mac_biba.c revision 173095
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 173095 2007-10-28 15:55:23Z 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 void 1295biba_mbuf_create_multicast_encap(struct mbuf *m, struct label *mlabel, 1296 struct ifnet *ifp, struct label *ifplabel, struct mbuf *mnew, 1297 struct label *mnewlabel) 1298{ 1299 struct mac_biba *source, *dest; 1300 1301 source = SLOT(mlabel); 1302 dest = SLOT(mnewlabel); 1303 1304 biba_copy_effective(source, dest); 1305} 1306 1307static void 1308biba_mbuf_create_netlayer(struct mbuf *m, struct label *mlabel, 1309 struct mbuf *newm, struct label *mnewlabel) 1310{ 1311 struct mac_biba *source, *dest; 1312 1313 source = SLOT(mlabel); 1314 dest = SLOT(mnewlabel); 1315 1316 biba_copy_effective(source, dest); 1317} 1318 1319static int 1320biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1321 struct label *ipqlabel) 1322{ 1323 struct mac_biba *a, *b; 1324 1325 a = SLOT(ipqlabel); 1326 b = SLOT(mlabel); 1327 1328 return (biba_equal_effective(a, b)); 1329} 1330 1331static void 1332biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1333 struct label *ifplabel, struct label *newlabel) 1334{ 1335 struct mac_biba *source, *dest; 1336 1337 source = SLOT(newlabel); 1338 dest = SLOT(ifplabel); 1339 1340 biba_copy(source, dest); 1341} 1342 1343static void 1344biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1345 struct label *ipqlabel) 1346{ 1347 1348 /* NOOP: we only accept matching labels, so no need to update */ 1349} 1350 1351static void 1352biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1353 struct inpcb *inp, struct label *inplabel) 1354{ 1355 struct mac_biba *source, *dest; 1356 1357 source = SLOT(solabel); 1358 dest = SLOT(inplabel); 1359 1360 biba_copy(source, dest); 1361} 1362 1363static void 1364biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1365 struct mbuf *m, struct label *mlabel) 1366{ 1367 struct mac_biba *dest; 1368 1369 dest = SLOT(mlabel); 1370 1371 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1372} 1373 1374static void 1375biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1376 struct mbuf *m, struct label *mlabel) 1377{ 1378 struct mac_biba *dest; 1379 1380 dest = SLOT(mlabel); 1381 1382 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1383} 1384 1385static void 1386biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1387{ 1388 struct mac_biba *dest; 1389 1390 dest = SLOT(mlabel); 1391 1392 /* XXX: where is the label for the firewall really coming from? */ 1393 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1394} 1395 1396static void 1397biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1398 struct mbuf *m, struct label *mlabel) 1399{ 1400 struct mac_biba *dest; 1401 1402 dest = SLOT(mlabel); 1403 1404 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1405} 1406 1407static void 1408biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1409 struct mbuf *m, struct label *mlabel) 1410{ 1411 struct mac_biba *dest; 1412 1413 dest = SLOT(mlabel); 1414 1415 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1416} 1417 1418/* 1419 * Labeling event operations: processes. 1420 */ 1421static void 1422biba_proc_create_swapper(struct ucred *cred) 1423{ 1424 struct mac_biba *dest; 1425 1426 dest = SLOT(cred->cr_label); 1427 1428 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1429 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1430 0, NULL); 1431} 1432 1433static void 1434biba_proc_create_init(struct ucred *cred) 1435{ 1436 struct mac_biba *dest; 1437 1438 dest = SLOT(cred->cr_label); 1439 1440 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1441 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1442 0, NULL); 1443} 1444 1445static void 1446biba_proc_associate_nfsd(struct ucred *cred) 1447{ 1448 struct mac_biba *label; 1449 1450 label = SLOT(cred->cr_label); 1451 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); 1452 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1453 0, NULL); 1454} 1455 1456static void 1457biba_cred_relabel(struct ucred *cred, struct label *newlabel) 1458{ 1459 struct mac_biba *source, *dest; 1460 1461 source = SLOT(newlabel); 1462 dest = SLOT(cred->cr_label); 1463 1464 biba_copy(source, dest); 1465} 1466 1467/* 1468 * Label cleanup/flush operations 1469 */ 1470static void 1471biba_sysvmsg_cleanup(struct label *msglabel) 1472{ 1473 1474 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 1475} 1476 1477static void 1478biba_sysvmsq_cleanup(struct label *msqlabel) 1479{ 1480 1481 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 1482} 1483 1484static void 1485biba_sysvsem_cleanup(struct label *semalabel) 1486{ 1487 1488 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 1489} 1490 1491static void 1492biba_sysvshm_cleanup(struct label *shmlabel) 1493{ 1494 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 1495} 1496 1497/* 1498 * Access control checks. 1499 */ 1500static int 1501biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 1502 struct ifnet *ifp, struct label *ifplabel) 1503{ 1504 struct mac_biba *a, *b; 1505 1506 if (!biba_enabled) 1507 return (0); 1508 1509 a = SLOT(dlabel); 1510 b = SLOT(ifplabel); 1511 1512 if (biba_equal_effective(a, b)) 1513 return (0); 1514 return (EACCES); 1515} 1516 1517static int 1518biba_cred_check_relabel(struct ucred *cred, struct label *newlabel) 1519{ 1520 struct mac_biba *subj, *new; 1521 int error; 1522 1523 subj = SLOT(cred->cr_label); 1524 new = SLOT(newlabel); 1525 1526 /* 1527 * If there is a Biba label update for the credential, it may 1528 * be an update of the effective, range, or both. 1529 */ 1530 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1531 if (error) 1532 return (error); 1533 1534 /* 1535 * If the Biba label is to be changed, authorize as appropriate. 1536 */ 1537 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1538 /* 1539 * If the change request modifies both the Biba label 1540 * effective and range, check that the new effective will be 1541 * in the new range. 1542 */ 1543 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 1544 MAC_BIBA_FLAGS_BOTH && 1545 !biba_effective_in_range(new, new)) 1546 return (EINVAL); 1547 1548 /* 1549 * To change the Biba effective label on a credential, the 1550 * new effective label must be in the current range. 1551 */ 1552 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && 1553 !biba_effective_in_range(new, subj)) 1554 return (EPERM); 1555 1556 /* 1557 * To change the Biba range on a credential, the new range 1558 * label must be in the current range. 1559 */ 1560 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1561 !biba_range_in_range(new, subj)) 1562 return (EPERM); 1563 1564 /* 1565 * To have EQUAL in any component of the new credential Biba 1566 * label, the subject must already have EQUAL in their label. 