fs/smb/client/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_tcon_info(struct cifs_tcon *tcon, void __user *arg)
 121 {
 122         int rc = 0;
 123         struct smb_mnt_tcon_info tcon_inf;
 124
 125         tcon_inf.tid = tcon->tid;
 126         tcon_inf.session_id = tcon->ses->Suid;
 127
 128         if (copy_to_user(arg, &tcon_inf, sizeof(struct smb_mnt_tcon_info)))
 129                 rc = -EFAULT;
 130
 131         return rc;
 132 }
 133
 134 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 135                                 void __user *arg)
 136 {
 137         int rc = 0;
 138         struct smb_mnt_fs_info *fsinf;
 139
 140         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 141         if (fsinf == NULL)
 142                 return -ENOMEM;
 143
 144         fsinf->version = 1;
 145         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 146         fsinf->tcon_flags = tcon->Flags;
 147         fsinf->device_characteristics =
 148                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 149         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 150         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 151         fsinf->max_path_component =
 152                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 153         fsinf->vol_serial_number = tcon->vol_serial_number;
 154         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 155         fsinf->share_flags = tcon->share_flags;
 156         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 157         fsinf->sector_flags = tcon->ss_flags;
 158         fsinf->optimal_sector_size = tcon->perf_sector_size;
 159         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 160         fsinf->maximal_access = tcon->maximal_access;
 161         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 162
 163         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 164                 rc = -EFAULT;
 165
 166         kfree(fsinf);
 167         return rc;
 168 }
 169
 170 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
 171 {
 172         struct cifs_sb_info *sbi = CIFS_SB(sb);
 173         __u32 flags;
 174
 175         if (!capable(CAP_SYS_ADMIN))
 176                 return -EPERM;
 177
 178         if (get_user(flags, (__u32 __user *)arg))
 179                 return -EFAULT;
 180
 181         if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
 182                 return -EINVAL;
 183
 184         if (cifs_forced_shutdown(sbi))
 185                 return 0;
 186
 187         cifs_dbg(VFS, "shut down requested (%d)", flags);
 188 /*      trace_cifs_shutdown(sb, flags);*/
 189
 190         /*
 191          * see:
 192          *   https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
 193          * for more information and description of original intent of the flags
 194          */
 195         switch (flags) {
 196         /*
 197          * We could add support later for default flag which requires:
 198          *     "Flush all dirty data and metadata to disk"
 199          * would need to call syncfs or equivalent to flush page cache for
 200          * the mount and then issue fsync to server (if nostrictsync not set)
 201          */
 202         case CIFS_GOING_FLAGS_DEFAULT:
 203                 cifs_dbg(FYI, "shutdown with default flag not supported\n");
 204                 return -EINVAL;
 205         /*
 206          * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
 207          * data) but metadata writes are not cached on the client, so can treat
 208          * it similarly to NOLOGFLUSH
 209          */
 210         case CIFS_GOING_FLAGS_LOGFLUSH:
 211         case CIFS_GOING_FLAGS_NOLOGFLUSH:
 212                 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
 213                 return 0;
 214         default:
 215                 return -EINVAL;
 216         }
 217         return 0;
 218 }
 219
 220 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
 221 {
 222         struct smb3_full_key_debug_info out;
 223         struct cifs_ses *ses;
 224         int rc = 0;
 225         bool found = false;
 226         u8 __user *end;
 227
 228         if (!smb3_encryption_required(tcon)) {
 229                 rc = -EOPNOTSUPP;
 230                 goto out;
 231         }
 232
 233         /* copy user input into our output buffer */
 234         if (copy_from_user(&out, in, sizeof(out))) {
 235                 rc = -EINVAL;
 236                 goto out;
 237         }
 238
 239         if (!out.session_id) {
 240                 /* if ses id is 0, use current user session */
 241                 ses = tcon->ses;
 242         } else {
 243                 /* otherwise if a session id is given, look for it in all our sessions */
 244                 struct cifs_ses *ses_it = NULL;
 245                 struct TCP_Server_Info *server_it = NULL;
 246
 247                 spin_lock(&cifs_tcp_ses_lock);
 248                 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
 249                         list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
 250                                 spin_lock(&ses_it->ses_lock);
