kern_auth.c revision 1.1.2.15
1 /* $NetBSD: kern_auth.c,v 1.1.2.15 2006/03/11 03:21:16 elad Exp $ */ 2 3 /*- 4 * Copyright (c) 2005, 2006 Elad Efrat <elad (at) NetBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Elad Efrat. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Todo: 35 * - Garbage collection to pool_put() unused scopes/listeners. 36 */ 37 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <sys/queue.h> 41 #include <sys/time.h> 42 #include <sys/proc.h> 43 #include <sys/ucred.h> 44 #include <sys/pool.h> 45 #include <sys/kauth.h> 46 #include <sys/acct.h> 47 48 /* 49 * Credentials. 50 */ 51 struct kauth_cred { 52 struct simplelock cr_lock; /* lock */ 53 uint32_t cr_refcnt; /* reference count */ 54 uid_t cr_uid; /* user id */ 55 uid_t cr_euid; /* effective user id */ 56 uid_t cr_svuid; /* saved effective user id */ 57 gid_t cr_gid; /* group id */ 58 gid_t cr_egid; /* effective group id */ 59 gid_t cr_svgid; /* saved effective group id */ 60 uint16_t cr_ngroups; /* number of groups */ 61 gid_t cr_groups[NGROUPS]; /* group memberships */ 62 }; 63 64 /* 65 * Listener. 66 */ 67 struct kauth_listener { 68 kauth_scope_callback_t func; /* callback */ 69 kauth_scope_t scope; /* scope backpointer */ 70 uint32_t refcnt; /* reference count */ 71 SIMPLEQ_ENTRY(kauth_listener) listener_next; /* listener list */ 72 }; 73 74 /* 75 * Scope. 76 */ 77 struct kauth_scope { 78 const char *id; /* scope name */ 79 void *cookie; /* user cookie */ 80 uint32_t nlisteners; /* # of listeners */ 81 SIMPLEQ_HEAD(, kauth_listener) listenq; /* listener list */ 82 SIMPLEQ_ENTRY(kauth_scope) next_scope; /* scope list */ 83 }; 84 85 POOL_INIT(kauth_scope_pool, sizeof(struct kauth_scope), 0, 0, 0, 86 "kauth_scopepl", &pool_allocator_nointr); 87 POOL_INIT(kauth_listener_pool, sizeof(struct kauth_listener), 0, 0, 0, 88 "kauth_listenerpl", &pool_allocator_nointr); 89 POOL_INIT(kauth_cred_pool, sizeof(struct kauth_cred), 0, 0, 0, 90 "kauth_credpl", &pool_allocator_nointr); 91 92 /* List of scopes and its lock. */ 93 SIMPLEQ_HEAD(, kauth_scope) scope_list; 94 struct simplelock scopes_lock; 95 96 /* Built-in scopes: generic, process. */ 97 static kauth_scope_t kauth_builtin_scope_generic; 98 static kauth_scope_t kauth_builtin_scope_process; 99 100 /* Allocate new, empty kauth credentials. */ 101 kauth_cred_t 102 kauth_cred_alloc(void) { 103 kauth_cred_t cred; 104 105 cred = pool_get(&kauth_cred_pool, PR_WAITOK); 106 memset(cred, 0, sizeof(*cred)); 107 simple_lock_init(&cred->cr_lock); 108 cred->cr_refcnt = 1; 109 110 return (cred); 111 } 112 113 /* Increment reference count to cred. */ 114 void 115 kauth_cred_hold(kauth_cred_t cred) 116 { 117 KASSERT(cred != NULL); 118 119 simple_lock(&cred->cr_lock); 120 cred->cr_refcnt++; 121 simple_unlock(&cred->cr_lock); 122 } 123 124 void 125 kauth_cred_destroy(kauth_cred_t cred) 126 { 127 KASSERT(cred != NULL); 128 129 pool_put(&kauth_cred_pool, cred); 130 } 131 132 /* Decrease reference count to cred. If reached zero, free it. */ 133 void 134 kauth_cred_free(kauth_cred_t cred) { 135 KASSERT(cred != NULL); 136 137 simple_lock(&cred->cr_lock); 138 cred->cr_refcnt--; 139 simple_unlock(&cred->cr_lock); 140 141 if (cred->cr_refcnt == 0) 142 kauth_cred_destroy(cred); 143 } 144 145 void 146 kauth_cred_clone(kauth_cred_t from, kauth_cred_t