4 * contains the cryptographic function needed for DNSSEC in ldns
5 * The crypto library used is openssl
7 * (c) NLnet Labs, 2004-2008
9 * See the file LICENSE for the license
12 #include <ldns/config.h>
14 #include <ldns/ldns.h>
15 #include <ldns/dnssec.h>
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>
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)
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),
45 ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(candidate))
57 ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig,
58 const ldns_rr_list *rrs)
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)
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);
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! */
97 ldns_dnssec_nsec3_closest_encloser(ldns_rdf *qname,
98 ATTR_UNUSED(ldns_rr_type qtype),
101 /* remember parameters, they must match */
107 ldns_rdf *sname, *hashed_sname, *tmp;
111 bool exact_match_found;
119 ldns_rdf *result = NULL;
122 if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) {
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);
132 sname = ldns_rdf_clone(qname);
137 zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec));
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;
144 hashed_sname = ldns_nsec3_hash_name(sname,
150 status = ldns_dname_cat(hashed_sname, zone_name);
151 if(status != LDNS_STATUS_OK) {
153 ldns_rdf_deep_free(zone_name);
154 ldns_rdf_deep_free(sname);
158 for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) {
159 nsec = ldns_rr_list_rr(nsec3s, nsec_i);
161 /* check values of iterations etc! */
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;
171 if (!exact_match_found && in_range_found) {
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);
178 } else if (exact_match_found && !flag) {
180 ldns_rdf_deep_free(hashed_sname);
186 ldns_rdf_deep_free(hashed_sname);
188 sname = ldns_dname_left_chop(sname);
189 ldns_rdf_deep_free(tmp);
194 ldns_rdf_deep_free(zone_name);
195 ldns_rdf_deep_free(sname);
201 ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt)
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) {
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) {
220 ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt,
226 ldns_rr_list *sigs_covered;
229 sigs = ldns_pkt_rr_list_by_name_and_type(pkt,
232 LDNS_SECTION_ANY_NOQUESTION
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);
239 ldns_rdf_free(rdf_t);
240 ldns_rr_list_deep_free(sigs);
247 ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type)
251 ldns_rr_list *sigs_covered;
254 sigs = ldns_pkt_rr_list_by_type(pkt,
256 LDNS_SECTION_ANY_NOQUESTION
259 t_netorder = htons(type); /* rdf are in network order! */
260 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
263 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
265 ldns_rdf_free(rdf_t);
266 ldns_rr_list_deep_free(sigs);
272 /* used only on the public key RR */
274 ldns_calc_keytag(const ldns_rr *key)
284 if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY &&
285 ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY
290 /* rdata to buf - only put the rdata in a buffer */
291 keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */
295 (void)ldns_rr_rdata2buffer_wire(keybuf, key);
296 /* the current pos in the buffer is the keysize */
297 keysize= ldns_buffer_position(keybuf);
299 ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize);
300 ldns_buffer_free(keybuf);
304 uint16_t ldns_calc_keytag_raw(uint8_t* key, size_t keysize)
313 /* look at the algorithm field, copied from 2535bis */
314 if (key[3] == LDNS_RSAMD5) {
317 memmove(&ac16, key + keysize - 3, 2);
320 return (uint16_t) ac16;
323 for (i = 0; (size_t)i < keysize; ++i) {
324 ac32 += (i & 1) ? key[i] : key[i] << 8;
