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 Network 11 * Associates Laboratories, the Security Research Division of Network 12 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 13 * as part of the DARPA 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 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $FreeBSD$ 37 */ 38 /* 39 * Developed by the TrustedBSD Project. 40 * 41 * Framework for extensible kernel access control. Kernel and userland 42 * interface to the framework, policy registration and composition. 43 */ 44 45 #include "opt_mac.h" 46 #include "opt_devfs.h" 47 48 #include <sys/param.h> 49 #include <sys/extattr.h> 50 #include <sys/imgact.h> 51 #include <sys/kernel.h> 52 #include <sys/lock.h> 53 #include <sys/malloc.h> 54 #include <sys/mutex.h> 55 #include <sys/mac.h> 56 #include <sys/module.h> 57 #include <sys/proc.h> 58 #include <sys/systm.h> 59 #include <sys/sysproto.h> 60 #include <sys/sysent.h> 61 #include <sys/vnode.h> 62 #include <sys/mount.h> 63 #include <sys/file.h> 64 #include <sys/namei.h> 65 #include <sys/socket.h> 66 #include <sys/pipe.h> 67 #include <sys/socketvar.h> 68 #include <sys/sysctl.h> 69 70 #include <vm/vm.h> 71 #include <vm/pmap.h> 72 #include <vm/vm_map.h> 73 #include <vm/vm_object.h> 74 75 #include <sys/mac_policy.h> 76 77 #include <fs/devfs/devfs.h> 78 79 #include <net/bpfdesc.h> 80 #include <net/if.h> 81 #include <net/if_var.h> 82 83 #include <netinet/in.h> 84 #include <netinet/ip_var.h> 85 86 #ifdef MAC 87 88 /* 89 * Declare that the kernel provides MAC support, version 1. This permits 90 * modules to refuse to be loaded if the necessary support isn't present, 91 * even if it's pre-boot. 92 */ 93 MODULE_VERSION(kernel_mac_support, 1); 94 95 SYSCTL_DECL(_security); 96 97 SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0, 98 "TrustedBSD MAC policy controls"); 99 100 #if MAC_MAX_POLICIES > 32 101 #error "MAC_MAX_POLICIES too large" 102 #endif 103 104 static unsigned int mac_max_policies = MAC_MAX_POLICIES; 105 static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1; 106 SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD, 107 &mac_max_policies, 0, ""); 108 109 /* 110 * Has the kernel started generating labeled objects yet? All read/write 111 * access to this variable is serialized during the boot process. Following 112 * the end of serialization, we don't update this flag; no locking. 113 */ 114 static int mac_late = 0; 115 116 /* 117 * Warn about EA transactions only the first time they happen. 118 * Weak coherency, no locking. 119 */ 120 static int ea_warn_once = 0; 121 122 static int mac_enforce_fs = 1; 123 SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW, 124 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects"); 125 TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs); 126 127 static int mac_enforce_network = 1; 128 SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW, 129 &mac_enforce_network, 0, "Enforce MAC policy on network packets"); 130 TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network); 131 132 static int mac_enforce_pipe = 1; 133 SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW, 134 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations"); 135 TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe); 136 137 static int mac_enforce_process = 1; 138 SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW, 139 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations"); 140 TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process); 141 142 static int mac_enforce_socket = 1; 143 SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW, 144 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations"); 145 TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket); 146 147 static int mac_enforce_system = 1; 148 SYSCTL_INT(_security_mac, OID_AUTO, enforce_system, CTLFLAG_RW, 149 &mac_enforce_system, 0, "Enforce MAC policy on system operations"); 150 TUNABLE_INT("security.mac.enforce_system", &mac_enforce_system); 151 152 static int mac_enforce_vm = 1; 153 SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW, 154 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations"); 155 TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm); 156 157 static int mac_mmap_revocation = 1; 158 SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW, 159 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject " 160 "relabel"); 161 static int mac_mmap_revocation_via_cow = 0; 162 SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW, 163 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via " 164 "copy-on-write semantics, or by removing all write access"); 165 166 #ifdef MAC_DEBUG 167 SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0, 168 "TrustedBSD MAC debug info"); 169 170 static int mac_debug_label_fallback = 0; 171 SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW, 172 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label" 173 "when label is corrupted."); 174 TUNABLE_INT("security.mac.debug_label_fallback", 175 &mac_debug_label_fallback); 176 177 SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0, 178 "TrustedBSD MAC object counters"); 179 180 static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs, 181 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents, 182 nmacipqs, nmacpipes; 183 184 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD, 185 &nmacmbufs, 0, "number of mbufs in use"); 186 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD, 187 &nmaccreds, 0, "number of ucreds in use"); 188 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD, 189 &nmacifnets, 0, "number of ifnets in use"); 190 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD, 191 &nmacipqs, 0, "number of ipqs in use"); 192 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD, 193 &nmacbpfdescs, 0, "number of bpfdescs in use"); 194 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD, 195 &nmacsockets, 0, "number of sockets in use"); 196 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD, 197 &nmacpipes, 0, "number of pipes in use"); 198 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD, 199 &nmacmounts, 0, "number of mounts in use"); 200 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD, 201 &nmactemp, 0, "number of temporary labels in use"); 202 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD, 203 &nmacvnodes, 0, "number of vnodes in use"); 204 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD, 205 &nmacdevfsdirents, 0, "number of devfs dirents inuse"); 206 #endif 207 208 static int error_select(int error1, int error2); 209 static int mac_policy_register(struct mac_policy_conf *mpc); 210 static int mac_policy_unregister(struct mac_policy_conf *mpc); 211 212 static void mac_check_vnode_mmap_downgrade(struct ucred *cred, 213 struct vnode *vp, int *prot); 214 static void mac_cred_mmapped_drop_perms_recurse(struct thread *td, 215 struct ucred *cred, struct vm_map *map); 216 217 static void mac_destroy_socket_label(struct label *label); 218 219 static int mac_setlabel_vnode_extattr(struct ucred *cred, 220 struct vnode *vp, struct label *intlabel); 221 222 223 MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector"); 224 MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes"); 225 MALLOC_DEFINE(M_MACTEMP, "mactemp", "MAC temporary label storage"); 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 */ 235 static struct mtx mac_policy_list_lock; 236 static LIST_HEAD(, mac_policy_conf) mac_policy_list; 237 static 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 #define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \ 298 outbuflen) do { \ 299 char *curptr, *curptr_start, *element_name, *element_temp; \ 300 size_t left, left_start, len; \ 301 int claimed, first, first_start, ignorenotfound; \ 302 \ 303 error = 0; \ 304 element_temp = elementlist; \ 305 curptr = outbuf; \ 306 curptr[0] = '\0'; \ 307 left = outbuflen; \ 308 first = 1; \ 309 while ((element_name = strsep(&element_temp, ",")) != NULL) { \ 310 curptr_start = curptr; \ 311 left_start = left; \ 312 first_start = first; \ 313 if (element_name[0] == '?') { \ 314 element_name++; \ 315 ignorenotfound = 1; \ 316 } else \ 317 ignorenotfound = 0; \ 318 claimed = 0; \ 319 if (first) { \ 320 len = snprintf(curptr, left, "%s/", \ 321 element_name); \ 322 first = 0; \ 323 } else \ 324 len = snprintf(curptr, left, ",%s/", \ 325 element_name); \ 326 if (len >= left) { \ 327 error = EINVAL; /* XXXMAC: E2BIG */ \ 328 break; \ 329 } \ 330 curptr += len; \ 331 left -= len; \ 332 \ 333 MAC_CHECK(externalize_ ## type, label, element_name, \ 334 curptr, left, &len, &claimed); \ 335 if (error) \ 336 break; \ 337 if (claimed == 1) { \ 338 if (len >= outbuflen) { \ 339 error = EINVAL; /* XXXMAC: E2BIG */ \ 340 break; \ 341 } \ 342 curptr += len; \ 343 left -= len; \ 344 } else if (claimed == 0 && ignorenotfound) { \ 345 /* \ 346 * Revert addition of the label element \ 347 * name. \ 348 */ \ 349 curptr = curptr_start; \ 350 *curptr = '\0'; \ 351 left = left_start; \ 352 first = first_start; \ 353 } else { \ 354 error = EINVAL; /* XXXMAC: ENOLABEL */ \ 355 break; \ 356 } \ 357 } \ 358 } while (0) 359 360 #define MAC_INTERNALIZE(type, label, instring) do { \ 361 char *element, *element_name, *element_data; \ 362 int claimed; \ 363 \ 364 error = 0; \ 365 element = instring; \ 366 while ((element_name = strsep(&element, ",")) != NULL) { \ 367 element_data = element_name; \ 368 element_name = strsep(&element_data, "/"); \ 369 if (element_data == NULL) { \ 370 error = EINVAL; \ 371 break; \ 372 } \ 373 claimed = 0; \ 374 MAC_CHECK(internalize_ ## type, label, element_name, \ 375 element_data, &claimed); \ 376 if (error) \ 377 break; \ 378 if (claimed != 1) { \ 379 /* XXXMAC: Another error here? */ \ 380 error = EINVAL; \ 381 break; \ 382 } \ 383 } \ 384 } while (0) 385 386 /* 387 * MAC_PERFORM performs the designated operation by walking the policy 388 * module list and invoking that operation for each policy. 389 */ 390 #define MAC_PERFORM(operation, args...) do { \ 391 struct mac_policy_conf *mpc; \ 392 \ 393 MAC_POLICY_LIST_BUSY(); \ 394 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 395 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 396 mpc->mpc_ops->mpo_ ## operation (args); \ 397 } \ 398 MAC_POLICY_LIST_UNBUSY(); \ 399 } while (0) 400 401 /* 402 * Initialize the MAC subsystem, including appropriate SMP locks. 403 */ 404 static void 405 mac_init(void) 406 { 407 408 LIST_INIT(&mac_policy_list); 409 MAC_POLICY_LIST_LOCKINIT(); 410 } 411 412 /* 413 * For the purposes of modules that want to know if they were loaded 414 * "early", set the mac_late flag once we've processed modules either 415 * linked into the kernel, or loaded before the kernel startup. 