1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2002,2011 5 * Etersoft, 2012 6 * Author(s): Steve French (sfrench@us.ibm.com) 7 * Pavel Shilovsky (pshilovsky@samba.org) 2012 8 * 9 */ 10 #include <linux/ctype.h> 11 #include "cifsglob.h" 12 #include "cifsproto.h" 13 #include "smb2proto.h" 14 #include "cifs_debug.h" 15 #include "cifs_unicode.h" 16 #include "smb2status.h" 17 #include "smb2glob.h" 18 #include "nterr.h" 19 #include "cached_dir.h" 20 21 static int 22 check_smb2_hdr(struct smb2_hdr *shdr, __u64 mid) 23 { 24 __u64 wire_mid = le64_to_cpu(shdr->MessageId); 25 26 /* 27 * Make sure that this really is an SMB, that it is a response, 28 * and that the message ids match. 29 */ 30 if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) && 31 (mid == wire_mid)) { 32 if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) 33 return 0; 34 else { 35 /* only one valid case where server sends us request */ 36 if (shdr->Command == SMB2_OPLOCK_BREAK) 37 return 0; 38 else 39 cifs_dbg(VFS, "Received Request not response\n"); 40 } 41 } else { /* bad signature or mid */ 42 if (shdr->ProtocolId != SMB2_PROTO_NUMBER) 43 cifs_dbg(VFS, "Bad protocol string signature header %x\n", 44 le32_to_cpu(shdr->ProtocolId)); 45 if (mid != wire_mid) 46 cifs_dbg(VFS, "Mids do not match: %llu and %llu\n", 47 mid, wire_mid); 48 } 49 cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid); 50 return 1; 51 } 52 53 /* 54 * The following table defines the expected "StructureSize" of SMB2 responses 55 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses. 56 * 57 * Note that commands are defined in smb2pdu.h in le16 but the array below is 58 * indexed by command in host byte order 59 */ 60 static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { 61 /* SMB2_NEGOTIATE */ cpu_to_le16(65), 62 /* SMB2_SESSION_SETUP */ cpu_to_le16(9), 63 /* SMB2_LOGOFF */ cpu_to_le16(4), 64 /* SMB2_TREE_CONNECT */ cpu_to_le16(16), 65 /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4), 66 /* SMB2_CREATE */ cpu_to_le16(89), 67 /* SMB2_CLOSE */ cpu_to_le16(60), 68 /* SMB2_FLUSH */ cpu_to_le16(4), 69 /* SMB2_READ */ cpu_to_le16(17), 70 /* SMB2_WRITE */ cpu_to_le16(17), 71 /* SMB2_LOCK */ cpu_to_le16(4), 72 /* SMB2_IOCTL */ cpu_to_le16(49), 73 /* BB CHECK this ... not listed in documentation */ 74 /* SMB2_CANCEL */ cpu_to_le16(0), 75 /* SMB2_ECHO */ cpu_to_le16(4), 76 /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9), 77 /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9), 78 /* SMB2_QUERY_INFO */ cpu_to_le16(9), 79 /* SMB2_SET_INFO */ cpu_to_le16(2), 80 /* BB FIXME can also be 44 for lease break */ 81 /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24) 82 }; 83 84 #define SMB311_NEGPROT_BASE_SIZE (sizeof(struct smb2_hdr) + sizeof(struct smb2_negotiate_rsp)) 85 86 static __u32 get_neg_ctxt_len(struct smb2_hdr *hdr, __u32 len, 87 __u32 non_ctxlen) 88 { 89 __u16 neg_count; 90 __u32 nc_offset, size_of_pad_before_neg_ctxts; 91 struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr; 92 93 /* Negotiate contexts are only valid for latest dialect SMB3.11 */ 94 neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount); 95 if ((neg_count == 0) || 96 (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID))) 97 return 0; 98 99 /* 100 * if SPNEGO blob present (ie the RFC2478 GSS info which indicates 101 * which security mechanisms the server supports) make sure that 102 * the negotiate contexts start after it 103 */ 104 nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset); 105 /* 106 * non_ctxlen is at least shdr->StructureSize + pdu->StructureSize2 107 * and the