1 /*- 2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson 3 * Copyright (c) 2001 Ilmar S. Habibulin 4 * Copyright (c) 2001, 2002, 2003 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 37 /* 38 * Framework for extensible kernel access control. Kernel and userland 39 * interface to the framework, policy registration and composition. 40 */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include "opt_mac.h" 46 #include "opt_devfs.h" 47 48 #include <sys/param.h> 49 #include <sys/condvar.h> 50 #include <sys/extattr.h> 51 #include <sys/imgact.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/mutex.h> 56 #include <sys/mac.h> 57 #include <sys/module.h> 58 #include <sys/proc.h> 59 #include <sys/sbuf.h> 60 #include <sys/systm.h> 61 #include <sys/sysproto.h> 62 #include <sys/sysent.h> 63 #include <sys/vnode.h> 64 #include <sys/mount.h> 65 #include <sys/file.h> 66 #include <sys/namei.h> 67 #include <sys/socket.h> 68 #include <sys/pipe.h> 69 #include <sys/socketvar.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/bpfdesc.h> 82 #include <net/if.h> 83 #include <net/if_var.h> 84 85 #include <netinet/in.h> 86 #include <netinet/ip_var.h> 87 88 #ifdef MAC 89 90 /* 91 * Declare that the kernel provides MAC support, version 1. This permits 92 * modules to refuse to be loaded if the necessary support isn't present, 93 * even if it's pre-boot. 94 */ 95 MODULE_VERSION(kernel_mac_support, 1); 96 97 SYSCTL_DECL(_security); 98 99 SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0, 100 "TrustedBSD MAC policy controls"); 101 102 #if MAC_MAX_SLOTS > 32 103 #error "MAC_MAX_SLOTS too large" 104 #endif 105 106 static unsigned int mac_max_slots = MAC_MAX_SLOTS; 107 static unsigned int mac_slot_offsets_free = (1 << MAC_MAX_SLOTS) - 1; 108 SYSCTL_UINT(_security_mac, OID_AUTO, max_slots, CTLFLAG_RD, 109 &mac_max_slots, 0, ""); 110 111 /* 112 * Has the kernel started generating labeled objects yet? All read/write 113 * access to this variable is serialized during the boot process. Following 114 * the end of serialization, we don't update this flag; no locking. 115 */ 116 static int mac_late = 0; 117 118 /* 119 * Warn about EA transactions only the first time they happen. 120 * Weak coherency, no locking. 121 */ 122 static int ea_warn_once = 0; 123 124 /* 125 * Flag to indicate whether or not we should allocate label storage for 126 * new mbufs. Since most dynamic policies we currently work with don't 127 * rely on mbuf labeling, try to avoid paying the cost of mtag allocation 128 * unless specifically notified of interest. One result of this is 129 * that if a dynamically loaded policy requests mbuf labels, it must 130 * be able to deal with a NULL label being returned on any mbufs that 131 * were already in flight when the policy was loaded. Since the policy 132 * already has to deal with uninitialized labels, this probably won't 133 * be a problem. Note: currently no locking. Will this be a problem? 134 */ 135 #ifndef MAC_ALWAYS_LABEL_MBUF 136 static int mac_labelmbufs = 0; 137 #endif 138 139 static int mac_enforce_fs = 1; 140 SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW, 141 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects"); 142 TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs); 143 144 static int mac_enforce_kld = 1; 145 SYSCTL_INT(_security_mac, OID_AUTO, enforce_kld, CTLFLAG_RW, 146 &mac_enforce_kld, 0, "Enforce MAC policy on kld operations"); 147 TUNABLE_INT("security.mac.enforce_kld", &mac_enforce_kld); 148 149 static int mac_enforce_network = 1; 150 SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW, 151 &mac_enforce_network, 0, "Enforce MAC policy on network packets"); 152 TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network); 153 154 static int mac_enforce_pipe = 1; 155 SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW, 156 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations"); 157 TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe); 158 159 static int mac_enforce_process = 1; 160 SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW, 161 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations"); 162 TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process); 163 164 static int mac_enforce_socket = 1; 165 SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW, 166 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations"); 167 TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket); 168 169 static int mac_enforce_system = 1; 170 SYSCTL_INT(_security_mac, OID_AUTO, enforce_system, CTLFLAG_RW, 171 &mac_enforce_system, 0, "Enforce MAC policy on system operations"); 172 TUNABLE_INT("security.mac.enforce_system", &mac_enforce_system); 173 174 static int mac_enforce_vm = 1; 175 SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW, 176 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations"); 177 TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm); 178 179 static int mac_mmap_revocation = 1; 180 SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW, 181 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject " 182 "relabel"); 183 static int mac_mmap_revocation_via_cow = 0; 184 SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW, 185 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via " 186 "copy-on-write semantics, or by removing all write access"); 187 188 #ifdef MAC_DEBUG 189 SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0, 190 "TrustedBSD MAC debug info"); 191 192 static int mac_debug_label_fallback = 0; 193 SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW, 194 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label" 195 "when label is corrupted."); 196 TUNABLE_INT("security.mac.debug_label_fallback", 197 &mac_debug_label_fallback); 198 199 SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0, 200 "TrustedBSD MAC object counters"); 201 202 static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs, 203 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents, 204 nmacipqs, nmacpipes, nmacprocs; 205 206 #define MAC_DEBUG_COUNTER_INC(x) atomic_add_int(x, 1); 207 #define MAC_DEBUG_COUNTER_DEC(x) atomic_subtract_int(x, 1); 208 209 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD, 210 &nmacmbufs, 0, "number of mbufs in use"); 211 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD, 212 &nmaccreds, 0, "number of ucreds in use"); 213 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD, 214 &nmacifnets, 0, "number of ifnets in use"); 215 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD, 216 &nmacipqs, 0, "number of ipqs in use"); 217 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD, 218 &nmacbpfdescs, 0, "number of bpfdescs in use"); 219 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD, 220 &nmacsockets, 0, "number of sockets in use"); 221 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD, 222 &nmacpipes, 0, "number of pipes in use"); 223 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, procs, CTLFLAG_RD, 224 &nmacprocs, 0, "number of procs in use"); 225 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD, 226 &nmacmounts, 0, "number of mounts in use"); 227 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD, 228 &nmactemp, 0, "number of temporary labels in use"); 229 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD, 230 &nmacvnodes, 0, "number of vnodes in use"); 231 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD, 232 &nmacdevfsdirents, 0, "number of devfs dirents inuse"); 233 #else 234 #define MAC_DEBUG_COUNTER_INC(x) 235 #define MAC_DEBUG_COUNTER_DEC(x) 236 #endif 237 238 static int error_select(int error1, int error2); 239 static int mac_policy_register(struct mac_policy_conf *mpc); 240 static int mac_policy_unregister(struct mac_policy_conf *mpc); 241 242 static void mac_check_vnode_mmap_downgrade(struct ucred *cred, 243 struct vnode *vp, int *prot); 244 static void mac_cred_mmapped_drop_perms_recurse(struct thread *td, 245 struct ucred *cred, struct vm_map *map); 246 247 static void mac_destroy_socket_label(struct label *label); 248 249 static int mac_setlabel_vnode_extattr(struct ucred *cred, 250 struct vnode *vp, struct label *intlabel); 251 252 MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes"); 253 MALLOC_DEFINE(M_MACTEMP, "mactemp", "MAC temporary label storage"); 254 255 /* 256 * mac_static_policy_list holds a list of policy modules that are not 257 * loaded while the system is "live", and cannot be unloaded. These 258 * policies can be invoked without holding the busy count. 259 * 260 * mac_policy_list stores the list of dynamic policies. A busy count is 261 * maintained for the list, stored in mac_policy_busy. The busy count 262 * is protected by mac_policy_mtx; the list may be modified only 263 * while the busy count is 0, requiring that the lock be held to 264 * prevent new references to the list from being acquired. For almost 265 * all operations, incrementing the busy count is sufficient to 266 * guarantee consistency, as the list cannot be modified while the 267 * busy count is elevated. For a few special operations involving a 268 * change to the list of active policies, the mtx itself must be held. 269 * A condition variable, mac_policy_cv, is used to signal potential 270 * exclusive consumers that they should try to acquire the lock if a 271 * first attempt at exclusive access fails. 272 */ 273 static struct mtx mac_policy_mtx; 274 static struct cv mac_policy_cv; 275 static int mac_policy_count; 276 static LIST_HEAD(, mac_policy_conf) mac_policy_list; 277 static LIST_HEAD(, mac_policy_conf) mac_static_policy_list; 278 279 /* 280 * We manually invoke WITNESS_WARN() to allow Witness to generate 281 * warnings even if we don't end up ever triggering the wait at 282 * run-time. The consumer of the exclusive interface must not hold 283 * any locks (other than potentially Giant) since we may sleep for 284 * long (potentially indefinite) periods of time waiting for the 285 * framework to become quiescent so that a policy list change may 286 * be made. 287 */ 288 static __inline void 289 mac_policy_grab_exclusive(void) 290 { 291 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 292 "mac_policy_grab_exclusive() at %s:%d", __FILE__, __LINE__); 293 mtx_lock(&mac_policy_mtx); 294 while (mac_policy_count != 0) 295 cv_wait(&mac_policy_cv, &mac_policy_mtx); 296 } 297 298 static __inline void 299 mac_policy_assert_exclusive(void) 300 { 301 mtx_assert(&mac_policy_mtx, MA_OWNED); 302 KASSERT(mac_policy_count == 0, 303 ("mac_policy_assert_exclusive(): not exclusive")); 304 } 305 306 static __inline void 307 mac_policy_release_exclusive(void) 308 { 309 310 KASSERT(mac_policy_count == 0, 311 ("mac_policy_release_exclusive(): not exclusive")); 312 mtx_unlock(&mac_policy_mtx); 313 cv_signal(&mac_policy_cv); 314 } 315 316 static __inline void 317 mac_policy_list_busy(void) 318 { 319 mtx_lock(&mac_policy_mtx); 320 mac_policy_count++; 321 mtx_unlock(&mac_policy_mtx); 322 } 323 324 static __inline int 325 mac_policy_list_conditional_busy(void) 326 { 327 int ret; 328 329 mtx_lock(&mac_policy_mtx); 330 if (!LIST_EMPTY(&mac_policy_list)) { 331 mac_policy_count++; 332 ret = 1; 333 } else 334 ret = 0; 335 mtx_unlock(&mac_policy_mtx); 336 return (ret); 337 } 338 339 static __inline void 340 mac_policy_list_unbusy(void) 341 { 342 mtx_lock(&mac_policy_mtx); 343 mac_policy_count--; 344 KASSERT(mac_policy_count >= 0, ("MAC_POLICY_LIST_LOCK")); 345 if (mac_policy_count == 0) 346 cv_signal(&mac_policy_cv); 347 mtx_unlock(&mac_policy_mtx); 348 } 349 350 /* 351 * MAC_CHECK performs the designated check by walking the policy 352 * module list and checking with each as to how it feels about the 353 * request. Note that it returns its value via 'error' in the scope 354 * of the caller. 