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1/*
2 * fs/cifs/xattr.c
3 *
4 * Copyright (c) International Business Machines Corp., 2003, 2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/fs.h>
23#include <linux/posix_acl_xattr.h>
24#include <linux/slab.h>
25#include "cifsfs.h"
26#include "cifspdu.h"
27#include "cifsglob.h"
28#include "cifsproto.h"
29#include "cifs_debug.h"
30
31#define MAX_EA_VALUE_SIZE 65535
32#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
33#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
34#define CIFS_XATTR_USER_PREFIX "user."
35#define CIFS_XATTR_SYSTEM_PREFIX "system."
36#define CIFS_XATTR_OS2_PREFIX "os2."
37#define CIFS_XATTR_SECURITY_PREFIX "security."
38#define CIFS_XATTR_TRUSTED_PREFIX "trusted."
39#define XATTR_TRUSTED_PREFIX_LEN 8
40#define XATTR_SECURITY_PREFIX_LEN 9
41/* BB need to add server (Samba e.g) support for security and trusted prefix */
42
43
44
45int cifs_removexattr(struct dentry *direntry, const char *ea_name)
46{
47 int rc = -EOPNOTSUPP;
48#ifdef CONFIG_CIFS_XATTR
49 int xid;
50 struct cifs_sb_info *cifs_sb;
51 struct tcon_link *tlink;
52 struct cifs_tcon *pTcon;
53 struct super_block *sb;
54 char *full_path = NULL;
55
56 if (direntry == NULL)
57 return -EIO;
58 if (direntry->d_inode == NULL)
59 return -EIO;
60 sb = direntry->d_inode->i_sb;
61 if (sb == NULL)
62 return -EIO;
63
64 cifs_sb = CIFS_SB(sb);
65 tlink = cifs_sb_tlink(cifs_sb);
66 if (IS_ERR(tlink))
67 return PTR_ERR(tlink);
68 pTcon = tlink_tcon(tlink);
69
70 xid = GetXid();
71
72 full_path = build_path_from_dentry(direntry);
73 if (full_path == NULL) {
74 rc = -ENOMEM;
75 goto remove_ea_exit;
76 }
77 if (ea_name == NULL) {
78 cFYI(1, "Null xattr names not supported");
79 } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5)
80 && (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4))) {
81 cFYI(1,
82 "illegal xattr request %s (only user namespace supported)",
83 ea_name);
84 /* BB what if no namespace prefix? */
85 /* Should we just pass them to server, except for
86 system and perhaps security prefixes? */
87 } else {
88 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
89 goto remove_ea_exit;
90
91 ea_name += 5; /* skip past user. prefix */
92 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, NULL,
93 (__u16)0, cifs_sb->local_nls,
94 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
95 }
96remove_ea_exit:
97 kfree(full_path);
98 FreeXid(xid);
99 cifs_put_tlink(tlink);
100#endif
101 return rc;
102}
103
104int cifs_setxattr(struct dentry *direntry, const char *ea_name,
105 const void *ea_value, size_t value_size, int flags)
106{
107 int rc = -EOPNOTSUPP;
108#ifdef CONFIG_CIFS_XATTR
109 int xid;
110 struct cifs_sb_info *cifs_sb;
111 struct tcon_link *tlink;
112 struct cifs_tcon *pTcon;
113 struct super_block *sb;
114 char *full_path;
115 struct cifs_ntsd *pacl;
116
117 if (direntry == NULL)
118 return -EIO;
119 if (direntry->d_inode == NULL)
120 return -EIO;
121 sb = direntry->d_inode->i_sb;
122 if (sb == NULL)
123 return -EIO;
124
125 cifs_sb = CIFS_SB(sb);
126 tlink = cifs_sb_tlink(cifs_sb);
127 if (IS_ERR(tlink))
128 return PTR_ERR(tlink);
129 pTcon = tlink_tcon(tlink);
130
131 xid = GetXid();
132
133 full_path = build_path_from_dentry(direntry);
134 if (full_path == NULL) {
135 rc = -ENOMEM;
136 goto set_ea_exit;
137 }
138 /* return dos attributes as pseudo xattr */
139 /* return alt name if available as pseudo attr */
140
141 /* if proc/fs/cifs/streamstoxattr is set then
142 search server for EAs or streams to
143 returns as xattrs */
144 if (value_size > MAX_EA_VALUE_SIZE) {
145 cFYI(1, "size of EA value too large");
146 rc = -EOPNOTSUPP;
147 goto set_ea_exit;
148 }
149
150 if (ea_name == NULL) {
151 cFYI(1, "Null xattr names not supported");
152 } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) {
153 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
154 goto set_ea_exit;
155 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
156 cFYI(1, "attempt to set cifs inode metadata");
157
