mac_biba.c revision 106160
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 106160 2002-10-29 19:14:16Z 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_privileged(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_privileged: 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 340static int 341mac_biba_high_single(struct mac_biba *mac_biba) 342{ 343 344 KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 345 ("mac_biba_equal_single: mac_biba not single")); 346 347 return (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_HIGH); 348} 349 350static int 351mac_biba_valid(struct mac_biba *mac_biba) 352{ 353 354 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { 355 switch (mac_biba->mb_single.mbe_type) { 356 case MAC_BIBA_TYPE_GRADE: 357 break; 358 359 case MAC_BIBA_TYPE_EQUAL: 360 case MAC_BIBA_TYPE_HIGH: 361 case MAC_BIBA_TYPE_LOW: 362 if (mac_biba->mb_single.mbe_grade != 0 || 363 !MAC_BIBA_BIT_SET_EMPTY( 364 mac_biba->mb_single.mbe_compartments)) 365 return (EINVAL); 366 break; 367 368 default: 369 return (EINVAL); 370 } 371 } else { 372 if (mac_biba->mb_single.mbe_type != MAC_BIBA_TYPE_UNDEF) 373 return (EINVAL); 374 } 375 376 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 377 switch (mac_biba->mb_rangelow.mbe_type) { 378 case MAC_BIBA_TYPE_GRADE: 379 break; 380 381 case MAC_BIBA_TYPE_EQUAL: 382 case MAC_BIBA_TYPE_HIGH: 383 case MAC_BIBA_TYPE_LOW: 384 if (mac_biba->mb_rangelow.mbe_grade != 0 || 385 !MAC_BIBA_BIT_SET_EMPTY( 386 mac_biba->mb_rangelow.mbe_compartments)) 387 return (EINVAL); 388 break; 389 390 default: 391 return (EINVAL); 392 } 393 394 switch (mac_biba->mb_rangehigh.mbe_type) { 395 case MAC_BIBA_TYPE_GRADE: 396 break; 397 398 case MAC_BIBA_TYPE_EQUAL: 399 case MAC_BIBA_TYPE_HIGH: 400 case MAC_BIBA_TYPE_LOW: 401 if (mac_biba->mb_rangehigh.mbe_grade != 0 || 402 !MAC_BIBA_BIT_SET_EMPTY( 403 mac_biba->mb_rangehigh.mbe_compartments)) 404 return (EINVAL); 405 break; 406 407 default: 408 return (EINVAL); 409 } 410 if (!mac_biba_dominate_element(&mac_biba->mb_rangehigh, 411 &mac_biba->mb_rangelow)) 412 return (EINVAL); 413 } else { 414 if (mac_biba->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF || 415 mac_biba->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF) 416 return (EINVAL); 417 } 418 419 return (0); 420} 421 422static void 423mac_biba_set_range(struct mac_biba *mac_biba, u_short typelow, 424 u_short gradelow, u_char *compartmentslow, u_short typehigh, 425 u_short gradehigh, u_char *compartmentshigh) 426{ 427 428 mac_biba->mb_rangelow.mbe_type = typelow; 429 mac_biba->mb_rangelow.mbe_grade = gradelow; 430 if (compartmentslow != NULL) 431 memcpy(mac_biba->mb_rangelow.mbe_compartments, 432 compartmentslow, 433 sizeof(mac_biba->mb_rangelow.mbe_compartments)); 434 mac_biba->mb_rangehigh.mbe_type = typehigh; 435 mac_biba->mb_rangehigh.mbe_grade = gradehigh; 436 if (compartmentshigh != NULL) 437 memcpy(mac_biba->mb_rangehigh.mbe_compartments, 438 compartmentshigh, 439 sizeof(mac_biba->mb_rangehigh.mbe_compartments)); 440 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 441} 442 443static void 444mac_biba_set_single(struct mac_biba *mac_biba, u_short type, u_short grade, 445 u_char *compartments) 446{ 447 448 mac_biba->mb_single.mbe_type = type; 449 mac_biba->mb_single.mbe_grade = grade; 450 if (compartments != NULL) 451 memcpy(mac_biba->mb_single.mbe_compartments, compartments, 452 sizeof(mac_biba->mb_single.mbe_compartments)); 453 mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; 454} 455 456static void 457mac_biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto) 458{ 459 460 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, 461 ("mac_biba_copy_range: labelfrom not range")); 462 463 labelto->mb_rangelow = labelfrom->mb_rangelow; 464 labelto->mb_rangehigh = labelfrom->mb_rangehigh; 465 labelto->mb_flags |= MAC_BIBA_FLAG_RANGE; 466} 467 468static void 469mac_biba_copy_single(struct mac_biba *labelfrom, struct mac_biba *labelto) 470{ 471 472 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, 473 ("mac_biba_copy_single: labelfrom not single")); 474 475 labelto->mb_single = labelfrom->mb_single; 476 labelto->mb_flags |= MAC_BIBA_FLAG_SINGLE; 477} 478 479static void 480mac_biba_copy(struct mac_biba *source, struct mac_biba *dest) 481{ 482 483 if (source->mb_flags & MAC_BIBA_FLAG_SINGLE) 484 mac_biba_copy_single(source, dest); 485 if (source->mb_flags & MAC_BIBA_FLAG_RANGE) 486 mac_biba_copy_range(source, dest); 487} 488 489/* 490 * Policy module operations. 491 */ 492static void 493mac_biba_destroy(struct mac_policy_conf *conf) 494{ 495 496} 497 498static void 499mac_biba_init(struct mac_policy_conf *conf) 500{ 501 502} 503 504/* 505 * Label operations. 506 */ 507static void 508mac_biba_init_label(struct label *label) 509{ 510 511 SLOT(label) = biba_alloc(M_WAITOK); 512} 513 514static int 515mac_biba_init_label_waitcheck(struct label *label, int flag) 516{ 517 518 SLOT(label) = biba_alloc(flag); 519 if (SLOT(label) == NULL) 520 return (ENOMEM); 521 522 return (0); 523} 524 525static void 526mac_biba_destroy_label(struct label *label) 527{ 528 529 biba_free(SLOT(label)); 530 SLOT(label) = NULL; 531} 532 533/* 534 * mac_biba_element_to_string() is basically an snprintf wrapper with 535 * the same properties as snprintf(). It returns the length it would 536 * have added to the string in the event the string is too short. 537 */ 538static size_t 539mac_biba_element_to_string(char *string, size_t size, 540 struct mac_biba_element *element) 541{ 542 int pos, bit = 1; 543 544 switch (element->mbe_type) { 545 case MAC_BIBA_TYPE_HIGH: 546 return (snprintf(string, size, "high")); 547 548 case MAC_BIBA_TYPE_LOW: 549 return (snprintf(string, size, "low")); 550 551 case MAC_BIBA_TYPE_EQUAL: 552 return (snprintf(string, size, "equal")); 553 554 case MAC_BIBA_TYPE_GRADE: 555 pos = snprintf(string, size, "%d:", element->mbe_grade); 556 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) { 557 if (MAC_BIBA_BIT_TEST(bit, element->mbe_compartments)) 558 pos += snprintf(string + pos, size - pos, 559 "%d+", bit); 560 } 561 if (string[pos - 1] == '+' || string[pos - 1] == ':') 562 string[--pos] = NULL; 563 return (pos); 564 565 default: 566 panic("mac_biba_element_to_string: invalid type (%d)", 567 element->mbe_type); 568 } 569} 570 571static int 572mac_biba_to_string(char *string, size_t size, size_t *caller_len, 573 struct mac_biba *mac_biba) 574{ 575 size_t left, len; 576 char *curptr; 577 578 bzero(string, size); 579 curptr = string; 580 left = size; 581 582 if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { 583 len = mac_biba_element_to_string(curptr, left, 584 &mac_biba->mb_single); 585 if (len >= left) 586 return (EINVAL); 587 left -= len; 588 curptr += len; 589 } 590 591 if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { 592 len = snprintf(curptr, left, "("); 593 if (len >= left) 594 return (EINVAL); 595 left -= len; 596 curptr += len; 597 598 len = mac_biba_element_to_string(curptr, left, 599 &mac_biba->mb_rangelow); 600 if (len >= left) 601 return (EINVAL); 602 left -= len; 603 curptr += len; 604 605 len = snprintf(curptr, left, "-"); 606 if (len >= left) 607 return (EINVAL); 608 left -= len; 609 curptr += len; 610 611 len = mac_biba_element_to_string(curptr, left, 612 &mac_biba->mb_rangehigh); 613 if (len >= left) 614 return (EINVAL); 615 left -= len; 616 curptr += len; 617 618 len = snprintf(curptr, left, ")"); 619 if (len >= left) 620 return (EINVAL); 621 left -= len; 622 curptr += len; 623 } 624 625 *caller_len = strlen(string); 626 return (0); 627} 628 629static int 630mac_biba_externalize_label(struct label *label, char *element_name, 631 char *element_data, size_t size, size_t *len, int *claimed) 632{ 633 struct