1 /* $NetBSD: oakley.c,v 1.9.6.4 2009/08/13 09:18:45 vanhu Exp $ */ 2 3 /* Id: oakley.c,v 1.32 2006/05/26 12:19:46 manubsd Exp */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "config.h" 35 36 #include <sys/types.h> 37 #include <sys/param.h> 38 #include <sys/socket.h> /* XXX for subjectaltname */ 39 #include <netinet/in.h> /* XXX for subjectaltname */ 40 41 #include <openssl/x509.h> 42 #include <openssl/err.h> 43 44 #if !defined(OPENSSL_IS_BORINGSSL) 45 #include <openssl/engine.h> 46 #include <openssl/pkcs7.h> 47 #else 48 #include <openssl/bytestring.h> 49 #endif 50 51 #include <stdlib.h> 52 #include <stdio.h> 53 #include <string.h> 54 #include <errno.h> 55 56 #if TIME_WITH_SYS_TIME 57 # include <sys/time.h> 58 # include <time.h> 59 #else 60 # if HAVE_SYS_TIME_H 61 # include <sys/time.h> 62 # else 63 # include <time.h> 64 # endif 65 #endif 66 #ifdef ENABLE_HYBRID 67 #include <resolv.h> 68 #endif 69 70 #include "var.h" 71 #include "misc.h" 72 #include "vmbuf.h" 73 #include "str2val.h" 74 #include "plog.h" 75 #include "debug.h" 76 77 #include "isakmp_var.h" 78 #include "isakmp.h" 79 #ifdef ENABLE_HYBRID 80 #include "isakmp_xauth.h" 81 #include "isakmp_cfg.h" 82 #endif 83 #include "oakley.h" 84 #include "admin.h" 85 #include "privsep.h" 86 #include "localconf.h" 87 #include "remoteconf.h" 88 #include "policy.h" 89 #include "handler.h" 90 #include "ipsec_doi.h" 91 #include "algorithm.h" 92 #include "dhgroup.h" 93 #include "sainfo.h" 94 #include "proposal.h" 95 #include "crypto_openssl.h" 96 #include "dnssec.h" 97 #include "sockmisc.h" 98 #include "strnames.h" 99 #include "gcmalloc.h" 100 #include "rsalist.h" 101 102 #ifdef HAVE_GSSAPI 103 #include "gssapi.h" 104 #endif 105 106 #define OUTBOUND_SA 0 107 #define INBOUND_SA 1 108 109 #define INITDHVAL(a, s, d, t) \ 110 do { \ 111 vchar_t buf; \ 112 buf.v = str2val((s), 16, &buf.l); \ 113 memset(&a, 0, sizeof(struct dhgroup)); \ 114 a.type = (t); \ 115 a.prime = vdup(&buf); \ 116 a.gen1 = 2; \ 117 a.gen2 = 0; \ 118 racoon_free(buf.v); \ 119 } while(0); 120 121 struct dhgroup dh_modp768; 122 struct dhgroup dh_modp1024; 123 struct dhgroup dh_modp1536; 124 struct dhgroup dh_modp2048; 125 struct dhgroup dh_modp3072; 126 struct dhgroup dh_modp4096; 127 struct dhgroup dh_modp6144; 128 struct dhgroup dh_modp8192; 129 130 131 static int oakley_check_dh_pub __P((vchar_t *, vchar_t **)); 132 static int oakley_compute_keymat_x __P((struct ph2handle *, int, int)); 133 static int get_cert_fromlocal __P((struct ph1handle *, int)); 134 static int get_plainrsa_fromlocal __P((struct ph1handle *, int)); 135 static int oakley_check_certid __P((struct ph1handle *iph1)); 136 static int check_typeofcertname __P((int, int)); 137 static cert_t *save_certbuf __P((struct isakmp_gen *)); 138 static cert_t *save_certx509 __P((X509 *)); 139 static int oakley_padlen __P((int, int)); 140 141 int 142 oakley_get_defaultlifetime() 143 { 144 return OAKLEY_ATTR_SA_LD_SEC_DEFAULT; 145 } 146 147 int 148 oakley_dhinit() 149 { 150 /* set DH MODP */ 151 INITDHVAL(dh_modp768, OAKLEY_PRIME_MODP768, 152 OAKLEY_ATTR_GRP_DESC_MODP768, OAKLEY_ATTR_GRP_TYPE_MODP); 153 INITDHVAL(dh_modp1024, OAKLEY_PRIME_MODP1024, 154 OAKLEY_ATTR_GRP_DESC_MODP1024, OAKLEY_ATTR_GRP_TYPE_MODP); 155 INITDHVAL(dh_modp1536, OAKLEY_PRIME_MODP1536, 156 OAKLEY_ATTR_GRP_DESC_MODP1536, OAKLEY_ATTR_GRP_TYPE_MODP); 157 INITDHVAL(dh_modp2048, OAKLEY_PRIME_MODP2048, 158 OAKLEY_ATTR_GRP_DESC_MODP2048, OAKLEY_ATTR_GRP_TYPE_MODP); 159 INITDHVAL(dh_modp3072, OAKLEY_PRIME_MODP3072, 160 OAKLEY_ATTR_GRP_DESC_MODP3072, OAKLEY_ATTR_GRP_TYPE_MODP); 161 INITDHVAL(dh_modp4096, OAKLEY_PRIME_MODP4096, 162 OAKLEY_ATTR_GRP_DESC_MODP4096, OAKLEY_ATTR_GRP_TYPE_MODP); 163 INITDHVAL(dh_modp6144, OAKLEY_PRIME_MODP6144, 164 OAKLEY_ATTR_GRP_DESC_MODP6144, OAKLEY_ATTR_GRP_TYPE_MODP); 165 INITDHVAL(dh_modp8192, OAKLEY_PRIME_MODP8192, 166 OAKLEY_ATTR_GRP_DESC_MODP8192, OAKLEY_ATTR_GRP_TYPE_MODP); 167 168 return 0; 169 } 170 171 void 172 oakley_dhgrp_free(dhgrp) 173 struct dhgroup *dhgrp; 174 { 175 if (dhgrp->prime) 176 vfree(dhgrp->prime); 177 if (dhgrp->curve_a) 178 vfree(dhgrp->curve_a); 179 if (dhgrp->curve_b) 180 vfree(dhgrp->curve_b); 181 if (dhgrp->order) 182 vfree(dhgrp->order); 183 racoon_free(dhgrp); 184 } 185 186 /* 187 * RFC2409 5 188 * The length of the Diffie-Hellman public value MUST be equal to the 189 * length of the prime modulus over which the exponentiation was 190 * performed, prepending zero bits to the value if necessary. 191 */ 192 static int 193 oakley_check_dh_pub(prime, pub0) 194 vchar_t *prime, **pub0; 195 { 196 vchar_t *tmp; 197 vchar_t *pub = *pub0; 198 199 if (prime->l == pub->l) 200 return 0; 201 202 if (prime->l < pub->l) { 203 /* what should i do ? */ 204 plog(LLV_ERROR, LOCATION, NULL, 205 "invalid public information was generated.\n"); 206 return -1; 207 } 208 209 /* prime->l > pub->l */ 210 tmp = vmalloc(prime->l); 211 if (tmp == NULL) { 212 plog(LLV_ERROR, LOCATION, NULL, 213 "failed to get DH buffer.\n"); 214 return -1; 215 } 216 memcpy(tmp->v + prime->l - pub->l, pub->v, pub->l); 217 218 vfree(*pub0); 219 *pub0 = tmp; 220 221 return 0; 222 } 223 224 /* 225 * compute sharing secret of DH 226 * IN: *dh, *pub, *priv, *pub_p 227 * OUT: **gxy 228 */ 229 int 230 oakley_dh_compute(dh, pub, priv, pub_p, gxy) 231 const struct dhgroup *dh; 232 vchar_t *pub, *priv, *pub_p, **gxy; 233 { 234 #ifdef ENABLE_STATS 235 struct timeval start, end; 236 #endif 237 if ((*gxy = vmalloc(dh->prime->l)) == NULL) { 238 plog(LLV_ERROR, LOCATION, NULL, 239 "failed to get DH buffer.\n"); 240 return -1; 241 } 242 243 #ifdef ENABLE_STATS 244 gettimeofday(&start, NULL); 245 #endif 246 switch (dh->type) { 247 case OAKLEY_ATTR_GRP_TYPE_MODP: 248 if (eay_dh_compute(dh->prime, dh->gen1, pub, priv, pub_p, gxy) < 0) { 249 plog(LLV_ERROR, LOCATION, NULL, 250 "failed to compute dh value.\n"); 251 return -1; 252 } 253 break; 254 case OAKLEY_ATTR_GRP_TYPE_ECP: 255 case OAKLEY_ATTR_GRP_TYPE_EC2N: 256 plog(LLV_ERROR, LOCATION, NULL, 257 "dh type %d isn't supported.\n", dh->type); 258 return -1; 259 default: 260 plog(LLV_ERROR, LOCATION, NULL, 261 "invalid dh type %d.\n", dh->type); 262 return -1; 263 } 264 265 #ifdef ENABLE_STATS 266 gettimeofday(&end, NULL); 267 syslog(LOG_NOTICE, "%s(%s%zu): %8.6f", __func__, 268 s_attr_isakmp_group(dh->type), dh->prime->l << 3, 269 timedelta(&start, &end)); 270 #endif 271 272 plog(LLV_DEBUG, LOCATION, NULL, "compute DH's shared.\n"); 273 plogdump(LLV_DEBUG, (*gxy)->v, (*gxy)->l); 274 275 return 0; 276 } 277 278 /* 279 * generate values of DH 280 * IN: *dh 281 * OUT: **pub, **priv 282 */ 283 int 284 oakley_dh_generate(dh, pub, priv) 285 const struct dhgroup *dh; 286 vchar_t **pub, **priv; 287 { 288 #ifdef ENABLE_STATS 289 struct timeval start, end; 290 gettimeofday(&start, NULL); 291 #endif 292 switch (dh->type) { 293 case OAKLEY_ATTR_GRP_TYPE_MODP: 294 if (eay_dh_generate(dh->prime, dh->gen1, dh->gen2, pub, priv) < 0) { 295 plog(LLV_ERROR, LOCATION, NULL, 296 "failed to compute dh value.\n"); 297 return -1; 298 } 299 break; 300 301 case OAKLEY_ATTR_GRP_TYPE_ECP: 302 case OAKLEY_ATTR_GRP_TYPE_EC2N: 303 plog(LLV_ERROR, LOCATION, NULL, 304 "dh type %d isn't supported.\n", dh->type); 305 return -1; 306 default: 307 plog(LLV_ERROR, LOCATION, NULL, 308 "invalid dh type %d.\n", dh->type); 309 return -1; 310 } 311 312 #ifdef ENABLE_STATS 313 gettimeofday(&end, NULL); 314 syslog(LOG_NOTICE, "%s(%s%zu): %8.6f", __func__, 315 s_attr_isakmp_group(dh->type), dh->prime->l << 3, 316 timedelta(&start, &end)); 317 #endif 318 319 if (oakley_check_dh_pub(dh->prime, pub) != 0) 320 return -1; 321 322 plog(LLV_DEBUG, LOCATION, NULL, "compute DH's private.\n"); 323 plogdump(LLV_DEBUG, (*priv)->v, (*priv)->l); 324 plog(LLV_DEBUG, LOCATION, NULL, "compute DH's public.\n"); 325 plogdump(LLV_DEBUG, (*pub)->v, (*pub)->l); 326 327 return 0; 328 } 329 330 /* 331 * copy pre-defined dhgroup values. 332 */ 333 int 334 oakley_setdhgroup(group, dhgrp) 335 int group; 336 struct dhgroup **dhgrp; 337 { 338 struct dhgroup *g; 339 340 *dhgrp = NULL; /* just make sure, initialize */ 341 342 g = alg_oakley_dhdef_group(group); 343 if (g == NULL) { 344 plog(LLV_ERROR, LOCATION, NULL, 345 "invalid DH parameter grp=%d.\n", group); 346 return -1; 347 } 348 349 if (!g->type || !g->prime || !g->gen1) { 350 /* unsuported */ 351 plog(LLV_ERROR, LOCATION, NULL, 352 "unsupported DH parameters grp=%d.\n", group); 353 return -1; 354 } 355 356 *dhgrp = racoon_calloc(1, sizeof(struct dhgroup)); 357 if (*dhgrp == NULL) { 358 plog(LLV_ERROR, LOCATION, NULL, 359 "failed to get DH buffer.\n"); 360 return 0; 361 } 362 363 /* set defined dh vlaues */ 364 memcpy(*dhgrp, g, sizeof(*g)); 365 (*dhgrp)->prime = vdup(g->prime); 366 367 return 0; 368 } 369 370 /* 371 * PRF 372 * 373 * NOTE: we do not support prf with different input/output bitwidth, 374 * so we do not implement RFC2409 Appendix B (DOORAK-MAC example) in 375 * oakley_compute_keymat(). If you add support for such prf function, 376 * modify oakley_compute_keymat() accordingly. 377 */ 378 vchar_t * 379 oakley_prf(key, buf, iph1) 380 vchar_t *key, *buf; 381 struct ph1handle *iph1; 382 { 383 vchar_t *res = NULL; 384 int type; 385 386 if (iph1->approval == NULL) { 387 /* 388 * it's before negotiating hash algorithm. 389 * We use md5 as default. 390 */ 391 type = OAKLEY_ATTR_HASH_ALG_MD5; 392 } else 393 type = iph1->approval->hashtype; 394 395 res = alg_oakley_hmacdef_one(type, key, buf); 396 if (res == NULL) { 397 plog(LLV_ERROR, LOCATION, NULL, 398 "invalid hmac algorithm %d.\n", type); 399 return NULL; 400 } 401 402 return res; 403 } 404 405 /* 406 * hash 407 */ 408 vchar_t * 409 oakley_hash(buf, iph1) 410 vchar_t *buf; 411 struct ph1handle *iph1; 412 { 413 vchar_t *res = NULL; 414 int type; 415 416 if (iph1->approval == NULL) { 417 /* 418 * it's before negotiating hash algorithm. 419 * We use md5 as default. 420 */ 421 type = OAKLEY_ATTR_HASH_ALG_MD5; 422 } else 423 type = iph1->approval->hashtype; 424 425 res = alg_oakley_hashdef_one(type, buf); 426 if (res == NULL) { 427 plog(LLV_ERROR, LOCATION, NULL, 428 "invalid hash algoriym %d.\n", type); 429 return NULL; 430 } 431 432 return res; 433 } 434 435 /* 436 * compute KEYMAT 437 * see seciton 5.5 Phase 2 - Quick Mode in isakmp-oakley-05. 438 */ 439 int 440 oakley_compute_keymat(iph2, side) 441 struct ph2handle *iph2; 442 int side; 443 { 444 int error = -1; 445 446 /* compute sharing secret of DH when PFS */ 447 if (iph2->approval->pfs_group && iph2->dhpub_p) { 448 if (oakley_dh_compute(iph2->pfsgrp, iph2->dhpub, 449 iph2->dhpriv, iph2->dhpub_p, &iph2->dhgxy) < 0) 450 goto end; 451 } 452 453 /* compute keymat */ 454 if (oakley_compute_keymat_x(iph2, side, INBOUND_SA) < 0 455 || oakley_compute_keymat_x(iph2, side, OUTBOUND_SA) < 0) 456 goto end; 457 458 plog(LLV_DEBUG, LOCATION, NULL, "KEYMAT computed.\n"); 459 460 error = 0; 461 462 end: 463 return error; 464 } 465 466 /* 467 * compute KEYMAT. 468 * KEYMAT = prf(SKEYID_d, protocol | SPI | Ni_b | Nr_b). 469 * If PFS is desired and KE payloads were exchanged, 470 * KEYMAT = prf(SKEYID_d, g(qm)^xy | protocol | SPI | Ni_b | Nr_b) 471 * 472 * NOTE: we do not support prf with different input/output bitwidth, 473 * so we do not implement RFC2409 Appendix B (DOORAK-MAC example). 