mac_biba.c revision 110351
1/*- 2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson 3 * Copyright (c) 2001, 2002 Networks Associates Technology, 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 Network 9 * Associates Laboratories, the Security Research Division of Network 10 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 11 * as part of the DARPA 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 110351 2003-02-04 21:28:46Z rwatson $ 35 */ 36 37/* 38 * Developed by the TrustedBSD Project. 39 * Biba fixed label mandatory integrity policy. 40 */ 41 42#include <sys/types.h> 43#include <sys/param.h> 44#include <sys/acl.h> 45#include <sys/conf.h> 46#include <sys/extattr.h> 47#include <sys/kernel.h> 48#include <sys/mac.h> 49#include <sys/malloc.h> 50#include <sys/mount.h> 51#include <sys/proc.h> 52#include <sys/systm.h> 53#include <sys/sysproto.h> 54#include <sys/sysent.h> 55#include <sys/systm.h> 56#include <sys/vnode.h> 57#include <sys/file.h> 58#include <sys/socket.h> 59#include <sys/socketvar.h> 60#include <sys/pipe.h> 61#include <sys/sysctl.h> 62 63#include <fs/devfs/devfs.h> 64 65#include <net/bpfdesc.h> 66#include <net/if.h> 67#include <net/if_types.h> 68#include <net/if_var.h> 69 70#include <netinet/in.h> 71#include <netinet/ip_var.h> 72 73#include <vm/vm.h> 74 75#include <sys/mac_policy.h> 76 77#include <security/mac_biba/mac_biba.h> 78 79SYSCTL_DECL(_security_mac); 80 81SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0, 82 "TrustedBSD mac_biba policy controls"); 83 84static int mac_biba_label_size = sizeof(struct mac_biba); 85SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD, 86 &mac_biba_label_size, 0, "Size of struct mac_biba"); 87 88static int mac_biba_enabled = 1; 89SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, 90 &mac_biba_enabled, 0, "Enforce MAC/Biba policy"); 91TUNABLE_INT("security.mac.biba.enabled", &mac_biba_enabled); 92 93static int destroyed_not_inited; 94SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 95 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 96 97static int trust_all_interfaces = 0; 98SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, 99 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); 100TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces); 101 102static char trusted_interfaces[128]; 103SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD, 104 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); 105TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces, 106 sizeof(trusted_interfaces)); 107 108static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS; 109SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD, 110 &max_compartments, 0, "Maximum supported compartments"); 111 112static int ptys_equal = 0; 113SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, 114 &ptys_equal, 0, "Label pty devices as biba/equal on create"); 115TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal); 116 117static int revocation_enabled = 0; 118SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW, 119 &revocation_enabled, 0, "Revoke access to objects on relabel"); 120TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled); 121 122static int mac_biba_slot; 123#define SLOT(l) ((struct mac_biba *)LABEL_TO_SLOT((l), mac_biba_slot).l_ptr) 124 125MALLOC_DEFINE(M_MACBIBA, "biba label", "MAC/Biba labels"); 126 127static __inline int 128biba_bit_set_empty(u_char *set) { 129 int i; 130 131 for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++) 132 if (set[i] != 0) 133 return (0); 134 return (1); 135} 136 137static struct mac_biba * 138biba_alloc(int flag) 139{ 140 struct mac_biba *mac_biba; 141 142 mac_biba = malloc(sizeof(struct mac_biba), M_MACBIBA, M_ZERO | flag); 143 144 return (mac_biba); 145} 146 147static void 148biba_free(struct mac_biba *mac_biba) 149{ 150 151 if (mac_biba != NULL) 152 free(mac_biba, M_MACBIBA); 153 else 154 atomic_add_int(&destroyed_not_inited, 1); 155} 156 157static int 158biba_atmostflags(struct mac_biba *mac_biba, int flags) 159{ 160 161 if ((mac_biba->mb_flags & flags) != mac_biba->mb_flags) 162 return (EINVAL); 163 return (0); 164} 165 166static int 167mac_biba_dominate_element(struct mac_biba_element *a, 168 struct mac_biba_element *b) 169{ 170 int bit; 171 172 switch (a->mbe_type) { 173 case MAC_BIBA_TYPE_EQUAL: 174 case MAC_BIBA_TYPE_HIGH: 175 return (1); 176 177 case MAC_BIBA_TYPE_LOW: 178 switch (b->mbe_type) { 179 case MAC_BIBA_TYPE_GRADE: 180 case MAC_BIBA_TYPE_HIGH: 181 return (0); 182 183 case MAC_BIBA_TYPE_EQUAL: 184 case MAC_BIBA_TYPE_LOW: 185 return (1); 186 187 default: 188 panic("mac_biba_dominate_element: b->mbe_type invalid"); 189 } 190 191 case MAC_BIBA_TYPE_GRADE: 192 switch (b->mbe_type) { 193 case MAC_BIBA_TYPE_EQUAL: 194 case MAC_BIBA_TYPE_LOW: 195 return (1); 196 197 case MAC_BIBA_TYPE_HIGH: 198 return (0); 199 200 case MAC_BIBA_TYPE_GRADE: 201 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) 202 if (!MAC_BIBA_BIT_TEST(bit, 203 a->mbe_compartments) && 204 MAC_BIBA_BIT_TEST(bit, b->mbe_compartments)) 205 return (0); 206 return (a->mbe_grade >= b->mbe_grade); 207 208 default: 209 panic("mac_biba_dominate_element: b->mbe_type invalid"); 210 } 211 212 default: 213 panic("mac_biba_dominate_element: a->mbe_type invalid"); 214 } 215 216 return (0); 217} 218 219static int 220mac_biba_subject_dominate_high(struct mac_biba *mac_biba) 221{ 222 struct mac_biba_element *element; 223 224 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 225 ("mac_biba_single_in_range: mac_biba not single")); 226 element = &mac_biba->mb_single; 227 228 return (element->mbe_type == MAC_BIBA_TYPE_EQUAL || 229 element->mbe_type == MAC_BIBA_TYPE_HIGH); 230} 231 232static int 233mac_biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb) 234{ 235 236 return (mac_biba_dominate_element(&rangeb->mb_rangehigh, 237 &rangea->mb_rangehigh) && 238 mac_biba_dominate_element(&rangea->mb_rangelow, 239 &rangeb->mb_rangelow)); 240} 241 242static int 243mac_biba_single_in_range(struct mac_biba *single, struct mac_biba *range) 244{ 245 246 KASSERT((single->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 247 ("mac_biba_single_in_range: a not single")); 248 KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 249 ("mac_biba_single_in_range: b not range")); 250 251 return (mac_biba_dominate_element(&range->mb_rangehigh, 252 &single->mb_single) && 253 mac_biba_dominate_element(&single->mb_single, 254 &range->mb_rangelow)); 255 256 return (1); 257} 258 259static int 260mac_biba_dominate_single(struct mac_biba *a, struct mac_biba *b) 261{ 262 KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 263 ("mac_biba_dominate_single: a not single")); 264 KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 265 ("mac_biba_dominate_single: b not single")); 266 267 return (mac_biba_dominate_element(&a->mb_single, &b->mb_single)); 268} 269 270static int 271mac_biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b) 272{ 273 274 if (a->mbe_type == MAC_BIBA_TYPE_EQUAL || 275 b->mbe_type == MAC_BIBA_TYPE_EQUAL) 276 return (1); 277 278 return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade); 279} 280 281static int 282mac_biba_equal_single(struct mac_biba *a, struct mac_biba *b) 283{ 284 285 KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 286 ("mac_biba_equal_single: a not single")); 287 KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 288 ("mac_biba_equal_single: b not single")); 289 290 return (mac_biba_equal_element(&a->mb_single, &b->mb_single)); 291} 292 293static int 294mac_biba_contains_equal(struct mac_biba *mac_biba) 295{ 296 297 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) 298 if (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_EQUAL) 299 return (1); 300 301 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 302 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL) 303 return (1); 304 if (mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 305 return (1); 306 } 307 308 return (0); 309} 310 311static int 312mac_biba_subject_privileged(struct mac_biba *mac_biba) 313{ 314 315 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAGS_BOTH) == 316 MAC_BIBA_FLAGS_BOTH, 317 ("mac_biba_subject_privileged: subject doesn't have both labels")); 318 319 /* If the single is EQUAL, it's ok. */ 320 if (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_EQUAL) 321 return (0); 322 323 /* If either range endpoint is EQUAL, it's ok. */ 324 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL || 325 mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 326 return (0); 327 328 /* If the range is low-high, it's ok. */ 329 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW && 330 mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH) 331 return (0); 332 333 /* It's not ok. */ 334 return (EPERM); 335} 336 