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 + 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
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 const int max_off = 4096;
302 const int max_len = 128 * 1024;
303
304 *off = 0;
305 *len = 0;
306
307 /* error responses do not have data area */
308 if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
309 (((struct smb2_err_rsp *)shdr)->StructureSize) ==
310 SMB2_ERROR_STRUCTURE_SIZE2)
311 return NULL;
312
313 /*
314 * Following commands have data areas so we have to get the location
315 * of the data buffer offset and data buffer length for the particular
316 * command.
317 */
318 switch (shdr->Command) {
319 case SMB2_NEGOTIATE:
320 *off = le16_to_cpu(
321 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
322 *len = le16_to_cpu(
323 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
324 break;
325 case SMB2_SESSION_SETUP:
326 *off = le16_to_cpu(
327 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
328 *len = le16_to_cpu(
329 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
330 break;
331 case SMB2_CREATE:
332 *off = le32_to_cpu(
333 ((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
334 *len = le32_to_cpu(
335 ((struct smb2_create_rsp *)shdr)->CreateContextsLength);
336 break;
337 case SMB2_QUERY_INFO:
338 *off = le16_to_cpu(
339 ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
340 *len = le32_to_cpu(
341 ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
342 break;
343 case SMB2_READ:
344 /* TODO: is this a bug ? */
345 *off = ((struct smb2_read_rsp *)shdr)->DataOffset;
346 *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
347 break;
348 case SMB2_QUERY_DIRECTORY:
349 *off = le16_to_cpu(
350 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
351 *len = le32_to_cpu(
352 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
353 break;
354 case SMB2_IOCTL:
355 *off = le32_to_cpu(
356 ((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
357 *len = le32_to_cpu(
358 ((struct smb2_ioctl_rsp *)shdr)->OutputCount);
359 break;
360 case SMB2_CHANGE_NOTIFY:
361 *off = le16_to_cpu(
362 ((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset);
363 *len = le32_to_cpu(
364 ((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength);
365 break;
366 default:
367 cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command));
368 break;
369 }
370
371 /*
372 * Invalid length or offset probably means data area is invalid, but
373 * we have little choice but to ignore the data area in this case.
374 */
375 if (unlikely(*off < 0 || *off > max_off ||
376 *len < 0 || *len > max_len)) {
377 cifs_dbg(VFS, "%s: invalid data area (off=%d len=%d)\n",
378 __func__, *off, *len);
379 *off = 0;
380 *len = 0;
381 } else if (*off == 0) {
382 *len = 0;
383 }
384
385 /* return pointer to beginning of data area, ie offset from SMB start */
386 if (*off > 0 && *len > 0)
387 return (char *)shdr + *off;
388 return NULL;
389 }
390
391 /*
392 * Calculate the size of the SMB message based on the fixed header
393 * portion, the number of word parameters and the data portion of the message.
394 */
395 unsigned int
smb2_calc_size(void * buf,struct TCP_Server_Info * srvr)396 smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
397 {
398 struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf;
399 struct smb2_sync_hdr *shdr = &pdu->sync_hdr;
400 int offset; /* the offset from the beginning of SMB to data area */
401 int data_length; /* the length of the variable length data area */
402 /* Structure Size has already been checked to make sure it is 64 */
403 int len = le16_to_cpu(shdr->StructureSize);
404
405 /*
406 * StructureSize2, ie length of fixed parameter area has already
407 * been checked to make sure it is the correct length.
408 */
409 len += le16_to_cpu(pdu->StructureSize2);
410
411 if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
412 goto calc_size_exit;
413
414 smb2_get_data_area_len(&offset, &data_length, shdr);
415 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
416
417 if (data_length > 0) {
418 /*
419 * Check to make sure that data area begins after fixed area,
420 * Note that last byte of the fixed area is part of data area
421 * for some commands, typically those with odd StructureSize,
422 * so we must add one to the calculation.
