mac_biba.c revision 172955
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 172955 2007-10-25 11:31:11Z 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_create_mbuf_linklayer(struct ifnet *ifp, struct label *ifplabel, 1272 struct mbuf *m, struct label *mlabel) 1273{ 1274 struct mac_biba *dest; 1275 1276 dest = SLOT(mlabel); 1277 1278 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1279} 1280 1281static void 1282biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, 1283 struct mbuf *m, struct label *mlabel) 1284{ 1285 struct mac_biba *source, *dest; 1286 1287 source = SLOT(dlabel); 1288 dest = SLOT(mlabel); 1289 1290 biba_copy_effective(source, dest); 1291} 1292 1293static void 1294biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1295 struct mbuf *m, struct label *mlabel) 1296{ 1297 struct mac_biba *source, *dest; 1298 1299 source = SLOT(ifplabel); 1300 dest = SLOT(mlabel); 1301 1302 biba_copy_effective(source, dest); 1303} 1304 1305static void 1306biba_mbuf_create_multicast_encap(struct mbuf *m, struct label *mlabel, 1307 struct ifnet *ifp, struct label *ifplabel, struct mbuf *mnew, 1308 struct label *mnewlabel) 1309{ 1310 struct mac_biba *source, *dest; 1311 1312 source = SLOT(mlabel); 1313 dest = SLOT(mnewlabel); 1314 1315 biba_copy_effective(source, dest); 1316} 1317 1318static void 1319biba_mbuf_create_netlayer(struct mbuf *m, struct label *mlabel, 1320 struct mbuf *newm, struct label *mnewlabel) 1321{ 1322 struct mac_biba *source, *dest; 1323 1324 source = SLOT(mlabel); 1325 dest = SLOT(mnewlabel); 1326 1327 biba_copy_effective(source, dest); 1328} 1329 1330static int 1331biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1332 struct label *ipqlabel) 1333{ 1334 struct mac_biba *a, *b; 1335 1336 a = SLOT(ipqlabel); 1337 b = SLOT(mlabel); 1338 1339 return (biba_equal_effective(a, b)); 1340} 1341 1342static void 1343biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1344 struct label *ifplabel, struct label *newlabel) 1345{ 1346 struct mac_biba *source, *dest; 1347 1348 source = SLOT(newlabel); 1349 dest = SLOT(ifplabel); 1350 1351 biba_copy(source, dest); 1352} 1353 1354static void 1355biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1356 struct label *ipqlabel) 1357{ 1358 1359 /* NOOP: we only accept matching labels, so no need to update */ 1360} 1361 1362static void 1363biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1364 struct inpcb *inp, struct label *inplabel) 1365{ 1366 struct mac_biba *source, *dest; 1367 1368 source = SLOT(solabel); 1369 dest = SLOT(inplabel); 1370 1371 biba_copy(source, dest); 1372} 1373 1374static void 1375biba_mbuf_create_from_firewall(struct mbuf *m, struct label *label) 1376{ 1377 struct mac_biba *dest; 1378 1379 dest = SLOT(label); 1380 1381 /* XXX: where is the label for the firewall really comming from? */ 1382 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1383} 1384 1385/* 1386 * Labeling event operations: processes. 1387 */ 1388static void 1389biba_proc_create_swapper(struct ucred *cred) 1390{ 1391 struct mac_biba *dest; 1392 1393 dest = SLOT(cred->cr_label); 1394 1395 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1396 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1397 0, NULL); 1398} 1399 1400static void 1401biba_proc_create_init(struct ucred *cred) 1402{ 1403 struct mac_biba *dest; 1404 1405 dest = SLOT(cred->cr_label); 1406 1407 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1408 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1409 0, NULL); 1410} 1411 1412static void 1413biba_cred_relabel(struct ucred *cred, struct label *newlabel) 1414{ 1415 struct mac_biba *source, *dest; 1416 1417 source = SLOT(newlabel); 1418 dest = SLOT(cred->cr_label); 1419 1420 biba_copy(source, dest); 1421} 1422 1423/* 1424 * Label cleanup/flush operations 1425 */ 1426static void 1427biba_sysvmsg_cleanup(struct label *msglabel) 1428{ 1429 1430 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 1431} 1432 1433static void 1434biba_sysvmsq_cleanup(struct label *msqlabel) 1435{ 1436 1437 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 1438} 1439 1440static void 1441biba_sysvsem_cleanup(struct label *semalabel) 1442{ 1443 1444 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 1445} 1446 1447static void 1448biba_sysvshm_cleanup(struct label *shmlabel) 1449{ 1450 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 1451} 1452 1453/* 1454 * Access control checks. 1455 */ 1456static int 1457biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 1458 struct ifnet *ifp, struct label *ifplabel) 1459{ 1460 struct mac_biba *a, *b; 1461 1462 if (!biba_enabled) 1463 return (0); 1464 1465 a = SLOT(dlabel); 1466 b = SLOT(ifplabel); 1467 1468 if (biba_equal_effective(a, b)) 1469 return (0); 1470 return (EACCES); 1471} 1472 1473static int 1474biba_cred_check_relabel(struct ucred *cred, struct label *newlabel) 1475{ 1476 struct mac_biba *subj, *new; 1477 int error; 1478 1479 subj = SLOT(cred->cr_label); 1480 new = SLOT(newlabel); 1481 1482 /* 1483 * If there is a Biba label update for the credential, it may 1484 * be an update of the effective, range, or both. 1485 */ 1486 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1487 if (error) 1488 return (error); 1489 1490 /* 1491 * If the Biba label is to be changed, authorize as appropriate. 1492 */ 1493 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1494 /* 1495 * If the change request modifies both the Biba label 1496 * effective and range, check that the new effective will be 1497 * in the new range. 1498 */ 1499 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 1500 MAC_BIBA_FLAGS_BOTH && 1501 !biba_effective_in_range(new, new)) 1502 return (EINVAL); 1503 1504 /* 1505 * To change the Biba effective label on a credential, the 1506 * new effective label must be in the current range. 1507 */ 1508 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && 1509 !biba_effective_in_range(new, subj)) 1510 return (EPERM); 1511 1512 /* 1513 * To change the Biba range on a credential, the new range 1514 * label must be in the current range. 1515 */ 1516 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1517 !biba_range_in_range(new, subj)) 1518 return (EPERM); 1519 1520 /* 1521 * To have EQUAL in any component of the new credential Biba 1522 * label, the subject must already have EQUAL in their label. 