1 /*- 2 * Copyright (c) 1999-2002, 2007 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; 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 int 819 biba_cred_check_relabel(struct ucred *cred, struct label *newlabel) 820 { 821 struct mac_biba *subj, *new; 822 int error; 823 824 subj = SLOT(cred->cr_label); 825 new = SLOT(newlabel); 826 827 /* 828 * If there is a Biba label update for the credential, it may 829 * be an update of the effective, range, or both. 830 */ 831 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 832 if (error) 833 return (error); 834 835 /* 836 * If the Biba label is to be changed, authorize as appropriate. 837 */ 838 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 839 /* 840 * If the change request modifies both the Biba label 841 * effective and range, check that the new effective will be 842 * in the new range. 843 */ 844 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 845 MAC_BIBA_FLAGS_BOTH && 846 !biba_effective_in_range(new, new)) 847 return (EINVAL); 848 849 /* 850 * To change the Biba effective label on a credential, the 851 * new effective label must be in the current range. 852 */ 853 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && 854 !biba_effective_in_range(new, subj)) 855 return (EPERM); 856 857 /* 858 * To change the Biba range on a credential, the new range 859 * label must be in the current range. 860 */ 861 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 862 !biba_range_in_range(new, subj)) 863 return (EPERM); 864 865 /* 866 * To have EQUAL in any component of the new credential Biba 867 * label, the subject must already have EQUAL in their label. 868 */ 869 if (biba_contains_equal(new)) { 870 error = biba_subject_privileged(subj); 871 if (error) 872 return (error); 873 } 874 } 875 876 return (0); 877 } 878 879 static int 880 biba_cred_check_visible(struct ucred *u1, struct ucred *u2) 881 { 882 struct mac_biba *subj, *obj; 883 884 if (!biba_enabled) 885 return (0); 886 887 subj = SLOT(u1->cr_label); 888 obj = SLOT(u2->cr_label); 889 890 /* XXX: range */ 891 if (!biba_dominate_effective(obj, subj)) 892 return (ESRCH); 893 894 return (0); 895 } 896 897 static void 898 biba_cred_relabel(struct ucred *cred, struct label *newlabel) 899 { 900 struct mac_biba *source, *dest; 901 902 source = SLOT(newlabel); 903 dest = SLOT(cred->cr_label); 904 905 biba_copy(source, dest); 906 } 907 908 static void 909 biba_devfs_create_device(struct ucred *cred, struct mount *mp, 910 struct cdev *dev, struct devfs_dirent *de, struct label *delabel) 911 { 912 struct mac_biba *mb; 913 int biba_type; 914 915 mb = SLOT(delabel); 916 if (strcmp(dev->si_name, "null") == 0 || 917 strcmp(dev->si_name, "zero") == 0 || 918 strcmp(dev->si_name, "random") == 0 || 919 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 920 biba_type = MAC_BIBA_TYPE_EQUAL; 921 else if (ptys_equal && 922 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 923 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 924 biba_type = MAC_BIBA_TYPE_EQUAL; 925 else 926 biba_type = MAC_BIBA_TYPE_HIGH; 927 biba_set_effective(mb, biba_type, 0, NULL); 928 } 929 930 static void 931 biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 932 struct devfs_dirent *de, struct label *delabel) 933 { 934 struct mac_biba *mb; 935 936 mb = SLOT(delabel); 937 938 biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL); 939 } 940 941 static void 942 biba_devfs_create_symlink(struct ucred *cred, struct mount *mp, 943 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 944 struct label *delabel) 945 { 946 struct mac_biba *source, *dest; 947 948 source = SLOT(cred->cr_label); 949 dest = SLOT(delabel); 950 951 biba_copy_effective(source, dest); 952 } 953 954 static void 955 biba_devfs_update(struct mount *mp, struct devfs_dirent *de, 956 struct label *delabel, struct vnode *vp, struct label *vplabel) 957 { 958 struct mac_biba *source, *dest; 959 960 source = SLOT(vplabel); 961 dest = SLOT(delabel); 962 963 biba_copy(source, dest); 964 } 965 966 static void 967 biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel, 968 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 969 struct label *vplabel) 970 { 971 struct mac_biba *source, *dest; 972 973 source = SLOT(delabel); 974 dest = SLOT(vplabel); 975 976 biba_copy_effective(source, dest); 977 } 978 979 static int 980 biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 981 struct label *ifplabel, struct label *newlabel) 982 { 983 struct mac_biba *subj, *new; 984 int error; 985 986 subj = SLOT(cred->cr_label); 987 new = SLOT(newlabel); 988 989 /* 990 * If there is a Biba label update for the interface, it may be an 991 * update of the effective, range, or both. 992 */ 993 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 994 if (error) 995 return (error); 996 997 /* 998 * Relabling network interfaces requires Biba privilege. 999 */ 1000 error = biba_subject_privileged(subj); 1001 if (error) 1002 return (error); 1003 1004 return (0); 1005 } 1006 1007 static int 1008 biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1009 struct mbuf *m, struct label *mlabel) 1010 { 1011 struct mac_biba *p, *i; 1012 1013 if (!biba_enabled) 1014 return (0); 1015 1016 p = SLOT(mlabel); 1017 i = SLOT(ifplabel); 1018 1019 return (biba_effective_in_range(p, i) ? 0 : EACCES); 1020 } 1021 1022 static void 1023 biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1024 { 1025 char tifname[IFNAMSIZ], *p, *q; 1026 char tiflist[sizeof(trusted_interfaces)]; 1027 struct mac_biba *dest; 1028 int len, type; 1029 1030 dest = SLOT(ifplabel); 1031 1032 if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) { 1033 type = MAC_BIBA_TYPE_EQUAL; 1034 goto set; 1035 } 1036 1037 if (trust_all_interfaces) { 1038 type = MAC_BIBA_TYPE_HIGH; 1039 goto set; 1040 } 1041 1042 type = MAC_BIBA_TYPE_LOW; 1043 1044 if (trusted_interfaces[0] == '\0' || 1045 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1046 goto set; 1047 1048 bzero(tiflist, sizeof(tiflist)); 1049 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1050 if(*p != ' ' && *p != '\t') 1051 *q = *p; 1052 1053 for (p = q = tiflist;; p++) { 1054 if (*p == ',' || *p == '\0') { 1055 len = p - q; 1056 if (len < IFNAMSIZ) { 1057 bzero(tifname, sizeof(tifname)); 1058 bcopy(q, tifname, len); 1059 if (strcmp(tifname, ifp->if_xname) == 0) { 1060 type = MAC_BIBA_TYPE_HIGH; 1061 break; 1062 } 1063 } else { 1064 *p = '\0'; 1065 printf("mac_biba warning: interface name " 1066 "\"%s\" is too long (must be < %d)\n", 1067 q, IFNAMSIZ); 1068 } 1069 if (*p == '\0') 1070 break; 1071 q = p + 1; 1072 } 1073 } 1074 set: 1075 biba_set_effective(dest, type, 0, NULL); 1076 biba_set_range(dest, type, 0, NULL, type, 0, NULL); 1077 } 1078 1079 static void 1080 biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1081 struct mbuf *m, struct label *mlabel) 1082 { 1083 struct mac_biba *source, *dest; 1084 1085 source = SLOT(ifplabel); 1086 dest = SLOT(mlabel); 1087 1088 biba_copy_effective(source, dest); 1089 } 1090 1091 static void 1092 biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1093 struct label *ifplabel, struct label *newlabel) 1094 { 1095 struct mac_biba *source, *dest; 1096 1097 source = SLOT(newlabel); 1098 dest = SLOT(ifplabel); 1099 1100 biba_copy(source, dest); 1101 } 1102 1103 static int 1104 biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1105 struct mbuf *m, struct label *mlabel) 1106 { 1107 struct mac_biba *p, *i; 1108 1109 if (!biba_enabled) 1110 return (0); 1111 1112 p = SLOT(mlabel); 1113 i = SLOT(inplabel); 1114 1115 return (biba_equal_effective(p, i) ? 