1 /* $OpenBSD: ike_quick_mode.c,v 1.110 2015/12/10 17:27:00 mmcc 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 60 static void gen_g_xy(struct message *); 61 static int initiator_send_HASH_SA_NONCE(struct message *); 62 static int initiator_recv_HASH_SA_NONCE(struct message *); 63 static int initiator_send_HASH(struct message *); 64 static void post_quick_mode(struct message *); 65 static int responder_recv_HASH_SA_NONCE(struct message *); 66 static int responder_send_HASH_SA_NONCE(struct message *); 67 static int responder_recv_HASH(struct message *); 68 69 static int check_policy(struct exchange *, struct sa *, struct sa *); 70 71 int (*ike_quick_mode_initiator[])(struct message *) = { 72 initiator_send_HASH_SA_NONCE, 73 initiator_recv_HASH_SA_NONCE, 74 initiator_send_HASH 75 }; 76 77 int (*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 */ 90 static int 91 check_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 } 347 policydone: 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 */ 385 static int 386 initiator_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 int group_desc = -1, new_group_desc; 410 struct ipsec_sa *isa = msg->isakmp_sa->data; 411 struct hash *hash = hash_get(isa->hash); 412 struct sockaddr *src; 413 struct proto_attr *pa; 414 415 if (!ipsec_add_hash_payload(msg, hash->hashsize)) 416 return -1; 417 418 /* Get the list of protocol suites. */ 419 suite_conf = conf_get_list(exchange->policy, "Suites"); 420 if (!suite_conf) 421 return -1; 422 423 for (suite = TAILQ_FIRST(&suite_conf->fields), suite_no = prop_no = 0; 424 suite_no < suite_conf->cnt; 425 suite_no++, suite = TAILQ_NEXT(suite, link)) { 426 /* Now get each protocol in this specific protocol suite. */ 427 prot_conf = conf_get_list(suite->field, "Protocols"); 428 if (!prot_conf) 429 goto bail_out; 430 431 for (prot = TAILQ_FIRST(&prot_conf->fields), prot_no = 0; 432 prot_no < prot_conf->cnt; 433 prot_no++, prot = TAILQ_NEXT(prot, link)) { 434 /* Make sure we have a proposal/transform vectors. */ 435 if (prop_no >= prop_cnt) { 436 /* 437 * This resize algorithm is completely 438 * arbitrary. 439 */ 440 prop_cnt = 2 * prop_cnt + 10; 441 new_proposal = reallocarray(proposal, 442 prop_cnt, sizeof *proposal); 443 if (!new_proposal) { 444 log_error( 445 "initiator_send_HASH_SA_NONCE: " 446 "realloc (%p, %lu) failed", 447 proposal, 448 prop_cnt * (unsigned long)sizeof *proposal); 449 goto bail_out; 450 } 451 proposal = new_proposal; 452 453 new_transforms_len = reallocarray(transforms_len, 454 prop_cnt, sizeof *transforms_len); 455 if (!new_transforms_len) { 456 log_error( 457 "initiator_send_HASH_SA_NONCE: " 458 "realloc (%p, %lu) failed", 459 transforms_len, 460 prop_cnt * (unsigned long)sizeof *transforms_len); 461 goto bail_out; 462 } 463 transforms_len = new_transforms_len; 464 465 new_transform = reallocarray(transform, 466 prop_cnt, sizeof *transform); 467 if (!new_transform) { 468 log_error( 469 "initiator_send_HASH_SA_NONCE: " 470 "realloc (%p, %lu) failed", 471 transform, 472 prop_cnt * (unsigned long)sizeof *transform); 473 goto bail_out; 474 } 475 transform = new_transform; 476 477 new_transform_cnt = reallocarray(transform_cnt, 478 prop_cnt, sizeof *transform_cnt); 479 if (!new_transform_cnt) { 480 log_error( 481 "initiator_send_HASH_SA_NONCE: " 482 "realloc (%p, %lu) failed", 483 transform_cnt, 484 prop_cnt * (unsigned long)sizeof *transform_cnt); 485 goto bail_out; 486 } 487 transform_cnt = new_transform_cnt; 488 489 new_transform_len = reallocarray(transform_len, 490 prop_cnt, sizeof *transform_len); 491 if (!new_transform_len) { 492 log_error( 493 "initiator_send_HASH_SA_NONCE: " 494 "realloc (%p, %lu) failed", 495 transform_len, 496 prop_cnt * (unsigned long)sizeof *transform_len); 497 goto bail_out; 498 } 499 transform_len = new_transform_len; 500 } 501 protocol_id = conf_get_str(prot->field, "PROTOCOL_ID"); 502 if (!protocol_id) 503 goto bail_out; 504 505 proto_id = constant_value(ipsec_proto_cst, 506 protocol_id); 507 switch (proto_id) { 508 case IPSEC_PROTO_IPSEC_AH: 509 id_map = ipsec_ah_cst; 510 break; 511 512 case IPSEC_PROTO_IPSEC_ESP: 513 id_map = ipsec_esp_cst; 514 break; 515 516 case IPSEC_PROTO_IPCOMP: 517 id_map = ipsec_ipcomp_cst; 518 break; 519 520 default: 521 { 522 log_print("initiator_send_HASH_SA_NONCE: " 523 "invalid PROTCOL_ID: %s", protocol_id); 524 goto bail_out; 525 } 526 } 527 528 /* Now get each transform we offer for this protocol.*/ 529 xf_conf = conf_get_list(prot->field, "Transforms"); 530 if (!xf_conf) 531 goto bail_out; 532 transform_cnt[prop_no] = xf_conf->cnt; 533 534 transform[prop_no] = calloc(transform_cnt[prop_no], 535 sizeof **transform); 536 if (!transform[prop_no]) { 537 log_error("initiator_send_HASH_SA_NONCE: " 538 "calloc (%d, %lu) failed", 539 transform_cnt[prop_no], 540 (unsigned long)sizeof **transform); 541 goto bail_out; 542 } 543 transform_len[prop_no] = calloc(transform_cnt[prop_no], 544 sizeof **transform_len); 545 if (!transform_len[prop_no]) { 546 log_error("initiator_send_HASH_SA_NONCE: " 547 "calloc (%d, %lu) failed", 548 transform_cnt[prop_no], 549 (unsigned long)sizeof **transform_len); 550 goto bail_out; 551 } 552 transforms_len[prop_no] = 0; 553 for (xf = TAILQ_FIRST(&xf_conf->fields), xf_no = 0; 554 xf_no < transform_cnt[prop_no]; 555 xf_no++, xf = TAILQ_NEXT(xf, link)) { 556 557 /* XXX The sizing needs to be dynamic. */ 558 transform[prop_no][xf_no] = 559 calloc(ISAKMP_TRANSFORM_SA_ATTRS_OFF + 560 9 * ISAKMP_ATTR_VALUE_OFF, 1); 561 if (!transform[prop_no][xf_no]) { 562 log_error( 563 "initiator_send_HASH_SA_NONCE: " 564 "calloc (%d, 1) failed", 565 ISAKMP_TRANSFORM_SA_ATTRS_OFF + 566 9 * ISAKMP_ATTR_VALUE_OFF); 567 goto bail_out; 568 } 569 SET_ISAKMP_TRANSFORM_NO(transform[prop_no][xf_no], 570 xf_no + 1); 571 572 transform_id = conf_get_str(xf->field, 573 "TRANSFORM_ID"); 574 if (!transform_id) 575 goto bail_out; 576 SET_ISAKMP_TRANSFORM_ID(transform[prop_no][xf_no], 577 constant_value(id_map, transform_id)); 578 SET_ISAKMP_TRANSFORM_RESERVED(transform[prop_no][xf_no], 0); 579 580 attr = transform[prop_no][xf_no] + 581 ISAKMP_TRANSFORM_SA_ATTRS_OFF; 582 583 /* 584 * Life durations are special, we should be 585 * able to specify