108static unsigned int mac_max_policies = MAC_MAX_POLICIES; 109static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1; 110SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD, 111 &mac_max_policies, 0, ""); 112 113static int mac_late = 0; 114 115static int mac_enforce_fs = 1; 116SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW, 117 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects"); 118TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs); 119 120static int mac_enforce_network = 1; 121SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW, 122 &mac_enforce_network, 0, "Enforce MAC policy on network packets"); 123TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network); 124 125static int mac_enforce_pipe = 1; 126SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW, 127 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations"); 128TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe); 129 130static int mac_enforce_process = 1; 131SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW, 132 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations"); 133TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process); 134 135static int mac_enforce_socket = 1; 136SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW, 137 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations"); 138TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket); 139 140static int mac_enforce_vm = 1; 141SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW, 142 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations"); 143TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm); 144 145static int mac_label_size = sizeof(struct mac); 146SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD, 147 &mac_label_size, 0, "Pre-compiled MAC label size"); 148 149static int mac_cache_fslabel_in_vnode = 1; 150SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW, 151 &mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode"); 152TUNABLE_INT("security.mac.cache_fslabel_in_vnode", 153 &mac_cache_fslabel_in_vnode); 154 155static int mac_vnode_label_cache_hits = 0; 156SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD, 157 &mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels"); 158static int mac_vnode_label_cache_misses = 0; 159SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD, 160 &mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels"); 161 162static int mac_mmap_revocation = 1; 163SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW, 164 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject " 165 "relabel"); 166static int mac_mmap_revocation_via_cow = 0; 167SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW, 168 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via " 169 "copy-on-write semantics, or by removing all write access"); 170 171#ifdef MAC_DEBUG 172SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0, 173 "TrustedBSD MAC debug info"); 174 175static int mac_debug_label_fallback = 0; 176SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW, 177 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label" 178 "when label is corrupted."); 179TUNABLE_INT("security.mac.debug_label_fallback", 180 &mac_debug_label_fallback); 181 182SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0, 183 "TrustedBSD MAC object counters"); 184 185static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs, 186 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents, 187 nmacipqs, nmacpipes; 188 189SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD, 190 &nmacmbufs, 0, "number of mbufs in use"); 191SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD, 192 &nmaccreds, 0, "number of ucreds in use"); 193SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD, 194 &nmacifnets, 0, "number of ifnets in use"); 195SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD, 196 &nmacipqs, 0, "number of ipqs in use"); 197SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD, 198 &nmacbpfdescs, 0, "number of bpfdescs in use"); 199SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD, 200 &nmacsockets, 0, "number of sockets in use"); 201SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD, 202 &nmacpipes, 0, "number of pipes in use"); 203SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD, 204 &nmacmounts, 0, "number of mounts in use"); 205SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD, 206 &nmactemp, 0, "number of temporary labels in use"); 207SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD, 208 &nmacvnodes, 0, "number of vnodes in use"); 209SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD, 210 &nmacdevfsdirents, 0, "number of devfs dirents inuse"); 211#endif 212 213static int error_select(int error1, int error2); 214static int mac_externalize(struct label *label, struct mac *mac); 215static int mac_policy_register(struct mac_policy_conf *mpc); 216static int mac_policy_unregister(struct mac_policy_conf *mpc); 217 218static int mac_stdcreatevnode_ea(struct vnode *vp); 219static void mac_check_vnode_mmap_downgrade(struct ucred *cred, 220 struct vnode *vp, int *prot); 221static void mac_cred_mmapped_drop_perms_recurse(struct thread *td, 222 struct ucred *cred, struct vm_map *map); 223 224static void mac_destroy_socket_label(struct label *label); 225 226MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector"); 227MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes"); 228 229/* 230 * mac_policy_list_lock protects the consistency of 'mac_policy_list', 231 * the linked list of attached policy modules. Read-only consumers of 232 * the list must acquire a shared lock for the duration of their use; 233 * writers must acquire an exclusive lock. Note that for compound 234 * operations, locks should be held for the entire compound operation, 235 * and that this is not yet done for relabel requests. 236 */ 237static struct mtx mac_policy_list_lock; 238static LIST_HEAD(, mac_policy_conf) mac_policy_list; 239static int mac_policy_list_busy; 240#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \ 241 "mac_policy_list_lock", NULL, MTX_DEF); 242#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock); 243#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock); 244 245#define MAC_POLICY_LIST_BUSY() do { \ 246 MAC_POLICY_LIST_LOCK(); \ 247 mac_policy_list_busy++; \ 248 MAC_POLICY_LIST_UNLOCK(); \ 249} while (0) 250 251#define MAC_POLICY_LIST_UNBUSY() do { \ 252 MAC_POLICY_LIST_LOCK(); \ 253 mac_policy_list_busy--; \ 254 if (mac_policy_list_busy < 0) \ 255 panic("Extra mac_policy_list_busy--"); \ 256 MAC_POLICY_LIST_UNLOCK(); \ 257} while (0) 258 259/* 260 * MAC_CHECK performs the designated check by walking the policy 261 * module list and checking with each as to how it feels about the 262 * request. Note that it returns its value via 'error' in the scope 263 * of the caller. 264 */ 265#define MAC_CHECK(check, args...) do { \ 266 struct mac_policy_conf *mpc; \ 267 \ 268 error = 0; \ 269 MAC_POLICY_LIST_BUSY(); \ 270 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 271 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 272 error = error_select( \ 273 mpc->mpc_ops->mpo_ ## check (args), \ 274 error); \ 275 } \ 276 MAC_POLICY_LIST_UNBUSY(); \ 277} while (0) 278 279/* 280 * MAC_BOOLEAN performs the designated boolean composition by walking 281 * the module list, invoking each instance of the operation, and 282 * combining the results using the passed C operator. Note that it 283 * returns its value via 'result' in the scope of the caller, which 284 * should be initialized by the caller in a meaningful way to get 285 * a meaningful result. 286 */ 287#define MAC_BOOLEAN(operation, composition, args...) do { \ 288 struct mac_policy_conf *mpc; \ 289 \ 290 MAC_POLICY_LIST_BUSY(); \ 291 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 292 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 293 result = result composition \ 294 mpc->mpc_ops->mpo_ ## operation (args); \ 295 } \ 296 MAC_POLICY_LIST_UNBUSY(); \ 297} while (0) 298 299/* 300 * MAC_PERFORM performs the designated operation by walking the policy 301 * module list and invoking that operation for each policy. 302 */ 303#define MAC_PERFORM(operation, args...) do { \ 304 struct mac_policy_conf *mpc; \ 305 \ 306 MAC_POLICY_LIST_BUSY(); \ 307 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 308 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 309 mpc->mpc_ops->mpo_ ## operation (args); \ 310 } \ 311 MAC_POLICY_LIST_UNBUSY(); \ 312} while (0) 313 314/* 315 * Initialize the MAC subsystem, including appropriate SMP locks. 316 */ 317static void 318mac_init(void) 319{ 320 321 LIST_INIT(&mac_policy_list); 322 MAC_POLICY_LIST_LOCKINIT(); 323} 324 325/* 326 * For the purposes of modules that want to know if they were loaded 327 * "early", set the mac_late flag once we've processed modules either 328 * linked into the kernel, or loaded before the kernel startup. 329 */ 330static void 331mac_late_init(void) 332{ 333 334 mac_late = 1; 335} 336 337/* 338 * Allow MAC policy modules to register during boot, etc. 339 */ 340int 341mac_policy_modevent(module_t mod, int type, void *data) 342{ 343 struct mac_policy_conf *mpc; 344 int error; 345 346 error = 0; 347 mpc = (struct mac_policy_conf *) data; 348 349 switch (type) { 350 case MOD_LOAD: 351 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE && 352 mac_late) { 353 printf("mac_policy_modevent: can't load %s policy " 354 "after booting\n", mpc->mpc_name); 355 error = EBUSY; 356 break; 357 } 358 error = mac_policy_register(mpc); 359 break; 360 case MOD_UNLOAD: 361 /* Don't unregister the module if it was never registered. */ 362 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) 363 != 0) 364 error = mac_policy_unregister(mpc); 365 else 366 error = 0; 367 break; 368 default: 369 break; 370 } 371 372 return (error); 373} 374 375static int 376mac_policy_register(struct mac_policy_conf *mpc) 377{ 378 struct mac_policy_conf *tmpc; 379 struct mac_policy_op_entry *mpe; 380 int slot; 381 382 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops), 383 M_MACOPVEC, M_WAITOK | M_ZERO); 384 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) { 385 switch (mpe->mpe_constant) { 386 case MAC_OP_LAST: 387 /* 388 * Doesn't actually happen, but this allows checking 389 * that all enumerated values are handled. 390 */ 391 break; 392 case MAC_DESTROY: 393 mpc->mpc_ops->mpo_destroy = 394 mpe->mpe_function; 395 break; 396 case MAC_INIT: 397 mpc->mpc_ops->mpo_init = 398 mpe->mpe_function; 399 break; 400 case MAC_SYSCALL: 401 mpc->mpc_ops->mpo_syscall = 402 mpe->mpe_function; 403 break; 404 case MAC_INIT_BPFDESC_LABEL: 405 mpc->mpc_ops->mpo_init_bpfdesc_label = 406 mpe->mpe_function; 407 break; 408 case MAC_INIT_CRED_LABEL: 409 mpc->mpc_ops->mpo_init_cred_label = 410 mpe->mpe_function; 411 break; 412 case MAC_INIT_DEVFSDIRENT_LABEL: 413 mpc->mpc_ops->mpo_init_devfsdirent_label = 414 mpe->mpe_function; 415 break; 416 case MAC_INIT_IFNET_LABEL: 417 mpc->mpc_ops->mpo_init_ifnet_label = 418 mpe->mpe_function; 419 break; 420 case MAC_INIT_IPQ_LABEL: 421 mpc->mpc_ops->mpo_init_ipq_label = 422 mpe->mpe_function; 423 break; 424 case MAC_INIT_MBUF_LABEL: 425 mpc->mpc_ops->mpo_init_mbuf_label = 426 mpe->mpe_function; 427 break; 428 case MAC_INIT_MOUNT_LABEL: 429 mpc->mpc_ops->mpo_init_mount_label = 430 mpe->mpe_function; 431 break; 432 case MAC_INIT_MOUNT_FS_LABEL: 433 mpc->mpc_ops->mpo_init_mount_fs_label = 434 mpe->mpe_function; 435 break; 436 case MAC_INIT_PIPE_LABEL: 437 mpc->mpc_ops->mpo_init_pipe_label = 438 mpe->mpe_function; 439 break; 440 case MAC_INIT_SOCKET_LABEL: 441 mpc->mpc_ops->mpo_init_socket_label = 442 mpe->mpe_function; 443 break; 444 case MAC_INIT_SOCKET_PEER_LABEL: 445 mpc->mpc_ops->mpo_init_socket_peer_label = 446 mpe->mpe_function; 447 break; 448 case MAC_INIT_TEMP_LABEL: 449 mpc->mpc_ops->mpo_init_temp_label = 450 mpe->mpe_function; 451 break; 452 case MAC_INIT_VNODE_LABEL: 453 mpc->mpc_ops->mpo_init_vnode_label = 454 mpe->mpe_function; 455 break; 456 case MAC_DESTROY_BPFDESC_LABEL: 457 mpc->mpc_ops->mpo_destroy_bpfdesc_label = 458 mpe->mpe_function; 459 break; 460 case MAC_DESTROY_CRED_LABEL: 461 mpc->mpc_ops->mpo_destroy_cred_label = 462 mpe->mpe_function; 463 break; 464 case MAC_DESTROY_DEVFSDIRENT_LABEL: 465 mpc->mpc_ops->mpo_destroy_devfsdirent_label = 466 mpe->mpe_function; 467 break; 468 case MAC_DESTROY_IFNET_LABEL: 469 mpc->mpc_ops->mpo_destroy_ifnet_label = 470 mpe->mpe_function; 471 break; 472 case MAC_DESTROY_IPQ_LABEL: 473 mpc->mpc_ops->mpo_destroy_ipq_label = 474 mpe->mpe_function; 475 break; 476 case MAC_DESTROY_MBUF_LABEL: 477 mpc->mpc_ops->mpo_destroy_mbuf_label = 478 mpe->mpe_function; 479 break; 480 case MAC_DESTROY_MOUNT_LABEL: 481 mpc->mpc_ops->mpo_destroy_mount_label = 482 mpe->mpe_function; 483 break; 484 case MAC_DESTROY_MOUNT_FS_LABEL: 485 mpc->mpc_ops->mpo_destroy_mount_fs_label = 486 mpe->mpe_function; 487 break; 488 case MAC_DESTROY_PIPE_LABEL: 489 mpc->mpc_ops->mpo_destroy_pipe_label = 490 mpe->mpe_function; 491 break; 492 case MAC_DESTROY_SOCKET_LABEL: 493 mpc->mpc_ops->mpo_destroy_socket_label = 494 mpe->mpe_function; 495 break; 496 case MAC_DESTROY_SOCKET_PEER_LABEL: 497 mpc->mpc_ops->mpo_destroy_socket_peer_label = 498 mpe->mpe_function; 499 break; 500 case MAC_DESTROY_TEMP_LABEL: 501 mpc->mpc_ops->mpo_destroy_temp_label = 502 mpe->mpe_function; 503 break; 504 case MAC_DESTROY_VNODE_LABEL: 505 mpc->mpc_ops->mpo_destroy_vnode_label = 506 mpe->mpe_function; 507 break; 508 case MAC_EXTERNALIZE: 509 mpc->mpc_ops->mpo_externalize = 510 mpe->mpe_function; 511 break; 512 case MAC_INTERNALIZE: 513 mpc->mpc_ops->mpo_internalize = 514 mpe->mpe_function; 515 break; 516 case MAC_CREATE_DEVFS_DEVICE: 517 mpc->mpc_ops->mpo_create_devfs_device = 518 mpe->mpe_function; 519 break; 520 case MAC_CREATE_DEVFS_DIRECTORY: 521 mpc->mpc_ops->mpo_create_devfs_directory = 522 mpe->mpe_function; 523 break; 524 case MAC_CREATE_DEVFS_SYMLINK: 525 mpc->mpc_ops->mpo_create_devfs_symlink = 526 mpe->mpe_function; 527 break; 528 case MAC_CREATE_DEVFS_VNODE: 529 mpc->mpc_ops->mpo_create_devfs_vnode = 530 mpe->mpe_function; 531 break; 532 case MAC_STDCREATEVNODE_EA: 533 mpc->mpc_ops->mpo_stdcreatevnode_ea = 534 mpe->mpe_function; 535 break; 536 case MAC_CREATE_VNODE: 537 mpc->mpc_ops->mpo_create_vnode = 538 mpe->mpe_function; 539 break; 540 case MAC_CREATE_MOUNT: 541 mpc->mpc_ops->mpo_create_mount = 542 mpe->mpe_function; 543 break; 544 case MAC_CREATE_ROOT_MOUNT: 545 mpc->mpc_ops->mpo_create_root_mount = 546 mpe->mpe_function; 547 break; 548 case MAC_RELABEL_VNODE: 549 mpc->mpc_ops->mpo_relabel_vnode = 550 mpe->mpe_function; 551 break; 552 case MAC_UPDATE_DEVFSDIRENT: 553 mpc->mpc_ops->mpo_update_devfsdirent = 554 mpe->mpe_function; 555 break; 556 case MAC_UPDATE_PROCFSVNODE: 557 mpc->mpc_ops->mpo_update_procfsvnode = 558 mpe->mpe_function; 559 break; 560 case MAC_UPDATE_VNODE_FROM_EXTATTR: 561 mpc->mpc_ops->mpo_update_vnode_from_extattr = 562 mpe->mpe_function; 563 break; 564 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED: 565 mpc->mpc_ops->mpo_update_vnode_from_externalized = 566 mpe->mpe_function; 567 break; 568 case MAC_UPDATE_VNODE_FROM_MOUNT: 569 mpc->mpc_ops->mpo_update_vnode_from_mount = 570 mpe->mpe_function; 571 break; 572 case MAC_CREATE_MBUF_FROM_SOCKET: 573 mpc->mpc_ops->mpo_create_mbuf_from_socket = 574 mpe->mpe_function; 575 break; 576 case MAC_CREATE_PIPE: 577 mpc->mpc_ops->mpo_create_pipe = 578 mpe->mpe_function; 579 break; 580 case MAC_CREATE_SOCKET: 581 mpc->mpc_ops->mpo_create_socket = 582 mpe->mpe_function; 583 break; 584 case MAC_CREATE_SOCKET_FROM_SOCKET: 585 mpc->mpc_ops->mpo_create_socket_from_socket = 586 mpe->mpe_function; 587 break; 588 case MAC_RELABEL_PIPE: 589 mpc->mpc_ops->mpo_relabel_pipe = 590 mpe->mpe_function; 591 break; 592 case MAC_RELABEL_SOCKET: 593 mpc->mpc_ops->mpo_relabel_socket = 594 mpe->mpe_function; 595 break; 596 case MAC_SET_SOCKET_PEER_FROM_MBUF: 597 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf = 598 mpe->mpe_function; 599 break; 600 case MAC_SET_SOCKET_PEER_FROM_SOCKET: 601 mpc->mpc_ops->mpo_set_socket_peer_from_socket = 602 mpe->mpe_function; 603 break; 604 case MAC_CREATE_BPFDESC: 605 mpc->mpc_ops->mpo_create_bpfdesc = 606 mpe->mpe_function; 607 break; 608 case MAC_CREATE_DATAGRAM_FROM_IPQ: 609 mpc->mpc_ops->mpo_create_datagram_from_ipq = 610 mpe->mpe_function; 611 break; 612 case MAC_CREATE_FRAGMENT: 613 mpc->mpc_ops->mpo_create_fragment = 614 mpe->mpe_function; 615 break; 616 case MAC_CREATE_IFNET: 617 mpc->mpc_ops->mpo_create_ifnet = 618 mpe->mpe_function; 619 break; 620 case MAC_CREATE_IPQ: 621 mpc->mpc_ops->mpo_create_ipq = 622 mpe->mpe_function; 623 break; 624 case MAC_CREATE_MBUF_FROM_MBUF: 625 mpc->mpc_ops->mpo_create_mbuf_from_mbuf = 626 mpe->mpe_function; 627 break; 628 case MAC_CREATE_MBUF_LINKLAYER: 629 mpc->mpc_ops->mpo_create_mbuf_linklayer = 630 mpe->mpe_function; 631 break; 632 case MAC_CREATE_MBUF_FROM_BPFDESC: 633 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc = 634 mpe->mpe_function; 635 break; 636 case MAC_CREATE_MBUF_FROM_IFNET: 637 mpc->mpc_ops->mpo_create_mbuf_from_ifnet = 638 mpe->mpe_function; 639 break; 640 case MAC_CREATE_MBUF_MULTICAST_ENCAP: 641 mpc->mpc_ops->mpo_create_mbuf_multicast_encap = 642 mpe->mpe_function; 643 break; 644 case MAC_CREATE_MBUF_NETLAYER: 645 mpc->mpc_ops->mpo_create_mbuf_netlayer = 646 mpe->mpe_function; 647 break; 648 case MAC_FRAGMENT_MATCH: 649 mpc->mpc_ops->mpo_fragment_match = 650 mpe->mpe_function; 651 break; 652 case MAC_RELABEL_IFNET: 653 mpc->mpc_ops->mpo_relabel_ifnet = 654 mpe->mpe_function; 655 break; 656 case MAC_UPDATE_IPQ: 657 mpc->mpc_ops->mpo_update_ipq = 658 mpe->mpe_function; 659 break; 660 case MAC_CREATE_CRED: 661 mpc->mpc_ops->mpo_create_cred = 662 mpe->mpe_function; 663 break; 664 case MAC_EXECVE_TRANSITION: 665 mpc->mpc_ops->mpo_execve_transition = 666 mpe->mpe_function; 667 break; 668 case MAC_EXECVE_WILL_TRANSITION: 669 mpc->mpc_ops->mpo_execve_will_transition = 670 mpe->mpe_function; 671 break; 672 case MAC_CREATE_PROC0: 673 mpc->mpc_ops->mpo_create_proc0 = 674 mpe->mpe_function; 675 break; 676 case MAC_CREATE_PROC1: 677 mpc->mpc_ops->mpo_create_proc1 = 678 mpe->mpe_function; 679 break; 680 case MAC_RELABEL_CRED: 681 mpc->mpc_ops->mpo_relabel_cred = 682 mpe->mpe_function; 683 break; 684 case MAC_THREAD_USERRET: 685 mpc->mpc_ops->mpo_thread_userret = 686 mpe->mpe_function; 687 break; 688 case MAC_CHECK_BPFDESC_RECEIVE: 689 mpc->mpc_ops->mpo_check_bpfdesc_receive = 690 mpe->mpe_function; 691 break; 692 case MAC_CHECK_CRED_RELABEL: 693 mpc->mpc_ops->mpo_check_cred_relabel = 694 mpe->mpe_function; 695 break; 696 case MAC_CHECK_CRED_VISIBLE: 697 mpc->mpc_ops->mpo_check_cred_visible = 698 mpe->mpe_function; 699 break; 700 case MAC_CHECK_IFNET_RELABEL: 701 mpc->mpc_ops->mpo_check_ifnet_relabel = 702 mpe->mpe_function; 703 break; 704 case MAC_CHECK_IFNET_TRANSMIT: 705 mpc->mpc_ops->mpo_check_ifnet_transmit = 706 mpe->mpe_function; 707 break; 708 case MAC_CHECK_MOUNT_STAT: 709 mpc->mpc_ops->mpo_check_mount_stat = 710 mpe->mpe_function; 711 break; 712 case MAC_CHECK_PIPE_IOCTL: 713 mpc->mpc_ops->mpo_check_pipe_ioctl = 714 mpe->mpe_function; 715 break; 716 case MAC_CHECK_PIPE_POLL: 717 mpc->mpc_ops->mpo_check_pipe_poll = 718 mpe->mpe_function; 719 break; 720 case MAC_CHECK_PIPE_READ: 721 mpc->mpc_ops->mpo_check_pipe_read = 722 mpe->mpe_function; 723 break; 724 case MAC_CHECK_PIPE_RELABEL: 725 mpc->mpc_ops->mpo_check_pipe_relabel = 726 mpe->mpe_function; 727 break; 728 case MAC_CHECK_PIPE_STAT: 729 mpc->mpc_ops->mpo_check_pipe_stat = 730 mpe->mpe_function; 731 break; 732 case MAC_CHECK_PIPE_WRITE: 733 mpc->mpc_ops->mpo_check_pipe_write = 734 mpe->mpe_function; 735 break; 736 case MAC_CHECK_PROC_DEBUG: 737 mpc->mpc_ops->mpo_check_proc_debug = 738 mpe->mpe_function; 739 break; 740 case MAC_CHECK_PROC_SCHED: 741 mpc->mpc_ops->mpo_check_proc_sched = 742 mpe->mpe_function; 743 break; 744 case MAC_CHECK_PROC_SIGNAL: 745 mpc->mpc_ops->mpo_check_proc_signal = 746 mpe->mpe_function; 747 break; 748 case MAC_CHECK_SOCKET_BIND: 749 mpc->mpc_ops->mpo_check_socket_bind = 750 mpe->mpe_function; 751 break; 752 case MAC_CHECK_SOCKET_CONNECT: 753 mpc->mpc_ops->mpo_check_socket_connect = 754 mpe->mpe_function; 755 break; 756 case MAC_CHECK_SOCKET_DELIVER: 757 mpc->mpc_ops->mpo_check_socket_deliver = 758 mpe->mpe_function; 759 break; 760 case MAC_CHECK_SOCKET_LISTEN: 761 mpc->mpc_ops->mpo_check_socket_listen = 762 mpe->mpe_function; 763 break; 764 case MAC_CHECK_SOCKET_RECEIVE: 765 mpc->mpc_ops->mpo_check_socket_receive = 766 mpe->mpe_function; 767 break; 768 case MAC_CHECK_SOCKET_RELABEL: 769 mpc->mpc_ops->mpo_check_socket_relabel = 770 mpe->mpe_function; 771 break; 772 case MAC_CHECK_SOCKET_SEND: 773 mpc->mpc_ops->mpo_check_socket_send = 774 mpe->mpe_function; 775 break; 776 case MAC_CHECK_SOCKET_VISIBLE: 777 mpc->mpc_ops->mpo_check_socket_visible = 778 mpe->mpe_function; 779 break; 780 case MAC_CHECK_VNODE_ACCESS: 781 mpc->mpc_ops->mpo_check_vnode_access = 782 mpe->mpe_function; 783 break; 784 case MAC_CHECK_VNODE_CHDIR: 785 mpc->mpc_ops->mpo_check_vnode_chdir = 786 mpe->mpe_function; 787 break; 788 case MAC_CHECK_VNODE_CHROOT: 789 mpc->mpc_ops->mpo_check_vnode_chroot = 790 mpe->mpe_function; 791 break; 792 case MAC_CHECK_VNODE_CREATE: 793 mpc->mpc_ops->mpo_check_vnode_create = 794 mpe->mpe_function; 795 break; 796 case MAC_CHECK_VNODE_DELETE: 797 mpc->mpc_ops->mpo_check_vnode_delete = 798 mpe->mpe_function; 799 break; 800 case MAC_CHECK_VNODE_DELETEACL: 801 mpc->mpc_ops->mpo_check_vnode_deleteacl = 802 mpe->mpe_function; 803 break; 804 case MAC_CHECK_VNODE_EXEC: 805 mpc->mpc_ops->mpo_check_vnode_exec = 806 mpe->mpe_function; 807 break; 808 case MAC_CHECK_VNODE_GETACL: 809 mpc->mpc_ops->mpo_check_vnode_getacl = 810 mpe->mpe_function; 811 break; 812 case MAC_CHECK_VNODE_GETEXTATTR: 813 mpc->mpc_ops->mpo_check_vnode_getextattr = 814 mpe->mpe_function; 815 break; 816 case MAC_CHECK_VNODE_LINK: 817 