428825c928096518008b4a53c083265cb73835fa
[strongswan.git] / src / libimcv / plugins / imv_attestation / imv_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 "imv_attestation_state.h"
17
18 #include <imv/imv_agent.h>
19 #include <pa_tnc/pa_tnc_msg.h>
20 #include <ietf/ietf_attr.h>
21 #include <ietf/ietf_attr_pa_tnc_error.h>
22 #include <tcg/tcg_attr.h>
23
24 #include <tncif_pa_subtypes.h>
25
26 #include <pen/pen.h>
27 #include <debug.h>
28
29 /* IMV definitions */
30
31 static const char imv_name[] = "Attestation";
32
33 #define IMV_VENDOR_ID PEN_TCG
34 #define IMV_SUBTYPE PA_SUBTYPES_TCG_PTS
35
36 static imv_agent_t *imv_attestation;
37
38 /**
39 * see section 3.7.1 of TCG TNC IF-IMV Specification 1.2
40 */
41 TNC_Result TNC_IMV_Initialize(TNC_IMVID imv_id,
42 TNC_Version min_version,
43 TNC_Version max_version,
44 TNC_Version *actual_version)
45 {
46 if (imv_attestation)
47 {
48 DBG1(DBG_IMV, "IMV \"%s\" has already been initialized", imv_name);
49 return TNC_RESULT_ALREADY_INITIALIZED;
50 }
51 imv_attestation = imv_agent_create(imv_name, IMV_VENDOR_ID, IMV_SUBTYPE,
52 imv_id, actual_version);
53 if (!imv_attestation)
54 {
55 return TNC_RESULT_FATAL;
56 }
57 if (min_version > TNC_IFIMV_VERSION_1 || max_version < TNC_IFIMV_VERSION_1)
58 {
59 DBG1(DBG_IMV, "no common IF-IMV version");
60 return TNC_RESULT_NO_COMMON_VERSION;
61 }
62 return TNC_RESULT_SUCCESS;
63 }
64
65 /**
66 * see section 3.7.2 of TCG TNC IF-IMV Specification 1.2
67 */
68 TNC_Result TNC_IMV_NotifyConnectionChange(TNC_IMVID imv_id,
69 TNC_ConnectionID connection_id,
70 TNC_ConnectionState new_state)
71 {
72 imv_state_t *state;
73 imv_attestation_state_t *attestation_state;
74
75 if (!imv_attestation)
76 {
77 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
78 return TNC_RESULT_NOT_INITIALIZED;
79 }
80 switch (new_state)
81 {
82 case TNC_CONNECTION_STATE_CREATE:
83 state = imv_attestation_state_create(connection_id);
84 return imv_attestation->create_state(imv_attestation, state);
85 case TNC_CONNECTION_STATE_DELETE:
86 return imv_attestation->delete_state(imv_attestation, connection_id);
87 case TNC_CONNECTION_STATE_HANDSHAKE:
88 if (!imv_attestation->get_state(imv_attestation, connection_id, &state))
89 {
90 return TNC_RESULT_FATAL;
91 }
92 state->change_state(state, new_state);
93 attestation_state = (imv_attestation_state_t*)state;
94 /**
95 * do any attestation specific configuration here
96 */
97 return TNC_RESULT_SUCCESS;
98 default:
99 return imv_attestation->change_state(imv_attestation, connection_id, new_state);
100 }
101 }
102
103 static TNC_Result send_message(TNC_ConnectionID connection_id)
104 {
105 pa_tnc_msg_t *msg;
106 pa_tnc_attr_t *attr;
107 TNC_Result result;
108
109 msg = pa_tnc_msg_create();
110 /**
111 * add TCG PTS attributes
112 */
113 msg->build(msg);
114 result = imv_attestation->send_message(imv_attestation, connection_id,
115 msg->get_encoding(msg));
116 msg->destroy(msg);
117
118 return result;
119 }
120
121 /**
122 * see section 3.7.3 of TCG TNC IF-IMV Specification 1.2
123 */
124 TNC_Result TNC_IMV_ReceiveMessage(TNC_IMVID imv_id,
125 TNC_ConnectionID connection_id,
126 TNC_BufferReference msg,
127 TNC_UInt32 msg_len,
128 TNC_MessageType msg_type)
129 {
130 pa_tnc_msg_t *pa_tnc_msg;
131 pa_tnc_attr_t *attr;
132 imv_state_t *state;
133 imv_attestation_state_t *imv_attestation_state;
134 enumerator_t *enumerator;
135 TNC_Result result;
136 bool fatal_error = FALSE;
137
138 if (!imv_attestation)
139 {
140 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
