fs/cifs/ioctl.c

   1 /*
   2  *   fs/cifs/ioctl.c
   3  *
   4  *   vfs operations that deal with io control
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2005,2013
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/fs.h>
  25 #include <linux/file.h>
  26 #include <linux/mount.h>
  27 #include <linux/mm.h>
  28 #include <linux/pagemap.h>
  29 #include "cifspdu.h"
  30 #include "cifsglob.h"
  31 #include "cifsproto.h"
  32 #include "cifs_debug.h"
  33 #include "cifsfs.h"
  34 #include "cifs_ioctl.h"
  35 #include "smb2proto.h"
  36 #include <linux/btrfs.h>
  37
  38 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
  39                                   unsigned long p)
  40 {
  41         struct inode *inode = file_inode(filep);
  42         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  43         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
  44         struct dentry *dentry = filep->f_path.dentry;
  45         const unsigned char *path;
  46         void *page = alloc_dentry_path();
  47         __le16 *utf16_path = NULL, root_path;
  48         int rc = 0;
  49
  50         path = build_path_from_dentry(dentry, page);
  51         if (IS_ERR(path)) {
  52                 free_dentry_path(page);
  53                 return PTR_ERR(path);
  54         }
  55
  56         cifs_dbg(FYI, "%s %s\n", __func__, path);
  57
  58         if (!path[0]) {
  59                 root_path = 0;
  60                 utf16_path = &root_path;
  61         } else {
  62                 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
  63                 if (!utf16_path) {
  64                         rc = -ENOMEM;
  65                         goto ici_exit;
  66                 }
  67         }
  68
  69         if (tcon->ses->server->ops->ioctl_query_info)
  70                 rc = tcon->ses->server->ops->ioctl_query_info(
  71                                 xid, tcon, cifs_sb, utf16_path,
  72                                 filep->private_data ? 0 : 1, p);
  73         else
  74                 rc = -EOPNOTSUPP;
  75
  76  ici_exit:
  77         if (utf16_path != &root_path)
  78                 kfree(utf16_path);
  79         free_dentry_path(page);
  80         return rc;
  81 }
  82
  83 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
  84                         unsigned long srcfd)
  85 {
  86         int rc;
  87         struct fd src_file;
  88         struct inode *src_inode;
  89
  90         cifs_dbg(FYI, "ioctl copychunk range\n");
  91         /* the destination must be opened for writing */
  92         if (!(dst_file->f_mode & FMODE_WRITE)) {
  93                 cifs_dbg(FYI, "file target not open for write\n");
  94                 return -EINVAL;
  95         }
  96
  97         /* check if target volume is readonly and take reference */
  98         rc = mnt_want_write_file(dst_file);
  99         if (rc) {
 100                 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
 101                 return rc;
 102         }
 103
 104         src_file = fdget(srcfd);
 105         if (!src_file.file) {
 106                 rc = -EBADF;
 107                 goto out_drop_write;
 108         }
 109
 110         if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
 111                 rc = -EBADF;
 112                 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
 113                 goto out_fput;
 114         }
 115
 116         src_inode = file_inode(src_file.file);
 117         rc = -EINVAL;
 118         if (S_ISDIR(src_inode->i_mode))
 119                 goto out_fput;
 120
 121         rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
 122                                         src_inode->i_size, 0);
 123         if (rc > 0)
 124                 rc = 0;
 125 out_fput:
 126         fdput(src_file);
 127 out_drop_write:
 128         mnt_drop_write_file(dst_file);
 129         return rc;
 130 }
 131
 132 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 133                                 void __user *arg)
 134 {
 135         int rc = 0;
 136         struct smb_mnt_fs_info *fsinf;
 137
 138         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 139         if (fsinf == NULL)
 140                 return -ENOMEM;
 141
 142         fsinf->version = 1;
 143         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 144         fsinf->device_characteristics =
 145                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 146         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 147         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 148         fsinf->max_path_component =
 149                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 150         fsinf->vol_serial_number = tcon->vol_serial_number;
 151         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 152         fsinf->share_flags = tcon->share_flags;
 153         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 154         fsinf->sector_flags = tcon->ss_flags;
 155         fsinf->optimal_sector_size = tcon->perf_sector_size;
 156         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 157         fsinf->maximal_access = tcon->maximal_access;
 158         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 159
 160         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 161                 rc = -EFAULT;
 162
 163         kfree(fsinf);
 164         return rc;
 165 }
 166
 167 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
 168 {
 169         struct cifs_sb_info *sbi = CIFS_SB(sb);
 170         __u32 flags;
 171
 172         if (!capable(CAP_SYS_ADMIN))
 173                 return -EPERM;
 174
 175         if (get_user(flags, (__u32 __user *)arg))
 176                 return -EFAULT;
 177
 178         if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
 179                 return -EINVAL;
 180
 181         if (cifs_forced_shutdown(sbi))
 182                 return 0;
 183
 184         cifs_dbg(VFS, "shut down requested (%d)", flags);
 185 /*      trace_cifs_shutdown(sb, flags);*/
 186
 187         /*
 188          * see:
 189          *   https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
 190          * for more information and description of original intent of the flags
 191          */
 192         switch (flags) {
 193         /*
