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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_psk_key_exchange_modes.h"
int main(int argc, char **argv)
{
BEGIN_TEST();
/* Test: s2n_psk_key_exchange_modes_send */
{
struct s2n_stuffer out = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_psk_key_exchange_modes_extension.send(conn, &out));
uint8_t psk_ke_modes_size = 0;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&out, &psk_ke_modes_size));
EXPECT_EQUAL(psk_ke_modes_size, PSK_KEY_EXCHANGE_MODE_SIZE);
uint8_t psk_ke_mode = S2N_PSK_KE_UNKNOWN;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&out, &psk_ke_mode));
EXPECT_EQUAL(psk_ke_mode, TLS_PSK_DHE_KE_MODE);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_stuffer_free(&out));
};
/* Test: s2n_psk_key_exchange_modes_recv */
{
/* Receive an extension when running TLS1.2 */
{
struct s2n_stuffer out = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
/* Incorrect protocol version */
conn->actual_protocol_version = S2N_TLS12;
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, PSK_KEY_EXCHANGE_MODE_SIZE));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, TLS_PSK_DHE_KE_MODE));
EXPECT_SUCCESS(s2n_extension_recv(&s2n_psk_key_exchange_modes_extension, conn, &out));
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_stuffer_free(&out));
};
/* Length of extension is greater than contents of extension */
{
struct s2n_stuffer out = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
conn->actual_protocol_version = S2N_TLS13;
/* Incorrect length */
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, PSK_KEY_EXCHANGE_MODE_SIZE + 1));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, TLS_PSK_DHE_KE_MODE));
EXPECT_SUCCESS(s2n_psk_key_exchange_modes_extension.recv(conn, &out));
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_stuffer_free(&out));
};
/* Receives valid psk_ke mode */
{
struct s2n_stuffer out = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, PSK_KEY_EXCHANGE_MODE_SIZE));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, TLS_PSK_KE_MODE));
EXPECT_SUCCESS(s2n_psk_key_exchange_modes_extension.recv(conn, &out));
/* s2n currently does not support the psk_ke mode */
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_stuffer_free(&out));
};
/* Receives list of supported and unsupported psk key exchange modes */
{
struct s2n_stuffer out = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, PSK_KEY_EXCHANGE_MODE_SIZE * 2));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, TLS_PSK_KE_MODE));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&out, TLS_PSK_DHE_KE_MODE));
EXPECT_SUCCESS(s2n_psk_key_exchange_modes_extension.recv(conn, &out));
/* s2n chooses the only currently supported psk key exchange mode */
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_DHE_KE);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_stuffer_free(&out));
};
/* Server receives GREASE values.
*
*= https://www.rfc-editor.org/rfc/rfc8701#section-3.1
*= type=test
*# A client MAY select one or more GREASE PskKeyExchangeMode values
*# and advertise them in the "psk_key_exchange_modes" extension, if
*# sent.
*
*= https://www.rfc-editor.org/rfc/rfc8701#section-3.2
*= type=test
*# When processing a ClientHello, servers MUST NOT treat GREASE values
*# differently from any unknown value. Servers MUST NOT negotiate any
*# GREASE value when offered in a ClientHello. Servers MUST correctly
*# ignore unknown values in a ClientHello and attempt to negotiate with
*# one of the remaining parameters.
**/
{
DEFER_CLEANUP(struct s2n_stuffer extension = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&extension, 0));
struct s2n_stuffer_reservation modes_size = { 0 };
EXPECT_SUCCESS(s2n_stuffer_reserve_uint8(&extension, &modes_size));
/*
*= https://www.rfc-editor.org/rfc/rfc8701#section-2
*= type=test
*# The following values are reserved as GREASE values for
*# PskKeyExchangeModes:
*#
*# 0x0B
*#
*# 0x2A
*#
*# 0x49
*#
*# 0x68
*#
*# 0x87
*#
*# 0xA6
*#
*# 0xC5
*#
*# 0xE4
*/
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0x0B));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0x2A));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0x49));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0x68));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0x87));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0xA6));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0xC5));
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, 0xE4));
EXPECT_SUCCESS(s2n_stuffer_write_vector_size(&modes_size));
/* No valid non-GREASE option */
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_psk_key_exchange_modes_extension.recv(conn, &extension));
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_stuffer_reread(&extension));
};
/* Valid non-GREASE option */
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
conn->actual_protocol_version = S2N_TLS13;
/* Add the valid option and rewrite size */
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&extension, TLS_PSK_DHE_KE_MODE));
EXPECT_SUCCESS(s2n_stuffer_write_vector_size(&modes_size));
EXPECT_SUCCESS(s2n_psk_key_exchange_modes_extension.recv(conn, &extension));
EXPECT_EQUAL(conn->psk_params.psk_ke_mode, S2N_PSK_DHE_KE);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_stuffer_reread(&extension));
};
};
};
/* Test: s2n_psk_key_exchange_modes_should_send */
{
/* When neither resumption nor PSKs are enabled, the extension should not be sent. */
{
DEFER_CLEANUP(struct s2n_config *no_resumption_config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(no_resumption_config);
EXPECT_SUCCESS(s2n_config_set_session_tickets_onoff(no_resumption_config, false));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(conn, no_resumption_config));
EXPECT_FALSE(s2n_psk_key_exchange_modes_extension.should_send(conn));
};
/* When session resumption is enabled, the extension should be sent. */
{
DEFER_CLEANUP(struct s2n_config *resumption_config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(resumption_config);
EXPECT_SUCCESS(s2n_config_set_session_tickets_onoff(resumption_config, true));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(conn, resumption_config));
EXPECT_TRUE(s2n_psk_key_exchange_modes_extension.should_send(conn));
};
/* When a client is using out-of-band PSKs, the extension should be sent. */
{
DEFER_CLEANUP(struct s2n_config *psk_config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(psk_config);
EXPECT_SUCCESS(s2n_config_set_session_tickets_onoff(psk_config, false));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(conn, psk_config));
DEFER_CLEANUP(struct s2n_psk *psk = s2n_test_psk_new(conn), s2n_psk_free);
EXPECT_SUCCESS(s2n_connection_append_psk(conn, psk));
EXPECT_TRUE(s2n_psk_key_exchange_modes_extension.should_send(conn));
};
};
/* Functional test */
{
struct s2n_stuffer out = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&out, 0));
struct s2n_connection *server_conn;
struct s2n_connection *client_conn;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
EXPECT_EQUAL(server_conn->psk_params.psk_ke_mode, S2N_PSK_KE_UNKNOWN);
server_conn->actual_protocol_version = S2N_TLS13;
client_conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_psk_key_exchange_modes_extension.send(client_conn, &out));
EXPECT_SUCCESS(s2n_psk_key_exchange_modes_extension.recv(server_conn, &out));
EXPECT_EQUAL(server_conn->psk_params.psk_ke_mode, S2N_PSK_DHE_KE);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_stuffer_free(&out));
};
END_TEST();
}
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