2 Unix SMB/CIFS implementation.
4 server side dcerpc authentication code
6 Copyright (C) Andrew Tridgell 2003
7 Copyright (C) Stefan (metze) Metzmacher 2004
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.
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.
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/>.
24 #include "rpc_server/dcerpc_server.h"
25 #include "librpc/gen_ndr/ndr_dcerpc.h"
26 #include "auth/credentials/credentials.h"
27 #include "auth/gensec/gensec.h"
30 parse any auth information from a dcerpc bind request
31 return False if we can't handle the auth request for some
32 reason (in which case we send a bind_nak)
34 BOOL dcesrv_auth_bind(struct dcesrv_call_state *call)
36 struct cli_credentials *server_credentials;
37 struct ncacn_packet *pkt = &call->pkt;
38 struct dcesrv_connection *dce_conn = call->conn;
39 struct dcesrv_auth *auth = &dce_conn->auth_state;
42 if (pkt->u.bind.auth_info.length == 0) {
43 dce_conn->auth_state.auth_info = NULL;
47 dce_conn->auth_state.auth_info = talloc(dce_conn, struct dcerpc_auth);
48 if (!dce_conn->auth_state.auth_info) {
52 status = ndr_pull_struct_blob(&pkt->u.bind.auth_info,
54 dce_conn->auth_state.auth_info,
55 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
56 if (!NT_STATUS_IS_OK(status)) {
60 status = gensec_server_start(dce_conn, call->event_ctx, call->msg_ctx, &auth->gensec_security);
61 if (!NT_STATUS_IS_OK(status)) {
62 DEBUG(1, ("Failed to start GENSEC for DCERPC server: %s\n", nt_errstr(status)));
67 = cli_credentials_init(call);
68 if (!server_credentials) {
69 DEBUG(1, ("Failed to init server credentials\n"));
73 cli_credentials_set_conf(server_credentials);
74 status = cli_credentials_set_machine_account(server_credentials);
75 if (!NT_STATUS_IS_OK(status)) {
76 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
77 talloc_free(server_credentials);
78 server_credentials = NULL;
81 gensec_set_credentials(auth->gensec_security, server_credentials);
83 status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_info->auth_type,
84 auth->auth_info->auth_level);
86 if (!NT_STATUS_IS_OK(status)) {
87 DEBUG(1, ("Failed to start GENSEC mechanism for DCERPC server: auth_type=%d, auth_level=%d: %s\n",
88 (int)auth->auth_info->auth_type,
89 (int)auth->auth_info->auth_level,
98 add any auth information needed in a bind ack, and process the authentication
99 information found in the bind.
101 NTSTATUS dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
103 struct dcesrv_connection *dce_conn = call->conn;
106 if (!call->conn->auth_state.gensec_security) {
110 status = gensec_update(dce_conn->auth_state.gensec_security,
112 dce_conn->auth_state.auth_info->credentials,
113 &dce_conn->auth_state.auth_info->credentials);
115 if (NT_STATUS_IS_OK(status)) {
116 status = gensec_session_info(dce_conn->auth_state.gensec_security,
117 &dce_conn->auth_state.session_info);
118 if (!NT_STATUS_IS_OK(status)) {
119 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
123 /* Now that we are authenticated, go back to the generic session key... */
124 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
126 } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
127 dce_conn->auth_state.auth_info->auth_pad_length = 0;
128 dce_conn->auth_state.auth_info->auth_reserved = 0;
131 DEBUG(2, ("Failed to start dcesrv auth negotiate: %s\n", nt_errstr(status)));
138 process the final stage of a auth request
140 BOOL dcesrv_auth_auth3(struct dcesrv_call_state *call)
142 struct ncacn_packet *pkt = &call->pkt;
143 struct dcesrv_connection *dce_conn = call->conn;
146 /* We can't work without an existing gensec state, and an new blob to feed it */
147 if (!dce_conn->auth_state.auth_info ||
148 !dce_conn->auth_state.gensec_security ||
149 pkt->u.auth3.auth_info.length == 0) {
153 status = ndr_pull_struct_blob(&pkt->u.auth3.auth_info,
155 dce_conn->auth_state.auth_info,
156 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
157 if (!NT_STATUS_IS_OK(status)) {
161 /* Pass the extra data we got from the client down to gensec for processing */
162 status = gensec_update(dce_conn->auth_state.gensec_security,
164 dce_conn->auth_state.auth_info->credentials,
165 &dce_conn->auth_state.auth_info->credentials);
166 if (NT_STATUS_IS_OK(status)) {
167 status = gensec_session_info(dce_conn->auth_state.gensec_security,
168 &dce_conn->auth_state.session_info);
169 if (!NT_STATUS_IS_OK(status)) {
170 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
173 /* Now that we are authenticated, go back to the generic session key... */
174 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
177 DEBUG(4, ("dcesrv_auth_auth3: failed to authenticate: %s\n",
186 parse any auth information from a dcerpc alter request
187 return False if we can't handle the auth request for some
188 reason (in which case we send a bind_nak (is this true for here?))
