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authorTom Gundersen <teg@jklm.no>2015-12-20 01:35:44 +0000
committerTom Gundersen <teg@jklm.no>2015-12-20 01:35:44 +0000
commitd73fe9134fcabe69e2984691e998e259d26d064b (patch)
treecea21a40a678c2902aa25836240038bc16e026ed /src
parent0038f71da9db5eb163c9ca7885189e53c7416f9a (diff)
parent6773896e850e498278e460f4fb57b8a214572f9c (diff)
Merge pull request #2190 from poettering/dnssec6
Add DNSSEC proof of unsignedness and NSEC3 proof
Diffstat (limited to 'src')
-rw-r--r--src/resolve-host/resolve-host.c18
-rw-r--r--src/resolve/dns-type.c36
-rw-r--r--src/resolve/dns-type.h29
-rw-r--r--src/resolve/resolved-bus.c5
-rw-r--r--src/resolve/resolved-dns-answer.c206
-rw-r--r--src/resolve/resolved-dns-answer.h60
-rw-r--r--src/resolve/resolved-dns-cache.c268
-rw-r--r--src/resolve/resolved-dns-cache.h2
-rw-r--r--src/resolve/resolved-dns-dnssec.c283
-rw-r--r--src/resolve/resolved-dns-dnssec.h9
-rw-r--r--src/resolve/resolved-dns-packet.c52
-rw-r--r--src/resolve/resolved-dns-packet.h4
-rw-r--r--src/resolve/resolved-dns-query.c59
-rw-r--r--src/resolve/resolved-dns-query.h3
-rw-r--r--src/resolve/resolved-dns-rr.c30
-rw-r--r--src/resolve/resolved-dns-rr.h14
-rw-r--r--src/resolve/resolved-dns-scope.c5
-rw-r--r--src/resolve/resolved-dns-transaction.c811
-rw-r--r--src/resolve/resolved-dns-transaction.h24
-rw-r--r--src/resolve/resolved-dns-trust-anchor.c2
-rw-r--r--src/resolve/resolved-dns-zone.c8
-rw-r--r--src/resolve/resolved-link.c13
-rw-r--r--src/resolve/resolved-manager.c4
-rw-r--r--src/resolve/resolved-mdns.c3
-rw-r--r--src/resolve/test-dnssec.c4
-rw-r--r--src/shared/dns-domain.c16
-rw-r--r--src/shared/dns-domain.h4
27 files changed, 1516 insertions, 456 deletions
diff --git a/src/resolve-host/resolve-host.c b/src/resolve-host/resolve-host.c
index 0f154d9798..3e4b52a3a9 100644
--- a/src/resolve-host/resolve-host.c
+++ b/src/resolve-host/resolve-host.c
@@ -38,7 +38,7 @@
static int arg_family = AF_UNSPEC;
static int arg_ifindex = 0;
-static int arg_type = 0;
+static uint16_t arg_type = 0;
static uint16_t arg_class = 0;
static bool arg_legend = true;
static uint64_t arg_flags = 0;
@@ -347,7 +347,6 @@ static int resolve_record(sd_bus *bus, const char *name) {
if (r < 0)
return bus_log_create_error(r);
- assert((uint16_t) arg_type == arg_type);
r = sd_bus_message_append(req, "isqqt", arg_ifindex, name, arg_class, arg_type, arg_flags);
if (r < 0)
return bus_log_create_error(r);
@@ -399,7 +398,7 @@ static int resolve_record(sd_bus *bus, const char *name) {
if (r < 0)
return log_oom();
- r = dns_packet_read_rr(p, &rr, NULL);
+ r = dns_packet_read_rr(p, &rr, NULL, NULL);
if (r < 0) {
log_error("Failed to parse RR.");
return r;
@@ -758,12 +757,13 @@ static int parse_argv(int argc, char *argv[]) {
return 0;
}
- arg_type = dns_type_from_string(optarg);
- if (arg_type < 0) {
+ r = dns_type_from_string(optarg);
+ if (r < 0) {
log_error("Failed to parse RR record type %s", optarg);
- return arg_type;
+ return r;
}
- assert(arg_type > 0 && (uint16_t) arg_type == arg_type);
+ arg_type = (uint16_t) r;
+ assert((int) arg_type == r);
break;
@@ -773,11 +773,13 @@ static int parse_argv(int argc, char *argv[]) {
return 0;
}
- r = dns_class_from_string(optarg, &arg_class);
+ r = dns_class_from_string(optarg);
if (r < 0) {
log_error("Failed to parse RR record class %s", optarg);
return r;
}
+ arg_class = (uint16_t) r;
+ assert((int) arg_class == r);
break;
diff --git a/src/resolve/dns-type.c b/src/resolve/dns-type.c
index 8281da3b7c..cc52ef9abe 100644
--- a/src/resolve/dns-type.c
+++ b/src/resolve/dns-type.c
@@ -20,6 +20,7 @@
***/
#include "dns-type.h"
+#include "string-util.h"
typedef const struct {
uint16_t type;
@@ -64,6 +65,10 @@ bool dns_type_is_pseudo(uint16_t type) {
);
}
+bool dns_class_is_pseudo(uint16_t class) {
+ return class == DNS_TYPE_ANY;
+}
+
bool dns_type_is_valid_query(uint16_t type) {
/* The types valid as questions in packets */
@@ -85,3 +90,34 @@ bool dns_type_is_valid_rr(uint16_t type) {
DNS_TYPE_AXFR,
DNS_TYPE_IXFR);
}
+
+bool dns_class_is_valid_rr(uint16_t class) {
+ return class != DNS_CLASS_ANY;
+}
+
+const char *dns_class_to_string(uint16_t class) {
+
+ switch (class) {
+
+ case DNS_CLASS_IN:
+ return "IN";
+
+ case DNS_CLASS_ANY:
+ return "ANY";
+ }
+
+ return NULL;
+}
+
+int dns_class_from_string(const char *s) {
+
+ if (!s)
+ return _DNS_CLASS_INVALID;
+
+ if (strcaseeq(s, "IN"))
+ return DNS_CLASS_IN;
+ else if (strcaseeq(s, "ANY"))
+ return DNS_CLASS_ANY;
+
+ return _DNS_CLASS_INVALID;
+}
diff --git a/src/resolve/dns-type.h b/src/resolve/dns-type.h
index 038a0d0e54..bea0adaa16 100644
--- a/src/resolve/dns-type.h
+++ b/src/resolve/dns-type.h
@@ -23,13 +23,6 @@
#include "macro.h"
-const char *dns_type_to_string(int type);
-int dns_type_from_string(const char *s);
-
-bool dns_type_is_pseudo(uint16_t type);
-bool dns_type_is_valid_query(uint16_t type);
-bool dns_type_is_valid_rr(uint16_t type);
-
/* DNS record types, taken from
* http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml.
*/
@@ -122,3 +115,25 @@ enum {
assert_cc(DNS_TYPE_SSHFP == 44);
assert_cc(DNS_TYPE_TLSA == 52);
assert_cc(DNS_TYPE_ANY == 255);
+
+/* DNS record classes, see RFC 1035 */
+enum {
+ DNS_CLASS_IN = 0x01,
+ DNS_CLASS_ANY = 0xFF,
+
+ _DNS_CLASS_MAX,
+ _DNS_CLASS_INVALID = -1
+};
+
+bool dns_type_is_pseudo(uint16_t type);
+bool dns_type_is_valid_query(uint16_t type);
+bool dns_type_is_valid_rr(uint16_t type);
+
+bool dns_class_is_pseudo(uint16_t class);
+bool dns_class_is_valid_rr(uint16_t class);
+
+const char *dns_type_to_string(int type);
+int dns_type_from_string(const char *s);
+
+const char *dns_class_to_string(uint16_t type);
+int dns_class_from_string(const char *name);
diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c
index c8c0d3d9b8..af08a0555d 100644
--- a/src/resolve/resolved-bus.c
+++ b/src/resolve/resolved-bus.c
@@ -61,9 +61,10 @@ static int reply_query_state(DnsQuery *q) {
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");
+ return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "DNSSEC validation failed: %s",
+ dnssec_result_to_string(q->answer_dnssec_result));
- case DNS_TRANSACTION_FAILURE: {
+ case DNS_TRANSACTION_RCODE_FAILURE: {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
if (q->answer_rcode == DNS_RCODE_NXDOMAIN)
diff --git a/src/resolve/resolved-dns-answer.c b/src/resolve/resolved-dns-answer.c
index 5355303bd3..70577453e8 100644
--- a/src/resolve/resolved-dns-answer.c
+++ b/src/resolve/resolved-dns-answer.c
@@ -74,7 +74,7 @@ DnsAnswer *dns_answer_unref(DnsAnswer *a) {
return NULL;
}
-static int dns_answer_add_raw(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
+static int dns_answer_add_raw(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags) {
assert(rr);
if (!a)
@@ -83,19 +83,22 @@ static int dns_answer_add_raw(DnsAnswer *a, DnsResourceRecord *rr, int ifindex)
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++;
+ a->items[a->n_rrs++] = (DnsAnswerItem) {
+ .rr = dns_resource_record_ref(rr),
+ .ifindex = ifindex,
+ .flags = flags,
+ };
return 1;
}
static int dns_answer_add_raw_all(DnsAnswer *a, DnsAnswer *source) {
DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
int ifindex, r;
- DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, source) {
- r = dns_answer_add_raw(a, rr, ifindex);
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, source) {
+ r = dns_answer_add_raw(a, rr, ifindex, flags);
if (r < 0)
return r;
}
@@ -103,7 +106,7 @@ static int dns_answer_add_raw_all(DnsAnswer *a, DnsAnswer *source) {
return 0;
}
-int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
+int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags) {
unsigned i;
int r;
@@ -131,19 +134,21 @@ int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
a->items[i].rr = rr;
}
+ a->items[i].flags |= flags;
return 0;
}
}
- return dns_answer_add_raw(a, rr, ifindex);
+ return dns_answer_add_raw(a, rr, ifindex, flags);
}
static int dns_answer_add_all(DnsAnswer *a, DnsAnswer *b) {
DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
int ifindex, r;
- DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, b) {
- r = dns_answer_add(a, rr, ifindex);
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, b) {
+ r = dns_answer_add(a, rr, ifindex, flags);
if (r < 0)
return r;
}
@@ -151,7 +156,7 @@ static int dns_answer_add_all(DnsAnswer *a, DnsAnswer *b) {
return 0;
}
-int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex) {
+int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags) {
int r;
assert(a);
@@ -161,7 +166,7 @@ int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex) {
if (r < 0)
return r;
- return dns_answer_add(*a, rr, ifindex);
+ return dns_answer_add(*a, rr, ifindex, flags);
}
int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) {
@@ -187,66 +192,136 @@ int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) {
soa->soa.expire = 1;
soa->soa.minimum = ttl;
- return dns_answer_add(a, soa, 0);
+ return dns_answer_add(a, soa, 0, DNS_ANSWER_AUTHENTICATED);
}
-int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key) {
+int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *ret_flags) {
+ DnsAnswerFlags flags = 0, i_flags;
DnsResourceRecord *i;
+ bool found = false;
int r;
assert(key);
- if (!a)
- return 0;
-
- DNS_ANSWER_FOREACH(i, a) {
+ DNS_ANSWER_FOREACH_FLAGS(i, i_flags, a) {
r = dns_resource_key_match_rr(key, i, NULL);
if (r < 0)
return r;
- if (r > 0)
+ if (r == 0)
+ continue;
+
+ if (!ret_flags)
return 1;
+
+ if (found)
+ flags &= i_flags;
+ else {
+ flags = i_flags;
+ found = true;
+ }
}
- return 0;
+ if (ret_flags)
+ *ret_flags = flags;
+
+ return found;
}
-int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr) {
+int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr, DnsAnswerFlags *ret_flags) {
+ DnsAnswerFlags flags = 0, i_flags;
DnsResourceRecord *i;
+ bool found = false;
int r;
assert(rr);
- DNS_ANSWER_FOREACH(i, a) {
+ DNS_ANSWER_FOREACH_FLAGS(i, i_flags, a) {
r = dns_resource_record_equal(i, rr);
if (r < 0)
return r;
- if (r > 0)
+ if (r == 0)
+ continue;
+
+ if (!ret_flags)
return 1;
+
+ if (found)
+ flags &= i_flags;
+ else {
+ flags = i_flags;
+ found = true;
+ }
}
- return 0;
+ if (ret_flags)
+ *ret_flags = flags;
+
+ return found;
}
-int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret) {
- DnsResourceRecord *rr;
+int dns_answer_contains_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *ret_flags) {
+ DnsAnswerFlags flags = 0, i_flags;
+ DnsResourceRecord *i;
+ bool found = false;
int r;
assert(key);
- if (!a)
- return 0;
+ DNS_ANSWER_FOREACH_FLAGS(i, i_flags, a) {
+ r = dns_resource_key_equal(i->key, key);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (!ret_flags)
+ return true;
+
+ if (found)
+ flags &= i_flags;
+ else {
+ flags = i_flags;
+ found = true;
+ }
+ }
+
+ if (ret_flags)
+ *ret_flags = flags;
+
+ return found;
+}
+
+int dns_answer_contains_nsec_or_nsec3(DnsAnswer *a) {
+ DnsResourceRecord *i;
+
+ DNS_ANSWER_FOREACH(i, a) {
+ if (IN_SET(i->key->type, DNS_TYPE_NSEC, DNS_TYPE_NSEC3))
+ return true;
+ }
+
+ return false;
+}
+
+int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags) {
+ DnsResourceRecord *rr;
