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(const 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(const ldns_rdf *qname,
98 ATTR_UNUSED(ldns_rr_type qtype),
99 const ldns_rr_list *nsec3s)
101 /* remember parameters, they must match */
107 ldns_rdf *sname, *hashed_sname, *tmp;
110 bool exact_match_found;
118 ldns_rdf *result = NULL;
120 if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) {
124 nsec = ldns_rr_list_rr(nsec3s, 0);
125 algorithm = ldns_nsec3_algorithm(nsec);
126 salt_length = ldns_nsec3_salt_length(nsec);
127 salt = ldns_nsec3_salt_data(nsec);
128 iterations = ldns_nsec3_iterations(nsec);
130 sname = ldns_rdf_clone(qname);
134 zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec));
136 /* algorithm from nsec3-07 8.3 */
137 while (ldns_dname_label_count(sname) > 0) {
138 exact_match_found = false;
139 in_range_found = false;
141 hashed_sname = ldns_nsec3_hash_name(sname,
147 status = ldns_dname_cat(hashed_sname, zone_name);
148 if(status != LDNS_STATUS_OK) {
150 ldns_rdf_deep_free(zone_name);
151 ldns_rdf_deep_free(sname);
155 for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) {
156 nsec = ldns_rr_list_rr(nsec3s, nsec_i);
158 /* check values of iterations etc! */
161 if (ldns_dname_compare(ldns_rr_owner(nsec), hashed_sname) == 0) {
162 exact_match_found = true;
163 } else if (ldns_nsec_covers_name(nsec, hashed_sname)) {
164 in_range_found = true;
168 if (!exact_match_found && in_range_found) {
170 } else if (exact_match_found && flag) {
171 result = ldns_rdf_clone(sname);
172 /* RFC 5155: 8.3. 2.** "The proof is complete" */
173 ldns_rdf_deep_free(hashed_sname);
175 } else if (exact_match_found && !flag) {
177 ldns_rdf_deep_free(hashed_sname);
183 ldns_rdf_deep_free(hashed_sname);
185 sname = ldns_dname_left_chop(sname);
186 ldns_rdf_deep_free(tmp);
191 ldns_rdf_deep_free(zone_name);
192 ldns_rdf_deep_free(sname);
198 ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt)
201 for (i = 0; i < ldns_pkt_ancount(pkt); i++) {
202 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_answer(pkt), i)) ==
203 LDNS_RR_TYPE_RRSIG) {
207 for (i = 0; i < ldns_pkt_nscount(pkt); i++) {
208 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_authority(pkt), i)) ==
209 LDNS_RR_TYPE_RRSIG) {
217 ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt,
218 const ldns_rdf *name,
223 ldns_rr_list *sigs_covered;
226 sigs = ldns_pkt_rr_list_by_name_and_type(pkt,
229 LDNS_SECTION_ANY_NOQUESTION
232 t_netorder = htons(type); /* rdf are in network order! */
233 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, LDNS_RDF_SIZE_WORD, &t_netorder);
234 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
236 ldns_rdf_free(rdf_t);
237 ldns_rr_list_deep_free(sigs);
244 ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type)
248 ldns_rr_list *sigs_covered;
251 sigs = ldns_pkt_rr_list_by_type(pkt,
253 LDNS_SECTION_ANY_NOQUESTION
256 t_netorder = htons(type); /* rdf are in network order! */
257 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
260 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
262 ldns_rdf_free(rdf_t);
263 ldns_rr_list_deep_free(sigs);
269 /* used only on the public key RR */
271 ldns_calc_keytag(const ldns_rr *key)
281 if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY &&
282 ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY
287 /* rdata to buf - only put the rdata in a buffer */
288 keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */
292 (void)ldns_rr_rdata2buffer_wire(keybuf, key);
293 /* the current pos in the buffer is the keysize */
294 keysize= ldns_buffer_position(keybuf);
296 ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize);
297 ldns_buffer_free(keybuf);
301 uint16_t ldns_calc_keytag_raw(const uint8_t* key, size_t keysize)
310 /* look at the algorithm field, copied from 2535bis */
311 if (key[3] == LDNS_RSAMD5) {
314 memmove(&ac16, key + keysize - 3, 2);
317 return (uint16_t) ac16;
320 for (i = 0; (size_t)i < keysize; ++i) {
321 ac32 += (i & 1) ? key[i] : key[i] << 8;
323 ac32 += (ac32 >> 16) & 0xFFFF;
324 return (uint16_t) (ac32 & 0xFFFF);
330 ldns_key_buf2dsa(const ldns_buffer *key)
332 return ldns_key_buf2dsa_raw((const unsigned char*)ldns_buffer_begin(key),
333 ldns_buffer_position(key));
337 ldns_key_buf2dsa_raw(const unsigned char* key, size_t len)
343 BIGNUM *Q; BIGNUM *P;
344 BIGNUM *G; BIGNUM *Y;
349 length = (64 + T * 8);
355 if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length)
358 Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL);
359 offset += SHA_DIGEST_LENGTH;
361 P = BN_bin2bn(key+offset, (int)length, NULL);
364 G = BN_bin2bn(key+offset, (int)length, NULL);
367 Y = BN_bin2bn(key+offset, (int)length, NULL);
370 /* create the key and set its properties */
