| File: | src/sbin/isakmpd/ike_auth.c |
| Warning: | line 366, column 10 Result of 'calloc' is converted to a pointer of type 'u_int8_t', which is incompatible with sizeof operand type 'char' |
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| 1 | /* $OpenBSD: ike_auth.c,v 1.118 2020/07/07 17:33:40 tobhe Exp $ */ |
| 2 | /* $EOM: ike_auth.c,v 1.59 2000/11/21 00:21:31 angelos Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1998, 1999, 2000, 2001 Niklas Hallqvist. All rights reserved. |
| 6 | * Copyright (c) 1999 Niels Provos. All rights reserved. |
| 7 | * Copyright (c) 1999 Angelos D. Keromytis. All rights reserved. |
| 8 | * Copyright (c) 2000, 2001, 2003 Håkan Olsson. All rights reserved. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | /* |
| 32 | * This code was written under funding by Ericsson Radio Systems. |
| 33 | */ |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/stat.h> |
| 37 | #include <netinet/in.h> |
| 38 | #include <arpa/inet.h> |
| 39 | |
| 40 | #include <errno(*__errno()).h> |
| 41 | #include <fcntl.h> |
| 42 | #include <stdlib.h> |
| 43 | #include <string.h> |
| 44 | #include <unistd.h> |
| 45 | #include <regex.h> |
| 46 | #include <keynote.h> |
| 47 | #include <policy.h> |
| 48 | |
| 49 | #include "cert.h" |
| 50 | #include "conf.h" |
| 51 | #include "constants.h" |
| 52 | #if defined (USE_DNSSEC) |
| 53 | #include "dnssec.h" |
| 54 | #endif |
| 55 | #include "exchange.h" |
| 56 | #include "hash.h" |
| 57 | #include "ike_auth.h" |
| 58 | #include "ipsec.h" |
| 59 | #include "ipsec_doi.h" |
| 60 | #include "libcrypto.h" |
| 61 | #include "log.h" |
| 62 | #include "message.h" |
| 63 | #include "monitor.h" |
| 64 | #include "prf.h" |
| 65 | #include "transport.h" |
| 66 | #include "util.h" |
| 67 | #include "key.h" |
| 68 | #include "x509.h" |
| 69 | |
| 70 | #ifdef notyet |
| 71 | static u_int8_t *enc_gen_skeyid(struct exchange *, size_t *); |
| 72 | #endif |
| 73 | static u_int8_t *pre_shared_gen_skeyid(struct exchange *, size_t *); |
| 74 | |
| 75 | static int pre_shared_decode_hash(struct message *); |
| 76 | static int pre_shared_encode_hash(struct message *); |
| 77 | |
| 78 | static u_int8_t *sig_gen_skeyid(struct exchange *, size_t *); |
| 79 | static int rsa_sig_decode_hash(struct message *); |
| 80 | static int rsa_sig_encode_hash(struct message *); |
| 81 | |
| 82 | static int get_raw_key_from_file(int, u_int8_t *, size_t, RSA **); |
| 83 | |
| 84 | static int ike_auth_hash(struct exchange *, u_int8_t *); |
| 85 | |
| 86 | static struct ike_auth ike_auth[] = { |
| 87 | { |
| 88 | IKE_AUTH_PRE_SHARED1, pre_shared_gen_skeyid, |
| 89 | pre_shared_decode_hash, |
| 90 | pre_shared_encode_hash |
| 91 | }, |
| 92 | #ifdef notdef |
| 93 | { |
| 94 | IKE_AUTH_DSS2, sig_gen_skeyid, |
| 95 | pre_shared_decode_hash, |
| 96 | pre_shared_encode_hash |
| 97 | }, |
| 98 | #endif |
| 99 | { |
| 100 | IKE_AUTH_RSA_SIG3, sig_gen_skeyid, |
| 101 | rsa_sig_decode_hash, |
| 102 | rsa_sig_encode_hash |
| 103 | }, |
| 104 | #ifdef notdef |
| 105 | { |
| 106 | IKE_AUTH_RSA_ENC4, enc_gen_skeyid, |
| 107 | pre_shared_decode_hash, |
| 108 | pre_shared_encode_hash |
| 109 | }, |
| 110 | { |
| 111 | IKE_AUTH_RSA_ENC_REV5, enc_gen_skeyid, |
| 112 | pre_shared_decode_hash, |
| 113 | pre_shared_encode_hash |
| 114 | }, |
| 115 | #endif |
| 116 | }; |
| 117 | |
| 118 | struct ike_auth * |
| 119 | ike_auth_get(u_int16_t id) |
| 120 | { |
| 121 | size_t i; |
| 122 | |
| 123 | for (i = 0; i < sizeof ike_auth / sizeof ike_auth[0]; i++) |
| 124 | if (id == ike_auth[i].id) |
| 125 | return &ike_auth[i]; |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * Find and decode the configured key (pre-shared or public) for the |
| 131 | * peer denoted by ID. Stash the len in KEYLEN. |
| 132 | */ |
| 133 | static void * |
| 134 | ike_auth_get_key(int type, char *id, char *local_id, size_t *keylen) |
| 135 | { |
| 136 | char *key, *buf; |
| 137 | char *keyfile, *privkeyfile; |
| 138 | FILE *keyfp; |
| 139 | RSA *rsakey; |
| 140 | size_t fsize, pkflen; |
| 141 | int fd; |
| 142 | |
| 143 | switch (type) { |
| 144 | case IKE_AUTH_PRE_SHARED1: |
| 145 | /* Get the pre-shared key for our peer. */ |
| 146 | key = conf_get_str(id, "Authentication"); |
| 147 | if (!key && local_id) |
| 148 | key = conf_get_str(local_id, "Authentication"); |
| 149 | |
| 150 | if (!key) { |
| 151 | log_print("ike_auth_get_key: " |
| 152 | "no key found for peer \"%s\" or local ID \"%s\"", |
| 153 | id, local_id ? local_id : "<none>"); |
| 154 | return 0; |
| 155 | } |
| 156 | /* If the key starts with 0x it is in hex format. */ |
| 157 | if (strncasecmp(key, "0x", 2) == 0) { |
| 158 | *keylen = (strlen(key) - 1) / 2; |
| 159 | buf = malloc(*keylen); |
| 160 | if (!buf) { |
| 161 | log_error("ike_auth_get_key: malloc (%lu) " |
| 162 | "failed", (unsigned long)*keylen); |
| 163 | return 0; |
| 164 | } |
| 165 | if (hex2raw(key + 2, (unsigned char *)buf, *keylen)) { |
| 166 | free(buf); |
| 167 | log_print("ike_auth_get_key: invalid hex key " |
| 168 | "%s", key); |
| 169 | return 0; |
| 170 | } |
| 171 | key = buf; |
| 172 | } else { |
| 173 | buf = key; |
| 174 | key = strdup(buf); |
| 175 | if (!key) { |
| 176 | log_error("ike_auth_get_key: strdup() failed"); |
| 177 | return 0; |
| 178 | } |
| 179 | *keylen = strlen(key); |
| 180 | } |
| 181 | break; |
| 182 | |
| 183 | case IKE_AUTH_RSA_SIG3: |
| 184 | if (local_id && (keyfile = conf_get_str("KeyNote", |
| 185 | "Credential-directory")) != 0) { |
| 186 | struct stat sb; |
