = vmalloc(tlen); 752 if (payload == NULL) { 753 plog(LLV_ERROR, LOCATION, NULL, 754 "failed to get buffer to send.\n"); 755 error = -1; 756 goto end; 757 } 758 759 n = (struct isakmp_pl_n *)payload->v; 760 n->h.np = ISAKMP_NPTYPE_NONE; 761 n->h.len = htons(tlen); 762 n->doi = htonl(IPSEC_DOI); 763 n->proto_id = IPSECDOI_KEY_IKE; 764 n->spi_size = spisiz; 765 n->type = htons(type); 766 if (spisiz) 767 memset(n + 1, 0, spisiz); /* XXX spisiz is always 0 */ 768 if (data) 769 memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l); 770 771 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0); 772 vfree(payload); 773 774 end: 775 if (iph1 != NULL) 776 delph1(iph1); 777 778 return error; 779} 780 781/* 782 * send Notification payload (for ISAKMP SA) in Informational exchange 783 */ 784int 785isakmp_info_send_n1(iph1, type, data) 786 struct ph1handle *iph1; 787 int type; 788 vchar_t *data; 789{ 790 vchar_t *payload = NULL; 791 int tlen; 792 int error = 0; 793 struct isakmp_pl_n *n; 794 int spisiz; 795 796 /* 797 * note on SPI size: which description is correct? I have chosen 798 * this to be 0. 799 * 800 * RFC2408 3.1, 2nd paragraph says: ISAKMP SA is identified by 801 * Initiator/Responder cookie and SPI has no meaning, SPI size = 0. 802 * RFC2408 3.1, first paragraph on page 40: ISAKMP SA is identified 803 * by cookie and SPI has no meaning, 0 <= SPI size <= 16. 804 * RFC2407 4.6.3.3, INITIAL-CONTACT is required to set to 16. 805 */ 806 if (type == ISAKMP_NTYPE_INITIAL_CONTACT) 807 spisiz = sizeof(isakmp_index); 808 else 809 spisiz = 0; 810 811 tlen = sizeof(*n) + spisiz; 812 if (data) 813 tlen += data->l; 814 payload = vmalloc(tlen); 815 if (payload == NULL) { 816 plog(LLV_ERROR, LOCATION, NULL, 817 "failed to get buffer to send.\n"); 818 return errno; 819 } 820 821 n = (struct isakmp_pl_n *)payload->v; 822 n->h.np = ISAKMP_NPTYPE_NONE; 823 n->h.len = htons(tlen); 824 n->doi = htonl(iph1->rmconf->doitype); 825 n->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX to be configurable ? */ 826 n->spi_size = spisiz; 827 n->type = htons(type); 828 if (spisiz) 829 memcpy(n + 1, &iph1->index, sizeof(isakmp_index)); 830 if (data) 831 memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l); 832 833 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph1->flags); 834 vfree(payload); 835 836 return error; 837} 838 839/* 840 * send Notification payload (for IPsec SA) in Informational exchange 841 */ 842int 843isakmp_info_send_n2(iph2, type, data) 844 struct ph2handle *iph2; 845 int type; 846 vchar_t *data; 847{ 848 struct ph1handle *iph1 = iph2->ph1; 849 vchar_t *payload = NULL; 850 int tlen; 851 int error = 0; 852 struct isakmp_pl_n *n; 853 struct saproto *pr; 854 855 if (!iph2->approval) 856 return EINVAL; 857 858 pr = iph2->approval->head; 859 860 /* XXX must be get proper spi */ 861 tlen = sizeof(*n) + pr->spisize; 862 if (data) 863 tlen += data->l; 864 payload = vmalloc(tlen); 865 if (payload == NULL) { 866 plog(LLV_ERROR, LOCATION, NULL, 867 "failed to get buffer to send.