371 if(!Q || !P || !G || !Y || !(dsa = DSA_new())) {
378 #if OPENSSL_VERSION_NUMBER < 0x10100000 || defined(HAVE_LIBRESSL)
385 #else /* OPENSSL_VERSION_NUMBER */
386 if (!DSA_set0_pqg(dsa, P, Q, G)) {
387 /* QPG not yet attached, need to free */
396 if (!DSA_set0_key(dsa, Y, NULL)) {
397 /* QPG attached, cleaned up by DSA_fre() */
402 #endif /* OPENSSL_VERSION_NUMBER */
407 ldns_key_buf2rsa(const ldns_buffer *key)
409 return ldns_key_buf2rsa_raw((const unsigned char*)ldns_buffer_begin(key),
410 ldns_buffer_position(key));
414 ldns_key_buf2rsa_raw(const unsigned char* key, size_t len)
428 /* need some smart comment here XXX*/
429 /* the exponent is too large so it's places
431 memmove(&int16, key+1, 2);
439 /* key length at least one */
440 if(len < (size_t)offset + exp + 1)
445 if(!exponent) return NULL;
446 (void) BN_bin2bn(key+offset, (int)exp, exponent);
455 /* length of the buffer must match the key length! */
456 (void) BN_bin2bn(key+offset, (int)(len - offset), modulus);
464 #if OPENSSL_VERSION_NUMBER < 0x10100000 || defined(HAVE_LIBRESSL)
469 #else /* OPENSSL_VERSION_NUMBER */
470 if (!RSA_set0_key(rsa, modulus, exponent, NULL)) {
476 #endif /* OPENSSL_VERSION_NUMBER */
482 ldns_digest_evp(const unsigned char* data, unsigned int len, unsigned char* dest,
486 ctx = EVP_MD_CTX_create();
489 if(!EVP_DigestInit_ex(ctx, md, NULL) ||
490 !EVP_DigestUpdate(ctx, data, len) ||
491 !EVP_DigestFinal_ex(ctx, dest, NULL)) {
492 EVP_MD_CTX_destroy(ctx);
495 EVP_MD_CTX_destroy(ctx);
498 #endif /* HAVE_SSL */
501 ldns_key_rr2ds(const ldns_rr *key, ldns_hash h)
508 ldns_buffer *data_buf;
510 const EVP_MD* md = NULL;
513 if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) {
521 ldns_rr_set_type(ds, LDNS_RR_TYPE_DS);
522 ldns_rr_set_owner(ds, ldns_rdf_clone(
523 ldns_rr_owner(key)));
524 ldns_rr_set_ttl(ds, ldns_rr_ttl(key));
525 ldns_rr_set_class(ds, ldns_rr_get_class(key));
530 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH);
537 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA256_DIGEST_LENGTH);
545 (void)ldns_key_EVP_load_gost_id();
546 md = EVP_get_digestbyname("md_gost94");
551 digest = LDNS_XMALLOC(uint8_t, EVP_MD_size(md));
558 /* not implemented */
564 digest = LDNS_XMALLOC(uint8_t, SHA384_DIGEST_LENGTH);
571 /* not implemented */
577 data_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN);
585 keytag = htons(ldns_calc_keytag((ldns_rr*)key));
586 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16,
589 ldns_rr_push_rdf(ds, tmp);
591 /* copy the algorithm field */
592 if ((tmp = ldns_rr_rdf(key, 2)) == NULL) {
594 ldns_buffer_free(data_buf);
598 ldns_rr_push_rdf(ds, ldns_rdf_clone( tmp ));
601 /* digest hash type */
602 sha1hash = (uint8_t)h;
603 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
606 ldns_rr_push_rdf(ds, tmp);
610 tmp = ldns_rdf_clone(ldns_rr_owner(key));
611 ldns_dname2canonical(tmp);
612 if (ldns_rdf2buffer_wire(data_buf, tmp) != LDNS_STATUS_OK) {
614 ldns_buffer_free(data_buf);
616 ldns_rdf_deep_free(tmp);
619 ldns_rdf_deep_free(tmp);
621 /* all the rdata's */
622 if (ldns_rr_rdata2buffer_wire(data_buf,
623 (ldns_rr*)key) != LDNS_STATUS_OK) {
625 ldns_buffer_free(data_buf);
631 (void) ldns_sha1((unsigned char *) ldns_buffer_begin(data_buf),
632 (unsigned int) ldns_buffer_position(data_buf),
633 (unsigned char *) digest);
635 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
636 LDNS_SHA1_DIGEST_LENGTH,
638 ldns_rr_push_rdf(ds, tmp);
642 (void) ldns_sha256((unsigned char *) ldns_buffer_begin(data_buf),
643 (unsigned int) ldns_buffer_position(data_buf),
644 (unsigned char *) digest);
645 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
646 LDNS_SHA256_DIGEST_LENGTH,
648 ldns_rr_push_rdf(ds, tmp);
652 if(!ldns_digest_evp((unsigned char *) ldns_buffer_begin(data_buf),
653 (unsigned int) ldns_buffer_position(data_buf),
654 (unsigned char *) digest, md)) {
656 ldns_buffer_free(data_buf);
660 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
661 (size_t)EVP_MD_size(md),
663 ldns_rr_push_rdf(ds, tmp);
668 (void) SHA384((unsigned char *) ldns_buffer_begin(data_buf),
669 (unsigned int) ldns_buffer_position(data_buf),
670 (unsigned char *) digest);
671 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
672 SHA384_DIGEST_LENGTH,
674 ldns_rr_push_rdf(ds, tmp);
680 ldns_buffer_free(data_buf);
686 * 2.1.2. The List of Type Bit Map(s) Field
688 * The RR type space is split into 256 window blocks, each representing
689 * the low-order 8 bits of the 16-bit RR type space. Each block that
690 * has at least one active RR type is encoded using a single octet
691 * window number (from 0 to 255), a single octet bitmap length (from 1
692 * to 32) indicating the number of octets used for the window block's
693 * bitmap, and up to 32 octets (256 bits) of bitmap.
