| 1 | /* $NetBSD: kern_auth.c,v 1.75 2015/10/06 22:13:39 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2005, 2006 Elad Efrat <elad@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. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #include <sys/cdefs.h> |
| 31 | __KERNEL_RCSID(0, "$NetBSD: kern_auth.c,v 1.75 2015/10/06 22:13:39 christos Exp $" ); |
| 32 | |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/param.h> |
| 35 | #include <sys/queue.h> |
| 36 | #include <sys/proc.h> |
| 37 | #include <sys/ucred.h> |
| 38 | #include <sys/pool.h> |
| 39 | #define __KAUTH_PRIVATE |
| 40 | #include <sys/kauth.h> |
| 41 | #include <sys/kmem.h> |
| 42 | #include <sys/rwlock.h> |
| 43 | #include <sys/sysctl.h> |
| 44 | #include <sys/atomic.h> |
| 45 | #include <sys/specificdata.h> |
| 46 | #include <sys/vnode.h> |
| 47 | |
| 48 | #include <secmodel/secmodel.h> |
| 49 | |
| 50 | /* |
| 51 | * Secmodel-specific credentials. |
| 52 | */ |
| 53 | struct kauth_key { |
| 54 | secmodel_t ks_secmodel; /* secmodel */ |
| 55 | specificdata_key_t ks_key; /* key */ |
| 56 | }; |
| 57 | |
| 58 | |
| 59 | /* |
| 60 | * Listener. |
| 61 | */ |
| 62 | struct kauth_listener { |
| 63 | kauth_scope_callback_t func; /* callback */ |
| 64 | kauth_scope_t scope; /* scope backpointer */ |
| 65 | u_int refcnt; /* reference count */ |
| 66 | SIMPLEQ_ENTRY(kauth_listener) listener_next; /* listener list */ |
| 67 | }; |
| 68 | |
| 69 | /* |
| 70 | * Scope. |
| 71 | */ |
| 72 | struct kauth_scope { |
| 73 | const char *id; /* scope name */ |
| 74 | void *cookie; /* user cookie */ |
| 75 | u_int nlisteners; /* # of listeners */ |
| 76 | SIMPLEQ_HEAD(, kauth_listener) listenq; /* listener list */ |
| 77 | SIMPLEQ_ENTRY(kauth_scope) next_scope; /* scope list */ |
| 78 | }; |
| 79 | |
| 80 | static int kauth_cred_hook(kauth_cred_t, kauth_action_t, void *, void *); |
| 81 | |
| 82 | /* List of scopes and its lock. */ |
| 83 | static SIMPLEQ_HEAD(, kauth_scope) scope_list = |
| 84 | SIMPLEQ_HEAD_INITIALIZER(scope_list); |
| 85 | |
| 86 | /* Built-in scopes: generic, process. */ |
| 87 | static kauth_scope_t kauth_builtin_scope_generic; |
| 88 | static kauth_scope_t kauth_builtin_scope_system; |
| 89 | static kauth_scope_t kauth_builtin_scope_process; |
| 90 | static kauth_scope_t kauth_builtin_scope_network; |
| 91 | static kauth_scope_t kauth_builtin_scope_machdep; |
| 92 | static kauth_scope_t kauth_builtin_scope_device; |
| 93 | static kauth_scope_t kauth_builtin_scope_cred; |
| 94 | static kauth_scope_t kauth_builtin_scope_vnode; |
| 95 | |
| 96 | static specificdata_domain_t kauth_domain; |
| 97 | static pool_cache_t kauth_cred_cache; |
| 98 | |
| 99 | krwlock_t kauth_lock; |
| 100 | |
| 101 | /* Allocate new, empty kauth credentials. */ |
| 102 | kauth_cred_t |
| 103 | kauth_cred_alloc(void) |
| 104 | { |
| 105 | kauth_cred_t cred; |
| 106 | |
| 107 | cred = pool_cache_get(kauth_cred_cache, PR_WAITOK); |
| 108 | |
| 109 | cred->cr_refcnt = 1; |
| 110 | cred->cr_uid = 0; |
| 111 | cred->cr_euid = 0; |
| 112 | cred->cr_svuid = 0; |
| 113 | cred->cr_gid = 0; |
| 114 | cred->cr_egid = 0; |
| 115 | cred->cr_svgid = 0; |
| 116 | cred->cr_ngroups = 0; |
| 117 | |
| 118 | specificdata_init(kauth_domain, &cred->cr_sd); |
| 119 | kauth_cred_hook(cred, KAUTH_CRED_INIT, NULL, NULL); |
| 120 | |
| 121 | return (cred); |
| 122 | } |
| 123 | |
| 124 | /* Increment reference count to cred. */ |
| 125 | void |
| 126 | kauth_cred_hold(kauth_cred_t cred) |
| 127 | { |
| 128 | KASSERT(cred != NULL); |
| 129 | KASSERT(cred != NOCRED); |
| 130 | KASSERT(cred != FSCRED); |
| 131 | KASSERT(cred->cr_refcnt > 0); |
| 132 | |
| 133 | atomic_inc_uint(&cred->cr_refcnt); |
| 134 | } |
| 135 | |
| 136 | /* Decrease reference count to cred. If reached zero, free it. */ |
| 137 | void |
| 138 | kauth_cred_free(kauth_cred_t cred) |
| 139 | { |
| 140 | |
| 141 | KASSERT(cred != NULL); |
| 142 | KASSERT(cred != NOCRED); |
| 143 | KASSERT(cred != FSCRED); |
| 144 | KASSERT(cred->cr_refcnt > 0); |
| 145 | ASSERT_SLEEPABLE(); |
| 146 | |
| 147 | if (atomic_dec_uint_nv(&cred->cr_refcnt) > 0) |
| 148 | return; |
| 149 | |
| 150 | kauth_cred_hook(cred, KAUTH_CRED_FREE, NULL, NULL); |
| 151 | specificdata_fini(kauth_domain, &cred->cr_sd); |
| 152 | pool_cache_put(kauth_cred_cache, cred); |
| 153 | } |
| 154 | |
| 155 | static void |
| 156 | kauth_cred_clone1(kauth_cred_t from, kauth_cred_t to, bool copy_groups) |
| 157 | { |
