1 /*
2  *   fs/cifs/ioctl.c
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  *   This library is free software; you can redistribute it and/or modify
10  *   it under the terms of the GNU Lesser General Public License as published
11  *   by the Free Software Foundation; either version 2.1 of the License, or
12  *   (at your option) any later version.
13  *
14  *   This library is distributed in the hope that it will be useful,
15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
17  *   the GNU Lesser General Public License for more details.
18  *
19  *   You should have received a copy of the GNU Lesser General Public License
20  *   along with this library; if not, write to the Free Software
21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23 
24 #include <linux/fs.h>
25 #include <linux/file.h>
26 #include <linux/mount.h>
27 #include <linux/mm.h>
28 #include <linux/pagemap.h>
29 #include "cifspdu.h"
30 #include "cifsglob.h"
31 #include "cifsproto.h"
32 #include "cifs_debug.h"
33 #include "cifsfs.h"
34 #include "cifs_ioctl.h"
35 #include "smb2proto.h"
36 #include <linux/btrfs.h>
37 
cifs_ioctl_query_info(unsigned int xid,struct file * filep,unsigned long p)38 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
39 				  unsigned long p)
40 {
41 	struct inode *inode = file_inode(filep);
42 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
43 	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
44 	struct dentry *dentry = filep->f_path.dentry;
45 	const unsigned char *path;
46 	void *page = alloc_dentry_path();
47 	__le16 *utf16_path = NULL, root_path;
48 	int rc = 0;
49 
50 	path = build_path_from_dentry(dentry, page);
51 	if (IS_ERR(path)) {
52 		free_dentry_path(page);
53 		return PTR_ERR(path);
54 	}
55 
56 	cifs_dbg(FYI, "%s %s\n", __func__, path);
57 
58 	if (!path[0]) {
59 		root_path = 0;
60 		utf16_path = &root_path;
61 	} else {
62 		utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
63 		if (!utf16_path) {
64 			rc = -ENOMEM;
65 			goto ici_exit;
66 		}
67 	}
68 
69 	if (tcon->ses->server->ops->ioctl_query_info)
70 		rc = tcon->ses->server->ops->ioctl_query_info(
71 				xid, tcon, cifs_sb, utf16_path,
72 				filep->private_data ? 0 : 1, p);
73 	else
74 		rc = -EOPNOTSUPP;
75 
76  ici_exit:
77 	if (utf16_path != &root_path)
78 		kfree(utf16_path);
79 	free_dentry_path(page);
80 	return rc;
81 }
82 
cifs_ioctl_copychunk(unsigned int xid,struct file * dst_file,unsigned long srcfd)83 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
84 			unsigned long srcfd)
85 {
86 	int rc;
87 	struct fd src_file;
88 	struct inode *src_inode;
89 
90 	cifs_dbg(FYI, "ioctl copychunk range\n");
91 	/* the destination must be opened for writing */
92 	if (!(dst_file->f_mode & FMODE_WRITE)) {
93 		cifs_dbg(FYI, "file target not open for write\n");
94 		return -EINVAL;
95 	}
96 
97 	/* check if target volume is readonly and take reference */
98 	rc = mnt_want_write_file(dst_file);
99 	if (rc) {
100 		cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
101 		return rc;
102 	}
103 
104 	src_file = fdget(srcfd);
105 	if (!src_file.file) {
106 		rc = -EBADF;
107 		goto out_drop_write;
108 	}
109 
110 	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
111 		rc = -EBADF;
112 		cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
113 		goto out_fput;
114 	}
115 
116 	src_inode = file_inode(src_file.file);
117 	rc = -EINVAL;
118 	if (S_ISDIR(src_inode->i_mode))
119 		goto out_fput;
120 
121 	rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
