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 "rpc_server/dcerpc_server_proto.h"
26 #include "rpc_server/common/proto.h"
27 #include "librpc/rpc/dcerpc_proto.h"
28 #include "librpc/gen_ndr/ndr_dcerpc.h"
29 #include "auth/credentials/credentials.h"
30 #include "auth/gensec/gensec.h"
31 #include "auth/auth.h"
32 #include "param/param.h"
33 #include "librpc/rpc/rpc_common.h"
36 parse any auth information from a dcerpc bind request
37 return false if we can't handle the auth request for some
38 reason (in which case we send a bind_nak)
40 bool dcesrv_auth_bind(struct dcesrv_call_state *call)
42 struct cli_credentials *server_credentials = NULL;
43 struct ncacn_packet *pkt = &call->pkt;
44 struct dcesrv_connection *dce_conn = call->conn;
45 struct dcesrv_auth *auth = &dce_conn->auth_state;
48 if (pkt->auth_length == 0) {
49 auth->auth_type = DCERPC_AUTH_TYPE_NONE;
50 auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
51 auth->auth_context_id = 0;
55 status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.bind.auth_info,
58 if (!NT_STATUS_IS_OK(status)) {
60 * Setting DCERPC_AUTH_LEVEL_NONE,
61 * gives the caller the reject_reason
64 * Note: DCERPC_AUTH_LEVEL_NONE == 1
66 auth->auth_type = DCERPC_AUTH_TYPE_NONE;
67 auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
68 auth->auth_context_id =
69 DCERPC_BIND_NAK_REASON_PROTOCOL_VERSION_NOT_SUPPORTED;
73 switch (call->in_auth_info.auth_level) {
74 case DCERPC_AUTH_LEVEL_CONNECT:
75 case DCERPC_AUTH_LEVEL_CALL:
76 case DCERPC_AUTH_LEVEL_PACKET:
77 case DCERPC_AUTH_LEVEL_INTEGRITY:
78 case DCERPC_AUTH_LEVEL_PRIVACY:
80 * We evaluate auth_type only if auth_level was valid
85 * Setting DCERPC_AUTH_LEVEL_NONE,
86 * gives the caller the reject_reason
89 * Note: DCERPC_AUTH_LEVEL_NONE == 1
91 auth->auth_type = DCERPC_AUTH_TYPE_NONE;
92 auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
93 auth->auth_context_id = DCERPC_BIND_NAK_REASON_NOT_SPECIFIED;
97 auth->auth_type = call->in_auth_info.auth_type;
98 auth->auth_level = call->in_auth_info.auth_level;
99 auth->auth_context_id = call->in_auth_info.auth_context_id;
102 = cli_credentials_init(call);
103 if (!server_credentials) {
104 DEBUG(1, ("Failed to init server credentials\n"));
108 cli_credentials_set_conf(server_credentials, call->conn->dce_ctx->lp_ctx);
109 status = cli_credentials_set_machine_account(server_credentials, call->conn->dce_ctx->lp_ctx);
110 if (!NT_STATUS_IS_OK(status)) {
111 DEBUG(1, ("Failed to obtain server credentials: %s\n",
116 status = samba_server_gensec_start(dce_conn, call->event_ctx,
118 call->conn->dce_ctx->lp_ctx,
121 &auth->gensec_security);
122 if (!NT_STATUS_IS_OK(status)) {
123 DEBUG(1, ("Failed to call samba_server_gensec_start %s\n",
128 if (call->conn->remote_address != NULL) {
129 status = gensec_set_remote_address(auth->gensec_security,
130 call->conn->remote_address);
131 if (!NT_STATUS_IS_OK(status)) {
132 DEBUG(1, ("Failed to call gensec_set_remote_address() %s\n",
138 status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_type,
140 if (!NT_STATUS_IS_OK(status)) {
141 const char *backend_name =
142 gensec_get_name_by_authtype(auth->gensec_security,
145 DEBUG(3, ("Failed to start GENSEC mechanism for DCERPC server: "
146 "auth_type=%d (%s), auth_level=%d: %s\n",
147 (int)auth->auth_type, backend_name,
148 (int)auth->auth_level,
152 * Setting DCERPC_AUTH_LEVEL_NONE,
153 * gives the caller the reject_reason
154 * as auth_context_id.
156 * Note: DCERPC_AUTH_LEVEL_NONE == 1
158 auth->auth_type = DCERPC_AUTH_TYPE_NONE;
159 auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
160 if (backend_name != NULL) {
161 auth->auth_context_id =
162 DCERPC_BIND_NAK_REASON_INVALID_CHECKSUM;
164 auth->auth_context_id =
165 DCERPC_BIND_NAK_REASON_INVALID_AUTH_TYPE;
174 add any auth information needed in a bind ack, and process the authentication
175 information found in the bind.
