mac_biba.c revision 106089
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 NAI Labs, 9 * the Security Research Division of Network Associates, 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 * 3. The names of the authors may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * $FreeBSD: head/sys/security/mac_biba/mac_biba.c 106089 2002-10-28 19:16:44Z rwatson $ 38 */ 39 40/* 41 * Developed by the TrustedBSD Project. 42 * Biba fixed label mandatory integrity policy. 43 */ 44 45#include <sys/types.h> 46#include <sys/param.h> 47#include <sys/acl.h> 48#include <sys/conf.h> 49#include <sys/extattr.h> 50#include <sys/kernel.h> 51#include <sys/mac.h> 52#include <sys/malloc.h> 53#include <sys/mount.h> 54#include <sys/proc.h> 55#include <sys/systm.h> 56#include <sys/sysproto.h> 57#include <sys/sysent.h> 58#include <sys/systm.h> 59#include <sys/vnode.h> 60#include <sys/file.h> 61#include <sys/socket.h> 62#include <sys/socketvar.h> 63#include <sys/pipe.h> 64#include <sys/sysctl.h> 65 66#include <fs/devfs/devfs.h> 67 68#include <net/bpfdesc.h> 69#include <net/if.h> 70#include <net/if_types.h> 71#include <net/if_var.h> 72 73#include <netinet/in.h> 74#include <netinet/ip_var.h> 75 76#include <vm/vm.h> 77 78#include <sys/mac_policy.h> 79 80#include <security/mac_biba/mac_biba.h> 81 82SYSCTL_DECL(_security_mac); 83 84SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0, 85 "TrustedBSD mac_biba policy controls"); 86 87static int mac_biba_label_size = sizeof(struct mac_biba); 88SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD, 89 &mac_biba_label_size, 0, "Size of struct mac_biba"); 90 91static int mac_biba_enabled = 0; 92SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, 93 &mac_biba_enabled, 0, "Enforce MAC/Biba policy"); 94TUNABLE_INT("security.mac.biba.enabled", &mac_biba_enabled); 95 96static int destroyed_not_inited; 97SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 98 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 99 100static int trust_all_interfaces = 0; 101SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, 102 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); 103TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces); 104 105static char trusted_interfaces[128]; 106SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD, 107 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); 108TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces, 109 sizeof(trusted_interfaces)); 110 111static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS; 112SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD, 113 &max_compartments, 0, "Maximum supported compartments"); 114 115static int ptys_equal = 0; 116SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, 117 &ptys_equal, 0, "Label pty devices as biba/equal on create"); 118TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal); 119 120static int revocation_enabled = 0; 121SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW, 122 &revocation_enabled, 0, "Revoke access to objects on relabel"); 123TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled); 124 125static int mac_biba_slot; 126#define SLOT(l) ((struct mac_biba *)LABEL_TO_SLOT((l), mac_biba_slot).l_ptr) 127 128MALLOC_DEFINE(M_MACBIBA, "biba label", "MAC/Biba labels"); 129 130static __inline int 131biba_bit_set_empty(u_char *set) { 132 int i; 133 134 for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++) 135 if (set[i] != 0) 136 return (0); 137 return (1); 138} 139 140static struct mac_biba * 141biba_alloc(int flag) 142{ 143 struct mac_biba *mac_biba; 144 145 mac_biba = malloc(sizeof(struct mac_biba), M_MACBIBA, M_ZERO | flag); 146 147 return (mac_biba); 148} 149 150static void 151biba_free(struct mac_biba *mac_biba) 152{ 153 154 if (mac_biba != NULL) 155 free(mac_biba, M_MACBIBA); 156 else 157 atomic_add_int(&destroyed_not_inited, 1); 158} 159 160static int 161biba_atmostflags(struct mac_biba *mac_biba, int flags) 162{ 163 164 if ((mac_biba->mb_flags & flags) != mac_biba->mb_flags) 165 return (EINVAL); 166 return (0); 167} 168 169static int 170mac_biba_dominate_element(struct mac_biba_element *a, 171 struct mac_biba_element *b) 172{ 173 int bit; 174 175 switch (a->mbe_type) { 176 case MAC_BIBA_TYPE_EQUAL: 177 case MAC_BIBA_TYPE_HIGH: 178 return (1); 179 180 case MAC_BIBA_TYPE_LOW: 181 switch (b->mbe_type) { 182 case MAC_BIBA_TYPE_GRADE: 183 case MAC_BIBA_TYPE_HIGH: 184 return (0); 185 186 case MAC_BIBA_TYPE_EQUAL: 187 case MAC_BIBA_TYPE_LOW: 188 return (1); 189 190 default: 191 panic("mac_biba_dominate_element: b->mbe_type invalid"); 192 } 193 194 case MAC_BIBA_TYPE_GRADE: 195 switch (b->mbe_type) { 196 case MAC_BIBA_TYPE_EQUAL: 197 case MAC_BIBA_TYPE_LOW: 198 return (1); 199 200 case MAC_BIBA_TYPE_HIGH: 201 return (0); 202 203 case MAC_BIBA_TYPE_GRADE: 204 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) 205 if (!MAC_BIBA_BIT_TEST(bit, 206 a->mbe_compartments) && 207 MAC_BIBA_BIT_TEST(bit, b->mbe_compartments)) 208 return (0); 209 return (a->mbe_grade >= b->mbe_grade); 210 211 default: 212 panic("mac_biba_dominate_element: b->mbe_type invalid"); 213 } 214 215 default: 216 panic("mac_biba_dominate_element: a->mbe_type invalid"); 217 } 218 219 return (0); 220} 221 222static int 223mac_biba_subject_dominate_high(struct mac_biba *mac_biba) 224{ 225 struct mac_biba_element *element; 226 227 KASSERT((mac_biba->mb_single->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 228 ("mac_biba_single_in_range: mac_biba not single")); 229 element = &mac_biba->mb_single; 230 231 return (element->mbe_type == MAC_BIBA_TYPE_EQUAL || 232 element->mbe_type == MAC_BIBA_TYPE_HIGH); 233} 234 235static int 236mac_biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb) 237{ 238 239 return (mac_biba_dominate_element(&rangeb->mb_rangehigh, 240 &rangea->mb_rangehigh) && 241 mac_biba_dominate_element(&rangea->mb_rangelow, 242 &rangeb->mb_rangelow)); 243} 244 245static int 246mac_biba_single_in_range(struct mac_biba *single, struct mac_biba *range) 247{ 248 249 KASSERT((single->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 250 ("mac_biba_single_in_range: a not single")); 251 KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 252 ("mac_biba_single_in_range: b not range")); 253 254 return (mac_biba_dominate_element(&range->mb_rangehigh, 255 &single->mb_single) && 256 mac_biba_dominate_element(&single->mb_single, 257 &range->mb_rangelow)); 258 259 return (1); 260} 261 262static int 263mac_biba_dominate_single(struct mac_biba *a, struct mac_biba *b) 264{ 265 KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 266 ("mac_biba_dominate_single: a not single")); 267 KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 268 ("mac_biba_dominate_single: b not single")); 269 270 return (mac_biba_dominate_element(&a->mb_single, &b->mb_single)); 271} 272 273static int 274mac_biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b) 275{ 276 277 if (a->mbe_type == MAC_BIBA_TYPE_EQUAL || 278 b->mbe_type == MAC_BIBA_TYPE_EQUAL) 279 return (1); 280 281 return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade); 282} 283 284static int 285mac_biba_equal_single(struct mac_biba *a, struct mac_biba *b) 286{ 287 288 KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 289 ("mac_biba_equal_single: a not single")); 290 KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 291 ("mac_biba_equal_single: b not single")); 292 293 return (mac_biba_equal_element(&a->mb_single, &b->mb_single)); 294} 295 296static int 297mac_biba_contains_equal(struct mac_biba *mac_biba) 298{ 299 300 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) 301 if (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_EQUAL) 302 return (1); 303 304 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 305 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL) 306 return (1); 307 if (mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 308 return (1); 309 } 310 311 return (0); 312} 313 314static int 315mac_biba_subject_equal_ok(struct mac_biba *mac_biba) 316{ 317 318 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAGS_BOTH) == 319 MAC_BIBA_FLAGS_BOTH, 320 ("mac_biba_subject_equal_ok: subject doesn't have both labels")); 321 322 /* If the single is EQUAL, it's ok. */ 323 if (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_EQUAL) 324 return (0); 325 326 /* If either range endpoint is EQUAL, it's ok. */ 327 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL || 328 mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 329 return (0); 330 331 /* If the range is low-high, it's ok. */ 332 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW && 333 mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH) 334 return (0); 335 336 /* It's not ok. */ 337 return (EPERM); 338} 339 340mac_biba_high_single(struct mac_biba *mac_biba) 341{ 342 343 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 344 ("mac_biba_equal_single: mac_biba not single")); 345 346 return (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_HIGH); 347} 348 349static int 350mac_biba_valid(struct mac_biba *mac_biba) 351{ 352 353 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { 354 switch (mac_biba->mb_single.mbe_type) { 355 case MAC_BIBA_TYPE_GRADE: 356 break; 357 358 case MAC_BIBA_TYPE_EQUAL: 359 case MAC_BIBA_TYPE_HIGH: 360 case MAC_BIBA_TYPE_LOW: 361 if (mac_biba->mb_single.mbe_grade != 0 || 362 !MAC_BIBA_BIT_SET_EMPTY( 363 mac_biba->mb_single.mbe_compartments)) 364 return (EINVAL); 365 break; 366 367 default: 368 return (EINVAL); 369 } 370 } else { 371 if (mac_biba->mb_single.mbe_type != MAC_BIBA_TYPE_UNDEF) 372 return (EINVAL); 373 } 374 375 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 376 switch (mac_biba->mb_rangelow.mbe_type) { 377 case MAC_BIBA_TYPE_GRADE: 378 break; 379 380 case MAC_BIBA_TYPE_EQUAL: 381 case MAC_BIBA_TYPE_HIGH: 382 case MAC_BIBA_TYPE_LOW: 383 if (mac_biba->mb_rangelow.mbe_grade != 0 || 384 !MAC_BIBA_BIT_SET_EMPTY( 385 mac_biba->mb_rangelow.mbe_compartments)) 386 return (EINVAL); 387 break; 388 389 default: 390 return (EINVAL); 391 } 392 393 switch (mac_biba->mb_rangehigh.mbe_type) { 394 case MAC_BIBA_TYPE_GRADE: 395 break; 396 397 case MAC_BIBA_TYPE_EQUAL: 398 case MAC_BIBA_TYPE_HIGH: 399 case MAC_BIBA_TYPE_LOW: 400 if (mac_biba->mb_rangehigh.mbe_grade != 0 || 401 !MAC_BIBA_BIT_SET_EMPTY( 402 mac_biba->mb_rangehigh.mbe_compartments)) 403 return (EINVAL); 404 break; 405 406 default: 407 return (EINVAL); 408 } 409 if (!mac_biba_dominate_element(&mac_biba->mb_rangehigh, 410 &mac_biba->mb_rangelow)) 411 return (EINVAL); 412 } else { 413 if (mac_biba->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF || 414 mac_biba->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF) 415 return (EINVAL); 416 } 417 418 return (0); 419} 420 421static void 422mac_biba_set_range(struct mac_biba *mac_biba, u_short typelow, 423 u_short gradelow, u_char *compartmentslow, u_short typehigh, 424 u_short gradehigh, u_char *compartmentshigh) 425{ 426 427 mac_biba->mb_rangelow.mbe_type = typelow; 428 mac_biba->mb_rangelow.mbe_grade = gradelow; 429 if (compartmentslow != NULL) 430 memcpy(mac_biba->mb_rangelow.mbe_compartments, 431 compartmentslow, 432 sizeof(mac_biba->mb_rangelow.mbe_compartments)); 433 mac_biba->mb_rangehigh.mbe_type = typehigh; 434 mac_biba->mb_rangehigh.mbe_grade = gradehigh; 435 if (compartmentshigh != NULL) 436 memcpy(mac_biba->mb_rangehigh.mbe_compartments, 437 compartmentshigh, 438 sizeof(mac_biba->mb_rangehigh.mbe_compartments)); 439 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 440} 441 442static void 443mac_biba_set_single(struct mac_biba *mac_biba, u_short type, u_short grade, 444 u_char *compartments) 445{ 446 447 mac_biba->mb_single.mbe_type = type; 448 mac_biba->mb_single.mbe_grade = grade; 449 if (compartments != NULL) 450 memcpy(mac_biba->mb_single.mbe_compartments, compartments, 451 sizeof(mac_biba->mb_single.mbe_compartments)); 452 mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; 453} 454 455static void 456mac_biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto) 457{ 458 459 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 460 ("mac_biba_copy_range: labelfrom not range")); 461 462 labelto->mb_rangelow = labelfrom->mb_rangelow; 463 labelto->mb_rangehigh = labelfrom->mb_rangehigh; 464 labelto->mb_flags |= MAC_BIBA_FLAG_RANGE; 465} 466 467static void 468mac_biba_copy_single(struct mac_biba *labelfrom, struct mac_biba *labelto) 469{ 470 471 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 472 ("mac_biba_copy_single: labelfrom not single")); 473 474 labelto->mb_single = labelfrom->mb_single; 475 labelto->mb_flags |= MAC_BIBA_FLAG_SINGLE; 476} 477 478static void 479mac_biba_copy(struct mac_biba *source, struct mac_biba *dest) 480{ 481 482 if (source->mb_flags & MAC_BIBA_FLAG_SINGLE) 483 mac_biba_copy_single(source, dest); 484 if (source->mb_flags & MAC_BIBA_FLAG_RANGE) 485 mac_biba_copy_range(source, dest); 486} 487 488/* 489 * Policy module operations. 490 */ 491static void 492mac_biba_destroy(struct mac_policy_conf *conf) 493{ 494 495} 496 497static void 498mac_biba_init(struct mac_policy_conf *conf) 499{ 500 501} 502 503/* 504 * Label operations. 505 */ 506static void 507mac_biba_init_label(struct label *label) 508{ 509 510 SLOT(label) = biba_alloc(M_WAITOK); 511} 512 513static int 514mac_biba_init_label_waitcheck(struct label *label, int flag) 515{ 516 517 SLOT(label) = biba_alloc(flag); 518 if (SLOT(label) == NULL) 519 return (ENOMEM); 520 521 return (0); 522} 523 524static void 525mac_biba_destroy_label(struct label *label) 526{ 527 528 biba_free(SLOT(label)); 529 SLOT(label) = NULL; 530} 531 532/* 533 * mac_biba_element_to_string() is basically an snprintf wrapper with 534 * the same properties as snprintf(). It returns the length it would 535 * have added to the string in the event the string is too short. 536 */ 537static size_t 538mac_biba_element_to_string(char *string, size_t size, 539 struct mac_biba_element *element) 540{ 541 int pos, bit = 1; 542 543 switch (element->mbe_type) { 544 case MAC_BIBA_TYPE_HIGH: 545 return (snprintf(string, size, "high")); 546 547 case MAC_BIBA_TYPE_LOW: 548 return (snprintf(string, size, "low")); 549 550 case MAC_BIBA_TYPE_EQUAL: 551 return (snprintf(string, size, "equal")); 552 553 case MAC_BIBA_TYPE_GRADE: 554 pos = snprintf(string, size, "%d:", element->mbe_grade); 555 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) { 556 if (MAC_BIBA_BIT_TEST(bit, element->mbe_compartments)) 557 pos += snprintf(string + pos, size - pos, 558 "%d+", bit); 559 } 560 if (string[pos - 1] == '+' || string[pos - 1] == ':') 561 string[--pos] = NULL; 562 return (pos); 563 564 default: 565 panic("mac_biba_element_to_string: invalid type (%d)", 566 element->mbe_type); 567 } 568} 569 570static int 571mac_biba_to_string(char *string, size_t size, size_t *caller_len, 572 struct mac_biba *mac_biba) 573{ 574 size_t left, len; 575 char *curptr; 576 577 bzero(string, size); 578 curptr = string; 579 left = size; 580 581 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { 582 len = mac_biba_element_to_string(curptr, left, 583 &mac_biba->mb_single); 584 if (len >= left) 585 return (EINVAL); 586 left -= len; 587 curptr += len; 588 } 589 590 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 591 len = snprintf(curptr, left, "("); 592 if (len >= left) 593 return (EINVAL); 594 left -= len; 595 curptr += len; 596 597 len = mac_biba_element_to_string(curptr, left, 598 &mac_biba->mb_rangelow); 599 if (len >= left) 600 return (EINVAL); 601 left -= len; 602 curptr += len; 603 604 len = snprintf(curptr, left, "-"); 605 if (len >= left) 606 return (EINVAL); 607 left -= len; 608 curptr += len; 609 610 len = mac_biba_element_to_string(curptr, left, 611 &mac_biba->mb_rangehigh); 612 if (len >= left) 613 return (EINVAL); 614 left -= len; 615 curptr += len; 616 617 len = snprintf(curptr, left, ")"); 618 if (len >= left) 619 return (EINVAL); 620 left -= len; 621 curptr += len; 622 } 623 624 *caller_len = strlen(string); 625 return (0); 626} 627 628static int 629mac_biba_externalize_label(struct label *label, char *element_name, 630 char *element_data, size_t size, size_t *len, int *claimed) 631{ 632 struct mac_biba *mac_biba; 633 int error; 634 635 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 636 return (0); 637 638 (*claimed)++; 639 640 mac_biba = SLOT(label); 641 error = mac_biba_to_string(element_data, size, len, mac_biba); 642 if (error) 643 return (error); 644 645 *len = strlen(element_data); 646 return (0); 647} 648 649static int 650mac_biba_parse_element(struct mac_biba_element *element, char *string) 651{ 652 653 if (strcmp(string, "high") == 0 || 654 strcmp(string, "hi") == 0) { 655 element->mbe_type = MAC_BIBA_TYPE_HIGH; 656 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 657 } else if (strcmp(string, "low") == 0 || 658 strcmp(string, "lo") == 0) { 659 element->mbe_type = MAC_BIBA_TYPE_LOW; 660 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 661 } else if (strcmp(string, "equal") == 0 || 662 strcmp(string, "eq") == 0) { 663 element->mbe_type = MAC_BIBA_TYPE_EQUAL; 664 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 665 } else { 666 char *p0, *p1; 667 int d; 668 669 p0 = string; 670 d = strtol(p0, &p1, 10); 671 672 if (d < 0 || d > 65535) 673 return (EINVAL); 674 element->mbe_type = MAC_BIBA_TYPE_GRADE; 675 element->mbe_grade = d; 676 677 if (*p1 != ':') { 678 if (p1 == p0 || *p1 != '\0') 679 return (EINVAL); 680 else 681 return (0); 682 } 683 else 684 if (*(p1 + 1) == '\0') 685 return (0); 686 687 while ((p0 = ++p1)) { 688 d = strtol(p0, &p1, 10); 689 if (d < 1 || d > MAC_BIBA_MAX_COMPARTMENTS) 690 return (EINVAL); 691 692 MAC_BIBA_BIT_SET(d, element->mbe_compartments); 693 694 if (*p1 == '\0') 695 break; 696 if (p1 == p0 || *p1 != '+') 697 return (EINVAL); 698 } 699 } 700 701 return (0); 702} 703 704/* 705 * Note: destructively consumes the string, make a local copy before 706 * calling if that's a problem. 