mpc->mpc_ops->mpo_check_vnode_link = 818 mpe->mpe_function; 819 break; 820 case MAC_CHECK_VNODE_LOOKUP: 821 mpc->mpc_ops->mpo_check_vnode_lookup = 822 mpe->mpe_function; 823 break; 824 case MAC_CHECK_VNODE_MMAP: 825 mpc->mpc_ops->mpo_check_vnode_mmap = 826 mpe->mpe_function; 827 break; 828 case MAC_CHECK_VNODE_MMAP_DOWNGRADE: 829 mpc->mpc_ops->mpo_check_vnode_mmap_downgrade = 830 mpe->mpe_function; 831 break; 832 case MAC_CHECK_VNODE_MPROTECT: 833 mpc->mpc_ops->mpo_check_vnode_mprotect = 834 mpe->mpe_function; 835 break; 836 case MAC_CHECK_VNODE_OPEN: 837 mpc->mpc_ops->mpo_check_vnode_open = 838 mpe->mpe_function; 839 break; 840 case MAC_CHECK_VNODE_POLL: 841 mpc->mpc_ops->mpo_check_vnode_poll = 842 mpe->mpe_function; 843 break; 844 case MAC_CHECK_VNODE_READ: 845 mpc->mpc_ops->mpo_check_vnode_read = 846 mpe->mpe_function; 847 break; 848 case MAC_CHECK_VNODE_READDIR: 849 mpc->mpc_ops->mpo_check_vnode_readdir = 850 mpe->mpe_function; 851 break; 852 case MAC_CHECK_VNODE_READLINK: 853 mpc->mpc_ops->mpo_check_vnode_readlink = 854 mpe->mpe_function; 855 break; 856 case MAC_CHECK_VNODE_RELABEL: 857 mpc->mpc_ops->mpo_check_vnode_relabel = 858 mpe->mpe_function; 859 break; 860 case MAC_CHECK_VNODE_RENAME_FROM: 861 mpc->mpc_ops->mpo_check_vnode_rename_from = 862 mpe->mpe_function; 863 break; 864 case MAC_CHECK_VNODE_RENAME_TO: 865 mpc->mpc_ops->mpo_check_vnode_rename_to = 866 mpe->mpe_function; 867 break; 868 case MAC_CHECK_VNODE_REVOKE: 869 mpc->mpc_ops->mpo_check_vnode_revoke = 870 mpe->mpe_function; 871 break; 872 case MAC_CHECK_VNODE_SETACL: 873 mpc->mpc_ops->mpo_check_vnode_setacl = 874 mpe->mpe_function; 875 break; 876 case MAC_CHECK_VNODE_SETEXTATTR: 877 mpc->mpc_ops->mpo_check_vnode_setextattr = 878 mpe->mpe_function; 879 break; 880 case MAC_CHECK_VNODE_SETFLAGS: 881 mpc->mpc_ops->mpo_check_vnode_setflags = 882 mpe->mpe_function; 883 break; 884 case MAC_CHECK_VNODE_SETMODE: 885 mpc->mpc_ops->mpo_check_vnode_setmode = 886 mpe->mpe_function; 887 break; 888 case MAC_CHECK_VNODE_SETOWNER: 889 mpc->mpc_ops->mpo_check_vnode_setowner = 890 mpe->mpe_function; 891 break; 892 case MAC_CHECK_VNODE_SETUTIMES: 893 mpc->mpc_ops->mpo_check_vnode_setutimes = 894 mpe->mpe_function; 895 break; 896 case MAC_CHECK_VNODE_STAT: 897 mpc->mpc_ops->mpo_check_vnode_stat = 898 mpe->mpe_function; 899 break; 900 case MAC_CHECK_VNODE_WRITE: 901 mpc->mpc_ops->mpo_check_vnode_write = 902 mpe->mpe_function; 903 break; 904/* 905 default: 906 printf("MAC policy `%s': unknown operation %d\n", 907 mpc->mpc_name, mpe->mpe_constant); 908 return (EINVAL); 909*/ 910 } 911 } 912 MAC_POLICY_LIST_LOCK(); 913 if (mac_policy_list_busy > 0) { 914 MAC_POLICY_LIST_UNLOCK(); 915 FREE(mpc->mpc_ops, M_MACOPVEC); 916 mpc->mpc_ops = NULL; 917 return (EBUSY); 918 } 919 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { 920 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { 921 MAC_POLICY_LIST_UNLOCK(); 922 FREE(mpc->mpc_ops, M_MACOPVEC); 923 mpc->mpc_ops = NULL; 924 return (EEXIST); 925 } 926 } 927 if (mpc->mpc_field_off != NULL) { 928 slot = ffs(mac_policy_offsets_free); 929 if (slot == 0) { 930 MAC_POLICY_LIST_UNLOCK(); 931 FREE(mpc->mpc_ops, M_MACOPVEC); 932 mpc->mpc_ops = NULL; 933 return (ENOMEM); 934 } 935 slot--; 936 mac_policy_offsets_free &= ~(1 << slot); 937 *mpc->mpc_field_off = slot; 938 } 939 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED; 940 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list); 941 942 /* Per-policy initialization. */ 943 if (mpc->mpc_ops->mpo_init != NULL) 944 (*(mpc->mpc_ops->mpo_init))(mpc); 945 MAC_POLICY_LIST_UNLOCK(); 946 947 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname, 948 mpc->mpc_name); 949 950 return (0); 951} 952 953static int 954mac_policy_unregister(struct mac_policy_conf *mpc) 955{ 956 957 /* 958 * If we fail the load, we may get a request to unload. Check 959 * to see if we did the run-time registration, and if not, 960 * silently succeed. 961 */ 962 MAC_POLICY_LIST_LOCK(); 963 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) { 964 MAC_POLICY_LIST_UNLOCK(); 965 return (0); 966 } 967#if 0 968 /* 969 * Don't allow unloading modules with private data. 970 */ 971 if (mpc->mpc_field_off != NULL) { 972 MAC_POLICY_LIST_UNLOCK(); 973 return (EBUSY); 974 } 975#endif 976 /* 977 * Only allow the unload to proceed if the module is unloadable 978 * by its own definition. 979 */ 980 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) { 981 MAC_POLICY_LIST_UNLOCK(); 982 return (EBUSY); 983 } 984 /* 985 * Right now, we EBUSY if the list is in use. In the future, 986 * for reliability reasons, we might want to sleep and wakeup 987 * later to try again. 988 */ 989 if (mac_policy_list_busy > 0) { 990 MAC_POLICY_LIST_UNLOCK(); 991 return (EBUSY); 992 } 993 if (mpc->mpc_ops->mpo_destroy != NULL) 994 (*(mpc->mpc_ops->mpo_destroy))(mpc); 995 996 LIST_REMOVE(mpc, mpc_list); 997 MAC_POLICY_LIST_UNLOCK(); 998 999 FREE(mpc->mpc_ops, M_MACOPVEC); 1000 mpc->mpc_ops = NULL; 1001 mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED; 1002 1003 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname, 1004 mpc->mpc_name); 1005 1006 return (0); 1007} 1008 1009/* 1010 * Define an error value precedence, and given two arguments, selects the 1011 * value with the higher precedence. 1012 */ 1013static int 1014error_select(int error1, int error2) 1015{ 1016 1017 /* Certain decision-making errors take top priority. */ 1018 if (error1 == EDEADLK || error2 == EDEADLK) 1019 return (EDEADLK); 1020 1021 /* Invalid arguments should be reported where possible. */ 1022 if (error1 == EINVAL || error2 == EINVAL) 1023 return (EINVAL); 1024 1025 /* Precedence goes to "visibility", with both process and file. */ 1026 if (error1 == ESRCH || error2 == ESRCH) 1027 return (ESRCH); 1028 1029 if (error1 == ENOENT || error2 == ENOENT) 1030 return (ENOENT); 1031 1032 /* Precedence goes to DAC/MAC protections. */ 1033 if (error1 == EACCES || error2 == EACCES) 1034 return (EACCES); 1035 1036 /* Precedence goes to privilege. */ 1037 if (error1 == EPERM || error2 == EPERM) 1038 return (EPERM); 1039 1040 /* Precedence goes to error over success; otherwise, arbitrary. */ 1041 if (error1 != 0) 1042 return (error1); 1043 return (error2); 1044} 1045 1046static void 1047mac_init_label(struct label *label) 1048{ 1049 1050 bzero(label, sizeof(*label)); 1051 label->l_flags = MAC_FLAG_INITIALIZED; 1052} 1053 1054static void 1055mac_destroy_label(struct label *label) 1056{ 1057 1058 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED, 1059 ("destroying uninitialized label")); 1060 1061 bzero(label, sizeof(*label)); 1062 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */ 1063} 1064 1065static void 1066mac_init_structmac(struct mac *mac) 1067{ 1068 1069 bzero(mac, sizeof(*mac)); 1070 mac->m_macflags = MAC_FLAG_INITIALIZED; 1071} 1072 1073void 1074mac_init_bpfdesc(struct bpf_d *bpf_d) 1075{ 1076 1077 mac_init_label(&bpf_d->bd_label); 1078 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label); 1079#ifdef MAC_DEBUG 1080 atomic_add_int(&nmacbpfdescs, 1); 1081#endif 1082} 1083 1084void 1085mac_init_cred(struct ucred *cr) 1086{ 1087 1088 mac_init_label(&cr->cr_label); 1089 MAC_PERFORM(init_cred_label, &cr->cr_label); 1090#ifdef MAC_DEBUG 1091 atomic_add_int(&nmaccreds, 1); 1092#endif 1093} 1094 1095void 1096mac_init_devfsdirent(struct devfs_dirent *de) 1097{ 1098 1099 mac_init_label(&de->de_label); 1100 MAC_PERFORM(init_devfsdirent_label, &de->de_label); 1101#ifdef MAC_DEBUG 1102 atomic_add_int(&nmacdevfsdirents, 1); 1103#endif 1104} 1105 1106void 1107mac_init_ifnet(struct ifnet *ifp) 1108{ 1109 1110 mac_init_label(&ifp->if_label); 1111 MAC_PERFORM(init_ifnet_label, &ifp->if_label); 1112#ifdef MAC_DEBUG 1113 atomic_add_int(&nmacifnets, 1); 1114#endif 1115} 1116 1117void 1118mac_init_ipq(struct ipq *ipq) 1119{ 1120 1121 mac_init_label(&ipq->ipq_label); 1122 MAC_PERFORM(init_ipq_label, &ipq->ipq_label); 1123#ifdef MAC_DEBUG 1124 atomic_add_int(&nmacipqs, 1); 1125#endif 1126} 1127 1128int 1129mac_init_mbuf(struct mbuf *m, int flag) 1130{ 1131 int error; 1132 1133 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf")); 1134 1135 mac_init_label(&m->m_pkthdr.label); 1136 1137 MAC_CHECK(init_mbuf_label, &m->m_pkthdr.label, flag); 1138 if (error) { 1139 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label); 1140 mac_destroy_label(&m->m_pkthdr.label); 1141 } 1142 1143#ifdef MAC_DEBUG 1144 if (error == 0) 1145 atomic_add_int(&nmacmbufs, 1); 1146#endif 1147 return (error); 1148} 1149 1150void 1151mac_init_mount(struct mount *mp) 1152{ 1153 1154 mac_init_label(&mp->mnt_mntlabel); 1155 mac_init_label(&mp->mnt_fslabel); 1156 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel); 1157 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel); 1158#ifdef MAC_DEBUG 1159 atomic_add_int(&nmacmounts, 1); 1160#endif 1161} 1162 1163void 1164mac_init_pipe(struct pipe *pipe) 1165{ 1166 struct label *label; 1167 1168 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK); 1169 mac_init_label(label); 1170 pipe->pipe_label = label; 1171 pipe->pipe_peer->pipe_label = label; 1172 MAC_PERFORM(init_pipe_label, pipe->pipe_label); 1173#ifdef MAC_DEBUG 1174 atomic_add_int(&nmacpipes, 1); 1175#endif 1176} 1177 1178static int 1179mac_init_socket_label(struct label *label, int flag) 1180{ 1181 int error; 1182 1183 mac_init_label(label); 1184 1185 MAC_CHECK(init_socket_label, label, flag); 1186 if (error) { 1187 MAC_PERFORM(destroy_socket_label, label); 1188 mac_destroy_label(label); 1189 } 1190 1191#ifdef MAC_DEBUG 1192 if (error == 0) 1193 atomic_add_int(&nmacsockets, 1); 1194#endif 1195 1196 return (error); 1197} 1198 1199static int 1200mac_init_socket_peer_label(struct label *label, int flag) 1201{ 1202 int error; 1203 1204 mac_init_label(label); 1205 1206 MAC_CHECK(init_socket_peer_label, label, flag); 1207 if (error) { 1208 MAC_PERFORM(destroy_socket_label, label); 1209 mac_destroy_label(label); 1210 } 1211 1212 return (error); 1213} 1214 1215int 1216mac_init_socket(struct socket *socket, int flag) 1217{ 1218 int error; 1219 1220 error = mac_init_socket_label(&socket->so_label, flag); 1221 if (error) 1222 return (error); 1223 1224 error = mac_init_socket_peer_label(&socket->so_peerlabel, flag); 1225 if (error) 1226 mac_destroy_socket_label(&socket->so_label); 1227 1228 return (error); 1229} 1230 1231static void 1232mac_init_temp(struct label *label) 1233{ 1234 1235 mac_init_label(label); 1236 MAC_PERFORM(init_temp_label, label); 1237#ifdef MAC_DEBUG 1238 atomic_add_int(&nmactemp, 1); 1239#endif 1240} 1241 1242void 1243mac_init_vnode(struct vnode *vp) 1244{ 1245 1246 mac_init_label(&vp->v_label); 1247 MAC_PERFORM(init_vnode_label, &vp->v_label); 1248#ifdef MAC_DEBUG 1249 atomic_add_int(&nmacvnodes, 1); 1250#endif 1251} 1252 1253void 1254mac_destroy_bpfdesc(struct bpf_d *bpf_d) 1255{ 1256 1257 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label); 1258 mac_destroy_label(&bpf_d->bd_label); 1259#ifdef MAC_DEBUG 1260 atomic_subtract_int(&nmacbpfdescs, 1); 1261#endif 1262} 1263 1264void 1265mac_destroy_cred(struct ucred *cr) 1266{ 1267 1268 MAC_PERFORM(destroy_cred_label, &cr->cr_label); 1269 mac_destroy_label(&cr->cr_label); 1270#ifdef MAC_DEBUG 1271 atomic_subtract_int(&nmaccreds, 1); 1272#endif 1273} 1274 1275void 1276mac_destroy_devfsdirent(struct devfs_dirent *de) 1277{ 1278 1279 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label); 1280 mac_destroy_label(&de->de_label); 1281#ifdef MAC_DEBUG 1282 atomic_subtract_int(&nmacdevfsdirents, 1); 1283#endif 1284} 1285 1286void 1287mac_destroy_ifnet(struct ifnet *ifp) 1288{ 1289 1290 MAC_PERFORM(destroy_ifnet_label, &ifp->if_label); 1291 mac_destroy_label(&ifp->if_label); 1292#ifdef MAC_DEBUG 1293 atomic_subtract_int(&nmacifnets, 1); 1294#endif 1295} 1296 1297void 1298mac_destroy_ipq(struct ipq *ipq) 1299{ 1300 1301 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label); 1302 mac_destroy_label(&ipq->ipq_label); 1303#ifdef MAC_DEBUG 1304 atomic_subtract_int(&nmacipqs, 1); 1305#endif 1306} 1307 1308void 1309mac_destroy_mbuf(struct mbuf *m) 1310{ 1311 1312 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label); 1313 mac_destroy_label(&m->m_pkthdr.label); 1314#ifdef MAC_DEBUG 1315 atomic_subtract_int(&nmacmbufs, 1); 1316#endif 1317} 1318 1319void 1320mac_destroy_mount(struct mount *mp) 1321{ 1322 1323 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel); 1324 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel); 1325 mac_destroy_label(&mp->mnt_fslabel); 1326 mac_destroy_label(&mp->mnt_mntlabel); 1327#ifdef MAC_DEBUG 1328 atomic_subtract_int(&nmacmounts, 1); 1329#endif 1330} 1331 1332void 1333mac_destroy_pipe(struct pipe *pipe) 1334{ 1335 1336 MAC_PERFORM(destroy_pipe_label, pipe->pipe_label); 1337 mac_destroy_label(pipe->pipe_label); 1338 free(pipe->pipe_label, M_MACPIPELABEL); 1339#ifdef MAC_DEBUG 1340 atomic_subtract_int(&nmacpipes, 1); 1341#endif 1342} 1343 1344static void 1345mac_destroy_socket_label(struct label *label) 1346{ 1347 1348 MAC_PERFORM(destroy_socket_label, label); 1349 mac_destroy_label(label); 1350#ifdef MAC_DEBUG 1351 atomic_subtract_int(&nmacsockets, 1); 1352#endif 1353} 1354 1355static void 1356mac_destroy_socket_peer_label(struct label *label) 1357{ 1358 1359 MAC_PERFORM(destroy_socket_peer_label, label); 1360 mac_destroy_label(label); 1361} 1362 1363void 1364mac_destroy_socket(struct socket *socket) 1365{ 1366 1367 mac_destroy_socket_label(&socket->so_label); 1368 mac_destroy_socket_peer_label(&socket->so_peerlabel); 1369} 1370 1371static void 1372mac_destroy_temp(struct label *label) 1373{ 1374 1375 MAC_PERFORM(destroy_temp_label, label); 1376 mac_destroy_label(label); 1377#ifdef MAC_DEBUG 1378 atomic_subtract_int(&nmactemp, 1); 1379#endif 1380} 1381 1382void 1383mac_destroy_vnode(struct vnode *vp) 1384{ 1385 1386 MAC_PERFORM(destroy_vnode_label, &vp->v_label); 1387 mac_destroy_label(&vp->v_label); 1388#ifdef MAC_DEBUG 1389 atomic_subtract_int(&nmacvnodes, 1); 1390#endif 1391} 1392 1393static int 1394mac_externalize(struct label *label, struct mac *mac) 1395{ 1396 int error; 1397 1398 mac_init_structmac(mac); 1399 MAC_CHECK(externalize, label, mac); 1400 1401 return (error); 1402} 1403 1404static int 1405mac_internalize(struct label *label, struct mac *mac) 1406{ 1407 int error; 1408 1409 mac_init_temp(label); 1410 MAC_CHECK(internalize, label, mac); 1411 if (error) 1412 mac_destroy_temp(label); 1413 1414 return (error); 1415} 1416 1417/* 1418 * Initialize MAC label for the first kernel process, from which other 1419 * kernel processes and threads are spawned. 1420 */ 1421void 1422mac_create_proc0(struct ucred *cred) 1423{ 1424 1425 MAC_PERFORM(create_proc0, cred); 1426} 1427 1428/* 1429 * Initialize MAC label for the first userland process, from which other 1430 * userland processes and threads are spawned. 1431 */ 1432void 1433mac_create_proc1(struct ucred *cred) 1434{ 1435 1436 MAC_PERFORM(create_proc1, cred); 1437} 1438 1439void 1440mac_thread_userret(struct thread *td) 1441{ 1442 1443 MAC_PERFORM(thread_userret, td); 1444} 1445 1446/* 1447 * When a new process is created, its label must be initialized. Generally, 1448 * this involves inheritence from the parent process, modulo possible 1449 * deltas. This function allows that processing to take place. 1450 */ 1451void 1452mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred) 1453{ 1454 1455 MAC_PERFORM(create_cred, parent_cred, child_cred); 1456} 1457 1458void 1459mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp) 1460{ 1461 1462 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label); 1463} 1464 1465void 1466mac_update_procfsvnode(struct vnode *vp, struct ucred *cred) 1467{ 1468 1469 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred); 1470} 1471 1472/* 1473 * Support callout for policies that manage their own externalization 1474 * using extended attributes. 1475 */ 1476static int 1477mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp) 1478{ 1479 int error; 1480 1481 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp, 1482 &mp->mnt_fslabel); 1483 1484 return (error); 1485} 1486 1487/* 1488 * Given an externalized mac label, internalize it and stamp it on a 1489 * vnode. 1490 */ 1491static int 1492mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac) 1493{ 1494 int error; 1495 1496 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac); 1497 1498 return (error); 1499} 1500 1501/* 1502 * Call out to individual policies to update the label in a vnode from 1503 * the mountpoint. 1504 */ 1505void 1506mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp) 1507{ 1508 1509 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp, 1510 &mp->mnt_fslabel); 1511 1512 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount"); 1513 if (mac_cache_fslabel_in_vnode) 1514 vp->v_vflag |= VV_CACHEDLABEL; 1515} 1516 1517/* 1518 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes 1519 * to store label data. Can be referenced by filesystems supporting 1520 * extended attributes. 1521 */ 1522int 1523vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap) 1524{ 1525 struct vnode *vp = ap->a_vp; 1526 struct mac extmac; 1527 int buflen, error; 1528 1529 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea"); 1530 1531 /* 1532 * Call out to external policies first. Order doesn't really 1533 * matter, as long as failure of one assures failure of all. 1534 */ 1535 error = mac_update_vnode_from_extattr(vp, vp->v_mount); 1536 if (error) 1537 return (error); 1538 1539 buflen = sizeof(extmac); 1540 error = vn_extattr_get(vp, IO_NODELOCKED, 1541 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen, 1542 (char *)&extmac, curthread); 1543 switch (error) { 1544 case 0: 1545 /* Got it */ 1546 break; 1547 1548 case ENOATTR: 1549 /* 1550 * Use the label from the mount point. 1551 */ 1552 mac_update_vnode_from_mount(vp, vp->v_mount); 1553 return (0); 1554 1555 case EOPNOTSUPP: 1556 default: 1557 /* Fail horribly. */ 1558 return (error); 1559 } 1560 1561 if (buflen != sizeof(extmac)) 1562 error = EPERM; /* Fail very closed. */ 1563 if (error == 0) 1564 error = mac_update_vnode_from_externalized(vp, &extmac); 1565 if (error == 0) 1566 vp->v_vflag |= VV_CACHEDLABEL; 1567 else { 1568 struct vattr va; 1569 1570 printf("Corrupted label on %s", 1571 vp->v_mount->mnt_stat.f_mntonname); 1572 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0) 1573 printf(" inum %ld", va.va_fileid); 1574#ifdef MAC_DEBUG 1575 if (mac_debug_label_fallback) { 1576 printf(", falling back.\n"); 1577 mac_update_vnode_from_mount(vp, vp->v_mount); 1578 error = 0; 1579 } else { 1580#endif 1581 printf(".\n"); 1582 error = EPERM; 1583#ifdef MAC_DEBUG 1584 } 1585#endif 1586 } 1587 1588 return (error); 1589} 1590 1591/* 1592 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle 1593 * the labeling activity outselves. Filesystems should be careful not 1594 * to change their minds regarding whether they support vop_refreshlabel() 1595 * for a vnode or not. Don't cache the vnode here, allow the file 1596 * system code to determine if it's safe to cache. If we update from 1597 * the mount, don't cache since a change to the mount label should affect 1598 * all vnodes. 1599 */ 1600static int 1601vn_refreshlabel(struct vnode *vp, struct ucred *cred) 1602{ 1603 int error; 1604 1605 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel"); 1606 1607 if (vp->v_mount == NULL) { 1608/* 1609 Eventually, we probably want to special-case refreshing 1610 of deadfs vnodes, and if there's a lock-free race somewhere, 1611 that case might be handled here. 1612 1613 mac_update_vnode_deadfs(vp); 1614 return (0); 1615 */ 1616 /* printf("vn_refreshlabel: null v_mount\n"); */ 1617 if (vp->v_type != VNON) 1618 printf( 1619 "vn_refreshlabel: null v_mount with non-VNON\n"); 1620 return (EBADF); 1621 } 1622 1623 if (vp->v_vflag & VV_CACHEDLABEL) { 1624 mac_vnode_label_cache_hits++; 1625 return (0); 1626 } else 1627 mac_vnode_label_cache_misses++; 1628 1629 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) { 1630 mac_update_vnode_from_mount(vp, vp->v_mount); 1631 return (0); 1632 } 1633 1634 error = VOP_REFRESHLABEL(vp, cred, curthread); 1635 switch (error) { 1636 case EOPNOTSUPP: 1637 /* 1638 * If labels are not supported on this vnode, fall back to 1639 * the label in the mount and propagate it to the vnode. 1640 * There should probably be some sort of policy/flag/decision 1641 * about doing this. 1642 */ 1643 mac_update_vnode_from_mount(vp, vp->v_mount); 1644 error = 0; 1645 default: 1646 return (error); 1647 } 1648} 1649 1650/* 1651 * Helper function for file systems using the vop_std*_ea() calls. This 1652 * function must be called after EA service is available for the vnode, 1653 * but before it's hooked up to the namespace so that the node persists 1654 * if there's a crash, or before it can be accessed. On successful 1655 * commit of the label to disk (etc), do cache the label. 1656 */ 1657int 1658vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred) 1659{ 1660 struct mac extmac; 1661 int error; 1662 1663 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea"); 1664 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) { 1665 mac_update_vnode_from_mount(tvp, tvp->v_mount); 1666 } else { 1667 error = vn_refreshlabel(dvp, cred); 1668 if (error) 1669 return (error); 1670 1671 /* 1672 * Stick the label in the vnode. Then try to write to 1673 * disk. If we fail, return a failure to abort the 1674 * create operation. Really, this failure shouldn't 1675 * happen except in fairly unusual circumstances (out 1676 * of disk, etc). 1677 */ 1678 mac_create_vnode(cred, dvp, tvp); 1679 1680 error = mac_stdcreatevnode_ea(tvp); 1681 if (error) 1682 return (error); 1683 1684 /* 1685 * XXX: Eventually this will go away and all policies will 1686 * directly manage their extended attributes. 