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sys/security/mac_mls/mac_mls.c
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1 /*- 2 * Copyright (c) 1999-2002, 2007-2011 Robert N. M. Watson 3 * Copyright (c) 2001-2005 McAfee, Inc. 4 * Copyright (c) 2006 SPARTA, Inc. 5 * All rights reserved. 6 * 7 * This software was developed by Robert Watson for the TrustedBSD Project. 8 * 9 * This software was developed for the FreeBSD Project in part by McAfee 10 * Research, the Security Research Division of McAfee, Inc. under 11 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 12 * CHATS research program. 13 * 14 * This software was enhanced by SPARTA ISSO under SPAWAR contract 15 * N66001-04-C-6019 ("SEFOS"). 16 * 17 * This software was developed at the University of Cambridge Computer 18 * Laboratory with support from a grant from Google, Inc. 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 1. Redistributions of source code must retain the above copyright 24 * notice, this list of conditions and the following disclaimer. 25 * 2. Redistributions in binary form must reproduce the above copyright 26 * notice, this list of conditions and the following disclaimer in the 27 * documentation and/or other materials provided with the distribution. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * $FreeBSD: releng/11.0/sys/security/mac_mls/mac_mls.c 299187 2016-05-06 16:59:04Z pfg $ 42 */ 43 44 /* 45 * Developed by the TrustedBSD Project. 46 * 47 * MLS fixed label mandatory confidentiality policy. 48 */ 49 50 #include <sys/types.h> 51 #include <sys/param.h> 52 #include <sys/acl.h> 53 #include <sys/conf.h> 54 #include <sys/extattr.h> 55 #include <sys/kernel.h> 56 #include <sys/ksem.h> 57 #include <sys/mman.h> 58 #include <sys/malloc.h> 59 #include <sys/mount.h> 60 #include <sys/proc.h> 61 #include <sys/sbuf.h> 62 #include <sys/systm.h> 63 #include <sys/sysproto.h> 64 #include <sys/sysent.h> 65 #include <sys/systm.h> 66 #include <sys/vnode.h> 67 #include <sys/file.h> 68 #include <sys/socket.h> 69 #include <sys/socketvar.h> 70 #include <sys/pipe.h> 71 #include <sys/sx.h> 72 #include <sys/sysctl.h> 73 #include <sys/msg.h> 74 #include <sys/sem.h> 75 #include <sys/shm.h> 76 77 #include <fs/devfs/devfs.h> 78 79 #include <net/bpfdesc.h> 80 #include <net/if.h> 81 #include <net/if_types.h> 82 #include <net/if_var.h> 83 84 #include <netinet/in.h> 85 #include <netinet/in_pcb.h> 86 #include <netinet/ip_var.h> 87 88 #include <vm/uma.h> 89 #include <vm/vm.h> 90 91 #include <security/mac/mac_policy.h> 92 #include <security/mac_mls/mac_mls.h> 93 94 SYSCTL_DECL(_security_mac); 95 96 static SYSCTL_NODE(_security_mac, OID_AUTO, mls, CTLFLAG_RW, 0, 97 "TrustedBSD mac_mls policy controls"); 98 99 static int mls_label_size = sizeof(struct mac_mls); 100 SYSCTL_INT(_security_mac_mls, OID_AUTO, label_size, CTLFLAG_RD, 101 &mls_label_size, 0, "Size of struct mac_mls"); 102 103 static int mls_enabled = 1; 104 SYSCTL_INT(_security_mac_mls, OID_AUTO, enabled, CTLFLAG_RWTUN, &mls_enabled, 0, 105 "Enforce MAC/MLS policy"); 106 107 static int destroyed_not_inited; 108 SYSCTL_INT(_security_mac_mls, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 109 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 110 111 static int ptys_equal = 0; 112 SYSCTL_INT(_security_mac_mls, OID_AUTO, ptys_equal, CTLFLAG_RWTUN, 113 &ptys_equal, 0, "Label pty devices as mls/equal on create"); 114 115 static int revocation_enabled = 0; 116 SYSCTL_INT(_security_mac_mls, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN, 117 &revocation_enabled, 0, "Revoke access to objects on relabel"); 118 119 static int max_compartments = MAC_MLS_MAX_COMPARTMENTS; 120 SYSCTL_INT(_security_mac_mls, OID_AUTO, max_compartments, CTLFLAG_RD, 121 &max_compartments, 0, "Maximum compartments the policy supports"); 122 123 static int mls_slot; 124 #define SLOT(l) ((struct mac_mls *)mac_label_get((l), mls_slot)) 125 #define SLOT_SET(l, val) mac_label_set((l), mls_slot, (uintptr_t)(val)) 126 127 static uma_zone_t zone_mls; 128 129 static __inline int 130 mls_bit_set_empty(u_char *set) { 131 int i; 132 133 for (i = 0; i < MAC_MLS_MAX_COMPARTMENTS >> 3; i++) 134 if (set[i] != 0) 135 return (0); 136 return (1); 137 } 138 139 static struct mac_mls * 140 mls_alloc(int flag) 141 { 142 143 return (uma_zalloc(zone_mls, flag | M_ZERO)); 144 } 145 146 static void 147 mls_free(struct mac_mls *mm) 148 { 149 150 if (mm != NULL) 151 uma_zfree(zone_mls, mm); 152 else 153 atomic_add_int(&destroyed_not_inited, 1); 154 } 155 156 static int 157 mls_atmostflags(struct mac_mls *mm, int flags) 158 { 159 160 if ((mm->mm_flags & flags) != mm->mm_flags) 161 return (EINVAL); 162 return (0); 163 } 164 165 static int 166 mls_dominate_element(struct mac_mls_element *a, struct mac_mls_element *b) 167 { 168 int bit; 169 170 switch (a->mme_type) { 171 case MAC_MLS_TYPE_EQUAL: 172 case MAC_MLS_TYPE_HIGH: 173 return (1); 174 175 case MAC_MLS_TYPE_LOW: 176 switch (b->mme_type) { 177 case MAC_MLS_TYPE_LEVEL: 178 case MAC_MLS_TYPE_HIGH: 179 return (0); 180 181 case MAC_MLS_TYPE_EQUAL: 182 case MAC_MLS_TYPE_LOW: 183 return (1); 184 185 default: 186 panic("mls_dominate_element: b->mme_type invalid"); 187 } 188 189 case MAC_MLS_TYPE_LEVEL: 190 switch (b->mme_type) { 191 case MAC_MLS_TYPE_EQUAL: 192 case MAC_MLS_TYPE_LOW: 193 return (1); 194 195 case MAC_MLS_TYPE_HIGH: 196 return (0); 197 198 case MAC_MLS_TYPE_LEVEL: 199 for (bit = 1; bit <= MAC_MLS_MAX_COMPARTMENTS; bit++) 200 if (!MAC_MLS_BIT_TEST(bit, 201 a->mme_compartments) && 202 MAC_MLS_BIT_TEST(bit, b->mme_compartments)) 203 return (0); 204 return (a->mme_level >= b->mme_level); 205 206 default: 207 panic("mls_dominate_element: b->mme_type invalid"); 208 } 209 210 default: 211 panic("mls_dominate_element: a->mme_type invalid"); 212 } 213 214 return (0); 215 } 216 217 static int 218 mls_range_in_range(struct mac_mls *rangea, struct mac_mls *rangeb) 219 { 220 221 return (mls_dominate_element(&rangeb->mm_rangehigh, 222 &rangea->mm_rangehigh) && 223 mls_dominate_element(&rangea->mm_rangelow, 224 &rangeb->mm_rangelow)); 225 } 226 227 static int 228 mls_effective_in_range(struct mac_mls *effective, struct mac_mls *range) 229 { 230 231 KASSERT((effective->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0, 232 ("mls_effective_in_range: a not effective")); 233 KASSERT((range->mm_flags & MAC_MLS_FLAG_RANGE) != 0, 234 ("mls_effective_in_range: b not range")); 235 236 return (mls_dominate_element(&range->mm_rangehigh, 237 &effective->mm_effective) && 238 mls_dominate_element(&effective->mm_effective, 239 &range->mm_rangelow)); 240 241 return (1); 242 } 243 244 static int 245 mls_dominate_effective(struct mac_mls *a, struct mac_mls *b) 246 { 247 KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0, 248 ("mls_dominate_effective: a not effective")); 249 KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0, 250 ("mls_dominate_effective: b not effective")); 251 252 return (mls_dominate_element(&a->mm_effective, &b->mm_effective)); 253 } 254 255 static int 256 mls_equal_element(struct mac_mls_element *a, struct mac_mls_element *b) 257 { 258 259 if (a->mme_type == MAC_MLS_TYPE_EQUAL || 260 b->mme_type == MAC_MLS_TYPE_EQUAL) 261 return (1); 262 263 return (a->mme_type == b->mme_type && a->mme_level == b->mme_level); 264 } 265 266 static int 267 mls_equal_effective(struct mac_mls *a, struct mac_mls *b) 268 { 269 270 KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0, 271 ("mls_equal_effective: a not effective")); 272 KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0, 273 ("mls_equal_effective: b not effective")); 274 275 return (mls_equal_element(&a->mm_effective, &b->mm_effective)); 276 } 277 278 static int 279 mls_contains_equal(struct mac_mls *mm) 280 { 281 282 if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) 283 if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL) 284 return (1); 285 286 if (mm->mm_flags & MAC_MLS_FLAG_RANGE) { 287 if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL) 288 return (1); 289 if (mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL) 290 return (1); 291 } 292 293 return (0); 294 } 295 296 static int 297 mls_subject_privileged(struct mac_mls *mm) 298 { 299 300 KASSERT((mm->mm_flags & MAC_MLS_FLAGS_BOTH) == MAC_MLS_FLAGS_BOTH, 301 ("mls_subject_privileged: subject doesn't have both labels")); 302 303 /* If the effective is EQUAL, it's ok. */ 304 if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL) 305 return (0); 306 307 /* If either range endpoint is EQUAL, it's ok. */ 308 if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL || 309 mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL) 310 return (0); 311 312 /* If the range is low-high, it's ok. */ 313 if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_LOW && 314 mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_HIGH) 315 return (0); 316 317 /* It's not ok. */ 318 return (EPERM); 319 } 320 321 static int 322 mls_valid(struct mac_mls *mm) 323 { 324 325 if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) { 326 switch (mm->mm_effective.mme_type) { 327 case MAC_MLS_TYPE_LEVEL: 328 break; 329 330 case MAC_MLS_TYPE_EQUAL: 331 case MAC_MLS_TYPE_HIGH: 332 case MAC_MLS_TYPE_LOW: 333 if (mm->mm_effective.mme_level != 0 || 334 !MAC_MLS_BIT_SET_EMPTY( 335 mm->mm_effective.mme_compartments)) 336 return (EINVAL); 337 break; 338 339 default: 340 return (EINVAL); 341 } 342 } else { 343 if (mm->mm_effective.mme_type != MAC_MLS_TYPE_UNDEF) 344 return (EINVAL); 345 } 346 347 if (mm->mm_flags & MAC_MLS_FLAG_RANGE) { 348 switch (mm->mm_rangelow.mme_type) { 349 case MAC_MLS_TYPE_LEVEL: 350 break; 351 352 case MAC_MLS_TYPE_EQUAL: 353 case MAC_MLS_TYPE_HIGH: 354 case MAC_MLS_TYPE_LOW: 355 if (mm->mm_rangelow.mme_level != 0 || 356 !MAC_MLS_BIT_SET_EMPTY( 357 mm->mm_rangelow.mme_compartments)) 358 return (EINVAL); 359 break; 360 361 default: 362 return (EINVAL); 363 } 364 365 switch (mm->mm_rangehigh.mme_type) { 366 case MAC_MLS_TYPE_LEVEL: 367 break; 368 369 case MAC_MLS_TYPE_EQUAL: 370 case MAC_MLS_TYPE_HIGH: 371 case MAC_MLS_TYPE_LOW: 372 if (mm->mm_rangehigh.mme_level != 0 || 373 !MAC_MLS_BIT_SET_EMPTY( 374 mm->mm_rangehigh.mme_compartments)) 375 return (EINVAL); 376 break; 377 378 default: 379 return (EINVAL); 380 } 381 if (!mls_dominate_element(&mm->mm_rangehigh, 382 &mm->mm_rangelow)) 383 return (EINVAL); 384 } else { 385 if (mm->mm_rangelow.mme_type != MAC_MLS_TYPE_UNDEF || 386 mm->mm_rangehigh.mme_type != MAC_MLS_TYPE_UNDEF) 387 return (EINVAL); 388 } 389 390 return (0); 391 } 392 393 static void 394 mls_set_range(struct mac_mls *mm, u_short typelow, u_short levellow, 395 u_char *compartmentslow, u_short typehigh, u_short levelhigh, 396 u_char *compartmentshigh) 397 { 398 399 mm->mm_rangelow.mme_type = typelow; 400 mm->mm_rangelow.mme_level = levellow; 