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[mirror_ubuntu-bionic-kernel.git] / fs / cifs / xattr.c
CommitLineData
1da177e4
LT
1/*
2 * fs/cifs/xattr.c
3 *
79a58d1f 4 * Copyright (c) International Business Machines Corp., 2003, 2007
1da177e4
LT
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>
5a0e3ad6 24#include <linux/slab.h>
f995e740 25#include <linux/xattr.h>
1da177e4
LT
26#include "cifsfs.h"
27#include "cifspdu.h"
28#include "cifsglob.h"
29#include "cifsproto.h"
30#include "cifs_debug.h"
2baa2682
SF
31#include "cifs_fs_sb.h"
32#include "cifs_unicode.h"
1da177e4
LT
33
34#define MAX_EA_VALUE_SIZE 65535
fbeba8bb 35#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
a958fff2 36#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
66098044 37#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
f995e740 38/* BB need to add server (Samba e.g) support for security and trusted prefix */
1da177e4 39
a9ae008f 40enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
7ffec372 41
a9ae008f 42static int cifs_xattr_set(const struct xattr_handler *handler,
59301226
AV
43 struct dentry *dentry, struct inode *inode,
44 const char *name, const void *value,
45 size_t size, int flags)
1da177e4
LT
46{
47 int rc = -EOPNOTSUPP;
6d5786a3 48 unsigned int xid;
a9ae008f 49 struct super_block *sb = dentry->d_sb;
5fdccfef 50 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372 51 struct tcon_link *tlink;
96daf2b0 52 struct cifs_tcon *pTcon;
79a58d1f 53 char *full_path;
1da177e4 54
7ffec372
JL
55 tlink = cifs_sb_tlink(cifs_sb);
56 if (IS_ERR(tlink))
57 return PTR_ERR(tlink);
58 pTcon = tlink_tcon(tlink);
59
6d5786a3 60 xid = get_xid();
1da177e4 61
a9ae008f 62 full_path = build_path_from_dentry(dentry);
79a58d1f 63 if (full_path == NULL) {
0f3bc09e 64 rc = -ENOMEM;
a9ae008f 65 goto out;
1da177e4
LT
66 }
67 /* return dos attributes as pseudo xattr */
68 /* return alt name if available as pseudo attr */
69
70 /* if proc/fs/cifs/streamstoxattr is set then
79a58d1f 71 search server for EAs or streams to
1da177e4 72 returns as xattrs */
a9ae008f 73 if (size > MAX_EA_VALUE_SIZE) {
f96637be 74 cifs_dbg(FYI, "size of EA value too large\n");
7ffec372 75 rc = -EOPNOTSUPP;
a9ae008f 76 goto out;
1da177e4
LT
77 }
78
a9ae008f
AG
79 switch (handler->flags) {
80 case XATTR_USER:
79a58d1f 81 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f 82 goto out;
ad7a2926 83
666753c3
SF
84 if (pTcon->ses->server->ops->set_EA)
85 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
a9ae008f 86 full_path, name, value, (__u16)size,
2baa2682 87 cifs_sb->local_nls, cifs_remap(cifs_sb));
a9ae008f 88 break;
1da177e4 89
a9ae008f 90 case XATTR_CIFS_ACL: {
b0f8ef20
SN
91#ifdef CONFIG_CIFS_ACL
92 struct cifs_ntsd *pacl;
a9ae008f
AG
93
94 if (!value)
95 goto out;
96 pacl = kmalloc(size, GFP_KERNEL);
b73b9a4b 97 if (!pacl) {
b73b9a4b
SF
98 rc = -ENOMEM;
99 } else {
a9ae008f
AG
100 memcpy(pacl, value, size);
101 if (value &&
102 pTcon->ses->server->ops->set_acl)
83e3bc23 103 rc = pTcon->ses->server->ops->set_acl(pacl,
59301226 104 size, inode,
83e3bc23
SF
105 full_path, CIFS_ACL_DACL);
106 else
107 rc = -EOPNOTSUPP;
b73b9a4b 108 if (rc == 0) /* force revalidate of the inode */
59301226 109 CIFS_I(inode)->time = 0;
b73b9a4b 110 kfree(pacl);
b0f8ef20 111 }
b73b9a4b 112#endif /* CONFIG_CIFS_ACL */
a9ae008f
AG
113 break;
114 }
115
116 case XATTR_ACL_ACCESS:
1da177e4 117#ifdef CONFIG_CIFS_POSIX
a9ae008f
AG
118 if (!value)
119 goto out;
120 if (sb->s_flags & MS_POSIXACL)
121 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
122 value, (const int)size,
123 ACL_TYPE_ACCESS, cifs_sb->local_nls,
124 cifs_remap(cifs_sb));
125#endif /* CONFIG_CIFS_POSIX */
126 break;
127
128 case XATTR_ACL_DEFAULT:
1da177e4 129#ifdef CONFIG_CIFS_POSIX
a9ae008f
AG
130 if (!value)
131 goto out;
