1162271Srwatson/*- 2162271Srwatson * Copyright (c) 2006 nCircle Network Security, Inc. 3172106Srwatson * Copyright (c) 2007 Robert N. M. Watson 4162271Srwatson * All rights reserved. 5162271Srwatson * 6162271Srwatson * This software was developed by Robert N. M. Watson for the TrustedBSD 7162271Srwatson * Project under contract to nCircle Network Security, Inc. 8162271Srwatson * 9162271Srwatson * Redistribution and use in source and binary forms, with or without 10162271Srwatson * modification, are permitted provided that the following conditions 11162271Srwatson * are met: 12162271Srwatson * 1. Redistributions of source code must retain the above copyright 13162271Srwatson * notice, this list of conditions and the following disclaimer. 14162271Srwatson * 2. Redistributions in binary form must reproduce the above copyright 15162271Srwatson * notice, this list of conditions and the following disclaimer in the 16162271Srwatson * documentation and/or other materials provided with the distribution. 17162271Srwatson * 18162271Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19162271Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20162271Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21162271Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY, 22162271Srwatson * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23162271Srwatson * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 24162271Srwatson * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 25162271Srwatson * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 26162271Srwatson * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 27162271Srwatson * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28162271Srwatson * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29162271Srwatson * 30162271Srwatson * $FreeBSD$ 31162271Srwatson */ 32162271Srwatson 33162271Srwatson/* 34162271Srwatson * Test privilege check on /dev/io. By default, the permissions also protect 35162271Srwatson * against non-superuser access, so this program will modify permissions on 36172106Srwatson * /dev/io to allow world access, and revert the change on exit. This is not 37172106Srwatson * good for run-time security, but is necessary to test the checks properly. 38162271Srwatson */ 39162271Srwatson 40162271Srwatson#include <sys/types.h> 41162271Srwatson#include <sys/stat.h> 42162271Srwatson 43162271Srwatson#include <err.h> 44162271Srwatson#include <errno.h> 45162271Srwatson#include <fcntl.h> 46162271Srwatson#include <unistd.h> 47162271Srwatson 48162271Srwatson#include "main.h" 49162271Srwatson 50172106Srwatson#define NEW_PERMS 0666 51162271Srwatson#define DEV_IO "/dev/io" 52162271Srwatson#define EXPECTED_PERMS 0600 53162271Srwatson 54172106Srwatsonstatic int initialized; 55172106Srwatsonstatic mode_t saved_perms; 56162271Srwatson 57172106Srwatsonint 58172106Srwatsonpriv_io_setup(int asroot, int asjail, struct test *test) 59162271Srwatson{ 60162271Srwatson struct stat sb; 61162271Srwatson 62172106Srwatson if (stat(DEV_IO, &sb) < 0) { 63172106Srwatson warn("priv_io_setup: stat(%s)", DEV_IO); 64172106Srwatson return (-1); 65172106Srwatson } 66162271Srwatson saved_perms = sb.st_mode & ALLPERMS; 67172106Srwatson if (saved_perms != EXPECTED_PERMS) { 68172106Srwatson warnx("priv_io_setup: perms = 0%o; expected 0%o", 69172106Srwatson saved_perms, EXPECTED_PERMS); 70172106Srwatson return (-1); 71172106Srwatson } 72172106Srwatson if (chmod(DEV_IO, NEW_PERMS) < 0) { 73172106Srwatson warn("priv_io_setup: chmod(%s, 0%o)", DEV_IO, NEW_PERMS); 74172106Srwatson return (-1); 75172106Srwatson } 76172106Srwatson initialized = 1; 77172106Srwatson return (0); 78162271Srwatson} 79162271Srwatson 80172106Srwatsonvoid 81172106Srwatsonpriv_io(int asroot, int injail, struct test *test) 82162271Srwatson{ 83172106Srwatson int error, fd; 84162271Srwatson 85162271Srwatson fd = open(DEV_IO, O_RDONLY); 86172106Srwatson if (fd < 0) 87172106Srwatson error = -1; 88172106Srwatson else 89172106Srwatson error = 0; 90172106Srwatson if (asroot && injail) 91172106Srwatson expect("priv_io(asroot, injail)", error, -1, EPERM); 92172106Srwatson if (asroot && !injail) 93172106Srwatson expect("priv_io(asroot, !injail)", error, 0, 0); 94172106Srwatson if (!asroot && injail) 95172106Srwatson expect("priv_io(!asroot, injail)", error, -1, EPERM); 96172106Srwatson if (!asroot && !injail) 97172106Srwatson expect("priv_io(!asroot, !injail)", error, -1, EPERM); 98172106Srwatson if (fd != -1) 99162271Srwatson close(fd); 100162271Srwatson} 101162271Srwatson 102162271Srwatsonvoid 103172106Srwatsonpriv_io_cleanup(int asroot, int asjail, struct test *test) 104162271Srwatson{ 105162271Srwatson 106172106Srwatson if (!initialized) 107172106Srwatson return; 108172106Srwatson if (chmod(DEV_IO, saved_perms) < 0) 109172106Srwatson err(-1, "priv_io_cleanup: chmod(%s, 0%o)", DEV_IO, 110172106Srwatson saved_perms); 111172106Srwatson initialized = 0; 112162271Srwatson} 113