| 158 | KASSERT(from != NULL); |
| 159 | KASSERT(from != NOCRED); |
| 160 | KASSERT(from != FSCRED); |
| 161 | KASSERT(to != NULL); |
| 162 | KASSERT(to != NOCRED); |
| 163 | KASSERT(to != FSCRED); |
| 164 | KASSERT(from->cr_refcnt > 0); |
| 165 | |
| 166 | to->cr_uid = from->cr_uid; |
| 167 | to->cr_euid = from->cr_euid; |
| 168 | to->cr_svuid = from->cr_svuid; |
| 169 | to->cr_gid = from->cr_gid; |
| 170 | to->cr_egid = from->cr_egid; |
| 171 | to->cr_svgid = from->cr_svgid; |
| 172 | if (copy_groups) { |
| 173 | to->cr_ngroups = from->cr_ngroups; |
| 174 | memcpy(to->cr_groups, from->cr_groups, sizeof(to->cr_groups)); |
| 175 | } |
| 176 | |
| 177 | kauth_cred_hook(from, KAUTH_CRED_COPY, to, NULL); |
| 178 | } |
| 179 | |
| 180 | void |
| 181 | kauth_cred_clone(kauth_cred_t from, kauth_cred_t to) |
| 182 | { |
| 183 | kauth_cred_clone1(from, to, true); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Duplicate cred and return a new kauth_cred_t. |
| 188 | */ |
| 189 | kauth_cred_t |
| 190 | kauth_cred_dup(kauth_cred_t cred) |
| 191 | { |
| 192 | kauth_cred_t new_cred; |
| 193 | |
| 194 | KASSERT(cred != NULL); |
| 195 | KASSERT(cred != NOCRED); |
| 196 | KASSERT(cred != FSCRED); |
| 197 | KASSERT(cred->cr_refcnt > 0); |
| 198 | |
| 199 | new_cred = kauth_cred_alloc(); |
| 200 | |
| 201 | kauth_cred_clone(cred, new_cred); |
| 202 | |
| 203 | return (new_cred); |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * Similar to crcopy(), only on a kauth_cred_t. |
| 208 | * XXX: Is this even needed? [kauth_cred_copy] |
| 209 | */ |
| 210 | kauth_cred_t |
| 211 | kauth_cred_copy(kauth_cred_t cred) |
| 212 | { |
| 213 | kauth_cred_t new_cred; |
| 214 | |
| 215 | KASSERT(cred != NULL); |
| 216 | KASSERT(cred != NOCRED); |
| 217 | KASSERT(cred != FSCRED); |
| 218 | KASSERT(cred->cr_refcnt > 0); |
| 219 | |
| 220 | /* If the provided credentials already have one reference, use them. */ |
| 221 | if (cred->cr_refcnt == 1) |
| 222 | return (cred); |
| 223 | |
| 224 | new_cred = kauth_cred_alloc(); |
| 225 | |
| 226 | kauth_cred_clone(cred, new_cred); |
| 227 | |
| 228 | kauth_cred_free(cred); |
| 229 | |
| 230 | return (new_cred); |
| 231 | } |
| 232 | |
| 233 | void |
| 234 | kauth_proc_fork(struct proc *parent, struct proc *child) |
| 235 | { |
| 236 | |
| 237 | mutex_enter(parent->p_lock); |
| 238 | kauth_cred_hold(parent->p_cred); |
| 239 | child->p_cred = parent->p_cred; |
| 240 | mutex_exit(parent->p_lock); |
| 241 | |
| 242 | /* XXX: relies on parent process stalling during fork() */ |
| 243 | kauth_cred_hook(parent->p_cred, KAUTH_CRED_FORK, parent, |
| 244 | child); |
| 245 | } |
| 246 | |
| 247 | void |
| 248 | kauth_proc_chroot(kauth_cred_t cred, struct cwdinfo *cwdi) |
| 249 | { |
| 250 | kauth_cred_hook(cred, KAUTH_CRED_CHROOT, cwdi, NULL); |
| 251 | } |
| 252 | |
| 253 | uid_t |
| 254 | kauth_cred_getuid(kauth_cred_t cred) |
| 255 | { |
| 256 | KASSERT(cred != NULL); |
| 257 | KASSERT(cred != NOCRED); |
| 258 | KASSERT(cred != FSCRED); |
| 259 | |
| 260 | return (cred->cr_uid); |
| 261 | } |
| 262 | |
| 263 | uid_t |
| 264 | kauth_cred_geteuid(kauth_cred_t cred) |
| 265 | { |
| 266 | KASSERT(cred != NULL); |
| 267 | KASSERT(cred != NOCRED); |
| 268 | KASSERT(cred != FSCRED); |
| 269 | |
| 270 | return (cred->cr_euid); |
| 271 | } |
| 272 | |
| 273 | uid_t |
| 274 | kauth_cred_getsvuid(kauth_cred_t cred) |
| 275 | { |
| 276 | KASSERT(cred != NULL); |
| 277 | KASSERT(cred != NOCRED); |
| 278 | KASSERT(cred != FSCRED); |
| 279 | |
| 280 | return (cred->cr_svuid); |
| 281 | } |
| 282 | |
| 283 | gid_t |
| 284 | kauth_cred_getgid(kauth_cred_t cred) |
| 285 | { |
| 286 | KASSERT(cred != NULL); |
| 287 | KASSERT(cred != NOCRED); |
| 288 | KASSERT(cred != FSCRED); |
| 289 | |
| 290 | return (cred->cr_gid); |
| 291 | } |
| 292 | |
| 293 | gid_t |
| 294 | kauth_cred_getegid(kauth_cred_t cred) |
| 295 | { |
| 296 | KASSERT(cred != NULL); |
| 297 | KASSERT(cred != NOCRED); |
| 298 | KASSERT(cred != FSCRED); |
| 299 | |
| 300 | return (cred->cr_egid); |
| 301 | } |
| 302 | |
| 303 | gid_t |
| 304 | kauth_cred_getsvgid(kauth_cred_t cred) |
| 305 | { |
| 306 | KASSERT(cred != NULL); |
| 307 | KASSERT(cred != NOCRED); |
| 308 | KASSERT(cred != FSCRED); |
| 309 | |
| 310 | return (cred->cr_svgid); |
| 311 | } |
| 312 | |
| 313 | void |
| 314 | kauth_cred_setuid(kauth_cred_t cred, uid_t uid) |
| 315 | { |
| 316 | KASSERT(cred != NULL); |
| 317 | KASSERT(cred != NOCRED); |
