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 #include "opt_mac.h" 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/mutex.h> 53 #include <sys/sbuf.h> 54 #include <sys/sdt.h> 55 #include <sys/systm.h> 56 #include <sys/mount.h> 57 #include <sys/file.h> 58 #include <sys/namei.h> 59 #include <sys/protosw.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/sysctl.h> 63 64 #include <net/if.h> 65 #include <net/if_var.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_pcb.h> 69 #include <netinet/ip_var.h> 70 71 #include <security/mac/mac_framework.h> 72 #include <security/mac/mac_internal.h> 73 #include <security/mac/mac_policy.h> 74 75 static struct label * 76 mac_inpcb_label_alloc(int flag) 77 { 78 struct label *label; 79 int error; 80 81 label = mac_labelzone_alloc(flag); 82 if (label == NULL) 83 return (NULL); 84 if (flag & M_WAITOK) 85 MAC_POLICY_CHECK(inpcb_init_label, label, flag); 86 else 87 MAC_POLICY_CHECK_NOSLEEP(inpcb_init_label, label, flag); 88 if (error) { 89 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label); 90 mac_labelzone_free(label); 91 return (NULL); 92 } 93 return (label); 94 } 95 96 int 97 mac_inpcb_init(struct inpcb *inp, int flag) 98 { 99 100 if (mac_labeled & MPC_OBJECT_INPCB) { 101 inp->inp_label = mac_inpcb_label_alloc(flag); 102 if (inp->inp_label == NULL) 103 return (ENOMEM); 104 } else 105 inp->inp_label = NULL; 106 return (0); 107 } 108 109 /* Check with rules in module if the IPv4 address is allowed. */ 110 int 111 mac_inet_check_add_addr(struct ucred *cred, const struct in_addr *ia, 112 struct ifnet *ifp) 113 { 114 int error; 115 116 MAC_POLICY_CHECK(ip4_check_jail, cred, ia, ifp); 117 return (error); 118 } 119 120 static struct label * 121 mac_ipq_label_alloc(int flag) 122 { 123 struct label *label; 124 int error; 125 126 label = mac_labelzone_alloc(flag); 127 if (label == NULL) 128 return (NULL); 129 130 if (flag & M_WAITOK) 131 MAC_POLICY_CHECK(ipq_init_label, label, flag); 132 else 133 MAC_POLICY_CHECK_NOSLEEP(ipq_init_label, label, flag); 134 if (error) { 135 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label); 136 mac_labelzone_free(label); 137 return (NULL); 138 } 139 return (label); 140 } 141 142 int 143 mac_ipq_init(struct ipq *q, int flag) 144 { 145 146 if (mac_labeled & MPC_OBJECT_IPQ) { 147 q->ipq_label = mac_ipq_label_alloc(flag); 148 if (q->ipq_label == NULL) 149 return (ENOMEM); 150 } else 151 q->ipq_label = NULL; 152 return (0); 153 } 154 155 static void 156 mac_inpcb_label_free(struct label *label) 157 { 158 159 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label); 160 mac_labelzone_free(label); 161 } 162 163 void 164 mac_inpcb_destroy(struct inpcb *inp) 165 { 166 167 if (inp->inp_label != NULL) { 168 mac_inpcb_label_free(inp->inp_label); 169 inp->inp_label = NULL; 170 } 171 } 172 173 static void 174 mac_ipq_label_free(struct label *label) 175 { 176 177 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label); 178 mac_labelzone_free(label); 179 } 180 181 void 182 mac_ipq_destroy(struct ipq *q) 183 { 184 185 if (q->ipq_label != NULL) { 186 mac_ipq_label_free(q->ipq_label); 187 q->ipq_label = NULL; 188 } 189 } 190 191 void 192 mac_inpcb_create(struct socket *so, struct inpcb *inp) 193 { 194 195 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create, so, so->so_label, inp, 196 inp->inp_label); 197 } 198 199 void 200 mac_ipq_reassemble(struct ipq *q, struct mbuf *m) 201 { 202 struct label *label; 203 204 if (mac_policy_count == 0) 205 return; 206 207 label = mac_mbuf_to_label(m); 208 209 