1 /*- 2 * Copyright (c) 1999-2002, 2007-2008 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 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 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 = index(string, '('); 766 if (range == single) 767 single = NULL; 768 auxsingle = index(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 = index(rangelow, '-'); 780 if (rangehigh == NULL) 781 return (EINVAL); 782 rangehigh++; 783 if (*rangelow == '\0' || *rangehigh == '\0') 784 return (EINVAL); 785 rangeend = index(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 = index(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 int lomac_type; 1036 1037 ml = SLOT(delabel); 1038 if (strcmp(dev->si_name, "null") == 0 || 1039 strcmp(dev->si_name, "zero") == 0 || 1040 strcmp(dev->si_name, "random") == 0 || 1041 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0 || 1042 strncmp(dev->si_name, "ttyv", strlen("ttyv")) == 0) 1043 lomac_type = MAC_LOMAC_TYPE_EQUAL; 1044 else if (ptys_equal && 1045 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 || 1046 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 1047 lomac_type = MAC_LOMAC_TYPE_EQUAL; 1048 else 1049 lomac_type = MAC_LOMAC_TYPE_HIGH; 1050 lomac_set_single(ml, lomac_type, 0); 1051 } 1052 1053 static void 1054 lomac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 1055 struct devfs_dirent *de, struct label *delabel) 1056 { 1057 struct mac_lomac *ml; 1058 1059 ml = SLOT(delabel); 1060 lomac_set_single(ml, MAC_LOMAC_TYPE_HIGH, 0); 1061 } 1062 1063 static void 1064 lomac_devfs_create_symlink(struct ucred *cred, struct mount *mp, 1065 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 1066 struct label *delabel) 1067 { 1068 struct mac_lomac *source, *dest; 1069 1070 source = SLOT(cred->cr_label); 1071 dest = SLOT(delabel); 1072 1073 lomac_copy_single(source, dest); 1074 } 1075 1076 static void 1077 lomac_devfs_update(struct mount *mp, struct devfs_dirent *de, 1078 struct label *delabel, struct vnode *vp, struct label *vplabel) 1079 { 1080 struct mac_lomac *source, *dest; 1081 1082 source = SLOT(vplabel); 1083 dest = SLOT(delabel); 1084 1085 lomac_copy(source, dest); 1086 } 1087 1088 static void 1089 lomac_devfs_vnode_associate(struct mount *mp, struct label *mplabel, 1090 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 1091 struct label *vplabel) 1092 { 1093 struct mac_lomac *source, *dest; 1094 1095 source = SLOT(delabel); 1096 dest = SLOT(vplabel); 1097 1098 lomac_copy_single(source, dest); 1099 } 1100 1101 static int 1102 lomac_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1103 struct label *ifplabel, struct label *newlabel) 1104 { 1105 struct mac_lomac *subj, *new; 1106 int error; 1107 1108 subj = SLOT(cred->cr_label); 1109 new = SLOT(newlabel); 1110 1111 /* 1112 * If there is a LOMAC label update for the interface, it may be an 1113 * update of the single, range, or both. 1114 */ 1115 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH); 1116 if (error) 1117 return (error); 1118 1119 /* 1120 * Relabling network interfaces requires LOMAC privilege. 1121 */ 1122 error = lomac_subject_privileged(subj); 1123 if (error) 1124 return (error); 1125 1126 /* 1127 * If the LOMAC label is to be changed, authorize as appropriate. 1128 */ 1129 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) { 1130 /* 1131 * Fill in the missing parts from the previous label. 1132 */ 1133 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 1134 lomac_copy_single(subj, new); 1135 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0) 1136 lomac_copy_range(subj, new); 1137 1138 /* 1139 * Rely on the traditional superuser status for the LOMAC 1140 * interface relabel requirements. XXXMAC: This will go 1141 * away. 1142 * 1143 * XXXRW: This is also redundant to a higher layer check. 1144 */ 1145 error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 0); 1146 if (error) 1147 return (EPERM); 1148 1149 /* 1150 * XXXMAC: Additional consistency tests regarding the single 1151 * and the range of the new label might be performed here. 1152 */ 1153 } 1154 1155 return (0); 1156 } 1157 1158 static int 1159 lomac_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1160 struct mbuf *m, struct label *mlabel) 1161 { 1162 struct mac_lomac *p, *i; 1163 1164 if (!lomac_enabled) 1165 return (0); 1166 1167 p = SLOT(mlabel); 1168 i = SLOT(ifplabel); 1169 1170 return (lomac_single_in_range(p, i) ? 0 : EACCES); 1171 } 1172 1173 static void 1174 lomac_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1175 { 1176 char tifname[IFNAMSIZ], *p, *q; 1177 char tiflist[sizeof(trusted_interfaces)]; 1178 struct mac_lomac *dest; 1179 int len, grade; 1180 1181 dest = SLOT(ifplabel); 1182 1183 if (ifp->if_type == IFT_LOOP) { 1184 grade = MAC_LOMAC_TYPE_EQUAL; 1185 goto set; 1186 } 1187 1188 if (trust_all_interfaces) { 1189 grade = MAC_LOMAC_TYPE_HIGH; 1190 goto set; 1191 } 1192 1193 grade = MAC_LOMAC_TYPE_LOW; 1194 1195 if (trusted_interfaces[0] == '\0' || 1196 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1197 goto set; 1198 1199 bzero(tiflist, sizeof(tiflist)); 1200 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1201 if(*p != ' ' && *p != '\t') 1202 *q = *p; 1203 1204 for (p = q = tiflist;; p++) { 1205 if (*p == ',' || *p == '\0') { 1206 len = p - q; 1207 if (len < IFNAMSIZ) { 1208 bzero(tifname, sizeof(tifname)); 1209 bcopy(q, tifname, len); 1210 if (strcmp(tifname, ifp->if_xname) == 0) { 1211 grade = MAC_LOMAC_TYPE_HIGH; 1212 break; 1213 } 1214 } 1215 else { 1216 *p = '\0'; 1217 printf("MAC/LOMAC warning: interface name " 1218 "\"%s\" is too long (must be < %d)\n", 1219 q, IFNAMSIZ); 1220 } 1221 if (*p == '\0') 1222 break; 1223 q = p + 1; 1224 } 1225 } 1226 set: 1227 lomac_set_single(dest, grade, 0); 1228 lomac_set_range(dest, grade, 0, grade, 0); 1229 } 1230 1231 static void 1232 lomac_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1233 struct mbuf *m, struct label *mlabel) 1234 { 1235 struct mac_lomac *source, *dest; 1236 1237 source = SLOT(ifplabel); 1238 dest = SLOT(mlabel); 1239 1240 lomac_copy_single(source, dest); 1241 } 1242 1243 static void 1244 lomac_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1245 struct label *ifplabel, struct label *newlabel) 1246 { 1247 struct mac_lomac *source, *dest; 1248 1249 source = SLOT(newlabel); 1250 dest = SLOT(ifplabel); 1251 1252 try_relabel(source, dest); 1253 } 1254 1255 static int 1256 lomac_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1257 struct mbuf *m, struct label *mlabel) 1258 { 1259 struct mac_lomac *p, *i; 1260 1261 if (!lomac_enabled) 1262 return (0); 1263 1264 p = SLOT(mlabel); 1265 i = SLOT(inplabel); 1266 1267 return (lomac_equal_single(p, i) ? 