\n"); 868 return errno; 869 } 870 871 n = (struct isakmp_pl_n *)payload->v; 872 n->h.np = ISAKMP_NPTYPE_NONE; 873 n->h.len = htons(tlen); 874 n->doi = htonl(IPSEC_DOI); /* IPSEC DOI (1) */ 875 n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/ 876 n->spi_size = pr->spisize; 877 n->type = htons(type); 878 *(u_int32_t *)(n + 1) = pr->spi; 879 if (data) 880 memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l); 881 882 iph2->flags |= ISAKMP_FLAG_E; /* XXX Should we do FLAG_A ? */ 883 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph2->flags); 884 vfree(payload); 885 886 return error; 887} 888 889/* 890 * send Information 891 * When ph1->skeyid_a == NULL, send message without encoding. 892 */ 893int 894isakmp_info_send_common(iph1, payload, np, flags) 895 struct ph1handle *iph1; 896 vchar_t *payload; 897 u_int32_t np; 898 int flags; 899{ 900 struct ph2handle *iph2 = NULL; 901 vchar_t *hash = NULL; 902 struct isakmp *isakmp; 903 struct isakmp_gen *gen; 904 char *p; 905 int tlen; 906 int error = -1; 907 908 /* add new entry to isakmp status table */ 909 iph2 = newph2(); 910 if (iph2 == NULL) 911 goto end; 912 913 iph2->dst = dupsaddr(iph1->remote); 914 if (iph2->dst == NULL) { 915 delph2(iph2); 916 goto end; 917 } 918 iph2->src = dupsaddr(iph1->local); 919 if (iph2->src == NULL) { 920 delph2(iph2); 921 goto end; 922 } 923 switch (iph1->remote->sa_family) { 924 case AF_INET: 925#if (!defined(ENABLE_NATT)) || (defined(BROKEN_NATT)) 926 ((struct sockaddr_in *)iph2->dst)->sin_port = 0; 927 ((struct sockaddr_in *)iph2->src)->sin_port = 0; 928#endif 929 break; 930#ifdef INET6 931 case AF_INET6: 932#if (!defined(ENABLE_NATT)) || (defined(BROKEN_NATT)) 933 ((struct sockaddr_in6 *)iph2->dst)->sin6_port = 0; 934 ((struct sockaddr_in6 *)iph2->src)->sin6_port = 0; 935#endif 936 break; 937#endif 938 default: 939 plog(LLV_ERROR, LOCATION, NULL, 940 "invalid family: %d\n", iph1->remote->sa_family); 941 delph2(iph2); 942 goto end; 943 } 944 iph2->ph1 = iph1; 945 iph2->side = INITIATOR; 946 iph2->status = PHASE2ST_START; 947 iph2->msgid = isakmp_newmsgid2(iph1); 948 949 /* get IV and HASH(1) if skeyid_a was generated. */ 950 if (iph1->skeyid_a != NULL) { 951 iph2->ivm = oakley_newiv2(iph1, iph2->msgid); 952 if (iph2->ivm == NULL) { 953 delph2(iph2); 954 goto end; 955 } 956 957 /* generate HASH(1) */ 958 hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, payload); 959 if (hash == NULL) { 960 delph2(iph2); 961 goto end; 962 } 963 964 /* initialized total buffer length */ 965 tlen = hash->l; 966 tlen += sizeof(*gen); 967 } else { 968 /* IKE-SA is not established */ 969 hash = NULL; 970 971 /* initialized total buffer length */ 972 tlen = 0; 973 } 974 if ((flags & ISAKMP_FLAG_A) == 0) 975 iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_E); 976 else 977 iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_A); 978 979 insph2(iph2); 980 bindph12(iph1, iph2); 981 982 tlen += sizeof(*isakmp) + payload->l; 983 984 /* create buffer for isakmp payload */ 985 iph2->sendbuf = vmalloc(tlen); 986 if (iph2->sendbuf == NULL) { 987 plog(LLV_ERROR, LOCATION, NULL, 988 "failed to get buffer to send.