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 "smb2pdu.h"
12 #include "cifsglob.h"
13 #include "cifsproto.h"
14 #include "smb2proto.h"
15 #include "cifs_debug.h"
16 #include "cifs_unicode.h"
17 #include "smb2status.h"
18 #include "smb2glob.h"
19 #include "nterr.h"
20
21 static int
check_smb2_hdr(struct smb2_sync_hdr * shdr,__u64 mid)22 check_smb2_hdr(struct smb2_sync_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_sync_hdr) + sizeof(struct smb2_negotiate_rsp))
85
get_neg_ctxt_len(struct smb2_sync_hdr * hdr,__u32 len,__u32 non_ctxlen)86 static __u32 get_neg_ctxt_len(struct smb2_sync_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
135 int
smb2_check_message(char * buf,unsigned int len,struct TCP_Server_Info * srvr)136 smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
137 {
138 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
139 struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr;
140 __u64 mid;
141 __u32 clc_len; /* calculated length */
142 int command;
143 int pdu_size = sizeof(struct smb2_sync_pdu);
144 int hdr_size = sizeof(struct smb2_sync_hdr);
145
146 /*
147 * Add function to do table lookup of StructureSize by command
148 * ie Validate the wct via smb2_struct_sizes table above
149 */
150 if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
151 struct smb2_transform_hdr *thdr =
152 (struct smb2_transform_hdr *)buf;
153 struct cifs_ses *ses = NULL;
154
155 /* decrypt frame now that it is completely read in */
156 spin_lock(&cifs_tcp_ses_lock);
157 list_for_each_entry(ses, &srvr->smb_ses_list, smb_ses_list) {
158 if (ses->Suid == thdr->SessionId)
159 break;
160 }
161 spin_unlock(&cifs_tcp_ses_lock);
162 if (list_entry_is_head(ses, &srvr->smb_ses_list,
163 smb_ses_list)) {
164 cifs_dbg(VFS, "no decryption - session id not found\n");
165 return 1;
166 }
167 }
168
169 mid = le64_to_cpu(shdr->MessageId);
170 if (len < pdu_size) {
171 if ((len >= hdr_size)
172 && (shdr->Status != 0)) {
173 pdu->StructureSize2 = 0;
174 /*
175 * As with SMB/CIFS, on some error cases servers may
176 * not return wct properly
177 */
178 return 0;
179 } else {
180 cifs_dbg(VFS, "Length less than SMB header size\n");
181 }
182 return 1;
183 }
184 if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
185 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
186 mid);
187 return 1;
188 }
189
190 if (check_smb2_hdr(shdr, mid))
191 return 1;
192
193 if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
194 cifs_dbg(VFS, "Invalid structure size %u\n",
195 le16_to_cpu(shdr->StructureSize));
196 return 1;
197 }
198
199 command = le16_to_cpu(shdr->Command);
200 if (command >= NUMBER_OF_SMB2_COMMANDS) {
201 cifs_dbg(VFS, "Invalid SMB2 command %d\n", command);
202 return 1;
203 }
204
205 if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
206 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
207 pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
208 /* error packets have 9 byte structure size */
209 cifs_dbg(VFS, "Invalid response size %u for command %d\n",
210 le16_to_cpu(pdu->StructureSize2), command);
211 return 1;
212 } else if (command == SMB2_OPLOCK_BREAK_HE
213 && (shdr->Status == 0)
214 && (le16_to_cpu(pdu->StructureSize2) != 44)
215 && (le16_to_cpu(pdu->StructureSize2) != 36)) {
216 /* special case for SMB2.1 lease break message */
217 cifs_dbg(VFS, "Invalid response size %d for oplock break\n",
218 le16_to_cpu(pdu->StructureSize2));
219 return 1;
220 }
221 }
222
223 clc_len = smb2_calc_size(buf, srvr);
224
225 if (shdr->Command == SMB2_NEGOTIATE)
226 clc_len += get_neg_ctxt_len(shdr, len, clc_len);
227
228 if (len != clc_len) {
229 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
230 clc_len, len, mid);
231 /* create failed on symlink */
232 if (command == SMB2_CREATE_HE &&
233 shdr->Status == STATUS_STOPPED_ON_SYMLINK)
234 return 0;
235 /* Windows 7 server returns 24 bytes more */
236 if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
237 return 0;
238 /* server can return one byte more due to implied bcc[0] */
239 if (clc_len == len + 1)
240 return 0;
241
242 /*
243 * Some windows servers (win2016) will pad also the final
244 * PDU in a compound to 8 bytes.
