new option "dnskey-sig-validity"

- overrides "sig-validity-interval" for DNSKEY, CDNSKEY and CDS RRSIGs

CHANGES

+4928.	[func]		The "dnskey-sig-validity" option allows
+			"sig-validity-interval" to be overriden for signatures
+			covering DNSKEY RRsets. [GL #145]
+
 4927.	[placeholder]
 
 4926.	[func]		Add root key sentinel support.  To disable, add

bin/named/config.c

@@ -248,6 +248,7 @@ options {\n\
 	sig-signing-signatures 10;\n\
 	sig-signing-type 65534;\n\
 	sig-validity-interval 30; /* days */\n\
+	dnskey-sig-validity 0; /* default: sig-validity-interval */\n\
 	transfer-source *;\n\
 	transfer-source-v6 *;\n\
 	try-tcp-refresh yes; /* BIND 8 compat */\n\

bin/named/zoneconf.c

@@ -1440,6 +1440,12 @@ named_zone_configure(const cfg_obj_t *config, const cfg_obj_t *vconfig,
 	if (ztype == dns_zone_master || raw != NULL) {
 		isc_boolean_t allow = ISC_FALSE, maint = ISC_FALSE;
 
+		obj = NULL;
+		result = named_config_get(maps, "dnskey-sig-validity", &obj);
+		INSIST(result == ISC_R_SUCCESS && obj != NULL);
+		seconds = cfg_obj_asuint32(obj) * 86400;
+		dns_zone_setkeyvalidityinterval(zone, seconds);
+
 		obj = NULL;
 		result = named_config_get(maps, "sig-validity-interval", &obj);
 		INSIST(result == ISC_R_SUCCESS && obj != NULL);

bin/tests/system/checkconf/bad-dnskey-validity.conf

+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * 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 http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+options {
+	dnskey-sig-validity 5000;	/* maximum value 10 years, this is 14 */
+};

bin/tests/system/checkconf/bad-sig-validity.conf

+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * 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 http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+options {
+    sig-validity-interval 5000;
+};

bin/tests/system/dnssec/clean.sh

@@ -96,3 +96,4 @@ rm -f signer/general/signed.zone
 rm -f signer/general/signer.out.*
 rm -f signer/general/dsset*
 rm -f signing.out*
+rm -f python.out.*

bin/tests/system/dnssec/ns3/siginterval2.conf

@@ -13,6 +13,7 @@ zone "siginterval.example" {
 	type master;
 	allow-update { any; };
 	sig-validity-interval 35 28;
+	dnskey-sig-validity 90;
 	auto-dnssec maintain;
 	file "siginterval.example.db";
 };

bin/tests/system/dnssec/tests.sh

@@ -2997,6 +2997,28 @@ n=`expr $n + 1`
 if test "$before" = "$after" ; then echo_i "failed"; ret=1; fi
 status=`expr $status + $ret`
 
+if [ -x "$PYTHON" ]; then
+    echo_i "check dnskey-sig-validity sets longer expiry for DNSKEY ($n)"
+    ret=0
+    $RNDCCMD 10.53.0.3 sign siginterval.example 2>&1 | sed 's/^/ns3 /' | cat_i
+    # convert expiry date to a comma-separated list of integers python can
+    # use as input to date(). strip leading 0s in months and days so
+    # python3 will recognize them as integers.
+    soaexpire=`$DIG +dnssec +short -p ${PORT} @10.53.0.3 soa siginterval.example | awk '$1 ~ /SOA/ { print $5 }' | sed 's/\(....\)\(..\)\(..\).*/\1, \2, \3/' | sed 's/ 0/ /'`
+    dnskeyexpire=`$DIG +dnssec +short -p ${PORT} @10.53.0.3 dnskey siginterval.example | awk '$1 ~ /DNSKEY/ { print $5; exit 0 }' | sed 's/\(....\)\(..\)\(..\).*/\1, \2, \3/' | sed 's/ 0/ /'`
+    $PYTHON > python.out.$n <<EOF
+from datetime import date;
+ke=date($dnskeyexpire)
+se=date($soaexpire)
+print((ke-se).days);
+EOF
+    diff=`cat python.out.$n`
+    [ "$diff" -ge 55 ] || ret=1
+    n=`expr $n + 1`
+    if [ $ret != 0 ]; then echo_i "failed"; fi
+    status=`expr $status + $ret`
+fi
+
 copy_setports ns4/named4.conf.in ns4/named.conf
 $RNDCCMD 10.53.0.4 reconfig 2>&1 | sed 's/^/ns4 /' | cat_i
 sleep 3

