tls-socket: Allow configuring both minimum and maximum TLS versions

src/libtls/tests/suites/test_socket.c

@@ -298,7 +298,7 @@ static job_requeue_t serve_echo(echo_server_config_t *config)
 		}
 
 		tls = tls_socket_create(TRUE, server, client, cfd, NULL,
-								config->version, TRUE);
+								TLS_1_0, config->version, TRUE);
 		ck_assert(tls != NULL);
 
 		while (TRUE)
@@ -374,7 +374,7 @@ static void run_echo_client(echo_server_config_t *config)
 	ck_assert(connect(fd, host->get_sockaddr(host),
 					  *host->get_sockaddr_len(host)) != -1);
 	tls = tls_socket_create(FALSE, server, client, fd, NULL,
-							config->version, TRUE);
+							TLS_1_0, config->version, TRUE);
 	ck_assert(tls != NULL);
 
 	wr = rd = 0;

src/libtls/tls_socket.c

@@ -405,8 +405,9 @@ METHOD(tls_socket_t, destroy, void,
  * See header
  */
 tls_socket_t *tls_socket_create(bool is_server, identification_t *server,
-							identification_t *peer, int fd, tls_cache_t *cache,
-							tls_version_t max_version, bool nullok)
+								identification_t *peer, int fd,
+								tls_cache_t *cache, tls_version_t min_version,
+								tls_version_t max_version, bool nullok)
 {
 	private_tls_socket_t *this;
 	tls_purpose_t purpose;
@@ -442,12 +443,11 @@ tls_socket_t *tls_socket_create(bool is_server, identification_t *server,
 
 	this->tls = tls_create(is_server, server, peer, purpose,
 						   &this->app.application, cache);
-	if (!this->tls)
+	if (!this->tls ||
+		!this->tls->set_version(this->tls, min_version, max_version))
 	{
 		free(this);
 		return NULL;
 	}
-	this->tls->set_version(this->tls, TLS_1_0, max_version);
-
 	return &this->public;
 }

src/libtls/tls_socket.h

@@ -104,12 +104,14 @@ struct tls_socket_t {
  * @param peer				client identity, NULL for no client authentication
  * @param fd				socket to read/write from
  * @param cache				session cache to use, or NULL
+ * @param min_version		minimum TLS version to negotiate
  * @param max_version		maximum TLS version to negotiate
  * @param nullok			accept NULL encryption ciphers
  * @return					TLS socket wrapper
  */
 tls_socket_t *tls_socket_create(bool is_server, identification_t *server,
-							identification_t *peer, int fd, tls_cache_t *cache,
-							tls_version_t max_version, bool nullok);
+								identification_t *peer, int fd,
+								tls_cache_t *cache, tls_version_t min_version,
+								tls_version_t max_version, bool nullok);
 
 #endif /** TLS_SOCKET_H_ @}*/