source: vendor/current/source3/modules/onefs_acl.c@ 590

Last change on this file since 590 was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 24.9 KB
Line 
1/*
2 * Unix SMB/CIFS implementation.
3 *
4 * Support for OneFS native NTFS ACLs
5 *
6 * Copyright (C) Steven Danneman, 2008
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include "includes.h"
23#include "onefs.h"
24#include "onefs_config.h"
25
26#include <isi_acl/isi_acl_util.h>
27#include <ifs/ifs_syscalls.h>
28#include <sys/isi_acl.h>
29
30const struct enum_list enum_onefs_acl_wire_format[] = {
31 {ACL_FORMAT_RAW, "No Format"},
32 {ACL_FORMAT_WINDOWS_SD, "Format Windows SD"},
33 {ACL_FORMAT_ALWAYS, "Always Format SD"},
34 {-1, NULL}
35};
36
37/**
38 * Turn SID into UID/GID and setup a struct ifs_identity
39 */
40static bool
41onefs_sid_to_identity(const DOM_SID *sid, struct ifs_identity *id,
42 bool is_group)
43{
44 enum ifs_identity_type type = IFS_ID_TYPE_LAST+1;
45 uid_t uid = 0;
46 gid_t gid = 0;
47
48 if (!sid || sid_equal(sid, &global_sid_NULL))
49 type = IFS_ID_TYPE_NULL;
50 else if (sid_equal(sid, &global_sid_World))
51 type = IFS_ID_TYPE_EVERYONE;
52 else if (sid_equal(sid, &global_sid_Creator_Owner))
53 type = IFS_ID_TYPE_CREATOR_OWNER;
54 else if (sid_equal(sid, &global_sid_Creator_Group))
55 type = IFS_ID_TYPE_CREATOR_GROUP;
56 else if (is_group) {
57 if (!sid_to_gid(sid, &gid))
58 return false;
59 type = IFS_ID_TYPE_GID;
60 } else {
61 if (sid_to_uid(sid, &uid))
62 type = IFS_ID_TYPE_UID;
63 else if (sid_to_gid(sid, &gid))
64 type = IFS_ID_TYPE_GID;
65 else
66 return false;
67 }
68
69 if (aclu_initialize_identity(id, type, uid, gid, is_group)) {
70 DEBUG(3, ("Call to aclu_initialize_identity failed! id=%x, "
71 "type=%d, uid=%u, gid=%u, is_group=%d\n",
72 (unsigned int)id, type, uid, gid, is_group));
73 return false;
74 }
75
76 return true;
77}
78
79/**
80 * Turn struct ifs_identity into SID
81 */
82static bool
83onefs_identity_to_sid(struct ifs_identity *id, DOM_SID *sid)
84{
85 if (!id || !sid)
86 return false;
87
88 if (id->type >= IFS_ID_TYPE_LAST)
89 return false;
90
91 switch (id->type) {
92 case IFS_ID_TYPE_UID:
93 uid_to_sid(sid, id->id.uid);
94 break;
95 case IFS_ID_TYPE_GID:
96 gid_to_sid(sid, id->id.gid);
97 break;
98 case IFS_ID_TYPE_EVERYONE:
99 sid_copy(sid, &global_sid_World);
100 break;
101 case IFS_ID_TYPE_NULL:
102 sid_copy(sid, &global_sid_NULL);
103 break;
104 case IFS_ID_TYPE_CREATOR_OWNER:
105 sid_copy(sid, &global_sid_Creator_Owner);
106 break;
107 case IFS_ID_TYPE_CREATOR_GROUP:
108 sid_copy(sid, &global_sid_Creator_Group);
109 break;
110 default:
111 DEBUG(0, ("Unknown identity type: %d\n", id->type));
112 return false;
113 }
114
115 return true;
116}
117
118static bool
119onefs_og_to_identity(DOM_SID *sid, struct ifs_identity * ident,
120 bool is_group, int snum)
121{
122 const DOM_SID *b_admin_sid = &global_sid_Builtin_Administrators;
123
124 if (!onefs_sid_to_identity(sid, ident, is_group)) {
125 if (!lp_parm_bool(snum, PARM_ONEFS_TYPE,
126 PARM_UNMAPPABLE_SIDS_IGNORE,
127 PARM_UNMAPPABLE_SIDS_IGNORE_DEFAULT)) {
128 DEBUG(3, ("Unresolvable SID (%s) found.\n",
129 sid_string_dbg(sid)));
130 return false;
131 }
132 if (!onefs_sid_to_identity(b_admin_sid, ident, is_group)) {
133 return false;
134 }
135 DEBUG(3, ("Mapping unresolvable owner SID (%s) to Builtin "
136 "Administrators group.\n",
137 sid_string_dbg(sid)));
138 }
139 return true;
140}
141
