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 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_devfsdirent_label_alloc(void) 85 { 86 struct label *label; 87 88 label = mac_labelzone_alloc(M_WAITOK); 89 MAC_PERFORM(init_devfsdirent_label, label); 90 return (label); 91 } 92 93 void 94 mac_init_devfsdirent(struct devfs_dirent *de) 95 { 96 97 de->de_label = mac_devfsdirent_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 static struct label * 111 mac_mount_fs_label_alloc(void) 112 { 113 struct label *label; 114 115 label = mac_labelzone_alloc(M_WAITOK); 116 MAC_PERFORM(init_mount_fs_label, label); 117 return (label); 118 } 119 120 void 121 mac_init_mount(struct mount *mp) 122 { 123 124 mp->mnt_mntlabel = mac_mount_label_alloc(); 125 mp->mnt_fslabel = mac_mount_fs_label_alloc(); 126 } 127 128 struct label * 129 mac_vnode_label_alloc(void) 130 { 131 struct label *label; 132 133 label = mac_labelzone_alloc(M_WAITOK); 134 MAC_PERFORM(init_vnode_label, label); 135 return (label); 136 } 137 138 void 139 mac_init_vnode(struct vnode *vp) 140 { 141 142 vp->v_label = mac_vnode_label_alloc(); 143 } 144 145 static void 146 mac_devfsdirent_label_free(struct label *label) 147 { 148 149 MAC_PERFORM(destroy_devfsdirent_label, label); 150 mac_labelzone_free(label); 151 } 152 153 void 154 mac_destroy_devfsdirent(struct devfs_dirent *de) 155 { 156 157 mac_devfsdirent_label_free(de->de_label); 158 de->de_label = NULL; 159 } 160 161 static void 162 mac_mount_label_free(struct label *label) 163 { 164 165 MAC_PERFORM(destroy_mount_label, label); 166 mac_labelzone_free(label); 167 } 168 169 static void 170 mac_mount_fs_label_free(struct label *label) 171 { 172 173 MAC_PERFORM(destroy_mount_fs_label, label); 174 mac_labelzone_free(label); 175 } 176 177 void 178 mac_destroy_mount(struct mount *mp) 179 { 180 181 mac_mount_fs_label_free(mp->mnt_fslabel); 182 mp->mnt_fslabel = NULL; 183 mac_mount_label_free(mp->mnt_mntlabel); 184 mp->mnt_mntlabel = NULL; 185 } 186 187 void 188 mac_vnode_label_free(struct label *label) 189 { 190 191 MAC_PERFORM(destroy_vnode_label, label); 192 mac_labelzone_free(label); 193 } 194 195 void 196 mac_destroy_vnode(struct vnode *vp) 197 { 198 199 mac_vnode_label_free(vp->v_label); 200 vp->v_label = NULL; 201 } 202 203 void 204 mac_copy_vnode_label(struct label *src, struct label *dest) 205 { 206 207 MAC_PERFORM(copy_vnode_label, src, dest); 208 } 209 210 int 211 mac_externalize_vnode_label(struct label *label, char *elements, 212 char *outbuf, size_t outbuflen) 213 { 214 int error; 215 216 MAC_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen); 217 218 return (error); 219 } 220 221 int 222 mac_internalize_vnode_label(struct label *label, char *string) 223 { 224 int error; 225 226 MAC_INTERNALIZE(vnode, label, string); 227 228 return (error); 229 } 230 231 void 232 mac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de, 233 struct vnode *vp) 234 { 235 236 MAC_PERFORM(update_devfsdirent, mp, de, de->de_label, vp, 237 vp->v_label); 238 } 239 240 void 241 mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de, 242 struct vnode *vp) 243 { 244 245 MAC_PERFORM(associate_vnode_devfs, mp, mp->mnt_fslabel, de, 246 de->de_label, vp, vp->v_label); 247 } 248 249 int 250 mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp) 251 { 252 int error; 253 254 ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr"); 255 256 MAC_CHECK(associate_vnode_extattr, mp, mp->mnt_fslabel, vp, 257 vp->v_label); 258 259 return (error); 260 } 261 262 void 263 mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp) 264 { 265 266 MAC_PERFORM(associate_vnode_singlelabel, mp, mp->mnt_fslabel, vp, 267 vp->v_label); 268 } 269 270 /* 271 * Functions implementing extended-attribute backed labels for file systems 272 * that support it. 273 * 274 * Where possible, we use EA transactions to make writes to multiple 275 * attributes across difference policies mutually atomic. We allow work to 276 * continue on file systems not supporting EA transactions, but generate a 277 * printf warning. 278 */ 279 int 280 mac_create_vnode_extattr(struct ucred *cred, struct mount *mp, 281 struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 282 { 283 int error; 284 285 ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr"); 286 ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr"); 287 288 error = VOP_OPENEXTATTR(vp, cred, curthread); 289 if (error == EOPNOTSUPP) { 290 if (ea_warn_once == 0) { 291 printf("Warning: transactions not supported " 292 "in EA write.