fxr.watson.org: FREEBSD-8-STABLE sys/security/mac_lomac/mac

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sys/security/mac_lomac/mac_lomac.c

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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 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, "pts/", strlen("pts/")) == 0 || 1047 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0)) 1048 lomac_type = MAC_LOMAC_TYPE_EQUAL; 1049 else 1050 lomac_type = MAC_LOMAC_TYPE_HIGH; 1051 lomac_set_single(ml, lomac_type, 0); 1052 } 1053 1054 static void 1055 lomac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 1056 struct devfs_dirent *de, struct label *delabel) 1057 { 1058 struct mac_lomac *ml; 1059 1060 ml = SLOT(delabel); 1061 lomac_set_single(ml, MAC_LOMAC_TYPE_HIGH, 0); 1062 } 1063 1064 static void 1065 lomac_devfs_create_symlink(struct ucred *cred, struct mount *mp, 1066 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 1067 struct label *delabel) 1068 { 1069 struct mac_lomac *source, *dest; 1070 1071 source = SLOT(cred->cr_label); 1072 dest = SLOT(delabel); 1073 1074 lomac_copy_single(source, dest); 1075 } 1076 1077 static void 1078 lomac_devfs_update(struct mount *mp, struct devfs_dirent *de, 1079 struct label *delabel, struct vnode *vp, struct label *vplabel) 1080 { 1081 struct mac_lomac *source, *dest; 1082 1083 source = SLOT(vplabel); 1084 dest = SLOT(delabel); 1085 1086 lomac_copy(source, dest); 1087 } 1088 1089 static void 1090 lomac_devfs_vnode_associate(struct mount *mp, struct label *mplabel, 1091 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 1092 struct label *vplabel) 1093 { 1094 struct mac_lomac *source, *dest; 1095 1096 source = SLOT(delabel); 1097 dest = SLOT(vplabel); 1098 1099 lomac_copy_single(source, dest); 1100 } 1101 1102 static int 1103 lomac_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1104 struct label *ifplabel, struct label *newlabel) 1105 { 1106 struct mac_lomac *subj, *new; 1107 int error; 1108 1109 subj = SLOT(cred->cr_label); 1110 new = SLOT(newlabel); 1111 1112 /* 1113 * If there is a LOMAC label update for the interface, it may be an 1114 * update of the single, range, or both. 1115 */ 1116 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH); 1117 if (error) 1118 return (error); 1119 1120 /* 1121 * Relabling network interfaces requires LOMAC privilege. 1122 */ 1123 error = lomac_subject_privileged(subj); 1124 if (error) 1125 return (error); 1126 1127 /* 1128 * If the LOMAC label is to be changed, authorize as appropriate. 1129 */ 1130 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) { 1131 /* 1132 * Fill in the missing parts from the previous label. 1133 */ 1134 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 1135 lomac_copy_single(subj, new); 1136 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0) 1137 lomac_copy_range(subj, new); 1138 1139 /* 1140 * Rely on the traditional superuser status for the LOMAC 1141 * interface relabel requirements. XXXMAC: This will go 1142 * away. 1143 * 1144 * XXXRW: This is also redundant to a higher layer check. 1145 */ 1146 error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 0); 1147 if (error) 1148 return (EPERM); 1149 1150 /* 1151 * XXXMAC: Additional consistency tests regarding the single 1152 * and the range of the new label might be performed here. 1153 */ 1154 } 1155 1156 return (0); 1157 } 1158 1159 static int 1160 lomac_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1161 struct mbuf *m, struct label *mlabel) 1162 { 1163 struct mac_lomac *p, *i; 1164 1165 if (!lomac_enabled) 1166 return (0); 1167 1168 p = SLOT(mlabel); 1169 i = SLOT(ifplabel); 1170 1171 return (lomac_single_in_range(p, i) ? 0 : EACCES); 1172 } 1173 1174 static void 1175 lomac_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1176 { 1177 char tifname[IFNAMSIZ], *p, *q; 1178 char tiflist[sizeof(trusted_interfaces)]; 1179 struct mac_lomac *dest; 1180 int len, grade; 1181 1182 dest = SLOT(ifplabel); 1183 1184 if (ifp->if_type == IFT_LOOP) { 1185 grade = MAC_LOMAC_TYPE_EQUAL; 1186 goto set; 1187 } 1188 1189 if (trust_all_interfaces) { 1190 grade = MAC_LOMAC_TYPE_HIGH; 1191 goto set; 1192 } 1193 1194 grade = MAC_LOMAC_TYPE_LOW; 1195 1196 if (trusted_interfaces[0] == '\0' || 1197 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1198 goto set; 1199 1200 bzero(tiflist, sizeof(tiflist)); 1201 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1202 if(*p != ' ' && *p != '\t') 1203 *q = *p; 1204 1205 for (p = q = tiflist;; p++) { 1206 if (*p == ',' || *p == '\0') { 1207 len = p - q; 1208 if (len < IFNAMSIZ) { 1209 bzero(tifname, sizeof(tifname)); 1210 bcopy(q, tifname, len); 1211 if (strcmp(tifname, ifp->if_xname) == 0) { 1212 grade = MAC_LOMAC_TYPE_HIGH; 1213 break; 1214 } 1215 } 1216 else { 1217 *p = '\0'; 1218 printf("MAC/LOMAC warning: interface name " 1219 "\"%s\" is too long (must be < %d)\n", 1220 q, IFNAMSIZ); 1221 } 1222 if (*p == '\0') 1223 break; 1224 q = p + 1; 1225 } 1226 } 1227 set: 1228 lomac_set_single(dest, grade, 0); 1229 lomac_set_range(dest, grade, 0, grade, 0); 1230 } 1231 1232 static void 1233 lomac_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1234 struct mbuf *m, struct label *mlabel) 1235 { 1236 struct mac_lomac *source, *dest; 1237 1238 source = SLOT(ifplabel); 1239 dest = SLOT(mlabel); 1240 1241 lomac_copy_single(source, dest); 1242 } 1243 1244 static void 1245 lomac_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1246 struct label *ifplabel, struct label *newlabel) 1247 { 1248 struct mac_lomac *source, *dest; 1249 1250 source = SLOT(newlabel); 1251 dest = SLOT(ifplabel); 1252 1253 try_relabel(source, dest); 1254 } 1255 1256 static int 1257 lomac_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1258 struct mbuf *m, struct label *mlabel) 1259 { 1260 struct mac_lomac *p, *i; 1261 1262 if (!lomac_enabled) 1263 return (0); 1264 1265 p = SLOT(mlabel); 1266 i = SLOT(inplabel); 1267 1268 return (lomac_equal_single(p, i) ? 