tests: added unit test for overriding TLS extensions

Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>

2 files changed, 316 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 82b3b81a5a..c468fbf029 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -143,7 +143,7 @@ ctests = mini-record-2 simple gc set_pkcs12_cred cert certuniqueid	\
 	 send-data-before-handshake recv-data-before-handshake crt_inv_write \
 	 x509sign-verify-error rng-op-nonce rng-op-random rng-op-key x509-dn-decode-compat \
 	 ip-check mini-x509-ipaddr trust-store base64-raw random-art dhex509self \
-	 dss-sig-val sign-pk-api
+	 dss-sig-val sign-pk-api tls-session-ext-override
 
 if HAVE_SECCOMP_TESTS
 ctests += dtls-with-seccomp tls-with-seccomp dtls-client-with-seccomp tls-client-with-seccomp
diff --git a/tests/tls-session-ext-override.c b/tests/tls-session-ext-override.c
new file mode 100644
index 0000000000..e8c5379483
--- /dev/null
+++ b/tests/tls-session-ext-override.c
@@ -0,0 +1,315 @@
+/*
+ * Copyright (C) 2004-2016 Free Software Foundation, Inc.
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * Author: Thierry Quemerais, Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * GnuTLS is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuTLS 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/* This program tests whether an extension is exchanged when registered
+ * at the session level */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(_WIN32)
+
+/* socketpair isn't supported on Win32. */
+int main(int argc, char **argv)
+{
+	exit(77);
+}
+
+#else
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#if !defined(_WIN32)
+#include <sys/wait.h>
+#include <signal.h>
+#endif
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+
+#include "utils.h"
+#include "cert-common.h"
+
+const char *side = "";
+
+static void tls_log_func(int level, const char *str)
+{
+	fprintf(stderr, "%s|<%d>| %s", side, level, str);
+}
+
+static int TLSEXT_TYPE_client_sent		= 0;
+static int TLSEXT_TYPE_client_received		= 0;
+static int TLSEXT_TYPE_server_sent		= 0;
+static int TLSEXT_TYPE_server_received		= 0;
+static int overriden_extension = -1;
+
+static const unsigned char ext_data[] =
+{
+	0xFE,
+	0xED
+};
+
+static int ext_recv_client_params(gnutls_session_t session, const unsigned char *buf, size_t buflen)
+{
+	if (buflen != sizeof(ext_data))
+		fail("ext_recv_client_params: Invalid input buffer length\n");
+
+	if (memcmp(buf, ext_data, sizeof(ext_data)) != 0)
+		fail("ext_recv_client_params: Invalid input buffer data\n");
+
+	TLSEXT_TYPE_client_received = 1;
+
+	gnutls_ext_set_data(session, overriden_extension, session);
+
+	return 0; //Success
+}
+
+static int ext_send_client_params(gnutls_session_t session, gnutls_buffer_t extdata)
+{
+	TLSEXT_TYPE_client_sent = 1;
+	gnutls_buffer_append_data(extdata, ext_data, sizeof(ext_data));
+	return sizeof(ext_data);
+}
+
+static int ext_recv_server_params(gnutls_session_t session, const unsigned char *buf, size_t buflen)
+{
+	if (buflen != sizeof(ext_data))
+		fail("ext_recv_server_params: Invalid input buffer length\n");
+
+	if (memcmp(buf, ext_data, sizeof(ext_data)) != 0)
+		fail("ext_recv_server_params: Invalid input buffer data\n");
+
+	TLSEXT_TYPE_server_received = 1;
+
+	return 0; //Success
+}
+
+static int ext_send_server_params(gnutls_session_t session, gnutls_buffer_t extdata)
+{
+	TLSEXT_TYPE_server_sent = 1;
+	gnutls_buffer_append_data(extdata, ext_data, sizeof(ext_data));
+	return sizeof(ext_data);
+}
+
+static void client(int sd)
+{
+	int ret;
+	gnutls_session_t session;
+	gnutls_certificate_credentials_t clientx509cred;
+	void *p;
+
+	global_init();
+	gnutls_global_set_log_function(tls_log_func);
+	if (debug)
+		gnutls_global_set_log_level(4711);
+
+	side = "client";
+
+	gnutls_certificate_allocate_credentials(&clientx509cred);
+
+	/* Initialize TLS session
+	 */
+	gnutls_init(&session, GNUTLS_CLIENT);
+
+	/* Use default priorities */
+	gnutls_priority_set_direct(session, "PERFORMANCE:+ANON-ECDH:+ANON-DH",
+				   NULL);
+
+	/* put the anonymous credentials to the current session
+	 */
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
+				clientx509cred);
+
+	gnutls_transport_set_int(session, sd);
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	ret = gnutls_session_ext_register(session, "ext_client", overriden_extension, GNUTLS_EXT_TLS, ext_recv_client_params, ext_send_client_params, NULL, NULL, NULL, 0);