mac_biba *mac_biba; 634 int error; 635 636 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 637 return (0); 638 639 (*claimed)++; 640 641 mac_biba = SLOT(label); 642 error = mac_biba_to_string(element_data, size, len, mac_biba); 643 if (error) 644 return (error); 645 646 *len = strlen(element_data); 647 return (0); 648} 649 650static int 651mac_biba_parse_element(struct mac_biba_element *element, char *string) 652{ 653 654 if (strcmp(string, "high") == 0 || 655 strcmp(string, "hi") == 0) { 656 element->mbe_type = MAC_BIBA_TYPE_HIGH; 657 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 658 } else if (strcmp(string, "low") == 0 || 659 strcmp(string, "lo") == 0) { 660 element->mbe_type = MAC_BIBA_TYPE_LOW; 661 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 662 } else if (strcmp(string, "equal") == 0 || 663 strcmp(string, "eq") == 0) { 664 element->mbe_type = MAC_BIBA_TYPE_EQUAL; 665 element->mbe_grade = MAC_BIBA_TYPE_UNDEF; 666 } else { 667 char *p0, *p1; 668 int d; 669 670 p0 = string; 671 d = strtol(p0, &p1, 10); 672 673 if (d < 0 || d > 65535) 674 return (EINVAL); 675 element->mbe_type = MAC_BIBA_TYPE_GRADE; 676 element->mbe_grade = d; 677 678 if (*p1 != ':') { 679 if (p1 == p0 || *p1 != '\0') 680 return (EINVAL); 681 else 682 return (0); 683 } 684 else 685 if (*(p1 + 1) == '\0') 686 return (0); 687 688 while ((p0 = ++p1)) { 689 d = strtol(p0, &p1, 10); 690 if (d < 1 || d > MAC_BIBA_MAX_COMPARTMENTS) 691 return (EINVAL); 692 693 MAC_BIBA_BIT_SET(d, element->mbe_compartments); 694 695 if (*p1 == '\0') 696 break; 697 if (p1 == p0 || *p1 != '+') 698 return (EINVAL); 699 } 700 } 701 702 return (0); 703} 704 705/* 706 * Note: destructively consumes the string, make a local copy before 707 * calling if that's a problem. 708 */ 709static int 710mac_biba_parse(struct mac_biba *mac_biba, char *string) 711{ 712 char *range, *rangeend, *rangehigh, *rangelow, *single; 713 int error; 714 715 /* Do we have a range? */ 716 single = string; 717 range = index(string, '('); 718 if (range == single) 719 single = NULL; 720 rangelow = rangehigh = NULL; 721 if (range != NULL) { 722 /* Nul terminate the end of the single string. */ 723 *range = '\0'; 724 range++; 725 rangelow = range; 726 rangehigh = index(rangelow, '-'); 727 if (rangehigh == NULL) 728 return (EINVAL); 729 rangehigh++; 730 if (*rangelow == '\0' || *rangehigh == '\0') 731 return (EINVAL); 732 rangeend = index(rangehigh, ')'); 733 if (rangeend == NULL) 734 return (EINVAL); 735 if (*(rangeend + 1) != '\0') 736 return (EINVAL); 737 /* Nul terminate the ends of the ranges. */ 738 *(rangehigh - 1) = '\0'; 739 *rangeend = '\0'; 740 } 741 KASSERT((rangelow != NULL && rangehigh != NULL) || 742 (rangelow == NULL && rangehigh == NULL), 743 ("mac_biba_internalize_label: range mismatch")); 744 745 bzero(mac_biba, sizeof(*mac_biba)); 746 if (single != NULL) { 747 error = mac_biba_parse_element(&mac_biba->mb_single, single); 748 if (error) 749 return (error); 750 mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; 751 } 752 753 if (rangelow != NULL) { 754 error = mac_biba_parse_element(&mac_biba->mb_rangelow, 755 rangelow); 756 if (error) 757 return (error); 758 error = mac_biba_parse_element(&mac_biba->mb_rangehigh, 759 rangehigh); 760 if (error) 761 return (error); 762 mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; 763 } 764 765 error = mac_biba_valid(mac_biba); 766 if (error) 767 return (error); 768 769 return (0); 770} 771 772static int 773mac_biba_internalize_label(struct label *label, char *element_name, 774 char *element_data, int *claimed) 775{ 776 struct mac_biba *mac_biba, mac_biba_temp; 777 int error; 778 779 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) 780 return (0); 781 782 (*claimed)++; 783 784 error = mac_biba_parse(&mac_biba_temp, element_data); 785 if (error) 786 return (error); 787 788 mac_biba = SLOT(label); 789 *mac_biba = mac_biba_temp; 790 791 return (0); 792} 793 794static void 795mac_biba_copy_label(struct label *src, struct label *dest) 796{ 797 798 *SLOT(dest) = *SLOT(src); 799} 800 801/* 802 * Labeling event operations: file system objects, and things that look 803 * a lot like file system objects. 804 */ 805static void 806mac_biba_create_devfs_device(dev_t dev, struct devfs_dirent *devfs_dirent, 807 struct label *label) 808{ 809 struct mac_biba *mac_biba; 810 int biba_type; 811 812 mac_biba = SLOT(label); 813 if (strcmp(dev->si_name, "null") == 0 || 814 strcmp(dev->si_name, "zero") == 0 || 815 strcmp(dev->si_name, "random") == 0 || 816 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) 817 biba_type = MAC_BIBA_TYPE_EQUAL; 818 else if (ptys_equal && 819 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 820 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 821 biba_type = MAC_BIBA_TYPE_EQUAL; 822 else 823 biba_type = MAC_BIBA_TYPE_HIGH; 824 mac_biba_set_single(mac_biba, biba_type, 0, NULL); 825} 826 827static void 828mac_biba_create_devfs_directory(char *dirname, int dirnamelen, 829 struct devfs_dirent *devfs_dirent, struct label *label) 830{ 831 struct mac_biba *mac_biba; 832 833 mac_biba = SLOT(label); 834 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 835} 836 837static void 838mac_biba_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd, 839 struct label *ddlabel, struct devfs_dirent *de, struct label *delabel) 840{ 841 struct mac_biba *source, *dest; 842 843 source = SLOT(&cred->cr_label); 844 dest = SLOT(delabel); 845 846 mac_biba_copy_single(source, dest); 847} 848 849static void 850mac_biba_create_devfs_vnode(struct devfs_dirent *devfs_dirent, 851 struct label *direntlabel, struct vnode *vp, struct label *vnodelabel) 852{ 853 struct mac_biba *source, *dest; 854 855 source = SLOT(direntlabel); 856 dest = SLOT(vnodelabel); 857 mac_biba_copy_single(source, dest); 858} 859 860static void 861mac_biba_create_mount(struct ucred *cred, struct mount *mp, 862 struct label *mntlabel, struct label *fslabel) 863{ 864 struct mac_biba *source, *dest; 865 866 source = SLOT(&cred->cr_label); 867 dest = SLOT(mntlabel); 868 mac_biba_copy_single(source, dest); 869 dest = SLOT(fslabel); 870 mac_biba_copy_single(source, dest); 871} 872 873static void 874mac_biba_create_root_mount(struct ucred *cred, struct mount *mp, 875 struct label *mntlabel, struct label *fslabel) 876{ 877 struct mac_biba *mac_biba; 878 879 /* Always mount root as high integrity. */ 880 mac_biba = SLOT(fslabel); 881 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 882 mac_biba = SLOT(mntlabel); 883 mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL); 884} 885 886static void 887mac_biba_relabel_vnode(struct ucred *cred, struct vnode *vp, 888 struct label *vnodelabel, struct label *label) 889{ 890 struct mac_biba *source, *dest; 891 892 source = SLOT(label); 893 dest = SLOT(vnodelabel); 894 895 mac_biba_copy(source, dest); 896} 897 898static void 899mac_biba_update_devfsdirent(struct devfs_dirent *devfs_dirent, 900 struct label *direntlabel, struct vnode *vp, struct label *vnodelabel) 901{ 902 struct mac_biba *source, *dest; 903 904 source = SLOT(vnodelabel); 905 dest = SLOT(direntlabel); 906 907 mac_biba_copy(source, dest); 908} 909 910static void 911mac_biba_associate_vnode_devfs(struct mount *mp, struct label *fslabel, 912 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 913 struct label *vlabel) 914{ 915 struct mac_biba *source, *dest; 916 917 source = SLOT(delabel); 918 dest = SLOT(vlabel); 919 920 mac_biba_copy_single(source, dest); 921} 922 923static int 924mac_biba_associate_vnode_extattr(struct mount *mp, struct label *fslabel, 925 struct vnode *vp, struct label *vlabel) 926{ 927 struct mac_biba temp, *source, *dest; 928 size_t buflen; 929 int error; 930 931 source = SLOT(fslabel); 932 dest = SLOT(vlabel); 