summaryrefslogtreecommitdiffstats
path: root/fs/cifs/ioctl.c
blob: d67d281ab86320750081114ff8bebd935d39d289 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
/*
 *   fs/cifs/ioctl.c
 *
 *   vfs operations that deal with io control
 *
 *   Copyright (C) International Business Machines  Corp., 2005,2013
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifsfs.h"
#include "cifs_ioctl.h"
#include "smb2proto.h"
#include "smb2glob.h"
#include <linux/btrfs.h>

static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
				  unsigned long p)
{
	struct inode *inode = file_inode(filep);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct dentry *dentry = filep->f_path.dentry;
	const unsigned char *path;
	void *page = alloc_dentry_path();
	__le16 *utf16_path = NULL, root_path;
	int rc = 0;

	path = build_path_from_dentry(dentry, page);
	if (IS_ERR(path)) {
		free_dentry_path(page);
		return PTR_ERR(path);
	}

	cifs_dbg(FYI, "%s %s\n", __func__, path);

	if (!path[0]) {
		root_path = 0;
		utf16_path = &root_path;
	} else {
		utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
		if (!utf16_path) {
			rc = -ENOMEM;
			goto ici_exit;
		}
	}

	if (tcon->ses->server->ops->ioctl_query_info)
		rc = tcon->ses->server->ops->ioctl_query_info(
				xid, tcon, cifs_sb, utf16_path,
				filep->private_data ? 0 : 1, p);
	else
		rc = -EOPNOTSUPP;

 ici_exit:
	if (utf16_path != &root_path)
		kfree(utf16_path);
	free_dentry_path(page);
	return rc;
}

static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
			unsigned long srcfd)
{
	int rc;
	struct fd src_file;
	struct inode *src_inode;

	cifs_dbg(FYI, "ioctl copychunk range\n");
	/* the destination must be opened for writing */
	if (!(dst_file->f_mode & FMODE_WRITE)) {
		cifs_dbg(FYI, "file target not open for write\n");
		return -EINVAL;
	}

	/* check if target volume is readonly and take reference */
	rc = mnt_want_write_file(dst_file);
	if (rc) {
		cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
		return rc;
	}

	src_file = fdget(srcfd);
	if (!src_file.file) {
		rc = -EBADF;
		goto out_drop_write;
	}

	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
		rc = -EBADF;
		cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
		goto out_fput;
	}

	src_inode = file_inode(src_file.file);
	rc = -EINVAL;
	if (S_ISDIR(src_inode->i_mode))
		goto out_fput;

	rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
					src_inode->i_size, 0);
	if (rc > 0)
		rc = 0;
out_fput:
	fdput(src_file);
out_drop_write:
	mnt_drop_write_file(dst_file);
	return rc;
}

static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
				void __user *arg)
{
	int rc = 0;
	struct smb_mnt_fs_info *fsinf;

	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
	if (fsinf == NULL)
		return -ENOMEM;

	fsinf->version = 1;
	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
	fsinf->device_characteristics =
			le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
	fsinf->max_path_component =
		le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
	fsinf->vol_serial_number = tcon->vol_serial_number;
	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
	fsinf->share_flags = tcon->share_flags;
	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
	fsinf->sector_flags = tcon->ss_flags;
	fsinf->optimal_sector_size = tcon->perf_sector_size;
	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
	fsinf->maximal_access = tcon->maximal_access;
	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);

	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
		rc = -EFAULT;

	kfree(fsinf);
	return rc;
}

static int cifs_shutdown(struct super_block *sb, unsigned long arg)
{
	struct cifs_sb_info *sbi = CIFS_SB(sb);
	__u32 flags;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (get_user(flags, (__u32 __user *)arg))
		return -EFAULT;

	if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
		return -EINVAL;

	if (cifs_forced_shutdown(sbi))
		return 0;

	cifs_dbg(VFS, "shut down requested (%d)", flags);
/*	trace_cifs_shutdown(sb, flags);*/

