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 bool dcerpc_schannel_auto;
40 struct cli_credentials *credentials;
41 struct netlogon_creds_CredentialState *creds;
42 uint32_t local_negotiate_flags;
43 uint32_t remote_negotiate_flags;
44 struct netr_Credential credentials1;
45 struct netr_Credential credentials2;
46 struct netr_Credential credentials3;
47 struct netr_ServerReqChallenge r;
48 struct netr_ServerAuthenticate2 a;
49 const struct samr_Password *mach_pwd;
53 static void continue_secondary_connection(struct composite_context *ctx);
54 static void continue_bind_auth_none(struct composite_context *ctx);
55 static void continue_srv_challenge(struct tevent_req *subreq);
56 static void continue_srv_auth2(struct tevent_req *subreq);
57 static void continue_get_capabilities(struct tevent_req *subreq);
61 Stage 2 of schannel_key: Receive endpoint mapping and request secondary
64 static void continue_epm_map_binding(struct composite_context *ctx)
66 struct composite_context *c;
67 struct schannel_key_state *s;
68 struct composite_context *sec_conn_req;
70 c = talloc_get_type(ctx->async.private_data, struct composite_context);
71 s = talloc_get_type(c->private_data, struct schannel_key_state);
73 /* receive endpoint mapping */
74 c->status = dcerpc_epm_map_binding_recv(ctx);
75 if (!NT_STATUS_IS_OK(c->status)) {
76 DEBUG(0,("Failed to map DCERPC/TCP NCACN_NP pipe for '%s' - %s\n",
77 NDR_NETLOGON_UUID, nt_errstr(c->status)));
78 composite_error(c, c->status);
82 /* send a request for secondary rpc connection */
83 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
85 if (composite_nomem(sec_conn_req, c)) return;
87 composite_continue(c, sec_conn_req, continue_secondary_connection, c);
92 Stage 3 of schannel_key: Receive secondary rpc connection and perform
93 non-authenticated bind request
95 static void continue_secondary_connection(struct composite_context *ctx)
97 struct composite_context *c;
98 struct schannel_key_state *s;
99 struct composite_context *auth_none_req;
101 c = talloc_get_type(ctx->async.private_data, struct composite_context);
102 s = talloc_get_type(c->private_data, struct schannel_key_state);
104 /* receive secondary rpc connection */
105 c->status = dcerpc_secondary_connection_recv(ctx, &s->pipe2);
106 if (!composite_is_ok(c)) return;
108 talloc_steal(s, s->pipe2);
110 /* initiate a non-authenticated bind */
111 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe2, &ndr_table_netlogon);
112 if (composite_nomem(auth_none_req, c)) return;
114 composite_continue(c, auth_none_req, continue_bind_auth_none, c);
119 Stage 4 of schannel_key: Receive non-authenticated bind and get
122 static void continue_bind_auth_none(struct composite_context *ctx)
124 struct composite_context *c;
125 struct schannel_key_state *s;
126 struct tevent_req *subreq;
128 c = talloc_get_type(ctx->async.private_data, struct composite_context);
129 s = talloc_get_type(c->private_data, struct schannel_key_state);
131 /* receive result of non-authenticated bind request */
132 c->status = dcerpc_bind_auth_none_recv(ctx);
133 if (!composite_is_ok(c)) return;
135 /* prepare a challenge request */
136 s->r.in.server_name = talloc_asprintf(c, "\\\\%s", dcerpc_server_name(s->pipe));
137 if (composite_nomem(s->r.in.server_name, c)) return;
138 s->r.in.computer_name = cli_credentials_get_workstation(s->credentials);
139 s->r.in.credentials = &s->credentials1;
140 s->r.out.return_credentials = &s->credentials2;
142 generate_random_buffer(s->credentials1.data, sizeof(s->credentials1.data));
145 request a netlogon challenge - a rpc request over opened secondary pipe
147 subreq = dcerpc_netr_ServerReqChallenge_r_send(s, c->event_ctx,
148 s->pipe2->binding_handle,
150 if (composite_nomem(subreq, c)) return;
152 tevent_req_set_callback(subreq, continue_srv_challenge, c);
157 Stage 5 of schannel_key: Receive a challenge and perform authentication
