smbXcli: add support for SMBreadBraw
[ira/wip.git] / libcli / smb / smbXcli_base.c
1 /*
2    Unix SMB/CIFS implementation.
3    Infrastructure for async SMB client requests
4    Copyright (C) Volker Lendecke 2008
5    Copyright (C) Stefan Metzmacher 2011
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/network.h"
23 #include "../lib/async_req/async_sock.h"
24 #include "../lib/util/tevent_ntstatus.h"
25 #include "../lib/util/tevent_unix.h"
26 #include "lib/util/util_net.h"
27 #include "lib/util/dlinklist.h"
28 #include "../libcli/smb/smb_common.h"
29 #include "../libcli/smb/smb_seal.h"
30 #include "../libcli/smb/smb_signing.h"
31 #include "../libcli/smb/read_smb.h"
32 #include "smbXcli_base.h"
33 #include "librpc/ndr/libndr.h"
34
35 struct smbXcli_conn;
36 struct smbXcli_req;
37 struct smbXcli_session;
38
39 struct smbXcli_conn {
40         int read_fd;
41         int write_fd;
42         struct sockaddr_storage local_ss;
43         struct sockaddr_storage remote_ss;
44         const char *remote_name;
45
46         struct tevent_queue *outgoing;
47         struct tevent_req **pending;
48         struct tevent_req *read_smb_req;
49
50         enum protocol_types protocol;
51         bool allow_signing;
52         bool desire_signing;
53         bool mandatory_signing;
54
55         /*
56          * The incoming dispatch function should return:
57          * - NT_STATUS_RETRY, if more incoming PDUs are expected.
58          * - NT_STATUS_OK, if no more processing is desired, e.g.
59          *                 the dispatch function called
60          *                 tevent_req_done().
61          * - All other return values disconnect the connection.
62          */
63         NTSTATUS (*dispatch_incoming)(struct smbXcli_conn *conn,
64                                       TALLOC_CTX *tmp_mem,
65                                       uint8_t *inbuf);
66
67         struct {
68                 struct {
69                         uint32_t capabilities;
70                         uint32_t max_xmit;
71                 } client;
72
73                 struct {
74                         uint32_t capabilities;
75                         uint32_t max_xmit;
76                         uint16_t max_mux;
77                         uint16_t security_mode;
78                         bool readbraw;
79                         bool writebraw;
80                         bool lockread;
81                         bool writeunlock;
82                         uint32_t session_key;
83                         struct GUID guid;
84                         DATA_BLOB gss_blob;
85                         uint8_t challenge[8];
86                         const char *workgroup;
87                         const char *name;
88                         int time_zone;
89                         NTTIME system_time;
90                 } server;
91
92                 uint32_t capabilities;
93                 uint32_t max_xmit;
94
95                 uint16_t mid;
96
97                 struct smb_signing_state *signing;
98                 struct smb_trans_enc_state *trans_enc;
99
100                 struct tevent_req *read_braw_req;
101         } smb1;
102
103         struct {
104                 struct {
105                         uint16_t security_mode;
106                         struct GUID guid;
107                 } client;
108
109                 struct {
110                         uint32_t capabilities;
111                         uint16_t security_mode;
112                         struct GUID guid;
113                         uint32_t max_trans_size;
114                         uint32_t max_read_size;
115                         uint32_t max_write_size;
116                         NTTIME system_time;
117                         NTTIME start_time;
118                         DATA_BLOB gss_blob;
119                 } server;
120
121                 uint64_t mid;
122                 uint16_t cur_credits;
123                 uint16_t max_credits;
124         } smb2;
125
126         struct smbXcli_session *sessions;
127 };
128
129 struct smbXcli_session {
130         struct smbXcli_session *prev, *next;
131         struct smbXcli_conn *conn;
132
133         struct {
134                 uint64_t session_id;
135                 uint16_t session_flags;
136                 DATA_BLOB signing_key;
137                 DATA_BLOB session_key;
138                 bool should_sign;
139                 bool channel_setup;
140         } smb2;
141 };
142
143 struct smbXcli_req_state {
144         struct tevent_context *ev;
145         struct smbXcli_conn *conn;
146         struct smbXcli_session *session; /* maybe NULL */
147
148         uint8_t length_hdr[4];
149
150         bool one_way;
151
152         uint8_t *inbuf;
153
154         struct {
155                 /* Space for the header including the wct */
156                 uint8_t hdr[HDR_VWV];
157
158                 /*
159                  * For normal requests, smb1cli_req_send chooses a mid.
160                  * SecondaryV trans requests need to use the mid of the primary
161                  * request, so we need a place to store it.
162                  * Assume it is set if != 0.
163                  */
164                 uint16_t mid;
165
166                 uint16_t *vwv;
167                 uint8_t bytecount_buf[2];
168
169 #define MAX_SMB_IOV 10
170                 /* length_hdr, hdr, words, byte_count, buffers */
171                 struct iovec iov[1 + 3 + MAX_SMB_IOV];
172                 int iov_count;
173
174                 bool one_way_seqnum;
175                 uint32_t seqnum;
176                 struct tevent_req **chained_requests;
177
178                 uint8_t recv_cmd;
179                 NTSTATUS recv_status;
180                 /* always an array of 3 talloc elements */
181                 struct iovec *recv_iov;
182         } smb1;
183
184         struct {
185                 const uint8_t *fixed;
186                 uint16_t fixed_len;
187                 const uint8_t *dyn;
188                 uint32_t dyn_len;
189
190                 uint8_t hdr[64];
191                 uint8_t pad[7]; /* padding space for compounding */
192
193                 /* always an array of 3 talloc elements */
194                 struct iovec *recv_iov;
195
196                 uint16_t credit_charge;
197
198                 bool signing_skipped;
199                 bool notify_async;
200                 bool got_async;
201         } smb2;
202 };
203
204 static int smbXcli_conn_destructor(struct smbXcli_conn *conn)
205 {
206         /*
207          * NT_STATUS_OK, means we do not notify the callers
208          */
209         smbXcli_conn_disconnect(conn, NT_STATUS_OK);
210
211         while (conn->sessions) {
212                 conn->sessions->conn = NULL;
213                 DLIST_REMOVE(conn->sessions, conn->sessions);
214         }
215
216         if (conn->smb1.trans_enc) {
217                 common_free_encryption_state(&conn->smb1.trans_enc);
218         }
219
220         return 0;
221 }
222
223 struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
224                                          int fd,
225                                          const char *remote_name,
226                                          enum smb_signing_setting signing_state,
227                                          uint32_t smb1_capabilities,
228                                          struct GUID *client_guid)
229 {
230         struct smbXcli_conn *conn = NULL;
231         void *ss = NULL;
232         struct sockaddr *sa = NULL;
233         socklen_t sa_length;
234         int ret;
235
236         conn = talloc_zero(mem_ctx, struct smbXcli_conn);
237         if (!conn) {
238                 return NULL;
239         }
240
241         conn->read_fd = fd;
242         conn->write_fd = dup(fd);
243         if (conn->write_fd == -1) {
244                 goto error;
245         }
246
247         conn->remote_name = talloc_strdup(conn, remote_name);
248         if (conn->remote_name == NULL) {
249                 goto error;
250         }
251
252
253         ss = (void *)&conn->local_ss;
254         sa = (struct sockaddr *)ss;
255         sa_length = sizeof(conn->local_ss);
256         ret = getsockname(fd, sa, &sa_length);
257         if (ret == -1) {
258                 goto error;
259         }
260         ss = (void *)&conn->remote_ss;
261         sa = (struct sockaddr *)ss;
262         sa_length = sizeof(conn->remote_ss);
263         ret = getpeername(fd, sa, &sa_length);
264         if (ret == -1) {
265                 goto error;
266         }
267
268         conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing");
269         if (conn->outgoing == NULL) {
270                 goto error;
271         }
272         conn->pending = NULL;
273
274         conn->protocol = PROTOCOL_NONE;
275
276         switch (signing_state) {
277         case SMB_SIGNING_OFF:
278                 /* never */
279                 conn->allow_signing = false;
280                 conn->desire_signing = false;
281                 conn->mandatory_signing = false;
282                 break;
283         case SMB_SIGNING_DEFAULT:
284         case SMB_SIGNING_IF_REQUIRED:
285                 /* if the server requires it */
286                 conn->allow_signing = true;
287                 conn->desire_signing = false;
288                 conn->mandatory_signing = false;
289                 break;
290         case SMB_SIGNING_REQUIRED:
291                 /* always */
292                 conn->allow_signing = true;
293                 conn->desire_signing = true;
294                 conn->mandatory_signing = true;
295                 break;
296         }
297
298         conn->smb1.client.capabilities = smb1_capabilities;
299         conn->smb1.client.max_xmit = UINT16_MAX;
300
301         conn->smb1.capabilities = conn->smb1.client.capabilities;
302         conn->smb1.max_xmit = 1024;
303
304         conn->smb1.mid = 1;
305
306         /* initialise signing */
307         conn->smb1.signing = smb_signing_init(conn,
308                                               conn->allow_signing,
309                                               conn->desire_signing,
310                                               conn->mandatory_signing);
311         if (!conn->smb1.signing) {
312                 goto error;
313         }
314
315         conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
316         if (conn->mandatory_signing) {
317                 conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
318         }
319         if (client_guid) {
320                 conn->smb2.client.guid = *client_guid;
321         }
322
323         conn->smb2.cur_credits = 1;
324         conn->smb2.max_credits = 0;
325
326         talloc_set_destructor(conn, smbXcli_conn_destructor);
327         return conn;
328
329  error:
330         if (conn->write_fd != -1) {
331                 close(conn->write_fd);
332         }
333         TALLOC_FREE(conn);
334         return NULL;
335 }
336
337 bool smbXcli_conn_is_connected(struct smbXcli_conn *conn)
338 {
339         if (conn == NULL) {
340                 return false;
341         }
342
343         if (conn->read_fd == -1) {
344                 return false;
345         }
346
347         return true;
348 }
349
350 enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn)
351 {
352         return conn->protocol;
353 }
354
355 bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
356 {
357         if (conn->protocol >= PROTOCOL_SMB2_02) {
358                 return true;
359         }
360
361         if (conn->smb1.capabilities & CAP_UNICODE) {
362                 return true;
363         }
364
365         return false;
366 }
367
368 void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
369 {
370         set_socket_options(conn->read_fd, options);
371 }
372
373 const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn)
374 {
375         return &conn->local_ss;
376 }
377
378 const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn)
379 {
380         return &conn->remote_ss;
381 }
382
383 const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn)
384 {
385         return conn->remote_name;
386 }
387
388 uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn)
389 {
390         if (conn->protocol >= PROTOCOL_SMB2_02) {
391                 /*
392                  * TODO...
393                  */
394                 return 1;
395         }
396
397         return conn->smb1.server.max_mux;
398 }
399
400 NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn)
401 {
402         if (conn->protocol >= PROTOCOL_SMB2_02) {
403                 return conn->smb2.server.system_time;
404         }
405
406         return conn->smb1.server.system_time;
407 }
408
409 const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn)
410 {
411         if (conn->protocol >= PROTOCOL_SMB2_02) {
412                 return &conn->smb2.server.gss_blob;
413         }
414
415         return &conn->smb1.server.gss_blob;
416 }
417
418 const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn)
419 {
420         if (conn->protocol >= PROTOCOL_SMB2_02) {
421                 return &conn->smb2.server.guid;
422         }
423
424         return &conn->smb1.server.guid;
425 }
426
427 uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn)
428 {
429         return conn->smb1.capabilities;
430 }
431
432 uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn)
433 {
434         return conn->smb1.max_xmit;
435 }
436
437 uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn)
438 {
439         return conn->smb1.server.session_key;
440 }
441
442 const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn)
443 {
444         return conn->smb1.server.challenge;
445 }
446
447 uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn)
448 {
449         return conn->smb1.server.security_mode;
450 }
451
452 bool smb1cli_conn_server_readbraw(struct smbXcli_conn *conn)
453 {
454         return conn->smb1.server.readbraw;
455 }
456
457 bool smb1cli_conn_server_writebraw(struct smbXcli_conn *conn)
458 {
459         return conn->smb1.server.writebraw;
460 }
461
462 bool smb1cli_conn_server_lockread(struct smbXcli_conn *conn)
463 {
464         return conn->smb1.server.lockread;
465 }
466
467 bool smb1cli_conn_server_writeunlock(struct smbXcli_conn *conn)
468 {
469         return conn->smb1.server.writeunlock;
470 }
471
472 int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn)
473 {
474         return conn->smb1.server.time_zone;
475 }
476
477 bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
478                                    const DATA_BLOB user_session_key,
479                                    const DATA_BLOB response)
480 {
481         return smb_signing_activate(conn->smb1.signing,
482                                     user_session_key,
483                                     response);
484 }
485
486 bool smb1cli_conn_check_signing(struct smbXcli_conn *conn,
487                                 const uint8_t *buf, uint32_t seqnum)
488 {
489         return smb_signing_check_pdu(conn->smb1.signing, buf, seqnum);
490 }
491
492 bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn)
493 {
494         return smb_signing_is_active(conn->smb1.signing);
495 }
496
497 void smb1cli_conn_set_encryption(struct smbXcli_conn *conn,
498                                  struct smb_trans_enc_state *es)
499 {
500         /* Replace the old state, if any. */
501         if (conn->smb1.trans_enc) {
502                 common_free_encryption_state(&conn->smb1.trans_enc);
503         }
504         conn->smb1.trans_enc = es;
505 }
506
507 bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn)
508 {
509         return common_encryption_on(conn->smb1.trans_enc);
510 }
511
512
513 static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr)
514 {
515         uint32_t flags2 = SVAL(hdr, HDR_FLG2);
516         NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS));
517
518         if (NT_STATUS_IS_OK(status)) {
519                 return NT_STATUS_OK;
520         }
521
522         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
523                 return status;
524         }
525
526         return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR));
527 }
528
529 /**
530  * Is the SMB command able to hold an AND_X successor
531  * @param[in] cmd       The SMB command in question
532  * @retval Can we add a chained request after "cmd"?