	/*
	 * see:
	 *   https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
	 * for more information and description of original intent of the flags
	 */
	switch (flags) {
	/*
	 * We could add support later for default flag which requires:
	 *     "Flush all dirty data and metadata to disk"
	 * would need to call syncfs or equivalent to flush page cache for
	 * the mount and then issue fsync to server (if nostrictsync not set)
	 */
	case CIFS_GOING_FLAGS_DEFAULT:
		cifs_dbg(FYI, "shutdown with default flag not supported\n");
		return -EINVAL;
	/*
	 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
	 * data) but metadata writes are not cached on the client, so can treat
	 * it similarly to NOLOGFLUSH
	 */
	case CIFS_GOING_FLAGS_LOGFLUSH:
	case CIFS_GOING_FLAGS_NOLOGFLUSH:
		sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
		return 0;
	default:
		return -EINVAL;
	}
	return 0;
}

static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
{
	struct smb3_full_key_debug_info out;
	struct cifs_ses *ses;
	int rc = 0;
	bool found = false;
	u8 __user *end;

	if (!smb3_encryption_required(tcon)) {
		rc = -EOPNOTSUPP;
		goto out;
	}

	/* copy user input into our output buffer */
	if (copy_from_user(&out, in, sizeof(out))) {
		rc = -EINVAL;
		goto out;
	}

	if (!out.session_id) {
		/* if ses id is 0, use current user session */
		ses = tcon->ses;
	} else {
		/* otherwise if a session id is given, look for it in all our sessions */
		struct cifs_ses *ses_it = NULL;
		struct TCP_Server_Info *server_it = NULL;

		spin_lock(&cifs_tcp_ses_lock);
		list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
			list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
				if (ses_it->Suid == out.session_id) {
					ses = ses_it;
					/*
					 * since we are using the session outside the crit
					 * section, we need to make sure it won't be released
					 * so increment its refcount
					 */
					ses->ses_count++;
					found = true;
					goto search_end;
				}
			}
		}
search_end:
		spin_unlock(&cifs_tcp_ses_lock);
		if (!found) {
			rc = -ENOENT;
			goto out;
		}
	}

	switch (ses->server->cipher_type) {
	case SMB2_ENCRYPTION_AES128_CCM:
	case SMB2_ENCRYPTION_AES128_GCM:
		out.session_key_length = CIFS_SESS_KEY_SIZE;
		out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
		break;
	case SMB2_ENCRYPTION_AES256_CCM:
	case SMB2_ENCRYPTION_AES256_GCM:
		out.session_key_length = CIFS_SESS_KEY_SIZE;
		out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
		break;
	default:
		rc = -EOPNOTSUPP;
		goto out;
	}

	/* check if user buffer is big enough to store all the keys */
	if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
	    + out.server_out_key_length) {
		rc = -ENOBUFS;
		goto out;
	}

	out.session_id = ses->Suid;
	out.cipher_type = le16_to_cpu(ses->server->cipher_type);

	/* overwrite user input with our output */
	if (copy_to_user(in, &out, sizeof(out))) {
		rc = -EINVAL;
		goto out;
	}

	/* append all the keys at the end of the user buffer */
	end = in->data;
	if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
		rc = -EINVAL;
		goto out;
	}
	end += out.session_key_length;

	if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
		rc = -EINVAL;
		goto out;
	}
	end += out.server_in_key_length;

	if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
		rc = -EINVAL;
		goto out;
	}

out:
	if (found)
		cifs_put_smb_ses(ses);
	return rc;
}

long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
{
	struct inode *inode = file_inode(filep);
	struct smb3_key_debug_info pkey_inf;
	int rc = -ENOTTY; /* strange error - but the precedent */
	unsigned int xid;
	struct cifsFileInfo *pSMBFile = filep->private_data;
	struct cifs_tcon *tcon;
	struct tcon_link *tlink;
	struct cifs_sb_info *cifs_sb;
	__u64	ExtAttrBits = 0;
	__u64   caps;

	xid = get_xid();

	cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
	switch (command) {
		case FS_IOC_GETFLAGS:
			if (pSMBFile == NULL)
				break;
			tcon = tlink_tcon(pSMBFile->tlink);
			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
#ifdef CONFIG_CIFS_POSIX
			if (CIFS_UNIX_EXTATTR_CAP & caps) {
				__u64	ExtAttrMask = 0;
				rc = CIFSGetExtAttr(xid, tcon,
						    pSMBFile->fid.netfid,
						    &ExtAttrBits, &ExtAttrMask);
				if (rc == 0)
					rc = put_user(ExtAttrBits &
						FS_FL_USER_VISIBLE,
						(int __user *)arg);
				if (rc != EOPNOTSUPP)
					break;
			}
#endif /* CONFIG_CIFS_POSIX */
			rc = 0;
			if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
				/* add in the compressed bit */
				ExtAttrBits = FS_COMPR_FL;
				rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
					      (int __user *)arg);
			}
			break;
		case FS_IOC_SETFLAGS:
			if (pSMBFile == NULL)
				break;
			tcon = tlink_tcon(pSMBFile->tlink);
			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);

			if (get_user(ExtAttrBits, (int __user *)arg)) {
				rc = -EFAULT;
				break;
			}

