mac_biba.c revision 173018
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 173018 2007-10-26 13:18:38Z 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_mbuf_create_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_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1376{ 1377 struct mac_biba *dest; 1378 1379 dest = SLOT(mlabel); 1380 1381 /* XXX: where is the label for the firewall really coming 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_proc_associate_nfsd(struct ucred *cred) 1414{ 1415 struct mac_biba *label; 1416 1417 label = SLOT(cred->cr_label); 1418 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); 1419 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 1420 0, NULL); 1421} 1422 1423static void 1424biba_cred_relabel(struct ucred *cred, struct label *newlabel) 1425{ 1426 struct mac_biba *source, *dest; 1427 1428 source = SLOT(newlabel); 1429 dest = SLOT(cred->cr_label); 1430 1431 biba_copy(source, dest); 1432} 1433 1434/* 1435 * Label cleanup/flush operations 1436 */ 1437static void 1438biba_sysvmsg_cleanup(struct label *msglabel) 1439{ 1440 1441 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 1442} 1443 1444static void 1445biba_sysvmsq_cleanup(struct label *msqlabel) 1446{ 1447 1448 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 1449} 1450 1451static void 1452biba_sysvsem_cleanup(struct label *semalabel) 1453{ 1454 1455 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 1456} 1457 1458static void 1459biba_sysvshm_cleanup(struct label *shmlabel) 1460{ 1461 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 1462} 1463 1464/* 1465 * Access control checks. 1466 */ 1467static int 1468biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 1469 struct ifnet *ifp, struct label *ifplabel) 1470{ 1471 struct mac_biba *a, *b; 1472 1473 if (!biba_enabled) 1474 return (0); 1475 1476 a = SLOT(dlabel); 1477 b = SLOT(ifplabel); 1478 1479 if (biba_equal_effective(a, b)) 1480 return (0); 1481 return (EACCES); 1482} 1483 1484static int 1485biba_cred_check_relabel(struct ucred *cred, struct label *newlabel) 1486{ 1487 struct mac_biba *subj, *new; 1488 int error; 1489 1490 subj = SLOT(cred->cr_label); 1491 new = SLOT(newlabel); 1492 1493 /* 1494 * If there is a Biba label update for the credential, it may 1495 * be an update of the effective, range, or both. 1496 */ 1497 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1498 if (error) 1499 return (error); 1500 1501 /* 1502 * If the Biba label is to be changed, authorize as appropriate. 1503 */ 1504 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1505 /* 1506 * If the change request modifies both the Biba label 1507 * effective and range, check that the new effective will be 1508 * in the new range. 1509 */ 1510 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 1511 MAC_BIBA_FLAGS_BOTH && 1512 !biba_effective_in_range(new, new)) 1513 return (EINVAL); 1514 1515 /* 1516 * To change the Biba effective label on a credential, the 1517 * new effective label must be in the current range. 1518 */ 1519 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && 1520 !biba_effective_in_range(new, subj)) 1521 return (EPERM); 1522 1523 /* 1524 * To change the Biba range on a credential, the new range 1525 * label must be in the current range. 1526 */ 1527 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1528 !biba_range_in_range(new, subj)) 1529 return (EPERM); 1530 1531 /* 1532 * To have EQUAL in any component of the new credential Biba 1533 * label, the subject must already have EQUAL in their label. 1534 */ 1535 if (biba_contains_equal(new)) { 1536 error = biba_subject_privileged(subj); 1537 if (error) 1538 return (error); 1539 } 1540 } 1541 1542 return (0); 1543} 1544 1545static int 1546biba_cred_check_visible(struct ucred *u1, struct ucred *u2) 1547{ 1548 struct mac_biba *subj, *obj; 1549 1550 if (!biba_enabled) 1551 return (0); 1552 1553 subj = SLOT(u1->cr_label); 1554 obj = SLOT(u2->cr_label); 1555 1556 /* XXX: range */ 1557 if (!biba_dominate_effective(obj, subj)) 1558 return (ESRCH); 1559 1560 return (0); 1561} 1562 1563static int 1564biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1565 struct label *ifplabel, struct label *newlabel) 1566{ 1567 struct mac_biba *subj, *new; 1568 int error; 1569 1570 subj = SLOT(cred->cr_label); 1571 new = SLOT(newlabel); 1572 1573 /* 1574 * If there is a Biba label update for the interface, it may be an 1575 * update of the effective, range, or both. 1576 */ 1577 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1578 if (error) 1579 return (error); 1580 1581 /* 1582 * Relabling network interfaces requires Biba privilege. 1583 */ 1584 error = biba_subject_privileged(subj); 1585 if (error) 1586 return (error); 1587 1588 return (0); 1589} 1590 1591static int 1592biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1593 struct mbuf *m, struct label *mlabel) 1594{ 1595 struct mac_biba *p, *i; 1596 1597 if (!biba_enabled) 1598 return (0); 1599 1600 p = SLOT(mlabel); 1601 i = SLOT(ifplabel); 1602 1603 return (biba_effective_in_range(p, i) ? 0 : EACCES); 1604} 1605 1606static int 1607biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1608 struct mbuf *m, struct label *mlabel) 1609{ 1610 struct mac_biba *p, *i; 1611 1612 if (!biba_enabled) 1613 return (0); 1614 1615 p = SLOT(mlabel); 1616 i = SLOT(inplabel); 1617 1618 return (biba_equal_effective(p, i) ? 