mac_syscalls.c revision 119198
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_syscalls.c 119198 2003-08-21 13:53:01Z 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_deleteextattr(struct ucred *cred, struct vnode *vp, 1618 int attrnamespace, const char *name) 1619{ 1620 int error; 1621 1622 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr"); 1623 1624 if (!mac_enforce_fs) 1625 return (0); 1626 1627 MAC_CHECK(check_vnode_deleteextattr, cred, vp, &vp->v_label, 1628 attrnamespace, name); 1629 return (error); 1630} 1631 1632int 1633mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 1634 struct image_params *imgp) 1635{ 1636 int error; 1637 1638 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 1639 1640 if (!mac_enforce_process && !mac_enforce_fs) 1641 return (0); 1642 1643 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label, imgp, 1644 imgp->execlabel); 1645 1646 return (error); 1647} 1648 1649int 1650mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 1651{ 1652 int error; 1653 1654 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 1655 1656 if (!mac_enforce_fs) 1657 return (0); 1658 1659 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); 1660 return (error); 1661} 1662 1663int 1664mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1665 int attrnamespace, const char *name, struct uio *uio) 1666{ 1667 int error; 1668 1669 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 1670 1671 if (!mac_enforce_fs) 1672 return (0); 1673 1674 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, 1675 attrnamespace, name, uio); 1676 return (error); 1677} 1678 1679int 1680mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 1681 struct vnode *vp, struct componentname *cnp) 1682{ 1683 int error; 1684 1685 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 1686 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 1687 1688 if (!mac_enforce_fs) 1689 return (0); 1690 1691 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp, 1692 &vp->v_label, cnp); 1693 return (error); 1694} 1695 1696int 1697mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp, 1698 int attrnamespace) 1699{ 1700 int error; 1701 1702 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr"); 1703 1704 if (!mac_enforce_fs) 1705 return (0); 1706 1707 MAC_CHECK(check_vnode_listextattr, cred, vp, &vp->v_label, 1708 attrnamespace); 1709 return (error); 1710} 1711 1712int 1713mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 1714 struct componentname *cnp) 1715{ 1716 int error; 1717 1718 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 1719 1720 if (!mac_enforce_fs) 1721 return (0); 1722 1723 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); 1724 return (error); 1725} 1726 1727int 1728mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot) 1729{ 1730 int error; 1731 1732 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 1733 1734 if (!mac_enforce_fs || !mac_enforce_vm) 1735 return (0); 1736 1737 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot); 1738 return (error); 1739} 1740 1741void 1742mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 1743{ 1744 int result = *prot; 1745 1746 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 1747 1748 if (!mac_enforce_fs || !mac_enforce_vm) 1749 return; 1750 1751 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label, 1752 &result); 1753 1754 *prot = result; 1755} 1756 1757int 1758mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 1759{ 1760 int error; 1761 1762 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 1763 1764 if (!mac_enforce_fs || !mac_enforce_vm) 1765 return (0); 1766 1767 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot); 1768 return (error); 1769} 1770 1771int 1772mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 1773{ 1774 int error; 1775 1776 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 1777 1778 if (!mac_enforce_fs) 1779 return (0); 1780 1781 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); 1782 return (error); 1783} 1784 1785int 1786mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 1787 struct vnode *vp) 1788{ 1789 int error; 1790 1791 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 1792 1793 if (!mac_enforce_fs) 1794 return (0); 1795 1796 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 1797 &vp->v_label); 1798 1799 return (error); 1800} 1801 1802int 1803mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 1804 struct vnode *vp) 1805{ 1806 int error; 1807 1808 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 1809 1810 if (!mac_enforce_fs) 1811 return (0); 1812 1813 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 1814 &vp->v_label); 1815 1816 return (error); 1817} 1818 1819int 1820mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 1821{ 1822 int error; 1823 1824 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 1825 1826 if (!mac_enforce_fs) 1827 return (0); 1828 1829 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); 1830 return (error); 1831} 1832 1833int 1834mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 1835{ 1836 int error; 1837 1838 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 1839 1840 if (!mac_enforce_fs) 1841 return (0); 1842 1843 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); 1844 return (error); 1845} 1846 1847static int 1848mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 1849 struct label *newlabel) 1850{ 1851 int error; 1852 1853 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 1854 1855 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); 1856 1857 return (error); 1858} 1859 1860int 1861mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 1862 struct vnode *vp, struct componentname *cnp) 1863{ 1864 int error; 1865 1866 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 1867 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 1868 1869 if (!mac_enforce_fs) 1870 return (0); 1871 1872 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, 1873 &vp->v_label, cnp); 1874 return (error); 1875} 1876 1877int 1878mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 1879 struct vnode *vp, int samedir, struct componentname *cnp) 1880{ 1881 int error; 1882 1883 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 1884 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 1885 1886 if (!mac_enforce_fs) 1887 return (0); 1888 1889 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, 1890 vp != NULL ? &vp->v_label : NULL, samedir, cnp); 1891 return (error); 1892} 1893 1894int 1895mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 1896{ 1897 int error; 1898 1899 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 1900 1901 if (!mac_enforce_fs) 1902 return (0); 1903 1904 