| 1 | #include <ldns/config.h> |
| 2 | |
| 3 | #include <ldns/ldns.h> |
| 4 | |
| 5 | #include <strings.h> |
| 6 | #include <time.h> |
| 7 | |
| 8 | #ifdef HAVE_SSL |
| 9 | /* this entire file is rather useless when you don't have |
| 10 | * crypto... |
| 11 | */ |
| 12 | #include <openssl/ssl.h> |
| 13 | #include <openssl/evp.h> |
| 14 | #include <openssl/rand.h> |
| 15 | #include <openssl/err.h> |
| 16 | #include <openssl/md5.h> |
| 17 | |
| 18 | ldns_dnssec_data_chain * |
| 19 | ldns_dnssec_data_chain_new() |
| 20 | { |
| 21 | ldns_dnssec_data_chain *nc = LDNS_XMALLOC(ldns_dnssec_data_chain, 1); |
| 22 | nc->rrset = NULL; |
| 23 | nc->parent_type = 0; |
| 24 | nc->parent = NULL; |
| 25 | nc->signatures = NULL; |
| 26 | nc->packet_rcode = 0; |
| 27 | nc->packet_qtype = 0; |
| 28 | nc->packet_nodata = false; |
| 29 | return nc; |
| 30 | } |
| 31 | |
| 32 | void |
| 33 | ldns_dnssec_data_chain_free(ldns_dnssec_data_chain *chain) |
| 34 | { |
| 35 | LDNS_FREE(chain); |
| 36 | } |
| 37 | |
| 38 | void |
| 39 | ldns_dnssec_data_chain_deep_free(ldns_dnssec_data_chain *chain) |
| 40 | { |
| 41 | ldns_rr_list_deep_free(chain->rrset); |
| 42 | ldns_rr_list_deep_free(chain->signatures); |
| 43 | if (chain->parent) { |
| 44 | ldns_dnssec_data_chain_deep_free(chain->parent); |
| 45 | } |
| 46 | LDNS_FREE(chain); |
| 47 | } |
| 48 | |
| 49 | void |
| 50 | ldns_dnssec_data_chain_print(FILE *out, const ldns_dnssec_data_chain *chain) |
| 51 | { |
| 52 | ldns_lookup_table *rcode; |
| 53 | const ldns_rr_descriptor *rr_descriptor; |
| 54 | if (chain) { |
| 55 | ldns_dnssec_data_chain_print(out, chain->parent); |
| 56 | if (ldns_rr_list_rr_count(chain->rrset) > 0) { |
| 57 | rcode = ldns_lookup_by_id(ldns_rcodes, |
| 58 | (int) chain->packet_rcode); |
| 59 | if (rcode) { |
| 60 | fprintf(out, ";; rcode: %s\n", rcode->name); |
| 61 | } |
| 62 | |
| 63 | rr_descriptor = ldns_rr_descript(chain->packet_qtype); |
| 64 | if (rr_descriptor && rr_descriptor->_name) { |
| 65 | fprintf(out, ";; qtype: %s\n", rr_descriptor->_name); |
| 66 | } else if (chain->packet_qtype != 0) { |
| 67 | fprintf(out, "TYPE%u", |
| 68 | chain->packet_qtype); |
| 69 | } |
| 70 | if (chain->packet_nodata) { |
| 71 | fprintf(out, ";; NODATA response\n"); |
| 72 | } |
| 73 | fprintf(out, "rrset:\n"); |
| 74 | ldns_rr_list_print(out, chain->rrset); |
| 75 | fprintf(out, "sigs:\n"); |
| 76 | ldns_rr_list_print(out, chain->signatures); |
| 77 | fprintf(out, "---\n"); |
| 78 | } else { |
| 79 | fprintf(out, "<no data>\n"); |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | static void |
| 85 | ldns_dnssec_build_data_chain_dnskey(ldns_resolver *res, |
| 86 | uint16_t qflags, |
| 87 | const ldns_pkt *pkt, |
| 88 | ldns_rr_list *signatures, |
| 89 | ldns_dnssec_data_chain *new_chain, |
| 90 | ldns_rdf *key_name, |
| 91 | ldns_rr_class c) { |
| 92 | ldns_rr_list *keys; |
| 93 | ldns_pkt *my_pkt; |
| 94 | if (signatures && ldns_rr_list_rr_count(signatures) > 0) { |
| 95 | new_chain->signatures = ldns_rr_list_clone(signatures); |
| 96 | new_chain->parent_type = 0; |
| 97 | |
| 98 | keys = ldns_pkt_rr_list_by_name_and_type( |
| 99 | pkt, |
| 100 | key_name, |
| 101 | LDNS_RR_TYPE_DNSKEY, |
| 102 | LDNS_SECTION_ANY_NOQUESTION |
| 103 | ); |
| 104 | if (!keys) { |
| 105 | my_pkt = ldns_resolver_query(res, |
| 106 | key_name, |
| 107 | LDNS_RR_TYPE_DNSKEY, |
| 108 | c, |
| 109 | qflags); |
| 110 | keys = ldns_pkt_rr_list_by_name_and_type( |
| 111 | my_pkt, |
| 112 | key_name, |
| 113 | LDNS_RR_TYPE_DNSKEY, |
| 114 | LDNS_SECTION_ANY_NOQUESTION |
| 115 | ); |
| 116 | new_chain->parent = ldns_dnssec_build_data_chain(res, |
| 117 | qflags, |
| 118 | keys, |
| 119 | my_pkt, |
| 120 | NULL); |
| 121 | new_chain->parent->packet_qtype = LDNS_RR_TYPE_DNSKEY; |
| 122 | ldns_pkt_free(my_pkt); |
| 123 | } else { |
| 124 | new_chain->parent = ldns_dnssec_build_data_chain(res, |
| 125 | qflags, |
| 126 | keys, |
| 127 | pkt, |
| 128 | NULL); |
| 129 | new_chain->parent->packet_qtype = LDNS_RR_TYPE_DNSKEY; |
| 130 | } |
| 131 | ldns_rr_list_deep_free(keys); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | static void |
| 136 | ldns_dnssec_build_data_chain_other(ldns_resolver *res, |
| 137 | uint16_t qflags, |
| 138 | ldns_dnssec_data_chain *new_chain, |
| 139 | ldns_rdf *key_name, |
| 140 | ldns_rr_class c, |
| 141 | ldns_rr_list *dss) |
| 142 | { |
| 143 | /* 'self-signed', parent is a DS */ |
| 144 | |
| 145 | /* okay, either we have other keys signing the current one, |
| 146 | * or the current |
| 147 | * one should have a DS record in the parent zone. |
| 148 | * How do we find this out? Try both? |
| 149 | * |
| 150 | * request DNSKEYS for current zone, |
| 151 | * add all signatures to current level |
| 152 | */ |
| 153 | ldns_pkt *my_pkt; |
| 154 | ldns_rr_list *signatures2; |
| 155 | |
| 156 | new_chain->parent_type = 1; |
| 157 | |
| 158 | my_pkt = ldns_resolver_query(res, |
| 159 | key_name, |
| 160 | LDNS_RR_TYPE_DS, |
| 161 | c, |
| 162 | qflags); |
| 163 | dss = ldns_pkt_rr_list_by_name_and_type(my_pkt, |
| 164 | key_name, |
| 165 | LDNS_RR_TYPE_DS, |
| 166 | LDNS_SECTION_ANY_NOQUESTION |
| 167 | ); |
| 168 | if (dss) { |
| 169 | new_chain->parent = ldns_dnssec_build_data_chain(res, |
| 170 | qflags, |
| 171 | dss, |
| 172 | my_pkt, |
| 173 | NULL); |
| 174 | new_chain->parent->packet_qtype = LDNS_RR_TYPE_DS; |
| 175 | ldns_rr_list_deep_free(dss); |
| 176 | } |
| 177 | ldns_pkt_free(my_pkt); |
| 178 | |
| 179 | my_pkt = ldns_resolver_query(res, |
| 180 | key_name, |
| 181 | LDNS_RR_TYPE_DNSKEY, |
| 182 | c, |
| 183 | qflags); |
| 184 | signatures2 = ldns_pkt_rr_list_by_name_and_type(my_pkt, |
| 185 | key_name, |
| 186 | LDNS_RR_TYPE_RRSIG, |
| 187 | LDNS_SECTION_ANSWER); |
| 188 | if (signatures2) { |
| 189 | if (new_chain->signatures) { |
| 190 | printf("There were already sigs!\n"); |
| 191 | ldns_rr_list_deep_free(new_chain->signatures); |
| 192 | printf("replacing the old sigs\n"); |
| 193 | } |
| 194 | new_chain->signatures = signatures2; |
| 195 | } |
| 196 | ldns_pkt_free(my_pkt); |
| 197 | } |
| 198 | |
| 199 | ldns_dnssec_data_chain * |
| 200 | ldns_dnssec_build_data_chain_nokeyname(ldns_resolver *res, |
| 201 | uint16_t qflags, |
| 202 | ldns_rr *orig_rr, |
| 203 | const ldns_rr_list *rrset, |
| 204 | ldns_dnssec_data_chain *new_chain) |
| 205 | { |
| 206 | ldns_rdf *possible_parent_name; |
| 207 | ldns_pkt *my_pkt; |
| 208 | /* apparently we were not able to find a signing key, so |
| 209 | we assume the chain ends here |
| 210 | */ |
| 211 | /* try parents for auth denial of DS */ |
| 212 | if (orig_rr) { |
| 213 | possible_parent_name = ldns_rr_owner(orig_rr); |
| 214 | } else if (rrset && ldns_rr_list_rr_count(rrset) > 0) { |
| 215 | possible_parent_name = ldns_rr_owner(ldns_rr_list_rr(rrset, 0)); |
| 216 | } else { |
| 217 | /* no information to go on, give up */ |
| 218 | return new_chain; |
| 219 | } |
| 220 | |
| 221 | my_pkt = ldns_resolver_query(res, |
| 222 | possible_parent_name, |
| 223 | LDNS_RR_TYPE_DS, |
| 224 | LDNS_RR_CLASS_IN, |
| 225 | qflags); |
| 226 | |
| 227 | if (ldns_pkt_ancount(my_pkt) > 0) { |
| 228 | /* add error, no sigs but DS in parent */ |
| 229 | /*ldns_pkt_print(stdout, my_pkt);*/ |
| 230 | ldns_pkt_free(my_pkt); |
| 231 | } else { |
| 232 | /* are there signatures? */ |
| 233 | new_chain->parent = ldns_dnssec_build_data_chain(res, |
| 234 | qflags, |
| 235 | NULL, |
| 236 | my_pkt, |
| 237 | NULL); |
| 238 | |
| 239 | new_chain->parent->packet_qtype = LDNS_RR_TYPE_DS; |
| 240 | |
| 241 | } |
| 242 | return new_chain; |
| 243 | } |
| 244 | |
| 245 | |
| 246 | ldns_dnssec_data_chain * |
| 247 | ldns_dnssec_build_data_chain(ldns_resolver *res, |
| 248 | uint16_t qflags, |
| 249 | const ldns_rr_list *rrset, |
| 250 | const ldns_pkt *pkt, |
| 251 | ldns_rr *orig_rr) |
| 252 | { |
| 253 | ldns_rr_list *signatures = NULL; |
| 254 | ldns_rr_list *dss = NULL; |
| 255 | |
| 256 | ldns_rr_list *my_rrset; |
| 257 | |
| 258 | ldns_pkt *my_pkt; |
| 259 | |
| 260 | ldns_rdf *name = NULL, *key_name = NULL; |
| 261 | ldns_rr_type type = 0; |
| 262 | ldns_rr_class c = 0; |
| 263 | |
| 264 | bool other_rrset = false; |
| 265 | |
| 266 | ldns_dnssec_data_chain *new_chain = ldns_dnssec_data_chain_new(); |
| 267 | |
| 268 | if (!ldns_dnssec_pkt_has_rrsigs(pkt)) { |
| 269 | /* hmm. no dnssec data in the packet. go up to try and deny |
| 270 | * DS? */ |
| 271 | return new_chain; |
| 272 | } |
| 273 | |
| 274 | if (orig_rr) { |
| 275 | new_chain->rrset = ldns_rr_list_new(); |
| 276 | ldns_rr_list_push_rr(new_chain->rrset, orig_rr); |
| 277 | new_chain->parent = ldns_dnssec_build_data_chain(res, |
| 278 | qflags, |
| 279 | rrset, |
| 280 | pkt, |
| 281 | NULL); |
| 282 | new_chain->packet_rcode = ldns_pkt_get_rcode(pkt); |
| 283 | new_chain->packet_qtype = ldns_rr_get_type(orig_rr); |
| 284 | if (ldns_pkt_ancount(pkt) == 0) { |
| 285 | new_chain->packet_nodata = true; |
| 286 | } |
| 287 | return new_chain; |
| 288 | } |
| 289 | |
| 290 | if (!rrset || ldns_rr_list_rr_count(rrset) < 1) { |
| 291 | /* hmm, no data, do we have denial? only works if pkt was given, |
| 292 | otherwise caller has to do the check himself */ |
| 293 | new_chain->packet_nodata = true; |
| 294 | if (pkt) { |
| 295 | my_rrset = ldns_pkt_rr_list_by_type(pkt, |
| 296 | LDNS_RR_TYPE_NSEC, |
| 297 | LDNS_SECTION_ANY_NOQUESTION |
| 298 | ); |
| 299 | if (my_rrset) { |
| 300 | if (ldns_rr_list_rr_count(my_rrset) > 0) { |
| 301 | type = LDNS_RR_TYPE_NSEC; |
| 302 | other_rrset = true; |
| 303 | } else { |
| 304 | ldns_rr_list_deep_free(my_rrset); |
| 305 | my_rrset = NULL; |
| 306 | } |
| 307 | } else { |
| 308 | /* nothing, try nsec3 */ |
