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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 "tls/extensions/s2n_cert_authorities.h"
#include "crypto/s2n_libcrypto.h"
#include "crypto/s2n_rsa_pss.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_bitmap.h"
int s2n_parse_client_hello(struct s2n_connection *conn);
int main(int argc, char **argv)
{
BEGIN_TEST();
DEFER_CLEANUP(struct s2n_cert_chain_and_key *cert_chain = NULL,
s2n_cert_chain_and_key_ptr_free);
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&cert_chain,
S2N_DEFAULT_ECDSA_TEST_CERT_CHAIN, S2N_DEFAULT_ECDSA_TEST_PRIVATE_KEY));
s2n_extension_type_id temp_id = s2n_unsupported_extension;
EXPECT_SUCCESS(s2n_extension_supported_iana_value_to_id(
s2n_cert_authorities_extension.iana_value, &temp_id));
const s2n_extension_type_id ca_ext_id = temp_id;
/* Test: awslc should always support loading from the trust store */
if (s2n_libcrypto_is_awslc()) {
EXPECT_TRUE(s2n_cert_authorities_supported_from_trust_store());
}
/* Test: s2n_config_set_cert_authorities_from_trust_store */
{
/* Test: Safety */
{
EXPECT_FAILURE_WITH_ERRNO(
s2n_config_set_cert_authorities_from_trust_store(NULL),
S2N_ERR_NULL);
};
/* Test: fails if not supported */
{
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(),
s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_verification_ca_location(config,
S2N_ECDSA_P512_CERT_CHAIN, NULL));
if (s2n_cert_authorities_supported_from_trust_store()) {
EXPECT_SUCCESS(s2n_config_set_cert_authorities_from_trust_store(config));
EXPECT_NOT_EQUAL(config->cert_authorities.size, 0);
} else {
EXPECT_FAILURE_WITH_ERRNO(
s2n_config_set_cert_authorities_from_trust_store(config),
S2N_ERR_API_UNSUPPORTED_BY_LIBCRYPTO);
EXPECT_EQUAL(config->cert_authorities.size, 0);
}
};
/* Test: not allowed with system trust store */
{
/* s2n_config_new configures the default trust store */
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
/* Fails with default system trust store */
EXPECT_FAILURE_WITH_ERRNO(
s2n_config_set_cert_authorities_from_trust_store(config),
S2N_ERR_INVALID_STATE);
EXPECT_EQUAL(config->cert_authorities.size, 0);
/* Succeeds again after wiping trust store */
EXPECT_SUCCESS(s2n_config_wipe_trust_store(config));
EXPECT_SUCCESS(s2n_config_set_cert_authorities_from_trust_store(config));
EXPECT_EQUAL(config->cert_authorities.size, 0);
};
/* Test: empty trust store */
{
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_set_cert_authorities_from_trust_store(config));
EXPECT_EQUAL(config->cert_authorities.size, 0);
};
/* Test: too many CAs in trust store */
if (s2n_cert_authorities_supported_from_trust_store()) {
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
/* This is just a copy of the default trust store from an Amazon Linux instance */
EXPECT_SUCCESS(s2n_config_set_verification_ca_location(config, S2N_TEST_TRUST_STORE, NULL));
EXPECT_FAILURE_WITH_ERRNO(
s2n_config_set_cert_authorities_from_trust_store(config),
S2N_ERR_TOO_MANY_CAS);
EXPECT_EQUAL(config->cert_authorities.size, 0);
};
};
/* Test: s2n_certificate_authorities_extension.send */
{
/* Test: writes whatever CA data is available */
{
const uint8_t ca_data[] = "these are my CAs";
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(), s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_alloc(&config->cert_authorities, sizeof(ca_data)));
EXPECT_MEMCPY_SUCCESS(config->cert_authorities.data, ca_data, sizeof(ca_data));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
conn->actual_protocol_version = S2N_TLS13;
DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));
EXPECT_SUCCESS(s2n_cert_authorities_extension.send(conn, &output));
uint16_t size = 0;
EXPECT_SUCCESS(s2n_stuffer_read_uint16(&output, &size));
EXPECT_EQUAL(size, sizeof(ca_data));