0 : EACCES); 1116 } 1117 1118 static void 1119 biba_inpcb_create(struct socket *so, struct label *solabel, 1120 struct inpcb *inp, struct label *inplabel) 1121 { 1122 struct mac_biba *source, *dest; 1123 1124 source = SLOT(solabel); 1125 dest = SLOT(inplabel); 1126 1127 biba_copy_effective(source, dest); 1128 } 1129 1130 static void 1131 biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1132 struct mbuf *m, struct label *mlabel) 1133 { 1134 struct mac_biba *source, *dest; 1135 1136 source = SLOT(inplabel); 1137 dest = SLOT(mlabel); 1138 1139 biba_copy_effective(source, dest); 1140 } 1141 1142 static void 1143 biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1144 struct inpcb *inp, struct label *inplabel) 1145 { 1146 struct mac_biba *source, *dest; 1147 1148 source = SLOT(solabel); 1149 dest = SLOT(inplabel); 1150 1151 biba_copy(source, dest); 1152 } 1153 1154 static void 1155 biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, 1156 struct label *qlabel) 1157 { 1158 struct mac_biba *source, *dest; 1159 1160 source = SLOT(mlabel); 1161 dest = SLOT(qlabel); 1162 1163 biba_copy_effective(source, dest); 1164 } 1165 1166 static int 1167 biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, 1168 struct label *qlabel) 1169 { 1170 struct mac_biba *a, *b; 1171 1172 a = SLOT(qlabel); 1173 b = SLOT(mlabel); 1174 1175 return (biba_equal_effective(a, b)); 1176 } 1177 1178 static void 1179 biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, 1180 struct label *mlabel) 1181 { 1182 struct mac_biba *source, *dest; 1183 1184 source = SLOT(qlabel); 1185 dest = SLOT(mlabel); 1186 1187 /* Just use the head, since we require them all to match. */ 1188 biba_copy_effective(source, dest); 1189 } 1190 1191 static void 1192 biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, 1193 struct label *qlabel) 1194 { 1195 1196 /* NOOP: we only accept matching labels, so no need to update */ 1197 } 1198 1199 static int 1200 biba_kld_check_load(struct ucred *cred, struct vnode *vp, 1201 struct label *vplabel) 1202 { 1203 struct mac_biba *subj, *obj; 1204 int error; 1205 1206 if (!biba_enabled) 1207 return (0); 1208 1209 subj = SLOT(cred->cr_label); 1210 1211 error = biba_subject_privileged(subj); 1212 if (error) 1213 return (error); 1214 1215 obj = SLOT(vplabel); 1216 if (!biba_high_effective(obj)) 1217 return (EACCES); 1218 1219 return (0); 1220 } 1221 1222 static int 1223 biba_mount_check_stat(struct ucred *cred, struct mount *mp, 1224 struct label *mplabel) 1225 { 1226 struct mac_biba *subj, *obj; 1227 1228 if (!biba_enabled) 1229 return (0); 1230 1231 subj = SLOT(cred->cr_label); 1232 obj = SLOT(mplabel); 1233 1234 if (!biba_dominate_effective(obj, subj)) 1235 return (EACCES); 1236 1237 return (0); 1238 } 1239 1240 static void 1241 biba_mount_create(struct ucred *cred, struct mount *mp, 1242 struct label *mplabel) 1243 { 1244 struct mac_biba *source, *dest; 1245 1246 source = SLOT(cred->cr_label); 1247 dest = SLOT(mplabel); 1248 1249 biba_copy_effective(source, dest); 1250 } 1251 1252 static void 1253 biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1254 struct mbuf *m, struct label *mlabel) 1255 { 1256 struct mac_biba *dest; 1257 1258 dest = SLOT(mlabel); 1259 1260 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1261 } 1262 1263 static void 1264 biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1265 struct mbuf *m, struct label *mlabel) 1266 { 1267 struct mac_biba *dest; 1268 1269 dest = SLOT(mlabel); 1270 1271 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1272 } 1273 1274 static void 1275 biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1276 struct mbuf *msend, struct label *msendlabel) 1277 { 1278 struct mac_biba *source, *dest; 1279 1280 source = SLOT(mrecvlabel); 1281 dest = SLOT(msendlabel); 1282 1283 biba_copy_effective(source, dest); 1284 } 1285 1286 static void 1287 biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1288 { 1289 struct mac_biba *dest; 1290 1291 dest = SLOT(mlabel); 1292 1293 /* XXX: where is the label for the firewall really coming from? */ 1294 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1295 } 1296 1297 static void 1298 biba_netinet_fragment(struct mbuf *m, struct label *mlabel, 1299 struct mbuf *frag, struct label *fraglabel) 1300 { 1301 struct mac_biba *source, *dest; 1302 1303 source = SLOT(mlabel); 1304 dest = SLOT(fraglabel); 1305 1306 biba_copy_effective(source, dest); 1307 } 1308 1309 static void 1310 biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1311 struct mbuf *msend, struct label *msendlabel) 1312 { 1313 struct mac_biba *source, *dest; 1314 1315 source = SLOT(mrecvlabel); 1316 dest = SLOT(msendlabel); 1317 1318 biba_copy_effective(source, dest); 1319 } 1320 1321 static void 1322 biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1323 struct mbuf *m, struct label *mlabel) 1324 { 1325 struct mac_biba *dest; 1326 1327 dest = SLOT(mlabel); 1328 1329 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1330 } 1331 1332 static void 1333 biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1334 struct mbuf *m, struct label *mlabel) 1335 { 1336 struct mac_biba *dest; 1337 1338 dest = SLOT(mlabel); 1339 1340 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1341 } 1342 1343 static int 1344 biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1345 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1346 { 1347 1348 if(!biba_enabled) 1349 return (0); 1350 1351 /* XXX: This will be implemented soon... */ 1352 1353 return (0); 1354 } 1355 1356 static int 1357 biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1358 struct label *pplabel) 1359 { 1360 struct mac_biba *subj, *obj; 1361 1362 if (!biba_enabled) 1363 return (0); 1364 1365 subj = SLOT(cred->cr_label); 1366 obj = SLOT(pplabel); 1367 1368 if (!biba_dominate_effective(obj, subj)) 1369 return (EACCES); 1370 1371 return (0); 1372 } 1373 1374 static int 1375 biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1376 struct label *pplabel) 1377 { 1378 struct mac_biba *subj, *obj; 1379 1380 if (!biba_enabled) 1381 return (0); 1382 1383 subj = SLOT(cred->cr_label); 1384 obj = SLOT(pplabel); 1385 1386 if (!biba_dominate_effective(obj, subj)) 1387 return (EACCES); 1388 1389 return (0); 1390 } 1391 1392 static int 1393 biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1394 struct label *pplabel, struct label *newlabel) 1395 { 1396 struct mac_biba *subj, *obj, *new; 1397 int error; 1398 1399 new = SLOT(newlabel); 1400 subj = SLOT(cred->cr_label); 1401 obj = SLOT(pplabel); 1402 1403 /* 1404 * If there is a Biba label update for a pipe, it must be a effective 1405 * update. 1406 */ 1407 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1408 if (error) 1409 return (error); 1410 1411 /* 1412 * To perform a relabel of a pipe (Biba label or not), Biba must 1413 * authorize the relabel. 1414 */ 1415 if (!biba_effective_in_range(obj, subj)) 1416 return (EPERM); 1417 1418 /* 1419 * If the Biba label is to be changed, authorize as appropriate. 1420 */ 1421 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1422 /* 1423 * To change the Biba label on a pipe, the new pipe label 1424 * must be in the subject range. 1425 */ 1426 if (!biba_effective_in_range(new, subj)) 1427 return (EPERM); 1428 1429 /* 1430 * To change the Biba label on a pipe to be EQUAL, the 1431 * subject must have appropriate privilege. 1432 */ 1433 if (biba_contains_equal(new)) { 1434 error = biba_subject_privileged(subj); 1435 if (error) 1436 return (error); 1437 } 1438 } 1439 1440 return (0); 1441 } 1442 1443 static int 1444 biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 1445 struct label *pplabel) 1446 { 1447 struct mac_biba *subj, *obj; 1448 1449 if (!biba_enabled) 1450 return (0); 1451 1452 subj = SLOT(cred->cr_label); 1453 obj = SLOT(pplabel); 1454 1455 if (!biba_dominate_effective(obj, subj)) 1456 return (EACCES); 1457 1458 return (0); 1459 } 1460 1461 static int 1462 biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1463 struct label *pplabel) 1464 { 1465 struct mac_biba *subj, *obj; 1466 1467 if (!biba_enabled) 1468 return (0); 1469 1470 subj = SLOT(cred->cr_label); 1471 obj = SLOT(pplabel); 1472 1473 if (!biba_dominate_effective(subj, obj)) 1474 return (EACCES); 1475 1476 return (0); 1477 } 1478 1479 static void 1480 biba_pipe_create(struct ucred *cred, struct pipepair *pp, 1481 struct label *pplabel) 1482 { 1483 struct mac_biba *source, *dest; 1484 1485 source = SLOT(cred->cr_label); 1486 dest = SLOT(pplabel); 1487 1488 biba_copy_effective(source, dest); 1489 } 1490 1491 static void 1492 biba_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1493 struct label *pplabel, struct label *newlabel) 1494 { 1495 struct mac_biba *source, *dest; 1496 1497 source = SLOT(newlabel); 1498 dest = SLOT(pplabel); 1499 1500 biba_copy(source, dest); 1501 } 1502 1503 static int 1504 biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks, 1505 struct label *kslabel) 1506 { 1507 struct mac_biba *subj, *obj; 1508 1509 if (!biba_enabled) 1510 return (0); 1511 1512 subj = SLOT(cred->cr_label); 