1/*- 2 * Copyright (c) 1999-2002, 2009 Robert N. M. Watson 3 * Copyright (c) 2001 Ilmar S. Habibulin 4 * Copyright (c) 2001-2005 McAfee, Inc. 5 * Copyright (c) 2005-2006 SPARTA, Inc. 6 * Copyright (c) 2008 Apple Inc. 7 * All rights reserved. 8 * 9 * This software was developed by Robert Watson and Ilmar Habibulin for the 10 * TrustedBSD Project. 11 * 12 * This software was developed for the FreeBSD Project in part by McAfee 13 * Research, the Security Research Division of McAfee, Inc. under 14 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 15 * CHATS research program. 16 * 17 * This software was enhanced by SPARTA ISSO under SPAWAR contract 18 * N66001-04-C-6019 ("SEFOS"). 19 * 20 * This software was developed at the University of Cambridge Computer 21 * Laboratory with support from a grant from Google, Inc. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the above copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 */ 44 45#include <sys/cdefs.h> 46__FBSDID("$FreeBSD$"); 47 48#include "opt_kdtrace.h" 49#include "opt_mac.h" 50 51#include <sys/param.h> 52#include <sys/condvar.h> 53#include <sys/extattr.h> 54#include <sys/imgact.h> 55#include <sys/kernel.h> 56#include <sys/lock.h> 57#include <sys/malloc.h> 58#include <sys/mutex.h> 59#include <sys/proc.h> 60#include <sys/sbuf.h> 61#include <sys/systm.h> 62#include <sys/vnode.h> 63#include <sys/mount.h> 64#include <sys/file.h> 65#include <sys/namei.h> 66#include <sys/sdt.h> 67#include <sys/sysctl.h> 68 69#include <vm/vm.h> 70#include <vm/pmap.h> 71#include <vm/vm_map.h> 72#include <vm/vm_object.h> 73 74#include <fs/devfs/devfs.h> 75 76#include <security/mac/mac_framework.h> 77#include <security/mac/mac_internal.h> 78#include <security/mac/mac_policy.h> 79 80/* 81 * Warn about EA transactions only the first time they happen. No locking on 82 * this variable. 83 */ 84static int ea_warn_once = 0; 85 86static int mac_vnode_setlabel_extattr(struct ucred *cred, 87 struct vnode *vp, struct label *intlabel); 88 89static struct label * 90mac_devfs_label_alloc(void) 91{ 92 struct label *label; 93 94 label = mac_labelzone_alloc(M_WAITOK); 95 MAC_POLICY_PERFORM(devfs_init_label, label); 96 return (label); 97} 98 99void 100mac_devfs_init(struct devfs_dirent *de) 101{ 102 103 if (mac_labeled & MPC_OBJECT_DEVFS) 104 de->de_label = mac_devfs_label_alloc(); 105 else 106 de->de_label = NULL; 107} 108 109static struct label * 110mac_mount_label_alloc(void) 111{ 112 struct label *label; 113 114 label = mac_labelzone_alloc(M_WAITOK); 115 MAC_POLICY_PERFORM(mount_init_label, label); 116 return (label); 117} 118 119void 120mac_mount_init(struct mount *mp) 121{ 122 123 if (mac_labeled & MPC_OBJECT_MOUNT) 124 mp->mnt_label = mac_mount_label_alloc(); 125 else 126 mp->mnt_label = NULL; 127} 128 129struct label * 130mac_vnode_label_alloc(void) 131{ 132 struct label *label; 133 134 label = mac_labelzone_alloc(M_WAITOK); 135 MAC_POLICY_PERFORM(vnode_init_label, label); 136 return (label); 137} 138 139void 140mac_vnode_init(struct vnode *vp) 141{ 142 143 if (mac_labeled & MPC_OBJECT_VNODE) 144 vp->v_label = mac_vnode_label_alloc(); 145 else 146 vp->v_label = NULL; 147} 148 149static void 150mac_devfs_label_free(struct label *label) 151{ 152 153 MAC_POLICY_PERFORM_NOSLEEP(devfs_destroy_label, label); 154 mac_labelzone_free(label); 155} 156 157void 158mac_devfs_destroy(struct devfs_dirent *de) 159{ 160 161 if (de->de_label != NULL) { 162 mac_devfs_label_free(de->de_label); 163 de->de_label = NULL; 164 } 165} 166 167static void 