0 : EACCES); 1268 } 1269 1270 static int 1271 lomac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, 1272 struct label *inplabel) 1273 { 1274 struct mac_lomac *subj, *obj; 1275 1276 if (!lomac_enabled) 1277 return (0); 1278 1279 subj = SLOT(cred->cr_label); 1280 obj = SLOT(inplabel); 1281 1282 if (!lomac_dominate_single(obj, subj)) 1283 return (ENOENT); 1284 1285 return (0); 1286 } 1287 1288 static void 1289 lomac_inpcb_create(struct socket *so, struct label *solabel, 1290 struct inpcb *inp, struct label *inplabel) 1291 { 1292 struct mac_lomac *source, *dest; 1293 1294 source = SLOT(solabel); 1295 dest = SLOT(inplabel); 1296 1297 lomac_copy_single(source, dest); 1298 } 1299 1300 static void 1301 lomac_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1302 struct mbuf *m, struct label *mlabel) 1303 { 1304 struct mac_lomac *source, *dest; 1305 1306 source = SLOT(inplabel); 1307 dest = SLOT(mlabel); 1308 1309 lomac_copy_single(source, dest); 1310 } 1311 1312 static void 1313 lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1314 struct inpcb *inp, struct label *inplabel) 1315 { 1316 struct mac_lomac *source, *dest; 1317 1318 source = SLOT(solabel); 1319 dest = SLOT(inplabel); 1320 1321 lomac_copy_single(source, dest); 1322 } 1323 1324 static void 1325 lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1326 struct label *q6label) 1327 { 1328 struct mac_lomac *source, *dest; 1329 1330 source = SLOT(mlabel); 1331 dest = SLOT(q6label); 1332 1333 lomac_copy_single(source, dest); 1334 } 1335 1336 static int 1337 lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1338 struct label *q6label) 1339 { 1340 struct mac_lomac *a, *b; 1341 1342 a = SLOT(q6label); 1343 b = SLOT(mlabel); 1344 1345 return (lomac_equal_single(a, b)); 1346 } 1347 1348 static void 1349 lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, 1350 struct label *mlabel) 1351 { 1352 struct mac_lomac *source, *dest; 1353 1354 source = SLOT(q6label); 1355 dest = SLOT(mlabel); 1356 1357 /* Just use the head, since we require them all to match. */ 1358 lomac_copy_single(source, dest); 1359 } 1360 1361 static void 1362 lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1363 struct label *q6label) 1364 { 1365 1366 /* NOOP: we only accept matching labels, so no need to update */ 1367 } 1368 1369 static void 1370 lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, 1371 struct label *qlabel) 1372 { 1373 struct mac_lomac *source, *dest; 1374 1375 source = SLOT(mlabel); 1376 dest = SLOT(qlabel); 1377 1378 lomac_copy_single(source, dest); 1379 } 1380 1381 static int 1382 lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, 1383 struct label *qlabel) 1384 { 1385 struct mac_lomac *a, *b; 1386 1387 a = SLOT(qlabel); 1388 b = SLOT(mlabel); 1389 1390 return (lomac_equal_single(a, b)); 1391 } 1392 1393 static void 1394 lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, 1395 struct label *mlabel) 1396 { 1397 struct mac_lomac *source, *dest; 1398 1399 source = SLOT(qlabel); 1400 dest = SLOT(mlabel); 1401 1402 /* Just use the head, since we require them all to match. */ 1403 lomac_copy_single(source, dest); 1404 } 1405 1406 static void 1407 lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, 1408 struct label *qlabel) 1409 { 1410 1411 /* NOOP: we only accept matching labels, so no need to update */ 1412 } 1413 1414 static int 1415 lomac_kld_check_load(struct ucred *cred, struct vnode *vp, 1416 struct label *vplabel) 1417 { 1418 struct mac_lomac *subj, *obj; 1419 1420 if (!lomac_enabled) 1421 return (0); 1422 1423 subj = SLOT(cred->cr_label); 1424 obj = SLOT(vplabel); 1425 1426 if (lomac_subject_privileged(subj)) 1427 return (EPERM); 1428 1429 if (!lomac_high_single(obj)) 1430 return (EACCES); 1431 1432 return (0); 1433 } 1434 1435 static void 1436 lomac_mount_create(struct ucred *cred, struct mount *mp, 1437 struct label *mplabel) 1438 { 1439 struct mac_lomac *source, *dest; 1440 1441 source = SLOT(cred->cr_label); 1442 dest = SLOT(mplabel); 1443 lomac_copy_single(source, dest); 1444 } 1445 1446 static void 1447 lomac_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1448 struct mbuf *m, struct label *mlabel) 1449 { 1450 struct mac_lomac *dest; 1451 1452 dest = SLOT(mlabel); 1453 1454 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1455 } 1456 1457 static void 1458 lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1459 struct mbuf *m, struct label *mlabel) 1460 { 1461 struct mac_lomac *dest; 1462 1463 dest = SLOT(mlabel); 1464 1465 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1466 } 1467 1468 static void 1469 lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1470 struct mbuf *msend, struct label *msendlabel) 1471 { 1472 struct mac_lomac *source, *dest; 1473 1474 source = SLOT(mrecvlabel); 1475 dest = SLOT(msendlabel); 1476 1477 lomac_copy_single(source, dest); 1478 } 1479 1480 static void 1481 lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1482 { 1483 struct mac_lomac *dest; 1484 1485 dest = SLOT(mlabel); 1486 1487 /* XXX: where is the label for the firewall really comming from? */ 1488 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1489 } 1490 1491 static void 1492 lomac_netinet_fragment(struct mbuf *m, struct label *mlabel, 1493 struct mbuf *frag, struct label *fraglabel) 1494 { 1495 struct mac_lomac *source, *dest; 1496 1497 source = SLOT(mlabel); 1498 dest = SLOT(fraglabel); 1499 1500 lomac_copy_single(source, dest); 1501 } 1502 1503 static void 1504 lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1505 struct mbuf *msend, struct label *msendlabel) 1506 { 1507 struct mac_lomac *source, *dest; 1508 1509 source = SLOT(mrecvlabel); 1510 dest = SLOT(msendlabel); 1511 1512 lomac_copy_single(source, dest); 1513 } 1514 1515 static void 1516 lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1517 struct mbuf *m, struct label *mlabel) 1518 { 1519 struct mac_lomac *dest; 1520 1521 dest = SLOT(mlabel); 1522 1523 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1524 } 1525 1526 static void 1527 lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1528 struct mbuf *m, struct label *mlabel) 1529 { 1530 struct mac_lomac *dest; 1531 1532 dest = SLOT(mlabel); 1533 1534 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1535 } 1536 1537 static int 1538 lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1539 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1540 { 1541 1542 if (!lomac_enabled) 1543 return (0); 1544 1545 /* XXX: This will be implemented soon... */ 1546 1547 return (0); 1548 } 1549 1550 static int 1551 lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1552 struct label *pplabel) 1553 { 1554 struct mac_lomac *subj, *obj; 1555 1556 if (!lomac_enabled) 1557 return (0); 1558 1559 subj = SLOT(cred->cr_label); 1560 obj = SLOT(pplabel); 1561 1562 if (!lomac_dominate_single(obj, subj)) 1563 return (maybe_demote(subj, obj, "reading", "pipe", NULL)); 1564 1565 return (0); 1566 } 1567 1568 static int 1569 lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1570 struct label *pplabel, struct label *newlabel) 1571 { 1572 struct mac_lomac *subj, *obj, *new; 1573 int error; 1574 1575 new = SLOT(newlabel); 1576 subj = SLOT(cred->cr_label); 1577 obj = SLOT(pplabel); 1578 1579 /* 1580 * If there is a LOMAC label update for a pipe, it must be a single 1581 * update. 