 194          * We could add support later for default flag which requires:
 195          *     "Flush all dirty data and metadata to disk"
 196          * would need to call syncfs or equivalent to flush page cache for
 197          * the mount and then issue fsync to server (if nostrictsync not set)
 198          */
 199         case CIFS_GOING_FLAGS_DEFAULT:
 200                 cifs_dbg(FYI, "shutdown with default flag not supported\n");
 201                 return -EINVAL;
 202         /*
 203          * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
 204          * data) but metadata writes are not cached on the client, so can treat
 205          * it similarly to NOLOGFLUSH
 206          */
 207         case CIFS_GOING_FLAGS_LOGFLUSH:
 208         case CIFS_GOING_FLAGS_NOLOGFLUSH:
 209                 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
 210                 return 0;
 211         default:
 212                 return -EINVAL;
 213         }
 214         return 0;
 215 }
 216
 217 static int cifs_dump_full_key(struct cifs_tcon *tcon, unsigned long arg)
 218 {
 219         struct smb3_full_key_debug_info pfull_key_inf;
 220         __u64 suid;
 221         struct list_head *tmp;
 222         struct cifs_ses *ses;
 223         bool found = false;
 224
 225         if (!smb3_encryption_required(tcon))
 226                 return -EOPNOTSUPP;
 227
 228         ses = tcon->ses; /* default to user id for current user */
 229         if (get_user(suid, (__u64 __user *)arg))
 230                 suid = 0;
 231         if (suid) {
 232                 /* search to see if there is a session with a matching SMB UID */
 233                 spin_lock(&cifs_tcp_ses_lock);
 234                 list_for_each(tmp, &tcon->ses->server->smb_ses_list) {
 235                         ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 236                         if (ses->Suid == suid) {
 237                                 found = true;
 238                                 break;
 239                         }
 240                 }
 241                 spin_unlock(&cifs_tcp_ses_lock);
 242                 if (found == false)
 243                         return -EINVAL;
 244         } /* else uses default user's SMB UID (ie current user) */
 245
 246         pfull_key_inf.cipher_type = le16_to_cpu(ses->server->cipher_type);
 247         pfull_key_inf.Suid = ses->Suid;
 248         memcpy(pfull_key_inf.auth_key, ses->auth_key.response,
 249                16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
 250         memcpy(pfull_key_inf.smb3decryptionkey, ses->smb3decryptionkey,
 251                32 /* SMB3_ENC_DEC_KEY_SIZE */);
 252         memcpy(pfull_key_inf.smb3encryptionkey,
 253                ses->smb3encryptionkey, 32 /* SMB3_ENC_DEC_KEY_SIZE */);
 254         if (copy_to_user((void __user *)arg, &pfull_key_inf,
 255                          sizeof(struct smb3_full_key_debug_info)))
 256                 return -EFAULT;
 257
 258         return 0;
 259 }
 260
 261 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 262 {
 263         struct inode *inode = file_inode(filep);
 264         struct smb3_key_debug_info pkey_inf;
 265         int rc = -ENOTTY; /* strange error - but the precedent */
 266         unsigned int xid;
 267         struct cifsFileInfo *pSMBFile = filep->private_data;
 268         struct cifs_tcon *tcon;
 269         struct tcon_link *tlink;
 270         struct cifs_sb_info *cifs_sb;
 271         __u64   ExtAttrBits = 0;
 272         __u64   caps;
 273
 274         xid = get_xid();
 275
 276         cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
 277         switch (command) {
 278                 case FS_IOC_GETFLAGS:
 279                         if (pSMBFile == NULL)
 280                                 break;
 281                         tcon = tlink_tcon(pSMBFile->tlink);
 282                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 283 #ifdef CONFIG_CIFS_POSIX
 284                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
 285                                 __u64   ExtAttrMask = 0;
 286                                 rc = CIFSGetExtAttr(xid, tcon,
 287                                                     pSMBFile->fid.netfid,
 288                                                     &ExtAttrBits, &ExtAttrMask);
 289                                 if (rc == 0)
 290                                         rc = put_user(ExtAttrBits &
 291                                                 FS_FL_USER_VISIBLE,
 292                                                 (int __user *)arg);
 293                                 if (rc != EOPNOTSUPP)
 294                                         break;
 295                         }
 296 #endif /* CONFIG_CIFS_POSIX */
 297                         rc = 0;
 298                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 299                                 /* add in the compressed bit */
 300                                 ExtAttrBits = FS_COMPR_FL;
 301                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 302                                               (int __user *)arg);
 303                         }
 304                         break;
 305                 case FS_IOC_SETFLAGS:
 306                         if (pSMBFile == NULL)
 307                                 break;
 308                         tcon = tlink_tcon(pSMBFile->tlink);
 309                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 310
 311                         if (get_user(ExtAttrBits, (int __user *)arg)) {
 312                                 rc = -EFAULT;
 313                                 break;
 314                         }
 315
 316                         /*
 317                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
 318                          *      rc = CIFSSetExtAttr(xid, tcon,
 319                          *                     pSMBFile->fid.netfid,
 320                          *                     extAttrBits,
 321                          *                     &ExtAttrMask);
 322                          * if (rc != EOPNOTSUPP)
 323                          *      break;
 324                          */
 325
 326                         /* Currently only flag we can set is compressed flag */
