1 /*- 2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson 3 * Copyright (c) 2001 Ilmar S. Habibulin 4 * Copyright (c) 2001, 2002 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * This software was developed by Robert Watson and Ilmar Habibulin for the 8 * TrustedBSD Project. 9 * 10 * This software was developed for the FreeBSD Project in part by NAI Labs, 11 * the Security Research Division of Network Associates, Inc. under 12 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 13 * CHATS research program. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. The names of the authors may not be used to endorse or promote 24 * products derived from this software without specific prior written 25 * permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * $FreeBSD$ 40 */ 41 /* 42 * Developed by the TrustedBSD Project. 43 * 44 * Framework for extensible kernel access control. Kernel and userland 45 * interface to the framework, policy registration and composition. 46 */ 47 48 #include "opt_mac.h" 49 50 #include <sys/param.h> 51 #include <sys/extattr.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/mutex.h> 56 #include <sys/mac.h> 57 #include <sys/module.h> 58 #include <sys/proc.h> 59 #include <sys/systm.h> 60 #include <sys/sysproto.h> 61 #include <sys/sysent.h> 62 #include <sys/vnode.h> 63 #include <sys/mount.h> 64 #include <sys/file.h> 65 #include <sys/namei.h> 66 #include <sys/socket.h> 67 #include <sys/pipe.h> 68 #include <sys/socketvar.h> 69 #include <sys/sysctl.h> 70 71 #include <vm/vm.h> 72 #include <vm/pmap.h> 73 #include <vm/vm_map.h> 74 #include <vm/vm_object.h> 75 76 #include <sys/mac_policy.h> 77 78 #include <fs/devfs/devfs.h> 79 80 #include <net/bpfdesc.h> 81 #include <net/if.h> 82 #include <net/if_var.h> 83 84 #include <netinet/in.h> 85 #include <netinet/ip_var.h> 86 87 #ifdef MAC 88 89 /* 90 * Declare that the kernel provides MAC support, version 1. This permits 91 * modules to refuse to be loaded if the necessary support isn't present, 92 * even if it's pre-boot. 93 */ 94 MODULE_VERSION(kernel_mac_support, 1); 95 96 SYSCTL_DECL(_security); 97 98 SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0, 99 "TrustedBSD MAC policy controls"); 100 #ifndef MAC_MAX_POLICIES 101 #define MAC_MAX_POLICIES 8 102 #endif 103 #if MAC_MAX_POLICIES > 32 104 #error "MAC_MAX_POLICIES too large" 105 #endif 106 static unsigned int mac_max_policies = MAC_MAX_POLICIES; 107 static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1; 108 SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD, 109 &mac_max_policies, 0, ""); 110 111 static int mac_late = 0; 112 113 static int mac_enforce_fs = 1; 114 SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW, 115 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects"); 116 TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs); 117 118 static int mac_enforce_network = 1; 119 SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW, 120 &mac_enforce_network, 0, "Enforce MAC policy on network packets"); 121 TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network); 122 123 static int mac_enforce_pipe = 1; 124 SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW, 125 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations"); 126 TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe); 127 128 static int mac_enforce_process = 1; 129 SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW, 130 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations"); 131 TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process); 132 133 static int mac_enforce_socket = 1; 134 SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW, 135 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations"); 136 TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket); 137 138 static int mac_enforce_vm = 1; 139 SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW, 140 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations"); 141 TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm); 142 143 static int mac_label_size = sizeof(struct mac); 144 SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD, 145 &mac_label_size, 0, "Pre-compiled MAC label size"); 146 147 static int mac_cache_fslabel_in_vnode = 1; 148 SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW, 149 &mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode"); 150 TUNABLE_INT("security.mac.cache_fslabel_in_vnode", 151 &mac_cache_fslabel_in_vnode); 152 153 static int mac_vnode_label_cache_hits = 0; 154 SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD, 155 &mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels"); 156 static int mac_vnode_label_cache_misses = 0; 157 SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD, 158 &mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels"); 159 160 static int mac_mmap_revocation = 1; 161 SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW, 162 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject " 163 "relabel"); 164 static int mac_mmap_revocation_via_cow = 0; 165 SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW, 166 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via " 167 "copy-on-write semantics, or by removing all write access"); 168 169 #ifdef MAC_DEBUG 170 SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0, 171 "TrustedBSD MAC debug info"); 172 173 static int mac_debug_label_fallback = 0; 174 SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW, 175 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label" 176 "when label is corrupted."); 177 TUNABLE_INT("security.mac.debug_label_fallback", 178 &mac_debug_label_fallback); 179 180 static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs, 181 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents, 182 nmacipqs, nmacpipes; 183 SYSCTL_UINT(_security_mac_debug, OID_AUTO, mbufs, CTLFLAG_RD, 184 &nmacmbufs, 0, "number of mbufs in use"); 185 SYSCTL_UINT(_security_mac_debug, OID_AUTO, creds, CTLFLAG_RD, 186 &nmaccreds, 0, "number of ucreds in use"); 187 SYSCTL_UINT(_security_mac_debug, OID_AUTO, ifnets, CTLFLAG_RD, 188 &nmacifnets, 0, "number of ifnets in use"); 189 SYSCTL_UINT(_security_mac_debug, OID_AUTO, ipqs, CTLFLAG_RD, 190 &nmacipqs, 0, "number of ipqs in use"); 191 SYSCTL_UINT(_security_mac_debug, OID_AUTO, bpfdescs, CTLFLAG_RD, 192 &nmacbpfdescs, 0, "number of bpfdescs in use"); 193 SYSCTL_UINT(_security_mac_debug, OID_AUTO, sockets, CTLFLAG_RD, 194 &nmacsockets, 0, "number of sockets in use"); 195 SYSCTL_UINT(_security_mac_debug, OID_AUTO, pipes, CTLFLAG_RD, 196 &nmacpipes, 0, "number of pipes in use"); 197 SYSCTL_UINT(_security_mac_debug, OID_AUTO, mounts, CTLFLAG_RD, 198 &nmacmounts, 0, "number of mounts in use"); 199 SYSCTL_UINT(_security_mac_debug, OID_AUTO, temp, CTLFLAG_RD, 200 &nmactemp, 0, "number of temporary labels in use"); 201 SYSCTL_UINT(_security_mac_debug, OID_AUTO, vnodes, CTLFLAG_RD, 202 &nmacvnodes, 0, "number of vnodes in use"); 203 SYSCTL_UINT(_security_mac_debug, OID_AUTO, devfsdirents, CTLFLAG_RD, 204 &nmacdevfsdirents, 0, "number of devfs dirents inuse"); 205 #endif 206 207 static int error_select(int error1, int error2); 208 static int mac_externalize(struct label *label, struct mac *mac); 209 static int mac_policy_register(struct mac_policy_conf *mpc); 210 static int mac_policy_unregister(struct mac_policy_conf *mpc); 211 212 static int mac_stdcreatevnode_ea(struct vnode *vp); 213 static void mac_cred_mmapped_drop_perms(struct thread *td, 214 struct ucred *cred); 215 static void mac_cred_mmapped_drop_perms_recurse(struct thread *td, 216 struct ucred *cred, struct vm_map *map); 217 218 MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector"); 219 MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes"); 220 221 /* 222 * mac_policy_list_lock protects the consistency of 'mac_policy_list', 223 * the linked list of attached policy modules. Read-only consumers of 224 * the list must acquire a shared lock for the duration of their use; 225 * writers must acquire an exclusive lock. Note that for compound 226 * operations, locks should be held for the entire compound operation, 227 * and that this is not yet done for relabel requests. 228 */ 229 static struct mtx mac_policy_list_lock; 230 static LIST_HEAD(, mac_policy_conf) mac_policy_list; 231 static int mac_policy_list_busy; 232 #define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \ 233 "mac_policy_list_lock", NULL, MTX_DEF); 234 #define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock); 235 #define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock); 236 237 #define MAC_POLICY_LIST_BUSY() do { \ 238 MAC_POLICY_LIST_LOCK(); \ 239 mac_policy_list_busy++; \ 240 MAC_POLICY_LIST_UNLOCK(); \ 241 } while (0) 242 243 #define MAC_POLICY_LIST_UNBUSY() do { \ 244 MAC_POLICY_LIST_LOCK(); \ 245 mac_policy_list_busy--; \ 246 if (mac_policy_list_busy < 0) \ 247 panic("Extra mac_policy_list_busy--"); \ 248 MAC_POLICY_LIST_UNLOCK(); \ 249 } while (0) 250 251 /* 252 * MAC_CHECK performs the designated check by walking the policy 253 * module list and checking with each as to how it feels about the 254 * request. Note that it returns its value via 'error' in the scope 255 * of the caller. 256 */ 257 #define MAC_CHECK(check, args...) do { \ 258 struct mac_policy_conf *mpc; \ 259 \ 260 error = 0; \ 261 MAC_POLICY_LIST_BUSY(); \ 262 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 263 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 264 error = error_select( \ 265 mpc->mpc_ops->mpo_ ## check (args), \ 266 error); \ 267 } \ 268 MAC_POLICY_LIST_UNBUSY(); \ 269 } while (0) 270 271 /* 272 * MAC_BOOLEAN performs the designated boolean composition by walking 273 * the module list, invoking each instance of the operation, and 274 * combining the results using the passed C operator. Note that it 275 * returns its value via 'result' in the scope of the caller, which 276 * should be initialized by the caller in a meaningful way to get 277 * a meaningful result. 278 */ 279 #define MAC_BOOLEAN(operation, composition, args...) do { \ 280 struct mac_policy_conf *mpc; \ 281 \ 282 MAC_POLICY_LIST_BUSY(); \ 283 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 284 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 285 result = result composition \ 286 mpc->mpc_ops->mpo_ ## operation (args); \ 287 } \ 288 MAC_POLICY_LIST_UNBUSY(); \ 289 } while (0) 290 291 /* 292 * MAC_PERFORM performs the designated operation by walking the policy 293 * module list and invoking that operation for each policy. 