+ DnsAnswerFlags rr_flags;
+ int r;
+
+ assert(key);
/* For a SOA record we can never find a matching SOA record */
if (key->type == DNS_TYPE_SOA)
return 0;
- DNS_ANSWER_FOREACH(rr, a) {
+ DNS_ANSWER_FOREACH_FLAGS(rr, rr_flags, a) {
r = dns_resource_key_match_soa(key, rr->key);
if (r < 0)
return r;
if (r > 0) {
if (ret)
*ret = rr;
+ if (flags)
+ *flags = rr_flags;
return 1;
}
}
@@ -254,26 +329,26 @@ int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceReco
return 0;
}
-int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret) {
+int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags) {
DnsResourceRecord *rr;
+ DnsAnswerFlags rr_flags;
int r;
assert(key);
- if (!a)
- return 0;
-
/* For a {C,D}NAME record we can never find a matching {C,D}NAME record */
if (key->type == DNS_TYPE_CNAME || key->type == DNS_TYPE_DNAME)
return 0;
- DNS_ANSWER_FOREACH(rr, a) {
+ DNS_ANSWER_FOREACH_FLAGS(rr, rr_flags, a) {
r = dns_resource_key_match_cname_or_dname(key, rr->key, NULL);
if (r < 0)
return r;
if (r > 0) {
if (ret)
*ret = rr;
+ if (flags)
+ *flags = rr_flags;
return 1;
}
}
@@ -365,20 +440,21 @@ int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key) {
if ((*a)->n_ref > 1) {
_cleanup_(dns_answer_unrefp) DnsAnswer *copy = NULL;
+ DnsAnswerFlags flags;
int ifindex;
copy = dns_answer_new((*a)->n_rrs);
if (!copy)
return -ENOMEM;
- DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, *a) {
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, *a) {
r = dns_resource_key_equal(rr->key, key);
if (r < 0)
return r;
if (r > 0)
continue;
- r = dns_answer_add_raw(copy, rr, ifindex);
+ r = dns_answer_add_raw(copy, rr, ifindex, flags);
if (r < 0)
return r;
}
@@ -416,16 +492,17 @@ int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key) {
return 1;
}
-int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key) {
+int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags) {
DnsResourceRecord *rr_source;
int ifindex_source, r;
+ DnsAnswerFlags flags_source;
assert(a);
assert(key);
/* Copy all RRs matching the specified key from source into *a */
- DNS_ANSWER_FOREACH_IFINDEX(rr_source, ifindex_source, source) {
+ DNS_ANSWER_FOREACH_FULL(rr_source, ifindex_source, flags_source, source) {
r = dns_resource_key_equal(rr_source->key, key);
if (r < 0)
@@ -438,7 +515,7 @@ int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKe
if (r < 0)
return r;
- r = dns_answer_add(*a, rr_source, ifindex_source);
+ r = dns_answer_add(*a, rr_source, ifindex_source, flags_source|or_flags);
if (r < 0)
return r;
}
@@ -446,6 +523,20 @@ int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKe
return 0;
}
+int dns_answer_move_by_key(DnsAnswer **to, DnsAnswer **from, const DnsResourceKey *key, DnsAnswerFlags or_flags) {
+ int r;
+
+ assert(to);
+ assert(from);
+ assert(key);
+
+ r = dns_answer_copy_by_key(to, *from, key, or_flags);
+ if (r < 0)
+ return r;
+
+ return dns_answer_remove_by_key(from, key);
+}
+
void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) {
DnsAnswerItem *items;
unsigned i, start, end;
@@ -548,3 +639,40 @@ int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free) {
return 0;
}
+
+void dns_answer_dump(DnsAnswer *answer, FILE *f) {
+ DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
+ int ifindex, r;
+
+ if (!f)
+ f = stdout;
+
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, answer) {
+ _cleanup_free_ char *t = NULL;
+
+ fputc('\t', f);
+
+ r = dns_resource_record_to_string(rr, &t);
+ if (r < 0) {
+ log_oom();
+ continue;
+ }
+
+ fputs(t, f);
+
+ if (ifindex != 0 || flags & (DNS_ANSWER_AUTHENTICATED|DNS_ANSWER_CACHEABLE|DNS_ANSWER_SHARED_OWNER))
+ fputs("\t;", f);
+
+ if (ifindex != 0)
+ printf(" ifindex=%i", ifindex);
+ if (flags & DNS_ANSWER_AUTHENTICATED)
+ fputs(" authenticated", f);
+ if (flags & DNS_ANSWER_CACHEABLE)
+ fputs(" cachable", f);
+ if (flags & DNS_ANSWER_SHARED_OWNER)
+ fputs(" shared-owner", f);
+
+ fputc('\n', f);
+ }
+}
diff --git a/src/resolve/resolved-dns-answer.h b/src/resolve/resolved-dns-answer.h
index 56b462ed7e..28ded3b252 100644
--- a/src/resolve/resolved-dns-answer.h
+++ b/src/resolve/resolved-dns-answer.h
@@ -32,11 +32,18 @@ typedef struct DnsAnswerItem DnsAnswerItem;
* can qualify A and AAAA RRs referring to a local link with the
* right ifindex.
*
- * Note that we usually encode the empty answer as a simple NULL. */
+ * Note that we usually encode the the empty DnsAnswer object as a simple NULL. */
+
+typedef enum DnsAnswerFlags {
+ DNS_ANSWER_AUTHENTICATED = 1, /* Item has been authenticated */
+ DNS_ANSWER_CACHEABLE = 2, /* Item is subject to caching */
+ DNS_ANSWER_SHARED_OWNER = 4, /* For mDNS: RRset may be owner by multiple peers */
+} DnsAnswerFlags;
struct DnsAnswerItem {
DnsResourceRecord *rr;
int ifindex;
+ DnsAnswerFlags flags;
};
struct DnsAnswer {
@@ -49,15 +56,17 @@ DnsAnswer *dns_answer_new(unsigned n);
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(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags);
+int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags);
int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl);
-int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key);
-int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr);
+int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags);
+int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr, DnsAnswerFlags *combined_flags);
+int dns_answer_contains_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags);
+int dns_answer_contains_nsec_or_nsec3(DnsAnswer *a);
-int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret);
-int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret);
+int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags);
+int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags);
int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret);
int dns_answer_extend(DnsAnswer **a, DnsAnswer *b);
@@ -68,12 +77,15 @@ 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);
+int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags);
+int dns_answer_move_by_key(DnsAnswer **to, DnsAnswer **from, const DnsResourceKey *key, DnsAnswerFlags or_flags);
static inline unsigned dns_answer_size(DnsAnswer *a) {
return a ? a->n_rrs : 0;
}
+void dns_answer_dump(DnsAnswer *answer, FILE *f);
+
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
#define _DNS_ANSWER_FOREACH(q, kk, a) \
@@ -93,6 +105,36 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
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), (ifi) = ((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)
+
+#define _DNS_ANSWER_FOREACH_FLAGS(q, kk, fl, a) \
+ for (unsigned UNIQ_T(i, q) = ({ \
+ (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
+ (fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 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), \
+ (fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0))
+
+#define DNS_ANSWER_FOREACH_FLAGS(kk, flags, a) _DNS_ANSWER_FOREACH_FLAGS(UNIQ, kk, flags, a)
+
+#define _DNS_ANSWER_FOREACH_FULL(q, kk, ifi, fl, a) \
+ for (unsigned UNIQ_T(i, q) = ({ \
+ (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
+ (ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
+ (fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 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), \
+ (ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0), \
+ (fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0))
+
+#define DNS_ANSWER_FOREACH_FULL(kk, ifindex, flags, a) _DNS_ANSWER_FOREACH_FULL(UNIQ, kk, ifindex, flags, a)
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index 62713b5a6a..f50d780ebb 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -26,11 +26,11 @@
#include "resolved-dns-packet.h"
#include "string-util.h"
-/* Never cache more than 1K entries */
-#define CACHE_MAX 1024
+/* Never cache more than 4K entries */
+#define CACHE_MAX 4096
-/* We never keep any item longer than 10min in our cache */
-#define CACHE_TTL_MAX_USEC (10 * USEC_PER_MINUTE)
+/* We never keep any item longer than 2h in our cache */
+#define CACHE_TTL_MAX_USEC (2 * USEC_PER_HOUR)
typedef enum DnsCacheItemType DnsCacheItemType;
typedef struct DnsCacheItem DnsCacheItem;
@@ -42,14 +42,18 @@ enum DnsCacheItemType {
};
struct DnsCacheItem {
+ DnsCacheItemType type;
DnsResourceKey *key;
DnsResourceRecord *rr;
+
usec_t until;
- DnsCacheItemType type;
- unsigned prioq_idx;
- bool authenticated;
+ bool authenticated:1;
+ bool shared_owner:1;
+
int owner_family;
union in_addr_union owner_address;
+
+ unsigned prioq_idx;
LIST_FIELDS(DnsCacheItem, by_key);
};
@@ -64,7 +68,7 @@ static void dns_cache_item_free(DnsCacheItem *i) {
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsCacheItem*, dns_cache_item_free);
-static void dns_cache_item_remove_and_free(DnsCache *c, DnsCacheItem *i) {
+static void dns_cache_item_unlink_and_free(DnsCache *c, DnsCacheItem *i) {
DnsCacheItem *first;
assert(c);
@@ -85,34 +89,55 @@ static void dns_cache_item_remove_and_free(DnsCache *c, DnsCacheItem *i) {
dns_cache_item_free(i);
}
-void dns_cache_flush(DnsCache *c) {
- DnsCacheItem *i;
+static bool dns_cache_remove_by_rr(DnsCache *c, DnsResourceRecord *rr) {
+ DnsCacheItem *first, *i;
+ int r;
+
+ first = hashmap_get(c->by_key, rr->key);
+ LIST_FOREACH(by_key, i, first) {
+ r = dns_resource_record_equal(i->rr, rr);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ dns_cache_item_unlink_and_free(c, i);
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool dns_cache_remove_by_key(DnsCache *c, DnsResourceKey *key) {
+ DnsCacheItem *first, *i, *n;
assert(c);
+ assert(key);
- while ((i = hashmap_first(c->by_key)))
- dns_cache_item_remove_and_free(c, i);
+ first = hashmap_remove(c->by_key, key);
+ if (!first)
+ return false;
- assert(hashmap_size(c->by_key) == 0);
- assert(prioq_size(c->by_expiry) == 0);
+ LIST_FOREACH_SAFE(by_key, i, n, first) {
+ prioq_remove(c->by_expiry, i, &i->prioq_idx);
+ dns_cache_item_free(i);
+ }
- c->by_key = hashmap_free(c->by_key);
- c->by_expiry = prioq_free(c->by_expiry);
+ return true;
}
-static bool dns_cache_remove(DnsCache *c, DnsResourceKey *key) {
- DnsCacheItem *i;
- bool exist = false;
+void dns_cache_flush(DnsCache *c) {
+ DnsResourceKey *key;
assert(c);
- assert(key);
- while ((i = hashmap_get(c->by_key, key))) {
- dns_cache_item_remove_and_free(c, i);
- exist = true;
- }
+ while ((key = hashmap_first_key(c->by_key)))
+ dns_cache_remove_by_key(c, key);
- return exist;
+ assert(hashmap_size(c->by_key) == 0);
+ assert(prioq_size(c->by_expiry) == 0);
+
+ c->by_key = hashmap_free(c->by_key);
+ c->by_expiry = prioq_free(c->by_expiry);
}
static void dns_cache_make_space(DnsCache *c, unsigned add) {
@@ -142,7 +167,7 @@ static void dns_cache_make_space(DnsCache *c, unsigned add) {
/* Take an extra reference to the key so that it
* doesn't go away in the middle of the remove call */
key = dns_resource_key_ref(i->key);
- dns_cache_remove(c, key);
+ dns_cache_remove_by_key(c, key);
}
}
@@ -154,7 +179,6 @@ void dns_cache_prune(DnsCache *c) {
/* Remove all entries that are past their TTL */
for (;;) {
- _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
DnsCacheItem *i;
i = prioq_peek(c->by_expiry);
