1 /*- 2 * Copyright (c) 2006 nCircle Network Security, Inc. 3 * Copyright (c) 2007 Robert M. 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 * Confirm that privilege is required in the cases using chown(): 35 * 36 * - If the process euid does not match the file uid. 37 * 38 * - If the target uid is different than the current uid. 39 * 40 * - If the target gid changes and we the process is not a member of the new 41 * group. 42 */ 43 44 #include <sys/types.h> 45 #include <sys/stat.h> 46 47 #include <err.h> 48 #include <errno.h> 49 #include <stdio.h> 50 #include <unistd.h> 51 52 #include "main.h" 53 54 static char fpath[1024]; 55 static int fpath_initialized; 56 57 /* 58 * Check that changing the uid of a file requires privilege. 59 */ 60 int 61 priv_vfs_chown_uid_setup(int asroot, int injail, struct test *test) 62 { 63 64 setup_file("priv_vfs_chown_uid: fpath", fpath, UID_ROOT, GID_WHEEL, 65 0600); 66 fpath_initialized = 1; 67 return (0); 68 } 69 70 void 71 priv_vfs_chown_uid(int asroot, int injail, struct test *test) 72 { 73 int error; 74 75 error = chown(fpath, UID_OWNER, -1); 76 if (asroot && injail) 77 expect("priv_vfs_chown_uid(root, jail)", error, 0, 0); 78 if (asroot && !injail) 79 expect("priv_vfs_chown_uid(root, !jail)", error, 0, 0); 80 if (!asroot && injail) 81 expect("priv_vfs_chown_uid(!root, jail)", error, -1, EPERM); 82 if (!asroot && !injail) 83 expect("priv_vfs_chown_uid(!root, !jail)", error, -1, EPERM); 84 } 85 86 /* 87 * Check that changing the gid of a file owned by the user is allowed without 88 * privilege as long as the gid matches the process. 89 */ 90 int 91 priv_vfs_chown_mygid_setup(int asroot, int injail, struct test *test) 92 { 93 94 /* 95 * Create a file with a matching uid to the test process, but not a 96 * matching gid. 97 */ 98 setup_file("priv_vfs_chown_mygid: fpath", fpath, asroot ? UID_ROOT : 99 UID_OWNER, GID_OTHER, 0600); 100 fpath_initialized = 1; 101 return (0); 102 } 103 104 void 105 priv_vfs_chown_mygid(int asroot, int injail, struct test *test) 106 { 107 int error; 108 109 error = chown(fpath, -1, asroot ? GID_WHEEL : GID_OWNER); 110 if (asroot && injail) 111 expect("priv_vfs_chown_mygid(root, jail)", error, 0, 0); 112 if (asroot && !injail) 113 expect("priv_vfs_chown_mygid(root, !jail)", error, 0, 0); 114 if (!asroot && injail) 115 expect("priv_vfs_chown_mygid(!root, !jail)", error, 0, 0); 116 if (!asroot && !injail) 117 expect("priv_vfs_chown_mygid(!root, !jail)", error, 0, 0); 118 } 119 120 /* 121 * Check that changing the gid of a file owned by the user is not allowed 122 * without privilege if the gid doesn't match the process. 123 */ 124 int 125 priv_vfs_chown_othergid_setup(int asroot, int injail, struct test *test) 126 { 127 128 /* 129 * Create a file with a matching uid to the test process with a 130 * matching gid. 131 */ 132 setup_file("priv_vfs_chown_othergid: fpath", fpath, asroot ? UID_ROOT 133 : UID_OWNER, asroot ? GID_WHEEL : GID_OWNER, 0600); 134 fpath_initialized = 1; 135 return (0); 136 } 137 138 void 139 priv_vfs_chown_othergid(int asroot, int injail, struct test *test) 140 { 141 int error; 142 143 error = chown(fpath, -1, GID_OTHER); 144 if (asroot && injail) 145 expect("priv_vfs_chown_othergid(root, jail)", error, 0, 0); 146 if (asroot && !injail) 147 expect("priv_vfs_chown_othergid(root, !jail)", error, 0, 0); 148 if (!asroot && injail) 149 expect("priv_vfs_chown_othergid(!root, !jail)", error, -1, 150 EPERM); 151 if (!asroot && !injail) 152 expect("priv_vfs_chown_othergid(!root, !jail)", error, -1, 153 EPERM); 154 } 155 156 void 157 priv_vfs_chown_cleanup(int asroot, int injail, struct test *test) 158 { 159 160 if (fpath_initialized) { 161 (void)unlink(fpath); 162 fpath_initialized = 0; 163 } 164 } 165