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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 <linux/xattr.h>
26#include "cifsfs.h"
27#include "cifspdu.h"
28#include "cifsglob.h"
29#include "cifsproto.h"
30#include "cifs_debug.h"
31
32#define MAX_EA_VALUE_SIZE 65535
33#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
34#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
35
36/* BB need to add server (Samba e.g) support for security and trusted prefix */
37
38int cifs_removexattr(struct dentry *direntry, const char *ea_name)
39{
40 int rc = -EOPNOTSUPP;
41#ifdef CONFIG_CIFS_XATTR
42 unsigned int xid;
43 struct cifs_sb_info *cifs_sb;
44 struct tcon_link *tlink;
45 struct cifs_tcon *pTcon;
46 struct super_block *sb;
47 char *full_path = NULL;
48
49 if (direntry == NULL)
50 return -EIO;
51 if (direntry->d_inode == NULL)
52 return -EIO;
53 sb = direntry->d_inode->i_sb;
54 if (sb == NULL)
55 return -EIO;
56
57 cifs_sb = CIFS_SB(sb);
58 tlink = cifs_sb_tlink(cifs_sb);
59 if (IS_ERR(tlink))
60 return PTR_ERR(tlink);
61 pTcon = tlink_tcon(tlink);
62
63 xid = get_xid();
64
65 full_path = build_path_from_dentry(direntry);
66 if (full_path == NULL) {
67 rc = -ENOMEM;
68 goto remove_ea_exit;
69 }
70 if (ea_name == NULL) {
71 cifs_dbg(FYI, "Null xattr names not supported\n");
72 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
73 && (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
74 cifs_dbg(FYI,
75 "illegal xattr request %s (only user namespace supported)\n",
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 += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
85 if (pTcon->ses->server->ops->set_EA)
86 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
87 full_path, ea_name, NULL, (__u16)0,
88 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
89 CIFS_MOUNT_MAP_SPECIAL_CHR);
90 }
91remove_ea_exit:
92 kfree(full_path);
93 free_xid(xid);
94 cifs_put_tlink(tlink);
95#endif
96 return rc;
97}
98
99int cifs_setxattr(struct dentry *direntry, const char *ea_name,
100 const void *ea_value, size_t value_size, int flags)
101{
102 int rc = -EOPNOTSUPP;
103#ifdef CONFIG_CIFS_XATTR
104 unsigned int xid;
105 struct cifs_sb_info *cifs_sb;
106 struct tcon_link *tlink;
107 struct cifs_tcon *pTcon;
108 struct super_block *sb;
109 char *full_path;
110
111 if (direntry == NULL)
112 return -EIO;
113 if (direntry->d_inode == NULL)
114 return -EIO;
115 sb = direntry->d_inode->i_sb;
116 if (sb == NULL)
117 return -EIO;
118
119 cifs_sb = CIFS_SB(sb);
120 tlink = cifs_sb_tlink(cifs_sb);
121 if (IS_ERR(tlink))
122 return PTR_ERR(tlink);
123 pTcon = tlink_tcon(tlink);
124
125 xid = get_xid();
126
127 full_path = build_path_from_dentry(direntry);
128 if (full_path == NULL) {
129 rc = -ENOMEM;
130 goto set_ea_exit;
131 }
132 /* return dos attributes as pseudo xattr */
133 /* return alt name if available as pseudo attr */
134
135 /* if proc/fs/cifs/streamstoxattr is set then
136 search server for EAs or streams to
137 returns as xattrs */
138 if (value_size > MAX_EA_VALUE_SIZE) {
139 cifs_dbg(FYI, "size of EA value too large\n");
140 rc = -EOPNOTSUPP;
141 goto set_ea_exit;
142 }
143
144 if (ea_name == NULL) {
145 cifs_dbg(FYI, "Null xattr names not supported\n");
146 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
147 == 0) {
148 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
149 goto set_ea_exit;
150 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
151 cifs_dbg(FYI, "attempt to set cifs inode metadata\n");
152
153 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
154 if (pTcon->ses->server->ops->set_EA)
155 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
156 full_path, ea_name, ea_value, (__u16)value_size,
157 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
158 CIFS_MOUNT_MAP_SPECIAL_CHR);
159 } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
160 == 0) {
161 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
162 goto set_ea_exit;
163
164 ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
165 if (pTcon->ses->server->ops->set_EA)
166 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
