Commit | Line | Data |
---|---|---|
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 */ |
c4f7173a SF |
38 | /* |
39 | * Although these three are just aliases for the above, need to move away from | |
40 | * confusing users and using the 20+ year old term 'cifs' when it is no longer | |
41 | * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago | |
42 | */ | |
43 | #define SMB3_XATTR_CIFS_ACL "system.smb3_acl" | |
44 | #define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */ | |
45 | #define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */ | |
f995e740 | 46 | /* BB need to add server (Samba e.g) support for security and trusted prefix */ |
1da177e4 | 47 | |
a9ae008f | 48 | enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT }; |
7ffec372 | 49 | |
a9ae008f | 50 | static int cifs_xattr_set(const struct xattr_handler *handler, |
59301226 AV |
51 | struct dentry *dentry, struct inode *inode, |
52 | const char *name, const void *value, | |
53 | size_t size, int flags) | |
1da177e4 LT |
54 | { |
55 | int rc = -EOPNOTSUPP; | |
6d5786a3 | 56 | unsigned int xid; |
a9ae008f | 57 | struct super_block *sb = dentry->d_sb; |
5fdccfef | 58 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
7ffec372 | 59 | struct tcon_link *tlink; |
96daf2b0 | 60 | struct cifs_tcon *pTcon; |
79a58d1f | 61 | char *full_path; |
1da177e4 | 62 | |
7ffec372 JL |
63 | tlink = cifs_sb_tlink(cifs_sb); |
64 | if (IS_ERR(tlink)) | |
65 | return PTR_ERR(tlink); | |
66 | pTcon = tlink_tcon(tlink); | |
67 | ||
6d5786a3 | 68 | xid = get_xid(); |
1da177e4 | 69 | |
a9ae008f | 70 | full_path = build_path_from_dentry(dentry); |
79a58d1f | 71 | if (full_path == NULL) { |
0f3bc09e | 72 | rc = -ENOMEM; |
a9ae008f | 73 | goto out; |
1da177e4 LT |
74 | } |
75 | /* return dos attributes as pseudo xattr */ | |
76 | /* return alt name if available as pseudo attr */ | |
77 | ||
78 | /* if proc/fs/cifs/streamstoxattr is set then | |
79a58d1f | 79 | search server for EAs or streams to |
1da177e4 | 80 | returns as xattrs */ |
a9ae008f | 81 | if (size > MAX_EA_VALUE_SIZE) { |
f96637be | 82 | cifs_dbg(FYI, "size of EA value too large\n"); |
7ffec372 | 83 | rc = -EOPNOTSUPP; |
a9ae008f | 84 | goto out; |
1da177e4 LT |
85 | } |
86 | ||
a9ae008f AG |
87 | switch (handler->flags) { |
88 | case XATTR_USER: | |
79a58d1f | 89 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
a9ae008f | 90 | goto out; |
ad7a2926 | 91 | |
666753c3 SF |
92 | if (pTcon->ses->server->ops->set_EA) |
93 | rc = pTcon->ses->server->ops->set_EA(xid, pTcon, | |
a9ae008f | 94 | full_path, name, value, (__u16)size, |
5517554e | 95 | cifs_sb->local_nls, cifs_sb); |
a9ae008f | 96 | break; |
1da177e4 | 97 | |
a9ae008f | 98 | case XATTR_CIFS_ACL: { |
b0f8ef20 | 99 | struct cifs_ntsd *pacl; |
a9ae008f AG |
100 | |
101 | if (!value) | |
102 | goto out; | |
103 | pacl = kmalloc(size, GFP_KERNEL); | |
b73b9a4b | 104 | if (!pacl) { |
b73b9a4b SF |
105 | rc = -ENOMEM; |
106 | } else { | |
a9ae008f AG |
107 | memcpy(pacl, value, size); |
108 | if (value && | |
109 | pTcon->ses->server->ops->set_acl) | |
83e3bc23 | 110 | rc = pTcon->ses->server->ops->set_acl(pacl, |
59301226 | 111 | size, inode, |
83e3bc23 SF |
112 | full_path, CIFS_ACL_DACL); |
113 | else | |
114 | rc = -EOPNOTSUPP; | |
b73b9a4b | 115 | if (rc == 0) /* force revalidate of the inode */ |
59301226 | 116 | CIFS_I(inode)->time = 0; |
b73b9a4b | 117 | kfree(pacl); |
b0f8ef20 | 118 | } |
a9ae008f AG |
119 | break; |
120 | } | |
121 | ||
