mac_biba.c revision 173108
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: head/sys/security/mac_biba/mac_biba.c 173108 2007-10-28 17:55:57Z rwatson $ 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 90SYSCTL_DECL(_security_mac); 91 92SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0, 93 "TrustedBSD mac_biba policy controls"); 94 95static int biba_label_size = sizeof(struct mac_biba); 96SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD, 97 &biba_label_size, 0, "Size of struct mac_biba"); 98 99static int biba_enabled = 1; 100SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, &biba_enabled, 101 0, "Enforce MAC/Biba policy"); 102TUNABLE_INT("security.mac.biba.enabled", &biba_enabled); 103 104static int destroyed_not_inited; 105SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 106 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 107 108static int trust_all_interfaces = 0; 109SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, 110 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); 111TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces); 112 113static char trusted_interfaces[128]; 114SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD, 115 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); 116TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces, 117 sizeof(trusted_interfaces)); 118 119static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS; 120SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD, 121 &max_compartments, 0, "Maximum supported compartments"); 122 123static int ptys_equal = 0; 124SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, 125 &ptys_equal, 0, "Label pty devices as biba/equal on create"); 126TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal); 127 128static int interfaces_equal; 129SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RW, 130 &interfaces_equal, 0, "Label network interfaces as biba/equal on create"); 131TUNABLE_INT("security.mac.biba.interfaces_equal", &interfaces_equal); 132 133static int revocation_enabled = 0; 134SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW, 135 &revocation_enabled, 0, "Revoke access to objects on relabel"); 136TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled); 137 138static 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 142static uma_zone_t zone_biba; 143 144static __inline int 145biba_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 154static struct mac_biba * 155biba_alloc(int flag) 156{ 157 158 return (uma_zalloc(zone_biba, flag | M_ZERO)); 159} 160 161static void 162biba_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 171static int 172biba_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 180static int 181biba_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 232static int 233biba_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 245static int 246biba_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 255static int 256biba_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 272static int 273biba_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 283static int 284biba_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 294static int 295biba_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 306static int 307biba_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 325static int 326biba_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 350static int 351biba_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 360static int 361biba_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 432static void 433biba_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 451static void 452biba_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 464static void 465biba_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 476static void 477biba_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 487static void 488biba_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 */ 500static void 501biba_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 */ 511static void 512biba_init_label(struct label *label) 513{ 514 515 SLOT_SET(label, biba_alloc(M_WAITOK)); 516} 517 518static int 519biba_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 529static void 530biba_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 */ 542static int 543biba_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 */ 591static int 592biba_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 620static int 621biba_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 635static int 636biba_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 || 642 strcmp(string, "hi") == 0) { 643 element->mbe_type = MAC_BIBA_TYPE_HIGH; 644 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 645 } else if (strcmp(string, "low") == 0 || 646 strcmp(string, "lo") == 0) { 647 element->mbe_type = MAC_BIBA_TYPE_LOW; 648 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 649 } else if (strcmp(string, "equal") == 0 || 650 strcmp(string, "eq") == 0) { 651 element->mbe_type = MAC_BIBA_TYPE_EQUAL; 652 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 653 } else { 654 element->mbe_type = MAC_BIBA_TYPE_GRADE; 655 656 /* 657 * Numeric grade piece of the element. 658 */ 659 grade = strsep(&string, ":"); 660 value = strtol(grade, &end, 10); 661 if (end == grade || *end != '\0') 662 return (EINVAL); 663 if (value < 0 || value > 65535) 664 return (EINVAL); 665 element->mbe_grade = value; 666 667 /* 668 * Optional compartment piece of the element. If none 669 * are included, we assume that the label has no 670 * compartments. 671 */ 672 if (string == NULL) 673 return (0); 674 if (*string == '\0') 675 return (0); 676 677 while ((compartment = strsep(&string, "+")) != NULL) { 678 value = strtol(compartment, &end, 10); 679 if (compartment == end || *end != '\0') 680 return (EINVAL); 681 if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS) 682 return (EINVAL); 683 MAC_BIBA_BIT_SET(value, element->mbe_compartments); 684 } 685 } 686 687 return (0); 688} 689 690/* 691 * Note: destructively consumes the string, make a local copy before 692 * calling if that's a problem. 693 */ 694static int 695biba_parse(struct mac_biba *mb, char *string) 696{ 697 char *rangehigh, *rangelow, *effective; 698 int error; 699 700 effective = strsep(&string, "("); 701 if (*effective == '\0') 702 effective = NULL; 703 704 if (string != NULL) { 705 rangelow = strsep(&string, "-"); 706 if (string == NULL) 707 return (EINVAL); 708 rangehigh = strsep(&string, ")"); 709 if (string == NULL) 710 return (EINVAL); 711 if (*string != '\0') 712 return (EINVAL); 713 } else { 714 rangelow = NULL; 715 rangehigh = NULL; 716 } 717 718 KASSERT((rangelow != NULL && rangehigh != NULL) || 719 (rangelow == NULL && rangehigh == NULL), 720 ("biba_parse: range mismatch")); 721 722 bzero(mb, sizeof(*mb)); 723 if (effective != NULL) { 724 error = biba_parse_element(&mb->mb_effective, effective); 725 if (error) 726 return (error); 727 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; 728 } 729 730 if (rangelow != NULL) { 731 error = biba_parse_element(&mb->mb_rangelow, rangelow); 732 if (error) 733 return (error); 734 error = biba_parse_element(&mb->mb_rangehigh, rangehigh); 735 if (error) 736 return (error); 737 mb->mb_flags |= MAC_BIBA_FLAG_RANGE; 738 } 739 740 error = biba_valid(mb); 741 if (error) 742 return (error); 743 744 return (0); 745} 746 747static int 748biba_internalize_label(struct label *label, char *element_name, 749 char *element_data, int *claimed) 750{ 751 struct mac_biba *mb, mb_temp; 752 int error; 753 754 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 755 return (0); 756 757 (*claimed)++; 758 759 error = biba_parse(&mb_temp, element_data); 760 if (error) 761 return (error); 762 763 mb = SLOT(label); 764 *mb = mb_temp; 765 766 return (0); 767} 768 769static void 770biba_copy_label(struct label *src, struct label *dest) 771{ 772 773 *SLOT(dest) = *SLOT(src); 774} 775 776/* 777 * Labeling event operations: file system objects, and things that look a lot 778 * like file system objects. 