423 */
424 if (offset + 1 < len) {
425 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
426 offset + 1, len);
427 data_length = 0;
428 } else {
429 len = offset + data_length;
430 }
431 }
432 calc_size_exit:
433 cifs_dbg(FYI, "SMB2 len %d\n", len);
434 return len;
435 }
436
437 /* Note: caller must free return buffer */
438 __le16 *
cifs_convert_path_to_utf16(const char * from,struct cifs_sb_info * cifs_sb)439 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
440 {
441 int len;
442 const char *start_of_path;
443 __le16 *to;
444 int map_type;
445
446 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
447 map_type = SFM_MAP_UNI_RSVD;
448 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
449 map_type = SFU_MAP_UNI_RSVD;
450 else
451 map_type = NO_MAP_UNI_RSVD;
452
453 /* Windows doesn't allow paths beginning with \ */
454 if (from[0] == '\\')
455 start_of_path = from + 1;
456
457 /* SMB311 POSIX extensions paths do not include leading slash */
458 else if (cifs_sb_master_tlink(cifs_sb) &&
459 cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
460 (from[0] == '/')) {
461 start_of_path = from + 1;
462 } else
463 start_of_path = from;
464
465 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
466 cifs_sb->local_nls, map_type);
467 return to;
468 }
469
470 __le32
smb2_get_lease_state(struct cifsInodeInfo * cinode)471 smb2_get_lease_state(struct cifsInodeInfo *cinode)
472 {
473 __le32 lease = 0;
474
475 if (CIFS_CACHE_WRITE(cinode))
476 lease |= SMB2_LEASE_WRITE_CACHING;
477 if (CIFS_CACHE_HANDLE(cinode))
478 lease |= SMB2_LEASE_HANDLE_CACHING;
479 if (CIFS_CACHE_READ(cinode))
480 lease |= SMB2_LEASE_READ_CACHING;
481 return lease;
482 }
483
484 struct smb2_lease_break_work {
485 struct work_struct lease_break;
486 struct tcon_link *tlink;
487 __u8 lease_key[16];
488 __le32 lease_state;
489 };
490
491 static void
cifs_ses_oplock_break(struct work_struct * work)492 cifs_ses_oplock_break(struct work_struct *work)
493 {
494 struct smb2_lease_break_work *lw = container_of(work,
495 struct smb2_lease_break_work, lease_break);
496 int rc = 0;
497
498 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
499 lw->lease_state);
500
501 cifs_dbg(FYI, "Lease release rc %d\n", rc);
502 cifs_put_tlink(lw->tlink);
503 kfree(lw);
504 }
505
506 static void
smb2_queue_pending_open_break(struct tcon_link * tlink,__u8 * lease_key,__le32 new_lease_state)507 smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key,
508 __le32 new_lease_state)
509 {
510 struct smb2_lease_break_work *lw;
511
512 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
513 if (!lw) {
514 cifs_put_tlink(tlink);
515 return;
516 }
517
518 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
519 lw->tlink = tlink;
520 lw->lease_state = new_lease_state;
521 memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE);
522 queue_work(cifsiod_wq, &lw->lease_break);
523 }
524
525 static bool
smb2_tcon_has_lease(struct cifs_tcon * tcon,struct smb2_lease_break * rsp)526 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp)
527 {
528 __u8 lease_state;
529 struct cifsFileInfo *cfile;
530 struct cifsInodeInfo *cinode;
531 int ack_req = le32_to_cpu(rsp->Flags &
532 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
533
534 lease_state = le32_to_cpu(rsp->NewLeaseState);
