1 /*- 2 * Copyright (c) 1999-2002, 2007-2009 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 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * $FreeBSD$ 39 */ 40 41 /* 42 * Developed by the TrustedBSD Project. 43 * 44 * Biba fixed label mandatory integrity policy. 45 */ 46 47 #include <sys/param.h> 48 #include <sys/conf.h> 49 #include <sys/extattr.h> 50 #include <sys/kernel.h> 51 #include <sys/ksem.h> 52 #include <sys/malloc.h> 53 #include <sys/mman.h> 54 #include <sys/mount.h> 55 #include <sys/priv.h> 56 #include <sys/proc.h> 57 #include <sys/sbuf.h> 58 #include <sys/systm.h> 59 #include <sys/sysproto.h> 60 #include <sys/sysent.h> 61 #include <sys/systm.h> 62 #include <sys/vnode.h> 63 #include <sys/file.h> 64 #include <sys/socket.h> 65 #include <sys/socketvar.h> 66 #include <sys/pipe.h> 67 #include <sys/sx.h> 68 #include <sys/sysctl.h> 69 #include <sys/msg.h> 70 #include <sys/sem.h> 71 #include <sys/shm.h> 72 73 #include <fs/devfs/devfs.h> 74 75 #include <net/bpfdesc.h> 76 #include <net/if.h> 77 #include <net/if_types.h> 78 #include <net/if_var.h> 79 80 #include <netinet/in.h> 81 #include <netinet/in_pcb.h> 82 #include <netinet/ip_var.h> 83 84 #include <vm/uma.h> 85 #include <vm/vm.h> 86 87 #include <security/mac/mac_policy.h> 88 #include <security/mac_biba/mac_biba.h> 89 90 SYSCTL_DECL(_security_mac); 91 92 SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0, 93 "TrustedBSD mac_biba policy controls"); 94 95 static int biba_label_size = sizeof(struct mac_biba); 96 SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD, 97 &biba_label_size, 0, "Size of struct mac_biba"); 98 99 static int biba_enabled = 1; 100 SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, &biba_enabled, 101 0, "Enforce MAC/Biba policy"); 102 TUNABLE_INT("security.mac.biba.enabled", &biba_enabled); 103 104 static int destroyed_not_inited; 105 SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 106 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 107 108 static int trust_all_interfaces = 0; 109 SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, 110 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); 111 TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces); 112 113 static char trusted_interfaces[128]; 114 SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD, 115 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); 116 TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces, 117 sizeof(trusted_interfaces)); 118 119 static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS; 120 SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD, 121 &max_compartments, 0, "Maximum supported compartments"); 122 123 static int ptys_equal = 0; 124 SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, &ptys_equal, 125 0, "Label pty devices as biba/equal on create"); 126 TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal); 127 128 static int interfaces_equal = 1; 129 SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RW, 130 &interfaces_equal, 0, "Label network interfaces as biba/equal on create"); 131 TUNABLE_INT("security.mac.biba.interfaces_equal", &interfaces_equal); 132 133 static int revocation_enabled = 0; 134 SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW, 135 &revocation_enabled, 0, "Revoke access to objects on relabel"); 136 TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled); 137 138 static int biba_slot; 139 #define SLOT(l) ((struct mac_biba *)mac_label_get((l), biba_slot)) 140 #define SLOT_SET(l, val) mac_label_set((l), biba_slot, (uintptr_t)(val)) 141 142 static uma_zone_t zone_biba; 143 144 static __inline int 145 biba_bit_set_empty(u_char *set) { 146 int i; 147 148 for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++) 149 if (set[i] != 0) 150 return (0); 151 return (1); 152 } 153 154 static struct mac_biba * 155 biba_alloc(int flag) 156 { 157 158 return (uma_zalloc(zone_biba, flag | M_ZERO)); 159 } 160 161 static void 162 biba_free(struct mac_biba *mb) 163 { 164 165 if (mb != NULL) 166 uma_zfree(zone_biba, mb); 167 else 168 atomic_add_int(&destroyed_not_inited, 1); 169 } 170 171 static int 172 biba_atmostflags(struct mac_biba *mb, int flags) 173 { 174 175 if ((mb->mb_flags & flags) != mb->mb_flags) 176 return (EINVAL); 177 return (0); 178 } 179 180 static int 181 biba_dominate_element(struct mac_biba_element *a, struct mac_biba_element *b) 182 { 183 int bit; 184 185 switch (a->mbe_type) { 186 case MAC_BIBA_TYPE_EQUAL: 187 case MAC_BIBA_TYPE_HIGH: 188 return (1); 189 190 case MAC_BIBA_TYPE_LOW: 191 switch (b->mbe_type) { 192 case MAC_BIBA_TYPE_GRADE: 193 case MAC_BIBA_TYPE_HIGH: 194 return (0); 195 196 case MAC_BIBA_TYPE_EQUAL: 197 case MAC_BIBA_TYPE_LOW: 198 return (1); 199 200 default: 201 panic("biba_dominate_element: b->mbe_type invalid"); 202 } 203 204 case MAC_BIBA_TYPE_GRADE: 205 switch (b->mbe_type) { 206 case MAC_BIBA_TYPE_EQUAL: 207 case MAC_BIBA_TYPE_LOW: 208 return (1); 209 210 case MAC_BIBA_TYPE_HIGH: 211 return (0); 212 213 case MAC_BIBA_TYPE_GRADE: 214 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) 215 if (!MAC_BIBA_BIT_TEST(bit, 216 a->mbe_compartments) && 217 MAC_BIBA_BIT_TEST(bit, b->mbe_compartments)) 218 return (0); 219 return (a->mbe_grade >= b->mbe_grade); 220 221 default: 222 panic("biba_dominate_element: b->mbe_type invalid"); 223 } 224 225 default: 226 panic("biba_dominate_element: a->mbe_type invalid"); 227 } 228 229 return (0); 230 } 231 232 static int 233 biba_subject_dominate_high(struct mac_biba *mb) 234 { 235 struct mac_biba_element *element; 236 237 KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 238 ("biba_effective_in_range: mb not effective")); 239 element = &mb->mb_effective; 240 241 return (element->mbe_type == MAC_BIBA_TYPE_EQUAL || 242 element->mbe_type == MAC_BIBA_TYPE_HIGH); 243 } 244 245 static int 246 biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb) 247 { 248 249 return (biba_dominate_element(&rangeb->mb_rangehigh, 250 &rangea->mb_rangehigh) && 251 biba_dominate_element(&rangea->mb_rangelow, 252 &rangeb->mb_rangelow)); 253 } 254 255 static int 256 biba_effective_in_range(struct mac_biba *effective, struct mac_biba *range) 257 { 258 259 KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 260 ("biba_effective_in_range: a not effective")); 261 KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 262 ("biba_effective_in_range: b not range")); 263 264 return (biba_dominate_element(&range->mb_rangehigh, 265 &effective->mb_effective) && 266 biba_dominate_element(&effective->mb_effective, 267 &range->mb_rangelow)); 268 269 return (1); 270 } 271 272 static int 273 biba_dominate_effective(struct mac_biba *a, struct mac_biba *b) 274 { 275 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 276 ("biba_dominate_effective: a not effective")); 277 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 278 ("biba_dominate_effective: b not effective")); 279 280 return (biba_dominate_element(&a->mb_effective, &b->mb_effective)); 281 } 282 283 static int 284 biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b) 285 { 286 287 if (a->mbe_type == MAC_BIBA_TYPE_EQUAL || 288 b->mbe_type == MAC_BIBA_TYPE_EQUAL) 289 return (1); 290 291 return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade); 292 } 293 294 static int 295 biba_equal_effective(struct mac_biba *a, struct mac_biba *b) 296 { 297 298 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 299 ("biba_equal_effective: a not effective")); 300 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 301 ("biba_equal_effective: b not effective")); 302 303 return (biba_equal_element(&a->mb_effective, &b->mb_effective)); 304 } 305 306 static int 307 biba_contains_equal(struct mac_biba *mb) 308 { 309 310 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 311 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL) 312 return (1); 313 } 314 315 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) { 316 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL) 317 return (1); 318 if (mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 319 return (1); 320 } 321 322 return (0); 323 } 324 325 static int 326 biba_subject_privileged(struct mac_biba *mb) 327 { 328 329 KASSERT((mb->mb_flags & MAC_BIBA_FLAGS_BOTH) == MAC_BIBA_FLAGS_BOTH, 330 ("biba_subject_privileged: subject doesn't have both labels")); 331 332 /* If the effective is EQUAL, it's ok. */ 333 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL) 334 return (0); 335 336 /* If either range endpoint is EQUAL, it's ok. */ 337 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL || 338 mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 339 return (0); 340 341 /* If the range is low-high, it's ok. */ 342 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW && 343 mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH) 344 return (0); 345 346 /* It's not ok. */ 347 return (EPERM); 348 } 349 350 static int 351 biba_high_effective(struct mac_biba *mb) 352 { 353 354 KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 355 ("biba_equal_effective: mb not effective")); 356 357 return (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH); 358 } 359 360 static int 361 biba_valid(struct mac_biba *mb) 362 { 363 364 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 365 switch (mb->mb_effective.mbe_type) { 366 case MAC_BIBA_TYPE_GRADE: 367 break; 368 369 case MAC_BIBA_TYPE_EQUAL: 370 case MAC_BIBA_TYPE_HIGH: 371 case MAC_BIBA_TYPE_LOW: 372 if (mb->mb_effective.mbe_grade != 0 || 373 !MAC_BIBA_BIT_SET_EMPTY( 374 mb->mb_effective.mbe_compartments)) 375 return (EINVAL); 376 break; 377 378 default: 379 return (EINVAL); 380 } 381 } else { 382 if (mb->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF) 383 return (EINVAL); 384 } 385 386 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) { 387 switch (mb->mb_rangelow.mbe_type) { 388 case MAC_BIBA_TYPE_GRADE: 389 break; 390 391 case MAC_BIBA_TYPE_EQUAL: 392 case MAC_BIBA_TYPE_HIGH: 393 case MAC_BIBA_TYPE_LOW: 394 if (mb->mb_rangelow.mbe_grade != 0 || 395 !MAC_BIBA_BIT_SET_EMPTY( 396 mb->mb_rangelow.mbe_compartments)) 397 return (EINVAL); 398 break; 399 400 default: 401 return (EINVAL); 402 } 403 404 switch (mb->mb_rangehigh.mbe_type) { 405 case MAC_BIBA_TYPE_GRADE: 406 break; 407 408 case MAC_BIBA_TYPE_EQUAL: 409 case MAC_BIBA_TYPE_HIGH: 410 case MAC_BIBA_TYPE_LOW: 411 if (mb->mb_rangehigh.mbe_grade != 0 || 412 !MAC_BIBA_BIT_SET_EMPTY( 413 mb->mb_rangehigh.mbe_compartments)) 414 return (EINVAL); 415 break; 416 417 default: 418 return (EINVAL); 419 } 420 if (!biba_dominate_element(&mb->mb_rangehigh, 421 &mb->mb_rangelow)) 422 return (EINVAL); 423 } else { 424 if (mb->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF || 425 mb->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF) 426 return (EINVAL); 427 } 428 429 return (0); 430 } 431 432 static void 433 biba_set_range(struct mac_biba *mb, u_short typelow, u_short gradelow, 434 u_char *compartmentslow, u_short typehigh, u_short gradehigh, 435 u_char *compartmentshigh) 436 { 437 438 mb->mb_rangelow.mbe_type = typelow; 439 mb->mb_rangelow.mbe_grade = gradelow; 440 if (compartmentslow != NULL) 441 memcpy(mb->mb_rangelow.mbe_compartments, compartmentslow, 442 sizeof(mb->mb_rangelow.mbe_compartments)); 443 mb->mb_rangehigh.mbe_type = typehigh; 444 mb->mb_rangehigh.mbe_grade = gradehigh; 445 if (compartmentshigh != NULL) 446 memcpy(mb->mb_rangehigh.mbe_compartments, compartmentshigh, 447 sizeof(mb->mb_rangehigh.mbe_compartments)); 448 mb->mb_flags |= MAC_BIBA_FLAG_RANGE; 449 } 450 451 static void 452 biba_set_effective(struct mac_biba *mb, u_short type, u_short grade, 453 u_char *compartments) 454 { 455 456 mb->mb_effective.mbe_type = type; 457 mb->mb_effective.mbe_grade = grade; 458 if (compartments != NULL) 459 memcpy(mb->mb_effective.mbe_compartments, compartments, 460 sizeof(mb->mb_effective.mbe_compartments)); 461 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; 462 } 463 464 static void 465 biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto) 466 { 467 468 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 469 ("biba_copy_range: labelfrom not range")); 470 471 labelto->mb_rangelow = labelfrom->mb_rangelow; 472 labelto->mb_rangehigh = labelfrom->mb_rangehigh; 473 labelto->mb_flags |= MAC_BIBA_FLAG_RANGE; 474 } 475 476 static void 477 biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto) 478 { 479 480 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 481 ("biba_copy_effective: labelfrom not effective")); 482 483 labelto->mb_effective = labelfrom->mb_effective; 484 labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; 485 } 486 487 static void 488 biba_copy(struct mac_biba *source, struct mac_biba *dest) 489 { 490 491 if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) 492 biba_copy_effective(source, dest); 493 if (source->mb_flags & MAC_BIBA_FLAG_RANGE) 494 biba_copy_range(source, dest); 495 } 496 497 /* 498 * Policy module operations. 