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 2 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, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 startup the cryptographic side of an authenticated dcerpc server
29 NTSTATUS dcesrv_crypto_select_type(struct dcesrv_connection *dce_conn,
30 struct dcesrv_auth *auth)
33 if (auth->auth_info->auth_level != DCERPC_AUTH_LEVEL_INTEGRITY &&
34 auth->auth_info->auth_level != DCERPC_AUTH_LEVEL_PRIVACY &&
35 auth->auth_info->auth_level != DCERPC_AUTH_LEVEL_CONNECT) {
36 DEBUG(2,("auth_level %d not supported in dcesrv auth\n",
37 auth->auth_info->auth_level));
38 return NT_STATUS_INVALID_PARAMETER;
41 if (auth->gensec_security != NULL) {
43 * this this function should not be called
44 * twice per dcesrv_connection!
46 * so we need to find out the right
47 * dcerpc error to return
51 status = gensec_server_start(&auth->gensec_security);
52 if (!NT_STATUS_IS_OK(status)) {
53 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
57 status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_info->auth_type,
58 auth->auth_info->auth_level);
60 if (!NT_STATUS_IS_OK(status)) {
61 DEBUG(1, ("Failed to start GENSEC mech-specific server code (%d): %s\n",
62 (int)auth->auth_info->auth_type,
71 parse any auth information from a dcerpc bind request
72 return False if we can't handle the auth request for some
73 reason (in which case we send a bind_nak)
75 BOOL dcesrv_auth_bind(struct dcesrv_call_state *call)
77 struct dcerpc_packet *pkt = &call->pkt;
78 struct dcesrv_connection *dce_conn = call->conn;
81 if (pkt->u.bind.auth_info.length == 0) {
82 dce_conn->auth_state.auth_info = NULL;
86 dce_conn->auth_state.auth_info = talloc_p(dce_conn, struct dcerpc_auth);
87 if (!dce_conn->auth_state.auth_info) {
91 status = ndr_pull_struct_blob(&pkt->u.bind.auth_info,
93 dce_conn->auth_state.auth_info,
94 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
95 if (!NT_STATUS_IS_OK(status)) {
99 status = dcesrv_crypto_select_type(dce_conn, &dce_conn->auth_state);
100 if (!NT_STATUS_IS_OK(status)) {
108 add any auth information needed in a bind ack, and process the authentication
109 information found in the bind.
111 BOOL dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct dcerpc_packet *pkt)
113 struct dcesrv_connection *dce_conn = call->conn;
116 if (!call->conn->auth_state.gensec_security) {
120 status = gensec_update(dce_conn->auth_state.gensec_security,
122 dce_conn->auth_state.auth_info->credentials,
123 &dce_conn->auth_state.auth_info->credentials);
125 if (NT_STATUS_IS_OK(status)) {
126 status = gensec_session_info(dce_conn->auth_state.gensec_security,
127 &dce_conn->auth_state.session_info);
128 if (!NT_STATUS_IS_OK(status)) {
129 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
133 /* Now that we are authenticated, got back to the generic session key... */
134 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
136 } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
137 dce_conn->auth_state.auth_info->auth_pad_length = 0;
138 dce_conn->auth_state.auth_info->auth_reserved = 0;
141 DEBUG(2, ("Failed to start dcesrv auth negotiate: %s\n", nt_errstr(status)));
148 process the final stage of a auth request
150 BOOL dcesrv_auth_auth3(struct dcesrv_call_state *call)
152 struct dcerpc_packet *pkt = &call->pkt;
153 struct dcesrv_connection *dce_conn = call->conn;
156 /* We can't work without an existing gensec state, and an new blob to feed it */
157 if (!dce_conn->auth_state.auth_info ||
158 !dce_conn->auth_state.gensec_security ||
159 pkt->u.auth.auth_info.length == 0) {
163 status = ndr_pull_struct_blob(&pkt->u.auth.auth_info,
165 dce_conn->auth_state.auth_info,
166 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
167 if (!NT_STATUS_IS_OK(status)) {
171 /* Pass the extra data we got from the client down to gensec for processing */
172 status = gensec_update(dce_conn->auth_state.gensec_security,
174 dce_conn->auth_state.auth_info->credentials,
175 &dce_conn->auth_state.auth_info->credentials);
176 if (NT_STATUS_IS_OK(status)) {
177 status = gensec_session_info(dce_conn->auth_state.gensec_security,
178 &dce_conn->auth_state.session_info);
179 if (!NT_STATUS_IS_OK(status)) {
180 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
183 /* Now that we are authenticated, got back to the generic session key... */
184 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
187 DEBUG(4, ("dcesrv_auth_auth3: failed to authenticate: %s\n",
197 generate a CONNECT level verifier
199 static NTSTATUS dcesrv_connect_verifier(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
201 *blob = data_blob_talloc(mem_ctx, NULL, 16);
202 if (blob->data == NULL) {
203 return NT_STATUS_NO_MEMORY;
205 SIVAL(blob->data, 0, 1);
206 memset(blob->data+4, 0, 12);
211 generate a CONNECT level verifier
213 static NTSTATUS dcesrv_check_connect_verifier(DATA_BLOB *blob)
215 if (blob->length != 16 ||
216 IVAL(blob->data, 0) != 1) {
217 return NT_STATUS_ACCESS_DENIED;
