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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#include "cifs_fs_sb.h"
32#include "cifs_unicode.h"
33
34#define MAX_EA_VALUE_SIZE 65535
35#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
36#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
37
38/* BB need to add server (Samba e.g) support for security and trusted prefix */
39
40int cifs_removexattr(struct dentry *direntry, const char *ea_name)
41{
42 int rc = -EOPNOTSUPP;
43#ifdef CONFIG_CIFS_XATTR
44 unsigned int xid;
45 struct cifs_sb_info *cifs_sb;
46 struct tcon_link *tlink;
47 struct cifs_tcon *pTcon;
48 struct super_block *sb;
49 char *full_path = NULL;
50
51 if (direntry == NULL)
52 return -EIO;
53 if (d_really_is_negative(direntry))
54 return -EIO;
55 sb = d_inode(direntry)->i_sb;
56 if (sb == NULL)
57 return -EIO;
58
59 cifs_sb = CIFS_SB(sb);
60 tlink = cifs_sb_tlink(cifs_sb);
61 if (IS_ERR(tlink))
62 return PTR_ERR(tlink);
63 pTcon = tlink_tcon(tlink);
64
65 xid = get_xid();
66
67 full_path = build_path_from_dentry(direntry);
68 if (full_path == NULL) {
69 rc = -ENOMEM;
70 goto remove_ea_exit;
71 }
72 if (ea_name == NULL) {
73 cifs_dbg(FYI, "Null xattr names not supported\n");
74 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
75 && (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
76 cifs_dbg(FYI,
77 "illegal xattr request %s (only user namespace supported)\n",
78 ea_name);
79 /* BB what if no namespace prefix? */
80 /* Should we just pass them to server, except for
81 system and perhaps security prefixes? */
82 } else {
83 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
84 goto remove_ea_exit;
85
86 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
87 if (pTcon->ses->server->ops->set_EA)
88 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
89 full_path, ea_name, NULL, (__u16)0,
90 cifs_sb->local_nls, cifs_remap(cifs_sb));
91 }
92remove_ea_exit:
93 kfree(full_path);
94 free_xid(xid);
95 cifs_put_tlink(tlink);
96#endif
97 return rc;
98}
99
100int cifs_setxattr(struct dentry *direntry, const char *ea_name,
101 const void *ea_value, size_t value_size, int flags)
102{
103 int rc = -EOPNOTSUPP;
104#ifdef CONFIG_CIFS_XATTR
105 unsigned int xid;
106 struct cifs_sb_info *cifs_sb;
107 struct tcon_link *tlink;
108 struct cifs_tcon *pTcon;
109 struct super_block *sb;
110 char *full_path;
111
112 if (direntry == NULL)
113 return -EIO;
114 if (d_really_is_negative(direntry))
115 return -EIO;
116 sb = d_inode(direntry)->i_sb;
117 if (sb == NULL)
118 return -EIO;
119
120 cifs_sb = CIFS_SB(sb);
121 tlink = cifs_sb_tlink(cifs_sb);
122 if (IS_ERR(tlink))
123 return PTR_ERR(tlink);
124 pTcon = tlink_tcon(tlink);
125
126 xid = get_xid();
127
128 full_path = build_path_from_dentry(direntry);
129 if (full_path == NULL) {
130 rc = -ENOMEM;
131 goto set_ea_exit;
132 }
133 /* return dos attributes as pseudo xattr */
134 /* return alt name if available as pseudo attr */
135
136 /* if proc/fs/cifs/streamstoxattr is set then
137 search server for EAs or streams to
138 returns as xattrs */
139 if (value_size > MAX_EA_VALUE_SIZE) {
140 cifs_dbg(FYI, "size of EA value too large\n");
141 rc = -EOPNOTSUPP;
142 goto set_ea_exit;
143 }
144
145 if (ea_name == NULL) {
146 cifs_dbg(FYI, "Null xattr names not supported\n");
147 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
148 == 0) {
149 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
150 goto set_ea_exit;
151 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
152 cifs_dbg(FYI, "attempt to set cifs inode metadata\n");
153
154 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
155 if (pTcon->ses->server->ops->set_EA)
156 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
157 full_path, ea_name, ea_value, (__u16)value_size,
158 cifs_sb->local_nls, cifs_remap(cifs_sb));
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_remap(cifs_sb));
169 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
170 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
171#ifdef CONFIG_CIFS_ACL
172 struct cifs_ntsd *pacl;