326 ac32 += (ac32 >> 16) & 0xFFFF;
327 return (uint16_t) (ac32 & 0xFFFF);
333 ldns_key_buf2dsa(ldns_buffer *key)
335 return ldns_key_buf2dsa_raw((unsigned char*)ldns_buffer_begin(key),
336 ldns_buffer_position(key));
340 ldns_key_buf2dsa_raw(unsigned char* key, size_t len)
346 BIGNUM *Q; BIGNUM *P;
347 BIGNUM *G; BIGNUM *Y;
352 length = (64 + T * 8);
358 if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length)
361 Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL);
362 offset += SHA_DIGEST_LENGTH;
364 P = BN_bin2bn(key+offset, (int)length, NULL);
367 G = BN_bin2bn(key+offset, (int)length, NULL);
370 Y = BN_bin2bn(key+offset, (int)length, NULL);
373 /* create the key and set its properties */
374 if(!Q || !P || !G || !Y || !(dsa = DSA_new())) {
390 ldns_key_buf2rsa(ldns_buffer *key)
392 return ldns_key_buf2rsa_raw((unsigned char*)ldns_buffer_begin(key),
393 ldns_buffer_position(key));
397 ldns_key_buf2rsa_raw(unsigned char* key, size_t len)
411 /* need some smart comment here XXX*/
412 /* the exponent is too large so it's places
414 memmove(&int16, key+1, 2);
422 /* key length at least one */
423 if(len < (size_t)offset + exp + 1)
428 if(!exponent) return NULL;
429 (void) BN_bin2bn(key+offset, (int)exp, exponent);
438 /* length of the buffer must match the key length! */
439 (void) BN_bin2bn(key+offset, (int)(len - offset), modulus);
454 ldns_digest_evp(unsigned char* data, unsigned int len, unsigned char* dest,
458 ctx = EVP_MD_CTX_create();
461 if(!EVP_DigestInit_ex(ctx, md, NULL) ||
462 !EVP_DigestUpdate(ctx, data, len) ||
463 !EVP_DigestFinal_ex(ctx, dest, NULL)) {
464 EVP_MD_CTX_destroy(ctx);
467 EVP_MD_CTX_destroy(ctx);
470 #endif /* HAVE_SSL */
473 ldns_key_rr2ds(const ldns_rr *key, ldns_hash h)
480 ldns_buffer *data_buf;
482 const EVP_MD* md = NULL;
485 if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) {
493 ldns_rr_set_type(ds, LDNS_RR_TYPE_DS);
494 ldns_rr_set_owner(ds, ldns_rdf_clone(
495 ldns_rr_owner(key)));
496 ldns_rr_set_ttl(ds, ldns_rr_ttl(key));
497 ldns_rr_set_class(ds, ldns_rr_get_class(key));
502 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH);
509 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA256_DIGEST_LENGTH);
517 (void)ldns_key_EVP_load_gost_id();
518 md = EVP_get_digestbyname("md_gost94");
523 digest = LDNS_XMALLOC(uint8_t, EVP_MD_size(md));
530 /* not implemented */
536 digest = LDNS_XMALLOC(uint8_t, SHA384_DIGEST_LENGTH);
543 /* not implemented */
549 data_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN);
557 keytag = htons(ldns_calc_keytag((ldns_rr*)key));
558 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16,
561 ldns_rr_push_rdf(ds, tmp);
563 /* copy the algorithm field */
564 ldns_rr_push_rdf(ds, ldns_rdf_clone( ldns_rr_rdf(key, 2)));
566 /* digest hash type */
567 sha1hash = (uint8_t)h;
568 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
571 ldns_rr_push_rdf(ds, tmp);
575 tmp = ldns_rdf_clone(ldns_rr_owner(key));
576 ldns_dname2canonical(tmp);
577 if (ldns_rdf2buffer_wire(data_buf, tmp) != LDNS_STATUS_OK) {
579 ldns_buffer_free(data_buf);
581 ldns_rdf_deep_free(tmp);
584 ldns_rdf_deep_free(tmp);
586 /* all the rdata's */
587 if (ldns_rr_rdata2buffer_wire(data_buf,
588 (ldns_rr*)key) != LDNS_STATUS_OK) {
590 ldns_buffer_free(data_buf);
596 (void) ldns_sha1((unsigned char *) ldns_buffer_begin(data_buf),
597 (unsigned int) ldns_buffer_position(data_buf),
598 (unsigned char *) digest);
600 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
601 LDNS_SHA1_DIGEST_LENGTH,
603 ldns_rr_push_rdf(ds, tmp);
607 (void) ldns_sha256((unsigned char *) ldns_buffer_begin(data_buf),
608 (unsigned int) ldns_buffer_position(data_buf),
609 (unsigned char *) digest);
610 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
