1 /*
2 * fs/cifs/ioctl.c
3 *
4 * vfs operations that deal with io control
5 *
6 * Copyright (C) International Business Machines Corp., 2005,2013
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include <linux/fs.h>
25 #include <linux/file.h>
26 #include <linux/mount.h>
27 #include <linux/mm.h>
28 #include <linux/pagemap.h>
29 #include "cifspdu.h"
30 #include "cifsglob.h"
31 #include "cifsproto.h"
32 #include "cifs_debug.h"
33 #include "cifsfs.h"
34 #include "cifs_ioctl.h"
35 #include "smb2proto.h"
36 #include <linux/btrfs.h>
37
cifs_ioctl_query_info(unsigned int xid,struct file * filep,unsigned long p)38 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
39 unsigned long p)
40 {
41 struct inode *inode = file_inode(filep);
42 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
43 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
44 struct dentry *dentry = filep->f_path.dentry;
45 const unsigned char *path;
46 void *page = alloc_dentry_path();
47 __le16 *utf16_path = NULL, root_path;
48 int rc = 0;
49
50 path = build_path_from_dentry(dentry, page);
51 if (IS_ERR(path)) {
52 free_dentry_path(page);
53 return PTR_ERR(path);
54 }
55
56 cifs_dbg(FYI, "%s %s\n", __func__, path);
57
58 if (!path[0]) {
59 root_path = 0;
60 utf16_path = &root_path;
61 } else {
62 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
63 if (!utf16_path) {
64 rc = -ENOMEM;
65 goto ici_exit;
66 }
67 }
68
69 if (tcon->ses->server->ops->ioctl_query_info)
70 rc = tcon->ses->server->ops->ioctl_query_info(
71 xid, tcon, cifs_sb, utf16_path,
72 filep->private_data ? 0 : 1, p);
73 else
74 rc = -EOPNOTSUPP;
75
76 ici_exit:
77 if (utf16_path != &root_path)
78 kfree(utf16_path);
79 free_dentry_path(page);
80 return rc;
81 }
82
cifs_ioctl_copychunk(unsigned int xid,struct file * dst_file,unsigned long srcfd)83 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
84 unsigned long srcfd)
85 {
86 int rc;
87 struct fd src_file;
88 struct inode *src_inode;
89
90 cifs_dbg(FYI, "ioctl copychunk range\n");
91 /* the destination must be opened for writing */
92 if (!(dst_file->f_mode & FMODE_WRITE)) {
93 cifs_dbg(FYI, "file target not open for write\n");
94 return -EINVAL;
95 }
96
97 /* check if target volume is readonly and take reference */
98 rc = mnt_want_write_file(dst_file);
99 if (rc) {
100 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
101 return rc;
102 }
103
104 src_file = fdget(srcfd);
105 if (!src_file.file) {
106 rc = -EBADF;
107 goto out_drop_write;
108 }
109
110 if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
111 rc = -EBADF;
112 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
113 goto out_fput;
114 }
115
116 src_inode = file_inode(src_file.file);
117 rc = -EINVAL;
118 if (S_ISDIR(src_inode->i_mode))
119 goto out_fput;
120
121 rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
122 src_inode->i_size, 0);
123 if (rc > 0)
124 rc = 0;
125 out_fput:
126 fdput(src_file);
127 out_drop_write:
128 mnt_drop_write_file(dst_file);
129 return rc;
130 }
131
smb_mnt_get_fsinfo(unsigned int xid,struct cifs_tcon * tcon,void __user * arg)132 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
133 void __user *arg)
134 {
135 int rc = 0;
136 struct smb_mnt_fs_info *fsinf;
137
138 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
139 if (fsinf == NULL)
140 return -ENOMEM;
141
142 fsinf->version = 1;
143 fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
144 fsinf->device_characteristics =
145 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
146 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
147 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
148 fsinf->max_path_component =
149 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
150 fsinf->vol_serial_number = tcon->vol_serial_number;
151 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
152 fsinf->share_flags = tcon->share_flags;
153 fsinf->share_caps = le32_to_cpu(tcon->capabilities);
154 fsinf->sector_flags = tcon->ss_flags;
155 fsinf->optimal_sector_size = tcon->perf_sector_size;
156 fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
157 fsinf->maximal_access = tcon->maximal_access;
158 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