to) 147 { 148 KASSERT(from != NULL); 149 KASSERT(to != NULL); 150 151 to->cr_uid = from->cr_uid; 152 to->cr_euid = from->cr_euid; 153 to->cr_svuid = from->cr_svuid; 154 to->cr_gid = from->cr_gid; 155 to->cr_egid = from->cr_egid; 156 to->cr_svgid = from->cr_svgid; 157 to->cr_ngroups = from->cr_ngroups; 158 memcpy(to->cr_groups, from->cr_groups, 159 sizeof(to->cr_groups)); 160 } 161 162 /* 163 * Duplicate cred and return a new kauth_cred_t. 164 */ 165 kauth_cred_t 166 kauth_cred_dup(kauth_cred_t cred) 167 { 168 kauth_cred_t new_cred; 169 170 KASSERT(cred != NULL); 171 172 new_cred = kauth_cred_alloc(); 173 174 kauth_cred_clone(cred, new_cred); 175 176 return (new_cred); 177 } 178 179 /* 180 * Similar to crcopy(), only on a kauth_cred_t. 181 * XXX: Is this even needed? [kauth_cred_copy] 182 */ 183 kauth_cred_t 184 kauth_cred_copy(kauth_cred_t cred) 185 { 186 kauth_cred_t new_cred; 187 188 KASSERT(cred != NULL); 189 190 /* If the provided credentials already have one reference, use them. */ 191 if (cred->cr_refcnt == 1) 192 return (cred); 193 194 new_cred = kauth_cred_alloc(); 195 196 kauth_cred_clone(cred, new_cred); 197 198 kauth_cred_free(cred); 199 200 return (new_cred); 201 } 202 203 uid_t 204 kauth_cred_getuid(kauth_cred_t cred) 205 { 206 KASSERT(cred != NULL); 207 208 return (cred->cr_uid); 209 } 210 211 uid_t 212 kauth_cred_geteuid(kauth_cred_t cred) 213 { 214 KASSERT(cred != NULL); 215 216 return (cred->cr_euid); 217 } 218 219 uid_t 220 kauth_cred_getsvuid(kauth_cred_t cred) 221 { 222 KASSERT(cred != NULL); 223 224 return (cred->cr_svuid); 225 } 226 227 gid_t 228 kauth_cred_getgid(kauth_cred_t cred) 229 { 230 KASSERT(cred != NULL); 231 232 return (cred->cr_gid); 233 } 234 235 gid_t 236 kauth_cred_getegid(kauth_cred_t cred) 237 { 238 KASSERT(cred != NULL); 239 240 return (cred->cr_egid); 241 } 242 243 gid_t 244 kauth_cred_getsvgid(kauth_cred_t cred) 245 { 246 KASSERT(cred != NULL); 247 248 return (cred->cr_svgid); 249 } 250 251 void 252 kauth_cred_setuid(kauth_cred_t cred, uid_t uid) 253 { 254 KASSERT(cred != NULL); 255 KASSERT(uid >= 0 && uid <= UID_MAX); 256 257 cred->cr_uid = uid; 258 } 259 260 void 261 kauth_cred_seteuid(kauth_cred_t cred, uid_t uid) 262 { 263 KASSERT(cred != NULL); 264 KASSERT(uid >= 0 && uid <= UID_MAX); 265 266 cred->cr_euid = uid; 267 } 268 269 void 270 kauth_cred_setsvuid(kauth_cred_t cred, uid_t uid) 271 { 272 KASSERT(cred != NULL); 273 KASSERT(uid >= 0 && uid <= UID_MAX); 274 275 cred->cr_svuid = uid; 276 } 277 278 void 279 kauth_cred_setgid(kauth_cred_t cred, gid_t gid) 280 { 281 KASSERT(cred != NULL); 282 KASSERT(gid >= 0 && gid <= GID_MAX); 283 284 cred->cr_gid = gid; 285 } 286 287 void 288 kauth_cred_setegid(kauth_cred_t cred, gid_t gid) 289 { 290 KASSERT(cred != NULL); 291 KASSERT(gid >= 0 && gid <= GID_MAX); 292 293 cred->cr_egid = gid; 294 } 295 296 void 297 kauth_cred_setsvgid(kauth_cred_t cred, gid_t gid) 298 { 299 KASSERT(cred != NULL); 300 KASSERT(gid >= 0 && gid <= GID_MAX); 301 302 cred->cr_svgid = gid; 303 } 304 305 /* Checks if gid is a member of the groups in cred. */ 306 int 307 kauth_cred_groupmember(kauth_cred_t cred, gid_t gid) 308 { 309 int i; 310 311 KASSERT(cred != NULL); 312 KASSERT(gid >= 0 && gid <= GID_MAX); 313 314 for (i = 0; i < cred->cr_ngroups; i++) { 315 if (cred->cr_groups[i] == gid) 316 