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