latter is 1 byte bigger than the fix-sized area of the 108 * NEGOTIATE response 109 */ 110 if (nc_offset + 1 < non_ctxlen) { 111 pr_warn_once("Invalid negotiate context offset %d\n", nc_offset); 112 return 0; 113 } else if (nc_offset + 1 == non_ctxlen) { 114 cifs_dbg(FYI, "no SPNEGO security blob in negprot rsp\n"); 115 size_of_pad_before_neg_ctxts = 0; 116 } else if (non_ctxlen == SMB311_NEGPROT_BASE_SIZE + 1) 117 /* has padding, but no SPNEGO blob */ 118 size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen + 1; 119 else 120 size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen; 121 122 /* Verify that at least minimal negotiate contexts fit within frame */ 123 if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) { 124 pr_warn_once("negotiate context goes beyond end\n"); 125 return 0; 126 } 127 128 cifs_dbg(FYI, "length of negcontexts %d pad %d\n", 129 len - nc_offset, size_of_pad_before_neg_ctxts); 130 131 /* length of negcontexts including pad from end of sec blob to them */ 132 return (len - nc_offset) + size_of_pad_before_neg_ctxts; 133 } 134 135 int 136 smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *server) 137 { 138 struct TCP_Server_Info *pserver; 139 struct smb2_hdr *shdr = (struct smb2_hdr *)buf; 140 struct smb2_pdu *pdu = (struct smb2_pdu *)shdr; 141 int hdr_size = sizeof(struct smb2_hdr); 142 int pdu_size = sizeof(struct smb2_pdu); 143 int command; 144 __u32 calc_len; /* calculated length */ 145 __u64 mid; 146 147 /* If server is a channel, select the primary channel */ 148 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server; 149 150 /* 151 * Add function to do table lookup of StructureSize by command 152 * ie Validate the wct via smb2_struct_sizes table above 153 */ 154 if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) { 155 struct smb2_transform_hdr *thdr = 156 (struct smb2_transform_hdr *)buf; 157 struct cifs_ses *ses = NULL; 158 struct cifs_ses *iter; 159 160 /* decrypt frame now that it is completely read in */ 161 spin_lock(&cifs_tcp_ses_lock); 162 list_for_each_entry(iter, &pserver->smb_ses_list, smb_ses_list) { 163 if (iter->Suid == le64_to_cpu(thdr->SessionId)) { 164 ses = iter; 165 break; 166 } 167 } 168 spin_unlock(&cifs_tcp_ses_lock); 169 if (!ses) { 170 cifs_dbg(VFS, "no decryption - session id not found\n"); 171 return 1; 172 } 173 } 174 175 mid = le64_to_cpu(shdr->MessageId); 176 if (len < pdu_size) { 177 if ((len >= hdr_size) 178 && (shdr->Status != 0)) { 179 pdu->StructureSize2 = 0; 180 /* 181 * As with SMB/CIFS, on some error cases servers may 182 * not return wct properly 183 */ 184 return 0; 185 } else { 186 cifs_dbg(VFS, "Length less than SMB header size\n"); 187 } 188 return 1; 189 } 190 if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) { 191 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n", 192 mid); 193 return 1; 194 } 195 196 if (check_smb2_hdr(shdr, mid)) 197 return 1; 198 199 if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) { 200 cifs_dbg(VFS, "Invalid structure size %u\n", 201 le16_to_cpu(shdr->StructureSize)); 202 return 1; 203 } 204 205 command = le16_to_cpu(shdr->Command); 206 if (command >= NUMBER_OF_SMB2_COMMANDS) { 207 cifs_dbg(VFS, "Invalid SMB2 command %d\n", command); 208 return 1; 209 } 210 211 if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) { 212 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 || 213 pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2_LE)) { 214 /* error packets have 9 byte structure size */ 215 cifs_dbg(VFS, "Invalid response size %u for command %d\n", 216 le16_to_cpu(pdu->StructureSize2), command); 