| 318 | KASSERT(cred != FSCRED); |
| 319 | KASSERT(cred->cr_refcnt == 1); |
| 320 | |
| 321 | cred->cr_uid = uid; |
| 322 | } |
| 323 | |
| 324 | void |
| 325 | kauth_cred_seteuid(kauth_cred_t cred, uid_t uid) |
| 326 | { |
| 327 | KASSERT(cred != NULL); |
| 328 | KASSERT(cred != NOCRED); |
| 329 | KASSERT(cred != FSCRED); |
| 330 | KASSERT(cred->cr_refcnt == 1); |
| 331 | |
| 332 | cred->cr_euid = uid; |
| 333 | } |
| 334 | |
| 335 | void |
| 336 | kauth_cred_setsvuid(kauth_cred_t cred, uid_t uid) |
| 337 | { |
| 338 | KASSERT(cred != NULL); |
| 339 | KASSERT(cred != NOCRED); |
| 340 | KASSERT(cred != FSCRED); |
| 341 | KASSERT(cred->cr_refcnt == 1); |
| 342 | |
| 343 | cred->cr_svuid = uid; |
| 344 | } |
| 345 | |
| 346 | void |
| 347 | kauth_cred_setgid(kauth_cred_t cred, gid_t gid) |
| 348 | { |
| 349 | KASSERT(cred != NULL); |
| 350 | KASSERT(cred != NOCRED); |
| 351 | KASSERT(cred != FSCRED); |
| 352 | KASSERT(cred->cr_refcnt == 1); |
| 353 | |
| 354 | cred->cr_gid = gid; |
| 355 | } |
| 356 | |
| 357 | void |
| 358 | kauth_cred_setegid(kauth_cred_t cred, gid_t gid) |
| 359 | { |
| 360 | KASSERT(cred != NULL); |
| 361 | KASSERT(cred != NOCRED); |
| 362 | KASSERT(cred != FSCRED); |
| 363 | KASSERT(cred->cr_refcnt == 1); |
| 364 | |
| 365 | cred->cr_egid = gid; |
| 366 | } |
| 367 | |
| 368 | void |
| 369 | kauth_cred_setsvgid(kauth_cred_t cred, gid_t gid) |
| 370 | { |
| 371 | KASSERT(cred != NULL); |
| 372 | KASSERT(cred != NOCRED); |
| 373 | KASSERT(cred != FSCRED); |
| 374 | KASSERT(cred->cr_refcnt == 1); |
| 375 | |
| 376 | cred->cr_svgid = gid; |
| 377 | } |
| 378 | |
| 379 | /* Checks if gid is a member of the groups in cred. */ |
| 380 | int |
| 381 | kauth_cred_ismember_gid(kauth_cred_t cred, gid_t gid, int *resultp) |
| 382 | { |
| 383 | uint32_t i; |
| 384 | |
| 385 | KASSERT(cred != NULL); |
| 386 | KASSERT(cred != NOCRED); |
| 387 | KASSERT(cred != FSCRED); |
| 388 | KASSERT(resultp != NULL); |
| 389 | |
| 390 | *resultp = 0; |
| 391 | |
| 392 | for (i = 0; i < cred->cr_ngroups; i++) |
| 393 | if (cred->cr_groups[i] == gid) { |
| 394 | *resultp = 1; |
| 395 | break; |
| 396 | } |
| 397 | |
| 398 | return (0); |
| 399 | } |
| 400 | |
| 401 | u_int |
| 402 | kauth_cred_ngroups(kauth_cred_t cred) |
| 403 | { |
| 404 | KASSERT(cred != NULL); |
| 405 | KASSERT(cred != NOCRED); |
| 406 | KASSERT(cred != FSCRED); |
| 407 | |
| 408 | return (cred->cr_ngroups); |
| 409 | } |
| 410 | |
| 411 | /* |
| 412 | * Return the group at index idx from the groups in cred. |
| 413 | */ |
| 414 | gid_t |
| 415 | kauth_cred_group(kauth_cred_t cred, u_int idx) |
| 416 | { |
| 417 | KASSERT(cred != NULL); |
| 418 | KASSERT(cred != NOCRED); |
| 419 | KASSERT(cred != FSCRED); |
| 420 | KASSERT(idx < cred->cr_ngroups); |
| 421 | |
| 422 | return (cred->cr_groups[idx]); |
| 423 | } |
| 424 | |
| 425 | /* XXX elad: gmuid is unused for now. */ |
| 426 | int |
| 427 | kauth_cred_setgroups(kauth_cred_t cred, const gid_t *grbuf, size_t len, |
| 428 | uid_t gmuid, enum uio_seg seg) |
| 429 | { |
| 430 | int error = 0; |
| 431 | |
| 432 | KASSERT(cred != NULL); |
| 433 | KASSERT(cred != NOCRED); |
| 434 | KASSERT(cred != FSCRED); |
| 435 | KASSERT(cred->cr_refcnt == 1); |
| 436 | |
| 437 | if (len > __arraycount(cred->cr_groups)) |
| 438 | return EINVAL; |
| 439 | |
| 440 | if (len) { |
| 441 | if (seg == UIO_SYSSPACE) { |
| 442 | memcpy(cred->cr_groups, grbuf, |
| 443 | len * sizeof(cred->cr_groups[0])); |
| 444 | } else { |
| 445 | error = copyin(grbuf, cred->cr_groups, |
| 446 | len * sizeof(cred->cr_groups[0])); |
| 447 | if (error != 0) |
| 448 | len = 0; |
| 449 | } |
| 450 | } |
| 451 | memset(cred->cr_groups + len, 0xff, |
| 452 | sizeof(cred->cr_groups) - (len * sizeof(cred->cr_groups[0]))); |
| 453 | |
| 454 | cred->cr_ngroups = len; |
| 455 | |
| 456 | return error; |
| 457 | } |
| 458 | |
| 459 | /* This supports sys_setgroups() */ |
| 460 | int |
| 461 | kauth_proc_setgroups(struct lwp *l, kauth_cred_t ncred) |
| 462 | { |
| 463 | kauth_cred_t cred; |
| 464 | int error; |
| 465 | |
| 466 | /* |
| 467 | * At this point we could delete duplicate groups from ncred, |
| 468 | * and plausibly sort the list - but in general the later is |
| 469 | * a bad idea. |
| 470 | */ |
| 471 | proc_crmod_enter(); |
| 472 | /* Maybe we should use curproc here ? */ |
| 473 | cred = l->l_proc->p_cred; |
| 474 | |
| 475 | kauth_cred_clone1(cred, ncred, false); |
| 476 | |
