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->device_characteristics =
147 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
148 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
149 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
150 fsinf->max_path_component =
151 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
152 fsinf->vol_serial_number = tcon->vol_serial_number;
153 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
154 fsinf->share_flags = tcon->share_flags;
155 fsinf->share_caps = le32_to_cpu(tcon->capabilities);
156 fsinf->sector_flags = tcon->ss_flags;
157 fsinf->optimal_sector_size = tcon->perf_sector_size;
158 fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
159 fsinf->maximal_access = tcon->maximal_access;
160 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
161
162 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
163 rc = -EFAULT;
164
165 kfree(fsinf);
166 return rc;
167 }
168
cifs_shutdown(struct super_block * sb,unsigned long arg)169 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
170 {
171 struct cifs_sb_info *sbi = CIFS_SB(sb);
172 __u32 flags;
173
174 if (!capable(CAP_SYS_ADMIN))
175 return -EPERM;
176
177 if (get_user(flags, (__u32 __user *)arg))
178 return -EFAULT;
179
180 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
181 return -EINVAL;
182
183 if (cifs_forced_shutdown(sbi))
184 return 0;
185
186 cifs_dbg(VFS, "shut down requested (%d)", flags);
187 /* trace_cifs_shutdown(sb, flags);*/
188
189 /*
190 * see:
191 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
192 * for more information and description of original intent of the flags
193 */
194 switch (flags) {
195 /*
196 * We could add support later for default flag which requires:
197 * "Flush all dirty data and metadata to disk"
198 * would need to call syncfs or equivalent to flush page cache for
199 * the mount and then issue fsync to server (if nostrictsync not set)
200 */
201 case CIFS_GOING_FLAGS_DEFAULT:
202 cifs_dbg(FYI, "shutdown with default flag not supported\n");
203 return -EINVAL;
204 /*
205 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
206 * data) but metadata writes are not cached on the client, so can treat
207 * it similarly to NOLOGFLUSH
208 */
209 case CIFS_GOING_FLAGS_LOGFLUSH:
210 case CIFS_GOING_FLAGS_NOLOGFLUSH:
211 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
212 return 0;
213 default:
214 return -EINVAL;
215 }
216 return 0;
217 }
218
cifs_dump_full_key(struct cifs_tcon * tcon,struct smb3_full_key_debug_info __user * in)219 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
220 {
221 struct smb3_full_key_debug_info out;
222 struct cifs_ses *ses;
223 int rc = 0;
224 bool found = false;
225 u8 __user *end;
226
227 if (!smb3_encryption_required(tcon)) {
228 rc = -EOPNOTSUPP;
229 goto out;
230 }
231
232 /* copy user input into our output buffer */
233 if (copy_from_user(&out, in, sizeof(out))) {
234 rc = -EINVAL;
235 goto out;
236 }
237
238 if (!out.session_id) {
239 /* if ses id is 0, use current user session */
240 ses = tcon->ses;
241 } else {
242 /* otherwise if a session id is given, look for it in all our sessions */
243 struct cifs_ses *ses_it = NULL;
244 struct TCP_Server_Info *server_it = NULL;
245
246 spin_lock(&cifs_tcp_ses_lock);
247 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
248 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
249 if (ses_it->Suid == out.session_id) {
250 ses = ses_it;
251 /*
252 * since we are using the session outside the crit
253 * section, we need to make sure it won't be released
254 * so increment its refcount
255 */
256 cifs_smb_ses_inc_refcount(ses);
257 found = true;
258 goto search_end;
259 }
260 }
261 }
262 search_end:
263 spin_unlock(&cifs_tcp_ses_lock);
264 if (!found) {
265 rc = -ENOENT;
266 goto out;
267 }
268 }
269
270 switch (ses->server->cipher_type) {
271 case SMB2_ENCRYPTION_AES128_CCM:
272 case SMB2_ENCRYPTION_AES128_GCM:
273 out.session_key_length = CIFS_SESS_KEY_SIZE;
274 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
275 break;
276 case SMB2_ENCRYPTION_AES256_CCM:
277 case SMB2_ENCRYPTION_AES256_GCM:
278 out.session_key_length = CIFS_SESS_KEY_SIZE;
279 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
280 break;
281 default:
282 rc = -EOPNOTSUPP;
283 goto out;
284 }
285
286 /* check if user buffer is big enough to store all the keys */
287 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
288 + out.server_out_key_length) {
289 rc = -ENOBUFS;
290 goto out;
291 }
292
293 out.session_id = ses->Suid;
294 out.cipher_type = le16_to_cpu(ses->server->cipher_type);
