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-rw-r--r--src/resolve/resolved-dns-transaction.c16
-rw-r--r--src/resolve/resolved-dns-transaction.h1
-rw-r--r--src/resolve/resolved-dns-trust-anchor.c101
-rw-r--r--src/resolve/resolved-dns-trust-anchor.h39
-rw-r--r--src/resolve/resolved-manager.c6
-rw-r--r--src/resolve/resolved-manager.h3
6 files changed, 165 insertions, 1 deletions
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index 90133cb332..7bef4be2ad 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -675,7 +675,20 @@ int dns_transaction_go(DnsTransaction *t) {
t->answer_rcode = 0;
t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID;
- /* Check the zone, but obly if this transaction is not used
+ /* Check the trust anchor. Do so only on classic DNS, since DNSSEC does not apply otherwise. */
+ if (t->scope->protocol == DNS_PROTOCOL_DNS) {
+ r = dns_trust_anchor_lookup(&t->scope->manager->trust_anchor, t->key, &t->answer);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ t->answer_rcode = DNS_RCODE_SUCCESS;
+ t->answer_source = DNS_TRANSACTION_TRUST_ANCHOR;
+ dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS);
+ return 0;
+ }
+ }
+
+ /* Check the zone, but only if this transaction is not used
* for probing or verifying a zone item. */
if (set_isempty(t->zone_items)) {
@@ -817,5 +830,6 @@ static const char* const dns_transaction_source_table[_DNS_TRANSACTION_SOURCE_MA
[DNS_TRANSACTION_NETWORK] = "network",
[DNS_TRANSACTION_CACHE] = "cache",
[DNS_TRANSACTION_ZONE] = "zone",
+ [DNS_TRANSACTION_TRUST_ANCHOR] = "trust-anchor",
};
DEFINE_STRING_TABLE_LOOKUP(dns_transaction_source, DnsTransactionSource);
diff --git a/src/resolve/resolved-dns-transaction.h b/src/resolve/resolved-dns-transaction.h
index 5778913cc8..9a2662ec0e 100644
--- a/src/resolve/resolved-dns-transaction.h
+++ b/src/resolve/resolved-dns-transaction.h
@@ -44,6 +44,7 @@ enum DnsTransactionSource {
DNS_TRANSACTION_NETWORK,
DNS_TRANSACTION_CACHE,
DNS_TRANSACTION_ZONE,
+ DNS_TRANSACTION_TRUST_ANCHOR,
_DNS_TRANSACTION_SOURCE_MAX,
_DNS_TRANSACTION_SOURCE_INVALID = -1
};
diff --git a/src/resolve/resolved-dns-trust-anchor.c b/src/resolve/resolved-dns-trust-anchor.c
new file mode 100644
index 0000000000..e55bdaa1ed
--- /dev/null
+++ b/src/resolve/resolved-dns-trust-anchor.c
@@ -0,0 +1,101 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "alloc-util.h"
+#include "resolved-dns-trust-anchor.h"
+
+/* The DS RR from https://data.iana.org/root-anchors/root-anchors.xml */
+static const uint8_t root_digest[] =
+ { 0x49, 0xAA, 0xC1, 0x1D, 0x7B, 0x6F, 0x64, 0x46, 0x70, 0x2E, 0x54, 0xA1, 0x60, 0x73, 0x71, 0x60,
+ 0x7A, 0x1A, 0x41, 0x85, 0x52, 0x00, 0xFD, 0x2C, 0xE1, 0xCD, 0xDE, 0x32, 0xF2, 0x4E, 0x8F, 0xB5 };
+
+int dns_trust_anchor_load(DnsTrustAnchor *d) {
+ _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+ _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
+ int r;
+
+ assert(d);
+
+ r = hashmap_ensure_allocated(&d->by_key, &dns_resource_key_hash_ops);
+ if (r < 0)
+ return r;
+
+ if (hashmap_get(d->by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, ".")))