401 if (compartmentslow != NULL) 402 memcpy(mm->mm_rangelow.mme_compartments, compartmentslow, 403 sizeof(mm->mm_rangelow.mme_compartments)); 404 mm->mm_rangehigh.mme_type = typehigh; 405 mm->mm_rangehigh.mme_level = levelhigh; 406 if (compartmentshigh != NULL) 407 memcpy(mm->mm_rangehigh.mme_compartments, compartmentshigh, 408 sizeof(mm->mm_rangehigh.mme_compartments)); 409 mm->mm_flags |= MAC_MLS_FLAG_RANGE; 410 } 411 412 static void 413 mls_set_effective(struct mac_mls *mm, u_short type, u_short level, 414 u_char *compartments) 415 { 416 417 mm->mm_effective.mme_type = type; 418 mm->mm_effective.mme_level = level; 419 if (compartments != NULL) 420 memcpy(mm->mm_effective.mme_compartments, compartments, 421 sizeof(mm->mm_effective.mme_compartments)); 422 mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE; 423 } 424 425 static void 426 mls_copy_range(struct mac_mls *labelfrom, struct mac_mls *labelto) 427 { 428 429 KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_RANGE) != 0, 430 ("mls_copy_range: labelfrom not range")); 431 432 labelto->mm_rangelow = labelfrom->mm_rangelow; 433 labelto->mm_rangehigh = labelfrom->mm_rangehigh; 434 labelto->mm_flags |= MAC_MLS_FLAG_RANGE; 435 } 436 437 static void 438 mls_copy_effective(struct mac_mls *labelfrom, struct mac_mls *labelto) 439 { 440 441 KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0, 442 ("mls_copy_effective: labelfrom not effective")); 443 444 labelto->mm_effective = labelfrom->mm_effective; 445 labelto->mm_flags |= MAC_MLS_FLAG_EFFECTIVE; 446 } 447 448 static void 449 mls_copy(struct mac_mls *source, struct mac_mls *dest) 450 { 451 452 if (source->mm_flags & MAC_MLS_FLAG_EFFECTIVE) 453 mls_copy_effective(source, dest); 454 if (source->mm_flags & MAC_MLS_FLAG_RANGE) 455 mls_copy_range(source, dest); 456 } 457 458 /* 459 * Policy module operations. 460 */ 461 static void 462 mls_init(struct mac_policy_conf *conf) 463 { 464 465 zone_mls = uma_zcreate("mac_mls", sizeof(struct mac_mls), NULL, 466 NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 467 } 468 469 /* 470 * Label operations. 471 */ 472 static void 473 mls_init_label(struct label *label) 474 { 475 476 SLOT_SET(label, mls_alloc(M_WAITOK)); 477 } 478 479 static int 480 mls_init_label_waitcheck(struct label *label, int flag) 481 { 482 483 SLOT_SET(label, mls_alloc(flag)); 484 if (SLOT(label) == NULL) 485 return (ENOMEM); 486 487 return (0); 488 } 489 490 static void 491 mls_destroy_label(struct label *label) 492 { 493 494 mls_free(SLOT(label)); 495 SLOT_SET(label, NULL); 496 } 497 498 /* 499 * mls_element_to_string() accepts an sbuf and MLS element. It converts the 500 * MLS element to a string and stores the result in the sbuf; if there isn't 501 * space in the sbuf, -1 is returned. 502 */ 503 static int 504 mls_element_to_string(struct sbuf *sb, struct mac_mls_element *element) 505 { 506 int i, first; 507 508 switch (element->mme_type) { 509 case MAC_MLS_TYPE_HIGH: 510 return (sbuf_printf(sb, "high")); 511 512 case MAC_MLS_TYPE_LOW: 513 return (sbuf_printf(sb, "low")); 514 515 case MAC_MLS_TYPE_EQUAL: 516 return (sbuf_printf(sb, "equal")); 517 518 case MAC_MLS_TYPE_LEVEL: 519 if (sbuf_printf(sb, "%d", element->mme_level) == -1) 520 return (-1); 521 522 first = 1; 523 for (i = 1; i <= MAC_MLS_MAX_COMPARTMENTS; i++) { 524 if (MAC_MLS_BIT_TEST(i, element->mme_compartments)) { 525 if (first) { 526 if (sbuf_putc(sb, ':') == -1) 527 return (-1); 528 if (sbuf_printf(sb, "%d", i) == -1) 529 return (-1); 530 first = 0; 531 } else { 532 if (sbuf_printf(sb, "+%d", i) == -1) 533 return (-1); 534 } 535 } 536 } 537 return (0); 538 539 default: 540 panic("mls_element_to_string: invalid type (%d)", 541 element->mme_type); 542 } 543 } 544 545 /* 546 * mls_to_string() converts an MLS label to a string, and places the results 547 * in the passed sbuf. It returns 0 on success, or EINVAL if there isn't 548 * room in the sbuf. Note: the sbuf will be modified even in a failure case, 549 * so the caller may need to revert the sbuf by restoring the offset if 550 * that's undesired. 551 */ 552 static int 553 mls_to_string(struct sbuf *sb, struct mac_mls *mm) 554 { 555 556 if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) { 557 if (mls_element_to_string(sb, &mm->mm_effective) == -1) 558 return (EINVAL); 559 } 560 561 if (mm->mm_flags & MAC_MLS_FLAG_RANGE) { 562 if (sbuf_putc(sb, '(') == -1) 563 return (EINVAL); 564 565 if (mls_element_to_string(sb, &mm->mm_rangelow) == -1) 566 return (EINVAL); 567 568 if (sbuf_putc(sb, '-') == -1) 569 return (EINVAL); 570 571 if (mls_element_to_string(sb, &mm->mm_rangehigh) == -1) 572 return (EINVAL); 573 574 if (sbuf_putc(sb, ')') == -1) 575 return (EINVAL); 576 } 577 578 return (0); 579 } 580 581 static int 582 mls_externalize_label(struct label *label, char *element_name, 583 struct sbuf *sb, int *claimed) 584 { 585 struct mac_mls *mm; 586 587 if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0) 588 return (0); 589 590 (*claimed)++; 591 592 mm = SLOT(label); 593 594 return (mls_to_string(sb, mm)); 595 } 596 597 static int 598 mls_parse_element(struct mac_mls_element *element, char *string) 599 { 600 char *compartment, *end, *level; 601 int value; 602 603 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) { 604 element->mme_type = MAC_MLS_TYPE_HIGH; 605 element->mme_level = MAC_MLS_TYPE_UNDEF; 606 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) { 607 element->mme_type = MAC_MLS_TYPE_LOW; 608 element->mme_level = MAC_MLS_TYPE_UNDEF; 609 } else if (strcmp(string, "equal") == 0 || 610 strcmp(string, "eq") == 0) { 611 element->mme_type = MAC_MLS_TYPE_EQUAL; 612 element->mme_level = MAC_MLS_TYPE_UNDEF; 613 } else { 614 element->mme_type = MAC_MLS_TYPE_LEVEL; 615 616 /* 617 * Numeric level piece of the element. 618 */ 619 level = strsep(&string, ":"); 620 value = strtol(level, &end, 10); 621 if (end == level || *end != '\0') 622 return (EINVAL); 623 if (value < 0 || value > 65535) 624 return (EINVAL); 625 element->mme_level = value; 626 627 /* 628 * Optional compartment piece of the element. If none are 629 * included, we assume that the label has no compartments. 630 */ 631 if (string == NULL) 632 return (0); 633 if (*string == '\0') 634 return (0); 635 636 while ((compartment = strsep(&string, "+")) != NULL) { 637 value = strtol(compartment, &end, 10); 638 if (compartment == end || *end != '\0') 639 return (EINVAL); 640 if (value < 1 || value > MAC_MLS_MAX_COMPARTMENTS) 641 return (EINVAL); 642 MAC_MLS_BIT_SET(value, element->mme_compartments); 643 } 644 } 645 646 return (0); 647 } 648 649 /* 650 * Note: destructively consumes the string, make a local copy before calling 651 * if that's a problem. 652 */ 653 static int 654 mls_parse(struct mac_mls *mm, char *string) 655 { 656 char *rangehigh, *rangelow, *effective; 657 int error; 658 659 effective = strsep(&string, "("); 660 if (*effective == '\0') 661 effective = NULL; 662 663 if (string != NULL) { 664 rangelow = strsep(&string, "-"); 665 if (string == NULL) 666 return (EINVAL); 667 rangehigh = strsep(&string, ")"); 668 if (string == NULL) 669 return (EINVAL); 670 if (*string != '\0') 671 return (EINVAL); 672 } else { 673 rangelow = NULL; 674 rangehigh = NULL; 675 } 676 677 KASSERT((rangelow != NULL && rangehigh != NULL) || 678 (rangelow == NULL && rangehigh == NULL), 679 ("mls_parse: range mismatch")); 680 681 bzero(mm, sizeof(*mm)); 682 if (effective != NULL) { 683 error = mls_parse_element(&mm->mm_effective, effective); 684 if (error) 685 return (error); 686 mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE; 687 } 688 689 if (rangelow != NULL) { 690 error = mls_parse_element(&mm->mm_rangelow, rangelow); 691 if (error) 692 return (error); 693 error = mls_parse_element(&mm->mm_rangehigh, rangehigh); 694 if (error) 695 return (error); 696 mm->mm_flags |= MAC_MLS_FLAG_RANGE; 697 } 698 699 error = mls_valid(mm); 700 if (error) 701 return (error); 702 703 return (0); 704 } 705 706 static int 707 mls_internalize_label(struct label *label, char *element_name, 708 char *element_data, int *claimed) 709 { 710 struct mac_mls *mm, mm_temp; 711 int error; 712 713 if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0) 714 return (0); 715 716 (*claimed)++; 717 718 error = mls_parse(&mm_temp, element_data); 719 if (error) 720 return (error); 721 722 mm = SLOT(label); 723 *mm = mm_temp; 724 725 return (0); 726 } 727 728 static void 729 mls_copy_label(struct label *src, struct label *dest) 730 { 731 732 *SLOT(dest) = *SLOT(src); 733 } 734 735 /* 736 * Object-specific entry point implementations are sorted alphabetically by 737 * object type name and then by operation. 738 */ 739 static int 740 mls_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 741 struct ifnet *ifp, struct label *ifplabel) 742 { 743 struct mac_mls *a, *b; 744 745 if (!mls_enabled) 746 return (0); 747 748 a = SLOT(dlabel); 749 b = SLOT(ifplabel); 750 751 if (mls_equal_effective(a, b)) 752 return (0); 753 return (EACCES); 754 } 755 756 static void 757 mls_bpfdesc_create(struct ucred *cred, struct bpf_d *d, struct label *dlabel) 758 { 759 struct mac_mls *source, *dest; 760 761 source = SLOT(cred->cr_label); 762 dest = SLOT(dlabel); 763 764 mls_copy_effective(source, dest); 765 } 766 767 static void 768 mls_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, 769 struct mbuf *m, struct label *mlabel) 770 { 771 struct mac_mls *source, *dest; 772 773 source = SLOT(dlabel); 774 dest = SLOT(mlabel); 775 776 mls_copy_effective(source, dest); 777 } 778 779 static void 780 mls_cred_associate_nfsd(struct ucred *cred) 781 { 782 struct mac_mls *label; 783 784 label = SLOT(cred->cr_label); 785 mls_set_effective(label, MAC_MLS_TYPE_LOW, 0, NULL); 786 mls_set_range(label, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0, 787 NULL); 788 } 789 790 static int 791 mls_cred_check_relabel(struct ucred *cred, struct label *newlabel) 792 { 793 struct mac_mls *subj, *new; 794 int error; 795 796 subj = SLOT(cred->cr_label); 797 new = SLOT(newlabel); 798 799 /* 800 * If there is an MLS label update for the credential, it may be an 801 * update of effective, range, or both. 802 */ 803 error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH); 804 if (error) 805 return (error); 806 807 /* 808 * If the MLS label is to be changed, authorize as appropriate. 809 */ 810 if (new->mm_flags & MAC_MLS_FLAGS_BOTH) { 811 /* 812 * If the change request modifies both the MLS label 813 * effective and range, check that the new effective will be 814 * in the new range. 815 */ 816 if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) == 817 MAC_MLS_FLAGS_BOTH && !mls_effective_in_range(new, new)) 818 return (EINVAL); 819 820 /* 821 * To change the MLS effective label on a credential, the new 822 * effective label must be in the current range. 