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 (!fd_file(src_file)) {
94 rc = -EBADF;
95 goto out_drop_write;
96 }
97
98 if (fd_file(src_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(fd_file(src_file));
105 rc = -EINVAL;
106 if (S_ISDIR(src_inode->i_mode))
107 goto out_fput;
108
109 rc = cifs_file_copychunk_range(xid, fd_file(src_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 struct tcon_link *tlink;
174 struct cifs_tcon *tcon;
175 __u32 flags;
176 int rc;
177
178 if (!capable(CAP_SYS_ADMIN))
179 return -EPERM;
180
181 if (get_user(flags, (__u32 __user *)arg))
182 return -EFAULT;
183
184 tlink = cifs_sb_tlink(sbi);
185 if (IS_ERR(tlink))
186 return PTR_ERR(tlink);
187 tcon = tlink_tcon(tlink);
188
189 trace_smb3_shutdown_enter(flags, tcon->tid);
190 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) {
191 rc = -EINVAL;
192 goto shutdown_out_err;
193 }
194
195 if (cifs_forced_shutdown(sbi))
196 goto shutdown_good;
197
198 cifs_dbg(VFS, "shut down requested (%d)", flags);
199
200 /*
201 * see:
202 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
203 * for more information and description of original intent of the flags
204 */
205 switch (flags) {
206 /*
207 * We could add support later for default flag which requires:
208 * "Flush all dirty data and metadata to disk"
209 * would need to call syncfs or equivalent to flush page cache for
210 * the mount and then issue fsync to server (if nostrictsync not set)
211 */
212 case CIFS_GOING_FLAGS_DEFAULT:
213 cifs_dbg(FYI, "shutdown with default flag not supported\n");
214 rc = -EINVAL;
215 goto shutdown_out_err;
216 /*
217 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
218 * data) but metadata writes are not cached on the client, so can treat
219 * it similarly to NOLOGFLUSH
220 */
221 case CIFS_GOING_FLAGS_LOGFLUSH:
222 case CIFS_GOING_FLAGS_NOLOGFLUSH:
223 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
224 goto shutdown_good;
225 default:
226 rc = -EINVAL;
227 goto shutdown_out_err;
228 }
229
230 shutdown_good:
231 trace_smb3_shutdown_done(flags, tcon->tid);
232 cifs_put_tlink(tlink);
233 return 0;
234 shutdown_out_err:
235 trace_smb3_shutdown_err(rc, flags, tcon->tid);
236 cifs_put_tlink(tlink);
237 return rc;
238 }
239
cifs_dump_full_key(struct cifs_tcon * tcon,struct smb3_full_key_debug_info __user * in)240 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
241 {
242 struct smb3_full_key_debug_info out;
243 struct cifs_ses *ses;
244 int rc = 0;
245 bool found = false;
246 u8 __user *end;
247
248 if (!smb3_encryption_required(tcon)) {
249 rc = -EOPNOTSUPP;
250 goto out;
251 }
252
253 /* copy user input into our output buffer */
254 if (copy_from_user(&out, in, sizeof(out))) {
255 rc = -EINVAL;
256 goto out;
257 }
258
259 if (!out.session_id) {
260 /* if ses id is 0, use current user session */
261 ses = tcon->ses;
262 } else {
263 /* otherwise if a session id is given, look for it in all our sessions */
264 struct cifs_ses *ses_it = NULL;
265 struct TCP_Server_Info *server_it = NULL;
266
267 spin_lock(&cifs_tcp_ses_lock);
268 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
269 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
270 spin_lock(&ses_it->ses_lock);
271 if (ses_it->ses_status != SES_EXITING &&
272 ses_it->Suid == out.session_id) {
273 ses = ses_it;
274 /*
275 * since we are using the session outside the crit
276 * section, we need to make sure it won't be released
277 * so increment its refcount
278 */
279 cifs_smb_ses_inc_refcount(ses);
280 spin_unlock(&ses_it->ses_lock);
281 found = true;
282 goto search_end;
283 }
284 spin_unlock(&ses_it->ses_lock);
285 }
286 }
287 search_end:
288 spin_unlock(&cifs_tcp_ses_lock);
289 if (!found) {
290 rc = -ENOENT;
291 goto out;
292 }
293 }
294
295 switch (ses->server->cipher_type) {
296 case SMB2_ENCRYPTION_AES128_CCM:
297 case SMB2_ENCRYPTION_AES128_GCM:
298 out.session_key_length = CIFS_SESS_KEY_SIZE;
299 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
300 break;
301 case SMB2_ENCRYPTION_AES256_CCM:
302 case SMB2_ENCRYPTION_AES256_GCM:
303 out.session_key_length = CIFS_SESS_KEY_SIZE;
304 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
305 break;
306 default:
307 rc = -EOPNOTSUPP;
308 goto out;
309 }
310
311 /* check if user buffer is big enough to store all the keys */
312 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
313 + out.server_out_key_length) {
314 rc = -ENOBUFS;
315 goto out;
316 }
317
318 out.session_id = ses->Suid;
319 out.cipher_type = le16_to_cpu(ses->server->cipher_type);
320
321 /* overwrite user input with our output */
322 if (copy_to_user(in, &out, sizeof(out))) {