499 */ 500 static void 501 biba_init(struct mac_policy_conf *conf) 502 { 503 504 zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL, 505 NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 506 } 507 508 /* 509 * Label operations. 510 */ 511 static void 512 biba_init_label(struct label *label) 513 { 514 515 SLOT_SET(label, biba_alloc(M_WAITOK)); 516 } 517 518 static int 519 biba_init_label_waitcheck(struct label *label, int flag) 520 { 521 522 SLOT_SET(label, biba_alloc(flag)); 523 if (SLOT(label) == NULL) 524 return (ENOMEM); 525 526 return (0); 527 } 528 529 static void 530 biba_destroy_label(struct label *label) 531 { 532 533 biba_free(SLOT(label)); 534 SLOT_SET(label, NULL); 535 } 536 537 /* 538 * biba_element_to_string() accepts an sbuf and Biba element. It converts 539 * the Biba element to a string and stores the result in the sbuf; if there 540 * isn't space in the sbuf, -1 is returned. 541 */ 542 static int 543 biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element) 544 { 545 int i, first; 546 547 switch (element->mbe_type) { 548 case MAC_BIBA_TYPE_HIGH: 549 return (sbuf_printf(sb, "high")); 550 551 case MAC_BIBA_TYPE_LOW: 552 return (sbuf_printf(sb, "low")); 553 554 case MAC_BIBA_TYPE_EQUAL: 555 return (sbuf_printf(sb, "equal")); 556 557 case MAC_BIBA_TYPE_GRADE: 558 if (sbuf_printf(sb, "%d", element->mbe_grade) == -1) 559 return (-1); 560 561 first = 1; 562 for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) { 563 if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) { 564 if (first) { 565 if (sbuf_putc(sb, ':') == -1) 566 return (-1); 567 if (sbuf_printf(sb, "%d", i) == -1) 568 return (-1); 569 first = 0; 570 } else { 571 if (sbuf_printf(sb, "+%d", i) == -1) 572 return (-1); 573 } 574 } 575 } 576 return (0); 577 578 default: 579 panic("biba_element_to_string: invalid type (%d)", 580 element->mbe_type); 581 } 582 } 583 584 /* 585 * biba_to_string() converts a Biba label to a string, and places the results 586 * in the passed sbuf. It returns 0 on success, or EINVAL if there isn't 587 * room in the sbuf. Note: the sbuf will be modified even in a failure case, 588 * so the caller may need to revert the sbuf by restoring the offset if 589 * that's undesired. 590 */ 591 static int 592 biba_to_string(struct sbuf *sb, struct mac_biba *mb) 593 { 594 595 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 596 if (biba_element_to_string(sb, &mb->mb_effective) == -1) 597 return (EINVAL); 598 } 599 600 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) { 601 if (sbuf_putc(sb, '(') == -1) 602 return (EINVAL); 603 604 if (biba_element_to_string(sb, &mb->mb_rangelow) == -1) 605 return (EINVAL); 606 607 if (sbuf_putc(sb, '-') == -1) 608 return (EINVAL); 609 610 if (biba_element_to_string(sb, &mb->mb_rangehigh) == -1) 611 return (EINVAL); 612 613 if (sbuf_putc(sb, ')') == -1) 614 return (EINVAL); 615 } 616 617 return (0); 618 } 619 620 static int 621 biba_externalize_label(struct label *label, char *element_name, 622 struct sbuf *sb, int *claimed) 623 { 624 struct mac_biba *mb; 625 626 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 627 return (0); 628 629 (*claimed)++; 630 631 mb = SLOT(label); 632 return (biba_to_string(sb, mb)); 633 } 634 635 static int 636 biba_parse_element(struct mac_biba_element *element, char *string) 637 { 638 char *compartment, *end, *grade; 639 int value; 640 641 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) { 642 element->mbe_type = MAC_BIBA_TYPE_HIGH; 643 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 644 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) { 645 element->mbe_type = MAC_BIBA_TYPE_LOW; 646 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 647 } else if (strcmp(string, "equal") == 0 || 648 strcmp(string, "eq") == 0) { 649 element->mbe_type = MAC_BIBA_TYPE_EQUAL; 650 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 651 } else { 652 element->mbe_type = MAC_BIBA_TYPE_GRADE; 653 654 /* 655 * Numeric grade piece of the element. 656 */ 657 grade = strsep(&string, ":"); 658 value = strtol(grade, &end, 10); 659 if (end == grade || *end != '\0') 660 return (EINVAL); 661 if (value < 0 || value > 65535) 662 return (EINVAL); 663 element->mbe_grade = value; 664 665 /* 666 * Optional compartment piece of the element. If none are 667 * included, we assume that the label has no compartments. 668 */ 669 if (string == NULL) 670 return (0); 671 if (*string == '\0') 672 return (0); 673 674 while ((compartment = strsep(&string, "+")) != NULL) { 675 value = strtol(compartment, &end, 10); 676 if (compartment == end || *end != '\0') 677 return (EINVAL); 678 if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS) 679 return (EINVAL); 680 MAC_BIBA_BIT_SET(value, element->mbe_compartments); 681 } 682 } 683 684 return (0); 685 } 686 687 /* 688 * Note: destructively consumes the string, make a local copy before calling 689 * if that's a problem. 690 */ 691 static int 692 biba_parse(struct mac_biba *mb, char *string) 693 { 694 char *rangehigh, *rangelow, *effective; 695 int error; 696 697 effective = strsep(&string, "("); 698 if (*effective == '\0') 699 effective = NULL; 700 701 if (string != NULL) { 702 rangelow = strsep(&string, "-"); 703 if (string == NULL) 704 return (EINVAL); 705 rangehigh = strsep(&string, ")"); 706 if (string == NULL) 707 return (EINVAL); 708 if (*string != '\0') 709 return (EINVAL); 710 } else { 711 rangelow = NULL; 712 rangehigh = NULL; 713 } 714 715 KASSERT((rangelow != NULL && rangehigh != NULL) || 716 (rangelow == NULL && rangehigh == NULL), 717 ("biba_parse: range mismatch")); 718 719 bzero(mb, sizeof(*mb)); 720 if (effective != NULL) { 721 error = biba_parse_element(&mb->mb_effective, effective); 722 if (error) 723 return (error); 724 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; 725 } 726 727 if (rangelow != NULL) { 728 error = biba_parse_element(&mb->mb_rangelow, rangelow); 729 if (error) 730 return (error); 731 error = biba_parse_element(&mb->mb_rangehigh, rangehigh); 732 if (error) 733 return (error); 734 mb->mb_flags |= MAC_BIBA_FLAG_RANGE; 735 } 736 737 error = biba_valid(mb); 738 if (error) 739 return (error); 740 741 return (0); 742 } 743 744 static int 745 biba_internalize_label(struct label *label, char *element_name, 746 char *element_data, int *claimed) 747 { 748 struct mac_biba *mb, mb_temp; 749 int error; 750 751 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 752 return (0); 753 754 (*claimed)++; 755 756 error = biba_parse(&mb_temp, element_data); 757 if (error) 758 return (error); 759 760 mb = SLOT(label); 761 *mb = mb_temp; 762 763 return (0); 764 } 765 766 static void 767 biba_copy_label(struct label *src, struct label *dest) 768 { 769 770 *SLOT(dest) = *SLOT(src); 771 } 772 773 /* 774 * Object-specific entry point implementations are sorted alphabetically by 775 * object type name and then by operation. 776 */ 777 static int 778 biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 779 struct ifnet *ifp, struct label *ifplabel) 780 { 781 struct mac_biba *a, *b; 782 783 if (!biba_enabled) 784 return (0); 785 786 a = SLOT(dlabel); 787 b = SLOT(ifplabel); 788 789 if (biba_equal_effective(a, b)) 790 return (0); 791 return (EACCES); 792 } 793 794 static void 795 biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d, 796 struct label *dlabel) 797 { 798 struct mac_biba *source, *dest; 799 800 source = SLOT(cred->cr_label); 801 dest = SLOT(dlabel); 802 803 biba_copy_effective(source, dest); 804 } 805 806 static void 807 biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, 808 struct mbuf *m, struct label *mlabel) 809 { 810 struct mac_biba *source, *dest; 811 812 source = SLOT(dlabel); 813 dest = SLOT(mlabel); 814 815 biba_copy_effective(source, dest); 816 } 817 818 static void 819 biba_cred_associate_nfsd(struct ucred *cred) 820 { 821 struct mac_biba *label; 822 823 label = SLOT(cred->cr_label); 824 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); 825 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 826 0, NULL); 827 } 828 829 static int 830 biba_cred_check_relabel(struct ucred *cred, struct label *newlabel) 831 { 832 struct mac_biba *subj, *new; 833 int error; 834 835 subj = SLOT(cred->cr_label); 836 new = SLOT(newlabel); 837 838 /* 839 * If there is a Biba label update for the credential, it may 840 * be an update of the effective, range, or both. 841 */ 842 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 843 if (error) 844 return (error); 845 846 /* 847 * If the Biba label is to be changed, authorize as appropriate. 848 */ 849 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 850 /* 851 * If the change request modifies both the Biba label 852 * effective and range, check that the new effective will be 853 * in the new range. 854 */ 855 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 856 MAC_BIBA_FLAGS_BOTH && 857 !biba_effective_in_range(new, new)) 858 return (EINVAL); 859 860 /* 861 * To change the Biba effective label on a credential, the 862 * new effective label must be in the current range. 863 */ 864 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && 865 !biba_effective_in_range(new, subj)) 866 return (EPERM); 867 868 /* 869 * To change the Biba range on a credential, the new range 870 * label must be in the current range. 871 */ 872 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 873 !biba_range_in_range(new, subj)) 874 return (EPERM); 875 876 /* 877 * To have EQUAL in any component of the new credential Biba 878 * label, the subject must already have EQUAL in their label. 