FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_acl.c
1 /*-
2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * This software was developed by Robert Watson for the TrustedBSD Project.
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/5.1/sys/kern/kern_acl.c 109153 2003-01-13 00:33:17Z dillon $
29 */
30 /*
31 * Developed by the TrustedBSD Project.
32 * Support for POSIX.1e access control lists.
33 */
34
35 #include "opt_mac.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/sysproto.h>
40 #include <sys/kernel.h>
41 #include <sys/mac.h>
42 #include <sys/malloc.h>
43 #include <sys/vnode.h>
44 #include <sys/lock.h>
45 #include <sys/mutex.h>
46 #include <sys/namei.h>
47 #include <sys/file.h>
48 #include <sys/filedesc.h>
49 #include <sys/proc.h>
50 #include <sys/sysent.h>
51 #include <sys/errno.h>
52 #include <sys/stat.h>
53 #include <sys/acl.h>
54
55 MALLOC_DEFINE(M_ACL, "acl", "access control list");
56
57 static int vacl_set_acl(struct thread *td, struct vnode *vp,
58 acl_type_t type, struct acl *aclp);
59 static int vacl_get_acl(struct thread *td, struct vnode *vp,
60 acl_type_t type, struct acl *aclp);
61 static int vacl_aclcheck(struct thread *td, struct vnode *vp,
62 acl_type_t type, struct acl *aclp);
63
64 /*
65 * Implement a version of vaccess() that understands POSIX.1e ACL semantics.
66 * Return 0 on success, else an errno value. Should be merged into
67 * vaccess() eventually.
68 */
69 int
70 vaccess_acl_posix1e(enum vtype type, uid_t file_uid, gid_t file_gid,
71 struct acl *acl, mode_t acc_mode, struct ucred *cred, int *privused)
72 {
73 struct acl_entry *acl_other, *acl_mask;
74 mode_t dac_granted;
75 mode_t cap_granted;
76 mode_t acl_mask_granted;
77 int group_matched, i;
78
79 /*
80 * Look for a normal, non-privileged way to access the file/directory
81 * as requested. If it exists, go with that. Otherwise, attempt
82 * to use privileges granted via cap_granted. In some cases,
83 * which privileges to use may be ambiguous due to "best match",
84 * in which case fall back on first match for the time being.
85 */
86 if (privused != NULL)
87 *privused = 0;
88
89 /*
90 * Determine privileges now, but don't apply until we've found
91 * a DAC entry that matches but has failed to allow access.
92 */
93 #ifndef CAPABILITIES
94 if (suser_cred(cred, PRISON_ROOT) == 0)
95 cap_granted = VALLPERM;
96 else
97 cap_granted = 0;
98 #else
99 cap_granted = 0;
100
101 if (type == VDIR) {
102 if ((acc_mode & VEXEC) && !cap_check(cred, NULL,
103 CAP_DAC_READ_SEARCH, PRISON_ROOT))
104 cap_granted |= VEXEC;
105 } else {
106 if ((acc_mode & VEXEC) && !cap_check(cred, NULL,
107 CAP_DAC_EXECUTE, PRISON_ROOT))
108 cap_granted |= VEXEC;
109 }
110
111 if ((acc_mode & VREAD) && !cap_check(cred, NULL, CAP_DAC_READ_SEARCH,
112 PRISON_ROOT))
113 cap_granted |= VREAD;
114
115 if (((acc_mode & VWRITE) || (acc_mode & VAPPEND)) &&
116 !cap_check(cred, NULL, CAP_DAC_WRITE, PRISON_ROOT))
117 cap_granted |= (VWRITE | VAPPEND);
118
119 if ((acc_mode & VADMIN) && !cap_check(cred, NULL, CAP_FOWNER,
120 PRISON_ROOT))
121 cap_granted |= VADMIN;
122 #endif /* CAPABILITIES */
123
124 /*
125 * The owner matches if the effective uid associated with the
126 * credential matches that of the ACL_USER_OBJ entry. While we're
127 * doing the first scan, also cache the location of the ACL_MASK
128 * and ACL_OTHER entries, preventing some future iterations.
