tools/regression/priv/priv_msgbuf.c

   1 /*-
   2  * Copyright (c) 2007 Robert M. M. Watson
   3  * All rights reserved.
   4  *
   5  * This software was developed by Robert N. M. Watson for the TrustedBSD
   6  * Project.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
  21  * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  23  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  24  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  25  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  26  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * Confirm that when security.bsd.unprivileged_read_msgbuf is set to 0,
  32  * privilege is required to read the kernel message buffer.
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/sysctl.h>
  37
  38 #include <err.h>
  39 #include <errno.h>
  40 #include <stdio.h>
  41
  42 #include "main.h"
  43
  44 #define MSGBUF_CONTROL_NAME     "security.bsd.unprivileged_read_msgbuf"
  45 #define MSGBUF_NAME             "kern.msgbuf"
  46
  47 /*
  48  * We must query and save the original value, then restore it when done.
  49  */
  50 static int unprivileged_read_msgbuf;
  51 static int unprivileged_read_msgbuf_initialized;
  52
  53 int
  54 priv_msgbuf_privonly_setup(int asroot, int injail, struct test *test)
  55 {
  56         size_t len;
  57         int newval;
  58
  59         /*
  60          * Separately query and set to make debugging easier.
  61          */
  62         len = sizeof(unprivileged_read_msgbuf);
  63         if (sysctlbyname(MSGBUF_CONTROL_NAME, &unprivileged_read_msgbuf,
  64             &len, NULL, 0) < 0) {
  65                 warn("priv_msgbuf_privonly_setup: sysctlbyname query");
  66                 return (-1);
  67         }
  68         newval = 0;
  69         if (sysctlbyname(MSGBUF_CONTROL_NAME, NULL, NULL, &newval,
  70             sizeof(newval)) < 0) {
  71                 warn("priv_msgbuf_privonly_setup: sysctlbyname set");
  72                 return (-1);
  73         }
  74         unprivileged_read_msgbuf_initialized = 1;
  75         return (0);
  76 }
  77
  78 void
  79 priv_msgbuf_privonly(int asroot, int injail, struct test *test)
  80 {
  81         size_t len;
  82         int error;
  83
  84         error = sysctlbyname(MSGBUF_NAME, NULL, &len, NULL, 0);
  85         if (asroot && injail)
  86                 expect("priv_msgbuf_privonly(asroot, injail)", error, -1,
  87                     EPERM);
  88         if (asroot && !injail)
  89                 expect("priv_msgbuf_privonly(asroot, !injail)", error, 0, 0);
  90         if (!asroot && injail)
  91                 expect("priv_msgbuf_privonly(!asroot, injail)", error, -1,
  92                     EPERM);
  93         if (!asroot && !injail)
  94                 expect("priv_msgbuf_privonly(!asroot, !injail)", error, -1,
  95                     EPERM);
  96 }
  97
  98 int
  99 priv_msgbuf_unprivok_setup(int asroot, int injail, struct test *test)
 100 {
 101         size_t len;
 102         int newval;
 103
 104         /*
 105          * Separately query and set to make debugging easier.
 106          */
 107         len = sizeof(unprivileged_read_msgbuf);
 108         if (sysctlbyname(MSGBUF_CONTROL_NAME, &unprivileged_read_msgbuf, &len,
 109             NULL, 0) < 0) {
 110                 warn("priv_msgbuf_unprivok_setup: sysctlbyname query");
 111                 return (-1);
 112         }
 113         newval = 1;
 114         if (sysctlbyname(MSGBUF_CONTROL_NAME, NULL, NULL, &newval,
 115             sizeof(newval)) < 0) {
 116                 warn("priv_msgbuf_unprivok_setup: sysctlbyname set");
 117                 return (-1);
 118         }
 119         unprivileged_read_msgbuf_initialized = 1;
 120         return (0);
 121 }
 122
 123 void
 124 priv_msgbuf_unprivok(int asroot, int injail, struct test *test)
 125 {
 126         size_t len;
 127         int error;
 128
 129         error = sysctlbyname(MSGBUF_NAME, NULL, &len, NULL, 0);
 130         if (asroot && injail)
 131                 expect("priv_msgbuf_unprivok(asroot, injail)", error, 0, 0);
 132         if (asroot && !injail)
 133                 expect("priv_msgbuf_unprivok(asroot, !injail)", error, 0, 0);
 134         if (!asroot && injail)
 135                 expect("priv_msgbuf_unprivok(!asroot, injail)", error, 0, 0);
 136         if (!asroot && !injail)
 137                 expect("priv_msgbuf_unprivok(!asroot, !injail)", error, 0, 0);
 138 }
 139
 140 void
 141 priv_msgbuf_cleanup(int asroot, int injail, struct test *test)
 142 {
 143
 144         if (unprivileged_read_msgbuf_initialized) {
 145                 (void)sysctlbyname(MSGBUF_NAME, NULL, NULL,
 146                     &unprivileged_read_msgbuf,
 147                     sizeof(unprivileged_read_msgbuf));
 148                 unprivileged_read_msgbuf_initialized = 0;
 149         }
 150 }