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DEFINITIONS
This source file includes following definitions.
- schannel_sig_size
- schannel_session_key
- schannel_update
- dcerpc_schannel_creds
- schannel_session_info
- schannel_start
- schannel_server_start
- schannel_client_start
- schannel_have_feature
- gensec_schannel_init
1 /*
2 Unix SMB/CIFS implementation.
3
4 dcerpc schannel operations
5
6 Copyright (C) Andrew Tridgell 2004
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
8
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.
13
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.
18
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/>.
21 */
22
23 #include "includes.h"
24 #include "librpc/gen_ndr/ndr_schannel.h"
25 #include "auth/auth.h"
26 #include "auth/credentials/credentials.h"
27 #include "auth/gensec/gensec.h"
28 #include "auth/gensec/gensec_proto.h"
29 #include "auth/gensec/schannel.h"
30 #include "auth/gensec/schannel_state.h"
31 #include "auth/gensec/schannel_proto.h"
32 #include "librpc/rpc/dcerpc.h"
33 #include "param/param.h"
34 #include "auth/session_proto.h"
35
36 static size_t schannel_sig_size(struct gensec_security *gensec_security, size_t data_size)
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37 {
38 return 32;
39 }
40
41 static NTSTATUS schannel_session_key(struct gensec_security *gensec_security,
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42 DATA_BLOB *session_key)
43 {
44 return NT_STATUS_NOT_IMPLEMENTED;
45 }
46
47 static NTSTATUS schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
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48 const DATA_BLOB in, DATA_BLOB *out)
49 {
50 struct schannel_state *state = (struct schannel_state *)gensec_security->private_data;
51 NTSTATUS status;
52 enum ndr_err_code ndr_err;
53 struct schannel_bind bind_schannel;
54 struct schannel_bind_ack bind_schannel_ack;
55 struct creds_CredentialState *creds;
56
57 const char *workstation;
58 const char *domain;
59 *out = data_blob(NULL, 0);
60
61 switch (gensec_security->gensec_role) {
62 case GENSEC_CLIENT:
63 if (state->state != SCHANNEL_STATE_START) {
64 /* we could parse the bind ack, but we don't know what it is yet */
65 return NT_STATUS_OK;
66 }
67
68 state->creds = talloc_reference(state, cli_credentials_get_netlogon_creds(gensec_security->credentials));
69
70 bind_schannel.unknown1 = 0;
71 #if 0
72 /* to support this we'd need to have access to the full domain name */
73 bind_schannel.bind_type = 23;
74 bind_schannel.u.info23.domain = cli_credentials_get_domain(gensec_security->credentials);
75 bind_schannel.u.info23.workstation = cli_credentials_get_workstation(gensec_security->credentials);
76 bind_schannel.u.info23.dnsdomain = cli_credentials_get_realm(gensec_security->credentials);
77 /* w2k3 refuses us if we use the full DNS workstation?
78 why? perhaps because we don't fill in the dNSHostName
79 attribute in the machine account? */
80 bind_schannel.u.info23.dnsworkstation = cli_credentials_get_workstation(gensec_security->credentials);
81 #else
82 bind_schannel.bind_type = 3;
83 bind_schannel.u.info3.domain = cli_credentials_get_domain(gensec_security->credentials);
84 bind_schannel.u.info3.workstation = cli_credentials_get_workstation(gensec_security->credentials);
85 #endif
86
87 ndr_err = ndr_push_struct_blob(out, out_mem_ctx,
88 gensec_security->settings->iconv_convenience, &bind_schannel,
89 (ndr_push_flags_fn_t)ndr_push_schannel_bind);
90 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
91 status = ndr_map_error2ntstatus(ndr_err);
92 DEBUG(3, ("Could not create schannel bind: %s\n",
93 nt_errstr(status)));
94 return status;
95 }
96
97 state->state = SCHANNEL_STATE_UPDATE_1;
98
99 return NT_STATUS_MORE_PROCESSING_REQUIRED;
100 case GENSEC_SERVER:
101
102 if (state->state != SCHANNEL_STATE_START) {
103 /* no third leg on this protocol */
104 return NT_STATUS_INVALID_PARAMETER;
105 }
106
107 /* parse the schannel startup blob */
108 ndr_err = ndr_pull_struct_blob(&in, out_mem_ctx,
109 gensec_security->settings->iconv_convenience,
110 &bind_schannel,
111 (ndr_pull_flags_fn_t)ndr_pull_schannel_bind);
112 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
113 status = ndr_map_error2ntstatus(ndr_err);
114 DEBUG(3, ("Could not parse incoming schannel bind: %s\n",
115 nt_errstr(status)));
116 return status;
117 }
118
119 if (bind_schannel.bind_type == 23) {
120 workstation = bind_schannel.u.info23.workstation;
121 domain = bind_schannel.u.info23.domain;
122 } else {
123 workstation = bind_schannel.u.info3.workstation;
124 domain = bind_schannel.u.info3.domain;
125 }
126
127 /* pull the session key for this client */
128 status = schannel_fetch_session_key(out_mem_ctx, gensec_security->event_ctx,
129 gensec_security->settings->lp_ctx, workstation,
130 domain, &creds);
131 if (!NT_STATUS_IS_OK(status)) {
132 DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
133 workstation, nt_errstr(status)));
134 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
135 return NT_STATUS_LOGON_FAILURE;
136 }
137 return status;
138 }
139
140 state->creds = talloc_reference(state, creds);
141
142 bind_schannel_ack.unknown1 = 1;
143 bind_schannel_ack.unknown2 = 0;
144 bind_schannel_ack.unknown3 = 0x6c0000;
145
146 ndr_err = ndr_push_struct_blob(out, out_mem_ctx,
147 gensec_security->settings->iconv_convenience, &bind_schannel_ack,
148 (ndr_push_flags_fn_t)ndr_push_schannel_bind_ack);
149 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
150 status = ndr_map_error2ntstatus(ndr_err);
151 DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
152 workstation, nt_errstr(status)));
153 return status;
154 }
155
156 state->state = SCHANNEL_STATE_UPDATE_1;
157
158 return NT_STATUS_OK;
159 }
160 return NT_STATUS_INVALID_PARAMETER;
161 }
162
163 /**
164 * Return the struct creds_CredentialState.