EXPECT_EQUAL(size, s2n_stuffer_data_available(&output));
uint8_t *data = s2n_stuffer_raw_read(&output, size);
EXPECT_NOT_NULL(data);
EXPECT_BYTEARRAY_EQUAL(data, ca_data, sizeof(ca_data));
};
};
/* Test: s2n_certificate_authorities_extension.should_send */
{
/* Test: do not send for TLS1.2 */
{
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(), s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_alloc(&config->cert_authorities, 10));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));
conn->actual_protocol_version = S2N_TLS12;
EXPECT_SUCCESS(s2n_extension_send(&s2n_cert_authorities_extension,
conn, &output));
EXPECT_EQUAL(s2n_stuffer_data_available(&output), 0);
conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_extension_send(&s2n_cert_authorities_extension,
conn, &output));
EXPECT_NOT_EQUAL(s2n_stuffer_data_available(&output), 0);
};
/* Test: do not send if no CA data set */
{
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(), s2n_config_ptr_free);
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
EXPECT_FALSE(s2n_cert_authorities_extension.should_send(conn));
EXPECT_SUCCESS(s2n_alloc(&config->cert_authorities, 10));
EXPECT_TRUE(s2n_cert_authorities_extension.should_send(conn));
EXPECT_SUCCESS(s2n_free(&config->cert_authorities));
EXPECT_FALSE(s2n_cert_authorities_extension.should_send(conn));
};
};
/* Test: ClientHello extension ignored
*
*= https://www.rfc-editor.org/rfc/rfc8446#section-4.2.4
*= type=test
*# The client MAY send the "certificate_authorities" extension in the
*# ClientHello message.
*/
if (s2n_is_tls13_fully_supported()) {
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(), s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(config));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, cert_chain));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "default_tls13"));
EXPECT_SUCCESS(s2n_alloc(&config->cert_authorities, 10));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
EXPECT_SUCCESS(s2n_client_hello_send(client));
EXPECT_SUCCESS(s2n_parse_client_hello(client));
struct s2n_client_hello *client_hello = &client->client_hello;
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
struct s2n_stuffer *input = &server->handshake.io;
/* Copy ClientHello, except extensions */
size_t size_without_extensions = client_hello->raw_message.size
- client_hello->extensions.raw.size
- sizeof(uint16_t) /* Extensions size */;
EXPECT_SUCCESS(s2n_stuffer_write_bytes(input,
client_hello->raw_message.data, size_without_extensions));
/* Save space for new extensions size */
struct s2n_stuffer_reservation extensions_size = { 0 };
EXPECT_SUCCESS(s2n_stuffer_reserve_uint16(input, &extensions_size));
/* Write the certificate_authorities extension.
* The client isn't allowed to write it, so use the server.
*/
server->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_extension_send(&s2n_cert_authorities_extension,
server, input));
/* Write the rest of the extensions */
EXPECT_SUCCESS(s2n_stuffer_write(input, &client_hello->extensions.raw));
/* Update the extensions size */
EXPECT_SUCCESS(s2n_stuffer_write_vector_size(&extensions_size));
/* Server should be able to successfully receive the modified ClientHello */
EXPECT_SUCCESS(s2n_client_hello_recv(server));
EXPECT_TRUE(server->client_hello.parsed);
EXPECT_EQUAL(server->actual_protocol_version, S2N_TLS13);
s2n_parsed_extension *extension = &server->client_hello.extensions.parsed_extensions[ca_ext_id];
EXPECT_TRUE(extension->extension.size > 0);
EXPECT_FALSE(extension->processed);
EXPECT_EQUAL(extension->extension_type, s2n_cert_authorities_extension.iana_value);
};
/* Self-talk test: CertificateRequest extension parsed
*
*= https://www.rfc-editor.org/rfc/rfc8446#section-4.2.4
*= type=test
*# The server MAY send it in the CertificateRequest message.
