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 DEBUG(2,("auth_level %d not supported in dcesrv auth\n",
36 auth->auth_info->auth_level));
37 return NT_STATUS_INVALID_PARAMETER;
40 if (auth->gensec_security != NULL) {
42 * this this function should not be called
43 * twice per dcesrv_connection!
45 * so we need to find out the right
46 * dcerpc error to return
50 status = gensec_server_start(&auth->gensec_security);
51 if (!NT_STATUS_IS_OK(status)) {
52 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
56 status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_info->auth_type,
57 auth->auth_info->auth_level);
59 if (!NT_STATUS_IS_OK(status)) {
60 DEBUG(1, ("Failed to start GENSEC mech-specific server code (%d): %s\n",
61 (int)auth->auth_info->auth_type,
70 parse any auth information from a dcerpc bind request
71 return False if we can't handle the auth request for some
72 reason (in which case we send a bind_nak)
74 BOOL dcesrv_auth_bind(struct dcesrv_call_state *call)
76 struct dcerpc_packet *pkt = &call->pkt;
77 struct dcesrv_connection *dce_conn = call->conn;
80 if (pkt->u.bind.auth_info.length == 0) {
81 dce_conn->auth_state.auth_info = NULL;
85 dce_conn->auth_state.auth_info = talloc_p(dce_conn->mem_ctx, struct dcerpc_auth);
86 if (!dce_conn->auth_state.auth_info) {
90 status = ndr_pull_struct_blob(&pkt->u.bind.auth_info,
92 dce_conn->auth_state.auth_info,
93 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
94 if (!NT_STATUS_IS_OK(status)) {
98 status = dcesrv_crypto_select_type(dce_conn, &dce_conn->auth_state);
99 if (!NT_STATUS_IS_OK(status)) {
107 add any auth information needed in a bind ack, and process the authentication
108 information found in the bind.
110 BOOL dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct dcerpc_packet *pkt)
112 struct dcesrv_connection *dce_conn = call->conn;
115 if (!call->conn->auth_state.gensec_security) {
119 status = gensec_update(dce_conn->auth_state.gensec_security,
121 dce_conn->auth_state.auth_info->credentials,
122 &dce_conn->auth_state.auth_info->credentials);
124 if (NT_STATUS_IS_OK(status)) {
125 status = gensec_session_info(dce_conn->auth_state.gensec_security,
126 &dce_conn->auth_state.session_info);
127 if (!NT_STATUS_IS_OK(status)) {
128 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
132 /* Now that we are authenticated, got back to the generic session key... */
133 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
135 } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
136 dce_conn->auth_state.auth_info->auth_pad_length = 0;
137 dce_conn->auth_state.auth_info->auth_reserved = 0;
140 DEBUG(2, ("Failed to start dcesrv auth negotiate: %s\n", nt_errstr(status)));
147 process the final stage of a auth request
149 BOOL dcesrv_auth_auth3(struct dcesrv_call_state *call)
151 struct dcerpc_packet *pkt = &call->pkt;
152 struct dcesrv_connection *dce_conn = call->conn;
155 /* We can't work without an existing gensec state, and an new blob to feed it */
156 if (!dce_conn->auth_state.auth_info ||
157 !dce_conn->auth_state.gensec_security ||
158 pkt->u.auth.auth_info.length == 0) {
162 status = ndr_pull_struct_blob(&pkt->u.auth.auth_info,
164 dce_conn->auth_state.auth_info,
165 (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
166 if (!NT_STATUS_IS_OK(status)) {
170 /* Pass the extra data we got from the client down to gensec for processing */
171 status = gensec_update(dce_conn->auth_state.gensec_security,
173 dce_conn->auth_state.auth_info->credentials,
174 &dce_conn->auth_state.auth_info->credentials);
175 if (NT_STATUS_IS_OK(status)) {
176 status = gensec_session_info(dce_conn->auth_state.gensec_security,
177 &dce_conn->auth_state.session_info);
178 if (!NT_STATUS_IS_OK(status)) {
179 DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
182 /* Now that we are authenticated, got back to the generic session key... */
183 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
186 DEBUG(4, ("dcesrv_auth_auth3: failed to authenticate: %s\n",
195 check credentials on a request
197 BOOL dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
199 struct dcerpc_packet *pkt = &call->pkt;
200 struct dcesrv_connection *dce_conn = call->conn;
202 struct dcerpc_auth auth;
203 struct ndr_pull *ndr;
