1 /*- 2 * Copyright (c) 1999-2002, 2007, 2009, 2019 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_mac.h" 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <sys/lock.h> 53 #include <sys/malloc.h> 54 #include <sys/mutex.h> 55 #include <sys/sbuf.h> 56 #include <sys/sdt.h> 57 #include <sys/systm.h> 58 #include <sys/mount.h> 59 #include <sys/file.h> 60 #include <sys/namei.h> 61 #include <sys/protosw.h> 62 #include <sys/socket.h> 63 #include <sys/socketvar.h> 64 #include <sys/sysctl.h> 65 66 #include <net/if.h> 67 #include <net/if_var.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_pcb.h> 71 #include <netinet/ip_var.h> 72 73 #include <security/mac/mac_framework.h> 74 #include <security/mac/mac_internal.h> 75 #include <security/mac/mac_policy.h> 76 77 static struct label * 78 mac_inpcb_label_alloc(int flag) 79 { 80 struct label *label; 81 int error; 82 83 label = mac_labelzone_alloc(flag); 84 if (label == NULL) 85 return (NULL); 86 if (flag & M_WAITOK) 87 MAC_POLICY_CHECK(inpcb_init_label, label, flag); 88 else 89 MAC_POLICY_CHECK_NOSLEEP(inpcb_init_label, label, flag); 90 if (error) { 91 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label); 92 mac_labelzone_free(label); 93 return (NULL); 94 } 95 return (label); 96 } 97 98 int 99 mac_inpcb_init(struct inpcb *inp, int flag) 100 { 101 102 if (mac_labeled & MPC_OBJECT_INPCB) { 103 inp->inp_label = mac_inpcb_label_alloc(flag); 104 if (inp->inp_label == NULL) 105 return (ENOMEM); 106 } else 107 inp->inp_label = NULL; 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 if (flag & M_WAITOK) 122 MAC_POLICY_CHECK(ipq_init_label, label, flag); 123 else 124 MAC_POLICY_CHECK_NOSLEEP(ipq_init_label, label, flag); 125 if (error) { 126 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label); 127 mac_labelzone_free(label); 128 return (NULL); 129 } 130 return (label); 131 } 132 133 int 134 mac_ipq_init(struct ipq *q, int flag) 135 { 136 137 if (mac_labeled & MPC_OBJECT_IPQ) { 138 q->ipq_label = mac_ipq_label_alloc(flag); 139 if (q->ipq_label == NULL) 140 return (ENOMEM); 141 } else 142 q->ipq_label = NULL; 143 return (0); 144 } 145 146 static void 147 mac_inpcb_label_free(struct label *label) 148 { 149 150 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label); 151 mac_labelzone_free(label); 152 } 153 154 void 155 mac_inpcb_destroy(struct inpcb *inp) 156 { 157 158 if (inp->inp_label != NULL) { 159 mac_inpcb_label_free(inp->inp_label); 160 inp->inp_label = NULL; 161 } 162 } 163 164 static void 165 mac_ipq_label_free(struct label *label) 166 { 167 168 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label); 169 mac_labelzone_free(label); 170 } 171 172 void 173 mac_ipq_destroy(struct ipq *q) 174 { 175 176 if (q->ipq_label != NULL) { 177 mac_ipq_label_free(q->ipq_label); 178 q->ipq_label = NULL; 179 } 180 } 181 182 void 183 mac_inpcb_create(struct socket *so, struct inpcb *inp) 184 { 185 186 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create, so, so->so_label, inp, 187 inp->inp_label); 188 } 189 190 void 191 mac_ipq_reassemble(struct ipq *q, struct mbuf *m) 192 { 193 struct label *label; 194 195 if (mac_policy_count == 0) 196 return; 197 198 label = mac_mbuf_to_label(m); 199 200 MAC_POLICY_PERFORM_NOSLEEP(ipq_reassemble, q, q->ipq_label, m, 201 label); 202 } 203 204 void 205 mac_netinet_fragment(struct mbuf *m, struct mbuf *frag) 206 { 207 struct label *mlabel, *fraglabel; 208 209 if (mac_policy_count == 0) 210 return; 