mac_biba.c revision 187014
1/*- 2 * Copyright (c) 1999-2002, 2007-2008 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 187014 2009-01-10 09:17:16Z rwatson $ 39 */ 40 41/* 42 * Developed by the TrustedBSD Project. 43 * 44 * Biba fixed label mandatory integrity policy. 45 */ 46 47#include <sys/param.h> 48#include <sys/conf.h> 49#include <sys/extattr.h> 50#include <sys/kernel.h> 51#include <sys/ksem.h> 52#include <sys/malloc.h> 53#include <sys/mman.h> 54#include <sys/mount.h> 55#include <sys/priv.h> 56#include <sys/proc.h> 57#include <sys/sbuf.h> 58#include <sys/systm.h> 59#include <sys/sysproto.h> 60#include <sys/sysent.h> 61#include <sys/systm.h> 62#include <sys/vnode.h> 63#include <sys/file.h> 64#include <sys/socket.h> 65#include <sys/socketvar.h> 66#include <sys/pipe.h> 67#include <sys/sx.h> 68#include <sys/sysctl.h> 69#include <sys/msg.h> 70#include <sys/sem.h> 71#include <sys/shm.h> 72 73#include <fs/devfs/devfs.h> 74 75#include <net/bpfdesc.h> 76#include <net/if.h> 77#include <net/if_types.h> 78#include <net/if_var.h> 79 80#include <netinet/in.h> 81#include <netinet/in_pcb.h> 82#include <netinet/ip_var.h> 83 84#include <vm/uma.h> 85#include <vm/vm.h> 86 87#include <security/mac/mac_policy.h> 88#include <security/mac_biba/mac_biba.h> 89 90SYSCTL_DECL(_security_mac); 91 92SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0, 93 "TrustedBSD mac_biba policy controls"); 94 95static int biba_label_size = sizeof(struct mac_biba); 96SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD, 97 &biba_label_size, 0, "Size of struct mac_biba"); 98 99static int biba_enabled = 1; 100SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, &biba_enabled, 101 0, "Enforce MAC/Biba policy"); 102TUNABLE_INT("security.mac.biba.enabled", &biba_enabled); 103 104static int destroyed_not_inited; 105SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 106 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 107 108static int trust_all_interfaces = 0; 109SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, 110 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); 111TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces); 112 113static char trusted_interfaces[128]; 114SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD, 115 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); 116TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces, 117 sizeof(trusted_interfaces)); 118 119static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS; 120SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD, 121 &max_compartments, 0, "Maximum supported compartments"); 122 123static int ptys_equal = 0; 124SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, &ptys_equal, 125 0, "Label pty devices as biba/equal on create"); 126TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal); 127 128static int interfaces_equal; 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 biba_copy_effective(source, dest); 1181} 1182 1183static void 1184biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1185 struct mbuf *m, struct label *mlabel) 1186{ 1187 struct mac_biba *source, *dest; 1188 1189 source = SLOT(inplabel); 1190 dest = SLOT(mlabel); 1191 1192 biba_copy_effective(source, dest); 1193} 1194 1195static void 1196biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1197 struct inpcb *inp, struct label *inplabel) 1198{ 1199 struct mac_biba *source, *dest; 1200 1201 source = SLOT(solabel); 1202 dest = SLOT(inplabel); 1203 1204 biba_copy(source, dest); 1205} 1206 1207static void 1208biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1209 struct label *q6label) 1210{ 1211 struct mac_biba *source, *dest; 1212 1213 source = SLOT(mlabel); 1214 dest = SLOT(q6label); 1215 1216 biba_copy_effective(source, dest); 1217} 1218 1219static int 1220biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1221 struct label *q6label) 1222{ 1223 struct mac_biba *a, *b; 1224 1225 a = SLOT(q6label); 1226 b = SLOT(mlabel); 1227 1228 return (biba_equal_effective(a, b)); 1229} 1230 1231static void 1232biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, 1233 struct label *mlabel) 1234{ 1235 struct mac_biba *source, *dest; 1236 1237 source = SLOT(q6label); 1238 dest = SLOT(mlabel); 1239 1240 /* Just use the head, since we require them all to match. */ 1241 biba_copy_effective(source, dest); 1242} 1243 1244static void 1245biba_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1246 struct label *q6label) 1247{ 1248 1249 /* NOOP: we only accept matching labels, so no need to update */ 1250} 1251 1252static void 1253biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, 1254 struct label *qlabel) 1255{ 1256 struct mac_biba *source, *dest; 1257 1258 source = SLOT(mlabel); 1259 dest = SLOT(qlabel); 1260 1261 biba_copy_effective(source, dest); 1262} 1263 1264static int 1265biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, 1266 struct label *qlabel) 1267{ 1268 struct mac_biba *a, *b; 1269 1270 a = SLOT(qlabel); 1271 b = SLOT(mlabel); 1272 1273 return (biba_equal_effective(a, b)); 1274} 1275 1276static void 1277biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, 1278 struct label *mlabel) 1279{ 1280 struct mac_biba *source, *dest; 1281 1282 source = SLOT(qlabel); 1283 dest = SLOT(mlabel); 1284 1285 /* Just use the head, since we require them all to match. */ 1286 biba_copy_effective(source, dest); 1287} 1288 1289static void 1290biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, 1291 struct label *qlabel) 1292{ 1293 1294 /* NOOP: we only accept matching labels, so no need to update */ 1295} 1296 1297static int 1298biba_kld_check_load(struct ucred *cred, struct vnode *vp, 1299 struct label *vplabel) 1300{ 1301 struct mac_biba *subj, *obj; 1302 int error; 1303 1304 if (!biba_enabled) 1305 return (0); 1306 1307 subj = SLOT(cred->cr_label); 1308 1309 error = biba_subject_privileged(subj); 1310 if (error) 1311 return (error); 1312 1313 obj = SLOT(vplabel); 1314 if (!biba_high_effective(obj)) 1315 return (EACCES); 1316 1317 return (0); 1318} 1319 1320static int 1321biba_mount_check_stat(struct ucred *cred, struct mount *mp, 1322 struct label *mplabel) 1323{ 1324 struct mac_biba *subj, *obj; 1325 1326 if (!biba_enabled) 1327 return (0); 1328 1329 subj = SLOT(cred->cr_label); 1330 obj = SLOT(mplabel); 1331 1332 if (!biba_dominate_effective(obj, subj)) 1333 return (EACCES); 1334 1335 return (0); 1336} 1337 1338static void 1339biba_mount_create(struct ucred *cred, struct mount *mp, 1340 struct label *mplabel) 1341{ 1342 struct mac_biba *source, *dest; 1343 1344 source = SLOT(cred->cr_label); 1345 dest = SLOT(mplabel); 1346 1347 biba_copy_effective(source, dest); 1348} 1349 1350static void 1351biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1352 struct mbuf *m, struct label *mlabel) 1353{ 1354 struct mac_biba *dest; 1355 1356 dest = SLOT(mlabel); 1357 1358 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1359} 1360 1361static void 1362biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1363 struct mbuf *m, struct label *mlabel) 1364{ 1365 struct mac_biba *dest; 1366 1367 dest = SLOT(mlabel); 1368 1369 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1370} 1371 1372static void 1373biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1374 struct mbuf *msend, struct label *msendlabel) 1375{ 1376 struct mac_biba *source, *dest; 1377 1378 source = SLOT(mrecvlabel); 1379 dest = SLOT(msendlabel); 1380 1381 biba_copy_effective(source, dest); 1382} 1383 1384static void 1385biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1386{ 1387 struct mac_biba *dest; 1388 1389 dest = SLOT(mlabel); 1390 1391 /* XXX: where is the label for the firewall really coming from? */ 1392 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1393} 1394 1395static void 1396biba_netinet_fragment(struct mbuf *m, struct label *mlabel, 1397 struct mbuf *frag, struct label *fraglabel) 1398{ 1399 struct mac_biba *source, *dest; 1400 1401 source = SLOT(mlabel); 1402 dest = SLOT(fraglabel); 1403 1404 biba_copy_effective(source, dest); 1405} 1406 1407static void 1408biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1409 struct mbuf *msend, struct label *msendlabel) 1410{ 1411 struct mac_biba *source, *dest; 1412 1413 source = SLOT(mrecvlabel); 1414 dest = SLOT(msendlabel); 1415 1416 biba_copy_effective(source, dest); 1417} 1418 1419static void 1420biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1421 struct mbuf *m, struct label *mlabel) 1422{ 1423 struct mac_biba *dest; 1424 1425 dest = SLOT(mlabel); 1426 1427 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1428} 1429 1430static void 1431biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1432 struct mbuf *m, struct label *mlabel) 1433{ 1434 struct mac_biba *dest; 1435 1436 dest = SLOT(mlabel); 1437 1438 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1439} 1440 1441static int 1442biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1443 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1444{ 1445 1446 if(!biba_enabled) 1447 return (0); 1448 1449 /* XXX: This will be implemented soon... */ 1450 1451 return (0); 1452} 1453 1454static int 1455biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, 1456 struct label *pplabel) 1457{ 1458 struct mac_biba *subj, *obj; 1459 1460 if (!biba_enabled) 1461 return (0); 1462 1463 subj = SLOT(cred->cr_label); 1464 obj = SLOT(pplabel); 1465 1466 if (!biba_dominate_effective(obj, subj)) 1467 return (EACCES); 1468 1469 return (0); 1470} 1471 1472static int 1473biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1474 struct label *pplabel) 1475{ 1476 struct mac_biba *subj, *obj; 1477 1478 if (!biba_enabled) 1479 return (0); 1480 1481 subj = SLOT(cred->cr_label); 1482 obj = SLOT(pplabel); 1483 1484 if (!biba_dominate_effective(obj, subj)) 1485 return (EACCES); 1486 1487 return (0); 1488} 1489 1490static int 1491biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1492 struct label *pplabel, struct label *newlabel) 1493{ 1494 struct mac_biba *subj, *obj, *new; 1495 int error; 1496 1497 new = SLOT(newlabel); 1498 subj = SLOT(cred->cr_label); 1499 obj = SLOT(pplabel); 1500 1501 /* 1502 * If there is a Biba label update for a pipe, it must be a effective 1503 * update. 1504 */ 1505 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1506 if (error) 1507 return (error); 1508 1509 /* 1510 * To perform a relabel of a pipe (Biba label or not), Biba must 1511 * authorize the relabel. 1512 */ 1513 if (!biba_effective_in_range(obj, subj)) 1514 return (EPERM); 1515 1516 /* 1517 * If the Biba label is to be changed, authorize as appropriate. 1518 */ 1519 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1520 /* 1521 * To change the Biba label on a pipe, the new pipe label 1522 * must be in the subject range. 1523 */ 1524 if (!biba_effective_in_range(new, subj)) 1525 return (EPERM); 1526 1527 /* 1528 * To change the Biba label on a pipe to be EQUAL, the 1529 * subject must have appropriate privilege. 1530 */ 1531 if (biba_contains_equal(new)) { 1532 error = biba_subject_privileged(subj); 1533 if (error) 1534 return (error); 1535 } 1536 } 1537 1538 return (0); 1539} 1540 1541static int 1542biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp, 1543 struct label *pplabel) 1544{ 1545 struct mac_biba *subj, *obj; 1546 1547 if (!biba_enabled) 1548 return (0); 1549 1550 subj = SLOT(cred->cr_label); 1551 obj = SLOT(pplabel); 1552 1553 if (!biba_dominate_effective(obj, subj)) 1554 return (EACCES); 1555 1556 return (0); 1557} 1558 1559static int 1560biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1561 struct label *pplabel) 1562{ 1563 struct mac_biba *subj, *obj; 1564 1565 if (!biba_enabled) 1566 return (0); 1567 1568 subj = SLOT(cred->cr_label); 1569 obj = SLOT(pplabel); 1570 1571 if (!biba_dominate_effective(subj, obj)) 1572 return (EACCES); 1573 1574 return (0); 1575} 1576 1577static void 1578biba_pipe_create(struct ucred *cred, struct pipepair *pp, 1579 struct label *pplabel) 1580{ 1581 struct mac_biba *source, *dest; 1582 1583 source = SLOT(cred->cr_label); 1584 dest = SLOT(pplabel); 1585 1586 biba_copy_effective(source, dest); 1587} 1588 1589static void 1590biba_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1591 struct label *pplabel, struct label *newlabel) 1592{ 1593 struct mac_biba *source, *dest; 1594 1595 source = SLOT(newlabel); 1596 dest = SLOT(pplabel); 1597 1598 biba_copy(source, dest); 1599} 1600 1601static int 1602biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks, 1603 struct label *kslabel) 1604{ 1605 struct mac_biba *subj, *obj; 1606 1607 if (!biba_enabled) 1608 return (0); 1609 1610 subj = SLOT(cred->cr_label); 1611 obj = SLOT(kslabel); 1612 1613 if (!biba_dominate_effective(subj, obj)) 1614 return (EACCES); 1615 1616 return (0); 1617} 1618 1619static int 1620biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred, 1621 struct ksem *ks, struct label *kslabel) 1622{ 1623 struct mac_biba *subj, *obj; 1624 1625 if (!biba_enabled) 1626 return (0); 1627 1628 subj = SLOT(active_cred->cr_label); 1629 obj = SLOT(kslabel); 1630 1631 if (!biba_dominate_effective(subj, obj)) 1632 return (EACCES); 1633 1634 return (0); 1635} 1636 1637static int 1638biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred, 1639 struct ksem *ks, struct label *kslabel) 1640{ 1641 struct mac_biba *subj, *obj; 1642 1643 if (!biba_enabled) 1644 return (0); 1645 1646 subj = SLOT(active_cred->cr_label); 1647 obj = SLOT(kslabel); 1648 1649 if (!biba_dominate_effective(obj, subj)) 1650 return (EACCES); 1651 1652 return (0); 1653} 1654 1655static void 1656biba_posixsem_create(struct ucred *cred, struct ksem *ks, 1657 struct label *kslabel) 1658{ 1659 struct mac_biba *source, *dest; 1660 1661 source = SLOT(cred->cr_label); 1662 dest = SLOT(kslabel); 1663 1664 biba_copy_effective(source, dest); 1665} 1666 1667/* 1668 * Some system privileges are allowed regardless of integrity grade; others 1669 * are allowed only when running with privilege with respect to the Biba 1670 * policy as they might otherwise allow bypassing of the integrity policy. 1671 */ 1672static int 1673biba_priv_check(struct ucred *cred, int priv) 1674{ 1675 struct mac_biba *subj; 1676 int error; 1677 1678 if (!biba_enabled) 1679 return (0); 1680 1681 /* 1682 * Exempt only specific privileges from the Biba integrity policy. 1683 */ 1684 switch (priv) { 1685 case PRIV_KTRACE: 1686 case PRIV_MSGBUF: 1687 1688 /* 1689 * Allow processes to manipulate basic process audit properties, and 1690 * to submit audit records. 1691 */ 1692 case PRIV_AUDIT_GETAUDIT: 1693 case PRIV_AUDIT_SETAUDIT: 1694 case PRIV_AUDIT_SUBMIT: 1695 1696 /* 1697 * Allow processes to manipulate their regular UNIX credentials. 1698 */ 1699 case PRIV_CRED_SETUID: 1700 case PRIV_CRED_SETEUID: 1701 case PRIV_CRED_SETGID: 1702 case PRIV_CRED_SETEGID: 1703 case PRIV_CRED_SETGROUPS: 1704 case PRIV_CRED_SETREUID: 1705 case PRIV_CRED_SETREGID: 1706 case PRIV_CRED_SETRESUID: 1707 case PRIV_CRED_SETRESGID: 1708 1709 /* 1710 * Allow processes to perform system monitoring. 1711 */ 1712 case PRIV_SEEOTHERGIDS: 1713 case PRIV_SEEOTHERUIDS: 1714 break; 1715 1716 /* 1717 * Allow access to general process debugging facilities. We 1718 * separately control debugging based on MAC label. 1719 */ 1720 case PRIV_DEBUG_DIFFCRED: 1721 case PRIV_DEBUG_SUGID: 1722 case PRIV_DEBUG_UNPRIV: 1723 1724 /* 1725 * Allow manipulating jails. 1726 */ 1727 case PRIV_JAIL_ATTACH: 1728 1729 /* 1730 * Allow privilege with respect to the Partition policy, but not the 1731 * Privs policy. 1732 */ 1733 case PRIV_MAC_PARTITION: 1734 1735 /* 1736 * Allow privilege with respect to process resource limits and login 1737 * context. 