\n"); 293 ea_warn_once = 1; 294 } 295 } else if (error) 296 return (error); 297 298 MAC_CHECK(create_vnode_extattr, cred, mp, mp->mnt_fslabel, 299 dvp, dvp->v_label, vp, vp->v_label, cnp); 300 301 if (error) { 302 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 303 return (error); 304 } 305 306 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 307 if (error == EOPNOTSUPP) 308 error = 0; 309 310 return (error); 311 } 312 313 static int 314 mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 315 struct label *intlabel) 316 { 317 int error; 318 319 ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr"); 320 321 error = VOP_OPENEXTATTR(vp, cred, curthread); 322 if (error == EOPNOTSUPP) { 323 if (ea_warn_once == 0) { 324 printf("Warning: transactions not supported " 325 "in EA write.\n"); 326 ea_warn_once = 1; 327 } 328 } else if (error) 329 return (error); 330 331 MAC_CHECK(setlabel_vnode_extattr, cred, vp, vp->v_label, 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 } 344 345 void 346 mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, 347 struct label *interpvnodelabel, struct image_params *imgp) 348 { 349 350 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 351 352 MAC_PERFORM(execve_transition, old, new, vp, vp->v_label, 353 interpvnodelabel, imgp, imgp->execlabel); 354 } 355 356 int 357 mac_execve_will_transition(struct ucred *old, struct vnode *vp, 358 struct label *interpvnodelabel, struct image_params *imgp) 359 { 360 int result; 361 362 ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition"); 363 364 result = 0; 365 MAC_BOOLEAN(execve_will_transition, ||, old, vp, vp->v_label, 366 interpvnodelabel, imgp, imgp->execlabel); 367 368 return (result); 369 } 370 371 int 372 mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode) 373 { 374 int error; 375 376 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 377 378 MAC_CHECK(check_vnode_access, cred, vp, vp->v_label, acc_mode); 379 return (error); 380 } 381 382 int 383 mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 384 { 385 int error; 386 387 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 388 389 MAC_CHECK(check_vnode_chdir, cred, dvp, dvp->v_label); 390 return (error); 391 } 392 393 int 394 mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 395 { 396 int error; 397 398 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 399 400 MAC_CHECK(check_vnode_chroot, cred, dvp, dvp->v_label); 401 return (error); 402 } 403 404 int 405 mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 406 struct componentname *cnp, struct vattr *vap) 407 { 408 int error; 409 410 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 411 412 MAC_CHECK(check_vnode_create, cred, dvp, dvp->v_label, cnp, vap); 413 return (error); 414 } 415 416 int 417 mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 418 struct componentname *cnp) 419 { 420 int error; 421 422 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 423 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 424 425 MAC_CHECK(check_vnode_delete, cred, dvp, dvp->v_label, vp, 426 vp->v_label, cnp); 427 return (error); 428 } 429 430 int 431 mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 432 acl_type_t type) 433 { 434 int error; 435 436 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 437 438 MAC_CHECK(check_vnode_deleteacl, cred, vp, vp->v_label, type); 439 return (error); 440 } 441 442 int 443 mac_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp, 444 int attrnamespace, const char *name) 445 { 446 int error; 447 448 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr"); 449 450 MAC_CHECK(check_vnode_deleteextattr, cred, vp, vp->v_label, 451 attrnamespace, name); 452 return (error); 453 } 454 455 int 456 mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 457 struct image_params *imgp) 458 { 459 int error; 460 461 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 462 463 MAC_CHECK(check_vnode_exec, cred, vp, vp->v_label, imgp, 464 imgp->execlabel); 465 466 return (error); 467 } 468 469 int 470 mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 471 { 472 int error; 473 474 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 475 476 MAC_CHECK(check_vnode_getacl, cred, vp, vp->v_label, type); 477 return (error); 478 } 479 480 int 481 mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 482 int attrnamespace, const char *name, struct uio *uio) 483 { 484 int error; 485 486 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 487 488 MAC_CHECK(check_vnode_getextattr, cred, vp, vp->v_label, 489 attrnamespace, name, uio); 490 return (error); 491 } 492 493 int 494 mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 495 struct vnode *vp, struct componentname *cnp) 496 { 497 int error; 498 499 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 500 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 501 502 MAC_CHECK(check_vnode_link, cred, dvp, dvp->v_label, vp, 503 vp->v_label, cnp); 504 return (error); 505 } 506 507 int 508 mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp, 509 int attrnamespace) 510 { 511 int error; 512 513 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr"); 514 515 MAC_CHECK(check_vnode_listextattr, cred, vp, vp->v_label, 