132 if (sb->s_flags & MS_POSIXACL)
133 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
134 value, (const int)size,
135 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
136 cifs_remap(cifs_sb));
137#endif /* CONFIG_CIFS_POSIX */
138 break;
1da177e4
LT
139 }
140
a9ae008f 141out:
f99d49ad 142 kfree(full_path);
6d5786a3 143 free_xid(xid);
7ffec372 144 cifs_put_tlink(tlink);
1da177e4
LT
145 return rc;
146}
147
a958fff2
SF
148static int cifs_attrib_get(struct dentry *dentry,
149 struct inode *inode, void *value,
150 size_t size)
151{
152 ssize_t rc;
153 __u32 *pattribute;
154
155 rc = cifs_revalidate_dentry_attr(dentry);
156
157 if (rc)
158 return rc;
159
160 if ((value == NULL) || (size == 0))
161 return sizeof(__u32);
162 else if (size < sizeof(__u32))
163 return -ERANGE;
164
165 /* return dos attributes as pseudo xattr */
166 pattribute = (__u32 *)value;
167 *pattribute = CIFS_I(inode)->cifsAttrs;
168
169 return sizeof(__u32);
170}
171
66098044
SF
172static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
173 void *value, size_t size)
174{
175 ssize_t rc;
176 __u64 * pcreatetime;
177
178 rc = cifs_revalidate_dentry_attr(dentry);
179 if (rc)
180 return rc;
181
182 if ((value == NULL) || (size == 0))
183 return sizeof(__u64);
184 else if (size < sizeof(__u64))
185 return -ERANGE;
186
187 /* return dos attributes as pseudo xattr */
188 pcreatetime = (__u64 *)value;
189 *pcreatetime = CIFS_I(inode)->createtime;
190 return sizeof(__u64);
191
192 return rc;
193}
194
a958fff2 195
a9ae008f
AG
196static int cifs_xattr_get(const struct xattr_handler *handler,
197 struct dentry *dentry, struct inode *inode,
198 const char *name, void *value, size_t size)
1da177e4
LT
199{
200 ssize_t rc = -EOPNOTSUPP;
6d5786a3 201 unsigned int xid;
a9ae008f 202 struct super_block *sb = dentry->d_sb;
5fdccfef 203 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372 204 struct tcon_link *tlink;
96daf2b0 205 struct cifs_tcon *pTcon;
79a58d1f 206 char *full_path;
1da177e4 207
7ffec372
JL
208 tlink = cifs_sb_tlink(cifs_sb);
209 if (IS_ERR(tlink))
210 return PTR_ERR(tlink);
211 pTcon = tlink_tcon(tlink);
212
6d5786a3 213 xid = get_xid();
1da177e4 214
a9ae008f 215 full_path = build_path_from_dentry(dentry);
79a58d1f 216 if (full_path == NULL) {
0f3bc09e 217 rc = -ENOMEM;
a9ae008f 218 goto out;
1da177e4 219 }
a958fff2 220
1da177e4 221 /* return alt name if available as pseudo attr */
a9ae008f
AG
222 switch (handler->flags) {
223 case XATTR_USER:
a958fff2
SF
224 cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
225 if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
226 rc = cifs_attrib_get(dentry, inode, value, size);
227 break;
66098044
SF
228 } else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
229 rc = cifs_creation_time_get(dentry, inode, value, size);
230 break;
a958fff2
SF
231 }
232
79a58d1f 233 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f 234 goto out;
1da177e4 235
666753c3
SF
236 if (pTcon->ses->server->ops->query_all_EAs)
237 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
a9ae008f 238 full_path, name, value, size,
2baa2682 239 cifs_sb->local_nls, cifs_remap(cifs_sb));
a9ae008f 240 break;
1da177e4 241
a9ae008f
AG
242 case XATTR_CIFS_ACL: {
243#ifdef CONFIG_CIFS_ACL
244 u32 acllen;
245 struct cifs_ntsd *pacl;
246
247 if (pTcon->ses->server->ops->get_acl == NULL)
248 goto out; /* rc already EOPNOTSUPP */
249
250 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
251 inode, full_path, &acllen);
252 if (IS_ERR(pacl)) {
253 rc = PTR_ERR(pacl);
254 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
255 __func__, rc);
256 } else {
257 if (value) {
258 if (acllen > size)
259 acllen = -ERANGE;
260 else
261 memcpy(value, pacl, acllen);
262 }
263 rc = acllen;
264 kfree(pacl);
265 }
266#endif /* CONFIG_CIFS_ACL */
267 break;
268 }
269