| 187 | struct keynote_deckey dc; |
| 188 | char *privkeyfile, *buf2; |
| 189 | size_t size; |
| 190 | |
| 191 | if (asprintf(&privkeyfile, "%s/%s/%s", keyfile, |
| 192 | local_id, PRIVATE_KEY_FILE"private_key") == -1) { |
| 193 | log_print("ike_auth_get_key: failed to asprintf()"); |
| 194 | return 0; |
| 195 | } |
| 196 | keyfile = privkeyfile; |
| 197 | |
| 198 | fd = monitor_open(keyfile, O_RDONLY0x0000, 0); |
| 199 | if (fd < 0) { |
| 200 | free(keyfile); |
| 201 | goto ignorekeynote; |
| 202 | } |
| 203 | |
| 204 | if (fstat(fd, &sb) == -1) { |
| 205 | log_print("ike_auth_get_key: fstat failed"); |
| 206 | free(keyfile); |
| 207 | close(fd); |
| 208 | return 0; |
| 209 | } |
| 210 | size = (size_t)sb.st_size; |
| 211 | |
| 212 | buf = calloc(size + 1, sizeof(char)); |
| 213 | if (!buf) { |
| 214 | log_print("ike_auth_get_key: failed allocating" |
| 215 | " %lu bytes", (unsigned long)size + 1); |
| 216 | free(keyfile); |
| 217 | close(fd); |
| 218 | return 0; |
| 219 | } |
| 220 | if (read(fd, buf, size) != (ssize_t)size) { |
| 221 | free(buf); |
| 222 | log_print("ike_auth_get_key: " |
| 223 | "failed reading %lu bytes from \"%s\"", |
| 224 | (unsigned long)size, keyfile); |
| 225 | free(keyfile); |
| 226 | close(fd); |
| 227 | return 0; |
| 228 | } |
| 229 | close(fd); |
| 230 | |
| 231 | /* Parse private key string */ |
| 232 | buf2 = kn_get_string(buf); |
| 233 | free(buf); |
| 234 | |
| 235 | if (!buf2 || kn_decode_key(&dc, buf2, |
| 236 | KEYNOTE_PRIVATE_KEY1) == -1) { |
| 237 | free(buf2); |
| 238 | log_print("ike_auth_get_key: failed decoding " |
| 239 | "key in \"%s\"", keyfile); |
| 240 | free(keyfile); |
| 241 | return 0; |
| 242 | } |
| 243 | free(buf2); |
| 244 | |
| 245 | if (dc.dec_algorithm != KEYNOTE_ALGORITHM_RSA6) { |
| 246 | log_print("ike_auth_get_key: wrong algorithm " |
| 247 | "type %d in \"%s\"", dc.dec_algorithm, |
| 248 | keyfile); |
| 249 | free(keyfile); |
| 250 | kn_free_key(&dc); |
| 251 | return 0; |
| 252 | } |
| 253 | free(keyfile); |
| 254 | return dc.dec_key; |
| 255 | } |
| 256 | ignorekeynote: |
| 257 | /* Otherwise, try X.509 */ |
| 258 | |
| 259 | privkeyfile = keyfile = NULL((void*)0); |
| 260 | fd = -1; |
| 261 | |
| 262 | if (local_id) { |
| 263 | /* Look in Private-key-directory. */ |
| 264 | keyfile = conf_get_str("X509-certificates", |
| 265 | "Private-key-directory"); |
| 266 | pkflen = strlen(keyfile) + strlen(local_id) + sizeof "/"; |
| 267 | privkeyfile = calloc(pkflen, sizeof(char)); |
| 268 | if (!privkeyfile) { |
| 269 | log_print("ike_auth_get_key: failed to " |
| 270 | "allocate %lu bytes", (unsigned long)pkflen); |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | snprintf(privkeyfile, pkflen, "%s/%s", keyfile, |
| 275 | local_id); |
| 276 | keyfile = privkeyfile; |
| 277 | |
| 278 | fd = monitor_open(keyfile, O_RDONLY0x0000, 0); |
| 279 | if (fd == -1 && errno(*__errno()) != ENOENT2) { |
| 280 | log_print("ike_auth_get_key: failed opening " |
| 281 | "\"%s\"", keyfile); |
| 282 | free(privkeyfile); |
| 283 | privkeyfile = NULL((void*)0); |
| 284 | keyfile = NULL((void*)0); |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | if (fd == -1) { |
| 289 | /* No key found, try default key. */ |
| 290 | keyfile = conf_get_str("X509-certificates", |
| 291 | "Private-key"); |
| 292 | |
| 293 | fd = monitor_open(keyfile, O_RDONLY0x0000, 0); |
| 294 | if (fd == -1) { |
| 295 | log_print("ike_auth_get_key: failed opening " |
| 296 | "\"%s\"", keyfile); |
| 297 | return 0; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | if (check_file_secrecy_fd(fd, keyfile, &fsize)) { |
| 302 | free(privkeyfile); |
| 303 | close(fd); |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | if ((keyfp = fdopen(fd, "r")) == NULL((void*)0)) { |
| 308 | log_print("ike_auth_get_key: fdopen failed"); |
| 309 | free(privkeyfile); |
| 310 | close(fd); |
| 311 | return 0; |
| 312 | } |
| 313 | #if SSLEAY_VERSION_NUMBER0x20000000L >= 0x00904100L |
| 314 | rsakey = PEM_read_RSAPrivateKey(keyfp, NULL((void*)0), NULL((void*)0), NULL((void*)0)); |
| 315 | #else |
| 316 | rsakey = PEM_read_RSAPrivateKey(keyfp, NULL((void*)0), NULL((void*)0)); |
| 317 | #endif |
| 318 | fclose(keyfp); |
| 319 | |
| 320 | free(privkeyfile); |
| 321 | |
| 322 | if (!rsakey) { |
| 323 | log_print("ike_auth_get_key: " |
| 324 | "PEM_read_bio_RSAPrivateKey failed"); |
| 325 | return 0; |
| 326 | } |
| 327 | return rsakey; |
| 328 | |
| 329 | default: |
| 330 | log_print("ike_auth_get_key: unknown key type %d", type); |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | return key; |
| 335 | } |
| 336 | |
| 337 | static u_int8_t * |
| 338 | pre_shared_gen_skeyid(struct exchange *exchange, size_t *sz) |
| 339 | { |
| 340 | struct prf *prf; |
| 341 | struct ipsec_exch *ie = exchange->data; |
| 342 | u_int8_t *skeyid, *buf = 0; |
| 343 | unsigned char *key; |
| 344 | size_t keylen; |
| 345 | |
| 346 | /* |
| 347 | * If we're the responder and have the initiator's ID (which is the |
| 348 | * case in Aggressive mode), try to find the preshared key in the |
| 349 | * section of the initiator's Phase 1 ID. This allows us to do |
| 350 | * mobile user support with preshared keys. |
| 351 | */ |
| 352 | if (!exchange->initiator && exchange->id_i) { |
| 353 | switch (exchange->id_i[0]) { |
| 354 | case IPSEC_ID_IPV4_ADDR1: |
| 355 | case IPSEC_ID_IPV6_ADDR5: |
| 356 | util_ntoa((char **) &buf, |
| 357 | exchange->id_i[0] == IPSEC_ID_IPV4_ADDR1 ? AF_INET2 : |
| 358 | AF_INET624, exchange->id_i + ISAKMP_ID_DATA_OFF8 - |
