?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6/mini2440.git] / fs / cifs / cifsacl.c
blob0e9fc2ba90ee23998c33e1125b6186c8f8150ac5
1 /*
2 * fs/cifs/cifsacl.c
3 *
4 * Copyright (C) International Business Machines Corp., 2007,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * Contains the routines for mapping CIFS/NTFS ACLs
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include <linux/fs.h>
25 #include "cifspdu.h"
26 #include "cifsglob.h"
27 #include "cifsacl.h"
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
30
31
32 #ifdef CONFIG_CIFS_EXPERIMENTAL
33
34 static struct cifs_wksid wksidarr[NUM_WK_SIDS] = {
35 {{1, 0, {0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0} }, "null user"},
36 {{1, 1, {0, 0, 0, 0, 0, 1}, {0, 0, 0, 0, 0} }, "nobody"},
37 {{1, 1, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(11), 0, 0, 0, 0} }, "net-users"},
38 {{1, 1, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(18), 0, 0, 0, 0} }, "sys"},
39 {{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_cpu_to_le32(544), 0, 0, 0} }, "root"},
40 {{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_cpu_to_le32(545), 0, 0, 0} }, "users"},
41 {{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_cpu_to_le32(546), 0, 0, 0} }, "guest"} }
42 ;
43
44
45 /* security id for everyone */
46 static const struct cifs_sid sid_everyone = {
47 1, 1, {0, 0, 0, 0, 0, 1}, {0} };
48 /* group users */
49 static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} };
50
51
52 int match_sid(struct cifs_sid *ctsid)
53 {
54 int i, j;
55 int num_subauth, num_sat, num_saw;
56 struct cifs_sid *cwsid;
57
58 if (!ctsid)
59 return (-1);
60
61 for (i = 0; i < NUM_WK_SIDS; ++i) {
62 cwsid = &(wksidarr[i].cifssid);
63
64 /* compare the revision */
65 if (ctsid->revision != cwsid->revision)
66 continue;
67
68 /* compare all of the six auth values */
69 for (j = 0; j < 6; ++j) {
70 if (ctsid->authority[j] != cwsid->authority[j])
71 break;
72 }
73 if (j < 6)
74 continue; /* all of the auth values did not match */
75
76 /* compare all of the subauth values if any */
77 num_sat = ctsid->num_subauth;
78 num_saw = cwsid->num_subauth;
79 num_subauth = num_sat < num_saw ? num_sat : num_saw;
80 if (num_subauth) {
81 for (j = 0; j < num_subauth; ++j) {
82 if (ctsid->sub_auth[j] != cwsid->sub_auth[j])
83 break;
84 }
85 if (j < num_subauth)
86 continue; /* all sub_auth values do not match */
87 }
88
89 cFYI(1, ("matching sid: %s\n", wksidarr[i].sidname));
90 return (0); /* sids compare/match */
91 }
92
93 cFYI(1, ("No matching sid"));
94 return (-1);
95 }
96
97 /* if the two SIDs (roughly equivalent to a UUID for a user or group) are
98 the same returns 1, if they do not match returns 0 */
99 int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid)
100 {
101 int i;
102 int num_subauth, num_sat, num_saw;
103
104 if ((!ctsid) || (!cwsid))
105 return (0);
106
107 /* compare the revision */
108 if (ctsid->revision != cwsid->revision)
109 return (0);
110
111 /* compare all of the six auth values */
112 for (i = 0; i < 6; ++i) {
113 if (ctsid->authority[i] != cwsid->authority[i])
114 return (0);
115 }
116
117 /* compare all of the subauth values if any */
118 num_sat = ctsid->num_subauth;
119 num_saw = cwsid->num_subauth;
120 num_subauth = num_sat < num_saw ? num_sat : num_saw;
121 if (num_subauth) {
122 for (i = 0; i < num_subauth; ++i) {
123 if (ctsid->sub_auth[i] != cwsid->sub_auth[i])
124 return (0);
125 }
126 }
127
128 return (1); /* sids compare/match */
129 }
130
131
132 /* copy ntsd, owner sid, and group sid from a security descriptor to another */
133 static void copy_sec_desc(const struct cifs_ntsd *pntsd,
134 struct cifs_ntsd *pnntsd, __u32 sidsoffset)
135 {
136 int i;
137
138 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
