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_fsinfo(unsigned int xid, struct cifs_tcon *tcon, 121 void __user *arg) 122 { 123 int rc = 0; 124 struct smb_mnt_fs_info *fsinf; 125 126 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL); 127 if (fsinf == NULL) 128 return -ENOMEM; 129 130 fsinf->version = 1; 131 fsinf->protocol_id = tcon->ses->server->vals->protocol_id; 132 fsinf->device_characteristics = 133 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics); 134 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType); 135 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes); 136 fsinf->max_path_component = 137 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); 138 fsinf->vol_serial_number = tcon->vol_serial_number; 139 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time); 140 fsinf->share_flags = tcon->share_flags; 141 fsinf->share_caps = le32_to_cpu(tcon->capabilities); 142 fsinf->sector_flags = tcon->ss_flags; 143 fsinf->optimal_sector_size = tcon->perf_sector_size; 144 fsinf->max_bytes_chunk = tcon->max_bytes_chunk; 145 fsinf->maximal_access = tcon->maximal_access; 146 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 147 148 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info))) 149 rc = -EFAULT; 150 151 kfree(fsinf); 152 return rc; 153 } 154 155 static int cifs_shutdown(struct super_block *sb, unsigned long arg) 156 { 157 struct cifs_sb_info *sbi = CIFS_SB(sb); 158 __u32 flags; 159 160 if (!capable(CAP_SYS_ADMIN)) 161 return -EPERM; 162 163 if (get_user(flags, (__u32 __user *)arg)) 164 return -EFAULT; 165 166 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) 167 return -EINVAL; 168 169 if (cifs_forced_shutdown(sbi)) 170 return 0; 171 172 cifs_dbg(VFS, "shut down requested (%d)", flags); 173 /* trace_cifs_shutdown(sb, flags);*/ 174 175 /* 176 * see: 177 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html 178 * for more information and description of original intent of the flags 179 */ 180 switch (flags) { 181 /* 182 * We could add support later for default flag which requires: 183 * "Flush all dirty data and metadata to disk" 184 * would need to call syncfs or equivalent to flush page cache for 185 * the mount and then issue fsync to server (if nostrictsync not set) 186 */ 187 case CIFS_GOING_FLAGS_DEFAULT: 188 cifs_dbg(FYI, "shutdown with default flag not supported\n"); 189 return -EINVAL; 190 /* 191 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not 192 * data) but metadata writes are not cached on the client, so can treat 193 * it similarly to NOLOGFLUSH 194 */ 195 case CIFS_GOING_FLAGS_LOGFLUSH: 196 case CIFS_GOING_FLAGS_NOLOGFLUSH: 197 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; 198 return 0; 199 default: 200 return -EINVAL; 201 } 202 return 0; 203 } 204 205 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) 206 { 207 struct smb3_full_key_debug_info out; 208 struct cifs_ses *ses; 209 int rc = 0; 210 bool found = false; 211 u8 __user *end; 212 213 if (!smb3_encryption_required(tcon)) { 214 rc = -EOPNOTSUPP; 215 goto out; 216 } 217 218 /* copy user input into our output buffer */ 219 if (copy_from_user(&out, in, sizeof(out))) { 220 rc = -EINVAL; 221 goto out; 222 } 223 224 if (!out.session_id) { 225 /* if ses id is 0, use current user session */ 226 ses = tcon->ses; 227 } else { 228 /* otherwise if a session id is given, look for it in all our sessions */ 229 struct cifs_ses *ses_it = NULL; 230 struct TCP_Server_Info *server_it = NULL; 231 232 spin_lock(&cifs_tcp_ses_lock); 233 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { 234 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { 235 if (ses_it->Suid == out.session_id) { 236 ses = ses_it; 237 /* 238 * since we are using the session outside the crit 239 * section, we need to make sure it won't be released 240 * so increment its refcount 241 */ 242 