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 "cifsfs.h"
25 #include "cifspdu.h"
26 #include "cifsglob.h"
27 #include "cifsproto.h"
28 #include "cifs_debug.h"
29
30 #define MAX_EA_VALUE_SIZE 65535
31 #define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
32 #define CIFS_XATTR_USER_PREFIX "user."
33 #define CIFS_XATTR_SYSTEM_PREFIX "system."
34 #define CIFS_XATTR_OS2_PREFIX "os2."
35 #define CIFS_XATTR_SECURITY_PREFIX ".security"
36 #define CIFS_XATTR_TRUSTED_PREFIX "trusted."
37 #define XATTR_TRUSTED_PREFIX_LEN 8
38 #define XATTR_SECURITY_PREFIX_LEN 9
39 /* BB need to add server (Samba e.g) support for security and trusted prefix */
40
41
42
cifs_removexattr(struct dentry * direntry,const char * ea_name)43 int cifs_removexattr(struct dentry *direntry, const char *ea_name)
44 {
45 int rc = -EOPNOTSUPP;
46 #ifdef CONFIG_CIFS_XATTR
47 int xid;
48 struct cifs_sb_info *cifs_sb;
49 struct cifsTconInfo *pTcon;
50 struct super_block *sb;
51 char *full_path;
52
53 if (direntry == NULL)
54 return -EIO;
55 if (direntry->d_inode == NULL)
56 return -EIO;
57 sb = direntry->d_inode->i_sb;
58 if (sb == NULL)
59 return -EIO;
60 xid = GetXid();
61
62 cifs_sb = CIFS_SB(sb);
63 pTcon = cifs_sb->tcon;
64
65 full_path = build_path_from_dentry(direntry);
66 if (full_path == NULL) {
67 FreeXid(xid);
68 return -ENOMEM;
69 }
70 if (ea_name == NULL) {
71 cFYI(1, ("Null xattr names not supported"));
72 } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5)
73 && (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4))) {
74 cFYI(1,
75 ("illegal xattr request %s (only user namespace supported)",
76 ea_name));
77 /* BB what if no namespace prefix? */
78 /* Should we just pass them to server, except for
79 system and perhaps security prefixes? */
80 } else {
81 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
82 goto remove_ea_exit;
83
84 ea_name += 5; /* skip past user. prefix */
85 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, NULL,
86 (__u16)0, cifs_sb->local_nls,
87 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
88 }
89 remove_ea_exit:
90 kfree(full_path);
91 FreeXid(xid);
92 #endif
93 return rc;
94 }
95
cifs_setxattr(struct dentry * direntry,const char * ea_name,const void * ea_value,size_t value_size,int flags)96 int cifs_setxattr(struct dentry *direntry, const char *ea_name,
97 const void *ea_value, size_t value_size, int flags)
98 {
99 int rc = -EOPNOTSUPP;
100 #ifdef CONFIG_CIFS_XATTR
101 int xid;
102 struct cifs_sb_info *cifs_sb;
103 struct cifsTconInfo *pTcon;
104 struct super_block *sb;
105 char *full_path;
106
107 if (direntry == NULL)
108 return -EIO;
109 if (direntry->d_inode == NULL)
110 return -EIO;
111 sb = direntry->d_inode->i_sb;
112 if (sb == NULL)
113 return -EIO;
114 xid = GetXid();
115
116 cifs_sb = CIFS_SB(sb);
117 pTcon = cifs_sb->tcon;
118
119 full_path = build_path_from_dentry(direntry);
120 if (full_path == NULL) {
121 FreeXid(xid);
122 return -ENOMEM;
123 }
124 /* return dos attributes as pseudo xattr */
125 /* return alt name if available as pseudo attr */
126
127 /* if proc/fs/cifs/streamstoxattr is set then
128 search server for EAs or streams to
129 returns as xattrs */
130 if (value_size > MAX_EA_VALUE_SIZE) {
131 cFYI(1, ("size of EA value too large"));
132 kfree(full_path);
133 FreeXid(xid);
134 return -EOPNOTSUPP;
135 }
136
137 if (ea_name == NULL) {
138 cFYI(1, ("Null xattr names not supported"));
139 } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) {
140 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
141 goto set_ea_exit;
142 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
143 cFYI(1, ("attempt to set cifs inode metadata"));
