394 lines
14 KiB
Diff
394 lines
14 KiB
Diff
--- unbound-1.4.17.orig/doc/unbound.conf.5.in
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+++ unbound-1.4.17/doc/unbound.conf.5.in
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@@ -519,6 +519,13 @@ authority servers and checks if the repl
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Disabled by default.
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This feature is an experimental implementation of draft dns\-0x20.
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.TP
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+.B aaaa\-filter: \fI<yes or no>
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+Activate behavior similar to BIND's AAAA-filter.
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+This forces the dropping of all AAAA records, unless in the case of
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+explicit AAAA queries, when no A records have been confirmed.
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+This also causes an additional A query to be sent for each AAAA query.
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+This breaks DNSSEC!
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+.TP
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.B private\-address: \fI<IP address or subnet>
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Give IPv4 of IPv6 addresses or classless subnets. These are addresses
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on your private network, and are not allowed to be returned for public
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--- unbound-1.4.17.orig/util/config_file.c
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+++ unbound-1.4.17/util/config_file.c
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@@ -160,6 +160,7 @@ config_create(void)
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cfg->harden_below_nxdomain = 0;
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cfg->harden_referral_path = 0;
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cfg->use_caps_bits_for_id = 0;
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+ cfg->aaaa_filter = 0; /* ASN: default is disabled */
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cfg->private_address = NULL;
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cfg->private_domain = NULL;
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cfg->unwanted_threshold = 0;
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--- unbound-1.4.17.orig/iterator/iter_scrub.c
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+++ unbound-1.4.17/iterator/iter_scrub.c
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@@ -580,6 +580,32 @@ static int sanitize_nsec_is_overreach(st
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}
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/**
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+ * ASN: Lookup A records from rrset cache.
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+ * @param qinfo: the question originally asked.
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+ * @param env: module environment with config and cache.
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+ * @param ie: iterator environment with private address data.
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+ * @return 0 if no A record found, 1 if A record found.
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+ */
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+static int
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+asn_lookup_a_record_from_cache(struct query_info* qinfo,
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+ struct module_env* env, struct iter_env* ie)
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+{
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+ struct ub_packed_rrset_key* akey;
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+
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+ /* get cached A records for queried name */
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+ akey = rrset_cache_lookup(env->rrset_cache, qinfo->qname,
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+ qinfo->qname_len, LDNS_RR_TYPE_A, qinfo->qclass,
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+ 0, *env->now, 0);
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+ if(akey) { /* we had some. */
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+ log_rrset_key(VERB_ALGO, "ASN-AAAA-filter: found A record",
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+ akey);
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+ lock_rw_unlock(&akey->entry.lock);
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+ return 1;
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+ }
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+ return 0;
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+}
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+
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+/**
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* Given a response event, remove suspect RRsets from the response.
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* "Suspect" rrsets are potentially poison. Note that this routine expects
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* the response to be in a "normalized" state -- that is, all "irrelevant"
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@@ -598,6 +625,7 @@ scrub_sanitize(ldns_buffer* pkt, struct
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struct query_info* qinfo, uint8_t* zonename, struct module_env* env,
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struct iter_env* ie)
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{
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+ int found_a_record = 0; /* ASN: do we have a A record? */
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int del_addi = 0; /* if additional-holding rrsets are deleted, we
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do not trust the normalized additional-A-AAAA any more */
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struct rrset_parse* rrset, *prev;
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@@ -633,6 +661,13 @@ scrub_sanitize(ldns_buffer* pkt, struct
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rrset = rrset->rrset_all_next;
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}
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+ /* ASN: Locate any A record we can find */
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+ if((ie->aaaa_filter) && (qinfo->qtype == LDNS_RR_TYPE_AAAA)) {
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+ found_a_record = asn_lookup_a_record_from_cache(qinfo,
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+ env, ie);
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+ }
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+ /* ASN: End of added code */
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+
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/* At this point, we brutally remove ALL rrsets that aren't
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* children of the originating zone. The idea here is that,
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* as far as we know, the server that we contacted is ONLY
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@@ -644,6 +679,24 @@ scrub_sanitize(ldns_buffer* pkt, struct
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rrset = msg->rrset_first;
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while(rrset) {
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+ /* ASN: For AAAA records only... */
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+ if((ie->aaaa_filter) && (rrset->type == LDNS_RR_TYPE_AAAA)) {
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+ /* ASN: If this is not a AAAA query, then remove AAAA
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+ * records, no questions asked. If this IS a AAAA query
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+ * then remove AAAA records if we have an A record.