cifs_smb_ses_inc_refcount(ses); 243 found = true; 244 goto search_end; 245 } 246 } 247 } 248 search_end: 249 spin_unlock(&cifs_tcp_ses_lock); 250 if (!found) { 251 rc = -ENOENT; 252 goto out; 253 } 254 } 255 256 switch (ses->server->cipher_type) { 257 case SMB2_ENCRYPTION_AES128_CCM: 258 case SMB2_ENCRYPTION_AES128_GCM: 259 out.session_key_length = CIFS_SESS_KEY_SIZE; 260 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; 261 break; 262 case SMB2_ENCRYPTION_AES256_CCM: 263 case SMB2_ENCRYPTION_AES256_GCM: 264 out.session_key_length = CIFS_SESS_KEY_SIZE; 265 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; 266 break; 267 default: 268 rc = -EOPNOTSUPP; 269 goto out; 270 } 271 272 /* check if user buffer is big enough to store all the keys */ 273 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length 274 + out.server_out_key_length) { 275 rc = -ENOBUFS; 276 goto out; 277 } 278 279 out.session_id = ses->Suid; 280 out.cipher_type = le16_to_cpu(ses->server->cipher_type); 281 282 /* overwrite user input with our output */ 283 if (copy_to_user(in, &out, sizeof(out))) { 284 rc = -EINVAL; 285 goto out; 286 } 287 288 /* append all the keys at the end of the user buffer */ 289 end = in->data; 290 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { 291 rc = -EINVAL; 292 goto out; 293 } 294 end += out.session_key_length; 295 296 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { 297 rc = -EINVAL; 298 goto out; 299 } 300 end += out.server_in_key_length; 301 302 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { 303 rc = -EINVAL; 304 goto out; 305 } 306 307 out: 308 if (found) 309 cifs_put_smb_ses(ses); 310 return rc; 311 } 312 313 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) 314 { 315 struct inode *inode = file_inode(filep); 316 struct smb3_key_debug_info pkey_inf; 317 int rc = -ENOTTY; /* strange error - but the precedent */ 318 unsigned int xid; 319 struct cifsFileInfo *pSMBFile = filep->private_data; 320 struct cifs_tcon *tcon; 321 struct tcon_link *tlink; 322 struct cifs_sb_info *cifs_sb; 323 __u64 ExtAttrBits = 0; 324 #ifdef CONFIG_CIFS_POSIX 325 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 326 __u64 caps; 327 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 328 #endif /* CONFIG_CIFS_POSIX */ 329 330 xid = get_xid(); 331 332 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); 333 switch (command) { 334 case FS_IOC_GETFLAGS: 335 if (pSMBFile == NULL) 336 break; 337 tcon = tlink_tcon(pSMBFile->tlink); 338 #ifdef CONFIG_CIFS_POSIX 339 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 340 caps = le64_to_cpu(tcon->fsUnixInfo.Capability); 341 if (CIFS_UNIX_EXTATTR_CAP & caps) { 342 __u64 ExtAttrMask = 0; 343 rc = CIFSGetExtAttr(xid, tcon, 344 pSMBFile->fid.netfid, 345 &ExtAttrBits, &ExtAttrMask); 346 if (rc == 0) 347 rc = put_user(ExtAttrBits & 348 FS_FL_USER_VISIBLE, 349 (int __user *)arg); 350 if (rc != -EOPNOTSUPP) 351 break; 352 } 353 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 354 #endif /* CONFIG_CIFS_POSIX */ 355 rc = 0; 356 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { 357 /* add in the compressed bit */ 358 ExtAttrBits = FS_COMPR_FL; 359 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, 360 (int __user *)arg); 361 } 362 break; 363 case FS_IOC_SETFLAGS: 364 if (pSMBFile == NULL) 365 break; 366 tcon = tlink_tcon(pSMBFile->tlink); 367 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ 368 369 if (get_user(ExtAttrBits, (int __user *)arg)) { 370 rc = -EFAULT; 371 break; 372 } 373 374 /* 375 * if (CIFS_UNIX_EXTATTR_CAP & caps) 376 * rc = CIFSSetExtAttr(xid, tcon, 377 * pSMBFile->fid.netfid, 378 * extAttrBits, 379 * &ExtAttrMask); 380 * if (rc != -EOPNOTSUPP) 381 * break; 382 */ 383 384 /* Currently only flag we can set is compressed flag */ 385 if ((ExtAttrBits & FS_COMPR_FL) == 0) 386 break; 387 388 /* Try to set compress