\n"); 989 goto err; 990 } 991 992 /* create isakmp header */ 993 isakmp = (struct isakmp *)iph2->sendbuf->v; 994 memcpy(&isakmp->i_ck, &iph1->index.i_ck, sizeof(cookie_t)); 995 memcpy(&isakmp->r_ck, &iph1->index.r_ck, sizeof(cookie_t)); 996 isakmp->np = hash == NULL ? (np & 0xff) : ISAKMP_NPTYPE_HASH; 997 isakmp->v = iph1->version; 998 isakmp->etype = ISAKMP_ETYPE_INFO; 999 isakmp->flags = iph2->flags; 1000 memcpy(&isakmp->msgid, &iph2->msgid, sizeof(isakmp->msgid)); 1001 isakmp->len = htonl(tlen); 1002 p = (char *)(isakmp + 1); 1003 1004 /* create HASH payload */ 1005 if (hash != NULL) { 1006 gen = (struct isakmp_gen *)p; 1007 gen->np = np & 0xff; 1008 gen->len = htons(sizeof(*gen) + hash->l); 1009 p += sizeof(*gen); 1010 memcpy(p, hash->v, hash->l); 1011 p += hash->l; 1012 } 1013 1014 /* add payload */ 1015 memcpy(p, payload->v, payload->l); 1016 p += payload->l; 1017 1018#ifdef HAVE_PRINT_ISAKMP_C 1019 isakmp_printpacket(iph2->sendbuf, iph1->local, iph1->remote, 1); 1020#endif 1021 1022 /* encoding */ 1023 if (ISSET(isakmp->flags, ISAKMP_FLAG_E)) { 1024 vchar_t *tmp; 1025 1026 tmp = oakley_do_encrypt(iph2->ph1, iph2->sendbuf, iph2->ivm->ive, 1027 iph2->ivm->iv); 1028 VPTRINIT(iph2->sendbuf); 1029 if (tmp == NULL) 1030 goto err; 1031 iph2->sendbuf = tmp; 1032 } 1033 1034 /* HDR*, HASH(1), N */ 1035 if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0) { 1036 VPTRINIT(iph2->sendbuf); 1037 goto err; 1038 } 1039 1040 plog(LLV_DEBUG, LOCATION, NULL, 1041 "sendto Information %s.\n", s_isakmp_nptype(np)); 1042 1043 /* 1044 * don't resend notify message because peer can use Acknowledged 1045 * Informational if peer requires the reply of the notify message. 1046 */ 1047 1048 /* XXX If Acknowledged Informational required, don't delete ph2handle */ 1049 error = 0; 1050 VPTRINIT(iph2->sendbuf); 1051 goto err; /* XXX */ 1052 1053end: 1054 if (hash) 1055 vfree(hash); 1056 return error; 1057 1058err: 1059 unbindph12(iph2); 1060 remph2(iph2); 1061 delph2(iph2); 1062 goto end; 1063} 1064 1065/* 1066 * add a notify payload to buffer by reallocating buffer. 1067 * If buf == NULL, the function only create a notify payload. 1068 * 1069 * XXX Which is SPI to be included, inbound or outbound ? 1070 */ 1071vchar_t * 1072isakmp_add_pl_n(buf0, np_p, type, pr, data) 1073 vchar_t *buf0; 1074 u_int8_t **np_p; 1075 int type; 1076 struct saproto *pr; 1077 vchar_t *data; 1078{ 1079 vchar_t *buf = NULL; 1080 struct isakmp_pl_n *n; 1081 int tlen; 1082 int oldlen = 0; 1083 1084 if (*np_p) 1085 **np_p = ISAKMP_NPTYPE_N; 1086 1087 tlen = sizeof(*n) + pr->spisize; 1088 1089 if (data) 1090 tlen += data->l; 1091 if (buf0) { 1092 oldlen = buf0->l; 1093 buf = vrealloc(buf0, buf0->l + tlen); 1094 } else 1095 buf = vmalloc(tlen); 1096 if (!buf) { 1097 plog(LLV_ERROR, LOCATION, NULL, 1098 "failed to get a payload buffer.\n"); 1099 return NULL; 1100 } 1101 1102 n = (struct isakmp_pl_n *)(buf->v + oldlen); 1103 n->h.np = ISAKMP_NPTYPE_NONE; 1104 n->h.len = htons(tlen); 1105 n->doi = htonl(IPSEC_DOI); /* IPSEC DOI (1) */ 1106 n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/ 1107 n->spi_size = pr->spisize; 1108 n->type = htons(type); 1109 *(u_int32_t *)(n + 1) = pr->spi; /* XXX */ 1110 if (data) 1111 memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l); 1112 1113 /* save the pointer of next payload type */ 1114 *np_p = &n->h.np; 1115 1116 return buf; 1117} 1118 1119static void 1120purge_isakmp_spi(proto, spi, n) 1121 int proto; 1122 isakmp_index *spi; /*network byteorder*/ 1123 size_t n; 1124{ 1125 struct ph1handle *iph1; 1126 size_t i; 1127 1128 for (i = 0; i < n; i++) { 1129 iph1 = getph1byindex(&spi[i]); 1130 if (!iph1) 1131 continue; 1132 1133 plog(LLV_INFO, LOCATION, NULL, 1134 "purged ISAKMP-SA proto_id=%s spi=%s.