1 // SPDX-License-Identifier: LGPL-2.1
2 /*
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 */
10
11 #include <linux/fs.h>
12 #include <linux/file.h>
13 #include <linux/mount.h>
14 #include <linux/mm.h>
15 #include <linux/pagemap.h>
16 #include "cifspdu.h"
17 #include "cifsglob.h"
18 #include "cifsproto.h"
19 #include "cifs_debug.h"
20 #include "cifsfs.h"
21 #include "cifs_ioctl.h"
22 #include "smb2proto.h"
23 #include "smb2glob.h"
24 #include <linux/btrfs.h>
25
cifs_ioctl_query_info(unsigned int xid,struct file * filep,unsigned long p)26 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
27 unsigned long p)
28 {
29 struct inode *inode = file_inode(filep);
30 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
31 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
32 struct dentry *dentry = filep->f_path.dentry;
33 const unsigned char *path;
34 void *page = alloc_dentry_path();
35 __le16 *utf16_path = NULL, root_path;
36 int rc = 0;
37
38 path = build_path_from_dentry(dentry, page);
39 if (IS_ERR(path)) {
40 free_dentry_path(page);
41 return PTR_ERR(path);
42 }
43
44 cifs_dbg(FYI, "%s %s\n", __func__, path);
45
46 if (!path[0]) {
47 root_path = 0;
48 utf16_path = &root_path;
49 } else {
50 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
51 if (!utf16_path) {
52 rc = -ENOMEM;
53 goto ici_exit;
54 }
55 }
56
57 if (tcon->ses->server->ops->ioctl_query_info)
58 rc = tcon->ses->server->ops->ioctl_query_info(
59 xid, tcon, cifs_sb, utf16_path,
60 filep->private_data ? 0 : 1, p);
61 else
62 rc = -EOPNOTSUPP;
63
64 ici_exit:
65 if (utf16_path != &root_path)
66 kfree(utf16_path);
67 free_dentry_path(page);
68 return rc;
69 }
70
cifs_ioctl_copychunk(unsigned int xid,struct file * dst_file,unsigned long srcfd)71 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
72 unsigned long srcfd)
73 {
74 int rc;
75 struct fd src_file;
76 struct inode *src_inode;
77
78 cifs_dbg(FYI, "ioctl copychunk range\n");
79 /* the destination must be opened for writing */
80 if (!(dst_file->f_mode & FMODE_WRITE)) {
81 cifs_dbg(FYI, "file target not open for write\n");
82 return -EINVAL;
83 }
84
85 /* check if target volume is readonly and take reference */
86 rc = mnt_want_write_file(dst_file);
87 if (rc) {
88 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
89 return rc;
90 }
91
92 src_file = fdget(srcfd);
93 if (!src_file.file) {
94 rc = -EBADF;
95 goto out_drop_write;
96 }
97
98 if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
99 rc = -EBADF;
100 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
101 goto out_fput;
102 }
103
104 src_inode = file_inode(src_file.file);
105 rc = -EINVAL;
106 if (S_ISDIR(src_inode->i_mode))
107 goto out_fput;
108
109 rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
110 src_inode->i_size, 0);
111 if (rc > 0)
112 rc = 0;
113 out_fput:
114 fdput(src_file);
115 out_drop_write:
116 mnt_drop_write_file(dst_file);
117 return rc;
118 }
119
smb_mnt_get_tcon_info(struct cifs_tcon * tcon,void __user * arg)120 static long smb_mnt_get_tcon_info(struct cifs_tcon *tcon, void __user *arg)
121 {
122 int rc = 0;
123 struct smb_mnt_tcon_info tcon_inf;
124
125 tcon_inf.tid = tcon->tid;
126 tcon_inf.session_id = tcon->ses->Suid;
127
128 if (copy_to_user(arg, &tcon_inf, sizeof(struct smb_mnt_tcon_info)))
129 rc = -EFAULT;
130
131 return rc;
132 }
133
smb_mnt_get_fsinfo(unsigned int xid,struct cifs_tcon * tcon,void __user * arg)134 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
135 void __user *arg)
136 {
137 int rc = 0;
138 struct smb_mnt_fs_info *fsinf;
139
140 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
141 if (fsinf == NULL)
142 return -ENOMEM;
143
144 fsinf->version = 1;
145 fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
146 fsinf->tcon_flags = tcon->Flags;
147 fsinf->device_characteristics =
148 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
149 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
150 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
151 fsinf->max_path_component =
152 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
153 fsinf->vol_serial_number = tcon->vol_serial_number;
154 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
155 fsinf->share_flags = tcon->share_flags;
156 fsinf->share_caps = le32_to_cpu(tcon->capabilities);
157 fsinf->sector_flags = tcon->ss_flags;
158 fsinf->optimal_sector_size = tcon->perf_sector_size;
