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 "smb2glob.h"
  37 #include <linux/btrfs.h>
  38
  39 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
  40                                   unsigned long p)
  41 {
  42         struct inode *inode = file_inode(filep);
  43         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  44         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
  45         struct dentry *dentry = filep->f_path.dentry;
  46         const unsigned char *path;
  47         void *page = alloc_dentry_path();
  48         __le16 *utf16_path = NULL, root_path;
  49         int rc = 0;
  50
  51         path = build_path_from_dentry(dentry, page);
  52         if (IS_ERR(path)) {
  53                 free_dentry_path(page);
  54                 return PTR_ERR(path);
  55         }
  56
  57         cifs_dbg(FYI, "%s %s\n", __func__, path);
  58
  59         if (!path[0]) {
  60                 root_path = 0;
  61                 utf16_path = &root_path;
  62         } else {
  63                 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
  64                 if (!utf16_path) {
  65                         rc = -ENOMEM;
  66                         goto ici_exit;
  67                 }
  68         }
  69
  70         if (tcon->ses->server->ops->ioctl_query_info)
  71                 rc = tcon->ses->server->ops->ioctl_query_info(
  72                                 xid, tcon, cifs_sb, utf16_path,
  73                                 filep->private_data ? 0 : 1, p);
  74         else
  75                 rc = -EOPNOTSUPP;
  76
  77  ici_exit:
  78         if (utf16_path != &root_path)
  79                 kfree(utf16_path);
  80         free_dentry_path(page);
  81         return rc;
  82 }
  83
  84 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
  85                         unsigned long srcfd)
  86 {
  87         int rc;
  88         struct fd src_file;
  89         struct inode *src_inode;
  90
  91         cifs_dbg(FYI, "ioctl copychunk range\n");
  92         /* the destination must be opened for writing */
  93         if (!(dst_file->f_mode & FMODE_WRITE)) {
  94                 cifs_dbg(FYI, "file target not open for write\n");
  95                 return -EINVAL;
  96         }
  97
  98         /* check if target volume is readonly and take reference */
  99         rc = mnt_want_write_file(dst_file);
 100         if (rc) {
 101                 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
 102                 return rc;
 103         }
 104
 105         src_file = fdget(srcfd);
 106         if (!src_file.file) {
 107                 rc = -EBADF;
 108                 goto out_drop_write;
 109         }
 110
 111         if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
 112                 rc = -EBADF;
 113                 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
 114                 goto out_fput;
 115         }
 116
 117         src_inode = file_inode(src_file.file);
 118         rc = -EINVAL;
 119         if (S_ISDIR(src_inode->i_mode))
 120                 goto out_fput;
 121
 122         rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
 123                                         src_inode->i_size, 0);
 124         if (rc > 0)
 125                 rc = 0;
 126 out_fput:
 127         fdput(src_file);
 128 out_drop_write:
 129         mnt_drop_write_file(dst_file);
 130         return rc;
 131 }
 132
 133 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 134                                 void __user *arg)
 135 {
 136         int rc = 0;
 137         struct smb_mnt_fs_info *fsinf;
 138
 139         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 140         if (fsinf == NULL)
 141                 return -ENOMEM;
 142
 143         fsinf->version = 1;
 144         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 145         fsinf->device_characteristics =
 146                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 147         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 148         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 149         fsinf->max_path_component =
 150                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 151         fsinf->vol_serial_number = tcon->vol_serial_number;
 152         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 153         fsinf->share_flags = tcon->share_flags;
 154         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 155         fsinf->sector_flags = tcon->ss_flags;
 156         fsinf->optimal_sector_size = tcon->perf_sector_size;
 157         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 158         fsinf->maximal_access = tcon->maximal_access;
 159         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 160
 161         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 162                 rc = -EFAULT;
 163
 164         kfree(fsinf);
 165         return rc;
 166 }
 167
 168 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
 169 {
 170         struct cifs_sb_info *sbi = CIFS_SB(sb);
 171         __u32 flags;
 172
 173         if (!capable(CAP_SYS_ADMIN))
 174                 return -EPERM;
 175
 176         if (get_user(flags, (__u32 __user *)arg))
 177                 return -EFAULT;
 178
 179         if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
 180                 return -EINVAL;
 181
 182         if (cifs_forced_shutdown(sbi))
 183                 return 0;
 184
 185         cifs_dbg(VFS, "shut down requested (%d)", flags);
 186 /*      trace_cifs_shutdown(sb, flags);*/
 187
 188         /*
 189          * see:
 190          *   https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
