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Commit | Line | Data |
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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 SN |
99 | #ifdef CONFIG_CIFS_ACL |
100 | struct cifs_ntsd *pacl; | |
a9ae008f AG |
101 | |
102 | if (!value) | |
103 | goto out; | |
104 | pacl = kmalloc(size, GFP_KERNEL); | |
b73b9a4b | 105 | if (!pacl) { |
b73b9a4b SF |
106 | rc = -ENOMEM; |
107 | } else { | |
a9ae008f AG |
108 | memcpy(pacl, value, size); |
109 | if (value && | |
110 | pTcon->ses->server->ops->set_acl) | |
83e3bc23 | 111 | rc = pTcon->ses->server->ops->set_acl(pacl, |
59301226 | 112 | size, inode, |
83e3bc23 SF |
113 | full_path, CIFS_ACL_DACL); |
114 | else | |
115 | rc = -EOPNOTSUPP; | |
b73b9a4b | 116 | if (rc == 0) /* force revalidate of the inode */ |
59301226 | 117 | CIFS_I(inode)->time = 0; |
b73b9a4b | 118 | kfree(pacl); |
b0f8ef20 | 119 | } |
b73b9a4b | 120 | #endif /* CONFIG_CIFS_ACL */ |
a9ae008f AG |
121 | break; |
122 | } | |
123 | ||
124 | case XATTR_ACL_ACCESS: | |
1da177e4 | 125 | #ifdef CONFIG_CIFS_POSIX |
a9ae008f AG |
126 | if (!value) |
127 | goto out; | |
1751e8a6 | 128 | if (sb->s_flags & SB_POSIXACL) |
a9ae008f AG |
129 | rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, |
130 | value, (const int)size, | |
131 | ACL_TYPE_ACCESS, cifs_sb->local_nls, | |
132 | cifs_remap(cifs_sb)); | |
133 | #endif /* CONFIG_CIFS_POSIX */ | |
134 | break; | |
135 | ||
136 | case XATTR_ACL_DEFAULT: | |
1da177e4 | 137 | #ifdef CONFIG_CIFS_POSIX |
a9ae008f AG |
138 | if (!value) |
139 | goto out; | |
1751e8a6 | 140 | if (sb->s_flags & SB_POSIXACL) |
a9ae008f AG |
141 | rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, |
142 | value, (const int)size, | |
143 | ACL_TYPE_DEFAULT, cifs_sb->local_nls, | |
144 | cifs_remap(cifs_sb)); | |
145 | #endif /* CONFIG_CIFS_POSIX */ | |
146 | break; | |
1da177e4 LT |
147 | } |
148 | ||
a9ae008f | 149 | out: |
f99d49ad | 150 | kfree(full_path); |
6d5786a3 | 151 | free_xid(xid); |
7ffec372 | 152 | cifs_put_tlink(tlink); |
1da177e4 LT |
153 | return rc; |
154 | } | |
155 | ||
a958fff2 SF |
156 | static int cifs_attrib_get(struct dentry *dentry, |
157 | struct inode *inode, void *value, | |
158 | size_t size) | |
159 | { | |
160 | ssize_t rc; | |
161 | __u32 *pattribute; | |
162 | ||
163 | rc = cifs_revalidate_dentry_attr(dentry); | |
164 | ||
165 | if (rc) | |
166 | return rc; | |
167 | ||
168 | if ((value == NULL) || (size == 0)) | |
169 | return sizeof(__u32); | |
170 | else if (size < sizeof(__u32)) | |
171 | return -ERANGE; | |
172 | ||
173 | /* return dos attributes as pseudo xattr */ | |
174 | pattribute = (__u32 *)value; | |
175 | *pattribute = CIFS_I(inode)->cifsAttrs; | |
176 | ||
177 | return sizeof(__u32); | |
178 | } | |
179 | ||
66098044 SF |
180 | static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode, |
181 | void *value, size_t size) | |
182 | { | |
183 | ssize_t rc; | |
184 | __u64 * pcreatetime; | |
185 | ||
186 | rc = cifs_revalidate_dentry_attr(dentry); | |
187 | if (rc) | |
188 | return rc; | |
189 | ||
190 | if ((value == NULL) || (size == 0)) | |
191 | return sizeof(__u64); | |
192 | else if (size < sizeof(__u64)) | |
193 | return -ERANGE; | |
194 | ||
195 | /* return dos attributes as pseudo xattr */ | |
196 | pcreatetime = (__u64 *)value; | |
197 | *pcreatetime = CIFS_I(inode)->createtime; | |
198 | return sizeof(__u64); | |
66098044 SF |
199 | } |
200 | ||
a958fff2 | 201 | |
a9ae008f AG |
202 | static int cifs_xattr_get(const struct xattr_handler *handler, |
203 | struct dentry *dentry, struct inode *inode, | |
204 | const char *name, void *value, size_t size) | |
1da177e4 LT |
205 | { |
206 | ssize_t rc = -EOPNOTSUPP; | |
6d5786a3 | 207 | unsigned int xid; |
a9ae008f | 208 | struct super_block *sb = dentry->d_sb; |
5fdccfef | 209 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