190 BOOL dcesrv_auth_alter(struct dcesrv_call_state *call)
192 struct ncacn_packet *pkt = &call->pkt;
193 struct dcesrv_connection *dce_conn = call->conn;
196 /* on a pure interface change there is no auth blob */
197 if (pkt->u.alter.auth_info.length == 0) {
201 /* We can't work without an existing gensec state */
202 if (!dce_conn->auth_state.gensec_security) {
206 dce_conn->auth_state.auth_info = talloc(dce_conn, struct dcerpc_auth);
207 if (!dce_conn->auth_state.auth_info) {
211 status = ndr_pull_struct_blob(&pkt->u.alter.auth_info,
213 dce_conn->auth_state.auth_info,
214 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
215 if (!NT_STATUS_IS_OK(status)) {
223 add any auth information needed in a alter ack, and process the authentication
224 information found in the alter.
226 NTSTATUS dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
228 struct dcesrv_connection *dce_conn = call->conn;
231 /* on a pure interface change there is no auth_info structure
233 if (!call->conn->auth_state.auth_info ||
234 dce_conn->auth_state.auth_info->credentials.length == 0) {
238 if (!call->conn->auth_state.gensec_security) {
239 return NT_STATUS_INVALID_PARAMETER;
242 status = gensec_update(dce_conn->auth_state.gensec_security,
244 dce_conn->auth_state.auth_info->credentials,
245 &dce_conn->auth_state.auth_info->credentials);
247 if (NT_STATUS_IS_OK(status)) {
248 status = gensec_session_info(dce_conn->auth_state.gensec_security,
249 &dce_conn->auth_state.session_info);
250 if (!NT_STATUS_IS_OK(status)) {
251 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
255 /* Now that we are authenticated, got back to the generic session key... */
256 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
258 } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
259 dce_conn->auth_state.auth_info->auth_pad_length = 0;
260 dce_conn->auth_state.auth_info->auth_reserved = 0;
264 DEBUG(2, ("Failed to finish dcesrv auth alter_ack: %s\n", nt_errstr(status)));
269 generate a CONNECT level verifier
271 static NTSTATUS dcesrv_connect_verifier(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
273 *blob = data_blob_talloc(mem_ctx, NULL, 16);
274 if (blob->data == NULL) {
275 return NT_STATUS_NO_MEMORY;
277 SIVAL(blob->data, 0, 1);
278 memset(blob->data+4, 0, 12);
283 generate a CONNECT level verifier
285 static NTSTATUS dcesrv_check_connect_verifier(DATA_BLOB *blob)
287 if (blob->length != 16 ||
288 IVAL(blob->data, 0) != 1) {
289 return NT_STATUS_ACCESS_DENIED;
296 check credentials on a request
298 BOOL dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
300 struct ncacn_packet *pkt = &call->pkt;
301 struct dcesrv_connection *dce_conn = call->conn;
303 struct dcerpc_auth auth;
304 struct ndr_pull *ndr;
307 if (!dce_conn->auth_state.auth_info ||
308 !dce_conn->auth_state.gensec_security) {
312 auth_blob.length = 8 + pkt->auth_length;
314 /* check for a valid length */
315 if (pkt->u.request.stub_and_verifier.length < auth_blob.length) {
320 pkt->u.request.stub_and_verifier.data +
321 pkt->u.request.stub_and_verifier.length - auth_blob.length;
322 pkt->u.request.stub_and_verifier.length -= auth_blob.length;
324 /* pull the auth structure */
325 ndr = ndr_pull_init_blob(&auth_blob, call);
330 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
331 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
334 status = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
335 if (!NT_STATUS_IS_OK(status)) {
340 /* check signature or unseal the packet */
341 switch (dce_conn->auth_state.auth_info->auth_level) {
342 case DCERPC_AUTH_LEVEL_PRIVACY:
343 status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
345 full_packet->data + DCERPC_REQUEST_LENGTH,
346 pkt->u.request.stub_and_verifier.length,
348 full_packet->length-auth.credentials.length,
350 memcpy(pkt->u.request.stub_and_verifier.data,
351 full_packet->data + DCERPC_REQUEST_LENGTH,
352 pkt->u.request.stub_and_verifier.length);
355 case DCERPC_AUTH_LEVEL_INTEGRITY:
356 status = gensec_check_packet(dce_conn->auth_state.gensec_security,
358 pkt->u.request.stub_and_verifier.data,
359 pkt->u.request.stub_and_verifier.length,
