9fa5f6b4b9
implemented properly for a number of kernel subsystems. In general, they try to exercise the privilege first as the root user, then as a test user, in order to determine when privilege is being checked. Currently, these tests do not compare inside/outside jail, and probably should be enhanced to do that. Sponsored by: nCircle Network Security, Inc. Obtained from: TrustedBSD Project
371 lines
8.7 KiB
C
371 lines
8.7 KiB
C
/*-
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* Copyright (c) 2006 nCircle Network Security, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson for the TrustedBSD
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* Project under contract to nCircle Network Security, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
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* INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This is a joint test of both the read and write privileges with respect to
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* discretionary file system access control (permissions). Only permissions,
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* not ACL semantics, and only privilege-related checks are performed.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "main.h"
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struct test_arguments {
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int open_flags;
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uid_t proc_uid;
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gid_t proc_gid;
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uid_t file_uid;
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gid_t file_gid;
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};
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/*
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* Rather special-purpose, don't reuse. Will need updating if anything other
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* than O_RDONLY and O_WRONLY are to be used in tests.
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*/
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static const char *
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flags_to_string(int flags)
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{
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switch (flags) {
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case O_RDONLY:
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return ("O_RDONLY");
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case O_WRONLY:
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return ("O_WRONLY");
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default:
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return ("unknown");
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}
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}
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static void
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test_perm(struct test_arguments ta, mode_t file_mode, int expected)
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{
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uid_t proc_uid, file_uid;
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gid_t proc_gid, file_gid;
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int fd, open_flags;
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char fpath[1024];
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proc_uid = ta.proc_uid;
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proc_gid = ta.proc_gid;
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file_uid = ta.file_uid;
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file_gid = ta.file_gid;
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open_flags = ta.open_flags;
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setup_file(fpath, file_uid, file_gid, file_mode);
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set_creds(proc_uid, proc_gid);
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fd = open(fpath, open_flags);
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if (expected == 0) {
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if (fd <= 0) {
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warn("test_perm(%s, %d, %d, %d, %d, %04o, %d) "
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"returned %d instead of %d",
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flags_to_string(open_flags), proc_uid, proc_gid,
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file_uid, file_gid, file_mode, expected,
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errno, expected);
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restore_creds();
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(void)unlink(fpath);
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exit(-1);
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}
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close(fd);
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} else {
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if (fd >= 0) {
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warnx("test_perm(%s, %d, %d, %d, %d, %04o, %d)"
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" returned 0 instead of %d",
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flags_to_string(open_flags), proc_uid, proc_gid,
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file_uid, file_gid, file_mode, expected,
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expected);
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close(fd);
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restore_creds();
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(void)unlink(fpath);
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exit(-1);
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} else if (errno != expected) {
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warn("test_perm(%s, %d, %d, %d, %d, %04o, %d)"
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" returned %d instead of %d",
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flags_to_string(open_flags), proc_uid, proc_gid,
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file_uid, file_gid, file_mode, expected,
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errno, expected);
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restore_creds();
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(void)unlink(fpath);
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exit(-1);
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}
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}
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restore_creds();
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(void)unlink(fpath);
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}
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static const gid_t gidset[] = { GID_WHEEL };
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static void
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preamble(void)
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{
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if (getuid() != UID_ROOT)
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errx(-1, "must be run as root");
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if (setgroups(1, gidset) < 0)
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err(-1, "setgroups(1, {%d})", GID_WHEEL);
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}
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void
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priv_vfs_read(void)
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{
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struct test_arguments ta;
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preamble();
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ta.open_flags = O_RDONLY;
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/*
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* Privileged user and file owner. All tests should pass.
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*/
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ta.proc_uid = UID_ROOT;
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ta.proc_gid = GID_WHEEL;
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ta.file_uid = UID_ROOT;
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ta.file_gid = GID_WHEEL;
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test_perm(ta, 0000, 0);
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test_perm(ta, 0100, 0);
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test_perm(ta, 0200, 0);
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test_perm(ta, 0300, 0);
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test_perm(ta, 0400, 0);
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test_perm(ta, 0500, 0);
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test_perm(ta, 0600, 0);
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test_perm(ta, 0700, 0);
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/*
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* Privileged user and file group. All tests should pass.
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*/
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ta.proc_uid = UID_ROOT;
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ta.proc_gid = GID_WHEEL;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_WHEEL;
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test_perm(ta, 0000, 0);
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test_perm(ta, 0010, 0);
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test_perm(ta, 0020, 0);
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test_perm(ta, 0030, 0);
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test_perm(ta, 0040, 0);
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test_perm(ta, 0050, 0);
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test_perm(ta, 0060, 0);
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test_perm(ta, 0070, 0);
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/*
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* Privileged user and file other. All tests should pass.
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*/
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ta.proc_uid = UID_ROOT;
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ta.proc_gid = GID_WHEEL;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_OWNER;
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test_perm(ta, 0000, 0);
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test_perm(ta, 0001, 0);
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test_perm(ta, 0002, 0);
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test_perm(ta, 0003, 0);
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test_perm(ta, 0004, 0);
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test_perm(ta, 0005, 0);
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test_perm(ta, 0006, 0);
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test_perm(ta, 0007, 0);
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/*
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* Unprivileged user and file owner. Various DAC failures.
