s4:winbind/wb_init_domain: use DCERPC_SCHANNEL_128 in order to work against w2k8r2
[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 "winbind/wb_server.h"
26 #include "smbd/service_task.h"
27 #include "librpc/gen_ndr/ndr_netlogon.h"
28 #include "librpc/gen_ndr/ndr_lsa_c.h"
29 #include "librpc/gen_ndr/ndr_samr_c.h"
30 #include "libcli/libcli.h"
31
32 #include "libcli/security/security.h"
33
34
35 #include "auth/credentials/credentials.h"
36 #include "param/param.h"
37
38 /*
39  * Initialize a domain:
40  *
41  * - With schannel credentials, try to open the SMB connection and
42  *   NETLOGON pipe with the machine creds. This works against W2k3SP1
43  *   with an NTLMSSP session setup. Fall back to anonymous (for the CIFS level).
44  *
45  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
46  *   pipe.
47  *
48  * - Open LSA. If we have machine creds, try to open with SPNEGO or NTLMSSP. Fall back
49  *   to schannel.
50  *
51  * - With queryinfopolicy, verify that we're talking to the right domain
52  *
53  * A bit complex, but with all the combinations I think it's the best we can
54  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
55  * have a signed&sealed lsa connection on all of them.
56  *
57  * Not sure if it is overkill, but it seems to work.
58  */
59
60 struct init_domain_state {
61         struct composite_context *ctx;
62         struct wbsrv_domain *domain;
63         struct wbsrv_service *service;
64
65         struct lsa_ObjectAttribute objectattr;
66         struct lsa_OpenPolicy2 lsa_openpolicy;
67         struct lsa_QueryInfoPolicy queryinfo;
68         union lsa_PolicyInformation *info;
69 };
70
71 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
72 static void init_domain_recv_lsa_pipe(struct composite_context *ctx);
73 static void init_domain_recv_lsa_policy(struct tevent_req *subreq);
74 static void init_domain_recv_queryinfo(struct tevent_req *subreq);
75 static void init_domain_recv_samr(struct composite_context *ctx);
76
77 static struct dcerpc_binding *init_domain_binding(struct init_domain_state *state, 
78                                                   const struct ndr_interface_table *table) 
79 {
80         struct dcerpc_binding *binding;
81         NTSTATUS status;
82
83         /* Make a binding string */
84         {
85                 char *s = talloc_asprintf(state, "ncacn_np:%s", state->domain->dc_name);
86                 if (s == NULL) return NULL;
87                 status = dcerpc_parse_binding(state, s, &binding);
88                 talloc_free(s);
89                 if (!NT_STATUS_IS_OK(status)) {
90                         return NULL;
91                 }
92         }
93
94         /* Alter binding to contain hostname, but also address (so we don't look it up twice) */
95         binding->target_hostname = state->domain->dc_name;
96         binding->host = state->domain->dc_address;
97
98         /* This shouldn't make a network call, as the mappings for named pipes are well known */
99         status = dcerpc_epm_map_binding(binding, binding, table, state->service->task->event_ctx,
100                                         state->service->task->lp_ctx);
101         if (!NT_STATUS_IS_OK(status)) {
102                 return NULL;
103         }
104
105         return binding;
106 }
107
108 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
109                                               struct wbsrv_service *service,
110                                               struct wb_dom_info *dom_info)
111 {
112         struct composite_context *result, *ctx;
113         struct init_domain_state *state;
114
115         result = composite_create(mem_ctx, service->task->event_ctx);
116         if (result == NULL) goto failed;
117
118         state = talloc_zero(result, struct init_domain_state);
119         if (state == NULL) goto failed;
120         state->ctx = result;
121         result->private_data = state;
122
123         state->service = service;
124
125         state->domain = talloc(state, struct wbsrv_domain);
126         if (state->domain == NULL) goto failed;
127
128         state->domain->info = talloc_reference(state->domain, dom_info);
129         if (state->domain->info == NULL) goto failed;
130
131         state->domain->dc_name = dom_info->dc->name;
132         state->domain->dc_address = dom_info->dc->address;
133
134         state->domain->libnet_ctx = libnet_context_init(service->task->event_ctx, 
135                                                         service->task->lp_ctx);
136
137         /* Create a credentials structure */
138         state->domain->libnet_ctx->cred = cli_credentials_init(state->domain);
139         if (state->domain->libnet_ctx->cred == NULL) goto failed;
140
141         cli_credentials_set_conf(state->domain->libnet_ctx->cred, service->task->lp_ctx);
142
143         /* Connect the machine account to the credentials */
144         state->ctx->status =
145                 cli_credentials_set_machine_account(state->domain->libnet_ctx->cred, state->domain->libnet_ctx->lp_ctx);
146         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
147
148         state->domain->netlogon_binding = init_domain_binding(state, &ndr_table_netlogon);