416 */ 417 static void 418 mac_late_init(void) 419 { 420 421 mac_late = 1; 422 } 423 424 /* 425 * Allow MAC policy modules to register during boot, etc. 426 */ 427 int 428 mac_policy_modevent(module_t mod, int type, void *data) 429 { 430 struct mac_policy_conf *mpc; 431 int error; 432 433 error = 0; 434 mpc = (struct mac_policy_conf *) data; 435 436 switch (type) { 437 case MOD_LOAD: 438 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE && 439 mac_late) { 440 printf("mac_policy_modevent: can't load %s policy " 441 "after booting\n", mpc->mpc_name); 442 error = EBUSY; 443 break; 444 } 445 error = mac_policy_register(mpc); 446 break; 447 case MOD_UNLOAD: 448 /* Don't unregister the module if it was never registered. */ 449 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) 450 != 0) 451 error = mac_policy_unregister(mpc); 452 else 453 error = 0; 454 break; 455 default: 456 break; 457 } 458 459 return (error); 460 } 461 462 static int 463 mac_policy_register(struct mac_policy_conf *mpc) 464 { 465 struct mac_policy_conf *tmpc; 466 int slot; 467 468 MAC_POLICY_LIST_LOCK(); 469 if (mac_policy_list_busy > 0) { 470 MAC_POLICY_LIST_UNLOCK(); 471 return (EBUSY); 472 } 473 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { 474 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { 475 MAC_POLICY_LIST_UNLOCK(); 476 return (EEXIST); 477 } 478 } 479 if (mpc->mpc_field_off != NULL) { 480 slot = ffs(mac_policy_offsets_free); 481 if (slot == 0) { 482 MAC_POLICY_LIST_UNLOCK(); 483 return (ENOMEM); 484 } 485 slot--; 486 mac_policy_offsets_free &= ~(1 << slot); 487 *mpc->mpc_field_off = slot; 488 } 489 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED; 490 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list); 491 492 /* Per-policy initialization. */ 493 if (mpc->mpc_ops->mpo_init != NULL) 494 (*(mpc->mpc_ops->mpo_init))(mpc); 495 MAC_POLICY_LIST_UNLOCK(); 496 497 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname, 498 mpc->mpc_name); 499 500 return (0); 501 } 502 503 static int 504 mac_policy_unregister(struct mac_policy_conf *mpc) 505 { 506 507 /* 508 * If we fail the load, we may get a request to unload. Check 509 * to see if we did the run-time registration, and if not, 510 * silently succeed. 511 */ 512 MAC_POLICY_LIST_LOCK(); 513 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) { 514 MAC_POLICY_LIST_UNLOCK(); 515 return (0); 516 } 517 #if 0 518 /* 519 * Don't allow unloading modules with private data. 520 */ 521 if (mpc->mpc_field_off != NULL) { 522 MAC_POLICY_LIST_UNLOCK(); 523 return (EBUSY); 524 } 525 #endif 526 /* 527 * Only allow the unload to proceed if the module is unloadable 528 * by its own definition. 529 */ 530 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) { 531 MAC_POLICY_LIST_UNLOCK(); 532 return (EBUSY); 533 } 534 /* 535 * Right now, we EBUSY if the list is in use. In the future, 536 * for reliability reasons, we might want to sleep and wakeup 537 * later to try again. 538 */ 539 if (mac_policy_list_busy > 0) { 540 MAC_POLICY_LIST_UNLOCK(); 541 return (EBUSY); 542 } 543 if (mpc->mpc_ops->mpo_destroy != NULL) 544 (*(mpc->mpc_ops->mpo_destroy))(mpc); 545 546 LIST_REMOVE(mpc, mpc_list); 547 MAC_POLICY_LIST_UNLOCK(); 548 549 mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED; 550 551 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname, 552 mpc->mpc_name); 553 554 return (0); 555 } 556 557 /* 558 * Define an error value precedence, and given two arguments, selects the 559 * value with the higher precedence. 560 */ 561 static int 562 error_select(int error1, int error2) 563 { 564 565 /* Certain decision-making errors take top priority. */ 566 if (error1 == EDEADLK || error2 == EDEADLK) 567 return (EDEADLK); 568 569 /* Invalid arguments should be reported where possible. */ 570 if (error1 == EINVAL || error2 == EINVAL) 571 return (EINVAL); 572 573 /* Precedence goes to "visibility", with both process and file. */ 574 if (error1 == ESRCH || error2 == ESRCH) 575 return (ESRCH); 576 577 if (error1 == ENOENT || error2 == ENOENT) 578 return (ENOENT); 579 580 /* Precedence goes to DAC/MAC protections. */ 581 if (error1 == EACCES || error2 == EACCES) 582 return (EACCES); 583 584 /* Precedence goes to privilege. */ 585 if (error1 == EPERM || error2 == EPERM) 586 return (EPERM); 587 588 /* Precedence goes to error over success; otherwise, arbitrary. */ 589 if (error1 != 0) 590 return (error1); 591 return (error2); 592 } 593 594 static void 595 mac_init_label(struct label *label) 596 { 597 598 bzero(label, sizeof(*label)); 599 label->l_flags = MAC_FLAG_INITIALIZED; 600 } 601 602 static void 603 mac_destroy_label(struct label *label) 604 { 605 606 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED, 607 ("destroying uninitialized label")); 608 609 bzero(label, sizeof(*label)); 610 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */ 611 } 612 613 void 614 mac_init_bpfdesc(struct bpf_d *bpf_d) 615 { 616 617 mac_init_label(&bpf_d->bd_label); 618 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label); 619 #ifdef MAC_DEBUG 620 atomic_add_int(&nmacbpfdescs, 1); 621 #endif 622 } 623 624 static void 625 mac_init_cred_label(struct label *label) 626 { 627 628 mac_init_label(label); 629 MAC_PERFORM(init_cred_label, label); 630 #ifdef MAC_DEBUG 631 atomic_add_int(&nmaccreds, 1); 632 #endif 633 } 634 635 void 636 mac_init_cred(struct ucred *cred) 637 { 638 639 mac_init_cred_label(&cred->cr_label); 640 } 641 642 void 643 mac_init_devfsdirent(struct devfs_dirent *de) 644 { 645 646 mac_init_label(&de->de_label); 647 MAC_PERFORM(init_devfsdirent_label, &de->de_label); 648 #ifdef MAC_DEBUG 649 atomic_add_int(&nmacdevfsdirents, 1); 650 #endif 651 } 652 653 static void 654 mac_init_ifnet_label(struct label *label) 655 { 656 657 mac_init_label(label); 658 MAC_PERFORM(init_ifnet_label, label); 659 #ifdef MAC_DEBUG 660 atomic_add_int(&nmacifnets, 1); 661 #endif 662 } 663 664 void 665 mac_init_ifnet(struct ifnet *ifp) 666 { 667 668 mac_init_ifnet_label(&ifp->if_label); 669 } 670 671 void 672 mac_init_ipq(struct ipq *ipq) 673 { 674 675 mac_init_label(&ipq->ipq_label); 676 MAC_PERFORM(init_ipq_label, &ipq->ipq_label); 677 #ifdef MAC_DEBUG 678 atomic_add_int(&nmacipqs, 1); 679 #endif 680 } 681 682 int 683 mac_init_mbuf(struct mbuf *m, int flag) 684 { 685 int error; 686 687 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf")); 688 689 mac_init_label(&m->m_pkthdr.label); 690 691 MAC_CHECK(init_mbuf_label, &m->m_pkthdr.label, flag); 692 if (error) { 693 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label); 694 mac_destroy_label(&m->m_pkthdr.label); 695 } 696 697 #ifdef MAC_DEBUG 698 if (error == 0) 699 atomic_add_int(&nmacmbufs, 1); 700 #endif 701 return (error); 702 } 703 704 void 705 mac_init_mount(struct mount *mp) 706 { 707 708 mac_init_label(&mp->mnt_mntlabel); 709 mac_init_label(&mp->mnt_fslabel); 710 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel); 711 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel); 712 #ifdef MAC_DEBUG 713 atomic_add_int(&nmacmounts, 1); 714 #endif 715 } 716 717 static void 718 mac_init_pipe_label(struct label *label) 719 { 720 721 mac_init_label(label); 722 MAC_PERFORM(init_pipe_label, label); 723 #ifdef MAC_DEBUG 724 atomic_add_int(&nmacpipes, 1); 725 #endif 726 } 727 728 void 729 mac_init_pipe(struct pipe *pipe) 730 { 731 struct label *label; 732 733 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK); 734 pipe->pipe_label = label; 735 pipe->pipe_peer->pipe_label = label; 736 mac_init_pipe_label(label); 737 } 738 739 static int 740 mac_init_socket_label(struct label *label, int flag) 741 { 742 int error; 743 744 mac_init_label(label); 745 746 MAC_CHECK(init_socket_label, label, flag); 747 if (error) { 748 MAC_PERFORM(destroy_socket_label, label); 749 mac_destroy_label(label); 750 } 751 752 #ifdef MAC_DEBUG 753 if (error == 0) 754 atomic_add_int(&nmacsockets, 1); 755 #endif 756 757 return (error); 758 } 759 760 static int 761 mac_init_socket_peer_label(struct label *label, int flag) 762 { 763 int error; 764 765 mac_init_label(label); 766 767 MAC_CHECK(init_socket_peer_label, label, flag); 768 if (error) { 769 MAC_PERFORM(destroy_socket_label, label); 770 mac_destroy_label(label); 771 } 772 773 return (error); 774 } 775 776 int 777 mac_init_socket(struct socket *socket, int flag) 778 { 779 int error; 780 781 error = mac_init_socket_label(&socket->so_label, flag); 782 if (error) 783 return (error); 784 785 error = mac_init_socket_peer_label(&socket->so_peerlabel, flag); 786 if (error) 787 mac_destroy_socket_label(&socket->so_label); 788 789 return (error); 790 } 791 792 void 793 mac_init_vnode_label(struct label *label) 794 { 795 796 mac_init_label(label); 797 MAC_PERFORM(init_vnode_label, label); 798 #ifdef MAC_DEBUG 799 atomic_add_int(&nmacvnodes, 1); 800 #endif 801 } 802 803 void 804 mac_init_vnode(struct vnode *vp) 805 { 806 807 mac_init_vnode_label(&vp->v_label); 808 } 809 810 void 811 mac_destroy_bpfdesc(struct bpf_d *bpf_d) 812 { 813 814 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label); 815 mac_destroy_label(&bpf_d->bd_label); 816 #ifdef MAC_DEBUG 817 atomic_subtract_int(&nmacbpfdescs, 1); 818 #endif 819 } 820 821 static void 822 mac_destroy_cred_label(struct label *label) 823 { 824 825 MAC_PERFORM(destroy_cred_label, label); 826 mac_destroy_label(label); 827 #ifdef MAC_DEBUG 828 atomic_subtract_int(&nmaccreds, 1); 829 #endif 830 } 831 832 void 833 mac_destroy_cred(struct ucred *cred) 834 { 835 836 mac_destroy_cred_label(&cred->cr_label); 837 } 838 839 void 840 mac_destroy_devfsdirent(struct devfs_dirent *de) 841 { 842 843 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label); 844 mac_destroy_label(&de->de_label); 845 #ifdef MAC_DEBUG 846 atomic_subtract_int(&nmacdevfsdirents, 1); 847 #endif 848 } 849 850 static void 851 mac_destroy_ifnet_label(struct label *label) 852 { 853 854 MAC_PERFORM(destroy_ifnet_label, label); 855 mac_destroy_label(label); 856 #ifdef MAC_DEBUG 857 atomic_subtract_int(&nmacifnets, 1); 858 #endif 859 } 860 861 void 862 mac_destroy_ifnet(struct ifnet *ifp) 863 { 864 865 mac_destroy_ifnet_label(&ifp->if_label); 866 } 867 868 void 869 mac_destroy_ipq(struct ipq *ipq) 870 { 871 872 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label); 873 mac_destroy_label(&ipq->ipq_label); 874 #ifdef MAC_DEBUG 875 atomic_subtract_int(&nmacipqs, 1); 876 #endif 877 } 878 879 void 880 mac_destroy_mbuf(struct mbuf *m) 881 { 882 883 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label); 