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 struct tcon_link *tlink; 174 struct cifs_tcon *tcon; 175 __u32 flags; 176 int rc; 177 178 if (!capable(CAP_SYS_ADMIN)) 179 return -EPERM; 180 181 if (get_user(flags, (__u32 __user *)arg)) 182 return -EFAULT; 183 184 tlink = cifs_sb_tlink(sbi); 185 if (IS_ERR(tlink)) 186 return PTR_ERR(tlink); 187 tcon = tlink_tcon(tlink); 188 189 trace_smb3_shutdown_enter(flags, tcon->tid); 190 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) { 191 rc = -EINVAL; 192 goto shutdown_out_err; 193 } 194 195 if (cifs_forced_shutdown(sbi)) 196 goto shutdown_good; 197 198 cifs_dbg(VFS, "shut down requested (%d)", flags); 199 200 /* 201 * see: 202 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html 203 * for more information and description of original intent of the flags 204 */ 205 switch (flags) { 206 /* 207 * We could add support later for default flag which requires: 208 * "Flush all dirty data and metadata to disk" 209 * would need to call syncfs or equivalent to flush page cache for 210 * the mount and then issue fsync to server (if nostrictsync not set) 211 */ 212 case CIFS_GOING_FLAGS_DEFAULT: 213 cifs_dbg(FYI, "shutdown with default flag not supported\n"); 214 rc = -EINVAL; 215 goto shutdown_out_err; 216 /* 217 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not 218 * data) but metadata writes are not cached on the client, so can treat 219 * it similarly to NOLOGFLUSH 220 */ 221 case CIFS_GOING_FLAGS_LOGFLUSH: 222 case CIFS_GOING_FLAGS_NOLOGFLUSH: 223 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; 224 goto shutdown_good; 225 default: 226 rc = -EINVAL; 227 goto shutdown_out_err; 228 } 229 230 shutdown_good: 231 trace_smb3_shutdown_done(flags, tcon->tid); 232 return 0; 233 shutdown_out_err: 234 trace_smb3_shutdown_err(rc, flags, tcon->tid); 235 return rc; 236 } 237 238 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) 239 { 240 struct smb3_full_key_debug_info out; 241 struct cifs_ses *ses; 242 int rc = 0; 243 bool found = false; 244 u8 __user *end; 245 246 if (!smb3_encryption_required(tcon)) { 247 rc = -EOPNOTSUPP; 248 goto out; 249 } 250 251 /* copy user input into our output buffer */ 252 if (copy_from_user(&out, in, sizeof(out))) { 253 rc = -EINVAL; 254 goto out; 255 } 256 257 if (!out.session_id) { 258 /* if ses id is 0, use current user session */ 259 ses = tcon->ses; 260 } else { 261 /* otherwise if a session id is given, look for it in all our sessions */ 262 struct cifs_ses *ses_it = NULL; 263 struct TCP_Server_Info *server_it = NULL; 264 265 spin_lock(&cifs_tcp_ses_lock); 266 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { 267 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { 268 spin_lock(&ses_it->ses_lock); 269 if (ses_it->ses_status != SES_EXITING && 270 ses_it->Suid == out.session_id) { 271 ses = ses_it; 272 /* 273 * since we are using the session outside the crit 274 * section, we need to make sure it won't be released 275 * so increment its refcount 276 */ 277 cifs_smb_ses_inc_refcount(ses); 278 spin_unlock(&ses_it->ses_lock); 279 found = true; 280 goto search_end; 281 } 282 spin_unlock(&ses_it->ses_lock); 283 } 284 } 285 search_end: 286 spin_unlock(&cifs_tcp_ses_lock); 287 if (!found) { 288 rc = -ENOENT; 289 goto out; 290 } 291 } 292 293 switch (ses->server->cipher_type) { 294 case SMB2_ENCRYPTION_AES128_CCM: 295 case SMB2_ENCRYPTION_AES128_GCM: 296 out.session_key_length = CIFS_SESS_KEY_SIZE; 297 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; 298 break; 299 case SMB2_ENCRYPTION_AES256_CCM: 300 case SMB2_ENCRYPTION_AES256_GCM: 301 out.session_key_length = CIFS_SESS_KEY_SIZE; 302 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; 303 break; 304 default: 305 rc = -EOPNOTSUPP; 306 goto out; 307 } 308 309 /* check if user buffer is big enough to store all the keys */ 310 