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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> |
1da177e4 LT |
25 | #include "cifsfs.h" |
26 | #include "cifspdu.h" | |
27 | #include "cifsglob.h" | |
28 | #include "cifsproto.h" | |
29 | #include "cifs_debug.h" | |
30 | ||
31 | #define MAX_EA_VALUE_SIZE 65535 | |
32 | #define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib" | |
fbeba8bb | 33 | #define CIFS_XATTR_CIFS_ACL "system.cifs_acl" |
1da177e4 LT |
34 | #define CIFS_XATTR_USER_PREFIX "user." |
35 | #define CIFS_XATTR_SYSTEM_PREFIX "system." | |
36 | #define CIFS_XATTR_OS2_PREFIX "os2." | |
fbeba8bb | 37 | #define CIFS_XATTR_SECURITY_PREFIX "security." |
1da177e4 LT |
38 | #define CIFS_XATTR_TRUSTED_PREFIX "trusted." |
39 | #define XATTR_TRUSTED_PREFIX_LEN 8 | |
40 | #define XATTR_SECURITY_PREFIX_LEN 9 | |
41 | /* BB need to add server (Samba e.g) support for security and trusted prefix */ | |
50c2f753 | 42 | |
1da177e4 LT |
43 | |
44 | ||
79a58d1f | 45 | int cifs_removexattr(struct dentry *direntry, const char *ea_name) |
1da177e4 LT |
46 | { |
47 | int rc = -EOPNOTSUPP; | |
48 | #ifdef CONFIG_CIFS_XATTR | |
49 | int xid; | |
50 | struct cifs_sb_info *cifs_sb; | |
7ffec372 | 51 | struct tcon_link *tlink; |
1da177e4 | 52 | struct cifsTconInfo *pTcon; |
79a58d1f | 53 | struct super_block *sb; |
7ffec372 | 54 | char *full_path = NULL; |
79a58d1f SF |
55 | |
56 | if (direntry == NULL) | |
1da177e4 | 57 | return -EIO; |
79a58d1f | 58 | if (direntry->d_inode == NULL) |
1da177e4 LT |
59 | return -EIO; |
60 | sb = direntry->d_inode->i_sb; | |
79a58d1f | 61 | if (sb == NULL) |
1da177e4 | 62 | return -EIO; |
79a58d1f | 63 | |
1da177e4 | 64 | cifs_sb = CIFS_SB(sb); |
7ffec372 JL |
65 | tlink = cifs_sb_tlink(cifs_sb); |
66 | if (IS_ERR(tlink)) | |
67 | return PTR_ERR(tlink); | |
68 | pTcon = tlink_tcon(tlink); | |
69 | ||
70 | xid = GetXid(); | |
79a58d1f | 71 | |
1da177e4 | 72 | full_path = build_path_from_dentry(direntry); |
79a58d1f | 73 | if (full_path == NULL) { |
0f3bc09e | 74 | rc = -ENOMEM; |
7ffec372 | 75 | goto remove_ea_exit; |
1da177e4 | 76 | } |
79a58d1f | 77 | if (ea_name == NULL) { |
b6b38f70 | 78 | cFYI(1, "Null xattr names not supported"); |
79a58d1f SF |
79 | } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) |
80 | && (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4))) { | |
81 | cFYI(1, | |
b6b38f70 JP |
82 | "illegal xattr request %s (only user namespace supported)", |
83 | ea_name); | |
1da177e4 LT |
84 | /* BB what if no namespace prefix? */ |
85 | /* Should we just pass them to server, except for | |
86 | system and perhaps security prefixes? */ | |
87 | } else { | |
79a58d1f | 88 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
1da177e4 LT |
89 | goto remove_ea_exit; |
90 | ||
79a58d1f SF |
91 | ea_name += 5; /* skip past user. prefix */ |
92 | rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, NULL, | |
737b758c SF |
93 | (__u16)0, cifs_sb->local_nls, |
94 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
95 | } |
96 | remove_ea_exit: | |
f99d49ad | 97 | kfree(full_path); |
1da177e4 | 98 | FreeXid(xid); |
7ffec372 | 99 | cifs_put_tlink(tlink); |