355 */ 356 #define MAC_CHECK(check, args...) do { \ 357 struct mac_policy_conf *mpc; \ 358 int entrycount; \ 359 \ 360 error = 0; \ 361 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 362 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 363 error = error_select( \ 364 mpc->mpc_ops->mpo_ ## check (args), \ 365 error); \ 366 } \ 367 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 368 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 369 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 370 error = error_select( \ 371 mpc->mpc_ops->mpo_ ## check (args), \ 372 error); \ 373 } \ 374 mac_policy_list_unbusy(); \ 375 } \ 376 } while (0) 377 378 /* 379 * MAC_BOOLEAN performs the designated boolean composition by walking 380 * the module list, invoking each instance of the operation, and 381 * combining the results using the passed C operator. Note that it 382 * returns its value via 'result' in the scope of the caller, which 383 * should be initialized by the caller in a meaningful way to get 384 * a meaningful result. 385 */ 386 #define MAC_BOOLEAN(operation, composition, args...) do { \ 387 struct mac_policy_conf *mpc; \ 388 int entrycount; \ 389 \ 390 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 391 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 392 result = result composition \ 393 mpc->mpc_ops->mpo_ ## operation (args); \ 394 } \ 395 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 396 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 397 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 398 result = result composition \ 399 mpc->mpc_ops->mpo_ ## operation \ 400 (args); \ 401 } \ 402 mac_policy_list_unbusy(); \ 403 } \ 404 } while (0) 405 406 #define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \ 407 outbuflen) do { \ 408 int claimed, first, ignorenotfound, savedlen; \ 409 char *element_name, *element_temp; \ 410 struct sbuf sb; \ 411 \ 412 error = 0; \ 413 first = 1; \ 414 sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \ 415 element_temp = elementlist; \ 416 while ((element_name = strsep(&element_temp, ",")) != NULL) { \ 417 if (element_name[0] == '?') { \ 418 element_name++; \ 419 ignorenotfound = 1; \ 420 } else \ 421 ignorenotfound = 0; \ 422 savedlen = sbuf_len(&sb); \ 423 if (first) { \ 424 error = sbuf_printf(&sb, "%s/", element_name); \ 425 first = 0; \ 426 } else \ 427 error = sbuf_printf(&sb, ",%s/", element_name); \ 428 if (error == -1) { \ 429 error = EINVAL; /* XXX: E2BIG? */ \ 430 break; \ 431 } \ 432 claimed = 0; \ 433 MAC_CHECK(externalize_ ## type, label, element_name, \ 434 &sb, &claimed); \ 435 if (error) \ 436 break; \ 437 if (claimed == 0 && ignorenotfound) { \ 438 /* Revert last label name. */ \ 439 sbuf_setpos(&sb, savedlen); \ 440 } else if (claimed != 1) { \ 441 error = EINVAL; /* XXX: ENOLABEL? */ \ 442 break; \ 443 } \ 444 } \ 445 sbuf_finish(&sb); \ 446 } while (0) 447 448 #define MAC_INTERNALIZE(type, label, instring) do { \ 449 char *element, *element_name, *element_data; \ 450 int claimed; \ 451 \ 452 error = 0; \ 453 element = instring; \ 454 while ((element_name = strsep(&element, ",")) != NULL) { \ 455 element_data = element_name; \ 456 element_name = strsep(&element_data, "/"); \ 457 if (element_data == NULL) { \ 458 error = EINVAL; \ 459 break; \ 460 } \ 461 claimed = 0; \ 462 MAC_CHECK(internalize_ ## type, label, element_name, \ 463 element_data, &claimed); \ 464 if (error) \ 465 break; \ 466 if (claimed != 1) { \ 467 /* XXXMAC: Another error here? */ \ 468 error = EINVAL; \ 469 break; \ 470 } \ 471 } \ 472 } while (0) 473 474 /* 475 * MAC_PERFORM performs the designated operation by walking the policy 476 * module list and invoking that operation for each policy. 477 */ 478 #define MAC_PERFORM(operation, args...) do { \ 479 struct mac_policy_conf *mpc; \ 480 int entrycount; \ 481 \ 482 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 483 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 484 mpc->mpc_ops->mpo_ ## operation (args); \ 485 } \ 486 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 487 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 488 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 489 mpc->mpc_ops->mpo_ ## operation (args); \ 490 } \ 491 mac_policy_list_unbusy(); \ 492 } \ 493 } while (0) 494 495 /* 496 * Initialize the MAC subsystem, including appropriate SMP locks. 497 */ 498 static void 499 mac_init(void) 500 { 501 502 LIST_INIT(&mac_static_policy_list); 503 LIST_INIT(&mac_policy_list); 504 505 mtx_init(&mac_policy_mtx, "mac_policy_mtx", NULL, MTX_DEF); 506 cv_init(&mac_policy_cv, "mac_policy_cv"); 507 } 508 509 /* 510 * For the purposes of modules that want to know if they were loaded 511 * "early", set the mac_late flag once we've processed modules either 512 * linked into the kernel, or loaded before the kernel startup. 513 */ 514 static void 515 mac_late_init(void) 516 { 517 518 mac_late = 1; 519 } 520 521 /* 522 * After the policy list has changed, walk the list to update any global 523 * flags. Currently, we support only one flag, and it's conditionally 524 * defined; as a result, the entire function is conditional. Eventually, 525 * the #else case might also iterate across the policies. 526 */ 527 static void 528 mac_policy_updateflags(void) 529 { 530 #ifndef MAC_ALWAYS_LABEL_MBUF 531 struct mac_policy_conf *tmpc; 532 int labelmbufs; 533 534 mac_policy_assert_exclusive(); 535 536 labelmbufs = 0; 537 LIST_FOREACH(tmpc, &mac_static_policy_list, mpc_list) { 538 if (tmpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_LABELMBUFS) 539 labelmbufs++; 540 } 541 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { 542 if (tmpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_LABELMBUFS) 543 labelmbufs++; 544 } 545 mac_labelmbufs = (labelmbufs != 0); 546 #endif 547 } 548 549 /* 550 * Allow MAC policy modules to register during boot, etc. 551 */ 552 int 553 mac_policy_modevent(module_t mod, int type, void *data) 554 { 555 struct mac_policy_conf *mpc; 556 int error; 557 558 error = 0; 559 mpc = (struct mac_policy_conf *) data; 560 561 switch (type) { 562 case MOD_LOAD: 563 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE && 564 mac_late) { 565 printf("mac_policy_modevent: can't load %s policy " 566 "after booting\n", mpc->mpc_name); 567 error = EBUSY; 568 break; 569 } 570 error = mac_policy_register(mpc); 571 break; 572 case MOD_UNLOAD: 573 /* Don't unregister the module if it was never registered. */ 574 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) 575 != 0) 576 error = mac_policy_unregister(mpc); 577 else 578 error = 0; 579 break; 580 default: 581 break; 582 } 583 584 return (error); 585 } 586 587 static int 588 mac_policy_register(struct mac_policy_conf *mpc) 589 { 590 struct mac_policy_conf *tmpc; 591 int error, slot, static_entry; 592 593 error = 0; 594 595 /* 596 * We don't technically need exclusive access while !mac_late, 597 * but hold it for assertion consistency. 598 */ 599 mac_policy_grab_exclusive(); 600 601 /* 602 * If the module can potentially be unloaded, or we're loading 603 * late, we have to stick it in the non-static list and pay 604 * an extra performance overhead. Otherwise, we can pay a 605 * light locking cost and stick it in the static list. 606 */ 607 static_entry = (!mac_late && 608 !(mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK)); 609 610 if (static_entry) { 611 LIST_FOREACH(tmpc, &mac_static_policy_list, mpc_list) { 612 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { 613 error = EEXIST; 614 goto out; 615 } 616 } 617 } else { 618 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { 619 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { 620 error = EEXIST; 621 goto out; 622 } 623 } 624 } 625 if (mpc->mpc_field_off != NULL) { 626 slot = ffs(mac_slot_offsets_free); 627 if (slot == 0) { 628 error = ENOMEM; 629 goto out; 630 } 631 slot--; 632 mac_slot_offsets_free &= ~(1 << slot); 633 *mpc->mpc_field_off = slot; 634 } 635 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED; 636 637 /* 638 * If we're loading a MAC module after the framework has 639 * initialized, it has to go into the dynamic list. If 640 * we're loading it before we've finished initializing, 641 * it can go into the static list with weaker locker 642 * requirements. 643 */ 644 if (static_entry) 645 LIST_INSERT_HEAD(&mac_static_policy_list, mpc, mpc_list); 646 else 647 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list); 648 649 /* Per-policy initialization. */ 650 if (mpc->mpc_ops->mpo_init != NULL) 651 (*(mpc->mpc_ops->mpo_init))(mpc); 652 mac_policy_updateflags(); 653 654 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname, 655 mpc->mpc_name); 656 657 out: 658 mac_policy_release_exclusive(); 659 return (error); 660 } 661 662 static int 663 mac_policy_unregister(struct mac_policy_conf *mpc) 664 { 665 666 /* 667 * If we fail the load, we may get a request to unload. Check 668 * to see if we did the run-time registration, and if not, 669 * silently succeed. 670 */ 671 mac_policy_grab_exclusive(); 672 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) { 673 mac_policy_release_exclusive(); 674 return (0); 675 } 676 #if 0 677 /* 678 * Don't allow unloading modules with private data. 679 */ 680 if (mpc->mpc_field_off != NULL) { 681 MAC_POLICY_LIST_UNLOCK(); 682 return (EBUSY); 683 } 684 #endif 685 /* 686 * Only allow the unload to proceed if the module is unloadable 687 * by its own definition. 688 */ 689 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) { 690 mac_policy_release_exclusive(); 691 return (EBUSY); 692 } 693 if (mpc->mpc_ops->mpo_destroy != NULL) 694 (*(mpc->mpc_ops->mpo_destroy))(mpc); 695 696 LIST_REMOVE(mpc, mpc_list); 697 mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED; 698 mac_policy_updateflags(); 699 700 mac_policy_release_exclusive(); 701 702 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname, 703 mpc->mpc_name); 704 705 return (0); 706 } 707 708 /* 709 * Define an error value precedence, and given two arguments, selects the 710 * value with the higher precedence. 711 */ 712 static int 713 error_select(int error1, int error2) 714 { 715 716 /* Certain decision-making errors take top priority. */ 717 if (error1 == EDEADLK || error2 == EDEADLK) 718 return (EDEADLK); 719 720 /* Invalid arguments should be reported where possible. */ 721 if (error1 == EINVAL || error2 == EINVAL) 722 return (EINVAL); 723 724 /* Precedence goes to "visibility", with both process and file. */ 725 if (error1 == ESRCH || error2 == ESRCH) 726 return (ESRCH); 727 728 if (error1 == ENOENT || error2 == ENOENT) 729 return (ENOENT); 730 731 /* Precedence goes to DAC/MAC protections. */ 732 if (error1 == EACCES || error2 == EACCES) 733 return (EACCES); 734 735 /* Precedence goes to privilege. */ 736 if (error1 == EPERM || error2 == EPERM) 737 return (EPERM); 738 739 /* Precedence goes to error over success; otherwise, arbitrary. */ 740 if (error1 != 0) 741 return (error1); 742 return (error2); 743 } 744 745 static struct label * 746 mbuf_to_label(struct mbuf *mbuf) 747 { 748 struct m_tag *tag; 749 struct label *label; 750 751 tag = m_tag_find(mbuf, PACKET_TAG_MACLABEL, NULL); 752 label = (struct label *)(tag+1); 753 754 return (label); 755 } 756 757 static void 758 mac_init_label(struct label *label) 759 { 760 761 bzero(label, sizeof(*label)); 762 label->l_flags = MAC_FLAG_INITIALIZED; 763 } 764 765 static void 766 mac_destroy_label(struct label *label) 767 { 768 769 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED, 770 ("destroying uninitialized label")); 771 772 bzero(label, sizeof(*label)); 773 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */ 774 } 775 776 void 777 mac_init_bpfdesc(struct bpf_d *bpf_d) 778 { 779 780 mac_init_label(&bpf_d->bd_label); 781 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label); 782 MAC_DEBUG_COUNTER_INC(&nmacbpfdescs); 783 } 784 785 static void 786 mac_init_cred_label(struct label *label) 787 { 788 789 mac_init_label(label); 790 MAC_PERFORM(init_cred_label, label); 791 MAC_DEBUG_COUNTER_INC(&nmaccreds); 792 } 793 794 void 795 mac_init_cred(struct ucred *cred) 796 { 797 798 mac_init_cred_label(&cred->cr_label); 799 } 800 801 void 802 mac_init_devfsdirent(struct devfs_dirent *de) 803 { 804 805 mac_init_label(&de->de_label); 806 MAC_PERFORM(init_devfsdirent_label, &de->de_label); 807 MAC_DEBUG_COUNTER_INC(&nmacdevfsdirents); 808 } 809 810 static void 811 mac_init_ifnet_label(struct label *label) 812 { 813 814 mac_init_label(label); 815 MAC_PERFORM(init_ifnet_label, label); 816 MAC_DEBUG_COUNTER_INC(&nmacifnets); 817 } 818 819 void 820 mac_init_ifnet(struct ifnet *ifp) 821 { 822 823 mac_init_ifnet_label(&ifp->if_label); 824 } 825 826 int 827 mac_init_ipq(struct ipq *ipq, int flag) 828 { 829 int error; 830 831 mac_init_label(&ipq->ipq_label); 832 833 MAC_CHECK(init_ipq_label, &ipq->ipq_label, flag); 834 if (error) { 835 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label); 836 mac_destroy_label(&ipq->ipq_label); 837 } else { 838 MAC_DEBUG_COUNTER_INC(&nmacipqs); 839 } 840 return (error); 841 } 842 843 int 844 mac_init_mbuf_tag(struct m_tag *tag, int flag) 845 { 846 struct label *label; 847 int error; 848 849 label = (struct label *) (tag + 1); 850 mac_init_label(label); 851 852 MAC_CHECK(init_mbuf_label, label, flag); 853 if (error) { 854 MAC_PERFORM(destroy_mbuf_label, label); 855 mac_destroy_label(label); 856 } else { 857 MAC_DEBUG_COUNTER_INC(&nmacmbufs); 858 } 859 return (error); 860 } 861 862 int 863 mac_init_mbuf(struct mbuf *m, int flag) 864 { 865 struct m_tag *tag; 866 int error; 867 868 M_ASSERTPKTHDR(m); 869 870 #ifndef MAC_ALWAYS_LABEL_MBUF 871 /* 872 * If conditionally allocating mbuf labels, don't allocate unless 873 * they are required. 