samba-tool: py3 compatiblity in 'user syncpasswords --daemon'
[bbaumbach/samba-autobuild/.git] / source4 / librpc / rpc / dcerpc_util.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    dcerpc utility functions
5
6    Copyright (C) Andrew Tridgell 2003
7    Copyright (C) Jelmer Vernooij 2004
8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
9    Copyright (C) Rafal Szczesniak 2006
10    
11    This program is free software; you can redistribute it and/or modify
12    it under the terms of the GNU General Public License as published by
13    the Free Software Foundation; either version 3 of the License, or
14    (at your option) any later version.
15    
16    This program is distributed in the hope that it will be useful,
17    but WITHOUT ANY WARRANTY; without even the implied warranty of
18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19    GNU General Public License for more details.
20    
21    You should have received a copy of the GNU General Public License
22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
23 */
24
25 #include "includes.h"
26 #include "lib/events/events.h"
27 #include "libcli/composite/composite.h"
28 #include "librpc/gen_ndr/ndr_epmapper_c.h"
29 #include "librpc/gen_ndr/ndr_dcerpc.h"
30 #include "librpc/gen_ndr/ndr_misc.h"
31 #include "librpc/rpc/dcerpc_proto.h"
32 #include "auth/credentials/credentials.h"
33 #include "auth/gensec/gensec.h"
34 #include "param/param.h"
35 #include "librpc/rpc/rpc_common.h"
36
37 /*
38   find a dcerpc call on an interface by name
39 */
40 const struct ndr_interface_call *dcerpc_iface_find_call(const struct ndr_interface_table *iface,
41                                                         const char *name)
42 {
43         int i;
44         for (i=0;i<iface->num_calls;i++) {
45                 if (strcmp(iface->calls[i].name, name) == 0) {
46                         return &iface->calls[i];
47                 }
48         }
49         return NULL;
50 }
51
52 struct epm_map_binding_state {
53         struct dcerpc_binding *binding;
54         const struct ndr_interface_table *table;
55         struct dcerpc_pipe *pipe;
56         struct policy_handle handle;
57         struct GUID object;
58         struct epm_twr_t twr;
59         struct epm_twr_t *twr_r;
60         uint32_t num_towers;
61         struct epm_Map r;
62 };
63
64
65 static void continue_epm_recv_binding(struct composite_context *ctx);
66 static void continue_epm_map(struct tevent_req *subreq);
67
68
69 /*
70   Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
71   mapping rpc request
72 */
73 static void continue_epm_recv_binding(struct composite_context *ctx)
74 {
75         struct composite_context *c = talloc_get_type(ctx->async.private_data,
76                                                       struct composite_context);
77         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
78                                                           struct epm_map_binding_state);
79         struct tevent_req *subreq;
80
81         /* receive result of rpc pipe connect request */
82         c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
83         if (!composite_is_ok(c)) return;
84
85         c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
86         if (!composite_is_ok(c)) return;
87         
88         /* with some nice pretty paper around it of course */
89         s->r.in.object        = &s->object;
90         s->r.in.map_tower     = &s->twr;
91         s->r.in.entry_handle  = &s->handle;
92         s->r.in.max_towers    = 1;
93         s->r.out.entry_handle = &s->handle;
94         s->r.out.num_towers   = &s->num_towers;
95
96         /* send request for an endpoint mapping - a rpc request on connected pipe */
97         subreq = dcerpc_epm_Map_r_send(s, c->event_ctx,
98                                        s->pipe->binding_handle,
99                                        &s->r);
100         if (composite_nomem(subreq, c)) return;
101         
102         tevent_req_set_callback(subreq, continue_epm_map, c);
103 }
104
105
106 /*
107   Stage 3 of epm_map_binding: Receive endpoint mapping and provide binding details
108 */
109 static void continue_epm_map(struct tevent_req *subreq)
110 {
111         struct composite_context *c = tevent_req_callback_data(subreq,
112                                       struct composite_context);
113         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
114                                                           struct epm_map_binding_state);
115         const char *endpoint;
116
117         /* receive result of a rpc request */
118         c->status = dcerpc_epm_Map_r_recv(subreq, s);
119         TALLOC_FREE(subreq);
120         if (!composite_is_ok(c)) return;
121
122         /* check the details */
123         if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
124                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
125                 return;
126         }
127         
128         s->twr_r = s->r.out.towers[0].twr;
129         if (s->twr_r == NULL) {
130                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
131                 return;
132         }
133
134         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
135             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
136                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
137                 return;
138         }
139
140         /* get received endpoint */
141         endpoint = dcerpc_floor_get_rhs_data(s, &s->twr_r->tower.floors[3]);
142         if (composite_nomem(endpoint, c)) return;
143
144         c->status = dcerpc_binding_set_string_option(s->binding,
145                                                      "endpoint",
146                                                      endpoint);
147         if (!composite_is_ok(c)) {
148                 return;
149         }
150
151         composite_done(c);
152 }
153
154
155 /*
156   Request for endpoint mapping of dcerpc binding - try to request for endpoint
157   unless there is default one.