611 LDNS_SHA256_DIGEST_LENGTH,
613 ldns_rr_push_rdf(ds, tmp);
617 if(!ldns_digest_evp((unsigned char *) ldns_buffer_begin(data_buf),
618 (unsigned int) ldns_buffer_position(data_buf),
619 (unsigned char *) digest, md)) {
621 ldns_buffer_free(data_buf);
625 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
628 ldns_rr_push_rdf(ds, tmp);
633 (void) SHA384((unsigned char *) ldns_buffer_begin(data_buf),
634 (unsigned int) ldns_buffer_position(data_buf),
635 (unsigned char *) digest);
636 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
637 SHA384_DIGEST_LENGTH,
639 ldns_rr_push_rdf(ds, tmp);
645 ldns_buffer_free(data_buf);
650 ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[],
652 ldns_rr_type nsec_type)
658 ldns_rdf *bitmap_rdf;
660 uint8_t *data = NULL;
661 uint8_t cur_data[32];
662 uint8_t cur_window = 0;
663 uint8_t cur_window_max = 0;
664 uint16_t cur_data_size = 0;
666 if (nsec_type != LDNS_RR_TYPE_NSEC &&
667 nsec_type != LDNS_RR_TYPE_NSEC3) {
672 for (i = 0; i < size; i++) {
673 if (i_type < rr_type_list[i])
674 i_type = rr_type_list[i];
676 if (i_type < nsec_type) {
680 bm_len = i_type / 8 + 2;
681 bitmap = LDNS_XMALLOC(uint8_t, bm_len);
682 for (i = 0; i < bm_len; i++) {
686 for (i = 0; i < size; i++) {
687 i_type = rr_type_list[i];
688 ldns_set_bit(bitmap + (int) i_type / 8,
689 (int) (7 - (i_type % 8)),
693 /* fold it into windows TODO: can this be done directly? */
694 memset(cur_data, 0, 32);
695 for (i = 0; i < bm_len; i++) {
696 if (i / 32 > cur_window) {
697 /* check, copy, new */
698 if (cur_window_max > 0) {
699 /* this window has stuff, add it */
700 data = LDNS_XREALLOC(data,
702 cur_data_size + cur_window_max + 3);
703 data[cur_data_size] = cur_window;
704 data[cur_data_size + 1] = cur_window_max + 1;
705 memcpy(data + cur_data_size + 2,
708 cur_data_size += cur_window_max + 3;
712 memset(cur_data, 0, 32);
714 cur_data[i%32] = bitmap[i];
716 cur_window_max = i%32;
719 if (cur_window_max > 0 || cur_data[0] != 0) {
720 /* this window has stuff, add it */
721 data = LDNS_XREALLOC(data,
723 cur_data_size + cur_window_max + 3);
724 data[cur_data_size] = cur_window;
725 data[cur_data_size + 1] = cur_window_max + 1;
726 memcpy(data + cur_data_size + 2, cur_data, cur_window_max+1);
727 cur_data_size += cur_window_max + 3;
730 bitmap_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC,
741 ldns_dnssec_rrsets_contains_type(ldns_dnssec_rrsets *rrsets,
744 ldns_dnssec_rrsets *cur_rrset = rrsets;
746 if (cur_rrset->type == type) {
749 cur_rrset = cur_rrset->next;
754 /* returns true if the current dnssec_rrset from the given list of rrsets
757 is_glue(ldns_dnssec_rrsets *cur_rrsets, ldns_dnssec_rrsets *orig_rrsets)
759 /* only glue if a or aaaa if there are no ns, unless there is soa */
760 return (cur_rrsets->type == LDNS_RR_TYPE_A ||
761 cur_rrsets->type == LDNS_RR_TYPE_AAAA) &&
762 (ldns_dnssec_rrsets_contains_type(orig_rrsets,
764 !ldns_dnssec_rrsets_contains_type(orig_rrsets,
769 ldns_dnssec_create_nsec(ldns_dnssec_name *from,
770 ldns_dnssec_name *to,
771 ldns_rr_type nsec_type)
774 ldns_rr_type types[65535];
775 size_t type_count = 0;
776 ldns_dnssec_rrsets *cur_rrsets;
778 if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC &&
779 nsec_type != LDNS_RR_TYPE_NSEC3)) {
783 nsec_rr = ldns_rr_new();
784 ldns_rr_set_type(nsec_rr, nsec_type);
785 ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from)));
786 ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to)));
788 cur_rrsets = from->rrsets;
790 if (is_glue(cur_rrsets, from->rrsets)) {
791 cur_rrsets = cur_rrsets->next;
794 types[type_count] = cur_rrsets->type;
796 cur_rrsets = cur_rrsets->next;
798 types[type_count] = LDNS_RR_TYPE_RRSIG;
800 types[type_count] = LDNS_RR_TYPE_NSEC;
803 ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types,
