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->device_characteristics = 147 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics); 148 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType); 149 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes); 150 fsinf->max_path_component = 151 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); 152 fsinf->vol_serial_number = tcon->vol_serial_number; 153 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time); 154 fsinf->share_flags = tcon->share_flags; 155 fsinf->share_caps = le32_to_cpu(tcon->capabilities); 156 fsinf->sector_flags = tcon->ss_flags; 157 fsinf->optimal_sector_size = tcon->perf_sector_size; 158 fsinf->max_bytes_chunk = tcon->max_bytes_chunk; 159 fsinf->maximal_access = tcon->maximal_access; 160 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 161 162 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info))) 163 rc = -EFAULT; 164 165 kfree(fsinf); 166 return rc; 167 } 168 169 static int cifs_shutdown(struct super_block *sb, unsigned long arg) 170 { 171 struct cifs_sb_info *sbi = CIFS_SB(sb); 172 __u32 flags; 173 174 if (!capable(CAP_SYS_ADMIN)) 175 return -EPERM; 176 177 if (get_user(flags, (__u32 __user *)arg)) 178 return -EFAULT; 179 180 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) 181 return -EINVAL; 182 183 if (cifs_forced_shutdown(sbi)) 184 return 0; 185 186 cifs_dbg(VFS, "shut down requested (%d)", flags); 187 /* trace_cifs_shutdown(sb, flags);*/ 188 189 /* 190 * see: 191 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html 192 * for more information and description of original intent of the flags 193 */ 194 switch (flags) { 195 /* 196 * We could add support later for default flag which requires: 197 * "Flush all dirty data and metadata to disk" 198 * would need to call syncfs or equivalent to flush page cache for 199 * the mount and then issue fsync to server (if nostrictsync not set) 200 */ 201 case CIFS_GOING_FLAGS_DEFAULT: 202 cifs_dbg(FYI, "shutdown with default flag not supported\n"); 203 return -EINVAL; 204 /* 205 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not 206 * data) but metadata writes are not cached on the client, so can treat 207 * it similarly to NOLOGFLUSH 208 */ 209 case CIFS_GOING_FLAGS_LOGFLUSH: 210 case CIFS_GOING_FLAGS_NOLOGFLUSH: 211 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; 212 return 0; 213 default: 214 return -EINVAL; 215 } 216 return 0; 217 } 218 219 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) 220 { 221 struct smb3_full_key_debug_info out; 222 struct cifs_ses *ses; 223 int rc = 0; 224 bool found = false; 225 u8 __user *end; 226 227 if (!smb3_encryption_required(tcon)) { 228 rc = -EOPNOTSUPP; 229 goto out; 230 } 231 232 /* copy user input into our output buffer */ 233 if (copy_from_user(&out, in, sizeof(out))) { 234 rc = -EINVAL; 235 goto out; 236 } 237 238 if (!out.session_id) { 239 /* if ses id is 0, use current user session */ 240 ses = tcon->ses; 241 } else { 242 /* otherwise if a session id is given, look for it in all our sessions */ 243 struct cifs_ses *ses_it = NULL; 244 struct TCP_Server_Info *server_it = NULL; 245 246 spin_lock(&cifs_tcp_ses_lock); 247 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { 248 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { 249 if (ses_it->Suid == out.session_id) { 250 ses = ses_it; 251 /* 252 * since we are using the session outside the crit 253 * section, we need to make sure it won't be released 254 * so increment its refcount 255 */ 256 cifs_smb_ses_inc_refcount(ses); 257 found = true; 258 goto search_end; 259 } 260 } 261 } 262 search_end: 263 spin_unlock(&cifs_tcp_ses_lock); 264 if (!found) { 265 rc = -ENOENT; 266 goto out; 267 } 268 } 269 270 switch (ses->server->cipher_type) { 271 case SMB2_ENCRYPTION_AES128_CCM: 272 case SMB2_ENCRYPTION_AES128_GCM: 273 out.session_key_length = CIFS_SESS_KEY_SIZE; 274 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; 