1 /*- 2 * Copyright (c) 1999-2002, 2007-2009 Robert N. M. Watson 3 * Copyright (c) 2001-2005 Networks Associates Technology, Inc. 4 * Copyright (c) 2006 SPARTA, Inc. 5 * All rights reserved. 6 * 7 * This software was developed by Robert Watson for the TrustedBSD Project. 8 * 9 * This software was developed for the FreeBSD Project in part by NAI Labs, 10 * the Security Research Division of Network Associates, Inc. under 11 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 12 * CHATS research program. 13 * 14 * This software was enhanced by SPARTA ISSO under SPAWAR contract 15 * N66001-04-C-6019 ("SEFOS"). 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * $FreeBSD$ 39 */ 40 41 /* 42 * Developed by the TrustedBSD Project. 43 * 44 * Low-watermark floating label mandatory integrity policy. 45 */ 46 47 #include <sys/types.h> 48 #include <sys/param.h> 49 #include <sys/acl.h> 50 #include <sys/conf.h> 51 #include <sys/extattr.h> 52 #include <sys/kernel.h> 53 #include <sys/malloc.h> 54 #include <sys/mman.h> 55 #include <sys/mount.h> 56 #include <sys/priv.h> 57 #include <sys/proc.h> 58 #include <sys/sbuf.h> 59 #include <sys/systm.h> 60 #include <sys/sysproto.h> 61 #include <sys/sysent.h> 62 #include <sys/systm.h> 63 #include <sys/vnode.h> 64 #include <sys/file.h> 65 #include <sys/socket.h> 66 #include <sys/socketvar.h> 67 #include <sys/sx.h> 68 #include <sys/pipe.h> 69 #include <sys/sysctl.h> 70 #include <sys/syslog.h> 71 72 #include <fs/devfs/devfs.h> 73 74 #include <net/bpfdesc.h> 75 #include <net/if.h> 76 #include <net/if_types.h> 77 #include <net/if_var.h> 78 79 #include <netinet/in.h> 80 #include <netinet/in_pcb.h> 81 #include <netinet/ip_var.h> 82 83 #include <vm/vm.h> 84 85 #include <security/mac/mac_policy.h> 86 #include <security/mac/mac_framework.h> 87 #include <security/mac_lomac/mac_lomac.h> 88 89 struct mac_lomac_proc { 90 struct mac_lomac mac_lomac; 91 struct mtx mtx; 92 }; 93 94 SYSCTL_DECL(_security_mac); 95 96 static SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW, 0, 97 "TrustedBSD mac_lomac policy controls"); 98 99 static int lomac_label_size = sizeof(struct mac_lomac); 100 SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD, 101 &lomac_label_size, 0, "Size of struct mac_lomac"); 102 103 static int lomac_enabled = 1; 104 SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW, 105 &lomac_enabled, 0, "Enforce MAC/LOMAC policy"); 106 TUNABLE_INT("security.mac.lomac.enabled", &lomac_enabled); 107 108 static int destroyed_not_inited; 109 SYSCTL_INT(_security_mac_lomac, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, 110 &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); 111 112 static int trust_all_interfaces = 0; 113 SYSCTL_INT(_security_mac_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, 114 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC"); 115 TUNABLE_INT("security.mac.lomac.trust_all_interfaces", &trust_all_interfaces); 116 117 static char trusted_interfaces[128]; 118 SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RD, 119 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC"); 120 TUNABLE_STR("security.mac.lomac.trusted_interfaces", trusted_interfaces, 121 sizeof(trusted_interfaces)); 122 123 static int ptys_equal = 0; 124 SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RW, 125 &ptys_equal, 0, "Label pty devices as lomac/equal on create"); 126 TUNABLE_INT("security.mac.lomac.ptys_equal", &ptys_equal); 127 128 static int revocation_enabled = 1; 129 SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RW, 130 &revocation_enabled, 0, "Revoke access to objects on relabel"); 131 TUNABLE_INT("security.mac.lomac.revocation_enabled", &revocation_enabled); 132 133 static int lomac_slot; 134 #define SLOT(l) ((struct mac_lomac *)mac_label_get((l), lomac_slot)) 135 #define SLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val)) 136 #define PSLOT(l) ((struct mac_lomac_proc *) \ 137 mac_label_get((l), lomac_slot)) 138 #define PSLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val)) 139 140 static MALLOC_DEFINE(M_LOMAC, "mac_lomac_label", "MAC/LOMAC labels"); 141 142 static struct mac_lomac * 143 lomac_alloc(int flag) 144 { 145 struct mac_lomac *ml; 146 147 ml = malloc(sizeof(*ml), M_LOMAC, M_ZERO | flag); 148 149 return (ml); 150 } 151 152 static void 153 lomac_free(struct mac_lomac *ml) 154 { 155 156 if (ml != NULL) 157 free(ml, M_LOMAC); 158 else 159 atomic_add_int(&destroyed_not_inited, 1); 160 } 161 162 static int 163 lomac_atmostflags(struct mac_lomac *ml, int flags) 164 { 165 166 if ((ml->ml_flags & flags) != ml->ml_flags) 167 return (EINVAL); 168 return (0); 169 } 170 171 static int 172 lomac_dominate_element(struct mac_lomac_element *a, 173 struct mac_lomac_element *b) 174 { 175 176 switch (a->mle_type) { 177 case MAC_LOMAC_TYPE_EQUAL: 178 case MAC_LOMAC_TYPE_HIGH: 179 return (1); 180 181 case MAC_LOMAC_TYPE_LOW: 182 switch (b->mle_type) { 183 case MAC_LOMAC_TYPE_GRADE: 184 case MAC_LOMAC_TYPE_HIGH: 185 return (0); 186 187 case MAC_LOMAC_TYPE_EQUAL: 188 case MAC_LOMAC_TYPE_LOW: 189 return (1); 190 191 default: 192 panic("lomac_dominate_element: b->mle_type invalid"); 193 } 194 195 case MAC_LOMAC_TYPE_GRADE: 196 switch (b->mle_type) { 197 case MAC_LOMAC_TYPE_EQUAL: 198 case MAC_LOMAC_TYPE_LOW: 199 return (1); 200 201 case MAC_LOMAC_TYPE_HIGH: 202 return (0); 203 204 case MAC_LOMAC_TYPE_GRADE: 205 return (a->mle_grade >= b->mle_grade); 206 207 default: 208 panic("lomac_dominate_element: b->mle_type invalid"); 209 } 210 211 default: 212 panic("lomac_dominate_element: a->mle_type invalid"); 213 } 214 } 215 216 static int 217 lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb) 218 { 219 220 return (lomac_dominate_element(&rangeb->ml_rangehigh, 221 &rangea->ml_rangehigh) && 222 lomac_dominate_element(&rangea->ml_rangelow, 223 &rangeb->ml_rangelow)); 224 } 225 226 static int 227 lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range) 228 { 229 230 KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 231 ("lomac_single_in_range: a not single")); 232 KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, 233 ("lomac_single_in_range: b not range")); 234 235 return (lomac_dominate_element(&range->ml_rangehigh, 236 &single->ml_single) && lomac_dominate_element(&single->ml_single, 237 &range->ml_rangelow)); 238 } 239 240 static int 241 lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range) 242 { 243 244 KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0, 245 ("lomac_single_in_range: a not auxsingle")); 246 KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, 247 ("lomac_single_in_range: b not range")); 248 249 return (lomac_dominate_element(&range->ml_rangehigh, 250 &single->ml_auxsingle) && 251 lomac_dominate_element(&single->ml_auxsingle, 252 &range->ml_rangelow)); 253 } 254 255 static int 256 lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b) 257 { 258 KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 259 ("lomac_dominate_single: a not single")); 260 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 261 ("lomac_dominate_single: b not single")); 262 263 return (lomac_dominate_element(&a->ml_single, &b->ml_single)); 264 } 265 266 static int 267 lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b) 268 { 269 KASSERT((~a->ml_flags & 270 (MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0, 271 ("lomac_dominate_single: a not subject")); 272 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 273 ("lomac_dominate_single: b not single")); 274 275 return (lomac_dominate_element(&a->ml_rangehigh, &b->ml_single)); 276 } 277 278 static int 279 lomac_equal_element(struct mac_lomac_element *a, struct mac_lomac_element *b) 280 { 281 282 if (a->mle_type == MAC_LOMAC_TYPE_EQUAL || 283 b->mle_type == MAC_LOMAC_TYPE_EQUAL) 284 return (1); 285 286 return (a->mle_type == b->mle_type && a->mle_grade == b->mle_grade); 287 } 288 289 static int 290 lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b) 291 { 292 293 KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 294 ("lomac_equal_single: a not single")); 295 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 296 ("lomac_equal_single: b not single")); 297 298 return (lomac_equal_element(&a->ml_single, &b->ml_single)); 299 } 300 301 static int 302 lomac_contains_equal(struct mac_lomac *ml) 303 { 304 305 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) 306 if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL) 307 return (1); 308 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) 309 if (ml->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL) 310 return (1); 311 312 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { 313 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL) 314 return (1); 315 if (ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL) 316 return (1); 317 } 318 319 return (0); 320 } 321 322 static int 323 lomac_subject_privileged(struct mac_lomac *ml) 324 { 325 326 KASSERT((ml->ml_flags & MAC_LOMAC_FLAGS_BOTH) == 327 MAC_LOMAC_FLAGS_BOTH, 328 ("lomac_subject_privileged: subject doesn't have both labels")); 329 330 /* If the single is EQUAL, it's ok. */ 331 if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL) 332 return (0); 333 334 /* If either range endpoint is EQUAL, it's ok. */ 335 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL || 336 ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL) 337 return (0); 338 339 /* If the range is low-high, it's ok. */ 340 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW && 341 ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH) 342 return (0); 343 344 /* It's not ok. */ 345 return (EPERM); 346 } 347 348 static int 349 lomac_high_single(struct mac_lomac *ml) 350 { 351 352 KASSERT((ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 353 ("lomac_high_single: mac_lomac not single")); 354 355 return (ml->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH); 356 } 357 358 static int 359 lomac_valid(struct mac_lomac *ml) 360 { 361 362 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 363 switch (ml->ml_single.mle_type) { 364 case MAC_LOMAC_TYPE_GRADE: 365 case MAC_LOMAC_TYPE_EQUAL: 366 case MAC_LOMAC_TYPE_HIGH: 367 case MAC_LOMAC_TYPE_LOW: 368 break; 369 370 default: 371 return (EINVAL); 372 } 373 } else { 374 if (ml->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF) 