Loading...
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 *
4 * Copyright (c) International Business Machines Corp., 2003, 2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 */
8
9#include <linux/fs.h>
10#include <linux/posix_acl_xattr.h>
11#include <linux/slab.h>
12#include <linux/xattr.h>
13#include "cifsfs.h"
14#include "cifspdu.h"
15#include "cifsglob.h"
16#include "cifsproto.h"
17#include "cifs_debug.h"
18#include "cifs_fs_sb.h"
19#include "cifs_unicode.h"
20#include "cifs_ioctl.h"
21
22#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
23#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
24#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
25#define CIFS_XATTR_CIFS_NTSD_FULL "system.cifs_ntsd_full" /* owner/DACL/SACL */
26#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
27#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
28/*
29 * Although these three are just aliases for the above, need to move away from
30 * confusing users and using the 20+ year old term 'cifs' when it is no longer
31 * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
32 */
33#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
34#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
35#define SMB3_XATTR_CIFS_NTSD_FULL "system.smb3_ntsd_full" /* owner/DACL/SACL */
36#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
37#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
38/* BB need to add server (Samba e.g) support for security and trusted prefix */
39
40enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
41 XATTR_CIFS_NTSD, XATTR_CIFS_NTSD_FULL };
42
43static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
44 struct inode *inode, const char *full_path,
45 const void *value, size_t size)
46{
47 ssize_t rc = -EOPNOTSUPP;
48 __u32 *pattrib = (__u32 *)value;
49 __u32 attrib;
50 FILE_BASIC_INFO info_buf;
51
52 if ((value == NULL) || (size != sizeof(__u32)))
53 return -ERANGE;
54
55 memset(&info_buf, 0, sizeof(info_buf));
56 attrib = *pattrib;
57 info_buf.Attributes = cpu_to_le32(attrib);
58 if (pTcon->ses->server->ops->set_file_info)
59 rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
60 &info_buf, xid);
61 if (rc == 0)
62 CIFS_I(inode)->cifsAttrs = attrib;
63
64 return rc;
65}
66
67static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
68 struct inode *inode, const char *full_path,
69 const void *value, size_t size)
70{
71 ssize_t rc = -EOPNOTSUPP;
72 __u64 *pcreation_time = (__u64 *)value;
73 __u64 creation_time;
74 FILE_BASIC_INFO info_buf;
75
76 if ((value == NULL) || (size != sizeof(__u64)))
77 return -ERANGE;
78
79 memset(&info_buf, 0, sizeof(info_buf));
80 creation_time = *pcreation_time;
81 info_buf.CreationTime = cpu_to_le64(creation_time);
82 if (pTcon->ses->server->ops->set_file_info)
83 rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
84 &info_buf, xid);
85 if (rc == 0)
86 CIFS_I(inode)->createtime = creation_time;
87
88 return rc;
89}
90
91static int cifs_xattr_set(const struct xattr_handler *handler,
92 struct user_namespace *mnt_userns,
93 struct dentry *dentry, struct inode *inode,
94 const char *name, const void *value,
95 size_t size, int flags)
96{
97 int rc = -EOPNOTSUPP;
98 unsigned int xid;
99 struct super_block *sb = dentry->d_sb;
100 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
101 struct tcon_link *tlink;
102 struct cifs_tcon *pTcon;
103 const char *full_path;
104 void *page;
105
106 tlink = cifs_sb_tlink(cifs_sb);
107 if (IS_ERR(tlink))
108 return PTR_ERR(tlink);
109 pTcon = tlink_tcon(tlink);