217 return 1; 218 } else if (command == SMB2_OPLOCK_BREAK_HE 219 && (shdr->Status == 0) 220 && (le16_to_cpu(pdu->StructureSize2) != 44) 221 && (le16_to_cpu(pdu->StructureSize2) != 36)) { 222 /* special case for SMB2.1 lease break message */ 223 cifs_dbg(VFS, "Invalid response size %d for oplock break\n", 224 le16_to_cpu(pdu->StructureSize2)); 225 return 1; 226 } 227 } 228 229 calc_len = smb2_calc_size(buf); 230 231 /* For SMB2_IOCTL, OutputOffset and OutputLength are optional, so might 232 * be 0, and not a real miscalculation */ 233 if (command == SMB2_IOCTL_HE && calc_len == 0) 234 return 0; 235 236 if (command == SMB2_NEGOTIATE_HE) 237 calc_len += get_neg_ctxt_len(shdr, len, calc_len); 238 239 if (len != calc_len) { 240 /* create failed on symlink */ 241 if (command == SMB2_CREATE_HE && 242 shdr->Status == STATUS_STOPPED_ON_SYMLINK) 243 return 0; 244 /* Windows 7 server returns 24 bytes more */ 245 if (calc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE) 246 return 0; 247 /* server can return one byte more due to implied bcc[0] */ 248 if (calc_len == len + 1) 249 return 0; 250 251 /* 252 * Some windows servers (win2016) will pad also the final 253 * PDU in a compound to 8 bytes. 254 */ 255 if (ALIGN(calc_len, 8) == len) 256 return 0; 257 258 /* 259 * MacOS server pads after SMB2.1 write response with 3 bytes 260 * of junk. Other servers match RFC1001 len to actual 261 * SMB2/SMB3 frame length (header + smb2 response specific data) 262 * Some windows servers also pad up to 8 bytes when compounding. 263 */ 264 if (calc_len < len) 265 return 0; 266 267 /* Only log a message if len was really miscalculated */ 268 if (unlikely(cifsFYI)) 269 cifs_dbg(FYI, "Server response too short: calculated " 270 "length %u doesn't match read length %u (cmd=%d, mid=%llu)\n", 271 calc_len, len, command, mid); 272 else 273 pr_warn("Server response too short: calculated length " 274 "%u doesn't match read length %u (cmd=%d, mid=%llu)\n", 275 calc_len, len, command, mid); 276 277 return 1; 278 } 279 return 0; 280 } 281 282 /* 283 * The size of the variable area depends on the offset and length fields 284 * located in different fields for various SMB2 responses. SMB2 responses 285 * with no variable length info, show an offset of zero for the offset field. 286 */ 287 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = { 288 /* SMB2_NEGOTIATE */ true, 289 /* SMB2_SESSION_SETUP */ true, 290 /* SMB2_LOGOFF */ false, 291 /* SMB2_TREE_CONNECT */ false, 292 /* SMB2_TREE_DISCONNECT */ false, 293 /* SMB2_CREATE */ true, 294 /* SMB2_CLOSE */ false, 295 /* SMB2_FLUSH */ false, 296 /* SMB2_READ */ true, 297 /* SMB2_WRITE */ false, 298 /* SMB2_LOCK */ false, 299 /* SMB2_IOCTL */ true, 300 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */ 301 /* SMB2_ECHO */ false, 302 /* SMB2_QUERY_DIRECTORY */ true, 303 /* SMB2_CHANGE_NOTIFY */ true, 304 /* SMB2_QUERY_INFO */ true, 305 /* SMB2_SET_INFO */ false, 306 /* SMB2_OPLOCK_BREAK */ false 307 }; 308 309 /* 310 * Returns the pointer to the beginning of the data area. Length of the data 311 * area and the offset to it (from the beginning of the smb are also returned. 312 */ 313 char * 314 smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *shdr) 315 { 316 *off = 0; 317 *len = 0; 318 319 /* error responses do not have data area */ 320 if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED && 321 (((struct smb2_err_rsp *)shdr)->StructureSize) == 322 SMB2_ERROR_STRUCTURE_SIZE2_LE) 323 return NULL; 324 325 /* 326 * Following commands have data areas so we have to get the location 327 * of the data buffer offset and data buffer length for the particular 328 * command. 