177 NTSTATUS dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
179 struct dcesrv_connection *dce_conn = call->conn;
181 bool want_header_signing = false;
183 dce_conn->allow_alter = true;
184 dce_conn->allow_auth3 = true;
186 if (call->pkt.auth_length == 0) {
187 dce_conn->auth_state.auth_finished = true;
188 dce_conn->allow_request = true;
192 /* We can't work without an existing gensec state */
193 if (!call->conn->auth_state.gensec_security) {
194 return NT_STATUS_INTERNAL_ERROR;
197 if (call->pkt.pfc_flags & DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN) {
198 dce_conn->auth_state.client_hdr_signing = true;
199 want_header_signing = true;
202 if (!lpcfg_parm_bool(call->conn->dce_ctx->lp_ctx, NULL, "dcesrv","header signing", true)) {
203 want_header_signing = false;
206 call->_out_auth_info = (struct dcerpc_auth) {
207 .auth_type = dce_conn->auth_state.auth_type,
208 .auth_level = dce_conn->auth_state.auth_level,
209 .auth_context_id = dce_conn->auth_state.auth_context_id,
211 call->out_auth_info = &call->_out_auth_info;
213 status = gensec_update_ev(dce_conn->auth_state.gensec_security,
214 call, call->event_ctx,
215 call->in_auth_info.credentials,
216 &call->out_auth_info->credentials);
218 if (NT_STATUS_IS_OK(status)) {
219 status = gensec_session_info(dce_conn->auth_state.gensec_security,
221 &dce_conn->auth_state.session_info);
222 if (!NT_STATUS_IS_OK(status)) {
223 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
226 dce_conn->auth_state.auth_finished = true;
227 dce_conn->allow_request = true;
229 if (!gensec_have_feature(dce_conn->auth_state.gensec_security,
230 GENSEC_FEATURE_SIGN_PKT_HEADER))
232 want_header_signing = false;
235 if (want_header_signing) {
236 gensec_want_feature(dce_conn->auth_state.gensec_security,
237 GENSEC_FEATURE_SIGN_PKT_HEADER);
238 dce_conn->auth_state.hdr_signing = true;
239 pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
242 /* Now that we are authenticated, go back to the generic session key... */
243 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
245 } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
246 if (!gensec_have_feature(dce_conn->auth_state.gensec_security,
247 GENSEC_FEATURE_SIGN_PKT_HEADER))
249 want_header_signing = false;
252 if (want_header_signing) {
253 gensec_want_feature(dce_conn->auth_state.gensec_security,
254 GENSEC_FEATURE_SIGN_PKT_HEADER);
255 dce_conn->auth_state.hdr_signing = true;
256 pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
261 DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_ack: %s\n",
269 process the final stage of a auth request
271 bool dcesrv_auth_auth3(struct dcesrv_call_state *call)
273 struct ncacn_packet *pkt = &call->pkt;
274 struct dcesrv_connection *dce_conn = call->conn;
277 if (pkt->auth_length == 0) {
281 if (dce_conn->auth_state.auth_finished) {
285 /* We can't work without an existing gensec state */
286 if (!dce_conn->auth_state.gensec_security) {
290 status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.auth3.auth_info,
291 &call->in_auth_info, NULL, true);
292 if (!NT_STATUS_IS_OK(status)) {
294 * Windows returns DCERPC_NCA_S_FAULT_REMOTE_NO_MEMORY
295 * instead of DCERPC_NCA_S_PROTO_ERROR.
297 call->fault_code = DCERPC_NCA_S_FAULT_REMOTE_NO_MEMORY;
301 if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
305 if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
309 if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
313 call->_out_auth_info = (struct dcerpc_auth) {
314 .auth_type = dce_conn->auth_state.auth_type,
315 .auth_level = dce_conn->auth_state.auth_level,
316 .auth_context_id = dce_conn->auth_state.auth_context_id,
318 call->out_auth_info = &call->_out_auth_info;
320 /* Pass the extra data we got from the client down to gensec for processing */
321 status = gensec_update_ev(dce_conn->auth_state.gensec_security,
322 call, call->event_ctx,
323 call->in_auth_info.credentials,
324 &call->out_auth_info->credentials);
325 if (NT_STATUS_IS_OK(status)) {
326 status = gensec_session_info(dce_conn->auth_state.gensec_security,
328 &dce_conn->auth_state.session_info);
329 if (!NT_STATUS_IS_OK(status)) {
330 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
333 dce_conn->auth_state.auth_finished = true;
334 dce_conn->allow_request = true;
336 /* Now that we are authenticated, go back to the generic session key... */
337 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
339 if (call->out_auth_info->credentials.length != 0) {
341 DEBUG(4, ("GENSEC produced output token (len=%u) at bind_auth3\n",
342 (unsigned)call->out_auth_info->credentials.length));
347 DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_auth3: %s\n",
354 parse any auth information from a dcerpc alter request
355 return false if we can't handle the auth request for some
356 reason (in which case we send a bind_nak (is this true for here?))