695 * Window blocks are present in the NSEC RR RDATA in increasing
698 * "|" denotes concatenation
700 * Type Bit Map(s) Field = ( Window Block # | Bitmap Length | Bitmap ) +
704 * Blocks with no types present MUST NOT be included. Trailing zero
705 * octets in the bitmap MUST be omitted. The length of each block's
706 * bitmap is determined by the type code with the largest numerical
707 * value within that block, among the set of RR types present at the
708 * NSEC RR's owner name. Trailing zero octets not specified MUST be
709 * interpreted as zero octets.
712 ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[],
714 ldns_rr_type nsec_type)
716 uint8_t window; /* most significant octet of type */
717 uint8_t subtype; /* least significant octet of type */
718 int windows[256]; /* Max subtype per window */
719 uint8_t windowpresent[256]; /* bool if window appears in bitmap */
720 ldns_rr_type* d; /* used to traverse rr_type_list*/
721 size_t i; /* used to traverse windows array */
723 size_t sz; /* size needed for type bitmap rdf */
724 uint8_t* data = NULL; /* rdf data */
725 uint8_t* dptr; /* used to itraverse rdf data */
726 ldns_rdf* rdf; /* bitmap rdf to return */
728 if (nsec_type != LDNS_RR_TYPE_NSEC &&
729 nsec_type != LDNS_RR_TYPE_NSEC3) {
732 memset(windows, 0, sizeof(int)*256);
733 memset(windowpresent, 0, 256);
735 /* Which other windows need to be in the bitmap rdf?
737 for (d = rr_type_list; d < rr_type_list + size; d++) {
740 windowpresent[window] = 1;
741 if (windows[window] < (int)subtype) {
742 windows[window] = (int)subtype;
746 /* How much space do we need in the rdf for those windows?
749 for (i = 0; i < 256; i++) {
750 if (windowpresent[i]) {
751 sz += windows[i] / 8 + 3;
755 /* Format rdf data according RFC3845 Section 2.1.2 (see above)
757 dptr = data = LDNS_CALLOC(uint8_t, sz);
761 for (i = 0; i < 256; i++) {
762 if (windowpresent[i]) {
763 *dptr++ = (uint8_t)i;
764 *dptr++ = (uint8_t)(windows[i] / 8 + 1);
766 /* Now let windows[i] index the bitmap
769 windows[i] = (int)(dptr - data);
778 for (d = rr_type_list; d < rr_type_list + size; d++) {
780 data[windows[*d >> 8] + subtype/8] |= (0x80 >> (subtype % 8));
783 /* Allocate and return rdf structure for the data
785 rdf = ldns_rdf_new(LDNS_RDF_TYPE_BITMAP, sz, data);
794 ldns_dnssec_rrsets_contains_type(const ldns_dnssec_rrsets *rrsets,
797 const ldns_dnssec_rrsets *cur_rrset = rrsets;
799 if (cur_rrset->type == type) {
802 cur_rrset = cur_rrset->next;
808 ldns_dnssec_create_nsec(const ldns_dnssec_name *from,
809 const ldns_dnssec_name *to,
810 ldns_rr_type nsec_type)
813 ldns_rr_type types[65536];
814 size_t type_count = 0;
815 ldns_dnssec_rrsets *cur_rrsets;
816 int on_delegation_point;
818 if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC)) {
822 nsec_rr = ldns_rr_new();
823 ldns_rr_set_type(nsec_rr, nsec_type);
824 ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from)));
825 ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to)));
827 on_delegation_point = ldns_dnssec_rrsets_contains_type(
828 from->rrsets, LDNS_RR_TYPE_NS)
829 && !ldns_dnssec_rrsets_contains_type(
830 from->rrsets, LDNS_RR_TYPE_SOA);
832 cur_rrsets = from->rrsets;
834 /* Do not include non-authoritative rrsets on the delegation point
835 * in the type bitmap */
836 if ((on_delegation_point && (
837 cur_rrsets->type == LDNS_RR_TYPE_NS
838 || cur_rrsets->type == LDNS_RR_TYPE_DS))
839 || (!on_delegation_point &&
840 cur_rrsets->type != LDNS_RR_TYPE_RRSIG
841 && cur_rrsets->type != LDNS_RR_TYPE_NSEC)) {
843 types[type_count] = cur_rrsets->type;
846 cur_rrsets = cur_rrsets->next;
849 types[type_count] = LDNS_RR_TYPE_RRSIG;
851 types[type_count] = LDNS_RR_TYPE_NSEC;
854 ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types,
862 ldns_dnssec_create_nsec3(const ldns_dnssec_name *from,
863 const ldns_dnssec_name *to,
864 const ldns_rdf *zone_name,
872 ldns_rr_type types[65536];
873 size_t type_count = 0;
874 ldns_dnssec_rrsets *cur_rrsets;
876 int on_delegation_point;
882 nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
883 ldns_rr_set_owner(nsec_rr,
884 ldns_nsec3_hash_name(ldns_dnssec_name_name(from),
889 status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name);
890 if(status != LDNS_STATUS_OK) {
891 ldns_rr_free(nsec_rr);
894 ldns_nsec3_add_param_rdfs(nsec_rr,
901 on_delegation_point = ldns_dnssec_rrsets_contains_type(
902 from->rrsets, LDNS_RR_TYPE_NS)
903 && !ldns_dnssec_rrsets_contains_type(
904 from->rrsets, LDNS_RR_TYPE_SOA);
905 cur_rrsets = from->rrsets;
907 /* Do not include non-authoritative rrsets on the delegation point
908 * in the type bitmap. Potentionally not skipping insecure
909 * delegation should have been done earlier, in function
910 * ldns_dnssec_zone_create_nsec3s, or even earlier in:
911 * ldns_dnssec_zone_sign_nsec3_flg .
