1/* $OpenBSD: ike_quick_mode.c,v 1.115 2023/03/31 20:16:55 tb Exp $ */ 2/* $EOM: ike_quick_mode.c,v 1.139 2001/01/26 10:43:17 niklas Exp $ */ 3 4/* 5 * Copyright (c) 1998, 1999, 2000, 2001 Niklas Hallqvist. All rights reserved. 6 * Copyright (c) 1999, 2000, 2001 Angelos D. Keromytis. All rights reserved. 7 * Copyright (c) 2000, 2001, 2004 H�kan Olsson. 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 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30/* 31 * This code was written under funding by Ericsson Radio Systems. 32 */ 33 34#include <stdlib.h> 35#include <string.h> 36 37#include <sys/types.h> 38#include <regex.h> 39#include <keynote.h> 40 41#include "attribute.h" 42#include "conf.h" 43#include "connection.h" 44#include "dh.h" 45#include "doi.h" 46#include "exchange.h" 47#include "hash.h" 48#include "ike_quick_mode.h" 49#include "ipsec.h" 50#include "log.h" 51#include "message.h" 52#include "policy.h" 53#include "prf.h" 54#include "sa.h" 55#include "transport.h" 56#include "util.h" 57#include "key.h" 58#include "x509.h" 59 60static void gen_g_xy(struct message *); 61static int initiator_send_HASH_SA_NONCE(struct message *); 62static int initiator_recv_HASH_SA_NONCE(struct message *); 63static int initiator_send_HASH(struct message *); 64static void post_quick_mode(struct message *); 65static int responder_recv_HASH_SA_NONCE(struct message *); 66static int responder_send_HASH_SA_NONCE(struct message *); 67static int responder_recv_HASH(struct message *); 68 69static int check_policy(struct exchange *, struct sa *, struct sa *); 70 71int (*ike_quick_mode_initiator[])(struct message *) = { 72 initiator_send_HASH_SA_NONCE, 73 initiator_recv_HASH_SA_NONCE, 74 initiator_send_HASH 75}; 76 77int (*ike_quick_mode_responder[])(struct message *) = { 78 responder_recv_HASH_SA_NONCE, 79 responder_send_HASH_SA_NONCE, 80 responder_recv_HASH 81}; 82 83/* How many return values will policy handle -- true/false for now */ 84#define RETVALUES_NUM 2 85 86/* 87 * Given an exchange and our policy, check whether the SA and IDs are 88 * acceptable. 89 */ 90static int 91check_policy(struct exchange *exchange, struct sa *sa, struct sa *isakmp_sa) 92{ 93 char *return_values[RETVALUES_NUM]; 94 char **principal = 0; 95 int i, len, result = 0, nprinc = 0; 96 int *x509_ids = 0, *keynote_ids = 0; 97 unsigned char hashbuf[20]; /* Set to the largest digest result */ 98 struct keynote_deckey dc; 99 X509_NAME *subject; 100 101 /* Do we want to use keynote policies? */ 102 if (ignore_policy || 103 strncmp("yes", conf_get_str("General", "Use-Keynote"), 3)) 104 return 1; 105 106 /* Initialize if necessary -- e.g., if pre-shared key auth was used */ 107 if (isakmp_sa->policy_id < 0) { 108 if ((isakmp_sa->policy_id = kn_init()) == -1) { 109 log_print("check_policy: " 110 "failed to initialize policy session"); 111 return 0; 112 } 113 } 114 /* Add the callback that will handle attributes. */ 115 if (kn_add_action(isakmp_sa->policy_id, ".*", (char *)policy_callback, 116 ENVIRONMENT_FLAG_FUNC | ENVIRONMENT_FLAG_REGEX) == -1) { 117 log_print("check_policy: " 118 "kn_add_action (%d, \".*\", %p, FUNC | REGEX) failed", 119 isakmp_sa->policy_id, policy_callback); 120 kn_close(isakmp_sa->policy_id); 121 isakmp_sa->policy_id = -1; 122 return 0; 123 } 124 if (policy_asserts_num) { 125 keynote_ids = calloc(policy_asserts_num, sizeof *keynote_ids); 126 if (!keynote_ids) { 127 log_error("check_policy: calloc (%d, %lu) failed", 128 policy_asserts_num, 129 (unsigned long)sizeof *keynote_ids); 130 kn_close(isakmp_sa->policy_id); 131 isakmp_sa->policy_id = -1; 132 return 0; 133 } 134 } 135 /* Add the policy assertions */ 136 for (i = 0; i < policy_asserts_num; i++) 137 keynote_ids[i] = kn_add_assertion(isakmp_sa->policy_id, 138 policy_asserts[i], 139 strlen(policy_asserts[i]), ASSERT_FLAG_LOCAL); 140 141 /* Initialize -- we'll let the callback do all the work. */ 142 policy_exchange = exchange; 143 policy_sa = sa; 144 policy_isakmp_sa = isakmp_sa; 145 146 /* Set the return values; true/false for now at least. */ 147 return_values[0] = "false"; /* Order of values in array is 148 * important. */ 149 return_values[1] = "true"; 150 151 /* Create a principal (authorizer) for the SA/ID request. */ 152 switch (isakmp_sa->recv_certtype) { 153 case ISAKMP_CERTENC_NONE: 154 /* 155 * For shared keys, just duplicate the passphrase with the 156 * appropriate prefix tag. 157 */ 158 nprinc = 3; 159 principal = calloc(nprinc, sizeof *principal); 160 if (!principal) { 161 log_error("check_policy: calloc (%d, %lu) failed", 162 nprinc, (unsigned long)sizeof *principal); 163 goto policydone; 164 } 165 len = strlen(isakmp_sa->recv_key) + sizeof "passphrase:"; 166 principal[0] = calloc(len, sizeof(char)); 167 if (!principal[0]) { 168 log_error("check_policy: calloc (%d, %lu) failed", len, 169 (unsigned long)sizeof(char)); 170 goto policydone; 171 } 172 /* 173 * XXX Consider changing the magic hash lengths with 174 * constants. 175 */ 176 strlcpy(principal[0], "passphrase:", len); 177 memcpy(principal[0] + sizeof "passphrase:" - 1, 178 isakmp_sa->recv_key, strlen(isakmp_sa->recv_key)); 179 180 len = sizeof "passphrase-md5-hex:" + 2 * 16; 181 principal[1] = calloc(len, sizeof(char)); 182 if (!principal[1]) { 183 log_error("check_policy: calloc (%d, %lu) failed", len, 184 (unsigned long)sizeof(char)); 185 goto policydone; 186 } 187 strlcpy(principal[1], "passphrase-md5-hex:", len); 188 MD5(isakmp_sa->recv_key, strlen(isakmp_sa->recv_key), hashbuf); 189 for (i = 0; i < 16; i++) 190 snprintf(principal[1] + 2 * i + 191 sizeof "passphrase-md5-hex:" - 1, 3, "%02x", 192 hashbuf[i]); 193 194 len = sizeof "passphrase-sha1-hex:" + 2 * 20; 195 principal[2] = calloc(len, sizeof(char)); 196 if (!principal[2]) { 197 log_error("check_policy: calloc (%d, %lu) failed", len, 198 (unsigned long)sizeof(char)); 199 goto policydone; 200 } 201 strlcpy(principal[2], "passphrase-sha1-hex:", len); 202 SHA1(isakmp_sa->recv_key, strlen(isakmp_sa->recv_key), 203 hashbuf); 204 for (i = 0; i < 20; i++) 205 snprintf(principal[2] + 2 * i + 206 sizeof "passphrase-sha1-hex:" - 1, 3, "%02x", 207 hashbuf[i]); 208 break; 209 210 case ISAKMP_CERTENC_KEYNOTE: 211 nprinc = 1; 212 213 principal = calloc(nprinc, sizeof *principal); 214 if (!principal) { 215 log_error("check_policy: calloc (%d, %lu) failed", 216 nprinc, (unsigned long)sizeof *principal); 217 goto policydone; 218 } 219 /* Dup the keys */ 220 principal[0] = strdup(isakmp_sa->keynote_key); 221 if (!principal[0]) { 222 log_error("check_policy: calloc (%lu, %lu) failed", 223 (unsigned long)strlen(isakmp_sa->keynote_key), 224 (unsigned long)sizeof(char)); 225 goto policydone; 226 } 227 break; 228 229 case ISAKMP_CERTENC_X509_SIG: 230 principal = calloc(2, sizeof *principal); 231 if (!principal) { 232 log_error("check_policy: calloc (2, %lu) failed", 233 (unsigned long)sizeof *principal); 234 goto policydone; 235 } 236 if (isakmp_sa->recv_keytype == ISAKMP_KEY_RSA) 237 dc.dec_algorithm = KEYNOTE_ALGORITHM_RSA; 238 else { 239 log_error("check_policy: " 240 "unknown/unsupported public key algorithm %d", 241 isakmp_sa->recv_keytype); 242 goto policydone; 243 } 244 245 dc.dec_key = isakmp_sa->recv_key; 246 principal[0] = kn_encode_key(&dc, INTERNAL_ENC_PKCS1, 247 ENCODING_HEX, KEYNOTE_PUBLIC_KEY); 248 if (keynote_errno == ERROR_MEMORY) { 249 log_print("check_policy: " 250 "failed to get memory for public key"); 251 goto policydone; 252 } 253 if (!principal[0]) { 254 log_print("check_policy: " 255 "failed to allocate memory for principal"); 256 goto policydone; 257 } 258 if (asprintf(&principal[1], "rsa-hex:%s", principal[0]) == -1) { 259 log_error("check_policy: asprintf() failed"); 260 goto