375 return (EINVAL); 376 } 377 378 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) { 379 switch (ml->ml_auxsingle.mle_type) { 380 case MAC_LOMAC_TYPE_GRADE: 381 case MAC_LOMAC_TYPE_EQUAL: 382 case MAC_LOMAC_TYPE_HIGH: 383 case MAC_LOMAC_TYPE_LOW: 384 break; 385 386 default: 387 return (EINVAL); 388 } 389 } else { 390 if (ml->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF) 391 return (EINVAL); 392 } 393 394 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { 395 switch (ml->ml_rangelow.mle_type) { 396 case MAC_LOMAC_TYPE_GRADE: 397 case MAC_LOMAC_TYPE_EQUAL: 398 case MAC_LOMAC_TYPE_HIGH: 399 case MAC_LOMAC_TYPE_LOW: 400 break; 401 402 default: 403 return (EINVAL); 404 } 405 406 switch (ml->ml_rangehigh.mle_type) { 407 case MAC_LOMAC_TYPE_GRADE: 408 case MAC_LOMAC_TYPE_EQUAL: 409 case MAC_LOMAC_TYPE_HIGH: 410 case MAC_LOMAC_TYPE_LOW: 411 break; 412 413 default: 414 return (EINVAL); 415 } 416 if (!lomac_dominate_element(&ml->ml_rangehigh, 417 &ml->ml_rangelow)) 418 return (EINVAL); 419 } else { 420 if (ml->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF || 421 ml->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF) 422 return (EINVAL); 423 } 424 425 return (0); 426 } 427 428 static void 429 lomac_set_range(struct mac_lomac *ml, u_short typelow, u_short gradelow, 430 u_short typehigh, u_short gradehigh) 431 { 432 433 ml->ml_rangelow.mle_type = typelow; 434 ml->ml_rangelow.mle_grade = gradelow; 435 ml->ml_rangehigh.mle_type = typehigh; 436 ml->ml_rangehigh.mle_grade = gradehigh; 437 ml->ml_flags |= MAC_LOMAC_FLAG_RANGE; 438 } 439 440 static void 441 lomac_set_single(struct mac_lomac *ml, u_short type, u_short grade) 442 { 443 444 ml->ml_single.mle_type = type; 445 ml->ml_single.mle_grade = grade; 446 ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE; 447 } 448 449 static void 450 lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto) 451 { 452 453 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, 454 ("lomac_copy_range: labelfrom not range")); 455 456 labelto->ml_rangelow = labelfrom->ml_rangelow; 457 labelto->ml_rangehigh = labelfrom->ml_rangehigh; 458 labelto->ml_flags |= MAC_LOMAC_FLAG_RANGE; 459 } 460 461 static void 462 lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto) 463 { 464 465 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 466 ("lomac_copy_single: labelfrom not single")); 467 468 labelto->ml_single = labelfrom->ml_single; 469 labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE; 470 } 471 472 static void 473 lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto) 474 { 475 476 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0, 477 ("lomac_copy_auxsingle: labelfrom not auxsingle")); 478 479 labelto->ml_auxsingle = labelfrom->ml_auxsingle; 480 labelto->ml_flags |= MAC_LOMAC_FLAG_AUX; 481 } 482 483 static void 484 lomac_copy(struct mac_lomac *source, struct mac_lomac *dest) 485 { 486 487 if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE) 488 lomac_copy_single(source, dest); 489 if (source->ml_flags & MAC_LOMAC_FLAG_AUX) 490 lomac_copy_auxsingle(source, dest); 491 if (source->ml_flags & MAC_LOMAC_FLAG_RANGE) 492 lomac_copy_range(source, dest); 493 } 494 495 static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml); 496 497 static int 498 maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel, 499 const char *actionname, const char *objname, struct vnode *vp) 500 { 501 struct sbuf subjlabel_sb, subjtext_sb, objlabel_sb; 502 char *subjlabeltext, *objlabeltext, *subjtext; 503 struct mac_lomac cached_subjlabel; 504 struct mac_lomac_proc *subj; 505 struct vattr va; 506 struct proc *p; 507 pid_t pgid; 508 509 subj = PSLOT(curthread->td_proc->p_label); 510 511 p = curthread->td_proc; 512 mtx_lock(&subj->mtx); 513 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) { 514 /* 515 * Check to see if the pending demotion would be more or less 516 * severe than this one, and keep the more severe. This can 517 * only happen for a multi-threaded application. 518 */ 519 if (lomac_dominate_single(objlabel, &subj->mac_lomac)) { 520 mtx_unlock(&subj->mtx); 521 return (0); 522 } 523 } 524 bzero(&subj->mac_lomac, sizeof(subj->mac_lomac)); 525 /* 526 * Always demote the single label. 527 */ 528 lomac_copy_single(objlabel, &subj->mac_lomac); 529 /* 530 * Start with the original range, then minimize each side of the 531 * range to the point of not dominating the object. The high side 532 * will always be demoted, of course. 533 */ 534 lomac_copy_range(subjlabel, &subj->mac_lomac); 535 if (!lomac_dominate_element(&objlabel->ml_single, 536 &subj->mac_lomac.ml_rangelow)) 537 subj->mac_lomac.ml_rangelow = objlabel->ml_single; 538 subj->mac_lomac.ml_rangehigh = objlabel->ml_single; 539 subj->mac_lomac.ml_flags |= MAC_LOMAC_FLAG_UPDATE; 540 thread_lock(curthread); 541 curthread->td_flags |= TDF_ASTPENDING | TDF_MACPEND; 542 thread_unlock(curthread); 543 544 /* 545 * Avoid memory allocation while holding a mutex; cache the label. 546 */ 547 lomac_copy_single(&subj->mac_lomac, &cached_subjlabel); 548 mtx_unlock(&subj->mtx); 549 550 sbuf_new(&subjlabel_sb, NULL, 0, SBUF_AUTOEXTEND); 551 lomac_to_string(&subjlabel_sb, subjlabel); 552 sbuf_finish(&subjlabel_sb); 553 subjlabeltext = sbuf_data(&subjlabel_sb); 554 555 sbuf_new(&subjtext_sb, NULL, 0, SBUF_AUTOEXTEND); 556 lomac_to_string(&subjtext_sb, &subj->mac_lomac); 557 sbuf_finish(&subjtext_sb); 558 subjtext = sbuf_data(&subjtext_sb); 559 560 sbuf_new(&objlabel_sb, NULL, 0, SBUF_AUTOEXTEND); 561 lomac_to_string(&objlabel_sb, objlabel); 562 sbuf_finish(&objlabel_sb); 563 objlabeltext = sbuf_data(&objlabel_sb); 564 565 pgid = p->p_pgrp->pg_id; /* XXX could be stale? */ 566 if (vp != NULL && VOP_GETATTR(vp, &va, curthread->td_ucred) == 0) { 567 log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to" 568 " level %s after %s a level-%s %s (inode=%ld, " 569 "mountpount=%s)\n", 570 subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid, 571 p->p_comm, subjtext, actionname, objlabeltext, objname, 572 va.va_fileid, vp->v_mount->mnt_stat.f_mntonname); 573 } else { 574 log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to" 575 " level %s after %s a level-%s %s\n", 576 subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid, 577 p->p_comm, subjtext, actionname, objlabeltext, objname); 578 } 579 580 sbuf_delete(&subjlabel_sb); 581 sbuf_delete(&subjtext_sb); 582 sbuf_delete(&objlabel_sb); 583 584 return (0); 585 } 586 587 /* 588 * Relabel "to" to "from" only if "from" is a valid label (contains at least 589 * a single), as for a relabel operation which may or may not involve a 590 * relevant label. 591 */ 592 static void 593 try_relabel(struct mac_lomac *from, struct mac_lomac *to) 594 { 595 596 if (from->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 597 bzero(to, sizeof(*to)); 598 lomac_copy(from, to); 599 } 600 } 601 602 /* 603 * Policy module operations. 604 */ 605 static void 606 lomac_init(struct mac_policy_conf *conf) 607 { 608 609 } 610 611 /* 612 * Label operations. 613 */ 614 static void 615 lomac_init_label(struct label *label) 616 { 617 618 SLOT_SET(label, lomac_alloc(M_WAITOK)); 619 } 620 621 static int 622 lomac_init_label_waitcheck(struct label *label, int flag) 623 { 624 625 SLOT_SET(label, lomac_alloc(flag)); 626 if (SLOT(label) == NULL) 627 return (ENOMEM); 628 629 return (0); 630 } 631 632 static void 633 lomac_destroy_label(struct label *label) 634 { 635 636 lomac_free(SLOT(label)); 637 SLOT_SET(label, NULL); 638 } 639 640 static int 641 lomac_element_to_string(struct sbuf *sb, struct mac_lomac_element *element) 642 { 643 644 switch (element->mle_type) { 645 case MAC_LOMAC_TYPE_HIGH: 646 return (sbuf_printf(sb, "high")); 647 648 case MAC_LOMAC_TYPE_LOW: 649 return (sbuf_printf(sb, "low")); 650 651 case MAC_LOMAC_TYPE_EQUAL: 652 return (sbuf_printf(sb, "equal")); 653 654 case MAC_LOMAC_TYPE_GRADE: 655 return (sbuf_printf(sb, "%d", element->mle_grade)); 656 657 default: 658 panic("lomac_element_to_string: invalid type (%d)", 659 element->mle_type); 660 } 661 } 662 663 static int 664 lomac_to_string(struct sbuf *sb, struct mac_lomac *ml) 665 { 666 667 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 668 if (lomac_element_to_string(sb, &ml->ml_single) == -1) 669 return (EINVAL); 670 } 671 672 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) { 673 if (sbuf_putc(sb, '[') == -1) 674 return (EINVAL); 675 676 if (lomac_element_to_string(sb, &ml->ml_auxsingle) == -1) 677 return (EINVAL); 678 679 if (sbuf_putc(sb, ']') == -1) 680 return (EINVAL); 681 } 682 683 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { 684 if (sbuf_putc(sb, '(') == -1) 685 return (EINVAL); 686 687 if (lomac_element_to_string(sb, &ml->ml_rangelow) == -1) 688 return (EINVAL); 689 690 if (sbuf_putc(sb, '-') == -1) 691 return (EINVAL); 692 693 if (lomac_element_to_string(sb, &ml->ml_rangehigh) == -1) 694 return (EINVAL); 695 696 if (sbuf_putc(sb, ')') == -1) 697 return (EINVAL); 698 } 699 700 return (0); 701 } 702 703 static int 704 lomac_externalize_label(struct label *label, char *element_name, 705 struct sbuf *sb, int *claimed) 706 { 707 struct mac_lomac *ml; 708 709 if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0) 710 return (0); 711 712 (*claimed)++; 713 714 ml = SLOT(label); 715 716 return (lomac_to_string(sb, ml)); 717 } 718 719 static int 720 lomac_parse_element(struct mac_lomac_element *element, char *string) 721 { 722 723 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) { 724 element->mle_type = MAC_LOMAC_TYPE_HIGH; 725 element->mle_grade = MAC_LOMAC_TYPE_UNDEF; 726 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) { 727 element->mle_type = MAC_LOMAC_TYPE_LOW; 728 element->mle_grade = MAC_LOMAC_TYPE_UNDEF; 729 } else if (strcmp(string, "equal") == 0 || 730 strcmp(string, "eq") == 0) { 731 element->mle_type = MAC_LOMAC_TYPE_EQUAL; 732 element->mle_grade = MAC_LOMAC_TYPE_UNDEF; 733 } else { 734 char *p0, *p1; 735 int d; 736 737 p0 = string; 738 d = strtol(p0, &p1, 10); 739 740 if (d < 0 || d > 65535) 741 return (EINVAL); 742 element->mle_type = MAC_LOMAC_TYPE_GRADE; 743 element->mle_grade = d; 744 745 if (p1 == p0 || *p1 != '\0') 746 return (EINVAL); 747 } 748 749 return (0); 750 } 751 752 /* 753 * Note: destructively consumes the string, make a local copy before calling 754 * if that's a problem. 