533  */
534 bool smb1cli_is_andx_req(uint8_t cmd)
535 {
536         switch (cmd) {
537         case SMBtconX:
538         case SMBlockingX:
539         case SMBopenX:
540         case SMBreadX:
541         case SMBwriteX:
542         case SMBsesssetupX:
543         case SMBulogoffX:
544         case SMBntcreateX:
545                 return true;
546                 break;
547         default:
548                 break;
549         }
550
551         return false;
552 }
553
554 static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn)
555 {
556         size_t num_pending = talloc_array_length(conn->pending);
557         uint16_t result;
558
559         while (true) {
560                 size_t i;
561
562                 result = conn->smb1.mid++;
563                 if ((result == 0) || (result == 0xffff)) {
564                         continue;
565                 }
566
567                 for (i=0; i<num_pending; i++) {
568                         if (result == smb1cli_req_mid(conn->pending[i])) {
569                                 break;
570                         }
571                 }
572
573                 if (i == num_pending) {
574                         return result;
575                 }
576         }
577 }
578
579 void smbXcli_req_unset_pending(struct tevent_req *req)
580 {
581         struct smbXcli_req_state *state =
582                 tevent_req_data(req,
583                 struct smbXcli_req_state);
584         struct smbXcli_conn *conn = state->conn;
585         size_t num_pending = talloc_array_length(conn->pending);
586         size_t i;
587
588         if (state->smb1.mid != 0) {
589                 /*
590                  * This is a [nt]trans[2] request which waits
591                  * for more than one reply.
592                  */
593                 return;
594         }
595
596         talloc_set_destructor(req, NULL);
597
598         if (num_pending == 1) {
599                 /*
600                  * The pending read_smb tevent_req is a child of
601                  * conn->pending. So if nothing is pending anymore, we need to
602                  * delete the socket read fde.
603                  */
604                 TALLOC_FREE(conn->pending);
605                 conn->read_smb_req = NULL;
606                 return;
607         }
608
609         for (i=0; i<num_pending; i++) {
610                 if (req == conn->pending[i]) {
611                         break;
612                 }
613         }
614         if (i == num_pending) {
615                 /*
616                  * Something's seriously broken. Just returning here is the
617                  * right thing nevertheless, the point of this routine is to
618                  * remove ourselves from conn->pending.
619                  */
620                 return;
621         }
622
623         /*
624          * Remove ourselves from the conn->pending array
625          */
626         for (; i < (num_pending - 1); i++) {
627                 conn->pending[i] = conn->pending[i+1];
628         }
629
630         /*
631          * No NULL check here, we're shrinking by sizeof(void *), and
632          * talloc_realloc just adjusts the size for this.
633          */
634         conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *,
635                                        num_pending - 1);
636         return;
637 }
638
639 static int smbXcli_req_destructor(struct tevent_req *req)
640 {
641         struct smbXcli_req_state *state =
642                 tevent_req_data(req,
643                 struct smbXcli_req_state);
644
645         /*
646          * Make sure we really remove it from
647          * the pending array on destruction.
648          */
649         state->smb1.mid = 0;
650         smbXcli_req_unset_pending(req);
651         return 0;
652 }
653
654 static bool smb1cli_req_cancel(struct tevent_req *req);
655 static bool smb2cli_req_cancel(struct tevent_req *req);
656
657 static bool smbXcli_req_cancel(struct tevent_req *req)
658 {
659         struct smbXcli_req_state *state =
660                 tevent_req_data(req,
661                 struct smbXcli_req_state);
662
663         if (!smbXcli_conn_is_connected(state->conn)) {
664                 return false;
665         }
666
667         if (state->conn->protocol == PROTOCOL_NONE) {
668                 return false;
669         }
670
671         if (state->conn->protocol >= PROTOCOL_SMB2_02) {
672                 return smb2cli_req_cancel(req);
673         }
674
675         return smb1cli_req_cancel(req);
676 }
677
678 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn);
679
680 bool smbXcli_req_set_pending(struct tevent_req *req)
681 {
682         struct smbXcli_req_state *state =
683                 tevent_req_data(req,
684                 struct smbXcli_req_state);
685         struct smbXcli_conn *conn;
686         struct tevent_req **pending;
687         size_t num_pending;
688
689         conn = state->conn;
690
691         if (!smbXcli_conn_is_connected(conn)) {
692                 return false;
693         }
694
695         num_pending = talloc_array_length(conn->pending);
696
697         pending = talloc_realloc(conn, conn->pending, struct tevent_req *,
698                                  num_pending+1);
699         if (pending == NULL) {
700                 return false;
701         }
702         pending[num_pending] = req;
703         conn->pending = pending;
704         talloc_set_destructor(req, smbXcli_req_destructor);
705         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
706
707         if (!smbXcli_conn_receive_next(conn)) {
708                 /*
709                  * the caller should notify the current request
710                  *
711                  * And all other pending requests get notified
712                  * by smbXcli_conn_disconnect().
713                  */
714                 smbXcli_req_unset_pending(req);
715                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
716                 return false;
717         }
718
719         return true;
720 }
721
722 static void smbXcli_conn_received(struct tevent_req *subreq);
723
724 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn)
725 {
726         size_t num_pending = talloc_array_length(conn->pending);
727         struct tevent_req *req;
728         struct smbXcli_req_state *state;
729
730         if (conn->read_smb_req != NULL) {
731                 return true;
732         }
733
734         if (num_pending == 0) {
735                 if (conn->smb2.mid < UINT64_MAX) {
736                         /* no more pending requests, so we are done for now */
737                         return true;
738                 }
739
740                 /*
741                  * If there are no more SMB2 requests possible,
742                  * because we are out of message ids,
743                  * we need to disconnect.
744                  */
745                 smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED);
746                 return true;
747         }
748
749         req = conn->pending[0];
750         state = tevent_req_data(req, struct smbXcli_req_state);
751
752         /*
753          * We're the first ones, add the read_smb request that waits for the
754          * answer from the server
755          */
756         conn->read_smb_req = read_smb_send(conn->pending,
757                                            state->ev,
758                                            conn->read_fd);
759         if (conn->read_smb_req == NULL) {
760                 return false;
761         }
762         tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn);
763         return true;
764 }
765
766 void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status)
767 {
768         tevent_queue_stop(conn->outgoing);
769
770         if (conn->read_fd != -1) {
771                 close(conn->read_fd);
772         }
773         if (conn->write_fd != -1) {
774                 close(conn->write_fd);
775         }
776         conn->read_fd = -1;
777         conn->write_fd = -1;
778
779         /*
780          * Cancel all pending requests. We do not do a for-loop walking
781          * conn->pending because that array changes in
782          * smbXcli_req_unset_pending.
783          */
784         while (talloc_array_length(conn->pending) > 0) {
785                 struct tevent_req *req;
786                 struct smbXcli_req_state *state;
787                 struct tevent_req **chain;
788                 size_t num_chained;
789                 size_t i;
790
791                 req = conn->pending[0];
792                 state = tevent_req_data(req, struct smbXcli_req_state);
793
794                 if (state->smb1.chained_requests == NULL) {
795                         /*
796                          * We're dead. No point waiting for trans2
797                          * replies.
798                          */
799                         state->smb1.mid = 0;
800
801                         smbXcli_req_unset_pending(req);
802
803                         if (NT_STATUS_IS_OK(status)) {
804                                 /* do not notify the callers */
805                                 continue;
806                         }
807
808                         /*
809                          * we need to defer the callback, because we may notify
810                          * more then one caller.
811                          */
812                         tevent_req_defer_callback(req, state->ev);
813                         tevent_req_nterror(req, status);
814                         continue;
815                 }
816
817                 chain = talloc_move(conn, &state->smb1.chained_requests);
818                 num_chained = talloc_array_length(chain);
819
820                 for (i=0; i<num_chained; i++) {
821                         req = chain[i];
822                         state = tevent_req_data(req, struct smbXcli_req_state);
823
824                         /*
825                          * We're dead. No point waiting for trans2
826                          * replies.
827                          */
828                         state->smb1.mid = 0;
829
830                         smbXcli_req_unset_pending(req);
831
832                         if (NT_STATUS_IS_OK(status)) {
833                                 /* do not notify the callers */
834                                 continue;
835                         }
836
837                         /*
838                          * we need to defer the callback, because we may notify
839                          * more than one caller.
840                          */
841                         tevent_req_defer_callback(req, state->ev);
842                         tevent_req_nterror(req, status);
843                 }
844                 TALLOC_FREE(chain);
845         }
846 }
847
848 /*
849  * Fetch a smb request's mid. Only valid after the request has been sent by
850  * smb1cli_req_send().