several, one per type. 586 */ 587 life_conf = conf_get_list(xf->field, "Life"); 588 if (life_conf) { 589 for (life = TAILQ_FIRST(&life_conf->fields); 590 life; life = TAILQ_NEXT(life, link)) { 591 attribute_set_constant( 592 life->field, "LIFE_TYPE", 593 ipsec_duration_cst, 594 IPSEC_ATTR_SA_LIFE_TYPE, 595 &attr); 596 597 /* 598 * XXX Deals with 16 and 32 599 * bit lifetimes only 600 */ 601 value = 602 conf_get_num(life->field, 603 "LIFE_DURATION", 0); 604 if (value) { 605 if (value <= 0xffff) 606 attr = 607 attribute_set_basic( 608 attr, 609 IPSEC_ATTR_SA_LIFE_DURATION, 610 value); 611 else { 612 value = htonl(value); 613 attr = 614 attribute_set_var( 615 attr, 616 IPSEC_ATTR_SA_LIFE_DURATION, 617 (u_int8_t *)&value, 618 sizeof value); 619 } 620 } 621 } 622 conf_free_list(life_conf); 623 } 624 attribute_set_constant(xf->field, 625 "ENCAPSULATION_MODE", ipsec_encap_cst, 626 IPSEC_ATTR_ENCAPSULATION_MODE, &attr); 627 628 if (proto_id != IPSEC_PROTO_IPCOMP) { 629 attribute_set_constant(xf->field, 630 "AUTHENTICATION_ALGORITHM", 631 ipsec_auth_cst, 632 IPSEC_ATTR_AUTHENTICATION_ALGORITHM, 633 &attr); 634 635 attribute_set_constant(xf->field, 636 "GROUP_DESCRIPTION", 637 ike_group_desc_cst, 638 IPSEC_ATTR_GROUP_DESCRIPTION, &attr); 639 640 value = conf_get_num(xf->field, 641 "KEY_LENGTH", 0); 642 if (value) 643 attr = attribute_set_basic( 644 attr, 645 IPSEC_ATTR_KEY_LENGTH, 646 value); 647 648 value = conf_get_num(xf->field, 649 "KEY_ROUNDS", 0); 650 if (value) 651 attr = attribute_set_basic( 652 attr, 653 IPSEC_ATTR_KEY_ROUNDS, 654 value); 655 } else { 656 value = conf_get_num(xf->field, 657 "COMPRESS_DICTIONARY_SIZE", 0); 658 if (value) 659 attr = attribute_set_basic( 660 attr, 661 IPSEC_ATTR_COMPRESS_DICTIONARY_SIZE, 662 value); 663 664 value = conf_get_num(xf->field, 665 "COMPRESS_PRIVATE_ALGORITHM", 0); 666 if (value) 667 attr = attribute_set_basic( 668 attr, 669 IPSEC_ATTR_COMPRESS_PRIVATE_ALGORITHM, 670 value); 671 } 672 673 value = conf_get_num(xf->field, "ECN_TUNNEL", 674 0); 675 if (value) 676 attr = attribute_set_basic(attr, 677 IPSEC_ATTR_ECN_TUNNEL, value); 678 679 /* Record the real transform size. */ 680 transforms_len[prop_no] += 681 (transform_len[prop_no][xf_no] 682 = attr - transform[prop_no][xf_no]); 683 684 if (proto_id != IPSEC_PROTO_IPCOMP) { 685 /* 686 * Make sure that if a group 687 * description is specified, it is 688 * specified for all transforms 689 * equally. 690 */ 691 attr = 692 (u_int8_t *)conf_get_str(xf->field, 693 "GROUP_DESCRIPTION"); 694 new_group_desc 695 = attr ? constant_value(ike_group_desc_cst, 696 (char *)attr) : 0; 697 if (group_desc == -1) 698 group_desc = new_group_desc; 699 else if (group_desc != new_group_desc) { 700 log_print("initiator_send_HASH_SA_NONCE: " 701 "differing group descriptions in a proposal"); 702 goto bail_out; 703 } 704 } 705 } 706 conf_free_list(xf_conf); 707 xf_conf = 0; 708 709 /* 710 * Get SPI from application. 711 * XXX Should we care about unknown constants? 712 */ 713 protocol_num = constant_value(ipsec_proto_cst, 714 protocol_id); 715 spi = doi->get_spi(&spi_sz, protocol_num, msg); 716 if (spi_sz && !spi) { 717 log_print("initiator_send_HASH_SA_NONCE: " 718 "doi->get_spi failed"); 719 goto bail_out; 720 } 721 proposal_len = ISAKMP_PROP_SPI_OFF + spi_sz; 722 proposals_len += 723 proposal_len + transforms_len[prop_no]; 724 proposal[prop_no] = malloc(proposal_len); 725 if (!proposal[prop_no]) { 726 log_error("initiator_send_HASH_SA_NONCE: " 727 "malloc (%lu) failed", 728 (unsigned long)proposal_len); 729 goto bail_out; 730 } 731 SET_ISAKMP_PROP_NO(proposal[prop_no], suite_no + 1); 732 SET_ISAKMP_PROP_PROTO(proposal[prop_no], protocol_num); 733 734 /* XXX I would like to see this factored out. */ 735 proto = calloc(1, sizeof *proto); 736 if (!proto) { 737 log_error("initiator_send_HASH_SA_NONCE: " 738 "calloc (1, %lu) failed", 739 (unsigned long)sizeof *proto); 740 goto bail_out; 741 } 742 if (doi->proto_size) { 743 proto->data = calloc(1, doi->proto_size); 744 if (!proto->data) { 745 free(proto); 746 log_error( 747 "initiator_send_HASH_SA_NONCE: " 748 "calloc (1, %lu) failed", 749 (unsigned long)doi->proto_size); 750 goto bail_out; 751 } 752 } 753 proto->no = suite_no + 1; 754 proto->proto = protocol_num; 755 proto->sa = TAILQ_FIRST(&exchange->sa_list); 756 proto->xf_cnt = transform_cnt[prop_no]; 757 TAILQ_INIT(&proto->xfs); 758 for (xf_no = 0; xf_no < proto->xf_cnt; xf_no++) { 759 pa = calloc(1, sizeof *pa); 760 if (!pa) { 761 free(proto->data); 762 free(proto); 763 goto bail_out; 764 } 765 pa->len = transform_len[prop_no][xf_no]; 766 pa->attrs = malloc(pa->len); 767 if (!pa->attrs) { 768 free(proto->data); 769 free(proto); 770 free(pa); 771 goto bail_out; 772 } 773 memcpy(pa->attrs, transform[prop_no][xf_no], 774 pa->len); 775 TAILQ_INSERT_TAIL(&proto->xfs, pa, next); 776 } 777 TAILQ_INSERT_TAIL(&TAILQ_FIRST(&exchange->sa_list)->protos, 778 proto, link); 779 780 /* Setup the incoming SPI. */ 781 SET_ISAKMP_PROP_SPI_SZ(proposal[prop_no], spi_sz); 782 memcpy(proposal[prop_no] + ISAKMP_PROP_SPI_OFF, spi, 783 spi_sz); 784 proto->spi_sz[1] = spi_sz; 785 proto->spi[1] = spi; 786 787 /* 788 * Let the DOI get at proto for initializing its own 789 * data. 790 */ 791 if (doi->proto_init) 792 doi->proto_init(proto, prot->field); 793 794 SET_ISAKMP_PROP_NTRANSFORMS(proposal[prop_no], 795 transform_cnt[prop_no]); 796 prop_no++; 797 } 798 conf_free_list(prot_conf); 799 prot_conf = 0; 800 } 801 802 sa_len = ISAKMP_SA_SIT_OFF + IPSEC_SIT_SIT_LEN; 803 sa_buf = malloc(sa_len); 804 if (!sa_buf) { 805 log_error("initiator_send_HASH_SA_NONCE: malloc (%lu) failed", 806 (unsigned long)sa_len); 807 goto bail_out; 808 } 809 SET_ISAKMP_SA_DOI(sa_buf, IPSEC_DOI_IPSEC); 810 SET_IPSEC_SIT_SIT(sa_buf + ISAKMP_SA_SIT_OFF, IPSEC_SIT_IDENTITY_ONLY); 811 812 /* 813 * Add the payloads. As this is a SA, we need to recompute the 814 * lengths of the payloads containing others. We also need to 815 * reset these payload's "next payload type" field. 