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 switch (command) { 349 case FS_IOC_GETFLAGS: 350 if (pSMBFile == NULL) 351 break; 352 tcon = tlink_tcon(pSMBFile->tlink); 353 #ifdef CONFIG_CIFS_POSIX 354 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 355 caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 356 if (CIFS_UNIX_EXTATTR_CAP & caps) { 357 __u64 ExtAttrMask = 0; 358 rc = CIFSGetExtAttr(xid, tcon, 359 pSMBFile->fid.netfid, 360 &ExtAttrBits, &ExtAttrMask); 361 if (rc == 0) 362 rc = put_user(ExtAttrBits & 363 FS_FL_USER_VISIBLE, 364 (int __user *)arg); 365 if (rc != -EOPNOTSUPP) 366 break; 367 } 368 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 369 #endif /* CONFIG_CIFS_POSIX */ 370 rc = 0; 371 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { 372 /* add in the compressed bit */ 373 ExtAttrBits = FS_COMPR_FL; 374 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, 375 (int __user *)arg); 376 } 377 break; 378 case FS_IOC_SETFLAGS: 379 if (pSMBFile == NULL) 380 break; 381 tcon = tlink_tcon(pSMBFile->tlink); 382 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ 383 384 if (get_user(ExtAttrBits, (int __user *)arg)) { 385 rc = -EFAULT; 386 break; 387 } 388 389 /* 390 * if (CIFS_UNIX_EXTATTR_CAP & caps) 391 * rc = CIFSSetExtAttr(xid, tcon, 392 * pSMBFile->fid.netfid, 393 * extAttrBits, 394 * &ExtAttrMask); 395 * if (rc != -EOPNOTSUPP) 396 * break; 397 */ 398 399 /* Currently only flag we can set is compressed flag */ 400 if ((ExtAttrBits & FS_COMPR_FL) == 0) 401 break; 402 403 /* Try to set compress flag */ 404 if (tcon->ses->server->ops->set_compression) { 405 rc = tcon->ses->server->ops->set_compression( 406 xid, tcon, pSMBFile); 407 cifs_dbg(FYI, "set compress flag rc %d\n", rc); 408 } 409 break; 410 case CIFS_IOC_COPYCHUNK_FILE: 411 rc = cifs_ioctl_copychunk(xid, filep, arg); 412 break; 413 case CIFS_QUERY_INFO: 414 rc = cifs_ioctl_query_info(xid, filep, arg); 415 break; 416 case CIFS_IOC_SET_INTEGRITY: 417 if (pSMBFile == NULL) 418 break; 419 tcon = tlink_tcon(pSMBFile->tlink); 420 if (tcon->ses->server->ops->set_integrity) 421 rc = tcon->ses->server->ops->set_integrity(xid, 422 tcon, pSMBFile); 423 else 424 rc = -EOPNOTSUPP; 425 break; 426 case CIFS_IOC_GET_MNT_INFO: 427 if (pSMBFile == NULL) 428 break; 429 tcon = tlink_tcon(pSMBFile->tlink); 430 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); 431 break; 432 case CIFS_IOC_GET_TCON_INFO: 433 cifs_sb = CIFS_SB(inode->i_sb); 434 tlink = cifs_sb_tlink(cifs_sb); 435 if (IS_ERR(tlink)) { 436 rc = PTR_ERR(tlink); 437 break; 438 } 439 tcon = tlink_tcon(tlink); 440 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg); 441 cifs_put_tlink(tlink); 442 break; 443 case CIFS_ENUMERATE_SNAPSHOTS: 444 if (pSMBFile == NULL) 445 break; 446 if (arg == 0) { 447 rc = -EINVAL; 448 goto cifs_ioc_exit; 449 } 450 tcon = tlink_tcon(pSMBFile->tlink); 451 if (tcon->ses->server->ops->enum_snapshots) 452 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, 453 pSMBFile, (void __user *)arg); 454 else 455 rc = -EOPNOTSUPP; 456 break; 457 case CIFS_DUMP_KEY: 458 /* 459 * Dump encryption keys. This is an old ioctl that only 460 * handles AES-128-{CCM,GCM}. 