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); 1905 return (error); 1906} 1907 1908int 1909mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 1910 struct acl *acl) 1911{ 1912 int error; 1913 1914 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 1915 1916 if (!mac_enforce_fs) 1917 return (0); 1918 1919 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); 1920 return (error); 1921} 1922 1923int 1924mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 1925 int attrnamespace, const char *name, struct uio *uio) 1926{ 1927 int error; 1928 1929 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 1930 1931 if (!mac_enforce_fs) 1932 return (0); 1933 1934 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, 1935 attrnamespace, name, uio); 1936 return (error); 1937} 1938 1939int 1940mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 1941{ 1942 int error; 1943 1944 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 1945 1946 if (!mac_enforce_fs) 1947 return (0); 1948 1949 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); 1950 return (error); 1951} 1952 1953int 1954mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 1955{ 1956 int error; 1957 1958 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 1959 1960 if (!mac_enforce_fs) 1961 return (0); 1962 1963 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); 1964 return (error); 1965} 1966 1967int 1968mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 1969 gid_t gid) 1970{ 1971 int error; 1972 1973 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 1974 1975 if (!mac_enforce_fs) 1976 return (0); 1977 1978 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); 1979 return (error); 1980} 1981 1982int 1983mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 1984 struct timespec atime, struct timespec mtime) 1985{ 1986 int error; 1987 1988 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 1989 1990 if (!mac_enforce_fs) 1991 return (0); 1992 1993 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, 1994 mtime); 1995 return (error); 1996} 1997 1998int 1999mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2000 struct vnode *vp) 2001{ 2002 int error; 2003 2004 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 2005 2006 if (!mac_enforce_fs) 2007 return (0); 2008 2009 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 2010 &vp->v_label); 2011 return (error); 2012} 2013 2014int 2015mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 2016 struct vnode *vp) 2017{ 2018 int error; 2019 2020 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 2021 2022 if (!mac_enforce_fs) 2023 return (0); 2024 2025 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 2026 &vp->v_label); 2027 2028 return (error); 2029} 2030 2031/* 2032 * When relabeling a process, call out to the policies for the maximum 2033 * permission allowed for each object type we know about in its 2034 * memory space, and revoke access (in the least surprising ways we 2035 * know) when necessary. The process lock is not held here. 2036 */ 2037void 2038mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) 2039{ 2040 2041 /* XXX freeze all other threads */ 2042 mac_cred_mmapped_drop_perms_recurse(td, cred, 2043 &td->td_proc->p_vmspace->vm_map); 2044 /* XXX allow other threads to continue */ 2045} 2046 2047static __inline const char * 2048prot2str(vm_prot_t prot) 2049{ 2050 2051 switch (prot & VM_PROT_ALL) { 2052 case VM_PROT_READ: 2053 return ("r--"); 2054 case VM_PROT_READ | VM_PROT_WRITE: 2055 return ("rw-"); 2056 case VM_PROT_READ | VM_PROT_EXECUTE: 2057 return ("r-x"); 2058 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 2059 return ("rwx"); 2060 case VM_PROT_WRITE: 2061 return ("-w-"); 2062 case VM_PROT_EXECUTE: 2063 return ("--x"); 2064 case VM_PROT_WRITE | VM_PROT_EXECUTE: 2065 return ("-wx"); 2066 default: 2067 return ("---"); 2068 } 2069} 2070 2071static void 2072mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, 2073 struct vm_map *map) 2074{ 2075 struct vm_map_entry *vme; 2076 int result; 2077 vm_prot_t revokeperms; 2078 vm_object_t object; 2079 vm_ooffset_t offset; 2080 struct vnode *vp; 2081 2082 if (!mac_mmap_revocation) 2083 return; 2084 2085 vm_map_lock_read(map); 2086 for (vme = map->header.next; vme != &map->header; vme = vme->next) { 2087 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { 2088 mac_cred_mmapped_drop_perms_recurse(td, cred, 2089 vme->object.sub_map); 2090 continue; 2091 } 2092 /* 2093 * Skip over entries that obviously are not shared. 2094 */ 2095 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || 2096 !vme->max_protection) 2097 continue; 2098 /* 2099 * Drill down to the deepest backing object. 2100 */ 2101 offset = vme->offset; 2102 object = vme->object.vm_object; 2103 if (object == NULL) 2104 continue; 2105 while (object->backing_object != NULL) { 2106 object = object->backing_object; 2107 offset += object->backing_object_offset; 2108 } 2109 /* 2110 * At the moment, vm_maps and objects aren't considered 2111 * by the MAC system, so only things with backing by a 2112 * normal object (read: vnodes) are checked. 2113 */ 2114 if (object->type != OBJT_VNODE) 2115 continue; 2116 vp = (struct vnode *)object->handle; 2117 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2118 result = vme->max_protection; 2119 mac_check_vnode_mmap_downgrade(cred, vp, &result); 2120 VOP_UNLOCK(vp, 0, td); 2121 /* 2122 * Find out what maximum protection we may be allowing 2123 * now but a policy needs to get removed. 2124 */ 2125 revokeperms = vme->max_protection & ~result; 2126 if (!revokeperms) 2127 continue; 2128 printf("pid %ld: revoking %s perms from %#lx:%ld " 2129 "(max %s/cur %s)\n", (long)td->td_proc->p_pid, 2130 prot2str(revokeperms), (u_long)vme->start, 2131 (long)(vme->end - vme->start), 2132 prot2str(vme->max_protection), prot2str(vme->protection)); 2133 vm_map_lock_upgrade(map); 2134 /* 2135 * This is the really simple case: if a map has more 2136 * max_protection than is allowed, but it's not being 2137 * actually used (that is, the current protection is 2138 * still allowed), we can just wipe it out and do 2139 * nothing more. 2140 */ 2141 if ((vme->protection & revokeperms) == 0) { 2142 vme->max_protection -= revokeperms; 2143 } else { 2144 if (revokeperms & VM_PROT_WRITE) { 2145 /* 2146 * In the more complicated case, flush out all 2147 * pending changes to the object then turn it 2148 * copy-on-write. 