158 ea_name += 5; /* skip past user. prefix */
159 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
160 (__u16)value_size, cifs_sb->local_nls,
161 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
162 } else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) {
163 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
164 goto set_ea_exit;
165
166 ea_name += 4; /* skip past os2. prefix */
167 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
168 (__u16)value_size, cifs_sb->local_nls,
169 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
170 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
171 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
172 pacl = kmalloc(value_size, GFP_KERNEL);
173 if (!pacl) {
174 cFYI(1, "%s: Can't allocate memory for ACL",
175 __func__);
176 rc = -ENOMEM;
177 } else {
178#ifdef CONFIG_CIFS_ACL
179 memcpy(pacl, ea_value, value_size);
180 rc = set_cifs_acl(pacl, value_size,
181 direntry->d_inode, full_path);
182 if (rc == 0) /* force revalidate of the inode */
183 CIFS_I(direntry->d_inode)->time = 0;
184 kfree(pacl);
185#else
186 cFYI(1, "Set CIFS ACL not supported yet");
187#endif /* CONFIG_CIFS_ACL */
188 }
189 } else {
190 int temp;
191 temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
192 strlen(POSIX_ACL_XATTR_ACCESS));
193 if (temp == 0) {
194#ifdef CONFIG_CIFS_POSIX
195 if (sb->s_flags & MS_POSIXACL)
196 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
197 ea_value, (const int)value_size,
198 ACL_TYPE_ACCESS, cifs_sb->local_nls,
199 cifs_sb->mnt_cifs_flags &
200 CIFS_MOUNT_MAP_SPECIAL_CHR);
201 cFYI(1, "set POSIX ACL rc %d", rc);
202#else
203 cFYI(1, "set POSIX ACL not supported");
204#endif
205 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
206 strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
207#ifdef CONFIG_CIFS_POSIX
208 if (sb->s_flags & MS_POSIXACL)
209 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
210 ea_value, (const int)value_size,
211 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
212 cifs_sb->mnt_cifs_flags &
213 CIFS_MOUNT_MAP_SPECIAL_CHR);
214 cFYI(1, "set POSIX default ACL rc %d", rc);
215#else
216 cFYI(1, "set default POSIX ACL not supported");
217#endif
218 } else {
219 cFYI(1, "illegal xattr request %s (only user namespace"
220 " supported)", ea_name);
221 /* BB what if no namespace prefix? */
222 /* Should we just pass them to server, except for
223 system and perhaps security prefixes? */
224 }
225 }
226
227set_ea_exit:
228 kfree(full_path);
229 FreeXid(xid);
230 cifs_put_tlink(tlink);
231#endif
232 return rc;
233}
234
235ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
236 void *ea_value, size_t buf_size)
237{
238 ssize_t rc = -EOPNOTSUPP;
239#ifdef CONFIG_CIFS_XATTR
240 int xid;
241 struct cifs_sb_info *cifs_sb;
242 struct tcon_link *tlink;
243 struct cifs_tcon *pTcon;
244 struct super_block *sb;
245 char *full_path;
246
247 if (direntry == NULL)
248 return -EIO;
249 if (direntry->d_inode == NULL)
250 return -EIO;
251 sb = direntry->d_inode->i_sb;
252 if (sb == NULL)
253 return -EIO;
254
255 cifs_sb = CIFS_SB(sb);
256 tlink = cifs_sb_tlink(cifs_sb);
257 if (IS_ERR(tlink))
258 return PTR_ERR(tlink);
259 pTcon = tlink_tcon(tlink);
260
261 xid = GetXid();
262
263 full_path = build_path_from_dentry(direntry);
264 if (full_path == NULL) {
265 rc = -ENOMEM;
266 goto get_ea_exit;
267 }
268 /* return dos attributes as pseudo xattr */
269 /* return alt name if available as pseudo attr */
270 if (ea_name == NULL) {
271 cFYI(1, "Null xattr names not supported");
272 } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) {
273 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
274 goto get_ea_exit;
275
276 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
277 cFYI(1, "attempt to query cifs inode metadata");
278 /* revalidate/getattr then populate from inode */
279 } /* BB add else when above is implemented */
280 ea_name += 5; /* skip past user. prefix */
281 rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
282 buf_size, cifs_sb->local_nls,