755 */ 756 static int 757 lomac_parse(struct mac_lomac *ml, char *string) 758 { 759 char *range, *rangeend, *rangehigh, *rangelow, *single, *auxsingle, 760 *auxsingleend; 761 int error; 762 763 /* Do we have a range? */ 764 single = string; 765 range = strchr(string, '('); 766 if (range == single) 767 single = NULL; 768 auxsingle = strchr(string, '['); 769 if (auxsingle == single) 770 single = NULL; 771 if (range != NULL && auxsingle != NULL) 772 return (EINVAL); 773 rangelow = rangehigh = NULL; 774 if (range != NULL) { 775 /* Nul terminate the end of the single string. */ 776 *range = '\0'; 777 range++; 778 rangelow = range; 779 rangehigh = strchr(rangelow, '-'); 780 if (rangehigh == NULL) 781 return (EINVAL); 782 rangehigh++; 783 if (*rangelow == '\0' || *rangehigh == '\0') 784 return (EINVAL); 785 rangeend = strchr(rangehigh, ')'); 786 if (rangeend == NULL) 787 return (EINVAL); 788 if (*(rangeend + 1) != '\0') 789 return (EINVAL); 790 /* Nul terminate the ends of the ranges. */ 791 *(rangehigh - 1) = '\0'; 792 *rangeend = '\0'; 793 } 794 KASSERT((rangelow != NULL && rangehigh != NULL) || 795 (rangelow == NULL && rangehigh == NULL), 796 ("lomac_internalize_label: range mismatch")); 797 if (auxsingle != NULL) { 798 /* Nul terminate the end of the single string. */ 799 *auxsingle = '\0'; 800 auxsingle++; 801 auxsingleend = strchr(auxsingle, ']'); 802 if (auxsingleend == NULL) 803 return (EINVAL); 804 if (*(auxsingleend + 1) != '\0') 805 return (EINVAL); 806 /* Nul terminate the end of the auxsingle. */ 807 *auxsingleend = '\0'; 808 } 809 810 bzero(ml, sizeof(*ml)); 811 if (single != NULL) { 812 error = lomac_parse_element(&ml->ml_single, single); 813 if (error) 814 return (error); 815 ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE; 816 } 817 818 if (auxsingle != NULL) { 819 error = lomac_parse_element(&ml->ml_auxsingle, auxsingle); 820 if (error) 821 return (error); 822 ml->ml_flags |= MAC_LOMAC_FLAG_AUX; 823 } 824 825 if (rangelow != NULL) { 826 error = lomac_parse_element(&ml->ml_rangelow, rangelow); 827 if (error) 828 return (error); 829 error = lomac_parse_element(&ml->ml_rangehigh, rangehigh); 830 if (error) 831 return (error); 832 ml->ml_flags |= MAC_LOMAC_FLAG_RANGE; 833 } 834 835 error = lomac_valid(ml); 836 if (error) 837 return (error); 838 839 return (0); 840 } 841 842 static int 843 lomac_internalize_label(struct label *label, char *element_name, 844 char *element_data, int *claimed) 845 { 846 struct mac_lomac *ml, ml_temp; 847 int error; 848 849 if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0) 850 return (0); 851 852 (*claimed)++; 853 854 error = lomac_parse(&ml_temp, element_data); 855 if (error) 856 return (error); 857 858 ml = SLOT(label); 859 *ml = ml_temp; 860 861 return (0); 862 } 863 864 static void 865 lomac_copy_label(struct label *src, struct label *dest) 866 { 867 868 *SLOT(dest) = *SLOT(src); 869 } 870 871 /* 872 * Object-specific entry point implementations are sorted alphabetically by 873 * object type name and then by operation. 874 */ 875 static int 876 lomac_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 877 struct ifnet *ifp, struct label *ifplabel) 878 { 879 struct mac_lomac *a, *b; 880 881 if (!lomac_enabled) 882 return (0); 883 884 a = SLOT(dlabel); 885 b = SLOT(ifplabel); 886 887 if (lomac_equal_single(a, b)) 888 return (0); 889 return (EACCES); 890 } 891 892 static void 893 lomac_bpfdesc_create(struct ucred *cred, struct bpf_d *d, 894 struct label *dlabel) 895 { 896 struct mac_lomac *source, *dest; 897 898 source = SLOT(cred->cr_label); 899 dest = SLOT(dlabel); 900 901 lomac_copy_single(source, dest); 902 } 903 904 static void 905 lomac_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, 906 struct mbuf *m, struct label *mlabel) 907 { 908 struct mac_lomac *source, *dest; 909 910 source = SLOT(dlabel); 911 dest = SLOT(mlabel); 912 913 lomac_copy_single(source, dest); 914 } 915 916 static int 917 lomac_cred_check_relabel(struct ucred *cred, struct label *newlabel) 918 { 919 struct mac_lomac *subj, *new; 920 int error; 921 922 subj = SLOT(cred->cr_label); 923 new = SLOT(newlabel); 924 925 /* 926 * If there is a LOMAC label update for the credential, it may be an 927 * update of the single, range, or both. 928 */ 929 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH); 930 if (error) 931 return (error); 932 933 /* 934 * If the LOMAC label is to be changed, authorize as appropriate. 935 */ 936 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) { 937 /* 938 * Fill in the missing parts from the previous label. 939 */ 940 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 941 lomac_copy_single(subj, new); 942 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0) 943 lomac_copy_range(subj, new); 944 945 /* 946 * To change the LOMAC range on a credential, the new range 947 * label must be in the current range. 948 */ 949 if (!lomac_range_in_range(new, subj)) 950 return (EPERM); 951 952 /* 953 * To change the LOMAC single label on a credential, the new 954 * single label must be in the new range. Implicitly from 955 * the previous check, the new single is in the old range. 956 */ 957 if (!lomac_single_in_range(new, new)) 958 return (EPERM); 959 960 /* 961 * To have EQUAL in any component of the new credential LOMAC 962 * label, the subject must already have EQUAL in their label. 963 */ 964 if (lomac_contains_equal(new)) { 965 error = lomac_subject_privileged(subj); 966 if (error) 967 return (error); 968 } 969 970 /* 971 * XXXMAC: Additional consistency tests regarding the single 972 * and range of the new label might be performed here. 973 */ 974 } 975 976 return (0); 977 } 978 979 static int 980 lomac_cred_check_visible(struct ucred *cr1, struct ucred *cr2) 981 { 982 struct mac_lomac *subj, *obj; 983 984 if (!lomac_enabled) 985 return (0); 986 987 subj = SLOT(cr1->cr_label); 988 obj = SLOT(cr2->cr_label); 989 990 /* XXX: range */ 991 if (!lomac_dominate_single(obj, subj)) 992 return (ESRCH); 993 994 return (0); 995 } 996 997 static void 998 lomac_cred_create_init(struct ucred *cred) 999 { 1000 struct mac_lomac *dest; 1001 1002 dest = SLOT(cred->cr_label); 1003 1004 lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0); 1005 lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0); 1006 } 1007 1008 static void 1009 lomac_cred_create_swapper(struct ucred *cred) 1010 { 1011 struct mac_lomac *dest; 1012 1013 dest = SLOT(cred->cr_label); 1014 1015 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1016 lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0); 1017 } 1018 1019 static void 1020 lomac_cred_relabel(struct ucred *cred, struct label *newlabel) 1021 { 1022 struct mac_lomac *source, *dest; 1023 1024 source = SLOT(newlabel); 1025 dest = SLOT(cred->cr_label); 1026 1027 try_relabel(source, dest); 1028 } 1029 1030 static void 1031 lomac_devfs_create_device(struct ucred *cred, struct mount *mp, 1032 struct cdev *dev, struct devfs_dirent *de, struct label *delabel) 1033 { 1034 struct mac_lomac *ml; 1035 const char *dn; 1036 int lomac_type; 1037 1038 ml = SLOT(delabel); 1039 dn = devtoname(dev); 1040 if (strcmp(dn, "null") == 0 || 1041 strcmp(dn, "zero") == 0 || 1042 strcmp(dn, "random") == 0 || 1043 strncmp(dn, "fd/", strlen("fd/")) == 0 || 1044 strncmp(dn, "ttyv", strlen("ttyv")) == 0) 1045 lomac_type = MAC_LOMAC_TYPE_EQUAL; 1046 else if (ptys_equal && 1047 (strncmp(dn, "ttyp", strlen("ttyp")) == 0 || 1048 strncmp(dn, "pts/", strlen("pts/")) == 0 || 1049 strncmp(dn, "ptyp", strlen("ptyp")) == 0)) 1050 lomac_type = MAC_LOMAC_TYPE_EQUAL; 1051 else 1052 lomac_type = MAC_LOMAC_TYPE_HIGH; 1053 lomac_set_single(ml, lomac_type, 0); 1054 } 1055 1056 static void 1057 lomac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 1058 struct devfs_dirent *de, struct label *delabel) 1059 { 1060 struct mac_lomac *ml; 1061 1062 ml = SLOT(delabel); 1063 lomac_set_single(ml, MAC_LOMAC_TYPE_HIGH, 0); 1064 } 1065 1066 static void 1067 lomac_devfs_create_symlink(struct ucred *cred, struct mount *mp, 1068 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 1069 struct label *delabel) 1070 { 1071 struct mac_lomac *source, *dest; 1072 1073 source = SLOT(cred->cr_label); 1074 dest = SLOT(delabel); 1075 1076 lomac_copy_single(source, dest); 1077 } 1078 1079 static void 1080 lomac_devfs_update(struct mount *mp, struct devfs_dirent *de, 1081 struct label *delabel, struct vnode *vp, struct label *vplabel) 1082 { 1083 struct mac_lomac *source, *dest; 1084 1085 source = SLOT(vplabel); 1086 dest = SLOT(delabel); 1087 1088 lomac_copy(source, dest); 1089 } 1090 1091 static void 1092 lomac_devfs_vnode_associate(struct mount *mp, struct label *mplabel, 1093 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 1094 struct label *vplabel) 1095 { 1096 struct mac_lomac *source, *dest; 1097 1098 source = SLOT(delabel); 1099 dest = SLOT(vplabel); 1100 1101 lomac_copy_single(source, dest); 1102 } 1103 1104 static int 1105 lomac_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1106 struct label *ifplabel, struct label *newlabel) 1107 { 1108 struct mac_lomac *subj, *new; 1109 int error; 1110 1111 subj = SLOT(cred->cr_label); 1112 new = SLOT(newlabel); 1113 1114 /* 1115 * If there is a LOMAC label update for the interface, it may be an 1116 * update of the single, range, or both. 1117 */ 1118 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH); 1119 if (error) 1120 return (error); 1121 1122 /* 1123 * Relabling network interfaces requires LOMAC privilege. 1124 */ 1125 error = lomac_subject_privileged(subj); 1126 if (error) 1127 return (error); 1128 1129 /* 1130 * If the LOMAC label is to be changed, authorize as appropriate. 1131 */ 1132 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) { 1133 /* 1134 * Fill in the missing parts from the previous label. 1135 */ 1136 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 1137 lomac_copy_single(subj, new); 1138 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0) 1139 lomac_copy_range(subj, new); 1140 1141 /* 1142 * Rely on the traditional superuser status for the LOMAC 1143 * interface relabel requirements. XXXMAC: This will go 1144 * away. 1145 * 1146 * XXXRW: This is also redundant to a higher layer check. 