| 309 | my_rrset = ldns_pkt_rr_list_by_type(pkt, |
| 310 | LDNS_RR_TYPE_NSEC3, |
| 311 | LDNS_SECTION_ANY_NOQUESTION); |
| 312 | if (my_rrset) { |
| 313 | if (ldns_rr_list_rr_count(my_rrset) > 0) { |
| 314 | type = LDNS_RR_TYPE_NSEC3; |
| 315 | other_rrset = true; |
| 316 | } else { |
| 317 | ldns_rr_list_deep_free(my_rrset); |
| 318 | my_rrset = NULL; |
| 319 | } |
| 320 | } else { |
| 321 | /* nothing, stop */ |
| 322 | /* try parent zone? for denied insecure? */ |
| 323 | return new_chain; |
| 324 | } |
| 325 | } |
| 326 | } else { |
| 327 | return new_chain; |
| 328 | } |
| 329 | } else { |
| 330 | my_rrset = (ldns_rr_list *) rrset; |
| 331 | } |
| 332 | |
| 333 | if (my_rrset && ldns_rr_list_rr_count(my_rrset) > 0) { |
| 334 | new_chain->rrset = ldns_rr_list_clone(my_rrset); |
| 335 | name = ldns_rr_owner(ldns_rr_list_rr(my_rrset, 0)); |
| 336 | type = ldns_rr_get_type(ldns_rr_list_rr(my_rrset, 0)); |
| 337 | c = ldns_rr_get_class(ldns_rr_list_rr(my_rrset, 0)); |
| 338 | } |
| 339 | |
| 340 | if (other_rrset) { |
| 341 | ldns_rr_list_deep_free(my_rrset); |
| 342 | } |
| 343 | |
| 344 | /* normally there will only be 1 signature 'set' |
| 345 | but there can be more than 1 denial (wildcards) |
| 346 | so check for NSEC |
| 347 | */ |
| 348 | if (type == LDNS_RR_TYPE_NSEC || type == LDNS_RR_TYPE_NSEC3) { |
| 349 | /* just throw in all signatures, the tree builder must sort |
| 350 | this out */ |
| 351 | if (pkt) { |
| 352 | signatures = ldns_dnssec_pkt_get_rrsigs_for_type(pkt, type); |
| 353 | } else { |
| 354 | my_pkt = ldns_resolver_query(res, name, type, c, qflags); |
| 355 | signatures = ldns_dnssec_pkt_get_rrsigs_for_type(pkt, type); |
| 356 | ldns_pkt_free(my_pkt); |
| 357 | } |
| 358 | } else { |
| 359 | if (pkt) { |
| 360 | signatures = |
| 361 | ldns_dnssec_pkt_get_rrsigs_for_name_and_type(pkt, |
| 362 | name, |
| 363 | type); |
| 364 | } |
| 365 | if (!signatures) { |
| 366 | my_pkt = ldns_resolver_query(res, name, type, c, qflags); |
| 367 | signatures = |
| 368 | ldns_dnssec_pkt_get_rrsigs_for_name_and_type(my_pkt, |
| 369 | name, |
| 370 | type); |
| 371 | ldns_pkt_free(my_pkt); |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | if (signatures && ldns_rr_list_rr_count(signatures) > 0) { |
| 376 | key_name = ldns_rr_rdf(ldns_rr_list_rr(signatures, 0), 7); |
| 377 | } |
| 378 | |
| 379 | if (!key_name) { |
| 380 | return ldns_dnssec_build_data_chain_nokeyname(res, |
| 381 | qflags, |
| 382 | orig_rr, |
| 383 | rrset, |
| 384 | new_chain); |
| 385 | } |
| 386 | |
| 387 | if (type != LDNS_RR_TYPE_DNSKEY) { |
| 388 | ldns_dnssec_build_data_chain_dnskey(res, |
| 389 | qflags, |
| 390 | pkt, |
| 391 | signatures, |
| 392 | new_chain, |
| 393 | key_name, |
| 394 | c |
| 395 | ); |
| 396 | } else { |
| 397 | ldns_dnssec_build_data_chain_other(res, |
| 398 | qflags, |
| 399 | new_chain, |
| 400 | key_name, |
| 401 | c, |
| 402 | dss |
| 403 | |
| 404 | ); |
| 405 | } |
| 406 | if (signatures) { |
| 407 | ldns_rr_list_deep_free(signatures); |
| 408 | } |
| 409 | |
| 410 | return new_chain; |
| 411 | } |
| 412 | |
| 413 | ldns_dnssec_trust_tree * |
| 414 | ldns_dnssec_trust_tree_new() |
| 415 | { |
| 416 | ldns_dnssec_trust_tree *new_tree = LDNS_XMALLOC(ldns_dnssec_trust_tree, |
| 417 | 1); |
| 418 | new_tree->rr = NULL; |
| 419 | new_tree->rrset = NULL; |
| 420 | new_tree->parent_count = 0; |
| 421 | |
| 422 | return new_tree; |
| 423 | } |
| 424 | |
| 425 | void |
| 426 | ldns_dnssec_trust_tree_free(ldns_dnssec_trust_tree *tree) |
| 427 | { |
| 428 | size_t i; |
| 429 | if (tree) { |
| 430 | for (i = 0; i < tree->parent_count; i++) { |
| 431 | ldns_dnssec_trust_tree_free(tree->parents[i]); |
| 432 | } |
| 433 | } |
| 434 | LDNS_FREE(tree); |
| 435 | } |
| 436 | |
| 437 | size_t |
| 438 | ldns_dnssec_trust_tree_depth(ldns_dnssec_trust_tree *tree) |
| 439 | { |
| 440 | size_t result = 0; |
| 441 | size_t parent = 0; |
| 442 | size_t i; |
| 443 | |
| 444 | for (i = 0; i < tree->parent_count; i++) { |
| 445 | parent = ldns_dnssec_trust_tree_depth(tree->parents[i]); |
| 446 | if (parent > result) { |
| 447 | result = parent; |
| 448 | } |
| 449 | } |
| 450 | return 1 + result; |
| 451 | } |
| 452 | |
| 453 | /* TODO ldns_ */ |
| 454 | static void |
| 455 | print_tabs(FILE *out, size_t nr, uint8_t *map, size_t treedepth) |
| 456 | { |
| 457 | size_t i; |
| 458 | for (i = 0; i < nr; i++) { |
| 459 | if (i == nr - 1) { |
| 460 | fprintf(out, "|---"); |
| 461 | } else if (map && i < treedepth && map[i] == 1) { |
| 462 | fprintf(out, "| "); |
| 463 | } else { |
| 464 | fprintf(out, " "); |
| 465 | } |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | void |
| 470 | ldns_dnssec_trust_tree_print_sm(FILE *out, |
| 471 | ldns_dnssec_trust_tree *tree, |
| 472 | size_t tabs, |
| 473 | bool extended, |
| 474 | uint8_t *sibmap, |
| 475 | size_t treedepth) |
| 476 | { |
| 477 | size_t i; |
| 478 | const ldns_rr_descriptor *descriptor; |
| 479 | bool mapset = false; |
| 480 | |
| 481 | if (!sibmap) { |
| 482 | treedepth = ldns_dnssec_trust_tree_depth(tree); |
| 483 | sibmap = malloc(treedepth); |
| 484 | memset(sibmap, 0, treedepth); |
| 485 | mapset = true; |
| 486 | } |
| 487 | |
| 488 | if (tree) { |
| 489 | if (tree->rr) { |
| 490 | print_tabs(out, tabs, sibmap, treedepth); |
| 491 | ldns_rdf_print(out, ldns_rr_owner(tree->rr)); |
| 492 | descriptor = ldns_rr_descript(ldns_rr_get_type(tree->rr)); |
| 493 | |
| 494 | if (descriptor->_name) { |
| 495 | fprintf(out, " (%s", descriptor->_name); |
| 496 | } else { |
| 497 | fprintf(out, " (TYPE%d", |
| 498 | ldns_rr_get_type(tree->rr)); |
| 499 | } |
| 500 | if (tabs > 0) { |
| 501 | if (ldns_rr_get_type(tree->rr) == LDNS_RR_TYPE_DNSKEY) { |
| 502 | fprintf(out, " keytag: %u", |
| 503 | (unsigned int) ldns_calc_keytag(tree->rr)); |
| 504 | fprintf(out, " alg: "); |
| 505 | ldns_rdf_print(out, ldns_rr_rdf(tree->rr, 2)); |
| 506 | fprintf(out, " flags: "); |
| 507 | ldns_rdf_print(out, ldns_rr_rdf(tree->rr, 0)); |
| 508 | } else if (ldns_rr_get_type(tree->rr) == LDNS_RR_TYPE_DS) { |
| 509 | fprintf(out, " keytag: "); |
| 510 | ldns_rdf_print(out, ldns_rr_rdf(tree->rr, 0)); |
| 511 | fprintf(out, " digest type: "); |
| 512 | ldns_rdf_print(out, ldns_rr_rdf(tree->rr, 2)); |
| 513 | } |
| 514 | if (ldns_rr_get_type(tree->rr) == LDNS_RR_TYPE_NSEC) { |
| 515 | fprintf(out, " "); |
| 516 | ldns_rdf_print(out, ldns_rr_rdf(tree->rr, 0)); |
| 517 | fprintf(out, " "); |
| 518 | ldns_rdf_print(out, ldns_rr_rdf(tree->rr, 1)); |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | fprintf(out, ")\n"); |
| 523 | for (i = 0; i < tree->parent_count; i++) { |
| 524 | if (tree->parent_count > 1 && i < tree->parent_count - 1) { |
| 525 | sibmap[tabs] = 1; |
| 526 | } else { |
| 527 | sibmap[tabs] = 0; |
| 528 | } |
| 529 | /* only print errors */ |
| 530 | if (ldns_rr_get_type(tree->parents[i]->rr) == |
| 531 | LDNS_RR_TYPE_NSEC || |
| 532 | ldns_rr_get_type(tree->parents[i]->rr) == |
| 533 | LDNS_RR_TYPE_NSEC3) { |
| 534 | if (tree->parent_status[i] == LDNS_STATUS_OK) { |
| 535 | print_tabs(out, tabs + 1, sibmap, treedepth); |
| 536 | if (tabs == 0 && |
| 537 | ldns_rr_get_type(tree->rr) == LDNS_RR_TYPE_NS && |
| 538 | ldns_rr_rd_count(tree->rr) > 0) { |
| 539 | fprintf(out, "Existence of DS is denied by:\n"); |
| 540 | } else { |
| 541 | fprintf(out, "Existence is denied by:\n"); |
| 542 | } |
| 543 | } else { |
| 544 | /* NS records aren't signed */ |
| 545 | if (ldns_rr_get_type(tree->rr) == LDNS_RR_TYPE_NS) { |
| 546 | fprintf(out, "Existence of DS is denied by:\n"); |
| 547 | } else { |
| 548 | print_tabs(out, tabs + 1, sibmap, treedepth); |
| 549 | fprintf(out, |
| 550 | "Error in denial of existence: %s\n", |
| 551 | ldns_get_errorstr_by_id( |
| 552 | tree->parent_status[i])); |
| 553 | } |
| 554 | } |
| 555 | } else |
| 556 | if (tree->parent_status[i] != LDNS_STATUS_OK) { |
| 557 | print_tabs(out, tabs + 1, sibmap, treedepth); |
| 558 | fprintf(out, |
| 559 | "%s:\n", |
| 560 | ldns_get_errorstr_by_id( |
| 561 | tree->parent_status[i])); |
| 562 | if (tree->parent_status[i] |
| 563 | == LDNS_STATUS_SSL_ERR) { |
| 564 | printf("; SSL Error: "); |
| 565 | ERR_load_crypto_strings(); |
| 566 | ERR_print_errors_fp(stdout); |
| 567 | printf("\n"); |
| 568 | } |
| 569 | ldns_rr_print(out, tree->parent_signature[i]); |
| 570 | printf("For RRset:\n"); |
| 571 | ldns_rr_list_print(out, tree->rrset); |
| 572 | printf("With key:\n"); |
| 573 | ldns_rr_print(out, tree->parents[i]->rr); |
| 574 | } |
| 575 | ldns_dnssec_trust_tree_print_sm(out, |
| 576 | tree->parents[i], |
| 577 | tabs+1, |
| 578 | extended, |
| 579 | sibmap, |
| 580 | treedepth); |
| 581 | } |
| 582 | } else { |
| 583 | print_tabs(out, tabs, sibmap, treedepth); |
| 584 | fprintf(out, "<no data>\n"); |
| 585 | } |
| 586 | } else { |
| 587 | fprintf(out, "<null pointer>\n"); |
| 588 | } |
| 589 | |
| 590 | if (mapset) { |
| 591 | free(sibmap); |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | void |
| 596 | ldns_dnssec_trust_tree_print(FILE *out, |
| 597 | ldns_dnssec_trust_tree *tree, |
| 598 | size_t tabs, |
| 599 | bool extended) |
| 600 | { |
| 601 | ldns_dnssec_trust_tree_print_sm(out, tree, tabs, extended, NULL, 0); |
| 602 | } |
| 603 | |
| 604 | ldns_status |
| 605 | ldns_dnssec_trust_tree_add_parent(ldns_dnssec_trust_tree *tree, |
| 606 | const ldns_dnssec_trust_tree *parent, |
| 607 | const ldns_rr *signature, |
| 608 | const ldns_status parent_status) |
| 609 | { |
| 610 | if (tree |
| 611 | && parent |
| 612 | && tree->parent_count < LDNS_DNSSEC_TRUST_TREE_MAX_PARENTS) { |
| 613 | /* |
| 614 | printf("Add parent for: "); |
| 615 | ldns_rr_print(stdout, tree->rr); |