707 */ 708static int 709mac_biba_parse(struct mac_biba *mac_biba, char *string) 710{ 711 char *range, *rangeend, *rangehigh, *rangelow, *single; 712 int error; 713 714 /* Do we have a range? */ 715 single = string; 716 range = index(string, '('); 717 if (range == single) 718 single = NULL; 719 rangelow = rangehigh = NULL; 720 if (range != NULL) { 721 /* Nul terminate the end of the single string. */ 722 *range = '\0'; 723 range++; 724 rangelow = range; 725 rangehigh = index(rangelow, '-'); 726 if (rangehigh == NULL) 727 return (EINVAL); 728 rangehigh++; 729 if (*rangelow == '\0' || *rangehigh == '\0') 730 return (EINVAL); 731 rangeend = index(rangehigh, ')'); 732 if (rangeend == NULL) 733 return (EINVAL); 734 if (*(rangeend + 1) != '\0') 735 return (EINVAL); 736 /* Nul terminate the ends of the ranges. */ 737 *(rangehigh - 1) = '\0'; 738 *rangeend = '\0'; 739 } 740 KASSERT((rangelow != NULL && rangehigh != NULL) || 741 (rangelow == NULL && rangehigh == NULL), 742 ("mac_biba_internalize_label: range mismatch")); 743 744 bzero(mac_biba, sizeof(*mac_biba)); 745 if (single != NULL) { 746 error = mac_biba_parse_element(&mac_biba->mb_single, single); 747 if (error) 748 return (error); 749 mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; 750 } 751 752 if (rangelow != NULL) { 753 error = mac_biba_parse_element(&mac_biba->mb_rangelow, 754 rangelow); 755 if (error) 756 return (error); 757 error = mac_biba_parse_element(&mac_biba->mb_rangehigh, 758 rangehigh); 759 if (error) 760 return (error); 761 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 762 } 763 764 error = mac_biba_valid(mac_biba); 765 if (error) 766 return (error); 767 768 return (0); 769} 770 771static int 772mac_biba_internalize_label(struct label *label, char *element_name, 773 char *element_data, int *claimed) 774{ 775 struct mac_biba *mac_biba, mac_biba_temp; 776 int error; 777 778 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 779 return (0); 780 781 (*claimed)++; 782 783 error = mac_biba_parse(&mac_biba_temp, element_data); 784 if (error) 785 return (error); 786 787 mac_biba = SLOT(label); 788 *mac_biba = mac_biba_temp; 789 790 return (0); 791} 792 793static void 794mac_biba_copy_label(struct label *src, struct label *dest) 795{ 796 797 *SLOT(dest) = *SLOT(src); 798} 799 800/* 801 * Labeling event operations: file system objects, and things that look 802 * a lot like file system objects. 803 */ 804static void 805mac_biba_create_devfs_device(dev_t dev, struct devfs_dirent *devfs_dirent, 806 struct label *label) 807{ 808 struct mac_biba *mac_biba; 809 int biba_type; 810 811 mac_biba = SLOT(label); 812 if (strcmp(dev->si_name, "null") == 0 || 813 strcmp(dev->si_name, "zero") == 0 || 814 strcmp(dev->si_name, "random") == 0 || 815 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 816 biba_type = MAC_BIBA_TYPE_EQUAL; 817 else if (ptys_equal && 818 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 819 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 820 biba_type = MAC_BIBA_TYPE_EQUAL; 821 else 822 biba_type = MAC_BIBA_TYPE_HIGH; 823 mac_biba_set_single(mac_biba, biba_type, 0, NULL); 824} 825 826static void 827mac_biba_create_devfs_directory(char *dirname, int dirnamelen, 828 struct devfs_dirent *devfs_dirent, struct label *label) 829{ 830 struct mac_biba *mac_biba; 831 832 mac_biba = SLOT(label); 833 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 834} 835 836static void 837mac_biba_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd, 838 struct label *ddlabel, struct devfs_dirent *de, struct label *delabel) 839{ 840 struct mac_biba *source, *dest; 841 842 source = SLOT(&cred->cr_label); 843 dest = SLOT(delabel); 844 845 mac_biba_copy_single(source, dest); 846} 847 848static void 849mac_biba_create_devfs_vnode(struct devfs_dirent *devfs_dirent, 850 struct label *direntlabel, struct vnode *vp, struct label *vnodelabel) 851{ 852 struct mac_biba *source, *dest; 853 854 source = SLOT(direntlabel); 855 dest = SLOT(vnodelabel); 856 mac_biba_copy_single(source, dest); 857} 858 859static void 860mac_biba_create_mount(struct ucred *cred, struct mount *mp, 861 struct label *mntlabel, struct label *fslabel) 862{ 863 struct mac_biba *source, *dest; 864 865 source = SLOT(&cred->cr_label); 866 dest = SLOT(mntlabel); 867 mac_biba_copy_single(source, dest); 868 dest = SLOT(fslabel); 869 mac_biba_copy_single(source, dest); 870} 871 872static void 873mac_biba_create_root_mount(struct ucred *cred, struct mount *mp, 874 struct label *mntlabel, struct label *fslabel) 875{ 876 struct mac_biba *mac_biba; 877 878 /* Always mount root as high integrity. */ 879 mac_biba = SLOT(fslabel); 880 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 881 mac_biba = SLOT(mntlabel); 882 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 883} 884 885static void 886mac_biba_relabel_vnode(struct ucred *cred, struct vnode *vp, 887 struct label *vnodelabel, struct label *label) 888{ 889 struct mac_biba *source, *dest; 890 891 source = SLOT(label); 892 dest = SLOT(vnodelabel); 893 894 mac_biba_copy(source, dest); 895} 896 897static void 898mac_biba_update_devfsdirent(struct devfs_dirent *devfs_dirent, 899 struct label *direntlabel, struct vnode *vp, struct label *vnodelabel) 900{ 901 struct mac_biba *source, *dest; 902 903 source = SLOT(vnodelabel); 904 dest = SLOT(direntlabel); 905 906 mac_biba_copy(source, dest); 907} 908 909static void 910mac_biba_associate_vnode_devfs(struct mount *mp, struct label *fslabel, 911 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 912 struct label *vlabel) 913{ 914 struct mac_biba *source, *dest; 915 916 source = SLOT(delabel); 917 dest = SLOT(vlabel); 918 919 mac_biba_copy_single(source, dest); 920} 921 922static int 923mac_biba_associate_vnode_extattr(struct mount *mp, struct label *fslabel, 924 struct vnode *vp, struct label *vlabel) 925{ 926 struct mac_biba temp, *source, *dest; 927 size_t buflen; 928 int error; 929 930 source = SLOT(fslabel); 931 dest = SLOT(vlabel); 932 933 buflen = sizeof(temp); 934 bzero(&temp, buflen); 935 936 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 937 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &temp, curthread); 938 if (error == ENOATTR || error == EOPNOTSUPP) { 939 /* Fall back to the fslabel. */ 940 mac_biba_copy_single(source, dest); 941 return (0); 942 } else if (error) 943 return (error); 944 945 if (buflen != sizeof(temp)) { 946 printf("mac_biba_associate_vnode_extattr: bad size %d\n", 947 buflen); 948 return (EPERM); 949 } 950 if (mac_biba_valid(&temp) != 0) { 951 printf("mac_biba_associate_vnode_extattr: invalid\n"); 952 return (EPERM); 953 } 954 if ((temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) { 955 printf("mac_biba_associate_vnode_extattr: not single\n"); 956 return (EPERM); 957 } 958 959 mac_biba_copy_single(&temp, dest); 960 return (0); 961} 962 963static void 964mac_biba_associate_vnode_singlelabel(struct mount *mp, 965 struct label *fslabel, struct vnode *vp, struct label *vlabel) 966{ 967 struct mac_biba *source, *dest; 968 969 source = SLOT(fslabel); 970 dest = SLOT(vlabel); 971 972 mac_biba_copy_single(source, dest); 973} 974 975static int 976mac_biba_create_vnode_extattr(struct ucred *cred, struct mount *mp, 977 struct label *fslabel, struct vnode *dvp, struct label *dlabel, 978 struct vnode *vp, struct label *vlabel, struct componentname *cnp) 979{ 980 struct mac_biba *source, *dest, temp; 981 size_t buflen; 982 int error; 983 984 buflen = sizeof(temp); 985 bzero(&temp, buflen); 986 987 source = SLOT(&cred->cr_label); 988 dest = SLOT(vlabel); 989 mac_biba_copy_single(source, &temp); 990 991 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 992 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 993 if (error == 0) 994 mac_biba_copy_single(source, dest); 995 return (error); 996} 997 998static int 999mac_biba_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 1000 struct label *vlabel, struct label *intlabel) 1001{ 1002 struct mac_biba *source, temp; 1003 size_t buflen; 1004 int error; 1005 1006 buflen = sizeof(temp); 1007 bzero(&temp, buflen); 1008 1009 source = SLOT(intlabel); 1010 if ((source->mb_flags & MAC_BIBA_FLAG_SINGLE) == 0) 1011 return (0); 1012 1013 mac_biba_copy_single(source, &temp); 1014 1015 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 1016 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 1017 return (error); 1018} 1019 1020/* 1021 * Labeling event operations: IPC object. 