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 */ 84 static int ea_warn_once = 0; 85 86 static int mac_vnode_setlabel_extattr(struct ucred *cred, 87 struct vnode *vp, struct label *intlabel); 88 89 static struct label * 90 mac_devfs_label_alloc(void) 91 { 92 struct label *label; 93 94 label = mac_labelzone_alloc(M_WAITOK); 95 MAC_PERFORM(devfs_init_label, label); 96 return (label); 97 } 98 99 void 100 mac_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 } 108 109 static struct label * 110 mac_mount_label_alloc(void) 111 { 112 struct label *label; 113 114 label = mac_labelzone_alloc(M_WAITOK); 115 MAC_PERFORM(mount_init_label, label); 116 return (label); 117 } 118 119 void 120 mac_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 } 128 129 struct label * 130 mac_vnode_label_alloc(void) 131 { 132 struct label *label; 133 134 label = mac_labelzone_alloc(M_WAITOK); 135 MAC_PERFORM(vnode_init_label, label); 136 return (label); 137 } 138 139 void 140 mac_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 } 148 149 static void 150 mac_devfs_label_free(struct label *label) 151 { 152 153 MAC_PERFORM_NOSLEEP(devfs_destroy_label, label); 154 mac_labelzone_free(label); 155 } 156 157 void 158 mac_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 } 166 167 static void 168 mac_mount_label_free(struct label *label) 169 { 170 171 MAC_PERFORM_NOSLEEP(mount_destroy_label, label); 172 mac_labelzone_free(label); 173 } 174 175 void 176 mac_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 } 184 185 void 186 mac_vnode_label_free(struct label *label) 187 { 188 189 MAC_PERFORM_NOSLEEP(vnode_destroy_label, label); 190 mac_labelzone_free(label); 191 } 192 193 void 194 mac_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 } 202 203 void 204 mac_vnode_copy_label(struct label *src, struct label *dest) 205 { 206 207 MAC_PERFORM_NOSLEEP(vnode_copy_label, src, dest); 208 } 209 210 int 211 mac_vnode_externalize_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_vnode_internalize_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_devfs_update(struct mount *mp, struct devfs_dirent *de, struct vnode *vp) 233 { 234 235 MAC_PERFORM_NOSLEEP(devfs_update, mp, de, de->de_label, vp, 236 vp->v_label); 237 } 238 239 void 240 mac_devfs_vnode_associate(struct mount *mp, struct devfs_dirent *de, 241 struct vnode *vp) 242 { 243 244 MAC_PERFORM_NOSLEEP(devfs_vnode_associate, mp, mp->mnt_label, de, 245 de->de_label, vp, vp->v_label); 246 } 247 248 int 249 mac_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_CHECK(vnode_associate_extattr, mp, mp->mnt_label, vp, 256 vp->v_label); 257 258 return (error); 259 } 260 261 void 262 mac_vnode_associate_singlelabel(struct mount *mp, struct vnode *vp) 263 { 264 265 MAC_PERFORM_NOSLEEP(vnode_associate_singlelabel, mp, mp->mnt_label, 266 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 */ 278 int 279 mac_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_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 } 311 312 static int 313 mac_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_CHECK(vnode_setlabel_extattr, cred, vp, vp->v_label, intlabel); 331 332 if (error) { 333 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 334 return (error); 335 } 336 337 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 338 if (error == EOPNOTSUPP) 339 error = 0; 340 341 return (error); 342 } 343 344 void 345 mac_vnode_execve_transition(struct ucred *old, struct ucred *new, 346 struct vnode *vp, struct label *interpvplabel, struct image_params *imgp) 347 { 348 349 ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_transition"); 350 351 MAC_PERFORM(vnode_execve_transition, old, new, vp, vp->v_label, 352 interpvplabel, imgp, imgp->execlabel); 353 } 354 355 int 356 mac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp, 357 struct label *interpvplabel, struct image_params *imgp) 358 { 359 int result; 360 361 ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_will_transition"); 362 363 result = 0; 364 /* No sleeping since the process lock will be held by the caller. */ 365 MAC_BOOLEAN_NOSLEEP(vnode_execve_will_transition, ||, old, vp, 366 vp->v_label, interpvplabel, imgp, imgp->execlabel); 367 368 return (result); 369 } 370 371 MAC_CHECK_PROBE_DEFINE3(vnode_check_access, "struct ucred *", 372 "struct vnode *", "accmode_t"); 373 374 int 375 mac_vnode_check_access(struct ucred *cred, struct vnode *vp, accmode_t accmode) 376 { 377 int error; 378 379 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_access"); 380 381 MAC_CHECK(vnode_check_access, cred, vp, vp->v_label, accmode); 382 MAC_CHECK_PROBE3(vnode_check_access, error, cred, vp, accmode); 383 384 return (error); 385 } 386 387 MAC_CHECK_PROBE_DEFINE2(vnode_check_chdir, "struct ucred *", 388 "struct vnode *"); 389 390 int 391 mac_vnode_check_chdir(struct ucred *cred, struct vnode *dvp) 392 { 393 int error; 394 395 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chdir"); 396 397 MAC_CHECK(vnode_check_chdir, cred, dvp, dvp->v_label); 398 MAC_CHECK_PROBE2(vnode_check_chdir, error, cred, dvp); 399 400 return (error); 401 } 402 403 MAC_CHECK_PROBE_DEFINE2(vnode_check_chroot, "struct ucred *", 404 "struct vnode *"); 405 406 int 407 mac_vnode_check_chroot(struct ucred *cred, struct vnode *dvp) 408 { 409 int error; 410 411 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chroot"); 412 413 MAC_CHECK(vnode_check_chroot, cred, dvp, dvp->v_label); 414 MAC_CHECK_PROBE2(vnode_check_chroot, error, cred, dvp); 415 416 return (error); 417 } 418 419 MAC_CHECK_PROBE_DEFINE4(vnode_check_create, "struct ucred *", 420 "struct vnode *", "struct componentname *", "struct vattr *"); 421 422 int 423 mac_vnode_check_create(struct ucred *cred, struct vnode *dvp, 424 struct componentname *cnp, struct vattr *vap) 425 { 426 int error; 427 428 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_create"); 429 430 MAC_CHECK(vnode_check_create, cred, dvp, dvp->v_label, cnp, vap); 431 MAC_CHECK_PROBE4(vnode_check_create, error, cred, dvp, cnp, vap); 432 433 return (error); 434 } 435 436 MAC_CHECK_PROBE_DEFINE3(vnode_check_deleteacl, "struct ucred *", 437 "struct vnode *", "acl_type_t"); 438 439 int 440 mac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 441 acl_type_t type) 442 { 443 int error; 444 445 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteacl"); 446 447 MAC_CHECK(vnode_check_deleteacl, cred, vp, vp->v_label, type); 448 MAC_CHECK_PROBE3(vnode_check_deleteacl, error, cred, vp, type); 449 450 return (error); 451 } 452 453 MAC_CHECK_PROBE_DEFINE4(vnode_check_deleteextattr, "struct ucred *", 454 "struct vnode *", "int", "const char *"); 455 456 int 457 mac_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 458 int attrnamespace, const char *name) 459 { 460 int error; 461 462 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteextattr"); 463 464 MAC_CHECK(vnode_check_deleteextattr, cred, vp, vp->v_label, 465 attrnamespace, name); 466 MAC_CHECK_PROBE4(vnode_check_deleteextattr, error, cred, vp, 467 attrnamespace, name); 468 469 return (error); 470 } 471 472 MAC_CHECK_PROBE_DEFINE3(vnode_check_exec, "struct ucred *", "struct vnode *", 473 "struct image_params *"); 474 475 int 476 mac_vnode_check_exec(struct ucred *cred, struct vnode *vp, 477 struct image_params *imgp) 478 { 479 int error; 480 481 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_exec"); 482 483 MAC_CHECK(vnode_check_exec, cred, vp, vp->v_label, imgp, 484 imgp->execlabel); 485 MAC_CHECK_PROBE3(vnode_check_exec, error, cred, vp, imgp); 486 487 return (error); 488 } 489 490 MAC_CHECK_PROBE_DEFINE3(vnode_check_getacl, "struct ucred *", 491 "struct vnode *", "acl_type_t"); 492 493 int 494 mac_vnode_check_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 495 { 496 int error; 497 498 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getacl"); 499 500 MAC_CHECK(vnode_check_getacl, cred, vp, vp->v_label, type); 