@@ -167,10 +191,19 @@ void dns_cache_prune(DnsCache *c) {
if (i->until > t)
break;
- /* Take an extra reference to the key so that it
- * doesn't go away in the middle of the remove call */
- key = dns_resource_key_ref(i->key);
- dns_cache_remove(c, key);
+ /* Depending whether this is an mDNS shared entry
+ * either remove only this one RR or the whole
+ * RRset */
+ if (i->shared_owner)
+ dns_cache_item_unlink_and_free(c, i);
+ else {
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
+
+ /* Take an extra reference to the key so that it
+ * doesn't go away in the middle of the remove call */
+ key = dns_resource_key_ref(i->key);
+ dns_cache_remove_by_key(c, key);
+ }
}
}
@@ -239,10 +272,20 @@ static DnsCacheItem* dns_cache_get(DnsCache *c, DnsResourceRecord *rr) {
return NULL;
}
-static void dns_cache_item_update_positive(DnsCache *c, DnsCacheItem *i, DnsResourceRecord *rr, bool authenticated, usec_t timestamp) {
+static void dns_cache_item_update_positive(
+ DnsCache *c,
+ DnsCacheItem *i,
+ DnsResourceRecord *rr,
+ bool authenticated,
+ bool shared_owner,
+ usec_t timestamp,
+ int owner_family,
+ const union in_addr_union *owner_address) {
+
assert(c);
assert(i);
assert(rr);
+ assert(owner_address);
i->type = DNS_CACHE_POSITIVE;
@@ -259,8 +302,12 @@ static void dns_cache_item_update_positive(DnsCache *c, DnsCacheItem *i, DnsReso
dns_resource_key_unref(i->key);
i->key = dns_resource_key_ref(rr->key);
- i->authenticated = authenticated;
i->until = timestamp + MIN(rr->ttl * USEC_PER_SEC, CACHE_TTL_MAX_USEC);
+ i->authenticated = authenticated;
+ i->shared_owner = shared_owner;
+
+ i->owner_family = owner_family;
+ i->owner_address = *owner_address;
prioq_reshuffle(c->by_expiry, i, &i->prioq_idx);
}
@@ -269,6 +316,7 @@ static int dns_cache_put_positive(
DnsCache *c,
DnsResourceRecord *rr,
bool authenticated,
+ bool shared_owner,
usec_t timestamp,
int owner_family,
const union in_addr_union *owner_address) {
@@ -282,9 +330,15 @@ static int dns_cache_put_positive(
assert(rr);
assert(owner_address);
- /* New TTL is 0? Delete the entry... */
+ /* Never cache pseudo RRs */
+ if (dns_class_is_pseudo(rr->key->class))
+ return 0;
+ if (dns_type_is_pseudo(rr->key->type))
+ return 0;
+
+ /* New TTL is 0? Delete this specific entry... */
if (rr->ttl <= 0) {
- k = dns_cache_remove(c, rr->key);
+ k = dns_cache_remove_by_rr(c, rr);
if (log_get_max_level() >= LOG_DEBUG) {
r = dns_resource_key_to_string(rr->key, &key_str);
@@ -300,15 +354,18 @@ static int dns_cache_put_positive(
return 0;
}
- if (rr->key->class == DNS_CLASS_ANY)
- return 0;
- if (dns_type_is_pseudo(rr->key->type))
- return 0;
-
- /* Entry exists already? Update TTL and timestamp */
+ /* Entry exists already? Update TTL, timestamp and owner*/
existing = dns_cache_get(c, rr);
if (existing) {
- dns_cache_item_update_positive(c, existing, rr, authenticated, timestamp);
+ dns_cache_item_update_positive(
+ c,
+ existing,
+ rr,
+ authenticated,
+ shared_owner,
+ timestamp,
+ owner_family,
+ owner_address);
return 0;
}
@@ -327,10 +384,11 @@ static int dns_cache_put_positive(
i->key = dns_resource_key_ref(rr->key);
i->rr = dns_resource_record_ref(rr);
i->until = timestamp + MIN(i->rr->ttl * USEC_PER_SEC, CACHE_TTL_MAX_USEC);
- i->prioq_idx = PRIOQ_IDX_NULL;
+ i->authenticated = authenticated;
+ i->shared_owner = shared_owner;
i->owner_family = owner_family;
i->owner_address = *owner_address;
- i->authenticated = authenticated;
+ i->prioq_idx = PRIOQ_IDX_NULL;
r = dns_cache_link_item(c, i);
if (r < 0)
@@ -341,7 +399,7 @@ static int dns_cache_put_positive(
if (r < 0)
return r;
- log_debug("Added cache entry for %s", key_str);
+ log_debug("Added positive cache entry for %s", key_str);
}
i = NULL;
@@ -366,14 +424,14 @@ static int dns_cache_put_negative(
assert(key);
assert(owner_address);
- dns_cache_remove(c, key);
-
- if (key->class == DNS_CLASS_ANY)
+ /* Never cache pseudo RR keys. DNS_TYPE_ANY is particularly
+ * important to filter out as we use this as a pseudo-type for
+ * NXDOMAIN entries */
+ if (dns_class_is_pseudo(key->class))
return 0;
if (dns_type_is_pseudo(key->type))
- /* ANY is particularly important to filter out as we
- * use this as a pseudo-type for NXDOMAIN entries */
return 0;
+
if (soa_ttl <= 0) {
if (log_get_max_level() >= LOG_DEBUG) {
r = dns_resource_key_to_string(key, &key_str);
@@ -401,10 +459,10 @@ static int dns_cache_put_negative(
i->type = rcode == DNS_RCODE_SUCCESS ? DNS_CACHE_NODATA : DNS_CACHE_NXDOMAIN;
i->until = timestamp + MIN(soa_ttl * USEC_PER_SEC, CACHE_TTL_MAX_USEC);
- i->prioq_idx = PRIOQ_IDX_NULL;
+ i->authenticated = authenticated;
i->owner_family = owner_family;
i->owner_address = *owner_address;
- i->authenticated = authenticated;
+ i->prioq_idx = PRIOQ_IDX_NULL;
if (i->type == DNS_CACHE_NXDOMAIN) {
/* NXDOMAIN entries should apply equally to all types, so we use ANY as
@@ -431,30 +489,57 @@ static int dns_cache_put_negative(
return 0;
}
+static void dns_cache_remove_previous(
+ DnsCache *c,
+ DnsResourceKey *key,
+ DnsAnswer *answer) {
+
+ DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
+
+ assert(c);
+
+ /* First, if we were passed a key (i.e. on LLMNR/DNS, but
+ * not on mDNS), delete all matching old RRs, so that we only
+ * keep complete by_key in place. */
+ if (key)
+ dns_cache_remove_by_key(c, key);
+
+ /* Second, flush all entries matching the answer, unless this
+ * is an RR that is explicitly marked to be "shared" between
+ * peers (i.e. mDNS RRs without the flush-cache bit set). */
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+ if ((flags & DNS_ANSWER_CACHEABLE) == 0)
+ continue;
+
+ if (flags & DNS_ANSWER_SHARED_OWNER)
+ continue;
+
+ dns_cache_remove_by_key(c, rr->key);
+ }
+}
+
int dns_cache_put(
DnsCache *c,
DnsResourceKey *key,
int rcode,
DnsAnswer *answer,
- unsigned max_rrs,
bool authenticated,
usec_t timestamp,
int owner_family,
const union in_addr_union *owner_address) {
DnsResourceRecord *soa = NULL, *rr;
- unsigned cache_keys, i;
+ DnsAnswerFlags flags;
+ unsigned cache_keys;
int r;
assert(c);
+ assert(owner_address);
- if (key) {
- /* First, if we were passed a key, delete all matching old RRs,
- * so that we only keep complete by_key in place. */
- dns_cache_remove(c, key);
- }
+ dns_cache_remove_previous(c, key, answer);
- if (!answer) {
+ if (dns_answer_size(answer) <= 0) {
if (log_get_max_level() >= LOG_DEBUG) {
_cleanup_free_ char *key_str = NULL;
@@ -468,19 +553,13 @@ int dns_cache_put(
return 0;
}
- DNS_ANSWER_FOREACH(rr, answer)
- if (rr->key->cache_flush)
- dns_cache_remove(c, rr->key);
-
/* We only care for positive replies and NXDOMAINs, on all
* other replies we will simply flush the respective entries,
* and that's it */
-
if (!IN_SET(rcode, DNS_RCODE_SUCCESS, DNS_RCODE_NXDOMAIN))
return 0;
- cache_keys = answer->n_rrs;
-
+ cache_keys = dns_answer_size(answer);
if (key)
cache_keys ++;
@@ -491,19 +570,26 @@ int dns_cache_put(
timestamp = now(clock_boottime_or_monotonic());
/* Second, add in positive entries for all contained RRs */
- for (i = 0; i < MIN(max_rrs, answer->n_rrs); i++) {
- rr = answer->items[i].rr;
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+ if ((flags & DNS_ANSWER_CACHEABLE) == 0)
+ continue;
- r = dns_cache_put_positive(c, rr, authenticated, timestamp, owner_family, owner_address);
+ r = dns_cache_put_positive(
+ c,
+ rr,
+ flags & DNS_ANSWER_AUTHENTICATED,
+ flags & DNS_ANSWER_SHARED_OWNER,
+ timestamp,
+ owner_family, owner_address);
if (r < 0)
goto fail;
}
- if (!key)
+ if (!key) /* mDNS doesn't know negative caching, really */
return 0;
/* Third, add in negative entries if the key has no RR */
- r = dns_answer_match_key(answer, key);
+ r = dns_answer_match_key(answer, key, NULL);
if (r < 0)
goto fail;
if (r > 0)
@@ -512,7 +598,7 @@ int dns_cache_put(
/* But not if it has a matching CNAME/DNAME (the negative
* caching will be done on the canonical name, not on the
* alias) */
- r = dns_answer_find_cname_or_dname(answer, key, NULL);
+ r = dns_answer_find_cname_or_dname(answer, key, NULL, NULL);
if (r < 0)
goto fail;
if (r > 0)
@@ -522,13 +608,25 @@ int dns_cache_put(
* matching SOA record in the packet is used to to enable
* negative caching. */
- r = dns_answer_find_soa(answer, key, &soa);
+ r = dns_answer_find_soa(answer, key, &soa, &flags);
if (r < 0)
goto fail;
if (r == 0)
return 0;
- r = dns_cache_put_negative(c, key, rcode, authenticated, timestamp, MIN(soa->soa.minimum, soa->ttl), owner_family, owner_address);
+ /* Refuse using the SOA data if it is unsigned, but the key is
+ * signed */
+ if (authenticated && (flags & DNS_ANSWER_AUTHENTICATED) == 0)
+ return 0;
+
+ 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;
@@ -539,10 +637,14 @@ fail:
* added, just in case */
if (key)
- dns_cache_remove(c, key);
+ dns_cache_remove_by_key(c, key);
+
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+ if ((flags & DNS_ANSWER_CACHEABLE) == 0)
+ continue;
- for (i = 0; i < answer->n_rrs; i++)
- dns_cache_remove(c, answer->items[i].rr->key);
+ dns_cache_remove_by_key(c, rr->key);
+ }
return r;
}
@@ -582,8 +684,6 @@ static DnsCacheItem *dns_cache_get_by_key_follow_cname_dname_nsec(DnsCache *c, D
/* OK, let's look for cached DNAME records. */
for (;;) {
- char label[DNS_LABEL_MAX];
-
if (isempty(n))
return NULL;
@@ -592,13 +692,13 @@ static DnsCacheItem *dns_cache_get_by_key_follow_cname_dname_nsec(DnsCache *c, D
return i;
/* Jump one label ahead */
- r = dns_label_unescape(&n, label, sizeof(label));
+ r = dns_name_parent(&n);
if (r <= 0)
return NULL;
}
}
- if (k-> type != DNS_TYPE_NSEC) {
+ if (k->type != DNS_TYPE_NSEC) {
/* Check if we have an NSEC record instead for the name. */
i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_NSEC, n));
if (i)
@@ -722,7 +822,7 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
if (!j->rr)
continue;
- r = dns_answer_add(answer, j->rr, 0);
+ r = dns_answer_add(answer, j->rr, 0, j->authenticated ? DNS_ANSWER_AUTHENTICATED : 0);
if (r < 0)
return r;
}
@@ -787,7 +887,7 @@ int dns_cache_export_shared_to_packet(DnsCache *cache, DnsPacket *p) {
if (!j->rr)
continue;
- if (!dns_key_is_shared(j->rr->key))
+ if (!j->shared_owner)
continue;
r = dns_packet_append_rr(p, j->rr, NULL, NULL);
diff --git a/src/resolve/resolved-dns-cache.h b/src/resolve/resolved-dns-cache.h
index 0f28bbe543..856c975299 100644
--- a/src/resolve/resolved-dns-cache.h
+++ b/src/resolve/resolved-dns-cache.h
@@ -39,7 +39,7 @@ 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, unsigned max_rrs, 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, 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 ed126505ad..814cb1c0f9 100644
--- a/src/resolve/resolved-dns-dnssec.c
+++ b/src/resolve/resolved-dns-dnssec.c
@@ -35,16 +35,13 @@
*
* TODO:
*
- * - Iterative validation
- * - NSEC proof of non-existance
- * - NSEC3 proof of non-existance
* - Make trust anchor store read additional DS+DNSKEY data from disk
* - wildcard zones compatibility
* - multi-label zone compatibility
- * - DNSSEC cname/dname compatibility
+ * - cname/dname compatibility
* - per-interface DNSSEC setting
- * - retry on failed validation
* - fix TTL for cache entries to match RRSIG TTL
+ * - retry on failed validation?
* - DSA support
* - EC support?