1da177e4 LT |
100 | #endif |
101 | return rc; | |
102 | } | |
103 | ||
79a58d1f SF |
104 | int cifs_setxattr(struct dentry *direntry, const char *ea_name, |
105 | const void *ea_value, size_t value_size, int flags) | |
1da177e4 LT |
106 | { |
107 | int rc = -EOPNOTSUPP; | |
108 | #ifdef CONFIG_CIFS_XATTR | |
109 | int xid; | |
110 | struct cifs_sb_info *cifs_sb; | |
7ffec372 | 111 | struct tcon_link *tlink; |
1da177e4 | 112 | struct cifsTconInfo *pTcon; |
79a58d1f SF |
113 | struct super_block *sb; |
114 | char *full_path; | |
1da177e4 | 115 | |
79a58d1f | 116 | if (direntry == NULL) |
1da177e4 | 117 | return -EIO; |
79a58d1f | 118 | if (direntry->d_inode == NULL) |
1da177e4 LT |
119 | return -EIO; |
120 | sb = direntry->d_inode->i_sb; | |
79a58d1f | 121 | if (sb == NULL) |
1da177e4 | 122 | return -EIO; |
1da177e4 LT |
123 | |
124 | cifs_sb = CIFS_SB(sb); | |
7ffec372 JL |
125 | tlink = cifs_sb_tlink(cifs_sb); |
126 | if (IS_ERR(tlink)) | |
127 | return PTR_ERR(tlink); | |
128 | pTcon = tlink_tcon(tlink); | |
129 | ||
130 | xid = GetXid(); | |
1da177e4 | 131 | |
1da177e4 | 132 | full_path = build_path_from_dentry(direntry); |
79a58d1f | 133 | if (full_path == NULL) { |
0f3bc09e | 134 | rc = -ENOMEM; |
7ffec372 | 135 | goto set_ea_exit; |
1da177e4 LT |
136 | } |
137 | /* return dos attributes as pseudo xattr */ | |
138 | /* return alt name if available as pseudo attr */ | |
139 | ||
140 | /* if proc/fs/cifs/streamstoxattr is set then | |
79a58d1f | 141 | search server for EAs or streams to |
1da177e4 | 142 | returns as xattrs */ |
79a58d1f | 143 | if (value_size > MAX_EA_VALUE_SIZE) { |
b6b38f70 | 144 | cFYI(1, "size of EA value too large"); |
7ffec372 JL |
145 | rc = -EOPNOTSUPP; |
146 | goto set_ea_exit; | |
1da177e4 LT |
147 | } |
148 | ||
79a58d1f | 149 | if (ea_name == NULL) { |
b6b38f70 | 150 | cFYI(1, "Null xattr names not supported"); |
79a58d1f SF |
151 | } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) { |
152 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) | |
1da177e4 | 153 | goto set_ea_exit; |
ad7a2926 | 154 | if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) |
b6b38f70 | 155 | cFYI(1, "attempt to set cifs inode metadata"); |
ad7a2926 | 156 | |
1da177e4 | 157 | ea_name += 5; /* skip past user. prefix */ |
79a58d1f | 158 | rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value, |
737b758c SF |
159 | (__u16)value_size, cifs_sb->local_nls, |
160 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
79a58d1f SF |
161 | } else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) { |
162 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) | |
1da177e4 LT |
163 | goto set_ea_exit; |
164 | ||
165 | ea_name += 4; /* skip past os2. prefix */ | |
79a58d1f | 166 | rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value, |
737b758c SF |
167 | (__u16)value_size, cifs_sb->local_nls, |
168 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 | 169 | } else { |
79a58d1f SF |
170 | int temp; |
171 | temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS, | |
1da177e4 LT |
172 | strlen(POSIX_ACL_XATTR_ACCESS)); |
173 | if (temp == 0) { | |
174 | #ifdef CONFIG_CIFS_POSIX | |