1022 */ 1023static void 1024mac_biba_create_mbuf_from_socket(struct socket *so, struct label *socketlabel, 1025 struct mbuf *m, struct label *mbuflabel) 1026{ 1027 struct mac_biba *source, *dest; 1028 1029 source = SLOT(socketlabel); 1030 dest = SLOT(mbuflabel); 1031 1032 mac_biba_copy_single(source, dest); 1033} 1034 1035static void 1036mac_biba_create_socket(struct ucred *cred, struct socket *socket, 1037 struct label *socketlabel) 1038{ 1039 struct mac_biba *source, *dest; 1040 1041 source = SLOT(&cred->cr_label); 1042 dest = SLOT(socketlabel); 1043 1044 mac_biba_copy_single(source, dest); 1045} 1046 1047static void 1048mac_biba_create_pipe(struct ucred *cred, struct pipe *pipe, 1049 struct label *pipelabel) 1050{ 1051 struct mac_biba *source, *dest; 1052 1053 source = SLOT(&cred->cr_label); 1054 dest = SLOT(pipelabel); 1055 1056 mac_biba_copy_single(source, dest); 1057} 1058 1059static void 1060mac_biba_create_socket_from_socket(struct socket *oldsocket, 1061 struct label *oldsocketlabel, struct socket *newsocket, 1062 struct label *newsocketlabel) 1063{ 1064 struct mac_biba *source, *dest; 1065 1066 source = SLOT(oldsocketlabel); 1067 dest = SLOT(newsocketlabel); 1068 1069 mac_biba_copy_single(source, dest); 1070} 1071 1072static void 1073mac_biba_relabel_socket(struct ucred *cred, struct socket *socket, 1074 struct label *socketlabel, struct label *newlabel) 1075{ 1076 struct mac_biba *source, *dest; 1077 1078 source = SLOT(newlabel); 1079 dest = SLOT(socketlabel); 1080 1081 mac_biba_copy(source, dest); 1082} 1083 1084static void 1085mac_biba_relabel_pipe(struct ucred *cred, struct pipe *pipe, 1086 struct label *pipelabel, struct label *newlabel) 1087{ 1088 struct mac_biba *source, *dest; 1089 1090 source = SLOT(newlabel); 1091 dest = SLOT(pipelabel); 1092 1093 mac_biba_copy(source, dest); 1094} 1095 1096static void 1097mac_biba_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel, 1098 struct socket *socket, struct label *socketpeerlabel) 1099{ 1100 struct mac_biba *source, *dest; 1101 1102 source = SLOT(mbuflabel); 1103 dest = SLOT(socketpeerlabel); 1104 1105 mac_biba_copy_single(source, dest); 1106} 1107 1108/* 1109 * Labeling event operations: network objects. 1110 */ 1111static void 1112mac_biba_set_socket_peer_from_socket(struct socket *oldsocket, 1113 struct label *oldsocketlabel, struct socket *newsocket, 1114 struct label *newsocketpeerlabel) 1115{ 1116 struct mac_biba *source, *dest; 1117 1118 source = SLOT(oldsocketlabel); 1119 dest = SLOT(newsocketpeerlabel); 1120 1121 mac_biba_copy_single(source, dest); 1122} 1123 1124static void 1125mac_biba_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d, 1126 struct label *bpflabel) 1127{ 1128 struct mac_biba *source, *dest; 1129 1130 source = SLOT(&cred->cr_label); 1131 dest = SLOT(bpflabel); 1132 1133 mac_biba_copy_single(source, dest); 1134} 1135 1136static void 1137mac_biba_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel) 1138{ 1139 char tifname[IFNAMSIZ], ifname[IFNAMSIZ], *p, *q; 1140 char tiflist[sizeof(trusted_interfaces)]; 1141 struct mac_biba *dest; 1142 int len, grade; 1143 1144 dest = SLOT(ifnetlabel); 1145 1146 if (ifnet->if_type == IFT_LOOP) { 1147 grade = MAC_BIBA_TYPE_EQUAL; 1148 goto set; 1149 } 1150 1151 if (trust_all_interfaces) { 1152 grade = MAC_BIBA_TYPE_HIGH; 1153 goto set; 1154 } 1155 1156 grade = MAC_BIBA_TYPE_LOW; 1157 1158 if (trusted_interfaces[0] == '\0' || 1159 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1160 goto set; 1161 1162 bzero(tiflist, sizeof(tiflist)); 1163 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1164 if(*p != ' ' && *p != '\t') 1165 *q = *p; 1166 1167 snprintf(ifname, IFNAMSIZ, "%s%d", ifnet->if_name, ifnet->if_unit); 1168 1169 for (p = q = tiflist;; p++) { 1170 if (*p == ',' || *p == '\0') { 1171 len = p - q; 1172 if (len < IFNAMSIZ) { 1173 bzero(tifname, sizeof(tifname)); 1174 bcopy(q, tifname, len); 1175 if (strcmp(tifname, ifname) == 0) { 1176 grade = MAC_BIBA_TYPE_HIGH; 1177 break; 1178 } 1179 } else { 1180 *p = '\0'; 1181 printf("mac_biba warning: interface name " 1182 "\"%s\" is too long (must be < %d)\n", 1183 q, IFNAMSIZ); 1184 } 1185 if (*p == '\0') 1186 break; 1187 q = p + 1; 1188 } 1189 } 1190set: 1191 mac_biba_set_single(dest, grade, 0, NULL); 1192 mac_biba_set_range(dest, grade, 0, NULL, grade, 0, NULL); 1193} 1194 1195static void 1196mac_biba_create_ipq(struct mbuf *fragment, struct label *fragmentlabel, 1197 struct ipq *ipq, struct label *ipqlabel) 1198{ 1199 struct mac_biba *source, *dest; 1200 1201 source = SLOT(fragmentlabel); 1202 dest = SLOT(ipqlabel); 1203 1204 mac_biba_copy_single(source, dest); 1205} 1206 1207static void 1208mac_biba_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel, 1209 struct mbuf *datagram, struct label *datagramlabel) 1210{ 1211 struct mac_biba *source, *dest; 1212 1213 source = SLOT(ipqlabel); 1214 dest = SLOT(datagramlabel); 1215 1216 /* Just use the head, since we require them all to match. */ 1217 mac_biba_copy_single(source, dest); 1218} 1219 1220static void 1221mac_biba_create_fragment(struct mbuf *datagram, struct label *datagramlabel, 1222 struct mbuf *fragment, struct label *fragmentlabel) 1223{ 1224 struct mac_biba *source, *dest; 1225 1226 source = SLOT(datagramlabel); 1227 dest = SLOT(fragmentlabel); 1228 1229 mac_biba_copy_single(source, dest); 1230} 1231 1232static void 1233mac_biba_create_mbuf_from_mbuf(struct mbuf *oldmbuf, 1234 struct label *oldmbuflabel, struct mbuf *newmbuf, 1235 struct label *newmbuflabel) 1236{ 1237 struct mac_biba *source, *dest; 1238 1239 source = SLOT(oldmbuflabel); 1240 dest = SLOT(newmbuflabel); 1241 1242 /* 1243 * Because the source mbuf may not yet have been "created", 1244 * just initialized, we do a conditional copy. Since we don't 1245 * allow mbufs to have ranges, do a KASSERT to make sure that 1246 * doesn't happen. 1247 */ 1248 KASSERT((source->mb_flags & MAC_BIBA_FLAG_RANGE) == 0, 1249 ("mac_biba_create_mbuf_from_mbuf: source mbuf has range")); 1250 mac_biba_copy(source, dest); 1251} 1252 1253static void 1254mac_biba_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel, 1255 struct mbuf *mbuf, struct label *mbuflabel) 1256{ 1257 struct mac_biba *dest; 1258 1259 dest = SLOT(mbuflabel); 1260 1261 mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1262} 1263 1264static void 1265mac_biba_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel, 1266 struct mbuf *mbuf, struct label *mbuflabel) 1267{ 1268 struct mac_biba *source, *dest; 1269 1270 source = SLOT(bpflabel); 1271 dest = SLOT(mbuflabel); 1272 1273 mac_biba_copy_single(source, dest); 1274} 1275 1276static void 1277mac_biba_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel, 1278 struct mbuf *m, struct label *mbuflabel) 1279{ 1280 struct mac_biba *source, *dest; 1281 1282 source = SLOT(ifnetlabel); 1283 dest = SLOT(mbuflabel); 1284 1285 mac_biba_copy_single(source, dest); 1286} 1287 1288static void 1289mac_biba_create_mbuf_multicast_encap(struct mbuf *oldmbuf, 1290 struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel, 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 void 1302mac_biba_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel, 1303 struct mbuf *newmbuf, struct label *newmbuflabel) 1304{ 1305 struct mac_biba *source, *dest; 1306 1307 source = SLOT(oldmbuflabel); 1308 dest = SLOT(newmbuflabel); 1309 1310 mac_biba_copy_single(source, dest); 1311} 1312 1313static int 1314mac_biba_fragment_match(struct mbuf *fragment, struct label *fragmentlabel, 1315 struct ipq *ipq, struct label *ipqlabel) 1316{ 1317 struct mac_biba *a, *b; 1318 1319 a = SLOT(ipqlabel); 1320 b = SLOT(fragmentlabel); 1321 1322 return (mac_biba_equal_single(a, b)); 1323} 1324 1325static void 1326mac_biba_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet, 1327 struct label *ifnetlabel, struct label *newlabel) 1328{ 1329 struct mac_biba *source, *dest; 1330 1331 source = SLOT(newlabel); 1332 dest = SLOT(ifnetlabel); 1333 1334 mac_biba_copy(source, dest); 1335} 1336 1337static void 1338mac_biba_update_ipq(struct mbuf *fragment, struct label *fragmentlabel, 1339 struct ipq *ipq, struct label *ipqlabel) 1340{ 1341 1342 /* NOOP: we only accept matching labels, so no need to update */ 1343} 1344 1345/* 1346 * Labeling event operations: processes. 