flag */ 389 if (tcon->ses->server->ops->set_compression) { 390 rc = tcon->ses->server->ops->set_compression( 391 xid, tcon, pSMBFile); 392 cifs_dbg(FYI, "set compress flag rc %d\n", rc); 393 } 394 break; 395 case CIFS_IOC_COPYCHUNK_FILE: 396 rc = cifs_ioctl_copychunk(xid, filep, arg); 397 break; 398 case CIFS_QUERY_INFO: 399 rc = cifs_ioctl_query_info(xid, filep, arg); 400 break; 401 case CIFS_IOC_SET_INTEGRITY: 402 if (pSMBFile == NULL) 403 break; 404 tcon = tlink_tcon(pSMBFile->tlink); 405 if (tcon->ses->server->ops->set_integrity) 406 rc = tcon->ses->server->ops->set_integrity(xid, 407 tcon, pSMBFile); 408 else 409 rc = -EOPNOTSUPP; 410 break; 411 case CIFS_IOC_GET_MNT_INFO: 412 if (pSMBFile == NULL) 413 break; 414 tcon = tlink_tcon(pSMBFile->tlink); 415 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); 416 break; 417 case CIFS_ENUMERATE_SNAPSHOTS: 418 if (pSMBFile == NULL) 419 break; 420 if (arg == 0) { 421 rc = -EINVAL; 422 goto cifs_ioc_exit; 423 } 424 tcon = tlink_tcon(pSMBFile->tlink); 425 if (tcon->ses->server->ops->enum_snapshots) 426 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, 427 pSMBFile, (void __user *)arg); 428 else 429 rc = -EOPNOTSUPP; 430 break; 431 case CIFS_DUMP_KEY: 432 /* 433 * Dump encryption keys. This is an old ioctl that only 434 * handles AES-128-{CCM,GCM}. 435 */ 436 if (pSMBFile == NULL) 437 break; 438 if (!capable(CAP_SYS_ADMIN)) { 439 rc = -EACCES; 440 break; 441 } 442 443 tcon = tlink_tcon(pSMBFile->tlink); 444 if (!smb3_encryption_required(tcon)) { 445 rc = -EOPNOTSUPP; 446 break; 447 } 448 pkey_inf.cipher_type = 449 le16_to_cpu(tcon->ses->server->cipher_type); 450 pkey_inf.Suid = tcon->ses->Suid; 451 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 452 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); 453 memcpy(pkey_inf.smb3decryptionkey, 454 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); 455 memcpy(pkey_inf.smb3encryptionkey, 456 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); 457 if (copy_to_user((void __user *)arg, &pkey_inf, 458 sizeof(struct smb3_key_debug_info))) 459 rc = -EFAULT; 460 else 461 rc = 0; 462 break; 463 case CIFS_DUMP_FULL_KEY: 464 /* 465 * Dump encryption keys (handles any key sizes) 466 */ 467 if (pSMBFile == NULL) 468 break; 469 if (!capable(CAP_SYS_ADMIN)) { 470 rc = -EACCES; 471 break; 472 } 473 tcon = tlink_tcon(pSMBFile->tlink); 474 rc = cifs_dump_full_key(tcon, (void __user *)arg); 475 break; 476 case CIFS_IOC_NOTIFY: 477 if (!S_ISDIR(inode->i_mode)) { 478 /* Notify can only be done on directories */ 479 rc = -EOPNOTSUPP; 480 break; 481 } 482 cifs_sb = CIFS_SB(inode->i_sb); 483 tlink = cifs_sb_tlink(cifs_sb); 484 if (IS_ERR(tlink)) { 485 rc = PTR_ERR(tlink); 486 break; 487 } 488 tcon = tlink_tcon(tlink); 489 if (tcon && tcon->ses->server->ops->notify) { 490 rc = tcon->ses->server->ops->notify(xid, 491 filep, (void __user *)arg, 492 false /* no ret data */); 493 cifs_dbg(FYI, "ioctl notify rc %d\n", rc); 494 } else 495 rc = -EOPNOTSUPP; 496 cifs_put_tlink(tlink); 497 break; 498 case CIFS_IOC_NOTIFY_INFO: 499 if (!S_ISDIR(inode->i_mode)) { 500 /* Notify can only be done on directories */ 501 rc = -EOPNOTSUPP; 502 break; 503 } 504 cifs_sb = CIFS_SB(inode->i_sb); 505 tlink = cifs_sb_tlink(cifs_sb); 506 if (IS_ERR(tlink)) { 507 rc = PTR_ERR(tlink); 508 break; 509 } 510 tcon = tlink_tcon(tlink); 511 if (tcon && tcon->ses->server->ops->notify) { 512 rc = tcon->ses->server->ops->notify(xid, 513 filep, (void __user *)arg, 514 true /* return details */); 515 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc); 516 } else 517 rc = -EOPNOTSUPP; 518 cifs_put_tlink(tlink); 519 break; 520 case CIFS_IOC_SHUTDOWN: 521 rc = cifs_shutdown(inode->i_sb, arg); 522 break; 523 default: 524 cifs_dbg(FYI, "unsupported ioctl\n"); 525 break; 526 } 527 cifs_ioc_exit: 528 free_xid(xid); 529 return rc; 530 } 531