110
111 xid = get_xid();
112 page = alloc_dentry_path();
113
114 full_path = build_path_from_dentry(dentry, page);
115 if (IS_ERR(full_path)) {
116 rc = PTR_ERR(full_path);
117 goto out;
118 }
119 /* return dos attributes as pseudo xattr */
120 /* return alt name if available as pseudo attr */
121
122 /* if proc/fs/cifs/streamstoxattr is set then
123 search server for EAs or streams to
124 returns as xattrs */
125 if (size > MAX_EA_VALUE_SIZE) {
126 cifs_dbg(FYI, "size of EA value too large\n");
127 rc = -EOPNOTSUPP;
128 goto out;
129 }
130
131 switch (handler->flags) {
132 case XATTR_USER:
133 cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
134 if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
135 (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
136 rc = cifs_attrib_set(xid, pTcon, inode, full_path,
137 value, size);
138 if (rc == 0) /* force revalidate of the inode */
139 CIFS_I(inode)->time = 0;
140 break;
141 } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
142 (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
143 rc = cifs_creation_time_set(xid, pTcon, inode,
144 full_path, value, size);
145 if (rc == 0) /* force revalidate of the inode */
146 CIFS_I(inode)->time = 0;
147 break;
148 }
149
150 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
151 goto out;
152
153 if (pTcon->ses->server->ops->set_EA)
154 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
155 full_path, name, value, (__u16)size,
156 cifs_sb->local_nls, cifs_sb);
157 break;
158
159 case XATTR_CIFS_ACL:
160 case XATTR_CIFS_NTSD:
161 case XATTR_CIFS_NTSD_FULL: {
162 struct cifs_ntsd *pacl;
163
164 if (!value)
165 goto out;
166 pacl = kmalloc(size, GFP_KERNEL);
167 if (!pacl) {
168 rc = -ENOMEM;
169 } else {
170 memcpy(pacl, value, size);
171 if (pTcon->ses->server->ops->set_acl) {
172 int aclflags = 0;
173 rc = 0;
174
175 switch (handler->flags) {
176 case XATTR_CIFS_NTSD_FULL:
177 aclflags = (CIFS_ACL_OWNER |
178 CIFS_ACL_GROUP |
179 CIFS_ACL_DACL |
180 CIFS_ACL_SACL);
181 break;
182 case XATTR_CIFS_NTSD:
183 aclflags = (CIFS_ACL_OWNER |
184 CIFS_ACL_GROUP |
185 CIFS_ACL_DACL);
186 break;
187 case XATTR_CIFS_ACL:
188 default:
189 aclflags = CIFS_ACL_DACL;
190 }
191
192 rc = pTcon->ses->server->ops->set_acl(pacl,
193 size, inode, full_path, aclflags);
194 } else {
195 rc = -EOPNOTSUPP;
196 }
197 if (rc == 0) /* force revalidate of the inode */
198 CIFS_I(inode)->time = 0;
199 kfree(pacl);
200 }
201 break;
202 }
203 }
204
205out:
206 free_dentry_path(page);
207 free_xid(xid);
208 cifs_put_tlink(tlink);
209 return rc;
210}
211
212static int cifs_attrib_get(struct dentry *dentry,
213 struct inode *inode, void *value,
214 size_t size)
215{
216 ssize_t rc;
217 __u32 *pattribute;
218
219 rc = cifs_revalidate_dentry_attr(dentry);
220
221 if (rc)
222 return rc;
223
224 if ((value == NULL) || (size == 0))
225 return sizeof(__u32);
226 else if (size < sizeof(__u32))
227 return -ERANGE;
228
229 /* return dos attributes as pseudo xattr */
230 pattribute = (__u32 *)value;
231 *pattribute = CIFS_I(inode)->cifsAttrs;
232
233 return sizeof(__u32);
234}
235
236static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
237 void *value, size_t size)
238{
239 ssize_t rc;
240 __u64 *pcreatetime;
241
242 rc = cifs_revalidate_dentry_attr(dentry);
243 if (rc)
244 return rc;
245
246 if ((value == NULL) || (size == 0))
247 return sizeof(__u64);
248 else if (size < sizeof(__u64))
249 return -ERANGE;
250
251 /* return dos attributes as pseudo xattr */
252 pcreatetime = (__u64 *)value;