913 if ((on_delegation_point && (
914 cur_rrsets->type == LDNS_RR_TYPE_NS
915 || cur_rrsets->type == LDNS_RR_TYPE_DS))
916 || (!on_delegation_point &&
917 cur_rrsets->type != LDNS_RR_TYPE_RRSIG)) {
919 types[type_count] = cur_rrsets->type;
922 cur_rrsets = cur_rrsets->next;
924 /* always add rrsig type if this is not an unsigned
927 if (type_count > 0 &&
928 !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) {
929 types[type_count] = LDNS_RR_TYPE_RRSIG;
933 /* leave next rdata empty if they weren't precomputed yet */
934 if (to && to->hashed_name) {
935 (void) ldns_rr_set_rdf(nsec_rr,
936 ldns_rdf_clone(to->hashed_name),
939 (void) ldns_rr_set_rdf(nsec_rr, NULL, 4);
942 ldns_rr_push_rdf(nsec_rr,
943 ldns_dnssec_create_nsec_bitmap(types,
945 LDNS_RR_TYPE_NSEC3));
951 ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs)
953 /* we do not do any check here - garbage in, garbage out */
955 /* the the start and end names - get the type from the
958 /* inefficient, just give it a name, a next name, and a list of rrs */
959 /* we make 1 big uberbitmap first, then windows */
960 /* todo: make something more efficient :) */
965 ldns_rr *nsec = NULL;
966 ldns_rr_type i_type_list[65536];
967 size_t type_count = 0;
969 nsec = ldns_rr_new();
970 ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC);
971 ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner));
972 ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner));
974 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
975 i_rr = ldns_rr_list_rr(rrs, i);
976 if (ldns_rdf_compare(cur_owner,
977 ldns_rr_owner(i_rr)) == 0) {
978 i_type = ldns_rr_get_type(i_rr);
979 if (i_type != LDNS_RR_TYPE_RRSIG && i_type != LDNS_RR_TYPE_NSEC) {
980 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
981 i_type_list[type_count] = i_type;
988 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
990 i_type_list[type_count] = LDNS_RR_TYPE_NSEC;
993 ldns_rr_push_rdf(nsec,
994 ldns_dnssec_create_nsec_bitmap(i_type_list,
995 type_count, LDNS_RR_TYPE_NSEC));
1001 ldns_nsec3_hash_name(const ldns_rdf *name,
1003 uint16_t iterations,
1004 uint8_t salt_length,
1005 const uint8_t *salt)
1007 size_t hashed_owner_str_len;
1009 ldns_rdf *hashed_owner;
1010 unsigned char *hashed_owner_str;
1011 char *hashed_owner_b32;
1012 size_t hashed_owner_b32_len;
1014 /* define to contain the largest possible hash, which is
1015 * sha1 at the moment */
1016 unsigned char hash[LDNS_SHA1_DIGEST_LENGTH];
1019 /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */
1020 if (algorithm != LDNS_SHA1) {
1024 /* prepare the owner name according to the draft section bla */
1025 cann = ldns_rdf_clone(name);
1028 fprintf(stderr, "Memory error\n");
1032 ldns_dname2canonical(cann);
1034 hashed_owner_str_len = salt_length + ldns_rdf_size(cann);
1035 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
1036 if(!hashed_owner_str) {
1037 ldns_rdf_deep_free(cann);
1040 memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann));
1041 memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length);
1042 ldns_rdf_deep_free(cann);
1044 for (cur_it = iterations + 1; cur_it > 0; cur_it--) {
1045 (void) ldns_sha1((unsigned char *) hashed_owner_str,
1046 (unsigned int) hashed_owner_str_len, hash);
1048 LDNS_FREE(hashed_owner_str);
1049 hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH;
1050 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
1051 if (!hashed_owner_str) {
1054 memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH);
1055 memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length);
1056 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length;
1059 LDNS_FREE(hashed_owner_str);
1060 hashed_owner_str = hash;
1061 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH;
1063 hashed_owner_b32 = LDNS_XMALLOC(char,
1064 ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1);
1065 if(!hashed_owner_b32) {
1068 hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex(
1069 (uint8_t *) hashed_owner_str,
1070 hashed_owner_str_len,
1072 ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1);
1073 if (hashed_owner_b32_len < 1) {
1075 fprintf(stderr, "Error in base32 extended hex encoding ");
1076 fprintf(stderr, "of hashed owner name (name: ");
1077 ldns_rdf_print(stderr, name);
1078 fprintf(stderr, ", return code: %u)\n",
1079 (unsigned int) hashed_owner_b32_len);
1081 LDNS_FREE(hashed_owner_b32);
1084 hashed_owner_b32[hashed_owner_b32_len] = '\0';
1086 status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32);
1087 if (status != LDNS_STATUS_OK) {
1089 fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32);
1091 LDNS_FREE(hashed_owner_b32);
1095 LDNS_FREE(hashed_owner_b32);
1096 return hashed_owner;
1100 ldns_nsec3_add_param_rdfs(ldns_rr *rr,
1103 uint16_t iterations,
1104 uint8_t salt_length,
1105 const uint8_t *salt)
1107 ldns_rdf *salt_rdf = NULL;
1108 uint8_t *salt_data = NULL;
1111 old = ldns_rr_set_rdf(rr,
1112 ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1113 1, (void*)&algorithm),
1115 if (old) ldns_rdf_deep_free(old);
1117 old = ldns_rr_set_rdf(rr,
1118 ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1121 if (old) ldns_rdf_deep_free(old);
1123 old = ldns_rr_set_rdf(rr,
1124 ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
1127 if (old) ldns_rdf_deep_free(old);
1129 salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1);
