security/mac_sysv_sem.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) 2003-2004 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/sbuf.h>
  66 #include <sys/systm.h>
  67 #include <sys/vnode.h>
  68 #include <sys/mount.h>
  69 #include <sys/file.h>
  70 #include <sys/namei.h>
  71 #include <sys/sysctl.h>
  72 #include <sys/sem.h>
  73 #include <sys/sem_internal.h>
  74
  75 #include <security/mac_internal.h>
  76
  77
  78 static struct label *
  79 mac_sysv_sem_label_alloc(void)
  80 {
  81         struct label *label;
  82
  83         label = mac_labelzone_alloc(MAC_WAITOK);
  84         if (label == NULL) {
  85                 return NULL;
  86         }
  87         MAC_PERFORM(sysvsem_label_init, label);
  88         return label;
  89 }
  90
  91 void
  92 mac_sysvsem_label_init(struct semid_kernel *semakptr)
  93 {
  94         semakptr->label = mac_sysv_sem_label_alloc();
  95 }
  96
  97 static void
  98 mac_sysv_sem_label_free(struct label *label)
  99 {
 100         MAC_PERFORM(sysvsem_label_destroy, label);
 101         mac_labelzone_free(label);
 102 }
 103
 104 void
 105 mac_sysvsem_label_destroy(struct semid_kernel *semakptr)
 106 {
 107         mac_sysv_sem_label_free(semakptr->label);
 108         semakptr->label = NULL;
 109 }
 110
 111 void
 112 mac_sysvsem_label_associate(kauth_cred_t cred, struct semid_kernel *semakptr)
 113 {
 114         MAC_PERFORM(sysvsem_label_associate, cred, semakptr, semakptr->label);
 115 }
 116
 117 void
 118 mac_sysvsem_label_recycle(struct semid_kernel *semakptr)
 119 {
 120         MAC_PERFORM(sysvsem_label_recycle, semakptr->label);
 121 }
 122
 123 int
 124 mac_sysvsem_check_semctl(kauth_cred_t cred, struct semid_kernel *semakptr,
 125     int cmd)
 126 {
 127         int error;
 128
 129 #if SECURITY_MAC_CHECK_ENFORCE
 130         /* 21167099 - only check if we allow write */
 131         if (!mac_sysvsem_enforce) {
 132                 return 0;
 133         }
 134 #endif
 135
 136         MAC_CHECK(sysvsem_check_semctl, cred, semakptr, semakptr->label, cmd);
 137
 138         return error;
 139 }
 140
 141 int
 142 mac_sysvsem_check_semget(kauth_cred_t cred, struct semid_kernel *semakptr)
 143 {
 144         int error;
 145
 146 #if SECURITY_MAC_CHECK_ENFORCE
 147         /* 21167099 - only check if we allow write */
 148         if (!mac_sysvsem_enforce) {
 149                 return 0;
 150         }
 151 #endif
 152
 153         MAC_CHECK(sysvsem_check_semget, cred, semakptr, semakptr->label);
 154
 155         return error;
 156 }
 157
 158 int
 159 mac_sysvsem_check_semop(kauth_cred_t cred, struct semid_kernel *semakptr,
 160     size_t accesstype)
 161 {
 162         int error;
 163
 164 #if SECURITY_MAC_CHECK_ENFORCE
 165         /* 21167099 - only check if we allow write */
 166         if (!mac_sysvsem_enforce) {
 167                 return 0;
 168         }
 169 #endif
 170
 171         MAC_CHECK(sysvsem_check_semop, cred, semakptr, semakptr->label,
 172             accesstype);
 173
 174         return error;
 175 }