| 359 | ISAKMP_GEN_SZ4); |
| 360 | if (!buf) |
| 361 | return 0; |
| 362 | break; |
| 363 | |
| 364 | case IPSEC_ID_FQDN2: |
| 365 | case IPSEC_ID_USER_FQDN3: |
| 366 | buf = calloc(exchange->id_i_len - ISAKMP_ID_DATA_OFF8 + |
Result of 'calloc' is converted to a pointer of type 'u_int8_t', which is incompatible with sizeof operand type 'char' | |
| 367 | ISAKMP_GEN_SZ4 + 1, sizeof(char)); |
| 368 | if (!buf) { |
| 369 | log_print("pre_shared_gen_skeyid: malloc (%lu" |
| 370 | ") failed", |
| 371 | (unsigned long)exchange->id_i_len - |
| 372 | ISAKMP_ID_DATA_OFF8 + ISAKMP_GEN_SZ4 + 1); |
| 373 | return 0; |
| 374 | } |
| 375 | memcpy(buf, |
| 376 | exchange->id_i + ISAKMP_ID_DATA_OFF8 - |
| 377 | ISAKMP_GEN_SZ4, |
| 378 | exchange->id_i_len - ISAKMP_ID_DATA_OFF8 + |
| 379 | ISAKMP_GEN_SZ4); |
| 380 | break; |
| 381 | |
| 382 | /* XXX Support more ID types ? */ |
| 383 | default: |
| 384 | break; |
| 385 | } |
| 386 | } |
| 387 | /* |
| 388 | * Get the pre-shared key for our peer. This will work even if the key |
| 389 | * has been passed to us through a mechanism like PFKEYv2. |
| 390 | */ |
| 391 | key = ike_auth_get_key(IKE_AUTH_PRE_SHARED1, exchange->name, |
| 392 | (char *)buf, &keylen); |
| 393 | free(buf); |
| 394 | |
| 395 | /* Fail if no key could be found. */ |
| 396 | if (!key) |
| 397 | return 0; |
| 398 | |
| 399 | /* Store the secret key for later policy processing. */ |
| 400 | exchange->recv_key = calloc(keylen + 1, sizeof(char)); |
| 401 | exchange->recv_keytype = ISAKMP_KEY_PASSPHRASE1; |
| 402 | if (!exchange->recv_key) { |
| 403 | log_error("pre_shared_gen_skeyid: malloc (%lu) failed", |
| 404 | (unsigned long)keylen); |
| 405 | free(key); |
| 406 | return 0; |
| 407 | } |
| 408 | memcpy(exchange->recv_key, key, keylen); |
| 409 | exchange->recv_certtype = ISAKMP_CERTENC_NONE0; |
| 410 | free(key); |
| 411 | |
| 412 | prf = prf_alloc(ie->prf_type, ie->hash->type, exchange->recv_key, |
| 413 | keylen); |
| 414 | if (!prf) |
| 415 | return 0; |
| 416 | |
| 417 | *sz = prf->blocksize; |
| 418 | skeyid = malloc(*sz); |
| 419 | if (!skeyid) { |
| 420 | log_error("pre_shared_gen_skeyid: malloc (%lu) failed", |
| 421 | (unsigned long)*sz); |
| 422 | prf_free(prf); |
| 423 | return 0; |
| 424 | } |
| 425 | prf->Init(prf->prfctx); |
| 426 | prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); |
| 427 | prf->Update(prf->prfctx, exchange->nonce_r, exchange->nonce_r_len); |
| 428 | prf->Final(skeyid, prf->prfctx); |
| 429 | prf_free(prf); |
| 430 | return skeyid; |
| 431 | } |
| 432 | |
| 433 | /* Both DSS & RSA signature authentication use this algorithm. */ |
| 434 | static u_int8_t * |
| 435 | sig_gen_skeyid(struct exchange *exchange, size_t *sz) |
| 436 | { |
| 437 | struct prf *prf; |
| 438 | struct ipsec_exch *ie = exchange->data; |
| 439 | u_int8_t *skeyid; |
| 440 | unsigned char *key; |
| 441 | |
| 442 | key = malloc(exchange->nonce_i_len + exchange->nonce_r_len); |
| 443 | if (!key) |
| 444 | return 0; |
| 445 | memcpy(key, exchange->nonce_i, exchange->nonce_i_len); |
| 446 | memcpy(key + exchange->nonce_i_len, exchange->nonce_r, |
| 447 | exchange->nonce_r_len); |
| 448 | |
| 449 | LOG_DBG((LOG_NEGOTIATION, 80, "sig_gen_skeyid: PRF type %d, hash %d",log_debug (LOG_NEGOTIATION, 80, "sig_gen_skeyid: PRF type %d, hash %d" , ie->prf_type, ie->hash->type) |
| 450 | ie->prf_type, ie->hash->type))log_debug (LOG_NEGOTIATION, 80, "sig_gen_skeyid: PRF type %d, hash %d" , ie->prf_type, ie->hash->type); |
| 451 | LOG_DBG_BUF((LOG_NEGOTIATION, 80,log_debug_buf (LOG_NEGOTIATION, 80, "sig_gen_skeyid: SKEYID initialized with" , (u_int8_t *)key, exchange->nonce_i_len + exchange->nonce_r_len ) |
| 452 | "sig_gen_skeyid: SKEYID initialized with",log_debug_buf (LOG_NEGOTIATION, 80, "sig_gen_skeyid: SKEYID initialized with" , (u_int8_t *)key, exchange->nonce_i_len + exchange->nonce_r_len ) |
| 453 | (u_int8_t *)key, exchange->nonce_i_len + exchange->nonce_r_len))log_debug_buf (LOG_NEGOTIATION, 80, "sig_gen_skeyid: SKEYID initialized with" , (u_int8_t *)key, exchange->nonce_i_len + exchange->nonce_r_len ); |
| 454 | |
| 455 | prf = prf_alloc(ie->prf_type, ie->hash->type, key, |
| 456 | exchange->nonce_i_len + exchange->nonce_r_len); |
| 457 | free(key); |
| 458 | if (!prf) |
| 459 | return 0; |
| 460 | |
| 461 | *sz = prf->blocksize; |
| 462 | skeyid = malloc(*sz); |
| 463 | if (!skeyid) { |
| 464 | log_error("sig_gen_skeyid: malloc (%lu) failed", |
| 465 | (unsigned long)*sz); |
| 466 | prf_free(prf); |
| 467 | return 0; |
| 468 | } |
| 469 | LOG_DBG((LOG_NEGOTIATION, 80, "sig_gen_skeyid: g^xy length %lu",log_debug (LOG_NEGOTIATION, 80, "sig_gen_skeyid: g^xy length %lu" , (unsigned long)ie->g_xy_len) |
| 470 | (unsigned long)ie->g_xy_len))log_debug (LOG_NEGOTIATION, 80, "sig_gen_skeyid: g^xy length %lu" , (unsigned long)ie->g_xy_len); |
| 471 | LOG_DBG_BUF((LOG_NEGOTIATION, 80,log_debug_buf (LOG_NEGOTIATION, 80, "sig_gen_skeyid: SKEYID fed with g^xy" , ie->g_xy, ie->g_xy_len) |
| 472 | "sig_gen_skeyid: SKEYID fed with g^xy", ie->g_xy, ie->g_xy_len))log_debug_buf (LOG_NEGOTIATION, 80, "sig_gen_skeyid: SKEYID fed with g^xy" , ie->g_xy, ie->g_xy_len); |
| 473 | |
| 474 | prf->Init(prf->prfctx); |
| 475 | prf->Update(prf->prfctx, ie->g_xy, ie->g_xy_len); |
| 476 | prf->Final(skeyid, prf->prfctx); |
| 477 | prf_free(prf); |
| 478 | return skeyid; |
| 479 | } |
| 480 | |
| 481 | #ifdef notdef |
| 482 | /* |
| 483 | * Both standard and revised RSA encryption authentication use this SKEYID |
