Vendor import of BIND 9.6.1

6 files changed, 171 insertions, 28 deletions

diff --git a/lib/dns/api b/lib/dns/api
index 5ef8dc0..af155ca 100644
--- a/lib/dns/api
+++ b/lib/dns/api
@@ -1,3 +1,3 @@
-LIBINTERFACE = 51
-LIBREVISION = 1
-LIBAGE = 1
+LIBINTERFACE = 52
+LIBREVISION = 0
+LIBAGE = 2
diff --git a/lib/dns/dnssec.c b/lib/dns/dnssec.c
index f06d715..baf3ec5 100644
--- a/lib/dns/dnssec.c
+++ b/lib/dns/dnssec.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2004-2008  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2004-2009  Internet Systems Consortium, Inc. ("ISC")
  * Copyright (C) 1999-2003  Internet Software Consortium.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
@@ -16,7 +16,7 @@
  */
 
 /*
- * $Id: dnssec.c,v 1.93 2008/11/14 23:47:33 tbox Exp $
+ * $Id: dnssec.c,v 1.93.12.4 2009/06/08 23:47:00 tbox Exp $
  */
 
 /*! \file */
diff --git a/lib/dns/include/dns/dnssec.h b/lib/dns/include/dns/dnssec.h
index f8a59d0..c5206be 100644
--- a/lib/dns/include/dns/dnssec.h
+++ b/lib/dns/include/dns/dnssec.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2004-2007, 2009  Internet Systems Consortium, Inc. ("ISC")
  * Copyright (C) 1999-2002  Internet Software Consortium.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: dnssec.h,v 1.32 2007/06/19 23:47:16 tbox Exp $ */
+/* $Id: dnssec.h,v 1.32.332.4 2009/06/08 23:47:00 tbox Exp $ */
 
 #ifndef DNS_DNSSEC_H
 #define DNS_DNSSEC_H 1
diff --git a/lib/dns/include/dns/keyvalues.h b/lib/dns/include/dns/keyvalues.h
index 7040389..7f509e6 100644
--- a/lib/dns/include/dns/keyvalues.h
+++ b/lib/dns/include/dns/keyvalues.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2004-2008  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2004-2009  Internet Systems Consortium, Inc. ("ISC")
  * Copyright (C) 1999-2001, 2003  Internet Software Consortium.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: keyvalues.h,v 1.23 2008/09/25 04:02:39 tbox Exp $ */
+/* $Id: keyvalues.h,v 1.23.48.2 2009/06/04 02:56:14 tbox Exp $ */
 
 #ifndef DNS_KEYVALUES_H
 #define DNS_KEYVALUES_H 1
@@ -42,7 +42,7 @@
 #define DNS_KEYOWNER_ENTITY	0x0200	/*%< key is assoc. with entity eg host */
 #define DNS_KEYOWNER_ZONE	0x0100	/*%< key is zone key */
 #define DNS_KEYOWNER_RESERVED	0x0300	/*%< reserved meaning */
-#define DNS_KEYFLAG_RESERVED8	0x0080	/*%< reserved - must be zero */
+#define DNS_KEYFLAG_REVOKE	0x0080	/*%< key revoked (per rfc5001) */
 #define DNS_KEYFLAG_RESERVED9	0x0040	/*%< reserved - must be zero */
 #define DNS_KEYFLAG_RESERVED10	0x0020	/*%< reserved - must be zero */
 #define DNS_KEYFLAG_RESERVED11	0x0010	/*%< reserved - must be zero */
diff --git a/lib/dns/nsec3.c b/lib/dns/nsec3.c
index 54a6993..f9b8cad 100644
--- a/lib/dns/nsec3.c
+++ b/lib/dns/nsec3.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006, 2008  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2006, 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -14,7 +14,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: nsec3.c,v 1.6 2008/11/17 23:46:42 marka Exp $ */
+/* $Id: nsec3.c,v 1.6.12.2 2009/06/04 02:56:14 tbox Exp $ */
 
 #include <config.h>
 
@@ -943,6 +943,42 @@ dns_nsec3_addnsec3s(dns_db_t *db, dns_dbversion_t *version,
 	return (result);
 }
 