 191          * for more information and description of original intent of the flags
 192          */
 193         switch (flags) {
 194         /*
 195          * We could add support later for default flag which requires:
 196          *     "Flush all dirty data and metadata to disk"
 197          * would need to call syncfs or equivalent to flush page cache for
 198          * the mount and then issue fsync to server (if nostrictsync not set)
 199          */
 200         case CIFS_GOING_FLAGS_DEFAULT:
 201                 cifs_dbg(FYI, "shutdown with default flag not supported\n");
 202                 return -EINVAL;
 203         /*
 204          * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
 205          * data) but metadata writes are not cached on the client, so can treat
 206          * it similarly to NOLOGFLUSH
 207          */
 208         case CIFS_GOING_FLAGS_LOGFLUSH:
 209         case CIFS_GOING_FLAGS_NOLOGFLUSH:
 210                 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
 211                 return 0;
 212         default:
 213                 return -EINVAL;
 214         }
 215         return 0;
 216 }
 217
 218 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
 219 {
 220         struct smb3_full_key_debug_info out;
 221         struct cifs_ses *ses;
 222         int rc = 0;
 223         bool found = false;
 224         u8 __user *end;
 225
 226         if (!smb3_encryption_required(tcon)) {
 227                 rc = -EOPNOTSUPP;
 228                 goto out;
 229         }
 230
 231         /* copy user input into our output buffer */
 232         if (copy_from_user(&out, in, sizeof(out))) {
 233                 rc = -EINVAL;
 234                 goto out;
 235         }
 236
 237         if (!out.session_id) {
 238                 /* if ses id is 0, use current user session */
 239                 ses = tcon->ses;
 240         } else {
 241                 /* otherwise if a session id is given, look for it in all our sessions */
 242                 struct cifs_ses *ses_it = NULL;
 243                 struct TCP_Server_Info *server_it = NULL;
 244
 245                 spin_lock(&cifs_tcp_ses_lock);
 246                 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
 247                         list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
 248                                 if (ses_it->Suid == out.session_id) {
 249                                         ses = ses_it;
 250                                         /*
 251                                          * since we are using the session outside the crit
 252                                          * section, we need to make sure it won't be released
 253                                          * so increment its refcount
 254                                          */
 255                                         ses->ses_count++;
 256                                         found = true;
 257                                         goto search_end;
 258                                 }
 259                         }
 260                 }
 261 search_end:
 262                 spin_unlock(&cifs_tcp_ses_lock);
 263                 if (!found) {
 264                         rc = -ENOENT;
 265                         goto out;
 266                 }
 267         }
 268
 269         switch (ses->server->cipher_type) {
 270         case SMB2_ENCRYPTION_AES128_CCM:
 271         case SMB2_ENCRYPTION_AES128_GCM:
 272                 out.session_key_length = CIFS_SESS_KEY_SIZE;
 273                 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
 274                 break;
 275         case SMB2_ENCRYPTION_AES256_CCM:
 276         case SMB2_ENCRYPTION_AES256_GCM:
 277                 out.session_key_length = CIFS_SESS_KEY_SIZE;
 278                 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
 279                 break;
 280         default:
 281                 rc = -EOPNOTSUPP;
 282                 goto out;
 283         }
 284
 285         /* check if user buffer is big enough to store all the keys */
 286         if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
 287             + out.server_out_key_length) {
 288                 rc = -ENOBUFS;
 289                 goto out;
 290         }
 291
 292         out.session_id = ses->Suid;
 293         out.cipher_type = le16_to_cpu(ses->server->cipher_type);
 294
 295         /* overwrite user input with our output */
 296         if (copy_to_user(in, &out, sizeof(out))) {
 297                 rc = -EINVAL;
 298                 goto out;
 299         }
 300
 301         /* append all the keys at the end of the user buffer */
 302         end = in->data;
 303         if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
 304                 rc = -EINVAL;
 305                 goto out;
 306         }
 307         end += out.session_key_length;
 308
 309         if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
 310                 rc = -EINVAL;
 311                 goto out;
 312         }
 313         end += out.server_in_key_length;
 314
 315         if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
 316                 rc = -EINVAL;
 317                 goto out;
 318         }
 319
 320 out:
 321         if (found)
 322                 cifs_put_smb_ses(ses);
 323         return rc;
 324 }
 325
 326 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 327 {
 328         struct inode *inode = file_inode(filep);
 329         struct smb3_key_debug_info pkey_inf;
 330         int rc = -ENOTTY; /* strange error - but the precedent */
 331         unsigned int xid;
 332         struct cifsFileInfo *pSMBFile = filep->private_data;