0 : EACCES); 1619} 1620 1621static int 1622biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 1623 struct label *msglabel) 1624{ 1625 struct mac_biba *subj, *obj; 1626 1627 if (!biba_enabled) 1628 return (0); 1629 1630 subj = SLOT(cred->cr_label); 1631 obj = SLOT(msglabel); 1632 1633 if (!biba_dominate_effective(obj, subj)) 1634 return (EACCES); 1635 1636 return (0); 1637} 1638 1639static int 1640biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 1641 struct label *msglabel) 1642{ 1643 struct mac_biba *subj, *obj; 1644 1645 if (!biba_enabled) 1646 return (0); 1647 1648 subj = SLOT(cred->cr_label); 1649 obj = SLOT(msglabel); 1650 1651 if (!biba_dominate_effective(subj, obj)) 1652 return (EACCES); 1653 1654 return (0); 1655} 1656 1657static int 1658biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 1659 struct label *msqklabel) 1660{ 1661 struct mac_biba *subj, *obj; 1662 1663 if (!biba_enabled) 1664 return (0); 1665 1666 subj = SLOT(cred->cr_label); 1667 obj = SLOT(msqklabel); 1668 1669 if (!biba_dominate_effective(obj, subj)) 1670 return (EACCES); 1671 1672 return (0); 1673} 1674 1675static int 1676biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 1677 struct label *msqklabel) 1678{ 1679 struct mac_biba *subj, *obj; 1680 1681 if (!biba_enabled) 1682 return (0); 1683 1684 subj = SLOT(cred->cr_label); 1685 obj = SLOT(msqklabel); 1686 1687 if (!biba_dominate_effective(subj, obj)) 1688 return (EACCES); 1689 1690 return (0); 1691} 1692 1693static int 1694biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 1695 struct label *msqklabel) 1696{ 1697 struct mac_biba *subj, *obj; 1698 1699 if (!biba_enabled) 1700 return (0); 1701 1702 subj = SLOT(cred->cr_label); 1703 obj = SLOT(msqklabel); 1704 1705 if (!biba_dominate_effective(obj, subj)) 1706 return (EACCES); 1707 1708 return (0); 1709} 1710 1711static int 1712biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 1713 struct label *msqklabel, int cmd) 1714{ 1715 struct mac_biba *subj, *obj; 1716 1717 if (!biba_enabled) 1718 return (0); 1719 1720 subj = SLOT(cred->cr_label); 1721 obj = SLOT(msqklabel); 1722 1723 switch(cmd) { 1724 case IPC_RMID: 1725 case IPC_SET: 1726 if (!biba_dominate_effective(subj, obj)) 1727 return (EACCES); 1728 break; 1729 1730 case IPC_STAT: 1731 if (!biba_dominate_effective(obj, subj)) 1732 return (EACCES); 1733 break; 1734 1735 default: 1736 return (EACCES); 1737 } 1738 1739 return (0); 1740} 1741 1742static int 1743biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 1744 struct label *semaklabel, int cmd) 1745{ 1746 struct mac_biba *subj, *obj; 1747 1748 if (!biba_enabled) 1749 return (0); 1750 1751 subj = SLOT(cred->cr_label); 1752 obj = SLOT(semaklabel); 1753 1754 switch(cmd) { 1755 case IPC_RMID: 1756 case IPC_SET: 1757 case SETVAL: 1758 case SETALL: 1759 if (!biba_dominate_effective(subj, obj)) 1760 return (EACCES); 1761 break; 1762 1763 case IPC_STAT: 1764 case GETVAL: 1765 case GETPID: 1766 case GETNCNT: 1767 case GETZCNT: 1768 case GETALL: 1769 if (!biba_dominate_effective(obj, subj)) 1770 return (EACCES); 1771 break; 1772 1773 default: 1774 return (EACCES); 1775 } 1776 1777 return (0); 1778} 1779 1780static int 1781biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 1782 struct label *semaklabel) 1783{ 1784 struct mac_biba *subj, *obj; 1785 1786 if (!biba_enabled) 1787 return (0); 1788 1789 subj = SLOT(cred->cr_label); 1790 obj = SLOT(semaklabel); 1791 1792 if (!biba_dominate_effective(obj, subj)) 1793 return (EACCES); 1794 1795 return (0); 1796} 1797 1798static int 1799biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 1800 struct label *semaklabel, size_t accesstype) 1801{ 1802 struct mac_biba *subj, *obj; 1803 1804 if (!biba_enabled) 1805 return (0); 1806 1807 subj = SLOT(cred->cr_label); 1808 obj = SLOT(semaklabel); 1809 1810 if (accesstype & SEM_R) 1811 if (!biba_dominate_effective(obj, subj)) 1812 return (EACCES); 1813 1814 if (accesstype & SEM_A) 1815 if (!biba_dominate_effective(subj, obj)) 1816 return (EACCES); 1817 1818 return (0); 1819} 1820 1821static int 1822biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 1823 struct label *shmseglabel, int shmflg) 1824{ 1825 struct mac_biba *subj, *obj; 1826 1827 if (!biba_enabled) 1828 return (0); 1829 1830 subj = SLOT(cred->cr_label); 1831 obj = SLOT(shmseglabel); 1832 1833 if (!biba_dominate_effective(obj, subj)) 1834 return (EACCES); 1835 if ((shmflg & SHM_RDONLY) == 0) { 1836 if (!biba_dominate_effective(subj, obj)) 1837 return (EACCES); 1838 } 1839 1840 return (0); 1841} 1842 1843static int 1844biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 1845 struct label *shmseglabel, int cmd) 1846{ 1847 struct mac_biba *subj, *obj; 1848 1849 if (!biba_enabled) 1850 return (0); 1851 1852 subj = SLOT(cred->cr_label); 1853 obj = SLOT(shmseglabel); 1854 1855 switch(cmd) { 1856 case IPC_RMID: 1857 case IPC_SET: 1858 if (!biba_dominate_effective(subj, obj)) 1859 return (EACCES); 1860 break; 1861 1862 case IPC_STAT: 1863 case SHM_STAT: 1864 if (!biba_dominate_effective(obj, subj)) 1865 return (EACCES); 1866 break; 1867 1868 default: 1869 return (EACCES); 1870 } 1871 1872 return (0); 1873} 1874 1875static int 1876biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 1877 struct label *shmseglabel, int shmflg) 1878{ 1879 struct mac_biba *subj, *obj; 1880 1881 if (!biba_enabled) 1882 return (0); 1883 1884 subj = SLOT(cred->cr_label); 1885 obj = SLOT(shmseglabel); 1886 1887 if (!biba_dominate_effective(obj, subj)) 1888 return (EACCES); 1889 1890 return (0); 1891} 1892 1893static int 1894biba_kld_check_load(struct ucred *cred, struct vnode *vp, 1895 struct label *vplabel) 1896{ 1897 struct mac_biba *subj, *obj; 1898 int error; 1899 1900 if (!biba_enabled) 1901 return (0); 1902 1903 subj = SLOT(cred->cr_label); 1904 1905 error = biba_subject_privileged(subj); 1906 if (error) 1907 return (error); 1908 1909 obj = SLOT(vplabel); 1910 if (!biba_high_effective(obj)) 1911 return (EACCES); 1912 1913 return (0); 1914} 1915 1916static int 1917biba_mount_check_stat(struct ucred *cred, struct mount *mp, 1918 struct label *mplabel) 1919{ 