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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_client_supported_groups.h"
#include "tls/s2n_kem_preferences.h"
#include "tls/s2n_security_policies.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls13.h"
/* Include the C file directly to allow testing of static functions */
#include "tls/extensions/s2n_client_supported_groups.c"
/* This test checks the logic in the function s2n_choose_supported_group, which should select the highest
* supported group or, if none are available, select NULL. */
int main()
{
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
/* Tests with default KEM preferences (kem_preferences_null) */
{
/* If the lists of mutually supported groups are empty, chosen group should be set to null */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
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);
EXPECT_EQUAL(kem_pref, &kem_preferences_null);
for (size_t i = 0; i < ecc_pref->count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_curves[i]);
}
for (size_t i = 0; i < kem_pref->tls13_kem_group_count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_kem_groups[i]);
}
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_SUCCESS(s2n_choose_supported_group(server_conn));
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* If the lists of mutually supported groups have one ECC match,
* the chosen group should be set to the ECC match. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
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);
EXPECT_EQUAL(kem_pref, &kem_preferences_null);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
for (size_t i = 0; i < ecc_pref->count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_curves[i]);
}
for (size_t i = 0; i < kem_pref->tls13_kem_group_count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_kem_groups[i]);
}
server_conn->kex_params.mutually_supported_curves[1] = ecc_pref->ecc_curves[1];
EXPECT_SUCCESS(s2n_choose_supported_group(server_conn));
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_EQUAL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve, ecc_pref->ecc_curves[1]);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* If the lists of mutually supported groups have several matches, the chosen group should be set to
* the highest supported ECC. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
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);
EXPECT_EQUAL(kem_pref, &kem_preferences_null);
for (size_t i = 0; i < ecc_pref->count; i++) {
server_conn->kex_params.mutually_supported_curves[i] = ecc_pref->ecc_curves[i];
}
for (size_t i = 0; i < kem_pref->tls13_kem_group_count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_kem_groups[i]);
}
EXPECT_SUCCESS(s2n_choose_supported_group(server_conn));
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_EQUAL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve, ecc_pref->ecc_curves[0]);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
};
/* Test for PQ */
{
const struct s2n_kem_preferences test_kem_prefs = {
.kem_count = 0,
.kems = NULL,
.tls13_kem_group_count = kem_preferences_all.tls13_kem_group_count,
.tls13_kem_groups = kem_preferences_all.tls13_kem_groups,
};
const struct s2n_security_policy test_pq_security_policy = {
.minimum_protocol_version = S2N_SSLv3,
.cipher_preferences = &cipher_preferences_test_all_tls13,
.kem_preferences = &test_kem_prefs,
.signature_preferences = &s2n_signature_preferences_20200207,
.ecc_preferences = &s2n_ecc_preferences_20200310,
};
/* If the server supports PQ, but the client didn't send any PQ IDs, mutually_supported_kem_groups will
* not be populated, and the highest preference ECC should be chosen. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_pq_security_policy;
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);
EXPECT_EQUAL(kem_pref, &test_kem_prefs);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
for (size_t i = 0; i < ecc_pref->count; i++) {
server_conn->kex_params.mutually_supported_curves[i] = ecc_pref->ecc_curves[i];
}
for (size_t i = 0; i < kem_pref->tls13_kem_group_count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_kem_groups[i]);
}
EXPECT_SUCCESS(s2n_choose_supported_group(server_conn));
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_EQUAL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve, ecc_pref->ecc_curves[0]);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* If server has multiple mutually supported KEM groups and ECC curves, the highest preferred KEM group
* should be chosen. */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_pq_security_policy;
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);
EXPECT_EQUAL(kem_pref, &test_kem_prefs);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
for (size_t i = 0; i < ecc_pref->count; i++) {
server_conn->kex_params.mutually_supported_curves[i] = ecc_pref->ecc_curves[i];
}
for (size_t i = 0; i < kem_pref->tls13_kem_group_count; i++) {
server_conn->kex_params.mutually_supported_kem_groups[i] = kem_pref->tls13_kem_groups[i];
}
EXPECT_SUCCESS(s2n_choose_supported_group(server_conn));
const struct s2n_kem_group *kem_group = s2n_kem_preferences_get_highest_priority_group(kem_pref);
if (s2n_pq_is_enabled()) {
EXPECT_NOT_NULL(kem_group);
EXPECT_EQUAL(server_conn->kex_params.server_kem_group_params.kem_group, kem_group);
EXPECT_EQUAL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve, kem_group->curve);
EXPECT_EQUAL(server_conn->kex_params.server_kem_group_params.kem_params.kem, kem_group->kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
} else {
EXPECT_NULL(kem_group);
}
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* If server has one mutually supported KEM group and multiple mutually supported ECC, the KEM
* group should be chosen.
* Need at least one available KEM to test fallback. */
uint32_t available_groups = 0;
EXPECT_OK(s2n_kem_preferences_groups_available(&kem_preferences_all, &available_groups));
if (available_groups >= 1) {
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_pq_security_policy;
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);
EXPECT_EQUAL(kem_pref, &test_kem_prefs);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
for (size_t i = 0; i < ecc_pref->count; i++) {
server_conn->kex_params.mutually_supported_curves[i] = ecc_pref->ecc_curves[i];
}
for (size_t i = 0; i < kem_pref->tls13_kem_group_count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_kem_groups[i]);
}
const struct s2n_kem_group *chosen_group = s2n_kem_preferences_get_highest_priority_group(kem_pref);
EXPECT_NOT_NULL(chosen_group);
server_conn->kex_params.mutually_supported_kem_groups[0] = chosen_group;
EXPECT_SUCCESS(s2n_choose_supported_group(server_conn));
EXPECT_EQUAL(server_conn->kex_params.server_kem_group_params.kem_group, chosen_group);
EXPECT_EQUAL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve, chosen_group->curve);
EXPECT_EQUAL(server_conn->kex_params.server_kem_group_params.kem_params.kem, chosen_group->kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
}
/* If there are no mutually supported KEM groups or ECC curves, chosen group should be set to null */
{
struct s2n_connection *server_conn = NULL;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
server_conn->security_policy_override = &test_pq_security_policy;
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);
EXPECT_EQUAL(kem_pref, &test_kem_prefs);
for (size_t i = 0; i < ecc_pref->count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_curves[i]);
}
for (size_t i = 0; i < kem_pref->tls13_kem_group_count; i++) {
EXPECT_NULL(server_conn->kex_params.mutually_supported_kem_groups[i]);
}
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_SUCCESS(s2n_choose_supported_group(server_conn));
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_group);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.ecc_params.negotiated_curve);
EXPECT_NULL(server_conn->kex_params.server_kem_group_params.kem_params.kem);
EXPECT_NULL(server_conn->kex_params.server_ecc_evp_params.negotiated_curve);
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
};
END_TEST();
return 0;
}
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