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_setlabel_vnode_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(init_devfs_label, label); 90 return (label); 91 } 92 93 void 94 mac_init_devfs(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(init_mount_label, label); 107 return (label); 108 } 109 110 void 111 mac_init_mount(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(init_vnode_label, label); 124 return (label); 125 } 126 127 void 128 mac_init_vnode(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(destroy_devfs_label, label); 139 mac_labelzone_free(label); 140 } 141 142 void 143 mac_destroy_devfs(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(destroy_mount_label, label); 155 mac_labelzone_free(label); 156 } 157 158 void 159 mac_destroy_mount(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(destroy_vnode_label, label); 171 mac_labelzone_free(label); 172 } 173 174 void 175 mac_destroy_vnode(struct vnode *vp) 176 { 177 178 mac_vnode_label_free(vp->v_label); 179 vp->v_label = NULL; 180 } 181 182 void 183 mac_copy_vnode_label(struct label *src, struct label *dest) 184 { 185 186 MAC_PERFORM(copy_vnode_label, src, dest); 187 } 188 189 int 190 mac_externalize_vnode_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_internalize_vnode_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_update_devfs(struct mount *mp, struct devfs_dirent *de, struct vnode *vp) 212 { 213 214 MAC_PERFORM(update_devfs, mp, de, de->de_label, vp, vp->v_label); 215 } 216 217 void 218 mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de, 219 struct vnode *vp) 220 { 221 222 MAC_PERFORM(associate_vnode_devfs, mp, mp->mnt_label, de, 223 de->de_label, vp, vp->v_label); 224 } 225 226 int 227 mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp) 228 { 229 int error; 230 231 ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr"); 232 233 MAC_CHECK(associate_vnode_extattr, mp, mp->mnt_label, vp, 234 vp->v_label); 235 236 return (error); 237 } 238 239 void 240 mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp) 241 { 242 243 MAC_PERFORM(associate_vnode_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_create_vnode_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_create_vnode_extattr"); 263 ASSERT_VOP_LOCKED(vp, "mac_create_vnode_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(create_vnode_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_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 292 struct label *intlabel) 293 { 294 int error; 295 296 ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_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(setlabel_vnode_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_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, 324 struct label *interpvnodelabel, struct image_params *imgp) 325 { 326 327 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 328 329 MAC_PERFORM(execve_transition, old, new, vp, vp->v_label, 330 interpvnodelabel, imgp, imgp->execlabel); 331 } 332 333 int 334 mac_execve_will_transition(struct ucred *old, struct vnode *vp, 335 struct label *interpvnodelabel, struct image_params *imgp) 336 { 337 int result; 338 339 ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition"); 340 341 result = 0; 342 MAC_BOOLEAN(execve_will_transition, ||, old, vp, vp->v_label, 343 interpvnodelabel, imgp, imgp->execlabel); 344 345 return (result); 346 } 347 348 int 349 mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode) 350 { 351 int error; 352 353 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 354 355 MAC_CHECK(check_vnode_access, cred, vp, vp->v_label, acc_mode); 356 return (error); 357 } 358 359 int 360 mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 361 { 362 int error; 363 364 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 365 366 MAC_CHECK(check_vnode_chdir, cred, dvp, dvp->v_label); 367 return (error); 368 } 369 370 int 371 mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 372 { 373 int error; 374 375 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 376 377 MAC_CHECK(check_vnode_chroot, cred, dvp, dvp->v_label); 378 return (error); 379 } 380 381 int 382 mac_check_vnode_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_check_vnode_create"); 388 389 MAC_CHECK(check_vnode_create, cred, dvp, dvp->v_label, cnp, vap); 390 return (error); 391 } 392 393 int 394 mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 395 struct componentname *cnp) 396 { 397 int error; 398 399 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 400 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 401 402 MAC_CHECK(check_vnode_delete, cred, dvp, dvp->v_label, vp, 403 vp->v_label, cnp); 404 return (error); 405 } 406 407 int 408 mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 409 acl_type_t type) 410 { 411 int error; 412 413 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 414 415 MAC_CHECK(check_vnode_deleteacl, cred, vp, vp->v_label, type); 416 return (error); 417 } 418 419 int 420 mac_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp, 421 int attrnamespace, const char *name) 422 { 423 int error; 424 425 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr"); 426 427 MAC_CHECK(check_vnode_deleteextattr, cred, vp, vp->v_label, 428 attrnamespace, name); 429 return (error); 430 } 431 432 int 433 mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 434 struct image_params *imgp) 435 { 436 int error; 437 438 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 439 440 