fxr.watson.org: l41 sys/security/mac_lomac/mac

FreeBSD/Linux Kernel Cross Reference
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 static SYSCTL_NODE(_security_mac, OID_AUTO, lomac, 97 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 98 "TrustedBSD mac_lomac policy controls"); 99 100 static int lomac_label_size = sizeof(struct mac_lomac); 101 SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD, 102 &lomac_label_size, 0, "Size of struct mac_lomac"); 103 104 static int lomac_enabled = 1; 105 SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RWTUN, 106 &lomac_enabled, 0, "Enforce MAC/LOMAC policy"); 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_RDTUN, 114 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC"); 115 116 static char trusted_interfaces[128]; 117 SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RDTUN, 118 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC"); 119 120 static int ptys_equal = 0; 121 SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RWTUN, 122 &ptys_equal, 0, "Label pty devices as lomac/equal on create"); 123 124 static int revocation_enabled = 1; 125 SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN, 126 &revocation_enabled, 0, "Revoke access to objects on relabel"); 127 128 static int lomac_slot; 129 #define SLOT(l) ((struct mac_lomac *)mac_label_get((l), lomac_slot)) 130 #define SLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val)) 131 #define PSLOT(l) ((struct mac_lomac_proc *) \ 132 mac_label_get((l), lomac_slot)) 133 #define PSLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val)) 134 135 static MALLOC_DEFINE(M_LOMAC, "mac_lomac_label", "MAC/LOMAC labels"); 136 137 static struct mac_lomac * 138 lomac_alloc(int flag) 139 { 140 struct mac_lomac *ml; 141 142 ml = malloc(sizeof(*ml), M_LOMAC, M_ZERO | flag); 143 144 return (ml); 145 } 146 147 static void 148 lomac_free(struct mac_lomac *ml) 149 { 150 151 if (ml != NULL) 152 free(ml, M_LOMAC); 153 else 154 atomic_add_int(&destroyed_not_inited, 1); 155 } 156 157 static int 158 lomac_atmostflags(struct mac_lomac *ml, int flags) 159 { 160 161 if ((ml->ml_flags & flags) != ml->ml_flags) 162 return (EINVAL); 163 return (0); 164 } 165 166 static int 167 lomac_dominate_element(struct mac_lomac_element *a, 168 struct mac_lomac_element *b) 169 { 170 171 switch (a->mle_type) { 172 case MAC_LOMAC_TYPE_EQUAL: 173 case MAC_LOMAC_TYPE_HIGH: 174 return (1); 175 176 case MAC_LOMAC_TYPE_LOW: 177 switch (b->mle_type) { 178 case MAC_LOMAC_TYPE_GRADE: 179 case MAC_LOMAC_TYPE_HIGH: 180 return (0); 181 182 case MAC_LOMAC_TYPE_EQUAL: 183 case MAC_LOMAC_TYPE_LOW: 184 return (1); 185 186 default: 187 panic("lomac_dominate_element: b->mle_type invalid"); 188 } 189 190 case MAC_LOMAC_TYPE_GRADE: 191 switch (b->mle_type) { 192 case MAC_LOMAC_TYPE_EQUAL: 193 case MAC_LOMAC_TYPE_LOW: 194 return (1); 195 196 case MAC_LOMAC_TYPE_HIGH: 197 return (0); 198 199 case MAC_LOMAC_TYPE_GRADE: 200 return (a->mle_grade >= b->mle_grade); 201 202 default: 203 panic("lomac_dominate_element: b->mle_type invalid"); 204 } 205 206 default: 207 panic("lomac_dominate_element: a->mle_type invalid"); 208 } 209 } 210 211 static int 212 lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb) 213 { 214 215 return (lomac_dominate_element(&rangeb->ml_rangehigh, 216 &rangea->ml_rangehigh) && 217 lomac_dominate_element(&rangea->ml_rangelow, 218 &rangeb->ml_rangelow)); 219 } 220 221 static int 222 lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range) 223 { 224 225 KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 226 ("lomac_single_in_range: a not single")); 227 KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, 228 ("lomac_single_in_range: b not range")); 229 230 return (lomac_dominate_element(&range->ml_rangehigh, 231 &single->ml_single) && lomac_dominate_element(&single->ml_single, 232 &range->ml_rangelow)); 233 } 234 235 static int 236 lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range) 237 { 238 239 KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0, 240 ("lomac_single_in_range: a not auxsingle")); 241 KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, 242 ("lomac_single_in_range: b not range")); 243 244 return (lomac_dominate_element(&range->ml_rangehigh, 245 &single->ml_auxsingle) && 246 lomac_dominate_element(&single->ml_auxsingle, 247 &range->ml_rangelow)); 248 } 249 250 static int 251 lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b) 252 { 253 KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 254 ("lomac_dominate_single: a not single")); 255 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 256 ("lomac_dominate_single: b not single")); 257 258 return (lomac_dominate_element(&a->ml_single, &b->ml_single)); 259 } 260 261 static int 262 lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b) 263 { 264 KASSERT((~a->ml_flags & 265 (MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0, 266 ("lomac_dominate_single: a not subject")); 267 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 268 ("lomac_dominate_single: b not single")); 269 270 return (lomac_dominate_element(&a->ml_rangehigh, &b->ml_single)); 271 } 272 273 static int 274 lomac_equal_element(struct mac_lomac_element *a, struct mac_lomac_element *b) 275 { 276 277 if (a->mle_type == MAC_LOMAC_TYPE_EQUAL || 278 b->mle_type == MAC_LOMAC_TYPE_EQUAL) 279 return (1); 280 281 return (a->mle_type == b->mle_type && a->mle_grade == b->mle_grade); 282 } 283 284 static int 285 lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b) 286 { 287 288 KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 289 ("lomac_equal_single: a not single")); 290 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 291 ("lomac_equal_single: b not single")); 292 293 return (lomac_equal_element(&a->ml_single, &b->ml_single)); 294 } 295 296 static int 297 lomac_contains_equal(struct mac_lomac *ml) 298 { 299 300 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) 301 if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL) 302 return (1); 303 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) 304 if (ml->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL) 305 return (1); 306 307 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { 308 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL) 309 return (1); 310 if (ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL) 311 return (1); 312 } 313 314 return (0); 315 } 316 317 static int 318 lomac_subject_privileged(struct mac_lomac *ml) 319 { 320 321 KASSERT((ml->ml_flags & MAC_LOMAC_FLAGS_BOTH) == 322 MAC_LOMAC_FLAGS_BOTH, 323 ("lomac_subject_privileged: subject doesn't have both labels")); 324 325 /* If the single is EQUAL, it's ok. */ 326 if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL) 327 return (0); 328 329 /* If either range endpoint is EQUAL, it's ok. */ 330 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL || 331 ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL) 332 return (0); 333 334 /* If the range is low-high, it's ok. */ 335 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW && 336 ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH) 337 return (0); 338 339 /* It's not ok. */ 340 return (EPERM); 341 } 342 343 static int 344 lomac_high_single(struct mac_lomac *ml) 345 { 346 347 KASSERT((ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 348 ("lomac_high_single: mac_lomac not single")); 349 350 return (ml->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH); 351 } 352 353 static int 354 lomac_valid(struct mac_lomac *ml) 355 { 356 357 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 358 switch (ml->ml_single.mle_type) { 359 case MAC_LOMAC_TYPE_GRADE: 360 case MAC_LOMAC_TYPE_EQUAL: 361 case MAC_LOMAC_TYPE_HIGH: 362 case MAC_LOMAC_TYPE_LOW: 363 break; 364 365 default: 366 return (EINVAL); 367 } 368 } else { 369 if (ml->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF) 370 return (EINVAL); 371 } 372 373 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) { 374 switch (ml->ml_auxsingle.mle_type) { 375 case MAC_LOMAC_TYPE_GRADE: 376 case MAC_LOMAC_TYPE_EQUAL: 377 case MAC_LOMAC_TYPE_HIGH: 378 case MAC_LOMAC_TYPE_LOW: 379 break; 380 381 default: 382 return (EINVAL); 383 } 384 } else { 385 if (ml->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF) 386 return (EINVAL); 387 } 388 389 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { 390 switch (ml->ml_rangelow.mle_type) { 391 case MAC_LOMAC_TYPE_GRADE: 392 case MAC_LOMAC_TYPE_EQUAL: 393 case MAC_LOMAC_TYPE_HIGH: 394 case MAC_LOMAC_TYPE_LOW: 395 break; 396 397 default: 398 return (EINVAL); 399 } 400 401 switch (ml->ml_rangehigh.mle_type) { 402 case MAC_LOMAC_TYPE_GRADE: 403 case MAC_LOMAC_TYPE_EQUAL: 404 case MAC_LOMAC_TYPE_HIGH: 405 case MAC_LOMAC_TYPE_LOW: 406 break; 407 408 default: 409 return (EINVAL); 410 } 411 if (!lomac_dominate_element(&ml->ml_rangehigh, 412 &ml->ml_rangelow)) 413 return (EINVAL); 414 } else { 415 if (ml->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF || 416 ml->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF) 417 return (EINVAL); 418 } 419 420 return (0); 421 } 422 423 static void 424 lomac_set_range(struct mac_lomac *ml, u_short typelow, u_short gradelow, 425 u_short typehigh, u_short gradehigh) 426 { 427 428 ml->ml_rangelow.mle_type = typelow; 429 ml->ml_rangelow.mle_grade = gradelow; 430 ml->ml_rangehigh.mle_type = typehigh; 431 ml->ml_rangehigh.mle_grade = gradehigh; 432 ml->ml_flags |= MAC_LOMAC_FLAG_RANGE; 433 } 434 435 static void 436 lomac_set_single(struct mac_lomac *ml, u_short type, u_short grade) 437 { 438 439 ml->ml_single.mle_type = type; 440 ml->ml_single.mle_grade = grade; 441 ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE; 442 } 443 444 static void 445 lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto) 446 { 447 448 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, 449 ("lomac_copy_range: labelfrom not range")); 450 451 labelto->ml_rangelow = labelfrom->ml_rangelow; 452 labelto->ml_rangehigh = labelfrom->ml_rangehigh; 453 labelto->ml_flags |= MAC_LOMAC_FLAG_RANGE; 454 } 455 456 static void 457 lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto) 458 { 459 460 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, 461 ("lomac_copy_single: labelfrom not single")); 462 463 labelto->ml_single = labelfrom->ml_single; 464 labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE; 465 } 466 467 static void 468 lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto) 469 { 470 471 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0, 472 ("lomac_copy_auxsingle: labelfrom not auxsingle")); 473 474 labelto->ml_auxsingle = labelfrom->ml_auxsingle; 475 labelto->ml_flags |= MAC_LOMAC_FLAG_AUX; 476 } 477 478 static void 479 lomac_copy(struct mac_lomac *source, struct mac_lomac *dest) 480 { 481 482 if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE) 483 lomac_copy_single(source, dest); 484 if (source->ml_flags & MAC_LOMAC_FLAG_AUX) 485 lomac_copy_auxsingle(source, dest); 486 if (source->ml_flags & MAC_LOMAC_FLAG_RANGE) 487 lomac_copy_range(source, dest); 488 } 489 490 static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml); 491 492 static int 493 maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel, 494 const char *actionname, const char *objname, struct vnode *vp) 495 { 496 struct sbuf subjlabel_sb, subjtext_sb, objlabel_sb; 497 char *subjlabeltext, *objlabeltext, *subjtext; 498 struct mac_lomac cached_subjlabel; 499 struct mac_lomac_proc *subj; 500 struct vattr va; 501 struct proc *p; 502 pid_t pgid; 503 504 subj = PSLOT(curthread->td_proc->p_label); 505 506 p = curthread->td_proc; 507 mtx_lock(&subj->mtx); 508 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) { 509 /* 510 * Check to see if the pending demotion would be more or less 511 * severe than this one, and keep the more severe. This can 512 * only happen for a multi-threaded application. 513 */ 514 if (lomac_dominate_single(objlabel, &subj->mac_lomac)) { 515 mtx_unlock(&subj->mtx); 516 return (0); 517 } 518 } 519 bzero(&subj->mac_lomac, sizeof(subj->mac_lomac)); 520 /* 521 * Always demote the single label. 522 */ 523 lomac_copy_single(objlabel, &subj->mac_lomac); 524 /* 525 * Start with the original range, then minimize each side of the 526 * range to the point of not dominating the object. The high side 527 * will always be demoted, of course. 528 */ 529 lomac_copy_range(subjlabel, &subj->mac_lomac); 530 if (!lomac_dominate_element(&objlabel->ml_single, 531 &subj->mac_lomac.ml_rangelow)) 532 subj->mac_lomac.ml_rangelow = objlabel->ml_single; 533 subj->mac_lomac.ml_rangehigh = objlabel->ml_single; 534 subj->mac_lomac.ml_flags |= MAC_LOMAC_FLAG_UPDATE; 535 thread_lock(curthread); 536 curthread->td_flags |= TDF_ASTPENDING | TDF_MACPEND; 537 thread_unlock(curthread); 538 539 /* 540 * Avoid memory allocation while holding a mutex; cache the label. 541 */ 542 lomac_copy_single(&subj->mac_lomac, &cached_subjlabel); 543 mtx_unlock(&subj->mtx); 544 545 sbuf_new(&subjlabel_sb, NULL, 0, SBUF_AUTOEXTEND); 546 lomac_to_string(&subjlabel_sb, subjlabel); 547 sbuf_finish(&subjlabel_sb); 548 subjlabeltext = sbuf_data(&subjlabel_sb); 549 550 sbuf_new(&subjtext_sb, NULL, 0, SBUF_AUTOEXTEND); 551 lomac_to_string(&subjtext_sb, &subj->mac_lomac); 552 sbuf_finish(&subjtext_sb); 553 subjtext = sbuf_data(&subjtext_sb); 554 555 sbuf_new(&objlabel_sb, NULL, 0, SBUF_AUTOEXTEND); 556 lomac_to_string(&objlabel_sb, objlabel); 557 sbuf_finish(&objlabel_sb); 558 objlabeltext = sbuf_data(&objlabel_sb); 559 560 pgid = p->p_pgrp->pg_id; /* XXX could be stale? */ 561 if (vp != NULL && VOP_GETATTR(vp, &va, curthread->td_ucred) == 0) { 562 log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to" 563 " level %s after %s a level-%s %s (inode=%ju, " 564 "mountpount=%s)\n", 565 subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid, 566 p->p_comm, subjtext, actionname, objlabeltext, objname, 567 (uintmax_t)va.va_fileid, vp->v_mount->mnt_stat.f_mntonname); 568 } else { 569 log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to" 570 " level %s after %s a level-%s %s\n", 571 subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid, 572 p->p_comm, subjtext, actionname, objlabeltext, objname); 573 } 574 575 sbuf_delete(&subjlabel_sb); 576 sbuf_delete(&subjtext_sb); 577 sbuf_delete(&objlabel_sb); 578 579 return (0); 580 } 581 582 /* 583 * Relabel "to" to "from" only if "from" is a valid label (contains at least 584 * a single), as for a relabel operation which may or may not involve a 585 * relevant label. 586 */ 587 static void 588 try_relabel(struct mac_lomac *from, struct mac_lomac *to) 589 { 590 591 if (from->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 592 bzero(to, sizeof(*to)); 593 lomac_copy(from, to); 594 } 595 } 596 597 /* 598 * Policy module operations. 599 */ 600 static void 601 lomac_init(struct mac_policy_conf *conf) 602 { 603 604 } 605 606 /* 607 * Label operations. 608 */ 609 static void 610 lomac_init_label(struct label *label) 611 { 612 613 SLOT_SET(label, lomac_alloc(M_WAITOK)); 614 } 615 616 static int 617 lomac_init_label_waitcheck(struct label *label, int flag) 618 { 619 620 SLOT_SET(label, lomac_alloc(flag)); 621 if (SLOT(label) == NULL) 622 return (ENOMEM); 623 624 return (0); 625 } 626 627 static void 628 lomac_destroy_label(struct label *label) 629 { 630 631 lomac_free(SLOT(label)); 632 SLOT_SET(label, NULL); 633 } 634 635 static int 636 lomac_element_to_string(struct sbuf *sb, struct mac_lomac_element *element) 637 { 638 639 switch (element->mle_type) { 640 case MAC_LOMAC_TYPE_HIGH: 641 return (sbuf_printf(sb, "high")); 642 643 case MAC_LOMAC_TYPE_LOW: 644 return (sbuf_printf(sb, "low")); 645 646 case MAC_LOMAC_TYPE_EQUAL: 647 return (sbuf_printf(sb, "equal")); 648 649 case MAC_LOMAC_TYPE_GRADE: 650 return (sbuf_printf(sb, "%d", element->mle_grade)); 651 652 default: 653 panic("lomac_element_to_string: invalid type (%d)", 654 element->mle_type); 655 } 656 } 657 658 static int 659 lomac_to_string(struct sbuf *sb, struct mac_lomac *ml) 660 { 661 662 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 663 if (lomac_element_to_string(sb, &ml->ml_single) == -1) 664 return (EINVAL); 665 } 666 667 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) { 668 if (sbuf_putc(sb, '[') == -1) 669 return (EINVAL); 670 671 if (lomac_element_to_string(sb, &ml->ml_auxsingle) == -1) 672 return (EINVAL); 673 674 if (sbuf_putc(sb, ']') == -1) 675 return (EINVAL); 676 } 677 678 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { 679 if (sbuf_putc(sb, '(') == -1) 680 return (EINVAL); 681 682 if (lomac_element_to_string(sb, &ml->ml_rangelow) == -1) 683 return (EINVAL); 684 685 if (sbuf_putc(sb, '-') == -1) 686 return (EINVAL); 687 688 if (lomac_element_to_string(sb, &ml->ml_rangehigh) == -1) 689 return (EINVAL); 690 691 if (sbuf_putc(sb, ')') == -1) 692 return (EINVAL); 693 } 694 695 return (0); 696 } 697 698 static int 699 lomac_externalize_label(struct label *label, char *element_name, 700 struct sbuf *sb, int *claimed) 701 { 702 struct mac_lomac *ml; 703 704 if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0) 705 return (0); 706 707 (*claimed)++; 708 709 ml = SLOT(label); 710 711 return (lomac_to_string(sb, ml)); 712 } 713 714 static int 715 lomac_parse_element(struct mac_lomac_element *element, char *string) 716 { 717 718 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) { 719 element->mle_type = MAC_LOMAC_TYPE_HIGH; 720 element->mle_grade = MAC_LOMAC_TYPE_UNDEF; 721 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) { 722 element->mle_type = MAC_LOMAC_TYPE_LOW; 723 element->mle_grade = MAC_LOMAC_TYPE_UNDEF; 724 } else if (strcmp(string, "equal") == 0 || 725 strcmp(string, "eq") == 0) { 726 element->mle_type = MAC_LOMAC_TYPE_EQUAL; 727 element->mle_grade = MAC_LOMAC_TYPE_UNDEF; 728 } else { 729 char *p0, *p1; 730 int d; 731 732 p0 = string; 733 d = strtol(p0, &p1, 10); 734 735 if (d < 0 || d > 65535) 736 return (EINVAL); 737 element->mle_type = MAC_LOMAC_TYPE_GRADE; 738 element->mle_grade = d; 739 740 if (p1 == p0 || *p1 != '\0') 741 return (EINVAL); 742 } 743 744 return (0); 745 } 746 747 /* 748 * Note: destructively consumes the string, make a local copy before calling 749 * if that's a problem. 