122 | case XATTR_ACL_ACCESS: | |
1da177e4 | 123 | #ifdef CONFIG_CIFS_POSIX |
a9ae008f AG |
124 | if (!value) |
125 | goto out; | |
1751e8a6 | 126 | if (sb->s_flags & SB_POSIXACL) |
a9ae008f AG |
127 | rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, |
128 | value, (const int)size, | |
129 | ACL_TYPE_ACCESS, cifs_sb->local_nls, | |
130 | cifs_remap(cifs_sb)); | |
131 | #endif /* CONFIG_CIFS_POSIX */ | |
132 | break; | |
133 | ||
134 | case XATTR_ACL_DEFAULT: | |
1da177e4 | 135 | #ifdef CONFIG_CIFS_POSIX |
a9ae008f AG |
136 | if (!value) |
137 | goto out; | |
1751e8a6 | 138 | if (sb->s_flags & SB_POSIXACL) |
a9ae008f AG |
139 | rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, |
140 | value, (const int)size, | |
141 | ACL_TYPE_DEFAULT, cifs_sb->local_nls, | |
142 | cifs_remap(cifs_sb)); | |
143 | #endif /* CONFIG_CIFS_POSIX */ | |
144 | break; | |
1da177e4 LT |
145 | } |
146 | ||
a9ae008f | 147 | out: |
f99d49ad | 148 | kfree(full_path); |
6d5786a3 | 149 | free_xid(xid); |
7ffec372 | 150 | cifs_put_tlink(tlink); |
1da177e4 LT |
151 | return rc; |
152 | } | |
153 | ||
a958fff2 SF |
154 | static int cifs_attrib_get(struct dentry *dentry, |
155 | struct inode *inode, void *value, | |
156 | size_t size) | |
157 | { | |
158 | ssize_t rc; | |
159 | __u32 *pattribute; | |
160 | ||
161 | rc = cifs_revalidate_dentry_attr(dentry); | |
162 | ||
163 | if (rc) | |
164 | return rc; | |
165 | ||
166 | if ((value == NULL) || (size == 0)) | |
167 | return sizeof(__u32); | |
168 | else if (size < sizeof(__u32)) | |
169 | return -ERANGE; | |
170 | ||
171 | /* return dos attributes as pseudo xattr */ | |
172 | pattribute = (__u32 *)value; | |
173 | *pattribute = CIFS_I(inode)->cifsAttrs; | |
174 | ||
175 | return sizeof(__u32); | |
176 | } | |
177 | ||
66098044 SF |
178 | static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode, |
179 | void *value, size_t size) | |
180 | { | |
181 | ssize_t rc; | |
182 | __u64 * pcreatetime; | |
183 | ||
184 | rc = cifs_revalidate_dentry_attr(dentry); | |
185 | if (rc) | |
186 | return rc; | |
187 | ||
188 | if ((value == NULL) || (size == 0)) | |
189 | return sizeof(__u64); | |
190 | else if (size < sizeof(__u64)) | |
191 | return -ERANGE; | |
192 | ||
193 | /* return dos attributes as pseudo xattr */ | |
194 | pcreatetime = (__u64 *)value; | |
195 | *pcreatetime = CIFS_I(inode)->createtime; | |
196 | return sizeof(__u64); | |
66098044 SF |
197 | } |
198 | ||
a958fff2 | 199 | |
a9ae008f AG |
200 | static int cifs_xattr_get(const struct xattr_handler *handler, |
201 | struct dentry *dentry, struct inode *inode, | |
202 | const char *name, void *value, size_t size) | |
1da177e4 LT |
203 | { |
204 | ssize_t rc = -EOPNOTSUPP; | |
6d5786a3 | 205 | unsigned int xid; |
a9ae008f | 206 | struct super_block *sb = dentry->d_sb; |
5fdccfef | 207 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
7ffec372 | 208 | struct tcon_link *tlink; |
96daf2b0 | 209 | struct cifs_tcon *pTcon; |
79a58d1f | 210 | char *full_path; |
1da177e4 | 211 | |
7ffec372 JL |
212 | tlink = cifs_sb_tlink(cifs_sb); |
213 | if (IS_ERR(tlink)) | |
214 | return PTR_ERR(tlink); | |
215 | pTcon = tlink_tcon(tlink); | |
216 | ||
6d5786a3 | 217 | xid = get_xid(); |
1da177e4 | 218 | |
a9ae008f | 219 | full_path = build_path_from_dentry(dentry); |
79a58d1f | 220 | if (full_path == NULL) { |
0f3bc09e | 221 | rc = -ENOMEM; |
a9ae008f | 222 | goto out; |
1da177e4 | 223 | } |
a958fff2 | 224 | |
1da177e4 | 225 | /* return alt name if available as pseudo attr */ |