474 */ 475 static int 476 oakley_compute_keymat_x(iph2, side, sa_dir) 477 struct ph2handle *iph2; 478 int side; 479 int sa_dir; 480 { 481 vchar_t *buf = NULL, *res = NULL, *bp; 482 char *p; 483 int len; 484 int error = -1; 485 int pfs = 0; 486 int dupkeymat; /* generate K[1-dupkeymat] */ 487 struct saproto *pr; 488 struct satrns *tr; 489 int encklen, authklen, l; 490 491 pfs = ((iph2->approval->pfs_group && iph2->dhgxy) ? 1 : 0); 492 493 len = pfs ? iph2->dhgxy->l : 0; 494 len += (1 495 + sizeof(u_int32_t) /* XXX SPI size */ 496 + iph2->nonce->l 497 + iph2->nonce_p->l); 498 buf = vmalloc(len); 499 if (buf == NULL) { 500 plog(LLV_ERROR, LOCATION, NULL, 501 "failed to get keymat buffer.\n"); 502 goto end; 503 } 504 505 for (pr = iph2->approval->head; pr != NULL; pr = pr->next) { 506 p = buf->v; 507 508 /* if PFS */ 509 if (pfs) { 510 memcpy(p, iph2->dhgxy->v, iph2->dhgxy->l); 511 p += iph2->dhgxy->l; 512 } 513 514 p[0] = pr->proto_id; 515 p += 1; 516 517 memcpy(p, (sa_dir == INBOUND_SA ? &pr->spi : &pr->spi_p), 518 sizeof(pr->spi)); 519 p += sizeof(pr->spi); 520 521 bp = (side == INITIATOR ? iph2->nonce : iph2->nonce_p); 522 memcpy(p, bp->v, bp->l); 523 p += bp->l; 524 525 bp = (side == INITIATOR ? iph2->nonce_p : iph2->nonce); 526 memcpy(p, bp->v, bp->l); 527 p += bp->l; 528 529 /* compute IV */ 530 plog(LLV_DEBUG, LOCATION, NULL, "KEYMAT compute with\n"); 531 plogdump(LLV_DEBUG, buf->v, buf->l); 532 533 /* res = K1 */ 534 res = oakley_prf(iph2->ph1->skeyid_d, buf, iph2->ph1); 535 if (res == NULL) 536 goto end; 537 538 /* compute key length needed */ 539 encklen = authklen = 0; 540 switch (pr->proto_id) { 541 case IPSECDOI_PROTO_IPSEC_ESP: 542 for (tr = pr->head; tr; tr = tr->next) { 543 l = alg_ipsec_encdef_keylen(tr->trns_id, 544 tr->encklen); 545 if (l > encklen) 546 encklen = l; 547 548 l = alg_ipsec_hmacdef_hashlen(tr->authtype); 549 if (l > authklen) 550 authklen = l; 551 } 552 break; 553 case IPSECDOI_PROTO_IPSEC_AH: 554 for (tr = pr->head; tr; tr = tr->next) { 555 l = alg_ipsec_hmacdef_hashlen(tr->trns_id); 556 if (l > authklen) 557 authklen = l; 558 } 559 break; 560 default: 561 break; 562 } 563 plog(LLV_DEBUG, LOCATION, NULL, "encklen=%d authklen=%d\n", 564 encklen, authklen); 565 566 dupkeymat = (encklen + authklen) / 8 / res->l; 567 dupkeymat += 2; /* safety mergin */ 568 if (dupkeymat < 3) 569 dupkeymat = 3; 570 plog(LLV_DEBUG, LOCATION, NULL, 571 "generating %zu bits of key (dupkeymat=%d)\n", 572 dupkeymat * 8 * res->l, dupkeymat); 573 if (0 < --dupkeymat) { 574 vchar_t *prev = res; /* K(n-1) */ 575 vchar_t *seed = NULL; /* seed for Kn */ 576 size_t l; 577 578 /* 579 * generating long key (isakmp-oakley-08 5.5) 580 * KEYMAT = K1 | K2 | K3 | ... 581 * where 582 * src = [ g(qm)^xy | ] protocol | SPI | Ni_b | Nr_b 583 * K1 = prf(SKEYID_d, src) 584 * K2 = prf(SKEYID_d, K1 | src) 585 * K3 = prf(SKEYID_d, K2 | src) 586 * Kn = prf(SKEYID_d, K(n-1) | src) 587 */ 588 plog(LLV_DEBUG, LOCATION, NULL, 589 "generating K1...K%d for KEYMAT.\n", 590 dupkeymat + 1); 591 592 seed = vmalloc(prev->l + buf->l); 593 if (seed == NULL) { 594 plog(LLV_ERROR, LOCATION, NULL, 595 "failed to get keymat buffer.\n"); 596 if (prev && prev != res) 597 vfree(prev); 598 goto end; 599 } 600 601 while (dupkeymat--) { 602 vchar_t *this = NULL; /* Kn */ 603 int update_prev; 604 605 memcpy(seed->v, prev->v, prev->l); 606 memcpy(seed->v + prev->l, buf->v, buf->l); 607 this = oakley_prf(iph2->ph1->skeyid_d, seed, 608 iph2->ph1); 609 if (!this) { 610 plog(LLV_ERROR, LOCATION, NULL, 611 "oakley_prf memory overflow\n"); 612 if (prev && prev != res) 613 vfree(prev); 614 vfree(this); 615 vfree(seed); 616 goto end; 617 } 618 619 update_prev = (prev && prev == res) ? 1 : 0; 620 621 l = res->l; 622 res = vrealloc(res, l + this->l); 623 624 if (update_prev) 625 prev = res; 626 627 if (res == NULL) { 628 plog(LLV_ERROR, LOCATION, NULL, 629 "failed to get keymat buffer.\n"); 630 if (prev && prev != res) 631 vfree(prev); 632 vfree(this); 633 vfree(seed); 634 goto end; 635 } 636 memcpy(res->v + l, this->v, this->l); 637 638 if (prev && prev != res) 639 vfree(prev); 640 prev = this; 641 this = NULL; 642 } 643 644 if (prev && prev != res) 645 vfree(prev); 646 vfree(seed); 647 } 648 649 plogdump(LLV_DEBUG, res->v, res->l); 650 651 if (sa_dir == INBOUND_SA) 652 pr->keymat = res; 653 else 654 pr->keymat_p = res; 655 res = NULL; 656 } 657 658 error = 0; 659 660 end: 661 if (error) { 662 for (pr = iph2->approval->head; pr != NULL; pr = pr->next) { 663 if (pr->keymat) { 664 vfree(pr->keymat); 665 pr->keymat = NULL; 666 } 667 if (pr->keymat_p) { 668 vfree(pr->keymat_p); 669 pr->keymat_p = NULL; 670 } 671 } 672 } 673 674 if (buf != NULL) 675 vfree(buf); 676 if (res) 677 vfree(res); 678 679 return error; 680 } 681 682 #if notyet 683 /* 684 * NOTE: Must terminate by NULL. 685 */ 686 vchar_t * 687 oakley_compute_hashx(struct ph1handle *iph1, ...) 688 { 689 vchar_t *buf, *res; 690 vchar_t *s; 691 caddr_t p; 692 int len; 693 694 va_list ap; 695 696 /* get buffer length */ 697 va_start(ap, iph1); 698 len = 0; 699 while ((s = va_arg(ap, vchar_t *)) != NULL) { 700 len += s->l 701 } 702 va_end(ap); 703 704 buf = vmalloc(len); 705 if (buf == NULL) { 706 plog(LLV_ERROR, LOCATION, NULL, 707 "failed to get hash buffer\n"); 708 return NULL; 709 } 710 711 /* set buffer */ 712 va_start(ap, iph1); 713 p = buf->v; 714 while ((s = va_arg(ap, char *)) != NULL) { 715 memcpy(p, s->v, s->l); 716 p += s->l; 717 } 718 va_end(ap); 719 720 plog(LLV_DEBUG, LOCATION, NULL, "HASH with: \n"); 721 plogdump(LLV_DEBUG, buf->v, buf->l); 722 723 /* compute HASH */ 724 res = oakley_prf(iph1->skeyid_a, buf, iph1); 725 vfree(buf); 726 if (res == NULL) 727 return NULL; 728 729 plog(LLV_DEBUG, LOCATION, NULL, "HASH computed:\n"); 730 plogdump(LLV_DEBUG, res->v, res->l); 731 732 return res; 733 } 734 #endif 735 736 /* 737 * compute HASH(3) prf(SKEYID_a, 0 | M-ID | Ni_b | Nr_b) 738 * see seciton 5.5 Phase 2 - Quick Mode in isakmp-oakley-05. 739 */ 740 vchar_t * 741 oakley_compute_hash3(iph1, msgid, body) 742 struct ph1handle *iph1; 743 u_int32_t msgid; 744 vchar_t *body; 745 { 746 vchar_t *buf = 0, *res = 0; 747 int len; 748 int error = -1; 749 750 /* create buffer */ 751 len = 1 + sizeof(u_int32_t) + body->l; 752 buf = vmalloc(len); 753 if (buf == NULL) { 754 plog(LLV_DEBUG, LOCATION, NULL, 755 "failed to get hash buffer\n"); 756 goto end; 757 } 758 759 buf->v[0] = 0; 760 761 memcpy(buf->v + 1, (char *)&msgid, sizeof(msgid)); 762 763 memcpy(buf->v + 1 + sizeof(u_int32_t), body->v, body->l); 764 765 plog(LLV_DEBUG, LOCATION, NULL, "HASH with: \n"); 766 plogdump(LLV_DEBUG, buf->v, buf->l); 767 768 /* compute HASH */ 769 res = oakley_prf(iph1->skeyid_a, buf, iph1); 770 if (res == NULL) 771 goto end; 772 773 error = 0; 774 775 plog(LLV_DEBUG, LOCATION, NULL, "HASH computed:\n"); 776 plogdump(LLV_DEBUG, res->v, res->l); 777 778 end: 779 if (buf != NULL) 780 vfree(buf); 781 return res; 782 } 783 784 /* 785 * compute HASH type of prf(SKEYID_a, M-ID | buffer) 786 * e.g. 787 * for quick mode HASH(1): 788 * prf(SKEYID_a, M-ID | SA | Ni [ | KE ] [ | IDci | IDcr ]) 789 * for quick mode HASH(2): 790 * prf(SKEYID_a, M-ID | Ni_b | SA | Nr [ | KE ] [ | IDci | IDcr ]) 791 * for Informational exchange: 792 * prf(SKEYID_a, M-ID | N/D) 793 */ 794 vchar_t * 795 oakley_compute_hash1(iph1, msgid, body) 796 struct ph1handle *iph1; 797 u_int32_t msgid; 798 vchar_t *body; 799 { 800 vchar_t *buf = NULL, *res = NULL; 801 char *p; 802 int len; 803 int error = -1; 804 805 /* create buffer */ 806 len = sizeof(u_int32_t) + body->l; 807 buf = vmalloc(len); 808 if (buf == NULL) { 809 plog(LLV_DEBUG, LOCATION, NULL, 810 "failed to get hash buffer\n"); 811 goto end; 812 } 813 814 p = buf->v; 815 816 memcpy(buf->v, (char *)&msgid, sizeof(msgid)); 817 p += sizeof(u_int32_t); 818 819 memcpy(p, body->v, body->l); 820 821 plog(LLV_DEBUG, LOCATION, NULL, "HASH with:\n"); 822 plogdump(LLV_DEBUG, buf->v, buf->l); 823 824 /* compute HASH */ 825 res = oakley_prf(iph1->skeyid_a, buf, iph1); 826 if (res == NULL) 827 goto end; 828 829 error = 0; 830 831 plog(LLV_DEBUG, LOCATION, NULL, "HASH computed:\n"); 832 plogdump(LLV_DEBUG, res->v, res->l); 833 834 end: 835 if (buf != NULL) 836 vfree(buf); 837 return res; 838 } 839 840 /* 841 * compute phase1 HASH 842 * main/aggressive 843 * I-digest = prf(SKEYID, g^i | g^r | CKY-I | CKY-R | SAi_b | ID_i1_b) 844 * R-digest = prf(SKEYID, g^r | g^i | CKY-R | CKY-I | SAi_b | ID_r1_b) 845 * for gssapi, also include all GSS tokens, and call gss_wrap on the result 846 */ 847 vchar_t * 848 oakley_ph1hash_common(iph1, sw) 849 struct ph1handle *iph1; 850 int sw; 851 { 852 vchar_t *buf = NULL, *res = NULL, *bp; 853 char *p, *bp2; 854 int len, bl; 855 int error = -1; 856 #ifdef HAVE_GSSAPI 857 vchar_t *gsstokens = NULL; 858 #endif 859 860 /* create buffer */ 861 len = iph1->dhpub->l 862 + iph1->dhpub_p->l 863 + sizeof(cookie_t) * 2 864 + iph1->sa->l 865 + (sw == GENERATE ? iph1->id->l : iph1->id_p->l); 866 867 #ifdef HAVE_GSSAPI 868 if (AUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB) { 869 if (iph1->gi_i != NULL && iph1->gi_r != NULL) { 870 bp = (sw == GENERATE ? iph1->gi_i : iph1->gi_r); 871 len += bp->l; 872 } 873 if (sw == GENERATE) 874 gssapi_get_itokens(iph1, &gsstokens); 875 else 876 gssapi_get_rtokens(iph1, &gsstokens); 877 if (gsstokens == NULL) 878 return NULL; 879 len += gsstokens->l; 880 } 881 #endif 882 883 buf = vmalloc(len); 884 if (buf == NULL) { 885 plog(LLV_ERROR, LOCATION, NULL, 886 "failed to get hash buffer\n"); 887 goto end; 888 } 889 890 p = buf->v; 891 892 bp = (sw == GENERATE ? iph1->dhpub : iph1->dhpub_p); 893 memcpy(p, bp->v, bp->l); 894 p += bp->l; 895 896 bp = (sw == GENERATE ? iph1->dhpub_p : iph1->dhpub); 897 memcpy(p, bp->v, bp->l); 898 p += bp->l; 899 900 if (iph1->side == INITIATOR) 901 bp2 = (sw == GENERATE ? 902 (char *)&iph1->index.i_ck : (char *)&iph1->index.r_ck); 903 else 904 bp2 = (sw == GENERATE ? 905 (char *)&iph1->index.r_ck : (char *)&iph1->index.i_ck); 906 bl = sizeof(cookie_t); 907 memcpy(p, bp2, bl); 908 p += bl; 909 910 if (iph1->side == INITIATOR) 911 bp2 = (sw == GENERATE ? 912 (char *)&iph1->index.r_ck : (char *)&iph1->index.i_ck); 913 else 914 bp2 = (sw == GENERATE ? 