823 */ 824 if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE && 825 !mls_effective_in_range(new, subj)) 826 return (EPERM); 827 828 /* 829 * To change the MLS range label on a credential, the new 830 * range must be in the current range. 831 */ 832 if (new->mm_flags & MAC_MLS_FLAG_RANGE && 833 !mls_range_in_range(new, subj)) 834 return (EPERM); 835 836 /* 837 * To have EQUAL in any component of the new credential MLS 838 * label, the subject must already have EQUAL in their label. 839 */ 840 if (mls_contains_equal(new)) { 841 error = mls_subject_privileged(subj); 842 if (error) 843 return (error); 844 } 845 } 846 847 return (0); 848 } 849 850 static int 851 mls_cred_check_visible(struct ucred *cr1, struct ucred *cr2) 852 { 853 struct mac_mls *subj, *obj; 854 855 if (!mls_enabled) 856 return (0); 857 858 subj = SLOT(cr1->cr_label); 859 obj = SLOT(cr2->cr_label); 860 861 /* XXX: range */ 862 if (!mls_dominate_effective(subj, obj)) 863 return (ESRCH); 864 865 return (0); 866 } 867 868 static void 869 mls_cred_create_init(struct ucred *cred) 870 { 871 struct mac_mls *dest; 872 873 dest = SLOT(cred->cr_label); 874 875 mls_set_effective(dest, MAC_MLS_TYPE_LOW, 0, NULL); 876 mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0, 877 NULL); 878 } 879 880 static void 881 mls_cred_create_swapper(struct ucred *cred) 882 { 883 struct mac_mls *dest; 884 885 dest = SLOT(cred->cr_label); 886 887 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL); 888 mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0, 889 NULL); 890 } 891 892 static void 893 mls_cred_relabel(struct ucred *cred, struct label *newlabel) 894 { 895 struct mac_mls *source, *dest; 896 897 source = SLOT(newlabel); 898 dest = SLOT(cred->cr_label); 899 900 mls_copy(source, dest); 901 } 902 903 static void 904 mls_devfs_create_device(struct ucred *cred, struct mount *mp, 905 struct cdev *dev, struct devfs_dirent *de, struct label *delabel) 906 { 907 struct mac_mls *mm; 908 const char *dn; 909 int mls_type; 910 911 mm = SLOT(delabel); 912 dn = devtoname(dev); 913 if (strcmp(dn, "null") == 0 || 914 strcmp(dn, "zero") == 0 || 915 strcmp(dn, "random") == 0 || 916 strncmp(dn, "fd/", strlen("fd/")) == 0) 917 mls_type = MAC_MLS_TYPE_EQUAL; 918 else if (strcmp(dn, "kmem") == 0 || 919 strcmp(dn, "mem") == 0) 920 mls_type = MAC_MLS_TYPE_HIGH; 921 else if (ptys_equal && 922 (strncmp(dn, "ttyp", strlen("ttyp")) == 0 || 923 strncmp(dn, "pts/", strlen("pts/")) == 0 || 924 strncmp(dn, "ptyp", strlen("ptyp")) == 0)) 925 mls_type = MAC_MLS_TYPE_EQUAL; 926 else 927 mls_type = MAC_MLS_TYPE_LOW; 928 mls_set_effective(mm, mls_type, 0, NULL); 929 } 930 931 static void 932 mls_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 933 struct devfs_dirent *de, struct label *delabel) 934 { 935 struct mac_mls *mm; 936 937 mm = SLOT(delabel); 938 mls_set_effective(mm, MAC_MLS_TYPE_LOW, 0, NULL); 939 } 940 941 static void 942 mls_devfs_create_symlink(struct ucred *cred, struct mount *mp, 943 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 944 struct label *delabel) 945 { 946 struct mac_mls *source, *dest; 947 948 source = SLOT(cred->cr_label); 949 dest = SLOT(delabel); 950 951 mls_copy_effective(source, dest); 952 } 953 954 static void 955 mls_devfs_update(struct mount *mp, struct devfs_dirent *de, 956 struct label *delabel, struct vnode *vp, struct label *vplabel) 957 { 958 struct mac_mls *source, *dest; 959 960 source = SLOT(vplabel); 961 dest = SLOT(delabel); 962 963 mls_copy_effective(source, dest); 964 } 965 966 static void 967 mls_devfs_vnode_associate(struct mount *mp, struct label *mplabel, 968 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 969 struct label *vplabel) 970 { 971 struct mac_mls *source, *dest; 972 973 source = SLOT(delabel); 974 dest = SLOT(vplabel); 975 976 mls_copy_effective(source, dest); 977 } 978 979 static int 980 mls_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 981 struct label *ifplabel, struct label *newlabel) 982 { 983 struct mac_mls *subj, *new; 984 int error; 985 986 subj = SLOT(cred->cr_label); 987 new = SLOT(newlabel); 988 989 /* 990 * If there is an MLS label update for the interface, it may be an 991 * update of effective, range, or both. 992 */ 993 error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH); 994 if (error) 995 return (error); 996 997 /* 998 * Relabeling network interfaces requires MLS privilege. 999 */ 1000 return (mls_subject_privileged(subj)); 1001 } 1002 1003 static int 1004 mls_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1005 struct mbuf *m, struct label *mlabel) 1006 { 1007 struct mac_mls *p, *i; 1008 1009 if (!mls_enabled) 1010 return (0); 1011 1012 p = SLOT(mlabel); 1013 i = SLOT(ifplabel); 1014 1015 return (mls_effective_in_range(p, i) ? 0 : EACCES); 1016 } 1017 1018 static void 1019 mls_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1020 { 1021 struct mac_mls *dest; 1022 int type; 1023 1024 dest = SLOT(ifplabel); 1025 1026 if (ifp->if_type == IFT_LOOP) 1027 type = MAC_MLS_TYPE_EQUAL; 1028 else 1029 type = MAC_MLS_TYPE_LOW; 1030 1031 mls_set_effective(dest, type, 0, NULL); 1032 mls_set_range(dest, type, 0, NULL, type, 0, NULL); 1033 } 1034 1035 static void 1036 mls_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1037 struct mbuf *m, struct label *mlabel) 1038 { 1039 struct mac_mls *source, *dest; 1040 1041 source = SLOT(ifplabel); 1042 dest = SLOT(mlabel); 1043 1044 mls_copy_effective(source, dest); 1045 } 1046 1047 static void 1048 mls_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1049 struct label *ifplabel, struct label *newlabel) 1050 { 1051 struct mac_mls *source, *dest; 1052 1053 source = SLOT(newlabel); 1054 dest = SLOT(ifplabel); 1055 1056 mls_copy(source, dest); 1057 } 1058 1059 static int 1060 mls_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1061 struct mbuf *m, struct label *mlabel) 1062 { 1063 struct mac_mls *p, *i; 1064 1065 if (!mls_enabled) 1066 return (0); 1067 1068 p = SLOT(mlabel); 1069 i = SLOT(inplabel); 1070 1071 return (mls_equal_effective(p, i) ? 0 : EACCES); 1072 } 1073 1074 static int 1075 mls_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, 1076 struct label *inplabel) 1077 { 1078 struct mac_mls *subj, *obj; 1079 1080 if (!mls_enabled) 1081 return (0); 1082 1083 subj = SLOT(cred->cr_label); 1084 obj = SLOT(inplabel); 1085 1086 if (!mls_dominate_effective(subj, obj)) 1087 return (ENOENT); 1088 1089 return (0); 1090 } 1091 1092 static void 1093 mls_inpcb_create(struct socket *so, struct label *solabel, struct inpcb *inp, 1094 struct label *inplabel) 1095 { 1096 struct mac_mls *source, *dest; 1097 1098 source = SLOT(solabel); 1099 dest = SLOT(inplabel); 1100 1101 mls_copy_effective(source, dest); 1102 } 1103 1104 static void 1105 mls_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1106 struct mbuf *m, struct label *mlabel) 1107 { 1108 struct mac_mls *source, *dest; 1109 1110 source = SLOT(inplabel); 1111 dest = SLOT(mlabel); 1112 1113 mls_copy_effective(source, dest); 1114 } 1115 1116 static void 1117 mls_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1118 struct inpcb *inp, struct label *inplabel) 1119 { 1120 struct mac_mls *source, *dest; 1121 1122 SOCK_LOCK_ASSERT(so); 1123 1124 source = SLOT(solabel); 1125 dest = SLOT(inplabel); 1126 1127 mls_copy(source, dest); 1128 } 1129 1130 static void 1131 mls_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1132 struct label *q6label) 1133 { 1134 struct mac_mls *source, *dest; 1135 1136 source = SLOT(mlabel); 1137 dest = SLOT(q6label); 1138 1139 mls_copy_effective(source, dest); 1140 } 1141 1142 static int 1143 mls_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1144 struct label *q6label) 1145 { 1146 struct mac_mls *a, *b; 1147 1148 a = SLOT(q6label); 1149 b = SLOT(mlabel); 1150 1151 return (mls_equal_effective(a, b)); 1152 } 1153 1154 static void 1155 mls_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, 1156 struct label *mlabel) 1157 { 1158 struct mac_mls *source, *dest; 1159 1160 source = SLOT(q6label); 1161 dest = SLOT(mlabel); 1162 1163 /* Just use the head, since we require them all to match. */ 1164 mls_copy_effective(source, dest); 1165 } 1166 1167 static void 1168 mls_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1169 struct label *q6label) 1170 { 1171 1172 /* NOOP: we only accept matching labels, so no need to update */ 1173 } 1174 1175 static void 1176 mls_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, 1177 struct label *qlabel) 1178 { 1179 struct mac_mls *source, *dest; 1180 1181 source = SLOT(mlabel); 1182 dest = SLOT(qlabel); 1183 1184 mls_copy_effective(source, dest); 1185 } 1186 1187 static int 1188 mls_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, 1189 struct label *qlabel) 1190 { 1191 struct mac_mls *a, *b; 1192 1193 a = SLOT(qlabel); 1194 b = SLOT(mlabel); 1195 1196 return (mls_equal_effective(a, b)); 1197 } 1198 1199 static void 1200 mls_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, 1201 struct label *mlabel) 1202 { 1203 struct mac_mls *source, *dest; 1204 1205 source = SLOT(qlabel); 1206 dest = SLOT(mlabel); 1207 1208 /* Just use the head, since we require them all to match. */ 1209 mls_copy_effective(source, dest); 1210 } 1211 1212 static void 1213 mls_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, 1214 struct label *qlabel) 1215 { 1216 1217 /* NOOP: we only accept matching labels, so no need to update */ 1218 } 1219 1220 static int 1221 mls_mount_check_stat(struct ucred *cred, struct mount *mp, 1222 struct label *mntlabel) 1223 { 1224 struct mac_mls *subj, *obj; 1225 1226 if (!mls_enabled) 1227 return (0); 1228 1229 subj = SLOT(cred->cr_label); 1230 obj = SLOT(mntlabel); 1231 1232 if (!mls_dominate_effective(subj, obj)) 1233 return (EACCES); 1234 1235 return (0); 1236 } 1237 1238 static void 1239 mls_mount_create(struct ucred *cred, struct mount *mp, struct label *mplabel) 1240 { 1241 struct mac_mls *source, *dest; 1242 1243 source = SLOT(cred->cr_label); 1244 dest = SLOT(mplabel); 1245 1246 mls_copy_effective(source, dest); 1247 } 1248 1249 static void 1250 mls_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1251 struct mbuf *m, struct label *mlabel) 1252 { 1253 struct mac_mls *dest; 1254 1255 dest = SLOT(mlabel); 1256 1257 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL); 1258 } 1259 1260 static void 1261 mls_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1262 struct mbuf *msend, struct label *msendlabel) 1263 { 1264 struct mac_mls *source, *dest; 1265 1266 source = SLOT(mrecvlabel); 1267 dest = SLOT(msendlabel); 1268 1269 mls_copy_effective(source, dest); 1270 } 1271 1272 static void 1273 mls_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1274 { 1275 struct mac_mls *dest; 1276 1277 dest = SLOT(mlabel); 1278 1279 /* XXX: where is the label for the firewall really coming from? */ 1280 