1567 */ 1568 if (biba_contains_equal(new)) { 1569 error = biba_subject_privileged(subj); 1570 if (error) 1571 return (error); 1572 } 1573 } 1574 1575 return (0); 1576} 1577 1578static int 1579biba_cred_check_visible(struct ucred *u1, struct ucred *u2) 1580{ 1581 struct mac_biba *subj, *obj; 1582 1583 if (!biba_enabled) 1584 return (0); 1585 1586 subj = SLOT(u1->cr_label); 1587 obj = SLOT(u2->cr_label); 1588 1589 /* XXX: range */ 1590 if (!biba_dominate_effective(obj, subj)) 1591 return (ESRCH); 1592 1593 return (0); 1594} 1595 1596static int 1597biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1598 struct label *ifplabel, struct label *newlabel) 1599{ 1600 struct mac_biba *subj, *new; 1601 int error; 1602 1603 subj = SLOT(cred->cr_label); 1604 new = SLOT(newlabel); 1605 1606 /* 1607 * If there is a Biba label update for the interface, it may be an 1608 * update of the effective, range, or both. 1609 */ 1610 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1611 if (error) 1612 return (error); 1613 1614 /* 1615 * Relabling network interfaces requires Biba privilege. 1616 */ 1617 error = biba_subject_privileged(subj); 1618 if (error) 1619 return (error); 1620 1621 return (0); 1622} 1623 1624static int 1625biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1626 struct mbuf *m, struct label *mlabel) 1627{ 1628 struct mac_biba *p, *i; 1629 1630 if (!biba_enabled) 1631 return (0); 1632 1633 p = SLOT(mlabel); 1634 i = SLOT(ifplabel); 1635 1636 return (biba_effective_in_range(p, i) ? 0 : EACCES); 1637} 1638 1639static int 1640biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1641 struct mbuf *m, struct label *mlabel) 1642{ 1643 struct mac_biba *p, *i; 1644 1645 if (!biba_enabled) 1646 return (0); 1647 1648 p = SLOT(mlabel); 1649 i = SLOT(inplabel); 1650 1651 return (biba_equal_effective(p, i) ? 0 : EACCES); 1652} 1653 1654static int 1655biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 1656 struct label *msglabel) 1657{ 1658 struct mac_biba *subj, *obj; 1659 1660 if (!biba_enabled) 1661 return (0); 1662 1663 subj = SLOT(cred->cr_label); 1664 obj = SLOT(msglabel); 1665 1666 if (!biba_dominate_effective(obj, subj)) 1667 return (EACCES); 1668 1669 return (0); 1670} 1671 1672static int 1673biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 1674 struct label *msglabel) 1675{ 1676 struct mac_biba *subj, *obj; 1677 1678 if (!biba_enabled) 1679 return (0); 1680 1681 subj = SLOT(cred->cr_label); 1682 obj = SLOT(msglabel); 1683 1684 if (!biba_dominate_effective(subj, obj)) 1685 return (EACCES); 1686 1687 return (0); 1688} 1689 1690static int 1691biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 1692 struct label *msqklabel) 1693{ 1694 struct mac_biba *subj, *obj; 1695 1696 if (!biba_enabled) 1697 return (0); 1698 1699 subj = SLOT(cred->cr_label); 1700 obj = SLOT(msqklabel); 1701 1702 if (!biba_dominate_effective(obj, subj)) 1703 return (EACCES); 1704 1705 return (0); 1706} 1707 1708static int 1709biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 1710 struct label *msqklabel) 1711{ 1712 struct mac_biba *subj, *obj; 1713 1714 if (!biba_enabled) 1715 return (0); 1716 1717 subj = SLOT(cred->cr_label); 1718 obj = SLOT(msqklabel); 1719 1720 if (!biba_dominate_effective(subj, obj)) 1721 return (EACCES); 1722 1723 return (0); 1724} 1725 1726static int 1727biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 1728 struct label *msqklabel) 1729{ 1730 struct mac_biba *subj, *obj; 1731 1732 if (!biba_enabled) 1733 return (0); 1734 1735 subj = SLOT(cred->cr_label); 1736 obj = SLOT(msqklabel); 1737 1738 if (!biba_dominate_effective(obj, subj)) 1739 return (EACCES); 1740 1741 return (0); 1742} 1743 1744static int 1745biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 1746 struct label *msqklabel, int cmd) 1747{ 1748 struct mac_biba *subj, *obj; 1749 1750 if (!biba_enabled) 1751 return (0); 1752 1753 subj = SLOT(cred->cr_label); 1754 obj = SLOT(msqklabel); 1755 1756 switch(cmd) { 1757 case IPC_RMID: 1758 case IPC_SET: 1759 if (!biba_dominate_effective(subj, obj)) 1760 return (EACCES); 1761 break; 1762 1763 case IPC_STAT: 1764 if (!biba_dominate_effective(obj, subj)) 1765 return (EACCES); 1766 break; 1767 1768 default: 1769 return (EACCES); 1770 } 1771 1772 return (0); 1773} 1774 1775static int 1776biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 1777 struct label *semaklabel, int cmd) 1778{ 1779 struct mac_biba *subj, *obj; 1780 1781 if (!biba_enabled) 1782 return (0); 1783 1784 subj = SLOT(cred->cr_label); 1785 obj = SLOT(semaklabel); 1786 1787 switch(cmd) { 1788 case IPC_RMID: 1789 case IPC_SET: 1790 case SETVAL: 1791 case SETALL: 1792 if (!biba_dominate_effective(subj, obj)) 1793 return (EACCES); 1794 break; 1795 1796 case IPC_STAT: 1797 case GETVAL: 1798 case GETPID: 1799 case GETNCNT: 1800 case GETZCNT: 1801 case GETALL: 1802 if (!biba_dominate_effective(obj, subj)) 1803 return (EACCES); 1804 break; 1805 1806 default: 1807 return (EACCES); 1808 } 1809 1810 return (0); 1811} 1812 1813static int 1814biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 1815 struct label *semaklabel) 1816{ 1817 struct mac_biba *subj, *obj; 1818 1819 if (!biba_enabled) 1820 return (0); 1821 1822 subj = SLOT(cred->cr_label); 1823 obj = SLOT(semaklabel); 1824 1825 if (!biba_dominate_effective(obj, subj)) 1826 return (EACCES); 1827 1828 return (0); 1829} 1830 1831static int 1832biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 1833 struct label *semaklabel, size_t accesstype) 1834{ 1835 struct mac_biba *subj, *obj; 1836 1837 if (!biba_enabled) 1838 return (0); 1839 1840 subj = SLOT(cred->cr_label); 1841 obj = SLOT(semaklabel); 1842 1843 if (accesstype & SEM_R) 1844 if (!biba_dominate_effective(obj, subj)) 1845 return (EACCES); 1846 1847 if (accesstype & SEM_A) 1848 if (!biba_dominate_effective(subj, obj)) 1849 return (EACCES); 1850 1851 return (0); 1852} 1853 1854static int 1855biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 1856 struct label *shmseglabel, int shmflg) 1857{ 1858 struct mac_biba *subj, *obj; 1859 1860 if (!biba_enabled) 1861 return (0); 1862 1863 subj = SLOT(cred->cr_label); 1864 obj = SLOT(shmseglabel); 1865 1866 if (!biba_dominate_effective(obj, subj)) 1867 return (EACCES); 1868 if ((shmflg & SHM_RDONLY) == 0) { 1869 if (!biba_dominate_effective(subj, obj)) 1870 return (EACCES); 1871 } 1872 1873 return (0); 1874} 1875 1876static int 1877biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 1878 struct label *shmseglabel, int cmd) 1879{ 1880 struct mac_biba *subj, *obj; 1881 1882 if (!biba_enabled) 1883 return (0); 1884 1885 subj = SLOT(cred->cr_label); 1886 obj = SLOT(shmseglabel); 1887 1888 switch(cmd) { 1889 case IPC_RMID: 1890 case IPC_SET: 1891 if (!biba_dominate_effective(subj, obj)) 1892 return (EACCES); 