1131 /* no way to return error */
1134 salt_data[0] = salt_length;
1135 memcpy(salt_data + 1, salt, salt_length);
1136 salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT,
1140 LDNS_FREE(salt_data);
1141 /* no way to return error */
1145 old = ldns_rr_set_rdf(rr, salt_rdf, 3);
1146 if (old) ldns_rdf_deep_free(old);
1147 LDNS_FREE(salt_data);
1151 rr_list_delegation_only(const ldns_rdf *origin, const ldns_rr_list *rr_list)
1155 if (!origin || !rr_list) return 0;
1156 for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
1157 cur_rr = ldns_rr_list_rr(rr_list, i);
1158 if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) {
1161 if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) {
1168 /* this will NOT return the NSEC3 completed, you will have to run the
1169 finalize function on the rrlist later! */
1171 ldns_create_nsec3(const ldns_rdf *cur_owner,
1172 const ldns_rdf *cur_zone,
1173 const ldns_rr_list *rrs,
1176 uint16_t iterations,
1177 uint8_t salt_length,
1178 const uint8_t *salt,
1179 bool emptynonterminal)
1185 ldns_rr *nsec = NULL;
1186 ldns_rdf *hashed_owner = NULL;
1190 ldns_rr_type i_type_list[1024];
1191 size_t type_count = 0;
1193 hashed_owner = ldns_nsec3_hash_name(cur_owner,
1198 status = ldns_dname_cat(hashed_owner, cur_zone);
1199 if(status != LDNS_STATUS_OK) {
1200 ldns_rdf_deep_free(hashed_owner);
1203 nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
1205 ldns_rdf_deep_free(hashed_owner);
1208 ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3);
1209 ldns_rr_set_owner(nsec, hashed_owner);
1211 ldns_nsec3_add_param_rdfs(nsec,
1217 (void) ldns_rr_set_rdf(nsec, NULL, 4);
1220 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
1221 i_rr = ldns_rr_list_rr(rrs, i);
1222 if (ldns_rdf_compare(cur_owner,
1223 ldns_rr_owner(i_rr)) == 0) {
1224 i_type = ldns_rr_get_type(i_rr);
1225 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
1226 i_type_list[type_count] = i_type;
1232 /* add RRSIG anyway, but only if this is not an ENT or
1233 * an unsigned delegation */
1234 if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) {
1235 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
1239 /* and SOA if owner == zone */
1240 if (ldns_dname_compare(cur_zone, cur_owner) == 0) {
1241 i_type_list[type_count] = LDNS_RR_TYPE_SOA;
1245 ldns_rr_push_rdf(nsec,
1246 ldns_dnssec_create_nsec_bitmap(i_type_list,
1247 type_count, LDNS_RR_TYPE_NSEC3));
1253 ldns_nsec3_algorithm(const ldns_rr *nsec3_rr)
1256 (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1257 ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1258 && (ldns_rr_rdf(nsec3_rr, 0) != NULL)
1259 && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0) {
1260 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0));
1266 ldns_nsec3_flags(const ldns_rr *nsec3_rr)
1269 (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1270 ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1271 && (ldns_rr_rdf(nsec3_rr, 1) != NULL)
1272 && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0) {
1273 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1));
1279 ldns_nsec3_optout(const ldns_rr *nsec3_rr)
1281 return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK);
1285 ldns_nsec3_iterations(const ldns_rr *nsec3_rr)
1288 (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1289 ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1290 && (ldns_rr_rdf(nsec3_rr, 2) != NULL)
1291 && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0) {
1292 return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2));
1299 ldns_nsec3_salt(const ldns_rr *nsec3_rr)
1302 (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1303 ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1305 return ldns_rr_rdf(nsec3_rr, 3);
1311 ldns_nsec3_salt_length(const ldns_rr *nsec3_rr)
1313 ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1314 if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1315 return (uint8_t) ldns_rdf_data(salt_rdf)[0];
1320 /* allocs data, free with LDNS_FREE() */
1322 ldns_nsec3_salt_data(const ldns_rr *nsec3_rr)
1324 uint8_t salt_length;
1327 ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1328 if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1329 salt_length = ldns_rdf_data(salt_rdf)[0];
1330 salt = LDNS_XMALLOC(uint8_t, salt_length);
1331 if(!salt) return NULL;
1332 memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length);
1339 ldns_nsec3_next_owner(const ldns_rr *nsec3_rr)
1341 if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1344 return ldns_rr_rdf(nsec3_rr, 4);
1349 ldns_nsec3_bitmap(const ldns_rr *nsec3_rr)
1351 if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1354 return ldns_rr_rdf(nsec3_rr, 5);
1359 ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, const ldns_rdf *name)
1362 uint16_t iterations;
1363 uint8_t salt_length;
1366 ldns_rdf *hashed_owner;
1368 algorithm = ldns_nsec3_algorithm(nsec);
1369 salt_length = ldns_nsec3_salt_length(nsec);
1370 salt = ldns_nsec3_salt_data(nsec);
1371 iterations = ldns_nsec3_iterations(nsec);
1373 hashed_owner = ldns_nsec3_hash_name(name,
1380 return hashed_owner;
1384 ldns_nsec_bitmap_covers_type(const ldns_rdf* bitmap, ldns_rr_type type)
1389 /* From RFC3845 Section 2.1.2:
1391 * "The RR type space is split into 256 window blocks, each re-
1392 * presenting the low-order 8 bits of the 16-bit RR type space."
