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         MAC_PERFORM(pipe_label_init, label);
  84         return (label);
  85 }
  86
  87 void
  88 mac_pipe_label_init(struct pipe *cpipe)
  89 {
  90
  91         cpipe->pipe_label = mac_pipe_label_alloc();
  92 }
  93
  94 void
  95 mac_pipe_label_free(struct label *label)
  96 {
  97
  98         MAC_PERFORM(pipe_label_destroy, label);
  99         mac_labelzone_free(label);
 100 }
 101
 102 void
 103 mac_pipe_label_destroy(struct pipe *cpipe)
 104 {
 105
 106         mac_pipe_label_free(cpipe->pipe_label);
 107         cpipe->pipe_label = NULL;
 108 }
 109
 110 void
 111 mac_pipe_label_copy(struct label *src, struct label *dest)
 112 {
 113
 114         MAC_PERFORM(pipe_label_copy, src, dest);
 115 }
 116
 117 int
 118 mac_pipe_label_externalize(struct label *label, char *elements,
 119     char *outbuf, size_t outbuflen)
 120 {
 121         int error;
 122
 123         error = MAC_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen);
 124
 125         return (error);
 126 }
 127
 128 int
 129 mac_pipe_label_internalize(struct label *label, char *string)
 130 {
 131         int error;
 132
 133         error = MAC_INTERNALIZE(pipe, label, string);
 134
 135         return (error);
 136 }
 137
 138 void
 139 mac_pipe_label_associate(kauth_cred_t cred, struct pipe *cpipe)
 140 {
 141
 142         MAC_PERFORM(pipe_label_associate, cred, cpipe, cpipe->pipe_label);
 143 }
 144
 145 int
 146 mac_pipe_check_kqfilter(kauth_cred_t cred, struct knote *kn,
 147     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 #endif
 156         MAC_CHECK(pipe_check_kqfilter, cred, kn, cpipe, cpipe->pipe_label);
 157         return (error);
 158 }
 159 int
 160 mac_pipe_check_ioctl(kauth_cred_t cred, struct pipe *cpipe, u_int cmd)
 161 {
 162         int error;
 163
 164 #if SECURITY_MAC_CHECK_ENFORCE
 165     /* 21167099 - only check if we allow write */
 166     if (!mac_pipe_enforce)
 167         return (0);
 168 #endif
 169
 170         MAC_CHECK(pipe_check_ioctl, cred, cpipe, cpipe->pipe_label, cmd);
 171
 172         return (error);
 173 }
 174
 175 int
 176 mac_pipe_check_read(kauth_cred_t cred, struct pipe *cpipe)
 177 {
 178         int error;
 179
 180 #if SECURITY_MAC_CHECK_ENFORCE
 181     /* 21167099 - only check if we allow write */
 182     if (!mac_pipe_enforce)
 183         return (0);
 184 #endif
 185
 186         MAC_CHECK(pipe_check_read, cred, cpipe, cpipe->pipe_label);
 187
 188         return (error);
 189 }
 190
 191 static int
 192 mac_pipe_check_label_update(kauth_cred_t cred, struct pipe *cpipe,
 193     struct label *newlabel)
 194 {
 195         int error;
 196
 197 #if SECURITY_MAC_CHECK_ENFORCE
 198     /* 21167099 - only check if we allow write */
 199     if (!mac_pipe_enforce)
 200         return (0);
 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 #endif
 218
 219         MAC_CHECK(pipe_check_select, cred, cpipe, cpipe->pipe_label, which);
 220
 221         return (error);
 222 }
 223
 224 int
 225 mac_pipe_check_stat(kauth_cred_t cred, struct pipe *cpipe)
 226 {
 227         int error;
 228
 229 #if SECURITY_MAC_CHECK_ENFORCE
 230     /* 21167099 - only check if we allow write */
 231     if (!mac_pipe_enforce)
 232         return (0);
 233 #endif
 234
 235         MAC_CHECK(pipe_check_stat, cred, cpipe, cpipe->pipe_label);
 236
 237         return (error);
 238 }
 239
 240 int
 241 mac_pipe_check_write(kauth_cred_t cred, struct pipe *cpipe)
 242 {
 243         int error;
 244
 245 #if SECURITY_MAC_CHECK_ENFORCE
 246     /* 21167099 - only check if we allow write */
 247     if (!mac_pipe_enforce)
 248         return (0);
 249 #endif
 250
 251         MAC_CHECK(pipe_check_write, cred, cpipe, cpipe->pipe_label);
 252
 253         return (error);
 254 }
 255
 256 int
 257 mac_pipe_label_update(kauth_cred_t cred, struct pipe *cpipe,
 258     struct label *label)
 259 {
 260         int error;
 261
 262         error = mac_pipe_check_label_update(cred, cpipe, label);
 263         if (error)
 264                 return (error);
 265
 266         MAC_PERFORM(pipe_label_update, cred, cpipe, cpipe->pipe_label, label);
 267
 268         return (0);
 269 }