mac_biba.c revision 194534
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 194534 2009-06-20 15:54:35Z ed $ 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_STI: 1793 case PRIV_TTY_SETA: 1794 1795 /* 1796 * Grant most VFS privileges, as almost all are in practice bounded 1797 * by more specific checks using labels. 1798 */ 1799 case PRIV_VFS_READ: 1800 case PRIV_VFS_WRITE: 1801 case PRIV_VFS_ADMIN: 1802 case PRIV_VFS_EXEC: 1803 case PRIV_VFS_LOOKUP: 1804 case PRIV_VFS_CHFLAGS_DEV: 1805 case PRIV_VFS_CHOWN: 1806 case PRIV_VFS_CHROOT: 1807 case PRIV_VFS_RETAINSUGID: 1808 case PRIV_VFS_EXCEEDQUOTA: 1809 case PRIV_VFS_FCHROOT: 1810 case PRIV_VFS_FHOPEN: 1811 case PRIV_VFS_FHSTATFS: 1812 case PRIV_VFS_GENERATION: 1813 case PRIV_VFS_GETFH: 1814 case PRIV_VFS_GETQUOTA: 1815 case PRIV_VFS_LINK: 1816 case PRIV_VFS_MOUNT: 1817 case PRIV_VFS_MOUNT_OWNER: 1818 case PRIV_VFS_MOUNT_PERM: 1819 case PRIV_VFS_MOUNT_SUIDDIR: 1820 case PRIV_VFS_MOUNT_NONUSER: 1821 case PRIV_VFS_SETGID: 1822 case PRIV_VFS_STICKYFILE: 1823 case PRIV_VFS_SYSFLAGS: 1824 case PRIV_VFS_UNMOUNT: 1825 1826 /* 1827 * Allow VM privileges; it would be nice if these were subject to 1828 * resource limits. 1829 */ 1830 case PRIV_VM_MADV_PROTECT: 1831 case PRIV_VM_MLOCK: 1832 case PRIV_VM_MUNLOCK: 1833 1834 /* 1835 * Allow some but not all network privileges. In general, dont allow 1836 * reconfiguring the network stack, just normal use. 1837 */ 1838 case PRIV_NETATALK_RESERVEDPORT: 1839 case PRIV_NETINET_RESERVEDPORT: 1840 case PRIV_NETINET_RAW: 1841 case PRIV_NETINET_REUSEPORT: 1842 case PRIV_NETIPX_RESERVEDPORT: 1843 case PRIV_NETIPX_RAW: 1844 break; 1845 1846 /* 1847 * All remaining system privileges are allow only if the process 1848 * holds privilege with respect to the Biba policy. 1849 */ 1850 default: 1851 subj = SLOT(cred->cr_label); 1852 error = biba_subject_privileged(subj); 1853 if (error) 1854 return (error); 1855 } 1856 return (0); 1857} 1858 1859static int 1860biba_proc_check_debug(struct ucred *cred, struct proc *p) 1861{ 1862 struct mac_biba *subj, *obj; 1863 1864 if (!biba_enabled) 1865 return (0); 1866 1867 subj = SLOT(cred->cr_label); 1868 obj = SLOT(p->p_ucred->cr_label); 1869 1870 /* XXX: range checks */ 1871 if (!biba_dominate_effective(obj, subj)) 1872 return (ESRCH); 1873 if (!biba_dominate_effective(subj, obj)) 1874 return (EACCES); 1875 1876 return (0); 1877} 1878 1879static int 1880biba_proc_check_sched(struct ucred *cred, struct proc *p) 1881{ 1882 struct mac_biba *subj, *obj; 1883 1884 if (!biba_enabled) 1885 return (0); 1886 1887 subj = SLOT(cred->cr_label); 1888 obj = SLOT(p->p_ucred->cr_label); 1889 1890 /* XXX: range checks */ 1891 if (!biba_dominate_effective(obj, subj)) 1892 return (ESRCH); 1893 if (!biba_dominate_effective(subj, obj)) 1894 return (EACCES); 1895 1896 return (0); 1897} 1898 1899static int 1900biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1901{ 1902 struct mac_biba *subj, *obj; 1903 1904 if (!biba_enabled) 1905 return (0); 1906 1907 subj = SLOT(cred->cr_label); 1908 obj = SLOT(p->p_ucred->cr_label); 1909 1910 /* XXX: range checks */ 1911 if (!biba_dominate_effective(obj, subj)) 1912 return (ESRCH); 1913 if (!biba_dominate_effective(subj, obj)) 1914 return (EACCES); 1915 1916 return (0); 1917} 1918 1919static int 1920biba_socket_check_deliver(struct socket *so, struct label *solabel, 1921 struct mbuf *m, struct label *mlabel) 1922{ 1923 struct mac_biba *p, *s; 1924 int error; 1925 1926 if (!biba_enabled) 1927 return (0); 1928 1929 p = SLOT(mlabel); 1930 s = SLOT(solabel); 1931 1932 SOCK_LOCK(so); 1933 error = biba_equal_effective(p, s) ? 0 : EACCES; 1934 SOCK_UNLOCK(so); 1935 return (error); 1936} 1937 1938static int 1939biba_socket_check_relabel(struct ucred *cred, struct socket *so, 1940 struct label *solabel, struct label *newlabel) 1941{ 1942 struct mac_biba *subj, *obj, *new; 1943 int error; 1944 1945 SOCK_LOCK_ASSERT(so); 1946 1947 new = SLOT(newlabel); 1948 subj = SLOT(cred->cr_label); 1949 obj = SLOT(solabel); 1950 1951 /* 1952 * If there is a Biba label update for the socket, it may be an 1953 * update of effective. 1954 */ 1955 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1956 if (error) 1957 return (error); 1958 1959 /* 1960 * To relabel a socket, the old socket effective must be in the 1961 * subject range. 1962 */ 1963 if (!biba_effective_in_range(obj, subj)) 1964 return (EPERM); 1965 1966 /* 1967 * If the Biba label is to be changed, authorize as appropriate. 1968 */ 1969 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1970 /* 1971 * To relabel a socket, the new socket effective must be in 1972 * the subject range. 1973 */ 1974 if (!biba_effective_in_range(new, subj)) 1975 return (EPERM); 1976 1977 /* 1978 * To change the Biba label on the socket to contain EQUAL, 1979 * the subject must have appropriate privilege. 1980 */ 1981 if (biba_contains_equal(new)) { 1982 error = biba_subject_privileged(subj); 1983 if (error) 1984 return (error); 1985 } 1986 } 1987 1988 return (0); 1989} 1990 1991static int 1992biba_socket_check_visible(struct ucred *cred, struct socket *so, 1993 struct label *solabel) 1994{ 1995 struct mac_biba *subj, *obj; 1996 1997 if (!biba_enabled) 1998 return (0); 1999 2000 subj = SLOT(cred->cr_label); 2001 obj = SLOT(solabel); 2002 2003 SOCK_LOCK(so); 2004 if (!biba_dominate_effective(obj, subj)) { 2005 SOCK_UNLOCK(so); 2006 return (ENOENT); 2007 } 2008 SOCK_UNLOCK(so); 2009 2010 return (0); 2011} 2012 2013static void 2014biba_socket_create(struct ucred *cred, struct socket *so, 2015 struct label *solabel) 2016{ 2017 struct mac_biba *source, *dest; 2018 2019 source = SLOT(cred->cr_label); 2020 dest = SLOT(solabel); 2021 2022 biba_copy_effective(source, dest); 