245 */
246 if (((clc_len + 7) & ~7) == len)
247 return 0;
248
249 /*
250 * MacOS server pads after SMB2.1 write response with 3 bytes
251 * of junk. Other servers match RFC1001 len to actual
252 * SMB2/SMB3 frame length (header + smb2 response specific data)
253 * Some windows servers also pad up to 8 bytes when compounding.
254 */
255 if (clc_len < len)
256 return 0;
257
258 pr_warn_once(
259 "srv rsp too short, len %d not %d. cmd:%d mid:%llu\n",
260 len, clc_len, command, mid);
261
262 return 1;
263 }
264 return 0;
265 }
266
267 /*
268 * The size of the variable area depends on the offset and length fields
269 * located in different fields for various SMB2 responses. SMB2 responses
270 * with no variable length info, show an offset of zero for the offset field.
271 */
272 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
273 /* SMB2_NEGOTIATE */ true,
274 /* SMB2_SESSION_SETUP */ true,
275 /* SMB2_LOGOFF */ false,
276 /* SMB2_TREE_CONNECT */ false,
277 /* SMB2_TREE_DISCONNECT */ false,
278 /* SMB2_CREATE */ true,
279 /* SMB2_CLOSE */ false,
280 /* SMB2_FLUSH */ false,
281 /* SMB2_READ */ true,
282 /* SMB2_WRITE */ false,
283 /* SMB2_LOCK */ false,
284 /* SMB2_IOCTL */ true,
285 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
286 /* SMB2_ECHO */ false,
287 /* SMB2_QUERY_DIRECTORY */ true,
288 /* SMB2_CHANGE_NOTIFY */ true,
289 /* SMB2_QUERY_INFO */ true,
290 /* SMB2_SET_INFO */ false,
291 /* SMB2_OPLOCK_BREAK */ false
292 };
293
294 /*
295 * Returns the pointer to the beginning of the data area. Length of the data
296 * area and the offset to it (from the beginning of the smb are also returned.
297 */
298 char *
smb2_get_data_area_len(int * off,int * len,struct smb2_sync_hdr * shdr)299 smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr)
300 {
301 *off = 0;
302 *len = 0;
303
304 /* error responses do not have data area */
305 if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
306 (((struct smb2_err_rsp *)shdr)->StructureSize) ==
307 SMB2_ERROR_STRUCTURE_SIZE2)
308 return NULL;
309
310 /*
311 * Following commands have data areas so we have to get the location
312 * of the data buffer offset and data buffer length for the particular
313 * command.
314 */
315 switch (shdr->Command) {
316 case SMB2_NEGOTIATE:
317 *off = le16_to_cpu(
318 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
319 *len = le16_to_cpu(
320 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
321 break;
322 case SMB2_SESSION_SETUP:
323 *off = le16_to_cpu(
324 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
325 *len = le16_to_cpu(
326 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
327 break;
328 case SMB2_CREATE:
329 *off = le32_to_cpu(
330 ((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
331 *len = le32_to_cpu(
332 ((struct smb2_create_rsp *)shdr)->CreateContextsLength);
333 break;
334 case SMB2_QUERY_INFO:
335 *off = le16_to_cpu(
336 ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
337 *len = le32_to_cpu(
338 ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
339 break;
340 case SMB2_READ:
341 /* TODO: is this a bug ? */
342 *off = ((struct smb2_read_rsp *)shdr)->DataOffset;
343 *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
344 break;
345 case SMB2_QUERY_DIRECTORY:
346 *off = le16_to_cpu(
347 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
348 *len = le32_to_cpu(
349 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
350 break;
351 case SMB2_IOCTL:
352 *off = le32_to_cpu(
353 ((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
354 *len = le32_to_cpu(
355 ((struct smb2_ioctl_rsp *)shdr)->OutputCount);
356 break;
357 case SMB2_CHANGE_NOTIFY:
358 *off = le16_to_cpu(
359 ((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset);
360 *len = le32_to_cpu(
361 ((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength);
362 break;
363 default:
364 cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command));
365 break;
366 }
367
368 /*
369 * Invalid length or offset probably means data area is invalid, but
370 * we have little choice but to ignore the data area in this case.