122 					src_inode->i_size, 0);
123 	if (rc > 0)
124 		rc = 0;
125 out_fput:
126 	fdput(src_file);
127 out_drop_write:
128 	mnt_drop_write_file(dst_file);
129 	return rc;
130 }
131 
smb_mnt_get_fsinfo(unsigned int xid,struct cifs_tcon * tcon,void __user * arg)132 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
133 				void __user *arg)
134 {
135 	int rc = 0;
136 	struct smb_mnt_fs_info *fsinf;
137 
138 	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
139 	if (fsinf == NULL)
140 		return -ENOMEM;
141 
142 	fsinf->version = 1;
143 	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
144 	fsinf->device_characteristics =
145 			le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
146 	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
147 	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
148 	fsinf->max_path_component =
149 		le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
150 	fsinf->vol_serial_number = tcon->vol_serial_number;
151 	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
152 	fsinf->share_flags = tcon->share_flags;
153 	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
154 	fsinf->sector_flags = tcon->ss_flags;
155 	fsinf->optimal_sector_size = tcon->perf_sector_size;
156 	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
157 	fsinf->maximal_access = tcon->maximal_access;
158 	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
159 
160 	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
161 		rc = -EFAULT;
162 
163 	kfree(fsinf);
164 	return rc;
165 }
166 
cifs_shutdown(struct super_block * sb,unsigned long arg)167 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
168 {
169 	struct cifs_sb_info *sbi = CIFS_SB(sb);
170 	__u32 flags;
171 
172 	if (!capable(CAP_SYS_ADMIN))
173 		return -EPERM;
174 
175 	if (get_user(flags, (__u32 __user *)arg))
176 		return -EFAULT;
177 
178 	if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
179 		return -EINVAL;
180 
181 	if (cifs_forced_shutdown(sbi))
182 		return 0;
183 
184 	cifs_dbg(VFS, "shut down requested (%d)", flags);
185 /*	trace_cifs_shutdown(sb, flags);*/
186 
187 	/*
188 	 * see:
189 	 *   https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
190 	 * for more information and description of original intent of the flags
191 	 */
192 	switch (flags) {
193 	/*
194 	 * We could add support later for default flag which requires:
195 	 *     "Flush all dirty data and metadata to disk"
196 	 * would need to call syncfs or equivalent to flush page cache for
197 	 * the mount and then issue fsync to server (if nostrictsync not set)
198 	 */
199 	case CIFS_GOING_FLAGS_DEFAULT:
200 		cifs_dbg(FYI, "shutdown with default flag not supported\n");
201 		return -EINVAL;
202 	/*
203 	 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
204 	 * data) but metadata writes are not cached on the client, so can treat
205 	 * it similarly to NOLOGFLUSH
206 	 */
207 	case CIFS_GOING_FLAGS_LOGFLUSH:
208 	case CIFS_GOING_FLAGS_NOLOGFLUSH:
209 		sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
210 		return 0;
211 	default:
212 		return -EINVAL;
213 	}
214 	return 0;
215 }
216 
cifs_dump_full_key(struct cifs_tcon * tcon,unsigned long arg)217 static int cifs_dump_full_key(struct cifs_tcon *tcon, unsigned long arg)
218 {
219 	struct smb3_full_key_debug_info pfull_key_inf;
220 	__u64 suid;
221 	struct list_head *tmp;
222 	struct cifs_ses *ses;
223 	bool found = false;
224 
225 	if (!smb3_encryption_required(tcon))
226 		return -EOPNOTSUPP;
