1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 *
4 * Copyright (c) International Business Machines Corp., 2003, 2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 */
8
9 #include <linux/fs.h>
10 #include <linux/posix_acl_xattr.h>
11 #include <linux/slab.h>
12 #include <linux/xattr.h>
13 #include "cifsfs.h"
14 #include "cifspdu.h"
15 #include "cifsglob.h"
16 #include "cifsproto.h"
17 #include "cifs_debug.h"
18 #include "cifs_fs_sb.h"
19 #include "cifs_unicode.h"
20 #include "cifs_ioctl.h"
21
22 #define MAX_EA_VALUE_SIZE CIFSMaxBufSize
23 #define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
24 #define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
25 #define CIFS_XATTR_CIFS_NTSD_FULL "system.cifs_ntsd_full" /* owner/DACL/SACL */
26 #define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
27 #define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
28 /*
29 * Although these three are just aliases for the above, need to move away from
30 * confusing users and using the 20+ year old term 'cifs' when it is no longer
31 * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
32 */
33 #define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
34 #define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
35 #define SMB3_XATTR_CIFS_NTSD_FULL "system.smb3_ntsd_full" /* owner/DACL/SACL */
36 #define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
37 #define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
38 /* BB need to add server (Samba e.g) support for security and trusted prefix */
39
40 enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
41 XATTR_CIFS_NTSD, XATTR_CIFS_NTSD_FULL };
42
cifs_attrib_set(unsigned int xid,struct cifs_tcon * pTcon,struct inode * inode,const char * full_path,const void * value,size_t size)43 static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
44 struct inode *inode, const char *full_path,
45 const void *value, size_t size)
46 {
47 ssize_t rc = -EOPNOTSUPP;
48 __u32 *pattrib = (__u32 *)value;
49 __u32 attrib;
50 FILE_BASIC_INFO info_buf;
51
52 if ((value == NULL) || (size != sizeof(__u32)))
53 return -ERANGE;
54
55 memset(&info_buf, 0, sizeof(info_buf));
56 attrib = *pattrib;
57 info_buf.Attributes = cpu_to_le32(attrib);
58 if (pTcon->ses->server->ops->set_file_info)
59 rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
60 &info_buf, xid);
61 if (rc == 0)
62 CIFS_I(inode)->cifsAttrs = attrib;
63
64 return rc;
65 }
66
cifs_creation_time_set(unsigned int xid,struct cifs_tcon * pTcon,struct inode * inode,const char * full_path,const void * value,size_t size)67 static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
68 struct inode *inode, const char *full_path,
69 const void *value, size_t size)
70 {
71 ssize_t rc = -EOPNOTSUPP;
72 __u64 *pcreation_time = (__u64 *)value;
73 __u64 creation_time;
74 FILE_BASIC_INFO info_buf;
75
76 if ((value == NULL) || (size != sizeof(__u64)))
77 return -ERANGE;
78
79 memset(&info_buf, 0, sizeof(info_buf));
80 creation_time = *pcreation_time;
81 info_buf.CreationTime = cpu_to_le64(creation_time);
82 if (pTcon->ses->server->ops->set_file_info)
83 rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
84 &info_buf, xid);
85 if (rc == 0)
86 CIFS_I(inode)->createtime = creation_time;
87
88 return rc;
89 }
90
cifs_xattr_set(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * dentry,struct inode * inode,const char * name,const void * value,size_t size,int flags)91 static int cifs_xattr_set(const struct xattr_handler *handler,
92 struct user_namespace *mnt_userns,
93 struct dentry *dentry, struct inode *inode,
94 const char *name, const void *value,
95 size_t size, int flags)
96 {
97 int rc = -EOPNOTSUPP;
98 unsigned int xid;
99 struct super_block *sb = dentry->d_sb;
100 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
101 struct tcon_link *tlink;
102 struct cifs_tcon *pTcon;
103 const char *full_path;
104 void *page;
105
106 tlink = cifs_sb_tlink(cifs_sb);