337static int 338mac_biba_high_single(struct mac_biba *mac_biba) 339{ 340 341 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 342 ("mac_biba_equal_single: mac_biba not single")); 343 344 return (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_HIGH); 345} 346 347static int 348mac_biba_valid(struct mac_biba *mac_biba) 349{ 350 351 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { 352 switch (mac_biba->mb_single.mbe_type) { 353 case MAC_BIBA_TYPE_GRADE: 354 break; 355 356 case MAC_BIBA_TYPE_EQUAL: 357 case MAC_BIBA_TYPE_HIGH: 358 case MAC_BIBA_TYPE_LOW: 359 if (mac_biba->mb_single.mbe_grade != 0 || 360 !MAC_BIBA_BIT_SET_EMPTY( 361 mac_biba->mb_single.mbe_compartments)) 362 return (EINVAL); 363 break; 364 365 default: 366 return (EINVAL); 367 } 368 } else { 369 if (mac_biba->mb_single.mbe_type != MAC_BIBA_TYPE_UNDEF) 370 return (EINVAL); 371 } 372 373 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 374 switch (mac_biba->mb_rangelow.mbe_type) { 375 case MAC_BIBA_TYPE_GRADE: 376 break; 377 378 case MAC_BIBA_TYPE_EQUAL: 379 case MAC_BIBA_TYPE_HIGH: 380 case MAC_BIBA_TYPE_LOW: 381 if (mac_biba->mb_rangelow.mbe_grade != 0 || 382 !MAC_BIBA_BIT_SET_EMPTY( 383 mac_biba->mb_rangelow.mbe_compartments)) 384 return (EINVAL); 385 break; 386 387 default: 388 return (EINVAL); 389 } 390 391 switch (mac_biba->mb_rangehigh.mbe_type) { 392 case MAC_BIBA_TYPE_GRADE: 393 break; 394 395 case MAC_BIBA_TYPE_EQUAL: 396 case MAC_BIBA_TYPE_HIGH: 397 case MAC_BIBA_TYPE_LOW: 398 if (mac_biba->mb_rangehigh.mbe_grade != 0 || 399 !MAC_BIBA_BIT_SET_EMPTY( 400 mac_biba->mb_rangehigh.mbe_compartments)) 401 return (EINVAL); 402 break; 403 404 default: 405 return (EINVAL); 406 } 407 if (!mac_biba_dominate_element(&mac_biba->mb_rangehigh, 408 &mac_biba->mb_rangelow)) 409 return (EINVAL); 410 } else { 411 if (mac_biba->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF || 412 mac_biba->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF) 413 return (EINVAL); 414 } 415 416 return (0); 417} 418 419static void 420mac_biba_set_range(struct mac_biba *mac_biba, u_short typelow, 421 u_short gradelow, u_char *compartmentslow, u_short typehigh, 422 u_short gradehigh, u_char *compartmentshigh) 423{ 424 425 mac_biba->mb_rangelow.mbe_type = typelow; 426 mac_biba->mb_rangelow.mbe_grade = gradelow; 427 if (compartmentslow != NULL) 428 memcpy(mac_biba->mb_rangelow.mbe_compartments, 429 compartmentslow, 430 sizeof(mac_biba->mb_rangelow.mbe_compartments)); 431 mac_biba->mb_rangehigh.mbe_type = typehigh; 432 mac_biba->mb_rangehigh.mbe_grade = gradehigh; 433 if (compartmentshigh != NULL) 434 memcpy(mac_biba->mb_rangehigh.mbe_compartments, 435 compartmentshigh, 436 sizeof(mac_biba->mb_rangehigh.mbe_compartments)); 437 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 438} 439 440static void 441mac_biba_set_single(struct mac_biba *mac_biba, u_short type, u_short grade, 442 u_char *compartments) 443{ 444 445 mac_biba->mb_single.mbe_type = type; 446 mac_biba->mb_single.mbe_grade = grade; 447 if (compartments != NULL) 448 memcpy(mac_biba->mb_single.mbe_compartments, compartments, 449 sizeof(mac_biba->mb_single.mbe_compartments)); 450 mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; 451} 452 453static void 454mac_biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto) 455{ 456 457 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 458 ("mac_biba_copy_range: labelfrom not range")); 459 460 labelto->mb_rangelow = labelfrom->mb_rangelow; 461 labelto->mb_rangehigh = labelfrom->mb_rangehigh; 462 labelto->mb_flags |= MAC_BIBA_FLAG_RANGE; 463} 464 465static void 466mac_biba_copy_single(struct mac_biba *labelfrom, struct mac_biba *labelto) 467{ 468 469 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 470 ("mac_biba_copy_single: labelfrom not single")); 471 472 labelto->mb_single = labelfrom->mb_single; 473 labelto->mb_flags |= MAC_BIBA_FLAG_SINGLE; 474} 475 476static void 477mac_biba_copy(struct mac_biba *source, struct mac_biba *dest) 478{ 479 480 if (source->mb_flags & MAC_BIBA_FLAG_SINGLE) 481 mac_biba_copy_single(source, dest); 482 if (source->mb_flags & MAC_BIBA_FLAG_RANGE) 483 mac_biba_copy_range(source, dest); 484} 485 486/* 487 * Policy module operations. 488 */ 489static void 490mac_biba_destroy(struct mac_policy_conf *conf) 491{ 492 493} 494 495static void 496mac_biba_init(struct mac_policy_conf *conf) 497{ 498 499} 500 501/* 502 * Label operations. 503 */ 504static void 505mac_biba_init_label(struct label *label) 506{ 507 508 SLOT(label) = biba_alloc(0); 509} 510 511static int 512mac_biba_init_label_waitcheck(struct label *label, int flag) 513{ 514 515 SLOT(label) = biba_alloc(flag); 516 if (SLOT(label) == NULL) 517 return (ENOMEM); 518 519 return (0); 520} 521 522static void 523mac_biba_destroy_label(struct label *label) 524{ 525 526 biba_free(SLOT(label)); 527 SLOT(label) = NULL; 528} 529 530/* 531 * mac_biba_element_to_string() is basically an snprintf wrapper with 532 * the same properties as snprintf(). It returns the length it would 533 * have added to the string in the event the string is too short. 534 */ 535static size_t 536mac_biba_element_to_string(char *string, size_t size, 537 struct mac_biba_element *element) 538{ 539 int pos, bit = 1; 540 541 switch (element->mbe_type) { 542 case MAC_BIBA_TYPE_HIGH: 543 return (snprintf(string, size, "high")); 544 545 case MAC_BIBA_TYPE_LOW: 546 return (snprintf(string, size, "low")); 547 548 case MAC_BIBA_TYPE_EQUAL: 549 return (snprintf(string, size, "equal")); 550 551 case MAC_BIBA_TYPE_GRADE: 552 pos = snprintf(string, size, "%d:", element->mbe_grade); 553 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) { 554 if (MAC_BIBA_BIT_TEST(bit, element->mbe_compartments)) 555 pos += snprintf(string + pos, size - pos, 556 "%d+", bit); 557 } 558 if (string[pos - 1] == '+' || string[pos - 1] == ':') 559 string[--pos] = '\0'; 560 return (pos); 561 562 default: 563 panic("mac_biba_element_to_string: invalid type (%d)", 564 element->mbe_type); 565 } 566} 567 568static int 569mac_biba_to_string(char *string, size_t size, size_t *caller_len, 570 struct mac_biba *mac_biba) 571{ 572 size_t left, len; 573 char *curptr; 574 575 bzero(string, size); 576 curptr = string; 577 left = size; 578 579 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { 580 len = mac_biba_element_to_string(curptr, left, 581 &mac_biba->mb_single); 582 if (len >= left) 583 return (EINVAL); 584 left -= len; 585 curptr += len; 586 } 587 588 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 589 len = snprintf(curptr, left, "("); 590 if (len >= left) 591 return (EINVAL); 592 left -= len; 593 curptr += len; 594 595 len = mac_biba_element_to_string(curptr, left, 596 &mac_biba->mb_rangelow); 597 if (len >= left) 598 return (EINVAL); 599 left -= len; 600 curptr += len; 601 602 len = snprintf(curptr, left, "-"); 603 if (len >= left) 604 return (EINVAL); 605 left -= len; 606 curptr += len; 607 608 len = mac_biba_element_to_string(curptr, left, 609 &mac_biba->mb_rangehigh); 610 if (len >= left) 611 return (EINVAL); 612 left -= len; 613 curptr += len; 614 615 len = snprintf(curptr, left, ")"); 616 if (len >= left) 617 return (EINVAL); 618 left -= len; 619 curptr += len; 620 } 621 622 *caller_len = strlen(string); 623 return (0); 624} 625 626static int 627mac_biba_externalize_label(struct label *label, char *element_name, 628 char *element_data, size_t size, size_t *len, int *claimed) 629{ 630 struct mac_biba *mac_biba; 631 int error; 632 633 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 634 return (0); 635 636 (*claimed)++; 637 638 mac_biba = SLOT(label); 639 error = mac_biba_to_string(element_data, size, len, mac_biba); 640 if (error) 641 return (error); 642 643 *len = strlen(element_data); 644 return (0); 645} 646 647static int 648mac_biba_parse_element(struct mac_biba_element *element, char *string) 649{ 650 651 if (strcmp(string, "high") == 0 || 652 strcmp(string, "hi") == 0) { 653 element->mbe_type = MAC_BIBA_TYPE_HIGH; 654 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 655 } else if (strcmp(string, "low") == 0 || 656 strcmp(string, "lo") == 0) { 657 element->mbe_type = MAC_BIBA_TYPE_LOW; 658 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 659 } else if (strcmp(string, "equal") == 0 || 660 strcmp(string, "eq") == 0) { 661 element->mbe_type = MAC_BIBA_TYPE_EQUAL; 662 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 663 } else { 664 char *p0, *p1; 665 int d; 666 667 p0 = string; 668 d = strtol(p0, &p1, 10); 669 670 if (d < 0 || d > 65535) 671 return (EINVAL); 672 element->mbe_type = MAC_BIBA_TYPE_GRADE; 673 element->mbe_grade = d; 674 675 if (*p1 != ':') { 676 if (p1 == p0 || *p1 != '\0') 677 return (EINVAL); 678 else 679 return (0); 680 } 681 else 682 if (*(p1 + 1) == '\0') 683 return (0); 684 685 while ((p0 = ++p1)) { 686 d = strtol(p0, &p1, 10); 687 if (d < 1 || d > MAC_BIBA_MAX_COMPARTMENTS) 688 return (EINVAL); 689 690 MAC_BIBA_BIT_SET(d, element->mbe_compartments); 691 692 if (*p1 == '\0') 693 break; 694 if (p1 == p0 || *p1 != '+') 695 return (EINVAL); 696 } 697 } 698 699 return (0); 700} 701 702/* 703 * Note: destructively consumes the string, make a local copy before 704 * calling if that's a problem. 