1513 obj = SLOT(kslabel); 1514 1515 if (!biba_dominate_effective(subj, obj)) 1516 return (EACCES); 1517 1518 return (0); 1519 } 1520 1521 static int 1522 biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred, 1523 struct ksem *ks, struct label *kslabel) 1524 { 1525 struct mac_biba *subj, *obj; 1526 1527 if (!biba_enabled) 1528 return (0); 1529 1530 subj = SLOT(active_cred->cr_label); 1531 obj = SLOT(kslabel); 1532 1533 if (!biba_dominate_effective(subj, obj)) 1534 return (EACCES); 1535 1536 return (0); 1537 } 1538 1539 static int 1540 biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred, 1541 struct ksem *ks, struct label *kslabel) 1542 { 1543 struct mac_biba *subj, *obj; 1544 1545 if (!biba_enabled) 1546 return (0); 1547 1548 subj = SLOT(active_cred->cr_label); 1549 obj = SLOT(kslabel); 1550 1551 if (!biba_dominate_effective(obj, subj)) 1552 return (EACCES); 1553 1554 return (0); 1555 } 1556 1557 static void 1558 biba_posixsem_create(struct ucred *cred, struct ksem *ks, 1559 struct label *kslabel) 1560 { 1561 struct mac_biba *source, *dest; 1562 1563 source = SLOT(cred->cr_label); 1564 dest = SLOT(kslabel); 1565 1566 biba_copy_effective(source, dest); 1567 } 1568 1569 /* 1570 * Some system privileges are allowed regardless of integrity grade; others 1571 * are allowed only when running with privilege with respect to the Biba 1572 * policy as they might otherwise allow bypassing of the integrity policy. 1573 */ 1574 static int 1575 biba_priv_check(struct ucred *cred, int priv) 1576 { 1577 struct mac_biba *subj; 1578 int error; 1579 1580 if (!biba_enabled) 1581 return (0); 1582 1583 /* 1584 * Exempt only specific privileges from the Biba integrity policy. 1585 */ 1586 switch (priv) { 1587 case PRIV_KTRACE: 1588 case PRIV_MSGBUF: 1589 1590 /* 1591 * Allow processes to manipulate basic process audit properties, and 1592 * to submit audit records. 1593 */ 1594 case PRIV_AUDIT_GETAUDIT: 1595 case PRIV_AUDIT_SETAUDIT: 1596 case PRIV_AUDIT_SUBMIT: 1597 1598 /* 1599 * Allow processes to manipulate their regular UNIX credentials. 1600 */ 1601 case PRIV_CRED_SETUID: 1602 case PRIV_CRED_SETEUID: 1603 case PRIV_CRED_SETGID: 1604 case PRIV_CRED_SETEGID: 1605 case PRIV_CRED_SETGROUPS: 1606 case PRIV_CRED_SETREUID: 1607 case PRIV_CRED_SETREGID: 1608 case PRIV_CRED_SETRESUID: 1609 case PRIV_CRED_SETRESGID: 1610 1611 /* 1612 * Allow processes to perform system monitoring. 1613 */ 1614 case PRIV_SEEOTHERGIDS: 1615 case PRIV_SEEOTHERUIDS: 1616 break; 1617 1618 /* 1619 * Allow access to general process debugging facilities. We 1620 * separately control debugging based on MAC label. 1621 */ 1622 case PRIV_DEBUG_DIFFCRED: 1623 case PRIV_DEBUG_SUGID: 1624 case PRIV_DEBUG_UNPRIV: 1625 1626 /* 1627 * Allow manipulating jails. 1628 */ 1629 case PRIV_JAIL_ATTACH: 1630 1631 /* 1632 * Allow privilege with respect to the Partition policy, but not the 1633 * Privs policy. 1634 */ 1635 case PRIV_MAC_PARTITION: 1636 1637 /* 1638 * Allow privilege with respect to process resource limits and login 1639 * context. 1640 */ 1641 case PRIV_PROC_LIMIT: 1642 case PRIV_PROC_SETLOGIN: 1643 case PRIV_PROC_SETRLIMIT: 1644 1645 /* 1646 * Allow System V and POSIX IPC privileges. 1647 */ 1648 case PRIV_IPC_READ: 1649 case PRIV_IPC_WRITE: 1650 case PRIV_IPC_ADMIN: 1651 case PRIV_IPC_MSGSIZE: 1652 case PRIV_MQ_ADMIN: 1653 1654 /* 1655 * Allow certain scheduler manipulations -- possibly this should be 1656 * controlled by more fine-grained policy, as potentially low 1657 * integrity processes can deny CPU to higher integrity ones. 1658 */ 1659 case PRIV_SCHED_DIFFCRED: 1660 case PRIV_SCHED_SETPRIORITY: 1661 case PRIV_SCHED_RTPRIO: 1662 case PRIV_SCHED_SETPOLICY: 1663 case PRIV_SCHED_SET: 1664 case PRIV_SCHED_SETPARAM: 1665 1666 /* 1667 * More IPC privileges. 1668 */ 1669 case PRIV_SEM_WRITE: 1670 1671 /* 1672 * Allow signaling privileges subject to integrity policy. 1673 */ 1674 case PRIV_SIGNAL_DIFFCRED: 1675 case PRIV_SIGNAL_SUGID: 1676 1677 /* 1678 * Allow access to only limited sysctls from lower integrity levels; 1679 * piggy-back on the Jail definition. 1680 */ 1681 case PRIV_SYSCTL_WRITEJAIL: 1682 1683 /* 1684 * Allow TTY-based privileges, subject to general device access using 1685 * labels on TTY device nodes, but not console privilege. 1686 */ 1687 case PRIV_TTY_DRAINWAIT: 1688 case PRIV_TTY_DTRWAIT: 1689 case PRIV_TTY_EXCLUSIVE: 1690 case PRIV_TTY_PRISON: 1691 case PRIV_TTY_STI: 1692 case PRIV_TTY_SETA: 1693 1694 /* 1695 * Grant most VFS privileges, as almost all are in practice bounded 1696 * by more specific checks using labels. 1697 */ 1698 case PRIV_VFS_READ: 1699 case PRIV_VFS_WRITE: 1700 case PRIV_VFS_ADMIN: 1701 case PRIV_VFS_EXEC: 1702 case PRIV_VFS_LOOKUP: 1703 case PRIV_VFS_CHFLAGS_DEV: 1704 case PRIV_VFS_CHOWN: 1705 case PRIV_VFS_CHROOT: 1706 case PRIV_VFS_RETAINSUGID: 1707 case PRIV_VFS_EXCEEDQUOTA: 1708 case PRIV_VFS_FCHROOT: 1709 case PRIV_VFS_FHOPEN: 1710 case PRIV_VFS_FHSTATFS: 1711 case PRIV_VFS_GENERATION: 1712 case PRIV_VFS_GETFH: 1713 case PRIV_VFS_GETQUOTA: 1714 case PRIV_VFS_LINK: 1715 case PRIV_VFS_MOUNT: 1716 case PRIV_VFS_MOUNT_OWNER: 1717 case PRIV_VFS_MOUNT_PERM: 1718 case PRIV_VFS_MOUNT_SUIDDIR: 1719 case PRIV_VFS_MOUNT_NONUSER: 1720 case PRIV_VFS_SETGID: 1721 case PRIV_VFS_STICKYFILE: 1722 case PRIV_VFS_SYSFLAGS: 1723 case PRIV_VFS_UNMOUNT: 1724 1725 /* 1726 * Allow VM privileges; it would be nice if these were subject to 1727 * resource limits. 1728 */ 1729 case PRIV_VM_MADV_PROTECT: 1730 case PRIV_VM_MLOCK: 1731 case PRIV_VM_MUNLOCK: 1732 1733 /* 1734 * Allow some but not all network privileges. In general, dont allow 1735 * reconfiguring the network stack, just normal use. 1736 */ 1737 case PRIV_NETATALK_RESERVEDPORT: 1738 case PRIV_NETINET_RESERVEDPORT: 1739 case PRIV_NETINET_RAW: 1740 case PRIV_NETINET_REUSEPORT: 1741 case PRIV_NETIPX_RESERVEDPORT: 1742 case PRIV_NETIPX_RAW: 1743 break; 1744 1745 /* 1746 * All remaining system privileges are allow only if the process 1747 * holds privilege with respect to the Biba policy. 1748 */ 1749 default: 1750 subj = SLOT(cred->cr_label); 1751 error = biba_subject_privileged(subj); 1752 if (error) 1753 return (error); 1754 } 1755 return (0); 1756 } 1757 1758 static void 1759 biba_proc_associate_nfsd(struct ucred *cred) 1760 { 1761 struct mac_biba *label; 1762 1763 label = SLOT(cred->cr_label); 1764 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); 1765 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1766 0, NULL); 1767 } 1768 1769 static int 1770 biba_proc_check_debug(struct ucred *cred, struct proc *p) 1771 { 1772 struct mac_biba *subj, *obj; 1773 1774 if (!biba_enabled) 1775 return (0); 1776 1777 subj = SLOT(cred->cr_label); 1778 obj = SLOT(p->p_ucred->cr_label); 1779 1780 /* XXX: range checks */ 1781 if (!biba_dominate_effective(obj, subj)) 1782 return (ESRCH); 1783 if (!biba_dominate_effective(subj, obj)) 1784 return (EACCES); 1785 1786 return (0); 1787 } 1788 1789 static int 1790 biba_proc_check_sched(struct ucred *cred, struct proc *p) 1791 { 1792 struct mac_biba *subj, *obj; 1793 1794 if (!biba_enabled) 1795 return (0); 1796 1797 subj = SLOT(cred->cr_label); 1798 obj = SLOT(p->p_ucred->cr_label); 1799 1800 /* XXX: range checks */ 1801 if (!biba_dominate_effective(obj, subj)) 1802 return (ESRCH); 1803 if (!biba_dominate_effective(subj, obj)) 1804 return (EACCES); 1805 1806 return (0); 1807 } 1808 1809 static int 1810 biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1811 { 1812 struct mac_biba *subj, *obj; 1813 1814 if (!biba_enabled) 1815 return (0); 1816 1817 subj = SLOT(cred->cr_label); 1818 obj = SLOT(p->p_ucred->cr_label); 1819 1820 /* XXX: range checks */ 1821 if (!biba_dominate_effective(obj, subj)) 1822 return (ESRCH); 1823 if (!biba_dominate_effective(subj, obj)) 1824 return (EACCES); 1825 1826 return (0); 1827 } 1828 1829 static int 1830 biba_socket_check_deliver(struct socket *so, struct label *solabel, 1831 struct mbuf *m, struct label *mlabel) 1832 { 1833 struct mac_biba *p, *s; 1834 1835 if (!biba_enabled) 1836 return (0); 1837 1838 p = SLOT(mlabel); 1839 s = SLOT(solabel); 1840 1841 return (biba_equal_effective(p, s) ? 