+	if (ret != GNUTLS_E_ALREADY_REGISTERED)
+		fail("client: register existing extension (%d)\n", overriden_extension);
+
+	ret = gnutls_session_ext_register(session, "ext_client", 0, GNUTLS_EXT_TLS, ext_recv_client_params, ext_send_client_params, NULL, NULL, NULL, GNUTLS_EXT_FLAG_OVERRIDE_INTERNAL);
+	if (ret != GNUTLS_E_ALREADY_REGISTERED)
+		fail("client: register extension %d\n", 0);
+
+	ret = gnutls_session_ext_register(session, "ext_client", overriden_extension, GNUTLS_EXT_TLS, ext_recv_client_params, ext_send_client_params, NULL, NULL, NULL, GNUTLS_EXT_FLAG_OVERRIDE_INTERNAL);
+	if (ret < 0)
+		fail("client: register extension (%d)\n", overriden_extension);
+
+	/* Perform the TLS handshake
+	 */
+	ret = gnutls_handshake(session);
+
+	if (ret < 0) {
+		fail("[%d]: client: Handshake failed\n", overriden_extension);
+		gnutls_perror(ret);
+		goto end;
+	} else {
+		if (debug)
+			success("client: Handshake was completed\n");
+	}
+
+	if (TLSEXT_TYPE_client_sent != 1 || TLSEXT_TYPE_client_received != 1)
+		fail("client: extension not properly sent/received\n");
+
+	ret = gnutls_ext_get_data(session, overriden_extension, &p);
+	if (ret < 0) {
+		fail("gnutls_ext_get_data: %s\n", gnutls_strerror(ret));
+	}
+
+	if (p != session) {
+		fail("client: gnutls_ext_get_data failed\n");
+	}
+
+	gnutls_bye(session, GNUTLS_SHUT_RDWR);
+
+end:
+	close(sd);
+
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(clientx509cred);
+
+	gnutls_global_deinit();
+}
+
+static void server(int sd)
+{
+	gnutls_certificate_credentials_t serverx509cred;
+	int ret;
+	gnutls_session_t session;
+
+	/* this must be called once in the program
+	 */
+	global_init();
+	gnutls_global_set_log_function(tls_log_func);
+	if (debug)
+		gnutls_global_set_log_level(4711);
+
+	side = "server";
+
+	gnutls_certificate_allocate_credentials(&serverx509cred);
+	gnutls_certificate_set_x509_key_mem(serverx509cred,
+					    &server_cert, &server_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	gnutls_init(&session, GNUTLS_SERVER);
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	gnutls_priority_set_direct(session, "PERFORMANCE:+ANON-ECDH:+ANON-DH",
+				   NULL);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
+				serverx509cred);
+
+	ret = gnutls_session_ext_register(session, "ext_server", overriden_extension, GNUTLS_EXT_TLS, ext_recv_server_params, ext_send_server_params, NULL, NULL, NULL, 0);
+	if (ret != GNUTLS_E_ALREADY_REGISTERED)
+		fail("client: register existing extension\n");
+
+	ret = gnutls_session_ext_register(session, "ext_server", overriden_extension, GNUTLS_EXT_TLS, ext_recv_server_params, ext_send_server_params, NULL, NULL, NULL, GNUTLS_EXT_FLAG_OVERRIDE_INTERNAL);
+	if (ret < 0)
+		fail("client: register extension\n");
+
+	gnutls_transport_set_int(session, sd);
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	ret = gnutls_handshake(session);
+	if (ret < 0) {
+		close(sd);
+		gnutls_deinit(session);
+		fail("[%d]: server: Handshake has failed (%s)\n\n",
+		     overriden_extension, gnutls_strerror(ret));
+		return;
+	}
+	if (debug)
+		success("server: Handshake was completed\n");
+
+	if (TLSEXT_TYPE_server_sent != 1 || TLSEXT_TYPE_server_received != 1)
+		fail("server: extension not properly sent/received\n");
+
+	/* do not wait for the peer to close the connection.
+	 */
+	gnutls_bye(session, GNUTLS_SHUT_WR);
+
+	close(sd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(serverx509cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: finished\n");
+}
+
+static void override_ext(unsigned extension)
+{
+	pid_t child;
+	int sockets[2];
+	int err;
+
+	signal(SIGPIPE, SIG_IGN);
+
+	err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
+	if (err == -1) {
+		perror("socketpair");
+		fail("socketpair failed\n");
+		return;
+	}
+
+	TLSEXT_TYPE_client_sent	= 0;
+	TLSEXT_TYPE_client_received = 0;
+	TLSEXT_TYPE_server_sent	= 0;
+	TLSEXT_TYPE_server_received = 0;
+	overriden_extension = extension;
+
+	child = fork();
+	if (child < 0) {
+		perror("fork");
+		fail("fork");
+		return;
+	}
+
+	if (child) {
+		int status;
+		/* parent */
+		close(sockets[1]);
+		server(sockets[0]);
+		wait(&status);
+	} else {
+		close(sockets[0]);
+		client(sockets[1]);
+	}
+}
+
+void doit(void)
+{
+	override_ext(1);
+	override_ext(21);
+}
+
+#endif				/* _WIN32 */