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