1147 */ 1148 error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 0); 1149 if (error) 1150 return (EPERM); 1151 1152 /* 1153 * XXXMAC: Additional consistency tests regarding the single 1154 * and the range of the new label might be performed here. 1155 */ 1156 } 1157 1158 return (0); 1159 } 1160 1161 static int 1162 lomac_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1163 struct mbuf *m, struct label *mlabel) 1164 { 1165 struct mac_lomac *p, *i; 1166 1167 if (!lomac_enabled) 1168 return (0); 1169 1170 p = SLOT(mlabel); 1171 i = SLOT(ifplabel); 1172 1173 return (lomac_single_in_range(p, i) ? 0 : EACCES); 1174 } 1175 1176 static void 1177 lomac_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1178 { 1179 char tifname[IFNAMSIZ], *p, *q; 1180 char tiflist[sizeof(trusted_interfaces)]; 1181 struct mac_lomac *dest; 1182 int len, grade; 1183 1184 dest = SLOT(ifplabel); 1185 1186 if (ifp->if_type == IFT_LOOP) { 1187 grade = MAC_LOMAC_TYPE_EQUAL; 1188 goto set; 1189 } 1190 1191 if (trust_all_interfaces) { 1192 grade = MAC_LOMAC_TYPE_HIGH; 1193 goto set; 1194 } 1195 1196 grade = MAC_LOMAC_TYPE_LOW; 1197 1198 if (trusted_interfaces[0] == '\0' || 1199 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1200 goto set; 1201 1202 bzero(tiflist, sizeof(tiflist)); 1203 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1204 if(*p != ' ' && *p != '\t') 1205 *q = *p; 1206 1207 for (p = q = tiflist;; p++) { 1208 if (*p == ',' || *p == '\0') { 1209 len = p - q; 1210 if (len < IFNAMSIZ) { 1211 bzero(tifname, sizeof(tifname)); 1212 bcopy(q, tifname, len); 1213 if (strcmp(tifname, ifp->if_xname) == 0) { 1214 grade = MAC_LOMAC_TYPE_HIGH; 1215 break; 1216 } 1217 } 1218 else { 1219 *p = '\0'; 1220 printf("MAC/LOMAC warning: interface name " 1221 "\"%s\" is too long (must be < %d)\n", 1222 q, IFNAMSIZ); 1223 } 1224 if (*p == '\0') 1225 break; 1226 q = p + 1; 1227 } 1228 } 1229 set: 1230 lomac_set_single(dest, grade, 0); 1231 lomac_set_range(dest, grade, 0, grade, 0); 1232 } 1233 1234 static void 1235 lomac_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1236 struct mbuf *m, struct label *mlabel) 1237 { 1238 struct mac_lomac *source, *dest; 1239 1240 source = SLOT(ifplabel); 1241 dest = SLOT(mlabel); 1242 1243 lomac_copy_single(source, dest); 1244 } 1245 1246 static void 1247 lomac_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1248 struct label *ifplabel, struct label *newlabel) 1249 { 1250 struct mac_lomac *source, *dest; 1251 1252 source = SLOT(newlabel); 1253 dest = SLOT(ifplabel); 1254 1255 try_relabel(source, dest); 1256 } 1257 1258 static int 1259 lomac_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1260 struct mbuf *m, struct label *mlabel) 1261 { 1262 struct mac_lomac *p, *i; 1263 1264 if (!lomac_enabled) 1265 return (0); 1266 1267 p = SLOT(mlabel); 1268 i = SLOT(inplabel); 1269 1270 return (lomac_equal_single(p, i) ? 0 : EACCES); 1271 } 1272 1273 static int 1274 lomac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, 1275 struct label *inplabel) 1276 { 1277 struct mac_lomac *subj, *obj; 1278 1279 if (!lomac_enabled) 1280 return (0); 1281 1282 subj = SLOT(cred->cr_label); 1283 obj = SLOT(inplabel); 1284 1285 if (!lomac_dominate_single(obj, subj)) 1286 return (ENOENT); 1287 1288 return (0); 1289 } 1290 1291 static void 1292 lomac_inpcb_create(struct socket *so, struct label *solabel, 1293 struct inpcb *inp, struct label *inplabel) 1294 { 1295 struct mac_lomac *source, *dest; 1296 1297 source = SLOT(solabel); 1298 dest = SLOT(inplabel); 1299 1300 lomac_copy_single(source, dest); 1301 } 1302 1303 static void 1304 lomac_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1305 struct mbuf *m, struct label *mlabel) 1306 { 1307 struct mac_lomac *source, *dest; 1308 1309 source = SLOT(inplabel); 1310 dest = SLOT(mlabel); 1311 1312 lomac_copy_single(source, dest); 1313 } 1314 1315 static void 1316 lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1317 struct inpcb *inp, struct label *inplabel) 1318 { 1319 struct mac_lomac *source, *dest; 1320 1321 SOCK_LOCK_ASSERT(so); 1322 1323 source = SLOT(solabel); 1324 dest = SLOT(inplabel); 1325 1326 lomac_copy_single(source, dest); 1327 } 1328 1329 static void 1330 lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1331 struct label *q6label) 1332 { 1333 struct mac_lomac *source, *dest; 1334 1335 source = SLOT(mlabel); 1336 dest = SLOT(q6label); 1337 1338 lomac_copy_single(source, dest); 1339 } 1340 1341 static int 1342 lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1343 struct label *q6label) 1344 { 1345 struct mac_lomac *a, *b; 1346 1347 a = SLOT(q6label); 1348 b = SLOT(mlabel); 1349 1350 return (lomac_equal_single(a, b)); 1351 } 1352 1353 static void 1354 lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, 1355 struct label *mlabel) 1356 { 1357 struct mac_lomac *source, *dest; 1358 1359 source = SLOT(q6label); 1360 dest = SLOT(mlabel); 1361 1362 /* Just use the head, since we require them all to match. */ 1363 lomac_copy_single(source, dest); 1364 } 1365 1366 static void 1367 lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1368 struct label *q6label) 1369 { 1370 1371 /* NOOP: we only accept matching labels, so no need to update */ 1372 } 1373 1374 static void 1375 lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, 1376 struct label *qlabel) 1377 { 1378 struct mac_lomac *source, *dest; 1379 1380 source = SLOT(mlabel); 1381 dest = SLOT(qlabel); 1382 1383 lomac_copy_single(source, dest); 1384 } 1385 1386 static int 1387 lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, 1388 struct label *qlabel) 1389 { 1390 struct mac_lomac *a, *b; 1391 1392 a = SLOT(qlabel); 1393 b = SLOT(mlabel); 1394 1395 return (lomac_equal_single(a, b)); 1396 } 1397 1398 static void 1399 lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, 1400 struct label *mlabel) 1401 { 1402 struct mac_lomac *source, *dest; 1403 1404 source = SLOT(qlabel); 1405 dest = SLOT(mlabel); 1406 1407 /* Just use the head, since we require them all to match. */ 1408 lomac_copy_single(source, dest); 1409 } 1410 1411 static void 1412 lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, 1413 struct label *qlabel) 1414 { 1415 1416 /* NOOP: we only accept matching labels, so no need to update */ 1417 } 1418 1419 static int 1420 lomac_kld_check_load(struct ucred *cred, struct vnode *vp, 1421 struct label *vplabel) 1422 { 1423 struct mac_lomac *subj, *obj; 1424 1425 if (!lomac_enabled) 1426 return (0); 1427 1428 subj = SLOT(cred->cr_label); 1429 obj = SLOT(vplabel); 1430 1431 if (lomac_subject_privileged(subj)) 1432 return (EPERM); 1433 1434 if (!lomac_high_single(obj)) 1435 return (EACCES); 1436 1437 return (0); 1438 } 1439 1440 static void 1441 lomac_mount_create(struct ucred *cred, struct mount *mp, 1442 struct label *mplabel) 1443 { 1444 struct mac_lomac *source, *dest; 1445 1446 source = SLOT(cred->cr_label); 1447 dest = SLOT(mplabel); 1448 lomac_copy_single(source, dest); 1449 } 1450 1451 static void 1452 lomac_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1453 struct mbuf *m, struct label *mlabel) 1454 { 1455 struct mac_lomac *dest; 1456 1457 dest = SLOT(mlabel); 1458 1459 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1460 } 1461 1462 static void 1463 lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1464 struct mbuf *m, struct label *mlabel) 1465 { 1466 struct mac_lomac *dest; 1467 1468 dest = SLOT(mlabel); 1469 1470 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1471 } 1472 1473 static void 1474 lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1475 struct mbuf *msend, struct label *msendlabel) 1476 { 1477 struct mac_lomac *source, *dest; 1478 1479 source = SLOT(mrecvlabel); 1480 dest = SLOT(msendlabel); 1481 1482 lomac_copy_single(source, dest); 1483 } 1484 1485 static void 1486 lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1487 { 1488 struct mac_lomac *dest; 1489 1490 dest = SLOT(mlabel); 1491 1492 /* XXX: where is the label for the firewall really comming from? */ 1493 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1494 } 1495 1496 static void 1497 lomac_netinet_fragment(struct mbuf *m, struct label *mlabel, 1498 struct mbuf *frag, struct label *fraglabel) 1499 { 1500 struct mac_lomac *source, *dest; 1501 1502 source = SLOT(mlabel); 1503 dest = SLOT(fraglabel); 1504 1505 lomac_copy_single(source, dest); 1506 } 1507 1508 static void 1509 lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1510 struct mbuf *msend, struct label *msendlabel) 1511 { 1512 struct mac_lomac *source, *dest; 1513 1514 source = SLOT(mrecvlabel); 1515 dest = SLOT(msendlabel); 1516 1517 lomac_copy_single(source, dest); 1518 } 1519 1520 static void 1521 lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1522 struct mbuf *m, struct label *mlabel) 1523 { 1524 struct mac_lomac *dest; 1525 1526 dest = SLOT(mlabel); 1527 1528 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1529 } 1530 1531 static void 1532 lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1533 struct mbuf *m, struct label *mlabel) 1534 { 1535 struct mac_lomac *dest; 1536 1537 dest = SLOT(mlabel); 1538 1539 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1540 } 1541 1542 static int 1543 lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1544 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1545 { 1546 1547 if (!lomac_enabled) 1548 return (0); 1549 1550 /* XXX: This will be implemented soon... */ 1551 1552 return (0); 1553 } 1554 1555 static int 1556 lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1557 struct label *pplabel) 1558 { 1559 struct mac_lomac *subj, *obj; 1560 1561 if (!lomac_enabled) 1562 return (0); 1563 1564 subj = SLOT(cred->cr_label); 1565 obj = SLOT(pplabel); 1566 1567 if (!lomac_dominate_single(obj, subj)) 1568 return (maybe_demote(subj, obj, "reading", "pipe", NULL)); 1569 1570 return (0); 1571 } 1572 1573 static int 1574 lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1575 struct label *pplabel, struct label *newlabel) 1576 { 1577 struct mac_lomac *subj, *obj, *new; 1578 int error; 1579 1580 new = SLOT(newlabel); 1581 subj = SLOT(cred->cr_label); 1582 obj = SLOT(pplabel); 1583 1584 /* 1585 * If there is a LOMAC label update for a pipe, it must be a single 1586 * update. 