tools/regression/priv/priv_io.c

   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 }