0 : EACCES); 1269 } 1270 1271 static int 1272 lomac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, 1273 struct label *inplabel) 1274 { 1275 struct mac_lomac *subj, *obj; 1276 1277 if (!lomac_enabled) 1278 return (0); 1279 1280 subj = SLOT(cred->cr_label); 1281 obj = SLOT(inplabel); 1282 1283 if (!lomac_dominate_single(obj, subj)) 1284 return (ENOENT); 1285 1286 return (0); 1287 } 1288 1289 static void 1290 lomac_inpcb_create(struct socket *so, struct label *solabel, 1291 struct inpcb *inp, struct label *inplabel) 1292 { 1293 struct mac_lomac *source, *dest; 1294 1295 source = SLOT(solabel); 1296 dest = SLOT(inplabel); 1297 1298 lomac_copy_single(source, dest); 1299 } 1300 1301 static void 1302 lomac_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1303 struct mbuf *m, struct label *mlabel) 1304 { 1305 struct mac_lomac *source, *dest; 1306 1307 source = SLOT(inplabel); 1308 dest = SLOT(mlabel); 1309 1310 lomac_copy_single(source, dest); 1311 } 1312 1313 static void 1314 lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1315 struct inpcb *inp, struct label *inplabel) 1316 { 1317 struct mac_lomac *source, *dest; 1318 1319 SOCK_LOCK_ASSERT(so); 1320 1321 source = SLOT(solabel); 1322 dest = SLOT(inplabel); 1323 1324 lomac_copy_single(source, dest); 1325 } 1326 1327 static void 1328 lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1329 struct label *q6label) 1330 { 1331 struct mac_lomac *source, *dest; 1332 1333 source = SLOT(mlabel); 1334 dest = SLOT(q6label); 1335 1336 lomac_copy_single(source, dest); 1337 } 1338 1339 static int 1340 lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1341 struct label *q6label) 1342 { 1343 struct mac_lomac *a, *b; 1344 1345 a = SLOT(q6label); 1346 b = SLOT(mlabel); 1347 1348 return (lomac_equal_single(a, b)); 1349 } 1350 1351 static void 1352 lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, 1353 struct label *mlabel) 1354 { 1355 struct mac_lomac *source, *dest; 1356 1357 source = SLOT(q6label); 1358 dest = SLOT(mlabel); 1359 1360 /* Just use the head, since we require them all to match. */ 1361 lomac_copy_single(source, dest); 1362 } 1363 1364 static void 1365 lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6, 1366 struct label *q6label) 1367 { 1368 1369 /* NOOP: we only accept matching labels, so no need to update */ 1370 } 1371 1372 static void 1373 lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, 1374 struct label *qlabel) 1375 { 1376 struct mac_lomac *source, *dest; 1377 1378 source = SLOT(mlabel); 1379 dest = SLOT(qlabel); 1380 1381 lomac_copy_single(source, dest); 1382 } 1383 1384 static int 1385 lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, 1386 struct label *qlabel) 1387 { 1388 struct mac_lomac *a, *b; 1389 1390 a = SLOT(qlabel); 1391 b = SLOT(mlabel); 1392 1393 return (lomac_equal_single(a, b)); 1394 } 1395 1396 static void 1397 lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, 1398 struct label *mlabel) 1399 { 1400 struct mac_lomac *source, *dest; 1401 1402 source = SLOT(qlabel); 1403 dest = SLOT(mlabel); 1404 1405 /* Just use the head, since we require them all to match. */ 1406 lomac_copy_single(source, dest); 1407 } 1408 1409 static void 1410 lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, 1411 struct label *qlabel) 1412 { 1413 1414 /* NOOP: we only accept matching labels, so no need to update */ 1415 } 1416 1417 static int 1418 lomac_kld_check_load(struct ucred *cred, struct vnode *vp, 1419 struct label *vplabel) 1420 { 1421 struct mac_lomac *subj, *obj; 1422 1423 if (!lomac_enabled) 1424 return (0); 1425 1426 subj = SLOT(cred->cr_label); 1427 obj = SLOT(vplabel); 1428 1429 if (lomac_subject_privileged(subj)) 1430 return (EPERM); 1431 1432 if (!lomac_high_single(obj)) 1433 return (EACCES); 1434 1435 return (0); 1436 } 1437 1438 static void 1439 lomac_mount_create(struct ucred *cred, struct mount *mp, 1440 struct label *mplabel) 1441 { 1442 struct mac_lomac *source, *dest; 1443 1444 source = SLOT(cred->cr_label); 1445 dest = SLOT(mplabel); 1446 lomac_copy_single(source, dest); 1447 } 1448 1449 static void 1450 lomac_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel, 1451 struct mbuf *m, struct label *mlabel) 1452 { 1453 struct mac_lomac *dest; 1454 1455 dest = SLOT(mlabel); 1456 1457 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1458 } 1459 1460 static void 1461 lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, 1462 struct mbuf *m, struct label *mlabel) 1463 { 1464 struct mac_lomac *dest; 1465 1466 dest = SLOT(mlabel); 1467 1468 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1469 } 1470 1471 static void 1472 lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1473 struct mbuf *msend, struct label *msendlabel) 1474 { 1475 struct mac_lomac *source, *dest; 1476 1477 source = SLOT(mrecvlabel); 1478 dest = SLOT(msendlabel); 1479 1480 lomac_copy_single(source, dest); 1481 } 1482 1483 static void 1484 lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1485 { 1486 struct mac_lomac *dest; 1487 1488 dest = SLOT(mlabel); 1489 1490 /* XXX: where is the label for the firewall really comming from? */ 1491 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1492 } 1493 1494 static void 1495 lomac_netinet_fragment(struct mbuf *m, struct label *mlabel, 1496 struct mbuf *frag, struct label *fraglabel) 1497 { 1498 struct mac_lomac *source, *dest; 1499 1500 source = SLOT(mlabel); 1501 dest = SLOT(fraglabel); 1502 1503 lomac_copy_single(source, dest); 1504 } 1505 1506 static void 1507 lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1508 struct mbuf *msend, struct label *msendlabel) 1509 { 1510 struct mac_lomac *source, *dest; 1511 1512 source = SLOT(mrecvlabel); 1513 dest = SLOT(msendlabel); 1514 1515 lomac_copy_single(source, dest); 1516 } 1517 1518 static void 1519 lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1520 struct mbuf *m, struct label *mlabel) 1521 { 1522 struct mac_lomac *dest; 1523 1524 dest = SLOT(mlabel); 1525 1526 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1527 } 1528 1529 static void 1530 lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, 1531 struct mbuf *m, struct label *mlabel) 1532 { 1533 struct mac_lomac *dest; 1534 1535 dest = SLOT(mlabel); 1536 1537 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1538 } 1539 1540 static int 1541 lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1542 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1543 { 1544 1545 if (!lomac_enabled) 1546 return (0); 1547 1548 /* XXX: This will be implemented soon... */ 1549 1550 return (0); 1551 } 1552 1553 static int 1554 lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1555 struct label *pplabel) 1556 { 1557 struct mac_lomac *subj, *obj; 1558 1559 if (!lomac_enabled) 1560 return (0); 1561 1562 subj = SLOT(cred->cr_label); 1563 obj = SLOT(pplabel); 1564 1565 if (!lomac_dominate_single(obj, subj)) 1566 return (maybe_demote(subj, obj, "reading", "pipe", NULL)); 1567 1568 return (0); 1569 } 1570 1571 static int 1572 lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1573 struct label *pplabel, struct label *newlabel) 1574 { 1575 struct mac_lomac *subj, *obj, *new; 1576 int error; 1577 1578 new = SLOT(newlabel); 1579 subj = SLOT(cred->cr_label); 1580 obj = SLOT(pplabel); 1581 1582 /* 1583 * If there is a LOMAC label update for a pipe, it must be a single 1584 * update. 1585 */ 1586 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); 1587 if (error) 1588 return (error); 1589 1590 /* 1591 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must 1592 * authorize the relabel. 1593 */ 1594 if (!lomac_single_in_range(obj, subj)) 1595 return (EPERM); 1596 1597 /* 1598 * If the LOMAC label is to be changed, authorize as appropriate. 