policydone; 261 } 262 free(principal[0]); 263 principal[0] = principal[1]; 264 principal[1] = 0; 265 266 /* Generate a "DN:" principal. */ 267 subject = X509_get_subject_name(isakmp_sa->recv_cert); 268 if (subject) { 269 principal[1] = calloc(259, sizeof(char)); 270 if (!principal[1]) { 271 log_error("check_policy: " 272 "calloc (259, %lu) failed", 273 (unsigned long)sizeof(char)); 274 goto policydone; 275 } 276 strlcpy(principal[1], "DN:", 259); 277 X509_NAME_oneline(subject, principal[1] + 3, 256); 278 nprinc = 2; 279 } else { 280 nprinc = 1; 281 } 282 break; 283 284 /* XXX Eventually handle these. */ 285 case ISAKMP_CERTENC_PKCS: 286 case ISAKMP_CERTENC_PGP: 287 case ISAKMP_CERTENC_DNS: 288 case ISAKMP_CERTENC_X509_KE: 289 case ISAKMP_CERTENC_KERBEROS: 290 case ISAKMP_CERTENC_CRL: 291 case ISAKMP_CERTENC_ARL: 292 case ISAKMP_CERTENC_SPKI: 293 case ISAKMP_CERTENC_X509_ATTR: 294 default: 295 log_print("check_policy: " 296 "unknown/unsupported certificate/authentication method %d", 297 isakmp_sa->recv_certtype); 298 goto policydone; 299 } 300 301 /* 302 * Add the authorizer (who is requesting the SA/ID); 303 * this may be a public or a secret key, depending on 304 * what mode of authentication we used in Phase 1. 305 */ 306 for (i = 0; i < nprinc; i++) { 307 LOG_DBG((LOG_POLICY, 40, "check_policy: " 308 "adding authorizer [%s]", principal[i])); 309 310 if (kn_add_authorizer(isakmp_sa->policy_id, principal[i]) 311 == -1) { 312 int j; 313 314 for (j = 0; j < i; j++) 315 kn_remove_authorizer(isakmp_sa->policy_id, 316 principal[j]); 317 log_print("check_policy: kn_add_authorizer failed"); 318 goto policydone; 319 } 320 } 321 322 /* Ask policy */ 323 result = kn_do_query(isakmp_sa->policy_id, return_values, 324 RETVALUES_NUM); 325 LOG_DBG((LOG_POLICY, 40, "check_policy: kn_do_query returned %d", 326 result)); 327 328 /* Cleanup environment */ 329 kn_cleanup_action_environment(isakmp_sa->policy_id); 330 331 /* Remove authorizers from the session */ 332 for (i = 0; i < nprinc; i++) { 333 kn_remove_authorizer(isakmp_sa->policy_id, principal[i]); 334 free(principal[i]); 335 } 336 337 free(principal); 338 principal = 0; 339 nprinc = 0; 340 341 /* Check what policy said. */ 342 if (result < 0) { 343 LOG_DBG((LOG_POLICY, 40, "check_policy: proposal refused")); 344 result = 0; 345 goto policydone; 346 } 347policydone: 348 for (i = 0; i < nprinc; i++) 349 if (principal && principal[i]) 350 free(principal[i]); 351 352 free(principal); 353 354 /* Remove the policies */ 355 for (i = 0; i < policy_asserts_num; i++) { 356 if (keynote_ids[i] != -1) 357 kn_remove_assertion(isakmp_sa->policy_id, 358 keynote_ids[i]); 359 } 360 361 free(keynote_ids); 362 363 free(x509_ids); 364 365 /* 366 * XXX Currently, check_policy() is only called from 367 * message_negotiate_sa(), and so this log message reflects this. 368 * Change to something better? 369 */ 370 if (result == 0) 371 log_print("check_policy: negotiated SA failed policy check"); 372 373 /* 374 * Given that we have only 2 return values from policy (true/false) 375 * we can just return the query result directly (no pre-processing 376 * needed). 377 */ 378 return result; 379} 380 381/* 382 * Offer several sets of transforms to the responder. 383 * XXX Split this huge function up and look for common code with main mode. 384 */ 385static int 386initiator_send_HASH_SA_NONCE(struct message *msg) 387{ 388 struct exchange *exchange = msg->exchange; 389 struct doi *doi = exchange->doi; 390 struct ipsec_exch *ie = exchange->data; 391 u_int8_t ***transform = 0, ***new_transform; 392 u_int8_t **proposal = 0, **new_proposal; 393 u_int8_t *sa_buf = 0, *attr, *saved_nextp_sa, *saved_nextp_prop, 394 *id, *spi; 395 size_t spi_sz, sz; 396 size_t proposal_len = 0, proposals_len = 0, sa_len; 397 size_t **transform_len = 0, **new_transform_len; 398 size_t *transforms_len = 0, *new_transforms_len; 399 u_int32_t *transform_cnt = 0, *new_transform_cnt; 400 u_int32_t suite_no, prop_no, prot_no, xf_no, prop_cnt = 0; 401 u_int32_t i; 402 int value, update_nextp, protocol_num, proto_id; 403 struct proto *proto; 404 struct conf_list *suite_conf, *prot_conf = 0, *xf_conf = 0, *life_conf; 405 struct conf_list_node *suite, *prot, *xf, *life; 406 struct constant_map *id_map; 407 char *protocol_id, *transform_id; 408 char *local_id, *remote_id; 409 char *name; 410 int group_desc = -1, new_group_desc; 411 struct ipsec_sa *isa = msg->isakmp_sa->data; 412 struct hash *hash = hash_get(isa->hash); 413 struct sockaddr *src; 414 struct proto_attr *pa; 415 416 if (!ipsec_add_hash_payload(msg, hash->hashsize)) 417 return -1; 418 419 /* Get the list of protocol suites. */ 420 suite_conf = conf_get_list(exchange->policy, "Suites"); 421 if (!suite_conf) 422 return -1; 423 424 for (suite = TAILQ_FIRST(&suite_conf->fields), suite_no = prop_no = 0; 425 suite_no < suite_conf->cnt; 426 suite_no++, suite = TAILQ_NEXT(suite, link)) { 427 /* Now get each protocol in this specific protocol suite. */ 428 prot_conf = conf_get_list(suite->field, "Protocols"); 429 if (!prot_conf) 430 goto bail_out; 431 432 for (prot = TAILQ_FIRST(&prot_conf->fields), prot_no = 0; 433 prot_no < prot_conf->cnt; 434 prot_no++, prot = TAILQ_NEXT(prot, link)) { 435 /* Make sure we have a proposal/transform vectors. */ 436 if (prop_no >= prop_cnt) { 437 /* 438 * This resize algorithm is completely 439 * arbitrary. 440 */ 441 prop_cnt = 2 * prop_cnt + 10; 442 new_proposal = reallocarray(proposal, 443 prop_cnt, sizeof *proposal); 444 if (!new_proposal) { 445 log_error( 446 "initiator_send_HASH_SA_NONCE: " 447 "realloc (%p, %lu) failed", 448 proposal, 449 prop_cnt * (unsigned long)sizeof *proposal); 450 goto bail_out; 451 } 452 proposal = new_proposal; 453 454 new_transforms_len = reallocarray(transforms_len, 455 prop_cnt, sizeof *transforms_len); 456 if (!new_transforms_len) { 457 log_error( 458 "initiator_send_HASH_SA_NONCE: " 459 "realloc (%p, %lu) failed", 460 transforms_len, 461 prop_cnt * (unsigned long)sizeof *transforms_len); 462 goto bail_out; 463 } 464 transforms_len = new_transforms_len; 465 466 new_transform = reallocarray(transform, 467 prop_cnt, sizeof *transform); 468 if (!new_transform) { 469 log_error( 470 "initiator_send_HASH_SA_NONCE: " 471 "realloc (%p, %lu) failed", 472 transform, 473 prop_cnt * (unsigned long)sizeof *transform); 474 goto bail_out; 475 } 476 transform = new_transform; 477 478 new_transform_cnt = reallocarray(transform_cnt, 479 prop_cnt, sizeof *transform_cnt); 480 if (!new_transform_cnt) { 481 log_error( 482 "initiator_send_HASH_SA_NONCE: " 483 "realloc (%p, %lu) failed", 484 transform_cnt, 485 prop_cnt * (unsigned long)sizeof *transform_cnt); 486 goto bail_out; 487 } 488 transform_cnt = new_transform_cnt; 489 490 new_transform_len = reallocarray(transform_len, 491 prop_cnt, sizeof *transform_len); 492 if (!new_transform_len) { 493 log_error( 494 "initiator_send_HASH_SA_NONCE: " 495 "realloc (%p, %lu) failed", 496 transform_len, 497 prop_cnt * (unsigned long)sizeof *transform_len); 498 goto bail_out; 499 } 500 transform_len = new_transform_len; 501 } 502 protocol_id = conf_get_str(prot->field, "PROTOCOL_ID"); 503 if (!protocol_id) 504 goto bail_out; 505 506 proto_id = constant_value(ipsec_proto_cst, 507 protocol_id); 508 switch (proto_id) { 509 case IPSEC_PROTO_IPSEC_AH: 510 id_map = ipsec_ah_cst; 511 break; 512 513 case IPSEC_PROTO_IPSEC_ESP: 514 id_map = ipsec_esp_cst; 515 break; 516 517 case IPSEC_PROTO_IPCOMP: 518 id_map = ipsec_ipcomp_cst; 519 break; 520 521 default: 522 { 523 log_print("initiator_send_HASH_SA_NONCE: " 524 "invalid PROTCOL_ID: %s", protocol_id); 525 goto bail_out; 526 } 527 } 528 529 /* Now get each transform we offer for this protocol.