851  */
852 uint16_t smb1cli_req_mid(struct tevent_req *req)
853 {
854         struct smbXcli_req_state *state =
855                 tevent_req_data(req,
856                 struct smbXcli_req_state);
857
858         if (state->smb1.mid != 0) {
859                 return state->smb1.mid;
860         }
861
862         return SVAL(state->smb1.hdr, HDR_MID);
863 }
864
865 void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid)
866 {
867         struct smbXcli_req_state *state =
868                 tevent_req_data(req,
869                 struct smbXcli_req_state);
870
871         state->smb1.mid = mid;
872 }
873
874 uint32_t smb1cli_req_seqnum(struct tevent_req *req)
875 {
876         struct smbXcli_req_state *state =
877                 tevent_req_data(req,
878                 struct smbXcli_req_state);
879
880         return state->smb1.seqnum;
881 }
882
883 void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
884 {
885         struct smbXcli_req_state *state =
886                 tevent_req_data(req,
887                 struct smbXcli_req_state);
888
889         state->smb1.seqnum = seqnum;
890 }
891
892 static size_t smbXcli_iov_len(const struct iovec *iov, int count)
893 {
894         size_t result = 0;
895         int i;
896         for (i=0; i<count; i++) {
897                 result += iov[i].iov_len;
898         }
899         return result;
900 }
901
902 static uint8_t *smbXcli_iov_concat(TALLOC_CTX *mem_ctx,
903                                    const struct iovec *iov,
904                                    int count)
905 {
906         size_t len = smbXcli_iov_len(iov, count);
907         size_t copied;
908         uint8_t *buf;
909         int i;
910
911         buf = talloc_array(mem_ctx, uint8_t, len);
912         if (buf == NULL) {
913                 return NULL;
914         }
915         copied = 0;
916         for (i=0; i<count; i++) {
917                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
918                 copied += iov[i].iov_len;
919         }
920         return buf;
921 }
922
923 static void smb1cli_req_flags(enum protocol_types protocol,
924                               uint32_t smb1_capabilities,
925                               uint8_t smb_command,
926                               uint8_t additional_flags,
927                               uint8_t clear_flags,
928                               uint8_t *_flags,
929                               uint16_t additional_flags2,
930                               uint16_t clear_flags2,
931                               uint16_t *_flags2)
932 {
933         uint8_t flags = 0;
934         uint16_t flags2 = 0;
935
936         if (protocol >= PROTOCOL_LANMAN1) {
937                 flags |= FLAG_CASELESS_PATHNAMES;
938                 flags |= FLAG_CANONICAL_PATHNAMES;
939         }
940
941         if (protocol >= PROTOCOL_LANMAN2) {
942                 flags2 |= FLAGS2_LONG_PATH_COMPONENTS;
943                 flags2 |= FLAGS2_EXTENDED_ATTRIBUTES;
944         }
945
946         if (protocol >= PROTOCOL_NT1) {
947                 flags2 |= FLAGS2_IS_LONG_NAME;
948
949                 if (smb1_capabilities & CAP_UNICODE) {
950                         flags2 |= FLAGS2_UNICODE_STRINGS;
951                 }
952                 if (smb1_capabilities & CAP_STATUS32) {
953                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
954                 }
955                 if (smb1_capabilities & CAP_EXTENDED_SECURITY) {
956                         flags2 |= FLAGS2_EXTENDED_SECURITY;
957                 }
958         }
959
960         flags |= additional_flags;
961         flags &= ~clear_flags;
962         flags2 |= additional_flags2;
963         flags2 &= ~clear_flags2;
964
965         *_flags = flags;
966         *_flags2 = flags2;
967 }
968
969 static void smb1cli_req_cancel_done(struct tevent_req *subreq);
970
971 static bool smb1cli_req_cancel(struct tevent_req *req)
972 {
973         struct smbXcli_req_state *state =
974                 tevent_req_data(req,
975                 struct smbXcli_req_state);
976         uint8_t flags;
977         uint16_t flags2;
978         uint32_t pid;
979         uint16_t tid;
980         uint16_t uid;
981         uint16_t mid;
982         struct tevent_req *subreq;
983         NTSTATUS status;
984
985         flags = CVAL(state->smb1.hdr, HDR_FLG);
986         flags2 = SVAL(state->smb1.hdr, HDR_FLG2);
987         pid  = SVAL(state->smb1.hdr, HDR_PID);
988         pid |= SVAL(state->smb1.hdr, HDR_PIDHIGH)<<16;
989         tid = SVAL(state->smb1.hdr, HDR_TID);
990         uid = SVAL(state->smb1.hdr, HDR_UID);
991         mid = SVAL(state->smb1.hdr, HDR_MID);
992
993         subreq = smb1cli_req_create(state, state->ev,
994                                     state->conn,
995                                     SMBntcancel,
996                                     flags, 0,
997                                     flags2, 0,
998                                     0, /* timeout */
999                                     pid, tid, uid,
1000                                     0, NULL, /* vwv */
1001                                     0, NULL); /* bytes */
1002         if (subreq == NULL) {
1003                 return false;
1004         }
1005         smb1cli_req_set_mid(subreq, mid);
1006
1007         status = smb1cli_req_chain_submit(&subreq, 1);
1008         if (!NT_STATUS_IS_OK(status)) {
1009                 TALLOC_FREE(subreq);
1010                 return false;
1011         }
1012         smb1cli_req_set_mid(subreq, 0);
1013
1014         tevent_req_set_callback(subreq, smb1cli_req_cancel_done, NULL);
1015
1016         return true;
1017 }
1018
1019 static void smb1cli_req_cancel_done(struct tevent_req *subreq)
1020 {
1021         /* we do not care about the result */
1022         TALLOC_FREE(subreq);
1023 }
1024
1025 struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx,
1026                                       struct tevent_context *ev,
1027                                       struct smbXcli_conn *conn,
1028                                       uint8_t smb_command,
1029                                       uint8_t additional_flags,
1030                                       uint8_t clear_flags,
1031                                       uint16_t additional_flags2,
1032                                       uint16_t clear_flags2,
1033                                       uint32_t timeout_msec,
1034                                       uint32_t pid,
1035                                       uint16_t tid,
1036                                       uint16_t uid,
1037                                       uint8_t wct, uint16_t *vwv,
1038                                       int iov_count,
1039                                       struct iovec *bytes_iov)
1040 {
1041         struct tevent_req *req;
1042         struct smbXcli_req_state *state;
1043         uint8_t flags = 0;
1044         uint16_t flags2 = 0;
1045
1046         if (iov_count > MAX_SMB_IOV) {
1047                 /*
1048                  * Should not happen :-)
1049                  */
1050                 return NULL;
1051         }
1052
1053         req = tevent_req_create(mem_ctx, &state,
1054                                 struct smbXcli_req_state);
1055         if (req == NULL) {
1056                 return NULL;
1057         }
1058         state->ev = ev;
1059         state->conn = conn;
1060
1061         state->smb1.recv_cmd = 0xFF;
1062         state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR;
1063         state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3);
1064         if (state->smb1.recv_iov == NULL) {
1065                 TALLOC_FREE(req);
1066                 return NULL;
1067         }
1068
1069         smb1cli_req_flags(conn->protocol,
1070                           conn->smb1.capabilities,
1071                           smb_command,
1072                           additional_flags,
1073                           clear_flags,
1074                           &flags,
1075                           additional_flags2,
1076                           clear_flags2,
1077                           &flags2);
1078
1079         SIVAL(state->smb1.hdr, 0,           SMB_MAGIC);
1080         SCVAL(state->smb1.hdr, HDR_COM,     smb_command);
1081         SIVAL(state->smb1.hdr, HDR_RCLS,    NT_STATUS_V(NT_STATUS_OK));
1082         SCVAL(state->smb1.hdr, HDR_FLG,     flags);
1083         SSVAL(state->smb1.hdr, HDR_FLG2,    flags2);
1084         SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16);
1085         SSVAL(state->smb1.hdr, HDR_TID,     tid);
1086         SSVAL(state->smb1.hdr, HDR_PID,     pid);
1087         SSVAL(state->smb1.hdr, HDR_UID,     uid);
1088         SSVAL(state->smb1.hdr, HDR_MID,     0); /* this comes later */
1089         SCVAL(state->smb1.hdr, HDR_WCT,     wct);
1090
1091         state->smb1.vwv = vwv;
1092
1093         SSVAL(state->smb1.bytecount_buf, 0, smbXcli_iov_len(bytes_iov, iov_count));
1094
1095         state->smb1.iov[0].iov_base = (void *)state->length_hdr;
1096         state->smb1.iov[0].iov_len  = sizeof(state->length_hdr);
1097         state->smb1.iov[1].iov_base = (void *)state->smb1.hdr;
1098         state->smb1.iov[1].iov_len  = sizeof(state->smb1.hdr);
1099         state->smb1.iov[2].iov_base = (void *)state->smb1.vwv;
1100         state->smb1.iov[2].iov_len  = wct * sizeof(uint16_t);
1101         state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf;
1102         state->smb1.iov[3].iov_len  = sizeof(uint16_t);
1103
1104         if (iov_count != 0) {
1105                 memcpy(&state->smb1.iov[4], bytes_iov,
1106                        iov_count * sizeof(*bytes_iov));
1107         }
1108         state->smb1.iov_count = iov_count + 4;
1109
1110         if (timeout_msec > 0) {
1111                 struct timeval endtime;
1112
1113                 endtime = timeval_current_ofs_msec(timeout_msec);
1114                 if (!tevent_req_set_endtime(req, ev, endtime)) {
1115                         return req;
1116                 }
1117         }
1118
1119         switch (smb_command) {
1120         case SMBtranss:
1121         case SMBtranss2:
1122         case SMBnttranss:
1123                 state->one_way = true;
1124                 break;
1125         case SMBntcancel:
1126                 state->one_way = true;
1127                 state->smb1.one_way_seqnum = true;
1128                 break;
1129         case SMBlockingX:
1130                 if ((wct == 8) &&
1131                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
1132                         state->one_way = true;
1133                 }
1134                 break;
1135         }
1136
1137         return req;
1138 }
1139
1140 static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn,
1141                                    struct iovec *iov, int iov_count,
1142                                    uint32_t *seqnum,
1143                                    bool one_way_seqnum)
1144 {
1145         TALLOC_CTX *frame = NULL;
1146         uint8_t *buf;
1147
1148         /*
1149          * Obvious optimization: Make cli_calculate_sign_mac work with struct
1150          * iovec directly. MD5Update would do that just fine.
1151          */
1152
1153         if (iov_count < 4) {
1154                 return NT_STATUS_INVALID_PARAMETER_MIX;
1155         }
1156         if (iov[0].iov_len != NBT_HDR_SIZE) {
1157                 return NT_STATUS_INVALID_PARAMETER_MIX;
1158         }
1159         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1160                 return NT_STATUS_INVALID_PARAMETER_MIX;
1161         }
1162         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1163                 return NT_STATUS_INVALID_PARAMETER_MIX;
1164         }
1165         if (iov[3].iov_len != sizeof(uint16_t)) {
1166                 return NT_STATUS_INVALID_PARAMETER_MIX;
1167         }
1168
1169         frame = talloc_stackframe();
1170
1171         buf = smbXcli_iov_concat(frame, iov, iov_count);
1172         if (buf == NULL) {
1173                 return NT_STATUS_NO_MEMORY;
1174         }
1175
1176         *seqnum = smb_signing_next_seqnum(conn->smb1.signing,
1177                                           one_way_seqnum);
1178         smb_signing_sign_pdu(conn->smb1.signing, buf, *seqnum);
1179         memcpy(iov[1].iov_base, buf+4, iov[1].iov_len);
1180
1181         TALLOC_FREE(frame);
1182         return NT_STATUS_OK;
1183 }
1184
1185 static void smb1cli_req_writev_done(struct tevent_req *subreq);
1186 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1187                                                TALLOC_CTX *tmp_mem,
1188                                                uint8_t *inbuf);
1189
1190 static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req,
1191                                           struct smbXcli_req_state *state,
1192                                           struct iovec *iov, int iov_count)
1193 {
1194         struct tevent_req *subreq;
1195         NTSTATUS status;
1196         uint8_t cmd;
1197         uint16_t mid;
1198
1199         if (!smbXcli_conn_is_connected(state->conn)) {
1200                 return NT_STATUS_CONNECTION_DISCONNECTED;
1201         }
1202
1203         if (state->conn->protocol > PROTOCOL_NT1) {
1204                 return NT_STATUS_REVISION_MISMATCH;
1205         }
1206
1207         if (iov_count < 4) {
1208                 return NT_STATUS_INVALID_PARAMETER_MIX;
1209         }
1210         if (iov[0].iov_len != NBT_HDR_SIZE) {
1211                 return NT_STATUS_INVALID_PARAMETER_MIX;
1212         }
1213         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1214                 return NT_STATUS_INVALID_PARAMETER_MIX;
1215         }
1216         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1217                 return NT_STATUS_INVALID_PARAMETER_MIX;
1218         }
1219         if (iov[3].iov_len != sizeof(uint16_t)) {
1220                 return NT_STATUS_INVALID_PARAMETER_MIX;
1221         }
1222
1223         cmd = CVAL(iov[1].iov_base, HDR_COM);
1224         if (cmd == SMBreadBraw) {
1225                 if (smbXcli_conn_has_async_calls(state->conn)) {
1226                         return NT_STATUS_INVALID_PARAMETER_MIX;
1227                 }
1228                 state->conn->smb1.read_braw_req = req;
1229         }
1230
1231         if (state->smb1.mid != 0) {
1232                 mid = state->smb1.mid;
1233         } else {
1234                 mid = smb1cli_alloc_mid(state->conn);
1235         }
1236         SSVAL(iov[1].iov_base, HDR_MID, mid);
1237
1238         _smb_setlen_nbt(iov[0].iov_base, smbXcli_iov_len(&iov[1], iov_count-1));
1239
1240         status = smb1cli_conn_signv(state->conn, iov, iov_count,
1241                                     &state->smb1.seqnum,
1242                                     state->smb1.one_way_seqnum);
1243
1244         if (!NT_STATUS_IS_OK(status)) {
1245                 return status;
1246         }
1247
1248         /*
1249          * If we supported multiple encrytion contexts
1250          * here we'd look up based on tid.
