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_copy(struct label *src, struct label *dest)
 110 {
 111         MAC_PERFORM(pipe_label_copy, src, dest);
 112 }
 113
 114 int
 115 mac_pipe_label_externalize(struct label *label, char *elements,
 116     char *outbuf, size_t outbuflen)
 117 {
 118         int error;
 119
 120         error = MAC_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen);
 121
 122         return error;
 123 }
 124
 125 int
 126 mac_pipe_label_internalize(struct label *label, char *string)
 127 {
 128         int error;
 129
 130         error = MAC_INTERNALIZE(pipe, label, string);
 131
 132         return error;
 133 }
 134
 135 void
 136 mac_pipe_label_associate(kauth_cred_t cred, struct pipe *cpipe)
 137 {
 138         MAC_PERFORM(pipe_label_associate, cred, cpipe, cpipe->pipe_label);
 139 }
 140
 141 int
 142 mac_pipe_check_kqfilter(kauth_cred_t cred, struct knote *kn,
 143     struct pipe *cpipe)
 144 {
 145         int error;
 146
 147 #if SECURITY_MAC_CHECK_ENFORCE
 148         /* 21167099 - only check if we allow write */
 149         if (!mac_pipe_enforce) {
 150                 return 0;
 151         }
 152 #endif
 153         MAC_CHECK(pipe_check_kqfilter, cred, kn, cpipe, cpipe->pipe_label);
 154         return error;
 155 }
 156 int
 157 mac_pipe_check_ioctl(kauth_cred_t cred, struct pipe *cpipe, u_int cmd)
 158 {
 159         int error;
 160
 161 #if SECURITY_MAC_CHECK_ENFORCE
 162         /* 21167099 - only check if we allow write */
 163         if (!mac_pipe_enforce) {
 164                 return 0;
 165         }
 166 #endif
 167
 168         MAC_CHECK(pipe_check_ioctl, cred, cpipe, cpipe->pipe_label, cmd);
 169
 170         return error;
 171 }
 172
 173 int
 174 mac_pipe_check_read(kauth_cred_t cred, struct pipe *cpipe)
 175 {
 176         int error;
 177
 178 #if SECURITY_MAC_CHECK_ENFORCE
 179         /* 21167099 - only check if we allow write */
 180         if (!mac_pipe_enforce) {
 181                 return 0;
 182         }
 183 #endif
 184
 185         MAC_CHECK(pipe_check_read, cred, cpipe, cpipe->pipe_label);
 186
 187         return error;
 188 }
 189
 190 static int
 191 mac_pipe_check_label_update(kauth_cred_t cred, struct pipe *cpipe,
 192     struct label *newlabel)
 193 {
 194         int error;
 195
 196 #if SECURITY_MAC_CHECK_ENFORCE
 197         /* 21167099 - only check if we allow write */
 198         if (!mac_pipe_enforce) {
 199                 return 0;
 200         }
 201 #endif
 202
 203         MAC_CHECK(pipe_check_label_update, cred, cpipe, cpipe->pipe_label, newlabel);
 204
 205         return error;
 206 }
 207
 208 int
 209 mac_pipe_check_select(kauth_cred_t cred, struct pipe *cpipe, int which)
 210 {
 211         int error;
 212
 213 #if SECURITY_MAC_CHECK_ENFORCE
 214         /* 21167099 - only check if we allow write */
 215         if (!mac_pipe_enforce) {
 216                 return 0;
 217         }
 218 #endif
 219
 220         MAC_CHECK(pipe_check_select, cred, cpipe, cpipe->pipe_label, which);
 221
 222         return error;
 223 }
 224
 225 int
 226 mac_pipe_check_stat(kauth_cred_t cred, struct pipe *cpipe)
 227 {
 228         int error;
 229
 230 #if SECURITY_MAC_CHECK_ENFORCE
 231         /* 21167099 - only check if we allow write */
 232         if (!mac_pipe_enforce) {
 233                 return 0;
 234         }
 235 #endif
 236
 237         MAC_CHECK(pipe_check_stat, cred, cpipe, cpipe->pipe_label);
 238
 239         return error;
 240 }
 241
 242 int
 243 mac_pipe_check_write(kauth_cred_t cred, struct pipe *cpipe)
 244 {
 245         int error;
 246
 247 #if SECURITY_MAC_CHECK_ENFORCE
 248         /* 21167099 - only check if we allow write */
 249         if (!mac_pipe_enforce) {
 250                 return 0;
 251         }
 252 #endif
 253
 254         MAC_CHECK(pipe_check_write, cred, cpipe, cpipe->pipe_label);
 255
 256         return error;
 257 }
 258
 259 int
 260 mac_pipe_label_update(kauth_cred_t cred, struct pipe *cpipe,
 261     struct label *label)
 262 {
 263         int error;
 264
 265         error = mac_pipe_check_label_update(cred, cpipe, label);
 266         if (error) {
 267                 return error;
 268         }
 269
 270         MAC_PERFORM(pipe_label_update, cred, cpipe, cpipe->pipe_label, label);
 271
 272         return 0;
 273 }