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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 "tls/s2n_connection.h"
#include "tls/s2n_handshake.h"
#include "tls/s2n_tls13.h"
#include "utils/s2n_safety.h"
#define S2N_FRAG_LEN_SMALLER_THAN_CH 150
#define TIMES_TO_BLOCK 3
/* Handling blocked IO is important to fragmentation.
* Even if we fail to read or write one fragment, we should be able to
* retry and eventually write all fragments.
*
* Therefore, wrap our normal test IO in special logic to block
* repeatedly on every read and write call.
*/
struct s2n_io_wrapper {
uint8_t times_recv_blocked;
uint8_t times_send_blocked;
s2n_recv_fn *inner_recv;
s2n_send_fn *inner_send;
void *inner_recv_ctx;
void *inner_send_ctx;
};
struct s2n_io_wrapper_pair {
struct s2n_io_wrapper client;
struct s2n_io_wrapper server;
};
static int s2n_blocking_read(void *io_context, uint8_t *buf, uint32_t len)
{
struct s2n_io_wrapper *context = (struct s2n_io_wrapper *) io_context;
if (context->times_recv_blocked < TIMES_TO_BLOCK) {
context->times_recv_blocked++;
errno = EAGAIN;
return -1;
}
context->times_recv_blocked = 0;
return context->inner_recv(context->inner_recv_ctx, buf, len);
}
static int s2n_blocking_write(void *io_context, const uint8_t *buf, uint32_t len)
{
struct s2n_io_wrapper *context = (struct s2n_io_wrapper *) io_context;
if (context->times_send_blocked < TIMES_TO_BLOCK) {
context->times_send_blocked++;
errno = EAGAIN;
return -1;
}
context->times_send_blocked = 0;
return context->inner_send(context->inner_send_ctx, buf, len);
}
static int s2n_client_hello_test_fn(struct s2n_connection *conn, void *ctx)
{
return S2N_SUCCESS;
}
struct s2n_async_pkey_op *pkey_op = NULL;
static int async_pkey_test_fn(struct s2n_connection *conn, struct s2n_async_pkey_op *op)
{
pkey_op = op;
/* Extract pkey */
struct s2n_cert_chain_and_key *chain_and_key = s2n_connection_get_selected_cert(conn);
POSIX_ENSURE_REF(chain_and_key);
s2n_cert_private_key *pkey = s2n_cert_chain_and_key_get_private_key(chain_and_key);
POSIX_ENSURE_REF(pkey);
/* Perform, but don't apply yet. We want the handshake to block. */
EXPECT_SUCCESS(s2n_async_pkey_op_perform(pkey_op, pkey));
return S2N_SUCCESS;
}
static struct s2n_config *s2n_test_config_new(struct s2n_cert_chain_and_key *chain_and_key)
{
struct s2n_config *config = s2n_config_new();
PTR_GUARD_POSIX(s2n_config_set_cipher_preferences(config, "default_tls13"));
PTR_GUARD_POSIX(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
PTR_GUARD_POSIX(s2n_config_disable_x509_verification(config));
return config;
}
static S2N_RESULT s2n_connections_set_blocking_io_pair(struct s2n_io_wrapper_pair *io_context,
struct s2n_connection *client_conn, struct s2n_connection *server_conn, struct s2n_test_io_stuffer_pair *io_pair)
{
RESULT_GUARD(s2n_io_stuffer_pair_init(io_pair));
RESULT_GUARD(s2n_connections_set_io_stuffer_pair(client_conn, server_conn, io_pair));
io_context->client = (struct s2n_io_wrapper){
.inner_recv = client_conn->recv,
.inner_send = client_conn->send,
.inner_recv_ctx = client_conn->recv_io_context,
.inner_send_ctx = client_conn->send_io_context,
};
RESULT_GUARD_POSIX(s2n_connection_set_recv_cb(client_conn, s2n_blocking_read));
RESULT_GUARD_POSIX(s2n_connection_set_recv_ctx(client_conn, &io_context->client));
RESULT_GUARD_POSIX(s2n_connection_set_send_cb(client_conn, s2n_blocking_write));
RESULT_GUARD_POSIX(s2n_connection_set_send_ctx(client_conn, &io_context->client));
io_context->server = (struct s2n_io_wrapper){
.inner_recv = server_conn->recv,
.inner_send = server_conn->send,
.inner_recv_ctx = server_conn->recv_io_context,
.inner_send_ctx = server_conn->send_io_context,
};
RESULT_GUARD_POSIX(s2n_connection_set_recv_cb(server_conn, s2n_blocking_read));
RESULT_GUARD_POSIX(s2n_connection_set_recv_ctx(server_conn, &io_context->server));
RESULT_GUARD_POSIX(s2n_connection_set_send_cb(server_conn, s2n_blocking_write));
RESULT_GUARD_POSIX(s2n_connection_set_send_ctx(server_conn, &io_context->server));
return S2N_RESULT_OK;
}
int main(int argc, char **argv)
{
BEGIN_TEST();
const uint32_t fragment_sizes[] = {
1,
2,
TLS_HANDSHAKE_HEADER_LENGTH,
TLS_HANDSHAKE_HEADER_LENGTH + 1,
S2N_FRAG_LEN_SMALLER_THAN_CH,
S2N_DEFAULT_FRAGMENT_LENGTH,
};
DEFER_CLEANUP(struct s2n_cert_chain_and_key *chain_and_key = NULL, s2n_cert_chain_and_key_ptr_free);
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key,
S2N_ECDSA_P384_PKCS1_CERT_CHAIN, S2N_ECDSA_P384_PKCS1_KEY));
/* Test sending and receiving fragmented handshake messages */
for (size_t i = 0; i < s2n_array_len(fragment_sizes); i++) {
/* Use different fragment sizes for the client and server,
* to ensure that they handle outgoing and incoming fragment sizes separately.