139 struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr;
140
141 /* copy security descriptor control portion */
142 pnntsd->revision = pntsd->revision;
143 pnntsd->type = pntsd->type;
144 pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd));
145 pnntsd->sacloffset = 0;
146 pnntsd->osidoffset = cpu_to_le32(sidsoffset);
147 pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid));
148
149 /* copy owner sid */
150 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
151 le32_to_cpu(pntsd->osidoffset));
152 nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset);
153
154 nowner_sid_ptr->revision = owner_sid_ptr->revision;
155 nowner_sid_ptr->num_subauth = owner_sid_ptr->num_subauth;
156 for (i = 0; i < 6; i++)
157 nowner_sid_ptr->authority[i] = owner_sid_ptr->authority[i];
158 for (i = 0; i < 5; i++)
159 nowner_sid_ptr->sub_auth[i] = owner_sid_ptr->sub_auth[i];
160
161 /* copy group sid */
162 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
163 le32_to_cpu(pntsd->gsidoffset));
164 ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset +
165 sizeof(struct cifs_sid));
166
167 ngroup_sid_ptr->revision = group_sid_ptr->revision;
168 ngroup_sid_ptr->num_subauth = group_sid_ptr->num_subauth;
169 for (i = 0; i < 6; i++)
170 ngroup_sid_ptr->authority[i] = group_sid_ptr->authority[i];
171 for (i = 0; i < 5; i++)
172 ngroup_sid_ptr->sub_auth[i] =
173 cpu_to_le32(group_sid_ptr->sub_auth[i]);
174
175 return;
176 }
177
178
179 /*
180 change posix mode to reflect permissions
181 pmode is the existing mode (we only want to overwrite part of this
182 bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
183 */
184 static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode,
185 umode_t *pbits_to_set)
186 {
187 __u32 flags = le32_to_cpu(ace_flags);
188 /* the order of ACEs is important. The canonical order is to begin with
189 DENY entries followed by ALLOW, otherwise an allow entry could be
190 encountered first, making the subsequent deny entry like "dead code"
191 which would be superflous since Windows stops when a match is made
192 for the operation you are trying to perform for your user */
193
194 /* For deny ACEs we change the mask so that subsequent allow access
195 control entries do not turn on the bits we are denying */
196 if (type == ACCESS_DENIED) {
197 if (flags & GENERIC_ALL)
198 *pbits_to_set &= ~S_IRWXUGO;
199
200 if ((flags & GENERIC_WRITE) ||
201 ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
202 *pbits_to_set &= ~S_IWUGO;
203 if ((flags & GENERIC_READ) ||
204 ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
205 *pbits_to_set &= ~S_IRUGO;
206 if ((flags & GENERIC_EXECUTE) ||
207 ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
208 *pbits_to_set &= ~S_IXUGO;
209 return;
210 } else if (type != ACCESS_ALLOWED) {
211 cERROR(1, ("unknown access control type %d", type));
212 return;
213 }
214 /* else ACCESS_ALLOWED type */
215
216 if (flags & GENERIC_ALL) {
217 *pmode |= (S_IRWXUGO & (*pbits_to_set));
218 cFYI(DBG2, ("all perms"));
219 return;
220 }
221 if ((flags & GENERIC_WRITE) ||
222 ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
223 *pmode |= (S_IWUGO & (*pbits_to_set));
224 if ((flags & GENERIC_READ) ||
225 ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
226 *pmode |= (S_IRUGO & (*pbits_to_set));
227 if ((flags & GENERIC_EXECUTE) ||
228 ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
229 *pmode |= (S_IXUGO & (*pbits_to_set));
230
231 cFYI(DBG2, ("access flags 0x%x mode now 0x%x", flags, *pmode));
232 return;
233 }
234
235 /*
236 Generate access flags to reflect permissions mode is the existing mode.
237 This function is called for every ACE in the DACL whose SID matches
238 with either owner or group or everyone.
