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-rw-r--r--src/resolve/resolved-dnstls-gnutls.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/src/resolve/resolved-dnstls-gnutls.c b/src/resolve/resolved-dnstls-gnutls.c
new file mode 100644
index 0000000..6ac026e
--- /dev/null
+++ b/src/resolve/resolved-dnstls-gnutls.c
@@ -0,0 +1,253 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#if !ENABLE_DNS_OVER_TLS || !DNS_OVER_TLS_USE_GNUTLS
+#error This source file requires DNS-over-TLS to be enabled and GnuTLS to be available.
+#endif
+
+#include <gnutls/socket.h>
+
+#include "iovec-util.h"
+#include "resolved-dns-stream.h"
+#include "resolved-dnstls.h"
+#include "resolved-manager.h"
+
+#define TLS_PROTOCOL_PRIORITY "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2"
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(gnutls_session_t, gnutls_deinit, NULL);
+
+static ssize_t dnstls_stream_vec_push(gnutls_transport_ptr_t p, const giovec_t *iov, int iovcnt) {
+ int r;
+
+ assert(p);
+
+ r = dns_stream_writev((DnsStream*) p, (const struct iovec*) iov, iovcnt, DNS_STREAM_WRITE_TLS_DATA);
+ if (r < 0) {
+ errno = -r;
+ return -1;
+ }
+
+ return r;
+}
+
+int dnstls_stream_connect_tls(DnsStream *stream, DnsServer *server) {
+ _cleanup_(gnutls_deinitp) gnutls_session_t gs = NULL;
+ int r;
+
+ assert(stream);
+ assert(server);
+
+ r = gnutls_init(&gs, GNUTLS_CLIENT | GNUTLS_ENABLE_FALSE_START | GNUTLS_NONBLOCK);
+ if (r < 0)
+ return r;
+
+ /* As DNS-over-TLS is a recent protocol, older TLS versions can be disabled */
+ r = gnutls_priority_set_direct(gs, TLS_PROTOCOL_PRIORITY, NULL);
+ if (r < 0)
+ return r;
+
+ r = gnutls_credentials_set(gs, GNUTLS_CRD_CERTIFICATE, stream->manager->dnstls_data.cert_cred);
+ if (r < 0)
+ return r;
+
+ if (server->dnstls_data.session_data.size > 0) {
+ gnutls_session_set_data(gs, server->dnstls_data.session_data.data, server->dnstls_data.session_data.size);
+
+ // Clear old session ticket
+ gnutls_free(server->dnstls_data.session_data.data);
+ server->dnstls_data.session_data.data = NULL;
+ server->dnstls_data.session_data.size = 0;
+ }
+
+ if (server->manager->dns_over_tls_mode == DNS_OVER_TLS_YES) {
+ if (server->server_name)
+ gnutls_session_set_verify_cert(gs, server->server_name, 0);
+ else {
+ stream->dnstls_data.validation.type = GNUTLS_DT_IP_ADDRESS;
+ if (server->family == AF_INET) {
+ stream->dnstls_data.validation.data = (unsigned char*) &server->address.in.s_addr;
+ stream->dnstls_data.validation.size = 4;
+ } else {
+ stream->dnstls_data.validation.data = server->address.in6.s6_addr;
+ stream->dnstls_data.validation.size = 16;
+ }
+ gnutls_session_set_verify_cert2(gs, &stream->dnstls_data.validation, 1, 0);
+ }
+ }
+
+ if (server->server_name) {
+ r = gnutls_server_name_set(gs, GNUTLS_NAME_DNS, server->server_name, strlen(server->server_name));
+ if (r < 0)
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to set server name: %s", gnutls_strerror(r));
+ }
+
+ gnutls_handshake_set_timeout(gs, GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT);
+
+ gnutls_transport_set_ptr2(gs, (gnutls_transport_ptr_t) (long) stream->fd, stream);
+ gnutls_transport_set_vec_push_function(gs, &dnstls_stream_vec_push);
+
+ stream->encrypted = true;
+ stream->dnstls_data.handshake = gnutls_handshake(gs);
+ if (stream->dnstls_data.handshake < 0 && gnutls_error_is_fatal(stream->dnstls_data.handshake))
+ return -ECONNREFUSED;
+
+ stream->dnstls_data.session = TAKE_PTR(gs);
+
+ return 0;
+}
+
+void dnstls_stream_free(DnsStream *stream) {
+ assert(stream);
+ assert(stream->encrypted);
+
+ if (stream->dnstls_data.session)
+ gnutls_deinit(stream->dnstls_data.session);
+}
+
+int dnstls_stream_on_io(DnsStream *stream, uint32_t revents) {
+ int r;
+
+ assert(stream);
+ assert(stream->encrypted);
+ assert(stream->dnstls_data.session);
+
+ if (stream->dnstls_data.shutdown) {
