1 /* 2 * dnssec.c 3 * 4 * contains the cryptographic function needed for DNSSEC in ldns 5 * The crypto library used is openssl 6 * 7 * (c) NLnet Labs, 2004-2008 8 * 9 * See the file LICENSE for the license 10 */ 11 12 #include <ldns/config.h> 13 14 #include <ldns/ldns.h> 15 #include <ldns/dnssec.h> 16 17 #include <strings.h> 18 #include <time.h> 19 20 #ifdef HAVE_SSL 21 #include <openssl/ssl.h> 22 #include <openssl/evp.h> 23 #include <openssl/rand.h> 24 #include <openssl/err.h> 25 #include <openssl/md5.h> 26 #endif 27 28 ldns_rr * 29 ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name, 30 const ldns_rr_type type, 31 const ldns_rr_list *rrs) 32 { 33 size_t i; 34 ldns_rr *candidate; 35 36 if (!name || !rrs) { 37 return NULL; 38 } 39 40 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) { 41 candidate = ldns_rr_list_rr(rrs, i); 42 if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_RRSIG) { 43 if (ldns_dname_compare(ldns_rr_owner(candidate), 44 name) == 0 && 45 ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(candidate)) 46 == type 47 ) { 48 return candidate; 49 } 50 } 51 } 52 53 return NULL; 54 } 55 56 ldns_rr * 57 ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig, 58 const ldns_rr_list *rrs) 59 { 60 size_t i; 61 ldns_rr *candidate; 62 63 if (!rrsig || !rrs) { 64 return NULL; 65 } 66 67 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) { 68 candidate = ldns_rr_list_rr(rrs, i); 69 if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_DNSKEY) { 70 if (ldns_dname_compare(ldns_rr_owner(candidate), 71 ldns_rr_rrsig_signame(rrsig)) == 0 && 72 ldns_rdf2native_int16(ldns_rr_rrsig_keytag(rrsig)) == 73 ldns_calc_keytag(candidate) 74 ) { 75 return candidate; 76 } 77 } 78 } 79 80 return NULL; 81 } 82 83 ldns_rdf * 84 ldns_nsec_get_bitmap(ldns_rr *nsec) { 85 if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) { 86 return ldns_rr_rdf(nsec, 1); 87 } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) { 88 return ldns_rr_rdf(nsec, 5); 89 } else { 90 return NULL; 91 } 92 } 93 94 /*return the owner name of the closest encloser for name from the list of rrs */ 95 /* this is NOT the hash, but the original name! */ 96 ldns_rdf * 97 ldns_dnssec_nsec3_closest_encloser(ldns_rdf *qname, 98 ATTR_UNUSED(ldns_rr_type qtype), 99 ldns_rr_list *nsec3s) 100 { 101 /* remember parameters, they must match */ 102 uint8_t algorithm; 103 uint32_t iterations; 104 uint8_t salt_length; 105 uint8_t *salt; 106 107 ldns_rdf *sname, *hashed_sname, *tmp; 108 ldns_rr *ce; 109 bool flag; 110 111 bool exact_match_found; 112 bool in_range_found; 113 114 ldns_status status; 115 ldns_rdf *zone_name; 116 117 size_t nsec_i; 118 ldns_rr *nsec; 119 ldns_rdf *result = NULL; 120 qtype = qtype; 121 122 if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) { 123 return NULL; 124 } 125 126 nsec = ldns_rr_list_rr(nsec3s, 0); 127 algorithm = ldns_nsec3_algorithm(nsec); 128 salt_length = ldns_nsec3_salt_length(nsec); 129 salt = ldns_nsec3_salt_data(nsec); 130 iterations = ldns_nsec3_iterations(nsec); 131 132 sname = ldns_rdf_clone(qname); 133 134 ce = NULL; 135 flag = false; 136 137 zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec)); 138 139 /* algorithm from nsec3-07 8.3 */ 140 while (ldns_dname_label_count(sname) > 0) { 141 exact_match_found = false; 142 in_range_found = false; 143 144 hashed_sname = ldns_nsec3_hash_name(sname, 145 algorithm, 146 iterations, 147 salt_length, 148 salt); 149 150 status = ldns_dname_cat(hashed_sname, zone_name); 151 if(status != LDNS_STATUS_OK) { 152 LDNS_FREE(salt); 153 ldns_rdf_deep_free(zone_name); 154 ldns_rdf_deep_free(sname); 155 return NULL; 156 } 157 158 for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) { 159 nsec = ldns_rr_list_rr(nsec3s, nsec_i); 160 161 /* check values of iterations etc! */ 162 163 /* exact match? */ 164 if (ldns_dname_compare(ldns_rr_owner(nsec), hashed_sname) == 0) { 165 exact_match_found = true; 166 } else if (ldns_nsec_covers_name(nsec, hashed_sname)) { 167 in_range_found = true; 168 } 169 170 } 171 if (!exact_match_found && in_range_found) { 172 flag = true; 173 } else if (exact_match_found && flag) { 174 result = ldns_rdf_clone(sname); 175 /* RFC 5155: 8.3. 2.** "The proof is complete" */ 176 ldns_rdf_deep_free(hashed_sname); 177 goto done; 178 } else if (exact_match_found && !flag) { 179 /* error! */ 180 ldns_rdf_deep_free(hashed_sname); 181 goto done; 182 } else { 183 flag = false; 184 } 185 186 ldns_rdf_deep_free(hashed_sname); 187 tmp = sname; 188 sname = ldns_dname_left_chop(sname); 189 ldns_rdf_deep_free(tmp); 190 } 191 192 done: 193 LDNS_FREE(salt); 194 ldns_rdf_deep_free(zone_name); 195 ldns_rdf_deep_free(sname); 196 197 return result; 198 } 199 200 bool 201 ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt) 202 { 203 size_t i; 204 for (i = 0; i < ldns_pkt_ancount(pkt); i++) { 205 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_answer(pkt), i)) == 206 LDNS_RR_TYPE_RRSIG) { 207 return true; 208 } 209 } 210 for (i = 0; i < ldns_pkt_nscount(pkt); i++) { 211 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_authority(pkt), i)) == 212 LDNS_RR_TYPE_RRSIG) { 213 return true; 214 } 215 } 216 return false; 217 } 218 219 ldns_rr_list * 220 ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt, 221 ldns_rdf *name, 222 ldns_rr_type type) 223 { 224 uint16_t t_netorder; 225 ldns_rr_list *sigs; 226 ldns_rr_list *sigs_covered; 227 ldns_rdf *rdf_t; 228 229 sigs = ldns_pkt_rr_list_by_name_and_type(pkt, 230 name, 231 LDNS_RR_TYPE_RRSIG, 232 LDNS_SECTION_ANY_NOQUESTION 233 ); 234 235 t_netorder = htons(type); /* rdf are in network order! */ 236 