*/ 530 xf_conf = conf_get_list(prot->field, "Transforms"); 531 if (!xf_conf) 532 goto bail_out; 533 transform_cnt[prop_no] = xf_conf->cnt; 534 535 transform[prop_no] = calloc(transform_cnt[prop_no], 536 sizeof **transform); 537 if (!transform[prop_no]) { 538 log_error("initiator_send_HASH_SA_NONCE: " 539 "calloc (%d, %lu) failed", 540 transform_cnt[prop_no], 541 (unsigned long)sizeof **transform); 542 goto bail_out; 543 } 544 transform_len[prop_no] = calloc(transform_cnt[prop_no], 545 sizeof **transform_len); 546 if (!transform_len[prop_no]) { 547 log_error("initiator_send_HASH_SA_NONCE: " 548 "calloc (%d, %lu) failed", 549 transform_cnt[prop_no], 550 (unsigned long)sizeof **transform_len); 551 goto bail_out; 552 } 553 transforms_len[prop_no] = 0; 554 for (xf = TAILQ_FIRST(&xf_conf->fields), xf_no = 0; 555 xf_no < transform_cnt[prop_no]; 556 xf_no++, xf = TAILQ_NEXT(xf, link)) { 557 558 /* XXX The sizing needs to be dynamic. */ 559 transform[prop_no][xf_no] = 560 calloc(ISAKMP_TRANSFORM_SA_ATTRS_OFF + 561 9 * ISAKMP_ATTR_VALUE_OFF, 1); 562 if (!transform[prop_no][xf_no]) { 563 log_error( 564 "initiator_send_HASH_SA_NONCE: " 565 "calloc (%d, 1) failed", 566 ISAKMP_TRANSFORM_SA_ATTRS_OFF + 567 9 * ISAKMP_ATTR_VALUE_OFF); 568 goto bail_out; 569 } 570 SET_ISAKMP_TRANSFORM_NO(transform[prop_no][xf_no], 571 xf_no + 1); 572 573 transform_id = conf_get_str(xf->field, 574 "TRANSFORM_ID"); 575 if (!transform_id) 576 goto bail_out; 577 SET_ISAKMP_TRANSFORM_ID(transform[prop_no][xf_no], 578 constant_value(id_map, transform_id)); 579 SET_ISAKMP_TRANSFORM_RESERVED(transform[prop_no][xf_no], 0); 580 581 attr = transform[prop_no][xf_no] + 582 ISAKMP_TRANSFORM_SA_ATTRS_OFF; 583 584 /* 585 * Life durations are special, we should be 586 * able to specify several, one per type. 587 */ 588 life_conf = conf_get_list(xf->field, "Life"); 589 if (life_conf) { 590 for (life = TAILQ_FIRST(&life_conf->fields); 591 life; life = TAILQ_NEXT(life, link)) { 592 attribute_set_constant( 593 life->field, "LIFE_TYPE", 594 ipsec_duration_cst, 595 IPSEC_ATTR_SA_LIFE_TYPE, 596 &attr); 597 598 /* 599 * XXX Deals with 16 and 32 600 * bit lifetimes only 601 */ 602 value = 603 conf_get_num(life->field, 604 "LIFE_DURATION", 0); 605 if (value) { 606 if (value <= 0xffff) 607 attr = 608 attribute_set_basic( 609 attr, 610 IPSEC_ATTR_SA_LIFE_DURATION, 611 value); 612 else { 613 value = htonl(value); 614 attr = 615 attribute_set_var( 616 attr, 617 IPSEC_ATTR_SA_LIFE_DURATION, 618 (u_int8_t *)&value, 619 sizeof value); 620 } 621 } 622 } 623 conf_free_list(life_conf); 624 } 625 626 if (proto_id == IPSEC_PROTO_IPSEC_ESP && 627 (exchange->flags & 628 EXCHANGE_FLAG_NAT_T_ENABLE)) { 629 name = conf_get_str(xf->field, 630 "ENCAPSULATION_MODE"); 631 if (name) { 632 value = constant_value( 633 ipsec_encap_cst, 634 name); 635 switch (value) { 636 case IPSEC_ENCAP_TUNNEL: 637 value = exchange->flags & EXCHANGE_FLAG_NAT_T_DRAFT ? 638 IPSEC_ENCAP_UDP_ENCAP_TUNNEL_DRAFT : 639 IPSEC_ENCAP_UDP_ENCAP_TUNNEL; 640 break; 641 case IPSEC_ENCAP_TRANSPORT: 642 value = exchange->flags & EXCHANGE_FLAG_NAT_T_DRAFT ? 643 IPSEC_ENCAP_UDP_ENCAP_TRANSPORT_DRAFT : 644 IPSEC_ENCAP_UDP_ENCAP_TRANSPORT; 645 break; 646 } 647 attr = attribute_set_basic( 648 attr, 649 IPSEC_ATTR_ENCAPSULATION_MODE, 650 value); 651 } 652 } else { 653 attribute_set_constant(xf->field, 654 "ENCAPSULATION_MODE", 655 ipsec_encap_cst, 656 IPSEC_ATTR_ENCAPSULATION_MODE, 657 &attr); 658 } 659 660 if (proto_id != IPSEC_PROTO_IPCOMP) { 661 attribute_set_constant(xf->field, 662 "AUTHENTICATION_ALGORITHM", 663 ipsec_auth_cst, 664 IPSEC_ATTR_AUTHENTICATION_ALGORITHM, 665 &attr); 666 667 attribute_set_constant(xf->field, 668 "GROUP_DESCRIPTION", 669 ike_group_desc_cst, 670 IPSEC_ATTR_GROUP_DESCRIPTION, &attr); 671 672 value = conf_get_num(xf->field, 673 "KEY_LENGTH", 0); 674 if (value) 675 attr = attribute_set_basic( 676 attr, 677 IPSEC_ATTR_KEY_LENGTH, 678 value); 679 680 value = conf_get_num(xf->field, 681 "KEY_ROUNDS", 0); 682 if (value) 683 attr = attribute_set_basic( 684 attr, 685 IPSEC_ATTR_KEY_ROUNDS, 686 value); 687 } else { 688 value = conf_get_num(xf->field, 689 "COMPRESS_DICTIONARY_SIZE", 0); 690 if (value) 691 attr = attribute_set_basic( 692 attr, 693 IPSEC_ATTR_COMPRESS_DICTIONARY_SIZE, 694 value); 695 696 value = conf_get_num(xf->field, 697 "COMPRESS_PRIVATE_ALGORITHM", 0); 698 if (value) 699 attr = attribute_set_basic( 700 attr, 701 IPSEC_ATTR_COMPRESS_PRIVATE_ALGORITHM, 702 value); 703 } 704 705 value = conf_get_num(xf->field, "ECN_TUNNEL", 706 0); 707 if (value) 708 attr = attribute_set_basic(attr, 709 IPSEC_ATTR_ECN_TUNNEL, value); 710 711 /* Record the real transform size. */ 712 transforms_len[prop_no] += 713 (transform_len[prop_no][xf_no] 714 = attr - transform[prop_no][xf_no]); 715 716 if (proto_id != IPSEC_PROTO_IPCOMP) { 717 /* 718 * Make sure that if a group 719 * description is specified, it is 720 * specified for all transforms 721 * equally. 722 */ 723 attr = 724 (u_int8_t *)conf_get_str(xf->field, 725 "GROUP_DESCRIPTION"); 726 new_group_desc 727 = attr ? constant_value(ike_group_desc_cst, 728 (char *)attr) : 0; 729 if (group_desc == -1) 730 group_desc = new_group_desc; 731 else if (group_desc != new_group_desc) { 732 log_print("initiator_send_HASH_SA_NONCE: " 733 "differing group descriptions in a proposal"); 734 goto bail_out; 735 } 736 } 737 } 738 conf_free_list(xf_conf); 739 xf_conf = 0; 740 741 /* 742 * Get SPI from application. 743 * XXX Should we care about unknown constants? 744 */ 745 protocol_num = constant_value(ipsec_proto_cst, 746 protocol_id); 747 spi = doi->get_spi(&spi_sz, protocol_num, msg); 748 if (spi_sz && !spi) { 749 log_print("initiator_send_HASH_SA_NONCE: " 750 "doi->get_spi failed"); 751 goto bail_out; 752 } 753 proposal_len = ISAKMP_PROP_SPI_OFF + spi_sz; 754 proposals_len += 755 proposal_len + transforms_len[prop_no]; 756 proposal[prop_no] = malloc(proposal_len); 757 if (!proposal[prop_no]) { 758 log_error("initiator_send_HASH_SA_NONCE: " 759 "malloc (%lu) failed", 760 (unsigned long)proposal_len); 761 goto bail_out; 762 } 763 SET_ISAKMP_PROP_NO(proposal[prop_no], suite_no + 1); 764 SET_ISAKMP_PROP_PROTO(proposal[prop_no], protocol_num); 765 766 /* XXX I would like to see this factored out. */ 767 proto = calloc(1, sizeof *proto); 768 if (!proto) { 769 log_error("initiator_send_HASH_SA_NONCE: " 770 "calloc (1, %lu) failed", 771 (unsigned long)sizeof *proto); 772 goto bail_out; 773 } 774 if (doi->proto_size) { 775 proto->data = calloc(1, doi->proto_size); 776 if (!proto->data) { 777 free(proto); 778 log_error( 779 "initiator_send_HASH_SA_NONCE: " 780 "calloc (1, %lu) failed", 781 (unsigned long)doi->proto_size); 782 goto bail_out; 783 } 784 } 785 proto->no = suite_no + 1; 786 proto->proto = protocol_num; 787 proto->sa = TAILQ_FIRST(&exchange->sa_list); 788 proto->xf_cnt = transform_cnt[prop_no]; 789 TAILQ_INIT(&proto->xfs); 790 for (xf_no = 0; xf_no < proto->xf_cnt; xf_no++) { 791 pa = calloc(1, sizeof *pa); 792 if (!pa) { 793 free(proto->data); 794 free(proto); 795 goto bail_out; 796 } 797 pa->len = transform_len[prop_no][xf_no]; 798 pa->attrs = malloc(pa->len); 799 if (!pa->attrs) { 800 free(proto->data); 801 free(proto); 802 free(pa); 803 goto bail_out; 804 } 805 memcpy(pa->attrs, transform[prop_no][xf_no], 806 pa->len); 807 TAILQ_INSERT_TAIL(&proto->xfs, pa, next); 808 } 809 TAILQ_INSERT_TAIL(&TAILQ_FIRST(&exchange->sa_list)->protos, 810 proto, link); 811 812 /* Setup the incoming SPI. */ 813 SET_ISAKMP_PROP_SPI_SZ(proposal[prop_no], spi_sz); 814 memcpy(proposal[prop_no] + ISAKMP_PROP_SPI_OFF, spi, 815 spi_sz); 816 proto->spi_sz[1] = spi_sz; 817 proto->spi[1] = spi; 818 819 /* 820 * Let the DOI get at proto for initializing its own 821 * data. 822 */ 823 if (doi->proto_init) 824 doi->proto_init(proto, prot->field); 825 826 SET_ISAKMP_PROP_NTRANSFORMS(proposal[prop_no], 827 transform_cnt[prop_no]); 828 prop_no++; 829 } 830 conf_free_list(prot_conf); 831 prot_conf = 0; 832 } 833 834 sa_len = ISAKMP_SA_SIT_OFF + IPSEC_SIT_SIT_LEN; 835 sa_buf = malloc(sa_len); 836 if (!sa_buf) { 837 log_error("initiator_send_HASH_SA_NONCE: malloc (%lu) failed", 838 (unsigned long)sa_len); 839 goto bail_out; 840 } 841 SET_ISAKMP_SA_DOI(sa_buf, IPSEC_DOI_IPSEC); 842 SET_IPSEC_SIT_SIT(sa_buf + ISAKMP_SA_SIT_OFF, IPSEC_SIT_IDENTITY_ONLY); 843 844 /* 845 * Add the payloads. As this is a SA, we need to recompute the 846 * lengths of the payloads containing others. We also need to 847 * reset these payload's "next payload type" field. 