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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 "api/s2n.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "utils/s2n_result.h"
/* Get access to s2n_handshake_read_io */
#include "tls/s2n_handshake_io.c"
bool async_blocked = false;
size_t blocking_handler_count = 0;
static int s2n_blocking_handler(struct s2n_connection *conn)
{
blocking_handler_count++;
if (async_blocked) {
POSIX_BAIL(S2N_ERR_ASYNC_BLOCKED);
}
return S2N_SUCCESS;
}
static int s2n_error_handler(struct s2n_connection *conn)
{
POSIX_BAIL(S2N_ERR_UNIMPLEMENTED);
}
int main(int argc, char **argv)
{
BEGIN_TEST();
/* Async blocking errors block handshake negotiation */
{
const size_t repeat_count = 10;
DEFER_CLEANUP(struct s2n_stuffer io_buffer = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&io_buffer, 0));
/* Write handles async blocking */
{
tls13_state_machine[CLIENT_HELLO].handler[S2N_CLIENT] = s2n_blocking_handler;
tls13_state_machine[SERVER_HELLO].handler[S2N_CLIENT] = s2n_error_handler;
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(NULL, &io_buffer, conn));
EXPECT_OK(s2n_conn_choose_state_machine(conn, S2N_TLS13));
/* Consistently blocks */
async_blocked = true;
blocking_handler_count = 0;
for (size_t i = 0; i < repeat_count; i++) {
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(conn, &blocked), S2N_ERR_ASYNC_BLOCKED);
EXPECT_EQUAL(blocked, S2N_BLOCKED_ON_APPLICATION_INPUT);
EXPECT_EQUAL(s2n_stuffer_data_available(&io_buffer), 0);
}
EXPECT_EQUAL(blocking_handler_count, repeat_count);
/* If unblocked, continues. Fails to read next message because there is no next message. */
async_blocked = false;
blocking_handler_count = 0;
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(conn, &blocked), S2N_ERR_IO);
EXPECT_EQUAL(blocking_handler_count, 1);
/* Only wrote one record/message */
EXPECT_EQUAL(s2n_stuffer_data_available(&io_buffer), S2N_TLS_RECORD_HEADER_LENGTH + TLS_HANDSHAKE_HEADER_LENGTH);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Use the output of writing to test reading */
EXPECT_SUCCESS(s2n_stuffer_reread(&io_buffer));
/* Read handles async blocking */
{
state_machine[CLIENT_HELLO].handler[S2N_SERVER] = s2n_blocking_handler;
state_machine[SERVER_HELLO].handler[S2N_SERVER] = s2n_error_handler;
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_SUCCESS(s2n_connection_set_blinding(conn, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(&io_buffer, NULL, conn));
/* Consistently blocks */
async_blocked = true;
blocking_handler_count = 0;
for (size_t i = 0; i < repeat_count; i++) {
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(conn, &blocked), S2N_ERR_ASYNC_BLOCKED);
EXPECT_EQUAL(blocked, S2N_BLOCKED_ON_APPLICATION_INPUT);
EXPECT_EQUAL(s2n_stuffer_data_available(&io_buffer), 0);
}
EXPECT_EQUAL(blocking_handler_count, repeat_count);
/* If unblocked, continues */
async_blocked = false;
blocking_handler_count = 0;
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(conn, &blocked), S2N_ERR_UNIMPLEMENTED);
EXPECT_EQUAL(blocking_handler_count, 1);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
END_TEST();
}
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