tests: added check to ensure that DTLS handshake packets will not exceed MTU

2 files changed, 364 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0a70f2e621..565ed98447 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -86,7 +86,7 @@ ctests = mini-record-2 simple gc set_pkcs12_cred certder certuniqueid	\
 	 long-session-id mini-x509-callbacks-intr mini-dtls-lowmtu \
 	 crlverify mini-dtls-discard init_fds mini-record-failure \
 	 mini-rehandshake-2 custom-urls set_x509_key_mem set_x509_key_file \
-	 mini-chain-unsorted x509-verify-with-crl
+	 mini-chain-unsorted x509-verify-with-crl mini-dtls-mtu
 
 if ENABLE_OCSP
 ctests += ocsp
diff --git a/tests/mini-dtls-mtu.c b/tests/mini-dtls-mtu.c
new file mode 100644
index 0000000000..f6b2586c80
--- /dev/null
+++ b/tests/mini-dtls-mtu.c
@@ -0,0 +1,363 @@
+/*
+ * Copyright (C) 2014 Nikos Mavrogiannopoulos, Andreas Schultz
+ *
+ * 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 <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/dtls.h>
+#include <signal.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include "utils.h"
+
+#define SERVER_MTU  500
+
+#ifdef _WIN32
+
+void doit(void)
+{
+	exit(77);
+}
+
+#else
+
+/* Tests whether packing multiple DTLS records in a single UDP packet
+ * will be handled correctly.
+ */
+
+const char *side = "";
+
+static void tls_log_func(int level, const char *str)
+{
+	fprintf(stderr, "%s|<%d>| %s", side, level, str);
+}
+
+static unsigned char server_cert_pem[] =
+  "-----BEGIN CERTIFICATE-----\n"
+  "MIICHzCCAaWgAwIBAgIBCTAKBggqhkjOPQQDAjA+MQswCQYDVQQGEwJOTDERMA8G\n"
+  "A1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0EwHhcN\n"
+  "MTMwOTI0MTU1MjA0WhcNMjMwOTIyMTU1MjA0WjA0MQswCQYDVQQGEwJOTDERMA8G\n"
+  "A1UEChMIUG9sYXJTU0wxEjAQBgNVBAMTCWxvY2FsaG9zdDBZMBMGByqGSM49AgEG\n"
+  "CCqGSM49AwEHA0IABDfMVtl2CR5acj7HWS3/IG7ufPkGkXTQrRS192giWWKSTuUA\n"
+  "2CMR/+ov0jRdXRa9iojCa3cNVc2KKg76Aci07f+jgZ0wgZowCQYDVR0TBAIwADAd\n"
+  "BgNVHQ4EFgQUUGGlj9QH2deCAQzlZX+MY0anE74wbgYDVR0jBGcwZYAUnW0gJEkB\n"
+  "PyvLeLUZvH4kydv7NnyhQqRAMD4xCzAJBgNVBAYTAk5MMREwDwYDVQQKEwhQb2xh\n"
+  "clNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBFQyBDQYIJAMFD4n5iQ8zoMAoG\n"
+  "CCqGSM49BAMCA2gAMGUCMQCaLFzXptui5WQN8LlO3ddh1hMxx6tzgLvT03MTVK2S\n"
+  "C12r0Lz3ri/moSEpNZWqPjkCMCE2f53GXcYLqyfyJR078c/xNSUU5+Xxl7VZ414V\n"
+  "fGa5kHvHARBPc8YAIVIqDvHH1Q==\n"
+  "-----END CERTIFICATE-----\n";
+
+const gnutls_datum_t server_cert = { server_cert_pem,
+	sizeof(server_cert_pem)
+};
+
+static unsigned char server_key_pem[] =
+  "-----BEGIN EC PRIVATE KEY-----\n"
+  "MHcCAQEEIPEqEyB2AnCoPL/9U/YDHvdqXYbIogTywwyp6/UfDw6noAoGCCqGSM49\n"
+  "AwEHoUQDQgAEN8xW2XYJHlpyPsdZLf8gbu58+QaRdNCtFLX3aCJZYpJO5QDYIxH/\n"
+  "6i/SNF1dFr2KiMJrdw1VzYoqDvoByLTt/w==\n"
+  "-----END EC PRIVATE KEY-----\n";
+
+const gnutls_datum_t server_key = { server_key_pem,
+	sizeof(server_key_pem)
+};
+
+static int client_pull_timeout(gnutls_transport_ptr_t ptr, unsigned int ms)
+{
+        fd_set rfds;
+        struct timeval tv;
+        int ret;
+        int fd = (long int)ptr;
+
+        FD_ZERO(&rfds);
+        FD_SET(fd, &rfds);
+
+        tv.tv_sec = 0;
+        tv.tv_usec = ms * 1000;
+
+        while (tv.tv_usec >= 1000000) {
+                tv.tv_usec -= 1000000;
+                tv.tv_sec++;
+        }
+
+        ret = select(fd + 1, &rfds, NULL, NULL, &tv);
+        if (ret <= 0)
+                return ret;
+
+        return ret;
+}
+
+static ssize_t client_pull(gnutls_transport_ptr_t ptr, void *data, size_t len)
+{
+        int fd = (long int)ptr;
+	ssize_t ret;
+
+	ret = recv(fd, data, len, 0);
+	if (ret > SERVER_MTU) {
+		fail("client: packet size beyond server MTU, got %zd bytes, expect max. %d bytes\n", ret, SERVER_MTU);
+		exit(1);
+	}
+
+	return ret;
+}
+
+static void client(int fd)
+{
+	int ret;
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_session_t session;
+	/* Need to enable anonymous KX specifically. */
+
+	global_init();
+
+	if (debug) {
+		side = "client";
+		gnutls_global_set_log_function(tls_log_func);
+		gnutls_global_set_log_level(4711);
+	}
+
+	gnutls_certificate_allocate_credentials(&x509_cred);
+
+	/* Initialize TLS session
+	 */
+	gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM);
+	gnutls_dtls_set_mtu(session, 1500);