848 */ 849 if (message_add_payload(msg, ISAKMP_PAYLOAD_SA, sa_buf, sa_len, 1)) 850 goto bail_out; 851 SET_ISAKMP_GEN_LENGTH(sa_buf, sa_len + proposals_len); 852 sa_buf = 0; 853 854 update_nextp = 0; 855 saved_nextp_sa = msg->nextp; 856 for (i = 0; i < prop_no; i++) { 857 if (message_add_payload(msg, ISAKMP_PAYLOAD_PROPOSAL, 858 proposal[i], proposal_len, update_nextp)) 859 goto bail_out; 860 SET_ISAKMP_GEN_LENGTH(proposal[i], 861 proposal_len + transforms_len[i]); 862 proposal[i] = 0; 863 864 update_nextp = 0; 865 saved_nextp_prop = msg->nextp; 866 for (xf_no = 0; xf_no < transform_cnt[i]; xf_no++) { 867 if (message_add_payload(msg, ISAKMP_PAYLOAD_TRANSFORM, 868 transform[i][xf_no], 869 transform_len[i][xf_no], update_nextp)) 870 goto bail_out; 871 update_nextp = 1; 872 transform[i][xf_no] = 0; 873 } 874 msg->nextp = saved_nextp_prop; 875 update_nextp = 1; 876 } 877 msg->nextp = saved_nextp_sa; 878 879 /* 880 * Save SA payload body in ie->sa_i_b, length ie->sa_i_b_len. 881 */ 882 ie->sa_i_b = message_copy(msg, ISAKMP_GEN_SZ, &ie->sa_i_b_len); 883 if (!ie->sa_i_b) 884 goto bail_out; 885 886 /* 887 * Generate a nonce, and add it to the message. 888 * XXX I want a better way to specify the nonce's size. 889 */ 890 if (exchange_gen_nonce(msg, 16)) 891 return -1; 892 893 /* Generate optional KEY_EXCH payload. */ 894 if (group_desc > 0) { 895 ie->group = group_get(group_desc); 896 if (!ie->group) 897 return -1; 898 ie->g_x_len = dh_getlen(ie->group); 899 900 if (ipsec_gen_g_x(msg)) { 901 group_free(ie->group); 902 ie->group = 0; 903 return -1; 904 } 905 } 906 /* Generate optional client ID payloads. XXX Share with responder. */ 907 local_id = conf_get_str(exchange->name, "Local-ID"); 908 remote_id = conf_get_str(exchange->name, "Remote-ID"); 909 if (local_id && remote_id) { 910 id = ipsec_build_id(local_id, &sz); 911 if (!id) 912 return -1; 913 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 914 "initiator_send_HASH_SA_NONCE: IDic", id, sz)); 915 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 916 free(id); 917 return -1; 918 } 919 id = ipsec_build_id(remote_id, &sz); 920 if (!id) 921 return -1; 922 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 923 "initiator_send_HASH_SA_NONCE: IDrc", id, sz)); 924 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 925 free(id); 926 return -1; 927 } 928 } 929 /* XXX I do not judge these as errors, are they? */ 930 else if (local_id) 931 log_print("initiator_send_HASH_SA_NONCE: " 932 "Local-ID given without Remote-ID for \"%s\"", 933 exchange->name); 934 else if (remote_id) 935 /* 936 * This code supports the "road warrior" case, where the 937 * initiator doesn't have a fixed IP address, but wants to 938 * specify a particular remote network to talk to. -- Adrian 939 * Close <adrian@esec.com.au> 940 */ 941 { 942 log_print("initiator_send_HASH_SA_NONCE: " 943 "Remote-ID given without Local-ID for \"%s\"", 944 exchange->name); 945 946 /* 947 * If we're here, then we are the initiator, so use initiator 948 * address for local ID 949 */ 950 msg->transport->vtbl->get_src(msg->transport, &src); 951 sz = ISAKMP_ID_SZ + sockaddr_addrlen(src); 952 953 id = calloc(sz, sizeof(char)); 954 if (!id) { 955 log_error("initiator_send_HASH_SA_NONCE: " 956 "calloc (%lu, %lu) failed", (unsigned long)sz, 957 (unsigned long)sizeof(char)); 958 return -1; 959 } 960 switch (src->sa_family) { 961 case AF_INET6: 962 SET_ISAKMP_ID_TYPE(id, IPSEC_ID_IPV6_ADDR); 963 break; 964 case AF_INET: 965 SET_ISAKMP_ID_TYPE(id, IPSEC_ID_IPV4_ADDR); 966 break; 967 default: 968 log_error("initiator_send_HASH_SA_NONCE: " 969 "unknown sa_family %d", src->sa_family); 970 free(id); 971 return -1; 972 } 973 memcpy(id + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), 974 sockaddr_addrlen(src)); 975 976 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 977 "initiator_send_HASH_SA_NONCE: IDic", id, sz)); 978 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 979 free(id); 980 return -1; 981 } 982 /* Send supplied remote_id */ 983 id = ipsec_build_id(remote_id, &sz); 984 if (!id) 985 return -1; 986 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 987 "initiator_send_HASH_SA_NONCE: IDrc", id, sz)); 988 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 989 free(id); 990 return -1; 991 } 992 } 993 if (ipsec_fill_in_hash(msg)) 994 goto bail_out; 995 996 conf_free_list(suite_conf); 997 for (i = 0; i < prop_no; i++) { 998 free(transform[i]); 999 free(transform_len[i]); 1000 } 1001 free(proposal); 1002 free(transform); 1003 free(transforms_len); 1004 free(transform_len); 1005 free(transform_cnt); 1006 return 0; 1007 1008bail_out: 1009 free(sa_buf); 1010 if (proposal) { 1011 for (i = 0; i < prop_no; i++) { 1012 free(proposal[i]); 1013 if (transform[i]) { 1014 for (xf_no = 0; xf_no < transform_cnt[i]; 1015 xf_no++) 1016 free(transform[i][xf_no]); 1017 free(transform[i]); 1018 } 1019 free(transform_len[i]); 1020 } 1021 free(proposal); 1022 free(transforms_len); 1023 free(transform); 1024 free(transform_len); 1025 free(transform_cnt); 1026 } 1027 if (xf_conf) 1028 conf_free_list(xf_conf); 1029 if (prot_conf) 1030 conf_free_list(prot_conf); 1031 conf_free_list(suite_conf); 1032 return -1; 1033} 1034 1035/* Figure out what transform the responder chose. */ 1036static int 1037initiator_recv_HASH_SA_NONCE(struct message *msg) 1038{ 1039 struct exchange *exchange = msg->exchange; 1040 struct ipsec_exch *ie = exchange->data; 1041 struct sa *sa; 1042 struct proto *proto, *next_proto; 1043 struct payload *sa_p = payload_first(msg, ISAKMP_PAYLOAD_SA); 1044 struct payload *xf, *idp; 1045 struct payload *hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); 1046 struct payload *kep = payload_first(msg, ISAKMP_PAYLOAD_KEY_EXCH); 1047 struct prf *prf; 1048 struct sa *isakmp_sa = msg->isakmp_sa; 1049 struct ipsec_sa *isa = isakmp_sa->data; 1050 struct hash *hash = hash_get(isa->hash); 1051 u_int8_t *rest; 1052 size_t rest_len; 1053 struct sockaddr *src, *dst; 1054 1055 /* Allocate the prf and start calculating our HASH(1). XXX Share? */ 1056 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: " 1057 "SKEYID_a", (u_int8_t *)isa->skeyid_a, isa->skeyid_len)); 1058 prf = prf_alloc(isa->prf_type, hash->type, isa->skeyid_a, 1059 isa->skeyid_len); 1060 if (!prf) 1061 return -1; 1062 1063 prf->Init(prf->prfctx); 1064 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1065 "initiator_recv_HASH_SA_NONCE: message_id", 1066 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1067 prf->Update(prf->prfctx, exchange->message_id, 1068 ISAKMP_HDR_MESSAGE_ID_LEN); 1069 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: " 1070 "NONCE_I_b", exchange->nonce_i, exchange->nonce_i_len)); 1071 prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); 1072 rest = hashp->p + GET_ISAKMP_GEN_LENGTH(hashp->p); 1073 rest_len = (GET_ISAKMP_HDR_LENGTH(msg->iov[0].iov_base) 1074 - (rest - (u_int8_t *)msg->iov[0].iov_base)); 1075 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1076 "initiator_recv_HASH_SA_NONCE: payloads after HASH(2)", rest, 1077 rest_len)); 1078 prf->Update(prf->prfctx, rest, rest_len); 1079 prf->Final(hash->digest, prf->prfctx); 1080 prf_free(prf); 1081 LOG_DBG_BUF((LOG_NEGOTIATION, 80, 1082 "initiator_recv_HASH_SA_NONCE: computed HASH(2)", hash->digest, 1083 hash->hashsize)); 1084 if (memcmp(hashp->p + ISAKMP_HASH_DATA_OFF, hash->digest, 1085 hash->hashsize) != 0) { 1086 message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1, 1087 0); 1088 return -1; 1089 } 1090 /* Mark the HASH as handled. */ 1091 hashp->flags |= PL_MARK; 1092 1093 /* Mark message as authenticated. */ 1094 msg->flags |= MSG_AUTHENTICATED; 1095 1096 /* 1097 * As we are getting an answer on our transform offer, only one 1098 * transform should be given. 