1/* $NetBSD: isakmp_inf.c,v 1.47 2011/03/15 13:20:14 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((struct sched *)); 111#endif 112 113static void purge_isakmp_spi __P((int, isakmp_index *, size_t)); 114 115/* %%% 116 * Information Exchange 117 */ 118/* 119 * receive Information 120 */ 121int 122isakmp_info_recv(iph1, msg0) 123 struct ph1handle *iph1; 124 vchar_t *msg0; 125{ 126 vchar_t *msg = NULL; 127 vchar_t *pbuf = NULL; 128 u_int32_t msgid = 0; 129 int error = -1; 130 struct isakmp *isakmp; 131 struct isakmp_gen *gen; 132 struct isakmp_parse_t *pa, *pap; 133 void *p; 134 vchar_t *hash, *payload; 135 struct isakmp_gen *nd; 136 u_int8_t np; 137 int encrypted; 138 139 plog(LLV_DEBUG, LOCATION, NULL, "receive Information.\n"); 140 141 encrypted = ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E); 142 msgid = ((struct isakmp *)msg0->v)->msgid; 143 144 /* Use new IV to decrypt Informational message. */ 145 if (encrypted) { 146 struct isakmp_ivm *ivm; 147 148 if (iph1->ivm == NULL) { 149 plog(LLV_ERROR, LOCATION, NULL, "iph1->ivm == NULL\n"); 150 return -1; 151 } 152 153 /* compute IV */ 154 ivm = oakley_newiv2(iph1, ((struct isakmp *)msg0->v)->msgid); 155 if (ivm == NULL) 156 return -1; 157 158 msg = oakley_do_decrypt(iph1, msg0, ivm->iv, ivm->ive); 159 oakley_delivm(ivm); 160 if (msg == NULL) 161 return -1; 162 163 } else 164 msg = vdup(msg0); 165 166 /* Safety check */ 167 if (msg->l < sizeof(*isakmp) + sizeof(*gen)) { 168 plog(LLV_ERROR, LOCATION, NULL, 169 "ignore information because the " 170 "message is way too short - %zu byte(s).\n", 171 msg->l); 172 goto end; 173 } 174 175 isakmp = (struct isakmp *)msg->v; 176 gen = (struct isakmp_gen *)((caddr_t)isakmp + sizeof(struct isakmp)); 177 np = gen->np; 178 179 if (encrypted) { 180 if (isakmp->np != ISAKMP_NPTYPE_HASH) { 181 plog(LLV_ERROR, LOCATION, NULL, 182 "ignore information because the " 183 "message has no hash payload.\n"); 184 goto end; 185 } 186 187 if (iph1->status != PHASE1ST_ESTABLISHED && 188 iph1->status != PHASE1ST_DYING) { 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 - %zu byte(s).\n", 200 msg->l); 201 goto end; 202 } 203 204 p = (caddr_t) gen + sizeof(struct isakmp_gen); 205 nd = (struct isakmp_gen *) ((caddr_t) gen + ntohs(gen->len)); 206 207 /* nd length check */ 208 if (ntohs(nd->len) > msg->l - (sizeof(struct isakmp) + 209 ntohs(gen->len))) { 210 plog(LLV_ERROR, LOCATION, NULL, 211 "too long payload length (broken message?)\n"); 212 goto end; 213 } 214 215 if (ntohs(nd->len) < sizeof(*nd)) { 216 plog(LLV_ERROR, LOCATION, NULL, 217 "too short payload length (broken message?)\n"); 218 goto end; 219 } 220 221 payload = vmalloc(ntohs(nd->len)); 222 if (payload == NULL) { 223 plog(LLV_ERROR, LOCATION, NULL, 224 "cannot allocate memory\n"); 225 goto end; 226 } 227 228 memcpy(payload->v, (caddr_t) nd, ntohs(nd->len)); 229 230 /* compute HASH */ 231 hash = oakley_compute_hash1(iph1, isakmp->msgid, payload); 232 if (hash == NULL) { 233 plog(LLV_ERROR, LOCATION, NULL, 234 "cannot compute hash\n"); 235 236 vfree(payload); 237 goto end; 238 } 239 240 if (ntohs(gen->len) - sizeof(struct isakmp_gen) != hash->l) { 241 plog(LLV_ERROR, LOCATION, NULL, 242 "ignore information due to hash length mismatch\n"); 243 244 vfree(hash); 245 vfree(payload); 246 goto end; 247 } 248 249 if (memcmp(p, hash->v, hash->l) != 0) { 250 plog(LLV_ERROR, LOCATION, NULL, 251 "ignore information due to hash mismatch\n"); 252 253 vfree(hash); 254 vfree(payload); 255 goto end; 256 } 257 258 plog(LLV_DEBUG, LOCATION, NULL, "hash validated.\n"); 259 260 vfree(hash); 261 vfree(payload); 262 } else { 263 /* make sure the packet was encrypted after the beginning of phase 1. */ 264 switch (iph1->etype) { 265 case ISAKMP_ETYPE_AGG: 266 case ISAKMP_ETYPE_BASE: 267 case ISAKMP_ETYPE_IDENT: 268 if ((iph1->side == INITIATOR && iph1->status < PHASE1ST_MSG3SENT) 269 || (iph1->side == RESPONDER && iph1->status < PHASE1ST_MSG2SENT)) { 270 break; 271 } 272 /*FALLTHRU*/ 273 default: 274 plog(LLV_ERROR, LOCATION, iph1->remote, 275 "%s message must be encrypted\n", 276 s_isakmp_nptype(np)); 277 error = 0; 278 goto end; 279 } 280 } 281 282 if (!(pbuf = isakmp_parse(msg))) { 283 error = -1; 284 goto end; 285 } 286 287 error = 0; 288 for (pa = (struct isakmp_parse_t *)pbuf->v; pa->type; pa++) { 289 switch (pa->type) { 290 case ISAKMP_NPTYPE_HASH: 291 /* Handled above */ 292 break; 293 case ISAKMP_NPTYPE_N: 294 error = isakmp_info_recv_n(iph1, 295 (struct isakmp_pl_n *)pa->ptr, 296 msgid, encrypted); 297 break; 298 case ISAKMP_NPTYPE_D: 299 error = isakmp_info_recv_d(iph1, 300 (struct isakmp_pl_d *)pa->ptr, 301 msgid, encrypted); 302 break; 303 case ISAKMP_NPTYPE_NONCE: 304 /* XXX to be 6.4.2 ike-01.txt */ 305 /* XXX IV is to be synchronized. */ 306 plog(LLV_ERROR, LOCATION, iph1->remote, 307 "ignore Acknowledged Informational\n"); 308 break; 309 default: 310 /* don't send information, see isakmp_ident_r1() */ 311 error = 0; 312 plog(LLV_ERROR, LOCATION, iph1->remote, 313 "reject the packet, " 314 "received unexpected payload type %s.