*/
uint32_t server_fragment_size = fragment_sizes[i];
uint32_t client_fragment_size = fragment_sizes[i] + 1;
/* Test: basic TLS1.3 handshake with fragmented messages */
if (s2n_is_tls13_fully_supported()) {
DEFER_CLEANUP(struct s2n_config *config = s2n_test_config_new(chain_and_key),
s2n_config_ptr_free);
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(server_conn, S2N_SELF_SERVICE_BLINDING));
server_conn->max_outgoing_fragment_length = server_fragment_size;
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(client_conn, S2N_SELF_SERVICE_BLINDING));
client_conn->max_outgoing_fragment_length = client_fragment_size;
struct s2n_io_wrapper_pair io_wrapper = { 0 };
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_connections_set_blocking_io_pair(&io_wrapper, client_conn, server_conn, &io_pair));
while (s2n_negotiate_test_server_and_client(server_conn, client_conn) < S2N_SUCCESS) {
POSIX_ENSURE(s2n_errno, S2N_ERR_IO_BLOCKED);
}
/* Handshake completed */
EXPECT_TRUE(IS_NEGOTIATED(server_conn));
EXPECT_TRUE(IS_NEGOTIATED(client_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
/* TLS1.3 negotiated */
EXPECT_EQUAL(server_conn->actual_protocol_version, S2N_TLS13);
EXPECT_EQUAL(client_conn->actual_protocol_version, S2N_TLS13);
};
/* Test: basic TLS1.2 handshake with fragmented messages */
{
DEFER_CLEANUP(struct s2n_config *config = s2n_test_config_new(chain_and_key),
s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "test_all_tls12"));
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(server_conn, S2N_SELF_SERVICE_BLINDING));
server_conn->max_outgoing_fragment_length = server_fragment_size;
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(client_conn, S2N_SELF_SERVICE_BLINDING));
client_conn->max_outgoing_fragment_length = client_fragment_size;
struct s2n_io_wrapper_pair io_wrapper = { 0 };
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_connections_set_blocking_io_pair(&io_wrapper, client_conn, server_conn, &io_pair));
while (s2n_negotiate_test_server_and_client(server_conn, client_conn) < S2N_SUCCESS) {
POSIX_ENSURE(s2n_errno, S2N_ERR_IO_BLOCKED);
}
/* Handshake completed */
EXPECT_TRUE(IS_NEGOTIATED(server_conn));
EXPECT_TRUE(IS_NEGOTIATED(client_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
/* TLS1.2 negotiated */
EXPECT_EQUAL(server_conn->actual_protocol_version, S2N_TLS12);
EXPECT_EQUAL(client_conn->actual_protocol_version, S2N_TLS12);
};
/* Test: handshake with reader async callback and fragmented messages
*
* Resuming the handshake after an async callback follows a different code path.
*
* We use the client hello callback because it triggers when reading the client hello message.