1347 */ 1348static void 1349mac_biba_create_cred(struct ucred *cred_parent, struct ucred *cred_child) 1350{ 1351 struct mac_biba *source, *dest; 1352 1353 source = SLOT(&cred_parent->cr_label); 1354 dest = SLOT(&cred_child->cr_label); 1355 1356 mac_biba_copy_single(source, dest); 1357 mac_biba_copy_range(source, dest); 1358} 1359 1360static void 1361mac_biba_execve_transition(struct ucred *old, struct ucred *new, 1362 struct vnode *vp, struct mac *vnodelabel) 1363{ 1364 struct mac_biba *source, *dest; 1365 1366 source = SLOT(&old->cr_label); 1367 dest = SLOT(&new->cr_label); 1368 1369 mac_biba_copy_single(source, dest); 1370 mac_biba_copy_range(source, dest); 1371} 1372 1373static int 1374mac_biba_execve_will_transition(struct ucred *old, struct vnode *vp, 1375 struct mac *vnodelabel) 1376{ 1377 1378 return (0); 1379} 1380 1381static void 1382mac_biba_create_proc0(struct ucred *cred) 1383{ 1384 struct mac_biba *dest; 1385 1386 dest = SLOT(&cred->cr_label); 1387 1388 mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1389 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1390 MAC_BIBA_TYPE_HIGH, 0, NULL); 1391} 1392 1393static void 1394mac_biba_create_proc1(struct ucred *cred) 1395{ 1396 struct mac_biba *dest; 1397 1398 dest = SLOT(&cred->cr_label); 1399 1400 mac_biba_set_single(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1401 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1402 MAC_BIBA_TYPE_HIGH, 0, NULL); 1403} 1404 1405static void 1406mac_biba_relabel_cred(struct ucred *cred, struct label *newlabel) 1407{ 1408 struct mac_biba *source, *dest; 1409 1410 source = SLOT(newlabel); 1411 dest = SLOT(&cred->cr_label); 1412 1413 mac_biba_copy(source, dest); 1414} 1415 1416/* 1417 * Access control checks. 1418 */ 1419static int 1420mac_biba_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel, 1421 struct ifnet *ifnet, struct label *ifnetlabel) 1422{ 1423 struct mac_biba *a, *b; 1424 1425 if (!mac_biba_enabled) 1426 return (0); 1427 1428 a = SLOT(bpflabel); 1429 b = SLOT(ifnetlabel); 1430 1431 if (mac_biba_equal_single(a, b)) 1432 return (0); 1433 return (EACCES); 1434} 1435 1436static int 1437mac_biba_check_cred_relabel(struct ucred *cred, struct label *newlabel) 1438{ 1439 struct mac_biba *subj, *new; 1440 int error; 1441 1442 subj = SLOT(&cred->cr_label); 1443 new = SLOT(newlabel); 1444 1445 /* 1446 * If there is a Biba label update for the credential, it may 1447 * be an update of the single, range, or both. 1448 */ 1449 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1450 if (error) 1451 return (error); 1452 1453 /* 1454 * If the Biba label is to be changed, authorize as appropriate. 1455 */ 1456 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1457 /* 1458 * To change the Biba single label on a credential, the 1459 * new single label must be in the current range. 1460 */ 1461 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE && 1462 !mac_biba_single_in_range(new, subj)) 1463 return (EPERM); 1464 1465 /* 1466 * To change the Biba range on a credential, the new 1467 * range label must be in the current range. 1468 */ 1469 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1470 !mac_biba_range_in_range(new, subj)) 1471 return (EPERM); 1472 1473 /* 1474 * To have EQUAL in any component of the new credential 1475 * Biba label, the subject must already have EQUAL in 1476 * their label. 1477 */ 1478 if (mac_biba_contains_equal(new)) { 1479 error = mac_biba_subject_equal_ok(subj); 1480 if (error) 1481 return (error); 1482 } 1483 1484 /* 1485 * XXXMAC: Additional consistency tests regarding the 1486 * single and range of the new label might be performed 1487 * here. 1488 */ 1489 } 1490 1491 return (0); 1492} 1493 1494static int 1495mac_biba_check_cred_visible(struct ucred *u1, struct ucred *u2) 1496{ 1497 struct mac_biba *subj, *obj; 1498 1499 if (!mac_biba_enabled) 1500 return (0); 1501 1502 subj = SLOT(&u1->cr_label); 1503 obj = SLOT(&u2->cr_label); 1504 1505 /* XXX: range */ 1506 if (!mac_biba_dominate_single(obj, subj)) 1507 return (ESRCH); 1508 1509 return (0); 1510} 1511 1512static int 1513mac_biba_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet, 1514 struct label *ifnetlabel, struct label *newlabel) 1515{ 1516 struct mac_biba *subj, *new; 1517 int error; 1518 1519 subj = SLOT(&cred->cr_label); 1520 new = SLOT(newlabel); 1521 1522 /* 1523 * If there is a Biba label update for the interface, it may 1524 * be an update of the single, range, or both. 1525 */ 1526 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1527 if (error) 1528 return (error); 1529 1530 /* 1531 * If the Biba label is to be changed, authorize as appropriate. 1532 */ 1533 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1534 /* 1535 * Rely on the traditional superuser status for the Biba 1536 * interface relabel requirements. XXXMAC: This will go 1537 * away. 1538 */ 1539 error = suser_cred(cred, 0); 1540 if (error) 1541 return (EPERM); 1542 1543 /* 1544 * XXXMAC: Additional consistency tests regarding the single 1545 * and the range of the new label might be performed here. 1546 */ 1547 } 1548 1549 return (0); 1550} 1551 1552static int 1553mac_biba_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel, 1554 struct mbuf *m, struct label *mbuflabel) 1555{ 1556 struct mac_biba *p, *i; 1557 1558 if (!mac_biba_enabled) 1559 return (0); 1560 1561 p = SLOT(mbuflabel); 1562 i = SLOT(ifnetlabel); 1563 1564 return (mac_biba_single_in_range(p, i) ? 0 : EACCES); 1565} 1566 1567static int 1568mac_biba_check_mount_stat(struct ucred *cred, struct mount *mp, 1569 struct label *mntlabel) 1570{ 1571 struct mac_biba *subj, *obj; 1572 1573 if (!mac_biba_enabled) 1574 return (0); 1575 1576 subj = SLOT(&cred->cr_label); 1577 obj = SLOT(mntlabel); 1578 1579 if (!mac_biba_dominate_single(obj, subj)) 1580 return (EACCES); 1581 1582 return (0); 1583} 1584 1585static int 1586mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, 1587 struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data) 1588{ 1589 1590 if(!mac_biba_enabled) 1591 return (0); 1592 1593 /* XXX: This will be implemented soon... */ 1594 1595 return (0); 1596} 1597 1598static int 1599mac_biba_check_pipe_poll(struct ucred *cred, struct pipe *pipe, 1600 struct label *pipelabel) 1601{ 1602 struct mac_biba *subj, *obj; 1603 1604 if (!mac_biba_enabled) 1605 return (0); 1606 1607 subj = SLOT(&cred->cr_label); 1608 obj = SLOT((pipelabel)); 1609 1610 if (!mac_biba_dominate_single(obj, subj)) 1611 return (EACCES); 1612 1613 return (0); 1614} 1615 1616static int 1617mac_biba_check_pipe_read(struct ucred *cred, struct pipe *pipe, 1618 struct label *pipelabel) 1619{ 1620 struct mac_biba *subj, *obj; 1621 1622 if (!mac_biba_enabled) 1623 return (0); 1624 1625 subj = SLOT(&cred->cr_label); 1626 obj = SLOT((pipelabel)); 1627 1628 if (!mac_biba_dominate_single(obj, subj)) 1629 return (EACCES); 1630 1631 return (0); 1632} 1633 1634static int 1635mac_biba_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 1636 struct label *pipelabel, struct label *newlabel) 1637{ 1638 struct mac_biba *subj, *obj, *new; 1639 int error; 1640 1641 new = SLOT(newlabel); 1642 subj = SLOT(&cred->cr_label); 1643 obj = SLOT(pipelabel); 1644 1645 /* 1646 * If there is a Biba label update for a pipe, it must be a 1647 * single update. 1648 */ 1649 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 1650 if (error) 1651 return (error); 1652 1653 /* 1654 * To perform a relabel of a pipe (Biba label or not), Biba must 1655 * authorize the relabel. 1656 */ 1657 if (!mac_biba_single_in_range(obj, subj)) 1658 return (EPERM); 1659 1660 /* 1661 * If the Biba label is to be changed, authorize as appropriate. 1662 */ 1663 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 1664 /* 1665 * To change the Biba label on a pipe, the new pipe label 1666 * must be in the subject range. 1667 */ 1668 if (!mac_biba_single_in_range(new, subj)) 1669 return (EPERM); 1670 1671 /* 1672 * To change the Biba label on a pipe to be EQUAL, the 1673 * subject must have appropriate privilege. 