159 fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
160 fsinf->maximal_access = tcon->maximal_access;
161 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
162
163 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
164 rc = -EFAULT;
165
166 kfree(fsinf);
167 return rc;
168 }
169
cifs_shutdown(struct super_block * sb,unsigned long arg)170 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
171 {
172 struct cifs_sb_info *sbi = CIFS_SB(sb);
173 __u32 flags;
174
175 if (!capable(CAP_SYS_ADMIN))
176 return -EPERM;
177
178 if (get_user(flags, (__u32 __user *)arg))
179 return -EFAULT;
180
181 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
182 return -EINVAL;
183
184 if (cifs_forced_shutdown(sbi))
185 return 0;
186
187 cifs_dbg(VFS, "shut down requested (%d)", flags);
188 /* trace_cifs_shutdown(sb, flags);*/
189
190 /*
191 * see:
192 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
193 * for more information and description of original intent of the flags
194 */
195 switch (flags) {
196 /*
197 * We could add support later for default flag which requires:
198 * "Flush all dirty data and metadata to disk"
199 * would need to call syncfs or equivalent to flush page cache for
200 * the mount and then issue fsync to server (if nostrictsync not set)
201 */
202 case CIFS_GOING_FLAGS_DEFAULT:
203 cifs_dbg(FYI, "shutdown with default flag not supported\n");
204 return -EINVAL;
205 /*
206 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
207 * data) but metadata writes are not cached on the client, so can treat
208 * it similarly to NOLOGFLUSH
209 */
210 case CIFS_GOING_FLAGS_LOGFLUSH:
211 case CIFS_GOING_FLAGS_NOLOGFLUSH:
212 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
213 return 0;
214 default:
215 return -EINVAL;
216 }
217 return 0;
218 }
219
cifs_dump_full_key(struct cifs_tcon * tcon,struct smb3_full_key_debug_info __user * in)220 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
221 {
222 struct smb3_full_key_debug_info out;
223 struct cifs_ses *ses;
224 int rc = 0;
225 bool found = false;
226 u8 __user *end;
227
228 if (!smb3_encryption_required(tcon)) {
229 rc = -EOPNOTSUPP;
230 goto out;
231 }
232
233 /* copy user input into our output buffer */
234 if (copy_from_user(&out, in, sizeof(out))) {
235 rc = -EINVAL;
236 goto out;
237 }
238
239 if (!out.session_id) {
240 /* if ses id is 0, use current user session */
241 ses = tcon->ses;
242 } else {
243 /* otherwise if a session id is given, look for it in all our sessions */
244 struct cifs_ses *ses_it = NULL;
245 struct TCP_Server_Info *server_it = NULL;
246
247 spin_lock(&cifs_tcp_ses_lock);
248 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
249 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
250 spin_lock(&ses_it->ses_lock);
251 if (ses_it->ses_status != SES_EXITING &&
252 ses_it->Suid == out.session_id) {
253 ses = ses_it;
254 /*
255 * since we are using the session outside the crit
256 * section, we need to make sure it won't be released
257 * so increment its refcount
258 */
259 cifs_smb_ses_inc_refcount(ses);
260 spin_unlock(&ses_it->ses_lock);
261 found = true;
262 goto search_end;
263 }
264 spin_unlock(&ses_it->ses_lock);
265 }
266 }
267 search_end:
268 spin_unlock(&cifs_tcp_ses_lock);
269 if (!found) {
270 rc = -ENOENT;
271 goto out;
272 }
273 }
274
275 switch (ses->server->cipher_type) {
276 case SMB2_ENCRYPTION_AES128_CCM:
277 case SMB2_ENCRYPTION_AES128_GCM:
278 out.session_key_length = CIFS_SESS_KEY_SIZE;
279 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
280 break;
281 case SMB2_ENCRYPTION_AES256_CCM:
282 case SMB2_ENCRYPTION_AES256_GCM:
283 out.session_key_length = CIFS_SESS_KEY_SIZE;
284 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
285 break;
286 default:
287 rc = -EOPNOTSUPP;
288 goto out;
289 }
290
291 /* check if user buffer is big enough to store all the keys */
292 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
293 + out.server_out_key_length) {
294 rc = -ENOBUFS;
295 goto out;
296 }
297
298 out.session_id = ses->Suid;
299 out.cipher_type = le16_to_cpu(ses->server->cipher_type);
300
301 /* overwrite user input with our output */
302 if (copy_to_user(in, &out, sizeof(out))) {
303 rc = -EINVAL;
304 goto out;
305 }
306
307 /* append all the keys at the end of the user buffer */
308 end = in->data;
309 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
310 rc = -EINVAL;
311 goto out;