361 full_packet->length-auth.credentials.length,
365 case DCERPC_AUTH_LEVEL_CONNECT:
366 status = dcesrv_check_connect_verifier(&auth.credentials);
370 status = NT_STATUS_INVALID_LEVEL;
374 /* remove the indicated amount of padding */
375 if (pkt->u.request.stub_and_verifier.length < auth.auth_pad_length) {
379 pkt->u.request.stub_and_verifier.length -= auth.auth_pad_length;
382 return NT_STATUS_IS_OK(status);
387 push a signed or sealed dcerpc request packet into a blob
389 BOOL dcesrv_auth_response(struct dcesrv_call_state *call,
390 DATA_BLOB *blob, struct ncacn_packet *pkt)
392 struct dcesrv_connection *dce_conn = call->conn;
394 struct ndr_push *ndr;
395 uint32_t payload_length;
398 /* non-signed packets are simple */
399 if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.gensec_security) {
400 status = ncacn_push_auth(blob, call, pkt, NULL);
401 return NT_STATUS_IS_OK(status);
404 ndr = ndr_push_init_ctx(call);
409 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
410 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
413 status = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
414 if (!NT_STATUS_IS_OK(status)) {
418 /* pad to 16 byte multiple, match win2k3 */
419 dce_conn->auth_state.auth_info->auth_pad_length = NDR_ALIGN(ndr, 16);
420 ndr_push_zero(ndr, dce_conn->auth_state.auth_info->auth_pad_length);
422 payload_length = ndr->offset - DCERPC_REQUEST_LENGTH;
424 if (dce_conn->auth_state.auth_info->auth_level == DCERPC_AUTH_LEVEL_CONNECT) {
425 status = dcesrv_connect_verifier(call,
426 &dce_conn->auth_state.auth_info->credentials);
427 if (!NT_STATUS_IS_OK(status)) {
432 /* We hope this length is accruate. If must be if the
433 * GENSEC mech does AEAD signing of the packet
435 dce_conn->auth_state.auth_info->credentials
436 = data_blob_talloc(call, NULL,
437 gensec_sig_size(dce_conn->auth_state.gensec_security,
439 data_blob_clear(&dce_conn->auth_state.auth_info->credentials);
442 /* add the auth verifier */
443 status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
444 dce_conn->auth_state.auth_info);
445 if (!NT_STATUS_IS_OK(status)) {
449 /* extract the whole packet as a blob */
450 *blob = ndr_push_blob(ndr);
452 /* fill in the fragment length and auth_length, we can't fill
453 in these earlier as we don't know the signature length (it
454 could be variable length) */
455 dcerpc_set_frag_length(blob, blob->length);
457 /* We hope this value is accruate. If must be if the GENSEC
458 * mech does AEAD signing of the packet headers */
459 dcerpc_set_auth_length(blob, dce_conn->auth_state.auth_info->credentials.length);
461 /* sign or seal the packet */
462 switch (dce_conn->auth_state.auth_info->auth_level) {
463 case DCERPC_AUTH_LEVEL_PRIVACY:
464 status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
466 ndr->data + DCERPC_REQUEST_LENGTH,
469 blob->length - dce_conn->auth_state.auth_info->credentials.length,
472 if (NT_STATUS_IS_OK(status)) {
473 blob->length -= dce_conn->auth_state.auth_info->credentials.length;
474 status = data_blob_append(call, blob, creds2.data, creds2.length);
477 /* If we did AEAD signing of the packet headers, then we hope
478 * this value didn't change... */
479 dcerpc_set_auth_length(blob, creds2.length);
480 dcerpc_set_frag_length(blob, dcerpc_get_frag_length(blob)+creds2.length);
481 data_blob_free(&creds2);
484 case DCERPC_AUTH_LEVEL_INTEGRITY:
485 status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
487 ndr->data + DCERPC_REQUEST_LENGTH,
490 blob->length - dce_conn->auth_state.auth_info->credentials.length,
492 if (NT_STATUS_IS_OK(status)) {
493 blob->length -= dce_conn->auth_state.auth_info->credentials.length;
494 status = data_blob_append(call, blob, creds2.data, creds2.length);
497 /* If we did AEAD signing of the packet headers, then we hope
498 * this value didn't change... */
499 dcerpc_set_auth_length(blob, creds2.length);
500 dcerpc_set_frag_length(blob, dcerpc_get_frag_length(blob)+creds2.length);
501 data_blob_free(&creds2);
504 case DCERPC_AUTH_LEVEL_CONNECT:
508 status = NT_STATUS_INVALID_LEVEL;
512 data_blob_free(&dce_conn->auth_state.auth_info->credentials);
514 if (!NT_STATUS_IS_OK(status)) {