7ffec372 | 210 | struct tcon_link *tlink; |
96daf2b0 | 211 | struct cifs_tcon *pTcon; |
79a58d1f | 212 | char *full_path; |
1da177e4 | 213 | |
7ffec372 JL |
214 | tlink = cifs_sb_tlink(cifs_sb); |
215 | if (IS_ERR(tlink)) | |
216 | return PTR_ERR(tlink); | |
217 | pTcon = tlink_tcon(tlink); | |
218 | ||
6d5786a3 | 219 | xid = get_xid(); |
1da177e4 | 220 | |
a9ae008f | 221 | full_path = build_path_from_dentry(dentry); |
79a58d1f | 222 | if (full_path == NULL) { |
0f3bc09e | 223 | rc = -ENOMEM; |
a9ae008f | 224 | goto out; |
1da177e4 | 225 | } |
a958fff2 | 226 | |
1da177e4 | 227 | /* return alt name if available as pseudo attr */ |
a9ae008f AG |
228 | switch (handler->flags) { |
229 | case XATTR_USER: | |
a958fff2 | 230 | cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name); |
c4f7173a SF |
231 | if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) || |
232 | (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) { | |
a958fff2 SF |
233 | rc = cifs_attrib_get(dentry, inode, value, size); |
234 | break; | |
c4f7173a SF |
235 | } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) || |
236 | (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) { | |
66098044 SF |
237 | rc = cifs_creation_time_get(dentry, inode, value, size); |
238 | break; | |
a958fff2 SF |
239 | } |
240 | ||
79a58d1f | 241 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
a9ae008f | 242 | goto out; |
1da177e4 | 243 | |
666753c3 SF |
244 | if (pTcon->ses->server->ops->query_all_EAs) |
245 | rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon, | |
67b4c889 | 246 | full_path, name, value, size, cifs_sb); |
a9ae008f | 247 | break; |
1da177e4 | 248 | |
a9ae008f AG |
249 | case XATTR_CIFS_ACL: { |
250 | #ifdef CONFIG_CIFS_ACL | |
251 | u32 acllen; | |
252 | struct cifs_ntsd *pacl; | |
253 | ||
254 | if (pTcon->ses->server->ops->get_acl == NULL) | |
255 | goto out; /* rc already EOPNOTSUPP */ | |
256 | ||
257 | pacl = pTcon->ses->server->ops->get_acl(cifs_sb, | |
258 | inode, full_path, &acllen); | |
259 | if (IS_ERR(pacl)) { | |
260 | rc = PTR_ERR(pacl); | |
261 | cifs_dbg(VFS, "%s: error %zd getting sec desc\n", | |
262 | __func__, rc); | |
263 | } else { | |
264 | if (value) { | |
265 | if (acllen > size) | |
266 | acllen = -ERANGE; | |
267 | else | |
268 | memcpy(value, pacl, acllen); | |
269 | } | |
270 | rc = acllen; | |
271 | kfree(pacl); | |
272 | } | |
273 | #endif /* CONFIG_CIFS_ACL */ | |
274 | break; | |
275 | } | |
276 | ||
277 | case XATTR_ACL_ACCESS: | |
1da177e4 | 278 | #ifdef CONFIG_CIFS_POSIX |
1751e8a6 | 279 | if (sb->s_flags & SB_POSIXACL) |
1da0c78b | 280 | rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, |
a9ae008f | 281 | value, size, ACL_TYPE_ACCESS, |
737b758c | 282 | cifs_sb->local_nls, |
2baa2682 | 283 | cifs_remap(cifs_sb)); |
a9ae008f AG |
284 | #endif /* CONFIG_CIFS_POSIX */ |
285 | break; | |
286 | ||
287 | case XATTR_ACL_DEFAULT: | |
1da177e4 | 288 | #ifdef CONFIG_CIFS_POSIX |
1751e8a6 | 289 | if (sb->s_flags & SB_POSIXACL) |
1da0c78b | 290 | rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, |
a9ae008f | 291 | value, size, ACL_TYPE_DEFAULT, |
737b758c | 292 | cifs_sb->local_nls, |
2baa2682 | 293 | cifs_remap(cifs_sb)); |
a9ae008f AG |
294 | #endif /* CONFIG_CIFS_POSIX */ |
295 | break; | |
296 | } | |
1da177e4 | 297 | |
79a58d1f | 298 | /* We could add an additional check for streams ie |
1da177e4 | 299 | if proc/fs/cifs/streamstoxattr is set then |
79a58d1f | 300 | search server for EAs or streams to |
1da177e4 LT |
301 | returns as xattrs */ |
302 | ||
79a58d1f SF |
303 | if (rc == -EINVAL) |
304 | rc = -EOPNOTSUPP; | |
1da177e4 | 305 | |
a9ae008f | 306 | out: |
f99d49ad | 307 | kfree(full_path); |
6d5786a3 | 308 | free_xid(xid); |
7ffec372 | 309 | cifs_put_tlink(tlink); |
1da177e4 LT |
310 | return rc; |
311 | } | |
312 | ||
