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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 <stdio.h>
#include <string.h>
#include "api/s2n.h"
#include "crypto/s2n_certificate.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "utils/s2n_safety.h"
struct wildcardify_test_case {
const char *hostname;
const char *output;
};
struct wildcardify_test_case wildcardify_test_cases[] = {
{ .hostname = "foo.bar.com", .output = "*.bar.com" },
{ .hostname = "localhost", .output = NULL },
{ .hostname = "one.com", .output = "*.com" },
{ .hostname = "foo*.bar*.com*", .output = "*.bar*.com*" },
{ .hostname = "foo.bar.com.", .output = "*.bar.com." },
{ .hostname = "*.a.c", .output = "*.a.c" },
{ .hostname = "*", .output = NULL },
{ .hostname = "foo.", .output = "*." },
};
int main(int argc, char **argv)
{
BEGIN_TEST();
const int num_wildcardify_tests = s2n_array_len(wildcardify_test_cases);
for (size_t i = 0; i < num_wildcardify_tests; i++) {
const char *hostname = wildcardify_test_cases[i].hostname;
struct s2n_blob hostname_blob = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&hostname_blob, (uint8_t *) (uintptr_t) hostname, strlen(hostname)));
uint8_t output[S2N_MAX_SERVER_NAME] = { 0 };
struct s2n_blob output_blob = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&output_blob, (uint8_t *) (uintptr_t) output, sizeof(output)));
struct s2n_stuffer hostname_stuffer = { 0 };
struct s2n_stuffer output_stuffer = { 0 };
EXPECT_SUCCESS(s2n_stuffer_init(&hostname_stuffer, &hostname_blob));
EXPECT_SUCCESS(s2n_stuffer_skip_write(&hostname_stuffer, hostname_blob.size));
EXPECT_SUCCESS(s2n_stuffer_init(&output_stuffer, &output_blob));
EXPECT_SUCCESS(s2n_create_wildcard_hostname(&hostname_stuffer, &output_stuffer));
/* Make sure the wildcard generated matches the output we expect. */
const uint32_t wildcard_len = s2n_stuffer_data_available(&output_stuffer);
const char *expected_output = wildcardify_test_cases[i].output;
if (wildcard_len > 0) {
EXPECT_EQUAL(wildcard_len, strlen(expected_output));
EXPECT_SUCCESS(memcmp(output, expected_output, wildcard_len));
} else {
EXPECT_EQUAL(expected_output, NULL);
}
}
/* s2n_connection_get_certificate_match */
{
/* Safety checks */
{
s2n_cert_sni_match match_status = 0;
struct s2n_connection *conn = NULL;
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_certificate_match(NULL, &match_status),
S2N_ERR_INVALID_ARGUMENT);
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_certificate_match(conn, NULL),
S2N_ERR_INVALID_ARGUMENT);
/* This API does not work on a client connection */
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_certificate_match(client_conn, &match_status),
S2N_ERR_CLIENT_MODE);
/* This API will not work if a certificate isn't selected yet. */
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_certificate_match(server_conn, &match_status),
S2N_ERR_NO_CERT_FOUND);
}
const struct {
const char *cert_path;
const char *key_path;
const char *server_name;
s2n_cert_sni_match expected_match_status;
} test_cases[] = {
/* Client does not send an SNI extension */
{
.cert_path = S2N_DEFAULT_TEST_CERT_CHAIN,
.key_path = S2N_DEFAULT_TEST_PRIVATE_KEY,
.server_name = NULL,
.expected_match_status = S2N_SNI_NONE,
},
/* Server has a certificate that matches the client's SNI extension */
{
.cert_path = S2N_DEFAULT_TEST_CERT_CHAIN,
.key_path = S2N_DEFAULT_TEST_PRIVATE_KEY,
.server_name = "localhost",
.expected_match_status = S2N_SNI_EXACT_MATCH,
},
/* Server has a certificate with a domain name containing a wildcard character
* which can be matched to the client's SNI extension */
{
.cert_path = S2N_RSA_2048_SHA256_WILDCARD_CERT,
.key_path = S2N_RSA_2048_SHA256_WILDCARD_KEY,
.server_name = "alligator.localhost",
.expected_match_status = S2N_SNI_WILDCARD_MATCH,
},
/* Server does not have a certificate that can be matched to the client's
* SNI extension. */
{
.cert_path = S2N_DEFAULT_TEST_CERT_CHAIN,
.key_path = S2N_DEFAULT_TEST_PRIVATE_KEY,
.server_name = "This cert name is unlikely to exist.",
.expected_match_status = S2N_SNI_NO_MATCH,
},
};
for (size_t i = 0; i < s2n_array_len(test_cases); i++) {
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
DEFER_CLEANUP(struct s2n_cert_chain_and_key *chain_and_key = NULL,
s2n_cert_chain_and_key_ptr_free);
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key,
test_cases[i].cert_path, test_cases[i].key_path));
EXPECT_SUCCESS(s2n_config_disable_x509_verification(config));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config));
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_io_stuffer_pair_init(&io_pair));
EXPECT_OK(s2n_connections_set_io_stuffer_pair(server_conn, client_conn, &io_pair));
const char *server_name = test_cases[i].server_name;
if (server_name) {
EXPECT_SUCCESS(s2n_set_server_name(client_conn, server_name));
}
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
s2n_cert_sni_match match_status = 0;
EXPECT_SUCCESS(s2n_connection_get_certificate_match(server_conn, &match_status));
EXPECT_EQUAL(match_status, test_cases[i].expected_match_status);
}
/* Test that cert info can still be retrieved in the case of a failed handshake */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client_conn);
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server_conn);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
DEFER_CLEANUP(struct s2n_cert_chain_and_key *chain_and_key = NULL,
s2n_cert_chain_and_key_ptr_free);
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key,
S2N_DEFAULT_TEST_CERT_CHAIN, S2N_DEFAULT_TEST_PRIVATE_KEY));
EXPECT_SUCCESS(s2n_config_disable_x509_verification(config));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(client_conn, S2N_SELF_SERVICE_BLINDING));
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_io_stuffer_pair_init(&io_pair));
EXPECT_OK(s2n_connections_set_io_stuffer_pair(server_conn, client_conn, &io_pair));
EXPECT_SUCCESS(s2n_set_server_name(client_conn, "This cert name is unlikely to exist."));
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate_test_server_and_client(server_conn, client_conn),
S2N_ERR_CERT_UNTRUSTED);
s2n_cert_sni_match match_status = 0;
EXPECT_SUCCESS(s2n_connection_get_certificate_match(server_conn, &match_status));
EXPECT_EQUAL(match_status, S2N_SNI_NO_MATCH);
}
}
END_TEST();
}
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