160 static void continue_srv_challenge(struct tevent_req *subreq)
162 struct composite_context *c;
163 struct schannel_key_state *s;
165 c = tevent_req_callback_data(subreq, struct composite_context);
166 s = talloc_get_type(c->private_data, struct schannel_key_state);
168 /* receive rpc request result - netlogon challenge */
169 c->status = dcerpc_netr_ServerReqChallenge_r_recv(subreq, s);
171 if (!composite_is_ok(c)) return;
173 /* prepare credentials for auth2 request */
174 s->mach_pwd = cli_credentials_get_nt_hash(s->credentials, c);
176 /* auth2 request arguments */
177 s->a.in.server_name = s->r.in.server_name;
178 s->a.in.account_name = cli_credentials_get_username(s->credentials);
179 s->a.in.secure_channel_type =
180 cli_credentials_get_secure_channel_type(s->credentials);
181 s->a.in.computer_name = cli_credentials_get_workstation(s->credentials);
182 s->a.in.negotiate_flags = &s->local_negotiate_flags;
183 s->a.in.credentials = &s->credentials3;
184 s->a.out.negotiate_flags = &s->remote_negotiate_flags;
185 s->a.out.return_credentials = &s->credentials3;
187 s->creds = netlogon_creds_client_init(s,
188 s->a.in.account_name,
189 s->a.in.computer_name,
190 s->a.in.secure_channel_type,
191 &s->credentials1, &s->credentials2,
192 s->mach_pwd, &s->credentials3,
193 s->local_negotiate_flags);
194 if (composite_nomem(s->creds, c)) {
198 authenticate on the netlogon pipe - a rpc request over secondary pipe
200 subreq = dcerpc_netr_ServerAuthenticate2_r_send(s, c->event_ctx,
201 s->pipe2->binding_handle,
203 if (composite_nomem(subreq, c)) return;
205 tevent_req_set_callback(subreq, continue_srv_auth2, c);
210 Stage 6 of schannel_key: Receive authentication request result and verify
213 static void continue_srv_auth2(struct tevent_req *subreq)
215 struct composite_context *c;
216 struct schannel_key_state *s;
218 c = tevent_req_callback_data(subreq, struct composite_context);
219 s = talloc_get_type(c->private_data, struct schannel_key_state);
221 /* receive rpc request result - auth2 credentials */
222 c->status = dcerpc_netr_ServerAuthenticate2_r_recv(subreq, s);
224 if (!composite_is_ok(c)) return;
226 if (!NT_STATUS_EQUAL(s->a.out.result, NT_STATUS_ACCESS_DENIED) &&
227 !NT_STATUS_IS_OK(s->a.out.result)) {
228 composite_error(c, s->a.out.result);
233 * Strong keys could be unsupported (NT4) or disables. So retry with the
234 * flags returned by the server. - asn
236 if (NT_STATUS_EQUAL(s->a.out.result, NT_STATUS_ACCESS_DENIED)) {
237 uint32_t lf = s->local_negotiate_flags;
238 const char *ln = NULL;
239 uint32_t rf = s->remote_negotiate_flags;
240 const char *rn = NULL;
242 if (!s->dcerpc_schannel_auto) {
243 composite_error(c, s->a.out.result);
246 s->dcerpc_schannel_auto = false;
248 if (lf & NETLOGON_NEG_SUPPORTS_AES) {
250 if (rf & NETLOGON_NEG_SUPPORTS_AES) {
251 composite_error(c, s->a.out.result);
254 } else if (lf & NETLOGON_NEG_STRONG_KEYS) {
256 if (rf & NETLOGON_NEG_STRONG_KEYS) {
257 composite_error(c, s->a.out.result);
264 if (rf & NETLOGON_NEG_SUPPORTS_AES) {
266 } else if (rf & NETLOGON_NEG_STRONG_KEYS) {
272 DEBUG(3, ("Server doesn't support %s keys, downgrade to %s"
273 "and retry! local[0x%08X] remote[0x%08X]\n",
276 s->local_negotiate_flags = s->remote_negotiate_flags;
278 generate_random_buffer(s->credentials1.data,
279 sizeof(s->credentials1.data));
281 subreq = dcerpc_netr_ServerReqChallenge_r_send(s,
283 s->pipe2->binding_handle,
285 if (composite_nomem(subreq, c)) return;
287 tevent_req_set_callback(subreq, continue_srv_challenge, c);
291 s->creds->negotiate_flags = s->remote_negotiate_flags;
293 /* verify credentials */
294 if (!netlogon_creds_client_check(s->creds, s->a.out.return_credentials)) {
295 composite_error(c, NT_STATUS_UNSUCCESSFUL);
303 Initiate establishing a schannel key using netlogon challenge
306 static struct composite_context *dcerpc_schannel_key_send(TALLOC_CTX *mem_ctx,