141 return TNC_RESULT_NOT_INITIALIZED;
142 }
143
144 /* get current IMV state */
145 if (!imv_attestation->get_state(imv_attestation, connection_id, &state))
146 {
147 return TNC_RESULT_FATAL;
148 }
149
150 /* parse received PA-TNC message and automatically handle any errors */
151 result = imv_attestation->receive_message(imv_attestation, connection_id,
152 chunk_create(msg, msg_len), msg_type,
153 &pa_tnc_msg);
154
155 /* no parsed PA-TNC attributes available if an error occurred */
156 if (!pa_tnc_msg)
157 {
158 return result;
159 }
160
161 /* analyze PA-TNC attributes */
162 enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
163 while (enumerator->enumerate(enumerator, &attr))
164 {
165 if (attr->get_vendor_id(attr) == PEN_IETF &&
166 attr->get_type(attr) == IETF_ATTR_PA_TNC_ERROR)
167 {
168 ietf_attr_pa_tnc_error_t *error_attr;
169 pa_tnc_error_code_t error_code;
170 chunk_t msg_info, attr_info;
171
172 error_attr = (ietf_attr_pa_tnc_error_t*)attr;
173 error_code = error_attr->get_error_code(error_attr);
174 msg_info = error_attr->get_msg_info(error_attr);
175
176 DBG1(DBG_IMV, "received PA-TNC error '%N' concerning message %#B",
177 pa_tnc_error_code_names, error_code, &msg_info);
178 switch (error_code)
179 {
180 case PA_ERROR_ATTR_TYPE_NOT_SUPPORTED:
181 attr_info = error_attr->get_attr_info(error_attr);
182 DBG1(DBG_IMV, " unsupported attribute %#B", &attr_info);
183 break;
184 default:
185 break;
186 }
187 fatal_error = TRUE;
188 }
189 else if (attr->get_vendor_id(attr) == PEN_TCG)
190 {
191 /**
192 * Handle TCG PTS attributes
193 */
194 }
195 }
196 enumerator->destroy(enumerator);
197 pa_tnc_msg->destroy(pa_tnc_msg);
198
199 if (fatal_error)
200 {
201 state->set_recommendation(state,
202 TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
203 TNC_IMV_EVALUATION_RESULT_ERROR);
204 return imv_attestation->provide_recommendation(imv_attestation, connection_id);
205 }
206
207 return imv_attestation->provide_recommendation(imv_attestation, connection_id);
208 }
209
210 /**
211 * see section 3.7.4 of TCG TNC IF-IMV Specification 1.2
212 */
213 TNC_Result TNC_IMV_SolicitRecommendation(TNC_IMVID imv_id,
214 TNC_ConnectionID connection_id)
215 {
216 if (!imv_attestation)
217 {
218 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
219 return TNC_RESULT_NOT_INITIALIZED;
220 }
221 return imv_attestation->provide_recommendation(imv_attestation, connection_id);
222 }
223
224 /**
225 * see section 3.7.5 of TCG TNC IF-IMV Specification 1.2
226 */
227 TNC_Result TNC_IMV_BatchEnding(TNC_IMVID imv_id,
228 TNC_ConnectionID connection_id)
229 {
230 if (!imv_attestation)
231 {
232 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
233 return TNC_RESULT_NOT_INITIALIZED;
234 }
235 return TNC_RESULT_SUCCESS;
236 }
237
238 /**
239 * see section 3.7.6 of TCG TNC IF-IMV Specification 1.2
240 */
241 TNC_Result TNC_IMV_Terminate(TNC_IMVID imv_id)
242 {
243 if (!imv_attestation)
244 {
245 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
246 return TNC_RESULT_NOT_INITIALIZED;
247 }
248 imv_attestation->destroy(imv_attestation);
249 imv_attestation = NULL;
250
251 return TNC_RESULT_SUCCESS;
252 }
253
254 /**
255 * see section 4.2.8.1 of TCG TNC IF-IMV Specification 1.2
256 */
257 TNC_Result TNC_IMV_ProvideBindFunction(TNC_IMVID imv_id,
258 TNC_TNCS_BindFunctionPointer bind_function)
259 {
260 if (!imv_attestation)
261 {
262 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
263 return TNC_RESULT_NOT_INITIALIZED;
264 }
265 return imv_attestation->bind_functions(imv_attestation, bind_function);
266 }