294 */ 295 #define MAC_PERFORM(operation, args...) do { \ 296 struct mac_policy_conf *mpc; \ 297 \ 298 MAC_POLICY_LIST_BUSY(); \ 299 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 300 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 301 mpc->mpc_ops->mpo_ ## operation (args); \ 302 } \ 303 MAC_POLICY_LIST_UNBUSY(); \ 304 } while (0) 305 306 /* 307 * Initialize the MAC subsystem, including appropriate SMP locks. 308 */ 309 static void 310 mac_init(void) 311 { 312 313 LIST_INIT(&mac_policy_list); 314 MAC_POLICY_LIST_LOCKINIT(); 315 } 316 317 /* 318 * For the purposes of modules that want to know if they were loaded 319 * "early", set the mac_late flag once we've processed modules either 320 * linked into the kernel, or loaded before the kernel startup. 321 */ 322 static void 323 mac_late_init(void) 324 { 325 326 mac_late = 1; 327 } 328 329 /* 330 * Allow MAC policy modules to register during boot, etc. 331 */ 332 int 333 mac_policy_modevent(module_t mod, int type, void *data) 334 { 335 struct mac_policy_conf *mpc; 336 int error; 337 338 error = 0; 339 mpc = (struct mac_policy_conf *) data; 340 341 switch (type) { 342 case MOD_LOAD: 343 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE && 344 mac_late) { 345 printf("mac_policy_modevent: can't load %s policy " 346 "after booting\n", mpc->mpc_name); 347 error = EBUSY; 348 break; 349 } 350 error = mac_policy_register(mpc); 351 break; 352 case MOD_UNLOAD: 353 /* Don't unregister the module if it was never registered. */ 354 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) 355 != 0) 356 error = mac_policy_unregister(mpc); 357 else 358 error = 0; 359 break; 360 default: 361 break; 362 } 363 364 return (error); 365 } 366 367 static int 368 mac_policy_register(struct mac_policy_conf *mpc) 369 { 370 struct mac_policy_conf *tmpc; 371 struct mac_policy_op_entry *mpe; 372 int slot; 373 374 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops), 375 M_MACOPVEC, M_WAITOK | M_ZERO); 376 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) { 377 switch (mpe->mpe_constant) { 378 case MAC_OP_LAST: 379 /* 380 * Doesn't actually happen, but this allows checking 381 * that all enumerated values are handled. 382 */ 383 break; 384 case MAC_DESTROY: 385 mpc->mpc_ops->mpo_destroy = 386 mpe->mpe_function; 387 break; 388 case MAC_INIT: 389 mpc->mpc_ops->mpo_init = 390 mpe->mpe_function; 391 break; 392 case MAC_SYSCALL: 393 mpc->mpc_ops->mpo_syscall = 394 mpe->mpe_function; 395 break; 396 case MAC_INIT_BPFDESC: 397 mpc->mpc_ops->mpo_init_bpfdesc = 398 mpe->mpe_function; 399 break; 400 case MAC_INIT_CRED: 401 mpc->mpc_ops->mpo_init_cred = 402 mpe->mpe_function; 403 break; 404 case MAC_INIT_DEVFSDIRENT: 405 mpc->mpc_ops->mpo_init_devfsdirent = 406 mpe->mpe_function; 407 break; 408 case MAC_INIT_IFNET: 409 mpc->mpc_ops->mpo_init_ifnet = 410 mpe->mpe_function; 411 break; 412 case MAC_INIT_IPQ: 413 mpc->mpc_ops->mpo_init_ipq = 414 mpe->mpe_function; 415 break; 416 case MAC_INIT_MBUF: 417 mpc->mpc_ops->mpo_init_mbuf = 418 mpe->mpe_function; 419 break; 420 case MAC_INIT_MOUNT: 421 mpc->mpc_ops->mpo_init_mount = 422 mpe->mpe_function; 423 break; 424 case MAC_INIT_PIPE: 425 mpc->mpc_ops->mpo_init_pipe = 426 mpe->mpe_function; 427 break; 428 case MAC_INIT_SOCKET: 429 mpc->mpc_ops->mpo_init_socket = 430 mpe->mpe_function; 431 break; 432 case MAC_INIT_TEMP: 433 mpc->mpc_ops->mpo_init_temp = 434 mpe->mpe_function; 435 break; 436 case MAC_INIT_VNODE: 437 mpc->mpc_ops->mpo_init_vnode = 438 mpe->mpe_function; 439 break; 440 case MAC_DESTROY_BPFDESC: 441 mpc->mpc_ops->mpo_destroy_bpfdesc = 442 mpe->mpe_function; 443 break; 444 case MAC_DESTROY_CRED: 445 mpc->mpc_ops->mpo_destroy_cred = 446 mpe->mpe_function; 447 break; 448 case MAC_DESTROY_DEVFSDIRENT: 449 mpc->mpc_ops->mpo_destroy_devfsdirent = 450 mpe->mpe_function; 451 break; 452 case MAC_DESTROY_IFNET: 453 mpc->mpc_ops->mpo_destroy_ifnet = 454 mpe->mpe_function; 455 break; 456 case MAC_DESTROY_IPQ: 457 mpc->mpc_ops->mpo_destroy_ipq = 458 mpe->mpe_function; 459 break; 460 case MAC_DESTROY_MBUF: 461 mpc->mpc_ops->mpo_destroy_mbuf = 462 mpe->mpe_function; 463 break; 464 case MAC_DESTROY_MOUNT: 465 mpc->mpc_ops->mpo_destroy_mount = 466 mpe->mpe_function; 467 break; 468 case MAC_DESTROY_PIPE: 469 mpc->mpc_ops->mpo_destroy_pipe = 470 mpe->mpe_function; 471 break; 472 case MAC_DESTROY_SOCKET: 473 mpc->mpc_ops->mpo_destroy_socket = 474 mpe->mpe_function; 475 break; 476 case MAC_DESTROY_TEMP: 477 mpc->mpc_ops->mpo_destroy_temp = 478 mpe->mpe_function; 479 break; 480 case MAC_DESTROY_VNODE: 481 mpc->mpc_ops->mpo_destroy_vnode = 482 mpe->mpe_function; 483 break; 484 case MAC_EXTERNALIZE: 485 mpc->mpc_ops->mpo_externalize = 486 mpe->mpe_function; 487 break; 488 case MAC_INTERNALIZE: 489 mpc->mpc_ops->mpo_internalize = 490 mpe->mpe_function; 491 break; 492 case MAC_CREATE_DEVFS_DEVICE: 493 mpc->mpc_ops->mpo_create_devfs_device = 494 mpe->mpe_function; 495 break; 496 case MAC_CREATE_DEVFS_DIRECTORY: 497 mpc->mpc_ops->mpo_create_devfs_directory = 498 mpe->mpe_function; 499 break; 500 case MAC_CREATE_DEVFS_VNODE: 501 mpc->mpc_ops->mpo_create_devfs_vnode = 502 mpe->mpe_function; 503 break; 504 case MAC_STDCREATEVNODE_EA: 505 mpc->mpc_ops->mpo_stdcreatevnode_ea = 506 mpe->mpe_function; 507 break; 508 case MAC_CREATE_VNODE: 509 mpc->mpc_ops->mpo_create_vnode = 510 mpe->mpe_function; 511 break; 512 case MAC_CREATE_MOUNT: 513 mpc->mpc_ops->mpo_create_mount = 514 mpe->mpe_function; 515 break; 516 case MAC_CREATE_ROOT_MOUNT: 517 mpc->mpc_ops->mpo_create_root_mount = 518 mpe->mpe_function; 519 break; 520 case MAC_RELABEL_VNODE: 521 mpc->mpc_ops->mpo_relabel_vnode = 522 mpe->mpe_function; 523 break; 524 case MAC_UPDATE_DEVFSDIRENT: 525 mpc->mpc_ops->mpo_update_devfsdirent = 526 mpe->mpe_function; 527 break; 528 case MAC_UPDATE_PROCFSVNODE: 529 mpc->mpc_ops->mpo_update_procfsvnode = 530 mpe->mpe_function; 531 break; 532 case MAC_UPDATE_VNODE_FROM_EXTATTR: 533 mpc->mpc_ops->mpo_update_vnode_from_extattr = 534 mpe->mpe_function; 535 break; 536 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED: 537 mpc->mpc_ops->mpo_update_vnode_from_externalized = 538 mpe->mpe_function; 539 break; 540 case MAC_UPDATE_VNODE_FROM_MOUNT: 541 mpc->mpc_ops->mpo_update_vnode_from_mount = 542 mpe->mpe_function; 543 break; 544 case MAC_CREATE_MBUF_FROM_SOCKET: 545 mpc->mpc_ops->mpo_create_mbuf_from_socket = 546 mpe->mpe_function; 547 break; 548 case MAC_CREATE_PIPE: 549 mpc->mpc_ops->mpo_create_pipe = 550 mpe->mpe_function; 551 break; 552 case MAC_CREATE_SOCKET: 553 mpc->mpc_ops->mpo_create_socket = 554 mpe->mpe_function; 555 break; 556 case MAC_CREATE_SOCKET_FROM_SOCKET: 557 mpc->mpc_ops->mpo_create_socket_from_socket = 558 mpe->mpe_function; 559 break; 560 case MAC_RELABEL_PIPE: 561 mpc->mpc_ops->mpo_relabel_pipe = 562 mpe->mpe_function; 563 break; 564 case MAC_RELABEL_SOCKET: 565 mpc->mpc_ops->mpo_relabel_socket = 566 mpe->mpe_function; 567 break; 568 case MAC_SET_SOCKET_PEER_FROM_MBUF: 569 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf = 570 mpe->mpe_function; 571 break; 572 case MAC_SET_SOCKET_PEER_FROM_SOCKET: 573 mpc->mpc_ops->mpo_set_socket_peer_from_socket = 574 mpe->mpe_function; 575 break; 576 case MAC_CREATE_BPFDESC: 577 mpc->mpc_ops->mpo_create_bpfdesc = 578 mpe->mpe_function; 579 break; 580 case MAC_CREATE_DATAGRAM_FROM_IPQ: 581 mpc->mpc_ops->mpo_create_datagram_from_ipq = 582 mpe->mpe_function; 583 break; 584 case MAC_CREATE_FRAGMENT: 585 mpc->mpc_ops->mpo_create_fragment = 586 mpe->mpe_function; 587 break; 588 case MAC_CREATE_IFNET: 589 mpc->mpc_ops->mpo_create_ifnet = 590 mpe->mpe_function; 591 break; 592 case MAC_CREATE_IPQ: 593 mpc->mpc_ops->mpo_create_ipq = 594 mpe->mpe_function; 595 break; 596 case MAC_CREATE_MBUF_FROM_MBUF: 597 mpc->mpc_ops->mpo_create_mbuf_from_mbuf = 598 mpe->mpe_function; 599 break; 600 case MAC_CREATE_MBUF_LINKLAYER: 601 mpc->mpc_ops->mpo_create_mbuf_linklayer = 602 mpe->mpe_function; 603 break; 604 case MAC_CREATE_MBUF_FROM_BPFDESC: 605 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc = 606 mpe->mpe_function; 607 break; 608 case MAC_CREATE_MBUF_FROM_IFNET: 609 mpc->mpc_ops->mpo_create_mbuf_from_ifnet = 610 mpe->mpe_function; 611 break; 612 case MAC_CREATE_MBUF_MULTICAST_ENCAP: 613 mpc->mpc_ops->mpo_create_mbuf_multicast_encap = 614 mpe->mpe_function; 615 break; 616 case MAC_CREATE_MBUF_NETLAYER: 617 mpc->mpc_ops->mpo_create_mbuf_netlayer = 618 mpe->mpe_function; 619 break; 620 case MAC_FRAGMENT_MATCH: 621 mpc->mpc_ops->mpo_fragment_match = 622 mpe->mpe_function; 623 break; 624 case MAC_RELABEL_IFNET: 625 mpc->mpc_ops->mpo_relabel_ifnet = 626 mpe->mpe_function; 627 break; 628 case MAC_UPDATE_IPQ: 629 mpc->mpc_ops->mpo_update_ipq = 630 mpe->mpe_function; 631 break; 632 case MAC_CREATE_CRED: 633 mpc->mpc_ops->mpo_create_cred = 634 mpe->mpe_function; 635 break; 636 case MAC_EXECVE_TRANSITION: 637 mpc->mpc_ops->mpo_execve_transition = 638 mpe->mpe_function; 639 break; 640 case MAC_EXECVE_WILL_TRANSITION: 641 mpc->mpc_ops->mpo_execve_will_transition = 642 mpe->mpe_function; 643 break; 644 case MAC_CREATE_PROC0: 645 mpc->mpc_ops->mpo_create_proc0 = mpe->mpe_function; 646 break; 647 case MAC_CREATE_PROC1: 648 mpc->mpc_ops->mpo_create_proc1 = mpe->mpe_function; 649 break; 650 case MAC_RELABEL_CRED: 651 mpc->mpc_ops->mpo_relabel_cred = 652 mpe->mpe_function; 653 break; 654 case MAC_CHECK_BPFDESC_RECEIVE: 655 mpc->mpc_ops->mpo_check_bpfdesc_receive = 656 mpe->mpe_function; 657 break; 658 case MAC_CHECK_CRED_RELABEL: 659 mpc->mpc_ops->mpo_check_cred_relabel = 660 mpe->mpe_function; 661 break; 662 case MAC_CHECK_CRED_VISIBLE: 663 mpc->mpc_ops->mpo_check_cred_visible = 664 mpe->mpe_function; 665 break; 666 case MAC_CHECK_IFNET_RELABEL: 667 mpc->mpc_ops->mpo_check_ifnet_relabel = 668 mpe->mpe_function; 669 break; 670 case MAC_CHECK_IFNET_TRANSMIT: 671 mpc->mpc_ops->mpo_check_ifnet_transmit = 672 mpe->mpe_function; 673 break; 674 case MAC_CHECK_MOUNT_STAT: 675 mpc->mpc_ops->mpo_check_mount_stat = 676 mpe->mpe_function; 677 break; 678 case MAC_CHECK_PIPE_IOCTL: 679 mpc->mpc_ops->mpo_check_pipe_ioctl = 680 mpe->mpe_function; 681 break; 682 case MAC_CHECK_PIPE_POLL: 683 mpc->mpc_ops->mpo_check_pipe_poll = 684 mpe->mpe_function; 685 break; 686 case MAC_CHECK_PIPE_READ: 687 mpc->mpc_ops->mpo_check_pipe_read = 688 mpe->mpe_function; 689 break; 690 case MAC_CHECK_PIPE_RELABEL: 691 mpc->mpc_ops->mpo_check_pipe_relabel = 692 mpe->mpe_function; 693 break; 694 case MAC_CHECK_PIPE_STAT: 695 mpc->mpc_ops->mpo_check_pipe_stat = 696 mpe->mpe_function; 697 break; 698 case MAC_CHECK_PIPE_WRITE: 699 mpc->mpc_ops->mpo_check_pipe_write = 700 mpe->mpe_function; 701 break; 702 case MAC_CHECK_PROC_DEBUG: 703 mpc->mpc_ops->mpo_check_proc_debug = 704 mpe->mpe_function; 705 break; 706 case MAC_CHECK_PROC_SCHED: 707 mpc->mpc_ops->mpo_check_proc_sched = 708 