9fa5f6b4b9
implemented properly for a number of kernel subsystems. In general, they try to exercise the privilege first as the root user, then as a test user, in order to determine when privilege is being checked. Currently, these tests do not compare inside/outside jail, and probably should be enhanced to do that. Sponsored by: nCircle Network Security, Inc. Obtained from: TrustedBSD Project
138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/*-
|
|
* Copyright (c) 2006 nCircle Network Security, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed by Robert N. M. Watson for the TrustedBSD
|
|
* Project under contract to nCircle Network Security, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Test that raising current resource limits above hard resource limits
|
|
* requires privilege. There is one privilege check, but two conditions:
|
|
*
|
|
* - To raise the current above the maximum.
|
|
*
|
|
* - To raise the maximum.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
|
|
#include "main.h"
|
|
|
|
void
|
|
priv_proc_setrlimit(void)
|
|
{
|
|
struct rlimit rl, rl_lower, rl_raise_max, rl_raise_cur;
|
|
int error;
|
|
|
|
assert_root();
|
|
|
|
/*
|
|
* To make sure that there is room to raise the resource limit, we
|
|
* must first lower it. Otherwise, if the resource limit is already
|
|
* at the global maximum, that complicates matters. In principle, we
|
|
* can bump into privilege failures during setup, but there's not
|
|
* much we can do about that. Keep this prototypical setting around
|
|
* as the target to restore to later.
|
|
*/
|
|
if (getrlimit(RLIMIT_DATA, &rl) < 0)
|
|
err(-1, "getrlimit(RLIMIT_DATA)");
|
|
|
|
/*
|
|
* What to lower to before trying to raise.
|
|
*/
|
|
rl_lower = rl;
|
|
rl_lower.rlim_cur -= 10;
|
|
rl_lower.rlim_max = rl_lower.rlim_cur;
|
|
|
|
/*
|
|
* Raise the maximum.
|
|
*/
|
|
rl_raise_max = rl;
|
|
rl_raise_max.rlim_max += 10;
|
|
|
|
/*
|
|
* Raise the current above the maximum.
|
|
*/
|
|
rl_raise_cur = rl;
|
|
rl_raise_cur.rlim_cur += 10;
|
|
|
|
/*
|
|
* Test raising the maximum with privilege.
|
|
*/
|
|
if (setrlimit(RLIMIT_DATA, &rl_lower) < 0)
|
|
err(-1, "setrlimit(RLIMIT_DATA, lower) as root");
|
|
|
|
if (setrlimit(RLIMIT_DATA, &rl_raise_max) < 0)
|
|
err(-1, "setrlimit(RLIMIT_DATA, raise_max) as root");
|
|
|
|
/*
|
|
* Test raising the current above the maximum with privilege.
|
|
*/
|
|
if (setrlimit(RLIMIT_DATA, &rl_lower) < 0)
|
|
err(-1, "setrlimit(RLIMIT_DATA, lower) as root");
|
|
|
|
if (setrlimit(RLIMIT_DATA, &rl_raise_cur) < 0)
|
|
err(-1, "setrlimit(RLIMIT_DATA, raise_cur) as root");
|
|
|
|
/*
|
|
* Test raising the maximum without privilege.
|
|
*/
|
|
if (setrlimit(RLIMIT_DATA, &rl_lower) < 0)
|
|
err(-1, "setrlimit(RLIMIT_DATA, lower) as root");
|
|
|
|
set_euid(UID_OTHER);
|
|
error = setrlimit(RLIMIT_DATA, &rl_raise_max);
|
|
if (error == 0)
|
|
errx(-1,
|
|
"setrlimit(RLIMIT_DATA, raise_max) succeeded as !root");
|
|
if (errno != EPERM)
|
|
err(-1, "setrlimit(RLIMIT_DATA, raise_max) wrong errno %d "
|
|
"as !root", errno);
|
|
|
|
/*
|
|
* Test raising the current above the maximum without privilege.
|
|
*/
|
|
set_euid(UID_ROOT);
|
|
if (setrlimit(RLIMIT_DATA, &rl_lower) < 0)
|
|
err(-1, "setrlimit(RLIMIT_DATA, lower) as root");
|
|
set_euid(UID_OTHER);
|
|
|
|
error = setrlimit(RLIMIT_DATA, &rl_raise_cur);
|
|
if (error == 0)
|
|
errx(-1,
|
|
"setrlimit(RLIMIT_DATA, raise_cur) succeeded as !root");
|
|
if (errno != EPERM)
|
|
err(-1, "setrlimit(RLIMIT_DATA, raise_cur) wrong errno %d "
|
|
"as !root", errno);
|
|
}
|