+ r = gnutls_bye(stream->dnstls_data.session, GNUTLS_SHUT_RDWR);
+ if (r == GNUTLS_E_AGAIN) {
+ stream->dnstls_events = gnutls_record_get_direction(stream->dnstls_data.session) == 1 ? EPOLLOUT : EPOLLIN;
+ return -EAGAIN;
+ } else if (r < 0)
+ log_debug("Failed to invoke gnutls_bye: %s", gnutls_strerror(r));
+
+ stream->dnstls_events = 0;
+ stream->dnstls_data.shutdown = false;
+ dns_stream_unref(stream);
+ return DNSTLS_STREAM_CLOSED;
+ } else if (stream->dnstls_data.handshake < 0) {
+ stream->dnstls_data.handshake = gnutls_handshake(stream->dnstls_data.session);
+ if (stream->dnstls_data.handshake == GNUTLS_E_AGAIN) {
+ stream->dnstls_events = gnutls_record_get_direction(stream->dnstls_data.session) == 1 ? EPOLLOUT : EPOLLIN;
+ return -EAGAIN;
+ } else if (stream->dnstls_data.handshake < 0) {
+ log_debug("Failed to invoke gnutls_handshake: %s", gnutls_strerror(stream->dnstls_data.handshake));
+ if (gnutls_error_is_fatal(stream->dnstls_data.handshake))
+ return -ECONNREFUSED;
+ }
+
+ stream->dnstls_events = 0;
+ }
+
+ return 0;
+}
+
+int dnstls_stream_shutdown(DnsStream *stream, int error) {
+ int r;
+
+ assert(stream);
+ assert(stream->encrypted);
+ assert(stream->dnstls_data.session);
+
+ /* Store TLS Ticket for faster successive TLS handshakes */
+ if (stream->server && stream->server->dnstls_data.session_data.size == 0 && stream->dnstls_data.handshake == GNUTLS_E_SUCCESS)
+ gnutls_session_get_data2(stream->dnstls_data.session, &stream->server->dnstls_data.session_data);
+
+ if (IN_SET(error, ETIMEDOUT, 0)) {
+ r = gnutls_bye(stream->dnstls_data.session, GNUTLS_SHUT_RDWR);
+ if (r == GNUTLS_E_AGAIN) {
+ if (!stream->dnstls_data.shutdown) {
+ stream->dnstls_data.shutdown = true;
+ dns_stream_ref(stream);
+ return -EAGAIN;
+ }
+ } else if (r < 0)
+ log_debug("Failed to invoke gnutls_bye: %s", gnutls_strerror(r));
+ }
+
+ return 0;
+}
+
+ssize_t dnstls_stream_writev(DnsStream *stream, const struct iovec *iov, size_t iovcnt) {
+ ssize_t ss;
+
+ assert(stream);
+ assert(stream->encrypted);
+ assert(stream->dnstls_data.session);
+ assert(iov);
+ assert(iovec_total_size(iov, iovcnt) > 0);
+
+ gnutls_record_cork(stream->dnstls_data.session);
+
+ for (size_t i = 0; i < iovcnt; i++) {
+ ss = gnutls_record_send(
+ stream->dnstls_data.session,
+ iov[i].iov_base, iov[i].iov_len);
+ if (ss < 0)
+ break;
+ }
+
+ ss = gnutls_record_uncork(stream->dnstls_data.session, 0);
+ if (ss < 0)
+ switch (ss) {
+ case GNUTLS_E_INTERRUPTED:
+ return -EINTR;
+ case GNUTLS_E_AGAIN:
+ return -EAGAIN;
+ default:
+ return log_debug_errno(SYNTHETIC_ERRNO(EPIPE),
+ "Failed to invoke gnutls_record_send: %s",
+ gnutls_strerror(ss));
+ }
+
+ return ss;
+}
+
+ssize_t dnstls_stream_read(DnsStream *stream, void *buf, size_t count) {
+ ssize_t ss;
+
+ assert(stream);
+ assert(stream->encrypted);
+ assert(stream->dnstls_data.session);
+ assert(buf);
+
+ ss = gnutls_record_recv(stream->dnstls_data.session, buf, count);
+ if (ss < 0)
+ switch (ss) {
+ case GNUTLS_E_INTERRUPTED:
+ return -EINTR;
+ case GNUTLS_E_AGAIN:
+ return -EAGAIN;
+ default:
+ return log_debug_errno(SYNTHETIC_ERRNO(EPIPE),
+ "Failed to invoke gnutls_record_recv: %s",
+ gnutls_strerror(ss));
+ }
+
+ return ss;
+}
+
+void dnstls_server_free(DnsServer *server) {
+ assert(server);
+
+ if (server->dnstls_data.session_data.data)
+ gnutls_free(server->dnstls_data.session_data.data);
+}
+
+int dnstls_manager_init(Manager *manager) {
+ int r;
+ assert(manager);
+
+ r = gnutls_certificate_allocate_credentials(&manager->dnstls_data.cert_cred);
+ if (r < 0)
+ return -ENOMEM;
+
+ r = gnutls_certificate_set_x509_system_trust(manager->dnstls_data.cert_cred);
+ if (r < 0)
+ log_warning("Failed to load system trust store: %s", gnutls_strerror(r));
+
+ return 0;
+}
+
+void dnstls_manager_free(Manager *manager) {
+ assert(manager);
+
+ if (manager->dnstls_data.cert_cred)
+ gnutls_certificate_free_credentials(manager->dnstls_data.cert_cred);
+}