779 */ 780static void 781biba_devfs_create_device(struct ucred *cred, struct mount *mp, 782 struct cdev *dev, struct devfs_dirent *de, struct label *delabel) 783{ 784 struct mac_biba *mb; 785 int biba_type; 786 787 mb = SLOT(delabel); 788 if (strcmp(dev->si_name, "null") == 0 || 789 strcmp(dev->si_name, "zero") == 0 || 790 strcmp(dev->si_name, "random") == 0 || 791 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 792 biba_type = MAC_BIBA_TYPE_EQUAL; 793 else if (ptys_equal && 794 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 795 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 796 biba_type = MAC_BIBA_TYPE_EQUAL; 797 else 798 biba_type = MAC_BIBA_TYPE_HIGH; 799 biba_set_effective(mb, biba_type, 0, NULL); 800} 801 802static void 803biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 804 struct devfs_dirent *de, struct label *delabel) 805{ 806 struct mac_biba *mb; 807 808 mb = SLOT(delabel); 809 810 biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL); 811} 812 813static void 814biba_devfs_create_symlink(struct ucred *cred, struct mount *mp, 815 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 816 struct label *delabel) 817{ 818 struct mac_biba *source, *dest; 819 820 source = SLOT(cred->cr_label); 821 dest = SLOT(delabel); 822 823 biba_copy_effective(source, dest); 824} 825 826static void 827biba_mount_create(struct ucred *cred, struct mount *mp, 828 struct label *mplabel) 829{ 830 struct mac_biba *source, *dest; 831 832 source = SLOT(cred->cr_label); 833 dest = SLOT(mplabel); 834 835 biba_copy_effective(source, dest); 836} 837 838static void 839biba_vnode_relabel(struct ucred *cred, struct vnode *vp, 840 struct label *vplabel, struct label *newlabel) 841{ 842 struct mac_biba *source, *dest; 843 844 source = SLOT(newlabel); 845 dest = SLOT(vplabel); 846 847 biba_copy(source, dest); 848} 849 850static void 851biba_devfs_update(struct mount *mp, struct devfs_dirent *de, 852 struct label *delabel, struct vnode *vp, struct label *vplabel) 853{ 854 struct mac_biba *source, *dest; 855 856 source = SLOT(vplabel); 857 dest = SLOT(delabel); 858 859 biba_copy(source, dest); 860} 861 862static void 863biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel, 864 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 865 struct label *vplabel) 866{ 867 struct mac_biba *source, *dest; 868 869 source = SLOT(delabel); 870 dest = SLOT(vplabel); 871 872 biba_copy_effective(source, dest); 873} 874 875static int 876biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 877 struct vnode *vp, struct label *vplabel) 878{ 879 struct mac_biba mb_temp, *source, *dest; 880 int buflen, error; 881 882 source = SLOT(mplabel); 883 dest = SLOT(vplabel); 884 885 buflen = sizeof(mb_temp); 886 bzero(&mb_temp, buflen); 887 888 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 889 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread); 890 if (error == ENOATTR || error == EOPNOTSUPP) { 891 /* Fall back to the mntlabel. */ 892 biba_copy_effective(source, dest); 893 return (0); 894 } else if (error) 895 return (error); 896 897 if (buflen != sizeof(mb_temp)) { 898 printf("biba_vnode_associate_extattr: bad size %d\n", 899 buflen); 900 return (EPERM); 901 } 902 if (biba_valid(&mb_temp) != 0) { 903 printf("biba_vnode_associate_extattr: invalid\n"); 904 return (EPERM); 905 } 906 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != 907 MAC_BIBA_FLAG_EFFECTIVE) { 908 printf("biba_vnode_associate_extattr: not effective\n"); 909 return (EPERM); 910 } 911 912 biba_copy_effective(&mb_temp, dest); 913 return (0); 914} 915 916static void 917biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 918 struct vnode *vp, struct label *vplabel) 919{ 920 struct mac_biba *source, *dest; 921 922 source = SLOT(mplabel); 923 dest = SLOT(vplabel); 924 925 biba_copy_effective(source, dest); 926} 927 928static int 929biba_vnode_create_extattr(struct ucred *cred, struct mount *mp, 930 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 931 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 932{ 933 struct mac_biba *source, *dest, mb_temp; 934 size_t buflen; 935 int error; 936 937 buflen = sizeof(mb_temp); 938 bzero(&mb_temp, buflen); 939 940 source = SLOT(cred->cr_label); 941 dest = SLOT(vplabel); 942 biba_copy_effective(source, &mb_temp); 943 944 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 945 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 946 if (error == 0) 947 biba_copy_effective(source, dest); 948 return (error); 949} 950 951static int 952biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 953 struct label *vplabel, struct label *intlabel) 954{ 955 struct mac_biba *source, mb_temp; 956 size_t buflen; 957 int error; 958 959 buflen = sizeof(mb_temp); 960 bzero(&mb_temp, buflen); 961 962 source = SLOT(intlabel); 963 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0) 964 return (0); 965 966 biba_copy_effective(source, &mb_temp); 967 968 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 969 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 970 return (error); 971} 972 973/* 974 * Labeling event operations: IPC object. 975 */ 976static void 977biba_inpcb_create(struct socket *so, struct label *solabel, 978 struct inpcb *inp, struct label *inplabel) 979{ 980 struct mac_biba *source, *dest; 981 982 source = SLOT(solabel); 983 dest = SLOT(inplabel); 984 985 biba_copy_effective(source, dest); 986} 987 988static void 989biba_socket_create_mbuf(struct socket *so, struct label *solabel, 990 struct mbuf *m, struct label *mlabel) 991{ 992 struct mac_biba *source, *dest; 993 994 source = SLOT(solabel); 995 dest = SLOT(mlabel); 996 997 biba_copy_effective(source, dest); 998} 999 1000static void 1001biba_socket_create(struct ucred *cred, struct socket *so, 1002 struct label *solabel) 1003{ 1004 struct mac_biba *source, *dest; 1005 1006 source = SLOT(cred->cr_label); 1007 dest = SLOT(solabel); 1008 1009 biba_copy_effective(source, dest); 1010} 1011 1012static void 1013biba_pipe_create(struct ucred *cred, struct pipepair *pp, 1014 struct label *pplabel) 1015{ 1016 struct mac_biba *source, *dest; 1017 1018 source = SLOT(cred->cr_label); 1019 dest = SLOT(pplabel); 1020 1021 biba_copy_effective(source, dest); 1022} 1023 1024static void 1025biba_posixsem_create(struct ucred *cred, struct ksem *ks, 1026 struct label *kslabel) 1027{ 1028 struct mac_biba *source, *dest; 1029 1030 source = SLOT(cred->cr_label); 1031 dest = SLOT(kslabel); 1032 1033 biba_copy_effective(source, dest); 1034} 1035 1036static void 1037biba_socket_newconn(struct socket *oldso, struct label *oldsolabel, 1038 struct socket *newso, struct label *newsolabel) 1039{ 1040 struct mac_biba *source, *dest; 1041 1042 source = SLOT(oldsolabel); 1043 dest = SLOT(newsolabel); 1044 1045 biba_copy_effective(source, dest); 1046} 1047 1048static void 1049biba_socket_relabel(struct ucred *cred, struct socket *so, 1050 struct label *solabel, struct label *newlabel) 1051{ 1052 struct mac_biba *source, *dest; 1053 1054 source = SLOT(newlabel); 1055 dest = SLOT(solabel); 1056 1057 biba_copy(source, dest); 1058} 1059 1060static void 1061biba_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1062 struct label *pplabel, struct label *newlabel) 1063{ 1064 struct mac_biba *source, *dest; 1065 1066 source = SLOT(newlabel); 1067 dest = SLOT(pplabel); 1068 1069 biba_copy(source, dest); 1070} 1071 1072static void 1073biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 1074 struct socket *so, struct label *sopeerlabel) 1075{ 1076 struct mac_biba *source, *dest; 1077 1078 source = SLOT(mlabel); 1079 dest = SLOT(sopeerlabel); 1080 1081 biba_copy_effective(source, dest); 1082} 1083 1084/* 1085 * Labeling event operations: System V IPC objects. 1086 */ 1087static void 1088biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr, 1089 struct label *msqlabel, struct msg *msgptr, struct label *msglabel) 1090{ 1091 struct mac_biba *source, *dest; 1092 1093 /* Ignore the msgq label */ 1094 source = SLOT(cred->cr_label); 1095 dest = SLOT(msglabel); 1096 1097 biba_copy_effective(source, dest); 1098} 1099 1100static void 1101biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr, 1102 struct label *msqlabel) 1103{ 1104 struct mac_biba *source, *dest; 1105 1106 source = SLOT(cred->cr_label); 1107 dest = SLOT(msqlabel); 1108 1109 biba_copy_effective(source, dest); 1110} 1111 1112static void 1113biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr, 1114 struct label *semalabel) 1115{ 1116 struct mac_biba *source, *dest; 1117 1118 source = SLOT(cred->cr_label); 1119 dest = SLOT(semalabel); 1120 1121 biba_copy_effective(source, dest); 1122} 1123 1124static void 1125biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr, 1126 struct label *shmlabel) 1127{ 1128 struct mac_biba *source, *dest; 1129 1130 source = SLOT(cred->cr_label); 1131 dest = SLOT(shmlabel); 1132 1133 biba_copy_effective(source, dest); 1134} 1135 1136/* 1137 * Labeling event operations: network objects. 1138 */ 1139static void 1140biba_socketpeer_set_from_socket(struct socket *oldso, 1141 struct label *oldsolabel, struct socket *newso, 1142 struct label *newsopeerlabel) 1143{ 1144 struct mac_biba *source, *dest; 1145 1146 source = SLOT(oldsolabel); 1147 dest = SLOT(newsopeerlabel); 1148 1149 biba_copy_effective(source, dest); 1150} 1151 1152static void 1153biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d, 1154 struct label *dlabel) 1155{ 1156 struct mac_biba *source, *dest; 1157 1158 source = SLOT(cred->cr_label); 1159 dest = SLOT(dlabel); 1160 1161 biba_copy_effective(source, dest); 1162} 1163 1164static void 1165biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1166{ 1167 char tifname[IFNAMSIZ], *p, *q; 1168 char tiflist[sizeof(trusted_interfaces)]; 1169 struct mac_biba *dest; 1170 int len, type; 1171 1172 dest = SLOT(ifplabel); 1173 1174 if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) { 1175 type = MAC_BIBA_TYPE_EQUAL; 1176 goto set; 1177 } 1178 1179 if (trust_all_interfaces) { 1180 type = MAC_BIBA_TYPE_HIGH; 1181 goto set; 1182 } 1183 1184 type = MAC_BIBA_TYPE_LOW; 1185 1186 if (trusted_interfaces[0] == '\0' || 1187 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1188 goto set; 1189 1190 bzero(tiflist, sizeof(tiflist)); 1191 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1192 if(*p != ' ' && *p != '\t') 1193 *q = *p; 1194 1195 for (p = q = tiflist;; p++) { 1196 if (*p == ',' || *p == '\0') { 1197 len = p - q; 1198 if (len < IFNAMSIZ) { 1199 bzero(tifname, sizeof(tifname)); 1200 bcopy(q, tifname, len); 1201 if (strcmp(tifname, ifp->if_xname) == 0) { 1202 type = MAC_BIBA_TYPE_HIGH; 1203 