884 mac_destroy_label(&m->m_pkthdr.label); 885 #ifdef MAC_DEBUG 886 atomic_subtract_int(&nmacmbufs, 1); 887 #endif 888 } 889 890 void 891 mac_destroy_mount(struct mount *mp) 892 { 893 894 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel); 895 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel); 896 mac_destroy_label(&mp->mnt_fslabel); 897 mac_destroy_label(&mp->mnt_mntlabel); 898 #ifdef MAC_DEBUG 899 atomic_subtract_int(&nmacmounts, 1); 900 #endif 901 } 902 903 static void 904 mac_destroy_pipe_label(struct label *label) 905 { 906 907 MAC_PERFORM(destroy_pipe_label, label); 908 mac_destroy_label(label); 909 #ifdef MAC_DEBUG 910 atomic_subtract_int(&nmacpipes, 1); 911 #endif 912 } 913 914 void 915 mac_destroy_pipe(struct pipe *pipe) 916 { 917 918 mac_destroy_pipe_label(pipe->pipe_label); 919 free(pipe->pipe_label, M_MACPIPELABEL); 920 } 921 922 static void 923 mac_destroy_socket_label(struct label *label) 924 { 925 926 MAC_PERFORM(destroy_socket_label, label); 927 mac_destroy_label(label); 928 #ifdef MAC_DEBUG 929 atomic_subtract_int(&nmacsockets, 1); 930 #endif 931 } 932 933 static void 934 mac_destroy_socket_peer_label(struct label *label) 935 { 936 937 MAC_PERFORM(destroy_socket_peer_label, label); 938 mac_destroy_label(label); 939 } 940 941 void 942 mac_destroy_socket(struct socket *socket) 943 { 944 945 mac_destroy_socket_label(&socket->so_label); 946 mac_destroy_socket_peer_label(&socket->so_peerlabel); 947 } 948 949 void 950 mac_destroy_vnode_label(struct label *label) 951 { 952 953 MAC_PERFORM(destroy_vnode_label, label); 954 mac_destroy_label(label); 955 #ifdef MAC_DEBUG 956 atomic_subtract_int(&nmacvnodes, 1); 957 #endif 958 } 959 960 void 961 mac_destroy_vnode(struct vnode *vp) 962 { 963 964 mac_destroy_vnode_label(&vp->v_label); 965 } 966 967 static void 968 mac_copy_pipe_label(struct label *src, struct label *dest) 969 { 970 971 MAC_PERFORM(copy_pipe_label, src, dest); 972 } 973 974 void 975 mac_copy_vnode_label(struct label *src, struct label *dest) 976 { 977 978 MAC_PERFORM(copy_vnode_label, src, dest); 979 } 980 981 static int 982 mac_check_structmac_consistent(struct mac *mac) 983 { 984 985 if (mac->m_buflen > MAC_MAX_LABEL_BUF_LEN) 986 return (EINVAL); 987 988 return (0); 989 } 990 991 static int 992 mac_externalize_cred_label(struct label *label, char *elements, 993 char *outbuf, size_t outbuflen, int flags) 994 { 995 int error; 996 997 MAC_EXTERNALIZE(cred_label, label, elements, outbuf, outbuflen); 998 999 return (error); 1000 } 1001 1002 static int 1003 mac_externalize_ifnet_label(struct label *label, char *elements, 1004 char *outbuf, size_t outbuflen, int flags) 1005 { 1006 int error; 1007 1008 MAC_EXTERNALIZE(ifnet_label, label, elements, outbuf, outbuflen); 1009 1010 return (error); 1011 } 1012 1013 static int 1014 mac_externalize_pipe_label(struct label *label, char *elements, 1015 char *outbuf, size_t outbuflen, int flags) 1016 { 1017 int error; 1018 1019 MAC_EXTERNALIZE(pipe_label, label, elements, outbuf, outbuflen); 1020 1021 return (error); 1022 } 1023 1024 static int 1025 mac_externalize_socket_label(struct label *label, char *elements, 1026 char *outbuf, size_t outbuflen, int flags) 1027 { 1028 int error; 1029 1030 MAC_EXTERNALIZE(socket_label, label, elements, outbuf, outbuflen); 1031 1032 return (error); 1033 } 1034 1035 static int 1036 mac_externalize_socket_peer_label(struct label *label, char *elements, 1037 char *outbuf, size_t outbuflen, int flags) 1038 { 1039 int error; 1040 1041 MAC_EXTERNALIZE(socket_peer_label, label, elements, outbuf, outbuflen); 1042 1043 return (error); 1044 } 1045 1046 static int 1047 mac_externalize_vnode_label(struct label *label, char *elements, 1048 char *outbuf, size_t outbuflen, int flags) 1049 { 1050 int error; 1051 1052 MAC_EXTERNALIZE(vnode_label, label, elements, outbuf, outbuflen); 1053 1054 return (error); 1055 } 1056 1057 static int 1058 mac_internalize_cred_label(struct label *label, char *string) 1059 { 1060 int error; 1061 1062 MAC_INTERNALIZE(cred_label, label, string); 1063 1064 return (error); 1065 } 1066 1067 static int 1068 mac_internalize_ifnet_label(struct label *label, char *string) 1069 { 1070 int error; 1071 1072 MAC_INTERNALIZE(ifnet_label, label, string); 1073 1074 return (error); 1075 } 1076 1077 static int 1078 mac_internalize_pipe_label(struct label *label, char *string) 1079 { 1080 int error; 1081 1082 MAC_INTERNALIZE(pipe_label, label, string); 1083 1084 return (error); 1085 } 1086 1087 static int 1088 mac_internalize_socket_label(struct label *label, char *string) 1089 { 1090 int error; 1091 1092 MAC_INTERNALIZE(socket_label, label, string); 1093 1094 return (error); 1095 } 1096 1097 static int 1098 mac_internalize_vnode_label(struct label *label, char *string) 1099 { 1100 int error; 1101 1102 MAC_INTERNALIZE(vnode_label, label, string); 1103 1104 return (error); 1105 } 1106 1107 /* 1108 * Initialize MAC label for the first kernel process, from which other 1109 * kernel processes and threads are spawned. 1110 */ 1111 void 1112 mac_create_proc0(struct ucred *cred) 1113 { 1114 1115 MAC_PERFORM(create_proc0, cred); 1116 } 1117 1118 /* 1119 * Initialize MAC label for the first userland process, from which other 1120 * userland processes and threads are spawned. 1121 */ 1122 void 1123 mac_create_proc1(struct ucred *cred) 1124 { 1125 1126 MAC_PERFORM(create_proc1, cred); 1127 } 1128 1129 void 1130 mac_thread_userret(struct thread *td) 1131 { 1132 1133 MAC_PERFORM(thread_userret, td); 1134 } 1135 1136 /* 1137 * When a new process is created, its label must be initialized. Generally, 1138 * this involves inheritence from the parent process, modulo possible 1139 * deltas. This function allows that processing to take place. 1140 */ 1141 void 1142 mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred) 1143 { 1144 1145 MAC_PERFORM(create_cred, parent_cred, child_cred); 1146 } 1147 1148 void 1149 mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp) 1150 { 1151 1152 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label); 1153 } 1154 1155 void 1156 mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de, 1157 struct vnode *vp) 1158 { 1159 1160 MAC_PERFORM(associate_vnode_devfs, mp, &mp->mnt_fslabel, de, 1161 &de->de_label, vp, &vp->v_label); 1162 } 1163 1164 int 1165 mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp) 1166 { 1167 int error; 1168 1169 ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr"); 1170 1171 MAC_CHECK(associate_vnode_extattr, mp, &mp->mnt_fslabel, vp, 1172 &vp->v_label); 1173 1174 return (error); 1175 } 1176 1177 void 1178 mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp) 1179 { 1180 1181 MAC_PERFORM(associate_vnode_singlelabel, mp, &mp->mnt_fslabel, vp, 1182 &vp->v_label); 1183 } 1184 1185 int 1186 mac_create_vnode_extattr(struct ucred *cred, struct mount *mp, 1187 struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 1188 { 1189 int error; 1190 1191 ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr"); 1192 ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr"); 1193 1194 error = VOP_OPENEXTATTR(vp, cred, curthread); 1195 if (error == EOPNOTSUPP) { 1196 /* XXX: Optionally abort if transactions not supported. */ 1197 if (ea_warn_once == 0) { 1198 printf("Warning: transactions not supported " 1199 "in EA write.\n"); 1200 ea_warn_once = 1; 1201 } 1202 } else if (error) 1203 return (error); 1204 1205 MAC_CHECK(create_vnode_extattr, cred, mp, &mp->mnt_fslabel, 1206 dvp, &dvp->v_label, vp, &vp->v_label, cnp); 1207 1208 if (error) { 1209 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 1210 return (error); 1211 } 1212 1213 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 1214 1215 if (error == EOPNOTSUPP) 1216 error = 0; /* XXX */ 1217 1218 return (error); 1219 } 1220 1221 static int 1222 mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 1223 struct label *intlabel) 1224 { 1225 int error; 1226 1227 ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr"); 1228 1229 error = VOP_OPENEXTATTR(vp, cred, curthread); 1230 if (error == EOPNOTSUPP) { 1231 /* XXX: Optionally abort if transactions not supported. */ 1232 if (ea_warn_once == 0) { 1233 printf("Warning: transactions not supported " 1234 "in EA write.\n"); 1235 ea_warn_once = 1; 1236 } 1237 } else if (error) 1238 return (error); 1239 1240 MAC_CHECK(setlabel_vnode_extattr, cred, vp, &vp->v_label, intlabel); 1241 1242 if (error) { 1243 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 1244 return (error); 1245 } 1246 1247 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 1248 1249 if (error == EOPNOTSUPP) 1250 error = 0; /* XXX */ 1251 1252 return (error); 1253 } 1254 1255 int 1256 mac_execve_enter(struct image_params *imgp, struct mac *mac_p, 1257 struct label *execlabelstorage) 1258 { 1259 struct mac mac; 1260 char *buffer; 1261 int error; 1262 1263 if (mac_p == NULL) 1264 return (0); 1265 1266 error = copyin(mac_p, &mac, sizeof(mac)); 1267 if (error) 1268 return (error); 1269 1270 error = mac_check_structmac_consistent(&mac); 1271 if (error) 1272 return (error); 1273 1274 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 1275 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 1276 if (error) { 1277 free(buffer, M_MACTEMP); 1278 return (error); 1279 } 1280 1281 mac_init_cred_label(execlabelstorage); 1282 error = mac_internalize_cred_label(execlabelstorage, buffer); 1283 free(buffer, M_MACTEMP); 1284 if (error) { 1285 mac_destroy_cred_label(execlabelstorage); 1286 return (error); 1287 } 1288 imgp->execlabel = execlabelstorage; 1289 return (0); 1290 } 1291 1292 void 1293 mac_execve_exit(struct image_params *imgp) 1294 { 1295 if (imgp->execlabel != NULL) 1296 mac_destroy_cred_label(imgp->execlabel); 1297 } 1298 1299 void 1300 mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, 1301 struct label *interpvnodelabel, struct image_params *imgp) 1302 { 1303 1304 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 1305 1306 if (!mac_enforce_process && !mac_enforce_fs) 1307 return; 1308 1309 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label, 1310 interpvnodelabel, imgp); 1311 } 1312 1313 int 1314 mac_execve_will_transition(struct ucred *old, struct vnode *vp, 1315 struct label *interpvnodelabel, struct image_params *imgp) 1316 { 1317 int result; 1318 1319 ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition"); 1320 1321 if (!mac_enforce_process && !mac_enforce_fs) 1322 return (0); 1323 1324 result = 0; 1325 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label, 1326 interpvnodelabel, imgp); 1327 1328 return (result); 1329 } 1330 1331 int 1332 mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode) 