| 484 | * computation. |
| 485 | */ |
| 486 | static u_int8_t * |
| 487 | enc_gen_skeyid(struct exchange *exchange, size_t *sz) |
| 488 | { |
| 489 | struct prf *prf; |
| 490 | struct ipsec_exch *ie = exchange->data; |
| 491 | struct hash *hash = ie->hash; |
| 492 | u_int8_t *skeyid; |
| 493 | |
| 494 | hash->Init(hash->ctx); |
| 495 | hash->Update(hash->ctx, exchange->nonce_i, exchange->nonce_i_len); |
| 496 | hash->Update(hash->ctx, exchange->nonce_r, exchange->nonce_r_len); |
| 497 | hash->Final(hash->digest, hash->ctx); |
| 498 | prf = prf_alloc(ie->prf_type, hash->type, hash->digest, *sz); |
| 499 | if (!prf) |
| 500 | return 0; |
| 501 | |
| 502 | *sz = prf->blocksize; |
| 503 | skeyid = malloc(*sz); |
| 504 | if (!skeyid) { |
| 505 | log_error("enc_gen_skeyid: malloc (%d) failed", *sz); |
| 506 | prf_free(prf); |
| 507 | return 0; |
| 508 | } |
| 509 | prf->Init(prf->prfctx); |
| 510 | prf->Update(prf->prfctx, exchange->cookies, ISAKMP_HDR_COOKIES_LEN(8 + 8)); |
| 511 | prf->Final(skeyid, prf->prfctx); |
| 512 | prf_free(prf); |
| 513 | return skeyid; |
| 514 | } |
| 515 | #endif /* notdef */ |
| 516 | |
| 517 | static int |
| 518 | pre_shared_decode_hash(struct message *msg) |
| 519 | { |
| 520 | struct exchange *exchange = msg->exchange; |
| 521 | struct ipsec_exch *ie = exchange->data; |
| 522 | struct payload *payload; |
| 523 | size_t hashsize = ie->hash->hashsize; |
| 524 | char header[80]; |
| 525 | int initiator = exchange->initiator; |
| 526 | u_int8_t **hash_p; |
| 527 | |
| 528 | /* Choose the right fields to fill-in. */ |
| 529 | hash_p = initiator ? &ie->hash_r : &ie->hash_i; |
| 530 | |
| 531 | payload = payload_first(msg, ISAKMP_PAYLOAD_HASH8); |
| 532 | if (!payload) { |
| 533 | log_print("pre_shared_decode_hash: no HASH payload found"); |
| 534 | return -1; |
| 535 | } |
| 536 | /* Check that the hash is of the correct size. */ |
| 537 | if (GET_ISAKMP_GEN_LENGTH(payload->p)field_get_num (isakmp_gen_fld + 2, payload->p) - ISAKMP_GEN_SZ4 != hashsize) |
| 538 | return -1; |
| 539 | |
| 540 | /* XXX Need this hash be in the SA? */ |
| 541 | *hash_p = malloc(hashsize); |
| 542 | if (!*hash_p) { |
| 543 | log_error("pre_shared_decode_hash: malloc (%lu) failed", |
| 544 | (unsigned long)hashsize); |
| 545 | return -1; |
| 546 | } |
| 547 | memcpy(*hash_p, payload->p + ISAKMP_HASH_DATA_OFF4, hashsize); |
| 548 | snprintf(header, sizeof header, "pre_shared_decode_hash: HASH_%c", |
| 549 | initiator ? 'R' : 'I'); |
| 550 | LOG_DBG_BUF((LOG_MISC, 80, header, *hash_p, hashsize))log_debug_buf (LOG_MISC, 80, header, *hash_p, hashsize); |
| 551 | |
| 552 | payload->flags |= PL_MARK1; |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | /* Decrypt the HASH in SIG, we already need a parsed ID payload. */ |
| 557 | static int |
| 558 | rsa_sig_decode_hash(struct message *msg) |
| 559 | { |
| 560 | struct cert_handler *handler; |
| 561 | struct exchange *exchange = msg->exchange; |
| 562 | struct ipsec_exch *ie = exchange->data; |
| 563 | struct payload *p; |
| 564 | void *cert = 0; |
| 565 | u_int8_t *rawcert = 0, **hash_p, **id_cert, *id; |
| 566 | u_int32_t rawcertlen, *id_cert_len; |
| 567 | RSA *key = 0; |
| 568 | size_t hashsize = ie->hash->hashsize, id_len; |
| 569 | char header[80]; |
| 570 | int len, initiator = exchange->initiator; |
| 571 | int found = 0, n, i, id_found; |
| 572 | #if defined (USE_DNSSEC) |
| 573 | u_int8_t *rawkey = 0; |
| 574 | u_int32_t rawkeylen; |
| 575 | #endif |
| 576 | |
| 577 | /* Choose the right fields to fill-in. */ |
| 578 | hash_p = initiator ? &ie->hash_r : &ie->hash_i; |
| 579 | id = initiator ? exchange->id_r : exchange->id_i; |
| 580 | id_len = initiator ? exchange->id_r_len : exchange->id_i_len; |
| 581 | |
| 582 | if (!id || id_len == 0) { |
| 583 | log_print("rsa_sig_decode_hash: ID is missing"); |
| 584 | return -1; |
| 585 | } |
| 586 | /* |
| 587 | * XXX Assume we should use the same kind of certification as the |
| 588 | * remote... moreover, just use the first CERT payload to decide what |
| 589 | * to use. |
| 590 | */ |
| 591 | p = payload_first(msg, ISAKMP_PAYLOAD_CERT6); |
| 592 | if (!p) |
| 593 | handler = cert_get(ISAKMP_CERTENC_KEYNOTE11); |
| 594 | else |
| 595 | handler = cert_get(GET_ISAKMP_CERT_ENCODING(p->p)field_get_num (isakmp_cert_fld + 0, p->p)); |
| 596 | if (!handler) { |
| 597 | log_print("rsa_sig_decode_hash: cert_get (%d) failed", |
| 598 | p ? GET_ISAKMP_CERT_ENCODING(p->p)field_get_num (isakmp_cert_fld + 0, p->p) : -1); |
| 599 | return -1; |
| 600 | } |
| 601 | /* |
| 602 | * We need the policy session initialized now, so we can add |
| 603 | * credentials etc. |
| 604 | */ |
| 605 | exchange->policy_id = kn_init(); |
| 606 | if (exchange->policy_id == -1) { |
| 607 | log_print("rsa_sig_decode_hash: failed to initialize policy " |
| 608 | "session"); |
| 609 | return -1; |
| 610 | } |
| 611 | |
| 612 | /* Obtain a certificate from our certificate storage. */ |
| 613 | if (handler->cert_obtain(id, id_len, 0, &rawcert, &rawcertlen)) { |
| 614 | if (handler->id == ISAKMP_CERTENC_X509_SIG4) { |
| 615 | cert = handler->cert_get(rawcert, rawcertlen); |
| 616 | if (!cert) |
| 617 | LOG_DBG((LOG_CRYPTO, 50, "rsa_sig_decode_hash:"log_debug (LOG_CRYPTO, 50, "rsa_sig_decode_hash:" " certificate malformed" ) |
| 618 | " certificate malformed"))log_debug (LOG_CRYPTO, 50, "rsa_sig_decode_hash:" " certificate malformed" ); |
| 619 | else { |
| 620 | if (!handler->cert_get_key(cert, &key)) { |
| 621 | log_print("rsa_sig_decode_hash: " |
