mac_biba.c revision 116701
1/*- 2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson 3 * Copyright (c) 2001, 2002, 2003 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 116701 2003-06-23 01:26:34Z 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/sbuf.h> 53#include <sys/systm.h> 54#include <sys/sysproto.h> 55#include <sys/sysent.h> 56#include <sys/systm.h> 57#include <sys/vnode.h> 58#include <sys/file.h> 59#include <sys/socket.h> 60#include <sys/socketvar.h> 61#include <sys/pipe.h> 62#include <sys/sysctl.h> 63 64#include <fs/devfs/devfs.h> 65 66#include <net/bpfdesc.h> 67#include <net/if.h> 68#include <net/if_types.h> 69#include <net/if_var.h> 70 71#include <netinet/in.h> 72#include <netinet/ip_var.h> 73 74#include <vm/vm.h> 75 76#include <sys/mac_policy.h> 77 78#include <security/mac_biba/mac_biba.h> 79 80SYSCTL_DECL(_security_mac); 81 82SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0, 83 "TrustedBSD mac_biba policy controls"); 84 85static int mac_biba_label_size = sizeof(struct mac_biba); 86SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD, 87 &mac_biba_label_size, 0, "Size of struct mac_biba"); 88 89static int mac_biba_enabled = 1; 90SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, 91 &mac_biba_enabled, 0, "Enforce MAC/Biba policy"); 92TUNABLE_INT("security.mac.biba.enabled", &mac_biba_enabled); 93 94static int destroyed_not_inited; 95SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 96 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 97 98static int trust_all_interfaces = 0; 99SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, 100 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); 101TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces); 102 103static char trusted_interfaces[128]; 104SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD, 105 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); 106TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces, 107 sizeof(trusted_interfaces)); 108 109static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS; 110SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD, 111 &max_compartments, 0, "Maximum supported compartments"); 112 113static int ptys_equal = 0; 114SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, 115 &ptys_equal, 0, "Label pty devices as biba/equal on create"); 116TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal); 117 118static int revocation_enabled = 0; 119SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW, 120 &revocation_enabled, 0, "Revoke access to objects on relabel"); 121TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled); 122 123static int mac_biba_slot; 124#define SLOT(l) ((struct mac_biba *)LABEL_TO_SLOT((l), mac_biba_slot).l_ptr) 125 126MALLOC_DEFINE(M_MACBIBA, "biba label", "MAC/Biba labels"); 127 128static __inline int 129biba_bit_set_empty(u_char *set) { 130 int i; 131 132 for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++) 133 if (set[i] != 0) 134 return (0); 135 return (1); 136} 137 138static struct mac_biba * 139biba_alloc(int flag) 140{ 141 struct mac_biba *mac_biba; 142 143 mac_biba = malloc(sizeof(struct mac_biba), M_MACBIBA, M_ZERO | flag); 144 145 return (mac_biba); 146} 147 148static void 149biba_free(struct mac_biba *mac_biba) 150{ 151 152 if (mac_biba != NULL) 153 free(mac_biba, M_MACBIBA); 154 else 155 atomic_add_int(&destroyed_not_inited, 1); 156} 157 158static int 159biba_atmostflags(struct mac_biba *mac_biba, int flags) 160{ 161 162 if ((mac_biba->mb_flags & flags) != mac_biba->mb_flags) 163 return (EINVAL); 164 return (0); 165} 166 167static int 168mac_biba_dominate_element(struct mac_biba_element *a, 169 struct mac_biba_element *b) 170{ 171 int bit; 172 173 switch (a->mbe_type) { 174 case MAC_BIBA_TYPE_EQUAL: 175 case MAC_BIBA_TYPE_HIGH: 176 return (1); 177 178 case MAC_BIBA_TYPE_LOW: 179 switch (b->mbe_type) { 180 case MAC_BIBA_TYPE_GRADE: 181 case MAC_BIBA_TYPE_HIGH: 182 return (0); 183 184 case MAC_BIBA_TYPE_EQUAL: 185 case MAC_BIBA_TYPE_LOW: 186 return (1); 187 188 default: 189 panic("mac_biba_dominate_element: b->mbe_type invalid"); 190 } 191 192 case MAC_BIBA_TYPE_GRADE: 193 switch (b->mbe_type) { 194 case MAC_BIBA_TYPE_EQUAL: 195 case MAC_BIBA_TYPE_LOW: 196 return (1); 197 198 case MAC_BIBA_TYPE_HIGH: 199 return (0); 200 201 case MAC_BIBA_TYPE_GRADE: 202 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) 203 if (!MAC_BIBA_BIT_TEST(bit, 204 a->mbe_compartments) && 205 MAC_BIBA_BIT_TEST(bit, b->mbe_compartments)) 206 return (0); 207 return (a->mbe_grade >= b->mbe_grade); 208 209 default: 210 panic("mac_biba_dominate_element: b->mbe_type invalid"); 211 } 212 213 default: 214 panic("mac_biba_dominate_element: a->mbe_type invalid"); 215 } 216 217 return (0); 218} 219 220static int 221mac_biba_subject_dominate_high(struct mac_biba *mac_biba) 222{ 223 struct mac_biba_element *element; 224 225 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 226 ("mac_biba_single_in_range: mac_biba not single")); 227 element = &mac_biba->mb_single; 228 229 return (element->mbe_type == MAC_BIBA_TYPE_EQUAL || 230 element->mbe_type == MAC_BIBA_TYPE_HIGH); 231} 232 233static int 234mac_biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb) 235{ 236 237 return (mac_biba_dominate_element(&rangeb->mb_rangehigh, 238 &rangea->mb_rangehigh) && 239 mac_biba_dominate_element(&rangea->mb_rangelow, 240 &rangeb->mb_rangelow)); 241} 242 243static int 244mac_biba_single_in_range(struct mac_biba *single, struct mac_biba *range) 245{ 246 247 KASSERT((single->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 248 ("mac_biba_single_in_range: a not single")); 249 KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 250 ("mac_biba_single_in_range: b not range")); 251 252 return (mac_biba_dominate_element(&range->mb_rangehigh, 253 &single->mb_single) && 254 mac_biba_dominate_element(&single->mb_single, 255 &range->mb_rangelow)); 256 257 return (1); 258} 259 260static int 261mac_biba_dominate_single(struct mac_biba *a, struct mac_biba *b) 262{ 263 KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 264 ("mac_biba_dominate_single: a not single")); 265 KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 266 ("mac_biba_dominate_single: b not single")); 267 268 return (mac_biba_dominate_element(&a->mb_single, &b->mb_single)); 269} 270 271static int 272mac_biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b) 273{ 274 275 if (a->mbe_type == MAC_BIBA_TYPE_EQUAL || 276 b->mbe_type == MAC_BIBA_TYPE_EQUAL) 277 return (1); 278 279 return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade); 280} 281 282static int 283mac_biba_equal_single(struct mac_biba *a, struct mac_biba *b) 284{ 285 286 KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 287 ("mac_biba_equal_single: a not single")); 288 KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 289 ("mac_biba_equal_single: b not single")); 290 291 return (mac_biba_equal_element(&a->mb_single, &b->mb_single)); 292} 293 294static int 295mac_biba_contains_equal(struct mac_biba *mac_biba) 296{ 297 298 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) 299 if (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_EQUAL) 300 return (1); 301 302 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 303 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL) 304 return (1); 305 if (mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 306 return (1); 307 } 308 309 return (0); 310} 311 312static int 313mac_biba_subject_privileged(struct mac_biba *mac_biba) 314{ 315 316 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAGS_BOTH) == 317 MAC_BIBA_FLAGS_BOTH, 318 ("mac_biba_subject_privileged: subject doesn't have both labels")); 319 320 /* If the single is EQUAL, it's ok. */ 321 if (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_EQUAL) 322 return (0); 323 324 /* If either range endpoint is EQUAL, it's ok. */ 325 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL || 326 mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) 327 return (0); 328 329 /* If the range is low-high, it's ok. */ 330 if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW && 331 mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH) 332 return (0); 333 334 /* It's not ok. */ 335 return (EPERM); 336} 337 338static int 339mac_biba_high_single(struct mac_biba *mac_biba) 340{ 341 342 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 343 ("mac_biba_equal_single: mac_biba not single")); 344 345 return (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_HIGH); 346} 347 348static int 349mac_biba_valid(struct mac_biba *mac_biba) 350{ 351 352 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { 353 switch (mac_biba->mb_single.mbe_type) { 354 case MAC_BIBA_TYPE_GRADE: 355 break; 356 357 case MAC_BIBA_TYPE_EQUAL: 358 case MAC_BIBA_TYPE_HIGH: 359 case MAC_BIBA_TYPE_LOW: 360 if (mac_biba->mb_single.mbe_grade != 0 || 361 !MAC_BIBA_BIT_SET_EMPTY( 362 