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503 lines
13 KiB
503 lines
13 KiB
// SPDX-License-Identifier: LGPL-2.1 |
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/* |
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* |
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* vfs operations that deal with io control |
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* |
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* Copyright (C) International Business Machines Corp., 2005,2013 |
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* Author(s): Steve French ([email protected]) |
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* |
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*/ |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/mount.h> |
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#include <linux/mm.h> |
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#include <linux/pagemap.h> |
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#include "cifspdu.h" |
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#include "cifsglob.h" |
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#include "cifsproto.h" |
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#include "cifs_debug.h" |
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#include "cifsfs.h" |
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#include "cifs_ioctl.h" |
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#include "smb2proto.h" |
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#include "smb2glob.h" |
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#include <linux/btrfs.h> |
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static long cifs_ioctl_query_info(unsigned int xid, struct file *filep, |
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unsigned long p) |
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{ |
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struct inode *inode = file_inode(filep); |
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struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
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struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
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struct dentry *dentry = filep->f_path.dentry; |
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const unsigned char *path; |
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void *page = alloc_dentry_path(); |
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__le16 *utf16_path = NULL, root_path; |
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int rc = 0; |
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path = build_path_from_dentry(dentry, page); |
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if (IS_ERR(path)) { |
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free_dentry_path(page); |
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return PTR_ERR(path); |
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} |
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cifs_dbg(FYI, "%s %s\n", __func__, path); |
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if (!path[0]) { |
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root_path = 0; |
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utf16_path = &root_path; |
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} else { |
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utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb); |
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if (!utf16_path) { |
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rc = -ENOMEM; |
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goto ici_exit; |
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} |
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} |
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if (tcon->ses->server->ops->ioctl_query_info) |
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rc = tcon->ses->server->ops->ioctl_query_info( |
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xid, tcon, cifs_sb, utf16_path, |
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filep->private_data ? 0 : 1, p); |
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else |
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rc = -EOPNOTSUPP; |
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ici_exit: |
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if (utf16_path != &root_path) |
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kfree(utf16_path); |
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free_dentry_path(page); |
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return rc; |
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} |
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static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file, |
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unsigned long srcfd) |
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{ |
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int rc; |
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struct fd src_file; |
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struct inode *src_inode; |
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cifs_dbg(FYI, "ioctl copychunk range\n"); |
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/* the destination must be opened for writing */ |
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if (!(dst_file->f_mode & FMODE_WRITE)) { |
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cifs_dbg(FYI, "file target not open for write\n"); |
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return -EINVAL; |
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} |
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/* check if target volume is readonly and take reference */ |
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rc = mnt_want_write_file(dst_file); |
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if (rc) { |
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cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc); |
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return rc; |
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} |
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src_file = fdget(srcfd); |
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if (!src_file.file) { |
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rc = -EBADF; |
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goto out_drop_write; |
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} |
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if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) { |
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rc = -EBADF; |
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cifs_dbg(VFS, "src file seems to be from a different filesystem type\n"); |
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goto out_fput; |
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} |
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src_inode = file_inode(src_file.file); |
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rc = -EINVAL; |
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if (S_ISDIR(src_inode->i_mode)) |
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goto out_fput; |
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rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0, |
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src_inode->i_size, 0); |
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if (rc > 0) |
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rc = 0; |
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out_fput: |
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fdput(src_file); |
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out_drop_write: |
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mnt_drop_write_file(dst_file); |
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return rc; |
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} |
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static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon, |
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void __user *arg) |
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{ |
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int rc = 0; |
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struct smb_mnt_fs_info *fsinf; |
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fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL); |
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if (fsinf == NULL) |
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return -ENOMEM; |
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fsinf->version = 1; |
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fsinf->protocol_id = tcon->ses->server->vals->protocol_id; |
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fsinf->device_characteristics = |