+/*%
+ * Determine whether any NSEC3 records that were associated with
+ * 'name' should be deleted or if they should continue to exist.
+ * ISC_TRUE indicates they should be deleted.
+ * ISC_FALSE indicates they should be retained.
+ */
+static isc_result_t
+deleteit(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
+	 isc_boolean_t *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 = ISC_FALSE;
+		return (ISC_R_SUCCESS);
+	}
+	if (result == DNS_R_GLUE || result == DNS_R_DNAME ||
+	    result == DNS_R_DELEGATION || result == DNS_R_NXDOMAIN) {
+		*yesno = ISC_TRUE;
+		return (ISC_R_SUCCESS);
+	}
+	/*
+	 * Silence compiler.
+	 */
+	*yesno = ISC_TRUE;
+	return (result);
+}
+
 isc_result_t
 dns_nsec3_delnsec3(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
 		   const dns_rdata_nsec3param_t *nsec3param, dns_diff_t *diff)
@@ -961,7 +997,7 @@ dns_nsec3_delnsec3(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
 	dns_rdata_t rdata = DNS_RDATA_INIT;
 	dns_rdataset_t rdataset;
 	int pass;
-	isc_boolean_t exists;
+	isc_boolean_t yesno;
 	isc_buffer_t buffer;
 	isc_result_t result;
 	unsigned char *salt;
@@ -1096,8 +1132,8 @@ dns_nsec3_delnsec3(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
 		if (labels <= dns_name_countlabels(origin))
 			break;
 		dns_name_getlabelsequence(&empty, 1, labels, &empty);
-		CHECK(name_exists(db, version, &empty, &exists));
-		if (exists)
+		CHECK(deleteit(db, version, &empty, &yesno));
+		if (!yesno)
 			break;
 
 		CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length,
diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
index a1c263e..a5d7c25 100644
--- a/lib/dns/resolver.c
+++ b/lib/dns/resolver.c
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: resolver.c,v 1.384.14.12 2009/05/11 02:38:03 tbox Exp $ */
+/* $Id: resolver.c,v 1.384.14.14 2009/06/02 23:47:13 tbox Exp $ */
 
 /*! \file */
 
@@ -472,6 +472,30 @@ valcreate(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo, dns_name_t *name,
 }
 
 static isc_boolean_t
+rrsig_fromchildzone(fetchctx_t *fctx, dns_rdataset_t *rdataset) {
+	dns_namereln_t namereln;
+	dns_rdata_rrsig_t rrsig;
+	dns_rdata_t rdata = DNS_RDATA_INIT;
+	int order;
+	isc_result_t result;
+	unsigned int labels;
+
+	for (result = dns_rdataset_first(rdataset);
+	     result == ISC_R_SUCCESS;
+	     result = dns_rdataset_next(rdataset)) {
+		dns_rdataset_current(rdataset, &rdata);
+		result = dns_rdata_tostruct(&rdata, &rrsig, NULL);
+		RUNTIME_CHECK(result == ISC_R_SUCCESS);
+		namereln = dns_name_fullcompare(&rrsig.signer, &fctx->domain,
+						&order, &labels);
+		if (namereln == dns_namereln_subdomain)
+			return (ISC_TRUE);
+		dns_rdata_reset(&rdata);
+	}
+	return (ISC_FALSE);
+}
+
+static isc_boolean_t
 fix_mustbedelegationornxdomain(dns_message_t *message, fetchctx_t *fctx) {
 	dns_name_t *name;
 	dns_name_t *domain = &fctx->domain;
@@ -484,13 +508,43 @@ fix_mustbedelegationornxdomain(dns_message_t *message, fetchctx_t *fctx) {
 		return (ISC_FALSE);
 