| 477 | error = kauth_authorize_process(cred, KAUTH_PROCESS_SETID, |
| 478 | l->l_proc, NULL, NULL, NULL); |
| 479 | if (error != 0) { |
| 480 | proc_crmod_leave(cred, ncred, false); |
| 481 | return error; |
| 482 | } |
| 483 | |
| 484 | /* Broadcast our credentials to the process and other LWPs. */ |
| 485 | proc_crmod_leave(ncred, cred, true); |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | int |
| 490 | kauth_cred_getgroups(kauth_cred_t cred, gid_t *grbuf, size_t len, |
| 491 | enum uio_seg seg) |
| 492 | { |
| 493 | KASSERT(cred != NULL); |
| 494 | |
| 495 | if (len > cred->cr_ngroups) |
| 496 | return EINVAL; |
| 497 | |
| 498 | if (seg == UIO_USERSPACE) |
| 499 | return copyout(cred->cr_groups, grbuf, sizeof(*grbuf) * len); |
| 500 | memcpy(grbuf, cred->cr_groups, sizeof(*grbuf) * len); |
| 501 | |
| 502 | return 0; |
| 503 | } |
| 504 | |
| 505 | int |
| 506 | kauth_register_key(secmodel_t secmodel, kauth_key_t *result) |
| 507 | { |
| 508 | kauth_key_t k; |
| 509 | specificdata_key_t key; |
| 510 | int error; |
| 511 | |
| 512 | KASSERT(result != NULL); |
| 513 | |
| 514 | error = specificdata_key_create(kauth_domain, &key, NULL); |
| 515 | if (error) |
| 516 | return (error); |
| 517 | |
| 518 | k = kmem_alloc(sizeof(*k), KM_SLEEP); |
| 519 | k->ks_secmodel = secmodel; |
| 520 | k->ks_key = key; |
| 521 | |
| 522 | *result = k; |
| 523 | |
| 524 | return (0); |
| 525 | } |
| 526 | |
| 527 | int |
| 528 | kauth_deregister_key(kauth_key_t key) |
| 529 | { |
| 530 | KASSERT(key != NULL); |
| 531 | |
| 532 | specificdata_key_delete(kauth_domain, key->ks_key); |
| 533 | kmem_free(key, sizeof(*key)); |
| 534 | |
| 535 | return (0); |
| 536 | } |
| 537 | |
| 538 | void * |
| 539 | kauth_cred_getdata(kauth_cred_t cred, kauth_key_t key) |
| 540 | { |
| 541 | KASSERT(cred != NULL); |
| 542 | KASSERT(cred != NOCRED); |
| 543 | KASSERT(cred != FSCRED); |
| 544 | KASSERT(key != NULL); |
| 545 | |
| 546 | return (specificdata_getspecific(kauth_domain, &cred->cr_sd, |
| 547 | key->ks_key)); |
| 548 | } |
| 549 | |
| 550 | void |
| 551 | kauth_cred_setdata(kauth_cred_t cred, kauth_key_t key, void *data) |
| 552 | { |
| 553 | KASSERT(cred != NULL); |
| 554 | KASSERT(cred != NOCRED); |
| 555 | KASSERT(cred != FSCRED); |
| 556 | KASSERT(key != NULL); |
| 557 | |
| 558 | specificdata_setspecific(kauth_domain, &cred->cr_sd, key->ks_key, data); |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * Match uids in two credentials. |
| 563 | */ |
| 564 | int |
| 565 | kauth_cred_uidmatch(kauth_cred_t cred1, kauth_cred_t cred2) |
| 566 | { |
| 567 | KASSERT(cred1 != NULL); |
| 568 | KASSERT(cred1 != NOCRED); |
| 569 | KASSERT(cred1 != FSCRED); |
| 570 | KASSERT(cred2 != NULL); |
| 571 | KASSERT(cred2 != NOCRED); |
| 572 | KASSERT(cred2 != FSCRED); |
| 573 | |
| 574 | if (cred1->cr_uid == cred2->cr_uid || |
| 575 | cred1->cr_euid == cred2->cr_uid || |
| 576 | cred1->cr_uid == cred2->cr_euid || |
| 577 | cred1->cr_euid == cred2->cr_euid) |
| 578 | return (1); |
| 579 | |
| 580 | return (0); |
| 581 | } |
| 582 | |
| 583 | u_int |
| 584 | kauth_cred_getrefcnt(kauth_cred_t cred) |
| 585 | { |
| 586 | KASSERT(cred != NULL); |
| 587 | KASSERT(cred != NOCRED); |
| 588 | KASSERT(cred != FSCRED); |
| 589 | |
| 590 | return (cred->cr_refcnt); |
| 591 | } |
| 592 | |
| 593 | /* |
| 594 | * Convert userland credentials (struct uucred) to kauth_cred_t. |
| 595 | * XXX: For NFS & puffs |
| 596 | */ |
| 597 | void |
| 598 | kauth_uucred_to_cred(kauth_cred_t cred, const struct uucred *uuc) |
| 599 | { |
| 600 | KASSERT(cred != NULL); |
| 601 | KASSERT(cred != NOCRED); |
| 602 | KASSERT(cred != FSCRED); |
| 603 | KASSERT(uuc != NULL); |
| 604 | |
| 605 | cred->cr_refcnt = 1; |
| 606 | cred->cr_uid = uuc->cr_uid; |
| 607 | cred->cr_euid = uuc->cr_uid; |
| 608 | cred->cr_svuid = uuc->cr_uid; |
| 609 | cred->cr_gid = uuc->cr_gid; |
| 610 | cred->cr_egid = uuc->cr_gid; |
| 611 | cred->cr_svgid = uuc->cr_gid; |
| 612 | cred->cr_ngroups = min(uuc->cr_ngroups, NGROUPS); |
| 613 | kauth_cred_setgroups(cred, __UNCONST(uuc->cr_groups), |
| 614 | cred->cr_ngroups, -1, UIO_SYSSPACE); |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * Convert kauth_cred_t to userland credentials (struct uucred). |
| 619 | * XXX: For NFS & puffs |
| 620 | */ |
| 621 | void |
| 622 | kauth_cred_to_uucred(struct uucred *uuc, const kauth_cred_t cred) |
| 623 | { |
| 624 | KASSERT(cred != NULL); |
| 625 | KASSERT(cred != NOCRED); |
