mac_biba.c revision 193391
1/*- 2 * Copyright (c) 1999-2002, 2007-2009 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 193391 2009-06-03 18:46:28Z 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, &ptys_equal, 125 0, "Label pty devices as biba/equal on create"); 126TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal); 127 128static int interfaces_equal = 1; 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 || strcmp(string, "hi") == 0) { 642 element->mbe_type = MAC_BIBA_TYPE_HIGH; 643 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 644 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) { 645 element->mbe_type = MAC_BIBA_TYPE_LOW; 646 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 647 } else if (strcmp(string, "equal") == 0 || 648 strcmp(string, "eq") == 0) { 649 element->mbe_type = MAC_BIBA_TYPE_EQUAL; 650 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 651 } else { 652 element->mbe_type = MAC_BIBA_TYPE_GRADE; 653 654 /* 655 * Numeric grade piece of the element. 656 */ 657 grade = strsep(&string, ":"); 658 value = strtol(grade, &end, 10); 659 if (end == grade || *end != '\0') 660 return (EINVAL); 661 if (value < 0 || value > 65535) 662 return (EINVAL); 663 element->mbe_grade = value; 664 665 /* 666 * Optional compartment piece of the element. If none are 667 * included, we assume that the label has no compartments. 668 */ 669 if (string == NULL) 670 return (0); 671 if (*string == '\0') 672 return (0); 673 674 while ((compartment = strsep(&string, "+")) != NULL) { 675 value = strtol(compartment, &end, 10); 676 if (compartment == end || *end != '\0') 677 return (EINVAL); 678 if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS) 679 return (EINVAL); 680 MAC_BIBA_BIT_SET(value, element->mbe_compartments); 681 } 682 } 683 684 return (0); 685} 686 687/* 688 * Note: destructively consumes the string, make a local copy before calling 689 * if that's a problem. 690 */ 691static int 692biba_parse(struct mac_biba *mb, char *string) 693{ 694 char *rangehigh, *rangelow, *effective; 695 int error; 696 697 effective = strsep(&string, "("); 698 if (*effective == '\0') 699 effective = NULL; 700 701 if (string != NULL) { 702 rangelow = strsep(&string, "-"); 703 if (string == NULL) 704 return (EINVAL); 705 rangehigh = strsep(&string, ")"); 706 if (string == NULL) 707 return (EINVAL); 708 if (*string != '\0') 709 return (EINVAL); 710 } else { 711 rangelow = NULL; 712 rangehigh = NULL; 713 } 714 715 KASSERT((rangelow != NULL && rangehigh != NULL) || 716 (rangelow == NULL && rangehigh == NULL), 717 ("biba_parse: range mismatch")); 718 719 bzero(mb, sizeof(*mb)); 720 if (effective != NULL) { 721 error = biba_parse_element(&mb->mb_effective, effective); 722 if (error) 723 return (error); 724 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; 725 } 726 727 if (rangelow != NULL) { 728 error = biba_parse_element(&mb->mb_rangelow, rangelow); 729 if (error) 730 return (error); 731 error = biba_parse_element(&mb->mb_rangehigh, rangehigh); 732 if (error) 733 return (error); 734 mb->mb_flags |= MAC_BIBA_FLAG_RANGE; 735 } 736 737 error = biba_valid(mb); 738 if (error) 739 return (error); 740 741 return (0); 742} 743 744static int 745biba_internalize_label(struct label *label, char *element_name, 746 char *element_data, int *claimed) 747{ 748 struct mac_biba *mb, mb_temp; 749 int error; 750 751 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 752 return (0); 753 754 (*claimed)++; 755 756 error = biba_parse(&mb_temp, element_data); 757 if (error) 758 return (error); 759 760 mb = SLOT(label); 761 *mb = mb_temp; 762 763 return (0); 764} 765 766static void 767biba_copy_label(struct label *src, struct label *dest) 768{ 769 770 *SLOT(dest) = *SLOT(src); 771} 772 773/* 774 * Object-specific entry point implementations are sorted alphabetically by 775 * object type name and then by operation. 776 */ 777static int 778biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 779 struct ifnet *ifp, struct label *ifplabel) 780{ 781 struct mac_biba *a, *b; 782 783 if (!biba_enabled) 784 return (0); 785 786 a = SLOT(dlabel); 787 b = SLOT(ifplabel); 788 789 if (biba_equal_effective(a, b)) 790 return (0); 791 return (EACCES); 792} 793 794static void 795biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d, 796 struct label *dlabel) 797{ 798 struct mac_biba *source, *dest; 799 800 source = SLOT(cred->cr_label); 801 dest = SLOT(dlabel); 802 803 biba_copy_effective(source, dest); 804} 805 806static void 807biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, 808 struct mbuf *m, struct label *mlabel) 809{ 810 struct mac_biba *source, *dest; 811 812 source = SLOT(dlabel); 813 dest = SLOT(mlabel); 814 815 biba_copy_effective(source, dest); 816} 817 818static void 819biba_cred_associate_nfsd(struct ucred *cred) 820{ 821 struct mac_biba *label; 822 823 label = SLOT(cred->cr_label); 824 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); 825 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 826 0, NULL); 827} 828 829static int 830biba_cred_check_relabel(struct ucred *cred, struct label *newlabel) 831{ 832 struct mac_biba *subj, *new; 833 int error; 834 835 subj = SLOT(cred->cr_label); 836 new = SLOT(newlabel); 837 838 /* 839 * If there is a Biba label update for the credential, it may 840 * be an update of the effective, range, or both. 841 */ 842 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 843 if (error) 844 return (error); 845 846 /* 847 * If the Biba label is to be changed, authorize as appropriate. 848 */ 849 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 850 /* 851 * If the change request modifies both the Biba label 852 * effective and range, check that the new effective will be 853 * in the new range. 854 */ 855 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 856 MAC_BIBA_FLAGS_BOTH && 857 !biba_effective_in_range(new, new)) 858 return (EINVAL); 859 860 /* 861 * To change the Biba effective label on a credential, the 862 * new effective label must be in the current range. 863 */ 864 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && 865 !biba_effective_in_range(new, subj)) 866 return (EPERM); 867 868 /* 869 * To change the Biba range on a credential, the new range 870 * label must be in the current range. 871 */ 872 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 873 !biba_range_in_range(new, subj)) 874 return (EPERM); 875 876 /* 877 * To have EQUAL in any component of the new credential Biba 878 * label, the subject must already have EQUAL in their label. 879 */ 880 if (biba_contains_equal(new)) { 881 error = biba_subject_privileged(subj); 882 if (error) 883 return (error); 884 } 885 } 886 887 return (0); 888} 889 890static int 891biba_cred_check_visible(struct ucred *u1, struct ucred *u2) 892{ 893 struct mac_biba *subj, *obj; 894 895 if (!biba_enabled) 896 return (0); 897 898 subj = SLOT(u1->cr_label); 899 obj = SLOT(u2->cr_label); 900 901 /* XXX: range */ 902 if (!biba_dominate_effective(obj, subj)) 903 return (ESRCH); 904 905 return (0); 906} 907 908static void 909biba_cred_create_init(struct ucred *cred) 910{ 911 struct mac_biba *dest; 912 913 dest = SLOT(cred->cr_label); 914 915 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 916 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 917 0, NULL); 918} 919 920static void 921biba_cred_create_swapper(struct ucred *cred) 922{ 923 struct mac_biba *dest; 924 925 dest = SLOT(cred->cr_label); 926 927 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 928 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 929 0, NULL); 930} 931 932static void 933biba_cred_relabel(struct ucred *cred, struct label *newlabel) 934{ 935 struct mac_biba *source, *dest; 936 937 source = SLOT(newlabel); 938 dest = SLOT(cred->cr_label); 939 940 biba_copy(source, dest); 941} 942 943static void 944biba_devfs_create_device(struct ucred *cred, struct mount *mp, 945 struct cdev *dev, struct devfs_dirent *de, struct label *delabel) 946{ 947 struct mac_biba *mb; 948 int biba_type; 949 950 mb = SLOT(delabel); 951 if (strcmp(dev->si_name, "null") == 0 || 952 strcmp(dev->si_name, "zero") == 0 || 953 strcmp(dev->si_name, "random") == 0 || 954 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 955 biba_type = MAC_BIBA_TYPE_EQUAL; 956 else if (ptys_equal && 957 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 958 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 959 biba_type = MAC_BIBA_TYPE_EQUAL; 960 else 961 biba_type = MAC_BIBA_TYPE_HIGH; 962 biba_set_effective(mb, biba_type, 0, NULL); 963} 964 965static void 966biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 967 struct devfs_dirent *de, struct label *delabel) 968{ 969 struct mac_biba *mb; 970 971 mb = SLOT(delabel); 972 973 biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL); 974} 975 976static void 977biba_devfs_create_symlink(struct ucred *cred, struct mount *mp, 978 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 979 struct label *delabel) 980{ 981 struct mac_biba *source, *dest; 982 983 source = SLOT(cred->cr_label); 984 dest = SLOT(delabel); 985 986 biba_copy_effective(source, dest); 987} 988 989static void 990biba_devfs_update(struct mount *mp, struct devfs_dirent *de, 991 struct label *delabel, struct vnode *vp, struct label *vplabel) 992{ 993 struct mac_biba *source, *dest; 994 995 source = SLOT(vplabel); 996 dest = SLOT(delabel); 997 998 biba_copy(source, dest); 999} 1000 1001static void 1002biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel, 1003 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 1004 struct label *vplabel) 1005{ 1006 struct mac_biba *source, *dest; 1007 1008 source = SLOT(delabel); 1009 dest = SLOT(vplabel); 1010 1011 biba_copy_effective(source, dest); 1012} 1013 1014static int 1015biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1016 struct label *ifplabel, struct label *newlabel) 1017{ 1018 struct mac_biba *subj, *new; 1019 int error; 1020 1021 subj = SLOT(cred->cr_label); 1022 new = SLOT(newlabel); 1023 1024 /* 1025 * If there is a Biba label update for the interface, it may be an 1026 * update of the effective, range, or both. 1027 */ 1028 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1029 if (error) 1030 return (error); 1031 1032 /* 1033 * Relabling network interfaces requires Biba privilege. 