158 */
159 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
160                                                       struct dcerpc_binding *binding,
161                                                       const struct ndr_interface_table *table,
162                                                       struct cli_credentials *creds,
163                                                       struct tevent_context *ev,
164                                                       struct loadparm_context *lp_ctx)
165 {
166         struct composite_context *c;
167         struct epm_map_binding_state *s;
168         struct composite_context *pipe_connect_req;
169         NTSTATUS status;
170         struct dcerpc_binding *epmapper_binding;
171         int i;
172
173         if (ev == NULL) {
174                 return NULL;
175         }
176
177         /* composite context allocation and setup */
178         c = composite_create(mem_ctx, ev);
179         if (c == NULL) {
180                 return NULL;
181         }
182
183         s = talloc_zero(c, struct epm_map_binding_state);
184         if (composite_nomem(s, c)) return c;
185         c->private_data = s;
186
187         s->binding = binding;
188         s->object  = dcerpc_binding_get_object(binding);
189         s->table   = table;
190
191         c->status = dcerpc_binding_set_abstract_syntax(binding,
192                                                        &table->syntax_id);
193         if (!composite_is_ok(c)) {
194                 return c;
195         }
196
197         /*
198           First, check if there is a default endpoint specified in the IDL
199         */
200         for (i = 0; i < table->endpoints->count; i++) {
201                 struct dcerpc_binding *default_binding;
202                 enum dcerpc_transport_t transport;
203                 enum dcerpc_transport_t dtransport;
204                 const char *dendpoint = NULL;
205
206                 status = dcerpc_parse_binding(s,
207                                               table->endpoints->names[i],
208                                               &default_binding);
209                 if (!NT_STATUS_IS_OK(status)) {
210                         continue;
211                 }
212
213                 transport = dcerpc_binding_get_transport(binding);
214                 dtransport = dcerpc_binding_get_transport(default_binding);
215                 if (transport == NCA_UNKNOWN) {
216                         c->status = dcerpc_binding_set_transport(binding,
217                                                                  dtransport);
218                         if (!composite_is_ok(c)) {
219                                 return c;
220                         }
221                         transport = dtransport;
222                 }
223
224                 if (transport != dtransport) {
225                         TALLOC_FREE(default_binding);
226                         continue;
227                 }
228
229                 dendpoint = dcerpc_binding_get_string_option(default_binding,
230                                                              "endpoint");
231                 if (dendpoint == NULL) {
232                         TALLOC_FREE(default_binding);
233                         continue;
234                 }
235
236                 c->status = dcerpc_binding_set_string_option(binding,
237                                                              "endpoint",
238                                                              dendpoint);
239                 if (!composite_is_ok(c)) {
240                         return c;
241                 }
242
243                 TALLOC_FREE(default_binding);
244                 composite_done(c);
245                 return c;
246         }
247
248         epmapper_binding = dcerpc_binding_dup(s, binding);
249         if (composite_nomem(epmapper_binding, c)) return c;
250
251         /* basic endpoint mapping data */
252         c->status = dcerpc_binding_set_string_option(epmapper_binding,
253                                                      "endpoint", NULL);
254         if (!composite_is_ok(c)) {
255                 return c;
256         }
257         c->status = dcerpc_binding_set_flags(epmapper_binding, 0, UINT32_MAX);
258         if (!composite_is_ok(c)) {
259                 return c;
260         }
261         c->status = dcerpc_binding_set_assoc_group_id(epmapper_binding, 0);
262         if (!composite_is_ok(c)) {
263                 return c;
264         }
265         c->status = dcerpc_binding_set_object(epmapper_binding, GUID_zero());
266         if (!composite_is_ok(c)) {
267                 return c;
268         }
269
270         /* initiate rpc pipe connection */
271         pipe_connect_req = dcerpc_pipe_connect_b_send(s, epmapper_binding,
272                                                       &ndr_table_epmapper,
273                                                       creds, c->event_ctx,
274                                                       lp_ctx);
275         if (composite_nomem(pipe_connect_req, c)) return c;