933 934 buflen = sizeof(temp); 935 bzero(&temp, buflen); 936 937 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 938 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &temp, curthread); 939 if (error == ENOATTR || error == EOPNOTSUPP) { 940 /* Fall back to the fslabel. */ 941 mac_biba_copy_single(source, dest); 942 return (0); 943 } else if (error) 944 return (error); 945 946 if (buflen != sizeof(temp)) { 947 printf("mac_biba_associate_vnode_extattr: bad size %d\n", 948 buflen); 949 return (EPERM); 950 } 951 if (mac_biba_valid(&temp) != 0) { 952 printf("mac_biba_associate_vnode_extattr: invalid\n"); 953 return (EPERM); 954 } 955 if ((temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) { 956 printf("mac_biba_associate_vnode_extattr: not single\n"); 957 return (EPERM); 958 } 959 960 mac_biba_copy_single(&temp, dest); 961 return (0); 962} 963 964static void 965mac_biba_associate_vnode_singlelabel(struct mount *mp, 966 struct label *fslabel, struct vnode *vp, struct label *vlabel) 967{ 968 struct mac_biba *source, *dest; 969 970 source = SLOT(fslabel); 971 dest = SLOT(vlabel); 972 973 mac_biba_copy_single(source, dest); 974} 975 976static int 977mac_biba_create_vnode_extattr(struct ucred *cred, struct mount *mp, 978 struct label *fslabel, struct vnode *dvp, struct label *dlabel, 979 struct vnode *vp, struct label *vlabel, struct componentname *cnp) 980{ 981 struct mac_biba *source, *dest, temp; 982 size_t buflen; 983 int error; 984 985 buflen = sizeof(temp); 986 bzero(&temp, buflen); 987 988 source = SLOT(&cred->cr_label); 989 dest = SLOT(vlabel); 990 mac_biba_copy_single(source, &temp); 991 992 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 993 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 994 if (error == 0) 995 mac_biba_copy_single(source, dest); 996 return (error); 997} 998 999static int 1000mac_biba_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 1001 struct label *vlabel, struct label *intlabel) 1002{ 1003 struct mac_biba *source, temp; 1004 size_t buflen; 1005 int error; 1006 1007 buflen = sizeof(temp); 1008 bzero(&temp, buflen); 1009 1010 source = SLOT(intlabel); 1011 if ((source->mb_flags & MAC_BIBA_FLAG_SINGLE) == 0) 1012 return (0); 1013 1014 mac_biba_copy_single(source, &temp); 1015 1016 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, 1017 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread); 1018 return (error); 1019} 1020 1021/* 1022 * Labeling event operations: IPC object. 1023 */ 1024static void 1025mac_biba_create_mbuf_from_socket(struct socket *so, struct label *socketlabel, 1026 struct mbuf *m, struct label *mbuflabel) 1027{ 1028 struct mac_biba *source, *dest; 1029 1030 source = SLOT(socketlabel); 1031 dest = SLOT(mbuflabel); 1032 1033 mac_biba_copy_single(source, dest); 1034} 1035 1036static void 1037mac_biba_create_socket(struct ucred *cred, struct socket *socket, 1038 struct label *socketlabel) 1039{ 1040 struct mac_biba *source, *dest; 1041 1042 source = SLOT(&cred->cr_label); 1043 dest = SLOT(socketlabel); 1044 1045 mac_biba_copy_single(source, dest); 1046} 1047 1048static void 1049mac_biba_create_pipe(struct ucred *cred, struct pipe *pipe, 1050 struct label *pipelabel) 1051{ 1052 struct mac_biba *source, *dest; 1053 1054 source = SLOT(&cred->cr_label); 1055 dest = SLOT(pipelabel); 1056 1057 mac_biba_copy_single(source, dest); 1058} 1059 1060static void 1061mac_biba_create_socket_from_socket(struct socket *oldsocket, 1062 struct label *oldsocketlabel, struct socket *newsocket, 1063 struct label *newsocketlabel) 1064{ 1065 struct mac_biba *source, *dest; 1066 1067 source = SLOT(oldsocketlabel); 1068 dest = SLOT(newsocketlabel); 1069 1070 mac_biba_copy_single(source, dest); 1071} 1072 1073static void 1074mac_biba_relabel_socket(struct ucred *cred, struct socket *socket, 1075 struct label *socketlabel, struct label *newlabel) 1076{ 1077 struct mac_biba *source, *dest; 1078 1079 source = SLOT(newlabel); 1080 dest = SLOT(socketlabel); 1081 1082 mac_biba_copy(source, dest); 1083} 1084 1085static void 1086mac_biba_relabel_pipe(struct ucred *cred, struct pipe *pipe, 1087 struct label *pipelabel, struct label *newlabel) 1088{ 1089 struct mac_biba *source, *dest; 1090 1091 source = SLOT(newlabel); 1092 dest = SLOT(pipelabel); 1093 1094 mac_biba_copy(source, dest); 1095} 1096 1097static void 1098mac_biba_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel, 1099 struct socket *socket, struct label *socketpeerlabel) 1100{ 1101 struct mac_biba *source, *dest; 1102 1103 source = SLOT(mbuflabel); 1104 dest = SLOT(socketpeerlabel); 1105 1106 mac_biba_copy_single(source, dest); 1107} 1108 1109/* 1110 * Labeling event operations: network objects. 1111 */ 1112static void 1113mac_biba_set_socket_peer_from_socket(struct socket *oldsocket, 1114 struct label *oldsocketlabel, struct socket *newsocket, 1115 struct label *newsocketpeerlabel) 1116{ 1117 struct mac_biba *source, *dest; 1118 1119 source = SLOT(oldsocketlabel); 1120 dest = SLOT(newsocketpeerlabel); 1121 1122 mac_biba_copy_single(source, dest); 1123} 1124 1125static void 1126mac_biba_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d, 1127 struct label *bpflabel) 1128{ 1129 struct mac_biba *source, *dest; 1130 1131 source = SLOT(&cred->cr_label); 1132 dest = SLOT(bpflabel); 1133 1134 mac_biba_copy_single(source, dest); 1135} 1136 1137static void 1138mac_biba_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel) 1139{ 1140 char tifname[IFNAMSIZ], ifname[IFNAMSIZ], *p, *q; 1141 char tiflist[sizeof(trusted_interfaces)]; 1142 struct mac_biba *dest; 1143 int len, grade; 1144 1145 dest = SLOT(ifnetlabel); 1146 1147 if (ifnet->if_type == IFT_LOOP) { 1148 grade = MAC_BIBA_TYPE_EQUAL; 1149 goto set; 1150 } 1151 1152 if (trust_all_interfaces) { 1153 grade = MAC_BIBA_TYPE_HIGH; 1154 goto set; 1155 } 1156 1157 grade = MAC_BIBA_TYPE_LOW; 1158 1159 if (trusted_interfaces[0] == '\0' || 1160 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1161 goto set; 1162 1163 bzero(tiflist, sizeof(tiflist)); 1164 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1165 if(*p != ' ' && *p != '\t') 1166 *q = *p; 1167 1168 snprintf(ifname, IFNAMSIZ, "%s%d", ifnet->if_name, ifnet->if_unit); 1169 1170 for (p = q = tiflist;; p++) { 1171 if (*p == ',' || *p == '\0') { 1172 len = p - q; 1173 if (len < IFNAMSIZ) { 1174 bzero(tifname, sizeof(tifname)); 1175 bcopy(q, tifname, len); 1176 if (strcmp(tifname, ifname) == 0) { 1177 grade = MAC_BIBA_TYPE_HIGH; 1178 break; 1179 } 1180 } else { 1181 *p = '\0'; 1182 printf("mac_biba warning: interface name " 1183 "\"%s\" is too long (must be < %d)\n", 1184 q, IFNAMSIZ); 1185 } 1186 if (*p == '\0') 1187 break; 1188 q = p + 1; 1189 } 1190 } 1191set: 1192 mac_biba_set_single(dest, grade, 0, NULL); 1193 mac_biba_set_range(dest, grade, 0, NULL, grade, 0, NULL); 1194} 1195 1196static void 1197mac_biba_create_ipq(struct mbuf *fragment, struct label *fragmentlabel, 1198 struct ipq *ipq, struct label *ipqlabel) 1199{ 1200 struct mac_biba *source, *dest; 1201 1202 source = SLOT(fragmentlabel); 1203 dest = SLOT(ipqlabel); 1204 1205 mac_biba_copy_single(source, dest); 1206} 1207 1208static void 1209mac_biba_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel, 1210 struct mbuf *datagram, struct label *datagramlabel) 1211{ 1212 struct mac_biba *source, *dest; 1213 1214 source = SLOT(ipqlabel); 1215 dest = SLOT(datagramlabel); 1216 1217 /* Just use the head, since we require them all to match. */ 1218 mac_biba_copy_single(source, dest); 1219} 1220 1221static void 1222mac_biba_create_fragment(struct mbuf *datagram, struct label *datagramlabel, 1223 struct mbuf *fragment, struct label *fragmentlabel) 1224{ 1225 struct mac_biba *source, *dest; 1226 1227 source = SLOT(datagramlabel); 1228 dest = SLOT(fragmentlabel); 1229 1230 mac_biba_copy_single(source, dest); 1231} 1232 1233static void 1234mac_biba_create_mbuf_from_mbuf(struct mbuf *oldmbuf, 1235 struct label *oldmbuflabel, struct mbuf *newmbuf, 1236 struct label *newmbuflabel) 1237{ 1238 struct mac_biba *source, *dest; 1239 1240 source = SLOT(oldmbuflabel); 1241 dest = SLOT(newmbuflabel); 1242 1243 /* 1244 * Because the source mbuf may not yet have been "created", 1245 * just initialized, we do a conditional copy. Since we don't 1246 * allow mbufs to have ranges, do a KASSERT to make sure that 1247 * doesn't happen. 