break; 1204 } 1205 } else { 1206 *p = '\0'; 1207 printf("mac_biba warning: interface name " 1208 "\"%s\" is too long (must be < %d)\n", 1209 q, IFNAMSIZ); 1210 } 1211 if (*p == '\0') 1212 break; 1213 q = p + 1; 1214 } 1215 } 1216set: 1217 biba_set_effective(dest, type, 0, NULL); 1218 biba_set_range(dest, type, 0, NULL, type, 0, NULL); 1219} 1220 1221static void 1222biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1223 struct label *ipqlabel) 1224{ 1225 struct mac_biba *source, *dest; 1226 1227 source = SLOT(mlabel); 1228 dest = SLOT(ipqlabel); 1229 1230 biba_copy_effective(source, dest); 1231} 1232 1233static void 1234biba_ipq_reassemble(struct ipq *ipq, struct label *ipqlabel, struct mbuf *m, 1235 struct label *mlabel) 1236{ 1237 struct mac_biba *source, *dest; 1238 1239 source = SLOT(ipqlabel); 1240 dest = SLOT(mlabel); 1241 1242 /* Just use the head, since we require them all to match. */ 1243 biba_copy_effective(source, dest); 1244} 1245 1246static void 1247biba_netinet_fragment(struct mbuf *m, struct label *mlabel, 1248 struct mbuf *frag, struct label *fraglabel) 1249{ 1250 struct mac_biba *source, *dest; 1251 1252 source = SLOT(mlabel); 1253 dest = SLOT(fraglabel); 1254 1255 biba_copy_effective(source, dest); 1256} 1257 1258static void 1259biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1260 struct mbuf *m, struct label *mlabel) 1261{ 1262 struct mac_biba *source, *dest; 1263 1264 source = SLOT(inplabel); 1265 dest = SLOT(mlabel); 1266 1267 biba_copy_effective(source, dest); 1268} 1269 1270static void 1271biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, 1272 struct mbuf *m, struct label *mlabel) 1273{ 1274 struct mac_biba *source, *dest; 1275 1276 source = SLOT(dlabel); 1277 dest = SLOT(mlabel); 1278 1279 biba_copy_effective(source, dest); 1280} 1281 1282static void 1283biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1284 struct mbuf *m, struct label *mlabel) 1285{ 1286 struct mac_biba *source, *dest; 1287 1288 source = SLOT(ifplabel); 1289 dest = SLOT(mlabel); 1290 1291 biba_copy_effective(source, dest); 1292} 1293 1294static int 1295biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1296 struct label *ipqlabel) 1297{ 1298 struct mac_biba *a, *b; 1299 1300 a = SLOT(ipqlabel); 1301 b = SLOT(mlabel); 1302 1303 return (biba_equal_effective(a, b)); 1304} 1305 1306static void 1307biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1308 struct label *ifplabel, struct label *newlabel) 1309{ 1310 struct mac_biba *source, *dest; 1311 1312 source = SLOT(newlabel); 1313 dest = SLOT(ifplabel); 1314 1315 biba_copy(source, dest); 1316} 1317 1318static void 1319biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1320 struct label *ipqlabel) 1321{ 1322 1323 /* NOOP: we only accept matching labels, so no need to update */ 1324} 1325 1326static void 1327biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1328 struct inpcb *inp, struct label *inplabel) 1329{ 1330 struct mac_biba *source, *dest; 1331 1332 source = SLOT(solabel); 1333 dest = SLOT(inplabel); 1334 1335 biba_copy(source, dest); 1336} 1337 1338static void 1339biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1340 struct mbuf *m, struct label *mlabel) 1341{ 1342 struct mac_biba *dest; 1343 1344 dest = SLOT(mlabel); 1345 1346 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1347} 1348 1349static void 1350biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1351 struct mbuf *m, struct label *mlabel) 1352{ 1353 struct mac_biba *dest; 1354 1355 dest = SLOT(mlabel); 1356 1357 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1358} 1359 1360static void 1361biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1362 struct mbuf *msend, struct label *msendlabel) 1363{ 1364 struct mac_biba *source, *dest; 1365 1366 source = SLOT(mrecvlabel); 1367 dest = SLOT(msendlabel); 1368 1369 biba_copy_effective(source, dest); 1370} 1371 1372static void 1373biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1374{ 1375 struct mac_biba *dest; 1376 1377 dest = SLOT(mlabel); 1378 1379 /* XXX: where is the label for the firewall really coming from? */ 1380 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1381} 1382 1383static void 1384biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1385 struct mbuf *msend, struct label *msendlabel) 1386{ 1387 struct mac_biba *source, *dest; 1388 1389 source = SLOT(mrecvlabel); 1390 dest = SLOT(msendlabel); 1391 1392 biba_copy_effective(source, dest); 1393} 1394 1395static void 1396biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1397 struct mbuf *m, struct label *mlabel) 1398{ 1399 struct mac_biba *dest; 1400 1401 dest = SLOT(mlabel); 1402 1403 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1404} 1405 1406static void 1407biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1408 struct mbuf *m, struct label *mlabel) 1409{ 1410 struct mac_biba *dest; 1411 1412 dest = SLOT(mlabel); 1413 1414 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1415} 1416 1417/* 1418 * Labeling event operations: processes. 1419 */ 1420static void 1421biba_proc_create_swapper(struct ucred *cred) 1422{ 1423 struct mac_biba *dest; 1424 1425 dest = SLOT(cred->cr_label); 1426 1427 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1428 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1429 0, NULL); 1430} 1431 1432static void 1433biba_proc_create_init(struct ucred *cred) 1434{ 1435 struct mac_biba *dest; 1436 1437 dest = SLOT(cred->cr_label); 1438 1439 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1440 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1441 0, NULL); 1442} 1443 1444static void 1445biba_proc_associate_nfsd(struct ucred *cred) 1446{ 1447 struct mac_biba *label; 1448 1449 label = SLOT(cred->cr_label); 1450 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); 1451 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1452 0, NULL); 1453} 1454 1455static void 1456biba_cred_relabel(struct ucred *cred, struct label *newlabel) 1457{ 1458 struct mac_biba *source, *dest; 1459 1460 source = SLOT(newlabel); 1461 dest = SLOT(cred->cr_label); 1462 1463 biba_copy(source, dest); 1464} 1465 1466/* 1467 * Label cleanup/flush operations 1468 */ 1469static void 1470biba_sysvmsg_cleanup(struct label *msglabel) 1471{ 1472 1473 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 1474} 1475 1476static void 1477biba_sysvmsq_cleanup(struct label *msqlabel) 1478{ 1479 1480 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 1481} 1482 1483static void 1484biba_sysvsem_cleanup(struct label *semalabel) 1485{ 1486 1487 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 1488} 1489 1490static void 1491biba_sysvshm_cleanup(struct label *shmlabel) 1492{ 1493 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 1494} 1495 1496/* 1497 * Access control checks. 1498 */ 1499static int 1500biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 1501 struct ifnet *ifp, struct label *ifplabel) 1502{ 1503 struct mac_biba *a, *b; 1504 1505 if (!biba_enabled) 1506 return (0); 1507 1508 a = SLOT(dlabel); 1509 b = SLOT(ifplabel); 1510 1511 if (biba_equal_effective(a, b)) 1512 return (0); 1513 return (EACCES); 1514} 1515 1516static int 1517biba_cred_check_relabel(struct ucred *cred, struct label *newlabel) 1518{ 1519 struct mac_biba *subj, *new; 1520 int error; 1521 1522 subj = SLOT(cred->cr_label); 1523 new = SLOT(newlabel); 1524 1525 /* 1526 * If there is a Biba label update for the credential, it may 1527 * be an update of the effective, range, or both. 1528 */ 1529 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1530 if (error) 1531 return (error); 1532 1533 /* 1534 * If the Biba label is to be changed, authorize as appropriate. 1535 */ 1536 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1537 /* 1538 * If the change request modifies both the Biba label 1539 * effective and range, check that the new effective will be 1540 * in the new range. 1541 */ 1542 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 1543 MAC_BIBA_FLAGS_BOTH && 1544 !biba_effective_in_range(new, new)) 1545 return (EINVAL); 1546 1547 /* 1548 * To change the Biba effective label on a credential, the 1549 * new effective label must be in the current range. 1550 */ 1551 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && 1552 !biba_effective_in_range(new, subj)) 1553 return (EPERM); 1554 1555 /* 1556 * To change the Biba range on a credential, the new range 1557 * label must be in the current range. 1558 */ 1559 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1560 !biba_range_in_range(new, subj)) 1561 return (EPERM); 1562 1563 /* 1564 * To have EQUAL in any component of the new credential Biba 1565 * label, the subject must already have EQUAL in their label. 1566 */ 1567 if (biba_contains_equal(new)) { 1568 error = biba_subject_privileged(subj); 1569 if (error) 1570 return (error); 1571 } 1572 } 1573 1574 return (0); 1575} 1576 1577static int 1578biba_cred_check_visible(struct ucred *u1, struct ucred *u2) 1579{ 1580 struct mac_biba *subj, *obj; 1581 1582 if (!biba_enabled) 1583 return (0); 1584 1585 subj = SLOT(u1->cr_label); 1586 obj = SLOT(u2->cr_label); 1587 1588 /* XXX: range */ 1589 if (!biba_dominate_effective(obj, subj)) 1590 return (ESRCH); 1591 1592 return (0); 1593} 1594 1595static int 1596biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1597 struct label *ifplabel, struct label *newlabel) 1598{ 1599 struct mac_biba *subj, *new; 1600 int error; 1601 1602 subj = SLOT(cred->cr_label); 1603 new = SLOT(newlabel); 1604 1605 /* 1606 * If there is a Biba label update for the interface, it may be an 1607 * update of the effective, range, or both. 1608 */ 1609 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1610 if (error) 1611 return (error); 1612 1613 /* 1614 * Relabling network interfaces requires Biba privilege. 