159
160 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
161 rc = -EFAULT;
162
163 kfree(fsinf);
164 return rc;
165 }
166
cifs_shutdown(struct super_block * sb,unsigned long arg)167 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
168 {
169 struct cifs_sb_info *sbi = CIFS_SB(sb);
170 __u32 flags;
171
172 if (!capable(CAP_SYS_ADMIN))
173 return -EPERM;
174
175 if (get_user(flags, (__u32 __user *)arg))
176 return -EFAULT;
177
178 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
179 return -EINVAL;
180
181 if (cifs_forced_shutdown(sbi))
182 return 0;
183
184 cifs_dbg(VFS, "shut down requested (%d)", flags);
185 /* trace_cifs_shutdown(sb, flags);*/
186
187 /*
188 * see:
189 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
190 * for more information and description of original intent of the flags
191 */
192 switch (flags) {
193 /*
194 * We could add support later for default flag which requires:
195 * "Flush all dirty data and metadata to disk"
196 * would need to call syncfs or equivalent to flush page cache for
197 * the mount and then issue fsync to server (if nostrictsync not set)
198 */
199 case CIFS_GOING_FLAGS_DEFAULT:
200 cifs_dbg(FYI, "shutdown with default flag not supported\n");
201 return -EINVAL;
202 /*
203 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
204 * data) but metadata writes are not cached on the client, so can treat
205 * it similarly to NOLOGFLUSH
206 */
207 case CIFS_GOING_FLAGS_LOGFLUSH:
208 case CIFS_GOING_FLAGS_NOLOGFLUSH:
209 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
210 return 0;
211 default:
212 return -EINVAL;
213 }
214 return 0;
215 }
216
cifs_dump_full_key(struct cifs_tcon * tcon,unsigned long arg)217 static int cifs_dump_full_key(struct cifs_tcon *tcon, unsigned long arg)
218 {
219 struct smb3_full_key_debug_info pfull_key_inf;
220 __u64 suid;
221 struct list_head *tmp;
222 struct cifs_ses *ses;
223 bool found = false;
224
225 if (!smb3_encryption_required(tcon))
226 return -EOPNOTSUPP;
227
228 ses = tcon->ses; /* default to user id for current user */
229 if (get_user(suid, (__u64 __user *)arg))
230 suid = 0;
231 if (suid) {
232 /* search to see if there is a session with a matching SMB UID */
233 spin_lock(&cifs_tcp_ses_lock);
234 list_for_each(tmp, &tcon->ses->server->smb_ses_list) {
235 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
236 if (ses->Suid == suid) {
237 found = true;
238 break;
239 }
240 }
241 spin_unlock(&cifs_tcp_ses_lock);
242 if (found == false)
243 return -EINVAL;
244 } /* else uses default user's SMB UID (ie current user) */
245
246 pfull_key_inf.cipher_type = le16_to_cpu(ses->server->cipher_type);
247 pfull_key_inf.Suid = ses->Suid;
248 memcpy(pfull_key_inf.auth_key, ses->auth_key.response,
249 16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
250 memcpy(pfull_key_inf.smb3decryptionkey, ses->smb3decryptionkey,
251 32 /* SMB3_ENC_DEC_KEY_SIZE */);
252 memcpy(pfull_key_inf.smb3encryptionkey,
253 ses->smb3encryptionkey, 32 /* SMB3_ENC_DEC_KEY_SIZE */);
254 if (copy_to_user((void __user *)arg, &pfull_key_inf,
255 sizeof(struct smb3_full_key_debug_info)))
256 return -EFAULT;
257
258 return 0;
259 }
260
cifs_ioctl(struct file * filep,unsigned int command,unsigned long arg)261 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
262 {
263 struct inode *inode = file_inode(filep);
264 struct smb3_key_debug_info pkey_inf;
265 int rc = -ENOTTY; /* strange error - but the precedent */
266 unsigned int xid;
267 struct cifsFileInfo *pSMBFile = filep->private_data;
268 struct cifs_tcon *tcon;
269 struct tcon_link *tlink;
270 struct cifs_sb_info *cifs_sb;
271 __u64 ExtAttrBits = 0;
272 __u64 caps;
273
274 xid = get_xid();
275
276 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
277 switch (command) {
278 case FS_IOC_GETFLAGS:
279 if (pSMBFile == NULL)
280 break;
281 tcon = tlink_tcon(pSMBFile->tlink);
282 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
283 #ifdef CONFIG_CIFS_POSIX
284 if (CIFS_UNIX_EXTATTR_CAP & caps) {
285 __u64 ExtAttrMask = 0;
286 rc = CIFSGetExtAttr(xid, tcon,
287 pSMBFile->fid.netfid,
288 &ExtAttrBits, &ExtAttrMask);
289 if (rc == 0)
