1770 lines
43 KiB
C
1770 lines
43 KiB
C
/*
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* dnssec.c
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*
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* contains the cryptographic function needed for DNSSEC in ldns
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* The crypto library used is openssl
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*
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* (c) NLnet Labs, 2004-2008
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*
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* See the file LICENSE for the license
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*/
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#include <ldns/config.h>
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#include <ldns/ldns.h>
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#include <ldns/dnssec.h>
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#include <strings.h>
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#include <time.h>
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#ifdef HAVE_SSL
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#include <openssl/ssl.h>
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#include <openssl/evp.h>
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#include <openssl/rand.h>
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#include <openssl/err.h>
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#include <openssl/md5.h>
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#endif
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ldns_rr *
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ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name,
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const ldns_rr_type type,
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const ldns_rr_list *rrs)
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{
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size_t i;
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ldns_rr *candidate;
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if (!name || !rrs) {
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return NULL;
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}
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for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
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candidate = ldns_rr_list_rr(rrs, i);
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if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_RRSIG) {
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if (ldns_dname_compare(ldns_rr_owner(candidate),
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name) == 0 &&
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ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(candidate))
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== type
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) {
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return candidate;
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}
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}
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}
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return NULL;
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}
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ldns_rr *
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ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig,
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const ldns_rr_list *rrs)
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{
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size_t i;
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ldns_rr *candidate;
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if (!rrsig || !rrs) {
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return NULL;
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}
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for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
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candidate = ldns_rr_list_rr(rrs, i);
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if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_DNSKEY) {
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if (ldns_dname_compare(ldns_rr_owner(candidate),
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ldns_rr_rrsig_signame(rrsig)) == 0 &&
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ldns_rdf2native_int16(ldns_rr_rrsig_keytag(rrsig)) ==
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ldns_calc_keytag(candidate)
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) {
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return candidate;
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}
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}
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}
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return NULL;
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}
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ldns_rdf *
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ldns_nsec_get_bitmap(ldns_rr *nsec) {
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if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
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return ldns_rr_rdf(nsec, 1);
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} else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
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return ldns_rr_rdf(nsec, 5);
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} else {
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return NULL;
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}
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}
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/*return the owner name of the closest encloser for name from the list of rrs */
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/* this is NOT the hash, but the original name! */
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ldns_rdf *
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ldns_dnssec_nsec3_closest_encloser(ldns_rdf *qname,
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ATTR_UNUSED(ldns_rr_type qtype),
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ldns_rr_list *nsec3s)
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{
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/* remember parameters, they must match */
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uint8_t algorithm;
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uint32_t iterations;
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uint8_t salt_length;
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uint8_t *salt;
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ldns_rdf *sname, *hashed_sname, *tmp;
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bool flag;
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bool exact_match_found;
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bool in_range_found;
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ldns_status status;
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ldns_rdf *zone_name;
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size_t nsec_i;
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ldns_rr *nsec;
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ldns_rdf *result = NULL;
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if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) {
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return NULL;
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}
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nsec = ldns_rr_list_rr(nsec3s, 0);
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algorithm = ldns_nsec3_algorithm(nsec);
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salt_length = ldns_nsec3_salt_length(nsec);
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salt = ldns_nsec3_salt_data(nsec);
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iterations = ldns_nsec3_iterations(nsec);
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sname = ldns_rdf_clone(qname);
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flag = false;
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zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec));
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/* algorithm from nsec3-07 8.3 */
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while (ldns_dname_label_count(sname) > 0) {
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exact_match_found = false;
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in_range_found = false;
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hashed_sname = ldns_nsec3_hash_name(sname,
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algorithm,
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iterations,
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salt_length,
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salt);
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status = ldns_dname_cat(hashed_sname, zone_name);
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if(status != LDNS_STATUS_OK) {
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LDNS_FREE(salt);
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ldns_rdf_deep_free(zone_name);
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ldns_rdf_deep_free(sname);
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return NULL;
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}
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for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) {
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nsec = ldns_rr_list_rr(nsec3s, nsec_i);
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/* check values of iterations etc! */
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/* exact match? */
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if (ldns_dname_compare(ldns_rr_owner(nsec), hashed_sname) == 0) {
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exact_match_found = true;
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} else if (ldns_nsec_covers_name(nsec, hashed_sname)) {
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in_range_found = true;
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}
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}
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if (!exact_match_found && in_range_found) {
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flag = true;
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} else if (exact_match_found && flag) {
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result = ldns_rdf_clone(sname);
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/* RFC 5155: 8.3. 2.** "The proof is complete" */
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ldns_rdf_deep_free(hashed_sname);