			/*
			 * if (CIFS_UNIX_EXTATTR_CAP & caps)
			 *	rc = CIFSSetExtAttr(xid, tcon,
			 *		       pSMBFile->fid.netfid,
			 *		       extAttrBits,
			 *		       &ExtAttrMask);
			 * if (rc != EOPNOTSUPP)
			 *	break;
			 */

			/* Currently only flag we can set is compressed flag */
			if ((ExtAttrBits & FS_COMPR_FL) == 0)
				break;

			/* Try to set compress flag */
			if (tcon->ses->server->ops->set_compression) {
				rc = tcon->ses->server->ops->set_compression(
							xid, tcon, pSMBFile);
				cifs_dbg(FYI, "set compress flag rc %d\n", rc);
			}
			break;
		case CIFS_IOC_COPYCHUNK_FILE:
			rc = cifs_ioctl_copychunk(xid, filep, arg);
			break;
		case CIFS_QUERY_INFO:
			rc = cifs_ioctl_query_info(xid, filep, arg);
			break;
		case CIFS_IOC_SET_INTEGRITY:
			if (pSMBFile == NULL)
				break;
			tcon = tlink_tcon(pSMBFile->tlink);
			if (tcon->ses->server->ops->set_integrity)
				rc = tcon->ses->server->ops->set_integrity(xid,
						tcon, pSMBFile);
			else
				rc = -EOPNOTSUPP;
			break;
		case CIFS_IOC_GET_MNT_INFO:
			if (pSMBFile == NULL)
				break;
			tcon = tlink_tcon(pSMBFile->tlink);
			rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
			break;
		case CIFS_ENUMERATE_SNAPSHOTS:
			if (pSMBFile == NULL)
				break;
			if (arg == 0) {
				rc = -EINVAL;
				goto cifs_ioc_exit;
			}
			tcon = tlink_tcon(pSMBFile->tlink);
			if (tcon->ses->server->ops->enum_snapshots)
				rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
						pSMBFile, (void __user *)arg);
			else
				rc = -EOPNOTSUPP;
			break;
		case CIFS_DUMP_KEY:
			/*
			 * Dump encryption keys. This is an old ioctl that only
			 * handles AES-128-{CCM,GCM}.
			 */
			if (pSMBFile == NULL)
				break;
			if (!capable(CAP_SYS_ADMIN)) {
				rc = -EACCES;
				break;
			}

			tcon = tlink_tcon(pSMBFile->tlink);
			if (!smb3_encryption_required(tcon)) {
				rc = -EOPNOTSUPP;
				break;
			}
			pkey_inf.cipher_type =
				le16_to_cpu(tcon->ses->server->cipher_type);
			pkey_inf.Suid = tcon->ses->Suid;
			memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
					16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
			memcpy(pkey_inf.smb3decryptionkey,
			      tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
			memcpy(pkey_inf.smb3encryptionkey,
			      tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
			if (copy_to_user((void __user *)arg, &pkey_inf,
					sizeof(struct smb3_key_debug_info)))
				rc = -EFAULT;
			else
				rc = 0;
			break;
		case CIFS_DUMP_FULL_KEY:
			/*
			 * Dump encryption keys (handles any key sizes)
			 */
			if (pSMBFile == NULL)
				break;
			if (!capable(CAP_SYS_ADMIN)) {
				rc = -EACCES;
				break;
			}
			tcon = tlink_tcon(pSMBFile->tlink);
			rc = cifs_dump_full_key(tcon, (void __user *)arg);
			break;
		case CIFS_IOC_NOTIFY:
			if (!S_ISDIR(inode->i_mode)) {
				/* Notify can only be done on directories */
				rc = -EOPNOTSUPP;
				break;
			}
			cifs_sb = CIFS_SB(inode->i_sb);
			tlink = cifs_sb_tlink(cifs_sb);
			if (IS_ERR(tlink)) {
				rc = PTR_ERR(tlink);
				break;
			}
			tcon = tlink_tcon(tlink);
			if (tcon && tcon->ses->server->ops->notify) {
				rc = tcon->ses->server->ops->notify(xid,
						filep, (void __user *)arg);
				cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
			} else
				rc = -EOPNOTSUPP;
			cifs_put_tlink(tlink);
			break;
		case CIFS_IOC_SHUTDOWN:
			rc = cifs_shutdown(inode->i_sb, arg);
			break;
		default:
			cifs_dbg(FYI, "unsupported ioctl\n");
			break;
	}
cifs_ioc_exit:
	free_xid(xid);
	return rc;
}