doc/arm/Bv9ARM-book.xml

@@ -8973,6 +8973,11 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
 		  set to one hour before the current time to allow
 		  for a limited amount of clock skew.
 		</para>
+		<para>
+		  The <command>sig-validity-interval</command> can be
+		  overridden for DNSKEY records by setting
+		  <command>dnskey-sig-validity</command>.
+		</para>
 		<para>
 		  The <command>sig-validity-interval</command>
 		  should be, at least, several multiples of the SOA
@@ -8982,6 +8987,24 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
 	      </listitem>
 	    </varlistentry>
 
+	    <varlistentry>
+	      <term><command>dnskey-sig-validity</command></term>
+	      <listitem>
+		<para>
+		  Specifies the number of days into the future when
+		  DNSSEC signatures that are automatically generated
+		  for DNSKEY RRsets as a result of dynamic updates
+		  (<xref linkend="dynamic_update"/>) will expire.
+		  If set to a non-zero value, this overrides the
+		  value set by <command>sig-validity-interval</command>.
+		  The default is zero, meaning
+		  <command>sig-validity-interval</command> is used.
+		  The maximum value is 3660 days (10 years), and
+		  higher values will be rejected.
+		</para>
+	      </listitem>
+	    </varlistentry>
+
 	    <varlistentry>
 	      <term><command>sig-signing-nodes</command></term>
 	      <listitem>

doc/arm/notes.xml

@@ -78,6 +78,13 @@
 	  'root-key-sentinel no;' to named.conf.
 	</para>
       </listitem>
+      <listitem>
+	<para>
+	  The <command>dnskey-sig-validity</command> option allows the
+	  <command>sig-validity-interval</command> to be overriden for
+	  signatures covering DNSKEY RRsets. [GL #145]
+	</para>
+      </listitem>
     </itemizedlist>
   </section>
 

lib/bind9/check.c

@@ -1084,6 +1084,22 @@ check_options(const cfg_obj_t *options, isc_log_t *logctx, isc_mem_t *mctx,
 		}
 	}
 
+	obj = NULL;
+	cfg_map_get(options, "dnskey-sig-validity", &obj);
+	if (obj != NULL) {
+		isc_uint32_t keyvalidity;
+
+		keyvalidity = cfg_obj_asuint32(obj);
+		if (keyvalidity > 3660 || keyvalidity == 0) { /* 10 years */
+			cfg_obj_log(obj, logctx, ISC_LOG_ERROR,
+				    "%s '%u' is out of range (1..3660)",
+				    "dnskey-sig-validity",
+				    keyvalidity);
+			result = ISC_R_RANGE;
+		}
+
+	}
+
 	obj = NULL;
 	(void)cfg_map_get(options, "preferred-glue", &obj);
 	if (obj != NULL) {

lib/dns/include/dns/zone.h

@@ -1444,9 +1444,9 @@ dns_zone_getmgr(dns_zone_t *zone);
 void
 dns_zone_setsigvalidityinterval(dns_zone_t *zone, isc_uint32_t interval);
 /*%<
- * Set the zone's RRSIG validity interval.  This is the length of time
- * for which DNSSEC signatures created as a result of dynamic updates
- * to secure zones will remain valid, in seconds.
+ * Set the zone's general signature validity interval.  This is the length
+ * of time for which DNSSEC signatures created as a result of dynamic
+ * updates to secure zones will remain valid, in seconds.
  *
  * Requires:
  * \li	'zone' to be a valid zone.
@@ -1455,7 +1455,33 @@ dns_zone_setsigvalidityinterval(dns_zone_t *zone, isc_uint32_t interval);
 isc_uint32_t
 dns_zone_getsigvalidityinterval(dns_zone_t *zone);
 /*%<
- * Get the zone's RRSIG validity interval.
+ * Get the zone's general signature validity interval.
+ *
+ * Requires:
+ * \li	'zone' to be a valid zone.
+ */
+
+void
+dns_zone_setkeyvalidityinterval(dns_zone_t *zone, isc_uint32_t interval);
+/*%<
+ * Set the zone's DNSKEY signature validity interval.  This is the length
+ * of time for which DNSSEC signatures created for DNSKEY records
+ * will remain valid, in seconds.
+ *
+ * If this value is set to zero, then the regular signature validity
+ * interval (see dns_zone_setsigvalidityinterval(), above) is used
+ * for all RRSIGs. However, if this value is nonzero, then it is used
+ * as the validity interval for RRSIGs covering DNSKEY and CDNSKEY
+ * RRsets.
+ *
+ * Requires:
+ * \li	'zone' to be a valid zone.
+ */
+
+isc_uint32_t
+dns_zone_getkeyvalidityinterval(dns_zone_t *zone);
+/*%<
+ * Get the zone's DNSKEY signature validity interval.
  *
  * Requires:
  * \li	'zone' to be a valid zone.

