/*-
* 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.
*/
/*
* Test privilege check on /dev/io. By default, the permissions also protect
* against non-superuser access, so this program will modify permissions on
* /dev/io to allow world access, and revert the change on exit. This is not
* good for run-time security, but is necessary to test the checks properly.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "main.h"
#define NEW_PERMS 0666
#define DEV_IO "/dev/io"
#define EXPECTED_PERMS 0600
static int initialized;
static mode_t saved_perms;
int
priv_io_setup(int asroot, int asjail, struct test *test)
{
struct stat sb;
if (stat(DEV_IO, &sb) < 0) {
warn("priv_io_setup: stat(%s)", DEV_IO);
return (-1);
}
saved_perms = sb.st_mode & ALLPERMS;
if (saved_perms != EXPECTED_PERMS) {
warnx("priv_io_setup: perms = 0%o; expected 0%o",
saved_perms, EXPECTED_PERMS);
return (-1);
}
if (chmod(DEV_IO, NEW_PERMS) < 0) {
warn("priv_io_setup: chmod(%s, 0%o)", DEV_IO, NEW_PERMS);
return (-1);
}
initialized = 1;
return (0);
}
void
priv_io(int asroot, int injail, struct test *test)
{
int error, fd;
fd = open(DEV_IO, O_RDONLY);
if (fd < 0)
error = -1;
else
error = 0;
if (asroot && injail)
expect("priv_io(asroot, injail)", error, -1, EPERM);
if (asroot && !injail)
expect("priv_io(asroot, !injail)", error, 0, 0);
if (!asroot && injail)
expect("priv_io(!asroot, injail)", error, -1, EPERM);
if (!asroot && !injail)
expect("priv_io(!asroot, !injail)", error, -1, EPERM);
if (fd != -1)
close(fd);
}
void
priv_io_cleanup(int asroot, int asjail, struct test *test)
{
if (!initialized)
return;
if (chmod(DEV_IO, saved_perms) < 0)
err(-1, "priv_io_cleanup: chmod(%s, 0%o)", DEV_IO,
saved_perms);
initialized = 0;
}
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