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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_server_key_share.h"
#include "tls/s2n_security_policies.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls13.h"
/* These tests check the server's logic when selecting a keyshare and supporting group. */
int main()
{
BEGIN_TEST();
/* Need at least two KEM's available to test fallback */
uint32_t available_groups = 0;
EXPECT_OK(s2n_kem_preferences_groups_available(&kem_preferences_all, &available_groups));
if (available_groups < 2) {
END_TEST();
return 0;
}
EXPECT_SUCCESS(s2n_enable_tls13_in_test());
/* If client and server have no mutually supported groups, abort the handshake without sending HRR. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_FAILURE_WITH_ERRNO(s2n_extensions_server_key_share_select(server_conn),
S2N_ERR_ECDHE_UNSUPPORTED_CURVE);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_FALSE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* If client has sent no valid keyshares, but server and client have a mutually supported EC curve,
* send Hello Retry Request. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(server_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
server_conn->kex_params.server_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[1];
EXPECT_NULL(server_conn->kex_params.mutually_supported_curves[0]);
server_conn->kex_params.mutually_supported_curves[1] = ecc_pref->ecc_curves[1];
EXPECT_NULL(server_conn->kex_params.client_ecc_evp_params.evp_pkey);
EXPECT_NULL(server_conn->kex_params.client_ecc_evp_params.negotiated_curve);
EXPECT_SUCCESS(s2n_extensions_server_key_share_select(server_conn));
EXPECT_EQUAL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve, ecc_pref->ecc_curves[1]);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_TRUE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* When client has only sent a valid keyshare for
* curve 1, Hello Retry Request is not sent and server chooses curve 1. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(server_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
/* Server would have initially chosen curve[0] when processing the supported_groups extension */
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
server_conn->kex_params.server_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[0];
server_conn->kex_params.mutually_supported_curves[0] = ecc_pref->ecc_curves[0];
server_conn->kex_params.mutually_supported_curves[1] = ecc_pref->ecc_curves[1];
EXPECT_NULL(server_conn->kex_params.client_ecc_evp_params.evp_pkey);
EXPECT_NULL(server_conn->kex_params.client_ecc_evp_params.negotiated_curve);
server_conn->kex_params.client_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[1];
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(&server_conn->kex_params.client_ecc_evp_params));
EXPECT_SUCCESS(s2n_extensions_server_key_share_select(server_conn));
/* Server should have updated it's choice to curve[1] after taking received keyshares into account */
EXPECT_EQUAL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve, ecc_pref->ecc_curves[1]);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_FALSE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
{
const struct s2n_security_policy test_security_policy = {
.minimum_protocol_version = S2N_SSLv3,
.cipher_preferences = &cipher_preferences_test_all_tls13,
.kem_preferences = &kem_preferences_all,
.signature_preferences = &s2n_signature_preferences_20200207,
.ecc_preferences = &s2n_ecc_preferences_20200310,
};
/* If both server_curve and server_kem_group are set (erroneous behavior), we should
* error and abort the handshake. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_security_policy;
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(server_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
const struct s2n_kem_preferences *kem_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_kem_preferences(server_conn, &kem_pref));
EXPECT_NOT_NULL(kem_pref);
server_conn->kex_params.server_ecc_evp_params.negotiated_curve = ecc_pref->ecc_curves[0];
server_conn->kex_params.server_kem_group_params.kem_group = kem_pref->tls13_kem_groups[0];
EXPECT_FAILURE_WITH_ERRNO(s2n_extensions_server_key_share_select(server_conn),
S2N_ERR_ECDHE_UNSUPPORTED_CURVE);
EXPECT_FALSE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* If client has sent no valid keyshares but server and client mutually support KEM group 1,
* select KEM group 1 and send Hello Retry Request. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_security_policy;
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
const struct s2n_kem_preferences *kem_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_kem_preferences(server_conn, &kem_pref));
EXPECT_NOT_NULL(kem_pref);
/* Server would have initially chosen kem_group[1] when processing the supported_groups extension */
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
struct s2n_kem_group_params *server_params = &server_conn->kex_params.server_kem_group_params;
const struct s2n_kem_group *kem_group1 = kem_pref->tls13_kem_groups[1];
server_params->kem_group = kem_group1;
server_params->kem_params.kem = kem_group1->kem;
server_params->ecc_params.negotiated_curve = kem_group1->curve;
/* 0 is not supported, 1 is */
EXPECT_NULL(server_conn->kex_params.mutually_supported_kem_groups[0]);
server_conn->kex_params.mutually_supported_kem_groups[1] = kem_group1;
/* No keyshares received */
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_params.public_key.data);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.ecc_params.evp_pkey);