705 */ 706static int 707mac_biba_parse(struct mac_biba *mac_biba, char *string) 708{ 709 char *range, *rangeend, *rangehigh, *rangelow, *single; 710 int error; 711 712 /* Do we have a range? */ 713 single = string; 714 range = index(string, '('); 715 if (range == single) 716 single = NULL; 717 rangelow = rangehigh = NULL; 718 if (range != NULL) { 719 /* Nul terminate the end of the single string. */ 720 *range = '\0'; 721 range++; 722 rangelow = range; 723 rangehigh = index(rangelow, '-'); 724 if (rangehigh == NULL) 725 return (EINVAL); 726 rangehigh++; 727 if (*rangelow == '\0' || *rangehigh == '\0') 728 return (EINVAL); 729 rangeend = index(rangehigh, ')'); 730 if (rangeend == NULL) 731 return (EINVAL); 732 if (*(rangeend + 1) != '\0') 733 return (EINVAL); 734 /* Nul terminate the ends of the ranges. */ 735 *(rangehigh - 1) = '\0'; 736 *rangeend = '\0'; 737 } 738 KASSERT((rangelow != NULL && rangehigh != NULL) || 739 (rangelow == NULL && rangehigh == NULL), 740 ("mac_biba_internalize_label: range mismatch")); 741 742 bzero(mac_biba, sizeof(*mac_biba)); 743 if (single != NULL) { 744 error = mac_biba_parse_element(&mac_biba->mb_single, single); 745 if (error) 746 return (error); 747 mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; 748 } 749 750 if (rangelow != NULL) { 751 error = mac_biba_parse_element(&mac_biba->mb_rangelow, 752 rangelow); 753 if (error) 754 return (error); 755 error = mac_biba_parse_element(&mac_biba->mb_rangehigh, 756 rangehigh); 757 if (error) 758 return (error); 759 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 760 } 761 762 error = mac_biba_valid(mac_biba); 763 if (error) 764 return (error); 765 766 return (0); 767} 768 769static int 770mac_biba_internalize_label(struct label *label, char *element_name, 771 char *element_data, int *claimed) 772{ 773 struct mac_biba *mac_biba, mac_biba_temp; 774 int error; 775 776 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 777 return (0); 778 779 (*claimed)++; 780 781 error = mac_biba_parse(&mac_biba_temp, element_data); 782 if (error) 783 return (error); 784 785 mac_biba = SLOT(label); 786 *mac_biba = mac_biba_temp; 787 788 return (0); 789} 790 791static void 792mac_biba_copy_label(struct label *src, struct label *dest) 793{ 794 795 *SLOT(dest) = *SLOT(src); 796} 797 798/* 799 * Labeling event operations: file system objects, and things that look 800 * a lot like file system objects. 801 */ 802static void 803mac_biba_create_devfs_device(struct mount *mp, dev_t dev, 804 struct devfs_dirent *devfs_dirent, struct label *label) 805{ 806 struct mac_biba *mac_biba; 807 int biba_type; 808 809 mac_biba = SLOT(label); 810 if (strcmp(dev->si_name, "null") == 0 || 811 strcmp(dev->si_name, "zero") == 0 || 812 strcmp(dev->si_name, "random") == 0 || 813 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 814 biba_type = MAC_BIBA_TYPE_EQUAL; 815 else if (ptys_equal && 816 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 817 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 818 biba_type = MAC_BIBA_TYPE_EQUAL; 819 else 820 biba_type = MAC_BIBA_TYPE_HIGH; 821 mac_biba_set_single(mac_biba, biba_type, 0, NULL); 822} 823 824static void 825mac_biba_create_devfs_directory(struct mount *mp, char *dirname, 826 int dirnamelen, struct devfs_dirent *devfs_dirent, struct label *label) 827{ 828 struct mac_biba *mac_biba; 829 830 mac_biba = SLOT(label); 831 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 832} 833 834static void 835mac_biba_create_devfs_symlink(struct ucred *cred, struct mount *mp, 836 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 837 struct label *delabel) 838{ 839 struct mac_biba *source, *dest; 840 841 source = SLOT(&cred->cr_label); 842 dest = SLOT(delabel); 843 844 mac_biba_copy_single(source, dest); 845} 846 847static void 848mac_biba_create_mount(struct ucred *cred, struct mount *mp, 849 struct label *mntlabel, struct label *fslabel) 850{ 851 struct mac_biba *source, *dest; 852 853 source = SLOT(&cred->cr_label); 854 dest = SLOT(mntlabel); 855 mac_biba_copy_single(source, dest); 856 dest = SLOT(fslabel); 857 mac_biba_copy_single(source, dest); 858} 859 860static void 861mac_biba_create_root_mount(struct ucred *cred, struct mount *mp, 862 struct label *mntlabel, struct label *fslabel) 863{ 864 struct mac_biba *mac_biba; 865 866 /* Always mount root as high integrity. */ 867 mac_biba = SLOT(fslabel); 868 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 869 mac_biba = SLOT(mntlabel); 870 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 871} 872 873static void 874mac_biba_relabel_vnode(struct ucred *cred, struct vnode *vp, 875 struct label *vnodelabel, struct label *label) 876{ 877 struct mac_biba *source, *dest; 878 879 source = SLOT(label); 880 dest = SLOT(vnodelabel); 881 882 mac_biba_copy(source, dest); 883} 884 885static void 886mac_biba_update_devfsdirent(struct mount *mp, 887 struct devfs_dirent *devfs_dirent, struct label *direntlabel, 888 struct vnode *vp, struct label *vnodelabel) 889{ 890 struct mac_biba *source, *dest; 891 892 source = SLOT(vnodelabel); 893 dest = SLOT(direntlabel); 894 895 mac_biba_copy(source, dest); 896} 897 898static void 899mac_biba_associate_vnode_devfs(struct mount *mp, struct label *fslabel, 900 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 901 struct label *vlabel) 902{ 903 struct mac_biba *source, *dest; 904 905 source = SLOT(delabel); 906 dest = SLOT(vlabel); 907 908 mac_biba_copy_single(source, dest); 909} 910 911static int 912mac_biba_associate_vnode_extattr(struct mount *mp, struct label *fslabel, 913 struct vnode *vp, struct label *vlabel) 914{ 915 struct mac_biba temp, *source, *dest; 916 int buflen, error; 917 918 source = SLOT(fslabel); 919 dest = SLOT(vlabel); 920 921 buflen = sizeof(temp); 922 bzero(&temp, buflen); 923 924 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 925 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &temp, curthread); 926 if (error == ENOATTR || error == EOPNOTSUPP) { 927 /* Fall back to the fslabel. */ 928 mac_biba_copy_single(source, dest); 929 return (0); 930 } else if (error) 931 return (error); 932 933 if (buflen != sizeof(temp)) { 934 printf("mac_biba_associate_vnode_extattr: bad size %d\n", 935 buflen); 936 return (EPERM); 937 } 938 if (mac_biba_valid(&temp) != 0) { 939 printf("mac_biba_associate_vnode_extattr: invalid\n"); 940 return (EPERM); 941 } 942 if ((temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) { 943 printf("mac_biba_associate_vnode_extattr: not single\n"); 944 return (EPERM); 945 } 946 947 mac_biba_copy_single(&temp, dest); 948 return (0); 949} 950 951static void 952mac_biba_associate_vnode_singlelabel(struct mount *mp, 953 struct label *fslabel, struct vnode *vp, struct label *vlabel) 954{ 955 struct mac_biba *source, *dest; 956 957 source = SLOT(fslabel); 958 dest = SLOT(vlabel); 959 960 mac_biba_copy_single(source, dest); 961} 962 963static int 964mac_biba_create_vnode_extattr(struct ucred *cred, struct mount *mp, 965 struct label *fslabel, struct vnode *dvp, struct label *dlabel, 966 struct vnode *vp, struct label *vlabel, struct componentname *cnp) 967{ 968 struct mac_biba *source, *dest, temp; 969 size_t buflen; 970 int error; 971 972 buflen = sizeof(temp); 973 bzero(&temp, buflen); 974 975 source = SLOT(&cred->cr_label); 976 dest = SLOT(vlabel); 977 mac_biba_copy_single(source, &temp); 978 979 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 980 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 981 if (error == 0) 982 mac_biba_copy_single(source, dest); 983 return (error); 984} 985 986static int 987mac_biba_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 988 struct label *vlabel, struct label *intlabel) 989{ 990 struct mac_biba *source, temp; 991 size_t buflen; 992 int error; 993 994 buflen = sizeof(temp); 995 bzero(&temp, buflen); 996 997 source = SLOT(intlabel); 998 if ((source->mb_flags & MAC_BIBA_FLAG_SINGLE) == 0) 999 return (0); 1000 1001 mac_biba_copy_single(source, &temp); 1002 1003 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 1004 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 1005 return (error); 1006} 1007 1008/* 1009 * Labeling event operations: IPC object. 