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|
/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "tls/extensions/s2n_server_renegotiation_info.h"
#include <stdint.h>
#include "s2n_test.h"
#include "stuffer/s2n_stuffer.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_config.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls13.h"
#include "utils/s2n_safety.h"
S2N_RESULT s2n_server_renegotiation_info_extension_write(struct s2n_stuffer *out,
const uint8_t *client_verify_data, const uint8_t *server_verify_data, uint8_t verify_data_len)
{
RESULT_GUARD_POSIX(s2n_stuffer_growable_alloc(out, verify_data_len * 3));
struct s2n_stuffer_reservation len = { 0 };
RESULT_GUARD_POSIX(s2n_stuffer_reserve_uint8(out, &len));
RESULT_GUARD_POSIX(s2n_stuffer_write_bytes(out, client_verify_data, verify_data_len));
RESULT_GUARD_POSIX(s2n_stuffer_write_bytes(out, server_verify_data, verify_data_len));
RESULT_GUARD_POSIX(s2n_stuffer_write_vector_size(&len));
return S2N_RESULT_OK;
}
int main(int argc, char **argv)
{
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
DEFER_CLEANUP(struct s2n_cert_chain_and_key *chain_and_key = NULL, s2n_cert_chain_and_key_ptr_free);
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key,
S2N_DEFAULT_TEST_CERT_CHAIN, S2N_DEFAULT_TEST_PRIVATE_KEY));
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(config));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "default"));
const uint8_t client_verify_data[] = "client verify data";
const uint8_t server_verify_data[] = "server verify data";
EXPECT_EQUAL(sizeof(client_verify_data), sizeof(server_verify_data));
const uint8_t verify_data_len = sizeof(server_verify_data);
/* Test should_send
*
*= https://tools.ietf.org/rfc/rfc5746#3.6
*= type=test
*# o If the secure_renegotiation flag is set to TRUE, the server MUST
*# include an empty "renegotiation_info" extension in the ServerHello
*# message.
*/
{
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
/* TLS1.2 and secure renegotiation not enabled -> DON'T send */
conn->actual_protocol_version = S2N_TLS12;
conn->secure_renegotiation = false;
EXPECT_FALSE(s2n_server_renegotiation_info_extension.should_send(conn));
/* TLS1.3 and secure renegotiation not enabled -> DON'T send */
conn->actual_protocol_version = S2N_TLS13;
conn->secure_renegotiation = false;
EXPECT_FALSE(s2n_server_renegotiation_info_extension.should_send(conn));
/* TLS1.3 and secure renegotiation enabled -> DON'T send */
conn->actual_protocol_version = S2N_TLS13;
conn->secure_renegotiation = true;
EXPECT_FALSE(s2n_server_renegotiation_info_extension.should_send(conn));
/* TLS1.2 and secure renegotiation enabled -> send */
conn->actual_protocol_version = S2N_TLS12;
conn->secure_renegotiation = true;
EXPECT_TRUE(s2n_server_renegotiation_info_extension.should_send(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Test server_renegotiation_info send and recv during initial handshake
*
*= https://tools.ietf.org/rfc/rfc5746#4.3
*= type=test
*# In order to enable clients to probe, even servers that do not support
*# renegotiation MUST implement the minimal version of the extension
*# described in this document for initial handshakes, thus signaling
*# that they have been upgraded.
*/
{
struct s2n_connection *server_conn, *client_conn;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
struct s2n_stuffer extension = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
server_conn->actual_protocol_version = S2N_TLS12;
server_conn->secure_renegotiation = 1;
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.send(server_conn, &extension));
EXPECT_NOT_EQUAL(s2n_stuffer_data_available(&extension), 0);
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.recv(client_conn, &extension));
EXPECT_EQUAL(client_conn->secure_renegotiation, 1);
EXPECT_EQUAL(s2n_stuffer_data_available(&extension), 0);
EXPECT_SUCCESS(s2n_stuffer_free(&extension));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
}
/* Test server_renegotiation_info recv when using SSLv3
*
*= https://tools.ietf.org/rfc/rfc5746#4.5
*= type=test
*# Clients that support SSLv3 and offer secure renegotiation (either via SCSV or
*# "renegotiation_info") MUST accept the "renegotiation_info" extension
*# from the server, even if the server version is {0x03, 0x00}, and
*# behave as described in this specification.
