1 files changed, 551 insertions, 0 deletions

diff --git a/fs/smb/client/ioctl.c b/fs/smb/client/ioctl.c
new file mode 100644
index 000000000..ae9905e2b
--- /dev/null
+++ b/fs/smb/client/ioctl.c
@@ -0,0 +1,551 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ *
+ *   vfs operations that deal with io control
+ *
+ *   Copyright (C) International Business Machines  Corp., 2005,2013
+ *   Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ */
+
+#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_tcon_info(struct cifs_tcon *tcon, void __user *arg)
+{
+	int rc = 0;
+	struct smb_mnt_tcon_info tcon_inf;
+
+	tcon_inf.tid = tcon->tid;
+	tcon_inf.session_id = tcon->ses->Suid;
+
+	if (copy_to_user(arg, &tcon_inf, sizeof(struct smb_mnt_tcon_info)))
+		rc = -EFAULT;
+
+	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
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+			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_ALLOW_INSECURE_LEGACY */
+#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_IOC_GET_TCON_INFO:
+			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);
+			rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg);
+			cifs_put_tlink(tlink);
+			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,
+						false /* no ret data */);
+				cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
+			} else
+				rc = -EOPNOTSUPP;
+			cifs_put_tlink(tlink);
+			break;
+		case CIFS_IOC_NOTIFY_INFO:
+			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,
+						true /* return details */);
+				cifs_dbg(FYI, "ioctl notify info 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;
+}