summaryrefslogtreecommitdiff
path: root/src/resolve/resolved-dns-transaction.c
diff options
context:
space:
mode:
authorLennart Poettering <lennart@poettering.net>2015-12-24 14:08:22 +0100
committerLennart Poettering <lennart@poettering.net>2015-12-26 19:09:10 +0100
commitb63fca62453969f816c687ac4cf438d5cefa4552 (patch)
tree1e04c756a258560226ddaca585d4e103783d61b4 /src/resolve/resolved-dns-transaction.c
parentf61dfddbff4c826bfcbca7b413674770546fa527 (diff)
resolved: deal with unsigned DS/NSEC/NSEC3 properly
Previously, we'd insist on an RRSIG for all DS/NSEC/NSEC3 RRs. With this change we don't do that anymore, but also allow unsigned DS/NSEC/NSEC3 if we can prove that the zone they are located in is unsigned.
Diffstat (limited to 'src/resolve/resolved-dns-transaction.c')
-rw-r--r--src/resolve/resolved-dns-transaction.c49
1 files changed, 23 insertions, 26 deletions
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index f138d55ad8..323e45b36f 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -1325,7 +1325,7 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
* - For RRSIG we get the matching DNSKEY
* - For DNSKEY we get the matching DS
* - For unsigned SOA/NS we get the matching DS
- * - For unsigned CNAME/DNAME we get the parent SOA RR
+ * - For unsigned CNAME/DNAME/DS we get the parent SOA RR
* - For other unsigned RRs we get the matching SOA RR
* - For SOA/NS/DS queries with no matching response RRs, and no NSEC/NSEC3, the parent's SOA RR
* - For other queries with no matching response RRs, and no NSEC/NSEC3, the SOA RR
@@ -1414,15 +1414,6 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
break;
}
- case DNS_TYPE_DS:
- case DNS_TYPE_NSEC:
- case DNS_TYPE_NSEC3:
- /* Don't acquire anything for
- * DS/NSEC/NSEC3. We require they come with an
- * RRSIG without us asking for anything, and
- * that's sufficient. */
- break;
-
case DNS_TYPE_SOA:
case DNS_TYPE_NS: {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *ds = NULL;
@@ -1458,6 +1449,7 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
break;
}
+ case DNS_TYPE_DS:
case DNS_TYPE_CNAME:
case DNS_TYPE_DNAME: {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *soa = NULL;
@@ -1468,7 +1460,10 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
* unsigned CNAME/DNAME RRs, maybe that's the
* apex. But do all that only if this is
* actually a response to our original
- * question. */
+ * question.
+ *
+ * Similar for DS RRs, which are signed when
+ * the parent SOA is signed. */
r = dns_transaction_is_primary_response(t, rr);
if (r < 0)
@@ -1493,7 +1488,7 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
if (!soa)
return -ENOMEM;
- log_debug("Requesting parent SOA to validate transaction %" PRIu16 " (%s, unsigned CNAME/DNAME RRset).", t->id, DNS_RESOURCE_KEY_NAME(rr->key));
+ log_debug("Requesting parent SOA to validate transaction %" PRIu16 " (%s, unsigned CNAME/DNAME/DS RRset).", t->id, DNS_RESOURCE_KEY_NAME(rr->key));
r = dns_transaction_request_dnssec_rr(t, soa);
if (r < 0)
return r;
@@ -1504,10 +1499,11 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
default: {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *soa = NULL;
- /* For other unsigned RRsets, look for proof
- * the zone is unsigned, by requesting the SOA
- * RR of the zone. However, do so only if they
- * are directly relevant to our original
+ /* For other unsigned RRsets (including
+ * NSEC/NSEC3!), look for proof the zone is
+ * unsigned, by requesting the SOA RR of the
+ * zone. However, do so only if they are
+ * directly relevant to our original
* question. */
r = dns_transaction_is_primary_response(t, rr);
@@ -1689,13 +1685,6 @@ static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *
switch (rr->key->type) {
- case DNS_TYPE_DNSKEY:
- case DNS_TYPE_DS:
- case DNS_TYPE_NSEC:
- case DNS_TYPE_NSEC3:
- /* We never consider DNSKEY, DS, NSEC, NSEC3 RRs if they aren't signed. */
- return true;
-
case DNS_TYPE_RRSIG:
/* RRSIGs are the signatures themselves, they need no signing. */
return false;
@@ -1705,7 +1694,7 @@ static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *
DnsTransaction *dt;
Iterator i;
- /* For SOA or NS RRs we look for a matching DS transaction, or a SOA transaction of the parent */
+ /* For SOA or NS RRs we look for a matching DS transaction */
SET_FOREACH(dt, t->dnssec_transactions, i) {
@@ -1736,13 +1725,18 @@ static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *
return true;
}
+ case DNS_TYPE_DS:
case DNS_TYPE_CNAME:
case DNS_TYPE_DNAME: {
const char *parent = NULL;
DnsTransaction *dt;
Iterator i;
- /* CNAME/DNAME RRs cannot be located at a zone apex, hence look directly for the parent SOA. */
+ /*
+ * CNAME/DNAME RRs cannot be located at a zone apex, hence look directly for the parent SOA.
+ *
+ * DS RRs are signed if the parent is signed, hence also look at the parent SOA
+ */
SET_FOREACH(dt, t->dnssec_transactions, i) {
@@ -1757,6 +1751,9 @@ static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *
if (r < 0)
return r;
if (r == 0) {
+ if (rr->key->type == DNS_TYPE_DS)
+ return true;
+
/* A CNAME/DNAME without a parent? That's sooo weird. */
log_debug("Transaction %" PRIu16 " claims CNAME/DNAME at root. Refusing.", t->id);
return -EBADMSG;
@@ -1779,7 +1776,7 @@ static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *
DnsTransaction *dt;
Iterator i;
- /* Any other kind of RR. Let's see if our SOA lookup was authenticated */
+ /* Any other kind of RR (including DNSKEY/NSEC/NSEC3). Let's see if our SOA lookup was authenticated */
SET_FOREACH(dt, t->dnssec_transactions, i) {