mpe->mpe_function; 709 break; 710 case MAC_CHECK_PROC_SIGNAL: 711 mpc->mpc_ops->mpo_check_proc_signal = 712 mpe->mpe_function; 713 break; 714 case MAC_CHECK_SOCKET_BIND: 715 mpc->mpc_ops->mpo_check_socket_bind = 716 mpe->mpe_function; 717 break; 718 case MAC_CHECK_SOCKET_CONNECT: 719 mpc->mpc_ops->mpo_check_socket_connect = 720 mpe->mpe_function; 721 break; 722 case MAC_CHECK_SOCKET_DELIVER: 723 mpc->mpc_ops->mpo_check_socket_deliver = 724 mpe->mpe_function; 725 break; 726 case MAC_CHECK_SOCKET_LISTEN: 727 mpc->mpc_ops->mpo_check_socket_listen = 728 mpe->mpe_function; 729 break; 730 case MAC_CHECK_SOCKET_RELABEL: 731 mpc->mpc_ops->mpo_check_socket_relabel = 732 mpe->mpe_function; 733 break; 734 case MAC_CHECK_SOCKET_VISIBLE: 735 mpc->mpc_ops->mpo_check_socket_visible = 736 mpe->mpe_function; 737 break; 738 case MAC_CHECK_VNODE_ACCESS: 739 mpc->mpc_ops->mpo_check_vnode_access = 740 mpe->mpe_function; 741 break; 742 case MAC_CHECK_VNODE_CHDIR: 743 mpc->mpc_ops->mpo_check_vnode_chdir = 744 mpe->mpe_function; 745 break; 746 case MAC_CHECK_VNODE_CHROOT: 747 mpc->mpc_ops->mpo_check_vnode_chroot = 748 mpe->mpe_function; 749 break; 750 case MAC_CHECK_VNODE_CREATE: 751 mpc->mpc_ops->mpo_check_vnode_create = 752 mpe->mpe_function; 753 break; 754 case MAC_CHECK_VNODE_DELETE: 755 mpc->mpc_ops->mpo_check_vnode_delete = 756 mpe->mpe_function; 757 break; 758 case MAC_CHECK_VNODE_DELETEACL: 759 mpc->mpc_ops->mpo_check_vnode_deleteacl = 760 mpe->mpe_function; 761 break; 762 case MAC_CHECK_VNODE_EXEC: 763 mpc->mpc_ops->mpo_check_vnode_exec = 764 mpe->mpe_function; 765 break; 766 case MAC_CHECK_VNODE_GETACL: 767 mpc->mpc_ops->mpo_check_vnode_getacl = 768 mpe->mpe_function; 769 break; 770 case MAC_CHECK_VNODE_GETEXTATTR: 771 mpc->mpc_ops->mpo_check_vnode_getextattr = 772 mpe->mpe_function; 773 break; 774 case MAC_CHECK_VNODE_LOOKUP: 775 mpc->mpc_ops->mpo_check_vnode_lookup = 776 mpe->mpe_function; 777 break; 778 case MAC_CHECK_VNODE_MMAP_PERMS: 779 mpc->mpc_ops->mpo_check_vnode_mmap_perms = 780 mpe->mpe_function; 781 break; 782 case MAC_CHECK_VNODE_OPEN: 783 mpc->mpc_ops->mpo_check_vnode_open = 784 mpe->mpe_function; 785 break; 786 case MAC_CHECK_VNODE_POLL: 787 mpc->mpc_ops->mpo_check_vnode_poll = 788 mpe->mpe_function; 789 break; 790 case MAC_CHECK_VNODE_READ: 791 mpc->mpc_ops->mpo_check_vnode_read = 792 mpe->mpe_function; 793 break; 794 case MAC_CHECK_VNODE_READDIR: 795 mpc->mpc_ops->mpo_check_vnode_readdir = 796 mpe->mpe_function; 797 break; 798 case MAC_CHECK_VNODE_READLINK: 799 mpc->mpc_ops->mpo_check_vnode_readlink = 800 mpe->mpe_function; 801 break; 802 case MAC_CHECK_VNODE_RELABEL: 803 mpc->mpc_ops->mpo_check_vnode_relabel = 804 mpe->mpe_function; 805 break; 806 case MAC_CHECK_VNODE_RENAME_FROM: 807 mpc->mpc_ops->mpo_check_vnode_rename_from = 808 mpe->mpe_function; 809 break; 810 case MAC_CHECK_VNODE_RENAME_TO: 811 mpc->mpc_ops->mpo_check_vnode_rename_to = 812 mpe->mpe_function; 813 break; 814 case MAC_CHECK_VNODE_REVOKE: 815 mpc->mpc_ops->mpo_check_vnode_revoke = 816 mpe->mpe_function; 817 break; 818 case MAC_CHECK_VNODE_SETACL: 819 mpc->mpc_ops->mpo_check_vnode_setacl = 820 mpe->mpe_function; 821 break; 822 case MAC_CHECK_VNODE_SETEXTATTR: 823 mpc->mpc_ops->mpo_check_vnode_setextattr = 824 mpe->mpe_function; 825 break; 826 case MAC_CHECK_VNODE_SETFLAGS: 827 mpc->mpc_ops->mpo_check_vnode_setflags = 828 mpe->mpe_function; 829 break; 830 case MAC_CHECK_VNODE_SETMODE: 831 mpc->mpc_ops->mpo_check_vnode_setmode = 832 mpe->mpe_function; 833 break; 834 case MAC_CHECK_VNODE_SETOWNER: 835 mpc->mpc_ops->mpo_check_vnode_setowner = 836 mpe->mpe_function; 837 break; 838 case MAC_CHECK_VNODE_SETUTIMES: 839 mpc->mpc_ops->mpo_check_vnode_setutimes = 840 mpe->mpe_function; 841 break; 842 case MAC_CHECK_VNODE_STAT: 843 mpc->mpc_ops->mpo_check_vnode_stat = 844 mpe->mpe_function; 845 break; 846 case MAC_CHECK_VNODE_WRITE: 847 mpc->mpc_ops->mpo_check_vnode_write = 848 mpe->mpe_function; 849 break; 850 /* 851 default: 852 printf("MAC policy `%s': unknown operation %d\n", 853 mpc->mpc_name, mpe->mpe_constant); 854 return (EINVAL); 855 */ 856 } 857 } 858 MAC_POLICY_LIST_LOCK(); 859 if (mac_policy_list_busy > 0) { 860 MAC_POLICY_LIST_UNLOCK(); 861 FREE(mpc->mpc_ops, M_MACOPVEC); 862 mpc->mpc_ops = NULL; 863 return (EBUSY); 864 } 865 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { 866 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { 867 MAC_POLICY_LIST_UNLOCK(); 868 FREE(mpc->mpc_ops, M_MACOPVEC); 869 mpc->mpc_ops = NULL; 870 return (EEXIST); 871 } 872 } 873 if (mpc->mpc_field_off != NULL) { 874 slot = ffs(mac_policy_offsets_free); 875 if (slot == 0) { 876 MAC_POLICY_LIST_UNLOCK(); 877 FREE(mpc->mpc_ops, M_MACOPVEC); 878 mpc->mpc_ops = NULL; 879 return (ENOMEM); 880 } 881 slot--; 882 mac_policy_offsets_free &= ~(1 << slot); 883 *mpc->mpc_field_off = slot; 884 } 885 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED; 886 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list); 887 888 /* Per-policy initialization. */ 889 if (mpc->mpc_ops->mpo_init != NULL) 890 (*(mpc->mpc_ops->mpo_init))(mpc); 891 MAC_POLICY_LIST_UNLOCK(); 892 893 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname, 894 mpc->mpc_name); 895 896 return (0); 897 } 898 899 static int 900 mac_policy_unregister(struct mac_policy_conf *mpc) 901 { 902 903 #if 0 904 /* 905 * Don't allow unloading modules with private data. 906 */ 907 if (mpc->mpc_field_off != NULL) 908 return (EBUSY); 909 #endif 910 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) 911 return (EBUSY); 912 MAC_POLICY_LIST_LOCK(); 913 if (mac_policy_list_busy > 0) { 914 MAC_POLICY_LIST_UNLOCK(); 915 return (EBUSY); 916 } 917 if (mpc->mpc_ops->mpo_destroy != NULL) 918 (*(mpc->mpc_ops->mpo_destroy))(mpc); 919 920 LIST_REMOVE(mpc, mpc_list); 921 MAC_POLICY_LIST_UNLOCK(); 922 923 FREE(mpc->mpc_ops, M_MACOPVEC); 924 mpc->mpc_ops = NULL; 925 926 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname, 927 mpc->mpc_name); 928 929 return (0); 930 } 931 932 /* 933 * Define an error value precedence, and given two arguments, selects the 934 * value with the higher precedence. 935 */ 936 static int 937 error_select(int error1, int error2) 938 { 939 940 /* Certain decision-making errors take top priority. */ 941 if (error1 == EDEADLK || error2 == EDEADLK) 942 return (EDEADLK); 943 944 /* Invalid arguments should be reported where possible. */ 945 if (error1 == EINVAL || error2 == EINVAL) 946 return (EINVAL); 947 948 /* Precedence goes to "visibility", with both process and file. */ 949 if (error1 == ESRCH || error2 == ESRCH) 950 return (ESRCH); 951 952 if (error1 == ENOENT || error2 == ENOENT) 953 return (ENOENT); 954 955 /* Precedence goes to DAC/MAC protections. */ 956 if (error1 == EACCES || error2 == EACCES) 957 return (EACCES); 958 959 /* Precedence goes to privilege. */ 960 if (error1 == EPERM || error2 == EPERM) 961 return (EPERM); 962 963 /* Precedence goes to error over success; otherwise, arbitrary. */ 964 if (error1 != 0) 965 return (error1); 966 return (error2); 967 } 968 969 void 970 mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp) 971 { 972 973 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label); 974 } 975 976 void 977 mac_update_procfsvnode(struct vnode *vp, struct ucred *cred) 978 { 979 980 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred); 981 } 982 983 /* 984 * Support callout for policies that manage their own externalization 985 * using extended attributes. 986 */ 987 static int 988 mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp) 989 { 990 int error; 991 992 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp, 993 &mp->mnt_fslabel); 994 995 return (error); 996 } 997 998 /* 999 * Given an externalized mac label, internalize it and stamp it on a 1000 * vnode. 1001 */ 1002 static int 1003 mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac) 1004 { 1005 int error; 1006 1007 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac); 1008 1009 return (error); 1010 } 1011 1012 /* 1013 * Call out to individual policies to update the label in a vnode from 1014 * the mountpoint. 1015 */ 1016 void 1017 mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp) 1018 { 1019 1020 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp, 1021 &mp->mnt_fslabel); 1022 1023 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount"); 1024 if (mac_cache_fslabel_in_vnode) 1025 vp->v_vflag |= VV_CACHEDLABEL; 1026 } 1027 1028 /* 1029 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes 1030 * to store label data. Can be referenced by filesystems supporting 1031 * extended attributes. 1032 */ 1033 int 1034 vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap) 1035 { 1036 struct vnode *vp = ap->a_vp; 1037 struct mac extmac; 1038 int buflen, error; 1039 1040 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea"); 1041 1042 /* 1043 * Call out to external policies first. Order doesn't really 1044 * matter, as long as failure of one assures failure of all. 1045 */ 1046 error = mac_update_vnode_from_extattr(vp, vp->v_mount); 1047 if (error) 1048 return (error); 1049 1050 buflen = sizeof(extmac); 1051 error = vn_extattr_get(vp, IO_NODELOCKED, 1052 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen, 1053 (char *)&extmac, curthread); 1054 switch (error) { 1055 case 0: 1056 /* Got it */ 1057 break; 1058 1059 case ENOATTR: 1060 /* 1061 * Use the label from the mount point. 1062 */ 1063 mac_update_vnode_from_mount(vp, vp->v_mount); 1064 return (0); 1065 1066 case EOPNOTSUPP: 1067 default: 1068 /* Fail horribly. */ 1069 return (error); 1070 } 1071 1072 if (buflen != sizeof(extmac)) 1073 error = EPERM; /* Fail very closed. */ 1074 if (error == 0) 1075 error = mac_update_vnode_from_externalized(vp, &extmac); 1076 if (error == 0) 1077 vp->v_vflag |= VV_CACHEDLABEL; 1078 else { 1079 struct vattr va; 1080 1081 printf("Corrupted label on %s", 1082 vp->v_mount->mnt_stat.f_mntonname); 1083 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0) 1084 printf(" inum %ld", va.va_fileid); 1085 #ifdef MAC_DEBUG 1086 if (mac_debug_label_fallback) { 1087 printf(", falling back.\n"); 1088 mac_update_vnode_from_mount(vp, vp->v_mount); 1089 error = 0; 1090 } else { 1091 #endif 1092 printf(".\n"); 1093 error = EPERM; 1094 #ifdef MAC_DEBUG 1095 } 1096 #endif 1097 } 1098 1099 return (error); 1100 } 1101 1102 /* 1103 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle 1104 * the labeling activity outselves. Filesystems should be careful not 1105 * to change their minds regarding whether they support vop_refreshlabel() 1106 * for a vnode or not. Don't cache the vnode here, allow the file 1107 * system code to determine if it's safe to cache. If we update from 1108 * the mount, don't cache since a change to the mount label should affect 1109 * all vnodes. 