2 Unix SMB/CIFS implementation.
4 dcerpc schannel operations
6 Copyright (C) Andrew Tridgell 2004
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
8 Copyright (C) Rafal Szczesniak 2006
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include "auth/auth.h"
27 #include "libcli/composite/composite.h"
28 #include "libcli/auth/libcli_auth.h"
29 #include "librpc/gen_ndr/ndr_netlogon.h"
30 #include "librpc/gen_ndr/ndr_netlogon_c.h"
31 #include "auth/credentials/credentials.h"
32 #include "librpc/rpc/dcerpc_proto.h"
33 #include "param/param.h"
35 struct schannel_key_state
{
36 struct dcerpc_pipe
*pipe
;
37 struct dcerpc_pipe
*pipe2
;
38 struct dcerpc_binding
*binding
;
39 struct cli_credentials
*credentials
;
40 struct netlogon_creds_CredentialState
*creds
;
41 uint32_t negotiate_flags
;
42 struct netr_Credential credentials1
;
43 struct netr_Credential credentials2
;
44 struct netr_Credential credentials3
;
45 struct netr_ServerReqChallenge r
;
46 struct netr_ServerAuthenticate2 a
;
47 const struct samr_Password
*mach_pwd
;
51 static void continue_secondary_connection(struct composite_context
*ctx
);
52 static void continue_bind_auth_none(struct composite_context
*ctx
);
53 static void continue_srv_challenge(struct tevent_req
*subreq
);
54 static void continue_srv_auth2(struct tevent_req
*subreq
);
58 Stage 2 of schannel_key: Receive endpoint mapping and request secondary
61 static void continue_epm_map_binding(struct composite_context
*ctx
)
63 struct composite_context
*c
;
64 struct schannel_key_state
*s
;
65 struct composite_context
*sec_conn_req
;
67 c
= talloc_get_type(ctx
->async
.private_data
, struct composite_context
);
68 s
= talloc_get_type(c
->private_data
, struct schannel_key_state
);
70 /* receive endpoint mapping */
71 c
->status
= dcerpc_epm_map_binding_recv(ctx
);
72 if (!NT_STATUS_IS_OK(c
->status
)) {
73 DEBUG(0,("Failed to map DCERPC/TCP NCACN_NP pipe for '%s' - %s\n",
74 NDR_NETLOGON_UUID
, nt_errstr(c
->status
)));
75 composite_error(c
, c
->status
);
79 /* send a request for secondary rpc connection */
80 sec_conn_req
= dcerpc_secondary_connection_send(s
->pipe
,
82 if (composite_nomem(sec_conn_req
, c
)) return;
84 composite_continue(c
, sec_conn_req
, continue_secondary_connection
, c
);
89 Stage 3 of schannel_key: Receive secondary rpc connection and perform
90 non-authenticated bind request
92 static void continue_secondary_connection(struct composite_context
*ctx
)
94 struct composite_context
*c
;
95 struct schannel_key_state
*s
;
96 struct composite_context
*auth_none_req
;
98 c
= talloc_get_type(ctx
->async
.private_data
, struct composite_context
);
99 s
= talloc_get_type(c
->private_data
, struct schannel_key_state
);
101 /* receive secondary rpc connection */
102 c
->status
= dcerpc_secondary_connection_recv(ctx
, &s
->pipe2
);
103 if (!composite_is_ok(c
)) return;
105 talloc_steal(s
, s
->pipe2
);
107 /* initiate a non-authenticated bind */
108 auth_none_req
= dcerpc_bind_auth_none_send(c
, s
->pipe2
, &ndr_table_netlogon
);
109 if (composite_nomem(auth_none_req
, c
)) return;
111 composite_continue(c
, auth_none_req
, continue_bind_auth_none
, c
);
116 Stage 4 of schannel_key: Receive non-authenticated bind and get
119 static void continue_bind_auth_none(struct composite_context
*ctx
)
121 struct composite_context
*c
;
122 struct schannel_key_state
*s
;
123 struct tevent_req
*subreq
;
125 c
= talloc_get_type(ctx
->async
.private_data
, struct composite_context
);
126 s
= talloc_get_type(c
->private_data
, struct schannel_key_state
);
128 /* receive result of non-authenticated bind request */
129 c
->status
= dcerpc_bind_auth_none_recv(ctx
);
130 if (!composite_is_ok(c
)) return;
132 /* prepare a challenge request */
133 s
->r
.in
.server_name
= talloc_asprintf(c
, "\\\\%s", dcerpc_server_name(s
->pipe
));
134 if (composite_nomem(s
->r
.in
.server_name
, c
)) return;
135 s
->r
.in
.computer_name
= cli_credentials_get_workstation(s
->credentials
);
136 s
->r
.in
.credentials
= &s
