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-rw-r--r--src/resolve/dns-type.c2
-rw-r--r--src/resolve/dns-type.h2
-rw-r--r--src/resolve/resolved-bus.c3
-rw-r--r--src/resolve/resolved-dns-answer.c331
-rw-r--r--src/resolve/resolved-dns-answer.h31
-rw-r--r--src/resolve/resolved-dns-cache.c33
-rw-r--r--src/resolve/resolved-dns-dnssec.c96
-rw-r--r--src/resolve/resolved-dns-dnssec.h17
-rw-r--r--src/resolve/resolved-dns-packet.c54
-rw-r--r--src/resolve/resolved-dns-packet.h3
-rw-r--r--src/resolve/resolved-dns-query.c67
-rw-r--r--src/resolve/resolved-dns-query.h2
-rw-r--r--src/resolve/resolved-dns-rr.c31
-rw-r--r--src/resolve/resolved-dns-rr.h3
-rw-r--r--src/resolve/resolved-dns-scope.c10
-rw-r--r--src/resolve/resolved-dns-transaction.c553
-rw-r--r--src/resolve/resolved-dns-transaction.h29
-rw-r--r--src/resolve/resolved-dns-zone.c12
-rw-r--r--src/resolve/resolved-dns-zone.h2
-rw-r--r--src/resolve/resolved-mdns.c12
-rw-r--r--src/resolve/test-dnssec.c4
21 files changed, 1077 insertions, 220 deletions
diff --git a/src/resolve/dns-type.c b/src/resolve/dns-type.c
index 63b4b36e88..a626ecf01a 100644
--- a/src/resolve/dns-type.c
+++ b/src/resolve/dns-type.c
@@ -45,6 +45,6 @@ int dns_type_from_string(const char *s) {
}
/* XXX: find an authoritative list of all pseudo types? */
-bool dns_type_is_pseudo(int n) {
+bool dns_type_is_pseudo(uint16_t n) {
return IN_SET(n, DNS_TYPE_ANY, DNS_TYPE_AXFR, DNS_TYPE_IXFR, DNS_TYPE_OPT);
}
diff --git a/src/resolve/dns-type.h b/src/resolve/dns-type.h
index 950af36ee3..2868025ad7 100644
--- a/src/resolve/dns-type.h
+++ b/src/resolve/dns-type.h
@@ -25,7 +25,7 @@
const char *dns_type_to_string(int type);
int dns_type_from_string(const char *s);
-bool dns_type_is_pseudo(int n);
+bool dns_type_is_pseudo(uint16_t n);
/* DNS record types, taken from
* http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml.
diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c
index 0ceca56371..1427638233 100644
--- a/src/resolve/resolved-bus.c
+++ b/src/resolve/resolved-bus.c
@@ -60,6 +60,9 @@ static int reply_query_state(DnsQuery *q) {
case DNS_TRANSACTION_ABORTED:
return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "Query aborted");
+ case DNS_TRANSACTION_DNSSEC_FAILED:
+ return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "DNSSEC validation failed");
+
case DNS_TRANSACTION_FAILURE: {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
diff --git a/src/resolve/resolved-dns-answer.c b/src/resolve/resolved-dns-answer.c
index 4db67f7278..de8c4d9dd3 100644
--- a/src/resolve/resolved-dns-answer.c
+++ b/src/resolve/resolved-dns-answer.c
@@ -46,6 +46,18 @@ DnsAnswer *dns_answer_ref(DnsAnswer *a) {
return a;
}
+static void dns_answer_flush(DnsAnswer *a) {
+ DnsResourceRecord *rr;
+
+ if (!a)
+ return;
+
+ DNS_ANSWER_FOREACH(rr, a)
+ dns_resource_record_unref(rr);
+
+ a->n_rrs = 0;
+}
+
DnsAnswer *dns_answer_unref(DnsAnswer *a) {
if (!a)
return NULL;
@@ -53,11 +65,7 @@ DnsAnswer *dns_answer_unref(DnsAnswer *a) {
assert(a->n_ref > 0);
if (a->n_ref == 1) {
- unsigned i;
-
- for (i = 0; i < a->n_rrs; i++)
- dns_resource_record_unref(a->items[i].rr);
-
+ dns_answer_flush(a);
free(a);
} else
a->n_ref--;
@@ -65,6 +73,35 @@ DnsAnswer *dns_answer_unref(DnsAnswer *a) {
return NULL;
}
+static int dns_answer_add_raw(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
+ assert(rr);
+
+ if (!a)
+ return -ENOSPC;
+
+ if (a->n_rrs >= a->n_allocated)
+ return -ENOSPC;
+
+ a->items[a->n_rrs].rr = dns_resource_record_ref(rr);
+ a->items[a->n_rrs].ifindex = ifindex;
+ a->n_rrs++;
+
+ return 1;
+}
+
+static int dns_answer_add_raw_all(DnsAnswer *a, DnsAnswer *source) {
+ DnsResourceRecord *rr;
+ int ifindex, r;
+
+ DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, source) {
+ r = dns_answer_add_raw(a, rr, ifindex);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
unsigned i;
int r;
@@ -73,6 +110,8 @@ int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
if (!a)
return -ENOSPC;
+ if (a->n_ref > 1)
+ return -EBUSY;
for (i = 0; i < a->n_rrs; i++) {
if (a->items[i].ifindex != ifindex)
@@ -95,14 +134,33 @@ int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
}
}
- if (a->n_rrs >= a->n_allocated)
- return -ENOSPC;
+ return dns_answer_add_raw(a, rr, ifindex);
+}
- a->items[a->n_rrs].rr = dns_resource_record_ref(rr);
- a->items[a->n_rrs].ifindex = ifindex;
- a->n_rrs++;
+static int dns_answer_add_all(DnsAnswer *a, DnsAnswer *b) {
+ DnsResourceRecord *rr;
+ int ifindex, r;
- return 1;
+ DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, b) {
+ r = dns_answer_add(a, rr, ifindex);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex) {
+ int r;
+
+ assert(a);
+ assert(rr);
+
+ r = dns_answer_reserve_or_clone(a, 1);
+ if (r < 0)
+ return r;
+
+ return dns_answer_add(*a, rr, ifindex);
}
int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) {
@@ -131,8 +189,8 @@ int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) {
return dns_answer_add(a, soa, 0);
}
-int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) {
- unsigned i;
+int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key) {
+ DnsResourceRecord *i;
int r;
assert(key);
@@ -140,8 +198,8 @@ int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) {
if (!a)
return 0;
- for (i = 0; i < a->n_rrs; i++) {
- r = dns_resource_key_match_rr(key, a->items[i].rr, NULL);
+ DNS_ANSWER_FOREACH(i, a) {
+ r = dns_resource_key_match_rr(key, i, NULL);
if (r < 0)
return r;
if (r > 0)
@@ -151,21 +209,25 @@ int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) {
return 0;
}
-int dns_answer_match_soa(DnsResourceKey *key, DnsResourceKey *soa) {
- if (soa->class != DNS_CLASS_IN)
- return 0;
+int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr) {
+ DnsResourceRecord *i;
+ int r;
- if (soa->type != DNS_TYPE_SOA)
- return 0;
+ assert(rr);
- if (!dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(soa)))
- return 0;
+ DNS_ANSWER_FOREACH(i, a) {
+ r = dns_resource_record_equal(i, rr);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return 1;
+ }
- return 1;
+ return 0;
}
-int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **ret) {
- unsigned i;
+int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret) {
+ DnsResourceRecord *rr;
assert(key);
assert(ret);
@@ -177,10 +239,9 @@ int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **r
if (key->type == DNS_TYPE_SOA)
return 0;
- for (i = 0; i < a->n_rrs; i++) {
-
- if (dns_answer_match_soa(key, a->items[i].rr->key)) {
- *ret = a->items[i].rr;
+ DNS_ANSWER_FOREACH(rr, a) {
+ if (dns_resource_key_match_soa(key, rr->key)) {
+ *ret = rr;
return 1;
}
}
@@ -188,41 +249,169 @@ int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **r
return 0;
}
-DnsAnswer *dns_answer_merge(DnsAnswer *a, DnsAnswer *b) {
- _cleanup_(dns_answer_unrefp) DnsAnswer *ret = NULL;
- DnsAnswer *k;
+int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret) {
+ _cleanup_(dns_answer_unrefp) DnsAnswer *k = NULL;
+ int r;
+
+ assert(ret);
+
+ if (dns_answer_size(a) <= 0) {
+ *ret = dns_answer_ref(b);
+ return 0;
+ }
+
+ if (dns_answer_size(b) <= 0) {
+ *ret = dns_answer_ref(a);
+ return 0;
+ }
+
+ k = dns_answer_new(a->n_rrs + b->n_rrs);
+ if (!k)
+ return -ENOMEM;
+
+ r = dns_answer_add_raw_all(k, a);
+ if (r < 0)
+ return r;
+
+ r = dns_answer_add_all(k, b);
+ if (r < 0)
+ return r;
+
+ *ret = k;
+ k = NULL;
+
+ return 0;
+}
+
+int dns_answer_extend(DnsAnswer **a, DnsAnswer *b) {
+ DnsAnswer *merged;
+ int r;
+
+ assert(a);
+
+ r = dns_answer_merge(*a, b, &merged);
+ if (r < 0)
+ return r;
+
+ dns_answer_unref(*a);
+ *a = merged;
+
+ return 0;
+}
+
+int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key) {
+ bool found = false, other = false;
+ DnsResourceRecord *rr;
unsigned i;
int r;
- if (a && (!b || b->n_rrs <= 0))
- return dns_answer_ref(a);
- if ((!a || a->n_rrs <= 0) && b)
- return dns_answer_ref(b);
+ assert(a);
+ assert(key);
- ret = dns_answer_new((a ? a->n_rrs : 0) + (b ? b->n_rrs : 0));
- if (!ret)
- return NULL;
+ /* Remove all entries matching the specified key from *a */
- if (a) {
- for (i = 0; i < a->n_rrs; i++) {
- r = dns_answer_add(ret, a->items[i].rr, a->items[i].ifindex);
- if (r < 0)
- return NULL;
- }
+ DNS_ANSWER_FOREACH(rr, *a) {
+ r = dns_resource_key_equal(rr->key, key);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ found = true;
+ else
+ other = true;