312 }
313 end += out.session_key_length;
314
315 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
316 rc = -EINVAL;
317 goto out;
318 }
319 end += out.server_in_key_length;
320
321 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
322 rc = -EINVAL;
323 goto out;
324 }
325
326 out:
327 if (found)
328 cifs_put_smb_ses(ses);
329 return rc;
330 }
331
cifs_ioctl(struct file * filep,unsigned int command,unsigned long arg)332 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
333 {
334 struct inode *inode = file_inode(filep);
335 struct smb3_key_debug_info pkey_inf;
336 int rc = -ENOTTY; /* strange error - but the precedent */
337 unsigned int xid;
338 struct cifsFileInfo *pSMBFile = filep->private_data;
339 struct cifs_tcon *tcon;
340 struct tcon_link *tlink;
341 struct cifs_sb_info *cifs_sb;
342 __u64 ExtAttrBits = 0;
343 #ifdef CONFIG_CIFS_POSIX
344 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
345 __u64 caps;
346 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
347 #endif /* CONFIG_CIFS_POSIX */
348
349 xid = get_xid();
350
351 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
352 if (pSMBFile == NULL)
353 trace_smb3_ioctl(xid, 0, command);
354 else
355 trace_smb3_ioctl(xid, pSMBFile->fid.persistent_fid, command);
356
357 switch (command) {
358 case FS_IOC_GETFLAGS:
359 if (pSMBFile == NULL)
360 break;
361 tcon = tlink_tcon(pSMBFile->tlink);
362 #ifdef CONFIG_CIFS_POSIX
363 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
364 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
365 if (CIFS_UNIX_EXTATTR_CAP & caps) {
366 __u64 ExtAttrMask = 0;
367 rc = CIFSGetExtAttr(xid, tcon,
368 pSMBFile->fid.netfid,
369 &ExtAttrBits, &ExtAttrMask);
370 if (rc == 0)
371 rc = put_user(ExtAttrBits &
372 FS_FL_USER_VISIBLE,
373 (int __user *)arg);
374 if (rc != -EOPNOTSUPP)
375 break;
376 }
377 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
378 #endif /* CONFIG_CIFS_POSIX */
379 rc = 0;
380 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
381 /* add in the compressed bit */
382 ExtAttrBits = FS_COMPR_FL;
383 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
384 (int __user *)arg);
385 }
386 break;
387 case FS_IOC_SETFLAGS:
388 if (pSMBFile == NULL)
389 break;
390 tcon = tlink_tcon(pSMBFile->tlink);
391 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */
392
393 if (get_user(ExtAttrBits, (int __user *)arg)) {
394 rc = -EFAULT;
395 break;
396 }
397
398 /*
399 * if (CIFS_UNIX_EXTATTR_CAP & caps)
400 * rc = CIFSSetExtAttr(xid, tcon,
401 * pSMBFile->fid.netfid,
402 * extAttrBits,
403 * &ExtAttrMask);
404 * if (rc != -EOPNOTSUPP)
405 * break;
406 */
407
408 /* Currently only flag we can set is compressed flag */
409 if ((ExtAttrBits & FS_COMPR_FL) == 0)
410 break;
411
412 /* Try to set compress flag */
413 if (tcon->ses->server->ops->set_compression) {
414 rc = tcon->ses->server->ops->set_compression(
415 xid, tcon, pSMBFile);
416 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
417 }
418 break;
419 case CIFS_IOC_COPYCHUNK_FILE:
420 rc = cifs_ioctl_copychunk(xid, filep, arg);
421 break;
422 case CIFS_QUERY_INFO:
423 rc = cifs_ioctl_query_info(xid, filep, arg);
424 break;
425 case CIFS_IOC_SET_INTEGRITY:
426 if (pSMBFile == NULL)
427 break;
428 tcon = tlink_tcon(pSMBFile->tlink);
429 if (tcon->ses->server->ops->set_integrity)
430 rc = tcon->ses->server->ops->set_integrity(xid,
431 tcon, pSMBFile);
432 else
433 rc = -EOPNOTSUPP;
434 break;
435 case CIFS_IOC_GET_MNT_INFO:
436 if (pSMBFile == NULL)
437 break;
438 tcon = tlink_tcon(pSMBFile->tlink);
439 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
440 break;
441 case CIFS_IOC_GET_TCON_INFO:
442 cifs_sb = CIFS_SB(inode->i_sb);
443 tlink = cifs_sb_tlink(cifs_sb);
444 if (IS_ERR(tlink)) {
445 rc = PTR_ERR(tlink);
446 break;
447 }
448 tcon = tlink_tcon(tlink);
449 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg);
450 cifs_put_tlink(tlink);
451 break;
452 case CIFS_ENUMERATE_SNAPSHOTS:
453 if (pSMBFile == NULL)
454 break;
455 if (arg == 0) {
456 rc = -EINVAL;
457 goto cifs_ioc_exit;
458 }
459 tcon = tlink_tcon(pSMBFile->tlink);
460 if (tcon->ses->server->ops->enum_snapshots)
461 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
462 pSMBFile, (void __user *)arg);
463 else
464 rc = -EOPNOTSUPP;
465 break;
466 case CIFS_DUMP_KEY:
467 /*
468 * Dump encryption keys. This is an old ioctl that only
469 * handles AES-128-{CCM,GCM}.