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le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics); |
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fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType); |
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fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes); |
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fsinf->max_path_component = |
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le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); |
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fsinf->vol_serial_number = tcon->vol_serial_number; |
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fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time); |
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fsinf->share_flags = tcon->share_flags; |
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fsinf->share_caps = le32_to_cpu(tcon->capabilities); |
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fsinf->sector_flags = tcon->ss_flags; |
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fsinf->optimal_sector_size = tcon->perf_sector_size; |
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fsinf->max_bytes_chunk = tcon->max_bytes_chunk; |
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fsinf->maximal_access = tcon->maximal_access; |
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fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability); |
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if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info))) |
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rc = -EFAULT; |
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kfree(fsinf); |
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return rc; |
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} |
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static int cifs_shutdown(struct super_block *sb, unsigned long arg) |
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{ |
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struct cifs_sb_info *sbi = CIFS_SB(sb); |
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__u32 flags; |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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if (get_user(flags, (__u32 __user *)arg)) |
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return -EFAULT; |
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if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) |
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return -EINVAL; |
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if (cifs_forced_shutdown(sbi)) |
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return 0; |
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cifs_dbg(VFS, "shut down requested (%d)", flags); |
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/* trace_cifs_shutdown(sb, flags);*/ |
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/* |
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* see: |
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* https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html |
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* for more information and description of original intent of the flags |
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*/ |
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switch (flags) { |
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/* |
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* We could add support later for default flag which requires: |
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* "Flush all dirty data and metadata to disk" |
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* would need to call syncfs or equivalent to flush page cache for |
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* the mount and then issue fsync to server (if nostrictsync not set) |
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*/ |
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case CIFS_GOING_FLAGS_DEFAULT: |
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cifs_dbg(FYI, "shutdown with default flag not supported\n"); |
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return -EINVAL; |
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/* |
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* FLAGS_LOGFLUSH is easy since it asks to write out metadata (not |
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* data) but metadata writes are not cached on the client, so can treat |
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* it similarly to NOLOGFLUSH |
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*/ |
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case CIFS_GOING_FLAGS_LOGFLUSH: |
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case CIFS_GOING_FLAGS_NOLOGFLUSH: |
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sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; |
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return 0; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) |
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{ |
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struct smb3_full_key_debug_info out; |
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struct cifs_ses *ses; |
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int rc = 0; |
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bool found = false; |
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u8 __user *end; |
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if (!smb3_encryption_required(tcon)) { |
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rc = -EOPNOTSUPP; |
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goto out; |
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} |
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/* copy user input into our output buffer */ |
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if (copy_from_user(&out, in, sizeof(out))) { |
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rc = -EINVAL; |
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goto out; |
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} |
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if (!out.session_id) { |
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/* if ses id is 0, use current user session */ |
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ses = tcon->ses; |
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} else { |
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/* otherwise if a session id is given, look for it in all our sessions */ |
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struct cifs_ses *ses_it = NULL; |
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struct TCP_Server_Info *server_it = NULL; |
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spin_lock(&cifs_tcp_ses_lock); |
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list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { |
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list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { |
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if (ses_it->Suid == out.session_id) { |
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ses = ses_it; |
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/* |
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* since we are using the session outside the crit |
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* section, we need to make sure it won't be released |
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* so increment its refcount |
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*/ |
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ses->ses_count++; |
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found = true; |
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goto search_end; |
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} |
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} |
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} |
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search_end: |
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spin_unlock(&cifs_tcp_ses_lock); |
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if (!found) { |
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rc = -ENOENT; |
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goto out; |
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} |
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} |
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switch (ses->server->cipher_type) { |
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case SMB2_ENCRYPTION_AES128_CCM: |
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case SMB2_ENCRYPTION_AES128_GCM: |
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out.session_key_length = CIFS_SESS_KEY_SIZE; |
