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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 <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include "api/s2n.h"
#include "crypto/s2n_fips.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_cipher_preferences.h"
#include "tls/s2n_cipher_suites.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_handshake.h"
#include "tls/s2n_tls13.h"
#include "utils/s2n_safety.h"
/* To get access to the static functions / variables we need to test */
#include "tls/s2n_handshake_io.c"
#include "tls/s2n_tls13_handshake.c"
int s2n_test_client_auth_negotiation(struct s2n_config *server_config, struct s2n_config *client_config, struct s2n_cert_chain_and_key *ecdsa_cert, bool no_cert)
{
/* Set up client and server connections */
struct s2n_connection *client_conn;
struct s2n_connection *server_conn;
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, client_config));
client_conn->x509_validator.skip_cert_validation = 1;
client_conn->server_protocol_version = S2N_TLS13;
client_conn->client_protocol_version = S2N_TLS13;
client_conn->actual_protocol_version = S2N_TLS13;
client_conn->handshake_params.server_cert_sig_scheme = &s2n_ecdsa_secp256r1_sha256;
client_conn->handshake_params.client_cert_sig_scheme = &s2n_ecdsa_secp256r1_sha256;
client_conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
if (!no_cert) {
client_conn->handshake_params.our_chain_and_key = ecdsa_cert;
}
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, server_config));
server_conn->server_protocol_version = S2N_TLS13;
server_conn->client_protocol_version = S2N_TLS13;
server_conn->actual_protocol_version = S2N_TLS13;
server_conn->handshake_params.server_cert_sig_scheme = &s2n_ecdsa_secp256r1_sha256;
server_conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
if (no_cert) {
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(server_conn, S2N_CERT_AUTH_OPTIONAL));
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(client_conn, S2N_CERT_AUTH_OPTIONAL));
} else {
server_conn->x509_validator.skip_cert_validation = 1;
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(server_conn, S2N_CERT_AUTH_REQUIRED));
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(client_conn, S2N_CERT_AUTH_REQUIRED));
}
/* Create nonblocking pipes */
struct s2n_test_io_pair io_pair;
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
EXPECT_SUCCESS(s2n_connections_set_io_pair(client_conn, server_conn, &io_pair));
/* Negotiate handshake */
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_TRUE(IS_CLIENT_AUTH_HANDSHAKE(server_conn));
EXPECT_TRUE(IS_CLIENT_AUTH_HANDSHAKE(client_conn));
EXPECT_EQUAL(IS_CLIENT_AUTH_NO_CERT(server_conn), no_cert);
EXPECT_EQUAL(IS_CLIENT_AUTH_NO_CERT(client_conn), no_cert);
const char *app_data_str = "APPLICATION_DATA";
EXPECT_EQUAL(strcmp(app_data_str, s2n_connection_get_last_message_name(client_conn)), 0);
/* Clean up */
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_io_pair_close(&io_pair));
return 0;
}
/* Test to verify the explicit ordering of client_auth handshake with and without a client
* certificate. This includes some pre and post condition checks that pertain to client
* authentication between messages.
*/
int s2n_test_client_auth_message_by_message(bool no_cert)
{
struct s2n_connection *client_conn;
struct s2n_connection *server_conn;
struct s2n_config *server_config, *client_config;
EXPECT_NOT_NULL(server_config = s2n_config_new());
EXPECT_NOT_NULL(client_config = s2n_config_new());
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(client_config));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(server_config, "20190801"));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(client_config, "20190801"));
char *cert_chain = NULL;
char *private_key = NULL;
EXPECT_NOT_NULL(cert_chain = malloc(S2N_MAX_TEST_PEM_SIZE));
EXPECT_NOT_NULL(private_key = malloc(S2N_MAX_TEST_PEM_SIZE));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_ECDSA_P384_PKCS1_CERT_CHAIN, cert_chain, S2N_MAX_TEST_PEM_SIZE));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_ECDSA_P384_PKCS1_KEY, private_key, S2N_MAX_TEST_PEM_SIZE));
struct s2n_cert_chain_and_key *default_cert;
EXPECT_NOT_NULL(default_cert = s2n_cert_chain_and_key_new());
EXPECT_SUCCESS(s2n_cert_chain_and_key_load_pem(default_cert, cert_chain, private_key));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(server_config, default_cert));
if (!no_cert) {
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(client_config, default_cert));
}
EXPECT_NOT_NULL(client_conn = s2n_connection_new(S2N_CLIENT));
EXPECT_NOT_NULL(server_conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, server_config));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, client_config));