MAC_POLICY_PERFORM_NOSLEEP(ipq_reassemble, q, q->ipq_label, m, 210 label); 211 } 212 213 void 214 mac_netinet_fragment(struct mbuf *m, struct mbuf *frag) 215 { 216 struct label *mlabel, *fraglabel; 217 218 if (mac_policy_count == 0) 219 return; 220 221 mlabel = mac_mbuf_to_label(m); 222 fraglabel = mac_mbuf_to_label(frag); 223 224 MAC_POLICY_PERFORM_NOSLEEP(netinet_fragment, m, mlabel, frag, 225 fraglabel); 226 } 227 228 void 229 mac_ipq_create(struct mbuf *m, struct ipq *q) 230 { 231 struct label *label; 232 233 if (mac_policy_count == 0) 234 return; 235 236 label = mac_mbuf_to_label(m); 237 238 MAC_POLICY_PERFORM_NOSLEEP(ipq_create, m, label, q, q->ipq_label); 239 } 240 241 void 242 mac_inpcb_create_mbuf(struct inpcb *inp, struct mbuf *m) 243 { 244 struct label *mlabel; 245 246 INP_LOCK_ASSERT(inp); 247 248 if (mac_policy_count == 0) 249 return; 250 251 mlabel = mac_mbuf_to_label(m); 252 253 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create_mbuf, inp, inp->inp_label, m, 254 mlabel); 255 } 256 257 int 258 mac_ipq_match(struct mbuf *m, struct ipq *q) 259 { 260 struct label *label; 261 int result; 262 263 if (mac_policy_count == 0) 264 return (1); 265 266 label = mac_mbuf_to_label(m); 267 268 result = 1; 269 MAC_POLICY_BOOLEAN_NOSLEEP(ipq_match, &&, m, label, q, q->ipq_label); 270 271 return (result); 272 } 273 274 void 275 mac_netinet_arp_send(struct ifnet *ifp, struct mbuf *m) 276 { 277 struct label *mlabel; 278 int locked; 279 280 if (mac_policy_count == 0) 281 return; 282 283 mlabel = mac_mbuf_to_label(m); 284 285 MAC_IFNET_LOCK(ifp, locked); 286 MAC_POLICY_PERFORM_NOSLEEP(netinet_arp_send, ifp, if_getmaclabel(ifp), 287 m, mlabel); 288 MAC_IFNET_UNLOCK(ifp, locked); 289 } 290 291 void 292 mac_netinet_icmp_reply(struct mbuf *mrecv, struct mbuf *msend) 293 { 294 struct label *mrecvlabel, *msendlabel; 295 296 if (mac_policy_count == 0) 297 return; 298 299 mrecvlabel = mac_mbuf_to_label(mrecv); 300 msendlabel = mac_mbuf_to_label(msend); 301 302 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_reply, mrecv, mrecvlabel, 303 msend, msendlabel); 304 } 305 306 void 307 mac_netinet_icmp_replyinplace(struct mbuf *m) 308 { 309 struct label *label; 310 311 if (mac_policy_count == 0) 312 return; 313 314 label = mac_mbuf_to_label(m); 315 316 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_replyinplace, m, label); 317 } 318 319 void 320 mac_netinet_igmp_send(struct ifnet *ifp, struct mbuf *m) 321 { 322 struct label *mlabel; 323 int locked; 324 325 if (mac_policy_count == 0) 326 return; 327 328 mlabel = mac_mbuf_to_label(m); 329 330 MAC_IFNET_LOCK(ifp, locked); 331 MAC_POLICY_PERFORM_NOSLEEP(netinet_igmp_send, ifp, if_getmaclabel(ifp), 332 m, mlabel); 333 MAC_IFNET_UNLOCK(ifp, locked); 334 } 335 336 void 337 mac_netinet_tcp_reply(struct mbuf *m) 338 { 339 struct label *label; 340 341 if (mac_policy_count == 0) 342 return; 343 344 label = mac_mbuf_to_label(m); 345 346 MAC_POLICY_PERFORM_NOSLEEP(netinet_tcp_reply, m, label); 347 } 348 349 void 350 mac_ipq_update(struct mbuf *m, struct ipq *q) 351 { 352 struct label *label; 353 354 if (mac_policy_count == 0) 355 return; 356 357 label = mac_mbuf_to_label(m); 358 359 MAC_POLICY_PERFORM_NOSLEEP(ipq_update, m, label, q, q->ipq_label); 360 } 361 362 MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *", 363 "struct mbuf *"); 364 365 int 366 mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m) 367 { 368 struct label *label; 369 int error; 370 371 M_ASSERTPKTHDR(m); 372 373 if (mac_policy_count == 0) 374 return (0); 375 376 label = mac_mbuf_to_label(m); 377 378 