211 212 mlabel = mac_mbuf_to_label(m); 213 fraglabel = mac_mbuf_to_label(frag); 214 215 MAC_POLICY_PERFORM_NOSLEEP(netinet_fragment, m, mlabel, frag, 216 fraglabel); 217 } 218 219 void 220 mac_ipq_create(struct mbuf *m, struct ipq *q) 221 { 222 struct label *label; 223 224 if (mac_policy_count == 0) 225 return; 226 227 label = mac_mbuf_to_label(m); 228 229 MAC_POLICY_PERFORM_NOSLEEP(ipq_create, m, label, q, q->ipq_label); 230 } 231 232 void 233 mac_inpcb_create_mbuf(struct inpcb *inp, struct mbuf *m) 234 { 235 struct label *mlabel; 236 237 INP_LOCK_ASSERT(inp); 238 239 if (mac_policy_count == 0) 240 return; 241 242 mlabel = mac_mbuf_to_label(m); 243 244 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create_mbuf, inp, inp->inp_label, m, 245 mlabel); 246 } 247 248 int 249 mac_ipq_match(struct mbuf *m, struct ipq *q) 250 { 251 struct label *label; 252 int result; 253 254 if (mac_policy_count == 0) 255 return (1); 256 257 label = mac_mbuf_to_label(m); 258 259 result = 1; 260 MAC_POLICY_BOOLEAN_NOSLEEP(ipq_match, &&, m, label, q, q->ipq_label); 261 262 return (result); 263 } 264 265 void 266 mac_netinet_arp_send(struct ifnet *ifp, struct mbuf *m) 267 { 268 struct label *mlabel; 269 int locked; 270 271 if (mac_policy_count == 0) 272 return; 273 274 mlabel = mac_mbuf_to_label(m); 275 276 MAC_IFNET_LOCK(ifp, locked); 277 MAC_POLICY_PERFORM_NOSLEEP(netinet_arp_send, ifp, ifp->if_label, m, 278 mlabel); 279 MAC_IFNET_UNLOCK(ifp, locked); 280 } 281 282 void 283 mac_netinet_icmp_reply(struct mbuf *mrecv, struct mbuf *msend) 284 { 285 struct label *mrecvlabel, *msendlabel; 286 287 if (mac_policy_count == 0) 288 return; 289 290 mrecvlabel = mac_mbuf_to_label(mrecv); 291 msendlabel = mac_mbuf_to_label(msend); 292 293 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_reply, mrecv, mrecvlabel, 294 msend, msendlabel); 295 } 296 297 void 298 mac_netinet_icmp_replyinplace(struct mbuf *m) 299 { 300 struct label *label; 301 302 if (mac_policy_count == 0) 303 return; 304 305 label = mac_mbuf_to_label(m); 306 307 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_replyinplace, m, label); 308 } 309 310 void 311 mac_netinet_igmp_send(struct ifnet *ifp, struct mbuf *m) 312 { 313 struct label *mlabel; 314 int locked; 315 316 if (mac_policy_count == 0) 317 return; 318 319 mlabel = mac_mbuf_to_label(m); 320 321 MAC_IFNET_LOCK(ifp, locked); 322 MAC_POLICY_PERFORM_NOSLEEP(netinet_igmp_send, ifp, ifp->if_label, m, 323 mlabel); 324 MAC_IFNET_UNLOCK(ifp, locked); 325 } 326 327 void 328 mac_netinet_tcp_reply(struct mbuf *m) 329 { 330 struct label *label; 331 332 if (mac_policy_count == 0) 333 return; 334 335 label = mac_mbuf_to_label(m); 336 337 MAC_POLICY_PERFORM_NOSLEEP(netinet_tcp_reply, m, label); 338 } 339 340 void 341 mac_ipq_update(struct mbuf *m, struct ipq *q) 342 { 343 struct label *label; 344 345 if (mac_policy_count == 0) 346 return; 347 348 label = mac_mbuf_to_label(m); 349 350 MAC_POLICY_PERFORM_NOSLEEP(ipq_update, m, label, q, q->ipq_label); 351 } 352 353 MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *", 354 "struct mbuf *"); 355 356 int 357 mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m) 358 { 359 struct label *label; 360 int error; 361 362 M_ASSERTPKTHDR(m); 363 364 if (mac_policy_count == 0) 365 return (0); 366 367 label = mac_mbuf_to_label(m); 368 369 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_deliver, inp, inp->inp_label, m, 370 label); 371 