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  * $FreeBSD$
  30  */
  31
  32 /*
  33  * Confirm that when security.bsd.unprivileged_read_msgbuf is set to 0,
  34  * privilege is required to read the kernel message buffer.
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/sysctl.h>
  39
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <stdio.h>
  43
  44 #include "main.h"
  45
  46 #define MSGBUF_CONTROL_NAME     "security.bsd.unprivileged_read_msgbuf"
  47 #define MSGBUF_NAME             "kern.msgbuf"
  48
  49 /*
  50  * We must query and save the original value, then restore it when done.
  51  */
  52 static int unprivileged_read_msgbuf;
  53 static int unprivileged_read_msgbuf_initialized;
  54
  55 int
  56 priv_msgbuf_privonly_setup(int asroot, int injail, struct test *test)
  57 {
  58         size_t len;
  59         int newval;
  60
  61         /*
  62          * Separately query and set to make debugging easier.
  63          */
  64         len = sizeof(unprivileged_read_msgbuf);
  65         if (sysctlbyname(MSGBUF_CONTROL_NAME, &unprivileged_read_msgbuf,
  66             &len, NULL, 0) < 0) {
  67                 warn("priv_msgbuf_privonly_setup: sysctlbyname query");
  68                 return (-1);
  69         }
  70         newval = 0;
  71         if (sysctlbyname(MSGBUF_CONTROL_NAME, NULL, NULL, &newval,
  72             sizeof(newval)) < 0) {
  73                 warn("priv_msgbuf_privonly_setup: sysctlbyname set");
  74                 return (-1);
  75         }
  76         unprivileged_read_msgbuf_initialized = 1;
  77         return (0);
  78 }
  79
  80 void
  81 priv_msgbuf_privonly(int asroot, int injail, struct test *test)
  82 {
  83         size_t len;
  84         int error;
  85
  86         error = sysctlbyname(MSGBUF_NAME, NULL, &len, NULL, 0);
  87         if (asroot && injail)
  88                 expect("priv_msgbuf_privonly(asroot, injail)", error, -1,
  89                     EPERM);
  90         if (asroot && !injail)
  91                 expect("priv_msgbuf_privonly(asroot, !injail)", error, 0, 0);
  92         if (!asroot && injail)
  93                 expect("priv_msgbuf_privonly(!asroot, injail)", error, -1,
  94                     EPERM);
  95         if (!asroot && !injail)
  96                 expect("priv_msgbuf_privonly(!asroot, !injail)", error, -1,
  97                     EPERM);
  98 }
  99
 100 int
 101 priv_msgbuf_unprivok_setup(int asroot, int injail, struct test *test)
 102 {
 103         size_t len;
 104         int newval;
 105
 106         /*
 107          * Separately query and set to make debugging easier.
 108          */
 109         len = sizeof(unprivileged_read_msgbuf);
 110         if (sysctlbyname(MSGBUF_CONTROL_NAME, &unprivileged_read_msgbuf, &len,
 111             NULL, 0) < 0) {
 112                 warn("priv_msgbuf_unprivok_setup: sysctlbyname query");
 113                 return (-1);
 114         }
 115         newval = 1;
 116         if (sysctlbyname(MSGBUF_CONTROL_NAME, NULL, NULL, &newval,
 117             sizeof(newval)) < 0) {
 118                 warn("priv_msgbuf_unprivok_setup: sysctlbyname set");
 119                 return (-1);
 120         }
 121         unprivileged_read_msgbuf_initialized = 1;
 122         return (0);
 123 }
 124
 125 void
 126 priv_msgbuf_unprivok(int asroot, int injail, struct test *test)
 127 {
 128         size_t len;
 129         int error;
 130
 131         error = sysctlbyname(MSGBUF_NAME, NULL, &len, NULL, 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         if (!asroot && !injail)
 139                 expect("priv_msgbuf_unprivok(!asroot, !injail)", error, 0, 0);
 140 }
 141
 142 void
 143 priv_msgbuf_cleanup(int asroot, int injail, struct test *test)
 144 {
 145
 146         if (unprivileged_read_msgbuf_initialized) {
 147                 (void)sysctlbyname(MSGBUF_NAME, NULL, NULL,
 148                     &unprivileged_read_msgbuf,
 149                     sizeof(unprivileged_read_msgbuf));
 150                 unprivileged_read_msgbuf_initialized = 0;
 151         }
 152 }