149
150         state->domain->netlogon_pipe = NULL;
151
152         if ((!cli_credentials_is_anonymous(state->domain->libnet_ctx->cred)) &&
153             ((lpcfg_server_role(service->task->lp_ctx) == ROLE_DOMAIN_MEMBER) ||
154              (lpcfg_server_role(service->task->lp_ctx) == ROLE_DOMAIN_CONTROLLER)) &&
155             (dom_sid_equal(state->domain->info->sid,
156                            state->service->primary_sid))) {
157                 state->domain->netlogon_binding->flags |= DCERPC_SCHANNEL | DCERPC_SCHANNEL_128;
158
159                 /* For debugging, it can be a real pain if all the traffic is encrypted */
160                 if (lpcfg_winbind_sealed_pipes(service->task->lp_ctx)) {
161                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
162                 } else {
163                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN);
164                 }
165         }
166
167         /* No encryption on anonymous pipes */
168
169         ctx = dcerpc_pipe_connect_b_send(state, state->domain->netlogon_binding, 
170                                          &ndr_table_netlogon,
171                                          state->domain->libnet_ctx->cred,
172                                          service->task->event_ctx,
173                                          service->task->lp_ctx);
174         
175         if (composite_nomem(ctx, state->ctx)) {
176                 goto failed;
177         }
178         
179         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
180                            state);
181         return result;
182  failed:
183         talloc_free(result);
184         return NULL;
185 }
186
187 /* Having make a netlogon connection (possibly secured with schannel),
188  * make an LSA connection to the same DC, on the same IPC$ share */
189 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
190 {
191         struct init_domain_state *state =
192                 talloc_get_type(ctx->async.private_data,
193                                 struct init_domain_state);
194
195         state->ctx->status = dcerpc_pipe_connect_b_recv(ctx, state->domain, 
196                                                    &state->domain->netlogon_pipe);
197         
198         if (!composite_is_ok(state->ctx)) {
199                 return;
200         }
201         talloc_reparent(state, state->domain->netlogon_pipe, state->domain->netlogon_binding);
202
203         state->domain->lsa_binding = init_domain_binding(state, &ndr_table_lsarpc);
204
205         /* For debugging, it can be a real pain if all the traffic is encrypted */
206         if (lpcfg_winbind_sealed_pipes(state->service->task->lp_ctx)) {
207                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
208         } else {
209                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
210         }
211
212         state->domain->libnet_ctx->lsa.pipe = NULL;
213
214         /* this will make the secondary connection on the same IPC$ share, 
215            secured with SPNEGO or NTLMSSP */
216         ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
217                                                     state->domain->lsa_binding,
218                                                     &ndr_table_lsarpc,
219                                                     state->domain->libnet_ctx->cred,
220                                                     state->domain->libnet_ctx->lp_ctx
221                 );
222         composite_continue(state->ctx, ctx, init_domain_recv_lsa_pipe, state);
223 }
224
225 static bool retry_with_schannel(struct init_domain_state *state, 
226                                 struct dcerpc_binding *binding,
227                                 const struct ndr_interface_table *table,
228                                 void (*continuation)(struct composite_context *))
229 {
230         struct composite_context *ctx;
231         state->ctx->status = NT_STATUS_OK;
232         if (state->domain->netlogon_binding->flags & DCERPC_SCHANNEL 
233             && !(binding->flags & DCERPC_SCHANNEL)) {
234                 /* Opening a policy handle failed, perhaps it was
235                  * because we don't get a 'wrong password' error on
236                  * NTLMSSP binds */
237
238                 /* Try again with schannel */
239                 binding->flags |= DCERPC_SCHANNEL;
240
241                 /* Try again, likewise on the same IPC$ share, 
242                    secured with SCHANNEL */
243                 ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
244                                                             binding,
245                                                             table, 
246                                                             state->domain->libnet_ctx->cred,
247                                                             state->domain->libnet_ctx->lp_ctx);
248                 composite_continue(state->ctx, ctx, continuation, state);               
249                 return true;
250         } else {
251                 return false;
252         }
253 }
254 /* We should now have either an authenticated LSA pipe, or an error.  