329 */ 330 switch (shdr->Command) { 331 case SMB2_NEGOTIATE: 332 *off = le16_to_cpu( 333 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset); 334 *len = le16_to_cpu( 335 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength); 336 break; 337 case SMB2_SESSION_SETUP: 338 *off = le16_to_cpu( 339 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset); 340 *len = le16_to_cpu( 341 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength); 342 break; 343 case SMB2_CREATE: 344 *off = le32_to_cpu( 345 ((struct smb2_create_rsp *)shdr)->CreateContextsOffset); 346 *len = le32_to_cpu( 347 ((struct smb2_create_rsp *)shdr)->CreateContextsLength); 348 break; 349 case SMB2_QUERY_INFO: 350 *off = le16_to_cpu( 351 ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset); 352 *len = le32_to_cpu( 353 ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength); 354 break; 355 case SMB2_READ: 356 /* TODO: is this a bug ? */ 357 *off = ((struct smb2_read_rsp *)shdr)->DataOffset; 358 *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength); 359 break; 360 case SMB2_QUERY_DIRECTORY: 361 *off = le16_to_cpu( 362 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset); 363 *len = le32_to_cpu( 364 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength); 365 break; 366 case SMB2_IOCTL: 367 *off = le32_to_cpu( 368 ((struct smb2_ioctl_rsp *)shdr)->OutputOffset); 369 *len = le32_to_cpu( 370 ((struct smb2_ioctl_rsp *)shdr)->OutputCount); 371 break; 372 case SMB2_CHANGE_NOTIFY: 373 *off = le16_to_cpu( 374 ((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset); 375 *len = le32_to_cpu( 376 ((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength); 377 break; 378 default: 379 cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command)); 380 break; 381 } 382 383 /* 384 * Invalid length or offset probably means data area is invalid, but 385 * we have little choice but to ignore the data area in this case. 386 */ 387 if (*off > 4096) { 388 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off); 389 *len = 0; 390 *off = 0; 391 } else if (*off < 0) { 392 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n", 393 *off); 394 *off = 0; 395 *len = 0; 396 } else if (*len < 0) { 397 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n", 398 *len); 399 *len = 0; 400 } else if (*len > 128 * 1024) { 401 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len); 402 *len = 0; 403 } 404 405 /* return pointer to beginning of data area, ie offset from SMB start */ 406 if ((*off != 0) && (*len != 0)) 407 return (char *)shdr + *off; 408 else 409 return NULL; 410 } 411 412 /* 413 * Calculate the size of the SMB message based on the fixed header 414 * portion, the number of word parameters and the data portion of the message. 415 */ 416 unsigned int 417 smb2_calc_size(void *buf) 418 { 419 struct smb2_pdu *pdu = buf; 420 struct smb2_hdr *shdr = &pdu->hdr; 421 int offset; /* the offset from the beginning of SMB to data area */ 422 int data_length; /* the length of the variable length data area */ 423 /* Structure Size has already been checked to make sure it is 64 */ 424 int len = le16_to_cpu(shdr->StructureSize); 425 426 /* 427 * StructureSize2, ie length of fixed parameter area has already 428 * been checked to make sure it is the correct length. 