1687 */ 1688 error = mac_externalize(&tvp->v_label, &extmac); 1689 if (error) 1690 return (error); 1691 1692 error = vn_extattr_set(tvp, IO_NODELOCKED, 1693 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, 1694 sizeof(extmac), (char *)&extmac, curthread); 1695 if (error == 0) 1696 tvp->v_vflag |= VV_CACHEDLABEL; 1697 else { 1698#if 0 1699 /* 1700 * In theory, we could have fall-back behavior here. 1701 * It would probably be incorrect. 1702 */ 1703#endif 1704 return (error); 1705 } 1706 } 1707 1708 return (0); 1709} 1710 1711void 1712mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp) 1713{ 1714 int error; 1715 1716 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 1717 1718 error = vn_refreshlabel(vp, old); 1719 if (error) { 1720 printf("mac_execve_transition: vn_refreshlabel returned %d\n", 1721 error); 1722 printf("mac_execve_transition: using old vnode label\n"); 1723 } 1724 1725 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label); 1726} 1727 1728int 1729mac_execve_will_transition(struct ucred *old, struct vnode *vp) 1730{ 1731 int error, result; 1732 1733 error = vn_refreshlabel(vp, old); 1734 if (error) 1735 return (error); 1736 1737 result = 0; 1738 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label); 1739 1740 return (result); 1741} 1742 1743int 1744mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags) 1745{ 1746 int error; 1747 1748 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 1749 1750 if (!mac_enforce_fs) 1751 return (0); 1752 1753 error = vn_refreshlabel(vp, cred); 1754 if (error) 1755 return (error); 1756 1757 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags); 1758 return (error); 1759} 1760 1761int 1762mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 1763{ 1764 int error; 1765 1766 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 1767 1768 if (!mac_enforce_fs) 1769 return (0); 1770 1771 error = vn_refreshlabel(dvp, cred); 1772 if (error) 1773 return (error); 1774 1775 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label); 1776 return (error); 1777} 1778 1779int 1780mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 1781{ 1782 int error; 1783 1784 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 1785 1786 if (!mac_enforce_fs) 1787 return (0); 1788 1789 error = vn_refreshlabel(dvp, cred); 1790 if (error) 1791 return (error); 1792 1793 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label); 1794 return (error); 1795} 1796 1797int 1798mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1799 struct componentname *cnp, struct vattr *vap) 1800{ 1801 int error; 1802 1803 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 1804 1805 if (!mac_enforce_fs) 1806 return (0); 1807 1808 error = vn_refreshlabel(dvp, cred); 1809 if (error) 1810 return (error); 1811 1812 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap); 1813 return (error); 1814} 1815 1816int 1817mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 1818 struct componentname *cnp) 1819{ 1820 int error; 1821 1822 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 1823 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 1824 1825 if (!mac_enforce_fs) 1826 return (0); 1827 1828 error = vn_refreshlabel(dvp, cred); 1829 if (error) 1830 return (error); 1831 error = vn_refreshlabel(vp, cred); 1832 if (error) 1833 return (error); 1834 1835 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp, 1836 &vp->v_label, cnp); 1837 return (error); 1838} 1839 1840int 1841mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1842 acl_type_t type) 1843{ 1844 int error; 1845 1846 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 1847 1848 if (!mac_enforce_fs) 1849 return (0); 1850 1851 error = vn_refreshlabel(vp, cred); 1852 if (error) 1853 return (error); 1854 1855 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type); 1856 return (error); 1857} 1858 1859int 1860mac_check_vnode_exec(struct ucred *cred, struct vnode *vp) 1861{ 1862 int error; 1863 1864 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 1865 1866 if (!mac_enforce_process && !mac_enforce_fs) 1867 return (0); 1868 1869 error = vn_refreshlabel(vp, cred); 1870 if (error) 1871 return (error); 1872 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label); 1873 1874 return (error); 1875} 1876 1877int 1878mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 1879{ 1880 int error; 1881 1882 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 1883 1884 if (!mac_enforce_fs) 1885 return (0); 1886 1887 error = vn_refreshlabel(vp, cred); 1888 if (error) 1889 return (error); 1890 1891 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); 1892 return (error); 1893} 1894 1895int 1896mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1897 int attrnamespace, const char *name, struct uio *uio) 1898{ 1899 int error; 1900 1901 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 1902 1903 if (!mac_enforce_fs) 1904 return (0); 1905 1906 error = vn_refreshlabel(vp, cred); 1907 if (error) 1908 return (error); 1909 1910 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, 1911 attrnamespace, name, uio); 1912 return (error); 1913} 1914 1915int 1916mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 1917 struct vnode *vp, struct componentname *cnp) 1918{ 1919 1920 int error; 1921 1922 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 1923 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 1924 1925 if (!mac_enforce_fs) 1926 return (0); 1927 1928 error = vn_refreshlabel(dvp, cred); 1929 if (error) 1930 return (error); 1931 1932 error = vn_refreshlabel(vp, cred); 1933 if (error) 1934 return (error); 1935 1936 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp, 1937 &vp->v_label, cnp); 1938 return (error); 1939} 1940 1941int 1942mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 1943 struct componentname *cnp) 1944{ 1945 int error; 1946 1947 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 1948 1949 if (!mac_enforce_fs) 1950 return (0); 1951 1952 error = vn_refreshlabel(dvp, cred); 1953 if (error) 1954 return (error); 1955 1956 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); 1957 return (error); 1958} 1959 1960int 1961mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot) 1962{ 1963 int error; 1964 1965 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 1966 1967 if (!mac_enforce_fs || !mac_enforce_vm) 1968 return (0); 1969 1970 error = vn_refreshlabel(vp, cred); 1971 if (error) 1972 return (error); 1973 1974 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot); 1975 return (error); 1976} 1977 1978void 1979mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 1980{ 1981 int result = *prot; 1982 1983 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 1984 1985 if (!mac_enforce_fs || !mac_enforce_vm) 1986 return; 1987 1988 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label, 1989 &result); 1990 1991 *prot = result; 1992} 1993 1994int 1995mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 1996{ 1997 int error; 1998 1999 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 2000 2001 if (!mac_enforce_fs || !mac_enforce_vm) 2002 return (0); 2003 2004 error = vn_refreshlabel(vp, cred); 2005 if (error) 2006 return (error); 2007 2008 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot); 2009 return (error); 2010} 2011 2012int 2013mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode) 2014{ 2015 int error; 2016 2017 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 2018 2019 if (!mac_enforce_fs) 2020 return (0); 2021 2022 error = vn_refreshlabel(vp, cred); 2023 if (error) 2024 return (error); 2025 2026 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); 2027 return (error); 2028} 2029 2030int 2031mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 2032 struct vnode *vp) 2033{ 2034 int error; 2035 2036 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 2037 2038 if (!mac_enforce_fs) 2039 return (0); 2040 2041 error = vn_refreshlabel(vp, active_cred); 2042 if (error) 2043 return (error); 2044 2045 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 2046 &vp->v_label); 2047 2048 return (error); 2049} 2050 2051int 2052mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 2053 struct vnode *vp) 2054{ 2055 int error; 2056 2057 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 2058 2059 if (!mac_enforce_fs) 2060 return (0); 2061 2062 error = vn_refreshlabel(vp, active_cred); 2063 if (error) 2064 return (error); 2065 2066 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 2067 &vp->v_label); 2068 2069 return (error); 2070} 2071 2072int 2073mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 2074{ 2075 int error; 2076 2077 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 2078 2079 if (!mac_enforce_fs) 2080 return (0); 2081 2082 error = vn_refreshlabel(dvp, cred); 2083 if (error) 2084 return (error); 2085 2086 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); 2087 return (error); 2088} 2089 2090int 2091mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 2092{ 2093 int error; 2094 2095 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 2096 2097 if (!mac_enforce_fs) 2098 return (0); 2099 2100 error = vn_refreshlabel(vp, cred); 2101 if (error) 2102 return (error); 2103 2104 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); 2105 return (error); 2106} 2107 2108static int 2109mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 2110 struct label *newlabel) 2111{ 2112 int error; 2113 2114 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 2115 2116 error = vn_refreshlabel(vp, cred); 2117 if (error) 2118 return (error); 2119 2120 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); 2121 2122 return (error); 2123} 2124 2125int 2126mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 2127 struct vnode *vp, struct componentname *cnp) 2128{ 2129 int error; 2130 2131 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 2132 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 2133 2134 if (!mac_enforce_fs) 2135 return (0); 2136 2137 error = vn_refreshlabel(dvp, cred); 2138 if (error) 2139 return (error); 2140 error = vn_refreshlabel(vp, cred); 2141 if (error) 2142 return (error); 2143 2144 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, 2145 &vp->v_label, cnp); 2146 return (error); 2147} 2148 2149int 2150mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 2151 struct vnode *vp, int samedir, struct componentname *cnp) 2152{ 2153 int error; 2154 2155 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 2156 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 2157 2158 if (!mac_enforce_fs) 2159 return (0); 2160 2161 error = vn_refreshlabel(dvp, cred); 2162 if (error) 2163 return (error); 2164 if (vp != NULL) { 2165 error = vn_refreshlabel(vp, cred); 2166 if (error) 2167 return (error); 2168 } 2169 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, 2170 vp != NULL ? &vp->v_label : NULL, samedir, cnp); 2171 return (error); 2172} 2173 2174int 2175mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 2176{ 2177 int error; 2178 2179 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 2180 2181 if (!mac_enforce_fs) 2182 return (0); 2183 2184 error = vn_refreshlabel(vp, cred); 2185 if (error) 2186 return (error); 2187 2188 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); 2189 return (error); 2190} 2191 2192int 2193mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 2194 struct acl *acl) 2195{ 2196 int error; 2197 2198 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 2199 2200 if (!mac_enforce_fs) 2201 return (0); 2202 2203 error = vn_refreshlabel(vp, cred); 2204 if (error) 2205 return (error); 2206 2207 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); 2208 return (error); 2209} 2210 2211int 2212mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 2213 int attrnamespace, const char *name, struct uio *uio) 2214{ 2215 int error; 2216 2217 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 2218 2219 if (!mac_enforce_fs) 2220 return (0); 2221 2222 error = vn_refreshlabel(vp, cred); 2223 if (error) 2224 return (error); 2225 2226 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, 2227 attrnamespace, name, uio); 2228 return (error); 2229} 2230 2231int 2232mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 2233{ 2234 int error; 2235 2236 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 2237 2238 if (!mac_enforce_fs) 2239 return (0); 2240 2241 error = vn_refreshlabel(vp, cred); 2242 if (error) 2243 return (error); 2244 2245 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); 2246 return (error); 2247} 2248 2249int 2250mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 2251{ 2252 int error; 2253 2254 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 2255 2256 if (!mac_enforce_fs) 2257 return (0); 2258 2259 error = vn_refreshlabel(vp, cred); 2260 if (error) 2261 return (error); 2262 2263 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); 2264 return (error); 2265} 2266 2267int 2268mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 2269 gid_t gid) 2270{ 2271 int error; 2272 2273 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 2274 2275 if (!mac_enforce_fs) 2276 return (0); 2277 2278 error = vn_refreshlabel(vp, cred); 2279 if (error) 2280 return (error); 2281 2282 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); 2283 return (error); 2284} 2285 2286int 2287mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 2288 struct timespec atime, struct timespec mtime) 2289{ 2290 int error; 2291 2292 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 2293 2294 if (!mac_enforce_fs) 2295 return (0); 2296 2297 error = vn_refreshlabel(vp, cred); 2298 if (error) 2299 return (error); 2300 2301 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, 2302 mtime); 2303 return (error); 2304} 2305 2306int 2307mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2308 struct vnode *vp) 2309{ 2310 int error; 2311 2312 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 2313 2314 if (!mac_enforce_fs) 2315 return (0); 2316 2317 error = vn_refreshlabel(vp, active_cred); 2318 if (error) 2319 return (error); 2320 2321 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 2322 &vp->v_label); 2323 return (error); 2324} 2325 2326int 2327mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 2328 struct vnode *vp) 2329{ 2330 int error; 2331 2332 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 2333 2334 if (!mac_enforce_fs) 2335 return (0); 2336 2337 error = vn_refreshlabel(vp, active_cred); 2338 if (error) 2339 return (error); 2340 2341 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 2342 &vp->v_label); 2343 2344 return (error); 2345} 2346 2347/* 2348 * When relabeling a process, call out to the policies for the maximum 2349 * permission allowed for each object type we know about in its 2350 * memory space, and revoke access (in the least surprising ways we 2351 * know) when necessary. The process lock is not held here. 2352 */ 2353static void 2354mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) 2355{ 2356 2357 /* XXX freeze all other threads */ 2358 mac_cred_mmapped_drop_perms_recurse(td, cred, 2359 &td->td_proc->p_vmspace->vm_map); 2360 /* XXX allow other threads to continue */ 2361} 2362 2363static __inline const char * 2364prot2str(vm_prot_t prot) 2365{ 2366 2367 switch (prot & VM_PROT_ALL) { 2368 case VM_PROT_READ: 2369 return ("r--"); 2370 case VM_PROT_READ | VM_PROT_WRITE: 2371 return ("rw-"); 2372 case VM_PROT_READ | VM_PROT_EXECUTE: 2373 return ("r-x"); 2374 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 2375 return ("rwx"); 2376 case VM_PROT_WRITE: 2377 return ("-w-"); 2378 case VM_PROT_EXECUTE: 2379 return ("--x"); 2380 case VM_PROT_WRITE | VM_PROT_EXECUTE: 2381 return ("-wx"); 2382 default: 2383 return ("---"); 2384 } 2385} 2386 2387static void 2388mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, 2389 struct vm_map *map) 2390{ 2391 struct vm_map_entry *vme; 2392 int result; 2393 vm_prot_t revokeperms; 2394 vm_object_t object; 2395 vm_ooffset_t offset; 2396 struct vnode *vp; 2397 2398 if (!mac_mmap_revocation) 2399 return; 2400 2401 vm_map_lock_read(map); 2402 for (vme = map->header.next; vme != &map->header; vme = vme->next) { 2403 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { 2404 mac_cred_mmapped_drop_perms_recurse(td, cred, 2405 vme->object.sub_map); 2406 continue; 2407 } 2408 /* 2409 * Skip over entries that obviously are not shared. 2410 */ 2411 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || 2412 !vme->max_protection) 2413 continue; 2414 /* 2415 * Drill down to the deepest backing object. 2416 */ 2417 offset = vme->offset; 2418 object = vme->object.vm_object; 2419 if (object == NULL) 2420 continue; 2421 while (object->backing_object != NULL) { 2422 object = object->backing_object; 2423 offset += object->backing_object_offset; 2424 } 2425 /* 2426 * At the moment, vm_maps and objects aren't considered 2427 * by the MAC system, so only things with backing by a 2428 * normal object (read: vnodes) are checked. 2429 */ 2430 if (object->type != OBJT_VNODE) 2431 continue; 2432 vp = (struct vnode *)object->handle; 2433 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2434 result = vme->max_protection; 2435 mac_check_vnode_mmap_downgrade(cred, vp, &result); 2436 VOP_UNLOCK(vp, 0, td); 2437 /* 2438 * Find out what maximum protection we may be allowing 2439 * now but a policy needs to get removed. 2440 */ 2441 revokeperms = vme->max_protection & ~result; 2442 if (!revokeperms) 2443 continue; 2444 printf("pid %ld: revoking %s perms from %#lx:%ld " 2445 "(max %s/cur %s)\n", (long)td->td_proc->p_pid, 2446 prot2str(revokeperms), (u_long)vme->start, 2447 (long)(vme->end - vme->start), 2448 prot2str(vme->max_protection), prot2str(vme->protection)); 2449 vm_map_lock_upgrade(map); 2450 /* 2451 * This is the really simple case: if a map has more 2452 * max_protection than is allowed, but it's not being 2453 * actually used (that is, the current protection is 2454 * still allowed), we can just wipe it out and do 2455 * nothing more. 2456 */ 2457 if ((vme->protection & revokeperms) == 0) { 2458 vme->max_protection -= revokeperms; 2459 } else { 2460 if (revokeperms & VM_PROT_WRITE) { 2461 /* 2462 * In the more complicated case, flush out all 2463 * pending changes to the object then turn it 2464 * copy-on-write. 2465 */ 2466 vm_object_reference(object); 2467 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2468 vm_object_page_clean(object, 2469 OFF_TO_IDX(offset), 2470 OFF_TO_IDX(offset + vme->end - vme->start + 2471 PAGE_MASK), 2472 OBJPC_SYNC); 2473 VOP_UNLOCK(vp, 0, td); 2474 vm_object_deallocate(object); 2475 /* 2476 * Why bother if there's no read permissions 2477 * anymore? For the rest, we need to leave 2478 * the write permissions on for COW, or 2479 * remove them entirely if configured to. 2480 */ 2481 if (!mac_mmap_revocation_via_cow) { 2482 vme->max_protection &= ~VM_PROT_WRITE; 2483 vme->protection &= ~VM_PROT_WRITE; 2484 } if ((revokeperms & VM_PROT_READ) == 0) 2485 vme->eflags |= MAP_ENTRY_COW | 2486 MAP_ENTRY_NEEDS_COPY; 2487 } 2488 if (revokeperms & VM_PROT_EXECUTE) { 2489 vme->max_protection &= ~VM_PROT_EXECUTE; 2490 vme->protection &= ~VM_PROT_EXECUTE; 2491 } 2492 if (revokeperms & VM_PROT_READ) { 2493 vme->max_protection = 0; 2494 vme->protection = 0; 2495 } 2496 pmap_protect(map->pmap, vme->start, vme->end, 2497 vme->protection & ~revokeperms); 2498 vm_map_simplify_entry(map, vme); 2499 } 2500 vm_map_lock_downgrade(map); 2501 } 2502 vm_map_unlock_read(map); 2503} 2504 2505/* 2506 * When the subject's label changes, it may require revocation of privilege 2507 * to mapped objects. This can't be done on-the-fly later with a unified 2508 * buffer cache. 