mac_biba->mb_single.mbe_compartments)) 363 return (EINVAL); 364 break; 365 366 default: 367 return (EINVAL); 368 } 369 } else { 370 if (mac_biba->mb_single.mbe_type != MAC_BIBA_TYPE_UNDEF) 371 return (EINVAL); 372 } 373 374 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 375 switch (mac_biba->mb_rangelow.mbe_type) { 376 case MAC_BIBA_TYPE_GRADE: 377 break; 378 379 case MAC_BIBA_TYPE_EQUAL: 380 case MAC_BIBA_TYPE_HIGH: 381 case MAC_BIBA_TYPE_LOW: 382 if (mac_biba->mb_rangelow.mbe_grade != 0 || 383 !MAC_BIBA_BIT_SET_EMPTY( 384 mac_biba->mb_rangelow.mbe_compartments)) 385 return (EINVAL); 386 break; 387 388 default: 389 return (EINVAL); 390 } 391 392 switch (mac_biba->mb_rangehigh.mbe_type) { 393 case MAC_BIBA_TYPE_GRADE: 394 break; 395 396 case MAC_BIBA_TYPE_EQUAL: 397 case MAC_BIBA_TYPE_HIGH: 398 case MAC_BIBA_TYPE_LOW: 399 if (mac_biba->mb_rangehigh.mbe_grade != 0 || 400 !MAC_BIBA_BIT_SET_EMPTY( 401 mac_biba->mb_rangehigh.mbe_compartments)) 402 return (EINVAL); 403 break; 404 405 default: 406 return (EINVAL); 407 } 408 if (!mac_biba_dominate_element(&mac_biba->mb_rangehigh, 409 &mac_biba->mb_rangelow)) 410 return (EINVAL); 411 } else { 412 if (mac_biba->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF || 413 mac_biba->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF) 414 return (EINVAL); 415 } 416 417 return (0); 418} 419 420static void 421mac_biba_set_range(struct mac_biba *mac_biba, u_short typelow, 422 u_short gradelow, u_char *compartmentslow, u_short typehigh, 423 u_short gradehigh, u_char *compartmentshigh) 424{ 425 426 mac_biba->mb_rangelow.mbe_type = typelow; 427 mac_biba->mb_rangelow.mbe_grade = gradelow; 428 if (compartmentslow != NULL) 429 memcpy(mac_biba->mb_rangelow.mbe_compartments, 430 compartmentslow, 431 sizeof(mac_biba->mb_rangelow.mbe_compartments)); 432 mac_biba->mb_rangehigh.mbe_type = typehigh; 433 mac_biba->mb_rangehigh.mbe_grade = gradehigh; 434 if (compartmentshigh != NULL) 435 memcpy(mac_biba->mb_rangehigh.mbe_compartments, 436 compartmentshigh, 437 sizeof(mac_biba->mb_rangehigh.mbe_compartments)); 438 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 439} 440 441static void 442mac_biba_set_single(struct mac_biba *mac_biba, u_short type, u_short grade, 443 u_char *compartments) 444{ 445 446 mac_biba->mb_single.mbe_type = type; 447 mac_biba->mb_single.mbe_grade = grade; 448 if (compartments != NULL) 449 memcpy(mac_biba->mb_single.mbe_compartments, compartments, 450 sizeof(mac_biba->mb_single.mbe_compartments)); 451 mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; 452} 453 454static void 455mac_biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto) 456{ 457 458 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 459 ("mac_biba_copy_range: labelfrom not range")); 460 461 labelto->mb_rangelow = labelfrom->mb_rangelow; 462 labelto->mb_rangehigh = labelfrom->mb_rangehigh; 463 labelto->mb_flags |= MAC_BIBA_FLAG_RANGE; 464} 465 466static void 467mac_biba_copy_single(struct mac_biba *labelfrom, struct mac_biba *labelto) 468{ 469 470 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 471 ("mac_biba_copy_single: labelfrom not single")); 472 473 labelto->mb_single = labelfrom->mb_single; 474 labelto->mb_flags |= MAC_BIBA_FLAG_SINGLE; 475} 476 477static void 478mac_biba_copy(struct mac_biba *source, struct mac_biba *dest) 479{ 480 481 if (source->mb_flags & MAC_BIBA_FLAG_SINGLE) 482 mac_biba_copy_single(source, dest); 483 if (source->mb_flags & MAC_BIBA_FLAG_RANGE) 484 mac_biba_copy_range(source, dest); 485} 486 487/* 488 * Policy module operations. 489 */ 490static void 491mac_biba_destroy(struct mac_policy_conf *conf) 492{ 493 494} 495 496static void 497mac_biba_init(struct mac_policy_conf *conf) 498{ 499 500} 501 502/* 503 * Label operations. 504 */ 505static void 506mac_biba_init_label(struct label *label) 507{ 508 509 SLOT(label) = biba_alloc(M_WAITOK); 510} 511 512static int 513mac_biba_init_label_waitcheck(struct label *label, int flag) 514{ 515 516 SLOT(label) = biba_alloc(flag); 517 if (SLOT(label) == NULL) 518 return (ENOMEM); 519 520 return (0); 521} 522 523static void 524mac_biba_destroy_label(struct label *label) 525{ 526 527 biba_free(SLOT(label)); 528 SLOT(label) = NULL; 529} 530 531/* 532 * mac_biba_element_to_string() accepts an sbuf and Biba element. It 533 * converts the Biba element to a string and stores the result in the 534 * sbuf; if there isn't space in the sbuf, -1 is returned. 535 */ 536static int 537mac_biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element) 538{ 539 int i, first; 540 541 switch (element->mbe_type) { 542 case MAC_BIBA_TYPE_HIGH: 543 return (sbuf_printf(sb, "high")); 544 545 case MAC_BIBA_TYPE_LOW: 546 return (sbuf_printf(sb, "low")); 547 548 case MAC_BIBA_TYPE_EQUAL: 549 return (sbuf_printf(sb, "equal")); 550 551 case MAC_BIBA_TYPE_GRADE: 552 if (sbuf_printf(sb, "%d", element->mbe_grade) == -1) 553 return (-1); 554 555 first = 1; 556 for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) { 557 if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) { 558 if (first) { 559 if (sbuf_putc(sb, ':') == -1) 560 return (-1); 561 if (sbuf_printf(sb, "%d", i) == -1) 562 return (-1); 563 first = 0; 564 } else { 565 if (sbuf_printf(sb, "+%d", i) == -1) 566 return (-1); 567 } 568 } 569 } 570 return (0); 571 572 default: 573 panic("mac_biba_element_to_string: invalid type (%d)", 574 element->mbe_type); 575 } 576} 577 578/* 579 * mac_biba_to_string() converts a Biba label to a string, and places 580 * the results in the passed sbuf. It returns 0 on success, or EINVAL 581 * if there isn't room in the sbuf. Note: the sbuf will be modified 582 * even in a failure case, so the caller may need to revert the sbuf 583 * by restoring the offset if that's undesired. 584 */ 585static int 586mac_biba_to_string(struct sbuf *sb, struct mac_biba *mac_biba) 587{ 588 589 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { 590 if (mac_biba_element_to_string(sb, &mac_biba->mb_single) 591 == -1) 592 return (EINVAL); 593 } 594 595 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 596 if (sbuf_putc(sb, '(') == -1) 597 return (EINVAL); 598 599 if (mac_biba_element_to_string(sb, &mac_biba->mb_rangelow) 600 == -1) 601 return (EINVAL); 602 603 if (sbuf_putc(sb, '-') == -1) 604 return (EINVAL); 605 606 if (mac_biba_element_to_string(sb, &mac_biba->mb_rangehigh) 607 == -1) 608 return (EINVAL); 609 610 if (sbuf_putc(sb, ')') == -1) 611 return (EINVAL); 612 } 613 614 return (0); 615} 616 617static int 618mac_biba_externalize_label(struct label *label, char *element_name, 619 struct sbuf *sb, int *claimed) 620{ 621 struct mac_biba *mac_biba; 622 623 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 624 return (0); 625 626 (*claimed)++; 627 628 mac_biba = SLOT(label); 629 return (mac_biba_to_string(sb, mac_biba)); 630} 631 632static int 633mac_biba_parse_element(struct mac_biba_element *element, char *string) 634{ 635 char *compartment, *end, *grade; 636 int value; 637 638 if (strcmp(string, "high") == 0 || 639 strcmp(string, "hi") == 0) { 640 element->mbe_type = MAC_BIBA_TYPE_HIGH; 641 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 642 } else if (strcmp(string, "low") == 0 || 643 strcmp(string, "lo") == 0) { 644 element->mbe_type = MAC_BIBA_TYPE_LOW; 645 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 646 } else if (strcmp(string, "equal") == 0 || 647 strcmp(string, "eq") == 0) { 648 element->mbe_type = MAC_BIBA_TYPE_EQUAL; 649 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 650 } else { 651 element->mbe_type = MAC_BIBA_TYPE_GRADE; 652 653 /* 654 * Numeric grade piece of the element. 655 */ 656 grade = strsep(&string, ":"); 657 value = strtol(grade, &end, 10); 658 if (end == grade || *end != '\0') 659 return (EINVAL); 660 if (value < 0 || value > 65535) 661 return (EINVAL); 662 element->mbe_grade = value; 663 664 /* 665 * Optional compartment piece of the element. If none 666 * are included, we assume that the label has no 667 * compartments. 668 */ 669 if (string == NULL) 670 return (0); 671 if (*string == '\0') 672 return (0); 673 674 while ((compartment = strsep(&string, "+")) != NULL) { 675 value = strtol(compartment, &end, 10); 676 if (compartment == end || *end != '\0') 677 return (EINVAL); 678 if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS) 679 return (EINVAL); 680 MAC_BIBA_BIT_SET(value, element->mbe_compartments); 681 } 682 } 683 684 return (0); 685} 686 687/* 688 * Note: destructively consumes the string, make a local copy before 689 * calling if that's a problem. 