1/* 2 * Copyright (c) 2010 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/*- 29 * Copyright (c) 2006 nCircle Network Security, Inc. 30 * Copyright (c) 2009 Robert N. M. Watson 31 * All rights reserved. 32 * 33 * This software was developed by Robert N. M. Watson for the TrustedBSD 34 * Project under contract to nCircle Network Security, Inc. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY, 49 * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 50 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 51 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 52 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 53 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 54 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 55 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 56 */ 57 58#include <sys/cdefs.h> 59 60#include <sys/param.h> 61#include <sys/kernel.h> 62#include <sys/priv.h> 63#include <sys/proc.h> 64#include <sys/systm.h> 65#include <sys/kauth.h> 66 67#if CONFIG_MACF 68#include <security/mac_framework.h> 69#endif 70 71int proc_check_footprint_priv(void); 72 73/* 74 * Check a credential for privilege. Lots of good reasons to deny privilege; 75 * only a few to grant it. 76 */ 77int 78priv_check_cred(kauth_cred_t cred, int priv, __unused int flags) 79{ 80#if !CONFIG_MACF 81#pragma unused(priv) 82#endif 83 int error; 84 85 /* 86 * We first evaluate policies that may deny the granting of 87 * privilege unilaterally. 88 */ 89#if CONFIG_MACF 90 error = mac_priv_check(cred, priv); 91 if (error) 92 goto out; 93#endif 94 95 /* 96 * Having determined if privilege is restricted by various policies, 97 * now determine if privilege is granted. At this point, any policy 98 * may grant privilege. For now, we allow short-circuit boolean 99 * evaluation, so may not call all policies. Perhaps we should. 100 */ 101 if (kauth_cred_getuid(cred) == 0) { 102 error = 0; 103 goto out; 104 } 105 106 /* 107 * Now check with MAC, if enabled, to see if a policy module grants 108 * privilege. 109 */ 110#if CONFIG_MACF 111 if (mac_priv_grant(cred, priv) == 0) { 112 error = 0; 113 goto out; 114 } 115#endif 116 117 /* 118 * The default is deny, so if no policies have granted it, reject 119 * with a privilege error here. 120 */ 121 error = EPERM; 122out: 123 return (error); 124} 125 126int 127proc_check_footprint_priv(void) 128{ 129 return (priv_check_cred(kauth_cred_get(), PRIV_VM_FOOTPRINT_LIMIT, 0)); 130} 131