107 if (IS_ERR(tlink))
108 return PTR_ERR(tlink);
109 pTcon = tlink_tcon(tlink);
110
111 xid = get_xid();
112 page = alloc_dentry_path();
113
114 full_path = build_path_from_dentry(dentry, page);
115 if (IS_ERR(full_path)) {
116 rc = PTR_ERR(full_path);
117 goto out;
118 }
119 /* return dos attributes as pseudo xattr */
120 /* return alt name if available as pseudo attr */
121
122 /* if proc/fs/cifs/streamstoxattr is set then
123 search server for EAs or streams to
124 returns as xattrs */
125 if (size > MAX_EA_VALUE_SIZE) {
126 cifs_dbg(FYI, "size of EA value too large\n");
127 rc = -EOPNOTSUPP;
128 goto out;
129 }
130
131 switch (handler->flags) {
132 case XATTR_USER:
133 cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
134 if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
135 (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
136 rc = cifs_attrib_set(xid, pTcon, inode, full_path,
137 value, size);
138 if (rc == 0) /* force revalidate of the inode */
139 CIFS_I(inode)->time = 0;
140 break;
141 } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
142 (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
143 rc = cifs_creation_time_set(xid, pTcon, inode,
144 full_path, value, size);
145 if (rc == 0) /* force revalidate of the inode */
146 CIFS_I(inode)->time = 0;
147 break;
148 }
149
150 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
151 goto out;
152
153 if (pTcon->ses->server->ops->set_EA)
154 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
155 full_path, name, value, (__u16)size,
156 cifs_sb->local_nls, cifs_sb);
157 break;
158
159 case XATTR_CIFS_ACL:
160 case XATTR_CIFS_NTSD:
161 case XATTR_CIFS_NTSD_FULL: {
162 struct cifs_ntsd *pacl;
163
164 if (!value)
165 goto out;
166 pacl = kmalloc(size, GFP_KERNEL);
167 if (!pacl) {
168 rc = -ENOMEM;
169 } else {
170 memcpy(pacl, value, size);
171 if (pTcon->ses->server->ops->set_acl) {
172 int aclflags = 0;
173 rc = 0;
174
175 switch (handler->flags) {
176 case XATTR_CIFS_NTSD_FULL:
177 aclflags = (CIFS_ACL_OWNER |
178 CIFS_ACL_DACL |
179 CIFS_ACL_SACL);
180 break;
181 case XATTR_CIFS_NTSD:
182 aclflags = (CIFS_ACL_OWNER |
183 CIFS_ACL_DACL);
184 break;
185 case XATTR_CIFS_ACL:
186 default:
187 aclflags = CIFS_ACL_DACL;
188 }
189
190 rc = pTcon->ses->server->ops->set_acl(pacl,
191 size, inode, full_path, aclflags);
192 } else {
193 rc = -EOPNOTSUPP;
194 }
195 if (rc == 0) /* force revalidate of the inode */
196 CIFS_I(inode)->time = 0;
197 kfree(pacl);
198 }
199 break;
200 }
201
202 case XATTR_ACL_ACCESS:
203 #ifdef CONFIG_CIFS_POSIX
204 if (!value)
205 goto out;
206 if (sb->s_flags & SB_POSIXACL)
207 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
208 value, (const int)size,
209 ACL_TYPE_ACCESS, cifs_sb->local_nls,
210 cifs_remap(cifs_sb));
211 #endif /* CONFIG_CIFS_POSIX */
212 break;
213
214 case XATTR_ACL_DEFAULT:
215 #ifdef CONFIG_CIFS_POSIX
216 if (!value)
217 goto out;
218 if (sb->s_flags & SB_POSIXACL)
219 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
220 value, (const int)size,
221 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
222 cifs_remap(cifs_sb));
223 #endif /* CONFIG_CIFS_POSIX */
224 break;
225 }
226
227 out:
228 free_dentry_path(page);
229 free_xid(xid);
230 cifs_put_tlink(tlink);
231 return rc;
232 }
233
cifs_attrib_get(struct dentry * dentry,struct inode * inode,void * value,size_t size)234 static int cifs_attrib_get(struct dentry *dentry,
235 struct inode *inode, void *value,
236 size_t size)
237 {
238 ssize_t rc;
239 __u32 *pattribute;
240
241 rc = cifs_revalidate_dentry_attr(dentry);
242
243 if (rc)
244 return rc;
245
246 if ((value == NULL) || (size == 0))
247 return sizeof(__u32);
248 else if (size < sizeof(__u32))
249 return -ERANGE;
250
251 /* return dos attributes as pseudo xattr */
252 pattribute = (__u32 *)value;
253 *pattribute = CIFS_I(inode)->cifsAttrs;
254
255 return sizeof(__u32);
256 }
257