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length 311 + out.server_out_key_length) { 312 rc = -ENOBUFS; 313 goto out; 314 } 315 316 out.session_id = ses->Suid; 317 out.cipher_type = le16_to_cpu(ses->server->cipher_type); 318 319 /* overwrite user input with our output */ 320 if (copy_to_user(in, &out, sizeof(out))) { 321 rc = -EINVAL; 322 goto out; 323 } 324 325 /* append all the keys at the end of the user buffer */ 326 end = in->data; 327 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { 328 rc = -EINVAL; 329 goto out; 330 } 331 end += out.session_key_length; 332 333 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { 334 rc = -EINVAL; 335 goto out; 336 } 337 end += out.server_in_key_length; 338 339 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { 340 rc = -EINVAL; 341 goto out; 342 } 343 344 out: 345 if (found) 346 cifs_put_smb_ses(ses); 347 return rc; 348 } 349 350 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) 351 { 352 struct inode *inode = file_inode(filep); 353 struct smb3_key_debug_info pkey_inf; 354 int rc = -ENOTTY; /* strange error - but the precedent */ 355 unsigned int xid; 356 struct cifsFileInfo *pSMBFile = filep->private_data; 357 struct cifs_tcon *tcon; 358 struct tcon_link *tlink; 359 struct cifs_sb_info *cifs_sb; 360 __u64 ExtAttrBits = 0; 361 #ifdef CONFIG_CIFS_POSIX 362 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 363 __u64 caps; 364 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 365 #endif /* CONFIG_CIFS_POSIX */ 366 367 xid = get_xid(); 368 369 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); 370 if (pSMBFile == NULL) 371 trace_smb3_ioctl(xid, 0, command); 372 else 373 trace_smb3_ioctl(xid, pSMBFile->fid.persistent_fid, command); 374 375 switch (command) { 376 case FS_IOC_GETFLAGS: 377 if (pSMBFile == NULL) 378 break; 379 tcon = tlink_tcon(pSMBFile->tlink); 380 #ifdef CONFIG_CIFS_POSIX 381 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 382 caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 383 if (CIFS_UNIX_EXTATTR_CAP & caps) { 384 __u64 ExtAttrMask = 0; 385 rc = CIFSGetExtAttr(xid, tcon, 386 pSMBFile->fid.netfid, 387 &ExtAttrBits, &ExtAttrMask); 388 if (rc == 0) 389 rc = put_user(ExtAttrBits & 390 FS_FL_USER_VISIBLE, 391 (int __user *)arg); 392 if (rc != -EOPNOTSUPP) 393 break; 394 } 395 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 396 #endif /* CONFIG_CIFS_POSIX */ 397 rc = 0; 398 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { 399 /* add in the compressed bit */ 400 ExtAttrBits = FS_COMPR_FL; 401 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, 402 (int __user *)arg); 403 } 404 break; 405 case FS_IOC_SETFLAGS: 406 if (pSMBFile == NULL) 407 break; 408 tcon = tlink_tcon(pSMBFile->tlink); 409 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ 410 411 if (get_user(ExtAttrBits, (int __user *)arg)) { 412 rc = -EFAULT; 413 break; 414 } 415 416 /* 417 * if (CIFS_UNIX_EXTATTR_CAP & caps) 418 * rc = CIFSSetExtAttr(xid, tcon, 419 * pSMBFile->fid.netfid, 420 * extAttrBits, 421 * &ExtAttrMask); 422 * if (rc != -EOPNOTSUPP) 423 * break; 424 */ 425 426 /* Currently only flag we can set is compressed flag */ 427 if ((ExtAttrBits & FS_COMPR_FL) == 0) 428 break; 429 430 /* Try to set compress flag */ 431 if (tcon->ses->server->ops->set_compression) { 432 rc = tcon->ses->server->ops->set_compression( 433 xid, tcon, pSMBFile); 434 cifs_dbg(FYI, "set compress flag rc %d\n", rc); 435 } 436 break; 437 case CIFS_IOC_COPYCHUNK_FILE: 438 rc = cifs_ioctl_copychunk(xid, filep, arg); 439 break; 440 case CIFS_QUERY_INFO: 441 rc = cifs_ioctl_query_info(xid, filep, arg); 442 break; 443 case CIFS_IOC_SET_INTEGRITY: 444 if (pSMBFile == NULL) 445 break; 446 tcon = tlink_tcon(pSMBFile->tlink); 447 if (tcon->ses->server->ops->set_integrity) 448 rc = tcon->ses->server->ops->set_integrity(xid, 449 tcon, pSMBFile); 