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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
21static int
22check_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 */
60static 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
86static __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)
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
135int
136smb2_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 */
287static 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 */
313char *
314smb2_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 */
416unsigned int
417smb2_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 }
453calc_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 *
460cifs_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
492smb2_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
505struct 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
512static void
513cifs_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
527static void
528smb2_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
546static bool
547smb2_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
585static struct cifs_pending_open *
586smb2_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
614static bool
615smb2_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
675bool
676smb2_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
753void
754smb2_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 */
784static 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
805int
806smb2_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
838int
839smb2_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 */
877int
878smb311_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
908ok:
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}