\n", 315 s_isakmp_nptype(gen->np)); 316 } 317 if (error < 0) 318 break; 319 } 320 end: 321 if (msg != NULL) 322 vfree(msg); 323 if (pbuf != NULL) 324 vfree(pbuf); 325 return error; 326} 327 328 329/* 330 * log unhandled / unallowed Notification payload 331 */ 332int 333isakmp_log_notify(iph1, notify, exchange) 334 struct ph1handle *iph1; 335 struct isakmp_pl_n *notify; 336 const char *exchange; 337{ 338 u_int type; 339 char *nraw, *ndata, *nhex; 340 size_t l; 341 342 type = ntohs(notify->type); 343 if (ntohs(notify->h.len) < sizeof(*notify) + notify->spi_size) { 344 plog(LLV_ERROR, LOCATION, iph1->remote, 345 "invalid spi_size in %s notification in %s.\n", 346 s_isakmp_notify_msg(type), exchange); 347 return -1; 348 } 349 350 plog(LLV_ERROR, LOCATION, iph1->remote, 351 "notification %s received in %s.\n", 352 s_isakmp_notify_msg(type), exchange); 353 354 nraw = ((char*) notify) + sizeof(*notify) + notify->spi_size; 355 l = ntohs(notify->h.len) - sizeof(*notify) - notify->spi_size; 356 if (l > 0) { 357 if (type >= ISAKMP_NTYPE_MINERROR && 358 type <= ISAKMP_NTYPE_MAXERROR) { 359 ndata = binsanitize(nraw, l); 360 if (ndata != NULL) { 361 plog(LLV_ERROR, LOCATION, iph1->remote, 362 "error message: '%s'.\n", 363 ndata); 364 racoon_free(ndata); 365 } else { 366 plog(LLV_ERROR, LOCATION, iph1->remote, 367 "Cannot allocate memory\n"); 368 } 369 } else { 370 nhex = val2str(nraw, l); 371 if (nhex != NULL) { 372 plog(LLV_ERROR, LOCATION, iph1->remote, 373 "notification payload: %s.\n", 374 nhex); 375 racoon_free(nhex); 376 } else { 377 plog(LLV_ERROR, LOCATION, iph1->remote, 378 "Cannot allocate memory\n"); 379 } 380 } 381 } 382 383 return 0; 384} 385 386 387/* 388 * handling of Notification payload 389 */ 390static int 391isakmp_info_recv_n(iph1, notify, msgid, encrypted) 392 struct ph1handle *iph1; 393 struct isakmp_pl_n *notify; 394 u_int32_t msgid; 395 int encrypted; 396{ 397 u_int type; 398 399 type = ntohs(notify->type); 400 switch (type) { 401 case ISAKMP_NTYPE_CONNECTED: 402 case ISAKMP_NTYPE_RESPONDER_LIFETIME: 403 case ISAKMP_NTYPE_REPLAY_STATUS: 404#ifdef ENABLE_HYBRID 405 case ISAKMP_NTYPE_UNITY_HEARTBEAT: 406#endif 407 /* do something */ 408 break; 409 case ISAKMP_NTYPE_INITIAL_CONTACT: 410 if (encrypted) 411 return isakmp_info_recv_initialcontact(iph1, NULL); 412 break; 413#ifdef ENABLE_DPD 414 case ISAKMP_NTYPE_R_U_THERE: 415 if (encrypted) 416 return isakmp_info_recv_r_u(iph1, 417 (struct isakmp_pl_ru *)notify, msgid); 418 break; 419 case ISAKMP_NTYPE_R_U_THERE_ACK: 420 if (encrypted) 421 return isakmp_info_recv_r_u_ack(iph1, 422 (struct isakmp_pl_ru *)notify, msgid); 423 break; 424#endif 425 } 426 427 /* If we receive a error notification we should delete the related 428 * phase1 / phase2 handle, and send an event to racoonctl. 429 * However, since phase1 error notifications are not encrypted and 430 * can not be authenticated, it would allow a DoS attack possibility 431 * to handle them. 432 * Phase2 error notifications should be encrypted, so we could handle 433 * those, but it needs implementing (the old code didn't implement 434 * that either). 435 * So we are good to just log the messages here. 436 */ 437 if (encrypted) 438 isakmp_log_notify(iph1, notify, "informational exchange"); 439 else 440 isakmp_log_notify(iph1, notify, "unencrypted informational exchange"); 441 442 return 0; 443} 444 445/* 446 * handling of Deletion payload 447 */ 448static int 449isakmp_info_recv_d(iph1, delete, msgid, encrypted) 450 struct ph1handle *iph1; 451 struct isakmp_pl_d *delete; 452 u_int32_t msgid; 453 int encrypted; 454{ 455 int tlen, num_spi; 456 vchar_t *pbuf; 457 int protected = 0; 458 struct ph1handle *del_ph1; 459 struct ph2handle *iph2; 460 union { 461 u_int32_t spi32; 462 u_int16_t spi16[2]; 463 } spi; 464 465 if (ntohl(delete->doi) != IPSEC_DOI) { 466 plog(LLV_ERROR, LOCATION, iph1->remote, 467 "delete payload with invalid doi:%d.\n", 468 ntohl(delete->doi)); 469#ifdef ENABLE_HYBRID 470 /* 471 * At deconnexion time, Cisco VPN client does this 472 * with a zero DOI. Don't give up in that situation. 473 */ 474 if (((iph1->mode_cfg->flags & 475 ISAKMP_CFG_VENDORID_UNITY) == 0) || (delete->doi != 0)) 476 return 0; 477#else 478 return 0; 479#endif 480 } 481 482 num_spi = ntohs(delete->num_spi); 483 tlen = ntohs(delete->h.len) - sizeof(struct isakmp_pl_d); 484 485 if (tlen != num_spi * delete->spi_size) { 486 plog(LLV_ERROR, LOCATION, iph1->remote, 487 "deletion payload with invalid length.