1333 { 1334 int error; 1335 1336 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 1337 1338 if (!mac_enforce_fs) 1339 return (0); 1340 1341 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, acc_mode); 1342 return (error); 1343 } 1344 1345 int 1346 mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 1347 { 1348 int error; 1349 1350 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 1351 1352 if (!mac_enforce_fs) 1353 return (0); 1354 1355 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label); 1356 return (error); 1357 } 1358 1359 int 1360 mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 1361 { 1362 int error; 1363 1364 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 1365 1366 if (!mac_enforce_fs) 1367 return (0); 1368 1369 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label); 1370 return (error); 1371 } 1372 1373 int 1374 mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1375 struct componentname *cnp, struct vattr *vap) 1376 { 1377 int error; 1378 1379 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 1380 1381 if (!mac_enforce_fs) 1382 return (0); 1383 1384 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap); 1385 return (error); 1386 } 1387 1388 int 1389 mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 1390 struct componentname *cnp) 1391 { 1392 int error; 1393 1394 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 1395 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 1396 1397 if (!mac_enforce_fs) 1398 return (0); 1399 1400 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp, 1401 &vp->v_label, cnp); 1402 return (error); 1403 } 1404 1405 int 1406 mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1407 acl_type_t type) 1408 { 1409 int error; 1410 1411 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 1412 1413 if (!mac_enforce_fs) 1414 return (0); 1415 1416 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type); 1417 return (error); 1418 } 1419 1420 int 1421 mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 1422 struct image_params *imgp) 1423 { 1424 int error; 1425 1426 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 1427 1428 if (!mac_enforce_process && !mac_enforce_fs) 1429 return (0); 1430 1431 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label, imgp); 1432 1433 return (error); 1434 } 1435 1436 int 1437 mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 1438 { 1439 int error; 1440 1441 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 1442 1443 if (!mac_enforce_fs) 1444 return (0); 1445 1446 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); 1447 return (error); 1448 } 1449 1450 int 1451 mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1452 int attrnamespace, const char *name, struct uio *uio) 1453 { 1454 int error; 1455 1456 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 1457 1458 if (!mac_enforce_fs) 1459 return (0); 1460 1461 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, 1462 attrnamespace, name, uio); 1463 return (error); 1464 } 1465 1466 int 1467 mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 1468 struct vnode *vp, struct componentname *cnp) 1469 { 1470 int error; 1471 1472 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 1473 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 1474 1475 if (!mac_enforce_fs) 1476 return (0); 1477 1478 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp, 1479 &vp->v_label, cnp); 1480 return (error); 1481 } 1482 1483 int 1484 mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 1485 struct componentname *cnp) 1486 { 1487 int error; 1488 1489 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 1490 1491 if (!mac_enforce_fs) 1492 return (0); 1493 1494 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); 1495 return (error); 1496 } 1497 1498 int 1499 mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot) 1500 { 1501 int error; 1502 1503 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 1504 1505 if (!mac_enforce_fs || !mac_enforce_vm) 1506 return (0); 1507 1508 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot); 1509 return (error); 1510 } 1511 1512 void 1513 mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 1514 { 1515 int result = *prot; 1516 1517 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 1518 1519 if (!mac_enforce_fs || !mac_enforce_vm) 1520 return; 1521 1522 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label, 1523 &result); 1524 1525 *prot = result; 1526 } 1527 1528 int 1529 mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 1530 { 1531 int error; 1532 1533 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 1534 1535 if (!mac_enforce_fs || !mac_enforce_vm) 1536 return (0); 1537 1538 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot); 1539 return (error); 1540 } 1541 1542 int 1543 mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 1544 { 1545 int error; 1546 1547 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 1548 1549 if (!mac_enforce_fs) 1550 return (0); 1551 1552 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); 1553 return (error); 1554 } 1555 1556 int 1557 mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 1558 struct vnode *vp) 1559 { 1560 int error; 1561 1562 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 1563 1564 if (!mac_enforce_fs) 1565 return (0); 1566 1567 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 1568 &vp->v_label); 1569 1570 return (error); 1571 } 1572 1573 int 1574 mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 1575 struct vnode *vp) 1576 { 1577 int error; 1578 1579 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 1580 1581 if (!mac_enforce_fs) 1582 return (0); 1583 1584 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 1585 &vp->v_label); 1586 1587 return (error); 1588 } 1589 1590 int 1591 mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 1592 { 1593 int error; 1594 1595 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 1596 1597 if (!mac_enforce_fs) 1598 return (0); 1599 1600 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); 1601 return (error); 1602 } 1603 1604 int 1605 mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 1606 { 1607 int error; 1608 1609 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 1610 1611 if (!mac_enforce_fs) 1612 return (0); 1613 1614 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); 1615 return (error); 1616 } 1617 1618 static int 1619 mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 1620 struct label *newlabel) 1621 { 1622 int error; 1623 1624 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 1625 1626 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); 1627 1628 return (error); 1629 } 1630 1631 int 1632 mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 1633 struct vnode *vp, struct componentname *cnp) 1634 { 1635 int error; 1636 1637 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 1638 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 1639 1640 if (!mac_enforce_fs) 1641 return (0); 1642 1643 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, 1644 &vp->v_label, cnp); 1645 return (error); 1646 } 1647 1648 int 1649 mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 1650 struct vnode *vp, int samedir, struct componentname *cnp) 1651 { 1652 int error; 1653 1654 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 1655 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 1656 1657 if (!mac_enforce_fs) 1658 return (0); 1659 1660 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, 1661 vp != NULL ? &vp->v_label : NULL, samedir, cnp); 1662 return (error); 1663 } 1664 1665 int 1666 mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 1667 { 1668 int error; 1669 1670 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 1671 1672 if (!mac_enforce_fs) 1673 return (0); 1674 1675 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); 1676 return (error); 1677 } 1678 1679 int 1680 mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 1681 struct acl *acl) 1682 { 1683 int error; 1684 1685 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 1686 1687 if (!mac_enforce_fs) 1688 return (0); 1689 1690 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); 1691 return (error); 1692 } 1693 1694 int 1695 mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 1696 int attrnamespace, const char *name, struct uio *uio) 1697 { 1698 int error; 1699 1700 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 1701 1702 if (!mac_enforce_fs) 1703 return (0); 1704 1705 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, 1706 attrnamespace, name, uio); 1707 return (error); 1708 } 1709 1710 int 1711 mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 1712 { 1713 int error; 1714 1715 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 1716 1717 if (!mac_enforce_fs) 1718 return (0); 1719 1720 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); 1721 return (error); 1722 } 1723 1724 int 1725 mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 1726 { 1727 int error; 1728 1729 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 1730 1731 if (!mac_enforce_fs) 1732 return (0); 1733 1734 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); 1735 return (error); 1736 } 1737 1738 int 1739 mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 1740 gid_t gid) 1741 { 1742 int error; 1743 1744 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 1745 1746 if (!mac_enforce_fs) 1747 return (0); 1748 1749 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); 1750 return (error); 1751 } 1752 1753 int 1754 mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 1755 struct timespec atime, struct timespec mtime) 1756 { 1757 int error; 1758 1759 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 1760 1761 if (!mac_enforce_fs) 1762 return (0); 1763 1764 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, 1765 mtime); 1766 return (error); 1767 } 1768 1769 int 1770 mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 1771 struct vnode *vp) 1772 { 1773 int error; 1774 1775 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 1776 1777 if (!mac_enforce_fs) 1778 return (0); 1779 1780 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 1781 &vp->v_label); 1782 return (error); 1783 } 1784 1785 int 1786 mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 1787 struct vnode *vp) 1788 { 1789 int error; 1790 1791 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 1792 1793 if (!mac_enforce_fs) 1794 return (0); 1795 1796 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 1797 &vp->v_label); 1798 1799 return (error); 1800 } 1801 1802 /* 1803 * When relabeling a process, call out to the policies for the maximum 1804 * permission allowed for each object type we know about in its 1805 * memory space, and revoke access (in the least surprising ways we 1806 * know) when necessary. The process lock is not held here. 1807 */ 1808 static void 1809 mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) 1810 { 1811 1812 /* XXX freeze all other threads */ 1813 mac_cred_mmapped_drop_perms_recurse(td, cred, 1814 &td->td_proc->p_vmspace->vm_map); 1815 /* XXX allow other threads to continue */ 1816 } 1817 1818 static __inline const char * 1819 prot2str(vm_prot_t prot) 1820 { 1821 1822 switch (prot & VM_PROT_ALL) { 1823 case VM_PROT_READ: 1824 return ("r--"); 1825 case VM_PROT_READ | VM_PROT_WRITE: 1826 return ("rw-"); 1827 case VM_PROT_READ | VM_PROT_EXECUTE: 1828 return ("r-x"); 1829 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 1830 return ("rwx"); 1831 case VM_PROT_WRITE: 1832 return ("-w-"); 1833 case VM_PROT_EXECUTE: 1834 return ("--x"); 1835 case VM_PROT_WRITE | VM_PROT_EXECUTE: 1836 return ("-wx"); 1837 default: 1838 return ("---"); 1839 } 1840 } 1841 1842 static void 1843 mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, 1844 struct vm_map *map) 1845 { 1846 struct vm_map_entry *vme; 1847 int result; 1848 vm_prot_t revokeperms; 1849 vm_object_t object; 1850 vm_ooffset_t offset; 1851 struct vnode *vp; 1852 1853 if (!mac_mmap_revocation) 1854 return; 1855 1856 vm_map_lock_read(map); 1857 for (vme = map->header.next; vme != &map->header; vme = vme->next) { 1858 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { 1859 mac_cred_mmapped_drop_perms_recurse(td, cred, 1860 vme->object.sub_map); 1861 continue; 1862 } 1863 /* 1864 * Skip over entries that obviously are not shared. 1865 */ 1866 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || 1867 !vme->max_protection) 1868 continue; 1869 /* 1870 * Drill down to the deepest backing object. 1871 */ 1872 offset = vme->offset; 1873 object = vme->object.vm_object; 1874 if (object == NULL) 1875 continue; 1876 while (object->backing_object != NULL) { 1877 object = object->backing_object; 1878 offset += object->backing_object_offset; 1879 } 1880 /* 1881 * At the moment, vm_maps and objects aren't considered 1882 * by the MAC system, so only things with backing by a 1883 * normal object (read: vnodes) are checked. 1884 */ 1885 if (object->type != OBJT_VNODE) 1886 continue; 1887 vp = (struct vnode *)object->handle; 1888 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1889 result = vme->max_protection; 1890 mac_check_vnode_mmap_downgrade(cred, vp, &result); 1891 VOP_UNLOCK(vp, 0, td); 1892 /* 1893 * Find out what maximum protection we may be allowing 1894 * now but a policy needs to get removed. 1895 */ 1896 revokeperms = vme->max_protection & ~result; 1897 if (!revokeperms) 1898 continue; 1899 printf("pid %ld: revoking %s perms from %#lx:%ld " 1900 "(max %s/cur %s)\n", (long)td->td_proc->p_pid, 1901 prot2str(revokeperms), (u_long)vme->start, 1902 (long)(vme->end - vme->start), 1903 prot2str(vme->max_protection), prot2str(vme->protection)); 1904 vm_map_lock_upgrade(map); 1905 /* 1906 * This is the really simple case: if a map has more 1907 * max_protection than is allowed, but it's not being 1908 * actually used (that is, the current protection is 1909 * still allowed), we can just wipe it out and do 1910 * nothing more. 1911 */ 1912 if ((vme->protection & revokeperms) == 0) { 1913 vme->max_protection -= revokeperms; 1914 } else { 1915 if (revokeperms & VM_PROT_WRITE) { 1916 /* 1917 * In the more complicated case, flush out all 1918 * pending changes to the object then turn it 1919 * copy-on-write. 1920 */ 1921 vm_object_reference(object); 1922 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1923 vm_object_page_clean(object, 1924 OFF_TO_IDX(offset), 1925 OFF_TO_IDX(offset + vme->end - vme->start + 1926 PAGE_MASK), 1927 OBJPC_SYNC); 1928 VOP_UNLOCK(vp, 0, td); 1929 vm_object_deallocate(object); 1930 /* 1931 * Why bother if there's no read permissions 1932 * anymore? For the rest, we need to leave 1933 * the write permissions on for COW, or 1934 * remove them entirely if configured to. 1935 */ 1936 if (!mac_mmap_revocation_via_cow) { 1937 vme->max_protection &= ~VM_PROT_WRITE; 1938 vme->protection &= ~VM_PROT_WRITE; 1939 } if ((revokeperms & VM_PROT_READ) == 0) 1940 vme->eflags |= MAP_ENTRY_COW | 1941 MAP_ENTRY_NEEDS_COPY; 1942 } 1943 if (revokeperms & VM_PROT_EXECUTE) { 1944 vme->max_protection &= ~VM_PROT_EXECUTE; 1945 vme->protection &= ~VM_PROT_EXECUTE; 1946 } 1947 if (revokeperms & VM_PROT_READ) { 1948 vme->max_protection = 0; 1949 vme->protection = 0; 1950 } 1951 pmap_protect(map->pmap, vme->start, vme->end, 1952 vme->protection & ~revokeperms); 1953 vm_map_simplify_entry(map, vme); 1954 } 1955 vm_map_lock_downgrade(map); 1956 } 1957 vm_map_unlock_read(map); 1958 } 1959 1960 /* 1961 * When the subject's label changes, it may require revocation of privilege 1962 * to mapped objects. This can't be done on-the-fly later with a unified 1963 * buffer cache. 1964 */ 1965 static void 1966 mac_relabel_cred(struct ucred *cred, struct label *newlabel) 1967 { 1968 1969 MAC_PERFORM(relabel_cred, cred, newlabel); 1970 } 1971 1972 void 1973 mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 1974 { 1975 1976 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); 1977 } 1978 1979 void 1980 mac_create_ifnet(struct ifnet *ifnet) 1981 { 1982 1983 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label); 1984 } 1985 1986 void 1987 mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d) 1988 { 1989 1990 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label); 1991 } 1992 1993 void 1994 mac_create_socket(struct ucred *cred, struct socket *socket) 1995 { 1996 1997 MAC_PERFORM(create_socket, cred, socket, &socket->so_label); 1998 } 1999 2000 void 2001 mac_create_pipe(struct ucred *cred, struct pipe *pipe) 2002 { 2003 2004 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); 2005 } 2006 2007 void 2008 mac_create_socket_from_socket(struct socket *oldsocket, 2009 struct socket *newsocket) 2010 { 2011 2012 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label, 2013 newsocket, &newsocket->so_label); 2014 } 2015 2016 static void 2017 mac_relabel_socket(struct ucred *cred, struct socket *socket, 2018 struct label *newlabel) 2019 { 2020 2021 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); 2022 } 2023 2024 static void 2025 mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) 2026 { 2027 2028 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); 2029 } 2030 2031 void 2032 mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) 2033 { 2034 2035 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label, 2036 socket, &socket->so_peerlabel); 2037 } 2038 2039 void 2040 mac_set_socket_peer_from_socket(struct socket *oldsocket, 2041 struct socket *newsocket) 2042 { 2043 2044 MAC_PERFORM(set_socket_peer_from_socket, oldsocket, 2045 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel); 2046 } 2047 2048 void 2049 mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram) 2050 { 2051 2052 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label, 2053 datagram, &datagram->m_pkthdr.label); 2054 } 2055 2056 void 2057 mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment) 2058 { 2059 2060 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label, 2061 fragment, &fragment->m_pkthdr.label); 2062 } 2063 2064 void 2065 mac_create_ipq(struct mbuf *fragment, struct ipq *ipq) 2066 { 2067 2068 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq, 2069 &ipq->ipq_label); 2070 } 2071 2072 void 2073 mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2074 { 2075 2076 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label, 2077 newmbuf, &newmbuf->m_pkthdr.label); 2078 } 2079 2080 void 2081 mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf) 2082 { 2083 2084 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf, 2085 &mbuf->m_pkthdr.label); 2086 } 2087 2088 void 2089 mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf) 2090 { 2091 2092 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf, 2093 &mbuf->m_pkthdr.label); 2094 } 2095 2096 void 2097 mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf) 2098 { 2099 2100 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf, 2101 &mbuf->m_pkthdr.label); 2102 } 2103 2104 void 2105 mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet, 2106 struct mbuf *newmbuf) 2107 { 2108 2109 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, 2110 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf, 2111 &newmbuf->m_pkthdr.label); 2112 } 2113 2114 void 2115 mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2116 { 2117 2118 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label, 2119 newmbuf, &newmbuf->m_pkthdr.label); 2120 } 2121 2122 int 2123 mac_fragment_match(struct mbuf *fragment, struct ipq *ipq) 2124 { 2125 int result; 2126 2127 result = 1; 2128 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label, 2129 ipq, &ipq->ipq_label); 2130 2131 return (result); 2132 } 2133 2134 void 2135 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq) 2136 { 2137 2138 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq, 2139 &ipq->ipq_label); 2140 } 2141 2142 void 2143 mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) 2144 { 2145 2146 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf, 2147 &mbuf->m_pkthdr.label); 2148 } 2149 2150 void 2151 mac_create_mount(struct ucred *cred, struct mount *mp) 2152 { 2153 2154 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, 2155 &mp->mnt_fslabel); 2156 } 2157 2158 void 2159 mac_create_root_mount(struct ucred *cred, struct mount *mp) 2160 { 2161 2162 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, 2163 &mp->mnt_fslabel); 2164 } 2165 2166 int 2167 mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) 2168 { 2169 int error; 2170 2171 if (!mac_enforce_network) 2172 return (0); 2173 2174 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet, 2175 &ifnet->if_label); 2176 2177 return (error); 2178 } 2179 2180 static int 2181 mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) 2182 { 2183 int error; 2184 2185 MAC_CHECK(check_cred_relabel, cred, newlabel); 2186 2187 return (error); 2188 } 2189 2190 int 2191 mac_check_cred_visible(struct ucred *u1, struct ucred *u2) 2192 { 2193 int error; 2194 2195 if (!mac_enforce_process) 2196 return (0); 2197 2198 MAC_CHECK(check_cred_visible, u1, u2); 2199 2200 return (error); 2201 } 2202 2203 int 2204 mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) 2205 { 