security/mac_sysv_msg.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/systm.h>
  63 #include <sys/kernel.h>
  64 #include <sys/lock.h>
  65 #include <sys/malloc.h>
  66 #include <sys/sbuf.h>
  67 #include <sys/systm.h>
  68 #include <sys/vnode.h>
  69 #include <sys/mount.h>
  70 #include <sys/file.h>
  71 #include <sys/namei.h>
  72 #include <sys/sysctl.h>
  73 #include <sys/msg.h>
  74
  75 #include <security/mac_internal.h>
  76
  77 static struct label *
  78 mac_sysv_msgmsg_label_alloc(void)
  79 {
  80         struct label *label;
  81
  82         label = mac_labelzone_alloc(MAC_WAITOK);
  83         if (label == NULL) {
  84                 return NULL;
  85         }
  86         MAC_PERFORM(sysvmsg_label_init, label);
  87         return label;
  88 }
  89
  90 void
  91 mac_sysvmsg_label_init(struct msg *msgptr)
  92 {
  93         msgptr->label = mac_sysv_msgmsg_label_alloc();
  94 }
  95
  96 static struct label *
  97 mac_sysv_msgqueue_label_alloc(void)
  98 {
  99         struct label *label;
 100
 101         label = mac_labelzone_alloc(MAC_WAITOK);
 102         if (label == NULL) {
 103                 return NULL;
 104         }
 105         MAC_PERFORM(sysvmsq_label_init, label);
 106         return label;
 107 }
 108
 109 void
 110 mac_sysvmsq_label_init(struct msqid_kernel *msqptr)
 111 {
 112         msqptr->label = mac_sysv_msgqueue_label_alloc();
 113 }
 114
 115 void
 116 mac_sysvmsg_label_associate(kauth_cred_t cred, struct msqid_kernel *msqptr,
 117     struct msg *msgptr)
 118 {
 119         MAC_PERFORM(sysvmsg_label_associate, cred, msqptr, msqptr->label,
 120             msgptr, msgptr->label);
 121 }
 122
 123 void
 124 mac_sysvmsq_label_associate(kauth_cred_t cred, struct msqid_kernel *msqptr)
 125 {
 126         MAC_PERFORM(sysvmsq_label_associate, cred, msqptr, msqptr->label);
 127 }
 128
 129 void
 130 mac_sysvmsg_label_recycle(struct msg *msgptr)
 131 {
 132         MAC_PERFORM(sysvmsg_label_recycle, msgptr->label);
 133 }
 134
 135 void
 136 mac_sysvmsq_label_recycle(struct msqid_kernel *msqptr)
 137 {
 138         MAC_PERFORM(sysvmsq_label_recycle, msqptr->label);
 139 }
 140
 141 int
 142 mac_sysvmsq_check_enqueue(kauth_cred_t cred, struct msg *msgptr,
 143     struct msqid_kernel *msqptr)
 144 {
 145         int error;
 146
 147 #if SECURITY_MAC_CHECK_ENFORCE
 148         /* 21167099 - only check if we allow write */
 149         if (!mac_sysvmsg_enforce) {
 150                 return 0;
 151         }
 152 #endif
 153
 154         MAC_CHECK(sysvmsq_check_enqueue, cred, msgptr, msgptr->label, msqptr,
 155             msqptr->label);
 156
 157         return error;
 158 }
 159
 160 int
 161 mac_sysvmsq_check_msgrcv(kauth_cred_t cred, struct msg *msgptr)
 162 {
 163         int error;
 164
 165 #if SECURITY_MAC_CHECK_ENFORCE
 166         /* 21167099 - only check if we allow write */
 167         if (!mac_sysvmsg_enforce) {
 168                 return 0;
 169         }
 170 #endif
 171
 172         MAC_CHECK(sysvmsq_check_msgrcv, cred, msgptr, msgptr->label);
 173
 174         return error;
 175 }
 176
 177 int
 178 mac_sysvmsq_check_msgrmid(kauth_cred_t cred, struct msg *msgptr)
 179 {
 180         int error;
 181
 182 #if SECURITY_MAC_CHECK_ENFORCE
 183         /* 21167099 - only check if we allow write */
 184         if (!mac_sysvmsg_enforce) {
 185                 return 0;
 186         }
 187 #endif
 188
 189         MAC_CHECK(sysvmsq_check_msgrmid, cred, msgptr, msgptr->label);
 190
 191         return error;
 192 }
 193
 194 int
 195 mac_sysvmsq_check_msqget(kauth_cred_t cred, struct msqid_kernel *msqptr)
 196 {
 197         int error;
 198
 199 #if SECURITY_MAC_CHECK_ENFORCE
 200         /* 21167099 - only check if we allow write */
 201         if (!mac_sysvmsg_enforce) {
 202                 return 0;
 203         }
 204 #endif
 205
 206         MAC_CHECK(sysvmsq_check_msqget, cred, msqptr, msqptr->label);
 207
 208         return error;
 209 }
 210
 211 int
 212 mac_sysvmsq_check_msqsnd(kauth_cred_t cred, struct msqid_kernel *msqptr)
 213 {
 214         int error;
 215
 216 #if SECURITY_MAC_CHECK_ENFORCE
 217         /* 21167099 - only check if we allow write */
 218         if (!mac_sysvmsg_enforce) {
 219                 return 0;
 220         }
 221 #endif
 222
 223         MAC_CHECK(sysvmsq_check_msqsnd, cred, msqptr, msqptr->label);
 224
 225         return error;
 226 }
 227
 228 int
 229 mac_sysvmsq_check_msqrcv(kauth_cred_t cred, struct msqid_kernel *msqptr)
 230 {
 231         int error;
 232
 233 #if SECURITY_MAC_CHECK_ENFORCE
 234         /* 21167099 - only check if we allow write */
 235         if (!mac_sysvmsg_enforce) {
 236                 return 0;
 237         }
 238 #endif
 239
 240         MAC_CHECK(sysvmsq_check_msqrcv, cred, msqptr, msqptr->label);
 241
 242         return error;
 243 }
 244
 245 int
 246 mac_sysvmsq_check_msqctl(kauth_cred_t cred, struct msqid_kernel *msqptr,
 247     int cmd)
 248 {
 249         int error;
 250
 251 #if SECURITY_MAC_CHECK_ENFORCE
 252         /* 21167099 - only check if we allow write */
 253         if (!mac_sysvmsg_enforce) {
 254                 return 0;
 255         }
 256 #endif
 257
 258         MAC_CHECK(sysvmsq_check_msqctl, cred, msqptr, msqptr->label, cmd);
 259
 260         return error;
 261 }