mac_cred.c revision 116701
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_process.c 116701 2003-06-23 01:26:34Z 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#ifndef MAC_ALWAYS_LABEL_MBUF 125/* 126 * Flag to indicate whether or not we should allocate label storage for 127 * new mbufs. Since most dynamic policies we currently work with don't 128 * rely on mbuf labeling, try to avoid paying the cost of mtag allocation 129 * unless specifically notified of interest. One result of this is 130 * that if a dynamically loaded policy requests mbuf labels, it must 131 * be able to deal with a NULL label being returned on any mbufs that 132 * were already in flight when the policy was loaded. Since the policy 133 * already has to deal with uninitialized labels, this probably won't 134 * be a problem. Note: currently no locking. Will this be a problem? 135 */ 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 206SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD, 207 &nmacmbufs, 0, "number of mbufs in use"); 208SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD, 209 &nmaccreds, 0, "number of ucreds in use"); 210SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD, 211 &nmacifnets, 0, "number of ifnets in use"); 212SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD, 213 &nmacipqs, 0, "number of ipqs in use"); 214SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD, 215 &nmacbpfdescs, 0, "number of bpfdescs in use"); 216SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD, 217 &nmacsockets, 0, "number of sockets in use"); 218SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD, 219 &nmacpipes, 0, "number of pipes in use"); 220SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, procs, CTLFLAG_RD, 221 &nmacprocs, 0, "number of procs in use"); 222SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD, 223 &nmacmounts, 0, "number of mounts in use"); 224SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD, 225 &nmactemp, 0, "number of temporary labels in use"); 226SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD, 227 &nmacvnodes, 0, "number of vnodes in use"); 228SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD, 229 &nmacdevfsdirents, 0, "number of devfs dirents inuse"); 230#endif 231 232static int error_select(int error1, int error2); 233static int mac_policy_register(struct mac_policy_conf *mpc); 234static int mac_policy_unregister(struct mac_policy_conf *mpc); 235 236static void mac_check_vnode_mmap_downgrade(struct ucred *cred, 237 struct vnode *vp, int *prot); 238static void mac_cred_mmapped_drop_perms_recurse(struct thread *td, 239 struct ucred *cred, struct vm_map *map); 240 241static void mac_destroy_socket_label(struct label *label); 242 243static int mac_setlabel_vnode_extattr(struct ucred *cred, 244 struct vnode *vp, struct label *intlabel); 245 246MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes"); 247MALLOC_DEFINE(M_MACTEMP, "mactemp", "MAC temporary label storage"); 248 249/* 250 * mac_static_policy_list holds a list of policy modules that are not 251 * loaded while the system is "live", and cannot be unloaded. These 252 * policies can be invoked without holding the busy count. 253 * 254 * mac_policy_list stores the list of dynamic policies. A busy count is 255 * maintained for the list, stored in mac_policy_busy. The busy count 256 * is protected by mac_policy_mtx; the list may be modified only 257 * while the busy count is 0, requiring that the lock be held to 258 * prevent new references to the list from being acquired. For almost 259 * all operations, incrementing the busy count is sufficient to 260 * guarantee consistency, as the list cannot be modified while the 261 * busy count is elevated. For a few special operations involving a 262 * change to the list of active policies, the mtx itself must be held. 263 * A condition variable, mac_policy_cv, is used to signal potential 264 * exclusive consumers that they should try to acquire the lock if a 265 * first attempt at exclusive access fails. 266 */ 267static struct mtx mac_policy_mtx; 268static struct cv mac_policy_cv; 269static int mac_policy_count; 270static LIST_HEAD(, mac_policy_conf) mac_policy_list; 271static LIST_HEAD(, mac_policy_conf) mac_static_policy_list; 272 273/* 274 * We manually invoke WITNESS_WARN() to allow Witness to generate 275 * warnings even if we don't end up ever triggering the wait at 276 * run-time. The consumer of the exclusive interface must not hold 277 * any locks (other than potentially Giant) since we may sleep for 278 * long (potentially indefinite) periods of time waiting for the 279 * framework to become quiescent so that a policy list change may 280 * be made. 281 */ 282static __inline void 283mac_policy_grab_exclusive(void) 284{ 285 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 286 "mac_policy_grab_exclusive() at %s:%d", __FILE__, __LINE__); 287 mtx_lock(&mac_policy_mtx); 288 while (mac_policy_count != 0) 289 cv_wait(&mac_policy_cv, &mac_policy_mtx); 290} 291 292static __inline void 293mac_policy_assert_exclusive(void) 294{ 295 mtx_assert(&mac_policy_mtx, MA_OWNED); 296 KASSERT(mac_policy_count == 0, 297 ("mac_policy_assert_exclusive(): not exclusive")); 298} 299 300static __inline void 301mac_policy_release_exclusive(void) 302{ 303 304 KASSERT(mac_policy_count == 0, 305 ("mac_policy_release_exclusive(): not exclusive")); 306 mtx_unlock(&mac_policy_mtx); 307 cv_signal(&mac_policy_cv); 308} 309 310static __inline void 311mac_policy_list_busy(void) 312{ 313 mtx_lock(&mac_policy_mtx); 314 mac_policy_count++; 315 mtx_unlock(&mac_policy_mtx); 316} 317 318static __inline int 319mac_policy_list_conditional_busy(void) 320{ 321 int ret; 322 323 mtx_lock(&mac_policy_mtx); 324 if (!LIST_EMPTY(&mac_policy_list)) { 325 mac_policy_count++; 326 ret = 1; 327 } else 328 ret = 0; 329 mtx_unlock(&mac_policy_mtx); 330 return (ret); 331} 332 333static __inline void 334mac_policy_list_unbusy(void) 335{ 336 mtx_lock(&mac_policy_mtx); 337 mac_policy_count--; 338 KASSERT(mac_policy_count >= 0, ("MAC_POLICY_LIST_LOCK")); 339 if (mac_policy_count == 0) 340 cv_signal(&mac_policy_cv); 341 mtx_unlock(&mac_policy_mtx); 342} 343 344/* 345 * MAC_CHECK performs the designated check by walking the policy 346 * module list and checking with each as to how it feels about the 347 * request. Note that it returns its value via 'error' in the scope 348 * of the caller. 349 */ 350#define MAC_CHECK(check, args...) do { \ 351 struct mac_policy_conf *mpc; \ 352 int entrycount; \ 353 \ 354 error = 0; \ 355 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 356 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 357 error = error_select( \ 358 mpc->mpc_ops->mpo_ ## check (args), \ 359 error); \ 360 } \ 361 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 362 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 363 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 364 error = error_select( \ 365 mpc->mpc_ops->mpo_ ## check (args), \ 366 error); \ 367 } \ 368 mac_policy_list_unbusy(); \ 369 } \ 370} while (0) 371 372/* 373 * MAC_BOOLEAN performs the designated boolean composition by walking 374 * the module list, invoking each instance of the operation, and 375 * combining the results using the passed C operator. Note that it 376 * returns its value via 'result' in the scope of the caller, which 377 * should be initialized by the caller in a meaningful way to get 378 * a meaningful result. 379 */ 380#define MAC_BOOLEAN(operation, composition, args...) do { \ 381 struct mac_policy_conf *mpc; \ 382 int entrycount; \ 383 \ 384 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 385 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 386 result = result composition \ 387 mpc->mpc_ops->mpo_ ## operation (args); \ 388 } \ 389 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 390 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 391 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 392 result = result composition \ 393 mpc->mpc_ops->mpo_ ## operation \ 394 (args); \ 395 } \ 396 mac_policy_list_unbusy(); \ 397 } \ 398} while (0) 399 400#define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \ 401 outbuflen) do { \ 402 int claimed, first, ignorenotfound, savedlen; \ 403 char *element_name, *element_temp; \ 404 struct sbuf sb; \ 405 \ 406 error = 0; \ 407 first = 1; \ 408 sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \ 409 element_temp = elementlist; \ 410 while ((element_name = strsep(&element_temp, ",")) != NULL) { \ 411 if (element_name[0] == '?') { \ 412 element_name++; \ 413 ignorenotfound = 1; \ 414 } else \ 415 ignorenotfound = 0; \ 416 savedlen = sbuf_len(&sb); \ 417 if (first) { \ 418 error = sbuf_printf(&sb, "%s/", element_name); \ 419 first = 0; \ 420 } else \ 421 error = sbuf_printf(&sb, ",%s/", element_name); \ 422 if (error == -1) { \ 423 error = EINVAL; /* XXX: E2BIG? */ \ 424 break; \ 425 } \ 426 claimed = 0; \ 427 MAC_CHECK(externalize_ ## type, label, element_name, \ 428 &sb, &claimed); \ 429 if (error) \ 430 break; \ 431 if (claimed == 0 && ignorenotfound) { \ 432 /* Revert last label name. */ \ 433 sbuf_setpos(&sb, savedlen); \ 434 } else if (claimed != 1) { \ 435 error = EINVAL; /* XXX: ENOLABEL? */ \ 436 break; \ 437 } \ 438 } \ 439 sbuf_finish(&sb); \ 440} while (0) 441 442#define MAC_INTERNALIZE(type, label, instring) do { \ 443 char *element, *element_name, *element_data; \ 444 int claimed; \ 445 \ 446 error = 0; \ 447 element = instring; \ 448 while ((element_name = strsep(&element, ",")) != NULL) { \ 449 element_data = element_name; \ 450 element_name = strsep(&element_data, "/"); \ 451 if (element_data == NULL) { \ 452 error = EINVAL; \ 453 break; \ 454 } \ 455 claimed = 0; \ 456 MAC_CHECK(internalize_ ## type, label, element_name, \ 457 element_data, &claimed); \ 458 if (error) \ 459 break; \ 460 if (claimed != 1) { \ 461 /* XXXMAC: Another error here? */ \ 462 error = EINVAL; \ 463 break; \ 464 } \ 465 } \ 466} while (0) 467 468/* 469 * MAC_PERFORM performs the designated operation by walking the policy 470 * module list and invoking that operation for each policy. 471 */ 472#define MAC_PERFORM(operation, args...) do { \ 473 struct mac_policy_conf *mpc; \ 474 int entrycount; \ 475 \ 476 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 477 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 478 mpc->mpc_ops->mpo_ ## operation (args); \ 479 } \ 480 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 481 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 482 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 483 mpc->mpc_ops->mpo_ ## operation (args); \ 484 } \ 485 mac_policy_list_unbusy(); \ 486 } \ 487} while (0) 488 489/* 490 * Initialize the MAC subsystem, including appropriate SMP locks. 491 */ 492static void 493mac_init(void) 494{ 495 496 LIST_INIT(&mac_static_policy_list); 497 LIST_INIT(&mac_policy_list); 498 499 mtx_init(&mac_policy_mtx, "mac_policy_mtx", NULL, MTX_DEF); 500 cv_init(&mac_policy_cv, "mac_policy_cv"); 501} 502 503/* 504 * For the purposes of modules that want to know if they were loaded 505 * "early", set the mac_late flag once we've processed modules either 506 * linked into the kernel, or loaded before the kernel startup. 507 */ 508static void 509mac_late_init(void) 510{ 511 512 mac_late = 1; 513} 514 515/* 516 * After the policy list has changed, walk the list to update any global 517 * flags. 