1523 */ 1524 if (biba_contains_equal(new)) { 1525 error = biba_subject_privileged(subj); 1526 if (error) 1527 return (error); 1528 } 1529 } 1530 1531 return (0); 1532} 1533 1534static int 1535biba_cred_check_visible(struct ucred *u1, struct ucred *u2) 1536{ 1537 struct mac_biba *subj, *obj; 1538 1539 if (!biba_enabled) 1540 return (0); 1541 1542 subj = SLOT(u1->cr_label); 1543 obj = SLOT(u2->cr_label); 1544 1545 /* XXX: range */ 1546 if (!biba_dominate_effective(obj, subj)) 1547 return (ESRCH); 1548 1549 return (0); 1550} 1551 1552static int 1553biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1554 struct label *ifplabel, struct label *newlabel) 1555{ 1556 struct mac_biba *subj, *new; 1557 int error; 1558 1559 subj = SLOT(cred->cr_label); 1560 new = SLOT(newlabel); 1561 1562 /* 1563 * If there is a Biba label update for the interface, it may be an 1564 * update of the effective, range, or both. 1565 */ 1566 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1567 if (error) 1568 return (error); 1569 1570 /* 1571 * Relabling network interfaces requires Biba privilege. 1572 */ 1573 error = biba_subject_privileged(subj); 1574 if (error) 1575 return (error); 1576 1577 return (0); 1578} 1579 1580static int 1581biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1582 struct mbuf *m, struct label *mlabel) 1583{ 1584 struct mac_biba *p, *i; 1585 1586 if (!biba_enabled) 1587 return (0); 1588 1589 p = SLOT(mlabel); 1590 i = SLOT(ifplabel); 1591 1592 return (biba_effective_in_range(p, i) ? 0 : EACCES); 1593} 1594 1595static int 1596biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1597 struct mbuf *m, struct label *mlabel) 1598{ 1599 struct mac_biba *p, *i; 1600 1601 if (!biba_enabled) 1602 return (0); 1603 1604 p = SLOT(mlabel); 1605 i = SLOT(inplabel); 1606 1607 return (biba_equal_effective(p, i) ? 0 : EACCES); 1608} 1609 1610static int 1611biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 1612 struct label *msglabel) 1613{ 1614 struct mac_biba *subj, *obj; 1615 1616 if (!biba_enabled) 1617 return (0); 1618 1619 subj = SLOT(cred->cr_label); 1620 obj = SLOT(msglabel); 1621 1622 if (!biba_dominate_effective(obj, subj)) 1623 return (EACCES); 1624 1625 return (0); 1626} 1627 1628static int 1629biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 1630 struct label *msglabel) 1631{ 1632 struct mac_biba *subj, *obj; 1633 1634 if (!biba_enabled) 1635 return (0); 1636 1637 subj = SLOT(cred->cr_label); 1638 obj = SLOT(msglabel); 1639 1640 if (!biba_dominate_effective(subj, obj)) 1641 return (EACCES); 1642 1643 return (0); 1644} 1645 1646static int 1647biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 1648 struct label *msqklabel) 1649{ 1650 struct mac_biba *subj, *obj; 1651 1652 if (!biba_enabled) 1653 return (0); 1654 1655 subj = SLOT(cred->cr_label); 1656 obj = SLOT(msqklabel); 1657 1658 if (!biba_dominate_effective(obj, subj)) 1659 return (EACCES); 1660 1661 return (0); 1662} 1663 1664static int 1665biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 1666 struct label *msqklabel) 1667{ 1668 struct mac_biba *subj, *obj; 1669 1670 if (!biba_enabled) 1671 return (0); 1672 1673 subj = SLOT(cred->cr_label); 1674 obj = SLOT(msqklabel); 1675 1676 if (!biba_dominate_effective(subj, obj)) 1677 return (EACCES); 1678 1679 return (0); 1680} 1681 1682static int 1683biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 1684 struct label *msqklabel) 1685{ 1686 struct mac_biba *subj, *obj; 1687 1688 if (!biba_enabled) 1689 return (0); 1690 1691 subj = SLOT(cred->cr_label); 1692 obj = SLOT(msqklabel); 1693 1694 if (!biba_dominate_effective(obj, subj)) 1695 return (EACCES); 1696 1697 return (0); 1698} 1699 1700static int 1701biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 1702 struct label *msqklabel, int cmd) 1703{ 1704 struct mac_biba *subj, *obj; 1705 1706 if (!biba_enabled) 1707 return (0); 1708 1709 subj = SLOT(cred->cr_label); 1710 obj = SLOT(msqklabel); 1711 1712 switch(cmd) { 1713 case IPC_RMID: 1714 case IPC_SET: 1715 if (!biba_dominate_effective(subj, obj)) 1716 return (EACCES); 1717 break; 1718 1719 case IPC_STAT: 1720 if (!biba_dominate_effective(obj, subj)) 1721 return (EACCES); 1722 break; 1723 1724 default: 1725 return (EACCES); 1726 } 1727 1728 return (0); 1729} 1730 1731static int 1732biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 1733 struct label *semaklabel, int cmd) 1734{ 1735 struct mac_biba *subj, *obj; 1736 1737 if (!biba_enabled) 1738 return (0); 1739 1740 subj = SLOT(cred->cr_label); 1741 obj = SLOT(semaklabel); 1742 1743 switch(cmd) { 1744 case IPC_RMID: 1745 case IPC_SET: 1746 case SETVAL: 1747 case SETALL: 1748 if (!biba_dominate_effective(subj, obj)) 1749 return (EACCES); 1750 break; 1751 1752 case IPC_STAT: 1753 case GETVAL: 1754 case GETPID: 1755 case GETNCNT: 1756 case GETZCNT: 1757 case GETALL: 1758 if (!biba_dominate_effective(obj, subj)) 1759 return (EACCES); 1760 break; 1761 1762 default: 1763 return (EACCES); 1764 } 1765 1766 return (0); 1767} 1768 1769static int 1770biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 1771 struct label *semaklabel) 1772{ 1773 struct mac_biba *subj, *obj; 1774 1775 if (!biba_enabled) 1776 return (0); 1777 1778 subj = SLOT(cred->cr_label); 1779 obj = SLOT(semaklabel); 1780 1781 if (!biba_dominate_effective(obj, subj)) 1782 return (EACCES); 1783 1784 return (0); 1785} 1786 1787static int 1788biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 1789 struct label *semaklabel, size_t accesstype) 1790{ 1791 struct mac_biba *subj, *obj; 1792 1793 if (!biba_enabled) 1794 return (0); 1795 1796 subj = SLOT(cred->cr_label); 1797 obj = SLOT(semaklabel); 1798 1799 if (accesstype & SEM_R) 1800 if (!biba_dominate_effective(obj, subj)) 1801 return (EACCES); 1802 1803 if (accesstype & SEM_A) 1804 if (!biba_dominate_effective(subj, obj)) 1805 return (EACCES); 1806 1807 return (0); 1808} 1809 1810static int 1811biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 1812 struct label *shmseglabel, int shmflg) 1813{ 1814 struct mac_biba *subj, *obj; 1815 1816 if (!biba_enabled) 1817 return (0); 1818 1819 subj = SLOT(cred->cr_label); 1820 obj = SLOT(shmseglabel); 1821 1822 if (!biba_dominate_effective(obj, subj)) 1823 return (EACCES); 1824 if ((shmflg & SHM_RDONLY) == 0) { 1825 if (!biba_dominate_effective(subj, obj)) 1826 return (EACCES); 1827 } 1828 1829 return (0); 1830} 1831 1832static int 1833biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 1834 struct label *shmseglabel, int cmd) 1835{ 1836 struct mac_biba *subj, *obj; 1837 1838 if (!biba_enabled) 1839 return (0); 1840 1841 subj = SLOT(cred->cr_label); 1842 obj = SLOT(shmseglabel); 1843 1844 switch(cmd) { 1845 case IPC_RMID: 1846 case IPC_SET: 1847 if (!biba_dominate_effective(subj, obj)) 1848 return (EACCES); 1849 break; 1850 1851 case IPC_STAT: 1852 case SHM_STAT: 1853 if (!biba_dominate_effective(obj, subj)) 1854 return (EACCES); 1855 break; 1856 1857 default: 1858 return (EACCES); 1859 } 1860 1861 return (0); 1862} 1863 1864static int 1865biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 1866 struct label *shmseglabel, int shmflg) 1867{ 1868 struct mac_biba *subj, *obj; 1869 1870 if (!biba_enabled) 1871 return (0); 1872 1873 subj = SLOT(cred->cr_label); 1874 obj = SLOT(shmseglabel); 1875 1876 if (!biba_dominate_effective(obj, subj)) 1877 return (EACCES); 1878 1879 return (0); 1880} 1881 1882static int 1883biba_kld_check_load(struct ucred *cred, struct vnode *vp, 1884 struct label *vplabel) 1885{ 1886 struct mac_biba *subj, *obj; 1887 int error; 1888 1889 if (!biba_enabled) 1890 return (0); 1891 1892 subj = SLOT(cred->cr_label); 1893 1894 error = biba_subject_privileged(subj); 1895 if (error) 1896 return (error); 1897 1898 obj = SLOT(vplabel); 1899 if (!biba_high_effective(obj)) 1900 return (EACCES); 1901 1902 return (0); 1903} 1904 1905static int 1906biba_mount_check_stat(struct ucred *cred, struct mount *mp, 1907 struct label *mplabel) 1908{ 1909 struct mac_biba *subj, *obj; 1910 1911 if (!biba_enabled) 1912 return (0); 1913 1914 subj = SLOT(cred->cr_label); 1915 obj = SLOT(mplabel); 1916 1917 if (!biba_dominate_effective(obj, subj)) 1918 return (EACCES); 1919 1920 return (0); 1921} 1922 1923static int 1924biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1925 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1926{ 1927 1928 if(!biba_enabled) 1929 return (0); 1930 1931 /* XXX: This will be implemented soon... */ 1932 1933 return (0); 1934} 1935 1936static int 1937biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1938 struct label *pplabel) 1939{ 1940 struct mac_biba *subj, *obj; 1941 1942 if (!biba_enabled) 1943 return (0); 1944 1945 subj = SLOT(cred->cr_label); 1946 obj = SLOT(pplabel); 1947 1948 if (!biba_dominate_effective(obj, subj)) 1949 return (EACCES); 1950 1951 return (0); 1952} 1953 1954static int 1955biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1956 struct label *pplabel) 1957{ 1958 struct mac_biba *subj, *obj; 1959 1960 if (!biba_enabled) 1961 return (0); 1962 1963 subj = SLOT(cred->cr_label); 1964 obj = SLOT(pplabel); 1965 1966 if (!biba_dominate_effective(obj, subj)) 1967 return (EACCES); 1968 1969 return (0); 1970} 1971 1972static int 1973biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1974 struct label *pplabel, struct label *newlabel) 1975{ 1976 struct mac_biba *subj, *obj, *new; 1977 int error; 1978 1979 new = SLOT(newlabel); 1980 subj = SLOT(cred->cr_label); 1981 obj = SLOT(pplabel); 1982 1983 /* 1984 * If there is a Biba label update for a pipe, it must be a effective 1985 * update. 1986 */ 1987 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1988 if (error) 1989 return (error); 1990 1991 /* 1992 * To perform a relabel of a pipe (Biba label or not), Biba must 1993 * authorize the relabel. 1994 */ 1995 if (!biba_effective_in_range(obj, subj)) 1996 return (EPERM); 1997 1998 /* 1999 * If the Biba label is to be changed, authorize as appropriate. 2000 */ 2001 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2002 /* 2003 * To change the Biba label on a pipe, the new pipe label 2004 * must be in the subject range. 2005 */ 2006 if (!biba_effective_in_range(new, subj)) 2007 return (EPERM); 2008 2009 /* 2010 * To change the Biba label on a pipe to be EQUAL, the 2011 * subject must have appropriate privilege. 2012 */ 2013 if (biba_contains_equal(new)) { 2014 error = biba_subject_privileged(subj); 2015 if (error) 2016 return (error); 2017 } 2018 } 2019 2020 return (0); 2021} 2022 2023static int 2024biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 2025 struct label *pplabel) 2026{ 2027 struct mac_biba *subj, *obj; 2028 2029 if (!biba_enabled) 2030 return (0); 2031 2032 subj = SLOT(cred->cr_label); 2033 obj = SLOT(pplabel); 2034 2035 if (!biba_dominate_effective(obj, subj)) 2036 return (EACCES); 2037 2038 return (0); 2039} 2040 2041static int 2042biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, 2043 struct label *pplabel) 2044{ 2045 struct mac_biba *subj, *obj; 2046 2047 if (!biba_enabled) 2048 return (0); 2049 2050 subj = SLOT(cred->cr_label); 2051 obj = SLOT(pplabel); 2052 2053 if (!biba_dominate_effective(subj, obj)) 2054 return (EACCES); 2055 2056 return (0); 2057} 2058 2059static int 2060biba_posixsem_check_write(struct ucred *cred, struct ksem *ks, 2061 struct label *kslabel) 2062{ 2063 struct mac_biba *subj, *obj; 2064 2065 if (!biba_enabled) 2066 return (0); 2067 2068 subj = SLOT(cred->cr_label); 2069 obj = SLOT(kslabel); 2070 2071 if (!biba_dominate_effective(subj, obj)) 2072 return (EACCES); 2073 2074 return (0); 2075} 2076 2077static int 2078biba_posixsem_check_rdonly(struct ucred *cred, struct ksem *ks, 2079 struct label *kslabel) 2080{ 2081 struct mac_biba *subj, *obj; 2082 2083 if (!biba_enabled) 2084 return (0); 2085 2086 subj = SLOT(cred->cr_label); 2087 obj = SLOT(kslabel); 2088 2089 if (!biba_dominate_effective(obj, subj)) 2090 return (EACCES); 2091 2092 return (0); 2093} 2094 2095static int 2096biba_proc_check_debug(struct ucred *cred, struct proc *p) 2097{ 2098 struct mac_biba *subj, *obj; 2099 2100 if (!biba_enabled) 2101 return (0); 2102 2103 subj = SLOT(cred->cr_label); 2104 obj = SLOT(p->p_ucred->cr_label); 2105 2106 /* XXX: range checks */ 2107 if (!biba_dominate_effective(obj, subj)) 2108 return (ESRCH); 2109 if (!biba_dominate_effective(subj, obj)) 2110 return (EACCES); 2111 2112 return (0); 2113} 2114 2115static int 2116biba_proc_check_sched(struct ucred *cred, struct proc *p) 2117{ 2118 struct mac_biba *subj, *obj; 2119 2120 if (!biba_enabled) 2121 return (0); 2122 2123 subj = SLOT(cred->cr_label); 2124 obj = SLOT(p->p_ucred->cr_label); 2125 2126 /* XXX: range checks */ 2127 if (!biba_dominate_effective(obj, subj)) 2128 return (ESRCH); 2129 if (!biba_dominate_effective(subj, obj)) 2130 return (EACCES); 2131 2132 return (0); 2133} 2134 2135static int 2136biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 2137{ 2138 struct mac_biba *subj, *obj; 2139 2140 if (!biba_enabled) 2141 return (0); 2142 2143 subj = SLOT(cred->cr_label); 2144 obj = SLOT(p->p_ucred->cr_label); 2145 2146 /* XXX: range checks */ 2147 if (!biba_dominate_effective(obj, subj)) 2148 return (ESRCH); 2149 if (!biba_dominate_effective(subj, obj)) 2150 return (EACCES); 2151 2152 return (0); 2153} 2154 2155static int 2156biba_socket_check_deliver(struct socket *so, struct label *solabel, 2157 struct mbuf *m, struct label *mlabel) 2158{ 2159 struct mac_biba *p, *s; 2160 2161 if (!biba_enabled) 2162 return (0); 2163 2164 p = SLOT(mlabel); 2165 s = SLOT(solabel); 2166 2167 return (biba_equal_effective(p, s) ? 0 : EACCES); 2168} 2169 2170static int 2171biba_socket_check_relabel(struct ucred *cred, struct socket *so, 2172 struct label *solabel, struct label *newlabel) 2173{ 2174 struct mac_biba *subj, *obj, *new; 2175 int error; 2176 2177 new = SLOT(newlabel); 2178 subj = SLOT(cred->cr_label); 2179 obj = SLOT(solabel); 2180 2181 /* 2182 * If there is a Biba label update for the socket, it may be an 2183 * update of effective. 