535
536 list_for_each_entry(cfile, &tcon->openFileList, tlist) {
537 cinode = CIFS_I(d_inode(cfile->dentry));
538
539 if (memcmp(cinode->lease_key, rsp->LeaseKey,
540 SMB2_LEASE_KEY_SIZE))
541 continue;
542
543 cifs_dbg(FYI, "found in the open list\n");
544 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
545 lease_state);
546
547 if (ack_req)
548 cfile->oplock_break_cancelled = false;
549 else
550 cfile->oplock_break_cancelled = true;
551
552 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
553
554 cfile->oplock_epoch = le16_to_cpu(rsp->Epoch);
555 cfile->oplock_level = lease_state;
556
557 cifs_queue_oplock_break(cfile);
558 return true;
559 }
560
561 return false;
562 }
563
564 static struct cifs_pending_open *
smb2_tcon_find_pending_open_lease(struct cifs_tcon * tcon,struct smb2_lease_break * rsp)565 smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon,
566 struct smb2_lease_break *rsp)
567 {
568 __u8 lease_state = le32_to_cpu(rsp->NewLeaseState);
569 int ack_req = le32_to_cpu(rsp->Flags &
570 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
571 struct cifs_pending_open *open;
572 struct cifs_pending_open *found = NULL;
573
574 list_for_each_entry(open, &tcon->pending_opens, olist) {
575 if (memcmp(open->lease_key, rsp->LeaseKey,
576 SMB2_LEASE_KEY_SIZE))
577 continue;
578
579 if (!found && ack_req) {
580 found = open;
581 }
582
583 cifs_dbg(FYI, "found in the pending open list\n");
584 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
585 lease_state);
586
587 open->oplock = lease_state;
588 }
589
590 return found;
591 }
592
593 static bool
smb2_is_valid_lease_break(char * buffer)594 smb2_is_valid_lease_break(char *buffer)
595 {
596 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
597 struct TCP_Server_Info *server;
598 struct cifs_ses *ses;
599 struct cifs_tcon *tcon;
600 struct cifs_pending_open *open;
601
602 cifs_dbg(FYI, "Checking for lease break\n");
603
604 /* look up tcon based on tid & uid */
605 spin_lock(&cifs_tcp_ses_lock);
606 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
607 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
608 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
609 spin_lock(&tcon->open_file_lock);
610 cifs_stats_inc(
611 &tcon->stats.cifs_stats.num_oplock_brks);
612 if (smb2_tcon_has_lease(tcon, rsp)) {
613 spin_unlock(&tcon->open_file_lock);
614 spin_unlock(&cifs_tcp_ses_lock);
615 return true;
616 }
617 open = smb2_tcon_find_pending_open_lease(tcon,
618 rsp);
619 if (open) {
620 __u8 lease_key[SMB2_LEASE_KEY_SIZE];
621 struct tcon_link *tlink;
622
623 tlink = cifs_get_tlink(open->tlink);
624 memcpy(lease_key, open->lease_key,
625 SMB2_LEASE_KEY_SIZE);
626 spin_unlock(&tcon->open_file_lock);
627 spin_unlock(&cifs_tcp_ses_lock);
628 smb2_queue_pending_open_break(tlink,
629 lease_key,
630 rsp->NewLeaseState);
631 return true;
632 }
633 spin_unlock(&tcon->open_file_lock);
634
635 if (tcon->crfid.is_valid &&
636 !memcmp(rsp->LeaseKey,
637 tcon->crfid.fid->lease_key,
638 SMB2_LEASE_KEY_SIZE)) {
639 tcon->crfid.time = 0;
640 INIT_WORK(&tcon->crfid.lease_break,
641 smb2_cached_lease_break);
642 queue_work(cifsiod_wq,
643 &tcon->crfid.lease_break);
644 spin_unlock(&cifs_tcp_ses_lock);
645 return true;
646 }
647 }
648 }
649 }
650 spin_unlock(&cifs_tcp_ses_lock);
