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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 "testlib/s2n_testlib.h"
#include "tls/extensions/s2n_early_data_indication.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls13.h"
#include "utils/s2n_array.h"
static S2N_RESULT s2n_exchange_hellos(struct s2n_connection *client_conn, struct s2n_connection *server_conn)
{
RESULT_GUARD_POSIX(s2n_client_hello_send(client_conn));
RESULT_GUARD_POSIX(s2n_stuffer_copy(&client_conn->handshake.io, &server_conn->handshake.io,
s2n_stuffer_data_available(&client_conn->handshake.io)));
RESULT_GUARD_POSIX(s2n_establish_session(server_conn));
RESULT_GUARD_POSIX(s2n_server_hello_send(server_conn));
RESULT_GUARD_POSIX(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io,
s2n_stuffer_data_available(&server_conn->handshake.io)));
RESULT_GUARD_POSIX(s2n_server_hello_recv(client_conn));
return S2N_RESULT_OK;
}
int main(int argc, char **argv)
{
BEGIN_TEST();
if (!s2n_is_tls13_fully_supported()) {
END_TEST();
}
const uint32_t nonzero_max_early_data = 10;
/* Test s2n_server_early_data_indication_should_send */
{
/* Safety check */
EXPECT_FALSE(s2n_server_early_data_indication_extension.should_send(NULL));
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
conn->early_data_state = S2N_EARLY_DATA_NOT_REQUESTED;
EXPECT_FALSE(s2n_server_early_data_indication_extension.should_send(conn));
conn->early_data_state = S2N_EARLY_DATA_REJECTED;
EXPECT_FALSE(s2n_server_early_data_indication_extension.should_send(conn));
conn->early_data_state = S2N_EARLY_DATA_ACCEPTED;
EXPECT_TRUE(s2n_server_early_data_indication_extension.should_send(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Test s2n_server_early_data_indication_is_missing */
{
/* No-op if early data not requested */
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
conn->early_data_state = S2N_EARLY_DATA_NOT_REQUESTED;
EXPECT_SUCCESS(s2n_server_early_data_indication_extension.if_missing(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_NOT_REQUESTED);
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_SUCCESS(s2n_server_early_data_indication_extension.if_missing(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
/* Test s2n_server_early_data_indication_recv */
{
struct s2n_stuffer stuffer = { 0 };
/* Fails if early data config does not match the connection */
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->actual_protocol_version = S2N_TLS13;
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
/* No early data configured */
EXPECT_FAILURE_WITH_ERRNO(s2n_server_early_data_indication_extension.recv(conn, &stuffer),
S2N_ERR_EARLY_DATA_NOT_ALLOWED);
EXPECT_NOT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
/* Early data correctly configured */
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
EXPECT_SUCCESS(s2n_server_early_data_indication_extension.recv(conn, &stuffer));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Fails if early data not requested */
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
/* Early data not requested */
conn->early_data_state = S2N_EARLY_DATA_NOT_REQUESTED;
EXPECT_FAILURE_WITH_ERRNO(s2n_server_early_data_indication_extension.recv(conn, &stuffer),
S2N_ERR_INVALID_EARLY_DATA_STATE);
/* Early data requested */
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_SUCCESS(s2n_server_early_data_indication_extension.recv(conn, &stuffer));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
/* Test state transitions */
{
const char *security_policy = "20190801";
struct s2n_cipher_suite *expected_cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
/* When early data not requested */
{
struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(client_conn);
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(client_conn, 0, expected_cipher_suite));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client_conn, security_policy));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(server_conn);
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(server_conn, 0, expected_cipher_suite));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server_conn, security_policy));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_OK(s2n_exchange_hellos(client_conn, server_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_NOT_REQUESTED);
EXPECT_EQUAL(server_conn->early_data_state, S2N_EARLY_DATA_NOT_REQUESTED);
EXPECT_SUCCESS(s2n_encrypted_extensions_send(server_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io,
s2n_stuffer_data_available(&server_conn->handshake.io)));
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(client_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_NOT_REQUESTED);
EXPECT_EQUAL(server_conn->early_data_state, S2N_EARLY_DATA_NOT_REQUESTED);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/** When early data accepted.