168mac_mount_label_free(struct label *label) 169{ 170 171 MAC_POLICY_PERFORM_NOSLEEP(mount_destroy_label, label); 172 mac_labelzone_free(label); 173} 174 175void 176mac_mount_destroy(struct mount *mp) 177{ 178 179 if (mp->mnt_label != NULL) { 180 mac_mount_label_free(mp->mnt_label); 181 mp->mnt_label = NULL; 182 } 183} 184 185void 186mac_vnode_label_free(struct label *label) 187{ 188 189 MAC_POLICY_PERFORM_NOSLEEP(vnode_destroy_label, label); 190 mac_labelzone_free(label); 191} 192 193void 194mac_vnode_destroy(struct vnode *vp) 195{ 196 197 if (vp->v_label != NULL) { 198 mac_vnode_label_free(vp->v_label); 199 vp->v_label = NULL; 200 } 201} 202 203void 204mac_vnode_copy_label(struct label *src, struct label *dest) 205{ 206 207 MAC_POLICY_PERFORM_NOSLEEP(vnode_copy_label, src, dest); 208} 209 210int 211mac_vnode_externalize_label(struct label *label, char *elements, 212 char *outbuf, size_t outbuflen) 213{ 214 int error; 215 216 MAC_POLICY_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen); 217 218 return (error); 219} 220 221int 222mac_vnode_internalize_label(struct label *label, char *string) 223{ 224 int error; 225 226 MAC_POLICY_INTERNALIZE(vnode, label, string); 227 228 return (error); 229} 230 231void 232mac_devfs_update(struct mount *mp, struct devfs_dirent *de, struct vnode *vp) 233{ 234 235 MAC_POLICY_PERFORM_NOSLEEP(devfs_update, mp, de, de->de_label, vp, 236 vp->v_label); 237} 238 239void 240mac_devfs_vnode_associate(struct mount *mp, struct devfs_dirent *de, 241 struct vnode *vp) 242{ 243 244 MAC_POLICY_PERFORM_NOSLEEP(devfs_vnode_associate, mp, mp->mnt_label, 245 de, de->de_label, vp, vp->v_label); 246} 247 248int 249mac_vnode_associate_extattr(struct mount *mp, struct vnode *vp) 250{ 251 int error; 252 253 ASSERT_VOP_LOCKED(vp, "mac_vnode_associate_extattr"); 254 255 MAC_POLICY_CHECK(vnode_associate_extattr, mp, mp->mnt_label, vp, 256 vp->v_label); 257 258 return (error); 259} 260 261void 262mac_vnode_associate_singlelabel(struct mount *mp, struct vnode *vp) 263{ 264 265 MAC_POLICY_PERFORM_NOSLEEP(vnode_associate_singlelabel, mp, 266 mp->mnt_label, vp, vp->v_label); 267} 268 269/* 270 * Functions implementing extended-attribute backed labels for file systems 271 * that support it. 272 * 273 * Where possible, we use EA transactions to make writes to multiple 274 * attributes across difference policies mutually atomic. We allow work to 275 * continue on file systems not supporting EA transactions, but generate a 276 * printf warning. 277 */ 278int 279mac_vnode_create_extattr(struct ucred *cred, struct mount *mp, 280 struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 281{ 282 int error; 283 284 ASSERT_VOP_LOCKED(dvp, "mac_vnode_create_extattr"); 285 ASSERT_VOP_LOCKED(vp, "mac_vnode_create_extattr"); 286 287 error = VOP_OPENEXTATTR(vp, cred, curthread); 288 if (error == EOPNOTSUPP) { 289 if (ea_warn_once == 0) { 290 printf("Warning: transactions not supported " 291 "in EA write.\n"); 292 ea_warn_once = 1; 293 } 294 } else if (error) 295 return (error); 296 297 MAC_POLICY_CHECK(vnode_create_extattr, cred, mp, mp->mnt_label, dvp, 298 dvp->v_label, vp, vp->v_label, cnp); 299 300 if (error) { 301 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 302 return (error); 303 } 304 305 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 306 if (error == EOPNOTSUPP) 307 error = 0; 308 309 return (error); 310} 311 312static int 313mac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 314 struct label *intlabel) 315{ 316 int error; 317 318 ASSERT_VOP_LOCKED(vp, "mac_vnode_setlabel_extattr"); 319 320 error = VOP_OPENEXTATTR(vp, cred, curthread); 321 if (error == EOPNOTSUPP) { 322 if (ea_warn_once == 0) { 323 printf("Warning: transactions not supported " 324 "in EA write.