+
+ if (found && other)
+ break;
+ }
+
+ if (!found)
+ return 0;
+
+ if (!other) {
+ *a = dns_answer_unref(*a); /* Return NULL for the empty answer */
+ return 1;
}
- if (b) {
- for (i = 0; i < b->n_rrs; i++) {
- r = dns_answer_add(ret, b->items[i].rr, b->items[i].ifindex);
+ if ((*a)->n_ref > 1) {
+ _cleanup_(dns_answer_unrefp) DnsAnswer *copy = NULL;
+ int ifindex;
+
+ copy = dns_answer_new((*a)->n_rrs);
+ if (!copy)
+ return -ENOMEM;
+
+ DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, *a) {
+ r = dns_resource_key_equal(rr->key, key);
if (r < 0)
- return NULL;
+ return r;
+ if (r > 0)
+ continue;
+
+ r = dns_answer_add_raw(copy, rr, ifindex);
+ if (r < 0)
+ return r;
}
+
+ dns_answer_unref(*a);
+ *a = copy;
+ copy = NULL;
+
+ return 1;
}
- k = ret;
- ret = NULL;
+ /* Only a single reference, edit in-place */
+
+ i = 0;
+ for (;;) {
+ if (i >= (*a)->n_rrs)
+ break;
- return k;
+ r = dns_resource_key_equal((*a)->items[i].rr->key, key);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ /* Kill this entry */
+
+ dns_resource_record_unref((*a)->items[i].rr);
+ memmove((*a)->items + i, (*a)->items + i + 1, sizeof(DnsAnswerItem) * ((*a)->n_rrs - i - 1));
+ (*a)->n_rrs --;
+ continue;
+
+ } else
+ /* Keep this entry */
+ i++;
+ }
+
+ return 1;
+}
+
+int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key) {
+ DnsResourceRecord *rr_source;
+ int ifindex_source, r;
+
+ assert(a);
+ assert(key);
+
+ /* Copy all RRs matching the specified key from source into *a */
+
+ DNS_ANSWER_FOREACH_IFINDEX(rr_source, ifindex_source, source) {
+
+ r = dns_resource_key_equal(rr_source->key, key);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ /* Make space for at least one entry */
+ r = dns_answer_reserve_or_clone(a, 1);
+ if (r < 0)
+ return r;
+
+ r = dns_answer_add(*a, rr_source, ifindex_source);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
}
void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) {
@@ -261,6 +450,8 @@ void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) {
int dns_answer_reserve(DnsAnswer **a, unsigned n_free) {
DnsAnswer *n;
+ assert(a);
+
if (n_free <= 0)
return 0;
@@ -275,6 +466,9 @@ int dns_answer_reserve(DnsAnswer **a, unsigned n_free) {
if ((*a)->n_allocated >= ns)
return 0;
+ /* Allocate more than we need */
+ ns *= 2;
+
n = realloc(*a, offsetof(DnsAnswer, items) + sizeof(DnsAnswerItem) * ns);
if (!n)
return -ENOMEM;
@@ -289,3 +483,36 @@ int dns_answer_reserve(DnsAnswer **a, unsigned n_free) {
*a = n;
return 0;
}
+
+int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free) {
+ _cleanup_(dns_answer_unrefp) DnsAnswer *n = NULL;
+ int r;
+
+ assert(a);
+
+ /* Tries to extend the DnsAnswer object. And if that's not
+ * possibly, since we are not the sole owner, then allocate a
+ * new, appropriately sized one. Either way, after this call
+ * the object will only have a single reference, and has room
+ * for at least the specified number of RRs. */
+
+ r = dns_answer_reserve(a, n_free);
+ if (r != -EBUSY)
+ return r;
+
+ assert(*a);
+
+ n = dns_answer_new(((*a)->n_rrs + n_free) * 2);
+ if (!n)
+ return -ENOMEM;
+
+ r = dns_answer_add_raw_all(n, *a);
+ if (r < 0)
+ return r;
+
+ dns_answer_unref(*a);
+ *a = n;
+ n = NULL;
+
+ return 0;
+}
diff --git a/src/resolve/resolved-dns-answer.h b/src/resolve/resolved-dns-answer.h
index 89c254b02e..8d95131dbe 100644
--- a/src/resolve/resolved-dns-answer.h
+++ b/src/resolve/resolved-dns-answer.h
@@ -30,7 +30,9 @@ typedef struct DnsAnswerItem DnsAnswerItem;
/* A simple array of resource records. We keep track of the
* originating ifindex for each RR where that makes sense, so that we
* can qualify A and AAAA RRs referring to a local link with the
- * right ifindex. */
+ * right ifindex.
+ *
+ * Note that we usually encode the empty answer as a simple NULL. */
struct DnsAnswerItem {
DnsResourceRecord *rr;
@@ -48,15 +50,28 @@ DnsAnswer *dns_answer_ref(DnsAnswer *a);
DnsAnswer *dns_answer_unref(DnsAnswer *a);
int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex);
+int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex);
int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl);
-int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key);
-int dns_answer_match_soa(DnsResourceKey *key, DnsResourceKey *soa);
-int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **ret);
-DnsAnswer *dns_answer_merge(DnsAnswer *a, DnsAnswer *b);
+int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key);
+int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr);
+
+int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret);
+
+int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret);
+int dns_answer_extend(DnsAnswer **a, DnsAnswer *b);
+
void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local);
int dns_answer_reserve(DnsAnswer **a, unsigned n_free);
+int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free);
+
+int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key);
+int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key);
+
+static inline unsigned dns_answer_size(DnsAnswer *a) {
+ return a ? a->n_rrs : 0;
+}
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
@@ -70,13 +85,13 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
#define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a)
-#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifindex, a) \
+#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifi, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
- (ifindex) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
+ (ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
- UNIQ_T(i, q)++, (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), (ifindex) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0))
+ UNIQ_T(i, q)++, (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), (ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0))
#define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a)
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index 1774ae6cb8..4aacc268e2 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -473,15 +473,15 @@ int dns_cache_put(
return 0;
/* Third, add in negative entries if the key has no RR */
- r = dns_answer_contains(answer, key);
+ r = dns_answer_match_key(answer, key);
if (r < 0)
goto fail;
if (r > 0)
return 0;
- /* See https://tools.ietf.org/html/rfc2308, which
- * say that a matching SOA record in the packet
- * is used to to enable negative caching. */
+ /* See https://tools.ietf.org/html/rfc2308, which say that a
+ * matching SOA record in the packet is used to to enable
+ * negative caching. */
r = dns_answer_find_soa(answer, key, &soa);
if (r < 0)
@@ -489,31 +489,6 @@ int dns_cache_put(
if (r == 0)
return 0;
- /* Also, if the requested key is an alias, the negative response should
- be cached for each name in the redirect chain. Any CNAME record in
- the response is from the redirection chain, though only the final one
- is guaranteed to be included. This means that we cannot verify the
- chain and that we need to cache them all as it may be incomplete. */
- for (i = 0; i < answer->n_rrs; i++) {
- DnsResourceRecord *answer_rr = answer->items[i].rr;
-
- if (answer_rr->key->type == DNS_TYPE_CNAME) {
- _cleanup_(dns_resource_key_unrefp) DnsResourceKey *canonical_key = NULL;
-
- canonical_key = dns_resource_key_new_redirect(key, answer_rr);
- if (!canonical_key)
- goto fail;
-
- /* Let's not add negative cache entries for records outside the current zone. */
- if (!dns_answer_match_soa(canonical_key, soa->key))
- continue;
-
- r = dns_cache_put_negative(c, canonical_key, rcode, authenticated, timestamp, MIN(soa->soa.minimum, soa->ttl), owner_family, owner_address);
- if (r < 0)
- goto fail;
- }
- }
-
r = dns_cache_put_negative(c, key, rcode, authenticated, timestamp, MIN(soa->soa.minimum, soa->ttl), owner_family, owner_address);
if (r < 0)
goto fail;
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c
index 2d06775dca..df12e86167 100644
--- a/src/resolve/resolved-dns-dnssec.c
+++ b/src/resolve/resolved-dns-dnssec.c
@@ -40,7 +40,7 @@
* - Make trust anchor store read additional DS+DNSKEY data from disk
* - wildcard zones compatibility
* - multi-label zone compatibility
- * - DMSSEC cname/dname compatibility
+ * - DNSSEC cname/dname compatibility
* - per-interface DNSSEC setting
* - DSA support
* - EC support?