2023} 2024 2025static void 2026biba_socket_create_mbuf(struct socket *so, struct label *solabel, 2027 struct mbuf *m, struct label *mlabel) 2028{ 2029 struct mac_biba *source, *dest; 2030 2031 source = SLOT(solabel); 2032 dest = SLOT(mlabel); 2033 2034 SOCK_LOCK(so); 2035 biba_copy_effective(source, dest); 2036 SOCK_UNLOCK(so); 2037} 2038 2039static void 2040biba_socket_newconn(struct socket *oldso, struct label *oldsolabel, 2041 struct socket *newso, struct label *newsolabel) 2042{ 2043 struct mac_biba source, *dest; 2044 2045 SOCK_LOCK(oldso); 2046 source = *SLOT(oldsolabel); 2047 SOCK_UNLOCK(oldso); 2048 2049 dest = SLOT(newsolabel); 2050 2051 SOCK_LOCK(newso); 2052 biba_copy_effective(&source, dest); 2053 SOCK_UNLOCK(newso); 2054} 2055 2056static void 2057biba_socket_relabel(struct ucred *cred, struct socket *so, 2058 struct label *solabel, struct label *newlabel) 2059{ 2060 struct mac_biba *source, *dest; 2061 2062 SOCK_LOCK_ASSERT(so); 2063 2064 source = SLOT(newlabel); 2065 dest = SLOT(solabel); 2066 2067 biba_copy(source, dest); 2068} 2069 2070static void 2071biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 2072 struct socket *so, struct label *sopeerlabel) 2073{ 2074 struct mac_biba *source, *dest; 2075 2076 source = SLOT(mlabel); 2077 dest = SLOT(sopeerlabel); 2078 2079 SOCK_LOCK(so); 2080 biba_copy_effective(source, dest); 2081 SOCK_UNLOCK(so); 2082} 2083 2084static void 2085biba_socketpeer_set_from_socket(struct socket *oldso, 2086 struct label *oldsolabel, struct socket *newso, 2087 struct label *newsopeerlabel) 2088{ 2089 struct mac_biba source, *dest; 2090 2091 SOCK_LOCK(oldso); 2092 source = *SLOT(oldsolabel); 2093 SOCK_UNLOCK(oldso); 2094 dest = SLOT(newsopeerlabel); 2095 2096 SOCK_LOCK(newso); 2097 biba_copy_effective(&source, dest); 2098 SOCK_UNLOCK(newso); 2099} 2100 2101static void 2102biba_syncache_create(struct label *label, struct inpcb *inp) 2103{ 2104 struct mac_biba *source, *dest; 2105 2106 source = SLOT(inp->inp_label); 2107 dest = SLOT(label); 2108 biba_copy_effective(source, dest); 2109} 2110 2111static void 2112biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2113 struct label *mlabel) 2114{ 2115 struct mac_biba *source, *dest; 2116 2117 source = SLOT(sc_label); 2118 dest = SLOT(mlabel); 2119 biba_copy_effective(source, dest); 2120} 2121 2122static int 2123biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2124 struct label *vplabel) 2125{ 2126 struct mac_biba *subj, *obj; 2127 int error; 2128 2129 if (!biba_enabled) 2130 return (0); 2131 2132 subj = SLOT(cred->cr_label); 2133 2134 error = biba_subject_privileged(subj); 2135 if (error) 2136 return (error); 2137 2138 if (vplabel == NULL) 2139 return (0); 2140 2141 obj = SLOT(vplabel); 2142 if (!biba_high_effective(obj)) 2143 return (EACCES); 2144 2145 return (0); 2146} 2147 2148static int 2149biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2150 struct label *vplabel) 2151{ 2152 struct mac_biba *subj, *obj; 2153 int error; 2154 2155 if (!biba_enabled) 2156 return (0); 2157 2158 subj = SLOT(cred->cr_label); 2159 2160 error = biba_subject_privileged(subj); 2161 if (error) 2162 return (error); 2163 2164 if (vplabel == NULL) 2165 return (0); 2166 2167 obj = SLOT(vplabel); 2168 if (!biba_high_effective(obj)) 2169 return (EACCES); 2170 2171 return (0); 2172} 2173 2174static int 2175biba_system_check_auditon(struct ucred *cred, int cmd) 2176{ 2177 struct mac_biba *subj; 2178 int error; 2179 2180 if (!biba_enabled) 2181 return (0); 2182 2183 subj = SLOT(cred->cr_label); 2184 2185 error = biba_subject_privileged(subj); 2186 if (error) 2187 return (error); 2188 2189 return (0); 2190} 2191 2192static int 2193biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2194 struct label *label) 2195{ 2196 struct mac_biba *subj; 2197 int error; 2198 2199 if (!biba_enabled) 2200 return (0); 2201 2202 subj = SLOT(cred->cr_label); 2203 2204 error = biba_subject_privileged(subj); 2205 if (error) 2206 return (error); 2207 2208 return (0); 2209} 2210 2211static int 2212biba_system_check_swapon(struct ucred *cred, struct vnode *vp, 2213 struct label *vplabel) 2214{ 2215 struct mac_biba *subj, *obj; 2216 int error; 2217 2218 if (!biba_enabled) 2219 return (0); 2220 2221 subj = SLOT(cred->cr_label); 2222 obj = SLOT(vplabel); 2223 2224 error = biba_subject_privileged(subj); 2225 if (error) 2226 return (error); 2227 2228 if (!biba_high_effective(obj)) 2229 return (EACCES); 2230 2231 return (0); 2232} 2233 2234static int 2235biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2236 void *arg1, int arg2, struct sysctl_req *req) 2237{ 2238 struct mac_biba *subj; 2239 int error; 2240 2241 if (!biba_enabled) 2242 return (0); 2243 2244 subj = SLOT(cred->cr_label); 2245 2246 /* 2247 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2248 * but also require privilege to change them. 2249 */ 2250 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2251 if (!biba_subject_dominate_high(subj)) 2252 return (EACCES); 2253 2254 error = biba_subject_privileged(subj); 2255 if (error) 2256 return (error); 2257 } 2258 2259 return (0); 2260} 2261 2262static void 2263biba_sysvmsg_cleanup(struct label *msglabel) 2264{ 2265 2266 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 2267} 2268 2269static void 2270biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2271 struct label *msqlabel, struct msg *msgptr, struct label *msglabel) 2272{ 2273 struct mac_biba *source, *dest; 2274 2275 /* Ignore the msgq label */ 2276 source = SLOT(cred->cr_label); 2277 dest = SLOT(msglabel); 2278 2279 biba_copy_effective(source, dest); 2280} 2281 2282static int 2283biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 2284 struct label *msglabel) 2285{ 2286 