79a58d1f | 313 | ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size) |
1da177e4 LT |
314 | { |
315 | ssize_t rc = -EOPNOTSUPP; | |
6d5786a3 | 316 | unsigned int xid; |
5fdccfef | 317 | struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
7ffec372 | 318 | struct tcon_link *tlink; |
96daf2b0 | 319 | struct cifs_tcon *pTcon; |
79a58d1f | 320 | char *full_path; |
1da177e4 | 321 | |
79a58d1f | 322 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
ea4c07d7 SF |
323 | return -EOPNOTSUPP; |
324 | ||
7ffec372 JL |
325 | tlink = cifs_sb_tlink(cifs_sb); |
326 | if (IS_ERR(tlink)) | |
327 | return PTR_ERR(tlink); | |
328 | pTcon = tlink_tcon(tlink); | |
329 | ||
6d5786a3 | 330 | xid = get_xid(); |
ea4c07d7 | 331 | |
1da177e4 | 332 | full_path = build_path_from_dentry(direntry); |
79a58d1f | 333 | if (full_path == NULL) { |
0f3bc09e | 334 | rc = -ENOMEM; |
7ffec372 | 335 | goto list_ea_exit; |
1da177e4 LT |
336 | } |
337 | /* return dos attributes as pseudo xattr */ | |
338 | /* return alt name if available as pseudo attr */ | |
339 | ||
340 | /* if proc/fs/cifs/streamstoxattr is set then | |
79a58d1f | 341 | search server for EAs or streams to |
1da177e4 | 342 | returns as xattrs */ |
1da177e4 | 343 | |
666753c3 SF |
344 | if (pTcon->ses->server->ops->query_all_EAs) |
345 | rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon, | |
67b4c889 | 346 | full_path, NULL, data, buf_size, cifs_sb); |
7ffec372 | 347 | list_ea_exit: |
f99d49ad | 348 | kfree(full_path); |
6d5786a3 | 349 | free_xid(xid); |
7ffec372 | 350 | cifs_put_tlink(tlink); |
1da177e4 LT |
351 | return rc; |
352 | } | |
a9ae008f AG |
353 | |
354 | static const struct xattr_handler cifs_user_xattr_handler = { | |
355 | .prefix = XATTR_USER_PREFIX, | |
356 | .flags = XATTR_USER, | |
357 | .get = cifs_xattr_get, | |
358 | .set = cifs_xattr_set, | |
359 | }; | |
360 | ||
361 | /* os2.* attributes are treated like user.* attributes */ | |
362 | static const struct xattr_handler cifs_os2_xattr_handler = { | |
363 | .prefix = XATTR_OS2_PREFIX, | |
364 | .flags = XATTR_USER, | |
365 | .get = cifs_xattr_get, | |
366 | .set = cifs_xattr_set, | |
367 | }; | |
368 | ||
369 | static const struct xattr_handler cifs_cifs_acl_xattr_handler = { | |
370 | .name = CIFS_XATTR_CIFS_ACL, | |
371 | .flags = XATTR_CIFS_ACL, | |
372 | .get = cifs_xattr_get, | |
373 | .set = cifs_xattr_set, | |
374 | }; | |
375 | ||
c4f7173a SF |
376 | /* |
377 | * Although this is just an alias for the above, need to move away from | |
378 | * confusing users and using the 20 year old term 'cifs' when it is no | |
379 | * longer secure and was replaced by SMB2/SMB3 a long time ago, and | |
380 | * SMB3 and later are highly secure. | |
381 | */ | |
382 | static const struct xattr_handler smb3_acl_xattr_handler = { | |
383 | .name = SMB3_XATTR_CIFS_ACL, | |
384 | .flags = XATTR_CIFS_ACL, | |
385 | .get = cifs_xattr_get, | |
386 | .set = cifs_xattr_set, | |
387 | }; | |
388 | ||
a9ae008f AG |
389 | static const struct xattr_handler cifs_posix_acl_access_xattr_handler = { |
390 | .name = XATTR_NAME_POSIX_ACL_ACCESS, | |
391 | .flags = XATTR_ACL_ACCESS, | |
392 | .get = cifs_xattr_get, | |
393 | .set = cifs_xattr_set, | |
394 | }; | |
395 | ||
396 | static const struct xattr_handler cifs_posix_acl_default_xattr_handler = { | |
397 | .name = XATTR_NAME_POSIX_ACL_DEFAULT, | |
398 | .flags = XATTR_ACL_DEFAULT, | |
399 | .get = cifs_xattr_get, | |
400 | .set = cifs_xattr_set, | |
401 | }; | |
402 | ||
403 | const struct xattr_handler *cifs_xattr_handlers[] = { | |
404 | &cifs_user_xattr_handler, | |
405 | &cifs_os2_xattr_handler, | |
406 | &cifs_cifs_acl_xattr_handler, | |
c4f7173a | 407 | &smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */ |
a9ae008f AG |
408 | &cifs_posix_acl_access_xattr_handler, |
409 | &cifs_posix_acl_default_xattr_handler, | |
410 | NULL | |
411 | }; |