429 */ 430 len += le16_to_cpu(pdu->StructureSize2); 431 432 if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false) 433 goto calc_size_exit; 434 435 smb2_get_data_area_len(&offset, &data_length, shdr); 436 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset); 437 438 if (data_length > 0) { 439 /* 440 * Check to make sure that data area begins after fixed area, 441 * Note that last byte of the fixed area is part of data area 442 * for some commands, typically those with odd StructureSize, 443 * so we must add one to the calculation. 444 */ 445 if (offset + 1 < len) { 446 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n", 447 offset + 1, len); 448 data_length = 0; 449 } else { 450 len = offset + data_length; 451 } 452 } 453 calc_size_exit: 454 cifs_dbg(FYI, "SMB2 len %d\n", len); 455 return len; 456 } 457 458 /* Note: caller must free return buffer */ 459 __le16 * 460 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb) 461 { 462 int len; 463 const char *start_of_path; 464 __le16 *to; 465 int map_type; 466 467 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) 468 map_type = SFM_MAP_UNI_RSVD; 469 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) 470 map_type = SFU_MAP_UNI_RSVD; 471 else 472 map_type = NO_MAP_UNI_RSVD; 473 474 /* Windows doesn't allow paths beginning with \ */ 475 if (from[0] == '\\') 476 start_of_path = from + 1; 477 478 /* SMB311 POSIX extensions paths do not include leading slash */ 479 else if (cifs_sb_master_tlink(cifs_sb) && 480 cifs_sb_master_tcon(cifs_sb)->posix_extensions && 481 (from[0] == '/')) { 482 start_of_path = from + 1; 483 } else 484 start_of_path = from; 485 486 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len, 487 cifs_sb->local_nls, map_type); 488 return to; 489 } 490 491 __le32 492 smb2_get_lease_state(struct cifsInodeInfo *cinode) 493 { 494 __le32 lease = 0; 495 496 if (CIFS_CACHE_WRITE(cinode)) 497 lease |= SMB2_LEASE_WRITE_CACHING_LE; 498 if (CIFS_CACHE_HANDLE(cinode)) 499 lease |= SMB2_LEASE_HANDLE_CACHING_LE; 500 if (CIFS_CACHE_READ(cinode)) 501 lease |= SMB2_LEASE_READ_CACHING_LE; 502 return lease; 503 } 504 505 struct smb2_lease_break_work { 506 struct work_struct lease_break; 507 struct tcon_link *tlink; 508 __u8 lease_key[16]; 509 __le32 lease_state; 510 }; 511 512 static void 513 cifs_ses_oplock_break(struct work_struct *work) 514 { 515 struct smb2_lease_break_work *lw = container_of(work, 516 struct smb2_lease_break_work, lease_break); 517 int rc = 0; 518 519 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key, 520 lw->lease_state); 521 522 cifs_dbg(FYI, "Lease release rc %d\n", rc); 523 cifs_put_tlink(lw->tlink); 524 kfree(lw); 525 } 526 527 static void 528 smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key, 529 __le32 new_lease_state) 530 { 531 struct smb2_lease_break_work *lw; 532 533 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL); 534 if (!lw) { 535 cifs_put_tlink(tlink); 536 return; 537 } 538 539 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break); 540 lw->tlink = tlink; 541 lw->lease_state = new_lease_state; 542 memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE); 543 queue_work(cifsiod_wq, &lw->lease_break); 544 } 545 546 static bool 547 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp) 548 { 549 __u8 lease_state; 550 struct cifsFileInfo *cfile; 551 struct cifsInodeInfo *cinode; 552 int ack_req = le32_to_cpu(rsp->Flags & 553 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); 554 555 lease_state = le32_to_cpu(rsp->NewLeaseState); 556 557 list_for_each_entry(cfile, &tcon->openFileList, tlist) { 558 cinode = CIFS_I(d_inode(cfile->dentry)); 559 560 if (memcmp(cinode->lease_key, rsp->LeaseKey, 561 SMB2_LEASE_KEY_SIZE)) 562 continue; 563 564 cifs_dbg(FYI, "found in the open list\n"); 565 cifs_dbg(FYI, "lease key match, lease break 0x%x\n", 566 lease_state); 567 568 if (ack_req) 