371 */
372 if (*off > 4096) {
373 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
374 *len = 0;
375 *off = 0;
376 } else if (*off < 0) {
377 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
378 *off);
379 *off = 0;
380 *len = 0;
381 } else if (*len < 0) {
382 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
383 *len);
384 *len = 0;
385 } else if (*len > 128 * 1024) {
386 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
387 *len = 0;
388 }
389
390 /* return pointer to beginning of data area, ie offset from SMB start */
391 if ((*off != 0) && (*len != 0))
392 return (char *)shdr + *off;
393 else
394 return NULL;
395 }
396
397 /*
398 * Calculate the size of the SMB message based on the fixed header
399 * portion, the number of word parameters and the data portion of the message.
400 */
401 unsigned int
smb2_calc_size(void * buf,struct TCP_Server_Info * srvr)402 smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
403 {
404 struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf;
405 struct smb2_sync_hdr *shdr = &pdu->sync_hdr;
406 int offset; /* the offset from the beginning of SMB to data area */
407 int data_length; /* the length of the variable length data area */
408 /* Structure Size has already been checked to make sure it is 64 */
409 int len = le16_to_cpu(shdr->StructureSize);
410
411 /*
412 * StructureSize2, ie length of fixed parameter area has already
413 * been checked to make sure it is the correct length.
414 */
415 len += le16_to_cpu(pdu->StructureSize2);
416
417 if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
418 goto calc_size_exit;
419
420 smb2_get_data_area_len(&offset, &data_length, shdr);
421 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
422
423 if (data_length > 0) {
424 /*
425 * Check to make sure that data area begins after fixed area,
426 * Note that last byte of the fixed area is part of data area
427 * for some commands, typically those with odd StructureSize,
428 * so we must add one to the calculation.
429 */
430 if (offset + 1 < len) {
431 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
432 offset + 1, len);
433 data_length = 0;
434 } else {
435 len = offset + data_length;
436 }
437 }
438 calc_size_exit:
439 cifs_dbg(FYI, "SMB2 len %d\n", len);
440 return len;
441 }
442
443 /* Note: caller must free return buffer */
444 __le16 *
cifs_convert_path_to_utf16(const char * from,struct cifs_sb_info * cifs_sb)445 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
446 {
447 int len;
448 const char *start_of_path;
449 __le16 *to;
450 int map_type;
451
452 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
453 map_type = SFM_MAP_UNI_RSVD;
454 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
455 map_type = SFU_MAP_UNI_RSVD;
456 else
457 map_type = NO_MAP_UNI_RSVD;
458
459 /* Windows doesn't allow paths beginning with \ */
460 if (from[0] == '\\')
461 start_of_path = from + 1;
462
463 /* SMB311 POSIX extensions paths do not include leading slash */
464 else if (cifs_sb_master_tlink(cifs_sb) &&
465 cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
466 (from[0] == '/')) {
467 start_of_path = from + 1;
468 } else
469 start_of_path = from;
470
471 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
472 cifs_sb->local_nls, map_type);
473 return to;
474 }
475
476 __le32
smb2_get_lease_state(struct cifsInodeInfo * cinode)477 smb2_get_lease_state(struct cifsInodeInfo *cinode)
478 {
479 __le32 lease = 0;
480
481 if (CIFS_CACHE_WRITE(cinode))
482 lease |= SMB2_LEASE_WRITE_CACHING;
483 if (CIFS_CACHE_HANDLE(cinode))
484 lease |= SMB2_LEASE_HANDLE_CACHING;
485 if (CIFS_CACHE_READ(cinode))
486 lease |= SMB2_LEASE_READ_CACHING;
487 return lease;
488 }
489
490 struct smb2_lease_break_work {
491 struct work_struct lease_break;
492 struct tcon_link *tlink;
493 __u8 lease_key[16];
494 __le32 lease_state;
495 };
496
497 static void
cifs_ses_oplock_break(struct work_struct * work)498 cifs_ses_oplock_break(struct work_struct *work)