239 */
240
241 static void mode_to_access_flags(umode_t mode, umode_t bits_to_use,
242 __u32 *pace_flags)
243 {
244 /* reset access mask */
245 *pace_flags = 0x0;
246
247 /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */
248 mode &= bits_to_use;
249
250 /* check for R/W/X UGO since we do not know whose flags
251 is this but we have cleared all the bits sans RWX for
252 either user or group or other as per bits_to_use */
253 if (mode & S_IRUGO)
254 *pace_flags |= SET_FILE_READ_RIGHTS;
255 if (mode & S_IWUGO)
256 *pace_flags |= SET_FILE_WRITE_RIGHTS;
257 if (mode & S_IXUGO)
258 *pace_flags |= SET_FILE_EXEC_RIGHTS;
259
260 cFYI(DBG2, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags));
261 return;
262 }
263
264 static __u16 fill_ace_for_sid(struct cifs_ace *pntace,
265 const struct cifs_sid *psid, __u64 nmode, umode_t bits)
266 {
267 int i;
268 __u16 size = 0;
269 __u32 access_req = 0;
270
271 pntace->type = ACCESS_ALLOWED;
272 pntace->flags = 0x0;
273 mode_to_access_flags(nmode, bits, &access_req);
274 if (!access_req)
275 access_req = SET_MINIMUM_RIGHTS;
276 pntace->access_req = cpu_to_le32(access_req);
277
278 pntace->sid.revision = psid->revision;
279 pntace->sid.num_subauth = psid->num_subauth;
280 for (i = 0; i < 6; i++)
281 pntace->sid.authority[i] = psid->authority[i];
282 for (i = 0; i < psid->num_subauth; i++)
283 pntace->sid.sub_auth[i] = psid->sub_auth[i];
284
285 size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4);
286 pntace->size = cpu_to_le16(size);
287
288 return (size);
289 }
290
291
292 #ifdef CONFIG_CIFS_DEBUG2
293 static void dump_ace(struct cifs_ace *pace, char *end_of_acl)
294 {
295 int num_subauth;
296
297 /* validate that we do not go past end of acl */
298
299 if (le16_to_cpu(pace->size) < 16) {
300 cERROR(1, ("ACE too small, %d", le16_to_cpu(pace->size)));
301 return;
302 }
303
304 if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) {
305 cERROR(1, ("ACL too small to parse ACE"));
306 return;
307 }
308
309 num_subauth = pace->sid.num_subauth;
310 if (num_subauth) {
311 int i;
312 cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d",
313 pace->sid.revision, pace->sid.num_subauth, pace->type,
314 pace->flags, le16_to_cpu(pace->size)));
315 for (i = 0; i < num_subauth; ++i) {
316 cFYI(1, ("ACE sub_auth[%d]: 0x%x", i,
317 le32_to_cpu(pace->sid.sub_auth[i])));
318 }
319
320 /* BB add length check to make sure that we do not have huge
321 num auths and therefore go off the end */
322 }
323
324 return;
325 }
326 #endif
327
328
329 static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
330 struct cifs_sid *pownersid, struct cifs_sid *pgrpsid,
331 struct inode *inode)
332 {
333 int i;
334 int num_aces = 0;
335 int acl_size;
336 char *acl_base;
337 struct cifs_ace **ppace;
338
339 /* BB need to add parm so we can store the SID BB */
340
341 if (!pdacl) {
342 /* no DACL in the security descriptor, set
343 all the permissions for user/group/other */
344 inode->i_mode |= S_IRWXUGO;
345 return;
346 }
347
348 /* validate that we do not go past end of acl */
349 if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
350 cERROR(1, ("ACL too small to parse DACL"));
351 return;
352 }
353
354 cFYI(DBG2, ("DACL revision %d size %d num aces %d",
355 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
356 le32_to_cpu(pdacl->num_aces)));
357
358 /* reset rwx permissions for user/group/other.
