tests: added check for handshake packet reconstruction

This tests whether a split handshake packet is properly reconstructed
if the parts are switched.

2 files changed, 387 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index adfa0601cc..61d2dea25b 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -108,7 +108,7 @@ ctests = mini-record-2 simple gc set_pkcs12_cred certder certuniqueid	\
 	 tls1.1-cert-key-exchange tls1.0-cert-key-exchange ssl3.0-cert-key-exchange \
 	 dtls1.2-cert-key-exchange dtls1.0-cert-key-exchange x509-cert-callback-legacy \
 	 keylog-env ssl2-hello tlsfeature-ext dtls-rehandshake-cert-2 \
-	 tlsfeature-crt
+	 tlsfeature-crt dtls-rehandshake-cert-3
 
 if HAVE_SECCOMP_TESTS
 ctests += dtls-with-seccomp tls-with-seccomp dtls-client-with-seccomp tls-client-with-seccomp
diff --git a/tests/dtls-rehandshake-cert-3.c b/tests/dtls-rehandshake-cert-3.c
new file mode 100644
index 0000000000..4021155b4b
--- /dev/null
+++ b/tests/dtls-rehandshake-cert-3.c
@@ -0,0 +1,386 @@
+/*
+ * Copyright (C) 2016 Red Hat, Inc.
+ * Copyright (C) 2016 Guillaume Roguez
+ *
+ * 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>
+
+#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 <assert.h>
+
+#include "cert-common.h"
+#include "utils.h"
+
+#define MTU 1500
+#define MAX_BUF 4096
+#define MSG "Hello TLS"
+
+static int server_fd = -1;
+static char pkt_buf[MAX_BUF];
+static int pkt_found = 0;
+static int pkt_delivered = 0;
+
+static void terminate(void);
+
+/* This program tests the rehandshake from anon
+ * to certificate auth in DTLS, but will account for
+ * packet reconstruction (with loss/delay) for the certificate packet.
+ */
+
+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 ssize_t push(gnutls_transport_ptr_t tr, const void *data, size_t len)
+{
+	int fd = (long int)tr;
+
+	if (fd == server_fd) {
+		if (!pkt_found && len > 1200) {
+			memcpy(pkt_buf, data, len);
+			pkt_found = 1;
+			if (debug)
+				success("*** packet delayed\n");
+			return len;
+		}
+		if (pkt_found && !pkt_delivered) {
+			int res = send(fd, data, len, 0);
+			send(fd, pkt_buf, MTU, 0);
+			pkt_delivered = 1;
+			if (debug)
+				success("*** swap done\n");
+			return res;
+		}
+	}
+
+	return send(fd, data, len, 0);
+}
+
+static void client(int fd)
+{
+	int ret;
+	char buffer[MAX_BUF + 1];
+	gnutls_certificate_credentials_t clientx509cred;
+	gnutls_anon_client_credentials_t anoncred;
+	gnutls_session_t session;
+
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(client_log_func);
+		gnutls_global_set_log_level(4711);
+	}
+
+	assert(gnutls_anon_allocate_client_credentials(&anoncred) >= 0);
+	assert(gnutls_certificate_allocate_credentials(&clientx509cred) >= 0);
+
+	/* Initialize TLS session
+	 */
+	gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM);
+	gnutls_dtls_set_mtu(session, MTU);
+
+	assert(gnutls_priority_set_direct(session,
+					  "NONE:+VERS-DTLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL",
+					  NULL) >= 0);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, clientx509cred);
+
+	gnutls_transport_set_int(session, fd);
+	gnutls_transport_set_push_function(session, push);
+	gnutls_dtls_set_timeouts(session, 2000, 30 * 1000);
+
+	/* 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)));
+
+	/* update priorities to allow cert auth */
+	assert(gnutls_priority_set_direct(session,
+					  "NONE:+VERS-DTLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ECDHE-RSA:+CURVE-ALL",
+					  NULL) >= 0);
+
+	do {
+		ret = gnutls_record_recv(session, buffer, MAX_BUF);
+	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+
+	if (ret == 0) {
+		if (debug)
+			success("client: Peer has closed the TLS connection\n");