518 */ 519static void 520mac_policy_updateflags(void) 521{ 522 struct mac_policy_conf *tmpc; 523#ifndef MAC_ALWAYS_LABEL_MBUF 524 int labelmbufs; 525#endif 526 527 mac_policy_assert_exclusive(); 528 529#ifndef MAC_ALWAYS_LABEL_MBUF 530 labelmbufs = 0; 531#endif 532 533 LIST_FOREACH(tmpc, &mac_static_policy_list, mpc_list) { 534#ifndef MAC_ALWAYS_LABEL_MBUF 535 if (tmpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_LABELMBUFS) 536 labelmbufs++; 537#endif 538 } 539 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { 540#ifndef MAC_ALWAYS_LABEL_MBUF 541 if (tmpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_LABELMBUFS) 542 labelmbufs++; 543#endif 544 } 545 546#ifndef MAC_ALWAYS_LABEL_MBUF 547 mac_labelmbufs = (labelmbufs != 0); 548#endif 549} 550 551/* 552 * Allow MAC policy modules to register during boot, etc. 553 */ 554int 555mac_policy_modevent(module_t mod, int type, void *data) 556{ 557 struct mac_policy_conf *mpc; 558 int error; 559 560 error = 0; 561 mpc = (struct mac_policy_conf *) data; 562 563 switch (type) { 564 case MOD_LOAD: 565 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE && 566 mac_late) { 567 printf("mac_policy_modevent: can't load %s policy " 568 "after booting\n", mpc->mpc_name); 569 error = EBUSY; 570 break; 571 } 572 error = mac_policy_register(mpc); 573 break; 574 case MOD_UNLOAD: 575 /* Don't unregister the module if it was never registered. */ 576 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) 577 != 0) 578 error = mac_policy_unregister(mpc); 579 else 580 error = 0; 581 break; 582 default: 583 break; 584 } 585 586 return (error); 587} 588 589static int 590mac_policy_register(struct mac_policy_conf *mpc) 591{ 592 struct mac_policy_conf *tmpc; 593 int error, slot, static_entry; 594 595 error = 0; 596 597 /* 598 * We don't technically need exclusive access while !mac_late, 599 * but hold it for assertion consistency. 600 */ 601 mac_policy_grab_exclusive(); 602 603 /* 604 * If the module can potentially be unloaded, or we're loading 605 * late, we have to stick it in the non-static list and pay 606 * an extra performance overhead. Otherwise, we can pay a 607 * light locking cost and stick it in the static list. 608 */ 609 static_entry = (!mac_late && 610 !(mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK)); 611 612 if (static_entry) { 613 LIST_FOREACH(tmpc, &mac_static_policy_list, mpc_list) { 614 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { 615 error = EEXIST; 616 goto out; 617 } 618 } 619 } else { 620 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { 621 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { 622 error = EEXIST; 623 goto out; 624 } 625 } 626 } 627 if (mpc->mpc_field_off != NULL) { 628 slot = ffs(mac_slot_offsets_free); 629 if (slot == 0) { 630 error = ENOMEM; 631 goto out; 632 } 633 slot--; 634 mac_slot_offsets_free &= ~(1 << slot); 635 *mpc->mpc_field_off = slot; 636 } 637 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED; 638 639 /* 640 * If we're loading a MAC module after the framework has 641 * initialized, it has to go into the dynamic list. If 642 * we're loading it before we've finished initializing, 643 * it can go into the static list with weaker locker 644 * requirements. 645 */ 646 if (static_entry) 647 LIST_INSERT_HEAD(&mac_static_policy_list, mpc, mpc_list); 648 else 649 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list); 650 651 /* Per-policy initialization. */ 652 if (mpc->mpc_ops->mpo_init != NULL) 653 (*(mpc->mpc_ops->mpo_init))(mpc); 654 mac_policy_updateflags(); 655 656 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname, 657 mpc->mpc_name); 658 659out: 660 mac_policy_release_exclusive(); 661 return (error); 662} 663 664static int 665mac_policy_unregister(struct mac_policy_conf *mpc) 666{ 667 668 /* 669 * If we fail the load, we may get a request to unload. Check 670 * to see if we did the run-time registration, and if not, 671 * silently succeed. 672 */ 673 mac_policy_grab_exclusive(); 674 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) { 675 mac_policy_release_exclusive(); 676 return (0); 677 } 678#if 0 679 /* 680 * Don't allow unloading modules with private data. 681 */ 682 if (mpc->mpc_field_off != NULL) { 683 MAC_POLICY_LIST_UNLOCK(); 684 return (EBUSY); 685 } 686#endif 687 /* 688 * Only allow the unload to proceed if the module is unloadable 689 * by its own definition. 690 */ 691 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) { 692 mac_policy_release_exclusive(); 693 return (EBUSY); 694 } 695 if (mpc->mpc_ops->mpo_destroy != NULL) 696 (*(mpc->mpc_ops->mpo_destroy))(mpc); 697 698 LIST_REMOVE(mpc, mpc_list); 699 mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED; 700 mac_policy_updateflags(); 701 702 mac_policy_release_exclusive(); 703 704 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname, 705 mpc->mpc_name); 706 707 return (0); 708} 709 710/* 711 * Define an error value precedence, and given two arguments, selects the 712 * value with the higher precedence. 713 */ 714static int 715error_select(int error1, int error2) 716{ 717 718 /* Certain decision-making errors take top priority. */ 719 if (error1 == EDEADLK || error2 == EDEADLK) 720 return (EDEADLK); 721 722 /* Invalid arguments should be reported where possible. */ 723 if (error1 == EINVAL || error2 == EINVAL) 724 return (EINVAL); 725 726 /* Precedence goes to "visibility", with both process and file. */ 727 if (error1 == ESRCH || error2 == ESRCH) 728 return (ESRCH); 729 730 if (error1 == ENOENT || error2 == ENOENT) 731 return (ENOENT); 732 733 /* Precedence goes to DAC/MAC protections. */ 734 if (error1 == EACCES || error2 == EACCES) 735 return (EACCES); 736 737 /* Precedence goes to privilege. */ 738 if (error1 == EPERM || error2 == EPERM) 739 return (EPERM); 740 741 /* Precedence goes to error over success; otherwise, arbitrary. */ 742 if (error1 != 0) 743 return (error1); 744 return (error2); 745} 746 747static struct label * 748mbuf_to_label(struct mbuf *mbuf) 749{ 750 struct m_tag *tag; 751 struct label *label; 752 753 tag = m_tag_find(mbuf, PACKET_TAG_MACLABEL, NULL); 754 label = (struct label *)(tag+1); 755 756 return (label); 757} 758 759static void 760mac_init_label(struct label *label) 761{ 762 763 bzero(label, sizeof(*label)); 764 label->l_flags = MAC_FLAG_INITIALIZED; 765} 766 767static void 768mac_destroy_label(struct label *label) 769{ 770 771 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED, 772 ("destroying uninitialized label")); 773 774 bzero(label, sizeof(*label)); 775 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */ 776} 777 778void 779mac_init_bpfdesc(struct bpf_d *bpf_d) 780{ 781 782 mac_init_label(&bpf_d->bd_label); 783 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label); 784#ifdef MAC_DEBUG 785 atomic_add_int(&nmacbpfdescs, 1); 786#endif 787} 788 789static void 790mac_init_cred_label(struct label *label) 791{ 792 793 mac_init_label(label); 794 MAC_PERFORM(init_cred_label, label); 795#ifdef MAC_DEBUG 796 atomic_add_int(&nmaccreds, 1); 797#endif 798} 799 800void 801mac_init_cred(struct ucred *cred) 802{ 803 804 mac_init_cred_label(&cred->cr_label); 805} 806 807void 808mac_init_devfsdirent(struct devfs_dirent *de) 809{ 810 811 mac_init_label(&de->de_label); 812 MAC_PERFORM(init_devfsdirent_label, &de->de_label); 813#ifdef MAC_DEBUG 814 atomic_add_int(&nmacdevfsdirents, 1); 815#endif 816} 817 818static void 819mac_init_ifnet_label(struct label *label) 820{ 821 822 mac_init_label(label); 823 MAC_PERFORM(init_ifnet_label, label); 824#ifdef MAC_DEBUG 825 atomic_add_int(&nmacifnets, 1); 826#endif 827} 828 829void 830mac_init_ifnet(struct ifnet *ifp) 831{ 832 833 mac_init_ifnet_label(&ifp->if_label); 834} 835 836int 837mac_init_ipq(struct ipq *ipq, int flag) 838{ 839 int error; 840 841 mac_init_label(&ipq->ipq_label); 842 843 MAC_CHECK(init_ipq_label, &ipq->ipq_label, flag); 844 if (error) { 845 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label); 846 mac_destroy_label(&ipq->ipq_label); 847 } 848#ifdef MAC_DEBUG 849 if (error == 0) 850 atomic_add_int(&nmacipqs, 1); 851#endif 852 return (error); 853} 854 855int 856mac_init_mbuf_tag(struct m_tag *tag, int flag) 857{ 858 struct label *label; 859 int error; 860 861 label = (struct label *) (tag + 1); 862 mac_init_label(label); 863 864 MAC_CHECK(init_mbuf_label, label, flag); 865 if (error) { 866 MAC_PERFORM(destroy_mbuf_label, label); 867 mac_destroy_label(label); 868 } 869#ifdef MAC_DEBUG 870 if (error == 0) 871 atomic_add_int(&nmacmbufs, 1); 872#endif 873 return (error); 874} 875 876int 877mac_init_mbuf(struct mbuf *m, int flag) 878{ 879 struct m_tag *tag; 880 int error; 881 882 M_ASSERTPKTHDR(m); 883 884#ifndef MAC_ALWAYS_LABEL_MBUF 885 /* 886 * Don't reserve space for labels on mbufs unless we have a policy 887 * that uses the labels. 888 */ 889 if (mac_labelmbufs) { 890#endif 891 tag = m_tag_get(PACKET_TAG_MACLABEL, sizeof(struct label), 892 flag); 893 if (tag == NULL) 894 return (ENOMEM); 895 error = mac_init_mbuf_tag(tag, flag); 896 if (error) { 897 m_tag_free(tag); 898 return (error); 899 } 900 m_tag_prepend(m, tag); 901#ifndef MAC_ALWAYS_LABEL_MBUF 902 } 903#endif 904 return (0); 905} 906 907void 908mac_init_mount(struct mount *mp) 909{ 910 911 mac_init_label(&mp->mnt_mntlabel); 912 mac_init_label(&mp->mnt_fslabel); 913 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel); 914 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel); 915#ifdef MAC_DEBUG 916 atomic_add_int(&nmacmounts, 1); 917#endif 918} 919 920static void 921mac_init_pipe_label(struct label *label) 922{ 923 924 mac_init_label(label); 925 MAC_PERFORM(init_pipe_label, label); 926#ifdef MAC_DEBUG 927 atomic_add_int(&nmacpipes, 1); 928#endif 929} 930 931void 932mac_init_pipe(struct pipe *pipe) 933{ 934 struct label *label; 935 936 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK); 937 pipe->pipe_label = label; 938 pipe->pipe_peer->pipe_label = label; 939 mac_init_pipe_label(label); 940} 941 942void 943mac_init_proc(struct proc *p) 944{ 945 946 mac_init_label(&p->p_label); 947 MAC_PERFORM(init_proc_label, &p->p_label); 948#ifdef MAC_DEBUG 949 atomic_add_int(&nmacprocs, 1); 950#endif 951} 952 953static int 954mac_init_socket_label(struct label *label, int flag) 955{ 956 int error; 957 958 mac_init_label(label); 959 960 MAC_CHECK(init_socket_label, label, flag); 961 if (error) { 962 MAC_PERFORM(destroy_socket_label, label); 963 mac_destroy_label(label); 964 } 965 966#ifdef MAC_DEBUG 967 if (error == 0) 968 atomic_add_int(&nmacsockets, 1); 969#endif 970 971 return (error); 972} 973 974static int 975mac_init_socket_peer_label(struct label *label, int flag) 976{ 977 int error; 978 979 mac_init_label(label); 980 981 MAC_CHECK(init_socket_peer_label, label, flag); 982 if (error) { 983 MAC_PERFORM(destroy_socket_label, label); 984 mac_destroy_label(label); 985 } 986 987 return (error); 988} 989 990int 991mac_init_socket(struct socket *socket, int flag) 992{ 993 int error; 994 995 error = mac_init_socket_label(&socket->so_label, flag); 996 if (error) 997 return (error); 998 999 error = mac_init_socket_peer_label(&socket->so_peerlabel, flag); 1000 if (error) 1001 mac_destroy_socket_label(&socket->so_label); 1002 1003 return (error); 1004} 1005 1006void 1007mac_init_vnode_label(struct label *label) 1008{ 1009 1010 mac_init_label(label); 