s4:smb_server/smb2: don't reset highest_smb2_seqnum on SMB2 Cancel
[ira/wip.git] / source4 / smb_server / smb2 / receive.c
1 /* 
2    Unix SMB2 implementation.
3    
4    Copyright (C) Andrew Tridgell        2005
5    Copyright (C) Stefan Metzmacher      2005
6    
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 3 of the License, or
10    (at your option) any later version.
11    
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16    
17    You should have received a copy of the GNU General Public License
18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "system/time.h"
23 #include "libcli/smb2/smb2.h"
24 #include "libcli/smb2/smb2_calls.h"
25 #include "smb_server/smb_server.h"
26 #include "smb_server/smb2/smb2_server.h"
27 #include "smbd/service_stream.h"
28 #include "lib/stream/packet.h"
29 #include "ntvfs/ntvfs.h"
30 #include "param/param.h"
31 #include "auth/auth.h"
32
33
34 /* fill in the bufinfo */
35 void smb2srv_setup_bufinfo(struct smb2srv_request *req)
36 {
37         req->in.bufinfo.mem_ctx    = req;
38         req->in.bufinfo.flags      = BUFINFO_FLAG_UNICODE | BUFINFO_FLAG_SMB2;
39         req->in.bufinfo.align_base = req->in.buffer;
40         if (req->in.dynamic) {
41                 req->in.bufinfo.data       = req->in.dynamic;
42                 req->in.bufinfo.data_size  = req->in.body_size - req->in.body_fixed;
43         } else {
44                 req->in.bufinfo.data       = NULL;
45                 req->in.bufinfo.data_size  = 0;
46         }
47 }
48
49 static int smb2srv_request_destructor(struct smb2srv_request *req)
50 {
51         DLIST_REMOVE(req->smb_conn->requests2.list, req);
52         if (req->pending_id) {
53                 idr_remove(req->smb_conn->requests2.idtree_req, req->pending_id);
54         }
55         return 0;
56 }
57
58 static int smb2srv_request_deny_destructor(struct smb2srv_request *req)
59 {
60         return -1;
61 }
62
63 struct smb2srv_request *smb2srv_init_request(struct smbsrv_connection *smb_conn)
64 {
65         struct smb2srv_request *req;
66
67         req = talloc_zero(smb_conn, struct smb2srv_request);
68         if (!req) return NULL;
69
70         req->smb_conn = smb_conn;
71
72         talloc_set_destructor(req, smb2srv_request_destructor);
73
74         return req;
75 }
76
77 NTSTATUS smb2srv_setup_reply(struct smb2srv_request *req, uint16_t body_fixed_size,
78                              bool body_dynamic_present, uint32_t body_dynamic_size)
79 {
80         uint32_t flags = SMB2_HDR_FLAG_REDIRECT;
81         uint32_t pid = IVAL(req->in.hdr, SMB2_HDR_PID);
82         uint32_t tid = IVAL(req->in.hdr, SMB2_HDR_TID);
83
84         if (req->pending_id) {
85                 flags |= SMB2_HDR_FLAG_ASYNC;
86                 pid = req->pending_id;
87                 tid = 0;
88         }
89
90         if (body_dynamic_present) {
91                 if (body_dynamic_size == 0) {
92                         body_dynamic_size = 1;
93                 }
94         } else {
95                 body_dynamic_size = 0;
96         }
97
98         req->out.size           = SMB2_HDR_BODY+NBT_HDR_SIZE+body_fixed_size;
99
100         req->out.allocated      = req->out.size + body_dynamic_size;
101         req->out.buffer         = talloc_array(req, uint8_t, 
102                                                req->out.allocated);
103         NT_STATUS_HAVE_NO_MEMORY(req->out.buffer);
104
105         req->out.hdr            = req->out.buffer       + NBT_HDR_SIZE;
106         req->out.body           = req->out.hdr          + SMB2_HDR_BODY;
107         req->out.body_fixed     = body_fixed_size;
108         req->out.body_size      = body_fixed_size;
109         req->out.dynamic        = (body_dynamic_size ? req->out.body + body_fixed_size : NULL);
110
111         SIVAL(req->out.hdr, 0,                          SMB2_MAGIC);
112         SSVAL(req->out.hdr, SMB2_HDR_LENGTH,            SMB2_HDR_BODY);