1034 */ 1035 error = biba_subject_privileged(subj); 1036 if (error) 1037 return (error); 1038 1039 return (0); 1040} 1041 1042static int 1043biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1044 struct mbuf *m, struct label *mlabel) 1045{ 1046 struct mac_biba *p, *i; 1047 1048 if (!biba_enabled) 1049 return (0); 1050 1051 p = SLOT(mlabel); 1052 i = SLOT(ifplabel); 1053 1054 return (biba_effective_in_range(p, i) ? 0 : EACCES); 1055} 1056 1057static void 1058biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1059{ 1060 char tifname[IFNAMSIZ], *p, *q; 1061 char tiflist[sizeof(trusted_interfaces)]; 1062 struct mac_biba *dest; 1063 int len, type; 1064 1065 dest = SLOT(ifplabel); 1066 1067 if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) { 1068 type = MAC_BIBA_TYPE_EQUAL; 1069 goto set; 1070 } 1071 1072 if (trust_all_interfaces) { 1073 type = MAC_BIBA_TYPE_HIGH; 1074 goto set; 1075 } 1076 1077 type = MAC_BIBA_TYPE_LOW; 1078 1079 if (trusted_interfaces[0] == '\0' || 1080 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1081 goto set; 1082 1083 bzero(tiflist, sizeof(tiflist)); 1084 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1085 if(*p != ' ' && *p != '\t') 1086 *q = *p; 1087 1088 for (p = q = tiflist;; p++) { 1089 if (*p == ',' || *p == '\0') { 1090 len = p - q; 1091 if (len < IFNAMSIZ) { 1092 bzero(tifname, sizeof(tifname)); 1093 bcopy(q, tifname, len); 1094 if (strcmp(tifname, ifp->if_xname) == 0) { 1095 type = MAC_BIBA_TYPE_HIGH; 1096 break; 1097 } 1098 } else { 1099 *p = '\0'; 1100 printf("mac_biba warning: interface name " 1101 "\"%s\" is too long (must be < %d)\n", 1102 q, IFNAMSIZ); 1103 } 1104 if (*p == '\0') 1105 break; 1106 q = p + 1; 1107 } 1108 } 1109set: 1110 biba_set_effective(dest, type, 0, NULL); 1111 biba_set_range(dest, type, 0, NULL, type, 0, NULL); 1112} 1113 1114static void 1115biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1116 struct mbuf *m, struct label *mlabel) 1117{ 1118 struct mac_biba *source, *dest; 1119 1120 source = SLOT(ifplabel); 1121 dest = SLOT(mlabel); 1122 1123 biba_copy_effective(source, dest); 1124} 1125 1126static void 1127biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1128 struct label *ifplabel, struct label *newlabel) 1129{ 1130 struct mac_biba *source, *dest; 1131 1132 source = SLOT(newlabel); 1133 dest = SLOT(ifplabel); 1134 1135 biba_copy(source, dest); 1136} 1137 1138static int 1139biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1140 struct mbuf *m, struct label *mlabel) 1141{ 1142 struct mac_biba *p, *i; 1143 1144 if (!biba_enabled) 1145 return (0); 1146 1147 p = SLOT(mlabel); 1148 i = SLOT(inplabel); 1149 1150 return (biba_equal_effective(p, i) ? 0 : EACCES); 1151} 1152 1153static int 1154biba_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, 1155 struct label *inplabel) 1156{ 1157 struct mac_biba *subj, *obj; 1158 1159 if (!biba_enabled) 1160 return (0); 1161 1162 subj = SLOT(cred->cr_label); 1163 obj = SLOT(inplabel); 1164 1165 if (!biba_dominate_effective(obj, subj)) 1166 return (ENOENT); 1167 1168 return (0); 1169} 1170 1171static void 1172biba_inpcb_create(struct socket *so, struct label *solabel, 1173 struct inpcb *inp, struct label *inplabel) 1174{ 1175 struct mac_biba *source, *dest; 1176 1177 source = SLOT(solabel); 1178 dest = SLOT(inplabel); 1179 1180 SOCK_LOCK(so); 1181 biba_copy_effective(source, dest); 1182 SOCK_UNLOCK(so); 1183} 1184 1185static void 1186biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1187 struct mbuf *m, struct label *mlabel) 1188{ 1189 struct mac_biba *source, *dest; 1190 1191 source = SLOT(inplabel); 1192 dest = SLOT(mlabel); 1193 1194 biba_copy_effective(source, dest); 1195} 1196 1197static void 1198biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1199 struct inpcb *inp, struct label *inplabel) 1200{ 1201 struct mac_biba *source, *dest; 1202 1203 SOCK_LOCK_ASSERT(so); 1204 1205 source = SLOT(solabel); 1206 dest = SLOT(inplabel); 1207 1208 biba_copy(source, dest); 1209} 1210 1211static void 1212biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1213 struct label *q6label) 1214{ 1215 struct mac_biba *source, *dest; 1216 1217 source = SLOT(mlabel); 1218 dest = SLOT(q6label); 1219 1220 biba_copy_effective(source, dest); 1221} 1222 1223static int 1224biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1225 struct label *q6label) 1226{ 1227 struct mac_biba *a, *b; 1228 1229 a = SLOT(q6label); 1230 b = SLOT(mlabel); 1231 1232 return (biba_equal_effective(a, b)); 1233} 1234 1235static void 1236biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, 1237 struct label *mlabel) 1238{ 1239 struct mac_biba *source, *dest; 1240 1241 source = SLOT(q6label); 1242 dest = SLOT(mlabel); 1243 1244 /* Just use the head, since we require them all to match. */ 1245 biba_copy_effective(source, dest); 1246} 1247 1248static void 1249biba_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1250 struct label *q6label) 1251{ 1252 1253 /* NOOP: we only accept matching labels, so no need to update */ 1254} 1255 1256static void 1257biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, 1258 struct label *qlabel) 1259{ 1260 struct mac_biba *source, *dest; 1261 1262 source = SLOT(mlabel); 1263 dest = SLOT(qlabel); 1264 1265 biba_copy_effective(source, dest); 1266} 1267 1268static int 1269biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, 1270 struct label *qlabel) 1271{ 1272 struct mac_biba *a, *b; 1273 1274 a = SLOT(qlabel); 1275 b = SLOT(mlabel); 1276 1277 return (biba_equal_effective(a, b)); 1278} 1279 1280static void 1281biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, 1282 struct label *mlabel) 1283{ 1284 struct mac_biba *source, *dest; 1285 1286 source = SLOT(qlabel); 1287 dest = SLOT(mlabel); 1288 1289 /* Just use the head, since we require them all to match. */ 1290 biba_copy_effective(source, dest); 1291} 1292 1293static void 1294biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, 1295 struct label *qlabel) 1296{ 1297 1298 /* NOOP: we only accept matching labels, so no need to update */ 1299} 1300 1301static int 1302biba_kld_check_load(struct ucred *cred, struct vnode *vp, 1303 struct label *vplabel) 1304{ 1305 struct mac_biba *subj, *obj; 1306 int error; 1307 1308 if (!biba_enabled) 1309 return (0); 1310 1311 subj = SLOT(cred->cr_label); 1312 1313 error = biba_subject_privileged(subj); 1314 if (error) 1315 return (error); 1316 1317 obj = SLOT(vplabel); 1318 if (!biba_high_effective(obj)) 1319 return (EACCES); 1320 1321 return (0); 1322} 1323 1324static int 1325biba_mount_check_stat(struct ucred *cred, struct mount *mp, 1326 struct label *mplabel) 1327{ 1328 struct mac_biba *subj, *obj; 1329 1330 if (!biba_enabled) 1331 return (0); 1332 1333 subj = SLOT(cred->cr_label); 1334 obj = SLOT(mplabel); 1335 1336 if (!biba_dominate_effective(obj, subj)) 1337 return (EACCES); 1338 1339 return (0); 1340} 1341 1342static void 1343biba_mount_create(struct ucred *cred, struct mount *mp, 1344 struct label *mplabel) 1345{ 1346 struct mac_biba *source, *dest; 1347 1348 source = SLOT(cred->cr_label); 1349 dest = SLOT(mplabel); 1350 1351 biba_copy_effective(source, dest); 1352} 1353 1354static void 1355biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1356 struct mbuf *m, struct label *mlabel) 1357{ 1358 struct mac_biba *dest; 1359 1360 dest = SLOT(mlabel); 1361 1362 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1363} 1364 1365static void 1366biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1367 struct mbuf *m, struct label *mlabel) 1368{ 1369 struct mac_biba *dest; 1370 1371 dest = SLOT(mlabel); 1372 1373 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1374} 1375 1376static void 1377biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1378 struct mbuf *msend, struct label *msendlabel) 1379{ 1380 struct mac_biba *source, *dest; 1381 1382 source = SLOT(mrecvlabel); 1383 dest = SLOT(msendlabel); 1384 1385 biba_copy_effective(source, dest); 1386} 1387 1388static void 