| 622 | "decoding certificate failed"); |
| 623 | handler->cert_free(cert); |
| 624 | } else { |
| 625 | found++; |
| 626 | LOG_DBG((LOG_CRYPTO, 40,log_debug (LOG_CRYPTO, 40, "rsa_sig_decode_hash: using cert " "of type %d", handler->id) |
| 627 | "rsa_sig_decode_hash: using cert "log_debug (LOG_CRYPTO, 40, "rsa_sig_decode_hash: using cert " "of type %d", handler->id) |
| 628 | "of type %d", handler->id))log_debug (LOG_CRYPTO, 40, "rsa_sig_decode_hash: using cert " "of type %d", handler->id); |
| 629 | exchange->recv_cert = cert; |
| 630 | exchange->recv_certtype = handler->id; |
| 631 | x509_generate_kn(exchange->policy_id, |
| 632 | cert); |
| 633 | } |
| 634 | } |
| 635 | } else if (handler->id == ISAKMP_CERTENC_KEYNOTE11) |
| 636 | handler->cert_insert(exchange->policy_id, rawcert); |
| 637 | free(rawcert); |
| 638 | } |
| 639 | /* |
| 640 | * Walk over potential CERT payloads in this message. |
| 641 | * XXX I believe this is the wrong spot for this. CERTs can appear |
| 642 | * anytime. |
| 643 | */ |
| 644 | TAILQ_FOREACH(p, &msg->payload[ISAKMP_PAYLOAD_CERT], link)for((p) = ((&msg->payload[6])->tqh_first); (p) != ( (void*)0); (p) = ((p)->link.tqe_next)) { |
| 645 | p->flags |= PL_MARK1; |
| 646 | |
| 647 | /* |
| 648 | * When we have found a key, just walk over the rest, marking |
| 649 | * them. |
| 650 | */ |
| 651 | if (found) |
| 652 | continue; |
| 653 | |
| 654 | handler = cert_get(GET_ISAKMP_CERT_ENCODING(p->p)field_get_num (isakmp_cert_fld + 0, p->p)); |
| 655 | if (!handler) { |
| 656 | LOG_DBG((LOG_MISC, 30, "rsa_sig_decode_hash: "log_debug (LOG_MISC, 30, "rsa_sig_decode_hash: " "no handler for %s CERT encoding" , constant_name(isakmp_certenc_cst, field_get_num (isakmp_cert_fld + 0, p->p))) |
| 657 | "no handler for %s CERT encoding",log_debug (LOG_MISC, 30, "rsa_sig_decode_hash: " "no handler for %s CERT encoding" , constant_name(isakmp_certenc_cst, field_get_num (isakmp_cert_fld + 0, p->p))) |
| 658 | constant_name(isakmp_certenc_cst,log_debug (LOG_MISC, 30, "rsa_sig_decode_hash: " "no handler for %s CERT encoding" , constant_name(isakmp_certenc_cst, field_get_num (isakmp_cert_fld + 0, p->p))) |
| 659 | GET_ISAKMP_CERT_ENCODING(p->p))))log_debug (LOG_MISC, 30, "rsa_sig_decode_hash: " "no handler for %s CERT encoding" , constant_name(isakmp_certenc_cst, field_get_num (isakmp_cert_fld + 0, p->p))); |
| 660 | continue; |
| 661 | } |
| 662 | cert = handler->cert_get(p->p + ISAKMP_CERT_DATA_OFF5, |
| 663 | GET_ISAKMP_GEN_LENGTH(p->p)field_get_num (isakmp_gen_fld + 2, p->p) - ISAKMP_CERT_DATA_OFF5); |
| 664 | if (!cert) { |
| 665 | log_print("rsa_sig_decode_hash: " |
| 666 | "can not get data from CERT"); |
| 667 | continue; |
| 668 | } |
| 669 | if (!handler->cert_validate(cert)) { |
| 670 | handler->cert_free(cert); |
| 671 | log_print("rsa_sig_decode_hash: received CERT can't " |
| 672 | "be validated"); |
| 673 | continue; |
| 674 | } |
| 675 | if (GET_ISAKMP_CERT_ENCODING(p->p)field_get_num (isakmp_cert_fld + 0, p->p) == |
| 676 | ISAKMP_CERTENC_X509_SIG4) { |
| 677 | if (!handler->cert_get_subjects(cert, &n, &id_cert, |
| 678 | &id_cert_len)) { |
| 679 | handler->cert_free(cert); |
| 680 | log_print("rsa_sig_decode_hash: can not get " |
| 681 | "subject from CERT"); |
| 682 | continue; |
| 683 | } |
| 684 | id_found = 0; |
| 685 | for (i = 0; i < n; i++) |
| 686 | if (id_cert_len[i] == id_len && |
| 687 | id[0] == id_cert[i][0] && |
| 688 | memcmp(id + 4, id_cert[i] + 4, id_len - 4) |
| 689 | == 0) { |
| 690 | id_found++; |
| 691 | break; |
| 692 | } |
| 693 | if (!id_found) { |
| 694 | handler->cert_free(cert); |
| 695 | log_print("rsa_sig_decode_hash: no CERT " |
| 696 | "subject match the ID"); |
| 697 | free(id_cert); |
| 698 | continue; |
| 699 | } |
| 700 | cert_free_subjects(n, id_cert, id_cert_len); |
| 701 | } |
| 702 | if (!handler->cert_get_key(cert, &key)) { |
| 703 | handler->cert_free(cert); |
| 704 | log_print("rsa_sig_decode_hash: decoding payload CERT " |
| 705 | "failed"); |
| 706 | continue; |
| 707 | } |
| 708 | /* We validated the cert, cache it for later use. */ |
| 709 | handler->cert_insert(exchange->policy_id, cert); |
| 710 | |
| 711 | exchange->recv_cert = cert; |
| 712 | exchange->recv_certtype = GET_ISAKMP_CERT_ENCODING(p->p)field_get_num (isakmp_cert_fld + 0, p->p); |
| 713 | |
| 714 | if (exchange->recv_certtype == ISAKMP_CERTENC_KEYNOTE11) { |
| 715 | struct keynote_deckey dc; |
| 716 | char *pp; |
| 717 | |
| 718 | dc.dec_algorithm = KEYNOTE_ALGORITHM_RSA6; |
| 719 | dc.dec_key = key; |
| 720 | |
| 721 | pp = kn_encode_key(&dc, INTERNAL_ENC_PKCS11, |
| 722 | ENCODING_HEX1, KEYNOTE_PUBLIC_KEY0); |
| 723 | if (pp == NULL((void*)0)) { |
| 724 | kn_free_key(&dc); |
| 725 | log_print("rsa_sig_decode_hash: failed to " |
| 726 | "ASCII-encode key"); |
| 727 | return -1; |
| 728 | } |
| 729 | if (asprintf(&exchange->keynote_key, "rsa-hex:%s", |
| 730 | pp) == -1) { |
| 731 | free(pp); |
| 732 | kn_free_key(&dc); |
| 733 | log_print("rsa_sig_decode_hash: failed to asprintf()"); |
| 734 | return -1; |
| 735 | } |
| 736 | free(pp); |
| 737 | } |
| 738 | found++; |
| 739 | } |
| 740 | |
| 741 | #if defined (USE_DNSSEC) |
| 742 | /* |
| 743 | * If no certificate provided a key, try to find a validated DNSSEC |
| 744 | * KEY. |
| 745 | */ |
| 746 | if (!found) { |
| 747 | rawkey = dns_get_key(IKE_AUTH_RSA_SIG3, msg, &rawkeylen); |
| 748 | |
| 749 | /* We need to convert 'void *rawkey' into 'RSA *key'. */ |
| 750 | if (dns_RSA_dns_to_x509(rawkey, rawkeylen, &key) == 0) |
