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/*-
* Copyright (c) 2006 nCircle Network Security, Inc.
* 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.
*
* $FreeBSD$
*/
/*
* This is a joint test of both the read and write privileges with respect to
* discretionary file system access control (permissions). Only permissions,
* not ACL semantics, and only privilege-related checks are performed.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "main.h"
struct test_arguments {
int open_flags;
uid_t proc_uid;
gid_t proc_gid;
uid_t file_uid;
gid_t file_gid;
};
/*
* Rather special-purpose, don't reuse. Will need updating if anything other
* than O_RDONLY and O_WRONLY are to be used in tests.
*/
static const char *
flags_to_string(int flags)
{
switch (flags) {
case O_RDONLY:
return ("O_RDONLY");
case O_WRONLY:
return ("O_WRONLY");
default:
return ("unknown");
}
}
static void
test_perm(struct test_arguments ta, mode_t file_mode, int expected)
{
uid_t proc_uid, file_uid;
gid_t proc_gid, file_gid;
int fd, open_flags;
char fpath[1024];
proc_uid = ta.proc_uid;
proc_gid = ta.proc_gid;
file_uid = ta.file_uid;
file_gid = ta.file_gid;
open_flags = ta.open_flags;
setup_file(fpath, file_uid, file_gid, file_mode);
set_creds(proc_uid, proc_gid);
fd = open(fpath, open_flags);
if (expected == 0) {
if (fd <= 0) {
warn("test_perm(%s, %d, %d, %d, %d, %04o, %d) "
"returned %d instead of %d",
flags_to_string(open_flags), proc_uid, proc_gid,
file_uid, file_gid, file_mode, expected,
errno, expected);
restore_creds();
(void)unlink(fpath);
exit(-1);
}
close(fd);
} else {
if (fd >= 0) {
warnx("test_perm(%s, %d, %d, %d, %d, %04o, %d)"
" returned 0 instead of %d",
flags_to_string(open_flags), proc_uid, proc_gid,
file_uid, file_gid, file_mode, expected,
expected);
close(fd);
restore_creds();
(void)unlink(fpath);
exit(-1);
} else if (errno != expected) {
warn("test_perm(%s, %d, %d, %d, %d, %04o, %d)"
" returned %d instead of %d",
flags_to_string(open_flags), proc_uid, proc_gid,
file_uid, file_gid, file_mode, expected,
errno, expected);
restore_creds();
(void)unlink(fpath);
exit(-1);
}
}
restore_creds();
(void)unlink(fpath);
}
static const gid_t gidset[] = { GID_WHEEL };
static void
preamble(void)
{
if (getuid() != UID_ROOT)
errx(-1, "must be run as root");
if (setgroups(1, gidset) < 0)
err(-1, "setgroups(1, {%d})", GID_WHEEL);
}
void
priv_vfs_read(void)
{
struct test_arguments ta;
preamble();
ta.open_flags = O_RDONLY;
/*
* Privileged user and file owner. All tests should pass.
*/
ta.proc_uid = UID_ROOT;
ta.proc_gid = GID_WHEEL;
ta.file_uid = UID_ROOT;
ta.file_gid = GID_WHEEL;
test_perm(ta, 0000, 0);
test_perm(ta, 0100, 0);
test_perm(ta, 0200, 0);
test_perm(ta, 0300, 0);
test_perm(ta, 0400, 0);
test_perm(ta, 0500, 0);
test_perm(ta, 0600, 0);
test_perm(ta, 0700, 0);
/*
* Privileged user and file group. All tests should pass.
*/
ta.proc_uid = UID_ROOT;
ta.proc_gid = GID_WHEEL;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_WHEEL;
test_perm(ta, 0000, 0);
test_perm(ta, 0010, 0);
test_perm(ta, 0020, 0);
test_perm(ta, 0030, 0);
test_perm(ta, 0040, 0);
test_perm(ta, 0050, 0);
test_perm(ta, 0060, 0);
test_perm(ta, 0070, 0);
/*
* Privileged user and file other. All tests should pass.
*/
ta.proc_uid = UID_ROOT;
ta.proc_gid = GID_WHEEL;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_OWNER;
test_perm(ta, 0000, 0);
test_perm(ta, 0001, 0);
test_perm(ta, 0002, 0);
test_perm(ta, 0003, 0);
test_perm(ta, 0004, 0);
test_perm(ta, 0005, 0);
test_perm(ta, 0006, 0);
test_perm(ta, 0007, 0);
/*
* Unprivileged user and file owner. Various DAC failures.