\n", 1135 s_ipsecdoi_proto(proto), 1136 isakmp_pindex(&spi[i], 0)); 1137 1138 SCHED_KILL(iph1->sce); 1139 iph1->status = PHASE1ST_EXPIRED; 1140 iph1->sce = sched_new(1, isakmp_ph1delete_stub, iph1); 1141 } 1142} 1143 1144 1145 1146void 1147purge_ipsec_spi(dst0, proto, spi, n) 1148 struct sockaddr *dst0; 1149 int proto; 1150 u_int32_t *spi; /*network byteorder*/ 1151 size_t n; 1152{ 1153 vchar_t *buf = NULL; 1154 struct sadb_msg *msg, *next, *end; 1155 struct sadb_sa *sa; 1156 struct sadb_lifetime *lt; 1157 struct sockaddr *src, *dst; 1158 struct ph2handle *iph2; 1159 u_int64_t created; 1160 size_t i; 1161 caddr_t mhp[SADB_EXT_MAX + 1]; 1162 1163 plog(LLV_DEBUG2, LOCATION, NULL, 1164 "purge_ipsec_spi:\n"); 1165 plog(LLV_DEBUG2, LOCATION, NULL, "dst0: %s\n", saddr2str(dst0)); 1166 plog(LLV_DEBUG2, LOCATION, NULL, "SPI: %08X\n", ntohl(spi[0])); 1167 1168 buf = pfkey_dump_sadb(ipsecdoi2pfkey_proto(proto)); 1169 if (buf == NULL) { 1170 plog(LLV_DEBUG, LOCATION, NULL, 1171 "pfkey_dump_sadb returned nothing.\n"); 1172 return; 1173 } 1174 1175 msg = (struct sadb_msg *)buf->v; 1176 end = (struct sadb_msg *)(buf->v + buf->l); 1177 1178 while (msg < end) { 1179 if ((msg->sadb_msg_len << 3) < sizeof(*msg)) 1180 break; 1181 next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3)); 1182 if (msg->sadb_msg_type != SADB_DUMP) { 1183 msg = next; 1184 continue; 1185 } 1186 1187 if (pfkey_align(msg, mhp) || pfkey_check(mhp)) { 1188 plog(LLV_ERROR, LOCATION, NULL, 1189 "pfkey_check (%s)\n", ipsec_strerror()); 1190 msg = next; 1191 continue; 1192 } 1193 1194 sa = (struct sadb_sa *)(mhp[SADB_EXT_SA]); 1195 if (!sa 1196 || !mhp[SADB_EXT_ADDRESS_SRC] 1197 || !mhp[SADB_EXT_ADDRESS_DST]) { 1198 msg = next; 1199 continue; 1200 } 1201 src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]); 1202 dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]); 1203 lt = (struct sadb_lifetime*)mhp[SADB_EXT_LIFETIME_HARD]; 1204 if(lt != NULL) 1205 created = lt->sadb_lifetime_addtime; 1206 else 1207 created = 0; 1208 1209 if (sa->sadb_sa_state != SADB_SASTATE_MATURE 1210 && sa->sadb_sa_state != SADB_SASTATE_DYING) { 1211 msg = next; 1212 continue; 1213 } 1214 plog(LLV_DEBUG2, LOCATION, NULL, "src: %s\n", saddr2str(src)); 1215 plog(LLV_DEBUG2, LOCATION, NULL, "dst: %s\n", saddr2str(dst)); 1216 1217 1218 1219 /* XXX n^2 algorithm, inefficient */ 1220 1221 /* don't delete inbound SAs at the moment */ 1222 /* XXX should we remove SAs with opposite direction as well? */ 1223 if (CMPSADDR(dst0, dst)) { 1224 msg = next; 1225 continue; 1226 } 1227 1228 for (i = 0; i < n; i++) { 1229 plog(LLV_DEBUG, LOCATION, NULL, 1230 "check spi(packet)=%u spi(db)=%u.\n", 1231 ntohl(spi[i]), ntohl(sa->sadb_sa_spi)); 1232 if (spi[i] != sa->sadb_sa_spi) 1233 continue; 1234 1235 pfkey_send_delete(lcconf->sock_pfkey, 1236 msg->sadb_msg_satype, 1237 IPSEC_MODE_ANY, 1238 src, dst, sa->sadb_sa_spi); 1239 1240 /* 1241 * delete a relative phase 2 handler. 