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"
28 #include "param/param.h"
31 parse any auth information from a dcerpc bind request
32 return false if we can't handle the auth request for some
33 reason (in which case we send a bind_nak)
35 bool dcesrv_auth_bind(struct dcesrv_call_state *call)
37 struct cli_credentials *server_credentials;
38 struct ncacn_packet *pkt = &call->pkt;
39 struct dcesrv_connection *dce_conn = call->conn;
40 struct dcesrv_auth *auth = &dce_conn->auth_state;
42 enum ndr_err_code ndr_err;
44 if (pkt->u.bind.auth_info.length == 0) {
45 dce_conn->auth_state.auth_info = NULL;
49 dce_conn->auth_state.auth_info = talloc(dce_conn, struct dcerpc_auth);
50 if (!dce_conn->auth_state.auth_info) {
54 ndr_err = ndr_pull_struct_blob(&pkt->u.bind.auth_info,
56 dce_conn->auth_state.auth_info,
57 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
58 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
62 status = gensec_server_start(dce_conn, call->event_ctx, call->conn->dce_ctx->lp_ctx, call->msg_ctx, &auth->gensec_security);
63 if (!NT_STATUS_IS_OK(status)) {
64 DEBUG(1, ("Failed to start GENSEC for DCERPC server: %s\n", nt_errstr(status)));
69 = cli_credentials_init(call);
70 if (!server_credentials) {
71 DEBUG(1, ("Failed to init server credentials\n"));
75 cli_credentials_set_conf(server_credentials, call->conn->dce_ctx->lp_ctx);
76 status = cli_credentials_set_machine_account(server_credentials, call->conn->dce_ctx->lp_ctx);
77 if (!NT_STATUS_IS_OK(status)) {
78 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
79 talloc_free(server_credentials);
80 server_credentials = NULL;
83 gensec_set_credentials(auth->gensec_security, server_credentials);
85 status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_info->auth_type,
86 auth->auth_info->auth_level);
88 if (!NT_STATUS_IS_OK(status)) {
89 DEBUG(1, ("Failed to start GENSEC mechanism for DCERPC server: auth_type=%d, auth_level=%d: %s\n",
90 (int)auth->auth_info->auth_type,
91 (int)auth->auth_info->auth_level,
100 add any auth information needed in a bind ack, and process the authentication
101 information found in the bind.
103 NTSTATUS dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
105 struct dcesrv_connection *dce_conn = call->conn;
108 if (!call->conn->auth_state.gensec_security) {
112 status = gensec_update(dce_conn->auth_state.gensec_security,
114 dce_conn->auth_state.auth_info->credentials,
115 &dce_conn->auth_state.auth_info->credentials);
117 if (NT_STATUS_IS_OK(status)) {
118 status = gensec_session_info(dce_conn->auth_state.gensec_security,
119 &dce_conn->auth_state.session_info);
120 if (!NT_STATUS_IS_OK(status)) {
121 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
125 /* Now that we are authenticated, go back to the generic session key... */
126 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
128 } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
129 dce_conn->auth_state.auth_info->auth_pad_length = 0;
130 dce_conn->auth_state.auth_info->auth_reserved = 0;
133 DEBUG(2, ("Failed to start dcesrv auth negotiate: %s\n", nt_errstr(status)));
140 process the final stage of a auth request
142 bool dcesrv_auth_auth3(struct dcesrv_call_state *call)
144 struct ncacn_packet *pkt = &call->pkt;
145 struct dcesrv_connection *dce_conn = call->conn;
147 enum ndr_err_code ndr_err;
149 /* We can't work without an existing gensec state, and an new blob to feed it */
150 if (!dce_conn->auth_state.auth_info ||
151 !dce_conn->auth_state.gensec_security ||
152 pkt->u.auth3.auth_info.length == 0) {
156 ndr_err = ndr_pull_struct_blob(&pkt->u.auth3.auth_info,
158 dce_conn->auth_state.auth_info,
159 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
160 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
164 /* Pass the extra data we got from the client down to gensec for processing */
165 status = gensec_update(dce_conn->auth_state.gensec_security,
167 dce_conn->auth_state.auth_info->credentials,
168 &dce_conn->auth_state.auth_info->credentials);
169 if (NT_STATUS_IS_OK(status)) {
170 status = gensec_session_info(dce_conn->auth_state.gensec_security,
171 &dce_conn->auth_state.session_info);
172 if (!NT_STATUS_IS_OK(status)) {
173 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
176 /* Now that we are authenticated, go back to the generic session key... */
177 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
180 DEBUG(4, ("dcesrv_auth_auth3: failed to authenticate: %s\n",
189 parse any auth information from a dcerpc alter request
190 return false if we can't handle the auth request for some
191 reason (in which case we send a bind_nak (is this true for here?))