1893 break; 1894 1895 case IPC_STAT: 1896 case SHM_STAT: 1897 if (!biba_dominate_effective(obj, subj)) 1898 return (EACCES); 1899 break; 1900 1901 default: 1902 return (EACCES); 1903 } 1904 1905 return (0); 1906} 1907 1908static int 1909biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 1910 struct label *shmseglabel, int shmflg) 1911{ 1912 struct mac_biba *subj, *obj; 1913 1914 if (!biba_enabled) 1915 return (0); 1916 1917 subj = SLOT(cred->cr_label); 1918 obj = SLOT(shmseglabel); 1919 1920 if (!biba_dominate_effective(obj, subj)) 1921 return (EACCES); 1922 1923 return (0); 1924} 1925 1926static int 1927biba_kld_check_load(struct ucred *cred, struct vnode *vp, 1928 struct label *vplabel) 1929{ 1930 struct mac_biba *subj, *obj; 1931 int error; 1932 1933 if (!biba_enabled) 1934 return (0); 1935 1936 subj = SLOT(cred->cr_label); 1937 1938 error = biba_subject_privileged(subj); 1939 if (error) 1940 return (error); 1941 1942 obj = SLOT(vplabel); 1943 if (!biba_high_effective(obj)) 1944 return (EACCES); 1945 1946 return (0); 1947} 1948 1949static int 1950biba_mount_check_stat(struct ucred *cred, struct mount *mp, 1951 struct label *mplabel) 1952{ 1953 struct mac_biba *subj, *obj; 1954 1955 if (!biba_enabled) 1956 return (0); 1957 1958 subj = SLOT(cred->cr_label); 1959 obj = SLOT(mplabel); 1960 1961 if (!biba_dominate_effective(obj, subj)) 1962 return (EACCES); 1963 1964 return (0); 1965} 1966 1967static int 1968biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1969 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1970{ 1971 1972 if(!biba_enabled) 1973 return (0); 1974 1975 /* XXX: This will be implemented soon... */ 1976 1977 return (0); 1978} 1979 1980static int 1981biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1982 struct label *pplabel) 1983{ 1984 struct mac_biba *subj, *obj; 1985 1986 if (!biba_enabled) 1987 return (0); 1988 1989 subj = SLOT(cred->cr_label); 1990 obj = SLOT(pplabel); 1991 1992 if (!biba_dominate_effective(obj, subj)) 1993 return (EACCES); 1994 1995 return (0); 1996} 1997 1998static int 1999biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, 2000 struct label *pplabel) 2001{ 2002 struct mac_biba *subj, *obj; 2003 2004 if (!biba_enabled) 2005 return (0); 2006 2007 subj = SLOT(cred->cr_label); 2008 obj = SLOT(pplabel); 2009 2010 if (!biba_dominate_effective(obj, subj)) 2011 return (EACCES); 2012 2013 return (0); 2014} 2015 2016static int 2017biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 2018 struct label *pplabel, struct label *newlabel) 2019{ 2020 struct mac_biba *subj, *obj, *new; 2021 int error; 2022 2023 new = SLOT(newlabel); 2024 subj = SLOT(cred->cr_label); 2025 obj = SLOT(pplabel); 2026 2027 /* 2028 * If there is a Biba label update for a pipe, it must be a effective 2029 * update. 2030 */ 2031 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2032 if (error) 2033 return (error); 2034 2035 /* 2036 * To perform a relabel of a pipe (Biba label or not), Biba must 2037 * authorize the relabel. 2038 */ 2039 if (!biba_effective_in_range(obj, subj)) 2040 return (EPERM); 2041 2042 /* 2043 * If the Biba label is to be changed, authorize as appropriate. 2044 */ 2045 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2046 /* 2047 * To change the Biba label on a pipe, the new pipe label 2048 * must be in the subject range. 2049 */ 2050 if (!biba_effective_in_range(new, subj)) 2051 return (EPERM); 2052 2053 /* 2054 * To change the Biba label on a pipe to be EQUAL, the 2055 * subject must have appropriate privilege. 2056 */ 2057 if (biba_contains_equal(new)) { 2058 error = biba_subject_privileged(subj); 2059 if (error) 2060 return (error); 2061 } 2062 } 2063 2064 return (0); 2065} 2066 2067static int 2068biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 2069 struct label *pplabel) 2070{ 2071 struct mac_biba *subj, *obj; 2072 2073 if (!biba_enabled) 2074 return (0); 2075 2076 subj = SLOT(cred->cr_label); 2077 obj = SLOT(pplabel); 2078 2079 if (!biba_dominate_effective(obj, subj)) 2080 return (EACCES); 2081 2082 return (0); 2083} 2084 2085static int 2086biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, 2087 struct label *pplabel) 2088{ 2089 struct mac_biba *subj, *obj; 2090 2091 if (!biba_enabled) 2092 return (0); 2093 2094 subj = SLOT(cred->cr_label); 2095 obj = SLOT(pplabel); 2096 2097 if (!biba_dominate_effective(subj, obj)) 2098 return (EACCES); 2099 2100 return (0); 2101} 2102 2103static int 2104biba_posixsem_check_write(struct ucred *cred, struct ksem *ks, 2105 struct label *kslabel) 2106{ 2107 struct mac_biba *subj, *obj; 2108 2109 if (!biba_enabled) 2110 return (0); 2111 2112 subj = SLOT(cred->cr_label); 2113 obj = SLOT(kslabel); 2114 2115 if (!biba_dominate_effective(subj, obj)) 2116 return (EACCES); 2117 2118 return (0); 2119} 2120 2121static int 2122biba_posixsem_check_rdonly(struct ucred *cred, struct ksem *ks, 2123 struct label *kslabel) 2124{ 2125 struct mac_biba *subj, *obj; 2126 2127 if (!biba_enabled) 2128 return (0); 2129 2130 subj = SLOT(cred->cr_label); 2131 obj = SLOT(kslabel); 2132 2133 if (!biba_dominate_effective(obj, subj)) 2134 return (EACCES); 2135 2136 return (0); 2137} 2138 2139static int 2140biba_proc_check_debug(struct ucred *cred, struct proc *p) 2141{ 2142 struct mac_biba *subj, *obj; 2143 2144 if (!biba_enabled) 2145 return (0); 2146 2147 subj = SLOT(cred->cr_label); 2148 obj = SLOT(p->p_ucred->cr_label); 2149 2150 /* XXX: range checks */ 2151 if (!biba_dominate_effective(obj, subj)) 2152 return (ESRCH); 2153 if (!biba_dominate_effective(subj, obj)) 2154 return (EACCES); 2155 2156 return (0); 2157} 2158 2159static int 2160biba_proc_check_sched(struct ucred *cred, struct proc *p) 2161{ 2162 struct mac_biba *subj, *obj; 2163 2164 if (!biba_enabled) 2165 return (0); 2166 2167 subj = SLOT(cred->cr_label); 2168 obj = SLOT(p->p_ucred->cr_label); 2169 2170 /* XXX: range checks */ 2171 if (!biba_dominate_effective(obj, subj)) 2172 return (ESRCH); 2173 if (!biba_dominate_effective(subj, obj)) 2174 return (EACCES); 2175 2176 return (0); 2177} 2178 2179static int 2180biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 2181{ 2182 struct mac_biba *subj, *obj; 2183 2184 if (!biba_enabled) 2185 return (0); 2186 2187 subj = SLOT(cred->cr_label); 2188 obj = SLOT(p->p_ucred->cr_label); 2189 2190 /* XXX: range checks */ 2191 if (!biba_dominate_effective(obj, subj)) 2192 return (ESRCH); 2193 if (!biba_dominate_effective(subj, obj)) 2194 return (EACCES); 2195 2196 return (0); 2197} 2198 2199static int 2200biba_socket_check_deliver(struct socket *so, struct label *solabel, 2201 struct mbuf *m, struct label *mlabel) 2202{ 2203 struct mac_biba *p, *s; 2204 2205 if (!biba_enabled) 2206 return (0); 2207 2208 p = SLOT(mlabel); 2209 s = SLOT(solabel); 2210 2211 return (biba_equal_effective(p, s) ? 