516 attrnamespace); 517 return (error); 518 } 519 520 int 521 mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 522 struct componentname *cnp) 523 { 524 int error; 525 526 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 527 528 MAC_CHECK(check_vnode_lookup, cred, dvp, dvp->v_label, cnp); 529 return (error); 530 } 531 532 int 533 mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 534 int prot, int flags) 535 { 536 int error; 537 538 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 539 540 MAC_CHECK(check_vnode_mmap, cred, vp, vp->v_label, prot, flags); 541 return (error); 542 } 543 544 void 545 mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 546 { 547 int result = *prot; 548 549 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 550 551 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, vp->v_label, 552 &result); 553 554 *prot = result; 555 } 556 557 int 558 mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 559 { 560 int error; 561 562 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 563 564 MAC_CHECK(check_vnode_mprotect, cred, vp, vp->v_label, prot); 565 return (error); 566 } 567 568 int 569 mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 570 { 571 int error; 572 573 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 574 575 MAC_CHECK(check_vnode_open, cred, vp, vp->v_label, acc_mode); 576 return (error); 577 } 578 579 int 580 mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 581 struct vnode *vp) 582 { 583 int error; 584 585 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 586 587 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 588 vp->v_label); 589 590 return (error); 591 } 592 593 int 594 mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 595 struct vnode *vp) 596 { 597 int error; 598 599 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 600 601 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 602 vp->v_label); 603 604 return (error); 605 } 606 607 int 608 mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 609 { 610 int error; 611 612 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 613 614 MAC_CHECK(check_vnode_readdir, cred, dvp, dvp->v_label); 615 return (error); 616 } 617 618 int 619 mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 620 { 621 int error; 622 623 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 624 625 MAC_CHECK(check_vnode_readlink, cred, vp, vp->v_label); 626 return (error); 627 } 628 629 static int 630 mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 631 struct label *newlabel) 632 { 633 int error; 634 635 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 636 637 MAC_CHECK(check_vnode_relabel, cred, vp, vp->v_label, newlabel); 638 639 return (error); 640 } 641 642 int 643 mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 644 struct vnode *vp, struct componentname *cnp) 645 { 646 int error; 647 648 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 649 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 650 651 MAC_CHECK(check_vnode_rename_from, cred, dvp, dvp->v_label, vp, 652 vp->v_label, cnp); 653 return (error); 654 } 655 656 int 657 mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 658 struct vnode *vp, int samedir, struct componentname *cnp) 659 { 660 int error; 661 662 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 663 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 664 665 MAC_CHECK(check_vnode_rename_to, cred, dvp, dvp->v_label, vp, 666 vp != NULL ? vp->v_label : NULL, samedir, cnp); 667 return (error); 668 } 669 670 int 671 mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 672 { 673 int error; 674 675 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 676 677 MAC_CHECK(check_vnode_revoke, cred, vp, vp->v_label); 678 return (error); 679 } 680 681 int 682 mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 683 struct acl *acl) 684 { 685 int error; 686 687 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 688 689 MAC_CHECK(check_vnode_setacl, cred, vp, vp->v_label, type, acl); 690 return (error); 691 } 692 693 int 694 mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 695 int attrnamespace, const char *name, struct uio *uio) 696 { 697 int error; 698 699 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 700 701 MAC_CHECK(check_vnode_setextattr, cred, vp, vp->v_label, 702 attrnamespace, name, uio); 703 return (error); 704 } 705 706 int 707 mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 708 { 709 int error; 710 711 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 712 713 MAC_CHECK(check_vnode_setflags, cred, vp, vp->v_label, flags); 714 return (error); 715 } 716 717 int 718 mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 719 { 720 int error; 721 722 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 723 724 MAC_CHECK(check_vnode_setmode, cred, vp, vp->v_label, mode); 725 