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, LDNS_RDF_SIZE_WORD, &t_netorder); 237 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0); 238 239 ldns_rdf_free(rdf_t); 240 ldns_rr_list_deep_free(sigs); 241 242 return sigs_covered; 243 244 } 245 246 ldns_rr_list * 247 ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type) 248 { 249 uint16_t t_netorder; 250 ldns_rr_list *sigs; 251 ldns_rr_list *sigs_covered; 252 ldns_rdf *rdf_t; 253 254 sigs = ldns_pkt_rr_list_by_type(pkt, 255 LDNS_RR_TYPE_RRSIG, 256 LDNS_SECTION_ANY_NOQUESTION 257 ); 258 259 t_netorder = htons(type); /* rdf are in network order! */ 260 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 261 2, 262 &t_netorder); 263 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0); 264 265 ldns_rdf_free(rdf_t); 266 ldns_rr_list_deep_free(sigs); 267 268 return sigs_covered; 269 270 } 271 272 /* used only on the public key RR */ 273 uint16_t 274 ldns_calc_keytag(const ldns_rr *key) 275 { 276 uint16_t ac16; 277 ldns_buffer *keybuf; 278 size_t keysize; 279 280 if (!key) { 281 return 0; 282 } 283 284 if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY && 285 ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY 286 ) { 287 return 0; 288 } 289 290 /* rdata to buf - only put the rdata in a buffer */ 291 keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */ 292 if (!keybuf) { 293 return 0; 294 } 295 (void)ldns_rr_rdata2buffer_wire(keybuf, key); 296 /* the current pos in the buffer is the keysize */ 297 keysize= ldns_buffer_position(keybuf); 298 299 ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize); 300 ldns_buffer_free(keybuf); 301 return ac16; 302 } 303 304 uint16_t ldns_calc_keytag_raw(uint8_t* key, size_t keysize) 305 { 306 unsigned int i; 307 uint32_t ac32; 308 uint16_t ac16; 309 310 if(keysize < 4) { 311 return 0; 312 } 313 /* look at the algorithm field, copied from 2535bis */ 314 if (key[3] == LDNS_RSAMD5) { 315 ac16 = 0; 316 if (keysize > 4) { 317 memmove(&ac16, key + keysize - 3, 2); 318 } 319 ac16 = ntohs(ac16); 320 return (uint16_t) ac16; 321 } else { 322 ac32 = 0; 323 for (i = 0; (size_t)i < keysize; ++i) { 324 ac32 += (i & 1) ? key[i] : key[i] << 8; 325 } 326 ac32 += (ac32 >> 16) & 0xFFFF; 327 return (uint16_t) (ac32 & 0xFFFF); 328 } 329 } 330 331 #ifdef HAVE_SSL 332 DSA * 333 ldns_key_buf2dsa(ldns_buffer *key) 334 { 335 return ldns_key_buf2dsa_raw((unsigned char*)ldns_buffer_begin(key), 336 ldns_buffer_position(key)); 337 } 338 339 DSA * 340 ldns_key_buf2dsa_raw(unsigned char* key, size_t len) 341 { 342 uint8_t T; 343 uint16_t length; 344 uint16_t offset; 345 DSA *dsa; 346 BIGNUM *Q; BIGNUM *P; 347 BIGNUM *G; BIGNUM *Y; 348 349 if(len == 0) 350 return NULL; 351 T = (uint8_t)key[0]; 352 length = (64 + T * 8); 353 offset = 1; 354 355 if (T > 8) { 356 return NULL; 357 } 358 if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length) 359 return NULL; 360 361 Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL); 362 offset += SHA_DIGEST_LENGTH; 363 364 P = BN_bin2bn(key+offset, (int)length, NULL); 365 offset += length; 366 367 G = BN_bin2bn(key+offset, (int)length, NULL); 368 offset += length; 369 370 Y = BN_bin2bn(key+offset, (int)length, NULL); 371 offset += length; 372 373 /* create the key and set its properties */ 374 if(!Q || !P || !G || !Y || !(dsa = DSA_new())) { 375 BN_free(Q); 376 BN_free(P); 377 BN_free(G); 378 BN_free(Y); 379 return NULL; 380 } 381 #ifndef S_SPLINT_S 382 dsa->p = P; 383 dsa->q = Q; 384 dsa->g = G; 385 dsa->pub_key = Y; 386 #endif /* splint */ 387 388 return dsa; 389 } 390 391 RSA * 392 ldns_key_buf2rsa(ldns_buffer *key) 393 { 394 return ldns_key_buf2rsa_raw((unsigned char*)ldns_buffer_begin(key), 395 ldns_buffer_position(key)); 396 } 397 398 RSA * 399 ldns_key_buf2rsa_raw(unsigned char* key, size_t len) 400 { 401 uint16_t offset; 402 uint16_t exp; 403 uint16_t int16; 404 RSA *rsa; 405 BIGNUM *modulus; 406 BIGNUM *exponent; 407 408 if (len == 0) 409 return NULL; 410 if (key[0] == 0) { 411 if(len < 3) 412 return NULL; 413 /* need some smart comment here XXX*/ 414 /* the exponent is too large so it's places 415 * futher...???? */ 416 memmove(&int16, key+1, 2); 417 exp = ntohs(int16); 418 offset = 3; 419 } else { 420 exp = key[0]; 421 offset = 1; 422 } 423 424 /* key length at least one */ 425 if(len < (size_t)offset + exp + 1) 426 return NULL; 427 428 /* Exponent */ 429 exponent = BN_new(); 430 if(!exponent) return NULL; 431 (void) BN_bin2bn(key+offset, (int)exp, exponent); 432 offset += exp; 433 434 /* Modulus */ 435 modulus = BN_new(); 436 if(!modulus) { 437 BN_free(exponent); 438 return NULL; 439 } 440 /* length of the buffer must match the key length! */ 441 (void) BN_bin2bn(key+offset, (int)(len - offset), modulus); 442 443 rsa = RSA_new(); 444 if(!rsa) { 445 BN_free(exponent); 446 BN_free(modulus); 447 return NULL; 448 } 449 #ifndef S_SPLINT_S 450 rsa->n = modulus; 451 rsa->e = exponent; 452 #endif /* splint */ 453 454 return rsa; 455 } 456 457 int 458 ldns_digest_evp(unsigned char* data, unsigned int len, unsigned char* dest, 459 const EVP_MD* md) 460 { 461 EVP_MD_CTX* ctx; 462 ctx = EVP_MD_CTX_create(); 463 if(!ctx) 464 return false; 465 if(!EVP_DigestInit_ex(ctx, md, NULL) || 466 !EVP_DigestUpdate(ctx, data, len) || 467 !EVP_DigestFinal_ex(ctx, dest, NULL)) { 468 EVP_MD_CTX_destroy(ctx); 469 return false; 470 } 471 EVP_MD_CTX_destroy(ctx); 472 return true; 473 } 474 #endif /* HAVE_SSL */ 475 476 ldns_rr * 477 ldns_key_rr2ds(const ldns_rr *key, ldns_hash h) 478 { 479 ldns_rdf *tmp; 480 ldns_rr *ds; 481 uint16_t keytag; 482 uint8_t sha1hash; 483 uint8_t *digest; 484 ldns_buffer *data_buf; 485 #ifdef USE_GOST 486 const EVP_MD* md = NULL; 