/* * dnssec.c * * contains the cryptographic function needed for DNSSEC in ldns * The crypto library used is openssl * * (c) NLnet Labs, 2004-2008 * * See the file LICENSE for the license */ #include #include #include #include #include #ifdef HAVE_SSL #include #include #include #include #include #endif ldns_rr * ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name, const ldns_rr_type type, const ldns_rr_list *rrs) { size_t i; ldns_rr *candidate; if (!name || !rrs) { return NULL; } for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) { candidate = ldns_rr_list_rr(rrs, i); if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_RRSIG) { if (ldns_dname_compare(ldns_rr_owner(candidate), name) == 0 && ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(candidate)) == type ) { return candidate; } } } return NULL; } ldns_rr * ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig, const ldns_rr_list *rrs) { size_t i; ldns_rr *candidate; if (!rrsig || !rrs) { return NULL; } for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) { candidate = ldns_rr_list_rr(rrs, i); if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_DNSKEY) { if (ldns_dname_compare(ldns_rr_owner(candidate), ldns_rr_rrsig_signame(rrsig)) == 0 && ldns_rdf2native_int16(ldns_rr_rrsig_keytag(rrsig)) == ldns_calc_keytag(candidate) ) { return candidate; } } } return NULL; } ldns_rdf * ldns_nsec_get_bitmap(ldns_rr *nsec) { if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) { return ldns_rr_rdf(nsec, 1); } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) { return ldns_rr_rdf(nsec, 5); } else { return NULL; } } /*return the owner name of the closest encloser for name from the list of rrs */ /* this is NOT the hash, but the original name! */ ldns_rdf * ldns_dnssec_nsec3_closest_encloser(ldns_rdf *qname, ATTR_UNUSED(ldns_rr_type qtype), ldns_rr_list *nsec3s) { /* remember parameters, they must match */ uint8_t algorithm; uint32_t iterations; uint8_t salt_length; uint8_t *salt; ldns_rdf *sname, *hashed_sname, *tmp; bool flag; bool exact_match_found; bool in_range_found; ldns_status status; ldns_rdf *zone_name; size_t nsec_i; ldns_rr *nsec; ldns_rdf *result = NULL; if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) { return NULL; } nsec = ldns_rr_list_rr(nsec3s, 0); algorithm = ldns_nsec3_algorithm(nsec); salt_length = ldns_nsec3_salt_length(nsec); salt = ldns_nsec3_salt_data(nsec); iterations = ldns_nsec3_iterations(nsec); sname = ldns_rdf_clone(qname); flag = false; zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec)); /* algorithm from nsec3-07 8.3 */ while (ldns_dname_label_count(sname) > 0) { exact_match_found = false; in_range_found = false; hashed_sname = ldns_nsec3_hash_name(sname, algorithm, iterations, salt_length, salt); status = ldns_dname_cat(hashed_sname, zone_name); if(status != LDNS_STATUS_OK) { LDNS_FREE(salt); ldns_rdf_deep_free(zone_name); ldns_rdf_deep_free(sname); return NULL; } for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) { nsec = ldns_rr_list_rr(nsec3s, nsec_i); /* check values of iterations etc! */ /* exact match? */ if (ldns_dname_compare(ldns_rr_owner(nsec), hashed_sname) == 0) { exact_match_found = true; } else if (ldns_nsec_covers_name(nsec, hashed_sname)) { in_range_found = true; } } if (!exact_match_found && in_range_found) { flag = true; } else if (exact_match_found && flag) { result = ldns_rdf_clone(sname); /* RFC 5155: 8.3. 2.** "The proof is complete" */ ldns_rdf_deep_free(hashed_sname); goto done; } else if (exact_match_found && !flag) { /* error! */ ldns_rdf_deep_free(hashed_sname); goto done; } else { flag = false; } ldns_rdf_deep_free(hashed_sname); tmp = sname; sname = ldns_dname_left_chop(sname); ldns_rdf_deep_free(tmp); } done: LDNS_FREE(salt); ldns_rdf_deep_free(zone_name); ldns_rdf_deep_free(sname); return result; } bool ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt) { size_t i; for (i = 0; i < ldns_pkt_ancount(pkt); i++) { if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_answer(pkt), i)) == LDNS_RR_TYPE_RRSIG) { return true; } } for (i = 0; i < ldns_pkt_nscount(pkt); i++) { if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_authority(pkt), i)) == LDNS_RR_TYPE_RRSIG) { return true; } } return false; } ldns_rr_list * ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt, ldns_rdf *name, ldns_rr_type type) { uint16_t t_netorder; ldns_rr_list *sigs; ldns_rr_list *sigs_covered; ldns_rdf *rdf_t; sigs = ldns_pkt_rr_list_by_name_and_type(pkt, name, LDNS_RR_TYPE_RRSIG, LDNS_SECTION_ANY_NOQUESTION ); t_netorder = htons(type); /* rdf are in network order! */ rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, LDNS_RDF_SIZE_WORD, &t_netorder); sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0); ldns_rdf_free(rdf_t); ldns_rr_list_deep_free(sigs); return sigs_covered; } ldns_rr_list * ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type) { uint16_t t_netorder; ldns_rr_list *sigs; ldns_rr_list *sigs_covered; ldns_rdf *rdf_t; sigs = ldns_pkt_rr_list_by_type(pkt, LDNS_RR_TYPE_RRSIG, LDNS_SECTION_ANY_NOQUESTION ); t_netorder = htons(type); /* rdf are in network order! */ rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 2, &t_netorder); sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0); ldns_rdf_free(rdf_t); ldns_rr_list_deep_free(sigs); return sigs_covered; } /* used only on the public key RR */ uint16_t ldns_calc_keytag(const ldns_rr *key) { uint16_t ac16; ldns_buffer *keybuf; size_t keysize; if (!key) { return 0; } if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY && ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY ) { return 0; } /* rdata to buf - only put the rdata in a buffer */ keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */ if (!keybuf) { return 0; } (void)ldns_rr_rdata2buffer_wire(keybuf, key); /* the current pos in the buffer is the keysize */ keysize= ldns_buffer_position(keybuf); ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize); ldns_buffer_free(keybuf); return ac16; } uint16_t ldns_calc_keytag_raw(uint8_t* key, size_t keysize) { unsigned int i; uint32_t ac32; uint16_t ac16; if(keysize < 4) { return 0; } /* look at the algorithm field, copied from 2535bis */ if (key[3] == LDNS_RSAMD5) { ac16 = 0; if (keysize > 4) { memmove(&ac16, key + keysize - 3, 2); } ac16 = ntohs(ac16); return (uint16_t) ac16; } else { ac32 = 0; for (i = 0; (size_t)i < keysize; ++i) { ac32 += (i & 1) ? key[i] : key[i] << 8; } ac32 += (ac32 >> 16) & 0xFFFF; return (uint16_t) (ac32 & 0xFFFF); } } #ifdef HAVE_SSL DSA * ldns_key_buf2dsa(ldns_buffer *key) { return ldns_key_buf2dsa_raw((unsigned char*)ldns_buffer_begin(key), ldns_buffer_position(key)); } DSA * ldns_key_buf2dsa_raw(unsigned char* key, size_t len) { uint8_t T; uint16_t length; uint16_t offset; DSA *dsa; BIGNUM *Q; BIGNUM *P; BIGNUM *G; BIGNUM *Y; if(len == 0) return NULL; T = (uint8_t)key[0]; length = (64 + T * 8); offset = 1; if (T > 8) { return NULL; } if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length) return NULL; Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL); offset += SHA_DIGEST_LENGTH; P = BN_bin2bn(key+offset, (int)length, NULL); offset += length; G = BN_bin2bn(key+offset, (int)length, NULL); offset += length; Y = BN_bin2bn(key+offset, (int)length, NULL); offset += length; /* create the key and set its properties */ if(!Q || !P || !G || !Y || !(dsa = DSA_new())) { BN_free(Q); BN_free(P); BN_free(G); BN_free(Y); return NULL; } #ifndef S_SPLINT_S dsa->p = P; dsa->q = Q; dsa->g = G; dsa->pub_key = Y; #endif /* splint */ return dsa; } RSA * ldns_key_buf2rsa(ldns_buffer *key) { return ldns_key_buf2rsa_raw((unsigned char*)ldns_buffer_begin(key), ldns_buffer_position(key)); } RSA * ldns_key_buf2rsa_raw(unsigned char* key, size_t len) { uint16_t offset; uint16_t exp; uint16_t int16; RSA *rsa; BIGNUM *modulus; BIGNUM *exponent; if (len == 0) return NULL; if (key[0] == 0) { if(len < 3) return NULL; /* need some smart comment here XXX*/ /* the exponent is too large so it's places * futher...???? */ memmove(&int16, key+1, 2); exp = ntohs(int16); offset = 3; } else { exp = key[0]; offset = 1; } /* key length at least one */ if(len < (size_t)offset + exp + 1) return NULL; /* Exponent */ exponent = BN_new(); if(!exponent) return NULL; (void) BN_bin2bn(key+offset, (int)exp, exponent); offset += exp; /* Modulus */ modulus = BN_new(); if(!modulus) { BN_free(exponent); return NULL; } /* length of the buffer must match the key length! */ (void) BN_bin2bn(key+offset, (int)(len - offset), modulus); rsa = RSA_new(); if(!rsa) { BN_free(exponent); BN_free(modulus); return NULL; } #ifndef S_SPLINT_S rsa->n = modulus; rsa->e = exponent; #endif /* splint */ return rsa; } int ldns_digest_evp(unsigned char* data, unsigned int len, unsigned char* dest, const EVP_MD* md) { EVP_MD_CTX* ctx; ctx = EVP_MD_CTX_create(); if(!ctx) return false; if(!EVP_DigestInit_ex(ctx, md, NULL) || !EVP_DigestUpdate(ctx, data, len) || !EVP_DigestFinal_ex(ctx, dest, NULL)) { EVP_MD_CTX_destroy(ctx); return false; } EVP_MD_CTX_destroy(ctx); return true; } #endif /* HAVE_SSL */ ldns_rr * ldns_key_rr2ds(const ldns_rr *key, ldns_hash h) { ldns_rdf *tmp; ldns_rr *ds; uint16_t keytag; uint8_t sha1hash; uint8_t *digest; ldns_buffer *data_buf; #ifdef USE_GOST const EVP_MD* md = NULL; #endif if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) { return NULL; } ds = ldns_rr_new(); if (!ds) { return NULL; } ldns_rr_set_type(ds, LDNS_RR_TYPE_DS); ldns_rr_set_owner(ds, ldns_rdf_clone( ldns_rr_owner(key))); ldns_rr_set_ttl(ds, ldns_rr_ttl(key)); ldns_rr_set_class(ds, ldns_rr_get_class(key)); switch(h) { default: case LDNS_SHA1: digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH); if (!digest) { ldns_rr_free(ds); return NULL; } break; case LDNS_SHA256: digest = LDNS_XMALLOC(uint8_t, LDNS_SHA256_DIGEST_LENGTH); if (!digest) { ldns_rr_free(ds); return NULL; } break; case LDNS_HASH_GOST: #ifdef USE_GOST (void)ldns_key_EVP_load_gost_id(); md = EVP_get_digestbyname("md_gost94"); if(!md) { ldns_rr_free(ds); return NULL; } digest = LDNS_XMALLOC(uint8_t, EVP_MD_size(md)); if (!digest) { ldns_rr_free(ds); return NULL; } break; #else /* not implemented */ ldns_rr_free(ds); return NULL; #endif case LDNS_SHA384: #ifdef USE_ECDSA digest = LDNS_XMALLOC(uint8_t, SHA384_DIGEST_LENGTH); if (!digest) { ldns_rr_free(ds); return NULL; } break; #else /* not implemented */ ldns_rr_free(ds); return NULL; #endif } data_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN); if (!data_buf) { LDNS_FREE(digest); ldns_rr_free(ds); return NULL; } /* keytag */ keytag = htons(ldns_calc_keytag((ldns_rr*)key)); tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16, sizeof(uint16_t), &keytag); ldns_rr_push_rdf(ds, tmp); /* copy the algorithm field */ if ((tmp = ldns_rr_rdf(key, 2)) == NULL) { LDNS_FREE(digest); ldns_buffer_free(data_buf); ldns_rr_free(ds); return NULL; } else { ldns_rr_push_rdf(ds, ldns_rdf_clone( tmp )); } /* digest hash type */ sha1hash = (uint8_t)h; tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8, sizeof(uint8_t), &sha1hash); ldns_rr_push_rdf(ds, tmp); /* digest */ /* owner name */ tmp = ldns_rdf_clone(ldns_rr_owner(key)); ldns_dname2canonical(tmp); if (ldns_rdf2buffer_wire(data_buf, tmp) != LDNS_STATUS_OK) { LDNS_FREE(digest); ldns_buffer_free(data_buf); ldns_rr_free(ds); ldns_rdf_deep_free(tmp); return NULL; } ldns_rdf_deep_free(tmp); /* all the rdata's */ if (ldns_rr_rdata2buffer_wire(data_buf, (ldns_rr*)key) != LDNS_STATUS_OK) { LDNS_FREE(digest); ldns_buffer_free(data_buf); ldns_rr_free(ds); return NULL; } switch(h) { case LDNS_SHA1: (void) ldns_sha1((unsigned char *) ldns_buffer_begin(data_buf), (unsigned int) ldns_buffer_position(data_buf), (unsigned char *) digest); tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX, LDNS_SHA1_DIGEST_LENGTH, digest); ldns_rr_push_rdf(ds, tmp); break; case LDNS_SHA256: (void) ldns_sha256((unsigned char *) ldns_buffer_begin(data_buf), (unsigned int) ldns_buffer_position(data_buf), (unsigned char *) digest); tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX, LDNS_SHA256_DIGEST_LENGTH, digest); ldns_rr_push_rdf(ds, tmp); break; case LDNS_HASH_GOST: #ifdef USE_GOST if(!ldns_digest_evp((unsigned char *) ldns_buffer_begin(data_buf), (unsigned int) ldns_buffer_position(data_buf), (unsigned char *) digest, md)) { LDNS_FREE(digest); ldns_buffer_free(data_buf); ldns_rr_free(ds); return NULL; } tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX, (size_t)EVP_MD_size(md), digest); ldns_rr_push_rdf(ds, tmp); #endif break; case LDNS_SHA384: #ifdef USE_ECDSA (void) SHA384((unsigned char *) ldns_buffer_begin(data_buf), (unsigned int) ldns_buffer_position(data_buf), (unsigned char *) digest); tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX, SHA384_DIGEST_LENGTH, digest); ldns_rr_push_rdf(ds, tmp); #endif break; } LDNS_FREE(digest); ldns_buffer_free(data_buf); return ds; } ldns_rdf * ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[], size_t size, ldns_rr_type nsec_type) { size_t i; uint8_t *bitmap; uint16_t bm_len = 0; uint16_t i_type; ldns_rdf *bitmap_rdf; uint8_t *data = NULL; uint8_t cur_data[32]; uint8_t cur_window = 0; uint8_t cur_window_max = 0; uint16_t cur_data_size = 0; if (nsec_type != LDNS_RR_TYPE_NSEC && nsec_type != LDNS_RR_TYPE_NSEC3) { return NULL; } i_type = 0; for (i = 0; i < size; i++) { if (i_type < rr_type_list[i]) i_type = rr_type_list[i]; } if (i_type < nsec_type) { i_type = nsec_type; } bm_len = i_type / 8 + 2; bitmap = LDNS_XMALLOC(uint8_t, bm_len); if(!bitmap) return NULL; for (i = 0; i < bm_len; i++) { bitmap[i] = 0; } for (i = 0; i < size; i++) { i_type = rr_type_list[i]; ldns_set_bit(bitmap + (int) i_type / 8, (int) (7 - (i_type % 8)), true); } /* fold it into windows TODO: can this be done directly? */ memset(cur_data, 0, 32); for (i = 0; i < bm_len; i++) { if (i / 32 > cur_window) { /* check, copy, new */ if (cur_window_max > 0) { /* this window has stuff, add it */ data = LDNS_XREALLOC(data, uint8_t, cur_data_size + cur_window_max + 3); if(!data) { LDNS_FREE(bitmap); return NULL; } data[cur_data_size] = cur_window; data[cur_data_size + 1] = cur_window_max + 1; memcpy(data + cur_data_size + 2, cur_data, cur_window_max+1); cur_data_size += cur_window_max + 3; } cur_window++; cur_window_max = 0; memset(cur_data, 0, 32); } cur_data[i%32] = bitmap[i]; if (bitmap[i] > 0) { cur_window_max = i%32; } } if (cur_window_max > 0 || cur_data[0] != 0) { /* this window has stuff, add it */ data = LDNS_XREALLOC(data, uint8_t, cur_data_size + cur_window_max + 3); if(!data) { LDNS_FREE(bitmap); return NULL; } data[cur_data_size] = cur_window; data[cur_data_size + 1] = cur_window_max + 1; memcpy(data + cur_data_size + 2, cur_data, cur_window_max+1); cur_data_size += cur_window_max + 3; } bitmap_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC, cur_data_size, data); LDNS_FREE(bitmap); LDNS_FREE(data); return bitmap_rdf; } int ldns_dnssec_rrsets_contains_type(ldns_dnssec_rrsets *rrsets, ldns_rr_type type) { ldns_dnssec_rrsets *cur_rrset = rrsets; while (cur_rrset) { if (cur_rrset->type == type) { return 1; } cur_rrset = cur_rrset->next; } return 0; } ldns_rr * ldns_dnssec_create_nsec(ldns_dnssec_name *from, ldns_dnssec_name *to, ldns_rr_type nsec_type) { ldns_rr *nsec_rr; ldns_rr_type types[65536]; size_t type_count = 0; ldns_dnssec_rrsets *cur_rrsets; int on_delegation_point; if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC)) { return NULL; } nsec_rr = ldns_rr_new(); ldns_rr_set_type(nsec_rr, nsec_type); ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from))); ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to))); on_delegation_point = ldns_dnssec_rrsets_contains_type( from->rrsets, LDNS_RR_TYPE_NS) && !ldns_dnssec_rrsets_contains_type( from->rrsets, LDNS_RR_TYPE_SOA); cur_rrsets = from->rrsets; while (cur_rrsets) { /* Do not include non-authoritative rrsets on the delegation point * in the type bitmap */ if ((on_delegation_point && ( cur_rrsets->type == LDNS_RR_TYPE_NS || cur_rrsets->type == LDNS_RR_TYPE_DS)) || (!on_delegation_point && cur_rrsets->type != LDNS_RR_TYPE_RRSIG && cur_rrsets->type != LDNS_RR_TYPE_NSEC)) { types[type_count] = cur_rrsets->type; type_count++; } cur_rrsets = cur_rrsets->next; } types[type_count] = LDNS_RR_TYPE_RRSIG; type_count++; types[type_count] = LDNS_RR_TYPE_NSEC; type_count++; ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types, type_count, nsec_type)); return nsec_rr; } ldns_rr * ldns_dnssec_create_nsec3(ldns_dnssec_name *from, ldns_dnssec_name *to, ldns_rdf *zone_name, uint8_t algorithm, uint8_t flags, uint16_t iterations, uint8_t salt_length, uint8_t *salt) { ldns_rr *nsec_rr; ldns_rr_type types[65536]; size_t type_count = 0; ldns_dnssec_rrsets *cur_rrsets; ldns_status status; int on_delegation_point; if (!from) { return NULL; } nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3); ldns_rr_set_owner(nsec_rr, ldns_nsec3_hash_name(ldns_dnssec_name_name(from), algorithm, iterations, salt_length, salt)); status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name); if(status != LDNS_STATUS_OK) { ldns_rr_free(nsec_rr); return NULL; } ldns_nsec3_add_param_rdfs(nsec_rr, algorithm, flags, iterations, salt_length, salt); on_delegation_point = ldns_dnssec_rrsets_contains_type( from->rrsets, LDNS_RR_TYPE_NS) && !ldns_dnssec_rrsets_contains_type( from->rrsets, LDNS_RR_TYPE_SOA); cur_rrsets = from->rrsets; while (cur_rrsets) { /* Do not include non-authoritative rrsets on the delegation point * in the type bitmap. Potentionally not skipping insecure * delegation should have been done earlier, in function * ldns_dnssec_zone_create_nsec3s, or even earlier in: * ldns_dnssec_zone_sign_nsec3_flg . */ if ((on_delegation_point && ( cur_rrsets->type == LDNS_RR_TYPE_NS || cur_rrsets->type == LDNS_RR_TYPE_DS)) || (!on_delegation_point && cur_rrsets->type != LDNS_RR_TYPE_RRSIG)) { types[type_count] = cur_rrsets->type; type_count++; } cur_rrsets = cur_rrsets->next; } /* always add rrsig type if this is not an unsigned * delegation */ if (type_count > 0 && !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) { types[type_count] = LDNS_RR_TYPE_RRSIG; type_count++; } /* leave next rdata empty if they weren't precomputed yet */ if (to && to->hashed_name) { (void) ldns_rr_set_rdf(nsec_rr, ldns_rdf_clone(to->hashed_name), 4); } else { (void) ldns_rr_set_rdf(nsec_rr, NULL, 4); } ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types, type_count, LDNS_RR_TYPE_NSEC3)); return nsec_rr; } ldns_rr * ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs) { /* we do not do any check here - garbage in, garbage out */ /* the the start and end names - get the type from the * before rrlist */ /* inefficient, just give it a name, a next name, and a list of rrs */ /* we make 1 big uberbitmap first, then windows */ /* todo: make something more efficient :) */ uint16_t i; ldns_rr *i_rr; uint16_t i_type; ldns_rr *nsec = NULL; ldns_rr_type i_type_list[65536]; size_t type_count = 0; nsec = ldns_rr_new(); ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC); ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner)); ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner)); for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) { i_rr = ldns_rr_list_rr(rrs, i); if (ldns_rdf_compare(cur_owner, ldns_rr_owner(i_rr)) == 