1010 */ 1011static void 1012mac_biba_create_mbuf_from_socket(struct socket *so, struct label *socketlabel, 1013 struct mbuf *m, struct label *mbuflabel) 1014{ 1015 struct mac_biba *source, *dest; 1016 1017 source = SLOT(socketlabel); 1018 dest = SLOT(mbuflabel); 1019 1020 mac_biba_copy_single(source, dest); 1021} 1022 1023static void 1024mac_biba_create_socket(struct ucred *cred, struct socket *socket, 1025 struct label *socketlabel) 1026{ 1027 struct mac_biba *source, *dest; 1028 1029 source = SLOT(&cred->cr_label); 1030 dest = SLOT(socketlabel); 1031 1032 mac_biba_copy_single(source, dest); 1033} 1034 1035static void 1036mac_biba_create_pipe(struct ucred *cred, struct pipe *pipe, 1037 struct label *pipelabel) 1038{ 1039 struct mac_biba *source, *dest; 1040 1041 source = SLOT(&cred->cr_label); 1042 dest = SLOT(pipelabel); 1043 1044 mac_biba_copy_single(source, dest); 1045} 1046 1047static void 1048mac_biba_create_socket_from_socket(struct socket *oldsocket, 1049 struct label *oldsocketlabel, struct socket *newsocket, 1050 struct label *newsocketlabel) 1051{ 1052 struct mac_biba *source, *dest; 1053 1054 source = SLOT(oldsocketlabel); 1055 dest = SLOT(newsocketlabel); 1056 1057 mac_biba_copy_single(source, dest); 1058} 1059 1060static void 1061mac_biba_relabel_socket(struct ucred *cred, struct socket *socket, 1062 struct label *socketlabel, struct label *newlabel) 1063{ 1064 struct mac_biba *source, *dest; 1065 1066 source = SLOT(newlabel); 1067 dest = SLOT(socketlabel); 1068 1069 mac_biba_copy(source, dest); 1070} 1071 1072static void 1073mac_biba_relabel_pipe(struct ucred *cred, struct pipe *pipe, 1074 struct label *pipelabel, struct label *newlabel) 1075{ 1076 struct mac_biba *source, *dest; 1077 1078 source = SLOT(newlabel); 1079 dest = SLOT(pipelabel); 1080 1081 mac_biba_copy(source, dest); 1082} 1083 1084static void 1085mac_biba_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel, 1086 struct socket *socket, struct label *socketpeerlabel) 1087{ 1088 struct mac_biba *source, *dest; 1089 1090 source = SLOT(mbuflabel); 1091 dest = SLOT(socketpeerlabel); 1092 1093 mac_biba_copy_single(source, dest); 1094} 1095 1096/* 1097 * Labeling event operations: network objects. 1098 */ 1099static void 1100mac_biba_set_socket_peer_from_socket(struct socket *oldsocket, 1101 struct label *oldsocketlabel, struct socket *newsocket, 1102 struct label *newsocketpeerlabel) 1103{ 1104 struct mac_biba *source, *dest; 1105 1106 source = SLOT(oldsocketlabel); 1107 dest = SLOT(newsocketpeerlabel); 1108 1109 mac_biba_copy_single(source, dest); 1110} 1111 1112static void 1113mac_biba_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d, 1114 struct label *bpflabel) 1115{ 1116 struct mac_biba *source, *dest; 1117 1118 source = SLOT(&cred->cr_label); 1119 dest = SLOT(bpflabel); 1120 1121 mac_biba_copy_single(source, dest); 1122} 1123 1124static void 1125mac_biba_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel) 1126{ 1127 char tifname[IFNAMSIZ], ifname[IFNAMSIZ], *p, *q; 1128 char tiflist[sizeof(trusted_interfaces)]; 1129 struct mac_biba *dest; 1130 int len, type; 1131 1132 dest = SLOT(ifnetlabel); 1133 1134 if (ifnet->if_type == IFT_LOOP) { 1135 type = MAC_BIBA_TYPE_EQUAL; 1136 goto set; 1137 } 1138 1139 if (trust_all_interfaces) { 1140 type = MAC_BIBA_TYPE_HIGH; 1141 goto set; 1142 } 1143 1144 type = MAC_BIBA_TYPE_LOW; 1145 1146 if (trusted_interfaces[0] == '\0' || 1147 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1148 goto set; 1149 1150 bzero(tiflist, sizeof(tiflist)); 1151 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1152 if(*p != ' ' && *p != '\t') 1153 *q = *p; 1154 1155 snprintf(ifname, IFNAMSIZ, "%s%d", ifnet->if_name, ifnet->if_unit); 1156 1157 for (p = q = tiflist;; p++) { 1158 if (*p == ',' || *p == '\0') { 1159 len = p - q; 1160 if (len < IFNAMSIZ) { 1161 bzero(tifname, sizeof(tifname)); 1162 bcopy(q, tifname, len); 1163 if (strcmp(tifname, ifname) == 0) { 1164 type = MAC_BIBA_TYPE_HIGH; 1165 break; 1166 } 1167 } else { 1168 *p = '\0'; 1169 printf("mac_biba warning: interface name " 1170 "\"%s\" is too long (must be < %d)\n", 1171 q, IFNAMSIZ); 1172 } 1173 if (*p == '\0') 1174 break; 1175 q = p + 1; 1176 } 1177 } 1178set: 1179 mac_biba_set_single(dest, type, 0, NULL); 1180 mac_biba_set_range(dest, type, 0, NULL, type, 0, NULL); 1181} 1182 1183static void 1184mac_biba_create_ipq(struct mbuf *fragment, struct label *fragmentlabel, 1185 struct ipq *ipq, struct label *ipqlabel) 1186{ 1187 struct mac_biba *source, *dest; 1188 1189 source = SLOT(fragmentlabel); 1190 dest = SLOT(ipqlabel); 1191 1192 mac_biba_copy_single(source, dest); 1193} 1194 1195static void 1196mac_biba_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel, 1197 struct mbuf *datagram, struct label *datagramlabel) 1198{ 1199 struct mac_biba *source, *dest; 1200 1201 source = SLOT(ipqlabel); 1202 dest = SLOT(datagramlabel); 1203 1204 /* Just use the head, since we require them all to match. */ 1205 mac_biba_copy_single(source, dest); 1206} 1207 1208static void 1209mac_biba_create_fragment(struct mbuf *datagram, struct label *datagramlabel, 1210 struct mbuf *fragment, struct label *fragmentlabel) 1211{ 1212 struct mac_biba *source, *dest; 1213 1214 source = SLOT(datagramlabel); 1215 dest = SLOT(fragmentlabel); 1216 1217 mac_biba_copy_single(source, dest); 1218} 1219 1220static void 1221mac_biba_create_mbuf_from_mbuf(struct mbuf *oldmbuf, 1222 struct label *oldmbuflabel, struct mbuf *newmbuf, 1223 struct label *newmbuflabel) 1224{ 1225 struct mac_biba *source, *dest; 1226 1227 source = SLOT(oldmbuflabel); 1228 dest = SLOT(newmbuflabel); 1229 1230 /* 1231 * Because the source mbuf may not yet have been "created", 1232 * just initialized, we do a conditional copy. Since we don't 1233 * allow mbufs to have ranges, do a KASSERT to make sure that 1234 * doesn't happen. 1235 */ 1236 KASSERT((source->mb_flags & MAC_BIBA_FLAG_RANGE) == 0, 1237 ("mac_biba_create_mbuf_from_mbuf: source mbuf has range")); 1238 mac_biba_copy(source, dest); 1239} 1240 1241static void 1242mac_biba_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel, 1243 struct mbuf *mbuf, struct label *mbuflabel) 1244{ 1245 struct mac_biba *dest; 1246 1247 dest = SLOT(mbuflabel); 1248 1249 mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1250} 1251 1252static void 1253mac_biba_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel, 1254 struct mbuf *mbuf, struct label *mbuflabel) 1255{ 1256 struct mac_biba *source, *dest; 1257 1258 source = SLOT(bpflabel); 1259 dest = SLOT(mbuflabel); 1260 1261 mac_biba_copy_single(source, dest); 1262} 1263 1264static void 1265mac_biba_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel, 1266 struct mbuf *m, struct label *mbuflabel) 1267{ 1268 struct mac_biba *source, *dest; 1269 1270 source = SLOT(ifnetlabel); 1271 dest = SLOT(mbuflabel); 1272 1273 mac_biba_copy_single(source, dest); 1274} 1275 1276static void 1277mac_biba_create_mbuf_multicast_encap(struct mbuf *oldmbuf, 1278 struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel, 1279 struct mbuf *newmbuf, struct label *newmbuflabel) 1280{ 1281 struct mac_biba *source, *dest; 1282 1283 source = SLOT(oldmbuflabel); 1284 dest = SLOT(newmbuflabel); 1285 1286 mac_biba_copy_single(source, dest); 1287} 1288 1289static void 1290mac_biba_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel, 1291 struct mbuf *newmbuf, struct label *newmbuflabel) 1292{ 1293 struct mac_biba *source, *dest; 1294 1295 source = SLOT(oldmbuflabel); 1296 dest = SLOT(newmbuflabel); 1297 1298 mac_biba_copy_single(source, dest); 1299} 1300 1301static int 1302mac_biba_fragment_match(struct mbuf *fragment, struct label *fragmentlabel, 1303 struct ipq *ipq, struct label *ipqlabel) 1304{ 1305 struct mac_biba *a, *b; 1306 1307 a = SLOT(ipqlabel); 1308 b = SLOT(fragmentlabel); 1309 1310 return (mac_biba_equal_single(a, b)); 1311} 1312 1313static void 1314mac_biba_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet, 1315 struct label *ifnetlabel, struct label *newlabel) 1316{ 1317 struct mac_biba *source, *dest; 1318 1319 source = SLOT(newlabel); 1320 dest = SLOT(ifnetlabel); 1321 1322 mac_biba_copy(source, dest); 1323} 1324 1325static void 1326mac_biba_update_ipq(struct mbuf *fragment, struct label *fragmentlabel, 1327 struct ipq *ipq, struct label *ipqlabel) 1328{ 1329 1330 /* NOOP: we only accept matching labels, so no need to update */ 1331} 1332 1333/* 1334 * Labeling event operations: processes. 