816 */ 817 if (message_add_payload(msg, ISAKMP_PAYLOAD_SA, sa_buf, sa_len, 1)) 818 goto bail_out; 819 SET_ISAKMP_GEN_LENGTH(sa_buf, sa_len + proposals_len); 820 sa_buf = 0; 821 822 update_nextp = 0; 823 saved_nextp_sa = msg->nextp; 824 for (i = 0; i < prop_no; i++) { 825 if (message_add_payload(msg, ISAKMP_PAYLOAD_PROPOSAL, 826 proposal[i], proposal_len, update_nextp)) 827 goto bail_out; 828 SET_ISAKMP_GEN_LENGTH(proposal[i], 829 proposal_len + transforms_len[i]); 830 proposal[i] = 0; 831 832 update_nextp = 0; 833 saved_nextp_prop = msg->nextp; 834 for (xf_no = 0; xf_no < transform_cnt[i]; xf_no++) { 835 if (message_add_payload(msg, ISAKMP_PAYLOAD_TRANSFORM, 836 transform[i][xf_no], 837 transform_len[i][xf_no], update_nextp)) 838 goto bail_out; 839 update_nextp = 1; 840 transform[i][xf_no] = 0; 841 } 842 msg->nextp = saved_nextp_prop; 843 update_nextp = 1; 844 } 845 msg->nextp = saved_nextp_sa; 846 847 /* 848 * Save SA payload body in ie->sa_i_b, length ie->sa_i_b_len. 849 */ 850 ie->sa_i_b = message_copy(msg, ISAKMP_GEN_SZ, &ie->sa_i_b_len); 851 if (!ie->sa_i_b) 852 goto bail_out; 853 854 /* 855 * Generate a nonce, and add it to the message. 856 * XXX I want a better way to specify the nonce's size. 857 */ 858 if (exchange_gen_nonce(msg, 16)) 859 return -1; 860 861 /* Generate optional KEY_EXCH payload. */ 862 if (group_desc > 0) { 863 ie->group = group_get(group_desc); 864 ie->g_x_len = dh_getlen(ie->group); 865 866 if (ipsec_gen_g_x(msg)) { 867 group_free(ie->group); 868 ie->group = 0; 869 return -1; 870 } 871 } 872 /* Generate optional client ID payloads. XXX Share with responder. */ 873 local_id = conf_get_str(exchange->name, "Local-ID"); 874 remote_id = conf_get_str(exchange->name, "Remote-ID"); 875 if (local_id && remote_id) { 876 id = ipsec_build_id(local_id, &sz); 877 if (!id) 878 return -1; 879 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 880 "initiator_send_HASH_SA_NONCE: IDic", id, sz)); 881 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 882 free(id); 883 return -1; 884 } 885 id = ipsec_build_id(remote_id, &sz); 886 if (!id) 887 return -1; 888 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 889 "initiator_send_HASH_SA_NONCE: IDrc", id, sz)); 890 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 891 free(id); 892 return -1; 893 } 894 } 895 /* XXX I do not judge these as errors, are they? */ 896 else if (local_id) 897 log_print("initiator_send_HASH_SA_NONCE: " 898 "Local-ID given without Remote-ID for \"%s\"", 899 exchange->name); 900 else if (remote_id) 901 /* 902 * This code supports the "road warrior" case, where the 903 * initiator doesn't have a fixed IP address, but wants to 904 * specify a particular remote network to talk to. -- Adrian 905 * Close <adrian@esec.com.au> 906 */ 907 { 908 log_print("initiator_send_HASH_SA_NONCE: " 909 "Remote-ID given without Local-ID for \"%s\"", 910 exchange->name); 911 912 /* 913 * If we're here, then we are the initiator, so use initiator 914 * address for local ID 915 */ 916 msg->transport->vtbl->get_src(msg->transport, &src); 917 sz = ISAKMP_ID_SZ + sockaddr_addrlen(src); 918 919 id = calloc(sz, sizeof(char)); 920 if (!id) { 921 log_error("initiator_send_HASH_SA_NONCE: " 922 "calloc (%lu, %lu) failed", (unsigned long)sz, 923 (unsigned long)sizeof(char)); 924 return -1; 925 } 926 switch (src->sa_family) { 927 case AF_INET6: 928 SET_ISAKMP_ID_TYPE(id, IPSEC_ID_IPV6_ADDR); 929 break; 930 case AF_INET: 931 SET_ISAKMP_ID_TYPE(id, IPSEC_ID_IPV4_ADDR); 932 break; 933 default: 934 log_error("initiator_send_HASH_SA_NONCE: " 935 "unknown sa_family %d", src->sa_family); 936 free(id); 937 return -1; 938 } 939 memcpy(id + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), 940 sockaddr_addrlen(src)); 941 942 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 943 "initiator_send_HASH_SA_NONCE: IDic", id, sz)); 944 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 945 free(id); 946 return -1; 947 } 948 /* Send supplied remote_id */ 949 id = ipsec_build_id(remote_id, &sz); 950 if (!id) 951 return -1; 952 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 953 "initiator_send_HASH_SA_NONCE: IDrc", id, sz)); 954 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 955 free(id); 956 return -1; 957 } 958 } 959 if (ipsec_fill_in_hash(msg)) 960 goto bail_out; 961 962 conf_free_list(suite_conf); 963 for (i = 0; i < prop_no; i++) { 964 free(transform[i]); 965 free(transform_len[i]); 966 } 967 free(proposal); 968 free(transform); 969 free(transforms_len); 970 free(transform_len); 971 free(transform_cnt); 972 return 0; 973 974 bail_out: 975 free(sa_buf); 976 if (proposal) { 977 for (i = 0; i < prop_no; i++) { 978 free(proposal[i]); 979 if (transform[i]) { 980 for (xf_no = 0; xf_no < transform_cnt[i]; 981 xf_no++) 982 free(transform[i][xf_no]); 983 free(transform[i]); 984 } 985 free(transform_len[i]); 986 } 987 free(proposal); 988 free(transforms_len); 989 free(transform); 990 free(transform_len); 991 free(transform_cnt); 992 } 993 if (xf_conf) 994 conf_free_list(xf_conf); 995 if (prot_conf) 996 conf_free_list(prot_conf); 997 conf_free_list(suite_conf); 998 return -1; 999 } 1000 1001 /* Figure out what transform the responder chose. */ 1002 static int 1003 initiator_recv_HASH_SA_NONCE(struct message *msg) 1004 { 1005 struct exchange *exchange = msg->exchange; 1006 struct ipsec_exch *ie = exchange->data; 1007 struct sa *sa; 1008 struct proto *proto, *next_proto; 1009 struct payload *sa_p = payload_first(msg, ISAKMP_PAYLOAD_SA); 1010 struct payload *xf, *idp; 1011 struct payload *hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); 1012 struct payload *kep = payload_first(msg, ISAKMP_PAYLOAD_KEY_EXCH); 1013 struct prf *prf; 1014 struct sa *isakmp_sa = msg->isakmp_sa; 1015 struct ipsec_sa *isa = isakmp_sa->data; 1016 struct hash *hash = hash_get(isa->hash); 1017 u_int8_t *rest; 1018 size_t rest_len; 1019 struct sockaddr *src, *dst; 1020 1021 /* Allocate the prf and start calculating our HASH(1). XXX Share? */ 1022 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: " 1023 "SKEYID_a", (u_int8_t *)isa->skeyid_a, isa->skeyid_len)); 1024 prf = prf_alloc(isa->prf_type, hash->type, isa->skeyid_a, 1025 isa->skeyid_len); 1026 if (!prf) 1027 return -1; 1028 1029 prf->Init(prf->prfctx); 1030 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1031 "initiator_recv_HASH_SA_NONCE: message_id", 1032 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1033 