| 616 | printf("parent: "); |
| 617 | ldns_rr_print(stdout, parent->rr); |
| 618 | */ |
| 619 | tree->parents[tree->parent_count] = |
| 620 | (ldns_dnssec_trust_tree *) parent; |
| 621 | tree->parent_status[tree->parent_count] = parent_status; |
| 622 | tree->parent_signature[tree->parent_count] = (ldns_rr *) signature; |
| 623 | tree->parent_count++; |
| 624 | return LDNS_STATUS_OK; |
| 625 | } else { |
| 626 | return LDNS_STATUS_ERR; |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | /* if rr is null, take the first from the rrset */ |
| 631 | ldns_dnssec_trust_tree * |
| 632 | ldns_dnssec_derive_trust_tree(ldns_dnssec_data_chain *data_chain, ldns_rr *rr) |
| 633 | { |
| 634 | ldns_rr_list *cur_rrset; |
| 635 | ldns_rr_list *cur_sigs; |
| 636 | ldns_rr *cur_rr = NULL; |
| 637 | ldns_rr *cur_sig_rr; |
| 638 | size_t i, j; |
| 639 | |
| 640 | ldns_dnssec_trust_tree *new_tree = ldns_dnssec_trust_tree_new(); |
| 641 | |
| 642 | if (data_chain && data_chain->rrset) { |
| 643 | cur_rrset = data_chain->rrset; |
| 644 | |
| 645 | cur_sigs = data_chain->signatures; |
| 646 | |
| 647 | if (rr) { |
| 648 | cur_rr = rr; |
| 649 | } |
| 650 | |
| 651 | if (!cur_rr && ldns_rr_list_rr_count(cur_rrset) > 0) { |
| 652 | cur_rr = ldns_rr_list_rr(cur_rrset, 0); |
| 653 | } |
| 654 | |
| 655 | if (cur_rr) { |
| 656 | new_tree->rr = cur_rr; |
| 657 | new_tree->rrset = cur_rrset; |
| 658 | /* there are three possibilities: |
| 659 | 1 - 'normal' rrset, signed by a key |
| 660 | 2 - dnskey signed by other dnskey |
| 661 | 3 - dnskey proven by higher level DS |
| 662 | (data denied by nsec is a special case that can |
| 663 | occur in multiple places) |
| 664 | |
| 665 | */ |
| 666 | if (cur_sigs) { |
| 667 | for (i = 0; i < ldns_rr_list_rr_count(cur_sigs); i++) { |
| 668 | /* find the appropriate key in the parent list */ |
| 669 | cur_sig_rr = ldns_rr_list_rr(cur_sigs, i); |
| 670 | |
| 671 | if (ldns_rr_get_type(cur_rr) == LDNS_RR_TYPE_NSEC) { |
| 672 | if (ldns_dname_compare(ldns_rr_owner(cur_sig_rr), |
| 673 | ldns_rr_owner(cur_rr))) |
| 674 | { |
| 675 | /* find first that does match */ |
| 676 | |
| 677 | for (j = 0; |
| 678 | j < ldns_rr_list_rr_count(cur_rrset) && |
| 679 | ldns_dname_compare(ldns_rr_owner(cur_sig_rr),ldns_rr_owner(cur_rr)) != 0; |
| 680 | j++) { |
| 681 | cur_rr = ldns_rr_list_rr(cur_rrset, j); |
| 682 | |
| 683 | } |
| 684 | if (ldns_dname_compare(ldns_rr_owner(cur_sig_rr), |
| 685 | ldns_rr_owner(cur_rr))) |
| 686 | { |
| 687 | break; |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | } |
| 692 | /* option 1 */ |
| 693 | if (data_chain->parent) { |
| 694 | ldns_dnssec_derive_trust_tree_normal_rrset( |
| 695 | new_tree, |
| 696 | data_chain, |
| 697 | cur_sig_rr); |
| 698 | } |
| 699 | |
| 700 | /* option 2 */ |
| 701 | ldns_dnssec_derive_trust_tree_dnskey_rrset( |
| 702 | new_tree, |
| 703 | data_chain, |
| 704 | cur_rr, |
| 705 | cur_sig_rr); |
| 706 | } |
| 707 | |
| 708 | ldns_dnssec_derive_trust_tree_ds_rrset(new_tree, |
| 709 | data_chain, |
| 710 | cur_rr); |
| 711 | } else { |
| 712 | /* no signatures? maybe it's nsec data */ |
| 713 | |
| 714 | /* just add every rr from parent as new parent */ |
| 715 | ldns_dnssec_derive_trust_tree_no_sig(new_tree, data_chain); |
| 716 | } |
| 717 | } |
| 718 | } |
| 719 | |
| 720 | return new_tree; |
| 721 | } |
| 722 | |
| 723 | void |
| 724 | ldns_dnssec_derive_trust_tree_normal_rrset(ldns_dnssec_trust_tree *new_tree, |
| 725 | ldns_dnssec_data_chain *data_chain, |
| 726 | ldns_rr *cur_sig_rr) |
| 727 | { |
| 728 | size_t i, j; |
| 729 | ldns_rr_list *cur_rrset = ldns_rr_list_clone(data_chain->rrset); |
| 730 | ldns_dnssec_trust_tree *cur_parent_tree; |
| 731 | ldns_rr *cur_parent_rr; |
| 732 | uint16_t cur_keytag; |
| 733 | ldns_rr_list *tmp_rrset = NULL; |
| 734 | ldns_status cur_status; |
| 735 | |
| 736 | cur_keytag = ldns_rdf2native_int16(ldns_rr_rrsig_keytag(cur_sig_rr)); |
| 737 | |
| 738 | for (j = 0; j < ldns_rr_list_rr_count(data_chain->parent->rrset); j++) { |
| 739 | cur_parent_rr = ldns_rr_list_rr(data_chain->parent->rrset, j); |
| 740 | if (ldns_rr_get_type(cur_parent_rr) == LDNS_RR_TYPE_DNSKEY) { |
| 741 | if (ldns_calc_keytag(cur_parent_rr) == cur_keytag) { |
| 742 | |
| 743 | /* TODO: check wildcard nsec too */ |
| 744 | if (cur_rrset && ldns_rr_list_rr_count(cur_rrset) > 0) { |
| 745 | tmp_rrset = cur_rrset; |
| 746 | if (ldns_rr_get_type(ldns_rr_list_rr(cur_rrset, 0)) |
| 747 | == LDNS_RR_TYPE_NSEC || |
| 748 | ldns_rr_get_type(ldns_rr_list_rr(cur_rrset, 0)) |
| 749 | == LDNS_RR_TYPE_NSEC3) { |
| 750 | /* might contain different names! |
| 751 | sort and split */ |
| 752 | ldns_rr_list_sort(cur_rrset); |
| 753 | if (tmp_rrset && tmp_rrset != cur_rrset) { |
| 754 | ldns_rr_list_deep_free(tmp_rrset); |
| 755 | tmp_rrset = NULL; |
| 756 | } |
| 757 | tmp_rrset = ldns_rr_list_pop_rrset(cur_rrset); |
| 758 | |
| 759 | /* with nsecs, this might be the wrong one */ |
| 760 | while (tmp_rrset && |
| 761 | ldns_rr_list_rr_count(cur_rrset) > 0 && |
| 762 | ldns_dname_compare( |
| 763 | ldns_rr_owner(ldns_rr_list_rr( |
| 764 | tmp_rrset, 0)), |
| 765 | ldns_rr_owner(cur_sig_rr)) != 0) { |
| 766 | ldns_rr_list_deep_free(tmp_rrset); |
| 767 | tmp_rrset = |
| 768 | ldns_rr_list_pop_rrset(cur_rrset); |
| 769 | } |
| 770 | } |
| 771 | cur_status = ldns_verify_rrsig(tmp_rrset, |
| 772 | cur_sig_rr, |
| 773 | cur_parent_rr); |
| 774 | /* avoid dupes */ |
| 775 | for (i = 0; i < new_tree->parent_count; i++) { |
| 776 | if (cur_parent_rr == new_tree->parents[i]->rr) { |
| 777 | goto done; |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | cur_parent_tree = |
| 782 | ldns_dnssec_derive_trust_tree(data_chain->parent, |
| 783 | cur_parent_rr); |
| 784 | (void)ldns_dnssec_trust_tree_add_parent(new_tree, |
| 785 | cur_parent_tree, |
| 786 | cur_sig_rr, |
| 787 | cur_status); |
| 788 | } |
| 789 | } |
| 790 | } |
| 791 | } |
| 792 | done: |
| 793 | if (tmp_rrset && tmp_rrset != cur_rrset) { |
| 794 | ldns_rr_list_deep_free(tmp_rrset); |
| 795 | } |
| 796 | ldns_rr_list_deep_free(cur_rrset); |
| 797 | } |
| 798 | |
| 799 | void |
| 800 | ldns_dnssec_derive_trust_tree_dnskey_rrset(ldns_dnssec_trust_tree *new_tree, |
| 801 | ldns_dnssec_data_chain *data_chain, |
| 802 | ldns_rr *cur_rr, |
| 803 | ldns_rr *cur_sig_rr) |
| 804 | { |
| 805 | size_t j; |
| 806 | ldns_rr_list *cur_rrset = data_chain->rrset; |
| 807 | ldns_dnssec_trust_tree *cur_parent_tree; |
| 808 | ldns_rr *cur_parent_rr; |
| 809 | uint16_t cur_keytag; |
| 810 | ldns_status cur_status; |
| 811 | |
| 812 | cur_keytag = ldns_rdf2native_int16(ldns_rr_rrsig_keytag(cur_sig_rr)); |
| 813 | |
| 814 | for (j = 0; j < ldns_rr_list_rr_count(cur_rrset); j++) { |
| 815 | cur_parent_rr = ldns_rr_list_rr(cur_rrset, j); |
| 816 | if (cur_parent_rr != cur_rr && |
| 817 | ldns_rr_get_type(cur_parent_rr) == LDNS_RR_TYPE_DNSKEY) { |
| 818 | if (ldns_calc_keytag(cur_parent_rr) == cur_keytag |
| 819 | ) { |
| 820 | cur_parent_tree = ldns_dnssec_trust_tree_new(); |
| 821 | cur_parent_tree->rr = cur_parent_rr; |
| 822 | cur_parent_tree->rrset = cur_rrset; |
| 823 | cur_status = ldns_verify_rrsig(cur_rrset, |
| 824 | cur_sig_rr, |
| 825 | cur_parent_rr); |
| 826 | (void) ldns_dnssec_trust_tree_add_parent(new_tree, |
| 827 | cur_parent_tree, cur_sig_rr, cur_status); |
| 828 | } |
| 829 | } |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | void |
| 834 | ldns_dnssec_derive_trust_tree_ds_rrset(ldns_dnssec_trust_tree *new_tree, |
| 835 | ldns_dnssec_data_chain *data_chain, |
| 836 | ldns_rr *cur_rr) |
| 837 | { |
| 838 | size_t j, h; |
| 839 | ldns_rr_list *cur_rrset = data_chain->rrset; |
| 840 | ldns_dnssec_trust_tree *cur_parent_tree; |
| 841 | ldns_rr *cur_parent_rr; |
| 842 | |
| 843 | /* try the parent to see whether there are DSs there */ |
| 844 | if (ldns_rr_get_type(cur_rr) == LDNS_RR_TYPE_DNSKEY && |
| 845 | data_chain->parent && |
| 846 | data_chain->parent->rrset |
| 847 | ) { |
| 848 | for (j = 0; |
| 849 | j < ldns_rr_list_rr_count(data_chain->parent->rrset); |
| 850 | j++) { |
| 851 | cur_parent_rr = ldns_rr_list_rr(data_chain->parent->rrset, j); |
| 852 | if (ldns_rr_get_type(cur_parent_rr) == LDNS_RR_TYPE_DS) { |
| 853 | for (h = 0; h < ldns_rr_list_rr_count(cur_rrset); h++) { |
| 854 | cur_rr = ldns_rr_list_rr(cur_rrset, h); |
| 855 | if (ldns_rr_compare_ds(cur_rr, cur_parent_rr)) { |
| 856 | cur_parent_tree = |
| 857 | ldns_dnssec_derive_trust_tree( |
| 858 | data_chain->parent, cur_parent_rr); |
| 859 | (void) ldns_dnssec_trust_tree_add_parent( |
| 860 | new_tree, |
| 861 | cur_parent_tree, |
| 862 | NULL, |
| 863 | LDNS_STATUS_OK); |
| 864 | } else { |
| 865 | /*ldns_rr_print(stdout, cur_parent_rr);*/ |
| 866 | } |
| 867 | } |
| 868 | } |
| 869 | } |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | void |
| 874 | ldns_dnssec_derive_trust_tree_no_sig(ldns_dnssec_trust_tree *new_tree, |
| 875 | ldns_dnssec_data_chain *data_chain) |
| 876 | { |
| 877 | size_t i; |
| 878 | ldns_rr_list *cur_rrset; |
| 879 | ldns_rr *cur_parent_rr; |
| 880 | ldns_dnssec_trust_tree *cur_parent_tree; |
| 881 | ldns_status result; |
| 882 | |
| 883 | if (data_chain->parent && data_chain->parent->rrset) { |
| 884 | cur_rrset = data_chain->parent->rrset; |
| 885 | /* nsec? */ |
| 886 | if (cur_rrset && ldns_rr_list_rr_count(cur_rrset) > 0) { |
| 887 | if (ldns_rr_get_type(ldns_rr_list_rr(cur_rrset, 0)) == |
| 888 | LDNS_RR_TYPE_NSEC3) { |
| 889 | result = ldns_dnssec_verify_denial_nsec3( |
| 890 | new_tree->rr, |
| 891 | cur_rrset, |
| 892 | data_chain->parent->signatures, |
| 893 | data_chain->packet_rcode, |
| 894 | data_chain->packet_qtype, |