0 : EACCES); 2212} 2213 2214static int 2215biba_socket_check_relabel(struct ucred *cred, struct socket *so, 2216 struct label *solabel, struct label *newlabel) 2217{ 2218 struct mac_biba *subj, *obj, *new; 2219 int error; 2220 2221 new = SLOT(newlabel); 2222 subj = SLOT(cred->cr_label); 2223 obj = SLOT(solabel); 2224 2225 /* 2226 * If there is a Biba label update for the socket, it may be an 2227 * update of effective. 2228 */ 2229 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2230 if (error) 2231 return (error); 2232 2233 /* 2234 * To relabel a socket, the old socket effective must be in the 2235 * subject range. 2236 */ 2237 if (!biba_effective_in_range(obj, subj)) 2238 return (EPERM); 2239 2240 /* 2241 * If the Biba label is to be changed, authorize as appropriate. 2242 */ 2243 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2244 /* 2245 * To relabel a socket, the new socket effective must be in 2246 * the subject range. 2247 */ 2248 if (!biba_effective_in_range(new, subj)) 2249 return (EPERM); 2250 2251 /* 2252 * To change the Biba label on the socket to contain EQUAL, 2253 * the subject must have appropriate privilege. 2254 */ 2255 if (biba_contains_equal(new)) { 2256 error = biba_subject_privileged(subj); 2257 if (error) 2258 return (error); 2259 } 2260 } 2261 2262 return (0); 2263} 2264 2265static int 2266biba_socket_check_visible(struct ucred *cred, struct socket *so, 2267 struct label *solabel) 2268{ 2269 struct mac_biba *subj, *obj; 2270 2271 if (!biba_enabled) 2272 return (0); 2273 2274 subj = SLOT(cred->cr_label); 2275 obj = SLOT(solabel); 2276 2277 if (!biba_dominate_effective(obj, subj)) 2278 return (ENOENT); 2279 2280 return (0); 2281} 2282 2283/* 2284 * Some system privileges are allowed regardless of integrity grade; others 2285 * are allowed only when running with privilege with respect to the Biba 2286 * policy as they might otherwise allow bypassing of the integrity policy. 2287 */ 2288static int 2289biba_priv_check(struct ucred *cred, int priv) 2290{ 2291 struct mac_biba *subj; 2292 int error; 2293 2294 if (!biba_enabled) 2295 return (0); 2296 2297 /* 2298 * Exempt only specific privileges from the Biba integrity policy. 2299 */ 2300 switch (priv) { 2301 case PRIV_KTRACE: 2302 case PRIV_MSGBUF: 2303 2304 /* 2305 * Allow processes to manipulate basic process audit properties, and 2306 * to submit audit records. 2307 */ 2308 case PRIV_AUDIT_GETAUDIT: 2309 case PRIV_AUDIT_SETAUDIT: 2310 case PRIV_AUDIT_SUBMIT: 2311 2312 /* 2313 * Allow processes to manipulate their regular UNIX credentials. 2314 */ 2315 case PRIV_CRED_SETUID: 2316 case PRIV_CRED_SETEUID: 2317 case PRIV_CRED_SETGID: 2318 case PRIV_CRED_SETEGID: 2319 case PRIV_CRED_SETGROUPS: 2320 case PRIV_CRED_SETREUID: 2321 case PRIV_CRED_SETREGID: 2322 case PRIV_CRED_SETRESUID: 2323 case PRIV_CRED_SETRESGID: 2324 2325 /* 2326 * Allow processes to perform system monitoring. 2327 */ 2328 case PRIV_SEEOTHERGIDS: 2329 case PRIV_SEEOTHERUIDS: 2330 break; 2331 2332 /* 2333 * Allow access to general process debugging facilities. We 2334 * separately control debugging based on MAC label. 2335 */ 2336 case PRIV_DEBUG_DIFFCRED: 2337 case PRIV_DEBUG_SUGID: 2338 case PRIV_DEBUG_UNPRIV: 2339 2340 /* 2341 * Allow manipulating jails. 2342 */ 2343 case PRIV_JAIL_ATTACH: 2344 2345 /* 2346 * Allow privilege with respect to the Partition policy, but not the 2347 * Privs policy. 2348 */ 2349 case PRIV_MAC_PARTITION: 2350 2351 /* 2352 * Allow privilege with respect to process resource limits and login 2353 * context. 2354 */ 2355 case PRIV_PROC_LIMIT: 2356 case PRIV_PROC_SETLOGIN: 2357 case PRIV_PROC_SETRLIMIT: 2358 2359 /* 2360 * Allow System V and POSIX IPC privileges. 2361 */ 2362 case PRIV_IPC_READ: 2363 case PRIV_IPC_WRITE: 2364 case PRIV_IPC_ADMIN: 2365 case PRIV_IPC_MSGSIZE: 2366 case PRIV_MQ_ADMIN: 2367 2368 /* 2369 * Allow certain scheduler manipulations -- possibly this should be 2370 * controlled by more fine-grained policy, as potentially low 2371 * integrity processes can deny CPU to higher integrity ones. 2372 */ 2373 case PRIV_SCHED_DIFFCRED: 2374 case PRIV_SCHED_SETPRIORITY: 2375 case PRIV_SCHED_RTPRIO: 2376 case PRIV_SCHED_SETPOLICY: 2377 case PRIV_SCHED_SET: 2378 case PRIV_SCHED_SETPARAM: 2379 2380 /* 2381 * More IPC privileges. 2382 */ 2383 case PRIV_SEM_WRITE: 2384 2385 /* 2386 * Allow signaling privileges subject to integrity policy. 2387 */ 2388 case PRIV_SIGNAL_DIFFCRED: 2389 case PRIV_SIGNAL_SUGID: 2390 2391 /* 2392 * Allow access to only limited sysctls from lower integrity levels; 2393 * piggy-back on the Jail definition. 2394 */ 2395 case PRIV_SYSCTL_WRITEJAIL: 2396 2397 /* 2398 * Allow TTY-based privileges, subject to general device access using 2399 * labels on TTY device nodes, but not console privilege. 2400 */ 2401 case PRIV_TTY_DRAINWAIT: 2402 case PRIV_TTY_DTRWAIT: 2403 case PRIV_TTY_EXCLUSIVE: 2404 case PRIV_TTY_PRISON: 2405 case PRIV_TTY_STI: 2406 case PRIV_TTY_SETA: 2407 2408 /* 2409 * Grant most VFS privileges, as almost all are in practice bounded 2410 * by more specific checks using labels. 2411 */ 2412 case PRIV_VFS_READ: 2413 case PRIV_VFS_WRITE: 2414 case PRIV_VFS_ADMIN: 2415 case PRIV_VFS_EXEC: 2416 case PRIV_VFS_LOOKUP: 2417 case PRIV_VFS_CHFLAGS_DEV: 2418 case PRIV_VFS_CHOWN: 2419 case PRIV_VFS_CHROOT: 2420 case PRIV_VFS_RETAINSUGID: 2421 case PRIV_VFS_EXCEEDQUOTA: 2422 case PRIV_VFS_FCHROOT: 2423 case PRIV_VFS_FHOPEN: 2424 case PRIV_VFS_FHSTATFS: 2425 case PRIV_VFS_GENERATION: 2426 case PRIV_VFS_GETFH: 2427 case PRIV_VFS_GETQUOTA: 2428 case PRIV_VFS_LINK: 2429 case PRIV_VFS_MOUNT: 2430 case PRIV_VFS_MOUNT_OWNER: 2431 case PRIV_VFS_MOUNT_PERM: 2432 case PRIV_VFS_MOUNT_SUIDDIR: 2433 case PRIV_VFS_MOUNT_NONUSER: 2434 case PRIV_VFS_SETGID: 2435 case PRIV_VFS_STICKYFILE: 2436 case PRIV_VFS_SYSFLAGS: 2437 case PRIV_VFS_UNMOUNT: 2438 2439 /* 2440 * Allow VM privileges; it would be nice if these were subject to 2441 * resource limits. 2442 */ 2443 case PRIV_VM_MADV_PROTECT: 2444 case PRIV_VM_MLOCK: 2445 case PRIV_VM_MUNLOCK: 2446 2447 /* 2448 * Allow some but not all network privileges. In general, dont allow 2449 * reconfiguring the network stack, just normal use. 2450 */ 2451 case PRIV_NETATALK_RESERVEDPORT: 2452 case PRIV_NETINET_RESERVEDPORT: 2453 case PRIV_NETINET_RAW: 2454 case PRIV_NETINET_REUSEPORT: 2455 case PRIV_NETIPX_RESERVEDPORT: 2456 case PRIV_NETIPX_RAW: 2457 break; 2458 2459 /* 2460 * All remaining system privileges are allow only if the process 2461 * holds privilege with respect to the Biba policy. 