2149 */ 2150 vm_object_reference(object); 2151 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2152 VM_OBJECT_LOCK(object); 2153 vm_object_page_clean(object, 2154 OFF_TO_IDX(offset), 2155 OFF_TO_IDX(offset + vme->end - vme->start + 2156 PAGE_MASK), 2157 OBJPC_SYNC); 2158 VM_OBJECT_UNLOCK(object); 2159 VOP_UNLOCK(vp, 0, td); 2160 vm_object_deallocate(object); 2161 /* 2162 * Why bother if there's no read permissions 2163 * anymore? For the rest, we need to leave 2164 * the write permissions on for COW, or 2165 * remove them entirely if configured to. 2166 */ 2167 if (!mac_mmap_revocation_via_cow) { 2168 vme->max_protection &= ~VM_PROT_WRITE; 2169 vme->protection &= ~VM_PROT_WRITE; 2170 } if ((revokeperms & VM_PROT_READ) == 0) 2171 vme->eflags |= MAP_ENTRY_COW | 2172 MAP_ENTRY_NEEDS_COPY; 2173 } 2174 if (revokeperms & VM_PROT_EXECUTE) { 2175 vme->max_protection &= ~VM_PROT_EXECUTE; 2176 vme->protection &= ~VM_PROT_EXECUTE; 2177 } 2178 if (revokeperms & VM_PROT_READ) { 2179 vme->max_protection = 0; 2180 vme->protection = 0; 2181 } 2182 pmap_protect(map->pmap, vme->start, vme->end, 2183 vme->protection & ~revokeperms); 2184 vm_map_simplify_entry(map, vme); 2185 } 2186 vm_map_lock_downgrade(map); 2187 } 2188 vm_map_unlock_read(map); 2189} 2190 2191/* 2192 * When the subject's label changes, it may require revocation of privilege 2193 * to mapped objects. This can't be done on-the-fly later with a unified 2194 * buffer cache. 2195 */ 2196static void 2197mac_relabel_cred(struct ucred *cred, struct label *newlabel) 2198{ 2199 2200 MAC_PERFORM(relabel_cred, cred, newlabel); 2201} 2202 2203void 2204mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 2205{ 2206 2207 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); 2208} 2209 2210void 2211mac_create_ifnet(struct ifnet *ifnet) 2212{ 2213 2214 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label); 2215} 2216 2217void 2218mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d) 2219{ 2220 2221 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label); 2222} 2223 2224void 2225mac_create_socket(struct ucred *cred, struct socket *socket) 2226{ 2227 2228 MAC_PERFORM(create_socket, cred, socket, &socket->so_label); 2229} 2230 2231void 2232mac_create_pipe(struct ucred *cred, struct pipe *pipe) 2233{ 2234 2235 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); 2236} 2237 2238void 2239mac_create_socket_from_socket(struct socket *oldsocket, 2240 struct socket *newsocket) 2241{ 2242 2243 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label, 2244 newsocket, &newsocket->so_label); 2245} 2246 2247static void 2248mac_relabel_socket(struct ucred *cred, struct socket *socket, 2249 struct label *newlabel) 2250{ 2251 2252 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); 2253} 2254 2255static void 2256mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) 2257{ 2258 2259 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); 2260} 2261 2262void 2263mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) 2264{ 2265 struct label *label; 2266 2267 label = mbuf_to_label(mbuf); 2268 2269 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, label, socket, 2270 &socket->so_peerlabel); 2271} 2272 2273void 2274mac_set_socket_peer_from_socket(struct socket *oldsocket, 2275 struct socket *newsocket) 2276{ 2277 2278 MAC_PERFORM(set_socket_peer_from_socket, oldsocket, 2279 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel); 2280} 2281 2282void 2283mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram) 2284{ 2285 struct label *label; 2286 2287 label = mbuf_to_label(datagram); 2288 2289 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label, 2290 datagram, label); 2291} 2292 2293void 2294mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment) 2295{ 2296 struct label *datagramlabel, *fragmentlabel; 2297 2298 datagramlabel = mbuf_to_label(datagram); 2299 fragmentlabel = mbuf_to_label(fragment); 2300 2301 MAC_PERFORM(create_fragment, datagram, datagramlabel, fragment, 2302 fragmentlabel); 2303} 2304 2305void 2306mac_create_ipq(struct mbuf *fragment, struct ipq *ipq) 2307{ 2308 struct label *label; 2309 2310 label = mbuf_to_label(fragment); 2311 2312 MAC_PERFORM(create_ipq, fragment, label, ipq, &ipq->ipq_label); 2313} 2314 2315void 2316mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2317{ 2318 struct label *oldmbuflabel, *newmbuflabel; 2319 2320 oldmbuflabel = mbuf_to_label(oldmbuf); 2321 newmbuflabel = mbuf_to_label(newmbuf); 2322 2323 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, oldmbuflabel, newmbuf, 2324 newmbuflabel); 2325} 2326 2327void 2328mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf) 2329{ 2330 struct label *label; 2331 2332 label = mbuf_to_label(mbuf); 2333 2334 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf, 2335 label); 2336} 2337 2338void 2339mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf) 2340{ 2341 struct label *label; 2342 2343 label = mbuf_to_label(mbuf); 2344 2345 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf, 2346 label); 2347} 2348 2349void 2350mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf) 2351{ 2352 struct label *label; 2353 2354 label = mbuf_to_label(mbuf); 2355 2356 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf, 2357 label); 2358} 2359 2360void 2361mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet, 2362 struct mbuf *newmbuf) 2363{ 2364 struct label *oldmbuflabel, *newmbuflabel; 2365 2366 oldmbuflabel = mbuf_to_label(oldmbuf); 2367 newmbuflabel = mbuf_to_label(newmbuf); 2368 2369 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, oldmbuflabel, 2370 ifnet, &ifnet->if_label, newmbuf, newmbuflabel); 2371} 2372 2373void 2374mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2375{ 2376 struct label *oldmbuflabel, *newmbuflabel; 2377 2378 oldmbuflabel = mbuf_to_label(oldmbuf); 2379 newmbuflabel = mbuf_to_label(newmbuf); 2380 2381 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, oldmbuflabel, newmbuf, 2382 newmbuflabel); 2383} 2384 2385int 2386mac_fragment_match(struct mbuf *fragment, struct ipq *ipq) 2387{ 2388 struct label *label; 2389 int result; 2390 2391 label = mbuf_to_label(fragment); 2392 2393 result = 1; 2394 MAC_BOOLEAN(fragment_match, &&, fragment, label, ipq, 2395 &ipq->ipq_label); 2396 2397 return (result); 2398} 2399 2400void 2401mac_update_ipq(struct mbuf *fragment, struct ipq *ipq) 2402{ 2403 struct label *label; 2404 2405 label = mbuf_to_label(fragment); 2406 2407 MAC_PERFORM(update_ipq, fragment, label, ipq, &ipq->ipq_label); 2408} 2409 2410void 2411mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) 2412{ 2413 struct label *label; 2414 2415 label = mbuf_to_label(mbuf); 2416 2417 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf, 2418 label); 2419} 2420 2421void 2422mac_create_mount(struct ucred *cred, struct mount *mp) 2423{ 2424 2425 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, 2426 &mp->mnt_fslabel); 2427} 2428 2429void 2430mac_create_root_mount(struct ucred *cred, struct mount *mp) 2431{ 2432 2433 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, 