cifs_creation_time_get(struct dentry * dentry,struct inode * inode,void * value,size_t size)258 static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
259 void *value, size_t size)
260 {
261 ssize_t rc;
262 __u64 *pcreatetime;
263
264 rc = cifs_revalidate_dentry_attr(dentry);
265 if (rc)
266 return rc;
267
268 if ((value == NULL) || (size == 0))
269 return sizeof(__u64);
270 else if (size < sizeof(__u64))
271 return -ERANGE;
272
273 /* return dos attributes as pseudo xattr */
274 pcreatetime = (__u64 *)value;
275 *pcreatetime = CIFS_I(inode)->createtime;
276 return sizeof(__u64);
277 }
278
279
cifs_xattr_get(const struct xattr_handler * handler,struct dentry * dentry,struct inode * inode,const char * name,void * value,size_t size)280 static int cifs_xattr_get(const struct xattr_handler *handler,
281 struct dentry *dentry, struct inode *inode,
282 const char *name, void *value, size_t size)
283 {
284 ssize_t rc = -EOPNOTSUPP;
285 unsigned int xid;
286 struct super_block *sb = dentry->d_sb;
287 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
288 struct tcon_link *tlink;
289 struct cifs_tcon *pTcon;
290 const char *full_path;
291 void *page;
292
293 tlink = cifs_sb_tlink(cifs_sb);
294 if (IS_ERR(tlink))
295 return PTR_ERR(tlink);
296 pTcon = tlink_tcon(tlink);
297
298 xid = get_xid();
299 page = alloc_dentry_path();
300
301 full_path = build_path_from_dentry(dentry, page);
302 if (IS_ERR(full_path)) {
303 rc = PTR_ERR(full_path);
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 case XATTR_CIFS_NTSD_FULL: {
332 /*
333 * fetch owner, DACL, and SACL if asked for full descriptor,
334 * fetch owner and DACL otherwise
335 */
336 u32 acllen, extra_info;
337 struct cifs_ntsd *pacl;
338
339 if (pTcon->ses->server->ops->get_acl == NULL)
340 goto out; /* rc already EOPNOTSUPP */
341
342 if (handler->flags == XATTR_CIFS_NTSD_FULL) {
343 extra_info = SACL_SECINFO;
344 } else {
345 extra_info = 0;
346 }
347 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
348 inode, full_path, &acllen, extra_info);
349 if (IS_ERR(pacl)) {
350 rc = PTR_ERR(pacl);
351 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
352 __func__, rc);
353 } else {
354 if (value) {
355 if (acllen > size)
356 acllen = -ERANGE;
357 else
358 memcpy(value, pacl, acllen);
359 }
360 rc = acllen;
361 kfree(pacl);
362 }
363 break;
364 }
365
366 case XATTR_ACL_ACCESS:
367 #ifdef CONFIG_CIFS_POSIX
368 if (sb->s_flags & SB_POSIXACL)
369 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
370 value, size, ACL_TYPE_ACCESS,
371 cifs_sb->local_nls,
372 cifs_remap(cifs_sb));
373 #endif /* CONFIG_CIFS_POSIX */
374 break;
375
376 case XATTR_ACL_DEFAULT:
377 #ifdef CONFIG_CIFS_POSIX
378 if (sb->s_flags & SB_POSIXACL)
379 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
380 value, size, ACL_TYPE_DEFAULT,
381 cifs_sb->local_nls,
382 cifs_remap(cifs_sb));
383 #endif /* CONFIG_CIFS_POSIX */
384 break;
385 }
386
387 /* We could add an additional check for streams ie
388 if proc/fs/cifs/streamstoxattr is set then
389 search server for EAs or streams to
390 returns as xattrs */
391
392 if (rc == -EINVAL)
393 rc = -EOPNOTSUPP;
394
395 out:
396 free_dentry_path(page);
397 free_xid(xid);
398 cifs_put_tlink(tlink);
399 return rc;
400 }
401
cifs_listxattr(struct dentry * direntry,char * data,size_t buf_size)402 ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
403 {
404 ssize_t rc = -EOPNOTSUPP;
405 unsigned int xid;
406 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
407 struct tcon_link *tlink;
408 struct cifs_tcon *pTcon;
409 const char *full_path;
410 void *page;
411
412 if (unlikely(cifs_forced_shutdown(cifs_sb)))
413 return -EIO;
414
415 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
416 return -EOPNOTSUPP;
417
418 tlink = cifs_sb_tlink(cifs_sb);
419 if (IS_ERR(tlink))
420 return PTR_ERR(tlink);
421 pTcon = tlink_tcon(tlink);
422
423 xid = get_xid();
424 page = alloc_dentry_path();
425
426 full_path = build_path_from_dentry(direntry, page);