1738 */ 1739 case PRIV_PROC_LIMIT: 1740 case PRIV_PROC_SETLOGIN: 1741 case PRIV_PROC_SETRLIMIT: 1742 1743 /* 1744 * Allow System V and POSIX IPC privileges. 1745 */ 1746 case PRIV_IPC_READ: 1747 case PRIV_IPC_WRITE: 1748 case PRIV_IPC_ADMIN: 1749 case PRIV_IPC_MSGSIZE: 1750 case PRIV_MQ_ADMIN: 1751 1752 /* 1753 * Allow certain scheduler manipulations -- possibly this should be 1754 * controlled by more fine-grained policy, as potentially low 1755 * integrity processes can deny CPU to higher integrity ones. 1756 */ 1757 case PRIV_SCHED_DIFFCRED: 1758 case PRIV_SCHED_SETPRIORITY: 1759 case PRIV_SCHED_RTPRIO: 1760 case PRIV_SCHED_SETPOLICY: 1761 case PRIV_SCHED_SET: 1762 case PRIV_SCHED_SETPARAM: 1763 1764 /* 1765 * More IPC privileges. 1766 */ 1767 case PRIV_SEM_WRITE: 1768 1769 /* 1770 * Allow signaling privileges subject to integrity policy. 1771 */ 1772 case PRIV_SIGNAL_DIFFCRED: 1773 case PRIV_SIGNAL_SUGID: 1774 1775 /* 1776 * Allow access to only limited sysctls from lower integrity levels; 1777 * piggy-back on the Jail definition. 1778 */ 1779 case PRIV_SYSCTL_WRITEJAIL: 1780 1781 /* 1782 * Allow TTY-based privileges, subject to general device access using 1783 * labels on TTY device nodes, but not console privilege. 1784 */ 1785 case PRIV_TTY_DRAINWAIT: 1786 case PRIV_TTY_DTRWAIT: 1787 case PRIV_TTY_EXCLUSIVE: 1788 case PRIV_TTY_PRISON: 1789 case PRIV_TTY_STI: 1790 case PRIV_TTY_SETA: 1791 1792 /* 1793 * Grant most VFS privileges, as almost all are in practice bounded 1794 * by more specific checks using labels. 1795 */ 1796 case PRIV_VFS_READ: 1797 case PRIV_VFS_WRITE: 1798 case PRIV_VFS_ADMIN: 1799 case PRIV_VFS_EXEC: 1800 case PRIV_VFS_LOOKUP: 1801 case PRIV_VFS_CHFLAGS_DEV: 1802 case PRIV_VFS_CHOWN: 1803 case PRIV_VFS_CHROOT: 1804 case PRIV_VFS_RETAINSUGID: 1805 case PRIV_VFS_EXCEEDQUOTA: 1806 case PRIV_VFS_FCHROOT: 1807 case PRIV_VFS_FHOPEN: 1808 case PRIV_VFS_FHSTATFS: 1809 case PRIV_VFS_GENERATION: 1810 case PRIV_VFS_GETFH: 1811 case PRIV_VFS_GETQUOTA: 1812 case PRIV_VFS_LINK: 1813 case PRIV_VFS_MOUNT: 1814 case PRIV_VFS_MOUNT_OWNER: 1815 case PRIV_VFS_MOUNT_PERM: 1816 case PRIV_VFS_MOUNT_SUIDDIR: 1817 case PRIV_VFS_MOUNT_NONUSER: 1818 case PRIV_VFS_SETGID: 1819 case PRIV_VFS_STICKYFILE: 1820 case PRIV_VFS_SYSFLAGS: 1821 case PRIV_VFS_UNMOUNT: 1822 1823 /* 1824 * Allow VM privileges; it would be nice if these were subject to 1825 * resource limits. 1826 */ 1827 case PRIV_VM_MADV_PROTECT: 1828 case PRIV_VM_MLOCK: 1829 case PRIV_VM_MUNLOCK: 1830 1831 /* 1832 * Allow some but not all network privileges. In general, dont allow 1833 * reconfiguring the network stack, just normal use. 1834 */ 1835 case PRIV_NETATALK_RESERVEDPORT: 1836 case PRIV_NETINET_RESERVEDPORT: 1837 case PRIV_NETINET_RAW: 1838 case PRIV_NETINET_REUSEPORT: 1839 case PRIV_NETIPX_RESERVEDPORT: 1840 case PRIV_NETIPX_RAW: 1841 break; 1842 1843 /* 1844 * All remaining system privileges are allow only if the process 1845 * holds privilege with respect to the Biba policy. 1846 */ 1847 default: 1848 subj = SLOT(cred->cr_label); 1849 error = biba_subject_privileged(subj); 1850 if (error) 1851 return (error); 1852 } 1853 return (0); 1854} 1855 1856static int 1857biba_proc_check_debug(struct ucred *cred, struct proc *p) 1858{ 1859 struct mac_biba *subj, *obj; 1860 1861 if (!biba_enabled) 1862 return (0); 1863 1864 subj = SLOT(cred->cr_label); 1865 obj = SLOT(p->p_ucred->cr_label); 1866 1867 /* XXX: range checks */ 1868 if (!biba_dominate_effective(obj, subj)) 1869 return (ESRCH); 1870 if (!biba_dominate_effective(subj, obj)) 1871 return (EACCES); 1872 1873 return (0); 1874} 1875 1876static int 1877biba_proc_check_sched(struct ucred *cred, struct proc *p) 1878{ 1879 struct mac_biba *subj, *obj; 1880 1881 if (!biba_enabled) 1882 return (0); 1883 1884 subj = SLOT(cred->cr_label); 1885 obj = SLOT(p->p_ucred->cr_label); 1886 1887 /* XXX: range checks */ 1888 if (!biba_dominate_effective(obj, subj)) 1889 return (ESRCH); 1890 if (!biba_dominate_effective(subj, obj)) 1891 return (EACCES); 1892 1893 return (0); 1894} 1895 1896static int 1897biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1898{ 1899 struct mac_biba *subj, *obj; 1900 1901 if (!biba_enabled) 1902 return (0); 1903 1904 subj = SLOT(cred->cr_label); 1905 obj = SLOT(p->p_ucred->cr_label); 1906 1907 /* XXX: range checks */ 1908 if (!biba_dominate_effective(obj, subj)) 1909 return (ESRCH); 1910 if (!biba_dominate_effective(subj, obj)) 1911 return (EACCES); 1912 1913 return (0); 1914} 1915 1916static int 1917biba_socket_check_deliver(struct socket *so, struct label *solabel, 1918 struct mbuf *m, struct label *mlabel) 1919{ 1920 struct mac_biba *p, *s; 1921 1922 if (!biba_enabled) 1923 return (0); 1924 1925 p = SLOT(mlabel); 1926 s = SLOT(solabel); 1927 1928 return (biba_equal_effective(p, s) ? 0 : EACCES); 1929} 1930 1931static int 1932biba_socket_check_relabel(struct ucred *cred, struct socket *so, 1933 struct label *solabel, struct label *newlabel) 1934{ 1935 struct mac_biba *subj, *obj, *new; 1936 int error; 1937 1938 new = SLOT(newlabel); 1939 subj = SLOT(cred->cr_label); 1940 obj = SLOT(solabel); 1941 1942 /* 1943 * If there is a Biba label update for the socket, it may be an 1944 * update of effective. 1945 */ 1946 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1947 if (error) 1948 return (error); 1949 1950 /* 1951 * To relabel a socket, the old socket effective must be in the 1952 * subject range. 1953 */ 1954 if (!biba_effective_in_range(obj, subj)) 1955 return (EPERM); 1956 1957 /* 1958 * If the Biba label is to be changed, authorize as appropriate. 1959 */ 1960 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 1961 /* 1962 * To relabel a socket, the new socket effective must be in 1963 * the subject range. 1964 */ 1965 if (!biba_effective_in_range(new, subj)) 1966 return (EPERM); 1967 1968 /* 1969 * To change the Biba label on the socket to contain EQUAL, 1970 * the subject must have appropriate privilege. 1971 */ 1972 if (biba_contains_equal(new)) { 1973 error = biba_subject_privileged(subj); 1974 if (error) 1975 return (error); 1976 } 1977 } 1978 1979 return (0); 1980} 1981 1982static int 1983biba_socket_check_visible(struct ucred *cred, struct socket *so, 1984 struct label *solabel) 1985{ 1986 struct mac_biba *subj, *obj; 1987 1988 if (!biba_enabled) 1989 return (0); 1990 1991 subj = SLOT(cred->cr_label); 1992 obj = SLOT(solabel); 1993 1994 if (!biba_dominate_effective(obj, subj)) 1995 return (ENOENT); 1996 1997 return (0); 1998} 1999 2000static void 2001biba_socket_create(struct ucred *cred, struct socket *so, 2002 struct label *solabel) 2003{ 2004 struct mac_biba *source, *dest; 2005 2006 source = SLOT(cred->cr_label); 2007 dest = SLOT(solabel); 2008 2009 biba_copy_effective(source, dest); 2010} 2011 2012static void 2013biba_socket_create_mbuf(struct socket *so, struct label *solabel, 2014 struct mbuf *m, struct label *mlabel) 2015{ 2016 struct mac_biba *source, *dest; 2017 2018 source = SLOT(solabel); 2019 dest = SLOT(mlabel); 2020 2021 biba_copy_effective(source, dest); 2022} 2023 2024static void 2025biba_socket_newconn(struct socket *oldso, struct label *oldsolabel, 2026 struct socket *newso, struct label *newsolabel) 2027{ 2028 struct mac_biba *source, *dest; 2029 2030 source = SLOT(oldsolabel); 2031 dest = SLOT(newsolabel); 2032 2033 biba_copy_effective(source, dest); 2034} 2035 2036static void 2037biba_socket_relabel(struct ucred *cred, struct socket *so, 2038 struct label *solabel, struct label *newlabel) 2039{ 2040 struct mac_biba *source, *dest; 2041 2042 source = SLOT(newlabel); 2043 dest = SLOT(solabel); 2044 2045 biba_copy(source, dest); 2046} 2047 2048static void 2049biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 2050 struct socket *so, struct label *sopeerlabel) 2051{ 2052 struct mac_biba *source, *dest; 2053 2054 source = SLOT(mlabel); 2055 dest = SLOT(sopeerlabel); 2056 2057 