fs/cifs/ioctl.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   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  */
  10
  11 #include <linux/fs.h>
  12 #include <linux/file.h>
  13 #include <linux/mount.h>
  14 #include <linux/mm.h>
  15 #include <linux/pagemap.h>
  16 #include "cifspdu.h"
  17 #include "cifsglob.h"
  18 #include "cifsproto.h"
  19 #include "cifs_debug.h"
  20 #include "cifsfs.h"
  21 #include "cifs_ioctl.h"
  22 #include "smb2proto.h"
  23 #include "smb2glob.h"
  24 #include <linux/btrfs.h>
  25
  26 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
  27                                   unsigned long p)
  28 {
  29         struct inode *inode = file_inode(filep);
  30         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  31         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
  32         struct dentry *dentry = filep->f_path.dentry;
  33         const unsigned char *path;
  34         void *page = alloc_dentry_path();
  35         __le16 *utf16_path = NULL, root_path;
  36         int rc = 0;
  37
  38         path = build_path_from_dentry(dentry, page);
  39         if (IS_ERR(path)) {
  40                 free_dentry_path(page);
  41                 return PTR_ERR(path);
  42         }
  43
  44         cifs_dbg(FYI, "%s %s\n", __func__, path);
  45
  46         if (!path[0]) {
  47                 root_path = 0;
  48                 utf16_path = &root_path;
  49         } else {
  50                 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
  51                 if (!utf16_path) {
  52                         rc = -ENOMEM;
  53                         goto ici_exit;
  54                 }
  55         }
  56
  57         if (tcon->ses->server->ops->ioctl_query_info)
  58                 rc = tcon->ses->server->ops->ioctl_query_info(
  59                                 xid, tcon, cifs_sb, utf16_path,
  60                                 filep->private_data ? 0 : 1, p);
  61         else
  62                 rc = -EOPNOTSUPP;
  63
  64  ici_exit:
  65         if (utf16_path != &root_path)
  66                 kfree(utf16_path);
  67         free_dentry_path(page);
  68         return rc;
  69 }
  70
  71 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
  72                         unsigned long srcfd)
  73 {
  74         int rc;
  75         struct fd src_file;
  76         struct inode *src_inode;
  77
  78         cifs_dbg(FYI, "ioctl copychunk range\n");
  79         /* the destination must be opened for writing */
  80         if (!(dst_file->f_mode & FMODE_WRITE)) {
  81                 cifs_dbg(FYI, "file target not open for write\n");
  82                 return -EINVAL;
  83         }
  84
  85         /* check if target volume is readonly and take reference */
  86         rc = mnt_want_write_file(dst_file);
  87         if (rc) {
  88                 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
  89                 return rc;
  90         }
  91
  92         src_file = fdget(srcfd);
  93         if (!src_file.file) {
  94                 rc = -EBADF;
  95                 goto out_drop_write;
  96         }
  97
  98         if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
  99                 rc = -EBADF;
 100                 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
 101                 goto out_fput;
 102         }
 103
 104         src_inode = file_inode(src_file.file);
 105         rc = -EINVAL;
 106         if (S_ISDIR(src_inode->i_mode))
 107                 goto out_fput;
 108
 109         rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
 110                                         src_inode->i_size, 0);
 111         if (rc > 0)
 112                 rc = 0;
 113 out_fput:
 114         fdput(src_file);
 115 out_drop_write:
 116         mnt_drop_write_file(dst_file);
 117         return rc;
 118 }
 119
 120 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 121                                 void __user *arg)
 122 {
 123         int rc = 0;
 124         struct smb_mnt_fs_info *fsinf;
 125
 126         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 127         if (fsinf == NULL)
 128                 return -ENOMEM;
 129
 130         fsinf->version = 1;
 131         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 132         fsinf->device_characteristics =
 133                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 134         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 135         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 136         fsinf->max_path_component =
 137                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 138         fsinf->vol_serial_number = tcon->vol_serial_number;
 139         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 140         fsinf->share_flags = tcon->share_flags;
 141         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 142         fsinf->sector_flags = tcon->ss_flags;
 143         fsinf->optimal_sector_size = tcon->perf_sector_size;
 144         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 145         fsinf->maximal_access = tcon->maximal_access;
 146         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 147
 148         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 149                 rc = -EFAULT;
 150