879 */ 880 if (biba_contains_equal(new)) { 881 error = biba_subject_privileged(subj); 882 if (error) 883 return (error); 884 } 885 } 886 887 return (0); 888 } 889 890 static int 891 biba_cred_check_visible(struct ucred *u1, struct ucred *u2) 892 { 893 struct mac_biba *subj, *obj; 894 895 if (!biba_enabled) 896 return (0); 897 898 subj = SLOT(u1->cr_label); 899 obj = SLOT(u2->cr_label); 900 901 /* XXX: range */ 902 if (!biba_dominate_effective(obj, subj)) 903 return (ESRCH); 904 905 return (0); 906 } 907 908 static void 909 biba_cred_create_init(struct ucred *cred) 910 { 911 struct mac_biba *dest; 912 913 dest = SLOT(cred->cr_label); 914 915 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 916 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 917 0, NULL); 918 } 919 920 static void 921 biba_cred_create_swapper(struct ucred *cred) 922 { 923 struct mac_biba *dest; 924 925 dest = SLOT(cred->cr_label); 926 927 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 928 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 929 0, NULL); 930 } 931 932 static void 933 biba_cred_relabel(struct ucred *cred, struct label *newlabel) 934 { 935 struct mac_biba *source, *dest; 936 937 source = SLOT(newlabel); 938 dest = SLOT(cred->cr_label); 939 940 biba_copy(source, dest); 941 } 942 943 static void 944 biba_devfs_create_device(struct ucred *cred, struct mount *mp, 945 struct cdev *dev, struct devfs_dirent *de, struct label *delabel) 946 { 947 struct mac_biba *mb; 948 int biba_type; 949 950 mb = SLOT(delabel); 951 if (strcmp(dev->si_name, "null") == 0 || 952 strcmp(dev->si_name, "zero") == 0 || 953 strcmp(dev->si_name, "random") == 0 || 954 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 955 biba_type = MAC_BIBA_TYPE_EQUAL; 956 else if (ptys_equal && 957 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 958 strncmp(dev->si_name, "pts/", strlen("pts/")) == 0 || 959 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 960 biba_type = MAC_BIBA_TYPE_EQUAL; 961 else 962 biba_type = MAC_BIBA_TYPE_HIGH; 963 biba_set_effective(mb, biba_type, 0, NULL); 964 } 965 966 static void 967 biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 968 struct devfs_dirent *de, struct label *delabel) 969 { 970 struct mac_biba *mb; 971 972 mb = SLOT(delabel); 973 974 biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL); 975 } 976 977 static void 978 biba_devfs_create_symlink(struct ucred *cred, struct mount *mp, 979 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 980 struct label *delabel) 981 { 982 struct mac_biba *source, *dest; 983 984 source = SLOT(cred->cr_label); 985 dest = SLOT(delabel); 986 987 biba_copy_effective(source, dest); 988 } 989 990 static void 991 biba_devfs_update(struct mount *mp, struct devfs_dirent *de, 992 struct label *delabel, struct vnode *vp, struct label *vplabel) 993 { 994 struct mac_biba *source, *dest; 995 996 source = SLOT(vplabel); 997 dest = SLOT(delabel); 998 999 biba_copy(source, dest); 1000 } 1001 1002 static void 1003 biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel, 1004 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 1005 struct label *vplabel) 1006 { 1007 struct mac_biba *source, *dest; 1008 1009 source = SLOT(delabel); 1010 dest = SLOT(vplabel); 1011 1012 biba_copy_effective(source, dest); 1013 } 1014 1015 static int 1016 biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1017 struct label *ifplabel, struct label *newlabel) 1018 { 1019 struct mac_biba *subj, *new; 1020 int error; 1021 1022 subj = SLOT(cred->cr_label); 1023 new = SLOT(newlabel); 1024 1025 /* 1026 * If there is a Biba label update for the interface, it may be an 1027 * update of the effective, range, or both. 1028 */ 1029 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1030 if (error) 1031 return (error); 1032 1033 /* 1034 * Relabling network interfaces requires Biba privilege. 1035 */ 1036 error = biba_subject_privileged(subj); 1037 if (error) 1038 return (error); 1039 1040 return (0); 1041 } 1042 1043 static int 1044 biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1045 struct mbuf *m, struct label *mlabel) 1046 { 1047 struct mac_biba *p, *i; 1048 1049 if (!biba_enabled) 1050 return (0); 1051 1052 p = SLOT(mlabel); 1053 i = SLOT(ifplabel); 1054 1055 return (biba_effective_in_range(p, i) ? 0 : EACCES); 1056 } 1057 1058 static void 1059 biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1060 { 1061 char tifname[IFNAMSIZ], *p, *q; 1062 char tiflist[sizeof(trusted_interfaces)]; 1063 struct mac_biba *dest; 1064 int len, type; 1065 1066 dest = SLOT(ifplabel); 1067 1068 if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) { 1069 type = MAC_BIBA_TYPE_EQUAL; 1070 goto set; 1071 } 1072 1073 if (trust_all_interfaces) { 1074 type = MAC_BIBA_TYPE_HIGH; 1075 goto set; 1076 } 1077 1078 type = MAC_BIBA_TYPE_LOW; 1079 1080 if (trusted_interfaces[0] == '\0' || 1081 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1082 goto set; 1083 1084 bzero(tiflist, sizeof(tiflist)); 1085 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1086 if(*p != ' ' && *p != '\t') 1087 *q = *p; 1088 1089 for (p = q = tiflist;; p++) { 1090 if (*p == ',' || *p == '\0') { 1091 len = p - q; 1092 if (len < IFNAMSIZ) { 1093 bzero(tifname, sizeof(tifname)); 1094 bcopy(q, tifname, len); 1095 if (strcmp(tifname, ifp->if_xname) == 0) { 1096 type = MAC_BIBA_TYPE_HIGH; 1097 break; 1098 } 1099 } else { 1100 *p = '\0'; 1101 printf("mac_biba warning: interface name " 1102 "\"%s\" is too long (must be < %d)\n", 1103 q, IFNAMSIZ); 1104 } 1105 if (*p == '\0') 1106 break; 1107 q = p + 1; 1108 } 1109 } 1110 set: 1111 biba_set_effective(dest, type, 0, NULL); 1112 biba_set_range(dest, type, 0, NULL, type, 0, NULL); 1113 } 1114 1115 static void 1116 biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1117 struct mbuf *m, struct label *mlabel) 1118 { 1119 struct mac_biba *source, *dest; 1120 1121 source = SLOT(ifplabel); 1122 dest = SLOT(mlabel); 1123 1124 biba_copy_effective(source, dest); 1125 } 1126 1127 static void 1128 biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1129 struct label *ifplabel, struct label *newlabel) 1130 { 1131 struct mac_biba *source, *dest; 1132 1133 source = SLOT(newlabel); 1134 dest = SLOT(ifplabel); 1135 1136 biba_copy(source, dest); 1137 } 1138 1139 static int 1140 biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1141 struct mbuf *m, struct label *mlabel) 1142 { 1143 struct mac_biba *p, *i; 1144 1145 if (!biba_enabled) 1146 return (0); 1147 1148 p = SLOT(mlabel); 1149 i = SLOT(inplabel); 1150 1151 return (biba_equal_effective(p, i) ? 0 : EACCES); 1152 } 1153 1154 static int 1155 biba_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, 1156 struct label *inplabel) 1157 { 1158 struct mac_biba *subj, *obj; 1159 1160 if (!biba_enabled) 1161 return (0); 1162 1163 subj = SLOT(cred->cr_label); 1164 obj = SLOT(inplabel); 1165 1166 if (!biba_dominate_effective(obj, subj)) 1167 return (ENOENT); 1168 1169 return (0); 1170 } 1171 1172 static void 1173 biba_inpcb_create(struct socket *so, struct label *solabel, 1174 struct inpcb *inp, struct label *inplabel) 1175 { 1176 struct mac_biba *source, *dest; 1177 1178 source = SLOT(solabel); 1179 dest = SLOT(inplabel); 1180 1181 SOCK_LOCK(so); 1182 biba_copy_effective(source, dest); 1183 SOCK_UNLOCK(so); 1184 } 1185 1186 static void 1187 biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1188 struct mbuf *m, struct label *mlabel) 1189 { 1190 struct mac_biba *source, *dest; 1191 1192 source = SLOT(inplabel); 1193 dest = SLOT(mlabel); 1194 1195 biba_copy_effective(source, dest); 1196 } 1197 1198 static void 1199 biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1200 struct inpcb *inp, struct label *inplabel) 1201 { 1202 struct mac_biba *source, *dest; 1203 1204 SOCK_LOCK_ASSERT(so); 1205 1206 source = SLOT(solabel); 1207 dest = SLOT(inplabel); 1208 1209 biba_copy(source, dest); 1210 } 1211 1212 static void 1213 biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1214 struct label *q6label) 1215 { 1216 struct mac_biba *source, *dest; 1217 1218 source = SLOT(mlabel); 1219 dest = SLOT(q6label); 1220 1221 biba_copy_effective(source, dest); 1222 } 1223 1224 static int 1225 biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1226 struct label *q6label) 1227 { 1228 struct mac_biba *a, *b; 1229 1230 a = SLOT(q6label); 1231 b = SLOT(mlabel); 1232 1233 return (biba_equal_effective(a, b)); 1234 } 1235 1236 static void 1237 biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, 1238 struct label *mlabel) 1239 { 1240 struct mac_biba *source, *dest; 1241 1242 source = SLOT(q6label); 1243 dest = SLOT(mlabel); 1244 1245 /* Just use the head, since we require them all to match. */ 1246 biba_copy_effective(source, dest); 1247 } 1248 1249 static void 1250 biba_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1251 struct label *q6label) 1252 { 1253 1254 /* NOOP: we only accept matching labels, so no need to update */ 1255 } 1256 1257 static void 1258 biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, 1259 struct label *qlabel) 1260 { 1261 struct mac_biba *source, *dest; 1262 1263 source = SLOT(mlabel); 1264 dest = SLOT(qlabel); 1265 1266 biba_copy_effective(source, dest); 1267 } 1268 1269 static int 1270 biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, 1271 struct label *qlabel) 1272 { 1273 struct mac_biba *a, *b; 1274 1275 a = SLOT(qlabel); 1276 b = SLOT(mlabel); 1277 1278 return (biba_equal_effective(a, b)); 1279 } 1280 1281 static void 1282 biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, 1283 struct label *mlabel) 1284 { 1285 struct mac_biba *source, *dest; 1286 1287 source = SLOT(qlabel); 1288 dest = SLOT(mlabel); 1289 1290 /* Just use the head, since we require them all to match. */ 1291 biba_copy_effective(source, dest); 1292 } 1293 1294 static void 1295 biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, 1296 struct label *qlabel) 1297 { 1298 1299 /* NOOP: we only accept matching labels, so no need to update */ 1300 } 1301 1302 static int 1303 biba_kld_check_load(struct ucred *cred, struct vnode *vp, 1304 struct label *vplabel) 1305 { 1306 struct mac_biba *subj, *obj; 1307 int error; 1308 1309 if (!biba_enabled) 1310 return (0); 1311 1312 subj = SLOT(cred->cr_label); 1313 1314 error = biba_subject_privileged(subj); 1315 if (error) 1316 return (error); 1317 1318 obj = SLOT(vplabel); 1319 if (!biba_high_effective(obj)) 1320 return (EACCES); 1321 1322 return (0); 1323 } 1324 1325 static int 1326 biba_mount_check_stat(struct ucred *cred, struct mount *mp, 1327 struct label *mplabel) 1328 { 1329 struct mac_biba *subj, *obj; 1330 1331 if (!biba_enabled) 1332 return (0); 1333 1334 subj = SLOT(cred->cr_label); 1335 obj = SLOT(mplabel); 1336 1337 if (!biba_dominate_effective(obj, subj)) 1338 return (EACCES); 1339 1340 return (0); 1341 } 1342 1343 static void 1344 biba_mount_create(struct ucred *cred, struct mount *mp, 1345 struct label *mplabel) 1346 { 1347 struct mac_biba *source, *dest; 1348 1349 source = SLOT(cred->cr_label); 1350 dest = SLOT(mplabel); 1351 1352 biba_copy_effective(source, dest); 1353 } 1354 1355 static void 1356 biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1357 struct mbuf *m, struct label *mlabel) 1358 { 1359 struct mac_biba *dest; 1360 1361 