security/mac_inet.c

   1 /*
   2  * Copyright (c) 2007-2011 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) 1999-2002 Robert N. M. Watson
  30  * Copyright (c) 2001 Ilmar S. Habibulin
  31  * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
  32  * Copyright (c) 2006-2007 SPARTA, Inc.
  33  * All rights reserved.
  34  *
  35  * This software was developed by Robert Watson and Ilmar Habibulin for the
  36  * TrustedBSD Project.
  37  *
  38  * This software was developed for the FreeBSD Project in part by Network
  39  * Associates Laboratories, the Security Research Division of Network
  40  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
  41  * as part of the DARPA CHATS research program.
  42  *
  43  * This software was enhanced by SPARTA ISSO under SPAWAR contract
  44  * N66001-04-C-6019 ("SEFOS").
  45  *
  46  * Redistribution and use in source and binary forms, with or without
  47  * modification, are permitted provided that the following conditions
  48  * are met:
  49  * 1. Redistributions of source code must retain the above copyright
  50  *    notice, this list of conditions and the following disclaimer.
  51  * 2. Redistributions in binary form must reproduce the above copyright
  52  *    notice, this list of conditions and the following disclaimer in the
  53  *    documentation and/or other materials provided with the distribution.
  54  *
  55  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  65  * SUCH DAMAGE.
  66  */
  67
  68 #include <sys/param.h>
  69 #include <sys/kernel.h>
  70 #include <sys/mbuf.h>
  71 #include <sys/socket.h>
  72 #include <sys/socketvar.h>
  73
  74 #include <net/route.h>
  75
  76 #include <netinet/in.h>
  77 #include <netinet/in_pcb.h>
  78 #include <netinet/ip_var.h>
  79
  80 #include <security/mac_internal.h>
  81
  82 static struct label *
  83 mac_inpcb_label_alloc(int flag)
  84 {
  85         struct label *label;
  86         int error;
  87
  88         label = mac_labelzone_alloc(flag);
  89         if (label == NULL) {
  90                 return NULL;
  91         }
  92         MAC_CHECK(inpcb_label_init, label, flag);
  93         if (error) {
  94                 MAC_PERFORM(inpcb_label_destroy, label);
  95                 mac_labelzone_free(label);
  96                 return NULL;
  97         }
  98         return label;
  99 }
 100
 101 int
 102 mac_inpcb_label_init(struct inpcb *inp, int flag)
 103 {
 104         inp->inp_label = mac_inpcb_label_alloc(flag);
 105         if (inp->inp_label == NULL) {
 106                 return ENOMEM;
 107         }
 108         return 0;
 109 }
 110
 111 static struct label *
 112 mac_ipq_label_alloc(int flag)
 113 {
 114         struct label *label;
 115         int error;
 116
 117         label = mac_labelzone_alloc(flag);
 118         if (label == NULL) {
 119                 return NULL;
 120         }
 121
 122         MAC_CHECK(ipq_label_init, label, flag);
 123         if (error) {
 124                 MAC_PERFORM(ipq_label_destroy, label);
 125                 mac_labelzone_free(label);
 126                 return NULL;
 127         }
 128         return label;
 129 }
 130
 131 int
 132 mac_ipq_label_init(struct ipq *ipq, int flag)
 133 {
 134         ipq->ipq_label = mac_ipq_label_alloc(flag);
 135         if (ipq->ipq_label == NULL) {
 136                 return ENOMEM;
 137         }
 138         return 0;
 139 }
 140
 141 static void
 142 mac_inpcb_label_free(struct label *label)
 143 {
 144         MAC_PERFORM(inpcb_label_destroy, label);
 145         mac_labelzone_free(label);
 146 }
 147
 148 void
 149 mac_inpcb_label_destroy(struct inpcb *inp)
 150 {
 151         mac_inpcb_label_free(inp->inp_label);
 152         inp->inp_label = NULL;
 153 }
 154
 155 void
 156 mac_inpcb_label_recycle(struct inpcb *inp)
 157 {
 158         MAC_PERFORM(inpcb_label_recycle, inp->inp_label);
