531647def80e465ee84ceb6e6a0ac47180615884
[kai/samba.git] / source4 / winbind / wb_init_domain.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    A composite API for initializing a domain
5
6    Copyright (C) Volker Lendecke 2005
7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 3 of the License, or
12    (at your option) any later version.
13    
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18    
19    You should have received a copy of the GNU General Public License
20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "libcli/composite/composite.h"
25 #include "libcli/smb_composite/smb_composite.h"
26 #include "winbind/wb_server.h"
27 #include "winbind/wb_async_helpers.h"
28 #include "winbind/wb_helper.h"
29 #include "smbd/service_task.h"
30 #include "librpc/gen_ndr/ndr_netlogon.h"
31 #include "librpc/gen_ndr/ndr_lsa_c.h"
32 #include "librpc/gen_ndr/ndr_samr_c.h"
33 #include "libcli/libcli.h"
34
35 #include "libcli/auth/credentials.h"
36 #include "libcli/security/security.h"
37
38 #include "libcli/ldap/ldap_client.h"
39
40 #include "auth/credentials/credentials.h"
41 #include "param/param.h"
42
43 /*
44  * Initialize a domain:
45  *
46  * - With schannel credentials, try to open the SMB connection and
47  *   NETLOGON pipe with the machine creds. This works against W2k3SP1
48  *   with an NTLMSSP session setup. Fall back to anonymous (for the CIFS level).
49  *
50  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
51  *   pipe.
52  *
53  * - Open LSA. If we have machine creds, try to open with SPNEGO or NTLMSSP. Fall back
54  *   to schannel.
55  *
56  * - With queryinfopolicy, verify that we're talking to the right domain
57  *
58  * A bit complex, but with all the combinations I think it's the best we can
59  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
60  * have a signed&sealed lsa connection on all of them.
61  *
62  * Not sure if it is overkill, but it seems to work.
63  */
64
65 struct init_domain_state {
66         struct composite_context *ctx;
67         struct wbsrv_domain *domain;
68         struct wbsrv_service *service;
69
70         struct lsa_ObjectAttribute objectattr;
71         struct lsa_OpenPolicy2 lsa_openpolicy;
72         struct lsa_QueryInfoPolicy queryinfo;
73         union lsa_PolicyInformation *info;
74 };
75
76 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
77 static void init_domain_recv_lsa_pipe(struct composite_context *ctx);
78 static void init_domain_recv_lsa_policy(struct rpc_request *req);
79 static void init_domain_recv_queryinfo(struct rpc_request *req);
80 static void init_domain_recv_samr(struct composite_context *ctx);
81
82 static struct dcerpc_binding *init_domain_binding(struct init_domain_state *state, 
83                                                   const struct ndr_interface_table *table) 
84 {
85         struct dcerpc_binding *binding;
86         NTSTATUS status;
87
88         /* Make a binding string */
89         {
90                 char *s = talloc_asprintf(state, "ncacn_np:%s", state->domain->dc_name);
91                 if (s == NULL) return NULL;
92                 status = dcerpc_parse_binding(state, s, &binding);
93                 talloc_free(s);
94                 if (!NT_STATUS_IS_OK(status)) {
95                         return NULL;
96                 }
97         }
98
99         /* Alter binding to contain hostname, but also address (so we don't look it up twice) */
100         binding->target_hostname = state->domain->dc_name;
101         binding->host = state->domain->dc_address;
102
103         /* This shouldn't make a network call, as the mappings for named pipes are well known */
104         status = dcerpc_epm_map_binding(binding, binding, table, state->service->task->event_ctx,
105                                         state->service->task->lp_ctx);
106         if (!NT_STATUS_IS_OK(status)) {
107                 return NULL;
108         }
109
110         return binding;
111 }
112
113 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
114                                               struct wbsrv_service *service,
115                                               struct wb_dom_info *dom_info)
116 {
117         struct composite_context *result, *ctx;
118         struct init_domain_state *state;
119
120         result = composite_create(mem_ctx, service->task->event_ctx);
121         if (result == NULL) goto failed;
122
123         state = talloc_zero(result, struct init_domain_state);
124         if (state == NULL) goto failed;
125         state->ctx = result;
126         result->private_data = state;
127
128         state->service = service;
129
130         state->domain = talloc(state, struct wbsrv_domain);
131         if (state->domain == NULL) goto failed;
132
133         state->domain->info = talloc_reference(state->domain, dom_info);