915 (char *)&iph1->index.i_ck : (char *)&iph1->index.r_ck); 916 bl = sizeof(cookie_t); 917 memcpy(p, bp2, bl); 918 p += bl; 919 920 bp = iph1->sa; 921 memcpy(p, bp->v, bp->l); 922 p += bp->l; 923 924 bp = (sw == GENERATE ? iph1->id : iph1->id_p); 925 memcpy(p, bp->v, bp->l); 926 p += bp->l; 927 928 #ifdef HAVE_GSSAPI 929 if (AUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB) { 930 if (iph1->gi_i != NULL && iph1->gi_r != NULL) { 931 bp = (sw == GENERATE ? iph1->gi_i : iph1->gi_r); 932 memcpy(p, bp->v, bp->l); 933 p += bp->l; 934 } 935 memcpy(p, gsstokens->v, gsstokens->l); 936 p += gsstokens->l; 937 } 938 #endif 939 940 plog(LLV_DEBUG, LOCATION, NULL, "HASH with:\n"); 941 plogdump(LLV_DEBUG, buf->v, buf->l); 942 943 /* compute HASH */ 944 res = oakley_prf(iph1->skeyid, buf, iph1); 945 if (res == NULL) 946 goto end; 947 948 error = 0; 949 950 plog(LLV_DEBUG, LOCATION, NULL, "HASH (%s) computed:\n", 951 iph1->side == INITIATOR ? "init" : "resp"); 952 plogdump(LLV_DEBUG, res->v, res->l); 953 954 end: 955 if (buf != NULL) 956 vfree(buf); 957 #ifdef HAVE_GSSAPI 958 if (gsstokens != NULL) 959 vfree(gsstokens); 960 #endif 961 return res; 962 } 963 964 /* 965 * compute HASH_I on base mode. 966 * base:psk,rsa 967 * HASH_I = prf(SKEYID, g^xi | CKY-I | CKY-R | SAi_b | IDii_b) 968 * base:sig 969 * HASH_I = prf(hash(Ni_b | Nr_b), g^xi | CKY-I | CKY-R | SAi_b | IDii_b) 970 */ 971 vchar_t * 972 oakley_ph1hash_base_i(iph1, sw) 973 struct ph1handle *iph1; 974 int sw; 975 { 976 vchar_t *buf = NULL, *res = NULL, *bp; 977 vchar_t *hashkey = NULL; 978 vchar_t *hash = NULL; /* for signature mode */ 979 char *p; 980 int len; 981 int error = -1; 982 983 /* sanity check */ 984 if (iph1->etype != ISAKMP_ETYPE_BASE) { 985 plog(LLV_ERROR, LOCATION, NULL, 986 "invalid etype for this hash function\n"); 987 return NULL; 988 } 989 990 switch (AUTHMETHOD(iph1)) { 991 case OAKLEY_ATTR_AUTH_METHOD_PSKEY: 992 case OAKLEY_ATTR_AUTH_METHOD_RSAENC: 993 case OAKLEY_ATTR_AUTH_METHOD_RSAREV: 994 #ifdef ENABLE_HYBRID 995 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I: 996 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R: 997 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I: 998 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R: 999 case FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I: 1000 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R: 1001 #endif 1002 if (iph1->skeyid == NULL) { 1003 plog(LLV_ERROR, LOCATION, NULL, "no SKEYID found.\n"); 1004 return NULL; 1005 } 1006 hashkey = iph1->skeyid; 1007 break; 1008 1009 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG: 1010 case OAKLEY_ATTR_AUTH_METHOD_RSASIG: 1011 #ifdef HAVE_GSSAPI 1012 case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB: 1013 #endif 1014 #ifdef ENABLE_HYBRID 1015 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I: 1016 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R: 1017 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I: 1018 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R: 1019 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I: 1020 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R: 1021 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I: 1022 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R: 1023 #endif 1024 /* make hash for seed */ 1025 len = iph1->nonce->l + iph1->nonce_p->l; 1026 buf = vmalloc(len); 1027 if (buf == NULL) { 1028 plog(LLV_ERROR, LOCATION, NULL, 1029 "failed to get hash buffer\n"); 1030 goto end; 1031 } 1032 p = buf->v; 1033 1034 bp = (sw == GENERATE ? iph1->nonce_p : iph1->nonce); 1035 memcpy(p, bp->v, bp->l); 1036 p += bp->l; 1037 1038 bp = (sw == GENERATE ? iph1->nonce : iph1->nonce_p); 1039 memcpy(p, bp->v, bp->l); 1040 p += bp->l; 1041 1042 hash = oakley_hash(buf, iph1); 1043 if (hash == NULL) 1044 goto end; 1045 vfree(buf); 1046 buf = NULL; 1047 1048 hashkey = hash; 1049 break; 1050 1051 default: 1052 plog(LLV_ERROR, LOCATION, NULL, 1053 "not supported authentication method %d\n", 1054 iph1->approval->authmethod); 1055 return NULL; 1056 1057 } 1058 1059 len = (sw == GENERATE ? iph1->dhpub->l : iph1->dhpub_p->l) 1060 + sizeof(cookie_t) * 2 1061 + iph1->sa->l 1062 + (sw == GENERATE ? iph1->id->l : iph1->id_p->l); 1063 buf = vmalloc(len); 1064 if (buf == NULL) { 1065 plog(LLV_ERROR, LOCATION, NULL, 1066 "failed to get hash buffer\n"); 1067 goto end; 1068 } 1069 p = buf->v; 1070 1071 bp = (sw == GENERATE ? iph1->dhpub : iph1->dhpub_p); 1072 memcpy(p, bp->v, bp->l); 1073 p += bp->l; 1074 1075 memcpy(p, &iph1->index.i_ck, sizeof(cookie_t)); 1076 p += sizeof(cookie_t); 1077 memcpy(p, &iph1->index.r_ck, sizeof(cookie_t)); 1078 p += sizeof(cookie_t); 1079 1080 memcpy(p, iph1->sa->v, iph1->sa->l); 1081 p += iph1->sa->l; 1082 1083 bp = (sw == GENERATE ? iph1->id : iph1->id_p); 1084 memcpy(p, bp->v, bp->l); 1085 p += bp->l; 1086 1087 plog(LLV_DEBUG, LOCATION, NULL, "HASH_I with:\n"); 1088 plogdump(LLV_DEBUG, buf->v, buf->l); 1089 1090 /* compute HASH */ 1091 res = oakley_prf(hashkey, buf, iph1); 1092 if (res == NULL) 1093 goto end; 1094 1095 error = 0; 1096 1097 plog(LLV_DEBUG, LOCATION, NULL, "HASH_I computed:\n"); 1098 plogdump(LLV_DEBUG, res->v, res->l); 1099 1100 end: 1101 if (hash != NULL) 1102 vfree(hash); 1103 if (buf != NULL) 1104 vfree(buf); 1105 return res; 1106 } 1107 1108 /* 1109 * compute HASH_R on base mode for signature method. 1110 * base: 1111 * HASH_R = prf(hash(Ni_b | Nr_b), g^xi | g^xr | CKY-I | CKY-R | SAi_b | IDii_b) 1112 */ 1113 vchar_t * 1114 oakley_ph1hash_base_r(iph1, sw) 1115 struct ph1handle *iph1; 1116 int sw; 1117 { 1118 vchar_t *buf = NULL, *res = NULL, *bp; 1119 vchar_t *hash = NULL; 1120 char *p; 1121 int len; 1122 int error = -1; 1123 1124 /* sanity check */ 1125 if (iph1->etype != ISAKMP_ETYPE_BASE) { 1126 plog(LLV_ERROR, LOCATION, NULL, 1127 "invalid etype for this hash function\n"); 1128 return NULL; 1129 } 1130 1131 switch(AUTHMETHOD(iph1)) { 1132 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG: 1133 case OAKLEY_ATTR_AUTH_METHOD_RSASIG: 1134 #ifdef ENABLE_HYBRID 1135 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I: 1136 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R: 1137 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I: 1138 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R: 1139 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I: 1140 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R: 1141 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I: 1142 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R: 1143 case FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I: 1144 #endif 1145 break; 1146 default: 1147 plog(LLV_ERROR, LOCATION, NULL, 1148 "not supported authentication method %d\n", 1149 iph1->approval->authmethod); 1150 return NULL; 1151 break; 1152 } 1153 1154 /* make hash for seed */ 1155 len = iph1->nonce->l + iph1->nonce_p->l; 1156 buf = vmalloc(len); 1157 if (buf == NULL) { 1158 plog(LLV_ERROR, LOCATION, NULL, 1159 "failed to get hash buffer\n"); 1160 goto end; 1161 } 1162 p = buf->v; 1163 1164 bp = (sw == GENERATE ? iph1->nonce_p : iph1->nonce); 1165 memcpy(p, bp->v, bp->l); 1166 p += bp->l; 1167 1168 bp = (sw == GENERATE ? iph1->nonce : iph1->nonce_p); 1169 memcpy(p, bp->v, bp->l); 1170 p += bp->l; 1171 1172 hash = oakley_hash(buf, iph1); 1173 if (hash == NULL) 1174 goto end; 1175 vfree(buf); 1176 buf = NULL; 1177 1178 /* make really hash */ 1179 len = (sw == GENERATE ? iph1->dhpub_p->l : iph1->dhpub->l) 1180 + (sw == GENERATE ? iph1->dhpub->l : iph1->dhpub_p->l) 1181 + sizeof(cookie_t) * 2 1182 + iph1->sa->l 1183 + (sw == GENERATE ? iph1->id_p->l : iph1->id->l); 1184 buf = vmalloc(len); 1185 if (buf == NULL) { 1186 plog(LLV_ERROR, LOCATION, NULL, 1187 "failed to get hash buffer\n"); 1188 goto end; 1189 } 1190 p = buf->v; 1191 1192 1193 bp = (sw == GENERATE ? iph1->dhpub_p : iph1->dhpub); 1194 memcpy(p, bp->v, bp->l); 1195 p += bp->l; 1196 1197 bp = (sw == GENERATE ? iph1->dhpub : iph1->dhpub_p); 1198 memcpy(p, bp->v, bp->l); 1199 p += bp->l; 1200 1201 memcpy(p, &iph1->index.i_ck, sizeof(cookie_t)); 1202 p += sizeof(cookie_t); 1203 memcpy(p, &iph1->index.r_ck, sizeof(cookie_t)); 1204 p += sizeof(cookie_t); 1205 1206 memcpy(p, iph1->sa->v, iph1->sa->l); 1207 p += iph1->sa->l; 1208 1209 bp = (sw == GENERATE ? iph1->id_p : iph1->id); 1210 memcpy(p, bp->v, bp->l); 1211 p += bp->l; 1212 1213 plog(LLV_DEBUG, LOCATION, NULL, "HASH_R with:\n"); 1214 plogdump(LLV_DEBUG, buf->v, buf->l); 1215 1216 /* compute HASH */ 1217 res = oakley_prf(hash, buf, iph1); 1218 if (res == NULL) 1219 goto end; 1220 1221 error = 0; 1222 1223 plog(LLV_DEBUG, LOCATION, NULL, "HASH_R computed:\n"); 1224 plogdump(LLV_DEBUG, res->v, res->l); 1225 1226 end: 1227 if (buf != NULL) 1228 vfree(buf); 1229 if (hash) 1230 vfree(hash); 1231 return res; 1232 } 1233 1234 /* 1235 * compute each authentication method in phase 1. 1236 * OUT: 1237 * 0: OK 1238 * -1: error 1239 * other: error to be reply with notification. 1240 * the value is notification type. 1241 */ 1242 int 1243 oakley_validate_auth(iph1) 1244 struct ph1handle *iph1; 1245 { 1246 vchar_t *my_hash = NULL; 1247 int result; 1248 #ifdef HAVE_GSSAPI 1249 vchar_t *gsshash = NULL; 1250 #endif 1251 #ifdef ENABLE_STATS 1252 struct timeval start, end; 1253 #endif 1254 1255 #ifdef ENABLE_STATS 1256 gettimeofday(&start, NULL); 1257 #endif 1258 1259 switch (AUTHMETHOD(iph1)) { 1260 case OAKLEY_ATTR_AUTH_METHOD_PSKEY: 1261 #ifdef ENABLE_HYBRID 1262 case FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I: 1263 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R: 1264 #endif 1265 /* validate HASH */ 1266 { 1267 char *r_hash; 1268 1269 if (iph1->id_p == NULL || iph1->pl_hash == NULL) { 1270 plog(LLV_ERROR, LOCATION, iph1->remote, 1271 "few isakmp message received.\n"); 1272 return ISAKMP_NTYPE_PAYLOAD_MALFORMED; 1273 } 1274 #ifdef ENABLE_HYBRID 1275 if (AUTHMETHOD(iph1) == FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I && 1276 ((iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_XAUTH) == 0)) 1277 { 1278 plog(LLV_ERROR, LOCATION, NULL, "No SIG was passed, " 1279 "hybrid auth is enabled, " 1280 "but peer is no Xauth compliant\n"); 1281 return ISAKMP_NTYPE_SITUATION_NOT_SUPPORTED; 1282 break; 1283 } 1284 #endif 1285 r_hash = (caddr_t)(iph1->pl_hash + 1); 1286 1287 plog(LLV_DEBUG, LOCATION, NULL, "HASH received:\n"); 1288 plogdump(LLV_DEBUG, r_hash, 1289 ntohs(iph1->pl_hash->h.len) - sizeof(*iph1->pl_hash)); 1290 1291 switch (iph1->etype) { 1292 case ISAKMP_ETYPE_IDENT: 1293 case ISAKMP_ETYPE_AGG: 1294 my_hash = oakley_ph1hash_common(iph1, VALIDATE); 1295 break; 1296 case ISAKMP_ETYPE_BASE: 1297 if (iph1->side == INITIATOR) 1298 my_hash = oakley_ph1hash_common(iph1, VALIDATE); 1299 else 1300 my_hash = oakley_ph1hash_base_i(iph1, VALIDATE); 1301 break; 1302 default: 1303 plog(LLV_ERROR, LOCATION, NULL, 1304 "invalid etype %d\n", iph1->etype); 1305 return ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE; 1306 } 1307 if (my_hash == NULL) 1308 return ISAKMP_INTERNAL_ERROR; 1309 1310 result = memcmp(my_hash->v, r_hash, my_hash->l); 1311 vfree(my_hash); 1312 1313 if (result) { 1314 plog(LLV_ERROR, LOCATION, NULL, "HASH mismatched\n"); 1315 return ISAKMP_NTYPE_INVALID_HASH_INFORMATION; 1316 } 1317 1318 plog(LLV_DEBUG, LOCATION, NULL, "HASH for PSK validated.\n"); 1319 } 1320 break; 1321 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG: 1322 case OAKLEY_ATTR_AUTH_METHOD_RSASIG: 1323 #ifdef ENABLE_HYBRID 1324 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I: 1325 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I: 1326 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I: 1327 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R: 1328 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I: 1329 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R: 1330 #endif 1331 { 1332 int error = 0; 1333 int certtype = 0; 1334 1335 /* validation */ 1336 if (iph1->id_p == NULL) { 1337 plog(LLV_ERROR, LOCATION, iph1->remote, 1338 "no ID payload was passed.