750 */ 751 static int 752 lomac_parse(struct mac_lomac *ml, char *string) 753 { 754 char *range, *rangeend, *rangehigh, *rangelow, *single, *auxsingle, 755 *auxsingleend; 756 int error; 757 758 /* Do we have a range? */ 759 single = string; 760 range = strchr(string, '('); 761 if (range == single) 762 single = NULL; 763 auxsingle = strchr(string, '['); 764 if (auxsingle == single) 765 single = NULL; 766 if (range != NULL && auxsingle != NULL) 767 return (EINVAL); 768 rangelow = rangehigh = NULL; 769 if (range != NULL) { 770 /* Nul terminate the end of the single string. */ 771 *range = '\0'; 772 range++; 773 rangelow = range; 774 rangehigh = strchr(rangelow, '-'); 775 if (rangehigh == NULL) 776 return (EINVAL); 777 rangehigh++; 778 if (*rangelow == '\0' || *rangehigh == '\0') 779 return (EINVAL); 780 rangeend = strchr(rangehigh, ')'); 781 if (rangeend == NULL) 782 return (EINVAL); 783 if (*(rangeend + 1) != '\0') 784 return (EINVAL); 785 /* Nul terminate the ends of the ranges. */ 786 *(rangehigh - 1) = '\0'; 787 *rangeend = '\0'; 788 } 789 KASSERT((rangelow != NULL && rangehigh != NULL) || 790 (rangelow == NULL && rangehigh == NULL), 791 ("lomac_internalize_label: range mismatch")); 792 if (auxsingle != NULL) { 793 /* Nul terminate the end of the single string. */ 794 *auxsingle = '\0'; 795 auxsingle++; 796 auxsingleend = strchr(auxsingle, ']'); 797 if (auxsingleend == NULL) 798 return (EINVAL); 799 if (*(auxsingleend + 1) != '\0') 800 return (EINVAL); 801 /* Nul terminate the end of the auxsingle. */ 802 *auxsingleend = '\0'; 803 } 804 805 bzero(ml, sizeof(*ml)); 806 if (single != NULL) { 807 error = lomac_parse_element(&ml->ml_single, single); 808 if (error) 809 return (error); 810 ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE; 811 } 812 813 if (auxsingle != NULL) { 814 error = lomac_parse_element(&ml->ml_auxsingle, auxsingle); 815 if (error) 816 return (error); 817 ml->ml_flags |= MAC_LOMAC_FLAG_AUX; 818 } 819 820 if (rangelow != NULL) { 821 error = lomac_parse_element(&ml->ml_rangelow, rangelow); 822 if (error) 823 return (error); 824 error = lomac_parse_element(&ml->ml_rangehigh, rangehigh); 825 if (error) 826 return (error); 827 ml->ml_flags |= MAC_LOMAC_FLAG_RANGE; 828 } 829 830 error = lomac_valid(ml); 831 if (error) 832 return (error); 833 834 return (0); 835 } 836 837 static int 838 lomac_internalize_label(struct label *label, char *element_name, 839 char *element_data, int *claimed) 840 { 841 struct mac_lomac *ml, ml_temp; 842 int error; 843 844 if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0) 845 return (0); 846 847 (*claimed)++; 848 849 error = lomac_parse(&ml_temp, element_data); 850 if (error) 851 return (error); 852 853 ml = SLOT(label); 854 *ml = ml_temp; 855 856 return (0); 857 } 858 859 static void 860 lomac_copy_label(struct label *src, struct label *dest) 861 { 862 863 *SLOT(dest) = *SLOT(src); 864 } 865 866 /* 867 * Object-specific entry point implementations are sorted alphabetically by 868 * object type name and then by operation. 869 */ 870 static int 871 lomac_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, 872 struct ifnet *ifp, struct label *ifplabel) 873 { 874 struct mac_lomac *a, *b; 875 876 if (!lomac_enabled) 877 return (0); 878 879 a = SLOT(dlabel); 880 b = SLOT(ifplabel); 881 882 if (lomac_equal_single(a, b)) 883 return (0); 884 return (EACCES); 885 } 886 887 static void 888 lomac_bpfdesc_create(struct ucred *cred, struct bpf_d *d, 889 struct label *dlabel) 890 { 891 struct mac_lomac *source, *dest; 892 893 source = SLOT(cred->cr_label); 894 dest = SLOT(dlabel); 895 896 lomac_copy_single(source, dest); 897 } 898 899 static void 900 lomac_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, 901 struct mbuf *m, struct label *mlabel) 902 { 903 struct mac_lomac *source, *dest; 904 905 source = SLOT(dlabel); 906 dest = SLOT(mlabel); 907 908 lomac_copy_single(source, dest); 909 } 910 911 static int 912 lomac_cred_check_relabel(struct ucred *cred, struct label *newlabel) 913 { 914 struct mac_lomac *subj, *new; 915 int error; 916 917 subj = SLOT(cred->cr_label); 918 new = SLOT(newlabel); 919 920 /* 921 * If there is a LOMAC label update for the credential, it may be an 922 * update of the single, range, or both. 923 */ 924 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH); 925 if (error) 926 return (error); 927 928 /* 929 * If the LOMAC label is to be changed, authorize as appropriate. 930 */ 931 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) { 932 /* 933 * Fill in the missing parts from the previous label. 934 */ 935 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 936 lomac_copy_single(subj, new); 937 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0) 938 lomac_copy_range(subj, new); 939 940 /* 941 * To change the LOMAC range on a credential, the new range 942 * label must be in the current range. 943 */ 944 if (!lomac_range_in_range(new, subj)) 945 return (EPERM); 946 947 /* 948 * To change the LOMAC single label on a credential, the new 949 * single label must be in the new range. Implicitly from 950 * the previous check, the new single is in the old range. 951 */ 952 if (!lomac_single_in_range(new, new)) 953 return (EPERM); 954 955 /* 956 * To have EQUAL in any component of the new credential LOMAC 957 * label, the subject must already have EQUAL in their label. 958 */ 959 if (lomac_contains_equal(new)) { 960 error = lomac_subject_privileged(subj); 961 if (error) 962 return (error); 963 } 964 965 /* 966 * XXXMAC: Additional consistency tests regarding the single 967 * and range of the new label might be performed here. 968 */ 969 } 970 971 return (0); 972 } 973 974 static int 975 lomac_cred_check_visible(struct ucred *cr1, struct ucred *cr2) 976 { 977 struct mac_lomac *subj, *obj; 978 979 if (!lomac_enabled) 980 return (0); 981 982 subj = SLOT(cr1->cr_label); 983 obj = SLOT(cr2->cr_label); 984 985 /* XXX: range */ 986 if (!lomac_dominate_single(obj, subj)) 987 return (ESRCH); 988 989 return (0); 990 } 991 992 static void 993 lomac_cred_create_init(struct ucred *cred) 994 { 995 struct mac_lomac *dest; 996 997 dest = SLOT(cred->cr_label); 998 999 lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0); 1000 lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0); 1001 } 1002 1003 static void 1004 lomac_cred_create_swapper(struct ucred *cred) 1005 { 1006 struct mac_lomac *dest; 1007 1008 dest = SLOT(cred->cr_label); 1009 1010 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1011 lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0); 1012 } 1013 1014 static void 1015 lomac_cred_relabel(struct ucred *cred, struct label *newlabel) 1016 { 1017 struct mac_lomac *source, *dest; 1018 1019 source = SLOT(newlabel); 1020 dest = SLOT(cred->cr_label); 1021 1022 try_relabel(source, dest); 1023 } 1024 1025 static void 1026 lomac_devfs_create_device(struct ucred *cred, struct mount *mp, 1027 struct cdev *dev, struct devfs_dirent *de, struct label *delabel) 1028 { 1029 struct mac_lomac *ml; 1030 const char *dn; 1031 int lomac_type; 1032 1033 ml = SLOT(delabel); 1034 dn = devtoname(dev); 1035 if (strcmp(dn, "null") == 0 || 1036 strcmp(dn, "zero") == 0 || 1037 strcmp(dn, "random") == 0 || 1038 strncmp(dn, "fd/", strlen("fd/")) == 0 || 1039 strncmp(dn, "ttyv", strlen("ttyv")) == 0) 1040 lomac_type = MAC_LOMAC_TYPE_EQUAL; 1041 else if (ptys_equal && 1042 (strncmp(dn, "ttyp", strlen("ttyp")) == 0 || 1043 strncmp(dn, "pts/", strlen("pts/")) == 0 || 1044 strncmp(dn, "ptyp", strlen("ptyp")) == 0)) 1045 lomac_type = MAC_LOMAC_TYPE_EQUAL; 1046 else 1047 lomac_type = MAC_LOMAC_TYPE_HIGH; 1048 lomac_set_single(ml, lomac_type, 0); 1049 } 1050 1051 static void 1052 lomac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, 1053 struct devfs_dirent *de, struct label *delabel) 1054 { 1055 struct mac_lomac *ml; 1056 1057 ml = SLOT(delabel); 1058 lomac_set_single(ml, MAC_LOMAC_TYPE_HIGH, 0); 1059 } 1060 1061 static void 1062 lomac_devfs_create_symlink(struct ucred *cred, struct mount *mp, 1063 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, 1064 struct label *delabel) 1065 { 1066 struct mac_lomac *source, *dest; 1067 1068 source = SLOT(cred->cr_label); 1069 dest = SLOT(delabel); 1070 1071 lomac_copy_single(source, dest); 1072 } 1073 1074 static void 1075 lomac_devfs_update(struct mount *mp, struct devfs_dirent *de, 1076 struct label *delabel, struct vnode *vp, struct label *vplabel) 1077 { 1078 struct mac_lomac *source, *dest; 1079 1080 source = SLOT(vplabel); 1081 dest = SLOT(delabel); 1082 1083 lomac_copy(source, dest); 1084 } 1085 1086 static void 1087 lomac_devfs_vnode_associate(struct mount *mp, struct label *mplabel, 1088 struct devfs_dirent *de, struct label *delabel, struct vnode *vp, 1089 struct label *vplabel) 1090 { 1091 struct mac_lomac *source, *dest; 1092 1093 source = SLOT(delabel); 1094 dest = SLOT(vplabel); 1095 1096 lomac_copy_single(source, dest); 1097 } 1098 1099 static int 1100 lomac_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, 1101 struct label *ifplabel, struct label *newlabel) 1102 { 1103 struct mac_lomac *subj, *new; 1104 int error; 1105 1106 subj = SLOT(cred->cr_label); 1107 new = SLOT(newlabel); 1108 1109 /* 1110 * If there is a LOMAC label update for the interface, it may be an 1111 * update of the single, range, or both. 1112 */ 1113 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH); 1114 if (error) 1115 return (error); 1116 1117 /* 1118 * Relabling network interfaces requires LOMAC privilege. 1119 */ 1120 error = lomac_subject_privileged(subj); 1121 if (error) 1122 return (error); 1123 1124 /* 1125 * If the LOMAC label is to be changed, authorize as appropriate. 1126 */ 1127 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) { 1128 /* 1129 * Fill in the missing parts from the previous label. 1130 */ 1131 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 1132 lomac_copy_single(subj, new); 1133 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0) 1134 lomac_copy_range(subj, new); 1135 1136 /* 1137 * Rely on the traditional superuser status for the LOMAC 1138 * interface relabel requirements. XXXMAC: This will go 1139 * away. 1140 * 1141 * XXXRW: This is also redundant to a higher layer check. 