->credentials1
;
137 s
->r
.out
.return_credentials
= &s
->credentials2
;
139 generate_random_buffer(s
->credentials1
.data
, sizeof(s
->credentials1
.data
));
142 request a netlogon challenge - a rpc request over opened secondary pipe
144 subreq
= dcerpc_netr_ServerReqChallenge_r_send(s
, c
->event_ctx
,
145 s
->pipe2
->binding_handle
,
147 if (composite_nomem(subreq
, c
)) return;
149 tevent_req_set_callback(subreq
, continue_srv_challenge
, c
);
154 Stage 5 of schannel_key: Receive a challenge and perform authentication
157 static void continue_srv_challenge(struct tevent_req
*subreq
)
159 struct composite_context
*c
;
160 struct schannel_key_state
*s
;
162 c
= tevent_req_callback_data(subreq
, struct composite_context
);
163 s
= talloc_get_type(c
->private_data
, struct schannel_key_state
);
165 /* receive rpc request result - netlogon challenge */
166 c
->status
= dcerpc_netr_ServerReqChallenge_r_recv(subreq
, s
);
168 if (!composite_is_ok(c
)) return;
170 /* prepare credentials for auth2 request */
171 s
->mach_pwd
= cli_credentials_get_nt_hash(s
->credentials
, c
);
173 /* auth2 request arguments */
174 s
->a
.in
.server_name
= s
->r
.in
.server_name
;
175 s
->a
.in
.account_name
= cli_credentials_get_username(s
->credentials
);
176 s
->a
.in
.secure_channel_type
=
177 cli_credentials_get_secure_channel_type(s
->credentials
);
178 s
->a
.in
.computer_name
= cli_credentials_get_workstation(s
->credentials
);
179 s
->a
.in
.negotiate_flags
= &s
->negotiate_flags
;
180 s
->a
.in
.credentials
= &s
->credentials3
;
181 s
->a
.out
.negotiate_flags
= &s
->negotiate_flags
;
182 s
->a
.out
.return_credentials
= &s
->credentials3
;
184 s
->creds
= netlogon_creds_client_init(s
,
185 s
->a
.in
.account_name
,
186 s
->a
.in
.computer_name
,
187 &s
->credentials1
, &s
->credentials2
,
188 s
->mach_pwd
, &s
->credentials3
, s
->negotiate_flags
);
189 if (composite_nomem(s
->creds
, c
)) {
193 authenticate on the netlogon pipe - a rpc request over secondary pipe
195 subreq
= dcerpc_netr_ServerAuthenticate2_r_send(s
, c
->event_ctx
,
196 s
->pipe2
->binding_handle
,
198 if (composite_nomem(subreq
, c
)) return;
200 tevent_req_set_callback(subreq
, continue_srv_auth2
, c
);
205 Stage 6 of schannel_key: Receive authentication request result and verify
208 static void continue_srv_auth2(struct tevent_req
*subreq
)
210 struct composite_context
*c
;
211 struct schannel_key_state
*s
;
213 c
= tevent_req_callback_data(subreq
, struct composite_context
);
214 s
= talloc_get_type(c
->private_data
, struct schannel_key_state
);
216 /* receive rpc request result - auth2 credentials */
217 c
->status
= dcerpc_netr_ServerAuthenticate2_r_recv(subreq
, s
);
219 if (!composite_is_ok(c
)) return;
221 /* verify credentials */
222 if (!netlogon_creds_client_check(s
->creds
, s
->a
.out
.return_credentials
)) {
223 composite_error(c
, NT_STATUS_UNSUCCESSFUL
);
227 /* setup current netlogon credentials */
228 cli_credentials_set_netlogon_creds(s
->credentials
, s
->creds
);
235 Initiate establishing a schannel key using netlogon challenge
238 struct composite_context
*dcerpc_schannel_key_send(TALLOC_CTX
*mem_ctx
,
239 struct dcerpc_pipe
*p
,
240 struct cli_credentials
*credentials
,
241 struct loadparm_context
*lp_ctx
)
243 struct composite_context
*c
;
244 struct schannel_key_state
*s
;
245 struct composite_context
*epm_map_req
;
246 enum netr_SchannelType schannel_type
= cli_credentials_get_secure_channel_type(credentials
);
248 /* composite context allocation and setup */
249 c
= composite_create(mem_ctx
, p
->conn
->event_ctx
);
250 if (c
== NULL
) return NULL
;
252 s
= talloc_zero(c
, struct schannel_key_state
);
253 if (composite_nomem(s
, c
)) return c
;
256 /* store parameters in the state structure */
258 s
->credentials
= credentials
;
260 /* allocate credentials */
261 /* type of authentication depends on schannel type */
262 if (schannel_type
== SEC_CHAN_RODC
) {
263 s
->negotiate_flags
= NETLOGON_NEG_AUTH2_RODC_FLAGS
;
264 } else if (s