874 */ 875 if (!mac_labelmbufs) 876 return (0); 877 #endif 878 tag = m_tag_get(PACKET_TAG_MACLABEL, sizeof(struct label), 879 flag); 880 if (tag == NULL) 881 return (ENOMEM); 882 error = mac_init_mbuf_tag(tag, flag); 883 if (error) { 884 m_tag_free(tag); 885 return (error); 886 } 887 m_tag_prepend(m, tag); 888 return (0); 889 } 890 891 void 892 mac_init_mount(struct mount *mp) 893 { 894 895 mac_init_label(&mp->mnt_mntlabel); 896 mac_init_label(&mp->mnt_fslabel); 897 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel); 898 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel); 899 MAC_DEBUG_COUNTER_INC(&nmacmounts); 900 } 901 902 static void 903 mac_init_pipe_label(struct label *label) 904 { 905 906 mac_init_label(label); 907 MAC_PERFORM(init_pipe_label, label); 908 MAC_DEBUG_COUNTER_INC(&nmacpipes); 909 } 910 911 void 912 mac_init_pipe(struct pipe *pipe) 913 { 914 struct label *label; 915 916 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK); 917 pipe->pipe_label = label; 918 pipe->pipe_peer->pipe_label = label; 919 mac_init_pipe_label(label); 920 } 921 922 void 923 mac_init_proc(struct proc *p) 924 { 925 926 mac_init_label(&p->p_label); 927 MAC_PERFORM(init_proc_label, &p->p_label); 928 MAC_DEBUG_COUNTER_INC(&nmacprocs); 929 } 930 931 static int 932 mac_init_socket_label(struct label *label, int flag) 933 { 934 int error; 935 936 mac_init_label(label); 937 938 MAC_CHECK(init_socket_label, label, flag); 939 if (error) { 940 MAC_PERFORM(destroy_socket_label, label); 941 mac_destroy_label(label); 942 } else { 943 MAC_DEBUG_COUNTER_INC(&nmacsockets); 944 } 945 946 return (error); 947 } 948 949 static int 950 mac_init_socket_peer_label(struct label *label, int flag) 951 { 952 int error; 953 954 mac_init_label(label); 955 956 MAC_CHECK(init_socket_peer_label, label, flag); 957 if (error) { 958 MAC_PERFORM(destroy_socket_label, label); 959 mac_destroy_label(label); 960 } 961 962 return (error); 963 } 964 965 int 966 mac_init_socket(struct socket *socket, int flag) 967 { 968 int error; 969 970 error = mac_init_socket_label(&socket->so_label, flag); 971 if (error) 972 return (error); 973 974 error = mac_init_socket_peer_label(&socket->so_peerlabel, flag); 975 if (error) 976 mac_destroy_socket_label(&socket->so_label); 977 978 return (error); 979 } 980 981 void 982 mac_init_vnode_label(struct label *label) 983 { 984 985 mac_init_label(label); 986 MAC_PERFORM(init_vnode_label, label); 987 MAC_DEBUG_COUNTER_INC(&nmacvnodes); 988 } 989 990 void 991 mac_init_vnode(struct vnode *vp) 992 { 993 994 mac_init_vnode_label(&vp->v_label); 995 } 996 997 void 998 mac_destroy_bpfdesc(struct bpf_d *bpf_d) 999 { 1000 1001 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label); 1002 mac_destroy_label(&bpf_d->bd_label); 1003 MAC_DEBUG_COUNTER_DEC(&nmacbpfdescs); 1004 } 1005 1006 static void 1007 mac_destroy_cred_label(struct label *label) 1008 { 1009 1010 MAC_PERFORM(destroy_cred_label, label); 1011 mac_destroy_label(label); 1012 MAC_DEBUG_COUNTER_DEC(&nmaccreds); 1013 } 1014 1015 void 1016 mac_destroy_cred(struct ucred *cred) 1017 { 1018 1019 mac_destroy_cred_label(&cred->cr_label); 1020 } 1021 1022 void 1023 mac_destroy_devfsdirent(struct devfs_dirent *de) 1024 { 1025 1026 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label); 1027 mac_destroy_label(&de->de_label); 1028 MAC_DEBUG_COUNTER_DEC(&nmacdevfsdirents); 1029 } 1030 1031 static void 1032 mac_destroy_ifnet_label(struct label *label) 1033 { 1034 1035 MAC_PERFORM(destroy_ifnet_label, label); 1036 mac_destroy_label(label); 1037 MAC_DEBUG_COUNTER_DEC(&nmacifnets); 1038 } 1039 1040 void 1041 mac_destroy_ifnet(struct ifnet *ifp) 1042 { 1043 1044 mac_destroy_ifnet_label(&ifp->if_label); 1045 } 1046 1047 void 1048 mac_destroy_ipq(struct ipq *ipq) 1049 { 1050 1051 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label); 1052 mac_destroy_label(&ipq->ipq_label); 1053 MAC_DEBUG_COUNTER_DEC(&nmacipqs); 1054 } 1055 1056 void 1057 mac_destroy_mbuf_tag(struct m_tag *tag) 1058 { 1059 struct label *label; 1060 1061 label = (struct label *)(tag+1); 1062 1063 MAC_PERFORM(destroy_mbuf_label, label); 1064 mac_destroy_label(label); 1065 MAC_DEBUG_COUNTER_DEC(&nmacmbufs); 1066 } 1067 1068 void 1069 mac_destroy_mount(struct mount *mp) 1070 { 1071 1072 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel); 1073 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel); 1074 mac_destroy_label(&mp->mnt_fslabel); 1075 mac_destroy_label(&mp->mnt_mntlabel); 1076 MAC_DEBUG_COUNTER_DEC(&nmacmounts); 1077 } 1078 1079 static void 1080 mac_destroy_pipe_label(struct label *label) 1081 { 1082 1083 MAC_PERFORM(destroy_pipe_label, label); 1084 mac_destroy_label(label); 1085 MAC_DEBUG_COUNTER_DEC(&nmacpipes); 1086 } 1087 1088 void 1089 mac_destroy_pipe(struct pipe *pipe) 1090 { 1091 1092 mac_destroy_pipe_label(pipe->pipe_label); 1093 free(pipe->pipe_label, M_MACPIPELABEL); 1094 } 1095 1096 void 1097 mac_destroy_proc(struct proc *p) 1098 { 1099 1100 MAC_PERFORM(destroy_proc_label, &p->p_label); 1101 mac_destroy_label(&p->p_label); 1102 MAC_DEBUG_COUNTER_DEC(&nmacprocs); 1103 } 1104 1105 static void 1106 mac_destroy_socket_label(struct label *label) 1107 { 1108 1109 MAC_PERFORM(destroy_socket_label, label); 1110 mac_destroy_label(label); 1111 MAC_DEBUG_COUNTER_DEC(&nmacsockets); 1112 } 1113 1114 static void 1115 mac_destroy_socket_peer_label(struct label *label) 1116 { 1117 1118 MAC_PERFORM(destroy_socket_peer_label, label); 1119 mac_destroy_label(label); 1120 } 1121 1122 void 1123 mac_destroy_socket(struct socket *socket) 1124 { 1125 1126 mac_destroy_socket_label(&socket->so_label); 1127 mac_destroy_socket_peer_label(&socket->so_peerlabel); 1128 } 1129 1130 void 1131 mac_destroy_vnode_label(struct label *label) 1132 { 1133 1134 MAC_PERFORM(destroy_vnode_label, label); 1135 mac_destroy_label(label); 1136 MAC_DEBUG_COUNTER_DEC(&nmacvnodes); 1137 } 1138 1139 void 1140 mac_destroy_vnode(struct vnode *vp) 1141 { 1142 1143 mac_destroy_vnode_label(&vp->v_label); 1144 } 1145 1146 void 1147 mac_copy_mbuf_tag(struct m_tag *src, struct m_tag *dest) 1148 { 1149 struct label *src_label, *dest_label; 1150 1151 src_label = (struct label *)(src+1); 1152 dest_label = (struct label *)(dest+1); 1153 1154 /* 1155 * mac_init_mbuf_tag() is called on the target tag in 1156 * m_tag_copy(), so we don't need to call it here. 1157 */ 1158 MAC_PERFORM(copy_mbuf_label, src_label, dest_label); 1159 } 1160 1161 static void 1162 mac_copy_pipe_label(struct label *src, struct label *dest) 1163 { 1164 1165 MAC_PERFORM(copy_pipe_label, src, dest); 1166 } 1167 1168 void 1169 mac_copy_vnode_label(struct label *src, struct label *dest) 1170 { 1171 1172 MAC_PERFORM(copy_vnode_label, src, dest); 1173 } 1174 1175 static int 1176 mac_check_structmac_consistent(struct mac *mac) 1177 { 1178 1179 if (mac->m_buflen < 0 || 1180 mac->m_buflen > MAC_MAX_LABEL_BUF_LEN) 1181 return (EINVAL); 1182 1183 return (0); 1184 } 1185 1186 static int 1187 mac_externalize_cred_label(struct label *label, char *elements, 1188 char *outbuf, size_t outbuflen, int flags) 1189 { 1190 int error; 1191 1192 MAC_EXTERNALIZE(cred_label, label, elements, outbuf, outbuflen); 1193 1194 return (error); 1195 } 1196 1197 static int 1198 mac_externalize_ifnet_label(struct label *label, char *elements, 1199 char *outbuf, size_t outbuflen, int flags) 1200 { 1201 int error; 1202 1203 MAC_EXTERNALIZE(ifnet_label, label, elements, outbuf, outbuflen); 1204 1205 return (error); 1206 } 1207 1208 static int 1209 mac_externalize_pipe_label(struct label *label, char *elements, 1210 char *outbuf, size_t outbuflen, int flags) 1211 { 1212 int error; 1213 1214 MAC_EXTERNALIZE(pipe_label, label, elements, outbuf, outbuflen); 1215 1216 return (error); 1217 } 1218 1219 static int 1220 mac_externalize_socket_label(struct label *label, char *elements, 1221 char *outbuf, size_t outbuflen, int flags) 1222 { 1223 int error; 1224 1225 MAC_EXTERNALIZE(socket_label, label, elements, outbuf, outbuflen); 1226 1227 return (error); 1228 } 1229 1230 static int 1231 mac_externalize_socket_peer_label(struct label *label, char *elements, 1232 char *outbuf, size_t outbuflen, int flags) 1233 { 1234 int error; 1235 1236 MAC_EXTERNALIZE(socket_peer_label, label, elements, outbuf, outbuflen); 1237 1238 return (error); 1239 } 1240 1241 static int 1242 mac_externalize_vnode_label(struct label *label, char *elements, 1243 char *outbuf, size_t outbuflen, int flags) 1244 { 1245 int error; 1246 1247 MAC_EXTERNALIZE(vnode_label, label, elements, outbuf, outbuflen); 1248 1249 return (error); 1250 } 1251 1252 static int 1253 mac_internalize_cred_label(struct label *label, char *string) 1254 { 1255 int error; 1256 1257 MAC_INTERNALIZE(cred_label, label, string); 1258 1259 return (error); 1260 } 1261 1262 static int 1263 mac_internalize_ifnet_label(struct label *label, char *string) 1264 { 1265 int error; 1266 1267 MAC_INTERNALIZE(ifnet_label, label, string); 1268 1269 return (error); 1270 } 1271 1272 static int 1273 mac_internalize_pipe_label(struct label *label, char *string) 1274 { 1275 int error; 1276 1277 MAC_INTERNALIZE(pipe_label, label, string); 1278 1279 return (error); 1280 } 1281 1282 static int 1283 mac_internalize_socket_label(struct label *label, char *string) 1284 { 1285 int error; 1286 1287 MAC_INTERNALIZE(socket_label, label, string); 1288 1289 return (error); 1290 } 1291 1292 static int 1293 mac_internalize_vnode_label(struct label *label, char *string) 1294 { 1295 int error; 1296 1297 MAC_INTERNALIZE(vnode_label, label, string); 1298 1299 return (error); 1300 } 1301 1302 /* 1303 * Initialize MAC label for the first kernel process, from which other 1304 * kernel processes and threads are spawned. 1305 */ 1306 void 1307 mac_create_proc0(struct ucred *cred) 1308 { 1309 1310 MAC_PERFORM(create_proc0, cred); 1311 } 1312 1313 /* 1314 * Initialize MAC label for the first userland process, from which other 1315 * userland processes and threads are spawned. 1316 */ 1317 void 1318 mac_create_proc1(struct ucred *cred) 1319 { 1320 1321 MAC_PERFORM(create_proc1, cred); 1322 } 1323 1324 void 1325 mac_thread_userret(struct thread *td) 1326 { 1327 1328 MAC_PERFORM(thread_userret, td); 1329 } 1330 1331 /* 1332 * When a new process is created, its label must be initialized. Generally, 1333 * this involves inheritence from the parent process, modulo possible 1334 * deltas. This function allows that processing to take place. 