134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/*
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* Copyright (c) 2010 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*-
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* Copyright (c) 2006 nCircle Network Security, Inc.
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* Copyright (c) 2009 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson for the TrustedBSD
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* Project under contract to nCircle Network Security, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
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* INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/kauth.h>
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#if CONFIG_MACF
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#include <security/mac_framework.h>
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#endif
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int proc_check_footprint_priv(void);
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/*
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* Check a credential for privilege. Lots of good reasons to deny privilege;
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* only a few to grant it.
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*/
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int
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priv_check_cred(kauth_cred_t cred, int priv, int flags)
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{
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#if !CONFIG_MACF
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#pragma unused(priv)
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#endif
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int error;
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/*
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* We first evaluate policies that may deny the granting of
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* privilege unilaterally.
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*/
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#if CONFIG_MACF
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error = mac_priv_check(cred, priv);
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if (error) {
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goto out;
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}
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#endif
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/* Only grant all privileges to root if DEFAULT_UNPRIVELEGED flag is NOT set. */
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if (!(flags & PRIVCHECK_DEFAULT_UNPRIVILEGED_FLAG)) {
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/*
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* Having determined if privilege is restricted by various policies,
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* now determine if privilege is granted. At this point, any policy
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* may grant privilege. For now, we allow short-circuit boolean
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* evaluation, so may not call all policies. Perhaps we should.
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*/
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if (kauth_cred_getuid(cred) == 0) {
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error = 0;
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goto out;
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}
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}
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/*
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* Now check with MAC, if enabled, to see if a policy module grants
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* privilege.
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*/
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#if CONFIG_MACF
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if (mac_priv_grant(cred, priv) == 0) {
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error = 0;
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goto out;
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}
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#endif
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/*
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* The default is deny, so if no policies have granted it, reject
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* with a privilege error here.
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*/
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error = EPERM;
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out:
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return error;
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}
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int
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proc_check_footprint_priv(void)
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{
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return priv_check_cred(kauth_cred_get(), PRIV_VM_FOOTPRINT_LIMIT, 0);
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}
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