113         SSVAL(req->out.hdr, SMB2_HDR_EPOCH,             0);
114         SIVAL(req->out.hdr, SMB2_HDR_STATUS,            NT_STATUS_V(req->status));
115         SSVAL(req->out.hdr, SMB2_HDR_OPCODE,            SVAL(req->in.hdr, SMB2_HDR_OPCODE));
116         SSVAL(req->out.hdr, SMB2_HDR_CREDIT,            0x0001);
117         SIVAL(req->out.hdr, SMB2_HDR_FLAGS,             flags);
118         SIVAL(req->out.hdr, SMB2_HDR_NEXT_COMMAND,      0);
119         SBVAL(req->out.hdr, SMB2_HDR_MESSAGE_ID,        req->seqnum);
120         SIVAL(req->out.hdr, SMB2_HDR_PID,               pid);
121         SIVAL(req->out.hdr, SMB2_HDR_TID,               tid);
122         SBVAL(req->out.hdr, SMB2_HDR_SESSION_ID,        BVAL(req->in.hdr, SMB2_HDR_SESSION_ID));
123         memset(req->out.hdr+SMB2_HDR_SIGNATURE, 0, 16);
124
125         /* set the length of the fixed body part and +1 if there's a dynamic part also */
126         SSVAL(req->out.body, 0, body_fixed_size + (body_dynamic_size?1:0));
127
128         /* 
129          * if we have a dynamic part, make sure the first byte
130          * which is always be part of the packet is initialized
131          */
132         if (body_dynamic_size) {
133                 req->out.size += 1;
134                 SCVAL(req->out.dynamic, 0, 0);
135         }
136
137         return NT_STATUS_OK;
138 }
139
140 static NTSTATUS smb2srv_reply(struct smb2srv_request *req);
141
142 static void smb2srv_chain_reply(struct smb2srv_request *p_req)
143 {
144         NTSTATUS status;
145         struct smb2srv_request *req;
146         uint32_t chain_offset;
147         uint32_t protocol_version;
148         uint16_t buffer_code;
149         uint32_t dynamic_size;
150         uint32_t flags;
151         uint32_t last_hdr_offset;
152
153         last_hdr_offset = p_req->in.hdr - p_req->in.buffer;
154
155         chain_offset = p_req->chain_offset;
156         p_req->chain_offset = 0;
157
158         if (p_req->in.size < (last_hdr_offset + chain_offset + SMB2_MIN_SIZE_NO_BODY)) {
159                 DEBUG(2,("Invalid SMB2 chained packet at offset 0x%X from last hdr 0x%X\n",
160                         chain_offset, last_hdr_offset));
161                 smbsrv_terminate_connection(p_req->smb_conn, "Invalid SMB2 chained packet");
162                 return;
163         }
164
165         protocol_version = IVAL(p_req->in.buffer, last_hdr_offset + chain_offset);
166         if (protocol_version != SMB2_MAGIC) {
167                 DEBUG(2,("Invalid SMB chained packet: protocol prefix: 0x%08X\n",
168                          protocol_version));
169                 smbsrv_terminate_connection(p_req->smb_conn, "NON-SMB2 chained packet");
170                 return;
171         }
172
173         req = smb2srv_init_request(p_req->smb_conn);
174         if (!req) {
175                 smbsrv_terminate_connection(p_req->smb_conn, "SMB2 chained packet - no memory");
176                 return;
177         }
178
179         req->in.buffer          = talloc_steal(req, p_req->in.buffer);
180         req->in.size            = p_req->in.size;
181         req->request_time       = p_req->request_time;
182         req->in.allocated       = req->in.size;
183
184         req->in.hdr             = req->in.buffer+ last_hdr_offset + chain_offset;
185         req->in.body            = req->in.hdr   + SMB2_HDR_BODY;
186         req->in.body_size       = req->in.size  - (last_hdr_offset+ chain_offset + SMB2_HDR_BODY);
187         req->in.dynamic         = NULL;
188
189         req->seqnum             = BVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID);
190
191         if (req->in.body_size < 2) {
192                 /* error handling for this is different for negprot to 
193                    other packet types */
194                 uint16_t opcode = SVAL(req->in.hdr, SMB2_HDR_OPCODE);
195                 if (opcode == SMB2_OP_NEGPROT) {