129 */
130 acl_mask = acl_other = NULL;
131 for (i = 0; i < acl->acl_cnt; i++) {
132 switch (acl->acl_entry[i].ae_tag) {
133 case ACL_USER_OBJ:
134 if (file_uid != cred->cr_uid)
135 break;
136 dac_granted = 0;
137 dac_granted |= VADMIN;
138 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
139 dac_granted |= VEXEC;
140 if (acl->acl_entry[i].ae_perm & ACL_READ)
141 dac_granted |= VREAD;
142 if (acl->acl_entry[i].ae_perm & ACL_WRITE)
143 dac_granted |= (VWRITE | VAPPEND);
144 if ((acc_mode & dac_granted) == acc_mode)
145 return (0);
146 if ((acc_mode & (dac_granted | cap_granted)) ==
147 acc_mode) {
148 if (privused != NULL)
149 *privused = 1;
150 return (0);
151 }
152 goto error;
153
154 case ACL_MASK:
155 acl_mask = &acl->acl_entry[i];
156 break;
157
158 case ACL_OTHER:
159 acl_other = &acl->acl_entry[i];
160 break;
161
162 default:
163 break;
164 }
165 }
166
167 /*
168 * An ACL_OTHER entry should always exist in a valid access
169 * ACL. If it doesn't, then generate a serious failure. For now,
170 * this means a debugging message and EPERM, but in the future
171 * should probably be a panic.
172 */
173 if (acl_other == NULL) {
174 /*
175 * XXX This should never happen
176 */
177 printf("vaccess_acl_posix1e: ACL_OTHER missing\n");
178 return (EPERM);
179 }
180
181 /*
182 * Checks against ACL_USER, ACL_GROUP_OBJ, and ACL_GROUP fields
183 * are masked by an ACL_MASK entry, if any. As such, first identify
184 * the ACL_MASK field, then iterate through identifying potential
185 * user matches, then group matches. If there is no ACL_MASK,
186 * assume that the mask allows all requests to succeed.
187 */
188 if (acl_mask != NULL) {
189 acl_mask_granted = 0;
190 if (acl_mask->ae_perm & ACL_EXECUTE)
191 acl_mask_granted |= VEXEC;
192 if (acl_mask->ae_perm & ACL_READ)
193 acl_mask_granted |= VREAD;
194 if (acl_mask->ae_perm & ACL_WRITE)
195 acl_mask_granted |= (VWRITE | VAPPEND);
196 } else
197 acl_mask_granted = VEXEC | VREAD | VWRITE | VAPPEND;
198
199 /*
200 * Iterate through user ACL entries. Do checks twice, first
201 * without privilege, and then if a match is found but failed,
202 * a second time with privilege.
203 */
204
205 /*
206 * Check ACL_USER ACL entries.
207 */
208 for (i = 0; i < acl->acl_cnt; i++) {
209 switch (acl->acl_entry[i].ae_tag) {
210 case ACL_USER:
211 if (acl->acl_entry[i].ae_id != cred->cr_uid)
212 break;
213 dac_granted = 0;
214 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
215 dac_granted |= VEXEC;
216 if (acl->acl_entry[i].ae_perm & ACL_READ)
217 dac_granted |= VREAD;
218 if (acl->acl_entry[i].ae_perm & ACL_WRITE)
219 dac_granted |= (VWRITE | VAPPEND);
220 dac_granted &= acl_mask_granted;
221 if ((acc_mode & dac_granted) == acc_mode)
222 return (0);
223 if ((acc_mode & (dac_granted | cap_granted)) !=
224 acc_mode)
225 goto error;
226
227 if (privused != NULL)
228 *privused = 1;
229 return (0);
230 }
231 }
232
233 /*
234 * Group match is best-match, not first-match, so find a
235 * "best" match. Iterate across, testing each potential group
236 * match. Make sure we keep track of whether we found a match
237 * or not, so that we know if we should try again with any
238 * available privilege, or if we should move on to ACL_OTHER.
