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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 "crypto/s2n_rsa_signing.h"
#include "error/s2n_errno.h"
#include "s2n_test.h"
#include "stuffer/s2n_stuffer.h"
#include "testlib/s2n_testlib.h"
#include "tls/extensions/s2n_extension_type.h"
#include "tls/extensions/s2n_server_alpn.h"
#include "tls/extensions/s2n_server_max_fragment_length.h"
#include "tls/extensions/s2n_server_server_name.h"
#include "tls/extensions/s2n_server_supported_versions.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls13.h"
#include "utils/s2n_safety.h"
int main(int argc, char **argv)
{
BEGIN_TEST();
EXPECT_SUCCESS(s2n_enable_tls13_in_test());
/* Test s2n_encrypted_extensions_send */
{
/* Safety checks */
EXPECT_FAILURE(s2n_encrypted_extensions_send(NULL));
/* Should fail for pre-TLS1.3 */
{
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_allow_all_response_extensions(conn));
/* Fails for TLS1.2 */
conn->actual_protocol_version = S2N_TLS12;
EXPECT_FAILURE_WITH_ERRNO(s2n_encrypted_extensions_send(conn), S2N_ERR_BAD_MESSAGE);
/* Succeeds for TLS1.3 */
conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_encrypted_extensions_send(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Should send no extensions by default */
{
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_allow_all_response_extensions(conn));
conn->actual_protocol_version = S2N_TLS13;
struct s2n_stuffer *stuffer = &conn->handshake.io;
EXPECT_SUCCESS(s2n_encrypted_extensions_send(conn));
uint16_t extension_list_size;
EXPECT_SUCCESS(s2n_stuffer_read_uint16(stuffer, &extension_list_size));
EXPECT_EQUAL(extension_list_size, 0);
EXPECT_EQUAL(s2n_stuffer_data_available(stuffer), 0);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Should send a requested extension */
{
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_allow_all_response_extensions(conn));
conn->actual_protocol_version = S2N_TLS13;
struct s2n_stuffer *stuffer = &conn->handshake.io;
conn->server_name_used = 1;
EXPECT_SUCCESS(s2n_encrypted_extensions_send(conn));
uint16_t extension_list_size;
EXPECT_SUCCESS(s2n_stuffer_read_uint16(stuffer, &extension_list_size));
EXPECT_NOT_EQUAL(extension_list_size, 0);
EXPECT_EQUAL(s2n_stuffer_data_available(stuffer), extension_list_size);
uint16_t extension_type;
EXPECT_SUCCESS(s2n_stuffer_read_uint16(stuffer, &extension_type));
EXPECT_EQUAL(extension_type, s2n_server_server_name_extension.iana_value);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
/* Test s2n_encrypted_extensions_recv */
{
/* Safety checks */
EXPECT_FAILURE(s2n_encrypted_extensions_recv(NULL));
/* Should fail for pre-TLS1.3 */
{
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_allow_all_response_extensions(conn));
/* Fails for TLS1.2 */
conn->actual_protocol_version = S2N_TLS12;
EXPECT_FAILURE_WITH_ERRNO(s2n_encrypted_extensions_recv(conn), S2N_ERR_BAD_MESSAGE);
/* Succeeds for TLS1.3 */
conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Should parse an empty list */
{
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_allow_all_response_extensions(conn));
conn->actual_protocol_version = S2N_TLS13;
struct s2n_stuffer *stuffer = &conn->handshake.io;
/* Parse no data */
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(conn));
EXPECT_EQUAL(s2n_stuffer_data_available(stuffer), 0);
/* Parse explicitly empty list */
EXPECT_SUCCESS(s2n_extension_list_send(S2N_EXTENSION_LIST_EMPTY, conn, stuffer));
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(conn));
EXPECT_EQUAL(s2n_stuffer_data_available(stuffer), 0);
/* Parse empty result of default s2n_encrypted_extensions_send */
EXPECT_SUCCESS(s2n_encrypted_extensions_send(conn));
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(conn));
EXPECT_EQUAL(s2n_stuffer_data_available(stuffer), 0);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Should parse a requested extension */
{
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_allow_all_response_extensions(conn));
conn->actual_protocol_version = S2N_TLS13;
struct s2n_stuffer *stuffer = &conn->handshake.io;
conn->server_name_used = 1;
EXPECT_SUCCESS(s2n_encrypted_extensions_send(conn));