 251                                 if (ses_it->ses_status != SES_EXITING &&
 252                                     ses_it->Suid == out.session_id) {
 253                                         ses = ses_it;
 254                                         /*
 255                                          * since we are using the session outside the crit
 256                                          * section, we need to make sure it won't be released
 257                                          * so increment its refcount
 258                                          */
 259                                         cifs_smb_ses_inc_refcount(ses);
 260                                         spin_unlock(&ses_it->ses_lock);
 261                                         found = true;
 262                                         goto search_end;
 263                                 }
 264                                 spin_unlock(&ses_it->ses_lock);
 265                         }
 266                 }
 267 search_end:
 268                 spin_unlock(&cifs_tcp_ses_lock);
 269                 if (!found) {
 270                         rc = -ENOENT;
 271                         goto out;
 272                 }
 273         }
 274
 275         switch (ses->server->cipher_type) {
 276         case SMB2_ENCRYPTION_AES128_CCM:
 277         case SMB2_ENCRYPTION_AES128_GCM:
 278                 out.session_key_length = CIFS_SESS_KEY_SIZE;
 279                 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
 280                 break;
 281         case SMB2_ENCRYPTION_AES256_CCM:
 282         case SMB2_ENCRYPTION_AES256_GCM:
 283                 out.session_key_length = CIFS_SESS_KEY_SIZE;
 284                 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
 285                 break;
 286         default:
 287                 rc = -EOPNOTSUPP;
 288                 goto out;
 289         }
 290
 291         /* check if user buffer is big enough to store all the keys */
 292         if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
 293             + out.server_out_key_length) {
 294                 rc = -ENOBUFS;
 295                 goto out;
 296         }
 297
 298         out.session_id = ses->Suid;
 299         out.cipher_type = le16_to_cpu(ses->server->cipher_type);
 300
 301         /* overwrite user input with our output */
 302         if (copy_to_user(in, &out, sizeof(out))) {
 303                 rc = -EINVAL;
 304                 goto out;
 305         }
 306
 307         /* append all the keys at the end of the user buffer */
 308         end = in->data;
 309         if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
 310                 rc = -EINVAL;
 311                 goto out;
 312         }
 313         end += out.session_key_length;
 314
 315         if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
 316                 rc = -EINVAL;
 317                 goto out;
 318         }
 319         end += out.server_in_key_length;
 320
 321         if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
 322                 rc = -EINVAL;
 323                 goto out;
 324         }
 325
 326 out:
 327         if (found)
 328                 cifs_put_smb_ses(ses);
 329         return rc;
 330 }
 331
 332 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 333 {
 334         struct inode *inode = file_inode(filep);
 335         struct smb3_key_debug_info pkey_inf;
 336         int rc = -ENOTTY; /* strange error - but the precedent */
 337         unsigned int xid;
 338         struct cifsFileInfo *pSMBFile = filep->private_data;
 339         struct cifs_tcon *tcon;
 340         struct tcon_link *tlink;
 341         struct cifs_sb_info *cifs_sb;
 342         __u64   ExtAttrBits = 0;
 343 #ifdef CONFIG_CIFS_POSIX
 344 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 345         __u64   caps;
 346 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
 347 #endif /* CONFIG_CIFS_POSIX */
 348
 349         xid = get_xid();
 350
 351         cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
 352         if (pSMBFile == NULL)
 353                 trace_smb3_ioctl(xid, 0, command);
 354         else
 355                 trace_smb3_ioctl(xid, pSMBFile->fid.persistent_fid, command);
 356
 357         switch (command) {
 358                 case FS_IOC_GETFLAGS:
 359                         if (pSMBFile == NULL)
 360                                 break;
 361                         tcon = tlink_tcon(pSMBFile->tlink);
 362 #ifdef CONFIG_CIFS_POSIX
 363 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 364                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 365                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
 366                                 __u64   ExtAttrMask = 0;
 367                                 rc = CIFSGetExtAttr(xid, tcon,
 368                                                     pSMBFile->fid.netfid,
 369                                                     &ExtAttrBits, &ExtAttrMask);
 370                                 if (rc == 0)
 371                                         rc = put_user(ExtAttrBits &
 372                                                 FS_FL_USER_VISIBLE,