1011 MAC_PERFORM(init_vnode_label, label); 1012#ifdef MAC_DEBUG 1013 atomic_add_int(&nmacvnodes, 1); 1014#endif 1015} 1016 1017void 1018mac_init_vnode(struct vnode *vp) 1019{ 1020 1021 mac_init_vnode_label(&vp->v_label); 1022} 1023 1024void 1025mac_destroy_bpfdesc(struct bpf_d *bpf_d) 1026{ 1027 1028 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label); 1029 mac_destroy_label(&bpf_d->bd_label); 1030#ifdef MAC_DEBUG 1031 atomic_subtract_int(&nmacbpfdescs, 1); 1032#endif 1033} 1034 1035static void 1036mac_destroy_cred_label(struct label *label) 1037{ 1038 1039 MAC_PERFORM(destroy_cred_label, label); 1040 mac_destroy_label(label); 1041#ifdef MAC_DEBUG 1042 atomic_subtract_int(&nmaccreds, 1); 1043#endif 1044} 1045 1046void 1047mac_destroy_cred(struct ucred *cred) 1048{ 1049 1050 mac_destroy_cred_label(&cred->cr_label); 1051} 1052 1053void 1054mac_destroy_devfsdirent(struct devfs_dirent *de) 1055{ 1056 1057 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label); 1058 mac_destroy_label(&de->de_label); 1059#ifdef MAC_DEBUG 1060 atomic_subtract_int(&nmacdevfsdirents, 1); 1061#endif 1062} 1063 1064static void 1065mac_destroy_ifnet_label(struct label *label) 1066{ 1067 1068 MAC_PERFORM(destroy_ifnet_label, label); 1069 mac_destroy_label(label); 1070#ifdef MAC_DEBUG 1071 atomic_subtract_int(&nmacifnets, 1); 1072#endif 1073} 1074 1075void 1076mac_destroy_ifnet(struct ifnet *ifp) 1077{ 1078 1079 mac_destroy_ifnet_label(&ifp->if_label); 1080} 1081 1082void 1083mac_destroy_ipq(struct ipq *ipq) 1084{ 1085 1086 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label); 1087 mac_destroy_label(&ipq->ipq_label); 1088#ifdef MAC_DEBUG 1089 atomic_subtract_int(&nmacipqs, 1); 1090#endif 1091} 1092 1093void 1094mac_destroy_mbuf_tag(struct m_tag *tag) 1095{ 1096 struct label *label; 1097 1098 label = (struct label *)(tag+1); 1099 1100 MAC_PERFORM(destroy_mbuf_label, label); 1101 mac_destroy_label(label); 1102#ifdef MAC_DEBUG 1103 atomic_subtract_int(&nmacmbufs, 1); 1104#endif 1105} 1106 1107void 1108mac_destroy_mount(struct mount *mp) 1109{ 1110 1111 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel); 1112 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel); 1113 mac_destroy_label(&mp->mnt_fslabel); 1114 mac_destroy_label(&mp->mnt_mntlabel); 1115#ifdef MAC_DEBUG 1116 atomic_subtract_int(&nmacmounts, 1); 1117#endif 1118} 1119 1120static void 1121mac_destroy_pipe_label(struct label *label) 1122{ 1123 1124 MAC_PERFORM(destroy_pipe_label, label); 1125 mac_destroy_label(label); 1126#ifdef MAC_DEBUG 1127 atomic_subtract_int(&nmacpipes, 1); 1128#endif 1129} 1130 1131void 1132mac_destroy_pipe(struct pipe *pipe) 1133{ 1134 1135 mac_destroy_pipe_label(pipe->pipe_label); 1136 free(pipe->pipe_label, M_MACPIPELABEL); 1137} 1138 1139void 1140mac_destroy_proc(struct proc *p) 1141{ 1142 1143 MAC_PERFORM(destroy_proc_label, &p->p_label); 1144 mac_destroy_label(&p->p_label); 1145#ifdef MAC_DEBUG 1146 atomic_subtract_int(&nmacprocs, 1); 1147#endif 1148} 1149 1150static void 1151mac_destroy_socket_label(struct label *label) 1152{ 1153 1154 MAC_PERFORM(destroy_socket_label, label); 1155 mac_destroy_label(label); 1156#ifdef MAC_DEBUG 1157 atomic_subtract_int(&nmacsockets, 1); 1158#endif 1159} 1160 1161static void 1162mac_destroy_socket_peer_label(struct label *label) 1163{ 1164 1165 MAC_PERFORM(destroy_socket_peer_label, label); 1166 mac_destroy_label(label); 1167} 1168 1169void 1170mac_destroy_socket(struct socket *socket) 1171{ 1172 1173 mac_destroy_socket_label(&socket->so_label); 1174 mac_destroy_socket_peer_label(&socket->so_peerlabel); 1175} 1176 1177void 1178mac_destroy_vnode_label(struct label *label) 1179{ 1180 1181 MAC_PERFORM(destroy_vnode_label, label); 1182 mac_destroy_label(label); 1183#ifdef MAC_DEBUG 1184 atomic_subtract_int(&nmacvnodes, 1); 1185#endif 1186} 1187 1188void 1189mac_destroy_vnode(struct vnode *vp) 1190{ 1191 1192 mac_destroy_vnode_label(&vp->v_label); 1193} 1194 1195void 1196mac_copy_mbuf_tag(struct m_tag *src, struct m_tag *dest) 1197{ 1198 struct label *src_label, *dest_label; 1199 1200 src_label = (struct label *)(src+1); 1201 dest_label = (struct label *)(dest+1); 1202 1203 /* 1204 * mac_init_mbuf_tag() is called on the target tag in 1205 * m_tag_copy(), so we don't need to call it here. 1206 */ 1207 MAC_PERFORM(copy_mbuf_label, src_label, dest_label); 1208} 1209 1210static void 1211mac_copy_pipe_label(struct label *src, struct label *dest) 1212{ 1213 1214 MAC_PERFORM(copy_pipe_label, src, dest); 1215} 1216 1217void 1218mac_copy_vnode_label(struct label *src, struct label *dest) 1219{ 1220 1221 MAC_PERFORM(copy_vnode_label, src, dest); 1222} 1223 1224static int 1225mac_check_structmac_consistent(struct mac *mac) 1226{ 1227 1228 if (mac->m_buflen > MAC_MAX_LABEL_BUF_LEN) 1229 return (EINVAL); 1230 1231 return (0); 1232} 1233 1234static int 1235mac_externalize_cred_label(struct label *label, char *elements, 1236 char *outbuf, size_t outbuflen, int flags) 1237{ 1238 int error; 1239 1240 MAC_EXTERNALIZE(cred_label, label, elements, outbuf, outbuflen); 1241 1242 return (error); 1243} 1244 1245static int 1246mac_externalize_ifnet_label(struct label *label, char *elements, 1247 char *outbuf, size_t outbuflen, int flags) 1248{ 1249 int error; 1250 1251 MAC_EXTERNALIZE(ifnet_label, label, elements, outbuf, outbuflen); 1252 1253 return (error); 1254} 1255 1256static int 1257mac_externalize_pipe_label(struct label *label, char *elements, 1258 char *outbuf, size_t outbuflen, int flags) 1259{ 1260 int error; 1261 1262 MAC_EXTERNALIZE(pipe_label, label, elements, outbuf, outbuflen); 1263 1264 return (error); 1265} 1266 1267static int 1268mac_externalize_socket_label(struct label *label, char *elements, 1269 char *outbuf, size_t outbuflen, int flags) 1270{ 1271 int error; 1272 1273 MAC_EXTERNALIZE(socket_label, label, elements, outbuf, outbuflen); 1274 1275 return (error); 1276} 1277 1278static int 1279mac_externalize_socket_peer_label(struct label *label, char *elements, 1280 char *outbuf, size_t outbuflen, int flags) 1281{ 1282 int error; 1283 1284 MAC_EXTERNALIZE(socket_peer_label, label, elements, outbuf, outbuflen); 1285 1286 return (error); 1287} 1288 1289static int 1290mac_externalize_vnode_label(struct label *label, char *elements, 1291 char *outbuf, size_t outbuflen, int flags) 1292{ 1293 int error; 1294 1295 MAC_EXTERNALIZE(vnode_label, label, elements, outbuf, outbuflen); 1296 1297 return (error); 1298} 1299 1300static int 1301mac_internalize_cred_label(struct label *label, char *string) 1302{ 1303 int error; 1304 1305 MAC_INTERNALIZE(cred_label, label, string); 1306 1307 return (error); 1308} 1309 1310static int 1311mac_internalize_ifnet_label(struct label *label, char *string) 1312{ 1313 int error; 1314 1315 MAC_INTERNALIZE(ifnet_label, label, string); 1316 1317 return (error); 1318} 1319 1320static int 1321mac_internalize_pipe_label(struct label *label, char *string) 1322{ 1323 int error; 1324 1325 MAC_INTERNALIZE(pipe_label, label, string); 1326 1327 return (error); 1328} 1329 1330static int 1331mac_internalize_socket_label(struct label *label, char *string) 1332{ 1333 int error; 1334 1335 MAC_INTERNALIZE(socket_label, label, string); 1336 1337 return (error); 1338} 1339 1340static int 1341mac_internalize_vnode_label(struct label *label, char *string) 1342{ 1343 int error; 1344 1345 MAC_INTERNALIZE(vnode_label, label, string); 1346 1347 return (error); 1348} 1349 1350/* 1351 * Initialize MAC label for the first kernel process, from which other 1352 * kernel processes and threads are spawned. 1353 */ 1354void 1355mac_create_proc0(struct ucred *cred) 1356{ 1357 1358 MAC_PERFORM(create_proc0, cred); 1359} 1360 1361/* 1362 * Initialize MAC label for the first userland process, from which other 1363 * userland processes and threads are spawned. 1364 */ 1365void 1366mac_create_proc1(struct ucred *cred) 1367{ 1368 1369 MAC_PERFORM(create_proc1, cred); 1370} 1371 1372void 1373mac_thread_userret(struct thread *td) 1374{ 1375 1376 MAC_PERFORM(thread_userret, td); 1377} 1378 1379/* 1380 * When a new process is created, its label must be initialized. Generally, 1381 * this involves inheritence from the parent process, modulo possible 1382 * deltas. This function allows that processing to take place. 1383 */ 1384void 1385mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred) 1386{ 1387 1388 MAC_PERFORM(create_cred, parent_cred, child_cred); 1389} 1390 1391void 1392mac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de, 1393 struct vnode *vp) 1394{ 1395 1396 MAC_PERFORM(update_devfsdirent, mp, de, &de->de_label, vp, 1397 &vp->v_label); 1398} 1399 1400void 1401mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de, 1402 struct vnode *vp) 1403{ 1404 1405 MAC_PERFORM(associate_vnode_devfs, mp, &mp->mnt_fslabel, de, 1406 &de->de_label, vp, &vp->v_label); 1407} 1408 1409int 1410mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp) 1411{ 1412 int error; 1413 1414 ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr"); 1415 1416 MAC_CHECK(associate_vnode_extattr, mp, &mp->mnt_fslabel, vp, 1417 &vp->v_label); 1418 1419 return (error); 1420} 1421 1422void 1423mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp) 1424{ 1425 1426 MAC_PERFORM(associate_vnode_singlelabel, mp, &mp->mnt_fslabel, vp, 1427 &vp->v_label); 1428} 1429 1430int 1431mac_create_vnode_extattr(struct ucred *cred, struct mount *mp, 1432 struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 1433{ 1434 int error; 1435 1436 ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr"); 1437 ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr"); 1438 1439 error = VOP_OPENEXTATTR(vp, cred, curthread); 1440 if (error == EOPNOTSUPP) { 1441 /* XXX: Optionally abort if transactions not supported. */ 1442 if (ea_warn_once == 0) { 1443 printf("Warning: transactions not supported " 1444 "in EA write.\n"); 1445 ea_warn_once = 1; 1446 } 1447 } else if (error) 1448 return (error); 1449 1450 MAC_CHECK(create_vnode_extattr, cred, mp, &mp->mnt_fslabel, 1451 dvp, &dvp->v_label, vp, &vp->v_label, cnp); 1452 1453 if (error) { 1454 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 1455 return (error); 1456 } 1457 1458 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 1459 1460 if (error == EOPNOTSUPP) 1461 error = 0; /* XXX */ 1462 1463 return (error); 1464} 1465 1466static int 1467mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 1468 struct label *intlabel) 1469{ 1470 int error; 1471 1472 ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr"); 1473 1474 error = VOP_OPENEXTATTR(vp, cred, curthread); 1475 if (error == EOPNOTSUPP) { 1476 /* XXX: Optionally abort if transactions not supported. */ 1477 if (ea_warn_once == 0) { 1478 printf("Warning: transactions not supported " 1479 "in EA write.