return (1); 317 } 318 319 return (0); 320 } 321 322 uint16_t 323 kauth_cred_ngroups(kauth_cred_t cred) 324 { 325 KASSERT(cred != NULL); 326 327 return (cred->cr_ngroups); 328 } 329 330 /* 331 * Return the group at index idx from the groups in cred. 332 */ 333 gid_t 334 kauth_cred_group(kauth_cred_t cred, uint16_t idx) 335 { 336 KASSERT(cred != NULL); 337 KASSERT(idx < cred->cr_ngroups); 338 339 return (cred->cr_groups[idx]); 340 } 341 342 /* Sort len groups in grbuf. */ 343 static void 344 kauth_cred_sortgroups(gid_t *grbuf, size_t len) 345 { 346 int i, j; 347 gid_t v; 348 349 KASSERT(grbuf != NULL); 350 351 /* Insertion sort. */ 352 for (i = 1; i < len; i++) { 353 v = grbuf[i]; 354 /* find correct slot for value v, moving others up */ 355 for (j = i; --j >= 0 && v < grbuf[j];) 356 grbuf[j + 1] = grbuf[j]; 357 grbuf[j + 1] = v; 358 } 359 } 360 361 /* Add group gid to groups in cred. Maintain order. */ 362 int 363 kauth_cred_addgroup(kauth_cred_t cred, gid_t gid) 364 { 365 KASSERT(cred != NULL); 366 KASSERT(gid >= 0 && gid <= GID_MAX); 367 368 simple_lock(&cred->cr_lock); 369 370 if (cred->cr_ngroups >= 371 (sizeof(cred->cr_groups) / sizeof(cred->cr_groups[0]))) { 372 simple_unlock(&cred->cr_lock); 373 return (E2BIG); 374 } 375 376 if (kauth_cred_groupmember(cred, gid)) { 377 simple_unlock(&cred->cr_lock); 378 return (0); 379 } 380 381 cred->cr_groups[cred->cr_ngroups++] = gid; 382 383 kauth_cred_sortgroups(cred->cr_groups, cred->cr_ngroups); 384 385 simple_unlock(&cred->cr_lock); 386 387 return (0); 388 } 389 390 /* Delete group gid from groups in cred. Maintain order. */ 391 int 392 kauth_cred_delgroup(kauth_cred_t cred, gid_t gid) 393 { 394 KASSERT(cred != NULL); 395 KASSERT(gid >= 0 && gid <= GID_MAX); 396 397 simple_lock(&cred->cr_lock); 398 399 if (!kauth_cred_groupmember(cred, gid)) { 400 simple_unlock(&cred->cr_lock); 401 return (0); 402 } 403 404 if (cred->cr_ngroups == 1) 405 cred->cr_groups[0] = (gid_t)-1; /* XXX */ 406 else { 407 int i; 408 409 for (i = 0; i < cred->cr_ngroups; i++) 410 if (cred->cr_groups[i] == gid) { 411 cred->cr_groups[i] = cred->cr_groups[cred->cr_ngroups - 1]; 412 cred->cr_groups[cred->cr_ngroups - 1] = (gid_t)-1; /* XXX */ 413 } 414 } 415 416 cred->cr_ngroups--; 417 418 kauth_cred_sortgroups(cred->cr_groups, cred->cr_ngroups); 419 420 simple_unlock(&cred->cr_lock); 421 422 return (0); 423 } 424 425 /* 426 * Match uids in two credentials. Checks if cred1 can access stuff owned by 427 * cred2. 428 * XXX: root bypasses this! 429 */ 430 int 431 kauth_cred_uidmatch(kauth_cred_t cred1, kauth_cred_t cred2) 432 { 433 KASSERT(cred1 != NULL); 434 KASSERT(cred2 != NULL); 435 436 /* Are we root? */ 437 if (cred1->cr_euid == 0) 438 return (1); 439 440 if (cred1->cr_uid == cred2->cr_uid || 441 cred1->cr_euid == cred2->cr_uid || 442 cred1->cr_uid == cred2->cr_euid || 443 cred1->cr_euid == cred2->cr_euid) 444 return (1); 445 446 return (0); 447 } 448 449 uint32_t 450 kauth_cred_getrefcnt(kauth_cred_t cred) 451 { 452 KASSERT(cred != NULL); 453 454 return (cred->cr_refcnt); 455 } 456 457 /* XXX: memcmp() wrapper needed for NFSW_SAMECRED() in nfs/nfs.h */ 458 int 459 kauth_cred_memcmp(kauth_cred_t cred1, kauth_cred_t cred2) 460 { 461 KASSERT(cred1 != NULL); 462 KASSERT(cred2 != NULL); 463 464 return (memcmp(cred1, cred2, sizeof(*cred1))); 