1110 */ 1111 static int 1112 vn_refreshlabel(struct vnode *vp, struct ucred *cred) 1113 { 1114 int error; 1115 1116 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel"); 1117 1118 if (vp->v_mount == NULL) { 1119 /* 1120 Eventually, we probably want to special-case refreshing 1121 of deadfs vnodes, and if there's a lock-free race somewhere, 1122 that case might be handled here. 1123 1124 mac_update_vnode_deadfs(vp); 1125 return (0); 1126 */ 1127 /* printf("vn_refreshlabel: null v_mount\n"); */ 1128 if (vp->v_type != VNON) 1129 printf( 1130 "vn_refreshlabel: null v_mount with non-VNON\n"); 1131 return (EBADF); 1132 } 1133 1134 if (vp->v_vflag & VV_CACHEDLABEL) { 1135 mac_vnode_label_cache_hits++; 1136 return (0); 1137 } else 1138 mac_vnode_label_cache_misses++; 1139 1140 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) { 1141 mac_update_vnode_from_mount(vp, vp->v_mount); 1142 return (0); 1143 } 1144 1145 error = VOP_REFRESHLABEL(vp, cred, curthread); 1146 switch (error) { 1147 case EOPNOTSUPP: 1148 /* 1149 * If labels are not supported on this vnode, fall back to 1150 * the label in the mount and propagate it to the vnode. 1151 * There should probably be some sort of policy/flag/decision 1152 * about doing this. 1153 */ 1154 mac_update_vnode_from_mount(vp, vp->v_mount); 1155 error = 0; 1156 default: 1157 return (error); 1158 } 1159 } 1160 1161 /* 1162 * Helper function for file systems using the vop_std*_ea() calls. This 1163 * function must be called after EA service is available for the vnode, 1164 * but before it's hooked up to the namespace so that the node persists 1165 * if there's a crash, or before it can be accessed. On successful 1166 * commit of the label to disk (etc), do cache the label. 1167 */ 1168 int 1169 vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred) 1170 { 1171 struct mac extmac; 1172 int error; 1173 1174 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea"); 1175 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) { 1176 mac_update_vnode_from_mount(tvp, tvp->v_mount); 1177 } else { 1178 error = vn_refreshlabel(dvp, cred); 1179 if (error) 1180 return (error); 1181 1182 /* 1183 * Stick the label in the vnode. Then try to write to 1184 * disk. If we fail, return a failure to abort the 1185 * create operation. Really, this failure shouldn't 1186 * happen except in fairly unusual circumstances (out 1187 * of disk, etc). 1188 */ 1189 mac_create_vnode(cred, dvp, tvp); 1190 1191 error = mac_stdcreatevnode_ea(tvp); 1192 if (error) 1193 return (error); 1194 1195 /* 1196 * XXX: Eventually this will go away and all policies will 1197 * directly manage their extended attributes. 1198 */ 1199 error = mac_externalize(&tvp->v_label, &extmac); 1200 if (error) 1201 return (error); 1202 1203 error = vn_extattr_set(tvp, IO_NODELOCKED, 1204 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, 1205 sizeof(extmac), (char *)&extmac, curthread); 1206 if (error == 0) 1207 tvp->v_vflag |= VV_CACHEDLABEL; 1208 else { 1209 #if 0 1210 /* 1211 * In theory, we could have fall-back behavior here. 1212 * It would probably be incorrect. 1213 */ 1214 #endif 1215 return (error); 1216 } 1217 } 1218 1219 return (0); 1220 } 1221 1222 void 1223 mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp) 1224 { 1225 int error; 1226 1227 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 1228 1229 error = vn_refreshlabel(vp, old); 1230 if (error) { 1231 printf("mac_execve_transition: vn_refreshlabel returned %d\n", 1232 error); 1233 printf("mac_execve_transition: using old vnode label\n"); 1234 } 1235 1236 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label); 1237 } 1238 1239 int 1240 mac_execve_will_transition(struct ucred *old, struct vnode *vp) 1241 { 1242 int error, result; 1243 1244 error = vn_refreshlabel(vp, old); 1245 if (error) 1246 return (error); 1247 1248 result = 0; 1249 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label); 1250 1251 return (result); 1252 } 1253 1254 static void 1255 mac_init_label(struct label *label) 1256 { 1257 1258 bzero(label, sizeof(*label)); 1259 label->l_flags = MAC_FLAG_INITIALIZED; 1260 } 1261 1262 static void 1263 mac_init_structmac(struct mac *mac) 1264 { 1265 1266 bzero(mac, sizeof(*mac)); 1267 mac->m_macflags = MAC_FLAG_INITIALIZED; 1268 } 1269 1270 static void 1271 mac_destroy_label(struct label *label) 1272 { 1273 1274 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED, 1275 ("destroying uninitialized label")); 1276 1277 bzero(label, sizeof(*label)); 1278 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */ 1279 } 1280 1281 int 1282 mac_init_mbuf(struct mbuf *m, int how) 1283 { 1284 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf")); 1285 1286 /* "how" is one of M_(TRY|DONT)WAIT */ 1287 mac_init_label(&m->m_pkthdr.label); 1288 MAC_PERFORM(init_mbuf, m, how, &m->m_pkthdr.label); 1289 #ifdef MAC_DEBUG 1290 atomic_add_int(&nmacmbufs, 1); 1291 #endif 1292 return (0); 1293 } 1294 1295 void 1296 mac_destroy_mbuf(struct mbuf *m) 1297 { 1298 1299 MAC_PERFORM(destroy_mbuf, m, &m->m_pkthdr.label); 1300 mac_destroy_label(&m->m_pkthdr.label); 1301 #ifdef MAC_DEBUG 1302 atomic_subtract_int(&nmacmbufs, 1); 1303 #endif 1304 } 1305 1306 void 1307 mac_init_cred(struct ucred *cr) 1308 { 1309 1310 mac_init_label(&cr->cr_label); 1311 MAC_PERFORM(init_cred, cr, &cr->cr_label); 1312 #ifdef MAC_DEBUG 1313 atomic_add_int(&nmaccreds, 1); 1314 #endif 1315 } 1316 1317 void 1318 mac_destroy_cred(struct ucred *cr) 1319 { 1320 1321 MAC_PERFORM(destroy_cred, cr, &cr->cr_label); 1322 mac_destroy_label(&cr->cr_label); 1323 #ifdef MAC_DEBUG 1324 atomic_subtract_int(&nmaccreds, 1); 1325 #endif 1326 } 1327 1328 void 1329 mac_init_ifnet(struct ifnet *ifp) 1330 { 1331 1332 mac_init_label(&ifp->if_label); 1333 MAC_PERFORM(init_ifnet, ifp, &ifp->if_label); 1334 #ifdef MAC_DEBUG 1335 atomic_add_int(&nmacifnets, 1); 1336 #endif 1337 } 1338 1339 void 1340 mac_destroy_ifnet(struct ifnet *ifp) 1341 { 1342 1343 MAC_PERFORM(destroy_ifnet, ifp, &ifp->if_label); 1344 mac_destroy_label(&ifp->if_label); 1345 #ifdef MAC_DEBUG 1346 atomic_subtract_int(&nmacifnets, 1); 1347 #endif 1348 } 1349 1350 void 1351 mac_init_ipq(struct ipq *ipq) 1352 { 1353 1354 mac_init_label(&ipq->ipq_label); 1355 MAC_PERFORM(init_ipq, ipq, &ipq->ipq_label); 1356 #ifdef MAC_DEBUG 1357 atomic_add_int(&nmacipqs, 1); 1358 #endif 1359 } 1360 1361 void 1362 mac_destroy_ipq(struct ipq *ipq) 1363 { 1364 1365 MAC_PERFORM(destroy_ipq, ipq, &ipq->ipq_label); 1366 mac_destroy_label(&ipq->ipq_label); 1367 #ifdef MAC_DEBUG 1368 atomic_subtract_int(&nmacipqs, 1); 1369 #endif 1370 } 1371 1372 void 1373 mac_init_socket(struct socket *socket) 1374 { 1375 1376 mac_init_label(&socket->so_label); 1377 mac_init_label(&socket->so_peerlabel); 1378 MAC_PERFORM(init_socket, socket, &socket->so_label, 1379 &socket->so_peerlabel); 1380 #ifdef MAC_DEBUG 1381 atomic_add_int(&nmacsockets, 1); 1382 #endif 1383 } 1384 1385 void 1386 mac_destroy_socket(struct socket *socket) 1387 { 1388 1389 MAC_PERFORM(destroy_socket, socket, &socket->so_label, 1390 &socket->so_peerlabel); 1391 mac_destroy_label(&socket->so_label); 1392 mac_destroy_label(&socket->so_peerlabel); 1393 #ifdef MAC_DEBUG 1394 atomic_subtract_int(&nmacsockets, 1); 1395 #endif 1396 } 1397 1398 void 1399 mac_init_pipe(struct pipe *pipe) 1400 { 1401 struct label *label; 1402 1403 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK); 1404 mac_init_label(label); 1405 pipe->pipe_label = label; 1406 pipe->pipe_peer->pipe_label = label; 1407 MAC_PERFORM(init_pipe, pipe, pipe->pipe_label); 1408 #ifdef MAC_DEBUG 1409 atomic_add_int(&nmacpipes, 1); 1410 #endif 1411 } 1412 1413 void 1414 mac_destroy_pipe(struct pipe *pipe) 1415 { 1416 1417 MAC_PERFORM(destroy_pipe, pipe, pipe->pipe_label); 1418 mac_destroy_label(pipe->pipe_label); 1419 free(pipe->pipe_label, M_MACPIPELABEL); 1420 #ifdef MAC_DEBUG 1421 atomic_subtract_int(&nmacpipes, 1); 1422 #endif 1423 } 1424 1425 void 1426 mac_init_bpfdesc(struct bpf_d *bpf_d) 1427 { 1428 1429 mac_init_label(&bpf_d->bd_label); 1430 MAC_PERFORM(init_bpfdesc, bpf_d, &bpf_d->bd_label); 1431 #ifdef MAC_DEBUG 1432 atomic_add_int(&nmacbpfdescs, 1); 1433 #endif 1434 } 1435 1436 void 1437 mac_destroy_bpfdesc(struct bpf_d *bpf_d) 1438 { 1439 1440 MAC_PERFORM(destroy_bpfdesc, bpf_d, &bpf_d->bd_label); 1441 mac_destroy_label(&bpf_d->bd_label); 1442 #ifdef MAC_DEBUG 1443 atomic_subtract_int(&nmacbpfdescs, 1); 1444 #endif 1445 } 1446 1447 void 1448 mac_init_mount(struct mount *mp) 1449 { 1450 1451 mac_init_label(&mp->mnt_mntlabel); 1452 mac_init_label(&mp->mnt_fslabel); 1453 MAC_PERFORM(init_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel); 1454 #ifdef MAC_DEBUG 1455 atomic_add_int(&nmacmounts, 1); 1456 #endif 1457 } 1458 1459 void 1460 mac_destroy_mount(struct mount *mp) 1461 { 1462 1463 MAC_PERFORM(destroy_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel); 1464 mac_destroy_label(&mp->mnt_fslabel); 1465 mac_destroy_label(&mp->mnt_mntlabel); 1466 #ifdef MAC_DEBUG 1467 atomic_subtract_int(&nmacmounts, 1); 1468 #endif 1469 } 1470 1471 static void 1472 mac_init_temp(struct label *label) 1473 { 1474 1475 mac_init_label(label); 1476 MAC_PERFORM(init_temp, label); 1477 #ifdef MAC_DEBUG 1478 atomic_add_int(&nmactemp, 1); 1479 #endif 1480 } 1481 1482 static void 1483 mac_destroy_temp(struct label *label) 1484 { 1485 1486 MAC_PERFORM(destroy_temp, label); 1487 mac_destroy_label(label); 1488 #ifdef MAC_DEBUG 1489 atomic_subtract_int(&nmactemp, 1); 1490 #endif 1491 } 1492 1493 void 1494 mac_init_vnode(struct vnode *vp) 1495 { 1496 1497 mac_init_label(&vp->v_label); 1498 MAC_PERFORM(init_vnode, vp, &vp->v_label); 1499 #ifdef MAC_DEBUG 1500 atomic_add_int(&nmacvnodes, 1); 1501 #endif 1502 } 1503 1504 void 1505 mac_destroy_vnode(struct vnode *vp) 1506 { 1507 1508 MAC_PERFORM(destroy_vnode, vp, &vp->v_label); 1509 mac_destroy_label(&vp->v_label); 1510 #ifdef MAC_DEBUG 1511 atomic_subtract_int(&nmacvnodes, 1); 1512 #endif 1513 } 1514 1515 void 1516 mac_init_devfsdirent(struct devfs_dirent *de) 1517 { 1518 1519 mac_init_label(&de->de_label); 1520 MAC_PERFORM(init_devfsdirent, de, &de->de_label); 1521 #ifdef MAC_DEBUG 1522 atomic_add_int(&nmacdevfsdirents, 1); 1523 #endif 1524 } 1525 1526 void 1527 mac_destroy_devfsdirent(struct devfs_dirent *de) 1528 { 1529 1530 MAC_PERFORM(destroy_devfsdirent, de, &de->de_label); 1531 mac_destroy_label(&de->de_label); 1532 #ifdef MAC_DEBUG 1533 atomic_subtract_int(&nmacdevfsdirents, 1); 1534 #endif 1535 } 1536 1537 static int 1538 mac_externalize(struct label *label, struct mac *mac) 1539 { 1540 int error; 1541 1542 mac_init_structmac(mac); 1543 MAC_CHECK(externalize, label, mac); 1544 1545 return (error); 1546 } 1547 1548 static int 1549 mac_internalize(struct label *label, struct mac *mac) 1550 { 1551 int error; 1552 1553 mac_init_temp(label); 1554 MAC_CHECK(internalize, label, mac); 1555 if (error) 1556 mac_destroy_temp(label); 1557 1558 return (error); 1559 } 1560 1561 /* 1562 * Initialize MAC label for the first kernel process, from which other 1563 * kernel processes and threads are spawned. 