1920 struct mac_biba *subj, *obj; 1921 1922 if (!biba_enabled) 1923 return (0); 1924 1925 subj = SLOT(cred->cr_label); 1926 obj = SLOT(mplabel); 1927 1928 if (!biba_dominate_effective(obj, subj)) 1929 return (EACCES); 1930 1931 return (0); 1932} 1933 1934static int 1935biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1936 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1937{ 1938 1939 if(!biba_enabled) 1940 return (0); 1941 1942 /* XXX: This will be implemented soon... */ 1943 1944 return (0); 1945} 1946 1947static int 1948biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1949 struct label *pplabel) 1950{ 1951 struct mac_biba *subj, *obj; 1952 1953 if (!biba_enabled) 1954 return (0); 1955 1956 subj = SLOT(cred->cr_label); 1957 obj = SLOT(pplabel); 1958 1959 if (!biba_dominate_effective(obj, subj)) 1960 return (EACCES); 1961 1962 return (0); 1963} 1964 1965static int 1966biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1967 struct label *pplabel) 1968{ 1969 struct mac_biba *subj, *obj; 1970 1971 if (!biba_enabled) 1972 return (0); 1973 1974 subj = SLOT(cred->cr_label); 1975 obj = SLOT(pplabel); 1976 1977 if (!biba_dominate_effective(obj, subj)) 1978 return (EACCES); 1979 1980 return (0); 1981} 1982 1983static int 1984biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1985 struct label *pplabel, struct label *newlabel) 1986{ 1987 struct mac_biba *subj, *obj, *new; 1988 int error; 1989 1990 new = SLOT(newlabel); 1991 subj = SLOT(cred->cr_label); 1992 obj = SLOT(pplabel); 1993 1994 /* 1995 * If there is a Biba label update for a pipe, it must be a effective 1996 * update. 1997 */ 1998 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1999 if (error) 2000 return (error); 2001 2002 /* 2003 * To perform a relabel of a pipe (Biba label or not), Biba must 2004 * authorize the relabel. 2005 */ 2006 if (!biba_effective_in_range(obj, subj)) 2007 return (EPERM); 2008 2009 /* 2010 * If the Biba label is to be changed, authorize as appropriate. 2011 */ 2012 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2013 /* 2014 * To change the Biba label on a pipe, the new pipe label 2015 * must be in the subject range. 2016 */ 2017 if (!biba_effective_in_range(new, subj)) 2018 return (EPERM); 2019 2020 /* 2021 * To change the Biba label on a pipe to be EQUAL, the 2022 * subject must have appropriate privilege. 2023 */ 2024 if (biba_contains_equal(new)) { 2025 error = biba_subject_privileged(subj); 2026 if (error) 2027 return (error); 2028 } 2029 } 2030 2031 return (0); 2032} 2033 2034static int 2035biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 2036 struct label *pplabel) 2037{ 2038 struct mac_biba *subj, *obj; 2039 2040 if (!biba_enabled) 2041 return (0); 2042 2043 subj = SLOT(cred->cr_label); 2044 obj = SLOT(pplabel); 2045 2046 if (!biba_dominate_effective(obj, subj)) 2047 return (EACCES); 2048 2049 return (0); 2050} 2051 2052static int 2053biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, 2054 struct label *pplabel) 2055{ 2056 struct mac_biba *subj, *obj; 2057 2058 if (!biba_enabled) 2059 return (0); 2060 2061 subj = SLOT(cred->cr_label); 2062 obj = SLOT(pplabel); 2063 2064 if (!biba_dominate_effective(subj, obj)) 2065 return (EACCES); 2066 2067 return (0); 2068} 2069 2070static int 2071biba_posixsem_check_write(struct ucred *cred, struct ksem *ks, 2072 struct label *kslabel) 2073{ 2074 struct mac_biba *subj, *obj; 2075 2076 if (!biba_enabled) 2077 return (0); 2078 2079 subj = SLOT(cred->cr_label); 2080 obj = SLOT(kslabel); 2081 2082 if (!biba_dominate_effective(subj, obj)) 2083 return (EACCES); 2084 2085 return (0); 2086} 2087 2088static int 2089biba_posixsem_check_rdonly(struct ucred *cred, struct ksem *ks, 2090 struct label *kslabel) 2091{ 2092 struct mac_biba *subj, *obj; 2093 2094 if (!biba_enabled) 2095 return (0); 2096 2097 subj = SLOT(cred->cr_label); 2098 obj = SLOT(kslabel); 2099 2100 if (!biba_dominate_effective(obj, subj)) 2101 return (EACCES); 2102 2103 return (0); 2104} 2105 2106static int 2107biba_proc_check_debug(struct ucred *cred, struct proc *p) 2108{ 2109 struct mac_biba *subj, *obj; 2110 2111 if (!biba_enabled) 2112 return (0); 2113 2114 subj = SLOT(cred->cr_label); 2115 obj = SLOT(p->p_ucred->cr_label); 2116 2117 /* XXX: range checks */ 2118 if (!biba_dominate_effective(obj, subj)) 2119 return (ESRCH); 2120 if (!biba_dominate_effective(subj, obj)) 2121 return (EACCES); 2122 2123 return (0); 2124} 2125 2126static int 2127biba_proc_check_sched(struct ucred *cred, struct proc *p) 2128{ 2129 struct mac_biba *subj, *obj; 2130 2131 if (!biba_enabled) 2132 return (0); 2133 2134 subj = SLOT(cred->cr_label); 2135 obj = SLOT(p->p_ucred->cr_label); 2136 2137 /* XXX: range checks */ 2138 if (!biba_dominate_effective(obj, subj)) 2139 return (ESRCH); 2140 if (!biba_dominate_effective(subj, obj)) 2141 return (EACCES); 2142 2143 return (0); 2144} 2145 2146static int 2147biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 2148{ 2149 struct mac_biba *subj, *obj; 2150 2151 if (!biba_enabled) 2152 return (0); 2153 2154 subj = SLOT(cred->cr_label); 2155 obj = SLOT(p->p_ucred->cr_label); 2156 2157 /* XXX: range checks */ 2158 if (!biba_dominate_effective(obj, subj)) 2159 return (ESRCH); 2160 if (!biba_dominate_effective(subj, obj)) 2161 return (EACCES); 2162 2163 return (0); 2164} 2165 2166static int 2167biba_socket_check_deliver(struct socket *so, struct label *solabel, 2168 struct mbuf *m, struct label *mlabel) 2169{ 2170 struct mac_biba *p, *s; 2171 2172 if (!biba_enabled) 2173 return (0); 2174 2175 p = SLOT(mlabel); 2176 s = SLOT(solabel); 2177 2178 return (biba_equal_effective(p, s) ? 