501 MAC_CHECK_PROBE3(vnode_check_getacl, error, cred, vp, type); 502 503 return (error); 504 } 505 506 MAC_CHECK_PROBE_DEFINE4(vnode_check_getextattr, "struct ucred *", 507 "struct vnode *", "int", "const char *"); 508 509 int 510 mac_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 511 int attrnamespace, const char *name) 512 { 513 int error; 514 515 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getextattr"); 516 517 MAC_CHECK(vnode_check_getextattr, cred, vp, vp->v_label, 518 attrnamespace, name); 519 MAC_CHECK_PROBE4(vnode_check_getextattr, error, cred, vp, 520 attrnamespace, name); 521 522 return (error); 523 } 524 525 MAC_CHECK_PROBE_DEFINE4(vnode_check_link, "struct ucred *", "struct vnode *", 526 "struct vnode *", "struct componentname *"); 527 528 int 529 mac_vnode_check_link(struct ucred *cred, struct vnode *dvp, 530 struct vnode *vp, struct componentname *cnp) 531 { 532 int error; 533 534 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_link"); 535 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_link"); 536 537 MAC_CHECK(vnode_check_link, cred, dvp, dvp->v_label, vp, 538 vp->v_label, cnp); 539 MAC_CHECK_PROBE4(vnode_check_link, error, cred, dvp, vp, cnp); 540 541 return (error); 542 } 543 544 MAC_CHECK_PROBE_DEFINE3(vnode_check_listextattr, "struct ucred *", 545 "struct vnode *", "int"); 546 547 int 548 mac_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 549 int attrnamespace) 550 { 551 int error; 552 553 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_listextattr"); 554 555 MAC_CHECK(vnode_check_listextattr, cred, vp, vp->v_label, 556 attrnamespace); 557 MAC_CHECK_PROBE3(vnode_check_listextattr, error, cred, vp, 558 attrnamespace); 559 560 return (error); 561 } 562 563 MAC_CHECK_PROBE_DEFINE3(vnode_check_lookup, "struct ucred *", 564 "struct vnode *", "struct componentname *"); 565 566 int 567 mac_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 568 struct componentname *cnp) 569 { 570 int error; 571 572 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_lookup"); 573 574 MAC_CHECK(vnode_check_lookup, cred, dvp, dvp->v_label, cnp); 575 MAC_CHECK_PROBE3(vnode_check_lookup, error, cred, dvp, cnp); 576 577 return (error); 578 } 579 580 MAC_CHECK_PROBE_DEFINE4(vnode_check_mmap, "struct ucred *", "struct vnode *", 581 "int", "int"); 582 583 int 584 mac_vnode_check_mmap(struct ucred *cred, struct vnode *vp, int prot, 585 int flags) 586 { 587 int error; 588 589 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap"); 590 591 MAC_CHECK(vnode_check_mmap, cred, vp, vp->v_label, prot, flags); 592 MAC_CHECK_PROBE4(vnode_check_mmap, error, cred, vp, prot, flags); 593 594 return (error); 595 } 596 597 void 598 mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp, 599 int *prot) 600 { 601 int result = *prot; 602 603 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap_downgrade"); 604 605 MAC_PERFORM(vnode_check_mmap_downgrade, cred, vp, vp->v_label, 606 &result); 607 608 *prot = result; 609 } 610 611 MAC_CHECK_PROBE_DEFINE3(vnode_check_mprotect, "struct ucred *", 612 "struct vnode *", "int"); 613 614 int 615 mac_vnode_check_mprotect(struct ucred *cred, struct vnode *vp, int prot) 616 { 617 int error; 618 619 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mprotect"); 620 621 MAC_CHECK(vnode_check_mprotect, cred, vp, vp->v_label, prot); 622 MAC_CHECK_PROBE3(vnode_check_mprotect, error, cred, vp, prot); 623 624 return (error); 625 } 626 627 MAC_CHECK_PROBE_DEFINE3(vnode_check_open, "struct ucred *", "struct vnode *", 628 "accmode_t"); 629 630 int 631 mac_vnode_check_open(struct ucred *cred, struct vnode *vp, accmode_t accmode) 632 { 633 int error; 634 635 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_open"); 636 637 MAC_CHECK(vnode_check_open, cred, vp, vp->v_label, accmode); 638 return (error); 639 } 640 641 MAC_CHECK_PROBE_DEFINE3(vnode_check_poll, "struct ucred *", "struct ucred *", 642 "struct