2509 */ 2510static void 2511mac_relabel_cred(struct ucred *cred, struct label *newlabel) 2512{ 2513 2514 MAC_PERFORM(relabel_cred, cred, newlabel); 2515} 2516 2517void 2518mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 2519{ 2520 2521 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); 2522} 2523 2524void 2525mac_create_ifnet(struct ifnet *ifnet) 2526{ 2527 2528 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label); 2529} 2530 2531void 2532mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d) 2533{ 2534 2535 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label); 2536} 2537 2538void 2539mac_create_socket(struct ucred *cred, struct socket *socket) 2540{ 2541 2542 MAC_PERFORM(create_socket, cred, socket, &socket->so_label); 2543} 2544 2545void 2546mac_create_pipe(struct ucred *cred, struct pipe *pipe) 2547{ 2548 2549 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); 2550} 2551 2552void 2553mac_create_socket_from_socket(struct socket *oldsocket, 2554 struct socket *newsocket) 2555{ 2556 2557 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label, 2558 newsocket, &newsocket->so_label); 2559} 2560 2561static void 2562mac_relabel_socket(struct ucred *cred, struct socket *socket, 2563 struct label *newlabel) 2564{ 2565 2566 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); 2567} 2568 2569static void 2570mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) 2571{ 2572 2573 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); 2574} 2575 2576void 2577mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) 2578{ 2579 2580 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label, 2581 socket, &socket->so_peerlabel); 2582} 2583 2584void 2585mac_set_socket_peer_from_socket(struct socket *oldsocket, 2586 struct socket *newsocket) 2587{ 2588 2589 MAC_PERFORM(set_socket_peer_from_socket, oldsocket, 2590 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel); 2591} 2592 2593void 2594mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram) 2595{ 2596 2597 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label, 2598 datagram, &datagram->m_pkthdr.label); 2599} 2600 2601void 2602mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment) 2603{ 2604 2605 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label, 2606 fragment, &fragment->m_pkthdr.label); 2607} 2608 2609void 2610mac_create_ipq(struct mbuf *fragment, struct ipq *ipq) 2611{ 2612 2613 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq, 2614 &ipq->ipq_label); 2615} 2616 2617void 2618mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2619{ 2620 2621 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label, 2622 newmbuf, &newmbuf->m_pkthdr.label); 2623} 2624 2625void 2626mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf) 2627{ 2628 2629 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf, 2630 &mbuf->m_pkthdr.label); 2631} 2632 2633void 2634mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf) 2635{ 2636 2637 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf, 2638 &mbuf->m_pkthdr.label); 2639} 2640 2641void 2642mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf) 2643{ 2644 2645 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf, 2646 &mbuf->m_pkthdr.label); 2647} 2648 2649void 2650mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet, 2651 struct mbuf *newmbuf) 2652{ 2653 2654 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, 2655 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf, 2656 &newmbuf->m_pkthdr.label); 2657} 2658 2659void 2660mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2661{ 2662 2663 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label, 2664 newmbuf, &newmbuf->m_pkthdr.label); 2665} 2666 2667int 2668mac_fragment_match(struct mbuf *fragment, struct ipq *ipq) 2669{ 2670 int result; 2671 2672 result = 1; 2673 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label, 2674 ipq, &ipq->ipq_label); 2675 2676 return (result); 2677} 2678 2679void 2680mac_update_ipq(struct mbuf *fragment, struct ipq *ipq) 2681{ 2682 2683 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq, 2684 &ipq->ipq_label); 2685} 2686 2687void 2688mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) 2689{ 2690 2691 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf, 2692 &mbuf->m_pkthdr.label); 2693} 2694 2695void 2696mac_create_mount(struct ucred *cred, struct mount *mp) 2697{ 2698 2699 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, 2700 &mp->mnt_fslabel); 2701} 2702 2703void 2704mac_create_root_mount(struct ucred *cred, struct mount *mp) 2705{ 2706 2707 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, 2708 &mp->mnt_fslabel); 2709} 2710 2711int 2712mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) 2713{ 2714 int error; 2715 2716 if (!mac_enforce_network) 2717 return (0); 2718 2719 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet, 2720 &ifnet->if_label); 2721 2722 return (error); 2723} 2724 2725static int 2726mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) 2727{ 2728 int error; 2729 2730 MAC_CHECK(check_cred_relabel, cred, newlabel); 2731 2732 return (error); 2733} 2734 2735int 2736mac_check_cred_visible(struct ucred *u1, struct ucred *u2) 2737{ 2738 int error; 2739 2740 if (!mac_enforce_process) 2741 return (0); 2742 2743 MAC_CHECK(check_cred_visible, u1, u2); 2744 2745 return (error); 2746} 2747 2748int 2749mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) 2750{ 2751 int error; 2752 2753 if (!mac_enforce_network) 2754 return (0); 2755 2756 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr")); 2757 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED)) 2758 printf("%s%d: not initialized\n", ifnet->if_name, 2759 ifnet->if_unit); 2760 2761 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf, 2762 &mbuf->m_pkthdr.label); 2763 2764 return (error); 2765} 2766 2767int 2768mac_check_mount_stat(struct ucred *cred, struct mount *mount) 2769{ 2770 int error; 2771 2772 if (!mac_enforce_fs) 2773 return (0); 2774 2775 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); 2776 2777 return (error); 2778} 2779 2780int 2781mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, 2782 void *data) 2783{ 2784 int error; 2785 2786 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2787 2788 if (!mac_enforce_pipe) 2789 return (0); 2790 2791 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); 2792 2793 return (error); 2794} 2795 2796int 2797mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) 2798{ 2799 int error; 2800 2801 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2802 2803 if (!mac_enforce_pipe) 2804 return (0); 2805 2806 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); 2807 2808 return (error); 2809} 2810 2811int 2812mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) 2813{ 2814 int error; 2815 2816 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2817 2818 if (!mac_enforce_pipe) 2819 return (0); 2820 2821 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); 2822 2823 return (error); 2824} 2825 2826static int 2827mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 2828 struct label *newlabel) 2829{ 2830 int error; 2831 2832 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2833 2834 if (!mac_enforce_pipe) 2835 return (0); 2836 2837 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); 2838 2839 return (error); 2840} 2841 2842int 2843mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) 2844{ 2845 int error; 2846 2847 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2848 2849 if (!mac_enforce_pipe) 2850 return (0); 2851 2852 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); 2853 2854 return (error); 2855} 2856 2857int 2858mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) 2859{ 2860 int error; 2861 2862 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2863 2864 if (!mac_enforce_pipe) 2865 return (0); 2866 2867 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); 2868 2869 return (error); 2870} 2871 2872int 2873mac_check_proc_debug(struct ucred *cred, struct proc *proc) 2874{ 2875 int error; 2876 2877 PROC_LOCK_ASSERT(proc, MA_OWNED); 2878 2879 if (!mac_enforce_process) 2880 return (0); 2881 2882 MAC_CHECK(check_proc_debug, cred, proc); 2883 2884 return (error); 2885} 2886 2887int 2888mac_check_proc_sched(struct ucred *cred, struct proc *proc) 2889{ 2890 int error; 2891 2892 PROC_LOCK_ASSERT(proc, MA_OWNED); 2893 2894 if (!mac_enforce_process) 2895 return (0); 2896 2897 MAC_CHECK(check_proc_sched, cred, proc); 2898 2899 return (error); 2900} 2901 2902int 2903mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 2904{ 2905 int error; 2906 2907 PROC_LOCK_ASSERT(proc, MA_OWNED); 2908 2909 if (!mac_enforce_process) 2910 return (0); 2911 2912 MAC_CHECK(check_proc_signal, cred, proc, signum); 2913 2914 return (error); 2915} 2916 2917int 2918mac_check_socket_bind(struct ucred *ucred, struct socket *socket, 2919 struct sockaddr *sockaddr) 2920{ 2921 int error; 2922 2923 if (!mac_enforce_socket) 2924 return (0); 2925 2926 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label, 2927 sockaddr); 2928 2929 return (error); 2930} 2931 2932int 2933mac_check_socket_connect(struct ucred *cred, struct socket *socket, 2934 struct sockaddr *sockaddr) 2935{ 2936 int error; 2937 2938 if (!mac_enforce_socket) 2939 return (0); 2940 2941 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label, 2942 sockaddr); 2943 2944 return (error); 2945} 2946 2947int 2948mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf) 2949{ 2950 int error; 2951 2952 if (!mac_enforce_socket) 2953 return (0); 2954 2955 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf, 2956 &mbuf->m_pkthdr.label); 2957 2958 return (error); 2959} 2960 2961int 2962mac_check_socket_listen(struct ucred *cred, struct socket *socket) 2963{ 2964 int error; 2965 2966 if (!mac_enforce_socket) 2967 return (0); 2968 2969 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label); 2970 return (error); 2971} 2972 2973int 2974mac_check_socket_receive(struct ucred *cred, struct socket *so) 2975{ 2976 int error; 2977 2978 if (!mac_enforce_socket) 2979 return (0); 2980 2981 MAC_CHECK(check_socket_receive, cred, so, &so->so_label); 2982 2983 return (error); 2984} 2985 2986static int 2987mac_check_socket_relabel(struct ucred *cred, struct socket *socket, 2988 struct label *newlabel) 2989{ 2990 int error; 2991 2992 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label, 2993 newlabel); 2994 2995 return (error); 2996} 2997 2998int 2999mac_check_socket_send(struct ucred *cred, struct socket *so) 3000{ 3001 int error; 3002 3003 if (!mac_enforce_socket) 3004 return (0); 3005 3006 MAC_CHECK(check_socket_send, cred, so, &so->so_label); 3007 3008 return (error); 3009} 3010 3011int 3012mac_check_socket_visible(struct ucred *cred, struct socket *socket) 3013{ 3014 int error; 3015 3016 if (!mac_enforce_socket) 3017 return (0); 3018 3019 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label); 3020 3021 return (error); 3022} 3023 3024int 3025mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 3026 struct ifnet *ifnet) 3027{ 3028 struct mac label; 3029 int error; 3030 3031 error = mac_externalize(&ifnet->if_label, &label); 3032 if (error) 3033 return (error); 3034 3035 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label))); 3036} 3037 3038int 3039mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 3040 struct ifnet *ifnet) 3041{ 3042 struct mac newlabel; 3043 struct label intlabel; 3044 int error; 3045 3046 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel)); 3047 if (error) 3048 return (error); 3049 3050 error = mac_internalize(&intlabel, &newlabel); 3051 if (error) 3052 return (error); 3053 3054 /* 3055 * XXX: Note that this is a redundant privilege check, since 3056 * policies impose this check themselves if required by the 3057 * policy. Eventually, this should go away. 3058 */ 3059 error = suser_cred(cred, 0); 3060 if (error) 3061 goto out; 3062 3063 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label, 3064 &intlabel); 3065 if (error) 3066 goto out; 3067 3068 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel); 3069 3070out: 3071 mac_destroy_temp(&intlabel); 3072 return (error); 3073} 3074 3075void 3076mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp) 3077{ 3078 3079 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label); 3080} 3081 3082void 3083mac_create_devfs_device(dev_t dev, struct devfs_dirent *de) 3084{ 3085 3086 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label); 3087} 3088 3089void 3090mac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd, 3091 struct devfs_dirent *de) 3092{ 3093 3094 MAC_PERFORM(create_devfs_symlink, cred, dd, &dd->de_label, de, 3095 &de->de_label); 3096} 3097 3098static int 3099mac_stdcreatevnode_ea(struct vnode *vp) 3100{ 3101 int error; 3102 3103 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label); 3104 3105 return (error); 3106} 3107 3108void 3109mac_create_devfs_directory(char *dirname, int dirnamelen, 3110 struct devfs_dirent *de) 3111{ 3112 3113 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de, 3114 &de->de_label); 3115} 3116 3117/* 3118 * When a new vnode is created, this call will initialize its label. 3119 */ 3120void 3121mac_create_vnode(struct ucred *cred, struct vnode *parent, 3122 struct vnode *child) 3123{ 3124 int error; 3125 3126 ASSERT_VOP_LOCKED(parent, "mac_create_vnode"); 3127 ASSERT_VOP_LOCKED(child, "mac_create_vnode"); 3128 3129 error = vn_refreshlabel(parent, cred); 3130 if (error) { 3131 printf("mac_create_vnode: vn_refreshlabel returned %d\n", 3132 error); 3133 printf("mac_create_vnode: using old vnode label\n"); 3134 } 3135 3136 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child, 3137 &child->v_label); 3138} 3139 3140int 3141mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 3142 struct mac *extmac) 3143{ 3144 struct label intlabel; 3145 int error; 3146 3147 error = mac_internalize(&intlabel, extmac); 3148 if (error) 3149 return (error); 3150 3151 mac_check_socket_relabel(cred, so, &intlabel); 3152 if (error) { 3153 mac_destroy_temp(&intlabel); 3154 return (error); 3155 } 3156 3157 mac_relabel_socket(cred, so, &intlabel); 3158 3159 mac_destroy_temp(&intlabel); 3160 return (0); 3161} 3162 3163int 3164mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) 3165{ 3166 int error; 3167 3168 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 3169 3170 error = mac_check_pipe_relabel(cred, pipe, label); 3171 if (error) 3172 return (error); 3173 3174 mac_relabel_pipe(cred, pipe, label); 3175 3176 return (0); 3177} 3178 3179int 3180mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 3181 struct mac *extmac) 3182{ 3183 3184 return (mac_externalize(&so->so_label, extmac)); 3185} 3186 3187int 3188mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 3189 struct mac *extmac) 3190{ 3191 3192 return (mac_externalize(&so->so_peerlabel, extmac)); 3193} 3194 3195/* 3196 * Implementation of VOP_SETLABEL() that relies on extended attributes 3197 * to store label data. Can be referenced by filesystems supporting 3198 * extended attributes. 3199 */ 3200int 3201vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 3202{ 3203 struct vnode *vp = ap->a_vp; 3204 struct label *intlabel = ap->a_label; 3205 struct mac extmac; 3206 int error; 3207 3208 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 3209 3210 /* 3211 * XXX: Eventually call out to EA check/set calls here. 3212 * Be particularly careful to avoid race conditions, 3213 * consistency problems, and stability problems when 3214 * dealing with multiple EAs. In particular, we require 3215 * the ability to write multiple EAs on the same file in 3216 * a single transaction, which the current EA interface 3217 * does not provide. 3218 */ 3219 3220 error = mac_externalize(intlabel, &extmac); 3221 if (error) 3222 return (error); 3223 3224 error = vn_extattr_set(vp, IO_NODELOCKED, 3225 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, 3226 sizeof(extmac), (char *)&extmac, curthread); 3227 if (error) 3228 return (error); 3229 3230 mac_relabel_vnode(ap->a_cred, vp, intlabel); 3231 3232 vp->v_vflag |= VV_CACHEDLABEL; 3233 3234 return (0); 3235} 3236 3237static int 3238vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 3239{ 3240 int error; 3241 3242 if (vp->v_mount == NULL) { 3243 /* printf("vn_setlabel: null v_mount\n"); */ 3244 if (vp->v_type != VNON) 3245 printf("vn_setlabel: null v_mount with non-VNON\n"); 3246 return (EBADF); 3247 } 3248 3249 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3250 return (EOPNOTSUPP); 3251 3252 /* 3253 * Multi-phase commit. First check the policies to confirm the 3254 * change is OK. Then commit via the filesystem. Finally, 3255 * update the actual vnode label. Question: maybe the filesystem 3256 * should update the vnode at the end as part of VOP_SETLABEL()? 3257 */ 3258 error = mac_check_vnode_relabel(cred, vp, intlabel); 3259 if (error) 3260 return (error); 3261 3262 /* 3263 * VADMIN provides the opportunity for the filesystem to make 3264 * decisions about who is and is not able to modify labels 3265 * and protections on files. This might not be right. We can't 3266 * assume VOP_SETLABEL() will do it, because we might implement 3267 * that as part of vop_stdsetlabel_ea(). 3268 */ 3269 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 3270 if (error) 3271 return (error); 3272 3273 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 3274 if (error) 3275 return (error); 3276 3277 return (0); 3278} 3279 3280/* 3281 * MPSAFE 3282 */ 3283int 3284__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3285{ 3286 struct mac extmac; 3287 int error; 3288 3289 error = mac_externalize(&td->td_ucred->cr_label, &extmac); 3290 if (error == 0) 3291 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3292 3293 return (error); 3294} 3295 3296/* 3297 * MPSAFE 3298 */ 3299int 3300__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3301{ 3302 struct ucred *newcred, *oldcred; 3303 struct proc *p; 3304 struct mac extmac; 3305 struct label intlabel; 3306 int error; 3307 3308 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3309 if (error) 3310 return (error); 3311 3312 error = mac_internalize(&intlabel, &extmac); 3313 if (error) 3314 return (error); 3315 3316 newcred = crget(); 3317 3318 p = td->td_proc; 3319 PROC_LOCK(p); 3320 oldcred = p->p_ucred; 3321 3322 error = mac_check_cred_relabel(oldcred, &intlabel); 3323 if (error) { 3324 PROC_UNLOCK(p); 3325 mac_destroy_temp(&intlabel); 3326 crfree(newcred); 3327 return (error); 3328 } 3329 3330 setsugid(p); 3331 crcopy(newcred, oldcred); 3332 mac_relabel_cred(newcred, &intlabel); 3333 p->p_ucred = newcred; 3334 3335 /* 3336 * Grab additional reference for use while revoking mmaps, prior 3337 * to releasing the proc lock and sharing the cred. 3338 */ 3339 crhold(newcred); 3340 PROC_UNLOCK(p); 3341 3342 mtx_lock(&Giant); 3343 mac_cred_mmapped_drop_perms(td, newcred); 3344 mtx_unlock(&Giant); 3345 3346 crfree(newcred); /* Free revocation reference. */ 3347 crfree(oldcred); 3348 mac_destroy_temp(&intlabel); 3349 return (0); 3350} 3351 3352/* 3353 * MPSAFE 3354 */ 3355int 3356__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3357{ 3358 struct file *fp; 3359 struct mac extmac; 3360 struct vnode *vp; 3361 struct pipe *pipe; 3362 int error; 3363 3364 mtx_lock(&Giant); 3365 3366 error = fget(td, SCARG(uap, fd), &fp); 3367 if (error) 3368 goto out; 3369 3370 switch (fp->f_type) { 3371 case DTYPE_FIFO: 3372 case DTYPE_VNODE: 3373 vp = (struct vnode *)fp->f_data; 3374 3375 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3376 error = vn_refreshlabel(vp, td->td_ucred); 3377 if (error == 0) 3378 error = mac_externalize(&vp->v_label, &extmac); 3379 VOP_UNLOCK(vp, 0, td); 3380 break; 3381 case DTYPE_PIPE: 3382 pipe = (struct pipe *)fp->f_data; 3383 error = mac_externalize(pipe->pipe_label, &extmac); 3384 break; 3385 default: 3386 error = EINVAL; 3387 } 3388 3389 if (error == 0) 3390 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3391 3392 fdrop(fp, td); 3393 3394out: 3395 mtx_unlock(&Giant); 3396 return (error); 3397} 3398 3399/* 3400 * MPSAFE 3401 */ 3402int 3403__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3404{ 3405 struct nameidata nd; 3406 struct mac extmac; 3407 int error; 3408 3409 mtx_lock(&Giant); 3410 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, 3411 SCARG(uap, path_p), td); 3412 error = namei(&nd); 3413 if (error) 3414 goto out; 3415 3416 error = vn_refreshlabel(nd.ni_vp, td->td_ucred); 3417 if (error == 0) 3418 error = mac_externalize(&nd.ni_vp->v_label, &extmac); 3419 NDFREE(&nd, 0); 3420 if (error) 3421 goto out; 3422 3423 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3424 3425out: 3426 mtx_unlock(&Giant); 3427 return (error); 3428} 3429 3430/* 3431 * MPSAFE 3432 */ 3433int 3434__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3435{ 3436 struct file *fp; 3437 struct mac extmac; 3438 struct label intlabel; 3439 struct mount *mp; 3440 struct vnode *vp; 3441 struct pipe *pipe; 3442 int error; 3443 3444 mtx_lock(&Giant); 3445 error = fget(td, SCARG(uap, fd), &fp); 3446 if (error) 3447 goto out1; 3448 3449 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3450 if (error) 3451 goto out2; 3452 3453 error = mac_internalize(&intlabel, &extmac); 3454 if (error) 3455 goto out2; 3456 3457 switch (fp->f_type) { 3458 case DTYPE_FIFO: 3459 case DTYPE_VNODE: 3460 vp = (struct vnode *)fp->f_data; 3461 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3462 if (error != 0) 3463 break; 3464 3465 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3466 error = vn_setlabel(vp, &intlabel, td->td_ucred); 3467 VOP_UNLOCK(vp, 0, td); 3468 vn_finished_write(mp); 3469 mac_destroy_temp(&intlabel); 3470 break; 3471 case DTYPE_PIPE: 3472 pipe = (struct pipe *)fp->f_data; 3473 PIPE_LOCK(pipe); 3474 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel); 3475 PIPE_UNLOCK(pipe); 3476 break; 3477 default: 3478 error = EINVAL; 3479 } 3480 3481out2: 3482 fdrop(fp, td); 3483out1: 3484 mtx_unlock(&Giant); 3485 return (error); 3486} 3487 3488/* 3489 * MPSAFE 3490 */ 3491int 3492__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3493{ 3494 struct nameidata nd; 3495 struct mac extmac; 3496 struct label intlabel; 3497 struct mount *mp; 3498 int error; 3499 3500 mtx_lock(&Giant); 3501 3502 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3503 if (error) 3504 goto out; 3505 3506 error = mac_internalize(&intlabel, &extmac); 3507 if (error) 3508 goto out; 3509 3510 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, 3511 SCARG(uap, path_p), td); 3512 error = namei(&nd); 3513 if (error) 3514 goto out2; 3515 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3516 if (error) 3517 goto out2; 3518 3519 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred); 3520 3521 vn_finished_write(mp); 3522out2: 3523 mac_destroy_temp(&intlabel); 3524 NDFREE(&nd, 0); 3525out: 3526 mtx_unlock(&Giant); 3527 return (error); 3528} 3529 3530int 3531mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3532{ 3533 struct mac_policy_conf *mpc; 3534 char target[MAC_MAX_POLICY_NAME]; 3535 int error; 3536 3537 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL); 3538 if (error) 3539 return (error); 3540 3541 error = ENOSYS; 3542 MAC_POLICY_LIST_BUSY(); 3543 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3544 if (strcmp(mpc->mpc_name, target) == 0 && 3545 mpc->mpc_ops->mpo_syscall != NULL) { 3546 error = mpc->mpc_ops->mpo_syscall(td, 3547 SCARG(uap, call), SCARG(uap, arg)); 3548 goto out; 3549 } 3550 } 3551 3552out: 3553 MAC_POLICY_LIST_UNBUSY(); 3554 return (error); 3555} 3556 3557SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); 3558SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); 3559 3560#else /* !MAC */ 3561 3562int 3563__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3564{ 3565 3566 return (ENOSYS); 3567} 3568 3569int 3570__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3571{ 3572 3573 return (ENOSYS); 3574} 3575 3576int 3577__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3578{ 3579 3580 return (ENOSYS); 3581} 3582 3583int 3584__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3585{ 3586 3587 return (ENOSYS); 3588} 3589 3590int 3591__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3592{ 3593 3594 return (ENOSYS); 3595} 3596 3597int 3598__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3599{ 3600 3601 return (ENOSYS); 3602} 3603 3604int 3605mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3606{ 3607 3608 return (ENOSYS); 3609} 3610 3611#endif /* !MAC */