2434 &mp->mnt_fslabel); 2435} 2436 2437int 2438mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) 2439{ 2440 int error; 2441 2442 if (!mac_enforce_network) 2443 return (0); 2444 2445 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet, 2446 &ifnet->if_label); 2447 2448 return (error); 2449} 2450 2451static int 2452mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) 2453{ 2454 int error; 2455 2456 MAC_CHECK(check_cred_relabel, cred, newlabel); 2457 2458 return (error); 2459} 2460 2461int 2462mac_check_cred_visible(struct ucred *u1, struct ucred *u2) 2463{ 2464 int error; 2465 2466 if (!mac_enforce_process) 2467 return (0); 2468 2469 MAC_CHECK(check_cred_visible, u1, u2); 2470 2471 return (error); 2472} 2473 2474int 2475mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) 2476{ 2477 struct label *label; 2478 int error; 2479 2480 M_ASSERTPKTHDR(mbuf); 2481 2482 if (!mac_enforce_network) 2483 return (0); 2484 2485 label = mbuf_to_label(mbuf); 2486 2487 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf, 2488 label); 2489 2490 return (error); 2491} 2492 2493int 2494mac_check_kenv_dump(struct ucred *cred) 2495{ 2496 int error; 2497 2498 if (!mac_enforce_system) 2499 return (0); 2500 2501 MAC_CHECK(check_kenv_dump, cred); 2502 2503 return (error); 2504} 2505 2506int 2507mac_check_kenv_get(struct ucred *cred, char *name) 2508{ 2509 int error; 2510 2511 if (!mac_enforce_system) 2512 return (0); 2513 2514 MAC_CHECK(check_kenv_get, cred, name); 2515 2516 return (error); 2517} 2518 2519int 2520mac_check_kenv_set(struct ucred *cred, char *name, char *value) 2521{ 2522 int error; 2523 2524 if (!mac_enforce_system) 2525 return (0); 2526 2527 MAC_CHECK(check_kenv_set, cred, name, value); 2528 2529 return (error); 2530} 2531 2532int 2533mac_check_kenv_unset(struct ucred *cred, char *name) 2534{ 2535 int error; 2536 2537 if (!mac_enforce_system) 2538 return (0); 2539 2540 MAC_CHECK(check_kenv_unset, cred, name); 2541 2542 return (error); 2543} 2544 2545int 2546mac_check_kld_load(struct ucred *cred, struct vnode *vp) 2547{ 2548 int error; 2549 2550 ASSERT_VOP_LOCKED(vp, "mac_check_kld_load"); 2551 2552 if (!mac_enforce_kld) 2553 return (0); 2554 2555 MAC_CHECK(check_kld_load, cred, vp, &vp->v_label); 2556 2557 return (error); 2558} 2559 2560int 2561mac_check_kld_stat(struct ucred *cred) 2562{ 2563 int error; 2564 2565 if (!mac_enforce_kld) 2566 return (0); 2567 2568 MAC_CHECK(check_kld_stat, cred); 2569 2570 return (error); 2571} 2572 2573int 2574mac_check_kld_unload(struct ucred *cred) 2575{ 2576 int error; 2577 2578 if (!mac_enforce_kld) 2579 return (0); 2580 2581 MAC_CHECK(check_kld_unload, cred); 2582 2583 return (error); 2584} 2585 2586int 2587mac_check_mount_stat(struct ucred *cred, struct mount *mount) 2588{ 2589 int error; 2590 2591 if (!mac_enforce_fs) 2592 return (0); 2593 2594 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); 2595 2596 return (error); 2597} 2598 2599int 2600mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, 2601 void *data) 2602{ 2603 int error; 2604 2605 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2606 2607 if (!mac_enforce_pipe) 2608 return (0); 2609 2610 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); 2611 2612 return (error); 2613} 2614 2615int 2616mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) 2617{ 2618 int error; 2619 2620 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2621 2622 if (!mac_enforce_pipe) 2623 return (0); 2624 2625 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); 2626 2627 return (error); 2628} 2629 2630int 2631mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) 2632{ 2633 int error; 2634 2635 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2636 2637 if (!mac_enforce_pipe) 2638 return (0); 2639 2640 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); 2641 2642 return (error); 2643} 2644 2645static int 2646mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 2647 struct label *newlabel) 2648{ 2649 int error; 2650 2651 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2652 2653 if (!mac_enforce_pipe) 2654 return (0); 2655 2656 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); 2657 2658 return (error); 2659} 2660 2661int 2662mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) 2663{ 2664 int error; 2665 2666 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2667 2668 if (!mac_enforce_pipe) 2669 return (0); 2670 2671 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); 2672 2673 return (error); 2674} 2675 2676int 2677mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) 2678{ 2679 int error; 2680 2681 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2682 2683 if (!mac_enforce_pipe) 2684 return (0); 2685 2686 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); 2687 2688 return (error); 2689} 2690 2691int 2692mac_check_proc_debug(struct ucred *cred, struct proc *proc) 2693{ 2694 int error; 2695 2696 PROC_LOCK_ASSERT(proc, MA_OWNED); 2697 2698 if (!mac_enforce_process) 2699 return (0); 2700 2701 MAC_CHECK(check_proc_debug, cred, proc); 2702 2703 return (error); 2704} 2705 2706int 2707mac_check_proc_sched(struct ucred *cred, struct proc *proc) 2708{ 2709 int error; 2710 2711 PROC_LOCK_ASSERT(proc, MA_OWNED); 2712 2713 if (!mac_enforce_process) 2714 return (0); 2715 2716 MAC_CHECK(check_proc_sched, cred, proc); 2717 2718 return (error); 2719} 2720 2721int 2722mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 2723{ 2724 int error; 2725 2726 PROC_LOCK_ASSERT(proc, MA_OWNED); 2727 2728 if (!mac_enforce_process) 2729 return (0); 2730 2731 MAC_CHECK(check_proc_signal, cred, proc, signum); 2732 2733 return (error); 2734} 2735 2736int 2737mac_check_socket_bind(struct ucred *ucred, struct socket *socket, 2738 struct sockaddr *sockaddr) 2739{ 2740 int error; 2741 2742 if (!mac_enforce_socket) 2743 return (0); 2744 2745 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label, 2746 sockaddr); 2747 2748 return (error); 2749} 2750 2751int 2752mac_check_socket_connect(struct ucred *cred, struct socket *socket, 2753 struct sockaddr *sockaddr) 2754{ 2755 int error; 2756 2757 if (!mac_enforce_socket) 2758 return (0); 2759 2760 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label, 2761 sockaddr); 2762 2763 return (error); 2764} 2765 2766int 2767mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf) 2768{ 2769 struct label *label; 2770 int error; 2771 2772 if (!mac_enforce_socket) 2773 return (0); 2774 2775 label = mbuf_to_label(mbuf); 2776 2777 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf, 2778 label); 2779 2780 return (error); 2781} 2782 2783int 2784mac_check_socket_listen(struct ucred *cred, struct socket *socket) 2785{ 2786 int error; 2787 2788 if (!mac_enforce_socket) 2789 return (0); 2790 2791 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label); 2792 return (error); 2793} 2794 2795int 2796mac_check_socket_receive(struct ucred *cred, struct socket *so) 2797{ 2798 int error; 2799 2800 if (!mac_enforce_socket) 2801 return (0); 2802 2803 MAC_CHECK(check_socket_receive, cred, so, &so->so_label); 2804 2805 return (error); 2806} 2807 2808static int 2809mac_check_socket_relabel(struct ucred *cred, struct socket *socket, 2810 struct label *newlabel) 2811{ 2812 int error; 2813 2814 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label, 2815 newlabel); 2816 2817 return (error); 2818} 2819 2820int 2821mac_check_socket_send(struct ucred *cred, struct socket *so) 2822{ 2823 int error; 2824 2825 if (!mac_enforce_socket) 2826 return (0); 2827 2828 MAC_CHECK(check_socket_send, cred, so, &so->so_label); 2829 2830 return (error); 2831} 2832 2833int 2834mac_check_socket_visible(struct ucred *cred, struct socket *socket) 2835{ 2836 int error; 2837 2838 if (!mac_enforce_socket) 2839 return (0); 2840 2841 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label); 2842 2843 return (error); 2844} 2845 2846int 2847mac_check_sysarch_ioperm(struct ucred *cred) 2848{ 2849 int error; 2850 2851 if (!mac_enforce_system) 2852 return (0); 2853 2854 MAC_CHECK(check_sysarch_ioperm, cred); 2855 return (error); 2856} 2857 2858int 2859mac_check_system_acct(struct ucred *cred, struct vnode *vp) 2860{ 2861 int error; 2862 2863 if (vp != NULL) { 2864 ASSERT_VOP_LOCKED(vp, "mac_check_system_acct"); 2865 } 2866 2867 if (!mac_enforce_system) 2868 return (0); 2869 2870 MAC_CHECK(check_system_acct, cred, vp, 2871 vp != NULL ? &vp->v_label : NULL); 2872 2873 return (error); 2874} 2875 2876int 2877mac_check_system_nfsd(struct ucred *cred) 2878{ 2879 int error; 2880 2881 if (!mac_enforce_system) 2882 return (0); 2883 2884 MAC_CHECK(check_system_nfsd, cred); 2885 2886 return (error); 2887} 2888 2889int 2890mac_check_system_reboot(struct ucred *cred, int howto) 2891{ 2892 int error; 2893 2894 if (!mac_enforce_system) 2895 return (0); 2896 2897 MAC_CHECK(check_system_reboot, cred, howto); 2898 2899 return (error); 2900} 2901 2902int 2903mac_check_system_settime(struct ucred *cred) 2904{ 2905 int error; 2906 2907 if (!mac_enforce_system) 2908 return (0); 2909 2910 MAC_CHECK(check_system_settime, cred); 2911 2912 return (error); 2913} 2914 2915int 2916mac_check_system_swapon(struct ucred *cred, struct vnode *vp) 2917{ 2918 int error; 2919 2920 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon"); 2921 2922 if (!mac_enforce_system) 2923 return (0); 2924 2925 MAC_CHECK(check_system_swapon, cred, vp, &vp->v_label); 2926 return (error); 2927} 2928 2929int 2930mac_check_system_swapoff(struct ucred *cred, struct vnode *vp) 2931{ 2932 int error; 2933 2934 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapoff"); 2935 2936 if (!mac_enforce_system) 2937 return (0); 2938 2939 MAC_CHECK(check_system_swapoff, cred, vp, &vp->v_label); 2940 return (error); 2941} 2942 2943int 2944mac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen, 2945 void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen) 2946{ 2947 int error; 2948 2949 /* 2950 * XXXMAC: We're very much like to assert the SYSCTL_LOCK here, 2951 * but since it's not exported from kern_sysctl.c, we can't. 2952 */ 2953 if (!mac_enforce_system) 2954 return (0); 2955 2956 MAC_CHECK(check_system_sysctl, cred, name, namelen, old, oldlenp, 2957 inkernel, new, newlen); 2958 2959 return (error); 2960} 2961 2962int 2963mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 2964 struct ifnet *ifnet) 2965{ 2966 char *elements, *buffer; 2967 struct mac mac; 2968 int error; 2969 2970 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 2971 if (error) 2972 return (error); 2973 2974 error = mac_check_structmac_consistent(&mac); 2975 if (error) 2976 return (error); 2977 2978 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2979 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 2980 if (error) { 2981 free(elements, M_MACTEMP); 2982 return (error); 2983 } 2984 2985 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 2986 error = mac_externalize_ifnet_label(&ifnet->if_label, elements, 2987 buffer, mac.m_buflen, M_WAITOK); 2988 if (error == 0) 2989 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 2990 2991 free(buffer, M_MACTEMP); 2992 free(elements, M_MACTEMP); 2993 2994 return (error); 2995} 2996 2997int 2998mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 2999 struct ifnet *ifnet) 3000{ 3001 struct label intlabel; 3002 struct mac mac; 3003 char *buffer; 3004 int error; 3005 3006 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 3007 if (error) 3008 return (error); 3009 3010 error = mac_check_structmac_consistent(&mac); 3011 if (error) 3012 return (error); 3013 3014 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3015 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3016 if (error) { 3017 free(buffer, M_MACTEMP); 3018 return (error); 3019 } 3020 3021 mac_init_ifnet_label(&intlabel); 3022 error = mac_internalize_ifnet_label(&intlabel, buffer); 3023 free(buffer, M_MACTEMP); 3024 if (error) { 3025 mac_destroy_ifnet_label(&intlabel); 3026 return (error); 3027 } 3028 3029 /* 3030 * XXX: Note that this is a redundant privilege check, since 3031 * policies impose this check themselves if required by the 3032 * policy. Eventually, this should go away. 3033 */ 3034 error = suser_cred(cred, 0); 3035 if (error) { 3036 mac_destroy_ifnet_label(&intlabel); 3037 return (error); 3038 } 3039 3040 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label, 3041 &intlabel); 3042 if (error) { 3043 mac_destroy_ifnet_label(&intlabel); 3044 return (error); 3045 } 3046 3047 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel); 3048 3049 mac_destroy_ifnet_label(&intlabel); 3050 return (0); 3051} 3052 3053void 3054mac_create_devfs_device(struct mount *mp, dev_t dev, struct devfs_dirent *de) 3055{ 3056 3057 MAC_PERFORM(create_devfs_device, mp, dev, de, &de->de_label); 3058} 3059 3060void 3061mac_create_devfs_symlink(struct ucred *cred, struct mount *mp, 3062 struct devfs_dirent *dd, struct devfs_dirent *de) 3063{ 3064 3065 MAC_PERFORM(create_devfs_symlink, cred, mp, dd, &dd->de_label, de, 3066 &de->de_label); 3067} 3068 3069void 3070mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen, 3071 struct devfs_dirent *de) 3072{ 3073 3074 MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de, 3075 &de->de_label); 3076} 3077 3078int 3079mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 3080 struct mac *mac) 3081{ 3082 struct label intlabel; 3083 char *buffer; 3084 int error; 3085 3086 error = mac_check_structmac_consistent(mac); 3087 if (error) 3088 return (error); 3089 3090 