2462 */ 2463 default: 2464 subj = SLOT(cred->cr_label); 2465 error = biba_subject_privileged(subj); 2466 if (error) 2467 return (error); 2468 } 2469 return (0); 2470} 2471 2472static int 2473biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2474 struct label *vplabel) 2475{ 2476 struct mac_biba *subj, *obj; 2477 int error; 2478 2479 if (!biba_enabled) 2480 return (0); 2481 2482 subj = SLOT(cred->cr_label); 2483 2484 error = biba_subject_privileged(subj); 2485 if (error) 2486 return (error); 2487 2488 if (vplabel == NULL) 2489 return (0); 2490 2491 obj = SLOT(vplabel); 2492 if (!biba_high_effective(obj)) 2493 return (EACCES); 2494 2495 return (0); 2496} 2497 2498static int 2499biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2500 struct label *vplabel) 2501{ 2502 struct mac_biba *subj, *obj; 2503 int error; 2504 2505 if (!biba_enabled) 2506 return (0); 2507 2508 subj = SLOT(cred->cr_label); 2509 2510 error = biba_subject_privileged(subj); 2511 if (error) 2512 return (error); 2513 2514 if (vplabel == NULL) 2515 return (0); 2516 2517 obj = SLOT(vplabel); 2518 if (!biba_high_effective(obj)) 2519 return (EACCES); 2520 2521 return (0); 2522} 2523 2524static int 2525biba_system_check_auditon(struct ucred *cred, int cmd) 2526{ 2527 struct mac_biba *subj; 2528 int error; 2529 2530 if (!biba_enabled) 2531 return (0); 2532 2533 subj = SLOT(cred->cr_label); 2534 2535 error = biba_subject_privileged(subj); 2536 if (error) 2537 return (error); 2538 2539 return (0); 2540} 2541 2542static int 2543biba_system_check_swapon(struct ucred *cred, struct vnode *vp, 2544 struct label *vplabel) 2545{ 2546 struct mac_biba *subj, *obj; 2547 int error; 2548 2549 if (!biba_enabled) 2550 return (0); 2551 2552 subj = SLOT(cred->cr_label); 2553 obj = SLOT(vplabel); 2554 2555 error = biba_subject_privileged(subj); 2556 if (error) 2557 return (error); 2558 2559 if (!biba_high_effective(obj)) 2560 return (EACCES); 2561 2562 return (0); 2563} 2564 2565static int 2566biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2567 struct label *label) 2568{ 2569 struct mac_biba *subj; 2570 int error; 2571 2572 if (!biba_enabled) 2573 return (0); 2574 2575 subj = SLOT(cred->cr_label); 2576 2577 error = biba_subject_privileged(subj); 2578 if (error) 2579 return (error); 2580 2581 return (0); 2582} 2583 2584static int 2585biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2586 void *arg1, int arg2, struct sysctl_req *req) 2587{ 2588 struct mac_biba *subj; 2589 int error; 2590 2591 if (!biba_enabled) 2592 return (0); 2593 2594 subj = SLOT(cred->cr_label); 2595 2596 /* 2597 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2598 * but also require privilege to change them. 2599 */ 2600 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2601 if (!biba_subject_dominate_high(subj)) 2602 return (EACCES); 2603 2604 error = biba_subject_privileged(subj); 2605 if (error) 2606 return (error); 2607 } 2608 2609 return (0); 2610} 2611 2612static int 2613biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2614 struct label *dvplabel) 2615{ 2616 struct mac_biba *subj, *obj; 2617 2618 if (!biba_enabled) 2619 return (0); 2620 2621 subj = SLOT(cred->cr_label); 2622 obj = SLOT(dvplabel); 2623 2624 if (!biba_dominate_effective(obj, subj)) 2625 return (EACCES); 2626 2627 return (0); 2628} 2629 2630static int 2631biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2632 struct label *dvplabel) 2633{ 2634 struct mac_biba *subj, *obj; 2635 2636 if (!biba_enabled) 2637 return (0); 2638 2639 subj = SLOT(cred->cr_label); 2640 obj = SLOT(dvplabel); 2641 2642 if (!biba_dominate_effective(obj, subj)) 2643 return (EACCES); 2644 2645 return (0); 2646} 2647 2648static int 2649biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2650 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2651{ 2652 struct mac_biba *subj, *obj; 2653 2654 if (!biba_enabled) 2655 return (0); 2656 2657 subj = SLOT(cred->cr_label); 2658 obj = SLOT(dvplabel); 2659 2660 if (!biba_dominate_effective(subj, obj)) 2661 return (EACCES); 2662 2663 return (0); 2664} 2665 2666static int 2667biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2668 struct label *vplabel, acl_type_t type) 2669{ 2670 struct mac_biba *subj, *obj; 2671 2672 if (!biba_enabled) 2673 return (0); 2674 2675 subj = SLOT(cred->cr_label); 2676 obj = SLOT(vplabel); 2677 2678 if (!biba_dominate_effective(subj, obj)) 2679 return (EACCES); 2680 2681 return (0); 2682} 2683 2684static int 2685biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2686 struct label *vplabel, int attrnamespace, const char *name) 2687{ 2688 struct mac_biba *subj, *obj; 2689 2690 if (!biba_enabled) 2691 return (0); 2692 2693 subj = SLOT(cred->cr_label); 2694 obj = SLOT(vplabel); 2695 2696 if (!biba_dominate_effective(subj, obj)) 2697 return (EACCES); 2698 2699 return (0); 2700} 2701 2702static int 2703biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2704 struct label *vplabel, struct image_params *imgp, 2705 struct label *execlabel) 2706{ 2707 struct mac_biba *subj, *obj, *exec; 2708 int error; 2709 2710 if (execlabel != NULL) { 2711 /* 2712 * We currently don't permit labels to be changed at 2713 * exec-time as part of Biba, so disallow non-NULL Biba label 2714 * elements in the execlabel. 2715 */ 2716 exec = SLOT(execlabel); 2717 error = biba_atmostflags(exec, 0); 2718 if (error) 2719 return (error); 2720 } 2721 2722 if (!biba_enabled) 2723 return (0); 2724 2725 subj = SLOT(cred->cr_label); 2726 obj = SLOT(vplabel); 2727 2728 if (!biba_dominate_effective(obj, subj)) 2729 return (EACCES); 2730 2731 return (0); 2732} 2733 2734static int 2735biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2736 struct label *vplabel, acl_type_t type) 2737{ 2738 struct mac_biba *subj, *obj; 2739 2740 if (!biba_enabled) 2741 return (0); 2742 2743 subj = SLOT(cred->cr_label); 2744 obj = SLOT(vplabel); 2745 2746 if (!biba_dominate_effective(obj, subj)) 2747 return (EACCES); 2748 2749 return (0); 2750} 2751 2752static int 2753biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2754 struct label *vplabel, int attrnamespace, const char *name, 2755 struct uio *uio) 2756{ 2757 struct mac_biba *subj, *obj; 2758 2759 if (!biba_enabled) 2760 return (0); 2761 2762 subj = SLOT(cred->cr_label); 2763 obj = SLOT(vplabel); 2764 2765 if (!biba_dominate_effective(obj, subj)) 2766 return (EACCES); 2767 2768 return (0); 2769} 2770 2771static int 2772biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2773 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2774 struct componentname *cnp) 2775{ 2776 struct mac_biba *subj, *obj; 2777 2778 if (!biba_enabled) 2779 return (0); 2780 2781 subj = SLOT(cred->cr_label); 2782 obj = SLOT(dvplabel); 2783 2784 if (!biba_dominate_effective(subj, obj)) 2785 return (EACCES); 2786 2787 obj = SLOT(vplabel); 2788 2789 if (!biba_dominate_effective(subj, obj)) 2790 return (EACCES); 2791 2792 return (0); 2793} 2794 2795static int 2796biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2797 struct label *vplabel, int attrnamespace) 2798{ 2799 struct mac_biba *subj, *obj; 2800 2801 if (!biba_enabled) 2802 return (0); 2803 2804 subj = SLOT(cred->cr_label); 2805 obj = SLOT(vplabel); 2806 2807 if (!biba_dominate_effective(obj, subj)) 2808 return (EACCES); 2809 2810 return (0); 2811} 2812 2813static int 2814biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2815 struct label *dvplabel, struct componentname *cnp) 2816{ 2817 struct mac_biba *subj, *obj; 2818 2819 if (!biba_enabled) 2820 return (0); 2821 2822 subj = SLOT(cred->cr_label); 2823 obj = SLOT(dvplabel); 2824 2825 if (!biba_dominate_effective(obj, subj)) 2826 return (EACCES); 2827 2828 return (0); 2829} 2830 2831static int 2832biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2833 struct label *vplabel, int prot, int flags) 2834{ 2835 struct mac_biba *subj, *obj; 2836 2837 /* 2838 * Rely on the use of open()-time protections to handle 2839 * non-revocation cases. 