1389biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1390{ 1391 struct mac_biba *dest; 1392 1393 dest = SLOT(mlabel); 1394 1395 /* XXX: where is the label for the firewall really coming from? */ 1396 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1397} 1398 1399static void 1400biba_netinet_fragment(struct mbuf *m, struct label *mlabel, 1401 struct mbuf *frag, struct label *fraglabel) 1402{ 1403 struct mac_biba *source, *dest; 1404 1405 source = SLOT(mlabel); 1406 dest = SLOT(fraglabel); 1407 1408 biba_copy_effective(source, dest); 1409} 1410 1411static void 1412biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1413 struct mbuf *msend, struct label *msendlabel) 1414{ 1415 struct mac_biba *source, *dest; 1416 1417 source = SLOT(mrecvlabel); 1418 dest = SLOT(msendlabel); 1419 1420 biba_copy_effective(source, dest); 1421} 1422 1423static void 1424biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1425 struct mbuf *m, struct label *mlabel) 1426{ 1427 struct mac_biba *dest; 1428 1429 dest = SLOT(mlabel); 1430 1431 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1432} 1433 1434static void 1435biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1436 struct mbuf *m, struct label *mlabel) 1437{ 1438 struct mac_biba *dest; 1439 1440 dest = SLOT(mlabel); 1441 1442 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1443} 1444 1445static int 1446biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1447 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1448{ 1449 1450 if(!biba_enabled) 1451 return (0); 1452 1453 /* XXX: This will be implemented soon... */ 1454 1455 return (0); 1456} 1457 1458static int 1459biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1460 struct label *pplabel) 1461{ 1462 struct mac_biba *subj, *obj; 1463 1464 if (!biba_enabled) 1465 return (0); 1466 1467 subj = SLOT(cred->cr_label); 1468 obj = SLOT(pplabel); 1469 1470 if (!biba_dominate_effective(obj, subj)) 1471 return (EACCES); 1472 1473 return (0); 1474} 1475 1476static int 1477biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1478 struct label *pplabel) 1479{ 1480 struct mac_biba *subj, *obj; 1481 1482 if (!biba_enabled) 1483 return (0); 1484 1485 subj = SLOT(cred->cr_label); 1486 obj = SLOT(pplabel); 1487 1488 if (!biba_dominate_effective(obj, subj)) 1489 return (EACCES); 1490 1491 return (0); 1492} 1493 1494static int 1495biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1496 struct label *pplabel, struct label *newlabel) 1497{ 1498 struct mac_biba *subj, *obj, *new; 1499 int error; 1500 1501 new = SLOT(newlabel); 1502 subj = SLOT(cred->cr_label); 1503 obj = SLOT(pplabel); 1504 1505 /* 1506 * If there is a Biba label update for a pipe, it must be a effective 1507 * update. 1508 */ 1509 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1510 if (error) 1511 return (error); 1512 1513 /* 1514 * To perform a relabel of a pipe (Biba label or not), Biba must 1515 * authorize the relabel. 1516 */ 1517 if (!biba_effective_in_range(obj, subj)) 1518 return (EPERM); 1519 1520 /* 1521 * If the Biba label is to be changed, authorize as appropriate. 1522 */ 1523 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1524 /* 1525 * To change the Biba label on a pipe, the new pipe label 1526 * must be in the subject range. 1527 */ 1528 if (!biba_effective_in_range(new, subj)) 1529 return (EPERM); 1530 1531 /* 1532 * To change the Biba label on a pipe to be EQUAL, the 1533 * subject must have appropriate privilege. 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_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 1547 struct label *pplabel) 1548{ 1549 struct mac_biba *subj, *obj; 1550 1551 if (!biba_enabled) 1552 return (0); 1553 1554 subj = SLOT(cred->cr_label); 1555 obj = SLOT(pplabel); 1556 1557 if (!biba_dominate_effective(obj, subj)) 1558 return (EACCES); 1559 1560 return (0); 1561} 1562 1563static int 1564biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1565 struct label *pplabel) 1566{ 1567 struct mac_biba *subj, *obj; 1568 1569 if (!biba_enabled) 1570 return (0); 1571 1572 subj = SLOT(cred->cr_label); 1573 obj = SLOT(pplabel); 1574 1575 if (!biba_dominate_effective(subj, obj)) 1576 return (EACCES); 1577 1578 return (0); 1579} 1580 1581static void 1582biba_pipe_create(struct ucred *cred, struct pipepair *pp, 1583 struct label *pplabel) 1584{ 1585 struct mac_biba *source, *dest; 1586 1587 source = SLOT(cred->cr_label); 1588 dest = SLOT(pplabel); 1589 1590 biba_copy_effective(source, dest); 1591} 1592 1593static void 1594biba_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1595 struct label *pplabel, struct label *newlabel) 1596{ 1597 struct mac_biba *source, *dest; 1598 1599 source = SLOT(newlabel); 1600 dest = SLOT(pplabel); 1601 1602 biba_copy(source, dest); 1603} 1604 1605static int 1606biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks, 1607 struct label *kslabel) 1608{ 1609 struct mac_biba *subj, *obj; 1610 1611 if (!biba_enabled) 1612 return (0); 1613 1614 subj = SLOT(cred->cr_label); 1615 obj = SLOT(kslabel); 1616 1617 if (!biba_dominate_effective(subj, obj)) 1618 return (EACCES); 1619 1620 return (0); 1621} 1622 1623static int 1624biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred, 1625 struct ksem *ks, struct label *kslabel) 1626{ 1627 struct mac_biba *subj, *obj; 1628 1629 if (!biba_enabled) 1630 return (0); 1631 1632 subj = SLOT(active_cred->cr_label); 1633 obj = SLOT(kslabel); 1634 1635 if (!biba_dominate_effective(subj, obj)) 1636 return (EACCES); 1637 1638 return (0); 1639} 1640 1641static int 1642biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred, 1643 struct ksem *ks, struct label *kslabel) 1644{ 1645 struct mac_biba *subj, *obj; 1646 1647 if (!biba_enabled) 1648 return (0); 1649 1650 subj = SLOT(active_cred->cr_label); 1651 obj = SLOT(kslabel); 1652 1653 if (!biba_dominate_effective(obj, subj)) 1654 return (EACCES); 1655 1656 return (0); 1657} 1658 1659static void 1660biba_posixsem_create(struct ucred *cred, struct ksem *ks, 1661 struct label *kslabel) 1662{ 1663 struct mac_biba *source, *dest; 1664 1665 source = SLOT(cred->cr_label); 1666 dest = SLOT(kslabel); 1667 1668 biba_copy_effective(source, dest); 1669} 1670 1671/* 1672 * Some system privileges are allowed regardless of integrity grade; others 1673 * are allowed only when running with privilege with respect to the Biba 1674 * policy as they might otherwise allow bypassing of the integrity policy. 1675 */ 1676static int 1677biba_priv_check(struct ucred *cred, int priv) 1678{ 1679 struct mac_biba *subj; 1680 int error; 1681 1682 if (!biba_enabled) 1683 return (0); 1684 1685 /* 1686 * Exempt only specific privileges from the Biba integrity policy. 1687 */ 1688 switch (priv) { 1689 case PRIV_KTRACE: 1690 case PRIV_MSGBUF: 1691 1692 /* 1693 * Allow processes to manipulate basic process audit properties, and 1694 * to submit audit records. 1695 */ 1696 case PRIV_AUDIT_GETAUDIT: 1697 case PRIV_AUDIT_SETAUDIT: 1698 case PRIV_AUDIT_SUBMIT: 1699 1700 /* 1701 * Allow processes to manipulate their regular UNIX credentials. 1702 */ 1703 case PRIV_CRED_SETUID: 1704 case PRIV_CRED_SETEUID: 1705 case PRIV_CRED_SETGID: 1706 case PRIV_CRED_SETEGID: 1707 case PRIV_CRED_SETGROUPS: 1708 case PRIV_CRED_SETREUID: 1709 case PRIV_CRED_SETREGID: 1710 case PRIV_CRED_SETRESUID: 1711 case PRIV_CRED_SETRESGID: 1712 1713 /* 1714 * Allow processes to perform system monitoring. 1715 */ 1716 case PRIV_SEEOTHERGIDS: 1717 case PRIV_SEEOTHERUIDS: 1718 break; 1719 1720 /* 1721 * Allow access to general process debugging facilities. We 1722 * separately control debugging based on MAC label. 1723 */ 1724 case PRIV_DEBUG_DIFFCRED: 1725 case PRIV_DEBUG_SUGID: 1726 case PRIV_DEBUG_UNPRIV: 1727 1728 /* 1729 * Allow manipulating jails. 1730 */ 1731 case PRIV_JAIL_ATTACH: 1732 1733 /* 1734 * Allow privilege with respect to the Partition policy, but not the 1735 * Privs policy. 1736 */ 1737 case PRIV_MAC_PARTITION: 1738 1739 /* 1740 * Allow privilege with respect to process resource limits and login 1741 * context. 1742 */ 1743 case PRIV_PROC_LIMIT: 1744 case PRIV_PROC_SETLOGIN: 1745 case PRIV_PROC_SETRLIMIT: 1746 1747 /* 1748 * Allow System V and POSIX IPC privileges. 1749 */ 1750 case PRIV_IPC_READ: 1751 case PRIV_IPC_WRITE: 1752 case PRIV_IPC_ADMIN: 1753 case PRIV_IPC_MSGSIZE: 1754 case PRIV_MQ_ADMIN: 1755 1756 /* 1757 * Allow certain scheduler manipulations -- possibly this should be 1758 * controlled by more fine-grained policy, as potentially low 1759 * integrity processes can deny CPU to higher integrity ones. 1760 */ 1761 case PRIV_SCHED_DIFFCRED: 1762 case PRIV_SCHED_SETPRIORITY: 1763 case PRIV_SCHED_RTPRIO: 1764 case PRIV_SCHED_SETPOLICY: 1765 case PRIV_SCHED_SET: 1766 case PRIV_SCHED_SETPARAM: 1767 1768 /* 1769 * More IPC privileges. 1770 */ 1771 case PRIV_SEM_WRITE: 1772 1773 /* 1774 * Allow signaling privileges subject to integrity policy. 1775 */ 1776 case PRIV_SIGNAL_DIFFCRED: 1777 case PRIV_SIGNAL_SUGID: 1778 1779 /* 1780 * Allow access to only limited sysctls from lower integrity levels; 1781 * piggy-back on the Jail definition. 