\n"); 1339 return ISAKMP_NTYPE_PAYLOAD_MALFORMED; 1340 } 1341 if (iph1->sig_p == NULL) { 1342 plog(LLV_ERROR, LOCATION, iph1->remote, 1343 "no SIG payload was passed.\n"); 1344 return ISAKMP_NTYPE_PAYLOAD_MALFORMED; 1345 } 1346 1347 plog(LLV_DEBUG, LOCATION, NULL, "SIGN passed:\n"); 1348 plogdump(LLV_DEBUG, iph1->sig_p->v, iph1->sig_p->l); 1349 1350 /* get peer's cert */ 1351 switch (iph1->rmconf->getcert_method) { 1352 case ISAKMP_GETCERT_PAYLOAD: 1353 if (iph1->cert_p == NULL) { 1354 plog(LLV_ERROR, LOCATION, NULL, 1355 "no peer's CERT payload found.\n"); 1356 return ISAKMP_INTERNAL_ERROR; 1357 } 1358 break; 1359 case ISAKMP_GETCERT_LOCALFILE: 1360 switch (iph1->rmconf->certtype) { 1361 case ISAKMP_CERT_X509SIGN: 1362 if (iph1->rmconf->peerscertfile == NULL) { 1363 plog(LLV_ERROR, LOCATION, NULL, 1364 "no peer's CERT file found.\n"); 1365 return ISAKMP_INTERNAL_ERROR; 1366 } 1367 1368 /* don't use cached cert */ 1369 if (iph1->cert_p != NULL) { 1370 oakley_delcert(iph1->cert_p); 1371 iph1->cert_p = NULL; 1372 } 1373 1374 error = get_cert_fromlocal(iph1, 0); 1375 #ifdef ANDROID_PATCHED 1376 if (!error) 1377 break; 1378 default: 1379 return ISAKMP_INTERNAL_ERROR; 1380 #else 1381 break; 1382 1383 case ISAKMP_CERT_PLAINRSA: 1384 error = get_plainrsa_fromlocal(iph1, 0); 1385 break; 1386 } 1387 if (error) 1388 return ISAKMP_INTERNAL_ERROR; 1389 break; 1390 case ISAKMP_GETCERT_DNS: 1391 if (iph1->rmconf->peerscertfile != NULL) { 1392 plog(LLV_ERROR, LOCATION, NULL, 1393 "why peer's CERT file is defined " 1394 "though getcert method is dns ?\n"); 1395 return ISAKMP_INTERNAL_ERROR; 1396 } 1397 1398 /* don't use cached cert */ 1399 if (iph1->cert_p != NULL) { 1400 oakley_delcert(iph1->cert_p); 1401 iph1->cert_p = NULL; 1402 } 1403 1404 iph1->cert_p = dnssec_getcert(iph1->id_p); 1405 if (iph1->cert_p == NULL) { 1406 plog(LLV_ERROR, LOCATION, NULL, 1407 "no CERT RR found.\n"); 1408 return ISAKMP_INTERNAL_ERROR; 1409 #endif 1410 } 1411 break; 1412 default: 1413 plog(LLV_ERROR, LOCATION, NULL, 1414 "invalid getcert_mothod: %d\n", 1415 iph1->rmconf->getcert_method); 1416 return ISAKMP_INTERNAL_ERROR; 1417 } 1418 1419 /* compare ID payload and certificate name */ 1420 if (iph1->rmconf->verify_cert && 1421 (error = oakley_check_certid(iph1)) != 0) 1422 return error; 1423 1424 /* verify certificate */ 1425 if (iph1->rmconf->verify_cert 1426 && iph1->rmconf->getcert_method == ISAKMP_GETCERT_PAYLOAD) { 1427 certtype = iph1->rmconf->certtype; 1428 #ifdef ENABLE_HYBRID 1429 switch (AUTHMETHOD(iph1)) { 1430 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I: 1431 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I: 1432 certtype = iph1->cert_p->type; 1433 break; 1434 default: 1435 break; 1436 } 1437 #endif 1438 switch (certtype) { 1439 case ISAKMP_CERT_X509SIGN: { 1440 char path[MAXPATHLEN]; 1441 char *ca; 1442 1443 if (iph1->rmconf->cacertfile != NULL) { 1444 getpathname(path, sizeof(path), 1445 LC_PATHTYPE_CERT, 1446 iph1->rmconf->cacertfile); 1447 ca = path; 1448 } else { 1449 ca = NULL; 1450 } 1451 1452 error = eay_check_x509cert(&iph1->cert_p->cert, 1453 lcconf->pathinfo[LC_PATHTYPE_CERT], 1454 ca, 0); 1455 break; 1456 } 1457 1458 default: 1459 plog(LLV_ERROR, LOCATION, NULL, 1460 "no supported certtype %d\n", certtype); 1461 return ISAKMP_INTERNAL_ERROR; 1462 } 1463 if (error != 0) { 1464 plog(LLV_ERROR, LOCATION, NULL, 1465 "the peer's certificate is not verified.\n"); 1466 return ISAKMP_NTYPE_INVALID_CERT_AUTHORITY; 1467 } 1468 } 1469 1470 /* Generate a warning if verify_cert == 0 1471 */ 1472 if (iph1->rmconf->verify_cert){ 1473 plog(LLV_DEBUG, LOCATION, NULL, "CERT validated\n"); 1474 }else{ 1475 plog(LLV_WARNING, LOCATION, NULL, 1476 "CERT validation disabled by configuration\n"); 1477 } 1478 1479 /* compute hash */ 1480 switch (iph1->etype) { 1481 case ISAKMP_ETYPE_IDENT: 1482 case ISAKMP_ETYPE_AGG: 1483 my_hash = oakley_ph1hash_common(iph1, VALIDATE); 1484 break; 1485 case ISAKMP_ETYPE_BASE: 1486 if (iph1->side == INITIATOR) 1487 my_hash = oakley_ph1hash_base_r(iph1, VALIDATE); 1488 else 1489 my_hash = oakley_ph1hash_base_i(iph1, VALIDATE); 1490 break; 1491 default: 1492 plog(LLV_ERROR, LOCATION, NULL, 1493 "invalid etype %d\n", iph1->etype); 1494 return ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE; 1495 } 1496 if (my_hash == NULL) 1497 return ISAKMP_INTERNAL_ERROR; 1498 1499 1500 certtype = iph1->rmconf->certtype; 1501 #ifdef ENABLE_HYBRID 1502 switch (AUTHMETHOD(iph1)) { 1503 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I: 1504 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I: 1505 certtype = iph1->cert_p->type; 1506 break; 1507 default: 1508 break; 1509 } 1510 #endif 1511 /* check signature */ 1512 switch (certtype) { 1513 case ISAKMP_CERT_X509SIGN: 1514 case ISAKMP_CERT_DNS: 1515 error = eay_check_x509sign(my_hash, 1516 iph1->sig_p, 1517 &iph1->cert_p->cert); 1518 break; 1519 #ifndef ANDROID_PATCHED 1520 case ISAKMP_CERT_PLAINRSA: 1521 iph1->rsa_p = rsa_try_check_rsasign(my_hash, 1522 iph1->sig_p, iph1->rsa_candidates); 1523 error = iph1->rsa_p ? 0 : -1; 1524 1525 break; 1526 #endif 1527 default: 1528 plog(LLV_ERROR, LOCATION, NULL, 1529 "no supported certtype %d\n", 1530 certtype); 1531 vfree(my_hash); 1532 return ISAKMP_INTERNAL_ERROR; 1533 } 1534 1535 vfree(my_hash); 1536 if (error != 0) { 1537 plog(LLV_ERROR, LOCATION, NULL, 1538 "Invalid SIG.\n"); 1539 return ISAKMP_NTYPE_INVALID_SIGNATURE; 1540 } 1541 plog(LLV_DEBUG, LOCATION, NULL, "SIG authenticated\n"); 1542 } 1543 break; 1544 #ifdef ENABLE_HYBRID 1545 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R: 1546 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R: 1547 { 1548 if ((iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_XAUTH) == 0) { 1549 plog(LLV_ERROR, LOCATION, NULL, "No SIG was passed, " 1550 "hybrid auth is enabled, " 1551 "but peer is no Xauth compliant\n"); 1552 return ISAKMP_NTYPE_SITUATION_NOT_SUPPORTED; 1553 break; 1554 } 1555 plog(LLV_INFO, LOCATION, NULL, "No SIG was passed, " 1556 "but hybrid auth is enabled\n"); 1557 1558 return 0; 1559 break; 1560 } 1561 #endif 1562 #ifdef HAVE_GSSAPI 1563 case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB: 1564 /* check if we're not into XAUTH_PSKEY_I instead */ 1565 #ifdef ENABLE_HYBRID 1566 if (iph1->rmconf->xauth) 1567 break; 1568 #endif 1569 switch (iph1->etype) { 1570 case ISAKMP_ETYPE_IDENT: 1571 case ISAKMP_ETYPE_AGG: 1572 my_hash = oakley_ph1hash_common(iph1, VALIDATE); 1573 break; 1574 default: 1575 plog(LLV_ERROR, LOCATION, NULL, 1576 "invalid etype %d\n", iph1->etype); 1577 return ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE; 1578 } 1579 1580 if (my_hash == NULL) { 1581 if (gssapi_more_tokens(iph1)) 1582 return ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE; 1583 else 1584 return ISAKMP_NTYPE_INVALID_HASH_INFORMATION; 1585 } 1586 1587 gsshash = gssapi_unwraphash(iph1); 1588 if (gsshash == NULL) { 1589 vfree(my_hash); 1590 return ISAKMP_NTYPE_INVALID_HASH_INFORMATION; 1591 } 1592 1593 result = memcmp(my_hash->v, gsshash->v, my_hash->l); 1594 vfree(my_hash); 1595 vfree(gsshash); 1596 1597 if (result) { 1598 plog(LLV_ERROR, LOCATION, NULL, "HASH mismatched\n"); 1599 return ISAKMP_NTYPE_INVALID_HASH_INFORMATION; 1600 } 1601 plog(LLV_DEBUG, LOCATION, NULL, "hash compared OK\n"); 1602 break; 1603 #endif 1604 case OAKLEY_ATTR_AUTH_METHOD_RSAENC: 1605 case OAKLEY_ATTR_AUTH_METHOD_RSAREV: 1606 #ifdef ENABLE_HYBRID 1607 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I: 1608 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R: 1609 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I: 1610 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R: 1611 #endif 1612 if (iph1->id_p == NULL || iph1->pl_hash == NULL) { 1613 plog(LLV_ERROR, LOCATION, iph1->remote, 1614 "few isakmp message received.\n"); 1615 return ISAKMP_NTYPE_PAYLOAD_MALFORMED; 1616 } 1617 plog(LLV_ERROR, LOCATION, iph1->remote, 1618 "not supported authmethod type %s\n", 1619 s_oakley_attr_method(iph1->approval->authmethod)); 1620 return ISAKMP_INTERNAL_ERROR; 1621 default: 1622 plog(LLV_ERROR, LOCATION, iph1->remote, 1623 "invalid authmethod %d why ?\n", 1624 iph1->approval->authmethod); 1625 return ISAKMP_INTERNAL_ERROR; 1626 } 1627 #ifdef ENABLE_STATS 1628 gettimeofday(&end, NULL); 1629 syslog(LOG_NOTICE, "%s(%s): %8.6f", __func__, 1630 s_oakley_attr_method(iph1->approval->authmethod), 1631 timedelta(&start, &end)); 1632 #endif 1633 1634 return 0; 1635 } 1636 1637 /* get my certificate 1638 * NOTE: include certificate type. 1639 */ 1640 int 1641 oakley_getmycert(iph1) 1642 struct ph1handle *iph1; 1643 { 1644 switch (iph1->rmconf->certtype) { 1645 case ISAKMP_CERT_X509SIGN: 1646 if (iph1->cert) 1647 return 0; 1648 return get_cert_fromlocal(iph1, 1); 1649 1650 #ifndef ANDROID_PATCHED 1651 case ISAKMP_CERT_PLAINRSA: 1652 if (iph1->rsa) 1653 return 0; 1654 return get_plainrsa_fromlocal(iph1, 1); 1655 #endif 1656 1657 default: 1658 plog(LLV_ERROR, LOCATION, NULL, 1659 "Unknown certtype #%d\n", 1660 iph1->rmconf->certtype); 1661 return -1; 1662 } 1663 1664 } 1665 1666 /* 1667 * get a CERT from local file. 1668 * IN: 1669 * my != 0 my cert. 1670 * my == 0 peer's cert. 1671 */ 1672 static int 1673 get_cert_fromlocal(iph1, my) 1674 struct ph1handle *iph1; 1675 int my; 1676 { 1677 char path[MAXPATHLEN]; 1678 vchar_t *cert = NULL; 1679 cert_t **certpl; 1680 char *certfile; 1681 int error = -1; 1682 1683 if (my) { 1684 certfile = iph1->rmconf->mycertfile; 1685 certpl = &iph1->cert; 1686 } else { 1687 certfile = iph1->rmconf->peerscertfile; 1688 certpl = &iph1->cert_p; 1689 } 1690 if (!certfile) { 1691 plog(LLV_ERROR, LOCATION, NULL, "no CERT defined.\n"); 1692 return 0; 1693 } 1694 1695 switch (iph1->rmconf->certtype) { 1696 case ISAKMP_CERT_X509SIGN: 1697 case ISAKMP_CERT_DNS: 1698 /* make public file name */ 1699 getpathname(path, sizeof(path), LC_PATHTYPE_CERT, certfile); 1700 cert = eay_get_x509cert(path); 1701 if (cert) { 1702 char *p = NULL; 1703 p = eay_get_x509text(cert); 1704 plog(LLV_DEBUG, LOCATION, NULL, "%s", p ? p : "\n"); 1705 racoon_free(p); 1706 }; 1707 break; 1708 1709 default: 1710 plog(LLV_ERROR, LOCATION, NULL, 1711 "not supported certtype %d\n", 1712 iph1->rmconf->certtype); 1713 goto end; 1714 } 1715 1716 if (!cert) { 1717 plog(LLV_ERROR, LOCATION, NULL, 1718 "failed to get %s CERT.\n", 1719 my ? "my" : "peers"); 1720 goto end; 1721 } 1722 1723 *certpl = oakley_newcert(); 1724 if (!*certpl) { 1725 plog(LLV_ERROR, LOCATION, NULL, 1726 "failed to get cert buffer.