*/
ta.proc_uid = UID_OWNER;
ta.proc_gid = GID_OWNER;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_OWNER;
test_perm(ta, 0000, EACCES);
test_perm(ta, 0100, EACCES);
test_perm(ta, 0200, EACCES);
test_perm(ta, 0300, EACCES);
test_perm(ta, 0400, 0);
test_perm(ta, 0500, 0);
test_perm(ta, 0600, 0);
test_perm(ta, 0700, 0);
/*
* Unprivileged user and file group. Various DAC failures.
*/
ta.proc_uid = UID_OTHER;
ta.proc_gid = GID_OWNER;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_OWNER;
test_perm(ta, 0000, EACCES);
test_perm(ta, 0010, EACCES);
test_perm(ta, 0020, EACCES);
test_perm(ta, 0030, EACCES);
test_perm(ta, 0040, 0);
test_perm(ta, 0050, 0);
test_perm(ta, 0060, 0);
test_perm(ta, 0070, 0);
/*
* Unprivileged user and file other. Various DAC failures.
*/
ta.proc_uid = UID_OTHER;
ta.proc_gid = GID_OTHER;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_OWNER;
test_perm(ta, 0000, EACCES);
test_perm(ta, 0001, EACCES);
test_perm(ta, 0002, EACCES);
test_perm(ta, 0003, EACCES);
test_perm(ta, 0004, 0);
test_perm(ta, 0005, 0);
test_perm(ta, 0006, 0);
test_perm(ta, 0007, 0);
}
void
priv_vfs_write(void)
{
struct test_arguments ta;
preamble();
ta.open_flags = O_WRONLY;
/*
* Privileged user and file owner. All tests should pass.
*/
ta.proc_uid = UID_ROOT;
ta.proc_gid = GID_WHEEL;
ta.file_uid = UID_ROOT;
ta.file_gid = GID_WHEEL;
test_perm(ta, 0000, 0);
test_perm(ta, 0100, 0);
test_perm(ta, 0200, 0);
test_perm(ta, 0300, 0);
test_perm(ta, 0400, 0);
test_perm(ta, 0500, 0);
test_perm(ta, 0600, 0);
test_perm(ta, 0700, 0);
/*
* Privileged user and file group. All tests should pass.
*/
ta.proc_uid = UID_ROOT;
ta.proc_gid = GID_WHEEL;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_WHEEL;
test_perm(ta, 0000, 0);
test_perm(ta, 0010, 0);
test_perm(ta, 0020, 0);
test_perm(ta, 0030, 0);
test_perm(ta, 0040, 0);
test_perm(ta, 0050, 0);
test_perm(ta, 0060, 0);
test_perm(ta, 0070, 0);
/*
* Privileged user and file other. All tests should pass.
*/
ta.proc_uid = UID_ROOT;
ta.proc_gid = GID_WHEEL;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_OWNER;
test_perm(ta, 0000, 0);
test_perm(ta, 0001, 0);
test_perm(ta, 0002, 0);
test_perm(ta, 0003, 0);
test_perm(ta, 0004, 0);
test_perm(ta, 0005, 0);
test_perm(ta, 0006, 0);
test_perm(ta, 0007, 0);
/*
* Unprivileged user and file owner. Various DAC failures.
*/
ta.proc_uid = UID_OWNER;
ta.proc_gid = GID_OWNER;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_OWNER;
test_perm(ta, 0000, EACCES);
test_perm(ta, 0100, EACCES);
test_perm(ta, 0200, 0);
test_perm(ta, 0300, 0);
test_perm(ta, 0400, EACCES);
test_perm(ta, 0500, EACCES);
test_perm(ta, 0600, 0);
test_perm(ta, 0700, 0);
/*
* Unprivileged user and file group. Various DAC failures.
*/
ta.proc_uid = UID_OTHER;
ta.proc_gid = GID_OWNER;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_OWNER;
test_perm(ta, 0000, EACCES);
test_perm(ta, 0010, EACCES);
test_perm(ta, 0020, 0);
test_perm(ta, 0030, 0);
test_perm(ta, 0040, EACCES);
test_perm(ta, 0050, EACCES);
test_perm(ta, 0060, 0);
test_perm(ta, 0070, 0);
/*
* Unprivileged user and file other. Various DAC failures.
*/
ta.proc_uid = UID_OTHER;
ta.proc_gid = GID_OTHER;
ta.file_uid = UID_OWNER;
ta.file_gid = GID_OWNER;
test_perm(ta, 0000, EACCES);
test_perm(ta, 0001, EACCES);
test_perm(ta, 0002, 0);
test_perm(ta, 0003, 0);
test_perm(ta, 0004, EACCES);
test_perm(ta, 0005, EACCES);
test_perm(ta, 0006, 0);
test_perm(ta, 0007, 0);
}
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