1251          */
1252         if (common_encryption_on(state->conn->smb1.trans_enc)) {
1253                 char *buf, *enc_buf;
1254
1255                 buf = (char *)smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1256                 if (buf == NULL) {
1257                         return NT_STATUS_NO_MEMORY;
1258                 }
1259                 status = common_encrypt_buffer(state->conn->smb1.trans_enc,
1260                                                (char *)buf, &enc_buf);
1261                 TALLOC_FREE(buf);
1262                 if (!NT_STATUS_IS_OK(status)) {
1263                         DEBUG(0, ("Error in encrypting client message: %s\n",
1264                                   nt_errstr(status)));
1265                         return status;
1266                 }
1267                 buf = (char *)talloc_memdup(state, enc_buf,
1268                                             smb_len_nbt(enc_buf)+4);
1269                 SAFE_FREE(enc_buf);
1270                 if (buf == NULL) {
1271                         return NT_STATUS_NO_MEMORY;
1272                 }
1273                 iov[0].iov_base = (void *)buf;
1274                 iov[0].iov_len = talloc_get_size(buf);
1275                 iov_count = 1;
1276         }
1277
1278         if (state->conn->dispatch_incoming == NULL) {
1279                 state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
1280         }
1281
1282         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
1283
1284         subreq = writev_send(state, state->ev, state->conn->outgoing,
1285                              state->conn->write_fd, false, iov, iov_count);
1286         if (subreq == NULL) {
1287                 return NT_STATUS_NO_MEMORY;
1288         }
1289         tevent_req_set_callback(subreq, smb1cli_req_writev_done, req);
1290         return NT_STATUS_OK;
1291 }
1292
1293 struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx,
1294                                     struct tevent_context *ev,
1295                                     struct smbXcli_conn *conn,
1296                                     uint8_t smb_command,
1297                                     uint8_t additional_flags,
1298                                     uint8_t clear_flags,
1299                                     uint16_t additional_flags2,
1300                                     uint16_t clear_flags2,
1301                                     uint32_t timeout_msec,
1302                                     uint32_t pid,
1303                                     uint16_t tid,
1304                                     uint16_t uid,
1305                                     uint8_t wct, uint16_t *vwv,
1306                                     uint32_t num_bytes,
1307                                     const uint8_t *bytes)
1308 {
1309         struct tevent_req *req;
1310         struct iovec iov;
1311         NTSTATUS status;
1312
1313         iov.iov_base = discard_const_p(void, bytes);
1314         iov.iov_len = num_bytes;
1315
1316         req = smb1cli_req_create(mem_ctx, ev, conn, smb_command,
1317                                  additional_flags, clear_flags,
1318                                  additional_flags2, clear_flags2,
1319                                  timeout_msec,
1320                                  pid, tid, uid,
1321                                  wct, vwv, 1, &iov);
1322         if (req == NULL) {
1323                 return NULL;
1324         }
1325         if (!tevent_req_is_in_progress(req)) {
1326                 return tevent_req_post(req, ev);
1327         }
1328         status = smb1cli_req_chain_submit(&req, 1);
1329         if (tevent_req_nterror(req, status)) {
1330                 return tevent_req_post(req, ev);
1331         }
1332         return req;
1333 }
1334
1335 static void smb1cli_req_writev_done(struct tevent_req *subreq)
1336 {
1337         struct tevent_req *req =
1338                 tevent_req_callback_data(subreq,
1339                 struct tevent_req);
1340         struct smbXcli_req_state *state =
1341                 tevent_req_data(req,
1342                 struct smbXcli_req_state);
1343         ssize_t nwritten;
1344         int err;
1345
1346         nwritten = writev_recv(subreq, &err);
1347         TALLOC_FREE(subreq);
1348         if (nwritten == -1) {
1349                 NTSTATUS status = map_nt_error_from_unix_common(err);
1350                 smbXcli_conn_disconnect(state->conn, status);
1351                 return;
1352         }
1353
1354         if (state->one_way) {
1355                 state->inbuf = NULL;
1356                 tevent_req_done(req);
1357                 return;
1358         }
1359
1360         if (!smbXcli_req_set_pending(req)) {
1361                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1362                 return;
1363         }
1364 }
1365
1366 static void smbXcli_conn_received(struct tevent_req *subreq)
1367 {
1368         struct smbXcli_conn *conn =
1369                 tevent_req_callback_data(subreq,
1370                 struct smbXcli_conn);
1371         TALLOC_CTX *frame = talloc_stackframe();
1372         NTSTATUS status;
1373         uint8_t *inbuf;
1374         ssize_t received;
1375         int err;
1376
1377         if (subreq != conn->read_smb_req) {
1378                 DEBUG(1, ("Internal error: cli_smb_received called with "
1379                           "unexpected subreq\n"));
1380                 status = NT_STATUS_INTERNAL_ERROR;
1381                 smbXcli_conn_disconnect(conn, status);
1382                 TALLOC_FREE(frame);
1383                 return;
1384         }
1385         conn->read_smb_req = NULL;
1386
1387         received = read_smb_recv(subreq, frame, &inbuf, &err);
1388         TALLOC_FREE(subreq);
1389         if (received == -1) {
1390                 status = map_nt_error_from_unix_common(err);
1391                 smbXcli_conn_disconnect(conn, status);
1392                 TALLOC_FREE(frame);
1393                 return;
1394         }
1395
1396         status = conn->dispatch_incoming(conn, frame, inbuf);
1397         TALLOC_FREE(frame);
1398         if (NT_STATUS_IS_OK(status)) {
1399                 /*
1400                  * We should not do any more processing
1401                  * as the dispatch function called
1402                  * tevent_req_done().
1403                  */
1404                 return;
1405         } else if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1406                 /*
1407                  * We got an error, so notify all pending requests
1408                  */
1409                 smbXcli_conn_disconnect(conn, status);
1410                 return;
1411         }
1412
1413         /*
1414          * We got NT_STATUS_RETRY, so we may ask for a
1415          * next incoming pdu.
1416          */
1417         if (!smbXcli_conn_receive_next(conn)) {
1418                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1419         }
1420 }
1421
1422 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1423                                           struct iovec **piov, int *pnum_iov)
1424 {
1425         struct iovec *iov;
1426         int num_iov;
1427         size_t buflen;
1428         size_t taken;
1429         size_t remaining;
1430         uint8_t *hdr;
1431         uint8_t cmd;
1432         uint32_t wct_ofs;
1433
1434         buflen = smb_len_nbt(buf);
1435         taken = 0;
1436
1437         hdr = buf + NBT_HDR_SIZE;
1438
1439         if (buflen < MIN_SMB_SIZE) {
1440                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1441         }
1442
1443         /*
1444          * This returns iovec elements in the following order:
1445          *
1446          * - SMB header
1447          *
1448          * - Parameter Block
1449          * - Data Block
1450          *
1451          * - Parameter Block
1452          * - Data Block
1453          *
1454          * - Parameter Block
1455          * - Data Block
1456          */
1457         num_iov = 1;
1458
1459         iov = talloc_array(mem_ctx, struct iovec, num_iov);
1460         if (iov == NULL) {
1461                 return NT_STATUS_NO_MEMORY;
1462         }
1463         iov[0].iov_base = hdr;
1464         iov[0].iov_len = HDR_WCT;
1465         taken += HDR_WCT;
1466
1467         cmd = CVAL(hdr, HDR_COM);
1468         wct_ofs = HDR_WCT;
1469
1470         while (true) {
1471                 size_t len = buflen - taken;
1472                 struct iovec *cur;
1473                 struct iovec *iov_tmp;
1474                 uint8_t wct;
1475                 uint32_t bcc_ofs;
1476                 uint16_t bcc;
1477                 size_t needed;
1478
1479                 /*
1480                  * we need at least WCT and BCC
1481                  */
1482                 needed = sizeof(uint8_t) + sizeof(uint16_t);
1483                 if (len < needed) {
1484                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1485                                    __location__, (int)len, (int)needed));
1486                         goto inval;
1487                 }
1488
1489                 /*
1490                  * Now we check if the specified words are there
1491                  */
1492                 wct = CVAL(hdr, wct_ofs);
1493                 needed += wct * sizeof(uint16_t);
1494                 if (len < needed) {
1495                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1496                                    __location__, (int)len, (int)needed));
1497                         goto inval;
1498                 }
1499
1500                 /*
1501                  * Now we check if the specified bytes are there
1502                  */
1503                 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
1504                 bcc = SVAL(hdr, bcc_ofs);
1505                 needed += bcc * sizeof(uint8_t);
1506                 if (len < needed) {
1507                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1508                                    __location__, (int)len, (int)needed));
1509                         goto inval;
1510                 }
1511
1512                 /*
1513                  * we allocate 2 iovec structures for words and bytes
1514                  */
1515                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1516                                          num_iov + 2);
1517                 if (iov_tmp == NULL) {
1518                         TALLOC_FREE(iov);
1519                         return NT_STATUS_NO_MEMORY;
1520                 }
1521                 iov = iov_tmp;
1522                 cur = &iov[num_iov];
1523                 num_iov += 2;
1524
1525                 cur[0].iov_len = wct * sizeof(uint16_t);
1526                 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1527                 cur[1].iov_len = bcc * sizeof(uint8_t);
1528                 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
1529
1530                 taken += needed;
1531
1532                 if (!smb1cli_is_andx_req(cmd)) {
1533                         /*
1534                          * If the current command does not have AndX chanining
1535                          * we are done.
1536                          */
1537                         break;
1538                 }
1539
1540                 if (wct == 0 && bcc == 0) {
1541                         /*
1542                          * An empty response also ends the chain,
1543                          * most likely with an error.
1544                          */
1545                         break;
1546                 }
1547
1548                 if (wct < 2) {
1549                         DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
1550                                    __location__, (int)wct, (int)cmd));
1551                         goto inval;
1552                 }
1553                 cmd = CVAL(cur[0].iov_base, 0);
1554                 if (cmd == 0xFF) {
1555                         /*
1556                          * If it is the end of the chain we are also done.
1557                          */
1558                         break;
1559                 }
1560                 wct_ofs = SVAL(cur[0].iov_base, 2);
1561
1562                 if (wct_ofs < taken) {
1563                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1564                 }
1565                 if (wct_ofs > buflen) {
1566                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1567                 }
1568
1569                 /*
1570                  * we consumed everything up to the start of the next
1571                  * parameter block.
1572                  */
1573                 taken = wct_ofs;
1574         }
1575
1576         remaining = buflen - taken;
1577
1578         if (remaining > 0 && num_iov >= 3) {
1579                 /*
1580                  * The last DATA block gets the remaining
1581                  * bytes, this is needed to support
1582                  * CAP_LARGE_WRITEX and CAP_LARGE_READX.
1583                  */
1584                 iov[num_iov-1].iov_len += remaining;
1585         }
1586
1587         *piov = iov;
1588         *pnum_iov = num_iov;
1589         return NT_STATUS_OK;
1590
1591 inval:
1592         TALLOC_FREE(iov);
1593         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1594 }
1595
1596 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1597                                                TALLOC_CTX *tmp_mem,
1598                                                uint8_t *inbuf)
1599 {
1600         struct tevent_req *req;
1601         struct smbXcli_req_state *state;
1602         NTSTATUS status;
1603         size_t num_pending;
1604         size_t i;
1605         uint8_t cmd;
1606         uint16_t mid;
1607         bool oplock_break;
1608         const uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
1609         struct iovec *iov = NULL;
1610         int num_iov = 0;
1611         struct tevent_req **chain = NULL;
1612         size_t num_chained = 0;
1613         size_t num_responses = 0;
1614
1615         if (conn->smb1.read_braw_req != NULL) {
1616                 req = conn->smb1.read_braw_req;
1617                 conn->smb1.read_braw_req = NULL;
1618                 state = tevent_req_data(req, struct smbXcli_req_state);
1619
1620                 smbXcli_req_unset_pending(req);
1621
1622                 if (state->smb1.recv_iov == NULL) {
1623                         /*
1624                          * For requests with more than
1625                          * one response, we have to readd the
1626                          * recv_iov array.
1627                          */
1628                         state->smb1.recv_iov = talloc_zero_array(state,
1629                                                                  struct iovec,
1630                                                                  3);
1631                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1632                                 return NT_STATUS_OK;
1633                         }
1634                 }
1635
1636                 state->smb1.recv_iov[0].iov_base = (void *)(inbuf + NBT_HDR_SIZE);
1637                 state->smb1.recv_iov[0].iov_len = smb_len_nbt(inbuf);
1638                 ZERO_STRUCT(state->smb1.recv_iov[1]);
1639                 ZERO_STRUCT(state->smb1.recv_iov[2]);
1640
1641                 state->smb1.recv_cmd = SMBreadBraw;
1642                 state->smb1.recv_status = NT_STATUS_OK;
1643                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1644
1645                 tevent_req_done(req);
1646                 return NT_STATUS_OK;
1647         }
1648
1649         if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
1650             && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
1651                 DEBUG(10, ("Got non-SMB PDU\n"));
1652                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1653         }
1654
1655         /*
1656          * If we supported multiple encrytion contexts
1657          * here we'd look up based on tid.
