tests: added tests for TLS1.2- rollback detection

That is, tests which check
 * whether the server's generated values under TLS1.2- match the expected
 * whether the client would fail on negotiation if the rollback values are detected

Resolves #293

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

3 files changed, 506 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6d1a106e2c..39b3e27e80 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -93,7 +93,8 @@ indirect_tests =
 
 ctests = tls13/supported_versions tls13/tls12-no-tls13-exts \
 	tls13/post-handshake-with-cert tls13/post-handshake-without-cert \
-	tls13/cookie
+	tls13/cookie tls12-rollback-detection tls11-rollback-detection \
+	tls12-check-rollback-val tls11-check-rollback-val
 
 ctests += mini-record-2 simple gc set_pkcs12_cred cert certuniqueid tls-neg-ext-key \
 	 mpi certificate_set_x509_crl dn parse_ca x509-dn x509-dn-decode record-sizes \
@@ -186,6 +187,22 @@ endif
 mini_dtls_pthread_LDADD = $(LDADD) -lpthread
 rng_pthread_LDADD = $(LDADD) -lpthread
 
+tls12_rollback_detection_CFLAGS = -DTLS12
+tls12_rollback_detection_SOURCES = tls13/rnd-rollback-detection.c
+tls12_rollback_detection_LDADD = $(LDADD) ../gl/libgnu.la
+
+tls11_rollback_detection_CFLAGS = -DTLS11
+tls11_rollback_detection_SOURCES = tls13/rnd-rollback-detection.c
+tls11_rollback_detection_LDADD = $(LDADD) ../gl/libgnu.la
+
+tls12_check_rollback_val_CFLAGS = -DTLS12
+tls12_check_rollback_val_SOURCES = tls13/rnd-check-rollback-val.c
+tls12_check_rollback_val_LDADD = $(LDADD) ../gl/libgnu.la
+
+tls11_check_rollback_val_CFLAGS = -DTLS11
+tls11_check_rollback_val_SOURCES = tls13/rnd-check-rollback-val.c
+tls11_check_rollback_val_LDADD = $(LDADD) ../gl/libgnu.la
+
 # These tests need gnulib for memmem()
 tls12_resume_psk_CFLAGS = -DUSE_PSK -DTLS12
 tls12_resume_psk_SOURCES = resume.c
diff --git a/tests/tls13/rnd-check-rollback-val.c b/tests/tls13/rnd-check-rollback-val.c
new file mode 100644
index 0000000000..5971bdb2f6
--- /dev/null
+++ b/tests/tls13/rnd-check-rollback-val.c
@@ -0,0 +1,252 @@
+/*
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * 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 Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#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 <gnutls/gnutls.h>
+#include <gnutls/dtls.h>
+#include <signal.h>
+#include <assert.h>
+
+#include "cert-common.h"
+#include "utils.h"
+
+/* This program checks whether a TLS 1.3 client will detect
+ * a TLS 1.2 rollback attempt via the server random value.
+ */
+
+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);
+}
+
+#ifdef TLS12
+# define name "TLS1.2"
+# define RND tls12_rnd
+# define PRIO "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.2"
+#elif TLS11
+# define name "TLS1.1"
+# define RND tls11_rnd
+# define PRIO "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.1:+VERS-TLS1.0"
+#else
+# error unknown version to test
+#endif
+
+gnutls_datum_t tls12_rnd = {(void*)"\x44\x4F\x57\x4E\x47\x52\x44\x01",
+			      8};
+
+gnutls_datum_t tls11_rnd = {(void*)"\x44\x4F\x57\x4E\x47\x52\x44\x00",
+			      8};
+
+
+static void client(int fd)
+{
+	int ret;
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_session_t session;
+	gnutls_datum_t srandom;
+
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(client_log_func);
+		gnutls_global_set_log_level(7);
+	}
+
+	gnutls_certificate_allocate_credentials(&x509_cred);
+	gnutls_certificate_set_x509_key_mem(x509_cred, &cli_ca3_cert,
+					    &cli_ca3_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	/* Initialize TLS session
+	 */
+	gnutls_init(&session, GNUTLS_CLIENT);
+
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	ret = gnutls_priority_set_direct(session, PRIO, NULL);
+	if (ret < 0)
+		fail("cannot set TLS priorities\n");
+
+	/* put the anonymous credentials to the current session
+	 */
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	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("error in handshake: %s\n", gnutls_strerror(ret));
+	}
+
+	gnutls_session_get_random(session, NULL, &srandom);
+
+	if (srandom.size != 32)
+		fail("unexpected random size\n");
+
+	if (memcmp(&srandom.data[32-8], RND.data, 8) != 0) {
+		unsigned i;
+		printf("expected: ");
+		for (i=0;i<8;i++)
+			printf("%.2x", (unsigned)RND.data[i]);
+		printf("\n");
+		printf("got:      ");
+		for (i=0;i<8;i++)
+			printf("%.2x", (unsigned)srandom.data[32-8+i]);
+		printf("\n");
+		fail("unexpected random data for %s\n", name);
+	}
+
+	close(fd);
+
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+}
+
+
+static void server(int fd)
+{
+	int ret;
+	gnutls_session_t session;
+	gnutls_certificate_credentials_t x509_cred;
+
+	/* 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(&x509_cred);
+	gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,
+					    &server_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	gnutls_init(&session, GNUTLS_SERVER);
+