173 pacl = kmalloc(value_size, GFP_KERNEL);
174 if (!pacl) {
175 rc = -ENOMEM;
176 } else {
177 memcpy(pacl, ea_value, value_size);
178 if (pTcon->ses->server->ops->set_acl)
179 rc = pTcon->ses->server->ops->set_acl(pacl,
180 value_size, d_inode(direntry),
181 full_path, CIFS_ACL_DACL);
182 else
183 rc = -EOPNOTSUPP;
184 if (rc == 0) /* force revalidate of the inode */
185 CIFS_I(d_inode(direntry))->time = 0;
186 kfree(pacl);
187 }
188#else
189 cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
190#endif /* CONFIG_CIFS_ACL */
191 } else {
192 int temp;
193 temp = strncmp(ea_name, XATTR_NAME_POSIX_ACL_ACCESS,
194 strlen(XATTR_NAME_POSIX_ACL_ACCESS));
195 if (temp == 0) {
196#ifdef CONFIG_CIFS_POSIX
197 if (sb->s_flags & MS_POSIXACL)
198 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
199 ea_value, (const int)value_size,
200 ACL_TYPE_ACCESS, cifs_sb->local_nls,
201 cifs_remap(cifs_sb));
202 cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
203#else
204 cifs_dbg(FYI, "set POSIX ACL not supported\n");
205#endif
206 } else if (strncmp(ea_name, XATTR_NAME_POSIX_ACL_DEFAULT,
207 strlen(XATTR_NAME_POSIX_ACL_DEFAULT)) == 0) {
208#ifdef CONFIG_CIFS_POSIX
209 if (sb->s_flags & MS_POSIXACL)
210 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
211 ea_value, (const int)value_size,
212 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
213 cifs_remap(cifs_sb));
214 cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
215#else
216 cifs_dbg(FYI, "set default POSIX ACL not supported\n");
217#endif
218 } else {
219 cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
220 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 free_xid(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 unsigned 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 (d_really_is_negative(direntry))
250 return -EIO;
251 sb = d_inode(direntry)->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 = get_xid();
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 cifs_dbg(FYI, "Null xattr names not supported\n");
272 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
273 == 0) {
274 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
275 goto get_ea_exit;
276
277 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
278 cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
279 /* revalidate/getattr then populate from inode */
280 } /* BB add else when above is implemented */
281 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
282 if (pTcon->ses->server->ops->query_all_EAs)
283 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
284 full_path, ea_name, ea_value, buf_size,
285 cifs_sb->local_nls, cifs_remap(cifs_sb));
286 } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
287 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
288 goto get_ea_exit;
289
290 ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
291 if (pTcon->ses->server->ops->query_all_EAs)
292 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
293 full_path, ea_name, ea_value, buf_size,
294 cifs_sb->local_nls, cifs_remap(cifs_sb));
295 } else if (strncmp(ea_name, XATTR_NAME_POSIX_ACL_ACCESS,
296 strlen(XATTR_NAME_POSIX_ACL_ACCESS)) == 0) {
297#ifdef CONFIG_CIFS_POSIX
298 if (sb->s_flags & MS_POSIXACL)
299 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
300 ea_value, buf_size, ACL_TYPE_ACCESS,
301 cifs_sb->local_nls,
302 cifs_remap(cifs_sb));
303#else
304 cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
305#endif /* CONFIG_CIFS_POSIX */
306 } else if (strncmp(ea_name, XATTR_NAME_POSIX_ACL_DEFAULT,
307 strlen(XATTR_NAME_POSIX_ACL_DEFAULT)) == 0) {
308#ifdef CONFIG_CIFS_POSIX
309 if (sb->s_flags & MS_POSIXACL)
310 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
311 ea_value, buf_size, ACL_TYPE_DEFAULT,
312 cifs_sb->local_nls,
313 cifs_remap(cifs_sb));
314#else
315 cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
316#endif /* CONFIG_CIFS_POSIX */
317 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
318 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
319#ifdef CONFIG_CIFS_ACL