690 */ 691static int 692mac_biba_parse(struct mac_biba *mac_biba, char *string) 693{ 694 char *rangehigh, *rangelow, *single; 695 int error; 696 697 single = strsep(&string, "("); 698 if (*single == '\0') 699 single = NULL; 700 701 if (string != NULL) { 702 rangelow = strsep(&string, "-"); 703 if (string == NULL) 704 return (EINVAL); 705 rangehigh = strsep(&string, ")"); 706 if (string == NULL) 707 return (EINVAL); 708 if (*string != '\0') 709 return (EINVAL); 710 } else { 711 rangelow = NULL; 712 rangehigh = NULL; 713 } 714 715 KASSERT((rangelow != NULL && rangehigh != NULL) || 716 (rangelow == NULL && rangehigh == NULL), 717 ("mac_biba_parse: range mismatch")); 718 719 bzero(mac_biba, sizeof(*mac_biba)); 720 if (single != NULL) { 721 error = mac_biba_parse_element(&mac_biba->mb_single, single); 722 if (error) 723 return (error); 724 mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; 725 } 726 727 if (rangelow != NULL) { 728 error = mac_biba_parse_element(&mac_biba->mb_rangelow, 729 rangelow); 730 if (error) 731 return (error); 732 error = mac_biba_parse_element(&mac_biba->mb_rangehigh, 733 rangehigh); 734 if (error) 735 return (error); 736 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 737 } 738 739 error = mac_biba_valid(mac_biba); 740 if (error) 741 return (error); 742 743 return (0); 744} 745 746static int 747mac_biba_internalize_label(struct label *label, char *element_name, 748 char *element_data, int *claimed) 749{ 750 struct mac_biba *mac_biba, mac_biba_temp; 751 int error; 752 753 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 754 return (0); 755 756 (*claimed)++; 757 758 error = mac_biba_parse(&mac_biba_temp, element_data); 759 if (error) 760 return (error); 761 762 mac_biba = SLOT(label); 763 *mac_biba = mac_biba_temp; 764 765 return (0); 766} 767 768static void 769mac_biba_copy_label(struct label *src, struct label *dest) 770{ 771 772 *SLOT(dest) = *SLOT(src); 773} 774 775/* 776 * Labeling event operations: file system objects, and things that look 777 * a lot like file system objects. 778 */ 779static void 780mac_biba_create_devfs_device(struct mount *mp, dev_t dev, 781 struct devfs_dirent *devfs_dirent, struct label *label) 782{ 783 struct mac_biba *mac_biba; 784 int biba_type; 785 786 mac_biba = SLOT(label); 787 if (strcmp(dev->si_name, "null") == 0 || 788 strcmp(dev->si_name, "zero") == 0 || 789 strcmp(dev->si_name, "random") == 0 || 790 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 791 biba_type = MAC_BIBA_TYPE_EQUAL; 792 else if (ptys_equal && 793 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 794 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 795 biba_type = MAC_BIBA_TYPE_EQUAL; 796 else 797 biba_type = MAC_BIBA_TYPE_HIGH; 798 mac_biba_set_single(mac_biba, biba_type, 0, NULL); 799} 800 801static void 802mac_biba_create_devfs_directory(struct mount *mp, char *dirname, 803 int dirnamelen, struct devfs_dirent *devfs_dirent, struct label *label) 804{ 805 struct mac_biba *mac_biba; 806 807 mac_biba = SLOT(label); 808 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 809} 810 811static void 812mac_biba_create_devfs_symlink(struct ucred *cred, struct mount *mp, 813 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 814 struct label *delabel) 815{ 816 struct mac_biba *source, *dest; 817 818 source = SLOT(&cred->cr_label); 819 dest = SLOT(delabel); 820 821 mac_biba_copy_single(source, dest); 822} 823 824static void 825mac_biba_create_mount(struct ucred *cred, struct mount *mp, 826 struct label *mntlabel, struct label *fslabel) 827{ 828 struct mac_biba *source, *dest; 829 830 source = SLOT(&cred->cr_label); 831 dest = SLOT(mntlabel); 832 mac_biba_copy_single(source, dest); 833 dest = SLOT(fslabel); 834 mac_biba_copy_single(source, dest); 835} 836 837static void 838mac_biba_create_root_mount(struct ucred *cred, struct mount *mp, 839 struct label *mntlabel, struct label *fslabel) 840{ 841 struct mac_biba *mac_biba; 842 843 /* Always mount root as high integrity. */ 844 mac_biba = SLOT(fslabel); 845 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 846 mac_biba = SLOT(mntlabel); 847 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 848} 849 850static void 851mac_biba_relabel_vnode(struct ucred *cred, struct vnode *vp, 852 struct label *vnodelabel, struct label *label) 853{ 854 struct mac_biba *source, *dest; 855 856 source = SLOT(label); 857 dest = SLOT(vnodelabel); 858 859 mac_biba_copy(source, dest); 860} 861 862static void 863mac_biba_update_devfsdirent(struct mount *mp, 864 struct devfs_dirent *devfs_dirent, struct label *direntlabel, 865 struct vnode *vp, struct label *vnodelabel) 866{ 867 struct mac_biba *source, *dest; 868 869 source = SLOT(vnodelabel); 870 dest = SLOT(direntlabel); 871 872 mac_biba_copy(source, dest); 873} 874 875static void 876mac_biba_associate_vnode_devfs(struct mount *mp, struct label *fslabel, 877 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 878 struct label *vlabel) 879{ 880 struct mac_biba *source, *dest; 881 882 source = SLOT(delabel); 883 dest = SLOT(vlabel); 884 885 mac_biba_copy_single(source, dest); 886} 887 888static int 889mac_biba_associate_vnode_extattr(struct mount *mp, struct label *fslabel, 890 struct vnode *vp, struct label *vlabel) 891{ 892 struct mac_biba temp, *source, *dest; 893 int buflen, error; 894 895 source = SLOT(fslabel); 896 dest = SLOT(vlabel); 897 898 buflen = sizeof(temp); 899 bzero(&temp, buflen); 900 901 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 902 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &temp, curthread); 903 if (error == ENOATTR || error == EOPNOTSUPP) { 904 /* Fall back to the fslabel. */ 905 mac_biba_copy_single(source, dest); 906 return (0); 907 } else if (error) 908 return (error); 909 910 if (buflen != sizeof(temp)) { 911 printf("mac_biba_associate_vnode_extattr: bad size %d\n", 912 buflen); 913 return (EPERM); 914 } 915 if (mac_biba_valid(&temp) != 0) { 916 printf("mac_biba_associate_vnode_extattr: invalid\n"); 917 return (EPERM); 918 } 919 if ((temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) { 920 printf("mac_biba_associate_vnode_extattr: not single\n"); 921 return (EPERM); 922 } 923 924 mac_biba_copy_single(&temp, dest); 925 return (0); 926} 927 928static void 929mac_biba_associate_vnode_singlelabel(struct mount *mp, 930 struct label *fslabel, struct vnode *vp, struct label *vlabel) 931{ 932 struct mac_biba *source, *dest; 933 934 source = SLOT(fslabel); 935 dest = SLOT(vlabel); 936 937 mac_biba_copy_single(source, dest); 938} 939 940static int 941mac_biba_create_vnode_extattr(struct ucred *cred, struct mount *mp, 942 struct label *fslabel, struct vnode *dvp, struct label *dlabel, 943 struct vnode *vp, struct label *vlabel, struct componentname *cnp) 944{ 945 struct mac_biba *source, *dest, temp; 946 size_t buflen; 947 int error; 948 949 buflen = sizeof(temp); 950 bzero(&temp, buflen); 951 952 source = SLOT(&cred->cr_label); 953 dest = SLOT(vlabel); 954 mac_biba_copy_single(source, &temp); 955 956 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 957 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 958 if (error == 0) 959 mac_biba_copy_single(source, dest); 960 return (error); 961} 962 963static int 964mac_biba_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 965 struct label *vlabel, struct label *intlabel) 966{ 967 struct mac_biba *source, temp; 968 size_t buflen; 969 int error; 970 971 buflen = sizeof(temp); 972 bzero(&temp, buflen); 973 974 source = SLOT(intlabel); 975 if ((source->mb_flags & MAC_BIBA_FLAG_SINGLE) == 0) 976 return (0); 977 978 mac_biba_copy_single(source, &temp); 979 980 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 981 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 982 return (error); 983} 984 985/* 986 * Labeling event operations: IPC object. 987 */ 988static void 989mac_biba_create_mbuf_from_socket(struct socket *so, struct label *socketlabel, 990 struct mbuf *m, struct label *mbuflabel) 991{ 992 struct mac_biba *source, *dest; 993 994 source = SLOT(socketlabel); 995 dest = SLOT(mbuflabel); 996 997 mac_biba_copy_single(source, dest); 998} 999 1000static void 1001mac_biba_create_socket(struct ucred *cred, struct socket *socket, 1002 struct label *socketlabel) 1003{ 1004 struct mac_biba *source, *dest; 1005 1006 source = SLOT(&cred->cr_label); 1007 dest = SLOT(socketlabel); 1008 1009 mac_biba_copy_single(source, dest); 1010} 1011 1012static void 1013mac_biba_create_pipe(struct ucred *cred, struct pipe *pipe, 1014 struct label *pipelabel) 1015{ 1016 struct mac_biba *source, *dest; 1017 1018 source = SLOT(&cred->cr_label); 1019 dest = SLOT(pipelabel); 1020 1021 mac_biba_copy_single(source, dest); 1022} 1023 1024static void 1025mac_biba_create_socket_from_socket(struct socket *oldsocket, 1026 struct label *oldsocketlabel, struct socket *newsocket, 1027 struct label *newsocketlabel) 1028{ 1029 struct mac_biba *source, *dest; 1030 1031 source = SLOT(oldsocketlabel); 1032 dest = SLOT(newsocketlabel); 1033 1034 mac_biba_copy_single(source, dest); 1035} 1036 1037static void 1038mac_biba_relabel_socket(struct ucred *cred, struct socket *socket, 1039 struct label *socketlabel, struct label *newlabel) 1040{ 1041 struct mac_biba *source, *dest; 1042 1043 source = SLOT(newlabel); 1044 dest = SLOT(socketlabel); 1045 1046 mac_biba_copy(source, dest); 1047} 1048 1049static void 1050mac_biba_relabel_pipe(struct ucred *cred, struct pipe *pipe, 1051 struct label *pipelabel, struct label *newlabel) 1052{ 1053 struct mac_biba *source, *dest; 1054 1055 source = SLOT(newlabel); 1056 dest = SLOT(pipelabel); 1057 1058 mac_biba_copy(source, dest); 1059} 1060 1061static void 1062mac_biba_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel, 1063 struct socket *socket, struct label *socketpeerlabel) 1064{ 1065 struct mac_biba *source, *dest; 1066 1067 source = SLOT(mbuflabel); 1068 dest = SLOT(socketpeerlabel); 1069 1070 mac_biba_copy_single(source, dest); 1071} 1072 1073/* 1074 * Labeling event operations: network objects. 