| 895 | data_chain->packet_nodata); |
| 896 | } else if (ldns_rr_get_type(ldns_rr_list_rr(cur_rrset, 0)) == |
| 897 | LDNS_RR_TYPE_NSEC3) { |
| 898 | result = ldns_dnssec_verify_denial( |
| 899 | new_tree->rr, |
| 900 | cur_rrset, |
| 901 | data_chain->parent->signatures); |
| 902 | } else { |
| 903 | /* unsigned zone, unsigned parent */ |
| 904 | result = LDNS_STATUS_OK; |
| 905 | } |
| 906 | } else { |
| 907 | result = LDNS_STATUS_DNSSEC_NSEC_RR_NOT_COVERED; |
| 908 | } |
| 909 | for (i = 0; i < ldns_rr_list_rr_count(cur_rrset); i++) { |
| 910 | cur_parent_rr = ldns_rr_list_rr(cur_rrset, i); |
| 911 | cur_parent_tree = |
| 912 | ldns_dnssec_derive_trust_tree(data_chain->parent, |
| 913 | cur_parent_rr); |
| 914 | (void) ldns_dnssec_trust_tree_add_parent(new_tree, |
| 915 | cur_parent_tree, NULL, result); |
| 916 | } |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | /* |
| 921 | * returns OK if there is a path from tree to key with only OK |
| 922 | * the (first) error in between otherwise |
| 923 | * or NOT_FOUND if the key wasn't present at all |
| 924 | */ |
| 925 | ldns_status |
| 926 | ldns_dnssec_trust_tree_contains_keys(ldns_dnssec_trust_tree *tree, |
| 927 | ldns_rr_list *trusted_keys) |
| 928 | { |
| 929 | size_t i; |
| 930 | ldns_status result = LDNS_STATUS_CRYPTO_NO_DNSKEY; |
| 931 | bool equal; |
| 932 | ldns_status parent_result; |
| 933 | |
| 934 | if (tree && trusted_keys && ldns_rr_list_rr_count(trusted_keys) > 0) |
| 935 | { if (tree->rr) { |
| 936 | for (i = 0; i < ldns_rr_list_rr_count(trusted_keys); i++) { |
| 937 | equal = ldns_rr_compare_ds( |
| 938 | tree->rr, |
| 939 | ldns_rr_list_rr(trusted_keys, i)); |
| 940 | if (equal) { |
| 941 | result = LDNS_STATUS_OK; |
| 942 | return result; |
| 943 | } |
| 944 | } |
| 945 | } |
| 946 | for (i = 0; i < tree->parent_count; i++) { |
| 947 | parent_result = |
| 948 | ldns_dnssec_trust_tree_contains_keys(tree->parents[i], |
| 949 | trusted_keys); |
| 950 | if (parent_result != LDNS_STATUS_CRYPTO_NO_DNSKEY) { |
| 951 | if (tree->parent_status[i] != LDNS_STATUS_OK) { |
| 952 | result = tree->parent_status[i]; |
| 953 | } else { |
| 954 | if (ldns_rr_get_type(tree->rr) |
| 955 | == LDNS_RR_TYPE_NSEC && |
| 956 | parent_result == LDNS_STATUS_OK |
| 957 | ) { |
| 958 | result = |
| 959 | LDNS_STATUS_DNSSEC_EXISTENCE_DENIED; |
| 960 | } else { |
| 961 | result = parent_result; |
| 962 | } |
| 963 | } |
| 964 | } |
| 965 | } |
| 966 | } else { |
| 967 | result = LDNS_STATUS_ERR; |
| 968 | } |
| 969 | |
| 970 | return result; |
| 971 | } |
| 972 | |
| 973 | ldns_status |
| 974 | ldns_verify(ldns_rr_list *rrset, ldns_rr_list *rrsig, const ldns_rr_list *keys, |
| 975 | ldns_rr_list *good_keys) |
| 976 | { |
| 977 | uint16_t i; |
| 978 | ldns_status verify_result = LDNS_STATUS_ERR; |
| 979 | |
| 980 | if (!rrset || !rrsig || !keys) { |
| 981 | return LDNS_STATUS_ERR; |
| 982 | } |
| 983 | |
| 984 | if (ldns_rr_list_rr_count(rrset) < 1) { |
| 985 | return LDNS_STATUS_ERR; |
| 986 | } |
| 987 | |
| 988 | if (ldns_rr_list_rr_count(rrsig) < 1) { |
| 989 | return LDNS_STATUS_CRYPTO_NO_RRSIG; |
| 990 | } |
| 991 | |
| 992 | if (ldns_rr_list_rr_count(keys) < 1) { |
| 993 | verify_result = LDNS_STATUS_CRYPTO_NO_TRUSTED_DNSKEY; |
| 994 | } else { |
| 995 | for (i = 0; i < ldns_rr_list_rr_count(rrsig); i++) { |
| 996 | ldns_status s = ldns_verify_rrsig_keylist(rrset, |
| 997 | ldns_rr_list_rr(rrsig, i), keys, good_keys); |
| 998 | /* try a little to get more descriptive error */ |
| 999 | if(s == LDNS_STATUS_OK) { |
| 1000 | verify_result = LDNS_STATUS_OK; |
| 1001 | } else if(verify_result == LDNS_STATUS_ERR) |
| 1002 | verify_result = s; |
| 1003 | else if(s != LDNS_STATUS_ERR && verify_result == |
| 1004 | LDNS_STATUS_CRYPTO_NO_MATCHING_KEYTAG_DNSKEY) |
| 1005 | verify_result = s; |
| 1006 | } |
| 1007 | } |
| 1008 | return verify_result; |
| 1009 | } |
| 1010 | |
| 1011 | ldns_status |
| 1012 | ldns_verify_notime(ldns_rr_list *rrset, ldns_rr_list *rrsig, |
| 1013 | const ldns_rr_list *keys, ldns_rr_list *good_keys) |
| 1014 | { |
| 1015 | uint16_t i; |
| 1016 | ldns_status verify_result = LDNS_STATUS_ERR; |
| 1017 | |
| 1018 | if (!rrset || !rrsig || !keys) { |
| 1019 | return LDNS_STATUS_ERR; |
| 1020 | } |
| 1021 | |
| 1022 | if (ldns_rr_list_rr_count(rrset) < 1) { |
| 1023 | return LDNS_STATUS_ERR; |
| 1024 | } |
| 1025 | |
| 1026 | if (ldns_rr_list_rr_count(rrsig) < 1) { |
| 1027 | return LDNS_STATUS_CRYPTO_NO_RRSIG; |
| 1028 | } |
| 1029 | |
| 1030 | if (ldns_rr_list_rr_count(keys) < 1) { |
| 1031 | verify_result = LDNS_STATUS_CRYPTO_NO_TRUSTED_DNSKEY; |
| 1032 | } else { |
| 1033 | for (i = 0; i < ldns_rr_list_rr_count(rrsig); i++) { |
| 1034 | ldns_status s = ldns_verify_rrsig_keylist_notime(rrset, |
| 1035 | ldns_rr_list_rr(rrsig, i), keys, good_keys); |
| 1036 | |
| 1037 | /* try a little to get more descriptive error */ |
| 1038 | if (s == LDNS_STATUS_OK) { |
| 1039 | verify_result = LDNS_STATUS_OK; |
| 1040 | } else if (verify_result == LDNS_STATUS_ERR) { |
| 1041 | verify_result = s; |
| 1042 | } else if (s != LDNS_STATUS_ERR && verify_result == |
| 1043 | LDNS_STATUS_CRYPTO_NO_MATCHING_KEYTAG_DNSKEY) { |
| 1044 | verify_result = s; |
| 1045 | } |
| 1046 | } |
| 1047 | } |
| 1048 | return verify_result; |
| 1049 | } |
| 1050 | |
| 1051 | ldns_rr_list * |
| 1052 | ldns_fetch_valid_domain_keys(const ldns_resolver *res, |
| 1053 | const ldns_rdf *domain, |
| 1054 | const ldns_rr_list *keys, |
| 1055 | ldns_status *status) |
| 1056 | { |
| 1057 | ldns_rr_list * trusted_keys = NULL; |
| 1058 | ldns_rr_list * ds_keys = NULL; |
| 1059 | |
| 1060 | if (res && domain && keys) { |
| 1061 | |
| 1062 | if ((trusted_keys = ldns_validate_domain_dnskey(res, |
| 1063 | domain, |
| 1064 | keys))) { |
| 1065 | *status = LDNS_STATUS_OK; |
| 1066 | } else { |
| 1067 | /* No trusted keys in this domain, we'll have to find some in the parent domain */ |
| 1068 | *status = LDNS_STATUS_CRYPTO_NO_TRUSTED_DNSKEY; |
| 1069 | |
| 1070 | if (ldns_rdf_size(domain) > 1) { |
| 1071 | /* Fail if we are at the root */ |
| 1072 | ldns_rr_list * parent_keys; |
| 1073 | ldns_rdf * parent_domain = ldns_dname_left_chop(domain); |
| 1074 | |
| 1075 | if ((parent_keys = |
| 1076 | ldns_fetch_valid_domain_keys(res, |
| 1077 | parent_domain, |
| 1078 | keys, |
| 1079 | status))) { |
| 1080 | /* Check DS records */ |
| 1081 | if ((ds_keys = |
| 1082 | ldns_validate_domain_ds(res, |
| 1083 | domain, |
| 1084 | parent_keys))) { |
| 1085 | trusted_keys = |
| 1086 | ldns_fetch_valid_domain_keys(res, |
| 1087 | domain, |
| 1088 | ds_keys, |
| 1089 | status); |
| 1090 | ldns_rr_list_deep_free(ds_keys); |
| 1091 | } else { |
| 1092 | /* No valid DS at the parent -- fail */ |
| 1093 | *status = LDNS_STATUS_CRYPTO_NO_TRUSTED_DS ; |
| 1094 | } |
| 1095 | ldns_rr_list_deep_free(parent_keys); |
| 1096 | } |
| 1097 | ldns_rdf_deep_free(parent_domain); |
| 1098 | } |
| 1099 | } |
| 1100 | } |
| 1101 | return trusted_keys; |
| 1102 | } |
| 1103 | |
| 1104 | ldns_rr_list * |
| 1105 | ldns_validate_domain_dnskey(const ldns_resolver * res, |
| 1106 | const ldns_rdf * domain, |
| 1107 | const ldns_rr_list * keys) |
| 1108 | { |
| 1109 | ldns_pkt * keypkt; |
| 1110 | ldns_rr * cur_key; |
| 1111 | uint16_t key_i; uint16_t key_j; uint16_t key_k; |
| 1112 | uint16_t sig_i; ldns_rr * cur_sig; |
| 1113 | |
| 1114 | ldns_rr_list * domain_keys = NULL; |
| 1115 | ldns_rr_list * domain_sigs = NULL; |
| 1116 | ldns_rr_list * trusted_keys = NULL; |
| 1117 | |
| 1118 | /* Fetch keys for the domain */ |
| 1119 | if ((keypkt = ldns_resolver_query(res, |
| 1120 | domain, |
| 1121 | LDNS_RR_TYPE_DNSKEY, |
| 1122 | LDNS_RR_CLASS_IN, |
| 1123 | LDNS_RD))) { |
| 1124 | |
| 1125 | domain_keys = ldns_pkt_rr_list_by_type(keypkt, |
| 1126 | LDNS_RR_TYPE_DNSKEY, |
| 1127 | LDNS_SECTION_ANSWER); |
| 1128 | domain_sigs = ldns_pkt_rr_list_by_type(keypkt, |
| 1129 | LDNS_RR_TYPE_RRSIG, |
| 1130 | LDNS_SECTION_ANSWER); |
| 1131 | |
| 1132 | /* Try to validate the record using our keys */ |
| 1133 | for (key_i=0; key_i< ldns_rr_list_rr_count(domain_keys); key_i++) { |
| 1134 | |
| 1135 | cur_key = ldns_rr_list_rr(domain_keys, key_i); |
| 1136 | for (key_j=0; key_j<ldns_rr_list_rr_count(keys); key_j++) { |
| 1137 | if (ldns_rr_compare_ds(ldns_rr_list_rr(keys, key_j), |
| 1138 | cur_key)) { |
| 1139 | |
| 1140 | /* Current key is trusted -- validate */ |
| 1141 | trusted_keys = ldns_rr_list_new(); |
| 1142 | |
| 1143 | for (sig_i=0; |
| 1144 | sig_i<ldns_rr_list_rr_count(domain_sigs); |
| 1145 | sig_i++) { |
| 1146 | cur_sig = ldns_rr_list_rr(domain_sigs, sig_i); |
| 1147 | /* Avoid non-matching sigs */ |
| 1148 | if (ldns_rdf2native_int16( |
| 1149 | ldns_rr_rrsig_keytag(cur_sig)) |
| 1150 | == ldns_calc_keytag(cur_key)) { |
| 1151 | if (ldns_verify_rrsig(domain_keys, |
| 1152 | cur_sig, |
| 1153 | cur_key) |
| 1154 | == LDNS_STATUS_OK) { |
| 1155 | |
| 1156 | /* Push the whole rrset |
| 1157 | -- we can't do much more */ |
| 1158 | for (key_k=0; |
| 1159 | key_k<ldns_rr_list_rr_count( |
| 1160 | domain_keys); |
| 1161 | key_k++) { |
| 1162 | ldns_rr_list_push_rr( |
| 1163 | trusted_keys, |
| 1164 | ldns_rr_clone( |
| 1165 | ldns_rr_list_rr( |
| 1166 | domain_keys, |
| 1167 | key_k))); |
| 1168 | } |
| 1169 | |
| 1170 | ldns_rr_list_deep_free(domain_keys); |
| 1171 | ldns_rr_list_deep_free(domain_sigs); |
| 1172 | ldns_pkt_free(keypkt); |
| 1173 | return trusted_keys; |
| 1174 | } |
| 1175 | } |
| 1176 | } |
| 1177 | |
| 1178 | /* Only push our trusted key */ |
| 1179 | ldns_rr_list_push_rr(trusted_keys, |
| 1180 | ldns_rr_clone(cur_key)); |
| 1181 | } |
| 1182 | } |
| 1183 | } |
| 1184 | |
