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-rw-r--r--lib/dns/nsec3.c2195
1 files changed, 2195 insertions, 0 deletions
diff --git a/lib/dns/nsec3.c b/lib/dns/nsec3.c
new file mode 100644
index 0000000..b9fc699
--- /dev/null
+++ b/lib/dns/nsec3.c
@@ -0,0 +1,2195 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <isc/base32.h>
+#include <isc/buffer.h>
+#include <isc/hex.h>
+#include <isc/iterated_hash.h>
+#include <isc/md.h>
+#include <isc/nonce.h>
+#include <isc/result.h>
+#include <isc/safe.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include <dns/compress.h>
+#include <dns/db.h>
+#include <dns/dbiterator.h>
+#include <dns/diff.h>
+#include <dns/fixedname.h>
+#include <dns/nsec.h>
+#include <dns/nsec3.h>
+#include <dns/rdata.h>
+#include <dns/rdatalist.h>
+#include <dns/rdataset.h>
+#include <dns/rdatasetiter.h>
+#include <dns/rdatastruct.h>
+#include <dns/zone.h>
+
+#include <dst/dst.h>
+
+#define CHECK(x) \
+ do { \
+ result = (x); \
+ if (result != ISC_R_SUCCESS) \
+ goto failure; \
+ } while (0)
+
+#define OPTOUT(x) (((x)&DNS_NSEC3FLAG_OPTOUT) != 0)
+#define CREATE(x) (((x)&DNS_NSEC3FLAG_CREATE) != 0)
+#define INITIAL(x) (((x)&DNS_NSEC3FLAG_INITIAL) != 0)
+#define REMOVE(x) (((x)&DNS_NSEC3FLAG_REMOVE) != 0)
+
+isc_result_t
+dns_nsec3_buildrdata(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node,
+ unsigned int hashalg, unsigned int flags,
+ unsigned int iterations, const unsigned char *salt,
+ size_t salt_length, const unsigned char *nexthash,
+ size_t hash_length, unsigned char *buffer,
+ dns_rdata_t *rdata) {
+ isc_result_t result;
+ dns_rdataset_t rdataset;
+ isc_region_t r;
+ unsigned int i;
+ bool found;
+ bool found_ns;
+ bool need_rrsig;
+
+ unsigned char *nsec_bits, *bm;
+ unsigned int max_type;
+ dns_rdatasetiter_t *rdsiter;
+ unsigned char *p;
+
+ REQUIRE(salt_length < 256U);
+ REQUIRE(hash_length < 256U);
+ REQUIRE(flags <= 0xffU);
+ REQUIRE(hashalg <= 0xffU);
+ REQUIRE(iterations <= 0xffffU);
+
+ switch (hashalg) {
+ case dns_hash_sha1:
+ REQUIRE(hash_length == ISC_SHA1_DIGESTLENGTH);
+ break;
+ }
+
+ memset(buffer, 0, DNS_NSEC3_BUFFERSIZE);
+
+ p = buffer;
+
+ *p++ = hashalg;
+ *p++ = flags;
+
+ *p++ = iterations >> 8;
+ *p++ = iterations;
+
+ *p++ = (unsigned char)salt_length;
+ memmove(p, salt, salt_length);
+ p += salt_length;
+
+ *p++ = (unsigned char)hash_length;
+ memmove(p, nexthash, hash_length);
+ p += hash_length;
+
+ r.length = (unsigned int)(p - buffer);
+ r.base = buffer;
+
+ /*
+ * Use the end of the space for a raw bitmap leaving enough
+ * space for the window identifiers and length octets.
+ */
+ bm = r.base + r.length + 512;
+ nsec_bits = r.base + r.length;
+ max_type = 0;
+ if (node == NULL) {
+ goto collapse_bitmap;
+ }
+ dns_rdataset_init(&rdataset);
+ rdsiter = NULL;
+ result = dns_db_allrdatasets(db, node, version, 0, 0, &rdsiter);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ found = found_ns = need_rrsig = false;
+ for (result = dns_rdatasetiter_first(rdsiter); result == ISC_R_SUCCESS;
+ result = dns_rdatasetiter_next(rdsiter))
+ {
+ dns_rdatasetiter_current(rdsiter, &rdataset);
+ if (rdataset.type != dns_rdatatype_nsec &&
+ rdataset.type != dns_rdatatype_nsec3 &&
+ rdataset.type != dns_rdatatype_rrsig)
+ {
+ if (rdataset.type > max_type) {
+ max_type = rdataset.type;
+ }
+ dns_nsec_setbit(bm, rdataset.type, 1);
+ /*
+ * Work out if we need to set the RRSIG bit for
+ * this node. We set the RRSIG bit if either of
+ * the following conditions are met:
+ * 1) We have a SOA or DS then we need to set
+ * the RRSIG bit as both always will be signed.
+ * 2) We set the RRSIG bit if we don't have
+ * a NS record but do have other data.
+ */
+ if (rdataset.type == dns_rdatatype_soa ||
+ rdataset.type == dns_rdatatype_ds)
+ {
+ need_rrsig = true;
+ } else if (rdataset.type == dns_rdatatype_ns) {
+ found_ns = true;
+ } else {
+ found = true;
+ }
+ }
+ dns_rdataset_disassociate(&rdataset);
+ }
+ if ((found && !found_ns) || need_rrsig) {
+ if (dns_rdatatype_rrsig > max_type) {
+ max_type = dns_rdatatype_rrsig;
+ }
+ dns_nsec_setbit(bm, dns_rdatatype_rrsig, 1);
+ }
+
+ /*
+ * At zone cuts, deny the existence of glue in the parent zone.
+ */
+ if (dns_nsec_isset(bm, dns_rdatatype_ns) &&
+ !dns_nsec_isset(bm, dns_rdatatype_soa))
+ {
+ for (i = 0; i <= max_type; i++) {
+ if (dns_nsec_isset(bm, i) &&
+ !dns_rdatatype_iszonecutauth((dns_rdatatype_t)i))
+ {
+ dns_nsec_setbit(bm, i, 0);
+ }
+ }
+ }
+
+ dns_rdatasetiter_destroy(&rdsiter);
+ if (result != ISC_R_NOMORE) {
+ return (result);
+ }
+
+collapse_bitmap:
+ nsec_bits += dns_nsec_compressbitmap(nsec_bits, bm, max_type);
+ r.length = (unsigned int)(nsec_bits - r.base);
+ INSIST(r.length <= DNS_NSEC3_BUFFERSIZE);
+ dns_rdata_fromregion(rdata, dns_db_class(db), dns_rdatatype_nsec3, &r);
+
+ return (ISC_R_SUCCESS);
+}
+
+bool
+dns_nsec3_typepresent(dns_rdata_t *rdata, dns_rdatatype_t type) {
+ dns_rdata_nsec3_t nsec3;
+ isc_result_t result;
+ bool present;
+ unsigned int i, len, window;
+
+ REQUIRE(rdata != NULL);
+ REQUIRE(rdata->type == dns_rdatatype_nsec3);
+
+ /* This should never fail */
+ result = dns_rdata_tostruct(rdata, &nsec3, NULL);
+ INSIST(result == ISC_R_SUCCESS);
+
+ present = false;
+ for (i = 0; i < nsec3.len; i += len) {
+ INSIST(i + 2 <= nsec3.len);
+ window = nsec3.typebits[i];
+ len = nsec3.typebits[i + 1];
+ INSIST(len > 0 && len <= 32);
+ i += 2;
+ INSIST(i + len <= nsec3.len);
+ if (window * 256 > type) {
+ break;
+ }
+ if ((window + 1) * 256 <= type) {
+ continue;
+ }
+ if (type < (window * 256) + len * 8) {
+ present = dns_nsec_isset(&nsec3.typebits[i],
+ type % 256);
+ }
+ break;
+ }
+ dns_rdata_freestruct(&nsec3);
+ return (present);
+}
+
+isc_result_t
+dns_nsec3_generate_salt(unsigned char *salt, size_t saltlen) {
+ if (saltlen > 255U) {
+ return (ISC_R_RANGE);
+ }
+ isc_nonce_buf(salt, saltlen);
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_nsec3_hashname(dns_fixedname_t *result,
+ unsigned char rethash[NSEC3_MAX_HASH_LENGTH],
+ size_t *hash_length, const dns_name_t *name,
+ const dns_name_t *origin, dns_hash_t hashalg,
+ unsigned int iterations, const unsigned char *salt,
+ size_t saltlength) {
+ unsigned char hash[NSEC3_MAX_HASH_LENGTH];
+ unsigned char nametext[DNS_NAME_FORMATSIZE];
+ dns_fixedname_t fixed;
+ dns_name_t *downcased;
+ isc_buffer_t namebuffer;
+ isc_region_t region;
+ size_t len;
+
+ if (rethash == NULL) {
+ rethash = hash;
+ }
+
+ memset(rethash, 0, NSEC3_MAX_HASH_LENGTH);
+
+ downcased = dns_fixedname_initname(&fixed);
+ dns_name_downcase(name, downcased, NULL);
+
+ /* hash the node name */
+ len = isc_iterated_hash(rethash, hashalg, iterations, salt,
+ (int)saltlength, downcased->ndata,
+ downcased->length);
+ if (len == 0U) {
+ return (DNS_R_BADALG);
+ }
+
+ if (hash_length != NULL) {
+ *hash_length = len;
+ }
+
+ /* convert the hash to base32hex non-padded */
+ region.base = rethash;
+ region.length = (unsigned int)len;
+ isc_buffer_init(&namebuffer, nametext, sizeof nametext);
+ isc_base32hexnp_totext(&region, 1, "", &namebuffer);
+
+ /* convert the hex to a domain name */
+ dns_fixedname_init(result);
+ return (dns_name_fromtext(dns_fixedname_name(result), &namebuffer,
+ origin, 0, NULL));
+}
+
+unsigned int
+dns_nsec3_hashlength(dns_hash_t hash) {
+ switch (hash) {
+ case dns_hash_sha1:
+ return (ISC_SHA1_DIGESTLENGTH);
+ }
+ return (0);
+}
+
+bool
+dns_nsec3_supportedhash(dns_hash_t hash) {
+ switch (hash) {
+ case dns_hash_sha1:
+ return (true);
+ }
+ return (false);
+}
+
+/*%
+ * Update a single RR in version 'ver' of 'db' and log the
+ * update in 'diff'.
