/*
 * Copyright (C) 2008-2014 Free Software Foundation, Inc.
 *
 * Author: Simon Josefsson, Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * GnuTLS is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * GnuTLS 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 GnuTLS.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <gnutls/gnutls.h>
#include <gnutls/x509.h>

#include "../utils.h"
#include "softhsm.h"
#include "../test-chains.h"

#define CONFIG "softhsm-chainverify.config"

#define DEFAULT_THEN 1256803113
static time_t then = DEFAULT_THEN;

/* GnuTLS internally calls time() to find out the current time when
   verifying certificates.  To avoid a time bomb, we hard code the
   current time.  This should work fine on systems where the library
   call to time is resolved at run-time.  */
static time_t mytime(time_t *t)
{
	if (t)
		*t = then;

	return then;
}

static void tls_log_func(int level, const char *str)
{
	fprintf(stderr, "|<%d>| %s", level, str);
}

static int pin_func(void *userdata, int attempt, const char *url,
		    const char *label, unsigned flags, char *pin,
		    size_t pin_max)
{
	if (attempt == 0) {
		strcpy(pin, "1234");
		return 0;
	}
	return -1;
}

void doit(void)
{
	int exit_val = 0;
	size_t i;
	int ret;
	const char *lib, *bin;
	gnutls_typed_vdata_st vdata[2];
	char buf[128];

	if (gnutls_fips140_mode_enabled())
		exit(77);

	/* The overloading of time() seems to work in linux (ELF?)
	 * systems only. Disable it on windows.
	 */
#ifdef _WIN32
	exit(77);
#endif

	bin = softhsm_bin();

	lib = softhsm_lib();

	ret = global_init();
	if (ret != 0) {
		fail("%d: %s\n", ret, gnutls_strerror(ret));
		exit(1);
	}

	gnutls_pkcs11_set_pin_function(pin_func, NULL);
	gnutls_global_set_time_function(mytime);
	gnutls_global_set_log_function(tls_log_func);
	if (debug)
		gnutls_global_set_log_level(4711);

	set_softhsm_conf(CONFIG);
	snprintf(
		buf, sizeof(buf),
		"%s --init-token --slot 0 --label test --so-pin 1234 --pin 1234",
		bin);
	system(buf);

	ret = gnutls_pkcs11_add_provider(lib, "trusted");
	if (ret < 0) {
		fprintf(stderr, "gnutls_x509_crt_init: %s\n",
			gnutls_strerror(ret));
		exit(1);
	}

	for (i = 0; chains[i].chain; i++) {
		gnutls_x509_trust_list_t tl;
		unsigned int verify_status;
		gnutls_x509_crt_t certs[MAX_CHAIN];
		gnutls_x509_crt_t ca;
		gnutls_datum_t tmp;
		size_t j;

		gnutls_x509_trust_list_iter_t get_ca_iter;
		gnutls_datum_t get_ca_datum_test;
		gnutls_datum_t get_ca_datum;
		gnutls_x509_crt_t get_ca_crt;

		if (debug)
			printf("Chain '%s' (%d)...\n", chains[i].name, (int)i);

		if (chains[i].notfips && gnutls_fips140_mode_enabled()) {
			if (debug)
				printf("Skipping in FIPS mode...\n");
			continue;
		}

		for (j = 0; chains[i].chain[j]; j++) {
			if (debug > 2)
				printf("\tAdding certificate %d...", (int)j);

			ret = gnutls_x509_crt_init(&certs[j]);
			if (ret < 0) {
				fprintf(stderr,
					"gnutls_x509_crt_init[%d,%d]: %s\n",
					(int)i, (int)j, gnutls_strerror(ret));
				exit(1);
			}

			tmp.data = (unsigned char *)chains[i].chain[j];
			tmp.size = strlen(chains[i].chain[j]);

			ret = gnutls_x509_crt_import(certs[j], &tmp,
						     GNUTLS_X509_FMT_PEM);
			if (debug > 2)
				printf("done\n");
			if (ret < 0) {
				fprintf(stderr,
					"gnutls_x509_crt_import[%s,%d]: %s\n",
					chains[i].name, (int)j,
					gnutls_strerror(ret));
				exit(1);
			}

			gnutls_x509_crt_print(certs[j],
					      GNUTLS_CRT_PRINT_ONELINE, &tmp);
			if (debug)
				printf("\tCertificate %d: %.*s\n", (int)j,
				       tmp.size, tmp.data);
			gnutls_free(tmp.data);
		}

		if (debug > 2)
			printf("\tAdding CA certificate...");

		ret = gnutls_x509_crt_init(&ca);
		if (ret < 0) {
			fprintf(stderr, "gnutls_x509_crt_init: %s\n",
				gnutls_strerror(ret));
			exit(1);
		}

		tmp.data = (unsigned char *)*chains[i].ca;
		tmp.size = strlen(*chains[i].ca);

		ret = gnutls_x509_crt_import(ca, &tmp, GNUTLS_X509_FMT_PEM);
		if (ret < 0) {
			fprintf(stderr, "gnutls_x509_crt_import: %s\n",
				gnutls_strerror(ret));
			exit(1);
		}

		if (debug > 2)
			printf("done\n");

		gnutls_x509_crt_print(ca, GNUTLS_CRT_PRINT_ONELINE, &tmp);
		if (debug)
			printf("\tCA Certificate: %.*s\n", tmp.size, tmp.data);
		gnutls_free(tmp.data);

		if (debug)
			printf("\tVerifying...");