307 struct dcerpc_pipe *p,
308 struct cli_credentials *credentials,
309 struct loadparm_context *lp_ctx)
311 struct composite_context *c;
312 struct schannel_key_state *s;
313 struct composite_context *epm_map_req;
314 enum netr_SchannelType schannel_type = cli_credentials_get_secure_channel_type(credentials);
316 /* composite context allocation and setup */
317 c = composite_create(mem_ctx, p->conn->event_ctx);
318 if (c == NULL) return NULL;
320 s = talloc_zero(c, struct schannel_key_state);
321 if (composite_nomem(s, c)) return c;
324 /* store parameters in the state structure */
326 s->credentials = credentials;
327 s->local_negotiate_flags = NETLOGON_NEG_AUTH2_FLAGS;
329 /* allocate credentials */
330 if (s->pipe->conn->flags & DCERPC_SCHANNEL_128) {
331 s->local_negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
333 if (s->pipe->conn->flags & DCERPC_SCHANNEL_AES) {
334 s->local_negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
335 s->local_negotiate_flags |= NETLOGON_NEG_SUPPORTS_AES;
337 if (s->pipe->conn->flags & DCERPC_SCHANNEL_AUTO) {
338 s->local_negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
339 s->local_negotiate_flags |= NETLOGON_NEG_SUPPORTS_AES;
340 s->dcerpc_schannel_auto = true;
343 /* type of authentication depends on schannel type */
344 if (schannel_type == SEC_CHAN_RODC) {
345 s->local_negotiate_flags |= NETLOGON_NEG_RODC_PASSTHROUGH;
348 /* allocate binding structure */
349 s->binding = talloc_zero(c, struct dcerpc_binding);
350 if (composite_nomem(s->binding, c)) return c;
352 *s->binding = *s->pipe->binding;
354 /* request the netlogon endpoint mapping */
355 epm_map_req = dcerpc_epm_map_binding_send(c, s->binding,
357 s->pipe->conn->event_ctx,
359 if (composite_nomem(epm_map_req, c)) return c;
361 composite_continue(c, epm_map_req, continue_epm_map_binding, c);
367 Receive result of schannel key request
369 static NTSTATUS dcerpc_schannel_key_recv(struct composite_context *c,
371 struct netlogon_creds_CredentialState **creds)
373 NTSTATUS status = composite_wait(c);
375 if (NT_STATUS_IS_OK(status)) {
376 struct schannel_key_state *s =
377 talloc_get_type_abort(c->private_data,
378 struct schannel_key_state);
379 *creds = talloc_move(mem_ctx, &s->creds);
387 struct auth_schannel_state {
388 struct dcerpc_pipe *pipe;
389 struct cli_credentials *credentials;
390 const struct ndr_interface_table *table;
391 struct loadparm_context *lp_ctx;
393 struct netlogon_creds_CredentialState *creds_state;
394 struct netlogon_creds_CredentialState save_creds_state;
395 struct netr_Authenticator auth;
396 struct netr_Authenticator return_auth;
397 union netr_Capabilities capabilities;
398 struct netr_LogonGetCapabilities c;
402 static void continue_bind_auth(struct composite_context *ctx);
406 Stage 2 of auth_schannel: Receive schannel key and intitiate an
407 authenticated bind using received credentials
409 static void continue_schannel_key(struct composite_context *ctx)
411 struct composite_context *auth_req;
412 struct composite_context *c = talloc_get_type(ctx->async.private_data,
413 struct composite_context);
414 struct auth_schannel_state *s = talloc_get_type(c->private_data,
415 struct auth_schannel_state);
418 /* receive schannel key */
419 status = c->status = dcerpc_schannel_key_recv(ctx, s, &s->creds_state);
420 if (!composite_is_ok(c)) {
421 DEBUG(1, ("Failed to setup credentials: %s\n", nt_errstr(status)));
425 /* send bind auth request with received creds */
426 cli_credentials_set_netlogon_creds(s->credentials, s->creds_state);
428 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table, s->credentials,
429 lpcfg_gensec_settings(c, s->lp_ctx),
430 DCERPC_AUTH_TYPE_SCHANNEL, s->auth_level,
432 if (composite_nomem(auth_req, c)) return;
434 composite_continue(c, auth_req, continue_bind_auth, c);
439 Stage 3 of auth_schannel: Receivce result of authenticated bind
440 and say if we're done ok.