2840 */ 2841 if (!biba_enabled || !revocation_enabled) 2842 return (0); 2843 2844 subj = SLOT(cred->cr_label); 2845 obj = SLOT(vplabel); 2846 2847 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2848 if (!biba_dominate_effective(obj, subj)) 2849 return (EACCES); 2850 } 2851 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2852 if (!biba_dominate_effective(subj, obj)) 2853 return (EACCES); 2854 } 2855 2856 return (0); 2857} 2858 2859static int 2860biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2861 struct label *vplabel, int acc_mode) 2862{ 2863 struct mac_biba *subj, *obj; 2864 2865 if (!biba_enabled) 2866 return (0); 2867 2868 subj = SLOT(cred->cr_label); 2869 obj = SLOT(vplabel); 2870 2871 /* XXX privilege override for admin? */ 2872 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2873 if (!biba_dominate_effective(obj, subj)) 2874 return (EACCES); 2875 } 2876 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2877 if (!biba_dominate_effective(subj, obj)) 2878 return (EACCES); 2879 } 2880 2881 return (0); 2882} 2883 2884static int 2885biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2886 struct vnode *vp, struct label *vplabel) 2887{ 2888 struct mac_biba *subj, *obj; 2889 2890 if (!biba_enabled || !revocation_enabled) 2891 return (0); 2892 2893 subj = SLOT(active_cred->cr_label); 2894 obj = SLOT(vplabel); 2895 2896 if (!biba_dominate_effective(obj, subj)) 2897 return (EACCES); 2898 2899 return (0); 2900} 2901 2902static int 2903biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2904 struct vnode *vp, struct label *vplabel) 2905{ 2906 struct mac_biba *subj, *obj; 2907 2908 if (!biba_enabled || !revocation_enabled) 2909 return (0); 2910 2911 subj = SLOT(active_cred->cr_label); 2912 obj = SLOT(vplabel); 2913 2914 if (!biba_dominate_effective(obj, subj)) 2915 return (EACCES); 2916 2917 return (0); 2918} 2919 2920static int 2921biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2922 struct label *dvplabel) 2923{ 2924 struct mac_biba *subj, *obj; 2925 2926 if (!biba_enabled) 2927 return (0); 2928 2929 subj = SLOT(cred->cr_label); 2930 obj = SLOT(dvplabel); 2931 2932 if (!biba_dominate_effective(obj, subj)) 2933 return (EACCES); 2934 2935 return (0); 2936} 2937 2938static int 2939biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2940 struct label *vplabel) 2941{ 2942 struct mac_biba *subj, *obj; 2943 2944 if (!biba_enabled) 2945 return (0); 2946 2947 subj = SLOT(cred->cr_label); 2948 obj = SLOT(vplabel); 2949 2950 if (!biba_dominate_effective(obj, subj)) 2951 return (EACCES); 2952 2953 return (0); 2954} 2955 2956static int 2957biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2958 struct label *vplabel, struct label *newlabel) 2959{ 2960 struct mac_biba *old, *new, *subj; 2961 int error; 2962 2963 old = SLOT(vplabel); 2964 new = SLOT(newlabel); 2965 subj = SLOT(cred->cr_label); 2966 2967 /* 2968 * If there is a Biba label update for the vnode, it must be a 2969 * effective label. 2970 */ 2971 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2972 if (error) 2973 return (error); 2974 2975 /* 2976 * To perform a relabel of the vnode (Biba label or not), Biba must 2977 * authorize the relabel. 2978 */ 2979 if (!biba_effective_in_range(old, subj)) 2980 return (EPERM); 2981 2982 /* 2983 * If the Biba label is to be changed, authorize as appropriate. 2984 */ 2985 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2986 /* 2987 * To change the Biba label on a vnode, the new vnode label 2988 * must be in the subject range. 2989 */ 2990 if (!biba_effective_in_range(new, subj)) 2991 return (EPERM); 2992 2993 /* 2994 * To change the Biba label on the vnode to be EQUAL, the 2995 * subject must have appropriate privilege. 2996 */ 2997 if (biba_contains_equal(new)) { 2998 error = biba_subject_privileged(subj); 2999 if (error) 3000 return (error); 3001 } 3002 } 3003 3004 return (0); 3005} 3006 3007static int 3008biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 3009 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3010 struct componentname *cnp) 3011{ 3012 struct mac_biba *subj, *obj; 3013 3014 if (!biba_enabled) 3015 return (0); 3016 3017 subj = SLOT(cred->cr_label); 3018 obj = SLOT(dvplabel); 3019 3020 if (!biba_dominate_effective(subj, obj)) 3021 return (EACCES); 3022 3023 obj = SLOT(vplabel); 3024 3025 if (!biba_dominate_effective(subj, obj)) 3026 return (EACCES); 3027 3028 return (0); 3029} 3030 3031static int 3032biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 3033 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3034 int samedir, struct componentname *cnp) 3035{ 3036 struct mac_biba *subj, *obj; 3037 3038 if (!biba_enabled) 3039 return (0); 3040 3041 subj = SLOT(cred->cr_label); 3042 obj = SLOT(dvplabel); 3043 3044 if (!biba_dominate_effective(subj, obj)) 3045 return (EACCES); 3046 3047 if (vp != NULL) { 3048 obj = SLOT(vplabel); 3049 3050 if (!biba_dominate_effective(subj, obj)) 3051 return (EACCES); 3052 } 3053 3054 return (0); 3055} 3056 3057static int 3058biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3059 struct label *vplabel) 3060{ 3061 struct mac_biba *subj, *obj; 3062 3063 if (!biba_enabled) 3064 return (0); 3065 3066 subj = SLOT(cred->cr_label); 3067 obj = SLOT(vplabel); 3068 3069 if (!biba_dominate_effective(subj, obj)) 3070 return (EACCES); 3071 3072 return (0); 3073} 3074 3075static int 3076biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 3077 struct label *vplabel, acl_type_t type, struct acl *acl) 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 3093static int 3094biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3095 struct label *vplabel, int attrnamespace, const char *name, 3096 struct uio *uio) 3097{ 3098 struct mac_biba *subj, *obj; 3099 3100 if (!biba_enabled) 3101 return (0); 3102 3103 subj = SLOT(cred->cr_label); 3104 obj = SLOT(vplabel); 3105 3106 if (!biba_dominate_effective(subj, obj)) 3107 return (EACCES); 3108 3109 /* XXX: protect the