253 *pcreatetime = CIFS_I(inode)->createtime;
254 return sizeof(__u64);
255}
256
257
258static int cifs_xattr_get(const struct xattr_handler *handler,
259 struct dentry *dentry, struct inode *inode,
260 const char *name, void *value, size_t size)
261{
262 ssize_t rc = -EOPNOTSUPP;
263 unsigned int xid;
264 struct super_block *sb = dentry->d_sb;
265 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
266 struct tcon_link *tlink;
267 struct cifs_tcon *pTcon;
268 const char *full_path;
269 void *page;
270
271 tlink = cifs_sb_tlink(cifs_sb);
272 if (IS_ERR(tlink))
273 return PTR_ERR(tlink);
274 pTcon = tlink_tcon(tlink);
275
276 xid = get_xid();
277 page = alloc_dentry_path();
278
279 full_path = build_path_from_dentry(dentry, page);
280 if (IS_ERR(full_path)) {
281 rc = PTR_ERR(full_path);
282 goto out;
283 }
284
285 /* return alt name if available as pseudo attr */
286 switch (handler->flags) {
287 case XATTR_USER:
288 cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
289 if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
290 (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
291 rc = cifs_attrib_get(dentry, inode, value, size);
292 break;
293 } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
294 (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
295 rc = cifs_creation_time_get(dentry, inode, value, size);
296 break;
297 }
298
299 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
300 goto out;
301
302 if (pTcon->ses->server->ops->query_all_EAs)
303 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
304 full_path, name, value, size, cifs_sb);
305 break;
306
307 case XATTR_CIFS_ACL:
308 case XATTR_CIFS_NTSD:
309 case XATTR_CIFS_NTSD_FULL: {
310 /*
311 * fetch owner, DACL, and SACL if asked for full descriptor,
312 * fetch owner and DACL otherwise
313 */
314 u32 acllen, extra_info;
315 struct cifs_ntsd *pacl;
316
317 if (pTcon->ses->server->ops->get_acl == NULL)
318 goto out; /* rc already EOPNOTSUPP */
319
320 if (handler->flags == XATTR_CIFS_NTSD_FULL) {
321 extra_info = SACL_SECINFO;
322 } else {
323 extra_info = 0;
324 }
325 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
326 inode, full_path, &acllen, extra_info);
327 if (IS_ERR(pacl)) {
328 rc = PTR_ERR(pacl);
329 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
330 __func__, rc);
331 } else {
332 if (value) {
333 if (acllen > size)
334 acllen = -ERANGE;
335 else
336 memcpy(value, pacl, acllen);
337 }
338 rc = acllen;
339 kfree(pacl);
340 }
341 break;
342 }
343 }
344
345 /* We could add an additional check for streams ie
346 if proc/fs/cifs/streamstoxattr is set then
347 search server for EAs or streams to
348 returns as xattrs */
349
350 if (rc == -EINVAL)
351 rc = -EOPNOTSUPP;
352
353out:
354 free_dentry_path(page);
355 free_xid(xid);
356 cifs_put_tlink(tlink);
357 return rc;
358}
359
360ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
361{
362 ssize_t rc = -EOPNOTSUPP;
363 unsigned int xid;
364 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
365 struct tcon_link *tlink;
366 struct cifs_tcon *pTcon;
367 const char *full_path;
368 void *page;
369
370 if (unlikely(cifs_forced_shutdown(cifs_sb)))
371 return -EIO;
372
373 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
374 return -EOPNOTSUPP;
375
376 tlink = cifs_sb_tlink(cifs_sb);
377 if (IS_ERR(tlink))
378 return PTR_ERR(tlink);
379 pTcon = tlink_tcon(tlink);
380
381 xid = get_xid();
382 page = alloc_dentry_path();
383
384 full_path = build_path_from_dentry(direntry, page);
385 if (IS_ERR(full_path)) {
386 rc = PTR_ERR(full_path);