+ *
+ * Ensures:
+ * \li '*tuple' == NULL. Either the tuple is freed, or its
+ * ownership has been transferred to the diff.
+ */
+static isc_result_t
+do_one_tuple(dns_difftuple_t **tuple, dns_db_t *db, dns_dbversion_t *ver,
+ dns_diff_t *diff) {
+ dns_diff_t temp_diff;
+ isc_result_t result;
+
+ /*
+ * Create a singleton diff.
+ */
+ dns_diff_init(diff->mctx, &temp_diff);
+ ISC_LIST_APPEND(temp_diff.tuples, *tuple, link);
+
+ /*
+ * Apply it to the database.
+ */
+ result = dns_diff_apply(&temp_diff, db, ver);
+ ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link);
+ if (result != ISC_R_SUCCESS) {
+ dns_difftuple_free(tuple);
+ return (result);
+ }
+
+ /*
+ * Merge it into the current pending journal entry.
+ */
+ dns_diff_appendminimal(diff, tuple);
+
+ /*
+ * Do not clear temp_diff.
+ */
+ return (ISC_R_SUCCESS);
+}
+
+/*%
+ * Set '*exists' to true iff the given name exists, to false otherwise.
+ */
+static isc_result_t
+name_exists(dns_db_t *db, dns_dbversion_t *version, const dns_name_t *name,
+ bool *exists) {
+ isc_result_t result;
+ dns_dbnode_t *node = NULL;
+ dns_rdatasetiter_t *iter = NULL;
+
+ result = dns_db_findnode(db, name, false, &node);
+ if (result == ISC_R_NOTFOUND) {
+ *exists = false;
+ return (ISC_R_SUCCESS);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ result = dns_db_allrdatasets(db, node, version, 0, (isc_stdtime_t)0,
+ &iter);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup_node;
+ }
+
+ result = dns_rdatasetiter_first(iter);
+ if (result == ISC_R_SUCCESS) {
+ *exists = true;
+ } else if (result == ISC_R_NOMORE) {
+ *exists = false;
+ result = ISC_R_SUCCESS;
+ } else {
+ *exists = false;
+ }
+ dns_rdatasetiter_destroy(&iter);
+
+cleanup_node:
+ dns_db_detachnode(db, &node);
+ return (result);
+}
+
+static bool
+match_nsec3param(const dns_rdata_nsec3_t *nsec3,
+ const dns_rdata_nsec3param_t *nsec3param) {
+ if (nsec3->hash == nsec3param->hash &&
+ nsec3->iterations == nsec3param->iterations &&
+ nsec3->salt_length == nsec3param->salt_length &&
+ !memcmp(nsec3->salt, nsec3param->salt, nsec3->salt_length))
+ {
+ return (true);
+ }
+ return (false);
+}
+
+/*%
+ * Delete NSEC3 records at "name" which match "param", recording the
+ * change in "diff".
+ */
+static isc_result_t
+delnsec3(dns_db_t *db, dns_dbversion_t *version, const dns_name_t *name,
+ const dns_rdata_nsec3param_t *nsec3param, dns_diff_t *diff) {
+ dns_dbnode_t *node = NULL;
+ dns_difftuple_t *tuple = NULL;
+ dns_rdata_nsec3_t nsec3;
+ dns_rdataset_t rdataset;
+ isc_result_t result;
+
+ result = dns_db_findnsec3node(db, name, false, &node);
+ if (result == ISC_R_NOTFOUND) {
+ return (ISC_R_SUCCESS);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ dns_rdataset_init(&rdataset);
+ result = dns_db_findrdataset(db, node, version, dns_rdatatype_nsec3, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+
+ if (result == ISC_R_NOTFOUND) {
+ result = ISC_R_SUCCESS;
+ goto cleanup_node;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup_node;
+ }
+
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdataset_current(&rdataset, &rdata);
+ CHECK(dns_rdata_tostruct(&rdata, &nsec3, NULL));
+
+ if (!match_nsec3param(&nsec3, nsec3param)) {
+ continue;
+ }
+
+ result = dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, name,
+ rdataset.ttl, &rdata, &tuple);
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+ result = do_one_tuple(&tuple, db, version, diff);
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+ }
+ if (result != ISC_R_NOMORE) {
+ goto failure;
+ }
+ result = ISC_R_SUCCESS;
+
+failure:
+ dns_rdataset_disassociate(&rdataset);
+cleanup_node:
+ dns_db_detachnode(db, &node);
+
+ return (result);
+}
+
+static bool
+better_param(dns_rdataset_t *nsec3paramset, dns_rdata_t *param) {
+ dns_rdataset_t rdataset;
+ isc_result_t result;
+
+ if (REMOVE(param->data[1])) {
+ return (true);
+ }
+
+ dns_rdataset_init(&rdataset);
+ dns_rdataset_clone(nsec3paramset, &rdataset);
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
+
+ if (rdataset.type != dns_rdatatype_nsec3param) {
+ dns_rdata_t tmprdata = DNS_RDATA_INIT;
+ dns_rdataset_current(&rdataset, &tmprdata);
+ if (!dns_nsec3param_fromprivate(&tmprdata, &rdata, buf,
+ sizeof(buf)))
+ {
+ continue;
+ }
+ } else {
+ dns_rdataset_current(&rdataset, &rdata);
+ }
+
+ if (rdata.length != param->length) {
+ continue;
+ }
+ if (rdata.data[0] != param->data[0] || REMOVE(rdata.data[1]) ||
+ rdata.data[2] != param->data[2] ||
+ rdata.data[3] != param->data[3] ||
+ rdata.data[4] != param->data[4] ||
+ memcmp(&rdata.data[5], &param->data[5], param->data[4]))
+ {
+ continue;
+ }
+ if (CREATE(rdata.data[1]) && !CREATE(param->data[1])) {
+ dns_rdataset_disassociate(&rdataset);
+ return (true);
+ }
+ }
+ dns_rdataset_disassociate(&rdataset);
+ return (false);
+}
+
+static isc_result_t
+find_nsec3(dns_rdata_nsec3_t *nsec3, dns_rdataset_t *rdataset,
+ const dns_rdata_nsec3param_t *nsec3param) {
+ isc_result_t result;
+ for (result = dns_rdataset_first(rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(rdataset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(rdataset, &rdata);
+ CHECK(dns_rdata_tostruct(&rdata, nsec3, NULL));
+ dns_rdata_reset(&rdata);
+ if (match_nsec3param(nsec3, nsec3param)) {
+ break;
+ }
+ }
+failure:
+ return (result);
+}
+
+isc_result_t
+dns_nsec3_addnsec3(dns_db_t *db, dns_dbversion_t *version,
+ const dns_name_t *name,
+ const dns_rdata_nsec3param_t *nsec3param, dns_ttl_t nsecttl,
+ bool unsecure, dns_diff_t *diff) {
+ dns_dbiterator_t *dbit = NULL;
+ dns_dbnode_t *node = NULL;
+ dns_dbnode_t *newnode = NULL;
+ dns_difftuple_t *tuple = NULL;
+ dns_fixedname_t fixed;
+ dns_fixedname_t fprev;
+ dns_hash_t hash;
+ dns_name_t *hashname;
+ dns_name_t *origin;
+ dns_name_t *prev;
+ dns_name_t empty;
+ dns_rdata_nsec3_t nsec3;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdataset_t rdataset;
+ int pass;
+ bool exists = false;
+ bool maybe_remove_unsecure = false;
+ uint8_t flags;
+ isc_buffer_t buffer;
+ isc_result_t result;
+ unsigned char *old_next;
+ unsigned char *salt;
+ unsigned char nexthash[NSEC3_MAX_HASH_LENGTH];
+ unsigned char nsec3buf[DNS_NSEC3_BUFFERSIZE];
+ unsigned int iterations;
+ unsigned int labels;
+ size_t next_length;
+ unsigned int old_length;
+ unsigned int salt_length;
+
+ hashname = dns_fixedname_initname(&fixed);
+ prev = dns_fixedname_initname(&fprev);
+
+ dns_rdataset_init(&rdataset);
+
+ origin = dns_db_origin(db);
+
+ /*
+ * Chain parameters.