struct mac_biba *subj, *obj; 2287 2288 if (!biba_enabled) 2289 return (0); 2290 2291 subj = SLOT(cred->cr_label); 2292 obj = SLOT(msglabel); 2293 2294 if (!biba_dominate_effective(obj, subj)) 2295 return (EACCES); 2296 2297 return (0); 2298} 2299 2300static int 2301biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 2302 struct label *msglabel) 2303{ 2304 struct mac_biba *subj, *obj; 2305 2306 if (!biba_enabled) 2307 return (0); 2308 2309 subj = SLOT(cred->cr_label); 2310 obj = SLOT(msglabel); 2311 2312 if (!biba_dominate_effective(subj, obj)) 2313 return (EACCES); 2314 2315 return (0); 2316} 2317 2318static int 2319biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 2320 struct label *msqklabel) 2321{ 2322 struct mac_biba *subj, *obj; 2323 2324 if (!biba_enabled) 2325 return (0); 2326 2327 subj = SLOT(cred->cr_label); 2328 obj = SLOT(msqklabel); 2329 2330 if (!biba_dominate_effective(obj, subj)) 2331 return (EACCES); 2332 2333 return (0); 2334} 2335 2336static int 2337biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 2338 struct label *msqklabel) 2339{ 2340 struct mac_biba *subj, *obj; 2341 2342 if (!biba_enabled) 2343 return (0); 2344 2345 subj = SLOT(cred->cr_label); 2346 obj = SLOT(msqklabel); 2347 2348 if (!biba_dominate_effective(subj, obj)) 2349 return (EACCES); 2350 2351 return (0); 2352} 2353 2354static int 2355biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 2356 struct label *msqklabel) 2357{ 2358 struct mac_biba *subj, *obj; 2359 2360 if (!biba_enabled) 2361 return (0); 2362 2363 subj = SLOT(cred->cr_label); 2364 obj = SLOT(msqklabel); 2365 2366 if (!biba_dominate_effective(obj, subj)) 2367 return (EACCES); 2368 2369 return (0); 2370} 2371 2372static int 2373biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 2374 struct label *msqklabel, int cmd) 2375{ 2376 struct mac_biba *subj, *obj; 2377 2378 if (!biba_enabled) 2379 return (0); 2380 2381 subj = SLOT(cred->cr_label); 2382 obj = SLOT(msqklabel); 2383 2384 switch(cmd) { 2385 case IPC_RMID: 2386 case IPC_SET: 2387 if (!biba_dominate_effective(subj, obj)) 2388 return (EACCES); 2389 break; 2390 2391 case IPC_STAT: 2392 if (!biba_dominate_effective(obj, subj)) 2393 return (EACCES); 2394 break; 2395 2396 default: 2397 return (EACCES); 2398 } 2399 2400 return (0); 2401} 2402 2403static void 2404biba_sysvmsq_cleanup(struct label *msqlabel) 2405{ 2406 2407 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 2408} 2409 2410static void 2411biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2412 struct label *msqlabel) 2413{ 2414 struct mac_biba *source, *dest; 2415 2416 source = SLOT(cred->cr_label); 2417 dest = SLOT(msqlabel); 2418 2419 biba_copy_effective(source, dest); 2420} 2421 2422static int 2423biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 2424 struct label *semaklabel, int cmd) 2425{ 2426 struct mac_biba *subj, *obj; 2427 2428 if (!biba_enabled) 2429 return (0); 2430 2431 subj = SLOT(cred->cr_label); 2432 obj = SLOT(semaklabel); 2433 2434 switch(cmd) { 2435 case IPC_RMID: 2436 case IPC_SET: 2437 case SETVAL: 2438 case SETALL: 2439 if (!biba_dominate_effective(subj, obj)) 2440 return (EACCES); 2441 break; 2442 2443 case IPC_STAT: 2444 case GETVAL: 2445 case GETPID: 2446 case GETNCNT: 2447 case GETZCNT: 2448 case GETALL: 2449 if (!biba_dominate_effective(obj, subj)) 2450 return (EACCES); 2451 break; 2452 2453 default: 2454 return (EACCES); 2455 } 2456 2457 return (0); 2458} 2459 2460static int 2461biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 2462 struct label *semaklabel) 2463{ 2464 struct mac_biba *subj, *obj; 2465 2466 if (!biba_enabled) 2467 return (0); 2468 2469 subj = SLOT(cred->cr_label); 2470 obj = SLOT(semaklabel); 2471 2472 if (!biba_dominate_effective(obj, subj)) 2473 return (EACCES); 2474 2475 return (0); 2476} 2477 2478static int 2479biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 2480 struct label *semaklabel, size_t accesstype) 2481{ 2482 struct mac_biba *subj, *obj; 2483 2484 if (!biba_enabled) 2485 return (0); 2486 2487 subj = SLOT(cred->cr_label); 2488 obj = SLOT(semaklabel); 2489 2490 if (accesstype & SEM_R) 2491 if (!biba_dominate_effective(obj, subj)) 2492 return (EACCES); 2493 2494 if (accesstype & SEM_A) 2495 if (!biba_dominate_effective(subj, obj)) 2496 return (EACCES); 2497 2498 return (0); 2499} 2500 2501static void 2502biba_sysvsem_cleanup(struct label *semalabel) 2503{ 2504 2505 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 2506} 2507 2508static void 2509biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr, 2510 struct label *semalabel) 2511{ 2512 struct mac_biba *source, *dest; 2513 2514 source = SLOT(cred->cr_label); 2515 dest = SLOT(semalabel); 2516 2517 biba_copy_effective(source, dest); 2518} 2519 2520static int 2521biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 2522 struct label *shmseglabel, int shmflg) 2523{ 2524 struct mac_biba *subj, *obj; 2525 2526 if (!biba_enabled) 2527 return (0); 2528 2529 subj = SLOT(cred->cr_label); 2530 obj = SLOT(shmseglabel); 2531 2532 if (!biba_dominate_effective(obj, subj)) 2533 return (EACCES); 2534 if ((shmflg & SHM_RDONLY) == 0) { 2535 if (!biba_dominate_effective(subj, obj)) 2536 return (EACCES); 2537 } 2538 2539 return (0); 2540} 2541 2542static int 2543biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 2544 struct label *shmseglabel, int cmd) 2545{ 2546 struct mac_biba *subj, *obj; 2547 2548 if (!biba_enabled) 2549 return (0); 2550 2551 subj = SLOT(cred->cr_label); 2552 obj = SLOT(shmseglabel); 2553 2554 switch(cmd) { 2555 case IPC_RMID: 2556 case IPC_SET: 2557 if (!biba_dominate_effective(subj, obj)) 2558 return (EACCES); 2559 break; 2560 2561 case IPC_STAT: 2562 case SHM_STAT: 2563 if (!biba_dominate_effective(obj, subj)) 2564 return (EACCES); 2565 break; 2566 2567 default: 2568 return (EACCES); 2569 } 2570 2571 return (0); 2572} 2573 2574static int 2575biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 2576 struct label *shmseglabel, int shmflg) 2577{ 2578 struct mac_biba *subj, *obj; 2579 2580 if (!biba_enabled) 2581 return (0); 2582 2583 subj = SLOT(cred->cr_label); 2584 obj = SLOT(shmseglabel); 2585 2586 if (!biba_dominate_effective(obj, subj)) 2587 return (EACCES); 2588 2589 return (0); 2590} 2591 2592static void 2593biba_sysvshm_cleanup(struct label *shmlabel) 2594{ 2595 2596 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 2597} 2598 2599static void 2600biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr, 2601 struct label *shmlabel) 2602{ 2603 struct mac_biba *source, *dest; 2604 2605 source = SLOT(cred->cr_label); 2606 dest = SLOT(shmlabel); 2607 2608 biba_copy_effective(source, dest); 2609} 2610 2611static int 2612biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2613 struct vnode *vp, struct label *vplabel) 2614{ 2615 struct mac_biba mb_temp, *source, *dest; 2616 int buflen, error; 2617 2618 source = SLOT(mplabel); 2619 dest = SLOT(vplabel); 2620 2621 buflen = sizeof(mb_temp); 2622 bzero(&mb_temp, buflen); 2623 2624 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 2625 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread); 2626 if (error == ENOATTR || error == EOPNOTSUPP) { 2627 /* Fall back to the mntlabel. */ 2628 biba_copy_effective(source, dest); 2629 return (0); 2630 } else if (error) 2631 return (error); 2632 2633 if (buflen != sizeof(mb_temp)) { 2634 printf("biba_vnode_associate_extattr: bad size %d\n", 2635 buflen); 2636 return (EPERM); 2637 } 2638 if (biba_valid(&mb_temp) != 0) { 2639 printf("biba_vnode_associate_extattr: invalid\n"); 2640 return (EPERM); 2641 } 2642 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != 2643 MAC_BIBA_FLAG_EFFECTIVE) { 2644 printf("biba_vnode_associate_extattr: not effective\n"); 2645 return (EPERM); 2646 } 2647 2648 biba_copy_effective(&mb_temp, dest); 2649 return (0); 2650} 2651 2652static void 2653biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2654 struct vnode *vp, struct label *vplabel) 2655{ 2656 struct mac_biba *source, *dest; 2657 2658 source = SLOT(mplabel); 2659 dest = SLOT(vplabel); 2660 2661 biba_copy_effective(source, dest); 2662} 2663 2664static int 2665biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2666 struct label *dvplabel) 2667{ 2668 struct mac_biba *subj, *obj; 2669 2670 if (!biba_enabled) 2671 return (0); 2672 2673 subj = SLOT(cred->cr_label); 2674 obj = SLOT(dvplabel); 2675 2676 if (!biba_dominate_effective(obj, subj)) 2677 return (EACCES); 2678 2679 return (0); 2680} 2681 2682static int 2683biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2684 struct label *dvplabel) 2685{ 2686 struct mac_biba *subj, *obj; 2687 2688 if (!biba_enabled) 2689 return (0); 2690 2691 subj = SLOT(cred->cr_label); 2692 obj = SLOT(dvplabel); 2693 2694 if (!biba_dominate_effective(obj, subj)) 2695 return (EACCES); 2696 2697 return (0); 2698} 2699 2700static int 2701biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2702 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2703{ 2704 struct mac_biba *subj, *obj; 2705 2706 if (!biba_enabled) 2707 return (0); 2708 2709 subj = SLOT(cred->cr_label); 2710 obj = SLOT(dvplabel); 2711 2712 if (!biba_dominate_effective(subj, obj)) 2713 return (EACCES); 2714 2715 return (0); 2716} 2717 2718static int 2719biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2720 struct label *vplabel, acl_type_t type) 2721{ 2722 struct mac_biba *subj, *obj; 2723 2724 if (!biba_enabled) 2725 return (0); 2726 2727 subj = SLOT(cred->cr_label); 2728 obj = SLOT(vplabel); 2729 2730 if (!biba_dominate_effective(subj, obj)) 2731 return (EACCES); 2732 2733 return (0); 2734} 2735 2736static int 2737biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2738 struct label *vplabel, int attrnamespace, const char *name) 2739{ 2740 struct mac_biba *subj, *obj; 2741 2742 if (!biba_enabled) 2743 return (0); 2744 2745 subj = SLOT(cred->cr_label); 2746 obj = SLOT(vplabel); 2747 2748 if (!biba_dominate_effective(subj, obj)) 2749 return (EACCES); 2750 2751 return (0); 2752} 2753 2754static int 2755biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2756 struct label *vplabel, struct image_params *imgp, 2757 struct label *execlabel) 2758{ 2759 struct mac_biba *subj, *obj, *exec; 2760 int error; 2761 2762 if (execlabel != NULL) { 2763 /* 2764 * We currently don't permit labels to be changed at 2765 * exec-time as part of Biba, so disallow non-NULL Biba label 2766 * elements in the execlabel. 2767 */ 2768 exec = SLOT(execlabel); 2769 error = biba_atmostflags(exec, 0); 2770 if (error) 2771 return (error); 2772 } 2773 2774 if (!biba_enabled) 2775 return (0); 2776 2777 subj = SLOT(cred->cr_label); 2778 obj = SLOT(vplabel); 2779 2780 if (!biba_dominate_effective(obj, subj)) 2781 return (EACCES); 2782 2783 return (0); 2784} 2785 2786static int 2787biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2788 struct label *vplabel, acl_type_t type) 2789{ 2790 struct mac_biba *subj, *obj; 2791 2792 if (!biba_enabled) 2793 return (0); 2794 2795 subj = SLOT(cred->cr_label); 2796 obj = SLOT(vplabel); 2797 2798 if (!biba_dominate_effective(obj, subj)) 2799 return (EACCES); 2800 2801 return (0); 2802} 2803 2804static int 2805biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2806 struct label *vplabel, int attrnamespace, const char *name) 2807{ 2808 struct mac_biba *subj, *obj; 2809 2810 if (!biba_enabled) 2811 return (0); 2812 2813 subj = SLOT(cred->cr_label); 2814 obj = SLOT(vplabel); 2815 2816 if (!biba_dominate_effective(obj, subj)) 2817 return (EACCES); 2818 2819 return (0); 2820} 2821 2822static int 2823biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2824 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2825 struct componentname *cnp) 2826{ 2827 struct mac_biba *subj, *obj; 2828 2829 if (!biba_enabled) 2830 return (0); 2831 2832 subj = SLOT(cred->cr_label); 2833 obj = SLOT(dvplabel); 2834 2835 if (!biba_dominate_effective(subj, obj)) 2836 return (EACCES); 2837 2838 obj = SLOT(vplabel); 2839 2840 if (!biba_dominate_effective(subj, obj)) 2841 return (EACCES); 2842 2843 return (0); 2844} 2845 2846static int 2847biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2848 struct label *vplabel, int attrnamespace) 2849{ 2850 struct mac_biba *subj, *obj; 2851 2852 if (!biba_enabled) 2853 return (0); 2854 2855 subj = SLOT(cred->cr_label); 2856 obj = SLOT(vplabel); 2857 2858 if (!biba_dominate_effective(obj, subj)) 2859 return (EACCES); 2860 2861 return (0); 2862} 2863 2864static int 2865biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2866 struct label *dvplabel, struct componentname *cnp) 2867{ 2868 struct mac_biba *subj, *obj; 2869 2870 if (!biba_enabled) 2871 return (0); 2872 2873 subj = SLOT(cred->cr_label); 2874 obj = SLOT(dvplabel); 2875 2876 if (!biba_dominate_effective(obj, subj)) 2877 return (EACCES); 2878 2879 return (0); 2880} 2881 2882static int 2883biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2884 struct label *vplabel, int prot, int flags) 2885{ 2886 struct mac_biba *subj, *obj; 2887 2888 /* 2889 * Rely on the use of open()-time protections to handle 2890 * non-revocation cases. 2891 */ 2892 if (!biba_enabled || !revocation_enabled) 2893 return (0); 2894 2895 subj = SLOT(cred->cr_label); 2896 obj = SLOT(vplabel); 2897 2898 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2899 if (!biba_dominate_effective(obj, subj)) 2900 return (EACCES); 2901 } 2902 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2903 if (!biba_dominate_effective(subj, obj)) 2904 return (EACCES); 2905 } 2906 2907 return (0); 2908} 2909 2910static int 2911biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2912 struct label *vplabel, accmode_t accmode) 2913{ 2914 struct mac_biba *subj, *obj; 2915 2916 if (!biba_enabled) 2917 return (0); 2918 2919 subj = SLOT(cred->cr_label); 2920 obj = SLOT(vplabel); 2921 2922 /* XXX privilege override for admin? */ 2923 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) { 2924 if (!biba_dominate_effective(obj, subj)) 2925 return (EACCES); 2926 } 2927 if (accmode & VMODIFY_PERMS) { 2928 if (!biba_dominate_effective(subj, obj)) 2929 return (EACCES); 2930 } 2931 2932 return (0); 2933} 2934 2935static int 2936biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2937 struct vnode *vp, struct label *vplabel) 2938{ 2939 struct mac_biba *subj, *obj; 2940 2941 if (!biba_enabled || !revocation_enabled) 2942 return (0); 2943 2944 subj = SLOT(active_cred->cr_label); 2945 obj = SLOT(vplabel); 2946 2947 if (!biba_dominate_effective(obj, subj)) 2948 return (EACCES); 2949 2950 return (0); 2951} 2952 2953static int 2954biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2955 struct vnode *vp, struct label *vplabel) 2956{ 2957 struct mac_biba *subj, *obj; 2958 2959 if (!biba_enabled || !revocation_enabled) 2960 return (0); 2961 2962 subj = SLOT(active_cred->cr_label); 2963 obj = SLOT(vplabel); 2964 2965 if (!biba_dominate_effective(obj, subj)) 2966 return (EACCES); 2967 2968 return (0); 2969} 2970 2971static int 2972biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2973 struct label *dvplabel) 2974{ 2975 struct mac_biba *subj, *obj; 2976 2977 if (!biba_enabled) 2978 return (0); 2979 2980 subj = SLOT(cred->cr_label); 2981 obj = SLOT(dvplabel); 2982 2983 if (!biba_dominate_effective(obj, subj)) 2984 return (EACCES); 2985 2986 return (0); 2987} 2988 2989static int 2990biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2991 struct label *vplabel) 2992{ 2993 struct mac_biba *subj, *obj; 2994 2995 if (!biba_enabled) 2996 return (0); 2997 2998 subj = SLOT(cred->cr_label); 2999 obj = SLOT(vplabel); 3000 3001 if (!biba_dominate_effective(obj, subj)) 3002 return (EACCES); 3003 3004 return (0); 3005} 3006 3007static int 3008biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 3009 struct label *vplabel, struct label *newlabel) 3010{ 3011 struct mac_biba *old, *new, *subj; 3012 int error; 3013 3014 old = SLOT(vplabel); 3015 new = SLOT(newlabel); 3016 subj = SLOT(cred->cr_label); 3017 3018 /* 3019 * If there is a Biba label update for the vnode, it must be a 3020 * effective label. 3021 */ 3022 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 3023 if (error) 3024 return (error); 3025 3026 /* 3027 * To perform a relabel of the vnode (Biba label or not), Biba must 3028 * authorize the relabel. 3029 */ 3030 if (!biba_effective_in_range(old, subj)) 3031 return (EPERM); 3032 3033 /* 3034 * If the Biba label is to be changed, authorize as appropriate. 3035 */ 3036 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 3037 /* 3038 * To change the Biba label on a vnode, the new vnode label 3039 * must be in the subject range. 3040 */ 3041 if (!biba_effective_in_range(new, subj)) 3042 return (EPERM); 3043 3044 /* 3045 * To change the Biba label on the vnode to be EQUAL, the 3046 * subject must have appropriate privilege. 