EXPECT_SUCCESS(s2n_extensions_server_key_share_select(server_conn));
/* Server maintains its selection of KEM group 1, sends HRR */
EXPECT_EQUAL(server_params->kem_group, kem_group1);
EXPECT_EQUAL(server_params->kem_params.kem, kem_group1->kem);
EXPECT_EQUAL(server_params->ecc_params.negotiated_curve, kem_group1->curve);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_TRUE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* When client has only sent a valid keyshare for
* KEM group 1, Hello Retry Request is not sent and server chooses group 1. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_security_policy;
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
EXPECT_OK(s2n_set_all_mutually_supported_groups(server_conn));
const struct s2n_kem_preferences *kem_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_kem_preferences(server_conn, &kem_pref));
EXPECT_NOT_NULL(kem_pref);
/* Server would have initially chosen kem_group[0] when processing the supported_groups extension */
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
struct s2n_kem_group_params *server_params = &server_conn->kex_params.server_kem_group_params;
const struct s2n_kem_group *kem_group0 = kem_pref->tls13_kem_groups[0];
const struct s2n_kem_group *kem_group1 = kem_pref->tls13_kem_groups[1];
server_params->kem_group = kem_group0;
server_params->kem_params.kem = kem_group0->kem;
server_params->ecc_params.negotiated_curve = kem_group0->curve;
/* Received a keyshare for 1 only */
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_group);
struct s2n_kem_group_params *client_params = &server_conn->kex_params.client_kem_group_params;
client_params->kem_group = kem_group1;
client_params->kem_params.kem = kem_group1->kem;
client_params->ecc_params.negotiated_curve = kem_group1->curve;
EXPECT_SUCCESS(s2n_alloc(&client_params->kem_params.public_key, kem_group1->kem->public_key_length));
/* The PQ public key is fake; that's good enough for this test */
POSIX_CHECKED_MEMSET(client_params->kem_params.public_key.data, 1, kem_group1->kem->public_key_length);
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(&client_params->ecc_params));
EXPECT_SUCCESS(s2n_extensions_server_key_share_select(server_conn));
/* Server should have updated it's choice to kem_group[1] after taking received keyshares into account */
EXPECT_EQUAL(server_params->kem_group, kem_group1);
EXPECT_EQUAL(server_params->kem_params.kem, kem_group1->kem);
EXPECT_EQUAL(server_params->ecc_params.negotiated_curve, kem_group1->curve);
EXPECT_EQUAL(server_conn->kex_params.client_kem_group_params.kem_group, kem_group1);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_FALSE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* When client has sent a valid keyshares for group 0,
* Hello Retry Request is not sent and server chooses group 0. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_security_policy;
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
EXPECT_OK(s2n_set_all_mutually_supported_groups(server_conn));
const struct s2n_kem_preferences *kem_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_kem_preferences(server_conn, &kem_pref));
EXPECT_NOT_NULL(kem_pref);
/* Server would have initially chosen kem_group[0] when processing the supported_groups extension */
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
struct s2n_kem_group_params *server_params = &server_conn->kex_params.server_kem_group_params;
const struct s2n_kem_group *kem_group0 = kem_pref->tls13_kem_groups[0];
server_params->kem_group = kem_group0;
server_params->kem_params.kem = kem_group0->kem;
server_params->ecc_params.negotiated_curve = kem_group0->curve;
/* Received key shares for all KEM groups */
struct s2n_kem_group_params *client_params = &server_conn->kex_params.client_kem_group_params;
const struct s2n_kem_group *kem_group = kem_pref->tls13_kem_groups[0];
client_params->kem_group = kem_group;
client_params->kem_params.kem = kem_group->kem;
client_params->ecc_params.negotiated_curve = kem_group->curve;
EXPECT_SUCCESS(s2n_alloc(&client_params->kem_params.public_key, kem_group->kem->public_key_length));
/* The PQ public key is fake; that's good enough for this test */
POSIX_CHECKED_MEMSET(client_params->kem_params.public_key.data, 1, kem_group->kem->public_key_length);
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(&client_params->ecc_params));
EXPECT_SUCCESS(s2n_extensions_server_key_share_select(server_conn));
/* Server should still prefer kem_group[0] after taking received keyshares into account */
EXPECT_EQUAL(server_params->kem_group, kem_group0);
EXPECT_EQUAL(server_params->kem_params.kem, kem_group0->kem);
EXPECT_EQUAL(server_params->ecc_params.negotiated_curve, kem_group0->curve);
EXPECT_EQUAL(server_conn->kex_params.client_kem_group_params.kem_group, kem_group0);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_FALSE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* When client sent no valid keyshares,
* server should choose kem_group[0] and send HRR. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_security_policy;
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
EXPECT_OK(s2n_set_all_mutually_supported_groups(server_conn));
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(server_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
const struct s2n_kem_preferences *kem_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_kem_preferences(server_conn, &kem_pref));
EXPECT_NOT_NULL(kem_pref);
/* Server would have initially chosen kem_group[0] when processing the supported_groups extension */
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