320 u32 acllen;
321 struct cifs_ntsd *pacl;
322
323 if (pTcon->ses->server->ops->get_acl == NULL)
324 goto get_ea_exit; /* rc already EOPNOTSUPP */
325
326 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
327 d_inode(direntry), full_path, &acllen);
328 if (IS_ERR(pacl)) {
329 rc = PTR_ERR(pacl);
330 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
331 __func__, rc);
332 } else {
333 if (ea_value) {
334 if (acllen > buf_size)
335 acllen = -ERANGE;
336 else
337 memcpy(ea_value, pacl, acllen);
338 }
339 rc = acllen;
340 kfree(pacl);
341 }
342#else
343 cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
344#endif /* CONFIG_CIFS_ACL */
345 } else if (strncmp(ea_name,
346 XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
347 cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
348 } else if (strncmp(ea_name,
349 XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
350 cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
351 } else
352 cifs_dbg(FYI,
353 "illegal xattr request %s (only user namespace supported)\n",
354 ea_name);
355
356 /* We could add an additional check for streams ie
357 if proc/fs/cifs/streamstoxattr is set then
358 search server for EAs or streams to
359 returns as xattrs */
360
361 if (rc == -EINVAL)
362 rc = -EOPNOTSUPP;
363
364get_ea_exit:
365 kfree(full_path);
366 free_xid(xid);
367 cifs_put_tlink(tlink);
368#endif
369 return rc;
370}
371
372ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
373{
374 ssize_t rc = -EOPNOTSUPP;
375#ifdef CONFIG_CIFS_XATTR
376 unsigned int xid;
377 struct cifs_sb_info *cifs_sb;
378 struct tcon_link *tlink;
379 struct cifs_tcon *pTcon;
380 struct super_block *sb;
381 char *full_path;
382
383 if (direntry == NULL)
384 return -EIO;
385 if (d_really_is_negative(direntry))
386 return -EIO;
387 sb = d_inode(direntry)->i_sb;
388 if (sb == NULL)
389 return -EIO;
390
391 cifs_sb = CIFS_SB(sb);
392 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
393 return -EOPNOTSUPP;
394
395 tlink = cifs_sb_tlink(cifs_sb);
396 if (IS_ERR(tlink))
397 return PTR_ERR(tlink);
398 pTcon = tlink_tcon(tlink);
399
400 xid = get_xid();
401
402 full_path = build_path_from_dentry(direntry);
403 if (full_path == NULL) {
404 rc = -ENOMEM;
405 goto list_ea_exit;
406 }
407 /* return dos attributes as pseudo xattr */
408 /* return alt name if available as pseudo attr */
409
410 /* if proc/fs/cifs/streamstoxattr is set then
411 search server for EAs or streams to
412 returns as xattrs */
413
414 if (pTcon->ses->server->ops->query_all_EAs)
415 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
416 full_path, NULL, data, buf_size,
417 cifs_sb->local_nls, cifs_remap(cifs_sb));
418list_ea_exit:
419 kfree(full_path);
420 free_xid(xid);
421 cifs_put_tlink(tlink);
422#endif
423 return rc;
424}
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#include "cifs_fs_sb.h"
32#include "cifs_unicode.h"
33
34#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
35#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
36#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
37#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
38#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
39/*
40 * Although these three are just aliases for the above, need to move away from
41 * confusing users and using the 20+ year old term 'cifs' when it is no longer
42 * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
43 */
44#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
45#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
46#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
47#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
48/* BB need to add server (Samba e.g) support for security and trusted prefix */
49
50enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
51 XATTR_CIFS_NTSD };
52
53static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
54 struct inode *inode, char *full_path,
55 const void *value, size_t size)
56{
57 ssize_t rc = -EOPNOTSUPP;
58 __u32 *pattrib = (__u32 *)value;
59 __u32 attrib;
60 FILE_BASIC_INFO info_buf;
61