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*/
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ta.proc_uid = UID_OWNER;
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ta.proc_gid = GID_OWNER;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_OWNER;
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test_perm(ta, 0000, EACCES);
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test_perm(ta, 0100, EACCES);
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test_perm(ta, 0200, EACCES);
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test_perm(ta, 0300, EACCES);
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test_perm(ta, 0400, 0);
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test_perm(ta, 0500, 0);
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test_perm(ta, 0600, 0);
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test_perm(ta, 0700, 0);
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/*
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* Unprivileged user and file group. Various DAC failures.
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*/
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ta.proc_uid = UID_OTHER;
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ta.proc_gid = GID_OWNER;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_OWNER;
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test_perm(ta, 0000, EACCES);
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test_perm(ta, 0010, EACCES);
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test_perm(ta, 0020, EACCES);
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test_perm(ta, 0030, EACCES);
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test_perm(ta, 0040, 0);
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test_perm(ta, 0050, 0);
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test_perm(ta, 0060, 0);
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test_perm(ta, 0070, 0);
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/*
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* Unprivileged user and file other. Various DAC failures.
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*/
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ta.proc_uid = UID_OTHER;
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ta.proc_gid = GID_OTHER;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_OWNER;
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test_perm(ta, 0000, EACCES);
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test_perm(ta, 0001, EACCES);
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test_perm(ta, 0002, EACCES);
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test_perm(ta, 0003, EACCES);
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test_perm(ta, 0004, 0);
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test_perm(ta, 0005, 0);
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test_perm(ta, 0006, 0);
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test_perm(ta, 0007, 0);
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}
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void
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priv_vfs_write(void)
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{
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struct test_arguments ta;
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preamble();
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ta.open_flags = O_WRONLY;
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/*
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* Privileged user and file owner. All tests should pass.
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*/
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ta.proc_uid = UID_ROOT;
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ta.proc_gid = GID_WHEEL;
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ta.file_uid = UID_ROOT;
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ta.file_gid = GID_WHEEL;
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test_perm(ta, 0000, 0);
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test_perm(ta, 0100, 0);
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test_perm(ta, 0200, 0);
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test_perm(ta, 0300, 0);
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test_perm(ta, 0400, 0);
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test_perm(ta, 0500, 0);
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test_perm(ta, 0600, 0);
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test_perm(ta, 0700, 0);
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/*
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* Privileged user and file group. All tests should pass.
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*/
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ta.proc_uid = UID_ROOT;
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ta.proc_gid = GID_WHEEL;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_WHEEL;
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test_perm(ta, 0000, 0);
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test_perm(ta, 0010, 0);
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test_perm(ta, 0020, 0);
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test_perm(ta, 0030, 0);
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test_perm(ta, 0040, 0);
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test_perm(ta, 0050, 0);
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test_perm(ta, 0060, 0);
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test_perm(ta, 0070, 0);
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/*
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* Privileged user and file other. All tests should pass.
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*/
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ta.proc_uid = UID_ROOT;
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ta.proc_gid = GID_WHEEL;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_OWNER;
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test_perm(ta, 0000, 0);
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test_perm(ta, 0001, 0);
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test_perm(ta, 0002, 0);
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test_perm(ta, 0003, 0);
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test_perm(ta, 0004, 0);
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test_perm(ta, 0005, 0);
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test_perm(ta, 0006, 0);
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test_perm(ta, 0007, 0);
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/*
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* Unprivileged user and file owner. Various DAC failures.
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*/
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ta.proc_uid = UID_OWNER;
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ta.proc_gid = GID_OWNER;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_OWNER;
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test_perm(ta, 0000, EACCES);
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test_perm(ta, 0100, EACCES);
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test_perm(ta, 0200, 0);
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test_perm(ta, 0300, 0);
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test_perm(ta, 0400, EACCES);
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test_perm(ta, 0500, EACCES);
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test_perm(ta, 0600, 0);
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test_perm(ta, 0700, 0);
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/*
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* Unprivileged user and file group. Various DAC failures.
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*/
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ta.proc_uid = UID_OTHER;
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ta.proc_gid = GID_OWNER;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_OWNER;
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test_perm(ta, 0000, EACCES);
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test_perm(ta, 0010, EACCES);
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test_perm(ta, 0020, 0);
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test_perm(ta, 0030, 0);
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test_perm(ta, 0040, EACCES);
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test_perm(ta, 0050, EACCES);
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test_perm(ta, 0060, 0);
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test_perm(ta, 0070, 0);
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/*
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* Unprivileged user and file other. Various DAC failures.
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*/
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ta.proc_uid = UID_OTHER;
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ta.proc_gid = GID_OTHER;
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ta.file_uid = UID_OWNER;
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ta.file_gid = GID_OWNER;
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test_perm(ta, 0000, EACCES);
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test_perm(ta, 0001, EACCES);
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test_perm(ta, 0002, 0);
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test_perm(ta, 0003, 0);
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test_perm(ta, 0004, EACCES);
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test_perm(ta, 0005, EACCES);
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test_perm(ta, 0006, 0);
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test_perm(ta, 0007, 0);
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}
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