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 /* Check with rules in module if the IPv4 address is allowed. */ 112 int 113 mac_inet_check_add_addr(struct ucred *cred, const struct in_addr *ia, 114 struct ifnet *ifp) 115 { 116 int error; 117 118 MAC_POLICY_CHECK(ip4_check_jail, cred, ia, ifp); 119 return (error); 120 } 121 122 static struct label * 123 mac_ipq_label_alloc(int flag) 124 { 125 struct label *label; 126 int error; 127 128 label = mac_labelzone_alloc(flag); 129 if (label == NULL) 130 return (NULL); 131 132 if (flag & M_WAITOK) 133 MAC_POLICY_CHECK(ipq_init_label, label, flag); 134 else 135 MAC_POLICY_CHECK_NOSLEEP(ipq_init_label, label, flag); 136 if (error) { 137 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label); 138 mac_labelzone_free(label); 139 return (NULL); 140 } 141 return (label); 142 } 143 144 int 145 mac_ipq_init(struct ipq *q, int flag) 146 { 147 148 if (mac_labeled & MPC_OBJECT_IPQ) { 149 q->ipq_label = mac_ipq_label_alloc(flag); 150 if (q->ipq_label == NULL) 151 return (ENOMEM); 152 } else 153 q->ipq_label = NULL; 154 return (0); 155 } 156 157 static void 158 mac_inpcb_label_free(struct label *label) 159 { 160 161 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label); 162 mac_labelzone_free(label); 163 } 164 165 void 166 mac_inpcb_destroy(struct inpcb *inp) 167 { 168 169 if (inp->inp_label != NULL) { 170 mac_inpcb_label_free(inp->inp_label); 171 inp->inp_label = NULL; 172 } 173 } 174 175 static void 176 mac_ipq_label_free(struct label *label) 177 { 178 179 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label); 180 mac_labelzone_free(label); 181 } 182 183 void 184 mac_ipq_destroy(struct ipq *q) 185 { 186 187 if (q->ipq_label != NULL) { 188 mac_ipq_label_free(q->ipq_label); 189 q->ipq_label = NULL; 190 } 191 } 192 193 void 194 mac_inpcb_create(struct socket *so, struct inpcb *inp) 195 { 196 197 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create, so, so->so_label, inp, 198 inp->inp_label); 199 } 200 201 void 202 mac_ipq_reassemble(struct ipq *q, struct mbuf *m) 203 { 204 struct label *label; 205 206 if (mac_policy_count == 0) 207 return; 208 209 label = mac_mbuf_to_label(m); 210 211 MAC_POLICY_PERFORM_NOSLEEP(ipq_reassemble, q, q->ipq_label, m, 212 label); 213 } 214 215 void 216 mac_netinet_fragment(struct mbuf *m, struct mbuf *frag) 217 { 218 struct label *mlabel, *fraglabel; 219 220 if (mac_policy_count == 0) 221 return; 222 223 mlabel = mac_mbuf_to_label(m); 224 fraglabel = mac_mbuf_to_label(frag); 225 226 MAC_POLICY_PERFORM_NOSLEEP(netinet_fragment, m, mlabel, frag, 227 fraglabel); 228 } 229 230 void 231 mac_ipq_create(struct mbuf *m, struct ipq *q) 232 { 233 struct label *label; 234 235 if (mac_policy_count == 0) 236 return; 237 238 label = mac_mbuf_to_label(m); 239 240 MAC_POLICY_PERFORM_NOSLEEP(ipq_create, m, label, q, q->ipq_label); 241 } 242 243 void 244 mac_inpcb_create_mbuf(struct inpcb *inp, struct mbuf *m) 245 { 246 struct label *mlabel; 247 248 INP_LOCK_ASSERT(inp); 249 250 if (mac_policy_count == 0) 251 return; 252 253 mlabel = mac_mbuf_to_label(m); 254 255 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create_mbuf, inp, inp->inp_label, m, 256 mlabel); 257 } 258 259 int 260 mac_ipq_match(struct mbuf *m, struct ipq *q) 261 { 262 struct label *label; 263 int result; 264 265 if (mac_policy_count == 0) 266 return (1); 267 268 label = mac_mbuf_to_label(m); 269 270 result = 1; 271 MAC_POLICY_BOOLEAN_NOSLEEP(ipq_match, &&, m, label, q, q->ipq_label); 272 273 return (result); 274 } 275 276 void 277 mac_netinet_arp_send(struct ifnet *ifp, struct mbuf *m) 278 { 279 struct label *mlabel; 280 int locked; 281 282 if (mac_policy_count == 0) 283 return; 284 285 mlabel = mac_mbuf_to_label(m); 286 287 MAC_IFNET_LOCK(ifp, locked); 288 MAC_POLICY_PERFORM_NOSLEEP(netinet_arp_send, ifp, if_getmaclabel(ifp), 289 m, mlabel); 290 MAC_IFNET_UNLOCK(ifp, locked); 291 } 292 293 void 294 mac_netinet_icmp_reply(struct mbuf *mrecv, struct mbuf *msend) 295 { 296 struct label *mrecvlabel, *msendlabel; 297 298 if (mac_policy_count == 0) 299 return; 300 301 mrecvlabel = mac_mbuf_to_label(mrecv); 302 msendlabel = mac_mbuf_to_label(msend); 303 304 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_reply, mrecv, mrecvlabel, 305 msend, msendlabel); 306 } 307 308 void 309 mac_netinet_icmp_replyinplace(struct mbuf *m) 310 { 311 struct label *label; 312 313 if (mac_policy_count == 0) 314 return; 315 316 label = mac_mbuf_to_label(m); 317 318 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_replyinplace, m, label); 319 } 320 321 void 322 mac_netinet_igmp_send(struct ifnet *ifp, struct mbuf *m) 323 { 324 struct label *mlabel; 325 int