mac_internal.h revision 119184
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: head/sys/security/mac/mac_internal.h 119184 2003-08-20 19:16:49Z rwatson $"); 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 */ 95MODULE_VERSION(kernel_mac_support, 1); 96 97SYSCTL_DECL(_security); 98 99SYSCTL_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 106static unsigned int mac_max_slots = MAC_MAX_SLOTS; 107static unsigned int mac_slot_offsets_free = (1 << MAC_MAX_SLOTS) - 1; 108SYSCTL_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 */ 116static int mac_late = 0; 117 118/* 119 * Warn about EA transactions only the first time they happen. 120 * Weak coherency, no locking. 121 */ 122static 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 136static int mac_labelmbufs = 0; 137#endif 138 139static int mac_enforce_fs = 1; 140SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW, 141 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects"); 142TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs); 143 144static int mac_enforce_kld = 1; 145SYSCTL_INT(_security_mac, OID_AUTO, enforce_kld, CTLFLAG_RW, 146 &mac_enforce_kld, 0, "Enforce MAC policy on kld operations"); 147TUNABLE_INT("security.mac.enforce_kld", &mac_enforce_kld); 148 149static int mac_enforce_network = 1; 150SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW, 151 &mac_enforce_network, 0, "Enforce MAC policy on network packets"); 152TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network); 153 154static int mac_enforce_pipe = 1; 155SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW, 156 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations"); 157TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe); 158 159static int mac_enforce_process = 1; 160SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW, 161 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations"); 162TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process); 163 164static int mac_enforce_socket = 1; 165SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW, 166 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations"); 167TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket); 168 169static int mac_enforce_system = 1; 170SYSCTL_INT(_security_mac, OID_AUTO, enforce_system, CTLFLAG_RW, 171 &mac_enforce_system, 0, "Enforce MAC policy on system operations"); 172TUNABLE_INT("security.mac.enforce_system", &mac_enforce_system); 173 174static int mac_enforce_vm = 1; 175SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW, 176 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations"); 177TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm); 178 179static int mac_mmap_revocation = 1; 180SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW, 181 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject " 182 "relabel"); 183static int mac_mmap_revocation_via_cow = 0; 184SYSCTL_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 189SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0, 190 "TrustedBSD MAC debug info"); 191 192static int mac_debug_label_fallback = 0; 193SYSCTL_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."); 196TUNABLE_INT("security.mac.debug_label_fallback", 197 &mac_debug_label_fallback); 198 199SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0, 200 "TrustedBSD MAC object counters"); 201 202static 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 209SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD, 210 &nmacmbufs, 0, "number of mbufs in use"); 211SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD, 212 &nmaccreds, 0, "number of ucreds in use"); 213SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD, 214 &nmacifnets, 0, "number of ifnets in use"); 215SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD, 216 &nmacipqs, 0, "number of ipqs in use"); 217SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD, 218 &nmacbpfdescs, 0, "number of bpfdescs in use"); 219SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD, 220 &nmacsockets, 0, "number of sockets in use"); 221SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD, 222 &nmacpipes, 0, "number of pipes in use"); 223SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, procs, CTLFLAG_RD, 224 &nmacprocs, 0, "number of procs in use"); 225SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD, 226 &nmacmounts, 0, "number of mounts in use"); 227SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD, 228 &nmactemp, 0, "number of temporary labels in use"); 229SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD, 230 &nmacvnodes, 0, "number of vnodes in use"); 231SYSCTL_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 238static int error_select(int error1, int error2); 239static int mac_policy_register(struct mac_policy_conf *mpc); 240static int mac_policy_unregister(struct mac_policy_conf *mpc); 241 242static void mac_check_vnode_mmap_downgrade(struct ucred *cred, 243 struct vnode *vp, int *prot); 244static void mac_cred_mmapped_drop_perms_recurse(struct thread *td, 245 struct ucred *cred, struct vm_map *map); 246 247static void mac_destroy_socket_label(struct label *label); 248 249static int mac_setlabel_vnode_extattr(struct ucred *cred, 250 struct vnode *vp, struct label *intlabel); 251 252MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes"); 253MALLOC_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 */ 273static struct mtx mac_policy_mtx; 274static struct cv mac_policy_cv; 275static int mac_policy_count; 276static LIST_HEAD(, mac_policy_conf) mac_policy_list; 277static 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 */ 288static __inline void 289mac_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 298static __inline void 299mac_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 306static __inline void 307mac_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 316static __inline void 317mac_policy_list_busy(void) 318{ 319 mtx_lock(&mac_policy_mtx); 320 mac_policy_count++; 321 mtx_unlock(&mac_policy_mtx); 322} 323 324static __inline int 325mac_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 339static __inline void 340mac_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 */ 498static void 499mac_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 */ 514static void 515mac_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 */ 527static void 528mac_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 */ 552int 553mac_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 587static int 588mac_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 657out: 658 mac_policy_release_exclusive(); 659 return (error); 660} 661 662static int 663mac_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 */ 712static int 713error_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 745static struct label * 746mbuf_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 757static void 758mac_init_label(struct label *label) 759{ 760 761 bzero(label, sizeof(*label)); 762 label->l_flags = MAC_FLAG_INITIALIZED; 763} 764 765static void 766mac_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 776void 777mac_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 785static void 786mac_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 794void 795mac_init_cred(struct ucred *cred) 796{ 797 798 mac_init_cred_label(&cred->cr_label); 799} 800 801void 802mac_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 810static void 811mac_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 819void 820mac_init_ifnet(struct ifnet *ifp) 821{ 822 823 mac_init_ifnet_label(&ifp->if_label); 824} 825 826int 827mac_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 843int 844mac_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 862int 863mac_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 891void 892mac_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 902static void 903mac_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 911void 912mac_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 922void 923mac_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 931static int 932mac_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 949static int 950mac_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 965int 966mac_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 981void 982mac_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 990void 991mac_init_vnode(struct vnode *vp) 992{ 993 994 mac_init_vnode_label(&vp->v_label); 995} 996 997void 998mac_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 1006static void 1007mac_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 1015void 1016mac_destroy_cred(struct ucred *cred) 1017{ 1018 1019 mac_destroy_cred_label(&cred->cr_label); 1020} 1021 1022void 1023mac_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 1031static void 1032mac_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 1040void 1041mac_destroy_ifnet(struct ifnet *ifp) 1042{ 1043 1044 mac_destroy_ifnet_label(&ifp->if_label); 1045} 1046 1047void 1048mac_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 1056void 1057mac_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 1068void 1069mac_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 