		/* initialize softhsm token */
		ret = gnutls_pkcs11_token_init(SOFTHSM_URL, "1234", "test");
		if (ret < 0) {
			fail("gnutls_pkcs11_token_init\n");
			exit(1);
		}

		/* write CA certificate to softhsm */
		ret = gnutls_pkcs11_copy_x509_crt(
			SOFTHSM_URL, ca, "test-ca",
			GNUTLS_PKCS11_OBJ_FLAG_MARK_TRUSTED |
				GNUTLS_PKCS11_OBJ_FLAG_MARK_CA |
				GNUTLS_PKCS11_OBJ_FLAG_LOGIN_SO);
		if (ret < 0) {
			fail("gnutls_pkcs11_copy_x509_crt: %s\n",
			     gnutls_strerror(ret));
		}

		gnutls_x509_trust_list_init(&tl, 0);

		ret = gnutls_x509_trust_list_add_trust_file(tl, SOFTHSM_URL,
							    NULL, 0, 0, 0);
		if (ret < 0) {
			fail("gnutls_x509_trust_list_add_trust_file: %s\n",
			     gnutls_strerror(ret));
			exit(1);
		}

		if (ret < 1) {
			fail("gnutls_x509_trust_list_add_trust_file returned zero!\n");
			exit(1);
		}

		/* test trust list iteration */
		get_ca_iter = NULL;
		while (gnutls_x509_trust_list_iter_get_ca(tl, &get_ca_iter,
							  &get_ca_crt) == 0) {
			ret = gnutls_x509_crt_export2(get_ca_crt,
						      GNUTLS_X509_FMT_PEM,
						      &get_ca_datum_test);
			if (ret < 0) {
				fail("gnutls_x509_crt_export2: %s\n",
				     gnutls_strerror(ret));
				exit(1);
			}

			ret = gnutls_x509_crt_export2(ca, GNUTLS_X509_FMT_PEM,
						      &get_ca_datum);
			if (ret < 0) {
				fail("gnutls_x509_crt_export2: %s\n",
				     gnutls_strerror(ret));
				exit(1);
			}

			if (get_ca_datum_test.size != get_ca_datum.size ||
			    memcmp(get_ca_datum_test.data, get_ca_datum.data,
				   get_ca_datum.size) != 0) {
				fail("gnutls_x509_trist_list_iter_get_ca: Unexpected certificate (%u != %u):\n\n%s\n\nvs.\n\n%s",
				     get_ca_datum.size, get_ca_datum_test.size,
				     get_ca_datum.data, get_ca_datum_test.data);
				exit(1);
			}

			gnutls_free(get_ca_datum.data);
			gnutls_free(get_ca_datum_test.data);
			gnutls_x509_crt_deinit(get_ca_crt);
		}

		vdata[0].type = GNUTLS_DT_KEY_PURPOSE_OID;
		vdata[0].data = (void *)chains[i].purpose;

		if (chains[i].expected_time != 0)
			then = chains[i].expected_time;
		else
			then = DEFAULT_THEN;

		/* make sure that the two functions don't diverge */
		ret = gnutls_x509_trust_list_verify_crt2(
			tl, certs, j, vdata, chains[i].purpose == NULL ? 0 : 1,
			chains[i].verify_flags, &verify_status, NULL);
		if (ret < 0) {
			fprintf(stderr,
				"gnutls_x509_crt_list_verify[%d,%d]: %s\n",
				(int)i, (int)j, gnutls_strerror(ret));
			exit(1);
		}

		if (verify_status != chains[i].expected_verify_result) {
			gnutls_datum_t out1, out2;
			gnutls_certificate_verification_status_print(
				verify_status, GNUTLS_CRT_X509, &out1, 0);
			gnutls_certificate_verification_status_print(
				chains[i].expected_verify_result,
				GNUTLS_CRT_X509, &out2, 0);
			fail("chain[%s]:\nverify_status: %d: %s\nexpected: %d: %s\n",
			     chains[i].name, verify_status, out1.data,
			     chains[i].expected_verify_result, out2.data);
			gnutls_free(out1.data);
			gnutls_free(out2.data);

#if 0
			j = 0;
			do {
				fprintf(stderr, "%s\n", chains[i].chain[j]);
			}
			while (chains[i].chain[++j] != NULL);
#endif

			if (!debug)
				exit(1);
		} else if (debug)
			printf("done\n");

		if (debug)
			printf("\tCleanup...");

		gnutls_x509_trust_list_deinit(tl, 0);
		gnutls_x509_crt_deinit(ca);
		for (j = 0; chains[i].chain[j]; j++)
			gnutls_x509_crt_deinit(certs[j]);

		if (debug)
			printf("done\n\n\n");
	}

	gnutls_global_deinit();

	if (debug)
		printf("Exit status...%d\n", exit_val);
	remove(CONFIG);

	exit(exit_val);
}
