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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 "s2n_test.h"
#include "stuffer/s2n_stuffer.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
S2N_RESULT s2n_calculate_padding(uint8_t protocol_len, uint8_t *padding_len);
S2N_RESULT s2n_write_npn_protocol(struct s2n_connection *conn, struct s2n_stuffer *out);
S2N_RESULT s2n_read_npn_protocol(struct s2n_connection *conn, struct s2n_stuffer *in);
int main(int argc, char **argv)
{
BEGIN_TEST();
const char *protocols[] = { "http/1.1", "spdy/1", "spdy/2" };
/* Test s2n_next_protocol_send */
{
/* Safety checks */
EXPECT_FAILURE(s2n_next_protocol_send(NULL));
/* Should fail for >= TLS1.3 */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
/* Fails for TLS1.3 */
client_conn->actual_protocol_version = S2N_TLS13;
EXPECT_FAILURE_WITH_ERRNO(s2n_next_protocol_send(client_conn), S2N_ERR_BAD_MESSAGE);
/* Succeeds for TLS1.2 */
client_conn->actual_protocol_version = S2N_TLS12;
EXPECT_SUCCESS(s2n_next_protocol_send(client_conn));
};
};
/* Test s2n_next_protocol_recv */
{
/* Safety checks */
EXPECT_FAILURE(s2n_next_protocol_recv(NULL));
/* Should parse s2n_next_protocol_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_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
client_conn->actual_protocol_version = S2N_TLS12;
char protocol[] = { "http/1.1" };
uint8_t protocol_len = strlen(protocol);
EXPECT_MEMCPY_SUCCESS(client_conn->application_protocol, protocol, protocol_len + 1);
struct s2n_stuffer *stuffer = &client_conn->handshake.io;
EXPECT_SUCCESS(s2n_next_protocol_send(client_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(stuffer, &server_conn->handshake.io, s2n_stuffer_data_available(stuffer)));
/* Fails for TLS1.3 */
server_conn->actual_protocol_version = S2N_TLS13;
EXPECT_FAILURE_WITH_ERRNO(s2n_next_protocol_recv(server_conn), S2N_ERR_BAD_MESSAGE);
/* Succeeds for TLS1.2 */
server_conn->actual_protocol_version = S2N_TLS12;
EXPECT_SUCCESS(s2n_next_protocol_recv(server_conn));
EXPECT_EQUAL(s2n_stuffer_data_available(&server_conn->handshake.io), 0);
EXPECT_BYTEARRAY_EQUAL(client_conn->application_protocol, server_conn->application_protocol, protocol_len);
};
};
/* s2n_write_npn_protocol */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
uint8_t first_protocol_len = strlen(protocols[0]);
EXPECT_MEMCPY_SUCCESS(client_conn->application_protocol, protocols[0], first_protocol_len + 1);
DEFER_CLEANUP(struct s2n_stuffer out = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
EXPECT_OK(s2n_write_npn_protocol(client_conn, &out));
uint8_t protocol_len = 0;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&out, &protocol_len));
uint8_t protocol[UINT8_MAX] = { 0 };
EXPECT_SUCCESS(s2n_stuffer_read_bytes(&out, protocol, protocol_len));
EXPECT_BYTEARRAY_EQUAL(protocol, protocols[0], protocol_len);
uint8_t padding_len = 0;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&out, &padding_len));
EXPECT_TRUE(padding_len > 0);
for (size_t i = 0; i < padding_len; i++) {
uint8_t byte = UINT8_MAX;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&out, &byte));
EXPECT_EQUAL(byte, 0);
}
EXPECT_EQUAL(s2n_stuffer_data_available(&out), 0);
};
/* s2n_read_npn_protocol can parse s2n_write_npn_protocol */
{
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_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
uint8_t first_protocol_len = strlen(protocols[0]);
EXPECT_MEMCPY_SUCCESS(client_conn->application_protocol, protocols[0], first_protocol_len + 1);
DEFER_CLEANUP(struct s2n_stuffer out = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
EXPECT_OK(s2n_write_npn_protocol(client_conn, &out));
EXPECT_OK(s2n_read_npn_protocol(server_conn, &out));
EXPECT_NOT_NULL(s2n_get_application_protocol(server_conn));
EXPECT_BYTEARRAY_EQUAL(s2n_get_application_protocol(server_conn), protocols[0], strlen(protocols[0]));
};
/* s2n_read_npn_protocol can read empty message */
{
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_stuffer out = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
/* Zero-length protocol */
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, 0));
uint8_t padding_len = 0;
EXPECT_OK(s2n_calculate_padding(0, &padding_len));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, padding_len));
for (size_t i = 0; i < padding_len; i++) {
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, 0));
}
EXPECT_OK(s2n_read_npn_protocol(server_conn, &out));
EXPECT_NULL(s2n_get_application_protocol(server_conn));
};
/* s2n_read_npn_protocol errors on malformed message */
{
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
uint8_t wire_bytes[] = {
/* Incorrect length of protocol */
0x10,
};
DEFER_CLEANUP(struct s2n_stuffer out = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&out, wire_bytes, sizeof(wire_bytes)));
EXPECT_ERROR_WITH_ERRNO(s2n_read_npn_protocol(server_conn, &out), S2N_ERR_NULL);
};
/* s2n_read_npn_protocol errors on malformed padding */
{
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER), s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
uint8_t wire_bytes[] = {
/* Zero-length protocol */
0x00,
0x00,
/* Padding character is not zero */
0x01,
0xFF,
};
DEFER_CLEANUP(struct s2n_stuffer out = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&out, wire_bytes, sizeof(wire_bytes)));
EXPECT_ERROR_WITH_ERRNO(s2n_read_npn_protocol(server_conn, &out), S2N_ERR_SAFETY);
};
/*
*= https://datatracker.ietf.org/doc/id/draft-agl-tls-nextprotoneg-03#section-3
*= type=test
*# The length of "padding" SHOULD be 32 - ((len(selected_protocol) + 2) % 32).
*/
{
struct {
uint8_t protocol_len;
uint8_t expected_padding;
} test_cases[] = {
{ .protocol_len = 0, .expected_padding = 30 },
{ .protocol_len = 32, .expected_padding = 30 },
{ .protocol_len = 17, .expected_padding = 13 },
{ .protocol_len = 2, .expected_padding = 28 },
{ .protocol_len = UINT8_MAX, .expected_padding = 31 },
{ .protocol_len = 30, .expected_padding = 32 },
};
for (size_t i = 0; i < s2n_array_len(test_cases); i++) {
uint8_t output = 0;
EXPECT_OK(s2n_calculate_padding(test_cases[i].protocol_len, &output));
EXPECT_EQUAL(output, test_cases[i].expected_padding);
}
};
END_TEST();
}
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