+ */
+ hash = nsec3param->hash;
+ iterations = nsec3param->iterations;
+ salt_length = nsec3param->salt_length;
+ salt = nsec3param->salt;
+
+ /*
+ * Default flags for a new chain.
+ */
+ flags = nsec3param->flags & DNS_NSEC3FLAG_OPTOUT;
+
+ /*
+ * If this is the first NSEC3 in the chain nexthash will
+ * remain pointing to itself.
+ */
+ next_length = sizeof(nexthash);
+ CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length, name, origin,
+ hash, iterations, salt, salt_length));
+ INSIST(next_length <= sizeof(nexthash));
+
+ /*
+ * Create the node if it doesn't exist and hold
+ * a reference to it until we have added the NSEC3.
+ */
+ CHECK(dns_db_findnsec3node(db, hashname, true, &newnode));
+
+ /*
+ * Seek the iterator to the 'newnode'.
+ */
+ CHECK(dns_db_createiterator(db, DNS_DB_NSEC3ONLY, &dbit));
+ CHECK(dns_dbiterator_seek(dbit, hashname));
+ CHECK(dns_dbiterator_pause(dbit));
+ result = dns_db_findrdataset(db, newnode, version, dns_rdatatype_nsec3,
+ 0, (isc_stdtime_t)0, &rdataset, NULL);
+ /*
+ * If we updating a existing NSEC3 then find its
+ * next field.
+ */
+ if (result == ISC_R_SUCCESS) {
+ result = find_nsec3(&nsec3, &rdataset, nsec3param);
+ if (result == ISC_R_SUCCESS) {
+ if (!CREATE(nsec3param->flags)) {
+ flags = nsec3.flags;
+ }
+ next_length = nsec3.next_length;
+ INSIST(next_length <= sizeof(nexthash));
+ memmove(nexthash, nsec3.next, next_length);
+ dns_rdataset_disassociate(&rdataset);
+ /*
+ * If the NSEC3 is not for a unsecure delegation then
+ * we are just updating it. If it is for a unsecure
+ * delegation then we need find out if we need to
+ * remove the NSEC3 record or not by examining the
+ * previous NSEC3 record.
+ */
+ if (!unsecure) {
+ goto addnsec3;
+ } else if (CREATE(nsec3param->flags) && OPTOUT(flags)) {
+ result = dns_nsec3_delnsec3(db, version, name,
+ nsec3param, diff);
+ goto failure;
+ } else {
+ maybe_remove_unsecure = true;
+ }
+ } else {
+ dns_rdataset_disassociate(&rdataset);
+ if (result != ISC_R_NOMORE) {
+ goto failure;
+ }
+ }
+ }
+
+ /*
+ * Find the previous NSEC3 (if any) and update it if required.
+ */
+ pass = 0;
+ do {
+ result = dns_dbiterator_prev(dbit);
+ if (result == ISC_R_NOMORE) {
+ pass++;
+ CHECK(dns_dbiterator_last(dbit));
+ }
+ CHECK(dns_dbiterator_current(dbit, &node, prev));
+ CHECK(dns_dbiterator_pause(dbit));
+ result = dns_db_findrdataset(db, node, version,
+ dns_rdatatype_nsec3, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ dns_db_detachnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ continue;
+ }
+
+ result = find_nsec3(&nsec3, &rdataset, nsec3param);
+ if (result == ISC_R_NOMORE) {
+ dns_rdataset_disassociate(&rdataset);
+ continue;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ if (maybe_remove_unsecure) {
+ dns_rdataset_disassociate(&rdataset);
+ /*
+ * If we have OPTOUT set in the previous NSEC3 record
+ * we actually need to delete the NSEC3 record.
+ * Otherwise we just need to replace the NSEC3 record.
+ */
+ if (OPTOUT(nsec3.flags)) {
+ result = dns_nsec3_delnsec3(db, version, name,
+ nsec3param, diff);
+ goto failure;
+ }
+ goto addnsec3;
+ } else {
+ /*
+ * Is this is a unsecure delegation we are adding?
+ * If so no change is required.
+ */
+ if (OPTOUT(nsec3.flags) && unsecure) {
+ dns_rdataset_disassociate(&rdataset);
+ goto failure;
+ }
+ }
+
+ old_next = nsec3.next;
+ old_length = nsec3.next_length;
+
+ /*
+ * Delete the old previous NSEC3.
+ */
+ CHECK(delnsec3(db, version, prev, nsec3param, diff));
+
+ /*
+ * Fixup the previous NSEC3.
+ */
+ nsec3.next = nexthash;
+ nsec3.next_length = (unsigned char)next_length;
+ isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf));
+ CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass,
+ dns_rdatatype_nsec3, &nsec3,
+ &buffer));
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, prev,
+ rdataset.ttl, &rdata, &tuple));
+ CHECK(do_one_tuple(&tuple, db, version, diff));
+ INSIST(old_length <= sizeof(nexthash));
+ memmove(nexthash, old_next, old_length);
+ if (!CREATE(nsec3param->flags)) {
+ flags = nsec3.flags;
+ }
+ dns_rdata_reset(&rdata);
+ dns_rdataset_disassociate(&rdataset);
+ break;
+ } while (pass < 2);
+
+addnsec3:
+ /*
+ * Create the NSEC3 RDATA.
+ */
+ CHECK(dns_db_findnode(db, name, false, &node));
+ CHECK(dns_nsec3_buildrdata(db, version, node, hash, flags, iterations,
+ salt, salt_length, nexthash, next_length,
+ nsec3buf, &rdata));
+ dns_db_detachnode(db, &node);
+
+ /*
+ * Delete the old NSEC3 and record the change.
+ */
+ CHECK(delnsec3(db, version, hashname, nsec3param, diff));
+ /*
+ * Add the new NSEC3 and record the change.
+ */
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, hashname,
+ nsecttl, &rdata, &tuple));
+ CHECK(do_one_tuple(&tuple, db, version, diff));
+ INSIST(tuple == NULL);
+ dns_rdata_reset(&rdata);
+ dns_db_detachnode(db, &newnode);
+
+ /*
+ * Add missing NSEC3 records for empty nodes
+ */
+ dns_name_init(&empty, NULL);
+ dns_name_clone(name, &empty);
+ do {
+ labels = dns_name_countlabels(&empty) - 1;
+ if (labels <= dns_name_countlabels(origin)) {
+ break;
+ }
+ dns_name_getlabelsequence(&empty, 1, labels, &empty);
+ CHECK(name_exists(db, version, &empty, &exists));
+ if (exists) {
+ break;
+ }
+ CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length, &empty,
+ origin, hash, iterations, salt,
+ salt_length));
+
+ /*
+ * Create the node if it doesn't exist and hold
+ * a reference to it until we have added the NSEC3
+ * or we discover we don't need to add make a change.