 159 }
 160
 161 static void
 162 mac_ipq_label_free(struct label *label)
 163 {
 164         MAC_PERFORM(ipq_label_destroy, label);
 165         mac_labelzone_free(label);
 166 }
 167
 168 void
 169 mac_ipq_label_destroy(struct ipq *ipq)
 170 {
 171         mac_ipq_label_free(ipq->ipq_label);
 172         ipq->ipq_label = NULL;
 173 }
 174
 175 void
 176 mac_inpcb_label_associate(struct socket *so, struct inpcb *inp)
 177 {
 178         MAC_PERFORM(inpcb_label_associate, so, so->so_label, inp,
 179             inp->inp_label);
 180 }
 181
 182 void
 183 mac_mbuf_label_associate_ipq(struct ipq *ipq, struct mbuf *m)
 184 {
 185         struct label *label;
 186
 187         label = mac_mbuf_to_label(m);
 188
 189         MAC_PERFORM(mbuf_label_associate_ipq, ipq, ipq->ipq_label, m, label);
 190 }
 191
 192 void
 193 mac_netinet_fragment(struct mbuf *datagram, struct mbuf *fragment)
 194 {
 195         struct label *datagramlabel, *fragmentlabel;
 196
 197         datagramlabel = mac_mbuf_to_label(datagram);
 198         fragmentlabel = mac_mbuf_to_label(fragment);
 199
 200         MAC_PERFORM(netinet_fragment, datagram, datagramlabel, fragment,
 201             fragmentlabel);
 202 }
 203
 204 void
 205 mac_ipq_label_associate(struct mbuf *fragment, struct ipq *ipq)
 206 {
 207         struct label *label;
 208
 209         label = mac_mbuf_to_label(fragment);
 210
 211         MAC_PERFORM(ipq_label_associate, fragment, label, ipq, ipq->ipq_label);
 212 }
 213
 214 void
 215 mac_mbuf_label_associate_inpcb(struct inpcb *inp, struct mbuf *m)
 216 {
 217         struct label *mlabel;
 218
 219         /* INP_LOCK_ASSERT(inp); */
 220         mlabel = mac_mbuf_to_label(m);
 221
 222         MAC_PERFORM(mbuf_label_associate_inpcb, inp, inp->inp_label, m, mlabel);
 223 }
 224
 225 int
 226 mac_ipq_label_compare(struct mbuf *fragment, struct ipq *ipq)
 227 {
 228         struct label *label;
 229         int result;
 230
 231         label = mac_mbuf_to_label(fragment);
 232
 233         result = 1;
 234         MAC_BOOLEAN(ipq_label_compare, &&, fragment, label, ipq, ipq->ipq_label);
 235
 236         return result;
 237 }
 238
 239 void
 240 mac_netinet_icmp_reply(struct mbuf *m)
 241 {
 242         struct label *label;
 243
 244         label = mac_mbuf_to_label(m);
 245
 246         MAC_PERFORM(netinet_icmp_reply, m, label);
 247 }
 248
 249 void
 250 mac_netinet_tcp_reply(struct mbuf *m)
 251 {
 252         struct label *label;
 253
 254         label = mac_mbuf_to_label(m);
 255
 256         MAC_PERFORM(netinet_tcp_reply, m, label);
 257 }
 258
 259 void
 260 mac_ipq_label_update(struct mbuf *fragment, struct ipq *ipq)
 261 {
 262         struct label *label;
 263
 264         label = mac_mbuf_to_label(fragment);
 265
 266         MAC_PERFORM(ipq_label_update, fragment, label, ipq, ipq->ipq_label);
 267 }
 268
 269 int
 270 mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m, int family, int type)
 271 {
 272         struct label *label;
 273         int error;
 274
 275         if ((m->m_flags & M_PKTHDR) == 0) {
 276                 panic("%s: no mbuf packet header!", __func__);
 277         }
 278
 279         label = mac_mbuf_to_label(m);
 280
 281         MAC_CHECK(inpcb_check_deliver, inp, inp->inp_label, m, label,
 282             family, type);
 283
 284         return error;
 285 }
 286
 287 /*
 288  * Propagate a change in the socket label to the inpcb label.
 289  */
 290 void
 291 mac_inpcb_label_update(struct socket *so)
 292 {
 293         struct inpcb *inp;
 294
 295         /* XXX: assert socket lock. */
 296         inp = sotoinpcb(so);    /* XXX: inp locking */
 297
 298         if (inp != NULL) {
 299                 /* INP_LOCK_ASSERT(inp); */
 300                 MAC_PERFORM(inpcb_label_update, so, so->so_label, inp,
 301                     inp->inp_label);
 302         }
 303 }