From: Nikos Mavrogiannopoulos <nmav@redhat.com>
Date: Tue, 29 Mar 2016 14:11:36 +0000 (+0200)
Subject: tests: check gnutls_record_get_state() with DTLS
X-Git-Tag: gnutls_3_5_0~224
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2aa0a209756059e098c344617f4b3bf5e4eab9d;p=thirdparty%2Fgnutls.git

tests: check gnutls_record_get_state() with DTLS

Since in DTLS we relied on a sliding window to keep track of the
sequence numbers we didn't provide a sensible value to application
via gnutls_record_get_state(). This test makes sure that we report
the "correct" value when asked. Correct being the next number after
the last received packet.
---

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 15fbaee99d..ff7b689311 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -96,7 +96,7 @@ ctests = mini-record-2 simple gc set_pkcs12_cred certder certuniqueid	\
 	 rehandshake-switch-cert-client-allow handshake-versions dtls-handshake-versions \
 	 dtls-max-record tls-max-record alpn-server-prec ocsp-filename-memleak \
 	 dh-params rehandshake-ext-secret pcert-list session-export-funcs \
-	 handshake-false-start version-checks
+	 handshake-false-start version-checks key-material-dtls
 
 if HAVE_SECCOMP_TESTS
 ctests += dtls-with-seccomp tls-with-seccomp dtls-client-with-seccomp tls-client-with-seccomp
diff --git a/tests/key-material-dtls.c b/tests/key-material-dtls.c
new file mode 100644
index 0000000000..0d9334d1a1
--- /dev/null
+++ b/tests/key-material-dtls.c
@@ -0,0 +1,405 @@
+/*
+ * Copyright (C) 2016 Red Hat, Inc.
+ * Copyright (C) 2013-2016 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>
+
+#if defined(_WIN32) || !defined(ENABLE_ALPN)
+
+int main(int argc, char **argv)
+{
+	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 <gnutls/gnutls.h>
+#include <gnutls/dtls.h>
+
+#include "utils.h"
+
+static void terminate(void);
+
+/* This program tests whether the gnutls_record_get_state() works as
+ * expected.
+ */
+
+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);
+}
+
+/* These are global */
+static pid_t child;
+
+/* A very basic DTLS client, with anonymous authentication, that negotiates SRTP
+ */
+
+static void dump(const char *name, uint8_t *data, unsigned data_size)
+{
+	unsigned i;
+
+	fprintf(stderr, "%s", name);
+	for (i=0;i<data_size;i++)
+		fprintf(stderr, "%.2x", (unsigned)data[i]);
+	fprintf(stderr, "\n");
+}
+
+static void terminate(void)
+{
+	int status = 0;
+
+	kill(child, SIGTERM);
+	wait(&status);
+	exit(1);
+}
+
+static void client(int fd)
+{
+	gnutls_session_t session;
+	int ret;
+	gnutls_anon_client_credentials_t anoncred;
+	gnutls_datum_t mac_key, iv, cipher_key;
+	gnutls_datum_t read_mac_key, read_iv, read_cipher_key;
+	unsigned char rseq_number[8];
+	unsigned char wseq_number[8];
+	unsigned char key_material[512], *p;
+	unsigned i;
+	unsigned block_size, hash_size, key_size, iv_size;
+	const char *err;
+	/* Need to enable anonymous KX specifically. */
+
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(client_log_func);
+		gnutls_global_set_log_level(4711);
+	}
+
+	gnutls_anon_allocate_client_credentials(&anoncred);
+
+	/* Initialize TLS session
+	 */
+	gnutls_init(&session, GNUTLS_CLIENT|GNUTLS_DATAGRAM);
+
+	/* Use default priorities */
+	ret = gnutls_priority_set_direct(session,
+				   "NONE:+VERS-DTLS1.0:+AES-128-CBC:+SHA1:+SIGN-ALL:+COMP-NULL:+ANON-DH:+ANON-ECDH:+CURVE-ALL",
+				   &err);
+	if (ret < 0) {
+		fail("client: priority set failed (%s): %s\n",
+		     gnutls_strerror(ret), err);
+		exit(1);
+	}
+
+	/* put the anonymous credentials to the current session
+	 */
+	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
+
+	gnutls_transport_set_int(session, fd);
+
+	/* 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: %s\n", strerror(ret));
+		terminate();
+	} 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)));
+
+	ret = gnutls_cipher_get(session);
+	if (ret != GNUTLS_CIPHER_AES_128_CBC) {
+		fprintf(stderr, "negotiated unexpected cipher: %s\n", gnutls_cipher_get_name(ret));
+		terminate();
+	}
+
+	ret = gnutls_mac_get(session);
+	if (ret != GNUTLS_MAC_SHA1) {
+		fprintf(stderr, "negotiated unexpected mac: %s\n", gnutls_mac_get_name(ret));
+		terminate();
+	}
+
+	iv_size = 16;
+	hash_size = 20;
+	key_size = 16;
+	block_size = 2*hash_size + 2*key_size + 2 *iv_size;
+
+	ret = gnutls_prf(session, 13, "key expansion", 1, 0, NULL, block_size,
+                         (void*)key_material);
+	if (ret < 0) {
+		fprintf(stderr, "error in %d\n", __LINE__);
+		gnutls_perror(ret);
+		terminate();
+	}
+	p = key_material;
+
+	/* check whether the key material matches our calculations */