2184 */ 2185 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2186 if (error) 2187 return (error); 2188 2189 /* 2190 * To relabel a socket, the old socket effective must be in the 2191 * subject range. 2192 */ 2193 if (!biba_effective_in_range(obj, subj)) 2194 return (EPERM); 2195 2196 /* 2197 * If the Biba label is to be changed, authorize as appropriate. 2198 */ 2199 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2200 /* 2201 * To relabel a socket, the new socket effective must be in 2202 * the subject range. 2203 */ 2204 if (!biba_effective_in_range(new, subj)) 2205 return (EPERM); 2206 2207 /* 2208 * To change the Biba label on the socket to contain EQUAL, 2209 * the subject must have appropriate privilege. 2210 */ 2211 if (biba_contains_equal(new)) { 2212 error = biba_subject_privileged(subj); 2213 if (error) 2214 return (error); 2215 } 2216 } 2217 2218 return (0); 2219} 2220 2221static int 2222biba_socket_check_visible(struct ucred *cred, struct socket *so, 2223 struct label *solabel) 2224{ 2225 struct mac_biba *subj, *obj; 2226 2227 if (!biba_enabled) 2228 return (0); 2229 2230 subj = SLOT(cred->cr_label); 2231 obj = SLOT(solabel); 2232 2233 if (!biba_dominate_effective(obj, subj)) 2234 return (ENOENT); 2235 2236 return (0); 2237} 2238 2239/* 2240 * Some system privileges are allowed regardless of integrity grade; others 2241 * are allowed only when running with privilege with respect to the Biba 2242 * policy as they might otherwise allow bypassing of the integrity policy. 2243 */ 2244static int 2245biba_priv_check(struct ucred *cred, int priv) 2246{ 2247 struct mac_biba *subj; 2248 int error; 2249 2250 if (!biba_enabled) 2251 return (0); 2252 2253 /* 2254 * Exempt only specific privileges from the Biba integrity policy. 2255 */ 2256 switch (priv) { 2257 case PRIV_KTRACE: 2258 case PRIV_MSGBUF: 2259 2260 /* 2261 * Allow processes to manipulate basic process audit properties, and 2262 * to submit audit records. 2263 */ 2264 case PRIV_AUDIT_GETAUDIT: 2265 case PRIV_AUDIT_SETAUDIT: 2266 case PRIV_AUDIT_SUBMIT: 2267 2268 /* 2269 * Allow processes to manipulate their regular UNIX credentials. 2270 */ 2271 case PRIV_CRED_SETUID: 2272 case PRIV_CRED_SETEUID: 2273 case PRIV_CRED_SETGID: 2274 case PRIV_CRED_SETEGID: 2275 case PRIV_CRED_SETGROUPS: 2276 case PRIV_CRED_SETREUID: 2277 case PRIV_CRED_SETREGID: 2278 case PRIV_CRED_SETRESUID: 2279 case PRIV_CRED_SETRESGID: 2280 2281 /* 2282 * Allow processes to perform system monitoring. 2283 */ 2284 case PRIV_SEEOTHERGIDS: 2285 case PRIV_SEEOTHERUIDS: 2286 break; 2287 2288 /* 2289 * Allow access to general process debugging facilities. We 2290 * separately control debugging based on MAC label. 2291 */ 2292 case PRIV_DEBUG_DIFFCRED: 2293 case PRIV_DEBUG_SUGID: 2294 case PRIV_DEBUG_UNPRIV: 2295 2296 /* 2297 * Allow manipulating jails. 2298 */ 2299 case PRIV_JAIL_ATTACH: 2300 2301 /* 2302 * Allow privilege with respect to the Partition policy, but not the 2303 * Privs policy. 2304 */ 2305 case PRIV_MAC_PARTITION: 2306 2307 /* 2308 * Allow privilege with respect to process resource limits and login 2309 * context. 2310 */ 2311 case PRIV_PROC_LIMIT: 2312 case PRIV_PROC_SETLOGIN: 2313 case PRIV_PROC_SETRLIMIT: 2314 2315 /* 2316 * Allow System V and POSIX IPC privileges. 2317 */ 2318 case PRIV_IPC_READ: 2319 case PRIV_IPC_WRITE: 2320 case PRIV_IPC_ADMIN: 2321 case PRIV_IPC_MSGSIZE: 2322 case PRIV_MQ_ADMIN: 2323 2324 /* 2325 * Allow certain scheduler manipulations -- possibly this should be 2326 * controlled by more fine-grained policy, as potentially low 2327 * integrity processes can deny CPU to higher integrity ones. 2328 */ 2329 case PRIV_SCHED_DIFFCRED: 2330 case PRIV_SCHED_SETPRIORITY: 2331 case PRIV_SCHED_RTPRIO: 2332 case PRIV_SCHED_SETPOLICY: 2333 case PRIV_SCHED_SET: 2334 case PRIV_SCHED_SETPARAM: 2335 2336 /* 2337 * More IPC privileges. 2338 */ 2339 case PRIV_SEM_WRITE: 2340 2341 /* 2342 * Allow signaling privileges subject to integrity policy. 2343 */ 2344 case PRIV_SIGNAL_DIFFCRED: 2345 case PRIV_SIGNAL_SUGID: 2346 2347 /* 2348 * Allow access to only limited sysctls from lower integrity levels; 2349 * piggy-back on the Jail definition. 2350 */ 2351 case PRIV_SYSCTL_WRITEJAIL: 2352 2353 /* 2354 * Allow TTY-based privileges, subject to general device access using 2355 * labels on TTY device nodes, but not console privilege. 2356 */ 2357 case PRIV_TTY_DRAINWAIT: 2358 case PRIV_TTY_DTRWAIT: 2359 case PRIV_TTY_EXCLUSIVE: 2360 case PRIV_TTY_PRISON: 2361 case PRIV_TTY_STI: 2362 case PRIV_TTY_SETA: 2363 2364 /* 2365 * Grant most VFS privileges, as almost all are in practice bounded 2366 * by more specific checks using labels. 2367 */ 2368 case PRIV_VFS_READ: 2369 case PRIV_VFS_WRITE: 2370 case PRIV_VFS_ADMIN: 2371 case PRIV_VFS_EXEC: 2372 case PRIV_VFS_LOOKUP: 2373 case PRIV_VFS_CHFLAGS_DEV: 2374 case PRIV_VFS_CHOWN: 2375 case PRIV_VFS_CHROOT: 2376 case PRIV_VFS_RETAINSUGID: 2377 case PRIV_VFS_EXCEEDQUOTA: 2378 case PRIV_VFS_FCHROOT: 2379 case PRIV_VFS_FHOPEN: 2380 case PRIV_VFS_FHSTATFS: 2381 case PRIV_VFS_GENERATION: 2382 case PRIV_VFS_GETFH: 2383 case PRIV_VFS_GETQUOTA: 2384 case PRIV_VFS_LINK: 2385 case PRIV_VFS_MOUNT: 2386 case PRIV_VFS_MOUNT_OWNER: 2387 case PRIV_VFS_MOUNT_PERM: 2388 case PRIV_VFS_MOUNT_SUIDDIR: 2389 case PRIV_VFS_MOUNT_NONUSER: 2390 case PRIV_VFS_SETGID: 2391 case PRIV_VFS_STICKYFILE: 2392 case PRIV_VFS_SYSFLAGS: 2393 case PRIV_VFS_UNMOUNT: 2394 2395 /* 2396 * Allow VM privileges; it would be nice if these were subject to 2397 * resource limits. 2398 */ 2399 case PRIV_VM_MADV_PROTECT: 2400 case PRIV_VM_MLOCK: 2401 case PRIV_VM_MUNLOCK: 2402 2403 /* 2404 * Allow some but not all network privileges. In general, dont allow 2405 * reconfiguring the network stack, just normal use. 2406 */ 2407 case PRIV_NETATALK_RESERVEDPORT: 2408 case PRIV_NETINET_RESERVEDPORT: 2409 case PRIV_NETINET_RAW: 2410 case PRIV_NETINET_REUSEPORT: 2411 case PRIV_NETIPX_RESERVEDPORT: 2412 case PRIV_NETIPX_RAW: 2413 break; 2414 2415 /* 2416 * All remaining system privileges are allow only if the process 2417 * holds privilege with respect to the Biba policy. 