275 break; 276 case SMB2_ENCRYPTION_AES256_CCM: 277 case SMB2_ENCRYPTION_AES256_GCM: 278 out.session_key_length = CIFS_SESS_KEY_SIZE; 279 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; 280 break; 281 default: 282 rc = -EOPNOTSUPP; 283 goto out; 284 } 285 286 /* check if user buffer is big enough to store all the keys */ 287 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length 288 + out.server_out_key_length) { 289 rc = -ENOBUFS; 290 goto out; 291 } 292 293 out.session_id = ses->Suid; 294 out.cipher_type = le16_to_cpu(ses->server->cipher_type); 295 296 /* overwrite user input with our output */ 297 if (copy_to_user(in, &out, sizeof(out))) { 298 rc = -EINVAL; 299 goto out; 300 } 301 302 /* append all the keys at the end of the user buffer */ 303 end = in->data; 304 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { 305 rc = -EINVAL; 306 goto out; 307 } 308 end += out.session_key_length; 309 310 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { 311 rc = -EINVAL; 312 goto out; 313 } 314 end += out.server_in_key_length; 315 316 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { 317 rc = -EINVAL; 318 goto out; 319 } 320 321 out: 322 if (found) 323 cifs_put_smb_ses(ses); 324 return rc; 325 } 326 327 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) 328 { 329 struct inode *inode = file_inode(filep); 330 struct smb3_key_debug_info pkey_inf; 331 int rc = -ENOTTY; /* strange error - but the precedent */ 332 unsigned int xid; 333 struct cifsFileInfo *pSMBFile = filep->private_data; 334 struct cifs_tcon *tcon; 335 struct tcon_link *tlink; 336 struct cifs_sb_info *cifs_sb; 337 __u64 ExtAttrBits = 0; 338 #ifdef CONFIG_CIFS_POSIX 339 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 340 __u64 caps; 341 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 342 #endif /* CONFIG_CIFS_POSIX */ 343 344 xid = get_xid(); 345 346 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); 347 switch (command) { 348 case FS_IOC_GETFLAGS: 349 if (pSMBFile == NULL) 350 break; 351 tcon = tlink_tcon(pSMBFile->tlink); 352 #ifdef CONFIG_CIFS_POSIX 353 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 354 caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 355 if (CIFS_UNIX_EXTATTR_CAP & caps) { 356 __u64 ExtAttrMask = 0; 357 rc = CIFSGetExtAttr(xid, tcon, 358 pSMBFile->fid.netfid, 359 &ExtAttrBits, &ExtAttrMask); 360 if (rc == 0) 361 rc = put_user(ExtAttrBits & 362 FS_FL_USER_VISIBLE, 363 (int __user *)arg); 364 if (rc != -EOPNOTSUPP) 365 break; 366 } 367 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 368 #endif /* CONFIG_CIFS_POSIX */ 369 rc = 0; 370 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { 371 /* add in the compressed bit */ 372 ExtAttrBits = FS_COMPR_FL; 373 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, 374 (int __user *)arg); 375 } 376 break; 377 case FS_IOC_SETFLAGS: 378 if (pSMBFile == NULL) 379 break; 380 tcon = tlink_tcon(pSMBFile->tlink); 381 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ 382 383 if (get_user(ExtAttrBits, (int __user *)arg)) { 384 rc = -EFAULT; 385 break; 386 } 387 388 /* 389 * if (CIFS_UNIX_EXTATTR_CAP & caps) 390 * rc = CIFSSetExtAttr(xid, tcon, 391 * pSMBFile->fid.netfid, 392 * extAttrBits, 393 * &ExtAttrMask); 394 * if (rc != -EOPNOTSUPP) 395 * break; 396 */ 397 398 /* Currently only flag we can set is compressed flag */ 399 if ((ExtAttrBits & FS_COMPR_FL) == 0) 400 break; 401 402 /* Try to set compress flag */ 403 if (tcon->ses->server->ops->set_compression) { 404 rc = tcon->ses->server->ops->set_compression( 405 xid, tcon, pSMBFile); 406 cifs_dbg(FYI, "set compress flag rc %d\n", rc); 407 } 408 break; 409 case CIFS_IOC_COPYCHUNK_FILE: 410 rc = cifs_ioctl_copychunk(xid, filep, arg); 411 break; 412 case CIFS_QUERY_INFO: 413 rc = cifs_ioctl_query_info(xid, filep, arg); 414 break; 415 case CIFS_IOC_SET_INTEGRITY: 416 if (pSMBFile == NULL) 417 break; 418 tcon = tlink_tcon(pSMBFile->tlink); 419 if (tcon->ses->server->ops->set_integrity) 420 rc = tcon->ses->server->ops->set_integrity(xid, 421 tcon, pSMBFile); 422 else 423 rc = -EOPNOTSUPP; 424 break; 425 case CIFS_IOC_GET_MNT_INFO: 426 if (pSMBFile == NULL) 427 break; 428 tcon = tlink_tcon(pSMBFile->tlink); 429 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); 430 break; 431 case CIFS_IOC_GET_TCON_INFO: 432 cifs_sb = CIFS_SB(inode->i_sb); 433 tlink = cifs_sb_tlink(cifs_sb); 434 if (IS_ERR(tlink)) { 435 rc = PTR_ERR(tlink); 436 break; 437 } 438 tcon = tlink_tcon(tlink); 439 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg); 440 cifs_put_tlink(tlink); 441 break; 442 case CIFS_ENUMERATE_SNAPSHOTS: 443 if (pSMBFile == NULL) 444 break; 445 if (arg == 0) { 446 rc = -EINVAL; 447 goto cifs_ioc_exit; 448 } 449 tcon = tlink_tcon(pSMBFile->tlink); 450 if (tcon->ses->server->ops->enum_snapshots) 451 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, 452 pSMBFile, (void __user *)arg); 453 else 454 rc = -EOPNOTSUPP; 455 break; 456 case CIFS_DUMP_KEY: 457 /* 458 * Dump encryption keys. This is an old ioctl that only 459 * handles AES-128-{CCM,GCM}. 460 */ 461 if (!capable(CAP_SYS_ADMIN)) { 462 rc = -EACCES; 463 break; 464 } 465 466 cifs_sb = CIFS_SB(inode->i_sb); 467 tlink = cifs_sb_tlink(cifs_sb); 468 if (IS_ERR(tlink)) { 469 rc = PTR_ERR(tlink); 470 break; 471 } 472 tcon = tlink_tcon(tlink); 473 if (!smb3_encryption_required(tcon)) { 474 rc = -EOPNOTSUPP; 475 cifs_put_tlink(tlink); 476 break; 477 } 478 pkey_inf.cipher_type = 479 le16_to_cpu(tcon->ses->server->cipher_type); 480 pkey_inf.Suid = tcon->ses->Suid; 481 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 482 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); 483 memcpy(pkey_inf.smb3decryptionkey, 484 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); 485 memcpy(pkey_inf.smb3encryptionkey, 486 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); 487 if (copy_to_user((void __user *)arg, &pkey_inf, 488 sizeof(struct smb3_key_debug_info))) 489 rc = -EFAULT; 490 else 491 rc = 0; 492 cifs_put_tlink(tlink); 493 break; 494 case CIFS_DUMP_FULL_KEY: 495 /* 496 * Dump encryption keys (handles any key sizes) 497 */ 498 if (pSMBFile == NULL) 499 break; 500 if (!capable(CAP_SYS_ADMIN)) { 501 rc = -EACCES; 502 break; 503 } 504 cifs_sb = CIFS_SB(inode->i_sb); 505 tlink = cifs_sb_tlink(cifs_sb); 506 if (IS_ERR(tlink)) { 507 rc = PTR_ERR(tlink); 508 break; 509 } 510 511 tcon = tlink_tcon(tlink); 512 rc = cifs_dump_full_key(tcon, (void __user *)arg); 513 cifs_put_tlink(tlink); 514 break; 515 case CIFS_IOC_NOTIFY: 516 if (!S_ISDIR(inode->i_mode)) { 517 /* Notify can only be done on directories */ 518 rc = -EOPNOTSUPP; 519 break; 520 } 521 cifs_sb = CIFS_SB(inode->i_sb); 522 tlink = cifs_sb_tlink(cifs_sb); 523 if (IS_ERR(tlink)) { 524 rc = PTR_ERR(tlink); 525 break; 526 } 527 tcon = tlink_tcon(tlink); 528 if (tcon && tcon->ses->server->ops->notify) { 529 rc = tcon->ses->server->ops->notify(xid, 530 filep, (void __user *)arg, 531 false /* no ret data */); 532 cifs_dbg(FYI, "ioctl notify rc %d\n", rc); 533 } else 534 rc = -EOPNOTSUPP; 535 cifs_put_tlink(tlink); 536 break; 537 case CIFS_IOC_NOTIFY_INFO: 538 if (!S_ISDIR(inode->i_mode)) { 539 /* Notify can only be done on directories */ 540 rc = -EOPNOTSUPP; 541 break; 542 } 543 cifs_sb = CIFS_SB(inode->i_sb); 544 tlink = cifs_sb_tlink(cifs_sb); 545 if (IS_ERR(tlink)) { 546 rc = PTR_ERR(tlink); 547 break; 548 } 549 tcon = tlink_tcon(tlink); 550 if (tcon && tcon->ses->server->ops->notify) { 551 rc = tcon->ses->server->ops->notify(xid, 552 filep, (void __user *)arg, 553 true /* return details */); 554 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc); 555 } else 556 rc = -EOPNOTSUPP; 557 cifs_put_tlink(tlink); 558 break; 559 case CIFS_IOC_SHUTDOWN: 560 rc = cifs_shutdown(inode->i_sb, arg); 561 break; 562 default: 563 cifs_dbg(FYI, "unsupported ioctl\n"); 564 break; 565 } 566 cifs_ioc_exit: 567 free_xid(xid); 568 return rc; 569 } 570