1582 */ 1583 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); 1584 if (error) 1585 return (error); 1586 1587 /* 1588 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must 1589 * authorize the relabel. 1590 */ 1591 if (!lomac_single_in_range(obj, subj)) 1592 return (EPERM); 1593 1594 /* 1595 * If the LOMAC label is to be changed, authorize as appropriate. 1596 */ 1597 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 1598 /* 1599 * To change the LOMAC label on a pipe, the new pipe label 1600 * must be in the subject range. 1601 */ 1602 if (!lomac_single_in_range(new, subj)) 1603 return (EPERM); 1604 1605 /* 1606 * To change the LOMAC label on a pipe to be EQUAL, the 1607 * subject must have appropriate privilege. 1608 */ 1609 if (lomac_contains_equal(new)) { 1610 error = lomac_subject_privileged(subj); 1611 if (error) 1612 return (error); 1613 } 1614 } 1615 1616 return (0); 1617 } 1618 1619 static int 1620 lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1621 struct label *pplabel) 1622 { 1623 struct mac_lomac *subj, *obj; 1624 1625 if (!lomac_enabled) 1626 return (0); 1627 1628 subj = SLOT(cred->cr_label); 1629 obj = SLOT(pplabel); 1630 1631 if (!lomac_subject_dominate(subj, obj)) 1632 return (EACCES); 1633 1634 return (0); 1635 } 1636 1637 static void 1638 lomac_pipe_create(struct ucred *cred, struct pipepair *pp, 1639 struct label *pplabel) 1640 { 1641 struct mac_lomac *source, *dest; 1642 1643 source = SLOT(cred->cr_label); 1644 dest = SLOT(pplabel); 1645 1646 lomac_copy_single(source, dest); 1647 } 1648 1649 static void 1650 lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1651 struct label *pplabel, struct label *newlabel) 1652 { 1653 struct mac_lomac *source, *dest; 1654 1655 source = SLOT(newlabel); 1656 dest = SLOT(pplabel); 1657 1658 try_relabel(source, dest); 1659 } 1660 1661 /* 1662 * Some system privileges are allowed regardless of integrity grade; others 1663 * are allowed only when running with privilege with respect to the LOMAC 1664 * policy as they might otherwise allow bypassing of the integrity policy. 1665 */ 1666 static int 1667 lomac_priv_check(struct ucred *cred, int priv) 1668 { 1669 struct mac_lomac *subj; 1670 int error; 1671 1672 if (!lomac_enabled) 1673 return (0); 1674 1675 /* 1676 * Exempt only specific privileges from the LOMAC integrity policy. 1677 */ 1678 switch (priv) { 1679 case PRIV_KTRACE: 1680 case PRIV_MSGBUF: 1681 1682 /* 1683 * Allow processes to manipulate basic process audit properties, and 1684 * to submit audit records. 1685 */ 1686 case PRIV_AUDIT_GETAUDIT: 1687 case PRIV_AUDIT_SETAUDIT: 1688 case PRIV_AUDIT_SUBMIT: 1689 1690 /* 1691 * Allow processes to manipulate their regular UNIX credentials. 1692 */ 1693 case PRIV_CRED_SETUID: 1694 case PRIV_CRED_SETEUID: 1695 case PRIV_CRED_SETGID: 1696 case PRIV_CRED_SETEGID: 1697 case PRIV_CRED_SETGROUPS: 1698 case PRIV_CRED_SETREUID: 1699 case PRIV_CRED_SETREGID: 1700 case PRIV_CRED_SETRESUID: 1701 case PRIV_CRED_SETRESGID: 1702 1703 /* 1704 * Allow processes to perform system monitoring. 1705 */ 1706 case PRIV_SEEOTHERGIDS: 1707 case PRIV_SEEOTHERUIDS: 1708 break; 1709 1710 /* 1711 * Allow access to general process debugging facilities. We 1712 * separately control debugging based on MAC label. 1713 */ 1714 case PRIV_DEBUG_DIFFCRED: 1715 case PRIV_DEBUG_SUGID: 1716 case PRIV_DEBUG_UNPRIV: 1717 1718 /* 1719 * Allow manipulating jails. 1720 */ 1721 case PRIV_JAIL_ATTACH: 1722 1723 /* 1724 * Allow privilege with respect to the Partition policy, but not the 1725 * Privs policy. 1726 */ 1727 case PRIV_MAC_PARTITION: 1728 1729 /* 1730 * Allow privilege with respect to process resource limits and login 1731 * context. 1732 */ 1733 case PRIV_PROC_LIMIT: 1734 case PRIV_PROC_SETLOGIN: 1735 case PRIV_PROC_SETRLIMIT: 1736 1737 /* 1738 * Allow System V and POSIX IPC privileges. 1739 */ 1740 case PRIV_IPC_READ: 1741 case PRIV_IPC_WRITE: 1742 case PRIV_IPC_ADMIN: 1743 case PRIV_IPC_MSGSIZE: 1744 case PRIV_MQ_ADMIN: 1745 1746 /* 1747 * Allow certain scheduler manipulations -- possibly this should be 1748 * controlled by more fine-grained policy, as potentially low 1749 * integrity processes can deny CPU to higher integrity ones. 1750 */ 1751 case PRIV_SCHED_DIFFCRED: 1752 case PRIV_SCHED_SETPRIORITY: 1753 case PRIV_SCHED_RTPRIO: 1754 case PRIV_SCHED_SETPOLICY: 1755 case PRIV_SCHED_SET: 1756 case PRIV_SCHED_SETPARAM: 1757 1758 /* 1759 * More IPC privileges. 1760 */ 1761 case PRIV_SEM_WRITE: 1762 1763 /* 1764 * Allow signaling privileges subject to integrity policy. 1765 */ 1766 case PRIV_SIGNAL_DIFFCRED: 1767 case PRIV_SIGNAL_SUGID: 1768 1769 /* 1770 * Allow access to only limited sysctls from lower integrity levels; 1771 * piggy-back on the Jail definition. 1772 */ 1773 case PRIV_SYSCTL_WRITEJAIL: 1774 1775 /* 1776 * Allow TTY-based privileges, subject to general device access using 1777 * labels on TTY device nodes, but not console privilege. 1778 */ 1779 case PRIV_TTY_DRAINWAIT: 1780 case PRIV_TTY_DTRWAIT: 1781 case PRIV_TTY_EXCLUSIVE: 1782 case PRIV_TTY_PRISON: 1783 case PRIV_TTY_STI: 1784 case PRIV_TTY_SETA: 1785 1786 /* 1787 * Grant most VFS privileges, as almost all are in practice bounded 1788 * by more specific checks using labels. 1789 */ 1790 case PRIV_VFS_READ: 1791 case PRIV_VFS_WRITE: 1792 case PRIV_VFS_ADMIN: 1793 case PRIV_VFS_EXEC: 1794 case PRIV_VFS_LOOKUP: 1795 case PRIV_VFS_CHFLAGS_DEV: 1796 case PRIV_VFS_CHOWN: 1797 case PRIV_VFS_CHROOT: 1798 case PRIV_VFS_RETAINSUGID: 1799 case PRIV_VFS_EXCEEDQUOTA: 1800 case PRIV_VFS_FCHROOT: 1801 case PRIV_VFS_FHOPEN: 1802 case PRIV_VFS_FHSTATFS: 1803 case PRIV_VFS_GENERATION: 1804 case PRIV_VFS_GETFH: 1805 case PRIV_VFS_GETQUOTA: 1806 case PRIV_VFS_LINK: 1807 case PRIV_VFS_MOUNT: 1808 case PRIV_VFS_MOUNT_OWNER: 1809 case PRIV_VFS_MOUNT_PERM: 1810 case PRIV_VFS_MOUNT_SUIDDIR: 1811 case PRIV_VFS_MOUNT_NONUSER: 1812 case PRIV_VFS_SETGID: 1813 case PRIV_VFS_STICKYFILE: 1814 case PRIV_VFS_SYSFLAGS: 1815 case PRIV_VFS_UNMOUNT: 1816 1817 /* 1818 * Allow VM privileges; it would be nice if these were subject to 1819 * resource limits. 1820 */ 1821 case PRIV_VM_MADV_PROTECT: 1822 case PRIV_VM_MLOCK: 1823 case PRIV_VM_MUNLOCK: 1824 1825 /* 1826 * Allow some but not all network privileges. In general, dont allow 1827 * reconfiguring the network stack, just normal use. 1828 */ 1829 case PRIV_NETATALK_RESERVEDPORT: 1830 case PRIV_NETINET_RESERVEDPORT: 1831 case PRIV_NETINET_RAW: 1832 case PRIV_NETINET_REUSEPORT: 1833 case PRIV_NETIPX_RESERVEDPORT: 1834 case PRIV_NETIPX_RAW: 1835 break; 1836 1837 /* 1838 * All remaining system privileges are allow only if the process 1839 * holds privilege with respect to the LOMAC policy. 