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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 <string.h>
#include "s2n_test.h"
#include "stuffer/s2n_stuffer.h"
#include "testlib/s2n_testlib.h"
#include "tests/s2n_test.h"
#include "tls/extensions/s2n_client_alpn.h"
#include "tls/extensions/s2n_npn.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
#define HTTP11 0x68, 0x74, 0x74, 0x70, 0x2f, 0x31, 0x2e, 0x31
#define SPDY1 0x73, 0x70, 0x64, 0x79, 0x2f, 0x31
#define SPDY2 0x73, 0x70, 0x64, 0x79, 0x2f, 0x32
#define SPDY3 0x73, 0x70, 0x64, 0x79, 0x2f, 0x33
S2N_RESULT s2n_calculate_padding(uint8_t protocol_len, uint8_t *padding_len);
int main(int argc, char **argv)
{
BEGIN_TEST();
const char *protocols[] = { "http/1.1", "spdy/1", "spdy/2" };
const uint8_t protocols_count = s2n_array_len(protocols);
/* Should-send tests on the client side */
{
/* No connection */
EXPECT_FALSE(s2n_client_npn_extension.should_send(NULL));
/* No config */
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
EXPECT_FALSE(s2n_client_npn_extension.should_send(client_conn));
/* No application protocols set */
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
EXPECT_FALSE(s2n_client_npn_extension.should_send(client_conn));
/* Application protocols set but NPN not supported. In this case the ALPN extension will be sent. */
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
EXPECT_FALSE(s2n_client_npn_extension.should_send(client_conn));
EXPECT_TRUE(s2n_client_alpn_extension.should_send(client_conn));
/* Both ALPN and NPN extensions will be sent */
client_conn->config->npn_supported = true;
EXPECT_TRUE(s2n_client_npn_extension.should_send(client_conn));
EXPECT_TRUE(s2n_client_alpn_extension.should_send(client_conn));
/*
*= https://datatracker.ietf.org/doc/id/draft-agl-tls-nextprotoneg-03#section-3
*= type=test
*# For the same reasons, after a handshake has been performed for a
*# given connection, renegotiations on the same connection MUST NOT
*# include the "next_protocol_negotiation" extension.
*/
client_conn->handshake.renegotiation = true;
EXPECT_FALSE(s2n_client_npn_extension.should_send(client_conn));
EXPECT_TRUE(s2n_client_alpn_extension.should_send(client_conn));
};
/* s2n_client_npn_recv */
{
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
/* NPN not supported */
EXPECT_SUCCESS(s2n_client_npn_extension.recv(server_conn, &extension));
EXPECT_FALSE(server_conn->npn_negotiated);
/* NPN supported */
server_conn->config->npn_supported = true;
EXPECT_SUCCESS(s2n_client_npn_extension.recv(server_conn, &extension));
EXPECT_TRUE(server_conn->npn_negotiated);
/* Server has already negotiated a protocol with the ALPN extension */
uint8_t first_protocol_len = strlen(protocols[0]);
EXPECT_MEMCPY_SUCCESS(server_conn->application_protocol, protocols[0], first_protocol_len + 1);
server_conn->npn_negotiated = false;
EXPECT_SUCCESS(s2n_client_npn_extension.recv(server_conn, &extension));
EXPECT_FALSE(server_conn->npn_negotiated);
};
/* Should-send tests on the server side */
{
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
/* NPN not negotiated */
EXPECT_FALSE(s2n_server_npn_extension.should_send(server_conn));
/* NPN negotiated */
server_conn->npn_negotiated = true;
EXPECT_TRUE(s2n_server_npn_extension.should_send(server_conn));
};
/* s2n_server_npn_send */
{
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
DEFER_CLEANUP(struct s2n_stuffer out = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
EXPECT_SUCCESS(s2n_server_npn_extension.send(server_conn, &out));
uint8_t protocol_len = 0;
uint8_t protocol[UINT8_MAX] = { 0 };
for (size_t i = 0; i < protocols_count; i++) {
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&out, &protocol_len));
EXPECT_EQUAL(protocol_len, strlen(protocols[i]));
EXPECT_SUCCESS(s2n_stuffer_read_bytes(&out, protocol, protocol_len));
EXPECT_BYTEARRAY_EQUAL(protocol, protocols[i], protocol_len);
}
EXPECT_EQUAL(s2n_stuffer_data_available(&out), 0);
};
/* s2n_server_npn_recv */
{
/* Client has no application protocols configured. Not sure how this
* could happen, but added to be thorough. */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
EXPECT_SUCCESS(s2n_server_npn_extension.recv(client_conn, &extension));
EXPECT_NULL(s2n_get_application_protocol(client_conn));
};
/* NPN recv extension can read NPN send extension */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
EXPECT_SUCCESS(s2n_server_npn_extension.send(client_conn, &extension));
EXPECT_SUCCESS(s2n_server_npn_extension.recv(client_conn, &extension));
/* Server sent the same list that the client configured so the first protocol in the list is chosen */
EXPECT_NOT_NULL(s2n_get_application_protocol(client_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(client_conn), protocols[0], strlen(protocols[0]));
};
/* No match exists */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
uint8_t protocol[] = { SPDY3 };
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, sizeof(protocol)));
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&extension, protocol, sizeof(protocol)));
/*
*= https://datatracker.ietf.org/doc/id/draft-agl-tls-nextprotoneg-03#section-4
*= type=test
*# In the event that the client doesn't support any of server's protocols, or
*# the server doesn't advertise any, it SHOULD select the first protocol
*# that it supports.
*/
EXPECT_SUCCESS(s2n_server_npn_extension.recv(client_conn, &extension));
EXPECT_NOT_NULL(s2n_get_application_protocol(client_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(client_conn), protocols[0], strlen(protocols[0]));
};
/* Server sends empty list */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
/*
*= https://datatracker.ietf.org/doc/id/draft-agl-tls-nextprotoneg-03#section-4
*= type=test
*# In the event that the client doesn't support any of server's protocols, or
*# the server doesn't advertise any, it SHOULD select the first protocol
*# that it supports.
*/
EXPECT_SUCCESS(s2n_server_npn_extension.recv(client_conn, &extension));
EXPECT_NOT_NULL(s2n_get_application_protocol(client_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(client_conn), protocols[0], strlen(protocols[0]));
};
/* Multiple matches exist and server's preferred choice is selected */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_protocol_preferences(config, protocols, protocols_count));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
uint8_t wire_bytes[] = {
/* Size and bytes of first protocol */
0x06,
SPDY1,
/* Size and bytes of second protocol */
0x08,
HTTP11,
/* Size and bytes of second protocol */
0x06,
SPDY2,
};
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&extension, wire_bytes, sizeof(wire_bytes)));
EXPECT_SUCCESS(s2n_server_npn_extension.recv(client_conn, &extension));
EXPECT_NOT_NULL(s2n_get_application_protocol(client_conn));
/* Client's second protocol is selected because the server prefers it over client's first protocol */
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(client_conn), protocols[1], strlen(protocols[1]));
};
};
/* Check application protocol array can hold the largest uint8_t value.
*
* We frequently copy a uint8_t's worth of data into this array. Adding
* checks to ensure that the array will be large enough causes compilers
* to give warnings that the check will always be true.
* This test will fail if we ever make that array smaller, so we remember
* to go back and add those checks.
*/
{
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
/* Not <= because the application protocol is a string, which needs to
* be terminated by a null character */
EXPECT_TRUE(UINT8_MAX < sizeof(server_conn->application_protocol));
};
END_TEST();
}
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