*
@@ -499,7 +496,7 @@ int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnske
return dns_name_equal(DNS_RESOURCE_KEY_NAME(dnskey->key), rrsig->rrsig.signer);
}
-int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig) {
+int dnssec_key_match_rrsig(const DnsResourceKey *key, DnsResourceRecord *rrsig) {
assert(key);
assert(rrsig);
@@ -529,7 +526,7 @@ int dnssec_verify_rrset_search(
assert(key);
assert(result);
- /* Verifies all RRs from "a" that match the key "key", against DNSKEY and DS RRs in "validated_dnskeys" */
+ /* Verifies all RRs from "a" that match the key "key" against DNSKEYs in "validated_dnskeys" */
if (!a || a->n_rrs <= 0)
return -ENODATA;
@@ -537,6 +534,7 @@ int dnssec_verify_rrset_search(
/* Iterate through each RRSIG RR. */
DNS_ANSWER_FOREACH(rrsig, a) {
DnsResourceRecord *dnskey;
+ DnsAnswerFlags flags;
/* Is this an RRSIG RR that applies to RRs matching our key? */
r = dnssec_key_match_rrsig(key, rrsig);
@@ -548,9 +546,12 @@ int dnssec_verify_rrset_search(
found_rrsig = true;
/* Look for a matching key */
- DNS_ANSWER_FOREACH(dnskey, validated_dnskeys) {
+ DNS_ANSWER_FOREACH_FLAGS(dnskey, flags, validated_dnskeys) {
DnssecResult one_result;
+ if ((flags & DNS_ANSWER_AUTHENTICATED) == 0)
+ continue;
+
/* Is this a DNSKEY RR that matches they key of our RRSIG? */
r = dnssec_rrsig_match_dnskey(rrsig, dnskey);
if (r < 0)
@@ -626,6 +627,23 @@ int dnssec_verify_rrset_search(
return 0;
}
+int dnssec_has_rrsig(DnsAnswer *a, const DnsResourceKey *key) {
+ DnsResourceRecord *rr;
+ int r;
+
+ /* Checks whether there's at least one RRSIG in 'a' that proctects RRs of the specified key */
+
+ DNS_ANSWER_FOREACH(rr, a) {
+ r = dnssec_key_match_rrsig(key, rr);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return 1;
+ }
+
+ return 0;
+}
+
int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max) {
size_t c = 0;
int r;
@@ -776,6 +794,7 @@ finish:
int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds) {
DnsResourceRecord *ds;
+ DnsAnswerFlags flags;
int r;
assert(dnskey);
@@ -783,7 +802,10 @@ int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_
if (dnskey->key->type != DNS_TYPE_DNSKEY)
return 0;
- DNS_ANSWER_FOREACH(ds, validated_ds) {
+ DNS_ANSWER_FOREACH_FLAGS(ds, flags, validated_ds) {
+
+ if ((flags & DNS_ANSWER_AUTHENTICATED) == 0)
+ continue;
if (ds->key->type != DNS_TYPE_DS)
continue;
@@ -866,114 +888,218 @@ finish:
return r;
}
-int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result) {
+static int dnssec_test_nsec3(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result) {
+ _cleanup_free_ char *next_closer_domain = NULL, *l = NULL;
+ uint8_t hashed[DNSSEC_HASH_SIZE_MAX];
+ const char *p, *pp = NULL;
DnsResourceRecord *rr;
- int r;
+ DnsAnswerFlags flags;
+ int hashed_size, r;
assert(key);
assert(result);
- /* Look for any NSEC/NSEC3 RRs that say something about the specified key. */
-
- DNS_ANSWER_FOREACH(rr, answer) {
+ /* First step, look for the closest encloser NSEC3 RR in 'answer' that matches 'key' */
+ p = DNS_RESOURCE_KEY_NAME(key);
+ for (;;) {
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+ _cleanup_free_ char *hashed_domain = NULL, *label = NULL;
- if (rr->key->class != key->class)
- continue;
+ if ((flags & DNS_ANSWER_AUTHENTICATED) == 0)
+ continue;
- switch (rr->key->type) {
+ if (rr->key->type != DNS_TYPE_NSEC3)
+ continue;
- case DNS_TYPE_NSEC:
+ /* RFC 5155, Section 8.2 says we MUST ignore NSEC3 RRs with flags != 0 or 1 */
+ if (!IN_SET(rr->nsec3.flags, 0, 1))
+ continue;
- r = dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key));
+ r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(rr->key), p);
if (r < 0)
return r;
- if (r > 0) {
- *result = bitmap_isset(rr->nsec.types, key->type) ? DNSSEC_NSEC_FOUND : DNSSEC_NSEC_NODATA;
+ if (r == 0)
+ continue;
+
+ hashed_size = dnssec_nsec3_hash(rr, p, hashed);
+ if (hashed_size == -EOPNOTSUPP) {
+ *result = DNSSEC_NSEC_UNSUPPORTED_ALGORITHM;
return 0;
}
+ if (hashed_size < 0)
+ return hashed_size;
+ if (rr->nsec3.next_hashed_name_size != (size_t) hashed_size)
+ return -EBADMSG;
- r = dns_name_between(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key), rr->nsec.next_domain_name);
+ label = base32hexmem(hashed, hashed_size, false);
+ if (!label)
+ return -ENOMEM;
+
+ hashed_domain = strjoin(label, ".", p, NULL);
+ if (!hashed_domain)
+ return -ENOMEM;
+
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), hashed_domain);
if (r < 0)
return r;
- if (r > 0) {
- *result = DNSSEC_NSEC_NXDOMAIN;
- return 0;
- }
+ if (r > 0)
+ goto found;
+ }
+
+ /* We didn't find the closest encloser with this name,
+ * but let's remember this domain name, it might be
+ * the next closer name */
+
+ pp = p;
+
+ /* Strip one label from the front */
+ r = dns_name_parent(&p);
+ if (r < 0)
+ return r;
+ if (r == 0)
break;
+ }
- case DNS_TYPE_NSEC3: {
- _cleanup_free_ void *decoded = NULL;
- size_t decoded_size;
- char label[DNS_LABEL_MAX];
- uint8_t hashed[DNSSEC_HASH_SIZE_MAX];
- int label_length, c, q;
- const char *p;
- bool covered;
+ *result = DNSSEC_NSEC_NO_RR;
+ return 0;
- /* RFC 5155, Section 8.2 says we MUST ignore NSEC3 RRs with flags != 0 or 1 */
- if (!IN_SET(rr->nsec3.flags, 0, 1))
- continue;
+found:
+ /* We found a closest encloser in 'p'; next closer is 'pp' */
- p = DNS_RESOURCE_KEY_NAME(rr->key);
- label_length = dns_label_unescape(&p, label, sizeof(label));
- if (label_length < 0)
- return label_length;
- if (label_length == 0)
- continue;
+ /* Ensure this is not a DNAME domain, see RFC5155, section 8.3. */
+ if (bitmap_isset(rr->nsec3.types, DNS_TYPE_DNAME))
+ return -EBADMSG;
- r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), p);
- if (r < 0)
- return r;
- if (r == 0)
- continue;
+ /* Ensure that this data is from the delegated domain
+ * (i.e. originates from the "lower" DNS server), and isn't
+ * just glue records (i.e. doesn't originate from the "upper"
+ * DNS server). */
+ if (bitmap_isset(rr->nsec3.types, DNS_TYPE_NS) &&
+ !bitmap_isset(rr->nsec3.types, DNS_TYPE_SOA))
+ return -EBADMSG;
- r = unbase32hexmem(label, label_length, false, &decoded, &decoded_size);
- if (r == -EINVAL)
- continue;
- if (r < 0)
- return r;
+ if (!pp) {
+ /* No next closer NSEC3 RR. That means there's a direct NSEC3 RR for our key. */
+ *result = bitmap_isset(rr->nsec3.types, key->type) ? DNSSEC_NSEC_FOUND : DNSSEC_NSEC_NODATA;
+ return 0;
+ }
- if (decoded_size != rr->nsec3.next_hashed_name_size)
- continue;
+ r = dnssec_nsec3_hash(rr, pp, hashed);
+ if (r < 0)
+ return r;
+ if (r != hashed_size)
+ return -EBADMSG;
- c = memcmp(decoded, rr->nsec3.next_hashed_name, decoded_size);
- if (c == 0)
- continue;
+ l = base32hexmem(hashed, hashed_size, false);
+ if (!l)
+ return -ENOMEM;
- r = dnssec_nsec3_hash(rr, DNS_RESOURCE_KEY_NAME(key), hashed);
- /* RFC 5155, Section 8.1 says we MUST ignore NSEC3 RRs with unknown algorithms */
- if (r == -EOPNOTSUPP)
- continue;
- if (r < 0)
- return r;
- if ((size_t) r != decoded_size)
- continue;
+ next_closer_domain = strjoin(l, ".", p, NULL);
+ if (!next_closer_domain)
+ return -ENOMEM;
- r = memcmp(decoded, hashed, decoded_size);
- if (r == 0) {
- *result = bitmap_isset(rr->nsec3.types, key->type) ? DNSSEC_NSEC_FOUND : DNSSEC_NSEC_NODATA;
- return 0;
- }
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+ _cleanup_free_ char *label = NULL, *next_hashed_domain = NULL;
+ const char *nsec3_parent;
+
+ if ((flags & DNS_ANSWER_AUTHENTICATED) == 0)
+ continue;
- q = memcmp(hashed, rr->nsec3.next_hashed_name, decoded_size);
+ if (rr->key->type != DNS_TYPE_NSEC3)
+ continue;
- covered = c < 0 ?
- r < 0 && q < 0 :
- q < 0 || r < 0;
+ /* RFC 5155, Section 8.2 says we MUST ignore NSEC3 RRs with flags != 0 or 1 */
+ if (!IN_SET(rr->nsec3.flags, 0, 1))
+ continue;
- if (covered) {
+ nsec3_parent = DNS_RESOURCE_KEY_NAME(rr->key);
+ r = dns_name_parent(&nsec3_parent);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ r = dns_name_equal(p, nsec3_parent);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ label = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false);
+ if (!label)
+ return -ENOMEM;
+
+ next_hashed_domain = strjoin(label, ".", p, NULL);
+ if (!next_hashed_domain)
+ return -ENOMEM;
+
+ r = dns_name_between(DNS_RESOURCE_KEY_NAME(rr->key), next_closer_domain, next_hashed_domain);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ if (rr->nsec3.flags & 1)
+ *result = DNSSEC_NSEC_OPTOUT;
+ else
*result = DNSSEC_NSEC_NXDOMAIN;
+
+ return 1;
+ }
+ }
+
+ *result = DNSSEC_NSEC_NO_RR;
+ return 0;
+}
+
+int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result) {
+ DnsResourceRecord *rr;
+ bool have_nsec3 = false;
+ DnsAnswerFlags flags;
+ int r;
+
+ assert(key);
+ assert(result);
+
+ /* Look for any NSEC/NSEC3 RRs that say something about the specified key. */
+
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+
+ if (rr->key->class != key->class)
+ continue;
+
+ if ((flags & DNS_ANSWER_AUTHENTICATED) == 0)
+ continue;
+
+ switch (rr->key->type) {
+
+ case DNS_TYPE_NSEC:
+
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key));
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ *result = bitmap_isset(rr->nsec.types, key->type) ? DNSSEC_NSEC_FOUND : DNSSEC_NSEC_NODATA;
return 0;
}
+ r = dns_name_between(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key), rr->nsec.next_domain_name);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ *result = DNSSEC_NSEC_NXDOMAIN;
+ return 0;
+ }
break;
- }
- default:
+ case DNS_TYPE_NSEC3:
+ have_nsec3 = true;
break;
}
}
+ /* OK, this was not sufficient. Let's see if NSEC3 can help. */
+ if (have_nsec3)
+ return dnssec_test_nsec3(answer, key, result);
+
/* No approproate NSEC RR found, report this. */
*result = DNSSEC_NSEC_NO_RR;
return 0;
@@ -981,7 +1107,6 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
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);
diff --git a/src/resolve/resolved-dns-dnssec.h b/src/resolve/resolved-dns-dnssec.h
index 442e301302..d17d5142f5 100644
--- a/src/resolve/resolved-dns-dnssec.h
+++ b/src/resolve/resolved-dns-dnssec.h
@@ -32,9 +32,6 @@ enum DnssecMode {
/* No DNSSEC validation is done */
DNSSEC_NO,
- /* Trust the AD bit sent by the server. UNSAFE! */
- DNSSEC_TRUST,
-
/* Validate locally, if the server knows DO, but if not, don't. Don't trust the AD bit */
DNSSEC_YES,
@@ -67,7 +64,7 @@ enum DnssecResult {
#define DNSSEC_HASH_SIZE_MAX (MAX(20, 32))
int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey);
-int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig);
+int dnssec_key_match_rrsig(const DnsResourceKey *key, DnsResourceRecord *rrsig);
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);
@@ -75,6 +72,8 @@ int dnssec_verify_rrset_search(DnsAnswer *answer, DnsResourceKey *key, DnsAnswer
int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds);
int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds);
+int dnssec_has_rrsig(DnsAnswer *a, const DnsResourceKey *key);
+
uint16_t dnssec_keytag(DnsResourceRecord *dnskey);
int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max);
@@ -83,9 +82,11 @@ int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret);
typedef enum DnssecNsecResult {
DNSSEC_NSEC_NO_RR, /* No suitable NSEC/NSEC3 RR found */
+ DNSSEC_NSEC_UNSUPPORTED_ALGORITHM,
DNSSEC_NSEC_NXDOMAIN,
DNSSEC_NSEC_NODATA,
DNSSEC_NSEC_FOUND,
+ DNSSEC_NSEC_OPTOUT,
} DnssecNsecResult;
int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result);
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index c34ecc44f8..14faf9e4ab 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -1455,9 +1455,9 @@ fail:
return r;
}
-int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) {
+int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, bool *ret_cache_flush, size_t *start) {
_cleanup_free_ char *name = NULL;
- bool cache_flush = true;
+ bool cache_flush = false;
uint16_t class, type;
DnsResourceKey *key;
size_t saved_rindex;
@@ -1483,10 +1483,10 @@ int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) {
if (p->protocol == DNS_PROTOCOL_MDNS) {
/* See RFC6762, Section 10.2 */
- if (class & MDNS_RR_CACHE_FLUSH)
+ if (type != DNS_TYPE_OPT && (class & MDNS_RR_CACHE_FLUSH)) {
class &= ~MDNS_RR_CACHE_FLUSH;
- else
- cache_flush = false;
+ cache_flush = true;
+ }
}
key = dns_resource_key_new_consume(class, type, name);
@@ -1495,11 +1495,11 @@ int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) {
goto fail;
}
- key->cache_flush = cache_flush;
-
name = NULL;
*ret = key;
+ if (ret_cache_flush)
+ *ret_cache_flush = cache_flush;
if (start)
*start = saved_rindex;
@@ -1515,11 +1515,12 @@ static bool loc_size_ok(uint8_t size) {
return m <= 9 && e <= 9 && (m > 0 || e == 0);
}
-int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
+int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, bool *ret_cache_flush, size_t *start) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
size_t saved_rindex, offset;
uint16_t rdlength;
+ bool cache_flush;
int r;
assert(p);
@@ -1527,11 +1528,11 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
saved_rindex = p->rindex;
- r = dns_packet_read_key(p, &key, NULL);
+ r = dns_packet_read_key(p, &key, &cache_flush, NULL);
if (r < 0)
goto fail;
- if (key->class == DNS_CLASS_ANY ||
+ if (!dns_class_is_valid_rr(key->class)||
!dns_type_is_valid_rr(key->type)) {
r = -EBADMSG;
goto fail;
@@ -1939,6 +1940,8 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
*ret = rr;
rr = NULL;
+ if (ret_cache_flush)
+ *ret_cache_flush = cache_flush;
if (start)
*start = saved_rindex;
@@ -1971,11 +1974,17 @@ int dns_packet_extract(DnsPacket *p) {
for (i = 0; i < n; i++) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
+ bool cache_flush;
- r = dns_packet_read_key(p, &key, NULL);
+ r = dns_packet_read_key(p, &key, &cache_flush, NULL);
if (r < 0)