vnode *"); 643 644 int 645 mac_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 646 struct vnode *vp) 647 { 648 int error; 649 650 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_poll"); 651 652 MAC_CHECK(vnode_check_poll, active_cred, file_cred, vp, 653 vp->v_label); 654 MAC_CHECK_PROBE3(vnode_check_poll, error, active_cred, file_cred, 655 vp); 656 657 return (error); 658 } 659 660 MAC_CHECK_PROBE_DEFINE3(vnode_check_read, "struct ucred *", "struct ucred *", 661 "struct vnode *"); 662 663 int 664 mac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 665 struct vnode *vp) 666 { 667 int error; 668 669 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_read"); 670 671 MAC_CHECK(vnode_check_read, active_cred, file_cred, vp, 672 vp->v_label); 673 MAC_CHECK_PROBE3(vnode_check_read, error, active_cred, file_cred, 674 vp); 675 676 return (error); 677 } 678 679 MAC_CHECK_PROBE_DEFINE2(vnode_check_readdir, "struct ucred *", 680 "struct vnode *"); 681 682 int 683 mac_vnode_check_readdir(struct ucred *cred, struct vnode *dvp) 684 { 685 int error; 686 687 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_readdir"); 688 689 MAC_CHECK(vnode_check_readdir, cred, dvp, dvp->v_label); 690 MAC_CHECK_PROBE2(vnode_check_readdir, error, cred, dvp); 691 692 return (error); 693 } 694 695 MAC_CHECK_PROBE_DEFINE2(vnode_check_readlink, "struct ucred *", 696 "struct vnode *"); 697 698 int 699 mac_vnode_check_readlink(struct ucred *cred, struct vnode *vp) 700 { 701 int error; 702 703 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_readlink"); 704 705 MAC_CHECK(vnode_check_readlink, cred, vp, vp->v_label); 706 MAC_CHECK_PROBE2(vnode_check_readlink, error, cred, vp); 707 708 return (error); 709 } 710 711 MAC_CHECK_PROBE_DEFINE3(vnode_check_relabel, "struct ucred *", 712 "struct vnode *", "struct label *"); 713 714 static int 715 mac_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 716 struct label *newlabel) 717 { 718 int error; 719 720 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_relabel"); 721 722 MAC_CHECK(vnode_check_relabel, cred, vp, vp->v_label, newlabel); 723 MAC_CHECK_PROBE3(vnode_check_relabel, error, cred, vp, newlabel); 724 725 return (error); 726 } 727 728 MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_from, "struct ucred *", 729 "struct vnode *", "struct vnode *", "struct componentname *"); 730 731 int 732 mac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 733 struct vnode *vp, struct componentname *cnp) 734 { 735 int error; 736 737 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_from"); 738 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_from"); 739 740 MAC_CHECK(vnode_check_rename_from, cred, dvp, dvp->v_label, vp, 741 vp->v_label, cnp); 742 MAC_CHECK_PROBE4(vnode_check_rename_from, error, cred, dvp, vp, cnp); 743 744 return (error); 745 } 746 747 MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_to, "struct ucred *", 748 "struct vnode *", "struct vnode *", "struct componentname *"); 749 750 int 751 mac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 752 struct vnode *vp, int samedir, struct componentname *cnp) 753 { 754 int error; 755 756 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_to"); 757 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_to"); 758 759 MAC_CHECK(vnode_check_rename_to, cred, dvp, dvp->v_label, vp, 760 vp != NULL ? vp->v_label : NULL, samedir, cnp); 761 MAC_CHECK_PROBE4(vnode_check_rename_to, error, cred, dvp, vp, cnp); 762 return (error); 763 } 764 765 MAC_CHECK_PROBE_DEFINE2(vnode_check_revoke, "struct ucred *", 766 "struct vnode *"); 767 768 int 769 mac_vnode_check_revoke(struct ucred *cred, struct vnode *vp) 770 { 771 int error; 772 773 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_revoke"); 774 775 MAC_CHECK(vnode_check_revoke, cred, vp, vp->v_label); 776 MAC_CHECK_PROBE2(vnode_check_revoke, error, cred, vp); 777 778 return (error); 779 } 780 781 