283 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
284 } else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) {
285 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
286 goto get_ea_exit;
287
288 ea_name += 4; /* skip past os2. prefix */
289 rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
290 buf_size, cifs_sb->local_nls,
291 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
292 } else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
293 strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
294#ifdef CONFIG_CIFS_POSIX
295 if (sb->s_flags & MS_POSIXACL)
296 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
297 ea_value, buf_size, ACL_TYPE_ACCESS,
298 cifs_sb->local_nls,
299 cifs_sb->mnt_cifs_flags &
300 CIFS_MOUNT_MAP_SPECIAL_CHR);
301#else
302 cFYI(1, "Query POSIX ACL not supported yet");
303#endif /* CONFIG_CIFS_POSIX */
304 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
305 strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
306#ifdef CONFIG_CIFS_POSIX
307 if (sb->s_flags & MS_POSIXACL)
308 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
309 ea_value, buf_size, ACL_TYPE_DEFAULT,
310 cifs_sb->local_nls,
311 cifs_sb->mnt_cifs_flags &
312 CIFS_MOUNT_MAP_SPECIAL_CHR);
313#else
314 cFYI(1, "Query POSIX default ACL not supported yet");
315#endif /* CONFIG_CIFS_POSIX */
316 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
317 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
318#ifdef CONFIG_CIFS_ACL
319 u32 acllen;
320 struct cifs_ntsd *pacl;
321
322 pacl = get_cifs_acl(cifs_sb, direntry->d_inode,
323 full_path, &acllen);
324 if (IS_ERR(pacl)) {
325 rc = PTR_ERR(pacl);
326 cERROR(1, "%s: error %zd getting sec desc",
327 __func__, rc);
328 } else {
329 if (ea_value) {
330 if (acllen > buf_size)
331 acllen = -ERANGE;
332 else
333 memcpy(ea_value, pacl, acllen);
334 }
335 rc = acllen;
336 kfree(pacl);
337 }
338#else
339 cFYI(1, "Query CIFS ACL not supported yet");
340#endif /* CONFIG_CIFS_ACL */
341 } else if (strncmp(ea_name,
342 CIFS_XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
343 cFYI(1, "Trusted xattr namespace not supported yet");
344 } else if (strncmp(ea_name,
345 CIFS_XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
346 cFYI(1, "Security xattr namespace not supported yet");
347 } else
348 cFYI(1,
349 "illegal xattr request %s (only user namespace supported)",
350 ea_name);
351
352 /* We could add an additional check for streams ie
353 if proc/fs/cifs/streamstoxattr is set then
354 search server for EAs or streams to
355 returns as xattrs */
356
357 if (rc == -EINVAL)
358 rc = -EOPNOTSUPP;
359
360get_ea_exit:
361 kfree(full_path);
362 FreeXid(xid);
363 cifs_put_tlink(tlink);
364#endif
365 return rc;
366}
367
368ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
369{
370 ssize_t rc = -EOPNOTSUPP;
371#ifdef CONFIG_CIFS_XATTR
372 int xid;
373 struct cifs_sb_info *cifs_sb;
374 struct tcon_link *tlink;
375 struct cifs_tcon *pTcon;
376 struct super_block *sb;
377 char *full_path;
378
379 if (direntry == NULL)
380 return -EIO;
381 if (direntry->d_inode == NULL)
382 return -EIO;
383 sb = direntry->d_inode->i_sb;
384 if (sb == NULL)
385 return -EIO;
386
387 cifs_sb = CIFS_SB(sb);
388 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
389 return -EOPNOTSUPP;
390
391 tlink = cifs_sb_tlink(cifs_sb);
392 if (IS_ERR(tlink))
393 return PTR_ERR(tlink);
394 pTcon = tlink_tcon(tlink);
395
396 xid = GetXid();
397
398 full_path = build_path_from_dentry(direntry);
399 if (full_path == NULL) {
400 rc = -ENOMEM;
401 goto list_ea_exit;
402 }
403 /* return dos attributes as pseudo xattr */
404 /* return alt name if available as pseudo attr */
405
406 /* if proc/fs/cifs/streamstoxattr is set then
407 search server for EAs or streams to
408 returns as xattrs */
409 rc = CIFSSMBQAllEAs(xid, pTcon, full_path, NULL, data,
410 buf_size, cifs_sb->local_nls,
411 cifs_sb->mnt_cifs_flags &
412 CIFS_MOUNT_MAP_SPECIAL_CHR);
413
414list_ea_exit:
415 kfree(full_path);
416 FreeXid(xid);
417 cifs_put_tlink(tlink);
418#endif
419 return rc;
420}