1335 */ 1336 void 1337 mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred) 1338 { 1339 1340 MAC_PERFORM(create_cred, parent_cred, child_cred); 1341 } 1342 1343 void 1344 mac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de, 1345 struct vnode *vp) 1346 { 1347 1348 MAC_PERFORM(update_devfsdirent, mp, de, &de->de_label, vp, 1349 &vp->v_label); 1350 } 1351 1352 void 1353 mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de, 1354 struct vnode *vp) 1355 { 1356 1357 MAC_PERFORM(associate_vnode_devfs, mp, &mp->mnt_fslabel, de, 1358 &de->de_label, vp, &vp->v_label); 1359 } 1360 1361 int 1362 mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp) 1363 { 1364 int error; 1365 1366 ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr"); 1367 1368 MAC_CHECK(associate_vnode_extattr, mp, &mp->mnt_fslabel, vp, 1369 &vp->v_label); 1370 1371 return (error); 1372 } 1373 1374 void 1375 mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp) 1376 { 1377 1378 MAC_PERFORM(associate_vnode_singlelabel, mp, &mp->mnt_fslabel, vp, 1379 &vp->v_label); 1380 } 1381 1382 int 1383 mac_create_vnode_extattr(struct ucred *cred, struct mount *mp, 1384 struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 1385 { 1386 int error; 1387 1388 ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr"); 1389 ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr"); 1390 1391 error = VOP_OPENEXTATTR(vp, cred, curthread); 1392 if (error == EOPNOTSUPP) { 1393 /* XXX: Optionally abort if transactions not supported. */ 1394 if (ea_warn_once == 0) { 1395 printf("Warning: transactions not supported " 1396 "in EA write.\n"); 1397 ea_warn_once = 1; 1398 } 1399 } else if (error) 1400 return (error); 1401 1402 MAC_CHECK(create_vnode_extattr, cred, mp, &mp->mnt_fslabel, 1403 dvp, &dvp->v_label, vp, &vp->v_label, cnp); 1404 1405 if (error) { 1406 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 1407 return (error); 1408 } 1409 1410 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 1411 1412 if (error == EOPNOTSUPP) 1413 error = 0; /* XXX */ 1414 1415 return (error); 1416 } 1417 1418 static int 1419 mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 1420 struct label *intlabel) 1421 { 1422 int error; 1423 1424 ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr"); 1425 1426 error = VOP_OPENEXTATTR(vp, cred, curthread); 1427 if (error == EOPNOTSUPP) { 1428 /* XXX: Optionally abort if transactions not supported. */ 1429 if (ea_warn_once == 0) { 1430 printf("Warning: transactions not supported " 1431 "in EA write.\n"); 1432 ea_warn_once = 1; 1433 } 1434 } else if (error) 1435 return (error); 1436 1437 MAC_CHECK(setlabel_vnode_extattr, cred, vp, &vp->v_label, intlabel); 1438 1439 if (error) { 1440 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 1441 return (error); 1442 } 1443 1444 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 1445 1446 if (error == EOPNOTSUPP) 1447 error = 0; /* XXX */ 1448 1449 return (error); 1450 } 1451 1452 int 1453 mac_execve_enter(struct image_params *imgp, struct mac *mac_p, 1454 struct label *execlabelstorage) 1455 { 1456 struct mac mac; 1457 char *buffer; 1458 int error; 1459 1460 if (mac_p == NULL) 1461 return (0); 1462 1463 error = copyin(mac_p, &mac, sizeof(mac)); 1464 if (error) 1465 return (error); 1466 1467 error = mac_check_structmac_consistent(&mac); 1468 if (error) 1469 return (error); 1470 1471 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 1472 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 1473 if (error) { 1474 free(buffer, M_MACTEMP); 1475 return (error); 1476 } 1477 1478 mac_init_cred_label(execlabelstorage); 1479 error = mac_internalize_cred_label(execlabelstorage, buffer); 1480 free(buffer, M_MACTEMP); 1481 if (error) { 1482 mac_destroy_cred_label(execlabelstorage); 1483 return (error); 1484 } 1485 imgp->execlabel = execlabelstorage; 1486 return (0); 1487 } 1488 1489 void 1490 mac_execve_exit(struct image_params *imgp) 1491 { 1492 if (imgp->execlabel != NULL) 1493 mac_destroy_cred_label(imgp->execlabel); 1494 } 1495 1496 void 1497 mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, 1498 struct label *interpvnodelabel, struct image_params *imgp) 1499 { 1500 1501 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 1502 1503 if (!mac_enforce_process && !mac_enforce_fs) 1504 return; 1505 1506 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label, 1507 interpvnodelabel, imgp, imgp->execlabel); 1508 } 1509 1510 int 1511 mac_execve_will_transition(struct ucred *old, struct vnode *vp, 1512 struct label *interpvnodelabel, struct image_params *imgp) 1513 { 1514 int result; 1515 1516 ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition"); 1517 1518 if (!mac_enforce_process && !mac_enforce_fs) 1519 return (0); 1520 1521 result = 0; 1522 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label, 1523 interpvnodelabel, imgp, imgp->execlabel); 1524 1525 return (result); 1526 } 1527 1528 int 1529 mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode) 1530 { 1531 int error; 1532 1533 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 1534 1535 if (!mac_enforce_fs) 1536 return (0); 1537 1538 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, acc_mode); 1539 return (error); 1540 } 1541 1542 int 1543 mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 1544 { 1545 int error; 1546 1547 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 1548 1549 if (!mac_enforce_fs) 1550 return (0); 1551 1552 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label); 1553 return (error); 1554 } 1555 1556 int 1557 mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 1558 { 1559 int error; 1560 1561 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 1562 1563 if (!mac_enforce_fs) 1564 return (0); 1565 1566 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label); 1567 return (error); 1568 } 1569 1570 int 1571 mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1572 struct componentname *cnp, struct vattr *vap) 1573 { 1574 int error; 1575 1576 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 1577 1578 if (!mac_enforce_fs) 1579 return (0); 1580 1581 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap); 1582 return (error); 1583 } 1584 1585 int 1586 mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 1587 struct componentname *cnp) 1588 { 1589 int error; 1590 1591 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 1592 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 1593 1594 if (!mac_enforce_fs) 1595 return (0); 1596 1597 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp, 1598 &vp->v_label, cnp); 1599 return (error); 1600 } 1601 1602 int 1603 mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1604 acl_type_t type) 1605 { 1606 int error; 1607 1608 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 1609 1610 if (!mac_enforce_fs) 1611 return (0); 1612 1613 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type); 1614 return (error); 1615 } 1616 1617 int 1618 mac_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp, 1619 int attrnamespace, const char *name) 1620 { 1621 int error; 1622 1623 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr"); 1624 1625 if (!mac_enforce_fs) 1626 return (0); 1627 1628 MAC_CHECK(check_vnode_deleteextattr, cred, vp, &vp->v_label, 1629 attrnamespace, name); 1630 return (error); 1631 } 1632 1633 int 1634 mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 1635 struct image_params *imgp) 1636 { 1637 int error; 1638 1639 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 1640 1641 if (!mac_enforce_process && !mac_enforce_fs) 1642 return (0); 1643 1644 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label, imgp, 1645 imgp->execlabel); 1646 1647 return (error); 1648 } 1649 1650 int 1651 mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 1652 { 1653 int error; 1654 1655 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 1656 1657 if (!mac_enforce_fs) 1658 return (0); 1659 1660 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); 1661 return (error); 1662 } 1663 1664 int 1665 mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1666 int attrnamespace, const char *name, struct uio *uio) 1667 { 1668 int error; 1669 1670 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 1671 1672 if (!mac_enforce_fs) 1673 return (0); 1674 1675 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, 1676 attrnamespace, name, uio); 1677 return (error); 1678 } 1679 1680 int 1681 mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 1682 struct vnode *vp, struct componentname *cnp) 1683 { 1684 int error; 1685 1686 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 1687 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 1688 1689 if (!mac_enforce_fs) 1690 return (0); 1691 1692 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp, 1693 &vp->v_label, cnp); 1694 return (error); 1695 } 1696 1697 int 1698 mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp, 1699 int attrnamespace) 1700 { 1701 int error; 1702 1703 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr"); 1704 1705 if (!mac_enforce_fs) 1706 return (0); 1707 1708 MAC_CHECK(check_vnode_listextattr, cred, vp, &vp->v_label, 1709 attrnamespace); 1710 return (error); 1711 } 1712 1713 int 1714 mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 1715 struct componentname *cnp) 1716 { 1717 int error; 1718 1719 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 1720 1721 if (!mac_enforce_fs) 1722 return (0); 1723 1724 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); 1725 return (error); 1726 } 1727 1728 int 1729 mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot) 1730 { 1731 int error; 1732 1733 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 1734 1735 if (!mac_enforce_fs || !mac_enforce_vm) 1736 return (0); 1737 1738 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot); 1739 return (error); 1740 } 1741 1742 void 1743 mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 1744 { 1745 int result = *prot; 1746 1747 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 1748 1749 if (!mac_enforce_fs || !mac_enforce_vm) 1750 return; 1751 1752 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label, 1753 &result); 1754 1755 *prot = result; 1756 } 1757 1758 int 1759 mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 1760 { 1761 int error; 1762 1763 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 1764 1765 if (!mac_enforce_fs || !mac_enforce_vm) 1766 return (0); 1767 1768 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot); 1769 return (error); 1770 } 1771 1772 int 1773 mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 1774 { 1775 int error; 1776 1777 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 1778 1779 if (!mac_enforce_fs) 1780 return (0); 1781 1782 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); 1783 return (error); 1784 } 1785 1786 int 1787 mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 1788 struct vnode *vp) 1789 { 1790 int error; 1791 1792 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 1793 1794 if (!mac_enforce_fs) 1795 return (0); 1796 1797 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 1798 &vp->v_label); 1799 1800 return (error); 1801 } 1802 1803 int 1804 mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 1805 struct vnode *vp) 1806 { 1807 int error; 1808 1809 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 1810 1811 if (!mac_enforce_fs) 1812 return (0); 1813 1814 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 1815 &vp->v_label); 1816 1817 return (error); 1818 } 1819 1820 int 1821 mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 1822 { 1823 int error; 1824 1825 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 1826 1827 if (!mac_enforce_fs) 1828 return (0); 1829 1830 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); 1831 return (error); 1832 } 1833 1834 int 1835 mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 1836 { 1837 int error; 1838 1839 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 1840 1841 if (!mac_enforce_fs) 1842 return (0); 1843 1844 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); 1845 return (error); 1846 } 1847 1848 static int 1849 mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 1850 struct label *newlabel) 1851 { 1852 int error; 1853 1854 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 1855 1856 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); 1857 1858 return (error); 1859 } 1860 1861 int 1862 mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 1863 struct vnode *vp, struct componentname *cnp) 1864 { 1865 int error; 1866 1867 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 1868 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 1869 1870 if (!mac_enforce_fs) 1871 return (0); 1872 1873 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, 1874 &vp->v_label, cnp); 1875 return (error); 1876 } 1877 1878 int 1879 mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 1880 struct vnode *vp, int samedir, struct componentname *cnp) 1881 { 1882 int error; 1883 1884 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 1885 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 1886 1887 if (!mac_enforce_fs) 1888 return (0); 1889 1890 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, 1891 vp != NULL ? &vp->v_label : NULL, samedir, cnp); 1892 return (error); 1893 } 1894 1895 int 1896 mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 1897 { 1898 int error; 1899 1900 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 1901 1902 if (!mac_enforce_fs) 1903 return (0); 1904 1905 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); 1906 return (error); 1907 } 1908 1909 int 1910 mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 1911 struct acl *acl) 1912 { 1913 int error; 1914 1915 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 1916 1917 if (!mac_enforce_fs) 1918 return (0); 1919 1920 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); 1921 return (error); 1922 } 1923 1924 int 1925 mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 1926 int attrnamespace, const char *name, struct uio *uio) 1927 { 1928 int error; 1929 1930 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 1931 1932 if (!mac_enforce_fs) 1933 return (0); 1934 1935 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, 1936 attrnamespace, name, uio); 1937 return (error); 1938 } 1939 1940 int 1941 mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 1942 { 1943 int error; 1944 1945 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 1946 1947 if (!mac_enforce_fs) 1948 return (0); 1949 1950 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); 1951 return (error); 1952 } 1953 1954 int 1955 mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 1956 { 1957 int error; 1958 1959 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 1960 1961 if (!mac_enforce_fs) 1962 return (0); 1963 1964 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); 1965 return (error); 1966 } 1967 1968 int 1969 mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 1970 gid_t gid) 1971 { 1972 int error; 1973 1974 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 1975 1976 if (!mac_enforce_fs) 1977 return (0); 1978 1979 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); 1980 return (error); 1981 } 1982 1983 int 1984 mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 1985 struct timespec atime, struct timespec mtime) 1986 { 1987 int error; 1988 1989 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 1990 1991 if (!mac_enforce_fs) 1992 return (0); 1993 1994 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, 1995 mtime); 1996 return (error); 1997 } 1998 1999 int 2000 mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2001 struct vnode *vp) 2002 { 2003 int error; 2004 2005 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 2006 2007 if (!mac_enforce_fs) 2008 return (0); 2009 2010 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 2011 &vp->v_label); 2012 return (error); 2013 } 2014 2015 int 2016 mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 2017 struct vnode *vp) 2018 { 2019 int error; 2020 2021 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 2022 2023 if (!mac_enforce_fs) 2024 return (0); 2025 2026 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 2027 &vp->v_label); 2028 2029 return (error); 2030 } 2031 2032 /* 2033 * When relabeling a process, call out to the policies for the maximum 2034 * permission allowed for each object type we know about in its 2035 * memory space, and revoke access (in the least surprising ways we 2036 * know) when necessary. The process lock is not held here. 2037 */ 2038 void 2039 mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) 2040 { 2041 2042 /* XXX freeze all other threads */ 2043 mac_cred_mmapped_drop_perms_recurse(td, cred, 2044 &td->td_proc->p_vmspace->vm_map); 2045 /* XXX allow other threads to continue */ 2046 } 2047 2048 static __inline const char * 2049 prot2str(vm_prot_t prot) 2050 { 2051 2052 switch (prot & VM_PROT_ALL) { 2053 case VM_PROT_READ: 2054 return ("r--"); 2055 case VM_PROT_READ | VM_PROT_WRITE: 2056 return ("rw-"); 2057 case VM_PROT_READ | VM_PROT_EXECUTE: 2058 return ("r-x"); 2059 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 2060 return ("rwx"); 2061 case VM_PROT_WRITE: 2062 return ("-w-"); 2063 case VM_PROT_EXECUTE: 2064 return ("--x"); 2065 case VM_PROT_WRITE | VM_PROT_EXECUTE: 2066 return ("-wx"); 2067 default: 2068 return ("---"); 2069 } 2070 } 2071 2072 static void 2073 mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, 2074 struct vm_map *map) 2075 { 2076 struct vm_map_entry *vme; 2077 int result; 2078 vm_prot_t revokeperms; 2079 vm_object_t object; 2080 vm_ooffset_t offset; 2081 struct vnode *vp; 2082 2083 if (!mac_mmap_revocation) 2084 return; 2085 2086 vm_map_lock_read(map); 2087 for (vme = map->header.next; vme != &map->header; vme = vme->next) { 2088 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { 2089 mac_cred_mmapped_drop_perms_recurse(td, cred, 2090 vme->object.sub_map); 2091 continue; 2092 } 2093 /* 2094 * Skip over entries that obviously are not shared. 2095 */ 2096 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || 2097 !vme->max_protection) 2098 continue; 2099 /* 2100 * Drill down to the deepest backing object. 2101 */ 2102 offset = vme->offset; 2103 object = vme->object.vm_object; 2104 if (object == NULL) 2105 continue; 2106 while (object->backing_object != NULL) { 2107 object = object->backing_object; 2108 offset += object->backing_object_offset; 2109 } 2110 /* 2111 * At the moment, vm_maps and objects aren't considered 2112 * by the MAC system, so only things with backing by a 2113 * normal object (read: vnodes) are checked. 2114 */ 2115 if (object->type != OBJT_VNODE) 2116 continue; 2117 vp = (struct vnode *)object->handle; 2118 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2119 result = vme->max_protection; 2120 mac_check_vnode_mmap_downgrade(cred, vp, &result); 2121 VOP_UNLOCK(vp, 0, td); 2122 /* 2123 * Find out what maximum protection we may be allowing 2124 * now but a policy needs to get removed. 2125 */ 2126 revokeperms = vme->max_protection & ~result; 2127 if (!revokeperms) 2128 continue; 2129 printf("pid %ld: revoking %s perms from %#lx:%ld " 2130 "(max %s/cur %s)\n", (long)td->td_proc->p_pid, 2131 prot2str(revokeperms), (u_long)vme->start, 2132 (long)(vme->end - vme->start), 2133 prot2str(vme->max_protection), prot2str(vme->protection)); 2134 vm_map_lock_upgrade(map); 2135 /* 2136 * This is the really simple case: if a map has more 2137 * max_protection than is allowed, but it's not being 2138 * actually used (that is, the current protection is 2139 * still allowed), we can just wipe it out and do 2140 * nothing more. 2141 */ 2142 if ((vme->protection & revokeperms) == 0) { 2143 vme->max_protection -= revokeperms; 2144 } else { 2145 if (revokeperms & VM_PROT_WRITE) { 2146 /* 2147 * In the more complicated case, flush out all 2148 * pending changes to the object then turn it 2149 * copy-on-write. 2150 */ 2151 vm_object_reference(object); 2152 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2153 VM_OBJECT_LOCK(object); 2154 vm_object_page_clean(object, 2155 OFF_TO_IDX(offset), 2156 OFF_TO_IDX(offset + vme->end - vme->start + 2157 PAGE_MASK), 2158 OBJPC_SYNC); 2159 VM_OBJECT_UNLOCK(object); 2160 VOP_UNLOCK(vp, 0, td); 2161 vm_object_deallocate(object); 2162 /* 2163 * Why bother if there's no read permissions 2164 * anymore? For the rest, we need to leave 2165 * the write permissions on for COW, or 2166 * remove them entirely if configured to. 2167 */ 2168 if (!mac_mmap_revocation_via_cow) { 2169 vme->max_protection &= ~VM_PROT_WRITE; 2170 vme->protection &= ~VM_PROT_WRITE; 2171 } if ((revokeperms & VM_PROT_READ) == 0) 2172 vme->eflags |= MAP_ENTRY_COW | 2173 MAP_ENTRY_NEEDS_COPY; 2174 } 2175 if (revokeperms & VM_PROT_EXECUTE) { 2176 vme->max_protection &= ~VM_PROT_EXECUTE; 2177 vme->protection &= ~VM_PROT_EXECUTE; 2178 } 2179 if (revokeperms & VM_PROT_READ) { 2180 vme->max_protection = 0; 2181 vme->protection = 0; 2182 } 2183 pmap_protect(map->pmap, vme->start, vme->end, 2184 vme->protection & ~revokeperms); 2185 vm_map_simplify_entry(map, vme); 2186 } 2187 vm_map_lock_downgrade(map); 2188 } 2189 vm_map_unlock_read(map); 2190 } 2191 2192 /* 2193 * When the subject's label changes, it may require revocation of privilege 2194 * to mapped objects. This can't be done on-the-fly later with a unified 2195 * buffer cache. 2196 */ 2197 static void 2198 mac_relabel_cred(struct ucred *cred, struct label *newlabel) 2199 { 2200 2201 MAC_PERFORM(relabel_cred, cred, newlabel); 2202 } 2203 2204 void 2205 mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 2206 { 2207 2208 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); 2209 } 2210 2211 void 2212 mac_create_ifnet(struct ifnet *ifnet) 2213 { 2214 2215 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label); 2216 } 2217 2218 void 2219 mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d) 2220 { 2221 2222 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label); 2223 } 2224 2225 void 2226 mac_create_socket(struct ucred *cred, struct socket *socket) 2227 { 2228 2229 MAC_PERFORM(create_socket, cred, socket, &socket->so_label); 2230 } 2231 2232 void 2233 mac_create_pipe(struct ucred *cred, struct pipe *pipe) 2234 { 2235 2236 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); 2237 } 2238 2239 void 2240 mac_create_socket_from_socket(struct socket *oldsocket, 2241 struct socket *newsocket) 2242 { 2243 2244 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label, 2245 newsocket, &newsocket->so_label); 2246 } 2247 2248 static void 2249 mac_relabel_socket(struct ucred *cred, struct socket *socket, 2250 struct label *newlabel) 2251 { 2252 2253 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); 2254 } 2255 2256 static void 2257 mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) 2258 { 2259 2260 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); 2261 } 2262 2263 void 2264 mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) 2265 { 2266 struct label *label; 2267 2268 label = mbuf_to_label(mbuf); 2269 2270 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, label, socket, 2271 &socket->so_peerlabel); 2272 } 2273 2274 void 2275 mac_set_socket_peer_from_socket(struct socket *oldsocket, 2276 struct socket *newsocket) 2277 { 2278 2279 MAC_PERFORM(set_socket_peer_from_socket, oldsocket, 2280 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel); 2281 } 2282 2283 void 2284 mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram) 2285 { 2286 struct label *label; 2287 2288 label = mbuf_to_label(datagram); 2289 2290 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label, 2291 datagram, label); 2292 } 2293 2294 void 2295 mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment) 2296 { 2297 struct label *datagramlabel, *fragmentlabel; 2298 2299 datagramlabel = mbuf_to_label(datagram); 2300 fragmentlabel = mbuf_to_label(fragment); 2301 2302 MAC_PERFORM(create_fragment, datagram, datagramlabel, fragment, 2303 fragmentlabel); 2304 } 2305 2306 void 2307 mac_create_ipq(struct mbuf *fragment, struct ipq *ipq) 2308 { 2309 struct label *label; 2310 2311 label = mbuf_to_label(fragment); 2312 2313 MAC_PERFORM(create_ipq, fragment, label, ipq, &ipq->ipq_label); 2314 } 2315 2316 void 2317 mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2318 { 2319 struct label *oldmbuflabel, *newmbuflabel; 2320 2321 oldmbuflabel = mbuf_to_label(oldmbuf); 2322 newmbuflabel = mbuf_to_label(newmbuf); 2323 2324 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, oldmbuflabel, newmbuf, 2325 newmbuflabel); 2326 } 2327 2328 void 2329 mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf) 2330 { 2331 struct label *label; 2332 2333 label = mbuf_to_label(mbuf); 2334 2335 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf, 2336 label); 2337 } 2338 2339 void 2340 mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf) 2341 { 2342 struct label *label; 2343 2344 label = mbuf_to_label(mbuf); 2345 2346 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf, 2347 label); 2348 } 2349 2350 void 2351 mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf) 2352 { 2353 struct label *label; 2354 2355 label = mbuf_to_label(mbuf); 2356 2357 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf, 2358 label); 2359 } 2360 2361 void 2362 mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet, 2363 struct mbuf *newmbuf) 2364 { 2365 struct label *oldmbuflabel, *newmbuflabel; 2366 2367 oldmbuflabel = mbuf_to_label(oldmbuf); 2368 newmbuflabel = mbuf_to_label(newmbuf); 2369 2370 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, oldmbuflabel, 2371 ifnet, &ifnet->if_label, newmbuf, newmbuflabel); 2372 } 2373 2374 void 2375 mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2376 { 2377 struct label *oldmbuflabel, *newmbuflabel; 2378 2379 oldmbuflabel = mbuf_to_label(oldmbuf); 2380 newmbuflabel = mbuf_to_label(newmbuf); 2381 2382 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, oldmbuflabel, newmbuf, 2383 newmbuflabel); 2384 } 2385 2386 int 2387 mac_fragment_match(struct mbuf *fragment, struct ipq *ipq) 2388 { 2389 struct label *label; 2390 int result; 2391 2392 label = mbuf_to_label(fragment); 2393 2394 result = 1; 2395 MAC_BOOLEAN(fragment_match, &&, fragment, label, ipq, 2396 &ipq->ipq_label); 2397 2398 return (result); 2399 } 2400 2401 void 2402 mac_reflect_mbuf_icmp(struct mbuf *m) 2403 { 2404 struct label *label; 2405 2406 label = mbuf_to_label(m); 2407 2408 MAC_PERFORM(reflect_mbuf_icmp, m, label); 2409 } 2410 void 2411 mac_reflect_mbuf_tcp(struct mbuf *m) 2412 { 2413 struct label *label; 2414 2415 label = mbuf_to_label(m); 2416 2417 MAC_PERFORM(reflect_mbuf_tcp, m, label); 2418 } 2419 2420 void 2421 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq) 2422 { 2423 struct label *label; 2424 2425 label = mbuf_to_label(fragment); 2426 2427 MAC_PERFORM(update_ipq, fragment, label, ipq, &ipq->ipq_label); 2428 } 2429 2430 void 2431 mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) 2432 { 2433 struct label *label; 2434 2435 label = mbuf_to_label(mbuf); 2436 2437 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf, 2438 label); 2439 } 2440 2441 void 2442 mac_create_mount(struct ucred *cred, struct mount *mp) 2443 { 2444 2445 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, 2446 &mp->mnt_fslabel); 2447 } 2448 2449 void 2450 mac_create_root_mount(struct ucred *cred, struct mount *mp) 2451 { 2452 2453 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, 2454 &mp->mnt_fslabel); 2455 } 2456 2457 int 2458 mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) 2459 { 2460 int error; 2461 2462 if (!mac_enforce_network) 2463 return (0); 2464 2465 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet, 2466 &ifnet->if_label); 2467 2468 return (error); 2469 } 2470 2471 static int 2472 mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) 2473 { 2474 int error; 2475 2476 MAC_CHECK(check_cred_relabel, cred, newlabel); 2477 2478 return (error); 2479 } 2480 2481 int 2482 mac_check_cred_visible(struct ucred *u1, struct ucred *u2) 2483 { 2484 int error; 2485 2486 if (!mac_enforce_process) 2487 return (0); 2488 2489 MAC_CHECK(check_cred_visible, u1, u2); 2490 2491 return (error); 2492 } 2493 2494 int 2495 mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) 2496 { 2497 struct label *label; 2498 int error; 2499 2500 M_ASSERTPKTHDR(mbuf); 2501 2502 if (!mac_enforce_network) 2503 return (0); 2504 2505 label = mbuf_to_label(mbuf); 2506 2507 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf, 2508 label); 2509 2510 return (error); 2511 } 2512 2513 int 2514 mac_check_kenv_dump(struct ucred *cred) 2515 { 2516 int error; 2517 2518 if (!mac_enforce_system) 2519 return (0); 2520 2521 MAC_CHECK(check_kenv_dump, cred); 2522 2523 return (error); 2524 } 2525 2526 int 2527 mac_check_kenv_get(struct ucred *cred, char *name) 2528 { 2529 int error; 2530 2531 if (!mac_enforce_system) 2532 return (0); 2533 2534 MAC_CHECK(check_kenv_get, cred, name); 2535 2536 return (error); 2537 } 2538 2539 int 2540 mac_check_kenv_set(struct ucred *cred, char *name, char *value) 2541 { 2542 int error; 2543 2544 if (!mac_enforce_system) 2545 return (0); 2546 2547 MAC_CHECK(check_kenv_set, cred, name, value); 2548 2549 return (error); 2550 } 2551 2552 int 2553 mac_check_kenv_unset(struct ucred *cred, char *name) 2554 { 2555 int error; 2556 2557 if (!mac_enforce_system) 2558 return (0); 2559 2560 MAC_CHECK(check_kenv_unset, cred, name); 2561 2562 return (error); 2563 } 2564 2565 int 2566 mac_check_kld_load(struct ucred *cred, struct vnode *vp) 2567 { 2568 int error; 2569 2570 ASSERT_VOP_LOCKED(vp, "mac_check_kld_load"); 2571 2572 if (!mac_enforce_kld) 2573 return (0); 2574 2575 MAC_CHECK(check_kld_load, cred, vp, &vp->v_label); 2576 2577 return (error); 2578 } 2579 2580 int 2581 mac_check_kld_stat(struct ucred *cred) 2582 { 2583 int error; 2584 2585 if (!mac_enforce_kld) 2586 return (0); 2587 2588 MAC_CHECK(check_kld_stat, cred); 2589 2590 return (error); 2591 } 2592 2593 int 2594 mac_check_kld_unload(struct ucred *cred) 2595 { 2596 int error; 2597 2598 if (!mac_enforce_kld) 2599 return (0); 2600 2601 MAC_CHECK(check_kld_unload, cred); 2602 2603 return (error); 2604 } 2605 2606 int 2607 mac_check_mount_stat(struct ucred *cred, struct mount *mount) 2608 { 2609 int error; 2610 2611 if (!mac_enforce_fs) 2612 return (0); 2613 2614 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); 2615 2616 return (error); 2617 } 2618 2619 int 2620 mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, 2621 void *data) 2622 { 2623 int error; 2624 2625 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2626 2627 if (!mac_enforce_pipe) 2628 return (0); 2629 2630 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); 2631 2632 return (error); 2633 } 2634 2635 int 2636 mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) 2637 { 2638 int error; 2639 2640 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2641 2642 if (!mac_enforce_pipe) 2643 return (0); 2644 2645 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); 2646 2647 return (error); 2648 } 2649 2650 int 2651 mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) 2652 { 2653 int error; 2654 2655 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2656 2657 if (!mac_enforce_pipe) 2658 return (0); 2659 2660 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); 2661 2662 return (error); 2663 } 2664 2665 static int 2666 mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 2667 struct label *newlabel) 2668 { 2669 int error; 2670 2671 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2672 2673 if (!mac_enforce_pipe) 2674 return (0); 2675 2676 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); 2677 2678 return (error); 2679 } 2680 2681 int 2682 mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) 2683 { 2684 int error; 2685 2686 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2687 2688 if (!mac_enforce_pipe) 2689 return (0); 2690 2691 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); 2692 2693 return (error); 2694 } 2695 2696 int 2697 mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) 2698 { 2699 int error; 2700 2701 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2702 2703 if (!mac_enforce_pipe) 2704 return (0); 2705 2706 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); 2707 2708 return (error); 2709 } 2710 2711 int 2712 mac_check_proc_debug(struct ucred *cred, struct proc *proc) 2713 { 2714 int error; 2715 2716 PROC_LOCK_ASSERT(proc, MA_OWNED); 2717 2718 if (!mac_enforce_process) 2719 return (0); 2720 2721 MAC_CHECK(check_proc_debug, cred, proc); 2722 2723 return (error); 2724 } 2725 2726 int 2727 mac_check_proc_sched(struct ucred *cred, struct proc *proc) 2728 { 2729 int error; 2730 2731 PROC_LOCK_ASSERT(proc, MA_OWNED); 2732 2733 if (!mac_enforce_process) 2734 return (0); 2735 2736 MAC_CHECK(check_proc_sched, cred, proc); 2737 2738 return (error); 2739 } 2740 2741 int 2742 mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 2743 { 2744 int error; 2745 2746 PROC_LOCK_ASSERT(proc, MA_OWNED); 2747 2748 if (!mac_enforce_process) 2749 return (0); 2750 2751 MAC_CHECK(check_proc_signal, cred, proc, signum); 2752 2753 return (error); 2754 } 2755 2756 int 2757 mac_check_socket_bind(struct ucred *ucred, struct socket *socket, 2758 struct sockaddr *sockaddr) 2759 { 2760 int error; 2761 2762 if (!mac_enforce_socket) 2763 return (0); 2764 2765 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label, 2766 sockaddr); 2767 2768 return (error); 2769 } 2770 2771 int 2772 mac_check_socket_connect(struct ucred *cred, struct socket *socket, 2773 struct sockaddr *sockaddr) 2774 { 2775 int error; 2776 2777 if (!mac_enforce_socket) 2778 return (0); 2779 2780 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label, 2781 sockaddr); 2782 2783 return (error); 2784 } 2785 2786 int 2787 mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf) 2788 { 2789 struct label *label; 2790 int error; 2791 2792 if (!mac_enforce_socket) 2793 return (0); 2794 2795 label = mbuf_to_label(mbuf); 2796 2797 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf, 2798 label); 2799 2800 return (error); 2801 } 2802 2803 int 2804 mac_check_socket_listen(struct ucred *cred, struct socket *socket) 2805 { 2806 int error; 2807 2808 if (!mac_enforce_socket) 2809 return (0); 2810 2811 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label); 2812 return (error); 2813 } 2814 2815 int 2816 mac_check_socket_receive(struct ucred *cred, struct socket *so) 2817 { 2818 int error; 2819 2820 if (!mac_enforce_socket) 2821 return (0); 2822 2823 MAC_CHECK(check_socket_receive, cred, so, &so->so_label); 2824 2825 return (error); 2826 } 2827 2828 static int 2829 mac_check_socket_relabel(struct ucred *cred, struct socket *socket, 2830 struct label *newlabel) 2831 { 2832 int error; 2833 2834 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label, 2835 newlabel); 2836 2837 return (error); 2838 } 2839 2840 int 2841 mac_check_socket_send(struct ucred *cred, struct socket *so) 2842 { 2843 int error; 2844 2845 if (!mac_enforce_socket) 2846 return (0); 2847 2848 MAC_CHECK(check_socket_send, cred, so, &so->so_label); 2849 2850 return (error); 2851 } 2852 2853 int 2854 mac_check_socket_visible(struct ucred *cred, struct socket *socket) 2855 { 2856 int error; 2857 2858 if (!mac_enforce_socket) 2859 return (0); 2860 2861 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label); 2862 2863 return (error); 2864 } 2865 2866 int 2867 mac_check_sysarch_ioperm(struct ucred *cred) 2868 { 2869 int error; 2870 2871 if (!mac_enforce_system) 2872 return (0); 2873 2874 MAC_CHECK(check_sysarch_ioperm, cred); 2875 return (error); 2876 } 2877 2878 int 2879 mac_check_system_acct(struct ucred *cred, struct vnode *vp) 2880 { 2881 int error; 2882 2883 if (vp != NULL) { 2884 ASSERT_VOP_LOCKED(vp, "mac_check_system_acct"); 2885 } 2886 2887 if (!mac_enforce_system) 2888 return (0); 2889 2890 MAC_CHECK(check_system_acct, cred, vp, 2891 vp != NULL ? &vp->v_label : NULL); 2892 2893 return (error); 2894 } 2895 2896 int 2897 mac_check_system_nfsd(struct ucred *cred) 2898 { 2899 int error; 2900 2901 if (!mac_enforce_system) 2902 return (0); 2903 2904 MAC_CHECK(check_system_nfsd, cred); 2905 2906 return (error); 2907 } 2908 2909 int 2910 mac_check_system_reboot(struct ucred *cred, int howto) 2911 { 2912 int error; 2913 2914 if (!mac_enforce_system) 2915 return (0); 2916 2917 MAC_CHECK(check_system_reboot, cred, howto); 2918 2919 return (error); 2920 } 2921 2922 int 2923 mac_check_system_settime(struct ucred *cred) 2924 { 2925 int error; 2926 2927 if (!mac_enforce_system) 2928 return (0); 2929 2930 MAC_CHECK(check_system_settime, cred); 2931 2932 return (error); 2933 } 2934 2935 int 2936 mac_check_system_swapon(struct ucred *cred, struct vnode *vp) 2937 { 2938 int error; 2939 2940 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon"); 2941 2942 if (!mac_enforce_system) 2943 return (0); 2944 2945 MAC_CHECK(check_system_swapon, cred, vp, &vp->v_label); 2946 return (error); 2947 } 2948 2949 int 2950 mac_check_system_swapoff(struct ucred *cred, struct