295
296 /* overwrite user input with our output */
297 if (copy_to_user(in, &out, sizeof(out))) {
298 rc = -EINVAL;
299 goto out;
300 }
301
302 /* append all the keys at the end of the user buffer */
303 end = in->data;
304 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
305 rc = -EINVAL;
306 goto out;
307 }
308 end += out.session_key_length;
309
310 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
311 rc = -EINVAL;
312 goto out;
313 }
314 end += out.server_in_key_length;
315
316 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
317 rc = -EINVAL;
318 goto out;
319 }
320
321 out:
322 if (found)
323 cifs_put_smb_ses(ses);
324 return rc;
325 }
326
cifs_ioctl(struct file * filep,unsigned int command,unsigned long arg)327 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
328 {
329 struct inode *inode = file_inode(filep);
330 struct smb3_key_debug_info pkey_inf;
331 int rc = -ENOTTY; /* strange error - but the precedent */
332 unsigned int xid;
333 struct cifsFileInfo *pSMBFile = filep->private_data;
334 struct cifs_tcon *tcon;
335 struct tcon_link *tlink;
336 struct cifs_sb_info *cifs_sb;
337 __u64 ExtAttrBits = 0;
338 #ifdef CONFIG_CIFS_POSIX
339 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
340 __u64 caps;
341 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
342 #endif /* CONFIG_CIFS_POSIX */
343
344 xid = get_xid();
345
346 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
347 switch (command) {
348 case FS_IOC_GETFLAGS:
349 if (pSMBFile == NULL)
350 break;
351 tcon = tlink_tcon(pSMBFile->tlink);
352 #ifdef CONFIG_CIFS_POSIX
353 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
354 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
355 if (CIFS_UNIX_EXTATTR_CAP & caps) {
356 __u64 ExtAttrMask = 0;
357 rc = CIFSGetExtAttr(xid, tcon,
358 pSMBFile->fid.netfid,
359 &ExtAttrBits, &ExtAttrMask);
360 if (rc == 0)
361 rc = put_user(ExtAttrBits &
362 FS_FL_USER_VISIBLE,
363 (int __user *)arg);
364 if (rc != -EOPNOTSUPP)
365 break;
366 }
367 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
368 #endif /* CONFIG_CIFS_POSIX */
369 rc = 0;
370 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
371 /* add in the compressed bit */
372 ExtAttrBits = FS_COMPR_FL;
373 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
374 (int __user *)arg);
375 }
376 break;
377 case FS_IOC_SETFLAGS:
378 if (pSMBFile == NULL)
379 break;
380 tcon = tlink_tcon(pSMBFile->tlink);
381 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */
382
383 if (get_user(ExtAttrBits, (int __user *)arg)) {
384 rc = -EFAULT;
385 break;
386 }
387
388 /*
389 * if (CIFS_UNIX_EXTATTR_CAP & caps)
390 * rc = CIFSSetExtAttr(xid, tcon,
391 * pSMBFile->fid.netfid,
392 * extAttrBits,
393 * &ExtAttrMask);
394 * if (rc != -EOPNOTSUPP)
395 * break;
396 */
397
398 /* Currently only flag we can set is compressed flag */
399 if ((ExtAttrBits & FS_COMPR_FL) == 0)
400 break;
401
402 /* Try to set compress flag */
403 if (tcon->ses->server->ops->set_compression) {
404 rc = tcon->ses->server->ops->set_compression(
405 xid, tcon, pSMBFile);
406 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
407 }
408 break;
409 case CIFS_IOC_COPYCHUNK_FILE:
410 rc = cifs_ioctl_copychunk(xid, filep, arg);
411 break;
412 case CIFS_QUERY_INFO:
413 rc = cifs_ioctl_query_info(xid, filep, arg);
414 break;
415 case CIFS_IOC_SET_INTEGRITY:
416 if (pSMBFile == NULL)
417 break;
418 tcon = tlink_tcon(pSMBFile->tlink);
419 if (tcon->ses->server->ops->set_integrity)
420 rc = tcon->ses->server->ops->set_integrity(xid,
421 tcon, pSMBFile);
422 else
423 rc = -EOPNOTSUPP;
424 break;
425 case CIFS_IOC_GET_MNT_INFO:
426 if (pSMBFile == NULL)
427 break;
428 tcon = tlink_tcon(pSMBFile->tlink);
429 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
430 break;
431 case CIFS_IOC_GET_TCON_INFO:
432 cifs_sb = CIFS_SB(inode->i_sb);
433 tlink = cifs_sb_tlink(cifs_sb);
434 if (IS_ERR(tlink)) {
435 rc = PTR_ERR(tlink);
436 break;
437 }
438 tcon = tlink_tcon(tlink);
439 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg);
440 cifs_put_tlink(tlink);
441 break;
442 case CIFS_ENUMERATE_SNAPSHOTS:
443 if (pSMBFile == NULL)
444 break;
445 if (arg == 0) {
446 rc = -EINVAL;
447 goto cifs_ioc_exit;
448 }
449 tcon = tlink_tcon(pSMBFile->tlink);
450 if (tcon->ses->server->ops->enum_snapshots)
451 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
452 pSMBFile, (void __user *)arg);
453 else
454 rc = -EOPNOTSUPP;
455 break;
456 case CIFS_DUMP_KEY:
457 /*
458 * Dump encryption keys. This is an old ioctl that only
459 * handles AES-128-{CCM,GCM}.