255  * On success, open a policy handle
256  */     
257 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
258 {
259         struct init_domain_state *state =
260                 talloc_get_type(ctx->async.private_data,
261                                 struct init_domain_state);
262         struct tevent_req *subreq;
263
264         state->ctx->status = dcerpc_secondary_auth_connection_recv(ctx, state->domain,
265                                                                    &state->domain->libnet_ctx->lsa.pipe);
266         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
267                 if (retry_with_schannel(state, state->domain->lsa_binding, 
268                                         &ndr_table_lsarpc,
269                                         init_domain_recv_lsa_pipe)) {
270                         return;
271                 }
272         }
273         if (!composite_is_ok(state->ctx)) return;
274
275         talloc_steal(state->domain->libnet_ctx, state->domain->libnet_ctx->lsa.pipe);
276         talloc_reparent(state, state->domain->libnet_ctx->lsa.pipe, state->domain->lsa_binding);
277         state->domain->libnet_ctx->lsa.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
278         state->domain->libnet_ctx->lsa.name = state->domain->info->name;
279
280         ZERO_STRUCT(state->domain->libnet_ctx->lsa.handle);
281         state->lsa_openpolicy.in.system_name =
282                 talloc_asprintf(state, "\\\\%s",
283                                 dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe));
284         ZERO_STRUCT(state->objectattr);
285         state->lsa_openpolicy.in.attr = &state->objectattr;
286         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
287         state->lsa_openpolicy.out.handle = &state->domain->libnet_ctx->lsa.handle;
288
289         subreq = dcerpc_lsa_OpenPolicy2_r_send(state,
290                                                state->ctx->event_ctx,
291                                                state->domain->libnet_ctx->lsa.pipe->binding_handle,
292                                                &state->lsa_openpolicy);
293         if (composite_nomem(subreq, state->ctx)) return;
294         tevent_req_set_callback(subreq, init_domain_recv_lsa_policy, state);
295 }
296
297 /* Receive a policy handle (or not, and retry the authentication) and
298  * obtain some basic information about the domain */
299
300 static void init_domain_recv_lsa_policy(struct tevent_req *subreq)
301 {
302         struct init_domain_state *state =
303                 tevent_req_callback_data(subreq,
304                 struct init_domain_state);
305
306         state->ctx->status = dcerpc_lsa_OpenPolicy2_r_recv(subreq, state);
307         TALLOC_FREE(subreq);
308         if ((!NT_STATUS_IS_OK(state->ctx->status)
309               || !NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
310                 if (retry_with_schannel(state, state->domain->lsa_binding, 
311                                         &ndr_table_lsarpc,
312                                         init_domain_recv_lsa_pipe)) {
313                         return;
314                 }
315         }
316         if (!composite_is_ok(state->ctx)) return;
317         state->ctx->status = state->lsa_openpolicy.out.result;
318         if (!composite_is_ok(state->ctx)) return;
319
320         state->info = talloc_zero(state->ctx, union lsa_PolicyInformation);
321         if (composite_nomem(state->info, state->ctx)) return;
322
323         state->queryinfo.in.handle = &state->domain->libnet_ctx->lsa.handle;
324         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
325         state->queryinfo.out.info = &state->info;
326
327         subreq = dcerpc_lsa_QueryInfoPolicy_r_send(state,
328                                                    state->ctx->event_ctx,
329                                                    state->domain->libnet_ctx->lsa.pipe->binding_handle,
330                                                    &state->queryinfo);
331         if (composite_nomem(subreq, state->ctx)) return;
332         tevent_req_set_callback(subreq, init_domain_recv_queryinfo, state);
333 }
334
335 static void init_domain_recv_queryinfo(struct tevent_req *subreq)