358 bool dcesrv_auth_alter(struct dcesrv_call_state *call)
360 struct ncacn_packet *pkt = &call->pkt;
361 struct dcesrv_connection *dce_conn = call->conn;
364 /* on a pure interface change there is no auth blob */
365 if (pkt->auth_length == 0) {
366 if (!dce_conn->auth_state.auth_finished) {
372 if (dce_conn->auth_state.auth_finished) {
373 call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
377 /* We can't work without an existing gensec state */
378 if (!dce_conn->auth_state.gensec_security) {
382 status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.alter.auth_info,
383 &call->in_auth_info, NULL, true);
384 if (!NT_STATUS_IS_OK(status)) {
385 call->fault_code = DCERPC_NCA_S_PROTO_ERROR;
389 if (call->in_auth_info.auth_type == DCERPC_AUTH_TYPE_NONE) {
390 call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
394 if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
398 if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
402 if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
410 add any auth information needed in a alter ack, and process the authentication
411 information found in the alter.
413 NTSTATUS dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
415 struct dcesrv_connection *dce_conn = call->conn;
418 /* on a pure interface change there is no auth_info structure
420 if (call->pkt.auth_length == 0) {
424 if (!call->conn->auth_state.gensec_security) {
425 return NT_STATUS_INTERNAL_ERROR;
428 call->_out_auth_info = (struct dcerpc_auth) {
429 .auth_type = dce_conn->auth_state.auth_type,
430 .auth_level = dce_conn->auth_state.auth_level,
431 .auth_context_id = dce_conn->auth_state.auth_context_id,
433 call->out_auth_info = &call->_out_auth_info;
435 status = gensec_update_ev(dce_conn->auth_state.gensec_security,
436 call, call->event_ctx,
437 call->in_auth_info.credentials,
438 &call->out_auth_info->credentials);
440 if (NT_STATUS_IS_OK(status)) {
441 status = gensec_session_info(dce_conn->auth_state.gensec_security,
443 &dce_conn->auth_state.session_info);
444 if (!NT_STATUS_IS_OK(status)) {
445 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
448 dce_conn->auth_state.auth_finished = true;
449 dce_conn->allow_request = true;
451 /* Now that we are authenticated, got back to the generic session key... */
452 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
454 } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
458 DEBUG(4, ("GENSEC mech rejected the incoming authentication at auth alter_ack: %s\n",
464 check credentials on a request
466 bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
468 struct ncacn_packet *pkt = &call->pkt;
469 struct dcesrv_connection *dce_conn = call->conn;
471 uint32_t auth_length;
472 size_t hdr_size = DCERPC_REQUEST_LENGTH;
474 if (!dce_conn->allow_request) {
478 if (dce_conn->auth_state.auth_invalid) {
482 if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
486 switch (dce_conn->auth_state.auth_level) {
487 case DCERPC_AUTH_LEVEL_PRIVACY:
488 case DCERPC_AUTH_LEVEL_INTEGRITY:
491 case DCERPC_AUTH_LEVEL_CONNECT:
492 if (pkt->auth_length != 0) {
496 case DCERPC_AUTH_LEVEL_NONE:
497 if (pkt->auth_length != 0) {
506 if (!dce_conn->auth_state.gensec_security) {
510 status = dcerpc_pull_auth_trailer(pkt, call,
511 &pkt->u.request.stub_and_verifier,
512 &call->in_auth_info, &auth_length, false);
513 if (!NT_STATUS_IS_OK(status)) {
517 if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
521 if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
525 if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
529 pkt->u.request.stub_and_verifier.length -= auth_length;
531 /* check signature or unseal the packet */
532 switch (dce_conn->auth_state.auth_level) {
533 case DCERPC_AUTH_LEVEL_PRIVACY:
534 status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
535 full_packet->data + hdr_size,
536 pkt->u.request.stub_and_verifier.length,
539 call->in_auth_info.credentials.length,
540 &call->in_auth_info.credentials);
541 memcpy(pkt->u.request.stub_and_verifier.data,
542 full_packet->data + hdr_size,
543 pkt->u.request.stub_and_verifier.length);
546 case DCERPC_AUTH_LEVEL_INTEGRITY:
547 status = gensec_check_packet(dce_conn->auth_state.gensec_security,
548 pkt->u.request.stub_and_verifier.data,
549 pkt->u.request.stub_and_verifier.length,
552 call->in_auth_info.credentials.length,
553 &call->in_auth_info.credentials);
556 case DCERPC_AUTH_LEVEL_CONNECT:
557 /* for now we ignore possible signatures here */
558 status = NT_STATUS_OK;
562 status = NT_STATUS_INVALID_LEVEL;
566 /* remove the indicated amount of padding */
567 if (pkt->u.request.stub_and_verifier.length < call->in_auth_info.auth_pad_length) {
570 pkt->u.request.stub_and_verifier.length -= call->in_auth_info.auth_pad_length;
572 return NT_STATUS_IS_OK(status);
577 push a signed or sealed dcerpc request packet into a blob
579 bool dcesrv_auth_response(struct dcesrv_call_state *call,
580 DATA_BLOB *blob, size_t sig_size,
581 struct ncacn_packet *pkt)
583 struct dcesrv_connection *dce_conn = call->conn;
585 enum ndr_err_code ndr_err;
586 struct ndr_push *ndr;
587 uint32_t payload_length;
590 switch (dce_conn->auth_state.auth_level) {
591 case DCERPC_AUTH_LEVEL_PRIVACY:
592 case DCERPC_AUTH_LEVEL_INTEGRITY:
599 case DCERPC_AUTH_LEVEL_CONNECT:
601 * TODO: let the gensec mech decide if it wants to generate a
602 * signature that might be needed for schannel...
604 status = ncacn_push_auth(blob, call, pkt, NULL);
605 return NT_STATUS_IS_OK(status);
607 case DCERPC_AUTH_LEVEL_NONE:
608 status = ncacn_push_auth(blob, call, pkt, NULL);
609 return NT_STATUS_IS_OK(status);
615 if (!dce_conn->auth_state.gensec_security) {
619 ndr = ndr_push_init_ctx(call);
624 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
625 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
628 ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
629 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
633 call->_out_auth_info = (struct dcerpc_auth) {
634 .auth_type = dce_conn->auth_state.auth_type,
635 .auth_level = dce_conn->auth_state.auth_level,
636 .auth_context_id = dce_conn->auth_state.auth_context_id,
638 call->out_auth_info = &call->_out_auth_info;
640 /* pad to 16 byte multiple in the payload portion of the
641 packet. This matches what w2k3 does. Note that we can't use
642 ndr_push_align() as that is relative to the start of the
643 whole packet, whereas w2k8 wants it relative to the start
645 call->out_auth_info->auth_pad_length =
646 DCERPC_AUTH_PAD_LENGTH(pkt->u.response.stub_and_verifier.length);
647 ndr_err = ndr_push_zero(ndr, call->out_auth_info->auth_pad_length);
648 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
652 payload_length = pkt->u.response.stub_and_verifier.length +
653 call->out_auth_info->auth_pad_length;
655 /* add the auth verifier */
656 ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
657 call->out_auth_info);
658 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
662 /* extract the whole packet as a blob */
663 *blob = ndr_push_blob(ndr);
666 * Setup the frag and auth length in the packet buffer.
667 * This is needed if the GENSEC mech does AEAD signing
668 * of the packet headers. The signature itself will be
671 dcerpc_set_frag_length(blob, blob->length + sig_size);
672 dcerpc_set_auth_length(blob, sig_size);
674 /* sign or seal the packet */
675 switch (dce_conn->auth_state.auth_level) {
676 case DCERPC_AUTH_LEVEL_PRIVACY:
677 status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
679 ndr->data + DCERPC_REQUEST_LENGTH,
686 case DCERPC_AUTH_LEVEL_INTEGRITY:
687 status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
689 ndr->data + DCERPC_REQUEST_LENGTH,
697 status = NT_STATUS_INVALID_LEVEL;
701 if (!NT_STATUS_IS_OK(status)) {
705 if (creds2.length != sig_size) {
706 DEBUG(3,("dcesrv_auth_response: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
707 (unsigned)creds2.length, (uint32_t)sig_size,
708 (unsigned)call->out_auth_info->auth_pad_length,
709 (unsigned)pkt->u.response.stub_and_verifier.length));
710 dcerpc_set_frag_length(blob, blob->length + creds2.length);
711 dcerpc_set_auth_length(blob, creds2.length);
714 if (!data_blob_append(call, blob, creds2.data, creds2.length)) {
715 status = NT_STATUS_NO_MEMORY;
718 data_blob_free(&creds2);