0 : EACCES); 2179} 2180 2181static int 2182biba_socket_check_relabel(struct ucred *cred, struct socket *so, 2183 struct label *solabel, struct label *newlabel) 2184{ 2185 struct mac_biba *subj, *obj, *new; 2186 int error; 2187 2188 new = SLOT(newlabel); 2189 subj = SLOT(cred->cr_label); 2190 obj = SLOT(solabel); 2191 2192 /* 2193 * If there is a Biba label update for the socket, it may be an 2194 * update of effective. 2195 */ 2196 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2197 if (error) 2198 return (error); 2199 2200 /* 2201 * To relabel a socket, the old socket effective must be in the 2202 * subject range. 2203 */ 2204 if (!biba_effective_in_range(obj, subj)) 2205 return (EPERM); 2206 2207 /* 2208 * If the Biba label is to be changed, authorize as appropriate. 2209 */ 2210 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2211 /* 2212 * To relabel a socket, the new socket effective must be in 2213 * the subject range. 2214 */ 2215 if (!biba_effective_in_range(new, subj)) 2216 return (EPERM); 2217 2218 /* 2219 * To change the Biba label on the socket to contain EQUAL, 2220 * the subject must have appropriate privilege. 2221 */ 2222 if (biba_contains_equal(new)) { 2223 error = biba_subject_privileged(subj); 2224 if (error) 2225 return (error); 2226 } 2227 } 2228 2229 return (0); 2230} 2231 2232static int 2233biba_socket_check_visible(struct ucred *cred, struct socket *so, 2234 struct label *solabel) 2235{ 2236 struct mac_biba *subj, *obj; 2237 2238 if (!biba_enabled) 2239 return (0); 2240 2241 subj = SLOT(cred->cr_label); 2242 obj = SLOT(solabel); 2243 2244 if (!biba_dominate_effective(obj, subj)) 2245 return (ENOENT); 2246 2247 return (0); 2248} 2249 2250/* 2251 * Some system privileges are allowed regardless of integrity grade; others 2252 * are allowed only when running with privilege with respect to the Biba 2253 * policy as they might otherwise allow bypassing of the integrity policy. 2254 */ 2255static int 2256biba_priv_check(struct ucred *cred, int priv) 2257{ 2258 struct mac_biba *subj; 2259 int error; 2260 2261 if (!biba_enabled) 2262 return (0); 2263 2264 /* 2265 * Exempt only specific privileges from the Biba integrity policy. 2266 */ 2267 switch (priv) { 2268 case PRIV_KTRACE: 2269 case PRIV_MSGBUF: 2270 2271 /* 2272 * Allow processes to manipulate basic process audit properties, and 2273 * to submit audit records. 2274 */ 2275 case PRIV_AUDIT_GETAUDIT: 2276 case PRIV_AUDIT_SETAUDIT: 2277 case PRIV_AUDIT_SUBMIT: 2278 2279 /* 2280 * Allow processes to manipulate their regular UNIX credentials. 2281 */ 2282 case PRIV_CRED_SETUID: 2283 case PRIV_CRED_SETEUID: 2284 case PRIV_CRED_SETGID: 2285 case PRIV_CRED_SETEGID: 2286 case PRIV_CRED_SETGROUPS: 2287 case PRIV_CRED_SETREUID: 2288 case PRIV_CRED_SETREGID: 2289 case PRIV_CRED_SETRESUID: 2290 case PRIV_CRED_SETRESGID: 2291 2292 /* 2293 * Allow processes to perform system monitoring. 2294 */ 2295 case PRIV_SEEOTHERGIDS: 2296 case PRIV_SEEOTHERUIDS: 2297 break; 2298 2299 /* 2300 * Allow access to general process debugging facilities. We 2301 * separately control debugging based on MAC label. 2302 */ 2303 case PRIV_DEBUG_DIFFCRED: 2304 case PRIV_DEBUG_SUGID: 2305 case PRIV_DEBUG_UNPRIV: 2306 2307 /* 2308 * Allow manipulating jails. 2309 */ 2310 case PRIV_JAIL_ATTACH: 2311 2312 /* 2313 * Allow privilege with respect to the Partition policy, but not the 2314 * Privs policy. 2315 */ 2316 case PRIV_MAC_PARTITION: 2317 2318 /* 2319 * Allow privilege with respect to process resource limits and login 2320 * context. 2321 */ 2322 case PRIV_PROC_LIMIT: 2323 case PRIV_PROC_SETLOGIN: 2324 case PRIV_PROC_SETRLIMIT: 2325 2326 /* 2327 * Allow System V and POSIX IPC privileges. 2328 */ 2329 case PRIV_IPC_READ: 2330 case PRIV_IPC_WRITE: 2331 case PRIV_IPC_ADMIN: 2332 case PRIV_IPC_MSGSIZE: 2333 case PRIV_MQ_ADMIN: 2334 2335 /* 2336 * Allow certain scheduler manipulations -- possibly this should be 2337 * controlled by more fine-grained policy, as potentially low 2338 * integrity processes can deny CPU to higher integrity ones. 2339 */ 2340 case PRIV_SCHED_DIFFCRED: 2341 case PRIV_SCHED_SETPRIORITY: 2342 case PRIV_SCHED_RTPRIO: 2343 case PRIV_SCHED_SETPOLICY: 2344 case PRIV_SCHED_SET: 2345 case PRIV_SCHED_SETPARAM: 2346 2347 /* 2348 * More IPC privileges. 2349 */ 2350 case PRIV_SEM_WRITE: 2351 2352 /* 2353 * Allow signaling privileges subject to integrity policy. 2354 */ 2355 case PRIV_SIGNAL_DIFFCRED: 2356 case PRIV_SIGNAL_SUGID: 2357 2358 /* 2359 * Allow access to only limited sysctls from lower integrity levels; 2360 * piggy-back on the Jail definition. 2361 */ 2362 case PRIV_SYSCTL_WRITEJAIL: 2363 2364 /* 2365 * Allow TTY-based privileges, subject to general device access using 2366 * labels on TTY device nodes, but not console privilege. 2367 */ 2368 case PRIV_TTY_DRAINWAIT: 2369 case PRIV_TTY_DTRWAIT: 2370 case PRIV_TTY_EXCLUSIVE: 2371 case PRIV_TTY_PRISON: 2372 case PRIV_TTY_STI: 2373 case PRIV_TTY_SETA: 2374 2375 /* 2376 * Grant most VFS privileges, as almost all are in practice bounded 2377 * by more specific checks using labels. 2378 */ 2379 case PRIV_VFS_READ: 2380 case PRIV_VFS_WRITE: 2381 case PRIV_VFS_ADMIN: 2382 case PRIV_VFS_EXEC: 2383 case PRIV_VFS_LOOKUP: 2384 case PRIV_VFS_CHFLAGS_DEV: 2385 case PRIV_VFS_CHOWN: 2386 case PRIV_VFS_CHROOT: 2387 case PRIV_VFS_RETAINSUGID: 2388 case PRIV_VFS_EXCEEDQUOTA: 2389 case PRIV_VFS_FCHROOT: 2390 case PRIV_VFS_FHOPEN: 2391 case PRIV_VFS_FHSTATFS: 2392 case PRIV_VFS_GENERATION: 2393 case PRIV_VFS_GETFH: 2394 case PRIV_VFS_GETQUOTA: 2395 case PRIV_VFS_LINK: 2396 case PRIV_VFS_MOUNT: 2397 case PRIV_VFS_MOUNT_OWNER: 2398 case PRIV_VFS_MOUNT_PERM: 2399 case PRIV_VFS_MOUNT_SUIDDIR: 2400 case PRIV_VFS_MOUNT_NONUSER: 2401 case PRIV_VFS_SETGID: 2402 case PRIV_VFS_STICKYFILE: 2403 case PRIV_VFS_SYSFLAGS: 2404 case PRIV_VFS_UNMOUNT: 2405 2406 /* 2407 * Allow VM privileges; it would be nice if these were subject to 2408 * resource limits. 