1782 */ 1783 case PRIV_SYSCTL_WRITEJAIL: 1784 1785 /* 1786 * Allow TTY-based privileges, subject to general device access using 1787 * labels on TTY device nodes, but not console privilege. 1788 */ 1789 case PRIV_TTY_DRAINWAIT: 1790 case PRIV_TTY_DTRWAIT: 1791 case PRIV_TTY_EXCLUSIVE: 1792 case PRIV_TTY_PRISON: 1793 case PRIV_TTY_STI: 1794 case PRIV_TTY_SETA: 1795 1796 /* 1797 * Grant most VFS privileges, as almost all are in practice bounded 1798 * by more specific checks using labels. 1799 */ 1800 case PRIV_VFS_READ: 1801 case PRIV_VFS_WRITE: 1802 case PRIV_VFS_ADMIN: 1803 case PRIV_VFS_EXEC: 1804 case PRIV_VFS_LOOKUP: 1805 case PRIV_VFS_CHFLAGS_DEV: 1806 case PRIV_VFS_CHOWN: 1807 case PRIV_VFS_CHROOT: 1808 case PRIV_VFS_RETAINSUGID: 1809 case PRIV_VFS_EXCEEDQUOTA: 1810 case PRIV_VFS_FCHROOT: 1811 case PRIV_VFS_FHOPEN: 1812 case PRIV_VFS_FHSTATFS: 1813 case PRIV_VFS_GENERATION: 1814 case PRIV_VFS_GETFH: 1815 case PRIV_VFS_GETQUOTA: 1816 case PRIV_VFS_LINK: 1817 case PRIV_VFS_MOUNT: 1818 case PRIV_VFS_MOUNT_OWNER: 1819 case PRIV_VFS_MOUNT_PERM: 1820 case PRIV_VFS_MOUNT_SUIDDIR: 1821 case PRIV_VFS_MOUNT_NONUSER: 1822 case PRIV_VFS_SETGID: 1823 case PRIV_VFS_STICKYFILE: 1824 case PRIV_VFS_SYSFLAGS: 1825 case PRIV_VFS_UNMOUNT: 1826 1827 /* 1828 * Allow VM privileges; it would be nice if these were subject to 1829 * resource limits. 1830 */ 1831 case PRIV_VM_MADV_PROTECT: 1832 case PRIV_VM_MLOCK: 1833 case PRIV_VM_MUNLOCK: 1834 1835 /* 1836 * Allow some but not all network privileges. In general, dont allow 1837 * reconfiguring the network stack, just normal use. 1838 */ 1839 case PRIV_NETATALK_RESERVEDPORT: 1840 case PRIV_NETINET_RESERVEDPORT: 1841 case PRIV_NETINET_RAW: 1842 case PRIV_NETINET_REUSEPORT: 1843 case PRIV_NETIPX_RESERVEDPORT: 1844 case PRIV_NETIPX_RAW: 1845 break; 1846 1847 /* 1848 * All remaining system privileges are allow only if the process 1849 * holds privilege with respect to the Biba policy. 1850 */ 1851 default: 1852 subj = SLOT(cred->cr_label); 1853 error = biba_subject_privileged(subj); 1854 if (error) 1855 return (error); 1856 } 1857 return (0); 1858} 1859 1860static int 1861biba_proc_check_debug(struct ucred *cred, struct proc *p) 1862{ 1863 struct mac_biba *subj, *obj; 1864 1865 if (!biba_enabled) 1866 return (0); 1867 1868 subj = SLOT(cred->cr_label); 1869 obj = SLOT(p->p_ucred->cr_label); 1870 1871 /* XXX: range checks */ 1872 if (!biba_dominate_effective(obj, subj)) 1873 return (ESRCH); 1874 if (!biba_dominate_effective(subj, obj)) 1875 return (EACCES); 1876 1877 return (0); 1878} 1879 1880static int 1881biba_proc_check_sched(struct ucred *cred, struct proc *p) 1882{ 1883 struct mac_biba *subj, *obj; 1884 1885 if (!biba_enabled) 1886 return (0); 1887 1888 subj = SLOT(cred->cr_label); 1889 obj = SLOT(p->p_ucred->cr_label); 1890 1891 /* XXX: range checks */ 1892 if (!biba_dominate_effective(obj, subj)) 1893 return (ESRCH); 1894 if (!biba_dominate_effective(subj, obj)) 1895 return (EACCES); 1896 1897 return (0); 1898} 1899 1900static int 1901biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1902{ 1903 struct mac_biba *subj, *obj; 1904 1905 if (!biba_enabled) 1906 return (0); 1907 1908 subj = SLOT(cred->cr_label); 1909 obj = SLOT(p->p_ucred->cr_label); 1910 1911 /* XXX: range checks */ 1912 if (!biba_dominate_effective(obj, subj)) 1913 return (ESRCH); 1914 if (!biba_dominate_effective(subj, obj)) 1915 return (EACCES); 1916 1917 return (0); 1918} 1919 1920static int 1921biba_socket_check_deliver(struct socket *so, struct label *solabel, 1922 struct mbuf *m, struct label *mlabel) 1923{ 1924 struct mac_biba *p, *s; 1925 int error; 1926 1927 if (!biba_enabled) 1928 return (0); 1929 1930 p = SLOT(mlabel); 1931 s = SLOT(solabel); 1932 1933 SOCK_LOCK(so); 1934 error = biba_equal_effective(p, s) ? 0 : EACCES; 1935 SOCK_UNLOCK(so); 1936 return (error); 1937} 1938 1939static int 1940biba_socket_check_relabel(struct ucred *cred, struct socket *so, 1941 struct label *solabel, struct label *newlabel) 1942{ 1943 struct mac_biba *subj, *obj, *new; 1944 int error; 1945 1946 SOCK_LOCK_ASSERT(so); 1947 1948 new = SLOT(newlabel); 1949 subj = SLOT(cred->cr_label); 1950 obj = SLOT(solabel); 1951 1952 /* 1953 * If there is a Biba label update for the socket, it may be an 1954 * update of effective. 1955 */ 1956 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1957 if (error) 1958 return (error); 1959 1960 /* 1961 * To relabel a socket, the old socket effective must be in the 1962 * subject range. 1963 */ 1964 if (!biba_effective_in_range(obj, subj)) 1965 return (EPERM); 1966 1967 /* 1968 * If the Biba label is to be changed, authorize as appropriate. 1969 */ 1970 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1971 /* 1972 * To relabel a socket, the new socket effective must be in 1973 * the subject range. 1974 */ 1975 if (!biba_effective_in_range(new, subj)) 1976 return (EPERM); 1977 1978 /* 1979 * To change the Biba label on the socket to contain EQUAL, 1980 * the subject must have appropriate privilege. 1981 */ 1982 if (biba_contains_equal(new)) { 1983 error = biba_subject_privileged(subj); 1984 if (error) 1985 return (error); 1986 } 1987 } 1988 1989 return (0); 1990} 1991 1992static int 1993biba_socket_check_visible(struct ucred *cred, struct socket *so, 1994 struct label *solabel) 1995{ 1996 struct mac_biba *subj, *obj; 1997 1998 if (!biba_enabled) 1999 return (0); 2000 2001 subj = SLOT(cred->cr_label); 2002 obj = SLOT(solabel); 2003 2004 SOCK_LOCK(so); 2005 if (!biba_dominate_effective(obj, subj)) { 2006 SOCK_UNLOCK(so); 2007 return (ENOENT); 2008 } 2009 SOCK_UNLOCK(so); 2010 2011 return (0); 2012} 2013 2014static void 2015biba_socket_create(struct ucred *cred, struct socket *so, 2016 struct label *solabel) 2017{ 2018 struct mac_biba *source, *dest; 2019 2020 source = SLOT(cred->cr_label); 2021 dest = SLOT(solabel); 2022 2023 biba_copy_effective(source, dest); 2024} 2025 2026static void 2027biba_socket_create_mbuf(struct socket *so, struct label *solabel, 2028 struct mbuf *m, struct label *mlabel) 2029{ 2030 struct mac_biba *source, *dest; 2031 2032 source = SLOT(solabel); 2033 dest = SLOT(mlabel); 2034 2035 SOCK_LOCK(so); 2036 biba_copy_effective(source, dest); 2037 SOCK_UNLOCK(so); 2038} 2039 2040static void 2041biba_socket_newconn(struct socket *oldso, struct label *oldsolabel, 2042 struct socket *newso, struct label *newsolabel) 2043{ 2044 struct mac_biba source, *dest; 2045 2046 SOCK_LOCK(oldso); 2047 source = *SLOT(oldsolabel); 2048 SOCK_UNLOCK(oldso); 2049 2050 dest = SLOT(newsolabel); 2051 2052 SOCK_LOCK(newso); 2053 biba_copy_effective(&source, dest); 2054 SOCK_UNLOCK(newso); 2055} 2056 2057static void 2058biba_socket_relabel(struct ucred *cred, struct socket *so, 2059 struct label *solabel, struct label *newlabel) 2060{ 2061 struct mac_biba *source, *dest; 2062 2063 SOCK_LOCK_ASSERT(so); 2064 2065 source = SLOT(newlabel); 2066 dest = SLOT(solabel); 2067 2068 biba_copy(source, dest); 2069} 2070 2071static void 2072biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 2073 struct socket *so, struct label *sopeerlabel) 2074{ 2075 struct mac_biba *source, *dest; 2076 2077 source = SLOT(mlabel); 2078 dest = SLOT(sopeerlabel); 2079 2080 SOCK_LOCK(so); 2081 biba_copy_effective(source, dest); 2082 SOCK_UNLOCK(so); 2083} 2084 2085static void 2086biba_socketpeer_set_from_socket(struct socket *oldso, 2087 struct label *oldsolabel, struct socket *newso, 2088 struct label *newsopeerlabel) 2089{ 2090 struct mac_biba source, *dest; 2091 2092 SOCK_LOCK(oldso); 2093 source = *SLOT(oldsolabel); 2094 SOCK_UNLOCK(oldso); 2095 dest = SLOT(newsopeerlabel); 2096 2097 SOCK_LOCK(newso); 2098 biba_copy_effective(&source, dest); 2099 SOCK_UNLOCK(newso); 2100} 2101 2102static void 2103biba_syncache_create(struct label *label, struct inpcb *inp) 2104{ 2105 struct mac_biba *source, *dest; 2106 2107 source = SLOT(inp->inp_label); 2108 dest = SLOT(label); 2109 biba_copy_effective(source, dest); 2110} 2111 2112static void 2113biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2114 struct label *mlabel) 2115{ 2116 struct mac_biba *source, *dest; 2117 2118 source = SLOT(sc_label); 2119 dest = SLOT(mlabel); 2120 biba_copy_effective(source, dest); 2121} 2122 2123static int 2124biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2125 struct label *vplabel) 2126{ 2127 struct mac_biba *subj, *obj; 2128 int error; 2129 2130 if (!biba_enabled) 2131 return (0); 2132 2133 subj = SLOT(cred->cr_label); 2134 2135 error = biba_subject_privileged(subj); 2136 if (error) 2137 return (error); 2138 2139 if (vplabel == NULL) 2140 return (0); 2141 2142 obj = SLOT(vplabel); 2143 if (!biba_high_effective(obj)) 2144 return (EACCES); 2145 2146 return (0); 2147} 2148 2149static int 2150biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2151 struct label *vplabel) 2152{ 2153 struct mac_biba *subj, *obj; 2154 int error; 2155 2156 if (!biba_enabled) 2157 return (0); 2158 2159 subj = SLOT(cred->cr_label); 2160 2161 error = biba_subject_privileged(subj); 2162 if (error) 2163 return (error); 2164 2165 if (vplabel == NULL) 2166 return (0); 2167 2168 obj = SLOT(vplabel); 2169 if (!biba_high_effective(obj)) 2170 return (EACCES); 2171 2172 return (0); 2173} 2174 2175static int 