return (error); 726 } 727 728 int 729 mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 730 gid_t gid) 731 { 732 int error; 733 734 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 735 736 MAC_CHECK(check_vnode_setowner, cred, vp, vp->v_label, uid, gid); 737 return (error); 738 } 739 740 int 741 mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 742 struct timespec atime, struct timespec mtime) 743 { 744 int error; 745 746 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 747 748 MAC_CHECK(check_vnode_setutimes, cred, vp, vp->v_label, atime, 749 mtime); 750 return (error); 751 } 752 753 int 754 mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 755 struct vnode *vp) 756 { 757 int error; 758 759 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 760 761 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 762 vp->v_label); 763 return (error); 764 } 765 766 int 767 mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 768 struct vnode *vp) 769 { 770 int error; 771 772 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 773 774 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 775 vp->v_label); 776 777 return (error); 778 } 779 780 void 781 mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 782 { 783 784 MAC_PERFORM(relabel_vnode, cred, vp, vp->v_label, newlabel); 785 } 786 787 void 788 mac_create_mount(struct ucred *cred, struct mount *mp) 789 { 790 791 MAC_PERFORM(create_mount, cred, mp, mp->mnt_mntlabel, 792 mp->mnt_fslabel); 793 } 794 795 int 796 mac_check_mount_stat(struct ucred *cred, struct mount *mount) 797 { 798 int error; 799 800 MAC_CHECK(check_mount_stat, cred, mount, mount->mnt_mntlabel); 801 802 return (error); 803 } 804 805 void 806 mac_create_devfs_device(struct ucred *cred, struct mount *mp, 807 struct cdev *dev, struct devfs_dirent *de) 808 { 809 810 MAC_PERFORM(create_devfs_device, cred, mp, dev, de, de->de_label); 811 } 812 813 void 814 mac_create_devfs_symlink(struct ucred *cred, struct mount *mp, 815 struct devfs_dirent *dd, struct devfs_dirent *de) 816 { 817 818 MAC_PERFORM(create_devfs_symlink, cred, mp, dd, dd->de_label, de, 819 de->de_label); 820 } 821 822 void 823 mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen, 824 struct devfs_dirent *de) 825 { 826 827 MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de, 828 de->de_label); 829 } 830 831 /* 832 * Implementation of VOP_SETLABEL() that relies on extended attributes 833 * to store label data. Can be referenced by filesystems supporting 834 * extended attributes. 835 */ 836 int 837 vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 838 { 839 struct vnode *vp = ap->a_vp; 840 struct label *intlabel = ap->a_label; 841 int error; 842 843 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 844 845 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 846 return (EOPNOTSUPP); 847 848 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); 849 if (error) 850 return (error); 851 852 mac_relabel_vnode(ap->a_cred, vp, intlabel); 853 854 return (0); 855 } 856 857 int 858 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 859 { 860 int error; 861 862 if (vp->v_mount == NULL) { 863 /* printf("vn_setlabel: null v_mount\n"); */ 864 if (vp->v_type != VNON) 865 printf("vn_setlabel: null v_mount with non-VNON\n"); 866 return (EBADF); 867 } 868 869 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 870 return (EOPNOTSUPP); 871 872 /* 873 * Multi-phase commit. First check the policies to confirm the 874 * change is OK. Then commit via the filesystem. Finally, update 875 * the actual vnode label. 876 * 877 * Question: maybe the filesystem should update the vnode at the end 878 * as part of VOP_SETLABEL()? 879 */ 880 error = mac_check_vnode_relabel(cred, vp, intlabel); 881 if (error) 882 return (error); 883 884 /* 885 * VADMIN provides the opportunity for the filesystem to make 886 * decisions about who is and is not able to modify labels and 887 * protections on files. This might not be right. We can't assume 888 * VOP_SETLABEL() will do it, because we might implement that as 889 * part of vop_stdsetlabel_ea(). 890 */ 891 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 892 if (error) 893 return (error); 894 895 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 896 if (error) 897 return (error); 898 899 return (0); 900 } 901 902 /* 903 * When a thread becomes an NFS server daemon, its credential may need to be 904 * updated to reflect this so that policies can recognize when file system 905 * operations originate from the network. 906 * 907 * At some point, it would be desirable if the credential used for each NFS 908 * RPC could be set based on the RPC context (i.e., source system, etc) to 909 * provide more fine-grained access control. 910 */ 911 void 912 mac_associate_nfsd_label(struct ucred *cred) 913 { 914 915 MAC_PERFORM(associate_nfsd_label, cred); 916 } 917