 373                                                 (int __user *)arg);
 374                                 if (rc != -EOPNOTSUPP)
 375                                         break;
 376                         }
 377 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
 378 #endif /* CONFIG_CIFS_POSIX */
 379                         rc = 0;
 380                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 381                                 /* add in the compressed bit */
 382                                 ExtAttrBits = FS_COMPR_FL;
 383                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 384                                               (int __user *)arg);
 385                         }
 386                         break;
 387                 case FS_IOC_SETFLAGS:
 388                         if (pSMBFile == NULL)
 389                                 break;
 390                         tcon = tlink_tcon(pSMBFile->tlink);
 391                         /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */
 392
 393                         if (get_user(ExtAttrBits, (int __user *)arg)) {
 394                                 rc = -EFAULT;
 395                                 break;
 396                         }
 397
 398                         /*
 399                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
 400                          *      rc = CIFSSetExtAttr(xid, tcon,
 401                          *                     pSMBFile->fid.netfid,
 402                          *                     extAttrBits,
 403                          *                     &ExtAttrMask);
 404                          * if (rc != -EOPNOTSUPP)
 405                          *      break;
 406                          */
 407
 408                         /* Currently only flag we can set is compressed flag */
 409                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
 410                                 break;
 411
 412                         /* Try to set compress flag */
 413                         if (tcon->ses->server->ops->set_compression) {
 414                                 rc = tcon->ses->server->ops->set_compression(
 415                                                         xid, tcon, pSMBFile);
 416                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 417                         }
 418                         break;
 419                 case CIFS_IOC_COPYCHUNK_FILE:
 420                         rc = cifs_ioctl_copychunk(xid, filep, arg);
 421                         break;
 422                 case CIFS_QUERY_INFO:
 423                         rc = cifs_ioctl_query_info(xid, filep, arg);
 424                         break;
 425                 case CIFS_IOC_SET_INTEGRITY:
 426                         if (pSMBFile == NULL)
 427                                 break;
 428                         tcon = tlink_tcon(pSMBFile->tlink);
 429                         if (tcon->ses->server->ops->set_integrity)
 430                                 rc = tcon->ses->server->ops->set_integrity(xid,
 431                                                 tcon, pSMBFile);
 432                         else
 433                                 rc = -EOPNOTSUPP;
 434                         break;
 435                 case CIFS_IOC_GET_MNT_INFO:
 436                         if (pSMBFile == NULL)
 437                                 break;
 438                         tcon = tlink_tcon(pSMBFile->tlink);
 439                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 440                         break;
 441                 case CIFS_IOC_GET_TCON_INFO:
 442                         cifs_sb = CIFS_SB(inode->i_sb);
 443                         tlink = cifs_sb_tlink(cifs_sb);
 444                         if (IS_ERR(tlink)) {
 445                                 rc = PTR_ERR(tlink);
 446                                 break;
 447                         }
 448                         tcon = tlink_tcon(tlink);
 449                         rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg);
 450                         cifs_put_tlink(tlink);
 451                         break;
 452                 case CIFS_ENUMERATE_SNAPSHOTS:
 453                         if (pSMBFile == NULL)
 454                                 break;
 455                         if (arg == 0) {
 456                                 rc = -EINVAL;
 457                                 goto cifs_ioc_exit;
 458                         }
 459                         tcon = tlink_tcon(pSMBFile->tlink);
 460                         if (tcon->ses->server->ops->enum_snapshots)
 461                                 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
 462                                                 pSMBFile, (void __user *)arg);
 463                         else
 464                                 rc = -EOPNOTSUPP;
 465                         break;
 466                 case CIFS_DUMP_KEY:
 467                         /*
 468                          * Dump encryption keys. This is an old ioctl that only
 469                          * handles AES-128-{CCM,GCM}.