\n"); 325 ea_warn_once = 1; 326 } 327 } else if (error) 328 return (error); 329 330 MAC_POLICY_CHECK(vnode_setlabel_extattr, cred, vp, vp->v_label, 331 intlabel); 332 333 if (error) { 334 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 335 return (error); 336 } 337 338 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 339 if (error == EOPNOTSUPP) 340 error = 0; 341 342 return (error); 343} 344 345void 346mac_vnode_execve_transition(struct ucred *old, struct ucred *new, 347 struct vnode *vp, struct label *interpvplabel, struct image_params *imgp) 348{ 349 350 ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_transition"); 351 352 MAC_POLICY_PERFORM(vnode_execve_transition, old, new, vp, 353 vp->v_label, interpvplabel, imgp, imgp->execlabel); 354} 355 356int 357mac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp, 358 struct label *interpvplabel, struct image_params *imgp) 359{ 360 int result; 361 362 ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_will_transition"); 363 364 result = 0; 365 /* No sleeping since the process lock will be held by the caller. */ 366 MAC_POLICY_BOOLEAN_NOSLEEP(vnode_execve_will_transition, ||, old, vp, 367 vp->v_label, interpvplabel, imgp, imgp->execlabel); 368 369 return (result); 370} 371 372MAC_CHECK_PROBE_DEFINE3(vnode_check_access, "struct ucred *", 373 "struct vnode *", "accmode_t"); 374 375int 376mac_vnode_check_access(struct ucred *cred, struct vnode *vp, accmode_t accmode) 377{ 378 int error; 379 380 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_access"); 381 382 MAC_POLICY_CHECK(vnode_check_access, cred, vp, vp->v_label, accmode); 383 MAC_CHECK_PROBE3(vnode_check_access, error, cred, vp, accmode); 384 385 return (error); 386} 387 388MAC_CHECK_PROBE_DEFINE2(vnode_check_chdir, "struct ucred *", 389 "struct vnode *"); 390 391int 392mac_vnode_check_chdir(struct ucred *cred, struct vnode *dvp) 393{ 394 int error; 395 396 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chdir"); 397 398 MAC_POLICY_CHECK(vnode_check_chdir, cred, dvp, dvp->v_label); 399 MAC_CHECK_PROBE2(vnode_check_chdir, error, cred, dvp); 400 401 return (error); 402} 403 404MAC_CHECK_PROBE_DEFINE2(vnode_check_chroot, "struct ucred *", 405 "struct vnode *"); 406 407int 408mac_vnode_check_chroot(struct ucred *cred, struct vnode *dvp) 409{ 410 int error; 411 412 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chroot"); 413 414 MAC_POLICY_CHECK(vnode_check_chroot, cred, dvp, dvp->v_label); 415 MAC_CHECK_PROBE2(vnode_check_chroot, error, cred, dvp); 416 417 return (error); 418} 419 420MAC_CHECK_PROBE_DEFINE4(vnode_check_create, "struct ucred *", 421 "struct vnode *", "struct componentname *", "struct vattr *"); 422 423int 424mac_vnode_check_create(struct ucred *cred, struct vnode *dvp, 425 struct componentname *cnp, struct vattr *vap) 426{ 427 int error; 428 429 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_create"); 430 431 MAC_POLICY_CHECK(vnode_check_create, cred, dvp, dvp->v_label, cnp, 432 vap); 433 MAC_CHECK_PROBE4(vnode_check_create, error, cred, dvp, cnp, vap); 434 435 return (error); 436} 437 438MAC_CHECK_PROBE_DEFINE3(vnode_check_deleteacl, "struct ucred *", 439 "struct vnode *", "acl_type_t"); 440 441int 442mac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 443 acl_type_t type) 