+ return 0;
+
+ /* Add the RR from https://data.iana.org/root-anchors/root-anchors.xml */
+ rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, "");
+ if (!rr)
+ return -ENOMEM;
+
+ rr->ds.key_tag = 19036;
+ rr->ds.algorithm = DNSSEC_ALGORITHM_RSASHA256;
+ rr->ds.digest_type = DNSSEC_DIGEST_SHA256;
+ rr->ds.digest_size = sizeof(root_digest);
+ rr->ds.digest = memdup(root_digest, rr->ds.digest_size);
+ if (!rr->ds.digest)
+ return -ENOMEM;
+
+ answer = dns_answer_new(1);
+ if (!answer)
+ return -ENOMEM;
+
+ r = dns_answer_add(answer, rr, 0);
+ if (r < 0)
+ return r;
+
+ r = hashmap_put(d->by_key, rr->key, answer);
+ if (r < 0)
+ return r;
+
+ answer = NULL;
+ return 0;
+}
+
+void dns_trust_anchor_flush(DnsTrustAnchor *d) {
+ DnsAnswer *a;
+
+ assert(d);
+
+ while ((a = hashmap_steal_first(d->by_key)))
+ dns_answer_unref(a);
+
+ d->by_key = hashmap_free(d->by_key);
+}
+
+int dns_trust_anchor_lookup(DnsTrustAnchor *d, DnsResourceKey *key, DnsAnswer **ret) {
+ DnsAnswer *a;
+
+ assert(d);
+ assert(key);
+ assert(ret);
+
+ /* We only serve DS and DNSKEY RRs. */
+ if (!IN_SET(key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY))
+ return 0;
+
+ a = hashmap_get(d->by_key, key);
+ if (!a)
+ return 0;
+
+ *ret = dns_answer_ref(a);
+ return 1;
+}
diff --git a/src/resolve/resolved-dns-trust-anchor.h b/src/resolve/resolved-dns-trust-anchor.h
new file mode 100644
index 0000000000..06f3723914
--- /dev/null
+++ b/src/resolve/resolved-dns-trust-anchor.h
@@ -0,0 +1,39 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+typedef struct DnsTrustAnchor DnsTrustAnchor;
+
+#include "hashmap.h"
+#include "resolved-dns-answer.h"
+#include "resolved-dns-rr.h"
+
+/* This contains a fixed database mapping domain names to DS or DNSKEY records. */
+
+struct DnsTrustAnchor {
+ Hashmap *by_key;
+};
+
+int dns_trust_anchor_load(DnsTrustAnchor *d);
+void dns_trust_anchor_flush(DnsTrustAnchor *d);
+
+int dns_trust_anchor_lookup(DnsTrustAnchor *d, DnsResourceKey* key, DnsAnswer **answer);
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index 62562f0d24..5a3696ccb0 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -478,6 +478,10 @@ int manager_new(Manager **ret) {
m->read_resolv_conf = true;
m->need_builtin_fallbacks = true;
+ r = dns_trust_anchor_load(&m->trust_anchor);
+ if (r < 0)
+ return r;
+
r = sd_event_default(&m->event);
if (r < 0)
return r;
@@ -572,6 +576,8 @@ Manager *manager_free(Manager *m) {
free(m->llmnr_hostname);
free(m->mdns_hostname);
+ dns_trust_anchor_flush(&m->trust_anchor);
+
free(m);
return NULL;
diff --git a/src/resolve/resolved-manager.h b/src/resolve/resolved-manager.h
index d00c444583..1056f23ab7 100644
--- a/src/resolve/resolved-manager.h
+++ b/src/resolve/resolved-manager.h
@@ -44,6 +44,7 @@ enum Support {
#include "resolved-dns-search-domain.h"
#include "resolved-dns-server.h"
#include "resolved-dns-stream.h"
+#include "resolved-dns-trust-anchor.h"
#include "resolved-link.h"
#define MANAGER_SEARCH_DOMAINS_MAX 32
@@ -85,6 +86,8 @@ struct Manager {
bool read_resolv_conf:1;
usec_t resolv_conf_mtime;
+ DnsTrustAnchor trust_anchor;
+
LIST_HEAD(DnsScope, dns_scopes);
DnsScope *unicast_scope;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-07 00:02:53 +0000