1075 */ 1076static void 1077mac_biba_set_socket_peer_from_socket(struct socket *oldsocket, 1078 struct label *oldsocketlabel, struct socket *newsocket, 1079 struct label *newsocketpeerlabel) 1080{ 1081 struct mac_biba *source, *dest; 1082 1083 source = SLOT(oldsocketlabel); 1084 dest = SLOT(newsocketpeerlabel); 1085 1086 mac_biba_copy_single(source, dest); 1087} 1088 1089static void 1090mac_biba_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d, 1091 struct label *bpflabel) 1092{ 1093 struct mac_biba *source, *dest; 1094 1095 source = SLOT(&cred->cr_label); 1096 dest = SLOT(bpflabel); 1097 1098 mac_biba_copy_single(source, dest); 1099} 1100 1101static void 1102mac_biba_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel) 1103{ 1104 char tifname[IFNAMSIZ], ifname[IFNAMSIZ], *p, *q; 1105 char tiflist[sizeof(trusted_interfaces)]; 1106 struct mac_biba *dest; 1107 int len, type; 1108 1109 dest = SLOT(ifnetlabel); 1110 1111 if (ifnet->if_type == IFT_LOOP) { 1112 type = MAC_BIBA_TYPE_EQUAL; 1113 goto set; 1114 } 1115 1116 if (trust_all_interfaces) { 1117 type = MAC_BIBA_TYPE_HIGH; 1118 goto set; 1119 } 1120 1121 type = MAC_BIBA_TYPE_LOW; 1122 1123 if (trusted_interfaces[0] == '\0' || 1124 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1125 goto set; 1126 1127 bzero(tiflist, sizeof(tiflist)); 1128 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1129 if(*p != ' ' && *p != '\t') 1130 *q = *p; 1131 1132 snprintf(ifname, IFNAMSIZ, "%s%d", ifnet->if_name, ifnet->if_unit); 1133 1134 for (p = q = tiflist;; p++) { 1135 if (*p == ',' || *p == '\0') { 1136 len = p - q; 1137 if (len < IFNAMSIZ) { 1138 bzero(tifname, sizeof(tifname)); 1139 bcopy(q, tifname, len); 1140 if (strcmp(tifname, ifname) == 0) { 1141 type = MAC_BIBA_TYPE_HIGH; 1142 break; 1143 } 1144 } else { 1145 *p = '\0'; 1146 printf("mac_biba warning: interface name " 1147 "\"%s\" is too long (must be < %d)\n", 1148 q, IFNAMSIZ); 1149 } 1150 if (*p == '\0') 1151 break; 1152 q = p + 1; 1153 } 1154 } 1155set: 1156 mac_biba_set_single(dest, type, 0, NULL); 1157 mac_biba_set_range(dest, type, 0, NULL, type, 0, NULL); 1158} 1159 1160static void 1161mac_biba_create_ipq(struct mbuf *fragment, struct label *fragmentlabel, 1162 struct ipq *ipq, struct label *ipqlabel) 1163{ 1164 struct mac_biba *source, *dest; 1165 1166 source = SLOT(fragmentlabel); 1167 dest = SLOT(ipqlabel); 1168 1169 mac_biba_copy_single(source, dest); 1170} 1171 1172static void 1173mac_biba_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel, 1174 struct mbuf *datagram, struct label *datagramlabel) 1175{ 1176 struct mac_biba *source, *dest; 1177 1178 source = SLOT(ipqlabel); 1179 dest = SLOT(datagramlabel); 1180 1181 /* Just use the head, since we require them all to match. */ 1182 mac_biba_copy_single(source, dest); 1183} 1184 1185static void 1186mac_biba_create_fragment(struct mbuf *datagram, struct label *datagramlabel, 1187 struct mbuf *fragment, struct label *fragmentlabel) 1188{ 1189 struct mac_biba *source, *dest; 1190 1191 source = SLOT(datagramlabel); 1192 dest = SLOT(fragmentlabel); 1193 1194 mac_biba_copy_single(source, dest); 1195} 1196 1197static void 1198mac_biba_create_mbuf_from_mbuf(struct mbuf *oldmbuf, 1199 struct label *oldmbuflabel, struct mbuf *newmbuf, 1200 struct label *newmbuflabel) 1201{ 1202 struct mac_biba *source, *dest; 1203 1204 source = SLOT(oldmbuflabel); 1205 dest = SLOT(newmbuflabel); 1206 1207 /* 1208 * Because the source mbuf may not yet have been "created", 1209 * just initialized, we do a conditional copy. Since we don't 1210 * allow mbufs to have ranges, do a KASSERT to make sure that 1211 * doesn't happen. 1212 */ 1213 KASSERT((source->mb_flags & MAC_BIBA_FLAG_RANGE) == 0, 1214 ("mac_biba_create_mbuf_from_mbuf: source mbuf has range")); 1215 mac_biba_copy(source, dest); 1216} 1217 1218static void 1219mac_biba_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel, 1220 struct mbuf *mbuf, struct label *mbuflabel) 1221{ 1222 struct mac_biba *dest; 1223 1224 dest = SLOT(mbuflabel); 1225 1226 mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1227} 1228 1229static void 1230mac_biba_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel, 1231 struct mbuf *mbuf, struct label *mbuflabel) 1232{ 1233 struct mac_biba *source, *dest; 1234 1235 source = SLOT(bpflabel); 1236 dest = SLOT(mbuflabel); 1237 1238 mac_biba_copy_single(source, dest); 1239} 1240 1241static void 1242mac_biba_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel, 1243 struct mbuf *m, struct label *mbuflabel) 1244{ 1245 struct mac_biba *source, *dest; 1246 1247 source = SLOT(ifnetlabel); 1248 dest = SLOT(mbuflabel); 1249 1250 mac_biba_copy_single(source, dest); 1251} 1252 1253static void 1254mac_biba_create_mbuf_multicast_encap(struct mbuf *oldmbuf, 1255 struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel, 1256 struct mbuf *newmbuf, struct label *newmbuflabel) 1257{ 1258 struct mac_biba *source, *dest; 1259 1260 source = SLOT(oldmbuflabel); 1261 dest = SLOT(newmbuflabel); 1262 1263 mac_biba_copy_single(source, dest); 1264} 1265 1266static void 1267mac_biba_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel, 1268 struct mbuf *newmbuf, struct label *newmbuflabel) 1269{ 1270 struct mac_biba *source, *dest; 1271 1272 source = SLOT(oldmbuflabel); 1273 dest = SLOT(newmbuflabel); 1274 1275 mac_biba_copy_single(source, dest); 1276} 1277 1278static int 1279mac_biba_fragment_match(struct mbuf *fragment, struct label *fragmentlabel, 1280 struct ipq *ipq, struct label *ipqlabel) 1281{ 1282 struct mac_biba *a, *b; 1283 1284 a = SLOT(ipqlabel); 1285 b = SLOT(fragmentlabel); 1286 1287 return (mac_biba_equal_single(a, b)); 1288} 1289 1290static void 1291mac_biba_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet, 1292 struct label *ifnetlabel, struct label *newlabel) 1293{ 1294 struct mac_biba *source, *dest; 1295 1296 source = SLOT(newlabel); 1297 dest = SLOT(ifnetlabel); 1298 1299 mac_biba_copy(source, dest); 1300} 1301 1302static void 1303mac_biba_update_ipq(struct mbuf *fragment, struct label *fragmentlabel, 1304 struct ipq *ipq, struct label *ipqlabel) 1305{ 1306 1307 /* NOOP: we only accept matching labels, so no need to update */ 1308} 1309 1310/* 1311 * Labeling event operations: processes. 1312 */ 1313static void 1314mac_biba_create_cred(struct ucred *cred_parent, struct ucred *cred_child) 1315{ 1316 struct mac_biba *source, *dest; 1317 1318 source = SLOT(&cred_parent->cr_label); 1319 dest = SLOT(&cred_child->cr_label); 1320 1321 mac_biba_copy_single(source, dest); 1322 mac_biba_copy_range(source, dest); 1323} 1324 1325static void 1326mac_biba_create_proc0(struct ucred *cred) 1327{ 1328 struct mac_biba *dest; 1329 1330 dest = SLOT(&cred->cr_label); 1331 1332 mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1333 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1334 MAC_BIBA_TYPE_HIGH, 0, NULL); 1335} 1336 1337static void 1338mac_biba_create_proc1(struct ucred *cred) 1339{ 1340 struct mac_biba *dest; 1341 1342 dest = SLOT(&cred->cr_label); 1343 1344 mac_biba_set_single(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1345 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1346 MAC_BIBA_TYPE_HIGH, 0, NULL); 1347} 1348 1349static void 1350mac_biba_relabel_cred(struct ucred *cred, struct label *newlabel) 1351{ 1352 struct mac_biba *source, *dest; 1353 1354 source = SLOT(newlabel); 1355 dest = SLOT(&cred->cr_label); 1356 1357 mac_biba_copy(source, dest); 1358} 1359 1360/* 1361 * Access control checks. 1362 */ 1363static int 1364mac_biba_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel, 1365 struct ifnet *ifnet, struct label *ifnetlabel) 1366{ 1367 struct mac_biba *a, *b; 1368 1369 if (!mac_biba_enabled) 1370 return (0); 1371 1372 a = SLOT(bpflabel); 1373 b = SLOT(ifnetlabel); 1374 1375 if (mac_biba_equal_single(a, b)) 1376 return (0); 1377 return (EACCES); 1378} 1379 1380static int 1381mac_biba_check_cred_relabel(struct ucred *cred, struct label *newlabel) 1382{ 1383 struct mac_biba *subj, *new; 1384 int error; 1385 1386 subj = SLOT(&cred->cr_label); 1387 new = SLOT(newlabel); 1388 1389 /* 1390 * If there is a Biba label update for the credential, it may 1391 * be an update of the single, range, or both. 1392 */ 1393 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1394 if (error) 1395 return (error); 1396 1397 /* 1398 * If the Biba label is to be changed, authorize as appropriate. 