\n"); 488 return 0; 489 } 490 491 plog(LLV_DEBUG, LOCATION, iph1->remote, 492 "delete payload for protocol %s\n", 493 s_ipsecdoi_proto(delete->proto_id)); 494 495 if(!iph1->rmconf->weak_phase1_check && !encrypted) { 496 plog(LLV_WARNING, LOCATION, iph1->remote, 497 "Ignoring unencrypted delete payload " 498 "(check the weak_phase1_check option)\n"); 499 return 0; 500 } 501 502 switch (delete->proto_id) { 503 case IPSECDOI_PROTO_ISAKMP: 504 if (delete->spi_size != sizeof(isakmp_index)) { 505 plog(LLV_ERROR, LOCATION, iph1->remote, 506 "delete payload with strange spi " 507 "size %d(proto_id:%d)\n", 508 delete->spi_size, delete->proto_id); 509 return 0; 510 } 511 512 del_ph1=getph1byindex((isakmp_index *)(delete + 1)); 513 if(del_ph1 != NULL){ 514 515 evt_phase1(iph1, EVT_PHASE1_PEER_DELETED, NULL); 516 sched_cancel(&del_ph1->scr); 517 518 /* 519 * Delete also IPsec-SAs if rekeying is enabled. 520 */ 521 if (ph1_rekey_enabled(del_ph1)) 522 purge_remote(del_ph1); 523 else 524 isakmp_ph1expire(del_ph1); 525 } 526 break; 527 528 case IPSECDOI_PROTO_IPSEC_AH: 529 case IPSECDOI_PROTO_IPSEC_ESP: 530 if (delete->spi_size != sizeof(u_int32_t)) { 531 plog(LLV_ERROR, LOCATION, iph1->remote, 532 "delete payload with strange spi " 533 "size %d(proto_id:%d)\n", 534 delete->spi_size, delete->proto_id); 535 return 0; 536 } 537 purge_ipsec_spi(iph1->remote, delete->proto_id, 538 (u_int32_t *)(delete + 1), num_spi); 539 break; 540 541 case IPSECDOI_PROTO_IPCOMP: 542 /* need to handle both 16bit/32bit SPI */ 543 memset(&spi, 0, sizeof(spi)); 544 if (delete->spi_size == sizeof(spi.spi16[1])) { 545 memcpy(&spi.spi16[1], delete + 1, 546 sizeof(spi.spi16[1])); 547 } else if (delete->spi_size == sizeof(spi.spi32)) 548 memcpy(&spi.spi32, delete + 1, sizeof(spi.spi32)); 549 else { 550 plog(LLV_ERROR, LOCATION, iph1->remote, 551 "delete payload with strange spi " 552 "size %d(proto_id:%d)\n", 553 delete->spi_size, delete->proto_id); 554 return 0; 555 } 556 purge_ipsec_spi(iph1->remote, delete->proto_id, 557 &spi.spi32, num_spi); 558 break; 559 560 default: 561 plog(LLV_ERROR, LOCATION, iph1->remote, 562 "deletion message received, " 563 "invalid proto_id: %d\n", 564 delete->proto_id); 565 return 0; 566 } 567 568 plog(LLV_DEBUG, LOCATION, NULL, "purged SAs.\n"); 569 570 return 0; 571} 572 573/* 574 * send Delete payload (for ISAKMP SA) in Informational exchange. 575 */ 576int 577isakmp_info_send_d1(iph1) 578 struct ph1handle *iph1; 579{ 580 struct isakmp_pl_d *d; 581 vchar_t *payload = NULL; 582 int tlen; 583 int error = 0; 584 585 if (iph1->status != PHASE2ST_ESTABLISHED) 586 return 0; 587 588 /* create delete payload */ 589 590 /* send SPIs of inbound SAs. */ 591 /* XXX should send outbound SAs's ? */ 592 tlen = sizeof(*d) + sizeof(isakmp_index); 593 payload = vmalloc(tlen); 594 if (payload == NULL) { 595 plog(LLV_ERROR, LOCATION, NULL, 596 "failed to get buffer for payload.\n"); 597 return errno; 598 } 599 600 d = (struct isakmp_pl_d *)payload->v; 601 d->h.np = ISAKMP_NPTYPE_NONE; 602 d->h.len = htons(tlen); 603 d->doi = htonl(IPSEC_DOI); 604 d->proto_id = IPSECDOI_PROTO_ISAKMP; 605 d->spi_size = sizeof(isakmp_index); 606 d->num_spi = htons(1); 607 memcpy(d + 1, &iph1->index, sizeof(isakmp_index)); 608 609 error = isakmp_info_send_common(iph1, payload, 610 ISAKMP_NPTYPE_D, 0); 611 vfree(payload); 612 613 return error; 614} 615 616/* 617 * send Delete payload (for IPsec SA) in Informational exchange, based on 618 * pfkey msg. It sends always single SPI. 619 */ 620int 621isakmp_info_send_d2(iph2) 622 struct ph2handle *iph2; 623{ 624 struct ph1handle *iph1; 625 struct saproto *pr; 626 struct isakmp_pl_d *d; 627 vchar_t *payload = NULL; 628 int tlen; 629 int error = 0; 630 u_int8_t *spi; 631 632 if (iph2->status != PHASE2ST_ESTABLISHED) 633 return 0; 634 635 /* 636 * don't send delete information if there is no phase 1 handler. 637 * It's nonsensical to negotiate phase 1 to send the information. 638 */ 639 iph1 = getph1byaddr(iph2->src, iph2->dst, 0); 640 if (iph1 == NULL){ 641 plog(LLV_DEBUG2, LOCATION, NULL, 642 "No ph1 handler found, could not send DELETE_SA\n"); 643 return 0; 644 } 645 646 /* create delete payload */ 647 for (pr = iph2->approval->head; pr != NULL; pr = pr->next) { 648 649 /* send SPIs of inbound SAs. */ 650 /* 651 * XXX should I send outbound SAs's ? 652 * I send inbound SAs's SPI only at the moment because I can't 653 * decode any more if peer send encoded packet without aware of 654 * deletion of SA. Outbound SAs don't come under the situation. 655 */ 656 tlen = sizeof(*d) + pr->spisize; 657 payload = vmalloc(tlen); 658 if (payload == NULL) { 659 plog(LLV_ERROR, LOCATION, NULL, 660 "failed to get buffer for payload.\n"); 661 return errno; 662 } 663 664 d = (struct isakmp_pl_d *)payload->v; 665 d->h.np = ISAKMP_NPTYPE_NONE; 666 d->h.len = htons(tlen); 667 d->doi = htonl(IPSEC_DOI); 668 d->proto_id = pr->proto_id; 669 d->spi_size = pr->spisize; 670 d->num_spi = htons(1); 671 /* 672 * XXX SPI bits are left-filled, for use with IPComp. 673 * we should be switching to variable-length spi field... 