mac_biba.c revision 168976
1/*- 2 * Copyright (c) 1999-2002, 2007 Robert N. M. Watson 3 * Copyright (c) 2001-2005 McAfee, Inc. 4 * All rights reserved. 5 * 6 * This software was developed by Robert Watson for the TrustedBSD Project. 7 * 8 * This software was developed for the FreeBSD Project in part by McAfee 9 * Research, the Security Research Division of McAfee, Inc. under 10 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 11 * CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $FreeBSD: head/sys/security/mac_biba/mac_biba.c 168976 2007-04-23 13:15:23Z rwatson $ 35 */ 36 37/* 38 * Developed by the TrustedBSD Project. 39 * 40 * Biba fixed label mandatory integrity policy. 41 */ 42 43#include <sys/param.h> 44#include <sys/conf.h> 45#include <sys/extattr.h> 46#include <sys/kernel.h> 47#include <sys/ksem.h> 48#include <sys/malloc.h> 49#include <sys/mman.h> 50#include <sys/mount.h> 51#include <sys/priv.h> 52#include <sys/proc.h> 53#include <sys/sbuf.h> 54#include <sys/systm.h> 55#include <sys/sysproto.h> 56#include <sys/sysent.h> 57#include <sys/systm.h> 58#include <sys/vnode.h> 59#include <sys/file.h> 60#include <sys/socket.h> 61#include <sys/socketvar.h> 62#include <sys/pipe.h> 63#include <sys/sx.h> 64#include <sys/sysctl.h> 65#include <sys/msg.h> 66#include <sys/sem.h> 67#include <sys/shm.h> 68 69#include <fs/devfs/devfs.h> 70 71#include <net/bpfdesc.h> 72#include <net/if.h> 73#include <net/if_types.h> 74#include <net/if_var.h> 75 76#include <netinet/in.h> 77#include <netinet/in_pcb.h> 78#include <netinet/ip_var.h> 79 80#include <vm/uma.h> 81#include <vm/vm.h> 82 83#include <security/mac/mac_policy.h> 84#include <security/mac_biba/mac_biba.h> 85 86SYSCTL_DECL(_security_mac); 87 88SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0, 89 "TrustedBSD mac_biba policy controls"); 90 91static int mac_biba_label_size = sizeof(struct mac_biba); 92SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD, 93 &mac_biba_label_size, 0, "Size of struct mac_biba"); 94 95static int mac_biba_enabled = 1; 96SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, 97 &mac_biba_enabled, 0, "Enforce MAC/Biba policy"); 98TUNABLE_INT("security.mac.biba.enabled", &mac_biba_enabled); 99 100static int destroyed_not_inited; 101SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 102 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 103 104static int trust_all_interfaces = 0; 105SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, 106 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); 107TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces); 108 109static char trusted_interfaces[128]; 110SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD, 111 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); 112TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces, 113 sizeof(trusted_interfaces)); 114 115static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS; 116SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD, 117 &max_compartments, 0, "Maximum supported compartments"); 118 119static int ptys_equal = 0; 120SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, 121 &ptys_equal, 0, "Label pty devices as biba/equal on create"); 122TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal); 123 124static int interfaces_equal; 125SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RW, 126 &interfaces_equal, 0, "Label network interfaces as biba/equal on create"); 127TUNABLE_INT("security.mac.biba.interfaces_equal", &interfaces_equal); 128 129static int revocation_enabled = 0; 130SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW, 131 &revocation_enabled, 0, "Revoke access to objects on relabel"); 132TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled); 133 134static int mac_biba_slot; 135#define SLOT(l) ((struct mac_biba *)mac_label_get((l), mac_biba_slot)) 136#define SLOT_SET(l, val) mac_label_set((l), mac_biba_slot, (uintptr_t)(val)) 137 138static uma_zone_t zone_biba; 139 140static __inline int 141biba_bit_set_empty(u_char *set) { 142 int i; 143 144 for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++) 145 if (set[i] != 0) 146 return (0); 147 return (1); 148} 149 150static struct mac_biba * 151biba_alloc(int flag) 152{ 153 154 return (uma_zalloc(zone_biba, flag | M_ZERO)); 155} 156 157static void 158biba_free(struct mac_biba *mac_biba) 159{ 160 161 if (mac_biba != NULL) 162 uma_zfree(zone_biba, mac_biba); 163 else 164 atomic_add_int(&destroyed_not_inited, 1); 165} 166 167static int 168biba_atmostflags(struct mac_biba *mac_biba, int flags) 169{ 170 171 if ((mac_biba->mb_flags & flags) != mac_biba->mb_flags) 172 return (EINVAL); 173 return (0); 174} 175 176static int 177mac_biba_dominate_element(struct mac_biba_element *a, 178 struct mac_biba_element *b) 179{ 180 int bit; 181 182 switch (a->mbe_type) { 183 case MAC_BIBA_TYPE_EQUAL: 184 case MAC_BIBA_TYPE_HIGH: 185 return (1); 186 187 case MAC_BIBA_TYPE_LOW: 188 switch (b->mbe_type) { 189 case MAC_BIBA_TYPE_GRADE: 190 case MAC_BIBA_TYPE_HIGH: 191 return (0); 192 193 case MAC_BIBA_TYPE_EQUAL: 194 case MAC_BIBA_TYPE_LOW: 195 return (1); 196 197 default: 198 panic("mac_biba_dominate_element: b->mbe_type invalid"); 199 } 200 201 case MAC_BIBA_TYPE_GRADE: 202 switch (b->mbe_type) { 203 case MAC_BIBA_TYPE_EQUAL: 204 case MAC_BIBA_TYPE_LOW: 205 return (1); 206 207 case MAC_BIBA_TYPE_HIGH: 208 return (0); 209 210 case MAC_BIBA_TYPE_GRADE: 211 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) 212 if (!MAC_BIBA_BIT_TEST(bit, 213 a->mbe_compartments) && 214 MAC_BIBA_BIT_TEST(bit, b->mbe_compartments)) 215 return (0); 216 return (a->mbe_grade >= b->mbe_grade); 217 218 default: 219 panic("mac_biba_dominate_element: b->mbe_type invalid"); 220 } 221 222 default: 223 panic("mac_biba_dominate_element: a->mbe_type invalid"); 224 } 225 226 return (0); 227} 228 229static int 230mac_biba_subject_dominate_high(struct mac_biba *mac_biba) 231{ 232 struct mac_biba_element *element; 233 234 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 235 ("mac_biba_effective_in_range: mac_biba not effective")); 236 element = &mac_biba->mb_effective; 237 238 return (element->mbe_type == MAC_BIBA_TYPE_EQUAL || 239 element->mbe_type == MAC_BIBA_TYPE_HIGH); 240} 241 242static int 243mac_biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb) 244{ 245 246 return (mac_biba_dominate_element(&rangeb->mb_rangehigh, 247 &rangea->mb_rangehigh) && 248 mac_biba_dominate_element(&rangea->mb_rangelow, 249 &rangeb->mb_rangelow)); 250} 251 252static int 253mac_biba_effective_in_range(struct mac_biba *effective, 254 struct mac_biba *range) 255{ 256 257 KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 258 ("mac_biba_effective_in_range: a not effective")); 259 KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 260 ("mac_biba_effective_in_range: b not range")); 261 262 return (mac_biba_dominate_element(&range->mb_rangehigh, 263 &effective->mb_effective) && 264 mac_biba_dominate_element(&effective->mb_effective, 265 &range->mb_rangelow)); 266 267 return (1); 268} 269 270static int 271mac_biba_dominate_effective(struct mac_biba *a, struct mac_biba *b) 272{ 273 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 274 ("mac_biba_dominate_effective: a not effective")); 275 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 276 ("mac_biba_dominate_effective: b not effective")); 277 278 return (mac_biba_dominate_element(&a->mb_effective, &b->mb_effective)); 279} 280 281static int 282mac_biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b) 283{ 284 285 if (a->mbe_type == MAC_BIBA_TYPE_EQUAL || 286 b->mbe_type == MAC_BIBA_TYPE_EQUAL) 287 return (1); 288 289 return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade); 290} 291 292static int 293mac_biba_equal_effective(struct mac_biba *a, struct mac_biba *b) 294{ 295 296 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 297 ("mac_biba_equal_effective: a not effective")); 298 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 299 ("mac_biba_equal_effective: b not effective")); 300 301 return (mac_biba_equal_element(&a->mb_effective, &b->mb_effective)); 302} 303 304static int 305mac_biba_contains_equal(struct mac_biba *mac_biba) 306{ 307 308 if (mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) 309 if (mac_biba->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL) 310 return (1); 311 312 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 313 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL) 314 return (1); 315 if (mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 316 return (1); 317 } 318 319 return (0); 320} 321 322static int 323mac_biba_subject_privileged(struct mac_biba *mac_biba) 324{ 325 326 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAGS_BOTH) == 327 MAC_BIBA_FLAGS_BOTH, 328 ("mac_biba_subject_privileged: subject doesn't have both labels")); 329 330 /* If the effective is EQUAL, it's ok. */ 331 if (mac_biba->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL) 332 return (0); 333 334 /* If either range endpoint is EQUAL, it's ok. */ 335 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL || 336 mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 337 return (0); 338 339 /* If the range is low-high, it's ok. */ 340 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW && 341 mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH) 342 return (0); 343 344 /* It's not ok. */ 345 return (EPERM); 346} 347 348static int 349mac_biba_high_effective(struct mac_biba *mac_biba) 350{ 351 352 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 353 ("mac_biba_equal_effective: mac_biba not effective")); 354 355 return (mac_biba->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH); 356} 357 358static int 359mac_biba_valid(struct mac_biba *mac_biba) 360{ 361 362 if (mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 363 switch (mac_biba->mb_effective.mbe_type) { 364 case MAC_BIBA_TYPE_GRADE: 365 break; 366 367 case MAC_BIBA_TYPE_EQUAL: 368 case MAC_BIBA_TYPE_HIGH: 369 case MAC_BIBA_TYPE_LOW: 370 if (mac_biba->mb_effective.mbe_grade != 0 || 371 !MAC_BIBA_BIT_SET_EMPTY( 372 mac_biba->mb_effective.mbe_compartments)) 373 return (EINVAL); 374 break; 375 376 default: 377 return (EINVAL); 378 } 379 } else { 380 if (mac_biba->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF) 381 return (EINVAL); 382 } 383 384 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 385 switch (mac_biba->mb_rangelow.mbe_type) { 386 case MAC_BIBA_TYPE_GRADE: 387 break; 388 389 case MAC_BIBA_TYPE_EQUAL: 390 case MAC_BIBA_TYPE_HIGH: 391 case MAC_BIBA_TYPE_LOW: 392 if (mac_biba->mb_rangelow.mbe_grade != 0 || 393 !MAC_BIBA_BIT_SET_EMPTY( 394 mac_biba->mb_rangelow.mbe_compartments)) 395 return (EINVAL); 396 break; 397 398 default: 399 return (EINVAL); 400 } 401 402 switch (mac_biba->mb_rangehigh.mbe_type) { 403 case MAC_BIBA_TYPE_GRADE: 404 break; 405 406 case MAC_BIBA_TYPE_EQUAL: 407 case MAC_BIBA_TYPE_HIGH: 408 case MAC_BIBA_TYPE_LOW: 409 if (mac_biba->mb_rangehigh.mbe_grade != 0 || 410 !MAC_BIBA_BIT_SET_EMPTY( 411 mac_biba->mb_rangehigh.mbe_compartments)) 412 return (EINVAL); 413 break; 414 415 default: 