@@ -193,11 +193,12 @@ static int dnssec_rsa_verify(
}
ge = gcry_pk_verify(signature_sexp, data_sexp, public_key_sexp);
- if (ge == GPG_ERR_BAD_SIGNATURE)
+ if (gpg_err_code(ge) == GPG_ERR_BAD_SIGNATURE)
r = 0;
- else if (ge != 0)
+ else if (ge != 0) {
+ log_debug("RSA signature check failed: %s", gpg_strerror(ge));
r = -EIO;
- else
+ } else
r = 1;
finish:
@@ -272,7 +273,8 @@ int dnssec_verify_rrset(
DnsResourceKey *key,
DnsResourceRecord *rrsig,
DnsResourceRecord *dnskey,
- usec_t realtime) {
+ usec_t realtime,
+ DnssecResult *result) {
uint8_t wire_format_name[DNS_WIRE_FOMAT_HOSTNAME_MAX];
size_t exponent_size, modulus_size, hash_size;
@@ -285,6 +287,7 @@ int dnssec_verify_rrset(
assert(key);
assert(rrsig);
assert(dnskey);
+ assert(result);
assert(rrsig->key->type == DNS_TYPE_RRSIG);
assert(dnskey->key->type == DNS_TYPE_DNSKEY);
@@ -301,8 +304,10 @@ int dnssec_verify_rrset(
r = dnssec_rrsig_expired(rrsig, realtime);
if (r < 0)
return r;
- if (r > 0)
- return DNSSEC_SIGNATURE_EXPIRED;
+ if (r > 0) {
+ *result = DNSSEC_SIGNATURE_EXPIRED;
+ return 0;
+ }
/* Collect all relevant RRs in a single array, so that we can look at the RRset */
list = newa(DnsResourceRecord *, a->n_rrs);
@@ -326,7 +331,7 @@ int dnssec_verify_rrset(
return -ENODATA;
/* Bring the RRs into canonical order */
- qsort_safe(list, n, sizeof(DnsResourceRecord), rr_compare);
+ qsort_safe(list, n, sizeof(DnsResourceRecord*), rr_compare);
/* OK, the RRs are now in canonical order. Let's calculate the digest */
switch (rrsig->rrsig.algorithm) {
@@ -444,7 +449,8 @@ int dnssec_verify_rrset(
if (r < 0)
goto finish;
- r = r ? DNSSEC_VERIFIED : DNSSEC_INVALID;
+ *result = r ? DNSSEC_VALIDATED : DNSSEC_INVALID;
+ r = 0;
finish:
gcry_md_close(md);
@@ -476,7 +482,7 @@ int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnske
if (dnssec_keytag(dnskey) != rrsig->rrsig.key_tag)
return 0;
- return dns_name_equal(DNS_RESOURCE_KEY_NAME(dnskey->key), DNS_RESOURCE_KEY_NAME(rrsig->key));
+ return dns_name_equal(DNS_RESOURCE_KEY_NAME(dnskey->key), rrsig->rrsig.signer);
}
int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig) {
@@ -499,15 +505,17 @@ int dnssec_verify_rrset_search(
DnsAnswer *a,
DnsResourceKey *key,
DnsAnswer *validated_dnskeys,
- usec_t realtime) {
+ usec_t realtime,
+ DnssecResult *result) {
bool found_rrsig = false, found_dnskey = false;
DnsResourceRecord *rrsig;
int r;
assert(key);
+ assert(result);
- /* Verifies all RRs from "a" that match the key "key", against DNSKEY RRs in "validated_dnskeys" */
+ /* Verifies all RRs from "a" that match the key "key", against DNSKEY and DS RRs in "validated_dnskeys" */
if (!a || a->n_rrs <= 0)
return -ENODATA;
@@ -524,7 +532,9 @@ int dnssec_verify_rrset_search(
found_rrsig = true;
+ /* Look for a matching key */
DNS_ANSWER_FOREACH(dnskey, validated_dnskeys) {
+ DnssecResult one_result;
r = dnssec_rrsig_match_dnskey(rrsig, dnskey);
if (r < 0)
@@ -545,11 +555,13 @@ int dnssec_verify_rrset_search(
* the RRSet against the RRSIG and DNSKEY
* combination. */
- r = dnssec_verify_rrset(a, key, rrsig, dnskey, realtime);
+ r = dnssec_verify_rrset(a, key, rrsig, dnskey, realtime, &one_result);
if (r < 0 && r != EOPNOTSUPP)
return r;
- if (r == DNSSEC_VERIFIED)
- return DNSSEC_VERIFIED;
+ if (one_result == DNSSEC_VALIDATED) {
+ *result = DNSSEC_VALIDATED;
+ return 0;
+ }
/* If the signature is invalid, or done using
an unsupported algorithm, let's try another
@@ -560,12 +572,13 @@ int dnssec_verify_rrset_search(
}
if (found_dnskey)
- return DNSSEC_INVALID;
-
- if (found_rrsig)
- return DNSSEC_MISSING_KEY;
+ *result = DNSSEC_INVALID;
+ else if (found_rrsig)
+ *result = DNSSEC_MISSING_KEY;
+ else
+ *result = DNSSEC_NO_SIGNATURE;
- return DNSSEC_NO_SIGNATURE;
+ return 0;
}
int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max) {
@@ -653,16 +666,14 @@ int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds) {
if (dnskey->dnskey.protocol != 3)
return -EKEYREJECTED;
- if (!dnssec_algorithm_supported(dnskey->dnskey.algorithm))
- return -EOPNOTSUPP;
- if (!dnssec_digest_supported(ds->ds.digest_type))
- return -EOPNOTSUPP;
-
if (dnskey->dnskey.algorithm != ds->ds.algorithm)
return 0;
if (dnssec_keytag(dnskey) != ds->ds.key_tag)
return 0;
+ if (!dnssec_digest_supported(ds->ds.digest_type))
+ return -EOPNOTSUPP;
+
switch (ds->ds.digest_type) {
case DNSSEC_DIGEST_SHA1:
@@ -711,9 +722,44 @@ finish:
return r;
}
+int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds) {
+ DnsResourceRecord *ds;
+ int r;
+
+ assert(dnskey);
+
+ if (dnskey->key->type != DNS_TYPE_DNSKEY)
+ return 0;
+
+ DNS_ANSWER_FOREACH(ds, validated_ds) {
+
+ if (ds->key->type != DNS_TYPE_DS)
+ continue;
+
+ r = dnssec_verify_dnskey(dnskey, ds);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return 1;
+ }
+
+ return 0;
+}
+
static const char* const dnssec_mode_table[_DNSSEC_MODE_MAX] = {
[DNSSEC_NO] = "no",
[DNSSEC_TRUST] = "trust",
[DNSSEC_YES] = "yes",
};
DEFINE_STRING_TABLE_LOOKUP(dnssec_mode, DnssecMode);
+
+static const char* const dnssec_result_table[_DNSSEC_RESULT_MAX] = {
+ [DNSSEC_VALIDATED] = "validated",
+ [DNSSEC_INVALID] = "invalid",
+ [DNSSEC_UNSIGNED] = "unsigned",
+ [DNSSEC_NO_SIGNATURE] = "no-signature",
+ [DNSSEC_MISSING_KEY] = "missing-key",
+ [DNSSEC_SIGNATURE_EXPIRED] = "signature-expired",
+ [DNSSEC_FAILED_AUXILIARY] = "failed-auxiliary",
+};
+DEFINE_STRING_TABLE_LOOKUP(dnssec_result, DnssecResult);
diff --git a/src/resolve/resolved-dns-dnssec.h b/src/resolve/resolved-dns-dnssec.h
index f4cb58988a..f0825ba23f 100644
--- a/src/resolve/resolved-dns-dnssec.h
+++ b/src/resolve/resolved-dns-dnssec.h
@@ -22,6 +22,7 @@
***/
typedef enum DnssecMode DnssecMode;
+typedef enum DnssecResult DnssecResult;
#include "dns-domain.h"
#include "resolved-dns-answer.h"
@@ -41,12 +42,16 @@ enum DnssecMode {
_DNSSEC_MODE_INVALID = -1
};
-enum {
- DNSSEC_VERIFIED,
+enum DnssecResult {
+ DNSSEC_VALIDATED,
DNSSEC_INVALID,
+ DNSSEC_UNSIGNED,
DNSSEC_NO_SIGNATURE,
DNSSEC_MISSING_KEY,
DNSSEC_SIGNATURE_EXPIRED,
+ DNSSEC_FAILED_AUXILIARY,
+ _DNSSEC_RESULT_MAX,
+ _DNSSEC_RESULT_INVALID = -1
};
#define DNSSEC_CANONICAL_HOSTNAME_MAX (DNS_HOSTNAME_MAX + 2)
@@ -54,10 +59,11 @@ enum {
int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey);
int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig);
-int dnssec_verify_rrset(DnsAnswer *answer, DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime);
-int dnssec_verify_rrset_search(DnsAnswer *a, DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime);
+int dnssec_verify_rrset(DnsAnswer *answer, DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime, DnssecResult *result);
+int dnssec_verify_rrset_search(DnsAnswer *answer, DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime, DnssecResult *result);
int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds);
+int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds);
uint16_t dnssec_keytag(DnsResourceRecord *dnskey);
@@ -65,3 +71,6 @@ int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max);
const char* dnssec_mode_to_string(DnssecMode m) _const_;
DnssecMode dnssec_mode_from_string(const char *s) _pure_;
+
+const char* dnssec_result_to_string(DnssecResult m) _const_;
+DnssecResult dnssec_result_from_string(const char *s) _pure_;
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index f753b3522f..399ba59749 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -153,6 +153,7 @@ static void dns_packet_free(DnsPacket *p) {
dns_question_unref(p->question);
dns_answer_unref(p->answer);
+ dns_resource_record_unref(p->opt);
while ((s = hashmap_steal_first_key(p->names)))
free(s);
@@ -209,6 +210,7 @@ int dns_packet_validate_reply(DnsPacket *p) {
return -EBADMSG;
switch (p->protocol) {
+
case DNS_PROTOCOL_LLMNR:
/* RFC 4795, Section 2.1.1. says to discard all replies with QDCOUNT != 1 */
if (DNS_PACKET_QDCOUNT(p) != 1)
@@ -249,6 +251,7 @@ int dns_packet_validate_query(DnsPacket *p) {
return -EBADMSG;
switch (p->protocol) {
+
case DNS_PROTOCOL_LLMNR:
/* RFC 4795, Section 2.1.1. says to discard all queries with QDCOUNT != 1 */
if (DNS_PACKET_QDCOUNT(p) != 1)
@@ -963,6 +966,7 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