0 : EACCES); 1842 } 1843 1844 static void 1845 biba_proc_create_init(struct ucred *cred) 1846 { 1847 struct mac_biba *dest; 1848 1849 dest = SLOT(cred->cr_label); 1850 1851 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1852 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1853 0, NULL); 1854 } 1855 1856 static void 1857 biba_proc_create_swapper(struct ucred *cred) 1858 { 1859 struct mac_biba *dest; 1860 1861 dest = SLOT(cred->cr_label); 1862 1863 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1864 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1865 0, NULL); 1866 } 1867 1868 static int 1869 biba_socket_check_relabel(struct ucred *cred, struct socket *so, 1870 struct label *solabel, struct label *newlabel) 1871 { 1872 struct mac_biba *subj, *obj, *new; 1873 int error; 1874 1875 new = SLOT(newlabel); 1876 subj = SLOT(cred->cr_label); 1877 obj = SLOT(solabel); 1878 1879 /* 1880 * If there is a Biba label update for the socket, it may be an 1881 * update of effective. 1882 */ 1883 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1884 if (error) 1885 return (error); 1886 1887 /* 1888 * To relabel a socket, the old socket effective must be in the 1889 * subject range. 1890 */ 1891 if (!biba_effective_in_range(obj, subj)) 1892 return (EPERM); 1893 1894 /* 1895 * If the Biba label is to be changed, authorize as appropriate. 1896 */ 1897 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1898 /* 1899 * To relabel a socket, the new socket effective must be in 1900 * the subject range. 1901 */ 1902 if (!biba_effective_in_range(new, subj)) 1903 return (EPERM); 1904 1905 /* 1906 * To change the Biba label on the socket to contain EQUAL, 1907 * the subject must have appropriate privilege. 1908 */ 1909 if (biba_contains_equal(new)) { 1910 error = biba_subject_privileged(subj); 1911 if (error) 1912 return (error); 1913 } 1914 } 1915 1916 return (0); 1917 } 1918 1919 static int 1920 biba_socket_check_visible(struct ucred *cred, struct socket *so, 1921 struct label *solabel) 1922 { 1923 struct mac_biba *subj, *obj; 1924 1925 if (!biba_enabled) 1926 return (0); 1927 1928 subj = SLOT(cred->cr_label); 1929 obj = SLOT(solabel); 1930 1931 if (!biba_dominate_effective(obj, subj)) 1932 return (ENOENT); 1933 1934 return (0); 1935 } 1936 1937 static void 1938 biba_socket_create(struct ucred *cred, struct socket *so, 1939 struct label *solabel) 1940 { 1941 struct mac_biba *source, *dest; 1942 1943 source = SLOT(cred->cr_label); 1944 dest = SLOT(solabel); 1945 1946 biba_copy_effective(source, dest); 1947 } 1948 1949 static void 1950 biba_socket_create_mbuf(struct socket *so, struct label *solabel, 1951 struct mbuf *m, struct label *mlabel) 1952 { 1953 struct mac_biba *source, *dest; 1954 1955 source = SLOT(solabel); 1956 dest = SLOT(mlabel); 1957 1958 biba_copy_effective(source, dest); 1959 } 1960 1961 static void 1962 biba_socket_newconn(struct socket *oldso, struct label *oldsolabel, 1963 struct socket *newso, struct label *newsolabel) 1964 { 1965 struct mac_biba *source, *dest; 1966 1967 source = SLOT(oldsolabel); 1968 dest = SLOT(newsolabel); 1969 1970 biba_copy_effective(source, dest); 1971 } 1972 1973 static void 1974 biba_socket_relabel(struct ucred *cred, struct socket *so, 1975 struct label *solabel, struct label *newlabel) 1976 { 1977 struct mac_biba *source, *dest; 1978 1979 source = SLOT(newlabel); 1980 dest = SLOT(solabel); 1981 1982 biba_copy(source, dest); 1983 } 1984 1985 static void 1986 biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 1987 struct socket *so, struct label *sopeerlabel) 1988 { 1989 struct mac_biba *source, *dest; 1990 1991 source = SLOT(mlabel); 1992 dest = SLOT(sopeerlabel); 1993 1994 biba_copy_effective(source, dest); 1995 } 1996 1997 static void 1998 biba_socketpeer_set_from_socket(struct socket *oldso, 1999 struct label *oldsolabel, struct socket *newso, 2000 struct label *newsopeerlabel) 2001 { 2002 struct mac_biba *source, *dest; 2003 2004 source = SLOT(oldsolabel); 2005 dest = SLOT(newsopeerlabel); 2006 2007 biba_copy_effective(source, dest); 2008 } 2009 2010 static void 2011 biba_syncache_create(struct label *label, struct inpcb *inp) 2012 { 2013 struct mac_biba *source, *dest; 2014 2015 source = SLOT(inp->inp_label); 2016 dest = SLOT(label); 2017 biba_copy_effective(source, dest); 2018 } 2019 2020 static void 2021 biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2022 struct label *mlabel) 2023 { 2024 struct mac_biba *source, *dest; 2025 2026 source = SLOT(sc_label); 2027 dest = SLOT(mlabel); 2028 biba_copy_effective(source, dest); 2029 } 2030 2031 static int 2032 biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2033 struct label *vplabel) 2034 { 2035 struct mac_biba *subj, *obj; 2036 int error; 2037 2038 if (!biba_enabled) 2039 return (0); 2040 2041 subj = SLOT(cred->cr_label); 2042 2043 error = biba_subject_privileged(subj); 2044 if (error) 2045 return (error); 2046 2047 if (vplabel == NULL) 2048 return (0); 2049 2050 obj = SLOT(vplabel); 2051 if (!biba_high_effective(obj)) 2052 return (EACCES); 2053 2054 return (0); 2055 } 2056 2057 static int 2058 biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2059 struct label *vplabel) 2060 { 2061 struct mac_biba *subj, *obj; 2062 int error; 2063 2064 if (!biba_enabled) 2065 return (0); 2066 2067 subj = SLOT(cred->cr_label); 2068 2069 error = biba_subject_privileged(subj); 2070 if (error) 2071 return (error); 2072 2073 if (vplabel == NULL) 2074 return (0); 2075 2076 obj = SLOT(vplabel); 2077 if (!biba_high_effective(obj)) 2078 return (EACCES); 2079 2080 return (0); 2081 } 2082 2083 static int 2084 biba_system_check_auditon(struct ucred *cred, int cmd) 2085 { 2086 struct mac_biba *subj; 2087 int error; 2088 2089 if (!biba_enabled) 2090 return (0); 2091 2092 subj = SLOT(cred->cr_label); 2093 2094 error = biba_subject_privileged(subj); 2095 if (error) 2096 return (error); 2097 2098 return (0); 2099 } 2100 2101 static int 2102 biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2103 struct label *label) 2104 { 2105 struct mac_biba *subj; 2106 int error; 2107 2108 if (!biba_enabled) 2109 return (0); 2110 2111 subj = SLOT(cred->cr_label); 2112 2113 error = biba_subject_privileged(subj); 2114 if (error) 2115 return (error); 2116 2117 return (0); 2118 } 2119 2120 static int 2121 biba_system_check_swapon(struct ucred *cred, struct vnode *vp, 2122 struct label *vplabel) 2123 { 2124 struct mac_biba *subj, *obj; 2125 int error; 2126 2127 if (!biba_enabled) 2128 return (0); 2129 2130 subj = SLOT(cred->cr_label); 2131 obj = SLOT(vplabel); 2132 2133 error = biba_subject_privileged(subj); 2134 if (error) 2135 return (error); 2136 2137 if (!biba_high_effective(obj)) 2138 return (EACCES); 2139 2140 return (0); 2141 } 2142 2143 static int 2144 biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2145 void *arg1, int arg2, struct sysctl_req *req) 2146 { 2147 struct mac_biba *subj; 2148 int error; 2149 2150 if (!biba_enabled) 2151 return (0); 2152 2153 subj = SLOT(cred->cr_label); 2154 2155 /* 2156 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2157 * but also require privilege to change them. 2158 */ 2159 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2160 if (!biba_subject_dominate_high(subj)) 2161 return (EACCES); 2162 2163 error = biba_subject_privileged(subj); 2164 if (error) 2165 return (error); 2166 } 2167 2168 return (0); 2169 } 2170 2171 static void 2172 biba_sysvmsg_cleanup(struct label *msglabel) 2173 { 2174 2175 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 2176 } 2177 2178 static void 2179 biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2180 struct label *msqlabel, struct msg *msgptr, struct label *msglabel) 2181 { 2182 struct mac_biba *source, *dest; 2183 2184 /* Ignore the msgq label */ 2185 source = SLOT(cred->cr_label); 2186 dest = SLOT(msglabel); 2187 2188 biba_copy_effective(source, dest); 2189 } 2190 2191 static int 2192 biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 2193 struct label *msglabel) 2194 { 2195 struct mac_biba *subj, *obj; 2196 2197 if (!biba_enabled) 2198 return (0); 2199 2200 subj = SLOT(cred->cr_label); 2201 obj = SLOT(msglabel); 2202 2203 if (!biba_dominate_effective(obj, subj)) 2204 return (EACCES); 2205 2206 return (0); 2207 } 2208 2209 static int 2210 biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 2211 struct label *msglabel) 2212 { 2213 struct mac_biba *subj, *obj; 2214 2215 if (!biba_enabled) 2216 return (0); 2217 2218 subj = SLOT(cred->cr_label); 2219 obj = SLOT(msglabel); 