1615 */ 1616 error = biba_subject_privileged(subj); 1617 if (error) 1618 return (error); 1619 1620 return (0); 1621} 1622 1623static int 1624biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1625 struct mbuf *m, struct label *mlabel) 1626{ 1627 struct mac_biba *p, *i; 1628 1629 if (!biba_enabled) 1630 return (0); 1631 1632 p = SLOT(mlabel); 1633 i = SLOT(ifplabel); 1634 1635 return (biba_effective_in_range(p, i) ? 0 : EACCES); 1636} 1637 1638static int 1639biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1640 struct mbuf *m, struct label *mlabel) 1641{ 1642 struct mac_biba *p, *i; 1643 1644 if (!biba_enabled) 1645 return (0); 1646 1647 p = SLOT(mlabel); 1648 i = SLOT(inplabel); 1649 1650 return (biba_equal_effective(p, i) ? 0 : EACCES); 1651} 1652 1653static int 1654biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 1655 struct label *msglabel) 1656{ 1657 struct mac_biba *subj, *obj; 1658 1659 if (!biba_enabled) 1660 return (0); 1661 1662 subj = SLOT(cred->cr_label); 1663 obj = SLOT(msglabel); 1664 1665 if (!biba_dominate_effective(obj, subj)) 1666 return (EACCES); 1667 1668 return (0); 1669} 1670 1671static int 1672biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 1673 struct label *msglabel) 1674{ 1675 struct mac_biba *subj, *obj; 1676 1677 if (!biba_enabled) 1678 return (0); 1679 1680 subj = SLOT(cred->cr_label); 1681 obj = SLOT(msglabel); 1682 1683 if (!biba_dominate_effective(subj, obj)) 1684 return (EACCES); 1685 1686 return (0); 1687} 1688 1689static int 1690biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 1691 struct label *msqklabel) 1692{ 1693 struct mac_biba *subj, *obj; 1694 1695 if (!biba_enabled) 1696 return (0); 1697 1698 subj = SLOT(cred->cr_label); 1699 obj = SLOT(msqklabel); 1700 1701 if (!biba_dominate_effective(obj, subj)) 1702 return (EACCES); 1703 1704 return (0); 1705} 1706 1707static int 1708biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 1709 struct label *msqklabel) 1710{ 1711 struct mac_biba *subj, *obj; 1712 1713 if (!biba_enabled) 1714 return (0); 1715 1716 subj = SLOT(cred->cr_label); 1717 obj = SLOT(msqklabel); 1718 1719 if (!biba_dominate_effective(subj, obj)) 1720 return (EACCES); 1721 1722 return (0); 1723} 1724 1725static int 1726biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 1727 struct label *msqklabel) 1728{ 1729 struct mac_biba *subj, *obj; 1730 1731 if (!biba_enabled) 1732 return (0); 1733 1734 subj = SLOT(cred->cr_label); 1735 obj = SLOT(msqklabel); 1736 1737 if (!biba_dominate_effective(obj, subj)) 1738 return (EACCES); 1739 1740 return (0); 1741} 1742 1743static int 1744biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 1745 struct label *msqklabel, int cmd) 1746{ 1747 struct mac_biba *subj, *obj; 1748 1749 if (!biba_enabled) 1750 return (0); 1751 1752 subj = SLOT(cred->cr_label); 1753 obj = SLOT(msqklabel); 1754 1755 switch(cmd) { 1756 case IPC_RMID: 1757 case IPC_SET: 1758 if (!biba_dominate_effective(subj, obj)) 1759 return (EACCES); 1760 break; 1761 1762 case IPC_STAT: 1763 if (!biba_dominate_effective(obj, subj)) 1764 return (EACCES); 1765 break; 1766 1767 default: 1768 return (EACCES); 1769 } 1770 1771 return (0); 1772} 1773 1774static int 1775biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 1776 struct label *semaklabel, int cmd) 1777{ 1778 struct mac_biba *subj, *obj; 1779 1780 if (!biba_enabled) 1781 return (0); 1782 1783 subj = SLOT(cred->cr_label); 1784 obj = SLOT(semaklabel); 1785 1786 switch(cmd) { 1787 case IPC_RMID: 1788 case IPC_SET: 1789 case SETVAL: 1790 case SETALL: 1791 if (!biba_dominate_effective(subj, obj)) 1792 return (EACCES); 1793 break; 1794 1795 case IPC_STAT: 1796 case GETVAL: 1797 case GETPID: 1798 case GETNCNT: 1799 case GETZCNT: 1800 case GETALL: 1801 if (!biba_dominate_effective(obj, subj)) 1802 return (EACCES); 1803 break; 1804 1805 default: 1806 return (EACCES); 1807 } 1808 1809 return (0); 1810} 1811 1812static int 1813biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 1814 struct label *semaklabel) 1815{ 1816 struct mac_biba *subj, *obj; 1817 1818 if (!biba_enabled) 1819 return (0); 1820 1821 subj = SLOT(cred->cr_label); 1822 obj = SLOT(semaklabel); 1823 1824 if (!biba_dominate_effective(obj, subj)) 1825 return (EACCES); 1826 1827 return (0); 1828} 1829 1830static int 1831biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 1832 struct label *semaklabel, size_t accesstype) 1833{ 1834 struct mac_biba *subj, *obj; 1835 1836 if (!biba_enabled) 1837 return (0); 1838 1839 subj = SLOT(cred->cr_label); 1840 obj = SLOT(semaklabel); 1841 1842 if (accesstype & SEM_R) 1843 if (!biba_dominate_effective(obj, subj)) 1844 return (EACCES); 1845 1846 if (accesstype & SEM_A) 1847 if (!biba_dominate_effective(subj, obj)) 1848 return (EACCES); 1849 1850 return (0); 1851} 1852 1853static int 1854biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 1855 struct label *shmseglabel, int shmflg) 1856{ 1857 struct mac_biba *subj, *obj; 1858 1859 if (!biba_enabled) 1860 return (0); 1861 1862 subj = SLOT(cred->cr_label); 1863 obj = SLOT(shmseglabel); 1864 1865 if (!biba_dominate_effective(obj, subj)) 1866 return (EACCES); 1867 if ((shmflg & SHM_RDONLY) == 0) { 1868 if (!biba_dominate_effective(subj, obj)) 1869 return (EACCES); 1870 } 1871 1872 return (0); 1873} 1874 1875static int 1876biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 1877 struct label *shmseglabel, int cmd) 1878{ 1879 struct mac_biba *subj, *obj; 1880 1881 if (!biba_enabled) 1882 return (0); 1883 1884 subj = SLOT(cred->cr_label); 1885 obj = SLOT(shmseglabel); 1886 1887 switch(cmd) { 1888 case IPC_RMID: 1889 case IPC_SET: 1890 if (!biba_dominate_effective(subj, obj)) 1891 return (EACCES); 1892 break; 1893 1894 case IPC_STAT: 1895 case SHM_STAT: 1896 if (!biba_dominate_effective(obj, subj)) 1897 return (EACCES); 1898 break; 1899 1900 default: 1901 return (EACCES); 1902 } 1903 1904 return (0); 1905} 1906 1907static int 1908biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 1909 struct label *shmseglabel, int shmflg) 1910{ 1911 struct mac_biba *subj, *obj; 1912 1913 if (!biba_enabled) 1914 return (0); 1915 1916 subj = SLOT(cred->cr_label); 1917 obj = SLOT(shmseglabel); 1918 1919 if (!biba_dominate_effective(obj, subj)) 1920 return (EACCES); 1921 1922 return (0); 1923} 1924 1925static int 1926biba_kld_check_load(struct ucred *cred, struct vnode *vp, 1927 struct label *vplabel) 1928{ 1929 struct mac_biba *subj, *obj; 1930 int error; 1931 1932 if (!biba_enabled) 1933 return (0); 1934 1935 subj = SLOT(cred->cr_label); 1936 1937 error = biba_subject_privileged(subj); 1938 if (error) 1939 return (error); 1940 1941 obj = SLOT(vplabel); 1942 if (!biba_high_effective(obj)) 1943 return (EACCES); 1944 1945 return (0); 1946} 1947 1948static int 1949biba_mount_check_stat(struct ucred *cred, struct mount *mp, 1950 struct label *mplabel) 1951{ 1952 struct mac_biba *subj, *obj; 1953 1954 if (!biba_enabled) 1955 return (0); 1956 1957 subj = SLOT(cred->cr_label); 1958 obj = SLOT(mplabel); 1959 1960 if (!biba_dominate_effective(obj, subj)) 1961 return (EACCES); 1962 1963 return (0); 1964} 1965 1966static int 1967biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1968 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1969{ 1970 1971 if(!biba_enabled) 1972 return (0); 1973 1974 /* XXX: This will be implemented soon... */ 1975 1976 return (0); 1977} 1978 1979static int 1980biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1981 struct label *pplabel) 1982{ 1983 struct mac_biba *subj, *obj; 1984 1985 if (!biba_enabled) 1986 return (0); 1987 1988 subj = SLOT(cred->cr_label); 1989 obj = SLOT(pplabel); 1990 1991 if (!biba_dominate_effective(obj, subj)) 1992 return (EACCES); 1993 1994 return (0); 1995} 1996 1997static int 1998biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1999 struct label *pplabel) 2000{ 2001 struct mac_biba *subj, *obj; 2002 2003 if (!biba_enabled) 2004 return (0); 2005 2006 subj = SLOT(cred->cr_label); 2007 obj = SLOT(pplabel); 2008 2009 if (!biba_dominate_effective(obj, subj)) 2010 return (EACCES); 2011 2012 return (0); 2013} 2014 2015static int 2016biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 2017 struct label *pplabel, struct label *newlabel) 2018{ 2019 struct mac_biba *subj, *obj, *new; 2020 int error; 2021 2022 new = SLOT(newlabel); 2023 subj = SLOT(cred->cr_label); 2024 obj = SLOT(pplabel); 2025 2026 /* 2027 * If there is a Biba label update for a pipe, it must be a effective 2028 * update. 2029 */ 2030 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2031 if (error) 2032 return (error); 2033 2034 /* 2035 * To perform a relabel of a pipe (Biba label or not), Biba must 2036 * authorize the relabel. 2037 */ 2038 if (!biba_effective_in_range(obj, subj)) 2039 return (EPERM); 2040 2041 /* 2042 * If the Biba label is to be changed, authorize as appropriate. 