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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 <stdlib.h>
#include "api/s2n.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_security_policies.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls13_handshake.c"
int main(int argc, char **argv)
{
BEGIN_TEST();
if (!s2n_is_tls13_fully_supported()) {
END_TEST();
}
struct s2n_cert_chain_and_key *cert_chain = NULL;
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&cert_chain,
S2N_ECDSA_P384_PKCS1_CERT_CHAIN, S2N_ECDSA_P384_PKCS1_KEY));
EXPECT_NOT_NULL(cert_chain);
struct s2n_config *config = s2n_config_new();
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, cert_chain));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "default_tls13"));
struct s2n_connection *client_conn;
/* This test ensures that if the server did not send a keyshare extension in the server hello function,
* a null pointer error is correctly thrown.
*/
{
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
client_conn->actual_protocol_version = S2N_TLS13;
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(client_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
/* Select curve and generate key for client */
client_conn->kex_params.client_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[0];
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(&client_conn->kex_params.client_ecc_evp_params));
/* Recreating conditions where negotiated curve was not set */
struct s2n_ecc_evp_params missing_params = { NULL, NULL };
client_conn->kex_params.server_ecc_evp_params = missing_params;
DEFER_CLEANUP(struct s2n_blob client_shared_secret = { 0 }, s2n_free);
/* Compute fails because server's curve and public key are missing. */
EXPECT_FAILURE_WITH_ERRNO(s2n_tls13_compute_shared_secret(client_conn, &client_shared_secret), S2N_ERR_NULL);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
};
/* This test ensures that if a server sent a keyshare extension without a public key, a null pointer
* error is correctly thrown.
*/
{
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
client_conn->actual_protocol_version = S2N_TLS13;
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(client_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
/* Select curve and generate key for client */
client_conn->kex_params.client_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[0];
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(&client_conn->kex_params.client_ecc_evp_params));
/* Set curve server sent in server hello */
client_conn->kex_params.server_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[0];
DEFER_CLEANUP(struct s2n_blob client_shared_secret = { 0 }, s2n_free);
/* Compute fails because server's public key is missing */
EXPECT_FAILURE_WITH_ERRNO(s2n_tls13_compute_shared_secret(client_conn, &client_shared_secret), S2N_ERR_NULL);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
};
/* This test ensures that if a server sent a keyshare extension with a public key and curve, a client can
* generate a shared secret from it.
*/
{
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(client_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
client_conn->actual_protocol_version = S2N_TLS13;
/* Select curve and generate key for client */
client_conn->kex_params.client_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[0];
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(&client_conn->kex_params.client_ecc_evp_params));
/* Set curve server sent in server hello */
client_conn->kex_params.server_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[0];
/* Generate public key server sent in server hello */
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(&client_conn->kex_params.server_ecc_evp_params));
DEFER_CLEANUP(struct s2n_blob client_shared_secret = { 0 }, s2n_free);
EXPECT_SUCCESS(s2n_tls13_compute_shared_secret(client_conn, &client_shared_secret));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
};
/* This test ensures that the shared secrets computed by a client and server after negotiation match */
{
client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(client_conn);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(server_conn);
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
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));
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));
DEFER_CLEANUP(struct s2n_blob client_shared_secret = { 0 }, s2n_free);
EXPECT_SUCCESS(s2n_tls13_compute_shared_secret(client_conn, &client_shared_secret));
EXPECT_TRUE(client_shared_secret.size > 0);
DEFER_CLEANUP(struct s2n_blob server_shared_secret = { 0 }, s2n_free);
EXPECT_SUCCESS(s2n_tls13_compute_shared_secret(server_conn, &server_shared_secret));
EXPECT_TRUE(server_shared_secret.size > 0);
S2N_BLOB_EXPECT_EQUAL(server_shared_secret, client_shared_secret);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(cert_chain));
EXPECT_SUCCESS(s2n_config_free(config));
END_TEST();
}
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