1242 * continue to process if no relative phase 2 handler 1243 * exists. 1244 */ 1245 iph2 = getph2bysaidx(src, dst, proto, spi[i]); 1246 if(iph2 != NULL){ 1247 delete_spd(iph2, created); 1248 unbindph12(iph2); 1249 remph2(iph2); 1250 delph2(iph2); 1251 } 1252 1253 plog(LLV_INFO, LOCATION, NULL, 1254 "purged IPsec-SA proto_id=%s spi=%u.\n", 1255 s_ipsecdoi_proto(proto), 1256 ntohl(spi[i])); 1257 } 1258 1259 msg = next; 1260 } 1261 1262 if (buf) 1263 vfree(buf); 1264} 1265 1266/* 1267 * delete all phase2 sa relatived to the destination address. 1268 * Don't delete Phase 1 handlers on INITIAL-CONTACT, and don't ignore 1269 * an INITIAL-CONTACT if we have contacted the peer. This matches the 1270 * Sun IKE behavior, and makes rekeying work much better when the peer 1271 * restarts. 1272 */ 1273static void 1274info_recv_initialcontact(iph1) 1275 struct ph1handle *iph1; 1276{ 1277 vchar_t *buf = NULL; 1278 struct sadb_msg *msg, *next, *end; 1279 struct sadb_sa *sa; 1280 struct sockaddr *src, *dst; 1281 caddr_t mhp[SADB_EXT_MAX + 1]; 1282 int proto_id, i; 1283 struct ph2handle *iph2; 1284#if 0 1285 char *loc, *rem; 1286#endif 1287 1288 if (f_local) 1289 return; 1290 1291#if 0 1292 loc = racoon_strdup(saddrwop2str(iph1->local)); 1293 rem = racoon_strdup(saddrwop2str(iph1->remote)); 1294 STRDUP_FATAL(loc); 1295 STRDUP_FATAL(rem); 1296 1297 /* 1298 * Purge all IPSEC-SAs for the peer. We can do this 1299 * the easy way (using a PF_KEY SADB_DELETE extension) 1300 * or we can do it the hard way. 1301 */ 1302 for (i = 0; i < pfkey_nsatypes; i++) { 1303 proto_id = pfkey2ipsecdoi_proto(pfkey_satypes[i].ps_satype); 1304 1305 plog(LLV_INFO, LOCATION, NULL, 1306 "purging %s SAs for %s -> %s\n", 1307 pfkey_satypes[i].ps_name, loc, rem); 1308 if (pfkey_send_delete_all(lcconf->sock_pfkey, 1309 pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY, 1310 iph1->local, iph1->remote) == -1) { 1311 plog(LLV_ERROR, LOCATION, NULL, 1312 "delete_all %s -> %s failed for %s (%s)\n", 1313 loc, rem, 1314 pfkey_satypes[i].ps_name, ipsec_strerror()); 1315 goto the_hard_way; 1316 } 1317 1318 deleteallph2(iph1->local, iph1->remote, proto_id); 1319 1320 plog(LLV_INFO, LOCATION, NULL, 1321 "purging %s SAs for %s -> %s\n", 1322 pfkey_satypes[i].ps_name, rem, loc); 1323 if (pfkey_send_delete_all(lcconf->sock_pfkey, 1324 pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY, 1325 iph1->remote, iph1->local) == -1) { 1326 plog(LLV_ERROR, LOCATION, NULL, 1327 "delete_all %s -> %s failed for %s (%s)\n", 1328 rem, loc, 1329 pfkey_satypes[i].ps_name, ipsec_strerror()); 1330 goto the_hard_way; 1331 } 1332 1333 deleteallph2(iph1->remote, iph1->local, proto_id); 1334 } 1335 1336 racoon_free(loc); 1337 racoon_free(rem); 1338 return; 1339 1340 the_hard_way: 1341 racoon_free(loc); 1342 racoon_free(rem); 1343#endif 1344 1345 buf = pfkey_dump_sadb(SADB_SATYPE_UNSPEC); 1346 if (buf == NULL) { 1347 plog(LLV_DEBUG, LOCATION, NULL, 1348 "pfkey_dump_sadb returned nothing.