1399 */ 1400 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1401 /* 1402 * If the change request modifies both the Biba label 1403 * single and range, check that the new single will be 1404 * in the new range. 1405 */ 1406 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == 1407 MAC_BIBA_FLAGS_BOTH && 1408 !mac_biba_single_in_range(new, new)) 1409 return (EINVAL); 1410 1411 /* 1412 * To change the Biba single label on a credential, the 1413 * new single label must be in the current range. 1414 */ 1415 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE && 1416 !mac_biba_single_in_range(new, subj)) 1417 return (EPERM); 1418 1419 /* 1420 * To change the Biba range on a credential, the new 1421 * range label must be in the current range. 1422 */ 1423 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1424 !mac_biba_range_in_range(new, subj)) 1425 return (EPERM); 1426 1427 /* 1428 * To have EQUAL in any component of the new credential 1429 * Biba label, the subject must already have EQUAL in 1430 * their label. 1431 */ 1432 if (mac_biba_contains_equal(new)) { 1433 error = mac_biba_subject_privileged(subj); 1434 if (error) 1435 return (error); 1436 } 1437 } 1438 1439 return (0); 1440} 1441 1442static int 1443mac_biba_check_cred_visible(struct ucred *u1, struct ucred *u2) 1444{ 1445 struct mac_biba *subj, *obj; 1446 1447 if (!mac_biba_enabled) 1448 return (0); 1449 1450 subj = SLOT(&u1->cr_label); 1451 obj = SLOT(&u2->cr_label); 1452 1453 /* XXX: range */ 1454 if (!mac_biba_dominate_single(obj, subj)) 1455 return (ESRCH); 1456 1457 return (0); 1458} 1459 1460static int 1461mac_biba_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet, 1462 struct label *ifnetlabel, struct label *newlabel) 1463{ 1464 struct mac_biba *subj, *new; 1465 int error; 1466 1467 subj = SLOT(&cred->cr_label); 1468 new = SLOT(newlabel); 1469 1470 /* 1471 * If there is a Biba label update for the interface, it may 1472 * be an update of the single, range, or both. 1473 */ 1474 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1475 if (error) 1476 return (error); 1477 1478 /* 1479 * Relabling network interfaces requires Biba privilege. 1480 */ 1481 error = mac_biba_subject_privileged(subj); 1482 if (error) 1483 return (error); 1484 1485 /* 1486 * If the Biba label is to be changed, authorize as appropriate. 1487 */ 1488 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1489 /* 1490 * Rely on the traditional superuser status for the Biba 1491 * interface relabel requirements. XXXMAC: This will go 1492 * away. 1493 */ 1494 error = suser_cred(cred, 0); 1495 if (error) 1496 return (EPERM); 1497 1498 /* 1499 * XXXMAC: Additional consistency tests regarding the single 1500 * and the range of the new label might be performed here. 1501 */ 1502 } 1503 1504 return (0); 1505} 1506 1507static int 1508mac_biba_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel, 1509 struct mbuf *m, struct label *mbuflabel) 1510{ 1511 struct mac_biba *p, *i; 1512 1513 if (!mac_biba_enabled) 1514 return (0); 1515 1516 p = SLOT(mbuflabel); 1517 i = SLOT(ifnetlabel); 1518 1519 return (mac_biba_single_in_range(p, i) ? 0 : EACCES); 1520} 1521 1522static int 1523mac_biba_check_kld_load(struct ucred *cred, struct vnode *vp, 1524 struct label *label) 1525{ 1526 struct mac_biba *subj, *obj; 1527 int error; 1528 1529 if (!mac_biba_enabled) 1530 return (0); 1531 1532 subj = SLOT(&cred->cr_label); 1533 1534 error = mac_biba_subject_privileged(subj); 1535 if (error) 1536 return (error); 1537 1538 obj = SLOT(label); 1539 if (!mac_biba_high_single(obj)) 1540 return (EACCES); 1541 1542 return (0); 1543} 1544 1545 1546static int 1547mac_biba_check_kld_unload(struct ucred *cred) 1548{ 1549 struct mac_biba *subj; 1550 1551 if (!mac_biba_enabled) 1552 return (0); 1553 1554 subj = SLOT(&cred->cr_label); 1555 1556 return (mac_biba_subject_privileged(subj)); 1557} 1558 1559static int 1560mac_biba_check_mount_stat(struct ucred *cred, struct mount *mp, 1561 struct label *mntlabel) 1562{ 1563 struct mac_biba *subj, *obj; 1564 1565 if (!mac_biba_enabled) 1566 return (0); 1567 1568 subj = SLOT(&cred->cr_label); 1569 obj = SLOT(mntlabel); 1570 1571 if (!mac_biba_dominate_single(obj, subj)) 1572 return (EACCES); 1573 1574 return (0); 1575} 1576 1577static int 1578mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, 1579 struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data) 1580{ 1581 1582 if(!mac_biba_enabled) 1583 return (0); 1584 1585 /* XXX: This will be implemented soon... */ 1586 1587 return (0); 1588} 1589 1590static int 1591mac_biba_check_pipe_poll(struct ucred *cred, struct pipe *pipe, 1592 struct label *pipelabel) 1593{ 1594 struct mac_biba *subj, *obj; 1595 1596 if (!mac_biba_enabled) 1597 return (0); 1598 1599 subj = SLOT(&cred->cr_label); 1600 obj = SLOT((pipelabel)); 1601 1602 if (!mac_biba_dominate_single(obj, subj)) 1603 return (EACCES); 1604 1605 return (0); 1606} 1607 1608static int 1609mac_biba_check_pipe_read(struct ucred *cred, struct pipe *pipe, 1610 struct label *pipelabel) 1611{ 1612 struct mac_biba *subj, *obj; 1613 1614 if (!mac_biba_enabled) 1615 return (0); 1616 1617 subj = SLOT(&cred->cr_label); 1618 obj = SLOT((pipelabel)); 1619 1620 if (!mac_biba_dominate_single(obj, subj)) 1621 return (EACCES); 1622 1623 return (0); 1624} 1625 1626static int 1627mac_biba_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 1628 struct label *pipelabel, struct label *newlabel) 1629{ 1630 struct mac_biba *subj, *obj, *new; 1631 int error; 1632 1633 new = SLOT(newlabel); 1634 subj = SLOT(&cred->cr_label); 1635 obj = SLOT(pipelabel); 1636 1637 /* 1638 * If there is a Biba label update for a pipe, it must be a 1639 * single update. 1640 */ 1641 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 1642 if (error) 1643 return (error); 1644 1645 /* 1646 * To perform a relabel of a pipe (Biba label or not), Biba must 1647 * authorize the relabel. 1648 */ 1649 if (!mac_biba_single_in_range(obj, subj)) 1650 return (EPERM); 1651 1652 /* 1653 * If the Biba label is to be changed, authorize as appropriate. 1654 */ 1655 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 1656 /* 1657 * To change the Biba label on a pipe, the new pipe label 1658 * must be in the subject range. 1659 */ 1660 if (!mac_biba_single_in_range(new, subj)) 1661 return (EPERM); 1662 1663 /* 1664 * To change the Biba label on a pipe to be EQUAL, the 1665 * subject must have appropriate privilege. 1666 */ 1667 if (mac_biba_contains_equal(new)) { 1668 error = mac_biba_subject_privileged(subj); 1669 if (error) 1670 return (error); 1671 } 1672 } 1673 1674 return (0); 1675} 1676 1677static int 1678mac_biba_check_pipe_stat(struct ucred *cred, struct pipe *pipe, 1679 struct label *pipelabel) 1680{ 1681 struct mac_biba *subj, *obj; 1682 1683 if (!mac_biba_enabled) 1684 return (0); 1685 1686 subj = SLOT(&cred->cr_label); 1687 obj = SLOT((pipelabel)); 1688 1689 if (!mac_biba_dominate_single(obj, subj)) 1690 return (EACCES); 1691 1692 return (0); 1693} 1694 1695static int 1696mac_biba_check_pipe_write(struct ucred *cred, struct pipe *pipe, 1697 struct label *pipelabel) 1698{ 1699 struct mac_biba *subj, *obj; 1700 1701 if (!mac_biba_enabled) 1702 return (0); 1703 1704 subj = SLOT(&cred->cr_label); 1705 obj = SLOT((pipelabel)); 1706 1707 if (!mac_biba_dominate_single(subj, obj)) 1708 return (EACCES); 1709 1710 return (0); 1711} 1712 1713static int 1714mac_biba_check_proc_debug(struct ucred *cred, struct proc *proc) 1715{ 1716 struct mac_biba *subj, *obj; 1717 1718 if (!mac_biba_enabled) 1719 return (0); 1720 1721 subj = SLOT(&cred->cr_label); 1722 obj = SLOT(&proc->p_ucred->cr_label); 1723 1724 /* XXX: range checks */ 1725 if (!mac_biba_dominate_single(obj, subj)) 1726 return (ESRCH); 1727 if (!mac_biba_dominate_single(subj, obj)) 1728 return (EACCES); 1729 1730 return (0); 1731} 1732 1733static int 1734mac_biba_check_proc_sched(struct ucred *cred, struct proc *proc) 1735{ 1736 struct mac_biba *subj, *obj; 1737 1738 if (!mac_biba_enabled) 1739 return (0); 1740 1741 subj = SLOT(&cred->cr_label); 1742 obj = SLOT(&proc->p_ucred->cr_label); 1743 1744 /* XXX: range checks */ 1745 if (!mac_biba_dominate_single(obj, subj)) 1746 return (ESRCH); 1747 if (!mac_biba_dominate_single(subj, obj)) 1748 return (EACCES); 1749 1750 return (0); 1751} 1752 1753static int 1754mac_biba_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 1755{ 1756 struct mac_biba *subj, *obj; 1757 1758 if (!mac_biba_enabled) 1759 return (0); 1760 1761 subj = SLOT(&cred->cr_label); 1762 obj = SLOT(&proc->p_ucred->cr_label); 1763 1764 /* XXX: range checks */ 1765 if (!mac_biba_dominate_single(obj, subj)) 1766 return (ESRCH); 1767 if (!mac_biba_dominate_single(subj, obj)) 1768 return (EACCES); 1769 1770 return (0); 1771} 1772 1773static int 1774mac_biba_check_socket_deliver(struct socket *so, struct label *socketlabel, 1775 struct mbuf *m, struct label *mbuflabel) 1776{ 1777 struct mac_biba *p, *s; 1778 1779 if (!mac_biba_enabled) 1780 return (0); 1781 1782 p = SLOT(mbuflabel); 1783 s = SLOT(socketlabel); 1784 1785 return (mac_biba_equal_single(p, s) ? 