3047 */ 3048 if (biba_contains_equal(new)) { 3049 error = biba_subject_privileged(subj); 3050 if (error) 3051 return (error); 3052 } 3053 } 3054 3055 return (0); 3056} 3057 3058static int 3059biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 3060 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3061 struct componentname *cnp) 3062{ 3063 struct mac_biba *subj, *obj; 3064 3065 if (!biba_enabled) 3066 return (0); 3067 3068 subj = SLOT(cred->cr_label); 3069 obj = SLOT(dvplabel); 3070 3071 if (!biba_dominate_effective(subj, obj)) 3072 return (EACCES); 3073 3074 obj = SLOT(vplabel); 3075 3076 if (!biba_dominate_effective(subj, obj)) 3077 return (EACCES); 3078 3079 return (0); 3080} 3081 3082static int 3083biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 3084 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3085 int samedir, struct componentname *cnp) 3086{ 3087 struct mac_biba *subj, *obj; 3088 3089 if (!biba_enabled) 3090 return (0); 3091 3092 subj = SLOT(cred->cr_label); 3093 obj = SLOT(dvplabel); 3094 3095 if (!biba_dominate_effective(subj, obj)) 3096 return (EACCES); 3097 3098 if (vp != NULL) { 3099 obj = SLOT(vplabel); 3100 3101 if (!biba_dominate_effective(subj, obj)) 3102 return (EACCES); 3103 } 3104 3105 return (0); 3106} 3107 3108static int 3109biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3110 struct label *vplabel) 3111{ 3112 struct mac_biba *subj, *obj; 3113 3114 if (!biba_enabled) 3115 return (0); 3116 3117 subj = SLOT(cred->cr_label); 3118 obj = SLOT(vplabel); 3119 3120 if (!biba_dominate_effective(subj, obj)) 3121 return (EACCES); 3122 3123 return (0); 3124} 3125 3126static int 3127biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 3128 struct label *vplabel, acl_type_t type, struct acl *acl) 3129{ 3130 struct mac_biba *subj, *obj; 3131 3132 if (!biba_enabled) 3133 return (0); 3134 3135 subj = SLOT(cred->cr_label); 3136 obj = SLOT(vplabel); 3137 3138 if (!biba_dominate_effective(subj, obj)) 3139 return (EACCES); 3140 3141 return (0); 3142} 3143 3144static int 3145biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3146 struct label *vplabel, int attrnamespace, const char *name) 3147{ 3148 struct mac_biba *subj, *obj; 3149 3150 if (!biba_enabled) 3151 return (0); 3152 3153 subj = SLOT(cred->cr_label); 3154 obj = SLOT(vplabel); 3155 3156 if (!biba_dominate_effective(subj, obj)) 3157 return (EACCES); 3158 3159 /* XXX: protect the MAC EA in a special way? */ 3160 3161 return (0); 3162} 3163 3164static int 3165biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3166 struct label *vplabel, u_long flags) 3167{ 3168 struct mac_biba *subj, *obj; 3169 3170 if (!biba_enabled) 3171 return (0); 3172 3173 subj = SLOT(cred->cr_label); 3174 obj = SLOT(vplabel); 3175 3176 if (!biba_dominate_effective(subj, obj)) 3177 return (EACCES); 3178 3179 return (0); 3180} 3181 3182static int 3183biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3184 struct label *vplabel, mode_t mode) 3185{ 3186 struct mac_biba *subj, *obj; 3187 3188 if (!biba_enabled) 3189 return (0); 3190 3191 subj = SLOT(cred->cr_label); 3192 obj = SLOT(vplabel); 3193 3194 if (!biba_dominate_effective(subj, obj)) 3195 return (EACCES); 3196 3197 return (0); 3198} 3199 3200static int 3201biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3202 struct label *vplabel, uid_t uid, gid_t gid) 3203{ 3204 struct mac_biba *subj, *obj; 3205 3206 if (!biba_enabled) 3207 return (0); 3208 3209 subj = SLOT(cred->cr_label); 3210 obj = SLOT(vplabel); 3211 3212 if (!biba_dominate_effective(subj, obj)) 3213 return (EACCES); 3214 3215 return (0); 3216} 3217 3218static int 3219biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3220 struct label *vplabel, struct timespec atime, struct timespec mtime) 3221{ 3222 struct mac_biba *subj, *obj; 3223 3224 if (!biba_enabled) 3225 return (0); 3226 3227 subj = SLOT(cred->cr_label); 3228 obj = SLOT(vplabel); 3229 3230 if (!biba_dominate_effective(subj, obj)) 3231 return (EACCES); 3232 3233 return (0); 3234} 3235 3236static int 3237biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3238 struct vnode *vp, struct label *vplabel) 3239{ 3240 struct mac_biba *subj, *obj; 3241 3242 if (!biba_enabled) 3243 return (0); 3244 3245 subj = SLOT(active_cred->cr_label); 3246 obj = SLOT(vplabel); 3247 3248 if (!biba_dominate_effective(obj, subj)) 3249 return (EACCES); 3250 3251 return (0); 3252} 3253 3254static int 3255biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3256 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3257 struct componentname *cnp) 3258{ 3259 struct mac_biba *subj, *obj; 3260 3261 if (!biba_enabled) 3262 return (0); 3263 3264 subj = SLOT(cred->cr_label); 3265 obj = SLOT(dvplabel); 3266 3267 if (!biba_dominate_effective(subj, obj)) 3268 return (EACCES); 3269 3270 obj = SLOT(vplabel); 3271 3272 if (!biba_dominate_effective(subj, obj)) 3273 return (EACCES); 3274 3275 return (0); 3276} 3277 3278static int 3279biba_vnode_check_write(struct ucred *active_cred, 3280 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3281{ 3282 struct mac_biba *subj, *obj; 3283 3284 if (!biba_enabled || !revocation_enabled) 3285 return (0); 3286 3287 subj = SLOT(active_cred->cr_label); 3288 obj = SLOT(vplabel); 3289 3290 if (!biba_dominate_effective(subj, obj)) 3291 return (EACCES); 3292 3293 return (0); 3294} 3295 3296static int 3297biba_vnode_create_extattr(struct ucred *cred, struct mount *mp, 3298 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 3299 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 3300{ 3301 struct mac_biba *source, *dest, mb_temp; 3302 size_t buflen; 3303 int error; 3304 3305 buflen = sizeof(mb_temp); 3306 bzero(&mb_temp, buflen); 3307 3308 source = SLOT(cred->cr_label); 3309 dest = SLOT(vplabel); 3310 biba_copy_effective(source, &mb_temp); 3311 3312 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3313 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3314 if (error == 0) 3315 biba_copy_effective(source, dest); 3316 return (error); 3317} 3318 3319static void 3320biba_vnode_relabel(struct ucred *cred, struct vnode *vp, 3321 struct label *vplabel, struct label *newlabel) 3322{ 3323 struct mac_biba *source, *dest; 3324 3325 source = SLOT(newlabel); 3326 dest = SLOT(vplabel); 3327 3328 biba_copy(source, dest); 3329} 3330 3331static int 3332biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 3333 struct label *vplabel, struct label *intlabel) 3334{ 3335 struct mac_biba *source, mb_temp; 3336 size_t buflen; 3337 int error; 3338 3339 buflen = sizeof(mb_temp); 3340 bzero(&mb_temp, buflen); 3341 3342 source = SLOT(intlabel); 3343 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0) 3344 return (0); 3345 3346 biba_copy_effective(source, &mb_temp); 3347 3348 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3349 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3350 return (error); 3351} 3352 3353static struct mac_policy_ops mac_biba_ops = 3354{ 3355 .mpo_init = biba_init, 3356 3357 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3358 .mpo_bpfdesc_create = biba_bpfdesc_create, 3359 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, 3360 .mpo_bpfdesc_destroy_label = biba_destroy_label, 3361 .mpo_bpfdesc_init_label = biba_init_label, 3362 3363 .mpo_cred_associate_nfsd = biba_cred_associate_nfsd, 3364 .mpo_cred_check_relabel = biba_cred_check_relabel, 3365 .mpo_cred_check_visible = biba_cred_check_visible, 3366 .mpo_cred_copy_label = biba_copy_label, 3367 .mpo_cred_create_init = biba_cred_create_init, 3368 .mpo_cred_create_swapper = biba_cred_create_swapper, 3369 .mpo_cred_destroy_label = biba_destroy_label, 3370 .mpo_cred_externalize_label = biba_externalize_label, 3371 .mpo_cred_init_label = biba_init_label, 3372 .mpo_cred_internalize_label = biba_internalize_label, 3373 .mpo_cred_relabel = biba_cred_relabel, 3374 3375 .mpo_devfs_create_device = biba_devfs_create_device, 3376 .mpo_devfs_create_directory = biba_devfs_create_directory, 3377 .mpo_devfs_create_symlink = biba_devfs_create_symlink, 3378 .mpo_devfs_destroy_label = biba_destroy_label, 3379 .mpo_devfs_init_label = biba_init_label, 3380 .mpo_devfs_update = biba_devfs_update, 3381 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, 3382 3383 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3384 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3385 .mpo_ifnet_copy_label = biba_copy_label, 3386 .mpo_ifnet_create = biba_ifnet_create, 3387 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, 3388 .mpo_ifnet_destroy_label = biba_destroy_label, 3389 .mpo_ifnet_externalize_label = biba_externalize_label, 3390 .mpo_ifnet_init_label = biba_init_label, 3391 .mpo_ifnet_internalize_label = biba_internalize_label, 3392 .mpo_ifnet_relabel = biba_ifnet_relabel, 3393 3394 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3395 .mpo_inpcb_check_visible = biba_inpcb_check_visible, 3396 .mpo_inpcb_create = biba_inpcb_create, 3397 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, 3398 .mpo_inpcb_destroy_label = biba_destroy_label, 3399 .mpo_inpcb_init_label = biba_init_label_waitcheck, 3400 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, 3401 3402 .mpo_ip6q_create = biba_ip6q_create, 3403 .mpo_ip6q_destroy_label = biba_destroy_label, 3404 .mpo_ip6q_init_label = biba_init_label_waitcheck, 3405 .mpo_ip6q_match = biba_ip6q_match, 3406 .mpo_ip6q_reassemble = biba_ip6q_reassemble, 3407 .mpo_ip6q_update = biba_ip6q_update, 3408 3409 .mpo_ipq_create = biba_ipq_create, 3410 .mpo_ipq_destroy_label = biba_destroy_label, 3411 .mpo_ipq_init_label = biba_init_label_waitcheck, 3412 .mpo_ipq_match = biba_ipq_match, 3413 .mpo_ipq_reassemble = biba_ipq_reassemble, 3414 .mpo_ipq_update = biba_ipq_update, 3415 3416 .mpo_kld_check_load = biba_kld_check_load, 3417 3418 .mpo_mbuf_copy_label = biba_copy_label, 3419 .mpo_mbuf_destroy_label = biba_destroy_label, 3420 .mpo_mbuf_init_label = biba_init_label_waitcheck, 3421 3422 .mpo_mount_check_stat = biba_mount_check_stat, 3423 .mpo_mount_create = biba_mount_create, 3424 .mpo_mount_destroy_label = biba_destroy_label, 3425 .mpo_mount_init_label = biba_init_label, 3426 3427 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send, 3428 3429 .mpo_netinet_arp_send = biba_netinet_arp_send, 3430 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply, 3431 .mpo_netinet_firewall_send = biba_netinet_firewall_send, 3432 .mpo_netinet_fragment = biba_netinet_fragment, 3433 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply, 3434 .mpo_netinet_igmp_send = biba_netinet_igmp_send, 3435 3436 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send, 3437 3438 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3439 .mpo_pipe_check_poll = biba_pipe_check_poll, 3440 .mpo_pipe_check_read = biba_pipe_check_read, 3441 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3442 .mpo_pipe_check_stat = biba_pipe_check_stat, 3443 .mpo_pipe_check_write = biba_pipe_check_write, 3444 .mpo_pipe_copy_label = biba_copy_label, 3445 .mpo_pipe_create = biba_pipe_create, 3446 .mpo_pipe_destroy_label = biba_destroy_label, 3447 .mpo_pipe_externalize_label = biba_externalize_label, 3448 .mpo_pipe_init_label = biba_init_label, 3449 .mpo_pipe_internalize_label = biba_internalize_label, 3450 .mpo_pipe_relabel = biba_pipe_relabel, 3451 3452 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3453 .mpo_posixsem_check_open = biba_posixsem_check_openunlink, 3454 .mpo_posixsem_check_post = biba_posixsem_check_write, 3455 .mpo_posixsem_check_stat = biba_posixsem_check_rdonly, 3456 .