*/
{
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
server_conn->actual_protocol_version = S2N_TLS12;
server_conn->secure_renegotiation = true;
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.send(server_conn, &extension));
EXPECT_NOT_EQUAL(s2n_stuffer_data_available(&extension), 0);
client_conn->client_protocol_version = S2N_SSLv3;
client_conn->actual_protocol_version = S2N_SSLv3;
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.recv(client_conn, &extension));
EXPECT_EQUAL(client_conn->secure_renegotiation, 1);
EXPECT_EQUAL(s2n_stuffer_data_available(&extension), 0);
};
/* Test server_renegotiation_info recv during initial handshake - extension too long */
{
struct s2n_connection *server_conn, *client_conn;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
struct s2n_stuffer extension = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
server_conn->actual_protocol_version = S2N_TLS12;
server_conn->secure_renegotiation = 1;
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.send(server_conn, &extension));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0));
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.recv(client_conn, &extension),
S2N_ERR_NON_EMPTY_RENEGOTIATION_INFO);
EXPECT_EQUAL(client_conn->secure_renegotiation, 0);
EXPECT_SUCCESS(s2n_stuffer_free(&extension));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Test server_renegotiation_info recv during initial handshake - extension length wrong
*
*= https://tools.ietf.org/rfc/rfc5746#3.4
*= type=test
*# * The client MUST then verify that the length of the
*# "renegotiated_connection" field is zero, and if it is not, MUST
*# abort the handshake (by sending a fatal handshake_failure alert).
*/
{
struct s2n_connection *client_conn;
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
struct s2n_stuffer extension = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 5));
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.recv(client_conn, &extension),
S2N_ERR_NON_EMPTY_RENEGOTIATION_INFO);
EXPECT_EQUAL(client_conn->secure_renegotiation, 0);
EXPECT_SUCCESS(s2n_stuffer_free(&extension));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
};
/* Test: if_missing during initial handshake is a no-op
*
*= https://tools.ietf.org/rfc/rfc5746#3.4
*= type=test
*# * If the extension is not present, the server does not support
*# secure renegotiation; set secure_renegotiation flag to FALSE.
*/
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.if_missing(conn));
EXPECT_FALSE(conn->secure_renegotiation);
};
/* Test: if_missing during renegotiation handshake is an error
*
*= https://tools.ietf.org/rfc/rfc5746#3.5
*= type=test
*# o When a ServerHello is received, the client MUST verify that the
*# "renegotiation_info" extension is present; if it is not, the
*# client MUST abort the handshake.
*/
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(conn);
conn->handshake.renegotiation = true;
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.if_missing(conn),
S2N_ERR_NO_RENEGOTIATION);
};
/* Test: recv during renegotiation handshake
*
*= https://tools.ietf.org/rfc/rfc5746#3.5
*= type=test
*# o The client MUST then verify that the first half of the
*# "renegotiated_connection" field is equal to the saved
*# client_verify_data value, and the second half is equal to the
*# saved server_verify_data value. If they are not, the client MUST
*# abort the handshake.