prf->Update(prf->prfctx, exchange->message_id, 1034 ISAKMP_HDR_MESSAGE_ID_LEN); 1035 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: " 1036 "NONCE_I_b", exchange->nonce_i, exchange->nonce_i_len)); 1037 prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); 1038 rest = hashp->p + GET_ISAKMP_GEN_LENGTH(hashp->p); 1039 rest_len = (GET_ISAKMP_HDR_LENGTH(msg->iov[0].iov_base) 1040 - (rest - (u_int8_t *)msg->iov[0].iov_base)); 1041 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1042 "initiator_recv_HASH_SA_NONCE: payloads after HASH(2)", rest, 1043 rest_len)); 1044 prf->Update(prf->prfctx, rest, rest_len); 1045 prf->Final(hash->digest, prf->prfctx); 1046 prf_free(prf); 1047 LOG_DBG_BUF((LOG_NEGOTIATION, 80, 1048 "initiator_recv_HASH_SA_NONCE: computed HASH(2)", hash->digest, 1049 hash->hashsize)); 1050 if (memcmp(hashp->p + ISAKMP_HASH_DATA_OFF, hash->digest, 1051 hash->hashsize) != 0) { 1052 message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1, 1053 0); 1054 return -1; 1055 } 1056 /* Mark the HASH as handled. */ 1057 hashp->flags |= PL_MARK; 1058 1059 /* Mark message as authenticated. */ 1060 msg->flags |= MSG_AUTHENTICATED; 1061 1062 /* 1063 * As we are getting an answer on our transform offer, only one 1064 * transform should be given. 1065 * 1066 * XXX Currently we only support negotiating one SA per quick mode run. 1067 */ 1068 if (TAILQ_NEXT(sa_p, link)) { 1069 log_print("initiator_recv_HASH_SA_NONCE: " 1070 "multiple SA payloads in quick mode not supported yet"); 1071 return -1; 1072 } 1073 sa = TAILQ_FIRST(&exchange->sa_list); 1074 1075 /* This is here for the policy check */ 1076 if (kep) 1077 ie->pfs = 1; 1078 1079 /* Drop message when it contains ID types we do not implement yet. */ 1080 TAILQ_FOREACH(idp, &msg->payload[ISAKMP_PAYLOAD_ID], link) { 1081 switch (GET_ISAKMP_ID_TYPE(idp->p)) { 1082 case IPSEC_ID_IPV4_ADDR: 1083 case IPSEC_ID_IPV4_ADDR_SUBNET: 1084 case IPSEC_ID_IPV6_ADDR: 1085 case IPSEC_ID_IPV6_ADDR_SUBNET: 1086 break; 1087 1088 case IPSEC_ID_FQDN: 1089 /* 1090 * FQDN may be used for in NAT-T with transport mode. 1091 * We can handle the message in this case. In the 1092 * other cases we'll drop the message later. 1093 */ 1094 break; 1095 1096 default: 1097 message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 1098 0, 1, 0); 1099 return -1; 1100 } 1101 } 1102 1103 /* Handle optional client ID payloads. */ 1104 idp = payload_first(msg, ISAKMP_PAYLOAD_ID); 1105 if (idp) { 1106 /* If IDci is there, IDcr must be too. */ 1107 if (!TAILQ_NEXT(idp, link)) { 1108 /* XXX Is this a good notify type? */ 1109 message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1110 1, 0); 1111 return -1; 1112 } 1113 /* XXX We should really compare, not override. */ 1114 ie->id_ci_sz = GET_ISAKMP_GEN_LENGTH(idp->p); 1115 ie->id_ci = malloc(ie->id_ci_sz); 1116 if (!ie->id_ci) { 1117 log_error("initiator_recv_HASH_SA_NONCE: " 1118 "malloc (%lu) failed", 1119 (unsigned long)ie->id_ci_sz); 1120 return -1; 1121 } 1122 memcpy(ie->id_ci, idp->p, ie->id_ci_sz); 1123 idp->flags |= PL_MARK; 1124 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1125 "initiator_recv_HASH_SA_NONCE: IDci", 1126 ie->id_ci + ISAKMP_GEN_SZ, ie->id_ci_sz - ISAKMP_GEN_SZ)); 1127 1128 idp = TAILQ_NEXT(idp, link); 1129 ie->id_cr_sz = GET_ISAKMP_GEN_LENGTH(idp->p); 1130 ie->id_cr = malloc(ie->id_cr_sz); 1131 if (!ie->id_cr) { 1132 log_error("initiator_recv_HASH_SA_NONCE: " 1133 "malloc (%lu) failed", 1134 (unsigned long)ie->id_cr_sz); 1135 return -1; 1136 } 1137 memcpy(ie->id_cr, idp->p, ie->id_cr_sz); 1138 idp->flags |= PL_MARK; 1139 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1140 "initiator_recv_HASH_SA_NONCE: IDcr", 1141 ie->id_cr + ISAKMP_GEN_SZ, ie->id_cr_sz - ISAKMP_GEN_SZ)); 1142 } else { 1143 /* 1144 * If client identifiers are not present in the exchange, 1145 * we fake them. RFC 2409 states: 1146 * The identities of the SAs negotiated in Quick Mode are 1147 * implicitly assumed to be the IP addresses of the ISAKMP 1148 * peers, without any constraints on the protocol or port 1149 * numbers allowed, unless client identifiers are specified 1150 * in Quick Mode. 1151 * 1152 * -- Michael Paddon (mwp@aba.net.au) 1153 */ 1154 1155 ie->flags = IPSEC_EXCH_FLAG_NO_ID; 1156 1157 /* Get initiator and responder addresses. */ 1158 msg->transport->vtbl->get_src(msg->transport, &src); 1159 msg->transport->vtbl->get_dst(msg->transport, &dst); 1160 ie->id_ci_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(src); 1161 ie->id_cr_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(dst); 1162 ie->id_ci = calloc(ie->id_ci_sz, sizeof(char)); 1163 ie->id_cr = calloc(ie->id_cr_sz, sizeof(char)); 1164 1165 if (!ie->id_ci || !ie->id_cr) { 1166 log_error("initiator_recv_HASH_SA_NONCE: " 1167 "calloc (%lu, %lu) failed", 1168 (unsigned long)ie->id_cr_sz, 1169 (unsigned long)sizeof(char)); 1170 free(ie->id_ci); 1171 ie->id_ci = 0; 1172 free(ie->id_cr); 1173 ie->id_cr = 0; 1174 return -1; 1175 } 1176 if (src->sa_family != dst->sa_family) { 1177 log_error("initiator_recv_HASH_SA_NONCE: " 1178 "sa_family mismatch"); 1179 free(ie->id_ci); 1180 ie->id_ci = 0; 1181 free(ie->id_cr); 1182 ie->id_cr = 0; 1183 return -1; 1184 } 1185 switch (src->sa_family) { 1186 case AF_INET: 1187 SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV4_ADDR); 1188 SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV4_ADDR); 1189 break; 1190 1191 case AF_INET6: 1192 SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV6_ADDR); 1193 SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV6_ADDR); 1194 break; 1195 1196 default: 1197 log_error("initiator_recv_HASH_SA_NONCE: " 1198 "unknown sa_family %d", src->sa_family); 1199 free(ie->id_ci); 1200 ie->id_ci = 0; 1201 free(ie->id_cr); 1202 ie->id_cr = 0; 1203 return -1; 1204 } 1205 memcpy(ie->id_ci + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), 1206 sockaddr_addrlen(src)); 1207 memcpy(ie->id_cr + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(dst), 1208 sockaddr_addrlen(dst)); 1209 } 1210 1211 /* Build the protection suite in our SA. */ 1212 TAILQ_FOREACH(xf, &msg->payload[ISAKMP_PAYLOAD_TRANSFORM], link) { 1213 /* 1214 * XXX We could check that the proposal each transform 1215 * belongs to is unique. 