239 */
240 group_matched = 0;
241 for (i = 0; i < acl->acl_cnt; i++) {
242 switch (acl->acl_entry[i].ae_tag) {
243 case ACL_GROUP_OBJ:
244 if (!groupmember(file_gid, cred))
245 break;
246 dac_granted = 0;
247 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
248 dac_granted |= VEXEC;
249 if (acl->acl_entry[i].ae_perm & ACL_READ)
250 dac_granted |= VREAD;
251 if (acl->acl_entry[i].ae_perm & ACL_WRITE)
252 dac_granted |= (VWRITE | VAPPEND);
253 dac_granted &= acl_mask_granted;
254
255 if ((acc_mode & dac_granted) == acc_mode)
256 return (0);
257
258 group_matched = 1;
259 break;
260
261 case ACL_GROUP:
262 if (!groupmember(acl->acl_entry[i].ae_id, cred))
263 break;
264 dac_granted = 0;
265 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
266 dac_granted |= VEXEC;
267 if (acl->acl_entry[i].ae_perm & ACL_READ)
268 dac_granted |= VREAD;
269 if (acl->acl_entry[i].ae_perm & ACL_WRITE)
270 dac_granted |= (VWRITE | VAPPEND);
271 dac_granted &= acl_mask_granted;
272
273 if ((acc_mode & dac_granted) == acc_mode)
274 return (0);
275
276 group_matched = 1;
277 break;
278
279 default:
280 break;
281 }
282 }
283
284 if (group_matched == 1) {
285 /*
286 * There was a match, but it did not grant rights via
287 * pure DAC. Try again, this time with privilege.
288 */
289 for (i = 0; i < acl->acl_cnt; i++) {
290 switch (acl->acl_entry[i].ae_tag) {
291 case ACL_GROUP_OBJ:
292 if (!groupmember(file_gid, cred))
293 break;
294 dac_granted = 0;
295 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
296 dac_granted |= VEXEC;
297 if (acl->acl_entry[i].ae_perm & ACL_READ)
298 dac_granted |= VREAD;
299 if (acl->acl_entry[i].ae_perm & ACL_WRITE)
300 dac_granted |= (VWRITE | VAPPEND);
301 dac_granted &= acl_mask_granted;
302
303 if ((acc_mode & (dac_granted | cap_granted)) !=
304 acc_mode)
305 break;
306
307 if (privused != NULL)
308 *privused = 1;
309 return (0);
310
311 case ACL_GROUP:
312 if (!groupmember(acl->acl_entry[i].ae_id,
313 cred))
314 break;
315 dac_granted = 0;
316 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
317 dac_granted |= VEXEC;
318 if (acl->acl_entry[i].ae_perm & ACL_READ)
319 dac_granted |= VREAD;
320 if (acl->acl_entry[i].ae_perm & ACL_WRITE)
321 dac_granted |= (VWRITE | VAPPEND);
322 dac_granted &= acl_mask_granted;
323
324 if ((acc_mode & (dac_granted | cap_granted)) !=
325 acc_mode)
326 break;
327
328 if (privused != NULL)
329 *privused = 1;
330 return (0);
331
332 default:
333 break;
334 }
335 }
336 /*
337 * Even with privilege, group membership was not sufficient.
338 * Return failure.
339 */
340 goto error;
341 }
342
343 /*
344 * Fall back on ACL_OTHER. ACL_MASK is not applied to ACL_OTHER.
345 */
346 dac_granted = 0;
347 if (acl_other->ae_perm & ACL_EXECUTE)
348 dac_granted |= VEXEC;
349 if (acl_other->ae_perm & ACL_READ)
350 dac_granted |= VREAD;
351 if (acl_other->ae_perm & ACL_WRITE)
352 dac_granted |= (VWRITE | VAPPEND);
353
354 if ((acc_mode & dac_granted) == acc_mode)
355 return (0);
356 if ((acc_mode & (dac_granted | cap_granted)) == acc_mode) {
357 if (privused != NULL)
358 *privused = 1;
359 return (0);
360 }
361
362 error:
363 return ((acc_mode & VADMIN) ? EPERM : EACCES);
364 }
365
366 /*
367 * For the purposes of filesystems maintaining the _OBJ entries in an
368 * inode with a mode_t field, this routine converts a mode_t entry
369 * to an acl_perm_t.