dest = SLOT(mlabel); 1362 1363 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1364 } 1365 1366 static void 1367 biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1368 struct mbuf *m, struct label *mlabel) 1369 { 1370 struct mac_biba *dest; 1371 1372 dest = SLOT(mlabel); 1373 1374 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1375 } 1376 1377 static void 1378 biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1379 struct mbuf *msend, struct label *msendlabel) 1380 { 1381 struct mac_biba *source, *dest; 1382 1383 source = SLOT(mrecvlabel); 1384 dest = SLOT(msendlabel); 1385 1386 biba_copy_effective(source, dest); 1387 } 1388 1389 static void 1390 biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1391 { 1392 struct mac_biba *dest; 1393 1394 dest = SLOT(mlabel); 1395 1396 /* XXX: where is the label for the firewall really coming from? */ 1397 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1398 } 1399 1400 static void 1401 biba_netinet_fragment(struct mbuf *m, struct label *mlabel, 1402 struct mbuf *frag, struct label *fraglabel) 1403 { 1404 struct mac_biba *source, *dest; 1405 1406 source = SLOT(mlabel); 1407 dest = SLOT(fraglabel); 1408 1409 biba_copy_effective(source, dest); 1410 } 1411 1412 static void 1413 biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1414 struct mbuf *msend, struct label *msendlabel) 1415 { 1416 struct mac_biba *source, *dest; 1417 1418 source = SLOT(mrecvlabel); 1419 dest = SLOT(msendlabel); 1420 1421 biba_copy_effective(source, dest); 1422 } 1423 1424 static void 1425 biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1426 struct mbuf *m, struct label *mlabel) 1427 { 1428 struct mac_biba *dest; 1429 1430 dest = SLOT(mlabel); 1431 1432 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1433 } 1434 1435 static void 1436 biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1437 struct mbuf *m, struct label *mlabel) 1438 { 1439 struct mac_biba *dest; 1440 1441 dest = SLOT(mlabel); 1442 1443 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1444 } 1445 1446 static int 1447 biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1448 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1449 { 1450 1451 if(!biba_enabled) 1452 return (0); 1453 1454 /* XXX: This will be implemented soon... */ 1455 1456 return (0); 1457 } 1458 1459 static int 1460 biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1461 struct label *pplabel) 1462 { 1463 struct mac_biba *subj, *obj; 1464 1465 if (!biba_enabled) 1466 return (0); 1467 1468 subj = SLOT(cred->cr_label); 1469 obj = SLOT(pplabel); 1470 1471 if (!biba_dominate_effective(obj, subj)) 1472 return (EACCES); 1473 1474 return (0); 1475 } 1476 1477 static int 1478 biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1479 struct label *pplabel) 1480 { 1481 struct mac_biba *subj, *obj; 1482 1483 if (!biba_enabled) 1484 return (0); 1485 1486 subj = SLOT(cred->cr_label); 1487 obj = SLOT(pplabel); 1488 1489 if (!biba_dominate_effective(obj, subj)) 1490 return (EACCES); 1491 1492 return (0); 1493 } 1494 1495 static int 1496 biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1497 struct label *pplabel, struct label *newlabel) 1498 { 1499 struct mac_biba *subj, *obj, *new; 1500 int error; 1501 1502 new = SLOT(newlabel); 1503 subj = SLOT(cred->cr_label); 1504 obj = SLOT(pplabel); 1505 1506 /* 1507 * If there is a Biba label update for a pipe, it must be a effective 1508 * update. 1509 */ 1510 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1511 if (error) 1512 return (error); 1513 1514 /* 1515 * To perform a relabel of a pipe (Biba label or not), Biba must 1516 * authorize the relabel. 1517 */ 1518 if (!biba_effective_in_range(obj, subj)) 1519 return (EPERM); 1520 1521 /* 1522 * If the Biba label is to be changed, authorize as appropriate. 1523 */ 1524 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1525 /* 1526 * To change the Biba label on a pipe, the new pipe label 1527 * must be in the subject range. 1528 */ 1529 if (!biba_effective_in_range(new, subj)) 1530 return (EPERM); 1531 1532 /* 1533 * To change the Biba label on a pipe to be EQUAL, the 1534 * subject must have appropriate privilege. 1535 */ 1536 if (biba_contains_equal(new)) { 1537 error = biba_subject_privileged(subj); 1538 if (error) 1539 return (error); 1540 } 1541 } 1542 1543 return (0); 1544 } 1545 1546 static int 1547 biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 1548 struct label *pplabel) 1549 { 1550 struct mac_biba *subj, *obj; 1551 1552 if (!biba_enabled) 1553 return (0); 1554 1555 subj = SLOT(cred->cr_label); 1556 obj = SLOT(pplabel); 1557 1558 if (!biba_dominate_effective(obj, subj)) 1559 return (EACCES); 1560 1561 return (0); 1562 } 1563 1564 static int 1565 biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1566 struct label *pplabel) 1567 { 1568 struct mac_biba *subj, *obj; 1569 1570 if (!biba_enabled) 1571 return (0); 1572 1573 subj = SLOT(cred->cr_label); 1574 obj = SLOT(pplabel); 1575 1576 if (!biba_dominate_effective(subj, obj)) 1577 return (EACCES); 1578 1579 return (0); 1580 } 1581 1582 static void 1583 biba_pipe_create(struct ucred *cred, struct pipepair *pp, 1584 struct label *pplabel) 1585 { 1586 struct mac_biba *source, *dest; 1587 1588 source = SLOT(cred->cr_label); 1589 dest = SLOT(pplabel); 1590 1591 biba_copy_effective(source, dest); 1592 } 1593 1594 static void 1595 biba_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1596 struct label *pplabel, struct label *newlabel) 1597 { 1598 struct mac_biba *source, *dest; 1599 1600 source = SLOT(newlabel); 1601 dest = SLOT(pplabel); 1602 1603 biba_copy(source, dest); 1604 } 1605 1606 static int 1607 biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks, 1608 struct label *kslabel) 1609 { 1610 struct mac_biba *subj, *obj; 1611 1612 if (!biba_enabled) 1613 return (0); 1614 1615 subj = SLOT(cred->cr_label); 1616 obj = SLOT(kslabel); 1617 1618 if (!biba_dominate_effective(subj, obj)) 1619 return (EACCES); 1620 1621 return (0); 1622 } 1623 1624 static int 1625 biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred, 1626 struct ksem *ks, struct label *kslabel) 1627 { 1628 struct mac_biba *subj, *obj; 1629 1630 if (!biba_enabled) 1631 return (0); 1632 1633 subj = SLOT(active_cred->cr_label); 1634 obj = SLOT(kslabel); 1635 1636 if (!biba_dominate_effective(subj, obj)) 1637 return (EACCES); 1638 1639 return (0); 1640 } 1641 1642 static int 1643 biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred, 1644 struct ksem *ks, struct label *kslabel) 1645 { 1646 struct mac_biba *subj, *obj; 1647 1648 if (!biba_enabled) 1649 return (0); 1650 1651 subj = SLOT(active_cred->cr_label); 1652 obj = SLOT(kslabel); 1653 1654 if (!biba_dominate_effective(obj, subj)) 1655 return (EACCES); 1656 1657 return (0); 1658 } 1659 1660 static void 1661 biba_posixsem_create(struct ucred *cred, struct ksem *ks, 1662 struct label *kslabel) 1663 { 1664 struct mac_biba *source, *dest; 1665 1666 source = SLOT(cred->cr_label); 1667 dest = SLOT(kslabel); 1668 1669 biba_copy_effective(source, dest); 1670 } 1671 1672 /* 1673 * Some system privileges are allowed regardless of integrity grade; others 1674 * are allowed only when running with privilege with respect to the Biba 1675 * policy as they might otherwise allow bypassing of the integrity policy. 1676 */ 1677 static int 1678 biba_priv_check(struct ucred *cred, int priv) 1679 { 1680 struct mac_biba *subj; 1681 int error; 1682 1683 if (!biba_enabled) 1684 return (0); 1685 1686 /* 1687 * Exempt only specific privileges from the Biba integrity policy. 1688 */ 1689 switch (priv) { 1690 case PRIV_KTRACE: 1691 case PRIV_MSGBUF: 1692 1693 /* 1694 * Allow processes to manipulate basic process audit properties, and 1695 * to submit audit records. 1696 */ 1697 case PRIV_AUDIT_GETAUDIT: 1698 case PRIV_AUDIT_SETAUDIT: 1699 case PRIV_AUDIT_SUBMIT: 1700 1701 /* 1702 * Allow processes to manipulate their regular UNIX credentials. 1703 */ 1704 case PRIV_CRED_SETUID: 1705 case PRIV_CRED_SETEUID: 1706 case PRIV_CRED_SETGID: 1707 case PRIV_CRED_SETEGID: 1708 case PRIV_CRED_SETGROUPS: 1709 case PRIV_CRED_SETREUID: 1710 case PRIV_CRED_SETREGID: 1711 case PRIV_CRED_SETRESUID: 1712 case PRIV_CRED_SETRESGID: 1713 1714 /* 1715 * Allow processes to perform system monitoring. 1716 */ 1717 case PRIV_SEEOTHERGIDS: 1718 case PRIV_SEEOTHERUIDS: 1719 break; 1720 1721 /* 1722 * Allow access to general process debugging facilities. We 1723 * separately control debugging based on MAC label. 1724 */ 1725 case PRIV_DEBUG_DIFFCRED: 1726 case PRIV_DEBUG_SUGID: 1727 case PRIV_DEBUG_UNPRIV: 1728 1729 /* 1730 * Allow manipulating jails. 1731 */ 1732 case PRIV_JAIL_ATTACH: 1733 1734 /* 1735 * Allow privilege with respect to the Partition policy, but not the 1736 * Privs policy. 1737 */ 1738 case PRIV_MAC_PARTITION: 1739 1740 /* 1741 * Allow privilege with respect to process resource limits and login 1742 * context. 1743 */ 1744 case PRIV_PROC_LIMIT: 1745 case PRIV_PROC_SETLOGIN: 1746 case PRIV_PROC_SETRLIMIT: 1747 1748 /* 1749 * Allow System V and POSIX IPC privileges. 1750 */ 1751 case PRIV_IPC_READ: 1752 case PRIV_IPC_WRITE: 1753 case PRIV_IPC_ADMIN: 1754 case PRIV_IPC_MSGSIZE: 1755 case PRIV_MQ_ADMIN: 1756 1757 /* 1758 * Allow certain scheduler manipulations -- possibly this should be 1759 * controlled by more fine-grained policy, as potentially low 1760 * integrity processes can deny CPU to higher integrity ones. 1761 */ 1762 case PRIV_SCHED_DIFFCRED: 1763 case PRIV_SCHED_SETPRIORITY: 1764 case PRIV_SCHED_RTPRIO: 1765 case PRIV_SCHED_SETPOLICY: 1766 case PRIV_SCHED_SET: 1767 case PRIV_SCHED_SETPARAM: 1768 1769 /* 1770 * More IPC privileges. 1771 */ 1772 case PRIV_SEM_WRITE: 1773 1774 /* 1775 * Allow signaling privileges subject to integrity policy. 1776 */ 1777 case PRIV_SIGNAL_DIFFCRED: 1778 case PRIV_SIGNAL_SUGID: 1779 1780 /* 1781 * Allow access to only limited sysctls from lower integrity levels; 1782 * piggy-back on the Jail definition. 1783 */ 1784 case PRIV_SYSCTL_WRITEJAIL: 1785 1786 /* 1787 * Allow TTY-based privileges, subject to general device access using 1788 * labels on TTY device nodes, but not console privilege. 1789 */ 1790 case PRIV_TTY_DRAINWAIT: 1791 case PRIV_TTY_DTRWAIT: 1792 case PRIV_TTY_EXCLUSIVE: 1793 case PRIV_TTY_STI: 1794 case PRIV_TTY_SETA: 1795 1796 /* 1797 * Grant most VFS privileges, as almost all are in practice bounded 1798 * by more specific checks using labels. 1799 */ 1800 case PRIV_VFS_READ: 1801 case PRIV_VFS_WRITE: 1802 case PRIV_VFS_ADMIN: 1803 case PRIV_VFS_EXEC: 1804 case PRIV_VFS_LOOKUP: 1805 case PRIV_VFS_CHFLAGS_DEV: 1806 case PRIV_VFS_CHOWN: 1807 case PRIV_VFS_CHROOT: 1808 case PRIV_VFS_RETAINSUGID: 1809 case PRIV_VFS_EXCEEDQUOTA: 1810 case PRIV_VFS_FCHROOT: 1811 case PRIV_VFS_FHOPEN: 1812 case PRIV_VFS_FHSTATFS: 1813 case PRIV_VFS_GENERATION: 1814 case PRIV_VFS_GETFH: 1815 case PRIV_VFS_GETQUOTA: 1816 case PRIV_VFS_LINK: 1817 case PRIV_VFS_MOUNT: 1818 case PRIV_VFS_MOUNT_OWNER: 1819 case PRIV_VFS_MOUNT_PERM: 1820 case PRIV_VFS_MOUNT_SUIDDIR: 1821 case PRIV_VFS_MOUNT_NONUSER: 1822 case PRIV_VFS_SETGID: 1823 case PRIV_VFS_STICKYFILE: 1824 case PRIV_VFS_SYSFLAGS: 1825 case PRIV_VFS_UNMOUNT: 1826 1827 /* 1828 * Allow VM privileges; it would be nice if these were subject to 1829 * resource limits. 