442 static void continue_bind_auth(struct composite_context *ctx)
444 struct composite_context *c = talloc_get_type(ctx->async.private_data,
445 struct composite_context);
446 struct auth_schannel_state *s = talloc_get_type(c->private_data,
447 struct auth_schannel_state);
448 struct tevent_req *subreq;
450 c->status = dcerpc_bind_auth_recv(ctx);
451 if (!composite_is_ok(c)) return;
453 /* if we have a AES encrypted connection, verify the capabilities */
454 if (ndr_syntax_id_equal(&s->table->syntax_id,
455 &ndr_table_netlogon.syntax_id)) {
456 ZERO_STRUCT(s->return_auth);
458 s->save_creds_state = *s->creds_state;
459 netlogon_creds_client_authenticator(&s->save_creds_state, &s->auth);
461 s->c.in.server_name = talloc_asprintf(c,
463 dcerpc_server_name(s->pipe));
464 if (composite_nomem(s->c.in.server_name, c)) return;
465 s->c.in.computer_name = cli_credentials_get_workstation(s->credentials);
466 s->c.in.credential = &s->auth;
467 s->c.in.return_authenticator = &s->return_auth;
468 s->c.in.query_level = 1;
470 s->c.out.capabilities = &s->capabilities;
471 s->c.out.return_authenticator = &s->return_auth;
473 DEBUG(5, ("We established a AES connection, verifying logon "
476 subreq = dcerpc_netr_LogonGetCapabilities_r_send(s,
478 s->pipe->binding_handle,
480 if (composite_nomem(subreq, c)) return;
482 tevent_req_set_callback(subreq, continue_get_capabilities, c);
490 Stage 4 of auth_schannel: Get the Logon Capablities and verify them.
492 static void continue_get_capabilities(struct tevent_req *subreq)
494 struct composite_context *c;
495 struct auth_schannel_state *s;
497 c = tevent_req_callback_data(subreq, struct composite_context);
498 s = talloc_get_type(c->private_data, struct auth_schannel_state);
500 /* receive rpc request result */
501 c->status = dcerpc_netr_LogonGetCapabilities_r_recv(subreq, s);
503 if (NT_STATUS_EQUAL(c->status, NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE)) {
504 if (s->creds_state->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
505 composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
508 /* This is probably NT */
512 } else if (!composite_is_ok(c)) {
516 if (NT_STATUS_EQUAL(s->c.out.result, NT_STATUS_NOT_IMPLEMENTED)) {
517 if (s->creds_state->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
518 /* This means AES isn't supported. */
519 composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
523 /* This is probably an old Samba version */
528 /* verify credentials */
529 if (!netlogon_creds_client_check(&s->save_creds_state,
530 &s->c.out.return_authenticator->cred)) {
531 composite_error(c, NT_STATUS_UNSUCCESSFUL);
535 *s->creds_state = s->save_creds_state;
536 cli_credentials_set_netlogon_creds(s->credentials, s->creds_state);
538 if (!NT_STATUS_IS_OK(s->c.out.result)) {
539 composite_error(c, s->c.out.result);
543 /* compare capabilities */
544 if (s->creds_state->negotiate_flags != s->capabilities.server_capabilities) {
545 DEBUG(2, ("The client capabilities don't match the server "
546 "capabilities: local[0x%08X] remote[0x%08X]\n",
547 s->creds_state->negotiate_flags,
548 s->capabilities.server_capabilities));
549 composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
553 /* TODO: Add downgrade dectection. */
560 Initiate schannel authentication request
562 struct composite_context *dcerpc_bind_auth_schannel_send(TALLOC_CTX *tmp_ctx,
563 struct dcerpc_pipe *p,
564 const struct ndr_interface_table *table,
565 struct cli_credentials *credentials,
566 struct loadparm_context *lp_ctx,
569 struct composite_context *c;
570 struct auth_schannel_state *s;
571 struct composite_context *schan_key_req;
573 /* composite context allocation and setup */
574 c = composite_create(tmp_ctx, p->conn->event_ctx);
575 if (c == NULL) return NULL;
577 s = talloc_zero(c, struct auth_schannel_state);
578 if (composite_nomem(s, c)) return c;
581 /* store parameters in the state structure */
583 s->credentials = credentials;
585 s->auth_level = auth_level;
588 /* start getting schannel key first */
589 schan_key_req = dcerpc_schannel_key_send(c, p, credentials, lp_ctx);
590 if (composite_nomem(schan_key_req, c)) return c;
592 composite_continue(c, schan_key_req, continue_schannel_key, c);
598 Receive result of schannel authentication request
600 NTSTATUS dcerpc_bind_auth_schannel_recv(struct composite_context *c)
602 NTSTATUS status = composite_wait(c);
610 Perform schannel authenticated bind - sync version
612 _PUBLIC_ NTSTATUS dcerpc_bind_auth_schannel(TALLOC_CTX *tmp_ctx,
613 struct dcerpc_pipe *p,
614 const struct ndr_interface_table *table,
615 struct cli_credentials *credentials,
616 struct loadparm_context *lp_ctx,
619 struct composite_context *c;
621 c = dcerpc_bind_auth_schannel_send(tmp_ctx, p, table, credentials, lp_ctx,
623 return dcerpc_bind_auth_schannel_recv(c);