1658          */
1659         if (common_encryption_on(conn->smb1.trans_enc)
1660             && (CVAL(inbuf, 0) == 0)) {
1661                 uint16_t enc_ctx_num;
1662
1663                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
1664                 if (!NT_STATUS_IS_OK(status)) {
1665                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
1666                                    nt_errstr(status)));
1667                         return status;
1668                 }
1669
1670                 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
1671                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
1672                                    enc_ctx_num,
1673                                    conn->smb1.trans_enc->enc_ctx_num));
1674                         return NT_STATUS_INVALID_HANDLE;
1675                 }
1676
1677                 status = common_decrypt_buffer(conn->smb1.trans_enc,
1678                                                (char *)inbuf);
1679                 if (!NT_STATUS_IS_OK(status)) {
1680                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
1681                                    nt_errstr(status)));
1682                         return status;
1683                 }
1684         }
1685
1686         mid = SVAL(inhdr, HDR_MID);
1687         num_pending = talloc_array_length(conn->pending);
1688
1689         for (i=0; i<num_pending; i++) {
1690                 if (mid == smb1cli_req_mid(conn->pending[i])) {
1691                         break;
1692                 }
1693         }
1694         if (i == num_pending) {
1695                 /* Dump unexpected reply */
1696                 return NT_STATUS_RETRY;
1697         }
1698
1699         oplock_break = false;
1700
1701         if (mid == 0xffff) {
1702                 /*
1703                  * Paranoia checks that this is really an oplock break request.
1704                  */
1705                 oplock_break = (smb_len_nbt(inbuf) == 51); /* hdr + 8 words */
1706                 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
1707                 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
1708                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
1709                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
1710
1711                 if (!oplock_break) {
1712                         /* Dump unexpected reply */
1713                         return NT_STATUS_RETRY;
1714                 }
1715         }
1716
1717         req = conn->pending[i];
1718         state = tevent_req_data(req, struct smbXcli_req_state);
1719
1720         if (!oplock_break /* oplock breaks are not signed */
1721             && !smb_signing_check_pdu(conn->smb1.signing,
1722                                       inbuf, state->smb1.seqnum+1)) {
1723                 DEBUG(10, ("cli_check_sign_mac failed\n"));
1724                 return NT_STATUS_ACCESS_DENIED;
1725         }
1726
1727         status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
1728                                            &iov, &num_iov);
1729         if (!NT_STATUS_IS_OK(status)) {
1730                 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
1731                           nt_errstr(status)));
1732                 return status;
1733         }
1734
1735         cmd = CVAL(inhdr, HDR_COM);
1736         status = smb1cli_pull_raw_error(inhdr);
1737
1738         if (state->smb1.chained_requests == NULL) {
1739                 if (num_iov != 3) {
1740                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1741                 }
1742
1743                 smbXcli_req_unset_pending(req);
1744
1745                 if (state->smb1.recv_iov == NULL) {
1746                         /*
1747                          * For requests with more than
1748                          * one response, we have to readd the
1749                          * recv_iov array.
1750                          */
1751                         state->smb1.recv_iov = talloc_zero_array(state,
1752                                                                  struct iovec,
1753                                                                  3);
1754                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1755                                 return NT_STATUS_OK;
1756                         }
1757                 }
1758
1759                 state->smb1.recv_cmd = cmd;
1760                 state->smb1.recv_status = status;
1761                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1762
1763                 state->smb1.recv_iov[0] = iov[0];
1764                 state->smb1.recv_iov[1] = iov[1];
1765                 state->smb1.recv_iov[2] = iov[2];
1766
1767                 if (talloc_array_length(conn->pending) == 0) {
1768                         tevent_req_done(req);
1769                         return NT_STATUS_OK;
1770                 }
1771
1772                 tevent_req_defer_callback(req, state->ev);
1773                 tevent_req_done(req);
1774                 return NT_STATUS_RETRY;
1775         }
1776
1777         chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
1778         num_chained = talloc_array_length(chain);
1779         num_responses = (num_iov - 1)/2;
1780
1781         if (num_responses > num_chained) {
1782                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1783         }
1784
1785         for (i=0; i<num_chained; i++) {
1786                 size_t iov_idx = 1 + (i*2);
1787                 struct iovec *cur = &iov[iov_idx];
1788                 uint8_t *inbuf_ref;
1789
1790                 req = chain[i];
1791                 state = tevent_req_data(req, struct smbXcli_req_state);
1792
1793                 smbXcli_req_unset_pending(req);
1794
1795                 /*
1796                  * as we finish multiple requests here
1797                  * we need to defer the callbacks as
1798                  * they could destroy our current stack state.
1799                  */
1800                 tevent_req_defer_callback(req, state->ev);
1801
1802                 if (i >= num_responses) {
1803                         tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
1804                         continue;
1805                 }
1806
1807                 if (state->smb1.recv_iov == NULL) {
1808                         /*
1809                          * For requests with more than
1810                          * one response, we have to readd the
1811                          * recv_iov array.
1812                          */
1813                         state->smb1.recv_iov = talloc_zero_array(state,
1814                                                                  struct iovec,
1815                                                                  3);
1816                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1817                                 continue;
1818                         }
1819                 }
1820
1821                 state->smb1.recv_cmd = cmd;
1822
1823                 if (i == (num_responses - 1)) {
1824                         /*
1825                          * The last request in the chain gets the status
1826                          */
1827                         state->smb1.recv_status = status;
1828                 } else {
1829                         cmd = CVAL(cur[0].iov_base, 0);
1830                         state->smb1.recv_status = NT_STATUS_OK;
1831                 }
1832
1833                 state->inbuf = inbuf;
1834
1835                 /*
1836                  * Note: here we use talloc_reference() in a way
1837                  *       that does not expose it to the caller.
1838                  */
1839                 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
1840                 if (tevent_req_nomem(inbuf_ref, req)) {
1841                         continue;
1842                 }
1843
1844                 /* copy the related buffers */
1845                 state->smb1.recv_iov[0] = iov[0];
1846                 state->smb1.recv_iov[1] = cur[0];
1847                 state->smb1.recv_iov[2] = cur[1];
1848
1849                 tevent_req_done(req);
1850         }
1851
1852         return NT_STATUS_RETRY;
1853 }
1854
1855 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
1856                           TALLOC_CTX *mem_ctx,
1857                           struct iovec **piov,
1858                           uint8_t **phdr,
1859                           uint8_t *pwct,
1860                           uint16_t **pvwv,
1861                           uint32_t *pvwv_offset,
1862                           uint32_t *pnum_bytes,
1863                           uint8_t **pbytes,
1864                           uint32_t *pbytes_offset,
1865                           uint8_t **pinbuf,
1866                           const struct smb1cli_req_expected_response *expected,
1867                           size_t num_expected)
1868 {
1869         struct smbXcli_req_state *state =
1870                 tevent_req_data(req,
1871                 struct smbXcli_req_state);
1872         NTSTATUS status = NT_STATUS_OK;
1873         struct iovec *recv_iov = NULL;
1874         uint8_t *hdr = NULL;
1875         uint8_t wct = 0;
1876         uint32_t vwv_offset = 0;
1877         uint16_t *vwv = NULL;
1878         uint32_t num_bytes = 0;
1879         uint32_t bytes_offset = 0;
1880         uint8_t *bytes = NULL;
1881         size_t i;
1882         bool found_status = false;
1883         bool found_size = false;
1884
1885         if (piov != NULL) {
1886                 *piov = NULL;
1887         }
1888         if (phdr != NULL) {
1889                 *phdr = 0;
1890         }
1891         if (pwct != NULL) {
1892                 *pwct = 0;
1893         }
1894         if (pvwv != NULL) {
1895                 *pvwv = NULL;
1896         }
1897         if (pvwv_offset != NULL) {
1898                 *pvwv_offset = 0;
1899         }
1900         if (pnum_bytes != NULL) {
1901                 *pnum_bytes = 0;
1902         }
1903         if (pbytes != NULL) {
1904                 *pbytes = NULL;
1905         }
1906         if (pbytes_offset != NULL) {
1907                 *pbytes_offset = 0;
1908         }
1909         if (pinbuf != NULL) {
1910                 *pinbuf = NULL;
1911         }
1912
1913         if (state->inbuf != NULL) {
1914                 recv_iov = state->smb1.recv_iov;
1915                 state->smb1.recv_iov = NULL;
1916                 if (state->smb1.recv_cmd != SMBreadBraw) {
1917                         hdr = (uint8_t *)recv_iov[0].iov_base;
1918                         wct = recv_iov[1].iov_len/2;
1919                         vwv = (uint16_t *)recv_iov[1].iov_base;
1920                         vwv_offset = PTR_DIFF(vwv, hdr);
1921                         num_bytes = recv_iov[2].iov_len;
1922                         bytes = (uint8_t *)recv_iov[2].iov_base;
1923                         bytes_offset = PTR_DIFF(bytes, hdr);
1924                 }
1925         }
1926
1927         if (tevent_req_is_nterror(req, &status)) {
1928                 for (i=0; i < num_expected; i++) {
1929                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
1930                                 found_status = true;
1931                                 break;
1932                         }
1933                 }
1934
1935                 if (found_status) {
1936                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
1937                 }
1938
1939                 return status;
1940         }
1941
1942         if (num_expected == 0) {
1943                 found_status = true;
1944                 found_size = true;
1945         }
1946
1947         status = state->smb1.recv_status;
1948
1949         for (i=0; i < num_expected; i++) {
1950                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
1951                         continue;
1952                 }
1953
1954                 found_status = true;
1955                 if (expected[i].wct == 0) {
1956                         found_size = true;
1957                         break;
1958                 }
1959
1960                 if (expected[i].wct == wct) {
1961                         found_size = true;
1962                         break;
1963                 }
1964         }
1965
1966         if (!found_status) {
1967                 return status;
1968         }
1969
1970         if (!found_size) {
1971                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1972         }
1973
1974         if (piov != NULL) {
1975                 *piov = talloc_move(mem_ctx, &recv_iov);
1976         }
1977
1978         if (phdr != NULL) {
1979                 *phdr = hdr;
1980         }
1981         if (pwct != NULL) {
1982                 *pwct = wct;
1983         }
1984         if (pvwv != NULL) {
1985                 *pvwv = vwv;
1986         }
1987         if (pvwv_offset != NULL) {
1988                 *pvwv_offset = vwv_offset;
1989         }
1990         if (pnum_bytes != NULL) {
1991                 *pnum_bytes = num_bytes;
1992         }
1993         if (pbytes != NULL) {
1994                 *pbytes = bytes;
1995         }
1996         if (pbytes_offset != NULL) {
1997                 *pbytes_offset = bytes_offset;
1998         }
1999         if (pinbuf != NULL) {
2000                 *pinbuf = state->inbuf;
2001         }
2002
2003         return status;
2004 }
2005
2006 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
2007 {
2008         size_t wct_ofs;
2009         int i;
2010
2011         wct_ofs = HDR_WCT;
2012
2013         for (i=0; i<num_reqs; i++) {
2014                 struct smbXcli_req_state *state;
2015                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2016                 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
2017                                            state->smb1.iov_count-2);
2018                 wct_ofs = (wct_ofs + 3) & ~3;
2019         }
2020         return wct_ofs;
2021 }
2022
2023 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
2024 {
2025         struct smbXcli_req_state *first_state =
2026                 tevent_req_data(reqs[0],
2027                 struct smbXcli_req_state);
2028         struct smbXcli_req_state *state;
2029         size_t wct_offset;
2030         size_t chain_padding = 0;
2031         int i, iovlen;
2032         struct iovec *iov = NULL;
2033         struct iovec *this_iov;
2034         NTSTATUS status;
2035         size_t nbt_len;
2036
2037         if (num_reqs == 1) {
2038                 return smb1cli_req_writev_submit(reqs[0], first_state,
2039                                                  first_state->smb1.iov,
2040                                                  first_state->smb1.iov_count);
2041         }
2042
2043         iovlen = 0;
2044         for (i=0; i<num_reqs; i++) {
2045                 if (!tevent_req_is_in_progress(reqs[i])) {
2046                         return NT_STATUS_INTERNAL_ERROR;
2047                 }
2048
2049                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2050
2051                 if (state->smb1.iov_count < 4) {
2052                         return NT_STATUS_INVALID_PARAMETER_MIX;
2053                 }
2054
2055                 if (i == 0) {
2056                         /*
2057                          * The NBT and SMB header
2058                          */
2059                         iovlen += 2;
2060                 } else {
2061                         /*
2062                          * Chain padding
2063                          */
2064                         iovlen += 1;
2065                 }
2066
2067                 /*
2068                  * words and bytes
2069                  */
2070                 iovlen += state->smb1.iov_count - 2;
2071         }
2072
2073         iov = talloc_zero_array(first_state, struct iovec, iovlen);
2074         if (iov == NULL) {
2075                 return NT_STATUS_NO_MEMORY;
2076         }
2077
2078         first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
2079                 first_state, reqs, sizeof(*reqs) * num_reqs);
2080         if (first_state->smb1.chained_requests == NULL) {
2081                 TALLOC_FREE(iov);
2082                 return NT_STATUS_NO_MEMORY;
2083         }
2084
2085         wct_offset = HDR_WCT;
2086         this_iov = iov;
2087
2088         for (i=0; i<num_reqs; i++) {
2089                 size_t next_padding = 0;
2090                 uint16_t *vwv;
2091
2092                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2093
2094                 if (i < num_reqs-1) {
2095                         if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
2096                             || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
2097                                 TALLOC_FREE(iov);
2098                                 TALLOC_FREE(first_state->smb1.chained_requests);
2099                                 return NT_STATUS_INVALID_PARAMETER_MIX;
2100                         }
2101                 }
2102
2103                 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
2104                                               state->smb1.iov_count-2) + 1;
2105                 if ((wct_offset % 4) != 0) {
2106                         next_padding = 4 - (wct_offset % 4);
2107                 }
2108                 wct_offset += next_padding;
2109                 vwv = state->smb1.vwv;
2110
2111                 if (i < num_reqs-1) {
2112                         struct smbXcli_req_state *next_state =
2113                                 tevent_req_data(reqs[i+1],
2114                                 struct smbXcli_req_state);
2115                         SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
2116                         SCVAL(vwv+0, 1, 0);
2117                         SSVAL(vwv+1, 0, wct_offset);
2118                 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
2119                         /* properly end the chain */
2120                         SCVAL(vwv+0, 0, 0xff);
2121                         SCVAL(vwv+0, 1, 0xff);
2122                         SSVAL(vwv+1, 0, 0);
2123                 }
2124
2125                 if (i == 0) {
2126                         /*
2127                          * The NBT and SMB header
2128                          */
2129                         this_iov[0] = state->smb1.iov[0];
2130                         this_iov[1] = state->smb1.iov[1];
2131                         this_iov += 2;
2132                 } else {
2133                         /*
2134                          * This one is a bit subtle. We have to add
2135                          * chain_padding bytes between the requests, and we
2136                          * have to also include the wct field of the
2137                          * subsequent requests. We use the subsequent header
2138                          * for the padding, it contains the wct field in its
2139                          * last byte.