2176biba_system_check_auditon(struct ucred *cred, int cmd) 2177{ 2178 struct mac_biba *subj; 2179 int error; 2180 2181 if (!biba_enabled) 2182 return (0); 2183 2184 subj = SLOT(cred->cr_label); 2185 2186 error = biba_subject_privileged(subj); 2187 if (error) 2188 return (error); 2189 2190 return (0); 2191} 2192 2193static int 2194biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2195 struct label *label) 2196{ 2197 struct mac_biba *subj; 2198 int error; 2199 2200 if (!biba_enabled) 2201 return (0); 2202 2203 subj = SLOT(cred->cr_label); 2204 2205 error = biba_subject_privileged(subj); 2206 if (error) 2207 return (error); 2208 2209 return (0); 2210} 2211 2212static int 2213biba_system_check_swapon(struct ucred *cred, struct vnode *vp, 2214 struct label *vplabel) 2215{ 2216 struct mac_biba *subj, *obj; 2217 int error; 2218 2219 if (!biba_enabled) 2220 return (0); 2221 2222 subj = SLOT(cred->cr_label); 2223 obj = SLOT(vplabel); 2224 2225 error = biba_subject_privileged(subj); 2226 if (error) 2227 return (error); 2228 2229 if (!biba_high_effective(obj)) 2230 return (EACCES); 2231 2232 return (0); 2233} 2234 2235static int 2236biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2237 void *arg1, int arg2, struct sysctl_req *req) 2238{ 2239 struct mac_biba *subj; 2240 int error; 2241 2242 if (!biba_enabled) 2243 return (0); 2244 2245 subj = SLOT(cred->cr_label); 2246 2247 /* 2248 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2249 * but also require privilege to change them. 2250 */ 2251 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2252 if (!biba_subject_dominate_high(subj)) 2253 return (EACCES); 2254 2255 error = biba_subject_privileged(subj); 2256 if (error) 2257 return (error); 2258 } 2259 2260 return (0); 2261} 2262 2263static void 2264biba_sysvmsg_cleanup(struct label *msglabel) 2265{ 2266 2267 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 2268} 2269 2270static void 2271biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2272 struct label *msqlabel, struct msg *msgptr, struct label *msglabel) 2273{ 2274 struct mac_biba *source, *dest; 2275 2276 /* Ignore the msgq label */ 2277 source = SLOT(cred->cr_label); 2278 dest = SLOT(msglabel); 2279 2280 biba_copy_effective(source, dest); 2281} 2282 2283static int 2284biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 2285 struct label *msglabel) 2286{ 2287 struct mac_biba *subj, *obj; 2288 2289 if (!biba_enabled) 2290 return (0); 2291 2292 subj = SLOT(cred->cr_label); 2293 obj = SLOT(msglabel); 2294 2295 if (!biba_dominate_effective(obj, subj)) 2296 return (EACCES); 2297 2298 return (0); 2299} 2300 2301static int 2302biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 2303 struct label *msglabel) 2304{ 2305 struct mac_biba *subj, *obj; 2306 2307 if (!biba_enabled) 2308 return (0); 2309 2310 subj = SLOT(cred->cr_label); 2311 obj = SLOT(msglabel); 2312 2313 if (!biba_dominate_effective(subj, obj)) 2314 return (EACCES); 2315 2316 return (0); 2317} 2318 2319static int 2320biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 2321 struct label *msqklabel) 2322{ 2323 struct mac_biba *subj, *obj; 2324 2325 if (!biba_enabled) 2326 return (0); 2327 2328 subj = SLOT(cred->cr_label); 2329 obj = SLOT(msqklabel); 2330 2331 if (!biba_dominate_effective(obj, subj)) 2332 return (EACCES); 2333 2334 return (0); 2335} 2336 2337static int 2338biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 2339 struct label *msqklabel) 2340{ 2341 struct mac_biba *subj, *obj; 2342 2343 if (!biba_enabled) 2344 return (0); 2345 2346 subj = SLOT(cred->cr_label); 2347 obj = SLOT(msqklabel); 2348 2349 if (!biba_dominate_effective(subj, obj)) 2350 return (EACCES); 2351 2352 return (0); 2353} 2354 2355static int 2356biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 2357 struct label *msqklabel) 2358{ 2359 struct mac_biba *subj, *obj; 2360 2361 if (!biba_enabled) 2362 return (0); 2363 2364 subj = SLOT(cred->cr_label); 2365 obj = SLOT(msqklabel); 2366 2367 if (!biba_dominate_effective(obj, subj)) 2368 return (EACCES); 2369 2370 return (0); 2371} 2372 2373static int 2374biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 2375 struct label *msqklabel, int cmd) 2376{ 2377 struct mac_biba *subj, *obj; 2378 2379 if (!biba_enabled) 2380 return (0); 2381 2382 subj = SLOT(cred->cr_label); 2383 obj = SLOT(msqklabel); 2384 2385 switch(cmd) { 2386 case IPC_RMID: 2387 case IPC_SET: 2388 if (!biba_dominate_effective(subj, obj)) 2389 return (EACCES); 2390 break; 2391 2392 case IPC_STAT: 2393 if (!biba_dominate_effective(obj, subj)) 2394 return (EACCES); 2395 break; 2396 2397 default: 2398 return (EACCES); 2399 } 2400 2401 return (0); 2402} 2403 2404static void 2405biba_sysvmsq_cleanup(struct label *msqlabel) 2406{ 2407 2408 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 2409} 2410 2411static void 2412biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2413 struct label *msqlabel) 2414{ 2415 struct mac_biba *source, *dest; 2416 2417 source = SLOT(cred->cr_label); 2418 dest = SLOT(msqlabel); 2419 2420 biba_copy_effective(source, dest); 2421} 2422 2423static int 2424biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 2425 struct label *semaklabel, int cmd) 2426{ 2427 struct mac_biba *subj, *obj; 2428 2429 if (!biba_enabled) 2430 return (0); 2431 2432 subj = SLOT(cred->cr_label); 2433 obj = SLOT(semaklabel); 2434 2435 switch(cmd) { 2436 case IPC_RMID: 2437 case IPC_SET: 2438 case SETVAL: 2439 case SETALL: 2440 if (!biba_dominate_effective(subj, obj)) 2441 return (EACCES); 2442 break; 2443 2444 case IPC_STAT: 2445 case GETVAL: 2446 case GETPID: 2447 case GETNCNT: 2448 case GETZCNT: 2449 case GETALL: 2450 if (!biba_dominate_effective(obj, subj)) 2451 return (EACCES); 2452 break; 2453 2454 default: 2455 return (EACCES); 2456 } 2457 2458 return (0); 2459} 2460 2461static int 2462biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 2463 struct label *semaklabel) 2464{ 2465 struct mac_biba *subj, *obj; 2466 2467 if (!biba_enabled) 2468 return (0); 2469 2470 subj = SLOT(cred->cr_label); 2471 obj = SLOT(semaklabel); 2472 2473 if (!biba_dominate_effective(obj, subj)) 2474 return (EACCES); 2475 2476 return (0); 2477} 2478 2479static int 2480biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 2481 struct label *semaklabel, size_t accesstype) 2482{ 2483 struct mac_biba *subj, *obj; 2484 2485 if (!biba_enabled) 2486 return (0); 2487 2488 subj = SLOT(cred->cr_label); 2489 obj = SLOT(semaklabel); 2490 2491 if (accesstype & SEM_R) 2492 if (!biba_dominate_effective(obj, subj)) 2493 return (EACCES); 2494 2495 if (accesstype & SEM_A) 2496 if (!biba_dominate_effective(subj, obj)) 2497 return (EACCES); 2498 2499 return (0); 2500} 2501 2502static void 2503biba_sysvsem_cleanup(struct label *semalabel) 2504{ 2505 2506 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 2507} 2508 2509static void 2510biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr, 2511 struct label *semalabel) 2512{ 2513 struct mac_biba *source, *dest; 2514 2515 source = SLOT(cred->cr_label); 2516 dest = SLOT(semalabel); 2517 2518 biba_copy_effective(source, dest); 2519} 2520 2521static int 2522biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 2523 struct label *shmseglabel, int shmflg) 2524{ 2525 struct mac_biba *subj, *obj; 2526 2527 if (!biba_enabled) 2528 return (0); 2529 2530 subj = SLOT(cred->cr_label); 2531 obj = SLOT(shmseglabel); 2532 2533 if (!biba_dominate_effective(obj, subj)) 2534 return (EACCES); 2535 if ((shmflg & SHM_RDONLY) == 0) { 2536 if (!biba_dominate_effective(subj, obj)) 2537 return (EACCES); 2538 } 2539 2540 return (0); 2541} 2542 2543static int 2544biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 2545 struct label *shmseglabel, int cmd) 2546{ 2547 struct mac_biba *subj, *obj; 2548 2549 if (!biba_enabled) 2550 return (0); 2551 2552 subj = SLOT(cred->cr_label); 2553 obj = SLOT(shmseglabel); 2554 2555 switch(cmd) { 2556 case IPC_RMID: 2557 case IPC_SET: 2558 if (!biba_dominate_effective(subj, obj)) 2559 return (EACCES); 2560 break; 2561 2562 case IPC_STAT: 2563 case SHM_STAT: 2564 if (!biba_dominate_effective(obj, subj)) 2565 return (EACCES); 2566 break; 2567 2568 default: 2569 return (EACCES); 2570 } 2571 2572 return (0); 2573} 2574 2575static int 2576biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 2577 struct label *shmseglabel, int shmflg) 2578{ 2579 struct mac_biba *subj, *obj; 2580 2581 if (!biba_enabled) 2582 return (0); 2583 2584 subj = SLOT(cred->cr_label); 2585 obj = SLOT(shmseglabel); 2586 2587 if (!biba_dominate_effective(obj, subj)) 2588 return (EACCES); 2589 2590 return (0); 2591} 2592 2593static void 2594biba_sysvshm_cleanup(struct label *shmlabel) 2595{ 2596 2597 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 2598} 2599 2600static void 2601biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr, 2602 struct label *shmlabel) 2603{ 2604 struct mac_biba *source, *dest; 2605 2606 source = SLOT(cred->cr_label); 2607 dest = SLOT(shmlabel); 2608 2609 biba_copy_effective(source, dest); 2610} 2611 2612static int 2613biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2614 struct vnode *vp, struct label *vplabel) 2615{ 2616 struct mac_biba mb_temp, *source, *dest; 2617 int buflen, error; 2618 2619 source = SLOT(mplabel); 2620 dest = SLOT(vplabel); 2621 2622 buflen = sizeof(mb_temp); 2623 bzero(&mb_temp, buflen); 2624 2625 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 2626 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread); 2627 if (error == ENOATTR || error == EOPNOTSUPP) { 2628 /* Fall back to the mntlabel. */ 2629 biba_copy_effective(source, dest); 2630 return (0); 2631 } else if (error) 2632 return (error); 2633 2634 if (buflen != sizeof(mb_temp)) { 2635 printf("biba_vnode_associate_extattr: bad size %d\n", 2636 buflen); 2637 return (EPERM); 2638 } 2639 if (biba_valid(&mb_temp) != 0) { 2640 printf("biba_vnode_associate_extattr: invalid\n"); 2641 return (EPERM); 2642 } 2643 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != 2644 MAC_BIBA_FLAG_EFFECTIVE) { 2645 printf("biba_vnode_associate_extattr: not effective\n"); 2646 return (EPERM); 2647 } 2648 2649 biba_copy_effective(&mb_temp, dest); 2650 return (0); 2651} 2652 2653static void 2654biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2655 struct vnode *vp, struct label *vplabel) 2656{ 2657 struct mac_biba *source, *dest; 2658 2659 source = SLOT(mplabel); 2660 dest = SLOT(vplabel); 2661 2662 biba_copy_effective(source, dest); 2663} 2664 2665static int 2666biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2667 struct label *dvplabel) 2668{ 2669 struct mac_biba *subj, *obj; 2670 2671 if (!biba_enabled) 2672 return (0); 2673 2674 subj = SLOT(cred->cr_label); 2675 obj = SLOT(dvplabel); 2676 2677 if (!biba_dominate_effective(obj, subj)) 2678 return (EACCES); 2679 2680 return (0); 2681} 2682 2683static int 2684biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2685 struct label *dvplabel) 2686{ 2687 struct mac_biba *subj, *obj; 2688 2689 if (!biba_enabled) 2690 return (0); 2691 2692 subj = SLOT(cred->cr_label); 2693 obj = SLOT(dvplabel); 2694 2695 if (!biba_dominate_effective(obj, subj)) 2696 return (EACCES); 2697 2698 return (0); 2699} 2700 2701static int 2702biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2703 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 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(dvplabel); 2712 2713 if (!biba_dominate_effective(subj, obj)) 2714 return (EACCES); 2715 2716 return (0); 2717} 2718 2719static int 2720biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2721 struct label *vplabel, acl_type_t type) 2722{ 2723 struct mac_biba *subj, *obj; 2724 2725 if (!biba_enabled) 2726 return (0); 2727 2728 subj = SLOT(cred->cr_label); 2729 obj = SLOT(vplabel); 2730 2731 if (!biba_dominate_effective(subj, obj)) 2732 return (EACCES); 2733 2734 return (0); 2735} 2736 2737static int 2738biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2739 struct label *vplabel, int attrnamespace, const char *name) 2740{ 2741 struct mac_biba *subj, *obj; 2742 2743 if (!biba_enabled) 2744 return (0); 2745 2746 subj = SLOT(cred->cr_label); 2747 obj = SLOT(vplabel); 2748 2749 if (!biba_dominate_effective(subj, obj)) 2750 return (EACCES); 2751 2752 return (0); 2753} 2754 2755static int 2756biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2757 struct label *vplabel, struct image_params *imgp, 2758 struct label *execlabel) 2759{ 2760 struct mac_biba *subj, *obj, *exec; 2761 int error; 2762 2763 if (execlabel != NULL) { 2764 /* 2765 * We currently don't permit labels to be changed at 2766 * exec-time as part of Biba, so disallow non-NULL Biba label 2767 * elements in the execlabel. 2768 */ 2769 exec = SLOT(execlabel); 2770 error = biba_atmostflags(exec, 0); 2771 if (error) 2772 return (error); 2773 } 2774 2775 if (!biba_enabled) 2776 return (0); 2777 2778 subj = SLOT(cred->cr_label); 2779 obj = SLOT(vplabel); 2780 2781 if (!biba_dominate_effective(obj, subj)) 2782 return (EACCES); 2783 2784 return (0); 2785} 2786 2787static int 2788biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2789 struct label *vplabel, acl_type_t type) 2790{ 2791 struct mac_biba *subj, *obj; 2792 2793 if (!biba_enabled) 2794 return (0); 2795 2796 subj = SLOT(cred->cr_label); 2797 obj = SLOT(vplabel); 2798 2799 if (!biba_dominate_effective(obj, subj)) 2800 return (EACCES); 2801 2802 return (0); 2803} 2804 2805static int 2806biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2807 struct label *vplabel, int attrnamespace, const char *name) 2808{ 2809 struct mac_biba *subj, *obj; 2810 2811 if (!biba_enabled) 2812 return (0); 2813 2814 subj = SLOT(cred->cr_label); 2815 obj = SLOT(vplabel); 2816 2817 if (!biba_dominate_effective(obj, subj)) 2818 return (EACCES); 2819 2820 return (0); 2821} 2822 2823static int 2824biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2825 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2826 struct componentname *cnp) 2827{ 2828 struct mac_biba *subj, *obj; 2829 2830 if (!biba_enabled) 2831 return (0); 2832 2833 subj = SLOT(cred->cr_label); 2834 obj = SLOT(dvplabel); 2835 2836 if (!biba_dominate_effective(subj, obj)) 2837 return (EACCES); 2838 2839 obj = SLOT(vplabel); 2840 2841 if (!biba_dominate_effective(subj, obj)) 2842 return (EACCES); 2843 2844 return (0); 2845} 2846 2847static int 2848biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2849 struct label *vplabel, int attrnamespace) 2850{ 2851 struct mac_biba *subj, *obj; 2852 2853 if (!biba_enabled) 2854 return (0); 2855 2856 subj = SLOT(cred->cr_label); 2857 obj = SLOT(vplabel); 2858 2859 if (!biba_dominate_effective(obj, subj)) 2860 return (EACCES); 2861 2862 return (0); 2863} 2864 2865static int 2866biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2867 struct label *dvplabel, struct componentname *cnp) 2868{ 2869 struct mac_biba *subj, *obj; 2870 2871 if (!biba_enabled) 2872 return (0); 2873 2874 subj = SLOT(cred->cr_label); 2875 obj = SLOT(dvplabel); 2876 2877 if (!biba_dominate_effective(obj, subj)) 2878 return (EACCES); 2879 2880 return (0); 2881} 2882 2883static int 2884biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2885 struct label *vplabel, int prot, int flags) 2886{ 2887 struct mac_biba *subj, *obj; 2888 2889 /* 2890 * Rely on the use of open()-time protections to handle 2891 * non-revocation cases. 2892 */ 2893 if (!biba_enabled || !revocation_enabled) 2894 return (0); 2895 2896 subj = SLOT(cred->cr_label); 2897 obj = SLOT(vplabel); 2898 2899 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2900 if (!biba_dominate_effective(obj, subj)) 2901 return (EACCES); 2902 } 2903 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2904 if (!biba_dominate_effective(subj, obj)) 2905 return (EACCES); 2906 } 2907 2908 return (0); 2909} 2910 2911static int 2912biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2913 struct label *vplabel, accmode_t accmode) 2914{ 2915 struct mac_biba *subj, *obj; 2916 2917 if (!biba_enabled) 2918 return (0); 2919 2920 subj = SLOT(cred->cr_label); 2921 obj = SLOT(vplabel); 2922 2923 /* XXX privilege override for admin? */ 2924 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) { 2925 if (!biba_dominate_effective(obj, subj)) 2926 return (EACCES); 2927 } 2928 if (accmode & VMODIFY_PERMS) { 2929 if (!biba_dominate_effective(subj, obj)) 2930 return (EACCES); 2931 } 2932 2933 return (0); 2934} 2935 2936static int 2937biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2938 struct vnode *vp, struct label *vplabel) 2939{ 2940 struct mac_biba *subj, *obj; 2941 2942 if (!biba_enabled || !revocation_enabled) 2943 return (0); 2944 2945 subj = SLOT(active_cred->cr_label); 2946 obj = SLOT(vplabel); 2947 2948 if (!biba_dominate_effective(obj, subj)) 2949 return (EACCES); 2950 2951 return (0); 2952} 2953 2954static int 2955biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2956 struct vnode *vp, struct label *vplabel) 2957{ 2958 struct mac_biba *subj, *obj; 2959 2960 if (!biba_enabled || !revocation_enabled) 2961 return (0); 2962 2963 subj = SLOT(active_cred->cr_label); 2964 obj = SLOT(vplabel); 2965 2966 if (!biba_dominate_effective(obj, subj)) 2967 return (EACCES); 2968 2969 return (0); 2970} 2971 2972static int 2973biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2974 struct label *dvplabel) 2975{ 2976 struct mac_biba *subj, *obj; 2977 2978 if (!biba_enabled) 2979 return (0); 2980 2981 subj = SLOT(cred->cr_label); 2982 obj = SLOT(dvplabel); 2983 2984 if (!biba_dominate_effective(obj, subj)) 2985 return (EACCES); 2986 2987 return (0); 2988} 2989 2990static int 2991biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2992 struct label *vplabel) 2993{ 2994 struct mac_biba *subj, *obj; 2995 2996 if (!biba_enabled) 2997 return (0); 2998 2999 subj = SLOT(cred->cr_label); 3000 obj = SLOT(vplabel); 3001 3002 if (!biba_dominate_effective(obj, subj)) 3003 return (EACCES); 3004 3005 return (0); 3006} 3007 3008static int 3009biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 3010 struct label *vplabel, struct label *newlabel) 3011{ 3012 struct mac_biba *old, *new, *subj; 3013 int error; 3014 3015 old = SLOT(vplabel); 3016 new = SLOT(newlabel); 3017 subj = SLOT(cred->cr_label); 3018 3019 /* 3020 * If there is a Biba label update for the vnode, it must be a 3021 * effective label. 