1840 */ 1841 default: 1842 subj = SLOT(cred->cr_label); 1843 error = lomac_subject_privileged(subj); 1844 if (error) 1845 return (error); 1846 } 1847 return (0); 1848 } 1849 1850 static int 1851 lomac_proc_check_debug(struct ucred *cred, struct proc *p) 1852 { 1853 struct mac_lomac *subj, *obj; 1854 1855 if (!lomac_enabled) 1856 return (0); 1857 1858 subj = SLOT(cred->cr_label); 1859 obj = SLOT(p->p_ucred->cr_label); 1860 1861 /* XXX: range checks */ 1862 if (!lomac_dominate_single(obj, subj)) 1863 return (ESRCH); 1864 if (!lomac_subject_dominate(subj, obj)) 1865 return (EACCES); 1866 1867 return (0); 1868 } 1869 1870 static int 1871 lomac_proc_check_sched(struct ucred *cred, struct proc *p) 1872 { 1873 struct mac_lomac *subj, *obj; 1874 1875 if (!lomac_enabled) 1876 return (0); 1877 1878 subj = SLOT(cred->cr_label); 1879 obj = SLOT(p->p_ucred->cr_label); 1880 1881 /* XXX: range checks */ 1882 if (!lomac_dominate_single(obj, subj)) 1883 return (ESRCH); 1884 if (!lomac_subject_dominate(subj, obj)) 1885 return (EACCES); 1886 1887 return (0); 1888 } 1889 1890 static int 1891 lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1892 { 1893 struct mac_lomac *subj, *obj; 1894 1895 if (!lomac_enabled) 1896 return (0); 1897 1898 subj = SLOT(cred->cr_label); 1899 obj = SLOT(p->p_ucred->cr_label); 1900 1901 /* XXX: range checks */ 1902 if (!lomac_dominate_single(obj, subj)) 1903 return (ESRCH); 1904 if (!lomac_subject_dominate(subj, obj)) 1905 return (EACCES); 1906 1907 return (0); 1908 } 1909 1910 static void 1911 lomac_proc_destroy_label(struct label *label) 1912 { 1913 1914 mtx_destroy(&PSLOT(label)->mtx); 1915 free(PSLOT(label), M_LOMAC); 1916 PSLOT_SET(label, NULL); 1917 } 1918 1919 static void 1920 lomac_proc_init_label(struct label *label) 1921 { 1922 1923 PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC, 1924 M_ZERO | M_WAITOK)); 1925 mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF); 1926 } 1927 1928 static int 1929 lomac_socket_check_deliver(struct socket *so, struct label *solabel, 1930 struct mbuf *m, struct label *mlabel) 1931 { 1932 struct mac_lomac *p, *s; 1933 1934 if (!lomac_enabled) 1935 return (0); 1936 1937 p = SLOT(mlabel); 1938 s = SLOT(solabel); 1939 1940 return (lomac_equal_single(p, s) ? 0 : EACCES); 1941 } 1942 1943 static int 1944 lomac_socket_check_relabel(struct ucred *cred, struct socket *so, 1945 struct label *solabel, struct label *newlabel) 1946 { 1947 struct mac_lomac *subj, *obj, *new; 1948 int error; 1949 1950 new = SLOT(newlabel); 1951 subj = SLOT(cred->cr_label); 1952 obj = SLOT(solabel); 1953 1954 /* 1955 * If there is a LOMAC label update for the socket, it may be an 1956 * update of single. 1957 */ 1958 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); 1959 if (error) 1960 return (error); 1961 1962 /* 1963 * To relabel a socket, the old socket single must be in the subject 1964 * range. 1965 */ 1966 if (!lomac_single_in_range(obj, subj)) 1967 return (EPERM); 1968 1969 /* 1970 * If the LOMAC label is to be changed, authorize as appropriate. 1971 */ 1972 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 1973 /* 1974 * To relabel a socket, the new socket single must be in the 1975 * subject range. 1976 */ 1977 if (!lomac_single_in_range(new, subj)) 1978 return (EPERM); 1979 1980 /* 1981 * To change the LOMAC label on the socket to contain EQUAL, 1982 * the subject must have appropriate privilege. 1983 */ 1984 if (lomac_contains_equal(new)) { 1985 error = lomac_subject_privileged(subj); 1986 if (error) 1987 return (error); 1988 } 1989 } 1990 1991 return (0); 1992 } 1993 1994 static int 1995 lomac_socket_check_visible(struct ucred *cred, struct socket *so, 1996 struct label *solabel) 1997 { 1998 struct mac_lomac *subj, *obj; 1999 2000 if (!lomac_enabled) 2001 return (0); 2002 2003 subj = SLOT(cred->cr_label); 2004 obj = SLOT(solabel); 2005 2006 if (!lomac_dominate_single(obj, subj)) 2007 return (ENOENT); 2008 2009 return (0); 2010 } 2011 2012 static void 2013 lomac_socket_create(struct ucred *cred, struct socket *so, 2014 struct label *solabel) 2015 { 2016 struct mac_lomac *source, *dest; 2017 2018 source = SLOT(cred->cr_label); 2019 dest = SLOT(solabel); 2020 2021 lomac_copy_single(source, dest); 2022 } 2023 2024 static void 2025 lomac_socket_create_mbuf(struct socket *so, struct label *solabel, 2026 struct mbuf *m, struct label *mlabel) 2027 { 2028 struct mac_lomac *source, *dest; 2029 2030 source = SLOT(solabel); 2031 dest = SLOT(mlabel); 2032 2033 lomac_copy_single(source, dest); 2034 } 2035 2036 static void 2037 lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel, 2038 struct socket *newso, struct label *newsolabel) 2039 { 2040 struct mac_lomac *source, *dest; 2041 2042 source = SLOT(oldsolabel); 2043 dest = SLOT(newsolabel); 2044 2045 lomac_copy_single(source, dest); 2046 } 2047 2048 static void 2049 lomac_socket_relabel(struct ucred *cred, struct socket *so, 2050 struct label *solabel, struct label *newlabel) 2051 { 2052 struct mac_lomac *source, *dest; 2053 2054 source = SLOT(newlabel); 2055 dest = SLOT(solabel); 2056 2057 try_relabel(source, dest); 2058 } 2059 2060 static void 2061 lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 2062 struct socket *so, struct label *sopeerlabel) 2063 { 2064 struct mac_lomac *source, *dest; 2065 2066 source = SLOT(mlabel); 2067 dest = SLOT(sopeerlabel); 2068 2069 lomac_copy_single(source, dest); 2070 } 2071 2072 static void 2073 lomac_socketpeer_set_from_socket(struct socket *oldso, 2074 struct label *oldsolabel, struct socket *newso, 2075 struct label *newsopeerlabel) 2076 { 2077 struct mac_lomac *source, *dest; 2078 2079 source = SLOT(oldsolabel); 2080 dest = SLOT(newsopeerlabel); 2081 2082 lomac_copy_single(source, dest); 2083 } 2084 2085 static void 2086 lomac_syncache_create(struct label *label, struct inpcb *inp) 2087 { 2088 struct mac_lomac *source, *dest; 2089 2090 source = SLOT(inp->inp_label); 2091 dest = SLOT(label); 2092 lomac_copy(source, dest); 2093 } 2094 2095 static void 2096 lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2097 struct label *mlabel) 2098 { 2099 struct mac_lomac *source, *dest; 2100 2101 source = SLOT(sc_label); 2102 dest = SLOT(mlabel); 2103 lomac_copy(source, dest); 2104 } 2105 2106 static int 2107 lomac_system_check_acct(struct ucred *cred, struct vnode *vp, 2108 struct label *vplabel) 2109 { 2110 struct mac_lomac *subj, *obj; 2111 2112 if (!lomac_enabled) 2113 return (0); 2114 2115 subj = SLOT(cred->cr_label); 2116 obj = SLOT(vplabel); 2117 2118 if (lomac_subject_privileged(subj)) 2119 return (EPERM); 2120 2121 if (!lomac_high_single(obj)) 2122 return (EACCES); 2123 2124 return (0); 2125 } 2126 2127 static