->pipe
->conn
->flags
& DCERPC_SCHANNEL_128
) {
265 s
->negotiate_flags
= NETLOGON_NEG_AUTH2_ADS_FLAGS
;
267 s
->negotiate_flags
= NETLOGON_NEG_AUTH2_FLAGS
;
270 /* allocate binding structure */
271 s
->binding
= talloc_zero(c
, struct dcerpc_binding
);
272 if (composite_nomem(s
->binding
, c
)) return c
;
274 *s
->binding
= *s
->pipe
->binding
;
276 /* request the netlogon endpoint mapping */
277 epm_map_req
= dcerpc_epm_map_binding_send(c
, s
->binding
,
279 s
->pipe
->conn
->event_ctx
,
281 if (composite_nomem(epm_map_req
, c
)) return c
;
283 composite_continue(c
, epm_map_req
, continue_epm_map_binding
, c
);
289 Receive result of schannel key request
291 NTSTATUS
dcerpc_schannel_key_recv(struct composite_context
*c
)
293 NTSTATUS status
= composite_wait(c
);
300 struct auth_schannel_state
{
301 struct dcerpc_pipe
*pipe
;
302 struct cli_credentials
*credentials
;
303 const struct ndr_interface_table
*table
;
304 struct loadparm_context
*lp_ctx
;
309 static void continue_bind_auth(struct composite_context
*ctx
);
313 Stage 2 of auth_schannel: Receive schannel key and intitiate an
314 authenticated bind using received credentials
316 static void continue_schannel_key(struct composite_context
*ctx
)
318 struct composite_context
*auth_req
;
319 struct composite_context
*c
= talloc_get_type(ctx
->async
.private_data
,
320 struct composite_context
);
321 struct auth_schannel_state
*s
= talloc_get_type(c
->private_data
,
322 struct auth_schannel_state
);
325 /* receive schannel key */
326 status
= c
->status
= dcerpc_schannel_key_recv(ctx
);
327 if (!composite_is_ok(c
)) {
328 DEBUG(1, ("Failed to setup credentials: %s\n", nt_errstr(status
)));
332 /* send bind auth request with received creds */
333 auth_req
= dcerpc_bind_auth_send(c
, s
->pipe
, s
->table
, s
->credentials
,
334 lpcfg_gensec_settings(c
, s
->lp_ctx
),
335 DCERPC_AUTH_TYPE_SCHANNEL
, s
->auth_level
,
337 if (composite_nomem(auth_req
, c
)) return;
339 composite_continue(c
, auth_req
, continue_bind_auth
, c
);
344 Stage 3 of auth_schannel: Receivce result of authenticated bind
345 and say if we're done ok.
347 static void continue_bind_auth(struct composite_context
*ctx
)
349 struct composite_context
*c
= talloc_get_type(ctx
->async
.private_data
,
350 struct composite_context
);
352 c
->status
= dcerpc_bind_auth_recv(ctx
);
353 if (!composite_is_ok(c
)) return;
360 Initiate schannel authentication request
362 struct composite_context
*dcerpc_bind_auth_schannel_send(TALLOC_CTX
*tmp_ctx
,
363 struct dcerpc_pipe
*p
,
364 const struct ndr_interface_table
*table
,
365 struct cli_credentials
*credentials
,
366 struct loadparm_context
*lp_ctx
,
369 struct composite_context
*c
;
370 struct auth_schannel_state
*s
;
371 struct composite_context
*schan_key_req
;
373 /* composite context allocation and setup */
374 c
= composite_create(tmp_ctx
, p
->conn
->event_ctx
);
375 if (c
== NULL
) return NULL
;
377 s
= talloc_zero(c
, struct auth_schannel_state
);
378 if (composite_nomem(s
, c
)) return c
;
381 /* store parameters in the state structure */
383 s
->credentials
= credentials
;
385 s
->auth_level
= auth_level
;
388 /* start getting schannel key first */
389 schan_key_req
= dcerpc_schannel_key_send(c
, p
, credentials
, lp_ctx
);
390 if (composite_nomem(schan_key_req
, c
)) return c
;
392 composite_continue(c
, schan_key_req
, continue_schannel_key
, c
);
398 Receive result of schannel authentication request
400 NTSTATUS
dcerpc_bind_auth_schannel_recv(struct composite_context
*c
)
402 NTSTATUS status
= composite_wait(c
);
410 Perform schannel authenticated bind - sync version
412 _PUBLIC_ NTSTATUS
dcerpc_bind_auth_schannel(TALLOC_CTX
*tmp_ctx
,
413 struct dcerpc_pipe
*p
,
414 const struct ndr_interface_table
*table
,
415 struct cli_credentials
*credentials
,
416 struct loadparm_context
*lp_ctx
,
419 struct composite_context
*c
;
421 c
= dcerpc_bind_auth_schannel_send(tmp_ctx
, p
, table
, credentials
, lp_ctx
,
423 return dcerpc_bind_auth_schannel_recv(c
);