test_ssl.c

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/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 * Copyright (C) 2023 OpenVPN Inc <sales@openvpn.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "syshead.h"
 
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <setjmp.h>
#include <cmocka.h>
 
#include "crypto.h"
#include "options.h"
#include "ssl_backend.h"
#include "options_util.h"
 
#include "mock_msg.h"
#include "mss.h"
#include "ssl_verify_backend.h"
#include "win32.h"
#include "test_common.h"
 
/* Mock function to be allowed to include win32.c which is required for
 * getting the temp directory */
#ifdef _WIN32
struct signal_info siginfo_static; /* GLOBAL */
 
const char *
strerror_win32(DWORD errnum, struct gc_arena *gc)
{
    ASSERT(false);
}
 
void
throw_signal(const int signum)
{
    ASSERT(false);
}
#endif
 
 
const char *unittest_cert = "-----BEGIN CERTIFICATE-----\n"
                            "MIIBuTCCAUCgAwIBAgIUTLtjSBzx53qZRvZ6Ur7D9kgoOHkwCgYIKoZIzj0EAwIw\n"
                            "EzERMA8GA1UEAwwIdW5pdHRlc3QwIBcNMjMxMTIxMDk1NDQ3WhgPMjA3ODA4MjQw\n"
                            "OTU0NDdaMBMxETAPBgNVBAMMCHVuaXR0ZXN0MHYwEAYHKoZIzj0CAQYFK4EEACID\n"
                            "YgAEHYB2hn2xx3f4lClXDtdi36P19pMZA+kI1Dkv/Vn10vBZ/j9oa+P99T8duz/e\n"
                            "QlPeHpesNJO4fX8iEDj6+vMeWejOT7jAQ4MmG5EZjpcBKxCfwFooEvzu8bVujUcu\n"
                            "wTQEo1MwUTAdBgNVHQ4EFgQUPcgBEVXjF5vYfDsInoE3dF6UfQswHwYDVR0jBBgw\n"
                            "FoAUPcgBEVXjF5vYfDsInoE3dF6UfQswDwYDVR0TAQH/BAUwAwEB/zAKBggqhkjO\n"
                            "PQQDAgNnADBkAjBLPAGrQAyinigqiu0RomoV8TVaknVLFSq6H6A8jgvzfsFCUK1O\n"
                            "dvNZhFPM6idKB+oCME2JLOBANCSV8o7aJzq7SYHKwPyb1J4JFlwKe/0Jpv7oh9b1\n"
                            "IJbuaM9Z/VSKbrIXGg==\n"
                            "-----END CERTIFICATE-----\n";
 
static const char *
get_tmp_dir()
{
    const char *ret;
#ifdef _WIN32
    ret = win_get_tempdir();
#else
    ret = "/tmp";
#endif
    assert_non_null(ret);
    return ret;
}
 
static void
crypto_pem_encode_certificate(void **state)
{
    struct gc_arena gc = gc_new();
 
    struct tls_root_ctx ctx = { 0 };
    tls_ctx_client_new(&ctx);
    tls_ctx_load_cert_file(&ctx, unittest_cert, true);
 
    openvpn_x509_cert_t *cert = NULL;
 
    /* we do not have methods to fetch certificates from ssl contexts, use
     * internal TLS library methods for the unit test */
#ifdef ENABLE_CRYPTO_OPENSSL
    cert = SSL_CTX_get0_certificate(ctx.ctx);
#elif defined(ENABLE_CRYPTO_MBEDTLS)
    cert = ctx.crt_chain;
#endif
 
    const char *tmpfile = platform_create_temp_file(get_tmp_dir(), "ut_pem", &gc);
    backend_x509_write_pem(cert, tmpfile);
 
    struct buffer exported_pem = buffer_read_from_file(tmpfile, &gc);
    assert_string_equal(BSTR(&exported_pem), unittest_cert);
 
    tls_ctx_free(&ctx);
    unlink(tmpfile);
    gc_free(&gc);
}
 
int
main(void)
{
    openvpn_unit_test_setup();
 
    const struct CMUnitTest tests[] = {
        cmocka_unit_test(crypto_pem_encode_certificate)
    };
 
#if defined(ENABLE_CRYPTO_OPENSSL)
    tls_init_lib();
#endif
 
    int ret = cmocka_run_group_tests_name("crypto tests", tests, NULL, NULL);
 
#if defined(ENABLE_CRYPTO_OPENSSL)
    tls_free_lib();
#endif
 
    return ret;
}