2206 int error; 2207 2208 if (!mac_enforce_network) 2209 return (0); 2210 2211 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr")); 2212 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED)) 2213 if_printf(ifnet, "not initialized\n"); 2214 2215 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf, 2216 &mbuf->m_pkthdr.label); 2217 2218 return (error); 2219 } 2220 2221 int 2222 mac_check_kenv_dump(struct ucred *cred) 2223 { 2224 int error; 2225 2226 if (!mac_enforce_system) 2227 return (0); 2228 2229 MAC_CHECK(check_kenv_dump, cred); 2230 2231 return (error); 2232 } 2233 2234 int 2235 mac_check_kenv_get(struct ucred *cred, char *name) 2236 { 2237 int error; 2238 2239 if (!mac_enforce_system) 2240 return (0); 2241 2242 MAC_CHECK(check_kenv_get, cred, name); 2243 2244 return (error); 2245 } 2246 2247 int 2248 mac_check_kenv_set(struct ucred *cred, char *name, char *value) 2249 { 2250 int error; 2251 2252 if (!mac_enforce_system) 2253 return (0); 2254 2255 MAC_CHECK(check_kenv_set, cred, name, value); 2256 2257 return (error); 2258 } 2259 2260 int 2261 mac_check_kenv_unset(struct ucred *cred, char *name) 2262 { 2263 int error; 2264 2265 if (!mac_enforce_system) 2266 return (0); 2267 2268 MAC_CHECK(check_kenv_unset, cred, name); 2269 2270 return (error); 2271 } 2272 2273 int 2274 mac_check_mount_stat(struct ucred *cred, struct mount *mount) 2275 { 2276 int error; 2277 2278 if (!mac_enforce_fs) 2279 return (0); 2280 2281 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); 2282 2283 return (error); 2284 } 2285 2286 int 2287 mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, 2288 void *data) 2289 { 2290 int error; 2291 2292 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2293 2294 if (!mac_enforce_pipe) 2295 return (0); 2296 2297 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); 2298 2299 return (error); 2300 } 2301 2302 int 2303 mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) 2304 { 2305 int error; 2306 2307 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2308 2309 if (!mac_enforce_pipe) 2310 return (0); 2311 2312 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); 2313 2314 return (error); 2315 } 2316 2317 int 2318 mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) 2319 { 2320 int error; 2321 2322 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2323 2324 if (!mac_enforce_pipe) 2325 return (0); 2326 2327 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); 2328 2329 return (error); 2330 } 2331 2332 static int 2333 mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 2334 struct label *newlabel) 2335 { 2336 int error; 2337 2338 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2339 2340 if (!mac_enforce_pipe) 2341 return (0); 2342 2343 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); 2344 2345 return (error); 2346 } 2347 2348 int 2349 mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) 2350 { 2351 int error; 2352 2353 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2354 2355 if (!mac_enforce_pipe) 2356 return (0); 2357 2358 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); 2359 2360 return (error); 2361 } 2362 2363 int 2364 mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) 2365 { 2366 int error; 2367 2368 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2369 2370 if (!mac_enforce_pipe) 2371 return (0); 2372 2373 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); 2374 2375 return (error); 2376 } 2377 2378 int 2379 mac_check_proc_debug(struct ucred *cred, struct proc *proc) 2380 { 2381 int error; 2382 2383 PROC_LOCK_ASSERT(proc, MA_OWNED); 2384 2385 if (!mac_enforce_process) 2386 return (0); 2387 2388 MAC_CHECK(check_proc_debug, cred, proc); 2389 2390 return (error); 2391 } 2392 2393 int 2394 mac_check_proc_sched(struct ucred *cred, struct proc *proc) 2395 { 2396 int error; 2397 2398 PROC_LOCK_ASSERT(proc, MA_OWNED); 2399 2400 if (!mac_enforce_process) 2401 return (0); 2402 2403 MAC_CHECK(check_proc_sched, cred, proc); 2404 2405 return (error); 2406 } 2407 2408 int 2409 mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 2410 { 2411 int error; 2412 2413 PROC_LOCK_ASSERT(proc, MA_OWNED); 2414 2415 if (!mac_enforce_process) 2416 return (0); 2417 2418 MAC_CHECK(check_proc_signal, cred, proc, signum); 2419 2420 return (error); 2421 } 2422 2423 int 2424 mac_check_socket_bind(struct ucred *ucred, struct socket *socket, 2425 struct sockaddr *sockaddr) 2426 { 2427 int error; 2428 2429 if (!mac_enforce_socket) 2430 return (0); 2431 2432 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label, 2433 sockaddr); 2434 2435 return (error); 2436 } 2437 2438 int 2439 mac_check_socket_connect(struct ucred *cred, struct socket *socket, 2440 struct sockaddr *sockaddr) 2441 { 2442 int error; 2443 2444 if (!mac_enforce_socket) 2445 return (0); 2446 2447 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label, 2448 sockaddr); 2449 2450 return (error); 2451 } 2452 2453 int 2454 mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf) 2455 { 2456 int error; 2457 2458 if (!mac_enforce_socket) 2459 return (0); 2460 2461 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf, 2462 &mbuf->m_pkthdr.label); 2463 2464 return (error); 2465 } 2466 2467 int 2468 mac_check_socket_listen(struct ucred *cred, struct socket *socket) 2469 { 2470 int error; 2471 2472 if (!mac_enforce_socket) 2473 return (0); 2474 2475 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label); 2476 return (error); 2477 } 2478 2479 int 2480 mac_check_socket_receive(struct ucred *cred, struct socket *so) 2481 { 2482 int error; 2483 2484 if (!mac_enforce_socket) 2485 return (0); 2486 2487 MAC_CHECK(check_socket_receive, cred, so, &so->so_label); 2488 2489 return (error); 2490 } 2491 2492 static int 2493 mac_check_socket_relabel(struct ucred *cred, struct socket *socket, 2494 struct label *newlabel) 2495 { 2496 int error; 2497 2498 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label, 2499 newlabel); 2500 2501 return (error); 2502 } 2503 2504 int 2505 mac_check_socket_send(struct ucred *cred, struct socket *so) 2506 { 2507 int error; 2508 2509 if (!mac_enforce_socket) 2510 return (0); 2511 2512 MAC_CHECK(check_socket_send, cred, so, &so->so_label); 2513 2514 return (error); 2515 } 2516 2517 int 2518 mac_check_socket_visible(struct ucred *cred, struct socket *socket) 2519 { 2520 int error; 2521 2522 if (!mac_enforce_socket) 2523 return (0); 2524 2525 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label); 2526 2527 return (error); 2528 } 2529 2530 int 2531 mac_check_system_acct(struct ucred *cred, struct vnode *vp) 2532 { 2533 int error; 2534 2535 if (vp != NULL) { 2536 ASSERT_VOP_LOCKED(vp, "mac_check_system_acct"); 2537 } 2538 2539 if (!mac_enforce_system) 2540 return (0); 2541 2542 MAC_CHECK(check_system_acct, cred, vp, 2543 vp != NULL ? &vp->v_label : NULL); 2544 2545 return (error); 2546 } 2547 2548 int 2549 mac_check_system_nfsd(struct ucred *cred) 2550 { 2551 int error; 2552 2553 if (!mac_enforce_system) 2554 return (0); 2555 2556 MAC_CHECK(check_system_nfsd, cred); 2557 2558 return (error); 2559 } 2560 2561 int 2562 mac_check_system_reboot(struct ucred *cred, int howto) 2563 { 2564 int error; 2565 2566 if (!mac_enforce_system) 2567 return (0); 2568 2569 MAC_CHECK(check_system_reboot, cred, howto); 2570 2571 return (error); 2572 } 2573 2574 int 2575 mac_check_system_settime(struct ucred *cred) 2576 { 2577 int error; 2578 2579 if (!mac_enforce_system) 2580 return (0); 2581 2582 MAC_CHECK(check_system_settime, cred); 2583 2584 return (error); 2585 } 2586 2587 int 2588 mac_check_system_swapon(struct ucred *cred, struct vnode *vp) 2589 { 2590 int error; 2591 2592 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon"); 2593 2594 if (!mac_enforce_system) 2595 return (0); 2596 2597 MAC_CHECK(check_system_swapon, cred, vp, &vp->v_label); 2598 return (error); 2599 } 2600 2601 int 2602 mac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen, 2603 void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen) 2604 { 2605 int error; 2606 2607 /* 2608 * XXXMAC: We're very much like to assert the SYSCTL_LOCK here, 2609 * but since it's not exported from kern_sysctl.c, we can't. 2610 */ 2611 if (!mac_enforce_system) 2612 return (0); 2613 2614 MAC_CHECK(check_system_sysctl, cred, name, namelen, old, oldlenp, 2615 inkernel, new, newlen); 2616 2617 return (error); 2618 } 2619 2620 int 2621 mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 2622 struct ifnet *ifnet) 2623 { 2624 char *elements, *buffer; 2625 struct mac mac; 2626 int error; 2627 2628 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 2629 if (error) 2630 return (error); 2631 2632 error = mac_check_structmac_consistent(&mac); 2633 if (error) 2634 return (error); 2635 2636 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2637 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 2638 if (error) { 2639 free(elements, M_MACTEMP); 2640 return (error); 2641 } 2642 2643 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 2644 error = mac_externalize_ifnet_label(&ifnet->if_label, elements, 2645 buffer, mac.m_buflen, M_WAITOK); 2646 if (error == 0) 2647 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 2648 2649 free(buffer, M_MACTEMP); 2650 free(elements, M_MACTEMP); 2651 2652 return (error); 2653 } 2654 2655 int 2656 mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 2657 struct ifnet *ifnet) 2658 { 2659 struct label intlabel; 2660 struct mac mac; 2661 char *buffer; 2662 int error; 2663 2664 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 2665 if (error) 2666 return (error); 2667 2668 error = mac_check_structmac_consistent(&mac); 2669 if (error) 2670 return (error); 2671 2672 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2673 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 2674 if (error) { 2675 free(buffer, M_MACTEMP); 2676 return (error); 2677 } 2678 2679 mac_init_ifnet_label(&intlabel); 2680 error = mac_internalize_ifnet_label(&intlabel, buffer); 2681 free(buffer, M_MACTEMP); 2682 if (error) { 2683 mac_destroy_ifnet_label(&intlabel); 2684 return (error); 2685 } 2686 2687 /* 2688 * XXX: Note that this is a redundant privilege check, since 2689 * policies impose this check themselves if required by the 2690 * policy. Eventually, this should go away. 2691 */ 2692 error = suser_cred(cred, 0); 2693 if (error) { 2694 mac_destroy_ifnet_label(&intlabel); 2695 return (error); 2696 } 2697 2698 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label, 2699 &intlabel); 2700 if (error) { 2701 mac_destroy_ifnet_label(&intlabel); 2702 return (error); 2703 } 2704 2705 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel); 