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out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; |
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break; |
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case SMB2_ENCRYPTION_AES256_CCM: |
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case SMB2_ENCRYPTION_AES256_GCM: |
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out.session_key_length = CIFS_SESS_KEY_SIZE; |
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out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; |
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break; |
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default: |
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rc = -EOPNOTSUPP; |
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goto out; |
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} |
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/* check if user buffer is big enough to store all the keys */ |
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if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length |
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+ out.server_out_key_length) { |
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rc = -ENOBUFS; |
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goto out; |
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} |
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out.session_id = ses->Suid; |
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out.cipher_type = le16_to_cpu(ses->server->cipher_type); |
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/* overwrite user input with our output */ |
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if (copy_to_user(in, &out, sizeof(out))) { |
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rc = -EINVAL; |
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goto out; |
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} |
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/* append all the keys at the end of the user buffer */ |
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end = in->data; |
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if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { |
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rc = -EINVAL; |
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goto out; |
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} |
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end += out.session_key_length; |
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if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { |
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rc = -EINVAL; |
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goto out; |
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} |
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end += out.server_in_key_length; |
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if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { |
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rc = -EINVAL; |
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goto out; |
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} |
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out: |
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if (found) |
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cifs_put_smb_ses(ses); |
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return rc; |
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} |
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long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) |
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{ |
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struct inode *inode = file_inode(filep); |
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struct smb3_key_debug_info pkey_inf; |
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int rc = -ENOTTY; /* strange error - but the precedent */ |
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unsigned int xid; |
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struct cifsFileInfo *pSMBFile = filep->private_data; |
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struct cifs_tcon *tcon; |
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struct tcon_link *tlink; |
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struct cifs_sb_info *cifs_sb; |
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__u64 ExtAttrBits = 0; |
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__u64 caps; |
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xid = get_xid(); |
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cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); |
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switch (command) { |
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case FS_IOC_GETFLAGS: |
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if (pSMBFile == NULL) |
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break; |
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tcon = tlink_tcon(pSMBFile->tlink); |
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caps = le64_to_cpu(tcon->fsUnixInfo.Capability); |
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#ifdef CONFIG_CIFS_POSIX |
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#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
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if (CIFS_UNIX_EXTATTR_CAP & caps) { |
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__u64 ExtAttrMask = 0; |
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rc = CIFSGetExtAttr(xid, tcon, |
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pSMBFile->fid.netfid, |
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&ExtAttrBits, &ExtAttrMask); |
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if (rc == 0) |
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rc = put_user(ExtAttrBits & |
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FS_FL_USER_VISIBLE, |
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(int __user *)arg); |
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if (rc != EOPNOTSUPP) |
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break; |
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} |
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#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
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#endif /* CONFIG_CIFS_POSIX */ |
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rc = 0; |
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if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { |
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/* add in the compressed bit */ |
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ExtAttrBits = FS_COMPR_FL; |
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rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, |
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(int __user *)arg); |
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} |
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break; |
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case FS_IOC_SETFLAGS: |
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if (pSMBFile == NULL) |
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break; |
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tcon = tlink_tcon(pSMBFile->tlink); |
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/* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ |
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if (get_user(ExtAttrBits, (int __user *)arg)) { |
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rc = -EFAULT; |
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break; |
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} |
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/* |
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* if (CIFS_UNIX_EXTATTR_CAP & caps) |
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* rc = CIFSSetExtAttr(xid, tcon, |
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* pSMBFile->fid.netfid, |
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* extAttrBits, |
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* &ExtAttrMask); |
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* if (rc != EOPNOTSUPP) |
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* break; |
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*/ |
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/* Currently only flag we can set is compressed flag */ |
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if ((ExtAttrBits & FS_COMPR_FL) == 0) |
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break; |
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/* Try to set compress flag */ |
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if (tcon->ses->server->ops->set_compression) { |
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rc = tcon->ses->server->ops->set_compression( |