biba_copy_effective(source, dest); 2058} 2059 2060static void 2061biba_socketpeer_set_from_socket(struct socket *oldso, 2062 struct label *oldsolabel, struct socket *newso, 2063 struct label *newsopeerlabel) 2064{ 2065 struct mac_biba *source, *dest; 2066 2067 source = SLOT(oldsolabel); 2068 dest = SLOT(newsopeerlabel); 2069 2070 biba_copy_effective(source, dest); 2071} 2072 2073static void 2074biba_syncache_create(struct label *label, struct inpcb *inp) 2075{ 2076 struct mac_biba *source, *dest; 2077 2078 source = SLOT(inp->inp_label); 2079 dest = SLOT(label); 2080 biba_copy_effective(source, dest); 2081} 2082 2083static void 2084biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2085 struct label *mlabel) 2086{ 2087 struct mac_biba *source, *dest; 2088 2089 source = SLOT(sc_label); 2090 dest = SLOT(mlabel); 2091 biba_copy_effective(source, dest); 2092} 2093 2094static int 2095biba_system_check_acct(struct ucred *cred, struct vnode *vp, 2096 struct label *vplabel) 2097{ 2098 struct mac_biba *subj, *obj; 2099 int error; 2100 2101 if (!biba_enabled) 2102 return (0); 2103 2104 subj = SLOT(cred->cr_label); 2105 2106 error = biba_subject_privileged(subj); 2107 if (error) 2108 return (error); 2109 2110 if (vplabel == NULL) 2111 return (0); 2112 2113 obj = SLOT(vplabel); 2114 if (!biba_high_effective(obj)) 2115 return (EACCES); 2116 2117 return (0); 2118} 2119 2120static int 2121biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2122 struct label *vplabel) 2123{ 2124 struct mac_biba *subj, *obj; 2125 int error; 2126 2127 if (!biba_enabled) 2128 return (0); 2129 2130 subj = SLOT(cred->cr_label); 2131 2132 error = biba_subject_privileged(subj); 2133 if (error) 2134 return (error); 2135 2136 if (vplabel == NULL) 2137 return (0); 2138 2139 obj = SLOT(vplabel); 2140 if (!biba_high_effective(obj)) 2141 return (EACCES); 2142 2143 return (0); 2144} 2145 2146static int 2147biba_system_check_auditon(struct ucred *cred, int cmd) 2148{ 2149 struct mac_biba *subj; 2150 int error; 2151 2152 if (!biba_enabled) 2153 return (0); 2154 2155 subj = SLOT(cred->cr_label); 2156 2157 error = biba_subject_privileged(subj); 2158 if (error) 2159 return (error); 2160 2161 return (0); 2162} 2163 2164static int 2165biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2166 struct label *label) 2167{ 2168 struct mac_biba *subj; 2169 int error; 2170 2171 if (!biba_enabled) 2172 return (0); 2173 2174 subj = SLOT(cred->cr_label); 2175 2176 error = biba_subject_privileged(subj); 2177 if (error) 2178 return (error); 2179 2180 return (0); 2181} 2182 2183static int 2184biba_system_check_swapon(struct ucred *cred, struct vnode *vp, 2185 struct label *vplabel) 2186{ 2187 struct mac_biba *subj, *obj; 2188 int error; 2189 2190 if (!biba_enabled) 2191 return (0); 2192 2193 subj = SLOT(cred->cr_label); 2194 obj = SLOT(vplabel); 2195 2196 error = biba_subject_privileged(subj); 2197 if (error) 2198 return (error); 2199 2200 if (!biba_high_effective(obj)) 2201 return (EACCES); 2202 2203 return (0); 2204} 2205 2206static int 2207biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2208 void *arg1, int arg2, struct sysctl_req *req) 2209{ 2210 struct mac_biba *subj; 2211 int error; 2212 2213 if (!biba_enabled) 2214 return (0); 2215 2216 subj = SLOT(cred->cr_label); 2217 2218 /* 2219 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, 2220 * but also require privilege to change them. 2221 */ 2222 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2223 if (!biba_subject_dominate_high(subj)) 2224 return (EACCES); 2225 2226 error = biba_subject_privileged(subj); 2227 if (error) 2228 return (error); 2229 } 2230 2231 return (0); 2232} 2233 2234static void 2235biba_sysvmsg_cleanup(struct label *msglabel) 2236{ 2237 2238 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 2239} 2240 2241static void 2242biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2243 struct label *msqlabel, struct msg *msgptr, struct label *msglabel) 2244{ 2245 struct mac_biba *source, *dest; 2246 2247 /* Ignore the msgq label */ 2248 source = SLOT(cred->cr_label); 2249 dest = SLOT(msglabel); 2250 2251 biba_copy_effective(source, dest); 2252} 2253 2254static int 2255biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, 2256 struct label *msglabel) 2257{ 2258 struct mac_biba *subj, *obj; 2259 2260 if (!biba_enabled) 2261 return (0); 2262 2263 subj = SLOT(cred->cr_label); 2264 obj = SLOT(msglabel); 2265 2266 if (!biba_dominate_effective(obj, subj)) 2267 return (EACCES); 2268 2269 return (0); 2270} 2271 2272static int 2273biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, 2274 struct label *msglabel) 2275{ 2276 struct mac_biba *subj, *obj; 2277 2278 if (!biba_enabled) 2279 return (0); 2280 2281 subj = SLOT(cred->cr_label); 2282 obj = SLOT(msglabel); 2283 2284 if (!biba_dominate_effective(subj, obj)) 2285 return (EACCES); 2286 2287 return (0); 2288} 2289 2290static int 2291biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 2292 struct label *msqklabel) 2293{ 2294 struct mac_biba *subj, *obj; 2295 2296 if (!biba_enabled) 2297 return (0); 2298 2299 subj = SLOT(cred->cr_label); 2300 obj = SLOT(msqklabel); 2301 2302 if (!biba_dominate_effective(obj, subj)) 2303 return (EACCES); 2304 2305 return (0); 2306} 2307 2308static int 2309biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 2310 struct label *msqklabel) 2311{ 2312 struct mac_biba *subj, *obj; 2313 2314 if (!biba_enabled) 2315 return (0); 2316 2317 subj = SLOT(cred->cr_label); 2318 obj = SLOT(msqklabel); 2319 2320 if (!biba_dominate_effective(subj, obj)) 2321 return (EACCES); 2322 2323 return (0); 2324} 2325 2326static int 2327biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 2328 struct label *msqklabel) 2329{ 2330 struct mac_biba *subj, *obj; 2331 2332 if (!biba_enabled) 2333 return (0); 2334 2335 subj = SLOT(cred->cr_label); 2336 obj = SLOT(msqklabel); 2337 2338 if (!biba_dominate_effective(obj, subj)) 2339 return (EACCES); 2340 2341 return (0); 2342} 2343 2344static int 2345biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 2346 struct label *msqklabel, int cmd) 2347{ 2348 struct mac_biba *subj, *obj; 2349 2350 if (!biba_enabled) 2351 return (0); 2352 2353 subj = SLOT(cred->cr_label); 2354 obj = SLOT(msqklabel); 2355 2356 switch(cmd) { 2357 case IPC_RMID: 2358 case IPC_SET: 2359 if (!biba_dominate_effective(subj, obj)) 2360 return (EACCES); 2361 break; 2362 2363 case IPC_STAT: 2364 if (!biba_dominate_effective(obj, subj)) 2365 return (EACCES); 2366 break; 2367 2368 default: 2369 return (EACCES); 2370 } 2371 2372 return (0); 2373} 2374 2375static void 2376biba_sysvmsq_cleanup(struct label *msqlabel) 2377{ 2378 2379 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 2380} 2381 2382static void 2383biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr, 2384 struct label *msqlabel) 2385{ 2386 struct mac_biba *source, *dest; 2387 2388 source = SLOT(cred->cr_label); 2389 dest = SLOT(msqlabel); 2390 2391 biba_copy_effective(source, dest); 2392} 2393 2394static int 2395biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 2396 struct label *semaklabel, int cmd) 2397{ 2398 struct mac_biba *subj, *obj; 2399 2400 if (!biba_enabled) 2401 return (0); 2402 2403 subj = SLOT(cred->cr_label); 2404 obj = SLOT(semaklabel); 2405 2406 switch(cmd) { 2407 case IPC_RMID: 2408 case IPC_SET: 2409 case SETVAL: 2410 case SETALL: 2411 if (!biba_dominate_effective(subj, obj)) 2412 return (EACCES); 2413 break; 2414 2415 case IPC_STAT: 2416 case GETVAL: 2417 case GETPID: 2418 case GETNCNT: 2419 case GETZCNT: 2420 case GETALL: 2421 if (!biba_dominate_effective(obj, subj)) 2422 return (EACCES); 2423 break; 2424 2425 default: 2426 return (EACCES); 2427 } 2428 2429 return (0); 2430} 2431 2432static int 2433biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, 2434 struct label *semaklabel) 2435{ 2436 struct mac_biba *subj, *obj; 