| 106static unsigned int mac_max_policies = MAC_MAX_POLICIES; 107static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1; 108SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD, 109 &mac_max_policies, 0, ""); 110 111static int mac_late = 0; 112 113static int mac_enforce_fs = 1; 114SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW, 115 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects"); 116TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs); 117 118static int mac_enforce_network = 1; 119SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW, 120 &mac_enforce_network, 0, "Enforce MAC policy on network packets"); 121TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network); 122 123static int mac_enforce_pipe = 1; 124SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW, 125 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations"); 126TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe); 127 128static int mac_enforce_process = 1; 129SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW, 130 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations"); 131TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process); 132 133static int mac_enforce_socket = 1; 134SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW, 135 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations"); 136TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket); 137 138static int mac_enforce_vm = 1; 139SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW, 140 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations"); 141TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm); 142 143static int mac_label_size = sizeof(struct mac); 144SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD, 145 &mac_label_size, 0, "Pre-compiled MAC label size"); 146 147static int mac_cache_fslabel_in_vnode = 1; 148SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW, 149 &mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode"); 150TUNABLE_INT("security.mac.cache_fslabel_in_vnode", 151 &mac_cache_fslabel_in_vnode); 152 153static int mac_vnode_label_cache_hits = 0; 154SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD, 155 &mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels"); 156static int mac_vnode_label_cache_misses = 0; 157SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD, 158 &mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels"); 159 160static int mac_mmap_revocation = 1; 161SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW, 162 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject " 163 "relabel"); 164static int mac_mmap_revocation_via_cow = 0; 165SYSCTL_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 170SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0, 171 "TrustedBSD MAC debug info"); 172 173static int mac_debug_label_fallback = 0; 174SYSCTL_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."); 177TUNABLE_INT("security.mac.debug_label_fallback", 178 &mac_debug_label_fallback); 179 180SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0, 181 "TrustedBSD MAC object counters"); 182 183static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs, 184 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents, 185 nmacipqs, nmacpipes; 186 187SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD, 188 &nmacmbufs, 0, "number of mbufs in use"); 189SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD, 190 &nmaccreds, 0, "number of ucreds in use"); 191SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD, 192 &nmacifnets, 0, "number of ifnets in use"); 193SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD, 194 &nmacipqs, 0, "number of ipqs in use"); 195SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD, 196 &nmacbpfdescs, 0, "number of bpfdescs in use"); 197SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD, 198 &nmacsockets, 0, "number of sockets in use"); 199SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD, 200 &nmacpipes, 0, "number of pipes in use"); 201SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD, 202 &nmacmounts, 0, "number of mounts in use"); 203SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD, 204 &nmactemp, 0, "number of temporary labels in use"); 205SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD, 206 &nmacvnodes, 0, "number of vnodes in use"); 207SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD, 208 &nmacdevfsdirents, 0, "number of devfs dirents inuse"); 209#endif 210 211static int error_select(int error1, int error2); 212static int mac_externalize(struct label *label, struct mac *mac); 213static int mac_policy_register(struct mac_policy_conf *mpc); 214static int mac_policy_unregister(struct mac_policy_conf *mpc); 215 216static int mac_stdcreatevnode_ea(struct vnode *vp); 217static void mac_check_vnode_mmap_downgrade(struct ucred *cred, 218 struct vnode *vp, int *prot); 219static void mac_cred_mmapped_drop_perms_recurse(struct thread *td, 220 struct ucred *cred, struct vm_map *map); 221 222static void mac_destroy_socket_label(struct label *label); 223 224MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector"); 225MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes"); 226 227/* 228 * mac_policy_list_lock protects the consistency of 'mac_policy_list', 229 * the linked list of attached policy modules. Read-only consumers of 230 * the list must acquire a shared lock for the duration of their use; 231 * writers must acquire an exclusive lock. Note that for compound 232 * operations, locks should be held for the entire compound operation, 233 * and that this is not yet done for relabel requests. 234 */ 235static struct mtx mac_policy_list_lock; 236static LIST_HEAD(, mac_policy_conf) mac_policy_list; 237static int mac_policy_list_busy; 238#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \ 239 "mac_policy_list_lock", NULL, MTX_DEF); 240#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock); 241#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock); 242 243#define MAC_POLICY_LIST_BUSY() do { \ 244 MAC_POLICY_LIST_LOCK(); \ 245 mac_policy_list_busy++; \ 246 MAC_POLICY_LIST_UNLOCK(); \ 247} while (0) 248 249#define MAC_POLICY_LIST_UNBUSY() do { \ 250 MAC_POLICY_LIST_LOCK(); \ 251 mac_policy_list_busy--; \ 252 if (mac_policy_list_busy < 0) \ 253 panic("Extra mac_policy_list_busy--"); \ 254 MAC_POLICY_LIST_UNLOCK(); \ 255} while (0) 256 257/* 258 * MAC_CHECK performs the designated check by walking the policy 259 * module list and checking with each as to how it feels about the 260 * request. Note that it returns its value via 'error' in the scope 261 * of the caller. 262 */ 263#define MAC_CHECK(check, args...) do { \ 264 struct mac_policy_conf *mpc; \ 265 \ 266 error = 0; \ 267 MAC_POLICY_LIST_BUSY(); \ 268 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 269 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 270 error = error_select( \ 271 mpc->mpc_ops->mpo_ ## check (args), \ 272 error); \ 273 } \ 274 MAC_POLICY_LIST_UNBUSY(); \ 275} while (0) 276 277/* 278 * MAC_BOOLEAN performs the designated boolean composition by walking 279 * the module list, invoking each instance of the operation, and 280 * combining the results using the passed C operator. Note that it 281 * returns its value via 'result' in the scope of the caller, which 282 * should be initialized by the caller in a meaningful way to get 283 * a meaningful result. 284 */ 285#define MAC_BOOLEAN(operation, composition, args...) do { \ 286 struct mac_policy_conf *mpc; \ 287 \ 288 MAC_POLICY_LIST_BUSY(); \ 289 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 290 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 291 result = result composition \ 292 mpc->mpc_ops->mpo_ ## operation (args); \ 293 } \ 294 MAC_POLICY_LIST_UNBUSY(); \ 295} while (0) 296 297/* 298 * MAC_PERFORM performs the designated operation by walking the policy 299 * module list and invoking that operation for each policy. 300 */ 301#define MAC_PERFORM(operation, args...) do { \ 302 struct mac_policy_conf *mpc; \ 303 \ 304 MAC_POLICY_LIST_BUSY(); \ 305 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 306 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 307 mpc->mpc_ops->mpo_ ## operation (args); \ 308 } \ 309 MAC_POLICY_LIST_UNBUSY(); \ 310} while (0) 311 312/* 313 * Initialize the MAC subsystem, including appropriate SMP locks. 314 */ 315static void 316mac_init(void) 317{ 318 319 LIST_INIT(&mac_policy_list); 320 MAC_POLICY_LIST_LOCKINIT(); 321} 322 323/* 324 * For the purposes of modules that want to know if they were loaded 325 * "early", set the mac_late flag once we've processed modules either 326 * linked into the kernel, or loaded before the kernel startup. 327 */ 328static void 329mac_late_init(void) 330{ 331 332 mac_late = 1; 333} 334 335/* 336 * Allow MAC policy modules to register during boot, etc. 337 */ 338int 339mac_policy_modevent(module_t mod, int type, void *data) 340{ 341 struct mac_policy_conf *mpc; 342 int error; 343 344 error = 0; 345 mpc = (struct mac_policy_conf *) data; 346 347 switch (type) { 348 case MOD_LOAD: 349 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE && 350 mac_late) { 351 printf("mac_policy_modevent: can't load %s policy " 352 "after booting\n", mpc->mpc_name); 353 error = EBUSY; 354 break; 355 } 356 error = mac_policy_register(mpc); 357 break; 358 case MOD_UNLOAD: 359 /* Don't unregister the module if it was never registered. */ 360 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) 361 != 0) 362 error = mac_policy_unregister(mpc); 363 else 364 error = 0; 365 break; 366 default: 367 break; 368 } 369 370 return (error); 371} 372 373static int 374mac_policy_register(struct mac_policy_conf *mpc) 375{ 376 struct mac_policy_conf *tmpc; 377 struct mac_policy_op_entry *mpe; 378 int slot; 379 380 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops), 381 M_MACOPVEC, M_WAITOK | M_ZERO); 382 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) { 383 switch (mpe->mpe_constant) { 384 case MAC_OP_LAST: 385 /* 386 * Doesn't actually happen, but this allows checking 387 * that all enumerated values are handled. 388 */ 389 break; 390 case MAC_DESTROY: 391 mpc->mpc_ops->mpo_destroy = 392 mpe->mpe_function; 393 break; 394 case MAC_INIT: 395 mpc->mpc_ops->mpo_init = 396 mpe->mpe_function; 397 break; 398 case MAC_SYSCALL: 399 mpc->mpc_ops->mpo_syscall = 400 mpe->mpe_function; 401 break; 402 case MAC_INIT_BPFDESC_LABEL: 403 mpc->mpc_ops->mpo_init_bpfdesc_label = 404 mpe->mpe_function; 405 break; 406 case MAC_INIT_CRED_LABEL: 407 mpc->mpc_ops->mpo_init_cred_label = 408 mpe->mpe_function; 409 break; 410 case MAC_INIT_DEVFSDIRENT_LABEL: 411 mpc->mpc_ops->mpo_init_devfsdirent_label = 412 mpe->mpe_function; 413 break; 414 case MAC_INIT_IFNET_LABEL: 415 mpc->mpc_ops->mpo_init_ifnet_label = 416 mpe->mpe_function; 417 break; 418 case MAC_INIT_IPQ_LABEL: 419 mpc->mpc_ops->mpo_init_ipq_label = 420 mpe->mpe_function; 421 break; 422 case MAC_INIT_MBUF_LABEL: 423 mpc->mpc_ops->mpo_init_mbuf_label = 424 mpe->mpe_function; 425 break; 426 case MAC_INIT_MOUNT_LABEL: 427 mpc->mpc_ops->mpo_init_mount_label = 428 mpe->mpe_function; 429 break; 430 case MAC_INIT_MOUNT_FS_LABEL: 431 mpc->mpc_ops->mpo_init_mount_fs_label = 432 mpe->mpe_function; 433 break; 434 case MAC_INIT_PIPE_LABEL: 435 mpc->mpc_ops->mpo_init_pipe_label = 436 mpe->mpe_function; 437 break; 438 case MAC_INIT_SOCKET_LABEL: 439 mpc->mpc_ops->mpo_init_socket_label = 440 mpe->mpe_function; 441 break; 442 case MAC_INIT_SOCKET_PEER_LABEL: 443 mpc->mpc_ops->mpo_init_socket_peer_label = 444 mpe->mpe_function; 445 break; 446 case MAC_INIT_TEMP_LABEL: 447 mpc->mpc_ops->mpo_init_temp_label = 448 mpe->mpe_function; 449 break; 450 case MAC_INIT_VNODE_LABEL: 451 mpc->mpc_ops->mpo_init_vnode_label = 452 mpe->mpe_function; 453 break; 454 case MAC_DESTROY_BPFDESC_LABEL: 455 mpc->mpc_ops->mpo_destroy_bpfdesc_label = 456 mpe->mpe_function; 457 break; 458 case MAC_DESTROY_CRED_LABEL: 459 mpc->mpc_ops->mpo_destroy_cred_label = 460 mpe->mpe_function; 461 break; 462 case MAC_DESTROY_DEVFSDIRENT_LABEL: 463 mpc->mpc_ops->mpo_destroy_devfsdirent_label = 464 mpe->mpe_function; 465 break; 466 case MAC_DESTROY_IFNET_LABEL: 467 mpc->mpc_ops->mpo_destroy_ifnet_label = 468 mpe->mpe_function; 469 break; 470 case MAC_DESTROY_IPQ_LABEL: 471 mpc->mpc_ops->mpo_destroy_ipq_label = 472 mpe->mpe_function; 473 break; 474 case MAC_DESTROY_MBUF_LABEL: 475 mpc->mpc_ops->mpo_destroy_mbuf_label = 476 mpe->mpe_function; 477 break; 478 case MAC_DESTROY_MOUNT_LABEL: 479 mpc->mpc_ops->mpo_destroy_mount_label = 480 mpe->mpe_function; 481 break; 482 case MAC_DESTROY_MOUNT_FS_LABEL: 483 mpc->mpc_ops->mpo_destroy_mount_fs_label = 484 mpe->mpe_function; 485 break; 486 case MAC_DESTROY_PIPE_LABEL: 487 mpc->mpc_ops->mpo_destroy_pipe_label = 488 mpe->mpe_function; 489 break; 490 case MAC_DESTROY_SOCKET_LABEL: 491 mpc->mpc_ops->mpo_destroy_socket_label = 492 mpe->mpe_function; 493 break; 494 case MAC_DESTROY_SOCKET_PEER_LABEL: 495 mpc->mpc_ops->mpo_destroy_socket_peer_label = 496 mpe->mpe_function; 497 break; 498 case MAC_DESTROY_TEMP_LABEL: 499 mpc->mpc_ops->mpo_destroy_temp_label = 500 mpe->mpe_function; 501 break; 502 case MAC_DESTROY_VNODE_LABEL: 503 mpc->mpc_ops->mpo_destroy_vnode_label = 504 mpe->mpe_function; 505 break; 506 case MAC_EXTERNALIZE: 507 mpc->mpc_ops->mpo_externalize = 508 mpe->mpe_function; 509 break; 510 case MAC_INTERNALIZE: 511 mpc->mpc_ops->mpo_internalize = 512 mpe->mpe_function; 513 break; 514 case MAC_CREATE_DEVFS_DEVICE: 515 mpc->mpc_ops->mpo_create_devfs_device = 516 mpe->mpe_function; 517 break; 518 case MAC_CREATE_DEVFS_DIRECTORY: 519 mpc->mpc_ops->mpo_create_devfs_directory = 520 mpe->mpe_function; 521 break; 522 case MAC_CREATE_DEVFS_SYMLINK: 523 mpc->mpc_ops->mpo_create_devfs_symlink = 524 mpe->mpe_function; 525 break; 526 case MAC_CREATE_DEVFS_VNODE: 527 mpc->mpc_ops->mpo_create_devfs_vnode = 528 mpe->mpe_function; 529 break; 530 case MAC_STDCREATEVNODE_EA: 531 mpc->mpc_ops->mpo_stdcreatevnode_ea = 532 mpe->mpe_function; 533 break; 534 case MAC_CREATE_VNODE: 535 mpc->mpc_ops->mpo_create_vnode = 536 mpe->mpe_function; 537 break; 538 case MAC_CREATE_MOUNT: 539 mpc->mpc_ops->mpo_create_mount = 540 mpe->mpe_function; 541 break; 542 case MAC_CREATE_ROOT_MOUNT: 543 mpc->mpc_ops->mpo_create_root_mount = 544 mpe->mpe_function; 545 break; 546 case MAC_RELABEL_VNODE: 547 mpc->mpc_ops->mpo_relabel_vnode = 548 mpe->mpe_function; 549 break; 550 case MAC_UPDATE_DEVFSDIRENT: 551 mpc->mpc_ops->mpo_update_devfsdirent = 552 mpe->mpe_function; 553 break; 554 case MAC_UPDATE_PROCFSVNODE: 555 mpc->mpc_ops->mpo_update_procfsvnode = 556 mpe->mpe_function; 557 break; 558 case MAC_UPDATE_VNODE_FROM_EXTATTR: 559 mpc->mpc_ops->mpo_update_vnode_from_extattr = 560 mpe->mpe_function; 561 break; 562 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED: 563 mpc->mpc_ops->mpo_update_vnode_from_externalized = 564 mpe->mpe_function; 565 break; 566 case MAC_UPDATE_VNODE_FROM_MOUNT: 567 mpc->mpc_ops->mpo_update_vnode_from_mount = 568 mpe->mpe_function; 569 break; 570 case MAC_CREATE_MBUF_FROM_SOCKET: 571 mpc->mpc_ops->mpo_create_mbuf_from_socket = 572 mpe->mpe_function; 573 break; 574 case MAC_CREATE_PIPE: 575 mpc->mpc_ops->mpo_create_pipe = 576 mpe->mpe_function; 577 break; 578 case MAC_CREATE_SOCKET: 579 mpc->mpc_ops->mpo_create_socket = 580 mpe->mpe_function; 581 break; 582 case MAC_CREATE_SOCKET_FROM_SOCKET: 583 mpc->mpc_ops->mpo_create_socket_from_socket = 584 mpe->mpe_function; 585 break; 586 case MAC_RELABEL_PIPE: 587 mpc->mpc_ops->mpo_relabel_pipe = 588 mpe->mpe_function; 589 break; 590 case MAC_RELABEL_SOCKET: 591 mpc->mpc_ops->mpo_relabel_socket = 592 mpe->mpe_function; 593 break; 594 case MAC_SET_SOCKET_PEER_FROM_MBUF: 595 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf = 596 mpe->mpe_function; 597 break; 598 case MAC_SET_SOCKET_PEER_FROM_SOCKET: 599 mpc->mpc_ops->mpo_set_socket_peer_from_socket = 600 mpe->mpe_function; 601 break; 602 case MAC_CREATE_BPFDESC: 603 mpc->mpc_ops->mpo_create_bpfdesc = 604 mpe->mpe_function; 605 break; 606 case MAC_CREATE_DATAGRAM_FROM_IPQ: 607 mpc->mpc_ops->mpo_create_datagram_from_ipq = 608 mpe->mpe_function; 609 break; 610 case MAC_CREATE_FRAGMENT: 611 mpc->mpc_ops->mpo_create_fragment = 612 mpe->mpe_function; 613 break; 614 case MAC_CREATE_IFNET: 615 mpc->mpc_ops->mpo_create_ifnet = 616 mpe->mpe_function; 617 break; 618 case MAC_CREATE_IPQ: 619 mpc->mpc_ops->mpo_create_ipq = 620 mpe->mpe_function; 621 break; 622 case MAC_CREATE_MBUF_FROM_MBUF: 623 mpc->mpc_ops->mpo_create_mbuf_from_mbuf = 624 mpe->mpe_function; 625 break; 626 case MAC_CREATE_MBUF_LINKLAYER: 627 mpc->mpc_ops->mpo_create_mbuf_linklayer = 628 mpe->mpe_function; 629 break; 630 case MAC_CREATE_MBUF_FROM_BPFDESC: 631 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc = 632 mpe->mpe_function; 633 break; 634 case MAC_CREATE_MBUF_FROM_IFNET: 635 mpc->mpc_ops->mpo_create_mbuf_from_ifnet = 636 mpe->mpe_function; 637 break; 638 case MAC_CREATE_MBUF_MULTICAST_ENCAP: 639 mpc->mpc_ops->mpo_create_mbuf_multicast_encap = 640 mpe->mpe_function; 641 break; 642 case MAC_CREATE_MBUF_NETLAYER: 643 mpc->mpc_ops->mpo_create_mbuf_netlayer = 644 mpe->mpe_function; 645 break; 646 case MAC_FRAGMENT_MATCH: 647 mpc->mpc_ops->mpo_fragment_match = 648 mpe->mpe_function; 649 break; 650 case MAC_RELABEL_IFNET: 651 mpc->mpc_ops->mpo_relabel_ifnet = 652 mpe->mpe_function; 653 break; 654 case MAC_UPDATE_IPQ: 655 mpc->mpc_ops->mpo_update_ipq = 656 mpe->mpe_function; 657 break; 658 case MAC_CREATE_CRED: 659 mpc->mpc_ops->mpo_create_cred = 660 mpe->mpe_function; 661 break; 662 case MAC_EXECVE_TRANSITION: 663 mpc->mpc_ops->mpo_execve_transition = 664 mpe->mpe_function; 665 break; 666 case MAC_EXECVE_WILL_TRANSITION: 667 mpc->mpc_ops->mpo_execve_will_transition = 668 mpe->mpe_function; 669 break; 670 case MAC_CREATE_PROC0: 671 mpc->mpc_ops->mpo_create_proc0 = 672 mpe->mpe_function; 673 break; 674 case MAC_CREATE_PROC1: 675 mpc->mpc_ops->mpo_create_proc1 = 676 mpe->mpe_function; 677 break; 678 case MAC_RELABEL_CRED: 679 mpc->mpc_ops->mpo_relabel_cred = 680 mpe->mpe_function; 681 break; 682 case MAC_THREAD_USERRET: 683 mpc->mpc_ops->mpo_thread_userret = 684 mpe->mpe_function; 685 break; 686 case MAC_CHECK_BPFDESC_RECEIVE: 687 mpc->mpc_ops->mpo_check_bpfdesc_receive = 688 mpe->mpe_function; 689 break; 690 case MAC_CHECK_CRED_RELABEL: 691 mpc->mpc_ops->mpo_check_cred_relabel = 692 mpe->mpe_function; 693 break; 694 case MAC_CHECK_CRED_VISIBLE: 695 mpc->mpc_ops->mpo_check_cred_visible = 696 mpe->mpe_function; 697 break; 698 case MAC_CHECK_IFNET_RELABEL: 699 mpc->mpc_ops->mpo_check_ifnet_relabel = 700 mpe->mpe_function; 701 break; 702 case MAC_CHECK_IFNET_TRANSMIT: 703 mpc->mpc_ops->mpo_check_ifnet_transmit = 704 mpe->mpe_function; 705 break; 706 case MAC_CHECK_MOUNT_STAT: 707 mpc->mpc_ops->mpo_check_mount_stat = 708 mpe->mpe_function; 709 break; 710 case MAC_CHECK_PIPE_IOCTL: 711 mpc->mpc_ops->mpo_check_pipe_ioctl = 712 mpe->mpe_function; 713 break; 714 case MAC_CHECK_PIPE_POLL: 715 mpc->mpc_ops->mpo_check_pipe_poll = 716 mpe->mpe_function; 717 break; 718 case MAC_CHECK_PIPE_READ: 719 mpc->mpc_ops->mpo_check_pipe_read = 720 mpe->mpe_function; 721 break; 722 case MAC_CHECK_PIPE_RELABEL: 723 mpc->mpc_ops->mpo_check_pipe_relabel = 724 mpe->mpe_function; 725 break; 726 case MAC_CHECK_PIPE_STAT: 727 mpc->mpc_ops->mpo_check_pipe_stat = 728 mpe->mpe_function; 729 break; 730 case MAC_CHECK_PIPE_WRITE: 731 mpc->mpc_ops->mpo_check_pipe_write = 732 mpe->mpe_function; 733 break; 734 case MAC_CHECK_PROC_DEBUG: 735 mpc->mpc_ops->mpo_check_proc_debug = 736 mpe->mpe_function; 737 break; 738 case MAC_CHECK_PROC_SCHED: 739 mpc->mpc_ops->mpo_check_proc_sched = 740 mpe->mpe_function; 741 break; 742 case MAC_CHECK_PROC_SIGNAL: 743 mpc->mpc_ops->mpo_check_proc_signal = 744 mpe->mpe_function; 745 break; 746 case MAC_CHECK_SOCKET_BIND: 747 mpc->mpc_ops->mpo_check_socket_bind = 748 mpe->mpe_function; 749 break; 750 case MAC_CHECK_SOCKET_CONNECT: 751 mpc->mpc_ops->mpo_check_socket_connect = 752 mpe->mpe_function; 753 break; 754 case MAC_CHECK_SOCKET_DELIVER: 755 mpc->mpc_ops->mpo_check_socket_deliver = 756 mpe->mpe_function; 757 break; 758 case MAC_CHECK_SOCKET_LISTEN: 759 mpc->mpc_ops->mpo_check_socket_listen = 760 mpe->mpe_function; 761 break; 762 case MAC_CHECK_SOCKET_RECEIVE: 763 mpc->mpc_ops->mpo_check_socket_receive = 764 mpe->mpe_function; 765 break; 766 case MAC_CHECK_SOCKET_RELABEL: 767 mpc->mpc_ops->mpo_check_socket_relabel = 768 mpe->mpe_function; 769 break; 770 case MAC_CHECK_SOCKET_SEND: 771 mpc->mpc_ops->mpo_check_socket_send = 772 mpe->mpe_function; 773 break; 774 case MAC_CHECK_SOCKET_VISIBLE: 775 mpc->mpc_ops->mpo_check_socket_visible = 776 mpe->mpe_function; 777 break; 778 case MAC_CHECK_VNODE_ACCESS: 779 mpc->mpc_ops->mpo_check_vnode_access = 780 mpe->mpe_function; 781 break; 782 case MAC_CHECK_VNODE_CHDIR: 783 mpc->mpc_ops->mpo_check_vnode_chdir = 784 mpe->mpe_function; 785 break; 786 case MAC_CHECK_VNODE_CHROOT: 787 mpc->mpc_ops->mpo_check_vnode_chroot = 788 mpe->mpe_function; 789 break; 790 case MAC_CHECK_VNODE_CREATE: 791 mpc->mpc_ops->mpo_check_vnode_create = 792 mpe->mpe_function; 793 break; 794 case MAC_CHECK_VNODE_DELETE: 795 mpc->mpc_ops->mpo_check_vnode_delete = 796 mpe->mpe_function; 797 break; 798 case MAC_CHECK_VNODE_DELETEACL: 799 mpc->mpc_ops->mpo_check_vnode_deleteacl = 800 mpe->mpe_function; 801 break; 802 case MAC_CHECK_VNODE_EXEC: 803 mpc->mpc_ops->mpo_check_vnode_exec = 804 mpe->mpe_function; 805 break; 806 case MAC_CHECK_VNODE_GETACL: 807 mpc->mpc_ops->mpo_check_vnode_getacl = 808 mpe->mpe_function; 809 break; 810 case MAC_CHECK_VNODE_GETEXTATTR: 811 mpc->mpc_ops->mpo_check_vnode_getextattr = 812 mpe->mpe_function; 813 break; 814 case MAC_CHECK_VNODE_LINK: 815 mpc->mpc_ops->mpo_check_vnode_link = 816 mpe->mpe_function; 817 break; 818 case MAC_CHECK_VNODE_LOOKUP: 819 mpc->mpc_ops->mpo_check_vnode_lookup = 820 