MAC EA in a special way? */ 3110 3111 return (0); 3112} 3113 3114static int 3115biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3116 struct label *vplabel, u_long flags) 3117{ 3118 struct mac_biba *subj, *obj; 3119 3120 if (!biba_enabled) 3121 return (0); 3122 3123 subj = SLOT(cred->cr_label); 3124 obj = SLOT(vplabel); 3125 3126 if (!biba_dominate_effective(subj, obj)) 3127 return (EACCES); 3128 3129 return (0); 3130} 3131 3132static int 3133biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3134 struct label *vplabel, mode_t mode) 3135{ 3136 struct mac_biba *subj, *obj; 3137 3138 if (!biba_enabled) 3139 return (0); 3140 3141 subj = SLOT(cred->cr_label); 3142 obj = SLOT(vplabel); 3143 3144 if (!biba_dominate_effective(subj, obj)) 3145 return (EACCES); 3146 3147 return (0); 3148} 3149 3150static int 3151biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3152 struct label *vplabel, uid_t uid, gid_t gid) 3153{ 3154 struct mac_biba *subj, *obj; 3155 3156 if (!biba_enabled) 3157 return (0); 3158 3159 subj = SLOT(cred->cr_label); 3160 obj = SLOT(vplabel); 3161 3162 if (!biba_dominate_effective(subj, obj)) 3163 return (EACCES); 3164 3165 return (0); 3166} 3167 3168static int 3169biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3170 struct label *vplabel, struct timespec atime, struct timespec mtime) 3171{ 3172 struct mac_biba *subj, *obj; 3173 3174 if (!biba_enabled) 3175 return (0); 3176 3177 subj = SLOT(cred->cr_label); 3178 obj = SLOT(vplabel); 3179 3180 if (!biba_dominate_effective(subj, obj)) 3181 return (EACCES); 3182 3183 return (0); 3184} 3185 3186static int 3187biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3188 struct vnode *vp, struct label *vplabel) 3189{ 3190 struct mac_biba *subj, *obj; 3191 3192 if (!biba_enabled) 3193 return (0); 3194 3195 subj = SLOT(active_cred->cr_label); 3196 obj = SLOT(vplabel); 3197 3198 if (!biba_dominate_effective(obj, subj)) 3199 return (EACCES); 3200 3201 return (0); 3202} 3203 3204static int 3205biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3206 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3207 struct componentname *cnp) 3208{ 3209 struct mac_biba *subj, *obj; 3210 3211 if (!biba_enabled) 3212 return (0); 3213 3214 subj = SLOT(cred->cr_label); 3215 obj = SLOT(dvplabel); 3216 3217 if (!biba_dominate_effective(subj, obj)) 3218 return (EACCES); 3219 3220 obj = SLOT(vplabel); 3221 3222 if (!biba_dominate_effective(subj, obj)) 3223 return (EACCES); 3224 3225 return (0); 3226} 3227 3228static int 3229biba_vnode_check_write(struct ucred *active_cred, 3230 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3231{ 3232 struct mac_biba *subj, *obj; 3233 3234 if (!biba_enabled || !revocation_enabled) 3235 return (0); 3236 3237 subj = SLOT(active_cred->cr_label); 3238 obj = SLOT(vplabel); 3239 3240 if (!biba_dominate_effective(subj, obj)) 3241 return (EACCES); 3242 3243 return (0); 3244} 3245 3246static void 3247biba_syncache_create(struct label *label, struct inpcb *inp) 3248{ 3249 struct mac_biba *source, *dest; 3250 3251 source = SLOT(inp->inp_label); 3252 dest = SLOT(label); 3253 biba_copy_effective(source, dest); 3254} 3255 3256static void 3257biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 3258 struct label *mlabel) 3259{ 3260 struct mac_biba *source, *dest; 3261 3262 source = SLOT(sc_label); 3263 dest = SLOT(mlabel); 3264 biba_copy_effective(source, dest); 3265} 3266 3267static struct mac_policy_ops mac_biba_ops = 3268{ 3269 .mpo_init = biba_init, 3270 .mpo_bpfdesc_init_label = biba_init_label, 3271 .mpo_cred_init_label = biba_init_label, 3272 .mpo_devfs_init_label = biba_init_label, 3273 .mpo_ifnet_init_label = biba_init_label, 3274 .mpo_inpcb_init_label = biba_init_label_waitcheck, 3275 .mpo_syncache_init_label = biba_init_label_waitcheck, 3276 .mpo_sysvmsg_init_label = biba_init_label, 3277 .mpo_sysvmsq_init_label = biba_init_label, 3278 .mpo_sysvsem_init_label = biba_init_label, 3279 .mpo_sysvshm_init_label = biba_init_label, 3280 .mpo_ipq_init_label = biba_init_label_waitcheck, 3281 .mpo_mbuf_init_label = biba_init_label_waitcheck, 3282 .mpo_mount_init_label = biba_init_label, 3283 .mpo_pipe_init_label = biba_init_label, 3284 .mpo_posixsem_init_label = biba_init_label, 3285 .mpo_socket_init_label = biba_init_label_waitcheck, 3286 .mpo_socketpeer_init_label = biba_init_label_waitcheck, 3287 .mpo_syncache_create = biba_syncache_create, 3288 .mpo_vnode_init_label = biba_init_label, 3289 .mpo_bpfdesc_destroy_label = biba_destroy_label, 3290 .mpo_cred_destroy_label = biba_destroy_label, 3291 .mpo_devfs_destroy_label = biba_destroy_label, 3292 .mpo_ifnet_destroy_label = biba_destroy_label, 3293 .mpo_inpcb_destroy_label = biba_destroy_label, 3294 .mpo_syncache_destroy_label = biba_destroy_label, 3295 .mpo_sysvmsg_destroy_label = biba_destroy_label, 3296 .mpo_sysvmsq_destroy_label = biba_destroy_label, 3297 .mpo_sysvsem_destroy_label = biba_destroy_label, 3298 .mpo_sysvshm_destroy_label = biba_destroy_label, 3299 .mpo_ipq_destroy_label = biba_destroy_label, 3300 .mpo_mbuf_destroy_label = biba_destroy_label, 3301 .mpo_mount_destroy_label = biba_destroy_label, 3302 .mpo_pipe_destroy_label = biba_destroy_label, 3303 .mpo_posixsem_destroy_label = biba_destroy_label, 3304 .mpo_socket_destroy_label = biba_destroy_label, 3305 .mpo_socketpeer_destroy_label = biba_destroy_label, 3306 .mpo_vnode_destroy_label = biba_destroy_label, 3307 .mpo_cred_copy_label = biba_copy_label, 3308 .mpo_ifnet_copy_label = biba_copy_label, 3309 .mpo_mbuf_copy_label = biba_copy_label, 3310 .mpo_pipe_copy_label = biba_copy_label, 3311 .mpo_socket_copy_label = biba_copy_label, 3312 .mpo_vnode_copy_label = biba_copy_label, 3313 .mpo_cred_externalize_label = biba_externalize_label, 3314 .mpo_ifnet_externalize_label = biba_externalize_label, 3315 .mpo_pipe_externalize_label = biba_externalize_label, 3316 .mpo_socket_externalize_label = biba_externalize_label, 3317 .mpo_socketpeer_externalize_label = biba_externalize_label, 3318 .mpo_vnode_externalize_label = biba_externalize_label, 3319 .mpo_cred_internalize_label = biba_internalize_label, 3320 .mpo_ifnet_internalize_label = biba_internalize_label, 3321 .mpo_pipe_internalize_label = biba_internalize_label, 3322 .mpo_socket_internalize_label = biba_internalize_label, 3323 .mpo_vnode_internalize_label = biba_internalize_label, 3324 .mpo_devfs_create_device = biba_devfs_create_device, 3325 .mpo_devfs_create_directory = biba_devfs_create_directory, 3326 .mpo_devfs_create_symlink = biba_devfs_create_symlink, 3327 .mpo_mount_create = biba_mount_create, 3328 .mpo_vnode_relabel = biba_vnode_relabel, 3329 .mpo_devfs_update = biba_devfs_update, 3330 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, 3331 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, 3332 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, 