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/>.
25 #include "auth/auth.h"
26 #include "libcli/composite/composite.h"
27 #include "libcli/auth/libcli_auth.h"
28 #include "librpc/gen_ndr/ndr_netlogon.h"
29 #include "librpc/gen_ndr/ndr_netlogon_c.h"
30 #include "auth/credentials/credentials.h"
31 #include "librpc/rpc/dcerpc_proto.h"
33 struct schannel_key_state {
34 struct dcerpc_pipe *pipe;
35 struct dcerpc_pipe *pipe2;
36 struct dcerpc_binding *binding;
37 struct cli_credentials *credentials;
38 struct creds_CredentialState *creds;
39 uint32_t negotiate_flags;
40 struct netr_Credential credentials1;
41 struct netr_Credential credentials2;
42 struct netr_Credential credentials3;
43 struct netr_ServerReqChallenge r;
44 struct netr_ServerAuthenticate2 a;
45 const struct samr_Password *mach_pwd;
49 static void continue_secondary_connection(struct composite_context *ctx);
50 static void continue_bind_auth_none(struct composite_context *ctx);
51 static void continue_srv_challenge(struct rpc_request *req);
52 static void continue_srv_auth2(struct rpc_request *req);
56 Stage 2 of schannel_key: Receive endpoint mapping and request secondary
59 static void continue_epm_map_binding(struct composite_context *ctx)
61 struct composite_context *c;
62 struct schannel_key_state *s;
63 struct composite_context *sec_conn_req;
65 c = talloc_get_type(ctx->async.private_data, struct composite_context);
66 s = talloc_get_type(c->private_data, struct schannel_key_state);
68 /* receive endpoint mapping */
69 c->status = dcerpc_epm_map_binding_recv(ctx);
70 if (!NT_STATUS_IS_OK(c->status)) {
71 DEBUG(0,("Failed to map DCERPC/TCP NCACN_NP pipe for '%s' - %s\n",
72 NDR_NETLOGON_UUID, nt_errstr(c->status)));
73 composite_error(c, c->status);
77 /* send a request for secondary rpc connection */
78 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
80 if (composite_nomem(sec_conn_req, c)) return;
82 composite_continue(c, sec_conn_req, continue_secondary_connection, c);
87 Stage 3 of schannel_key: Receive secondary rpc connection and perform
88 non-authenticated bind request
90 static void continue_secondary_connection(struct composite_context *ctx)
92 struct composite_context *c;
93 struct schannel_key_state *s;
94 struct composite_context *auth_none_req;
96 c = talloc_get_type(ctx->async.private_data, struct composite_context);
97 s = talloc_get_type(c->private_data, struct schannel_key_state);
99 /* receive secondary rpc connection */
100 c->status = dcerpc_secondary_connection_recv(ctx, &s->pipe2);
101 if (!composite_is_ok(c)) return;
103 talloc_steal(s, s->pipe2);
105 /* initiate a non-authenticated bind */
106 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe2, &ndr_table_netlogon);
107 if (composite_nomem(auth_none_req, c)) return;
109 composite_continue(c, auth_none_req, continue_bind_auth_none, c);
114 Stage 4 of schannel_key: Receive non-authenticated bind and get
117 static void continue_bind_auth_none(struct composite_context *ctx)
119 struct composite_context *c;
120 struct schannel_key_state *s;
121 struct rpc_request *srv_challenge_req;
123 c = talloc_get_type(ctx->async.private_data, struct composite_context);
124 s = talloc_get_type(c->private_data, struct schannel_key_state);
126 /* receive result of non-authenticated bind request */
127 c->status = dcerpc_bind_auth_none_recv(ctx);
128 if (!composite_is_ok(c)) return;
130 /* prepare a challenge request */
131 s->r.in.server_name = talloc_asprintf(c, "\\\\%s", dcerpc_server_name(s->pipe));
132 if (composite_nomem(s->r.in.server_name, c)) return;
133 s->r.in.computer_name = cli_credentials_get_workstation(s->credentials);
134 s->r.in.credentials = &s->credentials1;
135 s->r.out.return_credentials = &s->credentials2;