370 */
371 acl_perm_t
372 acl_posix1e_mode_to_perm(acl_tag_t tag, mode_t mode)
373 {
374 acl_perm_t perm = 0;
375
376 switch(tag) {
377 case ACL_USER_OBJ:
378 if (mode & S_IXUSR)
379 perm |= ACL_EXECUTE;
380 if (mode & S_IRUSR)
381 perm |= ACL_READ;
382 if (mode & S_IWUSR)
383 perm |= ACL_WRITE;
384 return (perm);
385
386 case ACL_GROUP_OBJ:
387 if (mode & S_IXGRP)
388 perm |= ACL_EXECUTE;
389 if (mode & S_IRGRP)
390 perm |= ACL_READ;
391 if (mode & S_IWGRP)
392 perm |= ACL_WRITE;
393 return (perm);
394
395 case ACL_OTHER:
396 if (mode & S_IXOTH)
397 perm |= ACL_EXECUTE;
398 if (mode & S_IROTH)
399 perm |= ACL_READ;
400 if (mode & S_IWOTH)
401 perm |= ACL_WRITE;
402 return (perm);
403
404 default:
405 printf("acl_posix1e_mode_to_perm: invalid tag (%d)\n", tag);
406 return (0);
407 }
408 }
409
410 /*
411 * Given inode information (uid, gid, mode), return an acl entry of the
412 * appropriate type.
413 */
414 struct acl_entry
415 acl_posix1e_mode_to_entry(acl_tag_t tag, uid_t uid, gid_t gid, mode_t mode)
416 {
417 struct acl_entry acl_entry;
418
419 acl_entry.ae_tag = tag;
420 acl_entry.ae_perm = acl_posix1e_mode_to_perm(tag, mode);
421 switch(tag) {
422 case ACL_USER_OBJ:
423 acl_entry.ae_id = uid;
424 break;
425
426 case ACL_GROUP_OBJ:
427 acl_entry.ae_id = gid;
428 break;
429
430 case ACL_OTHER:
431 acl_entry.ae_id = ACL_UNDEFINED_ID;
432 break;
433
434 default:
435 acl_entry.ae_id = ACL_UNDEFINED_ID;
436 printf("acl_posix1e_mode_to_entry: invalid tag (%d)\n", tag);
437 }
438
439 return (acl_entry);
440 }
441
442 /*
443 * Utility function to generate a file mode given appropriate ACL entries.
444 */
445 mode_t
446 acl_posix1e_perms_to_mode(struct acl_entry *acl_user_obj_entry,
447 struct acl_entry *acl_group_obj_entry, struct acl_entry *acl_other_entry)
448 {
449 mode_t mode;
450
451 mode = 0;
452 if (acl_user_obj_entry->ae_perm & ACL_EXECUTE)
453 mode |= S_IXUSR;
454 if (acl_user_obj_entry->ae_perm & ACL_READ)
455 mode |= S_IRUSR;
456 if (acl_user_obj_entry->ae_perm & ACL_WRITE)
457 mode |= S_IWUSR;
458 if (acl_group_obj_entry->ae_perm & ACL_EXECUTE)
459 mode |= S_IXGRP;
460 if (acl_group_obj_entry->ae_perm & ACL_READ)
461 mode |= S_IRGRP;
462 if (acl_group_obj_entry->ae_perm & ACL_WRITE)
463 mode |= S_IWGRP;
464 if (acl_other_entry->ae_perm & ACL_EXECUTE)
465 mode |= S_IXOTH;
466 if (acl_other_entry->ae_perm & ACL_READ)
467 mode |= S_IROTH;
468 if (acl_other_entry->ae_perm & ACL_WRITE)
469 mode |= S_IWOTH;
470
471 return (mode);
472 }
473
474 /*
475 * Perform a syntactic check of the ACL, sufficient to allow an
476 * implementing filesystem to determine if it should accept this and
477 * rely on the POSIX.1e ACL properties.
478 */
479 int
480 acl_posix1e_check(struct acl *acl)
481 {
482 int num_acl_user_obj, num_acl_user, num_acl_group_obj, num_acl_group;
483 int num_acl_mask, num_acl_other, i;
484
485 /*
486 * Verify that the number of entries does not exceed the maximum
487 * defined for acl_t.