1394 uint8_t window = type >> 8;
1395 uint8_t subtype = type & 0xff;
1400 assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1402 dptr = ldns_rdf_data(bitmap);
1403 dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1405 /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1406 * dptr[0] dptr[1] dptr[2:]
1408 while (dptr < dend && dptr[0] <= window) {
1410 if (dptr[0] == window && subtype / 8 < dptr[1] &&
1411 dptr + dptr[1] + 2 <= dend) {
1413 return dptr[2 + subtype / 8] & (0x80 >> (subtype % 8));
1415 dptr += dptr[1] + 2; /* next window */
1421 ldns_nsec_bitmap_set_type(ldns_rdf* bitmap, ldns_rr_type type)
1426 /* From RFC3845 Section 2.1.2:
1428 * "The RR type space is split into 256 window blocks, each re-
1429 * presenting the low-order 8 bits of the 16-bit RR type space."
1431 uint8_t window = type >> 8;
1432 uint8_t subtype = type & 0xff;
1437 assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1439 dptr = ldns_rdf_data(bitmap);
1440 dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1442 /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1443 * dptr[0] dptr[1] dptr[2:]
1445 while (dptr < dend && dptr[0] <= window) {
1447 if (dptr[0] == window && subtype / 8 < dptr[1] &&
1448 dptr + dptr[1] + 2 <= dend) {
1450 dptr[2 + subtype / 8] |= (0x80 >> (subtype % 8));
1451 return LDNS_STATUS_OK;
1453 dptr += dptr[1] + 2; /* next window */
1455 return LDNS_STATUS_TYPE_NOT_IN_BITMAP;
1459 ldns_nsec_bitmap_clear_type(ldns_rdf* bitmap, ldns_rr_type type)
1464 /* From RFC3845 Section 2.1.2:
1466 * "The RR type space is split into 256 window blocks, each re-
1467 * presenting the low-order 8 bits of the 16-bit RR type space."
1469 uint8_t window = type >> 8;
1470 uint8_t subtype = type & 0xff;
1476 assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1478 dptr = ldns_rdf_data(bitmap);
1479 dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1481 /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1482 * dptr[0] dptr[1] dptr[2:]
1484 while (dptr < dend && dptr[0] <= window) {
1486 if (dptr[0] == window && subtype / 8 < dptr[1] &&
1487 dptr + dptr[1] + 2 <= dend) {
1489 dptr[2 + subtype / 8] &= ~(0x80 >> (subtype % 8));
1490 return LDNS_STATUS_OK;
1492 dptr += dptr[1] + 2; /* next window */
1494 return LDNS_STATUS_TYPE_NOT_IN_BITMAP;
1499 ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name)
1501 ldns_rdf *nsec_owner = ldns_rr_owner(nsec);
1502 ldns_rdf *hash_next;
1503 char *next_hash_str;
1504 ldns_rdf *nsec_next = NULL;
1506 ldns_rdf *chopped_dname;
1509 if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
1510 if (ldns_rr_rdf(nsec, 0) != NULL) {
1511 nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0));
1515 } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
1516 hash_next = ldns_nsec3_next_owner(nsec);
1517 next_hash_str = ldns_rdf2str(hash_next);
1518 nsec_next = ldns_dname_new_frm_str(next_hash_str);
1519 LDNS_FREE(next_hash_str);
1520 chopped_dname = ldns_dname_left_chop(nsec_owner);
1521 status = ldns_dname_cat(nsec_next, chopped_dname);
1522 ldns_rdf_deep_free(chopped_dname);
1523 if (status != LDNS_STATUS_OK) {
1524 printf("error catting: %s\n", ldns_get_errorstr_by_id(status));
1527 ldns_rdf_deep_free(nsec_next);
1531 /* in the case of the last nsec */
1532 if(ldns_dname_compare(nsec_owner, nsec_next) > 0) {
1533 result = (ldns_dname_compare(nsec_owner, name) <= 0 ||
1534 ldns_dname_compare(name, nsec_next) < 0);
1535 } else if(ldns_dname_compare(nsec_owner, nsec_next) < 0) {
1536 result = (ldns_dname_compare(nsec_owner, name) <= 0 &&
1537 ldns_dname_compare(name, nsec_next) < 0);
1542 ldns_rdf_deep_free(nsec_next);
1547 /* sig may be null - if so look in the packet */
1550 ldns_pkt_verify_time(const ldns_pkt *p, ldns_rr_type t, const ldns_rdf *o,
1551 const ldns_rr_list *k, const ldns_rr_list *s,
1552 time_t check_time, ldns_rr_list *good_keys)
1554 ldns_rr_list *rrset;
1556 ldns_rr_list *sigs_covered;
1558 ldns_rr_type t_netorder;
1561 return LDNS_STATUS_ERR;
1562 /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */
1565 if (t == LDNS_RR_TYPE_RRSIG) {
1566 /* we don't have RRSIG(RRSIG) (yet? ;-) ) */
1567 return LDNS_STATUS_ERR;
1571 /* if s is not NULL, the sigs are given to use */
1572 sigs = (ldns_rr_list *)s;
1574 /* otherwise get them from the packet */
1575 sigs = ldns_pkt_rr_list_by_name_and_type(p, o,
1577 LDNS_SECTION_ANY_NOQUESTION);
1580 return LDNS_STATUS_ERR;
1581 /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */
1585 /* rrsig are subtyped, so now we need to find the correct
1586 * sigs for the type t
1588 t_netorder = htons(t); /* rdf are in network order! */
1589 /* a type identifier is a 16-bit number, so the size is 2 bytes */
1590 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 2, &t_netorder);
1592 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
1593 ldns_rdf_free(rdf_t);
1594 if (! sigs_covered) {
1596 ldns_rr_list_deep_free(sigs);
1598 return LDNS_STATUS_ERR;
1600 ldns_rr_list_deep_free(sigs_covered);
1602 rrset = ldns_pkt_rr_list_by_name_and_type(p, o, t,
1603 LDNS_SECTION_ANY_NOQUESTION);
1606 ldns_rr_list_deep_free(sigs);
1608 return LDNS_STATUS_ERR;
1610 return ldns_verify_time(rrset, sigs, k, check_time, good_keys);
1614 ldns_pkt_verify(const ldns_pkt *p, ldns_rr_type t, const ldns_rdf *o,
1615 const ldns_rr_list *k, const ldns_rr_list *s, ldns_rr_list *good_keys)
1617 return ldns_pkt_verify_time(p, t, o, k, s, ldns_time(NULL), good_keys);
1619 #endif /* HAVE_SSL */
1622 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs)
1625 char *next_nsec_owner_str;
1626 ldns_rdf *next_nsec_owner_label;
1627 ldns_rdf *next_nsec_rdf;
1628 ldns_status status = LDNS_STATUS_OK;