MAC_CHECK(check_vnode_exec, cred, vp, vp->v_label, imgp, 441 imgp->execlabel); 442 443 return (error); 444 } 445 446 int 447 mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 448 { 449 int error; 450 451 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 452 453 MAC_CHECK(check_vnode_getacl, cred, vp, vp->v_label, type); 454 return (error); 455 } 456 457 int 458 mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 459 int attrnamespace, const char *name, struct uio *uio) 460 { 461 int error; 462 463 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 464 465 MAC_CHECK(check_vnode_getextattr, cred, vp, vp->v_label, 466 attrnamespace, name, uio); 467 return (error); 468 } 469 470 int 471 mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 472 struct vnode *vp, struct componentname *cnp) 473 { 474 int error; 475 476 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 477 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 478 479 MAC_CHECK(check_vnode_link, cred, dvp, dvp->v_label, vp, 480 vp->v_label, cnp); 481 return (error); 482 } 483 484 int 485 mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp, 486 int attrnamespace) 487 { 488 int error; 489 490 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr"); 491 492 MAC_CHECK(check_vnode_listextattr, cred, vp, vp->v_label, 493 attrnamespace); 494 return (error); 495 } 496 497 int 498 mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 499 struct componentname *cnp) 500 { 501 int error; 502 503 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 504 505 MAC_CHECK(check_vnode_lookup, cred, dvp, dvp->v_label, cnp); 506 return (error); 507 } 508 509 int 510 mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 511 int prot, int flags) 512 { 513 int error; 514 515 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 516 517 MAC_CHECK(check_vnode_mmap, cred, vp, vp->v_label, prot, flags); 518 return (error); 519 } 520 521 void 522 mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 523 { 524 int result = *prot; 525 526 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 527 528 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, vp->v_label, 529 &result); 530 531 *prot = result; 532 } 533 534 int 535 mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 536 { 537 int error; 538 539 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 540 541 MAC_CHECK(check_vnode_mprotect, cred, vp, vp->v_label, prot); 542 return (error); 543 } 544 545 int 546 mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 547 { 548 int error; 549 550 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 551 552 MAC_CHECK(check_vnode_open, cred, vp, vp->v_label, acc_mode); 553 return (error); 554 } 555 556 int 557 mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 558 struct vnode *vp) 559 { 560 int error; 561 562 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 563 564 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 565 vp->v_label); 566 567 return (error); 568 } 569 570 int 571 mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 572 struct vnode *vp) 573 { 574 int error; 575 576 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 577 578 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 579 vp->v_label); 580 581 return (error); 582 } 583 584 int 585 mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 586 { 587 int error; 588 589 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 590 591 MAC_CHECK(check_vnode_readdir, cred, dvp, dvp->v_label); 592 return (error); 593 } 594 595 int 596 mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 597 { 598 int error; 599 600 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 601 602 MAC_CHECK(check_vnode_readlink, cred, vp, vp->v_label); 603 return (error); 604 } 605 606 static int 607 mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 608 struct label *newlabel) 609 { 610 int error; 611 612 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 613 614 MAC_CHECK(check_vnode_relabel, cred, vp, vp->v_label, newlabel); 615 616 return (error); 617 } 618 619 int 620 mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 621 struct vnode *vp, struct componentname *cnp) 622 { 623 int error; 624 625 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 626 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 627 628 MAC_CHECK(check_vnode_rename_from, cred, dvp, dvp->v_label, vp, 629 vp->v_label, cnp); 630 return (error); 631 } 632 633 int 634 mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 635 struct vnode *vp, int samedir, struct componentname *cnp) 636 { 637 int error; 638 639 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 640 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 641 642 MAC_CHECK(check_vnode_rename_to, cred, dvp, dvp->v_label, vp, 643 vp != NULL ? vp->v_label : NULL, samedir, cnp); 644 return (error); 645 } 646 647 int 648 mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 649 { 650 int error; 651 652 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 653 654 MAC_CHECK(check_vnode_revoke, cred, vp, vp->v_label); 655 return (error); 656 } 657 658 int 659 mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 660 struct acl *acl) 661 { 662 int error; 663 664 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 665 666 MAC_CHECK(check_vnode_setacl, cred, vp, vp->v_label, type, acl); 667 return (error); 668 } 669 670 int 671 mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 672 int attrnamespace, const char *name, struct uio *uio) 673 { 674 int error; 