goto fail;
break;
+
case DNS_TYPE_NSEC3:
r = dns_packet_append_uint8(p, rr->nsec3.algorithm, NULL);
if (r < 0)
@@ -997,6 +1001,8 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
goto fail;
break;
+
+ case DNS_TYPE_OPT:
case _DNS_TYPE_INVALID: /* unparseable */
default:
@@ -1520,7 +1526,9 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
goto fail;
if (key->class == DNS_CLASS_ANY ||
- key->type == DNS_TYPE_ANY) {
+ key->type == DNS_TYPE_ANY ||
+ key->type == DNS_TYPE_AXFR ||
+ key->type == DNS_TYPE_IXFR) {
r = -EBADMSG;
goto fail;
}
@@ -1568,10 +1576,6 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
r = dns_packet_read_name(p, &rr->ptr.name, true, NULL);
break;
- case DNS_TYPE_OPT: /* we only care about the header */
- r = 0;
- break;
-
case DNS_TYPE_HINFO:
r = dns_packet_read_string(p, &rr->hinfo.cpu, NULL);
if (r < 0)
@@ -1749,6 +1753,7 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
}
break;
+
case DNS_TYPE_SSHFP:
r = dns_packet_read_uint8(p, &rr->sshfp.algorithm, NULL);
if (r < 0)
@@ -1911,6 +1916,8 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
break;
}
+
+ case DNS_TYPE_OPT: /* we only care about the header of OPT for now. */
default:
unparseable:
r = dns_packet_read_memdup(p, rdlength, &rr->generic.data, &rr->generic.size, NULL);
@@ -1986,9 +1993,16 @@ int dns_packet_extract(DnsPacket *p) {
if (r < 0)
goto finish;
- r = dns_answer_add(answer, rr, p->ifindex);
- if (r < 0)
- goto finish;
+ if (rr->key->type == DNS_TYPE_OPT) {
+ if (p->opt)
+ return -EBADMSG;
+
+ p->opt = dns_resource_record_ref(rr);
+ } else {
+ r = dns_answer_add(answer, rr, p->ifindex);
+ if (r < 0)
+ goto finish;
+ }
}
}
@@ -2007,6 +2021,30 @@ finish:
return r;
}
+int dns_packet_is_reply_for(DnsPacket *p, const DnsResourceKey *key) {
+ int r;
+
+ assert(p);
+ assert(key);
+
+ /* Checks if the specified packet is a reply for the specified
+ * key and the specified key is the only one in the question
+ * section. */
+
+ if (DNS_PACKET_QR(p) != 1)
+ return 0;
+
+ /* Let's unpack the packet, if that hasn't happened yet. */
+ r = dns_packet_extract(p);
+ if (r < 0)
+ return r;
+
+ if (p->question->n_keys != 1)
+ return 0;
+
+ return dns_resource_key_equal(p->question->keys[0], key);
+}
+
static const char* const dns_rcode_table[_DNS_RCODE_MAX_DEFINED] = {
[DNS_RCODE_SUCCESS] = "SUCCESS",
[DNS_RCODE_FORMERR] = "FORMERR",
diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index 3d84cb622b..5b6a71dc01 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -80,6 +80,7 @@ struct DnsPacket {
/* Parsed data */
DnsQuestion *question;
DnsAnswer *answer;
+ DnsResourceRecord *opt;
/* Packet reception metadata */
int ifindex;
@@ -160,6 +161,8 @@ int dns_packet_validate(DnsPacket *p);
int dns_packet_validate_reply(DnsPacket *p);
int dns_packet_validate_query(DnsPacket *p);
+int dns_packet_is_reply_for(DnsPacket *p, const DnsResourceKey *key);
+
int dns_packet_append_blob(DnsPacket *p, const void *d, size_t sz, size_t *start);
int dns_packet_append_uint8(DnsPacket *p, uint8_t v, size_t *start);
int dns_packet_append_uint16(DnsPacket *p, uint16_t v, size_t *start);
diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c
index 089d9fb70d..a6565f2ba2 100644
--- a/src/resolve/resolved-dns-query.c
+++ b/src/resolve/resolved-dns-query.c
@@ -59,7 +59,7 @@ static void dns_query_candidate_stop(DnsQueryCandidate *c) {
assert(c);
while ((t = set_steal_first(c->transactions))) {
- set_remove(t->query_candidates, c);
+ set_remove(t->notify_query_candidates, c);
dns_transaction_gc(t);
}
}
@@ -116,32 +116,35 @@ static int dns_query_candidate_add_transaction(DnsQueryCandidate *c, DnsResource
assert(c);
assert(key);
- r = set_ensure_allocated(&c->transactions, NULL);
- if (r < 0)
- return r;
-
t = dns_scope_find_transaction(c->scope, key, true);
if (!t) {
r = dns_transaction_new(&t, c->scope, key);
if (r < 0)
return r;
+ } else {
+ if (set_contains(c->transactions, t))
+ return 0;
}
- r = set_ensure_allocated(&t->query_candidates, NULL);
+ r = set_ensure_allocated(&c->transactions, NULL);
if (r < 0)
goto gc;
- r = set_put(t->query_candidates, c);
+ r = set_ensure_allocated(&t->notify_query_candidates, NULL);
+ if (r < 0)
+ goto gc;
+
+ r = set_put(t->notify_query_candidates, c);
if (r < 0)
goto gc;
r = set_put(c->transactions, t);
if (r < 0) {
- set_remove(t->query_candidates, c);
+ (void) set_remove(t->notify_query_candidates, c);
goto gc;
}
- return 0;
+ return 1;
gc:
dns_transaction_gc(t);
@@ -183,13 +186,20 @@ static DnsTransactionState dns_query_candidate_state(DnsQueryCandidate *c) {
switch (t->state) {
case DNS_TRANSACTION_PENDING:
- case DNS_TRANSACTION_NULL:
- return t->state;
+ case DNS_TRANSACTION_VALIDATING:
+ /* If there's one transaction currently in
+ * VALIDATING state, then this means there's
+ * also one in PENDING state, hence we can
+ * return PENDING immediately. */
+ return DNS_TRANSACTION_PENDING;
case DNS_TRANSACTION_SUCCESS:
state = t->state;
break;
+ case DNS_TRANSACTION_NULL:
+ assert_not_reached("Transaction not started?");
+
default:
if (state != DNS_TRANSACTION_SUCCESS)
state = t->state;
@@ -233,7 +243,7 @@ fail:
return r;
}
-void dns_query_candidate_ready(DnsQueryCandidate *c) {
+void dns_query_candidate_notify(DnsQueryCandidate *c) {
DnsTransactionState state;
int r;
@@ -241,7 +251,7 @@ void dns_query_candidate_ready(DnsQueryCandidate *c) {
state = dns_query_candidate_state(c);
- if (IN_SET(state, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_NULL))
+ if (DNS_TRANSACTION_IS_LIVE(state))
return;
if (state != DNS_TRANSACTION_SUCCESS && c->search_domain) {
@@ -394,8 +404,8 @@ int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for) {
static void dns_query_complete(DnsQuery *q, DnsTransactionState state) {
assert(q);
- assert(!IN_SET(state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING));
- assert(IN_SET(q->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING));
+ assert(!DNS_TRANSACTION_IS_LIVE(state));
+ assert(DNS_TRANSACTION_IS_LIVE(q->state));
/* Note that this call might invalidate the query. Callers
* should hence not attempt to access the query or transaction
@@ -970,9 +980,10 @@ fail:
static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) {
DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS;
+ bool has_authenticated = false, has_non_authenticated = false;
DnsTransaction *t;
Iterator i;
- bool has_authenticated = false, has_non_authenticated = false;
+ int r;
assert(q);
@@ -988,16 +999,11 @@ static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) {
case DNS_TRANSACTION_SUCCESS: {
/* We found a successfuly reply, merge it into the answer */
- DnsAnswer *merged;
-
- merged = dns_answer_merge(q->answer, t->answer);
- if (!merged) {
+ r = dns_answer_extend(&q->answer, t->answer);
+ if (r < 0) {
dns_query_complete(q, DNS_TRANSACTION_RESOURCES);
return;
}
-
- dns_answer_unref(q->answer);
- q->answer = merged;
q->answer_rcode = t->answer_rcode;
if (t->answer_authenticated)
@@ -1009,8 +1015,9 @@ static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) {
break;
}
- case DNS_TRANSACTION_PENDING:
case DNS_TRANSACTION_NULL:
+ case DNS_TRANSACTION_PENDING:
+ case DNS_TRANSACTION_VALIDATING:
case DNS_TRANSACTION_ABORTED:
/* Ignore transactions that didn't complete */
continue;
@@ -1049,7 +1056,7 @@ void dns_query_ready(DnsQuery *q) {
bool pending = false;
assert(q);
- assert(IN_SET(q->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING));
+ assert(DNS_TRANSACTION_IS_LIVE(q->state));
/* Note that this call might invalidate the query. Callers
* should hence not attempt to access the query or transaction
@@ -1066,14 +1073,16 @@ void dns_query_ready(DnsQuery *q) {
switch (state) {
case DNS_TRANSACTION_SUCCESS:
- /* One of the transactions is successful,
+ /* One of the candidates is successful,
* let's use it, and copy its data out */
dns_query_accept(q, c);
return;
- case DNS_TRANSACTION_PENDING:
case DNS_TRANSACTION_NULL:
- /* One of the transactions is still going on, let's maybe wait for it */
+ case DNS_TRANSACTION_PENDING:
+ case DNS_TRANSACTION_VALIDATING:
+ /* One of the candidates is still going on,