a9ae008f AG |
226 | switch (handler->flags) { |
227 | case XATTR_USER: | |
a958fff2 | 228 | cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name); |
c4f7173a SF |
229 | if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) || |
230 | (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) { | |
a958fff2 SF |
231 | rc = cifs_attrib_get(dentry, inode, value, size); |
232 | break; | |
c4f7173a SF |
233 | } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) || |
234 | (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) { | |
66098044 SF |
235 | rc = cifs_creation_time_get(dentry, inode, value, size); |
236 | break; | |
a958fff2 SF |
237 | } |
238 | ||
79a58d1f | 239 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
a9ae008f | 240 | goto out; |
1da177e4 | 241 | |
666753c3 SF |
242 | if (pTcon->ses->server->ops->query_all_EAs) |
243 | rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon, | |
67b4c889 | 244 | full_path, name, value, size, cifs_sb); |
a9ae008f | 245 | break; |
1da177e4 | 246 | |
a9ae008f | 247 | case XATTR_CIFS_ACL: { |
a9ae008f AG |
248 | u32 acllen; |
249 | struct cifs_ntsd *pacl; | |
250 | ||
251 | if (pTcon->ses->server->ops->get_acl == NULL) | |
252 | goto out; /* rc already EOPNOTSUPP */ | |
253 | ||
254 | pacl = pTcon->ses->server->ops->get_acl(cifs_sb, | |
255 | inode, full_path, &acllen); | |
256 | if (IS_ERR(pacl)) { | |
257 | rc = PTR_ERR(pacl); | |
258 | cifs_dbg(VFS, "%s: error %zd getting sec desc\n", | |
259 | __func__, rc); | |
260 | } else { | |
261 | if (value) { | |
262 | if (acllen > size) | |
263 | acllen = -ERANGE; | |
264 | else | |
265 | memcpy(value, pacl, acllen); | |
266 | } | |
267 | rc = acllen; | |
268 | kfree(pacl); | |
269 | } | |
a9ae008f AG |
270 | break; |
271 | } | |
272 | ||
273 | case XATTR_ACL_ACCESS: | |
1da177e4 | 274 | #ifdef CONFIG_CIFS_POSIX |
1751e8a6 | 275 | if (sb->s_flags & SB_POSIXACL) |
1da0c78b | 276 | rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, |
a9ae008f | 277 | value, size, ACL_TYPE_ACCESS, |
737b758c | 278 | cifs_sb->local_nls, |
2baa2682 | 279 | cifs_remap(cifs_sb)); |
a9ae008f AG |
280 | #endif /* CONFIG_CIFS_POSIX */ |
281 | break; | |
282 | ||
283 | case XATTR_ACL_DEFAULT: | |
1da177e4 | 284 | #ifdef CONFIG_CIFS_POSIX |
1751e8a6 | 285 | if (sb->s_flags & SB_POSIXACL) |
1da0c78b | 286 | rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, |
a9ae008f | 287 | value, size, ACL_TYPE_DEFAULT, |
737b758c | 288 | cifs_sb->local_nls, |
2baa2682 | 289 | cifs_remap(cifs_sb)); |
a9ae008f AG |
290 | #endif /* CONFIG_CIFS_POSIX */ |
291 | break; | |
292 | } | |
1da177e4 | 293 | |
79a58d1f | 294 | /* We could add an additional check for streams ie |
1da177e4 | 295 | if proc/fs/cifs/streamstoxattr is set then |
79a58d1f | 296 | search server for EAs or streams to |
1da177e4 LT |
297 | returns as xattrs */ |
298 | ||
79a58d1f SF |
299 | if (rc == -EINVAL) |
300 | rc = -EOPNOTSUPP; | |
1da177e4 | 301 | |
a9ae008f | 302 | out: |
f99d49ad | 303 | kfree(full_path); |
6d5786a3 | 304 | free_xid(xid); |
7ffec372 | 305 | cifs_put_tlink(tlink); |
1da177e4 LT |
306 | return rc; |
307 | } | |
308 | ||
79a58d1f | 309 | ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size) |
1da177e4 LT |
310 | { |
311 | ssize_t rc = -EOPNOTSUPP; | |
6d5786a3 | 312 | unsigned int xid; |
5fdccfef | 313 | struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
7ffec372 | 314 | struct tcon_link *tlink; |
96daf2b0 | 315 | struct cifs_tcon *pTcon; |
79a58d1f | 316 | char *full_path; |