651 cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
652 return false;
653 }
654
655 bool
smb2_is_valid_oplock_break(char * buffer,struct TCP_Server_Info * server)656 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
657 {
658 struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
659 struct cifs_ses *ses;
660 struct cifs_tcon *tcon;
661 struct cifsInodeInfo *cinode;
662 struct cifsFileInfo *cfile;
663
664 cifs_dbg(FYI, "Checking for oplock break\n");
665
666 if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
667 return false;
668
669 if (rsp->StructureSize !=
670 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
671 if (le16_to_cpu(rsp->StructureSize) == 44)
672 return smb2_is_valid_lease_break(buffer);
673 else
674 return false;
675 }
676
677 cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
678
679 /* look up tcon based on tid & uid */
680 spin_lock(&cifs_tcp_ses_lock);
681 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
682 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
683
684 spin_lock(&tcon->open_file_lock);
685 list_for_each_entry(cfile, &tcon->openFileList, tlist) {
686 if (rsp->PersistentFid !=
687 cfile->fid.persistent_fid ||
688 rsp->VolatileFid !=
689 cfile->fid.volatile_fid)
690 continue;
691
692 cifs_dbg(FYI, "file id match, oplock break\n");
693 cifs_stats_inc(
694 &tcon->stats.cifs_stats.num_oplock_brks);
695 cinode = CIFS_I(d_inode(cfile->dentry));
696 spin_lock(&cfile->file_info_lock);
697 if (!CIFS_CACHE_WRITE(cinode) &&
698 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
699 cfile->oplock_break_cancelled = true;
700 else
701 cfile->oplock_break_cancelled = false;
702
703 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
704 &cinode->flags);
705
706 cfile->oplock_epoch = 0;
707 cfile->oplock_level = rsp->OplockLevel;
708
709 spin_unlock(&cfile->file_info_lock);
710
711 cifs_queue_oplock_break(cfile);
712
713 spin_unlock(&tcon->open_file_lock);
714 spin_unlock(&cifs_tcp_ses_lock);
715 return true;
716 }
717 spin_unlock(&tcon->open_file_lock);
718 }
719 }
720 spin_unlock(&cifs_tcp_ses_lock);
721 cifs_dbg(FYI, "No file id matched, oplock break ignored\n");
722 return true;
723 }
724
725 void
smb2_cancelled_close_fid(struct work_struct * work)726 smb2_cancelled_close_fid(struct work_struct *work)
727 {
728 struct close_cancelled_open *cancelled = container_of(work,
729 struct close_cancelled_open, work);
730 struct cifs_tcon *tcon = cancelled->tcon;
731 int rc;
732
733 if (cancelled->mid)
734 cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llu\n",
735 cancelled->mid);
736 else
737 cifs_tcon_dbg(VFS, "Close interrupted close\n");
738
739 rc = SMB2_close(0, tcon, cancelled->fid.persistent_fid,
740 cancelled->fid.volatile_fid);
741 if (rc)
742 cifs_tcon_dbg(VFS, "Close cancelled mid failed rc:%d\n", rc);
743
744 cifs_put_tcon(tcon);
745 kfree(cancelled);
746 }
747
748 /*
749 * Caller should already has an extra reference to @tcon
750 * This function is used to queue work to close a handle to prevent leaks
751 * on the server.
752 * We handle two cases. If an open was interrupted after we sent the
753 * SMB2_CREATE to the server but before we processed the reply, and second
754 * if a close was interrupted before we sent the SMB2_CLOSE to the server.