2409 */ 2410 case PRIV_VM_MADV_PROTECT: 2411 case PRIV_VM_MLOCK: 2412 case PRIV_VM_MUNLOCK: 2413 2414 /* 2415 * Allow some but not all network privileges. In general, dont allow 2416 * reconfiguring the network stack, just normal use. 2417 */ 2418 case PRIV_NETATALK_RESERVEDPORT: 2419 case PRIV_NETINET_RESERVEDPORT: 2420 case PRIV_NETINET_RAW: 2421 case PRIV_NETINET_REUSEPORT: 2422 case PRIV_NETIPX_RESERVEDPORT: 2423 case PRIV_NETIPX_RAW: 2424 break; 2425 2426 /* 2427 * All remaining system privileges are allow only if the process 2428 * holds privilege with respect to the Biba policy. 2429 */ 2430 default: 2431 subj = SLOT(cred->cr_label); 2432 error = biba_subject_privileged(subj); 2433 if (error) 2434 return (error); 2435 } 2436 return (0); 2437} 2438 2439static int 2440biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2441 struct label *vplabel) 2442{ 2443 struct mac_biba *subj, *obj; 2444 int error; 2445 2446 if (!biba_enabled) 2447 return (0); 2448 2449 subj = SLOT(cred->cr_label); 2450 2451 error = biba_subject_privileged(subj); 2452 if (error) 2453 return (error); 2454 2455 if (vplabel == NULL) 2456 return (0); 2457 2458 obj = SLOT(vplabel); 2459 if (!biba_high_effective(obj)) 2460 return (EACCES); 2461 2462 return (0); 2463} 2464 2465static int 2466biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2467 struct label *vplabel) 2468{ 2469 struct mac_biba *subj, *obj; 2470 int error; 2471 2472 if (!biba_enabled) 2473 return (0); 2474 2475 subj = SLOT(cred->cr_label); 2476 2477 error = biba_subject_privileged(subj); 2478 if (error) 2479 return (error); 2480 2481 if (vplabel == NULL) 2482 return (0); 2483 2484 obj = SLOT(vplabel); 2485 if (!biba_high_effective(obj)) 2486 return (EACCES); 2487 2488 return (0); 2489} 2490 2491static int 2492biba_system_check_auditon(struct ucred *cred, int cmd) 2493{ 2494 struct mac_biba *subj; 2495 int error; 2496 2497 if (!biba_enabled) 2498 return (0); 2499 2500 subj = SLOT(cred->cr_label); 2501 2502 error = biba_subject_privileged(subj); 2503 if (error) 2504 return (error); 2505 2506 return (0); 2507} 2508 2509static int 2510biba_system_check_swapon(struct ucred *cred, struct vnode *vp, 2511 struct label *vplabel) 2512{ 2513 struct mac_biba *subj, *obj; 2514 int error; 2515 2516 if (!biba_enabled) 2517 return (0); 2518 2519 subj = SLOT(cred->cr_label); 2520 obj = SLOT(vplabel); 2521 2522 error = biba_subject_privileged(subj); 2523 if (error) 2524 return (error); 2525 2526 if (!biba_high_effective(obj)) 2527 return (EACCES); 2528 2529 return (0); 2530} 2531 2532static int 2533biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2534 struct label *label) 2535{ 2536 struct mac_biba *subj; 2537 int error; 2538 2539 if (!biba_enabled) 2540 return (0); 2541 2542 subj = SLOT(cred->cr_label); 2543 2544 error = biba_subject_privileged(subj); 2545 if (error) 2546 return (error); 2547 2548 return (0); 2549} 2550 2551static int 2552biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2553 void *arg1, int arg2, struct sysctl_req *req) 2554{ 2555 struct mac_biba *subj; 2556 int error; 2557 2558 if (!biba_enabled) 2559 return (0); 2560 2561 subj = SLOT(cred->cr_label); 2562 2563 /* 2564 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2565 * but also require privilege to change them. 2566 */ 2567 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2568 if (!biba_subject_dominate_high(subj)) 2569 return (EACCES); 2570 2571 error = biba_subject_privileged(subj); 2572 if (error) 2573 return (error); 2574 } 2575 2576 return (0); 2577} 2578 2579static int 2580biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2581 struct label *dvplabel) 2582{ 2583 struct mac_biba *subj, *obj; 2584 2585 if (!biba_enabled) 2586 return (0); 2587 2588 subj = SLOT(cred->cr_label); 2589 obj = SLOT(dvplabel); 2590 2591 if (!biba_dominate_effective(obj, subj)) 2592 return (EACCES); 2593 2594 return (0); 2595} 2596 2597static int 2598biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2599 struct label *dvplabel) 2600{ 2601 struct mac_biba *subj, *obj; 2602 2603 if (!biba_enabled) 2604 return (0); 2605 2606 subj = SLOT(cred->cr_label); 2607 obj = SLOT(dvplabel); 2608 2609 if (!biba_dominate_effective(obj, subj)) 2610 return (EACCES); 2611 2612 return (0); 2613} 2614 2615static int 2616biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2617 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2618{ 2619 struct mac_biba *subj, *obj; 2620 2621 if (!biba_enabled) 2622 return (0); 2623 2624 subj = SLOT(cred->cr_label); 2625 obj = SLOT(dvplabel); 2626 2627 if (!biba_dominate_effective(subj, obj)) 2628 return (EACCES); 2629 2630 return (0); 2631} 2632 2633static int 2634biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2635 struct label *vplabel, acl_type_t type) 2636{ 2637 struct mac_biba *subj, *obj; 2638 2639 if (!biba_enabled) 2640 return (0); 2641 2642 subj = SLOT(cred->cr_label); 2643 obj = SLOT(vplabel); 2644 2645 if (!biba_dominate_effective(subj, obj)) 2646 return (EACCES); 2647 2648 return (0); 2649} 2650 2651static int 2652biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2653 struct label *vplabel, int attrnamespace, const char *name) 2654{ 2655 struct mac_biba *subj, *obj; 2656 2657 if (!biba_enabled) 2658 return (0); 2659 2660 subj = SLOT(cred->cr_label); 2661 obj = SLOT(vplabel); 2662 2663 if (!biba_dominate_effective(subj, obj)) 2664 return (EACCES); 2665 2666 return (0); 2667} 2668 2669static int 2670biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2671 struct label *vplabel, struct image_params *imgp, 2672 struct label *execlabel) 2673{ 2674 struct mac_biba *subj, *obj, *exec; 2675 int error; 2676 2677 if (execlabel != NULL) { 2678 /* 2679 * We currently don't permit labels to be changed at 2680 * exec-time as part of Biba, so disallow non-NULL Biba label 2681 * elements in the execlabel. 