1248 */ 1249 KASSERT((source->mb_flags & MAC_BIBA_FLAG_RANGE) == 0, 1250 ("mac_biba_create_mbuf_from_mbuf: source mbuf has range")); 1251 mac_biba_copy(source, dest); 1252} 1253 1254static void 1255mac_biba_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel, 1256 struct mbuf *mbuf, struct label *mbuflabel) 1257{ 1258 struct mac_biba *dest; 1259 1260 dest = SLOT(mbuflabel); 1261 1262 mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1263} 1264 1265static void 1266mac_biba_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel, 1267 struct mbuf *mbuf, struct label *mbuflabel) 1268{ 1269 struct mac_biba *source, *dest; 1270 1271 source = SLOT(bpflabel); 1272 dest = SLOT(mbuflabel); 1273 1274 mac_biba_copy_single(source, dest); 1275} 1276 1277static void 1278mac_biba_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel, 1279 struct mbuf *m, struct label *mbuflabel) 1280{ 1281 struct mac_biba *source, *dest; 1282 1283 source = SLOT(ifnetlabel); 1284 dest = SLOT(mbuflabel); 1285 1286 mac_biba_copy_single(source, dest); 1287} 1288 1289static void 1290mac_biba_create_mbuf_multicast_encap(struct mbuf *oldmbuf, 1291 struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel, 1292 struct mbuf *newmbuf, struct label *newmbuflabel) 1293{ 1294 struct mac_biba *source, *dest; 1295 1296 source = SLOT(oldmbuflabel); 1297 dest = SLOT(newmbuflabel); 1298 1299 mac_biba_copy_single(source, dest); 1300} 1301 1302static void 1303mac_biba_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel, 1304 struct mbuf *newmbuf, struct label *newmbuflabel) 1305{ 1306 struct mac_biba *source, *dest; 1307 1308 source = SLOT(oldmbuflabel); 1309 dest = SLOT(newmbuflabel); 1310 1311 mac_biba_copy_single(source, dest); 1312} 1313 1314static int 1315mac_biba_fragment_match(struct mbuf *fragment, struct label *fragmentlabel, 1316 struct ipq *ipq, struct label *ipqlabel) 1317{ 1318 struct mac_biba *a, *b; 1319 1320 a = SLOT(ipqlabel); 1321 b = SLOT(fragmentlabel); 1322 1323 return (mac_biba_equal_single(a, b)); 1324} 1325 1326static void 1327mac_biba_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet, 1328 struct label *ifnetlabel, struct label *newlabel) 1329{ 1330 struct mac_biba *source, *dest; 1331 1332 source = SLOT(newlabel); 1333 dest = SLOT(ifnetlabel); 1334 1335 mac_biba_copy(source, dest); 1336} 1337 1338static void 1339mac_biba_update_ipq(struct mbuf *fragment, struct label *fragmentlabel, 1340 struct ipq *ipq, struct label *ipqlabel) 1341{ 1342 1343 /* NOOP: we only accept matching labels, so no need to update */ 1344} 1345 1346/* 1347 * Labeling event operations: processes. 1348 */ 1349static void 1350mac_biba_create_cred(struct ucred *cred_parent, struct ucred *cred_child) 1351{ 1352 struct mac_biba *source, *dest; 1353 1354 source = SLOT(&cred_parent->cr_label); 1355 dest = SLOT(&cred_child->cr_label); 1356 1357 mac_biba_copy_single(source, dest); 1358 mac_biba_copy_range(source, dest); 1359} 1360 1361static void 1362mac_biba_execve_transition(struct ucred *old, struct ucred *new, 1363 struct vnode *vp, struct mac *vnodelabel) 1364{ 1365 struct mac_biba *source, *dest; 1366 1367 source = SLOT(&old->cr_label); 1368 dest = SLOT(&new->cr_label); 1369 1370 mac_biba_copy_single(source, dest); 1371 mac_biba_copy_range(source, dest); 1372} 1373 1374static int 1375mac_biba_execve_will_transition(struct ucred *old, struct vnode *vp, 1376 struct mac *vnodelabel) 1377{ 1378 1379 return (0); 1380} 1381 1382static void 1383mac_biba_create_proc0(struct ucred *cred) 1384{ 1385 struct mac_biba *dest; 1386 1387 dest = SLOT(&cred->cr_label); 1388 1389 mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); 1390 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1391 MAC_BIBA_TYPE_HIGH, 0, NULL); 1392} 1393 1394static void 1395mac_biba_create_proc1(struct ucred *cred) 1396{ 1397 struct mac_biba *dest; 1398 1399 dest = SLOT(&cred->cr_label); 1400 1401 mac_biba_set_single(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); 1402 mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, 1403 MAC_BIBA_TYPE_HIGH, 0, NULL); 1404} 1405 1406static void 1407mac_biba_relabel_cred(struct ucred *cred, struct label *newlabel) 1408{ 1409 struct mac_biba *source, *dest; 1410 1411 source = SLOT(newlabel); 1412 dest = SLOT(&cred->cr_label); 1413 1414 mac_biba_copy(source, dest); 1415} 1416 1417/* 1418 * Access control checks. 1419 */ 1420static int 1421mac_biba_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel, 1422 struct ifnet *ifnet, struct label *ifnetlabel) 1423{ 1424 struct mac_biba *a, *b; 1425 1426 if (!mac_biba_enabled) 1427 return (0); 1428 1429 a = SLOT(bpflabel); 1430 b = SLOT(ifnetlabel); 1431 1432 if (mac_biba_equal_single(a, b)) 1433 return (0); 1434 return (EACCES); 1435} 1436 1437static int 1438mac_biba_check_cred_relabel(struct ucred *cred, struct label *newlabel) 1439{ 1440 struct mac_biba *subj, *new; 1441 int error; 1442 1443 subj = SLOT(&cred->cr_label); 1444 new = SLOT(newlabel); 1445 1446 /* 1447 * If there is a Biba label update for the credential, it may 1448 * be an update of the single, range, or both. 1449 */ 1450 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1451 if (error) 1452 return (error); 1453 1454 /* 1455 * If the Biba label is to be changed, authorize as appropriate. 1456 */ 1457 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1458 /* 1459 * To change the Biba single label on a credential, the 1460 * new single label must be in the current range. 1461 */ 1462 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE && 1463 !mac_biba_single_in_range(new, subj)) 1464 return (EPERM); 1465 1466 /* 1467 * To change the Biba range on a credential, the new 1468 * range label must be in the current range. 1469 */ 1470 if (new->mb_flags & MAC_BIBA_FLAG_RANGE && 1471 !mac_biba_range_in_range(new, subj)) 1472 return (EPERM); 1473 1474 /* 1475 * To have EQUAL in any component of the new credential 1476 * Biba label, the subject must already have EQUAL in 1477 * their label. 1478 */ 1479 if (mac_biba_contains_equal(new)) { 1480 error = mac_biba_subject_privileged(subj); 1481 if (error) 1482 return (error); 1483 } 1484 1485 /* 1486 * XXXMAC: Additional consistency tests regarding the 1487 * single and range of the new label might be performed 1488 * here. 1489 */ 1490 } 1491 1492 return (0); 1493} 1494 1495static int 1496mac_biba_check_cred_visible(struct ucred *u1, struct ucred *u2) 1497{ 1498 struct mac_biba *subj, *obj; 1499 1500 if (!mac_biba_enabled) 1501 return (0); 1502 1503 subj = SLOT(&u1->cr_label); 1504 obj = SLOT(&u2->cr_label); 1505 1506 /* XXX: range */ 1507 if (!mac_biba_dominate_single(obj, subj)) 1508 return (ESRCH); 1509 1510 return (0); 1511} 1512 1513static int 1514mac_biba_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet, 1515 struct label *ifnetlabel, struct label *newlabel) 1516{ 1517 struct mac_biba *subj, *new; 1518 int error; 1519 1520 subj = SLOT(&cred->cr_label); 1521 new = SLOT(newlabel); 1522 1523 /* 1524 * If there is a Biba label update for the interface, it may 1525 * be an update of the single, range, or both. 1526 */ 1527 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); 1528 if (error) 1529 return (error); 1530 1531 /* 1532 * Relabling network interfaces requires Biba privilege. 