+ * let's maybe wait for it */
pending = true;
break;
@@ -1096,6 +1105,8 @@ static int dns_query_cname_redirect(DnsQuery *q, const DnsResourceRecord *cname)
assert(q);
+ log_debug("Following CNAME %s → %s", dns_question_first_name(q->question), cname->cname.name);
+
q->n_cname_redirects ++;
if (q->n_cname_redirects > CNAME_MAX)
return -ELOOP;
diff --git a/src/resolve/resolved-dns-query.h b/src/resolve/resolved-dns-query.h
index b71bb2352b..d7f96c3ca4 100644
--- a/src/resolve/resolved-dns-query.h
+++ b/src/resolve/resolved-dns-query.h
@@ -95,7 +95,7 @@ struct DnsQuery {
};
DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c);
-void dns_query_candidate_ready(DnsQueryCandidate *c);
+void dns_query_candidate_notify(DnsQueryCandidate *c);
int dns_query_new(Manager *m, DnsQuery **q, DnsQuestion *question, int family, uint64_t flags);
DnsQuery *dns_query_free(DnsQuery *q);
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 934a18334c..55e85eec2b 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -168,6 +168,9 @@ bool dns_resource_key_is_address(const DnsResourceKey *key) {
int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) {
int r;
+ if (a == b)
+ return 1;
+
r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b));
if (r <= 0)
return r;
@@ -187,6 +190,9 @@ int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord
assert(key);
assert(rr);
+ if (key == rr->key)
+ return 1;
+
/* Checks if an rr matches the specified key. If a search
* domain is specified, it will also be checked if the key
* with the search domain suffixed might match the RR. */
@@ -247,7 +253,24 @@ int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRec
}
return 0;
+}
+
+int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa) {
+ assert(soa);
+ assert(key);
+
+ /* Checks whether 'soa' is a SOA record for the specified key. */
+
+ if (soa->class != DNS_CLASS_IN)
+ return 0;
+ if (soa->type != DNS_TYPE_SOA)
+ return 0;
+
+ if (!dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(soa)))
+ return 0;
+
+ return 1;
}
static void dns_resource_key_hash_func(const void *i, struct siphash *state) {
@@ -303,7 +326,7 @@ int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) {
t = tbuf;
}
- if (asprintf(&s, "%s %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0)
+ if (asprintf(&s, "%s. %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0)
return -ENOMEM;
*ret = s;
@@ -503,6 +526,9 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
assert(a);
assert(b);
+ if (a == b)
+ return 1;
+
r = dns_resource_key_equal(a->key, b->key);
if (r <= 0)
return r;
@@ -1090,6 +1116,9 @@ DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i) {
bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) {
+ if (a == b)
+ return true;
+
if (!a != !b)
return false;
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index 5c2306ba96..4c0f72eea3 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -114,7 +114,7 @@ struct DnsResourceRecord {
struct {
void *data;
size_t size;
- } generic;
+ } generic, opt;
struct {
uint16_t priority;
@@ -247,6 +247,7 @@ bool dns_resource_key_is_address(const DnsResourceKey *key);
int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain);
int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain);
+int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa);
int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 4d83ac597c..61bca04b94 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -441,6 +441,10 @@ DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, co
dns_name_equal(domain, "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa") > 0)
return DNS_SCOPE_NO;
+ /* Never respond to some of the domains listed in RFC6761 */
+ if (dns_name_endswith(domain, "invalid") > 0)
+ return DNS_SCOPE_NO;
+
/* Always honour search domains for routing queries. Note that
* we return DNS_SCOPE_YES here, rather than just
* DNS_SCOPE_MAYBE, which means wildcard scopes won't be
@@ -818,7 +822,11 @@ static int dns_scope_make_conflict_packet(
0 /* (ad) */,
0 /* (cd) */,
0));
- random_bytes(&DNS_PACKET_HEADER(p)->id, sizeof(uint16_t));
+
+ /* For mDNS, the transaction ID should always be 0 */
+ if (s->protocol != DNS_PROTOCOL_MDNS)
+ random_bytes(&DNS_PACKET_HEADER(p)->id, sizeof(uint16_t));
+
DNS_PACKET_HEADER(p)->qdcount = htobe16(1);
DNS_PACKET_HEADER(p)->arcount = htobe16(1);
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index 90f07e6c4b..c03aa5d287 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -32,6 +32,7 @@
DnsTransaction* dns_transaction_free(DnsTransaction *t) {
DnsQueryCandidate *c;
DnsZoneItem *i;
+ DnsTransaction *z;
if (!t)
return NULL;
@@ -59,14 +60,25 @@ DnsTransaction* dns_transaction_free(DnsTransaction *t) {
dns_resource_key_unref(t->key);
- while ((c = set_steal_first(t->query_candidates)))
+ while ((c = set_steal_first(t->notify_query_candidates)))
set_remove(c->transactions, t);
+ set_free(t->notify_query_candidates);
- set_free(t->query_candidates);
-
- while ((i = set_steal_first(t->zone_items)))
+ while ((i = set_steal_first(t->notify_zone_items)))
i->probe_transaction = NULL;
- set_free(t->zone_items);
+ set_free(t->notify_zone_items);
+
+ while ((z = set_steal_first(t->notify_transactions)))
+ set_remove(z->dnssec_transactions, t);
+ set_free(t->notify_transactions);
+
+ while ((z = set_steal_first(t->dnssec_transactions))) {
+ set_remove(z->notify_transactions, t);
+ dns_transaction_gc(z);
+ }
+ set_free(t->dnssec_transactions);
+
+ dns_answer_unref(t->validated_keys);
free(t);
return NULL;
@@ -80,7 +92,9 @@ void dns_transaction_gc(DnsTransaction *t) {
if (t->block_gc > 0)
return;
- if (set_isempty(t->query_candidates) && set_isempty(t->zone_items))
+ if (set_isempty(t->notify_query_candidates) &&
+ set_isempty(t->notify_zone_items) &&
+ set_isempty(t->notify_transactions))
dns_transaction_free(t);
}
@@ -92,6 +106,14 @@ int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key)
assert(s);
assert(key);
+ /* Don't allow looking up invalid or pseudo RRs */
+ if (IN_SET(key->type, DNS_TYPE_OPT, 0, DNS_TYPE_TSIG, DNS_TYPE_TKEY))
+ return -EINVAL;
+
+ /* We only support the IN class */
+ if (key->class != DNS_CLASS_IN)
+ return -EOPNOTSUPP;
+
r = hashmap_ensure_allocated(&s->manager->dns_transactions, NULL);
if (r < 0)
return r;
@@ -106,6 +128,7 @@ int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key)
t->dns_udp_fd = -1;
t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID;
+ t->dnssec_result = _DNSSEC_RESULT_INVALID;
t->key = dns_resource_key_ref(key);
/* Find a fresh, unused transaction id */
@@ -175,7 +198,7 @@ static void dns_transaction_tentative(DnsTransaction *t, DnsPacket *p) {
log_debug("We have the lexicographically larger IP address and thus lost in the conflict.");
t->block_gc++;
- while ((z = set_first(t->zone_items))) {
+ while ((z = set_first(t->notify_zone_items))) {
/* First, make sure the zone item drops the reference
* to us */
dns_zone_item_probe_stop(z);
@@ -192,10 +215,11 @@ static void dns_transaction_tentative(DnsTransaction *t, DnsPacket *p) {
void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) {
DnsQueryCandidate *c;
DnsZoneItem *z;
+ DnsTransaction *d;
Iterator i;
assert(t);
- assert(!IN_SET(state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING));
+ assert(!DNS_TRANSACTION_IS_LIVE(state));
/* Note that this call might invalidate the query. Callers
* should hence not attempt to access the query or transaction
@@ -215,10 +239,12 @@ void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) {
/* Notify all queries that are interested, but make sure the
* transaction isn't freed while we are still looking at it */
t->block_gc++;
- SET_FOREACH(c, t->query_candidates, i)
- dns_query_candidate_ready(c);
- SET_FOREACH(z, t->zone_items, i)
- dns_zone_item_ready(z);
+ SET_FOREACH(c, t->notify_query_candidates, i)
+ dns_query_candidate_notify(c);
+ SET_FOREACH(z, t->notify_zone_items, i)
+ dns_zone_item_notify(z);
+ SET_FOREACH(d, t->notify_transactions, i)
+ dns_transaction_notify(d, t);
t->block_gc--;
dns_transaction_gc(t);
@@ -348,6 +374,73 @@ static void dns_transaction_next_dns_server(DnsTransaction *t) {