569 cfile->oplock_break_cancelled = false; 570 else 571 cfile->oplock_break_cancelled = true; 572 573 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); 574 575 cfile->oplock_epoch = le16_to_cpu(rsp->Epoch); 576 cfile->oplock_level = lease_state; 577 578 cifs_queue_oplock_break(cfile); 579 return true; 580 } 581 582 return false; 583 } 584 585 static struct cifs_pending_open * 586 smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon, 587 struct smb2_lease_break *rsp) 588 { 589 __u8 lease_state = le32_to_cpu(rsp->NewLeaseState); 590 int ack_req = le32_to_cpu(rsp->Flags & 591 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); 592 struct cifs_pending_open *open; 593 struct cifs_pending_open *found = NULL; 594 595 list_for_each_entry(open, &tcon->pending_opens, olist) { 596 if (memcmp(open->lease_key, rsp->LeaseKey, 597 SMB2_LEASE_KEY_SIZE)) 598 continue; 599 600 if (!found && ack_req) { 601 found = open; 602 } 603 604 cifs_dbg(FYI, "found in the pending open list\n"); 605 cifs_dbg(FYI, "lease key match, lease break 0x%x\n", 606 lease_state); 607 608 open->oplock = lease_state; 609 } 610 611 return found; 612 } 613 614 static bool 615 smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server) 616 { 617 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer; 618 struct TCP_Server_Info *pserver; 619 struct cifs_ses *ses; 620 struct cifs_tcon *tcon; 621 struct cifs_pending_open *open; 622 623 cifs_dbg(FYI, "Checking for lease break\n"); 624 625 /* If server is a channel, select the primary channel */ 626 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server; 627 628 /* look up tcon based on tid & uid */ 629 spin_lock(&cifs_tcp_ses_lock); 630 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 631 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 632 spin_lock(&tcon->open_file_lock); 633 cifs_stats_inc( 634 &tcon->stats.cifs_stats.num_oplock_brks); 635 if (smb2_tcon_has_lease(tcon, rsp)) { 636 spin_unlock(&tcon->open_file_lock); 637 spin_unlock(&cifs_tcp_ses_lock); 638 return true; 639 } 640 open = smb2_tcon_find_pending_open_lease(tcon, 641 rsp); 642 if (open) { 643 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; 644 struct tcon_link *tlink; 645 646 tlink = cifs_get_tlink(open->tlink); 647 memcpy(lease_key, open->lease_key, 648 SMB2_LEASE_KEY_SIZE); 649 spin_unlock(&tcon->open_file_lock); 650 spin_unlock(&cifs_tcp_ses_lock); 651 smb2_queue_pending_open_break(tlink, 652 lease_key, 653 rsp->NewLeaseState); 654 return true; 655 } 656 spin_unlock(&tcon->open_file_lock); 657 658 if (cached_dir_lease_break(tcon, rsp->LeaseKey)) { 659 spin_unlock(&cifs_tcp_ses_lock); 660 return true; 661 } 662 } 663 } 664 spin_unlock(&cifs_tcp_ses_lock); 665 cifs_dbg(FYI, "Can not process lease break - no lease matched\n"); 666 trace_smb3_lease_not_found(le32_to_cpu(rsp->CurrentLeaseState), 667 le32_to_cpu(rsp->hdr.Id.SyncId.TreeId), 668 le64_to_cpu(rsp->hdr.SessionId), 669 *((u64 *)rsp->LeaseKey), 670 *((u64 *)&rsp->LeaseKey[8])); 671 672 return false; 673 } 674 675 bool 676 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server) 677 { 678 struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer; 679 struct TCP_Server_Info *pserver; 680 struct cifs_ses *ses; 681 struct cifs_tcon *tcon; 682 struct cifsInodeInfo *cinode; 683 struct cifsFileInfo *cfile; 684 685 cifs_dbg(FYI, "Checking for oplock break\n"); 686 687 if (rsp->hdr.Command != SMB2_OPLOCK_BREAK) 688 return false; 689 690 if (rsp->StructureSize != 691 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) { 692 if (le16_to_cpu(rsp->StructureSize) == 44) 693 return