674 */ 675 spi = (u_int8_t *)&pr->spi; 676 spi += sizeof(pr->spi); 677 spi -= pr->spisize; 678 memcpy(d + 1, spi, pr->spisize); 679 680 error = isakmp_info_send_common(iph1, payload, 681 ISAKMP_NPTYPE_D, 0); 682 vfree(payload); 683 } 684 685 return error; 686} 687 688/* 689 * send Notification payload (for without ISAKMP SA) in Informational exchange 690 */ 691int 692isakmp_info_send_nx(isakmp, remote, local, type, data) 693 struct isakmp *isakmp; 694 struct sockaddr *remote, *local; 695 int type; 696 vchar_t *data; 697{ 698 struct ph1handle *iph1 = NULL; 699 vchar_t *payload = NULL; 700 int tlen; 701 int error = -1; 702 struct isakmp_pl_n *n; 703 int spisiz = 0; /* see below */ 704 705 /* add new entry to isakmp status table. */ 706 iph1 = newph1(); 707 if (iph1 == NULL) 708 return -1; 709 710 memcpy(&iph1->index.i_ck, &isakmp->i_ck, sizeof(cookie_t)); 711 isakmp_newcookie((char *)&iph1->index.r_ck, remote, local); 712 iph1->status = PHASE1ST_START; 713 iph1->side = INITIATOR; 714 iph1->version = isakmp->v; 715 iph1->flags = 0; 716 iph1->msgid = 0; /* XXX */ 717#ifdef ENABLE_HYBRID 718 if ((iph1->mode_cfg = isakmp_cfg_mkstate()) == NULL) 719 goto end; 720#endif 721#ifdef ENABLE_FRAG 722 iph1->frag = 0; 723 iph1->frag_chain = NULL; 724#endif 725 726 /* copy remote address */ 727 if (copy_ph1addresses(iph1, NULL, remote, local) < 0) 728 goto end; 729 730 tlen = sizeof(*n) + spisiz; 731 if (data) 732 tlen += data->l; 733 payload = vmalloc(tlen); 734 if (payload == NULL) { 735 plog(LLV_ERROR, LOCATION, NULL, 736 "failed to get buffer to send.\n"); 737 goto end; 738 } 739 740 n = (struct isakmp_pl_n *)payload->v; 741 n->h.np = ISAKMP_NPTYPE_NONE; 742 n->h.len = htons(tlen); 743 n->doi = htonl(IPSEC_DOI); 744 n->proto_id = IPSECDOI_KEY_IKE; 745 n->spi_size = spisiz; 746 n->type = htons(type); 747 if (spisiz) 748 memset(n + 1, 0, spisiz); /* XXX spisiz is always 0 */ 749 if (data) 750 memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l); 751 752 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0); 753 vfree(payload); 754 755 end: 756 if (iph1 != NULL) 757 delph1(iph1); 758 759 return error; 760} 761 762/* 763 * send Notification payload (for ISAKMP SA) in Informational exchange 764 */ 765int 766isakmp_info_send_n1(iph1, type, data) 767 struct ph1handle *iph1; 768 int type; 769 vchar_t *data; 770{ 771 vchar_t *payload = NULL; 772 int tlen; 773 int error = 0; 774 struct isakmp_pl_n *n; 775 int spisiz; 776 777 /* 778 * note on SPI size: which description is correct? I have chosen 779 * this to be 0. 780 * 781 * RFC2408 3.1, 2nd paragraph says: ISAKMP SA is identified by 782 * Initiator/Responder cookie and SPI has no meaning, SPI size = 0. 783 * RFC2408 3.1, first paragraph on page 40: ISAKMP SA is identified 784 * by cookie and SPI has no meaning, 0 <= SPI size <= 16. 785 * RFC2407 4.6.3.3, INITIAL-CONTACT is required to set to 16. 786 */ 787 if (type == ISAKMP_NTYPE_INITIAL_CONTACT) 788 spisiz = sizeof(isakmp_index); 789 else 790 spisiz = 0; 791 792 tlen = sizeof(*n) + spisiz; 793 if (data) 794 tlen += data->l; 795 payload = vmalloc(tlen); 796 if (payload == NULL) { 797 plog(LLV_ERROR, LOCATION, NULL, 798 "failed to get buffer to send.\n"); 799 return errno; 800 } 801 802 n = (struct isakmp_pl_n *)payload->v; 803 n->h.np = ISAKMP_NPTYPE_NONE; 804 n->h.len = htons(tlen); 805 n->doi = htonl(iph1->rmconf->doitype); 806 n->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX to be configurable ? */ 807 n->spi_size = spisiz; 808 n->type = htons(type); 809 if (spisiz) 810 memcpy(n + 1, &iph1->index, sizeof(isakmp_index)); 811 if (data) 812 memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l); 813 814 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph1->flags); 815 vfree(payload); 816 817 return error; 818} 819 820/* 821 * send Notification payload (for IPsec SA) in Informational exchange 822 */ 823int 824isakmp_info_send_n2(iph2, type, data) 825 struct ph2handle *iph2; 826 int type; 827 vchar_t *data; 828{ 829 struct ph1handle *iph1 = iph2->ph1; 830 vchar_t *payload = NULL; 831 int tlen; 832 int error = 0; 833 struct isakmp_pl_n *n; 834 struct saproto *pr; 835 836 if (!iph2->approval) 837 return EINVAL; 838 839 pr = iph2->approval->head; 840 841 /* XXX must be get proper spi */ 842 tlen = sizeof(*n) + pr->spisize; 843 if (data) 844 tlen += data->l; 845 payload = vmalloc(tlen); 846 if (payload == NULL) { 847 plog(LLV_ERROR, LOCATION, NULL, 848 "failed to get buffer to send.\n"); 849 return errno; 850 } 851 852 n = (struct isakmp_pl_n *)payload->v; 853 n->h.np = ISAKMP_NPTYPE_NONE; 854 n->h.len = htons(tlen); 855 n->doi = htonl(IPSEC_DOI); /* IPSEC DOI (1) */ 856 n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/ 857 n->spi_size = pr->spisize; 858 n->type = htons(type); 859 *(u_int32_t *)(n + 1) = pr->spi; 860 if (data) 861 memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l); 862 863 iph2->flags |= ISAKMP_FLAG_E; /* XXX Should we do FLAG_A ? */ 864 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph2->flags); 865 vfree(payload); 866 867 return error; 868} 869 870/* 871 * send Information 872 * When ph1->skeyid_a == NULL, send message without encoding. 