\n"); 1349 return; 1350 } 1351 1352 msg = (struct sadb_msg *)buf->v; 1353 end = (struct sadb_msg *)(buf->v + buf->l); 1354 1355 while (msg < end) { 1356 if ((msg->sadb_msg_len << 3) < sizeof(*msg)) 1357 break; 1358 next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3)); 1359 if (msg->sadb_msg_type != SADB_DUMP) { 1360 msg = next; 1361 continue; 1362 } 1363 1364 if (pfkey_align(msg, mhp) || pfkey_check(mhp)) { 1365 plog(LLV_ERROR, LOCATION, NULL, 1366 "pfkey_check (%s)\n", ipsec_strerror()); 1367 msg = next; 1368 continue; 1369 } 1370 1371 if (mhp[SADB_EXT_SA] == NULL 1372 || mhp[SADB_EXT_ADDRESS_SRC] == NULL 1373 || mhp[SADB_EXT_ADDRESS_DST] == NULL) { 1374 msg = next; 1375 continue; 1376 } 1377 sa = (struct sadb_sa *)mhp[SADB_EXT_SA]; 1378 src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]); 1379 dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]); 1380 1381 if (sa->sadb_sa_state != SADB_SASTATE_MATURE 1382 && sa->sadb_sa_state != SADB_SASTATE_DYING) { 1383 msg = next; 1384 continue; 1385 } 1386 1387 /* 1388 * RFC2407 4.6.3.3 INITIAL-CONTACT is the message that 1389 * announces the sender of the message was rebooted. 1390 * it is interpreted to delete all SAs which source address 1391 * is the sender of the message. 1392 * racoon only deletes SA which is matched both the 1393 * source address and the destination accress. 1394 */ 1395#ifdef ENABLE_NATT 1396 /* 1397 * XXX RFC 3947 says that whe MUST NOT use IP+port to find old SAs 1398 * from this peer ! 1399 */ 1400 if(iph1->natt_flags & NAT_DETECTED){ 1401 if (CMPSADDR(iph1->local, src) == 0 && 1402 CMPSADDR(iph1->remote, dst) == 0) 1403 ; 1404 else if (CMPSADDR(iph1->remote, src) == 0 && 1405 CMPSADDR(iph1->local, dst) == 0) 1406 ; 1407 else { 1408 msg = next; 1409 continue; 1410 } 1411 } else 1412#endif 1413 /* If there is no NAT-T, we don't have to check addr + port... 1414 * XXX what about a configuration with a remote peers which is not 1415 * NATed, but which NATs some other peers ? 1416 * Here, the INITIAl-CONTACT would also flush all those NATed peers !! 1417 */ 1418 if (cmpsaddrwop(iph1->local, src) == 0 && 1419 cmpsaddrwop(iph1->remote, dst) == 0) 1420 ; 1421 else if (cmpsaddrwop(iph1->remote, src) == 0 && 1422 cmpsaddrwop(iph1->local, dst) == 0) 1423 ; 1424 else { 1425 msg = next; 1426 continue; 1427 } 1428 1429 /* 1430 * Make sure this is an SATYPE that we manage. 1431 * This is gross; too bad we couldn't do it the 1432 * easy way. 1433 */ 1434 for (i = 0; i < pfkey_nsatypes; i++) { 1435 if (pfkey_satypes[i].ps_satype == 1436 msg->sadb_msg_satype) 1437 break; 1438 } 1439 if (i == pfkey_nsatypes) { 1440 msg = next; 1441 continue; 1442 } 1443 1444 plog(LLV_INFO, LOCATION, NULL, 1445 "purging spi=%u.\n", ntohl(sa->sadb_sa_spi)); 1446 pfkey_send_delete(lcconf->sock_pfkey, 1447 msg->sadb_msg_satype, 1448 IPSEC_MODE_ANY, src, dst, sa->sadb_sa_spi); 1449 1450 /* 1451 * delete a relative phase 2 handler. 1452 * continue to process if no relative phase 2 handler 1453 * exists. 1454 */ 1455 proto_id = pfkey2ipsecdoi_proto(msg->sadb_msg_satype); 1456 iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi); 1457 if (iph2) { 1458 delete_spd(iph2, 0); 1459 unbindph12(iph2); 1460 remph2(iph2); 1461 delph2(iph2); 1462 } 1463 1464 msg = next; 1465 } 1466 1467 vfree(buf); 1468} 1469 1470void 1471isakmp_check_notify(gen, iph1) 1472 struct isakmp_gen *gen; /* points to Notify payload */ 1473 struct ph1handle *iph1; 1474{ 1475 struct isakmp_pl_n *notify = (struct isakmp_pl_n *)gen; 1476 1477 plog(LLV_DEBUG, LOCATION, iph1->remote, 1478 "Notify Message received\n"); 1479 1480 switch (ntohs(notify->type)) { 1481 case ISAKMP_NTYPE_CONNECTED: 1482 case ISAKMP_NTYPE_RESPONDER_LIFETIME: 1483 case ISAKMP_NTYPE_REPLAY_STATUS: 1484 case ISAKMP_NTYPE_HEARTBEAT: 1485#ifdef ENABLE_HYBRID 1486 case ISAKMP_NTYPE_UNITY_HEARTBEAT: 1487#endif 1488 plog(LLV_WARNING, LOCATION, iph1->remote, 1489 "ignore %s notification.