1099 * 1100 * XXX Currently we only support negotiating one SA per quick mode run. 1101 */ 1102 if (TAILQ_NEXT(sa_p, link)) { 1103 log_print("initiator_recv_HASH_SA_NONCE: " 1104 "multiple SA payloads in quick mode not supported yet"); 1105 return -1; 1106 } 1107 sa = TAILQ_FIRST(&exchange->sa_list); 1108 1109 /* This is here for the policy check */ 1110 if (kep) 1111 ie->pfs = 1; 1112 1113 /* Drop message when it contains ID types we do not implement yet. */ 1114 TAILQ_FOREACH(idp, &msg->payload[ISAKMP_PAYLOAD_ID], link) { 1115 switch (GET_ISAKMP_ID_TYPE(idp->p)) { 1116 case IPSEC_ID_IPV4_ADDR: 1117 case IPSEC_ID_IPV4_ADDR_SUBNET: 1118 case IPSEC_ID_IPV6_ADDR: 1119 case IPSEC_ID_IPV6_ADDR_SUBNET: 1120 break; 1121 1122 case IPSEC_ID_FQDN: 1123 /* 1124 * FQDN may be used for in NAT-T with transport mode. 1125 * We can handle the message in this case. In the 1126 * other cases we'll drop the message later. 1127 */ 1128 break; 1129 1130 default: 1131 message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 1132 0, 1, 0); 1133 return -1; 1134 } 1135 } 1136 1137 /* Handle optional client ID payloads. */ 1138 idp = payload_first(msg, ISAKMP_PAYLOAD_ID); 1139 if (idp) { 1140 /* If IDci is there, IDcr must be too. */ 1141 if (!TAILQ_NEXT(idp, link)) { 1142 /* XXX Is this a good notify type? */ 1143 message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1144 1, 0); 1145 return -1; 1146 } 1147 /* XXX We should really compare, not override. */ 1148 ie->id_ci_sz = GET_ISAKMP_GEN_LENGTH(idp->p); 1149 ie->id_ci = malloc(ie->id_ci_sz); 1150 if (!ie->id_ci) { 1151 log_error("initiator_recv_HASH_SA_NONCE: " 1152 "malloc (%lu) failed", 1153 (unsigned long)ie->id_ci_sz); 1154 return -1; 1155 } 1156 memcpy(ie->id_ci, idp->p, ie->id_ci_sz); 1157 idp->flags |= PL_MARK; 1158 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1159 "initiator_recv_HASH_SA_NONCE: IDci", 1160 ie->id_ci + ISAKMP_GEN_SZ, ie->id_ci_sz - ISAKMP_GEN_SZ)); 1161 1162 idp = TAILQ_NEXT(idp, link); 1163 ie->id_cr_sz = GET_ISAKMP_GEN_LENGTH(idp->p); 1164 ie->id_cr = malloc(ie->id_cr_sz); 1165 if (!ie->id_cr) { 1166 log_error("initiator_recv_HASH_SA_NONCE: " 1167 "malloc (%lu) failed", 1168 (unsigned long)ie->id_cr_sz); 1169 return -1; 1170 } 1171 memcpy(ie->id_cr, idp->p, ie->id_cr_sz); 1172 idp->flags |= PL_MARK; 1173 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1174 "initiator_recv_HASH_SA_NONCE: IDcr", 1175 ie->id_cr + ISAKMP_GEN_SZ, ie->id_cr_sz - ISAKMP_GEN_SZ)); 1176 } else { 1177 /* 1178 * If client identifiers are not present in the exchange, 1179 * we fake them. RFC 2409 states: 1180 * The identities of the SAs negotiated in Quick Mode are 1181 * implicitly assumed to be the IP addresses of the ISAKMP 1182 * peers, without any constraints on the protocol or port 1183 * numbers allowed, unless client identifiers are specified 1184 * in Quick Mode. 1185 * 1186 * -- Michael Paddon (mwp@aba.net.au) 1187 */ 1188 1189 ie->flags = IPSEC_EXCH_FLAG_NO_ID; 1190 1191 /* Get initiator and responder addresses. */ 1192 msg->transport->vtbl->get_src(msg->transport, &src); 1193 msg->transport->vtbl->get_dst(msg->transport, &dst); 1194 ie->id_ci_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(src); 1195 ie->id_cr_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(dst); 1196 ie->id_ci = calloc(ie->id_ci_sz, sizeof(char)); 1197 ie->id_cr = calloc(ie->id_cr_sz, sizeof(char)); 1198 1199 if (!ie->id_ci || !ie->id_cr) { 1200 log_error("initiator_recv_HASH_SA_NONCE: " 1201 "calloc (%lu, %lu) failed", 1202 (unsigned long)ie->id_cr_sz, 1203 (unsigned long)sizeof(char)); 1204 free(ie->id_ci); 1205 ie->id_ci = 0; 1206 free(ie->id_cr); 1207 ie->id_cr = 0; 1208 return -1; 1209 } 1210 if (src->sa_family != dst->sa_family) { 1211 log_error("initiator_recv_HASH_SA_NONCE: " 1212 "sa_family mismatch"); 1213 free(ie->id_ci); 1214 ie->id_ci = 0; 1215 free(ie->id_cr); 1216 ie->id_cr = 0; 1217 return -1; 1218 } 1219 switch (src->sa_family) { 1220 case AF_INET: 1221 SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV4_ADDR); 1222 SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV4_ADDR); 1223 break; 1224 1225 case AF_INET6: 1226 SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV6_ADDR); 1227 SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV6_ADDR); 1228 break; 1229 1230 default: 1231 log_error("initiator_recv_HASH_SA_NONCE: " 1232 "unknown sa_family %d", src->sa_family); 1233 free(ie->id_ci); 1234 ie->id_ci = 0; 1235 free(ie->id_cr); 1236 ie->id_cr = 0; 1237 return -1; 1238 } 1239 memcpy(ie->id_ci + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), 1240 sockaddr_addrlen(src)); 1241 memcpy(ie->id_cr + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(dst), 1242 sockaddr_addrlen(dst)); 1243 } 1244 1245 /* Build the protection suite in our SA. */ 1246 TAILQ_FOREACH(xf, &msg->payload[ISAKMP_PAYLOAD_TRANSFORM], link) { 1247 /* 1248 * XXX We could check that the proposal each transform 1249 * belongs to is unique. 1250 */ 1251 1252 if (sa_add_transform(sa, xf, exchange->initiator, &proto)) 1253 return -1; 1254 1255 /* XXX Check that the chosen transform matches an offer. */ 1256 1257 ipsec_decode_transform(msg, sa, proto, xf->p); 1258 } 1259 1260 /* Now remove offers that we don't need anymore. */ 1261 for (proto = TAILQ_FIRST(&sa->protos); proto; proto = next_proto) { 1262 next_proto = TAILQ_NEXT(proto, link); 1263 if (!proto->chosen) 1264 proto_free(proto); 1265 } 1266 1267 if (!check_policy(exchange, sa, msg->isakmp_sa)) { 1268 message_drop(msg, ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); 1269 log_print("initiator_recv_HASH_SA_NONCE: policy check failed"); 1270 return -1; 1271 } 1272 1273 /* Mark the SA as handled. */ 1274 sa_p->flags |= PL_MARK; 1275 1276 isa = sa->data; 1277 if ((isa->group_desc && 1278 (!ie->group || ie->group->id != isa->group_desc)) || 1279 (!isa->group_desc && ie->group)) { 1280 log_print("initiator_recv_HASH_SA_NONCE: disagreement on PFS"); 1281 return -1; 1282 } 1283 /* Copy out the initiator's nonce. */ 1284 if (exchange_save_nonce(msg)) 1285 return -1; 1286 1287 /* Handle the optional KEY_EXCH payload. */ 1288 if (kep && ipsec_save_g_x(msg)) 1289 return -1; 1290 1291 return 0; 1292} 1293 1294static int 1295initiator_send_HASH(struct message *msg) 1296{ 1297 struct exchange *exchange = msg->exchange; 1298 struct ipsec_exch *ie = exchange->data; 1299 struct sa *isakmp_sa = msg->isakmp_sa; 1300 struct ipsec_sa *isa = isakmp_sa->data; 1301 struct prf *prf; 1302 u_int8_t *buf; 1303 struct hash *hash = hash_get(isa->hash); 1304 1305 /* 1306 * We want a HASH payload to start with. XXX Share with 1307 * ike_main_mode.c? 1308 */ 1309 buf = malloc(ISAKMP_HASH_SZ + hash->hashsize); 1310 if (!buf) { 1311 log_error("initiator_send_HASH: malloc (%lu) failed", 1312 ISAKMP_HASH_SZ + (unsigned long)hash->hashsize); 1313 return -1; 1314 } 1315 if (message_add_payload(msg, ISAKMP_PAYLOAD_HASH, buf, 1316 ISAKMP_HASH_SZ + hash->hashsize, 1)) { 1317 free(buf); 1318 return -1; 1319 } 1320 /* Allocate the prf and start calculating our HASH(3). XXX Share? */ 1321 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: SKEYID_a", 1322 isa->skeyid_a, isa->skeyid_len)); 1323 prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, 1324 isa->skeyid_len); 1325 if (!prf) 1326 return -1; 1327 prf->Init(prf->prfctx); 1328 prf->Update(prf->prfctx, (unsigned char *)"\0", 1); 1329 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: message_id", 1330 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1331 prf->Update(prf->prfctx, exchange->message_id, 1332 ISAKMP_HDR_MESSAGE_ID_LEN); 1333 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: NONCE_I_b", 1334 exchange->nonce_i, exchange->nonce_i_len)); 1335 prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); 1336 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: NONCE_R_b", 1337 exchange->nonce_r, exchange->nonce_r_len)); 1338 prf->Update(prf->prfctx, exchange->nonce_r, exchange->nonce_r_len); 1339 prf->Final(buf + ISAKMP_GEN_SZ, prf->prfctx); 1340 prf_free(prf); 1341 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: HASH(3)", 1342 buf + ISAKMP_GEN_SZ, hash->hashsize)); 1343 1344 if (ie->group) 1345 message_register_post_send(msg, gen_g_xy); 1346 1347 message_register_post_send(msg, post_quick_mode); 1348 1349 return 0; 1350} 1351 1352static void 1353post_quick_mode(struct message *msg) 1354{ 1355 struct sa *isakmp_sa = msg->isakmp_sa; 1356 struct ipsec_sa *isa = isakmp_sa->data; 1357 struct exchange *exchange = msg->exchange; 1358 struct ipsec_exch *ie = exchange->data; 1359 struct prf *prf; 1360 struct sa *sa; 1361 struct proto *proto; 1362 struct ipsec_proto *iproto; 1363 u_int8_t *keymat; 1364 int i; 1365 1366 /* 1367 * Loop over all SA negotiations and do both an in- and an outgoing SA 1368 * per protocol. 1369 */ 1370 for (sa = TAILQ_FIRST(&exchange->sa_list); sa; 1371 sa = TAILQ_NEXT(sa, next)) { 1372 for (proto = TAILQ_FIRST(&sa->protos); proto; 1373 proto = TAILQ_NEXT(proto, link)) { 1374 if (proto->proto == IPSEC_PROTO_IPCOMP) 1375 continue; 1376 1377 iproto = proto->data; 1378 1379 /* 1380 * There are two SAs for each SA negotiation, 1381 * incoming and outgoing. 1382 */ 1383 for (i = 0; i < 2; i++) { 1384 prf = prf_alloc(isa->prf_type, isa->hash, 1385 isa->skeyid_d, isa->skeyid_len); 1386 if (!prf) { 1387 /* XXX What to do? */ 1388 continue; 1389 } 1390 ie->keymat_len = ipsec_keymat_length(proto); 1391 1392 /* 1393 * We need to roundup the length of the key 1394 * material buffer to a multiple of the PRF's 1395 * blocksize as it is generated in chunks of 1396 * that blocksize. 1397 */ 1398 iproto->keymat[i] 1399 = malloc(((ie->keymat_len + prf->blocksize - 1) 1400 / prf->blocksize) * prf->blocksize); 1401 if (!iproto->keymat[i]) { 1402 log_error("post_quick_mode: " 1403 "malloc (%lu) failed", 1404 (((unsigned long)ie->keymat_len + 1405 prf->blocksize - 1) / prf->blocksize) * 1406 prf->blocksize); 1407 /* XXX What more to do? */ 1408 free(prf); 1409 continue; 1410 } 1411 for (keymat = iproto->keymat[i]; 1412 keymat < iproto->keymat[i] + ie->keymat_len; 1413 keymat += prf->blocksize) { 1414 prf->Init(prf->prfctx); 1415 1416 if (keymat != iproto->keymat[i]) { 1417 /* 1418 * Hash in last round's 1419 * KEYMAT. 1420 */ 1421 LOG_DBG_BUF((LOG_NEGOTIATION, 1422 90, "post_quick_mode: " 1423 "last KEYMAT", 1424 keymat - prf->blocksize, 1425 prf->blocksize)); 1426 prf->Update(prf->prfctx, 1427 keymat - prf->blocksize, 1428 prf->blocksize); 1429 } 1430 /* If PFS is used hash in g^xy. */ 1431 if (ie->g_xy) { 1432 LOG_DBG_BUF((LOG_NEGOTIATION, 1433 90, "post_quick_mode: " 1434 "g^xy", ie->g_xy, 1435 ie->g_xy_len)); 1436 prf->Update(prf->prfctx, 1437 ie->g_xy, ie->g_xy_len); 1438 } 1439 LOG_DBG((LOG_NEGOTIATION, 90, 1440 "post_quick_mode: " 1441 "suite %d proto %d", proto->no, 1442 proto->proto)); 1443 prf->Update(prf->prfctx, &proto->proto, 1444 1); 1445 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1446 "post_quick_mode: SPI", 1447 proto->spi[i], proto->spi_sz[i])); 1448 prf->Update(prf->prfctx, 1449 proto->spi[i], proto->spi_sz[i]); 1450 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1451 "post_quick_mode: Ni_b", 1452 exchange->nonce_i, 1453 exchange->nonce_i_len)); 1454 prf->Update(prf->prfctx, 1455 exchange->nonce_i, 1456 exchange->nonce_i_len); 1457 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1458 "post_quick_mode: Nr_b", 1459 exchange->nonce_r, 1460 exchange->nonce_r_len)); 1461 prf->Update(prf->prfctx, 1462 exchange->nonce_r, 1463 exchange->nonce_r_len); 1464 prf->Final(keymat, prf->prfctx); 1465 } 1466 prf_free(prf); 1467 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1468 "post_quick_mode: KEYMAT", 1469 iproto->keymat[i], ie->keymat_len)); 1470 } 1471 } 1472 } 1473 1474 log_verbose("isakmpd: quick mode done%s: %s", 1475 (exchange->initiator == 0) ? " (as responder)" : "", 1476 !msg->isakmp_sa || !msg->isakmp_sa->transport ? "<no transport>" 1477 : msg->isakmp_sa->transport->vtbl->decode_ids 1478 (msg->isakmp_sa->transport)); 1479} 1480 1481/* 1482 * Accept a set of transforms offered by the initiator and chose one we can 1483 * handle. 1484 * XXX Describe in more detail. 1485 */ 1486static int 1487responder_recv_HASH_SA_NONCE(struct message *msg) 1488{ 1489 struct payload *hashp, *kep, *idp; 1490 struct sa *sa; 1491 struct sa *isakmp_sa = msg->isakmp_sa; 1492 struct ipsec_sa *isa = isakmp_sa->data; 1493 struct exchange *exchange = msg->exchange; 1494 struct ipsec_exch *ie = exchange->data; 1495 struct prf *prf; 1496 u_int8_t *hash, *my_hash = 0; 1497 size_t hash_len; 1498 u_int8_t *pkt = msg->iov[0].iov_base; 1499 u_int8_t group_desc = 0; 1500 int retval = -1; 1501 struct proto *proto; 1502 struct sockaddr *src, *dst; 1503 char *name; 1504 1505 hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); 1506 hash = hashp->p; 1507 hashp->flags |= PL_MARK; 1508 1509 /* The HASH payload should be the first one. */ 1510 if (hash != pkt + ISAKMP_HDR_SZ) { 1511 /* XXX Is there a better notification type? */ 1512 message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1, 0); 1513 goto cleanup; 1514 } 1515 hash_len = GET_ISAKMP_GEN_LENGTH(hash); 1516 my_hash = malloc(hash_len - ISAKMP_GEN_SZ); 1517 if (!my_hash) { 1518 log_error("responder_recv_HASH_SA_NONCE: malloc (%lu) failed", 1519 (unsigned long)hash_len - ISAKMP_GEN_SZ); 1520 goto cleanup; 1521 } 1522 /* 1523 * Check the payload's integrity. 1524 * XXX Share with ipsec_fill_in_hash? 1525 */ 1526 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH_SA_NONCE: " 1527 "SKEYID_a", isa->skeyid_a, isa->skeyid_len)); 1528 prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, 1529 isa->skeyid_len); 1530 if (!prf) 1531 goto cleanup; 1532 prf->Init(prf->prfctx); 1533 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1534 "responder_recv_HASH_SA_NONCE: message_id", 1535 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1536 prf->Update(prf->prfctx, exchange->message_id, 1537 ISAKMP_HDR_MESSAGE_ID_LEN); 1538 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1539 "responder_recv_HASH_SA_NONCE: message after HASH", 1540 hash + hash_len, 1541 msg->iov[0].iov_len - ISAKMP_HDR_SZ - hash_len)); 1542 prf->Update(prf->prfctx, hash + hash_len, 1543 msg->iov[0].iov_len - ISAKMP_HDR_SZ - hash_len); 1544 prf->Final(my_hash, prf->prfctx); 1545 prf_free(prf); 1546 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1547 "responder_recv_HASH_SA_NONCE: computed HASH(1)", my_hash, 1548 hash_len - ISAKMP_GEN_SZ)); 1549 if (memcmp(hash + ISAKMP_GEN_SZ, my_hash, hash_len - ISAKMP_GEN_SZ) 1550 != 0) { 1551 message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1552 1, 0); 1553 goto cleanup; 1554 } 1555 free(my_hash); 1556 my_hash = 0; 1557 1558 /* Mark message as authenticated. */ 1559 msg->flags |= MSG_AUTHENTICATED; 1560 1561 kep = payload_first(msg, ISAKMP_PAYLOAD_KEY_EXCH); 1562 if (kep) 1563 ie->pfs = 1; 1564 1565 /* Drop message when it contains ID types we do not implement yet. */ 1566 TAILQ_FOREACH(idp, &msg->payload[ISAKMP_PAYLOAD_ID], link) { 1567 switch (GET_ISAKMP_ID_TYPE(idp->p)) { 1568 case IPSEC_ID_IPV4_ADDR: 1569 case IPSEC_ID_IPV4_ADDR_SUBNET: 1570 case IPSEC_ID_IPV6_ADDR: 1571 case IPSEC_ID_IPV6_ADDR_SUBNET: 1572 break; 1573 1574 case IPSEC_ID_FQDN: 1575 /* 1576 * FQDN may be used for in NAT-T with transport mode. 1577 * We can handle the message in this case. In the 1578 * other cases we'll drop the message later. 