444{ 445 int error; 446 447 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteacl"); 448 449 MAC_POLICY_CHECK(vnode_check_deleteacl, cred, vp, vp->v_label, type); 450 MAC_CHECK_PROBE3(vnode_check_deleteacl, error, cred, vp, type); 451 452 return (error); 453} 454 455MAC_CHECK_PROBE_DEFINE4(vnode_check_deleteextattr, "struct ucred *", 456 "struct vnode *", "int", "const char *"); 457 458int 459mac_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 460 int attrnamespace, const char *name) 461{ 462 int error; 463 464 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteextattr"); 465 466 MAC_POLICY_CHECK(vnode_check_deleteextattr, cred, vp, vp->v_label, 467 attrnamespace, name); 468 MAC_CHECK_PROBE4(vnode_check_deleteextattr, error, cred, vp, 469 attrnamespace, name); 470 471 return (error); 472} 473 474MAC_CHECK_PROBE_DEFINE3(vnode_check_exec, "struct ucred *", "struct vnode *", 475 "struct image_params *"); 476 477int 478mac_vnode_check_exec(struct ucred *cred, struct vnode *vp, 479 struct image_params *imgp) 480{ 481 int error; 482 483 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_exec"); 484 485 MAC_POLICY_CHECK(vnode_check_exec, cred, vp, vp->v_label, imgp, 486 imgp->execlabel); 487 MAC_CHECK_PROBE3(vnode_check_exec, error, cred, vp, imgp); 488 489 return (error); 490} 491 492MAC_CHECK_PROBE_DEFINE3(vnode_check_getacl, "struct ucred *", 493 "struct vnode *", "acl_type_t"); 494 495int 496mac_vnode_check_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 497{ 498 int error; 499 500 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getacl"); 501 502 MAC_POLICY_CHECK(vnode_check_getacl, cred, vp, vp->v_label, type); 503 MAC_CHECK_PROBE3(vnode_check_getacl, error, cred, vp, type); 504 505 return (error); 506} 507 508MAC_CHECK_PROBE_DEFINE4(vnode_check_getextattr, "struct ucred *", 509 "struct vnode *", "int", "const char *"); 510 511int 512mac_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 513 int attrnamespace, const char *name) 514{ 515 int error; 516 517 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getextattr"); 518 519 MAC_POLICY_CHECK(vnode_check_getextattr, cred, vp, vp->v_label, 520 attrnamespace, name); 521 MAC_CHECK_PROBE4(vnode_check_getextattr, error, cred, vp, 522 attrnamespace, name); 523 524 return (error); 525} 526 527MAC_CHECK_PROBE_DEFINE4(vnode_check_link, "struct ucred *", "struct vnode *", 528 "struct vnode *", "struct componentname *"); 529 530int 531mac_vnode_check_link(struct ucred *cred, struct vnode *dvp, 532 struct vnode *vp, struct componentname *cnp) 533{ 534 int error; 535 536 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_link"); 537 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_link"); 538 539 MAC_POLICY_CHECK(vnode_check_link, cred, dvp, dvp->v_label, vp, 540 vp->v_label, cnp); 541 MAC_CHECK_PROBE4(vnode_check_link, error, cred, dvp, vp, cnp); 542 543 return (error); 544} 545 546MAC_CHECK_PROBE_DEFINE3(vnode_check_listextattr, "struct ucred *", 547 "struct vnode *", "int"); 548 549int 550mac_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 551 int attrnamespace) 552{ 553 int error; 554 555 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_listextattr"); 556 557 MAC_POLICY_CHECK(vnode_check_listextattr, cred, vp, vp->v_label, 558 attrnamespace); 559 MAC_CHECK_PROBE3(vnode_check_listextattr, error, cred, vp, 560 attrnamespace); 561 562 return (error); 563} 564 565MAC_CHECK_PROBE_DEFINE3(vnode_check_lookup, "struct ucred *", 566 "struct vnode *", "struct componentname *"); 