| 751 | found++; |
| 752 | else |
| 753 | log_print("rsa_sig_decode_hash: KEY to RSA key " |
| 754 | "conversion failed"); |
| 755 | |
| 756 | free(rawkey); |
| 757 | } |
| 758 | #endif /* USE_DNSSEC */ |
| 759 | |
| 760 | /* If we still have not found a key, try to read it from a file. */ |
| 761 | if (!found) |
| 762 | if (get_raw_key_from_file(IKE_AUTH_RSA_SIG3, id, id_len, &key) |
| 763 | != -1) |
| 764 | found++; |
| 765 | |
| 766 | if (!found) { |
| 767 | log_print("rsa_sig_decode_hash: no public key found"); |
| 768 | return -1; |
| 769 | } |
| 770 | p = payload_first(msg, ISAKMP_PAYLOAD_SIG9); |
| 771 | if (!p) { |
| 772 | log_print("rsa_sig_decode_hash: missing signature payload"); |
| 773 | RSA_free(key); |
| 774 | return -1; |
| 775 | } |
| 776 | /* Check that the sig is of the correct size. */ |
| 777 | len = GET_ISAKMP_GEN_LENGTH(p->p)field_get_num (isakmp_gen_fld + 2, p->p) - ISAKMP_SIG_SZ4; |
| 778 | if (len != RSA_size(key)) { |
| 779 | RSA_free(key); |
| 780 | log_print("rsa_sig_decode_hash: " |
| 781 | "SIG payload length does not match public key"); |
| 782 | return -1; |
| 783 | } |
| 784 | *hash_p = malloc(len); |
| 785 | if (!*hash_p) { |
| 786 | RSA_free(key); |
| 787 | log_error("rsa_sig_decode_hash: malloc (%d) failed", len); |
| 788 | return -1; |
| 789 | } |
| 790 | len = RSA_public_decrypt(len, p->p + ISAKMP_SIG_DATA_OFF4, *hash_p, key, |
| 791 | RSA_PKCS1_PADDING1); |
| 792 | if (len == -1) { |
| 793 | RSA_free(key); |
| 794 | log_print("rsa_sig_decode_hash: RSA_public_decrypt () failed"); |
| 795 | return -1; |
| 796 | } |
| 797 | /* Store key for later use */ |
| 798 | exchange->recv_key = key; |
| 799 | exchange->recv_keytype = ISAKMP_KEY_RSA2; |
| 800 | |
| 801 | if (len != (int)hashsize) { |
| 802 | free(*hash_p); |
| 803 | *hash_p = 0; |
| 804 | log_print("rsa_sig_decode_hash: len %lu != hashsize %lu", |
| 805 | (unsigned long)len, (unsigned long)hashsize); |
| 806 | return -1; |
| 807 | } |
| 808 | snprintf(header, sizeof header, "rsa_sig_decode_hash: HASH_%c", |
| 809 | initiator ? 'R' : 'I'); |
| 810 | LOG_DBG_BUF((LOG_MISC, 80, header, *hash_p, hashsize))log_debug_buf (LOG_MISC, 80, header, *hash_p, hashsize); |
| 811 | |
| 812 | p->flags |= PL_MARK1; |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | static int |
| 817 | pre_shared_encode_hash(struct message *msg) |
| 818 | { |
| 819 | struct exchange *exchange = msg->exchange; |
| 820 | struct ipsec_exch *ie = exchange->data; |
| 821 | size_t hashsize = ie->hash->hashsize; |
| 822 | char header[80]; |
| 823 | int initiator = exchange->initiator; |
| 824 | u_int8_t *buf; |
| 825 | |
| 826 | buf = ipsec_add_hash_payload(msg, hashsize); |
| 827 | if (!buf) |
| 828 | return -1; |
| 829 | |
| 830 | if (ike_auth_hash(exchange, buf + ISAKMP_HASH_DATA_OFF4) == -1) |
| 831 | return -1; |
| 832 | |
| 833 | snprintf(header, sizeof header, "pre_shared_encode_hash: HASH_%c", |
| 834 | initiator ? 'I' : 'R'); |
| 835 | LOG_DBG_BUF((LOG_MISC, 80, header, buf + ISAKMP_HASH_DATA_OFF,log_debug_buf (LOG_MISC, 80, header, buf + 4, hashsize) |
| 836 | hashsize))log_debug_buf (LOG_MISC, 80, header, buf + 4, hashsize); |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | /* Encrypt the HASH into a SIG type. */ |
| 841 | static int |
| 842 | rsa_sig_encode_hash(struct message *msg) |
| 843 | { |
| 844 | struct exchange *exchange = msg->exchange; |
| 845 | struct ipsec_exch *ie = exchange->data; |
| 846 | size_t hashsize = ie->hash->hashsize, id_len; |
| 847 | struct cert_handler *handler; |
| 848 | char header[80]; |
| 849 | int initiator = exchange->initiator, idtype; |
| 850 | u_int8_t *buf, *data, *buf2, *id; |
| 851 | u_int32_t datalen; |
| 852 | int32_t sigsize; |
| 853 | void *sent_key; |
| 854 | |
| 855 | id = initiator ? exchange->id_i : exchange->id_r; |
| 856 | id_len = initiator ? exchange->id_i_len : exchange->id_r_len; |
| 857 | |
| 858 | /* We may have been provided these by the kernel */ |
| 859 | buf = (u_int8_t *)conf_get_str(exchange->name, "Credentials"); |
| 860 | if (buf && (idtype = conf_get_num(exchange->name, "Credential_Type", |
| 861 | -1)) != -1) { |
| 862 | exchange->sent_certtype = idtype; |
| 863 | handler = cert_get(idtype); |
| 864 | if (!handler) { |
| 865 | log_print("rsa_sig_encode_hash: cert_get (%d) failed", |
| 866 | idtype); |
| 867 | return -1; |
| 868 | } |
| 869 | exchange->sent_cert = |
| 870 | handler->cert_from_printable((char *)buf); |
| 871 | if (!exchange->sent_cert) { |
| 872 | log_print("rsa_sig_encode_hash: failed to retrieve " |
| 873 | "certificate"); |
| 874 | return -1; |
| 875 | } |
| 876 | handler->cert_serialize(exchange->sent_cert, &data, &datalen); |
| 877 | if (!data) { |
| 878 | log_print("rsa_sig_encode_hash: cert serialization " |
| 879 | "failed"); |
| 880 | return -1; |
| 881 | } |
| 882 | goto aftercert; /* Skip all the certificate discovery */ |
| 883 | } |
| 884 | /* XXX This needs to be configurable. */ |
| 885 | idtype = ISAKMP_CERTENC_KEYNOTE11; |
| 886 | |
| 887 | /* Find a certificate with subjectAltName = id. */ |
| 888 | handler = cert_get(idtype); |
| 889 | if (!handler) { |
| 890 | idtype = ISAKMP_CERTENC_X509_SIG4; |
| 891 | handler = cert_get(idtype); |
| 892 | if (!handler) { |
| 893 | log_print("rsa_sig_encode_hash: cert_get(%d) failed", |
| 894 | idtype); |
| 895 | return -1; |
| 896 | } |
| 897 | } |
| 898 | if (handler->cert_obtain(id, id_len, 0, &data, &datalen) == 0) { |
| 899 | if (idtype == ISAKMP_CERTENC_KEYNOTE11) { |