142static bool
143sid_in_ignore_list(DOM_SID * sid, int snum)
144{
145 const char ** sid_list = NULL;
146 DOM_SID match;
147
148 sid_list = lp_parm_string_list(snum, PARM_ONEFS_TYPE,
149 PARM_UNMAPPABLE_SIDS_IGNORE_LIST,
150 PARM_UNMAPPABLE_SIDS_IGNORE_LIST_DEFAULT);
151
152 /* Fast path a NULL list */
153 if (!sid_list || *sid_list == NULL)
154 return false;
155
156 while (*sid_list) {
157 if (string_to_sid(&match, *sid_list))
158 if (sid_equal(sid, &match))
159 return true;
160 sid_list++;
161 }
162
163 return false;
164}
165
166/**
167 * Convert a trustee to a struct identity
168 */
169static bool
170onefs_samba_ace_to_ace(SEC_ACE * samba_ace, struct ifs_ace * ace,
171 bool *mapped, int snum)
172{
173 struct ifs_identity ident = {.type=IFS_ID_TYPE_LAST, .id.uid=0};
174
175 SMB_ASSERT(ace);
176 SMB_ASSERT(mapped);
177 SMB_ASSERT(samba_ace);
178
179 if (onefs_sid_to_identity(&samba_ace->trustee, &ident, false)) {
180 *mapped = true;
181 } else {
182
183 SMB_ASSERT(ident.id.uid >= 0);
184
185 /* Ignore the sid if it's in the list */
186 if (sid_in_ignore_list(&samba_ace->trustee, snum)) {
187 DEBUG(3, ("Silently failing to set ACE for SID (%s) "
188 "because it is in the ignore sids list\n",
189 sid_string_dbg(&samba_ace->trustee)));
190 *mapped = false;
191 } else if ((samba_ace->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
192 lp_parm_bool(snum, PARM_ONEFS_TYPE,
193 PARM_UNMAPPABLE_SIDS_DENY_EVERYONE,
194 PARM_UNMAPPABLE_SIDS_DENY_EVERYONE_DEFAULT)) {
195 /* If the ace is deny translated to Everyone */
196 DEBUG(3, ("Mapping unresolvable deny ACE SID (%s) "
197 "to Everyone.\n",
198 sid_string_dbg(&samba_ace->trustee)));
199 if (aclu_initialize_identity(&ident,
200 IFS_ID_TYPE_EVERYONE, 0, 0, False) != 0) {
201 DEBUG(2, ("aclu_initialize_identity() "
202 "failed making Everyone\n"));
203 return false;
204 }
205 *mapped = true;
206 } else if (lp_parm_bool(snum, PARM_ONEFS_TYPE,
207 PARM_UNMAPPABLE_SIDS_IGNORE,
208 PARM_UNMAPPABLE_SIDS_IGNORE_DEFAULT)) {
209 DEBUG(3, ("Silently failing to set ACE for SID (%s) "
210 "because it is unresolvable\n",
211 sid_string_dbg(&samba_ace->trustee)));
212 *mapped = false;
213 } else {
214 /* Fail for lack of a better option */
215 return false;
216 }
217 }
218
219 if (*mapped) {
220 if (aclu_initialize_ace(ace, samba_ace->type,
221 samba_ace->access_mask, samba_ace->flags, 0,
222 &ident))
223 return false;
224
225 if ((ace->trustee.type == IFS_ID_TYPE_CREATOR_OWNER ||
226 ace->trustee.type == IFS_ID_TYPE_CREATOR_GROUP) &&
227 nt4_compatible_acls())
228 ace->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
229 }
230
231 return true;
232}
233
234/**
235 * Convert a SEC_ACL to a struct ifs_security_acl
236 */
237static bool
238onefs_samba_acl_to_acl(SEC_ACL *samba_acl, struct ifs_security_acl **acl,
239 bool * ignore_aces, int snum)
240{
241 int num_aces = 0;
242 struct ifs_ace *aces = NULL;
243 SEC_ACE *samba_aces;
244 bool mapped;
245 int i, j;
246
247 SMB_ASSERT(ignore_aces);
248
249 if ((!acl) || (!samba_acl))
250 return false;
251
252 samba_aces = samba_acl->aces;
253
254 if (samba_acl->num_aces > 0 && samba_aces) {
255 /* Setup ACES */
256 num_aces = samba_acl->num_aces;
257 aces = SMB_MALLOC_ARRAY(struct ifs_ace, num_aces);
258
259 for (i = 0, j = 0; j < num_aces; i++, j++) {
260 if (!onefs_samba_ace_to_ace(&samba_aces[j],
261 &aces[i], &mapped, snum))
262 goto err_free;
263
264 if (!mapped)
265 i--;
266 }
