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1.1 misho 1: /*
2: * Copyright (C) 2011-2012 Sansar Choinyambuu
3: * Copyright (C) 2011-2014 Andreas Steffen
4: * HSR Hochschule fuer Technik Rapperswil
5: *
6: * This program is free software; you can redistribute it and/or modify it
7: * under the terms of the GNU General Public License as published by the
8: * Free Software Foundation; either version 2 of the License, or (at your
9: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * for more details.
15: */
16:
17: #include "imc_attestation_state.h"
18: #include "imc_attestation_process.h"
19:
20: #include <imc/imc_agent.h>
21: #include <imc/imc_msg.h>
22: #include <ietf/ietf_attr.h>
23: #include <ietf/ietf_attr_pa_tnc_error.h>
24: #include <ietf/ietf_attr_product_info.h>
25: #include <ietf/ietf_attr_string_version.h>
26: #include <ietf/ietf_attr_assess_result.h>
27: #include <tcg/pts/tcg_pts_attr_proto_caps.h>
28: #include <tcg/pts/tcg_pts_attr_meas_algo.h>
29: #include <os_info/os_info.h>
30: #include <pts/pts_error.h>
31:
32: #include <tncif_pa_subtypes.h>
33:
34: #include <pen/pen.h>
35: #include <utils/debug.h>
36: #include <collections/linked_list.h>
37:
38: /* IMC definitions */
39:
40: static const char imc_name[] = "Attestation";
41:
42: static pen_type_t msg_types[] = {
43: { PEN_TCG, PA_SUBTYPE_TCG_PTS }
44: };
45:
46: static imc_agent_t *imc_attestation;
47:
48: /**
49: * Supported PTS measurement algorithms
50: */
51: static pts_meas_algorithms_t supported_algorithms = PTS_MEAS_ALGO_NONE;
52:
53: /**
54: * Supported PTS Diffie Hellman Groups
55: */
56: static pts_dh_group_t supported_dh_groups = PTS_DH_GROUP_NONE;
57:
58: /**
59: * see section 3.8.1 of TCG TNC IF-IMC Specification 1.3
60: */
61: TNC_Result TNC_IMC_API TNC_IMC_Initialize(TNC_IMCID imc_id,
62: TNC_Version min_version,
63: TNC_Version max_version,
64: TNC_Version *actual_version)
65: {
66: bool mandatory_dh_groups;
67:
68: if (imc_attestation)
69: {
70: DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
71: return TNC_RESULT_ALREADY_INITIALIZED;
72: }
73: imc_attestation = imc_agent_create(imc_name, msg_types, countof(msg_types),
74: imc_id, actual_version);
75: if (!imc_attestation)
76: {
77: return TNC_RESULT_FATAL;
78: }
79:
80: mandatory_dh_groups = lib->settings->get_bool(lib->settings,
81: "%s.plugins.imc-attestation.mandatory_dh_groups", TRUE, lib->ns);
82:
83: if (!pts_meas_algo_probe(&supported_algorithms) ||
84: !pts_dh_group_probe(&supported_dh_groups, mandatory_dh_groups))
85: {
86: imc_attestation->destroy(imc_attestation);
87: imc_attestation = NULL;
88: return TNC_RESULT_FATAL;
89: }
90:
91: if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1)
92: {
93: DBG1(DBG_IMC, "no common IF-IMC version");
94: return TNC_RESULT_NO_COMMON_VERSION;
95: }
96: return TNC_RESULT_SUCCESS;
97: }
98:
99: /**
100: * see section 3.8.2 of TCG TNC IF-IMC Specification 1.3
101: */
102: TNC_Result TNC_IMC_API TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id,
103: TNC_ConnectionID connection_id,
104: TNC_ConnectionState new_state)
105: {
106: imc_state_t *state;
107:
108: if (!imc_attestation)
109: {
110: DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
111: return TNC_RESULT_NOT_INITIALIZED;
112: }
113: switch (new_state)
114: {
115: case TNC_CONNECTION_STATE_CREATE:
116: state = imc_attestation_state_create(connection_id);
117: return imc_attestation->create_state(imc_attestation, state);
118: case TNC_CONNECTION_STATE_DELETE:
119: return imc_attestation->delete_state(imc_attestation, connection_id);
120: default:
121: return imc_attestation->change_state(imc_attestation, connection_id,
122: new_state, NULL);
123: }
124: }
125:
126:
127: /**
128: * see section 3.8.3 of TCG TNC IF-IMC Specification 1.3
129: */
130: TNC_Result TNC_IMC_API TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
131: TNC_ConnectionID connection_id)
132: {
133: if (!imc_attestation)
134: {
135: DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
136: return TNC_RESULT_NOT_INITIALIZED;
137: }
138:
139: return TNC_RESULT_SUCCESS;
140: }
141:
142: static TNC_Result receive_message(imc_state_t *state, imc_msg_t *in_msg)
143: {
144: imc_msg_t *out_msg;
145: imc_attestation_state_t *attestation_state;
146: enumerator_t *enumerator;
147: pa_tnc_attr_t *attr;
148: pen_type_t type;
149: TNC_Result result;
150: bool fatal_error = FALSE;
151:
152: /* generate an outgoing PA-TNC message - we might need it */
153: out_msg = imc_msg_create_as_reply(in_msg);
154:
155: /* parse received PA-TNC message and handle local and remote errors */