1335 */ 1336static void 1337mac_biba_create_cred(struct ucred *cred_parent, struct ucred *cred_child) 1338{ 1339 struct mac_biba *source, *dest; 1340 1341 source = SLOT(&cred_parent->cr_label); 1342 dest = SLOT(&cred_child->cr_label); 1343 1344 mac_biba_copy_single(source, dest); 1345 mac_biba_copy_range(source, dest); 1346} 1347 1348static void 1349mac_biba_create_proc0(struct ucred *cred) 1350{ 1351 struct mac_biba *dest; 1352 1353 dest = SLOT(&cred->cr_label); 1354 1355 mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1356 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1357 MAC_BIBA_TYPE_HIGH, 0, NULL); 1358} 1359 1360static void 1361mac_biba_create_proc1(struct ucred *cred) 1362{ 1363 struct mac_biba *dest; 1364 1365 dest = SLOT(&cred->cr_label); 1366 1367 mac_biba_set_single(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1368 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1369 MAC_BIBA_TYPE_HIGH, 0, NULL); 1370} 1371 1372static void 1373mac_biba_relabel_cred(struct ucred *cred, struct label *newlabel) 1374{ 1375 struct mac_biba *source, *dest; 1376 1377 source = SLOT(newlabel); 1378 dest = SLOT(&cred->cr_label); 1379 1380 mac_biba_copy(source, dest); 1381} 1382 1383/* 1384 * Access control checks. 1385 */ 1386static int 1387mac_biba_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel, 1388 struct ifnet *ifnet, struct label *ifnetlabel) 1389{ 1390 struct mac_biba *a, *b; 1391 1392 if (!mac_biba_enabled) 1393 return (0); 1394 1395 a = SLOT(bpflabel); 1396 b = SLOT(ifnetlabel); 1397 1398 if (mac_biba_equal_single(a, b)) 1399 return (0); 1400 return (EACCES); 1401} 1402 1403static int 1404mac_biba_check_cred_relabel(struct ucred *cred, struct label *newlabel) 1405{ 1406 struct mac_biba *subj, *new; 1407 int error; 1408 1409 subj = SLOT(&cred->cr_label); 1410 new = SLOT(newlabel); 1411 1412 /* 1413 * If there is a Biba label update for the credential, it may 1414 * be an update of the single, range, or both. 1415 */ 1416 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1417 if (error) 1418 return (error); 1419 1420 /* 1421 * If the Biba label is to be changed, authorize as appropriate. 1422 */ 1423 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1424 /* 1425 * If the change request modifies both the Biba label 1426 * single and range, check that the new single will be 1427 * in the new range. 1428 */ 1429 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 1430 MAC_BIBA_FLAGS_BOTH && 1431 !mac_biba_single_in_range(new, new)) 1432 return (EINVAL); 1433 1434 /* 1435 * To change the Biba single label on a credential, the 1436 * new single label must be in the current range. 1437 */ 1438 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE && 1439 !mac_biba_single_in_range(new, subj)) 1440 return (EPERM); 1441 1442 /* 1443 * To change the Biba range on a credential, the new 1444 * range label must be in the current range. 1445 */ 1446 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1447 !mac_biba_range_in_range(new, subj)) 1448 return (EPERM); 1449 1450 /* 1451 * To have EQUAL in any component of the new credential 1452 * Biba label, the subject must already have EQUAL in 1453 * their label. 1454 */ 1455 if (mac_biba_contains_equal(new)) { 1456 error = mac_biba_subject_privileged(subj); 1457 if (error) 1458 return (error); 1459 } 1460 } 1461 1462 return (0); 1463} 1464 1465static int 1466mac_biba_check_cred_visible(struct ucred *u1, struct ucred *u2) 1467{ 1468 struct mac_biba *subj, *obj; 1469 1470 if (!mac_biba_enabled) 1471 return (0); 1472 1473 subj = SLOT(&u1->cr_label); 1474 obj = SLOT(&u2->cr_label); 1475 1476 /* XXX: range */ 1477 if (!mac_biba_dominate_single(obj, subj)) 1478 return (ESRCH); 1479 1480 return (0); 1481} 1482 1483static int 1484mac_biba_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet, 1485 struct label *ifnetlabel, struct label *newlabel) 1486{ 1487 struct mac_biba *subj, *new; 1488 int error; 1489 1490 subj = SLOT(&cred->cr_label); 1491 new = SLOT(newlabel); 1492 1493 /* 1494 * If there is a Biba label update for the interface, it may 1495 * be an update of the single, range, or both. 1496 */ 1497 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1498 if (error) 1499 return (error); 1500 1501 /* 1502 * Relabling network interfaces requires Biba privilege. 1503 */ 1504 error = mac_biba_subject_privileged(subj); 1505 if (error) 1506 return (error); 1507 1508 /* 1509 * If the Biba label is to be changed, authorize as appropriate. 1510 */ 1511 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1512 /* 1513 * Rely on the traditional superuser status for the Biba 1514 * interface relabel requirements. XXXMAC: This will go 1515 * away. 1516 */ 1517 error = suser_cred(cred, 0); 1518 if (error) 1519 return (EPERM); 1520 1521 /* 1522 * XXXMAC: Additional consistency tests regarding the single 1523 * and the range of the new label might be performed here. 1524 */ 1525 } 1526 1527 return (0); 1528} 1529 1530static int 1531mac_biba_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel, 1532 struct mbuf *m, struct label *mbuflabel) 1533{ 1534 struct mac_biba *p, *i; 1535 1536 if (!mac_biba_enabled) 1537 return (0); 1538 1539 p = SLOT(mbuflabel); 1540 i = SLOT(ifnetlabel); 1541 1542 return (mac_biba_single_in_range(p, i) ? 0 : EACCES); 1543} 1544 1545static int 1546mac_biba_check_mount_stat(struct ucred *cred, struct mount *mp, 1547 struct label *mntlabel) 1548{ 1549 struct mac_biba *subj, *obj; 1550 1551 if (!mac_biba_enabled) 1552 return (0); 1553 1554 subj = SLOT(&cred->cr_label); 1555 obj = SLOT(mntlabel); 1556 1557 if (!mac_biba_dominate_single(obj, subj)) 1558 return (EACCES); 1559 1560 return (0); 1561} 1562 1563static int 1564mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, 1565 struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data) 1566{ 1567 1568 if(!mac_biba_enabled) 1569 return (0); 1570 1571 /* XXX: This will be implemented soon... */ 1572 1573 return (0); 1574} 1575 1576static int 1577mac_biba_check_pipe_poll(struct ucred *cred, struct pipe *pipe, 1578 struct label *pipelabel) 1579{ 1580 struct mac_biba *subj, *obj; 1581 1582 if (!mac_biba_enabled) 1583 return (0); 1584 1585 subj = SLOT(&cred->cr_label); 1586 obj = SLOT((pipelabel)); 1587 1588 if (!mac_biba_dominate_single(obj, subj)) 1589 return (EACCES); 1590 1591 return (0); 1592} 1593 1594static int 1595mac_biba_check_pipe_read(struct ucred *cred, struct pipe *pipe, 1596 struct label *pipelabel) 1597{ 1598 struct mac_biba *subj, *obj; 1599 1600 if (!mac_biba_enabled) 1601 return (0); 1602 1603 subj = SLOT(&cred->cr_label); 1604 obj = SLOT((pipelabel)); 1605 1606 if (!mac_biba_dominate_single(obj, subj)) 1607 return (EACCES); 1608 1609 return (0); 1610} 1611 1612static int 1613mac_biba_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 1614 struct label *pipelabel, struct label *newlabel) 1615{ 1616 struct mac_biba *subj, *obj, *new; 1617 int error; 1618 1619 new = SLOT(newlabel); 1620 subj = SLOT(&cred->cr_label); 1621 obj = SLOT(pipelabel); 1622 1623 /* 1624 * If there is a Biba label update for a pipe, it must be a 1625 * single update. 1626 */ 1627 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 1628 if (error) 1629 return (error); 1630 1631 /* 1632 * To perform a relabel of a pipe (Biba label or not), Biba must 1633 * authorize the relabel. 1634 */ 1635 if (!mac_biba_single_in_range(obj, subj)) 1636 return (EPERM); 1637 1638 /* 1639 * If the Biba label is to be changed, authorize as appropriate. 1640 */ 1641 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 1642 /* 1643 * To change the Biba label on a pipe, the new pipe label 1644 * must be in the subject range. 1645 */ 1646 if (!mac_biba_single_in_range(new, subj)) 1647 return (EPERM); 1648 1649 /* 1650 * To change the Biba label on a pipe to be EQUAL, the 1651 * subject must have appropriate privilege. 1652 */ 1653 if (mac_biba_contains_equal(new)) { 1654 error = mac_biba_subject_privileged(subj); 1655 if (error) 1656 return (error); 1657 } 1658 } 1659 1660 return (0); 1661} 1662 1663static int 1664mac_biba_check_pipe_stat(struct ucred *cred, struct pipe *pipe, 1665 struct label *pipelabel) 1666{ 1667 struct mac_biba *subj, *obj; 1668 1669 if (!mac_biba_enabled) 1670 return (0); 1671 1672 subj = SLOT(&cred->cr_label); 1673 obj = SLOT((pipelabel)); 1674 1675 if (!mac_biba_dominate_single(obj, subj)) 1676 return (EACCES); 1677 1678 return (0); 1679} 1680 1681static int 1682mac_biba_check_pipe_write(struct ucred *cred, struct pipe *pipe, 1683 struct label *pipelabel) 1684{ 1685 struct mac_biba *subj, *obj; 1686 1687 if (!mac_biba_enabled) 1688 return (0); 1689 1690 subj = SLOT(&cred->cr_label); 1691 obj = SLOT((pipelabel)); 1692 1693 if (!mac_biba_dominate_single(subj, obj)) 1694 return (EACCES); 1695 1696 return (0); 1697} 1698 1699static int 1700mac_biba_check_proc_debug(struct ucred *cred, struct proc *proc) 1701{ 1702 struct mac_biba *subj, *obj; 1703 1704 if (!mac_biba_enabled) 1705 return (0); 1706 1707 subj = SLOT(&cred->cr_label); 1708 obj = SLOT(&proc->p_ucred->cr_label); 1709 1710 /* XXX: range checks */ 1711 if (!mac_biba_dominate_single(obj, subj)) 1712 return (ESRCH); 1713 if (!mac_biba_dominate_single(subj, obj)) 1714 return (EACCES); 1715 1716 return (0); 1717} 1718 1719static int 1720mac_biba_check_proc_sched(struct ucred *cred, struct proc *proc) 1721{ 1722 struct mac_biba *subj, *obj; 1723 1724 if (!mac_biba_enabled) 1725 return (0); 1726 1727 subj = SLOT(&cred->cr_label); 1728 obj = SLOT(&proc->p_ucred->cr_label); 1729 1730 /* XXX: range checks */ 1731 if (!mac_biba_dominate_single(obj, subj)) 1732 return (ESRCH); 1733 if (!mac_biba_dominate_single(subj, obj)) 1734 return (EACCES); 1735 1736 return (0); 1737} 1738 1739static int 1740mac_biba_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 1741{ 1742 struct mac_biba *subj, *obj; 1743 1744 if (!mac_biba_enabled) 1745 return (0); 1746 1747 subj = SLOT(&cred->cr_label); 1748 obj = SLOT(&proc->p_ucred->cr_label); 1749 1750 /* XXX: range checks */ 1751 if (!mac_biba_dominate_single(obj, subj)) 1752 return (ESRCH); 1753 if (!mac_biba_dominate_single(subj, obj)) 1754 return (EACCES); 1755 1756 return (0); 1757} 1758 1759static int 1760mac_biba_check_socket_deliver(struct socket *so, struct label *socketlabel, 1761 struct mbuf *m, struct label *mbuflabel) 1762{ 1763 struct mac_biba *p, *s; 1764 1765 if (!mac_biba_enabled) 1766 return (0); 1767 1768 p = SLOT(mbuflabel); 1769 s = SLOT(socketlabel); 1770 1771 return (mac_biba_equal_single(p, s) ? 