0) { i_type = ldns_rr_get_type(i_rr); if (i_type != LDNS_RR_TYPE_RRSIG && i_type != LDNS_RR_TYPE_NSEC) { if (type_count == 0 || i_type_list[type_count-1] != i_type) { i_type_list[type_count] = i_type; type_count++; } } } } i_type_list[type_count] = LDNS_RR_TYPE_RRSIG; type_count++; i_type_list[type_count] = LDNS_RR_TYPE_NSEC; type_count++; ldns_rr_push_rdf(nsec, ldns_dnssec_create_nsec_bitmap(i_type_list, type_count, LDNS_RR_TYPE_NSEC)); return nsec; } ldns_rdf * ldns_nsec3_hash_name(ldns_rdf *name, uint8_t algorithm, uint16_t iterations, uint8_t salt_length, uint8_t *salt) { size_t hashed_owner_str_len; ldns_rdf *cann; ldns_rdf *hashed_owner; unsigned char *hashed_owner_str; char *hashed_owner_b32; size_t hashed_owner_b32_len; uint32_t cur_it; /* define to contain the largest possible hash, which is * sha1 at the moment */ unsigned char hash[LDNS_SHA1_DIGEST_LENGTH]; ldns_status status; /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */ if (algorithm != LDNS_SHA1) { return NULL; } /* prepare the owner name according to the draft section bla */ cann = ldns_rdf_clone(name); if(!cann) { fprintf(stderr, "Memory error\n"); return NULL; } ldns_dname2canonical(cann); hashed_owner_str_len = salt_length + ldns_rdf_size(cann); hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len); if(!hashed_owner_str) { ldns_rdf_deep_free(cann); return NULL; } memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann)); memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length); ldns_rdf_deep_free(cann); for (cur_it = iterations + 1; cur_it > 0; cur_it--) { (void) ldns_sha1((unsigned char *) hashed_owner_str, (unsigned int) hashed_owner_str_len, hash); LDNS_FREE(hashed_owner_str); hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH; hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len); if (!hashed_owner_str) { return NULL; } memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH); memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length); hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length; } LDNS_FREE(hashed_owner_str); hashed_owner_str = hash; hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH; hashed_owner_b32 = LDNS_XMALLOC(char, ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1); if(!hashed_owner_b32) { return NULL; } hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex( (uint8_t *) hashed_owner_str, hashed_owner_str_len, hashed_owner_b32, ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1); if (hashed_owner_b32_len < 1) { fprintf(stderr, "Error in base32 extended hex encoding "); fprintf(stderr, "of hashed owner name (name: "); ldns_rdf_print(stderr, name); fprintf(stderr, ", return code: %u)\n", (unsigned int) hashed_owner_b32_len); LDNS_FREE(hashed_owner_b32); return NULL; } hashed_owner_b32[hashed_owner_b32_len] = '\0'; status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32); if (status != LDNS_STATUS_OK) { fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32); LDNS_FREE(hashed_owner_b32); return NULL; } LDNS_FREE(hashed_owner_b32); return hashed_owner; } void ldns_nsec3_add_param_rdfs(ldns_rr *rr, uint8_t algorithm, uint8_t flags, uint16_t iterations, uint8_t salt_length, uint8_t *salt) { ldns_rdf *salt_rdf = NULL; uint8_t *salt_data = NULL; ldns_rdf *old; old = ldns_rr_set_rdf(rr, ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8, 1, (void*)&algorithm), 0); if (old) ldns_rdf_deep_free(old); old = ldns_rr_set_rdf(rr, ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8, 1, (void*)&flags), 1); if (old) ldns_rdf_deep_free(old); old = ldns_rr_set_rdf(rr, ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16, iterations), 2); if (old) ldns_rdf_deep_free(old); salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1); if(!salt_data) { /* no way to return error */ return; } salt_data[0] = salt_length; memcpy(salt_data + 1, salt, salt_length); salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT, salt_length + 1, salt_data); if(!salt_rdf) { LDNS_FREE(salt_data); /* no way to return error */ return; } old = ldns_rr_set_rdf(rr, salt_rdf, 3); if (old) ldns_rdf_deep_free(old); LDNS_FREE(salt_data); } static int rr_list_delegation_only(ldns_rdf *origin, ldns_rr_list *rr_list) { size_t i; ldns_rr *cur_rr; if (!origin || !rr_list) return 0; for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) { cur_rr = ldns_rr_list_rr(rr_list, i); if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) { return 0; } if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) { return 0; } } return 1; } /* this will NOT return the NSEC3 completed, you will have to run the finalize function on the rrlist later! */ ldns_rr * ldns_create_nsec3(ldns_rdf *cur_owner, ldns_rdf *cur_zone, ldns_rr_list *rrs, uint8_t algorithm, uint8_t flags, uint16_t iterations, uint8_t