1 /*- 2 * Copyright (c) 2006 nCircle Network Security, Inc. 3 * Copyright (c) 2007 Robert N. M. Watson 4 * All rights reserved. 5 * 6 * This software was developed by Robert N. M. Watson for the TrustedBSD 7 * Project under contract to nCircle Network Security, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY, 22 * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 24 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 25 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 26 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 27 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 /* 34 * Test privilege check on /dev/io. By default, the permissions also protect 35 * against non-superuser access, so this program will modify permissions on 36 * /dev/io to allow world access, and revert the change on exit. This is not 37 * good for run-time security, but is necessary to test the checks properly. 38 */ 39 40 #include <sys/types.h> 41 #include <sys/stat.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <unistd.h> 47 48 #include "main.h" 49 50 #define NEW_PERMS 0666 51 #define DEV_IO "/dev/io" 52 #define EXPECTED_PERMS 0600 53 54 static int initialized; 55 static mode_t saved_perms; 56 57 int 58 priv_io_setup(int asroot, int asjail, struct test *test) 59 { 60 struct stat sb; 61 62 if (stat(DEV_IO, &sb) < 0) { 63 warn("priv_io_setup: stat(%s)", DEV_IO); 64 return (-1); 65 } 66 saved_perms = sb.st_mode & ALLPERMS; 67 if (saved_perms != EXPECTED_PERMS) { 68 warnx("priv_io_setup: perms = 0%o; expected 0%o", 69 saved_perms, EXPECTED_PERMS); 70 return (-1); 71 } 72 if (chmod(DEV_IO, NEW_PERMS) < 0) { 73 warn("priv_io_setup: chmod(%s, 0%o)", DEV_IO, NEW_PERMS); 74 return (-1); 75 } 76 initialized = 1; 77 return (0); 78 } 79 80 void 81 priv_io(int asroot, int injail, struct test *test) 82 { 83 int error, fd; 84 85 fd = open(DEV_IO, O_RDONLY); 86 if (fd < 0) 87 error = -1; 88 else 89 error = 0; 90 if (asroot && injail) 91 expect("priv_io(asroot, injail)", error, -1, EPERM); 92 if (asroot && !injail) 93 expect("priv_io(asroot, !injail)", error, 0, 0); 94 if (!asroot && injail) 95 expect("priv_io(!asroot, injail)", error, -1, EPERM); 96 if (!asroot && !injail) 97 expect("priv_io(!asroot, !injail)", error, -1, EPERM); 98 if (fd != -1) 99 close(fd); 100 } 101 102 void 103 priv_io_cleanup(int asroot, int asjail, struct test *test) 104 { 105 106 if (!initialized) 107 return; 108 if (chmod(DEV_IO, saved_perms) < 0) 109 err(-1, "priv_io_cleanup: chmod(%s, 0%o)", DEV_IO, 110 saved_perms); 111 initialized = 0; 112 } 113