2418 */ 2419 default: 2420 subj = SLOT(cred->cr_label); 2421 error = biba_subject_privileged(subj); 2422 if (error) 2423 return (error); 2424 } 2425 return (0); 2426} 2427 2428static int 2429biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2430 struct label *vplabel) 2431{ 2432 struct mac_biba *subj, *obj; 2433 int error; 2434 2435 if (!biba_enabled) 2436 return (0); 2437 2438 subj = SLOT(cred->cr_label); 2439 2440 error = biba_subject_privileged(subj); 2441 if (error) 2442 return (error); 2443 2444 if (vplabel == NULL) 2445 return (0); 2446 2447 obj = SLOT(vplabel); 2448 if (!biba_high_effective(obj)) 2449 return (EACCES); 2450 2451 return (0); 2452} 2453 2454static int 2455biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2456 struct label *vplabel) 2457{ 2458 struct mac_biba *subj, *obj; 2459 int error; 2460 2461 if (!biba_enabled) 2462 return (0); 2463 2464 subj = SLOT(cred->cr_label); 2465 2466 error = biba_subject_privileged(subj); 2467 if (error) 2468 return (error); 2469 2470 if (vplabel == NULL) 2471 return (0); 2472 2473 obj = SLOT(vplabel); 2474 if (!biba_high_effective(obj)) 2475 return (EACCES); 2476 2477 return (0); 2478} 2479 2480static int 2481biba_system_check_auditon(struct ucred *cred, int cmd) 2482{ 2483 struct mac_biba *subj; 2484 int error; 2485 2486 if (!biba_enabled) 2487 return (0); 2488 2489 subj = SLOT(cred->cr_label); 2490 2491 error = biba_subject_privileged(subj); 2492 if (error) 2493 return (error); 2494 2495 return (0); 2496} 2497 2498static int 2499biba_system_check_swapon(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 obj = SLOT(vplabel); 2510 2511 error = biba_subject_privileged(subj); 2512 if (error) 2513 return (error); 2514 2515 if (!biba_high_effective(obj)) 2516 return (EACCES); 2517 2518 return (0); 2519} 2520 2521static int 2522biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2523 struct label *label) 2524{ 2525 struct mac_biba *subj; 2526 int error; 2527 2528 if (!biba_enabled) 2529 return (0); 2530 2531 subj = SLOT(cred->cr_label); 2532 2533 error = biba_subject_privileged(subj); 2534 if (error) 2535 return (error); 2536 2537 return (0); 2538} 2539 2540static int 2541biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2542 void *arg1, int arg2, struct sysctl_req *req) 2543{ 2544 struct mac_biba *subj; 2545 int error; 2546 2547 if (!biba_enabled) 2548 return (0); 2549 2550 subj = SLOT(cred->cr_label); 2551 2552 /* 2553 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2554 * but also require privilege to change them. 2555 */ 2556 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2557 if (!biba_subject_dominate_high(subj)) 2558 return (EACCES); 2559 2560 error = biba_subject_privileged(subj); 2561 if (error) 2562 return (error); 2563 } 2564 2565 return (0); 2566} 2567 2568static int 2569biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2570 struct label *dvplabel) 2571{ 2572 struct mac_biba *subj, *obj; 2573 2574 if (!biba_enabled) 2575 return (0); 2576 2577 subj = SLOT(cred->cr_label); 2578 obj = SLOT(dvplabel); 2579 2580 if (!biba_dominate_effective(obj, subj)) 2581 return (EACCES); 2582 2583 return (0); 2584} 2585 2586static int 2587biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2588 struct label *dvplabel) 2589{ 2590 struct mac_biba *subj, *obj; 2591 2592 if (!biba_enabled) 2593 return (0); 2594 2595 subj = SLOT(cred->cr_label); 2596 obj = SLOT(dvplabel); 2597 2598 if (!biba_dominate_effective(obj, subj)) 2599 return (EACCES); 2600 2601 return (0); 2602} 2603 2604static int 2605biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2606 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2607{ 2608 struct mac_biba *subj, *obj; 2609 2610 if (!biba_enabled) 2611 return (0); 2612 2613 subj = SLOT(cred->cr_label); 2614 obj = SLOT(dvplabel); 2615 2616 if (!biba_dominate_effective(subj, obj)) 2617 return (EACCES); 2618 2619 return (0); 2620} 2621 2622static int 2623biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2624 struct label *vplabel, acl_type_t type) 2625{ 2626 struct mac_biba *subj, *obj; 2627 2628 if (!biba_enabled) 2629 return (0); 2630 2631 subj = SLOT(cred->cr_label); 2632 obj = SLOT(vplabel); 2633 2634 if (!biba_dominate_effective(subj, obj)) 2635 return (EACCES); 2636 2637 return (0); 2638} 2639 2640static int 2641biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2642 struct label *vplabel, int attrnamespace, const char *name) 2643{ 2644 struct mac_biba *subj, *obj; 2645 2646 if (!biba_enabled) 2647 return (0); 2648 2649 subj = SLOT(cred->cr_label); 2650 obj = SLOT(vplabel); 2651 2652 if (!biba_dominate_effective(subj, obj)) 2653 return (EACCES); 2654 2655 return (0); 2656} 2657 2658static int 2659biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2660 struct label *vplabel, struct image_params *imgp, 2661 struct label *execlabel) 2662{ 2663 struct mac_biba *subj, *obj, *exec; 2664 int error; 2665 2666 if (execlabel != NULL) { 2667 /* 2668 * We currently don't permit labels to be changed at 2669 * exec-time as part of Biba, so disallow non-NULL Biba label 2670 * elements in the execlabel. 2671 */ 2672 exec = SLOT(execlabel); 2673 error = biba_atmostflags(exec, 0); 2674 if (error) 2675 return (error); 2676 } 2677 2678 if (!biba_enabled) 2679 return (0); 2680 2681 subj = SLOT(cred->cr_label); 2682 obj = SLOT(vplabel); 2683 2684 if (!biba_dominate_effective(obj, subj)) 2685 return (EACCES); 2686 2687 return (0); 2688} 2689 2690static int 2691biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2692 struct label *vplabel, acl_type_t type) 2693{ 2694 struct mac_biba *subj, *obj; 2695 2696 if (!biba_enabled) 2697 return (0); 2698 2699 subj = SLOT(cred->cr_label); 2700 obj = SLOT(vplabel); 2701 2702 if (!biba_dominate_effective(obj, subj)) 2703 return (EACCES); 2704 2705 return (0); 2706} 2707 2708static int 2709biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2710 struct label *vplabel, int attrnamespace, const char *name, 2711 struct uio *uio) 2712{ 2713 struct mac_biba *subj, *obj; 2714 2715 if (!biba_enabled) 2716 return (0); 2717 2718 subj = SLOT(cred->cr_label); 2719 obj = SLOT(vplabel); 2720 2721 if (!biba_dominate_effective(obj, subj)) 2722 return (EACCES); 2723 2724 return (0); 2725} 2726 2727static int 2728biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2729 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2730 struct componentname *cnp) 2731{ 2732 struct mac_biba *subj, *obj; 2733 2734 if (!biba_enabled) 2735 return (0); 2736 2737 subj = SLOT(cred->cr_label); 2738 obj = SLOT(dvplabel); 2739 2740 if (!biba_dominate_effective(subj, obj)) 2741 return (EACCES); 2742 2743 obj = SLOT(vplabel); 2744 2745 if (!biba_dominate_effective(subj, obj)) 2746 return (EACCES); 2747 2748 return (0); 2749} 2750 2751static int 2752biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2753 struct label *vplabel, int attrnamespace) 2754{ 2755 struct mac_biba *subj, *obj; 2756 2757 if (!biba_enabled) 2758 return (0); 2759 2760 subj = SLOT(cred->cr_label); 2761 obj = SLOT(vplabel); 2762 2763 if (!biba_dominate_effective(obj, subj)) 2764 return (EACCES); 2765 2766 return (0); 2767} 2768 2769static int 2770biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2771 struct label *dvplabel, struct componentname *cnp) 2772{ 2773 struct mac_biba *subj, *obj; 2774 2775 if (!biba_enabled) 2776 return (0); 2777 2778 subj = SLOT(cred->cr_label); 2779 obj = SLOT(dvplabel); 2780 2781 if (!biba_dominate_effective(obj, subj)) 2782 return (EACCES); 2783 2784 return (0); 2785} 2786 2787static int 2788biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2789 struct label *vplabel, int prot, int flags) 2790{ 2791 struct mac_biba *subj, *obj; 2792 2793 /* 2794 * Rely on the use of open()-time protections to handle 2795 * non-revocation cases. 