| 626 | KASSERT(cred != FSCRED); |
| 627 | KASSERT(uuc != NULL); |
| 628 | int ng; |
| 629 | |
| 630 | ng = min(cred->cr_ngroups, NGROUPS); |
| 631 | uuc->cr_uid = cred->cr_euid; |
| 632 | uuc->cr_gid = cred->cr_egid; |
| 633 | uuc->cr_ngroups = ng; |
| 634 | kauth_cred_getgroups(cred, uuc->cr_groups, ng, UIO_SYSSPACE); |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Compare kauth_cred_t and uucred credentials. |
| 639 | * XXX: Modelled after crcmp() for NFS. |
| 640 | */ |
| 641 | int |
| 642 | kauth_cred_uucmp(kauth_cred_t cred, const struct uucred *uuc) |
| 643 | { |
| 644 | KASSERT(cred != NULL); |
| 645 | KASSERT(cred != NOCRED); |
| 646 | KASSERT(cred != FSCRED); |
| 647 | KASSERT(uuc != NULL); |
| 648 | |
| 649 | if (cred->cr_euid == uuc->cr_uid && |
| 650 | cred->cr_egid == uuc->cr_gid && |
| 651 | cred->cr_ngroups == (uint32_t)uuc->cr_ngroups) { |
| 652 | int i; |
| 653 | |
| 654 | /* Check if all groups from uuc appear in cred. */ |
| 655 | for (i = 0; i < uuc->cr_ngroups; i++) { |
| 656 | int ismember; |
| 657 | |
| 658 | ismember = 0; |
| 659 | if (kauth_cred_ismember_gid(cred, uuc->cr_groups[i], |
| 660 | &ismember) != 0 || !ismember) |
| 661 | return (1); |
| 662 | } |
| 663 | |
| 664 | return (0); |
| 665 | } |
| 666 | |
| 667 | return (1); |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * Make a struct ucred out of a kauth_cred_t. For compatibility. |
| 672 | */ |
| 673 | void |
| 674 | kauth_cred_toucred(kauth_cred_t cred, struct ki_ucred *uc) |
| 675 | { |
| 676 | KASSERT(cred != NULL); |
| 677 | KASSERT(cred != NOCRED); |
| 678 | KASSERT(cred != FSCRED); |
| 679 | KASSERT(uc != NULL); |
| 680 | |
| 681 | uc->cr_ref = cred->cr_refcnt; |
| 682 | uc->cr_uid = cred->cr_euid; |
| 683 | uc->cr_gid = cred->cr_egid; |
| 684 | uc->cr_ngroups = min(cred->cr_ngroups, __arraycount(uc->cr_groups)); |
| 685 | memcpy(uc->cr_groups, cred->cr_groups, |
| 686 | uc->cr_ngroups * sizeof(uc->cr_groups[0])); |
| 687 | } |
| 688 | |
| 689 | /* |
| 690 | * Make a struct pcred out of a kauth_cred_t. For compatibility. |
| 691 | */ |
| 692 | void |
| 693 | kauth_cred_topcred(kauth_cred_t cred, struct ki_pcred *pc) |
| 694 | { |
| 695 | KASSERT(cred != NULL); |
| 696 | KASSERT(cred != NOCRED); |
| 697 | KASSERT(cred != FSCRED); |
| 698 | KASSERT(pc != NULL); |
| 699 | |
| 700 | pc->p_pad = NULL; |
| 701 | pc->p_ruid = cred->cr_uid; |
| 702 | pc->p_svuid = cred->cr_svuid; |
| 703 | pc->p_rgid = cred->cr_gid; |
| 704 | pc->p_svgid = cred->cr_svgid; |
| 705 | pc->p_refcnt = cred->cr_refcnt; |
| 706 | } |
| 707 | |
| 708 | /* |
| 709 | * Return kauth_cred_t for the current LWP. |
| 710 | */ |
| 711 | kauth_cred_t |
| 712 | kauth_cred_get(void) |
| 713 | { |
| 714 | return (curlwp->l_cred); |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | * Returns a scope matching the provided id. |
| 719 | * Requires the scope list lock to be held by the caller. |
| 720 | */ |
| 721 | static kauth_scope_t |
| 722 | kauth_ifindscope(const char *id) |
| 723 | { |
| 724 | kauth_scope_t scope; |
| 725 | |
| 726 | KASSERT(rw_lock_held(&kauth_lock)); |
| 727 | |
| 728 | scope = NULL; |
| 729 | SIMPLEQ_FOREACH(scope, &scope_list, next_scope) { |
| 730 | if (strcmp(scope->id, id) == 0) |
| 731 | break; |
| 732 | } |
| 733 | |
| 734 | return (scope); |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Register a new scope. |
| 739 | * |
| 740 | * id - identifier for the scope |
| 741 | * callback - the scope's default listener |
| 742 | * cookie - cookie to be passed to the listener(s) |
| 743 | */ |
| 744 | kauth_scope_t |
| 745 | kauth_register_scope(const char *id, kauth_scope_callback_t callback, |
| 746 | void *cookie) |
| 747 | { |
| 748 | kauth_scope_t scope; |
| 749 | kauth_listener_t listener = NULL; /* XXX gcc */ |
| 750 | |
| 751 | /* Sanitize input */ |
| 752 | if (id == NULL) |
| 753 | return (NULL); |
| 754 | |
| 755 | /* Allocate space for a new scope and listener. */ |
| 756 | scope = kmem_alloc(sizeof(*scope), KM_SLEEP); |
| 757 | if (scope == NULL) |
| 758 | return NULL; |
| 759 | if (callback != NULL) { |
| 760 | listener = kmem_alloc(sizeof(*listener), KM_SLEEP); |
| 761 | if (listener == NULL) { |
| 762 | kmem_free(scope, sizeof(*scope)); |
| 763 | return (NULL); |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | /* |
| 768 | * Acquire scope list lock. |
| 769 | */ |
| 770 | rw_enter(&kauth_lock, RW_WRITER); |
| 771 | |
| 772 | /* Check we don't already have a scope with the same id */ |