227 
228 	ses = tcon->ses; /* default to user id for current user */
229 	if (get_user(suid, (__u64 __user *)arg))
230 		suid = 0;
231 	if (suid) {
232 		/* search to see if there is a session with a matching SMB UID */
233 		spin_lock(&cifs_tcp_ses_lock);
234 		list_for_each(tmp, &tcon->ses->server->smb_ses_list) {
235 			ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
236 			if (ses->Suid == suid) {
237 				found = true;
238 				break;
239 			}
240 		}
241 		spin_unlock(&cifs_tcp_ses_lock);
242 		if (found == false)
243 			return -EINVAL;
244 	} /* else uses default user's SMB UID (ie current user) */
245 
246 	pfull_key_inf.cipher_type = le16_to_cpu(ses->server->cipher_type);
247 	pfull_key_inf.Suid = ses->Suid;
248 	memcpy(pfull_key_inf.auth_key, ses->auth_key.response,
249 	       16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
250 	memcpy(pfull_key_inf.smb3decryptionkey, ses->smb3decryptionkey,
251 	       32 /* SMB3_ENC_DEC_KEY_SIZE */);
252 	memcpy(pfull_key_inf.smb3encryptionkey,
253 	       ses->smb3encryptionkey, 32 /* SMB3_ENC_DEC_KEY_SIZE */);
254 	if (copy_to_user((void __user *)arg, &pfull_key_inf,
255 			 sizeof(struct smb3_full_key_debug_info)))
256 		return -EFAULT;
257 
258 	return 0;
259 }
260 
cifs_ioctl(struct file * filep,unsigned int command,unsigned long arg)261 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
262 {
263 	struct inode *inode = file_inode(filep);
264 	struct smb3_key_debug_info pkey_inf;
265 	int rc = -ENOTTY; /* strange error - but the precedent */
266 	unsigned int xid;
267 	struct cifsFileInfo *pSMBFile = filep->private_data;
268 	struct cifs_tcon *tcon;
269 	struct tcon_link *tlink;
270 	struct cifs_sb_info *cifs_sb;
271 	__u64	ExtAttrBits = 0;
272 	__u64   caps;
273 
274 	xid = get_xid();
275 
276 	cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
277 	switch (command) {
278 		case FS_IOC_GETFLAGS:
279 			if (pSMBFile == NULL)
280 				break;
281 			tcon = tlink_tcon(pSMBFile->tlink);
282 			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
283 #ifdef CONFIG_CIFS_POSIX
284 			if (CIFS_UNIX_EXTATTR_CAP & caps) {
285 				__u64	ExtAttrMask = 0;
286 				rc = CIFSGetExtAttr(xid, tcon,
287 						    pSMBFile->fid.netfid,
288 						    &ExtAttrBits, &ExtAttrMask);
289 				if (rc == 0)
290 					rc = put_user(ExtAttrBits &
291 						FS_FL_USER_VISIBLE,
292 						(int __user *)arg);
293 				if (rc != EOPNOTSUPP)
294 					break;
295 			}
296 #endif /* CONFIG_CIFS_POSIX */
297 			rc = 0;
298 			if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
299 				/* add in the compressed bit */
300 				ExtAttrBits = FS_COMPR_FL;
301 				rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
302 					      (int __user *)arg);
303 			}
304 			break;
305 		case FS_IOC_SETFLAGS:
306 			if (pSMBFile == NULL)
307 				break;
308 			tcon = tlink_tcon(pSMBFile->tlink);
309 			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
310 
311 			if (get_user(ExtAttrBits, (int __user *)arg)) {
312 				rc = -EFAULT;
313 				break;
314 			}
315 
316 			/*
317 			 * if (CIFS_UNIX_EXTATTR_CAP & caps)
318 			 *	rc = CIFSSetExtAttr(xid, tcon,
319 			 *		       pSMBFile->fid.netfid,
320 			 *		       extAttrBits,
321 			 *		       &ExtAttrMask);
322 			 * if (rc != EOPNOTSUPP)
323 			 *	break;
324 			 */
325 
326 			/* Currently only flag we can set is compressed flag */
327 			if ((ExtAttrBits & FS_COMPR_FL) == 0)
328 				break;
329 
330 			/* Try to set compress flag */
331 			if (tcon->ses->server->ops->set_compression) {
