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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 <stdint.h>
#include "s2n_test.h"
#include "stuffer/s2n_stuffer.h"
#include "testlib/s2n_testlib.h"
#include "tls/extensions/s2n_client_signature_algorithms.h"
#include "tls/s2n_config.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
int main(int argc, char **argv)
{
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
struct s2n_config *config;
EXPECT_NOT_NULL(config = s2n_config_new());
struct s2n_cert_chain_and_key *chain_and_key;
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key,
S2N_DEFAULT_TEST_CERT_CHAIN, S2N_DEFAULT_TEST_PRIVATE_KEY));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
/* Test should_send */
{
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
conn->actual_protocol_version = S2N_TLS10;
EXPECT_FALSE(s2n_client_signature_algorithms_extension.should_send(conn));
conn->actual_protocol_version = S2N_TLS12;
EXPECT_TRUE(s2n_client_signature_algorithms_extension.should_send(conn));
conn->actual_protocol_version = S2N_TLS13;
EXPECT_TRUE(s2n_client_signature_algorithms_extension.should_send(conn));
s2n_connection_free(conn);
};
/* Test that recv can parse send */
{
struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
struct s2n_stuffer io;
s2n_stuffer_growable_alloc(&io, 0);
EXPECT_SUCCESS(s2n_client_signature_algorithms_extension.send(client_conn, &io));
EXPECT_SUCCESS(s2n_client_signature_algorithms_extension.recv(server_conn, &io));
EXPECT_EQUAL(s2n_stuffer_data_available(&io), 0);
EXPECT_EQUAL(server_conn->handshake_params.client_sig_hash_algs.len,
s2n_supported_sig_schemes_count(client_conn));
s2n_stuffer_free(&io);
s2n_connection_free(client_conn);
s2n_connection_free(server_conn);
};
/* Test that unknown TLS_EXTENSION_SIGNATURE_ALGORITHMS values are ignored and negotiation fails */
{
struct s2n_sig_scheme_list sig_hash_algs = {
.iana_list = { 0xFF01, 0xFFFF },
.len = 2,
};
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
struct s2n_stuffer signature_algorithms_extension;
EXPECT_SUCCESS(s2n_stuffer_alloc(&signature_algorithms_extension, 2 + (sig_hash_algs.len * 2)));
POSIX_GUARD(s2n_stuffer_write_uint16(&signature_algorithms_extension, sig_hash_algs.len * 2));
for (int i = 0; i < sig_hash_algs.len; i++) {
POSIX_GUARD(s2n_stuffer_write_uint16(&signature_algorithms_extension, sig_hash_algs.iana_list[i]));
}
/* If only unknown algorithms are offered, expect choosing a scheme to fail for TLS1.3 */
conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_client_signature_algorithms_extension.recv(conn, &signature_algorithms_extension));
EXPECT_EQUAL(conn->handshake_params.client_sig_hash_algs.len, sig_hash_algs.len);
EXPECT_FAILURE(s2n_choose_sig_scheme_from_peer_preference_list(conn, &conn->handshake_params.client_sig_hash_algs,
&conn->handshake_params.conn_sig_scheme));
EXPECT_SUCCESS(s2n_stuffer_free(&signature_algorithms_extension));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Test that a valid algorithm is chosen when it is offered among unknown algorithms */
{
struct s2n_sig_scheme_list sig_hash_algs = {
.iana_list = { 0xFF01, 0xFFFF, TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA384 },
.len = 3,
};
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
POSIX_GUARD(s2n_connection_set_config(conn, config));
conn->actual_protocol_version = S2N_TLS12;
struct s2n_stuffer signature_algorithms_extension;
EXPECT_SUCCESS(s2n_stuffer_alloc(&signature_algorithms_extension, 2 + (sig_hash_algs.len * 2)));
EXPECT_SUCCESS(s2n_stuffer_write_uint16(&signature_algorithms_extension, sig_hash_algs.len * 2));
for (int i = 0; i < sig_hash_algs.len; i++) {
EXPECT_SUCCESS(s2n_stuffer_write_uint16(&signature_algorithms_extension, sig_hash_algs.iana_list[i]));
}
/* If a valid algorithm is offered among unknown algorithms, the valid one should be chosen */
EXPECT_SUCCESS(s2n_client_signature_algorithms_extension.recv(conn, &signature_algorithms_extension));
EXPECT_EQUAL(conn->handshake_params.client_sig_hash_algs.len, sig_hash_algs.len);
EXPECT_SUCCESS(s2n_choose_sig_scheme_from_peer_preference_list(conn, &conn->handshake_params.client_sig_hash_algs,
&conn->handshake_params.conn_sig_scheme));
EXPECT_EQUAL(conn->handshake_params.conn_sig_scheme.iana_value, TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA384);
EXPECT_SUCCESS(s2n_stuffer_free(&signature_algorithms_extension));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
EXPECT_SUCCESS(s2n_config_free(config));
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(chain_and_key));
END_TEST();
return 0;
}
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