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL); 1281 } 1282 1283 static void 1284 mls_netinet_fragment(struct mbuf *m, struct label *mlabel, struct mbuf *frag, 1285 struct label *fraglabel) 1286 { 1287 struct mac_mls *source, *dest; 1288 1289 source = SLOT(mlabel); 1290 dest = SLOT(fraglabel); 1291 1292 mls_copy_effective(source, dest); 1293 } 1294 1295 static void 1296 mls_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1297 struct mbuf *msend, struct label *msendlabel) 1298 { 1299 struct mac_mls *source, *dest; 1300 1301 source = SLOT(mrecvlabel); 1302 dest = SLOT(msendlabel); 1303 1304 mls_copy_effective(source, dest); 1305 } 1306 1307 static void 1308 mls_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1309 struct mbuf *m, struct label *mlabel) 1310 { 1311 struct mac_mls *dest; 1312 1313 dest = SLOT(mlabel); 1314 1315 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL); 1316 } 1317 1318 static void 1319 mls_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1320 struct mbuf *m, struct label *mlabel) 1321 { 1322 struct mac_mls *dest; 1323 1324 dest = SLOT(mlabel); 1325 1326 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL); 1327 } 1328 1329 static int 1330 mls_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1331 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1332 { 1333 1334 if (!mls_enabled) 1335 return (0); 1336 1337 /* XXX: This will be implemented soon... */ 1338 1339 return (0); 1340 } 1341 1342 static int 1343 mls_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1344 struct label *pplabel) 1345 { 1346 struct mac_mls *subj, *obj; 1347 1348 if (!mls_enabled) 1349 return (0); 1350 1351 subj = SLOT(cred->cr_label); 1352 obj = SLOT(pplabel); 1353 1354 if (!mls_dominate_effective(subj, obj)) 1355 return (EACCES); 1356 1357 return (0); 1358 } 1359 1360 static int 1361 mls_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1362 struct label *pplabel) 1363 { 1364 struct mac_mls *subj, *obj; 1365 1366 if (!mls_enabled) 1367 return (0); 1368 1369 subj = SLOT(cred->cr_label); 1370 obj = SLOT(pplabel); 1371 1372 if (!mls_dominate_effective(subj, obj)) 1373 return (EACCES); 1374 1375 return (0); 1376 } 1377 1378 static int 1379 mls_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1380 struct label *pplabel, struct label *newlabel) 1381 { 1382 struct mac_mls *subj, *obj, *new; 1383 int error; 1384 1385 new = SLOT(newlabel); 1386 subj = SLOT(cred->cr_label); 1387 obj = SLOT(pplabel); 1388 1389 /* 1390 * If there is an MLS label update for a pipe, it must be a effective 1391 * update. 1392 */ 1393 error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE); 1394 if (error) 1395 return (error); 1396 1397 /* 1398 * To perform a relabel of a pipe (MLS label or not), MLS must 1399 * authorize the relabel. 1400 */ 1401 if (!mls_effective_in_range(obj, subj)) 1402 return (EPERM); 1403 1404 /* 1405 * If the MLS label is to be changed, authorize as appropriate. 1406 */ 1407 if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) { 1408 /* 1409 * To change the MLS label on a pipe, the new pipe label must 1410 * be in the subject range. 1411 */ 1412 if (!mls_effective_in_range(new, subj)) 1413 return (EPERM); 1414 1415 /* 1416 * To change the MLS label on a pipe to be EQUAL, the subject 1417 * must have appropriate privilege. 1418 */ 1419 if (mls_contains_equal(new)) { 1420 error = mls_subject_privileged(subj); 1421 if (error) 1422 return (error); 1423 } 1424 } 1425 1426 return (0); 1427 } 1428 1429 static int 1430 mls_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 1431 struct label *pplabel) 1432 { 1433 struct mac_mls *subj, *obj; 1434 1435 if (!mls_enabled) 1436 return (0); 1437 1438 subj = SLOT(cred->cr_label); 1439 obj = SLOT(pplabel); 1440 1441 if (!mls_dominate_effective(subj, obj)) 1442 return (EACCES); 1443 1444 return (0); 1445 } 1446 1447 static int 1448 mls_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1449 struct label *pplabel) 1450 { 1451 struct mac_mls *subj, *obj; 1452 1453 if (!mls_enabled) 1454 return (0); 1455 1456 subj = SLOT(cred->cr_label); 1457 obj = SLOT(pplabel); 1458 1459 if (!mls_dominate_effective(obj, subj)) 1460 return (EACCES); 1461 1462 return (0); 1463 } 1464 1465 static void 1466 mls_pipe_create(struct ucred *cred, struct pipepair *pp, 1467 struct label *pplabel) 1468 { 1469 struct mac_mls *source, *dest; 1470 1471 source = SLOT(cred->cr_label); 1472 dest = SLOT(pplabel); 1473 1474 mls_copy_effective(source, dest); 1475 } 1476 1477 static void 1478 mls_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1479 struct label *pplabel, struct label *newlabel) 1480 { 1481 struct mac_mls *source, *dest; 1482 1483 source = SLOT(newlabel); 1484 dest = SLOT(pplabel); 1485 1486 mls_copy(source, dest); 1487 } 1488 1489 static int 1490 mls_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks, 1491 struct label *kslabel) 1492 { 1493 struct mac_mls *subj, *obj; 1494 1495 if (!mls_enabled) 1496 return (0); 1497 1498 subj = SLOT(cred->cr_label); 1499 obj = SLOT(kslabel); 1500 1501 if (!mls_dominate_effective(obj, subj)) 1502 return (EACCES); 1503 1504 return (0); 1505 } 1506 1507 static int 1508 mls_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred, 1509 struct ksem *ks, struct label *kslabel) 1510 { 1511 struct mac_mls *subj, *obj; 1512 1513 if (!mls_enabled) 1514 return (0); 1515 1516 subj = SLOT(active_cred->cr_label); 1517 obj = SLOT(kslabel); 1518 1519 if (!mls_dominate_effective(subj, obj)) 1520 return (EACCES); 1521 1522 return (0); 1523 } 1524 1525 static int 1526 mls_posixsem_check_setmode(struct ucred *cred, struct ksem *ks, 1527 struct label *shmlabel, mode_t mode) 1528 { 1529 struct mac_mls *subj, *obj; 1530 1531 if (!mls_enabled) 1532 return (0); 1533 1534 subj = SLOT(cred->cr_label); 1535 obj = SLOT(shmlabel); 1536 1537 if (!mls_dominate_effective(obj, subj)) 1538 return (EACCES); 1539 1540 return (0); 1541 } 1542 1543 static int 1544 mls_posixsem_check_setowner(struct ucred *cred, struct ksem *ks, 1545 struct label *shmlabel, uid_t uid, gid_t gid) 1546 { 1547 struct mac_mls *subj, *obj; 1548 1549 if (!mls_enabled) 1550 return (0); 1551 1552 subj = SLOT(cred->cr_label); 1553 obj = SLOT(shmlabel); 1554 1555 if (!mls_dominate_effective(obj, subj)) 1556 return (EACCES); 1557 1558 return (0); 1559 } 1560 1561 static int 1562 mls_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred, 1563 struct ksem *ks, struct label *kslabel) 1564 { 1565 struct mac_mls *subj, *obj; 1566 1567 if (!mls_enabled) 1568 return (0); 1569 1570 subj = SLOT(active_cred->cr_label); 1571 obj = SLOT(kslabel); 1572 1573 if (!mls_dominate_effective(obj, subj)) 1574 return (EACCES); 1575 1576 return (0); 1577 } 1578 1579 static void 1580 mls_posixsem_create(struct ucred *cred, struct ksem *ks, 1581 struct label *kslabel) 1582 { 1583 struct mac_mls *source, *dest; 1584 1585 source = SLOT(cred->cr_label); 1586 dest = SLOT(kslabel); 1587 1588 mls_copy_effective(source, dest); 1589 } 1590 1591 static int 1592 mls_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, 1593 struct label *shmlabel, int prot, int flags) 1594 { 1595 struct mac_mls *subj, *obj; 1596 1597 if (!mls_enabled) 1598 return (0); 1599 1600 subj = SLOT(cred->cr_label); 1601 obj = SLOT(shmlabel); 1602 1603 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 1604 if (!mls_dominate_effective(subj, obj)) 1605 return (EACCES); 1606 } 1607 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 1608 if (!mls_dominate_effective(obj, subj)) 1609 return (EACCES); 1610 } 1611 1612 return (0); 1613 } 1614 1615 static int 1616 mls_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd, 1617 struct label *shmlabel, accmode_t accmode) 1618 { 1619 struct mac_mls *subj, *obj; 1620 1621 if (!mls_enabled) 1622 return (0); 1623 1624 subj = SLOT(cred->cr_label); 1625 obj = SLOT(shmlabel); 1626 1627 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) { 1628 if (!mls_dominate_effective(subj, obj)) 1629 return (EACCES); 1630 } 1631 if (accmode & VMODIFY_PERMS) { 1632 if (!mls_dominate_effective(obj, subj)) 1633 return (EACCES); 1634 } 1635 1636 return (0); 1637 } 1638 1639 static int 1640 mls_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred, 1641 struct shmfd *shm, struct label *shmlabel) 1642 { 1643 struct mac_mls *subj, *obj; 1644 1645 if (!mls_enabled || !revocation_enabled) 1646 return (0); 1647 1648 subj = SLOT(active_cred->cr_label); 1649 obj = SLOT(shmlabel); 1650 1651 if (!mls_dominate_effective(subj, obj)) 1652 return (EACCES); 1653 1654 return (0); 1655 } 1656 1657 static int 1658 mls_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, 1659 struct label *shmlabel, mode_t mode) 1660 { 1661 struct mac_mls *subj, *obj; 1662 1663 if (!mls_enabled) 1664 return (0); 1665 1666 subj = SLOT(cred->cr_label); 1667 obj = SLOT(shmlabel); 1668 1669 if (!mls_dominate_effective(obj, subj)) 1670 return (EACCES); 1671 1672 return (0); 1673 } 1674 1675 static int 1676 mls_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, 1677 struct label *shmlabel, uid_t uid, gid_t gid) 1678 { 1679 struct mac_mls *subj, *obj; 1680 1681 if (!mls_enabled) 1682 return (0); 1683 1684 subj = SLOT(cred->cr_label); 1685 obj = SLOT(shmlabel); 1686 1687 if (!mls_dominate_effective(obj, subj)) 1688 return (EACCES); 1689 1690 return (0); 1691 } 1692 1693 static int 1694 mls_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred, 1695 struct shmfd *shmfd, struct label *shmlabel) 1696 { 1697 struct mac_mls *subj, *obj; 1698 1699 if (!mls_enabled) 1700 return (0); 1701 1702 subj = SLOT(active_cred->cr_label); 1703 obj = SLOT(shmlabel); 1704 1705 if (!mls_dominate_effective(subj, obj)) 1706 return (EACCES); 1707 1708 return (0); 1709 } 1710 1711 static int 1712 mls_posixshm_check_truncate(struct ucred *active_cred, 1713 struct ucred *file_cred, struct shmfd *shmfd, struct label *shmlabel) 1714 { 1715 struct mac_mls *subj, *obj; 1716 1717 if (!mls_enabled) 1718 return (0); 1719 1720 subj = SLOT(active_cred->cr_label); 1721 obj = SLOT(shmlabel); 1722 1723 if (!mls_dominate_effective(obj, subj)) 1724 return (EACCES); 1725 1726 return (0); 1727 } 1728 1729 static int 1730 mls_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd, 1731 struct label *shmlabel) 1732 { 1733 struct mac_mls *subj, *obj; 1734 1735 if (!mls_enabled) 1736 return (0); 1737 1738 subj = SLOT(cred->cr_label); 1739 obj = SLOT(shmlabel); 1740 1741 if (!mls_dominate_effective(obj, subj)) 1742 return (EACCES); 1743 1744 return (0); 1745 } 1746 1747 static int 1748 mls_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred, 1749 struct shmfd *shm, struct label *shmlabel) 1750 { 1751 struct mac_mls *subj, *obj; 1752 1753 if (!mls_enabled || !revocation_enabled) 1754 return (0); 1755 1756 subj = SLOT(active_cred->cr_label); 1757 obj = SLOT(shmlabel); 1758 1759 if (!mls_dominate_effective(subj, obj)) 