811 ldns_dnssec_create_nsec3(ldns_dnssec_name *from,
812 ldns_dnssec_name *to,
821 ldns_rr_type types[65535];
822 size_t type_count = 0;
823 ldns_dnssec_rrsets *cur_rrsets;
832 nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
833 ldns_rr_set_owner(nsec_rr,
834 ldns_nsec3_hash_name(ldns_dnssec_name_name(from),
839 status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name);
840 if(status != LDNS_STATUS_OK) {
841 ldns_rr_free(nsec_rr);
844 ldns_nsec3_add_param_rdfs(nsec_rr,
851 cur_rrsets = from->rrsets;
853 if (is_glue(cur_rrsets, from->rrsets)) {
854 cur_rrsets = cur_rrsets->next;
857 types[type_count] = cur_rrsets->type;
859 cur_rrsets = cur_rrsets->next;
861 /* always add rrsig type if this is not an unsigned
864 if (type_count > 0 &&
865 !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) {
866 types[type_count] = LDNS_RR_TYPE_RRSIG;
870 /* leave next rdata empty if they weren't precomputed yet */
871 if (to && to->hashed_name) {
872 (void) ldns_rr_set_rdf(nsec_rr,
873 ldns_rdf_clone(to->hashed_name),
876 (void) ldns_rr_set_rdf(nsec_rr, NULL, 4);
879 ldns_rr_push_rdf(nsec_rr,
880 ldns_dnssec_create_nsec_bitmap(types,
882 LDNS_RR_TYPE_NSEC3));
888 ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs)
890 /* we do not do any check here - garbage in, garbage out */
892 /* the the start and end names - get the type from the
895 /* inefficient, just give it a name, a next name, and a list of rrs */
896 /* we make 1 big uberbitmap first, then windows */
897 /* todo: make something more efficient :) */
902 ldns_rr *nsec = NULL;
903 ldns_rr_type i_type_list[65535];
906 nsec = ldns_rr_new();
907 ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC);
908 ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner));
909 ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner));
911 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
912 i_rr = ldns_rr_list_rr(rrs, i);
913 if (ldns_rdf_compare(cur_owner,
914 ldns_rr_owner(i_rr)) == 0) {
915 i_type = ldns_rr_get_type(i_rr);
916 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
917 i_type_list[type_count] = i_type;
923 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
925 i_type_list[type_count] = LDNS_RR_TYPE_NSEC;
928 ldns_rr_push_rdf(nsec,
929 ldns_dnssec_create_nsec_bitmap(i_type_list,
930 type_count, LDNS_RR_TYPE_NSEC));
936 ldns_nsec3_hash_name(ldns_rdf *name,
942 size_t hashed_owner_str_len;
944 ldns_rdf *hashed_owner;
945 unsigned char *hashed_owner_str;
946 char *hashed_owner_b32;
947 size_t hashed_owner_b32_len;
949 /* define to contain the largest possible hash, which is
950 * sha1 at the moment */
951 unsigned char hash[LDNS_SHA1_DIGEST_LENGTH];
954 /* prepare the owner name according to the draft section bla */
955 cann = ldns_rdf_clone(name);
957 fprintf(stderr, "Memory error\n");
960 ldns_dname2canonical(cann);
962 /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */
963 algorithm = algorithm;
965 hashed_owner_str_len = salt_length + ldns_rdf_size(cann);
966 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
967 memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann));
968 memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length);
969 ldns_rdf_deep_free(cann);
971 for (cur_it = iterations + 1; cur_it > 0; cur_it--) {
972 (void) ldns_sha1((unsigned char *) hashed_owner_str,
973 (unsigned int) hashed_owner_str_len, hash);
975 LDNS_FREE(hashed_owner_str);
976 hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH;
977 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
978 if (!hashed_owner_str) {
979 fprintf(stderr, "Memory error\n");
982 memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH);
983 memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length);
