security/mac_pipe.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) 2002, 2003 Networks Associates Technology, Inc.
  30  * Copyright (c) 2005 SPARTA, Inc.
  31  * All rights reserved.
  32  *
  33  * This software was developed for the FreeBSD Project in part by Network
  34  * Associates Laboratories, the Security Research Division of Network
  35  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
  36  * as part of the DARPA CHATS research program.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  */
  59
  60 #include <sys/cdefs.h>
  61
  62 #include <sys/param.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/pipe.h>
  70 #include <sys/sysctl.h>
  71
  72 #include <security/mac_internal.h>
  73
  74
  75 struct label *
  76 mac_pipe_label_alloc(void)
  77 {
  78         struct label *label;
  79
  80         label = mac_labelzone_alloc(MAC_WAITOK);
  81         if (label == NULL) {
  82                 return NULL;
  83         }
  84         MAC_PERFORM(pipe_label_init, label);
  85         return label;
  86 }
  87
  88 void
  89 mac_pipe_label_init(struct pipe *cpipe)
  90 {
  91         cpipe->pipe_label = mac_pipe_label_alloc();
  92 }
  93
  94 void
  95 mac_pipe_label_free(struct label *label)
  96 {
  97         MAC_PERFORM(pipe_label_destroy, label);
  98         mac_labelzone_free(label);
  99 }
 100
 101 void
 102 mac_pipe_label_destroy(struct pipe *cpipe)
 103 {
 104         mac_pipe_label_free(cpipe->pipe_label);
 105         cpipe->pipe_label = NULL;
 106 }
 107
 108 void
 109 mac_pipe_label_associate(kauth_cred_t cred, struct pipe *cpipe)
 110 {
 111         MAC_PERFORM(pipe_label_associate, cred, cpipe, cpipe->pipe_label);
 112 }
 113
 114 int
 115 mac_pipe_check_kqfilter(kauth_cred_t cred, struct knote *kn,
 116     struct pipe *cpipe)
 117 {
 118         int error;
 119
 120 #if SECURITY_MAC_CHECK_ENFORCE
 121         /* 21167099 - only check if we allow write */
 122         if (!mac_pipe_enforce) {
 123                 return 0;
 124         }
 125 #endif
 126         MAC_CHECK(pipe_check_kqfilter, cred, kn, cpipe, cpipe->pipe_label);
 127         return error;
 128 }
 129 int
 130 mac_pipe_check_ioctl(kauth_cred_t cred, struct pipe *cpipe, u_long cmd)
 131 {
 132         int error;
 133
 134 #if SECURITY_MAC_CHECK_ENFORCE
 135         /* 21167099 - only check if we allow write */
 136         if (!mac_pipe_enforce) {
 137                 return 0;
 138         }
 139 #endif
 140
 141         MAC_CHECK(pipe_check_ioctl, cred, cpipe, cpipe->pipe_label, cmd);
 142
 143         return error;
 144 }
 145
 146 int
 147 mac_pipe_check_read(kauth_cred_t cred, struct pipe *cpipe)
 148 {
 149         int error;
 150
 151 #if SECURITY_MAC_CHECK_ENFORCE
 152         /* 21167099 - only check if we allow write */
 153         if (!mac_pipe_enforce) {
 154                 return 0;
 155         }
 156 #endif
 157
 158         MAC_CHECK(pipe_check_read, cred, cpipe, cpipe->pipe_label);
 159
 160         return error;
 161 }
 162
 163 int
 164 mac_pipe_check_select(kauth_cred_t cred, struct pipe *cpipe, int which)
 165 {
 166         int error;
 167
 168 #if SECURITY_MAC_CHECK_ENFORCE
 169         /* 21167099 - only check if we allow write */
 170         if (!mac_pipe_enforce) {
 171                 return 0;
 172         }
 173 #endif
 174
 175         MAC_CHECK(pipe_check_select, cred, cpipe, cpipe->pipe_label, which);
 176
 177         return error;
 178 }
 179
 180 int
 181 mac_pipe_check_stat(kauth_cred_t cred, struct pipe *cpipe)
 182 {
 183         int error;
 184
 185 #if SECURITY_MAC_CHECK_ENFORCE
 186         /* 21167099 - only check if we allow write */
 187         if (!mac_pipe_enforce) {
 188                 return 0;
 189         }
 190 #endif
 191
 192         MAC_CHECK(pipe_check_stat, cred, cpipe, cpipe->pipe_label);
 193
 194         return error;
 195 }
 196
 197 int
 198 mac_pipe_check_write(kauth_cred_t cred, struct pipe *cpipe)
 199 {
 200         int error;
 201
 202 #if SECURITY_MAC_CHECK_ENFORCE
 203         /* 21167099 - only check if we allow write */
 204         if (!mac_pipe_enforce) {
 205                 return 0;
 206         }
 207 #endif
 208
 209         MAC_CHECK(pipe_check_write, cred, cpipe, cpipe->pipe_label);
 210
 211         return error;
 212 }