359 Also, if num_aces is 0 i.e. DACL has no ACEs,
360 user/group/other have no permissions */
361 inode->i_mode &= ~(S_IRWXUGO);
362
363 acl_base = (char *)pdacl;
364 acl_size = sizeof(struct cifs_acl);
365
366 num_aces = le32_to_cpu(pdacl->num_aces);
367 if (num_aces > 0) {
368 umode_t user_mask = S_IRWXU;
369 umode_t group_mask = S_IRWXG;
370 umode_t other_mask = S_IRWXO;
371
372 ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
373 GFP_KERNEL);
374
375 for (i = 0; i < num_aces; ++i) {
376 ppace[i] = (struct cifs_ace *) (acl_base + acl_size);
377 #ifdef CONFIG_CIFS_DEBUG2
378 dump_ace(ppace[i], end_of_acl);
379 #endif
380 if (compare_sids(&(ppace[i]->sid), pownersid))
381 access_flags_to_mode(ppace[i]->access_req,
382 ppace[i]->type,
383 &(inode->i_mode),
384 &user_mask);
385 if (compare_sids(&(ppace[i]->sid), pgrpsid))
386 access_flags_to_mode(ppace[i]->access_req,
387 ppace[i]->type,
388 &(inode->i_mode),
389 &group_mask);
390 if (compare_sids(&(ppace[i]->sid), &sid_everyone))
391 access_flags_to_mode(ppace[i]->access_req,
392 ppace[i]->type,
393 &(inode->i_mode),
394 &other_mask);
395
396 /* memcpy((void *)(&(cifscred->aces[i])),
397 (void *)ppace[i],
398 sizeof(struct cifs_ace)); */
399
400 acl_base = (char *)ppace[i];
401 acl_size = le16_to_cpu(ppace[i]->size);
402 }
403
404 kfree(ppace);
405 }
406
407 return;
408 }
409
410
411 static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
412 struct cifs_sid *pgrpsid, __u64 nmode)
413 {
414 u16 size = 0;
415 struct cifs_acl *pnndacl;
416
417 pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl));
418
419 size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size),
420 pownersid, nmode, S_IRWXU);
421 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
422 pgrpsid, nmode, S_IRWXG);
423 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
424 &sid_everyone, nmode, S_IRWXO);
425
426 pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl));
427 pndacl->num_aces = cpu_to_le32(3);
428
429 return (0);
430 }
431
432
433 static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
434 {
435 /* BB need to add parm so we can store the SID BB */
436
437 /* validate that we do not go past end of ACL - sid must be at least 8
438 bytes long (assuming no sub-auths - e.g. the null SID */
439 if (end_of_acl < (char *)psid + 8) {
440 cERROR(1, ("ACL too small to parse SID %p", psid));
441 return -EINVAL;
442 }
443
444 if (psid->num_subauth) {
445 #ifdef CONFIG_CIFS_DEBUG2
446 int i;
447 cFYI(1, ("SID revision %d num_auth %d",
448 psid->revision, psid->num_subauth));
449
450 for (i = 0; i < psid->num_subauth; i++) {
451 cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
452 le32_to_cpu(psid->sub_auth[i])));
453 }
454
455 /* BB add length check to make sure that we do not have huge
456 num auths and therefore go off the end */
457 cFYI(1, ("RID 0x%x",
458 le32_to_cpu(psid->sub_auth[psid->num_subauth-1])));
459 #endif
460 }
461
462 return 0;
463 }
464
465
466 /* Convert CIFS ACL to POSIX form */
467 static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len,
468 struct inode *inode)
469 {
470 int rc;
471 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
472 struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
473 char *end_of_acl = ((char *)pntsd) + acl_len;
474 __u32 dacloffset;
475
476 if ((inode == NULL) || (pntsd == NULL))
477 return -EIO;
478
479 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
480 le32_to_cpu(pntsd->osidoffset));
481 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
482 le32_to_cpu(pntsd->gsidoffset));
483 dacloffset = le32_to_cpu(pntsd->dacloffset);
484 dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset);
