tools/regression/priv/priv_vfs_chown.c

   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 }