 333         struct cifs_tcon *tcon;
 334         struct tcon_link *tlink;
 335         struct cifs_sb_info *cifs_sb;
 336         __u64   ExtAttrBits = 0;
 337         __u64   caps;
 338
 339         xid = get_xid();
 340
 341         cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
 342         switch (command) {
 343                 case FS_IOC_GETFLAGS:
 344                         if (pSMBFile == NULL)
 345                                 break;
 346                         tcon = tlink_tcon(pSMBFile->tlink);
 347                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 348 #ifdef CONFIG_CIFS_POSIX
 349                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
 350                                 __u64   ExtAttrMask = 0;
 351                                 rc = CIFSGetExtAttr(xid, tcon,
 352                                                     pSMBFile->fid.netfid,
 353                                                     &ExtAttrBits, &ExtAttrMask);
 354                                 if (rc == 0)
 355                                         rc = put_user(ExtAttrBits &
 356                                                 FS_FL_USER_VISIBLE,
 357                                                 (int __user *)arg);
 358                                 if (rc != EOPNOTSUPP)
 359                                         break;
 360                         }
 361 #endif /* CONFIG_CIFS_POSIX */
 362                         rc = 0;
 363                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 364                                 /* add in the compressed bit */
 365                                 ExtAttrBits = FS_COMPR_FL;
 366                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 367                                               (int __user *)arg);
 368                         }
 369                         break;
 370                 case FS_IOC_SETFLAGS:
 371                         if (pSMBFile == NULL)
 372                                 break;
 373                         tcon = tlink_tcon(pSMBFile->tlink);
 374                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 375
 376                         if (get_user(ExtAttrBits, (int __user *)arg)) {
 377                                 rc = -EFAULT;
 378                                 break;
 379                         }
 380
 381                         /*
 382                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
 383                          *      rc = CIFSSetExtAttr(xid, tcon,
 384                          *                     pSMBFile->fid.netfid,
 385                          *                     extAttrBits,
 386                          *                     &ExtAttrMask);
 387                          * if (rc != EOPNOTSUPP)
 388                          *      break;
 389                          */
 390
 391                         /* Currently only flag we can set is compressed flag */
 392                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
 393                                 break;
 394
 395                         /* Try to set compress flag */
 396                         if (tcon->ses->server->ops->set_compression) {
 397                                 rc = tcon->ses->server->ops->set_compression(
 398                                                         xid, tcon, pSMBFile);
 399                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 400                         }
 401                         break;
 402                 case CIFS_IOC_COPYCHUNK_FILE:
 403                         rc = cifs_ioctl_copychunk(xid, filep, arg);
 404                         break;
 405                 case CIFS_QUERY_INFO:
 406                         rc = cifs_ioctl_query_info(xid, filep, arg);
 407                         break;
 408                 case CIFS_IOC_SET_INTEGRITY:
 409                         if (pSMBFile == NULL)
 410                                 break;
 411                         tcon = tlink_tcon(pSMBFile->tlink);
 412                         if (tcon->ses->server->ops->set_integrity)
 413                                 rc = tcon->ses->server->ops->set_integrity(xid,
 414                                                 tcon, pSMBFile);
 415                         else
 416                                 rc = -EOPNOTSUPP;
 417                         break;
 418                 case CIFS_IOC_GET_MNT_INFO:
 419                         if (pSMBFile == NULL)
 420                                 break;
 421                         tcon = tlink_tcon(pSMBFile->tlink);
 422                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 423                         break;
 424                 case CIFS_ENUMERATE_SNAPSHOTS:
 425                         if (pSMBFile == NULL)
 426                                 break;
 427                         if (arg == 0) {
 428                                 rc = -EINVAL;
 429                                 goto cifs_ioc_exit;
 430                         }
 431                         tcon = tlink_tcon(pSMBFile->tlink);
 432                         if (tcon->ses->server->ops->enum_snapshots)
 433                                 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
 434                                                 pSMBFile, (void __user *)arg);
 435                         else
 436                                 rc = -EOPNOTSUPP;
 437                         break;
 438                 case CIFS_DUMP_KEY:
 439                         /*
 440                          * Dump encryption keys. This is an old ioctl that only
 441                          * handles AES-128-{CCM,GCM}.