1579 */ 1580 break; 1581 1582 default: 1583 message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 1584 0, 1, 0); 1585 goto cleanup; 1586 } 1587 } 1588 1589 /* Handle optional client ID payloads. */ 1590 idp = payload_first(msg, ISAKMP_PAYLOAD_ID); 1591 if (idp) { 1592 /* If IDci is there, IDcr must be too. */ 1593 if (!TAILQ_NEXT(idp, link)) { 1594 /* XXX Is this a good notify type? */ 1595 message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1596 1, 0); 1597 goto cleanup; 1598 } 1599 ie->id_ci_sz = GET_ISAKMP_GEN_LENGTH(idp->p); 1600 ie->id_ci = malloc(ie->id_ci_sz); 1601 if (!ie->id_ci) { 1602 log_error("responder_recv_HASH_SA_NONCE: " 1603 "malloc (%lu) failed", 1604 (unsigned long)ie->id_ci_sz); 1605 goto cleanup; 1606 } 1607 memcpy(ie->id_ci, idp->p, ie->id_ci_sz); 1608 idp->flags |= PL_MARK; 1609 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1610 "responder_recv_HASH_SA_NONCE: IDci", 1611 ie->id_ci + ISAKMP_GEN_SZ, ie->id_ci_sz - ISAKMP_GEN_SZ)); 1612 1613 idp = TAILQ_NEXT(idp, link); 1614 ie->id_cr_sz = GET_ISAKMP_GEN_LENGTH(idp->p); 1615 ie->id_cr = malloc(ie->id_cr_sz); 1616 if (!ie->id_cr) { 1617 log_error("responder_recv_HASH_SA_NONCE: " 1618 "malloc (%lu) failed", 1619 (unsigned long)ie->id_cr_sz); 1620 goto cleanup; 1621 } 1622 memcpy(ie->id_cr, idp->p, ie->id_cr_sz); 1623 idp->flags |= PL_MARK; 1624 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1625 "responder_recv_HASH_SA_NONCE: IDcr", 1626 ie->id_cr + ISAKMP_GEN_SZ, ie->id_cr_sz - ISAKMP_GEN_SZ)); 1627 } else { 1628 /* 1629 * If client identifiers are not present in the exchange, 1630 * we fake them. RFC 2409 states: 1631 * The identities of the SAs negotiated in Quick Mode are 1632 * implicitly assumed to be the IP addresses of the ISAKMP 1633 * peers, without any constraints on the protocol or port 1634 * numbers allowed, unless client identifiers are specified 1635 * in Quick Mode. 1636 * 1637 * -- Michael Paddon (mwp@aba.net.au) 1638 */ 1639 1640 ie->flags = IPSEC_EXCH_FLAG_NO_ID; 1641 1642 /* Get initiator and responder addresses. */ 1643 msg->transport->vtbl->get_src(msg->transport, &src); 1644 msg->transport->vtbl->get_dst(msg->transport, &dst); 1645 ie->id_ci_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(src); 1646 ie->id_cr_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(dst); 1647 ie->id_ci = calloc(ie->id_ci_sz, sizeof(char)); 1648 ie->id_cr = calloc(ie->id_cr_sz, sizeof(char)); 1649 1650 if (!ie->id_ci || !ie->id_cr) { 1651 log_error("responder_recv_HASH_SA_NONCE: " 1652 "calloc (%lu, %lu) failed", 1653 (unsigned long)ie->id_ci_sz, 1654 (unsigned long)sizeof(char)); 1655 goto cleanup; 1656 } 1657 if (src->sa_family != dst->sa_family) { 1658 log_error("initiator_recv_HASH_SA_NONCE: " 1659 "sa_family mismatch"); 1660 goto cleanup; 1661 } 1662 switch (src->sa_family) { 1663 case AF_INET: 1664 SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV4_ADDR); 1665 SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV4_ADDR); 1666 break; 1667 1668 case AF_INET6: 1669 SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV6_ADDR); 1670 SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV6_ADDR); 1671 break; 1672 1673 default: 1674 log_error("initiator_recv_HASH_SA_NONCE: " 1675 "unknown sa_family %d", src->sa_family); 1676 goto cleanup; 1677 } 1678 1679 memcpy(ie->id_cr + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), 1680 sockaddr_addrlen(src)); 1681 memcpy(ie->id_ci + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(dst), 1682 sockaddr_addrlen(dst)); 1683 } 1684 1685 if (message_negotiate_sa(msg, check_policy)) 1686 goto cleanup; 1687 1688 for (sa = TAILQ_FIRST(&exchange->sa_list); sa; 1689 sa = TAILQ_NEXT(sa, next)) { 1690 for (proto = TAILQ_FIRST(&sa->protos); proto; 1691 proto = TAILQ_NEXT(proto, link)) { 1692 /* 1693 * XXX we need to have some attributes per proto, not 1694 * all per SA. 1695 */ 1696 ipsec_decode_transform(msg, sa, proto, 1697 proto->chosen->p); 1698 if (proto->proto == IPSEC_PROTO_IPSEC_AH && 1699 !((struct ipsec_proto *)proto->data)->auth) { 1700 log_print("responder_recv_HASH_SA_NONCE: " 1701 "AH proposed without an algorithm " 1702 "attribute"); 1703 message_drop(msg, 1704 ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); 1705 goto next_sa; 1706 } 1707 } 1708 1709 isa = sa->data; 1710 1711 /* 1712 * The group description is mandatory if we got a KEY_EXCH 1713 * payload. 1714 */ 1715 if (kep) { 1716 if (!isa->group_desc) { 1717 log_print("responder_recv_HASH_SA_NONCE: " 1718 "KEY_EXCH payload without a group " 1719 "desc. attribute"); 1720 message_drop(msg, 1721 ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); 1722 continue; 1723 } 1724 /* Also, all SAs must have equal groups. */ 1725 if (!group_desc) 1726 group_desc = isa->group_desc; 1727 else if (group_desc != isa->group_desc) { 1728 log_print("responder_recv_HASH_SA_NONCE: " 1729 "differing group descriptions in one QM"); 1730 message_drop(msg, 1731 ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); 1732 continue; 1733 } 1734 } 1735 /* At least one SA was accepted. */ 1736 retval = 0; 1737 1738next_sa: 1739 ; /* XXX gcc3 wants this. */ 1740 } 1741 1742 if (kep) { 1743 ie->group = group_get(group_desc); 1744 if (!ie->group) { 1745 /* 1746 * XXX If the error was due to an out-of-range group 1747 * description we should notify our peer, but this 1748 * should probably be done by the attribute 1749 * validation. Is it? 1750 */ 1751 goto cleanup; 1752 } 1753 } 1754 /* Copy out the initiator's nonce. */ 1755 if (exchange_save_nonce(msg)) 1756 goto cleanup; 1757 1758 /* Handle the optional KEY_EXCH payload. */ 1759 if (kep && ipsec_save_g_x(msg)) 1760 goto cleanup; 1761 1762 /* 1763 * Try to find and set the connection name on the exchange. 1764 */ 1765 1766 /* 1767 * Check for accepted identities as well as lookup the connection 1768 * name and set it on the exchange. 1769 * 1770 * When not using policies make sure the peer proposes sane IDs. 1771 * Otherwise this is done by KeyNote. 