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 "cifsglob.h" 17 #include "cifsproto.h" 18 #include "cifs_debug.h" 19 #include "cifsfs.h" 20 #include "cifs_ioctl.h" 21 #include "smb2proto.h" 22 #include "smb2glob.h" 23 #include <linux/btrfs.h> 24 25 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep, 26 unsigned long p) 27 { 28 struct inode *inode = file_inode(filep); 29 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 30 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 31 struct dentry *dentry = filep->f_path.dentry; 32 const unsigned char *path; 33 void *page = alloc_dentry_path(); 34 __le16 *utf16_path = NULL, root_path; 35 int rc = 0; 36 37 path = build_path_from_dentry(dentry, page); 38 if (IS_ERR(path)) { 39 free_dentry_path(page); 40 return PTR_ERR(path); 41 } 42 43 cifs_dbg(FYI, "%s %s\n", __func__, path); 44 45 if (!path[0]) { 46 root_path = 0; 47 utf16_path = &root_path; 48 } else { 49 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb); 50 if (!utf16_path) { 51 rc = -ENOMEM; 52 goto ici_exit; 53 } 54 } 55 56 if (tcon->ses->server->ops->ioctl_query_info) 57 rc = tcon->ses->server->ops->ioctl_query_info( 58 xid, tcon, cifs_sb, utf16_path, 59 filep->private_data ? 0 : 1, p); 60 else 61 rc = -EOPNOTSUPP; 62 63 ici_exit: 64 if (utf16_path != &root_path) 65 kfree(utf16_path); 66 free_dentry_path(page); 67 return rc; 68 } 69 70 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file, 71 unsigned long srcfd) 72 { 73 int rc; 74 struct inode *src_inode; 75 76 cifs_dbg(FYI, "ioctl copychunk range\n"); 77 /* the destination must be opened for writing */ 78 if (!(dst_file->f_mode & FMODE_WRITE)) { 79 cifs_dbg(FYI, "file target not open for write\n"); 80 return -EINVAL; 81 } 82 83 /* check if target volume is readonly and take reference */ 84 rc = mnt_want_write_file(dst_file); 85 if (rc) { 86 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc); 87 return rc; 88 } 89 90 CLASS(fd, src_file)(srcfd); 91 if (fd_empty(src_file)) { 92 rc = -EBADF; 93 goto out_drop_write; 94 } 95 96 if (fd_file(src_file)->f_op->unlocked_ioctl != cifs_ioctl) { 97 rc = -EBADF; 98 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n"); 99 goto out_drop_write; 100 } 101 102 src_inode = file_inode(fd_file(src_file)); 103 rc = -EINVAL; 104 if (S_ISDIR(src_inode->i_mode)) 105 goto out_drop_write; 106 107 rc = cifs_file_copychunk_range(xid, fd_file(src_file), 0, dst_file, 0, 108 src_inode->i_size, 0); 109 if (rc > 0) 110 rc = 0; 111 out_drop_write: 112 mnt_drop_write_file(dst_file); 113 return rc; 114 } 115 116 static long smb_mnt_get_tcon_info(struct cifs_tcon *tcon, void __user *arg) 117 { 118 int rc = 0; 119 struct smb_mnt_tcon_info tcon_inf; 120 121 tcon_inf.tid = tcon->tid; 122 tcon_inf.session_id = tcon->ses->Suid; 123 124 if (copy_to_user(arg, &tcon_inf, sizeof(struct smb_mnt_tcon_info))) 125 rc = -EFAULT; 126 127 return rc; 128 } 129 130 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon, 131 void __user *arg) 132 { 133 int rc = 0; 134 struct smb_mnt_fs_info *fsinf; 135 136 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL); 137 if (fsinf == NULL) 138 return -ENOMEM; 139 140 fsinf->version = 1; 141 fsinf->protocol_id = tcon->ses->server->vals->protocol_id; 142 fsinf->tcon_flags = tcon->Flags; 143 fsinf->device_characteristics = 144 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics); 145 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType); 146 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes); 147 fsinf->max_path_component = 148 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); 149 fsinf->vol_serial_number = tcon->vol_serial_number; 150 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time); 151 fsinf->share_flags = tcon->share_flags; 152 fsinf->share_caps = le32_to_cpu(tcon->capabilities); 153 fsinf->sector_flags = tcon->ss_flags; 154 fsinf->optimal_sector_size = tcon->perf_sector_size; 155 fsinf->max_bytes_chunk = tcon->max_bytes_chunk; 156 fsinf->maximal_access = tcon->maximal_access; 157 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 158 159 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info))) 160 rc = -EFAULT; 161 162 kfree(fsinf); 163 return rc; 164 } 165 166 static int cifs_shutdown(struct super_block *sb, unsigned long arg) 167 { 168 struct cifs_sb_info *sbi = CIFS_SB(sb); 169 struct tcon_link *tlink; 170 struct cifs_tcon *tcon; 171 __u32 flags; 172 int rc; 173 174 if (!capable(CAP_SYS_ADMIN)) 175 return -EPERM; 176 177 if (get_user(flags, (__u32 __user *)arg)) 178 return -EFAULT; 179 180 tlink = cifs_sb_tlink(sbi); 181 if (IS_ERR(tlink)) 182 return PTR_ERR(tlink); 183 tcon = tlink_tcon(tlink); 184 185 trace_smb3_shutdown_enter(flags, tcon->tid); 186 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) { 187 rc = -EINVAL; 188 goto shutdown_out_err; 189 } 190 191 if (cifs_forced_shutdown(sbi)) 192 goto shutdown_good; 193 194 cifs_dbg(VFS, "shut down requested (%d)", flags); 195 196 /* 197 * see: 198 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html 199 * for more information and description of original intent of the flags 200 */ 201 switch (flags) { 202 /* 203 * We could add support later for default flag which requires: 204 * "Flush all dirty data and metadata to disk" 205 * would need to call syncfs or equivalent to flush page cache for 206 * the mount and then issue fsync to server (if nostrictsync not set) 207 */ 208 case CIFS_GOING_FLAGS_DEFAULT: 209 cifs_dbg(FYI, "shutdown with default flag not supported\n"); 210 rc = -EINVAL; 211 goto shutdown_out_err; 212 /* 213 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not 214 * data) but metadata writes are not cached on the client, so can treat 215 * it similarly to NOLOGFLUSH 216 */ 217 case CIFS_GOING_FLAGS_LOGFLUSH: 218 case CIFS_GOING_FLAGS_NOLOGFLUSH: 219 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; 220 goto shutdown_good; 221 default: 222 rc = -EINVAL; 223 goto shutdown_out_err; 224 } 225 226 shutdown_good: 227 trace_smb3_shutdown_done(flags, tcon->tid); 228 cifs_put_tlink(tlink); 229 return 0; 230 shutdown_out_err: 231 trace_smb3_shutdown_err(rc, flags, tcon->tid); 232 cifs_put_tlink(tlink); 233 return rc; 234 } 235 236 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) 237 { 238 struct smb3_full_key_debug_info out; 239 struct cifs_ses *ses; 240 int rc = 0; 241 bool found = false; 242 u8 __user *end; 243 244 if (!smb3_encryption_required(tcon)) { 245 rc = -EOPNOTSUPP; 246 goto out; 247 } 248 249 /* copy user input into our output buffer */ 250 if (copy_from_user(&out, in, sizeof(out))) { 251 rc = -EINVAL; 252 goto out; 253 } 254 255 if (!out.session_id) { 256 /* if ses id is 0, use current user session */ 257 ses = tcon->ses; 258 } else { 259 /* otherwise if a session id is given, look for it in all our sessions */ 260 struct cifs_ses *ses_it = NULL; 261 struct TCP_Server_Info *server_it = NULL; 262 263 spin_lock(&cifs_tcp_ses_lock); 264 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { 265 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { 266 spin_lock(&ses_it->ses_lock); 267 if (ses_it->ses_status != SES_EXITING && 268 ses_it->Suid == out.session_id) { 269 ses = ses_it; 270 /* 271 * since we are using the session outside the crit 272 * section, we need to make sure it won't be released 273 * so increment its refcount 274 */ 275 cifs_smb_ses_inc_refcount(ses); 276 spin_unlock(&ses_it->ses_lock); 277 found = true; 278 goto search_end; 279 } 280 spin_unlock(&ses_it->ses_lock); 281 } 282 } 283 search_end: 284 spin_unlock(&cifs_tcp_ses_lock); 285 if (!found) { 286 rc = -ENOENT; 287 goto out; 288 } 289 } 290 291 switch (ses->server->cipher_type) { 292 case SMB2_ENCRYPTION_AES128_CCM: 293 case SMB2_ENCRYPTION_AES128_GCM: 294 out.session_key_length = CIFS_SESS_KEY_SIZE; 295 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; 296 break; 297 case SMB2_ENCRYPTION_AES256_CCM: 298 case SMB2_ENCRYPTION_AES256_GCM: 299 out.session_key_length = CIFS_SESS_KEY_SIZE; 300 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; 301 break; 302 default: 303 rc = -EOPNOTSUPP; 304 goto out; 305 } 306 307 /* check if user buffer is big enough to store all the keys */ 308 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length 309 + out.server_out_key_length) { 310 rc = -ENOBUFS; 311 goto out; 312 } 313 314 out.session_id = ses->Suid; 315 out.cipher_type = le16_to_cpu(ses->server->cipher_type); 316 317 /* overwrite user input with our output */ 318 if (copy_to_user(in, &out, sizeof(out))) { 319 rc = -EINVAL; 320 goto out; 321 } 322 323 /* append all the keys at the end of the user buffer */ 324 end = in->data; 325 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { 326 rc = -EINVAL; 327 goto out; 328 } 329 end += out.session_key_length; 330 331 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { 332 rc = -EINVAL; 333 goto out; 334 } 335 end += out.server_in_key_length; 336 337 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { 338 rc = -EINVAL; 339 goto out; 340 } 341 342 out: 343 if (found) 344 cifs_put_smb_ses(ses); 345 return rc; 346 } 347 348 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) 349 { 350 struct inode *inode = file_inode(filep); 351 struct smb3_key_debug_info pkey_inf; 352 int rc = -ENOTTY; /* strange error - but the precedent */ 353 unsigned int xid; 354 struct cifsFileInfo *pSMBFile = filep->private_data; 355 struct cifs_tcon *tcon; 356 struct tcon_link *tlink; 357 struct cifs_sb_info *cifs_sb; 358 __u64 ExtAttrBits = 0; 359 #ifdef CONFIG_CIFS_POSIX 360 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 361 __u64 