196                         smbsrv_terminate_connection(req->smb_conn, "Bad body size in SMB2 negprot");                    
197                 } else {
198                         smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER);
199                 }
200         }
201
202         buffer_code             = SVAL(req->in.body, 0);
203         req->in.body_fixed      = (buffer_code & ~1);
204         dynamic_size            = req->in.body_size - req->in.body_fixed;
205
206         if (dynamic_size != 0 && (buffer_code & 1)) {
207                 req->in.dynamic = req->in.body + req->in.body_fixed;
208                 if (smb2_oob(&req->in, req->in.dynamic, dynamic_size)) {
209                         DEBUG(1,("SMB2 chained request invalid dynamic size 0x%x\n", 
210                                  dynamic_size));
211                         smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER);
212                         return;
213                 }
214         }
215
216         smb2srv_setup_bufinfo(req);
217
218         flags = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
219         if (flags & SMB2_HDR_FLAG_CHAINED) {
220                 if (p_req->chained_file_handle) {
221                         memcpy(req->_chained_file_handle,
222                                p_req->_chained_file_handle,
223                                sizeof(req->_chained_file_handle));
224                         req->chained_file_handle = req->_chained_file_handle;
225                 }
226                 req->chain_status = p_req->chain_status;
227         }
228
229         /* 
230          * TODO: - make sure the length field is 64
231          *       - make sure it's a request
232          */
233
234         status = smb2srv_reply(req);
235         if (!NT_STATUS_IS_OK(status)) {
236                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
237                 talloc_free(req);
238                 return;
239         }
240 }
241
242 void smb2srv_send_reply(struct smb2srv_request *req)
243 {
244         DATA_BLOB blob;
245         NTSTATUS status;
246
247         if (req->smb_conn->connection->event.fde == NULL) {
248                 /* the socket has been destroyed - no point trying to send a reply! */
249                 talloc_free(req);
250                 return;
251         }
252
253         if (req->out.size > NBT_HDR_SIZE) {
254                 _smb2_setlen(req->out.buffer, req->out.size - NBT_HDR_SIZE);
255         }
256
257         /* if signing is active on the session then sign the packet */
258         if (req->is_signed) {
259                 status = smb2_sign_message(&req->out, 
260                                            req->session->session_info->session_key);
261                 if (!NT_STATUS_IS_OK(status)) {
262                         smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
263                         return;
264                 }               
265         }
266
267
268         blob = data_blob_const(req->out.buffer, req->out.size);
269         status = packet_send(req->smb_conn->packet, blob);
270         if (!NT_STATUS_IS_OK(status)) {
271                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
272         }
273         if (req->chain_offset) {
274                 smb2srv_chain_reply(req);
275                 return;
276         }
277         talloc_free(req);
278 }
279
280 void smb2srv_send_error(struct smb2srv_request *req, NTSTATUS error)
281 {
282         NTSTATUS status;
283
284         if (req->smb_conn->connection->event.fde == NULL) {
285                 /* the socket has been destroyed - no point trying to send an error! */
286                 talloc_free(req);
287                 return;
288         }
289
290         status = smb2srv_setup_reply(req, 8, true, 0);
291         if (!NT_STATUS_IS_OK(status)) {
292                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
