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-rw-r--r--src/resolve/resolved-dns-cache.c17
-rw-r--r--src/resolve/resolved-dns-cache.h2
-rw-r--r--src/resolve/resolved-dns-dnssec.c35
-rw-r--r--src/resolve/resolved-dns-dnssec.h2
-rw-r--r--src/resolve/resolved-dns-transaction.c5
-rw-r--r--src/resolve/resolved-dns-transaction.h1
-rw-r--r--src/resolve/resolved-mdns.c2
7 files changed, 42 insertions, 22 deletions
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index 1c7dd56b3b..301f383809 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -273,13 +273,13 @@ static DnsCacheItem* dns_cache_get(DnsCache *c, DnsResourceRecord *rr) {
return NULL;
}
-static usec_t calculate_until(DnsResourceRecord *rr, usec_t timestamp, bool use_soa_minimum) {
+static usec_t calculate_until(DnsResourceRecord *rr, uint32_t nsec_ttl, usec_t timestamp, bool use_soa_minimum) {
uint32_t ttl;
usec_t u;
assert(rr);
- ttl = rr->ttl;
+ ttl = MIN(rr->ttl, nsec_ttl);
if (rr->key->type == DNS_TYPE_SOA && use_soa_minimum) {
/* If this is a SOA RR, and it is requested, clamp to
* the SOA's minimum field. This is used when we do
@@ -339,7 +339,7 @@ static void dns_cache_item_update_positive(
dns_resource_key_unref(i->key);
i->key = dns_resource_key_ref(rr->key);
- i->until = calculate_until(rr, timestamp, false);
+ i->until = calculate_until(rr, (uint32_t) -1, timestamp, false);
i->authenticated = authenticated;
i->shared_owner = shared_owner;
@@ -420,7 +420,7 @@ static int dns_cache_put_positive(
i->type = DNS_CACHE_POSITIVE;
i->key = dns_resource_key_ref(rr->key);
i->rr = dns_resource_record_ref(rr);
- i->until = calculate_until(rr, timestamp, false);
+ i->until = calculate_until(rr, (uint32_t) -1, timestamp, false);
i->authenticated = authenticated;
i->shared_owner = shared_owner;
i->owner_family = owner_family;
@@ -448,6 +448,7 @@ static int dns_cache_put_negative(
DnsResourceKey *key,
int rcode,
bool authenticated,
+ uint32_t nsec_ttl,
usec_t timestamp,
DnsResourceRecord *soa,
int owner_family,
@@ -470,13 +471,13 @@ static int dns_cache_put_negative(
if (dns_type_is_pseudo(key->type))
return 0;
- if (soa->soa.minimum <= 0 || soa->ttl <= 0) {
+ if (nsec_ttl <= 0 || soa->soa.minimum <= 0 || soa->ttl <= 0) {
if (log_get_max_level() >= LOG_DEBUG) {
r = dns_resource_key_to_string(key, &key_str);
if (r < 0)
return r;
- log_debug("Not caching negative entry with zero SOA TTL: %s", key_str);
+ log_debug("Not caching negative entry with zero SOA/NSEC/NSEC3 TTL: %s", key_str);
}
return 0;
@@ -496,7 +497,7 @@ static int dns_cache_put_negative(
return -ENOMEM;
i->type = rcode == DNS_RCODE_SUCCESS ? DNS_CACHE_NODATA : DNS_CACHE_NXDOMAIN;
- i->until = calculate_until(soa, timestamp, true);
+ i->until = calculate_until(soa, nsec_ttl, timestamp, true);
i->authenticated = authenticated;
i->owner_family = owner_family;
i->owner_address = *owner_address;
@@ -571,6 +572,7 @@ int dns_cache_put(
int rcode,
DnsAnswer *answer,
bool authenticated,
+ uint32_t nsec_ttl,
usec_t timestamp,
int owner_family,
const union in_addr_union *owner_address) {
@@ -669,6 +671,7 @@ int dns_cache_put(
key,
rcode,
authenticated,
+ nsec_ttl,
timestamp,
soa,
owner_family, owner_address);
diff --git a/src/resolve/resolved-dns-cache.h b/src/resolve/resolved-dns-cache.h
index 9c85ca4c58..e61b285df4 100644
--- a/src/resolve/resolved-dns-cache.h
+++ b/src/resolve/resolved-dns-cache.h
@@ -41,7 +41,7 @@ typedef struct DnsCache {
void dns_cache_flush(DnsCache *c);