79a58d1f SF |
175 | if (sb->s_flags & MS_POSIXACL) |
176 | rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, | |
177 | ea_value, (const int)value_size, | |
178 | ACL_TYPE_ACCESS, cifs_sb->local_nls, | |
179 | cifs_sb->mnt_cifs_flags & | |
737b758c | 180 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
b6b38f70 | 181 | cFYI(1, "set POSIX ACL rc %d", rc); |
1da177e4 | 182 | #else |
b6b38f70 | 183 | cFYI(1, "set POSIX ACL not supported"); |
1da177e4 | 184 | #endif |
79a58d1f SF |
185 | } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT, |
186 | strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) { | |
1da177e4 | 187 | #ifdef CONFIG_CIFS_POSIX |
79a58d1f SF |
188 | if (sb->s_flags & MS_POSIXACL) |
189 | rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, | |
190 | ea_value, (const int)value_size, | |
737b758c | 191 | ACL_TYPE_DEFAULT, cifs_sb->local_nls, |
79a58d1f | 192 | cifs_sb->mnt_cifs_flags & |
737b758c | 193 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
b6b38f70 | 194 | cFYI(1, "set POSIX default ACL rc %d", rc); |
1da177e4 | 195 | #else |
b6b38f70 | 196 | cFYI(1, "set default POSIX ACL not supported"); |
1da177e4 LT |
197 | #endif |
198 | } else { | |
b6b38f70 JP |
199 | cFYI(1, "illegal xattr request %s (only user namespace" |
200 | " supported)", ea_name); | |
1da177e4 | 201 | /* BB what if no namespace prefix? */ |
79a58d1f | 202 | /* Should we just pass them to server, except for |
1da177e4 LT |
203 | system and perhaps security prefixes? */ |
204 | } | |
205 | } | |
206 | ||
207 | set_ea_exit: | |
f99d49ad | 208 | kfree(full_path); |
1da177e4 | 209 | FreeXid(xid); |
7ffec372 | 210 | cifs_put_tlink(tlink); |
1da177e4 LT |
211 | #endif |
212 | return rc; | |
213 | } | |
214 | ||
79a58d1f SF |
215 | ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name, |
216 | void *ea_value, size_t buf_size) | |
1da177e4 LT |
217 | { |
218 | ssize_t rc = -EOPNOTSUPP; | |
219 | #ifdef CONFIG_CIFS_XATTR | |
220 | int xid; | |
221 | struct cifs_sb_info *cifs_sb; | |
7ffec372 | 222 | struct tcon_link *tlink; |
1da177e4 | 223 | struct cifsTconInfo *pTcon; |
79a58d1f SF |
224 | struct super_block *sb; |
225 | char *full_path; | |
1da177e4 | 226 | |
79a58d1f | 227 | if (direntry == NULL) |
1da177e4 | 228 | return -EIO; |
79a58d1f | 229 | if (direntry->d_inode == NULL) |
1da177e4 LT |
230 | return -EIO; |
231 | sb = direntry->d_inode->i_sb; | |
79a58d1f | 232 | if (sb == NULL) |
1da177e4 LT |
233 | return -EIO; |
234 | ||
1da177e4 | 235 | cifs_sb = CIFS_SB(sb); |
7ffec372 JL |
236 | tlink = cifs_sb_tlink(cifs_sb); |
237 | if (IS_ERR(tlink)) | |
238 | return PTR_ERR(tlink); | |
239 | pTcon = tlink_tcon(tlink); | |
240 | ||
241 | xid = GetXid(); | |
1da177e4 | 242 | |
1da177e4 | 243 | full_path = build_path_from_dentry(direntry); |
79a58d1f | 244 | if (full_path == NULL) { |
0f3bc09e | 245 | rc = -ENOMEM; |
7ffec372 | 246 | goto get_ea_exit; |
1da177e4 LT |
247 | } |
248 | /* return dos attributes as pseudo xattr */ | |
249 | /* return alt name if available as pseudo attr */ | |
79a58d1f | 250 | if (ea_name == NULL) { |
b6b38f70 | 251 | cFYI(1, "Null xattr names not supported"); |
79a58d1f SF |