267 num_aces = i;
268 }
269
270 /* If aces are given but we cannot apply them due to the reasons
271 * above we do not change the SD. However, if we are told to
272 * explicitly set an SD with 0 aces we honor this operation */
273 *ignore_aces = samba_acl->num_aces > 0 && num_aces < 1;
274
275 if (*ignore_aces == false)
276 if (aclu_initialize_acl(acl, aces, num_aces))
277 goto err_free;
278
279 /* Currently aclu_initialize_acl should copy the aces over, allowing
280 * us to immediately free */
281 free(aces);
282 return true;
283
284err_free:
285 free(aces);
286 return false;
287}
288
289/**
290 * Convert a struct ifs_security_acl to a SEC_ACL
291 */
292static bool
293onefs_acl_to_samba_acl(struct ifs_security_acl *acl, SEC_ACL **samba_acl)
294{
295 SEC_ACE *samba_aces = NULL;
296 SEC_ACL *tmp_samba_acl = NULL;
297 int i, num_aces = 0;
298
299 if (!samba_acl)
300 return false;
301
302 /* NULL ACL */
303 if (!acl) {
304 *samba_acl = NULL;
305 return true;
306 }
307
308 /* Determine number of aces in ACL */
309 if (!acl->aces)
310 num_aces = 0;
311 else
312 num_aces = acl->num_aces;
313
314 /* Allocate the ace list. */
315 if (num_aces > 0) {
316 if ((samba_aces = SMB_MALLOC_ARRAY(SEC_ACE, num_aces)) == NULL)
317 {
318 DEBUG(0, ("Unable to malloc space for %d aces.\n",
319 num_aces));
320 return false;
321 }
322 memset(samba_aces, '\0', (num_aces) * sizeof(SEC_ACE));
323 }
324
325 for (i = 0; i < num_aces; i++) {
326 DOM_SID sid;
327
328 if (!onefs_identity_to_sid(&acl->aces[i].trustee, &sid))
329 goto err_free;
330
331 init_sec_ace(&samba_aces[i], &sid, acl->aces[i].type,
332 acl->aces[i].access_mask, acl->aces[i].flags);
333 }
334
335 if ((tmp_samba_acl = make_sec_acl(talloc_tos(), acl->revision, num_aces,
336 samba_aces)) == NULL) {
337 DEBUG(0, ("Unable to malloc space for acl.\n"));
338 goto err_free;
339 }
340
341 *samba_acl = tmp_samba_acl;
342 SAFE_FREE(samba_aces);
343 return true;
344err_free:
345 SAFE_FREE(samba_aces);
346 return false;
347}
348
349/**
350 * @brief Reorder ACLs into the "correct" order for Windows Explorer.
351 *
352 * Windows Explorer expects ACLs to be in a standard order (inherited first,
353 * then deny, then permit.) When ACLs are composed from POSIX file permissions
354 * bits, they may not match these expectations, generating an annoying warning
355 * dialog for the user. This function will, if configured appropriately,
356 * reorder the ACLs for these "synthetic" (POSIX-derived) descriptors to prevent
357 * this. The list is changed within the security descriptor passed in.
358 *
359 * @param fsp files_struct with service configs; must not be NULL
360 * @param sd security descriptor being normalized;
361 * sd->dacl->aces is rewritten in-place, so must not be NULL
362 * @return true on success, errno will be set on error
363 *
364 * @bug Although Windows Explorer likes the reordering, they seem to cause
365 * problems with Excel and Word sending back the reordered ACLs to us and
366 * changing policy; see Isilon bug 30165.
367 */
368static bool
369onefs_canon_acl(files_struct *fsp, struct ifs_security_descriptor *sd)
370{
371 int error = 0;
372 int cur;
373 struct ifs_ace *new_aces = NULL;
374 int new_aces_count = 0;
375 SMB_STRUCT_STAT sbuf;
376
377 if (sd == NULL || sd->dacl == NULL || sd->dacl->num_aces == 0)
378 return true;
379
380 /*
381 * Find out if this is a windows bit, and if the smb policy wants us to
382 * lie about the sd.