1079static void 1080mac_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 1088void 1089mac_destroy_pipe(struct pipe *pipe) 1090{ 1091 1092 mac_destroy_pipe_label(pipe->pipe_label); 1093 free(pipe->pipe_label, M_MACPIPELABEL); 1094} 1095 1096void 1097mac_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 1105static void 1106mac_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 1114static void 1115mac_destroy_socket_peer_label(struct label *label) 1116{ 1117 1118 MAC_PERFORM(destroy_socket_peer_label, label); 1119 mac_destroy_label(label); 1120} 1121 1122void 1123mac_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 1130void 1131mac_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 1139void 1140mac_destroy_vnode(struct vnode *vp) 1141{ 1142 1143 mac_destroy_vnode_label(&vp->v_label); 1144} 1145 1146void 1147mac_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 1161static void 1162mac_copy_pipe_label(struct label *src, struct label *dest) 1163{ 1164 1165 MAC_PERFORM(copy_pipe_label, src, dest); 1166} 1167 1168void 1169mac_copy_vnode_label(struct label *src, struct label *dest) 1170{ 1171 1172 MAC_PERFORM(copy_vnode_label, src, dest); 1173} 1174 1175static int 1176mac_check_structmac_consistent(struct mac *mac) 1177{ 1178 1179 if (mac->m_buflen > MAC_MAX_LABEL_BUF_LEN) 1180 return (EINVAL); 1181 1182 return (0); 1183} 1184 1185static int 1186mac_externalize_cred_label(struct label *label, char *elements, 1187 char *outbuf, size_t outbuflen, int flags) 1188{ 1189 int error; 1190 1191 MAC_EXTERNALIZE(cred_label, label, elements, outbuf, outbuflen); 1192 1193 return (error); 1194} 1195 1196static int 1197mac_externalize_ifnet_label(struct label *label, char *elements, 1198 char *outbuf, size_t outbuflen, int flags) 1199{ 1200 int error; 1201 1202 MAC_EXTERNALIZE(ifnet_label, label, elements, outbuf, outbuflen); 1203 1204 return (error); 1205} 1206 1207static int 1208mac_externalize_pipe_label(struct label *label, char *elements, 1209 char *outbuf, size_t outbuflen, int flags) 1210{ 1211 int error; 1212 1213 MAC_EXTERNALIZE(pipe_label, label, elements, outbuf, outbuflen); 1214 1215 return (error); 1216} 1217 1218static int 1219mac_externalize_socket_label(struct label *label, char *elements, 1220 char *outbuf, size_t outbuflen, int flags) 1221{ 1222 int error; 1223 1224 MAC_EXTERNALIZE(socket_label, label, elements, outbuf, outbuflen); 1225 1226 return (error); 1227} 1228 1229static int 1230mac_externalize_socket_peer_label(struct label *label, char *elements, 1231 char *outbuf, size_t outbuflen, int flags) 1232{ 1233 int error; 1234 1235 MAC_EXTERNALIZE(socket_peer_label, label, elements, outbuf, outbuflen); 1236 1237 return (error); 1238} 1239 1240static int 1241mac_externalize_vnode_label(struct label *label, char *elements, 1242 char *outbuf, size_t outbuflen, int flags) 1243{ 1244 int error; 1245 1246 MAC_EXTERNALIZE(vnode_label, label, elements, outbuf, outbuflen); 1247 1248 return (error); 1249} 1250 1251static int 1252mac_internalize_cred_label(struct label *label, char *string) 1253{ 1254 int error; 1255 1256 MAC_INTERNALIZE(cred_label, label, string); 1257 1258 return (error); 1259} 1260 1261static int 1262mac_internalize_ifnet_label(struct label *label, char *string) 1263{ 1264 int error; 1265 1266 MAC_INTERNALIZE(ifnet_label, label, string); 1267 1268 return (error); 1269} 1270 1271static int 1272mac_internalize_pipe_label(struct label *label, char *string) 1273{ 1274 int error; 1275 1276 MAC_INTERNALIZE(pipe_label, label, string); 1277 1278 return (error); 1279} 1280 1281static int 1282mac_internalize_socket_label(struct label *label, char *string) 1283{ 1284 int error; 1285 1286 MAC_INTERNALIZE(socket_label, label, string); 1287 1288 return (error); 1289} 1290 1291static int 1292mac_internalize_vnode_label(struct label *label, char *string) 1293{ 1294 int error; 1295 1296 MAC_INTERNALIZE(vnode_label, label, string); 1297 1298 return (error); 1299} 1300 1301/* 1302 * Initialize MAC label for the first kernel process, from which other 1303 * kernel processes and threads are spawned. 1304 */ 1305void 1306mac_create_proc0(struct ucred *cred) 1307{ 1308 1309 MAC_PERFORM(create_proc0, cred); 1310} 1311 1312/* 1313 * Initialize MAC label for the first userland process, from which other 1314 * userland processes and threads are spawned. 1315 */ 1316void 1317mac_create_proc1(struct ucred *cred) 1318{ 1319 1320 MAC_PERFORM(create_proc1, cred); 1321} 1322 1323void 1324mac_thread_userret(struct thread *td) 1325{ 1326 1327 MAC_PERFORM(thread_userret, td); 1328} 1329 1330/* 1331 * When a new process is created, its label must be initialized. Generally, 1332 * this involves inheritence from the parent process, modulo possible 1333 * deltas. This function allows that processing to take place. 1334 */ 1335void 1336mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred) 1337{ 1338 1339 MAC_PERFORM(create_cred, parent_cred, child_cred); 1340} 1341 1342void 1343mac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de, 1344 struct vnode *vp) 1345{ 1346 1347 MAC_PERFORM(update_devfsdirent, mp, de, &de->de_label, vp, 1348 &vp->v_label); 1349} 1350 1351void 1352mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de, 1353 struct vnode *vp) 1354{ 1355 1356 MAC_PERFORM(associate_vnode_devfs, mp, &mp->mnt_fslabel, de, 1357 &de->de_label, vp, &vp->v_label); 1358} 1359 1360int 1361mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp) 1362{ 1363 int error; 1364 1365 ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr"); 1366 1367 MAC_CHECK(associate_vnode_extattr, mp, &mp->mnt_fslabel, vp, 1368 &vp->v_label); 1369 1370 return (error); 1371} 1372 1373void 1374mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp) 1375{ 1376 1377 MAC_PERFORM(associate_vnode_singlelabel, mp, &mp->mnt_fslabel, vp, 1378 &vp->v_label); 1379} 1380 1381int 1382mac_create_vnode_extattr(struct ucred *cred, struct mount *mp, 1383 struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 1384{ 1385 int error; 1386 1387 ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr"); 1388 ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr"); 1389 1390 error = VOP_OPENEXTATTR(vp, cred, curthread); 1391 if (error == EOPNOTSUPP) { 1392 /* XXX: Optionally abort if transactions not supported. */ 1393 if (ea_warn_once == 0) { 1394 printf("Warning: transactions not supported " 1395 "in EA write.\n"); 1396 ea_warn_once = 1; 1397 } 1398 } else if (error) 1399 return (error); 1400 1401 MAC_CHECK(create_vnode_extattr, cred, mp, &mp->mnt_fslabel, 1402 dvp, &dvp->v_label, vp, &vp->v_label, cnp); 1403 1404 if (error) { 1405 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 1406 return (error); 1407 } 1408 1409 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 1410 1411 if (error == EOPNOTSUPP) 1412 error = 0; /* XXX */ 1413 1414 return (error); 1415} 1416 1417static int 1418mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 1419 struct label *intlabel) 1420{ 1421 int error; 1422 1423 ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr"); 1424 1425 error = VOP_OPENEXTATTR(vp, cred, curthread); 1426 if (error == EOPNOTSUPP) { 1427 /* XXX: Optionally abort if transactions not supported. */ 1428 if (ea_warn_once == 0) { 1429 printf("Warning: transactions not supported " 1430 "in EA write.\n"); 1431 ea_warn_once = 1; 1432 } 1433 } else if (error) 1434 return (error); 1435 1436 MAC_CHECK(setlabel_vnode_extattr, cred, vp, &vp->v_label, intlabel); 1437 1438 if (error) { 1439 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 1440 return (error); 1441 } 1442 1443 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 1444 1445 if (error == EOPNOTSUPP) 1446 error = 0; /* XXX */ 1447 1448 return (error); 1449} 1450 1451int 1452mac_execve_enter(struct image_params *imgp, struct mac *mac_p, 1453 struct label *execlabelstorage) 1454{ 1455 struct mac mac; 1456 char *buffer; 1457 int error; 1458 1459 if (mac_p == NULL) 1460 return (0); 1461 1462 error = copyin(mac_p, &mac, sizeof(mac)); 1463 if (error) 1464 return (error); 1465 1466 error = mac_check_structmac_consistent(&mac); 1467 if (error) 1468 return (error); 1469 1470 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 1471 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 1472 if (error) { 1473 free(buffer, M_MACTEMP); 1474 return (error); 1475 } 1476 1477 mac_init_cred_label(execlabelstorage); 1478 error = mac_internalize_cred_label(execlabelstorage, buffer); 1479 free(buffer, M_MACTEMP); 1480 if (error) { 1481 mac_destroy_cred_label(execlabelstorage); 1482 return (error); 1483 } 1484 imgp->execlabel = execlabelstorage; 1485 return (0); 1486} 1487 1488void 1489mac_execve_exit(struct image_params *imgp) 1490{ 1491 if (imgp->execlabel != NULL) 1492 mac_destroy_cred_label(imgp->execlabel); 1493} 1494 1495void 1496mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, 1497 struct label *interpvnodelabel, struct image_params *imgp) 1498{ 1499 1500 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 1501 1502 if (!mac_enforce_process && !mac_enforce_fs) 1503 return; 1504 1505 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label, 1506 interpvnodelabel, imgp, imgp->execlabel); 1507} 1508 1509int 1510mac_execve_will_transition(struct ucred *old, struct vnode *vp, 1511 struct label *interpvnodelabel, struct image_params *imgp) 1512{ 1513 int result; 1514 1515 ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition"); 1516 1517 if (!mac_enforce_process && !mac_enforce_fs) 1518 return (0); 1519 1520 result = 0; 1521 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label, 1522 interpvnodelabel, imgp, imgp->execlabel); 1523 1524 return (result); 1525} 1526 1527int 1528mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode) 1529{ 1530 int error; 1531 1532 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 1533 1534 if (!mac_enforce_fs) 1535 return (0); 1536 1537 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, acc_mode); 1538 return (error); 1539} 1540 1541int 1542mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 1543{ 1544 int error; 1545 1546 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 1547 1548 if (!mac_enforce_fs) 1549 return (0); 1550 1551 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label); 1552 return (error); 1553} 1554 1555int 1556mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 1557{ 1558 int error; 1559 1560 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 1561 1562 if (!mac_enforce_fs) 1563 return (0); 1564 1565 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label); 1566 return (error); 1567} 1568 1569int 1570mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1571 struct componentname *cnp, struct vattr *vap) 1572{ 1573 int error; 1574 1575 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 1576 1577 if (!mac_enforce_fs) 1578 return (0); 1579 1580 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap); 1581 return (error); 1582} 1583 1584int 1585mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 1586 struct componentname *cnp) 1587{ 1588 int error; 1589 1590 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 1591 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 1592 1593 if (!mac_enforce_fs) 1594 return (0); 1595 1596 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp, 1597 &vp->v_label, cnp); 1598 return (error); 1599} 1600 1601int 1602mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1603 acl_type_t type) 1604{ 1605 int error; 1606 1607 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 1608 1609 if (!mac_enforce_fs) 1610 return (0); 1611 1612 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type); 1613 return (error); 1614} 1615 1616int 1617mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 1618 struct image_params *imgp) 1619{ 1620 int error; 1621 1622 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 1623 1624 if (!mac_enforce_process && !mac_enforce_fs) 1625 return (0); 1626 1627 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label, imgp, 1628 imgp->execlabel); 1629 1630 return (error); 1631} 1632 1633int 1634mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 1635{ 1636 int error; 1637 1638 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 1639 1640 if (!mac_enforce_fs) 1641 return (0); 1642 1643 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); 1644 return (error); 1645} 1646 1647int 1648mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1649 int attrnamespace, const char *name, struct uio *uio) 1650{ 1651 int error; 1652 1653 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 1654 1655 if (!mac_enforce_fs) 1656 return (0); 1657 1658 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, 1659 attrnamespace, name, uio); 1660 return (error); 1661} 1662 1663int 1664mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 1665 struct vnode *vp, struct componentname *cnp) 1666{ 1667 int error; 1668 1669 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 1670 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 1671 1672 if (!mac_enforce_fs) 1673 return (0); 1674 1675 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp, 1676 &vp->v_label, cnp); 1677 return (error); 1678} 1679 1680int 1681mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 1682 struct componentname *cnp) 1683{ 1684 int error; 1685 1686 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 1687 1688 if (!mac_enforce_fs) 1689 return (0); 1690 1691 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); 1692 return (error); 1693} 1694 1695int 1696mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot) 1697{ 1698 int error; 1699 1700 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 1701 1702 if (!mac_enforce_fs || !mac_enforce_vm) 1703 return (0); 1704 1705 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot); 1706 return (error); 1707} 1708 1709void 1710mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 1711{ 1712 int result = *prot; 1713 1714 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 1715 1716 if (!mac_enforce_fs || !mac_enforce_vm) 1717 return; 1718 1719 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label, 1720 &result); 1721 1722 *prot = result; 1723} 1724 1725int 1726mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 1727{ 1728 int error; 1729 1730 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 1731 1732 if (!mac_enforce_fs || !mac_enforce_vm) 1733 return (0); 1734 1735 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot); 1736 return (error); 1737} 1738 1739int 1740mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 1741{ 1742 int error; 1743 1744 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 1745 1746 if (!mac_enforce_fs) 1747 return (0); 1748 1749 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); 1750 return (error); 1751} 1752 1753int 1754mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 1755 struct vnode *vp) 1756{ 1757 int error; 1758 1759 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 1760 1761 if (!mac_enforce_fs) 1762 return (0); 1763 1764 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 1765 &vp->v_label); 1766 1767 return (error); 1768} 1769 1770int 1771mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 1772 struct vnode *vp) 1773{ 1774 int error; 1775 1776 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 1777 1778 if (!mac_enforce_fs) 1779 return (0); 1780 1781 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 1782 &vp->v_label); 1783 1784 return (error); 1785} 1786 1787int 1788mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 1789{ 1790 int error; 1791 1792 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 1793 1794 if (!mac_enforce_fs) 1795 return (0); 1796 1797 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); 1798 return (error); 1799} 1800 1801int 1802mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 1803{ 1804 int error; 1805 1806 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 1807 1808 if (!mac_enforce_fs) 1809 return (0); 1810 1811 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); 1812 return (error); 1813} 1814 1815static int 1816mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 1817 struct label *newlabel) 1818{ 1819 int error; 1820 1821 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 1822 1823 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); 1824 1825 return (error); 1826} 1827 1828int 1829mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 1830 struct vnode *vp, struct componentname *cnp) 1831{ 1832 int error; 1833 1834 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 1835 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 1836 1837 if (!mac_enforce_fs) 1838 return (0); 1839 1840 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, 1841 &vp->v_label, cnp); 1842 return (error); 1843} 1844 1845int 1846mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 1847 struct vnode *vp, int samedir, struct componentname *cnp) 1848{ 1849 int error; 1850 1851 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 1852 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 1853 1854 if (!mac_enforce_fs) 1855 return (0); 1856 1857 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, 1858 vp != NULL ? &vp->v_label : NULL, samedir, cnp); 1859 return (error); 1860} 1861 1862int 1863mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 1864{ 1865 int error; 1866 1867 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 1868 1869 if (!mac_enforce_fs) 1870 return (0); 1871 1872 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); 1873 return (error); 1874} 1875 1876int 1877mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 1878 struct acl *acl) 1879{ 1880 int error; 1881 1882 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 1883 1884 if (!mac_enforce_fs) 1885 return (0); 1886 1887 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); 1888 return (error); 1889} 1890 1891int 1892mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 1893 int attrnamespace, const char *name, struct uio *uio) 1894{ 1895 int error; 1896 1897 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 1898 1899 if (!mac_enforce_fs) 1900 return (0); 1901 1902 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, 1903 attrnamespace, name, uio); 1904 return (error); 1905} 1906 1907int 1908mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 1909{ 1910 int error; 1911 1912 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 1913 1914 if (!mac_enforce_fs) 1915 