**/
if (s2n_is_tls13_fully_supported()) {
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(), s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(config));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, cert_chain));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "default_tls13"));
EXPECT_SUCCESS(s2n_config_set_client_auth_type(config, S2N_CERT_AUTH_OPTIONAL));
EXPECT_SUCCESS(s2n_alloc(&config->cert_authorities, 10));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
DEFER_CLEANUP(struct s2n_test_io_pair io_pair = { 0 }, s2n_io_pair_close);
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
EXPECT_SUCCESS(s2n_connections_set_io_pair(client, server, &io_pair));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
EXPECT_EQUAL(server->actual_protocol_version, S2N_TLS13);
EXPECT_TRUE(IS_CLIENT_AUTH_HANDSHAKE(server));
/* Server sent extension */
EXPECT_TRUE(S2N_CBIT_TEST(server->extension_requests_sent, ca_ext_id));
EXPECT_FALSE(S2N_CBIT_TEST(server->extension_requests_received, ca_ext_id));
/* Client received extension */
EXPECT_FALSE(S2N_CBIT_TEST(client->extension_requests_sent, ca_ext_id));
EXPECT_TRUE(S2N_CBIT_TEST(client->extension_requests_received, ca_ext_id));
};
/* Known value test: compare our extension to openssl s_server */
if (s2n_is_rsa_pss_certs_supported() && s2n_cert_authorities_supported_from_trust_store()) {
/* clang-format off */
const struct {
const char *cert_name;
uint8_t expected_bytes_size;
uint8_t expected_bytes[1000];
} test_cases[] = {
{
.cert_name = S2N_RSA_PSS_2048_SHA256_LEAF_CERT,
.expected_bytes_size = 32,
.expected_bytes = {
0x00, 0x2f, 0x00, 0x1c, 0x00, 0x1a, 0x00, 0x18,
0x30, 0x16, 0x31, 0x14, 0x30, 0x12, 0x06, 0x03,
0x55, 0x04, 0x03, 0x0c, 0x0b, 0x65, 0x78, 0x61,
0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d
},
},
{
.cert_name = S2N_ECDSA_P512_CERT_CHAIN,
.expected_bytes_size = 107,
.expected_bytes = {
0x00, 0x2f, 0x00, 0x67, 0x00, 0x65, 0x00, 0x63,
0x30, 0x61, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03,
0x55, 0x04, 0x06, 0x13, 0x02, 0x55, 0x53, 0x31,
0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x08,
0x0c, 0x02, 0x57, 0x41, 0x31, 0x10, 0x30, 0x0e,
0x06, 0x03, 0x55, 0x04, 0x07, 0x0c, 0x07, 0x53,
0x65, 0x61, 0x74, 0x74, 0x6c, 0x65, 0x31, 0x0f,
0x30, 0x0d, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x0c,
0x06, 0x41, 0x6d, 0x61, 0x7a, 0x6f, 0x6e, 0x31,
0x0c, 0x30, 0x0a, 0x06, 0x03, 0x55, 0x04, 0x0b,
0x0c, 0x03, 0x73, 0x32, 0x6e, 0x31, 0x14, 0x30,
0x12, 0x06, 0x03, 0x55, 0x04, 0x03, 0x0c, 0x0b,
0x73, 0x32, 0x6e, 0x54, 0x65, 0x73, 0x74, 0x43,
0x65, 0x72, 0x74
},
},
{
.cert_name = S2N_RSA_2048_SHA256_URI_SANS_CERT,
.expected_bytes_size = 192,
.expected_bytes = {
0x00, 0x2f, 0x00, 0xbc, 0x00, 0xba, 0x00, 0x53,