goto finish;
+ if (cache_flush) {
+ r = -EBADMSG;
+ goto finish;
+ }
+
if (!dns_type_is_valid_query(key->type)) {
r = -EBADMSG;
goto finish;
@@ -1997,13 +2006,19 @@ int dns_packet_extract(DnsPacket *p) {
for (i = 0; i < n; i++) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+ bool cache_flush;
- r = dns_packet_read_rr(p, &rr, NULL);
+ r = dns_packet_read_rr(p, &rr, &cache_flush, NULL);
if (r < 0)
goto finish;
if (rr->key->type == DNS_TYPE_OPT) {
+ if (!dns_name_is_root(DNS_RESOURCE_KEY_NAME(rr->key))) {
+ r = -EBADMSG;
+ goto finish;
+ }
+
/* The OPT RR is only valid in the Additional section */
if (i < DNS_PACKET_ANCOUNT(p) + DNS_PACKET_NSCOUNT(p)) {
r = -EBADMSG;
@@ -2018,7 +2033,18 @@ int dns_packet_extract(DnsPacket *p) {
p->opt = dns_resource_record_ref(rr);
} else {
- r = dns_answer_add(answer, rr, p->ifindex);
+
+ /* According to RFC 4795, section
+ * 2.9. only the RRs from the Answer
+ * section shall be cached. Hence mark
+ * only those RRs as cacheable by
+ * default, but not the ones from the
+ * Additional or Authority
+ * sections. */
+
+ r = dns_answer_add(answer, rr, p->ifindex,
+ (i < DNS_PACKET_ANCOUNT(p) ? DNS_ANSWER_CACHEABLE : 0) |
+ (p->protocol == DNS_PROTOCOL_MDNS && !cache_flush ? DNS_ANSWER_SHARED_OWNER : 0));
if (r < 0)
goto finish;
}
diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index 082e92833c..36da86dee5 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -185,8 +185,8 @@ int dns_packet_read_uint32(DnsPacket *p, uint32_t *ret, size_t *start);
int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start);
int dns_packet_read_raw_string(DnsPacket *p, const void **ret, size_t *size, size_t *start);
int dns_packet_read_name(DnsPacket *p, char **ret, bool allow_compression, size_t *start);
-int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start);
-int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start);
+int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, bool *ret_cache_flush, size_t *start);
+int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, bool *ret_cache_flush, size_t *start);
void dns_packet_rewind(DnsPacket *p, size_t idx);
diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c
index 405882a6ea..18d2d01bf2 100644
--- a/src/resolve/resolved-dns-query.c
+++ b/src/resolve/resolved-dns-query.c
@@ -554,7 +554,7 @@ static int synthesize_localhost_rr(DnsQuery *q, DnsResourceKey *key, DnsAnswer *
rr->a.in_addr.s_addr = htobe32(INADDR_LOOPBACK);
- r = dns_answer_add(*answer, rr, SYNTHESIZE_IFINDEX(q->ifindex));
+ r = dns_answer_add(*answer, rr, SYNTHESIZE_IFINDEX(q->ifindex), DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
}
@@ -568,7 +568,7 @@ static int synthesize_localhost_rr(DnsQuery *q, DnsResourceKey *key, DnsAnswer *
rr->aaaa.in6_addr = in6addr_loopback;
- r = dns_answer_add(*answer, rr, SYNTHESIZE_IFINDEX(q->ifindex));
+ r = dns_answer_add(*answer, rr, SYNTHESIZE_IFINDEX(q->ifindex), DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
}
@@ -576,7 +576,7 @@ static int synthesize_localhost_rr(DnsQuery *q, DnsResourceKey *key, DnsAnswer *
return 0;
}
-static int answer_add_ptr(DnsAnswer **answer, const char *from, const char *to, int ifindex) {
+static int answer_add_ptr(DnsAnswer **answer, const char *from, const char *to, int ifindex, DnsAnswerFlags flags) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR, from);
@@ -587,7 +587,7 @@ static int answer_add_ptr(DnsAnswer **answer, const char *from, const char *to,
if (!rr->ptr.name)
return -ENOMEM;
- return dns_answer_add(*answer, rr, ifindex);
+ return dns_answer_add(*answer, rr, ifindex, flags);
}
static int synthesize_localhost_ptr(DnsQuery *q, DnsResourceKey *key, DnsAnswer **answer) {
@@ -597,12 +597,12 @@ static int synthesize_localhost_ptr(DnsQuery *q, DnsResourceKey *key, DnsAnswer
assert(key);
assert(answer);
- r = dns_answer_reserve(answer, 1);
- if (r < 0)
- return r;
-
if (IN_SET(key->type, DNS_TYPE_PTR, DNS_TYPE_ANY)) {
- r = answer_add_ptr(answer, DNS_RESOURCE_KEY_NAME(key), "localhost", SYNTHESIZE_IFINDEX(q->ifindex));
+ r = dns_answer_reserve(answer, 1);
+ if (r < 0)
+ return r;
+
+ r = answer_add_ptr(answer, DNS_RESOURCE_KEY_NAME(key), "localhost", SYNTHESIZE_IFINDEX(q->ifindex), DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
}
@@ -633,7 +633,7 @@ static int answer_add_addresses_rr(
if (r < 0)
return r;
- r = dns_answer_add(*answer, rr, addresses[j].ifindex);
+ r = dns_answer_add(*answer, rr, addresses[j].ifindex, DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
}
@@ -674,7 +674,7 @@ static int answer_add_addresses_ptr(
if (r < 0)
return r;
- r = dns_answer_add(*answer, rr, addresses[j].ifindex);
+ r = dns_answer_add(*answer, rr, addresses[j].ifindex, DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
}
@@ -740,15 +740,15 @@ static int synthesize_system_hostname_ptr(DnsQuery *q, int af, const union in_ad
if (r < 0)
return r;
- r = answer_add_ptr(answer, "2.0.0.127.in-addr.arpa", q->manager->llmnr_hostname, SYNTHESIZE_IFINDEX(q->ifindex));
+ r = answer_add_ptr(answer, "2.0.0.127.in-addr.arpa", q->manager->llmnr_hostname, SYNTHESIZE_IFINDEX(q->ifindex), DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
- r = answer_add_ptr(answer, "2.0.0.127.in-addr.arpa", q->manager->mdns_hostname, SYNTHESIZE_IFINDEX(q->ifindex));
+ r = answer_add_ptr(answer, "2.0.0.127.in-addr.arpa", q->manager->mdns_hostname, SYNTHESIZE_IFINDEX(q->ifindex), DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
- r = answer_add_ptr(answer, "2.0.0.127.in-addr.arpa", "localhost", SYNTHESIZE_IFINDEX(q->ifindex));
+ r = answer_add_ptr(answer, "2.0.0.127.in-addr.arpa", "localhost", SYNTHESIZE_IFINDEX(q->ifindex), DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
@@ -810,7 +810,7 @@ static int dns_query_synthesize_reply(DnsQuery *q, DnsTransactionState *state) {
/* Tries to synthesize localhost RR replies where appropriate */
if (!IN_SET(*state,
- DNS_TRANSACTION_FAILURE,
+ DNS_TRANSACTION_RCODE_FAILURE,
DNS_TRANSACTION_NO_SERVERS,
DNS_TRANSACTION_TIMEOUT,
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED))
@@ -986,6 +986,7 @@ fail:
static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) {
DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS;
bool has_authenticated = false, has_non_authenticated = false;
+ DnssecResult dnssec_result_authenticated = _DNSSEC_RESULT_INVALID, dnssec_result_non_authenticated = _DNSSEC_RESULT_INVALID;
DnsTransaction *t;
Iterator i;
int r;
@@ -1009,12 +1010,16 @@ static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) {
dns_query_complete(q, DNS_TRANSACTION_RESOURCES);
return;
}
+
q->answer_rcode = t->answer_rcode;
- if (t->answer_authenticated)
+ if (t->answer_authenticated) {
has_authenticated = true;
- else
+ dnssec_result_authenticated = t->answer_dnssec_result;
+ } else {
has_non_authenticated = true;
+ dnssec_result_non_authenticated = t->answer_dnssec_result;
+ }
state = DNS_TRANSACTION_SUCCESS;
break;
@@ -1031,22 +1036,26 @@ static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) {
/* Any kind of failure? Store the data away,
* if there's nothing stored yet. */
- if (state != DNS_TRANSACTION_SUCCESS) {
-
- dns_answer_unref(q->answer);
- q->answer = dns_answer_ref(t->answer);
- q->answer_rcode = t->answer_rcode;
+ if (state == DNS_TRANSACTION_SUCCESS)
+ continue;
- state = t->state;
- }
+ dns_answer_unref(q->answer);
+ q->answer = dns_answer_ref(t->answer);
+ q->answer_rcode = t->answer_rcode;
+ q->answer_dnssec_result = t->answer_dnssec_result;
+ state = t->state;
break;
}
}
+ if (state == DNS_TRANSACTION_SUCCESS) {
+ q->answer_authenticated = has_authenticated && !has_non_authenticated;
+ q->answer_dnssec_result = q->answer_authenticated ? dnssec_result_authenticated : dnssec_result_non_authenticated;
+ }
+
q->answer_protocol = c->scope->protocol;
q->answer_family = c->scope->family;
- q->answer_authenticated = has_authenticated && !has_non_authenticated;
dns_search_domain_unref(q->answer_search_domain);
q->answer_search_domain = dns_search_domain_ref(c->search_domain);
diff --git a/src/resolve/resolved-dns-query.h b/src/resolve/resolved-dns-query.h
index d7f96c3ca4..44edd5bfff 100644
--- a/src/resolve/resolved-dns-query.h
+++ b/src/resolve/resolved-dns-query.h
@@ -72,10 +72,11 @@ struct DnsQuery {
/* Discovered data */
DnsAnswer *answer;
int answer_rcode;
+ DnssecResult answer_dnssec_result;
+ bool answer_authenticated;
DnsProtocol answer_protocol;
int answer_family;
DnsSearchDomain *answer_search_domain;
- bool answer_authenticated;
/* Bus client information */
sd_bus_message *request;
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 74c9d87319..98a3a3351d 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -184,7 +184,7 @@ int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) {
return 1;
}
-int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain) {
+int dns_resource_key_match_rr(const DnsResourceKey *key, DnsResourceRecord *rr, const char *search_domain) {
int r;
assert(key);
@@ -1074,34 +1074,6 @@ int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) {
return 0;
}
-const char *dns_class_to_string(uint16_t class) {
-
- switch (class) {
-
- case DNS_CLASS_IN:
- return "IN";
-
- case DNS_CLASS_ANY:
- return "ANY";
- }
-
- return NULL;
-}
-
-int dns_class_from_string(const char *s, uint16_t *class) {
- assert(s);
- assert(class);
-
- if (strcaseeq(s, "IN"))
- *class = DNS_CLASS_IN;
- else if (strcaseeq(s, "ANY"))
- *class = DNS_CLASS_ANY;
- else
- return -EINVAL;
-
- return 0;
-}
-
DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i) {
DnsTxtItem *n;
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index 632ee59994..a35f01ce10 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -33,14 +33,6 @@ typedef struct DnsResourceKey DnsResourceKey;
typedef struct DnsResourceRecord DnsResourceRecord;
typedef struct DnsTxtItem DnsTxtItem;
-/* DNS record classes, see RFC 1035 */
-enum {
- DNS_CLASS_IN = 0x01,
- DNS_CLASS_ANY = 0xFF,
- _DNS_CLASS_MAX,
- _DNS_CLASS_INVALID = -1
-};
-
/* DNSKEY RR flags */
#define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8)
#define DNSKEY_FLAG_SEP (UINT16_C(1) << 0)
@@ -79,7 +71,6 @@ struct DnsResourceKey {
unsigned n_ref;
uint16_t class, type;
char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
- bool cache_flush:1;
};
/* Creates a temporary resource key. This is only useful to quickly
@@ -245,7 +236,7 @@ DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
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_rr(const DnsResourceKey *key, DnsResourceRecord *rr, const char *search_domain);
int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, 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);
@@ -270,9 +261,6 @@ int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical);
DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i);
bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b);
-const char *dns_class_to_string(uint16_t type);
-int dns_class_from_string(const char *name, uint16_t *class);
-
extern const struct hash_ops dns_resource_key_hash_ops;
const char* dnssec_algorithm_to_string(int i) _const_;
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 5bd733a8ff..b284cb8b27 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -81,7 +81,8 @@ static void dns_scope_abort_transactions(DnsScope *s) {
* freed while we still look at it */
t->block_gc++;
- dns_transaction_complete(t, DNS_TRANSACTION_ABORTED);
+ if (DNS_TRANSACTION_IS_LIVE(t->state))
+ dns_transaction_complete(t, DNS_TRANSACTION_ABORTED);
t->block_gc--;
dns_transaction_free(t);
@@ -789,7 +790,7 @@ DnsTransaction *dns_scope_find_transaction(DnsScope *scope, DnsResourceKey *key,
/* Refuse reusing transactions that completed based on cached
* data instead of a real packet, if that's requested. */
if (!cache_ok &&
- IN_SET(t->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_FAILURE) &&
+ IN_SET(t->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_RCODE_FAILURE) &&
t->answer_source != DNS_TRANSACTION_NETWORK)
return NULL;
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index f09788b0c6..32d52d8192 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -80,6 +80,7 @@ DnsTransaction* dns_transaction_free(DnsTransaction *t) {
dns_answer_unref(t->validated_keys);
+ free(t->key_string);
free(t);
return NULL;
}
@@ -128,7 +129,7 @@ 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->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
t->key = dns_resource_key_ref(key);
/* Find a fresh, unused transaction id */
@@ -182,7 +183,9 @@ static void dns_transaction_tentative(DnsTransaction *t, DnsPacket *p) {
in_addr_to_string(p->family, &p->sender, &pretty);
- log_debug("Transaction on scope %s on %s/%s got tentative packet from %s",
+ log_debug("Transaction %" PRIu16 " for <%s> on scope %s on %s/%s got tentative packet from %s.",
+ t->id,
+ dns_transaction_key_string(t),
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),
@@ -225,12 +228,15 @@ void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) {
* should hence not attempt to access the query or transaction
* after calling this function. */
- log_debug("Transaction on scope %s on %s/%s now complete with <%s> from %s",
+ log_debug("Transaction %" PRIu16 " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s).",
+ t->id,
+ dns_transaction_key_string(t),
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),
dns_transaction_state_to_string(state),
- t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source));
+ t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source),
+ t->answer_authenticated ? "authenticated" : "unsigned");
t->state = state;
@@ -239,14 +245,42 @@ 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->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--;
+ if (!set_isempty(t->notify_transactions)) {