62 if ((value == NULL) || (size != sizeof(__u32)))
63 return -ERANGE;
64
65 memset(&info_buf, 0, sizeof(info_buf));
66 attrib = *pattrib;
67 info_buf.Attributes = cpu_to_le32(attrib);
68 if (pTcon->ses->server->ops->set_file_info)
69 rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
70 &info_buf, xid);
71 if (rc == 0)
72 CIFS_I(inode)->cifsAttrs = attrib;
73
74 return rc;
75}
76
77static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
78 struct inode *inode, char *full_path,
79 const void *value, size_t size)
80{
81 ssize_t rc = -EOPNOTSUPP;
82 __u64 *pcreation_time = (__u64 *)value;
83 __u64 creation_time;
84 FILE_BASIC_INFO info_buf;
85
86 if ((value == NULL) || (size != sizeof(__u64)))
87 return -ERANGE;
88
89 memset(&info_buf, 0, sizeof(info_buf));
90 creation_time = *pcreation_time;
91 info_buf.CreationTime = cpu_to_le64(creation_time);
92 if (pTcon->ses->server->ops->set_file_info)
93 rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
94 &info_buf, xid);
95 if (rc == 0)
96 CIFS_I(inode)->createtime = creation_time;
97
98 return rc;
99}
100
101static int cifs_xattr_set(const struct xattr_handler *handler,
102 struct dentry *dentry, struct inode *inode,
103 const char *name, const void *value,
104 size_t size, int flags)
105{
106 int rc = -EOPNOTSUPP;
107 unsigned int xid;
108 struct super_block *sb = dentry->d_sb;
109 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
110 struct tcon_link *tlink;
111 struct cifs_tcon *pTcon;
112 char *full_path;
113
114 tlink = cifs_sb_tlink(cifs_sb);
115 if (IS_ERR(tlink))
116 return PTR_ERR(tlink);
117 pTcon = tlink_tcon(tlink);
118
119 xid = get_xid();
120
121 full_path = build_path_from_dentry(dentry);
122 if (full_path == NULL) {
123 rc = -ENOMEM;
124 goto out;
125 }
126 /* return dos attributes as pseudo xattr */
127 /* return alt name if available as pseudo attr */
128
129 /* if proc/fs/cifs/streamstoxattr is set then
130 search server for EAs or streams to
131 returns as xattrs */
132 if (size > MAX_EA_VALUE_SIZE) {
133 cifs_dbg(FYI, "size of EA value too large\n");
134 rc = -EOPNOTSUPP;
135 goto out;
136 }
137
138 switch (handler->flags) {
139 case XATTR_USER:
140 cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
141 if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
142 (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
143 rc = cifs_attrib_set(xid, pTcon, inode, full_path,
144 value, size);
145 if (rc == 0) /* force revalidate of the inode */
146 CIFS_I(inode)->time = 0;
147 break;
148 } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
149 (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
150 rc = cifs_creation_time_set(xid, pTcon, inode,
151 full_path, value, size);
152 if (rc == 0) /* force revalidate of the inode */
153 CIFS_I(inode)->time = 0;
154 break;
155 }
156
157 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
158 goto out;
159
160 if (pTcon->ses->server->ops->set_EA)
161 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
162 full_path, name, value, (__u16)size,
163 cifs_sb->local_nls, cifs_sb);
164 break;
165
166 case XATTR_CIFS_ACL:
167 case XATTR_CIFS_NTSD: {
168 struct cifs_ntsd *pacl;
169
170 if (!value)
171 goto out;
172 pacl = kmalloc(size, GFP_KERNEL);
173 if (!pacl) {
174 rc = -ENOMEM;
175 } else {
176 memcpy(pacl, value, size);
177 if (value &&
178 pTcon->ses->server->ops->set_acl) {
179 rc = 0;
180 if (handler->flags == XATTR_CIFS_NTSD) {
181 /* set owner and DACL */
182 rc = pTcon->ses->server->ops->set_acl(
183 pacl, size, inode,
184 full_path,
185 CIFS_ACL_OWNER);
186 }
187 if (rc == 0) {
188 /* set DACL */
189 rc = pTcon->ses->server->ops->set_acl(
190 pacl, size, inode,
191 full_path,
192 CIFS_ACL_DACL);
193 }
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 case XATTR_ACL_ACCESS:
205#ifdef CONFIG_CIFS_POSIX
206 if (!value)
207 goto out;
208 if (sb->s_flags & SB_POSIXACL)
209 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
210 value, (const int)size,
211 ACL_TYPE_ACCESS, cifs_sb->local_nls,
212 cifs_remap(cifs_sb));
213#endif /* CONFIG_CIFS_POSIX */
214 break;