252 | } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) { |
253 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) | |
1da177e4 LT |
254 | goto get_ea_exit; |
255 | ||
79a58d1f | 256 | if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) { |
b6b38f70 | 257 | cFYI(1, "attempt to query cifs inode metadata"); |
1da177e4 LT |
258 | /* revalidate/getattr then populate from inode */ |
259 | } /* BB add else when above is implemented */ | |
260 | ea_name += 5; /* skip past user. prefix */ | |
31c0519f | 261 | rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value, |
737b758c SF |
262 | buf_size, cifs_sb->local_nls, |
263 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
79a58d1f SF |
264 | } else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) { |
265 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) | |
1da177e4 LT |
266 | goto get_ea_exit; |
267 | ||
268 | ea_name += 4; /* skip past os2. prefix */ | |
31c0519f | 269 | rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value, |
737b758c SF |
270 | buf_size, cifs_sb->local_nls, |
271 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
79a58d1f | 272 | } else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS, |
0a4b92c0 | 273 | strlen(POSIX_ACL_XATTR_ACCESS)) == 0) { |
1da177e4 | 274 | #ifdef CONFIG_CIFS_POSIX |
79a58d1f | 275 | if (sb->s_flags & MS_POSIXACL) |
1da0c78b | 276 | rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, |
79a58d1f | 277 | ea_value, buf_size, ACL_TYPE_ACCESS, |
737b758c | 278 | cifs_sb->local_nls, |
79a58d1f | 279 | cifs_sb->mnt_cifs_flags & |
737b758c | 280 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
79a58d1f | 281 | #else |
fbeba8bb | 282 | cFYI(1, "Query POSIX ACL not supported yet"); |
1da177e4 | 283 | #endif /* CONFIG_CIFS_POSIX */ |
79a58d1f | 284 | } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT, |
0a4b92c0 | 285 | strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) { |
1da177e4 | 286 | #ifdef CONFIG_CIFS_POSIX |
79a58d1f | 287 | if (sb->s_flags & MS_POSIXACL) |
1da0c78b | 288 | rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, |
79a58d1f | 289 | ea_value, buf_size, ACL_TYPE_DEFAULT, |
737b758c | 290 | cifs_sb->local_nls, |
79a58d1f | 291 | cifs_sb->mnt_cifs_flags & |
737b758c | 292 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
79a58d1f | 293 | #else |
fbeba8bb SP |
294 | cFYI(1, "Query POSIX default ACL not supported yet"); |
295 | #endif /* CONFIG_CIFS_POSIX */ | |
296 | } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL, | |
297 | strlen(CIFS_XATTR_CIFS_ACL)) == 0) { | |
298 | #ifdef CONFIG_CIFS_ACL | |
299 | u32 acllen; | |
300 | struct cifs_ntsd *pacl; | |
301 | ||
302 | pacl = get_cifs_acl(cifs_sb, direntry->d_inode, | |
303 | full_path, &acllen); | |
304 | if (IS_ERR(pacl)) { | |
305 | rc = PTR_ERR(pacl); | |
306 | cERROR(1, "%s: error %zd getting sec desc", | |
307 | __func__, rc); | |
308 | } else { | |
309 | if (ea_value) { | |
310 | if (acllen > buf_size) | |
311 | acllen = -ERANGE; | |
312 | else | |
313 | memcpy(ea_value, pacl, acllen); | |
314 | } | |
315 | rc = acllen; | |
316 | kfree(pacl); | |
317 | } | |
318 | #else | |