1587 */ 1588 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); 1589 if (error) 1590 return (error); 1591 1592 /* 1593 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must 1594 * authorize the relabel. 1595 */ 1596 if (!lomac_single_in_range(obj, subj)) 1597 return (EPERM); 1598 1599 /* 1600 * If the LOMAC label is to be changed, authorize as appropriate. 1601 */ 1602 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 1603 /* 1604 * To change the LOMAC label on a pipe, the new pipe label 1605 * must be in the subject range. 1606 */ 1607 if (!lomac_single_in_range(new, subj)) 1608 return (EPERM); 1609 1610 /* 1611 * To change the LOMAC label on a pipe to be EQUAL, the 1612 * subject must have appropriate privilege. 1613 */ 1614 if (lomac_contains_equal(new)) { 1615 error = lomac_subject_privileged(subj); 1616 if (error) 1617 return (error); 1618 } 1619 } 1620 1621 return (0); 1622 } 1623 1624 static int 1625 lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1626 struct label *pplabel) 1627 { 1628 struct mac_lomac *subj, *obj; 1629 1630 if (!lomac_enabled) 1631 return (0); 1632 1633 subj = SLOT(cred->cr_label); 1634 obj = SLOT(pplabel); 1635 1636 if (!lomac_subject_dominate(subj, obj)) 1637 return (EACCES); 1638 1639 return (0); 1640 } 1641 1642 static void 1643 lomac_pipe_create(struct ucred *cred, struct pipepair *pp, 1644 struct label *pplabel) 1645 { 1646 struct mac_lomac *source, *dest; 1647 1648 source = SLOT(cred->cr_label); 1649 dest = SLOT(pplabel); 1650 1651 lomac_copy_single(source, dest); 1652 } 1653 1654 static void 1655 lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1656 struct label *pplabel, struct label *newlabel) 1657 { 1658 struct mac_lomac *source, *dest; 1659 1660 source = SLOT(newlabel); 1661 dest = SLOT(pplabel); 1662 1663 try_relabel(source, dest); 1664 } 1665 1666 /* 1667 * Some system privileges are allowed regardless of integrity grade; others 1668 * are allowed only when running with privilege with respect to the LOMAC 1669 * policy as they might otherwise allow bypassing of the integrity policy. 1670 */ 1671 static int 1672 lomac_priv_check(struct ucred *cred, int priv) 1673 { 1674 struct mac_lomac *subj; 1675 int error; 1676 1677 if (!lomac_enabled) 1678 return (0); 1679 1680 /* 1681 * Exempt only specific privileges from the LOMAC integrity policy. 1682 */ 1683 switch (priv) { 1684 case PRIV_KTRACE: 1685 case PRIV_MSGBUF: 1686 1687 /* 1688 * Allow processes to manipulate basic process audit properties, and 1689 * to submit audit records. 1690 */ 1691 case PRIV_AUDIT_GETAUDIT: 1692 case PRIV_AUDIT_SETAUDIT: 1693 case PRIV_AUDIT_SUBMIT: 1694 1695 /* 1696 * Allow processes to manipulate their regular UNIX credentials. 1697 */ 1698 case PRIV_CRED_SETUID: 1699 case PRIV_CRED_SETEUID: 1700 case PRIV_CRED_SETGID: 1701 case PRIV_CRED_SETEGID: 1702 case PRIV_CRED_SETGROUPS: 1703 case PRIV_CRED_SETREUID: 1704 case PRIV_CRED_SETREGID: 1705 case PRIV_CRED_SETRESUID: 1706 case PRIV_CRED_SETRESGID: 1707 1708 /* 1709 * Allow processes to perform system monitoring. 1710 */ 1711 case PRIV_SEEOTHERGIDS: 1712 case PRIV_SEEOTHERUIDS: 1713 break; 1714 1715 /* 1716 * Allow access to general process debugging facilities. We 1717 * separately control debugging based on MAC label. 1718 */ 1719 case PRIV_DEBUG_DIFFCRED: 1720 case PRIV_DEBUG_SUGID: 1721 case PRIV_DEBUG_UNPRIV: 1722 1723 /* 1724 * Allow manipulating jails. 1725 */ 1726 case PRIV_JAIL_ATTACH: 1727 1728 /* 1729 * Allow privilege with respect to the Partition policy, but not the 1730 * Privs policy. 1731 */ 1732 case PRIV_MAC_PARTITION: 1733 1734 /* 1735 * Allow privilege with respect to process resource limits and login 1736 * context. 1737 */ 1738 case PRIV_PROC_LIMIT: 1739 case PRIV_PROC_SETLOGIN: 1740 case PRIV_PROC_SETRLIMIT: 1741 1742 /* 1743 * Allow System V and POSIX IPC privileges. 1744 */ 1745 case PRIV_IPC_READ: 1746 case PRIV_IPC_WRITE: 1747 case PRIV_IPC_ADMIN: 1748 case PRIV_IPC_MSGSIZE: 1749 case PRIV_MQ_ADMIN: 1750 1751 /* 1752 * Allow certain scheduler manipulations -- possibly this should be 1753 * controlled by more fine-grained policy, as potentially low 1754 * integrity processes can deny CPU to higher integrity ones. 1755 */ 1756 case PRIV_SCHED_DIFFCRED: 1757 case PRIV_SCHED_SETPRIORITY: 1758 case PRIV_SCHED_RTPRIO: 1759 case PRIV_SCHED_SETPOLICY: 1760 case PRIV_SCHED_SET: 1761 case PRIV_SCHED_SETPARAM: 1762 1763 /* 1764 * More IPC privileges. 1765 */ 1766 case PRIV_SEM_WRITE: 1767 1768 /* 1769 * Allow signaling privileges subject to integrity policy. 1770 */ 1771 case PRIV_SIGNAL_DIFFCRED: 1772 case PRIV_SIGNAL_SUGID: 1773 1774 /* 1775 * Allow access to only limited sysctls from lower integrity levels; 1776 * piggy-back on the Jail definition. 1777 */ 1778 case PRIV_SYSCTL_WRITEJAIL: 1779 1780 /* 1781 * Allow TTY-based privileges, subject to general device access using 1782 * labels on TTY device nodes, but not console privilege. 1783 */ 1784 case PRIV_TTY_DRAINWAIT: 1785 case PRIV_TTY_DTRWAIT: 1786 case PRIV_TTY_EXCLUSIVE: 1787 case PRIV_TTY_STI: 1788 case PRIV_TTY_SETA: 1789 1790 /* 1791 * Grant most VFS privileges, as almost all are in practice bounded 1792 * by more specific checks using labels. 1793 */ 1794 case PRIV_VFS_READ: 1795 case PRIV_VFS_WRITE: 1796 case PRIV_VFS_ADMIN: 1797 case PRIV_VFS_EXEC: 1798 case PRIV_VFS_LOOKUP: 1799 case PRIV_VFS_CHFLAGS_DEV: 1800 case PRIV_VFS_CHOWN: 1801 case PRIV_VFS_CHROOT: 1802 case PRIV_VFS_RETAINSUGID: 1803 case PRIV_VFS_EXCEEDQUOTA: 1804 case PRIV_VFS_FCHROOT: 1805 case PRIV_VFS_FHOPEN: 1806 case PRIV_VFS_FHSTATFS: 1807 case PRIV_VFS_GENERATION: 1808 case PRIV_VFS_GETFH: 1809 case PRIV_VFS_GETQUOTA: 1810 case PRIV_VFS_LINK: 1811 case PRIV_VFS_MOUNT: 1812 case PRIV_VFS_MOUNT_OWNER: 1813 case PRIV_VFS_MOUNT_PERM: 1814 case PRIV_VFS_MOUNT_SUIDDIR: 1815 case PRIV_VFS_MOUNT_NONUSER: 1816 case PRIV_VFS_SETGID: 1817 case PRIV_VFS_STICKYFILE: 1818 case PRIV_VFS_SYSFLAGS: 1819 case PRIV_VFS_UNMOUNT: 1820 1821 /* 1822 * Allow VM privileges; it would be nice if these were subject to 1823 * resource limits. 1824 */ 1825 case PRIV_VM_MADV_PROTECT: 1826 case PRIV_VM_MLOCK: 1827 case PRIV_VM_MUNLOCK: 1828 case PRIV_VM_SWAP_NOQUOTA: 1829 case PRIV_VM_SWAP_NORLIMIT: 1830 1831 /* 1832 * Allow some but not all network privileges. In general, dont allow 1833 * reconfiguring the network stack, just normal use. 1834 */ 1835 case PRIV_NETATALK_RESERVEDPORT: 1836 case PRIV_NETINET_RESERVEDPORT: 1837 case PRIV_NETINET_RAW: 1838 case PRIV_NETINET_REUSEPORT: 1839 case PRIV_NETIPX_RESERVEDPORT: 1840 case PRIV_NETIPX_RAW: 1841 break; 1842 1843 /* 1844 * All remaining system privileges are allow only if the process 1845 * holds privilege with respect to the LOMAC policy. 1846 */ 1847 default: 1848 subj = SLOT(cred->cr_label); 1849 error = lomac_subject_privileged(subj); 1850 if (error) 1851 return (error); 1852 } 1853 return (0); 1854 } 1855 1856 static int 1857 lomac_proc_check_debug(struct ucred *cred, struct proc *p) 1858 { 1859 struct mac_lomac *subj, *obj; 1860 1861 if (!lomac_enabled) 1862 return (0); 1863 1864 subj = SLOT(cred->cr_label); 1865 obj = SLOT(p->p_ucred->cr_label); 1866 1867 /* XXX: range checks */ 1868 if (!lomac_dominate_single(obj, subj)) 1869 return (ESRCH); 1870 if (!lomac_subject_dominate(subj, obj)) 1871 return (EACCES); 1872 1873 return (0); 1874 } 1875 1876 static int 1877 lomac_proc_check_sched(struct ucred *cred, struct proc *p) 1878 { 1879 struct mac_lomac *subj, *obj; 1880 1881 if (!lomac_enabled) 1882 return (0); 1883 1884 subj = SLOT(cred->cr_label); 1885 obj = SLOT(p->p_ucred->cr_label); 1886 1887 /* XXX: range checks */ 1888 if (!lomac_dominate_single(obj, subj)) 1889 return (ESRCH); 1890 if (!lomac_subject_dominate(subj, obj)) 1891 return (EACCES); 1892 1893 return (0); 1894 } 1895 1896 static int 1897 lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1898 { 1899 struct mac_lomac *subj, *obj; 1900 1901 if (!lomac_enabled) 1902 return (0); 1903 1904 subj = SLOT(cred->cr_label); 1905 obj = SLOT(p->p_ucred->cr_label); 1906 1907 /* XXX: range checks */ 1908 if (!lomac_dominate_single(obj, subj)) 1909 return (ESRCH); 1910 if (!lomac_subject_dominate(subj, obj)) 1911 return (EACCES); 1912 1913 return (0); 1914 } 1915 1916 static void 1917 lomac_proc_destroy_label(struct label *label) 1918 { 1919 1920 mtx_destroy(&PSLOT(label)->mtx); 1921 free(PSLOT(label), M_LOMAC); 1922 PSLOT_SET(label, NULL); 1923 } 1924 1925 static void 1926 lomac_proc_init_label(struct label *label) 1927 { 1928 1929 PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC, 1930 M_ZERO | M_WAITOK)); 1931 mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF); 1932 } 1933 1934 static int 1935 lomac_socket_check_deliver(struct socket *so, struct label *solabel, 1936 struct mbuf *m, struct label *mlabel) 1937 { 1938 struct mac_lomac *p, *s; 1939 int error; 1940 1941 if (!lomac_enabled) 1942 return (0); 1943 1944 p = SLOT(mlabel); 1945 s = SLOT(solabel); 1946 1947 SOCK_LOCK(so); 1948 error = lomac_equal_single(p, s) ? 0 : EACCES; 1949 SOCK_UNLOCK(so); 1950 return (error); 1951 } 1952 1953 static int 1954 lomac_socket_check_relabel(struct ucred *cred, struct socket *so, 1955 struct label *solabel, struct label *newlabel) 1956 { 1957 struct mac_lomac *subj, *obj, *new; 1958 int error; 1959 1960 SOCK_LOCK_ASSERT(so); 1961 1962 new = SLOT(newlabel); 1963 subj = SLOT(cred->cr_label); 1964 obj = SLOT(solabel); 1965 1966 /* 1967 * If there is a LOMAC label update for the socket, it may be an 1968 * update of single. 1969 */ 1970 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); 1971 if (error) 1972 return (error); 1973 1974 /* 1975 * To relabel a socket, the old socket single must be in the subject 1976 * range. 1977 */ 1978 if (!lomac_single_in_range(obj, subj)) 1979 return (EPERM); 1980 1981 /* 1982 * If the LOMAC label is to be changed, authorize as appropriate. 1983 */ 1984 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 1985 /* 1986 * To relabel a socket, the new socket single must be in the 1987 * subject range. 1988 */ 1989 if (!lomac_single_in_range(new, subj)) 1990 return (EPERM); 1991 1992 /* 1993 * To change the LOMAC label on the socket to contain EQUAL, 1994 * the subject must have appropriate privilege. 