2140                          */
2141                         this_iov[0].iov_len = chain_padding+1;
2142                         this_iov[0].iov_base = (void *)&state->smb1.hdr[
2143                                 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
2144                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
2145                         this_iov += 1;
2146                 }
2147
2148                 /*
2149                  * copy the words and bytes
2150                  */
2151                 memcpy(this_iov, state->smb1.iov+2,
2152                        sizeof(struct iovec) * (state->smb1.iov_count-2));
2153                 this_iov += state->smb1.iov_count - 2;
2154                 chain_padding = next_padding;
2155         }
2156
2157         nbt_len = smbXcli_iov_len(&iov[1], iovlen-1);
2158         if (nbt_len > first_state->conn->smb1.max_xmit) {
2159                 TALLOC_FREE(iov);
2160                 TALLOC_FREE(first_state->smb1.chained_requests);
2161                 return NT_STATUS_INVALID_PARAMETER_MIX;
2162         }
2163
2164         status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
2165         if (!NT_STATUS_IS_OK(status)) {
2166                 TALLOC_FREE(iov);
2167                 TALLOC_FREE(first_state->smb1.chained_requests);
2168                 return status;
2169         }
2170
2171         return NT_STATUS_OK;
2172 }
2173
2174 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
2175 {
2176         return ((tevent_queue_length(conn->outgoing) != 0)
2177                 || (talloc_array_length(conn->pending) != 0));
2178 }
2179
2180 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
2181 {
2182         return conn->smb2.server.capabilities;
2183 }
2184
2185 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
2186 {
2187         return conn->smb2.server.security_mode;
2188 }
2189
2190 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
2191 {
2192         return conn->smb2.server.max_trans_size;
2193 }
2194
2195 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
2196 {
2197         return conn->smb2.server.max_read_size;
2198 }
2199
2200 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
2201 {
2202         return conn->smb2.server.max_write_size;
2203 }
2204
2205 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
2206                                   uint16_t max_credits)
2207 {
2208         conn->smb2.max_credits = max_credits;
2209 }
2210
2211 static void smb2cli_req_cancel_done(struct tevent_req *subreq);
2212
2213 static bool smb2cli_req_cancel(struct tevent_req *req)
2214 {
2215         struct smbXcli_req_state *state =
2216                 tevent_req_data(req,
2217                 struct smbXcli_req_state);
2218         uint32_t flags = IVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2219         uint32_t pid = IVAL(state->smb2.hdr, SMB2_HDR_PID);
2220         uint32_t tid = IVAL(state->smb2.hdr, SMB2_HDR_TID);
2221         uint64_t mid = BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID);
2222         uint64_t aid = BVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID);
2223         struct smbXcli_session *session = state->session;
2224         uint8_t *fixed = state->smb2.pad;
2225         uint16_t fixed_len = 4;
2226         struct tevent_req *subreq;
2227         struct smbXcli_req_state *substate;
2228         NTSTATUS status;
2229
2230         SSVAL(fixed, 0, 0x04);
2231         SSVAL(fixed, 2, 0);
2232
2233         subreq = smb2cli_req_create(state, state->ev,
2234                                     state->conn,
2235                                     SMB2_OP_CANCEL,
2236                                     flags, 0,
2237                                     0, /* timeout */
2238                                     pid, tid, session,
2239                                     fixed, fixed_len,
2240                                     NULL, 0);
2241         if (subreq == NULL) {
2242                 return false;
2243         }
2244         substate = tevent_req_data(subreq, struct smbXcli_req_state);
2245
2246         if (flags & SMB2_HDR_FLAG_ASYNC) {
2247                 mid = 0;
2248         }
2249
2250         SIVAL(substate->smb2.hdr, SMB2_HDR_FLAGS, flags);
2251         SIVAL(substate->smb2.hdr, SMB2_HDR_PID, pid);
2252         SIVAL(substate->smb2.hdr, SMB2_HDR_TID, tid);
2253         SBVAL(substate->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2254         SBVAL(substate->smb2.hdr, SMB2_HDR_ASYNC_ID, aid);
2255
2256         status = smb2cli_req_compound_submit(&subreq, 1);
2257         if (!NT_STATUS_IS_OK(status)) {
2258                 TALLOC_FREE(subreq);
2259                 return false;
2260         }
2261
2262         tevent_req_set_callback(subreq, smb2cli_req_cancel_done, NULL);
2263
2264         return true;
2265 }
2266
2267 static void smb2cli_req_cancel_done(struct tevent_req *subreq)
2268 {
2269         /* we do not care about the result */
2270         TALLOC_FREE(subreq);
2271 }
2272
2273 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2274                                       struct tevent_context *ev,
2275                                       struct smbXcli_conn *conn,
2276                                       uint16_t cmd,
2277                                       uint32_t additional_flags,
2278                                       uint32_t clear_flags,
2279                                       uint32_t timeout_msec,
2280                                       uint32_t pid,
2281                                       uint32_t tid,
2282                                       struct smbXcli_session *session,
2283                                       const uint8_t *fixed,
2284                                       uint16_t fixed_len,
2285                                       const uint8_t *dyn,
2286                                       uint32_t dyn_len)
2287 {
2288         struct tevent_req *req;
2289         struct smbXcli_req_state *state;
2290         uint32_t flags = 0;
2291         uint64_t uid = 0;
2292
2293         req = tevent_req_create(mem_ctx, &state,
2294                                 struct smbXcli_req_state);
2295         if (req == NULL) {
2296                 return NULL;
2297         }
2298
2299         state->ev = ev;
2300         state->conn = conn;
2301         state->session = session;
2302
2303         if (session) {
2304                 uid = session->smb2.session_id;
2305         }
2306
2307         state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2308         if (state->smb2.recv_iov == NULL) {
2309                 TALLOC_FREE(req);
2310                 return NULL;
2311         }
2312
2313         flags |= additional_flags;
2314         flags &= ~clear_flags;
2315
2316         state->smb2.fixed = fixed;
2317         state->smb2.fixed_len = fixed_len;
2318         state->smb2.dyn = dyn;
2319         state->smb2.dyn_len = dyn_len;
2320
2321         SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID,    SMB2_MAGIC);
2322         SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH,         SMB2_HDR_BODY);
2323         SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE,         cmd);
2324         SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS,          flags);
2325         SIVAL(state->smb2.hdr, SMB2_HDR_PID,            pid);
2326         SIVAL(state->smb2.hdr, SMB2_HDR_TID,            tid);
2327         SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID,     uid);
2328
2329         switch (cmd) {
2330         case SMB2_OP_CANCEL:
2331                 state->one_way = true;
2332                 break;
2333         case SMB2_OP_BREAK:
2334                 /*
2335                  * If this is a dummy request, it will have
2336                  * UINT64_MAX as message id.
2337                  * If we send on break acknowledgement,
2338                  * this gets overwritten later.
