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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 "s2n_test.h"
#include "stuffer/s2n_stuffer.h"
#include "tls/s2n_cipher_suites.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
static int reset_stuffers(struct s2n_stuffer *reread, struct s2n_stuffer *wipe)
{
POSIX_GUARD(s2n_stuffer_reread(reread));
POSIX_GUARD(s2n_stuffer_wipe(wipe));
return 0;
}
int main(int argc, char **argv)
{
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
/* Test s2n_tls13_server_finished_send and s2n_tls13_server_finished_recv */
{
struct s2n_cipher_suite cipher_suites[] = {
s2n_tls13_aes_128_gcm_sha256,
s2n_tls13_aes_256_gcm_sha384,
s2n_tls13_chacha20_poly1305_sha256
};
uint32_t hash_sizes[] = {
32, 48, 32
};
for (int i = 0; i < 3; i++) {
struct s2n_connection *server_conn;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_CLIENT));
server_conn->actual_protocol_version = S2N_TLS13;
server_conn->secure->cipher_suite = &cipher_suites[i];
uint32_t hash_size = hash_sizes[i];
EXPECT_SUCCESS(s2n_tls13_server_finished_send(server_conn));
EXPECT_EQUAL(s2n_stuffer_data_available(&server_conn->handshake.io), hash_size);
struct s2n_connection *client_conn;
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
client_conn->actual_protocol_version = S2N_TLS13;
client_conn->secure->cipher_suite = &cipher_suites[i];
EXPECT_SUCCESS(reset_stuffers(&server_conn->handshake.io, &client_conn->handshake.io));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io, hash_size));
EXPECT_SUCCESS(s2n_tls13_server_finished_recv(client_conn));
/* Expect failure if verify has a missing byte */
EXPECT_SUCCESS(reset_stuffers(&server_conn->handshake.io, &client_conn->handshake.io));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io, hash_size - 1));
EXPECT_FAILURE(s2n_tls13_server_finished_recv(client_conn));
/* Expect failure if verify have additional byte */
EXPECT_SUCCESS(reset_stuffers(&server_conn->handshake.io, &client_conn->handshake.io));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io, hash_size));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&client_conn->handshake.io, 0));
EXPECT_FAILURE(s2n_tls13_server_finished_recv(client_conn));
/* Expect failure if verify on wire is modified by 1 bit */
EXPECT_SUCCESS(reset_stuffers(&server_conn->handshake.io, &client_conn->handshake.io));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io, hash_size));
client_conn->handshake.io.blob.data[0] ^= 1;
EXPECT_FAILURE(s2n_tls13_server_finished_recv(client_conn));
/* Expect failure if finished key differs */
EXPECT_SUCCESS(reset_stuffers(&server_conn->handshake.io, &client_conn->handshake.io));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io, hash_size));
client_conn->handshake.server_finished[0] ^= 1;
EXPECT_FAILURE(s2n_tls13_server_finished_recv(client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
}
};
/* Test that they can only run in TLS 1.3 mode */
{
struct s2n_connection *server_conn;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_CLIENT));
server_conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
EXPECT_FAILURE(s2n_tls13_server_finished_send(server_conn));
/* now with TLS 1.3, server finished send can run */
server_conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_tls13_server_finished_send(server_conn));
EXPECT_EQUAL(s2n_stuffer_data_available(&server_conn->handshake.io), 48);
struct s2n_connection *client_conn;
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
client_conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io, 48));
EXPECT_FAILURE(s2n_tls13_server_finished_recv(client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Test for failure cases if cipher suites are incompatible */
{
struct s2n_connection *server_conn;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_CLIENT));
server_conn->actual_protocol_version = S2N_TLS13;
server_conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
EXPECT_SUCCESS(s2n_tls13_server_finished_send(server_conn));
EXPECT_EQUAL(s2n_stuffer_data_available(&server_conn->handshake.io), 32);
struct s2n_connection *client_conn;
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
client_conn->actual_protocol_version = S2N_TLS13;
client_conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
EXPECT_SUCCESS(reset_stuffers(&server_conn->handshake.io, &client_conn->handshake.io));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io, 32));
EXPECT_FAILURE(s2n_tls13_server_finished_recv(client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Test for failure cases when finished secret key differs */
{
struct s2n_connection *server_conn;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_CLIENT));
server_conn->actual_protocol_version = S2N_TLS13;
server_conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
EXPECT_SUCCESS(s2n_tls13_server_finished_send(server_conn));
EXPECT_EQUAL(s2n_stuffer_data_available(&server_conn->handshake.io), 48);
struct s2n_connection *client_conn;
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
client_conn->actual_protocol_version = S2N_TLS13;
client_conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
for (int i = 0; i < 48; i++) {
EXPECT_SUCCESS(reset_stuffers(&server_conn->handshake.io, &client_conn->handshake.io));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io, 48));
/* flip a bit to test failure */
client_conn->handshake.server_finished[i] ^= 1;
EXPECT_FAILURE(s2n_tls13_server_finished_recv(client_conn));
/* flip the bit back */
client_conn->handshake.server_finished[i] ^= 1;
}
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
END_TEST();
return 0;
}
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