2437 2438 if (!biba_enabled) 2439 return (0); 2440 2441 subj = SLOT(cred->cr_label); 2442 obj = SLOT(semaklabel); 2443 2444 if (!biba_dominate_effective(obj, subj)) 2445 return (EACCES); 2446 2447 return (0); 2448} 2449 2450static int 2451biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 2452 struct label *semaklabel, size_t accesstype) 2453{ 2454 struct mac_biba *subj, *obj; 2455 2456 if (!biba_enabled) 2457 return (0); 2458 2459 subj = SLOT(cred->cr_label); 2460 obj = SLOT(semaklabel); 2461 2462 if (accesstype & SEM_R) 2463 if (!biba_dominate_effective(obj, subj)) 2464 return (EACCES); 2465 2466 if (accesstype & SEM_A) 2467 if (!biba_dominate_effective(subj, obj)) 2468 return (EACCES); 2469 2470 return (0); 2471} 2472 2473static void 2474biba_sysvsem_cleanup(struct label *semalabel) 2475{ 2476 2477 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 2478} 2479 2480static void 2481biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr, 2482 struct label *semalabel) 2483{ 2484 struct mac_biba *source, *dest; 2485 2486 source = SLOT(cred->cr_label); 2487 dest = SLOT(semalabel); 2488 2489 biba_copy_effective(source, dest); 2490} 2491 2492static int 2493biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 2494 struct label *shmseglabel, int shmflg) 2495{ 2496 struct mac_biba *subj, *obj; 2497 2498 if (!biba_enabled) 2499 return (0); 2500 2501 subj = SLOT(cred->cr_label); 2502 obj = SLOT(shmseglabel); 2503 2504 if (!biba_dominate_effective(obj, subj)) 2505 return (EACCES); 2506 if ((shmflg & SHM_RDONLY) == 0) { 2507 if (!biba_dominate_effective(subj, obj)) 2508 return (EACCES); 2509 } 2510 2511 return (0); 2512} 2513 2514static int 2515biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 2516 struct label *shmseglabel, int cmd) 2517{ 2518 struct mac_biba *subj, *obj; 2519 2520 if (!biba_enabled) 2521 return (0); 2522 2523 subj = SLOT(cred->cr_label); 2524 obj = SLOT(shmseglabel); 2525 2526 switch(cmd) { 2527 case IPC_RMID: 2528 case IPC_SET: 2529 if (!biba_dominate_effective(subj, obj)) 2530 return (EACCES); 2531 break; 2532 2533 case IPC_STAT: 2534 case SHM_STAT: 2535 if (!biba_dominate_effective(obj, subj)) 2536 return (EACCES); 2537 break; 2538 2539 default: 2540 return (EACCES); 2541 } 2542 2543 return (0); 2544} 2545 2546static int 2547biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 2548 struct label *shmseglabel, int shmflg) 2549{ 2550 struct mac_biba *subj, *obj; 2551 2552 if (!biba_enabled) 2553 return (0); 2554 2555 subj = SLOT(cred->cr_label); 2556 obj = SLOT(shmseglabel); 2557 2558 if (!biba_dominate_effective(obj, subj)) 2559 return (EACCES); 2560 2561 return (0); 2562} 2563 2564static void 2565biba_sysvshm_cleanup(struct label *shmlabel) 2566{ 2567 2568 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 2569} 2570 2571static void 2572biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr, 2573 struct label *shmlabel) 2574{ 2575 struct mac_biba *source, *dest; 2576 2577 source = SLOT(cred->cr_label); 2578 dest = SLOT(shmlabel); 2579 2580 biba_copy_effective(source, dest); 2581} 2582 2583static int 2584biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2585 struct vnode *vp, struct label *vplabel) 2586{ 2587 struct mac_biba mb_temp, *source, *dest; 2588 int buflen, error; 2589 2590 source = SLOT(mplabel); 2591 dest = SLOT(vplabel); 2592 2593 buflen = sizeof(mb_temp); 2594 bzero(&mb_temp, buflen); 2595 2596 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 2597 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread); 2598 if (error == ENOATTR || error == EOPNOTSUPP) { 2599 /* Fall back to the mntlabel. */ 2600 biba_copy_effective(source, dest); 2601 return (0); 2602 } else if (error) 2603 return (error); 2604 2605 if (buflen != sizeof(mb_temp)) { 2606 printf("biba_vnode_associate_extattr: bad size %d\n", 2607 buflen); 2608 return (EPERM); 2609 } 2610 if (biba_valid(&mb_temp) != 0) { 2611 printf("biba_vnode_associate_extattr: invalid\n"); 2612 return (EPERM); 2613 } 2614 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != 2615 MAC_BIBA_FLAG_EFFECTIVE) { 2616 printf("biba_vnode_associate_extattr: not effective\n"); 2617 return (EPERM); 2618 } 2619 2620 biba_copy_effective(&mb_temp, dest); 2621 return (0); 2622} 2623 2624static void 2625biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2626 struct vnode *vp, struct label *vplabel) 2627{ 2628 struct mac_biba *source, *dest; 2629 2630 source = SLOT(mplabel); 2631 dest = SLOT(vplabel); 2632 2633 biba_copy_effective(source, dest); 2634} 2635 2636static int 2637biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, 2638 struct label *dvplabel) 2639{ 2640 struct mac_biba *subj, *obj; 2641 2642 if (!biba_enabled) 2643 return (0); 2644 2645 subj = SLOT(cred->cr_label); 2646 obj = SLOT(dvplabel); 2647 2648 if (!biba_dominate_effective(obj, subj)) 2649 return (EACCES); 2650 2651 return (0); 2652} 2653 2654static int 2655biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, 2656 struct label *dvplabel) 2657{ 2658 struct mac_biba *subj, *obj; 2659 2660 if (!biba_enabled) 2661 return (0); 2662 2663 subj = SLOT(cred->cr_label); 2664 obj = SLOT(dvplabel); 2665 2666 if (!biba_dominate_effective(obj, subj)) 2667 return (EACCES); 2668 2669 return (0); 2670} 2671 2672static int 2673biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2674 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2675{ 2676 struct mac_biba *subj, *obj; 2677 2678 if (!biba_enabled) 2679 return (0); 2680 2681 subj = SLOT(cred->cr_label); 2682 obj = SLOT(dvplabel); 2683 2684 if (!biba_dominate_effective(subj, obj)) 2685 return (EACCES); 2686 2687 return (0); 2688} 2689 2690static int 2691biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2692 struct label *vplabel, acl_type_t type) 2693{ 2694 struct mac_biba *subj, *obj; 2695 2696 if (!biba_enabled) 2697 return (0); 2698 2699 subj = SLOT(cred->cr_label); 2700 obj = SLOT(vplabel); 2701 2702 if (!biba_dominate_effective(subj, obj)) 2703 return (EACCES); 2704 2705 return (0); 2706} 2707 2708static int 2709biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 2710 struct label *vplabel, int attrnamespace, const char *name) 2711{ 2712 struct mac_biba *subj, *obj; 2713 2714 if (!biba_enabled) 2715 return (0); 2716 2717 subj = SLOT(cred->cr_label); 2718 obj = SLOT(vplabel); 2719 2720 if (!biba_dominate_effective(subj, obj)) 2721 return (EACCES); 2722 2723 return (0); 2724} 2725 2726static int 2727biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, 2728 struct label *vplabel, struct image_params *imgp, 2729 struct label *execlabel) 2730{ 2731 struct mac_biba *subj, *obj, *exec; 2732 int error; 2733 2734 if (execlabel != NULL) { 2735 /* 2736 * We currently don't permit labels to be changed at 2737 * exec-time as part of Biba, so disallow non-NULL Biba label 2738 * elements in the execlabel. 