137 generate_random_buffer(s->credentials1.data, sizeof(s->credentials1.data));
140 request a netlogon challenge - a rpc request over opened secondary pipe
142 srv_challenge_req = dcerpc_netr_ServerReqChallenge_send(s->pipe2, c, &s->r);
143 if (composite_nomem(srv_challenge_req, c)) return;
145 composite_continue_rpc(c, srv_challenge_req, continue_srv_challenge, c);
150 Stage 5 of schannel_key: Receive a challenge and perform authentication
153 static void continue_srv_challenge(struct rpc_request *req)
155 struct composite_context *c;
156 struct schannel_key_state *s;
157 struct rpc_request *srv_auth2_req;
159 c = talloc_get_type(req->async.private_data, struct composite_context);
160 s = talloc_get_type(c->private_data, struct schannel_key_state);
162 /* receive rpc request result - netlogon challenge */
163 c->status = dcerpc_ndr_request_recv(req);
164 if (!composite_is_ok(c)) return;
166 /* prepare credentials for auth2 request */
167 s->mach_pwd = cli_credentials_get_nt_hash(s->credentials, c);
169 creds_client_init(s->creds, &s->credentials1, &s->credentials2,
170 s->mach_pwd, &s->credentials3, s->negotiate_flags);
172 /* auth2 request arguments */
173 s->a.in.server_name = s->r.in.server_name;
174 s->a.in.account_name = cli_credentials_get_username(s->credentials);
175 s->a.in.secure_channel_type =
176 cli_credentials_get_secure_channel_type(s->credentials);
177 s->a.in.computer_name = cli_credentials_get_workstation(s->credentials);
178 s->a.in.negotiate_flags = &s->negotiate_flags;
179 s->a.in.credentials = &s->credentials3;
180 s->a.out.negotiate_flags = &s->negotiate_flags;
181 s->a.out.return_credentials = &s->credentials3;
184 authenticate on the netlogon pipe - a rpc request over secondary pipe
186 srv_auth2_req = dcerpc_netr_ServerAuthenticate2_send(s->pipe2, c, &s->a);
187 if (composite_nomem(srv_auth2_req, c)) return;
189 composite_continue_rpc(c, srv_auth2_req, continue_srv_auth2, c);
194 Stage 6 of schannel_key: Receive authentication request result and verify
197 static void continue_srv_auth2(struct rpc_request *req)
199 struct composite_context *c;
200 struct schannel_key_state *s;
202 c = talloc_get_type(req->async.private_data, struct composite_context);
203 s = talloc_get_type(c->private_data, struct schannel_key_state);
205 /* receive rpc request result - auth2 credentials */
206 c->status = dcerpc_ndr_request_recv(req);
207 if (!composite_is_ok(c)) return;
209 /* verify credentials */
210 if (!creds_client_check(s->creds, s->a.out.return_credentials)) {
211 composite_error(c, NT_STATUS_UNSUCCESSFUL);
215 /* setup current netlogon credentials */
216 cli_credentials_set_netlogon_creds(s->credentials, s->creds);
223 Initiate establishing a schannel key using netlogon challenge
226 struct composite_context *dcerpc_schannel_key_send(TALLOC_CTX *mem_ctx,
227 struct dcerpc_pipe *p,
228 struct cli_credentials *credentials,
229 struct loadparm_context *lp_ctx)
231 struct composite_context *c;
232 struct schannel_key_state *s;
233 struct composite_context *epm_map_req;
235 /* composite context allocation and setup */
236 c = composite_create(mem_ctx, p->conn->event_ctx);
237 if (c == NULL) return NULL;
239 s = talloc_zero(c, struct schannel_key_state);
240 if (composite_nomem(s, c)) return c;
243 /* store parameters in the state structure */
245 s->credentials = credentials;
247 /* allocate credentials */
248 s->creds = talloc(c, struct creds_CredentialState);
249 if (composite_nomem(s->creds, c)) return c;
251 /* type of authentication depends on schannel type */
252 if (s->pipe->conn->flags & DCERPC_SCHANNEL_128) {
253 s->negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
255 s->negotiate_flags = NETLOGON_NEG_AUTH2_FLAGS;