*
*= https://tools.ietf.org/rfc/rfc8446#section-4.2.10
*= type=test
*# A server which receives an "early_data" extension MUST behave in one
*# of three ways:
*
*= https://tools.ietf.org/rfc/rfc8446#section-4.2.10
*= type=test
*# - Return its own "early_data" extension in EncryptedExtensions,
*# indicating that it intends to process the early data.
**/
{
struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(client_conn);
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(client_conn, nonzero_max_early_data, expected_cipher_suite));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client_conn, security_policy));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(server_conn);
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(server_conn, nonzero_max_early_data, expected_cipher_suite));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server_conn, security_policy));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_OK(s2n_exchange_hellos(client_conn, server_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
EXPECT_EQUAL(server_conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
EXPECT_SUCCESS(s2n_encrypted_extensions_send(server_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io,
s2n_stuffer_data_available(&server_conn->handshake.io)));
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(client_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
EXPECT_EQUAL(server_conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/** When early data rejected.
*
*= https://tools.ietf.org/rfc/rfc8446#section-4.2.10
*# A server which receives an "early_data" extension MUST behave in one
*# of three ways:
*#
*# - Ignore the extension and return a regular 1-RTT response.
**/
{
struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(client_conn);
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(client_conn, nonzero_max_early_data, expected_cipher_suite));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client_conn, security_policy));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(server_conn);
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(server_conn, 0, expected_cipher_suite));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server_conn, security_policy));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_OK(s2n_exchange_hellos(client_conn, server_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
EXPECT_EQUAL(server_conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_SUCCESS(s2n_encrypted_extensions_send(server_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io,
s2n_stuffer_data_available(&server_conn->handshake.io)));
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(client_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_EQUAL(server_conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/*
*= https://tools.ietf.org/rfc/rfc8446#section-4.2.10
*= type=test
*# A server which receives an "early_data" extension MUST behave in one
*# of three ways:
*
*= https://tools.ietf.org/rfc/rfc8446#section-4.2.10
*= type=test
*# - Request that the client send another ClientHello by responding
*# with a HelloRetryRequest.
**/
{
struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(client_conn);
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(client_conn, nonzero_max_early_data, expected_cipher_suite));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client_conn, security_policy));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(server_conn);
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(server_conn, nonzero_max_early_data, expected_cipher_suite));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server_conn, security_policy));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_SUCCESS(s2n_client_hello_send(client_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&client_conn->handshake.io, &server_conn->handshake.io,
s2n_stuffer_data_available(&client_conn->handshake.io)));
EXPECT_SUCCESS(s2n_client_hello_recv(server_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
/* Force a retry. The S2N server does not reject early data via HRR, so we have
* to manually trigger the retry. */
server_conn->early_data_state = S2N_EARLY_DATA_REJECTED;
EXPECT_SUCCESS(s2n_set_hello_retry_required(server_conn));
server_conn->handshake.message_number = 2;
client_conn->handshake.message_number = 2;
/* Update the selected_group to ensure the HRR is valid */
client_conn->kex_params.client_ecc_evp_params.negotiated_curve = &s2n_ecc_curve_secp521r1;
EXPECT_SUCCESS(s2n_server_hello_retry_send(server_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io,
s2n_stuffer_data_available(&server_conn->handshake.io)));
EXPECT_SUCCESS(s2n_server_hello_recv(client_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_EQUAL(server_conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_SUCCESS(s2n_encrypted_extensions_send(server_conn));
EXPECT_SUCCESS(s2n_stuffer_copy(&server_conn->handshake.io, &client_conn->handshake.io,
s2n_stuffer_data_available(&server_conn->handshake.io)));
EXPECT_SUCCESS(s2n_encrypted_extensions_recv(client_conn));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_EQUAL(server_conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
};
END_TEST();
return 0;
}
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