1216 */ 1217 1218 if (sa_add_transform(sa, xf, exchange->initiator, &proto)) 1219 return -1; 1220 1221 /* XXX Check that the chosen transform matches an offer. */ 1222 1223 ipsec_decode_transform(msg, sa, proto, xf->p); 1224 } 1225 1226 /* Now remove offers that we don't need anymore. */ 1227 for (proto = TAILQ_FIRST(&sa->protos); proto; proto = next_proto) { 1228 next_proto = TAILQ_NEXT(proto, link); 1229 if (!proto->chosen) 1230 proto_free(proto); 1231 } 1232 1233 if (!check_policy(exchange, sa, msg->isakmp_sa)) { 1234 message_drop(msg, ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); 1235 log_print("initiator_recv_HASH_SA_NONCE: policy check failed"); 1236 return -1; 1237 } 1238 1239 /* Mark the SA as handled. */ 1240 sa_p->flags |= PL_MARK; 1241 1242 isa = sa->data; 1243 if ((isa->group_desc && 1244 (!ie->group || ie->group->id != isa->group_desc)) || 1245 (!isa->group_desc && ie->group)) { 1246 log_print("initiator_recv_HASH_SA_NONCE: disagreement on PFS"); 1247 return -1; 1248 } 1249 /* Copy out the initiator's nonce. */ 1250 if (exchange_save_nonce(msg)) 1251 return -1; 1252 1253 /* Handle the optional KEY_EXCH payload. */ 1254 if (kep && ipsec_save_g_x(msg)) 1255 return -1; 1256 1257 return 0; 1258 } 1259 1260 static int 1261 initiator_send_HASH(struct message *msg) 1262 { 1263 struct exchange *exchange = msg->exchange; 1264 struct ipsec_exch *ie = exchange->data; 1265 struct sa *isakmp_sa = msg->isakmp_sa; 1266 struct ipsec_sa *isa = isakmp_sa->data; 1267 struct prf *prf; 1268 u_int8_t *buf; 1269 struct hash *hash = hash_get(isa->hash); 1270 1271 /* 1272 * We want a HASH payload to start with. XXX Share with 1273 * ike_main_mode.c? 1274 */ 1275 buf = malloc(ISAKMP_HASH_SZ + hash->hashsize); 1276 if (!buf) { 1277 log_error("initiator_send_HASH: malloc (%lu) failed", 1278 ISAKMP_HASH_SZ + (unsigned long)hash->hashsize); 1279 return -1; 1280 } 1281 if (message_add_payload(msg, ISAKMP_PAYLOAD_HASH, buf, 1282 ISAKMP_HASH_SZ + hash->hashsize, 1)) { 1283 free(buf); 1284 return -1; 1285 } 1286 /* Allocate the prf and start calculating our HASH(3). XXX Share? */ 1287 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: SKEYID_a", 1288 isa->skeyid_a, isa->skeyid_len)); 1289 prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, 1290 isa->skeyid_len); 1291 if (!prf) 1292 return -1; 1293 prf->Init(prf->prfctx); 1294 prf->Update(prf->prfctx, (unsigned char *)"\0", 1); 1295 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: message_id", 1296 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1297 prf->Update(prf->prfctx, exchange->message_id, 1298 ISAKMP_HDR_MESSAGE_ID_LEN); 1299 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: NONCE_I_b", 1300 exchange->nonce_i, exchange->nonce_i_len)); 1301 prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); 1302 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: NONCE_R_b", 1303 exchange->nonce_r, exchange->nonce_r_len)); 1304 prf->Update(prf->prfctx, exchange->nonce_r, exchange->nonce_r_len); 1305 prf->Final(buf + ISAKMP_GEN_SZ, prf->prfctx); 1306 prf_free(prf); 1307 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: HASH(3)", 1308 buf + ISAKMP_GEN_SZ, hash->hashsize)); 1309 1310 if (ie->group) 1311 message_register_post_send(msg, gen_g_xy); 1312 1313 message_register_post_send(msg, post_quick_mode); 1314 1315 return 0; 1316 } 1317 1318 static void 1319 post_quick_mode(struct message *msg) 1320 { 1321 struct sa *isakmp_sa = msg->isakmp_sa; 1322 struct ipsec_sa *isa = isakmp_sa->data; 1323 struct exchange *exchange = msg->exchange; 1324 struct ipsec_exch *ie = exchange->data; 1325 struct prf *prf; 1326 struct sa *sa; 1327 struct proto *proto; 1328 struct ipsec_proto *iproto; 1329 u_int8_t *keymat; 1330 int i; 1331 1332 /* 1333 * Loop over all SA negotiations and do both an in- and an outgoing SA 1334 * per protocol. 1335 */ 1336 for (sa = TAILQ_FIRST(&exchange->sa_list); sa; 1337 sa = TAILQ_NEXT(sa, next)) { 1338 for (proto = TAILQ_FIRST(&sa->protos); proto; 1339 proto = TAILQ_NEXT(proto, link)) { 1340 if (proto->proto == IPSEC_PROTO_IPCOMP) 1341 continue; 1342 1343 iproto = proto->data; 1344 1345 /* 1346 * There are two SAs for each SA negotiation, 1347 * incoming and outgoing. 1348 */ 1349 for (i = 0; i < 2; i++) { 1350 prf = prf_alloc(isa->prf_type, isa->hash, 1351 isa->skeyid_d, isa->skeyid_len); 1352 if (!prf) { 1353 /* XXX What to do? */ 1354 continue; 1355 } 1356 ie->keymat_len = ipsec_keymat_length(proto); 1357 1358 /* 1359 * We need to roundup the length of the key 1360 * material buffer to a multiple of the PRF's 1361 * blocksize as it is generated in chunks of 1362 * that blocksize. 1363 */ 1364 iproto->keymat[i] 1365 = malloc(((ie->keymat_len + prf->blocksize - 1) 1366 / prf->blocksize) * prf->blocksize); 1367 if (!iproto->keymat[i]) { 1368 log_error("post_quick_mode: " 1369 "malloc (%lu) failed", 1370 (((unsigned long)ie->keymat_len + 1371 prf->blocksize - 1) / prf->blocksize) * 1372 prf->blocksize); 1373 /* XXX What more to do? */ 1374 free(prf); 1375 continue; 1376 } 1377 for (keymat = iproto->keymat[i]; 1378 keymat < iproto->keymat[i] + ie->keymat_len; 1379 keymat += prf->blocksize) { 1380 prf->Init(prf->prfctx); 1381 1382 if (keymat != iproto->keymat[i]) { 1383 /* 1384 * Hash in last round's 1385 * KEYMAT. 