2796 */ 2797 if (!biba_enabled || !revocation_enabled) 2798 return (0); 2799 2800 subj = SLOT(cred->cr_label); 2801 obj = SLOT(vplabel); 2802 2803 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2804 if (!biba_dominate_effective(obj, subj)) 2805 return (EACCES); 2806 } 2807 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2808 if (!biba_dominate_effective(subj, obj)) 2809 return (EACCES); 2810 } 2811 2812 return (0); 2813} 2814 2815static int 2816biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2817 struct label *vplabel, int acc_mode) 2818{ 2819 struct mac_biba *subj, *obj; 2820 2821 if (!biba_enabled) 2822 return (0); 2823 2824 subj = SLOT(cred->cr_label); 2825 obj = SLOT(vplabel); 2826 2827 /* XXX privilege override for admin? */ 2828 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2829 if (!biba_dominate_effective(obj, subj)) 2830 return (EACCES); 2831 } 2832 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2833 if (!biba_dominate_effective(subj, obj)) 2834 return (EACCES); 2835 } 2836 2837 return (0); 2838} 2839 2840static int 2841biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2842 struct vnode *vp, struct label *vplabel) 2843{ 2844 struct mac_biba *subj, *obj; 2845 2846 if (!biba_enabled || !revocation_enabled) 2847 return (0); 2848 2849 subj = SLOT(active_cred->cr_label); 2850 obj = SLOT(vplabel); 2851 2852 if (!biba_dominate_effective(obj, subj)) 2853 return (EACCES); 2854 2855 return (0); 2856} 2857 2858static int 2859biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2860 struct vnode *vp, struct label *vplabel) 2861{ 2862 struct mac_biba *subj, *obj; 2863 2864 if (!biba_enabled || !revocation_enabled) 2865 return (0); 2866 2867 subj = SLOT(active_cred->cr_label); 2868 obj = SLOT(vplabel); 2869 2870 if (!biba_dominate_effective(obj, subj)) 2871 return (EACCES); 2872 2873 return (0); 2874} 2875 2876static int 2877biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2878 struct label *dvplabel) 2879{ 2880 struct mac_biba *subj, *obj; 2881 2882 if (!biba_enabled) 2883 return (0); 2884 2885 subj = SLOT(cred->cr_label); 2886 obj = SLOT(dvplabel); 2887 2888 if (!biba_dominate_effective(obj, subj)) 2889 return (EACCES); 2890 2891 return (0); 2892} 2893 2894static int 2895biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2896 struct label *vplabel) 2897{ 2898 struct mac_biba *subj, *obj; 2899 2900 if (!biba_enabled) 2901 return (0); 2902 2903 subj = SLOT(cred->cr_label); 2904 obj = SLOT(vplabel); 2905 2906 if (!biba_dominate_effective(obj, subj)) 2907 return (EACCES); 2908 2909 return (0); 2910} 2911 2912static int 2913biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2914 struct label *vplabel, struct label *newlabel) 2915{ 2916 struct mac_biba *old, *new, *subj; 2917 int error; 2918 2919 old = SLOT(vplabel); 2920 new = SLOT(newlabel); 2921 subj = SLOT(cred->cr_label); 2922 2923 /* 2924 * If there is a Biba label update for the vnode, it must be a 2925 * effective label. 2926 */ 2927 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2928 if (error) 2929 return (error); 2930 2931 /* 2932 * To perform a relabel of the vnode (Biba label or not), Biba must 2933 * authorize the relabel. 2934 */ 2935 if (!biba_effective_in_range(old, subj)) 2936 return (EPERM); 2937 2938 /* 2939 * If the Biba label is to be changed, authorize as appropriate. 2940 */ 2941 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2942 /* 2943 * To change the Biba label on a vnode, the new vnode label 2944 * must be in the subject range. 2945 */ 2946 if (!biba_effective_in_range(new, subj)) 2947 return (EPERM); 2948 2949 /* 2950 * To change the Biba label on the vnode to be EQUAL, the 2951 * subject must have appropriate privilege. 2952 */ 2953 if (biba_contains_equal(new)) { 2954 error = biba_subject_privileged(subj); 2955 if (error) 2956 return (error); 2957 } 2958 } 2959 2960 return (0); 2961} 2962 2963static int 2964biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 2965 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2966 struct componentname *cnp) 2967{ 2968 struct mac_biba *subj, *obj; 2969 2970 if (!biba_enabled) 2971 return (0); 2972 2973 subj = SLOT(cred->cr_label); 2974 obj = SLOT(dvplabel); 2975 2976 if (!biba_dominate_effective(subj, obj)) 2977 return (EACCES); 2978 2979 obj = SLOT(vplabel); 2980 2981 if (!biba_dominate_effective(subj, obj)) 2982 return (EACCES); 2983 2984 return (0); 2985} 2986 2987static int 2988biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 2989 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2990 int samedir, struct componentname *cnp) 2991{ 2992 struct mac_biba *subj, *obj; 2993 2994 if (!biba_enabled) 2995 return (0); 2996 2997 subj = SLOT(cred->cr_label); 2998 obj = SLOT(dvplabel); 2999 3000 if (!biba_dominate_effective(subj, obj)) 3001 return (EACCES); 3002 3003 if (vp != NULL) { 3004 obj = SLOT(vplabel); 3005 3006 if (!biba_dominate_effective(subj, obj)) 3007 return (EACCES); 3008 } 3009 3010 return (0); 3011} 3012 3013static int 3014biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3015 struct label *vplabel) 3016{ 3017 struct mac_biba *subj, *obj; 3018 3019 if (!biba_enabled) 3020 return (0); 3021 3022 subj = SLOT(cred->cr_label); 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_setacl(struct ucred *cred, struct vnode *vp, 3033 struct label *vplabel, acl_type_t type, struct acl *acl) 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(vplabel); 3042 3043 if (!biba_dominate_effective(subj, obj)) 3044 return (EACCES); 3045 3046 return (0); 3047} 3048 3049static int 3050biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3051 struct label *vplabel, int attrnamespace, const char *name, 3052 struct uio *uio) 3053{ 3054 struct mac_biba *subj, *obj; 3055 3056 if (!biba_enabled) 3057 return (0); 3058 3059 subj = SLOT(cred->cr_label); 3060 obj = SLOT(vplabel); 3061 3062 if (!biba_dominate_effective(subj, obj)) 3063 return (EACCES); 3064 3065 /* XXX: protect the MAC EA in a special way? */ 3066 3067 return (0); 3068} 3069 3070static int 3071biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3072 struct label *vplabel, u_long flags) 3073{ 3074 struct mac_biba *subj, *obj; 3075 3076 if (!biba_enabled) 3077 return (0); 3078 3079 subj = SLOT(cred->cr_label); 