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 cifs_put_tlink(tlink); 233 return 0; 234 shutdown_out_err: 235 trace_smb3_shutdown_err(rc, flags, tcon->tid); 236 cifs_put_tlink(tlink); 237 return rc; 238 } 239 240 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) 241 { 242 struct smb3_full_key_debug_info out; 243 struct cifs_ses *ses; 244 int rc = 0; 245 bool found = false; 246 u8 __user *end; 247 248 if (!smb3_encryption_required(tcon)) { 249 rc = -EOPNOTSUPP; 250 goto out; 251 } 252 253 /* copy user input into our output buffer */ 254 if (copy_from_user(&out, in, sizeof(out))) { 255 rc = -EINVAL; 256 goto out; 257 } 258 259 if (!out.session_id) { 260 /* if ses id is 0, use current user session */ 261 ses = tcon->ses; 262 } else { 263 /* otherwise if a session id is given, look for it in all our sessions */ 264 struct cifs_ses *ses_it = NULL; 265 struct TCP_Server_Info *server_it = NULL; 266 267 spin_lock(&cifs_tcp_ses_lock); 268 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { 269 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { 270 spin_lock(&ses_it->ses_lock); 271 if (ses_it->ses_status != SES_EXITING && 272 ses_it->Suid == out.session_id) { 273 ses = ses_it; 274 /* 275 * since we are using the session outside the crit 276 * section, we need to make sure it won't be released 277 * so increment its refcount 278 */ 279 cifs_smb_ses_inc_refcount(ses); 280 spin_unlock(&ses_it->ses_lock); 281 found = true; 282 goto search_end; 283 } 284 spin_unlock(&ses_it->ses_lock); 285 } 286 } 287 search_end: 288 spin_unlock(&cifs_tcp_ses_lock); 289 if (!found) { 290 rc = -ENOENT; 291 goto out; 292 } 293 } 294 295 switch (ses->server->cipher_type) { 296 case SMB2_ENCRYPTION_AES128_CCM: 297 case SMB2_ENCRYPTION_AES128_GCM: 298 out.session_key_length = CIFS_SESS_KEY_SIZE; 299 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; 300 break; 301 case SMB2_ENCRYPTION_AES256_CCM: 302 case SMB2_ENCRYPTION_AES256_GCM: 303 out.session_key_length = CIFS_SESS_KEY_SIZE; 304 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; 305 break; 306 default: 307 rc = -EOPNOTSUPP; 308 goto out; 309 } 310 311 /* check if user buffer is big enough to store all the keys */ 312 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length 313 + out.server_out_key_length) { 314 rc = -ENOBUFS; 315 goto out; 316 } 317 318 out.session_id = ses->Suid; 319 out.cipher_type = le16_to_cpu(ses->server->cipher_type); 320 321 /* overwrite user input with our output */ 322 if (copy_to_user(in, &out, sizeof(out))) { 323 rc = -EINVAL; 324 goto out; 325 } 326 327 /* append all the keys at the end of the user buffer */ 328 end = in->data; 329 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { 330 rc = -EINVAL; 331 goto out; 332 } 333 end += out.session_key_length; 334 335 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { 336 rc = -EINVAL; 337 goto out; 338 } 339 end += out.server_in_key_length; 340 341 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { 342 rc = -EINVAL; 343 goto out; 344 } 345 346 out: 347 if (found) 348 cifs_put_smb_ses(ses); 349 return rc; 350 } 351 352 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) 353 { 354 struct inode *inode = file_inode(filep); 355 struct smb3_key_debug_info pkey_inf; 356 int rc = -ENOTTY; /* strange error - but the