215
216 case XATTR_ACL_DEFAULT:
217#ifdef CONFIG_CIFS_POSIX
218 if (!value)
219 goto out;
220 if (sb->s_flags & SB_POSIXACL)
221 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
222 value, (const int)size,
223 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
224 cifs_remap(cifs_sb));
225#endif /* CONFIG_CIFS_POSIX */
226 break;
227 }
228
229out:
230 kfree(full_path);
231 free_xid(xid);
232 cifs_put_tlink(tlink);
233 return rc;
234}
235
236static int cifs_attrib_get(struct dentry *dentry,
237 struct inode *inode, void *value,
238 size_t size)
239{
240 ssize_t rc;
241 __u32 *pattribute;
242
243 rc = cifs_revalidate_dentry_attr(dentry);
244
245 if (rc)
246 return rc;
247
248 if ((value == NULL) || (size == 0))
249 return sizeof(__u32);
250 else if (size < sizeof(__u32))
251 return -ERANGE;
252
253 /* return dos attributes as pseudo xattr */
254 pattribute = (__u32 *)value;
255 *pattribute = CIFS_I(inode)->cifsAttrs;
256
257 return sizeof(__u32);
258}
259
260static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
261 void *value, size_t size)
262{
263 ssize_t rc;
264 __u64 *pcreatetime;
265
266 rc = cifs_revalidate_dentry_attr(dentry);
267 if (rc)
268 return rc;
269
270 if ((value == NULL) || (size == 0))
271 return sizeof(__u64);
272 else if (size < sizeof(__u64))
273 return -ERANGE;
274
275 /* return dos attributes as pseudo xattr */
276 pcreatetime = (__u64 *)value;
277 *pcreatetime = CIFS_I(inode)->createtime;
278 return sizeof(__u64);
279}
280
281
282static int cifs_xattr_get(const struct xattr_handler *handler,
283 struct dentry *dentry, struct inode *inode,
284 const char *name, void *value, size_t size)
285{
286 ssize_t rc = -EOPNOTSUPP;
287 unsigned int xid;
288 struct super_block *sb = dentry->d_sb;
289 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
290 struct tcon_link *tlink;
291 struct cifs_tcon *pTcon;
292 char *full_path;
293
294 tlink = cifs_sb_tlink(cifs_sb);
295 if (IS_ERR(tlink))
296 return PTR_ERR(tlink);
297 pTcon = tlink_tcon(tlink);
298
299 xid = get_xid();
300
301 full_path = build_path_from_dentry(dentry);
302 if (full_path == NULL) {
303 rc = -ENOMEM;
304 goto out;
305 }
306
307 /* return alt name if available as pseudo attr */
308 switch (handler->flags) {
309 case XATTR_USER:
310 cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
311 if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
312 (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
313 rc = cifs_attrib_get(dentry, inode, value, size);
314 break;
315 } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
316 (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
317 rc = cifs_creation_time_get(dentry, inode, value, size);
318 break;
319 }
320
321 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
322 goto out;
323
324 if (pTcon->ses->server->ops->query_all_EAs)
325 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
326 full_path, name, value, size, cifs_sb);
327 break;
328
329 case XATTR_CIFS_ACL:
330 case XATTR_CIFS_NTSD: {
331 /* the whole ntsd is fetched regardless */
332 u32 acllen;
333 struct cifs_ntsd *pacl;
334
335 if (pTcon->ses->server->ops->get_acl == NULL)
336 goto out; /* rc already EOPNOTSUPP */
337
338 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
339 inode, full_path, &acllen);
340 if (IS_ERR(pacl)) {
341 rc = PTR_ERR(pacl);
342 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
343 __func__, rc);
344 } else {
345 if (value) {
346 if (acllen > size)
347 acllen = -ERANGE;
348 else
349 memcpy(value, pacl, acllen);
350 }
351 rc = acllen;
352 kfree(pacl);
353 }
354 break;
355 }
356
357 case XATTR_ACL_ACCESS:
358#ifdef CONFIG_CIFS_POSIX
359 if (sb->s_flags & SB_POSIXACL)
360 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
361 value, size, ACL_TYPE_ACCESS,
362 cifs_sb->local_nls,
363 cifs_remap(cifs_sb));
364#endif /* CONFIG_CIFS_POSIX */
365 break;
366
367 case XATTR_ACL_DEFAULT:
368#ifdef CONFIG_CIFS_POSIX
369 if (sb->s_flags & SB_POSIXACL)
370 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
371 value, size, ACL_TYPE_DEFAULT,