167 full_path, ea_name, ea_value, (__u16)value_size,
168 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
169 CIFS_MOUNT_MAP_SPECIAL_CHR);
170 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
171 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
172#ifdef CONFIG_CIFS_ACL
173 struct cifs_ntsd *pacl;
174 pacl = kmalloc(value_size, GFP_KERNEL);
175 if (!pacl) {
176 rc = -ENOMEM;
177 } else {
178 memcpy(pacl, ea_value, value_size);
179 if (pTcon->ses->server->ops->set_acl)
180 rc = pTcon->ses->server->ops->set_acl(pacl,
181 value_size, direntry->d_inode,
182 full_path, CIFS_ACL_DACL);
183 else
184 rc = -EOPNOTSUPP;
185 if (rc == 0) /* force revalidate of the inode */
186 CIFS_I(direntry->d_inode)->time = 0;
187 kfree(pacl);
188 }
189#else
190 cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
191#endif /* CONFIG_CIFS_ACL */
192 } else {
193 int temp;
194 temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
195 strlen(POSIX_ACL_XATTR_ACCESS));
196 if (temp == 0) {
197#ifdef CONFIG_CIFS_POSIX
198 if (sb->s_flags & MS_POSIXACL)
199 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
200 ea_value, (const int)value_size,
201 ACL_TYPE_ACCESS, cifs_sb->local_nls,
202 cifs_sb->mnt_cifs_flags &
203 CIFS_MOUNT_MAP_SPECIAL_CHR);
204 cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
205#else
206 cifs_dbg(FYI, "set POSIX ACL not supported\n");
207#endif
208 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
209 strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
210#ifdef CONFIG_CIFS_POSIX
211 if (sb->s_flags & MS_POSIXACL)
212 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
213 ea_value, (const int)value_size,
214 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
215 cifs_sb->mnt_cifs_flags &
216 CIFS_MOUNT_MAP_SPECIAL_CHR);
217 cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
218#else
219 cifs_dbg(FYI, "set default POSIX ACL not supported\n");
220#endif
221 } else {
222 cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
223 ea_name);
224 /* BB what if no namespace prefix? */
225 /* Should we just pass them to server, except for
226 system and perhaps security prefixes? */
227 }
228 }
229
230set_ea_exit:
231 kfree(full_path);
232 free_xid(xid);
233 cifs_put_tlink(tlink);
234#endif
235 return rc;
236}
237
238ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
239 void *ea_value, size_t buf_size)
240{
241 ssize_t rc = -EOPNOTSUPP;
242#ifdef CONFIG_CIFS_XATTR
243 unsigned int xid;
244 struct cifs_sb_info *cifs_sb;
245 struct tcon_link *tlink;
246 struct cifs_tcon *pTcon;
247 struct super_block *sb;
248 char *full_path;
249
250 if (direntry == NULL)
251 return -EIO;
252 if (direntry->d_inode == NULL)
253 return -EIO;
254 sb = direntry->d_inode->i_sb;
255 if (sb == NULL)
256 return -EIO;
257
258 cifs_sb = CIFS_SB(sb);
259 tlink = cifs_sb_tlink(cifs_sb);
260 if (IS_ERR(tlink))
261 return PTR_ERR(tlink);
262 pTcon = tlink_tcon(tlink);
263
264 xid = get_xid();
265
266 full_path = build_path_from_dentry(direntry);
267 if (full_path == NULL) {
268 rc = -ENOMEM;
269 goto get_ea_exit;
270 }
271 /* return dos attributes as pseudo xattr */
272 /* return alt name if available as pseudo attr */
273 if (ea_name == NULL) {
274 cifs_dbg(FYI, "Null xattr names not supported\n");
275 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
276 == 0) {
277 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
278 goto get_ea_exit;
279
280 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
281 cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
282 /* revalidate/getattr then populate from inode */
283 } /* BB add else when above is implemented */
284 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
285 if (pTcon->ses->server->ops->query_all_EAs)
286 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
287 full_path, ea_name, ea_value, buf_size,
288 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
289 CIFS_MOUNT_MAP_SPECIAL_CHR);
290 } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
291 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
292 goto get_ea_exit;
293
294 ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