487 #endif 488 489 if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) { 490 return NULL; 491 } 492 493 ds = ldns_rr_new(); 494 if (!ds) { 495 return NULL; 496 } 497 ldns_rr_set_type(ds, LDNS_RR_TYPE_DS); 498 ldns_rr_set_owner(ds, ldns_rdf_clone( 499 ldns_rr_owner(key))); 500 ldns_rr_set_ttl(ds, ldns_rr_ttl(key)); 501 ldns_rr_set_class(ds, ldns_rr_get_class(key)); 502 503 switch(h) { 504 default: 505 case LDNS_SHA1: 506 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH); 507 if (!digest) { 508 ldns_rr_free(ds); 509 return NULL; 510 } 511 break; 512 case LDNS_SHA256: 513 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA256_DIGEST_LENGTH); 514 if (!digest) { 515 ldns_rr_free(ds); 516 return NULL; 517 } 518 break; 519 case LDNS_HASH_GOST: 520 #ifdef USE_GOST 521 (void)ldns_key_EVP_load_gost_id(); 522 md = EVP_get_digestbyname("md_gost94"); 523 if(!md) { 524 ldns_rr_free(ds); 525 return NULL; 526 } 527 digest = LDNS_XMALLOC(uint8_t, EVP_MD_size(md)); 528 if (!digest) { 529 ldns_rr_free(ds); 530 return NULL; 531 } 532 break; 533 #else 534 /* not implemented */ 535 ldns_rr_free(ds); 536 return NULL; 537 #endif 538 #ifdef USE_ECDSA 539 case LDNS_SHA384: 540 digest = LDNS_XMALLOC(uint8_t, SHA384_DIGEST_LENGTH); 541 if (!digest) { 542 ldns_rr_free(ds); 543 return NULL; 544 } 545 break; 546 #else 547 /* not implemented */ 548 ldns_rr_free(ds); 549 return NULL; 550 #endif 551 } 552 553 data_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN); 554 if (!data_buf) { 555 LDNS_FREE(digest); 556 ldns_rr_free(ds); 557 return NULL; 558 } 559 560 /* keytag */ 561 keytag = htons(ldns_calc_keytag((ldns_rr*)key)); 562 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16, 563 sizeof(uint16_t), 564 &keytag); 565 ldns_rr_push_rdf(ds, tmp); 566 567 /* copy the algorithm field */ 568 ldns_rr_push_rdf(ds, ldns_rdf_clone( ldns_rr_rdf(key, 2))); 569 570 /* digest hash type */ 571 sha1hash = (uint8_t)h; 572 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8, 573 sizeof(uint8_t), 574 &sha1hash); 575 ldns_rr_push_rdf(ds, tmp); 576 577 /* digest */ 578 /* owner name */ 579 tmp = ldns_rdf_clone(ldns_rr_owner(key)); 580 ldns_dname2canonical(tmp); 581 if (ldns_rdf2buffer_wire(data_buf, tmp) != LDNS_STATUS_OK) { 582 LDNS_FREE(digest); 583 ldns_buffer_free(data_buf); 584 ldns_rr_free(ds); 585 ldns_rdf_deep_free(tmp); 586 return NULL; 587 } 588 ldns_rdf_deep_free(tmp); 589 590 /* all the rdata's */ 591 if (ldns_rr_rdata2buffer_wire(data_buf, 592 (ldns_rr*)key) != LDNS_STATUS_OK) { 593 LDNS_FREE(digest); 594 ldns_buffer_free(data_buf); 595 ldns_rr_free(ds); 596 return NULL; 597 } 598 switch(h) { 599 case LDNS_SHA1: 600 (void) ldns_sha1((unsigned char *) ldns_buffer_begin(data_buf), 601 (unsigned int) ldns_buffer_position(data_buf), 602 (unsigned char *) digest); 603 604 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX, 605 LDNS_SHA1_DIGEST_LENGTH, 606 digest); 607 ldns_rr_push_rdf(ds, tmp); 608 609 break; 610 case LDNS_SHA256: 611 (void) ldns_sha256((unsigned char *) ldns_buffer_begin(data_buf), 612 (unsigned int) ldns_buffer_position(data_buf), 613 (unsigned char *) digest); 614 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX, 615 LDNS_SHA256_DIGEST_LENGTH, 616 digest); 617 ldns_rr_push_rdf(ds, tmp); 618 break; 619 case LDNS_HASH_GOST: 620 #ifdef USE_GOST 621 if(!ldns_digest_evp((unsigned char *) ldns_buffer_begin(data_buf), 622 (unsigned int) ldns_buffer_position(data_buf), 623 (unsigned char *) digest, md)) { 624 LDNS_FREE(digest); 625 ldns_buffer_free(data_buf); 626 ldns_rr_free(ds); 627 return NULL; 628 } 629 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX, 630 (size_t)EVP_MD_size(md), 631 digest); 632 ldns_rr_push_rdf(ds, tmp); 633 #endif 634 break; 635 #ifdef USE_ECDSA 636 case LDNS_SHA384: 637 (void) SHA384((unsigned char *) ldns_buffer_begin(data_buf), 638 (unsigned int) ldns_buffer_position(data_buf), 639 (unsigned char *) digest); 640 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX, 641 SHA384_DIGEST_LENGTH, 642 digest); 643 ldns_rr_push_rdf(ds, tmp); 644 break; 645 #endif 646 } 647 648 LDNS_FREE(digest); 649 ldns_buffer_free(data_buf); 650 return ds; 651 } 652 653 ldns_rdf * 654 ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[], 655 size_t size, 656 ldns_rr_type nsec_type) 657 { 658 size_t i; 659 uint8_t *bitmap; 660 uint16_t bm_len = 0; 661 uint16_t i_type; 662 ldns_rdf *bitmap_rdf; 663 664 uint8_t *data = NULL; 665 uint8_t cur_data[32]; 666 uint8_t cur_window = 0; 667 uint8_t cur_window_max = 0; 668 uint16_t cur_data_size = 0; 669 670 if (nsec_type != LDNS_RR_TYPE_NSEC && 671 nsec_type != LDNS_RR_TYPE_NSEC3) { 672 return NULL; 673 } 674 675 i_type = 0; 676 for (i = 0; i < size; i++) { 677 if (i_type < rr_type_list[i]) 678 i_type = rr_type_list[i]; 679 } 680 if (i_type < nsec_type) { 681 i_type = nsec_type; 682 } 683 684 bm_len = i_type / 8 + 2; 685 bitmap = LDNS_XMALLOC(uint8_t, bm_len); 686 if(!bitmap) return NULL; 687 for (i = 0; i < bm_len; i++) { 688 bitmap[i] = 0; 689 } 690 691 for (i = 0; i < size; i++) { 692 i_type = rr_type_list[i]; 693 ldns_set_bit(bitmap + (int) i_type / 8, 694 (int) (7 - (i_type % 8)), 695 true); 696 } 697 698 /* fold it into windows TODO: can this be done directly? */ 699 memset(cur_data, 0, 32); 700 for (i = 0; i < bm_len; i++) { 701 if (i / 32 > cur_window) { 702 /* check, copy, new */ 703 if (cur_window_max > 0) { 704 /* this window has stuff, add it */ 705 data = LDNS_XREALLOC(data, 706 uint8_t, 707 cur_data_size + cur_window_max + 3); 708 if(!data) { 709 LDNS_FREE(bitmap); 710 return NULL; 711 } 712 data[cur_data_size] = cur_window; 713 data[cur_data_size + 1] = cur_window_max + 1; 714 memcpy(data + cur_data_size + 2, 715 cur_data, 716 cur_window_max+1); 717 cur_data_size += cur_window_max + 3; 718 } 719 cur_window++; 720 cur_window_max = 0; 721 memset(cur_data, 0, 32); 722 } 723 cur_data[i%32] = bitmap[i]; 724 if (bitmap[i] > 0) { 725 cur_window_max = i%32; 726 } 727 } 728 if (cur_window_max > 0 || cur_data[0] != 0) { 729 /* this window has stuff, add it */ 730 data = LDNS_XREALLOC(data, 731 uint8_t, 732 cur_data_size + cur_window_max + 3); 733 if(!data) { 734 LDNS_FREE(bitmap); 735 return NULL; 736 } 737 data[cur_data_size] = cur_window; 738 data[cur_data_size + 1] = cur_window_max + 1; 739 memcpy(data + cur_data_size + 2, cur_data, cur_window_max+1); 740 cur_data_size += cur_window_max + 3; 741 } 742 743 bitmap_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC, 744 cur_data_size, 745 data); 746 747 LDNS_FREE(bitmap); 748 LDNS_FREE(data); 749 750 return bitmap_rdf; 751 } 752 753 int 754 ldns_dnssec_rrsets_contains_type(ldns_dnssec_rrsets *rrsets, 755 ldns_rr_type type) 756 { 757 ldns_dnssec_rrsets *cur_rrset = rrsets; 758 while (cur_rrset) { 759 if (cur_rrset->type == type) { 760 return 1; 761 } 762 cur_rrset = cur_rrset->next; 763 } 764 return 0; 765 } 766 767 /* returns true if the current dnssec_rrset from the given list of rrsets 768 * is glue */ 769 static int 770 is_glue(ldns_dnssec_rrsets *cur_rrsets, ldns_dnssec_rrsets *orig_rrsets) 771 { 772 /* only glue if a or aaaa if there are no ns, unless there is soa */ 773 return (cur_rrsets->type == LDNS_RR_TYPE_A || 774 cur_rrsets->type == LDNS_RR_TYPE_AAAA) && 775 (ldns_dnssec_rrsets_contains_type(orig_rrsets, 776 LDNS_RR_TYPE_NS) && 777 !ldns_dnssec_rrsets_contains_type(orig_rrsets, 778 LDNS_RR_TYPE_SOA)); 779 } 780 781 ldns_rr * 782 ldns_dnssec_create_nsec(ldns_dnssec_name *from, 783 ldns_dnssec_name *to, 784 ldns_rr_type nsec_type) 785 { 786 ldns_rr *nsec_rr; 787 ldns_rr_type types[65536]; 788 size_t type_count = 0; 789 ldns_dnssec_rrsets *cur_rrsets; 790 791 if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC && 792 nsec_type != LDNS_RR_TYPE_NSEC3)) { 793 return NULL; 794 } 795 796 nsec_rr = ldns_rr_new(); 797 ldns_rr_set_type(nsec_rr, nsec_type); 798 ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from))); 799 ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to))); 800 801 cur_rrsets = from->rrsets; 802 while (cur_rrsets) { 803 if (is_glue(cur_rrsets, from->rrsets)) { 804 cur_rrsets = cur_rrsets->next; 805 continue; 806 } 807 if (cur_rrsets->type != LDNS_RR_TYPE_RRSIG && 808 cur_rrsets->type != LDNS_RR_TYPE_NSEC) { 809 types[type_count] = cur_rrsets->type; 810 type_count++; 811 } 812 cur_rrsets = cur_rrsets->next; 813 814 } 815 types[type_count] = LDNS_RR_TYPE_RRSIG; 816 type_count++; 817 types[type_count] = LDNS_RR_TYPE_NSEC; 818 type_count++; 819 820 ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types, 821 type_count, 822 nsec_type)); 823 824 return nsec_rr; 825 } 826 827 ldns_rr * 828 ldns_dnssec_create_nsec3(ldns_dnssec_name *from, 829 ldns_dnssec_name *to, 830 ldns_rdf *zone_name, 831 uint8_t algorithm, 832 uint8_t flags, 833 uint16_t iterations, 834 uint8_t salt_length, 835 uint8_t *salt) 836 { 837 ldns_rr *nsec_rr; 838 ldns_rr_type types[65536]; 839 size_t type_count = 0; 840 ldns_dnssec_rrsets *cur_rrsets; 841 ldns_status status; 842 843 flags = flags; 844 845 if (!from) { 846 return NULL; 847 } 848 849 nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3); 850 ldns_rr_set_owner(nsec_rr, 851 ldns_nsec3_hash_name(ldns_dnssec_name_name(from), 852 algorithm, 853 iterations, 854 salt_length, 855 salt)); 856 status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name); 857 if(status != LDNS_STATUS_OK) { 858 ldns_rr_free(nsec_rr); 859 return NULL; 860 } 861 ldns_nsec3_add_param_rdfs(nsec_rr, 862 algorithm, 863 flags, 864 iterations, 865 salt_length, 866 salt); 867 868 cur_rrsets = from->rrsets; 869 while (cur_rrsets) { 870 if (is_glue(cur_rrsets, from->rrsets)) { 871 cur_rrsets = cur_rrsets->next; 872 continue; 873 } 874 if (cur_rrsets->type != LDNS_RR_TYPE_RRSIG) { 875 types[type_count] = cur_rrsets->type; 876 type_count++; 877 } 878 cur_rrsets = cur_rrsets->next; 879 } 880 /* always add rrsig type if this is not an unsigned 881 * delegation 882 */ 883 if (type_count > 0 && 884 !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) { 885 types[type_count] = LDNS_RR_TYPE_RRSIG; 886 type_count++; 887 } 888 889 /* leave next rdata empty if they weren't precomputed yet */ 890 if (to && to->hashed_name) { 891 (void) ldns_rr_set_rdf(nsec_rr, 892 ldns_rdf_clone(to->hashed_name), 893 4); 894 } else { 895 (void) ldns_rr_set_rdf(nsec_rr, NULL, 4); 896 } 897 898 ldns_rr_push_rdf(nsec_rr, 899 ldns_dnssec_create_nsec_bitmap(types, 900 type_count, 901 LDNS_RR_TYPE_NSEC3)); 902 903 return nsec_rr; 904 } 905 906 ldns_rr * 907 ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs) 908 { 909 /* we do not do any check here - garbage in, garbage out */ 910 911 /* the the start and end names - get the type from the 912 * before rrlist */ 913 914 /* inefficient, just give it a name, a next name, and a list of rrs */ 915 /* we make 1 big uberbitmap first, then windows */ 916 /* todo: make something more efficient :) */ 917 uint16_t i; 918 ldns_rr *i_rr; 919 uint16_t i_type; 920 921 ldns_rr *nsec = NULL; 922 ldns_rr_type i_type_list[65536]; 923 size_t type_count = 0; 924 925 nsec = ldns_rr_new(); 926 ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC); 927 ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner)); 928 ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner)); 929 930 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) { 