dns_scope_next_dns_server(t->scope);
}
+static void dns_transaction_cache_answer(DnsTransaction *t) {
+ unsigned n_cache;
+
+ assert(t);
+
+ /* For mDNS we cache whenever we get the packet, rather than
+ * in each transaction. */
+ if (!IN_SET(t->scope->protocol, DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR))
+ return;
+
+ /* We never cache if this packet is from the local host, under
+ * the assumption that a locally running DNS server would
+ * cache this anyway, and probably knows better when to flush
+ * the cache then we could. */
+ if (!DNS_PACKET_SHALL_CACHE(t->received))
+ return;
+
+ /* According to RFC 4795, section 2.9. only the RRs from the
+ * answer section shall be cached. However, if we know the
+ * message is authenticated, we might as well cache
+ * everything. */
+ if (t->answer_authenticated)
+ n_cache = dns_answer_size(t->answer);
+ else
+ n_cache = DNS_PACKET_ANCOUNT(t->received);
+
+ dns_cache_put(&t->scope->cache,
+ t->key,
+ t->answer_rcode,
+ t->answer,
+ n_cache,
+ t->answer_authenticated,
+ 0,
+ t->received->family,
+ &t->received->sender);
+}
+
+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 (!set_isempty(t->dnssec_transactions))
+ return;
+
+ /* All our auxiliary DNSSEC transactions are complete now. Try
+ * to validate our RRset now. */
+ r = dns_transaction_validate_dnssec(t);
+ if (r < 0) {
+ dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES);
+ return;
+ }
+
+ if (!IN_SET(t->dnssec_result, _DNSSEC_RESULT_INVALID, DNSSEC_VALIDATED, DNSSEC_NO_SIGNATURE /* FOR NOW! */)) {
+ dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED);
+ return;
+ }
+
+ dns_transaction_cache_answer(t);
+
+ if (t->answer_rcode == DNS_RCODE_SUCCESS)
+ dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS);
+ else
+ dns_transaction_complete(t, DNS_TRANSACTION_FAILURE);
+}
+
void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
usec_t ts;
int r;
@@ -362,7 +455,10 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
* should hence not attempt to access the query or transaction
* after calling this function. */
+ log_debug("Processing incoming packet on transaction %" PRIu16".", t->id);
+
switch (t->scope->protocol) {
+
case DNS_PROTOCOL_LLMNR:
assert(t->scope->link);
@@ -428,12 +524,13 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0);
switch (t->scope->protocol) {
+
case DNS_PROTOCOL_DNS:
assert(t->server);
if (IN_SET(DNS_PACKET_RCODE(p), DNS_RCODE_FORMERR, DNS_RCODE_SERVFAIL, DNS_RCODE_NOTIMP)) {
- /* request failed, immediately try again with reduced features */
+ /* Request failed, immediately try again with reduced features */
log_debug("Server returned error: %s", dns_rcode_to_string(DNS_PACKET_RCODE(p)));
dns_server_packet_failed(t->server, t->current_features);
@@ -449,13 +546,14 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
dns_server_packet_received(t->server, t->current_features, ts - t->start_usec, p->size);
break;
+
case DNS_PROTOCOL_LLMNR:
case DNS_PROTOCOL_MDNS:
dns_scope_packet_received(t->scope, ts - t->start_usec);
-
break;
+
default:
- break;
+ assert_not_reached("Invalid DNS protocol.");
}
if (DNS_PACKET_TC(p)) {
@@ -474,7 +572,7 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
return;
}
if (r < 0) {
- /* On LLMNR and mDNS, if we cannot connect to the host,
+ /* On LLMNR, if we cannot connect to the host,
* we immediately give up */
if (t->scope->protocol == DNS_PROTOCOL_LLMNR) {
dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES);
@@ -494,16 +592,22 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
}
}
- /* Parse and update the cache */
+ /* Parse message, if it isn't parsed yet. */
r = dns_packet_extract(p);
if (r < 0) {
dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY);
return;
}
- if (t->scope->protocol == DNS_PROTOCOL_DNS) {
+ if (IN_SET(t->scope->protocol, DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR)) {
+
/* Only consider responses with equivalent query section to the request */
- if (p->question->n_keys != 1 || dns_resource_key_equal(p->question->keys[0], t->key) <= 0) {
+ r = dns_packet_is_reply_for(p, t->key);
+ if (r < 0) {
+ dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES);
+ return;
+ }
+ if (r == 0) {
dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY);
return;
}
@@ -514,23 +618,19 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
t->answer_rcode = DNS_PACKET_RCODE(p);
t->answer_authenticated = t->scope->dnssec_mode == DNSSEC_TRUST && DNS_PACKET_AD(p);
- /* According to RFC 4795, section 2.9. only the RRs from the answer section shall be cached */
- if (DNS_PACKET_SHALL_CACHE(p))
- dns_cache_put(&t->scope->cache,
- t->key,
- DNS_PACKET_RCODE(p),
- p->answer,
- DNS_PACKET_ANCOUNT(p),
- t->answer_authenticated,
- 0,
- p->family,
- &p->sender);
+ r = dns_transaction_request_dnssec_keys(t);
+ if (r < 0) {
+ dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES);
+ return;
+ }
+ if (r > 0) {
+ /* There are DNSSEC transactions pending now. Update the state accordingly. */
+ t->state = DNS_TRANSACTION_VALIDATING;
+ return;
+ }
}
- if (DNS_PACKET_RCODE(p) == DNS_RCODE_SUCCESS)
- dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS);
- else
- dns_transaction_complete(t, DNS_TRANSACTION_FAILURE);
+ dns_transaction_process_dnssec(t);
}
static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
@@ -549,7 +649,7 @@ static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *use
DNS_PACKET_ID(p) == t->id)
dns_transaction_process_reply(t, p);
else
- log_debug("Invalid DNS packet.");
+ log_debug("Invalid DNS packet, ignoring.");
return 0;
}
@@ -644,7 +744,7 @@ static usec_t transaction_get_resend_timeout(DnsTransaction *t) {
}
}
-static int dns_transaction_prepare_next_attempt(DnsTransaction *t, usec_t ts) {
+static int dns_transaction_prepare(DnsTransaction *t, usec_t ts) {
bool had_stream;
int r;
@@ -689,7 +789,7 @@ static int dns_transaction_prepare_next_attempt(DnsTransaction *t, usec_t ts) {
/* Check the zone, but only if this transaction is not used
* for probing or verifying a zone item. */
- if (set_isempty(t->zone_items)) {
+ if (set_isempty(t->notify_zone_items)) {
r = dns_zone_lookup(&t->scope->zone, t->key, &t->answer, NULL, NULL);
if (r < 0)
@@ -705,7 +805,7 @@ static int dns_transaction_prepare_next_attempt(DnsTransaction *t, usec_t ts) {
/* Check the cache, but only if this transaction is not used
* for probing or verifying a zone item. */
- if (set_isempty(t->zone_items)) {
+ if (set_isempty(t->notify_zone_items)) {
/* Before trying the cache, let's make sure we figured out a
* server to use. Should this cause a change of server this
@@ -794,7 +894,7 @@ static int dns_transaction_make_packet_mdns(DnsTransaction *t) {
if (r < 0)
return r;
- r = dns_transaction_prepare_next_attempt(other, ts);
+ r = dns_transaction_prepare(other, ts);
if (r <= 0)
continue;
@@ -819,7 +919,6 @@ static int dns_transaction_make_packet_mdns(DnsTransaction *t) {
}
DNS_PACKET_HEADER(p)->qdcount = htobe16(qdcount);
- DNS_PACKET_HEADER(p)->id = t->id;
/* Append known answer section if we're asking for any shared record */
if (add_known_answers) {
@@ -876,14 +975,22 @@ int dns_transaction_go(DnsTransaction *t) {
assert(t);
assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0);
- r = dns_transaction_prepare_next_attempt(t, ts);
+
+ r = dns_transaction_prepare(t, ts);
if (r <= 0)
return r;
- log_debug("Excercising transaction on scope %s on %s/%s",
- dns_protocol_to_string(t->scope->protocol),
- t->scope->link ? t->scope->link->name : "*",
- t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family));
+ if (log_get_max_level() >= LOG_DEBUG) {
+ _cleanup_free_ char *ks = NULL;
+
+ (void) dns_resource_key_to_string(t->key, &ks);
+
+ log_debug("Excercising transaction for <%s> on scope %s on %s/%s",
+ ks ? strstrip(ks) : "???",
+ dns_protocol_to_string(t->scope->protocol),
+ t->scope->link ? t->scope->link->name : "*",
+ t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family));
+ }
if (!t->initial_jitter_scheduled &&
(t->scope->protocol == DNS_PROTOCOL_LLMNR ||
@@ -988,9 +1095,364 @@ int dns_transaction_go(DnsTransaction *t) {
return 1;
}