873 */ 874int 875isakmp_info_send_common(iph1, payload, np, flags) 876 struct ph1handle *iph1; 877 vchar_t *payload; 878 u_int32_t np; 879 int flags; 880{ 881 struct ph2handle *iph2 = NULL; 882 vchar_t *hash = NULL; 883 struct isakmp *isakmp; 884 struct isakmp_gen *gen; 885 char *p; 886 int tlen; 887 int error = -1; 888 889 /* add new entry to isakmp status table */ 890 iph2 = newph2(); 891 if (iph2 == NULL) 892 goto end; 893 894 iph2->dst = dupsaddr(iph1->remote); 895 if (iph2->dst == NULL) { 896 delph2(iph2); 897 goto end; 898 } 899 iph2->src = dupsaddr(iph1->local); 900 if (iph2->src == NULL) { 901 delph2(iph2); 902 goto end; 903 } 904 iph2->side = INITIATOR; 905 iph2->status = PHASE2ST_START; 906 iph2->msgid = isakmp_newmsgid2(iph1); 907 908 /* get IV and HASH(1) if skeyid_a was generated. */ 909 if (iph1->skeyid_a != NULL) { 910 iph2->ivm = oakley_newiv2(iph1, iph2->msgid); 911 if (iph2->ivm == NULL) { 912 delph2(iph2); 913 goto end; 914 } 915 916 /* generate HASH(1) */ 917 hash = oakley_compute_hash1(iph1, iph2->msgid, payload); 918 if (hash == NULL) { 919 delph2(iph2); 920 goto end; 921 } 922 923 /* initialized total buffer length */ 924 tlen = hash->l; 925 tlen += sizeof(*gen); 926 } else { 927 /* IKE-SA is not established */ 928 hash = NULL; 929 930 /* initialized total buffer length */ 931 tlen = 0; 932 } 933 if ((flags & ISAKMP_FLAG_A) == 0) 934 iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_E); 935 else 936 iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_A); 937 938 insph2(iph2); 939 bindph12(iph1, iph2); 940 941 tlen += sizeof(*isakmp) + payload->l; 942 943 /* create buffer for isakmp payload */ 944 iph2->sendbuf = vmalloc(tlen); 945 if (iph2->sendbuf == NULL) { 946 plog(LLV_ERROR, LOCATION, NULL, 947 "failed to get buffer to send.\n"); 948 goto err; 949 } 950 951 /* create isakmp header */ 952 isakmp = (struct isakmp *)iph2->sendbuf->v; 953 memcpy(&isakmp->i_ck, &iph1->index.i_ck, sizeof(cookie_t)); 954 memcpy(&isakmp->r_ck, &iph1->index.r_ck, sizeof(cookie_t)); 955 isakmp->np = hash == NULL ? (np & 0xff) : ISAKMP_NPTYPE_HASH; 956 isakmp->v = iph1->version; 957 isakmp->etype = ISAKMP_ETYPE_INFO; 958 isakmp->flags = iph2->flags; 959 memcpy(&isakmp->msgid, &iph2->msgid, sizeof(isakmp->msgid)); 960 isakmp->len = htonl(tlen); 961 p = (char *)(isakmp + 1); 962 963 /* create HASH payload */ 964 if (hash != NULL) { 965 gen = (struct isakmp_gen *)p; 966 gen->np = np & 0xff; 967 gen->len = htons(sizeof(*gen) + hash->l); 968 p += sizeof(*gen); 969 memcpy(p, hash->v, hash->l); 970 p += hash->l; 971 } 972 973 /* add payload */ 974 memcpy(p, payload->v, payload->l); 975 p += payload->l; 976 977#ifdef HAVE_PRINT_ISAKMP_C 978 isakmp_printpacket(iph2->sendbuf, iph1->local, iph1->remote, 1); 979#endif 980 981 /* encoding */ 982 if (ISSET(isakmp->flags, ISAKMP_FLAG_E)) { 983 vchar_t *tmp; 984 985 tmp = oakley_do_encrypt(iph2->ph1, iph2->sendbuf, iph2->ivm->ive, 986 iph2->ivm->iv); 987 VPTRINIT(iph2->sendbuf); 988 if (tmp == NULL) 989 goto err; 990 iph2->sendbuf = tmp; 991 } 992 993 /* HDR*, HASH(1), N */ 994 if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0) { 995 VPTRINIT(iph2->sendbuf); 996 goto err; 997 } 998 999 plog(LLV_DEBUG, LOCATION, NULL, 1000 "sendto Information %s.\n", s_isakmp_nptype(np)); 1001 1002 /* 1003 * don't resend notify message because peer can use Acknowledged 1004 * Informational if peer requires the reply of the notify message. 1005 */ 1006 1007 /* XXX If Acknowledged Informational required, don't delete ph2handle */ 1008 error = 0; 1009 VPTRINIT(iph2->sendbuf); 1010 goto err; /* XXX */ 1011 1012end: 1013 if (hash) 1014 vfree(hash); 1015 return error; 1016 1017err: 1018 remph2(iph2); 1019 delph2(iph2); 1020 goto end; 1021} 1022 1023/* 1024 * add a notify payload to buffer by reallocating buffer. 1025 * If buf == NULL, the function only create a notify payload. 1026 * 1027 * XXX Which is SPI to be included, inbound or outbound ? 1028 */ 1029vchar_t * 1030isakmp_add_pl_n(buf0, np_p, type, pr, data) 1031 vchar_t *buf0; 1032 u_int8_t **np_p; 1033 int type; 1034 struct saproto *pr; 1035 vchar_t *data; 1036{ 1037 vchar_t *buf = NULL; 1038 struct isakmp_pl_n *n; 1039 int tlen; 1040 int oldlen = 0; 1041 1042 if (*np_p) 1043 **np_p = ISAKMP_NPTYPE_N; 1044 1045 tlen = sizeof(*n) + pr->spisize; 1046 1047 if (data) 1048 tlen += data->l; 1049 if (buf0) { 1050 oldlen = buf0->l; 1051 buf = vrealloc(buf0, buf0->l + tlen); 1052 } else 1053 buf = vmalloc(tlen); 1054 if (!buf) { 1055 plog(LLV_ERROR, LOCATION, NULL, 1056 "failed to get a payload buffer.