+ DnsTransaction **nt;
+ unsigned j, n = 0;
+
+ /* We need to be careful when notifying other
+ * transactions, as that might destroy other
+ * transactions in our list. Hence, in order to be
+ * able to safely iterate through the list of
+ * transactions, take a GC lock on all of them
+ * first. Then, in a second loop, notify them, but
+ * first unlock that specific transaction. */
+
+ nt = newa(DnsTransaction*, set_size(t->notify_transactions));
+ SET_FOREACH(d, t->notify_transactions, i) {
+ nt[n++] = d;
+ d->block_gc++;
+ }
+
+ assert(n == set_size(t->notify_transactions));
+
+ for (j = 0; j < n; j++) {
+ if (set_contains(t->notify_transactions, nt[j]))
+ dns_transaction_notify(nt[j], t);
+
+ nt[j]->block_gc--;
+ dns_transaction_gc(nt[j]);
+ }
+ }
+
+ t->block_gc--;
dns_transaction_gc(t);
}
@@ -351,7 +385,6 @@ static int dns_transaction_open_tcp(DnsTransaction *t) {
t->server = dns_server_ref(server);
t->received = dns_packet_unref(t->received);
t->answer = dns_answer_unref(t->answer);
- t->n_answer_cacheable = 0;
t->answer_rcode = 0;
t->stream->complete = on_stream_complete;
t->stream->transaction = t;
@@ -394,20 +427,32 @@ static void dns_transaction_cache_answer(DnsTransaction *t) {
t->key,
t->answer_rcode,
t->answer,
- t->n_answer_cacheable,
t->answer_authenticated,
0,
t->received->family,
&t->received->sender);
}
+static bool dns_transaction_dnssec_is_live(DnsTransaction *t) {
+ DnsTransaction *dt;
+ Iterator i;
+
+ assert(t);
+
+ SET_FOREACH(dt, t->dnssec_transactions, i)
+ if (DNS_TRANSACTION_IS_LIVE(dt->state))
+ return true;
+
+ return false;
+}
+
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))
+ if (dns_transaction_dnssec_is_live(t))
return;
/* All our auxiliary DNSSEC transactions are complete now. Try
@@ -418,7 +463,10 @@ static void dns_transaction_process_dnssec(DnsTransaction *t) {
return;
}
- if (!IN_SET(t->dnssec_result, _DNSSEC_RESULT_INVALID, DNSSEC_VALIDATED, DNSSEC_NO_SIGNATURE /* FOR NOW! */)) {
+ if (!IN_SET(t->answer_dnssec_result,
+ _DNSSEC_RESULT_INVALID, /* No DNSSEC validation enabled */
+ DNSSEC_VALIDATED, /* Answer is signed and validated successfully */
+ DNSSEC_UNSIGNED)) { /* Answer is right-fully unsigned */
dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED);
return;
}
@@ -428,7 +476,7 @@ static void dns_transaction_process_dnssec(DnsTransaction *t) {
if (t->answer_rcode == DNS_RCODE_SUCCESS)
dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS);
else
- dns_transaction_complete(t, DNS_TRANSACTION_FAILURE);
+ dns_transaction_complete(t, DNS_TRANSACTION_RCODE_FAILURE);
}
void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
@@ -606,16 +654,7 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
dns_answer_unref(t->answer);
t->answer = dns_answer_ref(p->answer);
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. However,
- * if we know the message is authenticated, we might
- * as well cache everything. */
- if (t->answer_authenticated)
- t->n_answer_cacheable = (unsigned) -1; /* everything! */
- else
- t->n_answer_cacheable = DNS_PACKET_ANCOUNT(t->received); /* only the answer section */
+ t->answer_authenticated = false;
r = dns_transaction_request_dnssec_keys(t);
if (r < 0) {
@@ -625,6 +664,7 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
if (r > 0) {
/* There are DNSSEC transactions pending now. Update the state accordingly. */
t->state = DNS_TRANSACTION_VALIDATING;
+ dns_transaction_stop(t);
return;
}
}
@@ -714,6 +754,8 @@ static int on_transaction_timeout(sd_event_source *s, usec_t usec, void *userdat
t->initial_jitter_elapsed = true;
}
+ log_debug("Timeout reached on transaction %" PRIu16 ".", t->id);
+
/* ...and try again with a new server */
dns_transaction_next_dns_server(t);
@@ -769,7 +811,6 @@ static int dns_transaction_prepare(DnsTransaction *t, usec_t ts) {
t->start_usec = ts;
t->received = dns_packet_unref(t->received);
t->answer = dns_answer_unref(t->answer);
- t->n_answer_cacheable = 0;
t->answer_rcode = 0;
t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID;
@@ -823,7 +864,7 @@ static int dns_transaction_prepare(DnsTransaction *t, usec_t ts) {
if (t->answer_rcode == DNS_RCODE_SUCCESS)
dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS);
else
- dns_transaction_complete(t, DNS_TRANSACTION_FAILURE);
+ dns_transaction_complete(t, DNS_TRANSACTION_RCODE_FAILURE);
return 0;
}
}
@@ -980,17 +1021,12 @@ int dns_transaction_go(DnsTransaction *t) {
if (r <= 0)
return r;
- 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));
- }
+ log_debug("Excercising transaction %" PRIu16 " for <%s> on scope %s on %s/%s.",
+ t->id,
+ dns_transaction_key_string(t),
+ 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 ||
@@ -1149,6 +1185,12 @@ static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *
assert(t);
assert(key);
+ r = dns_resource_key_equal(t->key, key);
+ if (r < 0)
+ return r;
+ if (r > 0) /* Don't go in circles */
+ return 0;
+
/* Try to get the data from the trust anchor */
r = dns_trust_anchor_lookup(&t->scope->manager->trust_anchor, key, &a);
if (r < 0)
@@ -1175,17 +1217,118 @@ static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *
return 0;
}
+static int dns_transaction_has_positive_answer(DnsTransaction *t, DnsAnswerFlags *flags) {
+ int r;
+
+ assert(t);
+
+ /* Checks whether the answer is positive, i.e. either a direct
+ * answer to the question, or a CNAME/DNAME for it */
+
+ r = dns_answer_match_key(t->answer, t->key, flags);
+ if (r != 0)
+ return r;
+
+ r = dns_answer_find_cname_or_dname(t->answer, t->key, NULL, flags);
+ if (r != 0)
+ return r;
+
+ return false;
+}
+
+static int dns_transaction_has_unsigned_negative_answer(DnsTransaction *t) {
+ int r;
+
+ assert(t);
+
+ /* Checks whether the answer is negative, and lacks NSEC/NSEC3
+ * RRs to prove it */
+
+ r = dns_transaction_has_positive_answer(t, NULL);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return false;
+
+ /* The answer does not contain any RRs that match to the
+ * question. If so, let's see if there are any NSEC/NSEC3 RRs
+ * included. If not, the answer is unsigned. */
+
+ r = dns_answer_contains_nsec_or_nsec3(t->answer);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return false;
+
+ return true;
+}
+
+static int dns_transaction_is_primary_response(DnsTransaction *t, DnsResourceRecord *rr) {
+ int r;
+
+ assert(t);
+ assert(rr);
+
+ /* Check if the specified RR is the "primary" response,
+ * i.e. either matches the question precisely or is a
+ * CNAME/DNAME for it, or is any kind of NSEC/NSEC3 RR */
+
+ r = dns_resource_key_match_rr(t->key, rr, NULL);
+ if (r != 0)
+ return r;
+
+ r = dns_resource_key_match_cname_or_dname(t->key, rr->key, NULL);
+ if (r != 0)
+ return r;
+
+ if (rr->key->type == DNS_TYPE_NSEC3) {
+ const char *p;
+
+ p = DNS_RESOURCE_KEY_NAME(rr->key);
+ r = dns_name_parent(&p);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(t->key), p);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return true;
+ }
+ }
+
+ return rr->key->type == DNS_TYPE_NSEC;
+}
+
int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
DnsResourceRecord *rr;
+
int r;
assert(t);
+ /*
+ * Retrieve all auxiliary RRs for the answer we got, so that
+ * we can verify signatures or prove that RRs are rightfully
+ * unsigned. Specifically:
+ *
+ * - 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 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
+ */
+
if (t->scope->dnssec_mode != DNSSEC_YES)
return 0;
DNS_ANSWER_FOREACH(rr, t->answer) {
+ if (dns_type_is_pseudo(rr->key->type))
+ continue;
+
switch (rr->key->type) {
case DNS_TYPE_RRSIG: {
@@ -1204,10 +1347,18 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
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 the signer is not a parent of our
+ * original query, then this is about an
+ * auxiliary RRset, but not anything we asked
+ * for. In this case we aren't interested,
+ * because we don't want to request additional
+ * RRs for stuff we didn't really ask for, and
+ * also to avoid request loops, where
+ * additional RRs from one transaction result
+ * in another transaction whose additonal RRs
+ * point back to the original transaction, and
+ * we deadlock. */
+ r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(t->key), rr->rrsig.signer);
if (r < 0)
return r;
if (r == 0)
@@ -1217,8 +1368,7 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
if (!dnskey)
return -ENOMEM;
- log_debug("Requesting DNSKEY to validate transaction %" PRIu16" (key tag: %" PRIu16 ").", t->id, rr->rrsig.key_tag);
-
+ log_debug("Requesting DNSKEY to validate transaction %" PRIu16" (%s, RRSIG with key tag: %" PRIu16 ").", t->id, DNS_RESOURCE_KEY_NAME(rr->key), rr->rrsig.key_tag);
r = dns_transaction_request_dnssec_rr(t, dnskey);
if (r < 0)
return r;
@@ -1229,79 +1379,260 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
/* For each DNSKEY we request the matching DS */
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *ds = NULL;
+ /* If the DNSKEY we are looking at is not for
+ * zone we are interested in, nor any of its
+ * parents, we aren't interested, and don't
+ * request it. After all, we don't want to end
+ * up in request loops, and want to keep
+ * additional traffic down. */
+
+ r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(t->key), DNS_RESOURCE_KEY_NAME(rr->key));
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
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));
+ log_debug("Requesting DS to validate transaction %" PRIu16" (%s, DNSKEY with key tag: %" PRIu16 ").", t->id, DNS_RESOURCE_KEY_NAME(rr->key), dnssec_keytag(rr));
+ r = dns_transaction_request_dnssec_rr(t, ds);
+ if (r < 0)
+ return r;
+
+ 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;
+
+ /* For an unsigned SOA or NS, try to acquire
+ * the matching DS RR, as we are at a zone cut
+ * then, and whether a DS exists tells us
+ * whether the zone is signed. Do so only if
+ * this RR matches our original question,
+ * however. */
+
+ r = dns_resource_key_match_rr(t->key, rr, NULL);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ r = dnssec_has_rrsig(t->answer, rr->key);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
+
+ 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 " (%s, unsigned SOA/NS RRset).", t->id, DNS_RESOURCE_KEY_NAME(rr->key));
r = dns_transaction_request_dnssec_rr(t, ds);
if (r < 0)
return r;
break;
+ }
+
+ case DNS_TYPE_CNAME:
+ case DNS_TYPE_DNAME: {
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *soa = NULL;
+ const char *name;
+
+ /* CNAMEs and DNAMEs cannot be located at a
+ * zone apex, hence ask for the parent SOA for
+ * unsigned CNAME/DNAME RRs, maybe that's the
+ * apex. But do all that only if this is
+ * actually a response to our original
+ * question. */
+
+ r = dns_transaction_is_primary_response(t, rr);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ r = dnssec_has_rrsig(t->answer, rr->key);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
+
+ name = DNS_RESOURCE_KEY_NAME(rr->key);
+ r = dns_name_parent(&name);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ soa = dns_resource_key_new(rr->key->class, DNS_TYPE_SOA, name);
+ 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));
+ r = dns_transaction_request_dnssec_rr(t, soa);
+ if (r < 0)
+ return r;
+
+ break;
+ }
+
+ 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
+ * question. */
+
+ r = dns_transaction_is_primary_response(t, rr);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ r = dnssec_has_rrsig(t->answer, rr->key);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
+
+ soa = dns_resource_key_new(rr->key->class, DNS_TYPE_SOA, DNS_RESOURCE_KEY_NAME(rr->key));
+ if (!soa)
+ return -ENOMEM;
+
+ log_debug("Requesting SOA to validate transaction %" PRIu16 " (%s, unsigned non-SOA/NS RRset).", t->id, DNS_RESOURCE_KEY_NAME(rr->key));
+ r = dns_transaction_request_dnssec_rr(t, soa);
+ if (r < 0)
+ return r;
+ break;
}}
}
- return !set_isempty(t->dnssec_transactions);
+ /* Above, we requested everything necessary to validate what
+ * we got. Now, let's request what we need to validate what we
+ * didn't get... */
+
+ r = dns_transaction_has_unsigned_negative_answer(t);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ const char *name;
+
+ name = DNS_RESOURCE_KEY_NAME(t->key);
+
+ /* If this was a SOA or NS request, then this
+ * indicates that we are not at a zone apex, hence ask
+ * the parent name instead. If this was a DS request,
+ * then it's signed when the parent zone is signed,
+ * hence ask the parent in that case, too. */
+
+ if (IN_SET(t->key->type, DNS_TYPE_SOA, DNS_TYPE_NS, DNS_TYPE_DS)) {
+ r = dns_name_parent(&name);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ log_debug("Requesting parent SOA to validate transaction %" PRIu16 " (%s, unsigned empty SOA/NS/DS response).", t->id, DNS_RESOURCE_KEY_NAME(t->key));
+ else
+ name = NULL;
+ } else
+ log_debug("Requesting SOA to validate transaction %" PRIu16 " (%s, unsigned empty non-SOA/NS/DS response).", t->id, DNS_RESOURCE_KEY_NAME(t->key));
+
+ if (name) {
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *soa = NULL;
+
+ soa = dns_resource_key_new(t->key->class, DNS_TYPE_SOA, name);
+ if (!soa)
+ return -ENOMEM;
+
+ r = dns_transaction_request_dnssec_rr(t, soa);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ return dns_transaction_dnssec_is_live(t);
}
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);
+ if (!IN_SET(t->state, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING))
+ return;
+
/* Invoked whenever any of our auxiliary DNSSEC transactions
- completed its work. We simply copy the answer from that
- transaction over. */
+ completed its work. We copy any RRs from that transaction
+ over into our list of validated keys -- but only if the
+ answer is authenticated.
