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