2739 */ 2740 exec = SLOT(execlabel); 2741 error = biba_atmostflags(exec, 0); 2742 if (error) 2743 return (error); 2744 } 2745 2746 if (!biba_enabled) 2747 return (0); 2748 2749 subj = SLOT(cred->cr_label); 2750 obj = SLOT(vplabel); 2751 2752 if (!biba_dominate_effective(obj, subj)) 2753 return (EACCES); 2754 2755 return (0); 2756} 2757 2758static int 2759biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, 2760 struct label *vplabel, acl_type_t type) 2761{ 2762 struct mac_biba *subj, *obj; 2763 2764 if (!biba_enabled) 2765 return (0); 2766 2767 subj = SLOT(cred->cr_label); 2768 obj = SLOT(vplabel); 2769 2770 if (!biba_dominate_effective(obj, subj)) 2771 return (EACCES); 2772 2773 return (0); 2774} 2775 2776static int 2777biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, 2778 struct label *vplabel, int attrnamespace, const char *name, 2779 struct uio *uio) 2780{ 2781 struct mac_biba *subj, *obj; 2782 2783 if (!biba_enabled) 2784 return (0); 2785 2786 subj = SLOT(cred->cr_label); 2787 obj = SLOT(vplabel); 2788 2789 if (!biba_dominate_effective(obj, subj)) 2790 return (EACCES); 2791 2792 return (0); 2793} 2794 2795static int 2796biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2797 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2798 struct componentname *cnp) 2799{ 2800 struct mac_biba *subj, *obj; 2801 2802 if (!biba_enabled) 2803 return (0); 2804 2805 subj = SLOT(cred->cr_label); 2806 obj = SLOT(dvplabel); 2807 2808 if (!biba_dominate_effective(subj, obj)) 2809 return (EACCES); 2810 2811 obj = SLOT(vplabel); 2812 2813 if (!biba_dominate_effective(subj, obj)) 2814 return (EACCES); 2815 2816 return (0); 2817} 2818 2819static int 2820biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, 2821 struct label *vplabel, int attrnamespace) 2822{ 2823 struct mac_biba *subj, *obj; 2824 2825 if (!biba_enabled) 2826 return (0); 2827 2828 subj = SLOT(cred->cr_label); 2829 obj = SLOT(vplabel); 2830 2831 if (!biba_dominate_effective(obj, subj)) 2832 return (EACCES); 2833 2834 return (0); 2835} 2836 2837static int 2838biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, 2839 struct label *dvplabel, struct componentname *cnp) 2840{ 2841 struct mac_biba *subj, *obj; 2842 2843 if (!biba_enabled) 2844 return (0); 2845 2846 subj = SLOT(cred->cr_label); 2847 obj = SLOT(dvplabel); 2848 2849 if (!biba_dominate_effective(obj, subj)) 2850 return (EACCES); 2851 2852 return (0); 2853} 2854 2855static int 2856biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2857 struct label *vplabel, int prot, int flags) 2858{ 2859 struct mac_biba *subj, *obj; 2860 2861 /* 2862 * Rely on the use of open()-time protections to handle 2863 * non-revocation cases. 2864 */ 2865 if (!biba_enabled || !revocation_enabled) 2866 return (0); 2867 2868 subj = SLOT(cred->cr_label); 2869 obj = SLOT(vplabel); 2870 2871 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2872 if (!biba_dominate_effective(obj, subj)) 2873 return (EACCES); 2874 } 2875 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2876 if (!biba_dominate_effective(subj, obj)) 2877 return (EACCES); 2878 } 2879 2880 return (0); 2881} 2882 2883static int 2884biba_vnode_check_open(struct ucred *cred, struct vnode *vp, 2885 struct label *vplabel, accmode_t accmode) 2886{ 2887 struct mac_biba *subj, *obj; 2888 2889 if (!biba_enabled) 2890 return (0); 2891 2892 subj = SLOT(cred->cr_label); 2893 obj = SLOT(vplabel); 2894 2895 /* XXX privilege override for admin? */ 2896 if (accmode & (VREAD | VEXEC | VSTAT)) { 2897 if (!biba_dominate_effective(obj, subj)) 2898 return (EACCES); 2899 } 2900 if (accmode & (VWRITE | VAPPEND | VADMIN)) { 2901 if (!biba_dominate_effective(subj, obj)) 2902 return (EACCES); 2903 } 2904 2905 return (0); 2906} 2907 2908static int 2909biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, 2910 struct vnode *vp, struct label *vplabel) 2911{ 2912 struct mac_biba *subj, *obj; 2913 2914 if (!biba_enabled || !revocation_enabled) 2915 return (0); 2916 2917 subj = SLOT(active_cred->cr_label); 2918 obj = SLOT(vplabel); 2919 2920 if (!biba_dominate_effective(obj, subj)) 2921 return (EACCES); 2922 2923 return (0); 2924} 2925 2926static int 2927biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2928 struct vnode *vp, struct label *vplabel) 2929{ 2930 struct mac_biba *subj, *obj; 2931 2932 if (!biba_enabled || !revocation_enabled) 2933 return (0); 2934 2935 subj = SLOT(active_cred->cr_label); 2936 obj = SLOT(vplabel); 2937 2938 if (!biba_dominate_effective(obj, subj)) 2939 return (EACCES); 2940 2941 return (0); 2942} 2943 2944static int 2945biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, 2946 struct label *dvplabel) 2947{ 2948 struct mac_biba *subj, *obj; 2949 2950 if (!biba_enabled) 2951 return (0); 2952 2953 subj = SLOT(cred->cr_label); 2954 obj = SLOT(dvplabel); 2955 2956 if (!biba_dominate_effective(obj, subj)) 2957 return (EACCES); 2958 2959 return (0); 2960} 2961 2962static int 2963biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, 2964 struct label *vplabel) 2965{ 2966 struct mac_biba *subj, *obj; 2967 2968 if (!biba_enabled) 2969 return (0); 2970 2971 subj = SLOT(cred->cr_label); 2972 obj = SLOT(vplabel); 2973 2974 if (!biba_dominate_effective(obj, subj)) 2975 return (EACCES); 2976 2977 return (0); 2978} 2979 2980static int 2981biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2982 struct label *vplabel, struct label *newlabel) 2983{ 2984 struct mac_biba *old, *new, *subj; 2985 int error; 2986 2987 old = SLOT(vplabel); 2988 new = SLOT(newlabel); 2989 subj = SLOT(cred->cr_label); 2990 2991 /* 2992 * If there is a Biba label update for the vnode, it must be a 2993 * effective label. 2994 */ 2995 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2996 if (error) 2997 return (error); 2998 2999 /* 3000 * To perform a relabel of the vnode (Biba label or not), Biba must 3001 * authorize the relabel. 3002 */ 3003 if (!biba_effective_in_range(old, subj)) 3004 return (EPERM); 3005 3006 /* 3007 * If the Biba label is to be changed, authorize as appropriate. 3008 */ 3009 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 3010 /* 3011 * To change the Biba label on a vnode, the new vnode label 3012 * must be in the subject range. 3013 */ 3014 if (!biba_effective_in_range(new, subj)) 3015 return (EPERM); 3016 3017 /* 3018 * To change the Biba label on the vnode to be EQUAL, the 3019 * subject must have appropriate privilege. 3020 */ 3021 if (biba_contains_equal(new)) { 3022 error = biba_subject_privileged(subj); 3023 if (error) 3024 return (error); 3025 } 3026 } 3027 3028 return (0); 3029} 3030 3031static int 3032biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 3033 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3034 struct componentname *cnp) 3035{ 3036 struct mac_biba *subj, *obj; 3037 3038 if (!biba_enabled) 3039 return (0); 3040 3041 subj = SLOT(cred->cr_label); 3042 obj = SLOT(dvplabel); 3043 3044 if (!biba_dominate_effective(subj, obj)) 3045 return (EACCES); 3046 3047 obj = SLOT(vplabel); 3048 3049 if (!biba_dominate_effective(subj, obj)) 3050 return (EACCES); 3051 3052 return (0); 3053} 3054 3055static int 3056biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 3057 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3058 int samedir, struct componentname *cnp) 3059{ 3060 struct mac_biba *subj, *obj; 3061 3062 if (!biba_enabled) 3063 return (0); 3064 3065 subj = SLOT(cred->cr_label); 3066 obj = SLOT(dvplabel); 3067 3068 if (!biba_dominate_effective(subj, obj)) 3069 return (EACCES); 3070 3071 if (vp != NULL) { 3072 obj = SLOT(vplabel); 3073 3074 if (!biba_dominate_effective(subj, obj)) 3075 return (EACCES); 3076 } 3077 3078 return (0); 3079} 3080 3081static int 3082biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 3083 struct label *vplabel) 3084{ 3085 struct mac_biba *subj, *obj; 3086 3087 if (!biba_enabled) 3088 return (0); 3089 3090 subj = SLOT(cred->cr_label); 3091 obj = SLOT(vplabel); 3092 3093 if (!biba_dominate_effective(subj, obj)) 3094 return (EACCES); 3095 3096 return (0); 3097} 3098 3099static int 3100biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 3101 struct label *vplabel, acl_type_t type, struct acl *acl) 3102{ 3103 struct mac_biba *subj, *obj; 3104 3105 if (!biba_enabled) 3106 return (0); 3107 3108 subj = SLOT(cred->cr_label); 3109 obj = SLOT(vplabel); 3110 3111 if (!biba_dominate_effective(subj, obj)) 3112 return (EACCES); 3113 3114 return (0); 3115} 3116 3117static int 3118biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 3119 struct label *vplabel, int attrnamespace, const char *name, 3120 struct uio *uio) 3121{ 3122 struct mac_biba *subj, *obj; 3123 3124 if (!biba_enabled) 3125 return (0); 3126 3127 subj = SLOT(cred->cr_label); 3128 obj = SLOT(vplabel); 3129 3130 if (!biba_dominate_effective(subj, obj)) 3131 return (EACCES); 3132 3133 /* XXX: protect the MAC EA in a special way? */ 