\n"); 1057 return NULL; 1058 } 1059 1060 n = (struct isakmp_pl_n *)(buf->v + oldlen); 1061 n->h.np = ISAKMP_NPTYPE_NONE; 1062 n->h.len = htons(tlen); 1063 n->doi = htonl(IPSEC_DOI); /* IPSEC DOI (1) */ 1064 n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/ 1065 n->spi_size = pr->spisize; 1066 n->type = htons(type); 1067 *(u_int32_t *)(n + 1) = pr->spi; /* XXX */ 1068 if (data) 1069 memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l); 1070 1071 /* save the pointer of next payload type */ 1072 *np_p = &n->h.np; 1073 1074 return buf; 1075} 1076 1077static void 1078purge_isakmp_spi(proto, spi, n) 1079 int proto; 1080 isakmp_index *spi; /*network byteorder*/ 1081 size_t n; 1082{ 1083 struct ph1handle *iph1; 1084 size_t i; 1085 1086 for (i = 0; i < n; i++) { 1087 iph1 = getph1byindex(&spi[i]); 1088 if (!iph1) 1089 continue; 1090 1091 plog(LLV_INFO, LOCATION, NULL, 1092 "purged ISAKMP-SA proto_id=%s spi=%s.\n", 1093 s_ipsecdoi_proto(proto), 1094 isakmp_pindex(&spi[i], 0)); 1095 1096 iph1->status = PHASE1ST_EXPIRED; 1097 isakmp_ph1delete(iph1); 1098 } 1099} 1100 1101 1102 1103void 1104purge_ipsec_spi(dst0, proto, spi, n) 1105 struct sockaddr *dst0; 1106 int proto; 1107 u_int32_t *spi; /*network byteorder*/ 1108 size_t n; 1109{ 1110 vchar_t *buf = NULL; 1111 struct sadb_msg *msg, *next, *end; 1112 struct sadb_sa *sa; 1113 struct sadb_lifetime *lt; 1114 struct sockaddr *src, *dst; 1115 struct ph2handle *iph2; 1116 u_int64_t created; 1117 size_t i; 1118 caddr_t mhp[SADB_EXT_MAX + 1]; 1119 1120 plog(LLV_DEBUG2, LOCATION, NULL, 1121 "purge_ipsec_spi:\n"); 1122 plog(LLV_DEBUG2, LOCATION, NULL, "dst0: %s\n", saddr2str(dst0)); 1123 plog(LLV_DEBUG2, LOCATION, NULL, "SPI: %08X\n", ntohl(spi[0])); 1124 1125 buf = pfkey_dump_sadb(ipsecdoi2pfkey_proto(proto)); 1126 if (buf == NULL) { 1127 plog(LLV_DEBUG, LOCATION, NULL, 1128 "pfkey_dump_sadb returned nothing.\n"); 1129 return; 1130 } 1131 1132 msg = (struct sadb_msg *)buf->v; 1133 end = (struct sadb_msg *)(buf->v + buf->l); 1134 1135 while (msg < end) { 1136 if ((msg->sadb_msg_len << 3) < sizeof(*msg)) 1137 break; 1138 next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3)); 1139 if (msg->sadb_msg_type != SADB_DUMP) { 1140 msg = next; 1141 continue; 1142 } 1143 1144 if (pfkey_align(msg, mhp) || pfkey_check(mhp)) { 1145 plog(LLV_ERROR, LOCATION, NULL, 1146 "pfkey_check (%s)\n", ipsec_strerror()); 1147 msg = next; 1148 continue; 1149 } 1150 1151 sa = (struct sadb_sa *)(mhp[SADB_EXT_SA]); 1152 if (!sa 1153 || !mhp[SADB_EXT_ADDRESS_SRC] 1154 || !mhp[SADB_EXT_ADDRESS_DST]) { 1155 msg = next; 1156 continue; 1157 } 1158 pk_fixup_sa_addresses(mhp); 1159 src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]); 1160 dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]); 1161 lt = (struct sadb_lifetime*)mhp[SADB_EXT_LIFETIME_HARD]; 1162 if(lt != NULL) 1163 created = lt->sadb_lifetime_addtime; 1164 else 1165 created = 0; 1166 1167 if (sa->sadb_sa_state != SADB_SASTATE_MATURE 1168 && sa->sadb_sa_state != SADB_SASTATE_DYING) { 1169 msg = next; 1170 continue; 1171 } 1172 1173 plog(LLV_DEBUG2, LOCATION, NULL, "src: %s\n", saddr2str(src)); 1174 plog(LLV_DEBUG2, LOCATION, NULL, "dst: %s\n", saddr2str(dst)); 1175 1176 /* XXX n^2 algorithm, inefficient */ 1177 1178 /* don't delete inbound SAs at the moment */ 1179 /* XXX should we remove SAs with opposite direction as well? */ 1180 if (cmpsaddr(dst0, dst) != CMPSADDR_MATCH) { 1181 msg = next; 1182 continue; 1183 } 1184 1185 for (i = 0; i < n; i++) { 1186 plog(LLV_DEBUG, LOCATION, NULL, 1187 "check spi(packet)=%u spi(db)=%u.\n", 1188 ntohl(spi[i]), ntohl(sa->sadb_sa_spi)); 1189 if (spi[i] != sa->sadb_sa_spi) 1190 continue; 1191 1192 pfkey_send_delete(lcconf->sock_pfkey, 1193 msg->sadb_msg_satype, 1194 IPSEC_MODE_ANY, 1195 src, dst, sa->sadb_sa_spi); 1196 1197 /* 1198 * delete a relative phase 2 handler. 1199 * continue to process if no relative phase 2 handler 1200 * exists. 1201 */ 1202 iph2 = getph2bysaidx(src, dst, proto, spi[i]); 1203 if(iph2 != NULL){ 1204 delete_spd(iph2, created); 1205 remph2(iph2); 1206 delph2(iph2); 1207 } 1208 1209 plog(LLV_INFO, LOCATION, NULL, 1210 "purged IPsec-SA proto_id=%s spi=%u.\n", 1211 s_ipsecdoi_proto(proto), 1212 ntohl(spi[i])); 1213 } 1214 1215 msg = next; 1216 } 1217 1218 if (buf) 1219 vfree(buf); 1220} 1221 1222/* 1223 * delete all phase2 sa relatived to the destination address 1224 * (except the phase2 within which the INITIAL-CONTACT was received). 1225 * Don't delete Phase 1 handlers on INITIAL-CONTACT, and don't ignore 1226 * an INITIAL-CONTACT if we have contacted the peer. This matches the 1227 * Sun IKE behavior, and makes rekeying work much better when the peer 1228 * restarts. 