276         
277         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
278         return c;
279 }
280
281
282 /*
283   Receive result of endpoint mapping request
284  */
285 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
286 {
287         NTSTATUS status = composite_wait(c);
288         
289         talloc_free(c);
290         return status;
291 }
292
293
294 /*
295   Get endpoint mapping for rpc connection
296 */
297 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
298                                 const struct ndr_interface_table *table, struct tevent_context *ev,
299                                 struct loadparm_context *lp_ctx)
300 {
301         struct composite_context *c;
302         struct cli_credentials *epm_creds;
303
304         epm_creds = cli_credentials_init_anon(mem_ctx);
305         if (epm_creds == NULL) {
306                 return NT_STATUS_NO_MEMORY;
307         }
308         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, epm_creds, ev, lp_ctx);
309         if (c == NULL) {
310                 talloc_free(epm_creds);
311                 return NT_STATUS_NO_MEMORY;
312         }
313         talloc_steal(c, epm_creds);
314         return dcerpc_epm_map_binding_recv(c);
315 }
316
317
318 struct pipe_auth_state {
319         struct dcerpc_pipe *pipe;
320         const struct dcerpc_binding *binding;
321         const struct ndr_interface_table *table;
322         struct loadparm_context *lp_ctx;
323         struct cli_credentials *credentials;
324         unsigned int logon_retries;
325 };
326
327
328 static void continue_auth_schannel(struct composite_context *ctx);
329 static void continue_auth(struct composite_context *ctx);
330 static void continue_auth_none(struct composite_context *ctx);
331 static void continue_ntlmssp_connection(struct composite_context *ctx);
332 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
333
334
335 /*
336   Stage 2 of pipe_auth: Receive result of schannel bind request
337 */
338 static void continue_auth_schannel(struct composite_context *ctx)
339 {
340         struct composite_context *c = talloc_get_type(ctx->async.private_data,
341                                                       struct composite_context);
342
343         c->status = dcerpc_bind_auth_schannel_recv(ctx);
344         if (!composite_is_ok(c)) return;
345
346         composite_done(c);
347 }
348
349
350 /*
351   Stage 2 of pipe_auth: Receive result of authenticated bind request
352 */
353 static void continue_auth(struct composite_context *ctx)
354 {
355         struct composite_context *c = talloc_get_type(ctx->async.private_data,
356                                                       struct composite_context);
357
358         c->status = dcerpc_bind_auth_recv(ctx);
359         if (!composite_is_ok(c)) return;
360         
361         composite_done(c);
362 }
363 /*
364   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
365   SPNEGO -> NTLMSSP
366 */
367 static void continue_auth_auto(struct composite_context *ctx)
368 {
369         struct composite_context *c = talloc_get_type(ctx->async.private_data,
370                                                       struct composite_context);
371         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
372         struct composite_context *sec_conn_req;
373
374         c->status = dcerpc_bind_auth_recv(ctx);
375         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
376                 /*
377                  * Retry with NTLMSSP auth as fallback
378                  * send a request for secondary rpc connection
379                  */
380                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
381                                                                 s->binding);
382                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
383                 return;
384         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE) ||
385                    NT_STATUS_EQUAL(c->status, NT_STATUS_UNSUCCESSFUL)) {
386                 /*
387                   try a second time on any error. We don't just do it
388                   on LOGON_FAILURE as some servers will give a
389                   NT_STATUS_UNSUCCESSFUL on a authentication error on RPC
390                  */
391                 const char *principal;
392                 const char *endpoint;
393
394                 principal = gensec_get_target_principal(s->pipe->conn->security_state.generic_state);
395                 if (principal == NULL) {
396                         const char *hostname = gensec_get_target_hostname(s->pipe->conn->security_state.generic_state);
397                         const char *service  = gensec_get_target_service(s->pipe->conn->security_state.generic_state);
398                         if (hostname != NULL && service != NULL) {
399                                 principal = talloc_asprintf(c, "%s/%s", service, hostname);
400                         }
401                 }
402
403                 endpoint = dcerpc_binding_get_string_option(s->binding, "endpoint");
404