3080 obj = SLOT(vplabel); 3081 3082 if (!biba_dominate_effective(subj, obj)) 3083 return (EACCES); 3084 3085 return (0); 3086} 3087 3088static int 3089biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3090 struct label *vplabel, mode_t mode) 3091{ 3092 struct mac_biba *subj, *obj; 3093 3094 if (!biba_enabled) 3095 return (0); 3096 3097 subj = SLOT(cred->cr_label); 3098 obj = SLOT(vplabel); 3099 3100 if (!biba_dominate_effective(subj, obj)) 3101 return (EACCES); 3102 3103 return (0); 3104} 3105 3106static int 3107biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3108 struct label *vplabel, uid_t uid, gid_t gid) 3109{ 3110 struct mac_biba *subj, *obj; 3111 3112 if (!biba_enabled) 3113 return (0); 3114 3115 subj = SLOT(cred->cr_label); 3116 obj = SLOT(vplabel); 3117 3118 if (!biba_dominate_effective(subj, obj)) 3119 return (EACCES); 3120 3121 return (0); 3122} 3123 3124static int 3125biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3126 struct label *vplabel, struct timespec atime, struct timespec mtime) 3127{ 3128 struct mac_biba *subj, *obj; 3129 3130 if (!biba_enabled) 3131 return (0); 3132 3133 subj = SLOT(cred->cr_label); 3134 obj = SLOT(vplabel); 3135 3136 if (!biba_dominate_effective(subj, obj)) 3137 return (EACCES); 3138 3139 return (0); 3140} 3141 3142static int 3143biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3144 struct vnode *vp, struct label *vplabel) 3145{ 3146 struct mac_biba *subj, *obj; 3147 3148 if (!biba_enabled) 3149 return (0); 3150 3151 subj = SLOT(active_cred->cr_label); 3152 obj = SLOT(vplabel); 3153 3154 if (!biba_dominate_effective(obj, subj)) 3155 return (EACCES); 3156 3157 return (0); 3158} 3159 3160static int 3161biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3162 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3163 struct componentname *cnp) 3164{ 3165 struct mac_biba *subj, *obj; 3166 3167 if (!biba_enabled) 3168 return (0); 3169 3170 subj = SLOT(cred->cr_label); 3171 obj = SLOT(dvplabel); 3172 3173 if (!biba_dominate_effective(subj, obj)) 3174 return (EACCES); 3175 3176 obj = SLOT(vplabel); 3177 3178 if (!biba_dominate_effective(subj, obj)) 3179 return (EACCES); 3180 3181 return (0); 3182} 3183 3184static int 3185biba_vnode_check_write(struct ucred *active_cred, 3186 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3187{ 3188 struct mac_biba *subj, *obj; 3189 3190 if (!biba_enabled || !revocation_enabled) 3191 return (0); 3192 3193 subj = SLOT(active_cred->cr_label); 3194 obj = SLOT(vplabel); 3195 3196 if (!biba_dominate_effective(subj, obj)) 3197 return (EACCES); 3198 3199 return (0); 3200} 3201 3202static void 3203biba_associate_nfsd_label(struct ucred *cred) 3204{ 3205 struct mac_biba *label; 3206 3207 label = SLOT(cred->cr_label); 3208 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); 3209 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 3210 0, NULL); 3211} 3212 3213static void 3214biba_init_syncache_from_inpcb(struct label *label, struct inpcb *inp) 3215{ 3216 struct mac_biba *source, *dest; 3217 3218 source = SLOT(inp->inp_label); 3219 dest = SLOT(label); 3220 biba_copy_effective(source, dest); 3221} 3222 3223static void 3224biba_create_mbuf_from_syncache(struct label *sc_label, struct mbuf *m, 3225 struct label *mlabel) 3226{ 3227 struct mac_biba *source, *dest; 3228 3229 source = SLOT(sc_label); 3230 dest = SLOT(mlabel); 3231 biba_copy_effective(source, dest); 3232} 3233 3234static struct mac_policy_ops mac_biba_ops = 3235{ 3236 .mpo_init = biba_init, 3237 .mpo_bpfdesc_init_label = biba_init_label, 3238 .mpo_cred_init_label = biba_init_label, 3239 .mpo_devfs_init_label = biba_init_label, 3240 .mpo_ifnet_init_label = biba_init_label, 3241 .mpo_inpcb_init_label = biba_init_label_waitcheck, 3242 .mpo_init_syncache_label = biba_init_label_waitcheck, 3243 .mpo_sysvmsg_init_label = biba_init_label, 3244 .mpo_sysvmsq_init_label = biba_init_label, 3245 .mpo_sysvsem_init_label = biba_init_label, 3246 .mpo_sysvshm_init_label = biba_init_label, 3247 .mpo_ipq_init_label = biba_init_label_waitcheck, 3248 .mpo_mbuf_init_label = biba_init_label_waitcheck, 3249 .mpo_mount_init_label = biba_init_label, 3250 .mpo_pipe_init_label = biba_init_label, 3251 .mpo_posixsem_init_label = biba_init_label, 3252 .mpo_socket_init_label = biba_init_label_waitcheck, 3253 .mpo_socketpeer_init_label = biba_init_label_waitcheck, 3254 .mpo_init_syncache_from_inpcb = biba_init_syncache_from_inpcb, 3255 .mpo_vnode_init_label = biba_init_label, 3256 .mpo_bpfdesc_destroy_label = biba_destroy_label, 3257 .mpo_cred_destroy_label = biba_destroy_label, 3258 .mpo_devfs_destroy_label = biba_destroy_label, 3259 .mpo_ifnet_destroy_label = biba_destroy_label, 3260 .mpo_inpcb_destroy_label = biba_destroy_label, 3261 .mpo_destroy_syncache_label = biba_destroy_label, 3262 .mpo_sysvmsg_destroy_label = biba_destroy_label, 3263 .mpo_sysvmsq_destroy_label = biba_destroy_label, 3264 .mpo_sysvsem_destroy_label = biba_destroy_label, 3265 .mpo_sysvshm_destroy_label = biba_destroy_label, 3266 .mpo_ipq_destroy_label = biba_destroy_label, 3267 .mpo_mbuf_destroy_label = biba_destroy_label, 3268 .mpo_mount_destroy_label = biba_destroy_label, 3269 .mpo_pipe_destroy_label = biba_destroy_label, 3270 .mpo_posixsem_destroy_label = biba_destroy_label, 3271 .mpo_socket_destroy_label = biba_destroy_label, 3272 .mpo_socketpeer_destroy_label = biba_destroy_label, 3273 .mpo_vnode_destroy_label = biba_destroy_label, 3274 .mpo_cred_copy_label = biba_copy_label, 3275 .mpo_ifnet_copy_label = biba_copy_label, 3276 .mpo_mbuf_copy_label = biba_copy_label, 3277 .mpo_pipe_copy_label = biba_copy_label, 3278 .mpo_socket_copy_label = biba_copy_label, 3279 .mpo_vnode_copy_label = biba_copy_label, 3280 .mpo_cred_externalize_label = biba_externalize_label, 3281 .mpo_ifnet_externalize_label = biba_externalize_label, 3282 .mpo_pipe_externalize_label = biba_externalize_label, 3283 .mpo_socket_externalize_label = biba_externalize_label, 3284 .mpo_socketpeer_externalize_label = biba_externalize_label, 3285 .mpo_vnode_externalize_label = biba_externalize_label, 3286 .mpo_cred_internalize_label = biba_internalize_label, 3287 .mpo_ifnet_internalize_label = biba_internalize_label, 3288 .mpo_pipe_internalize_label = biba_internalize_label, 3289 .mpo_socket_internalize_label = biba_internalize_label, 3290 .mpo_vnode_internalize_label = biba_internalize_label, 3291 .mpo_devfs_create_device = biba_devfs_create_device, 3292 .mpo_devfs_create_directory = biba_devfs_create_directory, 3293 .mpo_devfs_create_symlink = biba_devfs_create_symlink, 3294 .mpo_mount_create = biba_mount_create, 3295 .mpo_vnode_relabel = biba_vnode_relabel, 3296 .mpo_devfs_update = biba_devfs_update, 3297 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, 