1da177e4 | 317 | |
79a58d1f | 318 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
ea4c07d7 SF |
319 | return -EOPNOTSUPP; |
320 | ||
7ffec372 JL |
321 | tlink = cifs_sb_tlink(cifs_sb); |
322 | if (IS_ERR(tlink)) | |
323 | return PTR_ERR(tlink); | |
324 | pTcon = tlink_tcon(tlink); | |
325 | ||
6d5786a3 | 326 | xid = get_xid(); |
ea4c07d7 | 327 | |
1da177e4 | 328 | full_path = build_path_from_dentry(direntry); |
79a58d1f | 329 | if (full_path == NULL) { |
0f3bc09e | 330 | rc = -ENOMEM; |
7ffec372 | 331 | goto list_ea_exit; |
1da177e4 LT |
332 | } |
333 | /* return dos attributes as pseudo xattr */ | |
334 | /* return alt name if available as pseudo attr */ | |
335 | ||
336 | /* if proc/fs/cifs/streamstoxattr is set then | |
79a58d1f | 337 | search server for EAs or streams to |
1da177e4 | 338 | returns as xattrs */ |
1da177e4 | 339 | |
666753c3 SF |
340 | if (pTcon->ses->server->ops->query_all_EAs) |
341 | rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon, | |
67b4c889 | 342 | full_path, NULL, data, buf_size, cifs_sb); |
7ffec372 | 343 | list_ea_exit: |
f99d49ad | 344 | kfree(full_path); |
6d5786a3 | 345 | free_xid(xid); |
7ffec372 | 346 | cifs_put_tlink(tlink); |
1da177e4 LT |
347 | return rc; |
348 | } | |
a9ae008f AG |
349 | |
350 | static const struct xattr_handler cifs_user_xattr_handler = { | |
351 | .prefix = XATTR_USER_PREFIX, | |
352 | .flags = XATTR_USER, | |
353 | .get = cifs_xattr_get, | |
354 | .set = cifs_xattr_set, | |
355 | }; | |
356 | ||
357 | /* os2.* attributes are treated like user.* attributes */ | |
358 | static const struct xattr_handler cifs_os2_xattr_handler = { | |
359 | .prefix = XATTR_OS2_PREFIX, | |
360 | .flags = XATTR_USER, | |
361 | .get = cifs_xattr_get, | |
362 | .set = cifs_xattr_set, | |
363 | }; | |
364 | ||
365 | static const struct xattr_handler cifs_cifs_acl_xattr_handler = { | |
366 | .name = CIFS_XATTR_CIFS_ACL, | |
367 | .flags = XATTR_CIFS_ACL, | |
368 | .get = cifs_xattr_get, | |
369 | .set = cifs_xattr_set, | |
370 | }; | |
371 | ||
c4f7173a SF |
372 | /* |
373 | * Although this is just an alias for the above, need to move away from | |
374 | * confusing users and using the 20 year old term 'cifs' when it is no | |
375 | * longer secure and was replaced by SMB2/SMB3 a long time ago, and | |
376 | * SMB3 and later are highly secure. | |
377 | */ | |
378 | static const struct xattr_handler smb3_acl_xattr_handler = { | |
379 | .name = SMB3_XATTR_CIFS_ACL, | |
380 | .flags = XATTR_CIFS_ACL, | |
381 | .get = cifs_xattr_get, | |
382 | .set = cifs_xattr_set, | |
383 | }; | |
384 | ||
a9ae008f AG |
385 | static const struct xattr_handler cifs_posix_acl_access_xattr_handler = { |
386 | .name = XATTR_NAME_POSIX_ACL_ACCESS, | |
387 | .flags = XATTR_ACL_ACCESS, | |
388 | .get = cifs_xattr_get, | |
389 | .set = cifs_xattr_set, | |
390 | }; | |
391 | ||
392 | static const struct xattr_handler cifs_posix_acl_default_xattr_handler = { | |
393 | .name = XATTR_NAME_POSIX_ACL_DEFAULT, | |
394 | .flags = XATTR_ACL_DEFAULT, | |
395 | .get = cifs_xattr_get, | |
396 | .set = cifs_xattr_set, | |
397 | }; | |
398 | ||
399 | const struct xattr_handler *cifs_xattr_handlers[] = { | |
400 | &cifs_user_xattr_handler, | |
401 | &cifs_os2_xattr_handler, | |
402 | &cifs_cifs_acl_xattr_handler, | |
c4f7173a | 403 | &smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */ |
a9ae008f AG |
404 | &cifs_posix_acl_access_xattr_handler, |
405 | &cifs_posix_acl_default_xattr_handler, | |
406 | NULL | |
407 | }; |