1830 */ 1831 case PRIV_VM_MADV_PROTECT: 1832 case PRIV_VM_MLOCK: 1833 case PRIV_VM_MUNLOCK: 1834 case PRIV_VM_SWAP_NOQUOTA: 1835 case PRIV_VM_SWAP_NORLIMIT: 1836 1837 /* 1838 * Allow some but not all network privileges. In general, dont allow 1839 * reconfiguring the network stack, just normal use. 1840 */ 1841 case PRIV_NETATALK_RESERVEDPORT: 1842 case PRIV_NETINET_RESERVEDPORT: 1843 case PRIV_NETINET_RAW: 1844 case PRIV_NETINET_REUSEPORT: 1845 case PRIV_NETIPX_RESERVEDPORT: 1846 case PRIV_NETIPX_RAW: 1847 break; 1848 1849 /* 1850 * All remaining system privileges are allow only if the process 1851 * holds privilege with respect to the Biba policy. 1852 */ 1853 default: 1854 subj = SLOT(cred->cr_label); 1855 error = biba_subject_privileged(subj); 1856 if (error) 1857 return (error); 1858 } 1859 return (0); 1860 } 1861 1862 static int 1863 biba_proc_check_debug(struct ucred *cred, struct proc *p) 1864 { 1865 struct mac_biba *subj, *obj; 1866 1867 if (!biba_enabled) 1868 return (0); 1869 1870 subj = SLOT(cred->cr_label); 1871 obj = SLOT(p->p_ucred->cr_label); 1872 1873 /* XXX: range checks */ 1874 if (!biba_dominate_effective(obj, subj)) 1875 return (ESRCH); 1876 if (!biba_dominate_effective(subj, obj)) 1877 return (EACCES); 1878 1879 return (0); 1880 } 1881 1882 static int 1883 biba_proc_check_sched(struct ucred *cred, struct proc *p) 1884 { 1885 struct mac_biba *subj, *obj; 1886 1887 if (!biba_enabled) 1888 return (0); 1889 1890 subj = SLOT(cred->cr_label); 1891 obj = SLOT(p->p_ucred->cr_label); 1892 1893 /* XXX: range checks */ 1894 if (!biba_dominate_effective(obj, subj)) 1895 return (ESRCH); 1896 if (!biba_dominate_effective(subj, obj)) 1897 return (EACCES); 1898 1899 return (0); 1900 } 1901 1902 static int 1903 biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1904 { 1905 struct mac_biba *subj, *obj; 1906 1907 if (!biba_enabled) 1908 return (0); 1909 1910 subj = SLOT(cred->cr_label); 1911 obj = SLOT(p->p_ucred->cr_label); 1912 1913 /* XXX: range checks */ 1914 if (!biba_dominate_effective(obj, subj)) 1915 return (ESRCH); 1916 if (!biba_dominate_effective(subj, obj)) 1917 return (EACCES); 1918 1919 return (0); 1920 } 1921 1922 static int 1923 biba_socket_check_deliver(struct socket *so, struct label *solabel, 1924 struct mbuf *m, struct label *mlabel) 1925 { 1926 struct mac_biba *p, *s; 1927 int error; 1928 1929 if (!biba_enabled) 1930 return (0); 1931 1932 p = SLOT(mlabel); 1933 s = SLOT(solabel); 1934 1935 SOCK_LOCK(so); 1936 error = biba_equal_effective(p, s) ? 0 : EACCES; 1937 SOCK_UNLOCK(so); 1938 return (error); 1939 } 1940 1941 static int 1942 biba_socket_check_relabel(struct ucred *cred, struct socket *so, 1943 struct label *solabel, struct label *newlabel) 1944 { 1945 struct mac_biba *subj, *obj, *new; 1946 int error; 1947 1948 SOCK_LOCK_ASSERT(so); 1949 1950 new = SLOT(newlabel); 1951 subj = SLOT(cred->cr_label); 1952 obj = SLOT(solabel); 1953 1954 /* 1955 * If there is a Biba label update for the socket, it may be an 1956 * update of effective. 1957 */ 1958 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1959 if (error) 1960 return (error); 1961 1962 /* 1963 * To relabel a socket, the old socket effective must be in the 1964 * subject range. 1965 */ 1966 if (!biba_effective_in_range(obj, subj)) 1967 return (EPERM); 1968 1969 /* 1970 * If the Biba label is to be changed, authorize as appropriate. 1971 */ 1972 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1973 /* 1974 * To relabel a socket, the new socket effective must be in 1975 * the subject range. 1976 */ 1977 if (!biba_effective_in_range(new, subj)) 1978 return (EPERM); 1979 1980 /* 1981 * To change the Biba label on the socket to contain EQUAL, 1982 * the subject must have appropriate privilege. 1983 */ 1984 if (biba_contains_equal(new)) { 1985 error = biba_subject_privileged(subj); 1986 if (error) 1987 return (error); 1988 } 1989 } 1990 1991 return (0); 1992 } 1993 1994 static int 1995 biba_socket_check_visible(struct ucred *cred, struct socket *so, 1996 struct label *solabel) 1997 { 1998 struct mac_biba *subj, *obj; 1999 2000 if (!biba_enabled) 2001 return (0); 2002 2003 subj = SLOT(cred->cr_label); 2004 obj = SLOT(solabel); 2005 2006 SOCK_LOCK(so); 2007 if (!biba_dominate_effective(obj, subj)) { 2008 SOCK_UNLOCK(so); 2009 return (ENOENT); 2010 } 2011 SOCK_UNLOCK(so); 2012 2013 return (0); 2014 } 2015 2016 static void 2017 biba_socket_create(struct ucred *cred, struct socket *so, 2018 struct label *solabel) 2019 { 2020 struct mac_biba *source, *dest; 2021 2022 source = SLOT(cred->cr_label); 2023 dest = SLOT(solabel); 2024 2025 biba_copy_effective(source, dest); 2026 } 2027 2028 static void 2029 biba_socket_create_mbuf(struct socket *so, struct label *solabel, 2030 struct mbuf *m, struct label *mlabel) 2031 { 2032 struct mac_biba *source, *dest; 2033 2034 source = SLOT(solabel); 2035 dest = SLOT(mlabel); 2036 2037 SOCK_LOCK(so); 2038 biba_copy_effective(source, dest); 2039 SOCK_UNLOCK(so); 2040 } 2041 2042 static void 2043 biba_socket_newconn(struct socket *oldso, struct label *oldsolabel, 2044 struct socket *newso, struct label *newsolabel) 2045 { 2046 struct mac_biba source, *dest; 2047 2048 SOCK_LOCK(oldso); 2049 source = *SLOT(oldsolabel); 2050 SOCK_UNLOCK(oldso); 2051 2052 dest = SLOT(newsolabel); 2053 2054 SOCK_LOCK(newso); 2055 biba_copy_effective(&source, dest); 2056 SOCK_UNLOCK(newso); 2057 } 2058 2059 static void 2060 biba_socket_relabel(struct ucred *cred, struct socket *so, 2061 struct label *solabel, struct label *newlabel) 2062 { 2063 struct mac_biba *source, *dest; 2064 2065 SOCK_LOCK_ASSERT(so); 2066 2067 source = SLOT(newlabel); 2068 dest = SLOT(solabel); 2069 2070 biba_copy(source, dest); 2071 } 2072 2073 static void 2074 biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 2075 struct socket *so, struct label *sopeerlabel) 2076 { 2077 struct mac_biba *source, *dest; 2078 2079 source = SLOT(mlabel); 2080 dest = SLOT(sopeerlabel); 2081 2082 SOCK_LOCK(so); 2083 biba_copy_effective(source, dest); 2084 SOCK_UNLOCK(so); 2085 } 2086 2087 static void 2088 biba_socketpeer_set_from_socket(struct socket *oldso, 2089 struct label *oldsolabel, struct socket *newso, 2090 struct label *newsopeerlabel) 2091 { 2092 struct mac_biba source, *dest; 2093 2094 SOCK_LOCK(oldso); 2095 source = *SLOT(oldsolabel); 2096 SOCK_UNLOCK(oldso); 2097 dest = SLOT(newsopeerlabel); 2098 2099 SOCK_LOCK(newso); 2100 biba_copy_effective(&source, dest); 2101 SOCK_UNLOCK(newso); 2102 } 2103 2104 static void 2105 biba_syncache_create(struct label *label, struct inpcb *inp) 2106 { 2107 struct mac_biba *source, *dest; 2108 2109 source = SLOT(inp->inp_label); 2110 dest = SLOT(label); 2111 biba_copy_effective(source, dest); 2112 } 2113 2114 static void 2115 biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2116 struct label *mlabel) 2117 { 2118 struct mac_biba *source, *dest; 2119 2120 source = SLOT(sc_label); 2121 dest = SLOT(mlabel); 2122 biba_copy_effective(source, dest); 2123 } 2124 2125 static int 2126 biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2127 struct label *vplabel) 2128 { 2129 struct mac_biba *subj, *obj; 2130 int error; 2131 2132 if (!biba_enabled) 2133 return (0); 2134 2135 subj = SLOT(cred->cr_label); 2136 2137 error = biba_subject_privileged(subj); 2138 if (error) 2139 return (error); 2140 2141 if (vplabel == NULL) 2142 return (0); 2143 2144 obj = SLOT(vplabel); 2145 if (!biba_high_effective(obj)) 2146 return (EACCES); 2147 2148 return (0); 2149 } 2150 2151 static int 2152 biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2153 struct label *vplabel) 2154 { 2155 struct mac_biba *subj, *obj; 2156 int error; 2157 2158 if (!biba_enabled) 2159 return (0); 2160 2161 subj = SLOT(cred->cr_label); 2162 2163 error = biba_subject_privileged(subj); 2164 if (error) 2165 return (error); 2166 2167 if (vplabel == NULL) 2168 return (0); 2169 2170 obj = SLOT(vplabel); 2171 if (!biba_high_effective(obj)) 2172 return (EACCES); 2173 2174 return (0); 2175 } 2176 2177 static int 2178 biba_system_check_auditon(struct ucred *cred, int cmd) 2179 { 2180 struct mac_biba *subj; 2181 int error; 2182 2183 if (!biba_enabled) 2184 return (0); 2185 2186 subj = SLOT(cred->cr_label); 2187 2188 error = biba_subject_privileged(subj); 2189 if (error) 2190 return (error); 2191 2192 return (0); 2193 } 2194 2195 static int 2196 biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2197 struct label *label) 2198 { 2199 struct mac_biba *subj; 2200 int error; 2201 2202 if (!biba_enabled) 2203 return (0); 2204 2205 subj = SLOT(cred->cr_label); 2206 2207 error = biba_subject_privileged(subj); 2208 if (error) 2209 return (error); 2210 2211 return (0); 2212 } 2213 2214 static int 2215 biba_system_check_swapon(struct ucred *cred, struct vnode *vp, 2216 struct label *vplabel) 2217 { 2218 struct mac_biba *subj, *obj; 2219 int error; 2220 2221 if (!biba_enabled) 2222 return (0); 2223 2224 subj = SLOT(cred->cr_label); 2225 obj = SLOT(vplabel); 2226 2227 error = biba_subject_privileged(subj); 2228 if (error) 2229 return (error); 2230 2231 if (!biba_high_effective(obj)) 2232 return (EACCES); 2233 2234 return (0); 2235 } 2236 2237 static int 2238 biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2239 void *arg1, int arg2, struct sysctl_req *req) 2240 { 2241 struct mac_biba *subj; 2242 int error; 2243 2244 if (!biba_enabled) 2245 return (0); 2246 2247 subj = SLOT(cred->cr_label); 2248 2249 /* 2250 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2251 * but also require privilege to change them. 2252 */ 2253 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2254 if (!biba_subject_dominate_high(subj)) 2255 return (EACCES); 2256 2257 error = biba_subject_privileged(subj); 2258 if (error) 2259 return (error); 2260 } 2261 2262 return (0); 2263 } 2264 2265 static void 2266 biba_sysvmsg_cleanup(struct label *msglabel) 2267 { 2268 2269 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 2270 } 2271 2272 static void 2273 biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2274 struct label *msqlabel, struct msg *msgptr, struct label *msglabel) 2275 { 2276 struct mac_biba *source, *dest; 2277 2278 /* Ignore the msgq label */ 2279 source = SLOT(cred->cr_label); 2280 dest = SLOT(msglabel); 2281 2282 biba_copy_effective(source, dest); 2283 } 2284 2285 static int 2286 biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 2287 struct label *msglabel) 2288 { 2289 struct mac_biba *subj, *obj; 2290 2291 if (!biba_enabled) 2292 return (0); 2293 2294 subj = SLOT(cred->cr_label); 2295 obj = SLOT(msglabel); 2296 2297 if (!biba_dominate_effective(obj, subj)) 2298 return (EACCES); 2299 2300 return (0); 2301 } 2302 2303 static int 2304 biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 2305 struct label *msglabel) 2306 { 2307 struct mac_biba *subj, *obj; 2308 2309 if (!biba_enabled) 2310 return (0); 2311 2312 subj = SLOT(cred->cr_label); 2313 obj = SLOT(msglabel); 2314 2315 if (!biba_dominate_effective(subj, obj)) 2316 return (EACCES); 2317 2318 return (0); 2319 } 2320 2321 static int 2322 biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 2323 struct label *msqklabel) 2324 { 2325 struct mac_biba *subj, *obj; 2326 2327 if (!biba_enabled) 