struct s2n_kem_group_params *server_params = &server_conn->kex_params.server_kem_group_params;
const struct s2n_kem_group *kem_group0 = kem_pref->tls13_kem_groups[0];
server_params->kem_group = kem_group0;
server_params->kem_params.kem = kem_group0->kem;
server_params->ecc_params.negotiated_curve = kem_group0->curve;
/* No keyshares received */
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_params.public_key.data);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.ecc_params.evp_pkey);
EXPECT_SUCCESS(s2n_extensions_server_key_share_select(server_conn));
/* Server should still prefer kem_group[0], and send HRR */
EXPECT_EQUAL(server_params->kem_group, kem_group0);
EXPECT_EQUAL(server_params->kem_params.kem, kem_group0->kem);
EXPECT_EQUAL(server_params->ecc_params.negotiated_curve, kem_group0->curve);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_TRUE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* When client sent valid keyshares
* for everything, server should choose kem_group[0] and not send HRR. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_security_policy;
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
EXPECT_OK(s2n_set_all_mutually_supported_groups(server_conn));
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(server_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
const struct s2n_kem_preferences *kem_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_kem_preferences(server_conn, &kem_pref));
EXPECT_NOT_NULL(kem_pref);
/* Server would have initially chosen kem_group[0] when processing the supported_groups extension */
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
struct s2n_kem_group_params *server_params = &server_conn->kex_params.server_kem_group_params;
const struct s2n_kem_group *kem_group0 = kem_pref->tls13_kem_groups[0];
server_params->kem_group = kem_group0;
server_params->kem_params.kem = kem_group0->kem;
server_params->ecc_params.negotiated_curve = kem_group0->curve;
/* Receive highest priority KEM share */
struct s2n_kem_group_params *client_kem_params = &server_conn->kex_params.client_kem_group_params;
const struct s2n_kem_group *kem_group = kem_pref->tls13_kem_groups[0];
client_kem_params->kem_group = kem_group;
client_kem_params->kem_params.kem = kem_group->kem;
client_kem_params->ecc_params.negotiated_curve = kem_group->curve;
EXPECT_SUCCESS(s2n_alloc(&client_kem_params->kem_params.public_key, kem_group->kem->public_key_length));
/* The PQ public key is fake; that's good enough for this test */
POSIX_CHECKED_MEMSET(client_kem_params->kem_params.public_key.data, 1, kem_group->kem->public_key_length);
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(&client_kem_params->ecc_params));
/* Receive highest priority ECC share */
struct s2n_ecc_evp_params *client_params = &server_conn->kex_params.client_ecc_evp_params;
client_params->negotiated_curve = ecc_pref->ecc_curves[0];
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(client_params));
EXPECT_SUCCESS(s2n_extensions_server_key_share_select(server_conn));
/* Server should still prefer kem_group[0], no HRR */
EXPECT_EQUAL(server_params->kem_group, kem_group0);
EXPECT_EQUAL(server_params->kem_params.kem, kem_group0->kem);
EXPECT_EQUAL(server_params->ecc_params.negotiated_curve, kem_group0->curve);
EXPECT_EQUAL(server_conn->kex_params.client_kem_group_params.kem_group, kem_group0);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_FALSE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* When client sent valid keyshares
* only for ECC, server should choose curves[0] and not send HRR. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_security_policy;
EXPECT_SUCCESS(s2n_connection_set_all_protocol_versions(server_conn, S2N_TLS13));
EXPECT_OK(s2n_set_all_mutually_supported_groups(server_conn));
const struct s2n_ecc_preferences *ecc_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_ecc_preferences(server_conn, &ecc_pref));
EXPECT_NOT_NULL(ecc_pref);
const struct s2n_kem_preferences *kem_pref = NULL;
EXPECT_SUCCESS(s2n_connection_get_kem_preferences(server_conn, &kem_pref));
EXPECT_NOT_NULL(kem_pref);
/* Server would have initially chosen kem_group[0] when processing the supported_groups extension */
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
struct s2n_kem_group_params *server_params = &server_conn->kex_params.server_kem_group_params;
const struct s2n_kem_group *kem_group0 = kem_pref->tls13_kem_groups[0];
server_params->kem_group = kem_group0;
server_params->kem_params.kem = kem_group0->kem;
server_params->ecc_params.negotiated_curve = kem_group0->curve;
/* No keyshares received */
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_params.public_key.data);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.ecc_params.evp_pkey);
/* Highest priority keyshare chosen */
struct s2n_ecc_evp_params *client_params = &server_conn->kex_params.client_ecc_evp_params;
client_params->negotiated_curve = ecc_pref->ecc_curves[0];
EXPECT_SUCCESS(s2n_ecc_evp_generate_ephemeral_key(client_params));
EXPECT_SUCCESS(s2n_extensions_server_key_share_select(server_conn));
/* Server should update its choice to curve[0], no HRR */
EXPECT_EQUAL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve, ecc_pref->ecc_curves[0]);
EXPECT_NULL(server_params->kem_group);
EXPECT_NULL(server_params->kem_params.kem);
EXPECT_NULL(server_params->ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.client_kem_group_params.kem_group);
EXPECT_FALSE(s2n_is_hello_retry_handshake(server_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
};
END_TEST();
return 0;
}
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