+ */
+ CHECK(dns_db_findnsec3node(db, hashname, true, &newnode));
+ result = dns_db_findrdataset(db, newnode, version,
+ dns_rdatatype_nsec3, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ if (result == ISC_R_SUCCESS) {
+ result = find_nsec3(&nsec3, &rdataset, nsec3param);
+ dns_rdataset_disassociate(&rdataset);
+ if (result == ISC_R_SUCCESS) {
+ dns_db_detachnode(db, &newnode);
+ break;
+ }
+ if (result != ISC_R_NOMORE) {
+ goto failure;
+ }
+ }
+
+ /*
+ * Find the previous NSEC3 and update it.
+ */
+ CHECK(dns_dbiterator_seek(dbit, hashname));
+ pass = 0;
+ do {
+ result = dns_dbiterator_prev(dbit);
+ if (result == ISC_R_NOMORE) {
+ pass++;
+ CHECK(dns_dbiterator_last(dbit));
+ }
+ CHECK(dns_dbiterator_current(dbit, &node, prev));
+ CHECK(dns_dbiterator_pause(dbit));
+ result = dns_db_findrdataset(
+ db, node, version, dns_rdatatype_nsec3, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ dns_db_detachnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ continue;
+ }
+ result = find_nsec3(&nsec3, &rdataset, nsec3param);
+ if (result == ISC_R_NOMORE) {
+ dns_rdataset_disassociate(&rdataset);
+ continue;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ old_next = nsec3.next;
+ old_length = nsec3.next_length;
+
+ /*
+ * Delete the old previous NSEC3.
+ */
+ CHECK(delnsec3(db, version, prev, nsec3param, diff));
+
+ /*
+ * Fixup the previous NSEC3.
+ */
+ nsec3.next = nexthash;
+ nsec3.next_length = (unsigned char)next_length;
+ isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf));
+ CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass,
+ dns_rdatatype_nsec3, &nsec3,
+ &buffer));
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
+ prev, rdataset.ttl, &rdata,
+ &tuple));
+ CHECK(do_one_tuple(&tuple, db, version, diff));
+ INSIST(old_length <= sizeof(nexthash));
+ memmove(nexthash, old_next, old_length);
+ if (!CREATE(nsec3param->flags)) {
+ flags = nsec3.flags;
+ }
+ dns_rdata_reset(&rdata);
+ dns_rdataset_disassociate(&rdataset);
+ break;
+ } while (pass < 2);
+
+ INSIST(pass < 2);
+
+ /*
+ * Create the NSEC3 RDATA for the empty node.
+ */
+ CHECK(dns_nsec3_buildrdata(
+ db, version, NULL, hash, flags, iterations, salt,
+ salt_length, nexthash, next_length, nsec3buf, &rdata));
+ /*
+ * Delete the old NSEC3 and record the change.
+ */
+ CHECK(delnsec3(db, version, hashname, nsec3param, diff));
+
+ /*
+ * Add the new NSEC3 and record the change.
+ */
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, hashname,
+ nsecttl, &rdata, &tuple));
+ CHECK(do_one_tuple(&tuple, db, version, diff));
+ INSIST(tuple == NULL);
+ dns_rdata_reset(&rdata);
+ dns_db_detachnode(db, &newnode);
+ } while (1);
+
+ /* result cannot be ISC_R_NOMORE here */
+ INSIST(result != ISC_R_NOMORE);
+
+failure:
+ if (dbit != NULL) {
+ dns_dbiterator_destroy(&dbit);
+ }
+ if (dns_rdataset_isassociated(&rdataset)) {
+ dns_rdataset_disassociate(&rdataset);
+ }
+ if (node != NULL) {
+ dns_db_detachnode(db, &node);
+ }
+ if (newnode != NULL) {
+ dns_db_detachnode(db, &newnode);
+ }
+ return (result);
+}
+
+/*%
+ * Add NSEC3 records for "name", recording the change in "diff".
+ * The existing NSEC3 records are removed.
+ */
+isc_result_t
+dns_nsec3_addnsec3s(dns_db_t *db, dns_dbversion_t *version,
+ const dns_name_t *name, dns_ttl_t nsecttl, bool unsecure,
+ dns_diff_t *diff) {
+ dns_dbnode_t *node = NULL;
+ dns_rdata_nsec3param_t nsec3param;
+ dns_rdataset_t rdataset;
+ isc_result_t result;
+
+ dns_rdataset_init(&rdataset);
+
+ /*
+ * Find the NSEC3 parameters for this zone.
+ */
+ result = dns_db_getoriginnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ result = dns_db_findrdataset(db, node, version,
+ dns_rdatatype_nsec3param, 0, 0, &rdataset,
+ NULL);
+ dns_db_detachnode(db, &node);
+ if (result == ISC_R_NOTFOUND) {
+ return (ISC_R_SUCCESS);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ /*
+ * Update each active NSEC3 chain.
+ */
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(&rdataset, &rdata);
+ CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL));
+
+ if (nsec3param.flags != 0) {
+ continue;
+ }
+ /*
+ * We have a active chain. Update it.
+ */
+ CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param,
+ nsecttl, unsecure, diff));
+ }
+ if (result == ISC_R_NOMORE) {
+ result = ISC_R_SUCCESS;
+ }
+
+failure:
+ if (dns_rdataset_isassociated(&rdataset)) {
+ dns_rdataset_disassociate(&rdataset);
+ }
+ if (node != NULL) {
+ dns_db_detachnode(db, &node);
+ }
+
+ return (result);
+}
+
+bool
+dns_nsec3param_fromprivate(dns_rdata_t *src, dns_rdata_t *target,
+ unsigned char *buf, size_t buflen) {
+ dns_decompress_t dctx;
+ isc_result_t result;
+ isc_buffer_t buf1;
+ isc_buffer_t buf2;
+
+ /*
+ * Algorithm 0 (reserved by RFC 4034) is used to identify
+ * NSEC3PARAM records from DNSKEY pointers.
+ */
+ if (src->length < 1 || src->data[0] != 0) {
+ return (false);
+ }
+
+ isc_buffer_init(&buf1, src->data + 1, src->length - 1);
+ isc_buffer_add(&buf1, src->length - 1);
+ isc_buffer_setactive(&buf1, src->length - 1);
+ isc_buffer_init(&buf2, buf, (unsigned int)buflen);
+ dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_NONE);
+ result = dns_rdata_fromwire(target, src->rdclass,
+ dns_rdatatype_nsec3param, &buf1, &dctx, 0,
+ &buf2);
+ dns_decompress_invalidate(&dctx);
+
+ return (result == ISC_R_SUCCESS);
+}
+
+void
+dns_nsec3param_toprivate(dns_rdata_t *src, dns_rdata_t *target,
+ dns_rdatatype_t privatetype, unsigned char *buf,
+ size_t buflen) {
+ REQUIRE(buflen >= src->length + 1);
+
+ REQUIRE(DNS_RDATA_INITIALIZED(target));
+
+ memmove(buf + 1, src->data, src->length);
+ buf[0] = 0;
+ target->data = buf;
+ target->length = src->length + 1;
+ target->type = privatetype;
+ target->rdclass = src->rdclass;
+ target->flags = 0;
+ ISC_LINK_INIT(target, link);
+}
+
+static isc_result_t
+rr_exists(dns_db_t *db, dns_dbversion_t *ver, const dns_name_t *name,
+ const dns_rdata_t *rdata, bool *flag) {
+ dns_rdataset_t rdataset;
+ dns_dbnode_t *node = NULL;
+ isc_result_t result;
+
+ dns_rdataset_init(&rdataset);
+ if (rdata->type == dns_rdatatype_nsec3) {
+ CHECK(dns_db_findnsec3node(db, name, false, &node));
+ } else {
+ CHECK(dns_db_findnode(db, name, false, &node));
+ }
+ result = dns_db_findrdataset(db, node, ver, rdata->type, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ if (result == ISC_R_NOTFOUND) {
+ *flag = false;
+ result = ISC_R_SUCCESS;
+ goto failure;
+ }
+
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t myrdata = DNS_RDATA_INIT;
+ dns_rdataset_current(&rdataset, &myrdata);
+ if (!dns_rdata_casecompare(&myrdata, rdata)) {
+ break;
+ }
+ }
+ dns_rdataset_disassociate(&rdataset);
+ if (result == ISC_R_SUCCESS) {
+ *flag = true;
+ } else if (result == ISC_R_NOMORE) {
+ *flag = false;
+ result = ISC_R_SUCCESS;
+ }
+
+failure:
+ if (node != NULL) {
+ dns_db_detachnode(db, &node);
+ }
+ return (result);
+}
+
+isc_result_t
+dns_nsec3param_salttotext(dns_rdata_nsec3param_t *nsec3param, char *dst,
+ size_t dstlen) {
+ isc_result_t result;
+ isc_region_t r;
+ isc_buffer_t b;
+
+ REQUIRE(nsec3param != NULL);
+ REQUIRE(dst != NULL);
+
+ if (nsec3param->salt_length == 0) {
+ if (dstlen < 2U) {
+ return (ISC_R_NOSPACE);
+ }
+ strlcpy(dst, "-", dstlen);
+ return (ISC_R_SUCCESS);
+ }
+
+ r.base = nsec3param->salt;
+ r.length = nsec3param->salt_length;
+ isc_buffer_init(&b, dst, (unsigned int)dstlen);
+
+ result = isc_hex_totext(&r, 2, "", &b);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ if (isc_buffer_availablelength(&b) < 1) {
+ return (ISC_R_NOSPACE);
+ }
+ isc_buffer_putuint8(&b, 0);
+
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_nsec3param_deletechains(dns_db_t *db, dns_dbversion_t *ver,
+ dns_zone_t *zone, bool nonsec, dns_diff_t *diff) {
+ dns_dbnode_t *node = NULL;
+ dns_difftuple_t *tuple = NULL;
+ dns_name_t next;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdataset_t rdataset;
+ bool flag;
+ isc_result_t result = ISC_R_SUCCESS;
+ unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE + 1];
+ dns_name_t *origin = dns_zone_getorigin(zone);
+ dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);
+
+ dns_name_init(&next, NULL);
+ dns_rdataset_init(&rdataset);
+
+ result = dns_db_getoriginnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ /*
+ * Cause all NSEC3 chains to be deleted.