2706 2707 mac_destroy_ifnet_label(&intlabel); 2708 return (0); 2709 } 2710 2711 void 2712 mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp) 2713 { 2714 2715 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label); 2716 } 2717 2718 void 2719 mac_create_devfs_device(dev_t dev, struct devfs_dirent *de) 2720 { 2721 2722 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label); 2723 } 2724 2725 void 2726 mac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd, 2727 struct devfs_dirent *de) 2728 { 2729 2730 MAC_PERFORM(create_devfs_symlink, cred, dd, &dd->de_label, de, 2731 &de->de_label); 2732 } 2733 2734 void 2735 mac_create_devfs_directory(char *dirname, int dirnamelen, 2736 struct devfs_dirent *de) 2737 { 2738 2739 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de, 2740 &de->de_label); 2741 } 2742 2743 int 2744 mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 2745 struct mac *mac) 2746 { 2747 struct label intlabel; 2748 char *buffer; 2749 int error; 2750 2751 error = mac_check_structmac_consistent(mac); 2752 if (error) 2753 return (error); 2754 2755 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 2756 error = copyinstr(mac->m_string, buffer, mac->m_buflen, NULL); 2757 if (error) { 2758 free(buffer, M_MACTEMP); 2759 return (error); 2760 } 2761 2762 mac_init_socket_label(&intlabel, M_WAITOK); 2763 error = mac_internalize_socket_label(&intlabel, buffer); 2764 free(buffer, M_MACTEMP); 2765 if (error) { 2766 mac_destroy_socket_label(&intlabel); 2767 return (error); 2768 } 2769 2770 mac_check_socket_relabel(cred, so, &intlabel); 2771 if (error) { 2772 mac_destroy_socket_label(&intlabel); 2773 return (error); 2774 } 2775 2776 mac_relabel_socket(cred, so, &intlabel); 2777 2778 mac_destroy_socket_label(&intlabel); 2779 return (0); 2780 } 2781 2782 int 2783 mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) 2784 { 2785 int error; 2786 2787 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2788 2789 error = mac_check_pipe_relabel(cred, pipe, label); 2790 if (error) 2791 return (error); 2792 2793 mac_relabel_pipe(cred, pipe, label); 2794 2795 return (0); 2796 } 2797 2798 int 2799 mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 2800 struct mac *mac) 2801 { 2802 char *buffer, *elements; 2803 int error; 2804 2805 error = mac_check_structmac_consistent(mac); 2806 if (error) 2807 return (error); 2808 2809 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 2810 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 2811 if (error) { 2812 free(elements, M_MACTEMP); 2813 return (error); 2814 } 2815 2816 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 2817 error = mac_externalize_socket_label(&so->so_label, elements, 2818 buffer, mac->m_buflen, M_WAITOK); 2819 if (error == 0) 2820 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 2821 2822 free(buffer, M_MACTEMP); 2823 free(elements, M_MACTEMP); 2824 2825 return (error); 2826 } 2827 2828 int 2829 mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 2830 struct mac *mac) 2831 { 2832 char *elements, *buffer; 2833 int error; 2834 2835 error = mac_check_structmac_consistent(mac); 2836 if (error) 2837 return (error); 2838 2839 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 2840 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 2841 if (error) { 2842 free(elements, M_MACTEMP); 2843 return (error); 2844 } 2845 2846 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 2847 error = mac_externalize_socket_peer_label(&so->so_peerlabel, 2848 elements, buffer, mac->m_buflen, M_WAITOK); 2849 if (error == 0) 2850 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 2851 2852 free(buffer, M_MACTEMP); 2853 free(elements, M_MACTEMP); 2854 2855 return (error); 2856 } 2857 2858 /* 2859 * Implementation of VOP_SETLABEL() that relies on extended attributes 2860 * to store label data. Can be referenced by filesystems supporting 2861 * extended attributes. 2862 */ 2863 int 2864 vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 2865 { 2866 struct vnode *vp = ap->a_vp; 2867 struct label *intlabel = ap->a_label; 2868 int error; 2869 2870 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 2871 2872 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 2873 return (EOPNOTSUPP); 2874 2875 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); 2876 if (error) 2877 return (error); 2878 2879 mac_relabel_vnode(ap->a_cred, vp, intlabel); 2880 2881 return (0); 2882 } 2883 2884 static int 2885 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 2886 { 2887 int error; 2888 2889 if (vp->v_mount == NULL) { 2890 /* printf("vn_setlabel: null v_mount\n"); */ 2891 if (vp->v_type != VNON) 2892 printf("vn_setlabel: null v_mount with non-VNON\n"); 2893 return (EBADF); 2894 } 2895 2896 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 2897 return (EOPNOTSUPP); 2898 2899 /* 2900 * Multi-phase commit. First check the policies to confirm the 2901 * change is OK. Then commit via the filesystem. Finally, 2902 * update the actual vnode label. Question: maybe the filesystem 2903 * should update the vnode at the end as part of VOP_SETLABEL()? 2904 */ 2905 error = mac_check_vnode_relabel(cred, vp, intlabel); 2906 if (error) 2907 return (error); 2908 2909 /* 2910 * VADMIN provides the opportunity for the filesystem to make 2911 * decisions about who is and is not able to modify labels 2912 * and protections on files. This might not be right. We can't 2913 * assume VOP_SETLABEL() will do it, because we might implement 2914 * that as part of vop_stdsetlabel_ea(). 2915 */ 2916 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 2917 if (error) 2918 return (error); 2919 2920 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 2921 if (error) 2922 return (error); 2923 2924 return (0); 2925 } 2926 2927 int 2928 __mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 2929 { 2930 char *elements, *buffer; 2931 struct mac mac; 2932 struct proc *tproc; 2933 struct ucred *tcred; 2934 int error; 2935 2936 error = copyin(SCARG(uap, mac_p), &mac, sizeof(mac)); 2937 if (error) 2938 return (error); 2939 2940 error = mac_check_structmac_consistent(&mac); 2941 if (error) 2942 return (error); 2943 2944 tproc = pfind(uap->pid); 2945 if (tproc == NULL) 2946 return (ESRCH); 2947 2948 tcred = NULL; /* Satisfy gcc. */ 2949 error = p_cansee(td, tproc); 2950 if (error == 0) 2951 tcred = crhold(tproc->p_ucred); 2952 PROC_UNLOCK(tproc); 2953 if (error) 2954 return (error); 2955 2956 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2957 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 2958 if (error) { 2959 free(elements, M_MACTEMP); 2960 crfree(tcred); 2961 return (error); 2962 } 2963 2964 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 2965 error = mac_externalize_cred_label(&tcred->cr_label, elements, 2966 buffer, mac.m_buflen, M_WAITOK); 2967 if (error == 0) 2968 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 2969 2970 free(buffer, M_MACTEMP); 2971 free(elements, M_MACTEMP); 2972 crfree(tcred); 2973 return (error); 2974 } 2975 2976 /* 2977 * MPSAFE 2978 */ 2979 int 2980 __mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 2981 { 2982 char *elements, *buffer; 2983 struct mac mac; 2984 int error; 2985 2986 error = copyin(uap->mac_p, &mac, sizeof(mac)); 2987 if (error) 2988 return (error); 2989 2990 error = mac_check_structmac_consistent(&mac); 2991 if (error) 2992 return (error); 2993 2994 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2995 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 2996 if (error) { 2997 free(elements, M_MACTEMP); 2998 return (error); 2999 } 3000 3001 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3002 error = mac_externalize_cred_label(&td->td_ucred->cr_label, 3003 elements, buffer, mac.m_buflen, M_WAITOK); 3004 if (error == 0) 3005 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3006 3007 free(buffer, M_MACTEMP); 3008 free(elements, M_MACTEMP); 3009 return (error); 3010 } 3011 3012 /* 3013 * MPSAFE 3014 */ 3015 int 3016 __mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3017 { 3018 struct ucred *newcred, *oldcred; 3019 struct label intlabel; 3020 struct proc *p; 3021 struct mac mac; 3022 char *buffer; 3023 int error; 3024 3025 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3026 if (error) 3027 return (error); 3028 3029 error = mac_check_structmac_consistent(&mac); 3030 if (error) 3031 return (error); 3032 3033 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3034 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3035 if (error) { 3036 free(buffer, M_MACTEMP); 3037 return (error); 3038 } 3039 3040 mac_init_cred_label(&intlabel); 3041 error = mac_internalize_cred_label(&intlabel, buffer); 3042 free(buffer, M_MACTEMP); 3043 if (error) { 3044 mac_destroy_cred_label(&intlabel); 3045 return (error); 3046 } 3047 3048 newcred = crget(); 3049 3050 p = td->td_proc; 3051 PROC_LOCK(p); 3052 oldcred = p->p_ucred; 3053 3054 error = mac_check_cred_relabel(oldcred, &intlabel); 3055 if (error) { 3056 PROC_UNLOCK(p); 3057 crfree(newcred); 3058 goto out; 3059 } 3060 3061 setsugid(p); 3062 crcopy(newcred, oldcred); 3063 mac_relabel_cred(newcred, &intlabel); 3064 p->p_ucred = newcred; 3065 3066 /* 3067 * Grab additional reference for use while revoking mmaps, prior 3068 * to releasing the proc lock and sharing the cred. 3069 */ 3070 crhold(newcred); 3071 PROC_UNLOCK(p); 3072 3073 if (mac_enforce_vm) { 3074 mtx_lock(&Giant); 3075 mac_cred_mmapped_drop_perms(td, newcred); 3076 mtx_unlock(&Giant); 3077 } 3078 3079 crfree(newcred); /* Free revocation reference. */ 3080 crfree(oldcred); 3081 3082 out: 3083 mac_destroy_cred_label(&intlabel); 3084 return (error); 3085 } 3086 3087 /* 3088 * MPSAFE 3089 */ 3090 int 3091 __mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3092 { 3093 char *elements, *buffer; 3094 struct label intlabel; 3095 struct file *fp; 3096 struct mac mac; 3097 struct vnode *vp; 3098 struct pipe *pipe; 3099 short label_type; 3100 int error; 3101 3102 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3103 if (error) 3104 return (error); 3105 3106 error = mac_check_structmac_consistent(&mac); 3107 if (error) 3108 return (error); 3109 3110 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3111 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3112 if (error) { 3113 free(elements, M_MACTEMP); 3114 return (error); 3115 } 3116 3117 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3118 mtx_lock(&Giant); /* VFS */ 3119 error = fget(td, SCARG(uap, fd), &fp); 3120 if (error) 3121 goto out; 3122 3123 label_type = fp->f_type; 3124 switch (fp->f_type) { 3125 case DTYPE_FIFO: 3126 case DTYPE_VNODE: 3127 vp = (struct vnode *)fp->f_data; 3128 3129 mac_init_vnode_label(&intlabel); 3130 3131 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3132 mac_copy_vnode_label(&vp->v_label, &intlabel); 3133 VOP_UNLOCK(vp, 0, td); 3134 3135 break; 3136 case DTYPE_PIPE: 3137 pipe = (struct pipe *)fp->f_data; 3138 3139 mac_init_pipe_label(&intlabel); 3140 3141 PIPE_LOCK(pipe); 3142 mac_copy_pipe_label(pipe->pipe_label, &intlabel); 3143 PIPE_UNLOCK(pipe); 3144 break; 3145 default: 3146 error = EINVAL; 3147 fdrop(fp, td); 3148 goto out; 3149 } 3150 fdrop(fp, td); 3151 3152 switch (label_type) { 3153 case DTYPE_FIFO: 3154 case DTYPE_VNODE: 3155 if (error == 0) 3156 error = mac_externalize_vnode_label(&intlabel, 3157 elements, buffer, mac.m_buflen, M_WAITOK); 3158 mac_destroy_vnode_label(&intlabel); 3159 break; 3160 case DTYPE_PIPE: 3161 error = mac_externalize_pipe_label(&intlabel, elements, 3162 buffer, mac.m_buflen, M_WAITOK); 3163 mac_destroy_pipe_label(&intlabel); 3164 break; 3165 default: 3166 panic("__mac_get_fd: corrupted label_type"); 3167 } 3168 3169 if (error == 0) 3170 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3171 3172 out: 3173 mtx_unlock(&Giant); /* VFS */ 3174 free(buffer, M_MACTEMP); 3175 free(elements, M_MACTEMP); 3176 3177 return (error); 3178 } 3179 3180 /* 3181 * MPSAFE 3182 */ 3183 int 3184 __mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3185 { 3186 char *elements, *buffer; 3187 struct nameidata nd; 3188 struct label intlabel; 3189 struct mac mac; 3190 int error; 3191 3192 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3193 if (error) 3194 return (error); 3195 3196 error = mac_check_structmac_consistent(&mac); 3197 if (error) 3198 return (error); 3199 3200 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3201 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3202 if (error) { 3203 free(elements, M_MACTEMP); 3204 return (error); 3205 } 3206 3207 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3208 mtx_lock(&Giant); /* VFS */ 3209 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3210 td); 3211 error = namei(&nd); 3212 if (error) 3213 goto out; 3214 3215 mac_init_vnode_label(&intlabel); 3216 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3217 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3218 mac.m_buflen, M_WAITOK); 3219 3220 NDFREE(&nd, 0); 3221 mac_destroy_vnode_label(&intlabel); 3222 3223 if (error == 0) 3224 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3225 3226 out: 3227 mtx_unlock(&Giant); /* VFS */ 3228 3229 free(buffer, M_MACTEMP); 3230 free(elements, M_MACTEMP); 3231 3232 return (error); 3233 } 3234 3235 /* 3236 * MPSAFE 3237 */ 3238 int 3239 __mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3240 { 3241 char *elements, *buffer; 3242 struct nameidata nd; 3243 struct label intlabel; 3244 struct mac mac; 3245 int error; 3246 3247 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3248 if (error) 3249 return (error); 3250 3251 error = mac_check_structmac_consistent(&mac); 3252 if (error) 3253 return (error); 3254 3255 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3256 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3257 if (error) { 3258 free(elements, M_MACTEMP); 3259 return (error); 3260 } 3261 3262 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3263 mtx_lock(&Giant); /* VFS */ 3264 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3265 td); 3266 error = namei(&nd); 3267 if (error) 3268 goto out; 3269 3270 mac_init_vnode_label(&intlabel); 3271 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3272 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3273 mac.m_buflen, M_WAITOK); 3274 NDFREE(&nd, 0); 3275 mac_destroy_vnode_label(&intlabel); 3276 3277 if (error == 0) 3278 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3279 3280 out: 3281 mtx_unlock(&Giant); /* VFS */ 3282 3283 free(buffer, M_MACTEMP); 3284 free(elements, M_MACTEMP); 3285 3286 return (error); 3287 } 3288 3289 /* 3290 * MPSAFE 3291 */ 3292 int 3293 __mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3294 { 3295 struct label intlabel; 3296 struct pipe *pipe; 3297 struct file *fp; 3298 struct mount *mp; 3299 struct vnode *vp; 3300 struct mac mac; 3301 char *buffer; 3302 int error; 3303 3304 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3305 if (error) 3306 return (error); 3307 3308 error = mac_check_structmac_consistent(&mac); 3309 if (error) 3310 return (error); 3311 3312 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3313 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3314 if (error) { 3315 free(buffer, M_MACTEMP); 3316 return (error); 3317 } 3318 3319 mtx_lock(&Giant); /* VFS */ 3320 3321 error = fget(td, SCARG(uap, fd), &fp); 3322 if (error) 3323 goto out; 3324 3325 switch (fp->f_type) { 3326 case DTYPE_FIFO: 3327 case DTYPE_VNODE: 3328 mac_init_vnode_label(&intlabel); 3329 error = mac_internalize_vnode_label(&intlabel, buffer); 3330 if (error) { 3331 mac_destroy_vnode_label(&intlabel); 3332 break; 3333 } 3334 3335 vp = (struct vnode *)fp->f_data; 3336 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3337 if (error != 0) { 3338 mac_destroy_vnode_label(&intlabel); 3339 break; 3340 } 3341 3342 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3343 error = vn_setlabel(vp, &intlabel, td->td_ucred); 3344 VOP_UNLOCK(vp, 0, td); 3345 vn_finished_write(mp); 3346 3347 mac_destroy_vnode_label(&intlabel); 3348 break; 3349 3350 case DTYPE_PIPE: 3351 mac_init_pipe_label(&intlabel); 3352 error = mac_internalize_pipe_label(&intlabel, buffer); 3353 if (error == 0) { 3354 pipe = (struct pipe *)fp->f_data; 3355 PIPE_LOCK(pipe); 3356 error = mac_pipe_label_set(td->td_ucred, pipe, 3357 &intlabel); 3358 PIPE_UNLOCK(pipe); 3359 } 3360 3361 mac_destroy_pipe_label(&intlabel); 3362 break; 3363 3364 default: 3365 error = EINVAL; 3366 } 3367 3368 fdrop(fp, td); 3369 out: 3370 mtx_unlock(&Giant); /* VFS */ 3371 3372 free(buffer, M_MACTEMP); 3373 3374 return (error); 3375 } 3376 3377 /* 3378 * MPSAFE 3379 */ 3380 int 3381 __mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3382 { 3383 struct label intlabel; 3384 struct nameidata nd; 3385 struct mount *mp; 3386 struct mac mac; 3387 char *buffer; 3388 int error; 3389 3390 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3391 if (error) 3392 return (error); 3393 3394 error = mac_check_structmac_consistent(&mac); 3395 if (error) 3396 return (error); 3397 3398 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3399 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3400 if (error) { 3401 free(buffer, M_MACTEMP); 3402 return (error); 3403 } 3404 3405 mac_init_vnode_label(&intlabel); 3406 error = mac_internalize_vnode_label(&intlabel, buffer); 3407 free(buffer, M_MACTEMP); 3408 if (error) { 3409 mac_destroy_vnode_label(&intlabel); 3410 return (error); 3411 } 3412 3413 mtx_lock(&Giant); /* VFS */ 3414 3415 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3416 td); 3417 error = namei(&nd); 3418 if (error == 0) { 3419 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3420 if (error == 0) 3421 error = vn_setlabel(nd.ni_vp, &intlabel, 3422 td->td_ucred); 3423 vn_finished_write(mp); 3424 } 3425 3426 NDFREE(&nd, 0); 3427 mtx_unlock(&Giant); /* VFS */ 3428 mac_destroy_vnode_label(&intlabel); 3429 3430 return (error); 3431 } 3432 3433 /* 3434 * MPSAFE 3435 */ 3436 int 3437 __mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3438 { 3439 struct label intlabel; 3440 struct nameidata nd; 3441 struct mount *mp; 3442 struct mac mac; 3443 char *buffer; 3444 int error; 3445 3446 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3447 if (error) 3448 return (error); 3449 3450 error = mac_check_structmac_consistent(&mac); 3451 if (error) 3452 return (error); 3453 3454 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3455 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3456 if (error) { 3457 free(buffer, M_MACTEMP); 3458 return (error); 3459 } 3460 3461 mac_init_vnode_label(&intlabel); 3462 error = mac_internalize_vnode_label(&intlabel, buffer); 3463 free(buffer, M_MACTEMP); 3464 if (error) { 3465 mac_destroy_vnode_label(&intlabel); 3466 return (error); 3467 } 3468 3469 mtx_lock(&Giant); /* VFS */ 3470 3471 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3472 td); 3473 error = namei(&nd); 3474 if (error == 0) { 3475 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3476 if (error == 0) 3477 error = vn_setlabel(nd.ni_vp, &intlabel, 3478 td->td_ucred); 3479 vn_finished_write(mp); 3480 } 3481 3482 NDFREE(&nd, 0); 3483 mtx_unlock(&Giant); /* VFS */ 3484 mac_destroy_vnode_label(&intlabel); 3485 3486 return (error); 3487 } 3488 3489 /* 3490 * MPSAFE 3491 */ 3492 int 3493 mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3494 { 3495 struct mac_policy_conf *mpc; 3496 char target[MAC_MAX_POLICY_NAME]; 3497 int error; 3498 3499 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL); 3500 if (error) 3501 return (error); 3502 3503 error = ENOSYS; 3504 MAC_POLICY_LIST_BUSY(); 3505 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3506 if (strcmp(mpc->mpc_name, target) == 0 && 3507 mpc->mpc_ops->mpo_syscall != NULL) { 3508 error = mpc->mpc_ops->mpo_syscall(td, 3509 SCARG(uap, call), SCARG(uap, arg)); 3510 goto out; 3511 } 3512 } 3513 3514 out: 3515 MAC_POLICY_LIST_UNBUSY(); 3516 return (error); 3517 } 3518 3519 SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); 3520 SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); 3521 3522 #else /* !MAC */ 3523 3524 int 3525 __mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3526 { 3527 3528 return (ENOSYS); 3529 } 3530 3531 int 3532 __mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3533 { 3534 3535 return (ENOSYS); 3536 } 3537 3538 int 3539 __mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3540 { 3541 3542 return (ENOSYS); 3543 } 3544 3545 int 3546 __mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3547 { 3548 3549 return (ENOSYS); 3550 } 3551 3552 int 3553 __mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3554 { 3555 3556 return (ENOSYS); 3557 } 3558 3559 int 3560 __mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3561 { 3562 3563 return (ENOSYS); 3564 } 3565 3566 int 3567 __mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3568 { 3569 3570 return (ENOSYS); 3571 } 3572 3573 int 3574 __mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3575 { 3576 3577 return (ENOSYS); 3578 } 3579 3580 int 3581 __mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3582 { 3583 3584 return (ENOSYS); 3585 } 3586 3587 int 3588 mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3589 { 3590 3591 return (ENOSYS); 3592 } 3593 3594 #endif 3595