485 cFYI(DBG2, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
486 "sacloffset 0x%x dacloffset 0x%x",
487 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
488 le32_to_cpu(pntsd->gsidoffset),
489 le32_to_cpu(pntsd->sacloffset), dacloffset));
490 /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */
491 rc = parse_sid(owner_sid_ptr, end_of_acl);
492 if (rc)
493 return rc;
494
495 rc = parse_sid(group_sid_ptr, end_of_acl);
496 if (rc)
497 return rc;
498
499 if (dacloffset)
500 parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr,
501 group_sid_ptr, inode);
502 else
503 cFYI(1, ("no ACL")); /* BB grant all or default perms? */
504
505 /* cifscred->uid = owner_sid_ptr->rid;
506 cifscred->gid = group_sid_ptr->rid;
507 memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr,
508 sizeof(struct cifs_sid));
509 memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
510 sizeof(struct cifs_sid)); */
511
512
513 return (0);
514 }
515
516
517 /* Convert permission bits from mode to equivalent CIFS ACL */
518 static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
519 struct inode *inode, __u64 nmode)
520 {
521 int rc = 0;
522 __u32 dacloffset;
523 __u32 ndacloffset;
524 __u32 sidsoffset;
525 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
526 struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */
527 struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */
528
529 if ((inode == NULL) || (pntsd == NULL) || (pnntsd == NULL))
530 return (-EIO);
531
532 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
533 le32_to_cpu(pntsd->osidoffset));
534 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
535 le32_to_cpu(pntsd->gsidoffset));
536
537 dacloffset = le32_to_cpu(pntsd->dacloffset);
538 dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset);
539
540 ndacloffset = sizeof(struct cifs_ntsd);
541 ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset);
542 ndacl_ptr->revision = dacl_ptr->revision;
543 ndacl_ptr->size = 0;
544 ndacl_ptr->num_aces = 0;
545
546 rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, nmode);
547
548 sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size);
549
550 /* copy security descriptor control portion and owner and group sid */
551 copy_sec_desc(pntsd, pnntsd, sidsoffset);
552
553 return (rc);
554 }
555
556
557 /* Retrieve an ACL from the server */
558 static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
559 const char *path, const __u16 *pfid)
560 {
561 struct cifsFileInfo *open_file = NULL;
562 bool unlock_file = false;
563 int xid;
564 int rc = -EIO;
565 __u16 fid;
566 struct super_block *sb;
567 struct cifs_sb_info *cifs_sb;
568 struct cifs_ntsd *pntsd = NULL;
569
570 cFYI(1, ("get mode from ACL for %s", path));
571
572 if (inode == NULL)
573 return NULL;
574
575 xid = GetXid();
576 if (pfid == NULL)
577 open_file = find_readable_file(CIFS_I(inode));
578 else
579 fid = *pfid;
580
581 sb = inode->i_sb;
582 if (sb == NULL) {
583 FreeXid(xid);
584 return NULL;
585 }
586 cifs_sb = CIFS_SB(sb);
587
588 if (open_file) {
589 unlock_file = true;
590 fid = open_file->netfid;
591 } else if (pfid == NULL) {
592 int oplock = 0;
593 /* open file */
594 rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
595 READ_CONTROL, 0, &fid, &oplock, NULL,
596 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
597 CIFS_MOUNT_MAP_SPECIAL_CHR);
598 if (rc != 0) {
599 cERROR(1, ("Unable to open file to get ACL"));
600 FreeXid(xid);
601 return NULL;
602 }
603 }
604
605 rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
606 cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
607 if (unlock_file == true) /* find_readable_file increments ref count */