1142 */ 1143 error = priv_check_cred(cred, PRIV_NET_SETIFMAC); 1144 if (error) 1145 return (EPERM); 1146 1147 /* 1148 * XXXMAC: Additional consistency tests regarding the single 1149 * and the range of the new label might be performed here. 1150 */ 1151 } 1152 1153 return (0); 1154 } 1155 1156 static int 1157 lomac_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, 1158 struct mbuf *m, struct label *mlabel) 1159 { 1160 struct mac_lomac *p, *i; 1161 1162 if (!lomac_enabled) 1163 return (0); 1164 1165 p = SLOT(mlabel); 1166 i = SLOT(ifplabel); 1167 1168 return (lomac_single_in_range(p, i) ? 0 : EACCES); 1169 } 1170 1171 static void 1172 lomac_ifnet_create(struct ifnet *ifp, struct label *ifplabel) 1173 { 1174 char tifname[IFNAMSIZ], *p, *q; 1175 char tiflist[sizeof(trusted_interfaces)]; 1176 struct mac_lomac *dest; 1177 int len, grade; 1178 1179 dest = SLOT(ifplabel); 1180 1181 if (ifp->if_type == IFT_LOOP) { 1182 grade = MAC_LOMAC_TYPE_EQUAL; 1183 goto set; 1184 } 1185 1186 if (trust_all_interfaces) { 1187 grade = MAC_LOMAC_TYPE_HIGH; 1188 goto set; 1189 } 1190 1191 grade = MAC_LOMAC_TYPE_LOW; 1192 1193 if (trusted_interfaces[0] == '\0' || 1194 !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) 1195 goto set; 1196 1197 bzero(tiflist, sizeof(tiflist)); 1198 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) 1199 if(*p != ' ' && *p != '\t') 1200 *q = *p; 1201 1202 for (p = q = tiflist;; p++) { 1203 if (*p == ',' || *p == '\0') { 1204 len = p - q; 1205 if (len < IFNAMSIZ) { 1206 bzero(tifname, sizeof(tifname)); 1207 bcopy(q, tifname, len); 1208 if (strcmp(tifname, ifp->if_xname) == 0) { 1209 grade = MAC_LOMAC_TYPE_HIGH; 1210 break; 1211 } 1212 } 1213 else { 1214 *p = '\0'; 1215 printf("MAC/LOMAC warning: interface name " 1216 "\"%s\" is too long (must be < %d)\n", 1217 q, IFNAMSIZ); 1218 } 1219 if (*p == '\0') 1220 break; 1221 q = p + 1; 1222 } 1223 } 1224 set: 1225 lomac_set_single(dest, grade, 0); 1226 lomac_set_range(dest, grade, 0, grade, 0); 1227 } 1228 1229 static void 1230 lomac_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, 1231 struct mbuf *m, struct label *mlabel) 1232 { 1233 struct mac_lomac *source, *dest; 1234 1235 source = SLOT(ifplabel); 1236 dest = SLOT(mlabel); 1237 1238 lomac_copy_single(source, dest); 1239 } 1240 1241 static void 1242 lomac_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, 1243 struct label *ifplabel, struct label *newlabel) 1244 { 1245 struct mac_lomac *source, *dest; 1246 1247 source = SLOT(newlabel); 1248 dest = SLOT(ifplabel); 1249 1250 try_relabel(source, dest); 1251 } 1252 1253 static int 1254 lomac_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, 1255 struct mbuf *m, struct label *mlabel) 1256 { 1257 struct mac_lomac *p, *i; 1258 1259 if (!lomac_enabled) 1260 return (0); 1261 1262 p = SLOT(mlabel); 1263 i = SLOT(inplabel); 1264 1265 return (lomac_equal_single(p, i) ? 0 : EACCES); 1266 } 1267 1268 static int 1269 lomac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, 1270 struct label *inplabel) 1271 { 1272 struct mac_lomac *subj, *obj; 1273 1274 if (!lomac_enabled) 1275 return (0); 1276 1277 subj = SLOT(cred->cr_label); 1278 obj = SLOT(inplabel); 1279 1280 if (!lomac_dominate_single(obj, subj)) 1281 return (ENOENT); 1282 1283 return (0); 1284 } 1285 1286 static void 1287 lomac_inpcb_create(struct socket *so, struct label *solabel, 1288 struct inpcb *inp, struct label *inplabel) 1289 { 1290 struct mac_lomac *source, *dest; 1291 1292 source = SLOT(solabel); 1293 dest = SLOT(inplabel); 1294 1295 lomac_copy_single(source, dest); 1296 } 1297 1298 static void 1299 lomac_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, 1300 struct mbuf *m, struct label *mlabel) 1301 { 1302 struct mac_lomac *source, *dest; 1303 1304 source = SLOT(inplabel); 1305 dest = SLOT(mlabel); 1306 1307 lomac_copy_single(source, dest); 1308 } 1309 1310 static void 1311 lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel, 1312 struct inpcb *inp, struct label *inplabel) 1313 { 1314 struct mac_lomac *source, *dest; 1315 1316 SOCK_LOCK_ASSERT(so); 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_netinet_arp_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_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1459 struct mbuf *msend, struct label *msendlabel) 1460 { 1461 struct mac_lomac *source, *dest; 1462 1463 source = SLOT(mrecvlabel); 1464 dest = SLOT(msendlabel); 1465 1466 lomac_copy_single(source, dest); 1467 } 1468 1469 static void 1470 lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel) 1471 { 1472 struct mac_lomac *dest; 1473 1474 dest = SLOT(mlabel); 1475 1476 /* XXX: where is the label for the firewall really coming from? */ 1477 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1478 } 1479 1480 static void 1481 lomac_netinet_fragment(struct mbuf *m, struct label *mlabel, 1482 struct mbuf *frag, struct label *fraglabel) 1483 { 1484 struct mac_lomac *source, *dest; 1485 1486 source = SLOT(mlabel); 1487 dest = SLOT(fraglabel); 1488 1489 lomac_copy_single(source, dest); 1490 } 1491 1492 static void 1493 lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, 1494 struct mbuf *msend, struct label *msendlabel) 1495 { 1496 struct mac_lomac *source, *dest; 1497 1498 source = SLOT(mrecvlabel); 1499 dest = SLOT(msendlabel); 1500 1501 lomac_copy_single(source, dest); 1502 } 1503 1504 static void 1505 lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, 1506 struct mbuf *m, struct label *mlabel) 1507 { 1508 struct mac_lomac *dest; 1509 1510 dest = SLOT(mlabel); 1511 1512 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); 1513 } 1514 1515 static void 1516 lomac_netinet6_nd6_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 int 1527 lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 1528 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) 1529 { 1530 1531 if (!lomac_enabled) 1532 return (0); 1533 1534 /* XXX: This will be implemented soon... */ 1535 1536 return (0); 1537 } 1538 1539 static int 1540 lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp, 1541 struct label *pplabel) 1542 { 1543 struct mac_lomac *subj, *obj; 1544 1545 if (!lomac_enabled) 1546 return (0); 1547 1548 subj = SLOT(cred->cr_label); 1549 obj = SLOT(pplabel); 1550 1551 if (!lomac_dominate_single(obj, subj)) 1552 return (maybe_demote(subj, obj, "reading", "pipe", NULL)); 1553 1554 return (0); 1555 } 1556 1557 static int 1558 lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 1559 struct label *pplabel, struct label *newlabel) 1560 { 1561 struct mac_lomac *subj, *obj, *new; 1562 int error; 1563 1564 new = SLOT(newlabel); 1565 subj = SLOT(cred->cr_label); 1566 obj = SLOT(pplabel); 1567 1568 /* 1569 * If there is a LOMAC label update for a pipe, it must be a single 1570 * update. 1571 */ 1572 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); 1573 if (error) 1574 return (error); 1575 1576 /* 1577 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must 1578 * authorize the relabel. 1579 */ 1580 if (!lomac_single_in_range(obj, subj)) 1581 return (EPERM); 1582 1583 /* 1584 * If the LOMAC label is to be changed, authorize as appropriate. 1585 */ 1586 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 1587 /* 1588 * To change the LOMAC label on a pipe, the new pipe label 1589 * must be in the subject range. 1590 */ 1591 if (!lomac_single_in_range(new, subj)) 1592 return (EPERM); 1593 1594 /* 1595 * To change the LOMAC label on a pipe to be EQUAL, the 1596 * subject must have appropriate privilege. 1597 */ 1598 if (lomac_contains_equal(new)) { 1599 error = lomac_subject_privileged(subj); 1600 if (error) 1601 return (error); 1602 } 1603 } 1604 1605 return (0); 1606 } 1607 1608 static int 1609 lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp, 1610 struct label *pplabel) 1611 { 1612 struct mac_lomac *subj, *obj; 1613 1614 if (!lomac_enabled) 1615 return (0); 1616 1617 subj = SLOT(cred->cr_label); 1618 obj = SLOT(pplabel); 1619 1620 if (!lomac_subject_dominate(subj, obj)) 1621 return (EACCES); 1622 1623 return (0); 1624 } 1625 1626 static void 1627 lomac_pipe_create(struct ucred *cred, struct pipepair *pp, 1628 struct label *pplabel) 1629 { 1630 struct mac_lomac *source, *dest; 1631 1632 source = SLOT(cred->cr_label); 1633 dest = SLOT(pplabel); 1634 1635 lomac_copy_single(source, dest); 1636 } 1637 1638 static void 1639 lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp, 1640 struct label *pplabel, struct label *newlabel) 1641 { 1642 struct mac_lomac *source, *dest; 1643 1644 source = SLOT(newlabel); 1645 dest = SLOT(pplabel); 1646 1647 try_relabel(source, dest); 1648 } 1649 1650 /* 1651 * Some system privileges are allowed regardless of integrity grade; others 1652 * are allowed only when running with privilege with respect to the LOMAC 1653 * policy as they might otherwise allow bypassing of the integrity policy. 1654 */ 1655 static int 1656 lomac_priv_check(struct ucred *cred, int priv) 1657 { 1658 struct mac_lomac *subj; 1659 int error; 1660 1661 if (!lomac_enabled) 1662 return (0); 1663 1664 /* 1665 * Exempt only specific privileges from the LOMAC integrity policy. 1666 */ 1667 switch (priv) { 1668 case PRIV_KTRACE: 1669 case PRIV_MSGBUF: 1670 1671 /* 1672 * Allow processes to manipulate basic process audit properties, and 1673 * to submit audit records. 1674 */ 1675 case PRIV_AUDIT_GETAUDIT: 1676 case PRIV_AUDIT_SETAUDIT: 1677 case PRIV_AUDIT_SUBMIT: 1678 1679 /* 1680 * Allow processes to manipulate their regular UNIX credentials. 1681 */ 1682 case PRIV_CRED_SETUID: 1683 case PRIV_CRED_SETEUID: 1684 case PRIV_CRED_SETGID: 1685 case PRIV_CRED_SETEGID: 1686 case PRIV_CRED_SETGROUPS: 1687 case PRIV_CRED_SETREUID: 1688 case PRIV_CRED_SETREGID: 1689 case PRIV_CRED_SETRESUID: 1690 case PRIV_CRED_SETRESGID: 1691 1692 /* 1693 * Allow processes to perform system monitoring. 