1 /*- 2 * Copyright (c) 1999-2002, 2007, 2009 Robert N. M. Watson 3 * Copyright (c) 2001 Ilmar S. Habibulin 4 * Copyright (c) 2001-2004 Networks Associates Technology, Inc. 5 * Copyright (c) 2006 SPARTA, Inc. 6 * Copyright (c) 2008 Apple Inc. 7 * All rights reserved. 8 * 9 * This software was developed by Robert Watson and Ilmar Habibulin for the 10 * TrustedBSD Project. 11 * 12 * This software was developed for the FreeBSD Project in part by Network 13 * Associates Laboratories, the Security Research Division of Network 14 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 15 * as part of the DARPA CHATS research program. 16 * 17 * This software was enhanced by SPARTA ISSO under SPAWAR contract 18 * N66001-04-C-6019 ("SEFOS"). 19 * 20 * This software was developed at the University of Cambridge Computer 21 * Laboratory with support from a grant from Google, Inc. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the above copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 */ 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include "opt_kdtrace.h" 49 #include "opt_mac.h" 50 51 #include <sys/param.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/mutex.h> 56 #include <sys/sbuf.h> 57 #include <sys/sdt.h> 58 #include <sys/systm.h> 59 #include <sys/mount.h> 60 #include <sys/file.h> 61 #include <sys/namei.h> 62 #include <sys/protosw.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/sysctl.h> 66 67 #include <net/if.h> 68 #include <net/if_var.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_pcb.h> 72 #include <netinet/ip_var.h> 73 74 #include <security/mac/mac_framework.h> 75 #include <security/mac/mac_internal.h> 76 #include <security/mac/mac_policy.h> 77 78 static struct label * 79 mac_inpcb_label_alloc(int flag) 80 { 81 struct label *label; 82 int error; 83 84 label = mac_labelzone_alloc(flag); 85 if (label == NULL) 86 return (NULL); 87 if (flag & M_WAITOK) 88 MAC_POLICY_CHECK(inpcb_init_label, label, flag); 89 else 90 MAC_POLICY_CHECK_NOSLEEP(inpcb_init_label, label, flag); 91 if (error) { 92 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label); 93 mac_labelzone_free(label); 94 return (NULL); 95 } 96 return (label); 97 } 98 99 int 100 mac_inpcb_init(struct inpcb *inp, int flag) 101 { 102 103 if (mac_labeled & MPC_OBJECT_INPCB) { 104 inp->inp_label = mac_inpcb_label_alloc(flag); 105 if (inp->inp_label == NULL) 106 return (ENOMEM); 107 } else 108 inp->inp_label = NULL; 109 return (0); 110 } 111 112 static struct label * 113 mac_ipq_label_alloc(int flag) 114 { 115 struct label *label; 116 int error; 117 118 label = mac_labelzone_alloc(flag); 119 if (label == NULL) 120 return (NULL); 121 122 if (flag & M_WAITOK) 123 MAC_POLICY_CHECK(ipq_init_label, label, flag); 124 else 125 MAC_POLICY_CHECK_NOSLEEP(ipq_init_label, label, flag); 126 if (error) { 127 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label); 128 mac_labelzone_free(label); 129 return (NULL); 130 } 131 return (label); 132 } 133 134 int 135 mac_ipq_init(struct ipq *q, int flag) 136 { 137 138 if (mac_labeled & MPC_OBJECT_IPQ) { 139 q->ipq_label = mac_ipq_label_alloc(flag); 140 if (q->ipq_label == NULL) 141 return (ENOMEM); 142 } else 143 q->ipq_label = NULL; 144 return (0); 145 } 146 147 static void 148 mac_inpcb_label_free(struct label *label) 149 { 150 151 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label); 152 mac_labelzone_free(label); 153 } 154 155 void 156 mac_inpcb_destroy(struct inpcb *inp) 157 { 158 159 if (inp->inp_label != NULL) { 160 mac_inpcb_label_free(inp->inp_label); 161 inp->inp_label = NULL; 162 } 163 } 164 165 static void 166 mac_ipq_label_free(struct label *label) 167 { 168 169 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label); 170 mac_labelzone_free(label); 171 } 172 173 void 174 mac_ipq_destroy(struct ipq *q) 175 { 176 177 if (q->ipq_label != NULL) { 178 mac_ipq_label_free(q->ipq_label); 179 q->ipq_label = NULL; 180 } 181 } 182 183 void 184 mac_inpcb_create(struct socket *so, struct inpcb *inp) 185 { 186 187 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create, so, so->so_label, inp, 188 inp->inp_label); 189 } 190 191 void 192 mac_ipq_reassemble(struct ipq *q, struct mbuf *m) 193 { 194 struct label *label; 195 196 label = mac_mbuf_to_label(m); 197 198 MAC_POLICY_PERFORM_NOSLEEP(ipq_reassemble, q, q->ipq_label, m, 199 label); 200 } 201 202 void 203 mac_netinet_fragment(struct mbuf *m, struct mbuf *frag) 204 { 205 struct label *mlabel, *fraglabel; 206 207 mlabel = mac_mbuf_to_label(m); 208 fraglabel = mac_mbuf_to_label(frag); 209 210 MAC_POLICY_PERFORM_NOSLEEP(netinet_fragment, m, mlabel, frag, 211 fraglabel); 212 } 213 214 void 215 mac_ipq_create(struct mbuf *m, struct ipq *q) 216 { 217 struct label *label; 218 219 label = mac_mbuf_to_label(m); 220 221 MAC_POLICY_PERFORM_NOSLEEP(ipq_create, m, label, q, q->ipq_label); 222 } 223 224 void 225 mac_inpcb_create_mbuf(struct inpcb *inp, struct mbuf *m) 226 { 227 struct label *mlabel; 228 229 INP_LOCK_ASSERT(inp); 230 mlabel = mac_mbuf_to_label(m); 231 232 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create_mbuf, inp, inp->inp_label, m, 233 mlabel); 234 } 235 236 int 237 mac_ipq_match(struct mbuf *m, struct ipq *q) 238 { 239 struct label *label; 240 int result; 241 242 label = mac_mbuf_to_label(m); 243 244 result = 1; 245 MAC_POLICY_BOOLEAN_NOSLEEP(ipq_match, &&, m, label, q, q->ipq_label); 246 247 return (result); 248 } 249 250 void 251 mac_netinet_arp_send(struct ifnet *ifp, struct mbuf *m) 252 { 253 struct label *mlabel; 254 255 mlabel = mac_mbuf_to_label(m); 256 257 MAC_IFNET_LOCK(ifp); 258 MAC_POLICY_PERFORM_NOSLEEP(netinet_arp_send, ifp, ifp->if_label, m, 259 mlabel); 260 MAC_IFNET_UNLOCK(ifp); 261 } 262 263 void 264 mac_netinet_icmp_reply(struct mbuf *mrecv, struct mbuf *msend) 265 { 266 struct label *mrecvlabel, *msendlabel; 267 268 mrecvlabel = mac_mbuf_to_label(mrecv); 269 msendlabel = mac_mbuf_to_label(msend); 270 271 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_reply, mrecv, mrecvlabel, 272 msend, msendlabel); 273 } 274 275 void 276 mac_netinet_icmp_replyinplace(struct mbuf *m) 277 { 278 struct label *label; 279 280 label = mac_mbuf_to_label(m); 281 282 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_replyinplace, m, label); 283 } 284 285 void 286 mac_netinet_igmp_send(struct ifnet *ifp, struct mbuf *m) 287 { 288 struct label *mlabel; 289 290 mlabel = mac_mbuf_to_label(m); 291 292 MAC_IFNET_LOCK(ifp); 293 MAC_POLICY_PERFORM_NOSLEEP(netinet_igmp_send, ifp, ifp->if_label, m, 294 mlabel); 295 MAC_IFNET_UNLOCK(ifp); 296 } 297 298 void 299 mac_netinet_tcp_reply(struct mbuf *m) 300 { 301 struct label *label; 302 303 label = mac_mbuf_to_label(m); 304 305 MAC_POLICY_PERFORM_NOSLEEP(netinet_tcp_reply, m, label); 306 } 307 308 void 309 mac_ipq_update(struct mbuf *m, struct ipq *q) 310 { 311 struct label *label; 312 313 label = mac_mbuf_to_label(m); 314 315 MAC_POLICY_PERFORM_NOSLEEP(ipq_update, m, label, q, q->ipq_label); 316 } 317 318 MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *", 319 "struct mbuf *"); 320 321 int 322 mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m) 