2043 */ 2044 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2045 /* 2046 * To change the Biba label on a pipe, the new pipe label 2047 * must be in the subject range. 2048 */ 2049 if (!biba_effective_in_range(new, subj)) 2050 return (EPERM); 2051 2052 /* 2053 * To change the Biba label on a pipe to be EQUAL, the 2054 * subject must have appropriate privilege. 2055 */ 2056 if (biba_contains_equal(new)) { 2057 error = biba_subject_privileged(subj); 2058 if (error) 2059 return (error); 2060 } 2061 } 2062 2063 return (0); 2064} 2065 2066static int 2067biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 2068 struct label *pplabel) 2069{ 2070 struct mac_biba *subj, *obj; 2071 2072 if (!biba_enabled) 2073 return (0); 2074 2075 subj = SLOT(cred->cr_label); 2076 obj = SLOT(pplabel); 2077 2078 if (!biba_dominate_effective(obj, subj)) 2079 return (EACCES); 2080 2081 return (0); 2082} 2083 2084static int 2085biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, 2086 struct label *pplabel) 2087{ 2088 struct mac_biba *subj, *obj; 2089 2090 if (!biba_enabled) 2091 return (0); 2092 2093 subj = SLOT(cred->cr_label); 2094 obj = SLOT(pplabel); 2095 2096 if (!biba_dominate_effective(subj, obj)) 2097 return (EACCES); 2098 2099 return (0); 2100} 2101 2102static int 2103biba_posixsem_check_write(struct ucred *cred, struct ksem *ks, 2104 struct label *kslabel) 2105{ 2106 struct mac_biba *subj, *obj; 2107 2108 if (!biba_enabled) 2109 return (0); 2110 2111 subj = SLOT(cred->cr_label); 2112 obj = SLOT(kslabel); 2113 2114 if (!biba_dominate_effective(subj, obj)) 2115 return (EACCES); 2116 2117 return (0); 2118} 2119 2120static int 2121biba_posixsem_check_rdonly(struct ucred *cred, struct ksem *ks, 2122 struct label *kslabel) 2123{ 2124 struct mac_biba *subj, *obj; 2125 2126 if (!biba_enabled) 2127 return (0); 2128 2129 subj = SLOT(cred->cr_label); 2130 obj = SLOT(kslabel); 2131 2132 if (!biba_dominate_effective(obj, subj)) 2133 return (EACCES); 2134 2135 return (0); 2136} 2137 2138static int 2139biba_proc_check_debug(struct ucred *cred, struct proc *p) 2140{ 2141 struct mac_biba *subj, *obj; 2142 2143 if (!biba_enabled) 2144 return (0); 2145 2146 subj = SLOT(cred->cr_label); 2147 obj = SLOT(p->p_ucred->cr_label); 2148 2149 /* XXX: range checks */ 2150 if (!biba_dominate_effective(obj, subj)) 2151 return (ESRCH); 2152 if (!biba_dominate_effective(subj, obj)) 2153 return (EACCES); 2154 2155 return (0); 2156} 2157 2158static int 2159biba_proc_check_sched(struct ucred *cred, struct proc *p) 2160{ 2161 struct mac_biba *subj, *obj; 2162 2163 if (!biba_enabled) 2164 return (0); 2165 2166 subj = SLOT(cred->cr_label); 2167 obj = SLOT(p->p_ucred->cr_label); 2168 2169 /* XXX: range checks */ 2170 if (!biba_dominate_effective(obj, subj)) 2171 return (ESRCH); 2172 if (!biba_dominate_effective(subj, obj)) 2173 return (EACCES); 2174 2175 return (0); 2176} 2177 2178static int 2179biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 2180{ 2181 struct mac_biba *subj, *obj; 2182 2183 if (!biba_enabled) 2184 return (0); 2185 2186 subj = SLOT(cred->cr_label); 2187 obj = SLOT(p->p_ucred->cr_label); 2188 2189 /* XXX: range checks */ 2190 if (!biba_dominate_effective(obj, subj)) 2191 return (ESRCH); 2192 if (!biba_dominate_effective(subj, obj)) 2193 return (EACCES); 2194 2195 return (0); 2196} 2197 2198static int 2199biba_socket_check_deliver(struct socket *so, struct label *solabel, 2200 struct mbuf *m, struct label *mlabel) 2201{ 2202 struct mac_biba *p, *s; 2203 2204 if (!biba_enabled) 2205 return (0); 2206 2207 p = SLOT(mlabel); 2208 s = SLOT(solabel); 2209 2210 return (biba_equal_effective(p, s) ? 0 : EACCES); 2211} 2212 2213static int 2214biba_socket_check_relabel(struct ucred *cred, struct socket *so, 2215 struct label *solabel, struct label *newlabel) 2216{ 2217 struct mac_biba *subj, *obj, *new; 2218 int error; 2219 2220 new = SLOT(newlabel); 2221 subj = SLOT(cred->cr_label); 2222 obj = SLOT(solabel); 2223 2224 /* 2225 * If there is a Biba label update for the socket, it may be an 2226 * update of effective. 2227 */ 2228 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2229 if (error) 2230 return (error); 2231 2232 /* 2233 * To relabel a socket, the old socket effective must be in the 2234 * subject range. 2235 */ 2236 if (!biba_effective_in_range(obj, subj)) 2237 return (EPERM); 2238 2239 /* 2240 * If the Biba label is to be changed, authorize as appropriate. 2241 */ 2242 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2243 /* 2244 * To relabel a socket, the new socket effective must be in 2245 * the subject range. 2246 */ 2247 if (!biba_effective_in_range(new, subj)) 2248 return (EPERM); 2249 2250 /* 2251 * To change the Biba label on the socket to contain EQUAL, 2252 * the subject must have appropriate privilege. 2253 */ 2254 if (biba_contains_equal(new)) { 2255 error = biba_subject_privileged(subj); 2256 if (error) 2257 return (error); 2258 } 2259 } 2260 2261 return (0); 2262} 2263 2264static int 2265biba_socket_check_visible(struct ucred *cred, struct socket *so, 2266 struct label *solabel) 2267{ 2268 struct mac_biba *subj, *obj; 2269 2270 if (!biba_enabled) 2271 return (0); 2272 2273 subj = SLOT(cred->cr_label); 2274 obj = SLOT(solabel); 2275 2276 if (!biba_dominate_effective(obj, subj)) 2277 return (ENOENT); 2278 2279 return (0); 2280} 2281 2282/* 2283 * Some system privileges are allowed regardless of integrity grade; others 2284 * are allowed only when running with privilege with respect to the Biba 2285 * policy as they might otherwise allow bypassing of the integrity policy. 2286 */ 2287static int 2288biba_priv_check(struct ucred *cred, int priv) 2289{ 2290 struct mac_biba *subj; 2291 int error; 2292 2293 if (!biba_enabled) 2294 return (0); 2295 2296 /* 2297 * Exempt only specific privileges from the Biba integrity policy. 2298 */ 2299 switch (priv) { 2300 case PRIV_KTRACE: 2301 case PRIV_MSGBUF: 2302 2303 /* 2304 * Allow processes to manipulate basic process audit properties, and 2305 * to submit audit records. 2306 */ 2307 case PRIV_AUDIT_GETAUDIT: 2308 case PRIV_AUDIT_SETAUDIT: 2309 case PRIV_AUDIT_SUBMIT: 2310 2311 /* 2312 * Allow processes to manipulate their regular UNIX credentials. 2313 */ 2314 case PRIV_CRED_SETUID: 2315 case PRIV_CRED_SETEUID: 2316 case PRIV_CRED_SETGID: 2317 case PRIV_CRED_SETEGID: 2318 case PRIV_CRED_SETGROUPS: 2319 case PRIV_CRED_SETREUID: 2320 case PRIV_CRED_SETREGID: 2321 case PRIV_CRED_SETRESUID: 2322 case PRIV_CRED_SETRESGID: 2323 2324 /* 2325 * Allow processes to perform system monitoring. 2326 */ 2327 case PRIV_SEEOTHERGIDS: 2328 case PRIV_SEEOTHERUIDS: 2329 break; 2330 2331 /* 2332 * Allow access to general process debugging facilities. We 2333 * separately control debugging based on MAC label. 2334 */ 2335 case PRIV_DEBUG_DIFFCRED: 2336 case PRIV_DEBUG_SUGID: 2337 case PRIV_DEBUG_UNPRIV: 2338 2339 /* 2340 * Allow manipulating jails. 2341 */ 2342 case PRIV_JAIL_ATTACH: 2343 2344 /* 2345 * Allow privilege with respect to the Partition policy, but not the 2346 * Privs policy. 2347 */ 2348 case PRIV_MAC_PARTITION: 2349 2350 /* 2351 * Allow privilege with respect to process resource limits and login 2352 * context. 2353 */ 2354 case PRIV_PROC_LIMIT: 2355 case PRIV_PROC_SETLOGIN: 2356 case PRIV_PROC_SETRLIMIT: 2357 2358 /* 2359 * Allow System V and POSIX IPC privileges. 2360 */ 2361 case PRIV_IPC_READ: 2362 case PRIV_IPC_WRITE: 2363 case PRIV_IPC_ADMIN: 2364 case PRIV_IPC_MSGSIZE: 2365 case PRIV_MQ_ADMIN: 2366 2367 /* 2368 * Allow certain scheduler manipulations -- possibly this should be 2369 * controlled by more fine-grained policy, as potentially low 2370 * integrity processes can deny CPU to higher integrity ones. 2371 */ 2372 case PRIV_SCHED_DIFFCRED: 2373 case PRIV_SCHED_SETPRIORITY: 2374 case PRIV_SCHED_RTPRIO: 2375 case PRIV_SCHED_SETPOLICY: 2376 case PRIV_SCHED_SET: 2377 case PRIV_SCHED_SETPARAM: 2378 2379 /* 2380 * More IPC privileges. 2381 */ 2382 case PRIV_SEM_WRITE: 2383 2384 /* 2385 * Allow signaling privileges subject to integrity policy. 2386 */ 2387 case PRIV_SIGNAL_DIFFCRED: 2388 case PRIV_SIGNAL_SUGID: 2389 2390 /* 2391 * Allow access to only limited sysctls from lower integrity levels; 2392 * piggy-back on the Jail definition. 2393 */ 2394 case PRIV_SYSCTL_WRITEJAIL: 2395 2396 /* 2397 * Allow TTY-based privileges, subject to general device access using 2398 * labels on TTY device nodes, but not console privilege. 2399 */ 2400 case PRIV_TTY_DRAINWAIT: 2401 case PRIV_TTY_DTRWAIT: 2402 case PRIV_TTY_EXCLUSIVE: 2403 case PRIV_TTY_PRISON: 2404 case PRIV_TTY_STI: 2405 case PRIV_TTY_SETA: 2406 2407 /* 2408 * Grant most VFS privileges, as almost all are in practice bounded 2409 * by more specific checks using labels. 2410 */ 2411 case PRIV_VFS_READ: 2412 case PRIV_VFS_WRITE: 2413 case PRIV_VFS_ADMIN: 2414 case PRIV_VFS_EXEC: 2415 case PRIV_VFS_LOOKUP: 2416 case PRIV_VFS_CHFLAGS_DEV: 2417 case PRIV_VFS_CHOWN: 2418 case PRIV_VFS_CHROOT: 2419 case PRIV_VFS_RETAINSUGID: 2420 case PRIV_VFS_EXCEEDQUOTA: 2421 case PRIV_VFS_FCHROOT: 2422 case PRIV_VFS_FHOPEN: 2423 case PRIV_VFS_FHSTATFS: 2424 case PRIV_VFS_GENERATION: 2425 case PRIV_VFS_GETFH: 2426 case PRIV_VFS_GETQUOTA: 2427 case PRIV_VFS_LINK: 2428 case PRIV_VFS_MOUNT: 2429 case PRIV_VFS_MOUNT_OWNER: 2430 case PRIV_VFS_MOUNT_PERM: 2431 case PRIV_VFS_MOUNT_SUIDDIR: 2432 case PRIV_VFS_MOUNT_NONUSER: 2433 case PRIV_VFS_SETGID: 2434 case PRIV_VFS_STICKYFILE: 2435 case PRIV_VFS_SYSFLAGS: 2436 case PRIV_VFS_UNMOUNT: 2437 2438 /* 2439 * Allow VM privileges; it would be nice if these were subject to 2440 * resource limits. 