0x30, 0x51, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03,
0x55, 0x04, 0x06, 0x13, 0x02, 0x55, 0x53, 0x31,
0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x08,
0x0c, 0x02, 0x57, 0x41, 0x31, 0x0f, 0x30, 0x0d,
0x06, 0x03, 0x55, 0x04, 0x0a, 0x0c, 0x06, 0x41,
0x6d, 0x61, 0x7a, 0x6f, 0x6e, 0x31, 0x0c, 0x30,
0x0a, 0x06, 0x03, 0x55, 0x04, 0x0b, 0x0c, 0x03,
0x73, 0x32, 0x6e, 0x31, 0x16, 0x30, 0x14, 0x06,
0x03, 0x55, 0x04, 0x03, 0x0c, 0x0d, 0x73, 0x32,
0x6e, 0x54, 0x65, 0x73, 0x74, 0x53, 0x65, 0x72,
0x76, 0x65, 0x72, 0x00, 0x63, 0x30, 0x61, 0x31,
0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06,
0x13, 0x02, 0x55, 0x53, 0x31, 0x0b, 0x30, 0x09,
0x06, 0x03, 0x55, 0x04, 0x08, 0x0c, 0x02, 0x57,
0x41, 0x31, 0x10, 0x30, 0x0e, 0x06, 0x03, 0x55,
0x04, 0x07, 0x0c, 0x07, 0x53, 0x65, 0x61, 0x74,
0x74, 0x6c, 0x65, 0x31, 0x0f, 0x30, 0x0d, 0x06,
0x03, 0x55, 0x04, 0x0a, 0x0c, 0x06, 0x41, 0x6d,
0x61, 0x7a, 0x6f, 0x6e, 0x31, 0x0c, 0x30, 0x0a,
0x06, 0x03, 0x55, 0x04, 0x0b, 0x0c, 0x03, 0x73,
0x32, 0x6e, 0x31, 0x14, 0x30, 0x12, 0x06, 0x03,
0x55, 0x04, 0x03, 0x0c, 0x0b, 0x73, 0x32, 0x6e,
0x54, 0x65, 0x73, 0x74, 0x52, 0x6f, 0x6f, 0x74
},
},
{
.cert_name = S2N_RSA_2048_PKCS1_CERT_CHAIN,
.expected_bytes_size = 94,
.expected_bytes = {
0x00, 0x2f, 0x00, 0x5a, 0x00, 0x58, 0x00, 0x1a,
0x30, 0x18, 0x31, 0x16, 0x30, 0x14, 0x06, 0x03,
0x55, 0x04, 0x03, 0x0c, 0x0d, 0x73, 0x32, 0x6e,
0x54, 0x65, 0x73, 0x74, 0x53, 0x65, 0x72, 0x76,
0x65, 0x72, 0x00, 0x20, 0x30, 0x1e, 0x31, 0x1c,
0x30, 0x1a, 0x06, 0x03, 0x55, 0x04, 0x03, 0x0c,
0x13, 0x73, 0x32, 0x6e, 0x54, 0x65, 0x73, 0x74,
0x49, 0x6e, 0x74, 0x65, 0x72, 0x6d, 0x65, 0x64,
0x69, 0x61, 0x74, 0x65, 0x00, 0x18, 0x30, 0x16,
0x31, 0x14, 0x30, 0x12, 0x06, 0x03, 0x55, 0x04,
0x03, 0x0c, 0x0b, 0x73, 0x32, 0x6e, 0x54, 0x65,
0x73, 0x74, 0x52, 0x6f, 0x6f, 0x74
},
},
};
/* clang-format on */
for (size_t i = 0; i < s2n_array_len(test_cases); i++) {
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(),
s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_verification_ca_location(config,
test_cases[i].cert_name, NULL));
EXPECT_SUCCESS(s2n_config_set_cert_authorities_from_trust_store(config));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
conn->actual_protocol_version = S2N_TLS13;
DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));
EXPECT_SUCCESS(s2n_extension_send(&s2n_cert_authorities_extension,
conn, &output));
size_t output_size = s2n_stuffer_data_available(&output);
EXPECT_EQUAL(test_cases[i].expected_bytes_size, output_size);
uint8_t *output_bytes = s2n_stuffer_raw_read(&output, output_size);
EXPECT_NOT_NULL(output_bytes);
EXPECT_BYTEARRAY_EQUAL(test_cases[i].expected_bytes, output_bytes, output_size);
}
};
END_TEST();
}
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