465 } 466 467 /* 468 * Convert userland credentials (struct uucred) to kauth_cred_t. 469 * XXX: For NFS code. 470 */ 471 void 472 kauth_cred_convert(kauth_cred_t cred, const struct uucred *uuc) 473 { 474 int i; 475 476 KASSERT(cred != NULL); 477 KASSERT(uuc != NULL); 478 479 cred->cr_refcnt = 1; 480 cred->cr_euid = uuc->cr_uid; 481 cred->cr_egid = uuc->cr_gid; 482 cred->cr_ngroups = min(uuc->cr_ngroups, NGROUPS); 483 for (i = 0; i < cred->cr_ngroups; i++) 484 kauth_cred_addgroup(cred, uuc->cr_groups[i]); 485 } 486 487 /* 488 * Compare kauth_cred_t and uucred credentials. 489 * XXX: Modelled after crcmp() for NFS. 490 */ 491 int 492 kauth_cred_compare(kauth_cred_t cred, const struct uucred *uuc) 493 { 494 KASSERT(cred != NULL); 495 KASSERT(uuc != NULL); 496 497 if (cred->cr_euid == uuc->cr_uid && 498 cred->cr_egid == uuc->cr_gid && 499 cred->cr_ngroups == uuc->cr_ngroups && 500 !memcmp(cred->cr_groups, uuc->cr_groups, 501 cred->cr_ngroups * sizeof(cred->cr_groups[0]))) 502 return (1); 503 504 return (0); 505 } 506 507 /* 508 * Make a struct ucred out of a kauth_cred_t. 509 * XXX: For sysctl. 510 */ 511 void 512 kauth_cred_toucred(kauth_cred_t cred, struct ucred *uc) 513 { 514 KASSERT(cred != NULL); 515 KASSERT(uc != NULL); 516 517 uc->cr_uid = cred->cr_euid; 518 uc->cr_gid = cred->cr_egid; 519 uc->cr_ngroups = min(cred->cr_ngroups, 520 sizeof(uc->cr_groups) / sizeof(uc->cr_groups[0])); 521 memcpy(uc->cr_groups, cred->cr_groups, 522 uc->cr_ngroups * sizeof(uc->cr_groups[0])); 523 } 524 525 /* 526 * Make a struct pcred out of a kauth_cred_t. 527 * XXX: For sysctl. 528 */ 529 void 530 kauth_cred_topcred(kauth_cred_t cred, struct pcred *pc) 531 { 532 KASSERT(cred != NULL); 533 KASSERT(pc != NULL); 534 535 pc->pc_ucred = (struct ucred *)cred; /* XXX this is just wrong */ 536 pc->p_ruid = cred->cr_uid; 537 pc->p_svuid = cred->cr_svuid; 538 pc->p_rgid = cred->cr_gid; 539 pc->p_svgid = cred->cr_svgid; 540 pc->p_refcnt = cred->cr_refcnt; 541 } 542 543 /* 544 * Return kauth_cred_t for the current process. 545 */ 546 kauth_cred_t 547 kauth_cred_get(void) 548 { 549 return (curproc->p_cred); 550 } 551 552 /* 553 * Returns a scope matching the provided id. 554 * Requires the scope list lock to be held by the caller. 555 */ 556 static kauth_scope_t 557 kauth_ifindscope(const char *id) { 558 kauth_scope_t scope; 559 560 /* XXX: assert lock on scope list? */ 561 562 scope = NULL; 563 SIMPLEQ_FOREACH(scope, &scope_list, next_scope) { 564 if (strcmp(scope->id, id) == 0) 565 break; 566 } 567 568 return (scope); 569 } 570 571 /* 572 * Register a new scope. 573 * 574 * id - identifier for the scope 575 * callback - the scope's default listener 576 * cookie - cookie to be passed to the listener(s) 577 */ 578 kauth_scope_t 579 kauth_register_scope(const char *id, kauth_scope_callback_t callback, 580 void *cookie) 581 { 582 kauth_scope_t scope; 583 kauth_listener_t listener; 584 585 /* Sanitize input */ 586 if (id == NULL || callback == NULL) 587 return (NULL); 588 589 /* Allocate space for a new scope and listener. */ 590 scope = pool_get(&kauth_scope_pool, PR_WAITOK); 591 listener = pool_get(&kauth_listener_pool, PR_WAITOK); 592 593 /* Acquire scope list lock. */ 594 simple_lock(&scopes_lock); 595 596 /* Check we don't already have a scope with the same id */ 597 if (kauth_ifindscope(id) != NULL) { 598 simple_unlock(&scopes_lock); 599 600 pool_put(&kauth_scope_pool, scope); 601 pool_put(&kauth_listener_pool, listener); 602 603 return (NULL); 604 } 605 606 /* Initialize new scope with parameters */ 607 scope->id = id; 608 scope->cookie = cookie; 609 scope->nlisteners = 1; 610 611 /* Add default listener */ 612 listener->func = callback; 613 listener->scope = scope; 614 listener->refcnt = 0; 615 SIMPLEQ_INIT(&scope->listenq); 616 SIMPLEQ_INSERT_HEAD(&scope->listenq, listener, listener_next); 617 618 /* Insert scope to scopes list */ 619 if (SIMPLEQ_EMPTY(&scope_list)) 620 SIMPLEQ_INSERT_HEAD(&scope_list, scope, next_scope); 621 else 622 SIMPLEQ_INSERT_TAIL(&scope_list, scope, next_scope); 623 624 simple_unlock(&scopes_lock); 625 626 return (scope); 627 } 628 629 /* 630 * Initialize the kernel authorization subsystem. 631 * 632 * Initialize the scopes list lock. 633 * Register built-in scopes: generic, process. 634 */ 635 void 636 kauth_init(void) 637 { 638 simple_lock_init(&scopes_lock); 639 640 /* Register generic scope. */ 641 kauth_builtin_scope_generic = kauth_register_scope(KAUTH_SCOPE_GENERIC, 642 kauth_authorize_cb_generic, NULL); 643 644 /* Register process scope. */ 645 kauth_builtin_scope_process = kauth_register_scope(KAUTH_SCOPE_PROCESS, 646 kauth_authorize_cb_process, NULL); 647 } 648 649 /* 650 * Deregister a scope. 651 * Requires scope list lock to be held by the caller. 652 * 653 * scope - the scope to deregister 654 */ 655 void 656 kauth_deregister_scope(kauth_scope_t scope) 657 { 658 if (scope != NULL) { 659 /* Remove scope from list */ 660 SIMPLEQ_REMOVE(&scope_list, scope, kauth_scope, next_scope); 661 } 662 } 663 664 /* 665 * Register a listener. 666 * 667 * id - scope identifier. 668 * callback - the callback routine for the listener. 669 * cookie - cookie to pass unmoidfied to the callback. 670 */ 671 kauth_listener_t 672 kauth_listen_scope(const char *id, kauth_scope_callback_t callback, 673 void *cookie) 674 { 675 kauth_scope_t scope; 676 kauth_listener_t listener; 677 678 /* Find scope struct */ 679 simple_lock(&scopes_lock); 680 scope = kauth_ifindscope(id); 681 simple_unlock(&scopes_lock); 682 if (scope == NULL) 683 return (NULL); 684 685 /* Allocate listener */ 686 listener = pool_get(&kauth_listener_pool, PR_WAITOK); 687 688 /* Initialize listener with parameters */ 689 listener->func = callback; 690 listener->refcnt = 0; 691 692 /* Add listener to scope */ 693 SIMPLEQ_INSERT_TAIL(&scope->listenq, listener, listener_next); 694 695 /* Raise number of listeners on scope. */ 696 scope->nlisteners++; 697 listener->scope = scope; 698 699 return (listener); 700 } 701 702 /* 703 * Deregister a listener. 704 * 705 * listener - listener reference as returned from kauth_listen_scope(). 706 */ 707 void 708 kauth_unlisten_scope(kauth_listener_t listener) 709 { 710 if (listener != NULL) { 711 SIMPLEQ_REMOVE(&listener->scope->listenq, listener, kauth_listener, 712 listener_next); 713 listener->scope->nlisteners--; 714 } 715 } 716 717 /* 718 * Authorize a request. 719 * 720 * scope - the scope of the request as defined by KAUTH_SCOPE_* or as 721 * returned from kauth_register_scope(). 722 * credential - credentials of the user ("actor") making the request. 723 * action - request identifier. 