int 2128 lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2129 struct label *vplabel) 2130 { 2131 struct mac_lomac *subj, *obj; 2132 2133 if (!lomac_enabled) 2134 return (0); 2135 2136 subj = SLOT(cred->cr_label); 2137 obj = SLOT(vplabel); 2138 2139 if (lomac_subject_privileged(subj)) 2140 return (EPERM); 2141 2142 if (!lomac_high_single(obj)) 2143 return (EACCES); 2144 2145 return (0); 2146 } 2147 2148 static int 2149 lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2150 struct label *vplabel) 2151 { 2152 struct mac_lomac *subj; 2153 2154 if (!lomac_enabled) 2155 return (0); 2156 2157 subj = SLOT(cred->cr_label); 2158 2159 if (lomac_subject_privileged(subj)) 2160 return (EPERM); 2161 2162 return (0); 2163 } 2164 2165 static int 2166 lomac_system_check_swapon(struct ucred *cred, struct vnode *vp, 2167 struct label *vplabel) 2168 { 2169 struct mac_lomac *subj, *obj; 2170 2171 if (!lomac_enabled) 2172 return (0); 2173 2174 subj = SLOT(cred->cr_label); 2175 obj = SLOT(vplabel); 2176 2177 if (lomac_subject_privileged(subj)) 2178 return (EPERM); 2179 2180 if (!lomac_high_single(obj)) 2181 return (EACCES); 2182 2183 return (0); 2184 } 2185 2186 static int 2187 lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2188 void *arg1, int arg2, struct sysctl_req *req) 2189 { 2190 struct mac_lomac *subj; 2191 2192 if (!lomac_enabled) 2193 return (0); 2194 2195 subj = SLOT(cred->cr_label); 2196 2197 /* 2198 * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high, 2199 * but also require privilege to change them. 2200 */ 2201 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2202 #ifdef notdef 2203 if (!lomac_subject_dominate_high(subj)) 2204 return (EACCES); 2205 #endif 2206 2207 if (lomac_subject_privileged(subj)) 2208 return (EPERM); 2209 } 2210 2211 return (0); 2212 } 2213 2214 static void 2215 lomac_thread_userret(struct thread *td) 2216 { 2217 struct proc *p = td->td_proc; 2218 struct mac_lomac_proc *subj = PSLOT(p->p_label); 2219 struct ucred *newcred, *oldcred; 2220 int dodrop; 2221 2222 mtx_lock(&subj->mtx); 2223 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) { 2224 dodrop = 0; 2225 mtx_unlock(&subj->mtx); 2226 newcred = crget(); 2227 /* 2228 * Prevent a lock order reversal in mac_proc_vm_revoke; 2229 * ideally, the other user of subj->mtx wouldn't be holding 2230 * Giant. 2231 */ 2232 mtx_lock(&Giant); 2233 PROC_LOCK(p); 2234 mtx_lock(&subj->mtx); 2235 /* 2236 * Check if we lost the race while allocating the cred. 2237 */ 2238 if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) { 2239 crfree(newcred); 2240 goto out; 2241 } 2242 oldcred = p->p_ucred; 2243 crcopy(newcred, oldcred); 2244 crhold(newcred); 2245 lomac_copy(&subj->mac_lomac, SLOT(newcred->cr_label)); 2246 p->p_ucred = newcred; 2247 crfree(oldcred); 2248 dodrop = 1; 2249 out: 2250 mtx_unlock(&subj->mtx); 2251 PROC_UNLOCK(p); 2252 if (dodrop) 2253 mac_proc_vm_revoke(curthread); 2254 mtx_unlock(&Giant); 2255 } else { 2256 mtx_unlock(&subj->mtx); 2257 } 2258 } 2259 2260 static int 2261 lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2262 struct vnode *vp, struct label *vplabel) 2263 { 2264 struct mac_lomac ml_temp, *source, *dest; 2265 int buflen, error; 2266 2267 source = SLOT(mplabel); 2268 dest = SLOT(vplabel); 2269 2270 buflen = sizeof(ml_temp); 2271 bzero(&ml_temp, buflen); 2272 2273 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2274 MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread); 2275 if (error == ENOATTR || error == EOPNOTSUPP) { 2276 /* Fall back to the mntlabel. */ 2277 lomac_copy_single(source, dest); 2278 return (0); 2279 } else if (error) 2280 return (error); 2281 2282 if (buflen != sizeof(ml_temp)) { 2283 if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) { 2284 printf("lomac_vnode_associate_extattr: bad size %d\n", 2285 buflen); 2286 return (EPERM); 2287 } 2288 bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle)); 2289 buflen = sizeof(ml_temp); 2290 (void)vn_extattr_set(vp, IO_NODELOCKED, 2291 MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME, 2292 buflen, (char *)&ml_temp, curthread); 2293 } 2294 if (lomac_valid(&ml_temp) != 0) { 2295 printf("lomac_vnode_associate_extattr: invalid\n"); 2296 return (EPERM); 2297 } 2298 if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) != 2299 MAC_LOMAC_FLAG_SINGLE) { 2300 printf("lomac_vnode_associate_extattr: not single\n"); 2301 return (EPERM); 2302 } 2303 2304 lomac_copy_single(&ml_temp, dest); 2305 return (0); 2306 } 2307 2308 static void 2309 lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2310 struct vnode *vp, struct label *vplabel) 2311 { 2312 struct mac_lomac *source, *dest; 2313 2314 source = SLOT(mplabel); 2315 dest = SLOT(vplabel); 2316 2317 lomac_copy_single(source, dest); 2318 } 2319 2320 static int 2321 lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2322 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2323 { 2324 struct mac_lomac *subj, *obj; 2325 2326 if (!lomac_enabled) 2327 return (0); 2328 2329 subj = SLOT(cred->cr_label); 2330 obj = SLOT(dvplabel); 2331 2332 if (!lomac_subject_dominate(subj, obj)) 2333 return (EACCES); 2334 if (obj->ml_flags & MAC_LOMAC_FLAG_AUX && 2335 !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle)) 2336 return (EACCES); 2337 2338 return (0); 2339 } 2340 2341 static int 2342 lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2343 struct label *vplabel, acl_type_t type) 2344 { 2345 struct mac_lomac *subj, *obj; 2346 2347 if (!lomac_enabled) 2348 return (0); 2349 2350 subj = SLOT(cred->cr_label); 2351 obj = SLOT(vplabel); 2352 2353 if (!lomac_subject_dominate(subj, obj)) 2354 return (EACCES); 2355 2356 return (0); 2357 } 2358 2359 static int 2360 lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2361 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2362 struct componentname *cnp) 2363 { 2364 struct mac_lomac *subj, *obj; 2365 2366 if (!lomac_enabled) 2367 return (0); 2368 2369 subj = SLOT(cred->cr_label); 2370 obj = SLOT(dvplabel); 2371 2372 if (!lomac_subject_dominate(subj, obj)) 2373 return (EACCES); 2374 2375 obj = SLOT(vplabel); 2376 2377 if (!lomac_subject_dominate(subj, obj)) 2378 return (EACCES); 2379 2380 return (0); 2381 } 2382 2383 static int 2384 lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2385 struct label *vplabel, int prot, int flags) 2386 { 2387 struct mac_lomac *subj, *obj; 2388 2389 /* 2390 * Rely on the use of open()-time protections to handle 2391 * non-revocation cases. 2392 */ 2393 if (!lomac_enabled) 2394 return (0); 2395 2396 subj = SLOT(cred->cr_label); 2397 obj = SLOT(vplabel); 2398 2399 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2400 if (!lomac_subject_dominate(subj, obj)) 2401 return (EACCES); 2402 } 2403 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2404 if (!lomac_dominate_single(obj, subj)) 2405 return (maybe_demote(subj, obj, "mapping", "file", vp)); 2406 } 2407 2408 return (0); 2409 } 2410 2411 static void 2412 lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp, 2413 struct label *vplabel, /* XXX vm_prot_t */ int *prot) 2414 { 2415 struct mac_lomac *subj, *obj; 2416 2417 /* 2418 * Rely on the use of open()-time protections to handle 2419 * non-revocation cases. 