return (0); 1916 1917 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); 1918 return (error); 1919} 1920 1921int 1922mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 1923{ 1924 int error; 1925 1926 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 1927 1928 if (!mac_enforce_fs) 1929 return (0); 1930 1931 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); 1932 return (error); 1933} 1934 1935int 1936mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 1937 gid_t gid) 1938{ 1939 int error; 1940 1941 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 1942 1943 if (!mac_enforce_fs) 1944 return (0); 1945 1946 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); 1947 return (error); 1948} 1949 1950int 1951mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 1952 struct timespec atime, struct timespec mtime) 1953{ 1954 int error; 1955 1956 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 1957 1958 if (!mac_enforce_fs) 1959 return (0); 1960 1961 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, 1962 mtime); 1963 return (error); 1964} 1965 1966int 1967mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 1968 struct vnode *vp) 1969{ 1970 int error; 1971 1972 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 1973 1974 if (!mac_enforce_fs) 1975 return (0); 1976 1977 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 1978 &vp->v_label); 1979 return (error); 1980} 1981 1982int 1983mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 1984 struct vnode *vp) 1985{ 1986 int error; 1987 1988 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 1989 1990 if (!mac_enforce_fs) 1991 return (0); 1992 1993 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 1994 &vp->v_label); 1995 1996 return (error); 1997} 1998 1999/* 2000 * When relabeling a process, call out to the policies for the maximum 2001 * permission allowed for each object type we know about in its 2002 * memory space, and revoke access (in the least surprising ways we 2003 * know) when necessary. The process lock is not held here. 2004 */ 2005void 2006mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) 2007{ 2008 2009 /* XXX freeze all other threads */ 2010 mac_cred_mmapped_drop_perms_recurse(td, cred, 2011 &td->td_proc->p_vmspace->vm_map); 2012 /* XXX allow other threads to continue */ 2013} 2014 2015static __inline const char * 2016prot2str(vm_prot_t prot) 2017{ 2018 2019 switch (prot & VM_PROT_ALL) { 2020 case VM_PROT_READ: 2021 return ("r--"); 2022 case VM_PROT_READ | VM_PROT_WRITE: 2023 return ("rw-"); 2024 case VM_PROT_READ | VM_PROT_EXECUTE: 2025 return ("r-x"); 2026 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 2027 return ("rwx"); 2028 case VM_PROT_WRITE: 2029 return ("-w-"); 2030 case VM_PROT_EXECUTE: 2031 return ("--x"); 2032 case VM_PROT_WRITE | VM_PROT_EXECUTE: 2033 return ("-wx"); 2034 default: 2035 return ("---"); 2036 } 2037} 2038 2039static void 2040mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, 2041 struct vm_map *map) 2042{ 2043 struct vm_map_entry *vme; 2044 int result; 2045 vm_prot_t revokeperms; 2046 vm_object_t object; 2047 vm_ooffset_t offset; 2048 struct vnode *vp; 2049 2050 if (!mac_mmap_revocation) 2051 return; 2052 2053 vm_map_lock_read(map); 2054 for (vme = map->header.next; vme != &map->header; vme = vme->next) { 2055 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { 2056 mac_cred_mmapped_drop_perms_recurse(td, cred, 2057 vme->object.sub_map); 2058 continue; 2059 } 2060 /* 2061 * Skip over entries that obviously are not shared. 2062 */ 2063 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || 2064 !vme->max_protection) 2065 continue; 2066 /* 2067 * Drill down to the deepest backing object. 2068 */ 2069 offset = vme->offset; 2070 object = vme->object.vm_object; 2071 if (object == NULL) 2072 continue; 2073 while (object->backing_object != NULL) { 2074 object = object->backing_object; 2075 offset += object->backing_object_offset; 2076 } 2077 /* 2078 * At the moment, vm_maps and objects aren't considered 2079 * by the MAC system, so only things with backing by a 2080 * normal object (read: vnodes) are checked. 2081 */ 2082 if (object->type != OBJT_VNODE) 2083 continue; 2084 vp = (struct vnode *)object->handle; 2085 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2086 result = vme->max_protection; 2087 mac_check_vnode_mmap_downgrade(cred, vp, &result); 2088 VOP_UNLOCK(vp, 0, td); 2089 /* 2090 * Find out what maximum protection we may be allowing 2091 * now but a policy needs to get removed. 2092 */ 2093 revokeperms = vme->max_protection & ~result; 2094 if (!revokeperms) 2095 continue; 2096 printf("pid %ld: revoking %s perms from %#lx:%ld " 2097 "(max %s/cur %s)\n", (long)td->td_proc->p_pid, 2098 prot2str(revokeperms), (u_long)vme->start, 2099 (long)(vme->end - vme->start), 2100 prot2str(vme->max_protection), prot2str(vme->protection)); 2101 vm_map_lock_upgrade(map); 2102 /* 2103 * This is the really simple case: if a map has more 2104 * max_protection than is allowed, but it's not being 2105 * actually used (that is, the current protection is 2106 * still allowed), we can just wipe it out and do 2107 * nothing more. 2108 */ 2109 if ((vme->protection & revokeperms) == 0) { 2110 vme->max_protection -= revokeperms; 2111 } else { 2112 if (revokeperms & VM_PROT_WRITE) { 2113 /* 2114 * In the more complicated case, flush out all 2115 * pending changes to the object then turn it 2116 * copy-on-write. 2117 */ 2118 vm_object_reference(object); 2119 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2120 VM_OBJECT_LOCK(object); 2121 vm_object_page_clean(object, 2122 OFF_TO_IDX(offset), 2123 OFF_TO_IDX(offset + vme->end - vme->start + 2124 PAGE_MASK), 2125 OBJPC_SYNC); 2126 VM_OBJECT_UNLOCK(object); 2127 VOP_UNLOCK(vp, 0, td); 2128 vm_object_deallocate(object); 2129 /* 2130 * Why bother if there's no read permissions 2131 * anymore? For the rest, we need to leave 2132 * the write permissions on for COW, or 2133 * remove them entirely if configured to. 2134 */ 2135 if (!mac_mmap_revocation_via_cow) { 2136 vme->max_protection &= ~VM_PROT_WRITE; 2137 vme->protection &= ~VM_PROT_WRITE; 2138 } if ((revokeperms & VM_PROT_READ) == 0) 2139 vme->eflags |= MAP_ENTRY_COW | 2140 MAP_ENTRY_NEEDS_COPY; 2141 } 2142 if (revokeperms & VM_PROT_EXECUTE) { 2143 vme->max_protection &= ~VM_PROT_EXECUTE; 2144 vme->protection &= ~VM_PROT_EXECUTE; 2145 } 2146 if (revokeperms & VM_PROT_READ) { 2147 vme->max_protection = 0; 2148 vme->protection = 0; 2149 } 2150 pmap_protect(map->pmap, vme->start, vme->end, 2151 vme->protection & ~revokeperms); 2152 vm_map_simplify_entry(map, vme); 2153 } 2154 vm_map_lock_downgrade(map); 2155 } 2156 vm_map_unlock_read(map); 2157} 2158 2159/* 2160 * When the subject's label changes, it may require revocation of privilege 2161 * to mapped objects. This can't be done on-the-fly later with a unified 2162 * buffer cache. 2163 */ 2164static void 2165mac_relabel_cred(struct ucred *cred, struct label *newlabel) 2166{ 2167 2168 MAC_PERFORM(relabel_cred, cred, newlabel); 2169} 2170 2171void 2172mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 2173{ 2174 2175 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); 2176} 2177 2178void 2179mac_create_ifnet(struct ifnet *ifnet) 2180{ 2181 2182 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label); 2183} 2184 2185void 2186mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d) 2187{ 2188 2189 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label); 2190} 2191 2192void 2193mac_create_socket(struct ucred *cred, struct socket *socket) 2194{ 2195 2196 MAC_PERFORM(create_socket, cred, socket, &socket->so_label); 2197} 2198 2199void 2200mac_create_pipe(struct ucred *cred, struct pipe *pipe) 2201{ 2202 2203 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); 2204} 2205 2206void 2207mac_create_socket_from_socket(struct socket *oldsocket, 2208 struct socket *newsocket) 2209{ 2210 2211 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label, 2212 newsocket, &newsocket->so_label); 2213} 2214 2215static void 2216mac_relabel_socket(struct ucred *cred, struct socket *socket, 2217 struct label *newlabel) 2218{ 2219 2220 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); 2221} 2222 2223static void 2224mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) 2225{ 2226 2227 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); 2228} 2229 2230void 2231mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) 2232{ 2233 struct label *label; 2234 2235 label = mbuf_to_label(mbuf); 2236 2237 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, label, socket, 2238 &socket->so_peerlabel); 2239} 2240 2241void 2242mac_set_socket_peer_from_socket(struct socket *oldsocket, 2243 struct socket *newsocket) 2244{ 2245 2246 MAC_PERFORM(set_socket_peer_from_socket, oldsocket, 2247 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel); 2248} 2249 2250void 2251mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram) 2252{ 2253 struct label *label; 2254 2255 label = mbuf_to_label(datagram); 2256 2257 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label, 2258 datagram, label); 2259} 2260 2261void 2262mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment) 2263{ 2264 struct label *datagramlabel, *fragmentlabel; 2265 2266 datagramlabel = mbuf_to_label(datagram); 2267 fragmentlabel = mbuf_to_label(fragment); 2268 2269 MAC_PERFORM(create_fragment, datagram, datagramlabel, fragment, 2270 fragmentlabel); 2271} 2272 2273void 2274mac_create_ipq(struct mbuf *fragment, struct ipq *ipq) 2275{ 2276 struct label *label; 2277 2278 label = mbuf_to_label(fragment); 2279 2280 MAC_PERFORM(create_ipq, fragment, label, ipq, &ipq->ipq_label); 2281} 2282 2283void 2284mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2285{ 2286 struct label *oldmbuflabel, *newmbuflabel; 2287 2288 oldmbuflabel = mbuf_to_label(oldmbuf); 2289 newmbuflabel = mbuf_to_label(newmbuf); 2290 2291 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, oldmbuflabel, newmbuf, 2292 newmbuflabel); 2293} 2294 2295void 2296mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf) 2297{ 2298 struct label *label; 2299 2300 label = mbuf_to_label(mbuf); 2301 2302 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf, 2303 label); 2304} 2305 2306void 2307mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf) 2308{ 2309 struct label *label; 2310 2311 label = mbuf_to_label(mbuf); 2312 2313 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf, 2314 label); 2315} 2316 2317void 2318mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf) 2319{ 2320 struct label *label; 2321 2322 label = mbuf_to_label(mbuf); 2323 2324 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf, 2325 label); 2326} 2327 2328void 2329mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet, 2330 struct mbuf *newmbuf) 2331{ 2332 struct label *oldmbuflabel, *newmbuflabel; 2333 2334 oldmbuflabel = mbuf_to_label(oldmbuf); 2335 newmbuflabel = mbuf_to_label(newmbuf); 2336 2337 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, oldmbuflabel, 2338 ifnet, &ifnet->if_label, newmbuf, newmbuflabel); 2339} 2340 2341void 2342mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2343{ 2344 struct label *oldmbuflabel, *newmbuflabel; 2345 2346 oldmbuflabel = mbuf_to_label(oldmbuf); 2347 newmbuflabel = mbuf_to_label(newmbuf); 2348 2349 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, oldmbuflabel, newmbuf, 2350 newmbuflabel); 2351} 2352 2353int 2354mac_fragment_match(struct mbuf *fragment, struct ipq *ipq) 2355{ 2356 struct label *label; 2357 int result; 2358 2359 label = mbuf_to_label(fragment); 2360 2361 result = 1; 2362 MAC_BOOLEAN(fragment_match, &&, fragment, label, ipq, 2363 &ipq->ipq_label); 2364 2365 return (result); 2366} 2367 2368void 2369mac_update_ipq(struct mbuf *fragment, struct ipq *ipq) 2370{ 2371 struct label *label; 2372 2373 label = mbuf_to_label(fragment); 2374 2375 MAC_PERFORM(update_ipq, fragment, label, ipq, &ipq->ipq_label); 2376} 2377 2378void 2379mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) 2380{ 2381 struct label *label; 2382 2383 label = mbuf_to_label(mbuf); 2384 2385 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf, 2386 label); 2387} 2388 2389void 2390mac_create_mount(struct ucred *cred, struct mount *mp) 2391{ 2392 2393 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, 2394 &mp->mnt_fslabel); 2395} 2396 2397void 2398mac_create_root_mount(struct ucred *cred, struct mount *mp) 2399{ 2400 2401 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, 2402 &mp->mnt_fslabel); 2403} 2404 2405int 2406mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) 2407{ 2408 int error; 2409 2410 if (!mac_enforce_network) 2411 return (0); 2412 2413 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet, 2414 &ifnet->if_label); 2415 2416 return (error); 2417} 2418 2419static int 2420mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) 2421{ 2422 int error; 2423 2424 MAC_CHECK(check_cred_relabel, cred, newlabel); 2425 2426 return (error); 2427} 2428 2429int 2430mac_check_cred_visible(struct ucred *u1, struct ucred *u2) 2431{ 2432 int error; 2433 2434 if (!mac_enforce_process) 2435 return (0); 2436 2437 MAC_CHECK(check_cred_visible, u1, u2); 2438 2439 return (error); 2440} 2441 2442int 2443mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) 2444{ 2445 struct label *label; 2446 int error; 2447 2448 M_ASSERTPKTHDR(mbuf); 2449 2450 if (!mac_enforce_network) 2451 return (0); 2452 2453 label = mbuf_to_label(mbuf); 2454 2455 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf, 2456 label); 2457 2458 return (error); 2459} 2460 2461int 2462mac_check_kenv_dump(struct ucred *cred) 2463{ 2464 int error; 2465 2466 if (!mac_enforce_system) 2467 return (0); 2468 2469 MAC_CHECK(check_kenv_dump, cred); 2470 2471 return (error); 2472} 2473 2474int 2475mac_check_kenv_get(struct ucred *cred, char *name) 2476{ 2477 int error; 2478 2479 if (!mac_enforce_system) 2480 return (0); 2481 2482 MAC_CHECK(check_kenv_get, cred, name); 2483 2484 return (error); 2485} 2486 2487int 2488mac_check_kenv_set(struct ucred *cred, char *name, char *value) 2489{ 2490 int error; 2491 2492 if (!mac_enforce_system) 2493 return (0); 2494 2495 MAC_CHECK(check_kenv_set, cred, name, value); 2496 2497 return (error); 2498} 2499 2500int 2501mac_check_kenv_unset(struct ucred *cred, char *name) 2502{ 2503 int error; 2504 2505 if (!mac_enforce_system) 2506 return (0); 2507 2508 MAC_CHECK(check_kenv_unset, cred, name); 2509 2510 return (error); 2511} 2512 2513int 2514mac_check_kld_load(struct ucred *cred, struct vnode *vp) 2515{ 2516 int error; 2517 2518 ASSERT_VOP_LOCKED(vp, "mac_check_kld_load"); 2519 2520 if (!mac_enforce_kld) 2521 return (0); 2522 2523 MAC_CHECK(check_kld_load, cred, vp, &vp->v_label); 2524 2525 return (error); 2526} 2527 2528int 2529mac_check_kld_stat(struct ucred *cred) 2530{ 2531 int error; 2532 2533 if (!mac_enforce_kld) 2534 return (0); 2535 2536 MAC_CHECK(check_kld_stat, cred); 2537 2538 return (error); 2539} 2540 2541int 2542mac_check_kld_unload(struct ucred *cred) 2543{ 2544 int error; 2545 2546 if (!mac_enforce_kld) 2547 return (0); 2548 2549 MAC_CHECK(check_kld_unload, cred); 2550 2551 return (error); 2552} 2553 2554int 2555mac_check_mount_stat(struct ucred *cred, struct mount *mount) 2556{ 2557 int error; 2558 2559 if (!mac_enforce_fs) 2560 return (0); 2561 2562 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); 2563 2564 return (error); 2565} 2566 2567int 2568mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, 2569 void *data) 2570{ 2571 int error; 2572 2573 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2574 2575 if (!mac_enforce_pipe) 2576 return (0); 2577 2578 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); 2579 2580 return (error); 2581} 2582 2583int 2584mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) 2585{ 2586 int error; 2587 2588 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2589 2590 if (!mac_enforce_pipe) 2591 return (0); 2592 2593 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); 2594 2595 return (error); 2596} 2597 2598int 2599mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) 2600{ 2601 int error; 2602 2603 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2604 2605 if (!mac_enforce_pipe) 2606 return (0); 2607 2608 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); 2609 2610 return (error); 2611} 2612 2613static int 2614mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 2615 struct label *newlabel) 2616{ 2617 int error; 2618 2619 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2620 2621 if (!mac_enforce_pipe) 2622 return (0); 2623 2624 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); 2625 2626 return (error); 2627} 2628 2629int 2630mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) 2631{ 2632 int error; 2633 2634 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2635 2636 if (!mac_enforce_pipe) 2637 return (0); 2638 2639 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); 2640 2641 return (error); 2642} 2643 2644int 2645mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) 2646{ 2647 int error; 2648 2649 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2650 2651 if (!mac_enforce_pipe) 2652 return (0); 2653 2654 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); 2655 2656 return (error); 2657} 2658 2659int 2660mac_check_proc_debug(struct ucred *cred, struct proc *proc) 2661{ 2662 int error; 2663 2664 PROC_LOCK_ASSERT(proc, MA_OWNED); 2665 2666 if (!mac_enforce_process) 2667 return (0); 2668 2669 MAC_CHECK(check_proc_debug, cred, proc); 2670 2671 return (error); 2672} 2673 2674int 2675mac_check_proc_sched(struct ucred *cred, struct proc *proc) 2676{ 2677 int error; 2678 2679 PROC_LOCK_ASSERT(proc, MA_OWNED); 2680 2681 if (!mac_enforce_process) 2682 return (0); 2683 2684 MAC_CHECK(check_proc_sched, cred, proc); 2685 2686 return (error); 2687} 2688 2689int 2690mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 2691{ 2692 int error; 2693 2694 PROC_LOCK_ASSERT(proc, MA_OWNED); 2695 2696 if (!mac_enforce_process) 2697 return (0); 2698 2699 MAC_CHECK(check_proc_signal, cred, proc, signum); 2700 2701 return (error); 2702} 2703 2704int 2705mac_check_socket_bind(struct ucred *ucred, struct socket *socket, 2706 struct sockaddr *sockaddr) 2707{ 2708 int error; 2709 2710 if (!mac_enforce_socket) 2711 return (0); 2712 2713 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label, 2714 sockaddr); 2715 2716 return (error); 2717} 2718 2719int 