2220 2221 if (!biba_dominate_effective(subj, obj)) 2222 return (EACCES); 2223 2224 return (0); 2225 } 2226 2227 static int 2228 biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 2229 struct label *msqklabel) 2230 { 2231 struct mac_biba *subj, *obj; 2232 2233 if (!biba_enabled) 2234 return (0); 2235 2236 subj = SLOT(cred->cr_label); 2237 obj = SLOT(msqklabel); 2238 2239 if (!biba_dominate_effective(obj, subj)) 2240 return (EACCES); 2241 2242 return (0); 2243 } 2244 2245 static int 2246 biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 2247 struct label *msqklabel) 2248 { 2249 struct mac_biba *subj, *obj; 2250 2251 if (!biba_enabled) 2252 return (0); 2253 2254 subj = SLOT(cred->cr_label); 2255 obj = SLOT(msqklabel); 2256 2257 if (!biba_dominate_effective(subj, obj)) 2258 return (EACCES); 2259 2260 return (0); 2261 } 2262 2263 static int 2264 biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 2265 struct label *msqklabel) 2266 { 2267 struct mac_biba *subj, *obj; 2268 2269 if (!biba_enabled) 2270 return (0); 2271 2272 subj = SLOT(cred->cr_label); 2273 obj = SLOT(msqklabel); 2274 2275 if (!biba_dominate_effective(obj, subj)) 2276 return (EACCES); 2277 2278 return (0); 2279 } 2280 2281 static int 2282 biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 2283 struct label *msqklabel, int cmd) 2284 { 2285 struct mac_biba *subj, *obj; 2286 2287 if (!biba_enabled) 2288 return (0); 2289 2290 subj = SLOT(cred->cr_label); 2291 obj = SLOT(msqklabel); 2292 2293 switch(cmd) { 2294 case IPC_RMID: 2295 case IPC_SET: 2296 if (!biba_dominate_effective(subj, obj)) 2297 return (EACCES); 2298 break; 2299 2300 case IPC_STAT: 2301 if (!biba_dominate_effective(obj, subj)) 2302 return (EACCES); 2303 break; 2304 2305 default: 2306 return (EACCES); 2307 } 2308 2309 return (0); 2310 } 2311 2312 static void 2313 biba_sysvmsq_cleanup(struct label *msqlabel) 2314 { 2315 2316 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 2317 } 2318 2319 static void 2320 biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2321 struct label *msqlabel) 2322 { 2323 struct mac_biba *source, *dest; 2324 2325 source = SLOT(cred->cr_label); 2326 dest = SLOT(msqlabel); 2327 2328 biba_copy_effective(source, dest); 2329 } 2330 2331 static int 2332 biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 2333 struct label *semaklabel, int cmd) 2334 { 2335 struct mac_biba *subj, *obj; 2336 2337 if (!biba_enabled) 2338 return (0); 2339 2340 subj = SLOT(cred->cr_label); 2341 obj = SLOT(semaklabel); 2342 2343 switch(cmd) { 2344 case IPC_RMID: 2345 case IPC_SET: 2346 case SETVAL: 2347 case SETALL: 2348 if (!biba_dominate_effective(subj, obj)) 2349 return (EACCES); 2350 break; 2351 2352 case IPC_STAT: 2353 case GETVAL: 2354 case GETPID: 2355 case GETNCNT: 2356 case GETZCNT: 2357 case GETALL: 2358 if (!biba_dominate_effective(obj, subj)) 2359 return (EACCES); 2360 break; 2361 2362 default: 2363 return (EACCES); 2364 } 2365 2366 return (0); 2367 } 2368 2369 static int 2370 biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 2371 struct label *semaklabel) 2372 { 2373 struct mac_biba *subj, *obj; 2374 2375 if (!biba_enabled) 2376 return (0); 2377 2378 subj = SLOT(cred->cr_label); 2379 obj = SLOT(semaklabel); 2380 2381 if (!biba_dominate_effective(obj, subj)) 2382 return (EACCES); 2383 2384 return (0); 2385 } 2386 2387 static int 2388 biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 2389 struct label *semaklabel, size_t accesstype) 2390 { 2391 struct mac_biba *subj, *obj; 2392 2393 if (!biba_enabled) 2394 return (0); 2395 2396 subj = SLOT(cred->cr_label); 2397 obj = SLOT(semaklabel); 2398 2399 if (accesstype & SEM_R) 2400 if (!biba_dominate_effective(obj, subj)) 2401 return (EACCES); 2402 2403 if (accesstype & SEM_A) 2404 if (!biba_dominate_effective(subj, obj)) 2405 return (EACCES); 2406 2407 return (0); 2408 } 2409 2410 static void 2411 biba_sysvsem_cleanup(struct label *semalabel) 2412 { 2413 2414 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 2415 } 2416 2417 static void 2418 biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr, 2419 struct label *semalabel) 2420 { 2421 struct mac_biba *source, *dest; 2422 2423 source = SLOT(cred->cr_label); 2424 dest = SLOT(semalabel); 2425 2426 biba_copy_effective(source, dest); 2427 } 2428 2429 static int 2430 biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 2431 struct label *shmseglabel, int shmflg) 2432 { 2433 struct mac_biba *subj, *obj; 2434 2435 if (!biba_enabled) 2436 return (0); 2437 2438 subj = SLOT(cred->cr_label); 2439 obj = SLOT(shmseglabel); 2440 2441 if (!biba_dominate_effective(obj, subj)) 2442 return (EACCES); 2443 if ((shmflg & SHM_RDONLY) == 0) { 2444 if (!biba_dominate_effective(subj, obj)) 2445 return (EACCES); 2446 } 2447 2448 return (0); 2449 } 2450 2451 static int 2452 biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 2453 struct label *shmseglabel, int cmd) 2454 { 2455 struct mac_biba *subj, *obj; 2456 2457 if (!biba_enabled) 2458 return (0); 2459 2460 subj = SLOT(cred->cr_label); 2461 obj = SLOT(shmseglabel); 2462 2463 switch(cmd) { 2464 case IPC_RMID: 2465 case IPC_SET: 2466 if (!biba_dominate_effective(subj, obj)) 2467 return (EACCES); 2468 break; 2469 2470 case IPC_STAT: 2471 case SHM_STAT: 2472 if (!biba_dominate_effective(obj, subj)) 2473 return (EACCES); 2474 break; 2475 2476 default: 2477 return (EACCES); 2478 } 2479 2480 return (0); 2481 } 2482 2483 static int 2484 biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 2485 struct label *shmseglabel, int shmflg) 2486 { 2487 struct mac_biba *subj, *obj; 2488 2489 if (!biba_enabled) 2490 return (0); 2491 2492 subj = SLOT(cred->cr_label); 2493 obj = SLOT(shmseglabel); 2494 2495 if (!biba_dominate_effective(obj, subj)) 2496 return (EACCES); 2497 2498 return (0); 2499 } 2500 2501 static void 2502 biba_sysvshm_cleanup(struct label *shmlabel) 2503 { 2504 2505 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 2506 } 2507 2508 static void 2509 biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr, 2510 struct label *shmlabel) 2511 { 2512 struct mac_biba *source, *dest; 2513 2514 source = SLOT(cred->cr_label); 2515 dest = SLOT(shmlabel); 2516 2517 biba_copy_effective(source, dest); 2518 } 2519 2520 static int 2521 biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2522 struct vnode *vp, struct label *vplabel) 2523 { 2524 struct mac_biba mb_temp, *source, *dest; 2525 int buflen, error; 2526 2527 source = SLOT(mplabel); 2528 dest = SLOT(vplabel); 2529 2530 buflen = sizeof(mb_temp); 2531 bzero(&mb_temp, buflen); 2532 2533 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 2534 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread); 2535 if (error == ENOATTR || error == EOPNOTSUPP) { 2536 /* Fall back to the mntlabel. */ 2537 biba_copy_effective(source, dest); 2538 return (0); 2539 } else if (error) 2540 return (error); 2541 2542 if (buflen != sizeof(mb_temp)) { 2543 printf("biba_vnode_associate_extattr: bad size %d\n", 2544 buflen); 2545 return (EPERM); 2546 } 2547 if (biba_valid(&mb_temp) != 0) { 2548 printf("biba_vnode_associate_extattr: invalid\n"); 2549 return (EPERM); 2550 } 2551 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != 2552 MAC_BIBA_FLAG_EFFECTIVE) { 2553 printf("biba_vnode_associate_extattr: not effective\n"); 2554 return (EPERM); 2555 } 2556 2557 biba_copy_effective(&mb_temp, dest); 2558 return (0); 2559 } 2560 2561 static void 2562 biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2563 struct vnode *vp, struct label *vplabel) 2564 { 2565 struct mac_biba *source, *dest; 2566 2567 source = SLOT(mplabel); 2568 dest = SLOT(vplabel); 2569 2570 biba_copy_effective(source, dest); 2571 } 2572 2573 static int 2574 biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2575 struct label *dvplabel) 2576 { 2577 struct mac_biba *subj, *obj; 2578 2579 if (!biba_enabled) 2580 return (0); 2581 2582 subj = SLOT(cred->cr_label); 2583 obj = SLOT(dvplabel); 2584 2585 if (!biba_dominate_effective(obj, subj)) 2586 return (EACCES); 2587 2588 return (0); 2589 } 2590 2591 static int 2592 biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2593 struct label *dvplabel) 2594 { 2595 struct mac_biba *subj, *obj; 2596 2597 if (!biba_enabled) 2598 return (0); 2599 2600 subj = SLOT(cred->cr_label); 2601 obj = SLOT(dvplabel); 2602 2603 if (!biba_dominate_effective(obj, subj)) 2604 return (EACCES); 2605 2606 return (0); 2607 } 2608 2609 static int 2610 biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2611 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2612 { 2613 struct mac_biba *subj, *obj; 2614 2615 if (!biba_enabled) 2616 return (0); 2617 2618 subj = SLOT(cred->cr_label); 2619 obj = SLOT(dvplabel); 2620 2621 if (!biba_dominate_effective(subj, obj)) 2622 return (EACCES); 2623 2624 return (0); 2625 } 2626 2627 static int 2628 biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2629 struct label *vplabel, acl_type_t type) 2630 { 2631 struct mac_biba *subj, *obj; 2632 2633 if (!biba_enabled) 2634 return (0); 2635 2636 subj = SLOT(cred->cr_label); 2637 obj = SLOT(vplabel); 2638 2639 if (!biba_dominate_effective(subj, obj)) 2640 return (EACCES); 2641 2642 return (0); 2643 } 2644 2645 static int 2646 biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2647 struct label *vplabel, int attrnamespace, const char *name) 2648 { 2649 struct mac_biba *subj, *obj; 2650 2651 if (!biba_enabled) 2652 return (0); 2653 2654 subj = SLOT(cred->cr_label); 2655 obj = SLOT(vplabel); 2656 2657 if (!biba_dominate_effective(subj, obj)) 2658 return (EACCES); 2659 2660 return (0); 2661 } 2662 2663 static int 2664 biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2665 struct label *vplabel, struct image_params *imgp, 2666 struct label *execlabel) 2667 { 2668 struct mac_biba *subj, *obj, *exec; 2669 int error; 2670 2671 if (execlabel != NULL) { 2672 /* 2673 * We currently don't permit labels to be changed at 2674 * exec-time as part of Biba, so disallow non-NULL Biba label 2675 * elements in the execlabel. 2676 */ 2677 exec = SLOT(execlabel); 2678 error = biba_atmostflags(exec, 0); 2679 if (error) 2680 return (error); 2681 } 2682 2683 if (!biba_enabled) 2684 return (0); 2685 2686 subj = SLOT(cred->cr_label); 2687 obj = SLOT(vplabel); 2688 2689 if (!biba_dominate_effective(obj, subj)) 2690 return (EACCES); 2691 2692 return (0); 2693 } 2694 2695 static int 2696 biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2697 struct label *vplabel, acl_type_t type) 2698 { 2699 struct mac_biba *subj, *obj; 2700 2701 if (!biba_enabled) 2702 return (0); 2703 2704 subj = SLOT(cred->cr_label); 2705 obj = SLOT(vplabel); 2706 2707 if (!biba_dominate_effective(obj, subj)) 2708 return (EACCES); 2709 2710 return (0); 2711 } 2712 2713 static int 2714 biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2715 struct label *vplabel, int attrnamespace, const char *name, 2716 struct uio *uio) 2717 { 2718 struct mac_biba *subj, *obj; 2719 2720 if (!biba_enabled) 2721 return (0); 2722 2723 subj = SLOT(cred->cr_label); 2724 obj = SLOT(vplabel); 2725 2726 if (!biba_dominate_effective(obj, subj)) 2727 return (EACCES); 2728 2729 return (0); 2730 } 2731 2732 static int 2733 biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2734 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2735 struct componentname *cnp) 2736 { 2737 struct mac_biba *subj, *obj; 2738 2739 if (!biba_enabled) 2740 return (0); 2741 2742 subj = SLOT(cred->cr_label); 2743 obj = SLOT(dvplabel); 2744 2745 if (!biba_dominate_effective(subj, obj)) 2746 return (EACCES); 2747 2748 obj = SLOT(vplabel); 2749 2750 if (!biba_dominate_effective(subj, obj)) 2751 return (EACCES); 2752 2753 return (0); 2754 } 2755 2756 static int 2757 biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2758 struct label *vplabel, int attrnamespace) 2759 { 2760 struct mac_biba *subj, *obj; 2761 2762 if (!biba_enabled) 2763 return (0); 2764 2765 subj = SLOT(cred->cr_label); 2766 obj = SLOT(vplabel); 2767 2768 if (!biba_dominate_effective(obj, subj)) 2769 return (EACCES); 2770 2771 return (0); 2772 } 2773 2774 static int 2775 biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2776 struct label *dvplabel, struct componentname *cnp) 2777 { 2778 struct mac_biba *subj, *obj; 2779 2780 if (!biba_enabled) 2781 return (0); 2782 2783 subj = SLOT(cred->cr_label); 2784 obj = SLOT(dvplabel); 2785 2786 if (!biba_dominate_effective(obj, subj)) 2787 return (EACCES); 2788 2789 return (0); 2790 } 2791 2792 static int 2793 biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2794 struct label *vplabel, int prot, int flags) 2795 { 2796 struct mac_biba *subj, *obj; 2797 2798 /* 2799 * Rely on the use of open()-time protections to handle 2800 * non-revocation cases. 2801 */ 2802 if (!biba_enabled || !revocation_enabled) 2803 return (0); 2804 2805 subj = SLOT(cred->cr_label); 2806 obj = SLOT(vplabel); 2807 2808 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2809 if (!biba_dominate_effective(obj, subj)) 2810 return (EACCES); 2811 } 2812 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2813 if (!biba_dominate_effective(subj, obj)) 2814 return (EACCES); 2815 } 2816 2817 return (0); 2818 } 2819 2820 static int 2821 biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2822 struct label *vplabel, int acc_mode) 2823 { 2824 struct mac_biba *subj, *obj; 2825 2826 if (!biba_enabled) 2827 return (0); 2828 2829 subj = SLOT(cred->cr_label); 2830 obj = SLOT(vplabel); 2831 2832 /* XXX privilege override for admin? */ 2833 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2834 if (!biba_dominate_effective(obj, subj)) 2835 return (EACCES); 2836 } 2837 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2838 if (!biba_dominate_effective(subj, obj)) 2839 return (EACCES); 2840 } 2841 2842 return (0); 2843 } 2844 2845 static int 2846 biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2847 struct vnode *vp, struct label *vplabel) 2848 { 2849 struct mac_biba *subj, *obj; 2850 2851 if (!biba_enabled || !revocation_enabled) 2852 return (0); 2853 2854 subj = SLOT(active_cred->cr_label); 2855 obj = SLOT(vplabel); 2856 2857 if (!biba_dominate_effective(obj, subj)) 2858 return (EACCES); 2859 2860 return (0); 2861 } 2862 2863 static int 2864 biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2865 struct vnode *vp, struct label *vplabel) 2866 { 2867 struct mac_biba *subj, *obj; 2868 2869 if (!biba_enabled || !revocation_enabled) 2870 return (0); 2871 2872 subj = SLOT(active_cred->cr_label); 2873 obj = SLOT(vplabel); 2874 2875 if (!biba_dominate_effective(obj, subj)) 2876 return (EACCES); 2877 2878 return (0); 2879 } 2880 2881 static int 2882 biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2883 struct label *dvplabel) 2884 { 2885 struct mac_biba *subj, *obj; 2886 2887 if (!biba_enabled) 2888 return (0); 2889 2890 subj = SLOT(cred->cr_label); 2891 obj = SLOT(dvplabel); 2892 2893 if (!biba_dominate_effective(obj, subj)) 2894 return (EACCES); 2895 2896 return (0); 2897 } 2898 2899 static int 2900 biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2901 struct label *vplabel) 2902 { 2903 struct mac_biba *subj, *obj; 2904 2905 if (!biba_enabled) 2906 return (0); 2907 2908 subj = SLOT(cred->cr_label); 2909 obj = SLOT(vplabel); 2910 2911 if (!biba_dominate_effective(obj, subj)) 2912 return (EACCES); 2913 2914 return (0); 2915 } 2916 2917 static int 2918 biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2919 struct label *vplabel, struct label *newlabel) 2920 { 2921 struct mac_biba *old, *new, *subj; 2922 int error; 2923 2924 old = SLOT(vplabel); 2925 new = SLOT(newlabel); 2926 subj = SLOT(cred->cr_label); 2927 2928 /* 2929 * If there is a Biba label update for the vnode, it must be a 2930 * effective label. 2931 */ 2932 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2933 if (error) 2934 return (error); 2935 2936 /* 2937 * To perform a relabel of the vnode (Biba label or not), Biba must 2938 * authorize the relabel. 2939 */ 2940 if (!biba_effective_in_range(old, subj)) 2941 return (EPERM); 2942 2943 /* 2944 * If the Biba label is to be changed, authorize as appropriate. 2945 */ 2946 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2947 /* 2948 * To change the Biba label on a vnode, the new vnode label 2949 * must be in the subject range. 2950 */ 2951 if (!biba_effective_in_range(new, subj)) 2952 return (EPERM); 2953 2954 /* 2955 * To change the Biba label on the vnode to be EQUAL, the 2956 * subject must have appropriate privilege. 