 151         kfree(fsinf);
 152         return rc;
 153 }
 154
 155 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
 156 {
 157         struct cifs_sb_info *sbi = CIFS_SB(sb);
 158         __u32 flags;
 159
 160         if (!capable(CAP_SYS_ADMIN))
 161                 return -EPERM;
 162
 163         if (get_user(flags, (__u32 __user *)arg))
 164                 return -EFAULT;
 165
 166         if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
 167                 return -EINVAL;
 168
 169         if (cifs_forced_shutdown(sbi))
 170                 return 0;
 171
 172         cifs_dbg(VFS, "shut down requested (%d)", flags);
 173 /*      trace_cifs_shutdown(sb, flags);*/
 174
 175         /*
 176          * see:
 177          *   https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
 178          * for more information and description of original intent of the flags
 179          */
 180         switch (flags) {
 181         /*
 182          * We could add support later for default flag which requires:
 183          *     "Flush all dirty data and metadata to disk"
 184          * would need to call syncfs or equivalent to flush page cache for
 185          * the mount and then issue fsync to server (if nostrictsync not set)
 186          */
 187         case CIFS_GOING_FLAGS_DEFAULT:
 188                 cifs_dbg(FYI, "shutdown with default flag not supported\n");
 189                 return -EINVAL;
 190         /*
 191          * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
 192          * data) but metadata writes are not cached on the client, so can treat
 193          * it similarly to NOLOGFLUSH
 194          */
 195         case CIFS_GOING_FLAGS_LOGFLUSH:
 196         case CIFS_GOING_FLAGS_NOLOGFLUSH:
 197                 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
 198                 return 0;
 199         default:
 200                 return -EINVAL;
 201         }
 202         return 0;
 203 }
 204
 205 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
 206 {
 207         struct smb3_full_key_debug_info out;
 208         struct cifs_ses *ses;
 209         int rc = 0;
 210         bool found = false;
 211         u8 __user *end;
 212
 213         if (!smb3_encryption_required(tcon)) {
 214                 rc = -EOPNOTSUPP;
 215                 goto out;
 216         }
 217
 218         /* copy user input into our output buffer */
 219         if (copy_from_user(&out, in, sizeof(out))) {
 220                 rc = -EINVAL;
 221                 goto out;
 222         }
 223
 224         if (!out.session_id) {
 225                 /* if ses id is 0, use current user session */
 226                 ses = tcon->ses;
 227         } else {
 228                 /* otherwise if a session id is given, look for it in all our sessions */
 229                 struct cifs_ses *ses_it = NULL;
 230                 struct TCP_Server_Info *server_it = NULL;
 231
 232                 spin_lock(&cifs_tcp_ses_lock);
 233                 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
 234                         list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
 235                                 if (ses_it->Suid == out.session_id) {
 236                                         ses = ses_it;
 237                                         /*
 238                                          * since we are using the session outside the crit
 239                                          * section, we need to make sure it won't be released
 240                                          * so increment its refcount
 241                                          */
 242                                         ses->ses_count++;
 243                                         found = true;
 244                                         goto search_end;
 245                                 }
 246                         }
 247                 }
 248 search_end:
 249                 spin_unlock(&cifs_tcp_ses_lock);
 250                 if (!found) {
 251                         rc = -ENOENT;
 252                         goto out;
 253                 }
 254         }
 255
 256         switch (ses->server->cipher_type) {
 257         case SMB2_ENCRYPTION_AES128_CCM:
 258         case SMB2_ENCRYPTION_AES128_GCM:
 259                 out.session_key_length = CIFS_SESS_KEY_SIZE;
 260                 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
 261                 break;
 262         case SMB2_ENCRYPTION_AES256_CCM:
 263         case SMB2_ENCRYPTION_AES256_GCM:
 264                 out.session_key_length = CIFS_SESS_KEY_SIZE;
 265                 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
 266                 break;
 267         default:
 268                 rc = -EOPNOTSUPP;
 269                 goto out;
 270         }
 271
 272         /* check if user buffer is big enough to store all the keys */
 273         if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
 274             + out.server_out_key_length) {
 275                 rc = -ENOBUFS;
 276                 goto out;
 277         }
 278
 279         out.session_id = ses->Suid;
 280         out.cipher_type = le16_to_cpu(ses->server->cipher_type);
 281
 282         /* overwrite user input with our output */
 283         if (copy_to_user(in, &out, sizeof(out))) {