416 return (EINVAL); 417 } 418 if (!mac_biba_dominate_element(&mac_biba->mb_rangehigh, 419 &mac_biba->mb_rangelow)) 420 return (EINVAL); 421 } else { 422 if (mac_biba->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF || 423 mac_biba->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF) 424 return (EINVAL); 425 } 426 427 return (0); 428} 429 430static void 431mac_biba_set_range(struct mac_biba *mac_biba, u_short typelow, 432 u_short gradelow, u_char *compartmentslow, u_short typehigh, 433 u_short gradehigh, u_char *compartmentshigh) 434{ 435 436 mac_biba->mb_rangelow.mbe_type = typelow; 437 mac_biba->mb_rangelow.mbe_grade = gradelow; 438 if (compartmentslow != NULL) 439 memcpy(mac_biba->mb_rangelow.mbe_compartments, 440 compartmentslow, 441 sizeof(mac_biba->mb_rangelow.mbe_compartments)); 442 mac_biba->mb_rangehigh.mbe_type = typehigh; 443 mac_biba->mb_rangehigh.mbe_grade = gradehigh; 444 if (compartmentshigh != NULL) 445 memcpy(mac_biba->mb_rangehigh.mbe_compartments, 446 compartmentshigh, 447 sizeof(mac_biba->mb_rangehigh.mbe_compartments)); 448 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 449} 450 451static void 452mac_biba_set_effective(struct mac_biba *mac_biba, u_short type, u_short grade, 453 u_char *compartments) 454{ 455 456 mac_biba->mb_effective.mbe_type = type; 457 mac_biba->mb_effective.mbe_grade = grade; 458 if (compartments != NULL) 459 memcpy(mac_biba->mb_effective.mbe_compartments, compartments, 460 sizeof(mac_biba->mb_effective.mbe_compartments)); 461 mac_biba->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; 462} 463 464static void 465mac_biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto) 466{ 467 468 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 469 ("mac_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 477mac_biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto) 478{ 479 480 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, 481 ("mac_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 488mac_biba_copy(struct mac_biba *source, struct mac_biba *dest) 489{ 490 491 if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) 492 mac_biba_copy_effective(source, dest); 493 if (source->mb_flags & MAC_BIBA_FLAG_RANGE) 494 mac_biba_copy_range(source, dest); 495} 496 497/* 498 * Policy module operations. 499 */ 500static void 501mac_biba_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 512mac_biba_init_label(struct label *label) 513{ 514 515 SLOT_SET(label, biba_alloc(M_WAITOK)); 516} 517 518static int 519mac_biba_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 530mac_biba_destroy_label(struct label *label) 531{ 532 533 biba_free(SLOT(label)); 534 SLOT_SET(label, NULL); 535} 536 537/* 538 * mac_biba_element_to_string() accepts an sbuf and Biba element. It 539 * converts the Biba element to a string and stores the result in the 540 * sbuf; if there isn't space in the sbuf, -1 is returned. 541 */ 542static int 543mac_biba_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("mac_biba_element_to_string: invalid type (%d)", 580 element->mbe_type); 581 } 582} 583 584/* 585 * mac_biba_to_string() converts a Biba label to a string, and places 586 * the results in the passed sbuf. It returns 0 on success, or EINVAL 587 * if there isn't room in the sbuf. Note: the sbuf will be modified 588 * even in a failure case, so the caller may need to revert the sbuf 589 * by restoring the offset if that's undesired. 590 */ 591static int 592mac_biba_to_string(struct sbuf *sb, struct mac_biba *mac_biba) 593{ 594 595 if (mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 596 if (mac_biba_element_to_string(sb, &mac_biba->mb_effective) 597 == -1) 598 return (EINVAL); 599 } 600 601 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 602 if (sbuf_putc(sb, '(') == -1) 603 return (EINVAL); 604 605 if (mac_biba_element_to_string(sb, &mac_biba->mb_rangelow) 606 == -1) 607 return (EINVAL); 608 609 if (sbuf_putc(sb, '-') == -1) 610 return (EINVAL); 611 612 if (mac_biba_element_to_string(sb, &mac_biba->mb_rangehigh) 613 == -1) 614 return (EINVAL); 615 616 if (sbuf_putc(sb, ')') == -1) 617 return (EINVAL); 618 } 619 620 return (0); 621} 622 623static int 624mac_biba_externalize_label(struct label *label, char *element_name, 625 struct sbuf *sb, int *claimed) 626{ 627 struct mac_biba *mac_biba; 628 629 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 630 return (0); 631 632 (*claimed)++; 633 634 mac_biba = SLOT(label); 635 return (mac_biba_to_string(sb, mac_biba)); 636} 637 638static int 639mac_biba_parse_element(struct mac_biba_element *element, char *string) 640{ 641 char *compartment, *end, *grade; 642 int value; 643 644 if (strcmp(string, "high") == 0 || 645 strcmp(string, "hi") == 0) { 646 element->mbe_type = MAC_BIBA_TYPE_HIGH; 647 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 648 } else if (strcmp(string, "low") == 0 || 649 strcmp(string, "lo") == 0) { 650 element->mbe_type = MAC_BIBA_TYPE_LOW; 651 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 652 } else if (strcmp(string, "equal") == 0 || 653 strcmp(string, "eq") == 0) { 654 element->mbe_type = MAC_BIBA_TYPE_EQUAL; 655 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 656 } else { 657 element->mbe_type = MAC_BIBA_TYPE_GRADE; 658 659 /* 660 * Numeric grade piece of the element. 661 */ 662 grade = strsep(&string, ":"); 663 value = strtol(grade, &end, 10); 664 if (end == grade || *end != '\0') 665 return (EINVAL); 666 if (value < 0 || value > 65535) 667 return (EINVAL); 668 element->mbe_grade = value; 669 670 /* 671 * Optional compartment piece of the element. If none 672 * are included, we assume that the label has no 673 * compartments. 674 */ 675 if (string == NULL) 676 return (0); 677 if (*string == '\0') 678 return (0); 679 680 while ((compartment = strsep(&string, "+")) != NULL) { 681 value = strtol(compartment, &end, 10); 682 if (compartment == end || *end != '\0') 683 return (EINVAL); 684 if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS) 685 return (EINVAL); 686 MAC_BIBA_BIT_SET(value, element->mbe_compartments); 687 } 688 } 689 690 return (0); 691} 692 693/* 694 * Note: destructively consumes the string, make a local copy before 695 * calling if that's a problem. 696 */ 697static int 698mac_biba_parse(struct mac_biba *mac_biba, char *string) 699{ 700 char *rangehigh, *rangelow, *effective; 701 int error; 702 703 effective = strsep(&string, "("); 704 if (*effective == '\0') 705 effective = NULL; 706 707 if (string != NULL) { 708 rangelow = strsep(&string, "-"); 709 if (string == NULL) 710 return (EINVAL); 711 rangehigh = strsep(&string, ")"); 712 if (string == NULL) 713 return (EINVAL); 714 if (*string != '\0') 715 return (EINVAL); 716 } else { 717 rangelow = NULL; 718 rangehigh = NULL; 719 } 720 721 KASSERT((rangelow != NULL && rangehigh != NULL) || 722 (rangelow == NULL && rangehigh == NULL), 723 ("mac_biba_parse: range mismatch")); 724 725 bzero(mac_biba, sizeof(*mac_biba)); 726 if (effective != NULL) { 727 error = mac_biba_parse_element(&mac_biba->mb_effective, effective); 728 if (error) 729 return (error); 730 mac_biba->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; 731 } 732 733 if (rangelow != NULL) { 734 error = mac_biba_parse_element(&mac_biba->mb_rangelow, 735 rangelow); 736 if (error) 737 return (error); 738 error = mac_biba_parse_element(&mac_biba->mb_rangehigh, 739 rangehigh); 740 if (error) 741 return (error); 742 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 743 } 744 745 error = mac_biba_valid(mac_biba); 746 if (error) 747 return (error); 748 749 return (0); 750} 751 752static int 753mac_biba_internalize_label(struct label *label, char *element_name, 754 char *element_data, int *claimed) 755{ 756 struct mac_biba *mac_biba, mac_biba_temp; 757 int error; 758 759 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 760 return (0); 761 762 (*claimed)++; 763 764 error = mac_biba_parse(&mac_biba_temp, element_data); 765 if (error) 766 return (error); 767 768 mac_biba = SLOT(label); 769 *mac_biba = mac_biba_temp; 770 771 return (0); 772} 773 774static void 775mac_biba_copy_label(struct label *src, struct label *dest) 776{ 777 778 *SLOT(dest) = *SLOT(src); 779} 780 781/* 782 * Labeling event operations: file system objects, and things that look 783 * a lot like file system objects. 784 */ 785static void 786mac_biba_create_devfs_device(struct ucred *cred, struct mount *mp, 787 struct cdev *dev, struct devfs_dirent *de, struct label *delabel) 788{ 789 struct mac_biba *mac_biba; 790 int biba_type; 791 792 mac_biba = SLOT(delabel); 793 if (strcmp(dev->si_name, "null") == 0 || 794 strcmp(dev->si_name, "zero") == 0 || 795 strcmp(dev->si_name, "random") == 0 || 796 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 797 biba_type = MAC_BIBA_TYPE_EQUAL; 798 else if (ptys_equal && 799 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 800 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 801 biba_type = MAC_BIBA_TYPE_EQUAL; 802 else 803 biba_type = MAC_BIBA_TYPE_HIGH; 804 mac_biba_set_effective(mac_biba, biba_type, 0, NULL); 805} 806 807static void 808mac_biba_create_devfs_directory(struct mount *mp, char *dirname, 809 int dirnamelen, struct devfs_dirent *de, struct label *delabel) 810{ 811 struct mac_biba *mac_biba; 812 813 mac_biba = SLOT(delabel); 814 mac_biba_set_effective(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 815} 816 817static void 818mac_biba_create_devfs_symlink(struct ucred *cred, struct mount *mp, 819 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 820 struct label *delabel) 821{ 822 struct mac_biba *source, *dest; 823 824 source = SLOT(cred->cr_label); 825 dest = SLOT(delabel); 826 827 mac_biba_copy_effective(source, dest); 828} 829 830static void 831mac_biba_create_mount(struct ucred *cred, struct mount *mp, 832 struct label *mplabel) 833{ 834 struct mac_biba *source, *dest; 835 836 source = SLOT(cred->cr_label); 837 dest = SLOT(mplabel); 838 mac_biba_copy_effective(source, dest); 839} 840 841static void 842mac_biba_relabel_vnode(struct ucred *cred, struct vnode *vp, 843 struct label *vplabel, struct label *newlabel) 844{ 845 struct mac_biba *source, *dest; 846 847 source = SLOT(newlabel); 848 dest = SLOT(vplabel); 849 850 mac_biba_copy(source, dest); 851} 852 853static void 854mac_biba_update_devfsdirent(struct mount *mp, struct devfs_dirent *de, 855 struct label *delabel, struct vnode *vp, struct label *vplabel) 856{ 857 struct mac_biba *source, *dest; 858 859 source = SLOT(vplabel); 860 dest = SLOT(delabel); 861 862 mac_biba_copy(source, dest); 863} 864 865static void 866mac_biba_associate_vnode_devfs(struct mount *mp, struct label *mntlabel, 867 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 868 struct label *vplabel) 869{ 870 struct mac_biba *source, *dest; 871 872 source = SLOT(delabel); 873 dest = SLOT(vplabel); 874 875 mac_biba_copy_effective(source, dest); 876} 877 878static int 879mac_biba_associate_vnode_extattr(struct mount *mp, struct label *mplabel, 880 struct vnode *vp, struct label *vplabel) 881{ 882 struct mac_biba temp, *source, *dest; 883 int buflen, error; 884 885 source = SLOT(mplabel); 