984 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length;
987 LDNS_FREE(hashed_owner_str);
988 hashed_owner_str = hash;
989 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH;
991 hashed_owner_b32 = LDNS_XMALLOC(char,
992 ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1);
993 hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex(
994 (uint8_t *) hashed_owner_str,
995 hashed_owner_str_len,
997 ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1);
998 if (hashed_owner_b32_len < 1) {
999 fprintf(stderr, "Error in base32 extended hex encoding ");
1000 fprintf(stderr, "of hashed owner name (name: ");
1001 ldns_rdf_print(stderr, name);
1002 fprintf(stderr, ", return code: %u)\n",
1003 (unsigned int) hashed_owner_b32_len);
1004 LDNS_FREE(hashed_owner_b32);
1007 hashed_owner_b32[hashed_owner_b32_len] = '\0';
1009 status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32);
1010 if (status != LDNS_STATUS_OK) {
1011 fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32);
1012 LDNS_FREE(hashed_owner_b32);
1016 LDNS_FREE(hashed_owner_b32);
1017 return hashed_owner;
1021 ldns_nsec3_add_param_rdfs(ldns_rr *rr,
1024 uint16_t iterations,
1025 uint8_t salt_length,
1028 ldns_rdf *salt_rdf = NULL;
1029 uint8_t *salt_data = NULL;
1032 old = ldns_rr_set_rdf(rr,
1033 ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1034 1, (void*)&algorithm),
1036 if (old) ldns_rdf_deep_free(old);
1038 old = ldns_rr_set_rdf(rr,
1039 ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1042 if (old) ldns_rdf_deep_free(old);
1044 old = ldns_rr_set_rdf(rr,
1045 ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
1048 if (old) ldns_rdf_deep_free(old);
1050 salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1);
1051 salt_data[0] = salt_length;
1052 memcpy(salt_data + 1, salt, salt_length);
1053 salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT,
1057 old = ldns_rr_set_rdf(rr, salt_rdf, 3);
1058 if (old) ldns_rdf_deep_free(old);
1059 LDNS_FREE(salt_data);
1063 rr_list_delegation_only(ldns_rdf *origin, ldns_rr_list *rr_list)
1067 if (!origin || !rr_list) return 0;
1068 for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
1069 cur_rr = ldns_rr_list_rr(rr_list, i);
1070 if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) {
1073 if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) {
1080 /* this will NOT return the NSEC3 completed, you will have to run the
1081 finalize function on the rrlist later! */
1083 ldns_create_nsec3(ldns_rdf *cur_owner,
1088 uint16_t iterations,
1089 uint8_t salt_length,
1091 bool emptynonterminal)
1097 ldns_rr *nsec = NULL;
1098 ldns_rdf *hashed_owner = NULL;
1102 ldns_rr_type i_type_list[1024];
1105 hashed_owner = ldns_nsec3_hash_name(cur_owner,
1110 status = ldns_dname_cat(hashed_owner, cur_zone);
1111 if(status != LDNS_STATUS_OK)
1114 nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
1117 ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3);
1118 ldns_rr_set_owner(nsec, hashed_owner);
1120 ldns_nsec3_add_param_rdfs(nsec,
1126 (void) ldns_rr_set_rdf(nsec, NULL, 4);
1129 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
1130 i_rr = ldns_rr_list_rr(rrs, i);
1131 if (ldns_rdf_compare(cur_owner,
1132 ldns_rr_owner(i_rr)) == 0) {
1133 i_type = ldns_rr_get_type(i_rr);
1134 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
1135 i_type_list[type_count] = i_type;
1141 /* add RRSIG anyway, but only if this is not an ENT or
1142 * an unsigned delegation */
1143 if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) {
1144 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
1148 /* and SOA if owner == zone */
1149 if (ldns_dname_compare(cur_zone, cur_owner) == 0) {
1150 i_type_list[type_count] = LDNS_RR_TYPE_SOA;
1154 ldns_rr_push_rdf(nsec,
1155 ldns_dnssec_create_nsec_bitmap(i_type_list,