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+ * Otherwise, leave things be. */
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+ if((qinfo->qtype != LDNS_RR_TYPE_AAAA) ||
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+ (found_a_record)) {
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+ remove_rrset("ASN-AAAA-filter: removing AAAA "
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+ "for record", pkt, msg, prev, &rrset);
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+ continue;
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+ }
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+ log_nametypeclass(VERB_ALGO, "ASN-AAAA-filter: "
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+ "keep AAAA for", zonename,
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+ LDNS_RR_TYPE_AAAA, qinfo->qclass);
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+ }
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+ /* ASN: End of added code */
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+
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/* remove private addresses */
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if( (rrset->type == LDNS_RR_TYPE_A ||
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rrset->type == LDNS_RR_TYPE_AAAA) &&
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--- unbound-1.4.17.orig/iterator/iterator.c
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+++ unbound-1.4.17/iterator/iterator.c
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@@ -1579,6 +1579,53 @@ processDSNSFind(struct module_qstate* qs
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return 0;
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}
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+
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+/**
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+ * ASN: This event state was added as an intermediary step between
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+ * QUERYTARGETS_STATE and the next step, in order to cast a subquery for the
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+ * purpose of caching A records for the queried name.
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+ *
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+ * @param qstate: query state.
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+ * @param iq: iterator query state.
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+ * @param ie: iterator shared global environment.
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+ * @param id: module id.
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+ * @return true if the event requires more request processing immediately,
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+ * false if not. This state only returns true when it is generating
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+ * a SERVFAIL response because the query has hit a dead end.
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+ */
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+static int
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+asn_processQueryAAAA(struct module_qstate* qstate, struct iter_qstate* iq,
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+ struct iter_env* ie, int id)
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+{
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+ struct module_qstate* subq = NULL;
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+
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+ log_assert(iq->fetch_a_for_aaaa == 0);
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+
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+ /* flag the query properly in order to not loop */
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+ iq->fetch_a_for_aaaa = 1;
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+
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+ /* re-throw same query, but with a different type */
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+ if(!generate_sub_request(iq->qchase.qname,
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+ iq->qchase.qname_len, LDNS_RR_TYPE_A,
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+ iq->qchase.qclass, qstate, id, iq,
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+ INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
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+ log_nametypeclass(VERB_ALGO, "ASN-AAAA-filter: failed "
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+ "preloading of A record for",
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+ iq->qchase.qname, LDNS_RR_TYPE_A,
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+ iq->qchase.qclass);
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+ return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
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+ }
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+ log_nametypeclass(VERB_ALGO, "ASN-AAAA-filter: "
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+ "preloading records in cache for",
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+ iq->qchase.qname, LDNS_RR_TYPE_A,
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+ iq->qchase.qclass);
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+
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+ /* set this query as waiting */
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+ qstate->ext_state[id] = module_wait_subquery;
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+ /* at this point break loop */
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+ return 0;
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+}
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+/* ASN: End of added code */
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/**
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* This is the request event state where the request will be sent to one of
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@@ -1626,6 +1673,13 @@ processQueryTargets(struct module_qstate
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return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
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}
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+ /* ASN: If we have a AAAA query, then also query for A records */
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+ if((ie->aaaa_filter) && (iq->qchase.qtype == LDNS_RR_TYPE_AAAA) &&
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+ (iq->fetch_a_for_aaaa == 0)) {
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+ return next_state(iq, ASN_FETCH_A_FOR_AAAA_STATE);
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+ }
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+ /* ASN: End of added code */
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+
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/* Make sure we have a delegation point, otherwise priming failed
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* or another failure occurred */
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if(!iq->dp) {
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@@ -2568,6 +2622,62 @@ processFinished(struct module_qstate* qs
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return 0;
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}
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+/**
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+ * ASN: Do final processing on responses to A queries originated from AAAA
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+ * queries. Events reach this state after the iterative resolution algorithm
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+ * terminates.
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+ * This is required down the road to decide whether to scrub AAAA records
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+ * from the results or not.
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+ *
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+ * @param qstate: query state.
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+ * @param id: module id.
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+ * @param forq: super query state.