2441 */ 2442 case PRIV_VM_MADV_PROTECT: 2443 case PRIV_VM_MLOCK: 2444 case PRIV_VM_MUNLOCK: 2445 2446 /* 2447 * Allow some but not all network privileges. In general, dont allow 2448 * reconfiguring the network stack, just normal use. 2449 */ 2450 case PRIV_NETATALK_RESERVEDPORT: 2451 case PRIV_NETINET_RESERVEDPORT: 2452 case PRIV_NETINET_RAW: 2453 case PRIV_NETINET_REUSEPORT: 2454 case PRIV_NETIPX_RESERVEDPORT: 2455 case PRIV_NETIPX_RAW: 2456 break; 2457 2458 /* 2459 * All remaining system privileges are allow only if the process 2460 * holds privilege with respect to the Biba policy. 2461 */ 2462 default: 2463 subj = SLOT(cred->cr_label); 2464 error = biba_subject_privileged(subj); 2465 if (error) 2466 return (error); 2467 } 2468 return (0); 2469} 2470 2471static int 2472biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2473 struct label *vplabel) 2474{ 2475 struct mac_biba *subj, *obj; 2476 int error; 2477 2478 if (!biba_enabled) 2479 return (0); 2480 2481 subj = SLOT(cred->cr_label); 2482 2483 error = biba_subject_privileged(subj); 2484 if (error) 2485 return (error); 2486 2487 if (vplabel == NULL) 2488 return (0); 2489 2490 obj = SLOT(vplabel); 2491 if (!biba_high_effective(obj)) 2492 return (EACCES); 2493 2494 return (0); 2495} 2496 2497static int 2498biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2499 struct label *vplabel) 2500{ 2501 struct mac_biba *subj, *obj; 2502 int error; 2503 2504 if (!biba_enabled) 2505 return (0); 2506 2507 subj = SLOT(cred->cr_label); 2508 2509 error = biba_subject_privileged(subj); 2510 if (error) 2511 return (error); 2512 2513 if (vplabel == NULL) 2514 return (0); 2515 2516 obj = SLOT(vplabel); 2517 if (!biba_high_effective(obj)) 2518 return (EACCES); 2519 2520 return (0); 2521} 2522 2523static int 2524biba_system_check_auditon(struct ucred *cred, int cmd) 2525{ 2526 struct mac_biba *subj; 2527 int error; 2528 2529 if (!biba_enabled) 2530 return (0); 2531 2532 subj = SLOT(cred->cr_label); 2533 2534 error = biba_subject_privileged(subj); 2535 if (error) 2536 return (error); 2537 2538 return (0); 2539} 2540 2541static int 2542biba_system_check_swapon(struct ucred *cred, struct vnode *vp, 2543 struct label *vplabel) 2544{ 2545 struct mac_biba *subj, *obj; 2546 int error; 2547 2548 if (!biba_enabled) 2549 return (0); 2550 2551 subj = SLOT(cred->cr_label); 2552 obj = SLOT(vplabel); 2553 2554 error = biba_subject_privileged(subj); 2555 if (error) 2556 return (error); 2557 2558 if (!biba_high_effective(obj)) 2559 return (EACCES); 2560 2561 return (0); 2562} 2563 2564static int 2565biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2566 struct label *label) 2567{ 2568 struct mac_biba *subj; 2569 int error; 2570 2571 if (!biba_enabled) 2572 return (0); 2573 2574 subj = SLOT(cred->cr_label); 2575 2576 error = biba_subject_privileged(subj); 2577 if (error) 2578 return (error); 2579 2580 return (0); 2581} 2582 2583static int 2584biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2585 void *arg1, int arg2, struct sysctl_req *req) 2586{ 2587 struct mac_biba *subj; 2588 int error; 2589 2590 if (!biba_enabled) 2591 return (0); 2592 2593 subj = SLOT(cred->cr_label); 2594 2595 /* 2596 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2597 * but also require privilege to change them. 2598 */ 2599 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2600 if (!biba_subject_dominate_high(subj)) 2601 return (EACCES); 2602 2603 error = biba_subject_privileged(subj); 2604 if (error) 2605 return (error); 2606 } 2607 2608 return (0); 2609} 2610 2611static int 2612biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2613 struct label *dvplabel) 2614{ 2615 struct mac_biba *subj, *obj; 2616 2617 if (!biba_enabled) 2618 return (0); 2619 2620 subj = SLOT(cred->cr_label); 2621 obj = SLOT(dvplabel); 2622 2623 if (!biba_dominate_effective(obj, subj)) 2624 return (EACCES); 2625 2626 return (0); 2627} 2628 2629static int 2630biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2631 struct label *dvplabel) 2632{ 2633 struct mac_biba *subj, *obj; 2634 2635 if (!biba_enabled) 2636 return (0); 2637 2638 subj = SLOT(cred->cr_label); 2639 obj = SLOT(dvplabel); 2640 2641 if (!biba_dominate_effective(obj, subj)) 2642 return (EACCES); 2643 2644 return (0); 2645} 2646 2647static int 2648biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2649 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2650{ 2651 struct mac_biba *subj, *obj; 2652 2653 if (!biba_enabled) 2654 return (0); 2655 2656 subj = SLOT(cred->cr_label); 2657 obj = SLOT(dvplabel); 2658 2659 if (!biba_dominate_effective(subj, obj)) 2660 return (EACCES); 2661 2662 return (0); 2663} 2664 2665static int 2666biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2667 struct label *vplabel, acl_type_t type) 2668{ 2669 struct mac_biba *subj, *obj; 2670 2671 if (!biba_enabled) 2672 return (0); 2673 2674 subj = SLOT(cred->cr_label); 2675 obj = SLOT(vplabel); 2676 2677 if (!biba_dominate_effective(subj, obj)) 2678 return (EACCES); 2679 2680 return (0); 2681} 2682 2683static int 2684biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2685 struct label *vplabel, int attrnamespace, const char *name) 2686{ 2687 struct mac_biba *subj, *obj; 2688 2689 if (!biba_enabled) 2690 return (0); 2691 2692 subj = SLOT(cred->cr_label); 2693 obj = SLOT(vplabel); 2694 2695 if (!biba_dominate_effective(subj, obj)) 2696 return (EACCES); 2697 2698 return (0); 2699} 2700 2701static int 2702biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2703 struct label *vplabel, struct image_params *imgp, 2704 struct label *execlabel) 2705{ 2706 struct mac_biba *subj, *obj, *exec; 2707 int error; 2708 2709 if (execlabel != NULL) { 2710 /* 2711 * We currently don't permit labels to be changed at 2712 * exec-time as part of Biba, so disallow non-NULL Biba label 2713 * elements in the execlabel. 2714 */ 2715 exec = SLOT(execlabel); 2716 error = biba_atmostflags(exec, 0); 2717 if (error) 2718 return (error); 2719 } 2720 2721 if (!biba_enabled) 2722 return (0); 2723 2724 subj = SLOT(cred->cr_label); 2725 obj = SLOT(vplabel); 2726 2727 if (!biba_dominate_effective(obj, subj)) 2728 return (EACCES); 2729 2730 return (0); 2731} 2732 2733static int 2734biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2735 struct label *vplabel, acl_type_t type) 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(vplabel); 2744 2745 if (!biba_dominate_effective(obj, subj)) 2746 return (EACCES); 2747 2748 return (0); 2749} 2750 2751static int 2752biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2753 struct label *vplabel, int attrnamespace, const char *name, 2754 struct uio *uio) 2755{ 2756 struct mac_biba *subj, *obj; 2757 2758 if (!biba_enabled) 2759 return (0); 2760 2761 subj = SLOT(cred->cr_label); 2762 obj = SLOT(vplabel); 2763 2764 if (!biba_dominate_effective(obj, subj)) 2765 return (EACCES); 2766 2767 return (0); 2768} 2769 2770static int 2771biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2772 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2773 struct componentname *cnp) 2774{ 2775 struct mac_biba *subj, *obj; 2776 2777 if (!biba_enabled) 2778 return (0); 2779 2780 subj = SLOT(cred->cr_label); 2781 obj = SLOT(dvplabel); 2782 2783 if (!biba_dominate_effective(subj, obj)) 2784 return (EACCES); 2785 2786 obj = SLOT(vplabel); 2787 2788 if (!biba_dominate_effective(subj, obj)) 2789 return (EACCES); 2790 2791 return (0); 2792} 2793 2794static int 2795biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2796 struct label *vplabel, int attrnamespace) 2797{ 2798 struct mac_biba *subj, *obj; 2799 2800 if (!biba_enabled) 2801 return (0); 2802 2803 subj = SLOT(cred->cr_label); 2804 obj = SLOT(vplabel); 2805 2806 if (!biba_dominate_effective(obj, subj)) 2807 return (EACCES); 2808 2809 return (0); 2810} 2811 2812static int 2813biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2814 struct label *dvplabel, struct componentname *cnp) 2815{ 2816 struct mac_biba *subj, *obj; 2817 2818 if (!biba_enabled) 2819 return (0); 2820 2821 subj = SLOT(cred->cr_label); 2822 obj = SLOT(dvplabel); 2823 2824 if (!biba_dominate_effective(obj, subj)) 2825 return (EACCES); 2826 2827 return (0); 2828} 2829 2830static int 2831biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2832 struct label *vplabel, int prot, int flags) 2833{ 2834 struct mac_biba *subj, *obj; 2835 2836 /* 2837 * Rely on the use of open()-time protections to handle 2838 * non-revocation cases. 