1760 return (EACCES); 1761 1762 return (0); 1763 } 1764 1765 static void 1766 mls_posixshm_create(struct ucred *cred, struct shmfd *shmfd, 1767 struct label *shmlabel) 1768 { 1769 struct mac_mls *source, *dest; 1770 1771 source = SLOT(cred->cr_label); 1772 dest = SLOT(shmlabel); 1773 1774 mls_copy_effective(source, dest); 1775 } 1776 1777 static int 1778 mls_proc_check_debug(struct ucred *cred, struct proc *p) 1779 { 1780 struct mac_mls *subj, *obj; 1781 1782 if (!mls_enabled) 1783 return (0); 1784 1785 subj = SLOT(cred->cr_label); 1786 obj = SLOT(p->p_ucred->cr_label); 1787 1788 /* XXX: range checks */ 1789 if (!mls_dominate_effective(subj, obj)) 1790 return (ESRCH); 1791 if (!mls_dominate_effective(obj, subj)) 1792 return (EACCES); 1793 1794 return (0); 1795 } 1796 1797 static int 1798 mls_proc_check_sched(struct ucred *cred, struct proc *p) 1799 { 1800 struct mac_mls *subj, *obj; 1801 1802 if (!mls_enabled) 1803 return (0); 1804 1805 subj = SLOT(cred->cr_label); 1806 obj = SLOT(p->p_ucred->cr_label); 1807 1808 /* XXX: range checks */ 1809 if (!mls_dominate_effective(subj, obj)) 1810 return (ESRCH); 1811 if (!mls_dominate_effective(obj, subj)) 1812 return (EACCES); 1813 1814 return (0); 1815 } 1816 1817 static int 1818 mls_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1819 { 1820 struct mac_mls *subj, *obj; 1821 1822 if (!mls_enabled) 1823 return (0); 1824 1825 subj = SLOT(cred->cr_label); 1826 obj = SLOT(p->p_ucred->cr_label); 1827 1828 /* XXX: range checks */ 1829 if (!mls_dominate_effective(subj, obj)) 1830 return (ESRCH); 1831 if (!mls_dominate_effective(obj, subj)) 1832 return (EACCES); 1833 1834 return (0); 1835 } 1836 1837 static int 1838 mls_socket_check_deliver(struct socket *so, struct label *solabel, 1839 struct mbuf *m, struct label *mlabel) 1840 { 1841 struct mac_mls *p, *s; 1842 int error; 1843 1844 if (!mls_enabled) 1845 return (0); 1846 1847 p = SLOT(mlabel); 1848 s = SLOT(solabel); 1849 1850 SOCK_LOCK(so); 1851 error = mls_equal_effective(p, s) ? 0 : EACCES; 1852 SOCK_UNLOCK(so); 1853 1854 return (error); 1855 } 1856 1857 static int 1858 mls_socket_check_relabel(struct ucred *cred, struct socket *so, 1859 struct label *solabel, struct label *newlabel) 1860 { 1861 struct mac_mls *subj, *obj, *new; 1862 int error; 1863 1864 SOCK_LOCK_ASSERT(so); 1865 1866 new = SLOT(newlabel); 1867 subj = SLOT(cred->cr_label); 1868 obj = SLOT(solabel); 1869 1870 /* 1871 * If there is an MLS label update for the socket, it may be an 1872 * update of effective. 1873 */ 1874 error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE); 1875 if (error) 1876 return (error); 1877 1878 /* 1879 * To relabel a socket, the old socket effective must be in the 1880 * subject range. 1881 */ 1882 if (!mls_effective_in_range(obj, subj)) 1883 return (EPERM); 1884 1885 /* 1886 * If the MLS label is to be changed, authorize as appropriate. 1887 */ 1888 if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) { 1889 /* 1890 * To relabel a socket, the new socket effective must be in 1891 * the subject range. 1892 */ 1893 if (!mls_effective_in_range(new, subj)) 1894 return (EPERM); 1895 1896 /* 1897 * To change the MLS label on the socket to contain EQUAL, 1898 * the subject must have appropriate privilege. 1899 */ 1900 if (mls_contains_equal(new)) { 1901 error = mls_subject_privileged(subj); 1902 if (error) 1903 return (error); 1904 } 1905 } 1906 1907 return (0); 1908 } 1909 1910 static int 1911 mls_socket_check_visible(struct ucred *cred, struct socket *so, 1912 struct label *solabel) 1913 { 1914 struct mac_mls *subj, *obj; 1915 1916 if (!mls_enabled) 1917 return (0); 1918 1919 subj = SLOT(cred->cr_label); 1920 obj = SLOT(solabel); 1921 1922 SOCK_LOCK(so); 1923 if (!mls_dominate_effective(subj, obj)) { 1924 SOCK_UNLOCK(so); 1925 return (ENOENT); 1926 } 1927 SOCK_UNLOCK(so); 1928 1929 return (0); 1930 } 1931 1932 static void 1933 mls_socket_create(struct ucred *cred, struct socket *so, 1934 struct label *solabel) 1935 { 1936 struct mac_mls *source, *dest; 1937 1938 source = SLOT(cred->cr_label); 1939 dest = SLOT(solabel); 1940 1941 mls_copy_effective(source, dest); 1942 } 1943 1944 static void 1945 mls_socket_create_mbuf(struct socket *so, struct label *solabel, 1946 struct mbuf *m, struct label *mlabel) 1947 { 1948 struct mac_mls *source, *dest; 1949 1950 source = SLOT(solabel); 1951 dest = SLOT(mlabel); 1952 1953 SOCK_LOCK(so); 1954 mls_copy_effective(source, dest); 1955 SOCK_UNLOCK(so); 1956 } 1957 1958 static void 1959 mls_socket_newconn(struct socket *oldso, struct label *oldsolabel, 1960 struct socket *newso, struct label *newsolabel) 1961 { 1962 struct mac_mls source, *dest; 1963 1964 SOCK_LOCK(oldso); 1965 source = *SLOT(oldsolabel); 1966 SOCK_UNLOCK(oldso); 1967 1968 dest = SLOT(newsolabel); 1969 1970 SOCK_LOCK(newso); 1971 mls_copy_effective(&source, dest); 1972 SOCK_UNLOCK(newso); 1973 } 1974 1975 static void 1976 mls_socket_relabel(struct ucred *cred, struct socket *so, 1977 struct label *solabel, struct label *newlabel) 1978 { 1979 struct mac_mls *source, *dest; 1980 1981 SOCK_LOCK_ASSERT(so); 1982 1983 source = SLOT(newlabel); 1984 dest = SLOT(solabel); 1985 1986 mls_copy(source, dest); 1987 } 1988 1989 static void 1990 mls_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 1991 struct socket *so, struct label *sopeerlabel) 1992 { 1993 struct mac_mls *source, *dest; 1994 1995 source = SLOT(mlabel); 1996 dest = SLOT(sopeerlabel); 1997 1998 SOCK_LOCK(so); 1999 mls_copy_effective(source, dest); 2000 SOCK_UNLOCK(so); 2001 } 2002 2003 static void 2004 mls_socketpeer_set_from_socket(struct socket *oldso, 2005 struct label *oldsolabel, struct socket *newso, 2006 struct label *newsopeerlabel) 2007 { 2008 struct mac_mls source, *dest; 2009 2010 SOCK_LOCK(oldso); 2011 source = *SLOT(oldsolabel); 2012 SOCK_UNLOCK(oldso); 2013 2014 dest = SLOT(newsopeerlabel); 2015 2016 SOCK_LOCK(newso); 2017 mls_copy_effective(&source, dest); 2018 SOCK_UNLOCK(newso); 2019 } 2020 2021 static void 2022 mls_syncache_create(struct label *label, struct inpcb *inp) 2023 { 2024 struct mac_mls *source, *dest; 2025 2026 source = SLOT(inp->inp_label); 2027 dest = SLOT(label); 2028 2029 mls_copy_effective(source, dest); 2030 } 2031 2032 static void 2033 mls_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2034 struct label *mlabel) 2035 { 2036 struct mac_mls *source, *dest; 2037 2038 source = SLOT(sc_label); 2039 dest = SLOT(mlabel); 2040 2041 mls_copy_effective(source, dest); 2042 } 2043 2044 static int 2045 mls_system_check_acct(struct ucred *cred, struct vnode *vp, 2046 struct label *vplabel) 2047 { 2048 struct mac_mls *subj, *obj; 2049 2050 if (!mls_enabled) 2051 return (0); 2052 2053 if (vplabel == NULL) 2054 return (0); 2055 2056 subj = SLOT(cred->cr_label); 2057 obj = SLOT(vplabel); 2058 2059 if (!mls_dominate_effective(obj, subj) || 2060 !mls_dominate_effective(subj, obj)) 2061 return (EACCES); 2062 2063 return (0); 2064 } 2065 2066 static int 2067 mls_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2068 struct label *vplabel) 2069 { 2070 struct mac_mls *subj, *obj; 2071 2072 if (!mls_enabled) 2073 return (0); 2074 2075 subj = SLOT(cred->cr_label); 2076 obj = SLOT(vplabel); 2077 2078 if (!mls_dominate_effective(obj, subj) || 2079 !mls_dominate_effective(subj, obj)) 2080 return (EACCES); 2081 2082 return (0); 2083 } 2084 2085 static int 2086 mls_system_check_swapon(struct ucred *cred, struct vnode *vp, 2087 struct label *vplabel) 2088 { 2089 struct mac_mls *subj, *obj; 2090 2091 if (!mls_enabled) 2092 return (0); 2093 2094 subj = SLOT(cred->cr_label); 2095 obj = SLOT(vplabel); 2096 2097 if (!mls_dominate_effective(obj, subj) || 2098 !mls_dominate_effective(subj, obj)) 2099 return (EACCES); 2100 2101 return (0); 2102 } 2103 2104 static void 2105 mls_sysvmsg_cleanup(struct label *msglabel) 2106 { 2107 2108 bzero(SLOT(msglabel), sizeof(struct mac_mls)); 2109 } 2110 2111 static void 2112 mls_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2113 struct label *msqlabel, struct msg *msgptr, struct label *msglabel) 2114 { 2115 struct mac_mls *source, *dest; 2116 2117 /* Ignore the msgq label. */ 2118 source = SLOT(cred->cr_label); 2119 dest = SLOT(msglabel); 2120 2121 mls_copy_effective(source, dest); 2122 } 2123 2124 static int 2125 mls_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 2126 struct label *msglabel) 2127 { 2128 struct mac_mls *subj, *obj; 2129 2130 if (!mls_enabled) 2131 return (0); 2132 2133 subj = SLOT(cred->cr_label); 2134 obj = SLOT(msglabel); 2135 2136 if (!mls_dominate_effective(subj, obj)) 2137 return (EACCES); 2138 2139 return (0); 2140 } 2141 2142 static int 2143 mls_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 2144 struct label *msglabel) 2145 { 2146 struct mac_mls *subj, *obj; 2147 2148 if (!mls_enabled) 2149 return (0); 2150 2151 subj = SLOT(cred->cr_label); 2152 obj = SLOT(msglabel); 2153 2154 if (!mls_dominate_effective(obj, subj)) 2155 return (EACCES); 2156 2157 return (0); 2158 } 2159 2160 static int 2161 mls_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 2162 struct label *msqklabel) 2163 { 2164 struct mac_mls *subj, *obj; 2165 2166 if (!mls_enabled) 2167 return (0); 2168 2169 subj = SLOT(cred->cr_label); 2170 obj = SLOT(msqklabel); 2171 2172 if (!mls_dominate_effective(subj, obj)) 2173 return (EACCES); 2174 2175 return (0); 2176 } 2177 2178 static int 2179 mls_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 2180 struct label *msqklabel) 2181 { 2182 struct mac_mls *subj, *obj; 2183 2184 if (!mls_enabled) 2185 return (0); 2186 2187 subj = SLOT(cred->cr_label); 2188 obj = SLOT(msqklabel); 2189 2190 if (!mls_dominate_effective(obj, subj)) 2191 return (EACCES); 2192 2193 return (0); 2194 } 2195 2196 static int 2197 mls_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 2198 struct label *msqklabel) 2199 { 2200 struct mac_mls *subj, *obj; 2201 2202 if (!mls_enabled) 2203 return (0); 2204 2205 subj = SLOT(cred->cr_label); 2206 obj = SLOT(msqklabel); 2207 2208 if (!mls_dominate_effective(subj, obj)) 2209 return (EACCES); 2210 2211 return (0); 2212 } 2213 2214 static int 2215 mls_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 2216 struct label *msqklabel, int cmd) 2217 { 2218 struct mac_mls *subj, *obj; 2219 2220 if (!mls_enabled) 2221 return (0); 2222 2223 subj = SLOT(cred->cr_label); 2224 obj = SLOT(msqklabel); 2225 2226 switch(cmd) { 2227 case IPC_RMID: 2228 case IPC_SET: 2229 if (!mls_dominate_effective(obj, subj)) 2230 return (EACCES); 2231 break; 2232 2233 case IPC_STAT: 2234 if (!mls_dominate_effective(subj, obj)) 2235 return (EACCES); 2236 break; 2237 2238 default: 2239 return (EACCES); 2240 } 2241 2242 return (0); 2243 } 2244 2245 static void 2246 mls_sysvmsq_cleanup(struct label *msqlabel) 2247 { 2248 2249 bzero(SLOT(msqlabel), sizeof(struct