1694 */ 1695 case PRIV_SEEOTHERGIDS: 1696 case PRIV_SEEOTHERUIDS: 1697 break; 1698 1699 /* 1700 * Allow access to general process debugging facilities. We 1701 * separately control debugging based on MAC label. 1702 */ 1703 case PRIV_DEBUG_DIFFCRED: 1704 case PRIV_DEBUG_SUGID: 1705 case PRIV_DEBUG_UNPRIV: 1706 1707 /* 1708 * Allow manipulating jails. 1709 */ 1710 case PRIV_JAIL_ATTACH: 1711 1712 /* 1713 * Allow privilege with respect to the Partition policy, but not the 1714 * Privs policy. 1715 */ 1716 case PRIV_MAC_PARTITION: 1717 1718 /* 1719 * Allow privilege with respect to process resource limits and login 1720 * context. 1721 */ 1722 case PRIV_PROC_LIMIT: 1723 case PRIV_PROC_SETLOGIN: 1724 case PRIV_PROC_SETRLIMIT: 1725 1726 /* 1727 * Allow System V and POSIX IPC privileges. 1728 */ 1729 case PRIV_IPC_READ: 1730 case PRIV_IPC_WRITE: 1731 case PRIV_IPC_ADMIN: 1732 case PRIV_IPC_MSGSIZE: 1733 case PRIV_MQ_ADMIN: 1734 1735 /* 1736 * Allow certain scheduler manipulations -- possibly this should be 1737 * controlled by more fine-grained policy, as potentially low 1738 * integrity processes can deny CPU to higher integrity ones. 1739 */ 1740 case PRIV_SCHED_DIFFCRED: 1741 case PRIV_SCHED_SETPRIORITY: 1742 case PRIV_SCHED_RTPRIO: 1743 case PRIV_SCHED_SETPOLICY: 1744 case PRIV_SCHED_SET: 1745 case PRIV_SCHED_SETPARAM: 1746 1747 /* 1748 * More IPC privileges. 1749 */ 1750 case PRIV_SEM_WRITE: 1751 1752 /* 1753 * Allow signaling privileges subject to integrity policy. 1754 */ 1755 case PRIV_SIGNAL_DIFFCRED: 1756 case PRIV_SIGNAL_SUGID: 1757 1758 /* 1759 * Allow access to only limited sysctls from lower integrity levels; 1760 * piggy-back on the Jail definition. 1761 */ 1762 case PRIV_SYSCTL_WRITEJAIL: 1763 1764 /* 1765 * Allow TTY-based privileges, subject to general device access using 1766 * labels on TTY device nodes, but not console privilege. 1767 */ 1768 case PRIV_TTY_DRAINWAIT: 1769 case PRIV_TTY_DTRWAIT: 1770 case PRIV_TTY_EXCLUSIVE: 1771 case PRIV_TTY_STI: 1772 case PRIV_TTY_SETA: 1773 1774 /* 1775 * Grant most VFS privileges, as almost all are in practice bounded 1776 * by more specific checks using labels. 1777 */ 1778 case PRIV_VFS_READ: 1779 case PRIV_VFS_WRITE: 1780 case PRIV_VFS_ADMIN: 1781 case PRIV_VFS_EXEC: 1782 case PRIV_VFS_LOOKUP: 1783 case PRIV_VFS_CHFLAGS_DEV: 1784 case PRIV_VFS_CHOWN: 1785 case PRIV_VFS_CHROOT: 1786 case PRIV_VFS_RETAINSUGID: 1787 case PRIV_VFS_EXCEEDQUOTA: 1788 case PRIV_VFS_FCHROOT: 1789 case PRIV_VFS_FHOPEN: 1790 case PRIV_VFS_FHSTATFS: 1791 case PRIV_VFS_GENERATION: 1792 case PRIV_VFS_GETFH: 1793 case PRIV_VFS_GETQUOTA: 1794 case PRIV_VFS_LINK: 1795 case PRIV_VFS_MOUNT: 1796 case PRIV_VFS_MOUNT_OWNER: 1797 case PRIV_VFS_MOUNT_PERM: 1798 case PRIV_VFS_MOUNT_SUIDDIR: 1799 case PRIV_VFS_MOUNT_NONUSER: 1800 case PRIV_VFS_SETGID: 1801 case PRIV_VFS_STICKYFILE: 1802 case PRIV_VFS_SYSFLAGS: 1803 case PRIV_VFS_UNMOUNT: 1804 1805 /* 1806 * Allow VM privileges; it would be nice if these were subject to 1807 * resource limits. 1808 */ 1809 case PRIV_VM_MADV_PROTECT: 1810 case PRIV_VM_MLOCK: 1811 case PRIV_VM_MUNLOCK: 1812 case PRIV_VM_SWAP_NOQUOTA: 1813 case PRIV_VM_SWAP_NORLIMIT: 1814 1815 /* 1816 * Allow some but not all network privileges. In general, dont allow 1817 * reconfiguring the network stack, just normal use. 1818 */ 1819 case PRIV_NETINET_RESERVEDPORT: 1820 case PRIV_NETINET_RAW: 1821 case PRIV_NETINET_REUSEPORT: 1822 break; 1823 1824 /* 1825 * All remaining system privileges are allow only if the process 1826 * holds privilege with respect to the LOMAC policy. 1827 */ 1828 default: 1829 subj = SLOT(cred->cr_label); 1830 error = lomac_subject_privileged(subj); 1831 if (error) 1832 return (error); 1833 } 1834 return (0); 1835 } 1836 1837 static int 1838 lomac_proc_check_debug(struct ucred *cred, struct proc *p) 1839 { 1840 struct mac_lomac *subj, *obj; 1841 1842 if (!lomac_enabled) 1843 return (0); 1844 1845 subj = SLOT(cred->cr_label); 1846 obj = SLOT(p->p_ucred->cr_label); 1847 1848 /* XXX: range checks */ 1849 if (!lomac_dominate_single(obj, subj)) 1850 return (ESRCH); 1851 if (!lomac_subject_dominate(subj, obj)) 1852 return (EACCES); 1853 1854 return (0); 1855 } 1856 1857 static int 1858 lomac_proc_check_sched(struct ucred *cred, struct proc *p) 1859 { 1860 struct mac_lomac *subj, *obj; 1861 1862 if (!lomac_enabled) 1863 return (0); 1864 1865 subj = SLOT(cred->cr_label); 1866 obj = SLOT(p->p_ucred->cr_label); 1867 1868 /* XXX: range checks */ 1869 if (!lomac_dominate_single(obj, subj)) 1870 return (ESRCH); 1871 if (!lomac_subject_dominate(subj, obj)) 1872 return (EACCES); 1873 1874 return (0); 1875 } 1876 1877 static int 1878 lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum) 1879 { 1880 struct mac_lomac *subj, *obj; 1881 1882 if (!lomac_enabled) 1883 return (0); 1884 1885 subj = SLOT(cred->cr_label); 1886 obj = SLOT(p->p_ucred->cr_label); 1887 1888 /* XXX: range checks */ 1889 if (!lomac_dominate_single(obj, subj)) 1890 return (ESRCH); 1891 if (!lomac_subject_dominate(subj, obj)) 1892 return (EACCES); 1893 1894 return (0); 1895 } 1896 1897 static void 1898 lomac_proc_destroy_label(struct label *label) 1899 { 1900 1901 mtx_destroy(&PSLOT(label)->mtx); 1902 free(PSLOT(label), M_LOMAC); 1903 PSLOT_SET(label, NULL); 1904 } 1905 1906 static void 1907 lomac_proc_init_label(struct label *label) 1908 { 1909 1910 PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC, 1911 M_ZERO | M_WAITOK)); 1912 mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF); 1913 } 1914 1915 static int 1916 lomac_socket_check_deliver(struct socket *so, struct label *solabel, 1917 struct mbuf *m, struct label *mlabel) 1918 { 1919 struct mac_lomac *p, *s; 1920 int error; 1921 1922 if (!lomac_enabled) 1923 return (0); 1924 1925 p = SLOT(mlabel); 1926 s = SLOT(solabel); 1927 1928 SOCK_LOCK(so); 1929 error = lomac_equal_single(p, s) ? 0 : EACCES; 1930 SOCK_UNLOCK(so); 1931 return (error); 1932 } 1933 1934 static int 1935 lomac_socket_check_relabel(struct ucred *cred, struct socket *so, 1936 struct label *solabel, struct label *newlabel) 1937 { 1938 struct mac_lomac *subj, *obj, *new; 1939 int error; 1940 1941 SOCK_LOCK_ASSERT(so); 1942 1943 new = SLOT(newlabel); 1944 subj = SLOT(cred->cr_label); 1945 obj = SLOT(solabel); 1946 1947 /* 1948 * If there is a LOMAC label update for the socket, it may be an 1949 * update of single. 1950 */ 1951 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); 1952 if (error) 1953 return (error); 1954 1955 /* 1956 * To relabel a socket, the old socket single must be in the subject 1957 * range. 1958 */ 1959 if (!lomac_single_in_range(obj, subj)) 1960 return (EPERM); 1961 1962 /* 1963 * If the LOMAC label is to be changed, authorize as appropriate. 1964 */ 1965 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 1966 /* 1967 * To relabel a socket, the new socket single must be in the 1968 * subject range. 1969 */ 1970 if (!lomac_single_in_range(new, subj)) 1971 return (EPERM); 1972 1973 /* 1974 * To change the LOMAC label on the socket to contain EQUAL, 1975 * the subject must have appropriate privilege. 1976 */ 1977 if (lomac_contains_equal(new)) { 1978 error = lomac_subject_privileged(subj); 1979 if (error) 1980 return (error); 1981 } 1982 } 1983 1984 return (0); 1985 } 1986 1987 static int 1988 lomac_socket_check_visible(struct ucred *cred, struct socket *so, 1989 struct label *solabel) 1990 { 1991 struct mac_lomac *subj, *obj; 1992 1993 if (!lomac_enabled) 1994 return (0); 1995 1996 subj = SLOT(cred->cr_label); 1997 obj = SLOT(solabel); 1998 1999 SOCK_LOCK(so); 2000 if (!lomac_dominate_single(obj, subj)) { 2001 SOCK_UNLOCK(so); 2002 return (ENOENT); 2003 } 2004 SOCK_UNLOCK(so); 2005 2006 return (0); 2007 } 2008 2009 static void 2010 lomac_socket_create(struct ucred *cred, struct socket *so, 2011 struct label *solabel) 2012 { 2013 struct mac_lomac *source, *dest; 2014 2015 source = SLOT(cred->cr_label); 2016 dest = SLOT(solabel); 2017 2018 lomac_copy_single(source, dest); 2019 } 2020 2021 static void 2022 lomac_socket_create_mbuf(struct socket *so, struct label *solabel, 2023 struct mbuf *m, struct label *mlabel) 2024 { 2025 struct mac_lomac *source, *dest; 2026 2027 source = SLOT(solabel); 2028 dest = SLOT(mlabel); 2029 2030 SOCK_LOCK(so); 2031 lomac_copy_single(source, dest); 2032 SOCK_UNLOCK(so); 2033 } 2034 2035 static void 2036 lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel, 2037 struct socket *newso, struct label *newsolabel) 2038 { 2039 struct mac_lomac source, *dest; 2040 2041 SOCK_LOCK(oldso); 2042 source = *SLOT(oldsolabel); 2043 SOCK_UNLOCK(oldso); 2044 2045 dest = SLOT(newsolabel); 2046 2047 SOCK_LOCK(newso); 2048 lomac_copy_single(&source, dest); 2049 SOCK_UNLOCK(newso); 2050 } 2051 2052 static void 2053 lomac_socket_relabel(struct ucred *cred, struct socket *so, 2054 struct label *solabel, struct label *newlabel) 2055 { 2056 struct mac_lomac *source, *dest; 2057 2058 SOCK_LOCK_ASSERT(so); 2059 2060 source = SLOT(newlabel); 2061 dest = SLOT(solabel); 2062 2063 try_relabel(source, dest); 2064 } 2065 2066 static void 2067 lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, 2068 struct socket *so, struct label *sopeerlabel) 2069 { 2070 struct mac_lomac *source, *dest; 2071 2072 source = SLOT(mlabel); 2073 dest = SLOT(sopeerlabel); 2074 2075 SOCK_LOCK(so); 2076 lomac_copy_single(source, dest); 2077 SOCK_UNLOCK(so); 2078 } 2079 2080 static void 2081 lomac_socketpeer_set_from_socket(struct socket *oldso, 2082 struct label *oldsolabel, struct socket *newso, 2083 struct label *newsopeerlabel) 2084 { 2085 struct mac_lomac