+ */
+ result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec3param, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ if (result == ISC_R_NOTFOUND) {
+ goto try_private;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t private = DNS_RDATA_INIT;
+
+ dns_rdataset_current(&rdataset, &rdata);
+
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, origin,
+ rdataset.ttl, &rdata, &tuple));
+ CHECK(do_one_tuple(&tuple, db, ver, diff));
+ INSIST(tuple == NULL);
+
+ dns_nsec3param_toprivate(&rdata, &private, privatetype, buf,
+ sizeof(buf));
+ buf[2] = DNS_NSEC3FLAG_REMOVE;
+ if (nonsec) {
+ buf[2] |= DNS_NSEC3FLAG_NONSEC;
+ }
+
+ CHECK(rr_exists(db, ver, origin, &private, &flag));
+
+ if (!flag) {
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
+ origin, 0, &private,
+ &tuple));
+ CHECK(do_one_tuple(&tuple, db, ver, diff));
+ INSIST(tuple == NULL);
+ }
+ dns_rdata_reset(&rdata);
+ }
+ if (result != ISC_R_NOMORE) {
+ goto failure;
+ }
+
+ dns_rdataset_disassociate(&rdataset);
+
+try_private:
+ if (privatetype == 0) {
+ goto success;
+ }
+ result = dns_db_findrdataset(db, node, ver, privatetype, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ if (result == ISC_R_NOTFOUND) {
+ goto success;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_reset(&rdata);
+ dns_rdataset_current(&rdataset, &rdata);
+ INSIST(rdata.length <= sizeof(buf));
+ memmove(buf, rdata.data, rdata.length);
+
+ /*
+ * Private NSEC3 record length >= 6.
+ * <0(1), hash(1), flags(1), iterations(2), saltlen(1)>
+ */
+ if (rdata.length < 6 || buf[0] != 0 ||
+ (buf[2] & DNS_NSEC3FLAG_REMOVE) != 0 ||
+ (nonsec && (buf[2] & DNS_NSEC3FLAG_NONSEC) != 0))
+ {
+ continue;
+ }
+
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, origin,
+ 0, &rdata, &tuple));
+ CHECK(do_one_tuple(&tuple, db, ver, diff));
+ INSIST(tuple == NULL);
+
+ rdata.data = buf;
+ buf[2] = DNS_NSEC3FLAG_REMOVE;
+ if (nonsec) {
+ buf[2] |= DNS_NSEC3FLAG_NONSEC;
+ }
+
+ CHECK(rr_exists(db, ver, origin, &rdata, &flag));
+
+ if (!flag) {
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
+ origin, 0, &rdata, &tuple));
+ CHECK(do_one_tuple(&tuple, db, ver, diff));
+ INSIST(tuple == NULL);
+ }
+ }
+ if (result != ISC_R_NOMORE) {
+ goto failure;
+ }
+success:
+ result = ISC_R_SUCCESS;
+
+failure:
+ if (dns_rdataset_isassociated(&rdataset)) {
+ dns_rdataset_disassociate(&rdataset);
+ }
+ dns_db_detachnode(db, &node);
+ return (result);
+}
+
+isc_result_t
+dns_nsec3_addnsec3sx(dns_db_t *db, dns_dbversion_t *version,
+ const dns_name_t *name, dns_ttl_t nsecttl, bool unsecure,
+ dns_rdatatype_t type, dns_diff_t *diff) {
+ dns_dbnode_t *node = NULL;
+ dns_rdata_nsec3param_t nsec3param;
+ dns_rdataset_t rdataset;
+ dns_rdataset_t prdataset;
+ isc_result_t result;
+
+ dns_rdataset_init(&rdataset);
+ dns_rdataset_init(&prdataset);
+
+ /*
+ * Find the NSEC3 parameters for this zone.
+ */
+ result = dns_db_getoriginnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ result = dns_db_findrdataset(db, node, version, type, 0, 0, &prdataset,
+ NULL);
+ if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND) {
+ goto failure;
+ }
+
+ result = dns_db_findrdataset(db, node, version,
+ dns_rdatatype_nsec3param, 0, 0, &rdataset,
+ NULL);
+ if (result == ISC_R_NOTFOUND) {
+ goto try_private;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ /*
+ * Update each active NSEC3 chain.
+ */
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(&rdataset, &rdata);
+ CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL));
+
+ if (nsec3param.flags != 0) {
+ continue;
+ }
+
+ /*
+ * We have a active chain. Update it.
+ */
+ CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param,
+ nsecttl, unsecure, diff));
+ }
+ if (result != ISC_R_NOMORE) {
+ goto failure;
+ }
+
+ dns_rdataset_disassociate(&rdataset);
+
+try_private:
+ if (!dns_rdataset_isassociated(&prdataset)) {
+ goto success;
+ }
+ /*
+ * Update each active NSEC3 chain.
+ */
+ for (result = dns_rdataset_first(&prdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&prdataset))
+ {
+ dns_rdata_t rdata1 = DNS_RDATA_INIT;
+ dns_rdata_t rdata2 = DNS_RDATA_INIT;
+ unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
+
+ dns_rdataset_current(&prdataset, &rdata1);
+ if (!dns_nsec3param_fromprivate(&rdata1, &rdata2, buf,
+ sizeof(buf)))
+ {
+ continue;
+ }
+ CHECK(dns_rdata_tostruct(&rdata2, &nsec3param, NULL));
+
+ if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0) {
+ continue;
+ }
+ if (better_param(&prdataset, &rdata2)) {
+ continue;
+ }
+
+ /*
+ * We have a active chain. Update it.
+ */
+ CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param,
+ nsecttl, unsecure, diff));
+ }
+ if (result == ISC_R_NOMORE) {
+ success:
+ result = ISC_R_SUCCESS;
+ }
+failure:
+ if (dns_rdataset_isassociated(&rdataset)) {
+ dns_rdataset_disassociate(&rdataset);
+ }
+ if (dns_rdataset_isassociated(&prdataset)) {
+ dns_rdataset_disassociate(&prdataset);
+ }
+ if (node != NULL) {
+ dns_db_detachnode(db, &node);
+ }
+
+ return (result);
+}
+
+/*%
+ * Determine whether any NSEC3 records that were associated with
+ * 'name' should be deleted or if they should continue to exist.
+ * true indicates they should be deleted.
+ * false indicates they should be retained.