1533 */ 1534 error = mac_biba_subject_privileged(subj); 1535 if (error) 1536 return (error); 1537 1538 /* 1539 * If the Biba label is to be changed, authorize as appropriate. 1540 */ 1541 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { 1542 /* 1543 * Rely on the traditional superuser status for the Biba 1544 * interface relabel requirements. XXXMAC: This will go 1545 * away. 1546 */ 1547 error = suser_cred(cred, 0); 1548 if (error) 1549 return (EPERM); 1550 1551 /* 1552 * XXXMAC: Additional consistency tests regarding the single 1553 * and the range of the new label might be performed here. 1554 */ 1555 } 1556 1557 return (0); 1558} 1559 1560static int 1561mac_biba_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel, 1562 struct mbuf *m, struct label *mbuflabel) 1563{ 1564 struct mac_biba *p, *i; 1565 1566 if (!mac_biba_enabled) 1567 return (0); 1568 1569 p = SLOT(mbuflabel); 1570 i = SLOT(ifnetlabel); 1571 1572 return (mac_biba_single_in_range(p, i) ? 0 : EACCES); 1573} 1574 1575static int 1576mac_biba_check_mount_stat(struct ucred *cred, struct mount *mp, 1577 struct label *mntlabel) 1578{ 1579 struct mac_biba *subj, *obj; 1580 1581 if (!mac_biba_enabled) 1582 return (0); 1583 1584 subj = SLOT(&cred->cr_label); 1585 obj = SLOT(mntlabel); 1586 1587 if (!mac_biba_dominate_single(obj, subj)) 1588 return (EACCES); 1589 1590 return (0); 1591} 1592 1593static int 1594mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, 1595 struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data) 1596{ 1597 1598 if(!mac_biba_enabled) 1599 return (0); 1600 1601 /* XXX: This will be implemented soon... */ 1602 1603 return (0); 1604} 1605 1606static int 1607mac_biba_check_pipe_poll(struct ucred *cred, struct pipe *pipe, 1608 struct label *pipelabel) 1609{ 1610 struct mac_biba *subj, *obj; 1611 1612 if (!mac_biba_enabled) 1613 return (0); 1614 1615 subj = SLOT(&cred->cr_label); 1616 obj = SLOT((pipelabel)); 1617 1618 if (!mac_biba_dominate_single(obj, subj)) 1619 return (EACCES); 1620 1621 return (0); 1622} 1623 1624static int 1625mac_biba_check_pipe_read(struct ucred *cred, struct pipe *pipe, 1626 struct label *pipelabel) 1627{ 1628 struct mac_biba *subj, *obj; 1629 1630 if (!mac_biba_enabled) 1631 return (0); 1632 1633 subj = SLOT(&cred->cr_label); 1634 obj = SLOT((pipelabel)); 1635 1636 if (!mac_biba_dominate_single(obj, subj)) 1637 return (EACCES); 1638 1639 return (0); 1640} 1641 1642static int 1643mac_biba_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, 1644 struct label *pipelabel, struct label *newlabel) 1645{ 1646 struct mac_biba *subj, *obj, *new; 1647 int error; 1648 1649 new = SLOT(newlabel); 1650 subj = SLOT(&cred->cr_label); 1651 obj = SLOT(pipelabel); 1652 1653 /* 1654 * If there is a Biba label update for a pipe, it must be a 1655 * single update. 1656 */ 1657 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 1658 if (error) 1659 return (error); 1660 1661 /* 1662 * To perform a relabel of a pipe (Biba label or not), Biba must 1663 * authorize the relabel. 1664 */ 1665 if (!mac_biba_single_in_range(obj, subj)) 1666 return (EPERM); 1667 1668 /* 1669 * If the Biba label is to be changed, authorize as appropriate. 1670 */ 1671 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 1672 /* 1673 * To change the Biba label on a pipe, the new pipe label 1674 * must be in the subject range. 1675 */ 1676 if (!mac_biba_single_in_range(new, subj)) 1677 return (EPERM); 1678 1679 /* 1680 * To change the Biba label on a pipe to be EQUAL, the 1681 * subject must have appropriate privilege. 1682 */ 1683 if (mac_biba_contains_equal(new)) { 1684 error = mac_biba_subject_privileged(subj); 1685 if (error) 1686 return (error); 1687 } 1688 } 1689 1690 return (0); 1691} 1692 1693static int 1694mac_biba_check_pipe_stat(struct ucred *cred, struct pipe *pipe, 1695 struct label *pipelabel) 1696{ 1697 struct mac_biba *subj, *obj; 1698 1699 if (!mac_biba_enabled) 1700 return (0); 1701 1702 subj = SLOT(&cred->cr_label); 1703 obj = SLOT((pipelabel)); 1704 1705 if (!mac_biba_dominate_single(obj, subj)) 1706 return (EACCES); 1707 1708 return (0); 1709} 1710 1711static int 1712mac_biba_check_pipe_write(struct ucred *cred, struct pipe *pipe, 1713 struct label *pipelabel) 1714{ 1715 struct mac_biba *subj, *obj; 1716 1717 if (!mac_biba_enabled) 1718 return (0); 1719 1720 subj = SLOT(&cred->cr_label); 1721 obj = SLOT((pipelabel)); 1722 1723 if (!mac_biba_dominate_single(subj, obj)) 1724 return (EACCES); 1725 1726 return (0); 1727} 1728 1729static int 1730mac_biba_check_proc_debug(struct ucred *cred, struct proc *proc) 1731{ 1732 struct mac_biba *subj, *obj; 1733 1734 if (!mac_biba_enabled) 1735 return (0); 1736 1737 subj = SLOT(&cred->cr_label); 1738 obj = SLOT(&proc->p_ucred->cr_label); 1739 1740 /* XXX: range checks */ 1741 if (!mac_biba_dominate_single(obj, subj)) 1742 return (ESRCH); 1743 if (!mac_biba_dominate_single(subj, obj)) 1744 return (EACCES); 1745 1746 return (0); 1747} 1748 1749static int 1750mac_biba_check_proc_sched(struct ucred *cred, struct proc *proc) 1751{ 1752 struct mac_biba *subj, *obj; 1753 1754 if (!mac_biba_enabled) 1755 return (0); 1756 1757 subj = SLOT(&cred->cr_label); 1758 obj = SLOT(&proc->p_ucred->cr_label); 1759 1760 /* XXX: range checks */ 1761 if (!mac_biba_dominate_single(obj, subj)) 1762 return (ESRCH); 1763 if (!mac_biba_dominate_single(subj, obj)) 1764 return (EACCES); 1765 1766 return (0); 1767} 1768 1769static int 1770mac_biba_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) 1771{ 1772 struct mac_biba *subj, *obj; 1773 1774 if (!mac_biba_enabled) 1775 return (0); 1776 1777 subj = SLOT(&cred->cr_label); 1778 obj = SLOT(&proc->p_ucred->cr_label); 1779 1780 /* XXX: range checks */ 1781 if (!mac_biba_dominate_single(obj, subj)) 1782 return (ESRCH); 1783 if (!mac_biba_dominate_single(subj, obj)) 1784 return (EACCES); 1785 1786 return (0); 1787} 1788 1789static int 1790mac_biba_check_socket_deliver(struct socket *so, struct label *socketlabel, 1791 struct mbuf *m, struct label *mbuflabel) 1792{ 1793 struct mac_biba *p, *s; 1794 1795 if (!mac_biba_enabled) 1796 return (0); 1797 1798 p = SLOT(mbuflabel); 1799 s = SLOT(socketlabel); 1800 1801 return (mac_biba_equal_single(p, s) ? 0 : EACCES); 1802} 1803 1804static int 1805mac_biba_check_socket_relabel(struct ucred *cred, struct socket *socket, 1806 struct label *socketlabel, struct label *newlabel) 1807{ 1808 struct mac_biba *subj, *obj, *new; 1809 int error; 1810 1811 new = SLOT(newlabel); 1812 subj = SLOT(&cred->cr_label); 1813 obj = SLOT(socketlabel); 1814 1815 /* 1816 * If there is a Biba label update for the socket, it may be 1817 * an update of single. 1818 */ 1819 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 1820 if (error) 1821 return (error); 1822 1823 /* 1824 * To relabel a socket, the old socket single must be in the subject 1825 * range. 1826 */ 1827 if (!mac_biba_single_in_range(obj, subj)) 1828 return (EPERM); 1829 1830 /* 1831 * If the Biba label is to be changed, authorize as appropriate. 1832 */ 1833 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 1834 /* 1835 * To relabel a socket, the new socket single must be in 1836 * the subject range. 1837 */ 1838 if (!mac_biba_single_in_range(new, subj)) 1839 return (EPERM); 1840 1841 /* 1842 * To change the Biba label on the socket to contain EQUAL, 1843 * the subject must have appropriate privilege. 