3333 .mpo_vnode_create_extattr = biba_vnode_create_extattr, 3334 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, 3335 .mpo_socket_create_mbuf = biba_socket_create_mbuf, 3336 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf, 3337 .mpo_pipe_create = biba_pipe_create, 3338 .mpo_posixsem_create = biba_posixsem_create, 3339 .mpo_socket_create = biba_socket_create, 3340 .mpo_socket_newconn = biba_socket_newconn, 3341 .mpo_pipe_relabel = biba_pipe_relabel, 3342 .mpo_socket_relabel = biba_socket_relabel, 3343 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, 3344 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, 3345 .mpo_bpfdesc_create = biba_bpfdesc_create, 3346 .mpo_ipq_reassemble = biba_ipq_reassemble, 3347 .mpo_netinet_fragment = biba_netinet_fragment, 3348 .mpo_ifnet_create = biba_ifnet_create, 3349 .mpo_inpcb_create = biba_inpcb_create, 3350 .mpo_sysvmsg_create = biba_sysvmsg_create, 3351 .mpo_sysvmsq_create = biba_sysvmsq_create, 3352 .mpo_sysvsem_create = biba_sysvsem_create, 3353 .mpo_sysvshm_create = biba_sysvshm_create, 3354 .mpo_ipq_create = biba_ipq_create, 3355 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, 3356 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, 3357 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, 3358 .mpo_mbuf_create_multicast_encap = biba_mbuf_create_multicast_encap, 3359 .mpo_mbuf_create_netlayer = biba_mbuf_create_netlayer, 3360 .mpo_ipq_match = biba_ipq_match, 3361 .mpo_ifnet_relabel = biba_ifnet_relabel, 3362 .mpo_ipq_update = biba_ipq_update, 3363 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, 3364 .mpo_proc_create_swapper = biba_proc_create_swapper, 3365 .mpo_proc_create_init = biba_proc_create_init, 3366 .mpo_proc_associate_nfsd = biba_proc_associate_nfsd, 3367 .mpo_cred_relabel = biba_cred_relabel, 3368 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3369 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3370 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3371 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3372 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3373 .mpo_cred_check_relabel = biba_cred_check_relabel, 3374 .mpo_cred_check_visible = biba_cred_check_visible, 3375 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3376 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3377 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3378 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3379 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3380 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3381 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3382 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3383 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3384 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3385 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3386 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3387 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3388 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3389 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3390 .mpo_kld_check_load = biba_kld_check_load, 3391 .mpo_mount_check_stat = biba_mount_check_stat, 3392 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3393 .mpo_pipe_check_poll = biba_pipe_check_poll, 3394 .mpo_pipe_check_read = biba_pipe_check_read, 3395 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3396 .mpo_pipe_check_stat = biba_pipe_check_stat, 3397 .mpo_pipe_check_write = biba_pipe_check_write, 3398 .mpo_posixsem_check_destroy = biba_posixsem_check_write, 3399 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3400 .mpo_posixsem_check_open = biba_posixsem_check_write, 3401 .mpo_posixsem_check_post = biba_posixsem_check_write, 3402 .mpo_posixsem_check_unlink = biba_posixsem_check_write, 3403 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3404 .mpo_proc_check_debug = biba_proc_check_debug, 3405 .mpo_proc_check_sched = biba_proc_check_sched, 3406 .mpo_proc_check_signal = biba_proc_check_signal, 3407 .mpo_socket_check_deliver = biba_socket_check_deliver, 3408 .mpo_socket_check_relabel = biba_socket_check_relabel, 3409 .mpo_socket_check_visible = biba_socket_check_visible, 3410 .mpo_system_check_acct = biba_system_check_acct, 3411 .mpo_system_check_auditctl = biba_system_check_auditctl, 3412 .mpo_system_check_auditon = biba_system_check_auditon, 3413 .mpo_system_check_swapon = biba_system_check_swapon, 3414 .mpo_system_check_swapoff = biba_system_check_swapoff, 3415 .mpo_system_check_sysctl = biba_system_check_sysctl, 3416 .mpo_vnode_check_access = biba_vnode_check_open, 3417 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3418 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3419 .mpo_vnode_check_create = biba_vnode_check_create, 3420 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3421 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3422 .mpo_vnode_check_exec = biba_vnode_check_exec, 3423 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3424 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3425 .mpo_vnode_check_link = biba_vnode_check_link, 3426 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3427 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3428 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3429 .mpo_vnode_check_open = biba_vnode_check_open, 3430 .mpo_vnode_check_poll = biba_vnode_check_poll, 3431 .mpo_vnode_check_read = biba_vnode_check_read, 3432 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3433 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3434 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3435 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3436 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3437 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3438 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3439 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3440 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3441 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3442 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3443 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3444 .mpo_vnode_check_stat = biba_vnode_check_stat, 3445 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3446 .mpo_vnode_check_write = biba_vnode_check_write, 3447 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send, 3448 .mpo_netinet_arp_send = biba_netinet_arp_send, 3449 .mpo_netinet_firewall_send = biba_netinet_firewall_send, 3450 .mpo_netinet_igmp_send = biba_netinet_igmp_send, 3451 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send, 3452 .mpo_priv_check = biba_priv_check, 3453}; 3454 3455MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3456 MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &biba_slot); 3457