1156 type_count, LDNS_RR_TYPE_NSEC3));
1162 ldns_nsec3_algorithm(const ldns_rr *nsec3_rr)
1164 if (nsec3_rr && ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 &&
1165 ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0
1167 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0));
1173 ldns_nsec3_flags(const ldns_rr *nsec3_rr)
1175 if (nsec3_rr && ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 &&
1176 ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0
1178 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1));
1184 ldns_nsec3_optout(const ldns_rr *nsec3_rr)
1186 return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK);
1190 ldns_nsec3_iterations(const ldns_rr *nsec3_rr)
1192 if (nsec3_rr && ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 &&
1193 ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0
1195 return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2));
1202 ldns_nsec3_salt(const ldns_rr *nsec3_rr)
1204 if (nsec3_rr && ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3) {
1205 return ldns_rr_rdf(nsec3_rr, 3);
1211 ldns_nsec3_salt_length(const ldns_rr *nsec3_rr)
1213 ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1214 if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1215 return (uint8_t) ldns_rdf_data(salt_rdf)[0];
1220 /* allocs data, free with LDNS_FREE() */
1222 ldns_nsec3_salt_data(const ldns_rr *nsec3_rr)
1224 uint8_t salt_length;
1227 ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1228 if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1229 salt_length = ldns_rdf_data(salt_rdf)[0];
1230 salt = LDNS_XMALLOC(uint8_t, salt_length);
1231 memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length);
1238 ldns_nsec3_next_owner(const ldns_rr *nsec3_rr)
1240 if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1243 return ldns_rr_rdf(nsec3_rr, 4);
1248 ldns_nsec3_bitmap(const ldns_rr *nsec3_rr)
1250 if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1253 return ldns_rr_rdf(nsec3_rr, 5);
1258 ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, ldns_rdf *name)
1261 uint16_t iterations;
1262 uint8_t salt_length;
1265 ldns_rdf *hashed_owner;
1267 algorithm = ldns_nsec3_algorithm(nsec);
1268 salt_length = ldns_nsec3_salt_length(nsec);
1269 salt = ldns_nsec3_salt_data(nsec);
1270 iterations = ldns_nsec3_iterations(nsec);
1272 hashed_owner = ldns_nsec3_hash_name(name,
1279 return hashed_owner;
1283 ldns_nsec_bitmap_covers_type(const ldns_rdf *nsec_bitmap, ldns_rr_type type)
1285 uint8_t window_block_nr;
1286 uint8_t bitmap_length;
1290 uint8_t *data = ldns_rdf_data(nsec_bitmap);
1292 while(pos < ldns_rdf_size(nsec_bitmap)) {
1293 window_block_nr = data[pos];
1294 bitmap_length = data[pos + 1];
1297 for (bit_pos = 0; bit_pos < (bitmap_length) * 8; bit_pos++) {
1298 if (ldns_get_bit(&data[pos], bit_pos)) {
1299 cur_type = 256 * (uint16_t) window_block_nr + bit_pos;
1300 if (cur_type == type) {
1306 pos += (uint16_t) bitmap_length;
1312 ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name)
1314 ldns_rdf *nsec_owner = ldns_rr_owner(nsec);
1315 ldns_rdf *hash_next;
1316 char *next_hash_str;
1317 ldns_rdf *nsec_next = NULL;
1319 ldns_rdf *chopped_dname;
1322 if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
1323 nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0));
1324 } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
1325 hash_next = ldns_nsec3_next_owner(nsec);
1326 next_hash_str = ldns_rdf2str(hash_next);
1327 nsec_next = ldns_dname_new_frm_str(next_hash_str);
1328 LDNS_FREE(next_hash_str);
1329 chopped_dname = ldns_dname_left_chop(nsec_owner);
1330 status = ldns_dname_cat(nsec_next, chopped_dname);
1331 ldns_rdf_deep_free(chopped_dname);
1332 if (status != LDNS_STATUS_OK) {