MAC_CHECK_PROBE2(inpcb_check_deliver, error, inp, m); 372 373 return (error); 374 } 375 376 MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *", 377 "struct inpcb *"); 378 379 int 380 mac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp) 381 { 382 int error; 383 384 INP_LOCK_ASSERT(inp); 385 386 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_visible, cred, inp, 387 inp->inp_label); 388 MAC_CHECK_PROBE2(inpcb_check_visible, error, cred, inp); 389 390 return (error); 391 } 392 393 void 394 mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp) 395 { 396 397 INP_WLOCK_ASSERT(inp); 398 SOCK_LOCK_ASSERT(so); 399 400 MAC_POLICY_PERFORM_NOSLEEP(inpcb_sosetlabel, so, so->so_label, inp, 401 inp->inp_label); 402 } 403 404 void 405 mac_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend) 406 { 407 struct label *mrecvlabel, *msendlabel; 408 409 M_ASSERTPKTHDR(mrecv); 410 M_ASSERTPKTHDR(msend); 411 412 if (mac_policy_count == 0) 413 return; 414 415 mrecvlabel = mac_mbuf_to_label(mrecv); 416 msendlabel = mac_mbuf_to_label(msend); 417 418 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_reply, mrecv, mrecvlabel, 419 msend, msendlabel); 420 } 421 422 void 423 mac_netinet_firewall_send(struct mbuf *m) 424 { 425 struct label *label; 426 427 M_ASSERTPKTHDR(m); 428 429 if (mac_policy_count == 0) 430 return; 431 432 label = mac_mbuf_to_label(m); 433 434 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_send, m, label); 435 } 436 437 /* 438 * These functions really should be referencing the syncache structure 439 * instead of the label. However, due to some of the complexities associated 440 * with exposing this syncache structure we operate directly on its label 441 * pointer. This should be OK since we aren't making any access control 442 * decisions within this code directly, we are merely allocating and copying 443 * label storage so we can properly initialize mbuf labels for any packets 444 * the syncache code might create. 445 */ 446 void 447 mac_syncache_destroy(struct label **label) 448 { 449 450 if (*label != NULL) { 451 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, *label); 452 mac_labelzone_free(*label); 453 *label = NULL; 454 } 455 } 456 457 int 458 mac_syncache_init(struct label **label) 459 { 460 int error; 461 462 if (mac_labeled & MPC_OBJECT_SYNCACHE) { 463 *label = mac_labelzone_alloc(M_NOWAIT); 464 if (*label == NULL) 465 return (ENOMEM); 466 /* 467 * Since we are holding the inpcb locks the policy can not 468 * allocate policy specific label storage using M_WAITOK. So 469 * we need to do a MAC_CHECK instead of the typical 470 * MAC_PERFORM so we can propagate allocation failures back 471 * to the syncache code. 472 */ 473 MAC_POLICY_CHECK_NOSLEEP(syncache_init_label, *label, 474 M_NOWAIT); 475 if (error) { 476 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, 477 *label); 478 mac_labelzone_free(*label); 479 } 480 return (error); 481 } else 482 *label = NULL; 483 return (0); 484 } 485 486 void 487 mac_syncache_create(struct label *label, struct inpcb *inp) 488 { 489 490 INP_LOCK_ASSERT(inp); 491 492 MAC_POLICY_PERFORM_NOSLEEP(syncache_create, label, inp); 493 } 494 495 void 496 mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m) 497 { 498 struct label *mlabel; 499 500 M_ASSERTPKTHDR(m); 501 502 if (mac_policy_count == 0) 503 return; 504 505 mlabel = mac_mbuf_to_label(m); 506 507 MAC_POLICY_PERFORM_NOSLEEP(syncache_create_mbuf, sc_label, m, 508 mlabel); 509 } 510