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xid, tcon, pSMBFile); |
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cifs_dbg(FYI, "set compress flag rc %d\n", rc); |
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} |
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break; |
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case CIFS_IOC_COPYCHUNK_FILE: |
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rc = cifs_ioctl_copychunk(xid, filep, arg); |
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break; |
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case CIFS_QUERY_INFO: |
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rc = cifs_ioctl_query_info(xid, filep, arg); |
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break; |
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case CIFS_IOC_SET_INTEGRITY: |
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if (pSMBFile == NULL) |
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break; |
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tcon = tlink_tcon(pSMBFile->tlink); |
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if (tcon->ses->server->ops->set_integrity) |
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rc = tcon->ses->server->ops->set_integrity(xid, |
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tcon, pSMBFile); |
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else |
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rc = -EOPNOTSUPP; |
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break; |
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case CIFS_IOC_GET_MNT_INFO: |
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if (pSMBFile == NULL) |
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break; |
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tcon = tlink_tcon(pSMBFile->tlink); |
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rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); |
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break; |
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case CIFS_ENUMERATE_SNAPSHOTS: |
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if (pSMBFile == NULL) |
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break; |
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if (arg == 0) { |
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rc = -EINVAL; |
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goto cifs_ioc_exit; |
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} |
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tcon = tlink_tcon(pSMBFile->tlink); |
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if (tcon->ses->server->ops->enum_snapshots) |
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rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, |
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pSMBFile, (void __user *)arg); |
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else |
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rc = -EOPNOTSUPP; |
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break; |
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case CIFS_DUMP_KEY: |
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/* |
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* Dump encryption keys. This is an old ioctl that only |
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* handles AES-128-{CCM,GCM}. |
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*/ |
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if (pSMBFile == NULL) |
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break; |
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if (!capable(CAP_SYS_ADMIN)) { |
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rc = -EACCES; |
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break; |
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} |
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tcon = tlink_tcon(pSMBFile->tlink); |
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if (!smb3_encryption_required(tcon)) { |
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rc = -EOPNOTSUPP; |
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break; |
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} |
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pkey_inf.cipher_type = |
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le16_to_cpu(tcon->ses->server->cipher_type); |
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pkey_inf.Suid = tcon->ses->Suid; |
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memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, |
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16 /* SMB2_NTLMV2_SESSKEY_SIZE */); |
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memcpy(pkey_inf.smb3decryptionkey, |
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tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); |
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memcpy(pkey_inf.smb3encryptionkey, |
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tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); |
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if (copy_to_user((void __user *)arg, &pkey_inf, |
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sizeof(struct smb3_key_debug_info))) |
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rc = -EFAULT; |
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else |
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rc = 0; |
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break; |
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case CIFS_DUMP_FULL_KEY: |
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/* |
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* Dump encryption keys (handles any key sizes) |
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*/ |
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if (pSMBFile == NULL) |
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break; |
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if (!capable(CAP_SYS_ADMIN)) { |
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rc = -EACCES; |
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break; |
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} |
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tcon = tlink_tcon(pSMBFile->tlink); |
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rc = cifs_dump_full_key(tcon, (void __user *)arg); |
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break; |
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case CIFS_IOC_NOTIFY: |
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if (!S_ISDIR(inode->i_mode)) { |
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/* Notify can only be done on directories */ |
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rc = -EOPNOTSUPP; |
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break; |
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} |
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cifs_sb = CIFS_SB(inode->i_sb); |
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tlink = cifs_sb_tlink(cifs_sb); |
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if (IS_ERR(tlink)) { |
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rc = PTR_ERR(tlink); |
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break; |
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} |
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tcon = tlink_tcon(tlink); |
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if (tcon && tcon->ses->server->ops->notify) { |
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rc = tcon->ses->server->ops->notify(xid, |
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filep, (void __user *)arg); |
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cifs_dbg(FYI, "ioctl notify rc %d\n", rc); |
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} else |
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rc = -EOPNOTSUPP; |
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cifs_put_tlink(tlink); |
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break; |
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case CIFS_IOC_SHUTDOWN: |
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rc = cifs_shutdown(inode->i_sb, arg); |
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break; |
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default: |
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cifs_dbg(FYI, "unsupported ioctl\n"); |
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break; |
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} |
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cifs_ioc_exit: |
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free_xid(xid); |
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return rc; |
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}
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