1564 */ 1565 void 1566 mac_create_proc0(struct ucred *cred) 1567 { 1568 1569 MAC_PERFORM(create_proc0, cred); 1570 } 1571 1572 /* 1573 * Initialize MAC label for the first userland process, from which other 1574 * userland processes and threads are spawned. 1575 */ 1576 void 1577 mac_create_proc1(struct ucred *cred) 1578 { 1579 1580 MAC_PERFORM(create_proc1, cred); 1581 } 1582 1583 /* 1584 * When a new process is created, its label must be initialized. Generally, 1585 * this involves inheritence from the parent process, modulo possible 1586 * deltas. This function allows that processing to take place. 1587 */ 1588 void 1589 mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred) 1590 { 1591 1592 MAC_PERFORM(create_cred, parent_cred, child_cred); 1593 } 1594 1595 int 1596 mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags) 1597 { 1598 int error; 1599 1600 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 1601 1602 if (!mac_enforce_fs) 1603 return (0); 1604 1605 error = vn_refreshlabel(vp, cred); 1606 if (error) 1607 return (error); 1608 1609 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags); 1610 return (error); 1611 } 1612 1613 int 1614 mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 1615 { 1616 int error; 1617 1618 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 1619 1620 if (!mac_enforce_fs) 1621 return (0); 1622 1623 error = vn_refreshlabel(dvp, cred); 1624 if (error) 1625 return (error); 1626 1627 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label); 1628 return (error); 1629 } 1630 1631 int 1632 mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 1633 { 1634 int error; 1635 1636 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 1637 1638 if (!mac_enforce_fs) 1639 return (0); 1640 1641 error = vn_refreshlabel(dvp, cred); 1642 if (error) 1643 return (error); 1644 1645 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label); 1646 return (error); 1647 } 1648 1649 int 1650 mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1651 struct componentname *cnp, struct vattr *vap) 1652 { 1653 int error; 1654 1655 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 1656 1657 if (!mac_enforce_fs) 1658 return (0); 1659 1660 error = vn_refreshlabel(dvp, cred); 1661 if (error) 1662 return (error); 1663 1664 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap); 1665 return (error); 1666 } 1667 1668 int 1669 mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 1670 struct componentname *cnp) 1671 { 1672 int error; 1673 1674 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 1675 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 1676 1677 if (!mac_enforce_fs) 1678 return (0); 1679 1680 error = vn_refreshlabel(dvp, cred); 1681 if (error) 1682 return (error); 1683 error = vn_refreshlabel(vp, cred); 1684 if (error) 1685 return (error); 1686 1687 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp, 1688 &vp->v_label, cnp); 1689 return (error); 1690 } 1691 1692 int 1693 mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1694 acl_type_t type) 1695 { 1696 int error; 1697 1698 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 1699 1700 if (!mac_enforce_fs) 1701 return (0); 1702 1703 error = vn_refreshlabel(vp, cred); 1704 if (error) 1705 return (error); 1706 1707 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type); 1708 return (error); 1709 } 1710 1711 int 1712 mac_check_vnode_exec(struct ucred *cred, struct vnode *vp) 1713 { 1714 int error; 1715 1716 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 1717 1718 if (!mac_enforce_process && !mac_enforce_fs) 1719 return (0); 1720 1721 error = vn_refreshlabel(vp, cred); 1722 if (error) 1723 return (error); 1724 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label); 1725 1726 return (error); 1727 } 1728 1729 int 1730 mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 1731 { 1732 int error; 1733 1734 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 1735 1736 if (!mac_enforce_fs) 1737 return (0); 1738 1739 error = vn_refreshlabel(vp, cred); 1740 if (error) 1741 return (error); 1742 1743 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); 1744 return (error); 1745 } 1746 1747 int 1748 mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1749 int attrnamespace, const char *name, struct uio *uio) 1750 { 1751 int error; 1752 1753 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 1754 1755 if (!mac_enforce_fs) 1756 return (0); 1757 1758 error = vn_refreshlabel(vp, cred); 1759 if (error) 1760 return (error); 1761 1762 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, 1763 attrnamespace, name, uio); 1764 return (error); 1765 } 1766 1767 int 1768 mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 1769 struct componentname *cnp) 1770 { 1771 int error; 1772 1773 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 1774 1775 if (!mac_enforce_fs) 1776 return (0); 1777 1778 error = vn_refreshlabel(dvp, cred); 1779 if (error) 1780 return (error); 1781 1782 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); 1783 return (error); 1784 } 1785 1786 vm_prot_t 1787 mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp, int newmapping) 1788 { 1789 vm_prot_t result = VM_PROT_ALL; 1790 1791 if (!mac_enforce_vm) 1792 return (result); 1793 1794 /* 1795 * This should be some sort of MAC_BITWISE, maybe :) 1796 */ 1797 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_perms"); 1798 MAC_BOOLEAN(check_vnode_mmap_perms, &, cred, vp, &vp->v_label, 1799 newmapping); 1800 return (result); 1801 } 1802 1803 int 1804 mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode) 1805 { 1806 int error; 1807 1808 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 1809 1810 if (!mac_enforce_fs) 1811 return (0); 1812 1813 error = vn_refreshlabel(vp, cred); 1814 if (error) 1815 return (error); 1816 1817 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); 1818 return (error); 1819 } 1820 1821 int 1822 mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 1823 struct vnode *vp) 1824 { 1825 int error; 1826 1827 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 1828 1829 if (!mac_enforce_fs) 1830 return (0); 1831 1832 error = vn_refreshlabel(vp, active_cred); 1833 if (error) 1834 return (error); 1835 1836 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 1837 &vp->v_label); 1838 1839 return (error); 1840 } 1841 1842 int 1843 mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 1844 struct vnode *vp) 1845 { 1846 int error; 1847 1848 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 1849 1850 if (!mac_enforce_fs) 1851 return (0); 1852 1853 error = vn_refreshlabel(vp, active_cred); 1854 if (error) 1855 return (error); 1856 1857 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 1858 &vp->v_label); 1859 1860 return (error); 1861 } 1862 1863 int 1864 mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 1865 { 1866 int error; 1867 1868 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 1869 1870 if (!mac_enforce_fs) 1871 return (0); 1872 1873 error = vn_refreshlabel(dvp, cred); 1874 if (error) 1875 return (error); 1876 1877 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); 1878 return (error); 1879 } 1880 1881 int 1882 mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 1883 { 1884 int error; 1885 1886 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 1887 1888 if (!mac_enforce_fs) 1889 return (0); 1890 1891 error = vn_refreshlabel(vp, cred); 1892 if (error) 1893 return (error); 1894 1895 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); 1896 return (error); 1897 } 1898 1899 static int 1900 mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 1901 struct label *newlabel) 1902 { 1903 int error; 1904 1905 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 1906 1907 error = vn_refreshlabel(vp, cred); 1908 if (error) 1909 return (error); 1910 1911 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); 1912 1913 return (error); 1914 } 1915 1916 int 1917 mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 1918 struct vnode *vp, struct componentname *cnp) 1919 { 1920 int error; 1921 1922 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 1923 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 1924 1925 if (!mac_enforce_fs) 1926 return (0); 1927 1928 error = vn_refreshlabel(dvp, cred); 1929 if (error) 1930 return (error); 1931 error = vn_refreshlabel(vp, cred); 1932 if (error) 1933 return (error); 1934 1935 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, 1936 &vp->v_label, cnp); 1937 return (error); 1938 } 1939 1940 int 1941 mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 1942 struct vnode *vp, int samedir, struct componentname *cnp) 1943 { 1944 int error; 1945 1946 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 1947 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 1948 1949 if (!mac_enforce_fs) 1950 return (0); 1951 1952 error = vn_refreshlabel(dvp, cred); 1953 if (error) 1954 return (error); 1955 if (vp != NULL) { 1956 error = vn_refreshlabel(vp, cred); 1957 if (error) 1958 return (error); 1959 } 1960 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, 1961 vp != NULL ? &vp->v_label : NULL, samedir, cnp); 1962 return (error); 1963 } 1964 1965 int 1966 mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 1967 { 1968 int error; 1969 1970 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 1971 1972 if (!mac_enforce_fs) 1973 return (0); 1974 1975 error = vn_refreshlabel(vp, cred); 1976 if (error) 1977 return (error); 1978 1979 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); 1980 return (error); 1981 } 1982 1983 int 1984 mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 1985 struct acl *acl) 1986 { 1987 int error; 1988 1989 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 1990 1991 if (!mac_enforce_fs) 1992 return (0); 1993 1994 error = vn_refreshlabel(vp, cred); 1995 if (error) 1996 return (error); 1997 1998 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); 1999 return (error); 2000 } 2001 2002 int 2003 mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 2004 int attrnamespace, const char *name, struct uio *uio) 2005 { 2006 int error; 2007 2008 