258 /* allocate binding structure */
259 s->binding = talloc(c, struct dcerpc_binding);
260 if (composite_nomem(s->binding, c)) return c;
262 *s->binding = *s->pipe->binding;
264 /* request the netlogon endpoint mapping */
265 epm_map_req = dcerpc_epm_map_binding_send(c, s->binding,
267 s->pipe->conn->event_ctx,
269 if (composite_nomem(epm_map_req, c)) return c;
271 composite_continue(c, epm_map_req, continue_epm_map_binding, c);
277 Receive result of schannel key request
279 NTSTATUS dcerpc_schannel_key_recv(struct composite_context *c)
281 NTSTATUS status = composite_wait(c);
288 struct auth_schannel_state {
289 struct dcerpc_pipe *pipe;
290 struct cli_credentials *credentials;
291 const struct ndr_interface_table *table;
292 struct loadparm_context *lp_ctx;
297 static void continue_bind_auth(struct composite_context *ctx);
301 Stage 2 of auth_schannel: Receive schannel key and intitiate an
302 authenticated bind using received credentials
304 static void continue_schannel_key(struct composite_context *ctx)
306 struct composite_context *auth_req;
307 struct composite_context *c = talloc_get_type(ctx->async.private_data,
308 struct composite_context);
309 struct auth_schannel_state *s = talloc_get_type(c->private_data,
310 struct auth_schannel_state);
312 /* receive schannel key */
313 c->status = dcerpc_schannel_key_recv(ctx);
314 if (!composite_is_ok(c)) {
315 DEBUG(1, ("Failed to setup credentials for account %s: %s\n",
316 cli_credentials_get_username(s->credentials), nt_errstr(c->status)));
320 /* send bind auth request with received creds */
321 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table, s->credentials,
323 DCERPC_AUTH_TYPE_SCHANNEL, s->auth_level,
325 if (composite_nomem(auth_req, c)) return;
327 composite_continue(c, auth_req, continue_bind_auth, c);
332 Stage 3 of auth_schannel: Receivce result of authenticated bind
333 and say if we're done ok.
335 static void continue_bind_auth(struct composite_context *ctx)
337 struct composite_context *c = talloc_get_type(ctx->async.private_data,
338 struct composite_context);
340 c->status = dcerpc_bind_auth_recv(ctx);
341 if (!composite_is_ok(c)) return;
348 Initiate schannel authentication request
350 struct composite_context *dcerpc_bind_auth_schannel_send(TALLOC_CTX *tmp_ctx,
351 struct dcerpc_pipe *p,
352 const struct ndr_interface_table *table,
353 struct cli_credentials *credentials,
354 struct loadparm_context *lp_ctx,
357 struct composite_context *c;
358 struct auth_schannel_state *s;
359 struct composite_context *schan_key_req;
361 /* composite context allocation and setup */
362 c = composite_create(tmp_ctx, p->conn->event_ctx);
363 if (c == NULL) return NULL;
365 s = talloc_zero(c, struct auth_schannel_state);
366 if (composite_nomem(s, c)) return c;
369 /* store parameters in the state structure */
371 s->credentials = credentials;
373 s->auth_level = auth_level;
376 /* start getting schannel key first */
377 schan_key_req = dcerpc_schannel_key_send(c, p, credentials, lp_ctx);
378 if (composite_nomem(schan_key_req, c)) return c;
380 composite_continue(c, schan_key_req, continue_schannel_key, c);
386 Receive result of schannel authentication request
388 NTSTATUS dcerpc_bind_auth_schannel_recv(struct composite_context *c)
390 NTSTATUS status = composite_wait(c);
398 Perform schannel authenticated bind - sync version
400 _PUBLIC_ NTSTATUS dcerpc_bind_auth_schannel(TALLOC_CTX *tmp_ctx,
401 struct dcerpc_pipe *p,
402 const struct ndr_interface_table *table,
403 struct cli_credentials *credentials,
404 struct loadparm_context *lp_ctx,
407 struct composite_context *c;
409 c = dcerpc_bind_auth_schannel_send(tmp_ctx, p, table, credentials, lp_ctx,
411 return dcerpc_bind_auth_schannel_recv(c);