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	assert(gnutls_priority_set_direct(session, "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+VERS-TLS1.1:+VERS-TLS1.0", NULL)>=0);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	gnutls_transport_set_int(session, fd);
+
+	do {
+		ret = gnutls_handshake(session);
+		if (ret == GNUTLS_E_INTERRUPTED) { /* expected */
+			break;
+		}
+	} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+	if (ret < 0)
+		fail("error in handshake: %s\n", gnutls_strerror(ret));
+
+	close(fd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: client/server hello were verified\n");
+}
+
+static void ch_handler(int sig)
+{
+	int status;
+	wait(&status);
+	check_wait_status(status);
+	return;
+}
+
+void doit(void)
+{
+	int fd[2];
+	int ret;
+	pid_t child;
+
+	signal(SIGCHLD, ch_handler);
+
+	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) {
+		/* parent */
+		close(fd[1]);
+		client(fd[0]);
+		kill(child, SIGTERM);
+	} else {
+		close(fd[0]);
+		server(fd[1]);
+		exit(0);
+	}
+}
+
+#endif				/* _WIN32 */
diff --git a/tests/tls13/rnd-rollback-detection.c b/tests/tls13/rnd-rollback-detection.c
new file mode 100644
index 0000000000..7b136ea29a
--- /dev/null
+++ b/tests/tls13/rnd-rollback-detection.c
@@ -0,0 +1,236 @@
+/*
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * 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 Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#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 <gnutls/gnutls.h>
+#include <gnutls/dtls.h>
+#include <signal.h>
+#include <assert.h>
+
+#include "cert-common.h"
+#include "utils.h"
+
+/* This program checks whether a TLS 1.3 client will detect
+ * a TLS 1.2 rollback attempt via the server random value.
+ */
+
+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);
+}
+
+
+
+static void client(int fd)
+{
+	int ret;
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_session_t session;
+
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(client_log_func);
+		gnutls_global_set_log_level(7);
+	}
+
+	gnutls_certificate_allocate_credentials(&x509_cred);
+	gnutls_certificate_set_x509_key_mem(x509_cred, &cli_ca3_cert,
+					    &cli_ca3_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	/* Initialize TLS session
+	 */
+	gnutls_init(&session, GNUTLS_CLIENT);
+
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	ret = gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+VERS-TLS1.1:+VERS-TLS1.0", NULL);
+	if (ret < 0)
+		fail("cannot set TLS 1.2 priorities\n");
+
+	/* put the anonymous credentials to the current session
+	 */
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	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 != GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER) {
+		fail("unexpected error during rollback: %s\n", gnutls_strerror(ret));
+	}
+
+	close(fd);
+
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+}
+
+#ifdef TLS12
+# define RND tls12_rnd
+# define PRIO "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.2"
+#elif TLS11
+# define RND tls11_rnd
+# define PRIO "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.1:+VERS-TLS1.0"
+#else
+# error unknown version to test
+#endif
+
+gnutls_datum_t tls12_rnd = {(void*)"\x00\x00\x00\x04\x00\x00\x00\x04"
+			      "\x00\x00\x00\x04\x00\x00\x00\x04"
+			      "\x00\x00\x00\x04\x00\x00\x00\x04"
+			      "\x44\x4F\x57\x4E\x47\x52\x44\x01",
+			      32};
+
+gnutls_datum_t tls11_rnd = {(void*)"\x00\x00\x00\x04\x00\x00\x00\x04"
+			      "\x00\x00\x00\x04\x00\x00\x00\x04"
+			      "\x00\x00\x00\x04\x00\x00\x00\x04"
+			      "\x44\x4F\x57\x4E\x47\x52\x44\x00",
+			      32};
+
+static void server(int fd)
+{
+	int ret;
+	gnutls_session_t session;
+	gnutls_certificate_credentials_t x509_cred;
+
+	/* 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(&x509_cred);
+	gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,
+					    &server_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	gnutls_init(&session, GNUTLS_SERVER);
+
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+	gnutls_handshake_set_random(session, &RND);
+
+	assert(gnutls_priority_set_direct(session, PRIO, NULL)>=0);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	gnutls_transport_set_int(session, fd);
+
+	do {
+		ret = gnutls_handshake(session);
+		if (ret == GNUTLS_E_INTERRUPTED) { /* expected */
+			break;
+		}
+	} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+
+	close(fd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: client/server hello were verified\n");
+}
+
+static void ch_handler(int sig)
+{
+	int status;
+	wait(&status);
+	check_wait_status(status);
+	return;
+}
+
+void doit(void)
+{
+	int fd[2];
+	int ret;
+	pid_t child;
+
+	signal(SIGCHLD, ch_handler);
+
+	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) {
+		/* parent */
+		close(fd[1]);
+		client(fd[0]);
+		kill(child, SIGTERM);
+	} else {
+		close(fd[0]);
+		server(fd[1]);
+		exit(0);
+	}
+}
+
+#endif				/* _WIN32 */