 284                 rc = -EINVAL;
 285                 goto out;
 286         }
 287
 288         /* append all the keys at the end of the user buffer */
 289         end = in->data;
 290         if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
 291                 rc = -EINVAL;
 292                 goto out;
 293         }
 294         end += out.session_key_length;
 295
 296         if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
 297                 rc = -EINVAL;
 298                 goto out;
 299         }
 300         end += out.server_in_key_length;
 301
 302         if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
 303                 rc = -EINVAL;
 304                 goto out;
 305         }
 306
 307 out:
 308         if (found)
 309                 cifs_put_smb_ses(ses);
 310         return rc;
 311 }
 312
 313 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 314 {
 315         struct inode *inode = file_inode(filep);
 316         struct smb3_key_debug_info pkey_inf;
 317         int rc = -ENOTTY; /* strange error - but the precedent */
 318         unsigned int xid;
 319         struct cifsFileInfo *pSMBFile = filep->private_data;
 320         struct cifs_tcon *tcon;
 321         struct tcon_link *tlink;
 322         struct cifs_sb_info *cifs_sb;
 323         __u64   ExtAttrBits = 0;
 324         __u64   caps;
 325
 326         xid = get_xid();
 327
 328         cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
 329         switch (command) {
 330                 case FS_IOC_GETFLAGS:
 331                         if (pSMBFile == NULL)
 332                                 break;
 333                         tcon = tlink_tcon(pSMBFile->tlink);
 334                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 335 #ifdef CONFIG_CIFS_POSIX
 336                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
 337                                 __u64   ExtAttrMask = 0;
 338                                 rc = CIFSGetExtAttr(xid, tcon,
 339                                                     pSMBFile->fid.netfid,
 340                                                     &ExtAttrBits, &ExtAttrMask);
 341                                 if (rc == 0)
 342                                         rc = put_user(ExtAttrBits &
 343                                                 FS_FL_USER_VISIBLE,
 344                                                 (int __user *)arg);
 345                                 if (rc != EOPNOTSUPP)
 346                                         break;
 347                         }
 348 #endif /* CONFIG_CIFS_POSIX */
 349                         rc = 0;
 350                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 351                                 /* add in the compressed bit */
 352                                 ExtAttrBits = FS_COMPR_FL;
 353                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 354                                               (int __user *)arg);
 355                         }
 356                         break;
 357                 case FS_IOC_SETFLAGS:
 358                         if (pSMBFile == NULL)
 359                                 break;
 360                         tcon = tlink_tcon(pSMBFile->tlink);
 361                         /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */
 362
 363                         if (get_user(ExtAttrBits, (int __user *)arg)) {
 364                                 rc = -EFAULT;
 365                                 break;
 366                         }
 367
 368                         /*
 369                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
 370                          *      rc = CIFSSetExtAttr(xid, tcon,
 371                          *                     pSMBFile->fid.netfid,
 372                          *                     extAttrBits,
 373                          *                     &ExtAttrMask);
 374                          * if (rc != EOPNOTSUPP)
 375                          *      break;
 376                          */
 377
 378                         /* Currently only flag we can set is compressed flag */
 379                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
 380                                 break;
 381
 382                         /* Try to set compress flag */
 383                         if (tcon->ses->server->ops->set_compression) {
 384                                 rc = tcon->ses->server->ops->set_compression(
 385                                                         xid, tcon, pSMBFile);
 386                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 387                         }
 388                         break;
 389                 case CIFS_IOC_COPYCHUNK_FILE:
 390                         rc = cifs_ioctl_copychunk(xid, filep, arg);
 391                         break;
 392                 case CIFS_QUERY_INFO:
 393                         rc = cifs_ioctl_query_info(xid, filep, arg);
 394                         break;
 395                 case CIFS_IOC_SET_INTEGRITY:
 396                         if (pSMBFile == NULL)
 397                                 break;
 398                         tcon = tlink_tcon(pSMBFile->tlink);
 399                         if (tcon->ses->server->ops->set_integrity)