\n", 1490 s_isakmp_notify_msg(ntohs(notify->type))); 1491 break; 1492 case ISAKMP_NTYPE_INITIAL_CONTACT: 1493 plog(LLV_WARNING, LOCATION, iph1->remote, 1494 "ignore INITIAL-CONTACT notification, " 1495 "because it is only accepted after phase1.\n"); 1496 break; 1497 default: 1498 isakmp_info_send_n1(iph1, ISAKMP_NTYPE_INVALID_PAYLOAD_TYPE, NULL); 1499 plog(LLV_ERROR, LOCATION, iph1->remote, 1500 "received unknown notification type %s.\n", 1501 s_isakmp_notify_msg(ntohs(notify->type))); 1502 } 1503 1504 return; 1505} 1506 1507 1508#ifdef ENABLE_DPD 1509static int 1510isakmp_info_recv_r_u (iph1, ru, msgid) 1511 struct ph1handle *iph1; 1512 struct isakmp_pl_ru *ru; 1513 u_int32_t msgid; 1514{ 1515 struct isakmp_pl_ru *ru_ack; 1516 vchar_t *payload = NULL; 1517 int tlen; 1518 int error = 0; 1519 1520 plog(LLV_DEBUG, LOCATION, iph1->remote, 1521 "DPD R-U-There received\n"); 1522 1523 /* XXX should compare cookies with iph1->index? 1524 Or is this already done by calling function? */ 1525 tlen = sizeof(*ru_ack); 1526 payload = vmalloc(tlen); 1527 if (payload == NULL) { 1528 plog(LLV_ERROR, LOCATION, NULL, 1529 "failed to get buffer to send.\n"); 1530 return errno; 1531 } 1532 1533 ru_ack = (struct isakmp_pl_ru *)payload->v; 1534 ru_ack->h.np = ISAKMP_NPTYPE_NONE; 1535 ru_ack->h.len = htons(tlen); 1536 ru_ack->doi = htonl(IPSEC_DOI); 1537 ru_ack->type = htons(ISAKMP_NTYPE_R_U_THERE_ACK); 1538 ru_ack->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ? */ 1539 ru_ack->spi_size = sizeof(isakmp_index); 1540 memcpy(ru_ack->i_ck, ru->i_ck, sizeof(cookie_t)); 1541 memcpy(ru_ack->r_ck, ru->r_ck, sizeof(cookie_t)); 1542 ru_ack->data = ru->data; 1543 1544 /* XXX Should we do FLAG_A ? */ 1545 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 1546 ISAKMP_FLAG_E); 1547 vfree(payload); 1548 1549 plog(LLV_DEBUG, LOCATION, NULL, "received a valid R-U-THERE, ACK sent\n"); 1550 1551 /* Should we mark tunnel as active ? */ 1552 return error; 1553} 1554 1555static int 1556isakmp_info_recv_r_u_ack (iph1, ru, msgid) 1557 struct ph1handle *iph1; 1558 struct isakmp_pl_ru *ru; 1559 u_int32_t msgid; 1560{ 1561 1562 plog(LLV_DEBUG, LOCATION, iph1->remote, 1563 "DPD R-U-There-Ack received\n"); 1564 1565 /* XXX Maintain window of acceptable sequence numbers ? 1566 * => ru->data <= iph2->dpd_seq && 1567 * ru->data >= iph2->dpd_seq - iph2->dpd_fails ? */ 1568 if (ntohl(ru->data) != iph1->dpd_seq-1) { 1569 plog(LLV_ERROR, LOCATION, iph1->remote, 1570 "Wrong DPD sequence number (%d, %d expected).\n", 1571 ntohl(ru->data), iph1->dpd_seq-1); 1572 return 0; 1573 } 1574 1575 if (memcmp(ru->i_ck, iph1->index.i_ck, sizeof(cookie_t)) || 1576 memcmp(ru->r_ck, iph1->index.r_ck, sizeof(cookie_t))) { 1577 plog(LLV_ERROR, LOCATION, iph1->remote, 1578 "Cookie mismatch in DPD ACK!.