332 				rc = tcon->ses->server->ops->set_compression(
333 							xid, tcon, pSMBFile);
334 				cifs_dbg(FYI, "set compress flag rc %d\n", rc);
335 			}
336 			break;
337 		case CIFS_IOC_COPYCHUNK_FILE:
338 			rc = cifs_ioctl_copychunk(xid, filep, arg);
339 			break;
340 		case CIFS_QUERY_INFO:
341 			rc = cifs_ioctl_query_info(xid, filep, arg);
342 			break;
343 		case CIFS_IOC_SET_INTEGRITY:
344 			if (pSMBFile == NULL)
345 				break;
346 			tcon = tlink_tcon(pSMBFile->tlink);
347 			if (tcon->ses->server->ops->set_integrity)
348 				rc = tcon->ses->server->ops->set_integrity(xid,
349 						tcon, pSMBFile);
350 			else
351 				rc = -EOPNOTSUPP;
352 			break;
353 		case CIFS_IOC_GET_MNT_INFO:
354 			if (pSMBFile == NULL)
355 				break;
356 			tcon = tlink_tcon(pSMBFile->tlink);
357 			rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
358 			break;
359 		case CIFS_ENUMERATE_SNAPSHOTS:
360 			if (pSMBFile == NULL)
361 				break;
362 			if (arg == 0) {
363 				rc = -EINVAL;
364 				goto cifs_ioc_exit;
365 			}
366 			tcon = tlink_tcon(pSMBFile->tlink);
367 			if (tcon->ses->server->ops->enum_snapshots)
368 				rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
369 						pSMBFile, (void __user *)arg);
370 			else
371 				rc = -EOPNOTSUPP;
372 			break;
373 		case CIFS_DUMP_KEY:
374 			if (pSMBFile == NULL)
375 				break;
376 			if (!capable(CAP_SYS_ADMIN)) {
377 				rc = -EACCES;
378 				break;
379 			}
380 
381 			tcon = tlink_tcon(pSMBFile->tlink);
382 			if (!smb3_encryption_required(tcon)) {
383 				rc = -EOPNOTSUPP;
384 				break;
385 			}
386 			pkey_inf.cipher_type =
387 				le16_to_cpu(tcon->ses->server->cipher_type);
388 			pkey_inf.Suid = tcon->ses->Suid;
389 			memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
390 					16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
391 			memcpy(pkey_inf.smb3decryptionkey,
392 			      tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
393 			memcpy(pkey_inf.smb3encryptionkey,
394 			      tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
395 			if (copy_to_user((void __user *)arg, &pkey_inf,
396 					sizeof(struct smb3_key_debug_info)))
397 				rc = -EFAULT;
398 			else
399 				rc = 0;
400 			break;
401 		/*
402 		 * Dump full key (32 bytes instead of 16 bytes) is
403 		 * needed if GCM256 (stronger encryption) negotiated
404 		 */
405 		case CIFS_DUMP_FULL_KEY:
406 			if (pSMBFile == NULL)
407 				break;
408 			if (!capable(CAP_SYS_ADMIN)) {
409 				rc = -EACCES;
410 				break;
411 			}
412 			tcon = tlink_tcon(pSMBFile->tlink);
413 			rc = cifs_dump_full_key(tcon, arg);
414 
415 			break;
416 		case CIFS_IOC_NOTIFY:
417 			if (!S_ISDIR(inode->i_mode)) {
418 				/* Notify can only be done on directories */
419 				rc = -EOPNOTSUPP;
420 				break;
421 			}
422 			cifs_sb = CIFS_SB(inode->i_sb);
423 			tlink = cifs_sb_tlink(cifs_sb);
424 			if (IS_ERR(tlink)) {
425 				rc = PTR_ERR(tlink);
426 				break;
427 			}
428 			tcon = tlink_tcon(tlink);
429 			if (tcon && tcon->ses->server->ops->notify) {
430 				rc = tcon->ses->server->ops->notify(xid,
431 						filep, (void __user *)arg);
432 				cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
433 			} else
434 				rc = -EOPNOTSUPP;
435 			cifs_put_tlink(tlink);
436 			break;
437 		case CIFS_IOC_SHUTDOWN:
438 			rc = cifs_shutdown(inode->i_sb, arg);
439 			break;
440 		default:
441 			cifs_dbg(FYI, "unsupported ioctl\n");
442 			break;
443 	}
444 cifs_ioc_exit:
445 	free_xid(xid);
446 	return rc;
447 }
448