193 bool dcesrv_auth_alter(struct dcesrv_call_state *call)
195 struct ncacn_packet *pkt = &call->pkt;
196 struct dcesrv_connection *dce_conn = call->conn;
197 enum ndr_err_code ndr_err;
199 /* on a pure interface change there is no auth blob */
200 if (pkt->u.alter.auth_info.length == 0) {
204 /* We can't work without an existing gensec state */
205 if (!dce_conn->auth_state.gensec_security) {
209 dce_conn->auth_state.auth_info = talloc(dce_conn, struct dcerpc_auth);
210 if (!dce_conn->auth_state.auth_info) {
214 ndr_err = ndr_pull_struct_blob(&pkt->u.alter.auth_info,
216 dce_conn->auth_state.auth_info,
217 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
218 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
226 add any auth information needed in a alter ack, and process the authentication
227 information found in the alter.
229 NTSTATUS dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
231 struct dcesrv_connection *dce_conn = call->conn;
234 /* on a pure interface change there is no auth_info structure
236 if (!call->conn->auth_state.auth_info ||
237 dce_conn->auth_state.auth_info->credentials.length == 0) {
241 if (!call->conn->auth_state.gensec_security) {
242 return NT_STATUS_INVALID_PARAMETER;
245 status = gensec_update(dce_conn->auth_state.gensec_security,
247 dce_conn->auth_state.auth_info->credentials,
248 &dce_conn->auth_state.auth_info->credentials);
250 if (NT_STATUS_IS_OK(status)) {
251 status = gensec_session_info(dce_conn->auth_state.gensec_security,
252 &dce_conn->auth_state.session_info);
253 if (!NT_STATUS_IS_OK(status)) {
254 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
258 /* Now that we are authenticated, got back to the generic session key... */
259 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
261 } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
262 dce_conn->auth_state.auth_info->auth_pad_length = 0;
263 dce_conn->auth_state.auth_info->auth_reserved = 0;
267 DEBUG(2, ("Failed to finish dcesrv auth alter_ack: %s\n", nt_errstr(status)));
272 generate a CONNECT level verifier
274 static NTSTATUS dcesrv_connect_verifier(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
276 *blob = data_blob_talloc(mem_ctx, NULL, 16);
277 if (blob->data == NULL) {
278 return NT_STATUS_NO_MEMORY;
280 SIVAL(blob->data, 0, 1);
281 memset(blob->data+4, 0, 12);
286 generate a CONNECT level verifier
288 static NTSTATUS dcesrv_check_connect_verifier(DATA_BLOB *blob)
290 if (blob->length != 16 ||
291 IVAL(blob->data, 0) != 1) {
292 return NT_STATUS_ACCESS_DENIED;
299 check credentials on a request
301 bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
303 struct ncacn_packet *pkt = &call->pkt;
304 struct dcesrv_connection *dce_conn = call->conn;
306 struct dcerpc_auth auth;
307 struct ndr_pull *ndr;
309 enum ndr_err_code ndr_err;
311 if (!dce_conn->auth_state.auth_info ||
312 !dce_conn->auth_state.gensec_security) {
316 auth_blob.length = 8 + pkt->auth_length;
318 /* check for a valid length */
319 if (pkt->u.request.stub_and_verifier.length < auth_blob.length) {
324 pkt->u.request.stub_and_verifier.data +
325 pkt->u.request.stub_and_verifier.length - auth_blob.length;
326 pkt->u.request.stub_and_verifier.length -= auth_blob.length;
328 /* pull the auth structure */
329 ndr = ndr_pull_init_blob(&auth_blob, call, lp_iconv_convenience(call->conn->dce_ctx->lp_ctx));
334 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
335 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
338 ndr_err = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
339 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
344 /* check signature or unseal the packet */
345 switch (dce_conn->auth_state.auth_info->auth_level) {
346 case DCERPC_AUTH_LEVEL_PRIVACY:
347 status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
349 full_packet->data + DCERPC_REQUEST_LENGTH,
350 pkt->u.request.stub_and_verifier.length,
352 full_packet->length-auth.credentials.length,
354 memcpy(pkt->u.request.stub_and_verifier.data,
355 full_packet->data + DCERPC_REQUEST_LENGTH,
356 pkt->u.request.stub_and_verifier.length);
359 case DCERPC_AUTH_LEVEL_INTEGRITY:
360 status = gensec_check_packet(dce_conn->auth_state.gensec_security,
362 pkt->u.request.stub_and_verifier.data,
363 pkt->u.request.stub_and_verifier.length,
365 full_packet->length-auth.credentials.length,
369 case DCERPC_AUTH_LEVEL_CONNECT:
370 status = dcesrv_check_connect_verifier(&auth.credentials);
374 status = NT_STATUS_INVALID_LEVEL;
378 /* remove the indicated amount of padding */
379 if (pkt->u.request.stub_and_verifier.length < auth.auth_pad_length) {
383 pkt->u.request.stub_and_verifier.length -= auth.auth_pad_length;
386 return NT_STATUS_IS_OK(status);
391 push a signed or sealed dcerpc request packet into a blob
393 bool dcesrv_auth_response(struct dcesrv_call_state *call,
394 DATA_BLOB *blob, struct ncacn_packet *pkt)
396 struct dcesrv_connection *dce_conn = call->conn;
398 enum ndr_err_code ndr_err;
399 struct ndr_push *ndr;
400 uint32_t payload_length;
403 /* non-signed packets are simple */
404 if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.gensec_security) {
405 status = ncacn_push_auth(blob, call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx), pkt, NULL);
406 return NT_STATUS_IS_OK(status);
409 ndr = ndr_push_init_ctx(call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx));
414 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
415 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
418 ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
419 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
423 /* pad to 16 byte multiple, match win2k3 */
424 dce_conn->auth_state.auth_info->auth_pad_length = NDR_ALIGN(ndr, 16);
425 ndr_push_zero(ndr, dce_conn->auth_state.auth_info->auth_pad_length);
427 payload_length = ndr->offset - DCERPC_REQUEST_LENGTH;
429 if (dce_conn->auth_state.auth_info->auth_level == DCERPC_AUTH_LEVEL_CONNECT) {
430 status = dcesrv_connect_verifier(call,
431 &dce_conn->auth_state.auth_info->credentials);
432 if (!NT_STATUS_IS_OK(status)) {
437 /* We hope this length is accruate. If must be if the
438 * GENSEC mech does AEAD signing of the packet
440 dce_conn->auth_state.auth_info->credentials
441 = data_blob_talloc(call, NULL,
442 gensec_sig_size(dce_conn->auth_state.gensec_security,
444 data_blob_clear(&dce_conn->auth_state.auth_info->credentials);
447 /* add the auth verifier */
448 ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
449 dce_conn->auth_state.auth_info);
450 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
454 /* extract the whole packet as a blob */
455 *blob = ndr_push_blob(ndr);
457 /* fill in the fragment length and auth_length, we can't fill
458 in these earlier as we don't know the signature length (it
459 could be variable length) */
460 dcerpc_set_frag_length(blob, blob->length);
462 /* We hope this value is accruate. If must be if the GENSEC
463 * mech does AEAD signing of the packet headers */
464 dcerpc_set_auth_length(blob, dce_conn->auth_state.auth_info->credentials.length);
466 /* sign or seal the packet */
467 switch (dce_conn->auth_state.auth_info->auth_level) {
468 case DCERPC_AUTH_LEVEL_PRIVACY:
469 status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
471 ndr->data + DCERPC_REQUEST_LENGTH,
474 blob->length - dce_conn->auth_state.auth_info->credentials.length,
477 if (NT_STATUS_IS_OK(status)) {
478 blob->length -= dce_conn->auth_state.auth_info->credentials.length;
479 if (!data_blob_append(call, blob, creds2.data, creds2.length))
480 status = NT_STATUS_NO_MEMORY;
482 status = NT_STATUS_OK;
485 /* If we did AEAD signing of the packet headers, then we hope
486 * this value didn't change... */
487 dcerpc_set_auth_length(blob, creds2.length);
488 dcerpc_set_frag_length(blob, dcerpc_get_frag_length(blob)+creds2.length);
489 data_blob_free(&creds2);
492 case DCERPC_AUTH_LEVEL_INTEGRITY:
493 status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
495 ndr->data + DCERPC_REQUEST_LENGTH,
498 blob->length - dce_conn->auth_state.auth_info->credentials.length,
500 if (NT_STATUS_IS_OK(status)) {
501 blob->length -= dce_conn->auth_state.auth_info->credentials.length;
502 if (!data_blob_append(call, blob, creds2.data, creds2.length))
503 status = NT_STATUS_NO_MEMORY;
505 status = NT_STATUS_OK;
508 /* If we did AEAD signing of the packet headers, then we hope
509 * this value didn't change... */
510 dcerpc_set_auth_length(blob, creds2.length);
511 dcerpc_set_frag_length(blob, dcerpc_get_frag_length(blob)+creds2.length);
512 data_blob_free(&creds2);
515 case DCERPC_AUTH_LEVEL_CONNECT:
519 status = NT_STATUS_INVALID_LEVEL;
523 data_blob_free(&dce_conn->auth_state.auth_info->credentials);
525 if (!NT_STATUS_IS_OK(status)) {