755 */
756 static int
__smb2_handle_cancelled_cmd(struct cifs_tcon * tcon,__u16 cmd,__u64 mid,__u64 persistent_fid,__u64 volatile_fid)757 __smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid,
758 __u64 persistent_fid, __u64 volatile_fid)
759 {
760 struct close_cancelled_open *cancelled;
761
762 cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC);
763 if (!cancelled)
764 return -ENOMEM;
765
766 cancelled->fid.persistent_fid = persistent_fid;
767 cancelled->fid.volatile_fid = volatile_fid;
768 cancelled->tcon = tcon;
769 cancelled->cmd = cmd;
770 cancelled->mid = mid;
771 INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
772 WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false);
773
774 return 0;
775 }
776
777 int
smb2_handle_cancelled_close(struct cifs_tcon * tcon,__u64 persistent_fid,__u64 volatile_fid)778 smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,
779 __u64 volatile_fid)
780 {
781 int rc;
782
783 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
784 spin_lock(&cifs_tcp_ses_lock);
785 if (tcon->tc_count <= 0) {
786 struct TCP_Server_Info *server = NULL;
787
788 WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative");
789 spin_unlock(&cifs_tcp_ses_lock);
790
791 if (tcon->ses)
792 server = tcon->ses->server;
793
794 cifs_server_dbg(FYI, "tid=%u: tcon is closing, skipping async close retry of fid %llu %llu\n",
795 tcon->tid, persistent_fid, volatile_fid);
796
797 return 0;
798 }
799 tcon->tc_count++;
800 spin_unlock(&cifs_tcp_ses_lock);
801
802 rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0,
803 persistent_fid, volatile_fid);
804 if (rc)
805 cifs_put_tcon(tcon);
806
807 return rc;
808 }
809
810 int
smb2_handle_cancelled_mid(struct mid_q_entry * mid,struct TCP_Server_Info * server)811 smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server)
812 {
813 struct smb2_sync_hdr *sync_hdr = mid->resp_buf;
814 struct smb2_create_rsp *rsp = mid->resp_buf;
815 struct cifs_tcon *tcon;
816 int rc;
817
818 if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || sync_hdr->Command != SMB2_CREATE ||
819 sync_hdr->Status != STATUS_SUCCESS)
820 return 0;
821
822 tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
823 sync_hdr->TreeId);
824 if (!tcon)
825 return -ENOENT;
826
827 rc = __smb2_handle_cancelled_cmd(tcon,
828 le16_to_cpu(sync_hdr->Command),
829 le64_to_cpu(sync_hdr->MessageId),
830 rsp->PersistentFileId,
831 rsp->VolatileFileId);
832 if (rc)
833 cifs_put_tcon(tcon);
834
835 return rc;
836 }
837
838 /**
839 * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
840 *
841 * Assumes @iov does not contain the rfc1002 length and iov[0] has the
842 * SMB2 header.
843 *
844 * @ses: server session structure
845 * @iov: array containing the SMB request we will send to the server
846 * @nvec: number of array entries for the iov
847 */
848 int
smb311_update_preauth_hash(struct cifs_ses * ses,struct kvec * iov,int nvec)849 smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
850 {
851 int i, rc;
852 struct sdesc *d;
853 struct smb2_sync_hdr *hdr;
854 struct TCP_Server_Info *server = cifs_ses_server(ses);
855
856 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
857 /* neg prot are always taken */
858 if (hdr->Command == SMB2_NEGOTIATE)
859 goto ok;
860
861 /*
862 * If we process a command which wasn't a negprot it means the
863 * neg prot was already done, so the server dialect was set
864 * and we can test it. Preauth requires 3.1.1 for now.
865 */
866 if (server->dialect != SMB311_PROT_ID)
867 return 0;
868
869 if (hdr->Command != SMB2_SESSION_SETUP)
870 return 0;
871
872 /* skip last sess setup response */
873 if ((hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
874 && (hdr->Status == NT_STATUS_OK
875 || (hdr->Status !=
876 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))))
877 return 0;
878
879 ok:
880 rc = smb311_crypto_shash_allocate(server);
881 if (rc)
882 return rc;
883
884 d = server->secmech.sdescsha512;
885 rc = crypto_shash_init(&d->shash);
886 if (rc) {
887 cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__);
888 return rc;
889 }
890
891 rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
892 SMB2_PREAUTH_HASH_SIZE);
893 if (rc) {
894 cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__);
895 return rc;
896 }
897
898 for (i = 0; i < nvec; i++) {
899 rc = crypto_shash_update(&d->shash,
900 iov[i].iov_base, iov[i].iov_len);
901 if (rc) {
902 cifs_dbg(VFS, "%s: Could not update sha512 shash\n",
903 __func__);
904 return rc;
905 }
906 }
907
908 rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
909 if (rc) {
910 cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n",
911 __func__);
912 return rc;
913 }
914
915 return 0;
916 }
917