*/
{
DEFER_CLEANUP(struct s2n_config *config = s2n_test_config_new(chain_and_key),
s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_client_hello_cb(config, s2n_client_hello_test_fn, NULL));
EXPECT_SUCCESS(s2n_config_set_client_hello_cb_mode(config, S2N_CLIENT_HELLO_CB_NONBLOCKING));
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(server_conn, S2N_SELF_SERVICE_BLINDING));
server_conn->max_outgoing_fragment_length = server_fragment_size;
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(client_conn, S2N_SELF_SERVICE_BLINDING));
client_conn->max_outgoing_fragment_length = client_fragment_size;
struct s2n_io_wrapper_pair io_wrapper = { 0 };
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_connections_set_blocking_io_pair(&io_wrapper, client_conn, server_conn, &io_pair));
bool async_block_triggered = false;
while (s2n_negotiate_test_server_and_client(server_conn, client_conn) < S2N_SUCCESS) {
if (s2n_errno == S2N_ERR_ASYNC_BLOCKED) {
EXPECT_SUCCESS(s2n_client_hello_cb_done(server_conn));
async_block_triggered = true;
} else {
POSIX_ENSURE(s2n_errno, S2N_ERR_IO_BLOCKED);
}
}
EXPECT_TRUE(async_block_triggered);
/* Handshake completed */
EXPECT_TRUE(IS_NEGOTIATED(server_conn));
EXPECT_TRUE(IS_NEGOTIATED(client_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
};
/* Test: handshake with writer async callback and fragmented messages
*
* Resuming the handshake after an async callback follows a different code path.
*
* We use the async pkey callback because it triggers when writing the server cert verify message.
* It would also trigger for the client when reading the server cert verify message,
* except that this test disables x509 validation.
*/
{
DEFER_CLEANUP(struct s2n_config *config = s2n_test_config_new(chain_and_key),
s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_async_pkey_callback(config, async_pkey_test_fn));
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(server_conn, S2N_SELF_SERVICE_BLINDING));
server_conn->max_outgoing_fragment_length = server_fragment_size;
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(client_conn, S2N_SELF_SERVICE_BLINDING));
client_conn->max_outgoing_fragment_length = client_fragment_size;
struct s2n_io_wrapper_pair io_wrapper = { 0 };
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_connections_set_blocking_io_pair(&io_wrapper, client_conn, server_conn, &io_pair));
bool async_block_triggered = false;
while (s2n_negotiate_test_server_and_client(server_conn, client_conn) < S2N_SUCCESS) {
if (s2n_errno == S2N_ERR_ASYNC_BLOCKED) {
EXPECT_SUCCESS(s2n_async_pkey_op_apply(pkey_op, server_conn));
EXPECT_SUCCESS(s2n_async_pkey_op_free(pkey_op));
async_block_triggered = true;
} else {
POSIX_ENSURE(s2n_errno, S2N_ERR_IO_BLOCKED);
}
}
EXPECT_TRUE(async_block_triggered);
/* Handshake completed */
EXPECT_TRUE(IS_NEGOTIATED(server_conn));
EXPECT_TRUE(IS_NEGOTIATED(client_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
};
/* Test: handshake with early data and fragmented messages */
if (s2n_is_tls13_fully_supported()) {
uint8_t early_data_bytes[] = "hello world";
struct s2n_blob early_data = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&early_data, early_data_bytes, sizeof(early_data_bytes)));
DEFER_CLEANUP(struct s2n_config *config = s2n_test_config_new(chain_and_key),
s2n_config_ptr_free);
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(server_conn, S2N_SELF_SERVICE_BLINDING));
EXPECT_OK(s2n_append_test_psk_with_early_data(server_conn, early_data.size, &s2n_tls13_aes_256_gcm_sha384));
server_conn->max_outgoing_fragment_length = server_fragment_size;
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(client_conn, S2N_SELF_SERVICE_BLINDING));
EXPECT_OK(s2n_append_test_psk_with_early_data(client_conn, early_data.size, &s2n_tls13_aes_256_gcm_sha384));
client_conn->max_outgoing_fragment_length = client_fragment_size;
struct s2n_io_wrapper_pair io_wrapper = { 0 };
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_connections_set_blocking_io_pair(&io_wrapper, client_conn, server_conn, &io_pair));
uint8_t recv_buffer[sizeof(early_data_bytes)] = { 0 };
struct s2n_blob early_data_received = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&early_data_received, recv_buffer, sizeof(recv_buffer)));
EXPECT_ERROR_WITH_ERRNO(s2n_negotiate_test_server_and_client_with_early_data(server_conn, client_conn,
&early_data, &early_data_received),
S2N_ERR_IO_BLOCKED);
/* All early data received */
EXPECT_TRUE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_DATA(client_conn));
S2N_BLOB_EXPECT_EQUAL(early_data, early_data_received);
while (s2n_negotiate_test_server_and_client(server_conn, client_conn) < S2N_SUCCESS) {
POSIX_ENSURE(s2n_errno, S2N_ERR_IO_BLOCKED);
}
/* Handshake completed */
EXPECT_TRUE(IS_NEGOTIATED(server_conn));
EXPECT_TRUE(IS_NEGOTIATED(client_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
};
}
END_TEST();
}
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