1674 */ 1675 if (mac_biba_contains_equal(new)) { 1676 error = mac_biba_subject_equal_ok(subj); 1677 if (error) 1678 return (error); 1679 } 1680 } 1681 1682 return (0); 1683} 1684 1685static int 1686mac_biba_check_pipe_stat(struct ucred *cred, struct pipe *pipe, 1687 struct label *pipelabel) 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((pipelabel)); 1696 1697 if (!mac_biba_dominate_single(obj, subj)) 1698 return (EACCES); 1699 1700 return (0); 1701} 1702 1703static int 1704mac_biba_check_pipe_write(struct ucred *cred, struct pipe *pipe, 1705 struct label *pipelabel) 1706{ 1707 struct mac_biba *subj, *obj; 1708 1709 if (!mac_biba_enabled) 1710 return (0); 1711 1712 subj = SLOT(&cred->cr_label); 1713 obj = SLOT((pipelabel)); 1714 1715 if (!mac_biba_dominate_single(subj, obj)) 1716 return (EACCES); 1717 1718 return (0); 1719} 1720 1721static int 1722mac_biba_check_proc_debug(struct ucred *cred, struct proc *proc) 1723{ 1724 struct mac_biba *subj, *obj; 1725 1726 if (!mac_biba_enabled) 1727 return (0); 1728 1729 subj = SLOT(&cred->cr_label); 1730 obj = SLOT(&proc->p_ucred->cr_label); 1731 1732 /* XXX: range checks */ 1733 if (!mac_biba_dominate_single(obj, subj)) 1734 return (ESRCH); 1735 if (!mac_biba_dominate_single(subj, obj)) 1736 return (EACCES); 1737 1738 return (0); 1739} 1740 1741static int 1742mac_biba_check_proc_sched(struct ucred *cred, struct proc *proc) 1743{ 1744 struct mac_biba *subj, *obj; 1745 1746 if (!mac_biba_enabled) 1747 return (0); 1748 1749 subj = SLOT(&cred->cr_label); 1750 obj = SLOT(&proc->p_ucred->cr_label); 1751 1752 /* XXX: range checks */ 1753 if (!mac_biba_dominate_single(obj, subj)) 1754 return (ESRCH); 1755 if (!mac_biba_dominate_single(subj, obj)) 1756 return (EACCES); 1757 1758 return (0); 1759} 1760 1761static int 1762mac_biba_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 1763{ 1764 struct mac_biba *subj, *obj; 1765 1766 if (!mac_biba_enabled) 1767 return (0); 1768 1769 subj = SLOT(&cred->cr_label); 1770 obj = SLOT(&proc->p_ucred->cr_label); 1771 1772 /* XXX: range checks */ 1773 if (!mac_biba_dominate_single(obj, subj)) 1774 return (ESRCH); 1775 if (!mac_biba_dominate_single(subj, obj)) 1776 return (EACCES); 1777 1778 return (0); 1779} 1780 1781static int 1782mac_biba_check_socket_deliver(struct socket *so, struct label *socketlabel, 1783 struct mbuf *m, struct label *mbuflabel) 1784{ 1785 struct mac_biba *p, *s; 1786 1787 if (!mac_biba_enabled) 1788 return (0); 1789 1790 p = SLOT(mbuflabel); 1791 s = SLOT(socketlabel); 1792 1793 return (mac_biba_equal_single(p, s) ? 0 : EACCES); 1794} 1795 1796static int 1797mac_biba_check_socket_relabel(struct ucred *cred, struct socket *socket, 1798 struct label *socketlabel, struct label *newlabel) 1799{ 1800 struct mac_biba *subj, *obj, *new; 1801 int error; 1802 1803 new = SLOT(newlabel); 1804 subj = SLOT(&cred->cr_label); 1805 obj = SLOT(socketlabel); 1806 1807 /* 1808 * If there is a Biba label update for the socket, it may be 1809 * an update of single. 1810 */ 1811 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 1812 if (error) 1813 return (error); 1814 1815 /* 1816 * To relabel a socket, the old socket single must be in the subject 1817 * range. 1818 */ 1819 if (!mac_biba_single_in_range(obj, subj)) 1820 return (EPERM); 1821 1822 /* 1823 * If the Biba label is to be changed, authorize as appropriate. 1824 */ 1825 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 1826 /* 1827 * To relabel a socket, the new socket single must be in 1828 * the subject range. 1829 */ 1830 if (!mac_biba_single_in_range(new, subj)) 1831 return (EPERM); 1832 1833 /* 1834 * To change the Biba label on the socket to contain EQUAL, 1835 * the subject must have appropriate privilege. 1836 */ 1837 if (mac_biba_contains_equal(new)) { 1838 error = mac_biba_subject_equal_ok(subj); 1839 if (error) 1840 return (error); 1841 } 1842 } 1843 1844 return (0); 1845} 1846 1847static int 1848mac_biba_check_socket_visible(struct ucred *cred, struct socket *socket, 1849 struct label *socketlabel) 1850{ 1851 struct mac_biba *subj, *obj; 1852 1853 if (!mac_biba_enabled) 1854 return (0); 1855 1856 subj = SLOT(&cred->cr_label); 1857 obj = SLOT(socketlabel); 1858 1859 if (!mac_biba_dominate_single(obj, subj)) 1860 return (ENOENT); 1861 1862 return (0); 1863} 1864 1865static int 1866mac_biba_check_vnode_chdir(struct ucred *cred, struct vnode *dvp, 1867 struct label *dlabel) 1868{ 1869 struct mac_biba *subj, *obj; 1870 1871 if (!mac_biba_enabled) 1872 return (0); 1873 1874 subj = SLOT(&cred->cr_label); 1875 obj = SLOT(dlabel); 1876 1877 if (!mac_biba_dominate_single(obj, subj)) 1878 return (EACCES); 1879 1880 return (0); 1881} 1882 1883static int 1884mac_biba_check_vnode_chroot(struct ucred *cred, struct vnode *dvp, 1885 struct label *dlabel) 1886{ 1887 struct mac_biba *subj, *obj; 1888 1889 if (!mac_biba_enabled) 1890 return (0); 1891 1892 subj = SLOT(&cred->cr_label); 1893 obj = SLOT(dlabel); 1894 1895 if (!mac_biba_dominate_single(obj, subj)) 1896 return (EACCES); 1897 1898 return (0); 1899} 1900 1901static int 1902mac_biba_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1903 struct label *dlabel, struct componentname *cnp, struct vattr *vap) 1904{ 1905 struct mac_biba *subj, *obj; 1906 1907 if (!mac_biba_enabled) 1908 return (0); 1909 1910 subj = SLOT(&cred->cr_label); 1911 obj = SLOT(dlabel); 1912 1913 if (!mac_biba_dominate_single(subj, obj)) 1914 return (EACCES); 1915 1916 return (0); 1917} 1918 1919static int 1920mac_biba_check_vnode_delete(struct ucred *cred, struct vnode *dvp, 1921 struct label *dlabel, struct vnode *vp, struct label *label, 1922 struct componentname *cnp) 1923{ 1924 struct mac_biba *subj, *obj; 1925 1926 if (!mac_biba_enabled) 1927 return (0); 1928 1929 subj = SLOT(&cred->cr_label); 1930 obj = SLOT(dlabel); 1931 1932 if (!mac_biba_dominate_single(subj, obj)) 1933 return (EACCES); 1934 1935 obj = SLOT(label); 1936 1937 if (!mac_biba_dominate_single(subj, obj)) 1938 return (EACCES); 1939 1940 return (0); 1941} 1942 1943static int 1944mac_biba_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1945 struct label *label, acl_type_t type) 1946{ 1947 struct mac_biba *subj, *obj; 1948 1949 if (!mac_biba_enabled) 1950 return (0); 1951 1952 subj = SLOT(&cred->cr_label); 1953 obj = SLOT(label); 1954 1955 if (!mac_biba_dominate_single(subj, obj)) 1956 return (EACCES); 1957 1958 return (0); 1959} 1960 1961static int 1962mac_biba_check_vnode_exec(struct ucred *cred, struct vnode *vp, 1963 struct label *label) 1964{ 1965 struct mac_biba *subj, *obj; 1966 1967 if (!mac_biba_enabled) 1968 return (0); 1969 1970 subj = SLOT(&cred->cr_label); 1971 obj = SLOT(label); 1972 1973 if (!mac_biba_dominate_single(obj, subj)) 1974 return (EACCES); 1975 1976 return (0); 1977} 1978 1979static int 1980mac_biba_check_vnode_getacl(struct ucred *cred, struct vnode *vp, 1981 struct label *label, acl_type_t type) 1982{ 1983 struct mac_biba *subj, *obj; 1984 1985 if (!mac_biba_enabled) 1986 return (0); 1987 1988 subj = SLOT(&cred->cr_label); 1989 obj = SLOT(label); 1990 1991 if (!mac_biba_dominate_single(obj, subj)) 1992 return (EACCES); 1993 1994 return (0); 1995} 1996 1997static int 1998mac_biba_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 1999 struct label *label, int attrnamespace, const char *name, struct uio *uio) 2000{ 2001 struct mac_biba *subj, *obj; 2002 2003 if (!mac_biba_enabled) 2004 return (0); 2005 2006 subj = SLOT(&cred->cr_label); 2007 obj = SLOT(label); 2008 2009 if (!mac_biba_dominate_single(obj, subj)) 2010 return (EACCES); 2011 2012 return (0); 2013} 2014 2015static int 2016mac_biba_check_vnode_link(struct ucred *cred, struct vnode *dvp, 2017 struct label *dlabel, struct vnode *vp, struct label *label, 2018 struct componentname *cnp) 2019{ 2020 struct mac_biba *subj, *obj; 2021 2022 if (!mac_biba_enabled) 2023 return (0); 2024 2025 subj = SLOT(&cred->cr_label); 2026 obj = SLOT(dlabel); 2027 2028 if (!mac_biba_dominate_single(subj, obj)) 2029 return (EACCES); 2030 2031 obj = SLOT(label); 2032 2033 if (!mac_biba_dominate_single(subj, obj)) 2034 return (EACCES); 2035 2036 return (0); 2037} 2038 2039static int 2040mac_biba_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 2041 struct label *dlabel, struct componentname *cnp) 2042{ 2043 struct mac_biba *subj, *obj; 2044 2045 if (!mac_biba_enabled) 2046 return (0); 2047 2048 subj = SLOT(&cred->cr_label); 2049 obj = SLOT(dlabel); 2050 2051 if (!mac_biba_dominate_single(obj, subj)) 2052 return (EACCES); 2053 2054 return (0); 2055} 2056 2057static int 2058mac_biba_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 2059 struct label *label, int prot) 2060{ 2061 struct mac_biba *subj, *obj; 2062 2063 /* 2064 * Rely on the use of open()-time protections to handle 2065 * non-revocation cases. 