\n"); 1480 ea_warn_once = 1; 1481 } 1482 } else if (error) 1483 return (error); 1484 1485 MAC_CHECK(setlabel_vnode_extattr, cred, vp, &vp->v_label, intlabel); 1486 1487 if (error) { 1488 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 1489 return (error); 1490 } 1491 1492 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 1493 1494 if (error == EOPNOTSUPP) 1495 error = 0; /* XXX */ 1496 1497 return (error); 1498} 1499 1500int 1501mac_execve_enter(struct image_params *imgp, struct mac *mac_p, 1502 struct label *execlabelstorage) 1503{ 1504 struct mac mac; 1505 char *buffer; 1506 int error; 1507 1508 if (mac_p == NULL) 1509 return (0); 1510 1511 error = copyin(mac_p, &mac, sizeof(mac)); 1512 if (error) 1513 return (error); 1514 1515 error = mac_check_structmac_consistent(&mac); 1516 if (error) 1517 return (error); 1518 1519 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 1520 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 1521 if (error) { 1522 free(buffer, M_MACTEMP); 1523 return (error); 1524 } 1525 1526 mac_init_cred_label(execlabelstorage); 1527 error = mac_internalize_cred_label(execlabelstorage, buffer); 1528 free(buffer, M_MACTEMP); 1529 if (error) { 1530 mac_destroy_cred_label(execlabelstorage); 1531 return (error); 1532 } 1533 imgp->execlabel = execlabelstorage; 1534 return (0); 1535} 1536 1537void 1538mac_execve_exit(struct image_params *imgp) 1539{ 1540 if (imgp->execlabel != NULL) 1541 mac_destroy_cred_label(imgp->execlabel); 1542} 1543 1544void 1545mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, 1546 struct label *interpvnodelabel, struct image_params *imgp) 1547{ 1548 1549 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 1550 1551 if (!mac_enforce_process && !mac_enforce_fs) 1552 return; 1553 1554 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label, 1555 interpvnodelabel, imgp, imgp->execlabel); 1556} 1557 1558int 1559mac_execve_will_transition(struct ucred *old, struct vnode *vp, 1560 struct label *interpvnodelabel, struct image_params *imgp) 1561{ 1562 int result; 1563 1564 ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition"); 1565 1566 if (!mac_enforce_process && !mac_enforce_fs) 1567 return (0); 1568 1569 result = 0; 1570 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label, 1571 interpvnodelabel, imgp, imgp->execlabel); 1572 1573 return (result); 1574} 1575 1576int 1577mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode) 1578{ 1579 int error; 1580 1581 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 1582 1583 if (!mac_enforce_fs) 1584 return (0); 1585 1586 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, acc_mode); 1587 return (error); 1588} 1589 1590int 1591mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 1592{ 1593 int error; 1594 1595 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 1596 1597 if (!mac_enforce_fs) 1598 return (0); 1599 1600 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label); 1601 return (error); 1602} 1603 1604int 1605mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 1606{ 1607 int error; 1608 1609 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 1610 1611 if (!mac_enforce_fs) 1612 return (0); 1613 1614 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label); 1615 return (error); 1616} 1617 1618int 1619mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1620 struct componentname *cnp, struct vattr *vap) 1621{ 1622 int error; 1623 1624 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 1625 1626 if (!mac_enforce_fs) 1627 return (0); 1628 1629 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap); 1630 return (error); 1631} 1632 1633int 1634mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 1635 struct componentname *cnp) 1636{ 1637 int error; 1638 1639 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 1640 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 1641 1642 if (!mac_enforce_fs) 1643 return (0); 1644 1645 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp, 1646 &vp->v_label, cnp); 1647 return (error); 1648} 1649 1650int 1651mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1652 acl_type_t type) 1653{ 1654 int error; 1655 1656 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 1657 1658 if (!mac_enforce_fs) 1659 return (0); 1660 1661 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type); 1662 return (error); 1663} 1664 1665int 1666mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 1667 struct image_params *imgp) 1668{ 1669 int error; 1670 1671 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 1672 1673 if (!mac_enforce_process && !mac_enforce_fs) 1674 return (0); 1675 1676 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label, imgp, 1677 imgp->execlabel); 1678 1679 return (error); 1680} 1681 1682int 1683mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 1684{ 1685 int error; 1686 1687 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 1688 1689 if (!mac_enforce_fs) 1690 return (0); 1691 1692 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); 1693 return (error); 1694} 1695 1696int 1697mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1698 int attrnamespace, const char *name, struct uio *uio) 1699{ 1700 int error; 1701 1702 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 1703 1704 if (!mac_enforce_fs) 1705 return (0); 1706 1707 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, 1708 attrnamespace, name, uio); 1709 return (error); 1710} 1711 1712int 1713mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 1714 struct vnode *vp, struct componentname *cnp) 1715{ 1716 int error; 1717 1718 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 1719 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 1720 1721 if (!mac_enforce_fs) 1722 return (0); 1723 1724 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp, 1725 &vp->v_label, cnp); 1726 return (error); 1727} 1728 1729int 1730mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 1731 struct componentname *cnp) 1732{ 1733 int error; 1734 1735 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 1736 1737 if (!mac_enforce_fs) 1738 return (0); 1739 1740 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); 1741 return (error); 1742} 1743 1744int 1745mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot) 1746{ 1747 int error; 1748 1749 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 1750 1751 if (!mac_enforce_fs || !mac_enforce_vm) 1752 return (0); 1753 1754 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot); 1755 return (error); 1756} 1757 1758void 1759mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 1760{ 1761 int result = *prot; 1762 1763 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 1764 1765 if (!mac_enforce_fs || !mac_enforce_vm) 1766 return; 1767 1768 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label, 1769 &result); 1770 1771 *prot = result; 1772} 1773 1774int 1775mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 1776{ 1777 int error; 1778 1779 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 1780 1781 if (!mac_enforce_fs || !mac_enforce_vm) 1782 return (0); 1783 1784 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot); 1785 return (error); 1786} 1787 1788int 1789mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 1790{ 1791 int error; 1792 1793 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 1794 1795 if (!mac_enforce_fs) 1796 return (0); 1797 1798 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); 1799 return (error); 1800} 1801 1802int 1803mac_check_vnode_poll(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_poll"); 1809 1810 if (!mac_enforce_fs) 1811 return (0); 1812 1813 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 1814 &vp->v_label); 1815 1816 return (error); 1817} 1818 1819int 1820mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 1821 struct vnode *vp) 1822{ 1823 int error; 1824 1825 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 1826 1827 if (!mac_enforce_fs) 1828 return (0); 1829 1830 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 1831 &vp->v_label); 1832 1833 return (error); 1834} 1835 1836int 1837mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 1838{ 1839 int error; 1840 1841 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 1842 1843 if (!mac_enforce_fs) 1844 return (0); 1845 1846 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); 1847 return (error); 1848} 1849 1850int 1851mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 1852{ 1853 int error; 1854 1855 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 1856 1857 if (!mac_enforce_fs) 1858 return (0); 1859 1860 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); 1861 return (error); 1862} 1863 1864static int 1865mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 1866 struct label *newlabel) 1867{ 1868 int error; 1869 1870 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 1871 1872 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); 1873 1874 return (error); 1875} 1876 1877int 1878mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 1879 struct vnode *vp, struct componentname *cnp) 1880{ 1881 int error; 1882 1883 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 1884 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 1885 1886 if (!mac_enforce_fs) 1887 return (0); 1888 1889 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, 1890 &vp->v_label, cnp); 1891 return (error); 1892} 1893 1894int 1895mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 1896 struct vnode *vp, int samedir, struct componentname *cnp) 1897{ 1898 int error; 1899 1900 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 1901 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 1902 1903 if (!mac_enforce_fs) 1904 return (0); 1905 1906 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, 1907 vp != NULL ? &vp->v_label : NULL, samedir, cnp); 1908 return (error); 1909} 1910 1911int 1912mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 1913{ 1914 int error; 1915 1916 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 1917 1918 if (!mac_enforce_fs) 1919 return (0); 1920 1921 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); 1922 return (error); 1923} 1924 1925int 1926mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 1927 struct acl *acl) 1928{ 1929 int error; 1930 1931 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 1932 1933 if (!mac_enforce_fs) 1934 return (0); 1935 1936 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); 1937 return (error); 1938} 1939 1940int 1941mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 1942 int attrnamespace, const char *name, struct uio *uio) 1943{ 1944 int error; 1945 1946 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 1947 1948 if (!mac_enforce_fs) 1949 return (0); 1950 1951 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, 1952 attrnamespace, name, uio); 1953 return (error); 1954} 1955 1956int 1957mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 1958{ 1959 int error; 1960 1961 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 1962 1963 if (!mac_enforce_fs) 1964 return (0); 1965 1966 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); 1967 return (error); 1968} 1969 1970int 1971mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 1972{ 1973 int error; 1974 1975 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 1976 1977 if (!mac_enforce_fs) 1978 return (0); 1979 1980 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); 1981 return (error); 1982} 1983 1984int 1985mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 1986 gid_t gid) 1987{ 1988 int error; 1989 1990 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 1991 1992 if (!mac_enforce_fs) 1993 return (0); 1994 1995 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); 1996 return (error); 1997} 1998 1999int 2000mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 2001 struct timespec atime, struct timespec mtime) 2002{ 2003 int error; 2004 2005 