488 * Verify that the correct number of various sorts of ae_tags are
489 * present:
490 * Exactly one ACL_USER_OBJ
491 * Exactly one ACL_GROUP_OBJ
492 * Exactly one ACL_OTHER
493 * If any ACL_USER or ACL_GROUP entries appear, then exactly one
494 * ACL_MASK entry must also appear.
495 * Verify that all ae_perm entries are in ACL_PERM_BITS.
496 * Verify all ae_tag entries are understood by this implementation.
497 * Note: Does not check for uniqueness of qualifier (ae_id) field.
498 */
499 num_acl_user_obj = num_acl_user = num_acl_group_obj = num_acl_group =
500 num_acl_mask = num_acl_other = 0;
501 if (acl->acl_cnt > ACL_MAX_ENTRIES || acl->acl_cnt < 0)
502 return (EINVAL);
503 for (i = 0; i < acl->acl_cnt; i++) {
504 /*
505 * Check for a valid tag.
506 */
507 switch(acl->acl_entry[i].ae_tag) {
508 case ACL_USER_OBJ:
509 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */
510 if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID)
511 return (EINVAL);
512 num_acl_user_obj++;
513 break;
514 case ACL_GROUP_OBJ:
515 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */
516 if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID)
517 return (EINVAL);
518 num_acl_group_obj++;
519 break;
520 case ACL_USER:
521 if (acl->acl_entry[i].ae_id == ACL_UNDEFINED_ID)
522 return (EINVAL);
523 num_acl_user++;
524 break;
525 case ACL_GROUP:
526 if (acl->acl_entry[i].ae_id == ACL_UNDEFINED_ID)
527 return (EINVAL);
528 num_acl_group++;
529 break;
530 case ACL_OTHER:
531 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */
532 if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID)
533 return (EINVAL);
534 num_acl_other++;
535 break;
536 case ACL_MASK:
537 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */
538 if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID)
539 return (EINVAL);
540 num_acl_mask++;
541 break;
542 default:
543 return (EINVAL);
544 }
545 /*
546 * Check for valid perm entries.
547 */
548 if ((acl->acl_entry[i].ae_perm | ACL_PERM_BITS) !=
549 ACL_PERM_BITS)
550 return (EINVAL);
551 }
552 if ((num_acl_user_obj != 1) || (num_acl_group_obj != 1) ||
553 (num_acl_other != 1) || (num_acl_mask != 0 && num_acl_mask != 1))
554 return (EINVAL);
555 if (((num_acl_group != 0) || (num_acl_user != 0)) &&
556 (num_acl_mask != 1))
557 return (EINVAL);
558 return (0);
559 }
560
561 /*
562 * These calls wrap the real vnode operations, and are called by the
563 * syscall code once the syscall has converted the path or file
564 * descriptor to a vnode (unlocked). The aclp pointer is assumed
565 * still to point to userland, so this should not be consumed within
566 * the kernel except by syscall code. Other code should directly
567 * invoke VOP_{SET,GET}ACL.
568 */
569
570 /*
571 * Given a vnode, set its ACL.
572 */
573 static int
574 vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type,
575 struct acl *aclp)
576 {
577 struct acl inkernacl;
578 struct mount *mp;
579 int error;
580
581 error = copyin(aclp, &inkernacl, sizeof(struct acl));
582 if (error)
583 return(error);
584 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
585 if (error != 0)
586 return (error);
587 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
588 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
589 #ifdef MAC
590 error = mac_check_vnode_setacl(td->td_ucred, vp, type, &inkernacl);
591 if (error != 0)
592 goto out;
593 #endif
594 error = VOP_SETACL(vp, type, &inkernacl, td->td_ucred, td);
595 #ifdef MAC
596 out:
597 #endif
598 VOP_UNLOCK(vp, 0, td);
599 vn_finished_write(mp);
600 return(error);
601 }
602
603 /*
604 * Given a vnode, get its ACL.