void dns_cache_prune(DnsCache *c);
-int dns_cache_put(DnsCache *c, DnsResourceKey *key, int rcode, DnsAnswer *answer, bool authenticated, usec_t timestamp, int owner_family, const union in_addr_union *owner_address);
+int dns_cache_put(DnsCache *c, DnsResourceKey *key, int rcode, DnsAnswer *answer, bool authenticated, uint32_t nsec_ttl, usec_t timestamp, int owner_family, const union in_addr_union *owner_address);
int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **answer, bool *authenticated);
int dns_cache_check_conflicts(DnsCache *cache, DnsResourceRecord *rr, int owner_family, const union in_addr_union *owner_address);
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c
index ac2362275c..32d4834aa1 100644
--- a/src/resolve/resolved-dns-dnssec.c
+++ b/src/resolve/resolved-dns-dnssec.c
@@ -40,7 +40,6 @@
* - cname/dname compatibility
* - nxdomain on qname
* - per-interface DNSSEC setting
- * - when doing negative caching, use NSEC/NSEC3 RR instead of SOA for TTL
*
* */
@@ -1250,7 +1249,7 @@ static int nsec3_hashed_domain(DnsResourceRecord *nsec3, const char *domain, con
* that there is no proof either way. The latter is the case if a the proof of non-existence of a given
* name uses an NSEC3 record with the opt-out bit set. Lastly, if we are given insufficient NSEC3 records
* to conclude anything we indicate this by returning NO_RR. */
-static int dnssec_test_nsec3(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated) {
+static int dnssec_test_nsec3(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated, uint32_t *ttl) {
_cleanup_free_ char *next_closer_domain = NULL, *wildcard = NULL, *wildcard_domain = NULL;
const char *zone, *p, *pp = NULL;
DnsResourceRecord *rr, *enclosure_rr, *suffix_rr, *wildcard_rr = NULL;
@@ -1260,7 +1259,6 @@ static int dnssec_test_nsec3(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecR
assert(key);
assert(result);
- assert(authenticated);
/* First step, find the zone name and the NSEC3 parameters of the zone.
* it is sufficient to look for the longest common suffix we find with
@@ -1369,7 +1367,10 @@ found_closest_encloser:
else
*result = DNSSEC_NSEC_NODATA;
- *authenticated = a;
+ if (authenticated)
+ *authenticated = a;
+ if (ttl)
+ *ttl = enclosure_rr->ttl;
return 0;
}
@@ -1452,7 +1453,6 @@ found_closest_encloser:
if (!no_closer) {
*result = DNSSEC_NSEC_NO_RR;
-
return 0;
}
@@ -1488,12 +1488,16 @@ found_closest_encloser:
}
}
- *authenticated = a;
+ if (authenticated)
+ *authenticated = a;
+
+ if (ttl)
+ *ttl = enclosure_rr->ttl;
return 0;
}
-int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated) {
+int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated, uint32_t *ttl) {
DnsResourceRecord *rr;
bool have_nsec3 = false;
DnsAnswerFlags flags;
@@ -1501,7 +1505,6 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
assert(key);
assert(result);
- assert(authenticated);
/* Look for any NSEC/NSEC3 RRs that say something about the specified key. */
@@ -1524,7 +1527,12 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
*result = DNSSEC_NSEC_CNAME;
else
*result = DNSSEC_NSEC_NODATA;
- *authenticated = flags & DNS_ANSWER_AUTHENTICATED;
+
+ if (authenticated)
+ *authenticated = flags & DNS_ANSWER_AUTHENTICATED;
+ if (ttl)
+ *ttl = rr->ttl;
+
return 0;
}
@@ -1533,7 +1541,12 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
return r;
if (r > 0) {
*result = DNSSEC_NSEC_NXDOMAIN;
- *authenticated = flags & DNS_ANSWER_AUTHENTICATED;
+
+ if (authenticated)