608 atomic_dec(&open_file->wrtPending);
609 else if (pfid == NULL) /* if opened above we have to close the handle */
610 CIFSSMBClose(xid, cifs_sb->tcon, fid);
611 /* else handle was passed in by caller */
612
613 FreeXid(xid);
614 return pntsd;
615 }
616
617 /* Set an ACL on the server */
618 static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
619 struct inode *inode, const char *path)
620 {
621 struct cifsFileInfo *open_file;
622 bool unlock_file = false;
623 int xid;
624 int rc = -EIO;
625 __u16 fid;
626 struct super_block *sb;
627 struct cifs_sb_info *cifs_sb;
628
629 cFYI(DBG2, ("set ACL for %s from mode 0x%x", path, inode->i_mode));
630
631 if (!inode)
632 return (rc);
633
634 sb = inode->i_sb;
635 if (sb == NULL)
636 return (rc);
637
638 cifs_sb = CIFS_SB(sb);
639 xid = GetXid();
640
641 open_file = find_readable_file(CIFS_I(inode));
642 if (open_file) {
643 unlock_file = true;
644 fid = open_file->netfid;
645 } else {
646 int oplock = 0;
647 /* open file */
648 rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
649 WRITE_DAC, 0, &fid, &oplock, NULL,
650 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
651 CIFS_MOUNT_MAP_SPECIAL_CHR);
652 if (rc != 0) {
653 cERROR(1, ("Unable to open file to set ACL"));
654 FreeXid(xid);
655 return (rc);
656 }
657 }
658
659 rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
660 cFYI(DBG2, ("SetCIFSACL rc = %d", rc));
661 if (unlock_file)
662 atomic_dec(&open_file->wrtPending);
663 else
664 CIFSSMBClose(xid, cifs_sb->tcon, fid);
665
666 FreeXid(xid);
667
668 return (rc);
669 }
670
671 /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
672 void acl_to_uid_mode(struct inode *inode, const char *path, const __u16 *pfid)
673 {
674 struct cifs_ntsd *pntsd = NULL;
675 u32 acllen = 0;
676 int rc = 0;
677
678 cFYI(DBG2, ("converting ACL to mode for %s", path));
679 pntsd = get_cifs_acl(&acllen, inode, path, pfid);
680
681 /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */
682 if (pntsd)
683 rc = parse_sec_desc(pntsd, acllen, inode);
684 if (rc)
685 cFYI(1, ("parse sec desc failed rc = %d", rc));
686
687 kfree(pntsd);
688 return;
689 }
690
691 /* Convert mode bits to an ACL so we can update the ACL on the server */
692 int mode_to_acl(struct inode *inode, const char *path, __u64 nmode)
693 {
694 int rc = 0;
695 __u32 secdesclen = 0;
696 struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */
697 struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */
698
699 cFYI(DBG2, ("set ACL from mode for %s", path));
700
701 /* Get the security descriptor */
702 pntsd = get_cifs_acl(&secdesclen, inode, path, NULL);
703
704 /* Add three ACEs for owner, group, everyone getting rid of
705 other ACEs as chmod disables ACEs and set the security descriptor */
706
707 if (pntsd) {
708 /* allocate memory for the smb header,
709 set security descriptor request security descriptor
710 parameters, and secuirty descriptor itself */
711
712 secdesclen = secdesclen < DEFSECDESCLEN ?
713 DEFSECDESCLEN : secdesclen;
714 pnntsd = kmalloc(secdesclen, GFP_KERNEL);
715 if (!pnntsd) {
716 cERROR(1, ("Unable to allocate security descriptor"));
717 kfree(pntsd);
718 return (-ENOMEM);
719 }
720
721 rc = build_sec_desc(pntsd, pnntsd, inode, nmode);
722
723 cFYI(DBG2, ("build_sec_desc rc: %d", rc));
724
725 if (!rc) {
726 /* Set the security descriptor */
727 rc = set_cifs_acl(pnntsd, secdesclen, inode, path);
728 cFYI(DBG2, ("set_cifs_acl rc: %d", rc));
729 }
730
731 kfree(pnntsd);
732 kfree(pntsd);
733 }
734
735 return (rc);
736 }
737 #endif /* CONFIG_CIFS_EXPERIMENTAL */
Support for the Chinese Samsung S3C2440 based development boards