2339                  */
2340                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
2341                 break;
2342         }
2343
2344         if (timeout_msec > 0) {
2345                 struct timeval endtime;
2346
2347                 endtime = timeval_current_ofs_msec(timeout_msec);
2348                 if (!tevent_req_set_endtime(req, ev, endtime)) {
2349                         return req;
2350                 }
2351         }
2352
2353         return req;
2354 }
2355
2356 void smb2cli_req_set_notify_async(struct tevent_req *req)
2357 {
2358         struct smbXcli_req_state *state =
2359                 tevent_req_data(req,
2360                 struct smbXcli_req_state);
2361
2362         state->smb2.notify_async = true;
2363 }
2364
2365 static void smb2cli_req_writev_done(struct tevent_req *subreq);
2366 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2367                                                TALLOC_CTX *tmp_mem,
2368                                                uint8_t *inbuf);
2369
2370 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
2371                                      int num_reqs)
2372 {
2373         struct smbXcli_req_state *state;
2374         struct tevent_req *subreq;
2375         struct iovec *iov;
2376         int i, num_iov, nbt_len;
2377
2378         /*
2379          * 1 for the nbt length
2380          * per request: HDR, fixed, dyn, padding
2381          * -1 because the last one does not need padding
2382          */
2383
2384         iov = talloc_array(reqs[0], struct iovec, 1 + 4*num_reqs - 1);
2385         if (iov == NULL) {
2386                 return NT_STATUS_NO_MEMORY;
2387         }
2388
2389         num_iov = 1;
2390         nbt_len = 0;
2391
2392         for (i=0; i<num_reqs; i++) {
2393                 int hdr_iov;
2394                 size_t reqlen;
2395                 bool ret;
2396                 uint16_t opcode;
2397                 uint64_t avail;
2398                 uint16_t charge;
2399                 uint16_t credits;
2400                 uint64_t mid;
2401                 bool should_sign = false;
2402
2403                 if (!tevent_req_is_in_progress(reqs[i])) {
2404                         return NT_STATUS_INTERNAL_ERROR;
2405                 }
2406
2407                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2408
2409                 if (!smbXcli_conn_is_connected(state->conn)) {
2410                         return NT_STATUS_CONNECTION_DISCONNECTED;
2411                 }
2412
2413                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2414                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2415                         return NT_STATUS_REVISION_MISMATCH;
2416                 }
2417
2418                 opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2419                 if (opcode == SMB2_OP_CANCEL) {
2420                         goto skip_credits;
2421                 }
2422
2423                 avail = UINT64_MAX - state->conn->smb2.mid;
2424                 if (avail < 1) {
2425                         return NT_STATUS_CONNECTION_ABORTED;
2426                 }
2427
2428                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2429                         charge = (MAX(state->smb2.dyn_len, 1) - 1)/ 65536 + 1;
2430                 } else {
2431                         charge = 1;
2432                 }
2433
2434                 charge = MAX(state->smb2.credit_charge, charge);
2435
2436                 avail = MIN(avail, state->conn->smb2.cur_credits);
2437                 if (avail < charge) {
2438                         return NT_STATUS_INTERNAL_ERROR;
2439                 }
2440
2441                 credits = 0;
2442                 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
2443                         credits = state->conn->smb2.max_credits -
2444                                   state->conn->smb2.cur_credits;
2445                 }
2446                 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
2447                         credits += 1;
2448                 }
2449
2450                 mid = state->conn->smb2.mid;
2451                 state->conn->smb2.mid += charge;
2452                 state->conn->smb2.cur_credits -= charge;
2453
2454                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2455                         SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
2456                 }
2457                 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
2458                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2459
2460 skip_credits:
2461                 hdr_iov = num_iov;
2462                 iov[num_iov].iov_base = state->smb2.hdr;
2463                 iov[num_iov].iov_len  = sizeof(state->smb2.hdr);
2464                 num_iov += 1;
2465
2466                 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
2467                 iov[num_iov].iov_len  = state->smb2.fixed_len;
2468                 num_iov += 1;
2469
2470                 if (state->smb2.dyn != NULL) {
2471                         iov[num_iov].iov_base = discard_const(state->smb2.dyn);
2472                         iov[num_iov].iov_len  = state->smb2.dyn_len;
2473                         num_iov += 1;
2474                 }
2475
2476                 reqlen  = sizeof(state->smb2.hdr);
2477                 reqlen += state->smb2.fixed_len;
2478                 reqlen += state->smb2.dyn_len;
2479
2480                 if (i < num_reqs-1) {
2481                         if ((reqlen % 8) > 0) {
2482                                 uint8_t pad = 8 - (reqlen % 8);
2483                                 iov[num_iov].iov_base = state->smb2.pad;
2484                                 iov[num_iov].iov_len = pad;
2485                                 num_iov += 1;
2486                                 reqlen += pad;
2487                         }
2488                         SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
2489                 }
2490                 nbt_len += reqlen;
2491
2492                 if (state->session) {
2493                         should_sign = state->session->smb2.should_sign;
2494                         if (state->session->smb2.channel_setup) {
2495                                 should_sign = true;
2496                         }
2497                 }
2498
2499                 if (should_sign) {
2500                         NTSTATUS status;
2501
2502                         status = smb2_signing_sign_pdu(state->session->smb2.signing_key,
2503                                                        &iov[hdr_iov], num_iov - hdr_iov);
2504                         if (!NT_STATUS_IS_OK(status)) {
2505                                 return status;
2506                         }
2507                 }
2508
2509                 ret = smbXcli_req_set_pending(reqs[i]);
2510                 if (!ret) {
2511                         return NT_STATUS_NO_MEMORY;
2512                 }
2513         }
2514
2515         state = tevent_req_data(reqs[0], struct smbXcli_req_state);
2516         _smb_setlen_tcp(state->length_hdr, nbt_len);
2517         iov[0].iov_base = state->length_hdr;
2518         iov[0].iov_len  = sizeof(state->length_hdr);
2519
2520         if (state->conn->dispatch_incoming == NULL) {
2521                 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
2522         }
2523
2524         subreq = writev_send(state, state->ev, state->conn->outgoing,
2525                              state->conn->write_fd, false, iov, num_iov);
2526         if (subreq == NULL) {
2527                 return NT_STATUS_NO_MEMORY;
2528         }
2529         tevent_req_set_callback(subreq, smb2cli_req_writev_done, reqs[0]);
2530         return NT_STATUS_OK;
2531 }
2532
2533 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
2534 {
2535         struct smbXcli_req_state *state =
2536                 tevent_req_data(req,
2537                 struct smbXcli_req_state);
2538
2539         state->smb2.credit_charge = charge;
2540 }
2541
2542 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
2543                                     struct tevent_context *ev,
2544                                     struct smbXcli_conn *conn,
2545                                     uint16_t cmd,
2546                                     uint32_t additional_flags,
2547                                     uint32_t clear_flags,
2548                                     uint32_t timeout_msec,
2549                                     uint32_t pid,
2550                                     uint32_t tid,
2551                                     struct smbXcli_session *session,
2552                                     const uint8_t *fixed,
2553                                     uint16_t fixed_len,
2554                                     const uint8_t *dyn,
2555                                     uint32_t dyn_len)
2556 {
2557         struct tevent_req *req;
2558         NTSTATUS status;
2559
2560         req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
2561                                  additional_flags, clear_flags,
2562                                  timeout_msec,
2563                                  pid, tid, session,
2564                                  fixed, fixed_len, dyn, dyn_len);
2565         if (req == NULL) {
2566                 return NULL;
2567         }
2568         if (!tevent_req_is_in_progress(req)) {
2569                 return tevent_req_post(req, ev);
2570         }
2571         status = smb2cli_req_compound_submit(&req, 1);
2572         if (tevent_req_nterror(req, status)) {
2573                 return tevent_req_post(req, ev);
2574         }
2575         return req;
2576 }
2577
2578 static void smb2cli_req_writev_done(struct tevent_req *subreq)
2579 {
2580         struct tevent_req *req =
2581                 tevent_req_callback_data(subreq,
2582                 struct tevent_req);
2583         struct smbXcli_req_state *state =
2584                 tevent_req_data(req,
2585                 struct smbXcli_req_state);
2586         ssize_t nwritten;
2587         int err;
2588
2589         nwritten = writev_recv(subreq, &err);
2590         TALLOC_FREE(subreq);
2591         if (nwritten == -1) {
2592                 /* here, we need to notify all pending requests */
2593                 NTSTATUS status = map_nt_error_from_unix_common(err);
2594                 smbXcli_conn_disconnect(state->conn, status);
2595                 return;
2596         }
2597 }
2598
2599 static NTSTATUS smb2cli_inbuf_parse_compound(uint8_t *buf, TALLOC_CTX *mem_ctx,
2600                                              struct iovec **piov, int *pnum_iov)
2601 {
2602         struct iovec *iov;
2603         int num_iov;
2604         size_t buflen;
2605         size_t taken;
2606         uint8_t *first_hdr;
2607
2608         num_iov = 0;
2609
2610         iov = talloc_array(mem_ctx, struct iovec, num_iov);
2611         if (iov == NULL) {
2612                 return NT_STATUS_NO_MEMORY;
2613         }
2614
2615         buflen = smb_len_tcp(buf);
2616         taken = 0;
2617         first_hdr = buf + NBT_HDR_SIZE;
2618
2619         while (taken < buflen) {
2620                 size_t len = buflen - taken;
2621                 uint8_t *hdr = first_hdr + taken;
2622                 struct iovec *cur;
2623                 size_t full_size;
2624                 size_t next_command_ofs;
2625                 uint16_t body_size;
2626                 struct iovec *iov_tmp;
2627
2628                 /*
2629                  * We need the header plus the body length field
2630                  */
2631
2632                 if (len < SMB2_HDR_BODY + 2) {
2633                         DEBUG(10, ("%d bytes left, expected at least %d\n",
2634                                    (int)len, SMB2_HDR_BODY));
2635                         goto inval;
2636                 }
2637                 if (IVAL(hdr, 0) != SMB2_MAGIC) {
2638                         DEBUG(10, ("Got non-SMB2 PDU: %x\n",
2639                                    IVAL(hdr, 0)));
2640                         goto inval;
2641                 }
2642                 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
2643                         DEBUG(10, ("Got HDR len %d, expected %d\n",
2644                                    SVAL(hdr, 4), SMB2_HDR_BODY));
2645                         goto inval;
2646                 }
2647
2648                 full_size = len;
2649                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
2650                 body_size = SVAL(hdr, SMB2_HDR_BODY);
2651
2652                 if (next_command_ofs != 0) {
2653                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
2654                                 goto inval;
2655                         }
2656                         if (next_command_ofs > full_size) {
2657                                 goto inval;
2658                         }
2659                         full_size = next_command_ofs;
2660                 }
2661                 if (body_size < 2) {
2662                         goto inval;
2663                 }
2664                 body_size &= 0xfffe;
2665
2666                 if (body_size > (full_size - SMB2_HDR_BODY)) {
2667                         goto inval;
2668                 }
2669
2670                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
2671                                          num_iov + 3);
2672                 if (iov_tmp == NULL) {
2673                         TALLOC_FREE(iov);
2674                         return NT_STATUS_NO_MEMORY;
2675                 }
2676                 iov = iov_tmp;
2677                 cur = &iov[num_iov];
2678                 num_iov += 3;
2679
2680                 cur[0].iov_base = hdr;
2681                 cur[0].iov_len  = SMB2_HDR_BODY;
2682                 cur[1].iov_base = hdr + SMB2_HDR_BODY;
2683                 cur[1].iov_len  = body_size;
2684                 cur[2].iov_base = hdr + SMB2_HDR_BODY + body_size;
2685                 cur[2].iov_len  = full_size - (SMB2_HDR_BODY + body_size);
2686
2687                 taken += full_size;
2688         }
2689
2690         *piov = iov;
2691         *pnum_iov = num_iov;
2692         return NT_STATUS_OK;
2693
2694 inval:
2695         TALLOC_FREE(iov);
2696         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2697 }
2698
2699 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
2700                                                     uint64_t mid)
2701 {
2702         size_t num_pending = talloc_array_length(conn->pending);
2703         size_t i;
2704
2705         for (i=0; i<num_pending; i++) {
2706                 struct tevent_req *req = conn->pending[i];
2707                 struct smbXcli_req_state *state =
2708                         tevent_req_data(req,
2709                         struct smbXcli_req_state);
2710
2711                 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
2712                         return req;
2713                 }
2714         }
2715         return NULL;
2716 }
2717
2718 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2719                                                TALLOC_CTX *tmp_mem,
2720                                                uint8_t *inbuf)
2721 {
2722         struct tevent_req *req;
2723         struct smbXcli_req_state *state = NULL;
2724         struct iovec *iov;
2725         int i, num_iov;
2726         NTSTATUS status;
2727         bool defer = true;
2728         struct smbXcli_session *last_session = NULL;
2729
2730         status = smb2cli_inbuf_parse_compound(inbuf, tmp_mem,
2731                                               &iov, &num_iov);
2732         if (!NT_STATUS_IS_OK(status)) {
2733                 return status;
2734         }
2735
2736         for (i=0; i<num_iov; i+=3) {
2737                 uint8_t *inbuf_ref = NULL;
2738                 struct iovec *cur = &iov[i];
2739                 uint8_t *inhdr = (uint8_t *)cur[0].iov_base;
2740                 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
2741                 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
2742                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
2743                 uint16_t req_opcode;
2744                 uint32_t req_flags;
2745                 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
2746                 uint32_t new_credits;
2747                 struct smbXcli_session *session = NULL;
2748                 const DATA_BLOB *signing_key = NULL;
2749                 bool should_sign = false;
2750
2751                 new_credits = conn->smb2.cur_credits;
2752                 new_credits += credits;
2753                 if (new_credits > UINT16_MAX) {
2754                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2755                 }
2756                 conn->smb2.cur_credits += credits;
2757
2758                 req = smb2cli_conn_find_pending(conn, mid);
2759                 if (req == NULL) {
2760                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2761                 }
2762                 state = tevent_req_data(req, struct smbXcli_req_state);
2763
2764                 state->smb2.got_async = false;
2765
2766                 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2767                 if (opcode != req_opcode) {
2768                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2769                 }
2770                 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2771
2772                 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
2773                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2774                 }
2775
2776                 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
2777                 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
2778                     NT_STATUS_EQUAL(status, STATUS_PENDING)) {
2779                         uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
2780
2781                         /*
2782                          * async interim responses are not signed,
2783                          * even if the SMB2_HDR_FLAG_SIGNED flag
2784                          * is set.
