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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
static const uint8_t buf_to_send[1023] = { 27 };
int mock_client(struct s2n_test_io_pair *io_pair)
{
struct s2n_connection *conn;
struct s2n_config *client_config;
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);
}
if (s2n_send(conn, buf_to_send, sizeof(buf_to_send), &blocked) != sizeof(buf_to_send)) {
_exit(2);
}
s2n_shutdown(conn, &blocked);
s2n_connection_free(conn);
s2n_config_free(client_config);
s2n_cleanup();
exit(0);
}
/**
* This test ensures that we don't allow releasing connection buffers if they contain part
* of the unprocessed record, avoiding connection corruption.
*/
int main(int argc, char **argv)
{
s2n_blocked_status blocked;
int status;
pid_t pid;
char *cert_chain_pem;
char *private_key_pem;
uint8_t buf[sizeof(buf_to_send)];
uint32_t n = 0;
ssize_t ret = 0;
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
/* 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_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_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));
/* 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));
/* Make pipes non-blocking */
EXPECT_SUCCESS(s2n_fd_set_non_blocking(io_pair.server));
EXPECT_SUCCESS(s2n_fd_set_non_blocking(io_pair.server));
/* 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));
/* Negotiate the handshake. */
do {
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);
/* Receive only 100 bytes of the record and try to call s2n_recv */
while (n < 100) {
ret = s2n_stuffer_recv_from_fd(&in, io_pair.server, 100 - n, &n);
if (errno == EAGAIN || errno == EWOULDBLOCK) {
continue;
} else {
POSIX_GUARD(ret);
}
}
/* s2n_recv should fail as we received only part of the record */
EXPECT_FAILURE(s2n_recv(conn, buf, sizeof(buf), &blocked));
EXPECT_TRUE(blocked == S2N_BLOCKED_ON_READ);
/* Now try to release the buffers and expect failure as buffers are not empty */
EXPECT_FAILURE(s2n_connection_release_buffers(conn));
/* Read the rest of the buffer and expect s2n_recv to succeed */
do {
ret = s2n_stuffer_recv_from_fd(&in, io_pair.server, MAX_BUF_SIZE, NULL);
if (errno == EAGAIN || errno == EWOULDBLOCK) {
continue;
} else {
POSIX_GUARD(ret);
}
ret = s2n_recv(conn, buf, sizeof(buf), &blocked);
} while (ret < 0 && s2n_error_get_type(s2n_errno) == S2N_ERR_T_BLOCKED
&& blocked == S2N_BLOCKED_ON_READ);
/* Expect that we read the data client sent us */
EXPECT_TRUE(ret == sizeof(buf_to_send));
EXPECT_TRUE(memcmp(buf, buf_to_send, ret) == 0);
/* Since full record was processed, we should be able to release buffers */
EXPECT_SUCCESS(s2n_connection_release_buffers(conn));
/* Shutdown after negotiating */
uint8_t server_shutdown = 0;
do {
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);
EXPECT_EQUAL(waitpid(-1, &status, 0), pid);
EXPECT_EQUAL(status, 0);
/* Clean up */
free(cert_chain_pem);
free(private_key_pem);
s2n_cleanup();
END_TEST();
return 0;
}
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