smb2_is_valid_lease_break(buffer, server); 694 else 695 return false; 696 } 697 698 cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel); 699 700 /* If server is a channel, select the primary channel */ 701 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server; 702 703 /* look up tcon based on tid & uid */ 704 spin_lock(&cifs_tcp_ses_lock); 705 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 706 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 707 708 spin_lock(&tcon->open_file_lock); 709 list_for_each_entry(cfile, &tcon->openFileList, tlist) { 710 if (rsp->PersistentFid != 711 cfile->fid.persistent_fid || 712 rsp->VolatileFid != 713 cfile->fid.volatile_fid) 714 continue; 715 716 cifs_dbg(FYI, "file id match, oplock break\n"); 717 cifs_stats_inc( 718 &tcon->stats.cifs_stats.num_oplock_brks); 719 cinode = CIFS_I(d_inode(cfile->dentry)); 720 spin_lock(&cfile->file_info_lock); 721 if (!CIFS_CACHE_WRITE(cinode) && 722 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE) 723 cfile->oplock_break_cancelled = true; 724 else 725 cfile->oplock_break_cancelled = false; 726 727 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, 728 &cinode->flags); 729 730 cfile->oplock_epoch = 0; 731 cfile->oplock_level = rsp->OplockLevel; 732 733 spin_unlock(&cfile->file_info_lock); 734 735 cifs_queue_oplock_break(cfile); 736 737 spin_unlock(&tcon->open_file_lock); 738 spin_unlock(&cifs_tcp_ses_lock); 739 return true; 740 } 741 spin_unlock(&tcon->open_file_lock); 742 } 743 } 744 spin_unlock(&cifs_tcp_ses_lock); 745 cifs_dbg(FYI, "No file id matched, oplock break ignored\n"); 746 trace_smb3_oplock_not_found(0 /* no xid */, rsp->PersistentFid, 747 le32_to_cpu(rsp->hdr.Id.SyncId.TreeId), 748 le64_to_cpu(rsp->hdr.SessionId)); 749 750 return true; 751 } 752 753 void 754 smb2_cancelled_close_fid(struct work_struct *work) 755 { 756 struct close_cancelled_open *cancelled = container_of(work, 757 struct close_cancelled_open, work); 758 struct cifs_tcon *tcon = cancelled->tcon; 759 int rc; 760 761 if (cancelled->mid) 762 cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llu\n", 763 cancelled->mid); 764 else 765 cifs_tcon_dbg(VFS, "Close interrupted close\n"); 766 767 rc = SMB2_close(0, tcon, cancelled->fid.persistent_fid, 768 cancelled->fid.volatile_fid); 769 if (rc) 770 cifs_tcon_dbg(VFS, "Close cancelled mid failed rc:%d\n", rc); 771 772 cifs_put_tcon(tcon); 773 kfree(cancelled); 774 } 775 776 /* 777 * Caller should already has an extra reference to @tcon 778 * This function is used to queue work to close a handle to prevent leaks 779 * on the server. 780 * We handle two cases. If an open was interrupted after we sent the 781 * SMB2_CREATE to the server but before we processed the reply, and second 782 * if a close was interrupted before we sent the SMB2_CLOSE to the server. 783 */ 784 static int 785 __smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid, 786 __u64 persistent_fid, __u64 volatile_fid) 787 { 788 struct close_cancelled_open *cancelled; 789 790 cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC); 791 if (!cancelled) 792 return -ENOMEM; 793 794 cancelled->fid.persistent_fid = persistent_fid; 795 cancelled->fid.volatile_fid = volatile_fid; 796 cancelled->tcon = tcon; 797 cancelled->cmd = cmd; 798 cancelled->mid = mid; 799 INIT_WORK(&cancelled->work, smb2_cancelled_close_fid); 800 WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false); 801 802 return 0; 803 } 804 805 int 806 smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid, 807 __u64 volatile_fid) 808 { 809 int rc; 810 811 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count); 