1 files changed, 305 insertions, 0 deletions
diff --git a/tests/tls13/rnd-check-rollback-val.c b/tests/tls13/rnd-check-rollback-val.c
new file mode 100644
index 0000000..ea61728
--- /dev/null
+++ b/tests/tls13/rnd-check-rollback-val.c
@@ -0,0 +1,305 @@
+/*
+ * 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 <https://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;
+	unsigned try = 0;
+	gnutls_datum_t session_data = { NULL, 0 };
+
+	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);
+
+ retry:
+	/* Initialize TLS session
+	 */
+	gnutls_init(&session, GNUTLS_CLIENT);
+
+	gnutls_handshake_set_timeout(session, get_timeout());
+
+	ret = gnutls_priority_set_direct(session, PRIO, NULL);
+	if (ret < 0)
+		fail("cannot set TLS priorities\n");
+
+	if (try > 0)
+		gnutls_session_set_data(session, session_data.data, session_data.size);
+
+	/* 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));
+	}
+
+	if (try > 0)
+		assert(gnutls_session_is_resumed(session));
+
+	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);
+	}
+
+	do {
+		ret = gnutls_record_send(session, "\x00", 1);
+	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+
+	if (try == 0) {
+		ret = gnutls_session_get_data2(session, &session_data);
+		if (ret < 0)
+			fail("couldn't retrieve session data: %s\n",
+			     gnutls_strerror(ret));
+	}
+
+	gnutls_deinit(session);
+
+	if (try == 0) {
+		try++;
+		goto retry;
+	}
+
+	close(fd);
+
+	gnutls_free(session_data.data);
+
+	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;
+	gnutls_datum_t skey;
+	unsigned try = 0;
+	unsigned char buf[16];
+
+	/* 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);
+
+	assert(gnutls_session_ticket_key_generate(&skey) >= 0);
+
+ retry:
+	gnutls_init(&session, GNUTLS_SERVER);
+
+	gnutls_handshake_set_timeout(session, get_timeout());
+
+	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);
+
+	assert(gnutls_session_ticket_enable_server(session, &skey) >= 0);
+
+	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));
+
+	if (try > 0)
+		assert(gnutls_session_is_resumed(session));
+
+	do {
+		ret = gnutls_record_recv(session, buf, sizeof(buf));
+	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+
+	if (ret < 0)
+		fail("server: recv did not succeed as expected: %s\n", gnutls_strerror(ret));
+
+	gnutls_deinit(session);
+
+	if (try == 0) {
+		try++;
+		goto retry;
+	}
+
+	close(fd);
+
+	gnutls_free(skey.data);
+	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 = 0;
+	wait(&status);
+	check_wait_status(status);
+	return;
+}
+
+void doit(void)
+{
+	int fd[2];
+	int ret;
+	pid_t child;
+
+	signal(SIGCHLD, ch_handler);
+	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) {
+		/* parent */
+		close(fd[1]);
+		client(fd[0]);
+		kill(child, SIGTERM);
+	} else {
+		close(fd[0]);
+		server(fd[1]);
+		exit(0);
+	}
+}
+
+#endif				/* _WIN32 */