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink, 3457 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3458 .mpo_posixsem_create = biba_posixsem_create, 3459 .mpo_posixsem_destroy_label = biba_destroy_label, 3460 .mpo_posixsem_init_label = biba_init_label, 3461 3462 .mpo_priv_check = biba_priv_check, 3463 3464 .mpo_proc_check_debug = biba_proc_check_debug, 3465 .mpo_proc_check_sched = biba_proc_check_sched, 3466 .mpo_proc_check_signal = biba_proc_check_signal, 3467 3468 .mpo_socket_check_deliver = biba_socket_check_deliver, 3469 .mpo_socket_check_relabel = biba_socket_check_relabel, 3470 .mpo_socket_check_visible = biba_socket_check_visible, 3471 .mpo_socket_copy_label = biba_copy_label, 3472 .mpo_socket_create = biba_socket_create, 3473 .mpo_socket_create_mbuf = biba_socket_create_mbuf, 3474 .mpo_socket_destroy_label = biba_destroy_label, 3475 .mpo_socket_externalize_label = biba_externalize_label, 3476 .mpo_socket_init_label = biba_init_label_waitcheck, 3477 .mpo_socket_internalize_label = biba_internalize_label, 3478 .mpo_socket_newconn = biba_socket_newconn, 3479 .mpo_socket_relabel = biba_socket_relabel, 3480 3481 .mpo_socketpeer_destroy_label = biba_destroy_label, 3482 .mpo_socketpeer_externalize_label = biba_externalize_label, 3483 .mpo_socketpeer_init_label = biba_init_label_waitcheck, 3484 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, 3485 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, 3486 3487 .mpo_syncache_create = biba_syncache_create, 3488 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf, 3489 .mpo_syncache_destroy_label = biba_destroy_label, 3490 .mpo_syncache_init_label = biba_init_label_waitcheck, 3491 3492 .mpo_system_check_acct = biba_system_check_acct, 3493 .mpo_system_check_auditctl = biba_system_check_auditctl, 3494 .mpo_system_check_auditon = biba_system_check_auditon, 3495 .mpo_system_check_swapoff = biba_system_check_swapoff, 3496 .mpo_system_check_swapon = biba_system_check_swapon, 3497 .mpo_system_check_sysctl = biba_system_check_sysctl, 3498 3499 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3500 .mpo_sysvmsg_create = biba_sysvmsg_create, 3501 .mpo_sysvmsg_destroy_label = biba_destroy_label, 3502 .mpo_sysvmsg_init_label = biba_init_label, 3503 3504 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3505 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3506 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3507 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3508 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3509 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3510 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3511 .mpo_sysvmsq_create = biba_sysvmsq_create, 3512 .mpo_sysvmsq_destroy_label = biba_destroy_label, 3513 .mpo_sysvmsq_init_label = biba_init_label, 3514 3515 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3516 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3517 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3518 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3519 .mpo_sysvsem_create = biba_sysvsem_create, 3520 .mpo_sysvsem_destroy_label = biba_destroy_label, 3521 .mpo_sysvsem_init_label = biba_init_label, 3522 3523 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3524 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3525 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3526 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3527 .mpo_sysvshm_create = biba_sysvshm_create, 3528 .mpo_sysvshm_destroy_label = biba_destroy_label, 3529 .mpo_sysvshm_init_label = biba_init_label, 3530 3531 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, 3532 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, 3533 .mpo_vnode_check_access = biba_vnode_check_open, 3534 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3535 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3536 .mpo_vnode_check_create = biba_vnode_check_create, 3537 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3538 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3539 .mpo_vnode_check_exec = biba_vnode_check_exec, 3540 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3541 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3542 .mpo_vnode_check_link = biba_vnode_check_link, 3543 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3544 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3545 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3546 .mpo_vnode_check_open = biba_vnode_check_open, 3547 .mpo_vnode_check_poll = biba_vnode_check_poll, 3548 .mpo_vnode_check_read = biba_vnode_check_read, 3549 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3550 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3551 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3552 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3553 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3554 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3555 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3556 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3557 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3558 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3559 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3560 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3561 .mpo_vnode_check_stat = biba_vnode_check_stat, 3562 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3563 .mpo_vnode_check_write = biba_vnode_check_write, 3564 .mpo_vnode_create_extattr = biba_vnode_create_extattr, 3565 .mpo_vnode_copy_label = biba_copy_label, 3566 .mpo_vnode_destroy_label = biba_destroy_label, 3567 .mpo_vnode_externalize_label = biba_externalize_label, 3568 .mpo_vnode_init_label = biba_init_label, 3569 .mpo_vnode_internalize_label = biba_internalize_label, 3570 .mpo_vnode_relabel = biba_vnode_relabel, 3571 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, 3572}; 3573 3574MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3575 MPC_LOADTIME_FLAG_NOTLATE, &biba_slot); 3576