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+ */
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+static void
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+asn_processAAAAResponse(struct module_qstate* qstate, int id,
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+ struct module_qstate* super)
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+{
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+ struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
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+ struct iter_qstate* super_iq = (struct iter_qstate*)super->minfo[id];
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+ struct ub_packed_rrset_key* rrset;
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+ struct delegpt_ns* dpns = NULL;
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+ int error = (qstate->return_rcode != LDNS_RCODE_NOERROR);
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+
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+ log_assert(super_iq->fetch_a_for_aaaa > 0);
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+
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+ /* let super go to evaluation of targets after this */
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+ super_iq->state = QUERYTARGETS_STATE;
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+
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+ log_query_info(VERB_ALGO, "ASN-AAAA-filter: processAAAAResponse",
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+ &qstate->qinfo);
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+ log_query_info(VERB_ALGO, "ASN-AAAA-filter: processAAAAResponse super",
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+ &super->qinfo);
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+
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+ if(super_iq->dp)
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+ dpns = delegpt_find_ns(super_iq->dp,
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+ qstate->qinfo.qname, qstate->qinfo.qname_len);
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+ if (!dpns) {
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+ /* not interested */
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+ verbose(VERB_ALGO, "ASN-AAAA-filter: subq: %s, but parent not "
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+ "interested%s", (error ? "error, but" : "success"),
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+ (super_iq->dp ? "anymore" : " (was reset)"));
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+ log_query_info(VERB_ALGO, "ASN-AAAA-filter: superq", &super->qinfo);
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+ if(super_iq->dp && error)
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+ delegpt_log(VERB_ALGO, super_iq->dp);
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+ return;
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+ } else if (error) {
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+ verbose(VERB_ALGO, "ASN-AAAA-filter: mark as failed, "
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+ "and go to target query.");
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+ /* see if the failure did get (parent-lame) info */
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+ if(!cache_fill_missing(super->env,
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+ super_iq->qchase.qclass, super->region,
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+ super_iq->dp))
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+ log_err("ASN-AAAA-filter: out of memory adding missing");
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+ dpns->resolved = 1; /* mark as failed */
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+ }
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+}
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+/* ASN: End of added code */
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+
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/*
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* Return priming query results to interestes super querystates.
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*
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@@ -2587,6 +2697,9 @@ iter_inform_super(struct module_qstate*
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else if(super->qinfo.qtype == LDNS_RR_TYPE_DS && ((struct iter_qstate*)
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super->minfo[id])->state == DSNS_FIND_STATE)
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processDSNSResponse(qstate, id, super);
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+ else if (super->qinfo.qtype == LDNS_RR_TYPE_AAAA && ((struct iter_qstate*)
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+ super->minfo[id])->state == ASN_FETCH_A_FOR_AAAA_STATE)
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+ asn_processAAAAResponse(qstate, id, super);
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else if(qstate->return_rcode != LDNS_RCODE_NOERROR)
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error_supers(qstate, id, super);
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else if(qstate->is_priming)
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@@ -2624,6 +2737,9 @@ iter_handle(struct module_qstate* qstate
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case INIT_REQUEST_3_STATE:
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cont = processInitRequest3(qstate, iq, id);
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break;
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+ case ASN_FETCH_A_FOR_AAAA_STATE:
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+ cont = asn_processQueryAAAA(qstate, iq, ie, id);
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+ break;
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case QUERYTARGETS_STATE:
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cont = processQueryTargets(qstate, iq, ie, id);
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break;
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@@ -2863,6 +2979,8 @@ iter_state_to_string(enum iter_state sta
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return "INIT REQUEST STATE (stage 2)";
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case INIT_REQUEST_3_STATE:
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return "INIT REQUEST STATE (stage 3)";
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+ case ASN_FETCH_A_FOR_AAAA_STATE:
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+ return "ASN_FETCH_A_FOR_AAAA_STATE";
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case QUERYTARGETS_STATE :
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return "QUERY TARGETS STATE";
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case PRIME_RESP_STATE :
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@@ -2887,6 +3005,7 @@ iter_state_is_responsestate(enum iter_st
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case INIT_REQUEST_STATE :
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case INIT_REQUEST_2_STATE :
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case INIT_REQUEST_3_STATE :
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+ case ASN_FETCH_A_FOR_AAAA_STATE :
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case QUERYTARGETS_STATE :
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case COLLECT_CLASS_STATE :
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return 0;
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--- unbound-1.4.17.orig/iterator/iter_utils.c
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+++ unbound-1.4.17/iterator/iter_utils.c
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@@ -128,6 +128,7 @@ iter_apply_cfg(struct iter_env* iter_env
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}
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iter_env->supports_ipv6 = cfg->do_ip6;
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iter_env->supports_ipv4 = cfg->do_ip4;
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+ iter_env->aaaa_filter = cfg->aaaa_filter;
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return 1;
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}
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--- unbound-1.4.17.orig/iterator/iterator.h
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+++ unbound-1.4.17/iterator/iterator.h
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@@ -110,6 +110,9 @@ struct iter_env {
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* array of max_dependency_depth+1 size.
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*/
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int* target_fetch_policy;
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+
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+ /** ASN: AAAA-filter flag */
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+ int aaaa_filter;
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};
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/**
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@@ -135,6 +138,14 @@ enum iter_state {
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INIT_REQUEST_3_STATE,
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/**
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+ * This state is responsible for intercepting AAAA queries,
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+ * and launch a A subquery on the same target, to populate the
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+ * cache with A records, so the AAAA filter scrubbing logic can
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+ * work.