3022 */ 3023 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 3024 if (error) 3025 return (error); 3026 3027 /* 3028 * To perform a relabel of the vnode (Biba label or not), Biba must 3029 * authorize the relabel. 3030 */ 3031 if (!biba_effective_in_range(old, subj)) 3032 return (EPERM); 3033 3034 /* 3035 * If the Biba label is to be changed, authorize as appropriate. 3036 */ 3037 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 3038 /* 3039 * To change the Biba label on a vnode, the new vnode label 3040 * must be in the subject range. 3041 */ 3042 if (!biba_effective_in_range(new, subj)) 3043 return (EPERM); 3044 3045 /* 3046 * To change the Biba label on the vnode to be EQUAL, the 3047 * subject must have appropriate privilege. 3048 */ 3049 if (biba_contains_equal(new)) { 3050 error = biba_subject_privileged(subj); 3051 if (error) 3052 return (error); 3053 } 3054 } 3055 3056 return (0); 3057} 3058 3059static int 3060biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 3061 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3062 struct componentname *cnp) 3063{ 3064 struct mac_biba *subj, *obj; 3065 3066 if (!biba_enabled) 3067 return (0); 3068 3069 subj = SLOT(cred->cr_label); 3070 obj = SLOT(dvplabel); 3071 3072 if (!biba_dominate_effective(subj, obj)) 3073 return (EACCES); 3074 3075 obj = SLOT(vplabel); 3076 3077 if (!biba_dominate_effective(subj, obj)) 3078 return (EACCES); 3079 3080 return (0); 3081} 3082 3083static int 3084biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 3085 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3086 int samedir, struct componentname *cnp) 3087{ 3088 struct mac_biba *subj, *obj; 3089 3090 if (!biba_enabled) 3091 return (0); 3092 3093 subj = SLOT(cred->cr_label); 3094 obj = SLOT(dvplabel); 3095 3096 if (!biba_dominate_effective(subj, obj)) 3097 return (EACCES); 3098 3099 if (vp != NULL) { 3100 obj = SLOT(vplabel); 3101 3102 if (!biba_dominate_effective(subj, obj)) 3103 return (EACCES); 3104 } 3105 3106 return (0); 3107} 3108 3109static int 3110biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3111 struct label *vplabel) 3112{ 3113 struct mac_biba *subj, *obj; 3114 3115 if (!biba_enabled) 3116 return (0); 3117 3118 subj = SLOT(cred->cr_label); 3119 obj = SLOT(vplabel); 3120 3121 if (!biba_dominate_effective(subj, obj)) 3122 return (EACCES); 3123 3124 return (0); 3125} 3126 3127static int 3128biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 3129 struct label *vplabel, acl_type_t type, struct acl *acl) 3130{ 3131 struct mac_biba *subj, *obj; 3132 3133 if (!biba_enabled) 3134 return (0); 3135 3136 subj = SLOT(cred->cr_label); 3137 obj = SLOT(vplabel); 3138 3139 if (!biba_dominate_effective(subj, obj)) 3140 return (EACCES); 3141 3142 return (0); 3143} 3144 3145static int 3146biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3147 struct label *vplabel, int attrnamespace, const char *name) 3148{ 3149 struct mac_biba *subj, *obj; 3150 3151 if (!biba_enabled) 3152 return (0); 3153 3154 subj = SLOT(cred->cr_label); 3155 obj = SLOT(vplabel); 3156 3157 if (!biba_dominate_effective(subj, obj)) 3158 return (EACCES); 3159 3160 /* XXX: protect the MAC EA in a special way? */ 3161 3162 return (0); 3163} 3164 3165static int 3166biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3167 struct label *vplabel, u_long flags) 3168{ 3169 struct mac_biba *subj, *obj; 3170 3171 if (!biba_enabled) 3172 return (0); 3173 3174 subj = SLOT(cred->cr_label); 3175 obj = SLOT(vplabel); 3176 3177 if (!biba_dominate_effective(subj, obj)) 3178 return (EACCES); 3179 3180 return (0); 3181} 3182 3183static int 3184biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3185 struct label *vplabel, mode_t mode) 3186{ 3187 struct mac_biba *subj, *obj; 3188 3189 if (!biba_enabled) 3190 return (0); 3191 3192 subj = SLOT(cred->cr_label); 3193 obj = SLOT(vplabel); 3194 3195 if (!biba_dominate_effective(subj, obj)) 3196 return (EACCES); 3197 3198 return (0); 3199} 3200 3201static int 3202biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3203 struct label *vplabel, uid_t uid, gid_t gid) 3204{ 3205 struct mac_biba *subj, *obj; 3206 3207 if (!biba_enabled) 3208 return (0); 3209 3210 subj = SLOT(cred->cr_label); 3211 obj = SLOT(vplabel); 3212 3213 if (!biba_dominate_effective(subj, obj)) 3214 return (EACCES); 3215 3216 return (0); 3217} 3218 3219static int 3220biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3221 struct label *vplabel, struct timespec atime, struct timespec mtime) 3222{ 3223 struct mac_biba *subj, *obj; 3224 3225 if (!biba_enabled) 3226 return (0); 3227 3228 subj = SLOT(cred->cr_label); 3229 obj = SLOT(vplabel); 3230 3231 if (!biba_dominate_effective(subj, obj)) 3232 return (EACCES); 3233 3234 return (0); 3235} 3236 3237static int 3238biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3239 struct vnode *vp, struct label *vplabel) 3240{ 3241 struct mac_biba *subj, *obj; 3242 3243 if (!biba_enabled) 3244 return (0); 3245 3246 subj = SLOT(active_cred->cr_label); 3247 obj = SLOT(vplabel); 3248 3249 if (!biba_dominate_effective(obj, subj)) 3250 return (EACCES); 3251 3252 return (0); 3253} 3254 3255static int 3256biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3257 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3258 struct componentname *cnp) 3259{ 3260 struct mac_biba *subj, *obj; 3261 3262 if (!biba_enabled) 3263 return (0); 3264 3265 subj = SLOT(cred->cr_label); 3266 obj = SLOT(dvplabel); 3267 3268 if (!biba_dominate_effective(subj, obj)) 3269 return (EACCES); 3270 3271 obj = SLOT(vplabel); 3272 3273 if (!biba_dominate_effective(subj, obj)) 3274 return (EACCES); 3275 3276 return (0); 3277} 3278 3279static int 3280biba_vnode_check_write(struct ucred *active_cred, 3281 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3282{ 3283 struct mac_biba *subj, *obj; 3284 3285 if (!biba_enabled || !revocation_enabled) 3286 return (0); 3287 3288 subj = SLOT(active_cred->cr_label); 3289 obj = SLOT(vplabel); 3290 3291 if (!biba_dominate_effective(subj, obj)) 3292 return (EACCES); 3293 3294 return (0); 3295} 3296 3297static int 3298biba_vnode_create_extattr(struct ucred *cred, struct mount *mp, 3299 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 3300 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 3301{ 3302 struct mac_biba *source, *dest, mb_temp; 3303 size_t buflen; 3304 int error; 3305 3306 buflen = sizeof(mb_temp); 3307 bzero(&mb_temp, buflen); 3308 3309 source = SLOT(cred->cr_label); 3310 dest = SLOT(vplabel); 3311 biba_copy_effective(source, &mb_temp); 3312 3313 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3314 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3315 if (error == 0) 3316 biba_copy_effective(source, dest); 3317 return (error); 3318} 3319 3320static void 3321biba_vnode_relabel(struct ucred *cred, struct vnode *vp, 3322 struct label *vplabel, struct label *newlabel) 3323{ 3324 struct mac_biba *source, *dest; 3325 3326 source = SLOT(newlabel); 3327 dest = SLOT(vplabel); 3328 3329 biba_copy(source, dest); 3330} 3331 3332static int 3333biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 3334 struct label *vplabel, struct label *intlabel) 3335{ 3336 struct mac_biba *source, mb_temp; 3337 size_t buflen; 3338 int error; 3339 3340 buflen = sizeof(mb_temp); 3341 bzero(&mb_temp, buflen); 3342 3343 source = SLOT(intlabel); 3344 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0) 3345 return (0); 3346 3347 biba_copy_effective(source, &mb_temp); 3348 3349 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3350 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3351 return (error); 3352} 3353 3354static struct mac_policy_ops mac_biba_ops = 3355{ 3356 .mpo_init = biba_init, 3357 3358 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3359 .mpo_bpfdesc_create = biba_bpfdesc_create, 3360 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, 3361 .mpo_bpfdesc_destroy_label = biba_destroy_label, 3362 .mpo_bpfdesc_init_label = biba_init_label, 3363 3364 .mpo_cred_associate_nfsd = biba_cred_associate_nfsd, 3365 .mpo_cred_check_relabel = biba_cred_check_relabel, 3366 .mpo_cred_check_visible = biba_cred_check_visible, 3367 .mpo_cred_copy_label = biba_copy_label, 3368 .mpo_cred_create_init = biba_cred_create_init, 3369 .mpo_cred_create_swapper = biba_cred_create_swapper, 3370 .mpo_cred_destroy_label = biba_destroy_label, 3371 .mpo_cred_externalize_label = biba_externalize_label, 3372 .mpo_cred_init_label = biba_init_label, 3373 .mpo_cred_internalize_label = biba_internalize_label, 3374 .mpo_cred_relabel = biba_cred_relabel, 3375 3376 .mpo_devfs_create_device = biba_devfs_create_device, 3377 .mpo_devfs_create_directory = biba_devfs_create_directory, 3378 .mpo_devfs_create_symlink = biba_devfs_create_symlink, 3379 .mpo_devfs_destroy_label = biba_destroy_label, 3380 .mpo_devfs_init_label = biba_init_label, 3381 .mpo_devfs_update = biba_devfs_update, 3382 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, 3383 3384 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3385 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3386 .mpo_ifnet_copy_label = biba_copy_label, 