2839 */ 2840 if (!biba_enabled || !revocation_enabled) 2841 return (0); 2842 2843 subj = SLOT(cred->cr_label); 2844 obj = SLOT(vplabel); 2845 2846 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2847 if (!biba_dominate_effective(obj, subj)) 2848 return (EACCES); 2849 } 2850 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2851 if (!biba_dominate_effective(subj, obj)) 2852 return (EACCES); 2853 } 2854 2855 return (0); 2856} 2857 2858static int 2859biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2860 struct label *vplabel, int acc_mode) 2861{ 2862 struct mac_biba *subj, *obj; 2863 2864 if (!biba_enabled) 2865 return (0); 2866 2867 subj = SLOT(cred->cr_label); 2868 obj = SLOT(vplabel); 2869 2870 /* XXX privilege override for admin? */ 2871 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2872 if (!biba_dominate_effective(obj, subj)) 2873 return (EACCES); 2874 } 2875 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2876 if (!biba_dominate_effective(subj, obj)) 2877 return (EACCES); 2878 } 2879 2880 return (0); 2881} 2882 2883static int 2884biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2885 struct vnode *vp, struct label *vplabel) 2886{ 2887 struct mac_biba *subj, *obj; 2888 2889 if (!biba_enabled || !revocation_enabled) 2890 return (0); 2891 2892 subj = SLOT(active_cred->cr_label); 2893 obj = SLOT(vplabel); 2894 2895 if (!biba_dominate_effective(obj, subj)) 2896 return (EACCES); 2897 2898 return (0); 2899} 2900 2901static int 2902biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2903 struct vnode *vp, struct label *vplabel) 2904{ 2905 struct mac_biba *subj, *obj; 2906 2907 if (!biba_enabled || !revocation_enabled) 2908 return (0); 2909 2910 subj = SLOT(active_cred->cr_label); 2911 obj = SLOT(vplabel); 2912 2913 if (!biba_dominate_effective(obj, subj)) 2914 return (EACCES); 2915 2916 return (0); 2917} 2918 2919static int 2920biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2921 struct label *dvplabel) 2922{ 2923 struct mac_biba *subj, *obj; 2924 2925 if (!biba_enabled) 2926 return (0); 2927 2928 subj = SLOT(cred->cr_label); 2929 obj = SLOT(dvplabel); 2930 2931 if (!biba_dominate_effective(obj, subj)) 2932 return (EACCES); 2933 2934 return (0); 2935} 2936 2937static int 2938biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2939 struct label *vplabel) 2940{ 2941 struct mac_biba *subj, *obj; 2942 2943 if (!biba_enabled) 2944 return (0); 2945 2946 subj = SLOT(cred->cr_label); 2947 obj = SLOT(vplabel); 2948 2949 if (!biba_dominate_effective(obj, subj)) 2950 return (EACCES); 2951 2952 return (0); 2953} 2954 2955static int 2956biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2957 struct label *vplabel, struct label *newlabel) 2958{ 2959 struct mac_biba *old, *new, *subj; 2960 int error; 2961 2962 old = SLOT(vplabel); 2963 new = SLOT(newlabel); 2964 subj = SLOT(cred->cr_label); 2965 2966 /* 2967 * If there is a Biba label update for the vnode, it must be a 2968 * effective label. 2969 */ 2970 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2971 if (error) 2972 return (error); 2973 2974 /* 2975 * To perform a relabel of the vnode (Biba label or not), Biba must 2976 * authorize the relabel. 2977 */ 2978 if (!biba_effective_in_range(old, subj)) 2979 return (EPERM); 2980 2981 /* 2982 * If the Biba label is to be changed, authorize as appropriate. 2983 */ 2984 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2985 /* 2986 * To change the Biba label on a vnode, the new vnode label 2987 * must be in the subject range. 2988 */ 2989 if (!biba_effective_in_range(new, subj)) 2990 return (EPERM); 2991 2992 /* 2993 * To change the Biba label on the vnode to be EQUAL, the 2994 * subject must have appropriate privilege. 2995 */ 2996 if (biba_contains_equal(new)) { 2997 error = biba_subject_privileged(subj); 2998 if (error) 2999 return (error); 3000 } 3001 } 3002 3003 return (0); 3004} 3005 3006static int 3007biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 3008 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3009 struct componentname *cnp) 3010{ 3011 struct mac_biba *subj, *obj; 3012 3013 if (!biba_enabled) 3014 return (0); 3015 3016 subj = SLOT(cred->cr_label); 3017 obj = SLOT(dvplabel); 3018 3019 if (!biba_dominate_effective(subj, obj)) 3020 return (EACCES); 3021 3022 obj = SLOT(vplabel); 3023 3024 if (!biba_dominate_effective(subj, obj)) 3025 return (EACCES); 3026 3027 return (0); 3028} 3029 3030static int 3031biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 3032 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3033 int samedir, struct componentname *cnp) 3034{ 3035 struct mac_biba *subj, *obj; 3036 3037 if (!biba_enabled) 3038 return (0); 3039 3040 subj = SLOT(cred->cr_label); 3041 obj = SLOT(dvplabel); 3042 3043 if (!biba_dominate_effective(subj, obj)) 3044 return (EACCES); 3045 3046 if (vp != NULL) { 3047 obj = SLOT(vplabel); 3048 3049 if (!biba_dominate_effective(subj, obj)) 3050 return (EACCES); 3051 } 3052 3053 return (0); 3054} 3055 3056static int 3057biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3058 struct label *vplabel) 3059{ 3060 struct mac_biba *subj, *obj; 3061 3062 if (!biba_enabled) 3063 return (0); 3064 3065 subj = SLOT(cred->cr_label); 3066 obj = SLOT(vplabel); 3067 3068 if (!biba_dominate_effective(subj, obj)) 3069 return (EACCES); 3070 3071 return (0); 3072} 3073 3074static int 3075biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 3076 struct label *vplabel, acl_type_t type, struct acl *acl) 3077{ 3078 struct mac_biba *subj, *obj; 3079 3080 if (!biba_enabled) 3081 return (0); 3082 3083 subj = SLOT(cred->cr_label); 3084 obj = SLOT(vplabel); 3085 3086 if (!biba_dominate_effective(subj, obj)) 3087 return (EACCES); 3088 3089 return (0); 3090} 3091 3092static int 3093biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3094 struct label *vplabel, int attrnamespace, const char *name, 3095 struct uio *uio) 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 /* XXX: protect the MAC EA in a special way? */ 3109 3110 return (0); 3111} 3112 3113static int 3114biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3115 struct label *vplabel, u_long flags) 3116{ 3117 struct mac_biba *subj, *obj; 3118 3119 if (!biba_enabled) 3120 return (0); 3121 3122 subj = SLOT(cred->cr_label); 3123 obj = SLOT(vplabel); 3124 3125 if (!biba_dominate_effective(subj, obj)) 3126 return (EACCES); 3127 3128 return (0); 3129} 3130 3131static int 3132biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3133 struct label *vplabel, mode_t mode) 3134{ 3135 struct mac_biba *subj, *obj; 3136 3137 if (!biba_enabled) 3138 return (0); 3139 3140 subj = SLOT(cred->cr_label); 3141 obj = SLOT(vplabel); 3142 3143 if (!biba_dominate_effective(subj, obj)) 3144 return (EACCES); 3145 3146 return (0); 3147} 3148 3149static int 3150biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3151 struct label *vplabel, uid_t uid, gid_t gid) 3152{ 3153 struct mac_biba *subj, *obj; 3154 3155 if (!biba_enabled) 3156 return (0); 3157 3158 subj = SLOT(cred->cr_label); 3159 obj = SLOT(vplabel); 3160 3161 if (!biba_dominate_effective(subj, obj)) 3162 return (EACCES); 3163 3164 return (0); 3165} 3166 3167static int 3168biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3169 struct label *vplabel, struct timespec atime, struct timespec mtime) 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 3185static int 3186biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3187 struct vnode *vp, struct label *vplabel) 3188{ 3189 struct mac_biba *subj, *obj; 3190 3191 if (!biba_enabled) 3192 return (0); 3193 3194 subj = SLOT(active_cred->cr_label); 3195 obj = SLOT(vplabel); 3196 3197 if (!biba_dominate_effective(obj, subj)) 3198 return (EACCES); 3199 3200 return (0); 3201} 3202 3203static int 3204biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3205 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3206 struct componentname *cnp) 3207{ 3208 struct mac_biba *subj, *obj; 3209 3210 if (!biba_enabled) 3211 return (0); 3212 3213 subj = SLOT(cred->cr_label); 3214 obj = SLOT(dvplabel); 3215 3216 if (!biba_dominate_effective(subj, obj)) 3217 return (EACCES); 3218 3219 obj = SLOT(vplabel); 3220 3221 if (!biba_dominate_effective(subj, obj)) 3222 return (EACCES); 3223 3224 return (0); 3225} 3226 3227static int 3228biba_vnode_check_write(struct ucred *active_cred, 3229 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3230{ 3231 struct mac_biba *subj, *obj; 3232 3233 if (!biba_enabled || !revocation_enabled) 3234 return (0); 3235 3236 subj = SLOT(active_cred->cr_label); 3237 obj = SLOT(vplabel); 3238 3239 if (!biba_dominate_effective(subj, obj)) 3240 return (EACCES); 3241 3242 return (0); 3243} 3244 3245static void 3246biba_syncache_create(struct label *label, struct inpcb *inp) 3247{ 3248 struct mac_biba *source, *dest; 3249 3250 source = SLOT(inp->inp_label); 3251 dest = SLOT(label); 3252 biba_copy_effective(source, dest); 3253} 3254 3255static void 3256biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 3257 struct label *mlabel) 3258{ 3259 struct mac_biba *source, *dest; 3260 3261 source = SLOT(sc_label); 3262 dest = SLOT(mlabel); 3263 biba_copy_effective(source, dest); 3264} 3265 3266static struct mac_policy_ops mac_biba_ops = 3267{ 3268 .mpo_init = biba_init, 3269 .mpo_bpfdesc_init_label = biba_init_label, 3270 .mpo_cred_init_label = biba_init_label, 3271 .mpo_devfs_init_label = biba_init_label, 3272 .mpo_ifnet_init_label = biba_init_label, 3273 .mpo_inpcb_init_label = biba_init_label_waitcheck, 3274 .mpo_syncache_init_label = biba_init_label_waitcheck, 3275 .mpo_sysvmsg_init_label = biba_init_label, 3276 .mpo_sysvmsq_init_label = biba_init_label, 3277 .mpo_sysvsem_init_label = biba_init_label, 3278 .mpo_sysvshm_init_label = biba_init_label, 3279 .mpo_ipq_init_label = biba_init_label_waitcheck, 3280 .mpo_mbuf_init_label = biba_init_label_waitcheck, 3281 .mpo_mount_init_label = biba_init_label, 3282 .mpo_pipe_init_label = biba_init_label, 3283 .mpo_posixsem_init_label = biba_init_label, 3284 .mpo_socket_init_label = biba_init_label_waitcheck, 3285 .mpo_socketpeer_init_label = biba_init_label_waitcheck, 3286 .mpo_syncache_create = biba_syncache_create, 3287 .mpo_vnode_init_label = biba_init_label, 3288 .mpo_bpfdesc_destroy_label = biba_destroy_label, 3289 .mpo_cred_destroy_label = biba_destroy_label, 3290 .mpo_devfs_destroy_label = biba_destroy_label, 3291 .mpo_ifnet_destroy_label = biba_destroy_label, 3292 .mpo_inpcb_destroy_label = biba_destroy_label, 3293 .mpo_syncache_destroy_label = biba_destroy_label, 3294 .mpo_sysvmsg_destroy_label = biba_destroy_label, 3295 .mpo_sysvmsq_destroy_label = biba_destroy_label, 3296 .mpo_sysvsem_destroy_label = biba_destroy_label, 3297 .mpo_sysvshm_destroy_label = biba_destroy_label, 3298 .mpo_ipq_destroy_label = biba_destroy_label, 3299 .mpo_mbuf_destroy_label = biba_destroy_label, 3300 .mpo_mount_destroy_label = biba_destroy_label, 3301 .mpo_pipe_destroy_label = biba_destroy_label, 3302 .mpo_posixsem_destroy_label = biba_destroy_label, 3303 .mpo_socket_destroy_label = biba_destroy_label, 3304 .mpo_socketpeer_destroy_label = biba_destroy_label, 3305 .mpo_vnode_destroy_label = biba_destroy_label, 3306 .mpo_cred_copy_label = biba_copy_label, 3307 .mpo_ifnet_copy_label = biba_copy_label, 3308 .mpo_mbuf_copy_label = biba_copy_label, 3309 .mpo_pipe_copy_label = biba_copy_label, 3310 .mpo_socket_copy_label = biba_copy_label, 3311 .mpo_vnode_copy_label = biba_copy_label, 3312 .mpo_cred_externalize_label = biba_externalize_label, 3313 .mpo_ifnet_externalize_label = biba_externalize_label, 3314 .mpo_pipe_externalize_label = biba_externalize_label, 3315 .mpo_socket_externalize_label = biba_externalize_label, 3316 .mpo_socketpeer_externalize_label = biba_externalize_label, 3317 .mpo_vnode_externalize_label = biba_externalize_label, 3318 .mpo_cred_internalize_label = biba_internalize_label, 3319 .mpo_ifnet_internalize_label = biba_internalize_label, 3320 .mpo_pipe_internalize_label = biba_internalize_label, 3321 .mpo_socket_internalize_label = biba_internalize_label, 3322 .mpo_vnode_internalize_label = biba_internalize_label, 3323 .mpo_devfs_create_device = biba_devfs_create_device, 3324 .mpo_devfs_create_directory = biba_devfs_create_directory, 3325 .mpo_devfs_create_symlink = biba_devfs_create_symlink, 3326 .mpo_mount_create = biba_mount_create, 3327 .mpo_vnode_relabel = biba_vnode_relabel, 3328 .mpo_devfs_update = biba_devfs_update, 3329 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, 3330 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, 3331 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, 3332 .mpo_vnode_create_extattr = biba_vnode_create_extattr, 3333 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, 3334 .mpo_socket_create_mbuf = biba_socket_create_mbuf, 3335 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf, 3336 .mpo_pipe_create = biba_pipe_create, 3337 .mpo_posixsem_create = biba_posixsem_create, 3338 .mpo_socket_create = biba_socket_create, 3339 .mpo_socket_newconn = biba_socket_newconn, 3340 .mpo_pipe_relabel = biba_pipe_relabel, 3341 .mpo_socket_relabel = biba_socket_relabel, 3342 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, 3343 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, 3344 .mpo_bpfdesc_create = biba_bpfdesc_create, 3345 .mpo_ipq_reassemble = biba_ipq_reassemble, 3346 .mpo_netinet_fragment = biba_netinet_fragment, 3347 .mpo_ifnet_create = biba_ifnet_create, 3348 .mpo_inpcb_create = biba_inpcb_create, 3349 .mpo_sysvmsg_create = biba_sysvmsg_create, 3350 .mpo_sysvmsq_create = biba_sysvmsq_create, 3351 .mpo_sysvsem_create = biba_sysvsem_create, 3352 .mpo_sysvshm_create = biba_sysvshm_create, 3353 .mpo_ipq_create = biba_ipq_create, 3354 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, 3355 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, 3356 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, 3357 .mpo_ipq_match = biba_ipq_match, 3358 .mpo_ifnet_relabel = biba_ifnet_relabel, 3359 .mpo_ipq_update = biba_ipq_update, 3360 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, 3361 .mpo_proc_create_swapper = biba_proc_create_swapper, 3362 .mpo_proc_create_init = biba_proc_create_init, 3363 .mpo_proc_associate_nfsd = biba_proc_associate_nfsd, 3364 .mpo_cred_relabel = biba_cred_relabel, 3365 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3366 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3367 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3368 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3369 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3370 .mpo_cred_check_relabel = biba_cred_check_relabel, 3371 .mpo_cred_check_visible = biba_cred_check_visible, 3372 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3373 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3374 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3375 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3376 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3377 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3378 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3379 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3380 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3381 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3382 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3383 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3384 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3385 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3386 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3387 .mpo_kld_check_load = biba_kld_check_load, 3388 .mpo_mount_check_stat = biba_mount_check_stat, 3389 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3390 .mpo_pipe_check_poll = biba_pipe_check_poll, 3391 .mpo_pipe_check_read = biba_pipe_check_read, 3392 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3393 .mpo_pipe_check_stat = biba_pipe_check_stat, 3394 .mpo_pipe_check_write = biba_pipe_check_write, 3395 .mpo_posixsem_check_destroy = biba_posixsem_check_write, 3396 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3397 .mpo_posixsem_check_open = biba_posixsem_check_write, 3398 .mpo_posixsem_check_post = biba_posixsem_check_write, 3399 .mpo_posixsem_check_unlink = biba_posixsem_check_write, 3400 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3401 .mpo_proc_check_debug = biba_proc_check_debug, 3402 .mpo_proc_check_sched = biba_proc_check_sched, 3403 .mpo_proc_check_signal = biba_proc_check_signal, 3404 .mpo_socket_check_deliver = biba_socket_check_deliver, 3405 .mpo_socket_check_relabel = biba_socket_check_relabel, 3406 .mpo_socket_check_visible = biba_socket_check_visible, 3407 .mpo_system_check_acct = biba_system_check_acct, 3408 .mpo_system_check_auditctl = biba_system_check_auditctl, 3409 .mpo_system_check_auditon = biba_system_check_auditon, 3410 .mpo_system_check_swapon = biba_system_check_swapon, 3411 .mpo_system_check_swapoff = biba_system_check_swapoff, 3412 .mpo_system_check_sysctl = biba_system_check_sysctl, 3413 .mpo_vnode_check_access = biba_vnode_check_open, 3414 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3415 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3416 .mpo_vnode_check_create = biba_vnode_check_create, 3417 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3418 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3419 .mpo_vnode_check_exec = biba_vnode_check_exec, 3420 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3421 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3422 .mpo_vnode_check_link = biba_vnode_check_link, 3423 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3424 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3425 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3426 .mpo_vnode_check_open = biba_vnode_check_open, 3427 .mpo_vnode_check_poll = biba_vnode_check_poll, 3428 .mpo_vnode_check_read = biba_vnode_check_read, 3429 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3430 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3431 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3432 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3433 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3434 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3435 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3436 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3437 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3438 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3439 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3440 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3441 .mpo_vnode_check_stat = biba_vnode_check_stat, 3442 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3443 .mpo_vnode_check_write = biba_vnode_check_write, 3444 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send, 3445 .mpo_netinet_arp_send = biba_netinet_arp_send, 3446 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply, 3447 .mpo_netinet_firewall_send = biba_netinet_firewall_send, 3448 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply, 3449 .mpo_netinet_igmp_send = biba_netinet_igmp_send, 3450 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send, 3451 .mpo_priv_check = biba_priv_check, 3452}; 3453 3454MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3455 MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &biba_slot); 3456