 	/*
-	 * Look for BIND 8 style delegations.
-	 * Also look for answers to ANY queries where the duplicate NS RRset
-	 * may have been stripped from the authority section.
+	 * A DS RRset can appear anywhere in a zone, even for a delegation-only
+	 * zone.  So a response to an explicit query for this type should be
+	 * excluded from delegation-only fixup.
+	 *
+	 * SOA, NS, and DNSKEY can only exist at a zone apex, so a postive
+	 * response to a query for these types can never violate the
+	 * delegation-only assumption: if the query name is below a
+	 * zone cut, the response should normally be a referral, which should
+	 * be accepted; if the query name is below a zone cut but the server
+	 * happens to have authority for the zone of the query name, the
+	 * response is a (non-referral) answer.  But this does not violate
+	 * delegation-only because the query name must be in a different zone
+	 * due to the "apex-only" nature of these types.  Note that if the
+	 * remote server happens to have authority for a child zone of a
+	 * delegation-only zone, we may still incorrectly "fix" the response
+	 * with NXDOMAIN for queries for other types.  Unfortunately it's
+	 * generally impossible to differentiate this case from violation of
+	 * the delegation-only assumption.  Once the resolver learns the
+	 * correct zone cut, possibly via a separate query for an "apex-only"
+	 * type, queries for other types will be resolved correctly.
+	 *
+	 * A query for type ANY will be accepted if it hits an exceptional
+	 * type above in the answer section as it should be from a child
+	 * zone.
+	 *
+	 * Also accept answers with RRSIG records from the child zone.
+	 * Direct queries for RRSIG records should not be answered from
+	 * the parent zone.
 	 */
+
 	if (message->counts[DNS_SECTION_ANSWER] != 0 &&
 	    (fctx->type == dns_rdatatype_ns ||
-	     fctx->type == dns_rdatatype_any)) {
+	     fctx->type == dns_rdatatype_ds ||
+	     fctx->type == dns_rdatatype_soa ||
+	     fctx->type == dns_rdatatype_any ||
+	     fctx->type == dns_rdatatype_rrsig ||
+	     fctx->type == dns_rdatatype_dnskey)) {
 		result = dns_message_firstname(message, DNS_SECTION_ANSWER);
 		while (result == ISC_R_SUCCESS) {
 			name = NULL;
@@ -499,10 +553,32 @@ fix_mustbedelegationornxdomain(dns_message_t *message, fetchctx_t *fctx) {
 			for (rdataset = ISC_LIST_HEAD(name->list);
 			     rdataset != NULL;
 			     rdataset = ISC_LIST_NEXT(rdataset, link)) {
-				type = rdataset->type;
-				if (type != dns_rdatatype_ns)
+				if (!dns_name_equal(name, &fctx->name))
 					continue;
-				if (dns_name_issubdomain(name, domain))
+				type = rdataset->type;
+				/*
+				 * RRsig from child?
+				 */
+				if (type == dns_rdatatype_rrsig &&
+				    rrsig_fromchildzone(fctx, rdataset))
+					return (ISC_FALSE);
+				/*
+				 * Direct query for apex records or DS.
+				 */
+				if (fctx->type == type &&
+				    (type == dns_rdatatype_ds ||
+				     type == dns_rdatatype_ns ||
+				     type == dns_rdatatype_soa ||
+				     type == dns_rdatatype_dnskey))
+					return (ISC_FALSE);
+				/*
+				 * Indirect query for apex records or DS.
+				 */
+				if (fctx->type == dns_rdatatype_any &&
+				    (type == dns_rdatatype_ns ||
+				     type == dns_rdatatype_ds ||
+				     type == dns_rdatatype_soa ||
+				     type == dns_rdatatype_dnskey))
 					return (ISC_FALSE);
 			}
 			result = dns_message_nextname(message,
@@ -510,7 +586,14 @@ fix_mustbedelegationornxdomain(dns_message_t *message, fetchctx_t *fctx) {
 		}
 	}
 
-	/* Look for referral. */
+	/*
+	 * A NODATA response to a DS query?
+	 */
+	if (fctx->type == dns_rdatatype_ds &&
+	    message->counts[DNS_SECTION_ANSWER] == 0)
+		return (ISC_FALSE);
+
+	/* Look for referral or indication of answer from child zone? */
 	if (message->counts[DNS_SECTION_AUTHORITY] == 0)
 		goto munge;
 
@@ -525,13 +608,37 @@ fix_mustbedelegationornxdomain(dns_message_t *message, fetchctx_t *fctx) {
 			if (type == dns_rdatatype_soa &&
 			    dns_name_equal(name, domain))
 				keep_auth = ISC_TRUE;
+
 			if (type != dns_rdatatype_ns &&
-			    type != dns_rdatatype_soa)
+			    type != dns_rdatatype_soa &&
+			    type != dns_rdatatype_rrsig)
 				continue;
-			if (dns_name_equal(name, domain))
-				goto munge;
-			if (dns_name_issubdomain(name, domain))
+
+			if (type == dns_rdatatype_rrsig) {
+				if (rrsig_fromchildzone(fctx, rdataset))
+					return (ISC_FALSE);
+				else
+					continue;
+			}
+
+			/* NS or SOA records. */
+			if (dns_name_equal(name, domain)) {
+				/*
+				 * If a query for ANY causes a negative
+				 * response, we can be sure that this is
+				 * an empty node.  For other type of queries
+				 * we cannot differentiate an empty node
+				 * from a node that just doesn't have that
+				 * type of record.  We only accept the former
+				 * case.
+				 */
+				if (message->counts[DNS_SECTION_ANSWER] == 0 &&
+				    fctx->type == dns_rdatatype_any)
+					return (ISC_FALSE);
+			} else if (dns_name_issubdomain(name, domain)) {
+				/* Referral or answer from child zone. */
 				return (ISC_FALSE);
+			}
 		}
 		result = dns_message_nextname(message, DNS_SECTION_AUTHORITY);
 	}