931 i_rr = ldns_rr_list_rr(rrs, i); 932 if (ldns_rdf_compare(cur_owner, 933 ldns_rr_owner(i_rr)) == 0) { 934 i_type = ldns_rr_get_type(i_rr); 935 if (i_type != LDNS_RR_TYPE_RRSIG && i_type != LDNS_RR_TYPE_NSEC) { 936 if (type_count == 0 || i_type_list[type_count-1] != i_type) { 937 i_type_list[type_count] = i_type; 938 type_count++; 939 } 940 } 941 } 942 } 943 944 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG; 945 type_count++; 946 i_type_list[type_count] = LDNS_RR_TYPE_NSEC; 947 type_count++; 948 949 ldns_rr_push_rdf(nsec, 950 ldns_dnssec_create_nsec_bitmap(i_type_list, 951 type_count, LDNS_RR_TYPE_NSEC)); 952 953 return nsec; 954 } 955 956 ldns_rdf * 957 ldns_nsec3_hash_name(ldns_rdf *name, 958 uint8_t algorithm, 959 uint16_t iterations, 960 uint8_t salt_length, 961 uint8_t *salt) 962 { 963 size_t hashed_owner_str_len; 964 ldns_rdf *cann; 965 ldns_rdf *hashed_owner; 966 unsigned char *hashed_owner_str; 967 char *hashed_owner_b32; 968 size_t hashed_owner_b32_len; 969 uint32_t cur_it; 970 /* define to contain the largest possible hash, which is 971 * sha1 at the moment */ 972 unsigned char hash[LDNS_SHA1_DIGEST_LENGTH]; 973 ldns_status status; 974 975 /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */ 976 if (algorithm != LDNS_SHA1) { 977 return NULL; 978 } 979 980 /* prepare the owner name according to the draft section bla */ 981 cann = ldns_rdf_clone(name); 982 if(!cann) { 983 fprintf(stderr, "Memory error\n"); 984 return NULL; 985 } 986 ldns_dname2canonical(cann); 987 988 hashed_owner_str_len = salt_length + ldns_rdf_size(cann); 989 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len); 990 if(!hashed_owner_str) { 991 ldns_rdf_deep_free(cann); 992 return NULL; 993 } 994 memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann)); 995 memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length); 996 ldns_rdf_deep_free(cann); 997 998 for (cur_it = iterations + 1; cur_it > 0; cur_it--) { 999 (void) ldns_sha1((unsigned char *) hashed_owner_str, 1000 (unsigned int) hashed_owner_str_len, hash); 1001 1002 LDNS_FREE(hashed_owner_str); 1003 hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH; 1004 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len); 1005 if (!hashed_owner_str) { 1006 return NULL; 1007 } 1008 memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH); 1009 memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length); 1010 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length; 1011 } 1012 1013 LDNS_FREE(hashed_owner_str); 1014 hashed_owner_str = hash; 1015 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH; 1016 1017 hashed_owner_b32 = LDNS_XMALLOC(char, 1018 ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1); 1019 if(!hashed_owner_b32) { 1020 return NULL; 1021 } 1022 hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex( 1023 (uint8_t *) hashed_owner_str, 1024 hashed_owner_str_len, 1025 hashed_owner_b32, 1026 ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1); 1027 if (hashed_owner_b32_len < 1) { 1028 fprintf(stderr, "Error in base32 extended hex encoding "); 1029 fprintf(stderr, "of hashed owner name (name: "); 1030 ldns_rdf_print(stderr, name); 1031 fprintf(stderr, ", return code: %u)\n", 1032 (unsigned int) hashed_owner_b32_len); 1033 LDNS_FREE(hashed_owner_b32); 1034 return NULL; 1035 } 1036 hashed_owner_b32[hashed_owner_b32_len] = '\0'; 1037 1038 status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32); 1039 if (status != LDNS_STATUS_OK) { 1040 fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32); 1041 LDNS_FREE(hashed_owner_b32); 1042 return NULL; 1043 } 1044 1045 LDNS_FREE(hashed_owner_b32); 1046 return hashed_owner; 1047 } 1048 1049 void 1050 ldns_nsec3_add_param_rdfs(ldns_rr *rr, 1051 uint8_t algorithm, 1052 uint8_t flags, 1053 uint16_t iterations, 1054 uint8_t salt_length, 1055 uint8_t *salt) 1056 { 1057 ldns_rdf *salt_rdf = NULL; 1058 uint8_t *salt_data = NULL; 1059 ldns_rdf *old; 1060 1061 old = ldns_rr_set_rdf(rr, 1062 ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8, 1063 1, (void*)&algorithm), 1064 0); 1065 if (old) ldns_rdf_deep_free(old); 1066 1067 old = ldns_rr_set_rdf(rr, 1068 ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8, 1069 1, (void*)&flags), 1070 1); 1071 if (old) ldns_rdf_deep_free(old); 1072 1073 old = ldns_rr_set_rdf(rr, 1074 ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16, 1075 iterations), 1076 2); 1077 if (old) ldns_rdf_deep_free(old); 1078 1079 salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1); 1080 if(!salt_data) { 1081 /* no way to return error */ 1082 return; 1083 } 1084 salt_data[0] = salt_length; 1085 memcpy(salt_data + 1, salt, salt_length); 1086 salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT, 1087 salt_length + 1, 1088 salt_data); 1089 if(!salt_rdf) { 1090 LDNS_FREE(salt_data); 1091 /* no way to return error */ 1092 return; 1093 } 1094 1095 old = ldns_rr_set_rdf(rr, salt_rdf, 3); 1096 if (old) ldns_rdf_deep_free(old); 1097 LDNS_FREE(salt_data); 1098 } 1099 1100 static int 1101 rr_list_delegation_only(ldns_rdf *origin, ldns_rr_list *rr_list) 1102 { 1103 size_t i; 1104 ldns_rr *cur_rr; 1105 if (!origin || !rr_list) return 0; 1106 for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) { 1107 cur_rr = ldns_rr_list_rr(rr_list, i); 1108 if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) { 1109 return 0; 1110 } 1111 if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) { 1112 return 0; 1113 } 1114 } 1115 return 1; 1116 } 1117 1118 /* this will NOT return the NSEC3 completed, you will have to run the 1119 finalize function on the rrlist later! */ 1120 ldns_rr * 1121 ldns_create_nsec3(ldns_rdf *cur_owner, 1122 ldns_rdf *cur_zone, 1123 ldns_rr_list *rrs, 1124 uint8_t algorithm, 1125 uint8_t flags, 1126 uint16_t iterations, 1127 uint8_t salt_length, 1128 uint8_t *salt, 1129 bool emptynonterminal) 1130 { 1131 size_t i; 1132 ldns_rr *i_rr; 1133 uint16_t i_type; 1134 1135 ldns_rr *nsec = NULL; 1136 ldns_rdf *hashed_owner = NULL; 1137 1138 ldns_status status; 1139 1140 ldns_rr_type i_type_list[1024]; 1141 size_t type_count = 0; 1142 1143 hashed_owner = ldns_nsec3_hash_name(cur_owner, 1144 algorithm, 1145 iterations, 1146 salt_length, 1147 salt); 1148 status = ldns_dname_cat(hashed_owner, cur_zone); 1149 if(status != LDNS_STATUS_OK) 1150 return NULL; 1151 1152 nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3); 1153 if(!nsec) 1154 return NULL; 1155 ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3); 1156 ldns_rr_set_owner(nsec, hashed_owner); 1157 1158 ldns_nsec3_add_param_rdfs(nsec, 1159 algorithm, 1160 flags, 1161 iterations, 1162 salt_length, 1163 salt); 1164 (void) ldns_rr_set_rdf(nsec, NULL, 4); 1165 1166 1167 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) { 1168 i_rr = ldns_rr_list_rr(rrs, i); 1169 if (ldns_rdf_compare(cur_owner, 1170 ldns_rr_owner(i_rr)) == 0) { 1171 i_type = ldns_rr_get_type(i_rr); 1172 if (type_count == 0 || i_type_list[type_count-1] != i_type) { 1173 i_type_list[type_count] = i_type; 1174 type_count++; 1175 } 1176 } 1177 } 1178 1179 /* add RRSIG anyway, but only if this is not an ENT or 1180 * an unsigned delegation */ 1181 if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) { 1182 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG; 1183 type_count++; 1184 } 1185 1186 /* and SOA if owner == zone */ 1187 if (ldns_dname_compare(cur_zone, cur_owner) == 0) { 1188 i_type_list[type_count] = LDNS_RR_TYPE_SOA; 1189 type_count++; 1190 } 1191 1192 ldns_rr_push_rdf(nsec, 1193 ldns_dnssec_create_nsec_bitmap(i_type_list, 1194 type_count, LDNS_RR_TYPE_NSEC3)); 1195 1196 return nsec; 1197 } 1198 1199 uint8_t 1200 ldns_nsec3_algorithm(const ldns_rr *nsec3_rr) 1201 { 1202 if (nsec3_rr && ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 && 1203 ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0 1204 ) { 1205 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0)); 1206 } 1207 return 0; 1208 } 1209 1210 uint8_t 1211 ldns_nsec3_flags(const ldns_rr *nsec3_rr) 1212 { 1213 if (nsec3_rr && ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 && 1214 ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0 1215 ) { 1216 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1)); 1217 } 1218 return 0; 1219 } 1220 1221 bool 1222 ldns_nsec3_optout(const ldns_rr *nsec3_rr) 1223 { 1224 return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK); 1225 } 1226 1227 uint16_t 1228 ldns_nsec3_iterations(const ldns_rr *nsec3_rr) 1229 { 1230 if (nsec3_rr && ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 && 1231 ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0 1232 ) { 1233 return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2)); 1234 } 1235 return 0; 1236 1237 } 1238 1239 ldns_rdf * 1240 ldns_nsec3_salt(const ldns_rr *nsec3_rr) 1241 { 1242 if (nsec3_rr && ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3) { 1243 return ldns_rr_rdf(nsec3_rr, 3); 1244 } 1245 return NULL; 1246 } 1247 1248 uint8_t 1249 ldns_nsec3_salt_length(const ldns_rr *nsec3_rr) 1250 { 1251 ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr); 1252 if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) { 1253 return (uint8_t) ldns_rdf_data(salt_rdf)[0]; 1254 } 1255 return 0; 1256 } 1257 1258 /* allocs data, free with LDNS_FREE() */ 1259 uint8_t * 1260 ldns_nsec3_salt_data(const ldns_rr *nsec3_rr) 1261 { 1262 uint8_t salt_length; 1263 uint8_t *salt; 1264 1265 ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr); 1266 if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) { 1267 salt_length = ldns_rdf_data(salt_rdf)[0]; 1268 salt = LDNS_XMALLOC(uint8_t, salt_length); 1269 if(!salt) return NULL; 1270 memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length); 1271 return salt; 1272 } 1273 return NULL; 1274 } 1275 1276 ldns_rdf * 1277 ldns_nsec3_next_owner(const ldns_rr *nsec3_rr) 1278 { 1279 if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) { 1280 return NULL; 1281 } else { 1282 return ldns_rr_rdf(nsec3_rr, 4); 1283 } 1284 } 1285 1286 ldns_rdf * 1287 ldns_nsec3_bitmap(const ldns_rr *nsec3_rr) 1288 { 1289 if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) { 1290 return NULL; 1291 } else { 1292 return ldns_rr_rdf(nsec3_rr, 5); 1293 } 1294 } 1295 1296 ldns_rdf * 1297 ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, ldns_rdf *name) 1298 { 1299 uint8_t algorithm; 1300 uint16_t iterations; 1301 uint8_t salt_length; 1302 uint8_t *salt = 0; 1303 1304 ldns_rdf *hashed_owner; 1305 1306 algorithm = ldns_nsec3_algorithm(nsec); 1307 salt_length = ldns_nsec3_salt_length(nsec); 1308 salt = ldns_nsec3_salt_data(nsec); 1309 iterations = ldns_nsec3_iterations(nsec); 1310 1311 hashed_owner = ldns_nsec3_hash_name(name, 1312 algorithm, 1313 iterations, 1314 salt_length, 1315 salt); 1316 1317 LDNS_FREE(salt); 1318 return hashed_owner; 1319 } 1320 1321 bool 1322 ldns_nsec_bitmap_covers_type(const ldns_rdf *nsec_bitmap, ldns_rr_type type) 1323 { 1324 uint8_t window_block_nr; 1325 uint8_t bitmap_length; 1326 uint16_t cur_type; 1327 uint16_t pos = 0; 1328 uint16_t bit_pos; 1329 uint8_t *data = ldns_rdf_data(nsec_bitmap); 1330 1331 while(pos < ldns_rdf_size(nsec_bitmap)) { 1332 window_block_nr = data[pos]; 1333 bitmap_length = data[pos + 1]; 1334 pos += 2; 1335 1336 for (bit_pos = 0; bit_pos < (bitmap_length) * 8; bit_pos++) { 1337 if (ldns_get_bit(&data[pos], bit_pos)) { 1338 cur_type = 256 * (uint16_t) window_block_nr + bit_pos; 1339 if (cur_type == type) { 1340 return true; 1341 } 1342 } 1343 } 1344 1345 pos += (uint16_t) bitmap_length; 1346 } 1347 return false; 1348 } 1349 1350 bool 1351 ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name) 1352 { 1353 ldns_rdf *nsec_owner = ldns_rr_owner(nsec); 1354 ldns_rdf *hash_next; 1355 char *next_hash_str; 1356 ldns_rdf *nsec_next = NULL; 1357 ldns_status status; 1358 ldns_rdf *chopped_dname; 1359 bool result; 1360 1361 if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) { 1362 nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0)); 1363 } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) { 1364 hash_next = ldns_nsec3_next_owner(nsec); 1365 next_hash_str = ldns_rdf2str(hash_next); 1366 nsec_next = ldns_dname_new_frm_str(next_hash_str); 1367 LDNS_FREE(next_hash_str); 1368 chopped_dname = ldns_dname_left_chop(nsec_owner); 1369 status = ldns_dname_cat(nsec_next, chopped_dname); 1370 ldns_rdf_deep_free(chopped_dname); 1371 if (status != LDNS_STATUS_OK) { 1372 printf("error catting: %s\n", ldns_get_errorstr_by_id(status)); 1373 } 1374 } else { 1375 ldns_rdf_deep_free(nsec_next); 1376 return false; 1377 } 1378 1379 /* in the case of the last nsec */ 1380 if(ldns_dname_compare(nsec_owner, nsec_next) > 0) { 1381 result = (ldns_dname_compare(nsec_owner, name) <= 0 || 1382 ldns_dname_compare(name, nsec_next) < 0); 1383 } else { 1384 result = (ldns_dname_compare(nsec_owner, name) <= 0 && 1385 ldns_dname_compare(name, nsec_next) < 0); 1386 } 1387 1388 ldns_rdf_deep_free(nsec_next); 1389 return result; 1390 } 1391 1392 #ifdef HAVE_SSL 1393 /* sig may be null - if so look in the packet */ 1394 ldns_status 1395 ldns_pkt_verify(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, 1396 ldns_rr_list *k, ldns_rr_list *s, ldns_rr_list *good_keys) 1397 { 1398 ldns_rr_list *rrset; 1399 ldns_rr_list *sigs; 1400 ldns_rr_list *sigs_covered; 1401 ldns_rdf *rdf_t; 1402 ldns_rr_type t_netorder; 1403 1404 if (!k) { 1405 return LDNS_STATUS_ERR; 1406 /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */ 1407 } 1408 1409 if (t == LDNS_RR_TYPE_RRSIG) { 1410 /* we don't have RRSIG(RRSIG) (yet? ;-) ) */ 1411 return LDNS_STATUS_ERR; 1412 } 1413 1414 if (s) { 1415 /* if s is not NULL, the sigs are given to use */ 1416 sigs = s; 1417 } else { 1418 /* otherwise get them from the packet */ 1419 sigs = ldns_pkt_rr_list_by_name_and_type(p, o, LDNS_RR_TYPE_RRSIG, 1420 LDNS_SECTION_ANY_NOQUESTION); 1421 if (!sigs) { 1422 /* no sigs */ 1423 return LDNS_STATUS_ERR; 1424 /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */ 1425 } 1426 } 1427 1428 /* rrsig are subtyped, so now we need to find the correct 1429 * sigs for the type t 1430 */ 1431 t_netorder = htons(t); /* rdf are in network order! */ 1432 /* a type identifier is a 16-bit number, so the size is 2 bytes */ 1433 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 1434 2, 1435 &t_netorder); 1436 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0); 1437 1438 rrset = ldns_pkt_rr_list_by_name_and_type(p, 1439 o, 1440 t, 1441 LDNS_SECTION_ANY_NOQUESTION); 1442 1443 if (!rrset) { 1444 return LDNS_STATUS_ERR; 1445 } 1446 1447 if (!sigs_covered) { 1448 return LDNS_STATUS_ERR; 1449 } 1450 1451 return ldns_verify(rrset, sigs, k, good_keys); 1452 } 1453 #endif /* HAVE_SSL */ 1454 1455 ldns_status 1456 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs) 1457 { 1458 size_t i; 1459 char *next_nsec_owner_str; 1460 ldns_rdf *next_nsec_owner_label; 1461 ldns_rdf *next_nsec_rdf; 1462 ldns_status status = LDNS_STATUS_OK; 1463 1464 for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) { 1465 if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) { 1466 next_nsec_owner_label = 1467 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs, 1468 0)), 0); 1469 next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label); 1470 if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1] 1471 == '.') { 1472 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1] 1473 = '\0'; 1474 } 1475 status = ldns_str2rdf_b32_ext(&next_nsec_rdf, 1476 next_nsec_owner_str); 1477 if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i), 1478 next_nsec_rdf, 4)) { 1479 /* todo: error */ 1480 } 1481 1482 ldns_rdf_deep_free(next_nsec_owner_label); 1483 LDNS_FREE(next_nsec_owner_str); 1484 } else { 1485 next_nsec_owner_label = 1486 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs, 1487 i + 1)), 1488 0); 1489 next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label); 1490 if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1] 1491 == '.') { 1492 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1] 1493 = '\0'; 1494 } 1495 status = ldns_str2rdf_b32_ext(&next_nsec_rdf, 1496 next_nsec_owner_str); 1497 ldns_rdf_deep_free(next_nsec_owner_label); 1498 LDNS_FREE(next_nsec_owner_str); 1499 if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i), 1500 next_nsec_rdf, 4)) { 1501 /* todo: error */ 1502 } 1503 } 1504 } 1505 return status; 1506 } 1507 1508 int 1509 qsort_rr_compare_nsec3(const void *a, const void *b) 1510 { 1511 const ldns_rr *rr1 = * (const ldns_rr **) a; 1512 const ldns_rr *rr2 = * (const ldns_rr **) b; 1513 if (rr1 == NULL && rr2 == NULL) { 1514 return 0; 1515 } 1516 if (rr1 == NULL) { 1517 return -1; 1518 } 1519 if (rr2 == NULL) { 1520 return 1; 1521 } 1522 return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2)); 1523 } 1524 1525 void 1526 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted) 1527 { 1528 qsort(unsorted->_rrs, 