MAC_CHECK_PROBE_DEFINE4(vnode_check_setacl, "struct ucred *", 782 "struct vnode *", "acl_tpe_t", "struct acl *"); 783 784 int 785 mac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 786 struct acl *acl) 787 { 788 int error; 789 790 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setacl"); 791 792 MAC_CHECK(vnode_check_setacl, cred, vp, vp->v_label, type, acl); 793 MAC_CHECK_PROBE4(vnode_check_setacl, error, cred, vp, type, acl); 794 795 return (error); 796 } 797 798 MAC_CHECK_PROBE_DEFINE4(vnode_check_setextattr, "struct ucred *", 799 "struct vnode *", "int", "const char *"); 800 801 int 802 mac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 803 int attrnamespace, const char *name) 804 { 805 int error; 806 807 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setextattr"); 808 809 MAC_CHECK(vnode_check_setextattr, cred, vp, vp->v_label, 810 attrnamespace, name); 811 MAC_CHECK_PROBE4(vnode_check_setextattr, error, cred, vp, 812 attrnamespace, name); 813 814 return (error); 815 } 816 817 MAC_CHECK_PROBE_DEFINE3(vnode_check_setflags, "struct ucred *", 818 "struct vnode *", "u_long"); 819 820 int 821 mac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 822 { 823 int error; 824 825 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setflags"); 826 827 MAC_CHECK(vnode_check_setflags, cred, vp, vp->v_label, flags); 828 MAC_CHECK_PROBE3(vnode_check_setflags, error, cred, vp, flags); 829 830 return (error); 831 } 832 833 MAC_CHECK_PROBE_DEFINE3(vnode_check_setmode, "struct ucred *", 834 "struct vnode *", "mode_t"); 835 836 int 837 mac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 838 { 839 int error; 840 841 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setmode"); 842 843 MAC_CHECK(vnode_check_setmode, cred, vp, vp->v_label, mode); 844 MAC_CHECK_PROBE3(vnode_check_setmode, error, cred, vp, mode); 845 846 return (error); 847 } 848 849 MAC_CHECK_PROBE_DEFINE4(vnode_check_setowner, "struct ucred *", 850 "struct vnode *", "uid_t", "gid_t"); 851 852 int 853 mac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 854 gid_t gid) 855 { 856 int error; 857 858 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setowner"); 859 860 MAC_CHECK(vnode_check_setowner, cred, vp, vp->v_label, uid, gid); 861 MAC_CHECK_PROBE4(vnode_check_setowner, error, cred, vp, uid, gid); 862 863 return (error); 864 } 865 866 MAC_CHECK_PROBE_DEFINE4(vnode_check_setutimes, "struct ucred *", 867 "struct vnode *", "struct timespec *", "struct timespec *"); 868 869 int 870 mac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 871 struct timespec atime, struct timespec mtime) 872 { 873 int error; 874 875 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setutimes"); 876 877 MAC_CHECK(vnode_check_setutimes, cred, vp, vp->v_label, atime, 878 mtime); 879 MAC_CHECK_PROBE4(vnode_check_setutimes, error, cred, vp, &atime, 880 &mtime); 881 882 return (error); 883 } 884 885 MAC_CHECK_PROBE_DEFINE3(vnode_check_stat, "struct ucred *", "struct ucred *", 886 "struct vnode *"); 887 888 int 889 mac_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 890 struct vnode *vp) 891 { 892 int error; 893 894 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_stat"); 895 896 MAC_CHECK(vnode_check_stat, active_cred, file_cred, vp, 897 vp->v_label); 898 MAC_CHECK_PROBE3(vnode_check_stat, error, active_cred, file_cred, 899 vp); 900 901 return (error); 902 } 903 904 MAC_CHECK_PROBE_DEFINE4(vnode_check_unlink, "struct ucred *", 905 "struct vnode *", "struct vnode *", "struct componentname *"); 906 907 int 908 mac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 909 struct vnode *vp, struct componentname *cnp) 910 { 911 int error; 912 913 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_unlink"); 914 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_unlink"); 915 916 MAC_CHECK(vnode_check_unlink, cred, dvp, dvp->v_label, vp, 917 vp->v_label, cnp); 918 MAC_CHECK_PROBE4(vnode_check_unlink, error, cred, dvp, vp, cnp); 