470 */
471 if (!capable(CAP_SYS_ADMIN)) {
472 rc = -EACCES;
473 break;
474 }
475
476 cifs_sb = CIFS_SB(inode->i_sb);
477 tlink = cifs_sb_tlink(cifs_sb);
478 if (IS_ERR(tlink)) {
479 rc = PTR_ERR(tlink);
480 break;
481 }
482 tcon = tlink_tcon(tlink);
483 if (!smb3_encryption_required(tcon)) {
484 rc = -EOPNOTSUPP;
485 cifs_put_tlink(tlink);
486 break;
487 }
488 pkey_inf.cipher_type =
489 le16_to_cpu(tcon->ses->server->cipher_type);
490 pkey_inf.Suid = tcon->ses->Suid;
491 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
492 16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
493 memcpy(pkey_inf.smb3decryptionkey,
494 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
495 memcpy(pkey_inf.smb3encryptionkey,
496 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
497 if (copy_to_user((void __user *)arg, &pkey_inf,
498 sizeof(struct smb3_key_debug_info)))
499 rc = -EFAULT;
500 else
501 rc = 0;
502 cifs_put_tlink(tlink);
503 break;
504 case CIFS_DUMP_FULL_KEY:
505 /*
506 * Dump encryption keys (handles any key sizes)
507 */
508 if (pSMBFile == NULL)
509 break;
510 if (!capable(CAP_SYS_ADMIN)) {
511 rc = -EACCES;
512 break;
513 }
514 cifs_sb = CIFS_SB(inode->i_sb);
515 tlink = cifs_sb_tlink(cifs_sb);
516 if (IS_ERR(tlink)) {
517 rc = PTR_ERR(tlink);
518 break;
519 }
520
521 tcon = tlink_tcon(tlink);
522 rc = cifs_dump_full_key(tcon, (void __user *)arg);
523 cifs_put_tlink(tlink);
524 break;
525 case CIFS_IOC_NOTIFY:
526 if (!S_ISDIR(inode->i_mode)) {
527 /* Notify can only be done on directories */
528 rc = -EOPNOTSUPP;
529 break;
530 }
531 cifs_sb = CIFS_SB(inode->i_sb);
532 tlink = cifs_sb_tlink(cifs_sb);
533 if (IS_ERR(tlink)) {
534 rc = PTR_ERR(tlink);
535 break;
536 }
537 tcon = tlink_tcon(tlink);
538 if (tcon && tcon->ses->server->ops->notify) {
539 rc = tcon->ses->server->ops->notify(xid,
540 filep, (void __user *)arg,
541 false /* no ret data */);
542 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
543 } else
544 rc = -EOPNOTSUPP;
545 cifs_put_tlink(tlink);
546 break;
547 case CIFS_IOC_NOTIFY_INFO:
548 if (!S_ISDIR(inode->i_mode)) {
549 /* Notify can only be done on directories */
550 rc = -EOPNOTSUPP;
551 break;
552 }
553 cifs_sb = CIFS_SB(inode->i_sb);
554 tlink = cifs_sb_tlink(cifs_sb);
555 if (IS_ERR(tlink)) {
556 rc = PTR_ERR(tlink);
557 break;
558 }
559 tcon = tlink_tcon(tlink);
560 if (tcon && tcon->ses->server->ops->notify) {
561 rc = tcon->ses->server->ops->notify(xid,
562 filep, (void __user *)arg,
563 true /* return details */);
564 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc);
565 } else
566 rc = -EOPNOTSUPP;
567 cifs_put_tlink(tlink);
568 break;
569 case CIFS_IOC_SHUTDOWN:
570 rc = cifs_shutdown(inode->i_sb, arg);
571 break;
572 default:
573 cifs_dbg(FYI, "unsupported ioctl\n");
574 break;
575 }
576 cifs_ioc_exit:
577 free_xid(xid);
578 return rc;
579 }
580