0 : EACCES); 1786} 1787 1788static int 1789mac_biba_check_socket_relabel(struct ucred *cred, struct socket *so, 1790 struct label *socketlabel, struct label *newlabel) 1791{ 1792 struct mac_biba *subj, *obj, *new; 1793 int error; 1794 1795 new = SLOT(newlabel); 1796 subj = SLOT(&cred->cr_label); 1797 obj = SLOT(socketlabel); 1798 1799 /* 1800 * If there is a Biba label update for the socket, it may be 1801 * an update of single. 1802 */ 1803 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 1804 if (error) 1805 return (error); 1806 1807 /* 1808 * To relabel a socket, the old socket single must be in the subject 1809 * range. 1810 */ 1811 if (!mac_biba_single_in_range(obj, subj)) 1812 return (EPERM); 1813 1814 /* 1815 * If the Biba label is to be changed, authorize as appropriate. 1816 */ 1817 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 1818 /* 1819 * To relabel a socket, the new socket single must be in 1820 * the subject range. 1821 */ 1822 if (!mac_biba_single_in_range(new, subj)) 1823 return (EPERM); 1824 1825 /* 1826 * To change the Biba label on the socket to contain EQUAL, 1827 * the subject must have appropriate privilege. 1828 */ 1829 if (mac_biba_contains_equal(new)) { 1830 error = mac_biba_subject_privileged(subj); 1831 if (error) 1832 return (error); 1833 } 1834 } 1835 1836 return (0); 1837} 1838 1839static int 1840mac_biba_check_socket_visible(struct ucred *cred, struct socket *socket, 1841 struct label *socketlabel) 1842{ 1843 struct mac_biba *subj, *obj; 1844 1845 if (!mac_biba_enabled) 1846 return (0); 1847 1848 subj = SLOT(&cred->cr_label); 1849 obj = SLOT(socketlabel); 1850 1851 if (!mac_biba_dominate_single(obj, subj)) 1852 return (ENOENT); 1853 1854 return (0); 1855} 1856 1857static int 1858mac_biba_check_sysarch_ioperm(struct ucred *cred) 1859{ 1860 struct mac_biba *subj; 1861 int error; 1862 1863 if (!mac_biba_enabled) 1864 return (0); 1865 1866 subj = SLOT(&cred->cr_label); 1867 1868 error = mac_biba_subject_privileged(subj); 1869 if (error) 1870 return (error); 1871 1872 return (0); 1873} 1874 1875static int 1876mac_biba_check_system_acct(struct ucred *cred, struct vnode *vp, 1877 struct label *label) 1878{ 1879 struct mac_biba *subj, *obj; 1880 int error; 1881 1882 if (!mac_biba_enabled) 1883 return (0); 1884 1885 subj = SLOT(&cred->cr_label); 1886 1887 error = mac_biba_subject_privileged(subj); 1888 if (error) 1889 return (error); 1890 1891 if (label == NULL) 1892 return (0); 1893 1894 obj = SLOT(label); 1895 if (!mac_biba_high_single(obj)) 1896 return (EACCES); 1897 1898 return (0); 1899} 1900 1901static int 1902mac_biba_check_system_settime(struct ucred *cred) 1903{ 1904 struct mac_biba *subj; 1905 int error; 1906 1907 if (!mac_biba_enabled) 1908 return (0); 1909 1910 subj = SLOT(&cred->cr_label); 1911 1912 error = mac_biba_subject_privileged(subj); 1913 if (error) 1914 return (error); 1915 1916 return (0); 1917} 1918 1919static int 1920mac_biba_check_system_swapon(struct ucred *cred, struct vnode *vp, 1921 struct label *label) 1922{ 1923 struct mac_biba *subj, *obj; 1924 int error; 1925 1926 if (!mac_biba_enabled) 1927 return (0); 1928 1929 subj = SLOT(&cred->cr_label); 1930 obj = SLOT(label); 1931 1932 error = mac_biba_subject_privileged(subj); 1933 if (error) 1934 return (error); 1935 1936 if (!mac_biba_high_single(obj)) 1937 return (EACCES); 1938 1939 return (0); 1940} 1941 1942static int 1943mac_biba_check_system_swapoff(struct ucred *cred, struct vnode *vp, 1944 struct label *label) 1945{ 1946 struct mac_biba *subj, *obj; 1947 int error; 1948 1949 if (!mac_biba_enabled) 1950 return (0); 1951 1952 subj = SLOT(&cred->cr_label); 1953 obj = SLOT(label); 1954 1955 error = mac_biba_subject_privileged(subj); 1956 if (error) 1957 return (error); 1958 1959 return (0); 1960} 1961 1962static int 1963mac_biba_check_system_sysctl(struct ucred *cred, int *name, u_int namelen, 1964 void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen) 1965{ 1966 struct mac_biba *subj; 1967 int error; 1968 1969 if (!mac_biba_enabled) 1970 return (0); 1971 1972 subj = SLOT(&cred->cr_label); 1973 1974 /* 1975 * In general, treat sysctl variables as biba/high, but also 1976 * require privilege to change them, since they are a 1977 * communications channel between grades. Exempt MIB 1978 * queries from this due to undocmented sysctl magic. 1979 * XXXMAC: This probably requires some more review. 1980 */ 1981 if (new != NULL) { 1982 if (namelen > 0 && name[0] == 0) 1983 return (0); 1984 1985 if (!mac_biba_subject_dominate_high(subj)) 1986 return (EACCES); 1987 1988 error = mac_biba_subject_privileged(subj); 1989 if (error) 1990 return (error); 1991 } 1992 1993 return (0); 1994} 1995 1996static int 1997mac_biba_check_vnode_chdir(struct ucred *cred, struct vnode *dvp, 1998 struct label *dlabel) 1999{ 2000 struct mac_biba *subj, *obj; 2001 2002 if (!mac_biba_enabled) 2003 return (0); 2004 2005 subj = SLOT(&cred->cr_label); 2006 obj = SLOT(dlabel); 2007 2008 if (!mac_biba_dominate_single(obj, subj)) 2009 return (EACCES); 2010 2011 return (0); 2012} 2013 2014static int 2015mac_biba_check_vnode_chroot(struct ucred *cred, struct vnode *dvp, 2016 struct label *dlabel) 2017{ 2018 struct mac_biba *subj, *obj; 2019 2020 if (!mac_biba_enabled) 2021 return (0); 2022 2023 subj = SLOT(&cred->cr_label); 2024 obj = SLOT(dlabel); 2025 2026 if (!mac_biba_dominate_single(obj, subj)) 2027 return (EACCES); 2028 2029 return (0); 2030} 2031 2032static int 2033mac_biba_check_vnode_create(struct ucred *cred, struct vnode *dvp, 2034 struct label *dlabel, struct componentname *cnp, struct vattr *vap) 2035{ 2036 struct mac_biba *subj, *obj; 2037 2038 if (!mac_biba_enabled) 2039 return (0); 2040 2041 subj = SLOT(&cred->cr_label); 2042 obj = SLOT(dlabel); 2043 2044 if (!mac_biba_dominate_single(subj, obj)) 2045 return (EACCES); 2046 2047 return (0); 2048} 2049 2050static int 2051mac_biba_check_vnode_delete(struct ucred *cred, struct vnode *dvp, 2052 struct label *dlabel, struct vnode *vp, struct label *label, 2053 struct componentname *cnp) 2054{ 2055 struct mac_biba *subj, *obj; 2056 2057 if (!mac_biba_enabled) 2058 return (0); 2059 2060 subj = SLOT(&cred->cr_label); 2061 obj = SLOT(dlabel); 2062 2063 if (!mac_biba_dominate_single(subj, obj)) 2064 return (EACCES); 2065 2066 obj = SLOT(label); 2067 2068 if (!mac_biba_dominate_single(subj, obj)) 2069 return (EACCES); 2070 2071 return (0); 2072} 2073 2074static int 2075mac_biba_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 2076 struct label *label, acl_type_t type) 2077{ 2078 struct mac_biba *subj, *obj; 2079 2080 if (!mac_biba_enabled) 2081 return (0); 2082 2083 subj = SLOT(&cred->cr_label); 2084 obj = SLOT(label); 2085 2086 if (!mac_biba_dominate_single(subj, obj)) 2087 return (EACCES); 2088 2089 return (0); 2090} 2091 2092static int 2093mac_biba_check_vnode_exec(struct ucred *cred, struct vnode *vp, 2094 struct label *label, struct image_params *imgp, 2095 struct label *execlabel) 2096{ 2097 struct mac_biba *subj, *obj, *exec; 2098 int error; 2099 2100 if (execlabel != NULL) { 2101 /* 2102 * We currently don't permit labels to be changed at 2103 * exec-time as part of Biba, so disallow non-NULL 2104 * Biba label elements in the execlabel. 2105 */ 2106 exec = SLOT(execlabel); 2107 error = biba_atmostflags(exec, 0); 2108 if (error) 2109 return (error); 2110 } 2111 2112 if (!mac_biba_enabled) 2113 return (0); 2114 2115 subj = SLOT(&cred->cr_label); 2116 obj = SLOT(label); 2117 2118 if (!mac_biba_dominate_single(obj, subj)) 2119 return (EACCES); 2120 2121 return (0); 2122} 2123 2124static int 2125mac_biba_check_vnode_getacl(struct ucred *cred, struct vnode *vp, 2126 struct label *label, acl_type_t type) 2127{ 2128 struct mac_biba *subj, *obj; 2129 2130 if (!mac_biba_enabled) 2131 return (0); 2132 2133 subj = SLOT(&cred->cr_label); 2134 obj = SLOT(label); 2135 2136 if (!mac_biba_dominate_single(obj, subj)) 2137 return (EACCES); 2138 2139 return (0); 2140} 2141 2142static int 2143mac_biba_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 2144 struct label *label, int attrnamespace, const char *name, struct uio *uio) 2145{ 2146 struct mac_biba *subj, *obj; 2147 2148 if (!mac_biba_enabled) 2149 return (0); 2150 2151 subj = SLOT(&cred->cr_label); 2152 obj = SLOT(label); 2153 2154 if (!mac_biba_dominate_single(obj, subj)) 2155 return (EACCES); 2156 2157 return (0); 2158} 2159 2160static int 2161mac_biba_check_vnode_link(struct ucred *cred, struct vnode *dvp, 2162 struct label *dlabel, struct vnode *vp, struct label *label, 2163 struct componentname *cnp) 2164{ 2165 struct mac_biba *subj, *obj; 2166 2167 if (!mac_biba_enabled) 2168 return (0); 2169 2170 subj = SLOT(&cred->cr_label); 2171 obj = SLOT(dlabel); 2172 2173 if (!mac_biba_dominate_single(subj, obj)) 2174 return (EACCES); 2175 2176 obj = SLOT(label); 2177 2178 if (!mac_biba_dominate_single(subj, obj)) 2179 return (EACCES); 2180 2181 return (0); 2182} 2183 2184static int 2185mac_biba_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 2186 struct label *dlabel, struct componentname *cnp) 2187{ 2188 struct mac_biba *subj, *obj; 2189 2190 if (!mac_biba_enabled) 2191 return (0); 2192 2193 subj = SLOT(&cred->cr_label); 2194 obj = SLOT(dlabel); 2195 2196 if (!mac_biba_dominate_single(obj, subj)) 2197 return (EACCES); 2198 2199 return (0); 2200} 2201 2202static int 2203mac_biba_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 2204 struct label *label, int prot) 2205{ 2206 struct mac_biba *subj, *obj; 2207 2208 /* 2209 * Rely on the use of open()-time protections to handle 2210 * non-revocation cases. 