144
145 ea_name += 5; /* skip past user. prefix */
146 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
147 (__u16)value_size, cifs_sb->local_nls,
148 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
149 } else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) {
150 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
151 goto set_ea_exit;
152
153 ea_name += 4; /* skip past os2. prefix */
154 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
155 (__u16)value_size, cifs_sb->local_nls,
156 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
157 } else {
158 int temp;
159 temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
160 strlen(POSIX_ACL_XATTR_ACCESS));
161 if (temp == 0) {
162 #ifdef CONFIG_CIFS_POSIX
163 if (sb->s_flags & MS_POSIXACL)
164 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
165 ea_value, (const int)value_size,
166 ACL_TYPE_ACCESS, cifs_sb->local_nls,
167 cifs_sb->mnt_cifs_flags &
168 CIFS_MOUNT_MAP_SPECIAL_CHR);
169 cFYI(1, ("set POSIX ACL rc %d", rc));
170 #else
171 cFYI(1, ("set POSIX ACL not supported"));
172 #endif
173 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
174 strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
175 #ifdef CONFIG_CIFS_POSIX
176 if (sb->s_flags & MS_POSIXACL)
177 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
178 ea_value, (const int)value_size,
179 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
180 cifs_sb->mnt_cifs_flags &
181 CIFS_MOUNT_MAP_SPECIAL_CHR);
182 cFYI(1, ("set POSIX default ACL rc %d", rc));
183 #else
184 cFYI(1, ("set default POSIX ACL not supported"));
185 #endif
186 } else {
187 cFYI(1, ("illegal xattr request %s (only user namespace"
188 " supported)", ea_name));
189 /* BB what if no namespace prefix? */
190 /* Should we just pass them to server, except for
191 system and perhaps security prefixes? */
192 }
193 }
194
195 set_ea_exit:
196 kfree(full_path);
197 FreeXid(xid);
198 #endif
199 return rc;
200 }
201
cifs_getxattr(struct dentry * direntry,const char * ea_name,void * ea_value,size_t buf_size)202 ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
203 void *ea_value, size_t buf_size)
204 {
205 ssize_t rc = -EOPNOTSUPP;
206 #ifdef CONFIG_CIFS_XATTR
207 int xid;
208 struct cifs_sb_info *cifs_sb;
209 struct cifsTconInfo *pTcon;
210 struct super_block *sb;
211 char *full_path;
212
213 if (direntry == NULL)
214 return -EIO;
215 if (direntry->d_inode == NULL)
216 return -EIO;
217 sb = direntry->d_inode->i_sb;
218 if (sb == NULL)
219 return -EIO;
220
221 xid = GetXid();
222
223 cifs_sb = CIFS_SB(sb);
224 pTcon = cifs_sb->tcon;
225
226 full_path = build_path_from_dentry(direntry);
227 if (full_path == NULL) {
228 FreeXid(xid);
229 return -ENOMEM;
230 }
231 /* return dos attributes as pseudo xattr */
232 /* return alt name if available as pseudo attr */
233 if (ea_name == NULL) {
234 cFYI(1, ("Null xattr names not supported"));
235 } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) {
236 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
237 goto get_ea_exit;
238
239 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
240 cFYI(1, ("attempt to query cifs inode metadata"));
241 /* revalidate/getattr then populate from inode */
242 } /* BB add else when above is implemented */
243 ea_name += 5; /* skip past user. prefix */
244 rc = CIFSSMBQueryEA(xid, pTcon, full_path, ea_name, ea_value,
245 buf_size, cifs_sb->local_nls,
246 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
247 } else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) {
248 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
249 goto get_ea_exit;
250
251 ea_name += 4; /* skip past os2. prefix */
