527 lines
13 KiB
C
527 lines
13 KiB
C
// 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 (sfrench@us.ibm.com)
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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,
|
|
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;
|
|
}
|