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3091 error = copyinstr(mac->m_string, buffer, mac->m_buflen, NULL); 3092 if (error) { 3093 free(buffer, M_MACTEMP); 3094 return (error); 3095 } 3096 3097 mac_init_socket_label(&intlabel, M_WAITOK); 3098 error = mac_internalize_socket_label(&intlabel, buffer); 3099 free(buffer, M_MACTEMP); 3100 if (error) { 3101 mac_destroy_socket_label(&intlabel); 3102 return (error); 3103 } 3104 3105 mac_check_socket_relabel(cred, so, &intlabel); 3106 if (error) { 3107 mac_destroy_socket_label(&intlabel); 3108 return (error); 3109 } 3110 3111 mac_relabel_socket(cred, so, &intlabel); 3112 3113 mac_destroy_socket_label(&intlabel); 3114 return (0); 3115} 3116 3117int 3118mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) 3119{ 3120 int error; 3121 3122 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 3123 3124 error = mac_check_pipe_relabel(cred, pipe, label); 3125 if (error) 3126 return (error); 3127 3128 mac_relabel_pipe(cred, pipe, label); 3129 3130 return (0); 3131} 3132 3133int 3134mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 3135 struct mac *mac) 3136{ 3137 char *buffer, *elements; 3138 int error; 3139 3140 error = mac_check_structmac_consistent(mac); 3141 if (error) 3142 return (error); 3143 3144 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3145 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 3146 if (error) { 3147 free(elements, M_MACTEMP); 3148 return (error); 3149 } 3150 3151 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3152 error = mac_externalize_socket_label(&so->so_label, elements, 3153 buffer, mac->m_buflen, M_WAITOK); 3154 if (error == 0) 3155 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 3156 3157 free(buffer, M_MACTEMP); 3158 free(elements, M_MACTEMP); 3159 3160 return (error); 3161} 3162 3163int 3164mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 3165 struct mac *mac) 3166{ 3167 char *elements, *buffer; 3168 int error; 3169 3170 error = mac_check_structmac_consistent(mac); 3171 if (error) 3172 return (error); 3173 3174 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3175 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 3176 if (error) { 3177 free(elements, M_MACTEMP); 3178 return (error); 3179 } 3180 3181 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3182 error = mac_externalize_socket_peer_label(&so->so_peerlabel, 3183 elements, buffer, mac->m_buflen, M_WAITOK); 3184 if (error == 0) 3185 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 3186 3187 free(buffer, M_MACTEMP); 3188 free(elements, M_MACTEMP); 3189 3190 return (error); 3191} 3192 3193/* 3194 * Implementation of VOP_SETLABEL() that relies on extended attributes 3195 * to store label data. Can be referenced by filesystems supporting 3196 * extended attributes. 3197 */ 3198int 3199vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 3200{ 3201 struct vnode *vp = ap->a_vp; 3202 struct label *intlabel = ap->a_label; 3203 int error; 3204 3205 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 3206 3207 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3208 return (EOPNOTSUPP); 3209 3210 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); 3211 if (error) 3212 return (error); 3213 3214 mac_relabel_vnode(ap->a_cred, vp, intlabel); 3215 3216 return (0); 3217} 3218 3219static int 3220vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 3221{ 3222 int error; 3223 3224 if (vp->v_mount == NULL) { 3225 /* printf("vn_setlabel: null v_mount\n"); */ 3226 if (vp->v_type != VNON) 3227 printf("vn_setlabel: null v_mount with non-VNON\n"); 3228 return (EBADF); 3229 } 3230 3231 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3232 return (EOPNOTSUPP); 3233 3234 /* 3235 * Multi-phase commit. First check the policies to confirm the 3236 * change is OK. Then commit via the filesystem. Finally, 3237 * update the actual vnode label. Question: maybe the filesystem 3238 * should update the vnode at the end as part of VOP_SETLABEL()? 3239 */ 3240 error = mac_check_vnode_relabel(cred, vp, intlabel); 3241 if (error) 3242 return (error); 3243 3244 /* 3245 * VADMIN provides the opportunity for the filesystem to make 3246 * decisions about who is and is not able to modify labels 3247 * and protections on files. This might not be right. We can't 3248 * assume VOP_SETLABEL() will do it, because we might implement 3249 * that as part of vop_stdsetlabel_ea(). 3250 */ 3251 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 3252 if (error) 3253 return (error); 3254 3255 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 3256 if (error) 3257 return (error); 3258 3259 return (0); 3260} 3261 3262int 3263__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3264{ 3265 char *elements, *buffer; 3266 struct mac mac; 3267 struct proc *tproc; 3268 struct ucred *tcred; 3269 int error; 3270 3271 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3272 if (error) 3273 return (error); 3274 3275 error = mac_check_structmac_consistent(&mac); 3276 if (error) 3277 return (error); 3278 3279 tproc = pfind(uap->pid); 3280 if (tproc == NULL) 3281 return (ESRCH); 3282 3283 tcred = NULL; /* Satisfy gcc. */ 3284 error = p_cansee(td, tproc); 3285 if (error == 0) 3286 tcred = crhold(tproc->p_ucred); 3287 PROC_UNLOCK(tproc); 3288 if (error) 3289 return (error); 3290 3291 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3292 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3293 if (error) { 3294 free(elements, M_MACTEMP); 3295 crfree(tcred); 3296 return (error); 3297 } 3298 3299 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3300 error = mac_externalize_cred_label(&tcred->cr_label, elements, 3301 buffer, mac.m_buflen, M_WAITOK); 3302 if (error == 0) 3303 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3304 3305 free(buffer, M_MACTEMP); 3306 free(elements, M_MACTEMP); 3307 crfree(tcred); 3308 return (error); 3309} 3310 3311/* 3312 * MPSAFE 3313 */ 3314int 3315__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3316{ 3317 char *elements, *buffer; 3318 struct mac mac; 3319 int error; 3320 3321 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3322 if (error) 3323 return (error); 3324 3325 error = mac_check_structmac_consistent(&mac); 3326 if (error) 3327 return (error); 3328 3329 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3330 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3331 if (error) { 3332 free(elements, M_MACTEMP); 3333 return (error); 3334 } 3335 3336 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3337 error = mac_externalize_cred_label(&td->td_ucred->cr_label, 3338 elements, buffer, mac.m_buflen, M_WAITOK); 3339 if (error == 0) 3340 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3341 3342 free(buffer, M_MACTEMP); 3343 