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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 "tls/extensions/s2n_server_max_fragment_length.h"
#include "tls/s2n_tls.h"
int main(int argc, char **argv)
{
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
/* Test should_send */
{
struct s2n_config *config;
EXPECT_NOT_NULL(config = s2n_config_new());
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
/* Should not send by default */
EXPECT_FALSE(s2n_server_max_fragment_length_extension.should_send(conn));
/* Should send if mfl code set. It is set by the client version of this extension. */
conn->negotiated_mfl_code = S2N_TLS_MAX_FRAG_LEN_512;
EXPECT_TRUE(s2n_server_max_fragment_length_extension.should_send(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
/* Test send */
{
struct s2n_config *config;
EXPECT_NOT_NULL(config = s2n_config_new());
EXPECT_SUCCESS(s2n_config_send_max_fragment_length(config, S2N_TLS_MAX_FRAG_LEN_512));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
struct s2n_stuffer stuffer = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));
conn->negotiated_mfl_code = S2N_TLS_MAX_FRAG_LEN_512;
EXPECT_SUCCESS(s2n_server_max_fragment_length_extension.send(conn, &stuffer));
/* Should have correct fragment length */
uint8_t actual_fragment_length;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&stuffer, &actual_fragment_length));
EXPECT_EQUAL(actual_fragment_length, S2N_TLS_MAX_FRAG_LEN_512);
EXPECT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
/* Test receive - does not match requested value
*
*= https://tools.ietf.org/rfc/rfc6066#section-4
*= type=test
*# Similarly, if a client
*# receives a maximum fragment length negotiation response that differs
*# from the length it requested, it MUST also abort the handshake with
*# an "illegal_parameter" alert.
*/
{
struct s2n_config *config;
EXPECT_NOT_NULL(config = s2n_config_new());
EXPECT_SUCCESS(s2n_config_send_max_fragment_length(config, S2N_TLS_MAX_FRAG_LEN_512));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
struct s2n_stuffer stuffer = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));
conn->negotiated_mfl_code = S2N_TLS_MAX_FRAG_LEN_1024;
EXPECT_SUCCESS(s2n_server_max_fragment_length_extension.send(conn, &stuffer));
EXPECT_FAILURE_WITH_ERRNO(s2n_server_max_fragment_length_extension.recv(conn, &stuffer),
S2N_ERR_MAX_FRAG_LEN_MISMATCH);
EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
/* Test receive */
{
struct s2n_config *config;
EXPECT_NOT_NULL(config = s2n_config_new());
EXPECT_SUCCESS(s2n_config_send_max_fragment_length(config, S2N_TLS_MAX_FRAG_LEN_512));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
struct s2n_stuffer stuffer = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));
conn->negotiated_mfl_code = S2N_TLS_MAX_FRAG_LEN_512;
EXPECT_SUCCESS(s2n_server_max_fragment_length_extension.send(conn, &stuffer));
EXPECT_NOT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
conn->negotiated_mfl_code = 0;
EXPECT_SUCCESS(s2n_server_max_fragment_length_extension.recv(conn, &stuffer));
EXPECT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
EXPECT_EQUAL(conn->negotiated_mfl_code, S2N_TLS_MAX_FRAG_LEN_512);
EXPECT_EQUAL(conn->max_outgoing_fragment_length, 512);
EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
/* Test receive - existing mfl value */
{
struct s2n_config *config;
EXPECT_NOT_NULL(config = s2n_config_new());
EXPECT_SUCCESS(s2n_config_send_max_fragment_length(config, S2N_TLS_MAX_FRAG_LEN_1024));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
struct s2n_stuffer stuffer = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));
/* Existing mfl value lower */
{
conn->max_outgoing_fragment_length = mfl_code_to_length[S2N_TLS_MAX_FRAG_LEN_512];
conn->negotiated_mfl_code = S2N_TLS_MAX_FRAG_LEN_1024;
EXPECT_SUCCESS(s2n_server_max_fragment_length_extension.send(conn, &stuffer));
EXPECT_NOT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
conn->negotiated_mfl_code = 0;
EXPECT_SUCCESS(s2n_server_max_fragment_length_extension.recv(conn, &stuffer));
EXPECT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
EXPECT_EQUAL(conn->negotiated_mfl_code, S2N_TLS_MAX_FRAG_LEN_1024);
EXPECT_EQUAL(conn->max_outgoing_fragment_length, mfl_code_to_length[S2N_TLS_MAX_FRAG_LEN_512]);
};
/* Existing mfl value higher */
{
conn->max_outgoing_fragment_length = mfl_code_to_length[S2N_TLS_MAX_FRAG_LEN_2048];
conn->negotiated_mfl_code = S2N_TLS_MAX_FRAG_LEN_1024;
EXPECT_SUCCESS(s2n_server_max_fragment_length_extension.send(conn, &stuffer));
EXPECT_NOT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
conn->negotiated_mfl_code = 0;
EXPECT_SUCCESS(s2n_server_max_fragment_length_extension.recv(conn, &stuffer));
EXPECT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
EXPECT_EQUAL(conn->negotiated_mfl_code, S2N_TLS_MAX_FRAG_LEN_1024);
EXPECT_EQUAL(conn->max_outgoing_fragment_length, mfl_code_to_length[S2N_TLS_MAX_FRAG_LEN_1024]);
};
EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
END_TEST();
return 0;
}
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