605 */
606 static int
607 vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type,
608 struct acl *aclp)
609 {
610 struct acl inkernelacl;
611 int error;
612
613 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
614 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
615 #ifdef MAC
616 error = mac_check_vnode_getacl(td->td_ucred, vp, type);
617 if (error != 0)
618 goto out;
619 #endif
620 error = VOP_GETACL(vp, type, &inkernelacl, td->td_ucred, td);
621 #ifdef MAC
622 out:
623 #endif
624 VOP_UNLOCK(vp, 0, td);
625 if (error == 0)
626 error = copyout(&inkernelacl, aclp, sizeof(struct acl));
627 return (error);
628 }
629
630 /*
631 * Given a vnode, delete its ACL.
632 */
633 static int
634 vacl_delete(struct thread *td, struct vnode *vp, acl_type_t type)
635 {
636 struct mount *mp;
637 int error;
638
639 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
640 if (error)
641 return (error);
642 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
643 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
644 #ifdef MAC
645 error = mac_check_vnode_deleteacl(td->td_ucred, vp, type);
646 if (error)
647 goto out;
648 #endif
649 error = VOP_SETACL(vp, type, 0, td->td_ucred, td);
650 #ifdef MAC
651 out:
652 #endif
653 VOP_UNLOCK(vp, 0, td);
654 vn_finished_write(mp);
655 return (error);
656 }
657
658 /*
659 * Given a vnode, check whether an ACL is appropriate for it
660 */
661 static int
662 vacl_aclcheck(struct thread *td, struct vnode *vp, acl_type_t type,
663 struct acl *aclp)
664 {
665 struct acl inkernelacl;
666 int error;
667
668 error = copyin(aclp, &inkernelacl, sizeof(struct acl));
669 if (error)
670 return(error);
671 error = VOP_ACLCHECK(vp, type, &inkernelacl, td->td_ucred, td);
672 return (error);
673 }
674
675 /*
676 * syscalls -- convert the path/fd to a vnode, and call vacl_whatever.
677 * Don't need to lock, as the vacl_ code will get/release any locks
678 * required.
679 */
680
681 /*
682 * Given a file path, get an ACL for it
683 *
684 * MPSAFE
685 */
686 int
687 __acl_get_file(struct thread *td, struct __acl_get_file_args *uap)
688 {
689 struct nameidata nd;
690 int error;
691
692 mtx_lock(&Giant);
693 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
694 error = namei(&nd);
695 if (error == 0) {
696 error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
697 NDFREE(&nd, 0);
698 }
699 mtx_unlock(&Giant);
700 return (error);
701 }
702
703 /*
704 * Given a file path, get an ACL for it; don't follow links.
705 *
706 * MPSAFE
707 */
708 int
709 __acl_get_link(struct thread *td, struct __acl_get_link_args *uap)
710 {
711 struct nameidata nd;
712 int error;
713
714 mtx_lock(&Giant);
715 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
716 error = namei(&nd);
717 if (error == 0) {
718 error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
719 NDFREE(&nd, 0);
720 }
721 mtx_unlock(&Giant);
722 return (error);
723 }
724
725 /*
726 * Given a file path, set an ACL for it
727 *
728 * MPSAFE
729 */
730 int
731 __acl_set_file(struct thread *td, struct __acl_set_file_args *uap)
732 {
733 struct nameidata nd;
734 int error;
735
736 mtx_lock(&Giant);
737 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
738 error = namei(&nd);
739 if (error == 0) {
740 error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
741 NDFREE(&nd, 0);
742 }
743 mtx_unlock(&Giant);
744 return (error);
745 }
746
747 /*
748 * Given a file path, set an ACL for it; don't follow links.