\n"); 1727 goto end; 1728 } 1729 (*certpl)->pl = vmalloc(cert->l + 1); 1730 if ((*certpl)->pl == NULL) { 1731 plog(LLV_ERROR, LOCATION, NULL, 1732 "failed to get cert buffer\n"); 1733 oakley_delcert(*certpl); 1734 *certpl = NULL; 1735 goto end; 1736 } 1737 memcpy((*certpl)->pl->v + 1, cert->v, cert->l); 1738 (*certpl)->pl->v[0] = iph1->rmconf->certtype; 1739 (*certpl)->type = iph1->rmconf->certtype; 1740 (*certpl)->cert.v = (*certpl)->pl->v + 1; 1741 (*certpl)->cert.l = (*certpl)->pl->l - 1; 1742 1743 plog(LLV_DEBUG, LOCATION, NULL, "created CERT payload:\n"); 1744 plogdump(LLV_DEBUG, (*certpl)->pl->v, (*certpl)->pl->l); 1745 1746 error = 0; 1747 1748 end: 1749 if (cert != NULL) 1750 vfree(cert); 1751 1752 return error; 1753 } 1754 1755 #ifndef ANDROID_PATCHED 1756 static int 1757 get_plainrsa_fromlocal(iph1, my) 1758 struct ph1handle *iph1; 1759 int my; 1760 { 1761 char path[MAXPATHLEN]; 1762 vchar_t *cert = NULL; 1763 char *certfile; 1764 int error = -1; 1765 1766 iph1->rsa_candidates = rsa_lookup_keys(iph1, my); 1767 if (!iph1->rsa_candidates || 1768 rsa_list_count(iph1->rsa_candidates) == 0) { 1769 plog(LLV_ERROR, LOCATION, NULL, 1770 "%s RSA key not found for %s\n", 1771 my ? "Private" : "Public", 1772 saddr2str_fromto("%s <-> %s", 1773 iph1->local, iph1->remote)); 1774 goto end; 1775 } 1776 1777 if (my && rsa_list_count(iph1->rsa_candidates) > 1) { 1778 plog(LLV_WARNING, LOCATION, NULL, 1779 "More than one (=%lu) private " 1780 "PlainRSA key found for %s\n", 1781 rsa_list_count(iph1->rsa_candidates), 1782 saddr2str_fromto("%s <-> %s", 1783 iph1->local, iph1->remote)); 1784 plog(LLV_WARNING, LOCATION, NULL, 1785 "This may have unpredictable results, " 1786 "i.e. wrong key could be used!\n"); 1787 plog(LLV_WARNING, LOCATION, NULL, 1788 "Consider using only one single private " 1789 "key for all peers...\n"); 1790 } 1791 if (my) { 1792 iph1->rsa = ((struct rsa_key *) 1793 genlist_next(iph1->rsa_candidates, NULL))->rsa; 1794 1795 genlist_free(iph1->rsa_candidates, NULL); 1796 iph1->rsa_candidates = NULL; 1797 1798 if (iph1->rsa == NULL) 1799 goto end; 1800 } 1801 1802 error = 0; 1803 1804 end: 1805 return error; 1806 } 1807 #endif 1808 1809 #ifdef ANDROID_CHANGES 1810 1811 #if defined(OPENSSL_IS_BORINGSSL) 1812 /* EVP_PKEY_from_keystore is from system/security/keystore-engine. */ 1813 extern EVP_PKEY* EVP_PKEY_from_keystore(const char *key_id); 1814 #endif 1815 1816 static vchar_t* keystore_sign(vchar_t* src, const char* path) { 1817 vchar_t* sig = NULL; 1818 EVP_PKEY *evp = NULL; 1819 1820 #if !defined(OPENSSL_IS_BORINGSSL) 1821 ENGINE *engine = ENGINE_by_id("keystore"); 1822 if (!engine) { 1823 return NULL; 1824 } 1825 if (!ENGINE_init(engine)) { 1826 ENGINE_free(engine); 1827 return NULL; 1828 } 1829 #endif 1830 1831 const char *key_id; 1832 if (sscanf(path, pname, &key_id) != 1) { 1833 do_plog(LLV_ERROR, "couldn't read private key info\n"); 1834 goto out; 1835 } 1836 1837 #if !defined(OPENSSL_IS_BORINGSSL) 1838 evp = ENGINE_load_private_key(engine, key_id, NULL, NULL); 1839 #else 1840 evp = EVP_PKEY_from_keystore(key_id); 1841 #endif 1842 if (!evp) { 1843 do_plog(LLV_ERROR, "couldn't retrieve private key"); 1844 ERR_remove_thread_state(NULL); 1845 goto out; 1846 } 1847 1848 if (EVP_PKEY_id(evp) == EVP_PKEY_RSA) { 1849 sig = eay_rsa_sign(src, evp->pkey.rsa); 1850 } 1851 1852 out: 1853 if (evp) { 1854 EVP_PKEY_free(evp); 1855 } 1856 1857 #if !defined(OPENSSL_IS_BORINGSSL) 1858 ENGINE_finish(engine); 1859 ENGINE_free(engine); 1860 #endif 1861 1862 return sig; 1863 } 1864 #endif 1865 1866 /* get signature */ 1867 int 1868 oakley_getsign(iph1) 1869 struct ph1handle *iph1; 1870 { 1871 char path[MAXPATHLEN]; 1872 vchar_t *privkey = NULL; 1873 int error = -1; 1874 1875 switch (iph1->rmconf->certtype) { 1876 case ISAKMP_CERT_X509SIGN: 1877 case ISAKMP_CERT_DNS: 1878 if (iph1->rmconf->myprivfile == NULL) { 1879 plog(LLV_ERROR, LOCATION, NULL, "no cert defined.\n"); 1880 goto end; 1881 } 1882 1883 /* make private file name */ 1884 getpathname(path, sizeof(path), 1885 LC_PATHTYPE_CERT, 1886 iph1->rmconf->myprivfile); 1887 #ifdef ANDROID_CHANGES 1888 iph1->sig = keystore_sign(iph1->hash, path); 1889 #else 1890 privkey = privsep_eay_get_pkcs1privkey(path); 1891 if (privkey == NULL) { 1892 plog(LLV_ERROR, LOCATION, NULL, 1893 "failed to get private key.\n"); 1894 goto end; 1895 } 1896 plog(LLV_DEBUG2, LOCATION, NULL, "private key:\n"); 1897 plogdump(LLV_DEBUG2, privkey->v, privkey->l); 1898 1899 iph1->sig = eay_get_x509sign(iph1->hash, privkey); 1900 #endif 1901 break; 1902 #ifndef ANDROID_PATCHED 1903 case ISAKMP_CERT_PLAINRSA: 1904 iph1->sig = eay_get_rsasign(iph1->hash, iph1->rsa); 1905 break; 1906 #endif 1907 default: 1908 plog(LLV_ERROR, LOCATION, NULL, 1909 "Unknown certtype #%d\n", 1910 iph1->rmconf->certtype); 1911 goto end; 1912 } 1913 1914 if (iph1->sig == NULL) { 1915 plog(LLV_ERROR, LOCATION, NULL, "failed to sign.\n"); 1916 goto end; 1917 } 1918 1919 plog(LLV_DEBUG, LOCATION, NULL, "SIGN computed:\n"); 1920 plogdump(LLV_DEBUG, iph1->sig->v, iph1->sig->l); 1921 1922 error = 0; 1923 1924 end: 1925 if (privkey != NULL) 1926 vfree(privkey); 1927 1928 return error; 1929 } 1930 1931 /* 1932 * compare certificate name and ID value. 1933 */ 1934 static int 1935 oakley_check_certid(iph1) 1936 struct ph1handle *iph1; 1937 { 1938 struct ipsecdoi_id_b *id_b; 1939 vchar_t *name = NULL; 1940 char *altname = NULL; 1941 int idlen, type; 1942 int error; 1943 1944 if (iph1->id_p == NULL || iph1->cert_p == NULL) { 1945 plog(LLV_ERROR, LOCATION, NULL, "no ID nor CERT found.\n"); 1946 return ISAKMP_NTYPE_INVALID_ID_INFORMATION; 1947 } 1948 1949 id_b = (struct ipsecdoi_id_b *)iph1->id_p->v; 1950 idlen = iph1->id_p->l - sizeof(*id_b); 1951 1952 switch (id_b->type) { 1953 case IPSECDOI_ID_DER_ASN1_DN: 1954 name = eay_get_x509asn1subjectname(&iph1->cert_p->cert); 1955 if (!name) { 1956 plog(LLV_ERROR, LOCATION, NULL, 1957 "failed to get subjectName\n"); 1958 return ISAKMP_NTYPE_INVALID_CERTIFICATE; 1959 } 1960 if (idlen != name->l) { 1961 plog(LLV_ERROR, LOCATION, NULL, 1962 "Invalid ID length in phase 1.\n"); 1963 vfree(name); 1964 return ISAKMP_NTYPE_INVALID_ID_INFORMATION; 1965 } 1966 error = memcmp(id_b + 1, name->v, idlen); 1967 vfree(name); 1968 if (error != 0) { 1969 plog(LLV_ERROR, LOCATION, NULL, 1970 "ID mismatched with ASN1 SubjectName.\n"); 1971 plogdump(LLV_DEBUG, id_b + 1, idlen); 1972 plogdump(LLV_DEBUG, name->v, idlen); 1973 return ISAKMP_NTYPE_INVALID_ID_INFORMATION; 1974 } 1975 return 0; 1976 case IPSECDOI_ID_IPV4_ADDR: 1977 case IPSECDOI_ID_IPV6_ADDR: 1978 { 1979 /* 1980 * converting to binary from string because openssl return 1981 * a string even if object is a binary. 1982 * XXX fix it ! access by ASN.1 directly without. 1983 */ 1984 struct addrinfo hints, *res; 1985 caddr_t a = NULL; 1986 int pos; 1987 1988 for (pos = 1; ; pos++) { 1989 if (eay_get_x509subjectaltname(&iph1->cert_p->cert, 1990 &altname, &type, pos) !=0) { 1991 plog(LLV_ERROR, LOCATION, NULL, 1992 "failed to get subjectAltName\n"); 1993 return ISAKMP_NTYPE_INVALID_CERTIFICATE; 1994 } 1995 1996 /* it's the end condition of the loop. */ 1997 if (!altname) { 1998 plog(LLV_ERROR, LOCATION, NULL, 1999 "no proper subjectAltName.\n"); 2000 return ISAKMP_NTYPE_INVALID_CERTIFICATE; 2001 } 2002 2003 if (check_typeofcertname(id_b->type, type) == 0) 2004 break; 2005 2006 /* next name */ 2007 racoon_free(altname); 2008 altname = NULL; 2009 } 2010 memset(&hints, 0, sizeof(hints)); 2011 hints.ai_family = PF_UNSPEC; 2012 hints.ai_socktype = SOCK_RAW; 2013 hints.ai_flags = AI_NUMERICHOST; 2014 error = getaddrinfo(altname, NULL, &hints, &res); 2015 if (error != 0) { 2016 plog(LLV_ERROR, LOCATION, NULL, 2017 "no proper subjectAltName.\n"); 2018 racoon_free(altname); 2019 return ISAKMP_NTYPE_INVALID_CERTIFICATE; 2020 } 2021 switch (res->ai_family) { 2022 case AF_INET: 2023 a = (caddr_t)&((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr; 2024 break; 2025 #ifdef INET6 2026 case AF_INET6: 2027 a = (caddr_t)&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr.s6_addr; 2028 break; 2029 #endif 2030 default: 2031 plog(LLV_ERROR, LOCATION, NULL, 2032 "family not supported: %d.\n", res->ai_family); 2033 racoon_free(altname); 2034 freeaddrinfo(res); 2035 return ISAKMP_NTYPE_INVALID_CERTIFICATE; 2036 } 2037 error = memcmp(id_b + 1, a, idlen); 2038 freeaddrinfo(res); 2039 vfree(name); 2040 if (error != 0) { 2041 plog(LLV_ERROR, LOCATION, NULL, 2042 "ID mismatched with subjectAltName.\n"); 2043 plogdump(LLV_DEBUG, id_b + 1, idlen); 2044 plogdump(LLV_DEBUG, a, idlen); 2045 return ISAKMP_NTYPE_INVALID_ID_INFORMATION; 2046 } 2047 return 0; 2048 } 2049 case IPSECDOI_ID_FQDN: 2050 case IPSECDOI_ID_USER_FQDN: 2051 { 2052 int pos; 2053 2054 for (pos = 1; ; pos++) { 2055 if (eay_get_x509subjectaltname(&iph1->cert_p->cert, 2056 &altname, &type, pos) != 0){ 2057 plog(LLV_ERROR, LOCATION, NULL, 2058 "failed to get subjectAltName\n"); 2059 return ISAKMP_NTYPE_INVALID_CERTIFICATE; 2060 } 2061 2062 /* it's the end condition of the loop. */ 2063 if (!altname) { 2064 plog(LLV_ERROR, LOCATION, NULL, 2065 "no proper subjectAltName.\n"); 2066 return ISAKMP_NTYPE_INVALID_CERTIFICATE; 2067 } 2068 2069 if (check_typeofcertname(id_b->type, type) == 0) 2070 break; 2071 2072 /* next name */ 2073 racoon_free(altname); 2074 altname = NULL; 2075 } 2076 if (idlen != strlen(altname)) { 2077 plog(LLV_ERROR, LOCATION, NULL, 2078 "Invalid ID length in phase 1.\n"); 2079 racoon_free(altname); 2080 return ISAKMP_NTYPE_INVALID_ID_INFORMATION; 2081 } 2082 if (check_typeofcertname(id_b->type, type) != 0) { 2083 plog(LLV_ERROR, LOCATION, NULL, 2084 "ID type mismatched. ID: %s CERT: %s.\n", 2085 s_ipsecdoi_ident(id_b->type), 2086 s_ipsecdoi_ident(type)); 2087 racoon_free(altname); 2088 return ISAKMP_NTYPE_INVALID_ID_INFORMATION; 2089 } 2090 error = memcmp(id_b + 1, altname, idlen); 2091 if (error) { 2092 plog(LLV_ERROR, LOCATION, NULL, "ID mismatched.\n"); 2093 plogdump(LLV_DEBUG, id_b + 1, idlen); 2094 plogdump(LLV_DEBUG, altname, idlen); 2095 racoon_free(altname); 2096 return ISAKMP_NTYPE_INVALID_ID_INFORMATION; 2097 } 2098 racoon_free(altname); 2099 return 0; 2100 } 2101 default: 2102 plog(LLV_ERROR, LOCATION, NULL, 2103 "Inpropper ID type passed: %s.\n", 2104 s_ipsecdoi_ident(id_b->type)); 2105 return ISAKMP_NTYPE_INVALID_ID_INFORMATION; 2106 } 2107 /*NOTREACHED*/ 2108 } 2109 2110 static int 2111 check_typeofcertname(doi, genid) 2112 int doi, genid; 2113 { 2114 switch (doi) { 2115 case IPSECDOI_ID_IPV4_ADDR: 2116 case IPSECDOI_ID_IPV4_ADDR_SUBNET: 2117 case IPSECDOI_ID_IPV6_ADDR: 2118 case IPSECDOI_ID_IPV6_ADDR_SUBNET: 2119 case IPSECDOI_ID_IPV4_ADDR_RANGE: 2120 case IPSECDOI_ID_IPV6_ADDR_RANGE: 2121 if (genid != GENT_IPADD) 2122 return -1; 2123 return 0; 2124 case IPSECDOI_ID_FQDN: 2125 if (genid != GENT_DNS) 2126 return -1; 2127 return 0; 2128 case IPSECDOI_ID_USER_FQDN: 2129 if (genid != GENT_EMAIL) 2130 return -1; 2131 return 0; 2132 case IPSECDOI_ID_DER_ASN1_DN: /* should not be passed to this function*/ 2133 case IPSECDOI_ID_DER_ASN1_GN: 2134 case IPSECDOI_ID_KEY_ID: 2135 default: 2136 return -1; 2137 } 2138 /*NOTREACHED*/ 2139 } 2140 2141 /* 2142 * save certificate including certificate type. 2143 */ 2144 int 2145 oakley_savecert(iph1, gen) 2146 struct ph1handle *iph1; 2147 struct isakmp_gen *gen; 2148 { 2149 cert_t **c; 2150 u_int8_t type; 2151 STACK_OF(X509) *certs=NULL; 2152 #if !defined(OPENSSL_IS_BORINGSSL) 2153 PKCS7 *p7; 2154 #endif 2155 2156 type = *(u_int8_t *)(gen + 1) & 0xff; 2157 2158 switch (type) { 2159 case ISAKMP_CERT_DNS: 2160 plog(LLV_WARNING, LOCATION, NULL, 2161 "CERT payload is unnecessary in DNSSEC. " 2162 "ignore this CERT payload.