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->device_characteristics = 147 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics); 148 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType); 149 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes); 150 fsinf->max_path_component = 151 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); 152 fsinf->vol_serial_number = tcon->vol_serial_number; 153 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time); 154 fsinf->share_flags = tcon->share_flags; 155 fsinf->share_caps = le32_to_cpu(tcon->capabilities); 156 fsinf->sector_flags = tcon->ss_flags; 157 fsinf->optimal_sector_size = tcon->perf_sector_size; 158 fsinf->max_bytes_chunk = tcon->max_bytes_chunk; 159 fsinf->maximal_access = tcon->maximal_access; 160 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 161 162 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info))) 163 rc = -EFAULT; 164 165 kfree(fsinf); 166 return rc; 167 } 168 169 static int cifs_shutdown(struct super_block *sb, unsigned long arg) 170 { 171 struct cifs_sb_info *sbi = CIFS_SB(sb); 172 __u32 flags; 173 174 if (!capable(CAP_SYS_ADMIN)) 175 return -EPERM; 176 177 if (get_user(flags, (__u32 __user *)arg)) 178 return -EFAULT; 179 180 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) 181 return -EINVAL; 182 183 if (cifs_forced_shutdown(sbi)) 184 return 0; 185 186 cifs_dbg(VFS, "shut down requested (%d)", flags); 187 /* trace_cifs_shutdown(sb, flags);*/ 188 189 /* 190 * see: 191 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html 192 * for more information and description of original intent of the flags 193 */ 194 switch (flags) { 195 /* 196 * We could add support later for default flag which requires: 197 * "Flush all dirty data and metadata to disk" 198 * would need to call syncfs or equivalent to flush page cache for 199 * the mount and then issue fsync to server (if nostrictsync not set) 200 */ 201 case CIFS_GOING_FLAGS_DEFAULT: 202 cifs_dbg(FYI, "shutdown with default flag not supported\n"); 203 return -EINVAL; 204 /* 205 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not 206 * data) but metadata writes are not cached on the client, so can treat 207 * it similarly to NOLOGFLUSH 208 */ 209 case CIFS_GOING_FLAGS_LOGFLUSH: 210 case CIFS_GOING_FLAGS_NOLOGFLUSH: 211 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; 212 return 0; 213 default: 214 return -EINVAL; 215 } 216 return 0; 217 } 218 219 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) 220 { 221 struct smb3_full_key_debug_info out; 222 struct cifs_ses *ses; 223 int rc = 0; 224 bool found = false; 225 u8 __user *end; 226 227 if (!smb3_encryption_required(tcon)) { 228 rc = -EOPNOTSUPP; 229 goto out; 230 } 231 232 /* copy user input into our output buffer */ 233 if (copy_from_user(&out, in, sizeof(out))) { 234 rc = -EINVAL; 235 goto out; 236 } 237 238 if (!out.session_id) { 239 /* if ses id is 0, use current user session */ 240 ses = tcon->ses; 241 } else { 242 /* otherwise if a session id is given, look for it in all our sessions */ 243 struct cifs_ses *ses_it = NULL; 244 struct TCP_Server_Info *server_it = NULL; 245 246 spin_lock(&cifs_tcp_ses_lock); 247 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { 248 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { 249 spin_lock(&ses_it->ses_lock); 250 if (ses_it->ses_status != SES_EXITING && 251 ses_it->Suid == out.session_id) { 252 ses = ses_it; 253 /* 254 * since we are using the session outside the crit 255 * section, we need to make sure it won't be released 256 * so increment its refcount 257 */ 258 cifs_smb_ses_inc_refcount(ses); 259 spin_unlock(&ses_it->ses_lock); 260 found = true; 261 goto search_end; 262 } 263 spin_unlock(&ses_it->ses_lock); 264 } 265 } 266 search_end: 267 spin_unlock(&cifs_tcp_ses_lock); 268 if (!found) { 269 rc = -ENOENT; 270 goto out; 271 } 272 } 273 274 switch (ses->server->cipher_type) { 275 case SMB2_ENCRYPTION_AES128_CCM: 276 case SMB2_ENCRYPTION_AES128_GCM: 277 