| 773 | if (kauth_ifindscope(id) != NULL) { |
| 774 | rw_exit(&kauth_lock); |
| 775 | |
| 776 | kmem_free(scope, sizeof(*scope)); |
| 777 | if (callback != NULL) |
| 778 | kmem_free(listener, sizeof(*listener)); |
| 779 | |
| 780 | return (NULL); |
| 781 | } |
| 782 | |
| 783 | /* Initialize new scope with parameters */ |
| 784 | scope->id = id; |
| 785 | scope->cookie = cookie; |
| 786 | scope->nlisteners = 1; |
| 787 | |
| 788 | SIMPLEQ_INIT(&scope->listenq); |
| 789 | |
| 790 | /* Add default listener */ |
| 791 | if (callback != NULL) { |
| 792 | listener->func = callback; |
| 793 | listener->scope = scope; |
| 794 | listener->refcnt = 0; |
| 795 | SIMPLEQ_INSERT_HEAD(&scope->listenq, listener, listener_next); |
| 796 | } |
| 797 | |
| 798 | /* Insert scope to scopes list */ |
| 799 | SIMPLEQ_INSERT_TAIL(&scope_list, scope, next_scope); |
| 800 | |
| 801 | rw_exit(&kauth_lock); |
| 802 | |
| 803 | return (scope); |
| 804 | } |
| 805 | |
| 806 | /* |
| 807 | * Initialize the kernel authorization subsystem. |
| 808 | * |
| 809 | * Initialize the scopes list lock. |
| 810 | * Create specificdata domain. |
| 811 | * Register the credentials scope, used in kauth(9) internally. |
| 812 | * Register built-in scopes: generic, system, process, network, machdep, device. |
| 813 | */ |
| 814 | void |
| 815 | kauth_init(void) |
| 816 | { |
| 817 | rw_init(&kauth_lock); |
| 818 | |
| 819 | kauth_cred_cache = pool_cache_init(sizeof(struct kauth_cred), |
| 820 | coherency_unit, 0, 0, "kcredpl" , NULL, IPL_NONE, |
| 821 | NULL, NULL, NULL); |
| 822 | |
| 823 | /* Create specificdata domain. */ |
| 824 | kauth_domain = specificdata_domain_create(); |
| 825 | |
| 826 | /* Register credentials scope. */ |
| 827 | kauth_builtin_scope_cred = |
| 828 | kauth_register_scope(KAUTH_SCOPE_CRED, NULL, NULL); |
| 829 | |
| 830 | /* Register generic scope. */ |
| 831 | kauth_builtin_scope_generic = kauth_register_scope(KAUTH_SCOPE_GENERIC, |
| 832 | NULL, NULL); |
| 833 | |
| 834 | /* Register system scope. */ |
| 835 | kauth_builtin_scope_system = kauth_register_scope(KAUTH_SCOPE_SYSTEM, |
| 836 | NULL, NULL); |
| 837 | |
| 838 | /* Register process scope. */ |
| 839 | kauth_builtin_scope_process = kauth_register_scope(KAUTH_SCOPE_PROCESS, |
| 840 | NULL, NULL); |
| 841 | |
| 842 | /* Register network scope. */ |
| 843 | kauth_builtin_scope_network = kauth_register_scope(KAUTH_SCOPE_NETWORK, |
| 844 | NULL, NULL); |
| 845 | |
| 846 | /* Register machdep scope. */ |
| 847 | kauth_builtin_scope_machdep = kauth_register_scope(KAUTH_SCOPE_MACHDEP, |
| 848 | NULL, NULL); |
| 849 | |
| 850 | /* Register device scope. */ |
| 851 | kauth_builtin_scope_device = kauth_register_scope(KAUTH_SCOPE_DEVICE, |
| 852 | NULL, NULL); |
| 853 | |
| 854 | /* Register vnode scope. */ |
| 855 | kauth_builtin_scope_vnode = kauth_register_scope(KAUTH_SCOPE_VNODE, |
| 856 | NULL, NULL); |
| 857 | } |
| 858 | |
| 859 | /* |
| 860 | * Deregister a scope. |
| 861 | * Requires scope list lock to be held by the caller. |
| 862 | * |
| 863 | * scope - the scope to deregister |
| 864 | */ |
| 865 | void |
| 866 | kauth_deregister_scope(kauth_scope_t scope) |
| 867 | { |
| 868 | if (scope != NULL) { |
| 869 | /* Remove scope from list */ |
| 870 | SIMPLEQ_REMOVE(&scope_list, scope, kauth_scope, next_scope); |
| 871 | kmem_free(scope, sizeof(*scope)); |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | /* |
| 876 | * Register a listener. |
| 877 | * |
| 878 | * id - scope identifier. |
| 879 | * callback - the callback routine for the listener. |
| 880 | * cookie - cookie to pass unmoidfied to the callback. |
| 881 | */ |
| 882 | kauth_listener_t |
| 883 | kauth_listen_scope(const char *id, kauth_scope_callback_t callback, |
| 884 | void *cookie) |
| 885 | { |
| 886 | kauth_scope_t scope; |
| 887 | kauth_listener_t listener; |
| 888 | |
| 889 | listener = kmem_alloc(sizeof(*listener), KM_SLEEP); |
| 890 | if (listener == NULL) |
| 891 | return (NULL); |
| 892 | |
| 893 | rw_enter(&kauth_lock, RW_WRITER); |
| 894 | |
| 895 | /* |
| 896 | * Find scope struct. |
| 897 | */ |
| 898 | scope = kauth_ifindscope(id); |
| 899 | if (scope == NULL) { |
| 900 | rw_exit(&kauth_lock); |
| 901 | kmem_free(listener, sizeof(*listener)); |
| 902 | return (NULL); |
| 903 | } |
| 904 | |
| 905 | /* Allocate listener */ |
| 906 | |
| 907 | /* Initialize listener with parameters */ |
| 908 | listener->func = callback; |