372 cifs_sb->local_nls,
373 cifs_remap(cifs_sb));
374#endif /* CONFIG_CIFS_POSIX */
375 break;
376 }
377
378 /* We could add an additional check for streams ie
379 if proc/fs/cifs/streamstoxattr is set then
380 search server for EAs or streams to
381 returns as xattrs */
382
383 if (rc == -EINVAL)
384 rc = -EOPNOTSUPP;
385
386out:
387 kfree(full_path);
388 free_xid(xid);
389 cifs_put_tlink(tlink);
390 return rc;
391}
392
393ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
394{
395 ssize_t rc = -EOPNOTSUPP;
396 unsigned int xid;
397 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
398 struct tcon_link *tlink;
399 struct cifs_tcon *pTcon;
400 char *full_path;
401
402 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
403 return -EOPNOTSUPP;
404
405 tlink = cifs_sb_tlink(cifs_sb);
406 if (IS_ERR(tlink))
407 return PTR_ERR(tlink);
408 pTcon = tlink_tcon(tlink);
409
410 xid = get_xid();
411
412 full_path = build_path_from_dentry(direntry);
413 if (full_path == NULL) {
414 rc = -ENOMEM;
415 goto list_ea_exit;
416 }
417 /* return dos attributes as pseudo xattr */
418 /* return alt name if available as pseudo attr */
419
420 /* if proc/fs/cifs/streamstoxattr is set then
421 search server for EAs or streams to
422 returns as xattrs */
423
424 if (pTcon->ses->server->ops->query_all_EAs)
425 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
426 full_path, NULL, data, buf_size, cifs_sb);
427list_ea_exit:
428 kfree(full_path);
429 free_xid(xid);
430 cifs_put_tlink(tlink);
431 return rc;
432}
433
434static const struct xattr_handler cifs_user_xattr_handler = {
435 .prefix = XATTR_USER_PREFIX,
436 .flags = XATTR_USER,
437 .get = cifs_xattr_get,
438 .set = cifs_xattr_set,
439};
440
441/* os2.* attributes are treated like user.* attributes */
442static const struct xattr_handler cifs_os2_xattr_handler = {
443 .prefix = XATTR_OS2_PREFIX,
444 .flags = XATTR_USER,
445 .get = cifs_xattr_get,
446 .set = cifs_xattr_set,
447};
448
449static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
450 .name = CIFS_XATTR_CIFS_ACL,
451 .flags = XATTR_CIFS_ACL,
452 .get = cifs_xattr_get,
453 .set = cifs_xattr_set,
454};
455
456/*
457 * Although this is just an alias for the above, need to move away from
458 * confusing users and using the 20 year old term 'cifs' when it is no
459 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
460 * SMB3 and later are highly secure.
461 */
462static const struct xattr_handler smb3_acl_xattr_handler = {
463 .name = SMB3_XATTR_CIFS_ACL,
464 .flags = XATTR_CIFS_ACL,
465 .get = cifs_xattr_get,
466 .set = cifs_xattr_set,
467};
468
469static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
470 .name = CIFS_XATTR_CIFS_NTSD,
471 .flags = XATTR_CIFS_NTSD,
472 .get = cifs_xattr_get,
473 .set = cifs_xattr_set,
474};
475
476/*
477 * Although this is just an alias for the above, need to move away from
478 * confusing users and using the 20 year old term 'cifs' when it is no
479 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
480 * SMB3 and later are highly secure.
481 */
482static const struct xattr_handler smb3_ntsd_xattr_handler = {
483 .name = SMB3_XATTR_CIFS_NTSD,
484 .flags = XATTR_CIFS_NTSD,
485 .get = cifs_xattr_get,
486 .set = cifs_xattr_set,
487};
488
489static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
490 .name = XATTR_NAME_POSIX_ACL_ACCESS,
491 .flags = XATTR_ACL_ACCESS,
492 .get = cifs_xattr_get,
493 .set = cifs_xattr_set,
494};
495
496static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
497 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
498 .flags = XATTR_ACL_DEFAULT,
499 .get = cifs_xattr_get,
500 .set = cifs_xattr_set,
501};
502
503const struct xattr_handler *cifs_xattr_handlers[] = {
504 &cifs_user_xattr_handler,
505 &cifs_os2_xattr_handler,
506 &cifs_cifs_acl_xattr_handler,
507 &smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
508 &cifs_cifs_ntsd_xattr_handler,
509 &smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
510 &cifs_posix_acl_access_xattr_handler,
511 &cifs_posix_acl_default_xattr_handler,
512 NULL
513};