134         if (state->domain->info == NULL) goto failed;
135
136         /* Caller should check, but to be safe: */
137         if (dom_info->num_dcs < 1) {
138                 goto failed;
139         }
140         
141         /* For now, we just pick the first.  The next step will be to
142          * walk the entire list.  Also need to fix finddcs() to return
143          * the entire list */
144         state->domain->dc_name = dom_info->dcs[0].name;
145         state->domain->dc_address = dom_info->dcs[0].address;
146
147         state->domain->libnet_ctx = libnet_context_init(service->task->event_ctx, 
148                                                         service->task->lp_ctx);
149
150         /* Create a credentials structure */
151         state->domain->libnet_ctx->cred = cli_credentials_init(state->domain);
152         if (state->domain->libnet_ctx->cred == NULL) goto failed;
153
154         cli_credentials_set_conf(state->domain->libnet_ctx->cred, service->task->lp_ctx);
155
156         /* Connect the machine account to the credentials */
157         state->ctx->status =
158                 cli_credentials_set_machine_account(state->domain->libnet_ctx->cred, state->domain->libnet_ctx->lp_ctx);
159         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
160
161         state->domain->netlogon_binding = init_domain_binding(state, &ndr_table_netlogon);
162
163         state->domain->netlogon_pipe = NULL;
164
165         if ((!cli_credentials_is_anonymous(state->domain->libnet_ctx->cred)) &&
166             ((lp_server_role(service->task->lp_ctx) == ROLE_DOMAIN_MEMBER) ||
167              (lp_server_role(service->task->lp_ctx) == ROLE_DOMAIN_CONTROLLER)) &&
168             (dom_sid_equal(state->domain->info->sid,
169                            state->service->primary_sid))) {
170                 state->domain->netlogon_binding->flags |= DCERPC_SCHANNEL;
171
172                 /* For debugging, it can be a real pain if all the traffic is encrypted */
173                 if (lp_winbind_sealed_pipes(service->task->lp_ctx)) {
174                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
175                 } else {
176                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN);
177                 }
178         }
179
180         /* No encryption on anonymous pipes */
181
182         ctx = dcerpc_pipe_connect_b_send(state, state->domain->netlogon_binding, 
183                                          &ndr_table_netlogon,
184                                          state->domain->libnet_ctx->cred,
185                                          service->task->event_ctx,
186                                          service->task->lp_ctx);
187         
188         if (composite_nomem(ctx, state->ctx)) {
189                 goto failed;
190         }
191         
192         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
193                            state);
194         return result;
195  failed:
196         talloc_free(result);
197         return NULL;
198 }
199
200 /* Having make a netlogon connection (possibly secured with schannel),
201  * make an LSA connection to the same DC, on the same IPC$ share */
202 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
203 {
204         struct init_domain_state *state =
205                 talloc_get_type(ctx->async.private_data,
206                                 struct init_domain_state);
207
208         state->ctx->status = dcerpc_pipe_connect_b_recv(ctx, state->domain, 
209                                                    &state->domain->netlogon_pipe);
210         
211         if (!composite_is_ok(state->ctx)) {
212                 return;
213         }
214         talloc_steal(state->domain->netlogon_pipe, state->domain->netlogon_binding);
215
216         state->domain->lsa_binding = init_domain_binding(state, &ndr_table_lsarpc);
217
218         /* For debugging, it can be a real pain if all the traffic is encrypted */
219         if (lp_winbind_sealed_pipes(state->service->task->lp_ctx)) {
220                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
221         } else {
222                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
223         }
224
225         state->domain->libnet_ctx->lsa.pipe = NULL;
226
227         /* this will make the secondary connection on the same IPC$ share, 
228            secured with SPNEGO or NTLMSSP */
229         ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
230                                                     state->domain->lsa_binding,
231                                                     &ndr_table_lsarpc,
232                                                     state->domain->libnet_ctx->cred,
233                                                     state->domain->libnet_ctx->lp_ctx