1333 printf("error catting: %s\n", ldns_get_errorstr_by_id(status));
1336 ldns_rdf_deep_free(nsec_next);
1340 /* in the case of the last nsec */
1341 if(ldns_dname_compare(nsec_owner, nsec_next) > 0) {
1342 result = (ldns_dname_compare(nsec_owner, name) <= 0 ||
1343 ldns_dname_compare(name, nsec_next) < 0);
1345 result = (ldns_dname_compare(nsec_owner, name) <= 0 &&
1346 ldns_dname_compare(name, nsec_next) < 0);
1349 ldns_rdf_deep_free(nsec_next);
1354 /* sig may be null - if so look in the packet */
1356 ldns_pkt_verify(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o,
1357 ldns_rr_list *k, ldns_rr_list *s, ldns_rr_list *good_keys)
1359 ldns_rr_list *rrset;
1361 ldns_rr_list *sigs_covered;
1363 ldns_rr_type t_netorder;
1366 return LDNS_STATUS_ERR;
1367 /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */
1370 if (t == LDNS_RR_TYPE_RRSIG) {
1371 /* we don't have RRSIG(RRSIG) (yet? ;-) ) */
1372 return LDNS_STATUS_ERR;
1376 /* if s is not NULL, the sigs are given to use */
1379 /* otherwise get them from the packet */
1380 sigs = ldns_pkt_rr_list_by_name_and_type(p, o, LDNS_RR_TYPE_RRSIG,
1381 LDNS_SECTION_ANY_NOQUESTION);
1384 return LDNS_STATUS_ERR;
1385 /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */
1389 /* rrsig are subtyped, so now we need to find the correct
1390 * sigs for the type t
1392 t_netorder = htons(t); /* rdf are in network order! */
1393 /* a type identifier is a 16-bit number, so the size is 2 bytes */
1394 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
1397 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
1399 rrset = ldns_pkt_rr_list_by_name_and_type(p,
1402 LDNS_SECTION_ANY_NOQUESTION);
1405 return LDNS_STATUS_ERR;
1408 if (!sigs_covered) {
1409 return LDNS_STATUS_ERR;
1412 return ldns_verify(rrset, sigs, k, good_keys);
1414 #endif /* HAVE_SSL */
1417 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs)
1420 char *next_nsec_owner_str;
1421 ldns_rdf *next_nsec_owner_label;
1422 ldns_rdf *next_nsec_rdf;
1423 ldns_status status = LDNS_STATUS_OK;
1425 for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) {
1426 if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) {
1427 next_nsec_owner_label =
1428 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1430 next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1431 if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1433 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1436 status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1437 next_nsec_owner_str);
1438 if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1439 next_nsec_rdf, 4)) {
1443 ldns_rdf_deep_free(next_nsec_owner_label);
1444 LDNS_FREE(next_nsec_owner_str);
1446 next_nsec_owner_label =
1447 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1450 next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1451 if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1453 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1456 status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1457 next_nsec_owner_str);
1458 ldns_rdf_deep_free(next_nsec_owner_label);
1459 LDNS_FREE(next_nsec_owner_str);
1460 if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1461 next_nsec_rdf, 4)) {
1470 qsort_rr_compare_nsec3(const void *a, const void *b)
1472 const ldns_rr *rr1 = * (const ldns_rr **) a;
1473 const ldns_rr *rr2 = * (const ldns_rr **) b;
1474 if (rr1 == NULL && rr2 == NULL) {
1483 return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2));
1487 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted)
1489 qsort(unsorted->_rrs,
1490 ldns_rr_list_rr_count(unsorted),
1492 qsort_rr_compare_nsec3);
1496 ldns_dnssec_default_add_to_signatures(ldns_rr *sig, void *n)
1500 return LDNS_SIGNATURE_LEAVE_ADD_NEW;
1504 ldns_dnssec_default_leave_signatures(ldns_rr *sig, void *n)
