differences incurred by rebasing - thanks Linus
[strongswan.git] / src / libpts / plugins / imc_attestation / imc_attestation.c
1 /*
2 * Copyright (C) 2011 Sansar Choinyambuu
3 * HSR Hochschule fuer Technik Rapperswil
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 */
15
16 #include "imc_attestation_state.h"
17 #include "imc_attestation_process.h"
18
19 #include <imc/imc_agent.h>
20 #include <pa_tnc/pa_tnc_msg.h>
21 #include <ietf/ietf_attr.h>
22 #include <ietf/ietf_attr_pa_tnc_error.h>
23 #include <ietf/ietf_attr_product_info.h>
24
25 #include <libpts.h>
26
27 #include <pts/pts_error.h>
28
29 #include <tcg/tcg_pts_attr_proto_caps.h>
30 #include <tcg/tcg_pts_attr_meas_algo.h>
31
32 #include <tncif_pa_subtypes.h>
33
34 #include <pen/pen.h>
35 #include <debug.h>
36 #include <utils/linked_list.h>
37
38 /* IMC definitions */
39
40 static const char imc_name[] = "Attestation";
41
42 #define IMC_VENDOR_ID PEN_TCG
43 #define IMC_SUBTYPE PA_SUBTYPE_TCG_PTS
44
45 static imc_agent_t *imc_attestation;
46
47 /**
48 * Supported PTS measurement algorithms
49 */
50 static pts_meas_algorithms_t supported_algorithms = PTS_MEAS_ALGO_NONE;
51
52 /**
53 * Supported PTS Diffie Hellman Groups
54 */
55 static pts_dh_group_t supported_dh_groups = PTS_DH_GROUP_NONE;
56
57 /**
58 * see section 3.7.1 of TCG TNC IF-IMC Specification 1.2
59 */
60 TNC_Result TNC_IMC_Initialize(TNC_IMCID imc_id,
61 TNC_Version min_version,
62 TNC_Version max_version,
63 TNC_Version *actual_version)
64 {
65 if (imc_attestation)
66 {
67 DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
68 return TNC_RESULT_ALREADY_INITIALIZED;
69 }
70 if (!pts_meas_algo_probe(&supported_algorithms) ||
71 !pts_dh_group_probe(&supported_dh_groups))
72 {
73 return TNC_RESULT_FATAL;
74 }
75 imc_attestation = imc_agent_create(imc_name, IMC_VENDOR_ID, IMC_SUBTYPE,
76 imc_id, actual_version);
77 if (!imc_attestation)
78 {
79 return TNC_RESULT_FATAL;
80 }
81
82 libpts_init();
83
84 if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1)
85 {
86 DBG1(DBG_IMC, "no common IF-IMC version");
87 return TNC_RESULT_NO_COMMON_VERSION;
88 }
89 return TNC_RESULT_SUCCESS;
90 }
91
92 /**
93 * see section 3.7.2 of TCG TNC IF-IMC Specification 1.2
94 */
95 TNC_Result TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id,
96 TNC_ConnectionID connection_id,
97 TNC_ConnectionState new_state)
98 {
99 imc_state_t *state;
100
101 if (!imc_attestation)
102 {
103 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
104 return TNC_RESULT_NOT_INITIALIZED;
105 }
106 switch (new_state)
107 {
108 case TNC_CONNECTION_STATE_CREATE:
109 state = imc_attestation_state_create(connection_id);
110 return imc_attestation->create_state(imc_attestation, state);
111 case TNC_CONNECTION_STATE_DELETE:
112 return imc_attestation->delete_state(imc_attestation, connection_id);
113 case TNC_CONNECTION_STATE_HANDSHAKE:
114 case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
115 case TNC_CONNECTION_STATE_ACCESS_NONE:
116 default:
117 return imc_attestation->change_state(imc_attestation, connection_id,
118 new_state, NULL);
119 }
120 }
121
122
123 /**
124 * see section 3.7.3 of TCG TNC IF-IMC Specification 1.2
125 */
126 TNC_Result TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
127 TNC_ConnectionID connection_id)
128 {
129 imc_state_t *state;
130 imc_attestation_state_t *attestation_state;
131 pts_t *pts;
132 char *platform_info;
133 TNC_Result result = TNC_RESULT_SUCCESS;
134
135 if (!imc_attestation)
136 {
137 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
138 return TNC_RESULT_NOT_INITIALIZED;
139 }
140
141 /* get current IMC state */
142 if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
143 {
144 return TNC_RESULT_FATAL;
145 }
146 attestation_state = (imc_attestation_state_t*)state;
147 pts = attestation_state->get_pts(attestation_state);
148
149 platform_info = pts->get_platform_info(pts);
150 if (platform_info)
151 {
152 pa_tnc_msg_t *pa_tnc_msg;
153 pa_tnc_attr_t *attr;
154
155 pa_tnc_msg = pa_tnc_msg_create();
156 attr = ietf_attr_product_info_create(0, 0, platform_info);
157 pa_tnc_msg->add_attribute(pa_tnc_msg, attr);
158 pa_tnc_msg->build(pa_tnc_msg);
159 result = imc_attestation->send_message(imc_attestation, connection_id,
160 pa_tnc_msg->get_encoding(pa_tnc_msg));
161 pa_tnc_msg->destroy(pa_tnc_msg);
162 }
163
164 return result;
165 }
166
167 /**
168 * see section 3.7.4 of TCG TNC IF-IMC Specification 1.2