source, *dest; 2086 2087 SOCK_LOCK(oldso); 2088 source = *SLOT(oldsolabel); 2089 SOCK_UNLOCK(oldso); 2090 2091 dest = SLOT(newsopeerlabel); 2092 2093 SOCK_LOCK(newso); 2094 lomac_copy_single(&source, dest); 2095 SOCK_UNLOCK(newso); 2096 } 2097 2098 static void 2099 lomac_syncache_create(struct label *label, struct inpcb *inp) 2100 { 2101 struct mac_lomac *source, *dest; 2102 2103 source = SLOT(inp->inp_label); 2104 dest = SLOT(label); 2105 lomac_copy(source, dest); 2106 } 2107 2108 static void 2109 lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, 2110 struct label *mlabel) 2111 { 2112 struct mac_lomac *source, *dest; 2113 2114 source = SLOT(sc_label); 2115 dest = SLOT(mlabel); 2116 lomac_copy(source, dest); 2117 } 2118 2119 static int 2120 lomac_system_check_acct(struct ucred *cred, struct vnode *vp, 2121 struct label *vplabel) 2122 { 2123 struct mac_lomac *subj, *obj; 2124 2125 if (!lomac_enabled) 2126 return (0); 2127 2128 subj = SLOT(cred->cr_label); 2129 obj = SLOT(vplabel); 2130 2131 if (lomac_subject_privileged(subj)) 2132 return (EPERM); 2133 2134 if (!lomac_high_single(obj)) 2135 return (EACCES); 2136 2137 return (0); 2138 } 2139 2140 static int 2141 lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp, 2142 struct label *vplabel) 2143 { 2144 struct mac_lomac *subj, *obj; 2145 2146 if (!lomac_enabled) 2147 return (0); 2148 2149 subj = SLOT(cred->cr_label); 2150 obj = SLOT(vplabel); 2151 2152 if (lomac_subject_privileged(subj)) 2153 return (EPERM); 2154 2155 if (!lomac_high_single(obj)) 2156 return (EACCES); 2157 2158 return (0); 2159 } 2160 2161 static int 2162 lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp, 2163 struct label *vplabel) 2164 { 2165 struct mac_lomac *subj; 2166 2167 if (!lomac_enabled) 2168 return (0); 2169 2170 subj = SLOT(cred->cr_label); 2171 2172 if (lomac_subject_privileged(subj)) 2173 return (EPERM); 2174 2175 return (0); 2176 } 2177 2178 static int 2179 lomac_system_check_swapon(struct ucred *cred, struct vnode *vp, 2180 struct label *vplabel) 2181 { 2182 struct mac_lomac *subj, *obj; 2183 2184 if (!lomac_enabled) 2185 return (0); 2186 2187 subj = SLOT(cred->cr_label); 2188 obj = SLOT(vplabel); 2189 2190 if (lomac_subject_privileged(subj)) 2191 return (EPERM); 2192 2193 if (!lomac_high_single(obj)) 2194 return (EACCES); 2195 2196 return (0); 2197 } 2198 2199 static int 2200 lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 2201 void *arg1, int arg2, struct sysctl_req *req) 2202 { 2203 struct mac_lomac *subj; 2204 2205 if (!lomac_enabled) 2206 return (0); 2207 2208 subj = SLOT(cred->cr_label); 2209 2210 /* 2211 * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high, 2212 * but also require privilege to change them. 2213 */ 2214 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { 2215 #ifdef notdef 2216 if (!lomac_subject_dominate_high(subj)) 2217 return (EACCES); 2218 #endif 2219 2220 if (lomac_subject_privileged(subj)) 2221 return (EPERM); 2222 } 2223 2224 return (0); 2225 } 2226 2227 static void 2228 lomac_thread_userret(struct thread *td) 2229 { 2230 struct proc *p = td->td_proc; 2231 struct mac_lomac_proc *subj = PSLOT(p->p_label); 2232 struct ucred *newcred, *oldcred; 2233 int dodrop; 2234 2235 mtx_lock(&subj->mtx); 2236 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) { 2237 dodrop = 0; 2238 mtx_unlock(&subj->mtx); 2239 newcred = crget(); 2240 /* 2241 * Prevent a lock order reversal in mac_proc_vm_revoke; 2242 * ideally, the other user of subj->mtx wouldn't be holding 2243 * Giant. 2244 */ 2245 mtx_lock(&Giant); 2246 PROC_LOCK(p); 2247 mtx_lock(&subj->mtx); 2248 /* 2249 * Check if we lost the race while allocating the cred. 2250 */ 2251 if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) { 2252 crfree(newcred); 2253 goto out; 2254 } 2255 oldcred = p->p_ucred; 2256 crcopy(newcred, oldcred); 2257 crhold(newcred); 2258 lomac_copy(&subj->mac_lomac, SLOT(newcred->cr_label)); 2259 proc_set_cred(p, newcred); 2260 crfree(oldcred); 2261 dodrop = 1; 2262 out: 2263 mtx_unlock(&subj->mtx); 2264 PROC_UNLOCK(p); 2265 if (dodrop) 2266 mac_proc_vm_revoke(curthread); 2267 mtx_unlock(&Giant); 2268 } else { 2269 mtx_unlock(&subj->mtx); 2270 } 2271 } 2272 2273 static int 2274 lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel, 2275 struct vnode *vp, struct label *vplabel) 2276 { 2277 struct mac_lomac ml_temp, *source, *dest; 2278 int buflen, error; 2279 2280 source = SLOT(mplabel); 2281 dest = SLOT(vplabel); 2282 2283 buflen = sizeof(ml_temp); 2284 bzero(&ml_temp, buflen); 2285 2286 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2287 MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread); 2288 if (error == ENOATTR || error == EOPNOTSUPP) { 2289 /* Fall back to the mntlabel. */ 2290 lomac_copy_single(source, dest); 2291 return (0); 2292 } else if (error) 2293 return (error); 2294 2295 if (buflen != sizeof(ml_temp)) { 2296 if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) { 2297 printf("lomac_vnode_associate_extattr: bad size %d\n", 2298 buflen); 2299 return (EPERM); 2300 } 2301 bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle)); 2302 buflen = sizeof(ml_temp); 2303 (void)vn_extattr_set(vp, IO_NODELOCKED, 2304 MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME, 2305 buflen, (char *)&ml_temp, curthread); 2306 } 2307 if (lomac_valid(&ml_temp) != 0) { 2308 printf("lomac_vnode_associate_extattr: invalid\n"); 2309 return (EPERM); 2310 } 2311 if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) != 2312 MAC_LOMAC_FLAG_SINGLE) { 2313 printf("lomac_vnode_associate_extattr: not single\n"); 2314 return (EPERM); 2315 } 2316 2317 lomac_copy_single(&ml_temp, dest); 2318 return (0); 2319 } 2320 2321 static void 2322 lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, 2323 struct vnode *vp, struct label *vplabel) 2324 { 2325 struct mac_lomac *source, *dest; 2326 2327 source = SLOT(mplabel); 2328 dest = SLOT(vplabel); 2329 2330 lomac_copy_single(source, dest); 2331 } 2332 2333 static int 2334 lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp, 2335 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 2336 { 2337 struct mac_lomac *subj, *obj; 2338 2339 if (!lomac_enabled) 2340 return (0); 2341 2342 subj = SLOT(cred->cr_label); 2343 obj = SLOT(dvplabel); 2344 2345 if (!lomac_subject_dominate(subj, obj)) 2346 return (EACCES); 2347 if (obj->ml_flags & MAC_LOMAC_FLAG_AUX && 2348 !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle)) 2349 return (EACCES); 2350 2351 return (0); 2352 } 2353 2354 static int 2355 lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, 2356 struct label *vplabel, acl_type_t type) 2357 { 2358 struct mac_lomac *subj, *obj; 2359 2360 if (!lomac_enabled) 2361 return (0); 2362 2363 subj = SLOT(cred->cr_label); 2364 obj = SLOT(vplabel); 2365 2366 if (!lomac_subject_dominate(subj, obj)) 2367 return (EACCES); 2368 2369 return (0); 2370 } 2371 2372 static int 2373 lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp, 2374 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2375 struct componentname *cnp) 2376 { 2377 struct mac_lomac *subj, *obj; 2378 2379 if (!lomac_enabled) 2380 return (0); 2381 2382 subj = SLOT(cred->cr_label); 2383 obj = SLOT(dvplabel); 2384 2385 if (!lomac_subject_dominate(subj, obj)) 2386 return (EACCES); 2387 2388 obj = SLOT(vplabel); 2389 2390 if (!lomac_subject_dominate(subj, obj)) 2391 return (EACCES); 2392 2393 return (0); 2394 } 2395 2396 static int 2397 lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp, 2398 struct label *vplabel, int prot, int flags) 2399 { 2400 struct mac_lomac *subj, *obj; 2401 2402 /* 2403 * Rely on the use of open()-time protections to handle 2404 * non-revocation cases. 2405 */ 2406 if (!lomac_enabled) 2407 return (0); 2408 2409 subj = SLOT(cred->cr_label); 2410 obj = SLOT(vplabel); 2411 2412 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { 2413 if (!lomac_subject_dominate(subj, obj)) 2414 return (EACCES); 2415 } 2416 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2417 if (!lomac_dominate_single(obj, subj)) 2418 return (maybe_demote(subj, obj, "mapping", "file", vp)); 2419 } 2420 2421 return (0); 2422 } 2423 2424 static void 2425 lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp, 2426 struct label *vplabel, /* XXX vm_prot_t */ int *prot) 2427 { 2428 struct mac_lomac *subj, *obj; 2429 2430 /* 2431 * Rely on the use of open()-time protections to handle 2432 * non-revocation cases. 2433 */ 2434 if (!lomac_enabled || !revocation_enabled) 2435 return; 2436 2437 subj = SLOT(cred->cr_label); 2438 obj = SLOT(vplabel); 2439 2440 if (!lomac_subject_dominate(subj, obj)) 2441 *prot &= ~VM_PROT_WRITE; 2442 } 2443 2444 static int 2445 lomac_vnode_check_open(struct ucred *cred, struct vnode *vp, 2446 struct label *vplabel, accmode_t accmode) 2447 { 2448 struct mac_lomac *subj, *obj; 2449 2450 if (!lomac_enabled) 2451 return (0); 2452 2453 subj = SLOT(cred->cr_label); 2454 obj = SLOT(vplabel); 2455 2456 /* XXX privilege override for admin? */ 2457 if (accmode & VMODIFY_PERMS) { 2458 if (!lomac_subject_dominate(subj, obj)) 2459 return (EACCES); 2460 } 2461 2462 return (0); 2463 } 2464 2465 static int 2466 lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, 2467 struct vnode *vp, struct label *vplabel) 2468 { 2469 struct mac_lomac *subj, *obj; 2470 2471 if (!lomac_enabled || !revocation_enabled) 2472 return (0); 2473 2474 subj = SLOT(active_cred->cr_label); 2475 obj = SLOT(vplabel); 2476 2477 if (!lomac_dominate_single(obj, subj)) 2478 return (maybe_demote(subj, obj, "reading", "file", vp)); 2479 2480 return (0); 2481 } 2482 2483 static int 2484 lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp, 2485 struct label *vplabel, struct label *newlabel) 2486 { 2487 struct mac_lomac *old, *new, *subj; 2488 int error; 2489 2490 old = SLOT(vplabel); 2491 new = SLOT(newlabel); 2492 subj = SLOT(cred->cr_label); 2493 2494 /* 2495 * If there is a LOMAC label update for the vnode, it must be a 2496 * single label, with an optional explicit auxiliary single. 