567 568int 569mac_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 570 struct componentname *cnp) 571{ 572 int error; 573 574 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_lookup"); 575 576 MAC_POLICY_CHECK(vnode_check_lookup, cred, dvp, dvp->v_label, cnp); 577 MAC_CHECK_PROBE3(vnode_check_lookup, error, cred, dvp, cnp); 578 579 return (error); 580} 581 582MAC_CHECK_PROBE_DEFINE4(vnode_check_mmap, "struct ucred *", "struct vnode *", 583 "int", "int"); 584 585int 586mac_vnode_check_mmap(struct ucred *cred, struct vnode *vp, int prot, 587 int flags) 588{ 589 int error; 590 591 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap"); 592 593 MAC_POLICY_CHECK(vnode_check_mmap, cred, vp, vp->v_label, prot, flags); 594 MAC_CHECK_PROBE4(vnode_check_mmap, error, cred, vp, prot, flags); 595 596 return (error); 597} 598 599void 600mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp, 601 int *prot) 602{ 603 int result = *prot; 604 605 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap_downgrade"); 606 607 MAC_POLICY_PERFORM(vnode_check_mmap_downgrade, cred, vp, vp->v_label, 608 &result); 609 610 *prot = result; 611} 612 613MAC_CHECK_PROBE_DEFINE3(vnode_check_mprotect, "struct ucred *", 614 "struct vnode *", "int"); 615 616int 617mac_vnode_check_mprotect(struct ucred *cred, struct vnode *vp, int prot) 618{ 619 int error; 620 621 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mprotect"); 622 623 MAC_POLICY_CHECK(vnode_check_mprotect, cred, vp, vp->v_label, prot); 624 MAC_CHECK_PROBE3(vnode_check_mprotect, error, cred, vp, prot); 625 626 return (error); 627} 628 629MAC_CHECK_PROBE_DEFINE3(vnode_check_open, "struct ucred *", "struct vnode *", 630 "accmode_t"); 631 632int 633mac_vnode_check_open(struct ucred *cred, struct vnode *vp, accmode_t accmode) 634{ 635 int error; 636 637 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_open"); 638 639 MAC_POLICY_CHECK(vnode_check_open, cred, vp, vp->v_label, accmode); 640 MAC_CHECK_PROBE3(vnode_check_open, error, cred, vp, accmode); 641 642 return (error); 643} 644 645MAC_CHECK_PROBE_DEFINE3(vnode_check_poll, "struct ucred *", "struct ucred *", 646 "struct vnode *"); 647 648int 649mac_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 650 struct vnode *vp) 651{ 652 int error; 653 654 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_poll"); 655 656 MAC_POLICY_CHECK(vnode_check_poll, active_cred, file_cred, vp, 657 vp->v_label); 658 MAC_CHECK_PROBE3(vnode_check_poll, error, active_cred, file_cred, 659 vp); 660 661 return (error); 662} 663 664MAC_CHECK_PROBE_DEFINE3(vnode_check_read, "struct ucred *", "struct ucred *", 665 "struct vnode *"); 666 667int 668mac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 669 struct vnode *vp) 670{ 671 int error; 672 673 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_read"); 674 675 MAC_POLICY_CHECK(vnode_check_read, active_cred, file_cred, vp, 676 vp->v_label); 677 MAC_CHECK_PROBE3(vnode_check_read, error, active_cred, file_cred, 678 vp); 679 680 return (error); 681} 682 683MAC_CHECK_PROBE_DEFINE2(vnode_check_readdir, "struct ucred *", 684 "struct vnode *"); 685 686int 687mac_vnode_check_readdir(struct ucred *cred, struct vnode *dvp) 688{ 689 int error; 690 691 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_readdir"); 692 693 MAC_POLICY_CHECK(vnode_check_readdir, cred, dvp, dvp->v_label); 694 MAC_CHECK_PROBE2(vnode_check_readdir, error, cred, dvp); 695 696 return (error); 697} 698 699MAC_CHECK_PROBE_DEFINE2(vnode_check_readlink, "struct