| 1185 | ldns_rr_list_deep_free(domain_keys); |
| 1186 | ldns_rr_list_deep_free(domain_sigs); |
| 1187 | ldns_pkt_free(keypkt); |
| 1188 | |
| 1189 | } else { |
| 1190 | /* LDNS_STATUS_CRYPTO_NO_DNSKEY */ |
| 1191 | } |
| 1192 | |
| 1193 | return trusted_keys; |
| 1194 | } |
| 1195 | |
| 1196 | ldns_rr_list * |
| 1197 | ldns_validate_domain_ds(const ldns_resolver *res, |
| 1198 | const ldns_rdf * domain, |
| 1199 | const ldns_rr_list * keys) |
| 1200 | { |
| 1201 | ldns_pkt * dspkt; |
| 1202 | uint16_t key_i; |
| 1203 | ldns_rr_list * rrset = NULL; |
| 1204 | ldns_rr_list * sigs = NULL; |
| 1205 | ldns_rr_list * trusted_keys = NULL; |
| 1206 | |
| 1207 | /* Fetch DS for the domain */ |
| 1208 | if ((dspkt = ldns_resolver_query(res, |
| 1209 | domain, |
| 1210 | LDNS_RR_TYPE_DS, |
| 1211 | LDNS_RR_CLASS_IN, |
| 1212 | LDNS_RD))) { |
| 1213 | |
| 1214 | rrset = ldns_pkt_rr_list_by_type(dspkt, |
| 1215 | LDNS_RR_TYPE_DS, |
| 1216 | LDNS_SECTION_ANSWER); |
| 1217 | sigs = ldns_pkt_rr_list_by_type(dspkt, |
| 1218 | LDNS_RR_TYPE_RRSIG, |
| 1219 | LDNS_SECTION_ANSWER); |
| 1220 | |
| 1221 | /* Validate sigs */ |
| 1222 | if (ldns_verify(rrset, sigs, keys, NULL) == LDNS_STATUS_OK) { |
| 1223 | trusted_keys = ldns_rr_list_new(); |
| 1224 | for (key_i=0; key_i<ldns_rr_list_rr_count(rrset); key_i++) { |
| 1225 | ldns_rr_list_push_rr(trusted_keys, |
| 1226 | ldns_rr_clone(ldns_rr_list_rr(rrset, |
| 1227 | key_i) |
| 1228 | ) |
| 1229 | ); |
| 1230 | } |
| 1231 | } |
| 1232 | |
| 1233 | ldns_rr_list_deep_free(rrset); |
| 1234 | ldns_rr_list_deep_free(sigs); |
| 1235 | ldns_pkt_free(dspkt); |
| 1236 | |
| 1237 | } else { |
| 1238 | /* LDNS_STATUS_CRYPTO_NO_DS */ |
| 1239 | } |
| 1240 | |
| 1241 | return trusted_keys; |
| 1242 | } |
| 1243 | |
| 1244 | ldns_status |
| 1245 | ldns_verify_trusted(ldns_resolver *res, |
| 1246 | ldns_rr_list *rrset, |
| 1247 | ldns_rr_list * rrsigs, |
| 1248 | ldns_rr_list * validating_keys) |
| 1249 | { |
| 1250 | uint16_t sig_i; uint16_t key_i; |
| 1251 | ldns_rr * cur_sig; ldns_rr * cur_key; |
| 1252 | ldns_rr_list * trusted_keys = NULL; |
| 1253 | ldns_status result = LDNS_STATUS_ERR; |
| 1254 | |
| 1255 | if (!res || !rrset || !rrsigs) { |
| 1256 | return LDNS_STATUS_ERR; |
| 1257 | } |
| 1258 | |
| 1259 | if (ldns_rr_list_rr_count(rrset) < 1) { |
| 1260 | return LDNS_STATUS_ERR; |
| 1261 | } |
| 1262 | |
| 1263 | if (ldns_rr_list_rr_count(rrsigs) < 1) { |
| 1264 | return LDNS_STATUS_CRYPTO_NO_RRSIG; |
| 1265 | } |
| 1266 | |
| 1267 | /* Look at each sig */ |
| 1268 | for (sig_i=0; sig_i < ldns_rr_list_rr_count(rrsigs); sig_i++) { |
| 1269 | |
| 1270 | cur_sig = ldns_rr_list_rr(rrsigs, sig_i); |
| 1271 | /* Get a valid signer key and validate the sig */ |
| 1272 | if ((trusted_keys = ldns_fetch_valid_domain_keys( |
| 1273 | res, |
| 1274 | ldns_rr_rrsig_signame(cur_sig), |
| 1275 | ldns_resolver_dnssec_anchors(res), |
| 1276 | &result))) { |
| 1277 | |
| 1278 | for (key_i = 0; |
| 1279 | key_i < ldns_rr_list_rr_count(trusted_keys); |
| 1280 | key_i++) { |
| 1281 | cur_key = ldns_rr_list_rr(trusted_keys, key_i); |
| 1282 | |
| 1283 | if ((result = ldns_verify_rrsig(rrset, |
| 1284 | cur_sig, |
| 1285 | cur_key)) |
| 1286 | == LDNS_STATUS_OK) { |
| 1287 | if (validating_keys) { |
| 1288 | ldns_rr_list_push_rr(validating_keys, |
| 1289 | ldns_rr_clone(cur_key)); |
| 1290 | } |
| 1291 | ldns_rr_list_deep_free(trusted_keys); |
| 1292 | return LDNS_STATUS_OK; |
| 1293 | } else { |
| 1294 | ldns_rr_list_print(stdout, rrset); |
| 1295 | ldns_rr_print(stdout, cur_sig); |
| 1296 | ldns_rr_print(stdout, cur_key); |
| 1297 | |
| 1298 | } |
| 1299 | } |
| 1300 | } |
| 1301 | } |
| 1302 | |
| 1303 | ldns_rr_list_deep_free(trusted_keys); |
| 1304 | return result; |
| 1305 | } |
| 1306 | |
| 1307 | ldns_status |
| 1308 | ldns_dnssec_verify_denial(ldns_rr *rr, |
| 1309 | ldns_rr_list *nsecs, |
| 1310 | ldns_rr_list *rrsigs) |
| 1311 | { |
| 1312 | ldns_rdf *rr_name; |
| 1313 | ldns_rdf *wildcard_name; |
| 1314 | ldns_rdf *chopped_dname; |
| 1315 | ldns_rr *cur_nsec; |
| 1316 | size_t i; |
| 1317 | ldns_status result; |
| 1318 | /* needed for wildcard check on exact match */ |
| 1319 | ldns_rr *rrsig; |
| 1320 | bool name_covered = false; |
| 1321 | bool type_covered = false; |
| 1322 | bool wildcard_covered = false; |
| 1323 | bool wildcard_type_covered = false; |
| 1324 | |
| 1325 | wildcard_name = ldns_dname_new_frm_str("*"); |
| 1326 | rr_name = ldns_rr_owner(rr); |
| 1327 | chopped_dname = ldns_dname_left_chop(rr_name); |
| 1328 | result = ldns_dname_cat(wildcard_name, chopped_dname); |
| 1329 | if (result != LDNS_STATUS_OK) { |
| 1330 | return result; |
| 1331 | } |
| 1332 | |
| 1333 | ldns_rdf_deep_free(chopped_dname); |
| 1334 | |
| 1335 | for (i = 0; i < ldns_rr_list_rr_count(nsecs); i++) { |
| 1336 | cur_nsec = ldns_rr_list_rr(nsecs, i); |
| 1337 | if (ldns_dname_compare(rr_name, ldns_rr_owner(cur_nsec)) == 0) { |
| 1338 | /* see section 5.4 of RFC4035, if the label count of the NSEC's |
| 1339 | RRSIG is equal, then it is proven that wildcard expansion |
| 1340 | could not have been used to match the request */ |
| 1341 | rrsig = ldns_dnssec_get_rrsig_for_name_and_type( |
| 1342 | ldns_rr_owner(cur_nsec), |
| 1343 | ldns_rr_get_type(cur_nsec), |
| 1344 | rrsigs); |
| 1345 | if (rrsig && ldns_rdf2native_int8(ldns_rr_rrsig_labels(rrsig)) |
| 1346 | == ldns_dname_label_count(rr_name)) { |
| 1347 | wildcard_covered = true; |
| 1348 | } |
| 1349 | |
| 1350 | if (ldns_nsec_bitmap_covers_type(ldns_nsec_get_bitmap(cur_nsec), |
| 1351 | ldns_rr_get_type(rr))) { |
| 1352 | type_covered = true; |
| 1353 | } |
| 1354 | } |
| 1355 | if (ldns_nsec_covers_name(cur_nsec, rr_name)) { |
| 1356 | name_covered = true; |
| 1357 | } |
| 1358 | |
| 1359 | if (ldns_dname_compare(wildcard_name, |
| 1360 | ldns_rr_owner(cur_nsec)) == 0) { |
| 1361 | if (ldns_nsec_bitmap_covers_type(ldns_nsec_get_bitmap(cur_nsec), |
| 1362 | ldns_rr_get_type(rr))) { |
| 1363 | wildcard_type_covered = true; |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | if (ldns_nsec_covers_name(cur_nsec, wildcard_name)) { |
| 1368 | wildcard_covered = true; |
| 1369 | } |
| 1370 | |
| 1371 | } |
| 1372 | |
| 1373 | ldns_rdf_deep_free(wildcard_name); |
| 1374 | |
| 1375 | if (type_covered || !name_covered) { |
| 1376 | return LDNS_STATUS_DNSSEC_NSEC_RR_NOT_COVERED; |
| 1377 | } |
| 1378 | |
| 1379 | if (wildcard_type_covered || !wildcard_covered) { |
| 1380 | return LDNS_STATUS_DNSSEC_NSEC_WILDCARD_NOT_COVERED; |
| 1381 | } |
| 1382 | |
| 1383 | return LDNS_STATUS_OK; |
| 1384 | } |
| 1385 | |
| 1386 | #ifdef HAVE_SSL |
| 1387 | ldns_status |
| 1388 | ldns_dnssec_verify_denial_nsec3(ldns_rr *rr, |
| 1389 | ldns_rr_list *nsecs, |
| 1390 | ldns_rr_list *rrsigs, |
| 1391 | ldns_pkt_rcode packet_rcode, |
| 1392 | ldns_rr_type packet_qtype, |
| 1393 | bool packet_nodata) |
| 1394 | { |
| 1395 | ldns_rdf *closest_encloser; |
| 1396 | ldns_rdf *wildcard; |
| 1397 | ldns_rdf *hashed_wildcard_name; |
| 1398 | bool wildcard_covered = false; |
| 1399 | ldns_rdf *zone_name; |
| 1400 | ldns_rdf *hashed_name; |
| 1401 | size_t i; |
| 1402 | ldns_status result = LDNS_STATUS_DNSSEC_NSEC_RR_NOT_COVERED; |
| 1403 | |
| 1404 | rrsigs = rrsigs; |
| 1405 | |
| 1406 | zone_name = ldns_dname_left_chop(ldns_rr_owner(ldns_rr_list_rr(nsecs,0))); |
| 1407 | |
| 1408 | /* section 8.4 */ |
| 1409 | if (packet_rcode == LDNS_RCODE_NXDOMAIN) { |
| 1410 | closest_encloser = ldns_dnssec_nsec3_closest_encloser( |
| 1411 | ldns_rr_owner(rr), |
| 1412 | ldns_rr_get_type(rr), |
| 1413 | nsecs); |
| 1414 | if(!closest_encloser) { |
| 1415 | result = LDNS_STATUS_NSEC3_ERR; |
| 1416 | goto done; |
| 1417 | } |
| 1418 | |
| 1419 | wildcard = ldns_dname_new_frm_str("*"); |
| 1420 | (void) ldns_dname_cat(wildcard, closest_encloser); |
| 1421 | |
| 1422 | for (i = 0; i < ldns_rr_list_rr_count(nsecs); i++) { |
| 1423 | hashed_wildcard_name = |
| 1424 | ldns_nsec3_hash_name_frm_nsec3(ldns_rr_list_rr(nsecs, 0), |
| 1425 | wildcard |
| 1426 | ); |
| 1427 | (void) ldns_dname_cat(hashed_wildcard_name, zone_name); |
| 1428 | |
| 1429 | if (ldns_nsec_covers_name(ldns_rr_list_rr(nsecs, i), |
| 1430 | hashed_wildcard_name)) { |
| 1431 | wildcard_covered = true; |
| 1432 | } |
| 1433 | ldns_rdf_deep_free(hashed_wildcard_name); |
| 1434 | } |
| 1435 | |
| 1436 | ldns_rdf_deep_free(closest_encloser); |
| 1437 | ldns_rdf_deep_free(wildcard); |
| 1438 | |
| 1439 | if (!wildcard_covered) { |
| 1440 | result = LDNS_STATUS_DNSSEC_NSEC_WILDCARD_NOT_COVERED; |
| 1441 | } else if (closest_encloser && wildcard_covered) { |
| 1442 | result = LDNS_STATUS_OK; |
| 1443 | } else { |
| 1444 | result = LDNS_STATUS_DNSSEC_NSEC_RR_NOT_COVERED; |
| 1445 | } |
| 1446 | } else if (packet_nodata && packet_qtype != LDNS_RR_TYPE_DS) { |
| 1447 | /* section 8.5 */ |
| 1448 | hashed_name = ldns_nsec3_hash_name_frm_nsec3( |
| 1449 | ldns_rr_list_rr(nsecs, 0), |
| 1450 | ldns_rr_owner(rr)); |
| 1451 | (void) ldns_dname_cat(hashed_name, zone_name); |
| 1452 | for (i = 0; i < ldns_rr_list_rr_count(nsecs); i++) { |
| 1453 | if (ldns_dname_compare(hashed_name, |
| 1454 | ldns_rr_owner(ldns_rr_list_rr(nsecs, i))) |
| 1455 | == 0) { |
| 1456 | if (!ldns_nsec_bitmap_covers_type( |
| 1457 | ldns_nsec3_bitmap(ldns_rr_list_rr(nsecs, i)), |
| 1458 | packet_qtype) |
| 1459 | && |
| 1460 | !ldns_nsec_bitmap_covers_type( |
| 1461 | ldns_nsec3_bitmap(ldns_rr_list_rr(nsecs, i)), |
| 1462 | LDNS_RR_TYPE_CNAME)) { |
| 1463 | result = LDNS_STATUS_OK; |
| 1464 | goto done; |
| 1465 | } |
| 1466 | } |
| 1467 | } |
| 1468 | result = LDNS_STATUS_DNSSEC_NSEC_RR_NOT_COVERED; |
| 1469 | } else if (packet_nodata && packet_qtype == LDNS_RR_TYPE_DS) { |