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 2009 2010 if (!mac_enforce_fs) 2011 return (0); 2012 2013 error = vn_refreshlabel(vp, cred); 2014 if (error) 2015 return (error); 2016 2017 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, 2018 attrnamespace, name, uio); 2019 return (error); 2020 } 2021 2022 int 2023 mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 2024 { 2025 int error; 2026 2027 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 2028 2029 if (!mac_enforce_fs) 2030 return (0); 2031 2032 error = vn_refreshlabel(vp, cred); 2033 if (error) 2034 return (error); 2035 2036 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); 2037 return (error); 2038 } 2039 2040 int 2041 mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 2042 { 2043 int error; 2044 2045 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 2046 2047 if (!mac_enforce_fs) 2048 return (0); 2049 2050 error = vn_refreshlabel(vp, cred); 2051 if (error) 2052 return (error); 2053 2054 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); 2055 return (error); 2056 } 2057 2058 int 2059 mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 2060 gid_t gid) 2061 { 2062 int error; 2063 2064 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 2065 2066 if (!mac_enforce_fs) 2067 return (0); 2068 2069 error = vn_refreshlabel(vp, cred); 2070 if (error) 2071 return (error); 2072 2073 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); 2074 return (error); 2075 } 2076 2077 int 2078 mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 2079 struct timespec atime, struct timespec mtime) 2080 { 2081 int error; 2082 2083 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 2084 2085 if (!mac_enforce_fs) 2086 return (0); 2087 2088 error = vn_refreshlabel(vp, cred); 2089 if (error) 2090 return (error); 2091 2092 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, 2093 mtime); 2094 return (error); 2095 } 2096 2097 int 2098 mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2099 struct vnode *vp) 2100 { 2101 int error; 2102 2103 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 2104 2105 if (!mac_enforce_fs) 2106 return (0); 2107 2108 error = vn_refreshlabel(vp, active_cred); 2109 if (error) 2110 return (error); 2111 2112 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 2113 &vp->v_label); 2114 return (error); 2115 } 2116 2117 int 2118 mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 2119 struct vnode *vp) 2120 { 2121 int error; 2122 2123 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 2124 2125 if (!mac_enforce_fs) 2126 return (0); 2127 2128 error = vn_refreshlabel(vp, active_cred); 2129 if (error) 2130 return (error); 2131 2132 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 2133 &vp->v_label); 2134 2135 return (error); 2136 } 2137 2138 /* 2139 * When relabeling a process, call out to the policies for the maximum 2140 * permission allowed for each object type we know about in its 2141 * memory space, and revoke access (in the least surprising ways we 2142 * know) when necessary. The process lock is not held here. 2143 */ 2144 static void 2145 mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) 2146 { 2147 2148 /* XXX freeze all other threads */ 2149 mac_cred_mmapped_drop_perms_recurse(td, cred, 2150 &td->td_proc->p_vmspace->vm_map); 2151 /* XXX allow other threads to continue */ 2152 } 2153 2154 static __inline const char * 2155 prot2str(vm_prot_t prot) 2156 { 2157 2158 switch (prot & VM_PROT_ALL) { 2159 case VM_PROT_READ: 2160 return ("r--"); 2161 case VM_PROT_READ | VM_PROT_WRITE: 2162 return ("rw-"); 2163 case VM_PROT_READ | VM_PROT_EXECUTE: 2164 return ("r-x"); 2165 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 2166 return ("rwx"); 2167 case VM_PROT_WRITE: 2168 return ("-w-"); 2169 case VM_PROT_EXECUTE: 2170 return ("--x"); 2171 case VM_PROT_WRITE | VM_PROT_EXECUTE: 2172 return ("-wx"); 2173 default: 2174 return ("---"); 2175 } 2176 } 2177 2178 static void 2179 mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, 2180 struct vm_map *map) 2181 { 2182 struct vm_map_entry *vme; 2183 vm_prot_t result, revokeperms; 2184 vm_object_t object; 2185 vm_ooffset_t offset; 2186 struct vnode *vp; 2187 2188 if (!mac_mmap_revocation) 2189 return; 2190 2191 vm_map_lock_read(map); 2192 for (vme = map->header.next; vme != &map->header; vme = vme->next) { 2193 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { 2194 mac_cred_mmapped_drop_perms_recurse(td, cred, 2195 vme->object.sub_map); 2196 continue; 2197 } 2198 /* 2199 * Skip over entries that obviously are not shared. 2200 */ 2201 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || 2202 !vme->max_protection) 2203 continue; 2204 /* 2205 * Drill down to the deepest backing object. 2206 */ 2207 offset = vme->offset; 2208 object = vme->object.vm_object; 2209 if (object == NULL) 2210 continue; 2211 while (object->backing_object != NULL) { 2212 object = object->backing_object; 2213 offset += object->backing_object_offset; 2214 } 2215 /* 2216 * At the moment, vm_maps and objects aren't considered 2217 * by the MAC system, so only things with backing by a 2218 * normal object (read: vnodes) are checked. 2219 */ 2220 if (object->type != OBJT_VNODE) 2221 continue; 2222 vp = (struct vnode *)object->handle; 2223 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2224 result = mac_check_vnode_mmap_prot(cred, vp, 0); 2225 VOP_UNLOCK(vp, 0, td); 2226 /* 2227 * Find out what maximum protection we may be allowing 2228 * now but a policy needs to get removed. 2229 */ 2230 revokeperms = vme->max_protection & ~result; 2231 if (!revokeperms) 2232 continue; 2233 printf("pid %ld: revoking %s perms from %#lx:%ld " 2234 "(max %s/cur %s)\n", (long)td->td_proc->p_pid, 2235 prot2str(revokeperms), (u_long)vme->start, 2236 (long)(vme->end - vme->start), 2237 prot2str(vme->max_protection), prot2str(vme->protection)); 2238 vm_map_lock_upgrade(map); 2239 /* 2240 * This is the really simple case: if a map has more 2241 * max_protection than is allowed, but it's not being 2242 * actually used (that is, the current protection is 2243 * still allowed), we can just wipe it out and do 2244 * nothing more. 2245 */ 2246 if ((vme->protection & revokeperms) == 0) { 2247 vme->max_protection -= revokeperms; 2248 } else { 2249 if (revokeperms & VM_PROT_WRITE) { 2250 /* 2251 * In the more complicated case, flush out all 2252 * pending changes to the object then turn it 2253 * copy-on-write. 2254 */ 2255 vm_object_reference(object); 2256 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2257 vm_object_page_clean(object, 2258 OFF_TO_IDX(offset), 2259 OFF_TO_IDX(offset + vme->end - vme->start + 2260 PAGE_MASK), 2261 OBJPC_SYNC); 2262 VOP_UNLOCK(vp, 0, td); 2263 vm_object_deallocate(object); 2264 /* 2265 * Why bother if there's no read permissions 2266 * anymore? For the rest, we need to leave 2267 * the write permissions on for COW, or 2268 * remove them entirely if configured to. 2269 */ 2270 if (!mac_mmap_revocation_via_cow) { 2271 vme->max_protection &= ~VM_PROT_WRITE; 2272 vme->protection &= ~VM_PROT_WRITE; 2273 } if ((revokeperms & VM_PROT_READ) == 0) 2274 vme->eflags |= MAP_ENTRY_COW | 2275 MAP_ENTRY_NEEDS_COPY; 2276 } 2277 if (revokeperms & VM_PROT_EXECUTE) { 2278 vme->max_protection &= ~VM_PROT_EXECUTE; 2279 vme->protection &= ~VM_PROT_EXECUTE; 2280 } 2281 if (revokeperms & VM_PROT_READ) { 2282 vme->max_protection = 0; 2283 vme->protection = 0; 2284 } 2285 pmap_protect(map->pmap, vme->start, vme->end, 2286 vme->protection & ~revokeperms); 2287 vm_map_simplify_entry(map, vme); 2288 } 2289 vm_map_lock_downgrade(map); 2290 } 2291 vm_map_unlock_read(map); 2292 } 2293 2294 /* 2295 * When the subject's label changes, it may require revocation of privilege 2296 * to mapped objects. This can't be done on-the-fly later with a unified 2297 * buffer cache. 2298 */ 2299 static void 2300 mac_relabel_cred(struct ucred *cred, struct label *newlabel) 2301 { 2302 2303 MAC_PERFORM(relabel_cred, cred, newlabel); 2304 } 2305 2306 void 2307 mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 2308 { 2309 2310 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); 2311 } 2312 2313 void 2314 mac_create_ifnet(struct ifnet *ifnet) 2315 { 2316 2317 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label); 2318 } 2319 2320 void 2321 mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d) 2322 { 2323 2324 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label); 2325 } 2326 2327 void 2328 mac_create_socket(struct ucred *cred, struct socket *socket) 2329 { 2330 2331 MAC_PERFORM(create_socket, cred, socket, &socket->so_label); 2332 } 2333 2334 void 2335 mac_create_pipe(struct ucred *cred, struct pipe *pipe) 2336 { 2337 2338 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); 2339 } 2340 2341 void 2342 mac_create_socket_from_socket(struct socket *oldsocket, 2343 struct socket *newsocket) 2344 { 2345 2346 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label, 2347 newsocket, &newsocket->so_label); 2348 } 2349 2350 static void 2351 mac_relabel_socket(struct ucred *cred, struct socket *socket, 2352 struct label *newlabel) 2353 { 2354 2355 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); 2356 } 2357 2358 static void 2359 mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) 2360 { 2361 2362 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); 2363 } 2364 2365 void 2366 mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) 2367 { 2368 2369 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label, 2370 socket, &socket->so_peerlabel); 2371 } 2372 2373 void 2374 mac_set_socket_peer_from_socket(struct socket *oldsocket, 2375 struct socket *newsocket) 2376 { 2377 2378 MAC_PERFORM(set_socket_peer_from_socket, oldsocket, 2379 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel); 2380 } 2381 2382 void 2383 mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram) 2384 { 2385 2386 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label, 2387 datagram, &datagram->m_pkthdr.label); 2388 } 2389 2390 void 2391 mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment) 2392 { 2393 2394 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label, 2395 fragment, &fragment->m_pkthdr.label); 2396 } 2397 2398 void 2399 mac_create_ipq(struct mbuf *fragment, struct ipq *ipq) 2400 { 2401 2402 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq, 2403 &ipq->ipq_label); 2404 } 2405 2406 void 2407 mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2408 { 2409 2410 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label, 2411 newmbuf, &newmbuf->m_pkthdr.label); 2412 } 2413 2414 void 2415 mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf) 2416 { 2417 2418 