 327                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
 328                                 break;
 329
 330                         /* Try to set compress flag */
 331                         if (tcon->ses->server->ops->set_compression) {
 332                                 rc = tcon->ses->server->ops->set_compression(
 333                                                         xid, tcon, pSMBFile);
 334                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 335                         }
 336                         break;
 337                 case CIFS_IOC_COPYCHUNK_FILE:
 338                         rc = cifs_ioctl_copychunk(xid, filep, arg);
 339                         break;
 340                 case CIFS_QUERY_INFO:
 341                         rc = cifs_ioctl_query_info(xid, filep, arg);
 342                         break;
 343                 case CIFS_IOC_SET_INTEGRITY:
 344                         if (pSMBFile == NULL)
 345                                 break;
 346                         tcon = tlink_tcon(pSMBFile->tlink);
 347                         if (tcon->ses->server->ops->set_integrity)
 348                                 rc = tcon->ses->server->ops->set_integrity(xid,
 349                                                 tcon, pSMBFile);
 350                         else
 351                                 rc = -EOPNOTSUPP;
 352                         break;
 353                 case CIFS_IOC_GET_MNT_INFO:
 354                         if (pSMBFile == NULL)
 355                                 break;
 356                         tcon = tlink_tcon(pSMBFile->tlink);
 357                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 358                         break;
 359                 case CIFS_ENUMERATE_SNAPSHOTS:
 360                         if (pSMBFile == NULL)
 361                                 break;
 362                         if (arg == 0) {
 363                                 rc = -EINVAL;
 364                                 goto cifs_ioc_exit;
 365                         }
 366                         tcon = tlink_tcon(pSMBFile->tlink);
 367                         if (tcon->ses->server->ops->enum_snapshots)
 368                                 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
 369                                                 pSMBFile, (void __user *)arg);
 370                         else
 371                                 rc = -EOPNOTSUPP;
 372                         break;
 373                 case CIFS_DUMP_KEY:
 374                         if (pSMBFile == NULL)
 375                                 break;
 376                         if (!capable(CAP_SYS_ADMIN)) {
 377                                 rc = -EACCES;
 378                                 break;
 379                         }
 380
 381                         tcon = tlink_tcon(pSMBFile->tlink);
 382                         if (!smb3_encryption_required(tcon)) {
 383                                 rc = -EOPNOTSUPP;
 384                                 break;
 385                         }
 386                         pkey_inf.cipher_type =
 387                                 le16_to_cpu(tcon->ses->server->cipher_type);
 388                         pkey_inf.Suid = tcon->ses->Suid;
 389                         memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
 390                                         16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
 391                         memcpy(pkey_inf.smb3decryptionkey,
 392                               tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
 393                         memcpy(pkey_inf.smb3encryptionkey,
 394                               tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
 395                         if (copy_to_user((void __user *)arg, &pkey_inf,
 396                                         sizeof(struct smb3_key_debug_info)))
 397                                 rc = -EFAULT;
 398                         else
 399                                 rc = 0;
 400                         break;
 401                 /*
 402                  * Dump full key (32 bytes instead of 16 bytes) is
 403                  * needed if GCM256 (stronger encryption) negotiated
 404                  */
 405                 case CIFS_DUMP_FULL_KEY:
 406                         if (pSMBFile == NULL)
 407                                 break;
 408                         if (!capable(CAP_SYS_ADMIN)) {
 409                                 rc = -EACCES;
 410                                 break;
 411                         }
 412                         tcon = tlink_tcon(pSMBFile->tlink);
 413                         rc = cifs_dump_full_key(tcon, arg);
 414
 415                         break;
 416                 case CIFS_IOC_NOTIFY:
 417                         if (!S_ISDIR(inode->i_mode)) {
 418                                 /* Notify can only be done on directories */
 419                                 rc = -EOPNOTSUPP;
 420                                 break;
 421                         }
 422                         cifs_sb = CIFS_SB(inode->i_sb);
 423                         tlink = cifs_sb_tlink(cifs_sb);
 424                         if (IS_ERR(tlink)) {
 425                                 rc = PTR_ERR(tlink);
 426                                 break;
 427                         }
 428                         tcon = tlink_tcon(tlink);
 429                         if (tcon && tcon->ses->server->ops->notify) {
 430                                 rc = tcon->ses->server->ops->notify(xid,
 431                                                 filep, (void __user *)arg);
 432                                 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
 433                         } else
 434                                 rc = -EOPNOTSUPP;
 435                         cifs_put_tlink(tlink);
 436                         break;
 437                 case CIFS_IOC_SHUTDOWN:
 438                         rc = cifs_shutdown(inode->i_sb, arg);
 439                         break;
 440                 default:
 441                         cifs_dbg(FYI, "unsupported ioctl\n");
 442                         break;
 443         }
 444 cifs_ioc_exit:
 445         free_xid(xid);
 446         return rc;
 447 }