2420 */ 2421 if (!lomac_enabled || !revocation_enabled) 2422 return; 2423 2424 subj = SLOT(cred->cr_label); 2425 obj = SLOT(vplabel); 2426 2427 if (!lomac_subject_dominate(subj, obj)) 2428 *prot &= ~VM_PROT_WRITE; 2429 } 2430 2431 static int 2432 lomac_vnode_check_open(struct ucred *cred, struct vnode *vp, 2433 struct label *vplabel, accmode_t accmode) 2434 { 2435 struct mac_lomac *subj, *obj; 2436 2437 if (!lomac_enabled) 2438 return (0); 2439 2440 subj = SLOT(cred->cr_label); 2441 obj = SLOT(vplabel); 2442 2443 /* XXX privilege override for admin? */ 2444 if (accmode & (VWRITE | VAPPEND | VADMIN)) { 2445 if (!lomac_subject_dominate(subj, obj)) 2446 return (EACCES); 2447 } 2448 2449 return (0); 2450 } 2451 2452 static int 2453 lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2454 struct vnode *vp, struct label *vplabel) 2455 { 2456 struct mac_lomac *subj, *obj; 2457 2458 if (!lomac_enabled || !revocation_enabled) 2459 return (0); 2460 2461 subj = SLOT(active_cred->cr_label); 2462 obj = SLOT(vplabel); 2463 2464 if (!lomac_dominate_single(obj, subj)) 2465 return (maybe_demote(subj, obj, "reading", "file", vp)); 2466 2467 return (0); 2468 } 2469 2470 static int 2471 lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2472 struct label *vplabel, struct label *newlabel) 2473 { 2474 struct mac_lomac *old, *new, *subj; 2475 int error; 2476 2477 old = SLOT(vplabel); 2478 new = SLOT(newlabel); 2479 subj = SLOT(cred->cr_label); 2480 2481 /* 2482 * If there is a LOMAC label update for the vnode, it must be a 2483 * single label, with an optional explicit auxiliary single. 2484 */ 2485 error = lomac_atmostflags(new, 2486 MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX); 2487 if (error) 2488 return (error); 2489 2490 /* 2491 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must 2492 * authorize the relabel. 2493 */ 2494 if (!lomac_single_in_range(old, subj)) 2495 return (EPERM); 2496 2497 /* 2498 * If the LOMAC label is to be changed, authorize as appropriate. 2499 */ 2500 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 2501 /* 2502 * To change the LOMAC label on a vnode, the new vnode label 2503 * must be in the subject range. 2504 */ 2505 if (!lomac_single_in_range(new, subj)) 2506 return (EPERM); 2507 2508 /* 2509 * To change the LOMAC label on the vnode to be EQUAL, the 2510 * subject must have appropriate privilege. 2511 */ 2512 if (lomac_contains_equal(new)) { 2513 error = lomac_subject_privileged(subj); 2514 if (error) 2515 return (error); 2516 } 2517 } 2518 if (new->ml_flags & MAC_LOMAC_FLAG_AUX) { 2519 /* 2520 * Fill in the missing parts from the previous label. 2521 */ 2522 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 2523 lomac_copy_single(subj, new); 2524 2525 /* 2526 * To change the auxiliary LOMAC label on a vnode, the new 2527 * vnode label must be in the subject range. 2528 */ 2529 if (!lomac_auxsingle_in_range(new, subj)) 2530 return (EPERM); 2531 2532 /* 2533 * To change the auxiliary LOMAC label on the vnode to be 2534 * EQUAL, the subject must have appropriate privilege. 2535 */ 2536 if (lomac_contains_equal(new)) { 2537 error = lomac_subject_privileged(subj); 2538 if (error) 2539 return (error); 2540 } 2541 } 2542 2543 return (0); 2544 } 2545 2546 static int 2547 lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 2548 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2549 struct componentname *cnp) 2550 { 2551 struct mac_lomac *subj, *obj; 2552 2553 if (!lomac_enabled) 2554 return (0); 2555 2556 subj = SLOT(cred->cr_label); 2557 obj = SLOT(dvplabel); 2558 2559 if (!lomac_subject_dominate(subj, obj)) 2560 return (EACCES); 2561 2562 obj = SLOT(vplabel); 2563 2564 if (!lomac_subject_dominate(subj, obj)) 2565 return (EACCES); 2566 2567 return (0); 2568 } 2569 2570 static int 2571 lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 2572 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2573 int samedir, struct componentname *cnp) 2574 { 2575 struct mac_lomac *subj, *obj; 2576 2577 if (!lomac_enabled) 2578 return (0); 2579 2580 subj = SLOT(cred->cr_label); 2581 obj = SLOT(dvplabel); 2582 2583 if (!lomac_subject_dominate(subj, obj)) 2584 return (EACCES); 2585 2586 if (vp != NULL) { 2587 obj = SLOT(vplabel); 2588 2589 if (!lomac_subject_dominate(subj, obj)) 2590 return (EACCES); 2591 } 2592 2593 return (0); 2594 } 2595 2596 static int 2597 lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 2598 struct label *vplabel) 2599 { 2600 struct mac_lomac *subj, *obj; 2601 2602 if (!lomac_enabled) 2603 return (0); 2604 2605 subj = SLOT(cred->cr_label); 2606 obj = SLOT(vplabel); 2607 2608 if (!lomac_subject_dominate(subj, obj)) 2609 return (EACCES); 2610 2611 return (0); 2612 } 2613 2614 static int 2615 lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 2616 struct label *vplabel, acl_type_t type, struct acl *acl) 2617 { 2618 struct mac_lomac *subj, *obj; 2619 2620 if (!lomac_enabled) 2621 return (0); 2622 2623 subj = SLOT(cred->cr_label); 2624 obj = SLOT(vplabel); 2625 2626 if (!lomac_subject_dominate(subj, obj)) 2627 return (EACCES); 2628 2629 return (0); 2630 } 2631 2632 static int 2633 lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 2634 struct label *vplabel, int attrnamespace, const char *name, 2635 struct uio *uio) 2636 { 2637 struct mac_lomac *subj, *obj; 2638 2639 if (!lomac_enabled) 2640 return (0); 2641 2642 subj = SLOT(cred->cr_label); 2643 obj = SLOT(vplabel); 2644 2645 if (!lomac_subject_dominate(subj, obj)) 2646 return (EACCES); 2647 2648 /* XXX: protect the MAC EA in a special way? */ 2649 2650 return (0); 2651 } 2652 2653 static int 2654 lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 2655 struct label *vplabel, u_long flags) 2656 { 2657 struct mac_lomac *subj, *obj; 2658 2659 if (!lomac_enabled) 2660 return (0); 2661 2662 subj = SLOT(cred->cr_label); 2663 obj = SLOT(vplabel); 2664 2665 if (!lomac_subject_dominate(subj, obj)) 2666 return (EACCES); 2667 2668 return (0); 2669 } 2670 2671 static int 2672 lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 2673 struct label *vplabel, mode_t mode) 2674 { 2675 struct mac_lomac *subj, *obj; 2676 2677 if (!lomac_enabled) 2678 return (0); 2679 2680 subj = SLOT(cred->cr_label); 2681 obj = SLOT(vplabel); 2682 2683 if (!lomac_subject_dominate(subj, obj)) 2684 return (EACCES); 2685 2686 return (0); 2687 } 2688 2689 static int 2690 lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 2691 struct label *vplabel, uid_t uid, gid_t gid) 2692 { 2693 