293                 talloc_free(req);
294                 return;
295         }
296
297         SIVAL(req->out.hdr, SMB2_HDR_STATUS, NT_STATUS_V(error));
298
299         SSVAL(req->out.body, 0x02, 0);
300         SIVAL(req->out.body, 0x04, 0);
301
302         req->chain_status = NT_STATUS_INVALID_PARAMETER;
303
304         smb2srv_send_reply(req);
305 }
306
307 static NTSTATUS smb2srv_reply(struct smb2srv_request *req)
308 {
309         uint16_t opcode;
310         uint32_t tid;
311         uint64_t uid;
312         uint32_t flags;
313
314         if (SVAL(req->in.hdr, SMB2_HDR_LENGTH) != SMB2_HDR_BODY) {
315                 smbsrv_terminate_connection(req->smb_conn, "Invalid SMB2 header length");
316                 return NT_STATUS_INVALID_PARAMETER;
317         }
318         opcode                  = SVAL(req->in.hdr, SMB2_HDR_OPCODE);
319         req->chain_offset       = IVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND);
320         req->seqnum             = BVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID);
321         tid                     = IVAL(req->in.hdr, SMB2_HDR_TID);
322         uid                     = BVAL(req->in.hdr, SMB2_HDR_SESSION_ID);
323         flags                   = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
324
325         if (opcode != SMB2_OP_CANCEL &&
326             req->smb_conn->highest_smb2_seqnum != 0 &&
327             req->seqnum <= req->smb_conn->highest_smb2_seqnum) {
328                 smbsrv_terminate_connection(req->smb_conn, "Invalid SMB2 sequence number");
329                 return NT_STATUS_INVALID_PARAMETER;
330         }
331         if (opcode != SMB2_OP_CANCEL) {
332                 req->smb_conn->highest_smb2_seqnum = req->seqnum;
333         }
334
335         req->session    = smbsrv_session_find(req->smb_conn, uid, req->request_time);
336         req->tcon       = smbsrv_smb2_tcon_find(req->session, tid, req->request_time);
337
338         errno = 0;
339
340         /* supporting signing is mandatory in SMB2, and is per-packet. So we 
341            should check the signature on any incoming packet that is signed, and 
342            should give a signed reply to any signed request */
343         if (flags & SMB2_HDR_FLAG_SIGNED) {
344                 NTSTATUS status;
345
346                 if (!req->session) goto nosession;
347
348                 req->is_signed = true;
349                 status = smb2_check_signature(&req->in, 
350                                               req->session->session_info->session_key);
351                 if (!NT_STATUS_IS_OK(status)) {
352                         smb2srv_send_error(req, status);
353                         return NT_STATUS_OK;                    
354                 }
355         } else if (req->session && req->session->smb2_signing.active) {
356                 /* we require signing and this request was not signed */
357                 smb2srv_send_error(req, NT_STATUS_ACCESS_DENIED);
358                 return NT_STATUS_OK;                                    
359         }
360
361         if (!NT_STATUS_IS_OK(req->chain_status)) {
362                 smb2srv_send_error(req, req->chain_status);
363                 return NT_STATUS_OK;
364         }
365
366         switch (opcode) {
367         case SMB2_OP_NEGPROT:
368                 smb2srv_negprot_recv(req);
369                 return NT_STATUS_OK;
370         case SMB2_OP_SESSSETUP:
371                 smb2srv_sesssetup_recv(req);
372                 return NT_STATUS_OK;
373         case SMB2_OP_LOGOFF:
374                 if (!req->session) goto nosession;
375                 smb2srv_logoff_recv(req);
376                 return NT_STATUS_OK;
377         case SMB2_OP_TCON:
378                 if (!req->session) goto nosession;
379                 smb2srv_tcon_recv(req);
380                 return NT_STATUS_OK;
381         case SMB2_OP_TDIS:
382                 if (!req->session) goto nosession;
383                 if (!req->tcon) goto notcon;
384                 smb2srv_tdis_recv(req);
385                 return NT_STATUS_OK;
386         case SMB2_OP_CREATE:
387                 if (!req->session) goto nosession;
388                 if (!req->tcon) goto notcon;
389                 smb2srv_create_recv(req);
390                 return NT_STATUS_OK;
391         case SMB2_OP_CLOSE:
392                 if (!req->session) goto nosession;
393                 if (!req->tcon) goto notcon;
394                 smb2srv_close_recv(req);
395                 return NT_STATUS_OK;
396         case SMB2_OP_FLUSH:
397                 if (!req->session) goto nosession;
398                 if (!req->tcon) goto notcon;
399                 smb2srv_flush_recv(req);
400                 return NT_STATUS_OK;
401         case SMB2_OP_READ:
402                 if (!req->session) goto nosession;
403                 if (!req->tcon) goto notcon;
404                 smb2srv_read_recv(req);
405                 return NT_STATUS_OK;
406         case SMB2_OP_WRITE:
407                 if (!req->session) goto nosession;
408                 if (!req->tcon) goto notcon;
409                 smb2srv_write_recv(req);
410                 return NT_STATUS_OK;
411         case SMB2_OP_LOCK:
412                 if (!req->session) goto nosession;
413                 if (!req->tcon) goto notcon;
414                 smb2srv_lock_recv(req);
415                 return NT_STATUS_OK;
416         case SMB2_OP_IOCTL:
417                 if (!req->session) goto nosession;
418                 if (!req->tcon) goto notcon;
419                 smb2srv_ioctl_recv(req);
420                 return NT_STATUS_OK;
421         case SMB2_OP_CANCEL:
422                 smb2srv_cancel_recv(req);
423                 return NT_STATUS_OK;
424         case SMB2_OP_KEEPALIVE:
425                 smb2srv_keepalive_recv(req);
426                 return NT_STATUS_OK;
427         case SMB2_OP_FIND:
428                 if (!req->session) goto nosession;
429                 if (!req->tcon) goto notcon;
430                 smb2srv_find_recv(req);
431                 return NT_STATUS_OK;
432         case SMB2_OP_NOTIFY:
433                 if (!req->session) goto nosession;
434                 if (!req->tcon) goto notcon;
435                 smb2srv_notify_recv(req);
436                 return NT_STATUS_OK;
437         case SMB2_OP_GETINFO:
438                 if (!req->session) goto nosession;
439                 if (!req->tcon) goto notcon;
440                 smb2srv_getinfo_recv(req);
441                 return NT_STATUS_OK;
442         case SMB2_OP_SETINFO:
443                 if (!req->session) goto nosession;
444                 if (!req->tcon) goto notcon;
445                 smb2srv_setinfo_recv(req);
446                 return NT_STATUS_OK;
447         case SMB2_OP_BREAK:
448                 if (!req->session) goto nosession;
449                 if (!req->tcon) goto notcon;
450                 smb2srv_break_recv(req);
451                 return NT_STATUS_OK;
452         }
453
454         DEBUG(1,("Invalid SMB2 opcode: 0x%04X\n", opcode));
455         smbsrv_terminate_connection(req->smb_conn, "Invalid SMB2 opcode");
456         return NT_STATUS_OK;
457
458 nosession:
459         smb2srv_send_error(req, NT_STATUS_USER_SESSION_DELETED);
460         return NT_STATUS_OK;
461 notcon:
462         smb2srv_send_error(req, NT_STATUS_NETWORK_NAME_DELETED);
463         return NT_STATUS_OK;
464 }
465
466 NTSTATUS smbsrv_recv_smb2_request(void *private_data, DATA_BLOB blob)
467 {
468         struct smbsrv_connection *smb_conn = talloc_get_type(private_data, struct smbsrv_connection);
469         struct smb2srv_request *req;
470         struct timeval cur_time = timeval_current();
471         uint32_t protocol_version;
472         uint16_t buffer_code;
473         uint32_t dynamic_size;