3298 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, 3299 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, 3300 .mpo_vnode_create_extattr = biba_vnode_create_extattr, 3301 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, 3302 .mpo_socket_create_mbuf = biba_socket_create_mbuf, 3303 .mpo_create_mbuf_from_syncache = biba_create_mbuf_from_syncache, 3304 .mpo_pipe_create = biba_pipe_create, 3305 .mpo_posixsem_create = biba_posixsem_create, 3306 .mpo_socket_create = biba_socket_create, 3307 .mpo_socket_newconn = biba_socket_newconn, 3308 .mpo_pipe_relabel = biba_pipe_relabel, 3309 .mpo_socket_relabel = biba_socket_relabel, 3310 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, 3311 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, 3312 .mpo_bpfdesc_create = biba_bpfdesc_create, 3313 .mpo_ipq_reassemble = biba_ipq_reassemble, 3314 .mpo_netinet_fragment = biba_netinet_fragment, 3315 .mpo_ifnet_create = biba_ifnet_create, 3316 .mpo_inpcb_create = biba_inpcb_create, 3317 .mpo_sysvmsg_create = biba_sysvmsg_create, 3318 .mpo_sysvmsq_create = biba_sysvmsq_create, 3319 .mpo_sysvsem_create = biba_sysvsem_create, 3320 .mpo_sysvshm_create = biba_sysvshm_create, 3321 .mpo_ipq_create = biba_ipq_create, 3322 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, 3323 .mpo_create_mbuf_linklayer = biba_create_mbuf_linklayer, 3324 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, 3325 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, 3326 .mpo_mbuf_create_multicast_encap = biba_mbuf_create_multicast_encap, 3327 .mpo_mbuf_create_netlayer = biba_mbuf_create_netlayer, 3328 .mpo_ipq_match = biba_ipq_match, 3329 .mpo_ifnet_relabel = biba_ifnet_relabel, 3330 .mpo_ipq_update = biba_ipq_update, 3331 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, 3332 .mpo_proc_create_swapper = biba_proc_create_swapper, 3333 .mpo_proc_create_init = biba_proc_create_init, 3334 .mpo_cred_relabel = biba_cred_relabel, 3335 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3336 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3337 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3338 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3339 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3340 .mpo_cred_check_relabel = biba_cred_check_relabel, 3341 .mpo_cred_check_visible = biba_cred_check_visible, 3342 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3343 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3344 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3345 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3346 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3347 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3348 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3349 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3350 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3351 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3352 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3353 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3354 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3355 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3356 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3357 .mpo_kld_check_load = biba_kld_check_load, 3358 .mpo_mount_check_stat = biba_mount_check_stat, 3359 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3360 .mpo_pipe_check_poll = biba_pipe_check_poll, 3361 .mpo_pipe_check_read = biba_pipe_check_read, 3362 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3363 .mpo_pipe_check_stat = biba_pipe_check_stat, 3364 .mpo_pipe_check_write = biba_pipe_check_write, 3365 .mpo_posixsem_check_destroy = biba_posixsem_check_write, 3366 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3367 .mpo_posixsem_check_open = biba_posixsem_check_write, 3368 .mpo_posixsem_check_post = biba_posixsem_check_write, 3369 .mpo_posixsem_check_unlink = biba_posixsem_check_write, 3370 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3371 .mpo_proc_check_debug = biba_proc_check_debug, 3372 .mpo_proc_check_sched = biba_proc_check_sched, 3373 .mpo_proc_check_signal = biba_proc_check_signal, 3374 .mpo_socket_check_deliver = biba_socket_check_deliver, 3375 .mpo_socket_check_relabel = biba_socket_check_relabel, 3376 .mpo_socket_check_visible = biba_socket_check_visible, 3377 .mpo_system_check_acct = biba_system_check_acct, 3378 .mpo_system_check_auditctl = biba_system_check_auditctl, 3379 .mpo_system_check_auditon = biba_system_check_auditon, 3380 .mpo_system_check_swapon = biba_system_check_swapon, 3381 .mpo_system_check_swapoff = biba_system_check_swapoff, 3382 .mpo_system_check_sysctl = biba_system_check_sysctl, 3383 .mpo_vnode_check_access = biba_vnode_check_open, 3384 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3385 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3386 .mpo_vnode_check_create = biba_vnode_check_create, 3387 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3388 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3389 .mpo_vnode_check_exec = biba_vnode_check_exec, 3390 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3391 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3392 .mpo_vnode_check_link = biba_vnode_check_link, 3393 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3394 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3395 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3396 .mpo_vnode_check_open = biba_vnode_check_open, 3397 .mpo_vnode_check_poll = biba_vnode_check_poll, 3398 .mpo_vnode_check_read = biba_vnode_check_read, 3399 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3400 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3401 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3402 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3403 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3404 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3405 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3406 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3407 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3408 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3409 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3410 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3411 .mpo_vnode_check_stat = biba_vnode_check_stat, 3412 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3413 .mpo_vnode_check_write = biba_vnode_check_write, 3414 .mpo_associate_nfsd_label = biba_associate_nfsd_label, 3415 .mpo_mbuf_create_from_firewall = biba_mbuf_create_from_firewall, 3416 .mpo_priv_check = biba_priv_check, 3417}; 3418 3419MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3420 MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &biba_slot); 3421