1508 return LDNS_SIGNATURE_LEAVE_NO_ADD;
1512 ldns_dnssec_default_delete_signatures(ldns_rr *sig, void *n)
1516 return LDNS_SIGNATURE_REMOVE_NO_ADD;
1520 ldns_dnssec_default_replace_signatures(ldns_rr *sig, void *n)
1524 return LDNS_SIGNATURE_REMOVE_ADD_NEW;
1529 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig,
1532 ldns_rdf *sigdata_rdf;
1534 unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig);
1537 dsasig = d2i_DSA_SIG(NULL,
1538 (const unsigned char **)&dsasig_data,
1544 dsasig_data = LDNS_XMALLOC(unsigned char, 41);
1546 byte_offset = (size_t) (20 - BN_num_bytes(dsasig->r));
1547 if (byte_offset > 20) {
1550 memset(&dsasig_data[1], 0, byte_offset);
1551 BN_bn2bin(dsasig->r, &dsasig_data[1 + byte_offset]);
1552 byte_offset = (size_t) (20 - BN_num_bytes(dsasig->s));
1553 if (byte_offset > 20) {
1556 memset(&dsasig_data[21], 0, byte_offset);
1557 BN_bn2bin(dsasig->s, &dsasig_data[21 + byte_offset]);
1559 sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data);
1560 DSA_SIG_free(dsasig);
1566 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1567 const ldns_rdf *sig_rdf)
1569 /* the EVP api wants the DER encoding of the signature... */
1572 unsigned char *raw_sig = NULL;
1575 if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH)
1576 return LDNS_STATUS_SYNTAX_RDATA_ERR;
1577 /* extract the R and S field from the sig buffer */
1579 if(!R) return LDNS_STATUS_MEM_ERR;
1580 (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1,
1581 SHA_DIGEST_LENGTH, R);
1585 return LDNS_STATUS_MEM_ERR;
1587 (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21,
1588 SHA_DIGEST_LENGTH, S);
1590 dsasig = DSA_SIG_new();
1594 return LDNS_STATUS_MEM_ERR;
1600 raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig);
1601 if (raw_sig_len < 0) {
1602 DSA_SIG_free(dsasig);
1604 return LDNS_STATUS_SSL_ERR;
1606 if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1607 ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len);
1610 DSA_SIG_free(dsasig);
1613 return ldns_buffer_status(target_buffer);
1618 ldns_convert_ecdsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len)
1620 ECDSA_SIG* ecdsa_sig;
1621 unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1623 ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len);
1624 if(!ecdsa_sig) return NULL;
1627 data = LDNS_XMALLOC(unsigned char,
1628 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s));
1630 ECDSA_SIG_free(ecdsa_sig);
1633 BN_bn2bin(ecdsa_sig->r, data);
1634 BN_bn2bin(ecdsa_sig->s, data+BN_num_bytes(ecdsa_sig->r));
1635 rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64,
1636 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s), data);
1637 ECDSA_SIG_free(ecdsa_sig);
1642 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1643 const ldns_rdf *sig_rdf)
1647 long bnsize = ldns_rdf_size(sig_rdf) / 2;
1648 /* if too short, or not even length, do not bother */
1649 if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf))
1650 return LDNS_STATUS_ERR;
1652 /* use the raw data to parse two evenly long BIGNUMs, "r | s". */
1653 sig = ECDSA_SIG_new();
1654 if(!sig) return LDNS_STATUS_MEM_ERR;
1655 sig->r = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf),
1657 sig->s = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf)+bnsize,
1659 if(!sig->r || !sig->s) {
1660 ECDSA_SIG_free(sig);
1661 return LDNS_STATUS_MEM_ERR;
1664 raw_sig_len = i2d_ECDSA_SIG(sig, NULL);
1665 if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1666 unsigned char* pp = ldns_buffer_current(target_buffer);
1667 raw_sig_len = i2d_ECDSA_SIG(sig, &pp);
1668 ldns_buffer_skip(target_buffer, (size_t) raw_sig_len);
1670 ECDSA_SIG_free(sig);
1672 return ldns_buffer_status(target_buffer);
1675 #endif /* USE_ECDSA */
1676 #endif /* HAVE_SSL */