675 676 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 677 678 MAC_CHECK(check_vnode_setextattr, cred, vp, vp->v_label, 679 attrnamespace, name, uio); 680 return (error); 681 } 682 683 int 684 mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 685 { 686 int error; 687 688 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 689 690 MAC_CHECK(check_vnode_setflags, cred, vp, vp->v_label, flags); 691 return (error); 692 } 693 694 int 695 mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 696 { 697 int error; 698 699 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 700 701 MAC_CHECK(check_vnode_setmode, cred, vp, vp->v_label, mode); 702 return (error); 703 } 704 705 int 706 mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 707 gid_t gid) 708 { 709 int error; 710 711 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 712 713 MAC_CHECK(check_vnode_setowner, cred, vp, vp->v_label, uid, gid); 714 return (error); 715 } 716 717 int 718 mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 719 struct timespec atime, struct timespec mtime) 720 { 721 int error; 722 723 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 724 725 MAC_CHECK(check_vnode_setutimes, cred, vp, vp->v_label, atime, 726 mtime); 727 return (error); 728 } 729 730 int 731 mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 732 struct vnode *vp) 733 { 734 int error; 735 736 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 737 738 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 739 vp->v_label); 740 return (error); 741 } 742 743 int 744 mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 745 struct vnode *vp) 746 { 747 int error; 748 749 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 750 751 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 752 vp->v_label); 753 754 return (error); 755 } 756 757 void 758 mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 759 { 760 761 MAC_PERFORM(relabel_vnode, cred, vp, vp->v_label, newlabel); 762 } 763 764 void 765 mac_create_mount(struct ucred *cred, struct mount *mp) 766 { 767 768 MAC_PERFORM(create_mount, cred, mp, mp->mnt_label); 769 } 770 771 int 772 mac_check_mount_stat(struct ucred *cred, struct mount *mount) 773 { 774 int error; 775 776 MAC_CHECK(check_mount_stat, cred, mount, mount->mnt_label); 777 778 return (error); 779 } 780 781 void 782 mac_create_devfs_device(struct ucred *cred, struct mount *mp, 783 struct cdev *dev, struct devfs_dirent *de) 784 { 785 786 MAC_PERFORM(create_devfs_device, cred, mp, dev, de, de->de_label); 787 } 788 789 void 790 mac_create_devfs_symlink(struct ucred *cred, struct mount *mp, 791 struct devfs_dirent *dd, struct devfs_dirent *de) 792 { 793 794 MAC_PERFORM(create_devfs_symlink, cred, mp, dd, dd->de_label, de, 795 de->de_label); 796 } 797 798 void 799 mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen, 800 struct devfs_dirent *de) 801 { 802 803 MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de, 804 de->de_label); 805 } 806 807 /* 808 * Implementation of VOP_SETLABEL() that relies on extended attributes 809 * to store label data. Can be referenced by filesystems supporting 810 * extended attributes. 811 */ 812 int 813 vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 814 { 815 struct vnode *vp = ap->a_vp; 816 struct label *intlabel = ap->a_label; 817 int error; 818 819 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 820 821 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 822 return (EOPNOTSUPP); 823 824 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); 825 if (error) 826 return (error); 827 828 mac_relabel_vnode(ap->a_cred, vp, intlabel); 829 830 return (0); 831 } 832 833 int 834 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 835 { 836 int error; 837 838 if (vp->v_mount == NULL) { 839 /* printf("vn_setlabel: null v_mount\n"); */ 840 if (vp->v_type != VNON) 841 printf("vn_setlabel: null v_mount with non-VNON\n"); 842 return (EBADF); 843 } 844 845 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 846 return (EOPNOTSUPP); 847 848 /* 849 * Multi-phase commit. First check the policies to confirm the 850 * change is OK. Then commit via the filesystem. Finally, update 851 * the actual vnode label. 852 * 853 * Question: maybe the filesystem should update the vnode at the end 854 * as part of VOP_SETLABEL()? 855 */ 856 error = mac_check_vnode_relabel(cred, vp, intlabel); 857 if (error) 858 return (error); 859 860 /* 861 * VADMIN provides the opportunity for the filesystem to make 862 * decisions about who is and is not able to modify labels and 863 * protections on files. This might not be right. We can't assume 864 * VOP_SETLABEL() will do it, because we might implement that as 865 * part of vop_stdsetlabel_ea(). 866 */ 867 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 868 if (error) 869 return (error); 870 871 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 872 if (error) 873 return (error); 874 875 return (0); 876 } 877 878 /* 879 * When a thread becomes an NFS server daemon, its credential may need to be 880 * updated to reflect this so that policies can recognize when file system 881 * operations originate from the network. 882 * 883 * At some point, it would be desirable if the credential used for each NFS 884 * RPC could be set based on the RPC context (i.e., source system, etc) to 885 * provide more fine-grained access control. 886 */ 887 void 888 mac_associate_nfsd_label(struct ucred *cred) 889 { 890 891 MAC_PERFORM(associate_nfsd_label, cred); 892 } 893