| 1470 | /* section 8.6 */ |
| 1471 | /* note: up to XXX this is the same as for 8.5 */ |
| 1472 | hashed_name = ldns_nsec3_hash_name_frm_nsec3(ldns_rr_list_rr(nsecs, |
| 1473 | 0), |
| 1474 | ldns_rr_owner(rr) |
| 1475 | ); |
| 1476 | (void) ldns_dname_cat(hashed_name, zone_name); |
| 1477 | for (i = 0; i < ldns_rr_list_rr_count(nsecs); i++) { |
| 1478 | if (ldns_dname_compare(hashed_name, |
| 1479 | ldns_rr_owner(ldns_rr_list_rr(nsecs, |
| 1480 | i))) |
| 1481 | == 0) { |
| 1482 | if (!ldns_nsec_bitmap_covers_type( |
| 1483 | ldns_nsec3_bitmap(ldns_rr_list_rr(nsecs, i)), |
| 1484 | LDNS_RR_TYPE_DS) |
| 1485 | && |
| 1486 | !ldns_nsec_bitmap_covers_type( |
| 1487 | ldns_nsec3_bitmap(ldns_rr_list_rr(nsecs, i)), |
| 1488 | LDNS_RR_TYPE_CNAME)) { |
| 1489 | result = LDNS_STATUS_OK; |
| 1490 | goto done; |
| 1491 | } |
| 1492 | } |
| 1493 | } |
| 1494 | |
| 1495 | /* XXX see note above */ |
| 1496 | result = LDNS_STATUS_DNSSEC_NSEC_RR_NOT_COVERED; |
| 1497 | } |
| 1498 | |
| 1499 | done: |
| 1500 | ldns_rdf_deep_free(zone_name); |
| 1501 | return result; |
| 1502 | } |
| 1503 | #endif /* HAVE_SSL */ |
| 1504 | |
| 1505 | #ifdef USE_GOST |
| 1506 | EVP_PKEY* |
| 1507 | ldns_gost2pkey_raw(unsigned char* key, size_t keylen) |
| 1508 | { |
| 1509 | /* prefix header for X509 encoding */ |
| 1510 | uint8_t asn[37] = { 0x30, 0x63, 0x30, 0x1c, 0x06, 0x06, 0x2a, 0x85, |
| 1511 | 0x03, 0x02, 0x02, 0x13, 0x30, 0x12, 0x06, 0x07, 0x2a, 0x85, |
| 1512 | 0x03, 0x02, 0x02, 0x23, 0x01, 0x06, 0x07, 0x2a, 0x85, 0x03, |
| 1513 | 0x02, 0x02, 0x1e, 0x01, 0x03, 0x43, 0x00, 0x04, 0x40}; |
| 1514 | unsigned char encoded[37+64]; |
| 1515 | const unsigned char* pp; |
| 1516 | if(keylen != 64) { |
| 1517 | /* key wrong size */ |
| 1518 | return NULL; |
| 1519 | } |
| 1520 | |
| 1521 | /* create evp_key */ |
| 1522 | memmove(encoded, asn, 37); |
| 1523 | memmove(encoded+37, key, 64); |
| 1524 | pp = (unsigned char*)&encoded[0]; |
| 1525 | |
| 1526 | return d2i_PUBKEY(NULL, &pp, sizeof(encoded)); |
| 1527 | } |
| 1528 | |
| 1529 | static ldns_status |
| 1530 | ldns_verify_rrsig_gost_raw(unsigned char* sig, size_t siglen, |
| 1531 | ldns_buffer* rrset, unsigned char* key, size_t keylen) |
| 1532 | { |
| 1533 | EVP_PKEY *evp_key; |
| 1534 | ldns_status result; |
| 1535 | |
| 1536 | (void) ldns_key_EVP_load_gost_id(); |
| 1537 | evp_key = ldns_gost2pkey_raw(key, keylen); |
| 1538 | if(!evp_key) { |
| 1539 | /* could not convert key */ |
| 1540 | return LDNS_STATUS_CRYPTO_BOGUS; |
| 1541 | } |
| 1542 | |
| 1543 | /* verify signature */ |
| 1544 | result = ldns_verify_rrsig_evp_raw(sig, siglen, rrset, |
| 1545 | evp_key, EVP_get_digestbyname("md_gost94")); |
| 1546 | EVP_PKEY_free(evp_key); |
| 1547 | |
| 1548 | return result; |
| 1549 | } |
| 1550 | #endif |
| 1551 | |
| 1552 | #ifdef USE_ECDSA |
| 1553 | EVP_PKEY* |
| 1554 | ldns_ecdsa2pkey_raw(unsigned char* key, size_t keylen, uint8_t algo) |
| 1555 | { |
| 1556 | unsigned char buf[256+2]; /* sufficient for 2*384/8+1 */ |
| 1557 | const unsigned char* pp = buf; |
| 1558 | EVP_PKEY *evp_key; |
| 1559 | EC_KEY *ec; |
| 1560 | /* check length, which uncompressed must be 2 bignums */ |
| 1561 | if(algo == LDNS_ECDSAP256SHA256) { |
| 1562 | if(keylen != 2*256/8) return NULL; |
| 1563 | ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); |
| 1564 | } else if(algo == LDNS_ECDSAP384SHA384) { |
| 1565 | if(keylen != 2*384/8) return NULL; |
| 1566 | ec = EC_KEY_new_by_curve_name(NID_secp384r1); |
| 1567 | } else ec = NULL; |
| 1568 | if(!ec) return NULL; |
| 1569 | if(keylen+1 > sizeof(buf)) |
| 1570 | return NULL; /* sanity check */ |
| 1571 | /* prepend the 0x02 (from docs) (or actually 0x04 from implementation |
| 1572 | * of openssl) for uncompressed data */ |
| 1573 | buf[0] = POINT_CONVERSION_UNCOMPRESSED; |
| 1574 | memmove(buf+1, key, keylen); |
| 1575 | if(!o2i_ECPublicKey(&ec, &pp, keylen+1)) { |
| 1576 | EC_KEY_free(ec); |
| 1577 | return NULL; |
| 1578 | } |
| 1579 | evp_key = EVP_PKEY_new(); |
| 1580 | if(!evp_key) { |
| 1581 | EC_KEY_free(ec); |
| 1582 | return NULL; |
| 1583 | } |
| 1584 | EVP_PKEY_assign_EC_KEY(evp_key, ec); |
| 1585 | return evp_key; |
| 1586 | } |
| 1587 | |
| 1588 | static ldns_status |
| 1589 | ldns_verify_rrsig_ecdsa_raw(unsigned char* sig, size_t siglen, |
| 1590 | ldns_buffer* rrset, unsigned char* key, size_t keylen, uint8_t algo) |
| 1591 | { |
| 1592 | EVP_PKEY *evp_key; |
| 1593 | ldns_status result; |
| 1594 | const EVP_MD *d; |
| 1595 | |
| 1596 | evp_key = ldns_ecdsa2pkey_raw(key, keylen, algo); |
| 1597 | if(!evp_key) { |
| 1598 | /* could not convert key */ |
| 1599 | return LDNS_STATUS_CRYPTO_BOGUS; |
| 1600 | } |
| 1601 | if(algo == LDNS_ECDSAP256SHA256) |
| 1602 | d = EVP_sha256(); |
| 1603 | else d = EVP_sha384(); /* LDNS_ECDSAP384SHA384 */ |
| 1604 | result = ldns_verify_rrsig_evp_raw(sig, siglen, rrset, evp_key, d); |
| 1605 | EVP_PKEY_free(evp_key); |
| 1606 | return result; |
| 1607 | } |
| 1608 | #endif |
| 1609 | |
| 1610 | ldns_status |
| 1611 | ldns_verify_rrsig_buffers(ldns_buffer *rawsig_buf, ldns_buffer *verify_buf, |
| 1612 | ldns_buffer *key_buf, uint8_t algo) |
| 1613 | { |
| 1614 | return ldns_verify_rrsig_buffers_raw( |
| 1615 | (unsigned char*)ldns_buffer_begin(rawsig_buf), |
| 1616 | ldns_buffer_position(rawsig_buf), |
| 1617 | verify_buf, |
| 1618 | (unsigned char*)ldns_buffer_begin(key_buf), |
| 1619 | ldns_buffer_position(key_buf), algo); |
| 1620 | } |
| 1621 | |
| 1622 | ldns_status |
| 1623 | ldns_verify_rrsig_buffers_raw(unsigned char* sig, size_t siglen, |
| 1624 | ldns_buffer *verify_buf, unsigned char* key, size_t keylen, |
| 1625 | uint8_t algo) |
| 1626 | { |
| 1627 | /* check for right key */ |
| 1628 | switch(algo) { |
| 1629 | case LDNS_DSA: |
| 1630 | case LDNS_DSA_NSEC3: |
| 1631 | return ldns_verify_rrsig_dsa_raw(sig, |
| 1632 | siglen, |
| 1633 | verify_buf, |
| 1634 | key, |
| 1635 | keylen); |
| 1636 | break; |
| 1637 | case LDNS_RSASHA1: |
| 1638 | case LDNS_RSASHA1_NSEC3: |
| 1639 | return ldns_verify_rrsig_rsasha1_raw(sig, |
| 1640 | siglen, |
| 1641 | verify_buf, |
| 1642 | key, |
| 1643 | keylen); |
| 1644 | break; |
| 1645 | #ifdef USE_SHA2 |
| 1646 | case LDNS_RSASHA256: |
| 1647 | return ldns_verify_rrsig_rsasha256_raw(sig, |
| 1648 | siglen, |
| 1649 | verify_buf, |
| 1650 | key, |
| 1651 | keylen); |
| 1652 | break; |
| 1653 | case LDNS_RSASHA512: |
| 1654 | return ldns_verify_rrsig_rsasha512_raw(sig, |
| 1655 | siglen, |
| 1656 | verify_buf, |
| 1657 | key, |
| 1658 | keylen); |
| 1659 | break; |
| 1660 | #endif |
| 1661 | #ifdef USE_GOST |
| 1662 | case LDNS_ECC_GOST: |
| 1663 | return ldns_verify_rrsig_gost_raw(sig, siglen, verify_buf, |
| 1664 | key, keylen); |
| 1665 | break; |
| 1666 | #endif |
| 1667 | #ifdef USE_ECDSA |
| 1668 | case LDNS_ECDSAP256SHA256: |
| 1669 | case LDNS_ECDSAP384SHA384: |
| 1670 | return ldns_verify_rrsig_ecdsa_raw(sig, siglen, verify_buf, |
| 1671 | key, keylen, algo); |
| 1672 | break; |
| 1673 | #endif |
| 1674 | case LDNS_RSAMD5: |
| 1675 | return ldns_verify_rrsig_rsamd5_raw(sig, |
| 1676 | siglen, |
| 1677 | verify_buf, |
| 1678 | key, |
| 1679 | keylen); |
| 1680 | break; |
| 1681 | default: |
| 1682 | /* do you know this alg?! */ |
| 1683 | return LDNS_STATUS_CRYPTO_UNKNOWN_ALGO; |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | |
| 1688 | /** |
| 1689 | * Reset the ttl in the rrset with the orig_ttl from the sig |
| 1690 | * and update owner name if it was wildcard |
| 1691 | * Also canonicalizes the rrset. |
| 1692 | * @param rrset: rrset to modify |
| 1693 | * @param sig: signature to take TTL and wildcard values from |
| 1694 | */ |
| 1695 | static void |
| 1696 | ldns_rrset_use_signature_ttl(ldns_rr_list* rrset_clone, ldns_rr* rrsig) |
| 1697 | { |
| 1698 | uint32_t orig_ttl; |
| 1699 | uint16_t i; |
| 1700 | uint8_t label_count; |
| 1701 | ldns_rdf *wildcard_name; |
| 1702 | ldns_rdf *wildcard_chopped; |
| 1703 | ldns_rdf *wildcard_chopped_tmp; |
| 1704 | |
| 1705 | orig_ttl = ldns_rdf2native_int32( ldns_rr_rdf(rrsig, 3)); |
| 1706 | label_count = ldns_rdf2native_int8(ldns_rr_rdf(rrsig, 2)); |
| 1707 | |
| 1708 | for(i = 0; i < ldns_rr_list_rr_count(rrset_clone); i++) { |
| 1709 | if (label_count < |
| 1710 | ldns_dname_label_count( |
| 1711 | ldns_rr_owner(ldns_rr_list_rr(rrset_clone, i)))) { |
| 1712 | (void) ldns_str2rdf_dname(&wildcard_name, "*"); |
| 1713 | wildcard_chopped = ldns_rdf_clone(ldns_rr_owner( |
| 1714 | ldns_rr_list_rr(rrset_clone, i))); |
| 1715 | while (label_count < ldns_dname_label_count(wildcard_chopped)) { |
| 1716 | wildcard_chopped_tmp = ldns_dname_left_chop( |
| 1717 | wildcard_chopped); |
| 1718 | ldns_rdf_deep_free(wildcard_chopped); |
| 1719 | wildcard_chopped = wildcard_chopped_tmp; |
| 1720 | } |
| 1721 | (void) ldns_dname_cat(wildcard_name, wildcard_chopped); |
| 1722 | ldns_rdf_deep_free(wildcard_chopped); |
| 1723 | ldns_rdf_deep_free(ldns_rr_owner(ldns_rr_list_rr( |
| 1724 | rrset_clone, i))); |
| 1725 | ldns_rr_set_owner(ldns_rr_list_rr(rrset_clone, i), |
| 1726 | wildcard_name); |
| 1727 | } |
| 1728 | ldns_rr_set_ttl(ldns_rr_list_rr(rrset_clone, i), orig_ttl); |
| 1729 | /* convert to lowercase */ |
| 1730 | ldns_rr2canonical(ldns_rr_list_rr(rrset_clone, i)); |
| 1731 | } |
| 1732 | } |
| 1733 | |
| 1734 | /** |
| 1735 | * Make raw signature buffer out of rrsig |
| 1736 | * @param rawsig_buf: raw signature buffer for result |
| 1737 | * @param rrsig: signature to convert |
| 1738 | * @return OK or more specific error. |
| 1739 | */ |
| 1740 | static ldns_status |
| 1741 | ldns_rrsig2rawsig_buffer(ldns_buffer* rawsig_buf, ldns_rr* rrsig) |
| 1742 | { |