precedent */ 357 unsigned int xid; 358 struct cifsFileInfo *pSMBFile = filep->private_data; 359 struct cifs_tcon *tcon; 360 struct tcon_link *tlink; 361 struct cifs_sb_info *cifs_sb; 362 __u64 ExtAttrBits = 0; 363 #ifdef CONFIG_CIFS_POSIX 364 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 365 __u64 caps; 366 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 367 #endif /* CONFIG_CIFS_POSIX */ 368 369 xid = get_xid(); 370 371 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); 372 if (pSMBFile == NULL) 373 trace_smb3_ioctl(xid, 0, command); 374 else 375 trace_smb3_ioctl(xid, pSMBFile->fid.persistent_fid, command); 376 377 switch (command) { 378 case FS_IOC_GETFLAGS: 379 if (pSMBFile == NULL) 380 break; 381 tcon = tlink_tcon(pSMBFile->tlink); 382 #ifdef CONFIG_CIFS_POSIX 383 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 384 caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 385 if (CIFS_UNIX_EXTATTR_CAP & caps) { 386 __u64 ExtAttrMask = 0; 387 rc = CIFSGetExtAttr(xid, tcon, 388 pSMBFile->fid.netfid, 389 &ExtAttrBits, &ExtAttrMask); 390 if (rc == 0) 391 rc = put_user(ExtAttrBits & 392 FS_FL_USER_VISIBLE, 393 (int __user *)arg); 394 if (rc != -EOPNOTSUPP) 395 break; 396 } 397 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 398 #endif /* CONFIG_CIFS_POSIX */ 399 rc = 0; 400 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { 401 /* add in the compressed bit */ 402 ExtAttrBits = FS_COMPR_FL; 403 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, 404 (int __user *)arg); 405 } 406 break; 407 case FS_IOC_SETFLAGS: 408 if (pSMBFile == NULL) 409 break; 410 tcon = tlink_tcon(pSMBFile->tlink); 411 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ 412 413 if (get_user(ExtAttrBits, (int __user *)arg)) { 414 rc = -EFAULT; 415 break; 416 } 417 418 /* 419 * if (CIFS_UNIX_EXTATTR_CAP & caps) 420 * rc = CIFSSetExtAttr(xid, tcon, 421 * pSMBFile->fid.netfid, 422 * extAttrBits, 423 * &ExtAttrMask); 424 * if (rc != -EOPNOTSUPP) 425 * break; 426 */ 427 428 /* Currently only flag we can set is compressed flag */ 429 if ((ExtAttrBits & FS_COMPR_FL) == 0) 430 break; 431 432 /* Try to set compress flag */ 433 if (tcon->ses->server->ops->set_compression) { 434 rc = tcon->ses->server->ops->set_compression( 435 xid, tcon, pSMBFile); 436 cifs_dbg(FYI, "set compress flag rc %d\n", rc); 437 } 438 break; 439 case CIFS_IOC_COPYCHUNK_FILE: 440 rc = cifs_ioctl_copychunk(xid, filep, arg); 441 break; 442 case CIFS_QUERY_INFO: 443 rc = cifs_ioctl_query_info(xid, filep, arg); 444 break; 445 case CIFS_IOC_SET_INTEGRITY: 446 if (pSMBFile == NULL) 447 break; 448 tcon = tlink_tcon(pSMBFile->tlink); 449 if (tcon->ses->server->ops->set_integrity) 450 rc = tcon->ses->server->ops->set_integrity(xid, 451 tcon, pSMBFile); 452 else 453 rc = -EOPNOTSUPP; 454 break; 455 case CIFS_IOC_GET_MNT_INFO: 456 if (pSMBFile == NULL) 457 break; 458 tcon = tlink_tcon(pSMBFile->tlink); 459 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); 460 break; 461 case CIFS_IOC_GET_TCON_INFO: 462 cifs_sb = CIFS_SB(inode->i_sb); 463 tlink = cifs_sb_tlink(cifs_sb); 464 if (IS_ERR(tlink)) { 465 rc = PTR_ERR(tlink); 466 break; 467 } 468 tcon = tlink_tcon(tlink); 469 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg); 470 cifs_put_tlink(tlink); 471 break; 472 case CIFS_ENUMERATE_SNAPSHOTS: 473 if (pSMBFile == NULL) 474 break; 475 if (arg == 0) { 476 rc = -EINVAL; 477 goto cifs_ioc_exit; 478 } 479 tcon = tlink_tcon(pSMBFile->tlink); 480 if (tcon->ses->server->ops->enum_snapshots) 481 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, 482 pSMBFile, (void __user *)arg); 483 else 484 rc = -EOPNOTSUPP; 485 break; 486 case CIFS_DUMP_KEY: 487 /* 488 * Dump encryption keys. This is an old ioctl that only 489 * handles AES-128-{CCM,GCM}. 