1772 */ 1773 name = connection_passive_lookup_by_ids(ie->id_ci, ie->id_cr); 1774 if (name) { 1775 exchange->name = strdup(name); 1776 if (!exchange->name) { 1777 log_error("responder_recv_HASH_SA_NONCE: " 1778 "strdup (\"%s\") failed", name); 1779 goto cleanup; 1780 } 1781 } else if ( 1782 ignore_policy || 1783 strncmp("yes", conf_get_str("General", "Use-Keynote"), 3)) { 1784 log_print("responder_recv_HASH_SA_NONCE: peer proposed " 1785 "invalid phase 2 IDs: %s", 1786 (exchange->doi->decode_ids("initiator id %s, responder" 1787 " id %s", ie->id_ci, ie->id_ci_sz, ie->id_cr, 1788 ie->id_cr_sz, 1))); 1789 message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 0, 1, 1790 0); 1791 goto cleanup; 1792 } 1793 1794 return retval; 1795 1796cleanup: 1797 /* Remove all potential protocols that have been added to the SAs. */ 1798 for (sa = TAILQ_FIRST(&exchange->sa_list); sa; 1799 sa = TAILQ_NEXT(sa, next)) 1800 while ((proto = TAILQ_FIRST(&sa->protos)) != 0) 1801 proto_free(proto); 1802 free(my_hash); 1803 free(ie->id_ci); 1804 ie->id_ci = 0; 1805 free(ie->id_cr); 1806 ie->id_cr = 0; 1807 return -1; 1808} 1809 1810/* Reply with the transform we chose. */ 1811static int 1812responder_send_HASH_SA_NONCE(struct message *msg) 1813{ 1814 struct exchange *exchange = msg->exchange; 1815 struct ipsec_exch *ie = exchange->data; 1816 struct sa *isakmp_sa = msg->isakmp_sa; 1817 struct ipsec_sa *isa = isakmp_sa->data; 1818 struct prf *prf; 1819 struct hash *hash = hash_get(isa->hash); 1820 size_t nonce_sz = exchange->nonce_i_len; 1821 u_int8_t *buf; 1822 int initiator = exchange->initiator; 1823 char header[80]; 1824 u_int32_t i; 1825 u_int8_t *id; 1826 size_t sz; 1827 1828 /* 1829 * We want a HASH payload to start with. XXX Share with 1830 * ike_main_mode.c? 1831 */ 1832 buf = malloc(ISAKMP_HASH_SZ + hash->hashsize); 1833 if (!buf) { 1834 log_error("responder_send_HASH_SA_NONCE: malloc (%lu) failed", 1835 ISAKMP_HASH_SZ + (unsigned long)hash->hashsize); 1836 return -1; 1837 } 1838 if (message_add_payload(msg, ISAKMP_PAYLOAD_HASH, buf, 1839 ISAKMP_HASH_SZ + hash->hashsize, 1)) { 1840 free(buf); 1841 return -1; 1842 } 1843 /* Add the SA payload(s) with the transform(s) that was/were chosen. */ 1844 if (message_add_sa_payload(msg)) 1845 return -1; 1846 1847 /* Generate a nonce, and add it to the message. */ 1848 if (exchange_gen_nonce(msg, nonce_sz)) 1849 return -1; 1850 1851 /* Generate optional KEY_EXCH payload. This is known as PFS. */ 1852 if (ie->group && ipsec_gen_g_x(msg)) 1853 return -1; 1854 1855 /* 1856 * If the initiator client ID's were acceptable, just mirror them 1857 * back. 1858 */ 1859 if (!(ie->flags & IPSEC_EXCH_FLAG_NO_ID)) { 1860 sz = ie->id_ci_sz; 1861 id = malloc(sz); 1862 if (!id) { 1863 log_error("responder_send_HASH_SA_NONCE: " 1864 "malloc (%lu) failed", (unsigned long)sz); 1865 return -1; 1866 } 1867 memcpy(id, ie->id_ci, sz); 1868 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1869 "responder_send_HASH_SA_NONCE: IDic", id, sz)); 1870 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 1871 free(id); 1872 return -1; 1873 } 1874 sz = ie->id_cr_sz; 1875 id = malloc(sz); 1876 if (!id) { 1877 log_error("responder_send_HASH_SA_NONCE: " 1878 "malloc (%lu) failed", (unsigned long)sz); 1879 return -1; 1880 } 1881 memcpy(id, ie->id_cr, sz); 1882 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1883 "responder_send_HASH_SA_NONCE: IDrc", id, sz)); 1884 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 1885 free(id); 1886 return -1; 1887 } 1888 } 1889 /* Allocate the prf and start calculating our HASH(2). XXX Share? */ 1890 LOG_DBG((LOG_NEGOTIATION, 90, "responder_recv_HASH: " 1891 "isakmp_sa %p isa %p", isakmp_sa, isa)); 1892 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: " 1893 "SKEYID_a", isa->skeyid_a, isa->skeyid_len)); 1894 prf = prf_alloc(isa->prf_type, hash->type, isa->skeyid_a, 1895 isa->skeyid_len); 1896 if (!prf) 1897 return -1; 1898 prf->Init(prf->prfctx); 1899 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1900 "responder_send_HASH_SA_NONCE: message_id", 1901 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1902 prf->Update(prf->prfctx, exchange->message_id, 1903 ISAKMP_HDR_MESSAGE_ID_LEN); 1904 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: " 1905 "NONCE_I_b", exchange->nonce_i, exchange->nonce_i_len)); 1906 prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); 1907 1908 /* Loop over all payloads after HASH(2). */ 1909 for (i = 2; i < msg->iovlen; i++) { 1910 /* XXX Misleading payload type printouts. */ 1911 snprintf(header, sizeof header, 1912 "responder_send_HASH_SA_NONCE: payload %d after HASH(2)", 1913 i - 1); 1914 LOG_DBG_BUF((LOG_NEGOTIATION, 90, header, msg->iov[i].iov_base, 1915 msg->iov[i].iov_len)); 1916 prf->Update(prf->prfctx, msg->iov[i].iov_base, 1917 msg->iov[i].iov_len); 1918 } 1919 prf->Final(buf + ISAKMP_HASH_DATA_OFF, prf->prfctx); 1920 prf_free(prf); 1921 snprintf(header, sizeof header, "responder_send_HASH_SA_NONCE: " 1922 "HASH_%c", initiator ? 'I' : 'R'); 1923 LOG_DBG_BUF((LOG_NEGOTIATION, 80, header, buf + ISAKMP_HASH_DATA_OFF, 1924 hash->hashsize)); 1925 1926 if (ie->group) 1927 message_register_post_send(msg, gen_g_xy); 1928 1929 return 0; 1930} 1931 1932static void 1933gen_g_xy(struct message *msg) 1934{ 1935 struct exchange *exchange = msg->exchange; 1936 struct ipsec_exch *ie = exchange->data; 1937 1938 /* Compute Diffie-Hellman shared value. */ 1939 ie->g_xy_len = dh_secretlen(ie->group); 1940 ie->g_xy = malloc(ie->g_xy_len); 1941 if (!ie->g_xy) { 1942 log_error("gen_g_xy: malloc (%lu) failed", 1943 (unsigned long)ie->g_xy_len); 1944 return; 1945 } 1946 if (dh_create_shared(ie->group, ie->g_xy, 1947 exchange->initiator ? ie->g_xr : ie->g_xi)) { 1948 log_print("gen_g_xy: dh_create_shared failed"); 1949 return; 1950 } 1951 LOG_DBG_BUF((LOG_NEGOTIATION, 80, "gen_g_xy: g^xy", ie->g_xy, 1952 ie->g_xy_len)); 1953} 1954 1955static int 1956responder_recv_HASH(struct message *msg) 1957{ 1958 struct exchange *exchange = msg->exchange; 1959 struct sa *isakmp_sa = msg->isakmp_sa; 1960 struct ipsec_sa *isa = isakmp_sa->data; 1961 struct prf *prf; 1962 u_int8_t *hash, *my_hash = 0; 1963 size_t hash_len; 1964 struct payload *hashp; 1965 1966 /* Find HASH(3) and create our own hash, just as big. */ 1967 hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); 1968 hash = hashp->p; 1969 hashp->flags |= PL_MARK; 1970 hash_len = GET_ISAKMP_GEN_LENGTH(hash); 1971 my_hash = malloc(hash_len - ISAKMP_GEN_SZ); 1972 if (!my_hash) { 1973 log_error("responder_recv_HASH: malloc (%lu) failed", 1974 (unsigned long)hash_len - ISAKMP_GEN_SZ); 1975 goto cleanup; 1976 } 1977 /* Allocate the prf and start calculating our HASH(3). XXX Share? */ 1978 LOG_DBG((LOG_NEGOTIATION, 90, "responder_recv_HASH: " 1979 "isakmp_sa %p isa %p", isakmp_sa, isa)); 1980 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: SKEYID_a", 1981 isa->skeyid_a, isa->skeyid_len)); 1982 prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, 1983 isa->skeyid_len); 1984 if (!prf) 1985 goto cleanup; 1986 prf->Init(prf->prfctx); 1987 prf->Update(prf->prfctx, (unsigned char *)"\0", 1); 1988 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: message_id", 1989 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1990 prf->Update(prf->prfctx, exchange->message_id, 1991 ISAKMP_HDR_MESSAGE_ID_LEN); 1992 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: NONCE_I_b", 1993 exchange->nonce_i, exchange->nonce_i_len)); 1994 prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); 1995 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: NONCE_R_b", 1996 exchange->nonce_r, exchange->nonce_r_len)); 1997 prf->Update(prf->prfctx, exchange->nonce_r, exchange->nonce_r_len); 1998 prf->Final(my_hash, prf->prfctx); 1999 prf_free(prf); 2000 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 2001 "responder_recv_HASH: computed HASH(3)", my_hash, 2002 hash_len - ISAKMP_GEN_SZ)); 2003 if (memcmp(hash + ISAKMP_GEN_SZ, my_hash, hash_len - ISAKMP_GEN_SZ) 2004 != 0) { 2005 message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 2006 1, 0); 2007 goto cleanup; 2008 } 2009 free(my_hash); 2010 2011 /* Mark message as authenticated. */ 2012 msg->flags |= MSG_AUTHENTICATED; 2013 2014 post_quick_mode(msg); 2015 2016 return 0; 2017 2018cleanup: 2019 free(my_hash); 2020 return -1; 2021} 2022