405                 if ((cli_credentials_failed_kerberos_login(s->credentials, principal, &s->logon_retries) ||
406                      cli_credentials_wrong_password(s->credentials)) &&
407                     endpoint != NULL) {
408                         /*
409                          * Retry SPNEGO with a better password
410                          * send a request for secondary rpc connection
411                          */
412                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
413                                                                         s->binding);
414                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
415                         return;
416                 }
417         }
418
419         if (!composite_is_ok(c)) return;
420
421         composite_done(c);
422 }
423
424 /*
425   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
426   rpc connection (the first one can't be used any more, due to the
427   bind nak) and perform authenticated bind request
428 */
429 static void continue_ntlmssp_connection(struct composite_context *ctx)
430 {
431         struct composite_context *c;
432         struct pipe_auth_state *s;
433         struct composite_context *auth_req;
434         struct dcerpc_pipe *p2;
435         void *pp;
436
437         c = talloc_get_type(ctx->async.private_data, struct composite_context);
438         s = talloc_get_type(c->private_data, struct pipe_auth_state);
439
440         /* receive secondary rpc connection */
441         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
442         if (!composite_is_ok(c)) return;
443
444
445         /* this is a rather strange situation. When
446            we come into the routine, s is a child of s->pipe, and
447            when we created p2 above, it also became a child of
448            s->pipe.
449
450            Now we want p2 to be a parent of s->pipe, and we want s to
451            be a parent of both of them! If we don't do this very
452            carefully we end up creating a talloc loop
453         */
454
455         /* we need the new contexts to hang off the same context
456            that s->pipe is on, but the only way to get that is
457            via talloc_parent() */
458         pp = talloc_parent(s->pipe);
459
460         /* promote s to be at the top */
461         talloc_steal(pp, s);
462
463         /* and put p2 under s */
464         talloc_steal(s, p2);
465
466         /* now put s->pipe under p2 */
467         talloc_steal(p2, s->pipe);
468
469         s->pipe = p2;
470
471         /* initiate a authenticated bind */
472         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
473                                          s->credentials, 
474                                          lpcfg_gensec_settings(c, s->lp_ctx),
475                                          DCERPC_AUTH_TYPE_NTLMSSP,
476                                          dcerpc_auth_level(s->pipe->conn),
477                                          s->table->authservices->names[0]);
478         composite_continue(c, auth_req, continue_auth, c);
479 }
480
481 /*
482   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
483   rpc connection (the first one can't be used any more, due to the
484   bind nak) and perform authenticated bind request
485 */
486 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
487 {
488         struct composite_context *c;
489         struct pipe_auth_state *s;
490         struct composite_context *auth_req;
491         struct dcerpc_pipe *p2;
492
493         c = talloc_get_type(ctx->async.private_data, struct composite_context);
494         s = talloc_get_type(c->private_data, struct pipe_auth_state);
495
496         /* receive secondary rpc connection */
497         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
498         if (!composite_is_ok(c)) return;
499
500         talloc_steal(s, p2);
501         talloc_steal(p2, s->pipe);
502         s->pipe = p2;
503
504         /* initiate a authenticated bind */
505         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
506                                          s->credentials, 
507                                          lpcfg_gensec_settings(c, s->lp_ctx),
508                                          DCERPC_AUTH_TYPE_SPNEGO,
509                                          dcerpc_auth_level(s->pipe->conn),
510                                          s->table->authservices->names[0]);
511         composite_continue(c, auth_req, continue_auth, c);
512 }
513
514
515 /*
516   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
517 */
518 static void continue_auth_none(struct composite_context *ctx)
519 {
520         struct composite_context *c = talloc_get_type(ctx->async.private_data,
521                                                       struct composite_context);
522
523         c->status = dcerpc_bind_auth_none_recv(ctx);
524         if (!composite_is_ok(c)) return;
525         
526         composite_done(c);
527 }
528
529
530 /*
531   Request to perform an authenticated bind if required. Authentication
532   is determined using credentials passed and binding flags.
