security/mac_posix_shm.c

   1 /*
   2  * Copyright (c) 2007 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) 2003-2005 Networks Associates Technology, Inc.
  30  * All rights reserved.
  31  *
  32  * This software was developed for the FreeBSD Project in part by Network
  33  * Associates Laboratories, the Security Research Division of Network
  34  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
  35  * as part of the DARPA CHATS research program.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56  * SUCH DAMAGE.
  57  */
  58
  59 #include <sys/cdefs.h>
  60
  61 #include <sys/param.h>
  62 #include <sys/kernel.h>
  63 #include <sys/lock.h>
  64 #include <sys/malloc.h>
  65 #include <sys/posix_shm.h>
  66 #include <sys/sbuf.h>
  67 #include <sys/systm.h>
  68 #include <sys/sysctl.h>
  69 #include <sys/vnode.h>
  70
  71 #include <security/mac_internal.h>
  72
  73 static struct label *
  74 mac_posixshm_label_alloc(void)
  75 {
  76         struct label *label;
  77
  78         label = mac_labelzone_alloc(MAC_WAITOK);
  79         if (label == NULL)
  80                 return (NULL);
  81         MAC_PERFORM(posixshm_label_init, label);
  82         return (label);
  83 }
  84
  85 void
  86 mac_posixshm_label_init(struct pshminfo *pshm)
  87 {
  88
  89         pshm->pshm_label = mac_posixshm_label_alloc();
  90 }
  91
  92 static void
  93 mac_posixshm_label_free(struct label *label)
  94 {
  95
  96         MAC_PERFORM(posixshm_label_destroy, label);
  97         mac_labelzone_free(label);
  98 }
  99
 100 void
 101 mac_posixshm_label_destroy(struct pshminfo *pshm)
 102 {
 103
 104         mac_posixshm_label_free(pshm->pshm_label);
 105         pshm->pshm_label = NULL;
 106 }
 107
 108 void
 109 mac_posixshm_vnode_label_associate(kauth_cred_t cred,
 110         struct pshminfo *pshm, struct label *plabel,
 111         vnode_t vp, struct label *vlabel)
 112 {
 113         MAC_PERFORM(vnode_label_associate_posixshm, cred,
 114                     pshm, plabel, vp, vlabel);
 115 }
 116
 117 void
 118 mac_posixshm_label_associate(kauth_cred_t cred, struct pshminfo *pshm,
 119     const char *name)
 120 {
 121
 122         MAC_PERFORM(posixshm_label_associate, cred, pshm, pshm->pshm_label, name);
 123 }
 124
 125 int
 126 mac_posixshm_check_create(kauth_cred_t cred, const char *name)
 127 {
 128         int error = 0;
 129
 130 #if SECURITY_MAC_CHECK_ENFORCE
 131     /* 21167099 - only check if we allow write */
 132     if (!mac_posixshm_enforce)
 133         return 0;
 134 #endif
 135
 136         MAC_CHECK(posixshm_check_create, cred, name);
 137
 138         return error;
 139 }
 140
 141 int
 142 mac_posixshm_check_open(kauth_cred_t cred, struct pshminfo *shm, int fflags)
 143 {
 144         int error = 0;
 145
 146 #if SECURITY_MAC_CHECK_ENFORCE
 147     /* 21167099 - only check if we allow write */
 148     if (!mac_posixshm_enforce)
 149         return 0;
 150 #endif
 151
 152         MAC_CHECK(posixshm_check_open, cred, shm, shm->pshm_label, fflags);
 153
 154         return (error);
 155 }
 156
 157 int
 158 mac_posixshm_check_mmap(kauth_cred_t cred, struct pshminfo *shm,
 159     int prot, int flags)
 160 {
 161         int error = 0;
 162
 163 #if SECURITY_MAC_CHECK_ENFORCE
 164     /* 21167099 - only check if we allow write */
 165     if (!mac_posixshm_enforce)
 166         return 0;
 167 #endif
 168
 169         MAC_CHECK(posixshm_check_mmap, cred, shm, shm->pshm_label,
 170             prot, flags);
 171
 172         return (error);
 173 }
 174
 175 int
 176 mac_posixshm_check_stat(kauth_cred_t cred, struct pshminfo *shm)
 177 {
 178         int error = 0;
 179
 180 #if SECURITY_MAC_CHECK_ENFORCE
 181     /* 21167099 - only check if we allow write */
 182     if (!mac_posixshm_enforce)
 183         return 0;
 184 #endif
 185
 186         MAC_CHECK(posixshm_check_stat, cred, shm, shm->pshm_label);
 187
 188         return (error);
 189 }
 190
 191 int
 192 mac_posixshm_check_truncate(kauth_cred_t cred, struct pshminfo *shm,
 193     off_t size)
 194 {
 195         int error = 0;
 196
 197 #if SECURITY_MAC_CHECK_ENFORCE
 198     /* 21167099 - only check if we allow write */
 199     if (!mac_posixshm_enforce)
 200         return 0;
 201 #endif
 202
 203         MAC_CHECK(posixshm_check_truncate, cred, shm, shm->pshm_label, size);
 204
 205         return (error);
 206 }
 207
 208 int
 209 mac_posixshm_check_unlink(kauth_cred_t cred, struct pshminfo *shm,
 210     const char *name)
 211 {
 212         int error = 0;
 213
 214 #if SECURITY_MAC_CHECK_ENFORCE
 215     /* 21167099 - only check if we allow write */
 216     if (!mac_posixshm_enforce)
 217         return 0;
 218 #endif
 219
 220         MAC_CHECK(posixshm_check_unlink, cred, shm, shm->pshm_label, name);
 221
 222         return (error);
 223 }