free(elements, M_MACTEMP); 3344 return (error); 3345} 3346 3347/* 3348 * MPSAFE 3349 */ 3350int 3351__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3352{ 3353 struct ucred *newcred, *oldcred; 3354 struct label intlabel; 3355 struct proc *p; 3356 struct mac mac; 3357 char *buffer; 3358 int error; 3359 3360 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3361 if (error) 3362 return (error); 3363 3364 error = mac_check_structmac_consistent(&mac); 3365 if (error) 3366 return (error); 3367 3368 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3369 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3370 if (error) { 3371 free(buffer, M_MACTEMP); 3372 return (error); 3373 } 3374 3375 mac_init_cred_label(&intlabel); 3376 error = mac_internalize_cred_label(&intlabel, buffer); 3377 free(buffer, M_MACTEMP); 3378 if (error) { 3379 mac_destroy_cred_label(&intlabel); 3380 return (error); 3381 } 3382 3383 newcred = crget(); 3384 3385 p = td->td_proc; 3386 PROC_LOCK(p); 3387 oldcred = p->p_ucred; 3388 3389 error = mac_check_cred_relabel(oldcred, &intlabel); 3390 if (error) { 3391 PROC_UNLOCK(p); 3392 crfree(newcred); 3393 goto out; 3394 } 3395 3396 setsugid(p); 3397 crcopy(newcred, oldcred); 3398 mac_relabel_cred(newcred, &intlabel); 3399 p->p_ucred = newcred; 3400 3401 /* 3402 * Grab additional reference for use while revoking mmaps, prior 3403 * to releasing the proc lock and sharing the cred. 3404 */ 3405 crhold(newcred); 3406 PROC_UNLOCK(p); 3407 3408 if (mac_enforce_vm) { 3409 mtx_lock(&Giant); 3410 mac_cred_mmapped_drop_perms(td, newcred); 3411 mtx_unlock(&Giant); 3412 } 3413 3414 crfree(newcred); /* Free revocation reference. */ 3415 crfree(oldcred); 3416 3417out: 3418 mac_destroy_cred_label(&intlabel); 3419 return (error); 3420} 3421 3422/* 3423 * MPSAFE 3424 */ 3425int 3426__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3427{ 3428 char *elements, *buffer; 3429 struct label intlabel; 3430 struct file *fp; 3431 struct mac mac; 3432 struct vnode *vp; 3433 struct pipe *pipe; 3434 short label_type; 3435 int error; 3436 3437 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3438 if (error) 3439 return (error); 3440 3441 error = mac_check_structmac_consistent(&mac); 3442 if (error) 3443 return (error); 3444 3445 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3446 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3447 if (error) { 3448 free(elements, M_MACTEMP); 3449 return (error); 3450 } 3451 3452 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3453 mtx_lock(&Giant); /* VFS */ 3454 error = fget(td, uap->fd, &fp); 3455 if (error) 3456 goto out; 3457 3458 label_type = fp->f_type; 3459 switch (fp->f_type) { 3460 case DTYPE_FIFO: 3461 case DTYPE_VNODE: 3462 vp = fp->f_vnode; 3463 3464 mac_init_vnode_label(&intlabel); 3465 3466 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3467 mac_copy_vnode_label(&vp->v_label, &intlabel); 3468 VOP_UNLOCK(vp, 0, td); 3469 3470 break; 3471 case DTYPE_PIPE: 3472 pipe = fp->f_data; 3473 3474 mac_init_pipe_label(&intlabel); 3475 3476 PIPE_LOCK(pipe); 3477 mac_copy_pipe_label(pipe->pipe_label, &intlabel); 3478 PIPE_UNLOCK(pipe); 3479 break; 3480 default: 3481 error = EINVAL; 3482 fdrop(fp, td); 3483 goto out; 3484 } 3485 fdrop(fp, td); 3486 3487 switch (label_type) { 3488 case DTYPE_FIFO: 3489 case DTYPE_VNODE: 3490 if (error == 0) 3491 error = mac_externalize_vnode_label(&intlabel, 3492 elements, buffer, mac.m_buflen, M_WAITOK); 3493 mac_destroy_vnode_label(&intlabel); 3494 break; 3495 case DTYPE_PIPE: 3496 error = mac_externalize_pipe_label(&intlabel, elements, 3497 buffer, mac.m_buflen, M_WAITOK); 3498 mac_destroy_pipe_label(&intlabel); 3499 break; 3500 default: 3501 panic("__mac_get_fd: corrupted label_type"); 3502 } 3503 3504 if (error == 0) 3505 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3506 3507out: 3508 mtx_unlock(&Giant); /* VFS */ 3509 free(buffer, M_MACTEMP); 3510 free(elements, M_MACTEMP); 3511 3512 return (error); 3513} 3514 3515/* 3516 * MPSAFE 3517 */ 3518int 3519__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3520{ 3521 char *elements, *buffer; 3522 struct nameidata nd; 3523 struct label intlabel; 3524 struct mac mac; 3525 int error; 3526 3527 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3528 if (error) 3529 return (error); 3530 3531 error = mac_check_structmac_consistent(&mac); 3532 if (error) 3533 return (error); 3534 3535 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3536 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3537 if (error) { 3538 free(elements, M_MACTEMP); 3539 return (error); 3540 } 3541 3542 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3543 mtx_lock(&Giant); /* VFS */ 3544 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3545 td); 3546 error = namei(&nd); 3547 if (error) 3548 goto out; 3549 3550 mac_init_vnode_label(&intlabel); 3551 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3552 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3553 mac.m_buflen, M_WAITOK); 3554 3555 NDFREE(&nd, 0); 3556 mac_destroy_vnode_label(&intlabel); 3557 3558 if (error == 0) 3559 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3560 3561out: 3562 mtx_unlock(&Giant); /* VFS */ 3563 3564 free(buffer, M_MACTEMP); 3565 free(elements, M_MACTEMP); 3566 3567 return (error); 3568} 3569 3570/* 3571 * MPSAFE 3572 */ 3573int 3574__mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3575{ 3576 char *elements, *buffer; 3577 struct nameidata nd; 3578 struct label intlabel; 3579 struct mac mac; 3580 int error; 3581 3582 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3583 if (error) 3584 return (error); 3585 3586 error = mac_check_structmac_consistent(&mac); 3587 if (error) 3588 return (error); 3589 3590 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3591 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3592 if (error) { 3593 free(elements, M_MACTEMP); 3594 return (error); 3595 } 3596 3597 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3598 mtx_lock(&Giant); /* VFS */ 3599 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3600 td); 3601 error = namei(&nd); 3602 if (error) 3603 goto out; 3604 3605 mac_init_vnode_label(&intlabel); 3606 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3607 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3608 mac.m_buflen, M_WAITOK); 3609 NDFREE(&nd, 0); 3610 mac_destroy_vnode_label(&intlabel); 3611 3612 if (error == 0) 3613 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3614 3615out: 3616 mtx_unlock(&Giant); /* VFS */ 3617 3618 free(buffer, M_MACTEMP); 3619 free(elements, M_MACTEMP); 3620 3621 return (error); 3622} 3623 3624/* 3625 * MPSAFE 3626 */ 3627int 3628__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3629{ 3630 struct label