1599 */ 1600 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 1601 /* 1602 * To change the LOMAC label on a pipe, the new pipe label 1603 * must be in the subject range. 1604 */ 1605 if (!lomac_single_in_range(new, subj)) 1606 return (EPERM); 1607 1608 /* 1609 * To change the LOMAC label on a pipe to be EQUAL, the 1610 * subject must have appropriate privilege. 1611 */ 1612 if (lomac_contains_equal(new)) { 1613 error = lomac_subject_privileged(subj); 1614 if (error) 1615 return (error); 1616 } 1617 } 1618 1619 return (0); 1620 } 1621 1622 static int 1623 lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1624 struct label *pplabel) 1625 { 1626 struct mac_lomac *subj, *obj; 1627 1628 if (!lomac_enabled) 1629 return (0); 1630 1631 subj = SLOT(cred->cr_label); 1632 obj = SLOT(pplabel); 1633 1634 if (!lomac_subject_dominate(subj, obj)) 1635 return (EACCES); 1636 1637 return (0); 1638 } 1639 1640 static void 1641 lomac_pipe_create(struct ucred *cred, struct pipepair *pp, 1642 struct label *pplabel) 1643 { 1644 struct mac_lomac *source, *dest; 1645 1646 source = SLOT(cred->cr_label); 1647 dest = SLOT(pplabel); 1648 1649 lomac_copy_single(source, dest); 1650 } 1651 1652 static void 1653 lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1654 struct label *pplabel, struct label *newlabel) 1655 { 1656 struct mac_lomac *source, *dest; 1657 1658 source = SLOT(newlabel); 1659 dest = SLOT(pplabel); 1660 1661 try_relabel(source, dest); 1662 } 1663 1664 /* 1665 * Some system privileges are allowed regardless of integrity grade; others 1666 * are allowed only when running with privilege with respect to the LOMAC 1667 * policy as they might otherwise allow bypassing of the integrity policy. 1668 */ 1669 static int 1670 lomac_priv_check(struct ucred *cred, int priv) 1671 { 1672 struct mac_lomac *subj; 1673 int error; 1674 1675 if (!lomac_enabled) 1676 return (0); 1677 1678 /* 1679 * Exempt only specific privileges from the LOMAC integrity policy. 1680 */ 1681 switch (priv) { 1682 case PRIV_KTRACE: 1683 case PRIV_MSGBUF: 1684 1685 /* 1686 * Allow processes to manipulate basic process audit properties, and 1687 * to submit audit records. 1688 */ 1689 case PRIV_AUDIT_GETAUDIT: 1690 case PRIV_AUDIT_SETAUDIT: 1691 case PRIV_AUDIT_SUBMIT: 1692 1693 /* 1694 * Allow processes to manipulate their regular UNIX credentials. 1695 */ 1696 case PRIV_CRED_SETUID: 1697 case PRIV_CRED_SETEUID: 1698 case PRIV_CRED_SETGID: 1699 case PRIV_CRED_SETEGID: 1700 case PRIV_CRED_SETGROUPS: 1701 case PRIV_CRED_SETREUID: 1702 case PRIV_CRED_SETREGID: 1703 case PRIV_CRED_SETRESUID: 1704 case PRIV_CRED_SETRESGID: 1705 1706 /* 1707 * Allow processes to perform system monitoring. 1708 */ 1709 case PRIV_SEEOTHERGIDS: 1710 case PRIV_SEEOTHERUIDS: 1711 break; 1712 1713 /* 1714 * Allow access to general process debugging facilities. We 1715 * separately control debugging based on MAC label. 1716 */ 1717 case PRIV_DEBUG_DIFFCRED: 1718 case PRIV_DEBUG_SUGID: 1719 case PRIV_DEBUG_UNPRIV: 1720 1721 /* 1722 * Allow manipulating jails. 1723 */ 1724 case PRIV_JAIL_ATTACH: 1725 1726 /* 1727 * Allow privilege with respect to the Partition policy, but not the 1728 * Privs policy. 1729 */ 1730 case PRIV_MAC_PARTITION: 1731 1732 /* 1733 * Allow privilege with respect to process resource limits and login 1734 * context. 1735 */ 1736 case PRIV_PROC_LIMIT: 1737 case PRIV_PROC_SETLOGIN: 1738 case PRIV_PROC_SETRLIMIT: 1739 1740 /* 1741 * Allow System V and POSIX IPC privileges. 1742 */ 1743 case PRIV_IPC_READ: 1744 case PRIV_IPC_WRITE: 1745 case PRIV_IPC_ADMIN: 1746 case PRIV_IPC_MSGSIZE: 1747 case PRIV_MQ_ADMIN: 1748 1749 /* 1750 * Allow certain scheduler manipulations -- possibly this should be 1751 * controlled by more fine-grained policy, as potentially low 1752 * integrity processes can deny CPU to higher integrity ones. 1753 */ 1754 case PRIV_SCHED_DIFFCRED: 1755 case PRIV_SCHED_SETPRIORITY: 1756 case PRIV_SCHED_RTPRIO: 1757 case PRIV_SCHED_SETPOLICY: 1758 case PRIV_SCHED_SET: 1759 case PRIV_SCHED_SETPARAM: 1760 1761 /* 1762 * More IPC privileges. 1763 */ 1764 case PRIV_SEM_WRITE: 1765 1766 /* 1767 * Allow signaling privileges subject to integrity policy. 1768 */ 1769 case PRIV_SIGNAL_DIFFCRED: 1770 case PRIV_SIGNAL_SUGID: 1771 1772 /* 1773 * Allow access to only limited sysctls from lower integrity levels; 1774 * piggy-back on the Jail definition. 1775 */ 1776 case PRIV_SYSCTL_WRITEJAIL: 1777 1778 /* 1779 * Allow TTY-based privileges, subject to general device access using 1780 * labels on TTY device nodes, but not console privilege. 1781 */ 1782 case PRIV_TTY_DRAINWAIT: 1783 case PRIV_TTY_DTRWAIT: 1784 case PRIV_TTY_EXCLUSIVE: 1785 case PRIV_TTY_STI: 1786 case PRIV_TTY_SETA: 1787 1788 /* 1789 * Grant most VFS privileges, as almost all are in practice bounded 1790 * by more specific checks using labels. 1791 */ 1792 case PRIV_VFS_READ: 1793 case PRIV_VFS_WRITE: 1794 case PRIV_VFS_ADMIN: 1795 case PRIV_VFS_EXEC: 1796 case PRIV_VFS_LOOKUP: 1797 case PRIV_VFS_CHFLAGS_DEV: 1798 case PRIV_VFS_CHOWN: 1799 case PRIV_VFS_CHROOT: 1800 case PRIV_VFS_RETAINSUGID: 1801 case PRIV_VFS_EXCEEDQUOTA: 1802 case PRIV_VFS_FCHROOT: 1803 case PRIV_VFS_FHOPEN: 1804 case PRIV_VFS_FHSTATFS: 1805 case PRIV_VFS_GENERATION: 1806 case PRIV_VFS_GETFH: 1807 case PRIV_VFS_GETQUOTA: 1808 case PRIV_VFS_LINK: 1809 case PRIV_VFS_MOUNT: 1810 case PRIV_VFS_MOUNT_OWNER: 1811 case PRIV_VFS_MOUNT_PERM: 1812 case PRIV_VFS_MOUNT_SUIDDIR: 1813 case PRIV_VFS_MOUNT_NONUSER: 1814 case PRIV_VFS_SETGID: 1815 case PRIV_VFS_STICKYFILE: 1816 case PRIV_VFS_SYSFLAGS: 1817 case PRIV_VFS_UNMOUNT: 1818 1819 /* 1820 * Allow VM privileges; it would be nice if these were subject to 1821 * resource limits. 1822 */ 1823 case PRIV_VM_MADV_PROTECT: 1824 case PRIV_VM_MLOCK: 1825 case PRIV_VM_MUNLOCK: 1826 case PRIV_VM_SWAP_NOQUOTA: 1827 case PRIV_VM_SWAP_NORLIMIT: 1828 1829 /* 1830 * Allow some but not all network privileges. In general, dont allow 1831 * reconfiguring the network stack, just normal use. 1832 */ 1833 case PRIV_NETATALK_RESERVEDPORT: 1834 case PRIV_NETINET_RESERVEDPORT: 1835 case PRIV_NETINET_RAW: 1836 case PRIV_NETINET_REUSEPORT: 1837 case PRIV_NETIPX_RESERVEDPORT: 1838 case PRIV_NETIPX_RAW: 1839 break; 1840 1841 /* 1842 * All remaining system privileges are allow only if the process 1843 * holds privilege with respect to the LOMAC policy. 