transfer IMA file measurements via PA-TNC
[strongswan.git] / src / libpts / plugins / imc_attestation / imc_attestation.c
1 /*
2 * Copyright (C) 2011-2012 Sansar Choinyambuu, Andreas Steffen
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 3.8.1 of TCG TNC IF-IMC Specification 1.3
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 3.8.2 of TCG TNC IF-IMC Specification 1.3
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 3.8.3 of TCG TNC IF-IMC Specification 1.3
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 linked_list_t *attr_list;
153 pa_tnc_attr_t *attr;
154
155 attr_list = linked_list_create();
156 attr = ietf_attr_product_info_create(0, 0, platform_info);
157 attr_list->insert_last(attr_list, attr);
158 result = imc_attestation->send_message(imc_attestation, connection_id,
159 FALSE, 0, TNC_IMVID_ANY, attr_list);
160 attr_list->destroy(attr_list);
161 }
162
163 return result;
164 }
165
166 static TNC_Result receive_message(TNC_IMCID imc_id,
167 TNC_ConnectionID connection_id,
168 TNC_UInt32 msg_flags,
169 chunk_t msg,
170 TNC_VendorID msg_vid,
171 TNC_MessageSubtype msg_subtype,
172 TNC_UInt32 src_imv_id,
173 TNC_UInt32 dst_imc_id)
174 {
175 pa_tnc_msg_t *pa_tnc_msg;
176 pa_tnc_attr_t *attr;
177 linked_list_t *attr_list;
178 imc_state_t *state;
179 imc_attestation_state_t *attestation_state;
180 enumerator_t *enumerator;
181 TNC_Result result;
182
183 if (!imc_attestation)
184 {
185 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
186 return TNC_RESULT_NOT_INITIALIZED;
187 }
188
189 /* get current IMC state */
190 if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
191 {
192 return TNC_RESULT_FATAL;
193 }
194 attestation_state = (imc_attestation_state_t*)state;
195
196 /* parse received PA-TNC message and automatically handle any errors */
197 result = imc_attestation->receive_message(imc_attestation, state, msg,
198 msg_vid, msg_subtype, src_imv_id, dst_imc_id, &pa_tnc_msg);
199
200 /* no parsed PA-TNC attributes available if an error occurred */
201 if (!pa_tnc_msg)
202 {
203 return result;
204 }
205
206 /* preprocess any IETF standard error attributes */
207 result = pa_tnc_msg->process_ietf_std_errors(pa_tnc_msg) ?
208 TNC_RESULT_FATAL : TNC_RESULT_SUCCESS;
209
210 attr_list = linked_list_create();
211
212 /* analyze PA-TNC attributes */
213 enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
214 while (enumerator->enumerate(enumerator, &attr))
215 {
216 if (attr->get_vendor_id(attr) == PEN_IETF &&
217 attr->get_type(attr) == IETF_ATTR_PA_TNC_ERROR)
218 {
219 ietf_attr_pa_tnc_error_t *error_attr;
220 pen_t error_vendor_id;
221 pa_tnc_error_code_t error_code;
222 chunk_t msg_info;
223
224 error_attr = (ietf_attr_pa_tnc_error_t*)attr;
225 error_vendor_id = error_attr->get_vendor_id(error_attr);
226
227 if (error_vendor_id == PEN_TCG)
228 {
229 error_code = error_attr->get_error_code(error_attr);
230 msg_info = error_attr->get_msg_info(error_attr);
231
232 DBG1(DBG_IMC, "received TCG-PTS error '%N'",
233 pts_error_code_names, error_code);
234 DBG1(DBG_IMC, "error information: %B", &msg_info);
235
236 result = TNC_RESULT_FATAL;
237 }
238 }
239 else if (attr->get_vendor_id(attr) == PEN_TCG)
240 {
241 if (!imc_attestation_process(attr, attr_list, attestation_state,
242 supported_algorithms, supported_dh_groups))
243 {
244 result = TNC_RESULT_FATAL;
245 break;
246 }
247 }
248 }
249 enumerator->destroy(enumerator);
250 pa_tnc_msg->destroy(pa_tnc_msg);
251
252 if (result == TNC_RESULT_SUCCESS && attr_list->get_count(attr_list))
253 {
254 result = imc_attestation->send_message(imc_attestation, connection_id,
255 FALSE, 0, TNC_IMVID_ANY, attr_list);
256 }
257 attr_list->destroy(attr_list);
258
259 return result;
260 }
261
262 /**
263 * see section 3.8.4 of TCG TNC IF-IMC Specification 1.3
264 */
265 TNC_Result TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
266 TNC_ConnectionID connection_id,
267 TNC_BufferReference msg,
268 TNC_UInt32 msg_len,
269 TNC_MessageType msg_type)
270 {
271 TNC_VendorID msg_vid;
272 TNC_MessageSubtype msg_subtype;
273
274 msg_vid = msg_type >> 8;
275 msg_subtype = msg_type & TNC_SUBTYPE_ANY;
276
277 return receive_message(imc_id, connection_id, 0, chunk_create(msg, msg_len),
278 msg_vid, msg_subtype, 0, TNC_IMCID_ANY);
279 }
280
281 /**
282 * see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
283 */
284 TNC_Result TNC_IMC_ReceiveMessageLong(TNC_IMCID imc_id,
285 TNC_ConnectionID connection_id,
286 TNC_UInt32 msg_flags,
287 TNC_BufferReference msg,
288 TNC_UInt32 msg_len,
289 TNC_VendorID msg_vid,
290 TNC_MessageSubtype msg_subtype,
291 TNC_UInt32 src_imv_id,
292 TNC_UInt32 dst_imc_id)
293 {
294 return receive_message(imc_id, connection_id, msg_flags,
295 chunk_create(msg, msg_len), msg_vid, msg_subtype,
296 src_imv_id, dst_imc_id);
297 }
298
299 /**
300 * see section 3.8.7 of TCG TNC IF-IMC Specification 1.3
301 */
302 TNC_Result TNC_IMC_BatchEnding(TNC_IMCID imc_id,
303 TNC_ConnectionID connection_id)
304 {
305 if (!imc_attestation)
306 {
307 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
308 return TNC_RESULT_NOT_INITIALIZED;
309 }
310 return TNC_RESULT_SUCCESS;
311 }
312
313 /**
314 * see section 3.8.8 of TCG TNC IF-IMC Specification 1.3
315 */
316 TNC_Result TNC_IMC_Terminate(TNC_IMCID imc_id)
317 {
318 if (!imc_attestation)
319 {
320 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
321 return TNC_RESULT_NOT_INITIALIZED;
322 }
323
324 libpts_deinit();
325
326 imc_attestation->destroy(imc_attestation);
327 imc_attestation = NULL;
328
329 return TNC_RESULT_SUCCESS;
330 }
331
332 /**
333 * see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3
334 */
335 TNC_Result TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
336 TNC_TNCC_BindFunctionPointer bind_function)
337 {
338 if (!imc_attestation)
339 {
340 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
341 return TNC_RESULT_NOT_INITIALIZED;
342 }
343 return imc_attestation->bind_functions(imc_attestation, bind_function);
344 }