mac_mls)); 2250 } 2251 2252 static void 2253 mls_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2254 struct label *msqlabel) 2255 { 2256 struct mac_mls *source, *dest; 2257 2258 source = SLOT(cred->cr_label); 2259 dest = SLOT(msqlabel); 2260 2261 mls_copy_effective(source, dest); 2262 } 2263 2264 static int 2265 mls_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 2266 struct label *semaklabel, int cmd) 2267 { 2268 struct mac_mls *subj, *obj; 2269 2270 if (!mls_enabled) 2271 return (0); 2272 2273 subj = SLOT(cred->cr_label); 2274 obj = SLOT(semaklabel); 2275 2276 switch(cmd) { 2277 case IPC_RMID: 2278 case IPC_SET: 2279 case SETVAL: 2280 case SETALL: 2281 if (!mls_dominate_effective(obj, subj)) 2282 return (EACCES); 2283 break; 2284 2285 case IPC_STAT: 2286 case GETVAL: 2287 case GETPID: 2288 case GETNCNT: 2289 case GETZCNT: 2290 case GETALL: 2291 if (!mls_dominate_effective(subj, obj)) 2292 return (EACCES); 2293 break; 2294 2295 default: 2296 return (EACCES); 2297 } 2298 2299 return (0); 2300 } 2301 2302 static int 2303 mls_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 2304 struct label *semaklabel) 2305 { 2306 struct mac_mls *subj, *obj; 2307 2308 if (!mls_enabled) 2309 return (0); 2310 2311 subj = SLOT(cred->cr_label); 2312 obj = SLOT(semaklabel); 2313 2314 if (!mls_dominate_effective(subj, obj)) 2315 return (EACCES); 2316 2317 return (0); 2318 } 2319 2320 static int 2321 mls_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 2322 struct label *semaklabel, size_t accesstype) 2323 { 2324 struct mac_mls *subj, *obj; 2325 2326 if (!mls_enabled) 2327 return (0); 2328 2329 subj = SLOT(cred->cr_label); 2330 obj = SLOT(semaklabel); 2331 2332 if( accesstype & SEM_R ) 2333 if (!mls_dominate_effective(subj, obj)) 2334 return (EACCES); 2335 2336 if( accesstype & SEM_A ) 2337 if (!mls_dominate_effective(obj, subj)) 2338 return (EACCES); 2339 2340 return (0); 2341 } 2342 2343 static void 2344 mls_sysvsem_cleanup(struct label *semalabel) 2345 { 2346 2347 bzero(SLOT(semalabel), sizeof(struct mac_mls)); 2348 } 2349 2350 static void 2351 mls_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr, 2352 struct label *semalabel) 2353 { 2354 struct mac_mls *source, *dest; 2355 2356 source = SLOT(cred->cr_label); 2357 dest = SLOT(semalabel); 2358 2359 mls_copy_effective(source, dest); 2360 } 2361 2362 static int 2363 mls_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 2364 struct label *shmseglabel, int shmflg) 2365 { 2366 struct mac_mls *subj, *obj; 2367 2368 if (!mls_enabled) 2369 return (0); 2370 2371 subj = SLOT(cred->cr_label); 2372 obj = SLOT(shmseglabel); 2373 2374 if (!mls_dominate_effective(subj, obj)) 2375 return (EACCES); 2376 if ((shmflg & SHM_RDONLY) == 0) { 2377 if (!mls_dominate_effective(obj, subj)) 2378 return (EACCES); 2379 } 2380 2381 return (0); 2382 } 2383 2384 static int 2385 mls_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 2386 struct label *shmseglabel, int cmd) 2387 { 2388 struct mac_mls *subj, *obj; 2389 2390 if (!mls_enabled) 2391 return (0); 2392 2393 subj = SLOT(cred->cr_label); 2394 obj = SLOT(shmseglabel); 2395 2396 switch(cmd) { 2397 case IPC_RMID: 2398 case IPC_SET: 2399 if (!mls_dominate_effective(obj, subj)) 2400 return (EACCES); 2401 break; 2402 2403 case IPC_STAT: 2404 case SHM_STAT: 2405 if (!mls_dominate_effective(subj, obj)) 2406 return (EACCES); 2407 break; 2408 2409 default: 2410 return (EACCES); 2411 } 2412 2413 return (0); 2414 } 2415 2416 static int 2417 mls_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 2418 struct label *shmseglabel, int shmflg) 2419 { 2420 struct mac_mls *subj, *obj; 2421 2422 if (!mls_enabled) 2423 return (0); 2424 2425 subj = SLOT(cred->cr_label); 2426 obj = SLOT(shmseglabel); 2427 2428 if (!mls_dominate_effective(obj, subj)) 2429 return (EACCES); 2430 2431 return (0); 2432 } 2433 2434 static void 2435 mls_sysvshm_cleanup(struct label *shmlabel) 2436 { 2437 2438 bzero(SLOT(shmlabel), sizeof(struct mac_mls)); 2439 } 2440 2441 static void 2442 mls_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr, 2443 struct label *shmlabel) 2444 { 2445 struct mac_mls *source, *dest; 2446 2447 source = SLOT(cred->cr_label); 2448 dest = SLOT(shmlabel); 2449 2450 mls_copy_effective(source, dest); 2451 } 2452 2453 static int 2454 mls_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2455 struct vnode *vp, struct label *vplabel) 2456 { 2457 struct mac_mls mm_temp, *source, *dest; 2458 int buflen, error; 2459 2460 source = SLOT(mplabel); 2461 dest = SLOT(vplabel); 2462 2463 buflen = sizeof(mm_temp); 2464 bzero(&mm_temp, buflen); 2465 2466 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE, 2467 MAC_MLS_EXTATTR_NAME, &buflen, (char *) &mm_temp, curthread); 2468 if (error == ENOATTR || error == EOPNOTSUPP) { 2469 /* Fall back to the mntlabel. */ 2470 mls_copy_effective(source, dest); 2471 return (0); 2472 } else if (error) 2473 return (error); 2474 2475 if (buflen != sizeof(mm_temp)) { 2476 printf("mls_vnode_associate_extattr: bad size %d\n", buflen); 2477 return (EPERM); 2478 } 2479 if (mls_valid(&mm_temp) != 0) { 2480 printf("mls_vnode_associate_extattr: invalid\n"); 2481 return (EPERM); 2482 } 2483 if ((mm_temp.mm_flags & MAC_MLS_FLAGS_BOTH) != 2484 MAC_MLS_FLAG_EFFECTIVE) { 2485 printf("mls_associated_vnode_extattr: not effective\n"); 2486 return (EPERM); 2487 } 2488 2489 mls_copy_effective(&mm_temp, dest); 2490 return (0); 2491 } 2492 2493 static void 2494 mls_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2495 struct vnode *vp, struct label *vplabel) 2496 { 2497 struct mac_mls *source, *dest; 2498 2499 source = SLOT(mplabel); 2500 dest = SLOT(vplabel); 2501 2502 mls_copy_effective(source, dest); 2503 } 2504 2505 static int 2506 mls_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2507 struct label *dvplabel) 2508 { 2509 struct mac_mls *subj, *obj; 2510 2511 if (!mls_enabled) 2512 return (0); 2513 2514 subj = SLOT(cred->cr_label); 2515 obj = SLOT(dvplabel); 2516 2517 if (!mls_dominate_effective(subj, obj)) 2518 return (EACCES); 2519 2520 return (0); 2521 } 2522 2523 static int 2524 mls_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2525 struct label *dvplabel) 2526 { 2527 struct mac_mls *subj, *obj; 2528 2529 if (!mls_enabled) 2530 return (0); 2531 2532 subj = SLOT(cred->cr_label); 2533 obj = SLOT(dvplabel); 2534 2535 if (!mls_dominate_effective(subj, obj)) 2536 return (EACCES); 2537 2538 return (0); 2539 } 2540 2541 static int 2542 mls_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2543 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2544 { 2545 struct mac_mls *subj, *obj; 2546 2547 if (!mls_enabled) 2548 return (0); 2549 2550 subj = SLOT(cred->cr_label); 2551 obj = SLOT(dvplabel); 2552 2553 if (!mls_dominate_effective(obj, subj)) 2554 return (EACCES); 2555 2556 return (0); 2557 } 2558 2559 static int 2560 mls_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2561 struct label *vplabel, acl_type_t type) 2562 { 2563 struct mac_mls *subj, *obj; 2564 2565 if (!mls_enabled) 2566 return (0); 2567 2568 subj = SLOT(cred->cr_label); 2569 obj = SLOT(vplabel); 2570 2571 if (!mls_dominate_effective(obj, subj)) 2572 return (EACCES); 2573 2574 return (0); 2575 } 2576 2577 static int 2578 mls_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2579 struct label *vplabel, int attrnamespace, const char *name) 2580 { 2581 struct mac_mls *subj, *obj; 2582 2583 if (!mls_enabled) 2584 return (0); 2585 2586 subj = SLOT(cred->cr_label); 2587 obj = SLOT(vplabel); 2588 2589 if (!mls_dominate_effective(obj, subj)) 2590 return (EACCES); 2591 2592 return (0); 2593 } 2594 2595 static int 2596 mls_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2597 struct label *vplabel, struct image_params *imgp, 2598 struct label *execlabel) 2599 { 2600 struct mac_mls *subj, *obj, *exec; 2601 int error; 2602 2603 if (execlabel != NULL) { 2604 /* 2605 * We currently don't permit labels to be changed at 2606 * exec-time as part of MLS, so disallow non-NULL MLS label 2607 * elements in the execlabel. 2608 */ 2609 exec = SLOT(execlabel); 2610 error = mls_atmostflags(exec, 0); 2611 if (error) 2612 return (error); 2613 } 2614 2615 if (!mls_enabled) 2616 return (0); 2617 2618 subj = SLOT(cred->cr_label); 2619 obj = SLOT(vplabel); 2620 2621 if (!mls_dominate_effective(subj, obj)) 2622 return (EACCES); 2623 2624 return (0); 2625 } 2626 2627 static int 2628 mls_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2629 struct label *vplabel, acl_type_t type) 2630 { 2631 struct mac_mls *subj, *obj; 2632 2633 if (!mls_enabled) 2634 return (0); 2635 2636 subj = SLOT(cred->cr_label); 2637 obj = SLOT(vplabel); 2638 2639 if (!mls_dominate_effective(subj, obj)) 2640 return (EACCES); 2641 2642 return (0); 2643 } 2644 2645 static int 2646 mls_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2647 struct label *vplabel, int attrnamespace, const char *name) 2648 { 2649 struct mac_mls *subj, *obj; 2650 2651 if (!mls_enabled) 2652 return (0); 2653 2654 subj = SLOT(cred->cr_label); 2655 obj = SLOT(vplabel); 2656 2657 if (!mls_dominate_effective(subj, obj)) 2658 return (EACCES); 2659 2660 return (0); 2661 } 2662 2663 static int 2664 mls_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2665 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2666 struct componentname *cnp) 2667 { 2668 struct mac_mls *subj, *obj; 2669 2670 if (!mls_enabled) 2671 return (0); 2672 2673 subj = SLOT(cred->cr_label); 2674 obj = SLOT(dvplabel); 2675 2676 if (!mls_dominate_effective(obj, subj)) 2677 return (EACCES); 2678 2679 obj = SLOT(vplabel); 2680 if (!mls_dominate_effective(obj, subj)) 2681 return (EACCES); 2682 2683 return (0); 2684 } 2685 2686 static int 2687 mls_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2688 struct label *vplabel, int attrnamespace) 2689 { 2690 2691 struct mac_mls *subj, *obj; 2692 2693 if (!mls_enabled) 2694 return (0); 2695 2696 subj = SLOT(cred->cr_label); 2697 obj = SLOT(vplabel); 2698 2699 if (!mls_dominate_effective(subj, obj)) 2700 return (EACCES); 2701 2702 return (0); 2703 } 2704 2705 static int 2706 mls_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2707 struct label *dvplabel, struct componentname *cnp) 2708 { 2709 struct mac_mls *subj, *obj; 2710 2711 if (!mls_enabled) 2712 return (0); 2713 2714 subj = SLOT(cred->cr_label); 2715 obj = SLOT(dvplabel); 2716 2717 if (!mls_dominate_effective(subj, obj)) 2718 return (EACCES); 2719 2720 return (0); 2721 } 2722 2723 static int 2724 mls_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2725 struct label *vplabel, int prot, int flags) 2726 { 2727 struct mac_mls *subj, *obj; 2728 2729 /* 2730 * Rely on the use of open()-time protections to handle 2731 * non-revocation cases. 