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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 <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdint.h>
#include <sys/wait.h>
#include <unistd.h>
#include "api/s2n.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_handshake.h"
#include "utils/s2n_random.h"
#define MAX_BUF_SIZE 10000
int mock_client(struct s2n_test_io_pair *io_pair)
{
struct s2n_connection *conn = NULL;
struct s2n_config *client_config = NULL;
s2n_blocked_status blocked;
int result = 0;
conn = s2n_connection_new(S2N_CLIENT);
client_config = s2n_config_new();
s2n_config_disable_x509_verification(client_config);
s2n_connection_set_config(conn, client_config);
/* Unlike the server, the client just passes ownership of I/O to s2n */
s2n_connection_set_io_pair(conn, io_pair);
result = s2n_negotiate(conn, &blocked);
if (result < 0) {
exit(1);
}
s2n_shutdown(conn, &blocked);
s2n_connection_free(conn);
s2n_config_free(client_config);
s2n_cleanup();
s2n_io_pair_close_one_end(io_pair, S2N_CLIENT);
exit(0);
}
int main(int argc, char **argv)
{
BEGIN_TEST();
/**
* This test creates a server, client, and a pair of pipes. The client uses the
* pipes directly for I/O in s2n. The server copies data from the pipes into
* stuffers and manages s2n I/O with a set of I/O callbacks that read and write
* from the stuffers.
*/
{
s2n_blocked_status blocked;
int status = 0;
pid_t pid = 0;
char *cert_chain_pem = NULL;
char *private_key_pem = NULL;
char *dhparams_pem = NULL;
/* For convenience, this test will intentionally try to write to closed pipes during shutdown. Ignore the signal to
* avoid exiting the process on SIGPIPE.
*/
signal(SIGPIPE, SIG_IGN);
/* Create a pipe */
struct s2n_test_io_pair io_pair;
EXPECT_SUCCESS(s2n_io_pair_init(&io_pair));
/* Create a child process */
pid = fork();
if (pid == 0) {
/* This is the client process, close the server end of the pipe */
EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_SERVER));
/* Run the client */
mock_client(&io_pair);
}
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(),
s2n_config_ptr_free);
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
DEFER_CLEANUP(struct s2n_cert_chain_and_key *chain_and_key = s2n_cert_chain_and_key_new(),
s2n_cert_chain_and_key_ptr_free);
DEFER_CLEANUP(struct s2n_stuffer in, s2n_stuffer_free);
DEFER_CLEANUP(struct s2n_stuffer out, s2n_stuffer_free);
EXPECT_NOT_NULL(cert_chain_pem = malloc(S2N_MAX_TEST_PEM_SIZE));
EXPECT_NOT_NULL(private_key_pem = malloc(S2N_MAX_TEST_PEM_SIZE));
EXPECT_NOT_NULL(dhparams_pem = malloc(S2N_MAX_TEST_PEM_SIZE));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_DEFAULT_TEST_CERT_CHAIN, cert_chain_pem, S2N_MAX_TEST_PEM_SIZE));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_DEFAULT_TEST_PRIVATE_KEY, private_key_pem, S2N_MAX_TEST_PEM_SIZE));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_DEFAULT_TEST_DHPARAMS, dhparams_pem, S2N_MAX_TEST_PEM_SIZE));
EXPECT_SUCCESS(s2n_cert_chain_and_key_load_pem(chain_and_key, cert_chain_pem, private_key_pem));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
EXPECT_SUCCESS(s2n_config_add_dhparams(config, dhparams_pem));
/* This is the server process, close the client end of the pipe */
EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
EXPECT_FAILURE(s2n_connection_use_corked_io(conn));
/* Set up our I/O callbacks. Use stuffers for the "I/O context" */
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&in, 0));
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(&in, &out, conn));
/* Make our pipes non-blocking */
EXPECT_SUCCESS(s2n_fd_set_non_blocking(io_pair.server));
EXPECT_SUCCESS(s2n_fd_set_non_blocking(io_pair.server));
/* Negotiate the handshake. */
do {
int ret = 0;
ret = s2n_negotiate(conn, &blocked);
EXPECT_TRUE(ret == 0 || (blocked && (errno == EAGAIN || errno == EWOULDBLOCK)));
/* check to see if we need to copy more over from the pipes to the buffers
* to continue the handshake
*/
s2n_stuffer_recv_from_fd(&in, io_pair.server, MAX_BUF_SIZE, NULL);
s2n_stuffer_send_to_fd(&out, io_pair.server, s2n_stuffer_data_available(&out), NULL);
} while (blocked);
/* Shutdown after negotiating */
uint8_t server_shutdown = 0;
do {
int ret = 0;
ret = s2n_shutdown(conn, &blocked);
EXPECT_TRUE(ret == 0 || (blocked && (errno == EAGAIN || errno == EWOULDBLOCK)));
if (ret == 0) {
server_shutdown = 1;
}
s2n_stuffer_recv_from_fd(&in, io_pair.server, MAX_BUF_SIZE, NULL);
s2n_stuffer_send_to_fd(&out, io_pair.server, s2n_stuffer_data_available(&out), NULL);
} while (!server_shutdown);
/* Clean up */
EXPECT_EQUAL(waitpid(-1, &status, 0), pid);
EXPECT_EQUAL(status, 0);
EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_SERVER));
free(cert_chain_pem);
free(private_key_pem);
free(dhparams_pem);
};
/* Clients and servers can utilize both custom IO and default IO for their sending and receiving */
{
/* Setup connections */
struct s2n_connection *client_conn = NULL;
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
/* Setup config */
struct s2n_config *config_with_certs = NULL;
EXPECT_NOT_NULL(config_with_certs = s2n_config_new());
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config_with_certs, "default_tls13"));
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(config_with_certs));
struct s2n_cert_chain_and_key *chain_and_key = NULL;
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key, S2N_DEFAULT_ECDSA_TEST_CERT_CHAIN,
S2N_DEFAULT_ECDSA_TEST_PRIVATE_KEY));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config_with_certs, chain_and_key));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config_with_certs));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config_with_certs));
/* Create nonblocking pipes */
struct s2n_test_io_pair io_pair = { 0 };
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
/* Server writes to fd and client reads from fd */
EXPECT_SUCCESS(s2n_connection_set_write_fd(server_conn, io_pair.server));
EXPECT_SUCCESS(s2n_connection_set_read_fd(client_conn, io_pair.client));
DEFER_CLEANUP(struct s2n_stuffer stuffer = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, S2N_DEFAULT_RECORD_LENGTH));
/* Client writes to stuffer and server reads from stuffer */
EXPECT_SUCCESS(s2n_connection_set_send_io_stuffer(&stuffer, client_conn));
EXPECT_SUCCESS(s2n_connection_set_recv_io_stuffer(&stuffer, server_conn));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
/* Clean-up */
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_config_free(config_with_certs));
EXPECT_SUCCESS(s2n_io_pair_close(&io_pair));
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(chain_and_key));
};
END_TEST();
}
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