1844 */ 1845 default: 1846 subj = SLOT(cred->cr_label); 1847 error = lomac_subject_privileged(subj); 1848 if (error) 1849 return (error); 1850 } 1851 return (0); 1852 } 1853 1854 static int 1855 lomac_proc_check_debug(struct ucred *cred, struct proc *p) 1856 { 1857 struct mac_lomac *subj, *obj; 1858 1859 if (!lomac_enabled) 1860 return (0); 1861 1862 subj = SLOT(cred->cr_label); 1863 obj = SLOT(p->p_ucred->cr_label); 1864 1865 /* XXX: range checks */ 1866 if (!lomac_dominate_single(obj, subj)) 1867 return (ESRCH); 1868 if (!lomac_subject_dominate(subj, obj)) 1869 return (EACCES); 1870 1871 return (0); 1872 } 1873 1874 static int 1875 lomac_proc_check_sched(struct ucred *cred, struct proc *p) 1876 { 1877 struct mac_lomac *subj, *obj; 1878 1879 if (!lomac_enabled) 1880 return (0); 1881 1882 subj = SLOT(cred->cr_label); 1883 obj = SLOT(p->p_ucred->cr_label); 1884 1885 /* XXX: range checks */ 1886 if (!lomac_dominate_single(obj, subj)) 1887 return (ESRCH); 1888 if (!lomac_subject_dominate(subj, obj)) 1889 return (EACCES); 1890 1891 return (0); 1892 } 1893 1894 static int 1895 lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1896 { 1897 struct mac_lomac *subj, *obj; 1898 1899 if (!lomac_enabled) 1900 return (0); 1901 1902 subj = SLOT(cred->cr_label); 1903 obj = SLOT(p->p_ucred->cr_label); 1904 1905 /* XXX: range checks */ 1906 if (!lomac_dominate_single(obj, subj)) 1907 return (ESRCH); 1908 if (!lomac_subject_dominate(subj, obj)) 1909 return (EACCES); 1910 1911 return (0); 1912 } 1913 1914 static void 1915 lomac_proc_destroy_label(struct label *label) 1916 { 1917 1918 mtx_destroy(&PSLOT(label)->mtx); 1919 free(PSLOT(label), M_LOMAC); 1920 PSLOT_SET(label, NULL); 1921 } 1922 1923 static void 1924 lomac_proc_init_label(struct label *label) 1925 { 1926 1927 PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC, 1928 M_ZERO | M_WAITOK)); 1929 mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF); 1930 } 1931 1932 static int 1933 lomac_socket_check_deliver(struct socket *so, struct label *solabel, 1934 struct mbuf *m, struct label *mlabel) 1935 { 1936 struct mac_lomac *p, *s; 1937 int error; 1938 1939 if (!lomac_enabled) 1940 return (0); 1941 1942 p = SLOT(mlabel); 1943 s = SLOT(solabel); 1944 1945 SOCK_LOCK(so); 1946 error = lomac_equal_single(p, s) ? 0 : EACCES; 1947 SOCK_UNLOCK(so); 1948 return (error); 1949 } 1950 1951 static int 1952 lomac_socket_check_relabel(struct ucred *cred, struct socket *so, 1953 struct label *solabel, struct label *newlabel) 1954 { 1955 struct mac_lomac *subj, *obj, *new; 1956 int error; 1957 1958 SOCK_LOCK_ASSERT(so); 1959 1960 new = SLOT(newlabel); 1961 subj = SLOT(cred->cr_label); 1962 obj = SLOT(solabel); 1963 1964 /* 1965 * If there is a LOMAC label update for the socket, it may be an 1966 * update of single. 1967 */ 1968 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); 1969 if (error) 1970 return (error); 1971 1972 /* 1973 * To relabel a socket, the old socket single must be in the subject 1974 * range. 1975 */ 1976 if (!lomac_single_in_range(obj, subj)) 1977 return (EPERM); 1978 1979 /* 1980 * If the LOMAC label is to be changed, authorize as appropriate. 1981 */ 1982 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 1983 /* 1984 * To relabel a socket, the new socket single must be in the 1985 * subject range. 1986 */ 1987 if (!lomac_single_in_range(new, subj)) 1988 return (EPERM); 1989 1990 /* 1991 * To change the LOMAC label on the socket to contain EQUAL, 1992 * the subject must have appropriate privilege. 1993 */ 1994 if (lomac_contains_equal(new)) { 1995 error = lomac_subject_privileged(subj); 1996 if (error) 1997 return (error); 1998 } 1999 } 2000 2001 return (0); 2002 } 2003 2004 static int 2005 lomac_socket_check_visible(struct ucred *cred, struct socket *so, 2006 struct label *solabel) 2007 { 2008 struct mac_lomac *subj, *obj; 2009 2010 if (!lomac_enabled) 2011 return (0); 2012 2013 subj = SLOT(cred->cr_label); 2014 obj = SLOT(solabel); 2015 2016 SOCK_LOCK(so); 2017 if (!lomac_dominate_single(obj, subj)) { 2018 SOCK_UNLOCK(so); 2019 return (ENOENT); 2020 } 2021 SOCK_UNLOCK(so); 2022 2023 return (0); 2024 } 2025 2026 static void 2027 lomac_socket_create(struct ucred *cred, struct socket *so, 2028 struct label *solabel) 2029 { 2030 struct mac_lomac *source, *dest; 2031 2032 source = SLOT(cred->cr_label); 2033 dest = SLOT(solabel); 2034 2035 lomac_copy_single(source, dest); 2036 } 2037 2038 static void 2039 lomac_socket_create_mbuf(struct socket *so, struct label *solabel, 2040 struct mbuf *m, struct label *mlabel) 2041 { 2042 struct mac_lomac *source, *dest; 2043 2044 source = SLOT(solabel); 2045 dest = SLOT(mlabel); 2046 2047 SOCK_LOCK(so); 2048 lomac_copy_single(source, dest); 2049 SOCK_UNLOCK(so); 2050 } 2051 2052 static void 2053 lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel, 2054 struct socket *newso, struct label *newsolabel) 2055 { 2056 struct mac_lomac source, *dest; 2057 2058 SOCK_LOCK(oldso); 2059 source = *SLOT(oldsolabel); 2060 SOCK_UNLOCK(oldso); 2061 2062 dest = SLOT(newsolabel); 2063 2064 SOCK_LOCK(newso); 2065 lomac_copy_single(&source, dest); 2066 SOCK_UNLOCK(newso); 2067 } 2068 2069 static void 2070 lomac_socket_relabel(struct ucred *cred, struct socket *so, 2071 struct label *solabel, struct label *newlabel) 2072 { 2073 struct mac_lomac *source, *dest; 2074 2075 SOCK_LOCK_ASSERT(so); 2076 2077 source = SLOT(newlabel); 2078 dest = SLOT(solabel); 2079 2080 try_relabel(source, dest); 2081 } 2082 2083 static void 2084 lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 2085 struct socket *so, struct label *sopeerlabel) 2086 { 2087 struct mac_lomac *source, *dest; 2088 2089 source = SLOT(mlabel); 2090 dest = SLOT(sopeerlabel); 2091 2092 SOCK_LOCK(so); 2093 lomac_copy_single(source, dest); 2094 SOCK_UNLOCK(so); 2095 } 2096 2097 static void 2098 lomac_socketpeer_set_from_socket(struct socket *oldso, 2099 struct label *oldsolabel, struct socket *newso, 2100 struct label *newsopeerlabel) 2101 { 2102 struct mac_lomac source, *dest; 2103 2104 SOCK_LOCK(oldso); 2105 source = *SLOT(oldsolabel); 2106 SOCK_UNLOCK(oldso); 2107 2108 dest = SLOT(newsopeerlabel); 2109 2110 SOCK_LOCK(newso); 2111 lomac_copy_single(&source, dest); 2112 SOCK_UNLOCK(newso); 2113 } 2114 2115 static void 2116 lomac_syncache_create(struct label *label, struct inpcb *inp) 2117 { 2118 struct mac_lomac *source, *dest; 2119 2120 source = SLOT(inp->inp_label); 2121 dest = SLOT(label); 2122 lomac_copy(source, dest); 2123 } 2124 2125 static void 2126 lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2127 struct label *mlabel) 2128 { 2129 struct mac_lomac *source, *dest; 2130 2131 source = SLOT(sc_label); 2132 dest = SLOT(mlabel); 2133 lomac_copy(source, dest); 2134 } 2135 2136 static int 2137 lomac_system_check_acct(struct ucred *cred, struct vnode *vp, 2138 struct label *vplabel) 2139 { 2140 struct mac_lomac *subj, *obj; 2141 2142 if (!lomac_enabled) 2143 return (0); 2144 2145 subj = SLOT(cred->cr_label); 2146 obj = SLOT(vplabel); 2147 2148 if (lomac_subject_privileged(subj)) 2149 return (EPERM); 2150 2151 if (!lomac_high_single(obj)) 2152 return (EACCES); 2153 2154 return (0); 2155 } 2156 2157 static int 2158 lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2159 struct label *vplabel) 2160 { 2161 struct mac_lomac *subj, *obj; 2162 2163 if (!lomac_enabled) 2164 return (0); 2165 2166 subj = SLOT(cred->cr_label); 2167 obj = SLOT(vplabel); 2168 2169 if (lomac_subject_privileged(subj)) 2170 return (EPERM); 2171 2172 if (!lomac_high_single(obj)) 2173 return (EACCES); 2174 2175 return (0); 2176 } 2177 2178 static int 2179 lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2180 struct label *vplabel) 2181 { 2182 struct mac_lomac *subj; 2183 2184 if (!lomac_enabled) 2185 return (0); 2186 2187 subj = SLOT(cred->cr_label); 2188 2189 if (lomac_subject_privileged(subj)) 2190 return (EPERM); 2191 2192 return (0); 2193 } 2194 2195 static int 2196 lomac_system_check_swapon(struct ucred *cred, struct vnode *vp, 2197 struct label *vplabel) 2198 { 2199 struct mac_lomac *subj, *obj; 2200 2201 if (!lomac_enabled) 2202 return (0); 2203 2204 subj = SLOT(cred->cr_label); 2205 obj = SLOT(vplabel); 2206 2207 if (lomac_subject_privileged(subj)) 2208 return (EPERM); 2209 2210 if (!lomac_high_single(obj)) 2211 return (EACCES); 2212 2213 return (0); 2214 } 2215 2216 static int 2217 lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2218 void *arg1, int arg2, struct sysctl_req *req) 2219 { 2220 struct mac_lomac *subj; 2221 2222 if (!lomac_enabled) 2223 return (0); 2224 2225 subj = SLOT(cred->cr_label); 2226 2227 /* 2228 * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high, 2229 * but also require privilege to change them. 2230 */ 2231 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2232 #ifdef notdef 2233 if (!lomac_subject_dominate_high(subj)) 2234 return (EACCES); 2235 #endif 2236 2237 if (lomac_subject_privileged(subj)) 2238 return (EPERM); 2239 } 2240 2241 return (0); 2242 } 2243 2244 static void 2245 lomac_thread_userret(struct thread *td) 2246 { 2247 struct proc *p = td->td_proc; 2248 struct mac_lomac_proc *subj = PSLOT(p->p_label); 2249 struct ucred *newcred, *oldcred; 2250 int dodrop; 2251 2252 mtx_lock(&subj->mtx); 2253 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) { 2254 dodrop = 0; 2255 mtx_unlock(&subj->mtx); 2256 newcred = crget(); 2257 /* 2258 * Prevent a lock order reversal in mac_proc_vm_revoke; 2259 * ideally, the other user of subj->mtx wouldn't be holding 2260 * Giant. 2261 */ 2262 mtx_lock(&Giant); 2263 PROC_LOCK(p); 2264 mtx_lock(&subj->mtx); 2265 /* 2266 * Check if we lost the race while allocating the cred. 2267 */ 2268 if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) { 2269 crfree(newcred); 2270 goto out; 2271 } 2272 oldcred = p->p_ucred; 2273 crcopy(newcred, oldcred); 2274 crhold(newcred); 2275 lomac_copy(&subj->mac_lomac, SLOT(newcred->cr_label)); 2276 p->p_ucred = newcred; 2277 crfree(oldcred); 2278 dodrop = 1; 2279 out: 2280 mtx_unlock(&subj->mtx); 2281 PROC_UNLOCK(p); 2282 if (dodrop) 2283 mac_proc_vm_revoke(curthread); 2284 mtx_unlock(&Giant); 2285 } else { 2286 mtx_unlock(&subj->mtx); 2287 } 2288 } 2289 2290 static int 2291 lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2292 struct vnode *vp, struct label *vplabel) 2293 { 2294 struct mac_lomac ml_temp, *source, *dest; 2295 int buflen, error; 2296 2297 source = SLOT(mplabel); 2298 dest = SLOT(vplabel); 2299 2300 buflen = sizeof(ml_temp); 2301 bzero(&ml_temp, buflen); 2302 2303 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2304 MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread); 2305 if (error == ENOATTR || error == EOPNOTSUPP) { 2306 /* Fall back to the mntlabel. */ 2307 lomac_copy_single(source, dest); 2308 return (0); 2309 } else if (error) 2310 return (error); 2311 2312 if (buflen != sizeof(ml_temp)) { 2313 if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) { 2314 printf("lomac_vnode_associate_extattr: bad size %d\n", 2315 buflen); 2316 return (EPERM); 2317 } 2318 bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle)); 2319 buflen = sizeof(ml_temp); 2320 (void)vn_extattr_set(vp, IO_NODELOCKED, 2321 MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME, 2322 buflen, (char *)&ml_temp, curthread); 2323 } 2324 if (lomac_valid(&ml_temp) != 0) { 2325 printf("lomac_vnode_associate_extattr: invalid\n"); 2326 return (EPERM); 2327 } 2328 if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) != 2329 MAC_LOMAC_FLAG_SINGLE) { 2330 printf("lomac_vnode_associate_extattr: not single\n"); 2331 return (EPERM); 2332 } 2333 2334 lomac_copy_single(&ml_temp, dest); 2335 return (0); 2336 } 2337 2338 static void 2339 lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2340 struct vnode *vp, struct label *vplabel) 2341 { 2342 struct mac_lomac *source, *dest; 2343 2344 source = SLOT(mplabel); 2345 dest = SLOT(vplabel); 2346 2347 lomac_copy_single(source, dest); 2348 } 2349 2350 static int 2351 lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2352 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2353 { 2354 struct mac_lomac *subj, *obj; 2355 2356 if (!lomac_enabled) 2357 return (0); 2358 2359 subj = SLOT(cred->cr_label); 2360 obj = SLOT(dvplabel); 2361 2362 if (!lomac_subject_dominate(subj, obj)) 2363 return (EACCES); 2364 if (obj->ml_flags & MAC_LOMAC_FLAG_AUX && 2365 !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle)) 2366 return (EACCES); 2367 2368 return (0); 2369 } 2370 2371 static int 2372 lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2373 struct label *vplabel, acl_type_t type) 2374 { 2375 struct mac_lomac *subj, *obj; 2376 2377 if (!lomac_enabled) 2378 return (0); 2379 2380 subj = SLOT(cred->cr_label); 2381 obj = SLOT(vplabel); 2382 2383 if (!lomac_subject_dominate(subj, obj)) 2384 return (EACCES); 2385 2386 return (0); 2387 } 2388 2389 static int 2390 lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2391 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2392 struct componentname *cnp) 2393 { 2394 struct mac_lomac *subj, *obj; 2395 2396 if (!lomac_enabled) 2397 return (0); 2398 2399 subj = SLOT(cred->cr_label); 2400 obj = SLOT(dvplabel); 2401 2402 if (!lomac_subject_dominate(subj, obj)) 2403 return (EACCES); 2404 2405 obj = SLOT(vplabel); 2406 2407 if (!lomac_subject_dominate(subj, obj)) 2408 return (EACCES); 2409 2410 return (0); 2411 } 2412 2413 static int 2414 lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2415 struct label *vplabel, int prot, int flags) 2416 { 2417 struct mac_lomac *subj, *obj; 2418 2419 /* 2420 * Rely on the use of open()-time protections to handle 2421 * non-revocation cases. 2422 */ 2423 if (!lomac_enabled) 2424 return (0); 2425 2426 subj = SLOT(cred->cr_label); 2427 obj = SLOT(vplabel); 2428 2429 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2430 if (!lomac_subject_dominate(subj, obj)) 2431 return (EACCES); 2432 } 2433 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2434 if (!lomac_dominate_single(obj, subj)) 2435 return (maybe_demote(subj, obj, "mapping", "file", vp)); 2436 } 2437 2438 return (0); 2439 } 2440 2441 static void 2442 lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp, 2443 struct label *vplabel, /* XXX vm_prot_t */ int *prot) 2444 { 2445 struct mac_lomac *subj, *obj; 2446 2447 /* 2448 * Rely on the use of open()-time protections to handle 2449 * non-revocation cases. 