*/
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(conn);
conn->handshake.renegotiation = true;
conn->secure_renegotiation = true;
/* Setup verify_data */
EXPECT_MEMCPY_SUCCESS(conn->handshake.client_finished,
client_verify_data, sizeof(client_verify_data));
EXPECT_MEMCPY_SUCCESS(conn->handshake.server_finished,
server_verify_data, sizeof(server_verify_data));
conn->handshake.finished_len = verify_data_len;
uint8_t renegotiation_info_len = verify_data_len * 2;
/* Secure renegotiation not supported */
{
/* Write valid verify_data */
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_OK(s2n_server_renegotiation_info_extension_write(&extension,
client_verify_data, server_verify_data, verify_data_len));
conn->secure_renegotiation = false;
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.recv(conn, &extension),
S2N_ERR_NO_RENEGOTIATION);
};
/* Turn on secure renegotiation for the rest of the tests */
conn->secure_renegotiation = true;
/* Receive valid client and server verify_data */
{
/* Write valid verify_data */
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_OK(s2n_server_renegotiation_info_extension_write(&extension,
client_verify_data, server_verify_data, verify_data_len));
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.recv(conn, &extension));
};
/* Receive incorrect length: too small */
{
/* Write valid verify_data */
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_OK(s2n_server_renegotiation_info_extension_write(&extension,
client_verify_data, server_verify_data, verify_data_len));
/* Modify length */
EXPECT_SUCCESS(s2n_stuffer_rewrite(&extension));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, renegotiation_info_len - 1));
EXPECT_SUCCESS(s2n_stuffer_skip_write(&extension, renegotiation_info_len));
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.recv(conn, &extension),
S2N_ERR_BAD_MESSAGE);
};
/* Receive incorrect length: too large */
{
/* Write valid verify_data */
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_OK(s2n_server_renegotiation_info_extension_write(&extension,
client_verify_data, server_verify_data, verify_data_len));
/* Modify length */
EXPECT_SUCCESS(s2n_stuffer_rewrite(&extension));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, renegotiation_info_len + 1));
EXPECT_SUCCESS(s2n_stuffer_skip_write(&extension, renegotiation_info_len));
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.recv(conn, &extension),
S2N_ERR_BAD_MESSAGE);
};
/* Receive incorrect client_verify_data */
{
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_OK(s2n_server_renegotiation_info_extension_write(&extension,
server_verify_data, server_verify_data, verify_data_len));
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.recv(conn, &extension),
S2N_ERR_BAD_MESSAGE);
};
/* Receive incorrect server_verify_data */
{
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_OK(s2n_server_renegotiation_info_extension_write(&extension,
client_verify_data, client_verify_data, verify_data_len));
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.recv(conn, &extension),
S2N_ERR_BAD_MESSAGE);
};
/* Receive initial handshake extension */
{
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
conn->handshake.renegotiation = false;
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.send(conn, &extension));
conn->handshake.renegotiation = true;
EXPECT_FAILURE_WITH_ERRNO(s2n_server_renegotiation_info_extension.recv(conn, &extension),
S2N_ERR_BAD_MESSAGE);
};
};
/* Test send during renegotiation handshake
*
*= https://tools.ietf.org/rfc/rfc5746#3.7
*= type=test
*# o The server MUST include a "renegotiation_info" extension
*# containing the saved client_verify_data and server_verify_data in
*# the ServerHello.