387 goto list_ea_exit;
388 }
389 /* return dos attributes as pseudo xattr */
390 /* return alt name if available as pseudo attr */
391
392 /* if proc/fs/cifs/streamstoxattr is set then
393 search server for EAs or streams to
394 returns as xattrs */
395
396 if (pTcon->ses->server->ops->query_all_EAs)
397 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
398 full_path, NULL, data, buf_size, cifs_sb);
399list_ea_exit:
400 free_dentry_path(page);
401 free_xid(xid);
402 cifs_put_tlink(tlink);
403 return rc;
404}
405
406static const struct xattr_handler cifs_user_xattr_handler = {
407 .prefix = XATTR_USER_PREFIX,
408 .flags = XATTR_USER,
409 .get = cifs_xattr_get,
410 .set = cifs_xattr_set,
411};
412
413/* os2.* attributes are treated like user.* attributes */
414static const struct xattr_handler cifs_os2_xattr_handler = {
415 .prefix = XATTR_OS2_PREFIX,
416 .flags = XATTR_USER,
417 .get = cifs_xattr_get,
418 .set = cifs_xattr_set,
419};
420
421static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
422 .name = CIFS_XATTR_CIFS_ACL,
423 .flags = XATTR_CIFS_ACL,
424 .get = cifs_xattr_get,
425 .set = cifs_xattr_set,
426};
427
428/*
429 * Although this is just an alias for the above, need to move away from
430 * confusing users and using the 20 year old term 'cifs' when it is no
431 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
432 * SMB3 and later are highly secure.
433 */
434static const struct xattr_handler smb3_acl_xattr_handler = {
435 .name = SMB3_XATTR_CIFS_ACL,
436 .flags = XATTR_CIFS_ACL,
437 .get = cifs_xattr_get,
438 .set = cifs_xattr_set,
439};
440
441static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
442 .name = CIFS_XATTR_CIFS_NTSD,
443 .flags = XATTR_CIFS_NTSD,
444 .get = cifs_xattr_get,
445 .set = cifs_xattr_set,
446};
447
448/*
449 * Although this is just an alias for the above, need to move away from
450 * confusing users and using the 20 year old term 'cifs' when it is no
451 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
452 * SMB3 and later are highly secure.
453 */
454static const struct xattr_handler smb3_ntsd_xattr_handler = {
455 .name = SMB3_XATTR_CIFS_NTSD,
456 .flags = XATTR_CIFS_NTSD,
457 .get = cifs_xattr_get,
458 .set = cifs_xattr_set,
459};
460
461static const struct xattr_handler cifs_cifs_ntsd_full_xattr_handler = {
462 .name = CIFS_XATTR_CIFS_NTSD_FULL,
463 .flags = XATTR_CIFS_NTSD_FULL,
464 .get = cifs_xattr_get,
465 .set = cifs_xattr_set,
466};
467
468/*
469 * Although this is just an alias for the above, need to move away from
470 * confusing users and using the 20 year old term 'cifs' when it is no
471 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
472 * SMB3 and later are highly secure.
473 */
474static const struct xattr_handler smb3_ntsd_full_xattr_handler = {
475 .name = SMB3_XATTR_CIFS_NTSD_FULL,
476 .flags = XATTR_CIFS_NTSD_FULL,
477 .get = cifs_xattr_get,
478 .set = cifs_xattr_set,
479};
480
481const struct xattr_handler *cifs_xattr_handlers[] = {
482 &cifs_user_xattr_handler,
483 &cifs_os2_xattr_handler,
484 &cifs_cifs_acl_xattr_handler,
485 &smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
486 &cifs_cifs_ntsd_xattr_handler,
487 &smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
488 &cifs_cifs_ntsd_full_xattr_handler,
489 &smb3_ntsd_full_xattr_handler, /* alias for above since avoiding "cifs" */
490#ifdef CONFIG_FS_POSIX_ACL
491 &posix_acl_access_xattr_handler,
492 &posix_acl_default_xattr_handler,
493#endif
494 NULL
495};
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}