| 1743 | uint8_t sig_algo = ldns_rdf2native_int8(ldns_rr_rdf(rrsig, 1)); |
| 1744 | /* check for known and implemented algo's now (otherwise |
| 1745 | * the function could return a wrong error |
| 1746 | */ |
| 1747 | /* create a buffer with signature rdata */ |
| 1748 | /* for some algorithms we need other data than for others... */ |
| 1749 | /* (the DSA API wants DER encoding for instance) */ |
| 1750 | |
| 1751 | switch(sig_algo) { |
| 1752 | case LDNS_RSAMD5: |
| 1753 | case LDNS_RSASHA1: |
| 1754 | case LDNS_RSASHA1_NSEC3: |
| 1755 | #ifdef USE_SHA2 |
| 1756 | case LDNS_RSASHA256: |
| 1757 | case LDNS_RSASHA512: |
| 1758 | #endif |
| 1759 | #ifdef USE_GOST |
| 1760 | case LDNS_ECC_GOST: |
| 1761 | #endif |
| 1762 | if (ldns_rdf2buffer_wire(rawsig_buf, |
| 1763 | ldns_rr_rdf(rrsig, 8)) != LDNS_STATUS_OK) { |
| 1764 | return LDNS_STATUS_MEM_ERR; |
| 1765 | } |
| 1766 | break; |
| 1767 | case LDNS_DSA: |
| 1768 | case LDNS_DSA_NSEC3: |
| 1769 | /* EVP takes rfc2459 format, which is a tad longer than dns format */ |
| 1770 | if (ldns_convert_dsa_rrsig_rdf2asn1(rawsig_buf, |
| 1771 | ldns_rr_rdf(rrsig, 8)) != LDNS_STATUS_OK) { |
| 1772 | /* |
| 1773 | if (ldns_rdf2buffer_wire(rawsig_buf, |
| 1774 | ldns_rr_rdf(rrsig, 8)) != LDNS_STATUS_OK) { |
| 1775 | */ |
| 1776 | return LDNS_STATUS_MEM_ERR; |
| 1777 | } |
| 1778 | break; |
| 1779 | #ifdef USE_ECDSA |
| 1780 | case LDNS_ECDSAP256SHA256: |
| 1781 | case LDNS_ECDSAP384SHA384: |
| 1782 | /* EVP produces an ASN prefix on the signature, which is |
| 1783 | * not used in the DNS */ |
| 1784 | if (ldns_convert_ecdsa_rrsig_rdf2asn1(rawsig_buf, |
| 1785 | ldns_rr_rdf(rrsig, 8)) != LDNS_STATUS_OK) { |
| 1786 | return LDNS_STATUS_MEM_ERR; |
| 1787 | } |
| 1788 | break; |
| 1789 | #endif |
| 1790 | case LDNS_DH: |
| 1791 | case LDNS_ECC: |
| 1792 | case LDNS_INDIRECT: |
| 1793 | return LDNS_STATUS_CRYPTO_ALGO_NOT_IMPL; |
| 1794 | default: |
| 1795 | return LDNS_STATUS_CRYPTO_UNKNOWN_ALGO; |
| 1796 | } |
| 1797 | return LDNS_STATUS_OK; |
| 1798 | } |
| 1799 | |
| 1800 | /** |
| 1801 | * Check RRSIG timestamps against the given 'now' time. |
| 1802 | * @param rrsig: signature to check. |
| 1803 | * @param now: the current time in seconds epoch. |
| 1804 | * @return status code LDNS_STATUS_OK if all is fine. |
| 1805 | */ |
| 1806 | static ldns_status |
| 1807 | ldns_rrsig_check_timestamps(ldns_rr* rrsig, int32_t now) |
| 1808 | { |
| 1809 | int32_t inception, expiration; |
| 1810 | |
| 1811 | /* check the signature time stamps */ |
| 1812 | inception = (int32_t)ldns_rdf2native_time_t( |
| 1813 | ldns_rr_rrsig_inception(rrsig)); |
| 1814 | expiration = (int32_t)ldns_rdf2native_time_t( |
| 1815 | ldns_rr_rrsig_expiration(rrsig)); |
| 1816 | |
| 1817 | if (expiration - inception < 0) { |
| 1818 | /* bad sig, expiration before inception?? Tsssg */ |
| 1819 | return LDNS_STATUS_CRYPTO_EXPIRATION_BEFORE_INCEPTION; |
| 1820 | } |
| 1821 | if (now - inception < 0) { |
| 1822 | /* bad sig, inception date has not yet come to pass */ |
| 1823 | return LDNS_STATUS_CRYPTO_SIG_NOT_INCEPTED; |
| 1824 | } |
| 1825 | if (expiration - now < 0) { |
| 1826 | /* bad sig, expiration date has passed */ |
| 1827 | return LDNS_STATUS_CRYPTO_SIG_EXPIRED; |
| 1828 | } |
| 1829 | return LDNS_STATUS_OK; |
| 1830 | } |
| 1831 | |
| 1832 | /** |
| 1833 | * Prepare for verification. |
| 1834 | * @param rawsig_buf: raw signature buffer made ready. |
| 1835 | * @param verify_buf: data for verification buffer made ready. |
| 1836 | * @param rrset_clone: made ready. |
| 1837 | * @param rrsig: signature to prepare for. |
| 1838 | * @return LDNS_STATUS_OK is all went well. Otherwise specific error. |
| 1839 | */ |
| 1840 | static ldns_status |
| 1841 | ldns_prepare_for_verify(ldns_buffer* rawsig_buf, ldns_buffer* verify_buf, |
| 1842 | ldns_rr_list* rrset_clone, ldns_rr* rrsig) |
| 1843 | { |
| 1844 | ldns_status result; |
| 1845 | |
| 1846 | /* canonicalize the sig */ |
| 1847 | ldns_dname2canonical(ldns_rr_owner(rrsig)); |
| 1848 | |
| 1849 | /* check if the typecovered is equal to the type checked */ |
| 1850 | if (ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(rrsig)) != |
| 1851 | ldns_rr_get_type(ldns_rr_list_rr(rrset_clone, 0))) |
| 1852 | return LDNS_STATUS_CRYPTO_TYPE_COVERED_ERR; |
| 1853 | |
| 1854 | /* create a buffer with b64 signature rdata */ |
| 1855 | result = ldns_rrsig2rawsig_buffer(rawsig_buf, rrsig); |
| 1856 | if(result != LDNS_STATUS_OK) |
| 1857 | return result; |
| 1858 | |
| 1859 | /* use TTL from signature. Use wildcard names for wildcards */ |
| 1860 | /* also canonicalizes rrset_clone */ |
| 1861 | ldns_rrset_use_signature_ttl(rrset_clone, rrsig); |
| 1862 | |
| 1863 | /* sort the rrset in canonical order */ |
| 1864 | ldns_rr_list_sort(rrset_clone); |
| 1865 | |
| 1866 | /* put the signature rr (without the b64) to the verify_buf */ |
| 1867 | if (ldns_rrsig2buffer_wire(verify_buf, rrsig) != LDNS_STATUS_OK) |
| 1868 | return LDNS_STATUS_MEM_ERR; |
| 1869 | |
| 1870 | /* add the rrset in verify_buf */ |
| 1871 | if(ldns_rr_list2buffer_wire(verify_buf, rrset_clone) |
| 1872 | != LDNS_STATUS_OK) |
| 1873 | return LDNS_STATUS_MEM_ERR; |
| 1874 | |
| 1875 | return LDNS_STATUS_OK; |
| 1876 | } |
| 1877 | |
| 1878 | /** |
| 1879 | * Check if a key matches a signature. |
| 1880 | * Checks keytag, sigalgo and signature. |
| 1881 | * @param rawsig_buf: raw signature buffer for verify |
| 1882 | * @param verify_buf: raw data buffer for verify |
| 1883 | * @param rrsig: the rrsig |
| 1884 | * @param key: key to attempt. |
| 1885 | * @return LDNS_STATUS_OK if OK, else some specific error. |
| 1886 | */ |
| 1887 | static ldns_status |
| 1888 | ldns_verify_test_sig_key(ldns_buffer* rawsig_buf, ldns_buffer* verify_buf, |
| 1889 | ldns_rr* rrsig, ldns_rr* key) |
| 1890 | { |
| 1891 | uint8_t sig_algo = ldns_rdf2native_int8(ldns_rr_rdf(rrsig, 1)); |
| 1892 | |
| 1893 | /* before anything, check if the keytags match */ |
| 1894 | if (ldns_calc_keytag(key) |
| 1895 | == |
| 1896 | ldns_rdf2native_int16(ldns_rr_rrsig_keytag(rrsig)) |
| 1897 | ) { |
| 1898 | ldns_buffer* key_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN); |
| 1899 | ldns_status result = LDNS_STATUS_ERR; |
| 1900 | |
| 1901 | /* put the key-data in a buffer, that's the third rdf, with |
| 1902 | * the base64 encoded key data */ |
| 1903 | if (ldns_rdf2buffer_wire(key_buf, ldns_rr_rdf(key, 3)) |
| 1904 | != LDNS_STATUS_OK) { |
| 1905 | ldns_buffer_free(key_buf); |
| 1906 | /* returning is bad might screw up |
| 1907 | good keys later in the list |
| 1908 | what to do? */ |
| 1909 | return LDNS_STATUS_ERR; |
| 1910 | } |
| 1911 | |
| 1912 | if (sig_algo == ldns_rdf2native_int8(ldns_rr_rdf(key, 2))) { |
| 1913 | result = ldns_verify_rrsig_buffers(rawsig_buf, |
| 1914 | verify_buf, key_buf, sig_algo); |
| 1915 | } else { |
| 1916 | /* No keys with the corresponding algorithm are found */ |
| 1917 | result = LDNS_STATUS_CRYPTO_NO_MATCHING_KEYTAG_DNSKEY; |
| 1918 | } |
| 1919 | |
| 1920 | ldns_buffer_free(key_buf); |
| 1921 | return result; |
| 1922 | } |
| 1923 | else { |
| 1924 | /* No keys with the corresponding keytag are found */ |
| 1925 | return LDNS_STATUS_CRYPTO_NO_MATCHING_KEYTAG_DNSKEY; |
| 1926 | } |
| 1927 | } |
| 1928 | |
| 1929 | /* |
| 1930 | * to verify: |
| 1931 | * - create the wire fmt of the b64 key rdata |
| 1932 | * - create the wire fmt of the sorted rrset |
| 1933 | * - create the wire fmt of the b64 sig rdata |
| 1934 | * - create the wire fmt of the sig without the b64 rdata |
| 1935 | * - cat the sig data (without b64 rdata) to the rrset |
| 1936 | * - verify the rrset+sig, with the b64 data and the b64 key data |
| 1937 | */ |
| 1938 | ldns_status |
| 1939 | ldns_verify_rrsig_keylist(ldns_rr_list *rrset, |
| 1940 | ldns_rr *rrsig, |
| 1941 | const ldns_rr_list *keys, |
| 1942 | ldns_rr_list *good_keys) |
| 1943 | { |
| 1944 | ldns_status result; |
| 1945 | ldns_rr_list *valid = ldns_rr_list_new(); |
| 1946 | if (!valid) |
| 1947 | return LDNS_STATUS_MEM_ERR; |
| 1948 | |
| 1949 | result = ldns_verify_rrsig_keylist_notime(rrset, rrsig, keys, valid); |
| 1950 | if(result != LDNS_STATUS_OK) { |
| 1951 | ldns_rr_list_free(valid); |
| 1952 | return result; |
| 1953 | } |
| 1954 | |
| 1955 | /* check timestamps last; its OK except time */ |
| 1956 | result = ldns_rrsig_check_timestamps(rrsig, (int32_t)time(NULL)); |
| 1957 | if(result != LDNS_STATUS_OK) { |
| 1958 | ldns_rr_list_free(valid); |
| 1959 | return result; |
| 1960 | } |
| 1961 | |
| 1962 | ldns_rr_list_cat(good_keys, valid); |
| 1963 | ldns_rr_list_free(valid); |
| 1964 | return LDNS_STATUS_OK; |
| 1965 | } |
| 1966 | |
| 1967 | ldns_status |
| 1968 | ldns_verify_rrsig_keylist_notime(ldns_rr_list *rrset, |
| 1969 | ldns_rr *rrsig, |
| 1970 | const ldns_rr_list *keys, |
| 1971 | ldns_rr_list *good_keys) |
| 1972 | { |
| 1973 | ldns_buffer *rawsig_buf; |
| 1974 | ldns_buffer *verify_buf; |
| 1975 | uint16_t i; |
| 1976 | ldns_status result, status; |
| 1977 | ldns_rr_list *rrset_clone; |
| 1978 | ldns_rr_list *validkeys; |
| 1979 | |
| 1980 | if (!rrset) { |
| 1981 | return LDNS_STATUS_ERR; |
| 1982 | } |
| 1983 | |
| 1984 | validkeys = ldns_rr_list_new(); |
| 1985 | if (!validkeys) { |
| 1986 | return LDNS_STATUS_MEM_ERR; |
| 1987 | } |
| 1988 | |
| 1989 | /* clone the rrset so that we can fiddle with it */ |
| 1990 | rrset_clone = ldns_rr_list_clone(rrset); |
| 1991 | |
| 1992 | /* create the buffers which will certainly hold the raw data */ |
| 1993 | rawsig_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN); |
| 1994 | verify_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN); |