886 dest = SLOT(vplabel); 887 888 buflen = sizeof(temp); 889 bzero(&temp, buflen); 890 891 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 892 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &temp, curthread); 893 if (error == ENOATTR || error == EOPNOTSUPP) { 894 /* Fall back to the mntlabel. */ 895 mac_biba_copy_effective(source, dest); 896 return (0); 897 } else if (error) 898 return (error); 899 900 if (buflen != sizeof(temp)) { 901 printf("mac_biba_associate_vnode_extattr: bad size %d\n", 902 buflen); 903 return (EPERM); 904 } 905 if (mac_biba_valid(&temp) != 0) { 906 printf("mac_biba_associate_vnode_extattr: invalid\n"); 907 return (EPERM); 908 } 909 if ((temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_EFFECTIVE) { 910 printf("mac_biba_associate_vnode_extattr: not effective\n"); 911 return (EPERM); 912 } 913 914 mac_biba_copy_effective(&temp, dest); 915 return (0); 916} 917 918static void 919mac_biba_associate_vnode_singlelabel(struct mount *mp, 920 struct label *mplabel, struct vnode *vp, struct label *vplabel) 921{ 922 struct mac_biba *source, *dest; 923 924 source = SLOT(mplabel); 925 dest = SLOT(vplabel); 926 927 mac_biba_copy_effective(source, dest); 928} 929 930static int 931mac_biba_create_vnode_extattr(struct ucred *cred, struct mount *mp, 932 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 933 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 934{ 935 struct mac_biba *source, *dest, temp; 936 size_t buflen; 937 int error; 938 939 buflen = sizeof(temp); 940 bzero(&temp, buflen); 941 942 source = SLOT(cred->cr_label); 943 dest = SLOT(vplabel); 944 mac_biba_copy_effective(source, &temp); 945 946 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 947 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 948 if (error == 0) 949 mac_biba_copy_effective(source, dest); 950 return (error); 951} 952 953static int 954mac_biba_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 955 struct label *vplabel, struct label *intlabel) 956{ 957 struct mac_biba *source, temp; 958 size_t buflen; 959 int error; 960 961 buflen = sizeof(temp); 962 bzero(&temp, buflen); 963 964 source = SLOT(intlabel); 965 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0) 966 return (0); 967 968 mac_biba_copy_effective(source, &temp); 969 970 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 971 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 972 return (error); 973} 974 975/* 976 * Labeling event operations: IPC object. 977 */ 978static void 979mac_biba_create_inpcb_from_socket(struct socket *so, struct label *solabel, 980 struct inpcb *inp, struct label *inplabel) 981{ 982 struct mac_biba *source, *dest; 983 984 source = SLOT(solabel); 985 dest = SLOT(inplabel); 986 987 mac_biba_copy_effective(source, dest); 988} 989 990static void 991mac_biba_create_mbuf_from_socket(struct socket *so, struct label *solabel, 992 struct mbuf *m, struct label *mlabel) 993{ 994 struct mac_biba *source, *dest; 995 996 source = SLOT(solabel); 997 dest = SLOT(mlabel); 998 999 mac_biba_copy_effective(source, dest); 1000} 1001 1002static void 1003mac_biba_create_socket(struct ucred *cred, struct socket *so, 1004 struct label *solabel) 1005{ 1006 struct mac_biba *source, *dest; 1007 1008 source = SLOT(cred->cr_label); 1009 dest = SLOT(solabel); 1010 1011 mac_biba_copy_effective(source, dest); 1012} 1013 1014static void 1015mac_biba_create_pipe(struct ucred *cred, struct pipepair *pp, 1016 struct label *pplabel) 1017{ 1018 struct mac_biba *source, *dest; 1019 1020 source = SLOT(cred->cr_label); 1021 dest = SLOT(pplabel); 1022 1023 mac_biba_copy_effective(source, dest); 1024} 1025 1026static void 1027mac_biba_create_posix_sem(struct ucred *cred, struct ksem *ksemptr, 1028 struct label *ks_label) 1029{ 1030 struct mac_biba *source, *dest; 1031 1032 source = SLOT(cred->cr_label); 1033 dest = SLOT(ks_label); 1034 1035 mac_biba_copy_effective(source, dest); 1036} 1037 1038static void 1039mac_biba_create_socket_from_socket(struct socket *oldso, 1040 struct label *oldsolabel, struct socket *newso, struct label *newsolabel) 1041{ 1042 struct mac_biba *source, *dest; 1043 1044 source = SLOT(oldsolabel); 1045 dest = SLOT(newsolabel); 1046 1047 mac_biba_copy_effective(source, dest); 1048} 1049 1050static void 1051mac_biba_relabel_socket(struct ucred *cred, struct socket *so, 1052 struct label *solabel, struct label *newlabel) 1053{ 1054 struct mac_biba *source, *dest; 1055 1056 source = SLOT(newlabel); 1057 dest = SLOT(solabel); 1058 1059 mac_biba_copy(source, dest); 1060} 1061 1062static void 1063mac_biba_relabel_pipe(struct ucred *cred, struct pipepair *pp, 1064 struct label *pplabel, struct label *newlabel) 1065{ 1066 struct mac_biba *source, *dest; 1067 1068 source = SLOT(newlabel); 1069 dest = SLOT(pplabel); 1070 1071 mac_biba_copy(source, dest); 1072} 1073 1074static void 1075mac_biba_set_socket_peer_from_mbuf(struct mbuf *m, struct label *mlabel, 1076 struct socket *so, struct label *sopeerlabel) 1077{ 1078 struct mac_biba *source, *dest; 1079 1080 source = SLOT(mlabel); 1081 dest = SLOT(sopeerlabel); 1082 1083 mac_biba_copy_effective(source, dest); 1084} 1085 1086/* 1087 * Labeling event operations: System V IPC objects. 1088 */ 1089static void 1090mac_biba_create_sysv_msgmsg(struct ucred *cred, struct msqid_kernel *msqkptr, 1091 struct label *msqlabel, struct msg *msgptr, struct label *msglabel) 1092{ 1093 struct mac_biba *source, *dest; 1094 1095 /* Ignore the msgq label */ 1096 source = SLOT(cred->cr_label); 1097 dest = SLOT(msglabel); 1098 1099 mac_biba_copy_effective(source, dest); 1100} 1101 1102static void 1103mac_biba_create_sysv_msgqueue(struct ucred *cred, 1104 struct msqid_kernel *msqkptr, struct label *msqlabel) 1105{ 1106 struct mac_biba *source, *dest; 1107 1108 source = SLOT(cred->cr_label); 1109 dest = SLOT(msqlabel); 1110 1111 mac_biba_copy_effective(source, dest); 1112} 1113 1114static void 1115mac_biba_create_sysv_sem(struct ucred *cred, struct semid_kernel *semakptr, 1116 struct label *semalabel) 1117{ 1118 struct mac_biba *source, *dest; 1119 1120 source = SLOT(cred->cr_label); 1121 dest = SLOT(semalabel); 1122 1123 mac_biba_copy_effective(source, dest); 1124} 1125 1126static void 1127mac_biba_create_sysv_shm(struct ucred *cred, struct shmid_kernel *shmsegptr, 1128 struct label *shmlabel) 1129{ 1130 struct mac_biba *source, *dest; 1131 1132 source = SLOT(cred->cr_label); 1133 dest = SLOT(shmlabel); 1134 1135 mac_biba_copy_effective(source, dest); 1136} 1137 1138/* 1139 * Labeling event operations: network objects. 1140 */ 1141static void 1142mac_biba_set_socket_peer_from_socket(struct socket *oldso, 1143 struct label *oldsolabel, struct socket *newso, 1144 struct label *newsopeerlabel) 1145{ 1146 struct mac_biba *source, *dest; 1147 1148 source = SLOT(oldsolabel); 1149 dest = SLOT(newsopeerlabel); 1150 1151 mac_biba_copy_effective(source, dest); 1152} 1153 1154static void 1155mac_biba_create_bpfdesc(struct ucred *cred, struct bpf_d *d, 1156 struct label *dlabel) 1157{ 1158 struct mac_biba *source, *dest; 1159 1160 source = SLOT(cred->cr_label); 1161 dest = SLOT(dlabel); 1162 1163 mac_biba_copy_effective(source, dest); 1164} 1165 1166static void 1167mac_biba_create_ifnet(struct ifnet *ifp, struct label *ifplabel) 1168{ 1169 char tifname[IFNAMSIZ], *p, *q; 1170 char tiflist[sizeof(trusted_interfaces)]; 1171 struct mac_biba *dest; 1172 int len, type; 1173 1174 dest = SLOT(ifplabel); 1175 1176 if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) { 1177 type = MAC_BIBA_TYPE_EQUAL; 1178 goto set; 1179 } 1180 1181 if (trust_all_interfaces) { 1182 type = MAC_BIBA_TYPE_HIGH; 1183 goto set; 1184 } 1185 1186 type = MAC_BIBA_TYPE_LOW; 1187 1188 if (trusted_interfaces[0] == '\0' || 1189 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1190 goto set; 1191 1192 bzero(tiflist, sizeof(tiflist)); 1193 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1194 if(*p != ' ' && *p != '\t') 1195 *q = *p; 1196 1197 for (p = q = tiflist;; p++) { 1198 if (*p == ',' || *p == '\0') { 1199 len = p - q; 1200 if (len < IFNAMSIZ) { 1201 bzero(tifname, sizeof(tifname)); 1202 bcopy(q, tifname, len); 1203 if (strcmp(tifname, ifp->if_xname) == 0) { 1204 type = MAC_BIBA_TYPE_HIGH; 1205 break; 1206 } 1207 } else { 1208 *p = '\0'; 1209 printf("mac_biba warning: interface name " 1210 "\"%s\" is too long (must be < %d)\n", 1211 q, IFNAMSIZ); 1212 } 1213 if (*p == '\0') 1214 break; 1215 q = p + 1; 1216 } 1217 } 1218set: 1219 mac_biba_set_effective(dest, type, 0, NULL); 1220 mac_biba_set_range(dest, type, 0, NULL, type, 0, NULL); 1221} 1222 1223static void 1224mac_biba_create_ipq(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1225 struct label *ipqlabel) 1226{ 1227 struct mac_biba *source, *dest; 1228 1229 source = SLOT(mlabel); 1230 dest = SLOT(ipqlabel); 1231 1232 mac_biba_copy_effective(source, dest); 1233} 1234 1235static void 1236mac_biba_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel, 1237 struct mbuf *m, struct label *mlabel) 1238{ 1239 struct mac_biba *source, *dest; 1240 1241 source = SLOT(ipqlabel); 1242 dest = SLOT(mlabel); 1243 1244 /* Just use the head, since we require them all to match. */ 1245 mac_biba_copy_effective(source, dest); 1246} 1247 1248static void 1249mac_biba_create_fragment(struct mbuf *m, struct label *mlabel, 1250 struct mbuf *frag, struct label *fraglabel) 1251{ 1252 struct mac_biba *source, *dest; 1253 1254 source = SLOT(mlabel); 1255 dest = SLOT(fraglabel); 1256 1257 mac_biba_copy_effective(source, dest); 1258} 1259 1260static void 1261mac_biba_create_mbuf_from_inpcb(struct inpcb *inp, struct label *inplabel, 1262 struct mbuf *m, struct label *mlabel) 1263{ 1264 struct mac_biba *source, *dest; 1265 1266 source = SLOT(inplabel); 1267 dest = SLOT(mlabel); 1268 1269 mac_biba_copy_effective(source, dest); 1270} 1271 1272static void 1273mac_biba_create_mbuf_linklayer(struct ifnet *ifp, struct label *ifplabel, 1274 struct mbuf *m, struct label *mlabel) 1275{ 1276 struct mac_biba *dest; 1277 1278 dest = SLOT(mlabel); 1279 1280 mac_biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1281} 1282 1283static void 1284mac_biba_create_mbuf_from_bpfdesc(struct bpf_d *d, struct label *dlabel, 1285 struct mbuf *m, struct label *mlabel) 1286{ 1287 struct mac_biba *source, *dest; 1288 1289 source = SLOT(dlabel); 1290 dest = SLOT(mlabel); 1291 1292 mac_biba_copy_effective(source, dest); 1293} 1294 1295static void 1296mac_biba_create_mbuf_from_ifnet(struct ifnet *ifp, struct label *ifplabel, 1297 struct mbuf *m, struct label *mlabel) 1298{ 1299 struct mac_biba *source, *dest; 1300 1301 source = SLOT(ifplabel); 1302 dest = SLOT(mlabel); 1303 1304 mac_biba_copy_effective(source, dest); 1305} 1306 1307static void 1308mac_biba_create_mbuf_multicast_encap(struct mbuf *m, struct label *mlabel, 1309 struct ifnet *ifp, struct label *ifplabel, struct mbuf *mnew, 1310 struct label *mnewlabel) 1311{ 1312 struct mac_biba *source, *dest; 1313 1314 source = SLOT(mlabel); 1315 dest = SLOT(mnewlabel); 1316 1317 mac_biba_copy_effective(source, dest); 1318} 1319 1320static void 1321mac_biba_create_mbuf_netlayer(struct