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goto done;
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} else if (exact_match_found && !flag) {
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/* error! */
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ldns_rdf_deep_free(hashed_sname);
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goto done;
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} else {
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flag = false;
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}
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ldns_rdf_deep_free(hashed_sname);
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tmp = sname;
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sname = ldns_dname_left_chop(sname);
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ldns_rdf_deep_free(tmp);
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}
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done:
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LDNS_FREE(salt);
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ldns_rdf_deep_free(zone_name);
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ldns_rdf_deep_free(sname);
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return result;
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}
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bool
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ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt)
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{
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size_t i;
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for (i = 0; i < ldns_pkt_ancount(pkt); i++) {
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if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_answer(pkt), i)) ==
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LDNS_RR_TYPE_RRSIG) {
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return true;
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}
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}
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for (i = 0; i < ldns_pkt_nscount(pkt); i++) {
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if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_authority(pkt), i)) ==
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LDNS_RR_TYPE_RRSIG) {
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return true;
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}
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}
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return false;
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}
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ldns_rr_list *
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ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt,
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ldns_rdf *name,
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ldns_rr_type type)
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{
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uint16_t t_netorder;
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ldns_rr_list *sigs;
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ldns_rr_list *sigs_covered;
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ldns_rdf *rdf_t;
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sigs = ldns_pkt_rr_list_by_name_and_type(pkt,
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name,
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LDNS_RR_TYPE_RRSIG,
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LDNS_SECTION_ANY_NOQUESTION
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);
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t_netorder = htons(type); /* rdf are in network order! */
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rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, LDNS_RDF_SIZE_WORD, &t_netorder);
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sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
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ldns_rdf_free(rdf_t);
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ldns_rr_list_deep_free(sigs);
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return sigs_covered;
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}
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ldns_rr_list *
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ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type)
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{
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uint16_t t_netorder;
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ldns_rr_list *sigs;
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ldns_rr_list *sigs_covered;
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ldns_rdf *rdf_t;
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sigs = ldns_pkt_rr_list_by_type(pkt,
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LDNS_RR_TYPE_RRSIG,
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LDNS_SECTION_ANY_NOQUESTION
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);
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t_netorder = htons(type); /* rdf are in network order! */
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rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
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2,
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&t_netorder);
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sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
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ldns_rdf_free(rdf_t);
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ldns_rr_list_deep_free(sigs);
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return sigs_covered;
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}
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/* used only on the public key RR */
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uint16_t
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ldns_calc_keytag(const ldns_rr *key)
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{
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uint16_t ac16;
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ldns_buffer *keybuf;
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size_t keysize;
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if (!key) {
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return 0;
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}
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if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY &&
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ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY
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) {
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return 0;
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}
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/* rdata to buf - only put the rdata in a buffer */
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keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */
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if (!keybuf) {
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return 0;
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}
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(void)ldns_rr_rdata2buffer_wire(keybuf, key);
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/* the current pos in the buffer is the keysize */
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keysize= ldns_buffer_position(keybuf);
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ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize);
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ldns_buffer_free(keybuf);
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return ac16;
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}
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uint16_t ldns_calc_keytag_raw(uint8_t* key, size_t keysize)
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{
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unsigned int i;
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uint32_t ac32;
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uint16_t ac16;
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if(keysize < 4) {
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return 0;
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}
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/* look at the algorithm field, copied from 2535bis */
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if (key[3] == LDNS_RSAMD5) {
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ac16 = 0;
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if (keysize > 4) {
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memmove(&ac16, key + keysize - 3, 2);
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}
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ac16 = ntohs(ac16);
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return (uint16_t) ac16;
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} else {
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ac32 = 0;
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for (i = 0; (size_t)i < keysize; ++i) {
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ac32 += (i & 1) ? key[i] : key[i] << 8;
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}
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ac32 += (ac32 >> 16) & 0xFFFF;
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return (uint16_t) (ac32 & 0xFFFF);
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}
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}
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#ifdef HAVE_SSL
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DSA *
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ldns_key_buf2dsa(ldns_buffer *key)
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{
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return ldns_key_buf2dsa_raw((unsigned char*)ldns_buffer_begin(key),
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ldns_buffer_position(key));
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}
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DSA *
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ldns_key_buf2dsa_raw(unsigned char* key, size_t len)
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{
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uint8_t T;
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uint16_t length;
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uint16_t offset;
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DSA *dsa;
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BIGNUM *Q; BIGNUM *P;
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BIGNUM *G; BIGNUM *Y;
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if(len == 0)