ucred *", 700 "struct vnode *"); 701 702int 703mac_vnode_check_readlink(struct ucred *cred, struct vnode *vp) 704{ 705 int error; 706 707 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_readlink"); 708 709 MAC_POLICY_CHECK(vnode_check_readlink, cred, vp, vp->v_label); 710 MAC_CHECK_PROBE2(vnode_check_readlink, error, cred, vp); 711 712 return (error); 713} 714 715MAC_CHECK_PROBE_DEFINE3(vnode_check_relabel, "struct ucred *", 716 "struct vnode *", "struct label *"); 717 718static int 719mac_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 720 struct label *newlabel) 721{ 722 int error; 723 724 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_relabel"); 725 726 MAC_POLICY_CHECK(vnode_check_relabel, cred, vp, vp->v_label, newlabel); 727 MAC_CHECK_PROBE3(vnode_check_relabel, error, cred, vp, newlabel); 728 729 return (error); 730} 731 732MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_from, "struct ucred *", 733 "struct vnode *", "struct vnode *", "struct componentname *"); 734 735int 736mac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 737 struct vnode *vp, struct componentname *cnp) 738{ 739 int error; 740 741 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_from"); 742 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_from"); 743 744 MAC_POLICY_CHECK(vnode_check_rename_from, cred, dvp, dvp->v_label, vp, 745 vp->v_label, cnp); 746 MAC_CHECK_PROBE4(vnode_check_rename_from, error, cred, dvp, vp, cnp); 747 748 return (error); 749} 750 751MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_to, "struct ucred *", 752 "struct vnode *", "struct vnode *", "struct componentname *"); 753 754int 755mac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 756 struct vnode *vp, int samedir, struct componentname *cnp) 757{ 758 int error; 759 760 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_to"); 761 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_to"); 762 763 MAC_POLICY_CHECK(vnode_check_rename_to, cred, dvp, dvp->v_label, vp, 764 vp != NULL ? vp->v_label : NULL, samedir, cnp); 765 MAC_CHECK_PROBE4(vnode_check_rename_to, error, cred, dvp, vp, cnp); 766 return (error); 767} 768 769MAC_CHECK_PROBE_DEFINE2(vnode_check_revoke, "struct ucred *", 770 "struct vnode *"); 771 772int 773mac_vnode_check_revoke(struct ucred *cred, struct vnode *vp) 774{ 775 int error; 776 777 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_revoke"); 778 779 MAC_POLICY_CHECK(vnode_check_revoke, cred, vp, vp->v_label); 780 MAC_CHECK_PROBE2(vnode_check_revoke, error, cred, vp); 781 782 return (error); 783} 784 785MAC_CHECK_PROBE_DEFINE4(vnode_check_setacl, "struct ucred *", 786 "struct vnode *", "acl_type_t", "struct acl *"); 787 788int 789mac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 790 struct acl *acl) 791{ 792 int error; 793 794 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setacl"); 795 796 MAC_POLICY_CHECK(vnode_check_setacl, cred, vp, vp->v_label, type, acl); 797 MAC_CHECK_PROBE4(vnode_check_setacl, error, cred, vp, type, acl); 798 799 return (error); 800} 801 802MAC_CHECK_PROBE_DEFINE4(vnode_check_setextattr, "struct ucred *", 803 "struct vnode *", "int", "const char *"); 804 805int 806mac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 807 int attrnamespace, const char *name) 808{ 809 int error; 810 811 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setextattr"); 812 813 MAC_POLICY_CHECK(vnode_check_setextattr, cred, vp, vp->v_label, 814 attrnamespace, name); 815 MAC_CHECK_PROBE4(vnode_check_setextattr, error, cred, vp, 