2682 */ 2683 exec = SLOT(execlabel); 2684 error = biba_atmostflags(exec, 0); 2685 if (error) 2686 return (error); 2687 } 2688 2689 if (!biba_enabled) 2690 return (0); 2691 2692 subj = SLOT(cred->cr_label); 2693 obj = SLOT(vplabel); 2694 2695 if (!biba_dominate_effective(obj, subj)) 2696 return (EACCES); 2697 2698 return (0); 2699} 2700 2701static int 2702biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2703 struct label *vplabel, acl_type_t type) 2704{ 2705 struct mac_biba *subj, *obj; 2706 2707 if (!biba_enabled) 2708 return (0); 2709 2710 subj = SLOT(cred->cr_label); 2711 obj = SLOT(vplabel); 2712 2713 if (!biba_dominate_effective(obj, subj)) 2714 return (EACCES); 2715 2716 return (0); 2717} 2718 2719static int 2720biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2721 struct label *vplabel, int attrnamespace, const char *name, 2722 struct uio *uio) 2723{ 2724 struct mac_biba *subj, *obj; 2725 2726 if (!biba_enabled) 2727 return (0); 2728 2729 subj = SLOT(cred->cr_label); 2730 obj = SLOT(vplabel); 2731 2732 if (!biba_dominate_effective(obj, subj)) 2733 return (EACCES); 2734 2735 return (0); 2736} 2737 2738static int 2739biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2740 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2741 struct componentname *cnp) 2742{ 2743 struct mac_biba *subj, *obj; 2744 2745 if (!biba_enabled) 2746 return (0); 2747 2748 subj = SLOT(cred->cr_label); 2749 obj = SLOT(dvplabel); 2750 2751 if (!biba_dominate_effective(subj, obj)) 2752 return (EACCES); 2753 2754 obj = SLOT(vplabel); 2755 2756 if (!biba_dominate_effective(subj, obj)) 2757 return (EACCES); 2758 2759 return (0); 2760} 2761 2762static int 2763biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2764 struct label *vplabel, int attrnamespace) 2765{ 2766 struct mac_biba *subj, *obj; 2767 2768 if (!biba_enabled) 2769 return (0); 2770 2771 subj = SLOT(cred->cr_label); 2772 obj = SLOT(vplabel); 2773 2774 if (!biba_dominate_effective(obj, subj)) 2775 return (EACCES); 2776 2777 return (0); 2778} 2779 2780static int 2781biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2782 struct label *dvplabel, struct componentname *cnp) 2783{ 2784 struct mac_biba *subj, *obj; 2785 2786 if (!biba_enabled) 2787 return (0); 2788 2789 subj = SLOT(cred->cr_label); 2790 obj = SLOT(dvplabel); 2791 2792 if (!biba_dominate_effective(obj, subj)) 2793 return (EACCES); 2794 2795 return (0); 2796} 2797 2798static int 2799biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2800 struct label *vplabel, int prot, int flags) 2801{ 2802 struct mac_biba *subj, *obj; 2803 2804 /* 2805 * Rely on the use of open()-time protections to handle 2806 * non-revocation cases. 2807 */ 2808 if (!biba_enabled || !revocation_enabled) 2809 return (0); 2810 2811 subj = SLOT(cred->cr_label); 2812 obj = SLOT(vplabel); 2813 2814 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2815 if (!biba_dominate_effective(obj, subj)) 2816 return (EACCES); 2817 } 2818 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2819 if (!biba_dominate_effective(subj, obj)) 2820 return (EACCES); 2821 } 2822 2823 return (0); 2824} 2825 2826static int 2827biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2828 struct label *vplabel, int acc_mode) 2829{ 2830 struct mac_biba *subj, *obj; 2831 2832 if (!biba_enabled) 2833 return (0); 2834 2835 subj = SLOT(cred->cr_label); 2836 obj = SLOT(vplabel); 2837 2838 /* XXX privilege override for admin? */ 2839 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2840 if (!biba_dominate_effective(obj, subj)) 2841 return (EACCES); 2842 } 2843 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2844 if (!biba_dominate_effective(subj, obj)) 2845 return (EACCES); 2846 } 2847 2848 return (0); 2849} 2850 2851static int 2852biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2853 struct vnode *vp, struct label *vplabel) 2854{ 2855 struct mac_biba *subj, *obj; 2856 2857 if (!biba_enabled || !revocation_enabled) 2858 return (0); 2859 2860 subj = SLOT(active_cred->cr_label); 2861 obj = SLOT(vplabel); 2862 2863 if (!biba_dominate_effective(obj, subj)) 2864 return (EACCES); 2865 2866 return (0); 2867} 2868 2869static int 2870biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2871 struct vnode *vp, struct label *vplabel) 2872{ 2873 struct mac_biba *subj, *obj; 2874 2875 if (!biba_enabled || !revocation_enabled) 2876 return (0); 2877 2878 subj = SLOT(active_cred->cr_label); 2879 obj = SLOT(vplabel); 2880 2881 if (!biba_dominate_effective(obj, subj)) 2882 return (EACCES); 2883 2884 return (0); 2885} 2886 2887static int 2888biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2889 struct label *dvplabel) 2890{ 2891 struct mac_biba *subj, *obj; 2892 2893 if (!biba_enabled) 2894 return (0); 2895 2896 subj = SLOT(cred->cr_label); 2897 obj = SLOT(dvplabel); 2898 2899 if (!biba_dominate_effective(obj, subj)) 2900 return (EACCES); 2901 2902 return (0); 2903} 2904 2905static int 2906biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2907 struct label *vplabel) 2908{ 2909 struct mac_biba *subj, *obj; 2910 2911 if (!biba_enabled) 2912 return (0); 2913 2914 subj = SLOT(cred->cr_label); 2915 obj = SLOT(vplabel); 2916 2917 if (!biba_dominate_effective(obj, subj)) 2918 return (EACCES); 2919 2920 return (0); 2921} 2922 2923static int 2924biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2925 struct label *vplabel, struct label *newlabel) 2926{ 2927 struct mac_biba *old, *new, *subj; 2928 int error; 2929 2930 old = SLOT(vplabel); 2931 new = SLOT(newlabel); 2932 subj = SLOT(cred->cr_label); 2933 2934 /* 2935 * If there is a Biba label update for the vnode, it must be a 2936 * effective label. 