 470                          */
 471                         if (!capable(CAP_SYS_ADMIN)) {
 472                                 rc = -EACCES;
 473                                 break;
 474                         }
 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 (!smb3_encryption_required(tcon)) {
 484                                 rc = -EOPNOTSUPP;
 485                                 cifs_put_tlink(tlink);
 486                                 break;
 487                         }
 488                         pkey_inf.cipher_type =
 489                                 le16_to_cpu(tcon->ses->server->cipher_type);
 490                         pkey_inf.Suid = tcon->ses->Suid;
 491                         memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
 492                                         16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
 493                         memcpy(pkey_inf.smb3decryptionkey,
 494                               tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
 495                         memcpy(pkey_inf.smb3encryptionkey,
 496                               tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
 497                         if (copy_to_user((void __user *)arg, &pkey_inf,
 498                                         sizeof(struct smb3_key_debug_info)))
 499                                 rc = -EFAULT;
 500                         else
 501                                 rc = 0;
 502                         cifs_put_tlink(tlink);
 503                         break;
 504                 case CIFS_DUMP_FULL_KEY:
 505                         /*
 506                          * Dump encryption keys (handles any key sizes)
 507                          */
 508                         if (pSMBFile == NULL)
 509                                 break;
 510                         if (!capable(CAP_SYS_ADMIN)) {
 511                                 rc = -EACCES;
 512                                 break;
 513                         }
 514                         cifs_sb = CIFS_SB(inode->i_sb);
 515                         tlink = cifs_sb_tlink(cifs_sb);
 516                         if (IS_ERR(tlink)) {
 517                                 rc = PTR_ERR(tlink);
 518                                 break;
 519                         }
 520
 521                         tcon = tlink_tcon(tlink);
 522                         rc = cifs_dump_full_key(tcon, (void __user *)arg);
 523                         cifs_put_tlink(tlink);
 524                         break;
 525                 case CIFS_IOC_NOTIFY:
 526                         if (!S_ISDIR(inode->i_mode)) {
 527                                 /* Notify can only be done on directories */
 528                                 rc = -EOPNOTSUPP;
 529                                 break;
 530                         }
 531                         cifs_sb = CIFS_SB(inode->i_sb);
 532                         tlink = cifs_sb_tlink(cifs_sb);
 533                         if (IS_ERR(tlink)) {
 534                                 rc = PTR_ERR(tlink);
 535                                 break;
 536                         }
 537                         tcon = tlink_tcon(tlink);
 538                         if (tcon && tcon->ses->server->ops->notify) {
 539                                 rc = tcon->ses->server->ops->notify(xid,
 540                                                 filep, (void __user *)arg,
 541                                                 false /* no ret data */);
 542                                 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
 543                         } else
 544                                 rc = -EOPNOTSUPP;
 545                         cifs_put_tlink(tlink);
 546                         break;
 547                 case CIFS_IOC_NOTIFY_INFO:
 548                         if (!S_ISDIR(inode->i_mode)) {
 549                                 /* Notify can only be done on directories */
 550                                 rc = -EOPNOTSUPP;
 551                                 break;
 552                         }
 553                         cifs_sb = CIFS_SB(inode->i_sb);
 554                         tlink = cifs_sb_tlink(cifs_sb);
 555                         if (IS_ERR(tlink)) {
 556                                 rc = PTR_ERR(tlink);
 557                                 break;
 558                         }
 559                         tcon = tlink_tcon(tlink);
 560                         if (tcon && tcon->ses->server->ops->notify) {
 561                                 rc = tcon->ses->server->ops->notify(xid,
 562                                                 filep, (void __user *)arg,
 563                                                 true /* return details */);
 564                                 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc);
 565                         } else
 566                                 rc = -EOPNOTSUPP;
 567                         cifs_put_tlink(tlink);
 568                         break;
 569                 case CIFS_IOC_SHUTDOWN:
 570                         rc = cifs_shutdown(inode->i_sb, arg);
 571                         break;
 572                 default:
 573                         cifs_dbg(FYI, "unsupported ioctl\n");
 574                         break;
 575         }
 576 cifs_ioc_exit:
 577         free_xid(xid);
 578         return rc;
 579 }