2450 */ 2451 if (!lomac_enabled || !revocation_enabled) 2452 return; 2453 2454 subj = SLOT(cred->cr_label); 2455 obj = SLOT(vplabel); 2456 2457 if (!lomac_subject_dominate(subj, obj)) 2458 *prot &= ~VM_PROT_WRITE; 2459 } 2460 2461 static int 2462 lomac_vnode_check_open(struct ucred *cred, struct vnode *vp, 2463 struct label *vplabel, accmode_t accmode) 2464 { 2465 struct mac_lomac *subj, *obj; 2466 2467 if (!lomac_enabled) 2468 return (0); 2469 2470 subj = SLOT(cred->cr_label); 2471 obj = SLOT(vplabel); 2472 2473 /* XXX privilege override for admin? */ 2474 if (accmode & VMODIFY_PERMS) { 2475 if (!lomac_subject_dominate(subj, obj)) 2476 return (EACCES); 2477 } 2478 2479 return (0); 2480 } 2481 2482 static int 2483 lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2484 struct vnode *vp, struct label *vplabel) 2485 { 2486 struct mac_lomac *subj, *obj; 2487 2488 if (!lomac_enabled || !revocation_enabled) 2489 return (0); 2490 2491 subj = SLOT(active_cred->cr_label); 2492 obj = SLOT(vplabel); 2493 2494 if (!lomac_dominate_single(obj, subj)) 2495 return (maybe_demote(subj, obj, "reading", "file", vp)); 2496 2497 return (0); 2498 } 2499 2500 static int 2501 lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2502 struct label *vplabel, struct label *newlabel) 2503 { 2504 struct mac_lomac *old, *new, *subj; 2505 int error; 2506 2507 old = SLOT(vplabel); 2508 new = SLOT(newlabel); 2509 subj = SLOT(cred->cr_label); 2510 2511 /* 2512 * If there is a LOMAC label update for the vnode, it must be a 2513 * single label, with an optional explicit auxiliary single. 2514 */ 2515 error = lomac_atmostflags(new, 2516 MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX); 2517 if (error) 2518 return (error); 2519 2520 /* 2521 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must 2522 * authorize the relabel. 2523 */ 2524 if (!lomac_single_in_range(old, subj)) 2525 return (EPERM); 2526 2527 /* 2528 * If the LOMAC label is to be changed, authorize as appropriate. 2529 */ 2530 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 2531 /* 2532 * To change the LOMAC label on a vnode, the new vnode label 2533 * must be in the subject range. 2534 */ 2535 if (!lomac_single_in_range(new, subj)) 2536 return (EPERM); 2537 2538 /* 2539 * To change the LOMAC label on the vnode to be EQUAL, the 2540 * subject must have appropriate privilege. 2541 */ 2542 if (lomac_contains_equal(new)) { 2543 error = lomac_subject_privileged(subj); 2544 if (error) 2545 return (error); 2546 } 2547 } 2548 if (new->ml_flags & MAC_LOMAC_FLAG_AUX) { 2549 /* 2550 * Fill in the missing parts from the previous label. 2551 */ 2552 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 2553 lomac_copy_single(subj, new); 2554 2555 /* 2556 * To change the auxiliary LOMAC label on a vnode, the new 2557 * vnode label must be in the subject range. 2558 */ 2559 if (!lomac_auxsingle_in_range(new, subj)) 2560 return (EPERM); 2561 2562 /* 2563 * To change the auxiliary LOMAC label on the vnode to be 2564 * EQUAL, the subject must have appropriate privilege. 2565 */ 2566 if (lomac_contains_equal(new)) { 2567 error = lomac_subject_privileged(subj); 2568 if (error) 2569 return (error); 2570 } 2571 } 2572 2573 return (0); 2574 } 2575 2576 static int 2577 lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 2578 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2579 struct componentname *cnp) 2580 { 2581 struct mac_lomac *subj, *obj; 2582 2583 if (!lomac_enabled) 2584 return (0); 2585 2586 subj = SLOT(cred->cr_label); 2587 obj = SLOT(dvplabel); 2588 2589 if (!lomac_subject_dominate(subj, obj)) 2590 return (EACCES); 2591 2592 obj = SLOT(vplabel); 2593 2594 if (!lomac_subject_dominate(subj, obj)) 2595 return (EACCES); 2596 2597 return (0); 2598 } 2599 2600 static int 2601 lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 2602 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2603 int samedir, struct componentname *cnp) 2604 { 2605 struct mac_lomac *subj, *obj; 2606 2607 if (!lomac_enabled) 2608 return (0); 2609 2610 subj = SLOT(cred->cr_label); 2611 obj = SLOT(dvplabel); 2612 2613 if (!lomac_subject_dominate(subj, obj)) 2614 return (EACCES); 2615 2616 if (vp != NULL) { 2617 obj = SLOT(vplabel); 2618 2619 if (!lomac_subject_dominate(subj, obj)) 2620 return (EACCES); 2621 } 2622 2623 return (0); 2624 } 2625 2626 static int 2627 lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 2628 struct label *vplabel) 2629 { 2630 struct mac_lomac *subj, *obj; 2631 2632 if (!lomac_enabled) 2633 return (0); 2634 2635 subj = SLOT(cred->cr_label); 2636 obj = SLOT(vplabel); 2637 2638 if (!lomac_subject_dominate(subj, obj)) 2639 return (EACCES); 2640 2641 return (0); 2642 } 2643 2644 static int 2645 lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 2646 struct label *vplabel, acl_type_t type, struct acl *acl) 2647 { 2648 struct mac_lomac *subj, *obj; 2649 2650 if (!lomac_enabled) 2651 return (0); 2652 2653 subj = SLOT(cred->cr_label); 2654 obj = SLOT(vplabel); 2655 2656 if (!lomac_subject_dominate(subj, obj)) 2657 return (EACCES); 2658 2659 return (0); 2660 } 2661 2662 static int 2663 lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 2664 struct label *vplabel, int attrnamespace, const char *name) 2665 { 2666 struct mac_lomac *subj, *obj; 2667 2668 if (!lomac_enabled) 2669 return (0); 2670 2671 subj = SLOT(cred->cr_label); 2672 obj = SLOT(vplabel); 2673 2674 if (!lomac_subject_dominate(subj, obj)) 2675 return (EACCES); 2676 2677 /* XXX: protect the MAC EA in a special way? */ 2678 2679 return (0); 2680 } 2681 2682 static int 2683 lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 2684 struct label *vplabel, u_long flags) 2685 { 2686 struct mac_lomac *subj, *obj; 2687 2688 if (!lomac_enabled) 2689 return (0); 2690 2691 subj = SLOT(cred->cr_label); 2692 obj = SLOT(vplabel); 2693 2694 if (!lomac_subject_dominate(subj, obj)) 2695 return (EACCES); 2696 2697 return (0); 2698 } 2699 2700 static int 2701 lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 2702 struct label *vplabel, mode_t mode) 2703 { 2704 struct mac_lomac *subj, *obj; 2705 2706 if (!lomac_enabled) 2707 return (0); 2708 2709 subj = SLOT(cred->cr_label); 2710 obj = SLOT(vplabel); 2711 2712 if (!lomac_subject_dominate(subj, obj)) 2713 return (EACCES); 2714 2715 return (0); 2716 } 2717 2718 static int 2719 lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 2720 struct label *vplabel, uid_t uid, gid_t gid) 2721 { 2722 struct mac_lomac *subj, *obj; 2723 2724 if (!lomac_enabled) 2725 return (0); 2726 2727 subj = SLOT(cred->cr_label); 2728 obj = SLOT(vplabel); 2729 2730 if (!lomac_subject_dominate(subj, obj)) 