474         uint32_t flags;
475
476         smb_conn->statistics.last_request_time = cur_time;
477
478         /* see if its a special NBT packet */
479         if (CVAL(blob.data,0) != 0) {
480                 DEBUG(2,("Special NBT packet on SMB2 connection"));
481                 smbsrv_terminate_connection(smb_conn, "Special NBT packet on SMB2 connection");
482                 return NT_STATUS_OK;
483         }
484
485         if (blob.length < (NBT_HDR_SIZE + SMB2_MIN_SIZE_NO_BODY)) {
486                 DEBUG(2,("Invalid SMB2 packet length count %ld\n", (long)blob.length));
487                 smbsrv_terminate_connection(smb_conn, "Invalid SMB2 packet");
488                 return NT_STATUS_OK;
489         }
490
491         protocol_version = IVAL(blob.data, NBT_HDR_SIZE);
492         if (protocol_version != SMB2_MAGIC) {
493                 DEBUG(2,("Invalid SMB packet: protocol prefix: 0x%08X\n",
494                          protocol_version));
495                 smbsrv_terminate_connection(smb_conn, "NON-SMB2 packet");
496                 return NT_STATUS_OK;
497         }
498
499         req = smb2srv_init_request(smb_conn);
500         NT_STATUS_HAVE_NO_MEMORY(req);
501
502         req->in.buffer          = talloc_steal(req, blob.data);
503         req->in.size            = blob.length;
504         req->request_time       = cur_time;
505         req->in.allocated       = req->in.size;
506
507         req->in.hdr             = req->in.buffer+ NBT_HDR_SIZE;
508         req->in.body            = req->in.hdr   + SMB2_HDR_BODY;
509         req->in.body_size       = req->in.size  - (SMB2_HDR_BODY+NBT_HDR_SIZE);
510         req->in.dynamic         = NULL;
511
512         req->seqnum             = BVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID);
513
514         if (req->in.body_size < 2) {
515                 /* error handling for this is different for negprot to 
516                    other packet types */
517                 uint16_t opcode = SVAL(req->in.hdr, SMB2_HDR_OPCODE);
518                 if (opcode == SMB2_OP_NEGPROT) {
519                         smbsrv_terminate_connection(req->smb_conn, "Bad body size in SMB2 negprot");                    
520                         return NT_STATUS_OK;
521                 } else {
522                         smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER);
523                         return NT_STATUS_OK;
524                 }
525         }
526
527         buffer_code             = SVAL(req->in.body, 0);
528         req->in.body_fixed      = (buffer_code & ~1);
529         dynamic_size            = req->in.body_size - req->in.body_fixed;
530
531         if (dynamic_size != 0 && (buffer_code & 1)) {
532                 req->in.dynamic = req->in.body + req->in.body_fixed;
533                 if (smb2_oob(&req->in, req->in.dynamic, dynamic_size)) {
534                         DEBUG(1,("SMB2 request invalid dynamic size 0x%x\n", 
535                                  dynamic_size));
536                         smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER);
537                         return NT_STATUS_OK;
538                 }
539         }
540
541         smb2srv_setup_bufinfo(req);
542
543         /* 
544          * TODO: - make sure the length field is 64
545          *       - make sure it's a request
546          */
547
548         flags = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
549         /* the first request should never have the related flag set */
550         if (flags & SMB2_HDR_FLAG_CHAINED) {
551                 req->chain_status = NT_STATUS_INVALID_PARAMETER;
552         }
553
554         return smb2srv_reply(req);
555 }
556
557 static NTSTATUS smb2srv_init_pending(struct smbsrv_connection *smb_conn)
558 {
559         smb_conn->requests2.idtree_req = idr_init(smb_conn);
560         NT_STATUS_HAVE_NO_MEMORY(smb_conn->requests2.idtree_req);