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+ */
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+ ASN_FETCH_A_FOR_AAAA_STATE,
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+
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+ /**
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* Each time a delegation point changes for a given query or a
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* query times out and/or wakes up, this state is (re)visited.
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* This state is responsible for iterating through a list of
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@@ -309,6 +320,13 @@ struct iter_qstate {
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*/
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int refetch_glue;
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+ /**
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+ * ASN: This is a flag that, if true, means that this query is
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+ * for fetching A records to populate cache and determine if we must
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+ * return AAAA records or not.
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+ */
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+ int fetch_a_for_aaaa;
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+
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/** list of pending queries to authoritative servers. */
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struct outbound_list outlist;
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};
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--- unbound-1.4.17.orig/util/config_file.h
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+++ unbound-1.4.17/util/config_file.h
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@@ -169,6 +169,8 @@ struct config_file {
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int harden_referral_path;
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/** use 0x20 bits in query as random ID bits */
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int use_caps_bits_for_id;
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+ /** ASN: enable AAAA filter? */
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+ int aaaa_filter;
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/** strip away these private addrs from answers, no DNS Rebinding */
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struct config_strlist* private_address;
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/** allow domain (and subdomains) to use private address space */
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--- unbound-1.4.17.orig/util/configlexer.lex
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+++ unbound-1.4.17/util/configlexer.lex
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@@ -177,6 +177,7 @@ harden-below-nxdomain{COLON} { YDVAR(1,
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harden-referral-path{COLON} { YDVAR(1, VAR_HARDEN_REFERRAL_PATH) }
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use-caps-for-id{COLON} { YDVAR(1, VAR_USE_CAPS_FOR_ID) }
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unwanted-reply-threshold{COLON} { YDVAR(1, VAR_UNWANTED_REPLY_THRESHOLD) }
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+aaaa-filter{COLON} { YDVAR(1, VAR_AAAA_FILTER) }
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private-address{COLON} { YDVAR(1, VAR_PRIVATE_ADDRESS) }
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private-domain{COLON} { YDVAR(1, VAR_PRIVATE_DOMAIN) }
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prefetch-key{COLON} { YDVAR(1, VAR_PREFETCH_KEY) }
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--- unbound-1.4.17.orig/util/configparser.y
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+++ unbound-1.4.17/util/configparser.y
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@@ -92,6 +92,7 @@ extern struct config_parser_state* cfg_p
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%token VAR_STATISTICS_CUMULATIVE VAR_OUTGOING_PORT_PERMIT
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%token VAR_OUTGOING_PORT_AVOID VAR_DLV_ANCHOR_FILE VAR_DLV_ANCHOR
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%token VAR_NEG_CACHE_SIZE VAR_HARDEN_REFERRAL_PATH VAR_PRIVATE_ADDRESS
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+%token VAR_AAAA_FILTER
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%token VAR_PRIVATE_DOMAIN VAR_REMOTE_CONTROL VAR_CONTROL_ENABLE
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%token VAR_CONTROL_INTERFACE VAR_CONTROL_PORT VAR_SERVER_KEY_FILE
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%token VAR_SERVER_CERT_FILE VAR_CONTROL_KEY_FILE VAR_CONTROL_CERT_FILE
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@@ -151,6 +152,7 @@ content_server: server_num_threads | ser
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server_dlv_anchor_file | server_dlv_anchor | server_neg_cache_size |
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server_harden_referral_path | server_private_address |
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server_private_domain | server_extended_statistics |
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+ server_aaaa_filter |
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server_local_data_ptr | server_jostle_timeout |
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server_unwanted_reply_threshold | server_log_time_ascii |
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server_domain_insecure | server_val_sig_skew_min |
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@@ -802,6 +803,15 @@ server_use_caps_for_id: VAR_USE_CAPS_FOR
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free($2);
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}
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;
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+server_aaaa_filter: VAR_AAAA_FILTER STRING_ARG
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+ {
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+ OUTYY(("P(server_aaaa_filter:%s)\n", $2));
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+ if(strcmp($2, "yes") != 0 && strcmp($2, "no") != 0)
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+ yyerror("expected yes or no.");
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+ else cfg_parser->cfg->aaaa_filter = (strcmp($2, "yes")==0);
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+ free($2);
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+ }
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+ ;
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server_private_address: VAR_PRIVATE_ADDRESS STRING_ARG
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{
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OUTYY(("P(server_private_address:%s)\n", $2));
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--- unbound-1.4.17.orig/pythonmod/interface.i
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+++ unbound-1.4.17/pythonmod/interface.i
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@@ -626,6 +626,7 @@ struct config_file {
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int harden_dnssec_stripped;
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int harden_referral_path;
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int use_caps_bits_for_id;
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+ int aaaa_filter; /* ASN */
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struct config_strlist* private_address;
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struct config_strlist* private_domain;
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size_t unwanted_threshold;
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