0 : EACCES); 1772} 1773 1774static int 1775mac_biba_check_socket_relabel(struct ucred *cred, struct socket *so, 1776 struct label *socketlabel, struct label *newlabel) 1777{ 1778 struct mac_biba *subj, *obj, *new; 1779 int error; 1780 1781 new = SLOT(newlabel); 1782 subj = SLOT(&cred->cr_label); 1783 obj = SLOT(socketlabel); 1784 1785 /* 1786 * If there is a Biba label update for the socket, it may be 1787 * an update of single. 1788 */ 1789 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 1790 if (error) 1791 return (error); 1792 1793 /* 1794 * To relabel a socket, the old socket single must be in the subject 1795 * range. 1796 */ 1797 if (!mac_biba_single_in_range(obj, subj)) 1798 return (EPERM); 1799 1800 /* 1801 * If the Biba label is to be changed, authorize as appropriate. 1802 */ 1803 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 1804 /* 1805 * To relabel a socket, the new socket single must be in 1806 * the subject range. 1807 */ 1808 if (!mac_biba_single_in_range(new, subj)) 1809 return (EPERM); 1810 1811 /* 1812 * To change the Biba label on the socket to contain EQUAL, 1813 * the subject must have appropriate privilege. 1814 */ 1815 if (mac_biba_contains_equal(new)) { 1816 error = mac_biba_subject_privileged(subj); 1817 if (error) 1818 return (error); 1819 } 1820 } 1821 1822 return (0); 1823} 1824 1825static int 1826mac_biba_check_socket_visible(struct ucred *cred, struct socket *socket, 1827 struct label *socketlabel) 1828{ 1829 struct mac_biba *subj, *obj; 1830 1831 if (!mac_biba_enabled) 1832 return (0); 1833 1834 subj = SLOT(&cred->cr_label); 1835 obj = SLOT(socketlabel); 1836 1837 if (!mac_biba_dominate_single(obj, subj)) 1838 return (ENOENT); 1839 1840 return (0); 1841} 1842 1843static int 1844mac_biba_check_system_acct(struct ucred *cred, struct vnode *vp, 1845 struct label *label) 1846{ 1847 struct mac_biba *subj, *obj; 1848 int error; 1849 1850 if (!mac_biba_enabled) 1851 return (0); 1852 1853 subj = SLOT(&cred->cr_label); 1854 1855 error = mac_biba_subject_privileged(subj); 1856 if (error) 1857 return (error); 1858 1859 if (label == NULL) 1860 return (0); 1861 1862 obj = SLOT(label); 1863 if (!mac_biba_high_single(obj)) 1864 return (EACCES); 1865 1866 return (0); 1867} 1868 1869static int 1870mac_biba_check_system_settime(struct ucred *cred) 1871{ 1872 struct mac_biba *subj; 1873 int error; 1874 1875 if (!mac_biba_enabled) 1876 return (0); 1877 1878 subj = SLOT(&cred->cr_label); 1879 1880 error = mac_biba_subject_privileged(subj); 1881 if (error) 1882 return (error); 1883 1884 return (0); 1885} 1886 1887static int 1888mac_biba_check_system_swapon(struct ucred *cred, struct vnode *vp, 1889 struct label *label) 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 obj = SLOT(label); 1899 1900 error = mac_biba_subject_privileged(subj); 1901 if (error) 1902 return (error); 1903 1904 if (!mac_biba_high_single(obj)) 1905 return (EACCES); 1906 1907 return (0); 1908} 1909 1910static int 1911mac_biba_check_system_sysctl(struct ucred *cred, int *name, u_int namelen, 1912 void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen) 1913{ 1914 struct mac_biba *subj; 1915 int error; 1916 1917 if (!mac_biba_enabled) 1918 return (0); 1919 1920 subj = SLOT(&cred->cr_label); 1921 1922 /* 1923 * In general, treat sysctl variables as biba/high, but also 1924 * require privilege to change them, since they are a 1925 * communications channel between grades. Exempt MIB 1926 * queries from this due to undocmented sysctl magic. 1927 * XXXMAC: This probably requires some more review. 1928 */ 1929 if (new != NULL) { 1930 if (namelen > 0 && name[0] == 0) 1931 return (0); 1932 1933 if (!mac_biba_subject_dominate_high(subj)) 1934 return (EACCES); 1935 1936 error = mac_biba_subject_privileged(subj); 1937 if (error) 1938 return (error); 1939 } 1940 1941 return (0); 1942} 1943 1944static int 1945mac_biba_check_vnode_chdir(struct ucred *cred, struct vnode *dvp, 1946 struct label *dlabel) 1947{ 1948 struct mac_biba *subj, *obj; 1949 1950 if (!mac_biba_enabled) 1951 return (0); 1952 1953 subj = SLOT(&cred->cr_label); 1954 obj = SLOT(dlabel); 1955 1956 if (!mac_biba_dominate_single(obj, subj)) 1957 return (EACCES); 1958 1959 return (0); 1960} 1961 1962static int 1963mac_biba_check_vnode_chroot(struct ucred *cred, struct vnode *dvp, 1964 struct label *dlabel) 1965{ 1966 struct mac_biba *subj, *obj; 1967 1968 if (!mac_biba_enabled) 1969 return (0); 1970 1971 subj = SLOT(&cred->cr_label); 1972 obj = SLOT(dlabel); 1973 1974 if (!mac_biba_dominate_single(obj, subj)) 1975 return (EACCES); 1976 1977 return (0); 1978} 1979 1980static int 1981mac_biba_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1982 struct label *dlabel, struct componentname *cnp, struct vattr *vap) 1983{ 1984 struct mac_biba *subj, *obj; 1985 1986 if (!mac_biba_enabled) 1987 return (0); 1988 1989 subj = SLOT(&cred->cr_label); 1990 obj = SLOT(dlabel); 1991 1992 if (!mac_biba_dominate_single(subj, obj)) 1993 return (EACCES); 1994 1995 return (0); 1996} 1997 1998static int 1999mac_biba_check_vnode_delete(struct ucred *cred, struct vnode *dvp, 2000 struct label *dlabel, struct vnode *vp, struct label *label, 2001 struct componentname *cnp) 2002{ 2003 struct mac_biba *subj, *obj; 2004 2005 if (!mac_biba_enabled) 2006 return (0); 2007 2008 subj = SLOT(&cred->cr_label); 2009 obj = SLOT(dlabel); 2010 2011 if (!mac_biba_dominate_single(subj, obj)) 2012 return (EACCES); 2013 2014 obj = SLOT(label); 2015 2016 if (!mac_biba_dominate_single(subj, obj)) 2017 return (EACCES); 2018 2019 return (0); 2020} 2021 2022static int 2023mac_biba_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 2024 struct label *label, acl_type_t type) 2025{ 2026 struct mac_biba *subj, *obj; 2027 2028 if (!mac_biba_enabled) 2029 return (0); 2030 2031 subj = SLOT(&cred->cr_label); 2032 obj = SLOT(label); 2033 2034 if (!mac_biba_dominate_single(subj, obj)) 2035 return (EACCES); 2036 2037 return (0); 2038} 2039 2040static int 2041mac_biba_check_vnode_exec(struct ucred *cred, struct vnode *vp, 2042 struct label *label, struct image_params *imgp, 2043 struct label *execlabel) 2044{ 2045 struct mac_biba *subj, *obj, *exec; 2046 int error; 2047 2048 if (execlabel != NULL) { 2049 /* 2050 * We currently don't permit labels to be changed at 2051 * exec-time as part of Biba, so disallow non-NULL 2052 * Biba label elements in the execlabel. 2053 */ 2054 exec = SLOT(execlabel); 2055 error = biba_atmostflags(exec, 0); 2056 if (error) 2057 return (error); 2058 } 2059 2060 if (!mac_biba_enabled) 2061 return (0); 2062 2063 subj = SLOT(&cred->cr_label); 2064 obj = SLOT(label); 2065 2066 if (!mac_biba_dominate_single(obj, subj)) 2067 return (EACCES); 2068 2069 return (0); 2070} 2071 2072static int 2073mac_biba_check_vnode_getacl(struct ucred *cred, struct vnode *vp, 2074 struct label *label, acl_type_t type) 2075{ 2076 struct mac_biba *subj, *obj; 2077 2078 if (!mac_biba_enabled) 2079 return (0); 2080 2081 subj = SLOT(&cred->cr_label); 2082 obj = SLOT(label); 2083 2084 if (!mac_biba_dominate_single(obj, subj)) 2085 return (EACCES); 2086 2087 return (0); 2088} 2089 2090static int 2091mac_biba_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 2092 struct label *label, int attrnamespace, const char *name, struct uio *uio) 2093{ 2094 struct mac_biba *subj, *obj; 2095 2096 if (!mac_biba_enabled) 2097 return (0); 2098 2099 subj = SLOT(&cred->cr_label); 2100 obj = SLOT(label); 2101 2102 if (!mac_biba_dominate_single(obj, subj)) 2103 return (EACCES); 2104 2105 return (0); 2106} 2107 2108static int 2109mac_biba_check_vnode_link(struct ucred *cred, struct vnode *dvp, 2110 struct label *dlabel, struct vnode *vp, struct label *label, 2111 struct componentname *cnp) 2112{ 2113 struct mac_biba *subj, *obj; 2114 2115 if (!mac_biba_enabled) 2116 return (0); 2117 2118 subj = SLOT(&cred->cr_label); 2119 obj = SLOT(dlabel); 2120 2121 if (!mac_biba_dominate_single(subj, obj)) 2122 return (EACCES); 2123 2124 obj = SLOT(label); 2125 2126 if (!mac_biba_dominate_single(subj, obj)) 2127 return (EACCES); 2128 2129 return (0); 2130} 2131 2132static int 2133mac_biba_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 2134 struct label *dlabel, struct componentname *cnp) 2135{ 2136 struct mac_biba *subj, *obj; 2137 2138 if (!mac_biba_enabled) 2139 return (0); 2140 2141 subj = SLOT(&cred->cr_label); 2142 obj = SLOT(dlabel); 2143 2144 if (!mac_biba_dominate_single(obj, subj)) 2145 return (EACCES); 2146 2147 return (0); 2148} 2149 2150static int 2151mac_biba_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 2152 struct label *label, int prot) 2153{ 2154 struct mac_biba *subj, *obj; 2155 2156 /* 2157 * Rely on the use of open()-time protections to handle 2158 * non-revocation cases. 