2211 */ 2212 if (!mac_biba_enabled || !revocation_enabled) 2213 return (0); 2214 2215 subj = SLOT(&cred->cr_label); 2216 obj = SLOT(label); 2217 2218 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2219 if (!mac_biba_dominate_single(obj, subj)) 2220 return (EACCES); 2221 } 2222 if (prot & VM_PROT_WRITE) { 2223 if (!mac_biba_dominate_single(subj, obj)) 2224 return (EACCES); 2225 } 2226 2227 return (0); 2228} 2229 2230static int 2231mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp, 2232 struct label *vnodelabel, int acc_mode) 2233{ 2234 struct mac_biba *subj, *obj; 2235 2236 if (!mac_biba_enabled) 2237 return (0); 2238 2239 subj = SLOT(&cred->cr_label); 2240 obj = SLOT(vnodelabel); 2241 2242 /* XXX privilege override for admin? */ 2243 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2244 if (!mac_biba_dominate_single(obj, subj)) 2245 return (EACCES); 2246 } 2247 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2248 if (!mac_biba_dominate_single(subj, obj)) 2249 return (EACCES); 2250 } 2251 2252 return (0); 2253} 2254 2255static int 2256mac_biba_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 2257 struct vnode *vp, struct label *label) 2258{ 2259 struct mac_biba *subj, *obj; 2260 2261 if (!mac_biba_enabled || !revocation_enabled) 2262 return (0); 2263 2264 subj = SLOT(&active_cred->cr_label); 2265 obj = SLOT(label); 2266 2267 if (!mac_biba_dominate_single(obj, subj)) 2268 return (EACCES); 2269 2270 return (0); 2271} 2272 2273static int 2274mac_biba_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 2275 struct vnode *vp, struct label *label) 2276{ 2277 struct mac_biba *subj, *obj; 2278 2279 if (!mac_biba_enabled || !revocation_enabled) 2280 return (0); 2281 2282 subj = SLOT(&active_cred->cr_label); 2283 obj = SLOT(label); 2284 2285 if (!mac_biba_dominate_single(obj, subj)) 2286 return (EACCES); 2287 2288 return (0); 2289} 2290 2291static int 2292mac_biba_check_vnode_readdir(struct ucred *cred, struct vnode *dvp, 2293 struct label *dlabel) 2294{ 2295 struct mac_biba *subj, *obj; 2296 2297 if (!mac_biba_enabled) 2298 return (0); 2299 2300 subj = SLOT(&cred->cr_label); 2301 obj = SLOT(dlabel); 2302 2303 if (!mac_biba_dominate_single(obj, subj)) 2304 return (EACCES); 2305 2306 return (0); 2307} 2308 2309static int 2310mac_biba_check_vnode_readlink(struct ucred *cred, struct vnode *vp, 2311 struct label *label) 2312{ 2313 struct mac_biba *subj, *obj; 2314 2315 if (!mac_biba_enabled) 2316 return (0); 2317 2318 subj = SLOT(&cred->cr_label); 2319 obj = SLOT(label); 2320 2321 if (!mac_biba_dominate_single(obj, subj)) 2322 return (EACCES); 2323 2324 return (0); 2325} 2326 2327static int 2328mac_biba_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 2329 struct label *vnodelabel, struct label *newlabel) 2330{ 2331 struct mac_biba *old, *new, *subj; 2332 int error; 2333 2334 old = SLOT(vnodelabel); 2335 new = SLOT(newlabel); 2336 subj = SLOT(&cred->cr_label); 2337 2338 /* 2339 * If there is a Biba label update for the vnode, it must be a 2340 * single label. 2341 */ 2342 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 2343 if (error) 2344 return (error); 2345 2346 /* 2347 * To perform a relabel of the vnode (Biba label or not), Biba must 2348 * authorize the relabel. 2349 */ 2350 if (!mac_biba_single_in_range(old, subj)) 2351 return (EPERM); 2352 2353 /* 2354 * If the Biba label is to be changed, authorize as appropriate. 2355 */ 2356 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 2357 /* 2358 * To change the Biba label on a vnode, the new vnode label 2359 * must be in the subject range. 2360 */ 2361 if (!mac_biba_single_in_range(new, subj)) 2362 return (EPERM); 2363 2364 /* 2365 * To change the Biba label on the vnode to be EQUAL, 2366 * the subject must have appropriate privilege. 2367 */ 2368 if (mac_biba_contains_equal(new)) { 2369 error = mac_biba_subject_privileged(subj); 2370 if (error) 2371 return (error); 2372 } 2373 } 2374 2375 return (0); 2376} 2377 2378static int 2379mac_biba_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 2380 struct label *dlabel, struct vnode *vp, struct label *label, 2381 struct componentname *cnp) 2382{ 2383 struct mac_biba *subj, *obj; 2384 2385 if (!mac_biba_enabled) 2386 return (0); 2387 2388 subj = SLOT(&cred->cr_label); 2389 obj = SLOT(dlabel); 2390 2391 if (!mac_biba_dominate_single(subj, obj)) 2392 return (EACCES); 2393 2394 obj = SLOT(label); 2395 2396 if (!mac_biba_dominate_single(subj, obj)) 2397 return (EACCES); 2398 2399 return (0); 2400} 2401 2402static int 2403mac_biba_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 2404 struct label *dlabel, struct vnode *vp, struct label *label, int samedir, 2405 struct componentname *cnp) 2406{ 2407 struct mac_biba *subj, *obj; 2408 2409 if (!mac_biba_enabled) 2410 return (0); 2411 2412 subj = SLOT(&cred->cr_label); 2413 obj = SLOT(dlabel); 2414 2415 if (!mac_biba_dominate_single(subj, obj)) 2416 return (EACCES); 2417 2418 if (vp != NULL) { 2419 obj = SLOT(label); 2420 2421 if (!mac_biba_dominate_single(subj, obj)) 2422 return (EACCES); 2423 } 2424 2425 return (0); 2426} 2427 2428static int 2429mac_biba_check_vnode_revoke(struct ucred *cred, struct vnode *vp, 2430 struct label *label) 2431{ 2432 struct mac_biba *subj, *obj; 2433 2434 if (!mac_biba_enabled) 2435 return (0); 2436 2437 subj = SLOT(&cred->cr_label); 2438 obj = SLOT(label); 2439 2440 if (!mac_biba_dominate_single(subj, obj)) 2441 return (EACCES); 2442 2443 return (0); 2444} 2445 2446static int 2447mac_biba_check_vnode_setacl(struct ucred *cred, struct vnode *vp, 2448 struct label *label, acl_type_t type, struct acl *acl) 2449{ 2450 struct mac_biba *subj, *obj; 2451 2452 if (!mac_biba_enabled) 2453 return (0); 2454 2455 subj = SLOT(&cred->cr_label); 2456 obj = SLOT(label); 2457 2458 if (!mac_biba_dominate_single(subj, obj)) 2459 return (EACCES); 2460 2461 return (0); 2462} 2463 2464static int 2465mac_biba_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 2466 struct label *vnodelabel, int attrnamespace, const char *name, 2467 struct uio *uio) 2468{ 2469 struct mac_biba *subj, *obj; 2470 2471 if (!mac_biba_enabled) 2472 return (0); 2473 2474 subj = SLOT(&cred->cr_label); 2475 obj = SLOT(vnodelabel); 2476 2477 if (!mac_biba_dominate_single(subj, obj)) 2478 return (EACCES); 2479 2480 /* XXX: protect the MAC EA in a special way? */ 2481 2482 return (0); 2483} 2484 2485static int 2486mac_biba_check_vnode_setflags(struct ucred *cred, struct vnode *vp, 2487 struct label *vnodelabel, u_long flags) 2488{ 2489 struct mac_biba *subj, *obj; 2490 2491 if (!mac_biba_enabled) 2492 return (0); 2493 2494 subj = SLOT(&cred->cr_label); 2495 obj = SLOT(vnodelabel); 2496 2497 if (!mac_biba_dominate_single(subj, obj)) 2498 return (EACCES); 2499 2500 return (0); 2501} 2502 2503static int 2504mac_biba_check_vnode_setmode(struct ucred *cred, struct vnode *vp, 2505 struct label *vnodelabel, mode_t mode) 2506{ 2507 struct mac_biba *subj, *obj; 2508 2509 if (!mac_biba_enabled) 2510 return (0); 2511 2512 subj = SLOT(&cred->cr_label); 2513 obj = SLOT(vnodelabel); 2514 2515 if (!mac_biba_dominate_single(subj, obj)) 2516 return (EACCES); 2517 2518 return (0); 2519} 2520 2521static int 2522mac_biba_check_vnode_setowner(struct ucred *cred, struct vnode *vp, 2523 struct label *vnodelabel, uid_t uid, gid_t gid) 2524{ 2525 struct mac_biba *subj, *obj; 2526 2527 if (!mac_biba_enabled) 2528 return (0); 2529 2530 subj = SLOT(&cred->cr_label); 2531 obj = SLOT(vnodelabel); 2532 2533 if (!mac_biba_dominate_single(subj, obj)) 2534 return (EACCES); 2535 2536 return (0); 2537} 2538 2539static int 2540mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 2541 struct label *vnodelabel, struct timespec atime, struct timespec mtime) 2542{ 2543 struct mac_biba *subj, *obj; 2544 2545 if (!mac_biba_enabled) 2546 return (0); 2547 2548 subj = SLOT(&cred->cr_label); 2549 obj = SLOT(vnodelabel); 2550 2551 if (!mac_biba_dominate_single(subj, obj)) 2552 return (EACCES); 2553 2554 return (0); 2555} 2556 2557static