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/*-
* Copyright (c) 2006 nCircle Network Security, Inc.
* Copyright (c) 2007 Robert N. M. Watson
* All rights reserved.
*
* This software was developed by Robert N. M. Watson for the TrustedBSD
* Project under contract to nCircle Network Security, Inc.
*
* 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 AND CONTRIBUTORS ``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, NCIRCLE NETWORK SECURITY,
* INC., OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
/*
* Confirm that a generation number isn't returned by stat() when not running
* with privilege. In order to differentiate between a generation of 0 and
* a generation not being returned, we have to create a temporary file known
* to have a non-0 generation. We try up to MAX_TRIES times, and then give
* up, which is non-ideal, but better than not testing for a problem.
*/
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "main.h"
static char fpath[1024];
static int fpath_initialized;
#define MAX_TRIES 100
int
priv_vfs_generation_setup(int asroot, int injail, struct test *test)
{
struct stat sb;
int i;
/*
* The kernel zeros the generation number field when an unprivileged
* user stats a file. In order to distinguish the two cases, we
* therefore require a file that we know has a non-zero generation
* number. We try up to MAX_TRIES times and otherwise fail.
*/
for (i = 0; i < MAX_TRIES; i++) {
setup_file("priv_vfs_generation_setup: fpath", fpath,
UID_ROOT, GID_WHEEL, 0644);
if (stat(fpath, &sb) < 0) {
warn("priv_vfs_generation_setup: fstat(%s)", fpath);
(void)unlink(fpath);
return (-1);
}
if (sb.st_gen != 0) {
fpath_initialized = 1;
return (0);
}
}
warnx("priv_vfs_generation_setup: unable to create gen file");
return (-1);
}
void
priv_vfs_generation(int asroot, int injail, struct test *test)
{
struct stat sb;
int error;
error = stat(fpath, &sb);
if (error < 0)
warn("priv_vfs_generation(asroot, injail) stat");
if (sb.st_gen == 0) {
error = -1;
errno = EPERM;
} else
error = 0;
if (asroot && injail)
expect("priv_vfs_generation(asroot, injail)", error, -1,
EPERM);
if (asroot && !injail)
expect("priv_vfs_generation(asroot, !injail)", error, 0, 0);
if (!asroot && injail)
expect("priv_vfs_generation(!asroot, injail)", error, -1,
EPERM);
if (!asroot && !injail)
expect("priv_vfs_generation(!asroot, !injail)", error, -1,
EPERM);
}
void
priv_vfs_generation_cleanup(int asroot, int injail, struct test *test)
{
if (fpath_initialized) {
(void)unlink(fpath);
fpath_initialized = 0;
}
}
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