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_fsinfo(unsigned int xid,struct cifs_tcon * tcon,void __user * arg)120 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
121 void __user *arg)
122 {
123 int rc = 0;
124 struct smb_mnt_fs_info *fsinf;
125
126 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
127 if (fsinf == NULL)
128 return -ENOMEM;
129
130 fsinf->version = 1;
131 fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
132 fsinf->device_characteristics =
133 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
134 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
135 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
136 fsinf->max_path_component =
137 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
138 fsinf->vol_serial_number = tcon->vol_serial_number;
139 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
140 fsinf->share_flags = tcon->share_flags;
141 fsinf->share_caps = le32_to_cpu(tcon->capabilities);
142 fsinf->sector_flags = tcon->ss_flags;
143 fsinf->optimal_sector_size = tcon->perf_sector_size;
144 fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
145 fsinf->maximal_access = tcon->maximal_access;
146 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
147
148 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
149 rc = -EFAULT;
150
151 kfree(fsinf);
152 return rc;
153 }
154
cifs_shutdown(struct super_block * sb,unsigned long arg)155 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
156 {
157 struct cifs_sb_info *sbi = CIFS_SB(sb);
158 __u32 flags;
159
160 if (!capable(CAP_SYS_ADMIN))
161 return -EPERM;
162
163 if (get_user(flags, (__u32 __user *)arg))
164 return -EFAULT;
165
166 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
167 return -EINVAL;
168
169 if (cifs_forced_shutdown(sbi))
170 return 0;
171
172 cifs_dbg(VFS, "shut down requested (%d)", flags);
173 /* trace_cifs_shutdown(sb, flags);*/
174
175 /*
176 * see:
177 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
178 * for more information and description of original intent of the flags
179 */
180 switch (flags) {
181 /*
182 * We could add support later for default flag which requires:
183 * "Flush all dirty data and metadata to disk"
184 * would need to call syncfs or equivalent to flush page cache for
185 * the mount and then issue fsync to server (if nostrictsync not set)
186 */
187 case CIFS_GOING_FLAGS_DEFAULT:
188 cifs_dbg(FYI, "shutdown with default flag not supported\n");
189 return -EINVAL;
190 /*
191 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
192 * data) but metadata writes are not cached on the client, so can treat
193 * it similarly to NOLOGFLUSH
194 */
195 case CIFS_GOING_FLAGS_LOGFLUSH:
196 case CIFS_GOING_FLAGS_NOLOGFLUSH:
197 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
198 return 0;
199 default:
200 return -EINVAL;
201 }
202 return 0;
203 }
204
cifs_dump_full_key(struct cifs_tcon * tcon,struct smb3_full_key_debug_info __user * in)205 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
206 {
207 struct smb3_full_key_debug_info out;
208 struct cifs_ses *ses;
209 int rc = 0;
210 bool found = false;
211 u8 __user *end;
212
213 if (!smb3_encryption_required(tcon)) {
214 rc = -EOPNOTSUPP;
215 goto out;
216 }
217
218 /* copy user input into our output buffer */
219 if (copy_from_user(&out, in, sizeof(out))) {
220 rc = -EINVAL;
221 goto out;
222 }
223
224 if (!out.session_id) {
225 /* if ses id is 0, use current user session */
226 ses = tcon->ses;
227 } else {
228 /* otherwise if a session id is given, look for it in all our sessions */
229 struct cifs_ses *ses_it = NULL;
230 struct TCP_Server_Info *server_it = NULL;
231
232 spin_lock(&cifs_tcp_ses_lock);
233 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
234 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
235 if (ses_it->Suid == out.session_id) {
236 ses = ses_it;
237 /*
238 * since we are using the session outside the crit
239 * section, we need to make sure it won't be released
240 * so increment its refcount
241 */
242 cifs_smb_ses_inc_refcount(ses);
243 found = true;
244 goto search_end;
245 }
246 }
247 }
248 search_end:
249 spin_unlock(&cifs_tcp_ses_lock);
250 if (!found) {
251 rc = -ENOENT;
252 goto out;
253 }
254 }
255
256 switch (ses->server->cipher_type) {
257 case SMB2_ENCRYPTION_AES128_CCM:
258 case SMB2_ENCRYPTION_AES128_GCM:
259 out.session_key_length = CIFS_SESS_KEY_SIZE;
260 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
261 break;
262 case SMB2_ENCRYPTION_AES256_CCM:
263 case SMB2_ENCRYPTION_AES256_GCM:
264 out.session_key_length = CIFS_SESS_KEY_SIZE;
265 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