1995 */ 1996 if (lomac_contains_equal(new)) { 1997 error = lomac_subject_privileged(subj); 1998 if (error) 1999 return (error); 2000 } 2001 } 2002 2003 return (0); 2004 } 2005 2006 static int 2007 lomac_socket_check_visible(struct ucred *cred, struct socket *so, 2008 struct label *solabel) 2009 { 2010 struct mac_lomac *subj, *obj; 2011 2012 if (!lomac_enabled) 2013 return (0); 2014 2015 subj = SLOT(cred->cr_label); 2016 obj = SLOT(solabel); 2017 2018 SOCK_LOCK(so); 2019 if (!lomac_dominate_single(obj, subj)) { 2020 SOCK_UNLOCK(so); 2021 return (ENOENT); 2022 } 2023 SOCK_UNLOCK(so); 2024 2025 return (0); 2026 } 2027 2028 static void 2029 lomac_socket_create(struct ucred *cred, struct socket *so, 2030 struct label *solabel) 2031 { 2032 struct mac_lomac *source, *dest; 2033 2034 source = SLOT(cred->cr_label); 2035 dest = SLOT(solabel); 2036 2037 lomac_copy_single(source, dest); 2038 } 2039 2040 static void 2041 lomac_socket_create_mbuf(struct socket *so, struct label *solabel, 2042 struct mbuf *m, struct label *mlabel) 2043 { 2044 struct mac_lomac *source, *dest; 2045 2046 source = SLOT(solabel); 2047 dest = SLOT(mlabel); 2048 2049 SOCK_LOCK(so); 2050 lomac_copy_single(source, dest); 2051 SOCK_UNLOCK(so); 2052 } 2053 2054 static void 2055 lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel, 2056 struct socket *newso, struct label *newsolabel) 2057 { 2058 struct mac_lomac source, *dest; 2059 2060 SOCK_LOCK(oldso); 2061 source = *SLOT(oldsolabel); 2062 SOCK_UNLOCK(oldso); 2063 2064 dest = SLOT(newsolabel); 2065 2066 SOCK_LOCK(newso); 2067 lomac_copy_single(&source, dest); 2068 SOCK_UNLOCK(newso); 2069 } 2070 2071 static void 2072 lomac_socket_relabel(struct ucred *cred, struct socket *so, 2073 struct label *solabel, struct label *newlabel) 2074 { 2075 struct mac_lomac *source, *dest; 2076 2077 SOCK_LOCK_ASSERT(so); 2078 2079 source = SLOT(newlabel); 2080 dest = SLOT(solabel); 2081 2082 try_relabel(source, dest); 2083 } 2084 2085 static void 2086 lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 2087 struct socket *so, struct label *sopeerlabel) 2088 { 2089 struct mac_lomac *source, *dest; 2090 2091 source = SLOT(mlabel); 2092 dest = SLOT(sopeerlabel); 2093 2094 SOCK_LOCK(so); 2095 lomac_copy_single(source, dest); 2096 SOCK_UNLOCK(so); 2097 } 2098 2099 static void 2100 lomac_socketpeer_set_from_socket(struct socket *oldso, 2101 struct label *oldsolabel, struct socket *newso, 2102 struct label *newsopeerlabel) 2103 { 2104 struct mac_lomac source, *dest; 2105 2106 SOCK_LOCK(oldso); 2107 source = *SLOT(oldsolabel); 2108 SOCK_UNLOCK(oldso); 2109 2110 dest = SLOT(newsopeerlabel); 2111 2112 SOCK_LOCK(newso); 2113 lomac_copy_single(&source, dest); 2114 SOCK_UNLOCK(newso); 2115 } 2116 2117 static void 2118 lomac_syncache_create(struct label *label, struct inpcb *inp) 2119 { 2120 struct mac_lomac *source, *dest; 2121 2122 source = SLOT(inp->inp_label); 2123 dest = SLOT(label); 2124 lomac_copy(source, dest); 2125 } 2126 2127 static void 2128 lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2129 struct label *mlabel) 2130 { 2131 struct mac_lomac *source, *dest; 2132 2133 source = SLOT(sc_label); 2134 dest = SLOT(mlabel); 2135 lomac_copy(source, dest); 2136 } 2137 2138 static int 2139 lomac_system_check_acct(struct ucred *cred, struct vnode *vp, 2140 struct label *vplabel) 2141 { 2142 struct mac_lomac *subj, *obj; 2143 2144 if (!lomac_enabled) 2145 return (0); 2146 2147 subj = SLOT(cred->cr_label); 2148 obj = SLOT(vplabel); 2149 2150 if (lomac_subject_privileged(subj)) 2151 return (EPERM); 2152 2153 if (!lomac_high_single(obj)) 2154 return (EACCES); 2155 2156 return (0); 2157 } 2158 2159 static int 2160 lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2161 struct label *vplabel) 2162 { 2163 struct mac_lomac *subj, *obj; 2164 2165 if (!lomac_enabled) 2166 return (0); 2167 2168 subj = SLOT(cred->cr_label); 2169 obj = SLOT(vplabel); 2170 2171 if (lomac_subject_privileged(subj)) 2172 return (EPERM); 2173 2174 if (!lomac_high_single(obj)) 2175 return (EACCES); 2176 2177 return (0); 2178 } 2179 2180 static int 2181 lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2182 struct label *vplabel) 2183 { 2184 struct mac_lomac *subj; 2185 2186 if (!lomac_enabled) 2187 return (0); 2188 2189 subj = SLOT(cred->cr_label); 2190 2191 if (lomac_subject_privileged(subj)) 2192 return (EPERM); 2193 2194 return (0); 2195 } 2196 2197 static int 2198 lomac_system_check_swapon(struct ucred *cred, struct vnode *vp, 2199 struct label *vplabel) 2200 { 2201 struct mac_lomac *subj, *obj; 2202 2203 if (!lomac_enabled) 2204 return (0); 2205 2206 subj = SLOT(cred->cr_label); 2207 obj = SLOT(vplabel); 2208 2209 if (lomac_subject_privileged(subj)) 2210 return (EPERM); 2211 2212 if (!lomac_high_single(obj)) 2213 return (EACCES); 2214 2215 return (0); 2216 } 2217 2218 static int 2219 lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2220 void *arg1, int arg2, struct sysctl_req *req) 2221 { 2222 struct mac_lomac *subj; 2223 2224 if (!lomac_enabled) 2225 return (0); 2226 2227 subj = SLOT(cred->cr_label); 2228 2229 /* 2230 * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high, 2231 * but also require privilege to change them. 2232 */ 2233 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2234 #ifdef notdef 2235 if (!lomac_subject_dominate_high(subj)) 2236 return (EACCES); 2237 #endif 2238 2239 if (lomac_subject_privileged(subj)) 2240 return (EPERM); 2241 } 2242 2243 return (0); 2244 } 2245 2246 static void 2247 lomac_thread_userret(struct thread *td) 2248 { 2249 struct proc *p = td->td_proc; 2250 struct mac_lomac_proc *subj = PSLOT(p->p_label); 2251 struct ucred *newcred, *oldcred; 2252 int dodrop; 2253 2254 mtx_lock(&subj->mtx); 2255 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) { 2256 dodrop = 0; 2257 mtx_unlock(&subj->mtx); 2258 newcred = crget(); 2259 /* 2260 * Prevent a lock order reversal in mac_proc_vm_revoke; 2261 * ideally, the other user of subj->mtx wouldn't be holding 2262 * Giant. 2263 */ 2264 mtx_lock(&Giant); 2265 PROC_LOCK(p); 2266 mtx_lock(&subj->mtx); 2267 /* 2268 * Check if we lost the race while allocating the cred. 2269 */ 2270 if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) { 2271 crfree(newcred); 2272 goto out; 2273 } 2274 oldcred = p->p_ucred; 2275 crcopy(newcred, oldcred); 2276 crhold(newcred); 2277 lomac_copy(&subj->mac_lomac, SLOT(newcred->cr_label)); 2278 p->p_ucred = newcred; 2279 crfree(oldcred); 2280 dodrop = 1; 2281 out: 2282 mtx_unlock(&subj->mtx); 2283 PROC_UNLOCK(p); 2284 if (dodrop) 2285 mac_proc_vm_revoke(curthread); 2286 mtx_unlock(&Giant); 2287 } else { 2288 mtx_unlock(&subj->mtx); 2289 } 2290 } 2291 2292 static int 2293 lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2294 struct vnode *vp, struct label *vplabel) 2295 { 2296 struct mac_lomac ml_temp, *source, *dest; 2297 int buflen, error; 2298 2299 source = SLOT(mplabel); 2300 dest = SLOT(vplabel); 2301 2302 buflen = sizeof(ml_temp); 2303 bzero(&ml_temp, buflen); 2304 2305 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2306 MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread); 2307 if (error == ENOATTR || error == EOPNOTSUPP) { 2308 /* Fall back to the mntlabel. */ 2309 lomac_copy_single(source, dest); 2310 return (0); 2311 } else if (error) 2312 return (error); 2313 2314 if (buflen != sizeof(ml_temp)) { 2315 if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) { 2316 printf("lomac_vnode_associate_extattr: bad size %d\n", 2317 buflen); 2318 return (EPERM); 2319 } 2320 bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle)); 2321 buflen = sizeof(ml_temp); 2322 (void)vn_extattr_set(vp, IO_NODELOCKED, 2323 MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME, 2324 buflen, (char *)&ml_temp, curthread); 2325 } 2326 if (lomac_valid(&ml_temp) != 0) { 2327 printf("lomac_vnode_associate_extattr: invalid\n"); 2328 return (EPERM); 2329 } 2330 if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) != 2331 MAC_LOMAC_FLAG_SINGLE) { 2332 printf("lomac_vnode_associate_extattr: not single\n"); 2333 return (EPERM); 2334 } 2335 2336 lomac_copy_single(&ml_temp, dest); 2337 return (0); 2338 } 2339 2340 static void 2341 lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2342 struct vnode *vp, struct label *vplabel) 2343 { 2344 struct mac_lomac *source, *dest; 2345 2346 source = SLOT(mplabel); 2347 dest = SLOT(vplabel); 2348 2349 lomac_copy_single(source, dest); 2350 } 2351 2352 static int 2353 lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2354 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2355 { 2356 struct mac_lomac *subj, *obj; 2357 2358 if (!lomac_enabled) 2359 return (0); 2360 2361 subj = SLOT(cred->cr_label); 2362 obj = SLOT(dvplabel); 2363 2364 if (!lomac_subject_dominate(subj, obj)) 2365 return (EACCES); 2366 if (obj->ml_flags & MAC_LOMAC_FLAG_AUX && 2367 !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle)) 2368 return (EACCES); 2369 2370 return (0); 2371 } 2372 2373 static int 2374 lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2375 struct label *vplabel, acl_type_t type) 2376 { 2377 struct mac_lomac *subj, *obj; 2378 2379 if (!lomac_enabled) 2380 return (0); 2381 2382 subj = SLOT(cred->cr_label); 2383 obj = SLOT(vplabel); 2384 2385 if (!lomac_subject_dominate(subj, obj)) 2386 return (EACCES); 2387 2388 return (0); 2389 } 2390 2391 static int 2392 lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2393 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2394 struct componentname *cnp) 2395 { 2396 struct mac_lomac *subj, *obj; 2397 2398 if (!lomac_enabled) 2399 return (0); 2400 2401 subj = SLOT(cred->cr_label); 2402 obj = SLOT(dvplabel); 2403 2404 if (!lomac_subject_dominate(subj, obj)) 2405 return (EACCES); 2406 2407 obj = SLOT(vplabel); 2408 2409 if (!lomac_subject_dominate(subj, obj)) 2410 return (EACCES); 2411 2412 return (0); 2413 } 2414 2415 static int 2416 lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2417 struct label *vplabel, int prot, int flags) 2418 { 2419 struct mac_lomac *subj, *obj; 2420 2421 /* 2422 * Rely on the use of open()-time protections to handle 2423 * non-revocation cases. 