533 */
534 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p, 
535                                                 const struct dcerpc_binding *binding,
536                                                 const struct ndr_interface_table *table,
537                                                 struct cli_credentials *credentials,
538                                                 struct loadparm_context *lp_ctx)
539 {
540         struct composite_context *c;
541         struct pipe_auth_state *s;
542         struct composite_context *auth_schannel_req;
543         struct composite_context *auth_req;
544         struct composite_context *auth_none_req;
545         struct dcecli_connection *conn;
546         uint8_t auth_type;
547
548         /* composite context allocation and setup */
549         c = composite_create(p, p->conn->event_ctx);
550         if (c == NULL) return NULL;
551
552         s = talloc_zero(c, struct pipe_auth_state);
553         if (composite_nomem(s, c)) return c;
554         c->private_data = s;
555
556         /* store parameters in state structure */
557         s->binding      = binding;
558         s->table        = table;
559         s->credentials  = credentials;
560         s->pipe         = p;
561         s->lp_ctx       = lp_ctx;
562
563         conn = s->pipe->conn;
564         conn->flags = dcerpc_binding_get_flags(binding);
565
566         if (DEBUGLVL(100)) {
567                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
568         }
569
570         if (conn->transport.transport == NCALRPC) {
571                 const char *v = dcerpc_binding_get_string_option(binding,
572                                                         "auth_type");
573
574                 if (v != NULL && strcmp(v, "ncalrpc_as_system") == 0) {
575                         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
576                                                  s->credentials,
577                                                  lpcfg_gensec_settings(c, s->lp_ctx),
578                                                  DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM,
579                                                  DCERPC_AUTH_LEVEL_CONNECT,
580                                                  s->table->authservices->names[0]);
581                         composite_continue(c, auth_req, continue_auth, c);
582                         return c;
583                 }
584         }
585
586         if (cli_credentials_is_anonymous(s->credentials)) {
587                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
588                 composite_continue(c, auth_none_req, continue_auth_none, c);
589                 return c;
590         }
591
592         if ((conn->flags & DCERPC_SCHANNEL) &&
593             !cli_credentials_get_netlogon_creds(s->credentials)) {
594                 /* If we don't already have netlogon credentials for
595                  * the schannel bind, then we have to get these
596                  * first */
597                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
598                                                                    s->credentials, s->lp_ctx,
599                                                                    dcerpc_auth_level(conn));
600                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
601                 return c;
602         }
603
604         /*
605          * we rely on the already authenticated CIFS connection
606          * if not doing sign or seal
607          */
608         if (conn->transport.transport == NCACN_NP &&
609             !(conn->flags & (DCERPC_PACKET|DCERPC_SIGN|DCERPC_SEAL))) {
610                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
611                 composite_continue(c, auth_none_req, continue_auth_none, c);
612                 return c;
613         }
614
615
616         /* Perform an authenticated DCE-RPC bind
617          */
618         if (!(conn->flags & (DCERPC_CONNECT|DCERPC_SEAL|DCERPC_PACKET))) {
619                 /*
620                   we are doing an authenticated connection,
621                   which needs to use [connect], [sign] or [seal].
622                   If nothing is specified, we default to [sign] now.
623                   This give roughly the same protection as
624                   ncacn_np with smb signing.