*/
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
client_conn->handshake.renegotiation = true;
client_conn->secure_renegotiation = true;
EXPECT_MEMCPY_SUCCESS(client_conn->handshake.client_finished,
client_verify_data, sizeof(client_verify_data));
EXPECT_MEMCPY_SUCCESS(client_conn->handshake.server_finished,
server_verify_data, sizeof(server_verify_data));
client_conn->handshake.finished_len = verify_data_len;
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
server_conn->handshake.renegotiation = true;
server_conn->secure_renegotiation = true;
EXPECT_MEMCPY_SUCCESS(server_conn->handshake.client_finished,
client_verify_data, sizeof(client_verify_data));
EXPECT_MEMCPY_SUCCESS(server_conn->handshake.server_finished,
server_verify_data, sizeof(server_verify_data));
server_conn->handshake.finished_len = verify_data_len;
DEFER_CLEANUP(struct s2n_stuffer sent_extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&sent_extension, 0));
EXPECT_TRUE(s2n_server_renegotiation_info_extension.should_send(client_conn));
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.send(client_conn, &sent_extension));
/* Verify matches test method */
DEFER_CLEANUP(struct s2n_stuffer test_extension = { 0 }, s2n_stuffer_free);
EXPECT_OK(s2n_server_renegotiation_info_extension_write(&test_extension,
client_verify_data, server_verify_data, verify_data_len));
EXPECT_EQUAL(s2n_stuffer_data_available(&sent_extension), s2n_stuffer_data_available(&test_extension));
EXPECT_BYTEARRAY_EQUAL(sent_extension.blob.data, test_extension.blob.data,
s2n_stuffer_data_available(&sent_extension));
/* Verify we can recv what we send */
EXPECT_SUCCESS(s2n_server_renegotiation_info_extension.recv(server_conn, &sent_extension));
};
/* Functional Test
*
*= https://tools.ietf.org/rfc/rfc5746#3.4
*= type=test
*# o When a ServerHello is received, the client MUST check if it
*# includes the "renegotiation_info" extension:
*/
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
/* Send and receive the ClientHello */
EXPECT_SUCCESS(s2n_client_hello_send(client_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&client_conn->handshake.io, &server_conn->handshake.io,
s2n_stuffer_data_available(&client_conn->handshake.io)));
EXPECT_SUCCESS(s2n_client_hello_recv(server_conn));
/* Test "renegotiation_info" extension NOT included during initial handshake */
{
EXPECT_FALSE(client_conn->secure_renegotiation);
server_conn->secure_renegotiation = false;
EXPECT_SUCCESS(s2n_server_hello_send(server_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io,
s2n_stuffer_data_available(&server_conn->handshake.io)));
EXPECT_SUCCESS(s2n_server_hello_recv(client_conn));
EXPECT_FALSE(client_conn->secure_renegotiation);
};
/* Test "renegotiation_info" extension included during initial handshake */
{
EXPECT_FALSE(client_conn->secure_renegotiation);
server_conn->secure_renegotiation = true;
EXPECT_SUCCESS(s2n_server_hello_send(server_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io,
s2n_stuffer_data_available(&server_conn->handshake.io)));
EXPECT_SUCCESS(s2n_server_hello_recv(client_conn));
EXPECT_TRUE(client_conn->secure_renegotiation);
};
};
/* Functional Test: SSLv3
*
*= https://tools.ietf.org/rfc/rfc5746#4.5
*= type=test
*# Clients that support SSLv3 and offer secure renegotiation (either via SCSV or
*# "renegotiation_info") MUST accept the "renegotiation_info" extension
*# from the server, even if the server version is {0x03, 0x00}, and
*# behave as described in this specification. TLS servers that support
*# secure renegotiation and support SSLv3 MUST accept SCSV or the
*# "renegotiation_info" extension and respond as described in this
*# specification even if the offered client version is {0x03, 0x00}.
**/
if (s2n_hash_is_available(S2N_HASH_MD5)) {
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client_conn, "test_all"));
client_conn->client_protocol_version = S2N_SSLv3;
client_conn->actual_protocol_version = S2N_SSLv3;
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server_conn, "test_all"));
server_conn->server_protocol_version = S2N_SSLv3;
server_conn->actual_protocol_version = S2N_SSLv3;
DEFER_CLEANUP(struct s2n_test_io_pair io_pair = { 0 }, s2n_io_pair_close);
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
EXPECT_SUCCESS(s2n_connections_set_io_pair(client_conn, server_conn, &io_pair));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_TRUE(client_conn->secure_renegotiation);
EXPECT_TRUE(server_conn->secure_renegotiation);
EXPECT_EQUAL(client_conn->actual_protocol_version, S2N_SSLv3);
EXPECT_EQUAL(server_conn->actual_protocol_version, S2N_SSLv3);
}
END_TEST();
return 0;
}
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