561         smb_conn->requests2.idtree_limit        = 0x00FFFFFF & (UINT32_MAX - 1);
562         smb_conn->requests2.list                = NULL;
563
564         return NT_STATUS_OK;
565 }
566
567 NTSTATUS smb2srv_queue_pending(struct smb2srv_request *req)
568 {
569         NTSTATUS status;
570         bool signing_used = false;
571         int id;
572
573         if (req->pending_id) {
574                 return NT_STATUS_INTERNAL_ERROR;
575         }
576
577         id = idr_get_new_above(req->smb_conn->requests2.idtree_req, req, 
578                                1, req->smb_conn->requests2.idtree_limit);
579         if (id == -1) {
580                 return NT_STATUS_INSUFFICIENT_RESOURCES;
581         }
582
583         DLIST_ADD_END(req->smb_conn->requests2.list, req, struct smb2srv_request *);
584         req->pending_id = id;
585
586         if (req->smb_conn->connection->event.fde == NULL) {
587                 /* the socket has been destroyed - no point trying to send an error! */
588                 return NT_STATUS_REMOTE_DISCONNECT;
589         }
590
591         talloc_set_destructor(req, smb2srv_request_deny_destructor);
592
593         status = smb2srv_setup_reply(req, 8, true, 0);
594         if (!NT_STATUS_IS_OK(status)) {
595                 return status;
596         }
597
598         SIVAL(req->out.hdr, SMB2_HDR_STATUS, NT_STATUS_V(STATUS_PENDING));
599
600         SSVAL(req->out.body, 0x02, 0);
601         SIVAL(req->out.body, 0x04, 0);
602
603         /* if the real reply will be signed set the signed flags, but don't sign */
604         if (req->is_signed) {
605                 SIVAL(req->out.hdr, SMB2_HDR_FLAGS, IVAL(req->out.hdr, SMB2_HDR_FLAGS) | SMB2_HDR_FLAG_SIGNED);
606                 signing_used = req->is_signed;
607                 req->is_signed = false;
608         }
609
610         smb2srv_send_reply(req);
611
612         req->is_signed = signing_used;
613
614         talloc_set_destructor(req, smb2srv_request_destructor);
615         return NT_STATUS_OK;
616 }
617
618 void smb2srv_cancel_recv(struct smb2srv_request *req)
619 {
620         uint32_t pending_id;
621         uint32_t flags;
622         void *p;
623         struct smb2srv_request *r;
624
625         if (!req->session) goto done;
626
627         flags           = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
628         pending_id      = IVAL(req->in.hdr, SMB2_HDR_PID);
629
630         if (!(flags & SMB2_HDR_FLAG_ASYNC)) {
631                 /* TODO: what to do here? */
632                 goto done;
633         }
634  
635         p = idr_find(req->smb_conn->requests2.idtree_req, pending_id);
636         if (!p) goto done;
637
638         r = talloc_get_type(p, struct smb2srv_request);
639         if (!r) goto done;
640
641         if (!r->ntvfs) goto done;
642
643         ntvfs_cancel(r->ntvfs);
644
645 done:
646         /* we never generate a reply for a SMB2 Cancel */
647         talloc_free(req);
648 }
649
650 /*
651  * init the SMB2 protocol related stuff
652  */
653 NTSTATUS smbsrv_init_smb2_connection(struct smbsrv_connection *smb_conn)
654 {
655         NTSTATUS status;
656
657         /* now initialise a few default values associated with this smb socket */
658         smb_conn->negotiate.max_send = 0xFFFF;
659
660         /* this is the size that w2k uses, and it appears to be important for
661            good performance */
662         smb_conn->negotiate.max_recv = lp_max_xmit(smb_conn->lp_ctx);
663
664         smb_conn->negotiate.zone_offset = get_time_zone(time(NULL));
665
666         smb_conn->config.security = SEC_USER;
667         smb_conn->config.nt_status_support = true;
668
669         status = smbsrv_init_sessions(smb_conn, UINT64_MAX);
670         NT_STATUS_NOT_OK_RETURN(status);
671
672         status = smb2srv_init_pending(smb_conn);
673         NT_STATUS_NOT_OK_RETURN(status);
674
675         return NT_STATUS_OK;
676         
677 }