| 1995 | |
| 1996 | result = ldns_prepare_for_verify(rawsig_buf, verify_buf, |
| 1997 | rrset_clone, rrsig); |
| 1998 | if(result != LDNS_STATUS_OK) { |
| 1999 | ldns_buffer_free(verify_buf); |
| 2000 | ldns_buffer_free(rawsig_buf); |
| 2001 | ldns_rr_list_deep_free(rrset_clone); |
| 2002 | ldns_rr_list_free(validkeys); |
| 2003 | return result; |
| 2004 | } |
| 2005 | |
| 2006 | result = LDNS_STATUS_CRYPTO_NO_MATCHING_KEYTAG_DNSKEY; |
| 2007 | for(i = 0; i < ldns_rr_list_rr_count(keys); i++) { |
| 2008 | status = ldns_verify_test_sig_key(rawsig_buf, verify_buf, |
| 2009 | rrsig, ldns_rr_list_rr(keys, i)); |
| 2010 | if (status == LDNS_STATUS_OK) { |
| 2011 | /* one of the keys has matched, don't break |
| 2012 | * here, instead put the 'winning' key in |
| 2013 | * the validkey list and return the list |
| 2014 | * later */ |
| 2015 | if (!ldns_rr_list_push_rr(validkeys, |
| 2016 | ldns_rr_list_rr(keys,i))) { |
| 2017 | /* couldn't push the key?? */ |
| 2018 | ldns_buffer_free(rawsig_buf); |
| 2019 | ldns_buffer_free(verify_buf); |
| 2020 | ldns_rr_list_deep_free(rrset_clone); |
| 2021 | ldns_rr_list_free(validkeys); |
| 2022 | return LDNS_STATUS_MEM_ERR; |
| 2023 | } |
| 2024 | |
| 2025 | result = status; |
| 2026 | } |
| 2027 | |
| 2028 | if (result == LDNS_STATUS_CRYPTO_NO_MATCHING_KEYTAG_DNSKEY) { |
| 2029 | result = status; |
| 2030 | } |
| 2031 | } |
| 2032 | |
| 2033 | /* no longer needed */ |
| 2034 | ldns_rr_list_deep_free(rrset_clone); |
| 2035 | ldns_buffer_free(rawsig_buf); |
| 2036 | ldns_buffer_free(verify_buf); |
| 2037 | |
| 2038 | if (ldns_rr_list_rr_count(validkeys) == 0) { |
| 2039 | /* no keys were added, return last error */ |
| 2040 | ldns_rr_list_free(validkeys); |
| 2041 | return result; |
| 2042 | } |
| 2043 | |
| 2044 | /* do not check timestamps */ |
| 2045 | |
| 2046 | ldns_rr_list_cat(good_keys, validkeys); |
| 2047 | ldns_rr_list_free(validkeys); |
| 2048 | return LDNS_STATUS_OK; |
| 2049 | } |
| 2050 | |
| 2051 | ldns_status |
| 2052 | ldns_verify_rrsig(ldns_rr_list *rrset, ldns_rr *rrsig, ldns_rr *key) |
| 2053 | { |
| 2054 | ldns_buffer *rawsig_buf; |
| 2055 | ldns_buffer *verify_buf; |
| 2056 | ldns_status result; |
| 2057 | ldns_rr_list *rrset_clone; |
| 2058 | |
| 2059 | if (!rrset) { |
| 2060 | return LDNS_STATUS_NO_DATA; |
| 2061 | } |
| 2062 | /* clone the rrset so that we can fiddle with it */ |
| 2063 | rrset_clone = ldns_rr_list_clone(rrset); |
| 2064 | /* create the buffers which will certainly hold the raw data */ |
| 2065 | rawsig_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN); |
| 2066 | verify_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN); |
| 2067 | |
| 2068 | result = ldns_prepare_for_verify(rawsig_buf, verify_buf, |
| 2069 | rrset_clone, rrsig); |
| 2070 | if(result != LDNS_STATUS_OK) { |
| 2071 | ldns_rr_list_deep_free(rrset_clone); |
| 2072 | ldns_buffer_free(rawsig_buf); |
| 2073 | ldns_buffer_free(verify_buf); |
| 2074 | return result; |
| 2075 | } |
| 2076 | result = ldns_verify_test_sig_key(rawsig_buf, verify_buf, |
| 2077 | rrsig, key); |
| 2078 | /* no longer needed */ |
| 2079 | ldns_rr_list_deep_free(rrset_clone); |
| 2080 | ldns_buffer_free(rawsig_buf); |
| 2081 | ldns_buffer_free(verify_buf); |
| 2082 | |
| 2083 | /* check timestamp last, apart from time its OK */ |
| 2084 | if(result == LDNS_STATUS_OK) |
| 2085 | result = ldns_rrsig_check_timestamps(rrsig, |
| 2086 | (int32_t)time(NULL)); |
| 2087 | |
| 2088 | return result; |
| 2089 | } |
| 2090 | |
| 2091 | ldns_status |
| 2092 | ldns_verify_rrsig_evp(ldns_buffer *sig, |
| 2093 | ldns_buffer *rrset, |
| 2094 | EVP_PKEY *key, |
| 2095 | const EVP_MD *digest_type) |
| 2096 | { |
| 2097 | return ldns_verify_rrsig_evp_raw( |
| 2098 | (unsigned char*)ldns_buffer_begin(sig), |
| 2099 | ldns_buffer_position(sig), |
| 2100 | rrset, |
| 2101 | key, |
| 2102 | digest_type); |
| 2103 | } |
| 2104 | |
| 2105 | ldns_status |
| 2106 | ldns_verify_rrsig_evp_raw(unsigned char *sig, size_t siglen, |
| 2107 | ldns_buffer *rrset, EVP_PKEY *key, const EVP_MD *digest_type) |
| 2108 | { |
| 2109 | EVP_MD_CTX ctx; |
| 2110 | int res; |
| 2111 | |
| 2112 | EVP_MD_CTX_init(&ctx); |
| 2113 | |
| 2114 | EVP_VerifyInit(&ctx, digest_type); |
| 2115 | EVP_VerifyUpdate(&ctx, |
| 2116 | ldns_buffer_begin(rrset), |
| 2117 | ldns_buffer_position(rrset)); |
| 2118 | res = EVP_VerifyFinal(&ctx, sig, (unsigned int) siglen, key); |
| 2119 | |
| 2120 | EVP_MD_CTX_cleanup(&ctx); |
| 2121 | |
| 2122 | if (res == 1) { |
| 2123 | return LDNS_STATUS_OK; |
| 2124 | } else if (res == 0) { |
| 2125 | return LDNS_STATUS_CRYPTO_BOGUS; |
| 2126 | } |
| 2127 | /* TODO how to communicate internal SSL error? |
| 2128 | let caller use ssl's get_error() */ |
| 2129 | return LDNS_STATUS_SSL_ERR; |
| 2130 | } |
| 2131 | |
| 2132 | ldns_status |
| 2133 | ldns_verify_rrsig_dsa(ldns_buffer *sig, ldns_buffer *rrset, ldns_buffer *key) |
| 2134 | { |
| 2135 | return ldns_verify_rrsig_dsa_raw( |
| 2136 | (unsigned char*) ldns_buffer_begin(sig), |
| 2137 | ldns_buffer_position(sig), |
| 2138 | rrset, |
| 2139 | (unsigned char*) ldns_buffer_begin(key), |
| 2140 | ldns_buffer_position(key)); |
| 2141 | } |
| 2142 | |
| 2143 | ldns_status |
| 2144 | ldns_verify_rrsig_rsasha1(ldns_buffer *sig, ldns_buffer *rrset, ldns_buffer *key) |
| 2145 | { |
| 2146 | return ldns_verify_rrsig_rsasha1_raw( |
| 2147 | (unsigned char*)ldns_buffer_begin(sig), |
| 2148 | ldns_buffer_position(sig), |
| 2149 | rrset, |
| 2150 | (unsigned char*) ldns_buffer_begin(key), |
| 2151 | ldns_buffer_position(key)); |
| 2152 | } |
| 2153 | |
| 2154 | ldns_status |
| 2155 | ldns_verify_rrsig_rsamd5(ldns_buffer *sig, ldns_buffer *rrset, ldns_buffer *key) |
| 2156 | { |
| 2157 | return ldns_verify_rrsig_rsamd5_raw( |
| 2158 | (unsigned char*)ldns_buffer_begin(sig), |
| 2159 | ldns_buffer_position(sig), |
| 2160 | rrset, |
| 2161 | (unsigned char*) ldns_buffer_begin(key), |
| 2162 | ldns_buffer_position(key)); |
| 2163 | } |
| 2164 | |
| 2165 | ldns_status |
| 2166 | ldns_verify_rrsig_dsa_raw(unsigned char* sig, size_t siglen, |
| 2167 | ldns_buffer* rrset, unsigned char* key, size_t keylen) |
| 2168 | { |
| 2169 | EVP_PKEY *evp_key; |
| 2170 | ldns_status result; |
| 2171 | |
| 2172 | evp_key = EVP_PKEY_new(); |
| 2173 | EVP_PKEY_assign_DSA(evp_key, ldns_key_buf2dsa_raw(key, keylen)); |
| 2174 | result = ldns_verify_rrsig_evp_raw(sig, |
| 2175 | siglen, |
| 2176 | rrset, |
| 2177 | evp_key, |
| 2178 | EVP_dss1()); |
| 2179 | EVP_PKEY_free(evp_key); |
| 2180 | return result; |
| 2181 | |
| 2182 | } |
| 2183 | |
| 2184 | ldns_status |
| 2185 | ldns_verify_rrsig_rsasha1_raw(unsigned char* sig, size_t siglen, |
| 2186 | ldns_buffer* rrset, unsigned char* key, size_t keylen) |
| 2187 | { |
| 2188 | EVP_PKEY *evp_key; |
| 2189 | ldns_status result; |
| 2190 | |
| 2191 | evp_key = EVP_PKEY_new(); |
| 2192 | EVP_PKEY_assign_RSA(evp_key, ldns_key_buf2rsa_raw(key, keylen)); |
| 2193 | result = ldns_verify_rrsig_evp_raw(sig, |
| 2194 | siglen, |
| 2195 | rrset, |
| 2196 | evp_key, |
| 2197 | EVP_sha1()); |
| 2198 | EVP_PKEY_free(evp_key); |
| 2199 | |
| 2200 | return result; |
| 2201 | } |
| 2202 | |
| 2203 | ldns_status |
| 2204 | ldns_verify_rrsig_rsasha256_raw(unsigned char* sig, |
| 2205 | size_t siglen, |
| 2206 | ldns_buffer* rrset, |
| 2207 | unsigned char* key, |
| 2208 | size_t keylen) |
| 2209 | { |
| 2210 | #ifdef USE_SHA2 |
| 2211 | EVP_PKEY *evp_key; |
| 2212 | ldns_status result; |
| 2213 | |
| 2214 | evp_key = EVP_PKEY_new(); |
| 2215 | EVP_PKEY_assign_RSA(evp_key, ldns_key_buf2rsa_raw(key, keylen)); |
| 2216 | result = ldns_verify_rrsig_evp_raw(sig, |
| 2217 | siglen, |
| 2218 | rrset, |
| 2219 | evp_key, |
| 2220 | EVP_sha256()); |
| 2221 | EVP_PKEY_free(evp_key); |
| 2222 | |
| 2223 | return result; |
| 2224 | #else |
| 2225 | /* touch these to prevent compiler warnings */ |
| 2226 | (void) sig; |
| 2227 | (void) siglen; |
| 2228 | (void) rrset; |
| 2229 | (void) key; |
| 2230 | (void) keylen; |
| 2231 | return LDNS_STATUS_CRYPTO_UNKNOWN_ALGO; |
| 2232 | #endif |
| 2233 | } |
| 2234 | |
| 2235 | ldns_status |
| 2236 | ldns_verify_rrsig_rsasha512_raw(unsigned char* sig, |
| 2237 | size_t siglen, |
| 2238 | ldns_buffer* rrset, |
| 2239 | unsigned char* key, |
| 2240 | size_t keylen) |
| 2241 | { |
| 2242 | #ifdef USE_SHA2 |
| 2243 | EVP_PKEY *evp_key; |
| 2244 | ldns_status result; |
| 2245 | |
| 2246 | evp_key = EVP_PKEY_new(); |
| 2247 | EVP_PKEY_assign_RSA(evp_key, ldns_key_buf2rsa_raw(key, keylen)); |
| 2248 | result = ldns_verify_rrsig_evp_raw(sig, |
| 2249 | siglen, |
| 2250 | rrset, |
| 2251 | evp_key, |
| 2252 | EVP_sha512()); |
| 2253 | EVP_PKEY_free(evp_key); |
| 2254 | |
| 2255 | return result; |
| 2256 | #else |
| 2257 | /* touch these to prevent compiler warnings */ |
| 2258 | (void) sig; |
| 2259 | (void) siglen; |
| 2260 | (void) rrset; |
| 2261 | (void) key; |
| 2262 | (void) keylen; |
| 2263 | return LDNS_STATUS_CRYPTO_UNKNOWN_ALGO; |
| 2264 | #endif |
| 2265 | } |
| 2266 | |
| 2267 | |
| 2268 | ldns_status |
| 2269 | ldns_verify_rrsig_rsamd5_raw(unsigned char* sig, |
| 2270 | size_t siglen, |
| 2271 | ldns_buffer* rrset, |
| 2272 | unsigned char* key, |
| 2273 | size_t keylen) |
| 2274 | { |
| 2275 | EVP_PKEY *evp_key; |
| 2276 | ldns_status result; |
| 2277 | |
| 2278 | evp_key = EVP_PKEY_new(); |
| 2279 | EVP_PKEY_assign_RSA(evp_key, ldns_key_buf2rsa_raw(key, keylen)); |
| 2280 | result = ldns_verify_rrsig_evp_raw(sig, |
| 2281 | siglen, |
| 2282 | rrset, |
| 2283 | evp_key, |
| 2284 | EVP_md5()); |
| 2285 | EVP_PKEY_free(evp_key); |
| 2286 | |
| 2287 | return result; |
| 2288 | } |
| 2289 | |
| 2290 | #endif |