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf, 2419 &mbuf->m_pkthdr.label); 2420 } 2421 2422 void 2423 mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf) 2424 { 2425 2426 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf, 2427 &mbuf->m_pkthdr.label); 2428 } 2429 2430 void 2431 mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf) 2432 { 2433 2434 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf, 2435 &mbuf->m_pkthdr.label); 2436 } 2437 2438 void 2439 mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet, 2440 struct mbuf *newmbuf) 2441 { 2442 2443 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, 2444 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf, 2445 &newmbuf->m_pkthdr.label); 2446 } 2447 2448 void 2449 mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2450 { 2451 2452 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label, 2453 newmbuf, &newmbuf->m_pkthdr.label); 2454 } 2455 2456 int 2457 mac_fragment_match(struct mbuf *fragment, struct ipq *ipq) 2458 { 2459 int result; 2460 2461 result = 1; 2462 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label, 2463 ipq, &ipq->ipq_label); 2464 2465 return (result); 2466 } 2467 2468 void 2469 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq) 2470 { 2471 2472 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq, 2473 &ipq->ipq_label); 2474 } 2475 2476 void 2477 mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) 2478 { 2479 2480 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf, 2481 &mbuf->m_pkthdr.label); 2482 } 2483 2484 void 2485 mac_create_mount(struct ucred *cred, struct mount *mp) 2486 { 2487 2488 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, 2489 &mp->mnt_fslabel); 2490 } 2491 2492 void 2493 mac_create_root_mount(struct ucred *cred, struct mount *mp) 2494 { 2495 2496 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, 2497 &mp->mnt_fslabel); 2498 } 2499 2500 int 2501 mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) 2502 { 2503 int error; 2504 2505 if (!mac_enforce_network) 2506 return (0); 2507 2508 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet, 2509 &ifnet->if_label); 2510 2511 return (error); 2512 } 2513 2514 static int 2515 mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) 2516 { 2517 int error; 2518 2519 MAC_CHECK(check_cred_relabel, cred, newlabel); 2520 2521 return (error); 2522 } 2523 2524 int 2525 mac_check_cred_visible(struct ucred *u1, struct ucred *u2) 2526 { 2527 int error; 2528 2529 if (!mac_enforce_process) 2530 return (0); 2531 2532 MAC_CHECK(check_cred_visible, u1, u2); 2533 2534 return (error); 2535 } 2536 2537 int 2538 mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) 2539 { 2540 int error; 2541 2542 if (!mac_enforce_network) 2543 return (0); 2544 2545 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr")); 2546 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED)) 2547 printf("%s%d: not initialized\n", ifnet->if_name, 2548 ifnet->if_unit); 2549 2550 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf, 2551 &mbuf->m_pkthdr.label); 2552 2553 return (error); 2554 } 2555 2556 int 2557 mac_check_mount_stat(struct ucred *cred, struct mount *mount) 2558 { 2559 int error; 2560 2561 if (!mac_enforce_fs) 2562 return (0); 2563 2564 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); 2565 2566 return (error); 2567 } 2568 2569 int 2570 mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, 2571 void *data) 2572 { 2573 int error; 2574 2575 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2576 2577 if (!mac_enforce_pipe) 2578 return (0); 2579 2580 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); 2581 2582 return (error); 2583 } 2584 2585 int 2586 mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) 2587 { 2588 int error; 2589 2590 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2591 2592 if (!mac_enforce_pipe) 2593 return (0); 2594 2595 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); 2596 2597 return (error); 2598 } 2599 2600 int 2601 mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) 2602 { 2603 int error; 2604 2605 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2606 2607 if (!mac_enforce_pipe) 2608 return (0); 2609 2610 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); 2611 2612 return (error); 2613 } 2614 2615 static int 2616 mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 2617 struct label *newlabel) 2618 { 2619 int error; 2620 2621 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2622 2623 if (!mac_enforce_pipe) 2624 return (0); 2625 2626 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); 2627 2628 return (error); 2629 } 2630 2631 int 2632 mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) 2633 { 2634 int error; 2635 2636 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2637 2638 if (!mac_enforce_pipe) 2639 return (0); 2640 2641 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); 2642 2643 return (error); 2644 } 2645 2646 int 2647 mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) 2648 { 2649 int error; 2650 2651 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2652 2653 if (!mac_enforce_pipe) 2654 return (0); 2655 2656 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); 2657 2658 return (error); 2659 } 2660 2661 int 2662 mac_check_proc_debug(struct ucred *cred, struct proc *proc) 2663 { 2664 int error; 2665 2666 PROC_LOCK_ASSERT(proc, MA_OWNED); 2667 2668 if (!mac_enforce_process) 2669 return (0); 2670 2671 MAC_CHECK(check_proc_debug, cred, proc); 2672 2673 return (error); 2674 } 2675 2676 int 2677 mac_check_proc_sched(struct ucred *cred, struct proc *proc) 2678 { 2679 int error; 2680 2681 PROC_LOCK_ASSERT(proc, MA_OWNED); 2682 2683 if (!mac_enforce_process) 2684 return (0); 2685 2686 MAC_CHECK(check_proc_sched, cred, proc); 2687 2688 return (error); 2689 } 2690 2691 int 2692 mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 2693 { 2694 int error; 2695 2696 PROC_LOCK_ASSERT(proc, MA_OWNED); 2697 2698 if (!mac_enforce_process) 2699 return (0); 2700 2701 MAC_CHECK(check_proc_signal, cred, proc, signum); 2702 2703 return (error); 2704 } 2705 2706 int 2707 mac_check_socket_bind(struct ucred *ucred, struct socket *socket, 2708 struct sockaddr *sockaddr) 2709 { 2710 int error; 2711 2712 if (!mac_enforce_socket) 2713 return (0); 2714 2715 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label, 2716 sockaddr); 2717 2718 return (error); 2719 } 2720 2721 int 2722 mac_check_socket_connect(struct ucred *cred, struct socket *socket, 2723 struct sockaddr *sockaddr) 2724 { 2725 int error; 2726 2727 if (!mac_enforce_socket) 2728 return (0); 2729 2730 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label, 2731 sockaddr); 2732 2733 return (error); 2734 } 2735 2736 int 2737 mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf) 2738 { 2739 int error; 2740 2741 if (!mac_enforce_socket) 2742 return (0); 2743 2744 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf, 2745 &mbuf->m_pkthdr.label); 2746 2747 return (error); 2748 } 2749 2750 int 2751 mac_check_socket_listen(struct ucred *cred, struct socket *socket) 2752 { 2753 int error; 2754 2755 if (!mac_enforce_socket) 2756 return (0); 2757 2758 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label); 2759 return (error); 2760 } 2761 2762 static int 2763 mac_check_socket_relabel(struct ucred *cred, struct socket *socket, 2764 struct label *newlabel) 2765 { 2766 int error; 2767 2768 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label, 2769 newlabel); 2770 2771 return (error); 2772 } 2773 2774 int 2775 mac_check_socket_visible(struct ucred *cred, struct socket *socket) 2776 { 2777 int error; 2778 2779 if (!mac_enforce_socket) 2780 return (0); 2781 2782 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label); 2783 2784 return (error); 2785 } 2786 2787 int 2788 mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 2789 struct ifnet *ifnet) 2790 { 2791 struct mac label; 2792 int error; 2793 2794 error = mac_externalize(&ifnet->if_label, &label); 2795 if (error) 2796 return (error); 2797 2798 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label))); 2799 } 2800 2801 int 2802 mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 2803 struct ifnet *ifnet) 2804 { 2805 struct mac newlabel; 2806 struct label intlabel; 2807 int error; 2808 2809 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel)); 2810 if (error) 2811 return (error); 2812 2813 error = mac_internalize(&intlabel, &newlabel); 2814 if (error) 2815 return (error); 2816 2817 /* 2818 * XXX: Note that this is a redundant privilege check, since 2819 * policies impose this check themselves if required by the 2820 * policy. Eventually, this should go away. 2821 */ 2822 error = suser_cred(cred, 0); 2823 if (error) 2824 goto out; 2825 2826 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label, 2827 &intlabel); 2828 if (error) 2829 goto out; 2830 2831 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel); 2832 2833 out: 2834 mac_destroy_temp(&intlabel); 2835 return (error); 2836 } 2837 2838 void 2839 mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp) 2840 { 2841 2842 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label); 2843 } 2844 2845 void 2846 mac_create_devfs_device(dev_t dev, struct devfs_dirent *de) 2847 { 2848 2849 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label); 2850 } 2851 2852 static int 2853 mac_stdcreatevnode_ea(struct vnode *vp) 2854 { 2855 int error; 2856 2857 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label); 2858 2859 return (error); 2860 } 2861 2862 void 2863 mac_create_devfs_directory(char *dirname, int dirnamelen, 2864 struct devfs_dirent *de) 2865 { 2866 2867 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de, 2868 &de->de_label); 2869 } 2870 2871 /* 2872 * When a new vnode is created, this call will initialize its label. 