1630 for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) {
1631 if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) {
1632 next_nsec_owner_label =
1633 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1635 next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1636 if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1638 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1641 status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1642 next_nsec_owner_str);
1643 if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1644 next_nsec_rdf, 4)) {
1648 ldns_rdf_deep_free(next_nsec_owner_label);
1649 LDNS_FREE(next_nsec_owner_str);
1651 next_nsec_owner_label =
1652 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1655 next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1656 if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1658 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1661 status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1662 next_nsec_owner_str);
1663 ldns_rdf_deep_free(next_nsec_owner_label);
1664 LDNS_FREE(next_nsec_owner_str);
1665 if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1666 next_nsec_rdf, 4)) {
1675 qsort_rr_compare_nsec3(const void *a, const void *b)
1677 const ldns_rr *rr1 = * (const ldns_rr **) a;
1678 const ldns_rr *rr2 = * (const ldns_rr **) b;
1679 if (rr1 == NULL && rr2 == NULL) {
1688 return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2));
1692 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted)
1694 qsort(unsorted->_rrs,
1695 ldns_rr_list_rr_count(unsorted),
1697 qsort_rr_compare_nsec3);
1701 ldns_dnssec_default_add_to_signatures( ATTR_UNUSED(ldns_rr *sig)
1702 , ATTR_UNUSED(void *n)
1705 return LDNS_SIGNATURE_LEAVE_ADD_NEW;
1709 ldns_dnssec_default_leave_signatures( ATTR_UNUSED(ldns_rr *sig)
1710 , ATTR_UNUSED(void *n)
1713 return LDNS_SIGNATURE_LEAVE_NO_ADD;
1717 ldns_dnssec_default_delete_signatures( ATTR_UNUSED(ldns_rr *sig)
1718 , ATTR_UNUSED(void *n)
1721 return LDNS_SIGNATURE_REMOVE_NO_ADD;
1725 ldns_dnssec_default_replace_signatures( ATTR_UNUSED(ldns_rr *sig)
1726 , ATTR_UNUSED(void *n)
1729 return LDNS_SIGNATURE_REMOVE_ADD_NEW;
1734 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig,
1738 ldns_rdf *sigdata_rdf;
1740 const BIGNUM *R, *S;
1741 unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig);
1744 dsasig = d2i_DSA_SIG(NULL,
1745 (const unsigned char **)&dsasig_data,
1748 DSA_SIG_free(dsasig);
1752 dsasig_data = LDNS_XMALLOC(unsigned char, 41);
1754 DSA_SIG_free(dsasig);
1758 # ifdef HAVE_DSA_SIG_GET0
1759 DSA_SIG_get0(dsasig, &R, &S);
1764 byte_offset = (size_t) (20 - BN_num_bytes(R));
1765 if (byte_offset > 20) {
1766 DSA_SIG_free(dsasig);
1767 LDNS_FREE(dsasig_data);
1770 memset(&dsasig_data[1], 0, byte_offset);
1771 BN_bn2bin(R, &dsasig_data[1 + byte_offset]);
1772 byte_offset = (size_t) (20 - BN_num_bytes(S));
1773 if (byte_offset > 20) {
1774 DSA_SIG_free(dsasig);
1775 LDNS_FREE(dsasig_data);
1778 memset(&dsasig_data[21], 0, byte_offset);
1779 BN_bn2bin(S, &dsasig_data[21 + byte_offset]);
1781 sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data);
1783 LDNS_FREE(dsasig_data);
1785 DSA_SIG_free(dsasig);
1789 (void)sig; (void)sig_len;
1795 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1796 const ldns_rdf *sig_rdf)
1799 /* the EVP api wants the DER encoding of the signature... */
1802 unsigned char *raw_sig = NULL;
1805 if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH)
1806 return LDNS_STATUS_SYNTAX_RDATA_ERR;
1807 /* extract the R and S field from the sig buffer */
1809 if(!R) return LDNS_STATUS_MEM_ERR;
1810 (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1,
1811 SHA_DIGEST_LENGTH, R);
1815 return LDNS_STATUS_MEM_ERR;
1817 (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21,
1818 SHA_DIGEST_LENGTH, S);
1820 dsasig = DSA_SIG_new();
1824 return LDNS_STATUS_MEM_ERR;
1826 # ifdef HAVE_DSA_SIG_SET0
1827 if (! DSA_SIG_set0(dsasig, R, S))
1828 return LDNS_STATUS_SSL_ERR;
1834 raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig);
1835 if (raw_sig_len < 0) {
1836 DSA_SIG_free(dsasig);
1838 return LDNS_STATUS_SSL_ERR;
1840 if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1841 ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len);
1844 DSA_SIG_free(dsasig);
1847 return ldns_buffer_status(target_buffer);
1849 (void)target_buffer; (void)sig_rdf;
1850 return LDNS_STATUS_CRYPTO_ALGO_NOT_IMPL;
1857 ldns_convert_ecdsa_rrsig_asn1len2rdf(const ldns_buffer *sig,
1858 const long sig_len, int num_bytes)
1860 ECDSA_SIG* ecdsa_sig;
1861 const BIGNUM *r, *s;
1862 unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1864 ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len);
1865 if(!ecdsa_sig) return NULL;
1867 #ifdef HAVE_ECDSA_SIG_GET0
1868 ECDSA_SIG_get0(ecdsa_sig, &r, &s);
1874 if(BN_num_bytes(r) > num_bytes ||
1875 BN_num_bytes(s) > num_bytes) {
1876 ECDSA_SIG_free(ecdsa_sig);
1877 return NULL; /* numbers too big for passed curve size */
1879 data = LDNS_XMALLOC(unsigned char, num_bytes*2);
1881 ECDSA_SIG_free(ecdsa_sig);
1884 /* write the bignums (in big-endian) a little offset if the BN code
1885 * wants to write a shorter number of bytes, with zeroes prefixed */
1886 memset(data, 0, num_bytes*2);
1887 BN_bn2bin(r, data+num_bytes-BN_num_bytes(r));
1888 BN_bn2bin(s, data+num_bytes*2-BN_num_bytes(s));
1889 rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, (size_t)(num_bytes*2), data);
1890 ECDSA_SIG_free(ecdsa_sig);
1895 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1896 const ldns_rdf *sig_rdf)
1898 /* convert from two BIGNUMs in the rdata buffer, to ASN notation.