2328 return (0); 2329 2330 subj = SLOT(cred->cr_label); 2331 obj = SLOT(msqklabel); 2332 2333 if (!biba_dominate_effective(obj, subj)) 2334 return (EACCES); 2335 2336 return (0); 2337 } 2338 2339 static int 2340 biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 2341 struct label *msqklabel) 2342 { 2343 struct mac_biba *subj, *obj; 2344 2345 if (!biba_enabled) 2346 return (0); 2347 2348 subj = SLOT(cred->cr_label); 2349 obj = SLOT(msqklabel); 2350 2351 if (!biba_dominate_effective(subj, obj)) 2352 return (EACCES); 2353 2354 return (0); 2355 } 2356 2357 static int 2358 biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 2359 struct label *msqklabel) 2360 { 2361 struct mac_biba *subj, *obj; 2362 2363 if (!biba_enabled) 2364 return (0); 2365 2366 subj = SLOT(cred->cr_label); 2367 obj = SLOT(msqklabel); 2368 2369 if (!biba_dominate_effective(obj, subj)) 2370 return (EACCES); 2371 2372 return (0); 2373 } 2374 2375 static int 2376 biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 2377 struct label *msqklabel, int cmd) 2378 { 2379 struct mac_biba *subj, *obj; 2380 2381 if (!biba_enabled) 2382 return (0); 2383 2384 subj = SLOT(cred->cr_label); 2385 obj = SLOT(msqklabel); 2386 2387 switch(cmd) { 2388 case IPC_RMID: 2389 case IPC_SET: 2390 if (!biba_dominate_effective(subj, obj)) 2391 return (EACCES); 2392 break; 2393 2394 case IPC_STAT: 2395 if (!biba_dominate_effective(obj, subj)) 2396 return (EACCES); 2397 break; 2398 2399 default: 2400 return (EACCES); 2401 } 2402 2403 return (0); 2404 } 2405 2406 static void 2407 biba_sysvmsq_cleanup(struct label *msqlabel) 2408 { 2409 2410 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 2411 } 2412 2413 static void 2414 biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2415 struct label *msqlabel) 2416 { 2417 struct mac_biba *source, *dest; 2418 2419 source = SLOT(cred->cr_label); 2420 dest = SLOT(msqlabel); 2421 2422 biba_copy_effective(source, dest); 2423 } 2424 2425 static int 2426 biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 2427 struct label *semaklabel, int cmd) 2428 { 2429 struct mac_biba *subj, *obj; 2430 2431 if (!biba_enabled) 2432 return (0); 2433 2434 subj = SLOT(cred->cr_label); 2435 obj = SLOT(semaklabel); 2436 2437 switch(cmd) { 2438 case IPC_RMID: 2439 case IPC_SET: 2440 case SETVAL: 2441 case SETALL: 2442 if (!biba_dominate_effective(subj, obj)) 2443 return (EACCES); 2444 break; 2445 2446 case IPC_STAT: 2447 case GETVAL: 2448 case GETPID: 2449 case GETNCNT: 2450 case GETZCNT: 2451 case GETALL: 2452 if (!biba_dominate_effective(obj, subj)) 2453 return (EACCES); 2454 break; 2455 2456 default: 2457 return (EACCES); 2458 } 2459 2460 return (0); 2461 } 2462 2463 static int 2464 biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 2465 struct label *semaklabel) 2466 { 2467 struct mac_biba *subj, *obj; 2468 2469 if (!biba_enabled) 2470 return (0); 2471 2472 subj = SLOT(cred->cr_label); 2473 obj = SLOT(semaklabel); 2474 2475 if (!biba_dominate_effective(obj, subj)) 2476 return (EACCES); 2477 2478 return (0); 2479 } 2480 2481 static int 2482 biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 2483 struct label *semaklabel, size_t accesstype) 2484 { 2485 struct mac_biba *subj, *obj; 2486 2487 if (!biba_enabled) 2488 return (0); 2489 2490 subj = SLOT(cred->cr_label); 2491 obj = SLOT(semaklabel); 2492 2493 if (accesstype & SEM_R) 2494 if (!biba_dominate_effective(obj, subj)) 2495 return (EACCES); 2496 2497 if (accesstype & SEM_A) 2498 if (!biba_dominate_effective(subj, obj)) 2499 return (EACCES); 2500 2501 return (0); 2502 } 2503 2504 static void 2505 biba_sysvsem_cleanup(struct label *semalabel) 2506 { 2507 2508 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 2509 } 2510 2511 static void 2512 biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr, 2513 struct label *semalabel) 2514 { 2515 struct mac_biba *source, *dest; 2516 2517 source = SLOT(cred->cr_label); 2518 dest = SLOT(semalabel); 2519 2520 biba_copy_effective(source, dest); 2521 } 2522 2523 static int 2524 biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 2525 struct label *shmseglabel, int shmflg) 2526 { 2527 struct mac_biba *subj, *obj; 2528 2529 if (!biba_enabled) 2530 return (0); 2531 2532 subj = SLOT(cred->cr_label); 2533 obj = SLOT(shmseglabel); 2534 2535 if (!biba_dominate_effective(obj, subj)) 2536 return (EACCES); 2537 if ((shmflg & SHM_RDONLY) == 0) { 2538 if (!biba_dominate_effective(subj, obj)) 2539 return (EACCES); 2540 } 2541 2542 return (0); 2543 } 2544 2545 static int 2546 biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 2547 struct label *shmseglabel, int cmd) 2548 { 2549 struct mac_biba *subj, *obj; 2550 2551 if (!biba_enabled) 2552 return (0); 2553 2554 subj = SLOT(cred->cr_label); 2555 obj = SLOT(shmseglabel); 2556 2557 switch(cmd) { 2558 case IPC_RMID: 2559 case IPC_SET: 2560 if (!biba_dominate_effective(subj, obj)) 2561 return (EACCES); 2562 break; 2563 2564 case IPC_STAT: 2565 case SHM_STAT: 2566 if (!biba_dominate_effective(obj, subj)) 2567 return (EACCES); 2568 break; 2569 2570 default: 2571 return (EACCES); 2572 } 2573 2574 return (0); 2575 } 2576 2577 static int 2578 biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 2579 struct label *shmseglabel, int shmflg) 2580 { 2581 struct mac_biba *subj, *obj; 2582 2583 if (!biba_enabled) 2584 return (0); 2585 2586 subj = SLOT(cred->cr_label); 2587 obj = SLOT(shmseglabel); 2588 2589 if (!biba_dominate_effective(obj, subj)) 2590 return (EACCES); 2591 2592 return (0); 2593 } 2594 2595 static void 2596 biba_sysvshm_cleanup(struct label *shmlabel) 2597 { 2598 2599 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 2600 } 2601 2602 static void 2603 biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr, 2604 struct label *shmlabel) 2605 { 2606 struct mac_biba *source, *dest; 2607 2608 source = SLOT(cred->cr_label); 2609 dest = SLOT(shmlabel); 2610 2611 biba_copy_effective(source, dest); 2612 } 2613 2614 static int 2615 biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2616 struct vnode *vp, struct label *vplabel) 2617 { 2618 struct mac_biba mb_temp, *source, *dest; 2619 int buflen, error; 2620 2621 source = SLOT(mplabel); 2622 dest = SLOT(vplabel); 2623 2624 buflen = sizeof(mb_temp); 2625 bzero(&mb_temp, buflen); 2626 2627 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 2628 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread); 2629 if (error == ENOATTR || error == EOPNOTSUPP) { 2630 /* Fall back to the mntlabel. */ 2631 biba_copy_effective(source, dest); 2632 return (0); 2633 } else if (error) 2634 return (error); 2635 2636 if (buflen != sizeof(mb_temp)) { 2637 printf("biba_vnode_associate_extattr: bad size %d\n", 2638 buflen); 2639 return (EPERM); 2640 } 2641 if (biba_valid(&mb_temp) != 0) { 2642 printf("biba_vnode_associate_extattr: invalid\n"); 2643 return (EPERM); 2644 } 2645 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != 2646 MAC_BIBA_FLAG_EFFECTIVE) { 2647 printf("biba_vnode_associate_extattr: not effective\n"); 2648 return (EPERM); 2649 } 2650 2651 biba_copy_effective(&mb_temp, dest); 2652 return (0); 2653 } 2654 2655 static void 2656 biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2657 struct vnode *vp, struct label *vplabel) 2658 { 2659 struct mac_biba *source, *dest; 2660 2661 source = SLOT(mplabel); 2662 dest = SLOT(vplabel); 2663 2664 biba_copy_effective(source, dest); 2665 } 2666 2667 static int 2668 biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2669 struct label *dvplabel) 2670 { 2671 struct mac_biba *subj, *obj; 2672 2673 if (!biba_enabled) 2674 return (0); 2675 2676 subj = SLOT(cred->cr_label); 2677 obj = SLOT(dvplabel); 2678 2679 if (!biba_dominate_effective(obj, subj)) 2680 return (EACCES); 2681 2682 return (0); 2683 } 2684 2685 static int 2686 biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2687 struct label *dvplabel) 2688 { 2689 struct mac_biba *subj, *obj; 2690 2691 if (!biba_enabled) 2692 return (0); 2693 2694 subj = SLOT(cred->cr_label); 2695 obj = SLOT(dvplabel); 2696 2697 if (!biba_dominate_effective(obj, subj)) 2698 return (EACCES); 2699 2700 return (0); 2701 } 2702 2703 static int 2704 biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2705 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2706 { 2707 struct mac_biba *subj, *obj; 2708 2709 if (!biba_enabled) 2710 return (0); 2711 2712 subj = SLOT(cred->cr_label); 2713 obj = SLOT(dvplabel); 2714 2715 if (!biba_dominate_effective(subj, obj)) 2716 return (EACCES); 2717 2718 return (0); 2719 } 2720 2721 static int 2722 biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2723 struct label *vplabel, acl_type_t type) 2724 { 2725 struct mac_biba *subj, *obj; 2726 2727 if (!biba_enabled) 2728 return (0); 2729 2730 subj = SLOT(cred->cr_label); 2731 obj = SLOT(vplabel); 2732 2733 if (!biba_dominate_effective(subj, obj)) 2734 return (EACCES); 2735 2736 return (0); 2737 } 2738 2739 static int 2740 biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2741 struct label *vplabel, int attrnamespace, const char *name) 2742 { 2743 struct mac_biba *subj, *obj; 2744 2745 if (!biba_enabled) 2746 return (0); 2747 2748 subj = SLOT(cred->cr_label); 2749 obj = SLOT(vplabel); 2750 2751 if (!biba_dominate_effective(subj, obj)) 2752 return (EACCES); 2753 2754 return (0); 2755 } 2756 2757 static int 2758 biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2759 struct label *vplabel, struct image_params *imgp, 2760 struct label *execlabel) 2761 { 2762 struct mac_biba *subj, *obj, *exec; 2763 int error; 2764 2765 if (execlabel != NULL) { 2766 /* 2767 * We currently don't permit labels to be changed at 2768 * exec-time as part of Biba, so disallow non-NULL Biba label 2769 * elements in the execlabel. 2770 */ 2771 exec = SLOT(execlabel); 2772 error = biba_atmostflags(exec, 0); 2773 if (error) 2774 return (error); 2775 } 2776 2777 if (!biba_enabled) 2778 return (0); 2779 2780 subj = SLOT(cred->cr_label); 2781 obj = SLOT(vplabel); 2782 2783 if (!biba_dominate_effective(obj, subj)) 2784 return (EACCES); 2785 2786 return (0); 2787 } 2788 2789 static int 2790 biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2791 struct label *vplabel, acl_type_t type) 2792 { 2793 struct mac_biba *subj, *obj; 2794 2795 if (!biba_enabled) 2796 return (0); 2797 2798 subj = SLOT(cred->cr_label); 2799 obj = SLOT(vplabel); 2800 2801 if (!biba_dominate_effective(obj, subj)) 2802 return (EACCES); 2803 2804 return (0); 2805 } 2806 2807 static int 2808 biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2809 struct label *vplabel, int attrnamespace, const char *name) 2810 { 2811 struct mac_biba *subj, *obj; 2812 2813 if (!biba_enabled) 2814 return (0); 2815 2816 subj = SLOT(cred->cr_label); 2817 obj = SLOT(vplabel); 2818 2819 if (!biba_dominate_effective(obj, subj)) 2820 return (EACCES); 2821 2822 return (0); 2823 } 2824 2825 static int 2826 biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2827 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2828 struct componentname *cnp) 2829 { 2830 struct mac_biba *subj, *obj; 2831 2832 if (!biba_enabled) 2833 return (0); 2834 2835 subj = SLOT(cred->cr_label); 2836 obj = SLOT(dvplabel); 2837 2838 if (!biba_dominate_effective(subj, obj)) 2839 return (EACCES); 2840 2841 obj = SLOT(vplabel); 2842 2843 if (!biba_dominate_effective(subj, obj)) 2844 return (EACCES); 2845 2846 return (0); 2847 } 2848 2849 static int 2850 biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2851 struct label *vplabel, int attrnamespace) 2852 { 2853 struct mac_biba *subj, *obj; 2854 2855 if (!biba_enabled) 2856 return (0); 2857 2858 subj = SLOT(cred->cr_label); 2859 obj = SLOT(vplabel); 2860 2861 if (!biba_dominate_effective(obj, subj)) 2862 return (EACCES); 2863 2864 return (0); 2865 } 2866 2867 static int 2868 biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2869 struct label *dvplabel, struct componentname *cnp) 2870 { 2871 struct mac_biba *subj, *obj; 2872 2873 if (!biba_enabled) 2874 return (0); 2875 2876 subj = SLOT(cred->cr_label); 2877 obj = SLOT(dvplabel); 2878 2879 if (!biba_dominate_effective(obj, subj)) 2880 return (EACCES); 2881 2882 return (0); 2883 } 2884 2885 static int 2886 biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2887 struct label *vplabel, int prot, int flags) 2888 { 2889 struct mac_biba *subj, *obj; 2890 2891 /* 2892 * Rely on the use of open()-time protections to handle 2893 * non-revocation cases. 