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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 "testlib/s2n_testlib.h"
#include "tls/s2n_client_hello.c"
/* The server will always prefer to negotiate an application protocol with
* the ALPN extension. This callback wipes the ALPN extension from the client
* hello and forces the server to negotiate a protocol using the NPN extension
* instead. */
static int s2n_wipe_alpn_ext(struct s2n_connection *conn, void *ctx)
{
struct s2n_client_hello *client_hello = s2n_connection_get_client_hello(conn);
POSIX_ENSURE_REF(client_hello);
s2n_parsed_extension *parsed_extension = NULL;
POSIX_GUARD(s2n_client_hello_get_parsed_extension(S2N_EXTENSION_ALPN, &client_hello->extensions, &parsed_extension));
POSIX_ENSURE_REF(parsed_extension);
POSIX_GUARD(s2n_blob_zero(&parsed_extension->extension));
return S2N_SUCCESS;
}
int main(int argc, char **argv)
{
BEGIN_TEST();
const char *protocols[] = { "http/1.1", "spdy/1", "spdy/2" };
const uint8_t protocols_count = s2n_array_len(protocols);
/* Set up connections */
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);
/* Set up config */
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_set_cipher_preferences(config, "default"));
struct s2n_cert_chain_and_key *chain_and_key = NULL;
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));
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
config->npn_supported = true;
/* Set up config that wipes ALPN extension */
DEFER_CLEANUP(struct s2n_config *npn_config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(npn_config);
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(npn_config));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(npn_config, "default"));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(npn_config, chain_and_key));
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(npn_config, protocols, protocols_count));
EXPECT_SUCCESS(s2n_config_set_client_hello_cb(npn_config, s2n_wipe_alpn_ext, NULL));
npn_config->npn_supported = true;
EXPECT_SUCCESS(s2n_connection_set_blinding(client_conn, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_blinding(server_conn, S2N_SELF_SERVICE_BLINDING));
/* Client and server both support NPN. ALPN is negotiated since it is also
* supported and the server prefers ALPN. */
{
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
/* Create nonblocking pipes */
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_connection_set_io_pair(server_conn, &io_pair));
EXPECT_SUCCESS(s2n_connection_set_io_pair(client_conn, &io_pair));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
/* Server prefers ALPN over NPN */
EXPECT_FALSE(IS_NPN_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_NPN_HANDSHAKE(client_conn));
/* ALPN has negotiated a protocol */
EXPECT_NOT_NULL(s2n_get_application_protocol(client_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(client_conn), protocols[0], strlen(protocols[0]));
EXPECT_NOT_NULL(s2n_get_application_protocol(server_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(server_conn), protocols[0], strlen(protocols[0]));
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_wipe(client_conn));
EXPECT_SUCCESS(s2n_connection_wipe(server_conn));
};
/* Client and server both support NPN. Wipe ALPN with the Client Hello callback so only NPN is received.
* NPN is negotiated and not ALPN. */
{
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, npn_config));
/* Create nonblocking pipes */
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_connection_set_io_pair(server_conn, &io_pair));
EXPECT_SUCCESS(s2n_connection_set_io_pair(client_conn, &io_pair));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_TRUE(IS_NPN_HANDSHAKE(server_conn));
EXPECT_TRUE(IS_NPN_HANDSHAKE(client_conn));
/* NPN has negotiated a protocol */
EXPECT_NOT_NULL(s2n_get_application_protocol(client_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(client_conn), protocols[0], strlen(protocols[0]));
EXPECT_NOT_NULL(s2n_get_application_protocol(server_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(server_conn), protocols[0], strlen(protocols[0]));
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_wipe(client_conn));
EXPECT_SUCCESS(s2n_connection_wipe(server_conn));
};
/* Client and server both support NPN, however, they have no protocols in common.
* Connection negotiates client's top protocol. */
{
/* Config with different protocols */
const char *server_protocols[] = { "h2", "h3" };
const uint8_t server_protocols_count = s2n_array_len(server_protocols);
DEFER_CLEANUP(struct s2n_config *different_config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(different_config);
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(different_config));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(different_config, "default"));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(different_config, chain_and_key));
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(different_config, server_protocols, server_protocols_count));
EXPECT_SUCCESS(s2n_config_set_client_hello_cb(different_config, s2n_wipe_alpn_ext, NULL));
different_config->npn_supported = true;
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, different_config));
/* Create nonblocking pipes */
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_connection_set_io_pair(server_conn, &io_pair));
EXPECT_SUCCESS(s2n_connection_set_io_pair(client_conn, &io_pair));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_TRUE(IS_NPN_HANDSHAKE(server_conn));
EXPECT_TRUE(IS_NPN_HANDSHAKE(client_conn));
/* Client-preference protocol is chosen since server and client have no mutually supported protocols. */
EXPECT_NOT_NULL(s2n_get_application_protocol(client_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(client_conn), protocols[0], strlen(protocols[0]));
EXPECT_NOT_NULL(s2n_get_application_protocol(server_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(server_conn), protocols[0], strlen(protocols[0]));
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_wipe(client_conn));
EXPECT_SUCCESS(s2n_connection_wipe(server_conn));
};
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(chain_and_key));
END_TEST();
}
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