1899 * ASN preable: 30440220 <R 32bytefor256> 0220 <S 32bytefor256>
1900 * the '20' is the length of that field (=bnsize).
1901 * the '44' is the total remaining length.
1902 * if negative, start with leading zero.
1903 * if starts with 00s, remove them from the number.
1905 uint8_t pre[] = {0x30, 0x44, 0x02, 0x20};
1907 uint8_t mid[] = {0x02, 0x20};
1909 int raw_sig_len, r_high, s_high, r_rem=0, s_rem=0;
1910 long bnsize = (long)ldns_rdf_size(sig_rdf) / 2;
1911 uint8_t* d = ldns_rdf_data(sig_rdf);
1912 /* if too short, or not even length, do not bother */
1913 if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf))
1914 return LDNS_STATUS_ERR;
1915 /* strip leading zeroes from r (but not last one) */
1916 while(r_rem < bnsize-1 && d[r_rem] == 0)
1918 /* strip leading zeroes from s (but not last one) */
1919 while(s_rem < bnsize-1 && d[bnsize+s_rem] == 0)
1922 r_high = ((d[0+r_rem]&0x80)?1:0);
1923 s_high = ((d[bnsize+s_rem]&0x80)?1:0);
1924 raw_sig_len = pre_len + r_high + bnsize - r_rem + mid_len +
1925 s_high + bnsize - s_rem;
1926 if(ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1927 ldns_buffer_write_u8(target_buffer, pre[0]);
1928 ldns_buffer_write_u8(target_buffer, raw_sig_len-2);
1929 ldns_buffer_write_u8(target_buffer, pre[2]);
1930 ldns_buffer_write_u8(target_buffer, bnsize + r_high - r_rem);
1932 ldns_buffer_write_u8(target_buffer, 0);
1933 ldns_buffer_write(target_buffer, d+r_rem, bnsize-r_rem);
1934 ldns_buffer_write(target_buffer, mid, mid_len-1);
1935 ldns_buffer_write_u8(target_buffer, bnsize + s_high - s_rem);
1937 ldns_buffer_write_u8(target_buffer, 0);
1938 ldns_buffer_write(target_buffer, d+bnsize+s_rem, bnsize-s_rem);
1940 return ldns_buffer_status(target_buffer);
1943 #endif /* S_SPLINT_S */
1944 #endif /* USE_ECDSA */
1946 #if defined(USE_ED25519) || defined(USE_ED448)
1947 /* debug printout routine */
1948 static void print_hex(const char* str, uint8_t* d, int len)
1950 const char hex[] = "0123456789abcdef";
1952 printf("%s [len=%d]: ", str, len);
1953 for(i=0; i<len; i++) {
1954 int x = (d[i]&0xf0)>>4;
1955 int y = (d[i]&0x0f);
1956 printf("%c%c", hex[x], hex[y]);
1964 ldns_convert_ed25519_rrsig_asn12rdf(const ldns_buffer *sig, long sig_len)
1966 unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1967 ldns_rdf* rdf = NULL;
1969 /* TODO when Openssl supports signing and you can test this */
1970 print_hex("sig in ASN", data, sig_len);
1976 ldns_convert_ed25519_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1977 const ldns_rdf *sig_rdf)
1979 /* TODO when Openssl supports signing and you can test this. */
1980 /* convert sig_buf into ASN1 into the target_buffer */
1981 print_hex("sig raw", ldns_rdf_data(sig_rdf), ldns_rdf_size(sig_rdf));
1982 return ldns_buffer_status(target_buffer);
1984 #endif /* USE_ED25519 */
1988 ldns_convert_ed448_rrsig_asn12rdf(const ldns_buffer *sig, long sig_len)
1990 unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1991 ldns_rdf* rdf = NULL;
1993 /* TODO when Openssl supports signing and you can test this */
1994 print_hex("sig in ASN", data, sig_len);
2000 ldns_convert_ed448_rrsig_rdf2asn1(ldns_buffer *target_buffer,
2001 const ldns_rdf *sig_rdf)
2003 /* TODO when Openssl supports signing and you can test this. */
2004 /* convert sig_buf into ASN1 into the target_buffer */
2005 print_hex("sig raw", ldns_rdf_data(sig_rdf), ldns_rdf_size(sig_rdf));
2006 return ldns_buffer_status(target_buffer);
2008 #endif /* USE_ED448 */
2010 #endif /* HAVE_SSL */