816 attrnamespace, name); 817 818 return (error); 819} 820 821MAC_CHECK_PROBE_DEFINE3(vnode_check_setflags, "struct ucred *", 822 "struct vnode *", "u_long"); 823 824int 825mac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 826{ 827 int error; 828 829 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setflags"); 830 831 MAC_POLICY_CHECK(vnode_check_setflags, cred, vp, vp->v_label, flags); 832 MAC_CHECK_PROBE3(vnode_check_setflags, error, cred, vp, flags); 833 834 return (error); 835} 836 837MAC_CHECK_PROBE_DEFINE3(vnode_check_setmode, "struct ucred *", 838 "struct vnode *", "mode_t"); 839 840int 841mac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 842{ 843 int error; 844 845 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setmode"); 846 847 MAC_POLICY_CHECK(vnode_check_setmode, cred, vp, vp->v_label, mode); 848 MAC_CHECK_PROBE3(vnode_check_setmode, error, cred, vp, mode); 849 850 return (error); 851} 852 853MAC_CHECK_PROBE_DEFINE4(vnode_check_setowner, "struct ucred *", 854 "struct vnode *", "uid_t", "gid_t"); 855 856int 857mac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 858 gid_t gid) 859{ 860 int error; 861 862 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setowner"); 863 864 MAC_POLICY_CHECK(vnode_check_setowner, cred, vp, vp->v_label, uid, gid); 865 MAC_CHECK_PROBE4(vnode_check_setowner, error, cred, vp, uid, gid); 866 867 return (error); 868} 869 870MAC_CHECK_PROBE_DEFINE4(vnode_check_setutimes, "struct ucred *", 871 "struct vnode *", "struct timespec *", "struct timespec *"); 872 873int 874mac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 875 struct timespec atime, struct timespec mtime) 876{ 877 int error; 878 879 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setutimes"); 880 881 MAC_POLICY_CHECK(vnode_check_setutimes, cred, vp, vp->v_label, atime, 882 mtime); 883 MAC_CHECK_PROBE4(vnode_check_setutimes, error, cred, vp, &atime, 884 &mtime); 885 886 return (error); 887} 888 889MAC_CHECK_PROBE_DEFINE3(vnode_check_stat, "struct ucred *", "struct ucred *", 890 "struct vnode *"); 891 892int 893mac_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 894 struct vnode *vp) 895{ 896 int error; 897 898 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_stat"); 899 900 MAC_POLICY_CHECK(vnode_check_stat, active_cred, file_cred, vp, 901 vp->v_label); 902 MAC_CHECK_PROBE3(vnode_check_stat, error, active_cred, file_cred, 903 vp); 904 905 return (error); 906} 907 908MAC_CHECK_PROBE_DEFINE4(vnode_check_unlink, "struct ucred *", 909 "struct vnode *", "struct vnode *", "struct componentname *"); 910 911int 912mac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 913 struct vnode *vp, struct componentname *cnp) 914{ 915 int error; 916 917 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_unlink"); 918 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_unlink"); 919 920 MAC_POLICY_CHECK(vnode_check_unlink, cred, dvp, dvp->v_label, vp, 921 vp->v_label, cnp); 922 MAC_CHECK_PROBE4(vnode_check_unlink, error, cred, dvp, vp, cnp); 923 924 return (error); 925} 926 927MAC_CHECK_PROBE_DEFINE3(vnode_check_write, "struct ucred *", 928 "struct ucred *", "struct vnode *"); 929 930int 931mac_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred, 932 struct vnode *vp) 933{ 934 int error; 935 936 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_write"); 937 938 MAC_POLICY_CHECK(vnode_check_write, active_cred, file_cred, vp, 939 vp->v_label); 940 MAC_CHECK_PROBE3(vnode_check_write, error, active_cred, file_cred, 