1 files changed, 293 insertions, 0 deletions
diff --git a/tests/tlsext-decoding.c b/tests/tlsext-decoding.c
new file mode 100644
index 0000000..2794d2c
--- /dev/null
+++ b/tests/tlsext-decoding.c
@@ -0,0 +1,293 @@
+/*
+ * Copyright (C) 2015 Nikos Mavrogiannopoulos
+ *
+ * Author: 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 General Public License
+ * along with GnuTLS; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "cert-common.h"
+
+/* This test checks whether an invalid extensions field will lead
+ * to a GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH. */
+
+#if defined(_WIN32)
+
+int main()
+{
+	exit(77);
+}
+
+#else
+
+#include <string.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <signal.h>
+#include <assert.h>
+#include <gnutls/gnutls.h>
+
+#include "utils.h"
+
+static void terminate(void);
+static unsigned reduce = 0;
+
+/* This program tests the client hello verify in DTLS
+ */
+
+static void server_log_func(int level, const char *str)
+{
+	fprintf(stderr, "server|<%d>| %s", level, str);
+}
+
+static void client_log_func(int level, const char *str)
+{
+	fprintf(stderr, "client|<%d>| %s", level, str);
+}
+
+#define RECORD_PAYLOAD_POS 5
+#define HANDSHAKE_ID_POS (38)
+static ssize_t odd_push(gnutls_transport_ptr_t tr, const void *data, size_t len)
+{
+	uint8_t *d = (void*)data;
+	int fd = (long)tr;
+	uint16_t csize, osize;
+	int pos;
+
+	if (d[0] == 22 && d[5] == GNUTLS_HANDSHAKE_CLIENT_HELLO) {
+		uint8_t isize;
+
+		/* skip session ID (this can be non-empty in TLS 1.3) */
+		isize = d[RECORD_PAYLOAD_POS+HANDSHAKE_ID_POS];
+		isize += 1;
+
+		/* skip ciphersuites */
+		csize = d[RECORD_PAYLOAD_POS+HANDSHAKE_ID_POS+isize+1] + (d[RECORD_PAYLOAD_POS+HANDSHAKE_ID_POS+isize] << 8);
+		csize += 2;
+
+		/* skip compression methods */
+		osize = d[RECORD_PAYLOAD_POS+HANDSHAKE_ID_POS+isize+csize];
+		osize += 1;
+
+		pos = RECORD_PAYLOAD_POS+HANDSHAKE_ID_POS+isize+csize+osize;
+
+		if (reduce) {
+			if (d[pos+1] != 0x00) {
+				d[pos+1] = d[pos+1] - 1;
+			} else {
+				d[pos] = d[pos] - 1;
+				d[pos+1] = 0xff;
+			}
+		} else {
+			if (d[pos+1] != 0xff) {
+				d[pos+1] = d[pos+1] + 1;
+			} else {
+				d[pos] = d[pos] + 1;
+				d[pos+1] = 0x00;
+			}
+		
+		}
+	}
+
+	return send(fd, data, len, 0);
+}
+
+/* A very basic DTLS client handling DTLS 0.9 which sets premaster secret.
+ */
+
+static void client(int fd, const char *prio)
+{
+	int ret;
+	gnutls_certificate_credentials_t xcred;
+	gnutls_session_t session;
+
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(client_log_func);
+		gnutls_global_set_log_level(4711);
+	}
+
+	gnutls_certificate_allocate_credentials(&xcred);
+
+	/* Initialize TLS session
+	 */
+	gnutls_init(&session, GNUTLS_CLIENT);
+	gnutls_handshake_set_timeout(session, get_timeout());
+
+	assert(gnutls_priority_set_direct(session, prio, NULL) >= 0);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);
+
+	gnutls_transport_set_int(session, fd);
+	gnutls_transport_set_push_function(session, odd_push);
+
+	/* Perform the TLS handshake
+	 */
+	do {
+		ret = gnutls_handshake(session);
+	}
+	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+	if (ret >= 0) {
+		fail("client: Handshake succeeded!\n");
+		exit(1);
+	}
+
+	close(fd);
+
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(xcred);
+
+	gnutls_global_deinit();
+}
+
+
+/* These are global */
+pid_t child;
+
+static void terminate(void)
+{
+	int status;
+	assert(child);
+	kill(child, SIGTERM);
+	wait(&status);
+	exit(1);
+}
+
+static void server(int fd, const char *prio)
+{
+	int ret;
+	gnutls_certificate_credentials_t xcred;
+	gnutls_session_t session;
+
+	/* this must be called once in the program
+	 */
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(server_log_func);
+		gnutls_global_set_log_level(4711);
+	}
+
+	gnutls_certificate_allocate_credentials(&xcred);
+
+	ret = gnutls_certificate_set_x509_key_mem(xcred,
+					    &server_cert, &server_key,
+					    GNUTLS_X509_FMT_PEM);
+	if (ret < 0)
+		exit(1);
+
+	gnutls_init(&session, GNUTLS_SERVER);
+	gnutls_handshake_set_timeout(session, get_timeout());
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	assert(gnutls_priority_set_direct(session, prio, NULL) >= 0);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);
+
+	gnutls_transport_set_int(session, fd);
+
+	do {
+		ret = gnutls_handshake(session);
+	}
+	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+	if (ret != GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH) {
+		close(fd);
+		gnutls_deinit(session);
+		fail("server: Handshake did not fail with GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH (%s)\n\n",
+		     gnutls_strerror(ret));
+		terminate();
+	}
+
+	close(fd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(xcred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: Handshake failed as expected\n");
+}
+
+static void start(const char *prio)
+{
+	int fd[2];
+	int ret;
+
+	success("trying %s\n", prio);
+	signal(SIGPIPE, SIG_IGN);
+
+	ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
+	if (ret < 0) {
+		perror("socketpair");
+		exit(1);
+	}
+
+	child = fork();
+	if (child < 0) {
+		perror("fork");
+		fail("fork");
+		exit(1);
+	}
+
+	if (child) {
+		int status;
+		/* parent */
+
+		close(fd[0]);
+		server(fd[1], prio);
+
+		wait(&status);
+		check_wait_status(status);
+		close(fd[1]);
+	} else {
+		close(fd[1]);
+		client(fd[0], prio);
+		exit(0);
+	}
+}
+
+void doit(void)
+{
+	success("checking overflow\n");
+	start("NORMAL:-VERS-ALL:+VERS-TLS1.2");
+	start("NORMAL:-VERS-ALL:+VERS-TLS1.3");
+	start("NORMAL");
+
+	success("checking underflow\n");
+	reduce = 1;
+	start("NORMAL:-VERS-ALL:+VERS-TLS1.2");
+	start("NORMAL:-VERS-ALL:+VERS-TLS1.3");
+	start("NORMAL");
+}
+#endif				/* _WIN32 */