2937 */ 2938 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2939 if (error) 2940 return (error); 2941 2942 /* 2943 * To perform a relabel of the vnode (Biba label or not), Biba must 2944 * authorize the relabel. 2945 */ 2946 if (!biba_effective_in_range(old, subj)) 2947 return (EPERM); 2948 2949 /* 2950 * If the Biba label is to be changed, authorize as appropriate. 2951 */ 2952 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2953 /* 2954 * To change the Biba label on a vnode, the new vnode label 2955 * must be in the subject range. 2956 */ 2957 if (!biba_effective_in_range(new, subj)) 2958 return (EPERM); 2959 2960 /* 2961 * To change the Biba label on the vnode to be EQUAL, the 2962 * subject must have appropriate privilege. 2963 */ 2964 if (biba_contains_equal(new)) { 2965 error = biba_subject_privileged(subj); 2966 if (error) 2967 return (error); 2968 } 2969 } 2970 2971 return (0); 2972} 2973 2974static int 2975biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 2976 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2977 struct componentname *cnp) 2978{ 2979 struct mac_biba *subj, *obj; 2980 2981 if (!biba_enabled) 2982 return (0); 2983 2984 subj = SLOT(cred->cr_label); 2985 obj = SLOT(dvplabel); 2986 2987 if (!biba_dominate_effective(subj, obj)) 2988 return (EACCES); 2989 2990 obj = SLOT(vplabel); 2991 2992 if (!biba_dominate_effective(subj, obj)) 2993 return (EACCES); 2994 2995 return (0); 2996} 2997 2998static int 2999biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 3000 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3001 int samedir, struct componentname *cnp) 3002{ 3003 struct mac_biba *subj, *obj; 3004 3005 if (!biba_enabled) 3006 return (0); 3007 3008 subj = SLOT(cred->cr_label); 3009 obj = SLOT(dvplabel); 3010 3011 if (!biba_dominate_effective(subj, obj)) 3012 return (EACCES); 3013 3014 if (vp != NULL) { 3015 obj = SLOT(vplabel); 3016 3017 if (!biba_dominate_effective(subj, obj)) 3018 return (EACCES); 3019 } 3020 3021 return (0); 3022} 3023 3024static int 3025biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3026 struct label *vplabel) 3027{ 3028 struct mac_biba *subj, *obj; 3029 3030 if (!biba_enabled) 3031 return (0); 3032 3033 subj = SLOT(cred->cr_label); 3034 obj = SLOT(vplabel); 3035 3036 if (!biba_dominate_effective(subj, obj)) 3037 return (EACCES); 3038 3039 return (0); 3040} 3041 3042static int 3043biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 3044 struct label *vplabel, acl_type_t type, struct acl *acl) 3045{ 3046 struct mac_biba *subj, *obj; 3047 3048 if (!biba_enabled) 3049 return (0); 3050 3051 subj = SLOT(cred->cr_label); 3052 obj = SLOT(vplabel); 3053 3054 if (!biba_dominate_effective(subj, obj)) 3055 return (EACCES); 3056 3057 return (0); 3058} 3059 3060static int 3061biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3062 struct label *vplabel, int attrnamespace, const char *name, 3063 struct uio *uio) 3064{ 3065 struct mac_biba *subj, *obj; 3066 3067 if (!biba_enabled) 3068 return (0); 3069 3070 subj = SLOT(cred->cr_label); 3071 obj = SLOT(vplabel); 3072 3073 if (!biba_dominate_effective(subj, obj)) 3074 return (EACCES); 3075 3076 /* XXX: protect the MAC EA in a special way? */ 3077 3078 return (0); 3079} 3080 3081static int 3082biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3083 struct label *vplabel, u_long flags) 3084{ 3085 struct mac_biba *subj, *obj; 3086 3087 if (!biba_enabled) 3088 return (0); 3089 3090 subj = SLOT(cred->cr_label); 3091 obj = SLOT(vplabel); 3092 3093 if (!biba_dominate_effective(subj, obj)) 3094 return (EACCES); 3095 3096 return (0); 3097} 3098 3099static int 3100biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3101 struct label *vplabel, mode_t mode) 3102{ 3103 struct mac_biba *subj, *obj; 3104 3105 if (!biba_enabled) 3106 return (0); 3107 3108 subj = SLOT(cred->cr_label); 3109 obj = SLOT(vplabel); 3110 3111 if (!biba_dominate_effective(subj, obj)) 3112 return (EACCES); 3113 3114 return (0); 3115} 3116 3117static int 3118biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3119 struct label *vplabel, uid_t uid, gid_t gid) 3120{ 3121 struct mac_biba *subj, *obj; 3122 3123 if (!biba_enabled) 3124 return (0); 3125 3126 subj = SLOT(cred->cr_label); 3127 obj = SLOT(vplabel); 3128 3129 if (!biba_dominate_effective(subj, obj)) 3130 return (EACCES); 3131 3132 return (0); 3133} 3134 3135static int 3136biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3137 struct label *vplabel, struct timespec atime, struct timespec mtime) 3138{ 3139 struct mac_biba *subj, *obj; 3140 3141 if (!biba_enabled) 3142 return (0); 3143 3144 subj = SLOT(cred->cr_label); 3145 obj = SLOT(vplabel); 3146 3147 if (!biba_dominate_effective(subj, obj)) 3148 return (EACCES); 3149 3150 return (0); 3151} 3152 3153static int 3154biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3155 struct vnode *vp, struct label *vplabel) 3156{ 3157 struct mac_biba *subj, *obj; 3158 3159 if (!biba_enabled) 3160 return (0); 3161 3162 subj = SLOT(active_cred->cr_label); 3163 obj = SLOT(vplabel); 3164 3165 if (!biba_dominate_effective(obj, subj)) 3166 return (EACCES); 3167 3168 return (0); 3169} 3170 3171static int 3172biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3173 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3174 struct componentname *cnp) 3175{ 3176 struct mac_biba *subj, *obj; 3177 3178 if (!biba_enabled) 3179 return (0); 3180 3181 subj = SLOT(cred->cr_label); 3182 obj = SLOT(dvplabel); 3183 3184 if (!biba_dominate_effective(subj, obj)) 3185 return (EACCES); 3186 3187 obj = SLOT(vplabel); 3188 3189 if (!biba_dominate_effective(subj, obj)) 3190 return (EACCES); 