blob: 20af5187ba63cc14150185952a3f7cdf9526556d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/xattr.c
3 *
Steve French79a58d12007-07-06 22:44:50 +00004 * Copyright (c) International Business Machines Corp., 2003, 2007
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Mimi Zoharf995e742011-08-11 16:00:47 -040025#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "cifsfs.h"
27#include "cifspdu.h"
28#include "cifsglob.h"
29#include "cifsproto.h"
30#include "cifs_debug.h"
Steve French2baa2682014-09-27 02:19:01 -050031#include "cifs_fs_sb.h"
32#include "cifs_unicode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#define MAX_EA_VALUE_SIZE 65535
Shirish Pargaonkarfbeba8b2010-11-27 11:37:54 -060035#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
Steve Frencha958fff2016-09-19 11:14:06 -050036#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
Steve French66098042016-09-20 03:05:57 -050037#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038/* BB need to add server (Samba e.g) support for security and trusted prefix */
Steve French50c2f752007-07-13 00:33:32 +000039
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020040enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
41
42static int cifs_xattr_set(const struct xattr_handler *handler,
Al Viro59301222016-05-27 10:19:30 -040043 struct dentry *dentry, struct inode *inode,
44 const char *name, const void *value,
45 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
47 int rc = -EOPNOTSUPP;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +040048 unsigned int xid;
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020049 struct super_block *sb = dentry->d_sb;
Al Viro5fdccfe2016-04-10 17:07:33 -040050 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Jeff Layton7ffec372010-09-29 19:51:11 -040051 struct tcon_link *tlink;
Steve French96daf2b2011-05-27 04:34:02 +000052 struct cifs_tcon *pTcon;
Steve French79a58d12007-07-06 22:44:50 +000053 char *full_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Jeff Layton7ffec372010-09-29 19:51:11 -040055 tlink = cifs_sb_tlink(cifs_sb);
56 if (IS_ERR(tlink))
57 return PTR_ERR(tlink);
58 pTcon = tlink_tcon(tlink);
59
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +040060 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020062 full_path = build_path_from_dentry(dentry);
Steve French79a58d12007-07-06 22:44:50 +000063 if (full_path == NULL) {
Suresh Jayaraman0f3bc092009-06-25 18:12:34 +053064 rc = -ENOMEM;
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020065 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 }
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
Steve French79a58d12007-07-06 22:44:50 +000071 search server for EAs or streams to
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 returns as xattrs */
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020073 if (size > MAX_EA_VALUE_SIZE) {
Joe Perchesf96637b2013-05-04 22:12:25 -050074 cifs_dbg(FYI, "size of EA value too large\n");
Jeff Layton7ffec372010-09-29 19:51:11 -040075 rc = -EOPNOTSUPP;
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020076 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 }
78
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020079 switch (handler->flags) {
80 case XATTR_USER:
Steve French79a58d12007-07-06 22:44:50 +000081 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020082 goto out;
Steve Frenchad7a2922008-02-07 23:25:02 +000083
Steve French666753c2014-01-26 23:53:43 -060084 if (pTcon->ses->server->ops->set_EA)
85 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020086 full_path, name, value, (__u16)size,
Steve French2baa2682014-09-27 02:19:01 -050087 cifs_sb->local_nls, cifs_remap(cifs_sb));
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020088 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020090 case XATTR_CIFS_ACL: {
Santosh Nayakb0f8ef22012-03-02 11:47:26 +053091#ifdef CONFIG_CIFS_ACL
92 struct cifs_ntsd *pacl;
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +020093
94 if (!value)
95 goto out;
96 pacl = kmalloc(size, GFP_KERNEL);
Steve Frenchb73b9a42011-04-19 18:27:10 +000097 if (!pacl) {
Steve Frenchb73b9a42011-04-19 18:27:10 +000098 rc = -ENOMEM;
99 } else {
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200100 memcpy(pacl, value, size);
101 if (value &&
102 pTcon->ses->server->ops->set_acl)
Steve French83e3bc22014-02-02 23:31:47 -0600103 rc = pTcon->ses->server->ops->set_acl(pacl,
Al Viro59301222016-05-27 10:19:30 -0400104 size, inode,
Steve French83e3bc22014-02-02 23:31:47 -0600105 full_path, CIFS_ACL_DACL);
106 else
107 rc = -EOPNOTSUPP;
Steve Frenchb73b9a42011-04-19 18:27:10 +0000108 if (rc == 0) /* force revalidate of the inode */
Al Viro59301222016-05-27 10:19:30 -0400109 CIFS_I(inode)->time = 0;
Steve Frenchb73b9a42011-04-19 18:27:10 +0000110 kfree(pacl);
Santosh Nayakb0f8ef22012-03-02 11:47:26 +0530111 }
Steve Frenchb73b9a42011-04-19 18:27:10 +0000112#endif /* CONFIG_CIFS_ACL */
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200113 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
115
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200116 case XATTR_ACL_ACCESS:
117#ifdef CONFIG_CIFS_POSIX
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:
129#ifdef CONFIG_CIFS_POSIX
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;
139 }
140
141out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800142 kfree(full_path);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400143 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400144 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 return rc;
146}
147
Steve Frencha958fff2016-09-19 11:14:06 -0500148static 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
Steve French66098042016-09-20 03:05:57 -0500172static 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
Steve Frencha958fff2016-09-19 11:14:06 -0500195
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200196static 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
200 ssize_t rc = -EOPNOTSUPP;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400201 unsigned int xid;
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200202 struct super_block *sb = dentry->d_sb;
Al Viro5fdccfe2016-04-10 17:07:33 -0400203 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Jeff Layton7ffec372010-09-29 19:51:11 -0400204 struct tcon_link *tlink;