| 909 | listener->refcnt = 0; |
| 910 | |
| 911 | /* Add listener to scope */ |
| 912 | SIMPLEQ_INSERT_TAIL(&scope->listenq, listener, listener_next); |
| 913 | |
| 914 | /* Raise number of listeners on scope. */ |
| 915 | scope->nlisteners++; |
| 916 | listener->scope = scope; |
| 917 | |
| 918 | rw_exit(&kauth_lock); |
| 919 | |
| 920 | return (listener); |
| 921 | } |
| 922 | |
| 923 | /* |
| 924 | * Deregister a listener. |
| 925 | * |
| 926 | * listener - listener reference as returned from kauth_listen_scope(). |
| 927 | */ |
| 928 | void |
| 929 | kauth_unlisten_scope(kauth_listener_t listener) |
| 930 | { |
| 931 | |
| 932 | if (listener != NULL) { |
| 933 | rw_enter(&kauth_lock, RW_WRITER); |
| 934 | SIMPLEQ_REMOVE(&listener->scope->listenq, listener, |
| 935 | kauth_listener, listener_next); |
| 936 | listener->scope->nlisteners--; |
| 937 | rw_exit(&kauth_lock); |
| 938 | kmem_free(listener, sizeof(*listener)); |
| 939 | } |
| 940 | } |
| 941 | |
| 942 | /* |
| 943 | * Authorize a request. |
| 944 | * |
| 945 | * scope - the scope of the request as defined by KAUTH_SCOPE_* or as |
| 946 | * returned from kauth_register_scope(). |
| 947 | * credential - credentials of the user ("actor") making the request. |
| 948 | * action - request identifier. |
| 949 | * arg[0-3] - passed unmodified to listener(s). |
| 950 | * |
| 951 | * Returns the aggregated result: |
| 952 | * - KAUTH_RESULT_ALLOW if there is at least one KAUTH_RESULT_ALLOW and |
| 953 | * zero KAUTH_DESULT_DENY |
| 954 | * - KAUTH_RESULT_DENY if there is at least one KAUTH_RESULT_DENY |
| 955 | * - KAUTH_RESULT_DEFER if there is nothing but KAUTH_RESULT_DEFER |
| 956 | */ |
| 957 | static int |
| 958 | kauth_authorize_action_internal(kauth_scope_t scope, kauth_cred_t cred, |
| 959 | kauth_action_t action, void *arg0, void *arg1, void *arg2, void *arg3) |
| 960 | { |
| 961 | kauth_listener_t listener; |
| 962 | int error, allow, fail; |
| 963 | |
| 964 | KASSERT(cred != NULL); |
| 965 | KASSERT(action != 0); |
| 966 | |
| 967 | /* Short-circuit requests coming from the kernel. */ |
| 968 | if (cred == NOCRED || cred == FSCRED) |
| 969 | return KAUTH_RESULT_ALLOW; |
| 970 | |
| 971 | KASSERT(scope != NULL); |
| 972 | |
| 973 | fail = 0; |
| 974 | allow = 0; |
| 975 | |
| 976 | /* rw_enter(&kauth_lock, RW_READER); XXX not yet */ |
| 977 | SIMPLEQ_FOREACH(listener, &scope->listenq, listener_next) { |
| 978 | error = listener->func(cred, action, scope->cookie, arg0, |
| 979 | arg1, arg2, arg3); |
| 980 | |
| 981 | if (error == KAUTH_RESULT_ALLOW) |
| 982 | allow = 1; |
| 983 | else if (error == KAUTH_RESULT_DENY) |
| 984 | fail = 1; |
| 985 | } |
| 986 | /* rw_exit(&kauth_lock); */ |
| 987 | |
| 988 | if (fail) |
| 989 | return (KAUTH_RESULT_DENY); |
| 990 | |
| 991 | if (allow) |
| 992 | return (KAUTH_RESULT_ALLOW); |
| 993 | |
| 994 | return (KAUTH_RESULT_DEFER); |
| 995 | }; |
| 996 | |
| 997 | int |
| 998 | kauth_authorize_action(kauth_scope_t scope, kauth_cred_t cred, |
| 999 | kauth_action_t action, void *arg0, void *arg1, void *arg2, void *arg3) |
| 1000 | { |
| 1001 | int r; |
| 1002 | |
| 1003 | r = kauth_authorize_action_internal(scope, cred, action, arg0, arg1, |
| 1004 | arg2, arg3); |
| 1005 | |
| 1006 | if (r == KAUTH_RESULT_DENY) |
| 1007 | return (EPERM); |
| 1008 | |
| 1009 | if (r == KAUTH_RESULT_ALLOW) |
| 1010 | return (0); |
| 1011 | |
| 1012 | if (secmodel_nsecmodels() == 0) |
| 1013 | return (0); |
| 1014 | |
| 1015 | return (EPERM); |
| 1016 | } |
| 1017 | |
| 1018 | /* |
| 1019 | * Generic scope authorization wrapper. |
| 1020 | */ |
| 1021 | int |
| 1022 | kauth_authorize_generic(kauth_cred_t cred, kauth_action_t action, void *arg0) |
| 1023 | { |
| 1024 | return (kauth_authorize_action(kauth_builtin_scope_generic, cred, |
| 1025 | action, arg0, NULL, NULL, NULL)); |
| 1026 | } |
| 1027 | |
| 1028 | /* |
| 1029 | * System scope authorization wrapper. |
| 1030 | */ |
| 1031 | int |
| 1032 | kauth_authorize_system(kauth_cred_t cred, kauth_action_t action, |
| 1033 | enum kauth_system_req req, void *arg1, void *arg2, void *arg3) |
| 1034 | { |
| 1035 | return (kauth_authorize_action(kauth_builtin_scope_system, cred, |
| 1036 | action, (void *)req, arg1, arg2, arg3)); |
| 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * Process scope authorization wrapper. |
| 1041 | */ |
| 1042 | int |
| 1043 | kauth_authorize_process(kauth_cred_t cred, kauth_action_t action, |