383 */
384 SMB_ASSERT(fsp != NULL);
385 switch (lp_parm_enum(SNUM(fsp->conn), PARM_ONEFS_TYPE,
386 PARM_ACL_WIRE_FORMAT, enum_onefs_acl_wire_format,
387 PARM_ACL_WIRE_FORMAT_DEFAULT)) {
388 case ACL_FORMAT_RAW:
389 return true;
390
391 case ACL_FORMAT_WINDOWS_SD:
392 error = SMB_VFS_FSTAT(fsp, &sbuf);
393 if (error)
394 return false;
395
396 if ((sbuf.st_ex_flags & SF_HASNTFSACL) != 0) {
397 DEBUG(10, ("Did not canonicalize ACLs because a "
398 "Windows ACL set was found for file %s\n",
399 fsp_str_dbg(fsp)));
400 return true;
401 }
402 break;
403
404 case ACL_FORMAT_ALWAYS:
405 break;
406
407 default:
408 SMB_ASSERT(false);
409 return false;
410 }
411
412 new_aces = SMB_MALLOC_ARRAY(struct ifs_ace, sd->dacl->num_aces);
413 if (new_aces == NULL)
414 return false;
415
416 /*
417 * By walking down the list 3 separate times, we can avoid the need
418 * to create multiple temp buffers and extra copies.
419 */
420
421 /* Explict deny aces first */
422 for (cur = 0; cur < sd->dacl->num_aces; cur++) {
423 if (!(sd->dacl->aces[cur].flags & IFS_ACE_FLAG_INHERITED_ACE) &&
424 (sd->dacl->aces[cur].type == IFS_ACE_TYPE_ACCESS_DENIED))
425 new_aces[new_aces_count++] = sd->dacl->aces[cur];
426 }
427
428 /* Explict allow aces second */
429 for (cur = 0; cur < sd->dacl->num_aces; cur++) {
430 if (!(sd->dacl->aces[cur].flags & IFS_ACE_FLAG_INHERITED_ACE) &&
431 !(sd->dacl->aces[cur].type == IFS_ACE_TYPE_ACCESS_DENIED))
432 new_aces[new_aces_count++] = sd->dacl->aces[cur];
433 }
434
435 /* Inherited deny/allow aces third */
436 for (cur = 0; cur < sd->dacl->num_aces; cur++) {
437 if ((sd->dacl->aces[cur].flags & IFS_ACE_FLAG_INHERITED_ACE))
438 new_aces[new_aces_count++] = sd->dacl->aces[cur];
439 }
440
441 SMB_ASSERT(new_aces_count == sd->dacl->num_aces);
442 DEBUG(10, ("Performed canonicalization of ACLs for file %s\n",
443 fsp_str_dbg(fsp)));
444
445 /*
446 * At this point you would think we could just do this:
447 * SAFE_FREE(sd->dacl->aces);
448 * sd->dacl->aces = new_aces;
449 * However, in some cases the existing aces pointer does not point
450 * to the beginning of an allocated block. So we have to do a more
451 * expensive memcpy()
452 */
453 memcpy(sd->dacl->aces, new_aces,
454 sizeof(struct ifs_ace) * new_aces_count);
455
456 SAFE_FREE(new_aces);
457 return true;
458}
459
460
461/**
462 * This enum is a helper for onefs_fget_nt_acl() to communicate with
463 * onefs_init_ace().
464 */
465enum mode_ident { USR, GRP, OTH };
466
467/**
468 * Initializes an ACE for addition to a synthetic ACL.