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	/* Use default priorities */
+	gnutls_priority_set_direct(session,
+				   "NONE:+VERS-DTLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ECDHE-ECDSA:+CURVE-ALL",
+				   NULL);
+
+	/* put the anonymous credentials to the current session
+	 */
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	gnutls_transport_set_int(session, fd);
+        gnutls_transport_set_pull_function(session, client_pull);
+	gnutls_transport_set_pull_timeout_function(session, client_pull_timeout);
+
+	/* Perform the TLS handshake
+	 */
+	do {
+		ret = gnutls_handshake(session);
+	}
+	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+	if (ret < 0) {
+		fail("client: Handshake failed\n");
+		gnutls_perror(ret);
+		exit(1);
+	} else {
+		if (debug)
+			success("client: Handshake was completed\n");
+	}
+
+	if (debug)
+		success("client: TLS version is: %s\n",
+			gnutls_protocol_get_name
+			(gnutls_protocol_get_version(session)));
+
+	gnutls_bye(session, GNUTLS_SHUT_WR);
+
+	close(fd);
+
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+}
+
+/* These are global */
+pid_t child;
+
+static void terminate(void)
+{
+	int status;
+
+	kill(child, SIGTERM);
+	wait(&status);
+	exit(1);
+}
+
+static void server(int fd)
+{
+	int ret;
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_session_t session;
+
+	/* this must be called once in the program
+	 */
+	global_init();
+
+	if (debug) {
+		side = "server";
+		gnutls_global_set_log_function(tls_log_func);
+		gnutls_global_set_log_level(4711);
+	}
+
+	gnutls_certificate_allocate_credentials(&x509_cred);
+	gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,
+					    &server_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+	gnutls_dtls_set_mtu(session, SERVER_MTU);
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	gnutls_priority_set_direct(session,
+				   "NONE:+VERS-DTLS1.2:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ECDHE-ECDSA:+CURVE-ALL",
+				   NULL);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	gnutls_transport_set_int(session, fd);
+
+	do {
+		ret = gnutls_handshake(session);
+	}
+	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+	if (ret < 0) {
+		close(fd);
+		gnutls_deinit(session);
+		fail("server: Handshake has failed (%s)\n\n",
+		     gnutls_strerror(ret));
+		terminate();
+	}
+	if (debug)
+		success("server: Handshake was completed\n");
+
+	if (debug)
+		success("server: TLS version is: %s\n",
+			gnutls_protocol_get_name
+			(gnutls_protocol_get_version(session)));
+
+	/* do not wait for the peer to close the connection.
+	 */
+	gnutls_bye(session, GNUTLS_SHUT_WR);
+
+	close(fd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: finished\n");
+}
+
+static int udp_socket(void)
+{
+        int on = 1;
+	struct sockaddr_in addr = {
+		.sin_family = AF_INET,
+		.sin_addr = {htonl(INADDR_LOOPBACK)},
+		.sin_port = 0
+	};
+	int fd;
+
+	fd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+        setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&on, sizeof(on));
+#if defined(SO_REUSEPORT)
+        setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char*)&on, sizeof(on));
+#endif
+
+	if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+                perror("bind");
+                exit(EXIT_FAILURE);
+	}
+
+	return fd;
+}
+
+static void udp_connect(int fd1, int fd2)
+{
+	struct sockaddr_in addr;
+	socklen_t addrlen = sizeof(addr);
+
+	if (getsockname(fd1, &addr, &addrlen) < 0) {
+                perror("getsockname");
+                exit(EXIT_FAILURE);
+	}
+
+	if (connect(fd2, &addr, addrlen) < 0) {
+                perror("connect");
+                exit(EXIT_FAILURE);
+	}
+}
+
+static int udp_socketpair(int *fd)
+{
+	fd[0] = udp_socket();
+	fd[1] = udp_socket();
+
+	udp_connect(fd[0], fd[1]);
+	udp_connect(fd[1], fd[0]);
+
+	return 0;
+}
+
+void doit(void)
+{
+	int fd[2];
+
+	udp_socketpair(fd);
+
+	child = fork();
+	if (child < 0) {
+		perror("fork");
+		fail("fork");
+		exit(1);
+	}
+
+	if (child) {
+		int status;
+		/* parent */
+
+		close(fd[0]);
+		server(fd[1]);
+		wait(&status);
+		if (WEXITSTATUS(status) != 0)
+			fail("Child died with status %d\n",
+			     WEXITSTATUS(status));
+	} else {
+		close(fd[1]);
+		client(fd[0]);
+		exit(0);
+	}
+}
+
+#endif				/* _WIN32 */