234                 );
235         composite_continue(state->ctx, ctx, init_domain_recv_lsa_pipe, state);
236 }
237
238 static bool retry_with_schannel(struct init_domain_state *state, 
239                                 struct dcerpc_binding *binding,
240                                 const struct ndr_interface_table *table,
241                                 void (*continuation)(struct composite_context *))
242 {
243         struct composite_context *ctx;
244         state->ctx->status = NT_STATUS_OK;
245         if (state->domain->netlogon_binding->flags & DCERPC_SCHANNEL 
246             && !(binding->flags & DCERPC_SCHANNEL)) {
247                 /* Opening a policy handle failed, perhaps it was
248                  * because we don't get a 'wrong password' error on
249                  * NTLMSSP binds */
250
251                 /* Try again with schannel */
252                 binding->flags |= DCERPC_SCHANNEL;
253
254                 /* Try again, likewise on the same IPC$ share, 
255                    secured with SCHANNEL */
256                 ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
257                                                             binding,
258                                                             table, 
259                                                             state->domain->libnet_ctx->cred,
260                                                             state->domain->libnet_ctx->lp_ctx);
261                 composite_continue(state->ctx, ctx, continuation, state);               
262                 return true;
263         } else {
264                 return false;
265         }
266 }
267 /* We should now have either an authenticated LSA pipe, or an error.  
268  * On success, open a policy handle
269  */     
270 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
271 {
272         struct rpc_request *req;
273         struct init_domain_state *state =
274                 talloc_get_type(ctx->async.private_data,
275                                 struct init_domain_state);
276
277         state->ctx->status = dcerpc_secondary_auth_connection_recv(ctx, state->domain,
278                                                                    &state->domain->libnet_ctx->lsa.pipe);
279         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
280                 if (retry_with_schannel(state, state->domain->lsa_binding, 
281                                         &ndr_table_lsarpc,
282                                         init_domain_recv_lsa_pipe)) {
283                         return;
284                 }
285         }
286         if (!composite_is_ok(state->ctx)) return;
287
288         talloc_steal(state->domain->libnet_ctx, state->domain->libnet_ctx->lsa.pipe);
289         talloc_steal(state->domain->libnet_ctx->lsa.pipe, state->domain->lsa_binding);
290         state->domain->libnet_ctx->lsa.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
291         state->domain->libnet_ctx->lsa.name = state->domain->info->name;
292
293         ZERO_STRUCT(state->domain->libnet_ctx->lsa.handle);
294         state->lsa_openpolicy.in.system_name =
295                 talloc_asprintf(state, "\\\\%s",
296                                 dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe));
297         ZERO_STRUCT(state->objectattr);
298         state->lsa_openpolicy.in.attr = &state->objectattr;
299         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
300         state->lsa_openpolicy.out.handle = &state->domain->libnet_ctx->lsa.handle;
301
302         req = dcerpc_lsa_OpenPolicy2_send(state->domain->libnet_ctx->lsa.pipe, state,
303                                           &state->lsa_openpolicy);
304
305         composite_continue_rpc(state->ctx, req, init_domain_recv_lsa_policy, state);
306 }
307
308 /* Receive a policy handle (or not, and retry the authentication) and
309  * obtain some basic information about the domain */
310
311 static void init_domain_recv_lsa_policy(struct rpc_request *req)
312 {
313         struct init_domain_state *state =
314                 talloc_get_type(req->async.private_data,
315                                 struct init_domain_state);
316
317         state->ctx->status = dcerpc_ndr_request_recv(req);
318         if ((!NT_STATUS_IS_OK(state->ctx->status)
319               || !NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
320                 if (retry_with_schannel(state, state->domain->lsa_binding, 
321                                         &ndr_table_lsarpc,
322                                         init_domain_recv_lsa_pipe)) {
323                         return;
324                 }
325         }
326         if (!composite_is_ok(state->ctx)) return;
327         state->ctx->status = state->lsa_openpolicy.out.result;