499 {
500 struct smb2_lease_break_work *lw = container_of(work,
501 struct smb2_lease_break_work, lease_break);
502 int rc = 0;
503
504 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
505 lw->lease_state);
506
507 cifs_dbg(FYI, "Lease release rc %d\n", rc);
508 cifs_put_tlink(lw->tlink);
509 kfree(lw);
510 }
511
512 static void
smb2_queue_pending_open_break(struct tcon_link * tlink,__u8 * lease_key,__le32 new_lease_state)513 smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key,
514 __le32 new_lease_state)
515 {
516 struct smb2_lease_break_work *lw;
517
518 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
519 if (!lw) {
520 cifs_put_tlink(tlink);
521 return;
522 }
523
524 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
525 lw->tlink = tlink;
526 lw->lease_state = new_lease_state;
527 memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE);
528 queue_work(cifsiod_wq, &lw->lease_break);
529 }
530
531 static bool
smb2_tcon_has_lease(struct cifs_tcon * tcon,struct smb2_lease_break * rsp)532 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp)
533 {
534 __u8 lease_state;
535 struct cifsFileInfo *cfile;
536 struct cifsInodeInfo *cinode;
537 int ack_req = le32_to_cpu(rsp->Flags &
538 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
539
540 lease_state = le32_to_cpu(rsp->NewLeaseState);
541
542 list_for_each_entry(cfile, &tcon->openFileList, tlist) {
543 cinode = CIFS_I(d_inode(cfile->dentry));
544
545 if (memcmp(cinode->lease_key, rsp->LeaseKey,
546 SMB2_LEASE_KEY_SIZE))
547 continue;
548
549 cifs_dbg(FYI, "found in the open list\n");
550 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
551 lease_state);
552
553 if (ack_req)
554 cfile->oplock_break_cancelled = false;
555 else
556 cfile->oplock_break_cancelled = true;
557
558 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
559
560 cfile->oplock_epoch = le16_to_cpu(rsp->Epoch);
561 cfile->oplock_level = lease_state;
562
563 cifs_queue_oplock_break(cfile);
564 return true;
565 }
566
567 return false;
568 }
569
570 static struct cifs_pending_open *
smb2_tcon_find_pending_open_lease(struct cifs_tcon * tcon,struct smb2_lease_break * rsp)571 smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon,
572 struct smb2_lease_break *rsp)
573 {
574 __u8 lease_state = le32_to_cpu(rsp->NewLeaseState);
575 int ack_req = le32_to_cpu(rsp->Flags &
576 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
577 struct cifs_pending_open *open;
578 struct cifs_pending_open *found = NULL;
579
580 list_for_each_entry(open, &tcon->pending_opens, olist) {
581 if (memcmp(open->lease_key, rsp->LeaseKey,
582 SMB2_LEASE_KEY_SIZE))
583 continue;
584
585 if (!found && ack_req) {
586 found = open;
587 }
588
589 cifs_dbg(FYI, "found in the pending open list\n");
590 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
591 lease_state);
592
593 open->oplock = lease_state;
594 }
595
596 return found;
597 }
598
599 static bool
smb2_is_valid_lease_break(char * buffer)600 smb2_is_valid_lease_break(char *buffer)
601 {
602 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
603 struct TCP_Server_Info *server;
604 struct cifs_ses *ses;
605 struct cifs_tcon *tcon;
606 struct cifs_pending_open *open;
607
608 cifs_dbg(FYI, "Checking for lease break\n");
609
610 /* look up tcon based on tid & uid */
611 spin_lock(&cifs_tcp_ses_lock);
612 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
613 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
614 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
615 spin_lock(&tcon->open_file_lock);
616 cifs_stats_inc(
617 &tcon->stats.cifs_stats.num_oplock_brks);
618 if (smb2_tcon_has_lease(tcon, rsp)) {
619 spin_unlock(&tcon->open_file_lock);
620 spin_unlock(&cifs_tcp_ses_lock);
621 return true;
622 }
623 open = smb2_tcon_find_pending_open_lease(tcon,
624 rsp);
625 if (open) {
626 __u8 lease_key[SMB2_LEASE_KEY_SIZE];
627 struct tcon_link *tlink;
628
629 tlink = cifs_get_tlink(open->tlink);