if (no_cert) {
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(server_conn, S2N_CERT_AUTH_OPTIONAL));
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(client_conn, S2N_CERT_AUTH_OPTIONAL));
} else {
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(server_conn, S2N_CERT_AUTH_REQUIRED));
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(client_conn, S2N_CERT_AUTH_REQUIRED));
client_conn->x509_validator.skip_cert_validation = 1;
server_conn->x509_validator.skip_cert_validation = 1;
}
struct s2n_stuffer client_to_server = { 0 };
struct s2n_stuffer server_to_client = { 0 };
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&client_to_server, 0));
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&server_to_client, 0));
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(&server_to_client, &client_to_server, client_conn));
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(&client_to_server, &server_to_client, server_conn));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client_conn, "default_tls13"));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server_conn, "default_tls13"));
/* Client sends ClientHello */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), CLIENT_HELLO);
EXPECT_SUCCESS(s2n_handshake_write_io(client_conn));
EXPECT_EQUAL(client_conn->actual_protocol_version, S2N_TLS13);
EXPECT_EQUAL(server_conn->actual_protocol_version, 0);
EXPECT_EQUAL(server_conn->handshake.handshake_type, INITIAL);
/* Server reads ClientHello */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), CLIENT_HELLO);
EXPECT_SUCCESS(s2n_handshake_read_io(server_conn));
EXPECT_EQUAL(server_conn->actual_protocol_version, S2N_TLS13); /* Server is now on TLS13 */
EXPECT_EQUAL(server_conn->handshake.handshake_type, NEGOTIATED | FULL_HANDSHAKE | CLIENT_AUTH | MIDDLEBOX_COMPAT);
EXPECT_SUCCESS(s2n_conn_set_handshake_type(server_conn));
/* Server sends ServerHello */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), SERVER_HELLO);
EXPECT_SUCCESS(s2n_handshake_write_io(server_conn));
/* Server sends CCS */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), SERVER_CHANGE_CIPHER_SPEC);
EXPECT_SUCCESS(s2n_handshake_write_io(server_conn));
/* Server sends EncryptedExtensions */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), ENCRYPTED_EXTENSIONS);
EXPECT_SUCCESS(s2n_handshake_write_io(server_conn));
/* Server sends CertificateRequest */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), SERVER_CERT_REQ);
EXPECT_SUCCESS(s2n_handshake_write_io(server_conn));
/* Server sends ServerCert */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), SERVER_CERT);
EXPECT_SUCCESS(s2n_handshake_write_io(server_conn));
/* Server sends CertVerify */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), SERVER_CERT_VERIFY);
EXPECT_SUCCESS(s2n_handshake_write_io(server_conn));
/* Server sends ServerFinished */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), SERVER_FINISHED);
EXPECT_SUCCESS(s2n_handshake_write_io(server_conn));
/* Client reads ServerHello */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), SERVER_HELLO);
EXPECT_SUCCESS(s2n_handshake_read_io(client_conn));
/* Client reads CCS
* The CCS message does not affect its place in the state machine. */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), ENCRYPTED_EXTENSIONS);
EXPECT_SUCCESS(s2n_handshake_read_io(client_conn));
/* Client reads EncryptedExtensions */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), ENCRYPTED_EXTENSIONS);
EXPECT_SUCCESS(s2n_handshake_read_io(client_conn));
if (no_cert) {
/* Client reads CertificateRequest but expects Cert */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), SERVER_CERT);
} else {
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), SERVER_CERT_REQ);
}
EXPECT_SUCCESS(s2n_handshake_read_io(client_conn));
EXPECT_EQUAL(client_conn->handshake.handshake_type, NEGOTIATED | FULL_HANDSHAKE | CLIENT_AUTH | MIDDLEBOX_COMPAT);
/* Client reads ServerCert */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), SERVER_CERT);
EXPECT_SUCCESS(s2n_handshake_read_io(client_conn));
/* Client reads CertVerify */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), SERVER_CERT_VERIFY);
EXPECT_SUCCESS(s2n_handshake_read_io(client_conn));
/* Client reads ServerFinished */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), SERVER_FINISHED);
EXPECT_SUCCESS(s2n_handshake_read_io(client_conn));
/* Client sends CCS */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), CLIENT_CHANGE_CIPHER_SPEC);
EXPECT_SUCCESS(s2n_handshake_write_io(client_conn));
/* Client sends ClientCert */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), CLIENT_CERT);
EXPECT_SUCCESS(s2n_handshake_write_io(client_conn));
if (no_cert) {