lib/dns/update.c

@@ -1362,7 +1362,7 @@ struct dns_update_state {
 	dns_diff_t work;
 	dst_key_t *zone_keys[DNS_MAXZONEKEYS];
 	unsigned int nkeys;
-	isc_stdtime_t inception, expire;
+	isc_stdtime_t inception, expire, keyexpire;
 	dns_ttl_t nsecttl;
 	isc_boolean_t check_ksk, keyset_kskonly, build_nsec3;
 	enum { sign_updates, remove_orphaned, build_chain, process_nsec,
@@ -1423,6 +1423,12 @@ dns_update_signaturesinc(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db,
 		isc_stdtime_get(&now);
 		state->inception = now - 3600; /* Allow for some clock skew. */
 		state->expire = now + sigvalidityinterval;
+		state->keyexpire = dns_zone_getkeyvalidityinterval(zone);
+		if (state->keyexpire == 0) {
+			state->keyexpire = state->expire;
+		} else {
+			state->keyexpire += now;
+		}
 
 		/*
 		 * Do we look at the KSK flag on the DNSKEY to determining which
@@ -1518,13 +1524,22 @@ dns_update_signaturesinc(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db,
 				CHECK(rrset_visible(db, newver, name, type,
 						   &flag));
 				if (flag) {
+					isc_stdtime_t exp;
+					if (type == dns_rdatatype_dnskey ||
+					    type == dns_rdatatype_cdnskey ||
+					    type == dns_rdatatype_cds)
+					{
+						exp = state->keyexpire;
+					} else {
+						exp = state->expire;
+					}
+
 					CHECK(add_sigs(log, zone, db, newver,
 						       name, type,
 						       &state->sig_diff,
 						       state->zone_keys,
 						       state->nkeys,
-						       state->inception,
-						       state->expire,
+						       state->inception, exp,
 						       state->check_ksk,
 						       state->keyset_kskonly));
 					sigs++;