3134 3135 return (0); 3136} 3137 3138static int 3139biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 3140 struct label *vplabel, u_long flags) 3141{ 3142 struct mac_biba *subj, *obj; 3143 3144 if (!biba_enabled) 3145 return (0); 3146 3147 subj = SLOT(cred->cr_label); 3148 obj = SLOT(vplabel); 3149 3150 if (!biba_dominate_effective(subj, obj)) 3151 return (EACCES); 3152 3153 return (0); 3154} 3155 3156static int 3157biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 3158 struct label *vplabel, mode_t mode) 3159{ 3160 struct mac_biba *subj, *obj; 3161 3162 if (!biba_enabled) 3163 return (0); 3164 3165 subj = SLOT(cred->cr_label); 3166 obj = SLOT(vplabel); 3167 3168 if (!biba_dominate_effective(subj, obj)) 3169 return (EACCES); 3170 3171 return (0); 3172} 3173 3174static int 3175biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 3176 struct label *vplabel, uid_t uid, gid_t gid) 3177{ 3178 struct mac_biba *subj, *obj; 3179 3180 if (!biba_enabled) 3181 return (0); 3182 3183 subj = SLOT(cred->cr_label); 3184 obj = SLOT(vplabel); 3185 3186 if (!biba_dominate_effective(subj, obj)) 3187 return (EACCES); 3188 3189 return (0); 3190} 3191 3192static int 3193biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 3194 struct label *vplabel, struct timespec atime, struct timespec mtime) 3195{ 3196 struct mac_biba *subj, *obj; 3197 3198 if (!biba_enabled) 3199 return (0); 3200 3201 subj = SLOT(cred->cr_label); 3202 obj = SLOT(vplabel); 3203 3204 if (!biba_dominate_effective(subj, obj)) 3205 return (EACCES); 3206 3207 return (0); 3208} 3209 3210static int 3211biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, 3212 struct vnode *vp, struct label *vplabel) 3213{ 3214 struct mac_biba *subj, *obj; 3215 3216 if (!biba_enabled) 3217 return (0); 3218 3219 subj = SLOT(active_cred->cr_label); 3220 obj = SLOT(vplabel); 3221 3222 if (!biba_dominate_effective(obj, subj)) 3223 return (EACCES); 3224 3225 return (0); 3226} 3227 3228static int 3229biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 3230 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3231 struct componentname *cnp) 3232{ 3233 struct mac_biba *subj, *obj; 3234 3235 if (!biba_enabled) 3236 return (0); 3237 3238 subj = SLOT(cred->cr_label); 3239 obj = SLOT(dvplabel); 3240 3241 if (!biba_dominate_effective(subj, obj)) 3242 return (EACCES); 3243 3244 obj = SLOT(vplabel); 3245 3246 if (!biba_dominate_effective(subj, obj)) 3247 return (EACCES); 3248 3249 return (0); 3250} 3251 3252static int 3253biba_vnode_check_write(struct ucred *active_cred, 3254 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3255{ 3256 struct mac_biba *subj, *obj; 3257 3258 if (!biba_enabled || !revocation_enabled) 3259 return (0); 3260 3261 subj = SLOT(active_cred->cr_label); 3262 obj = SLOT(vplabel); 3263 3264 if (!biba_dominate_effective(subj, obj)) 3265 return (EACCES); 3266 3267 return (0); 3268} 3269 3270static int 3271biba_vnode_create_extattr(struct ucred *cred, struct mount *mp, 3272 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 3273 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 3274{ 3275 struct mac_biba *source, *dest, mb_temp; 3276 size_t buflen; 3277 int error; 3278 3279 buflen = sizeof(mb_temp); 3280 bzero(&mb_temp, buflen); 3281 3282 source = SLOT(cred->cr_label); 3283 dest = SLOT(vplabel); 3284 biba_copy_effective(source, &mb_temp); 3285 3286 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3287 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3288 if (error == 0) 3289 biba_copy_effective(source, dest); 3290 return (error); 3291} 3292 3293static void 3294biba_vnode_relabel(struct ucred *cred, struct vnode *vp, 3295 struct label *vplabel, struct label *newlabel) 3296{ 3297 struct mac_biba *source, *dest; 3298 3299 source = SLOT(newlabel); 3300 dest = SLOT(vplabel); 3301 3302 biba_copy(source, dest); 3303} 3304 3305static int 3306biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 3307 struct label *vplabel, struct label *intlabel) 3308{ 3309 struct mac_biba *source, mb_temp; 3310 size_t buflen; 3311 int error; 3312 3313 buflen = sizeof(mb_temp); 3314 bzero(&mb_temp, buflen); 3315 3316 source = SLOT(intlabel); 3317 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0) 3318 return (0); 3319 3320 biba_copy_effective(source, &mb_temp); 3321 3322 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 3323 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); 3324 return (error); 3325} 3326 3327static struct mac_policy_ops mac_biba_ops = 3328{ 3329 .mpo_init = biba_init, 3330 3331 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, 3332 .mpo_bpfdesc_create = biba_bpfdesc_create, 3333 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, 3334 .mpo_bpfdesc_destroy_label = biba_destroy_label, 3335 .mpo_bpfdesc_init_label = biba_init_label, 3336 3337 .mpo_cred_associate_nfsd = biba_cred_associate_nfsd, 3338 .mpo_cred_check_relabel = biba_cred_check_relabel, 3339 .mpo_cred_check_visible = biba_cred_check_visible, 3340 .mpo_cred_copy_label = biba_copy_label, 3341 .mpo_cred_create_init = biba_cred_create_init, 3342 .mpo_cred_create_swapper = biba_cred_create_swapper, 3343 .mpo_cred_destroy_label = biba_destroy_label, 3344 .mpo_cred_externalize_label = biba_externalize_label, 3345 .mpo_cred_init_label = biba_init_label, 3346 .mpo_cred_internalize_label = biba_internalize_label, 3347 .mpo_cred_relabel = biba_cred_relabel, 3348 3349 .mpo_devfs_create_device = biba_devfs_create_device, 3350 .mpo_devfs_create_directory = biba_devfs_create_directory, 3351 .mpo_devfs_create_symlink = biba_devfs_create_symlink, 3352 .mpo_devfs_destroy_label = biba_destroy_label, 3353 .mpo_devfs_init_label = biba_init_label, 3354 .mpo_devfs_update = biba_devfs_update, 3355 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, 3356 3357 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, 3358 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, 3359 .mpo_ifnet_copy_label = biba_copy_label, 3360 .mpo_ifnet_create = biba_ifnet_create, 3361 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, 3362 .mpo_ifnet_destroy_label = biba_destroy_label, 3363 .mpo_ifnet_externalize_label = biba_externalize_label, 3364 .mpo_ifnet_init_label = biba_init_label, 3365 .mpo_ifnet_internalize_label = biba_internalize_label, 3366 .mpo_ifnet_relabel = biba_ifnet_relabel, 3367 3368 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, 3369 .mpo_inpcb_check_visible = biba_inpcb_check_visible, 3370 .mpo_inpcb_create = biba_inpcb_create, 3371 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, 3372 .mpo_inpcb_destroy_label = biba_destroy_label, 3373 .mpo_inpcb_init_label = biba_init_label_waitcheck, 3374 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, 3375 3376 .mpo_ip6q_create = biba_ip6q_create, 3377 .mpo_ip6q_destroy_label = biba_destroy_label, 3378 .mpo_ip6q_init_label = biba_init_label_waitcheck, 3379 .mpo_ip6q_match = biba_ip6q_match, 3380 .mpo_ip6q_reassemble = biba_ip6q_reassemble, 3381 .mpo_ip6q_update = biba_ip6q_update, 3382 3383 .mpo_ipq_create = biba_ipq_create, 3384 .mpo_ipq_destroy_label = biba_destroy_label, 3385 .mpo_ipq_init_label = biba_init_label_waitcheck, 3386 .mpo_ipq_match = biba_ipq_match, 3387 .mpo_ipq_reassemble = biba_ipq_reassemble, 3388 .mpo_ipq_update = biba_ipq_update, 3389 3390 .mpo_kld_check_load = biba_kld_check_load, 3391 3392 .mpo_mbuf_copy_label = biba_copy_label, 3393 .mpo_mbuf_destroy_label = biba_destroy_label, 3394 .mpo_mbuf_init_label = biba_init_label_waitcheck, 3395 3396 .mpo_mount_check_stat = biba_mount_check_stat, 3397 .mpo_mount_create = biba_mount_create, 3398 .mpo_mount_destroy_label = biba_destroy_label, 3399 .mpo_mount_init_label = biba_init_label, 3400 3401 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send, 3402 3403 .mpo_netinet_arp_send = biba_netinet_arp_send, 3404 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply, 