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 2006 2007 if (!mac_enforce_fs) 2008 return (0); 2009 2010 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, 2011 mtime); 2012 return (error); 2013} 2014 2015int 2016mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2017 struct vnode *vp) 2018{ 2019 int error; 2020 2021 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 2022 2023 if (!mac_enforce_fs) 2024 return (0); 2025 2026 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 2027 &vp->v_label); 2028 return (error); 2029} 2030 2031int 2032mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 2033 struct vnode *vp) 2034{ 2035 int error; 2036 2037 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 2038 2039 if (!mac_enforce_fs) 2040 return (0); 2041 2042 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 2043 &vp->v_label); 2044 2045 return (error); 2046} 2047 2048/* 2049 * When relabeling a process, call out to the policies for the maximum 2050 * permission allowed for each object type we know about in its 2051 * memory space, and revoke access (in the least surprising ways we 2052 * know) when necessary. The process lock is not held here. 2053 */ 2054void 2055mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) 2056{ 2057 2058 /* XXX freeze all other threads */ 2059 mac_cred_mmapped_drop_perms_recurse(td, cred, 2060 &td->td_proc->p_vmspace->vm_map); 2061 /* XXX allow other threads to continue */ 2062} 2063 2064static __inline const char * 2065prot2str(vm_prot_t prot) 2066{ 2067 2068 switch (prot & VM_PROT_ALL) { 2069 case VM_PROT_READ: 2070 return ("r--"); 2071 case VM_PROT_READ | VM_PROT_WRITE: 2072 return ("rw-"); 2073 case VM_PROT_READ | VM_PROT_EXECUTE: 2074 return ("r-x"); 2075 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 2076 return ("rwx"); 2077 case VM_PROT_WRITE: 2078 return ("-w-"); 2079 case VM_PROT_EXECUTE: 2080 return ("--x"); 2081 case VM_PROT_WRITE | VM_PROT_EXECUTE: 2082 return ("-wx"); 2083 default: 2084 return ("---"); 2085 } 2086} 2087 2088static void 2089mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, 2090 struct vm_map *map) 2091{ 2092 struct vm_map_entry *vme; 2093 int result; 2094 vm_prot_t revokeperms; 2095 vm_object_t object; 2096 vm_ooffset_t offset; 2097 struct vnode *vp; 2098 2099 if (!mac_mmap_revocation) 2100 return; 2101 2102 vm_map_lock_read(map); 2103 for (vme = map->header.next; vme != &map->header; vme = vme->next) { 2104 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { 2105 mac_cred_mmapped_drop_perms_recurse(td, cred, 2106 vme->object.sub_map); 2107 continue; 2108 } 2109 /* 2110 * Skip over entries that obviously are not shared. 2111 */ 2112 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || 2113 !vme->max_protection) 2114 continue; 2115 /* 2116 * Drill down to the deepest backing object. 2117 */ 2118 offset = vme->offset; 2119 object = vme->object.vm_object; 2120 if (object == NULL) 2121 continue; 2122 while (object->backing_object != NULL) { 2123 object = object->backing_object; 2124 offset += object->backing_object_offset; 2125 } 2126 /* 2127 * At the moment, vm_maps and objects aren't considered 2128 * by the MAC system, so only things with backing by a 2129 * normal object (read: vnodes) are checked. 2130 */ 2131 if (object->type != OBJT_VNODE) 2132 continue; 2133 vp = (struct vnode *)object->handle; 2134 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2135 result = vme->max_protection; 2136 mac_check_vnode_mmap_downgrade(cred, vp, &result); 2137 VOP_UNLOCK(vp, 0, td); 2138 /* 2139 * Find out what maximum protection we may be allowing 2140 * now but a policy needs to get removed. 2141 */ 2142 revokeperms = vme->max_protection & ~result; 2143 if (!revokeperms) 2144 continue; 2145 printf("pid %ld: revoking %s perms from %#lx:%ld " 2146 "(max %s/cur %s)\n", (long)td->td_proc->p_pid, 2147 prot2str(revokeperms), (u_long)vme->start, 2148 (long)(vme->end - vme->start), 2149 prot2str(vme->max_protection), prot2str(vme->protection)); 2150 vm_map_lock_upgrade(map); 2151 /* 2152 * This is the really simple case: if a map has more 2153 * max_protection than is allowed, but it's not being 2154 * actually used (that is, the current protection is 2155 * still allowed), we can just wipe it out and do 2156 * nothing more. 2157 */ 2158 if ((vme->protection & revokeperms) == 0) { 2159 vme->max_protection -= revokeperms; 2160 } else { 2161 if (revokeperms & VM_PROT_WRITE) { 2162 /* 2163 * In the more complicated case, flush out all 2164 * pending changes to the object then turn it 2165 * copy-on-write. 2166 */ 2167 vm_object_reference(object); 2168 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2169 VM_OBJECT_LOCK(object); 2170 vm_object_page_clean(object, 2171 OFF_TO_IDX(offset), 2172 OFF_TO_IDX(offset + vme->end - vme->start + 2173 PAGE_MASK), 2174 OBJPC_SYNC); 2175 VM_OBJECT_UNLOCK(object); 2176 VOP_UNLOCK(vp, 0, td); 2177 vm_object_deallocate(object); 2178 /* 2179 * Why bother if there's no read permissions 2180 * anymore? For the rest, we need to leave 2181 * the write permissions on for COW, or 2182 * remove them entirely if configured to. 2183 */ 2184 if (!mac_mmap_revocation_via_cow) { 2185 vme->max_protection &= ~VM_PROT_WRITE; 2186 vme->protection &= ~VM_PROT_WRITE; 2187 } if ((revokeperms & VM_PROT_READ) == 0) 2188 vme->eflags |= MAP_ENTRY_COW | 2189 MAP_ENTRY_NEEDS_COPY; 2190 } 2191 if (revokeperms & VM_PROT_EXECUTE) { 2192 vme->max_protection &= ~VM_PROT_EXECUTE; 2193 vme->protection &= ~VM_PROT_EXECUTE; 2194 } 2195 if (revokeperms & VM_PROT_READ) { 2196 vme->max_protection = 0; 2197 vme->protection = 0; 2198 } 2199 pmap_protect(map->pmap, vme->start, vme->end, 2200 vme->protection & ~revokeperms); 2201 vm_map_simplify_entry(map, vme); 2202 } 2203 vm_map_lock_downgrade(map); 2204 } 2205 vm_map_unlock_read(map); 2206} 2207 2208/* 2209 * When the subject's label changes, it may require revocation of privilege 2210 * to mapped objects. This can't be done on-the-fly later with a unified 2211 * buffer cache. 2212 */ 2213static void 2214mac_relabel_cred(struct ucred *cred, struct label *newlabel) 2215{ 2216 2217 MAC_PERFORM(relabel_cred, cred, newlabel); 2218} 2219 2220void 2221mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 2222{ 2223 2224 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); 2225} 2226 2227void 2228mac_create_ifnet(struct ifnet *ifnet) 2229{ 2230 2231 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label); 2232} 2233 2234void 2235mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d) 2236{ 2237 2238 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label); 2239} 2240 2241void 2242mac_create_socket(struct ucred *cred, struct socket *socket) 2243{ 2244 2245 MAC_PERFORM(create_socket, cred, socket, &socket->so_label); 2246} 2247 2248void 2249mac_create_pipe(struct ucred *cred, struct pipe *pipe) 2250{ 2251 2252 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); 2253} 2254 2255void 2256mac_create_socket_from_socket(struct socket *oldsocket, 2257 struct socket *newsocket) 2258{ 2259 2260 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label, 2261 newsocket, &newsocket->so_label); 2262} 2263 2264static void 2265mac_relabel_socket(struct ucred *cred, struct socket *socket, 2266 struct label *newlabel) 2267{ 2268 2269 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); 2270} 2271 2272static void 2273mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) 2274{ 2275 2276 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); 2277} 2278 2279void 2280mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) 2281{ 2282 struct label *label; 2283 2284 label = mbuf_to_label(mbuf); 2285 2286 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, label, socket, 2287 &socket->so_peerlabel); 2288} 2289 2290void 2291mac_set_socket_peer_from_socket(struct socket *oldsocket, 2292 struct socket *newsocket) 2293{ 2294 2295 MAC_PERFORM(set_socket_peer_from_socket, oldsocket, 2296 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel); 2297} 2298 2299void 2300mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram) 2301{ 2302 struct label *label; 2303 2304 label = mbuf_to_label(datagram); 2305 2306 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label, 2307 datagram, label); 2308} 2309 2310void 2311mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment) 2312{ 2313 struct label *datagramlabel, *fragmentlabel; 2314 2315 datagramlabel = mbuf_to_label(datagram); 2316 fragmentlabel = mbuf_to_label(fragment); 2317 2318 MAC_PERFORM(create_fragment, datagram, datagramlabel, fragment, 2319 fragmentlabel); 2320} 2321 2322void 2323mac_create_ipq(struct mbuf *fragment, struct ipq *ipq) 2324{ 2325 struct label *label; 2326 2327 label = mbuf_to_label(fragment); 2328 2329 MAC_PERFORM(create_ipq, fragment, label, ipq, &ipq->ipq_label); 2330} 2331 2332void 2333mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2334{ 2335 struct label *oldmbuflabel, *newmbuflabel; 2336 2337 oldmbuflabel = mbuf_to_label(oldmbuf); 2338 newmbuflabel = mbuf_to_label(newmbuf); 2339 2340 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, oldmbuflabel, newmbuf, 2341 newmbuflabel); 2342} 2343 2344void 2345mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf) 2346{ 2347 struct label *label; 2348 2349 label = mbuf_to_label(mbuf); 2350 2351 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf, 2352 label); 2353} 2354 2355void 2356mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf) 2357{ 2358 struct label *label; 2359 2360 label = mbuf_to_label(mbuf); 2361 2362 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf, 2363 label); 2364} 2365 2366void 2367mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf) 2368{ 2369 struct label *label; 2370 2371 label = mbuf_to_label(mbuf); 2372 2373 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf, 2374 label); 2375} 2376 2377void 2378mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet, 2379 struct mbuf *newmbuf) 2380{ 2381 struct label *oldmbuflabel, *newmbuflabel; 2382 2383 oldmbuflabel = mbuf_to_label(oldmbuf); 2384 newmbuflabel = mbuf_to_label(newmbuf); 2385 2386 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, oldmbuflabel, 2387 ifnet, &ifnet->if_label, newmbuf, newmbuflabel); 2388} 2389 2390void 2391mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf) 2392{ 2393 struct label *oldmbuflabel, *newmbuflabel; 2394 2395 oldmbuflabel = mbuf_to_label(oldmbuf); 2396 newmbuflabel = mbuf_to_label(newmbuf); 2397 2398 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, oldmbuflabel, newmbuf, 2399 newmbuflabel); 2400} 2401 2402int 2403mac_fragment_match(struct mbuf *fragment, struct ipq *ipq) 2404{ 2405 struct label *label; 2406 int result; 2407 2408 label = mbuf_to_label(fragment); 2409 2410 result = 1; 2411 MAC_BOOLEAN(fragment_match, &&, fragment, label, ipq, 2412 &ipq->ipq_label); 2413 2414 return (result); 2415} 2416 2417void 2418mac_update_ipq(struct mbuf *fragment, struct ipq *ipq) 2419{ 2420 struct label *label; 2421 2422 label = mbuf_to_label(fragment); 2423 2424 MAC_PERFORM(update_ipq, fragment, label, ipq, &ipq->ipq_label); 2425} 2426 2427void 2428mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) 2429{ 2430 struct label *label; 2431 2432 label = mbuf_to_label(mbuf); 2433 2434 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf, 2435 label); 2436} 2437 2438void 2439mac_create_mount(struct