2732 */ 2733 if (!mls_enabled || !revocation_enabled) 2734 return (0); 2735 2736 subj = SLOT(cred->cr_label); 2737 obj = SLOT(vplabel); 2738 2739 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2740 if (!mls_dominate_effective(subj, obj)) 2741 return (EACCES); 2742 } 2743 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2744 if (!mls_dominate_effective(obj, subj)) 2745 return (EACCES); 2746 } 2747 2748 return (0); 2749 } 2750 2751 static int 2752 mls_vnode_check_open(struct ucred *cred, struct vnode *vp, 2753 struct label *vplabel, accmode_t accmode) 2754 { 2755 struct mac_mls *subj, *obj; 2756 2757 if (!mls_enabled) 2758 return (0); 2759 2760 subj = SLOT(cred->cr_label); 2761 obj = SLOT(vplabel); 2762 2763 /* XXX privilege override for admin? */ 2764 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) { 2765 if (!mls_dominate_effective(subj, obj)) 2766 return (EACCES); 2767 } 2768 if (accmode & VMODIFY_PERMS) { 2769 if (!mls_dominate_effective(obj, subj)) 2770 return (EACCES); 2771 } 2772 2773 return (0); 2774 } 2775 2776 static int 2777 mls_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2778 struct vnode *vp, struct label *vplabel) 2779 { 2780 struct mac_mls *subj, *obj; 2781 2782 if (!mls_enabled || !revocation_enabled) 2783 return (0); 2784 2785 subj = SLOT(active_cred->cr_label); 2786 obj = SLOT(vplabel); 2787 2788 if (!mls_dominate_effective(subj, obj)) 2789 return (EACCES); 2790 2791 return (0); 2792 } 2793 2794 static int 2795 mls_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2796 struct vnode *vp, struct label *vplabel) 2797 { 2798 struct mac_mls *subj, *obj; 2799 2800 if (!mls_enabled || !revocation_enabled) 2801 return (0); 2802 2803 subj = SLOT(active_cred->cr_label); 2804 obj = SLOT(vplabel); 2805 2806 if (!mls_dominate_effective(subj, obj)) 2807 return (EACCES); 2808 2809 return (0); 2810 } 2811 2812 static int 2813 mls_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2814 struct label *dvplabel) 2815 { 2816 struct mac_mls *subj, *obj; 2817 2818 if (!mls_enabled) 2819 return (0); 2820 2821 subj = SLOT(cred->cr_label); 2822 obj = SLOT(dvplabel); 2823 2824 if (!mls_dominate_effective(subj, obj)) 2825 return (EACCES); 2826 2827 return (0); 2828 } 2829 2830 static int 2831 mls_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2832 struct label *vplabel) 2833 { 2834 struct mac_mls *subj, *obj; 2835 2836 if (!mls_enabled) 2837 return (0); 2838 2839 subj = SLOT(cred->cr_label); 2840 obj = SLOT(vplabel); 2841 2842 if (!mls_dominate_effective(subj, obj)) 2843 return (EACCES); 2844 2845 return (0); 2846 } 2847 2848 static int 2849 mls_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2850 struct label *vplabel, struct label *newlabel) 2851 { 2852 struct mac_mls *old, *new, *subj; 2853 int error; 2854 2855 old = SLOT(vplabel); 2856 new = SLOT(newlabel); 2857 subj = SLOT(cred->cr_label); 2858 2859 /* 2860 * If there is an MLS label update for the vnode, it must be a 2861 * effective label. 2862 */ 2863 error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE); 2864 if (error) 2865 return (error); 2866 2867 /* 2868 * To perform a relabel of the vnode (MLS label or not), MLS must 2869 * authorize the relabel. 2870 */ 2871 if (!mls_effective_in_range(old, subj)) 2872 return (EPERM); 2873 2874 /* 2875 * If the MLS label is to be changed, authorize as appropriate. 2876 */ 2877 if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) { 2878 /* 2879 * To change the MLS label on a vnode, the new vnode label 2880 * must be in the subject range. 2881 */ 2882 if (!mls_effective_in_range(new, subj)) 2883 return (EPERM); 2884 2885 /* 2886 * To change the MLS label on the vnode to be EQUAL, the 2887 * subject must have appropriate privilege. 2888 */ 2889 if (mls_contains_equal(new)) { 2890 error = mls_subject_privileged(subj); 2891 if (error) 2892 return (error); 2893 } 2894 } 2895 2896 return (0); 2897 } 2898 2899 static int 2900 mls_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 2901 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2902 struct componentname *cnp) 2903 { 2904 struct mac_mls *subj, *obj; 2905 2906 if (!mls_enabled) 2907 return (0); 2908 2909 subj = SLOT(cred->cr_label); 2910 obj = SLOT(dvplabel); 2911 2912 if (!mls_dominate_effective(obj, subj)) 2913 return (EACCES); 2914 2915 obj = SLOT(vplabel); 2916 2917 if (!mls_dominate_effective(obj, subj)) 2918 return (EACCES); 2919 2920 return (0); 2921 } 2922 2923 static int 2924 mls_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 2925 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2926 int samedir, struct componentname *cnp) 2927 { 2928 struct mac_mls *subj, *obj; 2929 2930 if (!mls_enabled) 2931 return (0); 2932 2933 subj = SLOT(cred->cr_label); 2934 obj = SLOT(dvplabel); 2935 2936 if (!mls_dominate_effective(obj, subj)) 2937 return (EACCES); 2938 2939 if (vp != NULL) { 2940 obj = SLOT(vplabel); 2941 2942 if (!mls_dominate_effective(obj, subj)) 2943 return (EACCES); 2944 } 2945 2946 return (0); 2947 } 2948 2949 static int 2950 mls_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 2951 struct label *vplabel) 2952 { 2953 struct mac_mls *subj, *obj; 2954 2955 if (!mls_enabled) 2956 return (0); 2957 2958 subj = SLOT(cred->cr_label); 2959 obj = SLOT(vplabel); 2960 2961 if (!mls_dominate_effective(obj, subj)) 2962 return (EACCES); 2963 2964 return (0); 2965 } 2966 2967 static int 2968 mls_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 2969 struct label *vplabel, acl_type_t type, struct acl *acl) 2970 { 2971 struct mac_mls *subj, *obj; 2972 2973 if (!mls_enabled) 2974 return (0); 2975 2976 subj = SLOT(cred->cr_label); 2977 obj = SLOT(vplabel); 2978 2979 if (!mls_dominate_effective(obj, subj)) 2980 return (EACCES); 2981 2982 return (0); 2983 } 2984 2985 static int 2986 mls_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 2987 struct label *vplabel, int attrnamespace, const char *name) 2988 { 2989 struct mac_mls *subj, *obj; 2990 2991 if (!mls_enabled) 2992 return (0); 2993 2994 subj = SLOT(cred->cr_label); 2995 obj = SLOT(vplabel); 2996 2997 if (!mls_dominate_effective(obj, subj)) 2998 return (EACCES); 2999 3000 /* XXX: protect the MAC EA in a special way? */ 3001 3002 return (0); 3003 } 3004 3005 static int 3006 mls_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3007 struct label *vplabel, u_long flags) 3008 { 3009 struct mac_mls *subj, *obj; 3010 3011 if (!mls_enabled) 3012 return (0); 3013 3014 subj = SLOT(cred->cr_label); 3015 obj = SLOT(vplabel); 3016 3017 if (!mls_dominate_effective(obj, subj)) 3018 return (EACCES); 3019 3020 return (0); 3021 } 3022 3023 static int 3024 mls_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3025 struct label *vplabel, mode_t mode) 3026 { 3027 struct mac_mls *subj, *obj; 3028 3029 if (!mls_enabled) 3030 return (0); 3031 3032 subj = SLOT(cred->cr_label); 3033 obj = SLOT(vplabel); 3034 3035 if (!mls_dominate_effective(obj, subj)) 3036 return (EACCES); 3037 3038 return (0); 3039 } 3040 3041 static int 3042 mls_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3043 struct label *vplabel, uid_t uid, gid_t gid) 3044 { 3045 struct mac_mls *subj, *obj; 3046 3047 if (!mls_enabled) 3048 return (0); 3049 3050 subj = SLOT(cred->cr_label); 3051 obj = SLOT(vplabel); 3052 3053 if (!mls_dominate_effective(obj, subj)) 3054 return (EACCES); 3055 3056 return (0); 3057 } 3058 3059 static int 3060 mls_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3061 struct label *vplabel, struct timespec atime, struct timespec mtime) 3062 { 3063 struct mac_mls *subj, *obj; 3064 3065 if (!mls_enabled) 3066 return (0); 3067 3068 subj = SLOT(cred->cr_label); 3069 obj = SLOT(vplabel); 3070 3071 if (!mls_dominate_effective(obj, subj)) 3072 return (EACCES); 3073 3074 return (0); 3075 } 3076 3077 static int 3078 mls_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3079 struct vnode *vp, struct label *vplabel) 3080 { 3081 struct mac_mls *subj, *obj; 3082 3083 if (!mls_enabled) 3084 return (0); 3085 3086 subj = SLOT(active_cred->cr_label); 3087 obj = SLOT(vplabel); 3088 3089 if (!mls_dominate_effective(subj, obj)) 3090 return (EACCES); 3091 3092 return (0); 3093 } 3094 3095 static int 3096 mls_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3097 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3098 struct componentname *cnp) 3099 { 3100 struct mac_mls *subj, *obj; 3101 3102 if (!mls_enabled) 3103 return (0); 3104 3105 subj = SLOT(cred->cr_label); 3106 obj = SLOT(dvplabel); 3107 3108 if (!mls_dominate_effective(obj, subj)) 3109 return (EACCES); 3110 3111 obj = SLOT(vplabel); 3112 3113 if (!mls_dominate_effective(obj, subj)) 3114 return (EACCES); 3115 3116 return (0); 3117 } 3118 3119 static int 3120 mls_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred, 3121 struct vnode *vp, struct label *vplabel) 3122 { 3123 struct mac_mls *subj, *obj; 3124 3125 if (!mls_enabled || !revocation_enabled) 3126 return (0); 3127 3128 subj = SLOT(active_cred->cr_label); 3129 obj = SLOT(vplabel); 3130 3131 if (!mls_dominate_effective(obj, subj)) 3132 return (EACCES); 3133 3134 return (0); 3135 } 3136 3137 static int 3138 mls_vnode_create_extattr(struct ucred *cred, struct mount *mp, 3139 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 3140 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 3141 { 3142 struct mac_mls *source, *dest, mm_temp; 3143 size_t buflen; 3144 int error; 3145 3146 buflen = sizeof(mm_temp); 3147 bzero(&mm_temp, buflen); 3148 3149 source = SLOT(cred->cr_label); 3150 dest = SLOT(vplabel); 3151 mls_copy_effective(source, &mm_temp); 3152 3153 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE, 3154 MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread); 3155 if (error == 0) 3156 mls_copy_effective(source, dest); 3157 return (error); 3158 } 3159 3160 static void 3161 mls_vnode_relabel(struct ucred *cred, struct vnode *vp, 3162 struct label *vplabel, struct label *label) 3163 { 3164 struct mac_mls *source, *dest; 3165 3166 source = SLOT(label); 3167 dest = SLOT(vplabel); 3168 3169 mls_copy(source, dest); 3170 } 3171 3172 static int 3173 mls_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 3174 struct label *vplabel, struct label *intlabel) 3175 { 3176 struct mac_mls *source, mm_temp; 3177 size_t buflen; 3178 int error; 3179 3180 buflen = sizeof(mm_temp); 3181 bzero(&mm_temp, buflen); 3182 3183 source = SLOT(intlabel); 3184 if ((source->mm_flags & MAC_MLS_FLAG_EFFECTIVE) == 0) 3185 return (0); 3186 3187 mls_copy_effective(source, &mm_temp); 3188 3189 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE, 3190 MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread); 3191 return (error); 3192 } 3193 3194 static struct mac_policy_ops mls_ops = 3195 { 3196 .mpo_init = mls_init, 3197 3198 .mpo_bpfdesc_check_receive = mls_bpfdesc_check_receive, 3199 .mpo_bpfdesc_create = mls_bpfdesc_create, 3200 .mpo_bpfdesc_create_mbuf = mls_bpfdesc_create_mbuf, 3201 .mpo_bpfdesc_destroy_label = mls_destroy_label, 3202 .mpo_bpfdesc_init_label = mls_init_label, 3203 3204 .mpo_cred_associate_nfsd = mls_cred_associate_nfsd, 3205 .mpo_cred_check_relabel = mls_cred_check_relabel, 3206 .mpo_cred_check_visible = mls_cred_check_visible, 3207 .mpo_cred_copy_label = mls_copy_label, 3208 .mpo_cred_create_init = mls_cred_create_init, 3209 .mpo_cred_create_swapper = mls_cred_create_swapper, 3210 .mpo_cred_destroy_label = mls_destroy_label, 3211 .mpo_cred_externalize_label = mls_externalize_label, 3212 .mpo_cred_init_label = mls_init_label, 3213 .mpo_cred_internalize_label = mls_internalize_label, 3214 .mpo_cred_relabel = mls_cred_relabel, 3215 3216 .mpo_devfs_create_device = mls_devfs_create_device, 3217 .mpo_devfs_create_directory = mls_devfs_create_directory, 3218 .mpo_devfs_create_symlink = mls_devfs_create_symlink, 3219 .mpo_devfs_destroy_label = mls_destroy_label, 3220 .mpo_devfs_init_label = mls_init_label, 3221 .mpo_devfs_update = mls_devfs_update, 3222 .mpo_devfs_vnode_associate = mls_devfs_vnode_associate, 3223 3224 .mpo_ifnet_check_relabel = mls_ifnet_check_relabel, 3225 .mpo_ifnet_check_transmit = mls_ifnet_check_transmit, 3226 .mpo_ifnet_copy_label = mls_copy_label, 3227 .mpo_ifnet_create = mls_ifnet_create, 3228 .mpo_ifnet_create_mbuf = mls_ifnet_create_mbuf, 3229 .mpo_ifnet_destroy_label = mls_destroy_label, 3230 .mpo_ifnet_externalize_label = mls_externalize_label, 3231 .mpo_ifnet_init_label = mls_init_label, 3232 .mpo_ifnet_internalize_label = mls_internalize_label, 3233 .mpo_ifnet_relabel = mls_ifnet_relabel, 3234 3235 .mpo_inpcb_check_deliver = mls_inpcb_check_deliver, 3236 .mpo_inpcb_check_visible = mls_inpcb_check_visible, 3237 .mpo_inpcb_create = mls_inpcb_create, 3238 .mpo_inpcb_create_mbuf = mls_inpcb_create_mbuf, 3239 .mpo_inpcb_destroy_label = mls_destroy_label, 3240 .mpo_inpcb_init_label = mls_init_label_waitcheck, 3241 .mpo_inpcb_sosetlabel = mls_inpcb_sosetlabel, 3242 3243 .mpo_ip6q_create = mls_ip6q_create, 3244 .mpo_ip6q_destroy_label = mls_destroy_label, 3245 .mpo_ip6q_init_label = mls_init_label_waitcheck, 3246 .mpo_ip6q_match = mls_ip6q_match, 3247 .mpo_ip6q_reassemble = mls_ip6q_reassemble, 3248 .mpo_ip6q_update = mls_ip6q_update, 3249 3250 .mpo_ipq_create = mls_ipq_create, 3251 .mpo_ipq_destroy_label = mls_destroy_label, 3252 .mpo_ipq_init_label = mls_init_label_waitcheck, 3253 .mpo_ipq_match = mls_ipq_match, 3254 .mpo_ipq_reassemble = mls_ipq_reassemble, 3255 .mpo_ipq_update = mls_ipq_update, 3256 3257 .mpo_mbuf_copy_label = mls_copy_label, 3258 .mpo_mbuf_destroy_label = mls_destroy_label, 3259 .mpo_mbuf_init_label = mls_init_label_waitcheck, 3260 3261 .mpo_mount_check_stat = mls_mount_check_stat, 3262 .mpo_mount_create = mls_mount_create, 3263 .mpo_mount_destroy_label = mls_destroy_label, 3264 .mpo_mount_init_label = mls_init_label, 3265 3266 .mpo_netinet_arp_send = mls_netinet_arp_send, 3267 .mpo_netinet_firewall_reply = mls_netinet_firewall_reply, 3268 .mpo_netinet_firewall_send = mls_netinet_firewall_send, 3269 .mpo_netinet_fragment = mls_netinet_fragment, 3270 .mpo_netinet_icmp_reply = mls_netinet_icmp_reply, 3271 .mpo_netinet_igmp_send = mls_netinet_igmp_send, 3272 3273 .mpo_netinet6_nd6_send = mls_netinet6_nd6_send, 3274 3275 .mpo_pipe_check_ioctl = mls_pipe_check_ioctl, 3276 .mpo_pipe_check_poll = mls_pipe_check_poll, 3277 .mpo_pipe_check_read = mls_pipe_check_read, 3278 .mpo_pipe_check_relabel = mls_pipe_check_relabel, 3279 .mpo_pipe_check_stat = mls_pipe_check_stat, 3280 .mpo_pipe_check_write = mls_pipe_check_write, 3281 .mpo_pipe_copy_label = mls_copy_label, 3282 .mpo_pipe_create = mls_pipe_create, 3283 .mpo_pipe_destroy_label = mls_destroy_label, 3284 .mpo_pipe_externalize_label = mls_externalize_label, 3285 .mpo_pipe_init_label = mls_init_label, 3286 .mpo_pipe_internalize_label = mls_internalize_label, 3287 .mpo_pipe_relabel = mls_pipe_relabel, 3288 3289 .mpo_posixsem_check_getvalue = mls_posixsem_check_rdonly, 3290 .mpo_posixsem_check_open = mls_posixsem_check_openunlink, 3291 .mpo_posixsem_check_post = mls_posixsem_check_write, 3292 .mpo_posixsem_check_setmode = mls_posixsem_check_setmode, 3293 .mpo_posixsem_check_setowner = mls_posixsem_check_setowner, 3294 .mpo_posixsem_check_stat = mls_posixsem_check_rdonly, 3295 .mpo_posixsem_check_unlink = mls_posixsem_check_openunlink, 3296 .mpo_posixsem_check_wait = mls_posixsem_check_write, 3297 .mpo_posixsem_create = mls_posixsem_create, 3298 .mpo_posixsem_destroy_label = mls_destroy_label, 3299 .mpo_posixsem_init_label = mls_init_label, 3300 3301 .mpo_posixshm_check_mmap = mls_posixshm_check_mmap, 3302 .mpo_posixshm_check_open = mls_posixshm_check_open, 3303 .mpo_posixshm_check_read = mls_posixshm_check_read, 3304 .mpo_posixshm_check_setmode = mls_posixshm_check_setmode, 3305 .mpo_posixshm_check_setowner = mls_posixshm_check_setowner, 3306 .mpo_posixshm_check_stat = mls_posixshm_check_stat, 3307 .mpo_posixshm_check_truncate = mls_posixshm_check_truncate, 3308 .mpo_posixshm_check_unlink = mls_posixshm_check_unlink, 3309 .mpo_posixshm_check_write = mls_posixshm_check_write, 3310 .mpo_posixshm_create = mls_posixshm_create, 3311 .mpo_posixshm_destroy_label = mls_destroy_label, 3312 .mpo_posixshm_init_label = mls_init_label, 3313 3314 .mpo_proc_check_debug = mls_proc_check_debug, 3315 .mpo_proc_check_sched = mls_proc_check_sched, 3316 .mpo_proc_check_signal = mls_proc_check_signal, 3317 3318 .mpo_socket_check_deliver = mls_socket_check_deliver, 3319 .mpo_socket_check_relabel = mls_socket_check_relabel, 3320 .mpo_socket_check_visible = mls_socket_check_visible, 3321 .mpo_socket_copy_label = mls_copy_label, 3322 .mpo_socket_create = mls_socket_create, 3323 .mpo_socket_create_mbuf = mls_socket_create_mbuf, 3324 .mpo_socket_destroy_label = mls_destroy_label, 3325 .mpo_socket_externalize_label = mls_externalize_label, 3326 .mpo_socket_init_label = mls_init_label_waitcheck, 3327 .mpo_socket_internalize_label = mls_internalize_label, 3328 .mpo_socket_newconn = mls_socket_newconn, 3329 .mpo_socket_relabel = mls_socket_relabel, 3330 3331 .mpo_socketpeer_destroy_label = mls_destroy_label, 3332 .mpo_socketpeer_externalize_label = mls_externalize_label, 3333 .mpo_socketpeer_init_label = mls_init_label_waitcheck, 3334 .mpo_socketpeer_set_from_mbuf = mls_socketpeer_set_from_mbuf, 3335 .mpo_socketpeer_set_from_socket = mls_socketpeer_set_from_socket, 3336 3337 .mpo_syncache_create = mls_syncache_create, 3338 .mpo_syncache_create_mbuf = mls_syncache_create_mbuf, 3339 .mpo_syncache_destroy_label = mls_destroy_label, 3340 .mpo_syncache_init_label = mls_init_label_waitcheck, 3341 3342 .mpo_sysvmsg_cleanup = mls_sysvmsg_cleanup, 3343 .mpo_sysvmsg_create = mls_sysvmsg_create, 3344 .mpo_sysvmsg_destroy_label = mls_destroy_label, 3345 .mpo_sysvmsg_init_label = mls_init_label, 3346 3347 .mpo_sysvmsq_check_msgrcv = mls_sysvmsq_check_msgrcv, 3348 .mpo_sysvmsq_check_msgrmid = mls_sysvmsq_check_msgrmid, 3349 .mpo_sysvmsq_check_msqget = mls_sysvmsq_check_msqget, 3350 .mpo_sysvmsq_check_msqsnd = mls_sysvmsq_check_msqsnd, 3351 .mpo_sysvmsq_check_msqrcv = mls_sysvmsq_check_msqrcv, 3352 .mpo_sysvmsq_check_msqctl = mls_sysvmsq_check_msqctl, 3353 .mpo_sysvmsq_cleanup = mls_sysvmsq_cleanup, 3354 .mpo_sysvmsq_destroy_label = mls_destroy_label, 3355 .mpo_sysvmsq_init_label = mls_init_label, 3356 .mpo_sysvmsq_create = mls_sysvmsq_create, 3357 3358 .mpo_sysvsem_check_semctl = mls_sysvsem_check_semctl, 3359 .mpo_sysvsem_check_semget = mls_sysvsem_check_semget, 3360 .mpo_sysvsem_check_semop = mls_sysvsem_check_semop, 3361 .mpo_sysvsem_cleanup = mls_sysvsem_cleanup, 3362 .mpo_sysvsem_create = mls_sysvsem_create, 3363 .mpo_sysvsem_destroy_label = mls_destroy_label, 3364 .mpo_sysvsem_init_label = mls_init_label, 3365 3366 .mpo_sysvshm_check_shmat = mls_sysvshm_check_shmat, 3367 .mpo_sysvshm_check_shmctl = mls_sysvshm_check_shmctl, 3368 .mpo_sysvshm_check_shmget = mls_sysvshm_check_shmget, 3369 .mpo_sysvshm_cleanup = mls_sysvshm_cleanup, 3370 .mpo_sysvshm_create = mls_sysvshm_create, 3371 .mpo_sysvshm_destroy_label = mls_destroy_label, 3372 .mpo_sysvshm_init_label = mls_init_label, 3373 3374 3375 .mpo_system_check_acct = mls_system_check_acct, 3376 .mpo_system_check_auditctl = mls_system_check_auditctl, 3377 .mpo_system_check_swapon = mls_system_check_swapon, 3378 3379 .mpo_vnode_associate_extattr = mls_vnode_associate_extattr, 3380 .mpo_vnode_associate_singlelabel = mls_vnode_associate_singlelabel, 3381 .mpo_vnode_check_access = mls_vnode_check_open, 3382 .mpo_vnode_check_chdir = mls_vnode_check_chdir, 3383 .mpo_vnode_check_chroot = mls_vnode_check_chroot, 3384 .mpo_vnode_check_create = mls_vnode_check_create, 3385 .mpo_vnode_check_deleteacl = mls_vnode_check_deleteacl, 3386 .mpo_vnode_check_deleteextattr = mls_vnode_check_deleteextattr, 3387 .mpo_vnode_check_exec = mls_vnode_check_exec, 3388 .mpo_vnode_check_getacl = mls_vnode_check_getacl, 3389 .mpo_vnode_check_getextattr = mls_vnode_check_getextattr, 3390 .mpo_vnode_check_link = mls_vnode_check_link, 3391 .mpo_vnode_check_listextattr = mls_vnode_check_listextattr, 3392 .mpo_vnode_check_lookup = mls_vnode_check_lookup, 3393 .mpo_vnode_check_mmap = mls_vnode_check_mmap, 3394 .mpo_vnode_check_open = mls_vnode_check_open, 3395 .mpo_vnode_check_poll = mls_vnode_check_poll, 3396 .mpo_vnode_check_read = mls_vnode_check_read, 3397 .mpo_vnode_check_readdir = mls_vnode_check_readdir, 3398 .mpo_vnode_check_readlink = mls_vnode_check_readlink, 3399 .mpo_vnode_check_relabel = mls_vnode_check_relabel, 3400 .mpo_vnode_check_rename_from = mls_vnode_check_rename_from, 3401 .mpo_vnode_check_rename_to = mls_vnode_check_rename_to, 3402 .mpo_vnode_check_revoke = mls_vnode_check_revoke, 3403 .mpo_vnode_check_setacl = mls_vnode_check_setacl, 3404 .mpo_vnode_check_setextattr = mls_vnode_check_setextattr, 3405 .mpo_vnode_check_setflags = mls_vnode_check_setflags, 3406 .mpo_vnode_check_setmode = mls_vnode_check_setmode, 3407 .mpo_vnode_check_setowner = mls_vnode_check_setowner, 3408 .mpo_vnode_check_setutimes = mls_vnode_check_setutimes, 3409 .mpo_vnode_check_stat = mls_vnode_check_stat, 3410 .mpo_vnode_check_unlink = mls_vnode_check_unlink, 3411 .mpo_vnode_check_write = mls_vnode_check_write, 3412 .mpo_vnode_copy_label = mls_copy_label, 3413 .mpo_vnode_create_extattr = mls_vnode_create_extattr, 3414 .mpo_vnode_destroy_label = mls_destroy_label, 3415 .mpo_vnode_externalize_label = mls_externalize_label, 3416 .mpo_vnode_init_label = mls_init_label, 3417 .mpo_vnode_internalize_label = mls_internalize_label, 3418 .mpo_vnode_relabel = mls_vnode_relabel, 3419 .mpo_vnode_setlabel_extattr = mls_vnode_setlabel_extattr, 3420 }; 3421 3422 MAC_POLICY_SET(&mls_ops, mac_mls, "TrustedBSD MAC/MLS", 3423 MPC_LOADTIME_FLAG_NOTLATE, &mls_slot);
Cache object: 4c5b5edb8f2b50d8b3c0245d85154f90
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