\n"); 2163 return 0; 2164 case ISAKMP_CERT_PKCS7: 2165 case ISAKMP_CERT_PGP: 2166 case ISAKMP_CERT_X509SIGN: 2167 case ISAKMP_CERT_KERBEROS: 2168 case ISAKMP_CERT_SPKI: 2169 c = &iph1->cert_p; 2170 break; 2171 case ISAKMP_CERT_CRL: 2172 c = &iph1->crl_p; 2173 break; 2174 case ISAKMP_CERT_X509KE: 2175 case ISAKMP_CERT_X509ATTR: 2176 case ISAKMP_CERT_ARL: 2177 plog(LLV_ERROR, LOCATION, NULL, 2178 "No supported such CERT type %d\n", type); 2179 return -1; 2180 default: 2181 plog(LLV_ERROR, LOCATION, NULL, 2182 "Invalid CERT type %d\n", type); 2183 return -1; 2184 } 2185 2186 /* XXX choice the 1th cert, ignore after the cert. */ 2187 /* XXX should be processed. */ 2188 if (*c) { 2189 plog(LLV_WARNING, LOCATION, NULL, 2190 "ignore 2nd CERT payload.\n"); 2191 return 0; 2192 } 2193 2194 if (type == ISAKMP_CERT_PKCS7) { 2195 u_char *bp; 2196 #if defined(OPENSSL_IS_BORINGSSL) 2197 size_t i; 2198 STACK_OF(X509) *certs = sk_X509_new_null(); 2199 CBS cbs; 2200 #else 2201 int i; 2202 #endif 2203 2204 /* Skip the header */ 2205 bp = (u_char *)(gen + 1); 2206 /* And the first byte is the certificate type, 2207 * we know that already 2208 */ 2209 bp++; 2210 #if defined(OPENSSL_IS_BORINGSSL) 2211 CBS_init(&cbs, bp, ntohs(gen->len) - sizeof(*gen) - 1); 2212 if (!PKCS7_get_certificates(certs, &cbs)) { 2213 plog(LLV_ERROR, LOCATION, NULL, 2214 "Failed to parse PKCS#7 CERT.\n"); 2215 sk_X509_pop_free(certs, X509_free); 2216 return -1; 2217 } 2218 2219 if (sk_X509_num(certs) == 0) { 2220 plog(LLV_ERROR, LOCATION, NULL, 2221 "CERT PKCS#7 bundle contains no certs.\n"); 2222 sk_X509_pop_free(certs, X509_free); 2223 return -1; 2224 } 2225 #else 2226 p7 = d2i_PKCS7(NULL, (void *)&bp, 2227 ntohs(gen->len) - sizeof(*gen) - 1); 2228 2229 if (!p7) { 2230 plog(LLV_ERROR, LOCATION, NULL, 2231 "Failed to parse PKCS#7 CERT.\n"); 2232 return -1; 2233 } 2234 2235 /* Copied this from the openssl pkcs7 application; 2236 * there"s little by way of documentation for any of 2237 * it. I can only presume it"s correct. 2238 */ 2239 2240 i = OBJ_obj2nid(p7->type); 2241 switch (i) { 2242 case NID_pkcs7_signed: 2243 certs=p7->d.sign->cert; 2244 break; 2245 case NID_pkcs7_signedAndEnveloped: 2246 certs=p7->d.signed_and_enveloped->cert; 2247 break; 2248 default: 2249 break; 2250 } 2251 2252 if (!certs) { 2253 plog(LLV_ERROR, LOCATION, NULL, 2254 "CERT PKCS#7 bundle contains no certs.\n"); 2255 PKCS7_free(p7); 2256 return -1; 2257 } 2258 #endif 2259 2260 for (i = 0; i < sk_X509_num(certs); i++) { 2261 int len; 2262 u_char *bp; 2263 X509 *cert = sk_X509_value(certs,i); 2264 2265 plog(LLV_DEBUG, LOCATION, NULL, 2266 "Trying PKCS#7 cert %d.\n", i); 2267 2268 /* We'll just try each cert in turn */ 2269 *c = save_certx509(cert); 2270 2271 if (!*c) { 2272 plog(LLV_ERROR, LOCATION, NULL, 2273 "Failed to get CERT buffer.\n"); 2274 continue; 2275 } 2276 2277 /* Ignore cert if it doesn't match identity 2278 * XXX If verify cert is disabled, we still just take 2279 * the first certificate.... 2280 */ 2281 if(iph1->rmconf->verify_cert && 2282 oakley_check_certid(iph1)) { 2283 plog(LLV_DEBUG, LOCATION, NULL, 2284 "Discarding CERT: does not match ID.\n"); 2285 oakley_delcert((*c)); 2286 *c = NULL; 2287 continue; 2288 } 2289 2290 { 2291 char *p = eay_get_x509text(&(*c)->cert); 2292 plog(LLV_DEBUG, LOCATION, NULL, "CERT saved:\n"); 2293 plogdump(LLV_DEBUG, (*c)->cert.v, (*c)->cert.l); 2294 plog(LLV_DEBUG, LOCATION, NULL, "%s", 2295 p ? p : "\n"); 2296 racoon_free(p); 2297 } 2298 break; 2299 } 2300 2301 #if defined(OPENSSL_IS_BORINGSSL) 2302 sk_X509_pop_free(certs, X509_free); 2303 #else 2304 PKCS7_free(p7); 2305 #endif 2306 2307 } else { 2308 *c = save_certbuf(gen); 2309 if (!*c) { 2310 plog(LLV_ERROR, LOCATION, NULL, 2311 "Failed to get CERT buffer.\n"); 2312 return -1; 2313 } 2314 2315 switch ((*c)->type) { 2316 case ISAKMP_CERT_DNS: 2317 plog(LLV_WARNING, LOCATION, NULL, 2318 "CERT payload is unnecessary in DNSSEC. " 2319 "ignore it.\n"); 2320 return 0; 2321 case ISAKMP_CERT_PGP: 2322 case ISAKMP_CERT_X509SIGN: 2323 case ISAKMP_CERT_KERBEROS: 2324 case ISAKMP_CERT_SPKI: 2325 /* Ignore cert if it doesn't match identity 2326 * XXX If verify cert is disabled, we still just take 2327 * the first certificate.... 2328 */ 2329 if(iph1->rmconf->verify_cert && 2330 oakley_check_certid(iph1)){ 2331 plog(LLV_DEBUG, LOCATION, NULL, 2332 "Discarding CERT: does not match ID.\n"); 2333 oakley_delcert((*c)); 2334 *c = NULL; 2335 return 0; 2336 } 2337 2338 { 2339 char *p = eay_get_x509text(&(*c)->cert); 2340 plog(LLV_DEBUG, LOCATION, NULL, "CERT saved:\n"); 2341 plogdump(LLV_DEBUG, (*c)->cert.v, (*c)->cert.l); 2342 plog(LLV_DEBUG, LOCATION, NULL, "%s", p ? p : "\n"); 2343 racoon_free(p); 2344 } 2345 break; 2346 case ISAKMP_CERT_CRL: 2347 plog(LLV_DEBUG, LOCATION, NULL, "CRL saved:\n"); 2348 plogdump(LLV_DEBUG, (*c)->cert.v, (*c)->cert.l); 2349 break; 2350 case ISAKMP_CERT_X509KE: 2351 case ISAKMP_CERT_X509ATTR: 2352 case ISAKMP_CERT_ARL: 2353 default: 2354 /* XXX */ 2355 oakley_delcert((*c)); 2356 *c = NULL; 2357 return 0; 2358 } 2359 } 2360 2361 return 0; 2362 } 2363 2364 /* 2365 * save certificate including certificate type. 2366 */ 2367 int 2368 oakley_savecr(iph1, gen) 2369 struct ph1handle *iph1; 2370 struct isakmp_gen *gen; 2371 { 2372 cert_t **c; 2373 u_int8_t type; 2374 2375 type = *(u_int8_t *)(gen + 1) & 0xff; 2376 2377 switch (type) { 2378 case ISAKMP_CERT_DNS: 2379 plog(LLV_WARNING, LOCATION, NULL, 2380 "CERT payload is unnecessary in DNSSEC\n"); 2381 /*FALLTHRU*/ 2382 case ISAKMP_CERT_PKCS7: 2383 case ISAKMP_CERT_PGP: 2384 case ISAKMP_CERT_X509SIGN: 2385 case ISAKMP_CERT_KERBEROS: 2386 case ISAKMP_CERT_SPKI: 2387 c = &iph1->cr_p; 2388 break; 2389 case ISAKMP_CERT_X509KE: 2390 case ISAKMP_CERT_X509ATTR: 2391 case ISAKMP_CERT_ARL: 2392 plog(LLV_ERROR, LOCATION, NULL, 2393 "No supported such CR type %d\n", type); 2394 return -1; 2395 case ISAKMP_CERT_CRL: 2396 default: 2397 plog(LLV_ERROR, LOCATION, NULL, 2398 "Invalid CR type %d\n", type); 2399 return -1; 2400 } 2401 2402 *c = save_certbuf(gen); 2403 if (!*c) { 2404 plog(LLV_ERROR, LOCATION, NULL, 2405 "Failed to get CR buffer.\n"); 2406 return -1; 2407 } 2408 2409 plog(LLV_DEBUG, LOCATION, NULL, "CR saved:\n"); 2410 plogdump(LLV_DEBUG, (*c)->cert.v, (*c)->cert.l); 2411 2412 return 0; 2413 } 2414 2415 static cert_t * 2416 save_certbuf(gen) 2417 struct isakmp_gen *gen; 2418 { 2419 cert_t *new; 2420 2421 if(ntohs(gen->len) <= sizeof(*gen)){ 2422 plog(LLV_ERROR, LOCATION, NULL, 2423 "Len is too small !!.\n"); 2424 return NULL; 2425 } 2426 2427 new = oakley_newcert(); 2428 if (!new) { 2429 plog(LLV_ERROR, LOCATION, NULL, 2430 "Failed to get CERT buffer.\n"); 2431 return NULL; 2432 } 2433 2434 new->pl = vmalloc(ntohs(gen->len) - sizeof(*gen)); 2435 if (new->pl == NULL) { 2436 plog(LLV_ERROR, LOCATION, NULL, 2437 "Failed to copy CERT from packet.\n"); 2438 oakley_delcert(new); 2439 new = NULL; 2440 return NULL; 2441 } 2442 memcpy(new->pl->v, gen + 1, new->pl->l); 2443 new->type = new->pl->v[0] & 0xff; 2444 new->cert.v = new->pl->v + 1; 2445 new->cert.l = new->pl->l - 1; 2446 2447 return new; 2448 } 2449 2450 static cert_t * 2451 save_certx509(cert) 2452 X509 *cert; 2453 { 2454 cert_t *new; 2455 int len; 2456 u_char *bp; 2457 2458 new = oakley_newcert(); 2459 if (!new) { 2460 plog(LLV_ERROR, LOCATION, NULL, 2461 "Failed to get CERT buffer.\n"); 2462 return NULL; 2463 } 2464 2465 len = i2d_X509(cert, NULL); 2466 new->pl = vmalloc(len); 2467 if (new->pl == NULL) { 2468 plog(LLV_ERROR, LOCATION, NULL, 2469 "Failed to copy CERT from packet.\n"); 2470 oakley_delcert(new); 2471 new = NULL; 2472 return NULL; 2473 } 2474 bp = (u_char *) new->pl->v; 2475 len = i2d_X509(cert, &bp); 2476 new->type = ISAKMP_CERT_X509SIGN; 2477 new->cert.v = new->pl->v; 2478 new->cert.l = new->pl->l; 2479 2480 return new; 2481 } 2482 2483 /* 2484 * get my CR. 2485 * NOTE: No Certificate Authority field is included to CR payload at the 2486 * moment. Becuase any certificate authority are accepted without any check. 2487 * The section 3.10 in RFC2408 says that this field SHOULD not be included, 2488 * if there is no specific certificate authority requested. 2489 */ 2490 vchar_t * 2491 oakley_getcr(iph1) 2492 struct ph1handle *iph1; 2493 { 2494 vchar_t *buf; 2495 2496 buf = vmalloc(1); 2497 if (buf == NULL) { 2498 plog(LLV_ERROR, LOCATION, NULL, 2499 "failed to get cr buffer\n"); 2500 return NULL; 2501 } 2502 if(iph1->rmconf->certtype == ISAKMP_CERT_NONE) { 2503 buf->v[0] = iph1->rmconf->cacerttype; 2504 plog(LLV_DEBUG, LOCATION, NULL, "create my CR: NONE, using %s instead\n", 2505 s_isakmp_certtype(iph1->rmconf->cacerttype)); 2506 } else { 2507 buf->v[0] = iph1->rmconf->certtype; 2508 plog(LLV_DEBUG, LOCATION, NULL, "create my CR: %s\n", 2509 s_isakmp_certtype(iph1->rmconf->certtype)); 2510 } 2511 if (buf->l > 1) { 2512 plogdump(LLV_DEBUG, buf->v, buf->l); 2513 } 2514 2515 return buf; 2516 } 2517 2518 /* 2519 * check peer's CR. 2520 */ 2521 int 2522 oakley_checkcr(iph1) 2523 struct ph1handle *iph1; 2524 { 2525 if (iph1->cr_p == NULL) 2526 return 0; 2527 2528 plog(LLV_DEBUG, LOCATION, iph1->remote, 2529 "peer transmitted CR: %s\n", 2530 s_isakmp_certtype(iph1->cr_p->type)); 2531 2532 if (iph1->cr_p->type != iph1->rmconf->certtype) { 2533 plog(LLV_ERROR, LOCATION, iph1->remote, 2534 "such a cert type isn't supported: %d\n", 2535 (char)iph1->cr_p->type); 2536 return -1; 2537 } 2538 2539 return 0; 2540 } 2541 2542 /* 2543 * check to need CR payload. 2544 */ 2545 int 2546 oakley_needcr(type) 2547 int type; 2548 { 2549 switch (type) { 2550 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG: 2551 case OAKLEY_ATTR_AUTH_METHOD_RSASIG: 2552 #ifdef ENABLE_HYBRID 2553 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I: 2554 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I: 2555 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I: 2556 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R: 2557 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I: 2558 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R: 2559 #endif 2560 return 1; 2561 default: 2562 return 0; 2563 } 2564 /*NOTREACHED*/ 2565 } 2566 2567 /* 2568 * compute SKEYID 2569 * see seciton 5. Exchanges in RFC 2409 2570 * psk: SKEYID = prf(pre-shared-key, Ni_b | Nr_b) 2571 * sig: SKEYID = prf(Ni_b | Nr_b, g^ir) 2572 * enc: SKEYID = prf(H(Ni_b | Nr_b), CKY-I | CKY-R) 2573 */ 2574 int 2575 oakley_skeyid(iph1) 2576 struct ph1handle *iph1; 2577 { 2578 vchar_t *buf = NULL, *bp; 2579 char *p; 2580 int len; 2581 int error = -1; 2582 2583 /* SKEYID */ 2584 switch (AUTHMETHOD(iph1)) { 2585 case OAKLEY_ATTR_AUTH_METHOD_PSKEY: 2586 #ifdef ENABLE_HYBRID 2587 case FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I: 2588 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R: 2589 #endif 2590 if (iph1->etype != ISAKMP_ETYPE_IDENT) { 2591 iph1->authstr = getpskbyname(iph1->id_p); 2592 if (iph1->authstr == NULL) { 2593 if (iph1->rmconf->verify_identifier) { 2594 plog(LLV_ERROR, LOCATION, iph1->remote, 2595 "couldn't find the pskey.\n"); 2596 goto end; 2597 } 2598 plog(LLV_NOTIFY, LOCATION, iph1->remote, 2599 "couldn't find the proper pskey, " 2600 "try to get one by the peer's address.