mbuf *m, struct label *mlabel, 1322 struct mbuf *newm, struct label *mnewlabel) 1323{ 1324 struct mac_biba *source, *dest; 1325 1326 source = SLOT(mlabel); 1327 dest = SLOT(mnewlabel); 1328 1329 mac_biba_copy_effective(source, dest); 1330} 1331 1332static int 1333mac_biba_fragment_match(struct mbuf *m, struct label *mlabel, 1334 struct ipq *ipq, struct label *ipqlabel) 1335{ 1336 struct mac_biba *a, *b; 1337 1338 a = SLOT(ipqlabel); 1339 b = SLOT(mlabel); 1340 1341 return (mac_biba_equal_effective(a, b)); 1342} 1343 1344static void 1345mac_biba_relabel_ifnet(struct ucred *cred, struct ifnet *ifp, 1346 struct label *ifplabel, struct label *newlabel) 1347{ 1348 struct mac_biba *source, *dest; 1349 1350 source = SLOT(newlabel); 1351 dest = SLOT(ifplabel); 1352 1353 mac_biba_copy(source, dest); 1354} 1355 1356static void 1357mac_biba_update_ipq(struct mbuf *m, struct label *mlabel, struct ipq *ipq, 1358 struct label *ipqlabel) 1359{ 1360 1361 /* NOOP: we only accept matching labels, so no need to update */ 1362} 1363 1364static void 1365mac_biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1366 struct inpcb *inp, struct label *inplabel) 1367{ 1368 struct mac_biba *source, *dest; 1369 1370 source = SLOT(solabel); 1371 dest = SLOT(inplabel); 1372 1373 mac_biba_copy(source, dest); 1374} 1375 1376static void 1377mac_biba_create_mbuf_from_firewall(struct mbuf *m, struct label *label) 1378{ 1379 struct mac_biba *dest; 1380 1381 dest = SLOT(label); 1382 1383 /* XXX: where is the label for the firewall really comming from? */ 1384 mac_biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1385} 1386 1387/* 1388 * Labeling event operations: processes. 1389 */ 1390static void 1391mac_biba_create_proc0(struct ucred *cred) 1392{ 1393 struct mac_biba *dest; 1394 1395 dest = SLOT(cred->cr_label); 1396 1397 mac_biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1398 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1399 MAC_BIBA_TYPE_HIGH, 0, NULL); 1400} 1401 1402static void 1403mac_biba_create_proc1(struct ucred *cred) 1404{ 1405 struct mac_biba *dest; 1406 1407 dest = SLOT(cred->cr_label); 1408 1409 mac_biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1410 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1411 MAC_BIBA_TYPE_HIGH, 0, NULL); 1412} 1413 1414static void 1415mac_biba_relabel_cred(struct ucred *cred, struct label *newlabel) 1416{ 1417 struct mac_biba *source, *dest; 1418 1419 source = SLOT(newlabel); 1420 dest = SLOT(cred->cr_label); 1421 1422 mac_biba_copy(source, dest); 1423} 1424 1425/* 1426 * Label cleanup/flush operations 1427 */ 1428static void 1429mac_biba_cleanup_sysv_msgmsg(struct label *msglabel) 1430{ 1431 1432 bzero(SLOT(msglabel), sizeof(struct mac_biba)); 1433} 1434 1435static void 1436mac_biba_cleanup_sysv_msgqueue(struct label *msqlabel) 1437{ 1438 1439 bzero(SLOT(msqlabel), sizeof(struct mac_biba)); 1440} 1441 1442static void 1443mac_biba_cleanup_sysv_sem(struct label *semalabel) 1444{ 1445 1446 bzero(SLOT(semalabel), sizeof(struct mac_biba)); 1447} 1448 1449static void 1450mac_biba_cleanup_sysv_shm(struct label *shmlabel) 1451{ 1452 bzero(SLOT(shmlabel), sizeof(struct mac_biba)); 1453} 1454 1455/* 1456 * Access control checks. 1457 */ 1458static int 1459mac_biba_check_bpfdesc_receive(struct bpf_d *d, struct label *dlabel, 1460 struct ifnet *ifp, struct label *ifplabel) 1461{ 1462 struct mac_biba *a, *b; 1463 1464 if (!mac_biba_enabled) 1465 return (0); 1466 1467 a = SLOT(dlabel); 1468 b = SLOT(ifplabel); 1469 1470 if (mac_biba_equal_effective(a, b)) 1471 return (0); 1472 return (EACCES); 1473} 1474 1475static int 1476mac_biba_check_cred_relabel(struct ucred *cred, struct label *newlabel) 1477{ 1478 struct mac_biba *subj, *new; 1479 int error; 1480 1481 subj = SLOT(cred->cr_label); 1482 new = SLOT(newlabel); 1483 1484 /* 1485 * If there is a Biba label update for the credential, it may 1486 * be an update of the effective, range, or both. 1487 */ 1488 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1489 if (error) 1490 return (error); 1491 1492 /* 1493 * If the Biba label is to be changed, authorize as appropriate. 1494 */ 1495 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1496 /* 1497 * If the change request modifies both the Biba label 1498 * effective and range, check that the new effective will be 1499 * in the new range. 1500 */ 1501 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 1502 MAC_BIBA_FLAGS_BOTH && 1503 !mac_biba_effective_in_range(new, new)) 1504 return (EINVAL); 1505 1506 /* 1507 * To change the Biba effective label on a credential, the 1508 * new effective label must be in the current range. 1509 */ 1510 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && 1511 !mac_biba_effective_in_range(new, subj)) 1512 return (EPERM); 1513 1514 /* 1515 * To change the Biba range on a credential, the new 1516 * range label must be in the current range. 1517 */ 1518 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1519 !mac_biba_range_in_range(new, subj)) 1520 return (EPERM); 1521 1522 /* 1523 * To have EQUAL in any component of the new credential 1524 * Biba label, the subject must already have EQUAL in 1525 * their label. 1526 */ 1527 if (mac_biba_contains_equal(new)) { 1528 error = mac_biba_subject_privileged(subj); 1529 if (error) 1530 return (error); 1531 } 1532 } 1533 1534 return (0); 1535} 1536 1537static int 1538mac_biba_check_cred_visible(struct ucred *u1, struct ucred *u2) 1539{ 1540 struct mac_biba *subj, *obj; 1541 1542 if (!mac_biba_enabled) 1543 return (0); 1544 1545 subj = SLOT(u1->cr_label); 1546 obj = SLOT(u2->cr_label); 1547 1548 /* XXX: range */ 1549 if (!mac_biba_dominate_effective(obj, subj)) 1550 return (ESRCH); 1551 1552 return (0); 1553} 1554 1555static int 1556mac_biba_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1557 struct label *ifplabel, struct label *newlabel) 1558{ 1559 struct mac_biba *subj, *new; 1560 int error; 1561 1562 subj = SLOT(cred->cr_label); 1563 new = SLOT(newlabel); 1564 1565 /* 1566 * If there is a Biba label update for the interface, it may 1567 * be an update of the effective, range, or both. 1568 */ 1569 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1570 if (error) 1571 return (error); 1572 1573 /* 1574 * Relabling network interfaces requires Biba privilege. 1575 */ 1576 error = mac_biba_subject_privileged(subj); 1577 if (error) 1578 return (error); 1579 1580 return (0); 1581} 1582 1583static int 1584mac_biba_check_ifnet_transmit(struct ifnet *ifp, struct label *ifplabel, 1585 struct mbuf *m, struct label *mlabel) 1586{ 1587 struct mac_biba *p, *i; 1588 1589 if (!mac_biba_enabled) 1590 return (0); 1591 1592 p = SLOT(mlabel); 1593 i = SLOT(ifplabel); 1594 1595 return (mac_biba_effective_in_range(p, i) ? 0 : EACCES); 1596} 1597 1598static int 1599mac_biba_check_inpcb_deliver(struct inpcb *inp, struct label *inplabel, 1600 struct mbuf *m, struct label *mlabel) 1601{ 1602 struct mac_biba *p, *i; 1603 1604 if (!mac_biba_enabled) 1605 return (0); 1606 1607 p = SLOT(mlabel); 1608 i = SLOT(inplabel); 1609 1610 return (mac_biba_equal_effective(p, i) ? 0 : EACCES); 1611} 1612 1613static int 1614mac_biba_check_sysv_msgrcv(struct ucred *cred, struct msg *msgptr, 1615 struct label *msglabel) 1616{ 1617 struct mac_biba *subj, *obj; 1618 1619 if (!mac_biba_enabled) 1620 return (0); 1621 1622 subj = SLOT(cred->cr_label); 1623 obj = SLOT(msglabel); 1624 1625 if (!mac_biba_dominate_effective(obj, subj)) 1626 return (EACCES); 1627 1628 return (0); 1629} 1630 1631static int 1632mac_biba_check_sysv_msgrmid(struct ucred *cred, struct msg *msgptr, 1633 struct label *msglabel) 1634{ 1635 struct mac_biba *subj, *obj; 1636 1637 if (!mac_biba_enabled) 1638 return (0); 1639 1640 subj = SLOT(cred->cr_label); 1641 obj = SLOT(msglabel); 1642 1643 if (!mac_biba_dominate_effective(subj, obj)) 1644 return (EACCES); 1645 1646 return (0); 1647} 1648 1649static int 1650mac_biba_check_sysv_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, 1651 struct label *msqklabel) 1652{ 1653 struct mac_biba *subj, *obj; 1654 1655 if (!mac_biba_enabled) 1656 return (0); 1657 1658 subj = SLOT(cred->cr_label); 1659 obj = SLOT(msqklabel); 1660 1661 if (!mac_biba_dominate_effective(obj, subj)) 1662 return (EACCES); 1663 1664 return (0); 1665} 1666 1667static int 1668mac_biba_check_sysv_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, 1669 struct label *msqklabel) 1670{ 1671 struct mac_biba *subj, *obj; 1672 1673 if (!mac_biba_enabled) 1674 return (0); 1675 1676 subj = SLOT(cred->cr_label); 1677 obj = SLOT(msqklabel); 1678 1679 if (!mac_biba_dominate_effective(subj, obj)) 1680 return (EACCES); 1681 1682 return (0); 1683} 1684 1685static int 1686mac_biba_check_sysv_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, 1687 struct label *msqklabel) 1688{ 1689 struct mac_biba *subj, *obj; 1690 1691 if (!mac_biba_enabled) 1692 return (0); 1693 1694 subj = SLOT(cred->cr_label); 1695 obj = SLOT(msqklabel); 1696 1697 if (!mac_biba_dominate_effective(obj, subj)) 1698 return (EACCES); 1699 1700 return (0); 1701} 1702 1703 1704static int 1705mac_biba_check_sysv_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 1706 struct label *msqklabel, int cmd) 1707{ 1708 struct mac_biba *subj, *obj; 1709 1710 if (!mac_biba_enabled) 1711 return (0); 1712 1713 subj = SLOT(cred->cr_label); 1714 obj = SLOT(msqklabel); 1715 1716 switch(cmd) { 1717 case IPC_RMID: 1718 case IPC_SET: 1719 if (!mac_biba_dominate_effective(subj, obj)) 1720 return (EACCES); 1721 break; 1722 1723 case IPC_STAT: 1724 if (!mac_biba_dominate_effective(obj, subj)) 1725 return (EACCES); 1726 break; 1727 1728 default: 1729 return (EACCES); 1730 } 1731 1732 return (0); 1733} 1734 1735static int 1736mac_biba_check_sysv_semctl(struct ucred *cred, struct semid_kernel *semakptr, 1737 struct label *semaklabel, int cmd) 1738{ 1739 struct mac_biba *subj, *obj; 1740 1741 if (!mac_biba_enabled) 1742 return (0); 1743 1744 subj = SLOT(cred->cr_label); 1745 obj = SLOT(semaklabel); 1746 1747 switch(cmd) { 1748 case IPC_RMID: 1749 case IPC_SET: 1750 case SETVAL: 1751 case SETALL: 1752 if (!mac_biba_dominate_effective(subj, obj)) 1753 return (EACCES); 1754 break; 1755 1756 case IPC_STAT: 1757 case GETVAL: 1758 case GETPID: 1759 case GETNCNT: 1760 case GETZCNT: 1761 case GETALL: 1762 if (!mac_biba_dominate_effective(obj, subj)) 1763 return (EACCES); 1764 break; 1765 1766 default: 1767 return (EACCES); 1768 } 1769 1770 return (0); 1771} 1772 1773static int 1774mac_biba_check_sysv_semget(struct ucred *cred, struct semid_kernel *semakptr, 1775 struct label *semaklabel) 1776{ 1777 struct mac_biba *subj, *obj; 1778 1779 if (!mac_biba_enabled) 1780 return (0); 1781 1782 subj = SLOT(cred->cr_label); 1783 obj = SLOT(semaklabel); 1784 1785 if (!mac_biba_dominate_effective(obj, subj)) 1786 return (EACCES); 1787 1788 return (0); 1789} 1790 1791 1792static int 1793mac_biba_check_sysv_semop(struct ucred *cred, struct semid_kernel *semakptr, 1794 struct label *semaklabel, size_t accesstype) 1795{ 1796 struct mac_biba *subj, *obj; 1797 1798 if (!mac_biba_enabled) 1799 return (0); 1800 1801 subj = SLOT(cred->cr_label); 1802 obj = SLOT(semaklabel); 1803 1804 if (accesstype & SEM_R) 1805 if (!mac_biba_dominate_effective(obj, subj)) 1806 return (EACCES); 1807 1808 if (accesstype & SEM_A) 1809 if (!mac_biba_dominate_effective(subj, obj)) 1810 return (EACCES); 1811 1812 return (0); 1813} 1814 1815static int 1816mac_biba_check_sysv_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 1817 struct label *shmseglabel, int shmflg) 1818{ 1819 struct mac_biba *subj, *obj; 1820 1821 if (!mac_biba_enabled) 1822 return (0); 1823 1824 subj = SLOT(cred->cr_label); 1825 obj = SLOT(shmseglabel); 1826 1827 if (!mac_biba_dominate_effective(obj, subj)) 1828 return (EACCES); 1829 if ((shmflg & SHM_RDONLY) == 0) { 1830 if (!mac_biba_dominate_effective(subj, obj)) 1831 return (EACCES); 1832 } 1833 1834 return (0); 1835} 1836 1837static int 1838mac_biba_check_sysv_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 1839 struct label *shmseglabel, int cmd) 1840{ 1841 struct mac_biba *subj, *obj; 1842 1843 if (!mac_biba_enabled) 1844 return (0); 1845 1846 subj = SLOT(cred->cr_label); 1847 obj = SLOT(shmseglabel); 1848 1849 switch(cmd) { 1850 case IPC_RMID: 1851 case IPC_SET: 1852 if (!mac_biba_dominate_effective(subj, obj)) 1853 return (EACCES); 1854 break; 1855 1856 case IPC_STAT: 1857 case SHM_STAT: 1858 if (!mac_biba_dominate_effective(obj, subj)) 1859 return (EACCES); 1860 break; 1861 1862 default: 1863 return (EACCES); 1864 } 1865 1866 return (0); 1867} 1868 1869static int 1870mac_biba_check_sysv_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 1871 struct label *shmseglabel, int shmflg) 1872{ 1873 struct mac_biba *subj, *obj; 1874 1875 if (!mac_biba_enabled) 1876 return (0); 1877 1878 subj = SLOT(cred->cr_label); 1879 obj = SLOT(shmseglabel); 1880 1881 if (!mac_biba_dominate_effective(obj, subj)) 1882 return (EACCES); 1883 1884 return (0); 1885} 1886 1887static int 1888mac_biba_check_kld_load(struct ucred *cred, struct vnode *vp, 1889 struct label *vplabel) 1890{ 1891 struct mac_biba *subj, *obj; 1892 int error; 1893 1894 if (!mac_biba_enabled) 1895 return (0); 1896 1897 subj = SLOT(cred->cr_label); 1898 1899 error = mac_biba_subject_privileged(subj); 1900 if (error) 1901 return (error); 1902 1903 obj = SLOT(vplabel); 1904 if (!mac_biba_high_effective(obj)) 1905 return (EACCES); 1906 1907 return (0); 1908} 1909 1910static int 1911mac_biba_check_mount_stat(struct ucred *cred, struct mount *mp, 1912 struct label *mplabel) 1913{ 1914 struct mac_biba *subj, *obj; 1915 1916 if (!mac_biba_enabled) 1917 return (0); 1918 1919 subj = SLOT(cred->cr_label); 1920 obj = SLOT(mplabel); 1921 1922 if (!mac_biba_dominate_effective(obj, subj)) 1923 return (EACCES); 1924 1925 return (0); 1926} 1927 1928static int 1929mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipepair *pp, 1930 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1931{ 1932 1933 if(!mac_biba_enabled) 1934 return (0); 1935 1936 /* XXX: This will be implemented soon... */ 1937 1938 return (0); 1939} 1940 1941static int 1942mac_biba_check_pipe_poll(struct ucred *cred, struct pipepair *pp, 1943 struct label *pplabel) 1944{ 1945 struct mac_biba *subj, *obj; 1946 1947 if (!mac_biba_enabled) 1948 return (0); 1949 1950 subj = SLOT(cred->cr_label); 1951 obj = SLOT(pplabel); 1952 1953 if (!mac_biba_dominate_effective(obj, subj)) 1954 return (EACCES); 1955 1956 return (0); 1957} 1958 1959static int 1960mac_biba_check_pipe_read(struct ucred *cred, struct pipepair *pp, 1961 struct label *pplabel) 1962{ 1963 struct mac_biba *subj, *obj; 1964 1965 if (!mac_biba_enabled) 1966 return (0); 1967 1968 subj = SLOT(cred->cr_label); 1969 obj = SLOT(pplabel); 1970 1971 if (!mac_biba_dominate_effective(obj, subj)) 1972 return (EACCES); 1973 1974 return (0); 1975} 1976 1977static int 1978mac_biba_check_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1979 struct label *pplabel, struct label *newlabel) 1980{ 1981 struct mac_biba *subj, *obj, *new; 1982 int error; 1983 1984 new = SLOT(newlabel); 1985 subj = SLOT(cred->cr_label); 1986 obj = SLOT(pplabel); 1987 1988 /* 1989 * If there is a Biba label update for a pipe, it must be a 1990 * effective update. 1991 */ 1992 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 1993 if (error) 1994 return (error); 1995 1996 /* 1997 * To perform a relabel of a pipe (Biba label or not), Biba must 1998 * authorize the relabel. 1999 */ 2000 if (!mac_biba_effective_in_range(obj, subj)) 2001 return (EPERM); 2002 2003 /* 2004 * If the Biba label is to be changed, authorize as appropriate. 2005 */ 2006 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2007 /* 2008 * To change the Biba label on a pipe, the new pipe label 2009 * must be in the subject range. 2010 */ 2011 if (!mac_biba_effective_in_range(new, subj)) 2012 return (EPERM); 2013 2014 /* 2015 * To change the Biba label on a pipe to be EQUAL, the 2016 * subject must have appropriate privilege. 2017 */ 2018 if (mac_biba_contains_equal(new)) { 2019 error = mac_biba_subject_privileged(subj); 2020 if (error) 2021 return (error); 2022 } 2023 } 2024 2025 return (0); 2026} 2027 2028static int 2029mac_biba_check_pipe_stat(struct ucred *cred, struct pipepair *pp, 2030 struct label *pplabel) 2031{ 2032 struct mac_biba *subj, *obj; 2033 2034 if (!mac_biba_enabled) 2035 return (0); 2036 2037 subj = SLOT(cred->cr_label); 2038 obj = SLOT(pplabel); 2039 2040 if (!mac_biba_dominate_effective(obj, subj)) 2041 return (EACCES); 2042 2043 return (0); 2044} 2045 2046static int 2047mac_biba_check_pipe_write(struct ucred *cred, struct pipepair *pp, 2048 struct label *pplabel) 2049{ 2050 struct mac_biba *subj, *obj; 2051 2052 if (!mac_biba_enabled) 2053 return (0); 2054 2055 subj = SLOT(cred->cr_label); 2056 obj = SLOT(pplabel); 2057 2058 if (!mac_biba_dominate_effective(subj, obj)) 2059 return (EACCES); 2060 2061 return (0); 2062} 2063 2064static int 2065mac_biba_check_posix_sem_write(struct ucred *cred, struct ksem *ksemptr, 2066 struct label *ks_label) 2067{ 2068 struct mac_biba *subj, *obj; 2069 2070 if (!mac_biba_enabled) 2071 return (0); 2072 2073 subj = SLOT(cred->cr_label); 2074 obj = SLOT(ks_label); 2075 2076 if (!mac_biba_dominate_effective(subj, obj)) 2077 return (EACCES); 2078 2079 return (0); 2080} 2081 2082static int 2083mac_biba_check_posix_sem_rdonly(struct ucred *cred, struct ksem *ksemptr, 2084 struct label *ks_label) 2085{ 2086 struct mac_biba *subj, *obj; 2087 2088 if (!mac_biba_enabled) 2089 return (0); 2090 2091 subj = SLOT(cred->cr_label); 2092 obj = SLOT(ks_label); 2093 2094 if (!mac_biba_dominate_effective(obj, subj)) 2095 return (EACCES); 2096 2097 return (0); 2098} 2099 2100static int 2101mac_biba_check_proc_debug(struct ucred *cred, struct proc *p) 2102{ 2103 struct mac_biba *subj, *obj; 2104 2105 if (!mac_biba_enabled) 2106 return (0); 2107 2108 subj = SLOT(cred->cr_label); 2109 obj = SLOT(p->p_ucred->cr_label); 2110 2111 /* XXX: range checks */ 2112 if (!mac_biba_dominate_effective(obj, subj)) 2113 return (ESRCH); 2114 if (!mac_biba_dominate_effective(subj, obj)) 2115 return (EACCES); 2116 2117 return (0); 2118} 2119 2120static int 2121mac_biba_check_proc_sched(struct ucred *cred, struct proc *p) 2122{ 2123 struct mac_biba *subj, *obj; 2124 2125 if (!mac_biba_enabled) 2126 return (0); 2127 2128 subj = SLOT(cred->cr_label); 2129 obj = SLOT(p->p_ucred->cr_label); 2130 2131 /* XXX: range checks */ 2132 if (!mac_biba_dominate_effective(obj, subj)) 2133 return (ESRCH); 2134 if (!mac_biba_dominate_effective(subj, obj)) 2135 return (EACCES); 2136 2137 return (0); 2138} 2139 2140static int 2141mac_biba_check_proc_signal(struct ucred *cred, struct proc *p, int signum) 2142{ 2143 struct mac_biba *subj, *obj; 2144 2145 if (!mac_biba_enabled) 2146 return (0); 2147 2148 subj = SLOT(cred->cr_label); 2149 obj = SLOT(p->p_ucred->cr_label); 2150 2151 /* XXX: range checks */ 2152 if (!mac_biba_dominate_effective(obj, subj)) 2153 return (ESRCH); 2154 if (!mac_biba_dominate_effective(subj, obj)) 2155 return (EACCES); 2156 2157 return (0); 2158} 2159 2160static int 2161mac_biba_check_socket_deliver(struct socket *so, struct label *solabel, 2162 struct mbuf *m, struct label *mlabel) 2163{ 2164 struct mac_biba *p, *s; 2165 2166 if (!mac_biba_enabled) 2167 return (0); 2168 2169 p = SLOT(mlabel); 2170 s = SLOT(solabel); 2171 2172 return (mac_biba_equal_effective(p, s) ? 0 : EACCES); 2173} 2174 2175static int 2176mac_biba_check_socket_relabel(struct ucred *cred, struct socket *so, 2177 struct label *solabel, struct label *newlabel) 2178{ 2179 struct mac_biba *subj, *obj, *new; 2180 int error; 2181 2182 new = SLOT(newlabel); 2183 subj = SLOT(cred->cr_label); 2184 obj = SLOT(solabel); 2185 2186 /* 2187 * If there is a Biba label update for the socket, it may be 2188 * an update of effective. 2189 */ 2190 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2191 if (error) 2192 return (error); 2193 2194 /* 2195 * To relabel a socket, the old socket effective must be in the subject 2196 * range. 2197 */ 2198 if (!mac_biba_effective_in_range(obj, subj)) 2199 return (EPERM); 2200 2201 /* 2202 * If the Biba label is to be changed, authorize as appropriate. 2203 */ 2204 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2205 /* 2206 * To relabel a socket, the new socket effective must be in 2207 * the subject range. 2208 */ 2209 if (!mac_biba_effective_in_range(new, subj)) 2210 return (EPERM); 2211 2212 /* 2213 * To change the Biba label on the socket to contain EQUAL, 2214 * the subject must have appropriate privilege. 2215 */ 2216 if (mac_biba_contains_equal(new)) { 2217 error = mac_biba_subject_privileged(subj); 2218 if (error) 2219 return (error); 2220 } 2221 } 2222 2223 return (0); 2224} 2225 2226static int 2227mac_biba_check_socket_visible(struct ucred *cred, struct socket *so, 2228 struct label *solabel) 2229{ 2230 struct mac_biba *subj, *obj; 2231 2232 if (!mac_biba_enabled) 2233 return (0); 2234 2235 subj = SLOT(cred->cr_label); 2236 obj = SLOT(solabel); 2237 2238 if (!mac_biba_dominate_effective(obj, subj)) 2239 return (ENOENT); 2240 2241 return (0); 2242} 2243 2244/* 2245 * Some system privileges are allowed regardless of integrity grade; others 2246 * are allowed only when running with privilege with respect to the Biba 2247 * policy as they might otherwise allow bypassing of the integrity policy. 2248 */ 2249static int 2250mac_biba_priv_check(struct ucred *cred, int priv) 2251{ 2252 struct mac_biba *subj; 2253 int error; 2254 2255 if (!mac_biba_enabled) 2256 return (0); 2257 2258 /* 2259 * Exempt only specific privileges from the Biba integrity policy. 2260 */ 2261 switch (priv) { 2262 case PRIV_KTRACE: 2263 case PRIV_MSGBUF: 2264 2265 /* 2266 * Allow processes to manipulate basic process audit properties, and 2267 * to submit audit records. 2268 */ 2269 case PRIV_AUDIT_GETAUDIT: 2270 case PRIV_AUDIT_SETAUDIT: 2271 case PRIV_AUDIT_SUBMIT: 2272 2273 /* 2274 * Allow processes to manipulate their regular UNIX credentials. 2275 */ 2276 case PRIV_CRED_SETUID: 2277 case PRIV_CRED_SETEUID: 2278 case PRIV_CRED_SETGID: 2279 case PRIV_CRED_SETEGID: 2280 case PRIV_CRED_SETGROUPS: 2281 case PRIV_CRED_SETREUID: 2282 case PRIV_CRED_SETREGID: 2283 case PRIV_CRED_SETRESUID: 2284 case PRIV_CRED_SETRESGID: 2285 2286 /* 2287 * Allow processes to perform system monitoring. 