3191 3192 return (0); 3193} 3194 3195static int 3196biba_vnode_check_write(struct ucred *active_cred, 3197 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3198{ 3199 struct mac_biba *subj, *obj; 3200 3201 if (!biba_enabled || !revocation_enabled) 3202 return (0); 3203 3204 subj = SLOT(active_cred->cr_label); 3205 obj = SLOT(vplabel); 3206 3207 if (!biba_dominate_effective(subj, obj)) 3208 return (EACCES); 3209 3210 return (0); 3211} 3212 3213static void 3214biba_syncache_create(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_syncache_create_mbuf(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_syncache_init_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_syncache_create = biba_syncache_create, 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_syncache_destroy_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_syncache_create_mbuf = biba_syncache_create_mbuf, 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_mbuf_create_linklayer = biba_mbuf_create_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_proc_associate_nfsd = biba_proc_associate_nfsd, 3335 .mpo_cred_relabel = biba_cred_relabel, 3336 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3337 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3338 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3339 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3340 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3341 .mpo_cred_check_relabel = biba_cred_check_relabel, 3342 .mpo_cred_check_visible = biba_cred_check_visible, 3343 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3344 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3345 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3346 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3347 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3348 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3349 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3350 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3351 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3352 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3353 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3354 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3355 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3356 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3357 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3358 .mpo_kld_check_load = biba_kld_check_load, 3359 .mpo_mount_check_stat = biba_mount_check_stat, 3360 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3361 .mpo_pipe_check_poll = biba_pipe_check_poll, 3362 .mpo_pipe_check_read = biba_pipe_check_read, 3363 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3364 .mpo_pipe_check_stat = biba_pipe_check_stat, 3365 .mpo_pipe_check_write = biba_pipe_check_write, 3366 .mpo_posixsem_check_destroy = biba_posixsem_check_write, 3367 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3368 .mpo_posixsem_check_open = biba_posixsem_check_write, 3369 .mpo_posixsem_check_post = biba_posixsem_check_write, 3370 .mpo_posixsem_check_unlink = biba_posixsem_check_write, 3371 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3372 .mpo_proc_check_debug = biba_proc_check_debug, 3373 .mpo_proc_check_sched = biba_proc_check_sched, 3374 .mpo_proc_check_signal = biba_proc_check_signal, 3375 .mpo_socket_check_deliver = biba_socket_check_deliver, 3376 .mpo_socket_check_relabel = biba_socket_check_relabel, 3377 .mpo_socket_check_visible = biba_socket_check_visible, 3378 .mpo_system_check_acct = biba_system_check_acct, 3379 .mpo_system_check_auditctl = biba_system_check_auditctl, 3380 .mpo_system_check_auditon = biba_system_check_auditon, 3381 .mpo_system_check_swapon = biba_system_check_swapon, 3382 .mpo_system_check_swapoff = biba_system_check_swapoff, 3383 .mpo_system_check_sysctl = biba_system_check_sysctl, 3384 .mpo_vnode_check_access = biba_vnode_check_open, 3385 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3386 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3387 .mpo_vnode_check_create = biba_vnode_check_create, 3388 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3389 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3390 .mpo_vnode_check_exec = biba_vnode_check_exec, 3391 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3392 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3393 .mpo_vnode_check_link = biba_vnode_check_link, 3394 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3395 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3396 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3397 .mpo_vnode_check_open = biba_vnode_check_open, 3398 .mpo_vnode_check_poll = biba_vnode_check_poll, 3399 .mpo_vnode_check_read = biba_vnode_check_read, 3400 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3401 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3402 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3403 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3404 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3405 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3406 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3407 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3408 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3409 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3410 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3411 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3412 .mpo_vnode_check_stat = biba_vnode_check_stat, 3413 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3414 .mpo_vnode_check_write = biba_vnode_check_write, 3415 .mpo_netinet_firewall_send = biba_netinet_firewall_send, 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