206 if (!dce_conn->auth_state.auth_info ||
207 !dce_conn->auth_state.gensec_security) {
211 auth_blob.length = 8 + pkt->auth_length;
213 /* check for a valid length */
214 if (pkt->u.request.stub_and_verifier.length < auth_blob.length) {
219 pkt->u.request.stub_and_verifier.data +
220 pkt->u.request.stub_and_verifier.length - auth_blob.length;
221 pkt->u.request.stub_and_verifier.length -= auth_blob.length;
223 /* pull the auth structure */
224 ndr = ndr_pull_init_blob(&auth_blob, call->mem_ctx);
229 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
230 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
233 status = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
234 if (!NT_STATUS_IS_OK(status)) {
238 /* check signature or unseal the packet */
239 switch (dce_conn->auth_state.auth_info->auth_level) {
240 case DCERPC_AUTH_LEVEL_PRIVACY:
241 status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
243 pkt->u.request.stub_and_verifier.data,
244 pkt->u.request.stub_and_verifier.length,
246 full_packet->length-auth.credentials.length,
250 case DCERPC_AUTH_LEVEL_INTEGRITY:
251 status = gensec_check_packet(dce_conn->auth_state.gensec_security,
253 pkt->u.request.stub_and_verifier.data,
254 pkt->u.request.stub_and_verifier.length,
256 full_packet->length-auth.credentials.length,
261 status = NT_STATUS_INVALID_LEVEL;
265 /* remove the indicated amount of padding */
266 if (pkt->u.request.stub_and_verifier.length < auth.auth_pad_length) {
269 pkt->u.request.stub_and_verifier.length -= auth.auth_pad_length;
271 return NT_STATUS_IS_OK(status);
276 push a signed or sealed dcerpc request packet into a blob
278 BOOL dcesrv_auth_response(struct dcesrv_call_state *call,
279 DATA_BLOB *blob, struct dcerpc_packet *pkt)
281 struct dcesrv_connection *dce_conn = call->conn;
283 struct ndr_push *ndr;
284 uint32_t payload_length;
286 /* non-signed packets are simple */
287 if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.gensec_security) {
288 status = dcerpc_push_auth(blob, call->mem_ctx, pkt, NULL);
289 return NT_STATUS_IS_OK(status);
292 ndr = ndr_push_init_ctx(call->mem_ctx);
297 if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
298 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
301 status = ndr_push_dcerpc_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
302 if (!NT_STATUS_IS_OK(status)) {
306 /* pad to 8 byte multiple */
307 dce_conn->auth_state.auth_info->auth_pad_length = NDR_ALIGN(ndr, 8);
308 ndr_push_zero(ndr, dce_conn->auth_state.auth_info->auth_pad_length);
310 payload_length = ndr->offset - DCERPC_REQUEST_LENGTH;
312 dce_conn->auth_state.auth_info->credentials
313 = data_blob_talloc(call->mem_ctx, NULL,
314 gensec_sig_size(dce_conn->auth_state.gensec_security));
316 /* add the auth verifier */
317 status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, dce_conn->auth_state.auth_info);
318 if (!NT_STATUS_IS_OK(status)) {
322 /* extract the whole packet as a blob */
323 *blob = ndr_push_blob(ndr);
325 /* fill in the fragment length and auth_length, we can't fill
326 in these earlier as we don't know the signature length (it
327 could be variable length) */
328 dcerpc_set_frag_length(blob, blob->length);
329 dcerpc_set_auth_length(blob, dce_conn->auth_state.auth_info->credentials.length);
331 /* sign or seal the packet */
332 switch (dce_conn->auth_state.auth_info->auth_level) {
333 case DCERPC_AUTH_LEVEL_PRIVACY:
334 status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
336 ndr->data + DCERPC_REQUEST_LENGTH,
339 blob->length - dce_conn->auth_state.auth_info->credentials.length,
340 &dce_conn->auth_state.auth_info->credentials);
343 case DCERPC_AUTH_LEVEL_INTEGRITY:
344 status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
346 ndr->data + DCERPC_REQUEST_LENGTH,
349 blob->length - dce_conn->auth_state.auth_info->credentials.length,
350 &dce_conn->auth_state.auth_info->credentials);
354 status = NT_STATUS_INVALID_LEVEL;
358 if (!NT_STATUS_IS_OK(status)) {
362 memcpy(blob->data + blob->length - dce_conn->auth_state.auth_info->credentials.length,
363 dce_conn->auth_state.auth_info->credentials.data, dce_conn->auth_state.auth_info->credentials.length);
365 data_blob_free(&dce_conn->auth_state.auth_info->credentials);