mpe->mpe_function; 821 break; 822 case MAC_CHECK_VNODE_MMAP: 823 mpc->mpc_ops->mpo_check_vnode_mmap = 824 mpe->mpe_function; 825 break; 826 case MAC_CHECK_VNODE_MMAP_DOWNGRADE: 827 mpc->mpc_ops->mpo_check_vnode_mmap_downgrade = 828 mpe->mpe_function; 829 break; 830 case MAC_CHECK_VNODE_MPROTECT: 831 mpc->mpc_ops->mpo_check_vnode_mprotect = 832 mpe->mpe_function; 833 break; 834 case MAC_CHECK_VNODE_OPEN: 835 mpc->mpc_ops->mpo_check_vnode_open = 836 mpe->mpe_function; 837 break; 838 case MAC_CHECK_VNODE_POLL: 839 mpc->mpc_ops->mpo_check_vnode_poll = 840 mpe->mpe_function; 841 break; 842 case MAC_CHECK_VNODE_READ: 843 mpc->mpc_ops->mpo_check_vnode_read = 844 mpe->mpe_function; 845 break; 846 case MAC_CHECK_VNODE_READDIR: 847 mpc->mpc_ops->mpo_check_vnode_readdir = 848 mpe->mpe_function; 849 break; 850 case MAC_CHECK_VNODE_READLINK: 851 mpc->mpc_ops->mpo_check_vnode_readlink = 852 mpe->mpe_function; 853 break; 854 case MAC_CHECK_VNODE_RELABEL: 855 mpc->mpc_ops->mpo_check_vnode_relabel = 856 mpe->mpe_function; 857 break; 858 case MAC_CHECK_VNODE_RENAME_FROM: 859 mpc->mpc_ops->mpo_check_vnode_rename_from = 860 mpe->mpe_function; 861 break; 862 case MAC_CHECK_VNODE_RENAME_TO: 863 mpc->mpc_ops->mpo_check_vnode_rename_to = 864 mpe->mpe_function; 865 break; 866 case MAC_CHECK_VNODE_REVOKE: 867 mpc->mpc_ops->mpo_check_vnode_revoke = 868 mpe->mpe_function; 869 break; 870 case MAC_CHECK_VNODE_SETACL: 871 mpc->mpc_ops->mpo_check_vnode_setacl = 872 mpe->mpe_function; 873 break; 874 case MAC_CHECK_VNODE_SETEXTATTR: 875 mpc->mpc_ops->mpo_check_vnode_setextattr = 876 mpe->mpe_function; 877 break; 878 case MAC_CHECK_VNODE_SETFLAGS: 879 mpc->mpc_ops->mpo_check_vnode_setflags = 880 mpe->mpe_function; 881 break; 882 case MAC_CHECK_VNODE_SETMODE: 883 mpc->mpc_ops->mpo_check_vnode_setmode = 884 mpe->mpe_function; 885 break; 886 case MAC_CHECK_VNODE_SETOWNER: 887 mpc->mpc_ops->mpo_check_vnode_setowner = 888 mpe->mpe_function; 889 break; 890 case MAC_CHECK_VNODE_SETUTIMES: 891 mpc->mpc_ops->mpo_check_vnode_setutimes = 892 mpe->mpe_function; 893 break; 894 case MAC_CHECK_VNODE_STAT: 895 mpc->mpc_ops->mpo_check_vnode_stat = 896 mpe->mpe_function; 897 break; 898 case MAC_CHECK_VNODE_WRITE: 899 mpc->mpc_ops->mpo_check_vnode_write = 900 mpe->mpe_function; 901 break; 902/* 903 default: 904 printf("MAC policy `%s': unknown operation %d\n", 905 mpc->mpc_name, mpe->mpe_constant); 906 return (EINVAL); 907*/ 908 } 909 } 910 MAC_POLICY_LIST_LOCK(); 911 if (mac_policy_list_busy > 0) { 912 MAC_POLICY_LIST_UNLOCK(); 913 FREE(mpc->mpc_ops, M_MACOPVEC); 914 mpc->mpc_ops = NULL; 915 return (EBUSY); 916 } 917 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { 918 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { 919 MAC_POLICY_LIST_UNLOCK(); 920 FREE(mpc->mpc_ops, M_MACOPVEC); 921 mpc->mpc_ops = NULL; 922 return (EEXIST); 923 } 924 } 925 if (mpc->mpc_field_off != NULL) { 926 slot = ffs(mac_policy_offsets_free); 927 if (slot == 0) { 928 MAC_POLICY_LIST_UNLOCK(); 929 FREE(mpc->mpc_ops, M_MACOPVEC); 930 mpc->mpc_ops = NULL; 931 return (ENOMEM); 932 } 933 slot--; 934 mac_policy_offsets_free &= ~(1 << slot); 935 *mpc->mpc_field_off = slot; 936 } 937 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED; 938 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list); 939 940 /* Per-policy initialization. */ 941 if (mpc->mpc_ops->mpo_init != NULL) 942 (*(mpc->mpc_ops->mpo_init))(mpc); 943 MAC_POLICY_LIST_UNLOCK(); 944 945 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname, 946 mpc->mpc_name); 947 948 return (0); 949} 950 951static int 952mac_policy_unregister(struct mac_policy_conf *mpc) 953{ 954 955 /* 956 * If we fail the load, we may get a request to unload. Check 957 * to see if we did the run-time registration, and if not, 958 * silently succeed. 959 */ 960 MAC_POLICY_LIST_LOCK(); 961 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) { 962 MAC_POLICY_LIST_UNLOCK(); 963 return (0); 964 } 965#if 0 966 /* 967 * Don't allow unloading modules with private data. 968 */ 969 if (mpc->mpc_field_off != NULL) { 970 MAC_POLICY_LIST_UNLOCK(); 971 return (EBUSY); 972 } 973#endif 974 /* 975 * Only allow the unload to proceed if the module is unloadable 976 * by its own definition. 977 */ 978 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) { 979 MAC_POLICY_LIST_UNLOCK(); 980 return (EBUSY); 981 } 982 /* 983 * Right now, we EBUSY if the list is in use. In the future, 984 * for reliability reasons, we might want to sleep and wakeup 985 * later to try again. 986 */ 987 if (mac_policy_list_busy > 0) { 988 MAC_POLICY_LIST_UNLOCK(); 989 return (EBUSY); 990 } 991 if (mpc->mpc_ops->mpo_destroy != NULL) 992 (*(mpc->mpc_ops->mpo_destroy))(mpc); 993 994 LIST_REMOVE(mpc, mpc_list); 995 MAC_POLICY_LIST_UNLOCK(); 996 997 FREE(mpc->mpc_ops, M_MACOPVEC); 998 mpc->mpc_ops = NULL; 999 mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED; 1000 1001 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname, 1002 mpc->mpc_name); 1003 1004 return (0); 1005} 1006 1007/* 1008 * Define an error value precedence, and given two arguments, selects the 1009 * value with the higher precedence. 1010 */ 1011static int 1012error_select(int error1, int error2) 1013{ 1014 1015 /* Certain decision-making errors take top priority. */ 1016 if (error1 == EDEADLK || error2 == EDEADLK) 1017 return (EDEADLK); 1018 1019 /* Invalid arguments should be reported where possible. */ 1020 if (error1 == EINVAL || error2 == EINVAL) 1021 return (EINVAL); 1022 1023 /* Precedence goes to "visibility", with both process and file. */ 1024 if (error1 == ESRCH || error2 == ESRCH) 1025 return (ESRCH); 1026 1027 if (error1 == ENOENT || error2 == ENOENT) 1028 return (ENOENT); 1029 1030 /* Precedence goes to DAC/MAC protections. */ 1031 if (error1 == EACCES || error2 == EACCES) 1032 return (EACCES); 1033 1034 /* Precedence goes to privilege. */ 1035 if (error1 == EPERM || error2 == EPERM) 1036 return (EPERM); 1037 1038 /* Precedence goes to error over success; otherwise, arbitrary. */ 1039 if (error1 != 0) 1040 return (error1); 1041 return (error2); 1042} 1043 1044static void 1045mac_init_label(struct label *label) 1046{ 1047 1048 bzero(label, sizeof(*label)); 1049 label->l_flags = MAC_FLAG_INITIALIZED; 1050} 1051 1052static void 1053mac_destroy_label(struct label *label) 1054{ 1055 1056 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED, 1057 ("destroying uninitialized label")); 1058 1059 bzero(label, sizeof(*label)); 1060 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */ 1061} 1062 1063static void 1064mac_init_structmac(struct mac *mac) 1065{ 1066 1067 bzero(mac, sizeof(*mac)); 1068 mac->m_macflags = MAC_FLAG_INITIALIZED; 1069} 1070 1071void 1072mac_init_bpfdesc(struct bpf_d *bpf_d) 1073{ 1074 1075 mac_init_label(&bpf_d->bd_label); 1076 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label); 1077#ifdef MAC_DEBUG 1078 atomic_add_int(&nmacbpfdescs, 1); 1079#endif 1080} 1081 1082void 1083mac_init_cred(struct ucred *cr) 1084{ 1085 1086 mac_init_label(&cr->cr_label); 1087 MAC_PERFORM(init_cred_label, &cr->cr_label); 1088#ifdef MAC_DEBUG 1089 atomic_add_int(&nmaccreds, 1); 1090#endif 1091} 1092 1093void 1094mac_init_devfsdirent(struct devfs_dirent *de) 1095{ 1096 1097 mac_init_label(&de->de_label); 1098 MAC_PERFORM(init_devfsdirent_label, &de->de_label); 1099#ifdef MAC_DEBUG 1100 atomic_add_int(&nmacdevfsdirents, 1); 1101#endif 1102} 1103 1104void 1105mac_init_ifnet(struct ifnet *ifp) 1106{ 1107 1108 mac_init_label(&ifp->if_label); 1109 MAC_PERFORM(init_ifnet_label, &ifp->if_label); 1110#ifdef MAC_DEBUG 1111 atomic_add_int(&nmacifnets, 1); 1112#endif 1113} 1114 1115void 1116mac_init_ipq(struct ipq *ipq) 1117{ 1118 1119 mac_init_label(&ipq->ipq_label); 1120 MAC_PERFORM(init_ipq_label, &ipq->ipq_label); 1121#ifdef MAC_DEBUG 1122 atomic_add_int(&nmacipqs, 1); 1123#endif 1124} 1125 1126int 1127mac_init_mbuf(struct mbuf *m, int flag) 1128{ 1129 int error; 1130 1131 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf")); 1132 1133 mac_init_label(&m->m_pkthdr.label); 1134 1135 MAC_CHECK(init_mbuf_label, &m->m_pkthdr.label, flag); 1136 if (error) { 1137 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label); 1138 mac_destroy_label(&m->m_pkthdr.label); 1139 } 1140 1141#ifdef MAC_DEBUG 1142 if (error == 0) 1143 atomic_add_int(&nmacmbufs, 1); 1144#endif 1145 return (error); 1146} 1147 1148void 1149mac_init_mount(struct mount *mp) 1150{ 1151 1152 mac_init_label(&mp->mnt_mntlabel); 1153 mac_init_label(&mp->mnt_fslabel); 1154 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel); 1155 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel); 1156#ifdef MAC_DEBUG 1157 atomic_add_int(&nmacmounts, 1); 1158#endif 1159} 1160 1161void 1162mac_init_pipe(struct pipe *pipe) 1163{ 1164 struct label *label; 1165 1166 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK); 1167 mac_init_label(label); 1168 pipe->pipe_label = label; 1169 pipe->pipe_peer->pipe_label = label; 1170 MAC_PERFORM(init_pipe_label, pipe->pipe_label); 1171#ifdef MAC_DEBUG 1172 atomic_add_int(&nmacpipes, 1); 1173#endif 1174} 1175 1176static int 1177mac_init_socket_label(struct label *label, int flag) 1178{ 1179 int error; 1180 1181 mac_init_label(label); 1182 1183 MAC_CHECK(init_socket_label, label, flag); 1184 if (error) { 1185 MAC_PERFORM(destroy_socket_label, label); 1186 mac_destroy_label(label); 1187 } 1188 1189#ifdef MAC_DEBUG 1190 if (error == 0) 1191 atomic_add_int(&nmacsockets, 1); 1192#endif 1193 1194 return (error); 1195} 1196 1197static int 1198mac_init_socket_peer_label(struct label *label, int flag) 1199{ 1200 int error; 1201 1202 mac_init_label(label); 1203 1204 MAC_CHECK(init_socket_peer_label, label, flag); 1205 if (error) { 1206 MAC_PERFORM(destroy_socket_label, label); 1207 mac_destroy_label(label); 1208 } 1209 1210 return (error); 1211} 1212 1213int 1214mac_init_socket(struct socket *socket, int flag) 1215{ 1216 int error; 1217 1218 error = mac_init_socket_label(&socket->so_label, flag); 1219 if (error) 1220 return (error); 1221 1222 error = mac_init_socket_peer_label(&socket->so_peerlabel, flag); 1223 if (error) 1224 mac_destroy_socket_label(&socket->so_label); 1225 1226 return (error); 1227} 1228 1229static void 1230mac_init_temp(struct label *label) 1231{ 1232 1233 mac_init_label(label); 1234 MAC_PERFORM(init_temp_label, label); 1235#ifdef MAC_DEBUG 1236 atomic_add_int(&nmactemp, 1); 1237#endif 1238} 1239 1240void 1241mac_init_vnode(struct vnode *vp) 1242{ 1243 1244 mac_init_label(&vp->v_label); 1245 MAC_PERFORM(init_vnode_label, &vp->v_label); 1246#ifdef MAC_DEBUG 1247 atomic_add_int(&nmacvnodes, 1); 1248#endif 1249} 1250 1251void 1252mac_destroy_bpfdesc(struct bpf_d *bpf_d) 1253{ 1254 1255 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label); 1256 mac_destroy_label(&bpf_d->bd_label); 1257#ifdef MAC_DEBUG 1258 atomic_subtract_int(&nmacbpfdescs, 1); 1259#endif 1260} 1261 1262void 1263mac_destroy_cred(struct ucred *cr) 1264{ 1265 1266 MAC_PERFORM(destroy_cred_label, &cr->cr_label); 1267 mac_destroy_label(&cr->cr_label); 1268#ifdef MAC_DEBUG 1269 atomic_subtract_int(&nmaccreds, 1); 1270#endif 1271} 1272 1273void 1274mac_destroy_devfsdirent(struct devfs_dirent *de) 1275{ 1276 1277 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label); 1278 mac_destroy_label(&de->de_label); 1279#ifdef MAC_DEBUG 1280 atomic_subtract_int(&nmacdevfsdirents, 1); 1281#endif 1282} 1283 1284void 1285mac_destroy_ifnet(struct ifnet *ifp) 1286{ 1287 1288 MAC_PERFORM(destroy_ifnet_label, &ifp->if_label); 1289 mac_destroy_label(&ifp->if_label); 1290#ifdef MAC_DEBUG 1291 atomic_subtract_int(&nmacifnets, 1); 1292#endif 1293} 1294 1295void 1296mac_destroy_ipq(struct ipq *ipq) 1297{ 1298 1299 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label); 1300 mac_destroy_label(&ipq->ipq_label); 1301#ifdef MAC_DEBUG 1302 atomic_subtract_int(&nmacipqs, 1); 1303#endif 1304} 1305 1306void 1307mac_destroy_mbuf(struct mbuf *m) 1308{ 1309 1310 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label); 1311 mac_destroy_label(&m->m_pkthdr.label); 1312#ifdef MAC_DEBUG 1313 atomic_subtract_int(&nmacmbufs, 1); 1314#endif 1315} 1316 1317void 1318mac_destroy_mount(struct mount *mp) 1319{ 1320 1321 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel); 1322 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel); 1323 mac_destroy_label(&mp->mnt_fslabel); 1324 mac_destroy_label(&mp->mnt_mntlabel); 1325#ifdef MAC_DEBUG 1326 atomic_subtract_int(&nmacmounts, 1); 1327#endif 1328} 1329 1330void 1331mac_destroy_pipe(struct pipe *pipe) 1332{ 1333 1334 MAC_PERFORM(destroy_pipe_label, pipe->pipe_label); 1335 mac_destroy_label(pipe->pipe_label); 1336 free(pipe->pipe_label, M_MACPIPELABEL); 1337#ifdef MAC_DEBUG 1338 atomic_subtract_int(&nmacpipes, 1); 1339#endif 1340} 1341 1342static void 1343mac_destroy_socket_label(struct label *label) 1344{ 1345 1346 MAC_PERFORM(destroy_socket_label, label); 1347 mac_destroy_label(label); 1348#ifdef MAC_DEBUG 1349 atomic_subtract_int(&nmacsockets, 1); 1350#endif 1351} 1352 1353static void 1354mac_destroy_socket_peer_label(struct label *label) 1355{ 1356 1357 MAC_PERFORM(destroy_socket_peer_label, label); 1358 mac_destroy_label(label); 1359} 1360 1361void 1362mac_destroy_socket(struct socket *socket) 1363{ 1364 1365 mac_destroy_socket_label(&socket->so_label); 1366 mac_destroy_socket_peer_label(&socket->so_peerlabel); 1367} 1368 1369static void 1370mac_destroy_temp(struct label *label) 1371{ 1372 1373 MAC_PERFORM(destroy_temp_label, label); 1374 mac_destroy_label(label); 1375#ifdef MAC_DEBUG 1376 atomic_subtract_int(&nmactemp, 1); 1377#endif 1378} 1379 1380void 1381mac_destroy_vnode(struct vnode *vp) 1382{ 1383 1384 MAC_PERFORM(destroy_vnode_label, &vp->v_label); 1385 mac_destroy_label(&vp->v_label); 1386#ifdef MAC_DEBUG 1387 atomic_subtract_int(&nmacvnodes, 1); 1388#endif 1389} 1390 1391static int 1392mac_externalize(struct label *label, struct mac *mac) 1393{ 1394 int error; 1395 1396 mac_init_structmac(mac); 1397 MAC_CHECK(externalize, label, mac); 1398 1399 return (error); 1400} 1401 1402static int 1403mac_internalize(struct label *label, struct mac *mac) 1404{ 1405 int error; 1406 1407 mac_init_temp(label); 1408 MAC_CHECK(internalize, label, mac); 1409 if (error) 1410 mac_destroy_temp(label); 1411 1412 return (error); 1413} 1414 1415/* 1416 * Initialize MAC label for the first kernel process, from which other 1417 * kernel processes and threads are spawned. 1418 */ 1419void 1420mac_create_proc0(struct ucred *cred) 1421{ 1422 1423 MAC_PERFORM(create_proc0, cred); 1424} 1425 1426/* 1427 * Initialize MAC label for the first userland process, from which other 1428 * userland processes and threads are spawned. 1429 */ 1430void 1431mac_create_proc1(struct ucred *cred) 1432{ 1433 1434 MAC_PERFORM(create_proc1, cred); 1435} 1436 1437void 1438mac_thread_userret(struct thread *td) 1439{ 1440 1441 MAC_PERFORM(thread_userret, td); 1442} 1443 1444/* 1445 * When a new process is created, its label must be initialized. Generally, 1446 * this involves inheritence from the parent process, modulo possible 1447 * deltas. This function allows that processing to take place. 1448 */ 1449void 1450mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred) 1451{ 1452 1453 MAC_PERFORM(create_cred, parent_cred, child_cred); 1454} 1455 1456void 1457mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp) 1458{ 1459 1460 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label); 1461} 1462 1463void 1464mac_update_procfsvnode(struct vnode *vp, struct ucred *cred) 1465{ 1466 1467 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred); 1468} 1469 1470/* 1471 * Support callout for policies that manage their own externalization 1472 * using extended attributes. 1473 */ 1474static int 1475mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp) 1476{ 1477 int error; 1478 1479 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp, 1480 &mp->mnt_fslabel); 1481 1482 return (error); 1483} 1484 1485/* 1486 * Given an externalized mac label, internalize it and stamp it on a 1487 * vnode. 1488 */ 1489static int 1490mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac) 1491{ 1492 int error; 1493 1494 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac); 1495 1496 return (error); 1497} 1498 1499/* 1500 * Call out to individual policies to update the label in a vnode from 1501 * the mountpoint. 1502 */ 1503void 1504mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp) 1505{ 1506 1507 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp, 1508 &mp->mnt_fslabel); 1509 1510 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount"); 1511 if (mac_cache_fslabel_in_vnode) 1512 vp->v_vflag |= VV_CACHEDLABEL; 1513} 1514 1515/* 1516 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes 1517 * to store label data. Can be referenced by filesystems supporting 1518 * extended attributes. 1519 */ 1520int 1521vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap) 1522{ 1523 struct vnode *vp = ap->a_vp; 1524 struct mac extmac; 1525 int buflen, error; 1526 1527 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea"); 1528 1529 /* 1530 * Call out to external policies first. Order doesn't really 1531 * matter, as long as failure of one assures failure of all. 1532 */ 1533 error = mac_update_vnode_from_extattr(vp, vp->v_mount); 1534 if (error) 1535 return (error); 1536 1537 buflen = sizeof(extmac); 1538 error = vn_extattr_get(vp, IO_NODELOCKED, 1539 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen, 1540 (char *)&extmac, curthread); 1541 switch (error) { 1542 case 0: 1543 /* Got it */ 1544 break; 1545 1546 case ENOATTR: 1547 /* 1548 * Use the label from the mount point. 1549 */ 1550 mac_update_vnode_from_mount(vp, vp->v_mount); 1551 return (0); 1552 1553 case EOPNOTSUPP: 1554 default: 1555 /* Fail horribly. */ 1556 return (error); 1557 } 1558 1559 if (buflen != sizeof(extmac)) 1560 error = EPERM; /* Fail very closed. */ 1561 if (error == 0) 1562 error = mac_update_vnode_from_externalized(vp, &extmac); 1563 if (error == 0) 1564 vp->v_vflag |= VV_CACHEDLABEL; 1565 else { 1566 struct vattr va; 1567 1568 printf("Corrupted label on %s", 1569 vp->v_mount->mnt_stat.f_mntonname); 1570 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0) 1571 printf(" inum %ld", va.va_fileid); 1572#ifdef MAC_DEBUG 1573 if (mac_debug_label_fallback) { 1574 printf(", falling back.\n"); 1575 mac_update_vnode_from_mount(vp, vp->v_mount); 1576 error = 0; 1577 } else { 1578#endif 1579 printf(".\n"); 1580 error = EPERM; 1581#ifdef MAC_DEBUG 1582 } 1583#endif 1584 } 1585 1586 return (error); 1587} 1588 1589/* 1590 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle 1591 * the labeling activity outselves. Filesystems should be careful not 1592 * to change their minds regarding whether they support vop_refreshlabel() 1593 * for a vnode or not. Don't cache the vnode here, allow the file 1594 * system code to determine if it's safe to cache. If we update from 1595 * the mount, don't cache since a change to the mount label should affect 1596 * all vnodes. 1597 */ 1598static int 1599vn_refreshlabel(struct vnode *vp, struct ucred *cred) 1600{ 1601 int error; 1602 1603 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel"); 1604 1605 if (vp->v_mount == NULL) { 1606/* 1607 Eventually, we probably want to special-case refreshing 1608 of deadfs vnodes, and if there's a lock-free race somewhere, 1609 that case might be handled here. 1610 1611 mac_update_vnode_deadfs(vp); 1612 return (0); 1613 */ 1614 /* printf("vn_refreshlabel: null v_mount\n"); */ 1615 if (vp->v_type != VNON) 1616 printf( 1617 "vn_refreshlabel: null v_mount with non-VNON\n"); 1618 return (EBADF); 1619 } 1620 1621 if (vp->v_vflag & VV_CACHEDLABEL) { 1622 mac_vnode_label_cache_hits++; 1623 return (0); 1624 } else 1625 mac_vnode_label_cache_misses++; 1626 1627 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) { 1628 mac_update_vnode_from_mount(vp, vp->v_mount); 1629 return (0); 1630 } 1631 1632 error = VOP_REFRESHLABEL(vp, cred, curthread); 1633 switch (error) { 1634 case EOPNOTSUPP: 1635 /* 1636 * If labels are not supported on this vnode, fall back to 1637 * the label in the mount and propagate it to the vnode. 1638 * There should probably be some sort of policy/flag/decision 1639 * about doing this. 1640 */ 1641 mac_update_vnode_from_mount(vp, vp->v_mount); 1642 error = 0; 1643 default: 1644 return (error); 1645 } 1646} 1647 1648/* 1649 * Helper function for file systems using the vop_std*_ea() calls. This 1650 * function must be called after EA service is available for the vnode, 1651 * but before it's hooked up to the namespace so that the node persists 1652 * if there's a crash, or before it can be accessed. On successful 1653 * commit of the label to disk (etc), do cache the label. 1654 */ 1655int 1656vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred) 1657{ 1658 struct mac extmac; 1659 int error; 1660 1661 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea"); 1662 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) { 1663 mac_update_vnode_from_mount(tvp, tvp->v_mount); 1664 } else { 1665 error = vn_refreshlabel(dvp, cred); 1666 if (error) 1667 return (error); 1668 1669 /* 1670 * Stick the label in the vnode. Then try to write to 1671 * disk. If we fail, return a failure to abort the 1672 * create operation. Really, this failure shouldn't 1673 * happen except in fairly unusual circumstances (out 1674 * of disk, etc). 1675 */ 1676 mac_create_vnode(cred, dvp, tvp); 1677 1678 error = mac_stdcreatevnode_ea(tvp); 1679 if (error) 1680 return (error); 1681 1682 /* 1683 * XXX: Eventually this will go away and all policies will 1684 * directly manage their extended attributes. 1685 */ 1686 error = mac_externalize(&tvp->v_label, &extmac); 1687 if (error) 1688 return (error); 1689 1690 error = vn_extattr_set(tvp, IO_NODELOCKED, 1691 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, 1692 sizeof(extmac), (char *)&extmac, curthread); 1693 if (error == 0) 1694 tvp->v_vflag |= VV_CACHEDLABEL; 1695 else { 1696#if 0 1697 /* 1698 * In theory, we could have fall-back behavior here. 1699 * It would probably be incorrect. 