252 rc = CIFSSMBQueryEA(xid, pTcon, full_path, ea_name, ea_value,
253 buf_size, cifs_sb->local_nls,
254 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
255 } else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
256 strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
257 #ifdef CONFIG_CIFS_POSIX
258 if (sb->s_flags & MS_POSIXACL)
259 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
260 ea_value, buf_size, ACL_TYPE_ACCESS,
261 cifs_sb->local_nls,
262 cifs_sb->mnt_cifs_flags &
263 CIFS_MOUNT_MAP_SPECIAL_CHR);
264 #ifdef CONFIG_CIFS_EXPERIMENTAL
265 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
266 __u16 fid;
267 int oplock = 0;
268 struct cifs_ntsd *pacl = NULL;
269 __u32 buflen = 0;
270 if (experimEnabled)
271 rc = CIFSSMBOpen(xid, pTcon, full_path,
272 FILE_OPEN, GENERIC_READ, 0, &fid,
273 &oplock, NULL, cifs_sb->local_nls,
274 cifs_sb->mnt_cifs_flags &
275 CIFS_MOUNT_MAP_SPECIAL_CHR);
276 /* else rc is EOPNOTSUPP from above */
277
278 if (rc == 0) {
279 rc = CIFSSMBGetCIFSACL(xid, pTcon, fid, &pacl,
280 &buflen);
281 CIFSSMBClose(xid, pTcon, fid);
282 }
283 }
284 #endif /* EXPERIMENTAL */
285 #else
286 cFYI(1, ("query POSIX ACL not supported yet"));
287 #endif /* CONFIG_CIFS_POSIX */
288 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
289 strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
290 #ifdef CONFIG_CIFS_POSIX
291 if (sb->s_flags & MS_POSIXACL)
292 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
293 ea_value, buf_size, ACL_TYPE_DEFAULT,
294 cifs_sb->local_nls,
295 cifs_sb->mnt_cifs_flags &
296 CIFS_MOUNT_MAP_SPECIAL_CHR);
297 #else
298 cFYI(1, ("query POSIX default ACL not supported yet"));
299 #endif
300 } else if (strncmp(ea_name,
301 CIFS_XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
302 cFYI(1, ("Trusted xattr namespace not supported yet"));
303 } else if (strncmp(ea_name,
304 CIFS_XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
305 cFYI(1, ("Security xattr namespace not supported yet"));
306 } else
307 cFYI(1,
308 ("illegal xattr request %s (only user namespace supported)",
309 ea_name));
310
311 /* We could add an additional check for streams ie
312 if proc/fs/cifs/streamstoxattr is set then
313 search server for EAs or streams to
314 returns as xattrs */
315
316 if (rc == -EINVAL)
317 rc = -EOPNOTSUPP;
318
319 get_ea_exit:
320 kfree(full_path);
321 FreeXid(xid);
322 #endif
323 return rc;
324 }
325
cifs_listxattr(struct dentry * direntry,char * data,size_t buf_size)326 ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
327 {
328 ssize_t rc = -EOPNOTSUPP;
329 #ifdef CONFIG_CIFS_XATTR
330 int xid;
331 struct cifs_sb_info *cifs_sb;
332 struct cifsTconInfo *pTcon;
333 struct super_block *sb;
334 char *full_path;
335
336 if (direntry == NULL)
337 return -EIO;
338 if (direntry->d_inode == NULL)
339 return -EIO;
340 sb = direntry->d_inode->i_sb;
341 if (sb == NULL)
342 return -EIO;
343
344 cifs_sb = CIFS_SB(sb);
345 pTcon = cifs_sb->tcon;
346
347 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
348 return -EOPNOTSUPP;
349
350 xid = GetXid();
351
352 full_path = build_path_from_dentry(direntry);
353 if (full_path == NULL) {
354 FreeXid(xid);
355 return -ENOMEM;
356 }
357 /* return dos attributes as pseudo xattr */
358 /* return alt name if available as pseudo attr */
359
360 /* if proc/fs/cifs/streamstoxattr is set then
361 search server for EAs or streams to
362 returns as xattrs */
363 rc = CIFSSMBQAllEAs(xid, pTcon, full_path, data, buf_size,
364 cifs_sb->local_nls,
365 cifs_sb->mnt_cifs_flags &
366 CIFS_MOUNT_MAP_SPECIAL_CHR);
367
368 kfree(full_path);
369 FreeXid(xid);
370 #endif
371 return rc;
372 }
373