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 inode *src_inode; 76 77 cifs_dbg(FYI, "ioctl copychunk range\n"); 78 /* the destination must be opened for writing */ 79 if (!(dst_file->f_mode & FMODE_WRITE)) { 80 cifs_dbg(FYI, "file target not open for write\n"); 81 return -EINVAL; 82 } 83 84 /* check if target volume is readonly and take reference */ 85 rc = mnt_want_write_file(dst_file); 86 if (rc) { 87 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc); 88 return rc; 89 } 90 91 CLASS(fd, src_file)(srcfd); 92 if (fd_empty(src_file)) { 93 rc = -EBADF; 94 goto out_drop_write; 95 } 96 97 if (fd_file(src_file)->f_op->unlocked_ioctl != cifs_ioctl) { 98 rc = -EBADF; 99 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n"); 100 goto out_drop_write; 101 } 102 103 src_inode = file_inode(fd_file(src_file)); 104 rc = -EINVAL; 105 if (S_ISDIR(src_inode->i_mode)) 106 goto out_drop_write; 107 108 rc = cifs_file_copychunk_range(xid, fd_file(src_file), 0, dst_file, 0, 109 src_inode->i_size, 0); 110 if (rc > 0) 111 rc = 0; 112 out_drop_write: 113 mnt_drop_write_file(dst_file); 114 return rc; 115 } 116 117 static long smb_mnt_get_tcon_info(struct cifs_tcon *tcon, void __user *arg) 118 { 119 int rc = 0; 120 struct smb_mnt_tcon_info tcon_inf; 121 122 tcon_inf.tid = tcon->tid; 123 tcon_inf.session_id = tcon->ses->Suid; 124 125 if (copy_to_user(arg, &tcon_inf, sizeof(struct smb_mnt_tcon_info))) 126 rc = -EFAULT; 127 128 return rc; 129 } 130 131 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon, 132 void __user *arg) 133 { 134 int rc = 0; 135 struct smb_mnt_fs_info *fsinf; 136 137 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL); 138 if (fsinf == NULL) 139 return -ENOMEM; 140 141 fsinf->version = 1; 142 fsinf->protocol_id = tcon->ses->server->vals->protocol_id; 143 fsinf->tcon_flags = tcon->Flags; 144 fsinf->device_characteristics = 145 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics); 146 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType); 147 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes); 148 fsinf->max_path_component = 149 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); 150 fsinf->vol_serial_number = tcon->vol_serial_number; 151 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time); 152 fsinf->share_flags = tcon->share_flags; 153 fsinf->share_caps = le32_to_cpu(tcon->capabilities); 154 fsinf->sector_flags = tcon->ss_flags; 155 fsinf->optimal_sector_size = tcon->perf_sector_size; 156 fsinf->max_bytes_chunk = tcon->max_bytes_chunk; 157 fsinf->maximal_access = tcon->maximal_access; 158 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 159 160 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info))) 161 rc = -EFAULT; 162 163 kfree(fsinf); 164 return rc; 165 } 166 167 static int cifs_shutdown(struct super_block *sb, unsigned long arg) 168 { 169 struct cifs_sb_info *sbi = CIFS_SB(sb); 170 struct tcon_link *tlink; 171 struct cifs_tcon *tcon; 172 __u32 flags; 173 int rc; 174 175 if (!capable(CAP_SYS_ADMIN)) 176 return -EPERM; 177 178 if (get_user(flags, (__u32 __user *)arg)) 179 return -EFAULT; 180 181 tlink = cifs_sb_tlink(sbi); 182 if (IS_ERR(tlink)) 183 return PTR_ERR(tlink); 184 tcon = tlink_tcon(tlink); 185 186 trace_smb3_shutdown_enter(flags, tcon->tid); 187 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) { 188 rc = -EINVAL; 189 goto shutdown_out_err; 190 } 191 192 if (cifs_forced_shutdown(sbi)) 193 goto shutdown_good; 194 195 cifs_dbg(VFS, "shut down requested (%d)", flags); 196 197 /* 198 * see: 199 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html 200 * for more information and description of original intent of the flags 201 */ 202 switch (flags) { 203 /* 204 * We could add support later for default flag which requires: 205 * "Flush all dirty data and metadata to disk" 206 * would need to call syncfs or equivalent to flush page cache for 207 * the mount and then issue fsync to server (if nostrictsync not set) 208 */ 209 case CIFS_GOING_FLAGS_DEFAULT: 210 cifs_dbg(FYI, "shutdown with default flag not supported\n"); 211 rc = -EINVAL; 212 goto shutdown_out_err; 213 /* 214 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not 215 * data) but metadata writes are not cached on the client, so can treat 216 * it similarly to NOLOGFLUSH 217 */ 218 case CIFS_GOING_FLAGS_LOGFLUSH: 219 case CIFS_GOING_FLAGS_NOLOGFLUSH: 220 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; 221 goto shutdown_good; 222 default: 223 rc = -EINVAL; 224 goto shutdown_out_err; 225 } 226 227 shutdown_good: 228 trace_smb3_shutdown_done(flags, tcon->tid); 229 cifs_put_tlink(tlink); 230 return 0; 231 shutdown_out_err: 232 trace_smb3_shutdown_err(rc, flags, tcon->tid); 233 cifs_put_tlink(tlink); 234 return rc; 235 } 236 237 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) 238 { 239 struct smb3_full_key_debug_info out; 240 struct cifs_ses *ses; 241 int rc = 0; 242 bool found = false; 243 u8 __user *end; 244 245 if (!smb3_encryption_required(tcon)) { 246 rc = -EOPNOTSUPP; 247 goto out; 248 } 249 250 /* copy user input into our output buffer */ 251 if (copy_from_user(&out, in, sizeof(out))) { 252 rc = -EINVAL; 253 goto out; 254 } 255 256 if (!out.session_id) { 257 /* if ses id is 0, use current user session */ 258 ses = tcon->ses; 259 } else { 260 /* otherwise if a session id is given, look for it in all our sessions */ 261 struct cifs_ses *ses_it = NULL; 262 struct TCP_Server_Info *server_it = NULL; 263 264 spin_lock(&cifs_tcp_ses_lock); 265 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { 266 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { 267 spin_lock(&ses_it->ses_lock); 268 if (ses_it->ses_status != SES_EXITING && 269 ses_it->Suid == out.session_id) { 270 ses = ses_it; 271 /* 272 * since we are using the session outside the crit 273 * section, we need to make sure it won't be released 274 * so increment its refcount 275 */ 276 cifs_smb_ses_inc_refcount(ses); 277 spin_unlock(&ses_it->ses_lock); 278 found = true; 279 goto search_end; 280 } 281 spin_unlock(&ses_it->ses_lock); 282 } 283 } 284 search_end: 285 spin_unlock(&cifs_tcp_ses_lock); 286 if (!found) { 287 rc = -ENOENT; 288 goto out; 289 } 290 } 291 292 switch (ses->server->cipher_type) { 293 case SMB2_ENCRYPTION_AES128_CCM: 294 case SMB2_ENCRYPTION_AES128_GCM: 295 out.session_key_length = CIFS_SESS_KEY_SIZE; 296 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; 297 break; 298 case SMB2_ENCRYPTION_AES256_CCM: 299 case SMB2_ENCRYPTION_AES256_GCM: 300 out.session_key_length = CIFS_SESS_KEY_SIZE; 301 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; 302 break; 303 default: 304 rc = -EOPNOTSUPP; 305 goto out; 306 } 307 308 /* check if user buffer is big enough to store all the keys */ 309 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length 310 + out.server_out_key_length) { 311 rc = -ENOBUFS; 312 goto out; 313 } 314 315 out.session_id = ses->Suid; 316 out.cipher_type = le16_to_cpu(ses->server->cipher_type); 317 318 /* overwrite user input with our output */ 319 if (copy_to_user(in, &out, sizeof(out))) { 320 rc = -EINVAL; 321 goto out; 322 } 323 324 /* append all the keys at the end of the user buffer */ 325 end = in->data; 326 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { 327 rc = -EINVAL; 328 goto out; 329 } 330 end += out.session_key_length; 331 332 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { 333 rc = -EINVAL; 334 goto out; 335 } 336 end += out.server_in_key_length; 337 338 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { 339 rc = -EINVAL; 340 goto out; 341 } 342 343 out: 344 if (found) 345 cifs_put_smb_ses(ses); 346 return rc; 347 } 348 349 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) 350 { 351 struct inode *inode = file_inode(filep); 352 struct smb3_key_debug_info pkey_inf; 353 int rc = -ENOTTY; /* strange error - but the precedent */ 354 unsigned int xid; 355 struct cifsFileInfo *pSMBFile = filep->private_data; 356 struct cifs_tcon *tcon; 357 struct tcon_link *tlink; 358 struct cifs_sb_info *cifs_sb; 359 __u64 ExtAttrBits = 0; 360 #ifdef CONFIG_CIFS_POSIX 361 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 362 __u64 caps; 363 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 364 #endif /* CONFIG_CIFS_POSIX */ 365 366 xid = get_xid(); 367 368 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); 369 if (pSMBFile == NULL) 370 trace_smb3_ioctl(xid, 0, command); 371 else 372 trace_smb3_ioctl(xid, pSMBFile->fid.persistent_fid, command); 373 374 switch (command) { 375 case FS_IOC_GETFLAGS: 376 if (pSMBFile == NULL) 377 break; 378 tcon = tlink_tcon(pSMBFile->tlink); 379 #ifdef CONFIG_CIFS_POSIX 380 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 381 caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 382 if (CIFS_UNIX_EXTATTR_CAP & caps) { 383 __u64 ExtAttrMask = 0; 384 rc = CIFSGetExtAttr(xid, tcon, 385 pSMBFile->fid.netfid, 386 &ExtAttrBits, &ExtAttrMask); 387 if (rc == 0) 388 rc = put_user(ExtAttrBits & 389 FS_FL_USER_VISIBLE, 390 (int __user *)arg); 391 if (rc != -EOPNOTSUPP) 392 break; 393 } 394 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 395 #endif /* CONFIG_CIFS_POSIX */ 396 rc = 0; 397 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { 398 /* add in the compressed bit */ 399 ExtAttrBits = FS_COMPR_FL; 400 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, 401 (int __user *)arg); 402 } 403 break; 404 case FS_IOC_SETFLAGS: 405 if (pSMBFile == NULL) 406 break; 407 tcon = tlink_tcon(pSMBFile->tlink); 408 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ 409 410 if (get_user(ExtAttrBits, (int __user *)arg)) { 411 rc = -EFAULT; 412 break; 413 } 414 415 /* 416 * if (CIFS_UNIX_EXTATTR_CAP & caps) 417 * rc = CIFSSetExtAttr(xid, tcon, 418 * pSMBFile->fid.netfid, 419 * extAttrBits, 420 * &ExtAttrMask); 421 * if (rc != -EOPNOTSUPP) 422 * break; 423 */ 424 425 /* Currently only flag we can set is compressed flag */ 426 if ((ExtAttrBits & FS_COMPR_FL) == 0) 427 break; 428 429 /* Try to set compress flag */ 430 if (tcon->ses->server->ops->set_compression) { 431 rc = tcon->ses->server->ops->set_compression( 432 xid, tcon, pSMBFile); 433 cifs_dbg(FYI, "set compress flag rc %d\n", rc); 434 } 435 break; 436 case CIFS_IOC_COPYCHUNK_FILE: 437 rc = cifs_ioctl_copychunk(xid, filep, arg); 438 break; 439 case CIFS_QUERY_INFO: 440 rc = cifs_ioctl_query_info(xid, filep, arg); 441 break; 442 case CIFS_IOC_SET_INTEGRITY: 443 if (pSMBFile == NULL) 444 break; 445 tcon = tlink_tcon(pSMBFile->tlink); 446 if (tcon->ses->server->ops->set_integrity) 447 rc = tcon->ses->server->ops->set_integrity(xid, 448 tcon, pSMBFile); 449 else 450 rc = -EOPNOTSUPP; 451 break; 452 case CIFS_IOC_GET_MNT_INFO: 453 if (pSMBFile == NULL) 454 break; 455 tcon = tlink_tcon(pSMBFile->tlink); 456 