630 memcpy(lease_key, open->lease_key,
631 SMB2_LEASE_KEY_SIZE);
632 spin_unlock(&tcon->open_file_lock);
633 spin_unlock(&cifs_tcp_ses_lock);
634 smb2_queue_pending_open_break(tlink,
635 lease_key,
636 rsp->NewLeaseState);
637 return true;
638 }
639 spin_unlock(&tcon->open_file_lock);
640
641 if (tcon->crfid.is_valid &&
642 !memcmp(rsp->LeaseKey,
643 tcon->crfid.fid->lease_key,
644 SMB2_LEASE_KEY_SIZE)) {
645 tcon->crfid.time = 0;
646 INIT_WORK(&tcon->crfid.lease_break,
647 smb2_cached_lease_break);
648 queue_work(cifsiod_wq,
649 &tcon->crfid.lease_break);
650 spin_unlock(&cifs_tcp_ses_lock);
651 return true;
652 }
653 }
654 }
655 }
656 spin_unlock(&cifs_tcp_ses_lock);
657 cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
658 return false;
659 }
660
661 bool
smb2_is_valid_oplock_break(char * buffer,struct TCP_Server_Info * server)662 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
663 {
664 struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
665 struct cifs_ses *ses;
666 struct cifs_tcon *tcon;
667 struct cifsInodeInfo *cinode;
668 struct cifsFileInfo *cfile;
669
670 cifs_dbg(FYI, "Checking for oplock break\n");
671
672 if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
673 return false;
674
675 if (rsp->StructureSize !=
676 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
677 if (le16_to_cpu(rsp->StructureSize) == 44)
678 return smb2_is_valid_lease_break(buffer);
679 else
680 return false;
681 }
682
683 cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
684
685 /* look up tcon based on tid & uid */
686 spin_lock(&cifs_tcp_ses_lock);
687 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
688 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
689
690 spin_lock(&tcon->open_file_lock);
691 list_for_each_entry(cfile, &tcon->openFileList, tlist) {
692 if (rsp->PersistentFid !=
693 cfile->fid.persistent_fid ||
694 rsp->VolatileFid !=
695 cfile->fid.volatile_fid)
696 continue;
697
698 cifs_dbg(FYI, "file id match, oplock break\n");
699 cifs_stats_inc(
700 &tcon->stats.cifs_stats.num_oplock_brks);
701 cinode = CIFS_I(d_inode(cfile->dentry));
702 spin_lock(&cfile->file_info_lock);
703 if (!CIFS_CACHE_WRITE(cinode) &&
704 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
705 cfile->oplock_break_cancelled = true;
706 else
707 cfile->oplock_break_cancelled = false;
708
709 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
710 &cinode->flags);
711
712 cfile->oplock_epoch = 0;
713 cfile->oplock_level = rsp->OplockLevel;
714
715 spin_unlock(&cfile->file_info_lock);
716
717 cifs_queue_oplock_break(cfile);
718
719 spin_unlock(&tcon->open_file_lock);
720 spin_unlock(&cifs_tcp_ses_lock);
721 return true;
722 }
723 spin_unlock(&tcon->open_file_lock);
724 }
725 }
726 spin_unlock(&cifs_tcp_ses_lock);
727 cifs_dbg(FYI, "No file id matched, oplock break ignored\n");
728 return true;
729 }
730
731 void
smb2_cancelled_close_fid(struct work_struct * work)732 smb2_cancelled_close_fid(struct work_struct *work)
733 {
734 struct close_cancelled_open *cancelled = container_of(work,
735 struct close_cancelled_open, work);
736 struct cifs_tcon *tcon = cancelled->tcon;
737 int rc;
738
739 if (cancelled->mid)
740 cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llu\n",
741 cancelled->mid);
742 else
743 cifs_tcon_dbg(VFS, "Close interrupted close\n");
744
745 rc = SMB2_close(0, tcon, cancelled->fid.persistent_fid,
746 cancelled->fid.volatile_fid);
747 if (rc)
748 cifs_tcon_dbg(VFS, "Close cancelled mid failed rc:%d\n", rc);
749
750 cifs_put_tcon(tcon);
751 kfree(cancelled);
752 }
753
754 /*
755 * Caller should already has an extra reference to @tcon
756 * This function is used to queue work to close a handle to prevent leaks
757 * on the server.
758 * We handle two cases. If an open was interrupted after we sent the
759 * SMB2_CREATE to the server but before we processed the reply, and second
760 * if a close was interrupted before we sent the SMB2_CLOSE to the server.