749 *
750 * MPSAFE
751 */
752 int
753 __acl_set_link(struct thread *td, struct __acl_set_link_args *uap)
754 {
755 struct nameidata nd;
756 int error;
757
758 mtx_lock(&Giant);
759 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
760 error = namei(&nd);
761 if (error == 0) {
762 error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
763 NDFREE(&nd, 0);
764 }
765 mtx_unlock(&Giant);
766 return (error);
767 }
768
769 /*
770 * Given a file descriptor, get an ACL for it
771 *
772 * MPSAFE
773 */
774 int
775 __acl_get_fd(struct thread *td, struct __acl_get_fd_args *uap)
776 {
777 struct file *fp;
778 int error;
779
780 mtx_lock(&Giant);
781 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
782 if (error == 0) {
783 error = vacl_get_acl(td, fp->f_data, uap->type, uap->aclp);
784 fdrop(fp, td);
785 }
786 mtx_unlock(&Giant);
787 return (error);
788 }
789
790 /*
791 * Given a file descriptor, set an ACL for it
792 *
793 * MPSAFE
794 */
795 int
796 __acl_set_fd(struct thread *td, struct __acl_set_fd_args *uap)
797 {
798 struct file *fp;
799 int error;
800
801 mtx_lock(&Giant);
802 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
803 if (error == 0) {
804 error = vacl_set_acl(td, fp->f_data, uap->type, uap->aclp);
805 fdrop(fp, td);
806 }
807 mtx_unlock(&Giant);
808 return (error);
809 }
810
811 /*
812 * Given a file path, delete an ACL from it.
813 *
814 * MPSAFE
815 */
816 int
817 __acl_delete_file(struct thread *td, struct __acl_delete_file_args *uap)
818 {
819 struct nameidata nd;
820 int error;
821
822 mtx_lock(&Giant);
823 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
824 error = namei(&nd);
825 if (error == 0) {
826 error = vacl_delete(td, nd.ni_vp, uap->type);
827 NDFREE(&nd, 0);
828 }
829 mtx_unlock(&Giant);
830 return (error);
831 }
832
833 /*
834 * Given a file path, delete an ACL from it; don't follow links.
835 *
836 * MPSAFE
837 */
838 int
839 __acl_delete_link(struct thread *td, struct __acl_delete_link_args *uap)
840 {
841 struct nameidata nd;
842 int error;
843
844 mtx_lock(&Giant);
845 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
846 error = namei(&nd);
847 if (error == 0) {
848 error = vacl_delete(td, nd.ni_vp, uap->type);
849 NDFREE(&nd, 0);
850 }
851 mtx_unlock(&Giant);
852 return (error);
853 }
854
855 /*
856 * Given a file path, delete an ACL from it.
857 *
858 * MPSAFE
859 */
860 int
861 __acl_delete_fd(struct thread *td, struct __acl_delete_fd_args *uap)
862 {
863 struct file *fp;
864 int error;
865
866 mtx_lock(&Giant);
867 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
868 if (error == 0) {
869 error = vacl_delete(td, fp->f_data, uap->type);
870 fdrop(fp, td);
871 }
872 mtx_unlock(&Giant);
873 return (error);
874 }
875
876 /*
877 * Given a file path, check an ACL for it
878 *
879 * MPSAFE
880 */
881 int
882 __acl_aclcheck_file(struct thread *td, struct __acl_aclcheck_file_args *uap)
883 {
884 struct nameidata nd;
885 int error;
886
887 mtx_lock(&Giant);
888 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
889 error = namei(&nd);
890 if (error == 0) {
891 error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
892 NDFREE(&nd, 0);
893 }
894 mtx_unlock(&Giant);
895 return (error);
896 }
897
898 /*
899 * Given a file path, check an ACL for it; don't follow links.
900 *
901 * MPSAFE
902 */
903 int
904 __acl_aclcheck_link(struct thread *td, struct __acl_aclcheck_link_args *uap)
905 {
906 struct nameidata nd;
907 int error;
908
909 mtx_lock(&Giant);
910 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
911 error = namei(&nd);
912 if (error == 0) {
913 error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
914 NDFREE(&nd, 0);
915 }
916 mtx_unlock(&Giant);
917 return (error);
918 }
919
920 /*
921 * Given a file descriptor, check an ACL for it
922 *
923 * MPSAFE
924 */
925 int
926 __acl_aclcheck_fd(struct thread *td, struct __acl_aclcheck_fd_args *uap)
927 {
928 struct file *fp;
929 int error;
930
931 mtx_lock(&Giant);
932 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
933 if (error == 0) {
934 error = vacl_aclcheck(td, fp->f_data, uap->type, uap->aclp);
935 fdrop(fp, td);
936 }
937 mtx_unlock(&Giant);
938 return (error);
939 }
Cache object: 6f0298506a8f19e2702799a69c079148
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