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); 457 break; 458 case CIFS_IOC_GET_TCON_INFO: 459 cifs_sb = CIFS_SB(inode->i_sb); 460 tlink = cifs_sb_tlink(cifs_sb); 461 if (IS_ERR(tlink)) { 462 rc = PTR_ERR(tlink); 463 break; 464 } 465 tcon = tlink_tcon(tlink); 466 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg); 467 cifs_put_tlink(tlink); 468 break; 469 case CIFS_ENUMERATE_SNAPSHOTS: 470 if (pSMBFile == NULL) 471 break; 472 if (arg == 0) { 473 rc = -EINVAL; 474 goto cifs_ioc_exit; 475 } 476 tcon = tlink_tcon(pSMBFile->tlink); 477 if (tcon->ses->server->ops->enum_snapshots) 478 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, 479 pSMBFile, (void __user *)arg); 480 else 481 rc = -EOPNOTSUPP; 482 break; 483 case CIFS_DUMP_KEY: 484 /* 485 * Dump encryption keys. This is an old ioctl that only 486 * handles AES-128-{CCM,GCM}. 487 */ 488 if (!capable(CAP_SYS_ADMIN)) { 489 rc = -EACCES; 490 break; 491 } 492 493 cifs_sb = CIFS_SB(inode->i_sb); 494 tlink = cifs_sb_tlink(cifs_sb); 495 if (IS_ERR(tlink)) { 496 rc = PTR_ERR(tlink); 497 break; 498 } 499 tcon = tlink_tcon(tlink); 500 if (!smb3_encryption_required(tcon)) { 501 rc = -EOPNOTSUPP; 502 cifs_put_tlink(tlink); 503 break; 504 } 505 pkey_inf.cipher_type = 506 le16_to_cpu(tcon->ses->server->cipher_type); 507 pkey_inf.Suid = tcon->ses->Suid; 508 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 509 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); 510 memcpy(pkey_inf.smb3decryptionkey, 511 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); 512 memcpy(pkey_inf.smb3encryptionkey, 513 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); 514 if (copy_to_user((void __user *)arg, &pkey_inf, 515 sizeof(struct smb3_key_debug_info))) 516 rc = -EFAULT; 517 else 518 rc = 0; 519 cifs_put_tlink(tlink); 520 break; 521 case CIFS_DUMP_FULL_KEY: 522 /* 523 * Dump encryption keys (handles any key sizes) 524 */ 525 if (pSMBFile == NULL) 526 break; 527 if (!capable(CAP_SYS_ADMIN)) { 528 rc = -EACCES; 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 } 537 538 tcon = tlink_tcon(tlink); 539 rc = cifs_dump_full_key(tcon, (void __user *)arg); 540 cifs_put_tlink(tlink); 541 break; 542 case CIFS_IOC_NOTIFY: 543 if (!S_ISDIR(inode->i_mode)) { 544 /* Notify can only be done on directories */ 545 rc = -EOPNOTSUPP; 546 break; 547 } 548 cifs_sb = CIFS_SB(inode->i_sb); 549 tlink = cifs_sb_tlink(cifs_sb); 550 if (IS_ERR(tlink)) { 551 rc = PTR_ERR(tlink); 552 break; 553 } 554 tcon = tlink_tcon(tlink); 555 if (tcon && tcon->ses->server->ops->notify) { 556 rc = tcon->ses->server->ops->notify(xid, 557 filep, (void __user *)arg, 558 false /* no ret data */); 559 cifs_dbg(FYI, "ioctl notify rc %d\n", rc); 560 } else 561 rc = -EOPNOTSUPP; 562 cifs_put_tlink(tlink); 563 break; 564 case CIFS_IOC_NOTIFY_INFO: 565 if (!S_ISDIR(inode->i_mode)) { 566 /* Notify can only be done on directories */ 567 rc = -EOPNOTSUPP; 568 break; 569 } 570 cifs_sb = CIFS_SB(inode->i_sb); 571 tlink = cifs_sb_tlink(cifs_sb); 572 if (IS_ERR(tlink)) { 573 rc = PTR_ERR(tlink); 574 break; 575 } 576 tcon = tlink_tcon(tlink); 577 if (tcon && tcon->ses->server->ops->notify) { 578 rc = tcon->ses->server->ops->notify(xid, 579 filep, (void __user *)arg, 580 true /* return details */); 581 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc); 582 } else 583 rc = -EOPNOTSUPP; 584 cifs_put_tlink(tlink); 585 break; 586 case CIFS_IOC_SHUTDOWN: 587 rc = cifs_shutdown(inode->i_sb, arg); 588 break; 589 default: 590 cifs_dbg(FYI, "unsupported ioctl\n"); 591 break; 592 } 593 cifs_ioc_exit: 594 free_xid(xid); 595 return rc; 596 } 597