caps; 362 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 363 #endif /* CONFIG_CIFS_POSIX */ 364 365 xid = get_xid(); 366 367 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); 368 if (pSMBFile == NULL) 369 trace_smb3_ioctl(xid, 0, command); 370 else 371 trace_smb3_ioctl(xid, pSMBFile->fid.persistent_fid, command); 372 373 switch (command) { 374 case FS_IOC_GETFLAGS: 375 if (pSMBFile == NULL) 376 break; 377 tcon = tlink_tcon(pSMBFile->tlink); 378 #ifdef CONFIG_CIFS_POSIX 379 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 380 caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 381 if (CIFS_UNIX_EXTATTR_CAP & caps) { 382 __u64 ExtAttrMask = 0; 383 rc = CIFSGetExtAttr(xid, tcon, 384 pSMBFile->fid.netfid, 385 &ExtAttrBits, &ExtAttrMask); 386 if (rc == 0) 387 rc = put_user(ExtAttrBits & 388 FS_FL_USER_VISIBLE, 389 (int __user *)arg); 390 if (rc != -EOPNOTSUPP) 391 break; 392 } 393 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 394 #endif /* CONFIG_CIFS_POSIX */ 395 rc = 0; 396 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { 397 /* add in the compressed bit */ 398 ExtAttrBits = FS_COMPR_FL; 399 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, 400 (int __user *)arg); 401 } 402 break; 403 case FS_IOC_SETFLAGS: 404 if (pSMBFile == NULL) 405 break; 406 tcon = tlink_tcon(pSMBFile->tlink); 407 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ 408 409 if (get_user(ExtAttrBits, (int __user *)arg)) { 410 rc = -EFAULT; 411 break; 412 } 413 414 /* 415 * if (CIFS_UNIX_EXTATTR_CAP & caps) 416 * rc = CIFSSetExtAttr(xid, tcon, 417 * pSMBFile->fid.netfid, 418 * extAttrBits, 419 * &ExtAttrMask); 420 * if (rc != -EOPNOTSUPP) 421 * break; 422 */ 423 424 /* Currently only flag we can set is compressed flag */ 425 if ((ExtAttrBits & FS_COMPR_FL) == 0) 426 break; 427 428 /* Try to set compress flag */ 429 if (tcon->ses->server->ops->set_compression) { 430 rc = tcon->ses->server->ops->set_compression( 431 xid, tcon, pSMBFile); 432 cifs_dbg(FYI, "set compress flag rc %d\n", rc); 433 } 434 break; 435 case CIFS_IOC_COPYCHUNK_FILE: 436 rc = cifs_ioctl_copychunk(xid, filep, arg); 437 break; 438 case CIFS_QUERY_INFO: 439 rc = cifs_ioctl_query_info(xid, filep, arg); 440 break; 441 case CIFS_IOC_SET_INTEGRITY: 442 if (pSMBFile == NULL) 443 break; 444 tcon = tlink_tcon(pSMBFile->tlink); 445 if (tcon->ses->server->ops->set_integrity) 446 rc = tcon->ses->server->ops->set_integrity(xid, 447 tcon, pSMBFile); 448 else 449 rc = -EOPNOTSUPP; 450 break; 451 case CIFS_IOC_GET_MNT_INFO: 452 if (pSMBFile == NULL) 453 break; 454 tcon = tlink_tcon(pSMBFile->tlink); 455 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); 456 break; 457 case CIFS_IOC_GET_TCON_INFO: 458 cifs_sb = CIFS_SB(inode->i_sb); 459 tlink = cifs_sb_tlink(cifs_sb); 460 if (IS_ERR(tlink)) { 461 rc = PTR_ERR(tlink); 462 break; 463 } 464 tcon = tlink_tcon(tlink); 465 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg); 466 cifs_put_tlink(tlink); 467 break; 468 case CIFS_ENUMERATE_SNAPSHOTS: 469 if (pSMBFile == NULL) 470 break; 471 if (arg == 0) { 472 rc = -EINVAL; 473 goto cifs_ioc_exit; 474 } 475 tcon = tlink_tcon(pSMBFile->tlink); 476 if (tcon->ses->server->ops->enum_snapshots) 477 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, 478 pSMBFile, (void __user *)arg); 479 else 480 rc = -EOPNOTSUPP; 481 break; 482 case CIFS_DUMP_KEY: 483 /* 484 * Dump encryption keys. This is an old ioctl that only 485 * handles AES-128-{CCM,GCM}. 