| 900 | idtype = ISAKMP_CERTENC_X509_SIG4; |
| 901 | handler = cert_get(idtype); |
| 902 | if (!handler) { |
| 903 | log_print("rsa_sig_encode_hash: cert_get(%d) " |
| 904 | "failed", idtype); |
| 905 | return -1; |
| 906 | } |
| 907 | if (handler->cert_obtain(id, id_len, 0, &data, |
| 908 | &datalen) == 0) { |
| 909 | LOG_DBG((LOG_MISC, 10, "rsa_sig_encode_hash: "log_debug (LOG_MISC, 10, "rsa_sig_encode_hash: " "no certificate to send for id %s" , ipsec_id_string(id, id_len)) |
| 910 | "no certificate to send for id %s",log_debug (LOG_MISC, 10, "rsa_sig_encode_hash: " "no certificate to send for id %s" , ipsec_id_string(id, id_len)) |
| 911 | ipsec_id_string(id, id_len)))log_debug (LOG_MISC, 10, "rsa_sig_encode_hash: " "no certificate to send for id %s" , ipsec_id_string(id, id_len)); |
| 912 | goto skipcert; |
| 913 | } |
| 914 | } else { |
| 915 | LOG_DBG((LOG_MISC, 10,log_debug (LOG_MISC, 10, "rsa_sig_encode_hash: no certificate to send" " for id %s", ipsec_id_string(id, id_len)) |
| 916 | "rsa_sig_encode_hash: no certificate to send"log_debug (LOG_MISC, 10, "rsa_sig_encode_hash: no certificate to send" " for id %s", ipsec_id_string(id, id_len)) |
| 917 | " for id %s", ipsec_id_string(id, id_len)))log_debug (LOG_MISC, 10, "rsa_sig_encode_hash: no certificate to send" " for id %s", ipsec_id_string(id, id_len)); |
| 918 | goto skipcert; |
| 919 | } |
| 920 | } |
| 921 | /* Let's store the certificate we are going to use */ |
| 922 | exchange->sent_certtype = idtype; |
| 923 | exchange->sent_cert = handler->cert_get(data, datalen); |
| 924 | if (!exchange->sent_cert) { |
| 925 | free(data); |
| 926 | log_print("rsa_sig_encode_hash: failed to get certificate " |
| 927 | "from wire encoding"); |
| 928 | return -1; |
| 929 | } |
| 930 | aftercert: |
| 931 | |
| 932 | buf = realloc(data, ISAKMP_CERT_SZ5 + datalen); |
| 933 | if (!buf) { |
| 934 | log_error("rsa_sig_encode_hash: realloc (%p, %d) failed", data, |
| 935 | ISAKMP_CERT_SZ5 + datalen); |
| 936 | free(data); |
| 937 | return -1; |
| 938 | } |
| 939 | memmove(buf + ISAKMP_CERT_SZ5, buf, datalen); |
| 940 | SET_ISAKMP_CERT_ENCODING(buf, idtype)field_set_num (isakmp_cert_fld + 0, buf, idtype); |
| 941 | if (message_add_payload(msg, ISAKMP_PAYLOAD_CERT6, buf, |
| 942 | ISAKMP_CERT_SZ5 + datalen, 1)) { |
| 943 | free(buf); |
| 944 | return -1; |
| 945 | } |
| 946 | skipcert: |
| 947 | |
| 948 | /* Again, we may have these from the kernel */ |
| 949 | buf = (u_int8_t *)conf_get_str(exchange->name, "PKAuthentication"); |
| 950 | if (buf) { |
| 951 | key_from_printable(ISAKMP_KEY_RSA2, ISAKMP_KEYTYPE_PRIVATE1, |
| 952 | (char *)buf, &data, &datalen); |
| 953 | if (!data) { |
| 954 | log_print("rsa_sig_encode_hash: badly formatted RSA " |
| 955 | "private key"); |
| 956 | return 0; |
| 957 | } |
| 958 | sent_key = key_internalize(ISAKMP_KEY_RSA2, |
| 959 | ISAKMP_KEYTYPE_PRIVATE1, data, datalen); |
| 960 | if (!sent_key) { |
| 961 | log_print("rsa_sig_encode_hash: bad RSA private key " |
| 962 | "from dynamic SA acquisition subsystem"); |
| 963 | return 0; |
| 964 | } |
| 965 | } else { |
| 966 | /* Try through the regular means. */ |
| 967 | switch (id[ISAKMP_ID_TYPE_OFF4 - ISAKMP_GEN_SZ4]) { |
| 968 | case IPSEC_ID_IPV4_ADDR1: |
| 969 | case IPSEC_ID_IPV6_ADDR5: |
| 970 | util_ntoa((char **)&buf2, |
| 971 | id[ISAKMP_ID_TYPE_OFF4 - ISAKMP_GEN_SZ4] == |
| 972 | IPSEC_ID_IPV4_ADDR1 ? AF_INET2 : AF_INET624, |
| 973 | id + ISAKMP_ID_DATA_OFF8 - ISAKMP_GEN_SZ4); |
| 974 | if (!buf2) |
| 975 | return 0; |
| 976 | break; |
| 977 | |
| 978 | case IPSEC_ID_FQDN2: |
| 979 | case IPSEC_ID_USER_FQDN3: |
| 980 | buf2 = calloc(id_len - ISAKMP_ID_DATA_OFF8 + |
| 981 | ISAKMP_GEN_SZ4 + 1, sizeof(char)); |
| 982 | if (!buf2) { |
| 983 | log_print("rsa_sig_encode_hash: malloc (%lu) " |
| 984 | "failed", (unsigned long)id_len - |
| 985 | ISAKMP_ID_DATA_OFF8 + ISAKMP_GEN_SZ4 + 1); |
| 986 | return 0; |
| 987 | } |
| 988 | memcpy(buf2, id + ISAKMP_ID_DATA_OFF8 - ISAKMP_GEN_SZ4, |
| 989 | id_len - ISAKMP_ID_DATA_OFF8 + ISAKMP_GEN_SZ4); |
| 990 | break; |
| 991 | |
| 992 | /* XXX Support more ID types? */ |
| 993 | default: |
| 994 | buf2 = 0; |
| 995 | return 0; |
| 996 | } |
| 997 | |
| 998 | sent_key = ike_auth_get_key(IKE_AUTH_RSA_SIG3, exchange->name, |
| 999 | (char *)buf2, 0); |
| 1000 | free(buf2); |
| 1001 | |
| 1002 | /* Did we find a key? */ |
| 1003 | if (!sent_key) { |
| 1004 | log_print("rsa_sig_encode_hash: " |
| 1005 | "could not get private key"); |
| 1006 | return -1; |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | /* Enable RSA blinding. */ |
| 1011 | if (RSA_blinding_on(sent_key, NULL((void*)0)) != 1) { |
| 1012 | log_error("rsa_sig_encode_hash: RSA_blinding_on () failed."); |
| 1013 | RSA_free(sent_key); |
| 1014 | return -1; |
| 1015 | } |
| 1016 | /* XXX hashsize is not necessarily prf->blocksize. */ |
| 1017 | buf = malloc(hashsize); |
| 1018 | if (!buf) { |
| 1019 | log_error("rsa_sig_encode_hash: malloc (%lu) failed", |
| 1020 | (unsigned long)hashsize); |
| 1021 | RSA_free(sent_key); |
| 1022 | return -1; |
| 1023 | } |
| 1024 | if (ike_auth_hash(exchange, buf) == -1) { |
| 1025 | free(buf); |
| 1026 | RSA_free(sent_key); |
| 1027 | return -1; |
| 1028 | } |
| 1029 | snprintf(header, sizeof header, "rsa_sig_encode_hash: HASH_%c", |
| 1030 | initiator ? 'I' : 'R'); |
| 1031 | LOG_DBG_BUF((LOG_MISC, 80, header, buf, hashsize))log_debug_buf (LOG_MISC, 80, header, buf, hashsize); |
| 1032 | |
| 1033 | data = malloc(RSA_size(sent_key)); |