ucred *cred, struct mount *mp) 2440{ 2441 2442 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, 2443 &mp->mnt_fslabel); 2444} 2445 2446void 2447mac_create_root_mount(struct ucred *cred, struct mount *mp) 2448{ 2449 2450 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, 2451 &mp->mnt_fslabel); 2452} 2453 2454int 2455mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) 2456{ 2457 int error; 2458 2459 if (!mac_enforce_network) 2460 return (0); 2461 2462 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet, 2463 &ifnet->if_label); 2464 2465 return (error); 2466} 2467 2468static int 2469mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) 2470{ 2471 int error; 2472 2473 MAC_CHECK(check_cred_relabel, cred, newlabel); 2474 2475 return (error); 2476} 2477 2478int 2479mac_check_cred_visible(struct ucred *u1, struct ucred *u2) 2480{ 2481 int error; 2482 2483 if (!mac_enforce_process) 2484 return (0); 2485 2486 MAC_CHECK(check_cred_visible, u1, u2); 2487 2488 return (error); 2489} 2490 2491int 2492mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) 2493{ 2494 struct label *label; 2495 int error; 2496 2497 M_ASSERTPKTHDR(mbuf); 2498 2499 if (!mac_enforce_network) 2500 return (0); 2501 2502 label = mbuf_to_label(mbuf); 2503 2504 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf, 2505 label); 2506 2507 return (error); 2508} 2509 2510int 2511mac_check_kenv_dump(struct ucred *cred) 2512{ 2513 int error; 2514 2515 if (!mac_enforce_system) 2516 return (0); 2517 2518 MAC_CHECK(check_kenv_dump, cred); 2519 2520 return (error); 2521} 2522 2523int 2524mac_check_kenv_get(struct ucred *cred, char *name) 2525{ 2526 int error; 2527 2528 if (!mac_enforce_system) 2529 return (0); 2530 2531 MAC_CHECK(check_kenv_get, cred, name); 2532 2533 return (error); 2534} 2535 2536int 2537mac_check_kenv_set(struct ucred *cred, char *name, char *value) 2538{ 2539 int error; 2540 2541 if (!mac_enforce_system) 2542 return (0); 2543 2544 MAC_CHECK(check_kenv_set, cred, name, value); 2545 2546 return (error); 2547} 2548 2549int 2550mac_check_kenv_unset(struct ucred *cred, char *name) 2551{ 2552 int error; 2553 2554 if (!mac_enforce_system) 2555 return (0); 2556 2557 MAC_CHECK(check_kenv_unset, cred, name); 2558 2559 return (error); 2560} 2561 2562int 2563mac_check_kld_load(struct ucred *cred, struct vnode *vp) 2564{ 2565 int error; 2566 2567 ASSERT_VOP_LOCKED(vp, "mac_check_kld_load"); 2568 2569 if (!mac_enforce_kld) 2570 return (0); 2571 2572 MAC_CHECK(check_kld_load, cred, vp, &vp->v_label); 2573 2574 return (error); 2575} 2576 2577int 2578mac_check_kld_stat(struct ucred *cred) 2579{ 2580 int error; 2581 2582 if (!mac_enforce_kld) 2583 return (0); 2584 2585 MAC_CHECK(check_kld_stat, cred); 2586 2587 return (error); 2588} 2589 2590int 2591mac_check_kld_unload(struct ucred *cred) 2592{ 2593 int error; 2594 2595 if (!mac_enforce_kld) 2596 return (0); 2597 2598 MAC_CHECK(check_kld_unload, cred); 2599 2600 return (error); 2601} 2602 2603int 2604mac_check_mount_stat(struct ucred *cred, struct mount *mount) 2605{ 2606 int error; 2607 2608 if (!mac_enforce_fs) 2609 return (0); 2610 2611 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); 2612 2613 return (error); 2614} 2615 2616int 2617mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, 2618 void *data) 2619{ 2620 int error; 2621 2622 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2623 2624 if (!mac_enforce_pipe) 2625 return (0); 2626 2627 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); 2628 2629 return (error); 2630} 2631 2632int 2633mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) 2634{ 2635 int error; 2636 2637 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2638 2639 if (!mac_enforce_pipe) 2640 return (0); 2641 2642 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); 2643 2644 return (error); 2645} 2646 2647int 2648mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) 2649{ 2650 int error; 2651 2652 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2653 2654 if (!mac_enforce_pipe) 2655 return (0); 2656 2657 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); 2658 2659 return (error); 2660} 2661 2662static int 2663mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 2664 struct label *newlabel) 2665{ 2666 int error; 2667 2668 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2669 2670 if (!mac_enforce_pipe) 2671 return (0); 2672 2673 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); 2674 2675 return (error); 2676} 2677 2678int 2679mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) 2680{ 2681 int error; 2682 2683 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2684 2685 if (!mac_enforce_pipe) 2686 return (0); 2687 2688 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); 2689 2690 return (error); 2691} 2692 2693int 2694mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) 2695{ 2696 int error; 2697 2698 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 2699 2700 if (!mac_enforce_pipe) 2701 return (0); 2702 2703 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); 2704 2705 return (error); 2706} 2707 2708int 2709mac_check_proc_debug(struct ucred *cred, struct proc *proc) 2710{ 2711 int error; 2712 2713 PROC_LOCK_ASSERT(proc, MA_OWNED); 2714 2715 if (!mac_enforce_process) 2716 return (0); 2717 2718 MAC_CHECK(check_proc_debug, cred, proc); 2719 2720 return (error); 2721} 2722 2723int 2724mac_check_proc_sched(struct ucred *cred, struct proc *proc) 2725{ 2726 int error; 2727 2728 PROC_LOCK_ASSERT(proc, MA_OWNED); 2729 2730 if (!mac_enforce_process) 2731 return (0); 2732 2733 MAC_CHECK(check_proc_sched, cred, proc); 2734 2735 return (error); 2736} 2737 2738int 2739mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 2740{ 2741 int error; 2742 2743 PROC_LOCK_ASSERT(proc, MA_OWNED); 2744 2745 if (!mac_enforce_process) 2746 return (0); 2747 2748 MAC_CHECK(check_proc_signal, cred, proc, signum); 2749 2750 return (error); 2751} 2752 2753int 2754mac_check_socket_bind(struct ucred *ucred, struct socket *socket, 2755 struct sockaddr *sockaddr) 2756{ 2757 int error; 2758 2759 if (!mac_enforce_socket) 2760 return (0); 2761 2762 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label, 2763 sockaddr); 2764 2765 return (error); 2766} 2767 2768int 2769mac_check_socket_connect(struct ucred *cred, struct socket *socket, 2770 struct sockaddr *sockaddr) 2771{ 2772 int error; 2773 2774 if (!mac_enforce_socket) 2775 return (0); 2776 2777 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label, 2778 sockaddr); 2779 2780 return (error); 2781} 2782 2783int 2784mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf) 2785{ 2786 struct label *label; 2787 int error; 2788 2789 if (!mac_enforce_socket) 2790 return (0); 2791 2792 label = mbuf_to_label(mbuf); 2793 2794 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf, 2795 label); 2796 2797 return (error); 2798} 2799 2800int 2801mac_check_socket_listen(struct ucred *cred, struct socket *socket) 2802{ 2803 int error; 2804 2805 if (!mac_enforce_socket) 2806 return (0); 2807 2808 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label); 2809 return (error); 2810} 2811 2812int 2813mac_check_socket_receive(struct ucred *cred, struct socket *so) 2814{ 2815 int error; 2816 2817 if (!mac_enforce_socket) 2818 return (0); 2819 2820 MAC_CHECK(check_socket_receive, cred, so, &so->so_label); 2821 2822 return (error); 2823} 2824 2825static int 2826mac_check_socket_relabel(struct ucred *cred, struct socket *socket, 2827 struct label *newlabel) 2828{ 2829 int error; 2830 2831 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label, 2832 newlabel); 2833 2834 return (error); 2835} 2836 2837int 2838mac_check_socket_send(struct ucred *cred, struct socket *so) 2839{ 2840 int error; 2841 2842 if (!mac_enforce_socket) 2843 return (0); 2844 2845 MAC_CHECK(check_socket_send, cred, so, &so->so_label); 2846 2847 return (error); 2848} 2849 2850int 2851mac_check_socket_visible(struct ucred *cred, struct socket *socket) 2852{ 2853 int error; 2854 2855 if (!mac_enforce_socket) 2856 return (0); 2857 2858 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label); 2859 2860 return (error); 2861} 2862 2863int 2864mac_check_sysarch_ioperm(struct ucred *cred) 2865{ 2866 int error; 2867 2868 if (!mac_enforce_system) 2869 return (0); 2870 2871 MAC_CHECK(check_sysarch_ioperm, cred); 2872 return (error); 2873} 2874 2875int 2876mac_check_system_acct(struct ucred *cred, struct vnode *vp) 2877{ 2878 int error; 2879 2880 if (vp != NULL) { 2881 ASSERT_VOP_LOCKED(vp, "mac_check_system_acct"); 2882 } 2883 2884 if (!mac_enforce_system) 2885 return (0); 2886 2887 MAC_CHECK(check_system_acct, cred, vp, 2888 vp != NULL ? &vp->v_label : NULL); 2889 2890 return (error); 2891} 2892 2893int 2894mac_check_system_nfsd(struct ucred *cred) 2895{ 2896 int error; 2897 2898 if (!mac_enforce_system) 2899 return (0); 2900 2901 MAC_CHECK(check_system_nfsd, cred); 2902 2903 return (error); 2904} 2905 2906int 2907mac_check_system_reboot(struct ucred *cred, int howto) 2908{ 2909 int error; 2910 2911 if (!mac_enforce_system) 2912 return (0); 2913 2914 MAC_CHECK(check_system_reboot, cred, howto); 2915 2916 return (error); 2917} 2918 2919int 2920mac_check_system_settime(struct ucred *cred) 2921{ 2922 int error; 2923 2924 if (!mac_enforce_system) 2925 return (0); 2926 2927 MAC_CHECK(check_system_settime, cred); 2928 2929 return (error); 2930} 2931 2932int 2933mac_check_system_swapon(struct ucred *cred, struct vnode *vp) 2934{ 2935 int error; 2936 2937 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon"); 2938 2939 if (!mac_enforce_system) 2940 return (0); 2941 2942 MAC_CHECK(check_system_swapon, cred, vp, &vp->v_label); 2943 return (error); 2944} 2945 2946int 2947mac_check_system_swapoff(struct ucred *cred, struct vnode *vp) 2948{ 2949 int error; 2950 2951 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapoff"); 2952 2953 if (!mac_enforce_system) 2954 return (0); 2955 2956 MAC_CHECK(check_system_swapoff, cred, vp, &vp->v_label); 2957 return (error); 2958} 2959 2960int 2961mac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen, 2962 void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen) 2963{ 2964 int error; 2965 2966 /* 2967 * XXXMAC: We're very much like to assert the SYSCTL_LOCK here, 2968 * but since it's not exported from kern_sysctl.c, we can't. 2969 */ 2970 if (!mac_enforce_system) 2971 return (0); 2972 2973 MAC_CHECK(check_system_sysctl, cred, name, namelen, old, oldlenp, 2974 inkernel, new, newlen); 2975 2976 return (error); 2977} 2978 2979int 2980mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 2981 struct ifnet *ifnet) 2982{ 2983 char *elements, *buffer; 2984 struct mac mac; 2985 int error; 2986 2987 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 2988 if (error) 2989 return (error); 2990 2991 error = mac_check_structmac_consistent(&mac); 2992 if (error) 2993 return (error); 2994 2995 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 2996 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 2997 if (error) { 2998 free(elements, M_MACTEMP); 2999 return (error); 3000 } 3001 3002 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3003 error = mac_externalize_ifnet_label(&ifnet->if_label, elements, 3004 buffer, mac.m_buflen, M_WAITOK); 3005 if (error == 0) 3006 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3007 3008 free(buffer, M_MACTEMP); 