/* Reset server_name_used */
conn->server_name_used = 0;
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(conn));
EXPECT_EQUAL(s2n_stuffer_data_available(stuffer), 0);
EXPECT_EQUAL(conn->server_name_used, 1);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
/* Functional: Unencrypted EncryptedExtensions rejected */
if (s2n_is_tls13_fully_supported()) {
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
struct s2n_cert_chain_and_key *chain_and_key;
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key,
S2N_DEFAULT_ECDSA_TEST_CERT_CHAIN, S2N_DEFAULT_ECDSA_TEST_PRIVATE_KEY));
struct s2n_config *config;
EXPECT_NOT_NULL(config = s2n_config_new());
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "default_tls13"));
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(config));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(client_conn);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(client_conn, S2N_SELF_SERVICE_BLINDING));
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_connection_set_blinding(server_conn, S2N_SELF_SERVICE_BLINDING));
/* Create IO stuffers */
DEFER_CLEANUP(struct s2n_stuffer client_to_server = { 0 }, s2n_stuffer_free);
DEFER_CLEANUP(struct s2n_stuffer server_to_client = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&client_to_server, 0));
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&server_to_client, 0));
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(&server_to_client, &client_to_server, client_conn));
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(&client_to_server, &server_to_client, server_conn));
/* Do handshake up until EncryptedExtensions */
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn, ENCRYPTED_EXTENSIONS));
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), ENCRYPTED_EXTENSIONS);
/* Verify that the EncryptedExtension message would normally be encrypted */
EXPECT_EQUAL(server_conn->server, server_conn->secure);
/* Force the server to disable encryption for the EncryptedExtensions message */
server_conn->server = server_conn->initial;
/* Enable an extension to ensure the message is long enough to resemble an encrypted record.
* If the message is too short, we fail without even attempting decryption and this error
* is difficult to distinguish from other S2N_ERR_BAD_MESSAGE cases.
*/
uint8_t long_alpn[] = "httttttttttttttttttttps";
EXPECT_SUCCESS(s2n_connection_allow_all_response_extensions(server_conn));
EXPECT_MEMCPY_SUCCESS(server_conn->application_protocol, long_alpn, sizeof(long_alpn));
/* Reset the stuffer, potentially wiping any pending CCS messages.
* We don't need the complication of accidentally rereading old messages.
*/
EXPECT_SUCCESS(s2n_stuffer_wipe(&server_to_client));
/* Write unencrypted EncryptedExtensions message */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), ENCRYPTED_EXTENSIONS);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_IO_BLOCKED);
EXPECT_NOT_EQUAL(s2n_conn_get_current_message_type(server_conn), ENCRYPTED_EXTENSIONS);
/* Verify message is unencrypted handshake message instead of
* encrypted APPLICATION_DATA message.
*/
uint8_t type = 0;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&server_to_client, &type));
EXPECT_EQUAL(type, TLS_HANDSHAKE); /* Record type not APPLICATION_DATA */
EXPECT_SUCCESS(s2n_stuffer_reread(&server_to_client));
EXPECT_SUCCESS(s2n_stuffer_skip_read(&server_to_client, S2N_TLS_RECORD_HEADER_LENGTH));
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&server_to_client, &type));
EXPECT_EQUAL(type, TLS_ENCRYPTED_EXTENSIONS); /* Actual handshake type not encrypted */
EXPECT_SUCCESS(s2n_stuffer_reread(&server_to_client));
/* Client fails to parse the EncryptedExtensions */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), ENCRYPTED_EXTENSIONS);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(client_conn, &blocked), S2N_ERR_DECRYPT);
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), ENCRYPTED_EXTENSIONS);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(chain_and_key));
EXPECT_SUCCESS(s2n_config_free(config));
}
END_TEST();
}
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