 442                          */
 443                         if (pSMBFile == NULL)
 444                                 break;
 445                         if (!capable(CAP_SYS_ADMIN)) {
 446                                 rc = -EACCES;
 447                                 break;
 448                         }
 449
 450                         tcon = tlink_tcon(pSMBFile->tlink);
 451                         if (!smb3_encryption_required(tcon)) {
 452                                 rc = -EOPNOTSUPP;
 453                                 break;
 454                         }
 455                         pkey_inf.cipher_type =
 456                                 le16_to_cpu(tcon->ses->server->cipher_type);
 457                         pkey_inf.Suid = tcon->ses->Suid;
 458                         memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
 459                                         16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
 460                         memcpy(pkey_inf.smb3decryptionkey,
 461                               tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
 462                         memcpy(pkey_inf.smb3encryptionkey,
 463                               tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
 464                         if (copy_to_user((void __user *)arg, &pkey_inf,
 465                                         sizeof(struct smb3_key_debug_info)))
 466                                 rc = -EFAULT;
 467                         else
 468                                 rc = 0;
 469                         break;
 470                 case CIFS_DUMP_FULL_KEY:
 471                         /*
 472                          * Dump encryption keys (handles any key sizes)
 473                          */
 474                         if (pSMBFile == NULL)
 475                                 break;
 476                         if (!capable(CAP_SYS_ADMIN)) {
 477                                 rc = -EACCES;
 478                                 break;
 479                         }
 480                         tcon = tlink_tcon(pSMBFile->tlink);
 481                         rc = cifs_dump_full_key(tcon, (void __user *)arg);
 482                         break;
 483                 case CIFS_IOC_NOTIFY:
 484                         if (!S_ISDIR(inode->i_mode)) {
 485                                 /* Notify can only be done on directories */
 486                                 rc = -EOPNOTSUPP;
 487                                 break;
 488                         }
 489                         cifs_sb = CIFS_SB(inode->i_sb);
 490                         tlink = cifs_sb_tlink(cifs_sb);
 491                         if (IS_ERR(tlink)) {
 492                                 rc = PTR_ERR(tlink);
 493                                 break;
 494                         }
 495                         tcon = tlink_tcon(tlink);
 496                         if (tcon && tcon->ses->server->ops->notify) {
 497                                 rc = tcon->ses->server->ops->notify(xid,
 498                                                 filep, (void __user *)arg);
 499                                 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
 500                         } else
 501                                 rc = -EOPNOTSUPP;
 502                         cifs_put_tlink(tlink);
 503                         break;
 504                 case CIFS_IOC_SHUTDOWN:
 505                         rc = cifs_shutdown(inode->i_sb, arg);
 506                         break;
 507                 default:
 508                         cifs_dbg(FYI, "unsupported ioctl\n");
 509                         break;
 510         }
 511 cifs_ioc_exit:
 512         free_xid(xid);
 513         return rc;
 514 }