2288 */ 2289 case PRIV_SEEOTHERGIDS: 2290 case PRIV_SEEOTHERUIDS: 2291 break; 2292 2293 /* 2294 * Allow access to general process debugging facilities. We 2295 * separately control debugging based on MAC label. 2296 */ 2297 case PRIV_DEBUG_DIFFCRED: 2298 case PRIV_DEBUG_SUGID: 2299 case PRIV_DEBUG_UNPRIV: 2300 2301 /* 2302 * Allow manipulating jails. 2303 */ 2304 case PRIV_JAIL_ATTACH: 2305 2306 /* 2307 * Allow privilege with respect to the Partition policy, but not the 2308 * Privs policy. 2309 */ 2310 case PRIV_MAC_PARTITION: 2311 2312 /* 2313 * Allow privilege with respect to process resource limits and login 2314 * context. 2315 */ 2316 case PRIV_PROC_LIMIT: 2317 case PRIV_PROC_SETLOGIN: 2318 case PRIV_PROC_SETRLIMIT: 2319 2320 /* 2321 * Allow System V and POSIX IPC privileges. 2322 */ 2323 case PRIV_IPC_READ: 2324 case PRIV_IPC_WRITE: 2325 case PRIV_IPC_ADMIN: 2326 case PRIV_IPC_MSGSIZE: 2327 case PRIV_MQ_ADMIN: 2328 2329 /* 2330 * Allow certain scheduler manipulations -- possibly this should be 2331 * controlled by more fine-grained policy, as potentially low 2332 * integrity processes can deny CPU to higher integrity ones. 2333 */ 2334 case PRIV_SCHED_DIFFCRED: 2335 case PRIV_SCHED_SETPRIORITY: 2336 case PRIV_SCHED_RTPRIO: 2337 case PRIV_SCHED_SETPOLICY: 2338 case PRIV_SCHED_SET: 2339 case PRIV_SCHED_SETPARAM: 2340 2341 /* 2342 * More IPC privileges. 2343 */ 2344 case PRIV_SEM_WRITE: 2345 2346 /* 2347 * Allow signaling privileges subject to integrity policy. 2348 */ 2349 case PRIV_SIGNAL_DIFFCRED: 2350 case PRIV_SIGNAL_SUGID: 2351 2352 /* 2353 * Allow access to only limited sysctls from lower integrity levels; 2354 * piggy-back on the Jail definition. 2355 */ 2356 case PRIV_SYSCTL_WRITEJAIL: 2357 2358 /* 2359 * Allow TTY-based privileges, subject to general device access using 2360 * labels on TTY device nodes, but not console privilege. 2361 */ 2362 case PRIV_TTY_DRAINWAIT: 2363 case PRIV_TTY_DTRWAIT: 2364 case PRIV_TTY_EXCLUSIVE: 2365 case PRIV_TTY_PRISON: 2366 case PRIV_TTY_STI: 2367 case PRIV_TTY_SETA: 2368 2369 /* 2370 * Grant most VFS privileges, as almost all are in practice bounded 2371 * by more specific checks using labels. 2372 */ 2373 case PRIV_VFS_READ: 2374 case PRIV_VFS_WRITE: 2375 case PRIV_VFS_ADMIN: 2376 case PRIV_VFS_EXEC: 2377 case PRIV_VFS_LOOKUP: 2378 case PRIV_VFS_CHFLAGS_DEV: 2379 case PRIV_VFS_CHOWN: 2380 case PRIV_VFS_CHROOT: 2381 case PRIV_VFS_RETAINSUGID: 2382 case PRIV_VFS_EXCEEDQUOTA: 2383 case PRIV_VFS_FCHROOT: 2384 case PRIV_VFS_FHOPEN: 2385 case PRIV_VFS_FHSTATFS: 2386 case PRIV_VFS_GENERATION: 2387 case PRIV_VFS_GETFH: 2388 case PRIV_VFS_GETQUOTA: 2389 case PRIV_VFS_LINK: 2390 case PRIV_VFS_MOUNT: 2391 case PRIV_VFS_MOUNT_OWNER: 2392 case PRIV_VFS_MOUNT_PERM: 2393 case PRIV_VFS_MOUNT_SUIDDIR: 2394 case PRIV_VFS_MOUNT_NONUSER: 2395 case PRIV_VFS_SETGID: 2396 case PRIV_VFS_STICKYFILE: 2397 case PRIV_VFS_SYSFLAGS: 2398 case PRIV_VFS_UNMOUNT: 2399 2400 /* 2401 * Allow VM privileges; it would be nice if these were subject to 2402 * resource limits. 2403 */ 2404 case PRIV_VM_MADV_PROTECT: 2405 case PRIV_VM_MLOCK: 2406 case PRIV_VM_MUNLOCK: 2407 2408 /* 2409 * Allow some but not all network privileges. In general, dont allow 2410 * reconfiguring the network stack, just normal use. 2411 */ 2412 case PRIV_NETATALK_RESERVEDPORT: 2413 case PRIV_NETINET_RESERVEDPORT: 2414 case PRIV_NETINET_RAW: 2415 case PRIV_NETINET_REUSEPORT: 2416 case PRIV_NETIPX_RESERVEDPORT: 2417 case PRIV_NETIPX_RAW: 2418 break; 2419 2420 /* 2421 * All remaining system privileges are allow only if the process 2422 * holds privilege with respect to the Biba policy. 2423 */ 2424 default: 2425 subj = SLOT(cred->cr_label); 2426 error = mac_biba_subject_privileged(subj); 2427 if (error) 2428 return (error); 2429 } 2430 return (0); 2431} 2432 2433static int 2434mac_biba_check_system_acct(struct ucred *cred, struct vnode *vp, 2435 struct label *vplabel) 2436{ 2437 struct mac_biba *subj, *obj; 2438 int error; 2439 2440 if (!mac_biba_enabled) 2441 return (0); 2442 2443 subj = SLOT(cred->cr_label); 2444 2445 error = mac_biba_subject_privileged(subj); 2446 if (error) 2447 return (error); 2448 2449 if (vplabel == NULL) 2450 return (0); 2451 2452 obj = SLOT(vplabel); 2453 if (!mac_biba_high_effective(obj)) 2454 return (EACCES); 2455 2456 return (0); 2457} 2458 2459static int 2460mac_biba_check_system_auditctl(struct ucred *cred, struct vnode *vp, 2461 struct label *vplabel) 2462{ 2463 struct mac_biba *subj, *obj; 2464 int error; 2465 2466 if (!mac_biba_enabled) 2467 return (0); 2468 2469 subj = SLOT(cred->cr_label); 2470 2471 error = mac_biba_subject_privileged(subj); 2472 if (error) 2473 return (error); 2474 2475 if (vplabel == NULL) 2476 return (0); 2477 2478 obj = SLOT(vplabel); 2479 if (!mac_biba_high_effective(obj)) 2480 return (EACCES); 2481 2482 return (0); 2483} 2484 2485static int 2486mac_biba_check_system_auditon(struct ucred *cred, int cmd) 2487{ 2488 struct mac_biba *subj; 2489 int error; 2490 2491 if (!mac_biba_enabled) 2492 return (0); 2493 2494 subj = SLOT(cred->cr_label); 2495 2496 error = mac_biba_subject_privileged(subj); 2497 if (error) 2498 return (error); 2499 2500 return (0); 2501} 2502 2503static int 2504mac_biba_check_system_swapon(struct ucred *cred, struct vnode *vp, 2505 struct label *vplabel) 2506{ 2507 struct mac_biba *subj, *obj; 2508 int error; 2509 2510 if (!mac_biba_enabled) 2511 return (0); 2512 2513 subj = SLOT(cred->cr_label); 2514 obj = SLOT(vplabel); 2515 2516 error = mac_biba_subject_privileged(subj); 2517 if (error) 2518 return (error); 2519 2520 if (!mac_biba_high_effective(obj)) 2521 return (EACCES); 2522 2523 return (0); 2524} 2525 2526static int 2527mac_biba_check_system_swapoff(struct ucred *cred, struct vnode *vp, 2528 struct label *label) 2529{ 2530 struct mac_biba *subj; 2531 int error; 2532 2533 if (!mac_biba_enabled) 2534 return (0); 2535 2536 subj = SLOT(cred->cr_label); 2537 2538 error = mac_biba_subject_privileged(subj); 2539 if (error) 2540 return (error); 2541 2542 return (0); 2543} 2544 2545static int 2546mac_biba_check_system_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2547 void *arg1, int arg2, struct sysctl_req *req) 2548{ 2549 struct mac_biba *subj; 2550 int error; 2551 2552 if (!mac_biba_enabled) 2553 return (0); 2554 2555 subj = SLOT(cred->cr_label); 2556 2557 /* 2558 * Treat sysctl variables without CTLFLAG_ANYBODY flag as 2559 * biba/high, but also require privilege to change them. 2560 */ 2561 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2562 if (!mac_biba_subject_dominate_high(subj)) 2563 return (EACCES); 2564 2565 error = mac_biba_subject_privileged(subj); 2566 if (error) 2567 return (error); 2568 } 2569 2570 return (0); 2571} 2572 2573static int 2574mac_biba_check_vnode_chdir(struct ucred *cred, struct vnode *dvp, 2575 struct label *dvplabel) 2576{ 2577 struct mac_biba *subj, *obj; 2578 2579 if (!mac_biba_enabled) 2580 return (0); 2581 2582 subj = SLOT(cred->cr_label); 2583 obj = SLOT(dvplabel); 2584 2585 if (!mac_biba_dominate_effective(obj, subj)) 2586 return (EACCES); 2587 2588 return (0); 2589} 2590 2591static int 2592mac_biba_check_vnode_chroot(struct ucred *cred, struct vnode *dvp, 2593 struct label *dvplabel) 2594{ 2595 struct mac_biba *subj, *obj; 2596 2597 if (!mac_biba_enabled) 2598 return (0); 2599 2600 subj = SLOT(cred->cr_label); 2601 obj = SLOT(dvplabel); 2602 2603 if (!mac_biba_dominate_effective(obj, subj)) 2604 return (EACCES); 2605 2606 return (0); 2607} 2608 2609static int 2610mac_biba_check_vnode_create(struct ucred *cred, struct vnode *dvp, 2611 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2612{ 2613 struct mac_biba *subj, *obj; 2614 2615 if (!mac_biba_enabled) 2616 return (0); 2617 2618 subj = SLOT(cred->cr_label); 2619 obj = SLOT(dvplabel); 2620 2621 if (!mac_biba_dominate_effective(subj, obj)) 2622 return (EACCES); 2623 2624 return (0); 2625} 2626 2627static int 2628mac_biba_check_vnode_delete(struct ucred *cred, struct vnode *dvp, 2629 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2630 struct componentname *cnp) 2631{ 2632 struct mac_biba *subj, *obj; 2633 2634 if (!mac_biba_enabled) 2635 return (0); 2636 2637 subj = SLOT(cred->cr_label); 2638 obj = SLOT(dvplabel); 2639 2640 if (!mac_biba_dominate_effective(subj, obj)) 2641 return (EACCES); 2642 2643 obj = SLOT(vplabel); 2644 2645 if (!mac_biba_dominate_effective(subj, obj)) 2646 return (EACCES); 2647 2648 return (0); 2649} 2650 2651static int 2652mac_biba_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 2653 struct label *vplabel, acl_type_t type) 2654{ 2655 struct mac_biba *subj, *obj; 2656 2657 if (!mac_biba_enabled) 2658 return (0); 2659 2660 subj = SLOT(cred->cr_label); 2661 obj = SLOT(vplabel); 2662 2663 if (!mac_biba_dominate_effective(subj, obj)) 2664 return (EACCES); 2665 2666 return (0); 2667} 2668 2669static int 2670mac_biba_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp, 2671 struct label *vplabel, int attrnamespace, const char *name) 2672{ 2673 struct mac_biba *subj, *obj; 2674 2675 if (!mac_biba_enabled) 2676 return (0); 2677 2678 subj = SLOT(cred->cr_label); 2679 obj = SLOT(vplabel); 2680 2681 if (!mac_biba_dominate_effective(subj, obj)) 2682 return (EACCES); 2683 2684 return (0); 2685} 2686 2687static int 2688mac_biba_check_vnode_exec(struct ucred *cred, struct vnode *vp, 2689 struct label *vplabel, struct image_params *imgp, 2690 struct label *execlabel) 2691{ 2692 struct mac_biba *subj, *obj, *exec; 2693 int error; 2694 2695 if (execlabel != NULL) { 2696 /* 2697 * We currently don't permit labels to be changed at 2698 * exec-time as part of Biba, so disallow non-NULL 2699 * Biba label elements in the execlabel. 