- 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;
- }
- }
+ 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. */
- /* Detach us from the DNSSEC transaction. */
- (void) set_remove(t->dnssec_transactions, source);
- (void) set_remove(source->notify_transactions, t);
+ switch (source->state) {
- /* 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);
-}
+ case DNS_TRANSACTION_DNSSEC_FAILED:
-static int dns_transaction_is_primary_response(DnsTransaction *t, DnsResourceRecord *rr) {
- int r;
+ 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;
- assert(t);
- assert(rr);
+ case DNS_TRANSACTION_RCODE_FAILURE:
- /* Check if the specified RR is the "primary" response,
- * i.e. either matches the question precisely or is a
- * CNAME/DNAME for it, or is any kind of NSEC/NSEC3 RR */
+ if (source->answer_rcode != DNS_RCODE_NXDOMAIN) {
+ log_debug("Auxiliary DNSSEC RR query failed with rcode=%i.", source->answer_rcode);
+ goto fail;
+ }
- if (IN_SET(rr->key->type, DNS_TYPE_NSEC, DNS_TYPE_NSEC3))
- return 1;
+ /* fall-through: NXDOMAIN is good enough for us */
- r = dns_resource_key_match_rr(t->key, rr, NULL);
- if (r != 0)
- return r;
+ 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;
+ }
+ }
- r = dns_resource_key_match_cname_or_dname(t->key, rr->key, NULL);
- if (r != 0)
- return r;
+ /* 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;
- return 0;
+ 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);
}
static int dns_transaction_validate_dnskey_by_ds(DnsTransaction *t) {
@@ -1311,8 +1642,8 @@ static int dns_transaction_validate_dnskey_by_ds(DnsTransaction *t) {
assert(t);
/* Add all DNSKEY RRs from the answer that are validated by DS
- * RRs from the list of validated keys to the lis of validated
- * keys. */
+ * RRs from the list of validated keys to the list of
+ * validated keys. */
DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, t->answer) {
@@ -1323,7 +1654,7 @@ static int dns_transaction_validate_dnskey_by_ds(DnsTransaction *t) {
continue;
/* If so, the DNSKEY is validated too. */
- r = dns_answer_add_extend(&t->validated_keys, rr, ifindex);
+ r = dns_answer_add_extend(&t->validated_keys, rr, ifindex, DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
}
@@ -1331,10 +1662,204 @@ static int dns_transaction_validate_dnskey_by_ds(DnsTransaction *t) {
return 0;
}
+static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *rr) {
+ int r;
+
+ assert(t);
+ assert(rr);
+
+ /* Checks if the RR we are looking for must be signed with an
+ * RRSIG. This is used for positive responses. */
+
+ if (t->scope->dnssec_mode != DNSSEC_YES)
+ return false;
+
+ if (dns_type_is_pseudo(rr->key->type))
+ return -EINVAL;
+
+ 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;
+
+ case DNS_TYPE_SOA:
+ case DNS_TYPE_NS: {
+ DnsTransaction *dt;
+ Iterator i;
+
+ /* For SOA or NS RRs we look for a matching DS transaction, or a SOA transaction of the parent */
+
+ SET_FOREACH(dt, t->dnssec_transactions, i) {
+
+ if (dt->key->class != rr->key->class)
+ continue;
+ if (dt->key->type != DNS_TYPE_DS)
+ continue;
+
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), DNS_RESOURCE_KEY_NAME(rr->key));
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ /* We found a DS transactions for the SOA/NS
+ * RRs we are looking at. If it discovered signed DS
+ * RRs, then we need to be signed, too. */
+
+ if (!dt->answer_authenticated)
+ return false;
+
+ return dns_answer_match_key(dt->answer, dt->key, NULL);
+ }
+
+ /* We found nothing that proves this is safe to leave
+ * this unauthenticated, hence ask inist on
+ * authentication. */
+ return true;
+ }
+
+ 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. */
+
+ SET_FOREACH(dt, t->dnssec_transactions, i) {
+
+ if (dt->key->class != rr->key->class)
+ continue;
+ if (dt->key->type != DNS_TYPE_SOA)
+ continue;
+
+ if (!parent) {
+ parent = DNS_RESOURCE_KEY_NAME(rr->key);
+ r = dns_name_parent(&parent);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ /* A CNAME/DNAME without a parent? That's sooo weird. */
+ log_debug("Transaction %" PRIu16 " claims CNAME/DNAME at root. Refusing.", t->id);
+ return -EBADMSG;
+ }
+ }
+
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), parent);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ return t->answer_authenticated;
+ }
+
+ return true;
+ }
+
+ default: {
+ DnsTransaction *dt;
+ Iterator i;
+
+ /* Any other kind of RR. Let's see if our SOA lookup was authenticated */
+
+ SET_FOREACH(dt, t->dnssec_transactions, i) {
+
+ if (dt->key->class != rr->key->class)
+ continue;
+ if (dt->key->type != DNS_TYPE_SOA)
+ continue;
+
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), DNS_RESOURCE_KEY_NAME(rr->key));
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ /* We found the transaction that was supposed to find
+ * the SOA RR for us. It was successful, but found no
+ * RR for us. This means we are not at a zone cut. In
+ * this case, we require authentication if the SOA
+ * lookup was authenticated too. */
+ return t->answer_authenticated;
+ }
+
+ return true;
+ }}
+}
+
+static int dns_transaction_requires_nsec(DnsTransaction *t) {
+ DnsTransaction *dt;
+ const char *name;
+ Iterator i;
+ int r;
+
+ assert(t);
+
+ /* Checks if we need to insist on NSEC/NSEC3 RRs for proving
+ * this negative reply */
+
+ if (t->scope->dnssec_mode != DNSSEC_YES)
+ return false;
+
+ if (dns_type_is_pseudo(t->key->type))
+ return -EINVAL;
+
+ name = DNS_RESOURCE_KEY_NAME(t->key);
+
+ if (IN_SET(t->key->type, DNS_TYPE_SOA, DNS_TYPE_NS, DNS_TYPE_DS)) {
+
+ /* We got a negative reply for this SOA/NS lookup? If
+ * so, then we are not at a zone apex, and thus should
+ * look at the result of the parent SOA lookup.
+ *
+ * We got a negative reply for this DS lookup? DS RRs
+ * are signed when their parent zone is signed, hence
+ * also check the parent SOA in this case. */
+
+ r = dns_name_parent(&name);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return true;
+ }
+
+ /* For all other RRs we check the SOA on the same level to see
+ * if it's signed. */
+
+ SET_FOREACH(dt, t->dnssec_transactions, i) {
+
+ if (dt->key->class != t->key->class)
+ continue;
+ if (dt->key->type != DNS_TYPE_SOA)
+ continue;
+
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), name);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ return dt->answer_authenticated;
+ }
+
+ /* If in doubt, require NSEC/NSEC3 */
+ return true;
+}
+
int dns_transaction_validate_dnssec(DnsTransaction *t) {
_cleanup_(dns_answer_unrefp) DnsAnswer *validated = NULL;
bool dnskeys_finalized = false;
DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
int r;
assert(t);
@@ -1347,21 +1872,21 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
return 0;
/* Already validated */
- if (t->dnssec_result != _DNSSEC_RESULT_INVALID)
+ if (t->answer_dnssec_result != _DNSSEC_RESULT_INVALID)
return 0;
+ /* Our own stuff needs no validation */
if (IN_SET(t->answer_source, DNS_TRANSACTION_ZONE, DNS_TRANSACTION_TRUST_ANCHOR)) {
- t->dnssec_result = DNSSEC_VALIDATED;
+ t->answer_dnssec_result = DNSSEC_VALIDATED;
t->answer_authenticated = true;
return 0;
}
- if (log_get_max_level() >= LOG_DEBUG) {
- _cleanup_free_ char *ks = NULL;
+ /* Cached stuff is not affected by validation. */
+ if (t->answer_source != DNS_TRANSACTION_NETWORK)
+ return 0;
- (void) dns_resource_key_to_string(t->key, &ks);
- log_debug("Validating response from transaction %" PRIu16 " (%s).", t->id, ks ? strstrip(ks) : "???");
- }
+ log_debug("Validating response from transaction %" PRIu16 " (%s).", t->id, dns_transaction_key_string(t));
/* First see if there are DNSKEYs we already known a validated DS for. */
r = dns_transaction_validate_dnskey_by_ds(t);
@@ -1390,11 +1915,6 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
if (result == 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
@@ -1402,13 +1922,17 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
* of validated keys for this
* transaction. */
- r = dns_answer_copy_by_key(&t->validated_keys, t->answer, rr->key);
+ r = dns_answer_copy_by_key(&t->validated_keys, t->answer, rr->key, DNS_ANSWER_AUTHENTICATED);
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);
+ /* Add the validated RRset to the new
+ * list of validated RRsets, and
+ * remove it from the unvalidated
+ * RRsets. We mark the RRset as
+ * authenticated and cacheable. */
+ r = dns_answer_move_by_key(&validated, &t->answer, rr->key, DNS_ANSWER_AUTHENTICATED|DNS_ANSWER_CACHEABLE);
if (r < 0)
return r;
@@ -1422,6 +1946,22 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
* is irrelevant, as there might be
* more DNSKEYs coming. */
+ if (result == DNSSEC_NO_SIGNATURE) {
+ r = dns_transaction_requires_rrsig(t, rr);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ /* Data does not require signing. In that case, just copy it over,
+ * but remember that this is by no means authenticated.*/
+ r = dns_answer_move_by_key(&validated, &t->answer, rr->key, 0);
+ if (r < 0)
+ return r;
+
+ changed = true;
+ break;
+ }
+ }
+
r = dns_transaction_is_primary_response(t, rr);
if (r < 0)
return r;
@@ -1430,7 +1970,7 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
* to our question, and it
* failed validation. That's
* fatal. */
- t->dnssec_result = result;
+ t->answer_dnssec_result = result;
return 0;
}
@@ -1469,21 +2009,25 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
t->answer = validated;
validated = NULL;
- /* Everything that's now in t->answer is known to be good, hence cacheable. */
- t->n_answer_cacheable = (unsigned) -1; /* everything! */
-
/* At this point the answer only contains validated
* RRsets. Now, let's see if it actually answers the question
* we asked. If so, great! If it doesn't, then see if
* NSEC/NSEC3 can prove this. */
- r = dns_answer_match_key(t->answer, t->key);
- if (r < 0)
- return r;
+ r = dns_transaction_has_positive_answer(t, &flags);
if (r > 0) {
- /* Yes, it answer the question, everything is authenticated. */
- t->dnssec_result = DNSSEC_VALIDATED;
- t->answer_rcode = DNS_RCODE_SUCCESS;
- t->answer_authenticated = true;
+ /* Yes, it answers the question! */
+
+ if (flags & DNS_ANSWER_AUTHENTICATED) {
+ /* The answer is fully authenticated, yay. */
+ t->answer_dnssec_result = DNSSEC_VALIDATED;
+ t->answer_rcode = DNS_RCODE_SUCCESS;
+ t->answer_authenticated = true;
+ } else {
+ /* The answer is not fully authenticated. */
+ t->answer_dnssec_result = DNSSEC_UNSIGNED;
+ t->answer_authenticated = false;
+ }
+
} else if (r == 0) {
DnssecNsecResult nr;