2159 */ 2160 if (!mac_biba_enabled || !revocation_enabled) 2161 return (0); 2162 2163 subj = SLOT(&cred->cr_label); 2164 obj = SLOT(label); 2165 2166 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2167 if (!mac_biba_dominate_single(obj, subj)) 2168 return (EACCES); 2169 } 2170 if (prot & VM_PROT_WRITE) { 2171 if (!mac_biba_dominate_single(subj, obj)) 2172 return (EACCES); 2173 } 2174 2175 return (0); 2176} 2177 2178static int 2179mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp, 2180 struct label *vnodelabel, int acc_mode) 2181{ 2182 struct mac_biba *subj, *obj; 2183 2184 if (!mac_biba_enabled) 2185 return (0); 2186 2187 subj = SLOT(&cred->cr_label); 2188 obj = SLOT(vnodelabel); 2189 2190 /* XXX privilege override for admin? */ 2191 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2192 if (!mac_biba_dominate_single(obj, subj)) 2193 return (EACCES); 2194 } 2195 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2196 if (!mac_biba_dominate_single(subj, obj)) 2197 return (EACCES); 2198 } 2199 2200 return (0); 2201} 2202 2203static int 2204mac_biba_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 2205 struct vnode *vp, struct label *label) 2206{ 2207 struct mac_biba *subj, *obj; 2208 2209 if (!mac_biba_enabled || !revocation_enabled) 2210 return (0); 2211 2212 subj = SLOT(&active_cred->cr_label); 2213 obj = SLOT(label); 2214 2215 if (!mac_biba_dominate_single(obj, subj)) 2216 return (EACCES); 2217 2218 return (0); 2219} 2220 2221static int 2222mac_biba_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 2223 struct vnode *vp, struct label *label) 2224{ 2225 struct mac_biba *subj, *obj; 2226 2227 if (!mac_biba_enabled || !revocation_enabled) 2228 return (0); 2229 2230 subj = SLOT(&active_cred->cr_label); 2231 obj = SLOT(label); 2232 2233 if (!mac_biba_dominate_single(obj, subj)) 2234 return (EACCES); 2235 2236 return (0); 2237} 2238 2239static int 2240mac_biba_check_vnode_readdir(struct ucred *cred, struct vnode *dvp, 2241 struct label *dlabel) 2242{ 2243 struct mac_biba *subj, *obj; 2244 2245 if (!mac_biba_enabled) 2246 return (0); 2247 2248 subj = SLOT(&cred->cr_label); 2249 obj = SLOT(dlabel); 2250 2251 if (!mac_biba_dominate_single(obj, subj)) 2252 return (EACCES); 2253 2254 return (0); 2255} 2256 2257static int 2258mac_biba_check_vnode_readlink(struct ucred *cred, struct vnode *vp, 2259 struct label *label) 2260{ 2261 struct mac_biba *subj, *obj; 2262 2263 if (!mac_biba_enabled) 2264 return (0); 2265 2266 subj = SLOT(&cred->cr_label); 2267 obj = SLOT(label); 2268 2269 if (!mac_biba_dominate_single(obj, subj)) 2270 return (EACCES); 2271 2272 return (0); 2273} 2274 2275static int 2276mac_biba_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 2277 struct label *vnodelabel, struct label *newlabel) 2278{ 2279 struct mac_biba *old, *new, *subj; 2280 int error; 2281 2282 old = SLOT(vnodelabel); 2283 new = SLOT(newlabel); 2284 subj = SLOT(&cred->cr_label); 2285 2286 /* 2287 * If there is a Biba label update for the vnode, it must be a 2288 * single label. 2289 */ 2290 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 2291 if (error) 2292 return (error); 2293 2294 /* 2295 * To perform a relabel of the vnode (Biba label or not), Biba must 2296 * authorize the relabel. 2297 */ 2298 if (!mac_biba_single_in_range(old, subj)) 2299 return (EPERM); 2300 2301 /* 2302 * If the Biba label is to be changed, authorize as appropriate. 2303 */ 2304 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 2305 /* 2306 * To change the Biba label on a vnode, the new vnode label 2307 * must be in the subject range. 2308 */ 2309 if (!mac_biba_single_in_range(new, subj)) 2310 return (EPERM); 2311 2312 /* 2313 * To change the Biba label on the vnode to be EQUAL, 2314 * the subject must have appropriate privilege. 2315 */ 2316 if (mac_biba_contains_equal(new)) { 2317 error = mac_biba_subject_privileged(subj); 2318 if (error) 2319 return (error); 2320 } 2321 } 2322 2323 return (0); 2324} 2325 2326static int 2327mac_biba_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 2328 struct label *dlabel, struct vnode *vp, struct label *label, 2329 struct componentname *cnp) 2330{ 2331 struct mac_biba *subj, *obj; 2332 2333 if (!mac_biba_enabled) 2334 return (0); 2335 2336 subj = SLOT(&cred->cr_label); 2337 obj = SLOT(dlabel); 2338 2339 if (!mac_biba_dominate_single(subj, obj)) 2340 return (EACCES); 2341 2342 obj = SLOT(label); 2343 2344 if (!mac_biba_dominate_single(subj, obj)) 2345 return (EACCES); 2346 2347 return (0); 2348} 2349 2350static int 2351mac_biba_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 2352 struct label *dlabel, struct vnode *vp, struct label *label, int samedir, 2353 struct componentname *cnp) 2354{ 2355 struct mac_biba *subj, *obj; 2356 2357 if (!mac_biba_enabled) 2358 return (0); 2359 2360 subj = SLOT(&cred->cr_label); 2361 obj = SLOT(dlabel); 2362 2363 if (!mac_biba_dominate_single(subj, obj)) 2364 return (EACCES); 2365 2366 if (vp != NULL) { 2367 obj = SLOT(label); 2368 2369 if (!mac_biba_dominate_single(subj, obj)) 2370 return (EACCES); 2371 } 2372 2373 return (0); 2374} 2375 2376static int 2377mac_biba_check_vnode_revoke(struct ucred *cred, struct vnode *vp, 2378 struct label *label) 2379{ 2380 struct mac_biba *subj, *obj; 2381 2382 if (!mac_biba_enabled) 2383 return (0); 2384 2385 subj = SLOT(&cred->cr_label); 2386 obj = SLOT(label); 2387 2388 if (!mac_biba_dominate_single(subj, obj)) 2389 return (EACCES); 2390 2391 return (0); 2392} 2393 2394static int 2395mac_biba_check_vnode_setacl(struct ucred *cred, struct vnode *vp, 2396 struct label *label, acl_type_t type, struct acl *acl) 2397{ 2398 struct mac_biba *subj, *obj; 2399 2400 if (!mac_biba_enabled) 2401 return (0); 2402 2403 subj = SLOT(&cred->cr_label); 2404 obj = SLOT(label); 2405 2406 if (!mac_biba_dominate_single(subj, obj)) 2407 return (EACCES); 2408 2409 return (0); 2410} 2411 2412static int 2413mac_biba_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 2414 struct label *vnodelabel, int attrnamespace, const char *name, 2415 struct uio *uio) 2416{ 2417 struct mac_biba *subj, *obj; 2418 2419 if (!mac_biba_enabled) 2420 return (0); 2421 2422 subj = SLOT(&cred->cr_label); 2423 obj = SLOT(vnodelabel); 2424 2425 if (!mac_biba_dominate_single(subj, obj)) 2426 return (EACCES); 2427 2428 /* XXX: protect the MAC EA in a special way? */ 2429 2430 return (0); 2431} 2432 2433static int 2434mac_biba_check_vnode_setflags(struct ucred *cred, struct vnode *vp, 2435 struct label *vnodelabel, u_long flags) 2436{ 2437 struct mac_biba *subj, *obj; 2438 2439 if (!mac_biba_enabled) 2440 return (0); 2441 2442 subj = SLOT(&cred->cr_label); 2443 obj = SLOT(vnodelabel); 2444 2445 if (!mac_biba_dominate_single(subj, obj)) 2446 return (EACCES); 2447 2448 return (0); 2449} 2450 2451static int 2452mac_biba_check_vnode_setmode(struct ucred *cred, struct vnode *vp, 2453 struct label *vnodelabel, mode_t mode) 2454{ 2455 struct mac_biba *subj, *obj; 2456 2457 if (!mac_biba_enabled) 2458 return (0); 2459 2460 subj = SLOT(&cred->cr_label); 2461 obj = SLOT(vnodelabel); 2462 2463 if (!mac_biba_dominate_single(subj, obj)) 2464 return (EACCES); 2465 2466 return (0); 2467} 2468 2469static int 2470mac_biba_check_vnode_setowner(struct ucred *cred, struct vnode *vp, 2471 struct label *vnodelabel, uid_t uid, gid_t gid) 2472{ 2473 struct mac_biba *subj, *obj; 2474 2475 if (!mac_biba_enabled) 2476 return (0); 2477 2478 subj = SLOT(&cred->cr_label); 2479 obj = SLOT(vnodelabel); 2480 2481 if (!mac_biba_dominate_single(subj, obj)) 2482 return (EACCES); 2483 2484 return (0); 2485} 2486 2487static int 2488mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 2489 struct label *vnodelabel, struct timespec atime, struct timespec mtime) 2490{ 2491 struct mac_biba *subj, *obj; 2492 2493 if (!mac_biba_enabled) 2494 return (0); 