2066 */ 2067 if (!mac_biba_enabled || !revocation_enabled) 2068 return (0); 2069 2070 subj = SLOT(&cred->cr_label); 2071 obj = SLOT(label); 2072 2073 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2074 if (!mac_biba_dominate_single(obj, subj)) 2075 return (EACCES); 2076 } 2077 if (prot & VM_PROT_WRITE) { 2078 if (!mac_biba_dominate_single(subj, obj)) 2079 return (EACCES); 2080 } 2081 2082 return (0); 2083} 2084 2085static int 2086mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp, 2087 struct label *vnodelabel, mode_t acc_mode) 2088{ 2089 struct mac_biba *subj, *obj; 2090 2091 if (!mac_biba_enabled) 2092 return (0); 2093 2094 subj = SLOT(&cred->cr_label); 2095 obj = SLOT(vnodelabel); 2096 2097 /* XXX privilege override for admin? */ 2098 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2099 if (!mac_biba_dominate_single(obj, subj)) 2100 return (EACCES); 2101 } 2102 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2103 if (!mac_biba_dominate_single(subj, obj)) 2104 return (EACCES); 2105 } 2106 2107 return (0); 2108} 2109 2110static int 2111mac_biba_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 2112 struct vnode *vp, struct label *label) 2113{ 2114 struct mac_biba *subj, *obj; 2115 2116 if (!mac_biba_enabled || !revocation_enabled) 2117 return (0); 2118 2119 subj = SLOT(&active_cred->cr_label); 2120 obj = SLOT(label); 2121 2122 if (!mac_biba_dominate_single(obj, subj)) 2123 return (EACCES); 2124 2125 return (0); 2126} 2127 2128static int 2129mac_biba_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 2130 struct vnode *vp, struct label *label) 2131{ 2132 struct mac_biba *subj, *obj; 2133 2134 if (!mac_biba_enabled || !revocation_enabled) 2135 return (0); 2136 2137 subj = SLOT(&active_cred->cr_label); 2138 obj = SLOT(label); 2139 2140 if (!mac_biba_dominate_single(obj, subj)) 2141 return (EACCES); 2142 2143 return (0); 2144} 2145 2146static int 2147mac_biba_check_vnode_readdir(struct ucred *cred, struct vnode *dvp, 2148 struct label *dlabel) 2149{ 2150 struct mac_biba *subj, *obj; 2151 2152 if (!mac_biba_enabled) 2153 return (0); 2154 2155 subj = SLOT(&cred->cr_label); 2156 obj = SLOT(dlabel); 2157 2158 if (!mac_biba_dominate_single(obj, subj)) 2159 return (EACCES); 2160 2161 return (0); 2162} 2163 2164static int 2165mac_biba_check_vnode_readlink(struct ucred *cred, struct vnode *vp, 2166 struct label *label) 2167{ 2168 struct mac_biba *subj, *obj; 2169 2170 if (!mac_biba_enabled) 2171 return (0); 2172 2173 subj = SLOT(&cred->cr_label); 2174 obj = SLOT(label); 2175 2176 if (!mac_biba_dominate_single(obj, subj)) 2177 return (EACCES); 2178 2179 return (0); 2180} 2181 2182static int 2183mac_biba_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 2184 struct label *vnodelabel, struct label *newlabel) 2185{ 2186 struct mac_biba *old, *new, *subj; 2187 int error; 2188 2189 old = SLOT(vnodelabel); 2190 new = SLOT(newlabel); 2191 subj = SLOT(&cred->cr_label); 2192 2193 /* 2194 * If there is a Biba label update for the vnode, it must be a 2195 * single label. 2196 */ 2197 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 2198 if (error) 2199 return (error); 2200 2201 /* 2202 * To perform a relabel of the vnode (Biba label or not), Biba must 2203 * authorize the relabel. 2204 */ 2205 if (!mac_biba_single_in_range(old, subj)) 2206 return (EPERM); 2207 2208 /* 2209 * If the Biba label is to be changed, authorize as appropriate. 2210 */ 2211 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 2212 /* 2213 * To change the Biba label on a vnode, the new vnode label 2214 * must be in the subject range. 2215 */ 2216 if (!mac_biba_single_in_range(new, subj)) 2217 return (EPERM); 2218 2219 /* 2220 * To change the Biba label on the vnode to be EQUAL, 2221 * the subject must have appropriate privilege. 2222 */ 2223 if (mac_biba_contains_equal(new)) { 2224 error = mac_biba_subject_equal_ok(subj); 2225 if (error) 2226 return (error); 2227 } 2228 } 2229 2230 return (0); 2231} 2232 2233static int 2234mac_biba_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 2235 struct label *dlabel, struct vnode *vp, struct label *label, 2236 struct componentname *cnp) 2237{ 2238 struct mac_biba *subj, *obj; 2239 2240 if (!mac_biba_enabled) 2241 return (0); 2242 2243 subj = SLOT(&cred->cr_label); 2244 obj = SLOT(dlabel); 2245 2246 if (!mac_biba_dominate_single(subj, obj)) 2247 return (EACCES); 2248 2249 obj = SLOT(label); 2250 2251 if (!mac_biba_dominate_single(subj, obj)) 2252 return (EACCES); 2253 2254 return (0); 2255} 2256 2257static int 2258mac_biba_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 2259 struct label *dlabel, struct vnode *vp, struct label *label, int samedir, 2260 struct componentname *cnp) 2261{ 2262 struct mac_biba *subj, *obj; 2263 2264 if (!mac_biba_enabled) 2265 return (0); 2266 2267 subj = SLOT(&cred->cr_label); 2268 obj = SLOT(dlabel); 2269 2270 if (!mac_biba_dominate_single(subj, obj)) 2271 return (EACCES); 2272 2273 if (vp != NULL) { 2274 obj = SLOT(label); 2275 2276 if (!mac_biba_dominate_single(subj, obj)) 2277 return (EACCES); 2278 } 2279 2280 return (0); 2281} 2282 2283static int 2284mac_biba_check_vnode_revoke(struct ucred *cred, struct vnode *vp, 2285 struct label *label) 2286{ 2287 struct mac_biba *subj, *obj; 2288 2289 if (!mac_biba_enabled) 2290 return (0); 2291 2292 subj = SLOT(&cred->cr_label); 2293 obj = SLOT(label); 2294 2295 if (!mac_biba_dominate_single(subj, obj)) 2296 return (EACCES); 2297 2298 return (0); 2299} 2300 2301static int 2302mac_biba_check_vnode_setacl(struct ucred *cred, struct vnode *vp, 2303 struct label *label, acl_type_t type, struct acl *acl) 2304{ 2305 struct mac_biba *subj, *obj; 2306 2307 if (!mac_biba_enabled) 2308 return (0); 2309 2310 subj = SLOT(&cred->cr_label); 2311 obj = SLOT(label); 2312 2313 if (!mac_biba_dominate_single(subj, obj)) 2314 return (EACCES); 2315 2316 return (0); 2317} 2318 2319static int 2320mac_biba_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 2321 struct label *vnodelabel, int attrnamespace, const char *name, 2322 struct uio *uio) 2323{ 2324 struct mac_biba *subj, *obj; 2325 2326 if (!mac_biba_enabled) 2327 return (0); 2328 2329 subj = SLOT(&cred->cr_label); 2330 obj = SLOT(vnodelabel); 2331 2332 if (!mac_biba_dominate_single(subj, obj)) 2333 return (EACCES); 2334 2335 /* XXX: protect the MAC EA in a special way? */ 2336 2337 return (0); 2338} 2339 2340static int 2341mac_biba_check_vnode_setflags(struct ucred *cred, struct vnode *vp, 2342 struct label *vnodelabel, u_long flags) 2343{ 2344 struct mac_biba *subj, *obj; 2345 2346 if (!mac_biba_enabled) 2347 return (0); 2348 2349 subj = SLOT(&cred->cr_label); 2350 obj = SLOT(vnodelabel); 2351 2352 if (!mac_biba_dominate_single(subj, obj)) 2353 return (EACCES); 2354 2355 return (0); 2356} 2357 2358static int 2359mac_biba_check_vnode_setmode(struct ucred *cred, struct vnode *vp, 2360 struct label *vnodelabel, mode_t mode) 2361{ 2362 struct mac_biba *subj, *obj; 2363 2364 if (!mac_biba_enabled) 2365 return (0); 2366 2367 subj = SLOT(&cred->cr_label); 2368 obj = SLOT(vnodelabel); 2369 2370 if (!mac_biba_dominate_single(subj, obj)) 2371 return (EACCES); 2372 2373 return (0); 2374} 2375 2376static int 2377mac_biba_check_vnode_setowner(struct ucred *cred, struct vnode *vp, 2378 struct label *vnodelabel, uid_t uid, gid_t gid) 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(vnodelabel); 2387 2388 if (!mac_biba_dominate_single(subj, obj)) 2389 return (EACCES); 2390 2391 return (0); 2392} 2393 2394static int 2395mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 2396 struct label *vnodelabel, struct timespec atime, struct timespec mtime) 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(vnodelabel); 2405 2406 if (!mac_biba_dominate_single(subj, obj)) 2407 return (EACCES); 2408 2409 return (0); 2410} 2411 2412static int 2413mac_biba_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2414 struct vnode *vp, struct label *vnodelabel) 2415{ 2416 struct mac_biba *subj, *obj; 2417 2418 if (!mac_biba_enabled) 2419 return (0); 2420 2421 subj = SLOT(&active_cred->cr_label); 2422 obj = SLOT(vnodelabel); 2423 2424 if (!mac_biba_dominate_single(obj, subj)) 2425 return (EACCES); 2426 2427 return (0); 2428} 2429 2430static int 2431mac_biba_check_vnode_write(struct ucred *active_cred, 2432 struct ucred *file_cred, struct vnode *vp, struct label *label) 2433{ 2434 struct mac_biba *subj, *obj; 2435 2436 if (!mac_biba_enabled || !revocation_enabled) 2437 return (0); 2438 2439 subj = SLOT(&active_cred->cr_label); 2440 obj = SLOT(label); 2441 2442 if (!mac_biba_dominate_single(subj, obj)) 2443 return (EACCES); 2444 2445 return (0); 2446} 2447 2448static struct mac_policy_op_entry mac_biba_ops[] = 2449{ 2450 { MAC_DESTROY, 2451 (macop_t)mac_biba_destroy }, 2452 { MAC_INIT, 2453 (macop_t)mac_biba_init }, 2454 { MAC_INIT_BPFDESC_LABEL, 2455 (macop_t)mac_biba_init_label }, 2456 { MAC_INIT_CRED_LABEL, 2457 (macop_t)mac_biba_init_label }, 2458 { MAC_INIT_DEVFSDIRENT_LABEL, 2459 (macop_t)mac_biba_init_label }, 2460 { MAC_INIT_IFNET_LABEL, 2461 (macop_t)mac_biba_init_label }, 2462 { MAC_INIT_IPQ_LABEL, 2463 (macop_t)mac_biba_init_label }, 2464 { MAC_INIT_MBUF_LABEL, 2465 (macop_t)mac_biba_init_label_waitcheck }, 2466 { MAC_INIT_MOUNT_LABEL, 2467 (macop_t)mac_biba_init_label }, 2468 { MAC_INIT_MOUNT_FS_LABEL, 2469 (macop_t)mac_biba_init_label }, 2470 { MAC_INIT_PIPE_LABEL, 2471 (macop_t)mac_biba_init_label }, 2472 { MAC_INIT_SOCKET_LABEL, 2473 (macop_t)mac_biba_init_label_waitcheck }, 2474 { MAC_INIT_SOCKET_PEER_LABEL, 2475 (macop_t)mac_biba_init_label_waitcheck }, 2476 { MAC_INIT_VNODE_LABEL, 2477 (macop_t)mac_biba_init_label }, 2478 { MAC_DESTROY_BPFDESC_LABEL, 2479 (macop_t)mac_biba_destroy_label }, 2480 { MAC_DESTROY_CRED_LABEL, 2481 (macop_t)mac_biba_destroy_label }, 2482 { MAC_DESTROY_DEVFSDIRENT_LABEL, 2483 (macop_t)mac_biba_destroy_label }, 2484 { MAC_DESTROY_IFNET_LABEL, 2485 (macop_t)mac_biba_destroy_label }, 2486 { MAC_DESTROY_IPQ_LABEL, 2487 (macop_t)mac_biba_destroy_label }, 2488 { MAC_DESTROY_MBUF_LABEL, 2489 (macop_t)mac_biba_destroy_label }, 2490 { MAC_DESTROY_MOUNT_LABEL, 2491 (macop_t)mac_biba_destroy_label }, 2492 { MAC_DESTROY_MOUNT_FS_LABEL, 2493 (macop_t)mac_biba_destroy_label }, 2494 { MAC_DESTROY_PIPE_LABEL, 2495 (macop_t)mac_biba_destroy_label }, 2496 { MAC_DESTROY_SOCKET_LABEL, 2497 (macop_t)mac_biba_destroy_label }, 2498 { MAC_DESTROY_SOCKET_PEER_LABEL, 2499 (macop_t)mac_biba_destroy_label }, 2500 { MAC_DESTROY_VNODE_LABEL, 2501 (macop_t)mac_biba_destroy_label }, 2502 { MAC_COPY_PIPE_LABEL, 2503 (macop_t)mac_biba_copy_label }, 2504 { MAC_COPY_VNODE_LABEL, 2505 (macop_t)mac_biba_copy_label }, 2506 { MAC_EXTERNALIZE_CRED_LABEL, 2507 (macop_t)mac_biba_externalize_label }, 2508 { MAC_EXTERNALIZE_IFNET_LABEL, 2509 (macop_t)mac_biba_externalize_label }, 2510 { MAC_EXTERNALIZE_PIPE_LABEL, 2511 (macop_t)mac_biba_externalize_label }, 2512 { MAC_EXTERNALIZE_SOCKET_LABEL, 2513 (macop_t)mac_biba_externalize_label }, 2514 { MAC_EXTERNALIZE_SOCKET_PEER_LABEL, 2515 (macop_t)mac_biba_externalize_label }, 2516 { MAC_EXTERNALIZE_VNODE_LABEL, 2517 (macop_t)mac_biba_externalize_label }, 2518 { MAC_INTERNALIZE_CRED_LABEL, 2519 (macop_t)mac_biba_internalize_label }, 2520 { MAC_INTERNALIZE_IFNET_LABEL, 2521 (macop_t)mac_biba_internalize_label }, 2522 { MAC_INTERNALIZE_PIPE_LABEL, 2523 (macop_t)mac_biba_internalize_label }, 2524 { MAC_INTERNALIZE_SOCKET_LABEL, 2525 (macop_t)mac_biba_internalize_label }, 2526 { MAC_INTERNALIZE_VNODE_LABEL, 2527 (macop_t)mac_biba_internalize_label }, 2528 { MAC_CREATE_DEVFS_DEVICE, 2529 (macop_t)mac_biba_create_devfs_device }, 2530 { MAC_CREATE_DEVFS_DIRECTORY, 2531 (macop_t)mac_biba_create_devfs_directory }, 2532 { MAC_CREATE_DEVFS_SYMLINK, 2533 (macop_t)mac_biba_create_devfs_symlink }, 2534 { MAC_CREATE_DEVFS_VNODE, 2535 (macop_t)mac_biba_create_devfs_vnode }, 2536 { MAC_CREATE_MOUNT, 2537 (macop_t)mac_biba_create_mount }, 2538 { MAC_CREATE_ROOT_MOUNT, 2539 (macop_t)mac_biba_create_root_mount }, 2540 { MAC_RELABEL_VNODE, 2541 (macop_t)mac_biba_relabel_vnode }, 2542 { MAC_UPDATE_DEVFSDIRENT, 2543 (macop_t)mac_biba_update_devfsdirent }, 2544 { MAC_ASSOCIATE_VNODE_DEVFS, 2545 (macop_t)mac_biba_associate_vnode_devfs }, 2546 { MAC_ASSOCIATE_VNODE_EXTATTR, 2547 (macop_t)mac_biba_associate_vnode_extattr }, 2548 { MAC_ASSOCIATE_VNODE_SINGLELABEL, 2549 (macop_t)mac_biba_associate_vnode_singlelabel }, 2550 { MAC_CREATE_VNODE_EXTATTR, 2551 (macop_t)mac_biba_create_vnode_extattr }, 2552 { MAC_SETLABEL_VNODE_EXTATTR, 2553 (macop_t)mac_biba_setlabel_vnode_extattr }, 2554 { MAC_CREATE_MBUF_FROM_SOCKET, 2555 (macop_t)mac_biba_create_mbuf_from_socket }, 2556 { MAC_CREATE_PIPE, 2557 (macop_t)mac_biba_create_pipe }, 2558 { MAC_CREATE_SOCKET, 2559 (macop_t)mac_biba_create_socket }, 2560 { MAC_CREATE_SOCKET_FROM_SOCKET, 2561 (macop_t)mac_biba_create_socket_from_socket }, 2562 { MAC_RELABEL_PIPE, 2563 (macop_t)mac_biba_relabel_pipe }, 2564 { MAC_RELABEL_SOCKET, 2565 (macop_t)mac_biba_relabel_socket }, 2566 { MAC_SET_SOCKET_PEER_FROM_MBUF, 2567 (macop_t)mac_biba_set_socket_peer_from_mbuf }, 2568 { MAC_SET_SOCKET_PEER_FROM_SOCKET, 2569 (macop_t)mac_biba_set_socket_peer_from_socket }, 2570 { MAC_CREATE_BPFDESC, 2571 (macop_t)mac_biba_create_bpfdesc }, 2572 { MAC_CREATE_DATAGRAM_FROM_IPQ, 2573 (macop_t)mac_biba_create_datagram_from_ipq }, 2574 { MAC_CREATE_FRAGMENT, 2575 (macop_t)mac_biba_create_fragment }, 2576 { MAC_CREATE_IFNET, 2577 (macop_t)mac_biba_create_ifnet }, 2578 { MAC_CREATE_IPQ, 2579 (macop_t)mac_biba_create_ipq }, 2580 { MAC_CREATE_MBUF_FROM_MBUF, 2581 (macop_t)mac_biba_create_mbuf_from_mbuf }, 2582 { MAC_CREATE_MBUF_LINKLAYER, 2583 (macop_t)mac_biba_create_mbuf_linklayer }, 2584 { MAC_CREATE_MBUF_FROM_BPFDESC, 2585 (macop_t)mac_biba_create_mbuf_from_bpfdesc }, 2586 { MAC_CREATE_MBUF_FROM_IFNET, 2587 (macop_t)mac_biba_create_mbuf_from_ifnet }, 2588 { MAC_CREATE_MBUF_MULTICAST_ENCAP, 2589 (macop_t)mac_biba_create_mbuf_multicast_encap }, 2590 { MAC_CREATE_MBUF_NETLAYER, 2591 (macop_t)mac_biba_create_mbuf_netlayer }, 2592 { MAC_FRAGMENT_MATCH, 2593 (macop_t)mac_biba_fragment_match }, 2594 { MAC_RELABEL_IFNET, 2595 (macop_t)mac_biba_relabel_ifnet }, 2596 { MAC_UPDATE_IPQ, 2597 (macop_t)mac_biba_update_ipq }, 2598 { MAC_CREATE_CRED, 2599 (macop_t)mac_biba_create_cred }, 2600 { MAC_EXECVE_TRANSITION, 2601 (macop_t)mac_biba_execve_transition }, 2602 { MAC_EXECVE_WILL_TRANSITION, 2603 (macop_t)mac_biba_execve_will_transition }, 2604 { MAC_CREATE_PROC0, 2605 (macop_t)mac_biba_create_proc0 }, 2606 { MAC_CREATE_PROC1, 2607 (macop_t)mac_biba_create_proc1 }, 2608 { MAC_RELABEL_CRED, 2609 (macop_t)mac_biba_relabel_cred }, 2610 { MAC_CHECK_BPFDESC_RECEIVE, 2611 (macop_t)mac_biba_check_bpfdesc_receive }, 2612 { MAC_CHECK_CRED_RELABEL, 2613 (macop_t)mac_biba_check_cred_relabel }, 2614 { MAC_CHECK_CRED_VISIBLE, 2615 (macop_t)mac_biba_check_cred_visible }, 2616 { MAC_CHECK_IFNET_RELABEL, 2617 (macop_t)mac_biba_check_ifnet_relabel }, 2618 { MAC_CHECK_IFNET_TRANSMIT, 2619 (macop_t)mac_biba_check_ifnet_transmit }, 2620 { MAC_CHECK_MOUNT_STAT, 2621 (macop_t)mac_biba_check_mount_stat }, 2622 { MAC_CHECK_PIPE_IOCTL, 2623 (macop_t)mac_biba_check_pipe_ioctl }, 2624 { MAC_CHECK_PIPE_POLL, 2625 (macop_t)mac_biba_check_pipe_poll }, 2626 { MAC_CHECK_PIPE_READ, 2627 (macop_t)mac_biba_check_pipe_read }, 2628 { MAC_CHECK_PIPE_RELABEL, 2629 (macop_t)mac_biba_check_pipe_relabel }, 2630 { MAC_CHECK_PIPE_STAT, 2631 (macop_t)mac_biba_check_pipe_stat }, 2632 { MAC_CHECK_PIPE_WRITE, 2633 (macop_t)mac_biba_check_pipe_write }, 2634 { MAC_CHECK_PROC_DEBUG, 2635 (macop_t)mac_biba_check_proc_debug }, 2636 { MAC_CHECK_PROC_SCHED, 2637 (macop_t)mac_biba_check_proc_sched }, 2638 { MAC_CHECK_PROC_SIGNAL, 2639 (macop_t)mac_biba_check_proc_signal }, 2640 { MAC_CHECK_SOCKET_DELIVER, 2641 (macop_t)mac_biba_check_socket_deliver }, 2642 { MAC_CHECK_SOCKET_RELABEL, 2643 (macop_t)mac_biba_check_socket_relabel }, 2644 { MAC_CHECK_SOCKET_VISIBLE, 2645 (macop_t)mac_biba_check_socket_visible }, 2646 { MAC_CHECK_VNODE_ACCESS, 2647 (macop_t)mac_biba_check_vnode_open }, 2648 { MAC_CHECK_VNODE_CHDIR, 2649 (macop_t)mac_biba_check_vnode_chdir }, 2650 { MAC_CHECK_VNODE_CHROOT, 2651 (macop_t)mac_biba_check_vnode_chroot }, 2652 { MAC_CHECK_VNODE_CREATE, 2653 (macop_t)mac_biba_check_vnode_create }, 2654 { MAC_CHECK_VNODE_DELETE, 2655 (macop_t)mac_biba_check_vnode_delete }, 2656 { MAC_CHECK_VNODE_DELETEACL, 2657 (macop_t)mac_biba_check_vnode_deleteacl }, 2658 { MAC_CHECK_VNODE_EXEC, 2659 (macop_t)mac_biba_check_vnode_exec }, 2660 { MAC_CHECK_VNODE_GETACL, 2661 (macop_t)mac_biba_check_vnode_getacl }, 2662 { MAC_CHECK_VNODE_GETEXTATTR, 2663 (macop_t)mac_biba_check_vnode_getextattr }, 2664 { MAC_CHECK_VNODE_LINK, 2665 (macop_t)mac_biba_check_vnode_link }, 2666 { MAC_CHECK_VNODE_LOOKUP, 2667 (macop_t)mac_biba_check_vnode_lookup }, 2668 { MAC_CHECK_VNODE_MMAP, 2669 (macop_t)mac_biba_check_vnode_mmap }, 2670 { MAC_CHECK_VNODE_MPROTECT, 2671 (macop_t)mac_biba_check_vnode_mmap }, 2672 { MAC_CHECK_VNODE_OPEN, 2673 (macop_t)mac_biba_check_vnode_open }, 2674 { MAC_CHECK_VNODE_POLL, 2675 (macop_t)mac_biba_check_vnode_poll }, 2676 { MAC_CHECK_VNODE_READ, 2677 (macop_t)mac_biba_check_vnode_read }, 2678 { MAC_CHECK_VNODE_READDIR, 2679 (macop_t)mac_biba_check_vnode_readdir }, 2680 { MAC_CHECK_VNODE_READLINK, 2681 (macop_t)mac_biba_check_vnode_readlink }, 2682 { MAC_CHECK_VNODE_RELABEL, 2683 (macop_t)mac_biba_check_vnode_relabel }, 2684 { MAC_CHECK_VNODE_RENAME_FROM, 2685 (macop_t)mac_biba_check_vnode_rename_from }, 2686 { MAC_CHECK_VNODE_RENAME_TO, 2687 (macop_t)mac_biba_check_vnode_rename_to }, 2688 { MAC_CHECK_VNODE_REVOKE, 2689 (macop_t)mac_biba_check_vnode_revoke }, 2690 { MAC_CHECK_VNODE_SETACL, 2691 (macop_t)mac_biba_check_vnode_setacl }, 2692 { MAC_CHECK_VNODE_SETEXTATTR, 2693 (macop_t)mac_biba_check_vnode_setextattr }, 2694 { MAC_CHECK_VNODE_SETFLAGS, 2695 (macop_t)mac_biba_check_vnode_setflags }, 2696 { MAC_CHECK_VNODE_SETMODE, 2697 (macop_t)mac_biba_check_vnode_setmode }, 2698 { MAC_CHECK_VNODE_SETOWNER, 2699 (macop_t)mac_biba_check_vnode_setowner }, 2700 { MAC_CHECK_VNODE_SETUTIMES, 2701 (macop_t)mac_biba_check_vnode_setutimes }, 2702 { MAC_CHECK_VNODE_STAT, 2703 (macop_t)mac_biba_check_vnode_stat }, 2704 { MAC_CHECK_VNODE_WRITE, 2705 (macop_t)mac_biba_check_vnode_write }, 2706 { MAC_OP_LAST, NULL } 2707}; 2708 2709MAC_POLICY_SET(mac_biba_ops, trustedbsd_mac_biba, "TrustedBSD MAC/Biba", 2710 MPC_LOADTIME_FLAG_NOTLATE, &mac_biba_slot); 2711