1386 */ 1387 LOG_DBG_BUF((LOG_NEGOTIATION, 1388 90, "post_quick_mode: " 1389 "last KEYMAT", 1390 keymat - prf->blocksize, 1391 prf->blocksize)); 1392 prf->Update(prf->prfctx, 1393 keymat - prf->blocksize, 1394 prf->blocksize); 1395 } 1396 /* If PFS is used hash in g^xy. */ 1397 if (ie->g_xy) { 1398 LOG_DBG_BUF((LOG_NEGOTIATION, 1399 90, "post_quick_mode: " 1400 "g^xy", ie->g_xy, 1401 ie->g_x_len)); 1402 prf->Update(prf->prfctx, 1403 ie->g_xy, ie->g_x_len); 1404 } 1405 LOG_DBG((LOG_NEGOTIATION, 90, 1406 "post_quick_mode: " 1407 "suite %d proto %d", proto->no, 1408 proto->proto)); 1409 prf->Update(prf->prfctx, &proto->proto, 1410 1); 1411 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1412 "post_quick_mode: SPI", 1413 proto->spi[i], proto->spi_sz[i])); 1414 prf->Update(prf->prfctx, 1415 proto->spi[i], proto->spi_sz[i]); 1416 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1417 "post_quick_mode: Ni_b", 1418 exchange->nonce_i, 1419 exchange->nonce_i_len)); 1420 prf->Update(prf->prfctx, 1421 exchange->nonce_i, 1422 exchange->nonce_i_len); 1423 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1424 "post_quick_mode: Nr_b", 1425 exchange->nonce_r, 1426 exchange->nonce_r_len)); 1427 prf->Update(prf->prfctx, 1428 exchange->nonce_r, 1429 exchange->nonce_r_len); 1430 prf->Final(keymat, prf->prfctx); 1431 } 1432 prf_free(prf); 1433 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1434 "post_quick_mode: KEYMAT", 1435 iproto->keymat[i], ie->keymat_len)); 1436 } 1437 } 1438 } 1439 1440 log_verbose("isakmpd: quick mode done%s: %s", 1441 (exchange->initiator == 0) ? " (as responder)" : "", 1442 !msg->isakmp_sa || !msg->isakmp_sa->transport ? "<no transport>" 1443 : msg->isakmp_sa->transport->vtbl->decode_ids 1444 (msg->isakmp_sa->transport)); 1445 } 1446 1447 /* 1448 * Accept a set of transforms offered by the initiator and chose one we can 1449 * handle. 1450 * XXX Describe in more detail. 1451 */ 1452 static int 1453 responder_recv_HASH_SA_NONCE(struct message *msg) 1454 { 1455 struct payload *hashp, *kep, *idp; 1456 struct sa *sa; 1457 struct sa *isakmp_sa = msg->isakmp_sa; 1458 struct ipsec_sa *isa = isakmp_sa->data; 1459 struct exchange *exchange = msg->exchange; 1460 struct ipsec_exch *ie = exchange->data; 1461 struct prf *prf; 1462 u_int8_t *hash, *my_hash = 0; 1463 size_t hash_len; 1464 u_int8_t *pkt = msg->iov[0].iov_base; 1465 u_int8_t group_desc = 0; 1466 int retval = -1; 1467 struct proto *proto; 1468 struct sockaddr *src, *dst; 1469 char *name; 1470 1471 hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); 1472 hash = hashp->p; 1473 hashp->flags |= PL_MARK; 1474 1475 /* The HASH payload should be the first one. */ 1476 if (hash != pkt + ISAKMP_HDR_SZ) { 1477 /* XXX Is there a better notification type? */ 1478 message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1, 0); 1479 goto cleanup; 1480 } 1481 hash_len = GET_ISAKMP_GEN_LENGTH(hash); 1482 my_hash = malloc(hash_len - ISAKMP_GEN_SZ); 1483 if (!my_hash) { 1484 log_error("responder_recv_HASH_SA_NONCE: malloc (%lu) failed", 1485 (unsigned long)hash_len - ISAKMP_GEN_SZ); 1486 goto cleanup; 1487 } 1488 /* 1489 * Check the payload's integrity. 1490 * XXX Share with ipsec_fill_in_hash? 1491 */ 1492 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH_SA_NONCE: " 1493 "SKEYID_a", isa->skeyid_a, isa->skeyid_len)); 1494 prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, 1495 isa->skeyid_len); 1496 if (!prf) 1497 goto cleanup; 1498 prf->Init(prf->prfctx); 1499 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1500 "responder_recv_HASH_SA_NONCE: message_id", 1501 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1502 prf->Update(prf->prfctx, exchange->message_id, 1503 ISAKMP_HDR_MESSAGE_ID_LEN); 1504 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1505 "responder_recv_HASH_SA_NONCE: message after HASH", 1506 hash + hash_len, 1507 msg->iov[0].iov_len - ISAKMP_HDR_SZ - hash_len)); 1508 prf->Update(prf->prfctx, hash + hash_len, 1509 msg->iov[0].iov_len - ISAKMP_HDR_SZ - hash_len); 1510 prf->Final(my_hash, prf->prfctx); 1511 prf_free(prf); 1512 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1513 "responder_recv_HASH_SA_NONCE: computed HASH(1)", my_hash, 1514 hash_len - ISAKMP_GEN_SZ)); 1515 if (memcmp(hash + ISAKMP_GEN_SZ, my_hash, hash_len - ISAKMP_GEN_SZ) 1516 != 0) { 1517 message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1518 1, 0); 1519 goto cleanup; 1520 } 1521 free(my_hash); 1522 my_hash = 0; 1523 1524 /* Mark message as authenticated. */ 1525 msg->flags |= MSG_AUTHENTICATED; 1526 1527 kep = payload_first(msg, ISAKMP_PAYLOAD_KEY_EXCH); 1528 if (kep) 1529 ie->pfs = 1; 1530 1531 /* Drop message when it contains ID types we do not implement yet. */ 1532 TAILQ_FOREACH(idp, &msg->payload[ISAKMP_PAYLOAD_ID], link) { 1533 switch (GET_ISAKMP_ID_TYPE(idp->p)) { 1534 case IPSEC_ID_IPV4_ADDR: 1535 case IPSEC_ID_IPV4_ADDR_SUBNET: 1536 case IPSEC_ID_IPV6_ADDR: 1537 case IPSEC_ID_IPV6_ADDR_SUBNET: 1538 break; 1539 1540 case IPSEC_ID_FQDN: 1541 /* 1542 * FQDN may be used for in NAT-T with transport mode. 1543 * We can handle the message in this case. In the 1544 * other cases we'll drop the message later. 1545 */ 1546 break; 1547 1548 default: 1549 message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 1550 0, 1, 0); 1551 goto cleanup; 1552 } 1553 } 1554 1555 /* Handle optional client ID payloads. */ 1556 idp = payload_first(msg, ISAKMP_PAYLOAD_ID); 1557 if (idp) { 1558 /* If IDci is there, IDcr must be too. */ 1559 if (!TAILQ_NEXT(idp, link)) { 1560 /* XXX Is this a good notify type? */ 1561 message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1562 1, 0); 1563 goto cleanup; 1564 } 1565 ie->id_ci_sz = GET_ISAKMP_GEN_LENGTH(idp->p); 1566 ie->id_ci = malloc(ie->id_ci_sz); 1567 if (!ie->id_ci) { 1568 log_error("responder_recv_HASH_SA_NONCE: " 1569 "malloc (%lu) failed", 1570 (unsigned long)ie->id_ci_sz); 1571 goto cleanup; 1572 } 1573 memcpy(ie->id_ci, idp->p, ie->id_ci_sz); 1574 idp->flags |= PL_MARK; 1575 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1576 "responder_recv_HASH_SA_NONCE: IDci", 1577 ie->id_ci + ISAKMP_GEN_SZ, ie->id_ci_sz - ISAKMP_GEN_SZ)); 1578 1579 idp = TAILQ_NEXT(idp, link); 1580 ie->id_cr_sz = GET_ISAKMP_GEN_LENGTH(idp->p); 1581 ie->id_cr = malloc(ie->id_cr_sz); 1582 if (!ie->id_cr) { 1583 log_error("responder_recv_HASH_SA_NONCE: " 1584 "malloc (%lu) failed", 1585 (unsigned long)ie->id_cr_sz); 1586 goto cleanup; 1587 } 1588 memcpy(ie->id_cr, idp->p, ie->id_cr_sz); 1589 idp->flags |= PL_MARK; 1590 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1591 "responder_recv_HASH_SA_NONCE: IDcr", 1592 ie->id_cr + ISAKMP_GEN_SZ, ie->id_cr_sz - ISAKMP_GEN_SZ)); 1593 } else { 1594 /* 1595 * If client identifiers are not present in the exchange, 1596 * we fake them. RFC 2409 states: 1597 * The identities of the SAs negotiated in Quick Mode are 1598 * implicitly assumed to be the IP addresses of the ISAKMP 1599 * peers, without any constraints on the protocol or port 1600 * numbers allowed, unless client identifiers are specified 1601 * in