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  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
 26static 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
 71static 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;
113out_fput:
114	fdput(src_file);
115out_drop_write:
116	mnt_drop_write_file(dst_file);
117	return rc;
118}
119
120static 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
155static 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
205static 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					ses->ses_count++;
243					found = true;
244					goto search_end;
245				}
246			}
247		}
248search_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
307out:
308	if (found)
309		cifs_put_smb_ses(ses);
310	return rc;
311}
312
313long 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	__u64   caps;
325
326	xid = get_xid();
327
328	cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
329	switch (command) {
330		case FS_IOC_GETFLAGS:
331			if (pSMBFile == NULL)
332				break;
333			tcon = tlink_tcon(pSMBFile->tlink);
334			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
335#ifdef CONFIG_CIFS_POSIX
336#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
337			if (CIFS_UNIX_EXTATTR_CAP & caps) {
338				__u64	ExtAttrMask = 0;
339				rc = CIFSGetExtAttr(xid, tcon,
340						    pSMBFile->fid.netfid,
341						    &ExtAttrBits, &ExtAttrMask);
342				if (rc == 0)
343					rc = put_user(ExtAttrBits &
344						FS_FL_USER_VISIBLE,
345						(int __user *)arg);
346				if (rc != -EOPNOTSUPP)
347					break;
348			}
349#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
350#endif /* CONFIG_CIFS_POSIX */
351			rc = 0;
352			if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
353				/* add in the compressed bit */
354				ExtAttrBits = FS_COMPR_FL;
355				rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
356					      (int __user *)arg);
357			}
358			break;
359		case FS_IOC_SETFLAGS:
360			if (pSMBFile == NULL)
361				break;
362			tcon = tlink_tcon(pSMBFile->tlink);
363			/* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */
364
365			if (get_user(ExtAttrBits, (int __user *)arg)) {
366				rc = -EFAULT;
367				break;
368			}
369
370			/*
371			 * if (CIFS_UNIX_EXTATTR_CAP & caps)
372			 *	rc = CIFSSetExtAttr(xid, tcon,
373			 *		       pSMBFile->fid.netfid,
374			 *		       extAttrBits,
375			 *		       &ExtAttrMask);
376			 * if (rc != -EOPNOTSUPP)
377			 *	break;
378			 */
379
380			/* Currently only flag we can set is compressed flag */
381			if ((ExtAttrBits & FS_COMPR_FL) == 0)
382				break;
383
384			/* Try to set compress flag */
385			if (tcon->ses->server->ops->set_compression) {
386				rc = tcon->ses->server->ops->set_compression(
387							xid, tcon, pSMBFile);
388				cifs_dbg(FYI, "set compress flag rc %d\n", rc);
389			}
390			break;
391		case CIFS_IOC_COPYCHUNK_FILE:
392			rc = cifs_ioctl_copychunk(xid, filep, arg);
393			break;
394		case CIFS_QUERY_INFO:
395			rc = cifs_ioctl_query_info(xid, filep, arg);
396			break;
397		case CIFS_IOC_SET_INTEGRITY:
398			if (pSMBFile == NULL)
399				break;
400			tcon = tlink_tcon(pSMBFile->tlink);
401			if (tcon->ses->server->ops->set_integrity)
402				rc = tcon->ses->server->ops->set_integrity(xid,
403						tcon, pSMBFile);
404			else
405				rc = -EOPNOTSUPP;
406			break;
407		case CIFS_IOC_GET_MNT_INFO:
408			if (pSMBFile == NULL)
409				break;
410			tcon = tlink_tcon(pSMBFile->tlink);
411			rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
412			break;
413		case CIFS_ENUMERATE_SNAPSHOTS:
414			if (pSMBFile == NULL)
415				break;
416			if (arg == 0) {
417				rc = -EINVAL;
418				goto cifs_ioc_exit;
419			}
420			tcon = tlink_tcon(pSMBFile->tlink);
421			if (tcon->ses->server->ops->enum_snapshots)
422				rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
423						pSMBFile, (void __user *)arg);
424			else
425				rc = -EOPNOTSUPP;
426			break;
427		case CIFS_DUMP_KEY:
428			/*
429			 * Dump encryption keys. This is an old ioctl that only
430			 * handles AES-128-{CCM,GCM}.
431			 */
432			if (pSMBFile == NULL)
433				break;
434			if (!capable(CAP_SYS_ADMIN)) {
435				rc = -EACCES;
436				break;
437			}
438
439			tcon = tlink_tcon(pSMBFile->tlink);
440			if (!smb3_encryption_required(tcon)) {
441				rc = -EOPNOTSUPP;
442				break;
443			}
444			pkey_inf.cipher_type =
445				le16_to_cpu(tcon->ses->server->cipher_type);
446			pkey_inf.Suid = tcon->ses->Suid;
447			memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
448					16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
449			memcpy(pkey_inf.smb3decryptionkey,
450			      tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
451			memcpy(pkey_inf.smb3encryptionkey,
452			      tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
453			if (copy_to_user((void __user *)arg, &pkey_inf,
454					sizeof(struct smb3_key_debug_info)))
455				rc = -EFAULT;
456			else
457				rc = 0;
458			break;
459		case CIFS_DUMP_FULL_KEY:
460			/*
461			 * Dump encryption keys (handles any key sizes)
462			 */
463			if (pSMBFile == NULL)
464				break;
465			if (!capable(CAP_SYS_ADMIN)) {
466				rc = -EACCES;
467				break;
468			}
469			tcon = tlink_tcon(pSMBFile->tlink);
470			rc = cifs_dump_full_key(tcon, (void __user *)arg);
471			break;
472		case CIFS_IOC_NOTIFY:
473			if (!S_ISDIR(inode->i_mode)) {
474				/* Notify can only be done on directories */
475				rc = -EOPNOTSUPP;
476				break;
477			}
478			cifs_sb = CIFS_SB(inode->i_sb);
479			tlink = cifs_sb_tlink(cifs_sb);
480			if (IS_ERR(tlink)) {
481				rc = PTR_ERR(tlink);
482				break;
483			}
484			tcon = tlink_tcon(tlink);
485			if (tcon && tcon->ses->server->ops->notify) {
486				rc = tcon->ses->server->ops->notify(xid,
487						filep, (void __user *)arg,
488						false /* no ret data */);
489				cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
490			} else
491				rc = -EOPNOTSUPP;
492			cifs_put_tlink(tlink);
493			break;
494		case CIFS_IOC_NOTIFY_INFO:
495			if (!S_ISDIR(inode->i_mode)) {
496				/* Notify can only be done on directories */
497				rc = -EOPNOTSUPP;
498				break;
499			}
500			cifs_sb = CIFS_SB(inode->i_sb);
501			tlink = cifs_sb_tlink(cifs_sb);
502			if (IS_ERR(tlink)) {
503				rc = PTR_ERR(tlink);
504				break;
505			}
506			tcon = tlink_tcon(tlink);
507			if (tcon && tcon->ses->server->ops->notify) {
508				rc = tcon->ses->server->ops->notify(xid,
509						filep, (void __user *)arg,
510						true /* return details */);
511				cifs_dbg(FYI, "ioctl notify info rc %d\n", rc);
512			} else
513				rc = -EOPNOTSUPP;
514			cifs_put_tlink(tlink);
515			break;
516		case CIFS_IOC_SHUTDOWN:
517			rc = cifs_shutdown(inode->i_sb, arg);
518			break;
519		default:
520			cifs_dbg(FYI, "unsupported ioctl\n");
521			break;
522	}
523cifs_ioc_exit:
524	free_xid(xid);
525	return rc;
526}