328         if (!composite_is_ok(state->ctx)) return;
329
330         state->info = talloc_zero(state->ctx, union lsa_PolicyInformation);
331         if (composite_nomem(state->info, state->ctx)) return;
332
333         state->queryinfo.in.handle = &state->domain->libnet_ctx->lsa.handle;
334         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
335         state->queryinfo.out.info = &state->info;
336
337         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->libnet_ctx->lsa.pipe, state,
338                                               &state->queryinfo);
339         composite_continue_rpc(state->ctx, req,
340                                init_domain_recv_queryinfo, state);
341 }
342
343 static void init_domain_recv_queryinfo(struct rpc_request *req)
344 {
345         struct init_domain_state *state =
346                 talloc_get_type(req->async.private_data, struct init_domain_state);
347         struct lsa_DomainInfo *dominfo;
348         struct composite_context *ctx;
349
350         state->ctx->status = dcerpc_ndr_request_recv(req);
351         if (!composite_is_ok(state->ctx)) return;
352         state->ctx->status = state->queryinfo.out.result;
353         if (!composite_is_ok(state->ctx)) return;
354
355         dominfo = &(*state->queryinfo.out.info)->account_domain;
356
357         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
358                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
359                           state->domain->info->name,
360                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
361                           dominfo->name.string));
362                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
363                 return;
364         }
365
366         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
367                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
368                           dom_sid_string(state, state->domain->info->sid),
369                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
370                           dom_sid_string(state, dominfo->sid)));
371                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
372                 return;
373         }
374
375         state->domain->samr_binding = init_domain_binding(state, &ndr_table_samr);
376
377         /* We want to use the same flags as the LSA pipe did (so, if
378          * it needed schannel, then we need that here too) */
379         state->domain->samr_binding->flags = state->domain->lsa_binding->flags;
380
381         state->domain->libnet_ctx->samr.pipe = NULL;
382
383         ctx = wb_connect_samr_send(state, state->domain);
384         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
385 }
386
387 /* Recv the SAMR details (SamrConnect and SamrOpenDomain handle) and
388  * open an LDAP connection */
389 static void init_domain_recv_samr(struct composite_context *ctx)
390 {
391         const char *ldap_url;
392         struct init_domain_state *state =
393                 talloc_get_type(ctx->async.private_data,
394                                 struct init_domain_state);
395
396         state->ctx->status = wb_connect_samr_recv(
397                 ctx, state->domain,
398                 &state->domain->libnet_ctx->samr.pipe,
399                 &state->domain->libnet_ctx->samr.handle, 
400                 &state->domain->libnet_ctx->samr.handle);
401         if (!composite_is_ok(state->ctx)) return;
402
403         talloc_steal(state->domain->libnet_ctx->samr.pipe, state->domain->samr_binding);
404         state->domain->libnet_ctx->samr.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
405         state->domain->libnet_ctx->samr.name = state->domain->info->name;
406         state->domain->libnet_ctx->samr.sid = state->domain->info->sid;
407
408         composite_done(state->ctx);
409 }
410
411 NTSTATUS wb_init_domain_recv(struct composite_context *c,
412                              TALLOC_CTX *mem_ctx,
413                              struct wbsrv_domain **result)
414 {
415         NTSTATUS status = composite_wait(c);
416         if (NT_STATUS_IS_OK(status)) {
417                 struct init_domain_state *state =
418                         talloc_get_type(c->private_data,
419                                         struct init_domain_state);
420                 *result = talloc_steal(mem_ctx, state->domain);
421         }
422         talloc_free(c);
423         return status;
424 }
425
426 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
427                         struct wb_dom_info *dom_info,
428                         struct wbsrv_domain **result)
429 {
430         struct composite_context *c =
431                 wb_init_domain_send(mem_ctx, service, dom_info);
432         return wb_init_domain_recv(c, mem_ctx, result);
433 }