2424 */ 2425 if (!lomac_enabled) 2426 return (0); 2427 2428 subj = SLOT(cred->cr_label); 2429 obj = SLOT(vplabel); 2430 2431 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2432 if (!lomac_subject_dominate(subj, obj)) 2433 return (EACCES); 2434 } 2435 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2436 if (!lomac_dominate_single(obj, subj)) 2437 return (maybe_demote(subj, obj, "mapping", "file", vp)); 2438 } 2439 2440 return (0); 2441 } 2442 2443 static void 2444 lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp, 2445 struct label *vplabel, /* XXX vm_prot_t */ int *prot) 2446 { 2447 struct mac_lomac *subj, *obj; 2448 2449 /* 2450 * Rely on the use of open()-time protections to handle 2451 * non-revocation cases. 2452 */ 2453 if (!lomac_enabled || !revocation_enabled) 2454 return; 2455 2456 subj = SLOT(cred->cr_label); 2457 obj = SLOT(vplabel); 2458 2459 if (!lomac_subject_dominate(subj, obj)) 2460 *prot &= ~VM_PROT_WRITE; 2461 } 2462 2463 static int 2464 lomac_vnode_check_open(struct ucred *cred, struct vnode *vp, 2465 struct label *vplabel, accmode_t accmode) 2466 { 2467 struct mac_lomac *subj, *obj; 2468 2469 if (!lomac_enabled) 2470 return (0); 2471 2472 subj = SLOT(cred->cr_label); 2473 obj = SLOT(vplabel); 2474 2475 /* XXX privilege override for admin? */ 2476 if (accmode & VMODIFY_PERMS) { 2477 if (!lomac_subject_dominate(subj, obj)) 2478 return (EACCES); 2479 } 2480 2481 return (0); 2482 } 2483 2484 static int 2485 lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2486 struct vnode *vp, struct label *vplabel) 2487 { 2488 struct mac_lomac *subj, *obj; 2489 2490 if (!lomac_enabled || !revocation_enabled) 2491 return (0); 2492 2493 subj = SLOT(active_cred->cr_label); 2494 obj = SLOT(vplabel); 2495 2496 if (!lomac_dominate_single(obj, subj)) 2497 return (maybe_demote(subj, obj, "reading", "file", vp)); 2498 2499 return (0); 2500 } 2501 2502 static int 2503 lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2504 struct label *vplabel, struct label *newlabel) 2505 { 2506 struct mac_lomac *old, *new, *subj; 2507 int error; 2508 2509 old = SLOT(vplabel); 2510 new = SLOT(newlabel); 2511 subj = SLOT(cred->cr_label); 2512 2513 /* 2514 * If there is a LOMAC label update for the vnode, it must be a 2515 * single label, with an optional explicit auxiliary single. 2516 */ 2517 error = lomac_atmostflags(new, 2518 MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX); 2519 if (error) 2520 return (error); 2521 2522 /* 2523 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must 2524 * authorize the relabel. 2525 */ 2526 if (!lomac_single_in_range(old, subj)) 2527 return (EPERM); 2528 2529 /* 2530 * If the LOMAC label is to be changed, authorize as appropriate. 2531 */ 2532 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 2533 /* 2534 * To change the LOMAC label on a vnode, the new vnode label 2535 * must be in the subject range. 2536 */ 2537 if (!lomac_single_in_range(new, subj)) 2538 return (EPERM); 2539 2540 /* 2541 * To change the LOMAC label on the vnode to be EQUAL, the 2542 * subject must have appropriate privilege. 2543 */ 2544 if (lomac_contains_equal(new)) { 2545 error = lomac_subject_privileged(subj); 2546 if (error) 2547 return (error); 2548 } 2549 } 2550 if (new->ml_flags & MAC_LOMAC_FLAG_AUX) { 2551 /* 2552 * Fill in the missing parts from the previous label. 2553 */ 2554 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 2555 lomac_copy_single(subj, new); 2556 2557 /* 2558 * To change the auxiliary LOMAC label on a vnode, the new 2559 * vnode label must be in the subject range. 2560 */ 2561 if (!lomac_auxsingle_in_range(new, subj)) 2562 return (EPERM); 2563 2564 /* 2565 * To change the auxiliary LOMAC label on the vnode to be 2566 * EQUAL, the subject must have appropriate privilege. 2567 */ 2568 if (lomac_contains_equal(new)) { 2569 error = lomac_subject_privileged(subj); 2570 if (error) 2571 return (error); 2572 } 2573 } 2574 2575 return (0); 2576 } 2577 2578 static int 2579 lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 2580 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2581 struct componentname *cnp) 2582 { 2583 struct mac_lomac *subj, *obj; 2584 2585 if (!lomac_enabled) 2586 return (0); 2587 2588 subj = SLOT(cred->cr_label); 2589 obj = SLOT(dvplabel); 2590 2591 if (!lomac_subject_dominate(subj, obj)) 2592 return (EACCES); 2593 2594 obj = SLOT(vplabel); 2595 2596 if (!lomac_subject_dominate(subj, obj)) 2597 return (EACCES); 2598 2599 return (0); 2600 } 2601 2602 static int 2603 lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 2604 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2605 int samedir, struct componentname *cnp) 2606 { 2607 struct mac_lomac *subj, *obj; 2608 2609 if (!lomac_enabled) 2610 return (0); 2611 2612 subj = SLOT(cred->cr_label); 2613 obj = SLOT(dvplabel); 2614 2615 if (!lomac_subject_dominate(subj, obj)) 2616 return (EACCES); 2617 2618 if (vp != NULL) { 2619 obj = SLOT(vplabel); 2620 2621 if (!lomac_subject_dominate(subj, obj)) 2622 return (EACCES); 2623 } 2624 2625 return (0); 2626 } 2627 2628 static int 2629 lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 2630 struct label *vplabel) 2631 { 2632 struct mac_lomac *subj, *obj; 2633 2634 if (!lomac_enabled) 2635 return (0); 2636 2637 subj = SLOT(cred->cr_label); 2638 obj = SLOT(vplabel); 2639 2640 if (!lomac_subject_dominate(subj, obj)) 2641 return (EACCES); 2642 2643 return (0); 2644 } 2645 2646 static int 2647 lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 2648 struct label *vplabel, acl_type_t type, struct acl *acl) 2649 { 2650 struct mac_lomac *subj, *obj; 2651 2652 if (!lomac_enabled) 2653 return (0); 2654 2655 subj = SLOT(cred->cr_label); 2656 obj = SLOT(vplabel); 2657 2658 if (!lomac_subject_dominate(subj, obj)) 2659 return (EACCES); 2660 2661 return (0); 2662 } 2663 2664 static int 2665 lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 2666 struct label *vplabel, int attrnamespace, const char *name) 2667 { 2668 struct mac_lomac *subj, *obj; 2669 2670 if (!lomac_enabled) 2671 return (0); 2672 2673 subj = SLOT(cred->cr_label); 2674 obj = SLOT(vplabel); 2675 2676 if (!lomac_subject_dominate(subj, obj)) 2677 return (EACCES); 2678 2679 /* XXX: protect the MAC EA in a special way? */ 2680 2681 return (0); 2682 } 2683 2684 static int 2685 lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 2686 struct label *vplabel, u_long flags) 2687 { 2688 struct mac_lomac *subj, *obj; 2689 2690 if (!lomac_enabled) 2691 return (0); 2692 2693 subj = SLOT(cred->cr_label); 2694 obj = SLOT(vplabel); 2695 2696 if (!lomac_subject_dominate(subj, obj)) 2697 return (EACCES); 2698 2699 return (0); 2700 } 2701 2702 static int 2703 lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 2704 struct label *vplabel, mode_t mode) 2705 { 2706 struct mac_lomac *subj, *obj; 2707 2708 if (!lomac_enabled) 2709 return (0); 2710 2711 subj = SLOT(cred->cr_label); 2712 obj = SLOT(vplabel); 2713 2714 if (!lomac_subject_dominate(subj, obj)) 2715 return (EACCES); 2716 2717 return (0); 2718 } 2719 2720 static int 2721 lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 2722 struct label *vplabel, uid_t uid, gid_t gid) 2723 { 2724 struct mac_lomac *subj, *obj; 2725 2726 if (!lomac_enabled) 2727 return (0); 2728 2729 subj = SLOT(cred->cr_label); 2730 obj = SLOT(vplabel); 2731 2732 if (!lomac_subject_dominate(subj, obj)) 2733 return (EACCES); 2734 2735 return (0); 2736 } 2737 2738 static int 2739 lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 2740 struct label *vplabel, struct timespec atime, struct timespec mtime) 2741 { 2742 struct mac_lomac *subj, *obj; 2743 2744 if (!lomac_enabled) 2745 return (0); 2746 2747 subj = SLOT(cred->cr_label); 2748 obj = SLOT(vplabel); 2749 2750 if (!lomac_subject_dominate(subj, obj)) 2751 return (EACCES); 2752 2753 return (0); 2754 } 2755 2756 static int 2757 lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 2758 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2759 struct componentname *cnp) 2760 { 2761 struct mac_lomac *subj, *obj; 2762 2763 if (!lomac_enabled) 2764 return (0); 2765 2766 subj = SLOT(cred->cr_label); 2767 obj = SLOT(dvplabel); 2768 2769 if (!lomac_subject_dominate(subj, obj)) 2770 return (EACCES); 2771 2772 obj = SLOT(vplabel); 2773 2774 if (!lomac_subject_dominate(subj, obj)) 2775 return (EACCES); 2776 2777 return (0); 2778 } 2779 2780 static int 2781 lomac_vnode_check_write(struct ucred *active_cred, 2782 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 2783 { 2784 struct mac_lomac *subj, *obj; 2785 2786 if (!lomac_enabled || !revocation_enabled) 2787 return (0); 2788 2789 subj = SLOT(active_cred->cr_label); 2790 obj = SLOT(vplabel); 2791 2792 if (!lomac_subject_dominate(subj, obj)) 2793 return (EACCES); 2794 2795 return (0); 2796 } 2797 2798 static int 2799 lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp, 2800 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 2801 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 2802 { 2803 struct mac_lomac *source, *dest, *dir, temp; 2804 size_t buflen; 2805 int error; 2806 2807 buflen = sizeof(temp); 2808 bzero(&temp, buflen); 2809 2810 source = SLOT(cred->cr_label); 2811 dest = SLOT(vplabel); 2812 dir = SLOT(dvplabel); 2813 if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) { 2814 lomac_copy_auxsingle(dir, &temp); 2815 lomac_set_single(&temp, dir->ml_auxsingle.mle_type, 2816 dir->ml_auxsingle.mle_grade); 2817 } else { 2818 lomac_copy_single(source, &temp); 2819 } 2820 2821 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2822 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); 2823 if (error == 0) 2824 lomac_copy(&temp, dest); 2825 return (error); 2826 } 2827 2828 static void 2829 lomac_vnode_execve_transition(struct ucred *old, struct ucred *new, 2830 struct vnode *vp, struct label *vplabel, struct label *interpvplabel, 2831 struct image_params *imgp, struct label *execlabel) 2832 { 2833 struct mac_lomac *source, *dest, *obj, *robj; 2834 2835 source = SLOT(old->cr_label); 2836 dest = SLOT(new->cr_label); 2837 obj = SLOT(vplabel); 2838 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; 2839 2840 lomac_copy(source, dest); 2841 /* 2842 * If there's an auxiliary label on the real object, respect it and 2843 * assume that this level should be assumed immediately if a higher 2844 * level is currently in place. 2845 */ 2846 if (robj->ml_flags & MAC_LOMAC_FLAG_AUX && 2847 !