intlabel; 3631 struct pipe *pipe; 3632 struct file *fp; 3633 struct mount *mp; 3634 struct vnode *vp; 3635 struct mac mac; 3636 char *buffer; 3637 int error; 3638 3639 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3640 if (error) 3641 return (error); 3642 3643 error = mac_check_structmac_consistent(&mac); 3644 if (error) 3645 return (error); 3646 3647 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3648 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3649 if (error) { 3650 free(buffer, M_MACTEMP); 3651 return (error); 3652 } 3653 3654 mtx_lock(&Giant); /* VFS */ 3655 3656 error = fget(td, uap->fd, &fp); 3657 if (error) 3658 goto out; 3659 3660 switch (fp->f_type) { 3661 case DTYPE_FIFO: 3662 case DTYPE_VNODE: 3663 mac_init_vnode_label(&intlabel); 3664 error = mac_internalize_vnode_label(&intlabel, buffer); 3665 if (error) { 3666 mac_destroy_vnode_label(&intlabel); 3667 break; 3668 } 3669 3670 vp = fp->f_vnode; 3671 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3672 if (error != 0) { 3673 mac_destroy_vnode_label(&intlabel); 3674 break; 3675 } 3676 3677 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3678 error = vn_setlabel(vp, &intlabel, td->td_ucred); 3679 VOP_UNLOCK(vp, 0, td); 3680 vn_finished_write(mp); 3681 3682 mac_destroy_vnode_label(&intlabel); 3683 break; 3684 3685 case DTYPE_PIPE: 3686 mac_init_pipe_label(&intlabel); 3687 error = mac_internalize_pipe_label(&intlabel, buffer); 3688 if (error == 0) { 3689 pipe = fp->f_data; 3690 PIPE_LOCK(pipe); 3691 error = mac_pipe_label_set(td->td_ucred, pipe, 3692 &intlabel); 3693 PIPE_UNLOCK(pipe); 3694 } 3695 3696 mac_destroy_pipe_label(&intlabel); 3697 break; 3698 3699 default: 3700 error = EINVAL; 3701 } 3702 3703 fdrop(fp, td); 3704out: 3705 mtx_unlock(&Giant); /* VFS */ 3706 3707 free(buffer, M_MACTEMP); 3708 3709 return (error); 3710} 3711 3712/* 3713 * MPSAFE 3714 */ 3715int 3716__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3717{ 3718 struct label intlabel; 3719 struct nameidata nd; 3720 struct mount *mp; 3721 struct mac mac; 3722 char *buffer; 3723 int error; 3724 3725 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3726 if (error) 3727 return (error); 3728 3729 error = mac_check_structmac_consistent(&mac); 3730 if (error) 3731 return (error); 3732 3733 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3734 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3735 if (error) { 3736 free(buffer, M_MACTEMP); 3737 return (error); 3738 } 3739 3740 mac_init_vnode_label(&intlabel); 3741 error = mac_internalize_vnode_label(&intlabel, buffer); 3742 free(buffer, M_MACTEMP); 3743 if (error) { 3744 mac_destroy_vnode_label(&intlabel); 3745 return (error); 3746 } 3747 3748 mtx_lock(&Giant); /* VFS */ 3749 3750 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3751 td); 3752 error = namei(&nd); 3753 if (error == 0) { 3754 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3755 if (error == 0) 3756 error = vn_setlabel(nd.ni_vp, &intlabel, 3757 td->td_ucred); 3758 vn_finished_write(mp); 3759 } 3760 3761 NDFREE(&nd, 0); 3762 mtx_unlock(&Giant); /* VFS */ 3763 mac_destroy_vnode_label(&intlabel); 3764 3765 return (error); 3766} 3767 3768/* 3769 * MPSAFE 3770 */ 3771int 3772__mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3773{ 3774 struct label intlabel; 3775 struct nameidata nd; 3776 struct mount *mp; 3777 struct mac mac; 3778 char *buffer; 3779 int error; 3780 3781 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3782 if (error) 3783 return (error); 3784 3785 error = mac_check_structmac_consistent(&mac); 3786 if (error) 3787 return (error); 3788 3789 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3790 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3791 if (error) { 3792 free(buffer, M_MACTEMP); 3793 return (error); 3794 } 3795 3796 mac_init_vnode_label(&intlabel); 3797 error = mac_internalize_vnode_label(&intlabel, buffer); 3798 free(buffer, M_MACTEMP); 3799 if (error) { 3800 mac_destroy_vnode_label(&intlabel); 3801 return (error); 3802 } 3803 3804 mtx_lock(&Giant); /* VFS */ 3805 3806 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3807 td); 3808 error = namei(&nd); 3809 if (error == 0) { 3810 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3811 if (error == 0) 3812 error = vn_setlabel(nd.ni_vp, &intlabel, 3813 td->td_ucred); 3814 vn_finished_write(mp); 3815 } 3816 3817 NDFREE(&nd, 0); 3818 mtx_unlock(&Giant); /* VFS */ 3819 mac_destroy_vnode_label(&intlabel); 3820 3821 return (error); 3822} 3823 3824/* 3825 * MPSAFE 3826 */ 3827int 3828mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3829{ 3830 struct mac_policy_conf *mpc; 3831 char target[MAC_MAX_POLICY_NAME]; 3832 int entrycount, error; 3833 3834 error = copyinstr(uap->policy, target, sizeof(target), NULL); 3835 if (error) 3836 return (error); 3837 3838 error = ENOSYS; 3839 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3840 if (strcmp(mpc->mpc_name, target) == 0 && 3841 mpc->mpc_ops->mpo_syscall != NULL) { 3842 error = mpc->mpc_ops->mpo_syscall(td, 3843 uap->call, uap->arg); 3844 goto out; 3845 } 3846 } 3847 3848 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { 3849 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3850 if (strcmp(mpc->mpc_name, target) == 0 && 3851 mpc->mpc_ops->mpo_syscall != NULL) { 3852 error = mpc->mpc_ops->mpo_syscall(td, 3853 uap->call, uap->arg); 3854 break; 3855 } 3856 } 3857 mac_policy_list_unbusy(); 3858 } 3859out: 3860 return (error); 3861} 3862 3863SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); 3864SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); 3865 3866#else /* !MAC */ 3867 3868int 3869__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3870{ 3871 3872 return (ENOSYS); 3873} 3874 3875int 3876__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3877{ 3878 3879 return (ENOSYS); 3880} 3881 3882int 3883__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3884{ 3885 3886 return (ENOSYS); 3887} 3888 3889int 3890__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3891{ 3892 3893 return (ENOSYS); 3894} 3895 3896int 3897__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3898{ 3899 3900 return (ENOSYS); 3901} 3902 3903int 3904__mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3905{ 3906 3907 return (ENOSYS); 3908} 3909 3910int 3911__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3912{ 3913 3914 return (ENOSYS); 3915} 3916 3917int 3918__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3919{ 3920 3921 return (ENOSYS); 3922} 3923 3924int 3925__mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3926{ 3927 3928 return (ENOSYS); 3929} 3930 3931int 3932mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3933{ 3934 3935 return (ENOSYS); 3936} 3937 3938#endif 3939