Scrub DNSKEY, DLV and DS much more stringently.

git-svn-id: file:///svn/unbound/trunk@1985 be551aaa-1e26-0410-a405-d3ace91eadb9

doc/Changelog

@@ -1,3 +1,8 @@
+17 February 2010: Wouter
+	- Disregard DNSKEY from authority section for chain of trust.
+	  DS records that are irrelevant to a referral scrubbed.  Anti-poison.
+	- iana portlist updated.
+
 16 February 2010: Wouter
 	- Check for 'no space left on device' (or other errors) when 
 	  writing updated autotrust anchors and print errno to log.

iterator/iter_utils.c

@@ -755,3 +755,30 @@ iter_get_next_root(struct iter_hints* hints, struct iter_forwards* fwd,
 	else	*c = c2;
 	return 1;
 }
+
+void
+iter_scrub_ds(struct ub_packed_rrset_key* ns, struct dns_msg* msg)
+{
+	/* Only the DS record for the delegation itself is expected.
+	 * We allow DS for everything between the bailiwick and the 
+	 * zonecut, thus DS records must be at or above the zonecut.
+	 * The answer section is already scrubbed. */
+	size_t i = msg->rep->an_numrrsets;
+	while(i < (msg->rep->an_numrrsets + msg->rep->ns_numrrsets)) {
+		struct ub_packed_rrset_key* s = msg->rep->rrsets[i];
+		if(ntohs(s->rk.type) == LDNS_RR_TYPE_DS &&
+			!dname_subdomain_c(ns->rk.dname, s->rk.dname)) {
+			log_nametypeclass(VERB_ALGO, "removing irrelevant DS "
+				"from referral", s->rk.dname, 
+				ntohs(s->rk.type), ntohs(s->rk.rrset_class));
+			memmove(msg->rep->rrsets+i, msg->rep->rrsets+i+1,
+				sizeof(struct ub_packed_rrset_key*) * 
+				(msg->rep->rrset_count-i-1));
+			msg->rep->ns_numrrsets--;
+			msg->rep->rrset_count--;
+			/* stay at same i, but new record */
+			continue;
+		}
+		i++;
+	}
+}

iterator/iter_utils.h

@@ -57,6 +57,7 @@ struct query_info;
 struct reply_info;
 struct module_qstate;
 struct sock_list;
+struct ub_packed_rrset_key;
 
 /**
  * Process config options and set iterator module state.
@@ -245,4 +246,11 @@ int iter_lookup_inzone_glue(struct module_env* env, struct delegpt* dp,
 int iter_get_next_root(struct iter_hints* hints, struct iter_forwards* fwd,
 	uint16_t* c);
 
+/**
+ * Remove DS records that are inappropriate before they are cached.
+ * @param ns: RRSET that is the NS record for the referral.
+ * @param msg: the response to scrub.
+ */
+void iter_scrub_ds(struct ub_packed_rrset_key* ns, struct dns_msg* msg);
+
 #endif /* ITERATOR_ITER_UTILS_H */

iterator/iterator.c

@@ -1612,7 +1612,8 @@ processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
 			|| !dname_subdomain_c(iq->qchase.qname, ns->rk.dname)){
 			verbose(VERB_ALGO, "bad referral, throwaway");
 			type = RESPONSE_TYPE_THROWAWAY;
-		}
+		} else
+			iter_scrub_ds(ns, iq->response);
 	}
 
 	/* handle each of the type cases */
@@ -1650,11 +1651,11 @@ processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
 			    * see if that equals the query name... */
 			&& ( /* auth section, but sometimes in answer section*/
 			  reply_find_rrset_section_ns(iq->response->rep,
-				qstate->qinfo.qname, qstate->qinfo.qname_len,
-				LDNS_RR_TYPE_NS, qstate->qinfo.qclass)
+				iq->qchase.qname, iq->qchase.qname_len,
+				LDNS_RR_TYPE_NS, iq->qchase.qclass)
 			  || reply_find_rrset_section_an(iq->response->rep,
-				qstate->qinfo.qname, qstate->qinfo.qname_len,
-				LDNS_RR_TYPE_NS, qstate->qinfo.qclass)
+				iq->qchase.qname, iq->qchase.qname_len,
+				LDNS_RR_TYPE_NS, iq->qchase.qclass)
 			  )
 		    )) {
 			/* Store the referral under the current query */

services/cache/dns.c

@@ -698,7 +698,10 @@ dns_cache_lookup(struct module_env* env,
 		struct packed_rrset_data *d = (struct packed_rrset_data*)
 			rrset->entry.data;
 		if(d->trust != rrset_trust_add_noAA && 
-			d->trust != rrset_trust_add_AA) {
+			d->trust != rrset_trust_add_AA && 
+			(qtype == LDNS_RR_TYPE_DS || 
+				(d->trust != rrset_trust_auth_noAA 
+				&& d->trust != rrset_trust_auth_AA) )) {
 			struct dns_msg* msg = rrset_msg(rrset, region, now, &k);
 			if(msg) {
 				lock_rw_unlock(&rrset->entry.lock);

util/iana_ports.inc

@@ -4502,6 +4502,7 @@
 7025,
 7030,
 7070,
+7071,
 7080,
 7099,
 7100,