336 {
337         struct init_domain_state *state =
338                 tevent_req_callback_data(subreq,
339                 struct init_domain_state);
340         struct lsa_DomainInfo *dominfo;
341         struct composite_context *ctx;
342
343         state->ctx->status = dcerpc_lsa_QueryInfoPolicy_r_recv(subreq, state);
344         TALLOC_FREE(subreq);
345         if (!composite_is_ok(state->ctx)) return;
346         state->ctx->status = state->queryinfo.out.result;
347         if (!composite_is_ok(state->ctx)) return;
348
349         dominfo = &(*state->queryinfo.out.info)->account_domain;
350
351         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
352                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
353                           state->domain->info->name,
354                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
355                           dominfo->name.string));
356                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
357                 return;
358         }
359
360         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
361                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
362                           dom_sid_string(state, state->domain->info->sid),
363                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
364                           dom_sid_string(state, dominfo->sid)));
365                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
366                 return;
367         }
368
369         state->domain->samr_binding = init_domain_binding(state, &ndr_table_samr);
370
371         /* We want to use the same flags as the LSA pipe did (so, if
372          * it needed schannel, then we need that here too) */
373         state->domain->samr_binding->flags = state->domain->lsa_binding->flags;
374
375         state->domain->libnet_ctx->samr.pipe = NULL;
376
377         ctx = wb_connect_samr_send(state, state->domain);
378         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
379 }
380
381 /* Recv the SAMR details (SamrConnect and SamrOpenDomain handle) and
382  * open an LDAP connection */
383 static void init_domain_recv_samr(struct composite_context *ctx)
384 {
385         struct init_domain_state *state =
386                 talloc_get_type(ctx->async.private_data,
387                                 struct init_domain_state);
388
389         state->ctx->status = wb_connect_samr_recv(
390                 ctx, state->domain,
391                 &state->domain->libnet_ctx->samr.pipe,
392                 &state->domain->libnet_ctx->samr.connect_handle,
393                 &state->domain->libnet_ctx->samr.handle);
394         if (!composite_is_ok(state->ctx)) return;
395
396         talloc_reparent(state, state->domain->libnet_ctx->samr.pipe, state->domain->samr_binding);
397         state->domain->libnet_ctx->samr.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
398         state->domain->libnet_ctx->samr.name = state->domain->info->name;
399         state->domain->libnet_ctx->samr.sid = dom_sid_dup(
400                                                 state->domain->libnet_ctx,
401                                                 state->domain->info->sid);
402
403         composite_done(state->ctx);
404 }
405
406 NTSTATUS wb_init_domain_recv(struct composite_context *c,
407                              TALLOC_CTX *mem_ctx,
408                              struct wbsrv_domain **result)
409 {
410         NTSTATUS status = composite_wait(c);
411         if (NT_STATUS_IS_OK(status)) {
412                 struct init_domain_state *state =
413                         talloc_get_type(c->private_data,
414                                         struct init_domain_state);
415                 *result = talloc_steal(mem_ctx, state->domain);
416         }
417         talloc_free(c);
418         return status;
419 }
420
421 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
422                         struct wb_dom_info *dom_info,
423                         struct wbsrv_domain **result)
424 {
425         struct composite_context *c =
426                 wb_init_domain_send(mem_ctx, service, dom_info);
427         return wb_init_domain_recv(c, mem_ctx, result);
428 }