2720mac_check_socket_connect(struct ucred *cred, struct socket *socket, 2721 struct sockaddr *sockaddr) 2722{ 2723 int error; 2724 2725 if (!mac_enforce_socket) 2726 return (0); 2727 2728 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label, 2729 sockaddr); 2730 2731 return (error); 2732} 2733 2734int 2735mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf) 2736{ 2737 struct label *label; 2738 int error; 2739 2740 if (!mac_enforce_socket) 2741 return (0); 2742 2743 label = mbuf_to_label(mbuf); 2744 2745 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf, 2746 label); 2747 2748 return (error); 2749} 2750 2751int 2752mac_check_socket_listen(struct ucred *cred, struct socket *socket) 2753{ 2754 int error; 2755 2756 if (!mac_enforce_socket) 2757 return (0); 2758 2759 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label); 2760 return (error); 2761} 2762 2763int 2764mac_check_socket_receive(struct ucred *cred, struct socket *so) 2765{ 2766 int error; 2767 2768 if (!mac_enforce_socket) 2769 return (0); 2770 2771 MAC_CHECK(check_socket_receive, cred, so, &so->so_label); 2772 2773 return (error); 2774} 2775 2776static int 2777mac_check_socket_relabel(struct ucred *cred, struct socket *socket, 2778 struct label *newlabel) 2779{ 2780 int error; 2781 2782 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label, 2783 newlabel); 2784 2785 return (error); 2786} 2787 2788int 2789mac_check_socket_send(struct ucred *cred, struct socket *so) 2790{ 2791 int error; 2792 2793 if (!mac_enforce_socket) 2794 return (0); 2795 2796 MAC_CHECK(check_socket_send, cred, so, &so->so_label); 2797 2798 return (error); 2799} 2800 2801int 2802mac_check_socket_visible(struct ucred *cred, struct socket *socket) 2803{ 2804 int error; 2805 2806 if (!mac_enforce_socket) 2807 return (0); 2808 2809 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label); 2810 2811 return (error); 2812} 2813 2814int 2815mac_check_sysarch_ioperm(struct ucred *cred) 2816{ 2817 int error; 2818 2819 if (!mac_enforce_system) 2820 return (0); 2821 2822 MAC_CHECK(check_sysarch_ioperm, cred); 2823 return (error); 2824} 2825 2826int 2827mac_check_system_acct(struct ucred *cred, struct vnode *vp) 2828{ 2829 int error; 2830 2831 if (vp != NULL) { 2832 ASSERT_VOP_LOCKED(vp, "mac_check_system_acct"); 2833 } 2834 2835 if (!mac_enforce_system) 2836 return (0); 2837 2838 MAC_CHECK(check_system_acct, cred, vp, 2839 vp != NULL ? &vp->v_label : NULL); 2840 2841 return (error); 2842} 2843 2844int 2845mac_check_system_nfsd(struct ucred *cred) 2846{ 2847 int error; 2848 2849 if (!mac_enforce_system) 2850 return (0); 2851 2852 MAC_CHECK(check_system_nfsd, cred); 2853 2854 return (error); 2855} 2856 2857int 2858mac_check_system_reboot(struct ucred *cred, int howto) 2859{ 2860 int error; 2861 2862 if (!mac_enforce_system) 2863 return (0); 2864 2865 MAC_CHECK(check_system_reboot, cred, howto); 2866 2867 return (error); 2868} 2869 2870int 2871mac_check_system_settime(struct ucred *cred) 2872{ 2873 int error; 2874 2875 if (!mac_enforce_system) 2876 return (0); 2877 2878 MAC_CHECK(check_system_settime, cred); 2879 2880 return (error); 2881} 2882 2883int 2884mac_check_system_swapon(struct ucred *cred, struct vnode *vp) 2885{ 2886 int error; 2887 2888 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon"); 2889 2890 if (!mac_enforce_system) 2891 return (0); 2892 2893 MAC_CHECK(check_system_swapon, cred, vp, &vp->v_label); 2894 return (error); 2895} 2896 2897int 2898mac_check_system_swapoff(struct ucred *cred, struct vnode *vp) 2899{ 2900 int error; 2901 2902 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapoff"); 2903 2904 if (!mac_enforce_system) 2905 return (0); 2906 2907 MAC_CHECK(check_system_swapoff, cred, vp, &vp->v_label); 2908 return (error); 2909} 2910 2911int 2912mac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen, 2913 void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen) 2914{ 2915 int error; 2916 2917 /* 2918 * XXXMAC: We're very much like to assert the SYSCTL_LOCK here, 2919 * but since it's not exported from kern_sysctl.c, we can't. 2920 */ 2921 if (!mac_enforce_system) 2922 return (0); 2923 2924 MAC_CHECK(check_system_sysctl, cred, name, namelen, old, oldlenp, 2925 inkernel, new, newlen); 2926 2927 return (error); 2928} 2929 2930int 2931mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 2932 struct ifnet *ifnet) 2933{ 2934 char *elements, *buffer; 2935 struct mac mac; 2936 int error; 2937 2938 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 2939 if (error) 2940 return (error); 2941 2942 error = mac_check_structmac_consistent(&mac); 2943 if (error) 2944 return (error); 2945 2946 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2947 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 2948 if (error) { 2949 free(elements, M_MACTEMP); 2950 return (error); 2951 } 2952 2953 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 2954 error = mac_externalize_ifnet_label(&ifnet->if_label, elements, 2955 buffer, mac.m_buflen, M_WAITOK); 2956 if (error == 0) 2957 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 2958 2959 free(buffer, M_MACTEMP); 2960 free(elements, M_MACTEMP); 2961 2962 return (error); 2963} 2964 2965int 2966mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 2967 struct ifnet *ifnet) 2968{ 2969 struct label intlabel; 2970 struct mac mac; 2971 char *buffer; 2972 int error; 2973 2974 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 2975 if (error) 2976 return (error); 2977 2978 error = mac_check_structmac_consistent(&mac); 2979 if (error) 2980 return (error); 2981 2982 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2983 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 2984 if (error) { 2985 free(buffer, M_MACTEMP); 2986 return (error); 2987 } 2988 2989 mac_init_ifnet_label(&intlabel); 2990 error = mac_internalize_ifnet_label(&intlabel, buffer); 2991 free(buffer, M_MACTEMP); 2992 if (error) { 2993 mac_destroy_ifnet_label(&intlabel); 2994 return (error); 2995 } 2996 2997 /* 2998 * XXX: Note that this is a redundant privilege check, since 2999 * policies impose this check themselves if required by the 3000 * policy. Eventually, this should go away. 3001 */ 3002 error = suser_cred(cred, 0); 3003 if (error) { 3004 mac_destroy_ifnet_label(&intlabel); 3005 return (error); 3006 } 3007 3008 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label, 3009 &intlabel); 3010 if (error) { 3011 mac_destroy_ifnet_label(&intlabel); 3012 return (error); 3013 } 3014 3015 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel); 3016 3017 mac_destroy_ifnet_label(&intlabel); 3018 return (0); 3019} 3020 3021void 3022mac_create_devfs_device(struct mount *mp, dev_t dev, struct devfs_dirent *de) 3023{ 3024 3025 MAC_PERFORM(create_devfs_device, mp, dev, de, &de->de_label); 3026} 3027 3028void 3029mac_create_devfs_symlink(struct ucred *cred, struct mount *mp, 3030 struct devfs_dirent *dd, struct devfs_dirent *de) 3031{ 3032 3033 MAC_PERFORM(create_devfs_symlink, cred, mp, dd, &dd->de_label, de, 3034 &de->de_label); 3035} 3036 3037void 3038mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen, 3039 struct devfs_dirent *de) 3040{ 3041 3042 MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de, 3043 &de->de_label); 3044} 3045 3046int 3047mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 3048 struct mac *mac) 3049{ 3050 struct label intlabel; 3051 char *buffer; 3052 int error; 3053 3054 error = mac_check_structmac_consistent(mac); 3055 if (error) 3056 return (error); 3057 3058 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3059 error = copyinstr(mac->m_string, buffer, mac->m_buflen, NULL); 3060 if (error) { 3061 free(buffer, M_MACTEMP); 3062 return (error); 3063 } 3064 3065 mac_init_socket_label(&intlabel, M_WAITOK); 3066 error = mac_internalize_socket_label(&intlabel, buffer); 3067 free(buffer, M_MACTEMP); 3068 if (error) { 3069 mac_destroy_socket_label(&intlabel); 3070 return (error); 3071 } 3072 3073 mac_check_socket_relabel(cred, so, &intlabel); 3074 if (error) { 3075 mac_destroy_socket_label(&intlabel); 3076 return (error); 3077 } 3078 3079 mac_relabel_socket(cred, so, &intlabel); 3080 3081 mac_destroy_socket_label(&intlabel); 3082 return (0); 3083} 3084 3085int 3086mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) 3087{ 3088 int error; 3089 3090 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 3091 3092 error = mac_check_pipe_relabel(cred, pipe, label); 3093 if (error) 3094 return (error); 3095 3096 mac_relabel_pipe(cred, pipe, label); 3097 3098 return (0); 3099} 3100 3101int 3102mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 3103 struct mac *mac) 3104{ 3105 char *buffer, *elements; 3106 int error; 3107 3108 error = mac_check_structmac_consistent(mac); 3109 if (error) 3110 return (error); 3111 3112 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3113 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 3114 if (error) { 3115 free(elements, M_MACTEMP); 3116 return (error); 3117 } 3118 3119 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3120 error = mac_externalize_socket_label(&so->so_label, elements, 3121 buffer, mac->m_buflen, M_WAITOK); 3122 if (error == 0) 3123 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 3124 3125 free(buffer, M_MACTEMP); 3126 free(elements, M_MACTEMP); 3127 3128 return (error); 3129} 3130 3131int 3132mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 3133 struct mac *mac) 3134{ 3135 char *elements, *buffer; 3136 int error; 3137 3138 error = mac_check_structmac_consistent(mac); 3139 if (error) 3140 return (error); 3141 3142 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3143 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 3144 if (error) { 3145 free(elements, M_MACTEMP); 3146 return (error); 3147 } 3148 3149 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3150 error = mac_externalize_socket_peer_label(&so->so_peerlabel, 3151 elements, buffer, mac->m_buflen, M_WAITOK); 3152 if (error == 0) 3153 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 3154 3155 free(buffer, M_MACTEMP); 3156 free(elements, M_MACTEMP); 3157 3158 return (error); 3159} 3160 3161/* 3162 * Implementation of VOP_SETLABEL() that relies on extended attributes 3163 * to store label data. Can be referenced by filesystems supporting 3164 * extended attributes. 