+ */
+static isc_result_t
+deleteit(dns_db_t *db, dns_dbversion_t *ver, const dns_name_t *name,
+ bool *yesno) {
+ isc_result_t result;
+ dns_fixedname_t foundname;
+ dns_fixedname_init(&foundname);
+
+ result = dns_db_find(db, name, ver, dns_rdatatype_any,
+ DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD,
+ (isc_stdtime_t)0, NULL,
+ dns_fixedname_name(&foundname), NULL, NULL);
+ if (result == DNS_R_EMPTYNAME || result == ISC_R_SUCCESS ||
+ result == DNS_R_ZONECUT)
+ {
+ *yesno = false;
+ return (ISC_R_SUCCESS);
+ }
+ if (result == DNS_R_GLUE || result == DNS_R_DNAME ||
+ result == DNS_R_DELEGATION || result == DNS_R_NXDOMAIN)
+ {
+ *yesno = true;
+ return (ISC_R_SUCCESS);
+ }
+ /*
+ * Silence compiler.
+ */
+ *yesno = true;
+ return (result);
+}
+
+isc_result_t
+dns_nsec3_delnsec3(dns_db_t *db, dns_dbversion_t *version,
+ const dns_name_t *name,
+ const dns_rdata_nsec3param_t *nsec3param, dns_diff_t *diff) {
+ dns_dbiterator_t *dbit = NULL;
+ dns_dbnode_t *node = NULL;
+ dns_difftuple_t *tuple = NULL;
+ dns_fixedname_t fixed;
+ dns_fixedname_t fprev;
+ dns_hash_t hash;
+ dns_name_t *hashname;
+ dns_name_t *origin;
+ dns_name_t *prev;
+ dns_name_t empty;
+ dns_rdata_nsec3_t nsec3;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdataset_t rdataset;
+ int pass;
+ bool yesno;
+ isc_buffer_t buffer;
+ isc_result_t result;
+ unsigned char *salt;
+ unsigned char nexthash[NSEC3_MAX_HASH_LENGTH];
+ unsigned char nsec3buf[DNS_NSEC3_BUFFERSIZE];
+ unsigned int iterations;
+ unsigned int labels;
+ size_t next_length;
+ unsigned int salt_length;
+
+ hashname = dns_fixedname_initname(&fixed);
+ prev = dns_fixedname_initname(&fprev);
+
+ dns_rdataset_init(&rdataset);
+
+ origin = dns_db_origin(db);
+
+ /*
+ * Chain parameters.
+ */
+ hash = nsec3param->hash;
+ iterations = nsec3param->iterations;
+ salt_length = nsec3param->salt_length;
+ salt = nsec3param->salt;
+
+ /*
+ * If this is the first NSEC3 in the chain nexthash will
+ * remain pointing to itself.
+ */
+ next_length = sizeof(nexthash);
+ CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length, name, origin,
+ hash, iterations, salt, salt_length));
+
+ CHECK(dns_db_createiterator(db, DNS_DB_NSEC3ONLY, &dbit));
+
+ result = dns_dbiterator_seek(dbit, hashname);
+ if (result == ISC_R_NOTFOUND || result == DNS_R_PARTIALMATCH) {
+ goto cleanup_orphaned_ents;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ CHECK(dns_dbiterator_current(dbit, &node, NULL));
+ CHECK(dns_dbiterator_pause(dbit));
+ result = dns_db_findrdataset(db, node, version, dns_rdatatype_nsec3, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ dns_db_detachnode(db, &node);
+ if (result == ISC_R_NOTFOUND) {
+ goto cleanup_orphaned_ents;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ /*
+ * If we find a existing NSEC3 for this chain then save the
+ * next field.
+ */
+ result = find_nsec3(&nsec3, &rdataset, nsec3param);
+ if (result == ISC_R_SUCCESS) {
+ next_length = nsec3.next_length;
+ INSIST(next_length <= sizeof(nexthash));
+ memmove(nexthash, nsec3.next, next_length);
+ }
+ dns_rdataset_disassociate(&rdataset);
+ if (result == ISC_R_NOMORE) {
+ goto success;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ /*
+ * Find the previous NSEC3 and update it.
+ */
+ pass = 0;
+ do {
+ result = dns_dbiterator_prev(dbit);
+ if (result == ISC_R_NOMORE) {
+ pass++;
+ CHECK(dns_dbiterator_last(dbit));
+ }
+ CHECK(dns_dbiterator_current(dbit, &node, prev));
+ CHECK(dns_dbiterator_pause(dbit));
+ result = dns_db_findrdataset(db, node, version,
+ dns_rdatatype_nsec3, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ dns_db_detachnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ continue;
+ }
+ result = find_nsec3(&nsec3, &rdataset, nsec3param);
+ if (result == ISC_R_NOMORE) {
+ dns_rdataset_disassociate(&rdataset);
+ continue;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ /*
+ * Delete the old previous NSEC3.
+ */
+ CHECK(delnsec3(db, version, prev, nsec3param, diff));
+
+ /*
+ * Fixup the previous NSEC3.
+ */
+ nsec3.next = nexthash;
+ nsec3.next_length = (unsigned char)next_length;
+ if (CREATE(nsec3param->flags)) {
+ nsec3.flags = nsec3param->flags & DNS_NSEC3FLAG_OPTOUT;
+ }
+ isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf));
+ CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass,
+ dns_rdatatype_nsec3, &nsec3,
+ &buffer));
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, prev,
+ rdataset.ttl, &rdata, &tuple));
+ CHECK(do_one_tuple(&tuple, db, version, diff));
+ dns_rdata_reset(&rdata);
+ dns_rdataset_disassociate(&rdataset);
+ break;
+ } while (pass < 2);
+
+ /*
+ * Delete the old NSEC3 and record the change.
+ */
+ CHECK(delnsec3(db, version, hashname, nsec3param, diff));
+
+ /*
+ * Delete NSEC3 records for now non active nodes.
+ */
+cleanup_orphaned_ents:
+ dns_name_init(&empty, NULL);
+ dns_name_clone(name, &empty);
+ do {
+ labels = dns_name_countlabels(&empty) - 1;
+ if (labels <= dns_name_countlabels(origin)) {
+ break;
+ }
+ dns_name_getlabelsequence(&empty, 1, labels, &empty);
+ CHECK(deleteit(db, version, &empty, &yesno));
+ if (!yesno) {
+ break;
+ }
+
+ CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length, &empty,
+ origin, hash, iterations, salt,
+ salt_length));
+ result = dns_dbiterator_seek(dbit, hashname);
+ if (result == ISC_R_NOTFOUND || result == DNS_R_PARTIALMATCH) {
+ goto success;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ CHECK(dns_dbiterator_current(dbit, &node, NULL));
+ CHECK(dns_dbiterator_pause(dbit));
+ result = dns_db_findrdataset(db, node, version,
+ dns_rdatatype_nsec3, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ dns_db_detachnode(db, &node);
+ if (result == ISC_R_NOTFOUND) {
+ goto success;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ result = find_nsec3(&nsec3, &rdataset, nsec3param);
+ if (result == ISC_R_SUCCESS) {
+ next_length = nsec3.next_length;
+ INSIST(next_length <= sizeof(nexthash));
+ memmove(nexthash, nsec3.next, next_length);
+ }
+ dns_rdataset_disassociate(&rdataset);
+ if (result == ISC_R_NOMORE) {
+ goto success;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ pass = 0;
+ do {
+ result = dns_dbiterator_prev(dbit);
+ if (result == ISC_R_NOMORE) {
+ pass++;
+ CHECK(dns_dbiterator_last(dbit));
+ }
+ CHECK(dns_dbiterator_current(dbit, &node, prev));
+ CHECK(dns_dbiterator_pause(dbit));
+ result = dns_db_findrdataset(
+ db, node, version, dns_rdatatype_nsec3, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ dns_db_detachnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ continue;
+ }
+ result = find_nsec3(&nsec3, &rdataset, nsec3param);
+ if (result == ISC_R_NOMORE) {
+ dns_rdataset_disassociate(&rdataset);
+ continue;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ /*
+ * Delete the old previous NSEC3.
+ */
+ CHECK(delnsec3(db, version, prev, nsec3param, diff));
+
+ /*
+ * Fixup the previous NSEC3.
+ */
+ nsec3.next = nexthash;
+ nsec3.next_length = (unsigned char)next_length;
+ isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf));
+ CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass,
+ dns_rdatatype_nsec3, &nsec3,
+ &buffer));
+ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
+ prev, rdataset.ttl, &rdata,
+ &tuple));
+ CHECK(do_one_tuple(&tuple, db, version, diff));
+ dns_rdata_reset(&rdata);
+ dns_rdataset_disassociate(&rdataset);
+ break;
+ } while (pass < 2);
+
+ INSIST(pass < 2);
+
+ /*
+ * Delete the old NSEC3 and record the change.