323 rc = -EINVAL;
324 goto out;
325 }
326
327 /* append all the keys at the end of the user buffer */
328 end = in->data;
329 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
330 rc = -EINVAL;
331 goto out;
332 }
333 end += out.session_key_length;
334
335 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
336 rc = -EINVAL;
337 goto out;
338 }
339 end += out.server_in_key_length;
340
341 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
342 rc = -EINVAL;
343 goto out;
344 }
345
346 out:
347 if (found)
348 cifs_put_smb_ses(ses);
349 return rc;
350 }
351
cifs_ioctl(struct file * filep,unsigned int command,unsigned long arg)352 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
353 {
354 struct inode *inode = file_inode(filep);
355 struct smb3_key_debug_info pkey_inf;
356 int rc = -ENOTTY; /* strange error - but the precedent */
357 unsigned int xid;
358 struct cifsFileInfo *pSMBFile = filep->private_data;
359 struct cifs_tcon *tcon;
360 struct tcon_link *tlink;
361 struct cifs_sb_info *cifs_sb;
362 __u64 ExtAttrBits = 0;
363 #ifdef CONFIG_CIFS_POSIX
364 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
365 __u64 caps;
366 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
367 #endif /* CONFIG_CIFS_POSIX */
368
369 xid = get_xid();
370
371 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
372 if (pSMBFile == NULL)
373 trace_smb3_ioctl(xid, 0, command);
374 else
375 trace_smb3_ioctl(xid, pSMBFile->fid.persistent_fid, command);
376
377 switch (command) {
378 case FS_IOC_GETFLAGS:
379 if (pSMBFile == NULL)
380 break;
381 tcon = tlink_tcon(pSMBFile->tlink);
382 #ifdef CONFIG_CIFS_POSIX
383 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
384 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
385 if (CIFS_UNIX_EXTATTR_CAP & caps) {
386 __u64 ExtAttrMask = 0;
387 rc = CIFSGetExtAttr(xid, tcon,
388 pSMBFile->fid.netfid,
389 &ExtAttrBits, &ExtAttrMask);
390 if (rc == 0)
391 rc = put_user(ExtAttrBits &
392 FS_FL_USER_VISIBLE,
393 (int __user *)arg);
394 if (rc != -EOPNOTSUPP)
395 break;
396 }
397 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
398 #endif /* CONFIG_CIFS_POSIX */
399 rc = 0;
400 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
401 /* add in the compressed bit */
402 ExtAttrBits = FS_COMPR_FL;
403 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
404 (int __user *)arg);
405 }
406 break;
407 case FS_IOC_SETFLAGS:
408 if (pSMBFile == NULL)
409 break;
410 tcon = tlink_tcon(pSMBFile->tlink);
411 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */
412
413 if (get_user(ExtAttrBits, (int __user *)arg)) {
414 rc = -EFAULT;
415 break;
416 }
417
418 /*
419 * if (CIFS_UNIX_EXTATTR_CAP & caps)
420 * rc = CIFSSetExtAttr(xid, tcon,
421 * pSMBFile->fid.netfid,
422 * extAttrBits,
423 * &ExtAttrMask);
424 * if (rc != -EOPNOTSUPP)
425 * break;
426 */
427
428 /* Currently only flag we can set is compressed flag */
429 if ((ExtAttrBits & FS_COMPR_FL) == 0)
430 break;
431
432 /* Try to set compress flag */
433 if (tcon->ses->server->ops->set_compression) {
434 rc = tcon->ses->server->ops->set_compression(
435 xid, tcon, pSMBFile);
436 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
437 }
438 break;
439 case CIFS_IOC_COPYCHUNK_FILE:
440 rc = cifs_ioctl_copychunk(xid, filep, arg);
441 break;
442 case CIFS_QUERY_INFO:
443 rc = cifs_ioctl_query_info(xid, filep, arg);
444 break;
445 case CIFS_IOC_SET_INTEGRITY:
446 if (pSMBFile == NULL)
447 break;
448 tcon = tlink_tcon(pSMBFile->tlink);
449 if (tcon->ses->server->ops->set_integrity)
450 rc = tcon->ses->server->ops->set_integrity(xid,
451 tcon, pSMBFile);
452 else
453 rc = -EOPNOTSUPP;
454 break;
455 case CIFS_IOC_GET_MNT_INFO:
456 if (pSMBFile == NULL)
457 break;
458 tcon = tlink_tcon(pSMBFile->tlink);
459 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
460 break;
461 case CIFS_IOC_GET_TCON_INFO:
462 cifs_sb = CIFS_SB(inode->i_sb);
463 tlink = cifs_sb_tlink(cifs_sb);
464 if (IS_ERR(tlink)) {
465 rc = PTR_ERR(tlink);
466 break;
467 }
468 tcon = tlink_tcon(tlink);
469 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg);
470 cifs_put_tlink(tlink);
471 break;
472 case CIFS_ENUMERATE_SNAPSHOTS:
473 if (pSMBFile == NULL)
474 break;
475 if (arg == 0) {
476 rc = -EINVAL;
477 goto cifs_ioc_exit;
478 }
479 tcon = tlink_tcon(pSMBFile->tlink);
480 if (tcon->ses->server->ops->enum_snapshots)
481 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
482 pSMBFile, (void __user *)arg);
483 else
484 rc = -EOPNOTSUPP;
485 break;
486 case CIFS_DUMP_KEY:
487 /*
488 * Dump encryption keys. This is an old ioctl that only
489 * handles AES-128-{CCM,GCM}.