490 */ 491 if (!capable(CAP_SYS_ADMIN)) { 492 rc = -EACCES; 493 break; 494 } 495 496 cifs_sb = CIFS_SB(inode->i_sb); 497 tlink = cifs_sb_tlink(cifs_sb); 498 if (IS_ERR(tlink)) { 499 rc = PTR_ERR(tlink); 500 break; 501 } 502 tcon = tlink_tcon(tlink); 503 if (!smb3_encryption_required(tcon)) { 504 rc = -EOPNOTSUPP; 505 cifs_put_tlink(tlink); 506 break; 507 } 508 pkey_inf.cipher_type = 509 le16_to_cpu(tcon->ses->server->cipher_type); 510 pkey_inf.Suid = tcon->ses->Suid; 511 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 512 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); 513 memcpy(pkey_inf.smb3decryptionkey, 514 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); 515 memcpy(pkey_inf.smb3encryptionkey, 516 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); 517 if (copy_to_user((void __user *)arg, &pkey_inf, 518 sizeof(struct smb3_key_debug_info))) 519 rc = -EFAULT; 520 else 521 rc = 0; 522 cifs_put_tlink(tlink); 523 break; 524 case CIFS_DUMP_FULL_KEY: 525 /* 526 * Dump encryption keys (handles any key sizes) 527 */ 528 if (pSMBFile == NULL) 529 break; 530 if (!capable(CAP_SYS_ADMIN)) { 531 rc = -EACCES; 532 break; 533 } 534 cifs_sb = CIFS_SB(inode->i_sb); 535 tlink = cifs_sb_tlink(cifs_sb); 536 if (IS_ERR(tlink)) { 537 rc = PTR_ERR(tlink); 538 break; 539 } 540 541 tcon = tlink_tcon(tlink); 542 rc = cifs_dump_full_key(tcon, (void __user *)arg); 543 cifs_put_tlink(tlink); 544 break; 545 case CIFS_IOC_NOTIFY: 546 if (!S_ISDIR(inode->i_mode)) { 547 /* Notify can only be done on directories */ 548 rc = -EOPNOTSUPP; 549 break; 550 } 551 cifs_sb = CIFS_SB(inode->i_sb); 552 tlink = cifs_sb_tlink(cifs_sb); 553 if (IS_ERR(tlink)) { 554 rc = PTR_ERR(tlink); 555 break; 556 } 557 tcon = tlink_tcon(tlink); 558 if (tcon && tcon->ses->server->ops->notify) { 559 rc = tcon->ses->server->ops->notify(xid, 560 filep, (void __user *)arg, 561 false /* no ret data */); 562 cifs_dbg(FYI, "ioctl notify rc %d\n", rc); 563 } else 564 rc = -EOPNOTSUPP; 565 cifs_put_tlink(tlink); 566 break; 567 case CIFS_IOC_NOTIFY_INFO: 568 if (!S_ISDIR(inode->i_mode)) { 569 /* Notify can only be done on directories */ 570 rc = -EOPNOTSUPP; 571 break; 572 } 573 cifs_sb = CIFS_SB(inode->i_sb); 574 tlink = cifs_sb_tlink(cifs_sb); 575 if (IS_ERR(tlink)) { 576 rc = PTR_ERR(tlink); 577 break; 578 } 579 tcon = tlink_tcon(tlink); 580 if (tcon && tcon->ses->server->ops->notify) { 581 rc = tcon->ses->server->ops->notify(xid, 582 filep, (void __user *)arg, 583 true /* return details */); 584 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc); 585 } else 586 rc = -EOPNOTSUPP; 587 cifs_put_tlink(tlink); 588 break; 589 case CIFS_IOC_SHUTDOWN: 590 rc = cifs_shutdown(inode->i_sb, arg); 591 break; 592 default: 593 cifs_dbg(FYI, "unsupported ioctl\n"); 594 break; 595 } 596 cifs_ioc_exit: 597 free_xid(xid); 598 return rc; 599 } 600