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