743ba3c35536b12220452d1c54b99585e279d725
[strongswan.git] / src / libimcv / 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
18 #include <imc/imc_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 /* IMC definitions */
30
31 static const char imc_name[] = "Attestation";
32
33 #define IMC_VENDOR_ID PEN_TCG
34 #define IMC_SUBTYPE PA_SUBTYPE_TCG_PTS
35
36 static imc_agent_t *imc_attestation;
37
38 /**
39 * see section 3.7.1 of TCG TNC IF-IMC Specification 1.2
40 */
41 TNC_Result TNC_IMC_Initialize(TNC_IMCID imc_id,
42 TNC_Version min_version,
43 TNC_Version max_version,
44 TNC_Version *actual_version)
45 {
46 if (imc_attestation)
47 {
48 DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
49 return TNC_RESULT_ALREADY_INITIALIZED;
50 }
51 imc_attestation = imc_agent_create(imc_name, IMC_VENDOR_ID, IMC_SUBTYPE,
52 imc_id, actual_version);
53 if (!imc_attestation)
54 {
55 return TNC_RESULT_FATAL;
56 }
57 if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1)
58 {
59 DBG1(DBG_IMC, "no common IF-IMC 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-IMC Specification 1.2
67 */
68 TNC_Result TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id,
69 TNC_ConnectionID connection_id,
70 TNC_ConnectionState new_state)
71 {
72 imc_state_t *state;
73 imc_attestation_state_t *test_state;
74
75 if (!imc_attestation)
76 {
77 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
78 return TNC_RESULT_NOT_INITIALIZED;
79 }
80 switch (new_state)
81 {
82 case TNC_CONNECTION_STATE_CREATE:
83 state = imc_attestation_state_create(connection_id);
84 return imc_attestation->create_state(imc_attestation, state);
85 case TNC_CONNECTION_STATE_DELETE:
86 return imc_attestation->delete_state(imc_attestation, connection_id);
87 case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
88 case TNC_CONNECTION_STATE_ACCESS_NONE:
89 default:
90 return imc_attestation->change_state(imc_attestation, connection_id,
91 new_state, NULL);
92 }
93 }
94
95 static TNC_Result send_message(TNC_ConnectionID connection_id)
96 {
97 pa_tnc_msg_t *msg;
98 pa_tnc_attr_t *attr;
99 imc_state_t *state;
100 imc_attestation_state_t *test_state;
101 TNC_Result result;
102
103 if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
104 {
105 return TNC_RESULT_FATAL;
106 }
107 test_state = (imc_attestation_state_t*)state;
108 msg = pa_tnc_msg_create();
109 /**
110 * add TCG PTS attributes
111 */
112 msg->build(msg);
113 result = imc_attestation->send_message(imc_attestation, connection_id,
114 msg->get_encoding(msg));
115 msg->destroy(msg);
116
117 return result;
118 }
119
120 /**
121 * see section 3.7.3 of TCG TNC IF-IMC Specification 1.2
122 */
123 TNC_Result TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
124 TNC_ConnectionID connection_id)
125 {
126 if (!imc_attestation)
127 {
128 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
129 return TNC_RESULT_NOT_INITIALIZED;
130 }
131 return send_message(connection_id);
132 }
133
134 /**
135 * see section 3.7.4 of TCG TNC IF-IMC Specification 1.2
136 */
137 TNC_Result TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
138 TNC_ConnectionID connection_id,
139 TNC_BufferReference msg,
140 TNC_UInt32 msg_len,
141 TNC_MessageType msg_type)
142 {
143 pa_tnc_msg_t *pa_tnc_msg;
144 pa_tnc_attr_t *attr;
145 enumerator_t *enumerator;
146 TNC_Result result;
147 bool fatal_error = FALSE;
148
149 if (!imc_attestation)
150 {
151 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
152 return TNC_RESULT_NOT_INITIALIZED;
153 }
154
155 /* parse received PA-TNC message and automatically handle any errors */
156 result = imc_attestation->receive_message(imc_attestation, connection_id,
157 chunk_create(msg, msg_len), msg_type,
158 &pa_tnc_msg);
159
160 /* no parsed PA-TNC attributes available if an error occurred */
161 if (!pa_tnc_msg)
162 {
163 return result;
164 }
165
166 /* analyze PA-TNC attributes */
167 enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
168 while (enumerator->enumerate(enumerator, &attr))
169 {
170 if (attr->get_vendor_id(attr) == PEN_IETF &&
171 attr->get_type(attr) == IETF_ATTR_PA_TNC_ERROR)
172 {
173 ietf_attr_pa_tnc_error_t *error_attr;
174 pa_tnc_error_code_t error_code;
175 chunk_t msg_info, attr_info;
176
177 error_attr = (ietf_attr_pa_tnc_error_t*)attr;
178 error_code = error_attr->get_error_code(error_attr);
179 msg_info = error_attr->get_msg_info(error_attr);
180
181 DBG1(DBG_IMC, "received PA-TNC error '%N' concerning message %#B",
182 pa_tnc_error_code_names, error_code, &msg_info);
183 switch (error_code)
184 {
185 case PA_ERROR_ATTR_TYPE_NOT_SUPPORTED:
186 attr_info = error_attr->get_attr_info(error_attr);
187 DBG1(DBG_IMC, " unsupported attribute %#B", &attr_info);
188 break;
189 default:
190 break;
191 }
192 fatal_error = TRUE;
193 }
194 else if (attr->get_vendor_id(attr) == PEN_TCG)
195 {
196 /**
197 * Handle TCG PTS attributes
198 */
199 }
200 }
201 enumerator->destroy(enumerator);
202 pa_tnc_msg->destroy(pa_tnc_msg);
203
204 /* if no error occurred then always return the same response */
205 return fatal_error ? TNC_RESULT_FATAL : send_message(connection_id);
206 }
207
208 /**
209 * see section 3.7.5 of TCG TNC IF-IMC Specification 1.2
210 */
211 TNC_Result TNC_IMC_BatchEnding(TNC_IMCID imc_id,
212 TNC_ConnectionID connection_id)
213 {
214 if (!imc_attestation)
215 {
216 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
217 return TNC_RESULT_NOT_INITIALIZED;
218 }
219 return TNC_RESULT_SUCCESS;
220 }
221
222 /**
223 * see section 3.7.6 of TCG TNC IF-IMC Specification 1.2
224 */
225 TNC_Result TNC_IMC_Terminate(TNC_IMCID imc_id)
226 {
227 if (!imc_attestation)
228 {
229 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
230 return TNC_RESULT_NOT_INITIALIZED;
231 }
232 imc_attestation->destroy(imc_attestation);
233 imc_attestation = NULL;
234
235 return TNC_RESULT_SUCCESS;
236 }
237
238 /**
239 * see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.2
240 */
241 TNC_Result TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
242 TNC_TNCC_BindFunctionPointer bind_function)
243 {
244 if (!imc_attestation)
245 {
246 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
247 return TNC_RESULT_NOT_INITIALIZED;
248 }
249 return imc_attestation->bind_functions(imc_attestation, bind_function);
250 }