1229 */ 1230int 1231isakmp_info_recv_initialcontact(iph1, protectedph2) 1232 struct ph1handle *iph1; 1233 struct ph2handle *protectedph2; 1234{ 1235 vchar_t *buf = NULL; 1236 struct sadb_msg *msg, *next, *end; 1237 struct sadb_sa *sa; 1238 struct sockaddr *src, *dst; 1239 caddr_t mhp[SADB_EXT_MAX + 1]; 1240 int proto_id, i; 1241 struct ph2handle *iph2; 1242#if 0 1243 char *loc, *rem; 1244#endif 1245 1246 plog(LLV_INFO, LOCATION, iph1->remote, "received INITIAL-CONTACT\n"); 1247 1248 if (f_local) 1249 return 0; 1250 1251#if 0 1252 loc = racoon_strdup(saddrwop2str(iph1->local)); 1253 rem = racoon_strdup(saddrwop2str(iph1->remote)); 1254 STRDUP_FATAL(loc); 1255 STRDUP_FATAL(rem); 1256 1257 /* 1258 * Purge all IPSEC-SAs for the peer. We can do this 1259 * the easy way (using a PF_KEY SADB_DELETE extension) 1260 * or we can do it the hard way. 1261 */ 1262 for (i = 0; i < pfkey_nsatypes; i++) { 1263 proto_id = pfkey2ipsecdoi_proto(pfkey_satypes[i].ps_satype); 1264 1265 plog(LLV_INFO, LOCATION, NULL, 1266 "purging %s SAs for %s -> %s\n", 1267 pfkey_satypes[i].ps_name, loc, rem); 1268 if (pfkey_send_delete_all(lcconf->sock_pfkey, 1269 pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY, 1270 iph1->local, iph1->remote) == -1) { 1271 plog(LLV_ERROR, LOCATION, NULL, 1272 "delete_all %s -> %s failed for %s (%s)\n", 1273 loc, rem, 1274 pfkey_satypes[i].ps_name, ipsec_strerror()); 1275 goto the_hard_way; 1276 } 1277 1278 deleteallph2(iph1->local, iph1->remote, proto_id); 1279 1280 plog(LLV_INFO, LOCATION, NULL, 1281 "purging %s SAs for %s -> %s\n", 1282 pfkey_satypes[i].ps_name, rem, loc); 1283 if (pfkey_send_delete_all(lcconf->sock_pfkey, 1284 pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY, 1285 iph1->remote, iph1->local) == -1) { 1286 plog(LLV_ERROR, LOCATION, NULL, 1287 "delete_all %s -> %s failed for %s (%s)\n", 1288 rem, loc, 1289 pfkey_satypes[i].ps_name, ipsec_strerror()); 1290 goto the_hard_way; 1291 } 1292 1293 deleteallph2(iph1->remote, iph1->local, proto_id); 1294 } 1295 1296 racoon_free(loc); 1297 racoon_free(rem); 1298 return 0; 1299 1300 the_hard_way: 1301 racoon_free(loc); 1302 racoon_free(rem); 1303#endif 1304 1305 buf = pfkey_dump_sadb(SADB_SATYPE_UNSPEC); 1306 if (buf == NULL) { 1307 plog(LLV_DEBUG, LOCATION, NULL, 1308 "pfkey_dump_sadb returned nothing.\n"); 1309 return 0; 1310 } 1311 1312 msg = (struct sadb_msg *)buf->v; 1313 end = (struct sadb_msg *)(buf->v + buf->l); 1314 1315 for (; msg < end; msg = next) { 1316 if ((msg->sadb_msg_len << 3) < sizeof(*msg)) 1317 break; 1318 1319 next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3)); 1320 if (msg->sadb_msg_type != SADB_DUMP) 1321 continue; 1322 1323 if (pfkey_align(msg, mhp) || pfkey_check(mhp)) { 1324 plog(LLV_ERROR, LOCATION, NULL, 1325 "pfkey_check (%s)\n", ipsec_strerror()); 1326 continue; 1327 } 1328 1329 if (mhp[SADB_EXT_SA] == NULL 1330 || mhp[SADB_EXT_ADDRESS_SRC] == NULL 1331 || mhp[SADB_EXT_ADDRESS_DST] == NULL) 1332 continue; 1333 1334 sa = (struct sadb_sa *)mhp[SADB_EXT_SA]; 1335 pk_fixup_sa_addresses(mhp); 1336 src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]); 1337 dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]); 1338 1339 if (sa->sadb_sa_state != SADB_SASTATE_MATURE 1340 && sa->sadb_sa_state != SADB_SASTATE_DYING) 1341 continue; 1342 1343 /* 1344 * RFC2407 4.6.3.3 INITIAL-CONTACT is the message that 1345 * announces the sender of the message was rebooted. 1346 * it is interpreted to delete all SAs which source address 1347 * is the sender of the message. 1348 * racoon only deletes SA which is matched both the 1349 * source address and the destination accress. 1350 */ 1351 1352 /* 1353 * Check that the IP and port match. But this is not optimal, 1354 * since NAT-T can make the peer have multiple different 1355 * ports. Correct thing to do is delete all entries with 1356 * same identity. -TT 1357 */ 1358 if ((cmpsaddr(iph1->local, src) != CMPSADDR_MATCH || 1359 cmpsaddr(iph1->remote, dst) != CMPSADDR_MATCH) && 1360 (cmpsaddr(iph1->local, dst) != CMPSADDR_MATCH || 1361 cmpsaddr(iph1->remote, src) != CMPSADDR_MATCH)) 1362 continue; 1363 1364 /* 1365 * Make sure this is an SATYPE that we manage. 1366 * This is gross; too bad we couldn't do it the 1367 * easy way. 1368 */ 1369 for (i = 0; i < pfkey_nsatypes; i++) { 1370 if (pfkey_satypes[i].ps_satype == 1371 msg->sadb_msg_satype) 1372 break; 1373 } 1374 if (i == pfkey_nsatypes) 1375 continue; 1376 1377 plog(LLV_INFO, LOCATION, NULL, 1378 "purging spi=%u.\n", ntohl(sa->sadb_sa_spi)); 1379 pfkey_send_delete(lcconf->sock_pfkey, 1380 msg->sadb_msg_satype, 1381 IPSEC_MODE_ANY, src, dst, sa->sadb_sa_spi); 1382 1383 /* 1384 * delete a relative phase 2 handler. 1385 * continue to process if no relative phase 2 handler 1386 * exists. 1387 */ 1388 proto_id = pfkey2ipsecdoi_proto(msg->sadb_msg_satype); 1389 iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi); 1390 if (iph2 && iph2 != protectedph2) { 1391 delete_spd(iph2, 0); 1392 remph2(iph2); 1393 delph2(iph2); 1394 } 1395 } 1396 1397 vfree(buf); 1398 return 0; 1399} 1400 1401 1402#ifdef ENABLE_DPD 1403static int 1404isakmp_info_recv_r_u (iph1, ru, msgid) 1405 struct ph1handle *iph1; 1406 struct isakmp_pl_ru *ru; 1407 u_int32_t msgid; 1408{ 1409 struct isakmp_pl_ru *ru_ack; 1410 vchar_t *payload = NULL; 1411 int tlen; 1412 int error = 0; 1413 1414 plog(LLV_DEBUG, LOCATION, iph1->remote, 1415 "DPD R-U-There received\n"); 1416 1417 /* XXX should compare cookies with iph1->index? 1418 Or is this already done by calling function? */ 1419 tlen = sizeof(*ru_ack); 1420 payload = vmalloc(tlen); 1421 if (payload == NULL) { 1422 plog(LLV_ERROR, LOCATION, NULL, 1423 "failed to get buffer to send.