2495 2496 subj = SLOT(&cred->cr_label); 2497 obj = SLOT(vnodelabel); 2498 2499 if (!mac_biba_dominate_single(subj, obj)) 2500 return (EACCES); 2501 2502 return (0); 2503} 2504 2505static int 2506mac_biba_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2507 struct vnode *vp, struct label *vnodelabel) 2508{ 2509 struct mac_biba *subj, *obj; 2510 2511 if (!mac_biba_enabled) 2512 return (0); 2513 2514 subj = SLOT(&active_cred->cr_label); 2515 obj = SLOT(vnodelabel); 2516 2517 if (!mac_biba_dominate_single(obj, subj)) 2518 return (EACCES); 2519 2520 return (0); 2521} 2522 2523static int 2524mac_biba_check_vnode_write(struct ucred *active_cred, 2525 struct ucred *file_cred, struct vnode *vp, struct label *label) 2526{ 2527 struct mac_biba *subj, *obj; 2528 2529 if (!mac_biba_enabled || !revocation_enabled) 2530 return (0); 2531 2532 subj = SLOT(&active_cred->cr_label); 2533 obj = SLOT(label); 2534 2535 if (!mac_biba_dominate_single(subj, obj)) 2536 return (EACCES); 2537 2538 return (0); 2539} 2540 2541static struct mac_policy_ops mac_biba_ops = 2542{ 2543 .mpo_destroy = mac_biba_destroy, 2544 .mpo_init = mac_biba_init, 2545 .mpo_init_bpfdesc_label = mac_biba_init_label, 2546 .mpo_init_cred_label = mac_biba_init_label, 2547 .mpo_init_devfsdirent_label = mac_biba_init_label, 2548 .mpo_init_ifnet_label = mac_biba_init_label, 2549 .mpo_init_ipq_label = mac_biba_init_label, 2550 .mpo_init_mbuf_label = mac_biba_init_label_waitcheck, 2551 .mpo_init_mount_label = mac_biba_init_label, 2552 .mpo_init_mount_fs_label = mac_biba_init_label, 2553 .mpo_init_pipe_label = mac_biba_init_label, 2554 .mpo_init_socket_label = mac_biba_init_label_waitcheck, 2555 .mpo_init_socket_peer_label = mac_biba_init_label_waitcheck, 2556 .mpo_init_vnode_label = mac_biba_init_label, 2557 .mpo_destroy_bpfdesc_label = mac_biba_destroy_label, 2558 .mpo_destroy_cred_label = mac_biba_destroy_label, 2559 .mpo_destroy_devfsdirent_label = mac_biba_destroy_label, 2560 .mpo_destroy_ifnet_label = mac_biba_destroy_label, 2561 .mpo_destroy_ipq_label = mac_biba_destroy_label, 2562 .mpo_destroy_mbuf_label = mac_biba_destroy_label, 2563 .mpo_destroy_mount_label = mac_biba_destroy_label, 2564 .mpo_destroy_mount_fs_label = mac_biba_destroy_label, 2565 .mpo_destroy_pipe_label = mac_biba_destroy_label, 2566 .mpo_destroy_socket_label = mac_biba_destroy_label, 2567 .mpo_destroy_socket_peer_label = mac_biba_destroy_label, 2568 .mpo_destroy_vnode_label = mac_biba_destroy_label, 2569 .mpo_copy_pipe_label = mac_biba_copy_label, 2570 .mpo_copy_vnode_label = mac_biba_copy_label, 2571 .mpo_externalize_cred_label = mac_biba_externalize_label, 2572 .mpo_externalize_ifnet_label = mac_biba_externalize_label, 2573 .mpo_externalize_pipe_label = mac_biba_externalize_label, 2574 .mpo_externalize_socket_label = mac_biba_externalize_label, 2575 .mpo_externalize_socket_peer_label = mac_biba_externalize_label, 2576 .mpo_externalize_vnode_label = mac_biba_externalize_label, 2577 .mpo_internalize_cred_label = mac_biba_internalize_label, 2578 .mpo_internalize_ifnet_label = mac_biba_internalize_label, 2579 .mpo_internalize_pipe_label = mac_biba_internalize_label, 2580 .mpo_internalize_socket_label = mac_biba_internalize_label, 2581 .mpo_internalize_vnode_label = mac_biba_internalize_label, 2582 .mpo_create_devfs_device = mac_biba_create_devfs_device, 2583 .mpo_create_devfs_directory = mac_biba_create_devfs_directory, 2584 .mpo_create_devfs_symlink = mac_biba_create_devfs_symlink, 2585 .mpo_create_mount = mac_biba_create_mount, 2586 .mpo_create_root_mount = mac_biba_create_root_mount, 2587 .mpo_relabel_vnode = mac_biba_relabel_vnode, 2588 .mpo_update_devfsdirent = mac_biba_update_devfsdirent, 2589 .mpo_associate_vnode_devfs = mac_biba_associate_vnode_devfs, 2590 .mpo_associate_vnode_extattr = mac_biba_associate_vnode_extattr, 2591 .mpo_associate_vnode_singlelabel = mac_biba_associate_vnode_singlelabel, 2592 .mpo_create_vnode_extattr = mac_biba_create_vnode_extattr, 2593 .mpo_setlabel_vnode_extattr = mac_biba_setlabel_vnode_extattr, 2594 .mpo_create_mbuf_from_socket = mac_biba_create_mbuf_from_socket, 2595 .mpo_create_pipe = mac_biba_create_pipe, 2596 .mpo_create_socket = mac_biba_create_socket, 2597 .mpo_create_socket_from_socket = mac_biba_create_socket_from_socket, 2598 .mpo_relabel_pipe = mac_biba_relabel_pipe, 2599 .mpo_relabel_socket = mac_biba_relabel_socket, 2600 .mpo_set_socket_peer_from_mbuf = mac_biba_set_socket_peer_from_mbuf, 2601 .mpo_set_socket_peer_from_socket = mac_biba_set_socket_peer_from_socket, 2602 .mpo_create_bpfdesc = mac_biba_create_bpfdesc, 2603 .mpo_create_datagram_from_ipq = mac_biba_create_datagram_from_ipq, 2604 .mpo_create_fragment = mac_biba_create_fragment, 2605 .mpo_create_ifnet = mac_biba_create_ifnet, 2606 .mpo_create_ipq = mac_biba_create_ipq, 2607 .mpo_create_mbuf_from_mbuf = mac_biba_create_mbuf_from_mbuf, 2608 .mpo_create_mbuf_linklayer = mac_biba_create_mbuf_linklayer, 2609 .mpo_create_mbuf_from_bpfdesc = mac_biba_create_mbuf_from_bpfdesc, 2610 .mpo_create_mbuf_from_ifnet = mac_biba_create_mbuf_from_ifnet, 2611 .mpo_create_mbuf_multicast_encap = mac_biba_create_mbuf_multicast_encap, 2612 .mpo_create_mbuf_netlayer = mac_biba_create_mbuf_netlayer, 2613 .mpo_fragment_match = mac_biba_fragment_match, 2614 .mpo_relabel_ifnet = mac_biba_relabel_ifnet, 2615 .mpo_update_ipq = mac_biba_update_ipq, 2616 .mpo_create_cred = mac_biba_create_cred, 2617 .mpo_create_proc0 = mac_biba_create_proc0, 2618 .mpo_create_proc1 = mac_biba_create_proc1, 2619 .mpo_relabel_cred = mac_biba_relabel_cred, 2620 .mpo_check_bpfdesc_receive = mac_biba_check_bpfdesc_receive, 2621 .mpo_check_cred_relabel = mac_biba_check_cred_relabel, 2622 .mpo_check_cred_visible = mac_biba_check_cred_visible, 2623 .mpo_check_ifnet_relabel = mac_biba_check_ifnet_relabel, 2624 .mpo_check_ifnet_transmit = mac_biba_check_ifnet_transmit, 2625 .mpo_check_mount_stat = mac_biba_check_mount_stat, 2626 .mpo_check_pipe_ioctl = mac_biba_check_pipe_ioctl, 2627 .mpo_check_pipe_poll = mac_biba_check_pipe_poll, 2628 .mpo_check_pipe_read = mac_biba_check_pipe_read, 2629 .mpo_check_pipe_relabel = mac_biba_check_pipe_relabel, 2630 .mpo_check_pipe_stat = mac_biba_check_pipe_stat, 2631 .mpo_check_pipe_write = mac_biba_check_pipe_write, 2632 .mpo_check_proc_debug = mac_biba_check_proc_debug, 2633 .mpo_check_proc_sched = mac_biba_check_proc_sched, 2634 .mpo_check_proc_signal = mac_biba_check_proc_signal, 2635 .mpo_check_socket_deliver = mac_biba_check_socket_deliver, 2636 .mpo_check_socket_relabel = mac_biba_check_socket_relabel, 2637 .mpo_check_socket_visible = mac_biba_check_socket_visible, 2638 .mpo_check_system_acct = mac_biba_check_system_acct, 2639 .mpo_check_system_settime = mac_biba_check_system_settime, 2640 .mpo_check_system_swapon = mac_biba_check_system_swapon, 2641 .mpo_check_system_sysctl = mac_biba_check_system_sysctl, 2642 .mpo_check_vnode_access = mac_biba_check_vnode_open, 2643 .mpo_check_vnode_chdir = mac_biba_check_vnode_chdir, 2644 .mpo_check_vnode_chroot = mac_biba_check_vnode_chroot, 2645 .mpo_check_vnode_create = mac_biba_check_vnode_create, 2646 .mpo_check_vnode_delete = mac_biba_check_vnode_delete, 2647 .mpo_check_vnode_deleteacl = mac_biba_check_vnode_deleteacl, 2648 .mpo_check_vnode_exec = mac_biba_check_vnode_exec, 2649 .mpo_check_vnode_getacl = mac_biba_check_vnode_getacl, 2650 .mpo_check_vnode_getextattr = mac_biba_check_vnode_getextattr, 2651 .mpo_check_vnode_link = mac_biba_check_vnode_link, 2652 .mpo_check_vnode_lookup = mac_biba_check_vnode_lookup, 2653 .mpo_check_vnode_mmap = mac_biba_check_vnode_mmap, 2654 .mpo_check_vnode_mprotect = mac_biba_check_vnode_mmap, 2655 .mpo_check_vnode_open = mac_biba_check_vnode_open, 2656 .mpo_check_vnode_poll = mac_biba_check_vnode_poll, 2657 .mpo_check_vnode_read = mac_biba_check_vnode_read, 2658 .mpo_check_vnode_readdir = mac_biba_check_vnode_readdir, 2659 .mpo_check_vnode_readlink = mac_biba_check_vnode_readlink, 2660 .mpo_check_vnode_relabel = mac_biba_check_vnode_relabel, 2661 .mpo_check_vnode_rename_from = mac_biba_check_vnode_rename_from, 2662 .mpo_check_vnode_rename_to = mac_biba_check_vnode_rename_to, 2663 .mpo_check_vnode_revoke = mac_biba_check_vnode_revoke, 2664 .mpo_check_vnode_setacl = mac_biba_check_vnode_setacl, 2665 .mpo_check_vnode_setextattr = mac_biba_check_vnode_setextattr, 2666 .mpo_check_vnode_setflags = mac_biba_check_vnode_setflags, 2667 .mpo_check_vnode_setmode = mac_biba_check_vnode_setmode, 2668 .mpo_check_vnode_setowner = mac_biba_check_vnode_setowner, 2669 .mpo_check_vnode_setutimes = mac_biba_check_vnode_setutimes, 2670 .mpo_check_vnode_stat = mac_biba_check_vnode_stat, 2671 .mpo_check_vnode_write = mac_biba_check_vnode_write, 2672}; 2673 2674MAC_POLICY_SET(&mac_biba_ops, trustedbsd_mac_biba, "TrustedBSD MAC/Biba", 2675 MPC_LOADTIME_FLAG_NOTLATE, &mac_biba_slot); 2676