1844 */ 1845 if (mac_biba_contains_equal(new)) { 1846 error = mac_biba_subject_privileged(subj); 1847 if (error) 1848 return (error); 1849 } 1850 } 1851 1852 return (0); 1853} 1854 1855static int 1856mac_biba_check_socket_visible(struct ucred *cred, struct socket *socket, 1857 struct label *socketlabel) 1858{ 1859 struct mac_biba *subj, *obj; 1860 1861 if (!mac_biba_enabled) 1862 return (0); 1863 1864 subj = SLOT(&cred->cr_label); 1865 obj = SLOT(socketlabel); 1866 1867 if (!mac_biba_dominate_single(obj, subj)) 1868 return (ENOENT); 1869 1870 return (0); 1871} 1872 1873static int 1874mac_biba_check_vnode_chdir(struct ucred *cred, struct vnode *dvp, 1875 struct label *dlabel) 1876{ 1877 struct mac_biba *subj, *obj; 1878 1879 if (!mac_biba_enabled) 1880 return (0); 1881 1882 subj = SLOT(&cred->cr_label); 1883 obj = SLOT(dlabel); 1884 1885 if (!mac_biba_dominate_single(obj, subj)) 1886 return (EACCES); 1887 1888 return (0); 1889} 1890 1891static int 1892mac_biba_check_vnode_chroot(struct ucred *cred, struct vnode *dvp, 1893 struct label *dlabel) 1894{ 1895 struct mac_biba *subj, *obj; 1896 1897 if (!mac_biba_enabled) 1898 return (0); 1899 1900 subj = SLOT(&cred->cr_label); 1901 obj = SLOT(dlabel); 1902 1903 if (!mac_biba_dominate_single(obj, subj)) 1904 return (EACCES); 1905 1906 return (0); 1907} 1908 1909static int 1910mac_biba_check_vnode_create(struct ucred *cred, struct vnode *dvp, 1911 struct label *dlabel, struct componentname *cnp, struct vattr *vap) 1912{ 1913 struct mac_biba *subj, *obj; 1914 1915 if (!mac_biba_enabled) 1916 return (0); 1917 1918 subj = SLOT(&cred->cr_label); 1919 obj = SLOT(dlabel); 1920 1921 if (!mac_biba_dominate_single(subj, obj)) 1922 return (EACCES); 1923 1924 return (0); 1925} 1926 1927static int 1928mac_biba_check_vnode_delete(struct ucred *cred, struct vnode *dvp, 1929 struct label *dlabel, struct vnode *vp, struct label *label, 1930 struct componentname *cnp) 1931{ 1932 struct mac_biba *subj, *obj; 1933 1934 if (!mac_biba_enabled) 1935 return (0); 1936 1937 subj = SLOT(&cred->cr_label); 1938 obj = SLOT(dlabel); 1939 1940 if (!mac_biba_dominate_single(subj, obj)) 1941 return (EACCES); 1942 1943 obj = SLOT(label); 1944 1945 if (!mac_biba_dominate_single(subj, obj)) 1946 return (EACCES); 1947 1948 return (0); 1949} 1950 1951static int 1952mac_biba_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 1953 struct label *label, acl_type_t type) 1954{ 1955 struct mac_biba *subj, *obj; 1956 1957 if (!mac_biba_enabled) 1958 return (0); 1959 1960 subj = SLOT(&cred->cr_label); 1961 obj = SLOT(label); 1962 1963 if (!mac_biba_dominate_single(subj, obj)) 1964 return (EACCES); 1965 1966 return (0); 1967} 1968 1969static int 1970mac_biba_check_vnode_exec(struct ucred *cred, struct vnode *vp, 1971 struct label *label) 1972{ 1973 struct mac_biba *subj, *obj; 1974 1975 if (!mac_biba_enabled) 1976 return (0); 1977 1978 subj = SLOT(&cred->cr_label); 1979 obj = SLOT(label); 1980 1981 if (!mac_biba_dominate_single(obj, subj)) 1982 return (EACCES); 1983 1984 return (0); 1985} 1986 1987static int 1988mac_biba_check_vnode_getacl(struct ucred *cred, struct vnode *vp, 1989 struct label *label, acl_type_t type) 1990{ 1991 struct mac_biba *subj, *obj; 1992 1993 if (!mac_biba_enabled) 1994 return (0); 1995 1996 subj = SLOT(&cred->cr_label); 1997 obj = SLOT(label); 1998 1999 if (!mac_biba_dominate_single(obj, subj)) 2000 return (EACCES); 2001 2002 return (0); 2003} 2004 2005static int 2006mac_biba_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 2007 struct label *label, int attrnamespace, const char *name, struct uio *uio) 2008{ 2009 struct mac_biba *subj, *obj; 2010 2011 if (!mac_biba_enabled) 2012 return (0); 2013 2014 subj = SLOT(&cred->cr_label); 2015 obj = SLOT(label); 2016 2017 if (!mac_biba_dominate_single(obj, subj)) 2018 return (EACCES); 2019 2020 return (0); 2021} 2022 2023static int 2024mac_biba_check_vnode_link(struct ucred *cred, struct vnode *dvp, 2025 struct label *dlabel, struct vnode *vp, struct label *label, 2026 struct componentname *cnp) 2027{ 2028 struct mac_biba *subj, *obj; 2029 2030 if (!mac_biba_enabled) 2031 return (0); 2032 2033 subj = SLOT(&cred->cr_label); 2034 obj = SLOT(dlabel); 2035 2036 if (!mac_biba_dominate_single(subj, obj)) 2037 return (EACCES); 2038 2039 obj = SLOT(label); 2040 2041 if (!mac_biba_dominate_single(subj, obj)) 2042 return (EACCES); 2043 2044 return (0); 2045} 2046 2047static int 2048mac_biba_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 2049 struct label *dlabel, struct componentname *cnp) 2050{ 2051 struct mac_biba *subj, *obj; 2052 2053 if (!mac_biba_enabled) 2054 return (0); 2055 2056 subj = SLOT(&cred->cr_label); 2057 obj = SLOT(dlabel); 2058 2059 if (!mac_biba_dominate_single(obj, subj)) 2060 return (EACCES); 2061 2062 return (0); 2063} 2064 2065static int 2066mac_biba_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 2067 struct label *label, int prot) 2068{ 2069 struct mac_biba *subj, *obj; 2070 2071 /* 2072 * Rely on the use of open()-time protections to handle 2073 * non-revocation cases. 2074 */ 2075 if (!mac_biba_enabled || !revocation_enabled) 2076 return (0); 2077 2078 subj = SLOT(&cred->cr_label); 2079 obj = SLOT(label); 2080 2081 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2082 if (!mac_biba_dominate_single(obj, subj)) 2083 return (EACCES); 2084 } 2085 if (prot & VM_PROT_WRITE) { 2086 if (!mac_biba_dominate_single(subj, obj)) 2087 return (EACCES); 2088 } 2089 2090 return (0); 2091} 2092 2093static int 2094mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp, 2095 struct label *vnodelabel, mode_t acc_mode) 2096{ 2097 struct mac_biba *subj, *obj; 2098 2099 if (!mac_biba_enabled) 2100 return (0); 2101 2102 subj = SLOT(&cred->cr_label); 2103 obj = SLOT(vnodelabel); 2104 2105 /* XXX privilege override for admin? */ 2106 if (acc_mode & (VREAD | VEXEC | VSTAT)) { 2107 if (!mac_biba_dominate_single(obj, subj)) 2108 return (EACCES); 2109 } 2110 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { 2111 if (!mac_biba_dominate_single(subj, obj)) 2112 return (EACCES); 2113 } 2114 2115 return (0); 2116} 2117 2118static int 2119mac_biba_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 2120 struct vnode *vp, struct label *label) 2121{ 2122 struct mac_biba *subj, *obj; 2123 2124 if (!mac_biba_enabled || !revocation_enabled) 2125 return (0); 2126 2127 subj = SLOT(&active_cred->cr_label); 2128 obj = SLOT(label); 2129 2130 if (!mac_biba_dominate_single(obj, subj)) 2131 return (EACCES); 2132 2133 return (0); 2134} 2135 2136static int 2137mac_biba_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 2138 struct vnode *vp, struct label *label) 2139{ 2140 struct mac_biba *subj, *obj; 2141 2142 if (!mac_biba_enabled || !revocation_enabled) 2143 return (0); 2144 2145 subj = SLOT(&active_cred->cr_label); 2146 obj = SLOT(label); 2147 2148 if (!mac_biba_dominate_single(obj, subj)) 2149 return (EACCES); 2150 2151 return (0); 2152} 2153 2154static int 2155mac_biba_check_vnode_readdir(struct ucred *cred, struct vnode *dvp, 2156 struct label *dlabel) 2157{ 2158 struct mac_biba *subj, *obj; 2159 2160 if (!mac_biba_enabled) 2161 return (0); 2162 2163 subj = SLOT(&cred->cr_label); 2164 obj = SLOT(dlabel); 2165 2166 if (!mac_biba_dominate_single(obj, subj)) 2167 return (EACCES); 2168 2169 return (0); 2170} 2171 2172static int 2173mac_biba_check_vnode_readlink(struct ucred *cred, struct vnode *vp, 2174 struct label *label) 2175{ 2176 struct mac_biba *subj, *obj; 2177 2178 if (!mac_biba_enabled) 2179 return (0); 2180 2181 subj = SLOT(&cred->cr_label); 2182 obj = SLOT(label); 2183 2184 if (!mac_biba_dominate_single(obj, subj)) 2185 return (EACCES); 2186 2187 return (0); 2188} 2189 2190static int 2191mac_biba_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 2192 struct label *vnodelabel, struct label *newlabel) 2193{ 2194 struct mac_biba *old, *new, *subj; 2195 int error; 2196 2197 old = SLOT(vnodelabel); 2198 new = SLOT(newlabel); 2199 subj = SLOT(&cred->cr_label); 2200 2201 /* 2202 * If there is a Biba label update for the vnode, it must be a 2203 * single label. 