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_deleteacl(struct ucred *cred, struct vnode *vp, 395 acl_type_t type) 396 { 397 int error; 398 399 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 400 401 MAC_CHECK(check_vnode_deleteacl, cred, vp, vp->v_label, type); 402 return (error); 403 } 404 405 int 406 mac_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp, 407 int attrnamespace, const char *name) 408 { 409 int error; 410 411 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr"); 412 413 MAC_CHECK(check_vnode_deleteextattr, cred, vp, vp->v_label, 414 attrnamespace, name); 415 return (error); 416 } 417 418 int 419 mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 420 struct image_params *imgp) 421 { 422 int error; 423 424 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 425 426 MAC_CHECK(check_vnode_exec, cred, vp, vp->v_label, imgp, 427 imgp->execlabel); 428 429 return (error); 430 } 431 432 int 433 mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 434 { 435 int error; 436 437 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 438 439 MAC_CHECK(check_vnode_getacl, cred, vp, vp->v_label, type); 440 return (error); 441 } 442 443 int 444 mac_check_vnode_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_check_vnode_getextattr"); 450 451 MAC_CHECK(check_vnode_getextattr, cred, vp, vp->v_label, 452 attrnamespace, name, uio); 453 return (error); 454 } 455 456 int 457 mac_check_vnode_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_check_vnode_link"); 463 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 464 465 MAC_CHECK(check_vnode_link, cred, dvp, dvp->v_label, vp, 466 vp->v_label, cnp); 467 return (error); 468 } 469 470 int 471 mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp, 472 int attrnamespace) 473 { 474 int error; 475 476 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr"); 477 478 MAC_CHECK(check_vnode_listextattr, cred, vp, vp->v_label, 479 attrnamespace); 480 return (error); 481 } 482 483 int 484 mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 485 struct componentname *cnp) 486 { 487 int error; 488 489 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 490 491 MAC_CHECK(check_vnode_lookup, cred, dvp, dvp->v_label, cnp); 492 return (error); 493 } 494 495 int 496 mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 497 int prot, int flags) 498 { 499 int error; 500 501 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 502 503 MAC_CHECK(check_vnode_mmap, cred, vp, vp->v_label, prot, flags); 504 return (error); 505 } 506 507 void 508 mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 509 { 510 int result = *prot; 511 512 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 513 514 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, vp->v_label, 515 &result); 516 517 *prot = result; 518 } 519 520 int 521 mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 522 { 523 int error; 524 525 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 526 527 MAC_CHECK(check_vnode_mprotect, cred, vp, vp->v_label, prot); 528 return (error); 529 } 530 531 int 532 mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 533 { 534 int error; 535 536 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 537 538 MAC_CHECK(check_vnode_open, cred, vp, vp->v_label, acc_mode); 539 return (error); 540 } 541 542 int 543 mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 544 struct vnode *vp) 545 { 546 int error; 547 548 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 549 550 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 551 vp->v_label); 552 553 return (error); 554 } 555 556 int 557 mac_check_vnode_read(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_read"); 563 564 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 565 vp->v_label); 566 567 return (error); 568 } 569 570 int 571 mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 572 { 573 int error; 574 575 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 576 577 MAC_CHECK(check_vnode_readdir, cred, dvp, dvp->v_label); 578 return (error); 579 } 580 581 int 582 mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 583 { 584 int error; 585 586 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 587 588 MAC_CHECK(check_vnode_readlink, cred, vp, vp->v_label); 589 return (error); 590 } 591 592 static int 593 mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 594 struct label *newlabel) 595 { 596 int error; 597 598 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 599 600 MAC_CHECK(check_vnode_relabel, cred, vp, vp->v_label, newlabel); 601 602 return (error); 603 } 604 605 int 606 mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 607 struct vnode *vp, struct componentname *cnp) 608 { 609 int error; 610 611 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 612 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 613 614 MAC_CHECK(check_vnode_rename_from, cred, dvp, dvp->v_label, vp, 615 vp->v_label, cnp); 616 return (error); 617 } 618 619 int 620 mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 621 struct vnode *vp, int samedir, struct componentname *cnp) 622 { 623 int error; 624 625 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 626 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 627 628 MAC_CHECK(check_vnode_rename_to, cred, dvp, dvp->v_label, vp, 629 vp != NULL ? vp->v_label : NULL, samedir, cnp); 630 return (error); 631 } 632 633 int 634 mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 635 { 636 int error; 637 638 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 639 640 MAC_CHECK(check_vnode_revoke, cred, vp, vp->v_label); 641 return (error); 642 } 643 644 int 645 mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 646 struct acl *acl) 647 { 648 int error; 649 650 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 651 652 MAC_CHECK(check_vnode_setacl, cred, vp, vp->v_label, type, acl); 653 return (error); 654 } 655 656 int 657 mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 658 int attrnamespace, const char *name, struct uio *uio) 659 { 660 int error; 661 662 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 663 664 MAC_CHECK(check_vnode_setextattr, cred, vp, vp->v_label, 665 attrnamespace, name, uio); 666 return (error); 667 } 668 669 int 670 mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 671 { 672 int error; 673 674 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 675 676 MAC_CHECK(check_vnode_setflags, cred, vp, vp->v_label, flags); 677 return (error); 678 } 679 680 int 681 mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 682 { 683 int error; 684 685 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 686 687 MAC_CHECK(check_vnode_setmode, cred, vp, vp->v_label, mode); 688 return (error); 689 } 690 691 int 692 mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 693 gid_t gid) 694 { 695 int error; 696 697 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 698 699 MAC_CHECK(check_vnode_setowner, cred, vp, vp->v_label, uid, gid); 700 return (error); 701 } 702 703 int 704 mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 705 struct timespec atime, struct timespec mtime) 706 { 707 int error; 708 709 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 710 711 MAC_CHECK(check_vnode_setutimes, cred, vp, vp->v_label, atime, 712 mtime); 713 return (error); 714 } 715 716 int 717 mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 718 struct vnode *vp) 719 { 720 int error; 721 722 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 723 724 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 725 vp->v_label); 726 return (error); 727 } 728 729 int 730 mac_check_vnode_unlink(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 731 struct componentname *cnp) 732 { 733 int error; 734 735 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_unlink"); 736 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_unlink"); 737 738 MAC_CHECK(check_vnode_unlink, cred, dvp, dvp->v_label, vp, 739 vp->v_label, cnp); 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