1700 */ 1701#endif 1702 return (error); 1703 } 1704 } 1705 1706 return (0); 1707} 1708 1709void 1710mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp) 1711{ 1712 int error; 1713 1714 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 1715 1716 error = vn_refreshlabel(vp, old); 1717 if (error) { 1718 printf("mac_execve_transition: vn_refreshlabel returned %d\n", 1719 error); 1720 printf("mac_execve_transition: using old vnode label\n"); 1721 } 1722 1723 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label); 1724} 1725 1726int 1727mac_execve_will_transition(struct ucred *old, struct vnode *vp) 1728{ 1729 int error, result; 1730 1731 error = vn_refreshlabel(vp, old); 1732 if (error) 1733 return (error); 1734 1735 result = 0; 1736 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label); 1737 1738 return (result); 1739} 1740 1741int 1742mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags) 1743{ 1744 int error; 1745 1746 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 1747 1748 if (!mac_enforce_fs) 1749 return (0); 1750 1751 error = vn_refreshlabel(vp, cred); 1752 if (error) 1753 return (error); 1754 1755 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags); 1756 return (error); 1757} 1758 1759int 1760mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 1761{ 1762 int error; 1763 1764 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 1765 1766 if (!mac_enforce_fs) 1767 return (0); 1768 1769 error = vn_refreshlabel(dvp, cred); 1770 if (error) 1771 return (error); 1772 1773 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label); 1774 return (error); 1775} 1776 1777int 1778mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 1779{ 1780 int error; 1781 1782 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 1783 1784 if (!mac_enforce_fs) 1785 return (0); 1786 1787 error = vn_refreshlabel(dvp, cred); 1788 if (error) 1789 return (error); 1790 1791 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label); 1792 return (error); 1793} 1794 1795int 1796mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1797 struct componentname *cnp, struct vattr *vap) 1798{ 1799 int error; 1800 1801 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 1802 1803 if (!mac_enforce_fs) 1804 return (0); 1805 1806 error = vn_refreshlabel(dvp, cred); 1807 if (error) 1808 return (error); 1809 1810 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap); 1811 return (error); 1812} 1813 1814int 1815mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 1816 struct componentname *cnp) 1817{ 1818 int error; 1819 1820 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 1821 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 1822 1823 if (!mac_enforce_fs) 1824 return (0); 1825 1826 error = vn_refreshlabel(dvp, cred); 1827 if (error) 1828 return (error); 1829 error = vn_refreshlabel(vp, cred); 1830 if (error) 1831 return (error); 1832 1833 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp, 1834 &vp->v_label, cnp); 1835 return (error); 1836} 1837 1838int 1839mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1840 acl_type_t type) 1841{ 1842 int error; 1843 1844 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 1845 1846 if (!mac_enforce_fs) 1847 return (0); 1848 1849 error = vn_refreshlabel(vp, cred); 1850 if (error) 1851 return (error); 1852 1853 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type); 1854 return (error); 1855} 1856 1857int 1858mac_check_vnode_exec(struct ucred *cred, struct vnode *vp) 1859{ 1860 int error; 1861 1862 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 1863 1864 if (!mac_enforce_process && !mac_enforce_fs) 1865 return (0); 1866 1867 error = vn_refreshlabel(vp, cred); 1868 if (error) 1869 return (error); 1870 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label); 1871 1872 return (error); 1873} 1874 1875int 1876mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 1877{ 1878 int error; 1879 1880 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 1881 1882 if (!mac_enforce_fs) 1883 return (0); 1884 1885 error = vn_refreshlabel(vp, cred); 1886 if (error) 1887 return (error); 1888 1889 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); 1890 return (error); 1891} 1892 1893int 1894mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1895 int attrnamespace, const char *name, struct uio *uio) 1896{ 1897 int error; 1898 1899 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 1900 1901 if (!mac_enforce_fs) 1902 return (0); 1903 1904 error = vn_refreshlabel(vp, cred); 1905 if (error) 1906 return (error); 1907 1908 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, 1909 attrnamespace, name, uio); 1910 return (error); 1911} 1912 1913int 1914mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 1915 struct vnode *vp, struct componentname *cnp) 1916{ 1917 1918 int error; 1919 1920 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 1921 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 1922 1923 if (!mac_enforce_fs) 1924 return (0); 1925 1926 error = vn_refreshlabel(dvp, cred); 1927 if (error) 1928 return (error); 1929 1930 error = vn_refreshlabel(vp, cred); 1931 if (error) 1932 return (error); 1933 1934 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp, 1935 &vp->v_label, cnp); 1936 return (error); 1937} 1938 1939int 1940mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 1941 struct componentname *cnp) 1942{ 1943 int error; 1944 1945 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 1946 1947 if (!mac_enforce_fs) 1948 return (0); 1949 1950 error = vn_refreshlabel(dvp, cred); 1951 if (error) 1952 return (error); 1953 1954 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); 1955 return (error); 1956} 1957 1958int 1959mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot) 1960{ 1961 int error; 1962 1963 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 1964 1965 if (!mac_enforce_fs || !mac_enforce_vm) 1966 return (0); 1967 1968 error = vn_refreshlabel(vp, cred); 1969 if (error) 1970 return (error); 1971 1972 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot); 1973 return (error); 1974} 1975 1976void 1977mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 1978{ 1979 int result = *prot; 1980 1981 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 1982 1983 if (!mac_enforce_fs || !mac_enforce_vm) 1984 return; 1985 1986 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label, 1987 &result); 1988 1989 *prot = result; 1990} 1991 1992int 1993mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 1994{ 1995 int error; 1996 1997 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 1998 1999 if (!mac_enforce_fs || !mac_enforce_vm) 2000 return (0); 2001 2002 error = vn_refreshlabel(vp, cred); 2003 if (error) 2004 return (error); 2005 2006 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot); 2007 return (error); 2008} 2009 2010int 2011mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode) 2012{ 2013 int error; 2014 2015 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 2016 2017 if (!mac_enforce_fs) 2018 return (0); 2019 2020 error = vn_refreshlabel(vp, cred); 2021 if (error) 2022 return (error); 2023 2024 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); 2025 return (error); 2026} 2027 2028int 2029mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 2030 struct vnode *vp) 2031{ 2032 int error; 2033 2034 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 2035 2036 if (!mac_enforce_fs) 2037 return (0); 2038 2039 error = vn_refreshlabel(vp, active_cred); 2040 if (error) 2041 return (error); 2042 2043 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 2044 &vp->v_label); 2045 2046 return (error); 2047} 2048 2049int 2050mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 2051 struct vnode *vp) 2052{ 2053 int error; 2054 2055 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 2056 2057 if (!mac_enforce_fs) 2058 return (0); 2059 2060 error = vn_refreshlabel(vp, active_cred); 2061 if (error) 2062 return (error); 2063 2064 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 2065 &vp->v_label); 2066 2067 return (error); 2068} 2069 2070int 2071mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 2072{ 2073 int error; 2074 2075 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 2076 2077 if (!mac_enforce_fs) 2078 return (0); 2079 2080 error = vn_refreshlabel(dvp, cred); 2081 if (error) 2082 return (error); 2083 2084 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); 2085 return (error); 2086} 2087 2088int 2089mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 2090{ 2091 int error; 2092 2093 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 2094 2095 if (!mac_enforce_fs) 2096 return (0); 2097 2098 error = vn_refreshlabel(vp, cred); 2099 if (error) 2100 return (error); 2101 2102 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); 2103 return (error); 2104} 2105 2106static int 2107mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 2108 struct label *newlabel) 2109{ 2110 int error; 2111 2112 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 2113 2114 error = vn_refreshlabel(vp, cred); 2115 if (error) 2116 return (error); 2117 2118 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); 2119 2120 return (error); 2121} 2122 2123int 2124mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 2125 struct vnode *vp, struct componentname *cnp) 2126{ 2127 int error; 2128 2129 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 2130 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 2131 2132 if (!mac_enforce_fs) 2133 return (0); 2134 2135 error = vn_refreshlabel(dvp, cred); 2136 if (error) 2137 return (error); 2138 error = vn_refreshlabel(vp, cred); 2139 if (error) 2140 return (error); 2141 2142 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, 2143 &vp->v_label, cnp); 2144 return (error); 2145} 2146 2147int 2148mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 2149 struct vnode *vp, int samedir, struct componentname *cnp) 2150{ 2151 int error; 2152 2153 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 2154 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 2155 2156 if (!mac_enforce_fs) 2157 return (0); 2158 2159 error = vn_refreshlabel(dvp, cred); 2160 if (error) 2161 return (error); 2162 if (vp != NULL) { 2163 error = vn_refreshlabel(vp, cred); 2164 if (error) 2165 return (error); 2166 } 2167 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, 2168 vp != NULL ? &vp->v_label : NULL, samedir, cnp); 2169 return (error); 2170} 2171 2172int 2173mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 2174{ 2175 int error; 2176 2177 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 2178 2179 if (!mac_enforce_fs) 2180 return (0); 2181 2182 error = vn_refreshlabel(vp, cred); 2183 if (error) 2184 return (error); 2185 2186 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); 2187 return (error); 2188} 2189 2190int 2191mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 2192 struct acl *acl) 2193{ 2194 int error; 2195 2196 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 2197 2198 if (!mac_enforce_fs) 2199 return (0); 2200 2201 error = vn_refreshlabel(vp, cred); 2202 if (error) 2203 return (error); 2204 2205 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); 2206 return (error); 2207} 2208 2209int 2210mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 2211 int attrnamespace, const char *name, struct uio *uio) 2212{ 2213 int error; 2214 2215 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 2216 2217 if (!mac_enforce_fs) 2218 return (0); 2219 2220 error = vn_refreshlabel(vp, cred); 2221 if (error) 2222 return (error); 2223 2224 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, 2225 attrnamespace, name, uio); 2226 return (error); 2227} 2228 2229int 2230mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 2231{ 2232 int error; 2233 2234 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 2235 2236 if (!mac_enforce_fs) 2237 return (0); 2238 2239 error = vn_refreshlabel(vp, cred); 2240 if (error) 2241 return (error); 2242 2243 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); 2244 return (error); 2245} 2246 2247int 2248mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 2249{ 2250 int error; 2251 2252 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 2253 2254 if (!mac_enforce_fs) 2255 return (0); 2256 2257 error = vn_refreshlabel(vp, cred); 2258 if (error) 2259 return (error); 2260 2261 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); 2262 return (error); 2263} 2264 2265int 2266mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 2267 gid_t gid) 2268{ 2269 int error; 2270 2271 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 2272 2273 if (!mac_enforce_fs) 2274 return (0); 2275 2276 error = vn_refreshlabel(vp, cred); 2277 if (error) 2278 return (error); 2279 2280 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); 2281 return (error); 2282} 2283 2284int 2285mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 2286 struct timespec atime, struct timespec mtime) 2287{ 2288 int error; 2289 2290 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 2291 2292 if (!mac_enforce_fs) 2293 return (0); 2294 2295 error = vn_refreshlabel(vp, cred); 2296 if (error) 2297 return (error); 2298 2299 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, 2300 mtime); 2301 return (error); 2302} 2303 2304int 2305mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2306 struct vnode *vp) 2307{ 2308 int error; 2309 2310 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 2311 2312 if (!mac_enforce_fs) 2313 return (0); 2314 2315 error = vn_refreshlabel(vp, active_cred); 2316 if (error) 2317 return (error); 2318 2319 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 2320 &vp->v_label); 2321 return (error); 2322} 2323 2324int 2325mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 2326 struct vnode *vp) 2327{ 2328 int error; 2329 2330 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 2331 2332 if (!mac_enforce_fs) 2333 return (0); 2334 2335 error = vn_refreshlabel(vp, active_cred); 2336 if (error) 2337 return (error); 2338 2339 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 2340 &vp->v_label); 2341 2342 return (error); 2343} 2344 2345/* 2346 * When relabeling a process, call out to the policies for the maximum 2347 * permission allowed for each object type we know about in its 2348 * memory space, and revoke access (in the least surprising ways we 2349 * know) when necessary. The process lock is not held here. 2350 */ 2351static void 2352mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) 2353{ 2354 2355 /* XXX freeze all other threads */ 2356 mac_cred_mmapped_drop_perms_recurse(td, cred, 2357 &td->td_proc->p_vmspace->vm_map); 2358 /* XXX allow other threads to continue */ 2359} 2360 2361static __inline const char * 2362prot2str(vm_prot_t prot) 2363{ 2364 2365 switch (prot & VM_PROT_ALL) { 2366 case VM_PROT_READ: 2367 return ("r--"); 2368 case VM_PROT_READ | VM_PROT_WRITE: 2369 return ("rw-"); 2370 case VM_PROT_READ | VM_PROT_EXECUTE: 2371 return ("r-x"); 2372 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 2373 return ("rwx"); 2374 case VM_PROT_WRITE: 2375 return ("-w-"); 2376 case VM_PROT_EXECUTE: 2377 return ("--x"); 2378 case VM_PROT_WRITE | VM_PROT_EXECUTE: 2379 return ("-wx"); 2380 default: 2381 return ("---"); 2382 } 2383} 2384 2385static void 2386mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, 2387 struct vm_map *map) 2388{ 2389 struct vm_map_entry *vme; 2390 int result; 2391 vm_prot_t revokeperms; 2392 vm_object_t object; 2393 vm_ooffset_t offset; 2394 struct vnode *vp; 2395 2396 if (!mac_mmap_revocation) 2397 return; 2398 2399 vm_map_lock_read(map); 2400 for (vme = map->header.next; vme != &map->header; vme = vme->next) { 2401 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { 2402 mac_cred_mmapped_drop_perms_recurse(td, cred, 2403 vme->object.sub_map); 2404 continue; 2405 } 2406 /* 2407 * Skip over entries that obviously are not shared. 2408 */ 2409 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || 2410 !vme->max_protection) 2411 continue; 2412 /* 2413 * Drill down to the deepest backing object. 2414 */ 2415 offset = vme->offset; 2416 object = vme->object.vm_object; 2417 if (object == NULL) 2418 continue; 2419 while (object->backing_object != NULL) { 2420 object = object->backing_object; 2421 offset += object->backing_object_offset; 2422 } 2423 /* 2424 * At the moment, vm_maps and objects aren't considered 2425 * by the MAC system, so only things with backing by a 2426 * normal object (read: vnodes) are checked. 2427 */ 2428 if (object->type != OBJT_VNODE) 2429 continue; 2430 vp = (struct vnode *)object->handle; 2431 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2432 result = vme->max_protection; 2433 mac_check_vnode_mmap_downgrade(cred, vp, &result); 2434 VOP_UNLOCK(vp, 0, td); 2435 /* 2436 * Find out what maximum protection we may be allowing 2437 * now but a policy needs to get removed. 2438 */ 2439 revokeperms = vme->max_protection & ~result; 2440 if (!revokeperms) 2441 continue; 2442 printf("pid %ld: revoking %s perms from %#lx:%ld " 2443 "(max %s/cur %s)\n", (long)td->td_proc->p_pid, 2444 prot2str(revokeperms), (u_long)vme->start, 2445 (long)(vme->end - vme->start), 2446 prot2str(vme->max_protection), prot2str(vme->protection)); 2447 vm_map_lock_upgrade(map); 2448 /* 2449 * This is the really simple case: if a map has more 2450 * max_protection than is allowed, but it's not being 2451 * actually used (that is, the current protection is 2452 * still allowed), we can just wipe it out and do 2453 * nothing more. 2454 */ 2455 if ((vme->protection & revokeperms) == 0) { 2456 vme->max_protection -= revokeperms; 2457 } else { 2458 if (revokeperms & VM_PROT_WRITE) { 2459 /* 2460 * In the more complicated case, flush out all 2461 * pending changes to the object then turn it 2462 * copy-on-write. 2463 */ 2464 vm_object_reference(object); 2465 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2466 vm_object_page_clean(object, 2467 OFF_TO_IDX(offset), 2468 OFF_TO_IDX(offset + vme->end - vme->start + 2469 PAGE_MASK), 2470 OBJPC_SYNC); 2471 VOP_UNLOCK(vp, 0, td); 2472 vm_object_deallocate(object); 2473 /* 2474 * Why bother if there's no read permissions 2475 * anymore? For the rest, we need to leave 2476 * the write permissions on for COW, or 2477 * remove them entirely if configured to. 2478 */ 2479 if (!mac_mmap_revocation_via_cow) { 2480 vme->max_protection &= ~VM_PROT_WRITE; 2481 vme->protection &= ~VM_PROT_WRITE; 2482 } if ((revokeperms & VM_PROT_READ) == 0) 2483 vme->eflags |= MAP_ENTRY_COW | 2484 MAP_ENTRY_NEEDS_COPY; 2485 } 2486 if (revokeperms & VM_PROT_EXECUTE) { 2487 vme->max_protection &= ~VM_PROT_EXECUTE; 2488 vme->protection &= ~VM_PROT_EXECUTE; 2489 } 2490 if (revokeperms & VM_PROT_READ) { 2491 vme->max_protection = 0; 2492 vme->protection = 0; 2493 } 2494 pmap_protect(map->pmap, vme->start, vme->end, 2495 vme->protection & ~revokeperms); 2496 vm_map_simplify_entry(map, vme); 2497 } 2498 vm_map_lock_downgrade(map); 2499 } 2500 vm_map_unlock_read(map); 2501} 2502 2503/* 2504 * When the subject's label changes, it may require revocation of privilege 2505 * to mapped objects. This can't be done on-the-fly later with a unified 2506 * buffer cache. 