169 */
170 TNC_Result TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
171 TNC_ConnectionID connection_id,
172 TNC_BufferReference msg,
173 TNC_UInt32 msg_len,
174 TNC_MessageType msg_type)
175 {
176 pa_tnc_msg_t *pa_tnc_msg;
177 pa_tnc_attr_t *attr;
178 linked_list_t *attr_list;
179 imc_state_t *state;
180 imc_attestation_state_t *attestation_state;
181 enumerator_t *enumerator;
182 TNC_Result result;
183
184 if (!imc_attestation)
185 {
186 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
187 return TNC_RESULT_NOT_INITIALIZED;
188 }
189
190 /* get current IMC state */
191 if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
192 {
193 return TNC_RESULT_FATAL;
194 }
195 attestation_state = (imc_attestation_state_t*)state;
196
197 /* parse received PA-TNC message and automatically handle any errors */
198 result = imc_attestation->receive_message(imc_attestation, connection_id,
199 chunk_create(msg, msg_len), msg_type,
200 &pa_tnc_msg);
201
202 /* no parsed PA-TNC attributes available if an error occurred */
203 if (!pa_tnc_msg)
204 {
205 return result;
206 }
207
208 attr_list = linked_list_create();
209 result = TNC_RESULT_SUCCESS;
210
211 /* analyze PA-TNC attributes */
212 enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
213 while (enumerator->enumerate(enumerator, &attr))
214 {
215 if (attr->get_vendor_id(attr) == PEN_IETF &&
216 attr->get_type(attr) == IETF_ATTR_PA_TNC_ERROR)
217 {
218 ietf_attr_pa_tnc_error_t *error_attr;
219 pa_tnc_error_code_t error_code;
220 chunk_t msg_info, attr_info;
221 u_int32_t offset;
222
223 error_attr = (ietf_attr_pa_tnc_error_t*)attr;
224 error_code = error_attr->get_error_code(error_attr);
225 msg_info = error_attr->get_msg_info(error_attr);
226
227 DBG1(DBG_IMC, "received PA-TNC error '%N' concerning message %#B",
228 pa_tnc_error_code_names, error_code, &msg_info);
229 switch (error_code)
230 {
231 case PA_ERROR_INVALID_PARAMETER:
232 offset = error_attr->get_offset(error_attr);
233 DBG1(DBG_IMC, " occurred at offset of %u bytes", offset);
234 break;
235 case PA_ERROR_ATTR_TYPE_NOT_SUPPORTED:
236 attr_info = error_attr->get_attr_info(error_attr);
237 DBG1(DBG_IMC, " unsupported attribute %#B", &attr_info);
238 break;
239 default:
240 break;
241 }
242 result = TNC_RESULT_FATAL;
243 }
244 else if (attr->get_vendor_id(attr) == PEN_TCG)
245 {
246 if (!imc_attestation_process(attr, attr_list, attestation_state,
247 supported_algorithms, supported_dh_groups))
248 {
249 result = TNC_RESULT_FATAL;
250 break;
251 }
252 }
253 }
254 enumerator->destroy(enumerator);
255 pa_tnc_msg->destroy(pa_tnc_msg);
256
257 if (result == TNC_RESULT_SUCCESS && attr_list->get_count(attr_list))
258 {
259 pa_tnc_msg = pa_tnc_msg_create();
260
261 enumerator = attr_list->create_enumerator(attr_list);
262 while (enumerator->enumerate(enumerator, &attr))
263 {
264 pa_tnc_msg->add_attribute(pa_tnc_msg, attr);
265 }
266 enumerator->destroy(enumerator);
267
268 pa_tnc_msg->build(pa_tnc_msg);
269 result = imc_attestation->send_message(imc_attestation, connection_id,
270 pa_tnc_msg->get_encoding(pa_tnc_msg));
271 pa_tnc_msg->destroy(pa_tnc_msg);
272 }
273
274 attr_list->destroy(attr_list);
275 return result;
276 }
277
278 /**
279 * see section 3.7.5 of TCG TNC IF-IMC Specification 1.2
280 */
281 TNC_Result TNC_IMC_BatchEnding(TNC_IMCID imc_id,
282 TNC_ConnectionID connection_id)
283 {
284 if (!imc_attestation)
285 {
286 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
287 return TNC_RESULT_NOT_INITIALIZED;
288 }
289 return TNC_RESULT_SUCCESS;
290 }
291
292 /**
293 * see section 3.7.6 of TCG TNC IF-IMC Specification 1.2
294 */
295 TNC_Result TNC_IMC_Terminate(TNC_IMCID imc_id)
296 {
297 if (!imc_attestation)
298 {
299 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
300 return TNC_RESULT_NOT_INITIALIZED;
301 }
302
303 libpts_deinit();
304
305 imc_attestation->destroy(imc_attestation);
306 imc_attestation = NULL;
307
308 return TNC_RESULT_SUCCESS;
309 }
310
311 /**
312 * see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.2
313 */
314 TNC_Result TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
315 TNC_TNCC_BindFunctionPointer bind_function)
316 {
317 if (!imc_attestation)
318 {
319 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
320 return TNC_RESULT_NOT_INITIALIZED;
321 }
322 return imc_attestation->bind_functions(imc_attestation, bind_function);
323 }