3009 free(elements, M_MACTEMP); 3010 3011 return (error); 3012} 3013 3014int 3015mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 3016 struct ifnet *ifnet) 3017{ 3018 struct label intlabel; 3019 struct mac mac; 3020 char *buffer; 3021 int error; 3022 3023 error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac)); 3024 if (error) 3025 return (error); 3026 3027 error = mac_check_structmac_consistent(&mac); 3028 if (error) 3029 return (error); 3030 3031 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3032 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3033 if (error) { 3034 free(buffer, M_MACTEMP); 3035 return (error); 3036 } 3037 3038 mac_init_ifnet_label(&intlabel); 3039 error = mac_internalize_ifnet_label(&intlabel, buffer); 3040 free(buffer, M_MACTEMP); 3041 if (error) { 3042 mac_destroy_ifnet_label(&intlabel); 3043 return (error); 3044 } 3045 3046 /* 3047 * XXX: Note that this is a redundant privilege check, since 3048 * policies impose this check themselves if required by the 3049 * policy. Eventually, this should go away. 3050 */ 3051 error = suser_cred(cred, 0); 3052 if (error) { 3053 mac_destroy_ifnet_label(&intlabel); 3054 return (error); 3055 } 3056 3057 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label, 3058 &intlabel); 3059 if (error) { 3060 mac_destroy_ifnet_label(&intlabel); 3061 return (error); 3062 } 3063 3064 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel); 3065 3066 mac_destroy_ifnet_label(&intlabel); 3067 return (0); 3068} 3069 3070void 3071mac_create_devfs_device(struct mount *mp, dev_t dev, struct devfs_dirent *de) 3072{ 3073 3074 MAC_PERFORM(create_devfs_device, mp, dev, de, &de->de_label); 3075} 3076 3077void 3078mac_create_devfs_symlink(struct ucred *cred, struct mount *mp, 3079 struct devfs_dirent *dd, struct devfs_dirent *de) 3080{ 3081 3082 MAC_PERFORM(create_devfs_symlink, cred, mp, dd, &dd->de_label, de, 3083 &de->de_label); 3084} 3085 3086void 3087mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen, 3088 struct devfs_dirent *de) 3089{ 3090 3091 MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de, 3092 &de->de_label); 3093} 3094 3095int 3096mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 3097 struct mac *mac) 3098{ 3099 struct label intlabel; 3100 char *buffer; 3101 int error; 3102 3103 error = mac_check_structmac_consistent(mac); 3104 if (error) 3105 return (error); 3106 3107 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3108 error = copyinstr(mac->m_string, buffer, mac->m_buflen, NULL); 3109 if (error) { 3110 free(buffer, M_MACTEMP); 3111 return (error); 3112 } 3113 3114 mac_init_socket_label(&intlabel, M_WAITOK); 3115 error = mac_internalize_socket_label(&intlabel, buffer); 3116 free(buffer, M_MACTEMP); 3117 if (error) { 3118 mac_destroy_socket_label(&intlabel); 3119 return (error); 3120 } 3121 3122 mac_check_socket_relabel(cred, so, &intlabel); 3123 if (error) { 3124 mac_destroy_socket_label(&intlabel); 3125 return (error); 3126 } 3127 3128 mac_relabel_socket(cred, so, &intlabel); 3129 3130 mac_destroy_socket_label(&intlabel); 3131 return (0); 3132} 3133 3134int 3135mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) 3136{ 3137 int error; 3138 3139 PIPE_LOCK_ASSERT(pipe, MA_OWNED); 3140 3141 error = mac_check_pipe_relabel(cred, pipe, label); 3142 if (error) 3143 return (error); 3144 3145 mac_relabel_pipe(cred, pipe, label); 3146 3147 return (0); 3148} 3149 3150int 3151mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 3152 struct mac *mac) 3153{ 3154 char *buffer, *elements; 3155 int error; 3156 3157 error = mac_check_structmac_consistent(mac); 3158 if (error) 3159 return (error); 3160 3161 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3162 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 3163 if (error) { 3164 free(elements, M_MACTEMP); 3165 return (error); 3166 } 3167 3168 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3169 error = mac_externalize_socket_label(&so->so_label, elements, 3170 buffer, mac->m_buflen, M_WAITOK); 3171 if (error == 0) 3172 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 3173 3174 free(buffer, M_MACTEMP); 3175 free(elements, M_MACTEMP); 3176 3177 return (error); 3178} 3179 3180int 3181mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 3182 struct mac *mac) 3183{ 3184 char *elements, *buffer; 3185 int error; 3186 3187 error = mac_check_structmac_consistent(mac); 3188 if (error) 3189 return (error); 3190 3191 elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK); 3192 error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL); 3193 if (error) { 3194 free(elements, M_MACTEMP); 3195 return (error); 3196 } 3197 3198 buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3199 error = mac_externalize_socket_peer_label(&so->so_peerlabel, 3200 elements, buffer, mac->m_buflen, M_WAITOK); 3201 if (error == 0) 3202 error = copyout(buffer, mac->m_string, strlen(buffer)+1); 3203 3204 free(buffer, M_MACTEMP); 3205 free(elements, M_MACTEMP); 3206 3207 return (error); 3208} 3209 3210/* 3211 * Implementation of VOP_SETLABEL() that relies on extended attributes 3212 * to store label data. Can be referenced by filesystems supporting 3213 * extended attributes. 3214 */ 3215int 3216vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 3217{ 3218 struct vnode *vp = ap->a_vp; 3219 struct label *intlabel = ap->a_label; 3220 int error; 3221 3222 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 3223 3224 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3225 return (EOPNOTSUPP); 3226 3227 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); 3228 if (error) 3229 return (error); 3230 3231 mac_relabel_vnode(ap->a_cred, vp, intlabel); 3232 3233 return (0); 3234} 3235 3236static int 3237vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 3238{ 3239 int error; 3240 3241 if (vp->v_mount == NULL) { 3242 /* printf("vn_setlabel: null v_mount\n"); */ 3243 if (vp->v_type != VNON) 3244 printf("vn_setlabel: null v_mount with non-VNON\n"); 3245 return (EBADF); 3246 } 3247 3248 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 3249 return (EOPNOTSUPP); 3250 3251 /* 3252 * Multi-phase commit. First check the policies to confirm the 3253 * change is OK. Then commit via the filesystem. Finally, 3254 * update the actual vnode label. Question: maybe the filesystem 3255 * should update the vnode at the end as part of VOP_SETLABEL()? 3256 */ 3257 error = mac_check_vnode_relabel(cred, vp, intlabel); 3258 if (error) 3259 return (error); 3260 3261 /* 3262 * VADMIN provides the opportunity for the filesystem to make 3263 * decisions about who is and is not able to modify labels 3264 * and protections on files. This might not be right. We can't 3265 * assume VOP_SETLABEL() will do it, because we might implement 3266 * that as part of vop_stdsetlabel_ea(). 3267 */ 3268 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 3269 if (error) 3270 return (error); 3271 3272 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 3273 if (error) 3274 return (error); 3275 3276 return (0); 3277} 3278 3279int 3280__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3281{ 3282 char *elements, *buffer; 3283 struct mac mac; 3284 struct proc *tproc; 3285 struct ucred *tcred; 3286 int error; 3287 3288 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3289 if (error) 3290 return (error); 3291 3292 error = mac_check_structmac_consistent(&mac); 3293 if (error) 3294 return (error); 3295 3296 tproc = pfind(uap->pid); 3297 if (tproc == NULL) 3298 return (ESRCH); 3299 3300 tcred = NULL; /* Satisfy gcc. */ 3301 error = p_cansee(td, tproc); 3302 if (error == 0) 3303 tcred = crhold(tproc->p_ucred); 3304 PROC_UNLOCK(tproc); 3305 if (error) 3306 return (error); 3307 3308 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3309 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3310 if (error) { 3311 free(elements, M_MACTEMP); 3312 crfree(tcred); 3313 return (error); 3314 } 3315 3316 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3317 error = mac_externalize_cred_label(&tcred->cr_label, elements, 3318 buffer, mac.m_buflen, M_WAITOK); 3319 if (error == 0) 3320 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3321 3322 free(buffer, M_MACTEMP); 3323 free(elements, M_MACTEMP); 3324 crfree(tcred); 3325 return (error); 3326} 3327 3328/* 3329 * MPSAFE 3330 */ 3331int 3332__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3333{ 3334 char *elements, *buffer; 3335 struct mac mac; 3336 int error; 3337 3338 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3339 if (error) 3340 return (error); 3341 3342 error = mac_check_structmac_consistent(&mac); 3343 if (error) 3344 return (error); 3345 3346 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3347 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3348 if (error) { 3349 free(elements, M_MACTEMP); 3350 return (error); 3351 } 3352 3353 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3354 error = mac_externalize_cred_label(&td->td_ucred->cr_label, 3355 elements, buffer, mac.m_buflen, M_WAITOK); 3356 if (error == 0) 3357 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3358 3359 free(buffer, M_MACTEMP); 3360 free(elements, M_MACTEMP); 3361 return (error); 3362} 3363 3364/* 3365 * MPSAFE 3366 */ 3367int 3368__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3369{ 3370 struct ucred *newcred, *oldcred; 3371 struct label intlabel; 3372 struct proc *p; 3373 struct mac mac; 3374 char *buffer; 3375 int error; 3376 3377 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3378 if (error) 3379 return (error); 3380 3381 error = mac_check_structmac_consistent(&mac); 3382 if (error) 3383 return (error); 3384 3385 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3386 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3387 if (error) { 3388 free(buffer, M_MACTEMP); 3389 return (error); 3390 } 3391 3392 mac_init_cred_label(&intlabel); 3393 error = mac_internalize_cred_label(&intlabel, buffer); 3394 free(buffer, M_MACTEMP); 3395 if (error) { 3396 mac_destroy_cred_label(&intlabel); 3397 return (error); 3398 } 3399 3400 newcred = crget(); 3401 3402 p = td->td_proc; 3403 PROC_LOCK(p); 3404 oldcred = p->p_ucred; 3405 3406 error = mac_check_cred_relabel(oldcred, &intlabel); 3407 if (error) { 3408 PROC_UNLOCK(p); 3409 crfree(newcred); 3410 goto out; 3411 } 3412 3413 setsugid(p); 3414 crcopy(newcred, oldcred); 3415 mac_relabel_cred(newcred, &intlabel); 3416 p->p_ucred = newcred; 3417 3418 /* 3419 * Grab additional reference for use while revoking mmaps, prior 3420 * to releasing the proc lock and sharing the cred. 3421 */ 3422 crhold(newcred); 3423 PROC_UNLOCK(p); 3424 3425 if (mac_enforce_vm) { 3426 mtx_lock(&Giant); 3427 mac_cred_mmapped_drop_perms(td, newcred); 3428 mtx_unlock(&Giant); 3429 } 3430 3431 crfree(newcred); /* Free revocation reference. */ 3432 crfree(oldcred); 3433 3434out: 3435 mac_destroy_cred_label(&intlabel); 3436 return (error); 3437} 3438 3439/* 3440 * MPSAFE 3441 */ 3442int 3443__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3444{ 3445 char *elements, *buffer; 3446 struct label intlabel; 3447 struct file *fp; 3448 struct mac mac; 3449 struct vnode *vp; 3450 struct pipe *pipe; 3451 short label_type; 3452 int error; 3453 3454 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3455 if (error) 3456 return (error); 3457 3458 error = mac_check_structmac_consistent(&mac); 3459 