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_deliver, inp, inp->inp_label, m, 379 label); 380 MAC_CHECK_PROBE2(inpcb_check_deliver, error, inp, m); 381 382 return (error); 383 } 384 385 MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *", 386 "struct inpcb *"); 387 388 int 389 mac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp) 390 { 391 int error; 392 393 INP_LOCK_ASSERT(inp); 394 395 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_visible, cred, inp, 396 inp->inp_label); 397 MAC_CHECK_PROBE2(inpcb_check_visible, error, cred, inp); 398 399 return (error); 400 } 401 402 void 403 mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp) 404 { 405 406 INP_WLOCK_ASSERT(inp); 407 SOCK_LOCK_ASSERT(so); 408 409 MAC_POLICY_PERFORM_NOSLEEP(inpcb_sosetlabel, so, so->so_label, inp, 410 inp->inp_label); 411 } 412 413 void 414 mac_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend) 415 { 416 struct label *mrecvlabel, *msendlabel; 417 418 M_ASSERTPKTHDR(mrecv); 419 M_ASSERTPKTHDR(msend); 420 421 if (mac_policy_count == 0) 422 return; 423 424 mrecvlabel = mac_mbuf_to_label(mrecv); 425 msendlabel = mac_mbuf_to_label(msend); 426 427 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_reply, mrecv, mrecvlabel, 428 msend, msendlabel); 429 } 430 431 void 432 mac_netinet_firewall_send(struct mbuf *m) 433 { 434 struct label *label; 435 436 M_ASSERTPKTHDR(m); 437 438 if (mac_policy_count == 0) 439 return; 440 441 label = mac_mbuf_to_label(m); 442 443 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_send, m, label); 444 } 445 446 /* 447 * These functions really should be referencing the syncache structure 448 * instead of the label. However, due to some of the complexities associated 449 * with exposing this syncache structure we operate directly on its label 450 * pointer. This should be OK since we aren't making any access control 451 * decisions within this code directly, we are merely allocating and copying 452 * label storage so we can properly initialize mbuf labels for any packets 453 * the syncache code might create. 454 */ 455 void 456 mac_syncache_destroy(struct label **label) 457 { 458 459 if (*label != NULL) { 460 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, *label); 461 mac_labelzone_free(*label); 462 *label = NULL; 463 } 464 } 465 466 int 467 mac_syncache_init(struct label **label) 468 { 469 int error; 470 471 if (mac_labeled & MPC_OBJECT_SYNCACHE) { 472 *label = mac_labelzone_alloc(M_NOWAIT); 473 if (*label == NULL) 474 return (ENOMEM); 475 /* 476 * Since we are holding the inpcb locks the policy can not 477 * allocate policy specific label storage using M_WAITOK. So 478 * we need to do a MAC_CHECK instead of the typical 479 * MAC_PERFORM so we can propagate allocation failures back 480 * to the syncache code. 481 */ 482 MAC_POLICY_CHECK_NOSLEEP(syncache_init_label, *label, 483 M_NOWAIT); 484 if (error) { 485 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, 486 *label); 487 mac_labelzone_free(*label); 488 } 489 return (error); 490 } else 491 *label = NULL; 492 return (0); 493 } 494 495 void 496 mac_syncache_create(struct label *label, struct inpcb *inp) 497 { 498 499 INP_LOCK_ASSERT(inp); 500 501 MAC_POLICY_PERFORM_NOSLEEP(syncache_create, label, inp); 502 } 503 504 void 505 mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m) 506 { 507 struct label *mlabel; 508 509 M_ASSERTPKTHDR(m); 510 511 if (mac_policy_count == 0) 512 return; 513 514 mlabel = mac_mbuf_to_label(m); 515 516 MAC_POLICY_PERFORM_NOSLEEP(syncache_create_mbuf, sc_label, m, 517 mlabel); 518 } 519