290 rc = put_user(ExtAttrBits &
291 FS_FL_USER_VISIBLE,
292 (int __user *)arg);
293 if (rc != EOPNOTSUPP)
294 break;
295 }
296 #endif /* CONFIG_CIFS_POSIX */
297 rc = 0;
298 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
299 /* add in the compressed bit */
300 ExtAttrBits = FS_COMPR_FL;
301 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
302 (int __user *)arg);
303 }
304 break;
305 case FS_IOC_SETFLAGS:
306 if (pSMBFile == NULL)
307 break;
308 tcon = tlink_tcon(pSMBFile->tlink);
309 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
310
311 if (get_user(ExtAttrBits, (int __user *)arg)) {
312 rc = -EFAULT;
313 break;
314 }
315
316 /*
317 * if (CIFS_UNIX_EXTATTR_CAP & caps)
318 * rc = CIFSSetExtAttr(xid, tcon,
319 * pSMBFile->fid.netfid,
320 * extAttrBits,
321 * &ExtAttrMask);
322 * if (rc != EOPNOTSUPP)
323 * break;
324 */
325
326 /* Currently only flag we can set is compressed flag */
327 if ((ExtAttrBits & FS_COMPR_FL) == 0)
328 break;
329
330 /* Try to set compress flag */
331 if (tcon->ses->server->ops->set_compression) {
332 rc = tcon->ses->server->ops->set_compression(
333 xid, tcon, pSMBFile);
334 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
335 }
336 break;
337 case CIFS_IOC_COPYCHUNK_FILE:
338 rc = cifs_ioctl_copychunk(xid, filep, arg);
339 break;
340 case CIFS_QUERY_INFO:
341 rc = cifs_ioctl_query_info(xid, filep, arg);
342 break;
343 case CIFS_IOC_SET_INTEGRITY:
344 if (pSMBFile == NULL)
345 break;
346 tcon = tlink_tcon(pSMBFile->tlink);
347 if (tcon->ses->server->ops->set_integrity)
348 rc = tcon->ses->server->ops->set_integrity(xid,
349 tcon, pSMBFile);
350 else
351 rc = -EOPNOTSUPP;
352 break;
353 case CIFS_IOC_GET_MNT_INFO:
354 if (pSMBFile == NULL)
355 break;
356 tcon = tlink_tcon(pSMBFile->tlink);
357 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
358 break;
359 case CIFS_ENUMERATE_SNAPSHOTS:
360 if (pSMBFile == NULL)
361 break;
362 if (arg == 0) {
363 rc = -EINVAL;
364 goto cifs_ioc_exit;
365 }
366 tcon = tlink_tcon(pSMBFile->tlink);
367 if (tcon->ses->server->ops->enum_snapshots)
368 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
369 pSMBFile, (void __user *)arg);
370 else
371 rc = -EOPNOTSUPP;
372 break;
373 case CIFS_DUMP_KEY:
374 if (pSMBFile == NULL)
375 break;
376 if (!capable(CAP_SYS_ADMIN)) {
377 rc = -EACCES;
378 break;
379 }
380
381 tcon = tlink_tcon(pSMBFile->tlink);
382 if (!smb3_encryption_required(tcon)) {
383 rc = -EOPNOTSUPP;
384 break;
385 }
386 pkey_inf.cipher_type =
387 le16_to_cpu(tcon->ses->server->cipher_type);
388 pkey_inf.Suid = tcon->ses->Suid;
389 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
390 16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
391 memcpy(pkey_inf.smb3decryptionkey,
392 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
393 memcpy(pkey_inf.smb3encryptionkey,
394 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
395 if (copy_to_user((void __user *)arg, &pkey_inf,
396 sizeof(struct smb3_key_debug_info)))
397 rc = -EFAULT;
398 else
399 rc = 0;
400 break;
401 /*
402 * Dump full key (32 bytes instead of 16 bytes) is
403 * needed if GCM256 (stronger encryption) negotiated
404 */
405 case CIFS_DUMP_FULL_KEY:
406 if (pSMBFile == NULL)
407 break;
408 if (!capable(CAP_SYS_ADMIN)) {
409 rc = -EACCES;
410 break;
411 }
412 tcon = tlink_tcon(pSMBFile->tlink);
413 rc = cifs_dump_full_key(tcon, arg);
414
415 break;
416 case CIFS_IOC_NOTIFY:
417 if (!S_ISDIR(inode->i_mode)) {
418 /* Notify can only be done on directories */
419 rc = -EOPNOTSUPP;
420 break;
421 }
422 cifs_sb = CIFS_SB(inode->i_sb);
423 tlink = cifs_sb_tlink(cifs_sb);
424 if (IS_ERR(tlink)) {
425 rc = PTR_ERR(tlink);
426 break;
427 }
428 tcon = tlink_tcon(tlink);
429 if (tcon && tcon->ses->server->ops->notify) {
430 rc = tcon->ses->server->ops->notify(xid,
431 filep, (void __user *)arg);
432 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
433 } else
434 rc = -EOPNOTSUPP;
435 cifs_put_tlink(tlink);
436 break;
437 case CIFS_IOC_SHUTDOWN:
438 rc = cifs_shutdown(inode->i_sb, arg);
439 break;
440 default:
441 cifs_dbg(FYI, "unsupported ioctl\n");
442 break;
443 }
444 cifs_ioc_exit:
445 free_xid(xid);
446 return rc;
447 }
448