2894 */ 2895 if (!biba_enabled || !revocation_enabled) 2896 return (0); 2897 2898 subj = SLOT(cred->cr_label); 2899 obj = SLOT(vplabel); 2900 2901 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2902 if (!biba_dominate_effective(obj, subj)) 2903 return (EACCES); 2904 } 2905 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2906 if (!biba_dominate_effective(subj, obj)) 2907 return (EACCES); 2908 } 2909 2910 return (0); 2911 } 2912 2913 static int 2914 biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2915 struct label *vplabel, accmode_t accmode) 2916 { 2917 struct mac_biba *subj, *obj; 2918 2919 if (!biba_enabled) 2920 return (0); 2921 2922 subj = SLOT(cred->cr_label); 2923 obj = SLOT(vplabel); 2924 2925 /* XXX privilege override for admin? */ 2926 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) { 2927 if (!biba_dominate_effective(obj, subj)) 2928 return (EACCES); 2929 } 2930 if (accmode & VMODIFY_PERMS) { 2931 if (!biba_dominate_effective(subj, obj)) 2932 return (EACCES); 2933 } 2934 2935 return (0); 2936 } 2937 2938 static int 2939 biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2940 struct vnode *vp, struct label *vplabel) 2941 { 2942 struct mac_biba *subj, *obj; 2943 2944 if (!biba_enabled || !revocation_enabled) 2945 return (0); 2946 2947 subj = SLOT(active_cred->cr_label); 2948 obj = SLOT(vplabel); 2949 2950 if (!biba_dominate_effective(obj, subj)) 2951 return (EACCES); 2952 2953 return (0); 2954 } 2955 2956 static int 2957 biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2958 struct vnode *vp, struct label *vplabel) 2959 { 2960 struct mac_biba *subj, *obj; 2961 2962 if (!biba_enabled || !revocation_enabled) 2963 return (0); 2964 2965 subj = SLOT(active_cred->cr_label); 2966 obj = SLOT(vplabel); 2967 2968 if (!biba_dominate_effective(obj, subj)) 2969 return (EACCES); 2970 2971 return (0); 2972 } 2973 2974 static int 2975 biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2976 struct label *dvplabel) 2977 { 2978 struct mac_biba *subj, *obj; 2979 2980 if (!biba_enabled) 2981 return (0); 2982 2983 subj = SLOT(cred->cr_label); 2984 obj = SLOT(dvplabel); 2985 2986 if (!biba_dominate_effective(obj, subj)) 2987 return (EACCES); 2988 2989 return (0); 2990 } 2991 2992 static int 2993 biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2994 struct label *vplabel) 2995 { 2996 struct mac_biba *subj, *obj; 2997 2998 if (!biba_enabled) 2999 return (0); 3000 3001 subj = SLOT(cred->cr_label); 3002 obj = SLOT(vplabel); 3003 3004 if (!biba_dominate_effective(obj, subj)) 3005 return (EACCES); 3006 3007 return (0); 3008 } 3009 3010 static int 3011 biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 3012 struct label *vplabel, struct label *newlabel) 3013 { 3014 struct mac_biba *old, *new, *subj; 3015 int error; 3016 3017 old = SLOT(vplabel); 3018 new = SLOT(newlabel); 3019 subj = SLOT(cred->cr_label); 3020 3021 /* 3022 * If there is a Biba label update for the vnode, it must be a 3023 * effective label. 3024 */ 3025 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 3026 if (error) 3027 return (error); 3028 3029 /* 3030 * To perform a relabel of the vnode (Biba label or not), Biba must 3031 * authorize the relabel. 3032 */ 3033 if (!biba_effective_in_range(old, subj)) 3034 return (EPERM); 3035 3036 /* 3037 * If the Biba label is to be changed, authorize as appropriate. 3038 */ 3039 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 3040 /* 3041 * To change the Biba label on a vnode, the new vnode label 3042 * must be in the subject range. 3043 */ 3044 if (!biba_effective_in_range(new, subj)) 3045 return (EPERM); 3046 3047 /* 3048 * To change the Biba label on the vnode to be EQUAL, the 3049 * subject must have appropriate privilege. 3050 */ 3051 if (biba_contains_equal(new)) { 3052 error = biba_subject_privileged(subj); 3053 if (error) 3054 return (error); 3055 } 3056 } 3057 3058 return (0); 3059 } 3060 3061 static int 3062 biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 3063 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3064 struct componentname *cnp) 3065 { 3066 struct mac_biba *subj, *obj; 3067 3068 if (!biba_enabled) 3069 return (0); 3070 3071 subj = SLOT(cred->cr_label); 3072 obj = SLOT(dvplabel); 3073 3074 if (!biba_dominate_effective(subj, obj)) 3075 return (EACCES); 3076 3077 obj = SLOT(vplabel); 3078 3079 if (!biba_dominate_effective(subj, obj)) 3080 return (EACCES); 3081 3082 return (0); 3083 } 3084 3085 static int 3086 biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 3087 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3088 int samedir, struct componentname *cnp) 3089 { 3090 struct mac_biba *subj, *obj; 3091 3092 if (!biba_enabled) 3093 return (0); 3094 3095 subj = SLOT(cred->cr_label); 3096 obj = SLOT(dvplabel); 3097 3098 if (!biba_dominate_effective(subj, obj)) 3099 return (EACCES); 3100 3101 if (vp != NULL) { 3102 obj = SLOT(vplabel); 3103 3104 if (!biba_dominate_effective(subj, obj)) 3105 return (EACCES); 3106 } 3107 3108 return (0); 3109 } 3110 3111 static int 3112 biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3113 struct label *vplabel) 3114 { 3115 struct mac_biba *subj, *obj; 3116 3117 if (!biba_enabled) 3118 return (0); 3119 3120 subj = SLOT(cred->cr_label); 3121 obj = SLOT(vplabel); 3122 3123 if (!biba_dominate_effective(subj, obj)) 3124 return (EACCES); 3125 3126 return (0); 3127 } 3128 3129 static int 3130 biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 3131 struct label *vplabel, acl_type_t type, struct acl *acl) 3132 { 3133 struct mac_biba *subj, *obj; 3134 3135 if (!biba_enabled) 3136 return (0); 3137 3138 subj = SLOT(cred->cr_label); 3139 obj = SLOT(vplabel); 3140 3141 if (!biba_dominate_effective(subj, obj)) 3142 return (EACCES); 3143 3144 return (0); 3145 } 3146 3147 static int 3148 biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3149 struct label *vplabel, int attrnamespace, const char *name) 3150 { 3151 struct mac_biba *subj, *obj; 3152 3153 if (!biba_enabled) 3154 return (0); 3155 3156 subj = SLOT(cred->cr_label); 3157 obj = SLOT(vplabel); 3158 3159 if (!biba_dominate_effective(subj, obj)) 3160 return (EACCES); 3161 3162 /* XXX: protect the MAC EA in a special way? */ 3163 3164 return (0); 3165 } 3166 3167 static int 3168 biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3169 struct label *vplabel, u_long flags) 3170 { 3171 struct mac_biba *subj, *obj; 3172 3173 if (!biba_enabled) 3174 return (0); 3175 3176 subj = SLOT(cred->cr_label); 3177 obj = SLOT(vplabel); 3178 3179 if (!biba_dominate_effective(subj, obj)) 3180 return (EACCES); 3181 3182 return (0); 3183 } 3184 3185 static int 3186 biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3187 struct label *vplabel, mode_t mode) 3188 { 3189 struct mac_biba *subj, *obj; 3190 3191 if (!biba_enabled) 3192 return (0); 3193 3194 subj = SLOT(cred->cr_label); 3195 obj = SLOT(vplabel); 3196 3197 if (!biba_dominate_effective(subj, obj)) 3198 return (EACCES); 3199 3200 return (0); 3201 } 3202 3203 static int 3204 biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3205 struct label *vplabel, uid_t uid, gid_t gid) 3206 { 3207 struct mac_biba *subj, *obj; 3208 3209 if (!biba_enabled) 3210 return (0); 3211 3212 subj = SLOT(cred->cr_label); 3213 obj = SLOT(vplabel); 3214 3215 if (!biba_dominate_effective(subj, obj)) 3216 return (EACCES); 3217 3218 return (0); 3219 } 3220 3221 static int 3222 biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3223 struct label *vplabel, struct timespec atime, struct timespec mtime) 3224 { 3225 struct mac_biba *subj, *obj; 3226 3227 if (!biba_enabled) 3228 return (0); 3229 3230 subj = SLOT(cred->cr_label); 3231 obj = SLOT(vplabel); 3232 3233 if (!biba_dominate_effective(subj, obj)) 3234 return (EACCES); 3235 3236 return (0); 3237 } 3238 3239 static int 3240 biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3241 struct vnode *vp, struct label *vplabel) 3242 { 3243 struct mac_biba *subj, *obj; 3244 3245 if (!biba_enabled) 3246 return (0); 3247 3248 subj = SLOT(active_cred->cr_label); 3249 obj = SLOT(vplabel); 3250 3251 if (!biba_dominate_effective(obj, subj)) 3252 return (EACCES); 3253 3254 return (0); 3255 } 3256 3257 static int 3258 biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3259 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3260 struct componentname *cnp) 3261 { 3262 struct mac_biba *subj, *obj; 3263 3264 if (!biba_enabled) 3265 return (0); 3266 3267 subj = SLOT(cred->cr_label); 3268 obj = SLOT(dvplabel); 3269 3270 if (!biba_dominate_effective(subj, obj)) 3271 return (EACCES); 3272 3273 obj = SLOT(vplabel); 3274 3275 if (!biba_dominate_effective(subj, obj)) 3276 return (EACCES); 3277 3278 return (0); 3279 } 3280 3281 static int 3282 biba_vnode_check_write(struct ucred *active_cred, 3283 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3284 { 3285 struct mac_biba *subj, *obj; 3286 3287 if (!biba_enabled || !revocation_enabled) 3288 return (0); 3289 3290 subj = SLOT(active_cred->cr_label); 3291 obj = SLOT(vplabel); 3292 3293 if (!biba_dominate_effective(subj, obj)) 3294 return (EACCES); 3295 3296 return (0); 3297 } 3298 3299 static int 3300 biba_vnode_create_extattr(struct ucred *cred, struct mount *mp, 3301 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 3302 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 3303 { 3304 struct mac_biba *source, *dest, mb_temp; 3305 size_t buflen; 3306 int error; 3307 3308 buflen = sizeof(mb_temp); 3309 bzero(&mb_temp, buflen); 3310 3311 source = SLOT(cred->cr_label); 3312 dest = SLOT(vplabel); 3313 biba_copy_effective(source, &mb_temp); 3314 3315 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3316 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3317 if (error == 0) 3318 biba_copy_effective(source, dest); 3319 return (error); 3320 } 3321 3322 static void 3323 biba_vnode_relabel(struct ucred *cred, struct vnode *vp, 3324 struct label *vplabel, struct label *newlabel) 3325 { 3326 struct mac_biba *source, *dest; 3327 3328 source = SLOT(newlabel); 3329 dest = SLOT(vplabel); 3330 3331 biba_copy(source, dest); 3332 } 3333 3334 static int 3335 biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 3336 struct label *vplabel, struct label *intlabel) 3337 { 3338 struct mac_biba *source, mb_temp; 3339 size_t buflen; 3340 int error; 3341 3342 buflen = sizeof(mb_temp); 3343 bzero(&mb_temp, buflen); 3344 3345 source = SLOT(intlabel); 3346 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0) 3347 return (0); 3348 3349 biba_copy_effective(source, &mb_temp); 3350 3351 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3352 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3353 return (error); 3354 } 3355 3356 static struct mac_policy_ops mac_biba_ops = 3357 { 3358 .mpo_init = biba_init, 3359 3360 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3361 .mpo_bpfdesc_create = biba_bpfdesc_create, 3362 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, 3363 .mpo_bpfdesc_destroy_label = biba_destroy_label, 3364 .mpo_bpfdesc_init_label = biba_init_label, 3365 3366 .mpo_cred_associate_nfsd = biba_cred_associate_nfsd, 3367 .mpo_cred_check_relabel = biba_cred_check_relabel, 3368 .mpo_cred_check_visible = biba_cred_check_visible, 3369 .mpo_cred_copy_label = biba_copy_label, 3370 .mpo_cred_create_init = biba_cred_create_init, 3371 .mpo_cred_create_swapper = biba_cred_create_swapper, 3372 .mpo_cred_destroy_label = biba_destroy_label, 3373 .mpo_cred_externalize_label = biba_externalize_label, 3374 .mpo_cred_init_label = biba_init_label, 3375 .mpo_cred_internalize_label = biba_internalize_label, 3376 .mpo_cred_relabel = biba_cred_relabel, 3377 3378 .mpo_devfs_create_device = biba_devfs_create_device, 3379 .mpo_devfs_create_directory = biba_devfs_create_directory, 3380 .mpo_devfs_create_symlink = biba_devfs_create_symlink, 3381 .mpo_devfs_destroy_label = biba_destroy_label, 3382 .mpo_devfs_init_label = biba_init_label, 3383 .mpo_devfs_update = biba_devfs_update, 3384 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, 3385 3386 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3387 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3388 .mpo_ifnet_copy_label = biba_copy_label, 3389 .mpo_ifnet_create = biba_ifnet_create, 3390 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, 3391 .mpo_ifnet_destroy_label = biba_destroy_label, 3392 .mpo_ifnet_externalize_label = biba_externalize_label, 3393 .mpo_ifnet_init_label = biba_init_label, 3394 .mpo_ifnet_internalize_label = biba_internalize_label, 3395 .mpo_ifnet_relabel = biba_ifnet_relabel, 3396 3397 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3398 .mpo_inpcb_check_visible = biba_inpcb_check_visible, 3399 .mpo_inpcb_create = biba_inpcb_create, 3400 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, 3401 .mpo_inpcb_destroy_label = biba_destroy_label, 3402 .mpo_inpcb_init_label = biba_init_label_waitcheck, 3403 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, 3404 3405 .mpo_ip6q_create = biba_ip6q_create, 3406 .mpo_ip6q_destroy_label = biba_destroy_label, 3407 .mpo_ip6q_init_label = biba_init_label_waitcheck, 3408 .mpo_ip6q_match = biba_ip6q_match, 3409 .mpo_ip6q_reassemble = biba_ip6q_reassemble, 3410 .mpo_ip6q_update = biba_ip6q_update, 3411 3412 .mpo_ipq_create = biba_ipq_create, 3413 .mpo_ipq_destroy_label = biba_destroy_label, 3414 .mpo_ipq_init_label = biba_init_label_waitcheck, 3415 .mpo_ipq_match = biba_ipq_match, 3416 .mpo_ipq_reassemble = biba_ipq_reassemble, 3417 .mpo_ipq_update = biba_ipq_update, 3418 3419 .mpo_kld_check_load = biba_kld_check_load, 3420 3421 .mpo_mbuf_copy_label = biba_copy_label, 3422 .mpo_mbuf_destroy_label = biba_destroy_label, 3423 .mpo_mbuf_init_label = biba_init_label_waitcheck, 3424 3425 .mpo_mount_check_stat = biba_mount_check_stat, 3426 .mpo_mount_create = biba_mount_create, 3427 .mpo_mount_destroy_label = biba_destroy_label, 3428 .mpo_mount_init_label = biba_init_label, 3429 3430 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send, 3431 3432 .mpo_netinet_arp_send = biba_netinet_arp_send, 3433 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply, 3434 .mpo_netinet_firewall_send = biba_netinet_firewall_send, 3435 .mpo_netinet_fragment = biba_netinet_fragment, 3436 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply, 3437 .mpo_netinet_igmp_send = biba_netinet_igmp_send, 3438 3439 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send, 3440 3441 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3442 .mpo_pipe_check_poll = biba_pipe_check_poll, 3443 .mpo_pipe_check_read = biba_pipe_check_read, 3444 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3445 .mpo_pipe_check_stat = biba_pipe_check_stat, 3446 .mpo_pipe_check_write = biba_pipe_check_write, 3447 .mpo_pipe_copy_label = biba_copy_label, 3448 .mpo_pipe_create = biba_pipe_create, 3449 .mpo_pipe_destroy_label = biba_destroy_label, 3450 .mpo_pipe_externalize_label = biba_externalize_label, 3451 .mpo_pipe_init_label = biba_init_label, 3452 .mpo_pipe_internalize_label = biba_internalize_label, 3453 .mpo_pipe_relabel = biba_pipe_relabel, 3454 3455 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3456 .mpo_posixsem_check_open = biba_posixsem_check_openunlink, 3457 .mpo_posixsem_check_post = biba_posixsem_check_write, 3458 .mpo_posixsem_check_stat = biba_posixsem_check_rdonly, 3459 .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink, 3460 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3461 .mpo_posixsem_create = biba_posixsem_create, 3462 .mpo_posixsem_destroy_label = biba_destroy_label, 3463 .mpo_posixsem_init_label = biba_init_label, 3464 3465 .mpo_priv_check = biba_priv_check, 3466 3467 .mpo_proc_check_debug = biba_proc_check_debug, 3468 .mpo_proc_check_sched = biba_proc_check_sched, 3469 .mpo_proc_check_signal = biba_proc_check_signal, 3470 3471 .mpo_socket_check_deliver = biba_socket_check_deliver, 3472 .mpo_socket_check_relabel = biba_socket_check_relabel, 3473 .mpo_socket_check_visible = biba_socket_check_visible, 3474 .mpo_socket_copy_label = biba_copy_label, 3475 .mpo_socket_create = biba_socket_create, 3476 .mpo_socket_create_mbuf = biba_socket_create_mbuf, 3477 .mpo_socket_destroy_label = biba_destroy_label, 3478 .mpo_socket_externalize_label = biba_externalize_label, 3479 .mpo_socket_init_label = biba_init_label_waitcheck, 3480 .mpo_socket_internalize_label = biba_internalize_label, 3481 .mpo_socket_newconn = biba_socket_newconn, 3482 .mpo_socket_relabel = biba_socket_relabel, 3483 3484 .mpo_socketpeer_destroy_label = biba_destroy_label, 3485 .mpo_socketpeer_externalize_label = biba_externalize_label, 3486 .mpo_socketpeer_init_label = biba_init_label_waitcheck, 3487 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, 3488 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, 3489 3490 .mpo_syncache_create = biba_syncache_create, 3491 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf, 3492 .mpo_syncache_destroy_label = biba_destroy_label, 3493 .mpo_syncache_init_label = biba_init_label_waitcheck, 3494 3495 .mpo_system_check_acct = biba_system_check_acct, 3496 .mpo_system_check_auditctl = biba_system_check_auditctl, 3497 .mpo_system_check_auditon = biba_system_check_auditon, 3498 .mpo_system_check_swapoff = biba_system_check_swapoff, 3499 .mpo_system_check_swapon = biba_system_check_swapon, 3500 .mpo_system_check_sysctl = biba_system_check_sysctl, 3501 3502 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3503 .mpo_sysvmsg_create = biba_sysvmsg_create, 3504 .mpo_sysvmsg_destroy_label = biba_destroy_label, 3505 .mpo_sysvmsg_init_label = biba_init_label, 3506 3507 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3508 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3509 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3510 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3511 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3512 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3513 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3514 .mpo_sysvmsq_create = biba_sysvmsq_create, 3515 .mpo_sysvmsq_destroy_label = biba_destroy_label, 3516 .mpo_sysvmsq_init_label = biba_init_label, 3517 3518 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3519 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3520 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3521 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3522 .mpo_sysvsem_create = biba_sysvsem_create, 3523 .mpo_sysvsem_destroy_label = biba_destroy_label, 3524 .mpo_sysvsem_init_label = biba_init_label, 3525 3526 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3527 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3528 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3529 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3530 .mpo_sysvshm_create = biba_sysvshm_create, 3531 .mpo_sysvshm_destroy_label = biba_destroy_label, 3532 .mpo_sysvshm_init_label = biba_init_label, 3533 3534 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, 3535 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, 3536 .mpo_vnode_check_access = biba_vnode_check_open, 3537 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3538 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3539 .mpo_vnode_check_create = biba_vnode_check_create, 3540 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3541 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3542 .mpo_vnode_check_exec = biba_vnode_check_exec, 3543 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3544 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3545 .mpo_vnode_check_link = biba_vnode_check_link, 3546 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3547 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3548 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3549 .mpo_vnode_check_open = biba_vnode_check_open, 3550 .mpo_vnode_check_poll = biba_vnode_check_poll, 3551 .mpo_vnode_check_read = biba_vnode_check_read, 3552 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3553 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3554 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3555 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3556 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3557 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3558 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3559 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3560 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3561 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3562 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3563 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3564 .mpo_vnode_check_stat = biba_vnode_check_stat, 3565 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3566 .mpo_vnode_check_write = biba_vnode_check_write, 3567 .mpo_vnode_create_extattr = biba_vnode_create_extattr, 3568 .mpo_vnode_copy_label = biba_copy_label, 3569 .mpo_vnode_destroy_label = biba_destroy_label, 3570 .mpo_vnode_externalize_label = biba_externalize_label, 3571 .mpo_vnode_init_label = biba_init_label, 3572 .mpo_vnode_internalize_label = biba_internalize_label, 3573 .mpo_vnode_relabel = biba_vnode_relabel, 3574 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, 3575 }; 3576 3577 MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3578 MPC_LOADTIME_FLAG_NOTLATE, &biba_slot); 3579