812 spin_lock(&cifs_tcp_ses_lock); 813 if (tcon->tc_count <= 0) { 814 struct TCP_Server_Info *server = NULL; 815 816 WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative"); 817 spin_unlock(&cifs_tcp_ses_lock); 818 819 if (tcon->ses) 820 server = tcon->ses->server; 821 822 cifs_server_dbg(FYI, "tid=0x%x: tcon is closing, skipping async close retry of fid %llu %llu\n", 823 tcon->tid, persistent_fid, volatile_fid); 824 825 return 0; 826 } 827 tcon->tc_count++; 828 spin_unlock(&cifs_tcp_ses_lock); 829 830 rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0, 831 persistent_fid, volatile_fid); 832 if (rc) 833 cifs_put_tcon(tcon); 834 835 return rc; 836 } 837 838 int 839 smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server) 840 { 841 struct smb2_hdr *hdr = mid->resp_buf; 842 struct smb2_create_rsp *rsp = mid->resp_buf; 843 struct cifs_tcon *tcon; 844 int rc; 845 846 if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || hdr->Command != SMB2_CREATE || 847 hdr->Status != STATUS_SUCCESS) 848 return 0; 849 850 tcon = smb2_find_smb_tcon(server, le64_to_cpu(hdr->SessionId), 851 le32_to_cpu(hdr->Id.SyncId.TreeId)); 852 if (!tcon) 853 return -ENOENT; 854 855 rc = __smb2_handle_cancelled_cmd(tcon, 856 le16_to_cpu(hdr->Command), 857 le64_to_cpu(hdr->MessageId), 858 rsp->PersistentFileId, 859 rsp->VolatileFileId); 860 if (rc) 861 cifs_put_tcon(tcon); 862 863 return rc; 864 } 865 866 /** 867 * smb311_update_preauth_hash - update @ses hash with the packet data in @iov 868 * 869 * Assumes @iov does not contain the rfc1002 length and iov[0] has the 870 * SMB2 header. 871 * 872 * @ses: server session structure 873 * @server: pointer to server info 874 * @iov: array containing the SMB request we will send to the server 875 * @nvec: number of array entries for the iov 876 */ 877 int 878 smb311_update_preauth_hash(struct cifs_ses *ses, struct TCP_Server_Info *server, 879 struct kvec *iov, int nvec) 880 { 881 int i, rc; 882 struct smb2_hdr *hdr; 883 struct shash_desc *sha512 = NULL; 884 885 hdr = (struct smb2_hdr *)iov[0].iov_base; 886 /* neg prot are always taken */ 887 if (hdr->Command == SMB2_NEGOTIATE) 888 goto ok; 889 890 /* 891 * If we process a command which wasn't a negprot it means the 892 * neg prot was already done, so the server dialect was set 893 * and we can test it. Preauth requires 3.1.1 for now. 894 */ 895 if (server->dialect != SMB311_PROT_ID) 896 return 0; 897 898 if (hdr->Command != SMB2_SESSION_SETUP) 899 return 0; 900 901 /* skip last sess setup response */ 902 if ((hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) 903 && (hdr->Status == NT_STATUS_OK 904 || (hdr->Status != 905 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)))) 906 return 0; 907 908 ok: 909 rc = smb311_crypto_shash_allocate(server); 910 if (rc) 911 return rc; 912 913 sha512 = server->secmech.sha512; 914 rc = crypto_shash_init(sha512); 915 if (rc) { 916 cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__); 917 return rc; 918 } 919 920 rc = crypto_shash_update(sha512, ses->preauth_sha_hash, 921 SMB2_PREAUTH_HASH_SIZE); 922 if (rc) { 923 cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__); 924 return rc; 925 } 926 927 for (i = 0; i < nvec; i++) { 928 rc = crypto_shash_update(sha512, iov[i].iov_base, iov[i].iov_len); 929 if (rc) { 930 cifs_dbg(VFS, "%s: Could not update sha512 shash\n", 931 __func__); 932 return rc; 933 } 934 } 935 936 rc = crypto_shash_final(sha512, ses->preauth_sha_hash); 937 if (rc) { 938 cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n", 939 __func__); 940 return rc; 941 } 942 943 return 0; 944 } 945