+static int dns_transaction_add_dnssec_transaction(DnsTransaction *t, DnsResourceKey *key, DnsTransaction **ret) {
+ DnsTransaction *aux;
+ int r;
+
+ assert(t);
+ assert(ret);
+ assert(key);
+
+ aux = dns_scope_find_transaction(t->scope, key, true);
+ if (!aux) {
+ r = dns_transaction_new(&aux, t->scope, key);
+ if (r < 0)
+ return r;
+ } else {
+ if (set_contains(t->dnssec_transactions, aux)) {
+ *ret = aux;
+ return 0;
+ }
+ }
+
+ r = set_ensure_allocated(&t->dnssec_transactions, NULL);
+ if (r < 0)
+ goto gc;
+
+ r = set_ensure_allocated(&aux->notify_transactions, NULL);
+ if (r < 0)
+ goto gc;
+
+ r = set_put(t->dnssec_transactions, aux);
+ if (r < 0)
+ goto gc;
+
+ r = set_put(aux->notify_transactions, t);
+ if (r < 0) {
+ (void) set_remove(t->dnssec_transactions, aux);
+ goto gc;
+ }
+
+ *ret = aux;
+ return 1;
+
+gc:
+ dns_transaction_gc(aux);
+ return r;
+}
+
+static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *key) {
+ _cleanup_(dns_answer_unrefp) DnsAnswer *a = NULL;
+ DnsTransaction *aux;
+ int r;
+
+ assert(t);
+ assert(key);
+
+ /* Try to get the data from the trust anchor */
+ r = dns_trust_anchor_lookup(&t->scope->manager->trust_anchor, key, &a);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ r = dns_answer_extend(&t->validated_keys, a);
+ if (r < 0)
+ return r;
+
+ return 0;
+ }
+
+ /* This didn't work, ask for it via the network/cache then. */
+ r = dns_transaction_add_dnssec_transaction(t, key, &aux);
+ if (r < 0)
+ return r;
+
+ if (aux->state == DNS_TRANSACTION_NULL) {
+ r = dns_transaction_go(aux);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
+ DnsResourceRecord *rr;
+ int r;
+
+ assert(t);
+
+ if (t->scope->dnssec_mode != DNSSEC_YES)
+ return 0;
+
+ DNS_ANSWER_FOREACH(rr, t->answer) {
+
+ switch (rr->key->type) {
+
+ case DNS_TYPE_RRSIG: {
+ /* For each RRSIG we request the matching DNSKEY */
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *dnskey = NULL;
+
+ /* If this RRSIG is about a DNSKEY RR and the
+ * signer is the same as the owner, then we
+ * already have the DNSKEY, and we don't have
+ * to look for more. */
+ if (rr->rrsig.type_covered == DNS_TYPE_DNSKEY) {
+ r = dns_name_equal(rr->rrsig.signer, DNS_RESOURCE_KEY_NAME(rr->key));
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
+ }
+
+ /* If the signer is not a parent of the owner,
+ * then the signature is bogus, let's ignore
+ * it. */
+ r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(rr->key), rr->rrsig.signer);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ dnskey = dns_resource_key_new(rr->key->class, DNS_TYPE_DNSKEY, rr->rrsig.signer);
+ if (!dnskey)
+ return -ENOMEM;
+
+ log_debug("Requesting DNSKEY to validate transaction %" PRIu16" (key tag: %" PRIu16 ").", t->id, rr->rrsig.key_tag);
+
+ r = dns_transaction_request_dnssec_rr(t, dnskey);
+ if (r < 0)
+ return r;
+ break;
+ }
+
+ case DNS_TYPE_DNSKEY: {
+ /* For each DNSKEY we request the matching DS */
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *ds = NULL;
+
+ ds = dns_resource_key_new(rr->key->class, DNS_TYPE_DS, DNS_RESOURCE_KEY_NAME(rr->key));
+ if (!ds)
+ return -ENOMEM;
+
+ log_debug("Requesting DS to validate transaction %" PRIu16" (key tag: %" PRIu16 ").", t->id, dnssec_keytag(rr));
+
+ r = dns_transaction_request_dnssec_rr(t, ds);
+ if (r < 0)
+ return r;
+
+ break;
+ }}
+ }
+
+ return !set_isempty(t->dnssec_transactions);
+}
+
+void dns_transaction_notify(DnsTransaction *t, DnsTransaction *source) {
+ int r;
+
+ assert(t);
+ assert(IN_SET(t->state, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING));
+ assert(source);
+
+ /* Invoked whenever any of our auxiliary DNSSEC transactions
+ completed its work. We simply copy the answer from that
+ transaction over. */
+
+ if (source->state != DNS_TRANSACTION_SUCCESS) {
+ log_debug("Auxiliary DNSSEC RR query failed.");
+ t->dnssec_result = DNSSEC_FAILED_AUXILIARY;
+ } else {
+ r = dns_answer_extend(&t->validated_keys, source->answer);
+ if (r < 0) {
+ log_error_errno(r, "Failed to merge validated DNSSEC key data: %m");
+ t->dnssec_result = DNSSEC_FAILED_AUXILIARY;
+ }
+ }
+
+ /* Detach us from the DNSSEC transaction. */
+ (void) set_remove(t->dnssec_transactions, source);
+ (void) set_remove(source->notify_transactions, t);
+
+ /* 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);
+}
+
+int dns_transaction_validate_dnssec(DnsTransaction *t) {
+ _cleanup_(dns_answer_unrefp) DnsAnswer *validated = NULL;
+ DnsResourceRecord *rr;
+ int ifindex, r;
+
+ assert(t);
+
+ /* We have now collected all DS and DNSKEY RRs in
+ * t->validated_keys, let's see which RRs we can now
+ * authenticate with that. */
+
+ if (t->scope->dnssec_mode != DNSSEC_YES)
+ return 0;
+
+ /* Already validated */
+ if (t->dnssec_result != _DNSSEC_RESULT_INVALID)
+ return 0;
+
+ if (IN_SET(t->answer_source, DNS_TRANSACTION_ZONE, DNS_TRANSACTION_TRUST_ANCHOR)) {
+ t->dnssec_result = DNSSEC_VALIDATED;
+ t->answer_authenticated = true;
+ return 0;
+ }
+
+ if (log_get_max_level() >= LOG_DEBUG) {
+ _cleanup_free_ char *ks = NULL;
+
+ (void) dns_resource_key_to_string(t->key, &ks);
+ log_debug("Validating response from transaction %" PRIu16 " (%s).", t->id, ks ? strstrip(ks) : "???");
+ }
+
+ /* First see if there are DNSKEYs we already known a validated DS for. */
+ DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, t->answer) {
+
+ r = dnssec_verify_dnskey_search(rr, t->validated_keys);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ /* If so, the DNSKEY is validated too. */
+ r = dns_answer_add_extend(&t->validated_keys, rr, ifindex);
+ if (r < 0)
+ return r;
+ }
+
+ for (;;) {
+ bool changed = false, missing_key_for_transaction = false;
+
+ DNS_ANSWER_FOREACH(rr, t->answer) {
+ DnssecResult result;
+
+ if (rr->key->type == DNS_TYPE_RRSIG)
+ continue;
+
+ r = dnssec_verify_rrset_search(t->answer, rr->key, t->validated_keys, USEC_INFINITY, &result);
+ if (r < 0)
+ return r;
+
+ if (log_get_max_level() >= LOG_DEBUG) {
+ _cleanup_free_ char *rrs = NULL;
+
+ (void) dns_resource_record_to_string(rr, &rrs);
+ log_debug("Looking at %s: %s", rrs ? strstrip(rrs) : "???", dnssec_result_to_string(result));
+ }
+
+ switch (result) {
+
+ case DNSSEC_VALIDATED:
+
+ /* Add the validated RRset to the new list of validated RRsets */
+ r = dns_answer_copy_by_key(&validated, t->answer, rr->key);
+ if (r < 0)
+ return r;
+
+ if (rr->key->type == DNS_TYPE_DNSKEY) {
+ /* If we just validated a
+ * DNSKEY RRset, then let's
+ * add these keys to the set
+ * of validated keys for this
+ * transaction. */
+
+ r = dns_answer_copy_by_key(&t->validated_keys, t->answer, rr->key);
+ if (r < 0)
+ return r;
+ }
+
+ /* Now, remove this RRset from the RRs still to process */
+ r = dns_answer_remove_by_key(&t->answer, rr->key);
+ if (r < 0)
+ return r;
+
+ changed = true;
+ break;
+
+ case DNSSEC_INVALID:
+ case DNSSEC_NO_SIGNATURE:
+ case DNSSEC_SIGNATURE_EXPIRED:
+
+ /* Is this the RRset that we were looking for? If so, this is fatal for the whole transaction */
+ r = dns_resource_key_match_rr(t->key, rr, NULL);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ t->dnssec_result = result;
+ return 0;
+ }
+
+ /* Is this a CNAME for a record we were looking for? If so, it's also fatal for the whole transaction */
+ r = dns_resource_key_match_cname(t->key, rr, NULL);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ t->dnssec_result = result;
+ return 0;
+ }
+
+ /* This is just something auxiliary. Just remove the RRset and continue. */
+ r = dns_answer_remove_by_key(&t->answer, rr->key);
+ if (r < 0)
+ return r;
+
+ changed = true;
+ break;
+
+ case DNSSEC_MISSING_KEY:
+ /* They key is missing? Let's continue
+ * with the next iteration, maybe
+ * we'll find it in an DNSKEY RRset
+ * later on. */
+
+ r = dns_resource_key_equal(rr->key, t->key);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ missing_key_for_transaction = true;
+
+ break;
+
+ default:
+ assert_not_reached("Unexpected DNSSEC result");
+ }
+
+ if (changed)
+ break;
+ }
+
+ if (changed)
+ continue;
+
+ /* This didn't work either, there's no point in
+ * continuing. */
+ if (missing_key_for_transaction) {