2731 return (EACCES); 2732 2733 return (0); 2734 } 2735 2736 static int 2737 lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 2738 struct label *vplabel, struct timespec atime, struct timespec mtime) 2739 { 2740 struct mac_lomac *subj, *obj; 2741 2742 if (!lomac_enabled) 2743 return (0); 2744 2745 subj = SLOT(cred->cr_label); 2746 obj = SLOT(vplabel); 2747 2748 if (!lomac_subject_dominate(subj, obj)) 2749 return (EACCES); 2750 2751 return (0); 2752 } 2753 2754 static int 2755 lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 2756 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2757 struct componentname *cnp) 2758 { 2759 struct mac_lomac *subj, *obj; 2760 2761 if (!lomac_enabled) 2762 return (0); 2763 2764 subj = SLOT(cred->cr_label); 2765 obj = SLOT(dvplabel); 2766 2767 if (!lomac_subject_dominate(subj, obj)) 2768 return (EACCES); 2769 2770 obj = SLOT(vplabel); 2771 2772 if (!lomac_subject_dominate(subj, obj)) 2773 return (EACCES); 2774 2775 return (0); 2776 } 2777 2778 static int 2779 lomac_vnode_check_write(struct ucred *active_cred, 2780 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 2781 { 2782 struct mac_lomac *subj, *obj; 2783 2784 if (!lomac_enabled || !revocation_enabled) 2785 return (0); 2786 2787 subj = SLOT(active_cred->cr_label); 2788 obj = SLOT(vplabel); 2789 2790 if (!lomac_subject_dominate(subj, obj)) 2791 return (EACCES); 2792 2793 return (0); 2794 } 2795 2796 static int 2797 lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp, 2798 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 2799 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 2800 { 2801 struct mac_lomac *source, *dest, *dir, temp; 2802 size_t buflen; 2803 int error; 2804 2805 buflen = sizeof(temp); 2806 bzero(&temp, buflen); 2807 2808 source = SLOT(cred->cr_label); 2809 dest = SLOT(vplabel); 2810 dir = SLOT(dvplabel); 2811 if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) { 2812 lomac_copy_auxsingle(dir, &temp); 2813 lomac_set_single(&temp, dir->ml_auxsingle.mle_type, 2814 dir->ml_auxsingle.mle_grade); 2815 } else { 2816 lomac_copy_single(source, &temp); 2817 } 2818 2819 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2820 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); 2821 if (error == 0) 2822 lomac_copy(&temp, dest); 2823 return (error); 2824 } 2825 2826 static void 2827 lomac_vnode_execve_transition(struct ucred *old, struct ucred *new, 2828 struct vnode *vp, struct label *vplabel, struct label *interpvplabel, 2829 struct image_params *imgp, struct label *execlabel) 2830 { 2831 struct mac_lomac *source, *dest, *obj, *robj; 2832 2833 source = SLOT(old->cr_label); 2834 dest = SLOT(new->cr_label); 2835 obj = SLOT(vplabel); 2836 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; 2837 2838 lomac_copy(source, dest); 2839 /* 2840 * If there's an auxiliary label on the real object, respect it and 2841 * assume that this level should be assumed immediately if a higher 2842 * level is currently in place. 2843 */ 2844 if (robj->ml_flags & MAC_LOMAC_FLAG_AUX && 2845 !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single) 2846 && lomac_auxsingle_in_range(robj, dest)) 2847 lomac_set_single(dest, robj->ml_auxsingle.mle_type, 2848 robj->ml_auxsingle.mle_grade); 2849 /* 2850 * Restructuring to use the execve transitioning mechanism instead of 2851 * the normal demotion mechanism here would be difficult, so just 2852 * copy the label over and perform standard demotion. This is also 2853 * non-optimal because it will result in the intermediate label "new" 2854 * being created and immediately recycled. 2855 */ 2856 if (lomac_enabled && revocation_enabled && 2857 !lomac_dominate_single(obj, source)) 2858 (void)maybe_demote(source, obj, "executing", "file", vp); 2859 } 2860 2861 static int 2862 lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp, 2863 struct label *vplabel, struct label *interpvplabel, 2864 struct image_params *imgp, struct label *execlabel) 2865 { 2866 struct mac_lomac *subj, *obj, *robj; 2867 2868 if (!lomac_enabled || !revocation_enabled) 2869 return (0); 2870 2871 subj = SLOT(old->cr_label); 2872 obj = SLOT(vplabel); 2873 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; 2874 2875 return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX && 2876 !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single) 2877 && lomac_auxsingle_in_range(robj, subj)) || 2878 !lomac_dominate_single(obj, subj)); 2879 } 2880 2881 static void 2882 lomac_vnode_relabel(struct ucred *cred, struct vnode *vp, 2883 struct label *vplabel, struct label *newlabel) 2884 { 2885 struct mac_lomac *source, *dest; 2886 2887 source = SLOT(newlabel); 2888 dest = SLOT(vplabel); 2889 2890 try_relabel(source, dest); 2891 } 2892 2893 static int 2894 lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 2895 struct label *vplabel, struct label *intlabel) 2896 { 2897 struct mac_lomac *source, temp; 2898 size_t buflen; 2899 int error; 2900 2901 buflen = sizeof(temp); 2902 bzero(&temp, buflen); 2903 2904 source = SLOT(intlabel); 2905 if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 2906 return (0); 2907 2908 lomac_copy_single(source, &temp); 2909 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2910 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); 2911 return (error); 2912 } 2913 2914 static struct mac_policy_ops lomac_ops = 2915 { 2916 .mpo_init = lomac_init, 2917 2918 .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive, 2919 .mpo_bpfdesc_create = lomac_bpfdesc_create, 2920 .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf, 2921 .mpo_bpfdesc_destroy_label = lomac_destroy_label, 2922 .mpo_bpfdesc_init_label = lomac_init_label, 2923 2924 .mpo_cred_check_relabel = lomac_cred_check_relabel, 2925 .mpo_cred_check_visible = lomac_cred_check_visible, 2926 .mpo_cred_copy_label = lomac_copy_label, 2927 .mpo_cred_create_swapper = lomac_cred_create_swapper, 2928 .mpo_cred_create_init = lomac_cred_create_init, 2929 .mpo_cred_destroy_label = lomac_destroy_label, 2930 .mpo_cred_externalize_label = lomac_externalize_label, 2931 .mpo_cred_init_label = lomac_init_label, 2932 .mpo_cred_internalize_label = lomac_internalize_label, 2933 .mpo_cred_relabel = lomac_cred_relabel, 2934 2935 .mpo_devfs_create_device = lomac_devfs_create_device, 2936 .mpo_devfs_create_directory = lomac_devfs_create_directory, 2937 .mpo_devfs_create_symlink = lomac_devfs_create_symlink, 2938 .mpo_devfs_destroy_label = lomac_destroy_label, 2939 .mpo_devfs_init_label = lomac_init_label, 2940 .mpo_devfs_update = lomac_devfs_update, 2941 .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate, 2942 2943 .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel, 2944 .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit, 2945 .mpo_ifnet_copy_label = lomac_copy_label, 2946 .mpo_ifnet_create = lomac_ifnet_create, 2947 .