761 */
762 static int
__smb2_handle_cancelled_cmd(struct cifs_tcon * tcon,__u16 cmd,__u64 mid,__u64 persistent_fid,__u64 volatile_fid)763 __smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid,
764 __u64 persistent_fid, __u64 volatile_fid)
765 {
766 struct close_cancelled_open *cancelled;
767
768 cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC);
769 if (!cancelled)
770 return -ENOMEM;
771
772 cancelled->fid.persistent_fid = persistent_fid;
773 cancelled->fid.volatile_fid = volatile_fid;
774 cancelled->tcon = tcon;
775 cancelled->cmd = cmd;
776 cancelled->mid = mid;
777 INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
778 WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false);
779
780 return 0;
781 }
782
783 int
smb2_handle_cancelled_close(struct cifs_tcon * tcon,__u64 persistent_fid,__u64 volatile_fid)784 smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,
785 __u64 volatile_fid)
786 {
787 int rc;
788
789 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
790 spin_lock(&cifs_tcp_ses_lock);
791 if (tcon->tc_count <= 0) {
792 struct TCP_Server_Info *server = NULL;
793
794 WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative");
795 spin_unlock(&cifs_tcp_ses_lock);
796
797 if (tcon->ses)
798 server = tcon->ses->server;
799
800 cifs_server_dbg(FYI, "tid=%u: tcon is closing, skipping async close retry of fid %llu %llu\n",
801 tcon->tid, persistent_fid, volatile_fid);
802
803 return 0;
804 }
805 tcon->tc_count++;
806 spin_unlock(&cifs_tcp_ses_lock);
807
808 rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0,
809 persistent_fid, volatile_fid);
810 if (rc)
811 cifs_put_tcon(tcon);
812
813 return rc;
814 }
815
816 int
smb2_handle_cancelled_mid(struct mid_q_entry * mid,struct TCP_Server_Info * server)817 smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server)
818 {
819 struct smb2_sync_hdr *sync_hdr = mid->resp_buf;
820 struct smb2_create_rsp *rsp = mid->resp_buf;
821 struct cifs_tcon *tcon;
822 int rc;
823
824 if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || sync_hdr->Command != SMB2_CREATE ||
825 sync_hdr->Status != STATUS_SUCCESS)
826 return 0;
827
828 tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
829 sync_hdr->TreeId);
830 if (!tcon)
831 return -ENOENT;
832
833 rc = __smb2_handle_cancelled_cmd(tcon,
834 le16_to_cpu(sync_hdr->Command),
835 le64_to_cpu(sync_hdr->MessageId),
836 rsp->PersistentFileId,
837 rsp->VolatileFileId);
838 if (rc)
839 cifs_put_tcon(tcon);
840
841 return rc;
842 }
843
844 /**
845 * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
846 *
847 * Assumes @iov does not contain the rfc1002 length and iov[0] has the
848 * SMB2 header.
849 *
850 * @ses: server session structure
851 * @iov: array containing the SMB request we will send to the server
852 * @nvec: number of array entries for the iov
853 */
854 int
smb311_update_preauth_hash(struct cifs_ses * ses,struct kvec * iov,int nvec)855 smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
856 {
857 int i, rc;
858 struct sdesc *d;
859 struct smb2_sync_hdr *hdr;
860 struct TCP_Server_Info *server = cifs_ses_server(ses);
861
862 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
863 /* neg prot are always taken */
864 if (hdr->Command == SMB2_NEGOTIATE)
865 goto ok;
866
867 /*
868 * If we process a command which wasn't a negprot it means the
869 * neg prot was already done, so the server dialect was set
870 * and we can test it. Preauth requires 3.1.1 for now.
871 */
872 if (server->dialect != SMB311_PROT_ID)
873 return 0;
874
875 if (hdr->Command != SMB2_SESSION_SETUP)
876 return 0;
877
878 /* skip last sess setup response */
879 if ((hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
880 && (hdr->Status == NT_STATUS_OK
881 || (hdr->Status !=
882 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))))
883 return 0;
884
885 ok:
886 rc = smb311_crypto_shash_allocate(server);
887 if (rc)
888 return rc;
889
890 d = server->secmech.sdescsha512;
891 rc = crypto_shash_init(&d->shash);
892 if (rc) {
893 cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__);
894 return rc;
895 }
896
897 rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
898 SMB2_PREAUTH_HASH_SIZE);
899 if (rc) {
900 cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__);
901 return rc;
902 }
903
904 for (i = 0; i < nvec; i++) {
905 rc = crypto_shash_update(&d->shash,
906 iov[i].iov_base, iov[i].iov_len);
907 if (rc) {
908 cifs_dbg(VFS, "%s: Could not update sha512 shash\n",
909 __func__);
910 return rc;
911 }
912 }
913
914 rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
915 if (rc) {
916 cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n",
917 __func__);
918 return rc;
919 }
920
921 return 0;
922 }
923
