/*-
* Copyright (c) 2007 Robert M. M. Watson
* All rights reserved.
*
* This software was developed by Robert N. M. Watson for the TrustedBSD
* Project.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
* INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Confirm that when security.bsd.unprivileged_read_msgbuf is set to 0,
* privilege is required to read the kernel message buffer.
*/
#include <sys/types.h>
#include <sys/sysctl.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include "main.h"
#define MSGBUF_CONTROL_NAME "security.bsd.unprivileged_read_msgbuf"
#define MSGBUF_NAME "kern.msgbuf"
/*
* We must query and save the original value, then restore it when done.
*/
static int unprivileged_read_msgbuf;
static int unprivileged_read_msgbuf_initialized;
int
priv_msgbuf_privonly_setup(int asroot, int injail, struct test *test)
{
size_t len;
int newval;
/*
* Separately query and set to make debugging easier.
*/
len = sizeof(unprivileged_read_msgbuf);
if (sysctlbyname(MSGBUF_CONTROL_NAME, &unprivileged_read_msgbuf,
&len, NULL, 0) < 0) {
warn("priv_msgbuf_privonly_setup: sysctlbyname query");
return (-1);
}
newval = 0;
if (sysctlbyname(MSGBUF_CONTROL_NAME, NULL, NULL, &newval,
sizeof(newval)) < 0) {
warn("priv_msgbuf_privonly_setup: sysctlbyname set");
return (-1);
}
unprivileged_read_msgbuf_initialized = 1;
return (0);
}
void
priv_msgbuf_privonly(int asroot, int injail, struct test *test)
{
size_t len;
int error;
error = sysctlbyname(MSGBUF_NAME, NULL, &len, NULL, 0);
if (asroot && injail)
expect("priv_msgbuf_privonly(asroot, injail)", error, -1,
EPERM);
if (asroot && !injail)
expect("priv_msgbuf_privonly(asroot, !injail)", error, 0, 0);
if (!asroot && injail)
expect("priv_msgbuf_privonly(!asroot, injail)", error, -1,
EPERM);
if (!asroot && !injail)
expect("priv_msgbuf_privonly(!asroot, !injail)", error, -1,
EPERM);
}
int
priv_msgbuf_unprivok_setup(int asroot, int injail, struct test *test)
{
size_t len;
int newval;
/*
* Separately query and set to make debugging easier.
*/
len = sizeof(unprivileged_read_msgbuf);
if (sysctlbyname(MSGBUF_CONTROL_NAME, &unprivileged_read_msgbuf, &len,
NULL, 0) < 0) {
warn("priv_msgbuf_unprivok_setup: sysctlbyname query");
return (-1);
}
newval = 1;
if (sysctlbyname(MSGBUF_CONTROL_NAME, NULL, NULL, &newval,
sizeof(newval)) < 0) {
warn("priv_msgbuf_unprivok_setup: sysctlbyname set");
return (-1);
}
unprivileged_read_msgbuf_initialized = 1;
return (0);
}
void
priv_msgbuf_unprivok(int asroot, int injail, struct test *test)
{
size_t len;
int error;
error = sysctlbyname(MSGBUF_NAME, NULL, &len, NULL, 0);
if (asroot && injail)
expect("priv_msgbuf_unprivok(asroot, injail)", error, 0, 0);
if (asroot && !injail)
expect("priv_msgbuf_unprivok(asroot, !injail)", error, 0, 0);
if (!asroot && injail)
expect("priv_msgbuf_unprivok(!asroot, injail)", error, 0, 0);
if (!asroot && !injail)
expect("priv_msgbuf_unprivok(!asroot, !injail)", error, 0, 0);
}
void
priv_msgbuf_cleanup(int asroot, int injail, struct test *test)
{
if (unprivileged_read_msgbuf_initialized) {
(void)sysctlbyname(MSGBUF_NAME, NULL, NULL,
&unprivileged_read_msgbuf,
sizeof(unprivileged_read_msgbuf));
unprivileged_read_msgbuf_initialized = 0;
}
}
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