2700 */ 2701 exec = SLOT(execlabel); 2702 error = biba_atmostflags(exec, 0); 2703 if (error) 2704 return (error); 2705 } 2706 2707 if (!mac_biba_enabled) 2708 return (0); 2709 2710 subj = SLOT(cred->cr_label); 2711 obj = SLOT(vplabel); 2712 2713 if (!mac_biba_dominate_effective(obj, subj)) 2714 return (EACCES); 2715 2716 return (0); 2717} 2718 2719static int 2720mac_biba_check_vnode_getacl(struct ucred *cred, struct vnode *vp, 2721 struct label *vplabel, acl_type_t type) 2722{ 2723 struct mac_biba *subj, *obj; 2724 2725 if (!mac_biba_enabled) 2726 return (0); 2727 2728 subj = SLOT(cred->cr_label); 2729 obj = SLOT(vplabel); 2730 2731 if (!mac_biba_dominate_effective(obj, subj)) 2732 return (EACCES); 2733 2734 return (0); 2735} 2736 2737static int 2738mac_biba_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 2739 struct label *vplabel, int attrnamespace, const char *name, 2740 struct uio *uio) 2741{ 2742 struct mac_biba *subj, *obj; 2743 2744 if (!mac_biba_enabled) 2745 return (0); 2746 2747 subj = SLOT(cred->cr_label); 2748 obj = SLOT(vplabel); 2749 2750 if (!mac_biba_dominate_effective(obj, subj)) 2751 return (EACCES); 2752 2753 return (0); 2754} 2755 2756static int 2757mac_biba_check_vnode_link(struct ucred *cred, struct vnode *dvp, 2758 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2759 struct componentname *cnp) 2760{ 2761 struct mac_biba *subj, *obj; 2762 2763 if (!mac_biba_enabled) 2764 return (0); 2765 2766 subj = SLOT(cred->cr_label); 2767 obj = SLOT(dvplabel); 2768 2769 if (!mac_biba_dominate_effective(subj, obj)) 2770 return (EACCES); 2771 2772 obj = SLOT(vplabel); 2773 2774 if (!mac_biba_dominate_effective(subj, obj)) 2775 return (EACCES); 2776 2777 return (0); 2778} 2779 2780static int 2781mac_biba_check_vnode_listextattr(struct ucred *cred, struct vnode *vp, 2782 struct label *vplabel, int attrnamespace) 2783{ 2784 struct mac_biba *subj, *obj; 2785 2786 if (!mac_biba_enabled) 2787 return (0); 2788 2789 subj = SLOT(cred->cr_label); 2790 obj = SLOT(vplabel); 2791 2792 if (!mac_biba_dominate_effective(obj, subj)) 2793 return (EACCES); 2794 2795 return (0); 2796} 2797 2798static int 2799mac_biba_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 2800 struct label *dvplabel, struct componentname *cnp) 2801{ 2802 struct mac_biba *subj, *obj; 2803 2804 if (!mac_biba_enabled) 2805 return (0); 2806 2807 subj = SLOT(cred->cr_label); 2808 obj = SLOT(dvplabel); 2809 2810 if (!mac_biba_dominate_effective(obj, subj)) 2811 return (EACCES); 2812 2813 return (0); 2814} 2815 2816static int 2817mac_biba_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 2818 struct label *vplabel, int prot, int flags) 2819{ 2820 struct mac_biba *subj, *obj; 2821 2822 /* 2823 * Rely on the use of open()-time protections to handle 2824 * non-revocation cases. 2825 */ 2826 if (!mac_biba_enabled || !revocation_enabled) 2827 return (0); 2828 2829 subj = SLOT(cred->cr_label); 2830 obj = SLOT(vplabel); 2831 2832 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2833 if (!mac_biba_dominate_effective(obj, subj)) 2834 return (EACCES); 2835 } 2836 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2837 if (!mac_biba_dominate_effective(subj, obj)) 2838 return (EACCES); 2839 } 2840 2841 return (0); 2842} 2843 2844static int 2845mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp, 2846 struct label *vplabel, int acc_mode) 2847{ 2848 struct mac_biba *subj, *obj; 2849 2850 if (!mac_biba_enabled) 2851 return (0); 2852 2853 subj = SLOT(cred->cr_label); 2854 obj = SLOT(vplabel); 2855 2856 /* XXX privilege override for admin? */ 2857 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2858 if (!mac_biba_dominate_effective(obj, subj)) 2859 return (EACCES); 2860 } 2861 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2862 if (!mac_biba_dominate_effective(subj, obj)) 2863 return (EACCES); 2864 } 2865 2866 return (0); 2867} 2868 2869static int 2870mac_biba_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 2871 struct vnode *vp, struct label *vplabel) 2872{ 2873 struct mac_biba *subj, *obj; 2874 2875 if (!mac_biba_enabled || !revocation_enabled) 2876 return (0); 2877 2878 subj = SLOT(active_cred->cr_label); 2879 obj = SLOT(vplabel); 2880 2881 if (!mac_biba_dominate_effective(obj, subj)) 2882 return (EACCES); 2883 2884 return (0); 2885} 2886 2887static int 2888mac_biba_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 2889 struct vnode *vp, struct label *vplabel) 2890{ 2891 struct mac_biba *subj, *obj; 2892 2893 if (!mac_biba_enabled || !revocation_enabled) 2894 return (0); 2895 2896 subj = SLOT(active_cred->cr_label); 2897 obj = SLOT(vplabel); 2898 2899 if (!mac_biba_dominate_effective(obj, subj)) 2900 return (EACCES); 2901 2902 return (0); 2903} 2904 2905static int 2906mac_biba_check_vnode_readdir(struct ucred *cred, struct vnode *dvp, 2907 struct label *dvplabel) 2908{ 2909 struct mac_biba *subj, *obj; 2910 2911 if (!mac_biba_enabled) 2912 return (0); 2913 2914 subj = SLOT(cred->cr_label); 2915 obj = SLOT(dvplabel); 2916 2917 if (!mac_biba_dominate_effective(obj, subj)) 2918 return (EACCES); 2919 2920 return (0); 2921} 2922 2923static int 2924mac_biba_check_vnode_readlink(struct ucred *cred, struct vnode *vp, 2925 struct label *vplabel) 2926{ 2927 struct mac_biba *subj, *obj; 2928 2929 if (!mac_biba_enabled) 2930 return (0); 2931 2932 subj = SLOT(cred->cr_label); 2933 obj = SLOT(vplabel); 2934 2935 if (!mac_biba_dominate_effective(obj, subj)) 2936 return (EACCES); 2937 2938 return (0); 2939} 2940 2941static int 2942mac_biba_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 2943 struct label *vplabel, struct label *newlabel) 2944{ 2945 struct mac_biba *old, *new, *subj; 2946 int error; 2947 2948 old = SLOT(vplabel); 2949 new = SLOT(newlabel); 2950 subj = SLOT(cred->cr_label); 2951 2952 /* 2953 * If there is a Biba label update for the vnode, it must be a 2954 * effective label. 2955 */ 2956 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); 2957 if (error) 2958 return (error); 2959 2960 /* 2961 * To perform a relabel of the vnode (Biba label or not), Biba must 2962 * authorize the relabel. 2963 */ 2964 if (!mac_biba_effective_in_range(old, subj)) 2965 return (EPERM); 2966 2967 /* 2968 * If the Biba label is to be changed, authorize as appropriate. 2969 */ 2970 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { 2971 /* 2972 * To change the Biba label on a vnode, the new vnode label 2973 * must be in the subject range. 2974 */ 2975 if (!mac_biba_effective_in_range(new, subj)) 2976 return (EPERM); 2977 2978 /* 2979 * To change the Biba label on the vnode to be EQUAL, 2980 * the subject must have appropriate privilege. 2981 */ 2982 if (mac_biba_contains_equal(new)) { 2983 error = mac_biba_subject_privileged(subj); 2984 if (error) 2985 return (error); 2986 } 2987 } 2988 2989 return (0); 2990} 2991 2992static int 2993mac_biba_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 2994 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2995 struct componentname *cnp) 2996{ 2997 struct mac_biba *subj, *obj; 2998 2999 if (!mac_biba_enabled) 3000 return (0); 3001 3002 subj = SLOT(cred->cr_label); 3003 obj = SLOT(dvplabel); 3004 3005 if (!mac_biba_dominate_effective(subj, obj)) 3006 return (EACCES); 3007 3008 obj = SLOT(vplabel); 3009 3010 if (!mac_biba_dominate_effective(subj, obj)) 3011 return (EACCES); 3012 3013 return (0); 3014} 3015 3016static int 3017mac_biba_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 3018 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 3019 int samedir, struct componentname *cnp) 3020{ 3021 struct mac_biba *subj, *obj; 3022 3023 if (!mac_biba_enabled) 3024 return (0); 3025 3026 subj = SLOT(cred->cr_label); 3027 obj = SLOT(dvplabel); 3028 3029 if (!mac_biba_dominate_effective(subj, obj)) 3030 return (EACCES); 3031 3032 if (vp != NULL) { 3033 obj = SLOT(vplabel); 3034 3035 if (!mac_biba_dominate_effective(subj, obj)) 3036 return (EACCES); 3037 } 3038 3039 return (0); 3040} 3041 3042static int 3043mac_biba_check_vnode_revoke(struct ucred *cred, struct vnode *vp, 3044 struct label *vplabel) 3045{ 3046 struct mac_biba *subj, *obj; 3047 3048 if (!mac_biba_enabled) 3049 return (0); 3050 3051 subj = SLOT(cred->cr_label); 3052 obj = SLOT(vplabel); 3053 3054 if (!mac_biba_dominate_effective(subj, obj)) 3055 return (EACCES); 3056 3057 return (0); 3058} 3059 3060static int 3061mac_biba_check_vnode_setacl(struct ucred *cred, struct vnode *vp, 3062 struct label *vplabel, acl_type_t type, struct acl *acl) 3063{ 3064 struct mac_biba *subj, *obj; 3065 3066 if (!mac_biba_enabled) 3067 return (0); 3068 3069 subj = SLOT(cred->cr_label); 3070 obj = SLOT(vplabel); 3071 3072 if (!mac_biba_dominate_effective(subj, obj)) 3073 return (EACCES); 3074 3075 return (0); 3076} 3077 3078static int 3079mac_biba_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 3080 struct label *vplabel, int attrnamespace, const char *name, 3081 struct uio *uio) 3082{ 3083 struct mac_biba *subj, *obj; 3084 3085 if (!mac_biba_enabled) 3086 return (0); 3087 3088 subj = SLOT(cred->cr_label); 3089 obj = SLOT(vplabel); 3090 3091 if (!mac_biba_dominate_effective(subj, obj)) 3092 return (EACCES); 3093 3094 /* XXX: protect the MAC EA in a special way? */ 3095 3096 return (0); 3097} 3098 3099static int 3100mac_biba_check_vnode_setflags(struct ucred *cred, struct vnode *vp, 3101 struct label *vplabel, u_long flags) 3102{ 3103 struct mac_biba *subj, *obj; 3104 3105 if (!mac_biba_enabled) 3106 return (0); 3107 3108 subj = SLOT(cred->cr_label); 3109 obj = SLOT(vplabel); 3110 3111 if (!mac_biba_dominate_effective(subj, obj)) 3112 return (EACCES); 3113 3114 return (0); 3115} 3116 3117static int 3118mac_biba_check_vnode_setmode(struct ucred *cred, struct vnode *vp, 3119 struct label *vplabel, mode_t mode) 3120{ 3121 struct mac_biba *subj, *obj; 3122 3123 if (!mac_biba_enabled) 3124 return (0); 3125 3126 subj = SLOT(cred->cr_label); 3127 obj = SLOT(vplabel); 3128 3129 if (!mac_biba_dominate_effective(subj, obj)) 3130 return (EACCES); 3131 3132 return (0); 3133} 3134 3135static int 3136mac_biba_check_vnode_setowner(struct ucred *cred, struct vnode *vp, 3137 struct label *vplabel, uid_t uid, gid_t gid) 3138{ 3139 struct mac_biba *subj, *obj; 3140 3141 if (!mac_biba_enabled) 3142 return (0); 3143 3144 subj = SLOT(cred->cr_label); 3145 obj = SLOT(vplabel); 3146 3147 if (!mac_biba_dominate_effective(subj, obj)) 3148 return (EACCES); 3149 3150 return (0); 3151} 3152 3153static int 3154mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 3155 struct label *vplabel, struct timespec atime, struct timespec mtime) 3156{ 3157 struct mac_biba *subj, *obj; 3158 3159 if (!mac_biba_enabled) 3160 return (0); 3161 3162 subj = SLOT(cred->cr_label); 3163 obj = SLOT(vplabel); 3164 3165 if (!mac_biba_dominate_effective(subj, obj)) 3166 return (EACCES); 3167 3168 return (0); 3169} 3170 3171static int 3172mac_biba_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 3173 struct vnode *vp, struct label *vplabel) 3174{ 3175 struct mac_biba *subj, *obj; 3176 3177 if (!mac_biba_enabled) 3178 return (0); 3179 3180 subj = SLOT(active_cred->cr_label); 3181 obj = SLOT(vplabel); 3182 3183 if (!mac_biba_dominate_effective(obj, subj)) 3184 return (EACCES); 3185 3186 return (0); 3187} 3188 3189static int 3190mac_biba_check_vnode_write(struct ucred *active_cred, 3191 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 3192{ 3193 struct mac_biba *subj, *obj; 3194 3195 if (!mac_biba_enabled || !revocation_enabled) 3196 return (0); 3197 3198 subj = SLOT(active_cred->cr_label); 3199 obj = SLOT(vplabel); 3200 3201 if (!mac_biba_dominate_effective(subj, obj)) 3202 return (EACCES); 3203 3204 return (0); 3205} 3206 3207static void 3208mac_biba_associate_nfsd_label(struct ucred *cred) 3209{ 3210 struct mac_biba *label; 3211 3212 label = SLOT(cred->cr_label); 3213 mac_biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); 3214 mac_biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, 3215 MAC_BIBA_TYPE_HIGH, 0, NULL); 3216} 3217 3218static void 3219mac_biba_init_syncache_from_inpcb(struct label *label, struct inpcb *inp) 3220{ 3221 struct mac_biba *source, *dest; 3222 3223 source = SLOT(inp->inp_label); 3224 dest = SLOT(label); 3225 mac_biba_copy_effective(source, dest); 3226} 3227 3228static void 3229mac_biba_create_mbuf_from_syncache(struct label *sc_label, struct mbuf *m, 3230 struct label *mlabel) 3231{ 3232 struct mac_biba *source, *dest; 3233 3234 source = SLOT(sc_label); 3235 dest = SLOT(mlabel); 3236 mac_biba_copy_effective(source, dest); 3237} 3238 3239static struct mac_policy_ops mac_biba_ops = 3240{ 3241 .mpo_init = mac_biba_init, 3242 .mpo_init_bpfdesc_label = mac_biba_init_label, 3243 .mpo_init_cred_label = mac_biba_init_label, 3244 .mpo_init_devfsdirent_label = mac_biba_init_label, 3245 .mpo_init_ifnet_label = mac_biba_init_label, 3246 .mpo_init_inpcb_label = mac_biba_init_label_waitcheck, 3247 .mpo_init_syncache_label = mac_biba_init_label_waitcheck, 3248 .mpo_init_sysv_msgmsg_label = mac_biba_init_label, 3249 .mpo_init_sysv_msgqueue_label = mac_biba_init_label, 3250 .mpo_init_sysv_sem_label = mac_biba_init_label, 3251 .mpo_init_sysv_shm_label = mac_biba_init_label, 3252 .mpo_init_ipq_label = mac_biba_init_label_waitcheck, 3253 .mpo_init_mbuf_label = mac_biba_init_label_waitcheck, 3254 .mpo_init_mount_label = mac_biba_init_label, 3255 .mpo_init_pipe_label = mac_biba_init_label, 3256 .mpo_init_posix_sem_label = mac_biba_init_label, 3257 .mpo_init_socket_label = mac_biba_init_label_waitcheck, 3258 .mpo_init_socket_peer_label = mac_biba_init_label_waitcheck, 3259 .mpo_init_syncache_from_inpcb = mac_biba_init_syncache_from_inpcb, 3260 .mpo_init_vnode_label = mac_biba_init_label, 3261 .mpo_destroy_bpfdesc_label = mac_biba_destroy_label, 3262 .mpo_destroy_cred_label = mac_biba_destroy_label, 3263 .mpo_destroy_devfsdirent_label = mac_biba_destroy_label, 3264 .mpo_destroy_ifnet_label = mac_biba_destroy_label, 3265 .mpo_destroy_inpcb_label = mac_biba_destroy_label, 3266 .mpo_destroy_syncache_label = mac_biba_destroy_label, 3267 .mpo_destroy_sysv_msgmsg_label = mac_biba_destroy_label, 3268 .mpo_destroy_sysv_msgqueue_label = mac_biba_destroy_label, 3269 .mpo_destroy_sysv_sem_label = mac_biba_destroy_label, 3270 .mpo_destroy_sysv_shm_label = mac_biba_destroy_label, 3271 .mpo_destroy_ipq_label = mac_biba_destroy_label, 3272 .mpo_destroy_mbuf_label = mac_biba_destroy_label, 3273 .mpo_destroy_mount_label = mac_biba_destroy_label, 3274 .mpo_destroy_pipe_label = mac_biba_destroy_label, 3275 .mpo_destroy_posix_sem_label = mac_biba_destroy_label, 3276 .mpo_destroy_socket_label = mac_biba_destroy_label, 3277 .mpo_destroy_socket_peer_label = mac_biba_destroy_label, 3278 .mpo_destroy_vnode_label = mac_biba_destroy_label, 3279 .mpo_copy_cred_label = mac_biba_copy_label, 3280 .mpo_copy_ifnet_label = mac_biba_copy_label, 3281 .mpo_copy_mbuf_label = mac_biba_copy_label, 3282 .mpo_copy_pipe_label = mac_biba_copy_label, 3283 .mpo_copy_socket_label = mac_biba_copy_label, 3284 .mpo_copy_vnode_label = mac_biba_copy_label, 3285 .mpo_externalize_cred_label = mac_biba_externalize_label, 3286 .mpo_externalize_ifnet_label = mac_biba_externalize_label, 3287 .mpo_externalize_pipe_label = mac_biba_externalize_label, 3288 .mpo_externalize_socket_label = mac_biba_externalize_label, 3289 .mpo_externalize_socket_peer_label = mac_biba_externalize_label, 3290 .mpo_externalize_vnode_label = mac_biba_externalize_label, 3291 .mpo_internalize_cred_label = mac_biba_internalize_label, 3292 .mpo_internalize_ifnet_label = mac_biba_internalize_label, 3293 .mpo_internalize_pipe_label = mac_biba_internalize_label, 3294 .mpo_internalize_socket_label = mac_biba_internalize_label, 3295 .mpo_internalize_vnode_label = mac_biba_internalize_label, 3296 .mpo_create_devfs_device = mac_biba_create_devfs_device, 3297 .mpo_create_devfs_directory = mac_biba_create_devfs_directory, 3298 .mpo_create_devfs_symlink = mac_biba_create_devfs_symlink, 3299 .mpo_create_mount = mac_biba_create_mount, 3300 .mpo_relabel_vnode = mac_biba_relabel_vnode, 3301 .mpo_update_devfsdirent = mac_biba_update_devfsdirent, 3302 .mpo_associate_vnode_devfs = mac_biba_associate_vnode_devfs, 3303 .mpo_associate_vnode_extattr = mac_biba_associate_vnode_extattr, 3304 .mpo_associate_vnode_singlelabel = mac_biba_associate_vnode_singlelabel, 3305 .mpo_create_vnode_extattr = mac_biba_create_vnode_extattr, 3306 .mpo_setlabel_vnode_extattr = mac_biba_setlabel_vnode_extattr, 3307 .mpo_create_mbuf_from_socket = mac_biba_create_mbuf_from_socket, 3308 .mpo_create_mbuf_from_syncache = mac_biba_create_mbuf_from_syncache, 3309 .mpo_create_pipe = mac_biba_create_pipe, 3310 .mpo_create_posix_sem = mac_biba_create_posix_sem, 3311 .mpo_create_socket = mac_biba_create_socket, 3312 .mpo_create_socket_from_socket = mac_biba_create_socket_from_socket, 3313 .mpo_relabel_pipe = mac_biba_relabel_pipe, 3314 .mpo_relabel_socket = mac_biba_relabel_socket, 3315 .mpo_set_socket_peer_from_mbuf = mac_biba_set_socket_peer_from_mbuf, 3316 .mpo_set_socket_peer_from_socket = mac_biba_set_socket_peer_from_socket, 3317 .mpo_create_bpfdesc = mac_biba_create_bpfdesc, 3318 .mpo_create_datagram_from_ipq = mac_biba_create_datagram_from_ipq, 3319 .mpo_create_fragment = mac_biba_create_fragment, 3320 .mpo_create_ifnet = mac_biba_create_ifnet, 3321 .mpo_create_inpcb_from_socket = mac_biba_create_inpcb_from_socket, 3322 .mpo_create_sysv_msgmsg = mac_biba_create_sysv_msgmsg, 3323 .mpo_create_sysv_msgqueue = mac_biba_create_sysv_msgqueue, 3324 .mpo_create_sysv_sem = mac_biba_create_sysv_sem, 3325 .mpo_create_sysv_shm = mac_biba_create_sysv_shm, 3326 .mpo_create_ipq = mac_biba_create_ipq, 3327 .mpo_create_mbuf_from_inpcb = mac_biba_create_mbuf_from_inpcb, 3328 .mpo_create_mbuf_linklayer = mac_biba_create_mbuf_linklayer, 3329 .mpo_create_mbuf_from_bpfdesc = mac_biba_create_mbuf_from_bpfdesc, 3330 .mpo_create_mbuf_from_ifnet = mac_biba_create_mbuf_from_ifnet, 3331 .mpo_create_mbuf_multicast_encap = mac_biba_create_mbuf_multicast_encap, 3332 .mpo_create_mbuf_netlayer = mac_biba_create_mbuf_netlayer, 3333 .mpo_fragment_match = mac_biba_fragment_match, 3334 .mpo_relabel_ifnet = mac_biba_relabel_ifnet, 3335 .mpo_update_ipq = mac_biba_update_ipq, 3336 .mpo_inpcb_sosetlabel = mac_biba_inpcb_sosetlabel, 3337 .mpo_create_proc0 = mac_biba_create_proc0, 3338 .mpo_create_proc1 = mac_biba_create_proc1, 3339 .mpo_relabel_cred = mac_biba_relabel_cred, 3340 .mpo_cleanup_sysv_msgmsg = mac_biba_cleanup_sysv_msgmsg, 3341 .mpo_cleanup_sysv_msgqueue = mac_biba_cleanup_sysv_msgqueue, 3342 .mpo_cleanup_sysv_sem = mac_biba_cleanup_sysv_sem, 3343 .mpo_cleanup_sysv_shm = mac_biba_cleanup_sysv_shm, 3344 .mpo_check_bpfdesc_receive = mac_biba_check_bpfdesc_receive, 3345 .mpo_check_cred_relabel = mac_biba_check_cred_relabel, 3346 .mpo_check_cred_visible = mac_biba_check_cred_visible, 3347 .mpo_check_ifnet_relabel = mac_biba_check_ifnet_relabel, 3348 .mpo_check_ifnet_transmit = mac_biba_check_ifnet_transmit, 3349 .mpo_check_inpcb_deliver = mac_biba_check_inpcb_deliver, 3350 .mpo_check_sysv_msgrcv = mac_biba_check_sysv_msgrcv, 3351 .mpo_check_sysv_msgrmid = mac_biba_check_sysv_msgrmid, 3352 .mpo_check_sysv_msqget = mac_biba_check_sysv_msqget, 3353 .mpo_check_sysv_msqsnd = mac_biba_check_sysv_msqsnd, 3354 .mpo_check_sysv_msqrcv = mac_biba_check_sysv_msqrcv, 3355 .mpo_check_sysv_msqctl = mac_biba_check_sysv_msqctl, 3356 .mpo_check_sysv_semctl = mac_biba_check_sysv_semctl, 3357 .mpo_check_sysv_semget = mac_biba_check_sysv_semget, 3358 .mpo_check_sysv_semop = mac_biba_check_sysv_semop, 3359 .mpo_check_sysv_shmat = mac_biba_check_sysv_shmat, 3360 .mpo_check_sysv_shmctl = mac_biba_check_sysv_shmctl, 3361 .mpo_check_sysv_shmget = mac_biba_check_sysv_shmget, 3362 .mpo_check_kld_load = mac_biba_check_kld_load, 3363 .mpo_check_mount_stat = mac_biba_check_mount_stat, 3364 .mpo_check_pipe_ioctl = mac_biba_check_pipe_ioctl, 3365 .mpo_check_pipe_poll = mac_biba_check_pipe_poll, 3366 .mpo_check_pipe_read = mac_biba_check_pipe_read, 3367 .mpo_check_pipe_relabel = mac_biba_check_pipe_relabel, 3368 .mpo_check_pipe_stat = mac_biba_check_pipe_stat, 3369 .mpo_check_pipe_write = mac_biba_check_pipe_write, 3370 .mpo_check_posix_sem_destroy = mac_biba_check_posix_sem_write, 3371 .mpo_check_posix_sem_getvalue = mac_biba_check_posix_sem_rdonly, 3372 .mpo_check_posix_sem_open = mac_biba_check_posix_sem_write, 3373 .mpo_check_posix_sem_post = mac_biba_check_posix_sem_write, 3374 .mpo_check_posix_sem_unlink = mac_biba_check_posix_sem_write, 3375 .mpo_check_posix_sem_wait = mac_biba_check_posix_sem_write, 3376 .mpo_check_proc_debug = mac_biba_check_proc_debug, 3377 .mpo_check_proc_sched = mac_biba_check_proc_sched, 3378 .mpo_check_proc_signal = mac_biba_check_proc_signal, 3379 .mpo_check_socket_deliver = mac_biba_check_socket_deliver, 3380 .mpo_check_socket_relabel = mac_biba_check_socket_relabel, 3381 .mpo_check_socket_visible = mac_biba_check_socket_visible, 3382 .mpo_check_system_acct = mac_biba_check_system_acct, 3383 .mpo_check_system_auditctl = mac_biba_check_system_auditctl, 3384 .mpo_check_system_auditon = mac_biba_check_system_auditon, 3385 .mpo_check_system_swapon = mac_biba_check_system_swapon, 3386 .mpo_check_system_swapoff = mac_biba_check_system_swapoff, 3387 .mpo_check_system_sysctl = mac_biba_check_system_sysctl, 3388 .mpo_check_vnode_access = mac_biba_check_vnode_open, 3389 .mpo_check_vnode_chdir = mac_biba_check_vnode_chdir, 3390 .mpo_check_vnode_chroot = mac_biba_check_vnode_chroot, 3391 .mpo_check_vnode_create = mac_biba_check_vnode_create, 3392 .mpo_check_vnode_delete = mac_biba_check_vnode_delete, 3393 .mpo_check_vnode_deleteacl = mac_biba_check_vnode_deleteacl, 3394 .mpo_check_vnode_deleteextattr = mac_biba_check_vnode_deleteextattr, 3395 .mpo_check_vnode_exec = mac_biba_check_vnode_exec, 3396 .mpo_check_vnode_getacl = mac_biba_check_vnode_getacl, 3397 .mpo_check_vnode_getextattr = mac_biba_check_vnode_getextattr, 3398 .mpo_check_vnode_link = mac_biba_check_vnode_link, 3399 .mpo_check_vnode_listextattr = mac_biba_check_vnode_listextattr, 3400 .mpo_check_vnode_lookup = mac_biba_check_vnode_lookup, 3401 .mpo_check_vnode_mmap = mac_biba_check_vnode_mmap, 3402 .mpo_check_vnode_open = mac_biba_check_vnode_open, 3403 .mpo_check_vnode_poll = mac_biba_check_vnode_poll, 3404 .mpo_check_vnode_read = mac_biba_check_vnode_read, 3405 .mpo_check_vnode_readdir = mac_biba_check_vnode_readdir, 3406 .mpo_check_vnode_readlink = mac_biba_check_vnode_readlink, 3407 .mpo_check_vnode_relabel = mac_biba_check_vnode_relabel, 3408 .mpo_check_vnode_rename_from = mac_biba_check_vnode_rename_from, 3409 .mpo_check_vnode_rename_to = mac_biba_check_vnode_rename_to, 3410 .mpo_check_vnode_revoke = mac_biba_check_vnode_revoke, 3411 .mpo_check_vnode_setacl = mac_biba_check_vnode_setacl, 3412 .mpo_check_vnode_setextattr = mac_biba_check_vnode_setextattr, 3413 .mpo_check_vnode_setflags = mac_biba_check_vnode_setflags, 3414 .mpo_check_vnode_setmode = mac_biba_check_vnode_setmode, 3415 .mpo_check_vnode_setowner = mac_biba_check_vnode_setowner, 3416 .mpo_check_vnode_setutimes = mac_biba_check_vnode_setutimes, 3417 .mpo_check_vnode_stat = mac_biba_check_vnode_stat, 3418 .mpo_check_vnode_write = mac_biba_check_vnode_write, 3419 .mpo_associate_nfsd_label = mac_biba_associate_nfsd_label, 3420 .mpo_create_mbuf_from_firewall = mac_biba_create_mbuf_from_firewall, 3421 .mpo_priv_check = mac_biba_priv_check, 3422}; 3423 3424MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 3425 MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &mac_biba_slot); 3426