struct mac_lomac *subj, *obj; 2694 2695 if (!lomac_enabled) 2696 return (0); 2697 2698 subj = SLOT(cred->cr_label); 2699 obj = SLOT(vplabel); 2700 2701 if (!lomac_subject_dominate(subj, obj)) 2702 return (EACCES); 2703 2704 return (0); 2705 } 2706 2707 static int 2708 lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 2709 struct label *vplabel, struct timespec atime, struct timespec mtime) 2710 { 2711 struct mac_lomac *subj, *obj; 2712 2713 if (!lomac_enabled) 2714 return (0); 2715 2716 subj = SLOT(cred->cr_label); 2717 obj = SLOT(vplabel); 2718 2719 if (!lomac_subject_dominate(subj, obj)) 2720 return (EACCES); 2721 2722 return (0); 2723 } 2724 2725 static int 2726 lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 2727 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2728 struct componentname *cnp) 2729 { 2730 struct mac_lomac *subj, *obj; 2731 2732 if (!lomac_enabled) 2733 return (0); 2734 2735 subj = SLOT(cred->cr_label); 2736 obj = SLOT(dvplabel); 2737 2738 if (!lomac_subject_dominate(subj, obj)) 2739 return (EACCES); 2740 2741 obj = SLOT(vplabel); 2742 2743 if (!lomac_subject_dominate(subj, obj)) 2744 return (EACCES); 2745 2746 return (0); 2747 } 2748 2749 static int 2750 lomac_vnode_check_write(struct ucred *active_cred, 2751 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 2752 { 2753 struct mac_lomac *subj, *obj; 2754 2755 if (!lomac_enabled || !revocation_enabled) 2756 return (0); 2757 2758 subj = SLOT(active_cred->cr_label); 2759 obj = SLOT(vplabel); 2760 2761 if (!lomac_subject_dominate(subj, obj)) 2762 return (EACCES); 2763 2764 return (0); 2765 } 2766 2767 static int 2768 lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp, 2769 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 2770 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 2771 { 2772 struct mac_lomac *source, *dest, *dir, temp; 2773 size_t buflen; 2774 int error; 2775 2776 buflen = sizeof(temp); 2777 bzero(&temp, buflen); 2778 2779 source = SLOT(cred->cr_label); 2780 dest = SLOT(vplabel); 2781 dir = SLOT(dvplabel); 2782 if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) { 2783 lomac_copy_auxsingle(dir, &temp); 2784 lomac_set_single(&temp, dir->ml_auxsingle.mle_type, 2785 dir->ml_auxsingle.mle_grade); 2786 } else { 2787 lomac_copy_single(source, &temp); 2788 } 2789 2790 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2791 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); 2792 if (error == 0) 2793 lomac_copy(&temp, dest); 2794 return (error); 2795 } 2796 2797 static void 2798 lomac_vnode_execve_transition(struct ucred *old, struct ucred *new, 2799 struct vnode *vp, struct label *vplabel, struct label *interpvplabel, 2800 struct image_params *imgp, struct label *execlabel) 2801 { 2802 struct mac_lomac *source, *dest, *obj, *robj; 2803 2804 source = SLOT(old->cr_label); 2805 dest = SLOT(new->cr_label); 2806 obj = SLOT(vplabel); 2807 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; 2808 2809 lomac_copy(source, dest); 2810 /* 2811 * If there's an auxiliary label on the real object, respect it and 2812 * assume that this level should be assumed immediately if a higher 2813 * level is currently in place. 2814 */ 2815 if (robj->ml_flags & MAC_LOMAC_FLAG_AUX && 2816 !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single) 2817 && lomac_auxsingle_in_range(robj, dest)) 2818 lomac_set_single(dest, robj->ml_auxsingle.mle_type, 2819 robj->ml_auxsingle.mle_grade); 2820 /* 2821 * Restructuring to use the execve transitioning mechanism instead of 2822 * the normal demotion mechanism here would be difficult, so just 2823 * copy the label over and perform standard demotion. This is also 2824 * non-optimal because it will result in the intermediate label "new" 2825 * being created and immediately recycled. 2826 */ 2827 if (lomac_enabled && revocation_enabled && 2828 !lomac_dominate_single(obj, source)) 2829 (void)maybe_demote(source, obj, "executing", "file", vp); 2830 } 2831 2832 static int 2833 lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp, 2834 struct label *vplabel, struct label *interpvplabel, 2835 struct image_params *imgp, struct label *execlabel) 2836 { 2837 struct mac_lomac *subj, *obj, *robj; 2838 2839 if (!lomac_enabled || !revocation_enabled) 2840 return (0); 2841 2842 subj = SLOT(old->cr_label); 2843 obj = SLOT(vplabel); 2844 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; 2845 2846 return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX && 2847 !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single) 2848 && lomac_auxsingle_in_range(robj, subj)) || 2849 !lomac_dominate_single(obj, subj)); 2850 } 2851 2852 static void 2853 lomac_vnode_relabel(struct ucred *cred, struct vnode *vp, 2854 struct label *vplabel, struct label *newlabel) 2855 { 2856 struct mac_lomac *source, *dest; 2857 2858 source = SLOT(newlabel); 2859 dest = SLOT(vplabel); 2860 2861 try_relabel(source, dest); 2862 } 2863 2864 static int 2865 lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 2866 struct label *vplabel, struct label *intlabel) 2867 { 2868 struct mac_lomac *source, temp; 2869 size_t buflen; 2870 int error; 2871 2872 buflen = sizeof(temp); 2873 bzero(&temp, buflen); 2874 2875 source = SLOT(intlabel); 2876 if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 2877 return (0); 2878 2879 lomac_copy_single(source, &temp); 2880 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2881 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); 2882 return (error); 2883 } 2884 2885 static struct mac_policy_ops lomac_ops = 2886 { 2887 .mpo_init = lomac_init, 2888 2889 .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive, 2890 .mpo_bpfdesc_create = lomac_bpfdesc_create, 2891 .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf, 2892 .mpo_bpfdesc_destroy_label = lomac_destroy_label, 2893 .mpo_bpfdesc_init_label = lomac_init_label, 2894 2895 .mpo_cred_check_relabel = lomac_cred_check_relabel, 2896 .mpo_cred_check_visible = lomac_cred_check_visible, 2897 .mpo_cred_copy_label = lomac_copy_label, 2898 .mpo_cred_create_swapper = lomac_cred_create_swapper, 2899 .mpo_cred_create_init = lomac_cred_create_init, 2900 .mpo_cred_destroy_label = lomac_destroy_label, 2901 .mpo_cred_externalize_label = lomac_externalize_label, 2902 .mpo_cred_init_label = lomac_init_label, 2903 .mpo_cred_internalize_label = lomac_internalize_label, 2904 .mpo_cred_relabel = lomac_cred_relabel, 2905 2906 .mpo_devfs_create_device = lomac_devfs_create_device, 2907 .mpo_devfs_create_directory = lomac_devfs_create_directory, 2908 .mpo_devfs_create_symlink = lomac_devfs_create_symlink, 2909 .mpo_devfs_destroy_label = lomac_destroy_label, 2910 .mpo_devfs_init_label = lomac_init_label, 2911 .mpo_devfs_update = lomac_devfs_update, 2912 .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate, 2913 2914 .