2204 */ 2205 error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE); 2206 if (error) 2207 return (error); 2208 2209 /* 2210 * To perform a relabel of the vnode (Biba label or not), Biba must 2211 * authorize the relabel. 2212 */ 2213 if (!mac_biba_single_in_range(old, subj)) 2214 return (EPERM); 2215 2216 /* 2217 * If the Biba label is to be changed, authorize as appropriate. 2218 */ 2219 if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) { 2220 /* 2221 * To change the Biba label on a vnode, the new vnode label 2222 * must be in the subject range. 2223 */ 2224 if (!mac_biba_single_in_range(new, subj)) 2225 return (EPERM); 2226 2227 /* 2228 * To change the Biba label on the vnode to be EQUAL, 2229 * the subject must have appropriate privilege. 2230 */ 2231 if (mac_biba_contains_equal(new)) { 2232 error = mac_biba_subject_privileged(subj); 2233 if (error) 2234 return (error); 2235 } 2236 } 2237 2238 return (0); 2239} 2240 2241static int 2242mac_biba_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 2243 struct label *dlabel, struct vnode *vp, struct label *label, 2244 struct componentname *cnp) 2245{ 2246 struct mac_biba *subj, *obj; 2247 2248 if (!mac_biba_enabled) 2249 return (0); 2250 2251 subj = SLOT(&cred->cr_label); 2252 obj = SLOT(dlabel); 2253 2254 if (!mac_biba_dominate_single(subj, obj)) 2255 return (EACCES); 2256 2257 obj = SLOT(label); 2258 2259 if (!mac_biba_dominate_single(subj, obj)) 2260 return (EACCES); 2261 2262 return (0); 2263} 2264 2265static int 2266mac_biba_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 2267 struct label *dlabel, struct vnode *vp, struct label *label, int samedir, 2268 struct componentname *cnp) 2269{ 2270 struct mac_biba *subj, *obj; 2271 2272 if (!mac_biba_enabled) 2273 return (0); 2274 2275 subj = SLOT(&cred->cr_label); 2276 obj = SLOT(dlabel); 2277 2278 if (!mac_biba_dominate_single(subj, obj)) 2279 return (EACCES); 2280 2281 if (vp != NULL) { 2282 obj = SLOT(label); 2283 2284 if (!mac_biba_dominate_single(subj, obj)) 2285 return (EACCES); 2286 } 2287 2288 return (0); 2289} 2290 2291static int 2292mac_biba_check_vnode_revoke(struct ucred *cred, struct vnode *vp, 2293 struct label *label) 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(label); 2302 2303 if (!mac_biba_dominate_single(subj, obj)) 2304 return (EACCES); 2305 2306 return (0); 2307} 2308 2309static int 2310mac_biba_check_vnode_setacl(struct ucred *cred, struct vnode *vp, 2311 struct label *label, acl_type_t type, struct acl *acl) 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(subj, obj)) 2322 return (EACCES); 2323 2324 return (0); 2325} 2326 2327static int 2328mac_biba_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 2329 struct label *vnodelabel, int attrnamespace, const char *name, 2330 struct uio *uio) 2331{ 2332 struct mac_biba *subj, *obj; 2333 2334 if (!mac_biba_enabled) 2335 return (0); 2336 2337 subj = SLOT(&cred->cr_label); 2338 obj = SLOT(vnodelabel); 2339 2340 if (!mac_biba_dominate_single(subj, obj)) 2341 return (EACCES); 2342 2343 /* XXX: protect the MAC EA in a special way? */ 2344 2345 return (0); 2346} 2347 2348static int 2349mac_biba_check_vnode_setflags(struct ucred *cred, struct vnode *vp, 2350 struct label *vnodelabel, u_long flags) 2351{ 2352 struct mac_biba *subj, *obj; 2353 2354 if (!mac_biba_enabled) 2355 return (0); 2356 2357 subj = SLOT(&cred->cr_label); 2358 obj = SLOT(vnodelabel); 2359 2360 if (!mac_biba_dominate_single(subj, obj)) 2361 return (EACCES); 2362 2363 return (0); 2364} 2365 2366static int 2367mac_biba_check_vnode_setmode(struct ucred *cred, struct vnode *vp, 2368 struct label *vnodelabel, mode_t mode) 2369{ 2370 struct mac_biba *subj, *obj; 2371 2372 if (!mac_biba_enabled) 2373 return (0); 2374 2375 subj = SLOT(&cred->cr_label); 2376 obj = SLOT(vnodelabel); 2377 2378 if (!mac_biba_dominate_single(subj, obj)) 2379 return (EACCES); 2380 2381 return (0); 2382} 2383 2384static int 2385mac_biba_check_vnode_setowner(struct ucred *cred, struct vnode *vp, 2386 struct label *vnodelabel, uid_t uid, gid_t gid) 2387{ 2388 struct mac_biba *subj, *obj; 2389 2390 if (!mac_biba_enabled) 2391 return (0); 2392 2393 subj = SLOT(&cred->cr_label); 2394 obj = SLOT(vnodelabel); 2395 2396 if (!mac_biba_dominate_single(subj, obj)) 2397 return (EACCES); 2398 2399 return (0); 2400} 2401 2402static int 2403mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 2404 struct label *vnodelabel, struct timespec atime, struct timespec mtime) 2405{ 2406 struct mac_biba *subj, *obj; 2407 2408 if (!mac_biba_enabled) 2409 return (0); 2410 2411 subj = SLOT(&cred->cr_label); 2412 obj = SLOT(vnodelabel); 2413 2414 if (!mac_biba_dominate_single(subj, obj)) 2415 return (EACCES); 2416 2417 return (0); 2418} 2419 2420static int 2421mac_biba_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 2422 struct vnode *vp, struct label *vnodelabel) 2423{ 2424 struct mac_biba *subj, *obj; 2425 2426 if (!mac_biba_enabled) 2427 return (0); 2428 2429 subj = SLOT(&active_cred->cr_label); 2430 obj = SLOT(vnodelabel); 2431 2432 if (!mac_biba_dominate_single(obj, subj)) 2433 return (EACCES); 2434 2435 return (0); 2436} 2437 2438static int 2439mac_biba_check_vnode_write(struct ucred *active_cred, 2440 struct ucred *file_cred, struct vnode *vp, struct label *label) 2441{ 2442 struct mac_biba *subj, *obj; 2443 2444 if (!mac_biba_enabled || !revocation_enabled) 2445 return (0); 2446 2447 subj = SLOT(&active_cred->cr_label); 2448 obj = SLOT(label); 2449 2450 if (!mac_biba_dominate_single(subj, obj)) 2451 return (EACCES); 2452 2453 return (0); 2454} 2455 2456static struct mac_policy_op_entry mac_biba_ops[] = 2457{ 2458 { MAC_DESTROY, 2459 (macop_t)mac_biba_destroy }, 2460 { MAC_INIT, 2461 (macop_t)mac_biba_init }, 2462 { MAC_INIT_BPFDESC_LABEL, 2463 (macop_t)mac_biba_init_label }, 2464 { MAC_INIT_CRED_LABEL, 2465 (macop_t)mac_biba_init_label }, 2466 { MAC_INIT_DEVFSDIRENT_LABEL, 2467 (macop_t)mac_biba_init_label }, 2468 { MAC_INIT_IFNET_LABEL, 2469 (macop_t)mac_biba_init_label }, 2470 { MAC_INIT_IPQ_LABEL, 2471 (macop_t)mac_biba_init_label }, 2472 { MAC_INIT_MBUF_LABEL, 2473 (macop_t)mac_biba_init_label_waitcheck }, 2474 { MAC_INIT_MOUNT_LABEL, 2475 (macop_t)mac_biba_init_label }, 2476 { MAC_INIT_MOUNT_FS_LABEL, 2477 (macop_t)mac_biba_init_label }, 2478 { MAC_INIT_PIPE_LABEL, 2479 (macop_t)mac_biba_init_label }, 2480 { MAC_INIT_SOCKET_LABEL, 2481 (macop_t)mac_biba_init_label_waitcheck }, 2482 { MAC_INIT_SOCKET_PEER_LABEL, 2483 (macop_t)mac_biba_init_label_waitcheck }, 2484 { MAC_INIT_VNODE_LABEL, 2485 (macop_t)mac_biba_init_label }, 2486 { MAC_DESTROY_BPFDESC_LABEL, 2487 (macop_t)mac_biba_destroy_label }, 2488 { MAC_DESTROY_CRED_LABEL, 2489 (macop_t)mac_biba_destroy_label }, 2490 { MAC_DESTROY_DEVFSDIRENT_LABEL, 2491 (macop_t)mac_biba_destroy_label }, 2492 { MAC_DESTROY_IFNET_LABEL, 2493 (macop_t)mac_biba_destroy_label }, 2494 { MAC_DESTROY_IPQ_LABEL, 2495 (macop_t)mac_biba_destroy_label }, 2496 { MAC_DESTROY_MBUF_LABEL, 2497 (macop_t)mac_biba_destroy_label }, 2498 { MAC_DESTROY_MOUNT_LABEL, 2499 (macop_t)mac_biba_destroy_label }, 2500 { MAC_DESTROY_MOUNT_FS_LABEL, 2501 (macop_t)mac_biba_destroy_label }, 2502 { MAC_DESTROY_PIPE_LABEL, 2503 (macop_t)mac_biba_destroy_label }, 2504 { MAC_DESTROY_SOCKET_LABEL, 2505 (macop_t)mac_biba_destroy_label }, 2506 { MAC_DESTROY_SOCKET_PEER_LABEL, 2507 (macop_t)mac_biba_destroy_label }, 2508 { MAC_DESTROY_VNODE_LABEL, 2509 (macop_t)mac_biba_destroy_label }, 2510 { MAC_COPY_PIPE_LABEL, 2511 (macop_t)mac_biba_copy_label }, 2512 { MAC_COPY_VNODE_LABEL, 2513 (macop_t)mac_biba_copy_label }, 2514 { MAC_EXTERNALIZE_CRED_LABEL, 2515 (macop_t)mac_biba_externalize_label }, 2516 { MAC_EXTERNALIZE_IFNET_LABEL, 2517 (macop_t)mac_biba_externalize_label }, 2518 { MAC_EXTERNALIZE_PIPE_LABEL, 2519 (macop_t)mac_biba_externalize_label }, 2520 { MAC_EXTERNALIZE_SOCKET_LABEL, 2521 (macop_t)mac_biba_externalize_label }, 2522 { MAC_EXTERNALIZE_SOCKET_PEER_LABEL, 2523 (macop_t)mac_biba_externalize_label }, 2524 { MAC_EXTERNALIZE_VNODE_LABEL, 2525 (macop_t)mac_biba_externalize_label }, 2526 { MAC_INTERNALIZE_CRED_LABEL, 2527 (macop_t)mac_biba_internalize_label }, 2528 { MAC_INTERNALIZE_IFNET_LABEL, 2529 (macop_t)mac_biba_internalize_label }, 2530 { MAC_INTERNALIZE_PIPE_LABEL, 2531 (macop_t)mac_biba_internalize_label }, 2532 { MAC_INTERNALIZE_SOCKET_LABEL, 2533 (macop_t)mac_biba_internalize_label }, 2534 { MAC_INTERNALIZE_VNODE_LABEL, 2535 (macop_t)mac_biba_internalize_label }, 2536 { MAC_CREATE_DEVFS_DEVICE, 2537 (macop_t)mac_biba_create_devfs_device }, 2538 { MAC_CREATE_DEVFS_DIRECTORY, 2539 (macop_t)mac_biba_create_devfs_directory }, 2540 { MAC_CREATE_DEVFS_SYMLINK, 2541 (macop_t)mac_biba_create_devfs_symlink }, 2542 { MAC_CREATE_DEVFS_VNODE, 2543 (macop_t)mac_biba_create_devfs_vnode }, 2544 { MAC_CREATE_MOUNT, 2545 (macop_t)mac_biba_create_mount }, 2546 { MAC_CREATE_ROOT_MOUNT, 2547 (macop_t)mac_biba_create_root_mount }, 2548 { MAC_RELABEL_VNODE, 2549 (macop_t)mac_biba_relabel_vnode }, 2550 { MAC_UPDATE_DEVFSDIRENT, 2551 (macop_t)mac_biba_update_devfsdirent }, 2552 { MAC_ASSOCIATE_VNODE_DEVFS, 2553 (macop_t)mac_biba_associate_vnode_devfs }, 2554 { MAC_ASSOCIATE_VNODE_EXTATTR, 2555 (macop_t)mac_biba_associate_vnode_extattr }, 2556 { MAC_ASSOCIATE_VNODE_SINGLELABEL, 2557 (macop_t)mac_biba_associate_vnode_singlelabel }, 2558 { MAC_CREATE_VNODE_EXTATTR, 2559 (macop_t)mac_biba_create_vnode_extattr }, 2560 { MAC_SETLABEL_VNODE_EXTATTR, 2561 (macop_t)mac_biba_setlabel_vnode_extattr }, 2562 { MAC_CREATE_MBUF_FROM_SOCKET, 2563 (macop_t)mac_biba_create_mbuf_from_socket }, 2564 { MAC_CREATE_PIPE, 2565 (macop_t)mac_biba_create_pipe }, 2566 { MAC_CREATE_SOCKET, 2567 (macop_t)mac_biba_create_socket }, 2568 { MAC_CREATE_SOCKET_FROM_SOCKET, 2569 (macop_t)mac_biba_create_socket_from_socket }, 2570 { MAC_RELABEL_PIPE, 2571 (macop_t)mac_biba_relabel_pipe }, 2572 { MAC_RELABEL_SOCKET, 2573 (macop_t)mac_biba_relabel_socket }, 2574 { MAC_SET_SOCKET_PEER_FROM_MBUF, 2575 (macop_t)mac_biba_set_socket_peer_from_mbuf }, 2576 { MAC_SET_SOCKET_PEER_FROM_SOCKET, 2577 (macop_t)mac_biba_set_socket_peer_from_socket }, 2578 { MAC_CREATE_BPFDESC, 2579 (macop_t)mac_biba_create_bpfdesc }, 2580 { MAC_CREATE_DATAGRAM_FROM_IPQ, 2581 (macop_t)mac_biba_create_datagram_from_ipq }, 2582 { MAC_CREATE_FRAGMENT, 2583 (macop_t)mac_biba_create_fragment }, 2584 { MAC_CREATE_IFNET, 2585 (macop_t)mac_biba_create_ifnet }, 2586 { MAC_CREATE_IPQ, 2587 (macop_t)mac_biba_create_ipq }, 2588 { MAC_CREATE_MBUF_FROM_MBUF, 2589 (macop_t)mac_biba_create_mbuf_from_mbuf }, 2590 { MAC_CREATE_MBUF_LINKLAYER, 2591 (macop_t)mac_biba_create_mbuf_linklayer }, 2592 { MAC_CREATE_MBUF_FROM_BPFDESC, 2593 (macop_t)mac_biba_create_mbuf_from_bpfdesc }, 2594 { MAC_CREATE_MBUF_FROM_IFNET, 2595 (macop_t)mac_biba_create_mbuf_from_ifnet }, 2596 { MAC_CREATE_MBUF_MULTICAST_ENCAP, 2597 (macop_t)mac_biba_create_mbuf_multicast_encap }, 2598 { MAC_CREATE_MBUF_NETLAYER, 2599 (macop_t)mac_biba_create_mbuf_netlayer }, 2600 { MAC_FRAGMENT_MATCH, 2601 (macop_t)mac_biba_fragment_match }, 2602 { MAC_RELABEL_IFNET, 2603 (macop_t)mac_biba_relabel_ifnet }, 2604 { MAC_UPDATE_IPQ, 2605 (macop_t)mac_biba_update_ipq }, 2606 { MAC_CREATE_CRED, 2607 (macop_t)mac_biba_create_cred }, 2608 { MAC_EXECVE_TRANSITION, 2609 (macop_t)mac_biba_execve_transition }, 2610 { MAC_EXECVE_WILL_TRANSITION, 2611 (macop_t)mac_biba_execve_will_transition }, 2612 { MAC_CREATE_PROC0, 2613 (macop_t)mac_biba_create_proc0 }, 2614 { MAC_CREATE_PROC1, 2615 (macop_t)mac_biba_create_proc1 }, 2616 { MAC_RELABEL_CRED, 2617 (macop_t)mac_biba_relabel_cred }, 2618 { MAC_CHECK_BPFDESC_RECEIVE, 2619 (macop_t)mac_biba_check_bpfdesc_receive }, 2620 { MAC_CHECK_CRED_RELABEL, 2621 (macop_t)mac_biba_check_cred_relabel }, 2622 { MAC_CHECK_CRED_VISIBLE, 2623 (macop_t)mac_biba_check_cred_visible }, 2624 { MAC_CHECK_IFNET_RELABEL, 2625 (macop_t)mac_biba_check_ifnet_relabel }, 2626 { MAC_CHECK_IFNET_TRANSMIT, 2627 (macop_t)mac_biba_check_ifnet_transmit }, 2628 { MAC_CHECK_MOUNT_STAT, 2629 (macop_t)mac_biba_check_mount_stat }, 2630 { MAC_CHECK_PIPE_IOCTL, 2631 (macop_t)mac_biba_check_pipe_ioctl }, 2632 { MAC_CHECK_PIPE_POLL, 2633 (macop_t)mac_biba_check_pipe_poll }, 2634 { MAC_CHECK_PIPE_READ, 2635 (macop_t)mac_biba_check_pipe_read }, 2636 { MAC_CHECK_PIPE_RELABEL, 2637 (macop_t)mac_biba_check_pipe_relabel }, 2638 { MAC_CHECK_PIPE_STAT, 2639 (macop_t)mac_biba_check_pipe_stat }, 2640 { MAC_CHECK_PIPE_WRITE, 2641 (macop_t)mac_biba_check_pipe_write }, 2642 { MAC_CHECK_PROC_DEBUG, 2643 (macop_t)mac_biba_check_proc_debug }, 2644 { MAC_CHECK_PROC_SCHED, 2645 (macop_t)mac_biba_check_proc_sched }, 2646 { MAC_CHECK_PROC_SIGNAL, 2647 (macop_t)mac_biba_check_proc_signal }, 2648 { MAC_CHECK_SOCKET_DELIVER, 2649 (macop_t)mac_biba_check_socket_deliver }, 2650 { MAC_CHECK_SOCKET_RELABEL, 2651 (macop_t)mac_biba_check_socket_relabel }, 2652 { MAC_CHECK_SOCKET_VISIBLE, 2653 (macop_t)mac_biba_check_socket_visible }, 2654 { MAC_CHECK_VNODE_ACCESS, 2655 (macop_t)mac_biba_check_vnode_open }, 2656 { MAC_CHECK_VNODE_CHDIR, 2657 (macop_t)mac_biba_check_vnode_chdir }, 2658 { MAC_CHECK_VNODE_CHROOT, 2659 (macop_t)mac_biba_check_vnode_chroot }, 2660 { MAC_CHECK_VNODE_CREATE, 2661 (macop_t)mac_biba_check_vnode_create }, 2662 { MAC_CHECK_VNODE_DELETE, 2663 (macop_t)mac_biba_check_vnode_delete }, 2664 { MAC_CHECK_VNODE_DELETEACL, 2665 (macop_t)mac_biba_check_vnode_deleteacl }, 2666 { MAC_CHECK_VNODE_EXEC, 2667 (macop_t)mac_biba_check_vnode_exec }, 2668 { MAC_CHECK_VNODE_GETACL, 2669 (macop_t)mac_biba_check_vnode_getacl }, 2670 { MAC_CHECK_VNODE_GETEXTATTR, 2671 (macop_t)mac_biba_check_vnode_getextattr }, 2672 { MAC_CHECK_VNODE_LINK, 2673 (macop_t)mac_biba_check_vnode_link }, 2674 { MAC_CHECK_VNODE_LOOKUP, 2675 (macop_t)mac_biba_check_vnode_lookup }, 2676 { MAC_CHECK_VNODE_MMAP, 2677 (macop_t)mac_biba_check_vnode_mmap }, 2678 { MAC_CHECK_VNODE_MPROTECT, 2679 (macop_t)mac_biba_check_vnode_mmap }, 2680 { MAC_CHECK_VNODE_OPEN, 2681 (macop_t)mac_biba_check_vnode_open }, 2682 { MAC_CHECK_VNODE_POLL, 2683 (macop_t)mac_biba_check_vnode_poll }, 2684 { MAC_CHECK_VNODE_READ, 2685 (macop_t)mac_biba_check_vnode_read }, 2686 { MAC_CHECK_VNODE_READDIR, 2687 (macop_t)mac_biba_check_vnode_readdir }, 2688 { MAC_CHECK_VNODE_READLINK, 2689 (macop_t)mac_biba_check_vnode_readlink }, 2690 { MAC_CHECK_VNODE_RELABEL, 2691 (macop_t)mac_biba_check_vnode_relabel }, 2692 { MAC_CHECK_VNODE_RENAME_FROM, 2693 (macop_t)mac_biba_check_vnode_rename_from }, 2694 { MAC_CHECK_VNODE_RENAME_TO, 2695 (macop_t)mac_biba_check_vnode_rename_to }, 2696 { MAC_CHECK_VNODE_REVOKE, 2697 (macop_t)mac_biba_check_vnode_revoke }, 2698 { MAC_CHECK_VNODE_SETACL, 2699 (macop_t)mac_biba_check_vnode_setacl }, 2700 { MAC_CHECK_VNODE_SETEXTATTR, 2701 (macop_t)mac_biba_check_vnode_setextattr }, 2702 { MAC_CHECK_VNODE_SETFLAGS, 2703 (macop_t)mac_biba_check_vnode_setflags }, 2704 { MAC_CHECK_VNODE_SETMODE, 2705 (macop_t)mac_biba_check_vnode_setmode }, 2706 { MAC_CHECK_VNODE_SETOWNER, 2707 (macop_t)mac_biba_check_vnode_setowner }, 2708 { MAC_CHECK_VNODE_SETUTIMES, 2709 (macop_t)mac_biba_check_vnode_setutimes }, 2710 { MAC_CHECK_VNODE_STAT, 2711 (macop_t)mac_biba_check_vnode_stat }, 2712 { MAC_CHECK_VNODE_WRITE, 2713 (macop_t)mac_biba_check_vnode_write }, 2714 { MAC_OP_LAST, NULL } 2715}; 2716 2717MAC_POLICY_SET(mac_biba_ops, trustedbsd_mac_biba, "TrustedBSD MAC/Biba", 2718 MPC_LOADTIME_FLAG_NOTLATE, &mac_biba_slot); 2719