tests: enhance padding check

This introduces tests for zero-data transfers with padding as well
as padding and de-padding with safe padding flag set.

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

1 files changed, 395 insertions, 0 deletions

diff --git a/tests/record-pad.c b/tests/record-pad.c
new file mode 100644
index 0000000000..3c2192dd6f
--- /dev/null
+++ b/tests/record-pad.c
@@ -0,0 +1,395 @@
+/*
+ * Copyright (C) 2012-2018 Free Software Foundation, Inc.
+ *
+ * Author: Nikos Mavrogiannopoulos, Daiki Ueno
+ *
+ * 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(void)
+{
+	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"
+
+#define MAX_BUF 1024
+#define HIGH(x) (3*x)
+static void terminate(void);
+static size_t total;
+
+/* This program tests the robustness of record sending with padding.
+ */
+
+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);
+}
+
+
+/* A very basic TLS client, with anonymous authentication.
+ */
+
+
+
+static ssize_t
+push(gnutls_transport_ptr_t tr, const void *data, size_t len)
+{
+	int fd = (long int) tr;
+
+	total += len;
+	return send(fd, data, len, 0);
+}
+
+struct test_st {
+	const char *name;
+	size_t pad;
+	size_t data;
+	const char *prio;
+	unsigned flags;
+};
+
+static void client(int fd, struct test_st *test)
+{
+	int ret;
+	char buffer[MAX_BUF + 1];
+	gnutls_anon_client_credentials_t anoncred;
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_session_t session;
+	/* Need to enable anonymous KX specifically. */
+
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(client_log_func);
+		gnutls_global_set_log_level(7);
+	}
+
+	gnutls_anon_allocate_client_credentials(&anoncred);
+	gnutls_certificate_allocate_credentials(&x509_cred);
+
+	assert(gnutls_init(&session, GNUTLS_CLIENT|test->flags)>=0);
+	assert(gnutls_priority_set_direct(session, test->prio, NULL)>=0);
+
+	/* put the anonymous credentials to the current session
+	 */
+	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
+	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("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)));
+
+	do {
+		do {
+			ret = gnutls_record_recv(session, buffer, sizeof(buffer));
+		} while (ret == GNUTLS_E_AGAIN
+			 || ret == GNUTLS_E_INTERRUPTED);
+	} while (ret > 0);
+
+	if (ret == 0) {
+		if (debug)
+			success
+			    ("client: Peer has closed the TLS connection\n");
+		goto end;
+	} else if (ret < 0) {
+		if (ret != 0) {
+			fail("client: Error: %s\n", gnutls_strerror(ret));
+			exit(1);
+		}
+	}
+
+	gnutls_bye(session, GNUTLS_SHUT_WR);
+
+      end:
+
+	close(fd);
+
+	gnutls_deinit(session);
+
+	gnutls_anon_free_client_credentials(anoncred);
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+}
+
+
+/* These are global */
+pid_t child;
+
+static void terminate(void)
+{
+	kill(child, SIGTERM);
+	exit(1);
+}
+
+static void server(int fd, struct test_st *test)
+{
+	int ret;
+	char buffer[MAX_BUF + 1];
+	gnutls_session_t session;
+	gnutls_anon_server_credentials_t anoncred;
+	gnutls_certificate_credentials_t x509_cred;
+	size_t expected;
+
+	/* this must be called once in the program
+	 */
+	global_init();
+	memset(buffer, 0, sizeof(buffer));
+
+	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_anon_allocate_server_credentials(&anoncred);
+
+	assert(gnutls_init(&session, GNUTLS_SERVER|test->flags)>=0);
+
+	assert(gnutls_priority_set_direct(session, test->prio, NULL)>=0);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
+	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)));
+
+	gnutls_transport_set_push_function(session, push);
+
+	assert(test->data <= sizeof(buffer));
+
+	total = 0;
+	do {
+		ret =
+		    gnutls_record_send2(session, buffer,
+					test->data,
+					test->pad, 0);
+	} while (ret == GNUTLS_E_AGAIN
+		 || ret == GNUTLS_E_INTERRUPTED);
+
+	if (ret < 0) {
+		fail("Error sending packet: %s\n",
+		     gnutls_strerror(ret));
+		terminate();
+	}
+
+	expected = test->data + test->pad + gnutls_record_overhead_size(session);
+	if (total != expected) {
+		fail("Sent data (%u) are lower than expected (%u)\n",
+		     (unsigned) total, (unsigned) expected);
+		terminate();
+	}
+
+	/* 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_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: finished\n");
+}
+
+static void start(struct test_st *test)
+{
+	int fd[2];
+	int ret;
+
+	success("running %s\n", test->name);
+
+	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]);
+		server(fd[0], test);
+		kill(child, SIGTERM);
+	} else {
+		close(fd[0]);
+		client(fd[1], test);
+		exit(0);
+	}
+}
+
+#define AES_GCM "NONE:+VERS-TLS1.3:+AES-256-GCM:+AEAD:+SIGN-ALL:+GROUP-ALL"
+
+static void ch_handler(int sig)
+{
+	int status;
+	wait(&status);
+	check_wait_status(status);
+	return;
+}
+
+struct test_st tests[] =
+{
+	{
+		.name = "AES-GCM with max pad",
+		.pad = HIGH(MAX_BUF+1)-(MAX_BUF+1),
+		.data = MAX_BUF,
+		.prio = AES_GCM,
+		.flags = 0
+	},
+	{
+		.name = "AES-GCM with zero pad",
+		.pad = 0,
+		.data = MAX_BUF,
+		.prio = AES_GCM,
+		.flags = 0
+	},
+	{
+		.name = "AES-GCM with 1-byte pad",
+		.pad = 1,
+		.data = MAX_BUF,
+		.prio = AES_GCM,
+		.flags = 0
+	},
+	{
+		.name = "AES-GCM with pad, but no data",
+		.pad = 16,
+		.data = 0,
+		.prio = AES_GCM,
+		.flags = 0
+	},
+	{
+		.name = "AES-GCM with max pad and safe padding check",
+		.pad = HIGH(MAX_BUF+1)-(MAX_BUF+1),
+		.data = MAX_BUF,
+		.prio = AES_GCM,
+		.flags = GNUTLS_SAFE_PADDING_CHECK
+	},
+	{
+		.name = "AES-GCM with zero pad and safe padding check",
+		.pad = 0,
+		.data = MAX_BUF,
+		.prio = AES_GCM,
+		.flags = GNUTLS_SAFE_PADDING_CHECK
+	},
+	{
+		.name = "AES-GCM with 1-byte pad and safe padding check",
+		.pad = 1,
+		.data = MAX_BUF,
+		.prio = AES_GCM,
+		.flags = GNUTLS_SAFE_PADDING_CHECK
+	},
+	{
+		.name = "AES-GCM with pad, but no data and safe padding check",
+		.pad = 16,
+		.data = 0,
+		.prio = AES_GCM,
+		.flags = GNUTLS_SAFE_PADDING_CHECK
+	},
+};
+
+void doit(void)
+{
+	unsigned i;
+	signal(SIGCHLD, ch_handler);
+
+	for (i=0;i<sizeof(tests)/sizeof(tests[0]);i++) {
+		start(&tests[i]);
+	}
+}
+
+#endif				/* _WIN32 */