724 * arg[0-3] - passed unmodified to listener(s). 725 */ 726 int 727 kauth_authorize_action(kauth_scope_t scope, kauth_cred_t cred, 728 kauth_action_t action, void *arg0, void *arg1, 729 void *arg2, void *arg3) 730 { 731 kauth_listener_t listener; 732 int error, allow, fail; 733 734 /* Sanitize input */ 735 if (scope == NULL || cred == NULL) 736 return (EFAULT); 737 if (!action) 738 return (EINVAL); 739 740 /* 741 * Each scope is associated with at least one listener. We need to 742 * traverse that list of listeners, as long as they return either 743 * KAUTH_REQUEST_DEFER or KAUTH_REQUEST_ALLOW. 744 */ 745 fail = 0; 746 allow = 0; 747 SIMPLEQ_FOREACH(listener, &scope->listenq, listener_next) { 748 error = listener->func(cred, action, scope->cookie, arg0, 749 arg1, arg2, arg3); 750 751 if (error == KAUTH_RESULT_ALLOW) 752 allow = 1; 753 else if (error == KAUTH_RESULT_DENY) 754 fail = 1; 755 } 756 757 return ((allow && !fail) ? 0 : EPERM); 758 }; 759 760 /* 761 * Generic scope default callback. 762 */ 763 int 764 kauth_authorize_cb_generic(kauth_cred_t cred, kauth_action_t action, 765 void *cookie, void *arg0, void *arg1, void *arg2, 766 void *arg3) 767 { 768 int error; 769 770 error = KAUTH_RESULT_DEFER; 771 772 switch (action) { 773 case KAUTH_GENERIC_ISSUSER: 774 /* Check if credential belongs to superuser. */ 775 if (cred->cr_euid == 0) { 776 u_short *acflag = (u_short *)arg0; 777 778 if (acflag != NULL) 779 *acflag |= ASU; 780 781 error = KAUTH_RESULT_ALLOW; 782 } else 783 error = KAUTH_RESULT_DENY; 784 break; 785 } 786 787 return (error); 788 } 789 790 /* 791 * Generic scope authorization wrapper. 792 */ 793 int 794 kauth_authorize_generic(kauth_cred_t cred, kauth_action_t action, void *arg0) 795 { 796 return (kauth_authorize_action(kauth_builtin_scope_generic, cred, 797 action, arg0, NULL, NULL, NULL)); 798 } 799 800 /* 801 * Process scope default callback. 802 */ 803 int 804 kauth_authorize_cb_process(kauth_cred_t cred, kauth_action_t action, 805 void *cookie, void *arg0, void *arg1, void *arg2, 806 void *arg3) 807 { 808 struct proc *p; 809 kauth_cred_t cred2; 810 int error; 811 812 error = KAUTH_RESULT_DEFER; 813 814 p = arg0; 815 cred2 = arg1; 816 817 switch (action) { 818 case KAUTH_PROCESS_CANSIGNAL: { 819 struct proc *to; 820 int signum; 821 822 to = arg2; 823 signum = (int)(unsigned long)arg3; 824 825 if (kauth_cred_uidmatch(cred, cred2) || 826 (signum == SIGCONT && (p->p_session == to->p_session))) 827 error = KAUTH_RESULT_ALLOW; 828 else 829 error = KAUTH_RESULT_DEFER; 830 831 break; 832 } 833 834 case KAUTH_PROCESS_CANPTRACE: 835 if (kauth_cred_uidmatch(cred, cred2)) 836 error = KAUTH_RESULT_ALLOW; 837 else 838 error = KAUTH_RESULT_DENY; 839 break; 840 841 case KAUTH_PROCESS_CANSEE: 842 if (kauth_cred_uidmatch(cred, cred2)) 843 error = KAUTH_RESULT_ALLOW; 844 else 845 error = KAUTH_RESULT_DENY; 846 /* arg2 - type of information [XXX NOTIMPL] */ 847 break; 848 } 849 850 return (error); 851 } 852 853 /* 854 * Process scope authorization wrapper. 855 */ 856 int 857 kauth_authorize_process(kauth_cred_t cred, kauth_action_t action, 858 struct proc *p, void *arg1, void *arg2, void *arg3) 859 { 860 return (kauth_authorize_action(kauth_builtin_scope_process, cred, 861 action, p, arg1, arg2, arg3)); 862 } 863
Indexes created Mon Sep 22 10:09:38 GMT 2025