3165 */ 3166int 3167vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 3168{ 3169 struct vnode *vp = ap->a_vp; 3170 struct label *intlabel = ap->a_label; 3171 int error; 3172 3173 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 3174 3175 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3176 return (EOPNOTSUPP); 3177 3178 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); 3179 if (error) 3180 return (error); 3181 3182 mac_relabel_vnode(ap->a_cred, vp, intlabel); 3183 3184 return (0); 3185} 3186 3187static int 3188vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 3189{ 3190 int error; 3191 3192 if (vp->v_mount == NULL) { 3193 /* printf("vn_setlabel: null v_mount\n"); */ 3194 if (vp->v_type != VNON) 3195 printf("vn_setlabel: null v_mount with non-VNON\n"); 3196 return (EBADF); 3197 } 3198 3199 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3200 return (EOPNOTSUPP); 3201 3202 /* 3203 * Multi-phase commit. First check the policies to confirm the 3204 * change is OK. Then commit via the filesystem. Finally, 3205 * update the actual vnode label. Question: maybe the filesystem 3206 * should update the vnode at the end as part of VOP_SETLABEL()? 3207 */ 3208 error = mac_check_vnode_relabel(cred, vp, intlabel); 3209 if (error) 3210 return (error); 3211 3212 /* 3213 * VADMIN provides the opportunity for the filesystem to make 3214 * decisions about who is and is not able to modify labels 3215 * and protections on files. This might not be right. We can't 3216 * assume VOP_SETLABEL() will do it, because we might implement 3217 * that as part of vop_stdsetlabel_ea(). 3218 */ 3219 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 3220 if (error) 3221 return (error); 3222 3223 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 3224 if (error) 3225 return (error); 3226 3227 return (0); 3228} 3229 3230int 3231__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3232{ 3233 char *elements, *buffer; 3234 struct mac mac; 3235 struct proc *tproc; 3236 struct ucred *tcred; 3237 int error; 3238 3239 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3240 if (error) 3241 return (error); 3242 3243 error = mac_check_structmac_consistent(&mac); 3244 if (error) 3245 return (error); 3246 3247 tproc = pfind(uap->pid); 3248 if (tproc == NULL) 3249 return (ESRCH); 3250 3251 tcred = NULL; /* Satisfy gcc. */ 3252 error = p_cansee(td, tproc); 3253 if (error == 0) 3254 tcred = crhold(tproc->p_ucred); 3255 PROC_UNLOCK(tproc); 3256 if (error) 3257 return (error); 3258 3259 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3260 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3261 if (error) { 3262 free(elements, M_MACTEMP); 3263 crfree(tcred); 3264 return (error); 3265 } 3266 3267 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3268 error = mac_externalize_cred_label(&tcred->cr_label, elements, 3269 buffer, mac.m_buflen, M_WAITOK); 3270 if (error == 0) 3271 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3272 3273 free(buffer, M_MACTEMP); 3274 free(elements, M_MACTEMP); 3275 crfree(tcred); 3276 return (error); 3277} 3278 3279/* 3280 * MPSAFE 3281 */ 3282int 3283__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3284{ 3285 char *elements, *buffer; 3286 struct mac mac; 3287 int error; 3288 3289 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3290 if (error) 3291 return (error); 3292 3293 error = mac_check_structmac_consistent(&mac); 3294 if (error) 3295 return (error); 3296 3297 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3298 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3299 if (error) { 3300 free(elements, M_MACTEMP); 3301 return (error); 3302 } 3303 3304 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3305 error = mac_externalize_cred_label(&td->td_ucred->cr_label, 3306 elements, buffer, mac.m_buflen, M_WAITOK); 3307 if (error == 0) 3308 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3309 3310 free(buffer, M_MACTEMP); 3311 free(elements, M_MACTEMP); 3312 return (error); 3313} 3314 3315/* 3316 * MPSAFE 3317 */ 3318int 3319__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3320{ 3321 struct ucred *newcred, *oldcred; 3322 struct label intlabel; 3323 struct proc *p; 3324 struct mac mac; 3325 char *buffer; 3326 int error; 3327 3328 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3329 if (error) 3330 return (error); 3331 3332 error = mac_check_structmac_consistent(&mac); 3333 if (error) 3334 return (error); 3335 3336 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3337 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3338 if (error) { 3339 free(buffer, M_MACTEMP); 3340 return (error); 3341 } 3342 3343 mac_init_cred_label(&intlabel); 3344 error = mac_internalize_cred_label(&intlabel, buffer); 3345 free(buffer, M_MACTEMP); 3346 if (error) { 3347 mac_destroy_cred_label(&intlabel); 3348 return (error); 3349 } 3350 3351 newcred = crget(); 3352 3353 p = td->td_proc; 3354 PROC_LOCK(p); 3355 oldcred = p->p_ucred; 3356 3357 error = mac_check_cred_relabel(oldcred, &intlabel); 3358 if (error) { 3359 PROC_UNLOCK(p); 3360 crfree(newcred); 3361 goto out; 3362 } 3363 3364 setsugid(p); 3365 crcopy(newcred, oldcred); 3366 mac_relabel_cred(newcred, &intlabel); 3367 p->p_ucred = newcred; 3368 3369 /* 3370 * Grab additional reference for use while revoking mmaps, prior 3371 * to releasing the proc lock and sharing the cred. 3372 */ 3373 crhold(newcred); 3374 PROC_UNLOCK(p); 3375 3376 if (mac_enforce_vm) { 3377 mtx_lock(&Giant); 3378 mac_cred_mmapped_drop_perms(td, newcred); 3379 mtx_unlock(&Giant); 3380 } 3381 3382 crfree(newcred); /* Free revocation reference. */ 3383 crfree(oldcred); 3384 3385out: 3386 mac_destroy_cred_label(&intlabel); 3387 return (error); 3388} 3389 3390/* 3391 * MPSAFE 3392 */ 3393int 3394__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3395{ 3396 char *elements, *buffer; 3397 struct label intlabel; 3398 struct file *fp; 3399 struct mac mac; 3400 struct vnode *vp; 3401 struct pipe *pipe; 3402 short label_type; 3403 int error; 3404 3405 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3406 if (error) 3407 return (error); 3408 3409 error = mac_check_structmac_consistent(&mac); 3410 if (error) 3411 return (error); 3412 3413 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3414 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3415 if (error) { 3416 free(elements, M_MACTEMP); 3417 return (error); 3418 } 3419 3420 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3421 mtx_lock(&Giant); /* VFS */ 3422 error = fget(td, uap->fd, &fp); 3423 if (error) 3424 goto out; 3425 3426 label_type = fp->f_type; 3427 switch (fp->f_type) { 3428 case DTYPE_FIFO: 3429 case DTYPE_VNODE: 3430 vp = fp->f_vnode; 3431 3432 mac_init_vnode_label(&intlabel); 3433 3434 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3435 mac_copy_vnode_label(&vp->v_label, &intlabel); 3436 VOP_UNLOCK(vp, 0, td); 3437 3438 break; 3439 case DTYPE_PIPE: 3440 pipe = fp->f_data; 3441 3442 mac_init_pipe_label(&intlabel); 3443 3444 PIPE_LOCK(pipe); 3445 mac_copy_pipe_label(pipe->pipe_label, &intlabel); 3446 PIPE_UNLOCK(pipe); 3447 break; 3448 default: 3449 error = EINVAL; 3450 fdrop(fp, td); 3451 goto out; 3452 } 3453 fdrop(fp, td); 3454 3455 switch (label_type) { 3456 case DTYPE_FIFO: 3457 case DTYPE_VNODE: 3458 if (error == 0) 3459 error = mac_externalize_vnode_label(&intlabel, 3460 elements, buffer, mac.m_buflen, M_WAITOK); 3461 mac_destroy_vnode_label(&intlabel); 3462 break; 3463 case DTYPE_PIPE: 3464 error = mac_externalize_pipe_label(&intlabel, elements, 3465 buffer, mac.m_buflen, M_WAITOK); 3466 mac_destroy_pipe_label(&intlabel); 3467 break; 3468 default: 3469 panic("__mac_get_fd: corrupted label_type"); 3470 } 3471 3472 if (error == 0) 3473 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3474 3475out: 3476 mtx_unlock(&Giant); /* VFS */ 3477 free(buffer, M_MACTEMP); 3478 free(elements, M_MACTEMP); 3479 3480 return (error); 3481} 3482 3483/* 3484 * MPSAFE 3485 */ 3486int 3487__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3488{ 3489 char *elements, *buffer; 3490 struct nameidata nd; 3491 struct label intlabel; 3492 struct mac mac; 3493 int error; 3494 3495 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3496 