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single) 2848 && lomac_auxsingle_in_range(robj, dest)) 2849 lomac_set_single(dest, robj->ml_auxsingle.mle_type, 2850 robj->ml_auxsingle.mle_grade); 2851 /* 2852 * Restructuring to use the execve transitioning mechanism instead of 2853 * the normal demotion mechanism here would be difficult, so just 2854 * copy the label over and perform standard demotion. This is also 2855 * non-optimal because it will result in the intermediate label "new" 2856 * being created and immediately recycled. 2857 */ 2858 if (lomac_enabled && revocation_enabled && 2859 !lomac_dominate_single(obj, source)) 2860 (void)maybe_demote(source, obj, "executing", "file", vp); 2861 } 2862 2863 static int 2864 lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp, 2865 struct label *vplabel, struct label *interpvplabel, 2866 struct image_params *imgp, struct label *execlabel) 2867 { 2868 struct mac_lomac *subj, *obj, *robj; 2869 2870 if (!lomac_enabled || !revocation_enabled) 2871 return (0); 2872 2873 subj = SLOT(old->cr_label); 2874 obj = SLOT(vplabel); 2875 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; 2876 2877 return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX && 2878 !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single) 2879 && lomac_auxsingle_in_range(robj, subj)) || 2880 !lomac_dominate_single(obj, subj)); 2881 } 2882 2883 static void 2884 lomac_vnode_relabel(struct ucred *cred, struct vnode *vp, 2885 struct label *vplabel, struct label *newlabel) 2886 { 2887 struct mac_lomac *source, *dest; 2888 2889 source = SLOT(newlabel); 2890 dest = SLOT(vplabel); 2891 2892 try_relabel(source, dest); 2893 } 2894 2895 static int 2896 lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 2897 struct label *vplabel, struct label *intlabel) 2898 { 2899 struct mac_lomac *source, temp; 2900 size_t buflen; 2901 int error; 2902 2903 buflen = sizeof(temp); 2904 bzero(&temp, buflen); 2905 2906 source = SLOT(intlabel); 2907 if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 2908 return (0); 2909 2910 lomac_copy_single(source, &temp); 2911 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2912 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); 2913 return (error); 2914 } 2915 2916 static struct mac_policy_ops lomac_ops = 2917 { 2918 .mpo_init = lomac_init, 2919 2920 .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive, 2921 .mpo_bpfdesc_create = lomac_bpfdesc_create, 2922 .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf, 2923 .mpo_bpfdesc_destroy_label = lomac_destroy_label, 2924 .mpo_bpfdesc_init_label = lomac_init_label, 2925 2926 .mpo_cred_check_relabel = lomac_cred_check_relabel, 2927 .mpo_cred_check_visible = lomac_cred_check_visible, 2928 .mpo_cred_copy_label = lomac_copy_label, 2929 .mpo_cred_create_swapper = lomac_cred_create_swapper, 2930 .mpo_cred_create_init = lomac_cred_create_init, 2931 .mpo_cred_destroy_label = lomac_destroy_label, 2932 .mpo_cred_externalize_label = lomac_externalize_label, 2933 .mpo_cred_init_label = lomac_init_label, 2934 .mpo_cred_internalize_label = lomac_internalize_label, 2935 .mpo_cred_relabel = lomac_cred_relabel, 2936 2937 .mpo_devfs_create_device = lomac_devfs_create_device, 2938 .mpo_devfs_create_directory = lomac_devfs_create_directory, 2939 .mpo_devfs_create_symlink = lomac_devfs_create_symlink, 2940 .mpo_devfs_destroy_label = lomac_destroy_label, 2941 .mpo_devfs_init_label = lomac_init_label, 2942 .mpo_devfs_update = lomac_devfs_update, 2943 .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate, 2944 2945 .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel, 2946 .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit, 2947 .mpo_ifnet_copy_label = lomac_copy_label, 2948 .mpo_ifnet_create = lomac_ifnet_create, 2949 .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf, 2950 .mpo_ifnet_destroy_label = lomac_destroy_label, 2951 .mpo_ifnet_externalize_label = lomac_externalize_label, 2952 .mpo_ifnet_init_label = lomac_init_label, 2953 .mpo_ifnet_internalize_label = lomac_internalize_label, 2954 .mpo_ifnet_relabel = lomac_ifnet_relabel, 2955 2956 .mpo_syncache_create = lomac_syncache_create, 2957 .mpo_syncache_destroy_label = lomac_destroy_label, 2958 .mpo_syncache_init_label = lomac_init_label_waitcheck, 2959 2960 .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver, 2961 .mpo_inpcb_check_visible = lomac_inpcb_check_visible, 2962 .mpo_inpcb_create = lomac_inpcb_create, 2963 .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf, 2964 .mpo_inpcb_destroy_label = lomac_destroy_label, 2965 .mpo_inpcb_init_label = lomac_init_label_waitcheck, 2966 .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel, 2967 2968 .mpo_ip6q_create = lomac_ip6q_create, 2969 .mpo_ip6q_destroy_label = lomac_destroy_label, 2970 .mpo_ip6q_init_label = lomac_init_label_waitcheck, 2971 .mpo_ip6q_match = lomac_ip6q_match, 2972 .mpo_ip6q_reassemble = lomac_ip6q_reassemble, 2973 .mpo_ip6q_update = lomac_ip6q_update, 2974 2975 .mpo_ipq_create = lomac_ipq_create, 2976 .mpo_ipq_destroy_label = lomac_destroy_label, 2977 .mpo_ipq_init_label = lomac_init_label_waitcheck, 2978 .mpo_ipq_match = lomac_ipq_match, 2979 .mpo_ipq_reassemble = lomac_ipq_reassemble, 2980 .mpo_ipq_update = lomac_ipq_update, 2981 2982 .mpo_kld_check_load = lomac_kld_check_load, 2983 2984 .mpo_mbuf_copy_label = lomac_copy_label, 2985 .mpo_mbuf_destroy_label = lomac_destroy_label, 2986 .mpo_mbuf_init_label = lomac_init_label_waitcheck, 2987 2988 .mpo_mount_create = lomac_mount_create, 2989 .mpo_mount_destroy_label = lomac_destroy_label, 2990 .mpo_mount_init_label = lomac_init_label, 2991 2992 .mpo_netatalk_aarp_send = lomac_netatalk_aarp_send, 2993 2994 .mpo_netinet_arp_send = lomac_netinet_arp_send, 2995 .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply, 2996 .mpo_netinet_firewall_send = lomac_netinet_firewall_send, 2997 .mpo_netinet_fragment = lomac_netinet_fragment, 2998 .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply, 2999 .mpo_netinet_igmp_send = lomac_netinet_igmp_send, 3000 3001 .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send, 3002 3003 .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl, 3004 .mpo_pipe_check_read = lomac_pipe_check_read, 3005 .mpo_pipe_check_relabel = lomac_pipe_check_relabel, 3006 .mpo_pipe_check_write = lomac_pipe_check_write, 3007 .mpo_pipe_copy_label = lomac_copy_label, 3008 .mpo_pipe_create = lomac_pipe_create, 3009 .mpo_pipe_destroy_label = lomac_destroy_label, 3010 .mpo_pipe_externalize_label = lomac_externalize_label, 3011 .mpo_pipe_init_label = lomac_init_label, 3012 .mpo_pipe_internalize_label = lomac_internalize_label, 3013 .mpo_pipe_relabel = lomac_pipe_relabel, 3014 3015 .mpo_priv_check = lomac_priv_check, 3016 3017 .mpo_proc_check_debug = lomac_proc_check_debug, 3018 .mpo_proc_check_sched = lomac_proc_check_sched, 3019 .mpo_proc_check_signal = lomac_proc_check_signal, 3020 .mpo_proc_destroy_label = lomac_proc_destroy_label, 3021 .mpo_proc_init_label = lomac_proc_init_label, 3022 3023 .mpo_socket_check_deliver = lomac_socket_check_deliver, 3024 .mpo_socket_check_relabel = lomac_socket_check_relabel, 3025 .mpo_socket_check_visible = lomac_socket_check_visible, 3026 .mpo_socket_copy_label = lomac_copy_label, 3027 .mpo_socket_create = lomac_socket_create, 3028 .mpo_socket_create_mbuf = lomac_socket_create_mbuf, 3029 .mpo_socket_destroy_label = lomac_destroy_label, 3030 .mpo_socket_externalize_label = lomac_externalize_label, 3031 .mpo_socket_init_label = lomac_init_label_waitcheck, 3032 .mpo_socket_internalize_label = lomac_internalize_label, 3033 .mpo_socket_newconn = lomac_socket_newconn, 3034 .mpo_socket_relabel = lomac_socket_relabel, 3035 3036 .mpo_socketpeer_destroy_label = lomac_destroy_label, 3037 .mpo_socketpeer_externalize_label = lomac_externalize_label, 3038 .mpo_socketpeer_init_label = lomac_init_label_waitcheck, 3039 .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf, 3040 .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket, 3041 3042 .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf, 3043 3044 .mpo_system_check_acct = lomac_system_check_acct, 3045 .mpo_system_check_auditctl = lomac_system_check_auditctl, 3046 .mpo_system_check_swapoff = lomac_system_check_swapoff, 3047 .mpo_system_check_swapon = lomac_system_check_swapon, 3048 .mpo_system_check_sysctl = lomac_system_check_sysctl, 3049 3050 .mpo_thread_userret = lomac_thread_userret, 3051 3052 .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr, 3053 .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel, 3054 .mpo_vnode_check_access = lomac_vnode_check_open, 3055 .mpo_vnode_check_create = lomac_vnode_check_create, 3056 .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl, 3057 .mpo_vnode_check_link = lomac_vnode_check_link, 3058 .mpo_vnode_check_mmap = lomac_vnode_check_mmap, 3059 .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade, 3060 .mpo_vnode_check_open = lomac_vnode_check_open, 3061 .mpo_vnode_check_read = lomac_vnode_check_read, 3062 .mpo_vnode_check_relabel = lomac_vnode_check_relabel, 3063 .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from, 3064 .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to, 3065 .mpo_vnode_check_revoke = lomac_vnode_check_revoke, 3066 .mpo_vnode_check_setacl = lomac_vnode_check_setacl, 3067 .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr, 3068 .mpo_vnode_check_setflags = lomac_vnode_check_setflags, 3069 .mpo_vnode_check_setmode = lomac_vnode_check_setmode, 3070 .mpo_vnode_check_setowner = lomac_vnode_check_setowner, 3071 .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes, 3072 .mpo_vnode_check_unlink = lomac_vnode_check_unlink, 3073 .mpo_vnode_check_write = lomac_vnode_check_write, 3074 .mpo_vnode_copy_label = lomac_copy_label, 3075 .mpo_vnode_create_extattr = lomac_vnode_create_extattr, 3076 .mpo_vnode_destroy_label = lomac_destroy_label, 3077 .mpo_vnode_execve_transition = lomac_vnode_execve_transition, 3078 .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition, 3079 .mpo_vnode_externalize_label = lomac_externalize_label, 3080 .mpo_vnode_init_label = lomac_init_label, 3081 .mpo_vnode_internalize_label = lomac_internalize_label, 3082 .mpo_vnode_relabel = lomac_vnode_relabel, 3083 .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr, 3084 }; 3085 3086 MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC", 3087 MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot); 3088