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-rw-r--r--src/resolve/resolved-dns-transaction.c161
1 files changed, 100 insertions, 61 deletions
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index 393171a2ad..434eab53e7 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -556,13 +556,76 @@ static bool dns_transaction_dnssec_is_live(DnsTransaction *t) {
return false;
}
+static int dns_transaction_dnssec_ready(DnsTransaction *t) {
+ DnsTransaction *dt;
+ Iterator i;
+
+ assert(t);
+
+ /* Checks whether the auxiliary DNSSEC transactions of our transaction have completed, or are still
+ * ongoing. Returns 0, if we aren't ready for the DNSSEC validation, positive if we are. */
+
+ SET_FOREACH(dt, t->dnssec_transactions, i) {
+
+ switch (dt->state) {
+
+ case DNS_TRANSACTION_NULL:
+ case DNS_TRANSACTION_PENDING:
+ case DNS_TRANSACTION_VALIDATING:
+ /* Still ongoing */
+ return 0;
+
+ case DNS_TRANSACTION_RCODE_FAILURE:
+ if (dt->answer_rcode != DNS_RCODE_NXDOMAIN) {
+ log_debug("Auxiliary DNSSEC RR query failed with rcode=%s.", dns_rcode_to_string(dt->answer_rcode));
+ goto fail;
+ }
+
+ /* Fall-through: NXDOMAIN is good enough for us. This is because some DNS servers erronously
+ * return NXDOMAIN for empty non-terminals (Akamai...), and we need to handle that nicely, when
+ * asking for parent SOA or similar RRs to make unsigned proofs. */
+
+ case DNS_TRANSACTION_SUCCESS:
+ /* All good. */
+ break;
+
+ case DNS_TRANSACTION_DNSSEC_FAILED:
+ /* We handle DNSSEC failures different from other errors, as we care about the DNSSEC
+ * validationr result */
+
+ log_debug("Auxiliary DNSSEC RR query failed validation: %s", dnssec_result_to_string(dt->answer_dnssec_result));
+ t->answer_dnssec_result = dt->answer_dnssec_result; /* Copy error code over */
+ dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED);
+ return 0;
+
+
+ default:
+ log_debug("Auxiliary DNSSEC RR query failed with %s", dns_transaction_state_to_string(dt->state));
+ goto fail;
+ }
+ }
+
+ /* All is ready, we can go and validate */
+ return 1;
+
+fail:
+ t->answer_dnssec_result = DNSSEC_FAILED_AUXILIARY;
+ dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED);
+ return 0;
+}
+
static void dns_transaction_process_dnssec(DnsTransaction *t) {
int r;
assert(t);
/* Are there ongoing DNSSEC transactions? If so, let's wait for them. */
- if (dns_transaction_dnssec_is_live(t))
+ r = dns_transaction_dnssec_ready(t);
+ if (r < 0) {
+ dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES);
+ return;
+ }
+ if (r == 0) /* We aren't ready yet (or one of our auxiliary transactions failed, and we shouldn't validate now */
return;
/* See if we learnt things from the additional DNSSEC transactions, that we didn't know before, and better
@@ -1932,69 +1995,15 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
}
void dns_transaction_notify(DnsTransaction *t, DnsTransaction *source) {
- int r;
-
assert(t);
assert(source);
- if (!IN_SET(t->state, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING))
- return;
+ /* Invoked whenever any of our auxiliary DNSSEC transactions completed its work. If the state is still PENDING,
+ we are still in the loop that adds further DNSSEC transactions, hence don't check if we are ready yet. If
+ the state is VALIDATING however, we should check if we are complete now. */
- /* Invoked whenever any of our auxiliary DNSSEC transactions
- completed its work. We copy any RRs from that transaction
- over into our list of validated keys -- but only if the
- answer is authenticated.
-
- Note that we fail our transaction if the auxiliary
- transaction failed, except on NXDOMAIN. This is because
- some broken DNS servers (Akamai...) will return NXDOMAIN
- for empty non-terminals. */
-
- switch (source->state) {
-
- case DNS_TRANSACTION_DNSSEC_FAILED:
-
- log_debug("Auxiliary DNSSEC RR query failed validation: %s", dnssec_result_to_string(source->answer_dnssec_result));
- t->answer_dnssec_result = source->answer_dnssec_result; /* Copy error code over */
- dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED);
- break;
-
- case DNS_TRANSACTION_RCODE_FAILURE:
-
- if (source->answer_rcode != DNS_RCODE_NXDOMAIN) {
- log_debug("Auxiliary DNSSEC RR query failed with rcode=%i.", source->answer_rcode);
- goto fail;
- }
-
- /* fall-through: NXDOMAIN is good enough for us */
-
- case DNS_TRANSACTION_SUCCESS:
- if (source->answer_authenticated) {
- r = dns_answer_extend(&t->validated_keys, source->answer);
- if (r < 0) {
- log_error_errno(r, "Failed to merge validated DNSSEC key data: %m");
- goto fail;
- }
- }
-
- /* If the state is still PENDING, we are still in the loop
- * that adds further DNSSEC transactions, hence don't check if
- * we are ready yet. If the state is VALIDATING however, we
- * should check if we are complete now. */
- if (t->state == DNS_TRANSACTION_VALIDATING)
- dns_transaction_process_dnssec(t);
- break;
-
- default:
- log_debug("Auxiliary DNSSEC RR query failed with %s", dns_transaction_state_to_string(source->state));
- goto fail;
- }
-
- return;
-
-fail:
- t->answer_dnssec_result = DNSSEC_FAILED_AUXILIARY;
- dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED);
+ if (t->state == DNS_TRANSACTION_VALIDATING)
+ dns_transaction_process_dnssec(t);
}
static int dns_transaction_validate_dnskey_by_ds(DnsTransaction *t) {
@@ -2437,6 +2446,31 @@ static int dns_transaction_invalidate_revoked_keys(DnsTransaction *t) {
return 0;
}
+static int dns_transaction_copy_validated(DnsTransaction *t) {
+ DnsTransaction *dt;
+ Iterator i;
+ int r;
+
+ assert(t);
+
+ /* Copy all validated RRs from the auxiliary DNSSEC transactions into our set of validated RRs */
+
+ SET_FOREACH(dt, t->dnssec_transactions, i) {
+
+ if (DNS_TRANSACTION_IS_LIVE(dt->state))
+ continue;
+
+ if (!dt->answer_authenticated)
+ continue;
+
+ r = dns_answer_extend(&t->validated_keys, dt->answer);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
int dns_transaction_validate_dnssec(DnsTransaction *t) {
_cleanup_(dns_answer_unrefp) DnsAnswer *validated = NULL;
enum {
@@ -2487,13 +2521,18 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
if (r < 0)
return r;
+ /* Third, copy all RRs we acquired successfully from auxiliary RRs over. */
+ r = dns_transaction_copy_validated(t);
+ if (r < 0)
+ return r;
+
/* Second, see if there are DNSKEYs we already know a
* validated DS for. */
r = dns_transaction_validate_dnskey_by_ds(t);
if (r < 0)
return r;
- /* Third, remove all DNSKEY and DS RRs again that our trust
+ /* Fourth, remove all DNSKEY and DS RRs again that our trust
* anchor says are revoked. After all we might have marked
* some keys revoked above, but they might still be lingering
* in our validated_keys list. */