2873 */ 2874 void 2875 mac_create_vnode(struct ucred *cred, struct vnode *parent, 2876 struct vnode *child) 2877 { 2878 int error; 2879 2880 ASSERT_VOP_LOCKED(parent, "mac_create_vnode"); 2881 ASSERT_VOP_LOCKED(child, "mac_create_vnode"); 2882 2883 error = vn_refreshlabel(parent, cred); 2884 if (error) { 2885 printf("mac_create_vnode: vn_refreshlabel returned %d\n", 2886 error); 2887 printf("mac_create_vnode: using old vnode label\n"); 2888 } 2889 2890 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child, 2891 &child->v_label); 2892 } 2893 2894 int 2895 mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 2896 struct mac *extmac) 2897 { 2898 struct label intlabel; 2899 int error; 2900 2901 error = mac_internalize(&intlabel, extmac); 2902 if (error) 2903 return (error); 2904 2905 mac_check_socket_relabel(cred, so, &intlabel); 2906 if (error) { 2907 mac_destroy_temp(&intlabel); 2908 return (error); 2909 } 2910 2911 mac_relabel_socket(cred, so, &intlabel); 2912 2913 mac_destroy_temp(&intlabel); 2914 return (0); 2915 } 2916 2917 int 2918 mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) 2919 { 2920 int error; 2921 2922 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2923 2924 error = mac_check_pipe_relabel(cred, pipe, label); 2925 if (error) 2926 return (error); 2927 2928 mac_relabel_pipe(cred, pipe, label); 2929 2930 return (0); 2931 } 2932 2933 int 2934 mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 2935 struct mac *extmac) 2936 { 2937 2938 return (mac_externalize(&so->so_label, extmac)); 2939 } 2940 2941 int 2942 mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 2943 struct mac *extmac) 2944 { 2945 2946 return (mac_externalize(&so->so_peerlabel, extmac)); 2947 } 2948 2949 /* 2950 * Implementation of VOP_SETLABEL() that relies on extended attributes 2951 * to store label data. Can be referenced by filesystems supporting 2952 * extended attributes. 2953 */ 2954 int 2955 vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 2956 { 2957 struct vnode *vp = ap->a_vp; 2958 struct label *intlabel = ap->a_label; 2959 struct mac extmac; 2960 int error; 2961 2962 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 2963 2964 /* 2965 * XXX: Eventually call out to EA check/set calls here. 2966 * Be particularly careful to avoid race conditions, 2967 * consistency problems, and stability problems when 2968 * dealing with multiple EAs. In particular, we require 2969 * the ability to write multiple EAs on the same file in 2970 * a single transaction, which the current EA interface 2971 * does not provide. 2972 */ 2973 2974 error = mac_externalize(intlabel, &extmac); 2975 if (error) 2976 return (error); 2977 2978 error = vn_extattr_set(vp, IO_NODELOCKED, 2979 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, 2980 sizeof(extmac), (char *)&extmac, curthread); 2981 if (error) 2982 return (error); 2983 2984 mac_relabel_vnode(ap->a_cred, vp, intlabel); 2985 2986 vp->v_vflag |= VV_CACHEDLABEL; 2987 2988 return (0); 2989 } 2990 2991 static int 2992 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 2993 { 2994 int error; 2995 2996 if (vp->v_mount == NULL) { 2997 /* printf("vn_setlabel: null v_mount\n"); */ 2998 if (vp->v_type != VNON) 2999 printf("vn_setlabel: null v_mount with non-VNON\n"); 3000 return (EBADF); 3001 } 3002 3003 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3004 return (EOPNOTSUPP); 3005 3006 /* 3007 * Multi-phase commit. First check the policies to confirm the 3008 * change is OK. Then commit via the filesystem. Finally, 3009 * update the actual vnode label. Question: maybe the filesystem 3010 * should update the vnode at the end as part of VOP_SETLABEL()? 3011 */ 3012 error = mac_check_vnode_relabel(cred, vp, intlabel); 3013 if (error) 3014 return (error); 3015 3016 /* 3017 * VADMIN provides the opportunity for the filesystem to make 3018 * decisions about who is and is not able to modify labels 3019 * and protections on files. This might not be right. We can't 3020 * assume VOP_SETLABEL() will do it, because we might implement 3021 * that as part of vop_stdsetlabel_ea(). 3022 */ 3023 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 3024 if (error) 3025 return (error); 3026 3027 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 3028 if (error) 3029 return (error); 3030 3031 return (0); 3032 } 3033 3034 /* 3035 * MPSAFE 3036 */ 3037 int 3038 __mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3039 { 3040 struct mac extmac; 3041 int error; 3042 3043 error = mac_externalize(&td->td_ucred->cr_label, &extmac); 3044 if (error == 0) 3045 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3046 3047 return (error); 3048 } 3049 3050 /* 3051 * MPSAFE 3052 */ 3053 int 3054 __mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3055 { 3056 struct ucred *newcred, *oldcred; 3057 struct proc *p; 3058 struct mac extmac; 3059 struct label intlabel; 3060 int error; 3061 3062 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3063 if (error) 3064 return (error); 3065 3066 error = mac_internalize(&intlabel, &extmac); 3067 if (error) 3068 return (error); 3069 3070 newcred = crget(); 3071 3072 p = td->td_proc; 3073 PROC_LOCK(p); 3074 oldcred = p->p_ucred; 3075 3076 error = mac_check_cred_relabel(oldcred, &intlabel); 3077 if (error) { 3078 PROC_UNLOCK(p); 3079 mac_destroy_temp(&intlabel); 3080 crfree(newcred); 3081 return (error); 3082 } 3083 3084 setsugid(p); 3085 crcopy(newcred, oldcred); 3086 mac_relabel_cred(newcred, &intlabel); 3087 p->p_ucred = newcred; 3088 3089 /* 3090 * Grab additional reference for use while revoking mmaps, prior 3091 * to releasing the proc lock and sharing the cred. 3092 */ 3093 crhold(newcred); 3094 PROC_UNLOCK(p); 3095 3096 mtx_lock(&Giant); 3097 mac_cred_mmapped_drop_perms(td, newcred); 3098 mtx_unlock(&Giant); 3099 3100 crfree(newcred); /* Free revocation reference. */ 3101 crfree(oldcred); 3102 mac_destroy_temp(&intlabel); 3103 return (0); 3104 } 3105 3106 /* 3107 * MPSAFE 3108 */ 3109 int 3110 __mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3111 { 3112 struct file *fp; 3113 struct mac extmac; 3114 struct vnode *vp; 3115 struct pipe *pipe; 3116 int error; 3117 3118 mtx_lock(&Giant); 3119 3120 error = fget(td, SCARG(uap, fd), &fp); 3121 if (error) 3122 goto out; 3123 3124 switch (fp->f_type) { 3125 case DTYPE_FIFO: 3126 case DTYPE_VNODE: 3127 vp = (struct vnode *)fp->f_data; 3128 3129 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3130 error = vn_refreshlabel(vp, td->td_ucred); 3131 if (error == 0) 3132 error = mac_externalize(&vp->v_label, &extmac); 3133 VOP_UNLOCK(vp, 0, td); 3134 break; 3135 case DTYPE_PIPE: 3136 pipe = (struct pipe *)fp->f_data; 3137 error = mac_externalize(pipe->pipe_label, &extmac); 3138 break; 3139 default: 3140 error = EINVAL; 3141 } 3142 3143 if (error == 0) 3144 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3145 3146 fdrop(fp, td); 3147 3148 out: 3149 mtx_unlock(&Giant); 3150 return (error); 3151 } 3152 3153 /* 3154 * MPSAFE 3155 */ 3156 int 3157 __mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3158 { 3159 struct nameidata nd; 3160 struct mac extmac; 3161 int error; 3162 3163 mtx_lock(&Giant); 3164 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, 3165 SCARG(uap, path_p), td); 3166 error = namei(&nd); 3167 if (error) 3168 goto out; 3169 3170 error = vn_refreshlabel(nd.ni_vp, td->td_ucred); 3171 if (error == 0) 3172 error = mac_externalize(&nd.ni_vp->v_label, &extmac); 3173 NDFREE(&nd, 0); 3174 if (error) 3175 goto out; 3176 3177 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3178 3179 out: 3180 mtx_unlock(&Giant); 3181 return (error); 3182 } 3183 3184 /* 3185 * MPSAFE 3186 */ 3187 int 3188 __mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3189 { 3190 struct file *fp; 3191 struct mac extmac; 3192 struct label intlabel; 3193 struct mount *mp; 3194 struct vnode *vp; 3195 struct pipe *pipe; 3196 int error; 3197 3198 mtx_lock(&Giant); 3199 error = fget(td, SCARG(uap, fd), &fp); 3200 if (error) 3201 goto out1; 3202 3203 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3204 if (error) 3205 goto out2; 3206 3207 error = mac_internalize(&intlabel, &extmac); 3208 if (error) 3209 goto out2; 3210 3211 switch (fp->f_type) { 3212 case DTYPE_FIFO: 3213 case DTYPE_VNODE: 3214 vp = (struct vnode *)fp->f_data; 3215 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3216 if (error != 0) 3217 break; 3218 3219 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3220 error = vn_setlabel(vp, &intlabel, td->td_ucred); 3221 VOP_UNLOCK(vp, 0, td); 3222 vn_finished_write(mp); 3223 mac_destroy_temp(&intlabel); 3224 break; 3225 case DTYPE_PIPE: 3226 pipe = (struct pipe *)fp->f_data; 3227 PIPE_LOCK(pipe); 3228 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel); 3229 PIPE_UNLOCK(pipe); 3230 break; 3231 default: 3232 error = EINVAL; 3233 } 3234 3235 out2: 3236 fdrop(fp, td); 3237 out1: 3238 mtx_unlock(&Giant); 3239 return (error); 3240 } 3241 3242 /* 3243 * MPSAFE 3244 */ 3245 int 3246 __mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3247 { 3248 struct nameidata nd; 3249 struct mac extmac; 3250 struct label intlabel; 3251 struct mount *mp; 3252 int error; 3253 3254 mtx_lock(&Giant); 3255 3256 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3257 if (error) 3258 goto out; 3259 3260 error = mac_internalize(&intlabel, &extmac); 3261 if (error) 3262 goto out; 3263 3264 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, 3265 SCARG(uap, path_p), td); 3266 error = namei(&nd); 3267 if (error) 3268 goto out2; 3269 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3270 if (error) 3271 goto out2; 3272 3273 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred); 3274 3275 vn_finished_write(mp); 3276 out2: 3277 mac_destroy_temp(&intlabel); 3278 NDFREE(&nd, 0); 3279 out: 3280 mtx_unlock(&Giant); 3281 return (error); 3282 } 3283 3284 int 3285 mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3286 { 3287 struct mac_policy_conf *mpc; 3288 char target[MAC_MAX_POLICY_NAME]; 3289 int error; 3290 3291 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL); 3292 if (error) 3293 return (error); 3294 3295 error = ENOSYS; 3296 MAC_POLICY_LIST_BUSY(); 3297 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3298 if (strcmp(mpc->mpc_name, target) == 0 && 3299 mpc->mpc_ops->mpo_syscall != NULL) { 3300 error = mpc->mpc_ops->mpo_syscall(td, 3301 SCARG(uap, call), SCARG(uap, arg)); 3302 goto out; 3303 } 3304 } 3305 3306 out: 3307 MAC_POLICY_LIST_UNBUSY(); 3308 return (error); 3309 } 3310 3311 SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); 3312 SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); 3313 3314 #else /* !MAC */ 3315 3316 int 3317 __mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3318 { 3319 3320 return (ENOSYS); 3321 } 3322 3323 int 3324 __mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3325 { 3326 3327 return (ENOSYS); 3328 } 3329 3330 int 3331 __mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3332 { 3333 3334 return (ENOSYS); 3335 } 3336 3337 int 3338 __mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3339 { 3340 3341 return (ENOSYS); 3342 } 3343 3344 int 3345 __mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3346 { 3347 3348 return (ENOSYS); 3349 } 3350 3351 int 3352 __mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3353 { 3354 3355 return (ENOSYS); 3356 } 3357 3358 int 3359 mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3360 { 3361 3362 return (ENOSYS); 3363 } 3364 3365 #endif /* !MAC */ 3366