941 vp); 942 943 return (error); 944} 945 946void 947mac_vnode_relabel(struct ucred *cred, struct vnode *vp, 948 struct label *newlabel) 949{ 950 951 MAC_POLICY_PERFORM(vnode_relabel, cred, vp, vp->v_label, newlabel); 952} 953 954void 955mac_mount_create(struct ucred *cred, struct mount *mp) 956{ 957 958 MAC_POLICY_PERFORM(mount_create, cred, mp, mp->mnt_label); 959} 960 961MAC_CHECK_PROBE_DEFINE2(mount_check_stat, "struct ucred *", 962 "struct mount *"); 963 964int 965mac_mount_check_stat(struct ucred *cred, struct mount *mount) 966{ 967 int error; 968 969 MAC_POLICY_CHECK_NOSLEEP(mount_check_stat, cred, mount, mount->mnt_label); 970 MAC_CHECK_PROBE2(mount_check_stat, error, cred, mount); 971 972 return (error); 973} 974 975void 976mac_devfs_create_device(struct ucred *cred, struct mount *mp, 977 struct cdev *dev, struct devfs_dirent *de) 978{ 979 980 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_device, cred, mp, dev, de, 981 de->de_label); 982} 983 984void 985mac_devfs_create_symlink(struct ucred *cred, struct mount *mp, 986 struct devfs_dirent *dd, struct devfs_dirent *de) 987{ 988 989 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_symlink, cred, mp, dd, 990 dd->de_label, de, de->de_label); 991} 992 993void 994mac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 995 struct devfs_dirent *de) 996{ 997 998 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_directory, mp, dirname, 999 dirnamelen, de, de->de_label); 1000} 1001 1002/* 1003 * Implementation of VOP_SETLABEL() that relies on extended attributes to 1004 * store label data. Can be referenced by filesystems supporting extended 1005 * attributes. 1006 */ 1007int 1008vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 1009{ 1010 struct vnode *vp = ap->a_vp; 1011 struct label *intlabel = ap->a_label; 1012 int error; 1013 1014 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 1015 1016 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 1017 return (EOPNOTSUPP); 1018 1019 error = mac_vnode_setlabel_extattr(ap->a_cred, vp, intlabel); 1020 if (error) 1021 return (error); 1022 1023 mac_vnode_relabel(ap->a_cred, vp, intlabel); 1024 1025 return (0); 1026} 1027 1028int 1029vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 1030{ 1031 int error; 1032 1033 if (vp->v_mount == NULL) { 1034 /* printf("vn_setlabel: null v_mount\n"); */ 1035 if (vp->v_type != VNON) 1036 printf("vn_setlabel: null v_mount with non-VNON\n"); 1037 return (EBADF); 1038 } 1039 1040 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 1041 return (EOPNOTSUPP); 1042 1043 /* 1044 * Multi-phase commit. First check the policies to confirm the 1045 * change is OK. Then commit via the filesystem. Finally, update 1046 * the actual vnode label. 1047 * 1048 * Question: maybe the filesystem should update the vnode at the end 1049 * as part of VOP_SETLABEL()? 1050 */ 1051 error = mac_vnode_check_relabel(cred, vp, intlabel); 1052 if (error) 1053 return (error); 1054 1055 /* 1056 * VADMIN provides the opportunity for the filesystem to make 1057 * decisions about who is and is not able to modify labels and 1058 * protections on files. This might not be right. We can't assume 1059 * VOP_SETLABEL() will do it, because we might implement that as part 1060 * of vop_stdsetlabel_ea(). 1061 */ 1062 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 1063 if (error) 1064 return (error); 1065 1066 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 1067 if (error) 1068 return (error); 1069 1070 return (0); 1071} 1072