2957 */ 2958 if (biba_contains_equal(new)) { 2959 error = biba_subject_privileged(subj); 2960 if (error) 2961 return (error); 2962 } 2963 } 2964 2965 return (0); 2966 } 2967 2968 static int 2969 biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 2970 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2971 struct componentname *cnp) 2972 { 2973 struct mac_biba *subj, *obj; 2974 2975 if (!biba_enabled) 2976 return (0); 2977 2978 subj = SLOT(cred->cr_label); 2979 obj = SLOT(dvplabel); 2980 2981 if (!biba_dominate_effective(subj, obj)) 2982 return (EACCES); 2983 2984 obj = SLOT(vplabel); 2985 2986 if (!biba_dominate_effective(subj, obj)) 2987 return (EACCES); 2988 2989 return (0); 2990 } 2991 2992 static int 2993 biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 2994 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2995 int samedir, struct componentname *cnp) 2996 { 2997 struct mac_biba *subj, *obj; 2998 2999 if (!biba_enabled) 3000 return (0); 3001 3002 subj = SLOT(cred->cr_label); 3003 obj = SLOT(dvplabel); 3004 3005 if (!biba_dominate_effective(subj, obj)) 3006 return (EACCES); 3007 3008 if (vp != NULL) { 3009 obj = SLOT(vplabel); 3010 3011 if (!biba_dominate_effective(subj, obj)) 3012 return (EACCES); 3013 } 3014 3015 return (0); 3016 } 3017 3018 static int 3019 biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3020 struct label *vplabel) 3021 { 3022 struct mac_biba *subj, *obj; 3023 3024 if (!biba_enabled) 3025 return (0); 3026 3027 subj = SLOT(cred->cr_label); 3028 obj = SLOT(vplabel); 3029 3030 if (!biba_dominate_effective(subj, obj)) 3031 return (EACCES); 3032 3033 return (0); 3034 } 3035 3036 static int 3037 biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 3038 struct label *vplabel, acl_type_t type, struct acl *acl) 3039 { 3040 struct mac_biba *subj, *obj; 3041 3042 if (!biba_enabled) 3043 return (0); 3044 3045 subj = SLOT(cred->cr_label); 3046 obj = SLOT(vplabel); 3047 3048 if (!biba_dominate_effective(subj, obj)) 3049 return (EACCES); 3050 3051 return (0); 3052 } 3053 3054 static int 3055 biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3056 struct label *vplabel, int attrnamespace, const char *name, 3057 struct uio *uio) 3058 { 3059 struct mac_biba *subj, *obj; 3060 3061 if (!biba_enabled) 3062 return (0); 3063 3064 subj = SLOT(cred->cr_label); 3065 obj = SLOT(vplabel); 3066 3067 if (!biba_dominate_effective(subj, obj)) 3068 return (EACCES); 3069 3070 /* XXX: protect the MAC EA in a special way? */ 3071 3072 return (0); 3073 } 3074 3075 static int 3076 biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3077 struct label *vplabel, u_long flags) 3078 { 3079 struct mac_biba *subj, *obj; 3080 3081 if (!biba_enabled) 3082 return (0); 3083 3084 subj = SLOT(cred->cr_label); 3085 obj = SLOT(vplabel); 3086 3087 if (!biba_dominate_effective(subj, obj)) 3088 return (EACCES); 3089 3090 return (0); 3091 } 3092 3093 static int 3094 biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3095 struct label *vplabel, mode_t mode) 3096 { 3097 struct mac_biba *subj, *obj; 3098 3099 if (!biba_enabled) 3100 return (0); 3101 3102 subj = SLOT(cred->cr_label); 3103 obj = SLOT(vplabel); 3104 3105 if (!biba_dominate_effective(subj, obj)) 3106 return (EACCES); 3107 3108 return (0); 3109 } 3110 3111 static int 3112 biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3113 struct label *vplabel, uid_t uid, gid_t gid) 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_setutimes(struct ucred *cred, struct vnode *vp, 3131 struct label *vplabel, struct timespec atime, struct timespec mtime) 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_stat(struct ucred *active_cred, struct ucred *file_cred, 3149 struct vnode *vp, struct label *vplabel) 3150 { 3151 struct mac_biba *subj, *obj; 3152 3153 if (!biba_enabled) 3154 return (0); 3155 3156 subj = SLOT(active_cred->cr_label); 3157 obj = SLOT(vplabel); 3158 3159 if (!biba_dominate_effective(obj, subj)) 3160 return (EACCES); 3161 3162 return (0); 3163 } 3164 3165 static int 3166 biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3167 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3168 struct componentname *cnp) 3169 { 3170 struct mac_biba *subj, *obj; 3171 3172 if (!biba_enabled) 3173 return (0); 3174 3175 subj = SLOT(cred->cr_label); 3176 obj = SLOT(dvplabel); 3177 3178 if (!biba_dominate_effective(subj, obj)) 3179 return (EACCES); 3180 3181 obj = SLOT(vplabel); 3182 3183 if (!biba_dominate_effective(subj, obj)) 3184 return (EACCES); 3185 3186 return (0); 3187 } 3188 3189 static int 3190 biba_vnode_check_write(struct ucred *active_cred, 3191 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3192 { 3193 struct mac_biba *subj, *obj; 3194 3195 if (!biba_enabled || !revocation_enabled) 3196 return (0); 3197 3198 subj = SLOT(active_cred->cr_label); 3199 obj = SLOT(vplabel); 3200 3201 if (!biba_dominate_effective(subj, obj)) 3202 return (EACCES); 3203 3204 return (0); 3205 } 3206 3207 static int 3208 biba_vnode_create_extattr(struct ucred *cred, struct mount *mp, 3209 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 3210 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 3211 { 3212 struct mac_biba *source, *dest, mb_temp; 3213 size_t buflen; 3214 int error; 3215 3216 buflen = sizeof(mb_temp); 3217 bzero(&mb_temp, buflen); 3218 3219 source = SLOT(cred->cr_label); 3220 dest = SLOT(vplabel); 3221 biba_copy_effective(source, &mb_temp); 3222 3223 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3224 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3225 if (error == 0) 3226 biba_copy_effective(source, dest); 3227 return (error); 3228 } 3229 3230 static void 3231 biba_vnode_relabel(struct ucred *cred, struct vnode *vp, 3232 struct label *vplabel, struct label *newlabel) 3233 { 3234 struct mac_biba *source, *dest; 3235 3236 source = SLOT(newlabel); 3237 dest = SLOT(vplabel); 3238 3239 biba_copy(source, dest); 3240 } 3241 3242 static int 3243 biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 3244 struct label *vplabel, struct label *intlabel) 3245 { 3246 struct mac_biba *source, mb_temp; 3247 size_t buflen; 3248 int error; 3249 3250 buflen = sizeof(mb_temp); 3251 bzero(&mb_temp, buflen); 3252 3253 source = SLOT(intlabel); 3254 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0) 3255 return (0); 3256 3257 biba_copy_effective(source, &mb_temp); 3258 3259 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3260 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3261 return (error); 3262 } 3263 3264 static struct mac_policy_ops mac_biba_ops = 3265 { 3266 .mpo_init = biba_init, 3267 3268 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3269 .mpo_bpfdesc_create = biba_bpfdesc_create, 3270 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, 3271 .mpo_bpfdesc_destroy_label = biba_destroy_label, 3272 .mpo_bpfdesc_init_label = biba_init_label, 3273 3274 .mpo_cred_check_relabel = biba_cred_check_relabel, 3275 .mpo_cred_check_visible = biba_cred_check_visible, 3276 .mpo_cred_copy_label = biba_copy_label, 3277 .mpo_cred_destroy_label = biba_destroy_label, 3278 .mpo_cred_externalize_label = biba_externalize_label, 3279 .mpo_cred_init_label = biba_init_label, 3280 .mpo_cred_internalize_label = biba_internalize_label, 3281 .mpo_cred_relabel = biba_cred_relabel, 3282 3283 .mpo_devfs_create_device = biba_devfs_create_device, 3284 .mpo_devfs_create_directory = biba_devfs_create_directory, 3285 .mpo_devfs_create_symlink = biba_devfs_create_symlink, 3286 .mpo_devfs_destroy_label = biba_destroy_label, 3287 .mpo_devfs_init_label = biba_init_label, 3288 .mpo_devfs_update = biba_devfs_update, 3289 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, 3290 3291 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3292 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3293 .mpo_ifnet_copy_label = biba_copy_label, 3294 .mpo_ifnet_create = biba_ifnet_create, 3295 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, 3296 .mpo_ifnet_destroy_label = biba_destroy_label, 3297 .mpo_ifnet_externalize_label = biba_externalize_label, 3298 .mpo_ifnet_init_label = biba_init_label, 3299 .mpo_ifnet_internalize_label = biba_internalize_label, 3300 .mpo_ifnet_relabel = biba_ifnet_relabel, 3301 3302 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3303 .mpo_inpcb_create = biba_inpcb_create, 3304 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, 3305 .mpo_inpcb_destroy_label = biba_destroy_label, 3306 .mpo_inpcb_init_label = biba_init_label_waitcheck, 3307 