if (error) 3497 return (error); 3498 3499 error = mac_check_structmac_consistent(&mac); 3500 if (error) 3501 return (error); 3502 3503 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3504 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3505 if (error) { 3506 free(elements, M_MACTEMP); 3507 return (error); 3508 } 3509 3510 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3511 mtx_lock(&Giant); /* VFS */ 3512 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3513 td); 3514 error = namei(&nd); 3515 if (error) 3516 goto out; 3517 3518 mac_init_vnode_label(&intlabel); 3519 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3520 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3521 mac.m_buflen, M_WAITOK); 3522 3523 NDFREE(&nd, 0); 3524 mac_destroy_vnode_label(&intlabel); 3525 3526 if (error == 0) 3527 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3528 3529out: 3530 mtx_unlock(&Giant); /* VFS */ 3531 3532 free(buffer, M_MACTEMP); 3533 free(elements, M_MACTEMP); 3534 3535 return (error); 3536} 3537 3538/* 3539 * MPSAFE 3540 */ 3541int 3542__mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3543{ 3544 char *elements, *buffer; 3545 struct nameidata nd; 3546 struct label intlabel; 3547 struct mac mac; 3548 int error; 3549 3550 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3551 if (error) 3552 return (error); 3553 3554 error = mac_check_structmac_consistent(&mac); 3555 if (error) 3556 return (error); 3557 3558 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3559 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3560 if (error) { 3561 free(elements, M_MACTEMP); 3562 return (error); 3563 } 3564 3565 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3566 mtx_lock(&Giant); /* VFS */ 3567 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3568 td); 3569 error = namei(&nd); 3570 if (error) 3571 goto out; 3572 3573 mac_init_vnode_label(&intlabel); 3574 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3575 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3576 mac.m_buflen, M_WAITOK); 3577 NDFREE(&nd, 0); 3578 mac_destroy_vnode_label(&intlabel); 3579 3580 if (error == 0) 3581 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3582 3583out: 3584 mtx_unlock(&Giant); /* VFS */ 3585 3586 free(buffer, M_MACTEMP); 3587 free(elements, M_MACTEMP); 3588 3589 return (error); 3590} 3591 3592/* 3593 * MPSAFE 3594 */ 3595int 3596__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3597{ 3598 struct label intlabel; 3599 struct pipe *pipe; 3600 struct file *fp; 3601 struct mount *mp; 3602 struct vnode *vp; 3603 struct mac mac; 3604 char *buffer; 3605 int error; 3606 3607 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3608 if (error) 3609 return (error); 3610 3611 error = mac_check_structmac_consistent(&mac); 3612 if (error) 3613 return (error); 3614 3615 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3616 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3617 if (error) { 3618 free(buffer, M_MACTEMP); 3619 return (error); 3620 } 3621 3622 mtx_lock(&Giant); /* VFS */ 3623 3624 error = fget(td, uap->fd, &fp); 3625 if (error) 3626 goto out; 3627 3628 switch (fp->f_type) { 3629 case DTYPE_FIFO: 3630 case DTYPE_VNODE: 3631 mac_init_vnode_label(&intlabel); 3632 error = mac_internalize_vnode_label(&intlabel, buffer); 3633 if (error) { 3634 mac_destroy_vnode_label(&intlabel); 3635 break; 3636 } 3637 3638 vp = fp->f_vnode; 3639 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3640 if (error != 0) { 3641 mac_destroy_vnode_label(&intlabel); 3642 break; 3643 } 3644 3645 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3646 error = vn_setlabel(vp, &intlabel, td->td_ucred); 3647 VOP_UNLOCK(vp, 0, td); 3648 vn_finished_write(mp); 3649 3650 mac_destroy_vnode_label(&intlabel); 3651 break; 3652 3653 case DTYPE_PIPE: 3654 mac_init_pipe_label(&intlabel); 3655 error = mac_internalize_pipe_label(&intlabel, buffer); 3656 if (error == 0) { 3657 pipe = fp->f_data; 3658 PIPE_LOCK(pipe); 3659 error = mac_pipe_label_set(td->td_ucred, pipe, 3660 &intlabel); 3661 PIPE_UNLOCK(pipe); 3662 } 3663 3664 mac_destroy_pipe_label(&intlabel); 3665 break; 3666 3667 default: 3668 error = EINVAL; 3669 } 3670 3671 fdrop(fp, td); 3672out: 3673 mtx_unlock(&Giant); /* VFS */ 3674 3675 free(buffer, M_MACTEMP); 3676 3677 return (error); 3678} 3679 3680/* 3681 * MPSAFE 3682 */ 3683int 3684__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3685{ 3686 struct label intlabel; 3687 struct nameidata nd; 3688 struct mount *mp; 3689 struct mac mac; 3690 char *buffer; 3691 int error; 3692 3693 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3694 if (error) 3695 return (error); 3696 3697 error = mac_check_structmac_consistent(&mac); 3698 if (error) 3699 return (error); 3700 3701 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3702 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3703 if (error) { 3704 free(buffer, M_MACTEMP); 3705 return (error); 3706 } 3707 3708 mac_init_vnode_label(&intlabel); 3709 error = mac_internalize_vnode_label(&intlabel, buffer); 3710 free(buffer, M_MACTEMP); 3711 if (error) { 3712 mac_destroy_vnode_label(&intlabel); 3713 return (error); 3714 } 3715 3716 mtx_lock(&Giant); /* VFS */ 3717 3718 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3719 td); 3720 error = namei(&nd); 3721 if (error == 0) { 3722 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3723 if (error == 0) 3724 error = vn_setlabel(nd.ni_vp, &intlabel, 3725 td->td_ucred); 3726 vn_finished_write(mp); 3727 } 3728 3729 NDFREE(&nd, 0); 3730 mtx_unlock(&Giant); /* VFS */ 3731 mac_destroy_vnode_label(&intlabel); 3732 3733 return (error); 3734} 3735 3736/* 3737 * MPSAFE 3738 */ 3739int 3740__mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3741{ 3742 struct label intlabel; 3743 struct nameidata nd; 3744 struct mount *mp; 3745 struct mac mac; 3746 char *buffer; 3747 int error; 3748 3749 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3750 if (error) 3751 return (error); 3752 3753 error = mac_check_structmac_consistent(&mac); 3754 if (error) 3755 return (error); 3756 3757 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3758 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3759 if (error) { 3760 free(buffer, M_MACTEMP); 3761 return (error); 3762 } 3763 3764 mac_init_vnode_label(&intlabel); 3765 error = mac_internalize_vnode_label(&intlabel, buffer); 3766 free(buffer, M_MACTEMP); 3767 if (error) { 3768 mac_destroy_vnode_label(&intlabel); 3769 return (error); 3770 } 3771 3772 mtx_lock(&Giant); /* VFS */ 3773 3774 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3775 td); 3776 error = namei(&nd); 3777 if (error == 0) { 3778 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3779 if (error == 0) 3780 error = vn_setlabel(nd.ni_vp, &intlabel, 3781 td->td_ucred); 3782 vn_finished_write(mp); 3783 } 3784 3785 NDFREE(&nd, 0); 3786 mtx_unlock(&Giant); /* VFS */ 3787 mac_destroy_vnode_label(&intlabel); 3788 3789 return (error); 3790} 3791 3792/* 3793 * MPSAFE 3794 */ 3795int 3796mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3797{ 3798 struct mac_policy_conf *mpc; 3799 char target[MAC_MAX_POLICY_NAME]; 3800 int entrycount, error; 3801 3802 error = copyinstr(uap->policy, target, sizeof(target), NULL); 3803 if (error) 3804 return (error); 3805 3806 error = ENOSYS; 3807 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3808 if (strcmp(mpc->mpc_name, target) == 0 && 3809 mpc->mpc_ops->mpo_syscall != NULL) { 3810 error = mpc->mpc_ops->mpo_syscall(td, 3811 uap->call, uap->arg); 3812 goto out; 3813 } 3814 } 3815 3816 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { 3817 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3818 if (strcmp(mpc->mpc_name, target) == 0 && 3819 mpc->mpc_ops->mpo_syscall != NULL) { 3820 error = mpc->mpc_ops->mpo_syscall(td, 3821 uap->call, uap->arg); 3822 break; 3823 } 3824 } 3825 mac_policy_list_unbusy(); 3826 } 3827out: 3828 return (error); 3829} 3830 3831SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); 3832SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); 3833 3834#else /* !MAC */ 3835 3836int 3837__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3838{ 3839 3840 return (ENOSYS); 3841} 3842 3843int 3844__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3845{ 3846 3847 return (ENOSYS); 3848} 3849 3850int 3851__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3852{ 3853 3854 return (ENOSYS); 3855} 3856 3857int 3858__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3859{ 3860 3861 return (ENOSYS); 3862} 3863 3864int 3865__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3866{ 3867 3868 return (ENOSYS); 3869} 3870 3871int 3872__mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3873{ 3874 3875 return (ENOSYS); 3876} 3877 3878int 3879__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3880{ 3881 3882 return (ENOSYS); 3883} 3884 3885int 3886__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3887{ 3888 3889 return (ENOSYS); 3890} 3891 3892int 3893__mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3894{ 3895 3896 return (ENOSYS); 3897} 3898 3899int 3900mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3901{ 3902 3903 return (ENOSYS); 3904} 3905 3906#endif 3907