 400                                 rc = tcon->ses->server->ops->set_integrity(xid,
 401                                                 tcon, pSMBFile);
 402                         else
 403                                 rc = -EOPNOTSUPP;
 404                         break;
 405                 case CIFS_IOC_GET_MNT_INFO:
 406                         if (pSMBFile == NULL)
 407                                 break;
 408                         tcon = tlink_tcon(pSMBFile->tlink);
 409                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 410                         break;
 411                 case CIFS_ENUMERATE_SNAPSHOTS:
 412                         if (pSMBFile == NULL)
 413                                 break;
 414                         if (arg == 0) {
 415                                 rc = -EINVAL;
 416                                 goto cifs_ioc_exit;
 417                         }
 418                         tcon = tlink_tcon(pSMBFile->tlink);
 419                         if (tcon->ses->server->ops->enum_snapshots)
 420                                 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
 421                                                 pSMBFile, (void __user *)arg);
 422                         else
 423                                 rc = -EOPNOTSUPP;
 424                         break;
 425                 case CIFS_DUMP_KEY:
 426                         /*
 427                          * Dump encryption keys. This is an old ioctl that only
 428                          * handles AES-128-{CCM,GCM}.
 429                          */
 430                         if (pSMBFile == NULL)
 431                                 break;
 432                         if (!capable(CAP_SYS_ADMIN)) {
 433                                 rc = -EACCES;
 434                                 break;
 435                         }
 436
 437                         tcon = tlink_tcon(pSMBFile->tlink);
 438                         if (!smb3_encryption_required(tcon)) {
 439                                 rc = -EOPNOTSUPP;
 440                                 break;
 441                         }
 442                         pkey_inf.cipher_type =
 443                                 le16_to_cpu(tcon->ses->server->cipher_type);
 444                         pkey_inf.Suid = tcon->ses->Suid;
 445                         memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
 446                                         16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
 447                         memcpy(pkey_inf.smb3decryptionkey,
 448                               tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
 449                         memcpy(pkey_inf.smb3encryptionkey,
 450                               tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
 451                         if (copy_to_user((void __user *)arg, &pkey_inf,
 452                                         sizeof(struct smb3_key_debug_info)))
 453                                 rc = -EFAULT;
 454                         else
 455                                 rc = 0;
 456                         break;
 457                 case CIFS_DUMP_FULL_KEY:
 458                         /*
 459                          * Dump encryption keys (handles any key sizes)
 460                          */
 461                         if (pSMBFile == NULL)
 462                                 break;
 463                         if (!capable(CAP_SYS_ADMIN)) {
 464                                 rc = -EACCES;
 465                                 break;
 466                         }
 467                         tcon = tlink_tcon(pSMBFile->tlink);
 468                         rc = cifs_dump_full_key(tcon, (void __user *)arg);
 469                         break;
 470                 case CIFS_IOC_NOTIFY:
 471                         if (!S_ISDIR(inode->i_mode)) {
 472                                 /* Notify can only be done on directories */
 473                                 rc = -EOPNOTSUPP;
 474                                 break;
 475                         }
 476                         cifs_sb = CIFS_SB(inode->i_sb);
 477                         tlink = cifs_sb_tlink(cifs_sb);
 478                         if (IS_ERR(tlink)) {
 479                                 rc = PTR_ERR(tlink);
 480                                 break;
 481                         }
 482                         tcon = tlink_tcon(tlink);
 483                         if (tcon && tcon->ses->server->ops->notify) {
 484                                 rc = tcon->ses->server->ops->notify(xid,
 485                                                 filep, (void __user *)arg);
 486                                 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
 487                         } else
 488                                 rc = -EOPNOTSUPP;
 489                         cifs_put_tlink(tlink);
 490                         break;
 491                 case CIFS_IOC_SHUTDOWN:
 492                         rc = cifs_shutdown(inode->i_sb, arg);
 493                         break;
 494                 default:
 495                         cifs_dbg(FYI, "unsupported ioctl\n");
 496                         break;
 497         }
 498 cifs_ioc_exit:
 499         free_xid(xid);
 500         return rc;
 501 }