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, 3308 3309 .mpo_ipq_create = biba_ipq_create, 3310 .mpo_ipq_destroy_label = biba_destroy_label, 3311 .mpo_ipq_init_label = biba_init_label_waitcheck, 3312 .mpo_ipq_match = biba_ipq_match, 3313 .mpo_ipq_reassemble = biba_ipq_reassemble, 3314 .mpo_ipq_update = biba_ipq_update, 3315 3316 .mpo_kld_check_load = biba_kld_check_load, 3317 3318 .mpo_mbuf_copy_label = biba_copy_label, 3319 .mpo_mbuf_destroy_label = biba_destroy_label, 3320 .mpo_mbuf_init_label = biba_init_label_waitcheck, 3321 3322 .mpo_mount_check_stat = biba_mount_check_stat, 3323 .mpo_mount_create = biba_mount_create, 3324 .mpo_mount_destroy_label = biba_destroy_label, 3325 .mpo_mount_init_label = biba_init_label, 3326 3327 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send, 3328 3329 .mpo_netinet_arp_send = biba_netinet_arp_send, 3330 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply, 3331 .mpo_netinet_firewall_send = biba_netinet_firewall_send, 3332 .mpo_netinet_fragment = biba_netinet_fragment, 3333 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply, 3334 .mpo_netinet_igmp_send = biba_netinet_igmp_send, 3335 3336 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send, 3337 3338 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3339 .mpo_pipe_check_poll = biba_pipe_check_poll, 3340 .mpo_pipe_check_read = biba_pipe_check_read, 3341 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3342 .mpo_pipe_check_stat = biba_pipe_check_stat, 3343 .mpo_pipe_check_write = biba_pipe_check_write, 3344 .mpo_pipe_copy_label = biba_copy_label, 3345 .mpo_pipe_create = biba_pipe_create, 3346 .mpo_pipe_destroy_label = biba_destroy_label, 3347 .mpo_pipe_externalize_label = biba_externalize_label, 3348 .mpo_pipe_init_label = biba_init_label, 3349 .mpo_pipe_internalize_label = biba_internalize_label, 3350 .mpo_pipe_relabel = biba_pipe_relabel, 3351 3352 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3353 .mpo_posixsem_check_open = biba_posixsem_check_openunlink, 3354 .mpo_posixsem_check_post = biba_posixsem_check_write, 3355 .mpo_posixsem_check_stat = biba_posixsem_check_rdonly, 3356 .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink, 3357 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3358 .mpo_posixsem_create = biba_posixsem_create, 3359 .mpo_posixsem_destroy_label = biba_destroy_label, 3360 .mpo_posixsem_init_label = biba_init_label, 3361 3362 .mpo_priv_check = biba_priv_check, 3363 3364 .mpo_proc_associate_nfsd = biba_proc_associate_nfsd, 3365 .mpo_proc_check_debug = biba_proc_check_debug, 3366 .mpo_proc_check_sched = biba_proc_check_sched, 3367 .mpo_proc_check_signal = biba_proc_check_signal, 3368 .mpo_proc_create_init = biba_proc_create_init, 3369 .mpo_proc_create_swapper = biba_proc_create_swapper, 3370 3371 .mpo_socket_check_deliver = biba_socket_check_deliver, 3372 .mpo_socket_check_relabel = biba_socket_check_relabel, 3373 .mpo_socket_check_visible = biba_socket_check_visible, 3374 .mpo_socket_copy_label = biba_copy_label, 3375 .mpo_socket_create = biba_socket_create, 3376 .mpo_socket_create_mbuf = biba_socket_create_mbuf, 3377 .mpo_socket_destroy_label = biba_destroy_label, 3378 .mpo_socket_externalize_label = biba_externalize_label, 3379 .mpo_socket_init_label = biba_init_label_waitcheck, 3380 .mpo_socket_internalize_label = biba_internalize_label, 3381 .mpo_socket_newconn = biba_socket_newconn, 3382 .mpo_socket_relabel = biba_socket_relabel, 3383 3384 .mpo_socketpeer_destroy_label = biba_destroy_label, 3385 .mpo_socketpeer_externalize_label = biba_externalize_label, 3386 .mpo_socketpeer_init_label = biba_init_label_waitcheck, 3387 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, 3388 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, 3389 3390 .mpo_syncache_create = biba_syncache_create, 3391 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf, 3392 .mpo_syncache_destroy_label = biba_destroy_label, 3393 .mpo_syncache_init_label = biba_init_label_waitcheck, 3394 3395 .mpo_system_check_acct = biba_system_check_acct, 3396 .mpo_system_check_auditctl = biba_system_check_auditctl, 3397 .mpo_system_check_auditon = biba_system_check_auditon, 3398 .mpo_system_check_swapoff = biba_system_check_swapoff, 3399 .mpo_system_check_swapon = biba_system_check_swapon, 3400 .mpo_system_check_sysctl = biba_system_check_sysctl, 3401 3402 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3403 .mpo_sysvmsg_create = biba_sysvmsg_create, 3404 .mpo_sysvmsg_destroy_label = biba_destroy_label, 3405 .mpo_sysvmsg_init_label = biba_init_label, 3406 3407 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3408 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3409 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3410 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3411 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3412 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3413 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3414 .mpo_sysvmsq_create = biba_sysvmsq_create, 3415 .mpo_sysvmsq_destroy_label = biba_destroy_label, 3416 .mpo_sysvmsq_init_label = biba_init_label, 3417 3418 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3419 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3420 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3421 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3422 .mpo_sysvsem_create = biba_sysvsem_create, 3423 .mpo_sysvsem_destroy_label = biba_destroy_label, 3424 .mpo_sysvsem_init_label = biba_init_label, 3425 3426 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3427 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3428 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3429 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3430 .mpo_sysvshm_create = biba_sysvshm_create, 3431 .mpo_sysvshm_destroy_label = biba_destroy_label, 3432 .mpo_sysvshm_init_label = biba_init_label, 3433 3434 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, 3435 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, 3436 .mpo_vnode_check_access = biba_vnode_check_open, 3437 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3438 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3439 .mpo_vnode_check_create = biba_vnode_check_create, 3440 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3441 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3442 .mpo_vnode_check_exec = biba_vnode_check_exec, 3443 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3444 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3445 .mpo_vnode_check_link = biba_vnode_check_link, 3446 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3447 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3448 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3449 .mpo_vnode_check_open = biba_vnode_check_open, 3450 .mpo_vnode_check_poll = biba_vnode_check_poll, 3451 .mpo_vnode_check_read = biba_vnode_check_read, 3452 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3453 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3454 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3455 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3456 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3457 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3458 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3459 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3460 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3461 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3462 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3463 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3464 .mpo_vnode_check_stat = biba_vnode_check_stat, 3465 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3466 .mpo_vnode_check_write = biba_vnode_check_write, 3467 .mpo_vnode_create_extattr = biba_vnode_create_extattr, 3468 .mpo_vnode_copy_label = biba_copy_label, 3469 .mpo_vnode_destroy_label = biba_destroy_label, 3470 .mpo_vnode_externalize_label = biba_externalize_label, 3471 .mpo_vnode_init_label = biba_init_label, 3472 .mpo_vnode_internalize_label = biba_internalize_label, 3473 .mpo_vnode_relabel = biba_vnode_relabel, 3474 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, 3475 }; 3476 3477 MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3478 MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &biba_slot); 3479