\n"); 2601 } 2602 } 2603 if (iph1->authstr == NULL) { 2604 /* 2605 * If the exchange type is the main mode or if it's 2606 * failed to get the psk by ID, racoon try to get 2607 * the psk by remote IP address. 2608 * It may be nonsense. 2609 */ 2610 iph1->authstr = getpskbyaddr(iph1->remote); 2611 if (iph1->authstr == NULL) { 2612 plog(LLV_ERROR, LOCATION, iph1->remote, 2613 "couldn't find the pskey for %s.\n", 2614 saddrwop2str(iph1->remote)); 2615 goto end; 2616 } 2617 } 2618 plog(LLV_DEBUG, LOCATION, NULL, "the psk found.\n"); 2619 /* should be secret PSK */ 2620 plog(LLV_DEBUG2, LOCATION, NULL, "psk: "); 2621 plogdump(LLV_DEBUG2, iph1->authstr->v, iph1->authstr->l); 2622 2623 len = iph1->nonce->l + iph1->nonce_p->l; 2624 buf = vmalloc(len); 2625 if (buf == NULL) { 2626 plog(LLV_ERROR, LOCATION, NULL, 2627 "failed to get skeyid buffer\n"); 2628 goto end; 2629 } 2630 p = buf->v; 2631 2632 bp = (iph1->side == INITIATOR ? iph1->nonce : iph1->nonce_p); 2633 plog(LLV_DEBUG, LOCATION, NULL, "nonce 1: "); 2634 plogdump(LLV_DEBUG, bp->v, bp->l); 2635 memcpy(p, bp->v, bp->l); 2636 p += bp->l; 2637 2638 bp = (iph1->side == INITIATOR ? iph1->nonce_p : iph1->nonce); 2639 plog(LLV_DEBUG, LOCATION, NULL, "nonce 2: "); 2640 plogdump(LLV_DEBUG, bp->v, bp->l); 2641 memcpy(p, bp->v, bp->l); 2642 p += bp->l; 2643 2644 iph1->skeyid = oakley_prf(iph1->authstr, buf, iph1); 2645 if (iph1->skeyid == NULL) 2646 goto end; 2647 break; 2648 2649 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG: 2650 case OAKLEY_ATTR_AUTH_METHOD_RSASIG: 2651 #ifdef ENABLE_HYBRID 2652 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I: 2653 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I: 2654 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R: 2655 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R: 2656 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I: 2657 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R: 2658 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I: 2659 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R: 2660 #endif 2661 #ifdef HAVE_GSSAPI 2662 case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB: 2663 #endif 2664 len = iph1->nonce->l + iph1->nonce_p->l; 2665 buf = vmalloc(len); 2666 if (buf == NULL) { 2667 plog(LLV_ERROR, LOCATION, NULL, 2668 "failed to get nonce buffer\n"); 2669 goto end; 2670 } 2671 p = buf->v; 2672 2673 bp = (iph1->side == INITIATOR ? iph1->nonce : iph1->nonce_p); 2674 plog(LLV_DEBUG, LOCATION, NULL, "nonce1: "); 2675 plogdump(LLV_DEBUG, bp->v, bp->l); 2676 memcpy(p, bp->v, bp->l); 2677 p += bp->l; 2678 2679 bp = (iph1->side == INITIATOR ? iph1->nonce_p : iph1->nonce); 2680 plog(LLV_DEBUG, LOCATION, NULL, "nonce2: "); 2681 plogdump(LLV_DEBUG, bp->v, bp->l); 2682 memcpy(p, bp->v, bp->l); 2683 p += bp->l; 2684 2685 iph1->skeyid = oakley_prf(buf, iph1->dhgxy, iph1); 2686 if (iph1->skeyid == NULL) 2687 goto end; 2688 break; 2689 case OAKLEY_ATTR_AUTH_METHOD_RSAENC: 2690 case OAKLEY_ATTR_AUTH_METHOD_RSAREV: 2691 #ifdef ENABLE_HYBRID 2692 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I: 2693 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R: 2694 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I: 2695 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R: 2696 #endif 2697 plog(LLV_WARNING, LOCATION, NULL, 2698 "not supported authentication method %s\n", 2699 s_oakley_attr_method(iph1->approval->authmethod)); 2700 goto end; 2701 default: 2702 plog(LLV_ERROR, LOCATION, NULL, 2703 "invalid authentication method %d\n", 2704 iph1->approval->authmethod); 2705 goto end; 2706 } 2707 2708 plog(LLV_DEBUG, LOCATION, NULL, "SKEYID computed:\n"); 2709 plogdump(LLV_DEBUG, iph1->skeyid->v, iph1->skeyid->l); 2710 2711 error = 0; 2712 2713 end: 2714 if (buf != NULL) 2715 vfree(buf); 2716 return error; 2717 } 2718 2719 /* 2720 * compute SKEYID_[dae] 2721 * see seciton 5. Exchanges in RFC 2409 2722 * SKEYID_d = prf(SKEYID, g^ir | CKY-I | CKY-R | 0) 2723 * SKEYID_a = prf(SKEYID, SKEYID_d | g^ir | CKY-I | CKY-R | 1) 2724 * SKEYID_e = prf(SKEYID, SKEYID_a | g^ir | CKY-I | CKY-R | 2) 2725 */ 2726 int 2727 oakley_skeyid_dae(iph1) 2728 struct ph1handle *iph1; 2729 { 2730 vchar_t *buf = NULL; 2731 char *p; 2732 int len; 2733 int error = -1; 2734 2735 if (iph1->skeyid == NULL) { 2736 plog(LLV_ERROR, LOCATION, NULL, "no SKEYID found.\n"); 2737 goto end; 2738 } 2739 2740 /* SKEYID D */ 2741 /* SKEYID_d = prf(SKEYID, g^xy | CKY-I | CKY-R | 0) */ 2742 len = iph1->dhgxy->l + sizeof(cookie_t) * 2 + 1; 2743 buf = vmalloc(len); 2744 if (buf == NULL) { 2745 plog(LLV_ERROR, LOCATION, NULL, 2746 "failed to get skeyid buffer\n"); 2747 goto end; 2748 } 2749 p = buf->v; 2750 2751 memcpy(p, iph1->dhgxy->v, iph1->dhgxy->l); 2752 p += iph1->dhgxy->l; 2753 memcpy(p, (caddr_t)&iph1->index.i_ck, sizeof(cookie_t)); 2754 p += sizeof(cookie_t); 2755 memcpy(p, (caddr_t)&iph1->index.r_ck, sizeof(cookie_t)); 2756 p += sizeof(cookie_t); 2757 *p = 0; 2758 iph1->skeyid_d = oakley_prf(iph1->skeyid, buf, iph1); 2759 if (iph1->skeyid_d == NULL) 2760 goto end; 2761 2762 vfree(buf); 2763 buf = NULL; 2764 2765 plog(LLV_DEBUG, LOCATION, NULL, "SKEYID_d computed:\n"); 2766 plogdump(LLV_DEBUG, iph1->skeyid_d->v, iph1->skeyid_d->l); 2767 2768 /* SKEYID A */ 2769 /* SKEYID_a = prf(SKEYID, SKEYID_d | g^xy | CKY-I | CKY-R | 1) */ 2770 len = iph1->skeyid_d->l + iph1->dhgxy->l + sizeof(cookie_t) * 2 + 1; 2771 buf = vmalloc(len); 2772 if (buf == NULL) { 2773 plog(LLV_ERROR, LOCATION, NULL, 2774 "failed to get skeyid buffer\n"); 2775 goto end; 2776 } 2777 p = buf->v; 2778 memcpy(p, iph1->skeyid_d->v, iph1->skeyid_d->l); 2779 p += iph1->skeyid_d->l; 2780 memcpy(p, iph1->dhgxy->v, iph1->dhgxy->l); 2781 p += iph1->dhgxy->l; 2782 memcpy(p, (caddr_t)&iph1->index.i_ck, sizeof(cookie_t)); 2783 p += sizeof(cookie_t); 2784 memcpy(p, (caddr_t)&iph1->index.r_ck, sizeof(cookie_t)); 2785 p += sizeof(cookie_t); 2786 *p = 1; 2787 iph1->skeyid_a = oakley_prf(iph1->skeyid, buf, iph1); 2788 if (iph1->skeyid_a == NULL) 2789 goto end; 2790 2791 vfree(buf); 2792 buf = NULL; 2793 2794 plog(LLV_DEBUG, LOCATION, NULL, "SKEYID_a computed:\n"); 2795 plogdump(LLV_DEBUG, iph1->skeyid_a->v, iph1->skeyid_a->l); 2796 2797 /* SKEYID E */ 2798 /* SKEYID_e = prf(SKEYID, SKEYID_a | g^xy | CKY-I | CKY-R | 2) */ 2799 len = iph1->skeyid_a->l + iph1->dhgxy->l + sizeof(cookie_t) * 2 + 1; 2800 buf = vmalloc(len); 2801 if (buf == NULL) { 2802 plog(LLV_ERROR, LOCATION, NULL, 2803 "failed to get skeyid buffer\n"); 2804 goto end; 2805 } 2806 p = buf->v; 2807 memcpy(p, iph1->skeyid_a->v, iph1->skeyid_a->l); 2808 p += iph1->skeyid_a->l; 2809 memcpy(p, iph1->dhgxy->v, iph1->dhgxy->l); 2810 p += iph1->dhgxy->l; 2811 memcpy(p, (caddr_t)&iph1->index.i_ck, sizeof(cookie_t)); 2812 p += sizeof(cookie_t); 2813 memcpy(p, (caddr_t)&iph1->index.r_ck, sizeof(cookie_t)); 2814 p += sizeof(cookie_t); 2815 *p = 2; 2816 iph1->skeyid_e = oakley_prf(iph1->skeyid, buf, iph1); 2817 if (iph1->skeyid_e == NULL) 2818 goto end; 2819 2820 vfree(buf); 2821 buf = NULL; 2822 2823 plog(LLV_DEBUG, LOCATION, NULL, "SKEYID_e computed:\n"); 2824 plogdump(LLV_DEBUG, iph1->skeyid_e->v, iph1->skeyid_e->l); 2825 2826 error = 0; 2827 2828 end: 2829 if (buf != NULL) 2830 vfree(buf); 2831 return error; 2832 } 2833 2834 /* 2835 * compute final encryption key. 2836 * see Appendix B. 2837 */ 2838 int 2839 oakley_compute_enckey(iph1) 2840 struct ph1handle *iph1; 2841 { 2842 u_int keylen, prflen; 2843 int error = -1; 2844 2845 /* RFC2409 p39 */ 2846 keylen = alg_oakley_encdef_keylen(iph1->approval->enctype, 2847 iph1->approval->encklen); 2848 if (keylen == -1) { 2849 plog(LLV_ERROR, LOCATION, NULL, 2850 "invalid encryption algoritym %d, " 2851 "or invalid key length %d.\n", 2852 iph1->approval->enctype, 2853 iph1->approval->encklen); 2854 goto end; 2855 } 2856 iph1->key = vmalloc(keylen >> 3); 2857 if (iph1->key == NULL) { 2858 plog(LLV_ERROR, LOCATION, NULL, 2859 "failed to get key buffer\n"); 2860 goto end; 2861 } 2862 2863 /* set prf length */ 2864 prflen = alg_oakley_hashdef_hashlen(iph1->approval->hashtype); 2865 if (prflen == -1) { 2866 plog(LLV_ERROR, LOCATION, NULL, 2867 "invalid hash type %d.\n", iph1->approval->hashtype); 2868 goto end; 2869 } 2870 2871 /* see isakmp-oakley-08 5.3. */ 2872 if (iph1->key->l <= iph1->skeyid_e->l) { 2873 /* 2874 * if length(Ka) <= length(SKEYID_e) 2875 * Ka = first length(K) bit of SKEYID_e 2876 */ 2877 memcpy(iph1->key->v, iph1->skeyid_e->v, iph1->key->l); 2878 } else { 2879 vchar_t *buf = NULL, *res = NULL; 2880 u_char *p, *ep; 2881 int cplen; 2882 int subkey; 2883 2884 /* 2885 * otherwise, 2886 * Ka = K1 | K2 | K3 2887 * where 2888 * K1 = prf(SKEYID_e, 0) 2889 * K2 = prf(SKEYID_e, K1) 2890 * K3 = prf(SKEYID_e, K2) 2891 */ 2892 plog(LLV_DEBUG, LOCATION, NULL, 2893 "len(SKEYID_e) < len(Ka) (%zu < %zu), " 2894 "generating long key (Ka = K1 | K2 | ...)\n", 2895 iph1->skeyid_e->l, iph1->key->l); 2896 2897 if ((buf = vmalloc(prflen >> 3)) == 0) { 2898 plog(LLV_ERROR, LOCATION, NULL, 2899 "failed to get key buffer\n"); 2900 goto end; 2901 } 2902 p = (u_char *)iph1->key->v; 2903 ep = p + iph1->key->l; 2904 2905 subkey = 1; 2906 while (p < ep) { 2907 if (p == (u_char *)iph1->key->v) { 2908 /* just for computing K1 */ 2909 buf->v[0] = 0; 2910 buf->l = 1; 2911 } 2912 res = oakley_prf(iph1->skeyid_e, buf, iph1); 2913 if (res == NULL) { 2914 vfree(buf); 2915 goto end; 2916 } 2917 plog(LLV_DEBUG, LOCATION, NULL, 2918 "compute intermediate encryption key K%d\n", 2919 subkey); 2920 plogdump(LLV_DEBUG, buf->v, buf->l); 2921 plogdump(LLV_DEBUG, res->v, res->l); 2922 2923 cplen = (res->l < ep - p) ? res->l : ep - p; 2924 memcpy(p, res->v, cplen); 2925 p += cplen; 2926 2927 buf->l = prflen >> 3; /* to cancel K1 speciality */ 2928 if (res->l != buf->l) { 2929 plog(LLV_ERROR, LOCATION, NULL, 2930 "internal error: res->l=%zu buf->l=%zu\n", 2931 res->l, buf->l); 2932 vfree(res); 2933 vfree(buf); 2934 goto end; 2935 } 2936 memcpy(buf->v, res->v, res->l); 2937 vfree(res); 2938 subkey++; 2939 } 2940 2941 vfree(buf); 2942 } 2943 2944 /* 2945 * don't check any weak key or not. 2946 * draft-ietf-ipsec-ike-01.txt Appendix B. 2947 * draft-ietf-ipsec-ciph-aes-cbc-00.txt Section 2.3. 2948 */ 2949 #if 0 2950 /* weakkey check */ 2951 if (iph1->approval->enctype > ARRAYLEN(oakley_encdef) 2952 || oakley_encdef[iph1->approval->enctype].weakkey == NULL) { 2953 plog(LLV_ERROR, LOCATION, NULL, 2954 "encryption algoritym %d isn't supported.\n", 2955 iph1->approval->enctype); 2956 goto end; 2957 } 2958 if ((oakley_encdef[iph1->approval->enctype].weakkey)(iph1->key)) { 2959 plog(LLV_ERROR, LOCATION, NULL, 2960 "weakkey was generated.