+ */
+ CHECK(delnsec3(db, version, hashname, nsec3param, diff));
+ } while (1);
+
+success:
+ result = ISC_R_SUCCESS;
+
+failure:
+ if (dbit != NULL) {
+ dns_dbiterator_destroy(&dbit);
+ }
+ if (dns_rdataset_isassociated(&rdataset)) {
+ dns_rdataset_disassociate(&rdataset);
+ }
+ if (node != NULL) {
+ dns_db_detachnode(db, &node);
+ }
+ return (result);
+}
+
+isc_result_t
+dns_nsec3_delnsec3s(dns_db_t *db, dns_dbversion_t *version,
+ const dns_name_t *name, dns_diff_t *diff) {
+ return (dns_nsec3_delnsec3sx(db, version, name, 0, diff));
+}
+
+isc_result_t
+dns_nsec3_delnsec3sx(dns_db_t *db, dns_dbversion_t *version,
+ const dns_name_t *name, dns_rdatatype_t privatetype,
+ dns_diff_t *diff) {
+ dns_dbnode_t *node = NULL;
+ dns_rdata_nsec3param_t nsec3param;
+ dns_rdataset_t rdataset;
+ isc_result_t result;
+
+ dns_rdataset_init(&rdataset);
+
+ /*
+ * Find the NSEC3 parameters for this zone.
+ */
+ result = dns_db_getoriginnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ result = dns_db_findrdataset(db, node, version,
+ dns_rdatatype_nsec3param, 0, 0, &rdataset,
+ NULL);
+ if (result == ISC_R_NOTFOUND) {
+ goto try_private;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ /*
+ * Update each active NSEC3 chain.
+ */
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(&rdataset, &rdata);
+ CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL));
+
+ if (nsec3param.flags != 0) {
+ continue;
+ }
+ /*
+ * We have a active chain. Update it.
+ */
+ CHECK(dns_nsec3_delnsec3(db, version, name, &nsec3param, diff));
+ }
+ dns_rdataset_disassociate(&rdataset);
+
+try_private:
+ if (privatetype == 0) {
+ goto success;
+ }
+ result = dns_db_findrdataset(db, node, version, privatetype, 0, 0,
+ &rdataset, NULL);
+ if (result == ISC_R_NOTFOUND) {
+ goto success;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ /*
+ * Update each NSEC3 chain being built.
+ */
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t rdata1 = DNS_RDATA_INIT;
+ dns_rdata_t rdata2 = DNS_RDATA_INIT;
+ unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
+
+ dns_rdataset_current(&rdataset, &rdata1);
+ if (!dns_nsec3param_fromprivate(&rdata1, &rdata2, buf,
+ sizeof(buf)))
+ {
+ continue;
+ }
+ CHECK(dns_rdata_tostruct(&rdata2, &nsec3param, NULL));
+
+ if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0) {
+ continue;
+ }
+ if (better_param(&rdataset, &rdata2)) {
+ continue;
+ }
+
+ /*
+ * We have a active chain. Update it.
+ */
+ CHECK(dns_nsec3_delnsec3(db, version, name, &nsec3param, diff));
+ }
+ if (result == ISC_R_NOMORE) {
+ success:
+ result = ISC_R_SUCCESS;
+ }
+
+failure:
+ if (dns_rdataset_isassociated(&rdataset)) {
+ dns_rdataset_disassociate(&rdataset);
+ }
+ if (node != NULL) {
+ dns_db_detachnode(db, &node);
+ }
+
+ return (result);
+}
+
+isc_result_t
+dns_nsec3_active(dns_db_t *db, dns_dbversion_t *version, bool complete,
+ bool *answer) {
+ return (dns_nsec3_activex(db, version, complete, 0, answer));
+}
+
+isc_result_t
+dns_nsec3_activex(dns_db_t *db, dns_dbversion_t *version, bool complete,
+ dns_rdatatype_t privatetype, bool *answer) {
+ dns_dbnode_t *node = NULL;
+ dns_rdataset_t rdataset;
+ dns_rdata_nsec3param_t nsec3param;
+ isc_result_t result;
+
+ REQUIRE(answer != NULL);
+
+ dns_rdataset_init(&rdataset);
+
+ result = dns_db_getoriginnode(db, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ result = dns_db_findrdataset(db, node, version,
+ dns_rdatatype_nsec3param, 0, 0, &rdataset,
+ NULL);
+
+ if (result == ISC_R_NOTFOUND) {
+ goto try_private;
+ }
+
+ if (result != ISC_R_SUCCESS) {
+ dns_db_detachnode(db, &node);
+ return (result);
+ }
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(&rdataset, &rdata);
+ result = dns_rdata_tostruct(&rdata, &nsec3param, NULL);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+ if (nsec3param.flags == 0) {
+ break;
+ }
+ }
+ dns_rdataset_disassociate(&rdataset);
+ if (result == ISC_R_SUCCESS) {
+ dns_db_detachnode(db, &node);
+ *answer = true;
+ return (ISC_R_SUCCESS);
+ }
+ if (result == ISC_R_NOMORE) {
+ *answer = false;
+ }
+
+try_private:
+ if (privatetype == 0 || complete) {
+ dns_db_detachnode(db, &node);
+ *answer = false;
+ return (ISC_R_SUCCESS);
+ }
+ result = dns_db_findrdataset(db, node, version, privatetype, 0, 0,
+ &rdataset, NULL);
+
+ dns_db_detachnode(db, &node);
+ if (result == ISC_R_NOTFOUND) {
+ *answer = false;
+ return (ISC_R_SUCCESS);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rdataset))
+ {
+ dns_rdata_t rdata1 = DNS_RDATA_INIT;
+ dns_rdata_t rdata2 = DNS_RDATA_INIT;
+ unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
+
+ dns_rdataset_current(&rdataset, &rdata1);
+ if (!dns_nsec3param_fromprivate(&rdata1, &rdata2, buf,
+ sizeof(buf)))
+ {
+ continue;
+ }
+ result = dns_rdata_tostruct(&rdata2, &nsec3param, NULL);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+ if (!complete && CREATE(nsec3param.flags)) {
+ break;
+ }
+ }
+ dns_rdataset_disassociate(&rdataset);
+ if (result == ISC_R_SUCCESS) {
+ *answer = true;
+ result = ISC_R_SUCCESS;
+ }
+ if (result == ISC_R_NOMORE) {
+ *answer = false;
+ result = ISC_R_SUCCESS;
+ }
+
+ return (result);
+}
+
+unsigned int
+dns_nsec3_maxiterations(void) {
+ return (DNS_NSEC3_MAXITERATIONS);
+}
+
+isc_result_t
+dns_nsec3_noexistnodata(dns_rdatatype_t type, const dns_name_t *name,
+ const dns_name_t *nsec3name, dns_rdataset_t *nsec3set,
+ dns_name_t *zonename, bool *exists, bool *data,
+ bool *optout, bool *unknown, bool *setclosest,
+ bool *setnearest, dns_name_t *closest,
+ dns_name_t *nearest, dns_nseclog_t logit, void *arg) {
+ char namebuf[DNS_NAME_FORMATSIZE];
+ dns_fixedname_t fzone;
+ dns_fixedname_t qfixed;
+ dns_label_t hashlabel;
+ dns_name_t *qname;
+ dns_name_t *zone;
+ dns_rdata_nsec3_t nsec3;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ int order;
+ int scope;
+ bool atparent;
+ bool first;
+ bool ns;
+ bool soa;
+ isc_buffer_t buffer;
+ isc_result_t answer = ISC_R_IGNORE;
+ isc_result_t result;
+ unsigned char hash[NSEC3_MAX_HASH_LENGTH];
+ unsigned char owner[NSEC3_MAX_HASH_LENGTH];
+ unsigned int length;
+ unsigned int qlabels;
+ unsigned int zlabels;
+
+ REQUIRE((exists == NULL && data == NULL) ||
+ (exists != NULL && data != NULL));
+ REQUIRE(nsec3set != NULL && nsec3set->type == dns_rdatatype_nsec3);
+ REQUIRE((setclosest == NULL && closest == NULL) ||
+ (setclosest != NULL && closest != NULL));
+ REQUIRE((setnearest == NULL && nearest == NULL) ||
+ (setnearest != NULL && nearest != NULL));
+
+ result = dns_rdataset_first(nsec3set);
+ if (result != ISC_R_SUCCESS) {
+ (*logit)(arg, ISC_LOG_DEBUG(3), "failure processing NSEC3 set");
+ return (result);
+ }
+
+ dns_rdataset_current(nsec3set, &rdata);
+
+ result = dns_rdata_tostruct(&rdata, &nsec3, NULL);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ (*logit)(arg, ISC_LOG_DEBUG(3), "looking for relevant NSEC3");
+
+ zone = dns_fixedname_initname(&fzone);
+ zlabels = dns_name_countlabels(nsec3name);
+
+ /*
+ * NSEC3 records must have two or more labels to be valid.