270 case XATTR_ACL_ACCESS:
1da177e4 271#ifdef CONFIG_CIFS_POSIX
79a58d1f 272 if (sb->s_flags & MS_POSIXACL)
1da0c78b 273 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f 274 value, size, ACL_TYPE_ACCESS,
737b758c 275 cifs_sb->local_nls,
2baa2682 276 cifs_remap(cifs_sb));
a9ae008f
AG
277#endif /* CONFIG_CIFS_POSIX */
278 break;
279
280 case XATTR_ACL_DEFAULT:
1da177e4 281#ifdef CONFIG_CIFS_POSIX
79a58d1f 282 if (sb->s_flags & MS_POSIXACL)
1da0c78b 283 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f 284 value, size, ACL_TYPE_DEFAULT,
737b758c 285 cifs_sb->local_nls,
2baa2682 286 cifs_remap(cifs_sb));
a9ae008f
AG
287#endif /* CONFIG_CIFS_POSIX */
288 break;
289 }
1da177e4 290
79a58d1f 291 /* We could add an additional check for streams ie
1da177e4 292 if proc/fs/cifs/streamstoxattr is set then
79a58d1f 293 search server for EAs or streams to
1da177e4
LT
294 returns as xattrs */
295
79a58d1f
SF
296 if (rc == -EINVAL)
297 rc = -EOPNOTSUPP;
1da177e4 298
a9ae008f 299out:
f99d49ad 300 kfree(full_path);
6d5786a3 301 free_xid(xid);
7ffec372 302 cifs_put_tlink(tlink);
1da177e4
LT
303 return rc;
304}
305
79a58d1f 306ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
1da177e4
LT
307{
308 ssize_t rc = -EOPNOTSUPP;
6d5786a3 309 unsigned int xid;
5fdccfef 310 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
7ffec372 311 struct tcon_link *tlink;
96daf2b0 312 struct cifs_tcon *pTcon;
79a58d1f 313 char *full_path;
1da177e4 314
79a58d1f 315 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
ea4c07d7
SF
316 return -EOPNOTSUPP;
317
7ffec372
JL
318 tlink = cifs_sb_tlink(cifs_sb);
319 if (IS_ERR(tlink))
320 return PTR_ERR(tlink);
321 pTcon = tlink_tcon(tlink);
322
6d5786a3 323 xid = get_xid();
ea4c07d7 324
1da177e4 325 full_path = build_path_from_dentry(direntry);
79a58d1f 326 if (full_path == NULL) {
0f3bc09e 327 rc = -ENOMEM;
7ffec372 328 goto list_ea_exit;
1da177e4
LT
329 }
330 /* return dos attributes as pseudo xattr */
331 /* return alt name if available as pseudo attr */
332
333 /* if proc/fs/cifs/streamstoxattr is set then
79a58d1f 334 search server for EAs or streams to
1da177e4 335 returns as xattrs */
1da177e4 336
666753c3
SF
337 if (pTcon->ses->server->ops->query_all_EAs)
338 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
339 full_path, NULL, data, buf_size,
2baa2682 340 cifs_sb->local_nls, cifs_remap(cifs_sb));
7ffec372 341list_ea_exit:
f99d49ad 342 kfree(full_path);
6d5786a3 343 free_xid(xid);
7ffec372 344 cifs_put_tlink(tlink);
1da177e4
LT
345 return rc;
346}
a9ae008f
AG
347
348static const struct xattr_handler cifs_user_xattr_handler = {
349 .prefix = XATTR_USER_PREFIX,
350 .flags = XATTR_USER,
351 .get = cifs_xattr_get,
352 .set = cifs_xattr_set,
353};
354
355/* os2.* attributes are treated like user.* attributes */
356static const struct xattr_handler cifs_os2_xattr_handler = {
357 .prefix = XATTR_OS2_PREFIX,
358 .flags = XATTR_USER,
359 .get = cifs_xattr_get,
360 .set = cifs_xattr_set,
361};
362
363static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
364 .name = CIFS_XATTR_CIFS_ACL,
365 .flags = XATTR_CIFS_ACL,
366 .get = cifs_xattr_get,
367 .set = cifs_xattr_set,
368};
369
370static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
371 .name = XATTR_NAME_POSIX_ACL_ACCESS,
372 .flags = XATTR_ACL_ACCESS,
373 .get = cifs_xattr_get,
374 .set = cifs_xattr_set,
375};
376
377static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
378 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
379 .flags = XATTR_ACL_DEFAULT,
380 .get = cifs_xattr_get,
381 .set = cifs_xattr_set,
382};
383
384const struct xattr_handler *cifs_xattr_handlers[] = {
385 &cifs_user_xattr_handler,
386 &cifs_os2_xattr_handler,
387 &cifs_cifs_acl_xattr_handler,
388 &cifs_posix_acl_access_xattr_handler,
389 &cifs_posix_acl_default_xattr_handler,
390 NULL
391};