salt_length, uint8_t *salt, bool emptynonterminal) { size_t i; ldns_rr *i_rr; uint16_t i_type; ldns_rr *nsec = NULL; ldns_rdf *hashed_owner = NULL; ldns_status status; ldns_rr_type i_type_list[1024]; size_t type_count = 0; hashed_owner = ldns_nsec3_hash_name(cur_owner, algorithm, iterations, salt_length, salt); status = ldns_dname_cat(hashed_owner, cur_zone); if(status != LDNS_STATUS_OK) return NULL; nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3); if(!nsec) return NULL; ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3); ldns_rr_set_owner(nsec, hashed_owner); ldns_nsec3_add_param_rdfs(nsec, algorithm, flags, iterations, salt_length, salt); (void) ldns_rr_set_rdf(nsec, NULL, 4); for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) { i_rr = ldns_rr_list_rr(rrs, i); if (ldns_rdf_compare(cur_owner, ldns_rr_owner(i_rr)) == 0) { i_type = ldns_rr_get_type(i_rr); if (type_count == 0 || i_type_list[type_count-1] != i_type) { i_type_list[type_count] = i_type; type_count++; } } } /* add RRSIG anyway, but only if this is not an ENT or * an unsigned delegation */ if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) { i_type_list[type_count] = LDNS_RR_TYPE_RRSIG; type_count++; } /* and SOA if owner == zone */ if (ldns_dname_compare(cur_zone, cur_owner) == 0) { i_type_list[type_count] = LDNS_RR_TYPE_SOA; type_count++; } ldns_rr_push_rdf(nsec, ldns_dnssec_create_nsec_bitmap(i_type_list, type_count, LDNS_RR_TYPE_NSEC3)); return nsec; } uint8_t ldns_nsec3_algorithm(const ldns_rr *nsec3_rr) { if (nsec3_rr && (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 || ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM) && (ldns_rr_rdf(nsec3_rr, 0) != NULL) && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0) { return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0)); } return 0; } uint8_t ldns_nsec3_flags(const ldns_rr *nsec3_rr) { if (nsec3_rr && (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 || ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM) && (ldns_rr_rdf(nsec3_rr, 1) != NULL) && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0) { return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1)); } return 0; } bool ldns_nsec3_optout(const ldns_rr *nsec3_rr) { return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK); } uint16_t ldns_nsec3_iterations(const ldns_rr *nsec3_rr) { if (nsec3_rr && (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 || ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM) && (ldns_rr_rdf(nsec3_rr, 2) != NULL) && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0) { return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2)); } return 0; } ldns_rdf * ldns_nsec3_salt(const ldns_rr *nsec3_rr) { if (nsec3_rr && (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 || ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM) ) { return ldns_rr_rdf(nsec3_rr, 3); } return NULL; } uint8_t ldns_nsec3_salt_length(const ldns_rr *nsec3_rr) { ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr); if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) { return (uint8_t) ldns_rdf_data(salt_rdf)[0]; } return 0; } /* allocs data, free with LDNS_FREE() */ uint8_t * ldns_nsec3_salt_data(const ldns_rr *nsec3_rr) { uint8_t salt_length; uint8_t *salt; ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr); if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) { salt_length = ldns_rdf_data(salt_rdf)[0]; salt = LDNS_XMALLOC(uint8_t, salt_length); if(!salt) return NULL; memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length); return salt; } return NULL; } ldns_rdf * ldns_nsec3_next_owner(const ldns_rr *nsec3_rr) { if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) { return NULL; } else { return ldns_rr_rdf(nsec3_rr, 4); } } ldns_rdf * ldns_nsec3_bitmap(const ldns_rr *nsec3_rr) { if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) { return NULL; } else { return ldns_rr_rdf(nsec3_rr, 5); } } ldns_rdf * ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, ldns_rdf *name) { uint8_t algorithm; uint16_t iterations; uint8_t salt_length; uint8_t *salt = 0; ldns_rdf *hashed_owner; algorithm = ldns_nsec3_algorithm(nsec); salt_length = ldns_nsec3_salt_length(nsec); salt = ldns_nsec3_salt_data(nsec); iterations = ldns_nsec3_iterations(nsec); hashed_owner = ldns_nsec3_hash_name(name, algorithm, iterations, salt_length, salt); LDNS_FREE(salt); return hashed_owner; } bool ldns_nsec_bitmap_covers_type(const ldns_rdf *nsec_bitmap, ldns_rr_type type) { uint8_t window_block_nr; uint8_t bitmap_length; uint16_t cur_type; uint16_t pos = 0; uint16_t bit_pos; uint8_t *data; if (nsec_bitmap == NULL) { return false; } data = ldns_rdf_data(nsec_bitmap); while(pos < ldns_rdf_size(nsec_bitmap)) { window_block_nr = data[pos]; bitmap_length = data[pos + 1]; pos += 2; for (bit_pos = 0; bit_pos < (bitmap_length) * 8; bit_pos++) { if (ldns_get_bit(&data[pos], bit_pos)) { cur_type = 256 * (uint16_t) window_block_nr + bit_pos; if (cur_type == type) { return true; } } } pos += (uint16_t) bitmap_length; } return false; } bool ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name) { ldns_rdf *nsec_owner = ldns_rr_owner(nsec); ldns_rdf *hash_next; char *next_hash_str; ldns_rdf *nsec_next = NULL; ldns_status status; ldns_rdf *chopped_dname; bool result; if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) { if (ldns_rr_rdf(nsec, 0) != NULL) { nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0)); } else { return false; } } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) { hash_next = ldns_nsec3_next_owner(nsec); next_hash_str = ldns_rdf2str(hash_next); nsec_next = ldns_dname_new_frm_str(next_hash_str); LDNS_FREE(next_hash_str); chopped_dname = ldns_dname_left_chop(nsec_owner); status = ldns_dname_cat(nsec_next, chopped_dname); ldns_rdf_deep_free(chopped_dname); if (status != LDNS_STATUS_OK) { printf("error catting: %s\n", ldns_get_errorstr_by_id(status)); } } else { ldns_rdf_deep_free(nsec_next); return false; } /* in the case of the last nsec */ if(ldns_dname_compare(nsec_owner, nsec_next) > 0) { result = (ldns_dname_compare(nsec_owner, name) <= 0 || ldns_dname_compare(name, nsec_next) < 0); } else { result = (ldns_dname_compare(nsec_owner, name) <= 0 && ldns_dname_compare(name, nsec_next) < 0); } ldns_rdf_deep_free(nsec_next); return result; } #ifdef HAVE_SSL /* sig may be null - if so look in the packet */ ldns_status ldns_pkt_verify_time(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, ldns_rr_list *k, ldns_rr_list *s, time_t check_time, ldns_rr_list *good_keys) { ldns_rr_list *rrset; ldns_rr_list *sigs; ldns_rr_list *sigs_covered; ldns_rdf *rdf_t; ldns_rr_type t_netorder; if (!k) { return LDNS_STATUS_ERR; /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */ } if (t == LDNS_RR_TYPE_RRSIG) { /* we don't have RRSIG(RRSIG) (yet? ;-) ) */ return LDNS_STATUS_ERR; } if (s) { /* if s is not NULL, the sigs are given to use */ sigs = s; } else { /* otherwise get them from the packet */ sigs = ldns_pkt_rr_list_by_name_and_type(p, o, LDNS_RR_TYPE_RRSIG, LDNS_SECTION_ANY_NOQUESTION); if (!sigs) { /* no sigs */ return LDNS_STATUS_ERR; /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */ } } /* rrsig are subtyped, so now we need to find the correct * sigs for the type t */ t_netorder = htons(t); /* rdf are in network order! */ /* a type identifier is a 16-bit number, so the size is 2 bytes */ rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 2, &t_netorder); sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0); rrset = ldns_pkt_rr_list_by_name_and_type(p, o, t, LDNS_SECTION_ANY_NOQUESTION); if (!rrset) { return LDNS_STATUS_ERR; } if (!sigs_covered) { return LDNS_STATUS_ERR; } return ldns_verify_time(rrset, sigs, k, check_time, good_keys); } ldns_status ldns_pkt_verify(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, ldns_rr_list *k, ldns_rr_list *s, ldns_rr_list *good_keys) { return ldns_pkt_verify_time(p, t, o, k, s, ldns_time(NULL), good_keys); } #endif /* HAVE_SSL */ ldns_status ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs) { size_t i; char *next_nsec_owner_str; ldns_rdf *next_nsec_owner_label; ldns_rdf *next_nsec_rdf; ldns_status status = LDNS_STATUS_OK; for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) { if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) { next_nsec_owner_label = ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs, 0)), 0); next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label); if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1] == '.') { next_nsec_owner_str[strlen(next_nsec_owner_str) - 1] = '\0'; } status = ldns_str2rdf_b32_ext(&next_nsec_rdf, next_nsec_owner_str); if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i), next_nsec_rdf, 4)) { /* todo: error */ } ldns_rdf_deep_free(next_nsec_owner_label); LDNS_FREE(next_nsec_owner_str); } else { next_nsec_owner_label = ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs, i + 1)), 0); next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label); if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1] == '.') { next_nsec_owner_str[strlen(next_nsec_owner_str) - 1] = '\0'; } status = ldns_str2rdf_b32_ext(&next_nsec_rdf, next_nsec_owner_str); ldns_rdf_deep_free(next_nsec_owner_label); LDNS_FREE(next_nsec_owner_str); if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i), next_nsec_rdf, 4)) { /* todo: error */ } } } return status; } int qsort_rr_compare_nsec3(const void *a, const void *b) { const ldns_rr *rr1 = * (const ldns_rr **) a; const ldns_rr *rr2 = * (const ldns_rr **) b; if (rr1 == NULL && rr2 == NULL) { return 0; } if (rr1 == NULL) { return -1; } if (rr2 == NULL) { return 1; } return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2)); } void ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted) { qsort(unsorted->_rrs, ldns_rr_list_rr_count(unsorted), sizeof(ldns_rr *), qsort_rr_compare_nsec3); } int ldns_dnssec_default_add_to_signatures( ATTR_UNUSED(ldns_rr *sig) , ATTR_UNUSED(void *n) ) { return LDNS_SIGNATURE_LEAVE_ADD_NEW; } int ldns_dnssec_default_leave_signatures( ATTR_UNUSED(ldns_rr *sig) , ATTR_UNUSED(void *n) ) { return LDNS_SIGNATURE_LEAVE_NO_ADD; } int ldns_dnssec_default_delete_signatures( ATTR_UNUSED(ldns_rr *sig) , ATTR_UNUSED(void *n) ) { return LDNS_SIGNATURE_REMOVE_NO_ADD; } int ldns_dnssec_default_replace_signatures( ATTR_UNUSED(ldns_rr *sig) , ATTR_UNUSED(void *n) ) { return LDNS_SIGNATURE_REMOVE_ADD_NEW; } #ifdef HAVE_SSL ldns_rdf * ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len) { ldns_rdf *sigdata_rdf; DSA_SIG *dsasig; unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig); size_t byte_offset; dsasig = d2i_DSA_SIG(NULL, (const unsigned char **)&dsasig_data, sig_len); if (!dsasig) { DSA_SIG_free(dsasig); return NULL; } dsasig_data = LDNS_XMALLOC(unsigned char, 41); if(!dsasig_data) { DSA_SIG_free(dsasig); return NULL; } dsasig_data[0] = 0; byte_offset = (size_t) (20 - BN_num_bytes(dsasig->r)); if (byte_offset > 20) { DSA_SIG_free(dsasig); LDNS_FREE(dsasig_data); return NULL; } memset(&dsasig_data[1], 0, byte_offset); BN_bn2bin(dsasig->r, &dsasig_data[1 + byte_offset]); byte_offset = (size_t) (20 - BN_num_bytes(dsasig->s)); if (byte_offset > 20) { DSA_SIG_free(dsasig); LDNS_FREE(dsasig_data); return NULL; } memset(&dsasig_data[21], 0, byte_offset); BN_bn2bin(dsasig->s, &dsasig_data[21 + byte_offset]); sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data); if(!sigdata_rdf) { LDNS_FREE(dsasig_data); } DSA_SIG_free(dsasig); return sigdata_rdf; } ldns_status ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer, const ldns_rdf *sig_rdf) { /* the EVP api wants the DER encoding of the signature... */ BIGNUM *R, *S; DSA_SIG *dsasig; unsigned char *raw_sig = NULL; int raw_sig_len; if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH) return LDNS_STATUS_SYNTAX_RDATA_ERR; /* extract the R and S field from the sig buffer */ R = BN_new(); if(!R) return LDNS_STATUS_MEM_ERR; (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1, SHA_DIGEST_LENGTH, R); S = BN_new(); if(!S) { BN_free(R); return LDNS_STATUS_MEM_ERR; } (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21, SHA_DIGEST_LENGTH, S); dsasig = DSA_SIG_new(); if (!dsasig) { BN_free(R); BN_free(S); return LDNS_STATUS_MEM_ERR; } dsasig->r = R; dsasig->s = S; raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig); if (raw_sig_len < 0) { DSA_SIG_free(dsasig); free(raw_sig); return LDNS_STATUS_SSL_ERR; } if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) { ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len); } DSA_SIG_free(dsasig); free(raw_sig); return ldns_buffer_status(target_buffer); } #ifdef USE_ECDSA #ifndef S_SPLINT_S ldns_rdf * ldns_convert_ecdsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len) { ECDSA_SIG* ecdsa_sig; unsigned char *data = (unsigned char*)ldns_buffer_begin(sig); ldns_rdf* rdf; ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len); if(!ecdsa_sig) return NULL; /* "r | s". */ data = LDNS_XMALLOC(unsigned char, BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s)); if(!data) { ECDSA_SIG_free(ecdsa_sig); return NULL; } BN_bn2bin(ecdsa_sig->r, data); BN_bn2bin(ecdsa_sig->s, data+BN_num_bytes(ecdsa_sig->r)); rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, (size_t)( BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s)), data); ECDSA_SIG_free(ecdsa_sig); return rdf; } ldns_status ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer, const ldns_rdf *sig_rdf) { ECDSA_SIG* sig; int raw_sig_len; long bnsize = (long)ldns_rdf_size(sig_rdf) / 2; /* if too short, or not even length, do not bother */ if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf)) return LDNS_STATUS_ERR; /* use the raw data to parse two evenly long BIGNUMs, "r | s". */ sig = ECDSA_SIG_new(); if(!sig) return LDNS_STATUS_MEM_ERR; sig->r = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf), bnsize, sig->r); sig->s = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf)+bnsize, bnsize, sig->s); if(!sig->r || !sig->s) { ECDSA_SIG_free(sig); return LDNS_STATUS_MEM_ERR; } raw_sig_len = i2d_ECDSA_SIG(sig, NULL); if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) { unsigned char* pp = (unsigned char*) ldns_buffer_current(target_buffer); raw_sig_len = i2d_ECDSA_SIG(sig, &pp); ldns_buffer_skip(target_buffer, (ssize_t) raw_sig_len); } ECDSA_SIG_free(sig); return ldns_buffer_status(target_buffer); } #endif /* S_SPLINT_S */ #endif /* USE_ECDSA */ #endif /* HAVE_SSL */