out.session_key_length = CIFS_SESS_KEY_SIZE; 278 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; 279 break; 280 case SMB2_ENCRYPTION_AES256_CCM: 281 case SMB2_ENCRYPTION_AES256_GCM: 282 out.session_key_length = CIFS_SESS_KEY_SIZE; 283 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; 284 break; 285 default: 286 rc = -EOPNOTSUPP; 287 goto out; 288 } 289 290 /* check if user buffer is big enough to store all the keys */ 291 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length 292 + out.server_out_key_length) { 293 rc = -ENOBUFS; 294 goto out; 295 } 296 297 out.session_id = ses->Suid; 298 out.cipher_type = le16_to_cpu(ses->server->cipher_type); 299 300 /* overwrite user input with our output */ 301 if (copy_to_user(in, &out, sizeof(out))) { 302 rc = -EINVAL; 303 goto out; 304 } 305 306 /* append all the keys at the end of the user buffer */ 307 end = in->data; 308 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { 309 rc = -EINVAL; 310 goto out; 311 } 312 end += out.session_key_length; 313 314 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { 315 rc = -EINVAL; 316 goto out; 317 } 318 end += out.server_in_key_length; 319 320 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { 321 rc = -EINVAL; 322 goto out; 323 } 324 325 out: 326 if (found) 327 cifs_put_smb_ses(ses); 328 return rc; 329 } 330 331 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) 332 { 333 struct inode *inode = file_inode(filep); 334 struct smb3_key_debug_info pkey_inf; 335 int rc = -ENOTTY; /* strange error - but the precedent */ 336 unsigned int xid; 337 struct cifsFileInfo *pSMBFile = filep->private_data; 338 struct cifs_tcon *tcon; 339 struct tcon_link *tlink; 340 struct cifs_sb_info *cifs_sb; 341 __u64 ExtAttrBits = 0; 342 #ifdef CONFIG_CIFS_POSIX 343 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 344 __u64 caps; 345 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 346 #endif /* CONFIG_CIFS_POSIX */ 347 348 xid = get_xid(); 349 350 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); 351 switch (command) { 352 case FS_IOC_GETFLAGS: 353 if (pSMBFile == NULL) 354 break; 355 tcon = tlink_tcon(pSMBFile->tlink); 356 #ifdef CONFIG_CIFS_POSIX 357 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 358 caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 359 if (CIFS_UNIX_EXTATTR_CAP & caps) { 360 __u64 ExtAttrMask = 0; 361 rc = CIFSGetExtAttr(xid, tcon, 362 pSMBFile->fid.netfid, 363 &ExtAttrBits, &ExtAttrMask); 364 if (rc == 0) 365 rc = put_user(ExtAttrBits & 366 FS_FL_USER_VISIBLE, 367 (int __user *)arg); 368 if (rc != -EOPNOTSUPP) 369 break; 370 } 371 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 372 #endif /* CONFIG_CIFS_POSIX */ 373 rc = 0; 374 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { 375 /* add in the compressed bit */ 376 ExtAttrBits = FS_COMPR_FL; 377 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, 378 (int __user *)arg); 379 } 380 break; 381 case FS_IOC_SETFLAGS: 382 if (pSMBFile == NULL) 383 break; 384 tcon = tlink_tcon(pSMBFile->tlink); 385 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ 386 387 if (get_user(ExtAttrBits, (int __user *)arg)) { 388 rc = -EFAULT; 389 break; 390 } 391 392 /* 393 * if (CIFS_UNIX_EXTATTR_CAP & caps) 394 * rc = CIFSSetExtAttr(xid, tcon, 395 * pSMBFile->fid.netfid, 396 * extAttrBits, 397 * &ExtAttrMask); 398 * if (rc != -EOPNOTSUPP) 399 * break; 400 */ 401 402 /* Currently only flag we can set is compressed flag */ 403 if ((ExtAttrBits & FS_COMPR_FL) == 0) 404 break; 405 406 /* Try to set compress flag */ 407 if (tcon->ses->server->ops->set_compression) { 408 rc = tcon->ses->server->ops->set_compression( 409 xid, tcon, pSMBFile); 410 cifs_dbg(FYI, "set compress flag rc %d\n", rc); 411 } 412 break; 413 case CIFS_IOC_COPYCHUNK_FILE: 414 rc = cifs_ioctl_copychunk(xid, filep, arg); 415 break; 416 case CIFS_QUERY_INFO: 417 rc = cifs_ioctl_query_info(xid, filep, arg); 418 break; 419 case CIFS_IOC_SET_INTEGRITY: 420 if (pSMBFile == NULL) 421 break; 422 tcon = tlink_tcon(pSMBFile->tlink); 423 if (tcon->ses->server->ops->set_integrity) 424 rc = tcon->ses->server->ops->set_integrity(xid, 425 tcon, pSMBFile); 426 else 427 rc = -EOPNOTSUPP; 428 break; 429 case CIFS_IOC_GET_MNT_INFO: 430 if (pSMBFile == NULL) 431 break; 432 tcon = tlink_tcon(pSMBFile->tlink); 433 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); 434 break; 435 case CIFS_IOC_GET_TCON_INFO: 436 cifs_sb = CIFS_SB(inode->i_sb); 437 tlink = cifs_sb_tlink(cifs_sb); 438 if (IS_ERR(tlink)) { 439 rc = PTR_ERR(tlink); 440 break; 441 } 442 tcon = tlink_tcon(tlink); 443 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg); 444 cifs_put_tlink(tlink); 445 break; 446 case CIFS_ENUMERATE_SNAPSHOTS: 447 if (pSMBFile == NULL) 448 break; 449 if (arg == 0) { 450 rc = -EINVAL; 451 goto cifs_ioc_exit; 452 } 453 tcon = tlink_tcon(pSMBFile->tlink); 454 if (tcon->ses->server->ops->enum_snapshots) 455 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, 456 pSMBFile, (void __user *)arg); 457 else 458 rc = -EOPNOTSUPP; 459 break; 460 case CIFS_DUMP_KEY: 461 /* 462 * Dump encryption keys. This is an old ioctl that only 463 * handles AES-128-{CCM,GCM}. 464 */ 465 if (!capable(CAP_SYS_ADMIN)) { 466 rc = -EACCES; 467 break; 468 } 469 470 cifs_sb = CIFS_SB(inode->i_sb); 471 tlink = cifs_sb_tlink(cifs_sb); 472 if (IS_ERR(tlink)) { 473 rc = PTR_ERR(tlink); 474 break; 475 } 476 tcon = tlink_tcon(tlink); 477 if (!smb3_encryption_required(tcon)) { 478 rc = -EOPNOTSUPP; 479 cifs_put_tlink(tlink); 480 break; 481 } 482 pkey_inf.cipher_type = 483 le16_to_cpu(tcon->ses->server->cipher_type); 484 pkey_inf.Suid = tcon->ses->Suid; 485 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 486 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); 487 memcpy(pkey_inf.smb3decryptionkey, 488 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); 489 memcpy(pkey_inf.smb3encryptionkey, 490 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); 491 if (copy_to_user((void __user *)arg, &pkey_inf, 492 sizeof(struct smb3_key_debug_info))) 493 rc = -EFAULT; 494 else 495 rc = 0; 496 cifs_put_tlink(tlink); 497 break; 498 case CIFS_DUMP_FULL_KEY: 499 /* 500 * Dump encryption keys (handles any key sizes) 501 */ 502 if (pSMBFile == NULL) 503 break; 504 if (!capable(CAP_SYS_ADMIN)) { 505 rc = -EACCES; 506 break; 507 } 508 cifs_sb = CIFS_SB(inode->i_sb); 509 tlink = cifs_sb_tlink(cifs_sb); 510 if (IS_ERR(tlink)) { 511 rc = PTR_ERR(tlink); 512 break; 513 } 514 515 tcon = tlink_tcon(tlink); 516 rc = cifs_dump_full_key(tcon, (void __user *)arg); 517 cifs_put_tlink(tlink); 518 break; 519 case CIFS_IOC_NOTIFY: 520 if (!S_ISDIR(inode->i_mode)) { 521 /* Notify can only be done on directories */ 522 rc = -EOPNOTSUPP; 523 break; 524 } 525 cifs_sb = CIFS_SB(inode->i_sb); 526 tlink = cifs_sb_tlink(cifs_sb); 527 if (IS_ERR(tlink)) { 528 rc = PTR_ERR(tlink); 529 break; 530 } 531 tcon = tlink_tcon(tlink); 532 if (tcon && tcon->ses->server->ops->notify) { 533 rc = tcon->ses->server->ops->notify(xid, 534 filep, (void __user *)arg, 535 false /* no ret data */); 536 cifs_dbg(FYI, "ioctl notify rc %d\n", rc); 537 } else 538 rc = -EOPNOTSUPP; 539 cifs_put_tlink(tlink); 540 break; 541 case CIFS_IOC_NOTIFY_INFO: 542 if (!S_ISDIR(inode->i_mode)) { 543 /* Notify can only be done on directories */ 544 rc = -EOPNOTSUPP; 545 break; 546 } 547 cifs_sb = CIFS_SB(inode->i_sb); 548 tlink = cifs_sb_tlink(cifs_sb); 549 if (IS_ERR(tlink)) { 550 rc = PTR_ERR(tlink); 551 break; 552 } 553 tcon = tlink_tcon(tlink); 554 if (tcon && tcon->ses->server->ops->notify) { 555 rc = tcon->ses->server->ops->notify(xid, 556 filep, (void __user *)arg, 557 true /* return details */); 558 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc); 559 } else 560 rc = -EOPNOTSUPP; 561 cifs_put_tlink(tlink); 562 break; 563 case CIFS_IOC_SHUTDOWN: 564 rc = cifs_shutdown(inode->i_sb, arg); 565 break; 566 default: 567 cifs_dbg(FYI, "unsupported ioctl\n"); 568 break; 569 } 570 cifs_ioc_exit: 571 free_xid(xid); 572 return rc; 573 } 574