2497 */ 2498 error = lomac_atmostflags(new, 2499 MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX); 2500 if (error) 2501 return (error); 2502 2503 /* 2504 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must 2505 * authorize the relabel. 2506 */ 2507 if (!lomac_single_in_range(old, subj)) 2508 return (EPERM); 2509 2510 /* 2511 * If the LOMAC label is to be changed, authorize as appropriate. 2512 */ 2513 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { 2514 /* 2515 * To change the LOMAC label on a vnode, the new vnode label 2516 * must be in the subject range. 2517 */ 2518 if (!lomac_single_in_range(new, subj)) 2519 return (EPERM); 2520 2521 /* 2522 * To change the LOMAC label on the vnode to be EQUAL, the 2523 * subject must have appropriate privilege. 2524 */ 2525 if (lomac_contains_equal(new)) { 2526 error = lomac_subject_privileged(subj); 2527 if (error) 2528 return (error); 2529 } 2530 } 2531 if (new->ml_flags & MAC_LOMAC_FLAG_AUX) { 2532 /* 2533 * Fill in the missing parts from the previous label. 2534 */ 2535 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 2536 lomac_copy_single(subj, new); 2537 2538 /* 2539 * To change the auxiliary LOMAC label on a vnode, the new 2540 * vnode label must be in the subject range. 2541 */ 2542 if (!lomac_auxsingle_in_range(new, subj)) 2543 return (EPERM); 2544 2545 /* 2546 * To change the auxiliary LOMAC label on the vnode to be 2547 * EQUAL, the subject must have appropriate privilege. 2548 */ 2549 if (lomac_contains_equal(new)) { 2550 error = lomac_subject_privileged(subj); 2551 if (error) 2552 return (error); 2553 } 2554 } 2555 2556 return (0); 2557 } 2558 2559 static int 2560 lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, 2561 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2562 struct componentname *cnp) 2563 { 2564 struct mac_lomac *subj, *obj; 2565 2566 if (!lomac_enabled) 2567 return (0); 2568 2569 subj = SLOT(cred->cr_label); 2570 obj = SLOT(dvplabel); 2571 2572 if (!lomac_subject_dominate(subj, obj)) 2573 return (EACCES); 2574 2575 obj = SLOT(vplabel); 2576 2577 if (!lomac_subject_dominate(subj, obj)) 2578 return (EACCES); 2579 2580 return (0); 2581 } 2582 2583 static int 2584 lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, 2585 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2586 int samedir, struct componentname *cnp) 2587 { 2588 struct mac_lomac *subj, *obj; 2589 2590 if (!lomac_enabled) 2591 return (0); 2592 2593 subj = SLOT(cred->cr_label); 2594 obj = SLOT(dvplabel); 2595 2596 if (!lomac_subject_dominate(subj, obj)) 2597 return (EACCES); 2598 2599 if (vp != NULL) { 2600 obj = SLOT(vplabel); 2601 2602 if (!lomac_subject_dominate(subj, obj)) 2603 return (EACCES); 2604 } 2605 2606 return (0); 2607 } 2608 2609 static int 2610 lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp, 2611 struct label *vplabel) 2612 { 2613 struct mac_lomac *subj, *obj; 2614 2615 if (!lomac_enabled) 2616 return (0); 2617 2618 subj = SLOT(cred->cr_label); 2619 obj = SLOT(vplabel); 2620 2621 if (!lomac_subject_dominate(subj, obj)) 2622 return (EACCES); 2623 2624 return (0); 2625 } 2626 2627 static int 2628 lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, 2629 struct label *vplabel, acl_type_t type, struct acl *acl) 2630 { 2631 struct mac_lomac *subj, *obj; 2632 2633 if (!lomac_enabled) 2634 return (0); 2635 2636 subj = SLOT(cred->cr_label); 2637 obj = SLOT(vplabel); 2638 2639 if (!lomac_subject_dominate(subj, obj)) 2640 return (EACCES); 2641 2642 return (0); 2643 } 2644 2645 static int 2646 lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, 2647 struct label *vplabel, int attrnamespace, const char *name) 2648 { 2649 struct mac_lomac *subj, *obj; 2650 2651 if (!lomac_enabled) 2652 return (0); 2653 2654 subj = SLOT(cred->cr_label); 2655 obj = SLOT(vplabel); 2656 2657 if (!lomac_subject_dominate(subj, obj)) 2658 return (EACCES); 2659 2660 /* XXX: protect the MAC EA in a special way? */ 2661 2662 return (0); 2663 } 2664 2665 static int 2666 lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, 2667 struct label *vplabel, u_long flags) 2668 { 2669 struct mac_lomac *subj, *obj; 2670 2671 if (!lomac_enabled) 2672 return (0); 2673 2674 subj = SLOT(cred->cr_label); 2675 obj = SLOT(vplabel); 2676 2677 if (!lomac_subject_dominate(subj, obj)) 2678 return (EACCES); 2679 2680 return (0); 2681 } 2682 2683 static int 2684 lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, 2685 struct label *vplabel, mode_t mode) 2686 { 2687 struct mac_lomac *subj, *obj; 2688 2689 if (!lomac_enabled) 2690 return (0); 2691 2692 subj = SLOT(cred->cr_label); 2693 obj = SLOT(vplabel); 2694 2695 if (!lomac_subject_dominate(subj, obj)) 2696 return (EACCES); 2697 2698 return (0); 2699 } 2700 2701 static int 2702 lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, 2703 struct label *vplabel, uid_t uid, gid_t gid) 2704 { 2705 struct mac_lomac *subj, *obj; 2706 2707 if (!lomac_enabled) 2708 return (0); 2709 2710 subj = SLOT(cred->cr_label); 2711 obj = SLOT(vplabel); 2712 2713 if (!lomac_subject_dominate(subj, obj)) 2714 return (EACCES); 2715 2716 return (0); 2717 } 2718 2719 static int 2720 lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, 2721 struct label *vplabel, struct timespec atime, struct timespec mtime) 2722 { 2723 struct mac_lomac *subj, *obj; 2724 2725 if (!lomac_enabled) 2726 return (0); 2727 2728 subj = SLOT(cred->cr_label); 2729 obj = SLOT(vplabel); 2730 2731 if (!lomac_subject_dominate(subj, obj)) 2732 return (EACCES); 2733 2734 return (0); 2735 } 2736 2737 static int 2738 lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, 2739 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 2740 struct componentname *cnp) 2741 { 2742 struct mac_lomac *subj, *obj; 2743 2744 if (!lomac_enabled) 2745 return (0); 2746 2747 subj = SLOT(cred->cr_label); 2748 obj = SLOT(dvplabel); 2749 2750 if (!lomac_subject_dominate(subj, obj)) 2751 return (EACCES); 2752 2753 obj = SLOT(vplabel); 2754 2755 if (!lomac_subject_dominate(subj, obj)) 2756 return (EACCES); 2757 2758 return (0); 2759 } 2760 2761 static int 2762 lomac_vnode_check_write(struct ucred *active_cred, 2763 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 2764 { 2765 struct mac_lomac *subj, *obj; 2766 2767 if (!lomac_enabled || !revocation_enabled) 2768 return (0); 2769 2770 subj = SLOT(active_cred->cr_label); 2771 obj = SLOT(vplabel); 2772 2773 if (!lomac_subject_dominate(subj, obj)) 2774 return (EACCES); 2775 2776 return (0); 2777 } 2778 2779 static int 2780 lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp, 2781 struct label *mplabel, struct vnode *dvp, struct label *dvplabel, 2782 struct vnode *vp, struct label *vplabel, struct componentname *cnp) 2783 { 2784 struct mac_lomac *source, *dest, *dir, temp; 2785 size_t buflen; 2786 int error; 2787 2788 buflen = sizeof(temp); 2789 bzero(&temp, buflen); 2790 2791 source = SLOT(cred->cr_label); 2792 dest = SLOT(vplabel); 2793 dir = SLOT(dvplabel); 2794 if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) { 2795 lomac_copy_auxsingle(dir, &temp); 2796 lomac_set_single(&temp, dir->ml_auxsingle.mle_type, 2797 dir->ml_auxsingle.mle_grade); 2798 } else { 2799 lomac_copy_single(source, &temp); 2800 } 2801 2802 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2803 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); 2804 if (error == 0) 2805 lomac_copy(&temp, dest); 2806 return (error); 2807 } 2808 2809 static void 2810 lomac_vnode_execve_transition(struct ucred *old, struct ucred *new, 2811 struct vnode *vp, struct label *vplabel, struct label *interpvplabel, 2812 struct image_params *imgp, struct label *execlabel) 2813 { 2814 struct mac_lomac *source, *dest, *obj, *robj; 2815 2816 source = SLOT(old->cr_label); 2817 dest = SLOT(new->cr_label); 2818 obj = SLOT(vplabel); 2819 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; 2820 2821 lomac_copy(source, dest); 2822 /* 2823 * If there's an auxiliary label on the real object, respect it and 2824 * assume that this level should be assumed immediately if a higher 2825 * level is currently in place. 2826 */ 2827 if (robj->ml_flags & MAC_LOMAC_FLAG_AUX && 2828 !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single) 2829 && lomac_auxsingle_in_range(robj, dest)) 2830 lomac_set_single(dest, robj->ml_auxsingle.mle_type, 2831 robj->ml_auxsingle.mle_grade); 2832 /* 2833 * Restructuring to use the execve transitioning mechanism instead of 2834 * the normal demotion mechanism here would be difficult, so just 2835 * copy the label over and perform standard demotion. This is also 2836 * non-optimal because it will result in the intermediate label "new" 2837 * being created and immediately recycled. 2838 */ 2839 if (lomac_enabled && revocation_enabled && 2840 !lomac_dominate_single(obj, source)) 2841 (void)maybe_demote(source, obj, "executing", "file", vp); 2842 } 2843 2844 static int 2845 lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp, 2846 struct label *vplabel, struct label *interpvplabel, 2847 struct image_params *imgp, struct label *execlabel) 2848 { 2849 struct mac_lomac *subj, *obj, *robj; 2850 2851 if (!lomac_enabled || !revocation_enabled) 2852 return (0); 2853 2854 subj = SLOT(old->cr_label); 2855 obj = SLOT(vplabel); 2856 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; 2857 2858 return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX && 2859 !