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel, 2915 .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit, 2916 .mpo_ifnet_copy_label = lomac_copy_label, 2917 .mpo_ifnet_create = lomac_ifnet_create, 2918 .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf, 2919 .mpo_ifnet_destroy_label = lomac_destroy_label, 2920 .mpo_ifnet_externalize_label = lomac_externalize_label, 2921 .mpo_ifnet_init_label = lomac_init_label, 2922 .mpo_ifnet_internalize_label = lomac_internalize_label, 2923 .mpo_ifnet_relabel = lomac_ifnet_relabel, 2924 2925 .mpo_syncache_create = lomac_syncache_create, 2926 .mpo_syncache_destroy_label = lomac_destroy_label, 2927 .mpo_syncache_init_label = lomac_init_label_waitcheck, 2928 2929 .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver, 2930 .mpo_inpcb_check_visible = lomac_inpcb_check_visible, 2931 .mpo_inpcb_create = lomac_inpcb_create, 2932 .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf, 2933 .mpo_inpcb_destroy_label = lomac_destroy_label, 2934 .mpo_inpcb_init_label = lomac_init_label_waitcheck, 2935 .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel, 2936 2937 .mpo_ip6q_create = lomac_ip6q_create, 2938 .mpo_ip6q_destroy_label = lomac_destroy_label, 2939 .mpo_ip6q_init_label = lomac_init_label_waitcheck, 2940 .mpo_ip6q_match = lomac_ip6q_match, 2941 .mpo_ip6q_reassemble = lomac_ip6q_reassemble, 2942 .mpo_ip6q_update = lomac_ip6q_update, 2943 2944 .mpo_ipq_create = lomac_ipq_create, 2945 .mpo_ipq_destroy_label = lomac_destroy_label, 2946 .mpo_ipq_init_label = lomac_init_label_waitcheck, 2947 .mpo_ipq_match = lomac_ipq_match, 2948 .mpo_ipq_reassemble = lomac_ipq_reassemble, 2949 .mpo_ipq_update = lomac_ipq_update, 2950 2951 .mpo_kld_check_load = lomac_kld_check_load, 2952 2953 .mpo_mbuf_copy_label = lomac_copy_label, 2954 .mpo_mbuf_destroy_label = lomac_destroy_label, 2955 .mpo_mbuf_init_label = lomac_init_label_waitcheck, 2956 2957 .mpo_mount_create = lomac_mount_create, 2958 .mpo_mount_destroy_label = lomac_destroy_label, 2959 .mpo_mount_init_label = lomac_init_label, 2960 2961 .mpo_netatalk_aarp_send = lomac_netatalk_aarp_send, 2962 2963 .mpo_netinet_arp_send = lomac_netinet_arp_send, 2964 .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply, 2965 .mpo_netinet_firewall_send = lomac_netinet_firewall_send, 2966 .mpo_netinet_fragment = lomac_netinet_fragment, 2967 .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply, 2968 .mpo_netinet_igmp_send = lomac_netinet_igmp_send, 2969 2970 .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send, 2971 2972 .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl, 2973 .mpo_pipe_check_read = lomac_pipe_check_read, 2974 .mpo_pipe_check_relabel = lomac_pipe_check_relabel, 2975 .mpo_pipe_check_write = lomac_pipe_check_write, 2976 .mpo_pipe_copy_label = lomac_copy_label, 2977 .mpo_pipe_create = lomac_pipe_create, 2978 .mpo_pipe_destroy_label = lomac_destroy_label, 2979 .mpo_pipe_externalize_label = lomac_externalize_label, 2980 .mpo_pipe_init_label = lomac_init_label, 2981 .mpo_pipe_internalize_label = lomac_internalize_label, 2982 .mpo_pipe_relabel = lomac_pipe_relabel, 2983 2984 .mpo_priv_check = lomac_priv_check, 2985 2986 .mpo_proc_check_debug = lomac_proc_check_debug, 2987 .mpo_proc_check_sched = lomac_proc_check_sched, 2988 .mpo_proc_check_signal = lomac_proc_check_signal, 2989 .mpo_proc_destroy_label = lomac_proc_destroy_label, 2990 .mpo_proc_init_label = lomac_proc_init_label, 2991 2992 .mpo_socket_check_deliver = lomac_socket_check_deliver, 2993 .mpo_socket_check_relabel = lomac_socket_check_relabel, 2994 .mpo_socket_check_visible = lomac_socket_check_visible, 2995 .mpo_socket_copy_label = lomac_copy_label, 2996 .mpo_socket_create = lomac_socket_create, 2997 .mpo_socket_create_mbuf = lomac_socket_create_mbuf, 2998 .mpo_socket_destroy_label = lomac_destroy_label, 2999 .mpo_socket_externalize_label = lomac_externalize_label, 3000 .mpo_socket_init_label = lomac_init_label_waitcheck, 3001 .mpo_socket_internalize_label = lomac_internalize_label, 3002 .mpo_socket_newconn = lomac_socket_newconn, 3003 .mpo_socket_relabel = lomac_socket_relabel, 3004 3005 .mpo_socketpeer_destroy_label = lomac_destroy_label, 3006 .mpo_socketpeer_externalize_label = lomac_externalize_label, 3007 .mpo_socketpeer_init_label = lomac_init_label_waitcheck, 3008 .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf, 3009 .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket, 3010 3011 .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf, 3012 3013 .mpo_system_check_acct = lomac_system_check_acct, 3014 .mpo_system_check_auditctl = lomac_system_check_auditctl, 3015 .mpo_system_check_swapoff = lomac_system_check_swapoff, 3016 .mpo_system_check_swapon = lomac_system_check_swapon, 3017 .mpo_system_check_sysctl = lomac_system_check_sysctl, 3018 3019 .mpo_thread_userret = lomac_thread_userret, 3020 3021 .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr, 3022 .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel, 3023 .mpo_vnode_check_access = lomac_vnode_check_open, 3024 .mpo_vnode_check_create = lomac_vnode_check_create, 3025 .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl, 3026 .mpo_vnode_check_link = lomac_vnode_check_link, 3027 .mpo_vnode_check_mmap = lomac_vnode_check_mmap, 3028 .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade, 3029 .mpo_vnode_check_open = lomac_vnode_check_open, 3030 .mpo_vnode_check_read = lomac_vnode_check_read, 3031 .mpo_vnode_check_relabel = lomac_vnode_check_relabel, 3032 .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from, 3033 .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to, 3034 .mpo_vnode_check_revoke = lomac_vnode_check_revoke, 3035 .mpo_vnode_check_setacl = lomac_vnode_check_setacl, 3036 .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr, 3037 .mpo_vnode_check_setflags = lomac_vnode_check_setflags, 3038 .mpo_vnode_check_setmode = lomac_vnode_check_setmode, 3039 .mpo_vnode_check_setowner = lomac_vnode_check_setowner, 3040 .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes, 3041 .mpo_vnode_check_unlink = lomac_vnode_check_unlink, 3042 .mpo_vnode_check_write = lomac_vnode_check_write, 3043 .mpo_vnode_copy_label = lomac_copy_label, 3044 .mpo_vnode_create_extattr = lomac_vnode_create_extattr, 3045 .mpo_vnode_destroy_label = lomac_destroy_label, 3046 .mpo_vnode_execve_transition = lomac_vnode_execve_transition, 3047 .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition, 3048 .mpo_vnode_externalize_label = lomac_externalize_label, 3049 .mpo_vnode_init_label = lomac_init_label, 3050 .mpo_vnode_internalize_label = lomac_internalize_label, 3051 .mpo_vnode_relabel = lomac_vnode_relabel, 3052 .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr, 3053 }; 3054 3055 MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC", 3056 MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot); 3057