625                 */
626                 conn->flags |= DCERPC_SIGN;
627         }
628
629         if (conn->flags & DCERPC_AUTH_SPNEGO) {
630                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
631
632         } else if (conn->flags & DCERPC_AUTH_KRB5) {
633                 auth_type = DCERPC_AUTH_TYPE_KRB5;
634
635         } else if (conn->flags & DCERPC_SCHANNEL) {
636                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
637
638         } else if (conn->flags & DCERPC_AUTH_NTLM) {
639                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
640
641         } else {
642                 /* try SPNEGO with fallback to NTLMSSP */
643                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
644                                                  s->credentials, 
645                                                  lpcfg_gensec_settings(c, s->lp_ctx),
646                                                  DCERPC_AUTH_TYPE_SPNEGO,
647                                                  dcerpc_auth_level(conn),
648                                                  s->table->authservices->names[0]);
649                 composite_continue(c, auth_req, continue_auth_auto, c);
650                 return c;
651         }
652
653         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
654                                          s->credentials, 
655                                          lpcfg_gensec_settings(c, s->lp_ctx),
656                                          auth_type,
657                                          dcerpc_auth_level(conn),
658                                          s->table->authservices->names[0]);
659         composite_continue(c, auth_req, continue_auth, c);
660         return c;
661 }
662
663
664 /*
665   Receive result of authenticated bind request on dcerpc pipe
666
667   This returns *p, which may be different to the one originally
668   supllied, as it rebinds to a new pipe due to authentication fallback
669
670 */
671 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx, 
672                                struct dcerpc_pipe **p)
673 {
674         NTSTATUS status;
675
676         struct pipe_auth_state *s = talloc_get_type(c->private_data,
677                                                     struct pipe_auth_state);
678         status = composite_wait(c);
679         if (!NT_STATUS_IS_OK(status)) {
680                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
681                 DEBUG(0, ("Failed to bind to uuid %s for %s %s\n", uuid_str,
682                           dcerpc_binding_string(uuid_str, s->binding), nt_errstr(status)));
683                 talloc_free(uuid_str);
684         } else {
685                 talloc_steal(mem_ctx, s->pipe);
686                 *p = s->pipe;
687         }
688
689         talloc_free(c);
690         return status;
691 }
692
693
694 /* 
695    Perform an authenticated bind if needed - sync version
696
697    This may change *p, as it rebinds to a new pipe due to authentication fallback
698 */
699 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
700                           struct dcerpc_pipe **p, 
701                           const struct dcerpc_binding *binding,
702                           const struct ndr_interface_table *table,
703                           struct cli_credentials *credentials,
704                           struct loadparm_context *lp_ctx)
705 {
706         struct composite_context *c;
707
708         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
709         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
710 }
711
712
713 NTSTATUS dcecli_generic_session_key(struct dcecli_connection *c,
714                                     DATA_BLOB *session_key)
715 {
716         if (c != NULL) {
717                 if (c->transport.transport != NCALRPC &&
718                     c->transport.transport != NCACN_UNIX_STREAM)
719                 {
720                         return NT_STATUS_LOCAL_USER_SESSION_KEY;
721                 }
722         }
723
724         return dcerpc_generic_session_key(session_key);
725 }
726
727 /*
728   fetch the user session key - may be default (above) or the SMB session key
729
730   The key is always truncated to 16 bytes 
731 */
732 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
733                                            DATA_BLOB *session_key)
734 {
735         NTSTATUS status;
736         status = p->conn->security_state.session_key(p->conn, session_key);
737         if (!NT_STATUS_IS_OK(status)) {
738                 return status;
739         }
740
741         session_key->length = MIN(session_key->length, 16);
742
743         return NT_STATUS_OK;
744 }
745
746 /*
747   create a secondary context from a primary connection
748
749   this uses dcerpc_alter_context() to create a new dcerpc context_id
750 */
751 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p, 
752                                   struct dcerpc_pipe **pp2,
753                                   const struct ndr_interface_table *table)
754 {
755         NTSTATUS status;
756         struct dcerpc_pipe *p2;
757         struct GUID *object = NULL;
758         
759         p2 = talloc_zero(p, struct dcerpc_pipe);
760         if (p2 == NULL) {
761                 return NT_STATUS_NO_MEMORY;
762         }
763         p2->conn = talloc_reference(p2, p->conn);
764         p2->request_timeout = p->request_timeout;
765
766         p2->context_id = ++p->conn->next_context_id;
767
768         p2->syntax = table->syntax_id;
769
770         p2->transfer_syntax = p->transfer_syntax;
771
772         p2->binding = dcerpc_binding_dup(p2, p->binding);
773         if (p2->binding == NULL) {
774                 talloc_free(p2);
775                 return NT_STATUS_NO_MEMORY;
776         }
777
778         p2->object = dcerpc_binding_get_object(p2->binding);
779         if (!GUID_all_zero(&p2->object)) {
780                 object = &p2->object;
781         }
782
783         p2->binding_handle = dcerpc_pipe_binding_handle(p2, object, table);
784         if (p2->binding_handle == NULL) {
785                 talloc_free(p2);
786                 return NT_STATUS_NO_MEMORY;
787         }
788
789         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
790         if (!NT_STATUS_IS_OK(status)) {
791                 talloc_free(p2);
792                 return status;
793         }
794
795         *pp2 = p2;
796
797         return NT_STATUS_OK;
798 }