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf, 2948 .mpo_ifnet_destroy_label = lomac_destroy_label, 2949 .mpo_ifnet_externalize_label = lomac_externalize_label, 2950 .mpo_ifnet_init_label = lomac_init_label, 2951 .mpo_ifnet_internalize_label = lomac_internalize_label, 2952 .mpo_ifnet_relabel = lomac_ifnet_relabel, 2953 2954 .mpo_syncache_create = lomac_syncache_create, 2955 .mpo_syncache_destroy_label = lomac_destroy_label, 2956 .mpo_syncache_init_label = lomac_init_label_waitcheck, 2957 2958 .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver, 2959 .mpo_inpcb_check_visible = lomac_inpcb_check_visible, 2960 .mpo_inpcb_create = lomac_inpcb_create, 2961 .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf, 2962 .mpo_inpcb_destroy_label = lomac_destroy_label, 2963 .mpo_inpcb_init_label = lomac_init_label_waitcheck, 2964 .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel, 2965 2966 .mpo_ip6q_create = lomac_ip6q_create, 2967 .mpo_ip6q_destroy_label = lomac_destroy_label, 2968 .mpo_ip6q_init_label = lomac_init_label_waitcheck, 2969 .mpo_ip6q_match = lomac_ip6q_match, 2970 .mpo_ip6q_reassemble = lomac_ip6q_reassemble, 2971 .mpo_ip6q_update = lomac_ip6q_update, 2972 2973 .mpo_ipq_create = lomac_ipq_create, 2974 .mpo_ipq_destroy_label = lomac_destroy_label, 2975 .mpo_ipq_init_label = lomac_init_label_waitcheck, 2976 .mpo_ipq_match = lomac_ipq_match, 2977 .mpo_ipq_reassemble = lomac_ipq_reassemble, 2978 .mpo_ipq_update = lomac_ipq_update, 2979 2980 .mpo_kld_check_load = lomac_kld_check_load, 2981 2982 .mpo_mbuf_copy_label = lomac_copy_label, 2983 .mpo_mbuf_destroy_label = lomac_destroy_label, 2984 .mpo_mbuf_init_label = lomac_init_label_waitcheck, 2985 2986 .mpo_mount_create = lomac_mount_create, 2987 .mpo_mount_destroy_label = lomac_destroy_label, 2988 .mpo_mount_init_label = lomac_init_label, 2989 2990 .mpo_netatalk_aarp_send = lomac_netatalk_aarp_send, 2991 2992 .mpo_netinet_arp_send = lomac_netinet_arp_send, 2993 .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply, 2994 .mpo_netinet_firewall_send = lomac_netinet_firewall_send, 2995 .mpo_netinet_fragment = lomac_netinet_fragment, 2996 .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply, 2997 .mpo_netinet_igmp_send = lomac_netinet_igmp_send, 2998 2999 .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send, 3000 3001 .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl, 3002 .mpo_pipe_check_read = lomac_pipe_check_read, 3003 .mpo_pipe_check_relabel = lomac_pipe_check_relabel, 3004 .mpo_pipe_check_write = lomac_pipe_check_write, 3005 .mpo_pipe_copy_label = lomac_copy_label, 3006 .mpo_pipe_create = lomac_pipe_create, 3007 .mpo_pipe_destroy_label = lomac_destroy_label, 3008 .mpo_pipe_externalize_label = lomac_externalize_label, 3009 .mpo_pipe_init_label = lomac_init_label, 3010 .mpo_pipe_internalize_label = lomac_internalize_label, 3011 .mpo_pipe_relabel = lomac_pipe_relabel, 3012 3013 .mpo_priv_check = lomac_priv_check, 3014 3015 .mpo_proc_check_debug = lomac_proc_check_debug, 3016 .mpo_proc_check_sched = lomac_proc_check_sched, 3017 .mpo_proc_check_signal = lomac_proc_check_signal, 3018 .mpo_proc_destroy_label = lomac_proc_destroy_label, 3019 .mpo_proc_init_label = lomac_proc_init_label, 3020 3021 .mpo_socket_check_deliver = lomac_socket_check_deliver, 3022 .mpo_socket_check_relabel = lomac_socket_check_relabel, 3023 .mpo_socket_check_visible = lomac_socket_check_visible, 3024 .mpo_socket_copy_label = lomac_copy_label, 3025 .mpo_socket_create = lomac_socket_create, 3026 .mpo_socket_create_mbuf = lomac_socket_create_mbuf, 3027 .mpo_socket_destroy_label = lomac_destroy_label, 3028 .mpo_socket_externalize_label = lomac_externalize_label, 3029 .mpo_socket_init_label = lomac_init_label_waitcheck, 3030 .mpo_socket_internalize_label = lomac_internalize_label, 3031 .mpo_socket_newconn = lomac_socket_newconn, 3032 .mpo_socket_relabel = lomac_socket_relabel, 3033 3034 .mpo_socketpeer_destroy_label = lomac_destroy_label, 3035 .mpo_socketpeer_externalize_label = lomac_externalize_label, 3036 .mpo_socketpeer_init_label = lomac_init_label_waitcheck, 3037 .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf, 3038 .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket, 3039 3040 .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf, 3041 3042 .mpo_system_check_acct = lomac_system_check_acct, 3043 .mpo_system_check_auditctl = lomac_system_check_auditctl, 3044 .mpo_system_check_swapoff = lomac_system_check_swapoff, 3045 .mpo_system_check_swapon = lomac_system_check_swapon, 3046 .mpo_system_check_sysctl = lomac_system_check_sysctl, 3047 3048 .mpo_thread_userret = lomac_thread_userret, 3049 3050 .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr, 3051 .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel, 3052 .mpo_vnode_check_access = lomac_vnode_check_open, 3053 .mpo_vnode_check_create = lomac_vnode_check_create, 3054 .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl, 3055 .mpo_vnode_check_link = lomac_vnode_check_link, 3056 .mpo_vnode_check_mmap = lomac_vnode_check_mmap, 3057 .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade, 3058 .mpo_vnode_check_open = lomac_vnode_check_open, 3059 .mpo_vnode_check_read = lomac_vnode_check_read, 3060 .mpo_vnode_check_relabel = lomac_vnode_check_relabel, 3061 .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from, 3062 .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to, 3063 .mpo_vnode_check_revoke = lomac_vnode_check_revoke, 3064 .mpo_vnode_check_setacl = lomac_vnode_check_setacl, 3065 .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr, 3066 .mpo_vnode_check_setflags = lomac_vnode_check_setflags, 3067 .mpo_vnode_check_setmode = lomac_vnode_check_setmode, 3068 .mpo_vnode_check_setowner = lomac_vnode_check_setowner, 3069 .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes, 3070 .mpo_vnode_check_unlink = lomac_vnode_check_unlink, 3071 .mpo_vnode_check_write = lomac_vnode_check_write, 3072 .mpo_vnode_copy_label = lomac_copy_label, 3073 .mpo_vnode_create_extattr = lomac_vnode_create_extattr, 3074 .mpo_vnode_destroy_label = lomac_destroy_label, 3075 .mpo_vnode_execve_transition = lomac_vnode_execve_transition, 3076 .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition, 3077 .mpo_vnode_externalize_label = lomac_externalize_label, 3078 .mpo_vnode_init_label = lomac_init_label, 3079 .mpo_vnode_internalize_label = lomac_internalize_label, 3080 .mpo_vnode_relabel = lomac_vnode_relabel, 3081 .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr, 3082 }; 3083 3084 MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC", 3085 MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot);

Cache object: a4c4d8b9daffc93b6c246175eeaf26a4

FreeBSD/Linux Kernel Cross Reference sys/security/mac_lomac/mac_lomac.c

FreeBSD/Linux Kernel Cross Reference
sys/security/mac_lomac/mac_lomac.c