| 1044 | struct proc *p, void *arg1, void *arg2, void *arg3) |
| 1045 | { |
| 1046 | return (kauth_authorize_action(kauth_builtin_scope_process, cred, |
| 1047 | action, p, arg1, arg2, arg3)); |
| 1048 | } |
| 1049 | |
| 1050 | /* |
| 1051 | * Network scope authorization wrapper. |
| 1052 | */ |
| 1053 | int |
| 1054 | kauth_authorize_network(kauth_cred_t cred, kauth_action_t action, |
| 1055 | enum kauth_network_req req, void *arg1, void *arg2, void *arg3) |
| 1056 | { |
| 1057 | return (kauth_authorize_action(kauth_builtin_scope_network, cred, |
| 1058 | action, (void *)req, arg1, arg2, arg3)); |
| 1059 | } |
| 1060 | |
| 1061 | int |
| 1062 | kauth_authorize_machdep(kauth_cred_t cred, kauth_action_t action, |
| 1063 | void *arg0, void *arg1, void *arg2, void *arg3) |
| 1064 | { |
| 1065 | return (kauth_authorize_action(kauth_builtin_scope_machdep, cred, |
| 1066 | action, arg0, arg1, arg2, arg3)); |
| 1067 | } |
| 1068 | |
| 1069 | int |
| 1070 | kauth_authorize_device(kauth_cred_t cred, kauth_action_t action, |
| 1071 | void *arg0, void *arg1, void *arg2, void *arg3) |
| 1072 | { |
| 1073 | return (kauth_authorize_action(kauth_builtin_scope_device, cred, |
| 1074 | action, arg0, arg1, arg2, arg3)); |
| 1075 | } |
| 1076 | |
| 1077 | int |
| 1078 | kauth_authorize_device_tty(kauth_cred_t cred, kauth_action_t action, |
| 1079 | struct tty *tty) |
| 1080 | { |
| 1081 | return (kauth_authorize_action(kauth_builtin_scope_device, cred, |
| 1082 | action, tty, NULL, NULL, NULL)); |
| 1083 | } |
| 1084 | |
| 1085 | int |
| 1086 | kauth_authorize_device_spec(kauth_cred_t cred, enum kauth_device_req req, |
| 1087 | struct vnode *vp) |
| 1088 | { |
| 1089 | return (kauth_authorize_action(kauth_builtin_scope_device, cred, |
| 1090 | KAUTH_DEVICE_RAWIO_SPEC, (void *)req, vp, NULL, NULL)); |
| 1091 | } |
| 1092 | |
| 1093 | int |
| 1094 | kauth_authorize_device_passthru(kauth_cred_t cred, dev_t dev, u_long bits, |
| 1095 | void *data) |
| 1096 | { |
| 1097 | return (kauth_authorize_action(kauth_builtin_scope_device, cred, |
| 1098 | KAUTH_DEVICE_RAWIO_PASSTHRU, (void *)bits, (void *)(u_long)dev, |
| 1099 | data, NULL)); |
| 1100 | } |
| 1101 | |
| 1102 | kauth_action_t |
| 1103 | kauth_mode_to_action(mode_t mode) |
| 1104 | { |
| 1105 | kauth_action_t action = 0; |
| 1106 | |
| 1107 | if (mode & VREAD) |
| 1108 | action |= KAUTH_VNODE_READ_DATA; |
| 1109 | if (mode & VWRITE) |
| 1110 | action |= KAUTH_VNODE_WRITE_DATA; |
| 1111 | if (mode & VEXEC) |
| 1112 | action |= KAUTH_VNODE_EXECUTE; |
| 1113 | |
| 1114 | return action; |
| 1115 | } |
| 1116 | |
| 1117 | kauth_action_t |
| 1118 | kauth_extattr_action(mode_t access_mode) |
| 1119 | { |
| 1120 | kauth_action_t action = 0; |
| 1121 | |
| 1122 | if (access_mode & VREAD) |
| 1123 | action |= KAUTH_VNODE_READ_EXTATTRIBUTES; |
| 1124 | if (access_mode & VWRITE) |
| 1125 | action |= KAUTH_VNODE_WRITE_EXTATTRIBUTES; |
| 1126 | |
| 1127 | return action; |
| 1128 | } |
| 1129 | |
| 1130 | int |
| 1131 | kauth_authorize_vnode(kauth_cred_t cred, kauth_action_t action, |
| 1132 | struct vnode *vp, struct vnode *dvp, int fs_decision) |
| 1133 | { |
| 1134 | int error; |
| 1135 | |
| 1136 | error = kauth_authorize_action_internal(kauth_builtin_scope_vnode, cred, |
| 1137 | action, vp, dvp, NULL, NULL); |
| 1138 | |
| 1139 | if (error == KAUTH_RESULT_DENY) |
| 1140 | return (EACCES); |
| 1141 | |
| 1142 | if (error == KAUTH_RESULT_ALLOW) |
| 1143 | return (0); |
| 1144 | |
| 1145 | /* |
| 1146 | * If the file-system does not support decision-before-action, we can |
| 1147 | * only short-circuit the operation (deny). If we're here, it means no |
| 1148 | * listener denied it, so our only alternative is to supposedly-allow |
| 1149 | * it and let the file-system have the last word. |
| 1150 | */ |
| 1151 | if (fs_decision == KAUTH_VNODE_REMOTEFS) |
| 1152 | return (0); |
| 1153 | |
| 1154 | return (fs_decision); |
| 1155 | } |
| 1156 | |
| 1157 | static int |
| 1158 | kauth_cred_hook(kauth_cred_t cred, kauth_action_t action, void *arg0, |
| 1159 | void *arg1) |
| 1160 | { |
| 1161 | int r; |
| 1162 | |
| 1163 | r = kauth_authorize_action(kauth_builtin_scope_cred, cred, action, |
| 1164 | arg0, arg1, NULL, NULL); |
| 1165 | |
| 1166 | #ifdef DIAGNOSTIC |
| 1167 | if (!SIMPLEQ_EMPTY(&kauth_builtin_scope_cred->listenq)) |
| 1168 | KASSERT(r == 0); |
| 1169 | #endif /* DIAGNOSTIC */ |
| 1170 | |
| 1171 | return (r); |
| 1172 | } |
| 1173 | |