@@ -1496,26 +2040,50 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
case DNSSEC_NSEC_NXDOMAIN:
/* NSEC proves the domain doesn't exist. Very good. */
- t->dnssec_result = DNSSEC_VALIDATED;
+ log_debug("Proved NXDOMAIN via NSEC/NSEC3 for transaction %u (%s)", t->id, dns_transaction_key_string(t));
+ t->answer_dnssec_result = DNSSEC_VALIDATED;
t->answer_rcode = DNS_RCODE_NXDOMAIN;
t->answer_authenticated = true;
break;
case DNSSEC_NSEC_NODATA:
/* NSEC proves that there's no data here, very good. */
- t->dnssec_result = DNSSEC_VALIDATED;
+ log_debug("Proved NODATA via NSEC/NSEC3 for transaction %u (%s)", t->id, dns_transaction_key_string(t));
+ t->answer_dnssec_result = DNSSEC_VALIDATED;
t->answer_rcode = DNS_RCODE_SUCCESS;
t->answer_authenticated = true;
break;
+ case DNSSEC_NSEC_OPTOUT:
+ /* NSEC3 says the data might not be signed */
+ log_debug("Data is NSEC3 opt-out via NSEC/NSEC3 for transaction %u (%s)", t->id, dns_transaction_key_string(t));
+ t->answer_dnssec_result = DNSSEC_UNSIGNED;
+ t->answer_authenticated = false;
+ break;
+
case DNSSEC_NSEC_NO_RR:
/* No NSEC data? Bummer! */
- t->dnssec_result = DNSSEC_UNSIGNED;
+
+ r = dns_transaction_requires_nsec(t);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ t->answer_dnssec_result = DNSSEC_NO_SIGNATURE;
+ else {
+ t->answer_dnssec_result = DNSSEC_UNSIGNED;
+ t->answer_authenticated = false;
+ }
+
+ break;
+
+ case DNSSEC_NSEC_UNSUPPORTED_ALGORITHM:
+ /* We don't know the NSEC3 algorithm used? */
+ t->answer_dnssec_result = DNSSEC_UNSUPPORTED_ALGORITHM;
break;
case DNSSEC_NSEC_FOUND:
/* NSEC says it needs to be there, but we couldn't find it? Bummer! */
- t->dnssec_result = DNSSEC_NSEC_MISMATCH;
+ t->answer_dnssec_result = DNSSEC_NSEC_MISMATCH;
break;
default:
@@ -1526,11 +2094,22 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
return 1;
}
+const char *dns_transaction_key_string(DnsTransaction *t) {
+ assert(t);
+
+ if (!t->key_string) {
+ if (dns_resource_key_to_string(t->key, &t->key_string) < 0)
+ return "n/a";
+ }
+
+ return strstrip(t->key_string);
+}
+
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_RCODE_FAILURE] = "rcode-failure",
[DNS_TRANSACTION_SUCCESS] = "success",
[DNS_TRANSACTION_NO_SERVERS] = "no-servers",
[DNS_TRANSACTION_TIMEOUT] = "timeout",
diff --git a/src/resolve/resolved-dns-transaction.h b/src/resolve/resolved-dns-transaction.h
index 1f35a4dd8f..fea25aab09 100644
--- a/src/resolve/resolved-dns-transaction.h
+++ b/src/resolve/resolved-dns-transaction.h
@@ -29,7 +29,7 @@ enum DnsTransactionState {
DNS_TRANSACTION_NULL,
DNS_TRANSACTION_PENDING,
DNS_TRANSACTION_VALIDATING,
- DNS_TRANSACTION_FAILURE,
+ DNS_TRANSACTION_RCODE_FAILURE,
DNS_TRANSACTION_SUCCESS,
DNS_TRANSACTION_NO_SERVERS,
DNS_TRANSACTION_TIMEOUT,
@@ -62,24 +62,34 @@ struct DnsTransaction {
DnsScope *scope;
DnsResourceKey *key;
+ char *key_string;
DnsTransactionState state;
- DnssecResult dnssec_result;
uint16_t id;
- bool initial_jitter_scheduled;
- bool initial_jitter_elapsed;
+ bool initial_jitter_scheduled:1;
+ bool initial_jitter_elapsed:1;
DnsPacket *sent, *received;
DnsAnswer *answer;
- unsigned n_answer_cacheable; /* Specifies how many RRs of the answer shall be cached, from the beginning */
int answer_rcode;
+ DnssecResult answer_dnssec_result;
DnsTransactionSource answer_source;
+
+ /* Indicates whether the primary answer is authenticated,
+ * i.e. whether the RRs from answer which directly match the
+ * question are authenticated, or, if there are none, whether
+ * the NODATA or NXDOMAIN case is. It says nothing about
+ * additional RRs listed in the answer, however they have
+ * their own DNS_ANSWER_AUTHORIZED FLAGS. Note that this bit
+ * is defined different than the AD bit in DNS packets, as
+ * that covers more than just the actual primary answer. */
bool answer_authenticated;
- /* Contains DS and DNSKEY RRs we already verified and need to authenticate this reply */
+ /* Contains DNSKEY, DS, SOA RRs we already verified and need
+ * to authenticate this reply */
DnsAnswer *validated_keys;
usec_t start_usec;
@@ -136,6 +146,8 @@ 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_key_string(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-trust-anchor.c b/src/resolve/resolved-dns-trust-anchor.c
index e55bdaa1ed..208b7fefc4 100644
--- a/src/resolve/resolved-dns-trust-anchor.c
+++ b/src/resolve/resolved-dns-trust-anchor.c
@@ -58,7 +58,7 @@ int dns_trust_anchor_load(DnsTrustAnchor *d) {
if (!answer)
return -ENOMEM;
- r = dns_answer_add(answer, rr, 0);
+ r = dns_answer_add(answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
diff --git a/src/resolve/resolved-dns-zone.c b/src/resolve/resolved-dns-zone.c
index 8046e2ed34..20c8a4da90 100644
--- a/src/resolve/resolved-dns-zone.c
+++ b/src/resolve/resolved-dns-zone.c
@@ -223,9 +223,9 @@ int dns_zone_put(DnsZone *z, DnsScope *s, DnsResourceRecord *rr, bool probe) {
assert(s);
assert(rr);
- if (rr->key->class == DNS_CLASS_ANY)
+ if (dns_class_is_pseudo(rr->key->class))
return -EINVAL;
- if (rr->key->type == DNS_TYPE_ANY)
+ if (dns_type_is_pseudo(rr->key->type))
return -EINVAL;
existing = dns_zone_get(z, rr);
@@ -386,7 +386,7 @@ int dns_zone_lookup(DnsZone *z, DnsResourceKey *key, DnsAnswer **ret_answer, Dns
if (k < 0)
return k;
if (k > 0) {
- r = dns_answer_add(answer, j->rr, 0);
+ r = dns_answer_add(answer, j->rr, 0, DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
@@ -412,7 +412,7 @@ int dns_zone_lookup(DnsZone *z, DnsResourceKey *key, DnsAnswer **ret_answer, Dns
if (j->state != DNS_ZONE_ITEM_PROBING)
tentative = false;
- r = dns_answer_add(answer, j->rr, 0);
+ r = dns_answer_add(answer, j->rr, 0, DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
}
diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c
index 84100bd988..0fe2bb30bd 100644
--- a/src/resolve/resolved-link.c
+++ b/src/resolve/resolved-link.c
@@ -183,6 +183,10 @@ static int link_update_dns_servers(Link *l) {
assert(l);
r = sd_network_link_get_dns(l->ifindex, &nameservers);
+ if (r == -ENODATA) {
+ r = 0;
+ goto clear;
+ }
if (r < 0)
goto clear;
@@ -222,6 +226,10 @@ static int link_update_llmnr_support(Link *l) {
assert(l);
r = sd_network_link_get_llmnr(l->ifindex, &b);
+ if (r == -ENODATA) {
+ r = 0;
+ goto clear;
+ }
if (r < 0)
goto clear;
@@ -252,6 +260,11 @@ static int link_update_search_domains(Link *l) {
assert(l);
r = sd_network_link_get_domains(l->ifindex, &domains);
+ if (r == -ENODATA) {
+ /* networkd knows nothing about this interface, and that's fine. */
+ r = 0;
+ goto clear;
+ }
if (r < 0)
goto clear;
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index a2677f442a..20955b3f6b 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -772,7 +772,7 @@ static int write_loop(int fd, void *message, size_t length) {
int manager_write(Manager *m, int fd, DnsPacket *p) {
int r;
- log_debug("Sending %s packet with id %u", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
+ log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
if (r < 0)
@@ -887,7 +887,7 @@ int manager_send(Manager *m, int fd, int ifindex, int family, const union in_add
assert(port > 0);
assert(p);
- log_debug("Sending %s packet with id %u on interface %i/%s", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family));
+ log_debug("Sending %s packet with id %" PRIu16 " on interface %i/%s.", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family));
if (family == AF_INET)
return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p);
diff --git a/src/resolve/resolved-mdns.c b/src/resolve/resolved-mdns.c
index d6973a6999..db23bc9d42 100644
--- a/src/resolve/resolved-mdns.c
+++ b/src/resolve/resolved-mdns.c
@@ -122,8 +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,
- p->answer->n_rrs, false, 0, p->family, &p->sender);
+ dns_cache_put(&scope->cache, NULL, DNS_PACKET_RCODE(p), p->answer, false, 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));
diff --git a/src/resolve/test-dnssec.c b/src/resolve/test-dnssec.c
index 3dab50ed6a..5b4ee220c4 100644
--- a/src/resolve/test-dnssec.c
+++ b/src/resolve/test-dnssec.c
@@ -118,7 +118,7 @@ static void test_dnssec_verify_rrset2(void) {
answer = dns_answer_new(1);
assert_se(answer);
- assert_se(dns_answer_add(answer, nsec, 0) >= 0);
+ assert_se(dns_answer_add(answer, nsec, 0, DNS_ANSWER_AUTHENTICATED) >= 0);
/* Validate the RR as it if was 2015-12-11 today */
assert_se(dnssec_verify_rrset(answer, nsec->key, rrsig, dnskey, 1449849318*USEC_PER_SEC, &result) >= 0);
@@ -201,7 +201,7 @@ static void test_dnssec_verify_rrset(void) {
answer = dns_answer_new(1);
assert_se(answer);
- assert_se(dns_answer_add(answer, a, 0) >= 0);
+ assert_se(dns_answer_add(answer, a, 0, DNS_ANSWER_AUTHENTICATED) >= 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, &result) >= 0);
diff --git a/src/shared/dns-domain.c b/src/shared/dns-domain.c
index 0466857042..c46f7d21b7 100644
--- a/src/shared/dns-domain.c
+++ b/src/shared/dns-domain.c
@@ -48,7 +48,6 @@ int dns_label_unescape(const char **name, char *dest, size_t sz) {
assert(name);
assert(*name);
- assert(dest);
n = *name;
d = dest;
@@ -79,9 +78,12 @@ int dns_label_unescape(const char **name, char *dest, size_t sz) {
else if (*n == '\\' || *n == '.') {
/* Escaped backslash or dot */
- *(d++) = *(n++);
+
+ if (d)
+ *(d++) = *n;
sz--;
r++;
+ n++;
} else if (n[0] >= '0' && n[0] <= '9') {
unsigned k;
@@ -100,7 +102,8 @@ int dns_label_unescape(const char **name, char *dest, size_t sz) {
if (k < ' ' || k > 255 || k == 127)
return -EINVAL;
- *(d++) = (char) k;
+ if (d)
+ *(d++) = (char) k;
sz--;
r++;
@@ -111,9 +114,12 @@ int dns_label_unescape(const char **name, char *dest, size_t sz) {
} else if ((uint8_t) *n >= (uint8_t) ' ' && *n != 127) {
/* Normal character */
- *(d++) = *(n++);
+
+ if (d)
+ *(d++) = *n;
sz--;
r++;
+ n++;
} else
return -EINVAL;
}
@@ -122,7 +128,7 @@ int dns_label_unescape(const char **name, char *dest, size_t sz) {
if (r == 0 && *n)
return -EINVAL;
- if (sz >= 1)
+ if (sz >= 1 && d)
*d = 0;
*name = n;
diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h
index 3f8f621802..02b51832b6 100644
--- a/src/shared/dns-domain.h
+++ b/src/shared/dns-domain.h
@@ -47,6 +47,10 @@ int dns_label_unescape_suffix(const char *name, const char **label_end, char *de
int dns_label_escape(const char *p, size_t l, char *dest, size_t sz);
int dns_label_escape_new(const char *p, size_t l, char **ret);
+static inline int dns_name_parent(const char **name) {
+ return dns_label_unescape(name, NULL, DNS_LABEL_MAX);
+}
+
int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);
int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);