319 | cFYI(1, "Query CIFS ACL not supported yet"); | |
320 | #endif /* CONFIG_CIFS_ACL */ | |
79a58d1f SF |
321 | } else if (strncmp(ea_name, |
322 | CIFS_XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) { | |
b6b38f70 | 323 | cFYI(1, "Trusted xattr namespace not supported yet"); |
79a58d1f SF |
324 | } else if (strncmp(ea_name, |
325 | CIFS_XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) { | |
b6b38f70 | 326 | cFYI(1, "Security xattr namespace not supported yet"); |
ad7a2926 | 327 | } else |
79a58d1f | 328 | cFYI(1, |
b6b38f70 JP |
329 | "illegal xattr request %s (only user namespace supported)", |
330 | ea_name); | |
1da177e4 | 331 | |
79a58d1f | 332 | /* We could add an additional check for streams ie |
1da177e4 | 333 | if proc/fs/cifs/streamstoxattr is set then |
79a58d1f | 334 | search server for EAs or streams to |
1da177e4 LT |
335 | returns as xattrs */ |
336 | ||
79a58d1f SF |
337 | if (rc == -EINVAL) |
338 | rc = -EOPNOTSUPP; | |
1da177e4 LT |
339 | |
340 | get_ea_exit: | |
f99d49ad | 341 | kfree(full_path); |
1da177e4 | 342 | FreeXid(xid); |
7ffec372 | 343 | cifs_put_tlink(tlink); |
1da177e4 LT |
344 | #endif |
345 | return rc; | |
346 | } | |
347 | ||
79a58d1f | 348 | ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size) |
1da177e4 LT |
349 | { |
350 | ssize_t rc = -EOPNOTSUPP; | |
351 | #ifdef CONFIG_CIFS_XATTR | |
352 | int xid; | |
353 | struct cifs_sb_info *cifs_sb; | |
7ffec372 | 354 | struct tcon_link *tlink; |
1da177e4 | 355 | struct cifsTconInfo *pTcon; |
79a58d1f SF |
356 | struct super_block *sb; |
357 | char *full_path; | |
1da177e4 | 358 | |
79a58d1f | 359 | if (direntry == NULL) |
1da177e4 | 360 | return -EIO; |
79a58d1f | 361 | if (direntry->d_inode == NULL) |
1da177e4 LT |
362 | return -EIO; |
363 | sb = direntry->d_inode->i_sb; | |
79a58d1f | 364 | if (sb == NULL) |
1da177e4 | 365 | return -EIO; |
1da177e4 LT |
366 | |
367 | cifs_sb = CIFS_SB(sb); | |
79a58d1f | 368 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
ea4c07d7 SF |
369 | return -EOPNOTSUPP; |
370 | ||
7ffec372 JL |
371 | tlink = cifs_sb_tlink(cifs_sb); |
372 | if (IS_ERR(tlink)) | |
373 | return PTR_ERR(tlink); | |
374 | pTcon = tlink_tcon(tlink); | |
375 | ||
ea4c07d7 SF |
376 | xid = GetXid(); |
377 | ||
1da177e4 | 378 | full_path = build_path_from_dentry(direntry); |
79a58d1f | 379 | if (full_path == NULL) { |
0f3bc09e | 380 | rc = -ENOMEM; |
7ffec372 | 381 | goto list_ea_exit; |
1da177e4 LT |
382 | } |
383 | /* return dos attributes as pseudo xattr */ | |
384 | /* return alt name if available as pseudo attr */ | |
385 | ||
386 | /* if proc/fs/cifs/streamstoxattr is set then | |
79a58d1f | 387 | search server for EAs or streams to |
1da177e4 | 388 | returns as xattrs */ |
31c0519f JL |
389 | rc = CIFSSMBQAllEAs(xid, pTcon, full_path, NULL, data, |
390 | buf_size, cifs_sb->local_nls, | |
79a58d1f | 391 | cifs_sb->mnt_cifs_flags & |
737b758c | 392 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 393 | |
7ffec372 | 394 | list_ea_exit: |
f99d49ad | 395 | kfree(full_path); |
1da177e4 | 396 | FreeXid(xid); |
7ffec372 | 397 | cifs_put_tlink(tlink); |
1da177e4 LT |
398 | #endif |
399 | return rc; | |
400 | } |