427 if (IS_ERR(full_path)) {
428 rc = PTR_ERR(full_path);
429 goto list_ea_exit;
430 }
431 /* return dos attributes as pseudo xattr */
432 /* return alt name if available as pseudo attr */
433
434 /* if proc/fs/cifs/streamstoxattr is set then
435 search server for EAs or streams to
436 returns as xattrs */
437
438 if (pTcon->ses->server->ops->query_all_EAs)
439 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
440 full_path, NULL, data, buf_size, cifs_sb);
441 list_ea_exit:
442 free_dentry_path(page);
443 free_xid(xid);
444 cifs_put_tlink(tlink);
445 return rc;
446 }
447
448 static const struct xattr_handler cifs_user_xattr_handler = {
449 .prefix = XATTR_USER_PREFIX,
450 .flags = XATTR_USER,
451 .get = cifs_xattr_get,
452 .set = cifs_xattr_set,
453 };
454
455 /* os2.* attributes are treated like user.* attributes */
456 static const struct xattr_handler cifs_os2_xattr_handler = {
457 .prefix = XATTR_OS2_PREFIX,
458 .flags = XATTR_USER,
459 .get = cifs_xattr_get,
460 .set = cifs_xattr_set,
461 };
462
463 static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
464 .name = CIFS_XATTR_CIFS_ACL,
465 .flags = XATTR_CIFS_ACL,
466 .get = cifs_xattr_get,
467 .set = cifs_xattr_set,
468 };
469
470 /*
471 * Although this is just an alias for the above, need to move away from
472 * confusing users and using the 20 year old term 'cifs' when it is no
473 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
474 * SMB3 and later are highly secure.
475 */
476 static const struct xattr_handler smb3_acl_xattr_handler = {
477 .name = SMB3_XATTR_CIFS_ACL,
478 .flags = XATTR_CIFS_ACL,
479 .get = cifs_xattr_get,
480 .set = cifs_xattr_set,
481 };
482
483 static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
484 .name = CIFS_XATTR_CIFS_NTSD,
485 .flags = XATTR_CIFS_NTSD,
486 .get = cifs_xattr_get,
487 .set = cifs_xattr_set,
488 };
489
490 /*
491 * Although this is just an alias for the above, need to move away from
492 * confusing users and using the 20 year old term 'cifs' when it is no
493 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
494 * SMB3 and later are highly secure.
495 */
496 static const struct xattr_handler smb3_ntsd_xattr_handler = {
497 .name = SMB3_XATTR_CIFS_NTSD,
498 .flags = XATTR_CIFS_NTSD,
499 .get = cifs_xattr_get,
500 .set = cifs_xattr_set,
501 };
502
503 static const struct xattr_handler cifs_cifs_ntsd_full_xattr_handler = {
504 .name = CIFS_XATTR_CIFS_NTSD_FULL,
505 .flags = XATTR_CIFS_NTSD_FULL,
506 .get = cifs_xattr_get,
507 .set = cifs_xattr_set,
508 };
509
510 /*
511 * Although this is just an alias for the above, need to move away from
512 * confusing users and using the 20 year old term 'cifs' when it is no
513 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
514 * SMB3 and later are highly secure.
515 */
516 static const struct xattr_handler smb3_ntsd_full_xattr_handler = {
517 .name = SMB3_XATTR_CIFS_NTSD_FULL,
518 .flags = XATTR_CIFS_NTSD_FULL,
519 .get = cifs_xattr_get,
520 .set = cifs_xattr_set,
521 };
522
523
524 static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
525 .name = XATTR_NAME_POSIX_ACL_ACCESS,
526 .flags = XATTR_ACL_ACCESS,
527 .get = cifs_xattr_get,
528 .set = cifs_xattr_set,
529 };
530
531 static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
532 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
533 .flags = XATTR_ACL_DEFAULT,
534 .get = cifs_xattr_get,
535 .set = cifs_xattr_set,
536 };
537
538 const struct xattr_handler *cifs_xattr_handlers[] = {
539 &cifs_user_xattr_handler,
540 &cifs_os2_xattr_handler,
541 &cifs_cifs_acl_xattr_handler,
542 &smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
543 &cifs_cifs_ntsd_xattr_handler,
544 &smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
545 &cifs_cifs_ntsd_full_xattr_handler,
546 &smb3_ntsd_full_xattr_handler, /* alias for above since avoiding "cifs" */
547 &cifs_posix_acl_access_xattr_handler,
548 &cifs_posix_acl_default_xattr_handler,
549 NULL
550 };
551