156: result = in_msg->receive(in_msg, out_msg, &fatal_error);
157: if (result != TNC_RESULT_SUCCESS)
158: {
159: out_msg->destroy(out_msg);
160: return result;
161: }
162:
163: /* analyze PA-TNC attributes */
164: enumerator = in_msg->create_attribute_enumerator(in_msg);
165: while (enumerator->enumerate(enumerator, &attr))
166: {
167: type = attr->get_type(attr);
168:
169: if (type.vendor_id == PEN_IETF)
170: {
171: if (type.type == IETF_ATTR_PA_TNC_ERROR)
172: {
173: ietf_attr_pa_tnc_error_t *error_attr;
174: pen_type_t error_code;
175: chunk_t msg_info;
176:
177: error_attr = (ietf_attr_pa_tnc_error_t*)attr;
178: error_code = error_attr->get_error_code(error_attr);
179:
180: if (error_code.vendor_id == PEN_TCG)
181: {
182: msg_info = error_attr->get_msg_info(error_attr);
183:
184: DBG1(DBG_IMC, "received TCG-PTS error '%N'",
185: pts_error_code_names, error_code.type);
186: DBG1(DBG_IMC, "error information: %B", &msg_info);
187:
188: result = TNC_RESULT_FATAL;
189: }
190: }
191: }
192: else if (type.vendor_id == PEN_TCG)
193: {
194: attestation_state = (imc_attestation_state_t*)state;
195:
196: if (!imc_attestation_process(attr, out_msg, attestation_state,
197: supported_algorithms, supported_dh_groups))
198: {
199: result = TNC_RESULT_FATAL;
200: break;
201: }
202: }
203: }
204: enumerator->destroy(enumerator);
205:
206: if (result == TNC_RESULT_SUCCESS)
207: {
208: /* send PA-TNC message with the EXCL flag set */
209: result = out_msg->send(out_msg, TRUE);
210: }
211: out_msg->destroy(out_msg);
212:
213: return result;
214: }
215:
216: /**
217: * see section 3.8.4 of TCG TNC IF-IMC Specification 1.3
218: */
219: TNC_Result TNC_IMC_API TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
220: TNC_ConnectionID connection_id,
221: TNC_BufferReference msg,
222: TNC_UInt32 msg_len,
223: TNC_MessageType msg_type)
224: {
225: imc_state_t *state;
226: imc_msg_t *in_msg;
227: TNC_Result result;
228:
229: if (!imc_attestation)
230: {
231: DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
232: return TNC_RESULT_NOT_INITIALIZED;
233: }
234: if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
235: {
236: return TNC_RESULT_FATAL;
237: }
238:
239: in_msg = imc_msg_create_from_data(imc_attestation, state, connection_id,
240: msg_type, chunk_create(msg, msg_len));
241: result = receive_message(state, in_msg);
242: in_msg->destroy(in_msg);
243:
244: return result;
245: }
246:
247: /**
248: * see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
249: */
250: TNC_Result TNC_IMC_API TNC_IMC_ReceiveMessageLong(TNC_IMCID imc_id,
251: TNC_ConnectionID connection_id,
252: TNC_UInt32 msg_flags,
253: TNC_BufferReference msg,
254: TNC_UInt32 msg_len,
255: TNC_VendorID msg_vid,
256: TNC_MessageSubtype msg_subtype,
257: TNC_UInt32 src_imv_id,
258: TNC_UInt32 dst_imc_id)
259: {
260: imc_state_t *state;
261: imc_msg_t *in_msg;
262: TNC_Result result;
263:
264: if (!imc_attestation)
265: {
266: DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
267: return TNC_RESULT_NOT_INITIALIZED;
268: }
269: if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
270: {
271: return TNC_RESULT_FATAL;
272: }
273: in_msg = imc_msg_create_from_long_data(imc_attestation, state, connection_id,
274: src_imv_id, dst_imc_id, msg_vid, msg_subtype,
275: chunk_create(msg, msg_len));
276: result =receive_message(state, in_msg);
277: in_msg->destroy(in_msg);
278:
279: return result;
280: }
281:
282: /**
283: * see section 3.8.7 of TCG TNC IF-IMC Specification 1.3
284: */
285: TNC_Result TNC_IMC_API TNC_IMC_BatchEnding(TNC_IMCID imc_id,
286: TNC_ConnectionID connection_id)
287: {
288: if (!imc_attestation)
289: {
290: DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
291: return TNC_RESULT_NOT_INITIALIZED;
292: }
293: return TNC_RESULT_SUCCESS;
294: }
295:
296: /**
297: * see section 3.8.8 of TCG TNC IF-IMC Specification 1.3
298: */
299: TNC_Result TNC_IMC_API TNC_IMC_Terminate(TNC_IMCID imc_id)
300: {
301: if (!imc_attestation)
302: {
303: DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
304: return TNC_RESULT_NOT_INITIALIZED;
305: }
306: imc_attestation->destroy(imc_attestation);
307: imc_attestation = NULL;
308:
309: return TNC_RESULT_SUCCESS;
310: }
311:
312: /**
313: * see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3
314: */
315: TNC_Result TNC_IMC_API TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
316: TNC_TNCC_BindFunctionPointer bind_function)
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: return imc_attestation->bind_functions(imc_attestation, bind_function);
324: }