+		goto end;
+	} else if (ret < 0) {
+		if (ret == GNUTLS_E_REHANDSHAKE) {
+			if (debug)
+				success
+				    ("Initiating rehandshake due to server request\n");
+			do {
+				ret = gnutls_handshake(session);
+			}
+			while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+		}
+
+		if (ret != 0) {
+			fail("client: Error: %s\n", gnutls_strerror(ret));
+			exit(1);
+		}
+	}
+
+	do {
+		ret = gnutls_record_send(session, MSG, strlen(MSG));
+	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+	gnutls_bye(session, GNUTLS_SHUT_WR);
+
+ end:
+
+	close(fd);
+
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(clientx509cred);
+	gnutls_anon_free_client_credentials(anoncred);
+
+	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;
+	char buffer[MAX_BUF + 1];
+	gnutls_certificate_credentials_t serverx509cred;
+	gnutls_anon_server_credentials_t anoncred;
+	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);
+	}
+
+	assert(gnutls_anon_allocate_server_credentials(&anoncred) >= 0);
+	assert(gnutls_certificate_allocate_credentials(&serverx509cred) >= 0);
+	assert(gnutls_certificate_set_x509_key_mem(serverx509cred,
+						   &server_cert, &server_key,
+						   GNUTLS_X509_FMT_PEM) >= 0);
+
+	gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);
+	gnutls_dtls_set_mtu(session, MTU);
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	assert(gnutls_priority_set_direct(session,
+					  "NONE:+VERS-DTLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ECDHE-RSA:+ANON-ECDH:+CURVE-ALL",
+					  NULL) >= 0);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, serverx509cred);
+
+	gnutls_transport_set_int(session, fd);
+	gnutls_transport_set_push_function(session, push);
+
+	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)));
+
+	if (gnutls_kx_get(session) != GNUTLS_KX_ANON_ECDH) {
+		fail("did not negotiate an anonymous ciphersuite on initial auth\n");
+	}
+
+	/* see the Getting peer's information example */
+	/* print_info(session); */
+
+	if (debug)
+		success("server: Sending dummy packet\n");
+	ret = gnutls_rehandshake(session);
+	if (ret < 0) {
+		fail("gnutls_rehandshake: %s\n", gnutls_strerror(ret));
+		terminate();
+	}
+
+	if (debug)
+		success("server: Initiating rehandshake\n");
+	do {
+		ret = gnutls_handshake(session);
+	}
+	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+	if (ret < 0) {
+		fail("server: 2nd gnutls_handshake: %s\n",
+		     gnutls_strerror(ret));
+		terminate();
+	}
+
+	for (;;) {
+		memset(buffer, 0, MAX_BUF + 1);
+
+		do {
+			ret = gnutls_record_recv(session, buffer, MAX_BUF);
+		} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+
+		if (ret == 0) {
+			if (debug)
+				success
+				    ("server: Peer has closed the GnuTLS connection\n");
+			break;
+		} else if (ret < 0) {
+			fail("server: Received corrupted data(%s). Closing...\n", gnutls_strerror(ret));
+			terminate();
+		} else if (ret > 0) {
+			/* echo data back to the client
+			 */
+			do {
+				ret =
+				    gnutls_record_send(session, buffer,
+						       strlen(buffer));
+			} while (ret == GNUTLS_E_AGAIN
+				 || ret == GNUTLS_E_INTERRUPTED);
+		}
+	}
+
+	if (gnutls_kx_get(session) != GNUTLS_KX_ECDHE_RSA) {
+		fail("did not negotiate a certificate ciphersuite on second auth\n");
+	}
+
+	/* 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(serverx509cred);
+	gnutls_anon_free_server_credentials(anoncred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: finished\n");
+}
+
+void doit(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 = 0;
+		/* parent */
+
+		server_fd = fd[0];
+		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);
+	}
+}
+
+#endif				/* _WIN32 */