224 check credentials on a request
226 BOOL dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
228 struct dcerpc_packet *pkt = &call->pkt;
229 struct dcesrv_connection *dce_conn = call->conn;
231 struct dcerpc_auth auth;
232 struct ndr_pull *ndr;
235 if (!dce_conn->auth_state.auth_info ||
236 !dce_conn->auth_state.gensec_security) {
240 auth_blob.length = 8 + pkt->auth_length;
242 /* check for a valid length */
243 if (pkt->u.request.stub_and_verifier.length < auth_blob.length) {
248 pkt->u.request.stub_and_verifier.data +
249 pkt->u.request.stub_and_verifier.length - auth_blob.length;
250 pkt->u.request.stub_and_verifier.length -= auth_blob.length;
252 /* pull the auth structure */
253 ndr = ndr_pull_init_blob(&auth_blob, call);
258 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
259 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
262 status = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
263 if (!NT_STATUS_IS_OK(status)) {
268 /* check signature or unseal the packet */
269 switch (dce_conn->auth_state.auth_info->auth_level) {
270 case DCERPC_AUTH_LEVEL_PRIVACY:
271 status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
273 full_packet->data + DCERPC_REQUEST_LENGTH,
274 pkt->u.request.stub_and_verifier.length,
276 full_packet->length-auth.credentials.length,
278 memcpy(pkt->u.request.stub_and_verifier.data,
279 full_packet->data + DCERPC_REQUEST_LENGTH,
280 pkt->u.request.stub_and_verifier.length);
283 case DCERPC_AUTH_LEVEL_INTEGRITY:
284 status = gensec_check_packet(dce_conn->auth_state.gensec_security,
286 pkt->u.request.stub_and_verifier.data,
287 pkt->u.request.stub_and_verifier.length,
289 full_packet->length-auth.credentials.length,
293 case DCERPC_AUTH_LEVEL_CONNECT:
294 status = dcesrv_check_connect_verifier(&auth.credentials);
298 status = NT_STATUS_INVALID_LEVEL;
302 /* remove the indicated amount of padding */
303 if (pkt->u.request.stub_and_verifier.length < auth.auth_pad_length) {
307 pkt->u.request.stub_and_verifier.length -= auth.auth_pad_length;
310 return NT_STATUS_IS_OK(status);
315 push a signed or sealed dcerpc request packet into a blob
317 BOOL dcesrv_auth_response(struct dcesrv_call_state *call,
318 DATA_BLOB *blob, struct dcerpc_packet *pkt)
320 struct dcesrv_connection *dce_conn = call->conn;
322 struct ndr_push *ndr;
323 uint32_t payload_length;
325 /* non-signed packets are simple */
326 if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.gensec_security) {
327 status = dcerpc_push_auth(blob, call, pkt, NULL);
328 return NT_STATUS_IS_OK(status);
331 ndr = ndr_push_init_ctx(call);
336 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
337 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
340 status = ndr_push_dcerpc_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
341 if (!NT_STATUS_IS_OK(status)) {
345 /* pad to 8 byte multiple */
346 dce_conn->auth_state.auth_info->auth_pad_length = NDR_ALIGN(ndr, 8);
347 ndr_push_zero(ndr, dce_conn->auth_state.auth_info->auth_pad_length);
349 payload_length = ndr->offset - DCERPC_REQUEST_LENGTH;
351 if (dce_conn->auth_state.auth_info->auth_level == DCERPC_AUTH_LEVEL_CONNECT) {
352 status = dcesrv_connect_verifier(call,
353 &dce_conn->auth_state.auth_info->credentials);
354 if (!NT_STATUS_IS_OK(status)) {
358 dce_conn->auth_state.auth_info->credentials
359 = data_blob_talloc(call, NULL,
360 gensec_sig_size(dce_conn->auth_state.gensec_security));
363 /* add the auth verifier */
364 status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, dce_conn->auth_state.auth_info);
365 if (!NT_STATUS_IS_OK(status)) {
369 /* extract the whole packet as a blob */
370 *blob = ndr_push_blob(ndr);
372 /* fill in the fragment length and auth_length, we can't fill
373 in these earlier as we don't know the signature length (it
374 could be variable length) */
375 dcerpc_set_frag_length(blob, blob->length);
376 dcerpc_set_auth_length(blob, dce_conn->auth_state.auth_info->credentials.length);
378 /* sign or seal the packet */
379 switch (dce_conn->auth_state.auth_info->auth_level) {
380 case DCERPC_AUTH_LEVEL_PRIVACY:
381 status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
383 ndr->data + DCERPC_REQUEST_LENGTH,
386 blob->length - dce_conn->auth_state.auth_info->credentials.length,
387 &dce_conn->auth_state.auth_info->credentials);
390 case DCERPC_AUTH_LEVEL_INTEGRITY:
391 status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
393 ndr->data + DCERPC_REQUEST_LENGTH,
396 blob->length - dce_conn->auth_state.auth_info->credentials.length,
397 &dce_conn->auth_state.auth_info->credentials);
401 case DCERPC_AUTH_LEVEL_CONNECT:
405 status = NT_STATUS_INVALID_LEVEL;
409 if (!NT_STATUS_IS_OK(status)) {
413 memcpy(blob->data + blob->length - dce_conn->auth_state.auth_info->credentials.length,
414 dce_conn->auth_state.auth_info->credentials.data, dce_conn->auth_state.auth_info->credentials.length);
416 data_blob_free(&dce_conn->auth_state.auth_info->credentials);