2785                          */
2786                         req_flags |= SMB2_HDR_FLAG_ASYNC;
2787                         SBVAL(state->smb2.hdr, SMB2_HDR_FLAGS, req_flags);
2788                         SBVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID, async_id);
2789
2790                         if (state->smb2.notify_async) {
2791                                 state->smb2.got_async = true;
2792                                 tevent_req_defer_callback(req, state->ev);
2793                                 tevent_req_notify_callback(req);
2794                         }
2795                         continue;
2796                 }
2797
2798                 session = state->session;
2799                 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
2800                         session = last_session;
2801                 }
2802                 last_session = session;
2803
2804                 if (session) {
2805                         should_sign = session->smb2.should_sign;
2806                         if (session->smb2.channel_setup) {
2807                                 should_sign = true;
2808                         }
2809                 }
2810
2811                 if (should_sign) {
2812                         if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
2813                                 return NT_STATUS_ACCESS_DENIED;
2814                         }
2815                 }
2816
2817                 if (flags & SMB2_HDR_FLAG_SIGNED) {
2818                         uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
2819
2820                         if (session == NULL) {
2821                                 struct smbXcli_session *s;
2822
2823                                 s = state->conn->sessions;
2824                                 for (; s; s = s->next) {
2825                                         if (s->smb2.session_id != uid) {
2826                                                 continue;
2827                                         }
2828
2829                                         session = s;
2830                                         break;
2831                                 }
2832                         }
2833
2834                         if (session == NULL) {
2835                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2836                         }
2837
2838                         last_session = session;
2839                         signing_key = &session->smb2.signing_key;
2840                 }
2841
2842                 if ((opcode == SMB2_OP_SESSSETUP) &&
2843                      NT_STATUS_IS_OK(status)) {
2844                         /*
2845                          * the caller has to check the signing
2846                          * as only the caller knows the correct
2847                          * session key
2848                          */
2849                         signing_key = NULL;
2850                 }
2851
2852                 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
2853                         /*
2854                          * if the server returns NT_STATUS_USER_SESSION_DELETED
2855                          * the response is not signed and we should
2856                          * propagate the NT_STATUS_USER_SESSION_DELETED
2857                          * status to the caller.
2858                          */
2859                         if (signing_key) {
2860                                 signing_key = NULL;
2861                         }
2862                 }
2863
2864                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
2865                     NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
2866                     NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
2867                         /*
2868                          * if the server returns
2869                          * NT_STATUS_NETWORK_NAME_DELETED
2870                          * NT_STATUS_FILE_CLOSED
2871                          * NT_STATUS_INVALID_PARAMETER
2872                          * the response might not be signed
2873                          * as this happens before the signing checks.
2874                          *
2875                          * If server echos the signature (or all zeros)
2876                          * we should report the status from the server
2877                          * to the caller.
2878                          */
2879                         if (signing_key) {
2880                                 int cmp;
2881
2882                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
2883                                              state->smb2.hdr+SMB2_HDR_SIGNATURE,
2884                                              16);
2885                                 if (cmp == 0) {
2886                                         state->smb2.signing_skipped = true;
2887                                         signing_key = NULL;
2888                                 }
2889                         }
2890                         if (signing_key) {
2891                                 int cmp;
2892                                 static const uint8_t zeros[16];
2893
2894                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
2895                                              zeros,
2896                                              16);
2897                                 if (cmp == 0) {
2898                                         state->smb2.signing_skipped = true;
2899                                         signing_key = NULL;
2900                                 }
2901                         }
2902                 }
2903
2904                 if (signing_key) {
2905                         status = smb2_signing_check_pdu(*signing_key, cur, 3);
2906                         if (!NT_STATUS_IS_OK(status)) {
2907                                 /*
2908                                  * If the signing check fails, we disconnect
2909                                  * the connection.
2910                                  */
2911                                 return status;
2912                         }
2913                 }
2914
2915                 smbXcli_req_unset_pending(req);
2916
2917                 /*
2918                  * There might be more than one response
2919                  * we need to defer the notifications
2920                  */
2921                 if ((num_iov == 4) && (talloc_array_length(conn->pending) == 0)) {
2922                         defer = false;
2923                 }
2924
2925                 if (defer) {
2926                         tevent_req_defer_callback(req, state->ev);
2927                 }
2928
2929                 /*
2930                  * Note: here we use talloc_reference() in a way
2931                  *       that does not expose it to the caller.
2932                  */
2933                 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
2934                 if (tevent_req_nomem(inbuf_ref, req)) {
2935                         continue;
2936                 }
2937
2938                 /* copy the related buffers */
2939                 state->smb2.recv_iov[0] = cur[0];
2940                 state->smb2.recv_iov[1] = cur[1];
2941                 state->smb2.recv_iov[2] = cur[2];
2942
2943                 tevent_req_done(req);
2944         }
2945
2946         if (defer) {
2947                 return NT_STATUS_RETRY;
2948         }
2949
2950         return NT_STATUS_OK;
2951 }
2952
2953 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2954                           struct iovec **piov,
2955                           const struct smb2cli_req_expected_response *expected,
2956                           size_t num_expected)
2957 {
2958         struct smbXcli_req_state *state =
2959                 tevent_req_data(req,
2960                 struct smbXcli_req_state);
2961         NTSTATUS status;
2962         size_t body_size;
2963         bool found_status = false;
2964         bool found_size = false;
2965         size_t i;
2966
2967         if (piov != NULL) {
2968                 *piov = NULL;
2969         }
2970
2971         if (state->smb2.got_async) {
2972                 return STATUS_PENDING;
2973         }
2974
2975         if (tevent_req_is_nterror(req, &status)) {
2976                 for (i=0; i < num_expected; i++) {
2977                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
2978                                 found_status = true;
2979                                 break;
2980                         }
2981                 }
2982
2983                 if (found_status) {
2984                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2985                 }
2986
2987                 return status;
2988         }
2989
2990         if (num_expected == 0) {
2991                 found_status = true;
2992                 found_size = true;
2993         }
2994
2995         status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
2996         body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
2997
2998         for (i=0; i < num_expected; i++) {
2999                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
3000                         continue;
3001                 }
3002
3003                 found_status = true;
3004                 if (expected[i].body_size == 0) {
3005                         found_size = true;
3006                         break;
3007                 }
3008
3009                 if (expected[i].body_size == body_size) {
3010                         found_size = true;
3011                         break;
3012                 }
3013         }
3014
3015         if (!found_status) {
3016                 return status;
3017         }
3018
3019         if (state->smb2.signing_skipped) {
3020                 if (num_expected > 0) {
3021                         return NT_STATUS_ACCESS_DENIED;
3022                 }
3023                 if (!NT_STATUS_IS_ERR(status)) {
3024                         return NT_STATUS_ACCESS_DENIED;
3025                 }
3026         }
3027
3028         if (!found_size) {
3029                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3030         }
3031
3032         if (piov != NULL) {
3033                 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
3034         }
3035
3036         return status;
3037 }
3038
3039 static const struct {
3040         enum protocol_types proto;
3041         const char *smb1_name;
3042 } smb1cli_prots[] = {
3043         {PROTOCOL_CORE,         "PC NETWORK PROGRAM 1.0"},
3044         {PROTOCOL_COREPLUS,     "MICROSOFT NETWORKS 1.03"},
3045         {PROTOCOL_LANMAN1,      "MICROSOFT NETWORKS 3.0"},
3046         {PROTOCOL_LANMAN1,      "LANMAN1.0"},
3047         {PROTOCOL_LANMAN2,      "LM1.2X002"},
3048         {PROTOCOL_LANMAN2,      "DOS LANMAN2.1"},
3049         {PROTOCOL_LANMAN2,      "LANMAN2.1"},
3050         {PROTOCOL_LANMAN2,      "Samba"},
3051         {PROTOCOL_NT1,          "NT LANMAN 1.0"},
3052         {PROTOCOL_NT1,          "NT LM 0.12"},
3053         {PROTOCOL_SMB2_02,      "SMB 2.002"},
3054         {PROTOCOL_SMB2_10,      "SMB 2.???"},
3055 };
3056
3057 static const struct {
3058         enum protocol_types proto;
3059         uint16_t smb2_dialect;
3060 } smb2cli_prots[] = {
3061         {PROTOCOL_SMB2_02,      SMB2_DIALECT_REVISION_202},
3062         {PROTOCOL_SMB2_10,      SMB2_DIALECT_REVISION_210},
3063         {PROTOCOL_SMB2_22,      SMB2_DIALECT_REVISION_222},
3064 };
3065
3066 struct smbXcli_negprot_state {
3067         struct smbXcli_conn *conn;
3068         struct tevent_context *ev;
3069         uint32_t timeout_msec;
3070         enum protocol_types min_protocol;
3071         enum protocol_types max_protocol;
3072
3073         struct {
3074                 uint8_t fixed[36];
3075                 uint8_t dyn[ARRAY_SIZE(smb2cli_prots)*2];
3076         } smb2;
3077 };
3078
3079 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
3080 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
3081 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
3082 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
3083 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
3084 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3085                                                   TALLOC_CTX *frame,
3086                                                   uint8_t *inbuf);
3087
3088 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
3089                                         struct tevent_context *ev,
3090                                         struct smbXcli_conn *conn,
3091                                         uint32_t timeout_msec,
3092                                         enum protocol_types min_protocol,
3093                                         enum protocol_types max_protocol)
3094 {
3095         struct tevent_req *req, *subreq;
3096         struct smbXcli_negprot_state *state;
3097
3098         req = tevent_req_create(mem_ctx, &state,
3099                                 struct smbXcli_negprot_state);
3100         if (req == NULL) {
3101                 return NULL;
3102         }
3103         state->conn = conn;
3104         state->ev = ev;
3105         state->timeout_msec = timeout_msec;
3106         state->min_protocol = min_protocol;
3107         state->max_protocol = max_protocol;
3108
3109         if (min_protocol == PROTOCOL_NONE) {
3110                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3111                 return tevent_req_post(req, ev);
3112         }
3113
3114         if (max_protocol == PROTOCOL_NONE) {
3115                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3116                 return tevent_req_post(req, ev);
3117         }
3118
3119         if (min_protocol > max_protocol) {
3120                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3121                 return tevent_req_post(req, ev);
3122         }
3123
3124         if ((min_protocol < PROTOCOL_SMB2_02) &&
3125             (max_protocol < PROTOCOL_SMB2_02)) {
3126                 /*
3127                  * SMB1 only...
3128                  */
3129                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
3130
3131                 subreq = smbXcli_negprot_smb1_subreq(state);
3132                 if (tevent_req_nomem(subreq, req)) {
3133                         return tevent_req_post(req, ev);
3134                 }
3135                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
3136                 return req;
3137         }
3138
3139         if ((min_protocol >= PROTOCOL_SMB2_02) &&
3140             (max_protocol >= PROTOCOL_SMB2_02)) {
3141                 /*
3142                  * SMB2 only...
3143                  */
3144                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3145
3146                 subreq = smbXcli_negprot_smb2_subreq(state);
3147                 if (tevent_req_nomem(subreq, req)) {
3148                         return tevent_req_post(req, ev);
3149                 }
3150                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3151                 return req;
3152         }
3153
3154         /*
3155          * We send an SMB1 negprot with the SMB2 dialects
3156          * and expect a SMB1 or a SMB2 response.
3157          *
3158          * smbXcli_negprot_dispatch_incoming() will fix the
3159          * callback to match protocol of the response.
3160          */
3161         conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
3162
3163         subreq = smbXcli_negprot_smb1_subreq(state);
3164         if (tevent_req_nomem(subreq, req)) {
3165                 return tevent_req_post(req, ev);
3166         }
3167         tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
3168         return req;
3169 }
3170
3171 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
3172 {
3173         struct tevent_req *req =
3174                 tevent_req_callback_data(subreq,
3175                 struct tevent_req);
3176         NTSTATUS status;
3177
3178         /*
3179          * we just want the low level error
3180          */
3181         status = tevent_req_simple_recv_ntstatus(subreq);
3182         TALLOC_FREE(subreq);
3183         if (tevent_req_nterror(req, status)) {
3184                 return;
3185         }
3186
3187         /* this should never happen */
3188         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
3189 }
3190
3191 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
3192 {
3193         size_t i;
3194         DATA_BLOB bytes = data_blob_null;
3195         uint8_t flags;
3196         uint16_t flags2;
3197
3198         /* setup the protocol strings */
3199         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3200                 uint8_t c = 2;
3201                 bool ok;
3202
3203                 if (smb1cli_prots[i].proto < state->min_protocol) {
3204                         continue;
3205                 }
3206
3207                 if (smb1cli_prots[i].proto > state->max_protocol) {
3208                     &nbs