460 */
461 if (!capable(CAP_SYS_ADMIN)) {
462 rc = -EACCES;
463 break;
464 }
465
466 cifs_sb = CIFS_SB(inode->i_sb);
467 tlink = cifs_sb_tlink(cifs_sb);
468 if (IS_ERR(tlink)) {
469 rc = PTR_ERR(tlink);
470 break;
471 }
472 tcon = tlink_tcon(tlink);
473 if (!smb3_encryption_required(tcon)) {
474 rc = -EOPNOTSUPP;
475 cifs_put_tlink(tlink);
476 break;
477 }
478 pkey_inf.cipher_type =
479 le16_to_cpu(tcon->ses->server->cipher_type);
480 pkey_inf.Suid = tcon->ses->Suid;
481 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
482 16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
483 memcpy(pkey_inf.smb3decryptionkey,
484 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
485 memcpy(pkey_inf.smb3encryptionkey,
486 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
487 if (copy_to_user((void __user *)arg, &pkey_inf,
488 sizeof(struct smb3_key_debug_info)))
489 rc = -EFAULT;
490 else
491 rc = 0;
492 cifs_put_tlink(tlink);
493 break;
494 case CIFS_DUMP_FULL_KEY:
495 /*
496 * Dump encryption keys (handles any key sizes)
497 */
498 if (pSMBFile == NULL)
499 break;
500 if (!capable(CAP_SYS_ADMIN)) {
501 rc = -EACCES;
502 break;
503 }
504 cifs_sb = CIFS_SB(inode->i_sb);
505 tlink = cifs_sb_tlink(cifs_sb);
506 if (IS_ERR(tlink)) {
507 rc = PTR_ERR(tlink);
508 break;
509 }
510
511 tcon = tlink_tcon(tlink);
512 rc = cifs_dump_full_key(tcon, (void __user *)arg);
513 cifs_put_tlink(tlink);
514 break;
515 case CIFS_IOC_NOTIFY:
516 if (!S_ISDIR(inode->i_mode)) {
517 /* Notify can only be done on directories */
518 rc = -EOPNOTSUPP;
519 break;
520 }
521 cifs_sb = CIFS_SB(inode->i_sb);
522 tlink = cifs_sb_tlink(cifs_sb);
523 if (IS_ERR(tlink)) {
524 rc = PTR_ERR(tlink);
525 break;
526 }
527 tcon = tlink_tcon(tlink);
528 if (tcon && tcon->ses->server->ops->notify) {
529 rc = tcon->ses->server->ops->notify(xid,
530 filep, (void __user *)arg,
531 false /* no ret data */);
532 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
533 } else
534 rc = -EOPNOTSUPP;
535 cifs_put_tlink(tlink);
536 break;
537 case CIFS_IOC_NOTIFY_INFO:
538 if (!S_ISDIR(inode->i_mode)) {
539 /* Notify can only be done on directories */
540 rc = -EOPNOTSUPP;
541 break;
542 }
543 cifs_sb = CIFS_SB(inode->i_sb);
544 tlink = cifs_sb_tlink(cifs_sb);
545 if (IS_ERR(tlink)) {
546 rc = PTR_ERR(tlink);
547 break;
548 }
549 tcon = tlink_tcon(tlink);
550 if (tcon && tcon->ses->server->ops->notify) {
551 rc = tcon->ses->server->ops->notify(xid,
552 filep, (void __user *)arg,
553 true /* return details */);
554 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc);
555 } else
556 rc = -EOPNOTSUPP;
557 cifs_put_tlink(tlink);
558 break;
559 case CIFS_IOC_SHUTDOWN:
560 rc = cifs_shutdown(inode->i_sb, arg);
561 break;
562 default:
563 cifs_dbg(FYI, "unsupported ioctl\n");
564 break;
565 }
566 cifs_ioc_exit:
567 free_xid(xid);
568 return rc;
569 }
570