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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 <unistd.h>
#include "api/s2n.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#define ZERO_TO_THIRTY_ONE 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, \
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F
#define INTERNAL_ERROR_ALERT_HEX 0x50
/* This test simulates a client sends a TLS alert record and closes its socket immediately after the ClientHello.
* We want to validate that s2n informs the caller of the alert instead of an I/O error. Both errors result
* in a failed handshake, but the alert is generally more useful.
*/
int main(int argc, char **argv)
{
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
uint8_t client_hello_message[] = {
/* Protocol version TLS 1.2 */
0x03, 0x03,
/* Client random */
ZERO_TO_THIRTY_ONE,
/* SessionID len - 32 bytes */
0x20,
/* Session ID */
ZERO_TO_THIRTY_ONE,
/* Cipher suites len */
0x00, 0x02,
/* Cipher suite - TLS_RSA_WITH_AES_128_CBC_SHA256 */
0x00, 0x3C,
/* Compression methods len */
0x01,
/* Compression method - none */
0x00,
/* Extensions len */
0x00, 0x00
};
size_t body_len = sizeof(client_hello_message);
uint8_t message_header[] = {
/* Handshake message type CLIENT HELLO */
0x01,
/* Body len */
(body_len >> 16) & 0xff,
(body_len >> 8) & 0xff,
(body_len & 0xff),
};
size_t message_len = sizeof(message_header) + body_len;
uint8_t record_header[] = {
/* Record type HANDSHAKE */
0x16,
/* Protocol version TLS 1.2 */
0x03,
0x03,
/* Message len */
(message_len >> 8) & 0xff,
(message_len & 0xff),
};
uint8_t alert_record[] = {
/* Record type ALERT */
0x15,
/* Protocol version TLS 1.2 */
0x03,
0x03,
/* Length */
0x00,
0x02,
/* Fatal alert "internal_error" */
0x02,
INTERNAL_ERROR_ALERT_HEX,
};
struct s2n_connection *server_conn = NULL;
struct s2n_config *server_config = NULL;
s2n_blocked_status server_blocked;
char *cert_chain = malloc(S2N_MAX_TEST_PEM_SIZE);
char *private_key = malloc(S2N_MAX_TEST_PEM_SIZE);
struct s2n_cert_chain_and_key *chain_and_key = NULL;
struct s2n_test_io_pair io_pair;
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_set_io_pair(server_conn, &io_pair));
EXPECT_NOT_NULL(server_config = s2n_config_new());
/* Security policy must allow cipher suite hard coded into client hello */
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(server_config, "test_all"));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_DEFAULT_TEST_CERT_CHAIN, cert_chain, S2N_MAX_TEST_PEM_SIZE));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_DEFAULT_TEST_PRIVATE_KEY, private_key, S2N_MAX_TEST_PEM_SIZE));
EXPECT_NOT_NULL(chain_and_key = s2n_cert_chain_and_key_new());
EXPECT_SUCCESS(s2n_cert_chain_and_key_load_pem(chain_and_key, cert_chain, private_key));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(server_config, chain_and_key));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, server_config));
/* Send the client hello */
EXPECT_EQUAL(write(io_pair.client, record_header, sizeof(record_header)), sizeof(record_header));
EXPECT_EQUAL(write(io_pair.client, message_header, sizeof(message_header)), sizeof(message_header));
EXPECT_EQUAL(write(io_pair.client, client_hello_message, sizeof(client_hello_message)), sizeof(client_hello_message));
/* Send an alert from client to server */
EXPECT_EQUAL(write(io_pair.client, alert_record, sizeof(alert_record)), sizeof(alert_record));
/* Close the client read/write end */
EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_CLIENT));
/* Expect the server to fail due to an incoming alert. We should not fail due to an I/O error(EPIPE). */
s2n_negotiate(server_conn, &server_blocked);
EXPECT_EQUAL(s2n_error_get_type(s2n_errno), S2N_ERR_T_ALERT);
EXPECT_EQUAL(s2n_connection_get_alert(server_conn), INTERNAL_ERROR_ALERT_HEX);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(chain_and_key));
EXPECT_SUCCESS(s2n_config_free(server_config));
free(cert_chain);
free(private_key);
EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_SERVER));
END_TEST();
}
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