490 */
491 if (!capable(CAP_SYS_ADMIN)) {
492 rc = -EACCES;
493 break;
494 }
495
496 cifs_sb = CIFS_SB(inode->i_sb);
497 tlink = cifs_sb_tlink(cifs_sb);
498 if (IS_ERR(tlink)) {
499 rc = PTR_ERR(tlink);
500 break;
501 }
502 tcon = tlink_tcon(tlink);
503 if (!smb3_encryption_required(tcon)) {
504 rc = -EOPNOTSUPP;
505 cifs_put_tlink(tlink);
506 break;
507 }
508 pkey_inf.cipher_type =
509 le16_to_cpu(tcon->ses->server->cipher_type);
510 pkey_inf.Suid = tcon->ses->Suid;
511 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
512 16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
513 memcpy(pkey_inf.smb3decryptionkey,
514 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
515 memcpy(pkey_inf.smb3encryptionkey,
516 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
517 if (copy_to_user((void __user *)arg, &pkey_inf,
518 sizeof(struct smb3_key_debug_info)))
519 rc = -EFAULT;
520 else
521 rc = 0;
522 cifs_put_tlink(tlink);
523 break;
524 case CIFS_DUMP_FULL_KEY:
525 /*
526 * Dump encryption keys (handles any key sizes)
527 */
528 if (pSMBFile == NULL)
529 break;
530 if (!capable(CAP_SYS_ADMIN)) {
531 rc = -EACCES;
532 break;
533 }
534 cifs_sb = CIFS_SB(inode->i_sb);
535 tlink = cifs_sb_tlink(cifs_sb);
536 if (IS_ERR(tlink)) {
537 rc = PTR_ERR(tlink);
538 break;
539 }
540
541 tcon = tlink_tcon(tlink);
542 rc = cifs_dump_full_key(tcon, (void __user *)arg);
543 cifs_put_tlink(tlink);
544 break;
545 case CIFS_IOC_NOTIFY:
546 if (!S_ISDIR(inode->i_mode)) {
547 /* Notify can only be done on directories */
548 rc = -EOPNOTSUPP;
549 break;
550 }
551 cifs_sb = CIFS_SB(inode->i_sb);
552 tlink = cifs_sb_tlink(cifs_sb);
553 if (IS_ERR(tlink)) {
554 rc = PTR_ERR(tlink);
555 break;
556 }
557 tcon = tlink_tcon(tlink);
558 if (tcon && tcon->ses->server->ops->notify) {
559 rc = tcon->ses->server->ops->notify(xid,
560 filep, (void __user *)arg,
561 false /* no ret data */);
562 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
563 } else
564 rc = -EOPNOTSUPP;
565 cifs_put_tlink(tlink);
566 break;
567 case CIFS_IOC_NOTIFY_INFO:
568 if (!S_ISDIR(inode->i_mode)) {
569 /* Notify can only be done on directories */
570 rc = -EOPNOTSUPP;
571 break;
572 }
573 cifs_sb = CIFS_SB(inode->i_sb);
574 tlink = cifs_sb_tlink(cifs_sb);
575 if (IS_ERR(tlink)) {
576 rc = PTR_ERR(tlink);
577 break;
578 }
579 tcon = tlink_tcon(tlink);
580 if (tcon && tcon->ses->server->ops->notify) {
581 rc = tcon->ses->server->ops->notify(xid,
582 filep, (void __user *)arg,
583 true /* return details */);
584 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc);
585 } else
586 rc = -EOPNOTSUPP;
587 cifs_put_tlink(tlink);
588 break;
589 case CIFS_IOC_SHUTDOWN:
590 rc = cifs_shutdown(inode->i_sb, arg);
591 break;
592 default:
593 cifs_dbg(FYI, "unsupported ioctl\n");
594 break;
595 }
596 cifs_ioc_exit:
597 free_xid(xid);
598 return rc;
599 }
600