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single) 2860 && lomac_auxsingle_in_range(robj, subj)) || 2861 !lomac_dominate_single(obj, subj)); 2862 } 2863 2864 static void 2865 lomac_vnode_relabel(struct ucred *cred, struct vnode *vp, 2866 struct label *vplabel, struct label *newlabel) 2867 { 2868 struct mac_lomac *source, *dest; 2869 2870 source = SLOT(newlabel); 2871 dest = SLOT(vplabel); 2872 2873 try_relabel(source, dest); 2874 } 2875 2876 static int 2877 lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, 2878 struct label *vplabel, struct label *intlabel) 2879 { 2880 struct mac_lomac *source, temp; 2881 size_t buflen; 2882 int error; 2883 2884 buflen = sizeof(temp); 2885 bzero(&temp, buflen); 2886 2887 source = SLOT(intlabel); 2888 if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) 2889 return (0); 2890 2891 lomac_copy_single(source, &temp); 2892 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, 2893 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); 2894 return (error); 2895 } 2896 2897 static struct mac_policy_ops lomac_ops = 2898 { 2899 .mpo_init = lomac_init, 2900 2901 .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive, 2902 .mpo_bpfdesc_create = lomac_bpfdesc_create, 2903 .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf, 2904 .mpo_bpfdesc_destroy_label = lomac_destroy_label, 2905 .mpo_bpfdesc_init_label = lomac_init_label, 2906 2907 .mpo_cred_check_relabel = lomac_cred_check_relabel, 2908 .mpo_cred_check_visible = lomac_cred_check_visible, 2909 .mpo_cred_copy_label = lomac_copy_label, 2910 .mpo_cred_create_swapper = lomac_cred_create_swapper, 2911 .mpo_cred_create_init = lomac_cred_create_init, 2912 .mpo_cred_destroy_label = lomac_destroy_label, 2913 .mpo_cred_externalize_label = lomac_externalize_label, 2914 .mpo_cred_init_label = lomac_init_label, 2915 .mpo_cred_internalize_label = lomac_internalize_label, 2916 .mpo_cred_relabel = lomac_cred_relabel, 2917 2918 .mpo_devfs_create_device = lomac_devfs_create_device, 2919 .mpo_devfs_create_directory = lomac_devfs_create_directory, 2920 .mpo_devfs_create_symlink = lomac_devfs_create_symlink, 2921 .mpo_devfs_destroy_label = lomac_destroy_label, 2922 .mpo_devfs_init_label = lomac_init_label, 2923 .mpo_devfs_update = lomac_devfs_update, 2924 .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate, 2925 2926 .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel, 2927 .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit, 2928 .mpo_ifnet_copy_label = lomac_copy_label, 2929 .mpo_ifnet_create = lomac_ifnet_create, 2930 .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf, 2931 .mpo_ifnet_destroy_label = lomac_destroy_label, 2932 .mpo_ifnet_externalize_label = lomac_externalize_label, 2933 .mpo_ifnet_init_label = lomac_init_label, 2934 .mpo_ifnet_internalize_label = lomac_internalize_label, 2935 .mpo_ifnet_relabel = lomac_ifnet_relabel, 2936 2937 .mpo_syncache_create = lomac_syncache_create, 2938 .mpo_syncache_destroy_label = lomac_destroy_label, 2939 .mpo_syncache_init_label = lomac_init_label_waitcheck, 2940 2941 .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver, 2942 .mpo_inpcb_check_visible = lomac_inpcb_check_visible, 2943 .mpo_inpcb_create = lomac_inpcb_create, 2944 .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf, 2945 .mpo_inpcb_destroy_label = lomac_destroy_label, 2946 .mpo_inpcb_init_label = lomac_init_label_waitcheck, 2947 .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel, 2948 2949 .mpo_ip6q_create = lomac_ip6q_create, 2950 .mpo_ip6q_destroy_label = lomac_destroy_label, 2951 .mpo_ip6q_init_label = lomac_init_label_waitcheck, 2952 .mpo_ip6q_match = lomac_ip6q_match, 2953 .mpo_ip6q_reassemble = lomac_ip6q_reassemble, 2954 .mpo_ip6q_update = lomac_ip6q_update, 2955 2956 .mpo_ipq_create = lomac_ipq_create, 2957 .mpo_ipq_destroy_label = lomac_destroy_label, 2958 .mpo_ipq_init_label = lomac_init_label_waitcheck, 2959 .mpo_ipq_match = lomac_ipq_match, 2960 .mpo_ipq_reassemble = lomac_ipq_reassemble, 2961 .mpo_ipq_update = lomac_ipq_update, 2962 2963 .mpo_kld_check_load = lomac_kld_check_load, 2964 2965 .mpo_mbuf_copy_label = lomac_copy_label, 2966 .mpo_mbuf_destroy_label = lomac_destroy_label, 2967 .mpo_mbuf_init_label = lomac_init_label_waitcheck, 2968 2969 .mpo_mount_create = lomac_mount_create, 2970 .mpo_mount_destroy_label = lomac_destroy_label, 2971 .mpo_mount_init_label = lomac_init_label, 2972 2973 .mpo_netinet_arp_send = lomac_netinet_arp_send, 2974 .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply, 2975 .mpo_netinet_firewall_send = lomac_netinet_firewall_send, 2976 .mpo_netinet_fragment = lomac_netinet_fragment, 2977 .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply, 2978 .mpo_netinet_igmp_send = lomac_netinet_igmp_send, 2979 2980 .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send, 2981 2982 .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl, 2983 .mpo_pipe_check_read = lomac_pipe_check_read, 2984 .mpo_pipe_check_relabel = lomac_pipe_check_relabel, 2985 .mpo_pipe_check_write = lomac_pipe_check_write, 2986 .mpo_pipe_copy_label = lomac_copy_label, 2987 .mpo_pipe_create = lomac_pipe_create, 2988 .mpo_pipe_destroy_label = lomac_destroy_label, 2989 .mpo_pipe_externalize_label = lomac_externalize_label, 2990 .mpo_pipe_init_label = lomac_init_label, 2991 .mpo_pipe_internalize_label = lomac_internalize_label, 2992 .mpo_pipe_relabel = lomac_pipe_relabel, 2993 2994 .mpo_priv_check = lomac_priv_check, 2995 2996 .mpo_proc_check_debug = lomac_proc_check_debug, 2997 .mpo_proc_check_sched = lomac_proc_check_sched, 2998 .mpo_proc_check_signal = lomac_proc_check_signal, 2999 .mpo_proc_destroy_label = lomac_proc_destroy_label, 3000 .mpo_proc_init_label = lomac_proc_init_label, 3001 3002 .mpo_socket_check_deliver = lomac_socket_check_deliver, 3003 .mpo_socket_check_relabel = lomac_socket_check_relabel, 3004 .mpo_socket_check_visible = lomac_socket_check_visible, 3005 .mpo_socket_copy_label = lomac_copy_label, 3006 .mpo_socket_create = lomac_socket_create, 3007 .mpo_socket_create_mbuf = lomac_socket_create_mbuf, 3008 .mpo_socket_destroy_label = lomac_destroy_label, 3009 .mpo_socket_externalize_label = lomac_externalize_label, 3010 .mpo_socket_init_label = lomac_init_label_waitcheck, 3011 .mpo_socket_internalize_label = lomac_internalize_label, 3012 .mpo_socket_newconn = lomac_socket_newconn, 3013 .mpo_socket_relabel = lomac_socket_relabel, 3014 3015 .mpo_socketpeer_destroy_label = lomac_destroy_label, 3016 .mpo_socketpeer_externalize_label = lomac_externalize_label, 3017 .mpo_socketpeer_init_label = lomac_init_label_waitcheck, 3018 .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf, 3019 .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket, 3020 3021 .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf, 3022 3023 .mpo_system_check_acct = lomac_system_check_acct, 3024 .mpo_system_check_auditctl = lomac_system_check_auditctl, 3025 .mpo_system_check_swapoff = lomac_system_check_swapoff, 3026 .mpo_system_check_swapon = lomac_system_check_swapon, 3027 .mpo_system_check_sysctl = lomac_system_check_sysctl, 3028 3029 .mpo_thread_userret = lomac_thread_userret, 3030 3031 .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr, 3032 .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel, 3033 .mpo_vnode_check_access = lomac_vnode_check_open, 3034 .mpo_vnode_check_create = lomac_vnode_check_create, 3035 .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl, 3036 .mpo_vnode_check_link = lomac_vnode_check_link, 3037 .mpo_vnode_check_mmap = lomac_vnode_check_mmap, 3038 .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade, 3039 .mpo_vnode_check_open = lomac_vnode_check_open, 3040 .mpo_vnode_check_read = lomac_vnode_check_read, 3041 .mpo_vnode_check_relabel = lomac_vnode_check_relabel, 3042 .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from, 3043 .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to, 3044 .mpo_vnode_check_revoke = lomac_vnode_check_revoke, 3045 .mpo_vnode_check_setacl = lomac_vnode_check_setacl, 3046 .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr, 3047 .mpo_vnode_check_setflags = lomac_vnode_check_setflags, 3048 .mpo_vnode_check_setmode = lomac_vnode_check_setmode, 3049 .mpo_vnode_check_setowner = lomac_vnode_check_setowner, 3050 .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes, 3051 .mpo_vnode_check_unlink = lomac_vnode_check_unlink, 3052 .mpo_vnode_check_write = lomac_vnode_check_write, 3053 .mpo_vnode_copy_label = lomac_copy_label, 3054 .mpo_vnode_create_extattr = lomac_vnode_create_extattr, 3055 .mpo_vnode_destroy_label = lomac_destroy_label, 3056 .mpo_vnode_execve_transition = lomac_vnode_execve_transition, 3057 .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition, 3058 .mpo_vnode_externalize_label = lomac_externalize_label, 3059 .mpo_vnode_init_label = lomac_init_label, 3060 .mpo_vnode_internalize_label = lomac_internalize_label, 3061 .mpo_vnode_relabel = lomac_vnode_relabel, 3062 .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr, 3063 }; 3064 3065 MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC", 3066 MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot);

Cache object: b96db58ee4338a7b28cc4dbcc8ef0e6a

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

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