\n"); 2961 goto end; 2962 } 2963 #endif 2964 2965 plog(LLV_DEBUG, LOCATION, NULL, "final encryption key computed:\n"); 2966 plogdump(LLV_DEBUG, iph1->key->v, iph1->key->l); 2967 2968 error = 0; 2969 2970 end: 2971 return error; 2972 } 2973 2974 /* allocated new buffer for CERT */ 2975 cert_t * 2976 oakley_newcert() 2977 { 2978 cert_t *new; 2979 2980 new = racoon_calloc(1, sizeof(*new)); 2981 if (new == NULL) { 2982 plog(LLV_ERROR, LOCATION, NULL, 2983 "failed to get cert's buffer\n"); 2984 return NULL; 2985 } 2986 2987 new->pl = NULL; 2988 2989 return new; 2990 } 2991 2992 /* delete buffer for CERT */ 2993 void 2994 oakley_delcert(cert) 2995 cert_t *cert; 2996 { 2997 if (!cert) 2998 return; 2999 if (cert->pl) 3000 VPTRINIT(cert->pl); 3001 racoon_free(cert); 3002 } 3003 3004 /* 3005 * compute IV and set to ph1handle 3006 * IV = hash(g^xi | g^xr) 3007 * see 4.1 Phase 1 state in draft-ietf-ipsec-ike. 3008 */ 3009 int 3010 oakley_newiv(iph1) 3011 struct ph1handle *iph1; 3012 { 3013 struct isakmp_ivm *newivm = NULL; 3014 vchar_t *buf = NULL, *bp; 3015 char *p; 3016 int len; 3017 3018 /* create buffer */ 3019 len = iph1->dhpub->l + iph1->dhpub_p->l; 3020 buf = vmalloc(len); 3021 if (buf == NULL) { 3022 plog(LLV_ERROR, LOCATION, NULL, 3023 "failed to get iv buffer\n"); 3024 return -1; 3025 } 3026 3027 p = buf->v; 3028 3029 bp = (iph1->side == INITIATOR ? iph1->dhpub : iph1->dhpub_p); 3030 memcpy(p, bp->v, bp->l); 3031 p += bp->l; 3032 3033 bp = (iph1->side == INITIATOR ? iph1->dhpub_p : iph1->dhpub); 3034 memcpy(p, bp->v, bp->l); 3035 p += bp->l; 3036 3037 /* allocate IVm */ 3038 newivm = racoon_calloc(1, sizeof(struct isakmp_ivm)); 3039 if (newivm == NULL) { 3040 plog(LLV_ERROR, LOCATION, NULL, 3041 "failed to get iv buffer\n"); 3042 vfree(buf); 3043 return -1; 3044 } 3045 3046 /* compute IV */ 3047 newivm->iv = oakley_hash(buf, iph1); 3048 if (newivm->iv == NULL) { 3049 vfree(buf); 3050 oakley_delivm(newivm); 3051 return -1; 3052 } 3053 3054 /* adjust length of iv */ 3055 newivm->iv->l = alg_oakley_encdef_blocklen(iph1->approval->enctype); 3056 if (newivm->iv->l == -1) { 3057 plog(LLV_ERROR, LOCATION, NULL, 3058 "invalid encryption algoriym %d.\n", 3059 iph1->approval->enctype); 3060 vfree(buf); 3061 oakley_delivm(newivm); 3062 return -1; 3063 } 3064 3065 /* create buffer to save iv */ 3066 if ((newivm->ive = vdup(newivm->iv)) == NULL) { 3067 plog(LLV_ERROR, LOCATION, NULL, 3068 "vdup (%s)\n", strerror(errno)); 3069 vfree(buf); 3070 oakley_delivm(newivm); 3071 return -1; 3072 } 3073 3074 vfree(buf); 3075 3076 plog(LLV_DEBUG, LOCATION, NULL, "IV computed:\n"); 3077 plogdump(LLV_DEBUG, newivm->iv->v, newivm->iv->l); 3078 3079 iph1->ivm = newivm; 3080 3081 return 0; 3082 } 3083 3084 /* 3085 * compute IV for the payload after phase 1. 3086 * It's not limited for phase 2. 3087 * if pahse 1 was encrypted. 3088 * IV = hash(last CBC block of Phase 1 | M-ID) 3089 * if phase 1 was not encrypted. 3090 * IV = hash(phase 1 IV | M-ID) 3091 * see 4.2 Phase 2 state in draft-ietf-ipsec-ike. 3092 */ 3093 struct isakmp_ivm * 3094 oakley_newiv2(iph1, msgid) 3095 struct ph1handle *iph1; 3096 u_int32_t msgid; 3097 { 3098 struct isakmp_ivm *newivm = NULL; 3099 vchar_t *buf = NULL; 3100 char *p; 3101 int len; 3102 int error = -1; 3103 3104 /* create buffer */ 3105 len = iph1->ivm->iv->l + sizeof(msgid_t); 3106 buf = vmalloc(len); 3107 if (buf == NULL) { 3108 plog(LLV_ERROR, LOCATION, NULL, 3109 "failed to get iv buffer\n"); 3110 goto end; 3111 } 3112 3113 p = buf->v; 3114 3115 memcpy(p, iph1->ivm->iv->v, iph1->ivm->iv->l); 3116 p += iph1->ivm->iv->l; 3117 3118 memcpy(p, &msgid, sizeof(msgid)); 3119 3120 plog(LLV_DEBUG, LOCATION, NULL, "compute IV for phase2\n"); 3121 plog(LLV_DEBUG, LOCATION, NULL, "phase1 last IV:\n"); 3122 plogdump(LLV_DEBUG, buf->v, buf->l); 3123 3124 /* allocate IVm */ 3125 newivm = racoon_calloc(1, sizeof(struct isakmp_ivm)); 3126 if (newivm == NULL) { 3127 plog(LLV_ERROR, LOCATION, NULL, 3128 "failed to get iv buffer\n"); 3129 goto end; 3130 } 3131 3132 /* compute IV */ 3133 if ((newivm->iv = oakley_hash(buf, iph1)) == NULL) 3134 goto end; 3135 3136 /* adjust length of iv */ 3137 newivm->iv->l = alg_oakley_encdef_blocklen(iph1->approval->enctype); 3138 if (newivm->iv->l == -1) { 3139 plog(LLV_ERROR, LOCATION, NULL, 3140 "invalid encryption algoriym %d.\n", 3141 iph1->approval->enctype); 3142 goto end; 3143 } 3144 3145 /* create buffer to save new iv */ 3146 if ((newivm->ive = vdup(newivm->iv)) == NULL) { 3147 plog(LLV_ERROR, LOCATION, NULL, "vdup (%s)\n", strerror(errno)); 3148 goto end; 3149 } 3150 3151 error = 0; 3152 3153 plog(LLV_DEBUG, LOCATION, NULL, "phase2 IV computed:\n"); 3154 plogdump(LLV_DEBUG, newivm->iv->v, newivm->iv->l); 3155 3156 end: 3157 if (error && newivm != NULL){ 3158 oakley_delivm(newivm); 3159 newivm=NULL; 3160 } 3161 if (buf != NULL) 3162 vfree(buf); 3163 return newivm; 3164 } 3165 3166 void 3167 oakley_delivm(ivm) 3168 struct isakmp_ivm *ivm; 3169 { 3170 if (ivm == NULL) 3171 return; 3172 3173 if (ivm->iv != NULL) 3174 vfree(ivm->iv); 3175 if (ivm->ive != NULL) 3176 vfree(ivm->ive); 3177 racoon_free(ivm); 3178 plog(LLV_DEBUG, LOCATION, NULL, "IV freed\n"); 3179 3180 return; 3181 } 3182 3183 /* 3184 * decrypt packet. 3185 * save new iv and old iv. 3186 */ 3187 vchar_t * 3188 oakley_do_decrypt(iph1, msg, ivdp, ivep) 3189 struct ph1handle *iph1; 3190 vchar_t *msg, *ivdp, *ivep; 3191 { 3192 vchar_t *buf = NULL, *new = NULL; 3193 char *pl; 3194 int len; 3195 u_int8_t padlen; 3196 int blen; 3197 int error = -1; 3198 3199 plog(LLV_DEBUG, LOCATION, NULL, "begin decryption.\n"); 3200 3201 blen = alg_oakley_encdef_blocklen(iph1->approval->enctype); 3202 if (blen == -1) { 3203 plog(LLV_ERROR, LOCATION, NULL, 3204 "invalid encryption algoriym %d.\n", 3205 iph1->approval->enctype); 3206 goto end; 3207 } 3208 3209 /* save IV for next, but not sync. */ 3210 memset(ivep->v, 0, ivep->l); 3211 memcpy(ivep->v, (caddr_t)&msg->v[msg->l - blen], blen); 3212 3213 plog(LLV_DEBUG, LOCATION, NULL, 3214 "IV was saved for next processing:\n"); 3215 plogdump(LLV_DEBUG, ivep->v, ivep->l); 3216 3217 pl = msg->v + sizeof(struct isakmp); 3218 3219 len = msg->l - sizeof(struct isakmp); 3220 3221 /* create buffer */ 3222 buf = vmalloc(len); 3223 if (buf == NULL) { 3224 plog(LLV_ERROR, LOCATION, NULL, 3225 "failed to get buffer to decrypt.\n"); 3226 goto end; 3227 } 3228 memcpy(buf->v, pl, len); 3229 3230 /* do decrypt */ 3231 new = alg_oakley_encdef_decrypt(iph1->approval->enctype, 3232 buf, iph1->key, ivdp); 3233 if (new == NULL || new->v == NULL || new->l == 0) { 3234 plog(LLV_ERROR, LOCATION, NULL, 3235 "decryption %d failed.\n", iph1->approval->enctype); 3236 goto end; 3237 } 3238 plog(LLV_DEBUG, LOCATION, NULL, "with key:\n"); 3239 plogdump(LLV_DEBUG, iph1->key->v, iph1->key->l); 3240 3241 vfree(buf); 3242 buf = NULL; 3243 3244 plog(LLV_DEBUG, LOCATION, NULL, "decrypted payload by IV:\n"); 3245 plogdump(LLV_DEBUG, ivdp->v, ivdp->l); 3246 3247 plog(LLV_DEBUG, LOCATION, NULL, 3248 "decrypted payload, but not trimed.\n"); 3249 plogdump(LLV_DEBUG, new->v, new->l); 3250 3251 /* get padding length */ 3252 if (lcconf->pad_excltail) 3253 padlen = new->v[new->l - 1] + 1; 3254 else 3255 padlen = new->v[new->l - 1]; 3256 plog(LLV_DEBUG, LOCATION, NULL, "padding len=%u\n", padlen); 3257 3258 /* trim padding */ 3259 if (lcconf->pad_strict) { 3260 if (padlen > new->l) { 3261 plog(LLV_ERROR, LOCATION, NULL, 3262 "invalied padding len=%u, buflen=%zu.\n", 3263 padlen, new->l); 3264 plogdump(LLV_ERROR, new->v, new->l); 3265 goto end; 3266 } 3267 new->l -= padlen; 3268 plog(LLV_DEBUG, LOCATION, NULL, "trimmed padding\n"); 3269 } else { 3270 plog(LLV_DEBUG, LOCATION, NULL, "skip to trim padding.\n"); 3271 } 3272 3273 /* create new buffer */ 3274 len = sizeof(struct isakmp) + new->l; 3275 buf = vmalloc(len); 3276 if (buf == NULL) { 3277 plog(LLV_ERROR, LOCATION, NULL, 3278 "failed to get buffer to decrypt.\n"); 3279 goto end; 3280 } 3281 memcpy(buf->v, msg->v, sizeof(struct isakmp)); 3282 memcpy(buf->v + sizeof(struct isakmp), new->v, new->l); 3283 ((struct isakmp *)buf->v)->len = htonl(buf->l); 3284 3285 plog(LLV_DEBUG, LOCATION, NULL, "decrypted.\n"); 3286 plogdump(LLV_DEBUG, buf->v, buf->l); 3287 3288 #ifdef HAVE_PRINT_ISAKMP_C 3289 isakmp_printpacket(buf, iph1->remote, iph1->local, 1); 3290 #endif 3291 3292 error = 0; 3293 3294 end: 3295 if (error && buf != NULL) { 3296 vfree(buf); 3297 buf = NULL; 3298 } 3299 if (new != NULL) 3300 vfree(new); 3301 3302 return buf; 3303 } 3304 3305 /* 3306 * encrypt packet. 3307 */ 3308 vchar_t * 3309 oakley_do_encrypt(iph1, msg, ivep, ivp) 3310 struct ph1handle *iph1; 3311 vchar_t *msg, *ivep, *ivp; 3312 { 3313 vchar_t *buf = 0, *new = 0; 3314 char *pl; 3315 int len; 3316 u_int padlen; 3317 int blen; 3318 int error = -1; 3319 3320 plog(LLV_DEBUG, LOCATION, NULL, "begin encryption.\n"); 3321 3322 /* set cbc block length */ 3323 blen = alg_oakley_encdef_blocklen(iph1->approval->enctype); 3324 if (blen == -1) { 3325 plog(LLV_ERROR, LOCATION, NULL, 3326 "invalid encryption algoriym %d.\n", 3327 iph1->approval->enctype); 3328 goto end; 3329 } 3330 3331 pl = msg->v + sizeof(struct isakmp); 3332 len = msg->l - sizeof(struct isakmp); 3333 3334 /* add padding */ 3335 padlen = oakley_padlen(len, blen); 3336 plog(LLV_DEBUG, LOCATION, NULL, "pad length = %u\n", padlen); 3337 3338 /* create buffer */ 3339 buf = vmalloc(len + padlen); 3340 if (buf == NULL) { 3341 plog(LLV_ERROR, LOCATION, NULL, 3342 "failed to get buffer to encrypt.\n"); 3343 goto end; 3344 } 3345 if (padlen) { 3346 int i; 3347 char *p = &buf->v[len]; 3348 if (lcconf->pad_random) { 3349 for (i = 0; i < padlen; i++) 3350 *p++ = eay_random() & 0xff; 3351 } 3352 } 3353 memcpy(buf->v, pl, len); 3354 3355 /* make pad into tail */ 3356 if (lcconf->pad_excltail) 3357 buf->v[len + padlen - 1] = padlen - 1; 3358 else 3359 buf->v[len + padlen - 1] = padlen; 3360 3361 plogdump(LLV_DEBUG, buf->v, buf->l); 3362 3363 /* do encrypt */ 3364 new = alg_oakley_encdef_encrypt(iph1->approval->enctype, 3365 buf, iph1->key, ivep); 3366 if (new == NULL) { 3367 plog(LLV_ERROR, LOCATION, NULL, 3368 "encryption %d failed.\n", iph1->approval->enctype); 3369 goto end; 3370 } 3371 plog(LLV_DEBUG, LOCATION, NULL, "with key:\n"); 3372 plogdump(LLV_DEBUG, iph1->key->v, iph1->key->l); 3373 3374 vfree(buf); 3375 buf = NULL; 3376 3377 plog(LLV_DEBUG, LOCATION, NULL, "encrypted payload by IV:\n"); 3378 plogdump(LLV_DEBUG, ivep->v, ivep->l); 3379 3380 /* save IV for next */ 3381 memset(ivp->v, 0, ivp->l); 3382 memcpy(ivp->v, (caddr_t)&new->v[new->l - blen], blen); 3383 3384 plog(LLV_DEBUG, LOCATION, NULL, "save IV for next:\n"); 3385 plogdump(LLV_DEBUG, ivp->v, ivp->l); 3386 3387 /* create new buffer */ 3388 len = sizeof(struct isakmp) + new->l; 3389 buf = vmalloc(len); 3390 if (buf == NULL) { 3391 plog(LLV_ERROR, LOCATION, NULL, 3392 "failed to get buffer to encrypt.\n"); 3393 goto end; 3394 } 3395 memcpy(buf->v, msg->v, sizeof(struct isakmp)); 3396 memcpy(buf->v + sizeof(struct isakmp), new->v, new->l); 3397 ((struct isakmp *)buf->v)->len = htonl(buf->l); 3398 3399 error = 0; 3400 3401 plog(LLV_DEBUG, LOCATION, NULL, "encrypted.\n"); 3402 3403 end: 3404 if (error && buf != NULL) { 3405 vfree(buf); 3406 buf = NULL; 3407 } 3408 if (new != NULL) 3409 vfree(new); 3410 3411 return buf; 3412 } 3413 3414 /* culculate padding length */ 3415 static int 3416 oakley_padlen(len, base) 3417 int len, base; 3418 { 3419 int padlen; 3420 3421 padlen = base - len % base; 3422 3423 if (lcconf->pad_randomlen) 3424 padlen += ((eay_random() % (lcconf->pad_maxsize + 1) + 1) * 3425 base); 3426 3427 return padlen; 3428 } 3429 3430