+ *authenticated = flags & DNS_ANSWER_AUTHENTICATED;
+ if (ttl)
+ *ttl = rr->ttl;
+
return 0;
}
break;
@@ -1546,7 +1559,7 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
/* OK, this was not sufficient. Let's see if NSEC3 can help. */
if (have_nsec3)
- return dnssec_test_nsec3(answer, key, result, authenticated);
+ return dnssec_test_nsec3(answer, key, result, authenticated, ttl);
/* No approproate NSEC RR found, report this. */
*result = DNSSEC_NSEC_NO_RR;
diff --git a/src/resolve/resolved-dns-dnssec.h b/src/resolve/resolved-dns-dnssec.h
index df377c8016..94d0b23f80 100644
--- a/src/resolve/resolved-dns-dnssec.h
+++ b/src/resolve/resolved-dns-dnssec.h
@@ -99,7 +99,7 @@ typedef enum DnssecNsecResult {
DNSSEC_NSEC_OPTOUT,
} DnssecNsecResult;
-int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated);
+int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated, uint32_t *ttl);
const char* dnssec_mode_to_string(DnssecMode m) _const_;
DnssecMode dnssec_mode_from_string(const char *s) _pure_;
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index 677d643463..870b7586fd 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -40,6 +40,7 @@ static void dns_transaction_reset_answer(DnsTransaction *t) {
t->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID;
t->answer_authenticated = false;
+ t->answer_nsec_ttl = (uint32_t) -1;
}
static void dns_transaction_close_connection(DnsTransaction *t) {
@@ -157,6 +158,7 @@ int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key)
t->dns_udp_fd = -1;
t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID;
t->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
+ t->answer_nsec_ttl = (uint32_t) -1;
t->key = dns_resource_key_ref(key);
/* Find a fresh, unused transaction id */
@@ -482,6 +484,7 @@ static void dns_transaction_cache_answer(DnsTransaction *t) {
t->answer_rcode,
t->answer,
t->answer_authenticated,
+ t->answer_nsec_ttl,
0,
t->received->family,
&t->received->sender);
@@ -2385,7 +2388,7 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
bool authenticated = false;
/* Bummer! Let's check NSEC/NSEC3 */
- r = dnssec_test_nsec(t->answer, t->key, &nr, &authenticated);
+ r = dnssec_test_nsec(t->answer, t->key, &nr, &authenticated, &t->answer_nsec_ttl);
if (r < 0)
return r;
diff --git a/src/resolve/resolved-dns-transaction.h b/src/resolve/resolved-dns-transaction.h
index e0f29d95e7..ede33f9547 100644
--- a/src/resolve/resolved-dns-transaction.h
+++ b/src/resolve/resolved-dns-transaction.h
@@ -81,6 +81,7 @@ struct DnsTransaction {
int answer_rcode;
DnssecResult answer_dnssec_result;
DnsTransactionSource answer_source;
+ uint32_t answer_nsec_ttl;
/* Indicates whether the primary answer is authenticated,
* i.e. whether the RRs from answer which directly match the
diff --git a/src/resolve/resolved-mdns.c b/src/resolve/resolved-mdns.c
index db23bc9d42..7c1012f4ea 100644
--- a/src/resolve/resolved-mdns.c
+++ b/src/resolve/resolved-mdns.c
@@ -122,7 +122,7 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us
dns_transaction_process_reply(t, p);
}
- dns_cache_put(&scope->cache, NULL, DNS_PACKET_RCODE(p), p->answer, false, 0, p->family, &p->sender);
+ dns_cache_put(&scope->cache, NULL, DNS_PACKET_RCODE(p), p->answer, false, (uint32_t) -1, 0, p->family, &p->sender);
} else if (dns_packet_validate_query(p) > 0) {
log_debug("Got mDNS query packet for id %u", DNS_PACKET_ID(p));
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-11 07:51:53 +0000