295 if (pTcon->ses->server->ops->query_all_EAs)
296 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
297 full_path, ea_name, ea_value, buf_size,
298 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
299 CIFS_MOUNT_MAP_SPECIAL_CHR);
300 } else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
301 strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
302#ifdef CONFIG_CIFS_POSIX
303 if (sb->s_flags & MS_POSIXACL)
304 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
305 ea_value, buf_size, ACL_TYPE_ACCESS,
306 cifs_sb->local_nls,
307 cifs_sb->mnt_cifs_flags &
308 CIFS_MOUNT_MAP_SPECIAL_CHR);
309#else
310 cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
311#endif /* CONFIG_CIFS_POSIX */
312 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
313 strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
314#ifdef CONFIG_CIFS_POSIX
315 if (sb->s_flags & MS_POSIXACL)
316 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
317 ea_value, buf_size, ACL_TYPE_DEFAULT,
318 cifs_sb->local_nls,
319 cifs_sb->mnt_cifs_flags &
320 CIFS_MOUNT_MAP_SPECIAL_CHR);
321#else
322 cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
323#endif /* CONFIG_CIFS_POSIX */
324 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
325 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
326#ifdef CONFIG_CIFS_ACL
327 u32 acllen;
328 struct cifs_ntsd *pacl;
329
330 if (pTcon->ses->server->ops->get_acl == NULL)
331 goto get_ea_exit; /* rc already EOPNOTSUPP */
332
333 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
334 direntry->d_inode, full_path, &acllen);
335 if (IS_ERR(pacl)) {
336 rc = PTR_ERR(pacl);
337 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
338 __func__, rc);
339 } else {
340 if (ea_value) {
341 if (acllen > buf_size)
342 acllen = -ERANGE;
343 else
344 memcpy(ea_value, pacl, acllen);
345 }
346 rc = acllen;
347 kfree(pacl);
348 }
349#else
350 cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
351#endif /* CONFIG_CIFS_ACL */
352 } else if (strncmp(ea_name,
353 XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
354 cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
355 } else if (strncmp(ea_name,
356 XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
357 cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
358 } else
359 cifs_dbg(FYI,
360 "illegal xattr request %s (only user namespace supported)\n",
361 ea_name);
362
363 /* We could add an additional check for streams ie
364 if proc/fs/cifs/streamstoxattr is set then
365 search server for EAs or streams to
366 returns as xattrs */
367
368 if (rc == -EINVAL)
369 rc = -EOPNOTSUPP;
370
371get_ea_exit:
372 kfree(full_path);
373 free_xid(xid);
374 cifs_put_tlink(tlink);
375#endif
376 return rc;
377}
378
379ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
380{
381 ssize_t rc = -EOPNOTSUPP;
382#ifdef CONFIG_CIFS_XATTR
383 unsigned int xid;
384 struct cifs_sb_info *cifs_sb;
385 struct tcon_link *tlink;
386 struct cifs_tcon *pTcon;
387 struct super_block *sb;
388 char *full_path;
389
390 if (direntry == NULL)
391 return -EIO;
392 if (direntry->d_inode == NULL)
393 return -EIO;
394 sb = direntry->d_inode->i_sb;
395 if (sb == NULL)
396 return -EIO;
397
398 cifs_sb = CIFS_SB(sb);
399 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
400 return -EOPNOTSUPP;
401
402 tlink = cifs_sb_tlink(cifs_sb);
403 if (IS_ERR(tlink))
404 return PTR_ERR(tlink);
405 pTcon = tlink_tcon(tlink);
406
407 xid = get_xid();
408
409 full_path = build_path_from_dentry(direntry);
410 if (full_path == NULL) {
411 rc = -ENOMEM;
412 goto list_ea_exit;
413 }
414 /* return dos attributes as pseudo xattr */
415 /* return alt name if available as pseudo attr */
416
417 /* if proc/fs/cifs/streamstoxattr is set then
418 search server for EAs or streams to
419 returns as xattrs */
420
421 if (pTcon->ses->server->ops->query_all_EAs)
422 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
423 full_path, NULL, data, buf_size,
424 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
425 CIFS_MOUNT_MAP_SPECIAL_CHR);
426list_ea_exit:
427 kfree(full_path);
428 free_xid(xid);
429 cifs_put_tlink(tlink);
430#endif
431 return rc;
432}