461 */ 462 if (!capable(CAP_SYS_ADMIN)) { 463 rc = -EACCES; 464 break; 465 } 466 467 cifs_sb = CIFS_SB(inode->i_sb); 468 tlink = cifs_sb_tlink(cifs_sb); 469 if (IS_ERR(tlink)) { 470 rc = PTR_ERR(tlink); 471 break; 472 } 473 tcon = tlink_tcon(tlink); 474 if (!smb3_encryption_required(tcon)) { 475 rc = -EOPNOTSUPP; 476 cifs_put_tlink(tlink); 477 break; 478 } 479 pkey_inf.cipher_type = 480 le16_to_cpu(tcon->ses->server->cipher_type); 481 pkey_inf.Suid = tcon->ses->Suid; 482 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 483 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); 484 memcpy(pkey_inf.smb3decryptionkey, 485 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); 486 memcpy(pkey_inf.smb3encryptionkey, 487 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); 488 if (copy_to_user((void __user *)arg, &pkey_inf, 489 sizeof(struct smb3_key_debug_info))) 490 rc = -EFAULT; 491 else 492 rc = 0; 493 cifs_put_tlink(tlink); 494 break; 495 case CIFS_DUMP_FULL_KEY: 496 /* 497 * Dump encryption keys (handles any key sizes) 498 */ 499 if (pSMBFile == NULL) 500 break; 501 if (!capable(CAP_SYS_ADMIN)) { 502 rc = -EACCES; 503 break; 504 } 505 cifs_sb = CIFS_SB(inode->i_sb); 506 tlink = cifs_sb_tlink(cifs_sb); 507 if (IS_ERR(tlink)) { 508 rc = PTR_ERR(tlink); 509 break; 510 } 511 512 tcon = tlink_tcon(tlink); 513 rc = cifs_dump_full_key(tcon, (void __user *)arg); 514 cifs_put_tlink(tlink); 515 break; 516 case CIFS_IOC_NOTIFY: 517 if (!S_ISDIR(inode->i_mode)) { 518 /* Notify can only be done on directories */ 519 rc = -EOPNOTSUPP; 520 break; 521 } 522 cifs_sb = CIFS_SB(inode->i_sb); 523 tlink = cifs_sb_tlink(cifs_sb); 524 if (IS_ERR(tlink)) { 525 rc = PTR_ERR(tlink); 526 break; 527 } 528 tcon = tlink_tcon(tlink); 529 if (tcon && tcon->ses->server->ops->notify) { 530 rc = tcon->ses->server->ops->notify(xid, 531 filep, (void __user *)arg, 532 false /* no ret data */); 533 cifs_dbg(FYI, "ioctl notify rc %d\n", rc); 534 } else 535 rc = -EOPNOTSUPP; 536 cifs_put_tlink(tlink); 537 break; 538 case CIFS_IOC_NOTIFY_INFO: 539 if (!S_ISDIR(inode->i_mode)) { 540 /* Notify can only be done on directories */ 541 rc = -EOPNOTSUPP; 542 break; 543 } 544 cifs_sb = CIFS_SB(inode->i_sb); 545 tlink = cifs_sb_tlink(cifs_sb); 546 if (IS_ERR(tlink)) { 547 rc = PTR_ERR(tlink); 548 break; 549 } 550 tcon = tlink_tcon(tlink); 551 if (tcon && tcon->ses->server->ops->notify) { 552 rc = tcon->ses->server->ops->notify(xid, 553 filep, (void __user *)arg, 554 true /* return details */); 555 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc); 556 } else 557 rc = -EOPNOTSUPP; 558 cifs_put_tlink(tlink); 559 break; 560 case CIFS_IOC_SHUTDOWN: 561 rc = cifs_shutdown(inode->i_sb, arg); 562 break; 563 default: 564 cifs_dbg(FYI, "unsupported ioctl\n"); 565 break; 566 } 567 cifs_ioc_exit: 568 free_xid(xid); 569 return rc; 570 } 571