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return NULL;
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T = (uint8_t)key[0];
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length = (64 + T * 8);
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offset = 1;
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if (T > 8) {
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return NULL;
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}
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if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length)
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return NULL;
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Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL);
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offset += SHA_DIGEST_LENGTH;
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P = BN_bin2bn(key+offset, (int)length, NULL);
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offset += length;
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G = BN_bin2bn(key+offset, (int)length, NULL);
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offset += length;
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Y = BN_bin2bn(key+offset, (int)length, NULL);
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offset += length;
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/* create the key and set its properties */
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if(!Q || !P || !G || !Y || !(dsa = DSA_new())) {
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BN_free(Q);
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BN_free(P);
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BN_free(G);
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BN_free(Y);
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return NULL;
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}
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#ifndef S_SPLINT_S
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dsa->p = P;
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dsa->q = Q;
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dsa->g = G;
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dsa->pub_key = Y;
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#endif /* splint */
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return dsa;
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}
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RSA *
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ldns_key_buf2rsa(ldns_buffer *key)
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{
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return ldns_key_buf2rsa_raw((unsigned char*)ldns_buffer_begin(key),
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ldns_buffer_position(key));
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}
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RSA *
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ldns_key_buf2rsa_raw(unsigned char* key, size_t len)
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{
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uint16_t offset;
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uint16_t exp;
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uint16_t int16;
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RSA *rsa;
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BIGNUM *modulus;
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BIGNUM *exponent;
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if (len == 0)
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return NULL;
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if (key[0] == 0) {
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if(len < 3)
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return NULL;
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/* need some smart comment here XXX*/
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/* the exponent is too large so it's places
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* futher...???? */
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memmove(&int16, key+1, 2);
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exp = ntohs(int16);
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offset = 3;
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} else {
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exp = key[0];
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offset = 1;
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}
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/* key length at least one */
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if(len < (size_t)offset + exp + 1)
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return NULL;
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|
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/* Exponent */
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exponent = BN_new();
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if(!exponent) return NULL;
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(void) BN_bin2bn(key+offset, (int)exp, exponent);
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offset += exp;
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|
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/* Modulus */
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modulus = BN_new();
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if(!modulus) {
|
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BN_free(exponent);
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return NULL;
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}
|
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/* length of the buffer must match the key length! */
|
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(void) BN_bin2bn(key+offset, (int)(len - offset), modulus);
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|
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rsa = RSA_new();
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if(!rsa) {
|
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BN_free(exponent);
|
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BN_free(modulus);
|
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return NULL;
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}
|
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#ifndef S_SPLINT_S
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rsa->n = modulus;
|
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rsa->e = exponent;
|
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#endif /* splint */
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|
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return rsa;
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}
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|
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int
|
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ldns_digest_evp(unsigned char* data, unsigned int len, unsigned char* dest,
|
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const EVP_MD* md)
|
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{
|
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EVP_MD_CTX* ctx;
|
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ctx = EVP_MD_CTX_create();
|
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if(!ctx)
|
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return false;
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if(!EVP_DigestInit_ex(ctx, md, NULL) ||
|
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!EVP_DigestUpdate(ctx, data, len) ||
|
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!EVP_DigestFinal_ex(ctx, dest, NULL)) {
|
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EVP_MD_CTX_destroy(ctx);
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return false;
|
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}
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|
EVP_MD_CTX_destroy(ctx);
|
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return true;
|
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}
|
|
#endif /* HAVE_SSL */
|
|
|
|
ldns_rr *
|
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ldns_key_rr2ds(const ldns_rr *key, ldns_hash h)
|
|
{
|
|
ldns_rdf *tmp;
|
|
ldns_rr *ds;
|
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uint16_t keytag;
|
|
uint8_t sha1hash;
|
|
uint8_t *digest;
|
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ldns_buffer *data_buf;
|
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#ifdef USE_GOST
|
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const EVP_MD* md = NULL;
|
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#endif
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|
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if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) {
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return NULL;
|
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}
|
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|
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ds = ldns_rr_new();
|
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if (!ds) {
|
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return NULL;
|
|
}
|
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ldns_rr_set_type(ds, LDNS_RR_TYPE_DS);
|
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ldns_rr_set_owner(ds, ldns_rdf_clone(
|
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ldns_rr_owner(key)));
|
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ldns_rr_set_ttl(ds, ldns_rr_ttl(key));
|
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ldns_rr_set_class(ds, ldns_rr_get_class(key));
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|
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switch(h) {
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default:
|
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case LDNS_SHA1:
|
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digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH);
|
|
if (!digest) {
|
|
ldns_rr_free(ds);
|
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return NULL;
|
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}
|
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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) {
|
|
ldns_rdf_deep_free(hashed_owner);
|
|
return NULL;
|
|
}
|
|
nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
|
|
if(!nsec) {
|
|
ldns_rdf_deep_free(hashed_owner);
|
|
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);
|
|
ldns_rdf_free(rdf_t);
|
|
if (! sigs_covered) {
|
|
if (! s) {
|
|
ldns_rr_list_deep_free(sigs);
|
|
}
|
|
return LDNS_STATUS_ERR;
|
|
}
|
|
ldns_rr_list_deep_free(sigs_covered);
|
|
|
|
rrset = ldns_pkt_rr_list_by_name_and_type(p, o, t,
|
|
LDNS_SECTION_ANY_NOQUESTION);
|
|
if (!rrset) {
|
|
if (! s) {
|
|
ldns_rr_list_deep_free(sigs);
|
|
}
|
|
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 */
|