| 1034 | if (!data) { |
| 1035 | log_error("rsa_sig_encode_hash: malloc (%d) failed", |
| 1036 | RSA_size(sent_key)); |
| 1037 | free(buf); |
| 1038 | RSA_free(sent_key); |
| 1039 | return -1; |
| 1040 | } |
| 1041 | sigsize = RSA_private_encrypt(hashsize, buf, data, sent_key, |
| 1042 | RSA_PKCS1_PADDING1); |
| 1043 | if (sigsize == -1) { |
| 1044 | log_print("rsa_sig_encode_hash: " |
| 1045 | "RSA_private_encrypt () failed"); |
| 1046 | free(data); |
| 1047 | free(buf); |
| 1048 | RSA_free(sent_key); |
| 1049 | return -1; |
| 1050 | } |
| 1051 | datalen = (u_int32_t) sigsize; |
| 1052 | |
| 1053 | free(buf); |
| 1054 | RSA_free(sent_key); |
| 1055 | |
| 1056 | buf = realloc(data, ISAKMP_SIG_SZ4 + datalen); |
| 1057 | if (!buf) { |
| 1058 | log_error("rsa_sig_encode_hash: realloc (%p, %d) failed", data, |
| 1059 | ISAKMP_SIG_SZ4 + datalen); |
| 1060 | free(data); |
| 1061 | return -1; |
| 1062 | } |
| 1063 | memmove(buf + ISAKMP_SIG_SZ4, buf, datalen); |
| 1064 | |
| 1065 | snprintf(header, sizeof header, "rsa_sig_encode_hash: SIG_%c", |
| 1066 | initiator ? 'I' : 'R'); |
| 1067 | LOG_DBG_BUF((LOG_MISC, 80, header, buf + ISAKMP_SIG_DATA_OFF,log_debug_buf (LOG_MISC, 80, header, buf + 4, datalen) |
| 1068 | datalen))log_debug_buf (LOG_MISC, 80, header, buf + 4, datalen); |
| 1069 | if (message_add_payload(msg, ISAKMP_PAYLOAD_SIG9, buf, |
| 1070 | ISAKMP_SIG_SZ4 + datalen, 1)) { |
| 1071 | free(buf); |
| 1072 | return -1; |
| 1073 | } |
| 1074 | return 0; |
| 1075 | } |
| 1076 | |
| 1077 | int |
| 1078 | ike_auth_hash(struct exchange *exchange, u_int8_t *buf) |
| 1079 | { |
| 1080 | struct ipsec_exch *ie = exchange->data; |
| 1081 | struct prf *prf; |
| 1082 | struct hash *hash = ie->hash; |
| 1083 | int initiator = exchange->initiator; |
| 1084 | u_int8_t *id; |
| 1085 | size_t id_len; |
| 1086 | |
| 1087 | /* Choose the right fields to fill-in. */ |
| 1088 | id = initiator ? exchange->id_i : exchange->id_r; |
| 1089 | id_len = initiator ? exchange->id_i_len : exchange->id_r_len; |
| 1090 | |
| 1091 | /* Allocate the prf and start calculating our HASH. */ |
| 1092 | prf = prf_alloc(ie->prf_type, hash->type, ie->skeyid, ie->skeyid_len); |
| 1093 | if (!prf) |
| 1094 | return -1; |
| 1095 | |
| 1096 | prf->Init(prf->prfctx); |
| 1097 | prf->Update(prf->prfctx, initiator ? ie->g_xi : ie->g_xr, ie->g_x_len); |
| 1098 | prf->Update(prf->prfctx, initiator ? ie->g_xr : ie->g_xi, ie->g_x_len); |
| 1099 | prf->Update(prf->prfctx, exchange->cookies + |
| 1100 | (initiator ? ISAKMP_HDR_ICOOKIE_OFF0 : ISAKMP_HDR_RCOOKIE_OFF8), |
| 1101 | ISAKMP_HDR_ICOOKIE_LEN8); |
| 1102 | prf->Update(prf->prfctx, exchange->cookies + |
| 1103 | (initiator ? ISAKMP_HDR_RCOOKIE_OFF8 : ISAKMP_HDR_ICOOKIE_OFF0), |
| 1104 | ISAKMP_HDR_ICOOKIE_LEN8); |
| 1105 | prf->Update(prf->prfctx, ie->sa_i_b, ie->sa_i_b_len); |
| 1106 | prf->Update(prf->prfctx, id, id_len); |
| 1107 | prf->Final(buf, prf->prfctx); |
| 1108 | prf_free(prf); |
| 1109 | return 0; |
| 1110 | } |
| 1111 | |
| 1112 | static int |
| 1113 | get_raw_key_from_file(int type, u_int8_t *id, size_t id_len, RSA **rsa) |
| 1114 | { |
| 1115 | char filename[FILENAME_MAX1024]; |
| 1116 | char *fstr; |
| 1117 | FILE *keyfp; |
| 1118 | |
| 1119 | if (type != IKE_AUTH_RSA_SIG3) { /* XXX More types? */ |
| 1120 | LOG_DBG((LOG_NEGOTIATION, 20, "get_raw_key_from_file: "log_debug (LOG_NEGOTIATION, 20, "get_raw_key_from_file: " "invalid auth type %d\n" , type) |
| 1121 | "invalid auth type %d\n", type))log_debug (LOG_NEGOTIATION, 20, "get_raw_key_from_file: " "invalid auth type %d\n" , type); |
| 1122 | return -1; |
| 1123 | } |
| 1124 | *rsa = 0; |
| 1125 | |
| 1126 | fstr = conf_get_str("General", "Pubkey-directory"); |
| 1127 | if (!fstr) |
| 1128 | fstr = CONF_DFLT_PUBKEY_DIR"/etc/isakmpd/" "pubkeys/"; |
| 1129 | |
| 1130 | if (snprintf(filename, sizeof filename, "%s/", fstr) > |
| 1131 | (int)sizeof filename - 1) |
| 1132 | return -1; |
| 1133 | |
| 1134 | fstr = ipsec_id_string(id, id_len); |
| 1135 | if (!fstr) { |
| 1136 | LOG_DBG((LOG_NEGOTIATION, 50, "get_raw_key_from_file: "log_debug (LOG_NEGOTIATION, 50, "get_raw_key_from_file: " "ipsec_id_string failed" ) |
| 1137 | "ipsec_id_string failed"))log_debug (LOG_NEGOTIATION, 50, "get_raw_key_from_file: " "ipsec_id_string failed" ); |
| 1138 | return -1; |
| 1139 | } |
| 1140 | strlcat(filename, fstr, sizeof filename - strlen(filename)); |
| 1141 | free(fstr); |
| 1142 | |
| 1143 | /* If the file does not exist, fail silently. */ |
| 1144 | keyfp = monitor_fopen(filename, "r"); |
| 1145 | if (keyfp) { |
| 1146 | *rsa = PEM_read_RSA_PUBKEY(keyfp, NULL((void*)0), NULL((void*)0), NULL((void*)0)); |
| 1147 | if (!*rsa) { |
| 1148 | rewind(keyfp); |
| 1149 | *rsa = PEM_read_RSAPublicKey(keyfp, NULL((void*)0), NULL((void*)0), NULL((void*)0)); |
| 1150 | } |
| 1151 | if (!*rsa) |
| 1152 | log_print("get_raw_key_from_file: failed to get " |
| 1153 | "public key %s", filename); |
| 1154 | fclose(keyfp); |
| 1155 | } else if (errno(*__errno()) != ENOENT2) { |
| 1156 | log_error("get_raw_key_from_file: monitor_fopen " |
| 1157 | "(\"%s\", \"r\") failed", filename); |
| 1158 | return -1; |
| 1159 | } else |
| 1160 | LOG_DBG((LOG_NEGOTIATION, 50,log_debug (LOG_NEGOTIATION, 50, "get_raw_key_from_file: file %s not found" , filename) |
| 1161 | "get_raw_key_from_file: file %s not found", filename))log_debug (LOG_NEGOTIATION, 50, "get_raw_key_from_file: file %s not found" , filename); |
| 1162 | |
| 1163 | return (*rsa ? 0 : -1); |
| 1164 | } |