Steve French96daf2b2011-05-27 04:34:02 +0000205 struct cifs_tcon *pTcon;
Steve French79a58d12007-07-06 22:44:50 +0000206 char *full_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Jeff Layton7ffec372010-09-29 19:51:11 -0400208 tlink = cifs_sb_tlink(cifs_sb);
209 if (IS_ERR(tlink))
210 return PTR_ERR(tlink);
211 pTcon = tlink_tcon(tlink);
212
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400213 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200215 full_path = build_path_from_dentry(dentry);
Steve French79a58d12007-07-06 22:44:50 +0000216 if (full_path == NULL) {
Suresh Jayaraman0f3bc092009-06-25 18:12:34 +0530217 rc = -ENOMEM;
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200218 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 }
Steve Frencha958fff2016-09-19 11:14:06 -0500220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 /* return alt name if available as pseudo attr */
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200222 switch (handler->flags) {
223 case XATTR_USER:
Steve Frencha958fff2016-09-19 11:14:06 -0500224 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;
Steve French66098042016-09-20 03:05:57 -0500228 } else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
229 rc = cifs_creation_time_get(dentry, inode, value, size);
230 break;
Steve Frencha958fff2016-09-19 11:14:06 -0500231 }
232
Steve French79a58d12007-07-06 22:44:50 +0000233 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200234 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Steve French666753c2014-01-26 23:53:43 -0600236 if (pTcon->ses->server->ops->query_all_EAs)
237 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200238 full_path, name, value, size,
Steve French2baa2682014-09-27 02:19:01 -0500239 cifs_sb->local_nls, cifs_remap(cifs_sb));
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200240 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200242 case XATTR_CIFS_ACL: {
Shirish Pargaonkarfbeba8b2010-11-27 11:37:54 -0600243#ifdef CONFIG_CIFS_ACL
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200244 u32 acllen;
245 struct cifs_ntsd *pacl;
Shirish Pargaonkarfbeba8b2010-11-27 11:37:54 -0600246
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200247 if (pTcon->ses->server->ops->get_acl == NULL)
248 goto out; /* rc already EOPNOTSUPP */
Steve French83e3bc22014-02-02 23:31:47 -0600249
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200250 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);
Shirish Pargaonkarfbeba8b2010-11-27 11:37:54 -0600262 }
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200263 rc = acllen;
264 kfree(pacl);
265 }
266#endif /* CONFIG_CIFS_ACL */
267 break;
268 }
269
270 case XATTR_ACL_ACCESS:
271#ifdef CONFIG_CIFS_POSIX
272 if (sb->s_flags & MS_POSIXACL)
273 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
274 value, size, ACL_TYPE_ACCESS,
275 cifs_sb->local_nls,
276 cifs_remap(cifs_sb));
277#endif /* CONFIG_CIFS_POSIX */
278 break;
279
280 case XATTR_ACL_DEFAULT:
281#ifdef CONFIG_CIFS_POSIX
282 if (sb->s_flags & MS_POSIXACL)
283 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
284 value, size, ACL_TYPE_DEFAULT,
285 cifs_sb->local_nls,
286 cifs_remap(cifs_sb));
287#endif /* CONFIG_CIFS_POSIX */
288 break;
289 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Steve French79a58d12007-07-06 22:44:50 +0000291 /* We could add an additional check for streams ie
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 if proc/fs/cifs/streamstoxattr is set then
Steve French79a58d12007-07-06 22:44:50 +0000293 search server for EAs or streams to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 returns as xattrs */
295
Steve French79a58d12007-07-06 22:44:50 +0000296 if (rc == -EINVAL)
297 rc = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200299out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800300 kfree(full_path);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400301 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400302 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return rc;
304}
305
Steve French79a58d12007-07-06 22:44:50 +0000306ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307{
308 ssize_t rc = -EOPNOTSUPP;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400309 unsigned int xid;
Al Viro5fdccfe2016-04-10 17:07:33 -0400310 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
Jeff Layton7ffec372010-09-29 19:51:11 -0400311 struct tcon_link *tlink;
Steve French96daf2b2011-05-27 04:34:02 +0000312 struct cifs_tcon *pTcon;
Steve French79a58d12007-07-06 22:44:50 +0000313 char *full_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Steve French79a58d12007-07-06 22:44:50 +0000315 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
Steve Frenchea4c07d2006-08-16 19:44:25 +0000316 return -EOPNOTSUPP;
317
Jeff Layton7ffec372010-09-29 19:51:11 -0400318 tlink = cifs_sb_tlink(cifs_sb);
319 if (IS_ERR(tlink))
320 return PTR_ERR(tlink);
321 pTcon = tlink_tcon(tlink);
322
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400323 xid = get_xid();
Steve Frenchea4c07d2006-08-16 19:44:25 +0000324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 full_path = build_path_from_dentry(direntry);
Steve French79a58d12007-07-06 22:44:50 +0000326 if (full_path == NULL) {
Suresh Jayaraman0f3bc092009-06-25 18:12:34 +0530327 rc = -ENOMEM;
Jeff Layton7ffec372010-09-29 19:51:11 -0400328 goto list_ea_exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 }
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
Steve French79a58d12007-07-06 22:44:50 +0000334 search server for EAs or streams to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 returns as xattrs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
Steve French666753c2014-01-26 23:53:43 -0600337 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,
Steve French2baa2682014-09-27 02:19:01 -0500340 cifs_sb->local_nls, cifs_remap(cifs_sb));
Jeff Layton7ffec372010-09-29 19:51:11 -0400341list_ea_exit:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800342 kfree(full_path);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400343 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400344 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return rc;
346}
Andreas Gruenbachera9ae0082016-04-22 12:11:38 +0200347
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};