450 else 451 rc = -EOPNOTSUPP; 452 break; 453 case CIFS_IOC_GET_MNT_INFO: 454 if (pSMBFile == NULL) 455 break; 456 tcon = tlink_tcon(pSMBFile->tlink); 457 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); 458 break; 459 case CIFS_IOC_GET_TCON_INFO: 460 cifs_sb = CIFS_SB(inode->i_sb); 461 tlink = cifs_sb_tlink(cifs_sb); 462 if (IS_ERR(tlink)) { 463 rc = PTR_ERR(tlink); 464 break; 465 } 466 tcon = tlink_tcon(tlink); 467 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg); 468 cifs_put_tlink(tlink); 469 break; 470 case CIFS_ENUMERATE_SNAPSHOTS: 471 if (pSMBFile == NULL) 472 break; 473 if (arg == 0) { 474 rc = -EINVAL; 475 goto cifs_ioc_exit; 476 } 477 tcon = tlink_tcon(pSMBFile->tlink); 478 if (tcon->ses->server->ops->enum_snapshots) 479 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, 480 pSMBFile, (void __user *)arg); 481 else 482 rc = -EOPNOTSUPP; 483 break; 484 case CIFS_DUMP_KEY: 485 /* 486 * Dump encryption keys. This is an old ioctl that only 487 * handles AES-128-{CCM,GCM}. 488 */ 489 if (!capable(CAP_SYS_ADMIN)) { 490 rc = -EACCES; 491 break; 492 } 493 494 cifs_sb = CIFS_SB(inode->i_sb); 495 tlink = cifs_sb_tlink(cifs_sb); 496 if (IS_ERR(tlink)) { 497 rc = PTR_ERR(tlink); 498 break; 499 } 500 tcon = tlink_tcon(tlink); 501 if (!smb3_encryption_required(tcon)) { 502 rc = -EOPNOTSUPP; 503 cifs_put_tlink(tlink); 504 break; 505 } 506 pkey_inf.cipher_type = 507 le16_to_cpu(tcon->ses->server->cipher_type); 508 pkey_inf.Suid = tcon->ses->Suid; 509 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 510 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); 511 memcpy(pkey_inf.smb3decryptionkey, 512 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); 513 memcpy(pkey_inf.smb3encryptionkey, 514 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); 515 if (copy_to_user((void __user *)arg, &pkey_inf, 516 sizeof(struct smb3_key_debug_info))) 517 rc = -EFAULT; 518 else 519 rc = 0; 520 cifs_put_tlink(tlink); 521 break; 522 case CIFS_DUMP_FULL_KEY: 523 /* 524 * Dump encryption keys (handles any key sizes) 525 */ 526 if (pSMBFile == NULL) 527 break; 528 if (!capable(CAP_SYS_ADMIN)) { 529 rc = -EACCES; 530 break; 531 } 532 cifs_sb = CIFS_SB(inode->i_sb); 533 tlink = cifs_sb_tlink(cifs_sb); 534 if (IS_ERR(tlink)) { 535 rc = PTR_ERR(tlink); 536 break; 537 } 538 539 tcon = tlink_tcon(tlink); 540 rc = cifs_dump_full_key(tcon, (void __user *)arg); 541 cifs_put_tlink(tlink); 542 break; 543 case CIFS_IOC_NOTIFY: 544 if (!S_ISDIR(inode->i_mode)) { 545 /* Notify can only be done on directories */ 546 rc = -EOPNOTSUPP; 547 break; 548 } 549 cifs_sb = CIFS_SB(inode->i_sb); 550 tlink = cifs_sb_tlink(cifs_sb); 551 if (IS_ERR(tlink)) { 552 rc = PTR_ERR(tlink); 553 break; 554 } 555 tcon = tlink_tcon(tlink); 556 if (tcon && tcon->ses->server->ops->notify) { 557 rc = tcon->ses->server->ops->notify(xid, 558 filep, (void __user *)arg, 559 false /* no ret data */); 560 cifs_dbg(FYI, "ioctl notify rc %d\n", rc); 561 } else 562 rc = -EOPNOTSUPP; 563 cifs_put_tlink(tlink); 564 break; 565 case CIFS_IOC_NOTIFY_INFO: 566 if (!S_ISDIR(inode->i_mode)) { 567 /* Notify can only be done on directories */ 568 rc = -EOPNOTSUPP; 569 break; 570 } 571 cifs_sb = CIFS_SB(inode->i_sb); 572 tlink = cifs_sb_tlink(cifs_sb); 573 if (IS_ERR(tlink)) { 574 rc = PTR_ERR(tlink); 575 break; 576 } 577 tcon = tlink_tcon(tlink); 578 if (tcon && tcon->ses->server->ops->notify) { 579 rc = tcon->ses->server->ops->notify(xid, 580 filep, (void __user *)arg, 581 true /* return details */); 582 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc); 583 } else 584 rc = -EOPNOTSUPP; 585 cifs_put_tlink(tlink); 586 break; 587 case CIFS_IOC_SHUTDOWN: 588 rc = cifs_shutdown(inode->i_sb, arg); 589 break; 590 default: 591 cifs_dbg(FYI, "unsupported ioctl\n"); 592 break; 593 } 594 cifs_ioc_exit: 595 free_xid(xid); 596 return rc; 597 } 598