1529 ldns_rr_list_rr_count(unsorted), 1530 sizeof(ldns_rr *), 1531 qsort_rr_compare_nsec3); 1532 } 1533 1534 int 1535 ldns_dnssec_default_add_to_signatures(ldns_rr *sig, void *n) 1536 { 1537 sig = sig; 1538 n = n; 1539 return LDNS_SIGNATURE_LEAVE_ADD_NEW; 1540 } 1541 1542 int 1543 ldns_dnssec_default_leave_signatures(ldns_rr *sig, void *n) 1544 { 1545 sig = sig; 1546 n = n; 1547 return LDNS_SIGNATURE_LEAVE_NO_ADD; 1548 } 1549 1550 int 1551 ldns_dnssec_default_delete_signatures(ldns_rr *sig, void *n) 1552 { 1553 sig = sig; 1554 n = n; 1555 return LDNS_SIGNATURE_REMOVE_NO_ADD; 1556 } 1557 1558 int 1559 ldns_dnssec_default_replace_signatures(ldns_rr *sig, void *n) 1560 { 1561 sig = sig; 1562 n = n; 1563 return LDNS_SIGNATURE_REMOVE_ADD_NEW; 1564 } 1565 1566 #ifdef HAVE_SSL 1567 ldns_rdf * 1568 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig, 1569 const long sig_len) 1570 { 1571 ldns_rdf *sigdata_rdf; 1572 DSA_SIG *dsasig; 1573 unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig); 1574 size_t byte_offset; 1575 1576 dsasig = d2i_DSA_SIG(NULL, 1577 (const unsigned char **)&dsasig_data, 1578 sig_len); 1579 if (!dsasig) { 1580 DSA_SIG_free(dsasig); 1581 return NULL; 1582 } 1583 1584 dsasig_data = LDNS_XMALLOC(unsigned char, 41); 1585 if(!dsasig_data) { 1586 DSA_SIG_free(dsasig); 1587 return NULL; 1588 } 1589 dsasig_data[0] = 0; 1590 byte_offset = (size_t) (20 - BN_num_bytes(dsasig->r)); 1591 if (byte_offset > 20) { 1592 DSA_SIG_free(dsasig); 1593 LDNS_FREE(dsasig_data); 1594 return NULL; 1595 } 1596 memset(&dsasig_data[1], 0, byte_offset); 1597 BN_bn2bin(dsasig->r, &dsasig_data[1 + byte_offset]); 1598 byte_offset = (size_t) (20 - BN_num_bytes(dsasig->s)); 1599 if (byte_offset > 20) { 1600 DSA_SIG_free(dsasig); 1601 LDNS_FREE(dsasig_data); 1602 return NULL; 1603 } 1604 memset(&dsasig_data[21], 0, byte_offset); 1605 BN_bn2bin(dsasig->s, &dsasig_data[21 + byte_offset]); 1606 1607 sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data); 1608 if(!sigdata_rdf) { 1609 LDNS_FREE(dsasig_data); 1610 } 1611 DSA_SIG_free(dsasig); 1612 1613 return sigdata_rdf; 1614 } 1615 1616 ldns_status 1617 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer, 1618 const ldns_rdf *sig_rdf) 1619 { 1620 /* the EVP api wants the DER encoding of the signature... */ 1621 BIGNUM *R, *S; 1622 DSA_SIG *dsasig; 1623 unsigned char *raw_sig = NULL; 1624 int raw_sig_len; 1625 1626 if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH) 1627 return LDNS_STATUS_SYNTAX_RDATA_ERR; 1628 /* extract the R and S field from the sig buffer */ 1629 R = BN_new(); 1630 if(!R) return LDNS_STATUS_MEM_ERR; 1631 (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1, 1632 SHA_DIGEST_LENGTH, R); 1633 S = BN_new(); 1634 if(!S) { 1635 BN_free(R); 1636 return LDNS_STATUS_MEM_ERR; 1637 } 1638 (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21, 1639 SHA_DIGEST_LENGTH, S); 1640 1641 dsasig = DSA_SIG_new(); 1642 if (!dsasig) { 1643 BN_free(R); 1644 BN_free(S); 1645 return LDNS_STATUS_MEM_ERR; 1646 } 1647 1648 dsasig->r = R; 1649 dsasig->s = S; 1650 1651 raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig); 1652 if (raw_sig_len < 0) { 1653 DSA_SIG_free(dsasig); 1654 free(raw_sig); 1655 return LDNS_STATUS_SSL_ERR; 1656 } 1657 if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) { 1658 ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len); 1659 } 1660 1661 DSA_SIG_free(dsasig); 1662 free(raw_sig); 1663 1664 return ldns_buffer_status(target_buffer); 1665 } 1666 1667 #ifdef USE_ECDSA 1668 #ifndef S_SPLINT_S 1669 ldns_rdf * 1670 ldns_convert_ecdsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len) 1671 { 1672 ECDSA_SIG* ecdsa_sig; 1673 unsigned char *data = (unsigned char*)ldns_buffer_begin(sig); 1674 ldns_rdf* rdf; 1675 ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len); 1676 if(!ecdsa_sig) return NULL; 1677 1678 /* "r | s". */ 1679 data = LDNS_XMALLOC(unsigned char, 1680 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s)); 1681 if(!data) { 1682 ECDSA_SIG_free(ecdsa_sig); 1683 return NULL; 1684 } 1685 BN_bn2bin(ecdsa_sig->r, data); 1686 BN_bn2bin(ecdsa_sig->s, data+BN_num_bytes(ecdsa_sig->r)); 1687 rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, (size_t)( 1688 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s)), data); 1689 ECDSA_SIG_free(ecdsa_sig); 1690 return rdf; 1691 } 1692 1693 ldns_status 1694 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer, 1695 const ldns_rdf *sig_rdf) 1696 { 1697 ECDSA_SIG* sig; 1698 int raw_sig_len; 1699 long bnsize = (long)ldns_rdf_size(sig_rdf) / 2; 1700 /* if too short, or not even length, do not bother */ 1701 if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf)) 1702 return LDNS_STATUS_ERR; 1703 1704 /* use the raw data to parse two evenly long BIGNUMs, "r | s". */ 1705 sig = ECDSA_SIG_new(); 1706 if(!sig) return LDNS_STATUS_MEM_ERR; 1707 sig->r = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf), 1708 bnsize, sig->r); 1709 sig->s = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf)+bnsize, 1710 bnsize, sig->s); 1711 if(!sig->r || !sig->s) { 1712 ECDSA_SIG_free(sig); 1713 return LDNS_STATUS_MEM_ERR; 1714 } 1715 1716 raw_sig_len = i2d_ECDSA_SIG(sig, NULL); 1717 if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) { 1718 unsigned char* pp = (unsigned char*) 1719 ldns_buffer_current(target_buffer); 1720 raw_sig_len = i2d_ECDSA_SIG(sig, &pp); 1721 ldns_buffer_skip(target_buffer, (ssize_t) raw_sig_len); 1722 } 1723 ECDSA_SIG_free(sig); 1724 1725 return ldns_buffer_status(target_buffer); 1726 } 1727 1728 #endif /* S_SPLINT_S */ 1729 #endif /* USE_ECDSA */ 1730 #endif /* HAVE_SSL */ 1731