lib/dns/zone.c

@@ -301,6 +301,7 @@ struct dns_zone {
 	isc_event_t		ctlevent;
 	dns_ssutable_t		*ssutable;
 	isc_uint32_t		sigvalidityinterval;
+	isc_uint32_t		keyvalidityinterval;
 	isc_uint32_t		sigresigninginterval;
 	dns_view_t		*view;
 	dns_view_t		*prev_view;
@@ -1013,6 +1014,7 @@ dns_zone_create(dns_zone_t **zonep, isc_mem_t *mctx) {
 	zone->maxxfrout = MAX_XFER_TIME;
 	zone->ssutable = NULL;
 	zone->sigvalidityinterval = 30 * 24 * 3600;
+	zone->keyvalidityinterval = 0;
 	zone->sigresigninginterval = 7 * 24 * 3600;
 	zone->view = NULL;
 	zone->prev_view = NULL;
@@ -7286,7 +7288,8 @@ need_nsec_chain(dns_db_t *db, dns_dbversion_t *ver,
 static isc_result_t
 update_sigs(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *version,
 	    dst_key_t *zone_keys[], unsigned int nkeys, dns_zone_t *zone,
-	    isc_stdtime_t inception, isc_stdtime_t expire, isc_stdtime_t now,
+	    isc_stdtime_t inception, isc_stdtime_t expire,
+	    isc_stdtime_t keyexpire, isc_stdtime_t now,
 	    isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly,
 	    zonediff_t *zonediff)
 {
@@ -7296,6 +7299,16 @@ update_sigs(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *version,
 	for (tuple = ISC_LIST_HEAD(diff->tuples);
 	     tuple != NULL;
 	     tuple = ISC_LIST_HEAD(diff->tuples)) {
+		isc_stdtime_t exp = expire;
+
+		if (keyexpire != 0 &&
+		    (tuple->rdata.type == dns_rdatatype_dnskey ||
+		     tuple->rdata.type == dns_rdatatype_cdnskey ||
+		     tuple->rdata.type == dns_rdatatype_cds))
+		{
+			exp = keyexpire;
+		}
+
 		result = del_sigs(zone, db, version, &tuple->name,
 				  tuple->rdata.type, zonediff,
 				  zone_keys, nkeys, now, ISC_FALSE);
@@ -7308,7 +7321,7 @@ update_sigs(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *version,
 		result = add_sigs(db, version, &tuple->name,
 				  tuple->rdata.type, zonediff->diff,
 				  zone_keys, nkeys, zone->mctx, inception,
-				  expire, check_ksk, keyset_kskonly);
+				  exp, check_ksk, keyset_kskonly);
 		if (result != ISC_R_SUCCESS) {
 			dns_zone_log(zone, ISC_LOG_ERROR,
 				     "update_sigs:add_sigs -> %s",
@@ -7961,7 +7974,7 @@ zone_nsec3chain(dns_zone_t *zone) {
 	if (nsec3chain != NULL)
 		dns_dbiterator_pause(nsec3chain->dbiterator);
 	result = update_sigs(&nsec3_diff, db, version, zone_keys,
-			     nkeys, zone, inception, expire, now,
+			     nkeys, zone, inception, expire, 0, now,
 			     check_ksk, keyset_kskonly, &zonediff);
 	if (result != ISC_R_SUCCESS) {
 		dns_zone_log(zone, ISC_LOG_ERROR, "zone_nsec3chain:"
@@ -7974,7 +7987,7 @@ zone_nsec3chain(dns_zone_t *zone) {
 	 * above so we need to update the signatures.
 	 */
 	result = update_sigs(&param_diff, db, version, zone_keys,
-			     nkeys, zone, inception, expire, now,
+			     nkeys, zone, inception, expire, 0, now,
 			     check_ksk, keyset_kskonly, &zonediff);
 	if (result != ISC_R_SUCCESS) {
 		dns_zone_log(zone, ISC_LOG_ERROR, "zone_nsec3chain:"
@@ -7994,7 +8007,7 @@ zone_nsec3chain(dns_zone_t *zone) {
 	}
 
 	result = update_sigs(&nsec_diff, db, version, zone_keys,
-			     nkeys, zone, inception, expire, now,
+			     nkeys, zone, inception, expire, 0, now,
 			     check_ksk, keyset_kskonly, &zonediff);
 	if (result != ISC_R_SUCCESS) {
 		dns_zone_log(zone, ISC_LOG_ERROR, "zone_nsec3chain:"
@@ -8577,7 +8590,7 @@ zone_sign(dns_zone_t *zone) {
 
 	if (ISC_LIST_HEAD(post_diff.tuples) != NULL) {
 		result = update_sigs(&post_diff, db, version, zone_keys,
-				     nkeys, zone, inception, expire, now,
+				     nkeys, zone, inception, expire, 0, now,
 				     check_ksk, keyset_kskonly, &zonediff);
 		if (result != ISC_R_SUCCESS) {
 			dns_zone_log(zone, ISC_LOG_ERROR, "zone_sign:"
@@ -15333,6 +15346,20 @@ dns_zone_getsigvalidityinterval(dns_zone_t *zone) {
 	return (zone->sigvalidityinterval);
 }
 