486 */ 487 if (!capable(CAP_SYS_ADMIN)) { 488 rc = -EACCES; 489 break; 490 } 491 492 cifs_sb = CIFS_SB(inode->i_sb); 493 tlink = cifs_sb_tlink(cifs_sb); 494 if (IS_ERR(tlink)) { 495 rc = PTR_ERR(tlink); 496 break; 497 } 498 tcon = tlink_tcon(tlink); 499 if (!smb3_encryption_required(tcon)) { 500 rc = -EOPNOTSUPP; 501 cifs_put_tlink(tlink); 502 break; 503 } 504 pkey_inf.cipher_type = 505 le16_to_cpu(tcon->ses->server->cipher_type); 506 pkey_inf.Suid = tcon->ses->Suid; 507 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 508 SMB2_NTLMV2_SESSKEY_SIZE); 509 memcpy(pkey_inf.smb3decryptionkey, 510 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); 511 memcpy(pkey_inf.smb3encryptionkey, 512 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); 513 if (copy_to_user((void __user *)arg, &pkey_inf, 514 sizeof(struct smb3_key_debug_info))) 515 rc = -EFAULT; 516 else 517 rc = 0; 518 cifs_put_tlink(tlink); 519 break; 520 case CIFS_DUMP_FULL_KEY: 521 /* 522 * Dump encryption keys (handles any key sizes) 523 */ 524 if (pSMBFile == NULL) 525 break; 526 if (!capable(CAP_SYS_ADMIN)) { 527 rc = -EACCES; 528 break; 529 } 530 cifs_sb = CIFS_SB(inode->i_sb); 531 tlink = cifs_sb_tlink(cifs_sb); 532 if (IS_ERR(tlink)) { 533 rc = PTR_ERR(tlink); 534 break; 535 } 536 537 tcon = tlink_tcon(tlink); 538 rc = cifs_dump_full_key(tcon, (void __user *)arg); 539 cifs_put_tlink(tlink); 540 break; 541 case CIFS_IOC_NOTIFY: 542 if (!S_ISDIR(inode->i_mode)) { 543 /* Notify can only be done on directories */ 544 rc = -EOPNOTSUPP; 545 break; 546 } 547 cifs_sb = CIFS_SB(inode->i_sb); 548 tlink = cifs_sb_tlink(cifs_sb); 549 if (IS_ERR(tlink)) { 550 rc = PTR_ERR(tlink); 551 break; 552 } 553 tcon = tlink_tcon(tlink); 554 if (tcon && tcon->ses->server->ops->notify) { 555 rc = tcon->ses->server->ops->notify(xid, 556 filep, (void __user *)arg, 557 false /* no ret data */); 558 cifs_dbg(FYI, "ioctl notify rc %d\n", rc); 559 } else 560 rc = -EOPNOTSUPP; 561 cifs_put_tlink(tlink); 562 break; 563 case CIFS_IOC_NOTIFY_INFO: 564 if (!S_ISDIR(inode->i_mode)) { 565 /* Notify can only be done on directories */ 566 rc = -EOPNOTSUPP; 567 break; 568 } 569 cifs_sb = CIFS_SB(inode->i_sb); 570 tlink = cifs_sb_tlink(cifs_sb); 571 if (IS_ERR(tlink)) { 572 rc = PTR_ERR(tlink); 573 break; 574 } 575 tcon = tlink_tcon(tlink); 576 if (tcon && tcon->ses->server->ops->notify) { 577 rc = tcon->ses->server->ops->notify(xid, 578 filep, (void __user *)arg, 579 true /* return details */); 580 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc); 581 } else 582 rc = -EOPNOTSUPP; 583 cifs_put_tlink(tlink); 584 break; 585 case CIFS_IOC_SHUTDOWN: 586 rc = cifs_shutdown(inode->i_sb, arg); 587 break; 588 default: 589 cifs_dbg(FYI, "unsupported ioctl\n"); 590 trace_smb3_unsupported_ioctl(xid, 591 pSMBFile ? pSMBFile->fid.persistent_fid : 0, 592 command); 593 break; 594 } 595 cifs_ioc_exit: 596 free_xid(xid); 597 return rc; 598 } 599