vnode *vp) 2951 { 2952 int error; 2953 2954 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapoff"); 2955 2956 if (!mac_enforce_system) 2957 return (0); 2958 2959 MAC_CHECK(check_system_swapoff, cred, vp, &vp->v_label); 2960 return (error); 2961 } 2962 2963 int 2964 mac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen, 2965 void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen) 2966 { 2967 int error; 2968 2969 /* 2970 * XXXMAC: We're very much like to assert the SYSCTL_LOCK here, 2971 * but since it's not exported from kern_sysctl.c, we can't. 2972 */ 2973 if (!mac_enforce_system) 2974 return (0); 2975 2976 MAC_CHECK(check_system_sysctl, cred, name, namelen, old, oldlenp, 2977 inkernel, new, newlen); 2978 2979 return (error); 2980 } 2981 2982 int 2983 mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 2984 struct ifnet *ifnet) 2985 { 2986 char *elements, *buffer; 2987 struct mac mac; 2988 int error; 2989 2990 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 2991 if (error) 2992 return (error); 2993 2994 error = mac_check_structmac_consistent(&mac); 2995 if (error) 2996 return (error); 2997 2998 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2999 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3000 if (error) { 3001 free(elements, M_MACTEMP); 3002 return (error); 3003 } 3004 3005 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3006 error = mac_externalize_ifnet_label(&ifnet->if_label, elements, 3007 buffer, mac.m_buflen, M_WAITOK); 3008 if (error == 0) 3009 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3010 3011 free(buffer, M_MACTEMP); 3012 free(elements, M_MACTEMP); 3013 3014 return (error); 3015 } 3016 3017 int 3018 mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 3019 struct ifnet *ifnet) 3020 { 3021 struct label intlabel; 3022 struct mac mac; 3023 char *buffer; 3024 int error; 3025 3026 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 3027 if (error) 3028 return (error); 3029 3030 error = mac_check_structmac_consistent(&mac); 3031 if (error) 3032 return (error); 3033 3034 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3035 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3036 if (error) { 3037 free(buffer, M_MACTEMP); 3038 return (error); 3039 } 3040 3041 mac_init_ifnet_label(&intlabel); 3042 error = mac_internalize_ifnet_label(&intlabel, buffer); 3043 free(buffer, M_MACTEMP); 3044 if (error) { 3045 mac_destroy_ifnet_label(&intlabel); 3046 return (error); 3047 } 3048 3049 /* 3050 * XXX: Note that this is a redundant privilege check, since 3051 * policies impose this check themselves if required by the 3052 * policy. Eventually, this should go away. 3053 */ 3054 error = suser_cred(cred, 0); 3055 if (error) { 3056 mac_destroy_ifnet_label(&intlabel); 3057 return (error); 3058 } 3059 3060 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label, 3061 &intlabel); 3062 if (error) { 3063 mac_destroy_ifnet_label(&intlabel); 3064 return (error); 3065 } 3066 3067 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel); 3068 3069 mac_destroy_ifnet_label(&intlabel); 3070 return (0); 3071 } 3072 3073 void 3074 mac_create_devfs_device(struct mount *mp, dev_t dev, struct devfs_dirent *de) 3075 { 3076 3077 MAC_PERFORM(create_devfs_device, mp, dev, de, &de->de_label); 3078 } 3079 3080 void 3081 mac_create_devfs_symlink(struct ucred *cred, struct mount *mp, 3082 struct devfs_dirent *dd, struct devfs_dirent *de) 3083 { 3084 3085 MAC_PERFORM(create_devfs_symlink, cred, mp, dd, &dd->de_label, de, 3086 &de->de_label); 3087 } 3088 3089 void 3090 mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen, 3091 struct devfs_dirent *de) 3092 { 3093 3094 MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de, 3095 &de->de_label); 3096 } 3097 3098 int 3099 mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 3100 struct mac *mac) 3101 { 3102 struct label intlabel; 3103 char *buffer; 3104 int error; 3105 3106 error = mac_check_structmac_consistent(mac); 3107 if (error) 3108 return (error); 3109 3110 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3111 error = copyinstr(mac->m_string, buffer, mac->m_buflen, NULL); 3112 if (error) { 3113 free(buffer, M_MACTEMP); 3114 return (error); 3115 } 3116 3117 mac_init_socket_label(&intlabel, M_WAITOK); 3118 error = mac_internalize_socket_label(&intlabel, buffer); 3119 free(buffer, M_MACTEMP); 3120 if (error) { 3121 mac_destroy_socket_label(&intlabel); 3122 return (error); 3123 } 3124 3125 mac_check_socket_relabel(cred, so, &intlabel); 3126 if (error) { 3127 mac_destroy_socket_label(&intlabel); 3128 return (error); 3129 } 3130 3131 mac_relabel_socket(cred, so, &intlabel); 3132 3133 mac_destroy_socket_label(&intlabel); 3134 return (0); 3135 } 3136 3137 int 3138 mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) 3139 { 3140 int error; 3141 3142 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 3143 3144 error = mac_check_pipe_relabel(cred, pipe, label); 3145 if (error) 3146 return (error); 3147 3148 mac_relabel_pipe(cred, pipe, label); 3149 3150 return (0); 3151 } 3152 3153 int 3154 mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 3155 struct mac *mac) 3156 { 3157 char *buffer, *elements; 3158 int error; 3159 3160 error = mac_check_structmac_consistent(mac); 3161 if (error) 3162 return (error); 3163 3164 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3165 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 3166 if (error) { 3167 free(elements, M_MACTEMP); 3168 return (error); 3169 } 3170 3171 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3172 error = mac_externalize_socket_label(&so->so_label, elements, 3173 buffer, mac->m_buflen, M_WAITOK); 3174 if (error == 0) 3175 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 3176 3177 free(buffer, M_MACTEMP); 3178 free(elements, M_MACTEMP); 3179 3180 return (error); 3181 } 3182 3183 int 3184 mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 3185 struct mac *mac) 3186 { 3187 char *elements, *buffer; 3188 int error; 3189 3190 error = mac_check_structmac_consistent(mac); 3191 if (error) 3192 return (error); 3193 3194 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3195 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 3196 if (error) { 3197 free(elements, M_MACTEMP); 3198 return (error); 3199 } 3200 3201 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3202 error = mac_externalize_socket_peer_label(&so->so_peerlabel, 3203 elements, buffer, mac->m_buflen, M_WAITOK); 3204 if (error == 0) 3205 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 3206 3207 free(buffer, M_MACTEMP); 3208 free(elements, M_MACTEMP); 3209 3210 return (error); 3211 } 3212 3213 /* 3214 * Implementation of VOP_SETLABEL() that relies on extended attributes 3215 * to store label data. Can be referenced by filesystems supporting 3216 * extended attributes. 3217 */ 3218 int 3219 vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 3220 { 3221 struct vnode *vp = ap->a_vp; 3222 struct label *intlabel = ap->a_label; 3223 int error; 3224 3225 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 3226 3227 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3228 return (EOPNOTSUPP); 3229 3230 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); 3231 if (error) 3232 return (error); 3233 3234 mac_relabel_vnode(ap->a_cred, vp, intlabel); 3235 3236 return (0); 3237 } 3238 3239 static int 3240 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 3241 { 3242 int error; 3243 3244 if (vp->v_mount == NULL) { 3245 /* printf("vn_setlabel: null v_mount\n"); */ 3246 if (vp->v_type != VNON) 3247 printf("vn_setlabel: null v_mount with non-VNON\n"); 3248 return (EBADF); 3249 } 3250 3251 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3252 return (EOPNOTSUPP); 3253 3254 /* 3255 * Multi-phase commit. First check the policies to confirm the 3256 * change is OK. Then commit via the filesystem. Finally, 3257 * update the actual vnode label. Question: maybe the filesystem 3258 * should update the vnode at the end as part of VOP_SETLABEL()? 3259 */ 3260 error = mac_check_vnode_relabel(cred, vp, intlabel); 3261 if (error) 3262 return (error); 3263 3264 /* 3265 * VADMIN provides the opportunity for the filesystem to make 3266 * decisions about who is and is not able to modify labels 3267 * and protections on files. This might not be right. We can't 3268 * assume VOP_SETLABEL() will do it, because we might implement 3269 * that as part of vop_stdsetlabel_ea(). 3270 */ 3271 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 3272 if (error) 3273 return (error); 3274 3275 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 3276 if (error) 3277 return (error); 3278 3279 return (0); 3280 } 3281 3282 int 3283 __mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3284 { 3285 char *elements, *buffer; 3286 struct mac mac; 3287 struct proc *tproc; 3288 struct ucred *tcred; 3289 int error; 3290 3291 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3292 if (error) 3293 return (error); 3294 3295 error = mac_check_structmac_consistent(&mac); 3296 if (error) 3297 return (error); 3298 3299 tproc = pfind(uap->pid); 3300 if (tproc == NULL) 3301 return (ESRCH); 3302 3303 tcred = NULL; /* Satisfy gcc. */ 3304 error = p_cansee(td, tproc); 3305 if (error == 0) 3306 tcred = crhold(tproc->p_ucred); 3307 PROC_UNLOCK(tproc); 3308 if (error) 3309 return (error); 3310 3311 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3312 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3313 if (error) { 3314 free(elements, M_MACTEMP); 3315 crfree(tcred); 3316 return (error); 3317 } 3318 3319 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3320 error = mac_externalize_cred_label(&tcred->cr_label, elements, 3321 buffer, mac.m_buflen, M_WAITOK); 3322 if (error == 0) 3323 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3324 3325 free(buffer, M_MACTEMP); 3326 free(elements, M_MACTEMP); 3327 crfree(tcred); 3328 return (error); 3329 } 3330 3331 /* 3332 * MPSAFE 3333 */ 3334 int 3335 __mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3336 { 3337 char *elements, *buffer; 3338 struct mac mac; 3339 int error; 3340 3341 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3342 if (error) 3343 return (error); 3344 3345 error = mac_check_structmac_consistent(&mac); 3346 if (error) 3347 return (error); 3348 3349 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3350 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3351 if (error) { 3352 free(elements, M_MACTEMP); 3353 return (error); 3354 } 3355 3356 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3357 error = mac_externalize_cred_label(&td->td_ucred->cr_label, 3358 elements, buffer, mac.m_buflen, M_WAITOK); 3359 if (error == 0) 3360 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3361 3362 free(buffer, M_MACTEMP); 3363 free(elements, M_MACTEMP); 3364 return (error); 3365 } 3366 3367 /* 3368 * MPSAFE 3369 */ 3370 int 3371 __mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3372 { 3373 struct ucred *newcred, *oldcred; 3374 struct label intlabel; 3375 struct proc *p; 3376 struct mac mac; 3377 char *buffer; 3378 int error; 3379 3380 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3381 if (error) 3382 return (error); 3383 3384 error = mac_check_structmac_consistent(&mac); 3385 if (error) 3386 return (error); 3387 3388 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3389 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3390 if (error) { 3391 free(buffer, M_MACTEMP); 3392 return (error); 3393 } 3394 3395 mac_init_cred_label(&intlabel); 3396 error = mac_internalize_cred_label(&intlabel, buffer); 3397 free(buffer, M_MACTEMP); 3398 if (error) { 3399 mac_destroy_cred_label(&intlabel); 3400 return (error); 3401 } 3402 3403 newcred = crget(); 3404 3405 p = td->td_proc; 3406 PROC_LOCK(p); 3407 oldcred = p->p_ucred; 3408 3409 error = mac_check_cred_relabel(oldcred, &intlabel); 3410 if (error) { 3411 PROC_UNLOCK(p); 3412 crfree(newcred); 3413 goto out; 3414 } 3415 3416 setsugid(p); 3417 crcopy(newcred, oldcred); 3418 mac_relabel_cred(newcred, &intlabel); 3419 p->p_ucred = newcred; 3420 3421 /* 3422 * Grab additional reference for use while revoking mmaps, prior 3423 * to releasing the proc lock