locked; 326 327 if (mac_policy_count == 0) 328 return; 329 330 mlabel = mac_mbuf_to_label(m); 331 332 MAC_IFNET_LOCK(ifp, locked); 333 MAC_POLICY_PERFORM_NOSLEEP(netinet_igmp_send, ifp, if_getmaclabel(ifp), 334 m, mlabel); 335 MAC_IFNET_UNLOCK(ifp, locked); 336 } 337 338 void 339 mac_netinet_tcp_reply(struct mbuf *m) 340 { 341 struct label *label; 342 343 if (mac_policy_count == 0) 344 return; 345 346 label = mac_mbuf_to_label(m); 347 348 MAC_POLICY_PERFORM_NOSLEEP(netinet_tcp_reply, m, label); 349 } 350 351 void 352 mac_ipq_update(struct mbuf *m, struct ipq *q) 353 { 354 struct label *label; 355 356 if (mac_policy_count == 0) 357 return; 358 359 label = mac_mbuf_to_label(m); 360 361 MAC_POLICY_PERFORM_NOSLEEP(ipq_update, m, label, q, q->ipq_label); 362 } 363 364 MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *", 365 "struct mbuf *"); 366 367 int 368 mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m) 369 { 370 struct label *label; 371 int error; 372 373 M_ASSERTPKTHDR(m); 374 375 if (mac_policy_count == 0) 376 return (0); 377 378 label = mac_mbuf_to_label(m); 379 380 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_deliver, inp, inp->inp_label, m, 381 label); 382 MAC_CHECK_PROBE2(inpcb_check_deliver, error, inp, m); 383 384 return (error); 385 } 386 387 MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *", 388 "struct inpcb *"); 389 390 int 391 mac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp) 392 { 393 int error; 394 395 INP_LOCK_ASSERT(inp); 396 397 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_visible, cred, inp, 398 inp->inp_label); 399 MAC_CHECK_PROBE2(inpcb_check_visible, error, cred, inp); 400 401 return (error); 402 } 403 404 void 405 mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp) 406 { 407 408 INP_WLOCK_ASSERT(inp); 409 SOCK_LOCK_ASSERT(so); 410 411 MAC_POLICY_PERFORM_NOSLEEP(inpcb_sosetlabel, so, so->so_label, inp, 412 inp->inp_label); 413 } 414 415 void 416 mac_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend) 417 { 418 struct label *mrecvlabel, *msendlabel; 419 420 M_ASSERTPKTHDR(mrecv); 421 M_ASSERTPKTHDR(msend); 422 423 if (mac_policy_count == 0) 424 return; 425 426 mrecvlabel = mac_mbuf_to_label(mrecv); 427 msendlabel = mac_mbuf_to_label(msend); 428 429 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_reply, mrecv, mrecvlabel, 430 msend, msendlabel); 431 } 432 433 void 434 mac_netinet_firewall_send(struct mbuf *m) 435 { 436 struct label *label; 437 438 M_ASSERTPKTHDR(m); 439 440 if (mac_policy_count == 0) 441 return; 442 443 label = mac_mbuf_to_label(m); 444 445 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_send, m, label); 446 } 447 448 /* 449 * These functions really should be referencing the syncache structure 450 * instead of the label. However, due to some of the complexities associated 451 * with exposing this syncache structure we operate directly on its label 452 * pointer. This should be OK since we aren't making any access control 453 * decisions within this code directly, we are merely allocating and copying 454 * label storage so we can properly initialize mbuf labels for any packets 455 * the syncache code might create. 456 */ 457 void 458 mac_syncache_destroy(struct label **label) 459 { 460 461 if (*label != NULL) { 462 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, *label); 463 mac_labelzone_free(*label); 464 *label = NULL; 465 } 466 } 467 468 int 469 mac_syncache_init(struct label **label) 470 { 471 int error; 472 473 if (mac_labeled & MPC_OBJECT_SYNCACHE) { 474 *label = mac_labelzone_alloc(M_NOWAIT); 475 if (*label == NULL) 476 return (ENOMEM); 477 /* 478 * Since we are holding the inpcb locks the policy can not 479 * allocate policy specific label storage using M_WAITOK. So 480 * we need to do a MAC_CHECK instead of the typical 481 * MAC_PERFORM so we can propagate allocation failures back 482 * to the syncache code. 483 */ 484 MAC_POLICY_CHECK_NOSLEEP(syncache_init_label, *label, 485 M_NOWAIT); 486 if (error) { 487 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, 488 *label); 489 mac_labelzone_free(*label); 490 } 491 return (error); 492 } else 493 *label = NULL; 494 return (0); 495 } 496 497 void 498 mac_syncache_create(struct label *label, struct inpcb *inp) 499 { 500 501 INP_LOCK_ASSERT(inp); 502 503 MAC_POLICY_PERFORM_NOSLEEP(syncache_create, label, inp); 504 } 505 506 void 507 mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m) 508 { 509 struct label *mlabel; 510 511 M_ASSERTPKTHDR(m); 512 513 if (mac_policy_count == 0) 514 return; 515 516 mlabel = mac_mbuf_to_label(m); 517 518 MAC_POLICY_PERFORM_NOSLEEP(syncache_create_mbuf, sc_label, m, 519 mlabel); 520 } 521