/*-
* Copyright (c) 2006 nCircle Network Security, Inc.
* Copyright (c) 2007 Robert M. 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.
*/
/*
* Confirm that privilege is required in the cases using chown():
*
* - If the process euid does not match the file uid.
*
* - If the target uid is different than the current uid.
*
* - If the target gid changes and we the process is not a member of the new
* group.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include "main.h"
static char fpath[1024];
static int fpath_initialized;
/*
* Check that changing the uid of a file requires privilege.
*/
int
priv_vfs_chown_uid_setup(int asroot, int injail, struct test *test)
{
setup_file("priv_vfs_chown_uid: fpath", fpath, UID_ROOT, GID_WHEEL,
0600);
fpath_initialized = 1;
return (0);
}
void
priv_vfs_chown_uid(int asroot, int injail, struct test *test)
{
int error;
error = chown(fpath, UID_OWNER, -1);
if (asroot && injail)
expect("priv_vfs_chown_uid(root, jail)", error, 0, 0);
if (asroot && !injail)
expect("priv_vfs_chown_uid(root, !jail)", error, 0, 0);
if (!asroot && injail)
expect("priv_vfs_chown_uid(!root, jail)", error, -1, EPERM);
if (!asroot && !injail)
expect("priv_vfs_chown_uid(!root, !jail)", error, -1, EPERM);
}
/*
* Check that changing the gid of a file owned by the user is allowed without
* privilege as long as the gid matches the process.
*/
int
priv_vfs_chown_mygid_setup(int asroot, int injail, struct test *test)
{
/*
* Create a file with a matching uid to the test process, but not a
* matching gid.
*/
setup_file("priv_vfs_chown_mygid: fpath", fpath, asroot ? UID_ROOT :
UID_OWNER, GID_OTHER, 0600);
fpath_initialized = 1;
return (0);
}
void
priv_vfs_chown_mygid(int asroot, int injail, struct test *test)
{
int error;
error = chown(fpath, -1, asroot ? GID_WHEEL : GID_OWNER);
if (asroot && injail)
expect("priv_vfs_chown_mygid(root, jail)", error, 0, 0);
if (asroot && !injail)
expect("priv_vfs_chown_mygid(root, !jail)", error, 0, 0);
if (!asroot && injail)
expect("priv_vfs_chown_mygid(!root, !jail)", error, 0, 0);
if (!asroot && !injail)
expect("priv_vfs_chown_mygid(!root, !jail)", error, 0, 0);
}
/*
* Check that changing the gid of a file owned by the user is not allowed
* without privilege if the gid doesn't match the process.
*/
int
priv_vfs_chown_othergid_setup(int asroot, int injail, struct test *test)
{
/*
* Create a file with a matching uid to the test process with a
* matching gid.
*/
setup_file("priv_vfs_chown_othergid: fpath", fpath, asroot ? UID_ROOT
: UID_OWNER, asroot ? GID_WHEEL : GID_OWNER, 0600);
fpath_initialized = 1;
return (0);
}
void
priv_vfs_chown_othergid(int asroot, int injail, struct test *test)
{
int error;
error = chown(fpath, -1, GID_OTHER);
if (asroot && injail)
expect("priv_vfs_chown_othergid(root, jail)", error, 0, 0);
if (asroot && !injail)
expect("priv_vfs_chown_othergid(root, !jail)", error, 0, 0);
if (!asroot && injail)
expect("priv_vfs_chown_othergid(!root, !jail)", error, -1,
EPERM);
if (!asroot && !injail)
expect("priv_vfs_chown_othergid(!root, !jail)", error, -1,
EPERM);
}
void
priv_vfs_chown_cleanup(int asroot, int injail, struct test *test)
{
if (fpath_initialized) {
(void)unlink(fpath);
fpath_initialized = 0;
}
}
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