919 920 return (error); 921 } 922 923 MAC_CHECK_PROBE_DEFINE3(vnode_check_write, "struct ucred *", 924 "struct ucred *", "struct vnode *"); 925 926 int 927 mac_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred, 928 struct vnode *vp) 929 { 930 int error; 931 932 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_write"); 933 934 MAC_CHECK(vnode_check_write, active_cred, file_cred, vp, 935 vp->v_label); 936 MAC_CHECK_PROBE3(vnode_check_write, error, active_cred, file_cred, 937 vp); 938 939 return (error); 940 } 941 942 void 943 mac_vnode_relabel(struct ucred *cred, struct vnode *vp, 944 struct label *newlabel) 945 { 946 947 MAC_PERFORM(vnode_relabel, cred, vp, vp->v_label, newlabel); 948 } 949 950 void 951 mac_mount_create(struct ucred *cred, struct mount *mp) 952 { 953 954 MAC_PERFORM(mount_create, cred, mp, mp->mnt_label); 955 } 956 957 MAC_CHECK_PROBE_DEFINE2(mount_check_stat, "struct ucred *", 958 "struct mount *"); 959 960 int 961 mac_mount_check_stat(struct ucred *cred, struct mount *mount) 962 { 963 int error; 964 965 MAC_CHECK_NOSLEEP(mount_check_stat, cred, mount, mount->mnt_label); 966 MAC_CHECK_PROBE2(mount_check_stat, error, cred, mount); 967 968 return (error); 969 } 970 971 void 972 mac_devfs_create_device(struct ucred *cred, struct mount *mp, 973 struct cdev *dev, struct devfs_dirent *de) 974 { 975 976 MAC_PERFORM_NOSLEEP(devfs_create_device, cred, mp, dev, de, 977 de->de_label); 978 } 979 980 void 981 mac_devfs_create_symlink(struct ucred *cred, struct mount *mp, 982 struct devfs_dirent *dd, struct devfs_dirent *de) 983 { 984 985 MAC_PERFORM_NOSLEEP(devfs_create_symlink, cred, mp, dd, 986 dd->de_label, de, de->de_label); 987 } 988 989 void 990 mac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 991 struct devfs_dirent *de) 992 { 993 994 MAC_PERFORM_NOSLEEP(devfs_create_directory, mp, dirname, dirnamelen, 995 de, de->de_label); 996 } 997 998 /* 999 * Implementation of VOP_SETLABEL() that relies on extended attributes to 1000 * store label data. Can be referenced by filesystems supporting extended 1001 * attributes. 1002 */ 1003 int 1004 vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 1005 { 1006 struct vnode *vp = ap->a_vp; 1007 struct label *intlabel = ap->a_label; 1008 int error; 1009 1010 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 1011 1012 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 1013 return (EOPNOTSUPP); 1014 1015 error = mac_vnode_setlabel_extattr(ap->a_cred, vp, intlabel); 1016 if (error) 1017 return (error); 1018 1019 mac_vnode_relabel(ap->a_cred, vp, intlabel); 1020 1021 return (0); 1022 } 1023 1024 int 1025 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 1026 { 1027 int error; 1028 1029 if (vp->v_mount == NULL) { 1030 /* printf("vn_setlabel: null v_mount\n"); */ 1031 if (vp->v_type != VNON) 1032 printf("vn_setlabel: null v_mount with non-VNON\n"); 1033 return (EBADF); 1034 } 1035 1036 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 1037 return (EOPNOTSUPP); 1038 1039 /* 1040 * Multi-phase commit. First check the policies to confirm the 1041 * change is OK. Then commit via the filesystem. Finally, update 1042 * the actual vnode label. 1043 * 1044 * Question: maybe the filesystem should update the vnode at the end 1045 * as part of VOP_SETLABEL()? 1046 */ 1047 error = mac_vnode_check_relabel(cred, vp, intlabel); 1048 if (error) 1049 return (error); 1050 1051 /* 1052 * VADMIN provides the opportunity for the filesystem to make 1053 * decisions about who is and is not able to modify labels and 1054 * protections on files. This might not be right. We can't assume 1055 * VOP_SETLABEL() will do it, because we might implement that as part 1056 * of vop_stdsetlabel_ea(). 1057 */ 1058 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 1059 if (error) 1060 return (error); 1061 1062 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 1063 if (error) 1064 return (error); 1065 1066 return (0); 1067 } 1068