323 { 324 struct label *label; 325 int error; 326 327 M_ASSERTPKTHDR(m); 328 329 label = mac_mbuf_to_label(m); 330 331 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_deliver, inp, inp->inp_label, m, 332 label); 333 MAC_CHECK_PROBE2(inpcb_check_deliver, error, inp, m); 334 335 return (error); 336 } 337 338 MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *", 339 "struct inpcb *"); 340 341 int 342 mac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp) 343 { 344 int error; 345 346 INP_LOCK_ASSERT(inp); 347 348 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_visible, cred, inp, 349 inp->inp_label); 350 MAC_CHECK_PROBE2(inpcb_check_visible, error, cred, inp); 351 352 return (error); 353 } 354 355 void 356 mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp) 357 { 358 359 INP_WLOCK_ASSERT(inp); 360 SOCK_LOCK_ASSERT(so); 361 362 MAC_POLICY_PERFORM_NOSLEEP(inpcb_sosetlabel, so, so->so_label, inp, 363 inp->inp_label); 364 } 365 366 void 367 mac_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend) 368 { 369 struct label *mrecvlabel, *msendlabel; 370 371 M_ASSERTPKTHDR(mrecv); 372 M_ASSERTPKTHDR(msend); 373 374 mrecvlabel = mac_mbuf_to_label(mrecv); 375 msendlabel = mac_mbuf_to_label(msend); 376 377 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_reply, mrecv, mrecvlabel, 378 msend, msendlabel); 379 } 380 381 void 382 mac_netinet_firewall_send(struct mbuf *m) 383 { 384 struct label *label; 385 386 M_ASSERTPKTHDR(m); 387 388 label = mac_mbuf_to_label(m); 389 390 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_send, m, label); 391 } 392 393 /* 394 * These functions really should be referencing the syncache structure 395 * instead of the label. However, due to some of the complexities associated 396 * with exposing this syncache structure we operate directly on it's label 397 * pointer. This should be OK since we aren't making any access control 398 * decisions within this code directly, we are merely allocating and copying 399 * label storage so we can properly initialize mbuf labels for any packets 400 * the syncache code might create. 401 */ 402 void 403 mac_syncache_destroy(struct label **label) 404 { 405 406 if (*label != NULL) { 407 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, *label); 408 mac_labelzone_free(*label); 409 *label = NULL; 410 } 411 } 412 413 int 414 mac_syncache_init(struct label **label) 415 { 416 int error; 417 418 if (mac_labeled & MPC_OBJECT_SYNCACHE) { 419 *label = mac_labelzone_alloc(M_NOWAIT); 420 if (*label == NULL) 421 return (ENOMEM); 422 /* 423 * Since we are holding the inpcb locks the policy can not 424 * allocate policy specific label storage using M_WAITOK. So 425 * we need to do a MAC_CHECK instead of the typical 426 * MAC_PERFORM so we can propagate allocation failures back 427 * to the syncache code. 428 */ 429 MAC_POLICY_CHECK_NOSLEEP(syncache_init_label, *label, 430 M_NOWAIT); 431 if (error) { 432 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, 433 *label); 434 mac_labelzone_free(*label); 435 } 436 return (error); 437 } else 438 *label = NULL; 439 return (0); 440 } 441 442 void 443 mac_syncache_create(struct label *label, struct inpcb *inp) 444 { 445 446 INP_WLOCK_ASSERT(inp); 447 448 MAC_POLICY_PERFORM_NOSLEEP(syncache_create, label, inp); 449 } 450 451 void 452 mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m) 453 { 454 struct label *mlabel; 455 456 M_ASSERTPKTHDR(m); 457 458 mlabel = mac_mbuf_to_label(m); 459 460 MAC_POLICY_PERFORM_NOSLEEP(syncache_create_mbuf, sc_label, m, 461 mlabel); 462 } 463