469 */
470static struct ifs_ace onefs_init_ace(struct connection_struct *conn,
471 mode_t mode,
472 bool isdir,
473 enum mode_ident ident)
474{
475 struct ifs_ace result;
476 enum ifs_ace_rights r,w,x;
477
478 r = isdir ? UNIX_DIRECTORY_ACCESS_R : UNIX_ACCESS_R;
479 w = isdir ? UNIX_DIRECTORY_ACCESS_W : UNIX_ACCESS_W;
480 x = isdir ? UNIX_DIRECTORY_ACCESS_X : UNIX_ACCESS_X;
481
482 result.type = IFS_ACE_TYPE_ACCESS_ALLOWED;
483 result.ifs_flags = 0;
484 result.flags = isdir ? IFS_ACE_FLAG_CONTAINER_INHERIT :
485 IFS_ACE_FLAG_OBJECT_INHERIT;
486 result.flags |= IFS_ACE_FLAG_INHERIT_ONLY;
487
488 switch (ident) {
489 case USR:
490 result.access_mask =
491 ((mode & S_IRUSR) ? r : 0 ) |
492 ((mode & S_IWUSR) ? w : 0 ) |
493 ((mode & S_IXUSR) ? x : 0 );
494 if (lp_parm_bool(SNUM(conn), PARM_ONEFS_TYPE,
495 PARM_CREATOR_OWNER_GETS_FULL_CONTROL,
496 PARM_CREATOR_OWNER_GETS_FULL_CONTROL_DEFAULT))
497 result.access_mask |= GENERIC_ALL_ACCESS;
498 result.trustee.type = IFS_ID_TYPE_CREATOR_OWNER;
499 break;
500 case GRP:
501 result.access_mask =
502 ((mode & S_IRGRP) ? r : 0 ) |
503 ((mode & S_IWGRP) ? w : 0 ) |
504 ((mode & S_IXGRP) ? x : 0 );
505 result.trustee.type = IFS_ID_TYPE_CREATOR_GROUP;
506 break;
507 case OTH:
508 result.access_mask =
509 ((mode & S_IROTH) ? r : 0 ) |
510 ((mode & S_IWOTH) ? w : 0 ) |
511 ((mode & S_IXOTH) ? x : 0 );
512 result.trustee.type = IFS_ID_TYPE_EVERYONE;
513 break;
514 }
515
516 return result;
517}
518
519/**
520 * This adds inheritable ACEs to the end of the DACL, with the ACEs
521 * being derived from the mode bits. This is useful for clients that have the
522 * MoveSecurityAttributes regkey set to 0 or are in Simple File Sharing Mode.
523 *
524 * On these clients, when copying files from one folder to another inside the
525 * same volume/share, the DACL is explicitely cleared. Without inheritable
526 * aces on the target folder the mode bits of the copied file are set to 000.
527 *
528 * See Isilon Bug 27990
529 *
530 * Note: This function allocates additional memory onto sd->dacl->aces, that
531 * must be freed by the caller.
532 */
533static bool add_sfs_aces(files_struct *fsp, struct ifs_security_descriptor *sd)
534{
535 int error;
536 SMB_STRUCT_STAT sbuf;
537
538 error = SMB_VFS_FSTAT(fsp, &sbuf);
539 if (error) {
540 DEBUG(0, ("Failed to stat %s in simple files sharing "
541 "compatibility mode. errno=%d\n",
542 fsp_str_dbg(fsp), errno));
543 return false;
544 }
545
546 /* Only continue if this is a synthetic ACL and a directory. */
547 if (S_ISDIR(sbuf.st_ex_mode) &&
548 (sbuf.st_ex_flags & SF_HASNTFSACL) == 0) {
549 struct ifs_ace new_aces[6];
550 struct ifs_ace *old_aces;
551 int i, num_aces_to_add = 0;
552 mode_t file_mode = 0, dir_mode = 0;
553
554 /* Use existing samba logic to derive the mode bits. */
555 file_mode = unix_mode(fsp->conn, 0, fsp->fsp_name, NULL);
556 dir_mode = unix_mode(fsp->conn, aDIR, fsp->fsp_name, NULL);
557
558 /* Initialize ACEs. */
559 new_aces[0] = onefs_init_ace(fsp->conn, file_mode, false, USR);
560 new_aces[1] = onefs_init_ace(fsp->conn, file_mode, false, GRP);
561 new_aces[2] = onefs_init_ace(fsp->conn, file_mode, false, OTH);
562 new_aces[3] = onefs_init_ace(fsp->conn, dir_mode, true, USR);
563 new_aces[4] = onefs_init_ace(fsp->conn, dir_mode, true, GRP);
564 new_aces[5] = onefs_init_ace(fsp->conn, dir_mode, true, OTH);
565
566 for (i = 0; i < 6; i++)
567 if (new_aces[i].access_mask != 0)
568 num_aces_to_add++;
569
570 /* Expand the ACEs array */
571 if (num_aces_to_add != 0) {
572 old_aces = sd->dacl->aces;
573
574 sd->dacl->aces = SMB_MALLOC_ARRAY(struct ifs_ace,
575 sd->dacl->num_aces + num_aces_to_add);
576 if (!sd->dacl->aces) {
577 DEBUG(0, ("Unable to malloc space for "
578 "new_aces: %d.\n",
579 sd->dacl->num_aces + num_aces_to_add));
580 return false;
581 }
582 memcpy(sd->dacl->aces, old_aces,
583 sizeof(struct ifs_ace) * sd->dacl->num_aces);
584
585 /* Add the new ACEs to the DACL. */
586 for (i = 0; i < 6; i++) {
587 if (new_aces[i].access_mask != 0) {
588 sd->dacl->aces[sd->dacl->num_aces] =
589 new_aces[i];
590 sd->dacl->num_aces++;
591 }
592 }
593 }
594 }
595 return true;
596}
597