3387 .mpo_ifnet_create = biba_ifnet_create, 3388 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, 3389 .mpo_ifnet_destroy_label = biba_destroy_label, 3390 .mpo_ifnet_externalize_label = biba_externalize_label, 3391 .mpo_ifnet_init_label = biba_init_label, 3392 .mpo_ifnet_internalize_label = biba_internalize_label, 3393 .mpo_ifnet_relabel = biba_ifnet_relabel, 3394 3395 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3396 .mpo_inpcb_check_visible = biba_inpcb_check_visible, 3397 .mpo_inpcb_create = biba_inpcb_create, 3398 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, 3399 .mpo_inpcb_destroy_label = biba_destroy_label, 3400 .mpo_inpcb_init_label = biba_init_label_waitcheck, 3401 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, 3402 3403 .mpo_ip6q_create = biba_ip6q_create, 3404 .mpo_ip6q_destroy_label = biba_destroy_label, 3405 .mpo_ip6q_init_label = biba_init_label_waitcheck, 3406 .mpo_ip6q_match = biba_ip6q_match, 3407 .mpo_ip6q_reassemble = biba_ip6q_reassemble, 3408 .mpo_ip6q_update = biba_ip6q_update, 3409 3410 .mpo_ipq_create = biba_ipq_create, 3411 .mpo_ipq_destroy_label = biba_destroy_label, 3412 .mpo_ipq_init_label = biba_init_label_waitcheck, 3413 .mpo_ipq_match = biba_ipq_match, 3414 .mpo_ipq_reassemble = biba_ipq_reassemble, 3415 .mpo_ipq_update = biba_ipq_update, 3416 3417 .mpo_kld_check_load = biba_kld_check_load, 3418 3419 .mpo_mbuf_copy_label = biba_copy_label, 3420 .mpo_mbuf_destroy_label = biba_destroy_label, 3421 .mpo_mbuf_init_label = biba_init_label_waitcheck, 3422 3423 .mpo_mount_check_stat = biba_mount_check_stat, 3424 .mpo_mount_create = biba_mount_create, 3425 .mpo_mount_destroy_label = biba_destroy_label, 3426 .mpo_mount_init_label = biba_init_label, 3427 3428 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send, 3429 3430 .mpo_netinet_arp_send = biba_netinet_arp_send, 3431 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply, 3432 .mpo_netinet_firewall_send = biba_netinet_firewall_send, 3433 .mpo_netinet_fragment = biba_netinet_fragment, 3434 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply, 3435 .mpo_netinet_igmp_send = biba_netinet_igmp_send, 3436 3437 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send, 3438 3439 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3440 .mpo_pipe_check_poll = biba_pipe_check_poll, 3441 .mpo_pipe_check_read = biba_pipe_check_read, 3442 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3443 .mpo_pipe_check_stat = biba_pipe_check_stat, 3444 .mpo_pipe_check_write = biba_pipe_check_write, 3445 .mpo_pipe_copy_label = biba_copy_label, 3446 .mpo_pipe_create = biba_pipe_create, 3447 .mpo_pipe_destroy_label = biba_destroy_label, 3448 .mpo_pipe_externalize_label = biba_externalize_label, 3449 .mpo_pipe_init_label = biba_init_label, 3450 .mpo_pipe_internalize_label = biba_internalize_label, 3451 .mpo_pipe_relabel = biba_pipe_relabel, 3452 3453 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3454 .mpo_posixsem_check_open = biba_posixsem_check_openunlink, 3455 .mpo_posixsem_check_post = biba_posixsem_check_write, 3456 .mpo_posixsem_check_stat = biba_posixsem_check_rdonly, 3457 .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink, 3458 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3459 .mpo_posixsem_create = biba_posixsem_create, 3460 .mpo_posixsem_destroy_label = biba_destroy_label, 3461 .mpo_posixsem_init_label = biba_init_label, 3462 3463 .mpo_priv_check = biba_priv_check, 3464 3465 .mpo_proc_check_debug = biba_proc_check_debug, 3466 .mpo_proc_check_sched = biba_proc_check_sched, 3467 .mpo_proc_check_signal = biba_proc_check_signal, 3468 3469 .mpo_socket_check_deliver = biba_socket_check_deliver, 3470 .mpo_socket_check_relabel = biba_socket_check_relabel, 3471 .mpo_socket_check_visible = biba_socket_check_visible, 3472 .mpo_socket_copy_label = biba_copy_label, 3473 .mpo_socket_create = biba_socket_create, 3474 .mpo_socket_create_mbuf = biba_socket_create_mbuf, 3475 .mpo_socket_destroy_label = biba_destroy_label, 3476 .mpo_socket_externalize_label = biba_externalize_label, 3477 .mpo_socket_init_label = biba_init_label_waitcheck, 3478 .mpo_socket_internalize_label = biba_internalize_label, 3479 .mpo_socket_newconn = biba_socket_newconn, 3480 .mpo_socket_relabel = biba_socket_relabel, 3481 3482 .mpo_socketpeer_destroy_label = biba_destroy_label, 3483 .mpo_socketpeer_externalize_label = biba_externalize_label, 3484 .mpo_socketpeer_init_label = biba_init_label_waitcheck, 3485 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, 3486 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, 3487 3488 .mpo_syncache_create = biba_syncache_create, 3489 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf, 3490 .mpo_syncache_destroy_label = biba_destroy_label, 3491 .mpo_syncache_init_label = biba_init_label_waitcheck, 3492 3493 .mpo_system_check_acct = biba_system_check_acct, 3494 .mpo_system_check_auditctl = biba_system_check_auditctl, 3495 .mpo_system_check_auditon = biba_system_check_auditon, 3496 .mpo_system_check_swapoff = biba_system_check_swapoff, 3497 .mpo_system_check_swapon = biba_system_check_swapon, 3498 .mpo_system_check_sysctl = biba_system_check_sysctl, 3499 3500 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3501 .mpo_sysvmsg_create = biba_sysvmsg_create, 3502 .mpo_sysvmsg_destroy_label = biba_destroy_label, 3503 .mpo_sysvmsg_init_label = biba_init_label, 3504 3505 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3506 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3507 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3508 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3509 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3510 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3511 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3512 .mpo_sysvmsq_create = biba_sysvmsq_create, 3513 .mpo_sysvmsq_destroy_label = biba_destroy_label, 3514 .mpo_sysvmsq_init_label = biba_init_label, 3515 3516 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3517 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3518 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3519 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3520 .mpo_sysvsem_create = biba_sysvsem_create, 3521 .mpo_sysvsem_destroy_label = biba_destroy_label, 3522 .mpo_sysvsem_init_label = biba_init_label, 3523 3524 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3525 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3526 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3527 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3528 .mpo_sysvshm_create = biba_sysvshm_create, 3529 .mpo_sysvshm_destroy_label = biba_destroy_label, 3530 .mpo_sysvshm_init_label = biba_init_label, 3531 3532 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, 3533 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, 3534 .mpo_vnode_check_access = biba_vnode_check_open, 3535 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3536 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3537 .mpo_vnode_check_create = biba_vnode_check_create, 3538 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3539 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3540 .mpo_vnode_check_exec = biba_vnode_check_exec, 3541 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3542 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3543 .mpo_vnode_check_link = biba_vnode_check_link, 3544 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3545 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3546 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3547 .mpo_vnode_check_open = biba_vnode_check_open, 3548 .mpo_vnode_check_poll = biba_vnode_check_poll, 3549 .mpo_vnode_check_read = biba_vnode_check_read, 3550 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3551 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3552 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3553 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3554 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3555 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3556 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3557 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3558 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3559 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3560 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3561 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3562 .mpo_vnode_check_stat = biba_vnode_check_stat, 3563 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3564 .mpo_vnode_check_write = biba_vnode_check_write, 3565 .mpo_vnode_create_extattr = biba_vnode_create_extattr, 3566 .mpo_vnode_copy_label = biba_copy_label, 3567 .mpo_vnode_destroy_label = biba_destroy_label, 3568 .mpo_vnode_externalize_label = biba_externalize_label, 3569 .mpo_vnode_init_label = biba_init_label, 3570 .mpo_vnode_internalize_label = biba_internalize_label, 3571 .mpo_vnode_relabel = biba_vnode_relabel, 3572 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, 3573}; 3574 3575MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3576 MPC_LOADTIME_FLAG_NOTLATE, &biba_slot); 3577