int 2558mac_biba_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2559 struct vnode *vp, struct label *vnodelabel) 2560{ 2561 struct mac_biba *subj, *obj; 2562 2563 if (!mac_biba_enabled) 2564 return (0); 2565 2566 subj = SLOT(&active_cred->cr_label); 2567 obj = SLOT(vnodelabel); 2568 2569 if (!mac_biba_dominate_single(obj, subj)) 2570 return (EACCES); 2571 2572 return (0); 2573} 2574 2575static int 2576mac_biba_check_vnode_write(struct ucred *active_cred, 2577 struct ucred *file_cred, struct vnode *vp, struct label *label) 2578{ 2579 struct mac_biba *subj, *obj; 2580 2581 if (!mac_biba_enabled || !revocation_enabled) 2582 return (0); 2583 2584 subj = SLOT(&active_cred->cr_label); 2585 obj = SLOT(label); 2586 2587 if (!mac_biba_dominate_single(subj, obj)) 2588 return (EACCES); 2589 2590 return (0); 2591} 2592 2593static struct mac_policy_ops mac_biba_ops = 2594{ 2595 .mpo_destroy = mac_biba_destroy, 2596 .mpo_init = mac_biba_init, 2597 .mpo_init_bpfdesc_label = mac_biba_init_label, 2598 .mpo_init_cred_label = mac_biba_init_label, 2599 .mpo_init_devfsdirent_label = mac_biba_init_label, 2600 .mpo_init_ifnet_label = mac_biba_init_label, 2601 .mpo_init_ipq_label = mac_biba_init_label_waitcheck, 2602 .mpo_init_mbuf_label = mac_biba_init_label_waitcheck, 2603 .mpo_init_mount_label = mac_biba_init_label, 2604 .mpo_init_mount_fs_label = mac_biba_init_label, 2605 .mpo_init_pipe_label = mac_biba_init_label, 2606 .mpo_init_socket_label = mac_biba_init_label_waitcheck, 2607 .mpo_init_socket_peer_label = mac_biba_init_label_waitcheck, 2608 .mpo_init_vnode_label = mac_biba_init_label, 2609 .mpo_destroy_bpfdesc_label = mac_biba_destroy_label, 2610 .mpo_destroy_cred_label = mac_biba_destroy_label, 2611 .mpo_destroy_devfsdirent_label = mac_biba_destroy_label, 2612 .mpo_destroy_ifnet_label = mac_biba_destroy_label, 2613 .mpo_destroy_ipq_label = mac_biba_destroy_label, 2614 .mpo_destroy_mbuf_label = mac_biba_destroy_label, 2615 .mpo_destroy_mount_label = mac_biba_destroy_label, 2616 .mpo_destroy_mount_fs_label = mac_biba_destroy_label, 2617 .mpo_destroy_pipe_label = mac_biba_destroy_label, 2618 .mpo_destroy_socket_label = mac_biba_destroy_label, 2619 .mpo_destroy_socket_peer_label = mac_biba_destroy_label, 2620 .mpo_destroy_vnode_label = mac_biba_destroy_label, 2621 .mpo_copy_mbuf_label = mac_biba_copy_label, 2622 .mpo_copy_pipe_label = mac_biba_copy_label, 2623 .mpo_copy_vnode_label = mac_biba_copy_label, 2624 .mpo_externalize_cred_label = mac_biba_externalize_label, 2625 .mpo_externalize_ifnet_label = mac_biba_externalize_label, 2626 .mpo_externalize_pipe_label = mac_biba_externalize_label, 2627 .mpo_externalize_socket_label = mac_biba_externalize_label, 2628 .mpo_externalize_socket_peer_label = mac_biba_externalize_label, 2629 .mpo_externalize_vnode_label = mac_biba_externalize_label, 2630 .mpo_internalize_cred_label = mac_biba_internalize_label, 2631 .mpo_internalize_ifnet_label = mac_biba_internalize_label, 2632 .mpo_internalize_pipe_label = mac_biba_internalize_label, 2633 .mpo_internalize_socket_label = mac_biba_internalize_label, 2634 .mpo_internalize_vnode_label = mac_biba_internalize_label, 2635 .mpo_create_devfs_device = mac_biba_create_devfs_device, 2636 .mpo_create_devfs_directory = mac_biba_create_devfs_directory, 2637 .mpo_create_devfs_symlink = mac_biba_create_devfs_symlink, 2638 .mpo_create_mount = mac_biba_create_mount, 2639 .mpo_create_root_mount = mac_biba_create_root_mount, 2640 .mpo_relabel_vnode = mac_biba_relabel_vnode, 2641 .mpo_update_devfsdirent = mac_biba_update_devfsdirent, 2642 .mpo_associate_vnode_devfs = mac_biba_associate_vnode_devfs, 2643 .mpo_associate_vnode_extattr = mac_biba_associate_vnode_extattr, 2644 .mpo_associate_vnode_singlelabel = mac_biba_associate_vnode_singlelabel, 2645 .mpo_create_vnode_extattr = mac_biba_create_vnode_extattr, 2646 .mpo_setlabel_vnode_extattr = mac_biba_setlabel_vnode_extattr, 2647 .mpo_create_mbuf_from_socket = mac_biba_create_mbuf_from_socket, 2648 .mpo_create_pipe = mac_biba_create_pipe, 2649 .mpo_create_socket = mac_biba_create_socket, 2650 .mpo_create_socket_from_socket = mac_biba_create_socket_from_socket, 2651 .mpo_relabel_pipe = mac_biba_relabel_pipe, 2652 .mpo_relabel_socket = mac_biba_relabel_socket, 2653 .mpo_set_socket_peer_from_mbuf = mac_biba_set_socket_peer_from_mbuf, 2654 .mpo_set_socket_peer_from_socket = mac_biba_set_socket_peer_from_socket, 2655 .mpo_create_bpfdesc = mac_biba_create_bpfdesc, 2656 .mpo_create_datagram_from_ipq = mac_biba_create_datagram_from_ipq, 2657 .mpo_create_fragment = mac_biba_create_fragment, 2658 .mpo_create_ifnet = mac_biba_create_ifnet, 2659 .mpo_create_ipq = mac_biba_create_ipq, 2660 .mpo_create_mbuf_from_mbuf = mac_biba_create_mbuf_from_mbuf, 2661 .mpo_create_mbuf_linklayer = mac_biba_create_mbuf_linklayer, 2662 .mpo_create_mbuf_from_bpfdesc = mac_biba_create_mbuf_from_bpfdesc, 2663 .mpo_create_mbuf_from_ifnet = mac_biba_create_mbuf_from_ifnet, 2664 .mpo_create_mbuf_multicast_encap = mac_biba_create_mbuf_multicast_encap, 2665 .mpo_create_mbuf_netlayer = mac_biba_create_mbuf_netlayer, 2666 .mpo_fragment_match = mac_biba_fragment_match, 2667 .mpo_relabel_ifnet = mac_biba_relabel_ifnet, 2668 .mpo_update_ipq = mac_biba_update_ipq, 2669 .mpo_create_cred = mac_biba_create_cred, 2670 .mpo_create_proc0 = mac_biba_create_proc0, 2671 .mpo_create_proc1 = mac_biba_create_proc1, 2672 .mpo_relabel_cred = mac_biba_relabel_cred, 2673 .mpo_check_bpfdesc_receive = mac_biba_check_bpfdesc_receive, 2674 .mpo_check_cred_relabel = mac_biba_check_cred_relabel, 2675 .mpo_check_cred_visible = mac_biba_check_cred_visible, 2676 .mpo_check_ifnet_relabel = mac_biba_check_ifnet_relabel, 2677 .mpo_check_ifnet_transmit = mac_biba_check_ifnet_transmit, 2678 .mpo_check_kld_load = mac_biba_check_kld_load, 2679 .mpo_check_kld_unload = mac_biba_check_kld_unload, 2680 .mpo_check_mount_stat = mac_biba_check_mount_stat, 2681 .mpo_check_pipe_ioctl = mac_biba_check_pipe_ioctl, 2682 .mpo_check_pipe_poll = mac_biba_check_pipe_poll, 2683 .mpo_check_pipe_read = mac_biba_check_pipe_read, 2684 .mpo_check_pipe_relabel = mac_biba_check_pipe_relabel, 2685 .mpo_check_pipe_stat = mac_biba_check_pipe_stat, 2686 .mpo_check_pipe_write = mac_biba_check_pipe_write, 2687 .mpo_check_proc_debug = mac_biba_check_proc_debug, 2688 .mpo_check_proc_sched = mac_biba_check_proc_sched, 2689 .mpo_check_proc_signal = mac_biba_check_proc_signal, 2690 .mpo_check_socket_deliver = mac_biba_check_socket_deliver, 2691 .mpo_check_socket_relabel = mac_biba_check_socket_relabel, 2692 .mpo_check_socket_visible = mac_biba_check_socket_visible, 2693 .mpo_check_sysarch_ioperm = mac_biba_check_sysarch_ioperm, 2694 .mpo_check_system_acct = mac_biba_check_system_acct, 2695 .mpo_check_system_settime = mac_biba_check_system_settime, 2696 .mpo_check_system_swapon = mac_biba_check_system_swapon, 2697 .mpo_check_system_swapoff = mac_biba_check_system_swapoff, 2698 .mpo_check_system_sysctl = mac_biba_check_system_sysctl, 2699 .mpo_check_vnode_access = mac_biba_check_vnode_open, 2700 .mpo_check_vnode_chdir = mac_biba_check_vnode_chdir, 2701 .mpo_check_vnode_chroot = mac_biba_check_vnode_chroot, 2702 .mpo_check_vnode_create = mac_biba_check_vnode_create, 2703 .mpo_check_vnode_delete = mac_biba_check_vnode_delete, 2704 .mpo_check_vnode_deleteacl = mac_biba_check_vnode_deleteacl, 2705 .mpo_check_vnode_exec = mac_biba_check_vnode_exec, 2706 .mpo_check_vnode_getacl = mac_biba_check_vnode_getacl, 2707 .mpo_check_vnode_getextattr = mac_biba_check_vnode_getextattr, 2708 .mpo_check_vnode_link = mac_biba_check_vnode_link, 2709 .mpo_check_vnode_lookup = mac_biba_check_vnode_lookup, 2710 .mpo_check_vnode_mmap = mac_biba_check_vnode_mmap, 2711 .mpo_check_vnode_mprotect = mac_biba_check_vnode_mmap, 2712 .mpo_check_vnode_open = mac_biba_check_vnode_open, 2713 .mpo_check_vnode_poll = mac_biba_check_vnode_poll, 2714 .mpo_check_vnode_read = mac_biba_check_vnode_read, 2715 .mpo_check_vnode_readdir = mac_biba_check_vnode_readdir, 2716 .mpo_check_vnode_readlink = mac_biba_check_vnode_readlink, 2717 .mpo_check_vnode_relabel = mac_biba_check_vnode_relabel, 2718 .mpo_check_vnode_rename_from = mac_biba_check_vnode_rename_from, 2719 .mpo_check_vnode_rename_to = mac_biba_check_vnode_rename_to, 2720 .mpo_check_vnode_revoke = mac_biba_check_vnode_revoke, 2721 .mpo_check_vnode_setacl = mac_biba_check_vnode_setacl, 2722 .mpo_check_vnode_setextattr = mac_biba_check_vnode_setextattr, 2723 .mpo_check_vnode_setflags = mac_biba_check_vnode_setflags, 2724 .mpo_check_vnode_setmode = mac_biba_check_vnode_setmode, 2725 .mpo_check_vnode_setowner = mac_biba_check_vnode_setowner, 2726 .mpo_check_vnode_setutimes = mac_biba_check_vnode_setutimes, 2727 .mpo_check_vnode_stat = mac_biba_check_vnode_stat, 2728 .mpo_check_vnode_write = mac_biba_check_vnode_write, 2729}; 2730 2731MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", 2732 MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &mac_biba_slot); 2733