Quick Mode. 1602 * 1603 * -- Michael Paddon (mwp@aba.net.au) 1604 */ 1605 1606 ie->flags = IPSEC_EXCH_FLAG_NO_ID; 1607 1608 /* Get initiator and responder addresses. */ 1609 msg->transport->vtbl->get_src(msg->transport, &src); 1610 msg->transport->vtbl->get_dst(msg->transport, &dst); 1611 ie->id_ci_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(src); 1612 ie->id_cr_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(dst); 1613 ie->id_ci = calloc(ie->id_ci_sz, sizeof(char)); 1614 ie->id_cr = calloc(ie->id_cr_sz, sizeof(char)); 1615 1616 if (!ie->id_ci || !ie->id_cr) { 1617 log_error("responder_recv_HASH_SA_NONCE: " 1618 "calloc (%lu, %lu) failed", 1619 (unsigned long)ie->id_ci_sz, 1620 (unsigned long)sizeof(char)); 1621 goto cleanup; 1622 } 1623 if (src->sa_family != dst->sa_family) { 1624 log_error("initiator_recv_HASH_SA_NONCE: " 1625 "sa_family mismatch"); 1626 goto cleanup; 1627 } 1628 switch (src->sa_family) { 1629 case AF_INET: 1630 SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV4_ADDR); 1631 SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV4_ADDR); 1632 break; 1633 1634 case AF_INET6: 1635 SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV6_ADDR); 1636 SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV6_ADDR); 1637 break; 1638 1639 default: 1640 log_error("initiator_recv_HASH_SA_NONCE: " 1641 "unknown sa_family %d", src->sa_family); 1642 goto cleanup; 1643 } 1644 1645 memcpy(ie->id_cr + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), 1646 sockaddr_addrlen(src)); 1647 memcpy(ie->id_ci + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(dst), 1648 sockaddr_addrlen(dst)); 1649 } 1650 1651 if (message_negotiate_sa(msg, check_policy)) 1652 goto cleanup; 1653 1654 for (sa = TAILQ_FIRST(&exchange->sa_list); sa; 1655 sa = TAILQ_NEXT(sa, next)) { 1656 for (proto = TAILQ_FIRST(&sa->protos); proto; 1657 proto = TAILQ_NEXT(proto, link)) { 1658 /* 1659 * XXX we need to have some attributes per proto, not 1660 * all per SA. 1661 */ 1662 ipsec_decode_transform(msg, sa, proto, 1663 proto->chosen->p); 1664 if (proto->proto == IPSEC_PROTO_IPSEC_AH && 1665 !((struct ipsec_proto *)proto->data)->auth) { 1666 log_print("responder_recv_HASH_SA_NONCE: " 1667 "AH proposed without an algorithm " 1668 "attribute"); 1669 message_drop(msg, 1670 ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); 1671 goto next_sa; 1672 } 1673 } 1674 1675 isa = sa->data; 1676 1677 /* 1678 * The group description is mandatory if we got a KEY_EXCH 1679 * payload. 1680 */ 1681 if (kep) { 1682 if (!isa->group_desc) { 1683 log_print("responder_recv_HASH_SA_NONCE: " 1684 "KEY_EXCH payload without a group " 1685 "desc. attribute"); 1686 message_drop(msg, 1687 ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); 1688 continue; 1689 } 1690 /* Also, all SAs must have equal groups. */ 1691 if (!group_desc) 1692 group_desc = isa->group_desc; 1693 else if (group_desc != isa->group_desc) { 1694 log_print("responder_recv_HASH_SA_NONCE: " 1695 "differing group descriptions in one QM"); 1696 message_drop(msg, 1697 ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); 1698 continue; 1699 } 1700 } 1701 /* At least one SA was accepted. */ 1702 retval = 0; 1703 1704 next_sa: 1705 ; /* XXX gcc3 wants this. */ 1706 } 1707 1708 if (kep) { 1709 ie->group = group_get(group_desc); 1710 if (!ie->group) { 1711 /* 1712 * XXX If the error was due to an out-of-range group 1713 * description we should notify our peer, but this 1714 * should probably be done by the attribute 1715 * validation. Is it? 1716 */ 1717 goto cleanup; 1718 } 1719 } 1720 /* Copy out the initiator's nonce. */ 1721 if (exchange_save_nonce(msg)) 1722 goto cleanup; 1723 1724 /* Handle the optional KEY_EXCH payload. */ 1725 if (kep && ipsec_save_g_x(msg)) 1726 goto cleanup; 1727 1728 /* 1729 * Try to find and set the connection name on the exchange. 1730 */ 1731 1732 /* 1733 * Check for accepted identities as well as lookup the connection 1734 * name and set it on the exchange. 1735 * 1736 * When not using policies make sure the peer proposes sane IDs. 1737 * Otherwise this is done by KeyNote. 1738 */ 1739 name = connection_passive_lookup_by_ids(ie->id_ci, ie->id_cr); 1740 if (name) { 1741 exchange->name = strdup(name); 1742 if (!exchange->name) { 1743 log_error("responder_recv_HASH_SA_NONCE: " 1744 "strdup (\"%s\") failed", name); 1745 goto cleanup; 1746 } 1747 } else if ( 1748 ignore_policy || 1749 strncmp("yes", conf_get_str("General", "Use-Keynote"), 3)) { 1750 log_print("responder_recv_HASH_SA_NONCE: peer proposed " 1751 "invalid phase 2 IDs: %s", 1752 (exchange->doi->decode_ids("initiator id %s, responder" 1753 " id %s", ie->id_ci, ie->id_ci_sz, ie->id_cr, 1754 ie->id_cr_sz, 1))); 1755 message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 0, 1, 1756 0); 1757 goto cleanup; 1758 } 1759 1760 return retval; 1761 1762 cleanup: 1763 /* Remove all potential protocols that have been added to the SAs. */ 1764 for (sa = TAILQ_FIRST(&exchange->sa_list); sa; 1765 sa = TAILQ_NEXT(sa, next)) 1766 while ((proto = TAILQ_FIRST(&sa->protos)) != 0) 1767 proto_free(proto); 1768 free(my_hash); 1769 free(ie->id_ci); 1770 ie->id_ci = 0; 1771 free(ie->id_cr); 1772 ie->id_cr = 0; 1773 return -1; 1774 } 1775 1776 /* Reply with the transform we chose. */ 1777 static int 1778 responder_send_HASH_SA_NONCE(struct message *msg) 1779 { 1780 struct exchange *exchange = msg->exchange; 1781 struct ipsec_exch *ie = exchange->data; 1782 struct sa *isakmp_sa = msg->isakmp_sa; 1783 struct ipsec_sa *isa = isakmp_sa->data; 1784 struct prf *prf; 1785 struct hash *hash = hash_get(isa->hash); 1786 size_t nonce_sz = exchange->nonce_i_len; 1787 u_int8_t *buf; 1788 int initiator = exchange->initiator; 1789 char header[80]; 1790 u_int32_t i; 1791 u_int8_t *id; 1792 size_t sz; 1793 1794 /* 1795 * We want a HASH payload to start with. XXX Share with 1796 * ike_main_mode.c? 1797 */ 1798 buf = malloc(ISAKMP_HASH_SZ + hash->hashsize); 1799 if (!buf) { 1800 log_error("responder_send_HASH_SA_NONCE: malloc (%lu) failed", 1801 ISAKMP_HASH_SZ + (unsigned long)hash->hashsize); 1802 return -1; 1803 } 1804 if (message_add_payload(msg, ISAKMP_PAYLOAD_HASH, buf, 1805 ISAKMP_HASH_SZ + hash->hashsize, 1)) { 1806 free(buf); 1807 return -1; 1808 } 1809 /* Add the SA payload(s) with the transform(s) that was/were chosen. */ 1810 if (message_add_sa_payload(msg)) 1811 return -1; 1812 1813 /* Generate a nonce, and add it to the message. */ 1814 if (exchange_gen_nonce(msg, nonce_sz)) 1815 return -1; 1816 1817 /* Generate optional KEY_EXCH payload. This is known as PFS. */ 1818 if (ie->group && ipsec_gen_g_x(msg)) 1819 return -1; 1820 1821 /* 1822 * If the initiator client ID's were acceptable, just mirror them 1823 * back. 1824 */ 1825 if (!