2507 */ 2508static void 2509mac_relabel_cred(struct ucred *cred, struct label *newlabel) 2510{ 2511 2512 MAC_PERFORM(relabel_cred, cred, newlabel); 2513} 2514 2515void 2516mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 2517{ 2518 2519 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); 2520} 2521 2522void 2523mac_create_ifnet(struct ifnet *ifnet) 2524{ 2525 2526 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label); 2527} 2528 2529void 2530mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d) 2531{ 2532 2533 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label); 2534} 2535 2536void 2537mac_create_socket(struct ucred *cred, struct socket *socket) 2538{ 2539 2540 MAC_PERFORM(create_socket, cred, socket, &socket->so_label); 2541} 2542 2543void 2544mac_create_pipe(struct ucred *cred, struct pipe *pipe) 2545{ 2546 2547 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); 2548} 2549 2550void 2551mac_create_socket_from_socket(struct socket *oldsocket, 2552 struct socket *newsocket) 2553{ 2554 2555 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label, 2556 newsocket, &newsocket->so_label); 2557} 2558 2559static void 2560mac_relabel_socket(struct ucred *cred, struct socket *socket, 2561 struct label *newlabel) 2562{ 2563 2564 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); 2565} 2566 2567static void 2568mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) 2569{ 2570 2571 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); 2572} 2573 2574void 2575mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) 2576{ 2577 2578 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label, 2579 socket, &socket->so_peerlabel); 2580} 2581 2582void 2583mac_set_socket_peer_from_socket(struct socket *oldsocket, 2584 struct socket *newsocket) 2585{ 2586 2587 MAC_PERFORM(set_socket_peer_from_socket, oldsocket, 2588 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel); 2589} 2590 2591void 2592mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram) 2593{ 2594 2595 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label, 2596 datagram, &datagram->m_pkthdr.label); 2597} 2598 2599void 2600mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment) 2601{ 2602 2603 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label, 2604 fragment, &fragment->m_pkthdr.label); 2605} 2606 2607void 2608mac_create_ipq(struct mbuf *fragment, struct ipq *ipq) 2609{ 2610 2611 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq, 2612 &ipq->ipq_label); 2613} 2614 2615void 2616mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2617{ 2618 2619 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label, 2620 newmbuf, &newmbuf->m_pkthdr.label); 2621} 2622 2623void 2624mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf) 2625{ 2626 2627 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf, 2628 &mbuf->m_pkthdr.label); 2629} 2630 2631void 2632mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf) 2633{ 2634 2635 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf, 2636 &mbuf->m_pkthdr.label); 2637} 2638 2639void 2640mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf) 2641{ 2642 2643 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf, 2644 &mbuf->m_pkthdr.label); 2645} 2646 2647void 2648mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet, 2649 struct mbuf *newmbuf) 2650{ 2651 2652 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, 2653 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf, 2654 &newmbuf->m_pkthdr.label); 2655} 2656 2657void 2658mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2659{ 2660 2661 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label, 2662 newmbuf, &newmbuf->m_pkthdr.label); 2663} 2664 2665int 2666mac_fragment_match(struct mbuf *fragment, struct ipq *ipq) 2667{ 2668 int result; 2669 2670 result = 1; 2671 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label, 2672 ipq, &ipq->ipq_label); 2673 2674 return (result); 2675} 2676 2677void 2678mac_update_ipq(struct mbuf *fragment, struct ipq *ipq) 2679{ 2680 2681 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq, 2682 &ipq->ipq_label); 2683} 2684 2685void 2686mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) 2687{ 2688 2689 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf, 2690 &mbuf->m_pkthdr.label); 2691} 2692 2693void 2694mac_create_mount(struct ucred *cred, struct mount *mp) 2695{ 2696 2697 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, 2698 &mp->mnt_fslabel); 2699} 2700 2701void 2702mac_create_root_mount(struct ucred *cred, struct mount *mp) 2703{ 2704 2705 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, 2706 &mp->mnt_fslabel); 2707} 2708 2709int 2710mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) 2711{ 2712 int error; 2713 2714 if (!mac_enforce_network) 2715 return (0); 2716 2717 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet, 2718 &ifnet->if_label); 2719 2720 return (error); 2721} 2722 2723static int 2724mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) 2725{ 2726 int error; 2727 2728 MAC_CHECK(check_cred_relabel, cred, newlabel); 2729 2730 return (error); 2731} 2732 2733int 2734mac_check_cred_visible(struct ucred *u1, struct ucred *u2) 2735{ 2736 int error; 2737 2738 if (!mac_enforce_process) 2739 return (0); 2740 2741 MAC_CHECK(check_cred_visible, u1, u2); 2742 2743 return (error); 2744} 2745 2746int 2747mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) 2748{ 2749 int error; 2750 2751 if (!mac_enforce_network) 2752 return (0); 2753 2754 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr")); 2755 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED)) 2756 printf("%s%d: not initialized\n", ifnet->if_name, 2757 ifnet->if_unit); 2758 2759 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf, 2760 &mbuf->m_pkthdr.label); 2761 2762 return (error); 2763} 2764 2765int 2766mac_check_mount_stat(struct ucred *cred, struct mount *mount) 2767{ 2768 int error; 2769 2770 if (!mac_enforce_fs) 2771 return (0); 2772 2773 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); 2774 2775 return (error); 2776} 2777 2778int 2779mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, 2780 void *data) 2781{ 2782 int error; 2783 2784 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2785 2786 if (!mac_enforce_pipe) 2787 return (0); 2788 2789 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); 2790 2791 return (error); 2792} 2793 2794int 2795mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) 2796{ 2797 int error; 2798 2799 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2800 2801 if (!mac_enforce_pipe) 2802 return (0); 2803 2804 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); 2805 2806 return (error); 2807} 2808 2809int 2810mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) 2811{ 2812 int error; 2813 2814 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2815 2816 if (!mac_enforce_pipe) 2817 return (0); 2818 2819 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); 2820 2821 return (error); 2822} 2823 2824static int 2825mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 2826 struct label *newlabel) 2827{ 2828 int error; 2829 2830 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2831 2832 if (!mac_enforce_pipe) 2833 return (0); 2834 2835 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); 2836 2837 return (error); 2838} 2839 2840int 2841mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) 2842{ 2843 int error; 2844 2845 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2846 2847 if (!mac_enforce_pipe) 2848 return (0); 2849 2850 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); 2851 2852 return (error); 2853} 2854 2855int 2856mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) 2857{ 2858 int error; 2859 2860 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2861 2862 if (!mac_enforce_pipe) 2863 return (0); 2864 2865 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); 2866 2867 return (error); 2868} 2869 2870int 2871mac_check_proc_debug(struct ucred *cred, struct proc *proc) 2872{ 2873 int error; 2874 2875 PROC_LOCK_ASSERT(proc, MA_OWNED); 2876 2877 if (!mac_enforce_process) 2878 return (0); 2879 2880 MAC_CHECK(check_proc_debug, cred, proc); 2881 2882 return (error); 2883} 2884 2885int 2886mac_check_proc_sched(struct ucred *cred, struct proc *proc) 2887{ 2888 int error; 2889 2890 PROC_LOCK_ASSERT(proc, MA_OWNED); 2891 2892 if (!mac_enforce_process) 2893 return (0); 2894 2895 MAC_CHECK(check_proc_sched, cred, proc); 2896 2897 return (error); 2898} 2899 2900int 2901mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 2902{ 2903 int error; 2904 2905 PROC_LOCK_ASSERT(proc, MA_OWNED); 2906 2907 if (!mac_enforce_process) 2908 return (0); 2909 2910 MAC_CHECK(check_proc_signal, cred, proc, signum); 2911 2912 return (error); 2913} 2914 2915int 2916mac_check_socket_bind(struct ucred *ucred, struct socket *socket, 2917 struct sockaddr *sockaddr) 2918{ 2919 int error; 2920 2921 if (!mac_enforce_socket) 2922 return (0); 2923 2924 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label, 2925 sockaddr); 2926 2927 return (error); 2928} 2929 2930int 2931mac_check_socket_connect(struct ucred *cred, struct socket *socket, 2932 struct sockaddr *sockaddr) 2933{ 2934 int error; 2935 2936 if (!mac_enforce_socket) 2937 return (0); 2938 2939 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label, 2940 sockaddr); 2941 2942 return (error); 2943} 2944 2945int 2946mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf) 2947{ 2948 int error; 2949 2950 if (!mac_enforce_socket) 2951 return (0); 2952 2953 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf, 2954 &mbuf->m_pkthdr.label); 2955 2956 return (error); 2957} 2958 2959int 2960mac_check_socket_listen(struct ucred *cred, struct socket *socket) 2961{ 2962 int error; 2963 2964 if (!mac_enforce_socket) 2965 return (0); 2966 2967 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label); 2968 return (error); 2969} 2970 2971int 2972mac_check_socket_receive(struct ucred *cred, struct socket *so) 2973{ 2974 int error; 2975 2976 if (!mac_enforce_socket) 2977 return (0); 2978 2979 MAC_CHECK(check_socket_receive, cred, so, &so->so_label); 2980 2981 return (error); 2982} 2983 2984static int 2985mac_check_socket_relabel(struct ucred *cred, struct socket *socket, 2986 struct label *newlabel) 2987{ 2988 int error; 2989 2990 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label, 2991 newlabel); 2992 2993 return (error); 2994} 2995 2996int 2997mac_check_socket_send(struct ucred *cred, struct socket *so) 2998{ 2999 int error; 3000 3001 if (!mac_enforce_socket) 3002 return (0); 3003 3004 MAC_CHECK(check_socket_send, cred, so, &so->so_label); 3005 3006 return (error); 3007} 3008 3009int 3010mac_check_socket_visible(struct ucred *cred, struct socket *socket) 3011{ 3012 int error; 3013 3014 if (!mac_enforce_socket) 3015 return (0); 3016 3017 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label); 3018 3019 return (error); 3020} 3021 3022int 3023mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 3024 struct ifnet *ifnet) 3025{ 3026 struct mac label; 3027 int error; 3028 3029 error = mac_externalize(&ifnet->if_label, &label); 3030 if (error) 3031 return (error); 3032 3033 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label))); 3034} 3035 3036int 3037mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 3038 struct ifnet *ifnet) 3039{ 3040 struct mac newlabel; 3041 struct label intlabel; 3042 int error; 3043 3044 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel)); 3045 if (error) 3046 return (error); 3047 3048 error = mac_internalize(&intlabel, &newlabel); 3049 if (error) 3050 return (error); 3051 3052 /* 3053 * XXX: Note that this is a redundant privilege check, since 3054 * policies impose this check themselves if required by the 3055 * policy. Eventually, this should go away. 3056 */ 3057 error = suser_cred(cred, 0); 3058 if (error) 3059 goto out; 3060 3061 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label, 3062 &intlabel); 3063 if (error) 3064 goto out; 3065 3066 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel); 3067 3068out: 3069 mac_destroy_temp(&intlabel); 3070 return (error); 3071} 3072 3073void 3074mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp) 3075{ 3076 3077 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label); 3078} 3079 3080void 3081mac_create_devfs_device(dev_t dev, struct devfs_dirent *de) 3082{ 3083 3084 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label); 3085} 3086 3087void 3088mac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd, 3089 struct devfs_dirent *de) 3090{ 3091 3092 MAC_PERFORM(create_devfs_symlink, cred, dd, &dd->de_label, de, 3093 &de->de_label); 3094} 3095 3096static int 3097mac_stdcreatevnode_ea(struct vnode *vp) 3098{ 3099 int error; 3100 3101 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label); 3102 3103 return (error); 3104} 3105 3106void 3107mac_create_devfs_directory(char *dirname, int dirnamelen, 3108 struct devfs_dirent *de) 3109{ 3110 3111 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de, 3112 &de->de_label); 3113} 3114 3115/* 3116 * When a new vnode is created, this call will initialize its label. 3117 */ 3118void 3119mac_create_vnode(struct ucred *cred, struct vnode *parent, 3120 struct vnode *child) 3121{ 3122 int error; 3123 3124 ASSERT_VOP_LOCKED(parent, "mac_create_vnode"); 3125 ASSERT_VOP_LOCKED(child, "mac_create_vnode"); 3126 3127 error = vn_refreshlabel(parent, cred); 3128 if (error) { 3129 printf("mac_create_vnode: vn_refreshlabel returned %d\n", 3130 error); 3131 printf("mac_create_vnode: using old vnode label\n"); 3132 } 3133 3134 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child, 3135 &child->v_label); 3136} 3137 3138int 3139mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 3140 struct mac *extmac) 3141{ 3142 struct label intlabel; 3143 int error; 3144 3145 error = mac_internalize(&intlabel, extmac); 3146 if (error) 3147 return (error); 3148 3149 mac_check_socket_relabel(cred, so, &intlabel); 3150 if (error) { 3151 mac_destroy_temp(&intlabel); 3152 return (error); 3153 } 3154 3155 mac_relabel_socket(cred, so, &intlabel); 3156 3157 mac_destroy_temp(&intlabel); 3158 return (0); 3159} 3160 3161int 3162mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) 3163{ 3164 int error; 3165 3166 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 3167 3168 error = mac_check_pipe_relabel(cred, pipe, label); 3169 if (error) 3170 return (error); 3171 3172 mac_relabel_pipe(cred, pipe, label); 3173 3174 return (0); 3175} 3176 3177int 3178mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 3179 struct mac *extmac) 3180{ 3181 3182 return (mac_externalize(&so->so_label, extmac)); 3183} 3184 3185int 3186mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 3187 struct mac *extmac) 3188{ 3189 3190 return (mac_externalize(&so->so_peerlabel, extmac)); 3191} 3192 3193/* 3194 * Implementation of VOP_SETLABEL() that relies on extended attributes 3195 * to store label data. Can be referenced by filesystems supporting 3196 * extended attributes. 3197 */ 3198int 3199vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 3200{ 3201 struct vnode *vp = ap->a_vp; 3202 struct label *intlabel = ap->a_label; 3203 struct mac extmac; 3204 int error; 3205 3206 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 3207 3208 /* 3209 * XXX: Eventually call out to EA check/set calls here. 3210 * Be particularly careful to avoid race conditions, 3211 * consistency problems, and stability problems when 3212 * dealing with multiple EAs. In particular, we require 3213 * the ability to write multiple EAs on the same file in 3214 * a single transaction, which the current EA interface 3215 * does not provide. 3216 */ 3217 3218 error = mac_externalize(intlabel, &extmac); 3219 if (error) 3220 return (error); 3221 3222 error = vn_extattr_set(vp, IO_NODELOCKED, 3223 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, 3224 sizeof(extmac), (char *)&extmac, curthread); 3225 if (error) 3226 return (error); 3227 3228 mac_relabel_vnode(ap->a_cred, vp, intlabel); 3229 3230 vp->v_vflag |= VV_CACHEDLABEL; 3231 3232 return (0); 3233} 3234 3235static int 3236vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 3237{ 3238 int error; 3239 3240 if (vp->v_mount == NULL) { 3241 /* printf("vn_setlabel: null v_mount\n"); */ 3242 if (vp->v_type != VNON) 3243 printf("vn_setlabel: null v_mount with non-VNON\n"); 3244 return (EBADF); 3245 } 3246 3247 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3248 return (EOPNOTSUPP); 3249 3250 /* 3251 * Multi-phase commit. First check the policies to confirm the 3252 * change is OK. Then commit via the filesystem. Finally, 3253 * update the actual vnode label. Question: maybe the filesystem 3254 * should update the vnode at the end as part of VOP_SETLABEL()? 3255 */ 3256 error = mac_check_vnode_relabel(cred, vp, intlabel); 3257 if (error) 3258 return (error); 3259 3260 /* 3261 * VADMIN provides the opportunity for the filesystem to make 3262 * decisions about who is and is not able to modify labels 3263 * and protections on files. This might not be right. We can't 3264 * assume VOP_SETLABEL() will do it, because we might implement 3265 * that as part of vop_stdsetlabel_ea(). 3266 */ 3267 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 3268 if (error) 3269 return (error); 3270 3271 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 3272 if (error) 3273 return (error); 3274 3275 return (0); 3276} 3277 3278/* 3279 * MPSAFE 3280 */ 3281int 3282__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3283{ 3284 struct mac extmac; 3285 int error; 3286 3287 error = mac_externalize(&td->td_ucred->cr_label, &extmac); 3288 if (error == 0) 3289 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3290 3291 return (error); 3292} 3293 3294/* 3295 * MPSAFE 3296 */ 3297int 3298__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3299{ 3300 struct ucred *newcred, *oldcred; 3301 struct proc *p; 3302 struct mac extmac; 3303 struct label intlabel; 3304 int error; 3305 3306 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3307 if (error) 3308 return (error); 3309 3310 error = mac_internalize(&intlabel, &extmac); 3311 if (error) 3312 return (error); 3313 3314 newcred = crget(); 3315 3316 p = td->td_proc; 3317 PROC_LOCK(p); 3318 oldcred = p->p_ucred; 3319 3320 error = mac_check_cred_relabel(oldcred, &intlabel); 3321 if (error) { 3322 PROC_UNLOCK(p); 3323 mac_destroy_temp(&intlabel); 3324 crfree(newcred); 3325 return (error); 3326 } 3327 3328 setsugid(p); 3329 crcopy(newcred, oldcred); 3330 mac_relabel_cred(newcred, &intlabel); 3331 p->p_ucred = newcred; 3332 3333 /* 3334 * Grab additional reference for use while revoking mmaps, prior 3335 * to releasing the proc lock and sharing the cred. 3336 */ 3337 crhold(newcred); 3338 PROC_UNLOCK(p); 3339 3340 mtx_lock(&Giant); 3341 mac_cred_mmapped_drop_perms(td, newcred); 3342 mtx_unlock(&Giant); 3343 3344 crfree(newcred); /* Free revocation reference. */ 3345 crfree(oldcred); 3346 mac_destroy_temp(&intlabel); 3347 return (0); 3348} 3349 3350/* 3351 * MPSAFE 3352 */ 3353int 3354__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3355{ 3356 struct file *fp; 3357 struct mac extmac; 3358 struct vnode *vp; 3359 struct pipe *pipe; 3360 int error; 3361 3362 mtx_lock(&Giant); 3363 3364 error = fget(td, SCARG(uap, fd), &fp); 3365 if (error) 3366 goto out; 3367 3368 switch (fp->f_type) { 3369 case DTYPE_FIFO: 3370 case DTYPE_VNODE: 3371 vp = (struct vnode *)fp->f_data; 3372 3373 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3374 error = vn_refreshlabel(vp, td->td_ucred); 3375 if (error == 0) 3376 error = mac_externalize(&vp->v_label, &extmac); 3377 VOP_UNLOCK(vp, 0, td); 3378 break; 3379 case DTYPE_PIPE: 3380 pipe = (struct pipe *)fp->f_data; 3381 error = mac_externalize(pipe->pipe_label, &extmac); 3382 break; 3383 default: 3384 error = EINVAL; 3385 } 3386 3387 if (error == 0) 3388 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3389 3390 fdrop(fp, td); 3391 3392out: 3393 mtx_unlock(&Giant); 3394 return (error); 3395} 3396 3397/* 3398 * MPSAFE 3399 */ 3400int 3401__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3402{ 3403 struct nameidata nd; 3404 struct mac extmac; 3405 int error; 3406 3407 mtx_lock(&Giant); 3408 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, 3409 SCARG(uap, path_p), td); 3410 error = namei(&nd); 3411 if (error) 3412 goto out; 3413 3414 error = vn_refreshlabel(nd.ni_vp, td->td_ucred); 3415 if (error == 0) 3416 error = mac_externalize(&nd.ni_vp->v_label, &extmac); 3417 NDFREE(&nd, 0); 3418 if (error) 3419 goto out; 3420 3421 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac)); 3422 3423out: 3424 mtx_unlock(&Giant); 3425 return (error); 3426} 3427 3428/* 3429 * MPSAFE 3430 */ 3431int 3432__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3433{ 3434 struct file *fp; 3435 struct mac extmac; 3436 struct label intlabel; 3437 struct mount *mp; 3438 struct vnode *vp; 3439 struct pipe *pipe; 3440 int error; 3441 3442 mtx_lock(&Giant); 3443 error = fget(td, SCARG(uap, fd), &fp); 3444 if (error) 3445 goto out1; 3446 3447 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3448 if (error) 3449 goto out2; 3450 3451 error = mac_internalize(&intlabel, &extmac); 3452 if (error) 3453 goto out2; 3454 3455 switch (fp->f_type) { 3456 case DTYPE_FIFO: 3457 case DTYPE_VNODE: 3458 vp = (struct vnode *)fp->f_data; 3459 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3460 if (error != 0) 3461 break; 3462 3463 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3464 error = vn_setlabel(vp, &intlabel, td->td_ucred); 3465 VOP_UNLOCK(vp, 0, td); 3466 vn_finished_write(mp); 3467 mac_destroy_temp(&intlabel); 3468 break; 3469 case DTYPE_PIPE: 3470 pipe = (struct pipe *)fp->f_data; 3471 PIPE_LOCK(pipe); 3472 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel); 3473 PIPE_UNLOCK(pipe); 3474 break; 3475 default: 3476 error = EINVAL; 3477 } 3478 3479out2: 3480 fdrop(fp, td); 3481out1: 3482 mtx_unlock(&Giant); 3483 return (error); 3484} 3485 3486/* 3487 * MPSAFE 3488 */ 3489int 3490__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3491{ 3492 struct nameidata nd; 3493 struct mac extmac; 3494 struct label intlabel; 3495 struct mount *mp; 3496 int error; 3497 3498 mtx_lock(&Giant); 3499 3500 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac)); 3501 if (error) 3502 goto out; 3503 3504 error = mac_internalize(&intlabel, &extmac); 3505 if (error) 3506 goto out; 3507 3508 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, 3509 SCARG(uap, path_p), td); 3510 error = namei(&nd); 3511 if (error) 3512 goto out2; 3513 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3514 if (error) 3515 goto out2; 3516 3517 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred); 3518 3519 vn_finished_write(mp); 3520out2: 3521 mac_destroy_temp(&intlabel); 3522 NDFREE(&nd, 0); 3523out: 3524 mtx_unlock(&Giant); 3525 return (error); 3526} 3527 3528int 3529mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3530{ 3531 struct mac_policy_conf *mpc; 3532 char target[MAC_MAX_POLICY_NAME]; 3533 int error; 3534 3535 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL); 3536 if (error) 3537 return (error); 3538 3539 error = ENOSYS; 3540 MAC_POLICY_LIST_BUSY(); 3541 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3542 if (strcmp(mpc->mpc_name, target) == 0 && 3543 mpc->mpc_ops->mpo_syscall != NULL) { 3544 error = mpc->mpc_ops->mpo_syscall(td, 3545 SCARG(uap, call), SCARG(uap, arg)); 3546 goto out; 3547 } 3548 } 3549 3550out: 3551 MAC_POLICY_LIST_UNBUSY(); 3552 return (error); 3553} 3554 3555SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); 3556SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); 3557 3558#else /* !MAC */ 3559 3560int 3561__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3562{ 3563 3564 return (ENOSYS); 3565} 3566 3567int 3568__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3569{ 3570 3571 return (ENOSYS); 3572} 3573 3574int 3575__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3576{ 3577 3578 return (ENOSYS); 3579} 3580 3581int 3582__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3583{ 3584 3585 return (ENOSYS); 3586} 3587 3588int 3589__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3590{ 3591 3592 return (ENOSYS); 3593} 3594 3595int 3596__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3597{ 3598 3599 return (ENOSYS); 3600} 3601 3602int 3603mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3604{ 3605 3606 return (ENOSYS); 3607} 3608 3609#endif /* !MAC */
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