+void
+dns_zone_setkeyvalidityinterval(dns_zone_t *zone, isc_uint32_t interval) {
+	REQUIRE(DNS_ZONE_VALID(zone));
+
+	zone->keyvalidityinterval = interval;
+}
+
+isc_uint32_t
+dns_zone_getkeyvalidityinterval(dns_zone_t *zone) {
+	REQUIRE(DNS_ZONE_VALID(zone));
+
+	return (zone->keyvalidityinterval);
+}
+
 void
 dns_zone_setsigresigninginterval(dns_zone_t *zone, isc_uint32_t interval) {
 	isc_time_t now;
@@ -17477,7 +17504,7 @@ sign_apex(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver,
 	  isc_stdtime_t now, dns_diff_t *diff, zonediff_t *zonediff)
 {
 	isc_result_t result;
-	isc_stdtime_t inception, soaexpire;
+	isc_stdtime_t inception, soaexpire, keyexpire;
 	isc_boolean_t check_ksk, keyset_kskonly;
 	dst_key_t *zone_keys[DNS_MAXZONEKEYS];
 	unsigned int nkeys = 0, i;
@@ -17495,6 +17522,13 @@ sign_apex(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver,
 	inception = now - 3600;	/* Allow for clock skew. */
 	soaexpire = now + dns_zone_getsigvalidityinterval(zone);
 
+	keyexpire = dns_zone_getkeyvalidityinterval(zone);
+	if (keyexpire == 0) {
+		keyexpire = soaexpire;
+	} else {
+		keyexpire += now;
+	}
+
 	check_ksk = DNS_ZONE_OPTION(zone, DNS_ZONEOPT_UPDATECHECKKSK);
 	keyset_kskonly = DNS_ZONE_OPTION(zone, DNS_ZONEOPT_DNSKEYKSKONLY);
 
@@ -17523,7 +17557,7 @@ sign_apex(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver,
 		}
 		result = add_sigs(db, ver, &zone->origin, dns_rdatatype_dnskey,
 				  zonediff->diff, zone_keys, nkeys, zone->mctx,
-				  inception, soaexpire, check_ksk,
+				  inception, keyexpire, check_ksk,
 				  keyset_kskonly);
 		if (result != ISC_R_SUCCESS) {
 			dns_zone_log(zone, ISC_LOG_ERROR,
@@ -17534,8 +17568,8 @@ sign_apex(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver,
 	}
 
 	result = update_sigs(diff, db, ver, zone_keys, nkeys, zone,
-			     inception, soaexpire, now, check_ksk,
-			     keyset_kskonly, zonediff);
+			     inception, soaexpire, keyexpire, now,
+			     check_ksk, keyset_kskonly, zonediff);
 
 	if (result != ISC_R_SUCCESS) {
 		dns_zone_log(zone, ISC_LOG_ERROR,

lib/isccfg/namedconf.c

@@ -2188,6 +2188,9 @@ zone_clauses[] = {
 	{ "sig-validity-interval", &cfg_type_validityinterval,
 		CFG_ZONE_MASTER | CFG_ZONE_SLAVE
 	},
+	{ "dnskey-sig-validity", &cfg_type_uint32,
+		CFG_ZONE_MASTER | CFG_ZONE_SLAVE
+	},
 	{ "transfer-source", &cfg_type_sockaddr4wild,
 		CFG_ZONE_SLAVE | CFG_ZONE_STUB
 	},

util/copyrights

@@ -633,6 +633,7 @@
 ./bin/tests/system/checkconf/bad-acl.conf	CONF-C	2016,2018
 ./bin/tests/system/checkconf/bad-also-notify.conf	CONF-C	2012,2013,2016,2018
 ./bin/tests/system/checkconf/bad-catz-zone.conf	CONF-C	2016,2018
+./bin/tests/system/checkconf/bad-dnskey-validity.conf	CONF-C	2018
 ./bin/tests/system/checkconf/bad-dnssec.conf	CONF-C	2012,2013,2016,2018
 ./bin/tests/system/checkconf/bad-glue-cache-bogus.conf	CONF-C	2017,2018
 ./bin/tests/system/checkconf/bad-hint.conf	CONF-C	2014,2016,2018
@@ -674,6 +675,7 @@
 ./bin/tests/system/checkconf/bad-sharedwritable2.conf	CONF-C	2014,2016,2018
 ./bin/tests/system/checkconf/bad-sharedzone1.conf	CONF-C	2013,2016,2018
 ./bin/tests/system/checkconf/bad-sharedzone2.conf	CONF-C	2013,2016,2018
+./bin/tests/system/checkconf/bad-sig-validity.conf	CONF-C	2018
 ./bin/tests/system/checkconf/bad-tsig.conf	CONF-C	2012,2013,2016,2018
 ./bin/tests/system/checkconf/bad-update-policy1.conf	CONF-C	2018
 ./bin/tests/system/checkconf/bad-update-policy2.conf	CONF-C	2018