if (error) 3460 return (error); 3461 3462 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3463 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3464 if (error) { 3465 free(elements, M_MACTEMP); 3466 return (error); 3467 } 3468 3469 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3470 mtx_lock(&Giant); /* VFS */ 3471 error = fget(td, uap->fd, &fp); 3472 if (error) 3473 goto out; 3474 3475 label_type = fp->f_type; 3476 switch (fp->f_type) { 3477 case DTYPE_FIFO: 3478 case DTYPE_VNODE: 3479 vp = fp->f_vnode; 3480 3481 mac_init_vnode_label(&intlabel); 3482 3483 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3484 mac_copy_vnode_label(&vp->v_label, &intlabel); 3485 VOP_UNLOCK(vp, 0, td); 3486 3487 break; 3488 case DTYPE_PIPE: 3489 pipe = fp->f_data; 3490 3491 mac_init_pipe_label(&intlabel); 3492 3493 PIPE_LOCK(pipe); 3494 mac_copy_pipe_label(pipe->pipe_label, &intlabel); 3495 PIPE_UNLOCK(pipe); 3496 break; 3497 default: 3498 error = EINVAL; 3499 fdrop(fp, td); 3500 goto out; 3501 } 3502 fdrop(fp, td); 3503 3504 switch (label_type) { 3505 case DTYPE_FIFO: 3506 case DTYPE_VNODE: 3507 if (error == 0) 3508 error = mac_externalize_vnode_label(&intlabel, 3509 elements, buffer, mac.m_buflen, M_WAITOK); 3510 mac_destroy_vnode_label(&intlabel); 3511 break; 3512 case DTYPE_PIPE: 3513 error = mac_externalize_pipe_label(&intlabel, elements, 3514 buffer, mac.m_buflen, M_WAITOK); 3515 mac_destroy_pipe_label(&intlabel); 3516 break; 3517 default: 3518 panic("__mac_get_fd: corrupted label_type"); 3519 } 3520 3521 if (error == 0) 3522 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3523 3524out: 3525 mtx_unlock(&Giant); /* VFS */ 3526 free(buffer, M_MACTEMP); 3527 free(elements, M_MACTEMP); 3528 3529 return (error); 3530} 3531 3532/* 3533 * MPSAFE 3534 */ 3535int 3536__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3537{ 3538 char *elements, *buffer; 3539 struct nameidata nd; 3540 struct label intlabel; 3541 struct mac mac; 3542 int error; 3543 3544 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3545 if (error) 3546 return (error); 3547 3548 error = mac_check_structmac_consistent(&mac); 3549 if (error) 3550 return (error); 3551 3552 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3553 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3554 if (error) { 3555 free(elements, M_MACTEMP); 3556 return (error); 3557 } 3558 3559 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3560 mtx_lock(&Giant); /* VFS */ 3561 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3562 td); 3563 error = namei(&nd); 3564 if (error) 3565 goto out; 3566 3567 mac_init_vnode_label(&intlabel); 3568 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3569 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3570 mac.m_buflen, M_WAITOK); 3571 3572 NDFREE(&nd, 0); 3573 mac_destroy_vnode_label(&intlabel); 3574 3575 if (error == 0) 3576 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3577 3578out: 3579 mtx_unlock(&Giant); /* VFS */ 3580 3581 free(buffer, M_MACTEMP); 3582 free(elements, M_MACTEMP); 3583 3584 return (error); 3585} 3586 3587/* 3588 * MPSAFE 3589 */ 3590int 3591__mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3592{ 3593 char *elements, *buffer; 3594 struct nameidata nd; 3595 struct label intlabel; 3596 struct mac mac; 3597 int error; 3598 3599 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3600 if (error) 3601 return (error); 3602 3603 error = mac_check_structmac_consistent(&mac); 3604 if (error) 3605 return (error); 3606 3607 elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3608 error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); 3609 if (error) { 3610 free(elements, M_MACTEMP); 3611 return (error); 3612 } 3613 3614 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); 3615 mtx_lock(&Giant); /* VFS */ 3616 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3617 td); 3618 error = namei(&nd); 3619 if (error) 3620 goto out; 3621 3622 mac_init_vnode_label(&intlabel); 3623 mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); 3624 error = mac_externalize_vnode_label(&intlabel, elements, buffer, 3625 mac.m_buflen, M_WAITOK); 3626 NDFREE(&nd, 0); 3627 mac_destroy_vnode_label(&intlabel); 3628 3629 if (error == 0) 3630 error = copyout(buffer, mac.m_string, strlen(buffer)+1); 3631 3632out: 3633 mtx_unlock(&Giant); /* VFS */ 3634 3635 free(buffer, M_MACTEMP); 3636 free(elements, M_MACTEMP); 3637 3638 return (error); 3639} 3640 3641/* 3642 * MPSAFE 3643 */ 3644int 3645__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3646{ 3647 struct label intlabel; 3648 struct pipe *pipe; 3649 struct file *fp; 3650 struct mount *mp; 3651 struct vnode *vp; 3652 struct mac mac; 3653 char *buffer; 3654 int error; 3655 3656 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3657 if (error) 3658 return (error); 3659 3660 error = mac_check_structmac_consistent(&mac); 3661 if (error) 3662 return (error); 3663 3664 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3665 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3666 if (error) { 3667 free(buffer, M_MACTEMP); 3668 return (error); 3669 } 3670 3671 mtx_lock(&Giant); /* VFS */ 3672 3673 error = fget(td, uap->fd, &fp); 3674 if (error) 3675 goto out; 3676 3677 switch (fp->f_type) { 3678 case DTYPE_FIFO: 3679 case DTYPE_VNODE: 3680 mac_init_vnode_label(&intlabel); 3681 error = mac_internalize_vnode_label(&intlabel, buffer); 3682 if (error) { 3683 mac_destroy_vnode_label(&intlabel); 3684 break; 3685 } 3686 3687 vp = fp->f_vnode; 3688 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3689 if (error != 0) { 3690 mac_destroy_vnode_label(&intlabel); 3691 break; 3692 } 3693 3694 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3695 error = vn_setlabel(vp, &intlabel, td->td_ucred); 3696 VOP_UNLOCK(vp, 0, td); 3697 vn_finished_write(mp); 3698 3699 mac_destroy_vnode_label(&intlabel); 3700 break; 3701 3702 case DTYPE_PIPE: 3703 mac_init_pipe_label(&intlabel); 3704 error = mac_internalize_pipe_label(&intlabel, buffer); 3705 if (error == 0) { 3706 pipe = fp->f_data; 3707 PIPE_LOCK(pipe); 3708 error = mac_pipe_label_set(td->td_ucred, pipe, 3709 &intlabel); 3710 PIPE_UNLOCK(pipe); 3711 } 3712 3713 mac_destroy_pipe_label(&intlabel); 3714 break; 3715 3716 default: 3717 error = EINVAL; 3718 } 3719 3720 fdrop(fp, td); 3721out: 3722 mtx_unlock(&Giant); /* VFS */ 3723 3724 free(buffer, M_MACTEMP); 3725 3726 return (error); 3727} 3728 3729/* 3730 * MPSAFE 3731 */ 3732int 3733__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3734{ 3735 struct label intlabel; 3736 struct nameidata nd; 3737 struct mount *mp; 3738 struct mac mac; 3739 char *buffer; 3740 int error; 3741 3742 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3743 if (error) 3744 return (error); 3745 3746 error = mac_check_structmac_consistent(&mac); 3747 if (error) 3748 return (error); 3749 3750 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3751 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3752 if (error) { 3753 free(buffer, M_MACTEMP); 3754 return (error); 3755 } 3756 3757 mac_init_vnode_label(&intlabel); 3758 error = mac_internalize_vnode_label(&intlabel, buffer); 3759 free(buffer, M_MACTEMP); 3760 if (error) { 3761 mac_destroy_vnode_label(&intlabel); 3762 return (error); 3763 } 3764 3765 mtx_lock(&Giant); /* VFS */ 3766 3767 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, 3768 td); 3769 error = namei(&nd); 3770 if (error == 0) { 3771 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3772 if (error == 0) 3773 error = vn_setlabel(nd.ni_vp, &intlabel, 3774 td->td_ucred); 3775 vn_finished_write(mp); 3776 } 3777 3778 NDFREE(&nd, 0); 3779 mtx_unlock(&Giant); /* VFS */ 3780 mac_destroy_vnode_label(&intlabel); 3781 3782 return (error); 3783} 3784 3785/* 3786 * MPSAFE 3787 */ 3788int 3789__mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3790{ 3791 struct label intlabel; 3792 struct nameidata nd; 3793 struct mount *mp; 3794 struct mac mac; 3795 char *buffer; 3796 int error; 3797 3798 error = copyin(uap->mac_p, &mac, sizeof(mac)); 3799 if (error) 3800 return (error); 3801 3802 error = mac_check_structmac_consistent(&mac); 3803 if (error) 3804 return (error); 3805 3806 buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); 3807 error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL); 3808 if (error) { 3809 free(buffer, M_MACTEMP); 3810 return (error); 3811 } 3812 3813 mac_init_vnode_label(&intlabel); 3814 error = mac_internalize_vnode_label(&intlabel, buffer); 3815 free(buffer, M_MACTEMP); 3816 if (error) { 3817 mac_destroy_vnode_label(&intlabel); 3818 return (error); 3819 } 3820 3821 mtx_lock(&Giant); /* VFS */ 3822 3823 NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, 3824 td); 3825 error = namei(&nd); 3826 if (error == 0) { 3827 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 3828 if (error == 0) 3829 error = vn_setlabel(nd.ni_vp, &intlabel, 3830 td->td_ucred); 3831 vn_finished_write(mp); 3832 } 3833 3834 NDFREE(&nd, 0); 3835 mtx_unlock(&Giant); /* VFS */ 3836 mac_destroy_vnode_label(&intlabel); 3837 3838 return (error); 3839} 3840 3841/* 3842 * MPSAFE 3843 */ 3844int 3845mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3846{ 3847 struct mac_policy_conf *mpc; 3848 char target[MAC_MAX_POLICY_NAME]; 3849 int entrycount, error; 3850 3851 error = copyinstr(uap->policy, target, sizeof(target), NULL); 3852 if (error) 3853 return (error); 3854 3855 error = ENOSYS; 3856 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3857 if (strcmp(mpc->mpc_name, target) == 0 && 3858 mpc->mpc_ops->mpo_syscall != NULL) { 3859 error = mpc->mpc_ops->mpo_syscall(td, 3860 uap->call, uap->arg); 3861 goto out; 3862 } 3863 } 3864 3865 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { 3866 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { 3867 if (strcmp(mpc->mpc_name, target) == 0 && 3868 mpc->mpc_ops->mpo_syscall != NULL) { 3869 error = mpc->mpc_ops->mpo_syscall(td, 3870 uap->call, uap->arg); 3871 break; 3872 } 3873 } 3874 mac_policy_list_unbusy(); 3875 } 3876out: 3877 return (error); 3878} 3879 3880SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); 3881SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); 3882 3883#else /* !MAC */ 3884 3885int 3886__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) 3887{ 3888 3889 return (ENOSYS); 3890} 3891 3892int 3893__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) 3894{ 3895 3896 return (ENOSYS); 3897} 3898 3899int 3900__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) 3901{ 3902 3903 return (ENOSYS); 3904} 3905 3906int 3907__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) 3908{ 3909 3910 return (ENOSYS); 3911} 3912 3913int 3914__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) 3915{ 3916 3917 return (ENOSYS); 3918} 3919 3920int 3921__mac_get_link(struct thread *td, struct __mac_get_link_args *uap) 3922{ 3923 3924 return (ENOSYS); 3925} 3926 3927int 3928__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) 3929{ 3930 3931 return (ENOSYS); 3932} 3933 3934int 3935__mac_set_file(struct thread *td, struct __mac_set_file_args *uap) 3936{ 3937 3938 return (ENOSYS); 3939} 3940 3941int 3942__mac_set_link(struct thread *td, struct __mac_set_link_args *uap) 3943{ 3944 3945 return (ENOSYS); 3946} 3947 3948int 3949mac_syscall(struct thread *td, struct mac_syscall_args *uap) 3950{ 3951 3952 return (ENOSYS); 3953} 3954 3955#endif 3956