266 break;
267 default:
268 rc = -EOPNOTSUPP;
269 goto out;
270 }
271
272 /* check if user buffer is big enough to store all the keys */
273 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
274 + out.server_out_key_length) {
275 rc = -ENOBUFS;
276 goto out;
277 }
278
279 out.session_id = ses->Suid;
280 out.cipher_type = le16_to_cpu(ses->server->cipher_type);
281
282 /* overwrite user input with our output */
283 if (copy_to_user(in, &out, sizeof(out))) {
284 rc = -EINVAL;
285 goto out;
286 }
287
288 /* append all the keys at the end of the user buffer */
289 end = in->data;
290 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
291 rc = -EINVAL;
292 goto out;
293 }
294 end += out.session_key_length;
295
296 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
297 rc = -EINVAL;
298 goto out;
299 }
300 end += out.server_in_key_length;
301
302 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
303 rc = -EINVAL;
304 goto out;
305 }
306
307 out:
308 if (found)
309 cifs_put_smb_ses(ses);
310 return rc;
311 }
312
cifs_ioctl(struct file * filep,unsigned int command,unsigned long arg)313 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
314 {
315 struct inode *inode = file_inode(filep);
316 struct smb3_key_debug_info pkey_inf;
317 int rc = -ENOTTY; /* strange error - but the precedent */
318 unsigned int xid;
319 struct cifsFileInfo *pSMBFile = filep->private_data;
320 struct cifs_tcon *tcon;
321 struct tcon_link *tlink;
322 struct cifs_sb_info *cifs_sb;
323 __u64 ExtAttrBits = 0;
324 #ifdef CONFIG_CIFS_POSIX
325 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
326 __u64 caps;
327 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
328 #endif /* CONFIG_CIFS_POSIX */
329
330 xid = get_xid();
331
332 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
333 switch (command) {
334 case FS_IOC_GETFLAGS:
335 if (pSMBFile == NULL)
336 break;
337 tcon = tlink_tcon(pSMBFile->tlink);
338 #ifdef CONFIG_CIFS_POSIX
339 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
340 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
341 if (CIFS_UNIX_EXTATTR_CAP & caps) {
342 __u64 ExtAttrMask = 0;
343 rc = CIFSGetExtAttr(xid, tcon,
344 pSMBFile->fid.netfid,
345 &ExtAttrBits, &ExtAttrMask);
346 if (rc == 0)
347 rc = put_user(ExtAttrBits &
348 FS_FL_USER_VISIBLE,
349 (int __user *)arg);
350 if (rc != -EOPNOTSUPP)
351 break;
352 }
353 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
354 #endif /* CONFIG_CIFS_POSIX */
355 rc = 0;
356 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
357 /* add in the compressed bit */
358 ExtAttrBits = FS_COMPR_FL;
359 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
360 (int __user *)arg);
361 }
362 break;
363 case FS_IOC_SETFLAGS:
364 if (pSMBFile == NULL)
365 break;
366 tcon = tlink_tcon(pSMBFile->tlink);
367 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */
368
369 if (get_user(ExtAttrBits, (int __user *)arg)) {
370 rc = -EFAULT;
371 break;
372 }
373
374 /*
375 * if (CIFS_UNIX_EXTATTR_CAP & caps)
376 * rc = CIFSSetExtAttr(xid, tcon,
377 * pSMBFile->fid.netfid,
378 * extAttrBits,
379 * &ExtAttrMask);
380 * if (rc != -EOPNOTSUPP)
381 * break;
382 */
383
384 /* Currently only flag we can set is compressed flag */
385 if ((ExtAttrBits & FS_COMPR_FL) == 0)
386 break;
387
388 /* Try to set compress flag */
389 if (tcon->ses->server->ops->set_compression) {
390 rc = tcon->ses->server->ops->set_compression(
391 xid, tcon, pSMBFile);
392 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
393 }
394 break;
395 case CIFS_IOC_COPYCHUNK_FILE:
396 rc = cifs_ioctl_copychunk(xid, filep, arg);
397 break;
398 case CIFS_QUERY_INFO:
399 rc = cifs_ioctl_query_info(xid, filep, arg);
400 break;
401 case CIFS_IOC_SET_INTEGRITY:
402 if (pSMBFile == NULL)
403 break;
404 tcon = tlink_tcon(pSMBFile->tlink);
405 if (tcon->ses->server->ops->set_integrity)
406 rc = tcon->ses->server->ops->set_integrity(xid,
407 tcon, pSMBFile);
408 else
409 rc = -EOPNOTSUPP;
410 break;
411 case CIFS_IOC_GET_MNT_INFO:
412 if (pSMBFile == NULL)
413 break;
414 tcon = tlink_tcon(pSMBFile->tlink);
415 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
416 break;
417 case CIFS_ENUMERATE_SNAPSHOTS:
418 if (pSMBFile == NULL)
419 break;
420 if (arg == 0) {
421 rc = -EINVAL;
422 goto cifs_ioc_exit;
423 }
424 tcon = tlink_tcon(pSMBFile->tlink);
425 if (tcon->ses->server->ops->enum_snapshots)
426 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
427 pSMBFile, (void __user *)arg);
428 else
429 rc = -EOPNOTSUPP;
430 break;
431 case CIFS_DUMP_KEY:
432 /*
433 * Dump encryption keys. This is an old ioctl that only
434 * handles AES-128-{CCM,GCM}.