EXPECT_EQUAL(client_conn->handshake.handshake_type, NEGOTIATED | FULL_HANDSHAKE | CLIENT_AUTH | NO_CLIENT_CERT | MIDDLEBOX_COMPAT);
} else {
EXPECT_EQUAL(client_conn->handshake.handshake_type, NEGOTIATED | FULL_HANDSHAKE | CLIENT_AUTH | MIDDLEBOX_COMPAT);
/* Client sends CertVerify */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), CLIENT_CERT_VERIFY);
EXPECT_SUCCESS(s2n_handshake_write_io(client_conn));
}
/* Client sends ClientFinished */
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), CLIENT_FINISHED);
EXPECT_SUCCESS(s2n_handshake_write_io(client_conn));
/* Server reads CCS
* The CCS message does not affect its place in the state machine. */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), CLIENT_CERT);
EXPECT_SUCCESS(s2n_handshake_read_io(server_conn));
/* Server reads ClientCert */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), CLIENT_CERT);
EXPECT_SUCCESS(s2n_handshake_read_io(server_conn));
if (no_cert) {
EXPECT_EQUAL(server_conn->handshake.handshake_type, NEGOTIATED | FULL_HANDSHAKE | CLIENT_AUTH | NO_CLIENT_CERT | MIDDLEBOX_COMPAT);
} else {
EXPECT_EQUAL(server_conn->handshake.handshake_type, NEGOTIATED | FULL_HANDSHAKE | CLIENT_AUTH | MIDDLEBOX_COMPAT);
/* Server reads CertVerify */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), CLIENT_CERT_VERIFY);
EXPECT_SUCCESS(s2n_handshake_read_io(server_conn));
}
/* Server reads ClientFinished */
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), CLIENT_FINISHED);
EXPECT_SUCCESS(s2n_handshake_read_io(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
/* Clean up */
EXPECT_SUCCESS(s2n_stuffer_free(&client_to_server));
EXPECT_SUCCESS(s2n_stuffer_free(&server_to_client));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(default_cert));
EXPECT_SUCCESS(s2n_config_free(server_config));
EXPECT_SUCCESS(s2n_config_free(client_config));
free(private_key);
free(cert_chain);
return 0;
}
int main(int argc, char **argv)
{
BEGIN_TEST();
if (!s2n_is_tls13_fully_supported()) {
END_TEST();
}
EXPECT_SUCCESS(s2n_enable_tls13_in_test());
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));
/* client_auth handshake negotiation */
{
struct s2n_config *server_config, *client_config;
uint8_t *cert_chain_pem = NULL;
uint8_t *private_key_pem = NULL;
uint32_t cert_chain_len = 0;
uint32_t private_key_len = 0;
struct s2n_cert_chain_and_key *ecdsa_cert;
EXPECT_NOT_NULL(cert_chain_pem = malloc(S2N_MAX_TEST_PEM_SIZE));
EXPECT_NOT_NULL(private_key_pem = malloc(S2N_MAX_TEST_PEM_SIZE));
EXPECT_NOT_NULL(server_config = s2n_config_new());
EXPECT_NOT_NULL(client_config = s2n_config_new());
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(server_config, "20190801"));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(client_config, "20190801"));
EXPECT_SUCCESS(s2n_read_test_pem_and_len(S2N_ECDSA_P384_PKCS1_CERT_CHAIN, cert_chain_pem, &cert_chain_len, S2N_MAX_TEST_PEM_SIZE));
EXPECT_SUCCESS(s2n_read_test_pem_and_len(S2N_ECDSA_P384_PKCS1_KEY, private_key_pem, &private_key_len, S2N_MAX_TEST_PEM_SIZE));
EXPECT_NOT_NULL(ecdsa_cert = s2n_cert_chain_and_key_new());
EXPECT_SUCCESS(s2n_cert_chain_and_key_load_pem_bytes(ecdsa_cert, cert_chain_pem, cert_chain_len, private_key_pem, private_key_len));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(server_config, ecdsa_cert));
EXPECT_SUCCESS(s2n_config_set_verification_ca_location(client_config, S2N_ECDSA_P384_PKCS1_CERT_CHAIN, NULL));
/* client_auth with no cert */
EXPECT_SUCCESS(s2n_test_client_auth_negotiation(server_config, client_config, ecdsa_cert, 1));
/* client_auth with cert */
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(client_config, ecdsa_cert));
EXPECT_SUCCESS(s2n_test_client_auth_negotiation(server_config, client_config, ecdsa_cert, 0));
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(ecdsa_cert));
EXPECT_SUCCESS(s2n_config_free(server_config));
EXPECT_SUCCESS(s2n_config_free(client_config));
free(cert_chain_pem);
free(private_key_pem);
};
/* Test each message is sent and in the correct order */
{
/* Test messsage by message with no cert */
s2n_test_client_auth_message_by_message(1);
/* Test message by message with a cert */
s2n_test_client_auth_message_by_message(0);
};
/* Test unexpected certificate request */
{
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client);
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server);
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
/* Enable client auth on the server, but not on the client */
EXPECT_SUCCESS(s2n_connection_set_client_auth_type(server, S2N_CERT_AUTH_OPTIONAL));
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_FAILURE_WITH_ERRNO(s2n_negotiate_test_server_and_client(server, client),
S2N_ERR_UNEXPECTED_CERT_REQUEST);
};
END_TEST();
}
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