+	ret = gnutls_record_get_state(session, 0, &mac_key, &iv, &cipher_key, wseq_number);
+	if (ret < 0) {
+		fprintf(stderr, "error in %d\n", __LINE__);
+		gnutls_perror(ret);
+		terminate();
+	}
+
+	if (memcmp(wseq_number, "\x00\x01\x00\x00\x00\x00\x00\x01", 8) != 0) {
+		dump("wseq:", wseq_number, 8);
+		fprintf(stderr, "error in %d\n", __LINE__);
+		terminate();
+	}
+
+	ret = gnutls_record_get_state(session, 1, &read_mac_key, &read_iv, &read_cipher_key, rseq_number);
+	if (ret < 0) {
+		fprintf(stderr, "error in %d\n", __LINE__);
+		gnutls_perror(ret);
+		terminate();
+	}
+
+	if (memcmp(rseq_number, "\x00\x01\x00\x00\x00\x00\x00\x01", 8) != 0) {
+		dump("rseq:", rseq_number, 8);
+		fprintf(stderr, "error in %d\n", __LINE__);
+		terminate();
+	}
+
+	if (hash_size != mac_key.size || memcmp(p, mac_key.data, hash_size) != 0) {
+		dump("MAC:", mac_key.data, mac_key.size);
+		dump("Block:", key_material, block_size);
+		fprintf(stderr, "error in %d\n", __LINE__);
+		terminate();
+	}
+	p+= hash_size;
+
+	if (hash_size != read_mac_key.size || memcmp(p, read_mac_key.data, hash_size) != 0) {
+		dump("MAC:", read_mac_key.data, read_mac_key.size);
+		dump("Block:", key_material, block_size);
+		fprintf(stderr, "error in %d\n", __LINE__);
+		terminate();
+	}
+	p+= hash_size;
+
+	if (key_size != cipher_key.size || memcmp(p, cipher_key.data, key_size) != 0) {
+		fprintf(stderr, "error in %d\n", __LINE__);
+		terminate();
+	}
+	p+= key_size;
+
+	if (key_size != read_cipher_key.size || memcmp(p, read_cipher_key.data, key_size) != 0) {
+		fprintf(stderr, "error in %d\n", __LINE__);
+		terminate();
+	}
+	p+= key_size;
+
+	/* check sequence numbers */
+	for (i=0;i<5;i++) {
+		ret = gnutls_record_send(session, "hello", 5);
+		if (ret < 0) {
+			fail("gnutls_record_send: %s\n", gnutls_strerror(ret));
+		}
+	}
+
+	memset(wseq_number, 0xAA, sizeof(wseq_number));
+	ret = gnutls_record_get_state(session, 0, NULL, NULL, NULL, wseq_number);
+	if (ret < 0) {
+		fprintf(stderr, "error in %d\n", __LINE__);
+		gnutls_perror(ret);
+		terminate();
+	}
+
+	if (memcmp(wseq_number, "\x00\x01\x00\x00\x00\x00\x00\x06", 8) != 0) {
+		dump("wseq:", wseq_number, 8);
+		fprintf(stderr, "error in %d\n", __LINE__);
+		terminate();
+	}
+
+	memset(rseq_number, 0xAA, sizeof(rseq_number));
+	ret = gnutls_record_get_state(session, 1, NULL, NULL, NULL, rseq_number);
+	if (ret < 0) {
+		fprintf(stderr, "error in %d\n", __LINE__);
+		gnutls_perror(ret);
+		terminate();
+	}
+
+	if (memcmp(rseq_number, "\x00\x01\x00\x00\x00\x00\x00\x01", 8) != 0) {
+		dump("rseq:", rseq_number, 8);
+		fprintf(stderr, "error in %d\n", __LINE__);
+		terminate();
+	}
+	gnutls_bye(session, GNUTLS_SHUT_WR);
+
+	close(fd);
+
+	gnutls_deinit(session);
+
+	gnutls_anon_free_client_credentials(anoncred);
+
+	gnutls_global_deinit();
+}
+
+static void server(int fd)
+{
+	int ret;
+	gnutls_session_t session;
+	gnutls_anon_server_credentials_t anoncred;
+	gnutls_dh_params_t dh_params;
+	char buf[128];
+	const gnutls_datum_t p3 =
+	    { (unsigned char *) pkcs3, strlen(pkcs3) };
+
+	/* 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_anon_allocate_server_credentials(&anoncred);
+	gnutls_dh_params_init(&dh_params);
+	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);
+	gnutls_anon_set_server_dh_params(anoncred, dh_params);
+
+	gnutls_init(&session, GNUTLS_SERVER|GNUTLS_DATAGRAM);
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	ret = gnutls_priority_set_direct(session,
+				   "NORMAL:+ANON-DH:+ANON-ECDH", NULL);
+	if (ret < 0) {
+		fail("server: priority set failed (%s)\n\n",
+		     gnutls_strerror(ret));
+		terminate();
+	}
+
+	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
+
+	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 {
+		ret = gnutls_record_recv(session, buf, sizeof(buf));
+	} while(ret > 0);
+
+	if (ret < 0) {
+		fail("error: %s\n", gnutls_strerror(ret));
+	}
+
+	/* do not wait for the peer to close the connection.
+	 */
+	gnutls_bye(session, GNUTLS_SHUT_WR);
+
+	close(fd);
+	gnutls_deinit(session);
+
+	gnutls_anon_free_server_credentials(anoncred);
+	gnutls_dh_params_deinit(dh_params);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: finished\n");
+}
+
+static void start(void)
+{
+	int fd[2];
+	int ret;
+
+	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 */
+
+		server(fd[0]);
+		wait(&status);
+		if (WEXITSTATUS(status) != 0)
+			fail("Child died with status %d\n",
+			     WEXITSTATUS(status));
+	} else {
+		close(fd[0]);
+		client(fd[1]);
+		exit(0);
+	}
+}
+
+void doit(void)
+{
+	start();
+}
+
+#endif				/* _WIN32 */