and sharing the cred. 3424 */ 3425 crhold(newcred); 3426 PROC_UNLOCK(p); 3427 3428 if (mac_enforce_vm) { 3429 mtx_lock(&Giant); 3430 mac_cred_mmapped_drop_perms(td, newcred); 3431 mtx_unlock(&Giant); 3432 } 3433 3434 crfree(newcred); /* Free revocation reference. */ 3435 crfree(oldcred); 3436 3437 out: 3438 mac_destroy_cred_label(&intlabel); 3439 return (error); 3440 } 3441 3442 /* 3443 * MPSAFE 3444 */ 3445 int 3446 __mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3447 { 3448 char *elements, *buffer; 3449 struct label intlabel; 3450 struct file *fp; 3451 struct mac mac; 3452 struct vnode *vp; 3453 struct pipe *pipe; 3454 short label_type; 3455 int error; 3456 3457 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3458 if (error) 3459 return (error); 3460 3461 error = mac_check_structmac_consistent(&mac); 3462 if (error) 3463 return (error); 3464 3465 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3466 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3467 if (error) { 3468 free(elements, M_MACTEMP); 3469 return (error); 3470 } 3471 3472 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3473 mtx_lock(&Giant); /* VFS */ 3474 error = fget(td, uap->fd, &fp); 3475 if (error) 3476 goto out; 3477 3478 label_type = fp->f_type; 3479 switch (fp->f_type) { 3480 case DTYPE_FIFO: 3481 case DTYPE_VNODE: 3482 vp = fp->f_vnode; 3483 3484 mac_init_vnode_label(&intlabel); 3485 3486 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3487 mac_copy_vnode_label(&vp->v_label, &intlabel); 3488 VOP_UNLOCK(vp, 0, td); 3489 3490 break; 3491 case DTYPE_PIPE: 3492 pipe = fp->f_data; 3493 3494 mac_init_pipe_label(&intlabel); 3495 3496 PIPE_LOCK(pipe); 3497 mac_copy_pipe_label(pipe->pipe_label, &intlabel); 3498 PIPE_UNLOCK(pipe); 3499 break; 3500 default: 3501 error = EINVAL; 3502 fdrop(fp, td); 3503 goto out; 3504 } 3505 fdrop(fp, td); 3506 3507 switch (label_type) { 3508 case DTYPE_FIFO: 3509 case DTYPE_VNODE: 3510 if (error == 0) 3511 error = mac_externalize_vnode_label(&intlabel, 3512 elements, buffer, mac.m_buflen, M_WAITOK); 3513 mac_destroy_vnode_label(&intlabel); 3514 break; 3515 case DTYPE_PIPE: 3516 error = mac_externalize_pipe_label(&intlabel, elements, 3517 buffer, mac.m_buflen, M_WAITOK); 3518 mac_destroy_pipe_label(&intlabel); 3519 break; 3520 default: 3521 panic("__mac_get_fd: corrupted label_type"); 3522 } 3523 3524 if (error == 0) 3525 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3526 3527 out: 3528 mtx_unlock(&Giant); /* VFS */ 3529 free(buffer, M_MACTEMP); 3530 free(elements, M_MACTEMP); 3531 3532 return (error); 3533 } 3534 3535 /* 3536 * MPSAFE 3537 */ 3538 int 3539 __mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3540 { 3541 char *elements, *buffer; 3542 struct nameidata nd; 3543 struct label intlabel; 3544 struct mac mac; 3545 int error; 3546 3547 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3548 if (error) 3549 return (error); 3550 3551 error = mac_check_structmac_consistent(&mac); 3552 if (error) 3553 return (error); 3554 3555 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3556 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3557 if (error) { 3558 free(elements, M_MACTEMP); 3559 return (error); 3560 } 3561 3562 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3563 mtx_lock(&Giant); /* VFS */ 3564 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3565 td); 3566 error = namei(&nd); 3567 if (error) 3568 goto out; 3569 3570 mac_init_vnode_label(&intlabel); 3571 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3572 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3573 mac.m_buflen, M_WAITOK); 3574 3575 NDFREE(&nd, 0); 3576 mac_destroy_vnode_label(&intlabel); 3577 3578 if (error == 0) 3579 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3580 3581 out: 3582 mtx_unlock(&Giant); /* VFS */ 3583 3584 free(buffer, M_MACTEMP); 3585 free(elements, M_MACTEMP); 3586 3587 return (error); 3588 } 3589 3590 /* 3591 * MPSAFE 3592 */ 3593 int 3594 __mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3595 { 3596 char *elements, *buffer; 3597 struct nameidata nd; 3598 struct label intlabel; 3599 struct mac mac; 3600 int error; 3601 3602 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3603 if (error) 3604 return (error); 3605 3606 error = mac_check_structmac_consistent(&mac); 3607 if (error) 3608 return (error); 3609 3610 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3611 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3612 if (error) { 3613 free(elements, M_MACTEMP); 3614 return (error); 3615 } 3616 3617 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3618 mtx_lock(&Giant); /* VFS */ 3619 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3620 td); 3621 error = namei(&nd); 3622 if (error) 3623 goto out; 3624 3625 mac_init_vnode_label(&intlabel); 3626 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3627 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3628 mac.m_buflen, M_WAITOK); 3629 NDFREE(&nd, 0); 3630 mac_destroy_vnode_label(&intlabel); 3631 3632 if (error == 0) 3633 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3634 3635 out: 3636 mtx_unlock(&Giant); /* VFS */ 3637 3638 free(buffer, M_MACTEMP); 3639 free(elements, M_MACTEMP); 3640 3641 return (error); 3642 } 3643 3644 /* 3645 * MPSAFE 3646 */ 3647 int 3648 __mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3649 { 3650 struct label intlabel; 3651 struct pipe *pipe; 3652 struct file *fp; 3653 struct mount *mp; 3654 struct vnode *vp; 3655 struct mac mac; 3656 char *buffer; 3657 int error; 3658 3659 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3660 if (error) 3661 return (error); 3662 3663 error = mac_check_structmac_consistent(&mac); 3664 if (error) 3665 return (error); 3666 3667 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3668 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3669 if (error) { 3670 free(buffer, M_MACTEMP); 3671 return (error); 3672 } 3673 3674 mtx_lock(&Giant); /* VFS */ 3675 3676 error = fget(td, uap->fd, &fp); 3677 if (error) 3678 goto out; 3679 3680 switch (fp->f_type) { 3681 case DTYPE_FIFO: 3682 case DTYPE_VNODE: 3683 mac_init_vnode_label(&intlabel); 3684 error = mac_internalize_vnode_label(&intlabel, buffer); 3685 if (error) { 3686 mac_destroy_vnode_label(&intlabel); 3687 break; 3688 } 3689 3690 vp = fp->f_vnode; 3691 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3692 if (error != 0) { 3693 mac_destroy_vnode_label(&intlabel); 3694 break; 3695 } 3696 3697 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3698 error = vn_setlabel(vp, &intlabel, td->td_ucred); 3699 VOP_UNLOCK(vp, 0, td); 3700 vn_finished_write(mp); 3701 3702 mac_destroy_vnode_label(&intlabel); 3703 break; 3704 3705 case DTYPE_PIPE: 3706 mac_init_pipe_label(&intlabel); 3707 error = mac_internalize_pipe_label(&intlabel, buffer); 3708 if (error == 0) { 3709 pipe = fp->f_data; 3710 PIPE_LOCK(pipe); 3711 error = mac_pipe_label_set(td->td_ucred, pipe, 3712 &intlabel); 3713 PIPE_UNLOCK(pipe); 3714 } 3715 3716 mac_destroy_pipe_label(&intlabel); 3717 break; 3718 3719 default: 3720 error = EINVAL; 3721 } 3722 3723 fdrop(fp, td); 3724 out: 3725 mtx_unlock(&Giant); /* VFS */ 3726 3727 free(buffer, M_MACTEMP); 3728 3729 return (error); 3730 } 3731 3732 /* 3733 * MPSAFE 3734 */ 3735 int 3736 __mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3737 { 3738 struct label intlabel; 3739 struct nameidata nd; 3740 struct mount *mp; 3741 struct mac mac; 3742 char *buffer; 3743 int error; 3744 3745 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3746 if (error) 3747 return (error); 3748 3749 error = mac_check_structmac_consistent(&mac); 3750 if (error) 3751 return (error); 3752 3753 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3754 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3755 if (error) { 3756 free(buffer, M_MACTEMP); 3757 return (error); 3758 } 3759 3760 mac_init_vnode_label(&intlabel); 3761 error = mac_internalize_vnode_label(&intlabel, buffer); 3762 free(buffer, M_MACTEMP); 3763 if (error) { 3764 mac_destroy_vnode_label(&intlabel); 3765 return (error); 3766 } 3767 3768 mtx_lock(&Giant); /* VFS */ 3769 3770 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3771 td); 3772 error = namei(&nd); 3773 if (error == 0) { 3774 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3775 if (error == 0) 3776 error = vn_setlabel(nd.ni_vp, &intlabel, 3777 td->td_ucred); 3778 vn_finished_write(mp); 3779 } 3780 3781 NDFREE(&nd, 0); 3782 mtx_unlock(&Giant); /* VFS */ 3783 mac_destroy_vnode_label(&intlabel); 3784 3785 return (error); 3786 } 3787 3788 /* 3789 * MPSAFE 3790 */ 3791 int 3792 __mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3793 { 3794 struct label intlabel; 3795 struct nameidata nd; 3796 struct mount *mp; 3797 struct mac mac; 3798 char *buffer; 3799 int error; 3800 3801 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3802 if (error) 3803 return (error); 3804 3805 error = mac_check_structmac_consistent(&mac); 3806 if (error) 3807 return (error); 3808 3809 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3810 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3811 if (error) { 3812 free(buffer, M_MACTEMP); 3813 return (error); 3814 } 3815 3816 mac_init_vnode_label(&intlabel); 3817 error = mac_internalize_vnode_label(&intlabel, buffer); 3818 free(buffer, M_MACTEMP); 3819 if (error) { 3820 mac_destroy_vnode_label(&intlabel); 3821 return (error); 3822 } 3823 3824 mtx_lock(&Giant); /* VFS */ 3825 3826 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3827 td); 3828 error = namei(&nd); 3829 if (error == 0) { 3830 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3831 if (error == 0) 3832 error = vn_setlabel(nd.ni_vp, &intlabel, 3833 td->td_ucred); 3834 vn_finished_write(mp); 3835 } 3836 3837 NDFREE(&nd, 0); 3838 mtx_unlock(&Giant); /* VFS */ 3839 mac_destroy_vnode_label(&intlabel); 3840 3841 return (error); 3842 } 3843 3844 /* 3845 * MPSAFE 3846 */ 3847 int 3848 mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3849 { 3850 struct mac_policy_conf *mpc; 3851 char target[MAC_MAX_POLICY_NAME]; 3852 int entrycount, error; 3853 3854 error = copyinstr(uap->policy, target, sizeof(target), NULL); 3855 if (error) 3856 return (error); 3857 3858 error = ENOSYS; 3859 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { 3860 if (strcmp(mpc->mpc_name, target) == 0 && 3861 mpc->mpc_ops->mpo_syscall != NULL) { 3862 error = mpc->mpc_ops->mpo_syscall(td, 3863 uap->call, uap->arg); 3864 goto out; 3865 } 3866 } 3867 3868 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { 3869 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3870 if (strcmp(mpc->mpc_name, target) == 0 && 3871 mpc->mpc_ops->mpo_syscall != NULL) { 3872 error = mpc->mpc_ops->mpo_syscall(td, 3873 uap->call, uap->arg); 3874 break; 3875 } 3876 } 3877 mac_policy_list_unbusy(); 3878 } 3879 out: 3880 return (error); 3881 } 3882 3883 SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); 3884 SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); 3885 3886 #else /* !MAC */ 3887 3888 int 3889 __mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3890 { 3891 3892 return (ENOSYS); 3893 } 3894 3895 int 3896 __mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3897 { 3898 3899 return (ENOSYS); 3900 } 3901 3902 int 3903 __mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3904 { 3905 3906 return (ENOSYS); 3907 } 3908 3909 int 3910 __mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3911 { 3912 3913 return (ENOSYS); 3914 } 3915 3916 int 3917 __mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3918 { 3919 3920 return (ENOSYS); 3921 } 3922 3923 int 3924 __mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3925 { 3926 3927 return (ENOSYS); 3928 } 3929 3930 int 3931 __mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3932 { 3933 3934 return (ENOSYS); 3935 } 3936 3937 int 3938 __mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3939 { 3940 3941 return (ENOSYS); 3942 } 3943 3944 int 3945 __mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3946 { 3947 3948 return (ENOSYS); 3949 } 3950 3951 int 3952 mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3953 { 3954 3955 return (ENOSYS); 3956 } 3957 3958 #endif 3959