+ t->dnssec_result = DNSSEC_MISSING_KEY;
+ return 0;
+ }
+
+ break;
+ }
+
+ dns_answer_unref(t->answer);
+ t->answer = validated;
+ validated = NULL;
+
+ t->answer_authenticated = true;
+ t->dnssec_result = DNSSEC_VALIDATED;
+ return 1;
+}
+
static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX] = {
[DNS_TRANSACTION_NULL] = "null",
[DNS_TRANSACTION_PENDING] = "pending",
+ [DNS_TRANSACTION_VALIDATING] = "validating",
[DNS_TRANSACTION_FAILURE] = "failure",
[DNS_TRANSACTION_SUCCESS] = "success",
[DNS_TRANSACTION_NO_SERVERS] = "no-servers",
@@ -999,6 +1461,7 @@ static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX]
[DNS_TRANSACTION_INVALID_REPLY] = "invalid-reply",
[DNS_TRANSACTION_RESOURCES] = "resources",
[DNS_TRANSACTION_ABORTED] = "aborted",
+ [DNS_TRANSACTION_DNSSEC_FAILED] = "dnssec-failed",
};
DEFINE_STRING_TABLE_LOOKUP(dns_transaction_state, DnsTransactionState);
diff --git a/src/resolve/resolved-dns-transaction.h b/src/resolve/resolved-dns-transaction.h
index af08b20e44..2328e7937c 100644
--- a/src/resolve/resolved-dns-transaction.h
+++ b/src/resolve/resolved-dns-transaction.h
@@ -28,6 +28,7 @@ typedef enum DnsTransactionSource DnsTransactionSource;
enum DnsTransactionState {
DNS_TRANSACTION_NULL,
DNS_TRANSACTION_PENDING,
+ DNS_TRANSACTION_VALIDATING,
DNS_TRANSACTION_FAILURE,
DNS_TRANSACTION_SUCCESS,
DNS_TRANSACTION_NO_SERVERS,
@@ -36,10 +37,13 @@ enum DnsTransactionState {
DNS_TRANSACTION_INVALID_REPLY,
DNS_TRANSACTION_RESOURCES,
DNS_TRANSACTION_ABORTED,
+ DNS_TRANSACTION_DNSSEC_FAILED,
_DNS_TRANSACTION_STATE_MAX,
_DNS_TRANSACTION_STATE_INVALID = -1
};
+#define DNS_TRANSACTION_IS_LIVE(state) IN_SET((state), DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING)
+
enum DnsTransactionSource {
DNS_TRANSACTION_NETWORK,
DNS_TRANSACTION_CACHE,
@@ -60,6 +64,8 @@ struct DnsTransaction {
DnsResourceKey *key;
DnsTransactionState state;
+ DnssecResult dnssec_result;
+
uint16_t id;
bool initial_jitter_scheduled;
@@ -72,6 +78,9 @@ struct DnsTransaction {
DnsTransactionSource answer_source;
bool answer_authenticated;
+ /* Contains DS and DNSKEY RRs we already verified and need to authenticate this reply */
+ DnsAnswer *validated_keys;
+
usec_t start_usec;
usec_t next_attempt_after;
sd_event_source *timeout_event_source;
@@ -83,7 +92,7 @@ struct DnsTransaction {
/* The active server */
DnsServer *server;
- /* the features of the DNS server at time of transaction start */
+ /* The features of the DNS server at time of transaction start */
DnsServerFeatureLevel current_features;
/* TCP connection logic, if we need it */
@@ -92,11 +101,21 @@ struct DnsTransaction {
/* Query candidates this transaction is referenced by and that
* shall be notified about this specific transaction
* completing. */
- Set *query_candidates;
+ Set *notify_query_candidates;
/* Zone items this transaction is referenced by and that shall
* be notified about completion. */
- Set *zone_items;
+ Set *notify_zone_items;
+
+ /* Other transactions that this transactions is referenced by
+ * and that shall be notified about completion. This is used
+ * when transactions want to validate their RRsets, but need
+ * another DNSKEY or DS RR to do so. */
+ Set *notify_transactions;
+
+ /* The opposite direction: the transactions this transaction
+ * created in order to request DNSKEY or DS RRs. */
+ Set *dnssec_transactions;
unsigned block_gc;
@@ -112,6 +131,10 @@ int dns_transaction_go(DnsTransaction *t);
void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p);
void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state);
+void dns_transaction_notify(DnsTransaction *t, DnsTransaction *source);
+int dns_transaction_validate_dnssec(DnsTransaction *t);
+int dns_transaction_request_dnssec_keys(DnsTransaction *t);
+
const char* dns_transaction_state_to_string(DnsTransactionState p) _const_;
DnsTransactionState dns_transaction_state_from_string(const char *s) _pure_;
diff --git a/src/resolve/resolved-dns-zone.c b/src/resolve/resolved-dns-zone.c
index 78f44d51a2..8046e2ed34 100644
--- a/src/resolve/resolved-dns-zone.c
+++ b/src/resolve/resolved-dns-zone.c
@@ -39,7 +39,7 @@ void dns_zone_item_probe_stop(DnsZoneItem *i) {
t = i->probe_transaction;
i->probe_transaction = NULL;
- set_remove(t->zone_items, i);
+ set_remove(t->notify_zone_items, i);
dns_transaction_gc(t);
}
@@ -184,11 +184,11 @@ static int dns_zone_item_probe_start(DnsZoneItem *i) {
return r;
}
- r = set_ensure_allocated(&t->zone_items, NULL);
+ r = set_ensure_allocated(&t->notify_zone_items, NULL);
if (r < 0)
goto gc;
- r = set_put(t->zone_items, i);
+ r = set_put(t->notify_zone_items, i);
if (r < 0)
goto gc;
@@ -206,7 +206,7 @@ static int dns_zone_item_probe_start(DnsZoneItem *i) {
}
}
- dns_zone_item_ready(i);
+ dns_zone_item_notify(i);
return 0;
gc:
@@ -491,7 +491,7 @@ void dns_zone_item_conflict(DnsZoneItem *i) {
manager_next_hostname(i->scope->manager);
}
-void dns_zone_item_ready(DnsZoneItem *i) {
+void dns_zone_item_notify(DnsZoneItem *i) {
_cleanup_free_ char *pretty = NULL;
assert(i);
@@ -500,7 +500,7 @@ void dns_zone_item_ready(DnsZoneItem *i) {
if (i->block_ready > 0)
return;
- if (IN_SET(i->probe_transaction->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING))
+ if (IN_SET(i->probe_transaction->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING))
return;
if (i->probe_transaction->state == DNS_TRANSACTION_SUCCESS) {
diff --git a/src/resolve/resolved-dns-zone.h b/src/resolve/resolved-dns-zone.h
index 44a8624c30..dbd6a2a368 100644
--- a/src/resolve/resolved-dns-zone.h
+++ b/src/resolve/resolved-dns-zone.h
@@ -70,7 +70,7 @@ void dns_zone_remove_rr(DnsZone *z, DnsResourceRecord *rr);
int dns_zone_lookup(DnsZone *z, DnsResourceKey *key, DnsAnswer **answer, DnsAnswer **soa, bool *tentative);
void dns_zone_item_conflict(DnsZoneItem *i);
-void dns_zone_item_ready(DnsZoneItem *i);
+void dns_zone_item_notify(DnsZoneItem *i);
int dns_zone_check_conflicts(DnsZone *zone, DnsResourceRecord *rr);
int dns_zone_verify_conflicts(DnsZone *zone, DnsResourceKey *key);
diff --git a/src/resolve/resolved-mdns.c b/src/resolve/resolved-mdns.c
index abe63d58c1..d6973a6999 100644
--- a/src/resolve/resolved-mdns.c
+++ b/src/resolve/resolved-mdns.c
@@ -86,7 +86,7 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us
}
if (dns_packet_validate_reply(p) > 0) {
- unsigned i;
+ DnsResourceRecord *rr;
log_debug("Got mDNS reply packet");
@@ -107,11 +107,15 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us
dns_scope_check_conflicts(scope, p);
- for (i = 0; i < p->answer->n_rrs; i++) {
- DnsResourceRecord *rr;
+ DNS_ANSWER_FOREACH(rr, p->answer) {
+ const char *name = DNS_RESOURCE_KEY_NAME(rr->key);
DnsTransaction *t;
- rr = p->answer->items[i].rr;
+ /* If the received reply packet contains ANY record that is not .local or .in-addr.arpa,
+ * we assume someone's playing tricks on us and discard the packet completely. */
+ if (!(dns_name_endswith(name, "in-addr.arpa") > 0 ||
+ dns_name_endswith(name, "local") > 0))
+ return 0;
t = dns_scope_find_transaction(scope, rr->key, false);
if (t)
diff --git a/src/resolve/test-dnssec.c b/src/resolve/test-dnssec.c
index 0b2ffeeddd..a2118513f1 100644
--- a/src/resolve/test-dnssec.c
+++ b/src/resolve/test-dnssec.c
@@ -56,6 +56,7 @@ static void test_dnssec_verify_rrset(void) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *a = NULL, *rrsig = NULL, *dnskey = NULL;
_cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
_cleanup_free_ char *x = NULL, *y = NULL, *z = NULL;
+ DnssecResult result;
a = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, "nAsA.gov");
assert_se(a);
@@ -106,7 +107,8 @@ static void test_dnssec_verify_rrset(void) {
assert_se(dns_answer_add(answer, a, 0) >= 0);
/* Validate the RR as it if was 2015-12-2 today */
- assert_se(dnssec_verify_rrset(answer, a->key, rrsig, dnskey, 1449092754*USEC_PER_SEC) == DNSSEC_VERIFIED);
+ assert_se(dnssec_verify_rrset(answer, a->key, rrsig, dnskey, 1449092754*USEC_PER_SEC, &result) >= 0);
+ assert_se(result == DNSSEC_VALIDATED);
}
static void test_dnssec_verify_dns_key(void) {
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-15 09:52:25 +0000