+ */
+ if (zlabels < 2) {
+ return (ISC_R_IGNORE);
+ }
+
+ /*
+ * Strip off the NSEC3 hash to get the zone.
+ */
+ zlabels--;
+ dns_name_split(nsec3name, zlabels, NULL, zone);
+
+ /*
+ * If not below the zone name we can ignore this record.
+ */
+ if (!dns_name_issubdomain(name, zone)) {
+ return (ISC_R_IGNORE);
+ }
+
+ /*
+ * Is this zone the same or deeper than the current zone?
+ */
+ if (dns_name_countlabels(zonename) == 0 ||
+ dns_name_issubdomain(zone, zonename))
+ {
+ dns_name_copy(zone, zonename);
+ }
+
+ if (!dns_name_equal(zone, zonename)) {
+ return (ISC_R_IGNORE);
+ }
+
+ /*
+ * Are we only looking for the most enclosing zone?
+ */
+ if (exists == NULL || data == NULL) {
+ return (ISC_R_SUCCESS);
+ }
+
+ /*
+ * Only set unknown once we are sure that this NSEC3 is from
+ * the deepest covering zone.
+ */
+ if (!dns_nsec3_supportedhash(nsec3.hash)) {
+ if (unknown != NULL) {
+ *unknown = true;
+ }
+ return (ISC_R_IGNORE);
+ }
+
+ /*
+ * Recover the hash from the first label.
+ */
+ dns_name_getlabel(nsec3name, 0, &hashlabel);
+ isc_region_consume(&hashlabel, 1);
+ isc_buffer_init(&buffer, owner, sizeof(owner));
+ result = isc_base32hex_decoderegion(&hashlabel, &buffer);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ /*
+ * The hash lengths should match. If not ignore the record.
+ */
+ if (isc_buffer_usedlength(&buffer) != nsec3.next_length) {
+ return (ISC_R_IGNORE);
+ }
+
+ /*
+ * Work out what this NSEC3 covers.
+ * Inside (<0) or outside (>=0).
+ */
+ scope = memcmp(owner, nsec3.next, nsec3.next_length);
+
+ /*
+ * Prepare to compute all the hashes.
+ */
+ qname = dns_fixedname_initname(&qfixed);
+ dns_name_downcase(name, qname, NULL);
+ qlabels = dns_name_countlabels(qname);
+ first = true;
+
+ while (qlabels >= zlabels) {
+ /*
+ * If there are too many iterations reject the NSEC3 record.
+ */
+ if (nsec3.iterations > DNS_NSEC3_MAXITERATIONS) {
+ return (DNS_R_NSEC3ITERRANGE);
+ }
+
+ length = isc_iterated_hash(hash, nsec3.hash, nsec3.iterations,
+ nsec3.salt, nsec3.salt_length,
+ qname->ndata, qname->length);
+ /*
+ * The computed hash length should match.
+ */
+ if (length != nsec3.next_length) {
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "ignoring NSEC bad length %u vs %u", length,
+ nsec3.next_length);
+ return (ISC_R_IGNORE);
+ }
+
+ order = memcmp(hash, owner, length);
+ if (first && order == 0) {
+ /*
+ * The hashes are the same.
+ */
+ atparent = dns_rdatatype_atparent(type);
+ ns = dns_nsec3_typepresent(&rdata, dns_rdatatype_ns);
+ soa = dns_nsec3_typepresent(&rdata, dns_rdatatype_soa);
+ if (ns && !soa) {
+ if (!atparent) {
+ /*
+ * This NSEC3 record is from somewhere
+ * higher in the DNS, and at the
+ * parent of a delegation. It can not
+ * be legitimately used here.
+ */
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "ignoring parent NSEC3");
+ return (ISC_R_IGNORE);
+ }
+ } else if (atparent && ns && soa) {
+ /*
+ * This NSEC3 record is from the child.
+ * It can not be legitimately used here.
+ */
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "ignoring child NSEC3");
+ return (ISC_R_IGNORE);
+ }
+ if (type == dns_rdatatype_cname ||
+ type == dns_rdatatype_nxt ||
+ type == dns_rdatatype_nsec ||
+ type == dns_rdatatype_key ||
+ !dns_nsec3_typepresent(&rdata, dns_rdatatype_cname))
+ {
+ *exists = true;
+ *data = dns_nsec3_typepresent(&rdata, type);
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "NSEC3 proves name exists (owner) "
+ "data=%d",
+ *data);
+ return (ISC_R_SUCCESS);
+ }
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "NSEC3 proves CNAME exists");
+ return (ISC_R_IGNORE);
+ }
+
+ if (order == 0 &&
+ dns_nsec3_typepresent(&rdata, dns_rdatatype_ns) &&
+ !dns_nsec3_typepresent(&rdata, dns_rdatatype_soa))
+ {
+ /*
+ * This NSEC3 record is from somewhere higher in
+ * the DNS, and at the parent of a delegation.
+ * It can not be legitimately used here.
+ */
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "ignoring parent NSEC3");
+ return (ISC_R_IGNORE);
+ }
+
+ /*
+ * Potential closest encloser.
+ */
+ if (order == 0) {
+ if (closest != NULL &&
+ (dns_name_countlabels(closest) == 0 ||
+ dns_name_issubdomain(qname, closest)) &&
+ !dns_nsec3_typepresent(&rdata, dns_rdatatype_ds) &&
+ !dns_nsec3_typepresent(&rdata,
+ dns_rdatatype_dname) &&
+ (dns_nsec3_typepresent(&rdata, dns_rdatatype_soa) ||
+ !dns_nsec3_typepresent(&rdata, dns_rdatatype_ns)))
+ {
+ dns_name_format(qname, namebuf,
+ sizeof(namebuf));
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "NSEC3 indicates potential closest "
+ "encloser: '%s'",
+ namebuf);
+ dns_name_copy(qname, closest);
+ *setclosest = true;
+ }
+ dns_name_format(qname, namebuf, sizeof(namebuf));
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "NSEC3 at super-domain %s", namebuf);
+ return (answer);
+ }
+
+ /*
+ * Find if the name does not exist.
+ *
+ * We continue as we need to find the name closest to the
+ * closest encloser that doesn't exist.
+ *
+ * We also need to continue to ensure that we are not
+ * proving the non-existence of a record in a sub-zone.
+ * If that would be the case we will return ISC_R_IGNORE
+ * above.
+ */
+ if ((scope < 0 && order > 0 &&
+ memcmp(hash, nsec3.next, length) < 0) ||
+ (scope >= 0 &&
+ (order > 0 || memcmp(hash, nsec3.next, length) < 0)))
+ {
+ dns_name_format(qname, namebuf, sizeof(namebuf));
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ "NSEC3 proves "
+ "name does not exist: '%s'",
+ namebuf);
+ if (nearest != NULL &&
+ (dns_name_countlabels(nearest) == 0 ||
+ dns_name_issubdomain(nearest, qname)))
+ {
+ dns_name_copy(qname, nearest);
+ *setnearest = true;
+ }
+
+ *exists = false;
+ *data = false;
+ if (optout != NULL) {
+ *optout = ((nsec3.flags &
+ DNS_NSEC3FLAG_OPTOUT) != 0);
+ (*logit)(arg, ISC_LOG_DEBUG(3),
+ (*optout ? "NSEC3 indicates optout"
+ : "NSEC3 indicates secure "
+ "range"));
+ }
+ answer = ISC_R_SUCCESS;
+ }
+
+ qlabels--;
+ if (qlabels > 0) {
+ dns_name_split(qname, qlabels, NULL, qname);
+ }
+ first = false;
+ }
+ return (answer);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-03 23:56:24 +0000