435 */
436 if (!capable(CAP_SYS_ADMIN)) {
437 rc = -EACCES;
438 break;
439 }
440
441 cifs_sb = CIFS_SB(inode->i_sb);
442 tlink = cifs_sb_tlink(cifs_sb);
443 if (IS_ERR(tlink)) {
444 rc = PTR_ERR(tlink);
445 break;
446 }
447 tcon = tlink_tcon(tlink);
448 if (!smb3_encryption_required(tcon)) {
449 rc = -EOPNOTSUPP;
450 cifs_put_tlink(tlink);
451 break;
452 }
453 pkey_inf.cipher_type =
454 le16_to_cpu(tcon->ses->server->cipher_type);
455 pkey_inf.Suid = tcon->ses->Suid;
456 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
457 16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
458 memcpy(pkey_inf.smb3decryptionkey,
459 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
460 memcpy(pkey_inf.smb3encryptionkey,
461 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
462 if (copy_to_user((void __user *)arg, &pkey_inf,
463 sizeof(struct smb3_key_debug_info)))
464 rc = -EFAULT;
465 else
466 rc = 0;
467 cifs_put_tlink(tlink);
468 break;
469 case CIFS_DUMP_FULL_KEY:
470 /*
471 * Dump encryption keys (handles any key sizes)
472 */
473 if (pSMBFile == NULL)
474 break;
475 if (!capable(CAP_SYS_ADMIN)) {
476 rc = -EACCES;
477 break;
478 }
479 cifs_sb = CIFS_SB(inode->i_sb);
480 tlink = cifs_sb_tlink(cifs_sb);
481 if (IS_ERR(tlink)) {
482 rc = PTR_ERR(tlink);
483 break;
484 }
485
486 tcon = tlink_tcon(tlink);
487 rc = cifs_dump_full_key(tcon, (void __user *)arg);
488 cifs_put_tlink(tlink);
489 break;
490 case CIFS_IOC_NOTIFY:
491 if (!S_ISDIR(inode->i_mode)) {
492 /* Notify can only be done on directories */
493 rc = -EOPNOTSUPP;
494 break;
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 (tcon && tcon->ses->server->ops->notify) {
504 rc = tcon->ses->server->ops->notify(xid,
505 filep, (void __user *)arg,
506 false /* no ret data */);
507 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
508 } else
509 rc = -EOPNOTSUPP;
510 cifs_put_tlink(tlink);
511 break;
512 case CIFS_IOC_NOTIFY_INFO:
513 if (!S_ISDIR(inode->i_mode)) {
514 /* Notify can only be done on directories */
515 rc = -EOPNOTSUPP;
516 break;
517 }
518 cifs_sb = CIFS_SB(inode->i_sb);
519 tlink = cifs_sb_tlink(cifs_sb);
520 if (IS_ERR(tlink)) {
521 rc = PTR_ERR(tlink);
522 break;
523 }
524 tcon = tlink_tcon(tlink);
525 if (tcon && tcon->ses->server->ops->notify) {
526 rc = tcon->ses->server->ops->notify(xid,
527 filep, (void __user *)arg,
528 true /* return details */);
529 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc);
530 } else
531 rc = -EOPNOTSUPP;
532 cifs_put_tlink(tlink);
533 break;
534 case CIFS_IOC_SHUTDOWN:
535 rc = cifs_shutdown(inode->i_sb, arg);
536 break;
537 default:
538 cifs_dbg(FYI, "unsupported ioctl\n");
539 break;
540 }
541 cifs_ioc_exit:
542 free_xid(xid);
543 return rc;
544 }
545