\n"); 1424 return errno; 1425 } 1426 1427 ru_ack = (struct isakmp_pl_ru *)payload->v; 1428 ru_ack->h.np = ISAKMP_NPTYPE_NONE; 1429 ru_ack->h.len = htons(tlen); 1430 ru_ack->doi = htonl(IPSEC_DOI); 1431 ru_ack->type = htons(ISAKMP_NTYPE_R_U_THERE_ACK); 1432 ru_ack->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ? */ 1433 ru_ack->spi_size = sizeof(isakmp_index); 1434 memcpy(ru_ack->i_ck, ru->i_ck, sizeof(cookie_t)); 1435 memcpy(ru_ack->r_ck, ru->r_ck, sizeof(cookie_t)); 1436 ru_ack->data = ru->data; 1437 1438 /* XXX Should we do FLAG_A ? */ 1439 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 1440 ISAKMP_FLAG_E); 1441 vfree(payload); 1442 1443 plog(LLV_DEBUG, LOCATION, NULL, "received a valid R-U-THERE, ACK sent\n"); 1444 1445 /* Should we mark tunnel as active ? */ 1446 return error; 1447} 1448 1449static int 1450isakmp_info_recv_r_u_ack (iph1, ru, msgid) 1451 struct ph1handle *iph1; 1452 struct isakmp_pl_ru *ru; 1453 u_int32_t msgid; 1454{ 1455 u_int32_t seq; 1456 1457 plog(LLV_DEBUG, LOCATION, iph1->remote, 1458 "DPD R-U-There-Ack received\n"); 1459 1460 seq = ntohl(ru->data); 1461 if (seq <= iph1->dpd_last_ack || seq > iph1->dpd_seq) { 1462 plog(LLV_ERROR, LOCATION, iph1->remote, 1463 "Wrong DPD sequence number (%d; last_ack=%d, seq=%d).\n", 1464 seq, iph1->dpd_last_ack, iph1->dpd_seq); 1465 return 0; 1466 } 1467 1468 if (memcmp(ru->i_ck, iph1->index.i_ck, sizeof(cookie_t)) || 1469 memcmp(ru->r_ck, iph1->index.r_ck, sizeof(cookie_t))) { 1470 plog(LLV_ERROR, LOCATION, iph1->remote, 1471 "Cookie mismatch in DPD ACK!.\n"); 1472 return 0; 1473 } 1474 1475 iph1->dpd_fails = 0; 1476 iph1->dpd_last_ack = seq; 1477 sched_cancel(&iph1->dpd_r_u); 1478 isakmp_sched_r_u(iph1, 0); 1479 1480 plog(LLV_DEBUG, LOCATION, NULL, "received an R-U-THERE-ACK\n"); 1481 1482 return 0; 1483} 1484 1485 1486 1487 1488/* 1489 * send DPD R-U-THERE payload in Informational exchange. 1490 */ 1491static void 1492isakmp_info_send_r_u(sc) 1493 struct sched *sc; 1494{ 1495 struct ph1handle *iph1 = container_of(sc, struct ph1handle, dpd_r_u); 1496 1497 /* create R-U-THERE payload */ 1498 struct isakmp_pl_ru *ru; 1499 vchar_t *payload = NULL; 1500 int tlen; 1501 int error = 0; 1502 1503 plog(LLV_DEBUG, LOCATION, iph1->remote, "DPD monitoring....\n"); 1504 1505 if (iph1->status == PHASE1ST_EXPIRED) { 1506 /* This can happen after removing tunnels from the 1507 * config file and then reloading. 1508 * Such iph1 have rmconf=NULL, so return before the if 1509 * block below. 1510 */ 1511 return; 1512 } 1513 1514 if (iph1->dpd_fails >= iph1->rmconf->dpd_maxfails) { 1515 1516 plog(LLV_INFO, LOCATION, iph1->remote, 1517 "DPD: remote (ISAKMP-SA spi=%s) seems to be dead.\n", 1518 isakmp_pindex(&iph1->index, 0)); 1519 1520 script_hook(iph1, SCRIPT_PHASE1_DEAD); 1521 evt_phase1(iph1, EVT_PHASE1_DPD_TIMEOUT, NULL); 1522 purge_remote(iph1); 1523 1524 /* Do not reschedule here: phase1 is deleted, 1525 * DPD will be reactivated when a new ph1 will be negociated 1526 */ 1527 return; 1528 } 1529 1530 /* TODO: check recent activity to avoid useless sends... */ 1531 1532 tlen = sizeof(*ru); 1533 payload = vmalloc(tlen); 1534 if (payload == NULL) { 1535 plog(LLV_ERROR, LOCATION, NULL, 1536 "failed to get buffer for payload.\n"); 1537 return; 1538 } 1539 ru = (struct isakmp_pl_ru *)payload->v; 1540 ru->h.np = ISAKMP_NPTYPE_NONE; 1541 ru->h.len = htons(tlen); 1542 ru->doi = htonl(IPSEC_DOI); 1543 ru->type = htons(ISAKMP_NTYPE_R_U_THERE); 1544 ru->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ?*/ 1545 ru->spi_size = sizeof(isakmp_index); 1546 1547 memcpy(ru->i_ck, iph1->index.i_ck, sizeof(cookie_t)); 1548 memcpy(ru->r_ck, iph1->index.r_ck, sizeof(cookie_t)); 1549 1550 if (iph1->dpd_seq == 0) { 1551 /* generate a random seq which is not too big */ 1552 iph1->dpd_seq = iph1->dpd_last_ack = rand() & 0x0fff; 1553 } 1554 1555 iph1->dpd_seq++; 1556 iph1->dpd_fails++; 1557 ru->data = htonl(iph1->dpd_seq); 1558 1559 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0); 1560 vfree(payload); 1561 1562 plog(LLV_DEBUG, LOCATION, iph1->remote, 1563 "DPD R-U-There sent (%d)\n", error); 1564 1565 /* Reschedule the r_u_there with a short delay, 1566 * will be deleted/rescheduled if ACK received before */ 1567 isakmp_sched_r_u(iph1, 1); 1568 1569 plog(LLV_DEBUG, LOCATION, iph1->remote, 1570 "rescheduling send_r_u (%d).\n", iph1->rmconf->dpd_retry); 1571} 1572 1573/* Schedule a new R-U-THERE */ 1574int 1575isakmp_sched_r_u(iph1, retry) 1576 struct ph1handle *iph1; 1577 int retry; 1578{ 1579 if(iph1 == NULL || 1580 iph1->rmconf == NULL) 1581 return 1; 1582 1583 1584 if(iph1->dpd_support == 0 || 1585 iph1->rmconf->dpd_interval == 0) 1586 return 0; 1587 1588 if(retry) 1589 sched_schedule(&iph1->dpd_r_u, iph1->rmconf->dpd_retry, 1590 isakmp_info_send_r_u); 1591 else 1592 sched_schedule(&iph1->dpd_r_u, iph1->rmconf->dpd_interval, 1593 isakmp_info_send_r_u); 1594 1595 return 0; 1596} 1597#endif 1598