2006-09-13 09:05:39 +00:00
|
|
|
/*-
|
|
|
|
* Copyright (c) 2006 nCircle Network Security, Inc.
|
2007-09-09 23:08:39 +00:00
|
|
|
* Copyright (c) 2007 Robert N. M. Watson
|
2006-09-13 09:05:39 +00:00
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* $FreeBSD$
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* There are three cases in which the file system will clear the setuid or
|
2007-09-09 23:08:39 +00:00
|
|
|
* setgid bits on a file when running unprivileged:
|
2006-09-13 09:05:39 +00:00
|
|
|
*
|
|
|
|
* - When the file is chown()'d and either of the uid or the gid is changed.
|
2007-09-09 23:08:39 +00:00
|
|
|
* (currently, only changing the file gid applies, as privilege is required
|
|
|
|
* to change the uid).
|
2006-09-13 09:05:39 +00:00
|
|
|
*
|
2007-09-09 23:08:39 +00:00
|
|
|
* - The file is written to successfully.
|
2006-09-13 09:05:39 +00:00
|
|
|
*
|
|
|
|
* - An extended attribute of the file is written to successfully.
|
|
|
|
*
|
2007-09-09 23:08:39 +00:00
|
|
|
* In each case, check that the flags are cleared if unprivileged, and that
|
|
|
|
* they aren't cleared if privileged.
|
|
|
|
*
|
|
|
|
* We can't use expect() as we're looking for side-effects rather than
|
|
|
|
* success/failure of the system call.
|
2006-09-13 09:05:39 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <sys/extattr.h>
|
|
|
|
#include <sys/stat.h>
|
|
|
|
|
|
|
|
#include <err.h>
|
|
|
|
#include <fcntl.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
|
|
|
|
#include "main.h"
|
|
|
|
|
2007-09-09 23:08:39 +00:00
|
|
|
static char fpath[1024];
|
|
|
|
static int fpath_initialized;
|
2006-09-13 09:05:39 +00:00
|
|
|
|
|
|
|
/*
|
2007-09-09 23:08:39 +00:00
|
|
|
* If running as root, check that SUID is still set; otherwise, check that it
|
|
|
|
* is not.
|
2006-09-13 09:05:39 +00:00
|
|
|
*/
|
|
|
|
static void
|
2007-09-09 23:08:39 +00:00
|
|
|
confirm_sugid(char *test_case, int asroot, int injail)
|
2006-09-13 09:05:39 +00:00
|
|
|
{
|
|
|
|
struct stat sb;
|
|
|
|
|
2007-09-09 23:08:39 +00:00
|
|
|
if (stat(fpath, &sb) < 0) {
|
|
|
|
warn("%s stat(%s)", test_case, fpath);
|
|
|
|
return;
|
2006-09-13 09:05:39 +00:00
|
|
|
}
|
2007-09-09 23:08:39 +00:00
|
|
|
if (asroot) {
|
|
|
|
if (!(sb.st_mode & S_ISUID))
|
|
|
|
warnx("%s(root, %s): !SUID", test_case, injail ?
|
|
|
|
"jail" : "!jail");
|
|
|
|
} else {
|
|
|
|
if (sb.st_mode & S_ISUID)
|
|
|
|
warnx("%s(!root, %s): SUID", test_case, injail ?
|
|
|
|
"jail" : "!jail");
|
2006-09-13 09:05:39 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-09-09 23:08:39 +00:00
|
|
|
int
|
|
|
|
priv_vfs_clearsugid_setup(int asroot, int injail, struct test *test)
|
2006-09-13 09:05:39 +00:00
|
|
|
{
|
|
|
|
|
2007-09-09 23:08:39 +00:00
|
|
|
setup_file("priv_vfs_clearsugid_setup: fpath", fpath, UID_OWNER,
|
|
|
|
GID_OTHER, 0600 | S_ISUID);
|
|
|
|
fpath_initialized = 1;
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
priv_vfs_clearsugid_chgrp(int asroot, int injail, struct test *test)
|
|
|
|
{
|
|
|
|
|
|
|
|
if (chown(fpath, -1, asroot ? GID_WHEEL : GID_OWNER) < 0)
|
|
|
|
err(-1, "priv_vfs_clearsugid_chgrp(%s, %s): chrgrp",
|
|
|
|
asroot ? "root" : "!root", injail ? "jail" : "!jail");
|
|
|
|
confirm_sugid("priv_vfs_clearsugid_chgrp", asroot, injail);
|
2006-09-13 09:05:39 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#define EA_NAMESPACE EXTATTR_NAMESPACE_USER
|
|
|
|
#define EA_NAME "clearsugid"
|
|
|
|
#define EA_DATA "test"
|
|
|
|
#define EA_SIZE (strlen(EA_DATA))
|
2007-09-09 23:08:39 +00:00
|
|
|
|
2006-09-13 09:05:39 +00:00
|
|
|
void
|
2007-09-09 23:08:39 +00:00
|
|
|
priv_vfs_clearsugid_extattr(int asroot, int injail, struct test *test)
|
2006-09-13 09:05:39 +00:00
|
|
|
{
|
|
|
|
|
|
|
|
if (extattr_set_file(fpath, EA_NAMESPACE, EA_NAME, EA_DATA, EA_SIZE)
|
2007-09-09 23:08:39 +00:00
|
|
|
< 0)
|
|
|
|
err(-1,
|
|
|
|
"priv_vfs_clearsugid_extattr(%s, %s): extattr_set_file",
|
|
|
|
asroot ? "root" : "!root", injail ? "jail" : "!jail");
|
|
|
|
confirm_sugid("priv_vfs_clearsugid_extattr", asroot, injail);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
priv_vfs_clearsugid_write(int asroot, int injail, struct test *test)
|
|
|
|
{
|
|
|
|
int fd;
|
|
|
|
|
2006-09-13 09:05:39 +00:00
|
|
|
fd = open(fpath, O_RDWR);
|
2007-09-09 23:08:39 +00:00
|
|
|
if (fd < 0)
|
|
|
|
err(-1, "priv_vfs_clearsugid_write(%s, %s): open",
|
|
|
|
asroot ? "root" : "!root", injail ? "jail" : "!jail");
|
|
|
|
if (write(fd, EA_DATA, EA_SIZE) < 0)
|
|
|
|
err(-1, "priv_vfs_clearsugid_write(%s, %s): write",
|
|
|
|
asroot ? "root" : "!root", injail ? "jail" : "!jail");
|
|
|
|
(void)close(fd);
|
|
|
|
confirm_sugid("priv_vfs_clearsugid_write", asroot, injail);
|
|
|
|
}
|
2006-09-13 09:05:39 +00:00
|
|
|
|
2007-09-09 23:08:39 +00:00
|
|
|
void
|
|
|
|
priv_vfs_clearsugid_cleanup(int asroot, int injail, struct test *test)
|
|
|
|
{
|
|
|
|
|
|
|
|
if (fpath_initialized) {
|
|
|
|
(void)unlink(fpath);
|
|
|
|
fpath_initialized = 0;
|
|
|
|
}
|
2006-09-13 09:05:39 +00:00
|
|
|
}
|