\n"); 1579 return 0; 1580 } 1581 1582 iph1->dpd_fails = 0; 1583 1584 /* Useless ??? */ 1585 iph1->dpd_lastack = time(NULL); 1586 1587 SCHED_KILL(iph1->dpd_r_u); 1588 1589 isakmp_sched_r_u(iph1, 0); 1590 1591 plog(LLV_DEBUG, LOCATION, NULL, "received an R-U-THERE-ACK\n"); 1592 1593 return 0; 1594} 1595 1596 1597 1598 1599/* 1600 * send DPD R-U-THERE payload in Informational exchange. 1601 */ 1602static void 1603isakmp_info_send_r_u(arg) 1604 void *arg; 1605{ 1606 struct ph1handle *iph1 = arg; 1607 1608 /* create R-U-THERE payload */ 1609 struct isakmp_pl_ru *ru; 1610 vchar_t *payload = NULL; 1611 int tlen; 1612 int error = 0; 1613 1614 plog(LLV_DEBUG, LOCATION, iph1->remote, "DPD monitoring....\n"); 1615 1616 if (iph1->dpd_fails >= iph1->rmconf->dpd_maxfails) { 1617 1618 plog(LLV_INFO, LOCATION, iph1->remote, 1619 "DPD: remote (ISAKMP-SA spi=%s) seems to be dead.\n", 1620 isakmp_pindex(&iph1->index, 0)); 1621 1622 EVT_PUSH(iph1->local, iph1->remote, EVTT_DPD_TIMEOUT, NULL); 1623 purge_remote(iph1); 1624 1625 /* Do not reschedule here: phase1 is deleted, 1626 * DPD will be reactivated when a new ph1 will be negociated 1627 */ 1628 return; 1629 } 1630 1631 /* TODO: check recent activity to avoid useless sends... */ 1632 1633 tlen = sizeof(*ru); 1634 payload = vmalloc(tlen); 1635 if (payload == NULL) { 1636 plog(LLV_ERROR, LOCATION, NULL, 1637 "failed to get buffer for payload.\n"); 1638 return; 1639 } 1640 ru = (struct isakmp_pl_ru *)payload->v; 1641 ru->h.np = ISAKMP_NPTYPE_NONE; 1642 ru->h.len = htons(tlen); 1643 ru->doi = htonl(IPSEC_DOI); 1644 ru->type = htons(ISAKMP_NTYPE_R_U_THERE); 1645 ru->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ?*/ 1646 ru->spi_size = sizeof(isakmp_index); 1647 1648 memcpy(ru->i_ck, iph1->index.i_ck, sizeof(cookie_t)); 1649 memcpy(ru->r_ck, iph1->index.r_ck, sizeof(cookie_t)); 1650 1651 if (iph1->dpd_seq == 0){ 1652 /* generate a random seq which is not too big */ 1653 srand(time(NULL)); 1654 iph1->dpd_seq = rand() & 0x0fff; 1655 } 1656 1657 ru->data = htonl(iph1->dpd_seq); 1658 1659 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0); 1660 vfree(payload); 1661 1662 plog(LLV_DEBUG, LOCATION, iph1->remote, 1663 "DPD R-U-There sent (%d)\n", error); 1664 1665 /* will be decreased if ACK received... */ 1666 iph1->dpd_fails++; 1667 1668 /* XXX should be increased only when ACKed ? */ 1669 iph1->dpd_seq++; 1670 1671 /* Reschedule the r_u_there with a short delay, 1672 * will be deleted/rescheduled if ACK received before */ 1673 isakmp_sched_r_u(iph1, 1); 1674 1675 plog(LLV_DEBUG, LOCATION, iph1->remote, 1676 "rescheduling send_r_u (%d).\n", iph1->rmconf->dpd_retry); 1677} 1678 1679/* Schedule a new R-U-THERE */ 1680int 1681isakmp_sched_r_u(iph1, retry) 1682 struct ph1handle *iph1; 1683 int retry; 1684{ 1685 if(iph1 == NULL || 1686 iph1->rmconf == NULL) 1687 return 1; 1688 1689 1690 if(iph1->dpd_support == 0 || 1691 iph1->rmconf->dpd_interval == 0) 1692 return 0; 1693 1694 if(retry) 1695 iph1->dpd_r_u = sched_new(iph1->rmconf->dpd_retry, 1696 isakmp_info_send_r_u, iph1); 1697 else 1698 iph1->dpd_r_u = sched_new(iph1->rmconf->dpd_interval, 1699 isakmp_info_send_r_u, iph1); 1700 1701 return 0; 1702} 1703#endif 1704