/*-

 * Copyright (c) 2003-2007,2016 Tim Kientzle

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "test.h"

__FBSDID("$FreeBSD$");

#define UMASK 022

/*

 * Github Issue #745 describes a bug in the sandboxing code that

 * allows one to use a symlink to edit the permissions on a file or

 * directory outside of the sandbox.

 */

DEFINE_TEST(test_write_disk_secure745)

{

#if defined(_WIN32) && !defined(__CYGWIN__)

	skipping("archive_write_disk security checks not supported on Windows");

#else

	struct archive *a;

	struct archive_entry *ae;

	/* Start with a known umask. */

	assertUmask(UMASK);

	/* Create an archive_write_disk object. */

	assert((a = archive_write_disk_new()) != NULL);

	archive_write_disk_set_options(a, ARCHIVE_EXTRACT_SECURE_SYMLINKS);

	/* The target dir:  The one we're going to try to change permission on */

	assertMakeDir("target", 0700);

	/* The sandbox dir we're going to run inside of. */

	assertMakeDir("sandbox", 0700);

	assertChdir("sandbox");

	/* Create a symlink pointing to the target directory */

	assert((ae = archive_entry_new()) != NULL);

	archive_entry_copy_pathname(ae, "sym");

	archive_entry_set_mode(ae, AE_IFLNK | 0777);

	archive_entry_copy_symlink(ae, "../target");

	assert(0 == archive_write_header(a, ae));

	archive_entry_free(ae);

	/* Try to alter the target dir through the symlink; this should fail. */

	assert((ae = archive_entry_new()) != NULL);

	archive_entry_copy_pathname(ae, "sym");

	archive_entry_set_mode(ae, S_IFDIR | 0777);

	assert(0 == archive_write_header(a, ae));

	archive_entry_free(ae);

	/* Permission of target dir should not have changed. */

	assertFileMode("../target", 0700);

	assert(0 == archive_write_close(a));

	archive_write_free(a);

#endif

}