165 *
166 * Make sure not to call this unless gensec is using schannel...
167 */
168
169 /* TODO: make this non-public */
170 _PUBLIC_ NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
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171 TALLOC_CTX *mem_ctx,
172 struct creds_CredentialState **creds)
173 {
174 struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
175
176 *creds = talloc_reference(mem_ctx, state->creds);
177 if (!*creds) {
178 return NT_STATUS_NO_MEMORY;
179 }
180 return NT_STATUS_OK;
181 }
182
183
184 /**
185 * Returns anonymous credentials for schannel, matching Win2k3.
186 *
187 */
188
189 static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
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190 struct auth_session_info **_session_info)
191 {
192 struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
193 return auth_anonymous_session_info(state, gensec_security->event_ctx, gensec_security->settings->lp_ctx, _session_info);
194 }
195
196 static NTSTATUS schannel_start(struct gensec_security *gensec_security)
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197 {
198 struct schannel_state *state;
199
200 state = talloc(gensec_security, struct schannel_state);
201 if (!state) {
202 return NT_STATUS_NO_MEMORY;
203 }
204
205 state->state = SCHANNEL_STATE_START;
206 state->seq_num = 0;
207 gensec_security->private_data = state;
208
209 return NT_STATUS_OK;
210 }
211
212 static NTSTATUS schannel_server_start(struct gensec_security *gensec_security)
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213 {
214 NTSTATUS status;
215 struct schannel_state *state;
216
217 status = schannel_start(gensec_security);
218 if (!NT_STATUS_IS_OK(status)) {
219 return status;
220 }
221
222 state = (struct schannel_state *)gensec_security->private_data;
223 state->initiator = false;
224
225 return NT_STATUS_OK;
226 }
227
228 static NTSTATUS schannel_client_start(struct gensec_security *gensec_security)
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229 {
230 NTSTATUS status;
231 struct schannel_state *state;
232
233 status = schannel_start(gensec_security);
234 if (!NT_STATUS_IS_OK(status)) {
235 return status;
236 }
237
238 state = (struct schannel_state *)gensec_security->private_data;
239 state->initiator = true;
240
241 return NT_STATUS_OK;
242 }
243
244
245 static bool schannel_have_feature(struct gensec_security *gensec_security,
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246 uint32_t feature)
247 {
248 if (feature & (GENSEC_FEATURE_SIGN |
249 GENSEC_FEATURE_SEAL)) {
250 return true;
251 }
252 if (feature & GENSEC_FEATURE_DCE_STYLE) {
253 return true;
254 }
255 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
256 return true;
257 }
258 return false;
259 }
260
261
262 static const struct gensec_security_ops gensec_schannel_security_ops = {
263 .name = "schannel",
264 .auth_type = DCERPC_AUTH_TYPE_SCHANNEL,
265 .client_start = schannel_client_start,
266 .server_start = schannel_server_start,
267 .update = schannel_update,
268 .seal_packet = schannel_seal_packet,
269 .sign_packet = schannel_sign_packet,
270 .check_packet = schannel_check_packet,
271 .unseal_packet = schannel_unseal_packet,
272 .session_key = schannel_session_key,
273 .session_info = schannel_session_info,
274 .sig_size = schannel_sig_size,
275 .have_feature = schannel_have_feature,
276 .enabled = true,
277 .priority = GENSEC_SCHANNEL
278 };
279
280 _PUBLIC_ NTSTATUS gensec_schannel_init(void)
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281 {
282 NTSTATUS ret;
283 ret = gensec_register(&gensec_schannel_security_ops);
284 if (!NT_STATUS_IS_OK(ret)) {
285 DEBUG(0,("Failed to register '%s' gensec backend!\n",
286 gensec_schannel_security_ops.name));
287 return ret;
288 }
289
290 return ret;
291 }