3405 .mpo_netinet_firewall_send = biba_netinet_firewall_send, 3406 .mpo_netinet_fragment = biba_netinet_fragment, 3407 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply, 3408 .mpo_netinet_igmp_send = biba_netinet_igmp_send, 3409 3410 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send, 3411 3412 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, 3413 .mpo_pipe_check_poll = biba_pipe_check_poll, 3414 .mpo_pipe_check_read = biba_pipe_check_read, 3415 .mpo_pipe_check_relabel = biba_pipe_check_relabel, 3416 .mpo_pipe_check_stat = biba_pipe_check_stat, 3417 .mpo_pipe_check_write = biba_pipe_check_write, 3418 .mpo_pipe_copy_label = biba_copy_label, 3419 .mpo_pipe_create = biba_pipe_create, 3420 .mpo_pipe_destroy_label = biba_destroy_label, 3421 .mpo_pipe_externalize_label = biba_externalize_label, 3422 .mpo_pipe_init_label = biba_init_label, 3423 .mpo_pipe_internalize_label = biba_internalize_label, 3424 .mpo_pipe_relabel = biba_pipe_relabel, 3425 3426 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, 3427 .mpo_posixsem_check_open = biba_posixsem_check_openunlink, 3428 .mpo_posixsem_check_post = biba_posixsem_check_write, 3429 .mpo_posixsem_check_stat = biba_posixsem_check_rdonly, 3430 .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink, 3431 .mpo_posixsem_check_wait = biba_posixsem_check_write, 3432 .mpo_posixsem_create = biba_posixsem_create, 3433 .mpo_posixsem_destroy_label = biba_destroy_label, 3434 .mpo_posixsem_init_label = biba_init_label, 3435 3436 .mpo_priv_check = biba_priv_check, 3437 3438 .mpo_proc_check_debug = biba_proc_check_debug, 3439 .mpo_proc_check_sched = biba_proc_check_sched, 3440 .mpo_proc_check_signal = biba_proc_check_signal, 3441 3442 .mpo_socket_check_deliver = biba_socket_check_deliver, 3443 .mpo_socket_check_relabel = biba_socket_check_relabel, 3444 .mpo_socket_check_visible = biba_socket_check_visible, 3445 .mpo_socket_copy_label = biba_copy_label, 3446 .mpo_socket_create = biba_socket_create, 3447 .mpo_socket_create_mbuf = biba_socket_create_mbuf, 3448 .mpo_socket_destroy_label = biba_destroy_label, 3449 .mpo_socket_externalize_label = biba_externalize_label, 3450 .mpo_socket_init_label = biba_init_label_waitcheck, 3451 .mpo_socket_internalize_label = biba_internalize_label, 3452 .mpo_socket_newconn = biba_socket_newconn, 3453 .mpo_socket_relabel = biba_socket_relabel, 3454 3455 .mpo_socketpeer_destroy_label = biba_destroy_label, 3456 .mpo_socketpeer_externalize_label = biba_externalize_label, 3457 .mpo_socketpeer_init_label = biba_init_label_waitcheck, 3458 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, 3459 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, 3460 3461 .mpo_syncache_create = biba_syncache_create, 3462 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf, 3463 .mpo_syncache_destroy_label = biba_destroy_label, 3464 .mpo_syncache_init_label = biba_init_label_waitcheck, 3465 3466 .mpo_system_check_acct = biba_system_check_acct, 3467 .mpo_system_check_auditctl = biba_system_check_auditctl, 3468 .mpo_system_check_auditon = biba_system_check_auditon, 3469 .mpo_system_check_swapoff = biba_system_check_swapoff, 3470 .mpo_system_check_swapon = biba_system_check_swapon, 3471 .mpo_system_check_sysctl = biba_system_check_sysctl, 3472 3473 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, 3474 .mpo_sysvmsg_create = biba_sysvmsg_create, 3475 .mpo_sysvmsg_destroy_label = biba_destroy_label, 3476 .mpo_sysvmsg_init_label = biba_init_label, 3477 3478 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, 3479 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, 3480 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, 3481 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, 3482 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, 3483 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, 3484 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, 3485 .mpo_sysvmsq_create = biba_sysvmsq_create, 3486 .mpo_sysvmsq_destroy_label = biba_destroy_label, 3487 .mpo_sysvmsq_init_label = biba_init_label, 3488 3489 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, 3490 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, 3491 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, 3492 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, 3493 .mpo_sysvsem_create = biba_sysvsem_create, 3494 .mpo_sysvsem_destroy_label = biba_destroy_label, 3495 .mpo_sysvsem_init_label = biba_init_label, 3496 3497 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, 3498 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, 3499 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, 3500 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, 3501 .mpo_sysvshm_create = biba_sysvshm_create, 3502 .mpo_sysvshm_destroy_label = biba_destroy_label, 3503 .mpo_sysvshm_init_label = biba_init_label, 3504 3505 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, 3506 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, 3507 .mpo_vnode_check_access = biba_vnode_check_open, 3508 .mpo_vnode_check_chdir = biba_vnode_check_chdir, 3509 .mpo_vnode_check_chroot = biba_vnode_check_chroot, 3510 .mpo_vnode_check_create = biba_vnode_check_create, 3511 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, 3512 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, 3513 .mpo_vnode_check_exec = biba_vnode_check_exec, 3514 .mpo_vnode_check_getacl = biba_vnode_check_getacl, 3515 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, 3516 .mpo_vnode_check_link = biba_vnode_check_link, 3517 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, 3518 .mpo_vnode_check_lookup = biba_vnode_check_lookup, 3519 .mpo_vnode_check_mmap = biba_vnode_check_mmap, 3520 .mpo_vnode_check_open = biba_vnode_check_open, 3521 .mpo_vnode_check_poll = biba_vnode_check_poll, 3522 .mpo_vnode_check_read = biba_vnode_check_read, 3523 .mpo_vnode_check_readdir = biba_vnode_check_readdir, 3524 .mpo_vnode_check_readlink = biba_vnode_check_readlink, 3525 .mpo_vnode_check_relabel = biba_vnode_check_relabel, 3526 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, 3527 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, 3528 .mpo_vnode_check_revoke = biba_vnode_check_revoke, 3529 .mpo_vnode_check_setacl = biba_vnode_check_setacl, 3530 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, 3531 .mpo_vnode_check_setflags = biba_vnode_check_setflags, 3532 .mpo_vnode_check_setmode = biba_vnode_check_setmode, 3533 .mpo_vnode_check_setowner = biba_vnode_check_setowner, 3534 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, 3535 .mpo_vnode_check_stat = biba_vnode_check_stat, 3536 .mpo_vnode_check_unlink = biba_vnode_check_unlink, 3537 .mpo_vnode_check_write = biba_vnode_check_write, 3538 .mpo_vnode_create_extattr = biba_vnode_create_extattr, 3539 .mpo_vnode_copy_label = biba_copy_label, 3540 .mpo_vnode_destroy_label = biba_destroy_label, 3541 .mpo_vnode_externalize_label = biba_externalize_label, 3542 .mpo_vnode_init_label = biba_init_label, 3543 .mpo_vnode_internalize_label = biba_internalize_label, 3544 .mpo_vnode_relabel = biba_vnode_relabel, 3545 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, 3546}; 3547 3548#define BIBA_OBJECTS (MPC_OBJECT_CRED | \ 3549 /* MPC_OBJECT_PROC | */ \ 3550 MPC_OBJECT_VNODE | \ 3551 MPC_OBJECT_INPCB | \ 3552 MPC_OBJECT_SOCKET | \ 3553 MPC_OBJECT_DEVFS | \ 3554 MPC_OBJECT_MBUF | \ 3555 MPC_OBJECT_IPQ | \ 3556 MPC_OBJECT_IP6Q | \ 3557 MPC_OBJECT_IFNET | \ 3558 MPC_OBJECT_BPFDESC | \ 3559 MPC_OBJECT_PIPE | \ 3560 MPC_OBJECT_MOUNT | \ 3561 MPC_OBJECT_POSIXSEM | \ 3562 /* MPC_OBJECT_POSIXSHM | */ \ 3563 MPC_OBJECT_SYSVMSG | \ 3564 MPC_OBJECT_SYSVMSQ | \ 3565 MPC_OBJECT_SYSVSEM | \ 3566 MPC_OBJECT_SYSVSHM | \ 3567 MPC_OBJECT_SYNCACHE) 3568 3569MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3570 MPC_LOADTIME_FLAG_NOTLATE, &biba_slot, BIBA_OBJECTS); 3571