(ie->flags & IPSEC_EXCH_FLAG_NO_ID)) { 1826 sz = ie->id_ci_sz; 1827 id = malloc(sz); 1828 if (!id) { 1829 log_error("responder_send_HASH_SA_NONCE: " 1830 "malloc (%lu) failed", (unsigned long)sz); 1831 return -1; 1832 } 1833 memcpy(id, ie->id_ci, sz); 1834 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1835 "responder_send_HASH_SA_NONCE: IDic", id, sz)); 1836 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 1837 free(id); 1838 return -1; 1839 } 1840 sz = ie->id_cr_sz; 1841 id = malloc(sz); 1842 if (!id) { 1843 log_error("responder_send_HASH_SA_NONCE: " 1844 "malloc (%lu) failed", (unsigned long)sz); 1845 return -1; 1846 } 1847 memcpy(id, ie->id_cr, sz); 1848 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1849 "responder_send_HASH_SA_NONCE: IDrc", id, sz)); 1850 if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { 1851 free(id); 1852 return -1; 1853 } 1854 } 1855 /* Allocate the prf and start calculating our HASH(2). XXX Share? */ 1856 LOG_DBG((LOG_NEGOTIATION, 90, "responder_recv_HASH: " 1857 "isakmp_sa %p isa %p", isakmp_sa, isa)); 1858 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: " 1859 "SKEYID_a", isa->skeyid_a, isa->skeyid_len)); 1860 prf = prf_alloc(isa->prf_type, hash->type, isa->skeyid_a, 1861 isa->skeyid_len); 1862 if (!prf) 1863 return -1; 1864 prf->Init(prf->prfctx); 1865 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1866 "responder_send_HASH_SA_NONCE: message_id", 1867 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1868 prf->Update(prf->prfctx, exchange->message_id, 1869 ISAKMP_HDR_MESSAGE_ID_LEN); 1870 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: " 1871 "NONCE_I_b", exchange->nonce_i, exchange->nonce_i_len)); 1872 prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); 1873 1874 /* Loop over all payloads after HASH(2). */ 1875 for (i = 2; i < msg->iovlen; i++) { 1876 /* XXX Misleading payload type printouts. */ 1877 snprintf(header, sizeof header, 1878 "responder_send_HASH_SA_NONCE: payload %d after HASH(2)", 1879 i - 1); 1880 LOG_DBG_BUF((LOG_NEGOTIATION, 90, header, msg->iov[i].iov_base, 1881 msg->iov[i].iov_len)); 1882 prf->Update(prf->prfctx, msg->iov[i].iov_base, 1883 msg->iov[i].iov_len); 1884 } 1885 prf->Final(buf + ISAKMP_HASH_DATA_OFF, prf->prfctx); 1886 prf_free(prf); 1887 snprintf(header, sizeof header, "responder_send_HASH_SA_NONCE: " 1888 "HASH_%c", initiator ? 'I' : 'R'); 1889 LOG_DBG_BUF((LOG_NEGOTIATION, 80, header, buf + ISAKMP_HASH_DATA_OFF, 1890 hash->hashsize)); 1891 1892 if (ie->group) 1893 message_register_post_send(msg, gen_g_xy); 1894 1895 return 0; 1896 } 1897 1898 static void 1899 gen_g_xy(struct message *msg) 1900 { 1901 struct exchange *exchange = msg->exchange; 1902 struct ipsec_exch *ie = exchange->data; 1903 1904 /* Compute Diffie-Hellman shared value. */ 1905 ie->g_xy = malloc(ie->g_x_len); 1906 if (!ie->g_xy) { 1907 log_error("gen_g_xy: malloc (%lu) failed", 1908 (unsigned long)ie->g_x_len); 1909 return; 1910 } 1911 if (dh_create_shared(ie->group, ie->g_xy, 1912 exchange->initiator ? ie->g_xr : ie->g_xi)) { 1913 log_print("gen_g_xy: dh_create_shared failed"); 1914 return; 1915 } 1916 LOG_DBG_BUF((LOG_NEGOTIATION, 80, "gen_g_xy: g^xy", ie->g_xy, 1917 ie->g_x_len)); 1918 } 1919 1920 static int 1921 responder_recv_HASH(struct message *msg) 1922 { 1923 struct exchange *exchange = msg->exchange; 1924 struct sa *isakmp_sa = msg->isakmp_sa; 1925 struct ipsec_sa *isa = isakmp_sa->data; 1926 struct prf *prf; 1927 u_int8_t *hash, *my_hash = 0; 1928 size_t hash_len; 1929 struct payload *hashp; 1930 1931 /* Find HASH(3) and create our own hash, just as big. */ 1932 hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); 1933 hash = hashp->p; 1934 hashp->flags |= PL_MARK; 1935 hash_len = GET_ISAKMP_GEN_LENGTH(hash); 1936 my_hash = malloc(hash_len - ISAKMP_GEN_SZ); 1937 if (!my_hash) { 1938 log_error("responder_recv_HASH: malloc (%lu) failed", 1939 (unsigned long)hash_len - ISAKMP_GEN_SZ); 1940 goto cleanup; 1941 } 1942 /* Allocate the prf and start calculating our HASH(3). XXX Share? */ 1943 LOG_DBG((LOG_NEGOTIATION, 90, "responder_recv_HASH: " 1944 "isakmp_sa %p isa %p", isakmp_sa, isa)); 1945 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: SKEYID_a", 1946 isa->skeyid_a, isa->skeyid_len)); 1947 prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, 1948 isa->skeyid_len); 1949 if (!prf) 1950 goto cleanup; 1951 prf->Init(prf->prfctx); 1952 prf->Update(prf->prfctx, (unsigned char *)"\0", 1); 1953 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: message_id", 1954 exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); 1955 prf->Update(prf->prfctx, exchange->message_id, 1956 ISAKMP_HDR_MESSAGE_ID_LEN); 1957 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: NONCE_I_b", 1958 exchange->nonce_i, exchange->nonce_i_len)); 1959 prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); 1960 LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: NONCE_R_b", 1961 exchange->nonce_r, exchange->nonce_r_len)); 1962 prf->Update(prf->prfctx, exchange->nonce_r, exchange->nonce_r_len); 1963 prf->Final(my_hash, prf->prfctx); 1964 prf_free(prf); 1965 LOG_DBG_BUF((LOG_NEGOTIATION, 90, 1966 "responder_recv_HASH: computed HASH(3)", my_hash, 1967 hash_len - ISAKMP_GEN_SZ)); 1968 if (memcmp(hash + ISAKMP_GEN_SZ, my_hash, hash_len - ISAKMP_GEN_SZ) 1969 != 0) { 1970 message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1971 1, 0); 1972 goto cleanup; 1973 } 1974 free(my_hash); 1975 1976 /* Mark message as authenticated. */ 1977 msg->flags |= MSG_AUTHENTICATED; 1978 1979 post_quick_mode(msg); 1980 1981 return 0; 1982 1983 cleanup: 1984 free(my_hash); 1985 return -1; 1986 } 1987