Defined functional components within ITA namespace
[strongswan.git] / src / libimcv / plugins / imv_attestation / imv_attestation_process.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_process.h"
17
18 #include <ietf/ietf_attr_pa_tnc_error.h>
19
20 #include <pts/pts.h>
21
22 #include <tcg/tcg_pts_attr_aik.h>
23 #include <tcg/tcg_pts_attr_dh_nonce_params_resp.h>
24 #include <tcg/tcg_pts_attr_file_meas.h>
25 #include <tcg/tcg_pts_attr_meas_algo.h>
26 #include <tcg/tcg_pts_attr_proto_caps.h>
27 #include <tcg/tcg_pts_attr_simple_comp_evid.h>
28 #include <tcg/tcg_pts_attr_simple_evid_final.h>
29 #include <tcg/tcg_pts_attr_tpm_version_info.h>
30 #include <tcg/tcg_pts_attr_unix_file_meta.h>
31
32 #include <debug.h>
33 #include <crypto/hashers/hasher.h>
34
35 #include <inttypes.h>
36
37 bool imv_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
38 imv_attestation_state_t *attestation_state,
39 pts_meas_algorithms_t supported_algorithms,
40 pts_dh_group_t supported_dh_groups,
41 pts_database_t *pts_db,
42 credential_manager_t *pts_credmgr)
43 {
44 chunk_t attr_info;
45 pts_t *pts;
46
47 pts = attestation_state->get_pts(attestation_state);
48
49 switch (attr->get_type(attr))
50 {
51 case TCG_PTS_PROTO_CAPS:
52 {
53 tcg_pts_attr_proto_caps_t *attr_cast;
54 pts_proto_caps_flag_t flags;
55
56 attr_cast = (tcg_pts_attr_proto_caps_t*)attr;
57 flags = attr_cast->get_flags(attr_cast);
58 pts->set_proto_caps(pts, flags);
59 break;
60 }
61 case TCG_PTS_MEAS_ALGO_SELECTION:
62 {
63 tcg_pts_attr_meas_algo_t *attr_cast;
64 pts_meas_algorithms_t selected_algorithm;
65
66 attr_cast = (tcg_pts_attr_meas_algo_t*)attr;
67 selected_algorithm = attr_cast->get_algorithms(attr_cast);
68 if (!(selected_algorithm & supported_algorithms))
69 {
70 DBG1(DBG_IMV, "PTS-IMC selected unsupported"
71 " measurement algorithm");
72 return FALSE;
73 }
74 pts->set_meas_algorithm(pts, selected_algorithm);
75 break;
76 }
77 case TCG_PTS_DH_NONCE_PARAMS_RESP:
78 {
79 tcg_pts_attr_dh_nonce_params_resp_t *attr_cast;
80 int nonce_len, min_nonce_len;
81 pts_dh_group_t dh_group;
82 pts_meas_algorithms_t offered_algorithms, selected_algorithm;
83 chunk_t responder_value, responder_nonce;
84
85 attr_cast = (tcg_pts_attr_dh_nonce_params_resp_t*)attr;
86 responder_nonce = attr_cast->get_responder_nonce(attr_cast);
87
88 /* check compliance of responder nonce length */
89 min_nonce_len = lib->settings->get_int(lib->settings,
90 "libimcv.plugins.imv-attestation.min_nonce_len", 0);
91 nonce_len = responder_nonce.len;
92 if (nonce_len < PTS_MIN_NONCE_LEN ||
93 (min_nonce_len > 0 && nonce_len < min_nonce_len))
94 {
95 attr = pts_dh_nonce_error_create(
96 max(PTS_MIN_NONCE_LEN, min_nonce_len),
97 PTS_MAX_NONCE_LEN);
98 attr_list->insert_last(attr_list, attr);
99 break;
100 }
101
102 dh_group = attr_cast->get_dh_group(attr_cast);
103 if (!(dh_group & supported_dh_groups))
104 {
105 DBG1(DBG_IMV, "PTS-IMC selected unsupported DH group");
106 return FALSE;
107 }
108
109 offered_algorithms = attr_cast->get_hash_algo_set(attr_cast);
110 selected_algorithm = pts_meas_algo_select(supported_algorithms,
111 offered_algorithms);
112 if (selected_algorithm == PTS_MEAS_ALGO_NONE)
113 {
114 attr = pts_hash_alg_error_create(supported_algorithms);
115 attr_list->insert_last(attr_list, attr);
116 break;
117 }
118 pts->set_dh_hash_algorithm(pts, selected_algorithm);
119
120 if (!pts->create_dh_nonce(pts, dh_group, nonce_len))
121 {
122 return FALSE;
123 }
124
125 responder_value = attr_cast->get_responder_value(attr_cast);
126 pts->set_peer_public_value(pts, responder_value,
127 responder_nonce);
128
129 /* Calculate secret assessment value */
130 if (!pts->calculate_secret(pts))
131 {
132 return FALSE;
133 }
134 break;
135 }
136 case TCG_PTS_TPM_VERSION_INFO:
137 {
138 tcg_pts_attr_tpm_version_info_t *attr_cast;
139 chunk_t tpm_version_info;
140
141 attr_cast = (tcg_pts_attr_tpm_version_info_t*)attr;
142 tpm_version_info = attr_cast->get_tpm_version_info(attr_cast);
143 pts->set_tpm_version_info(pts, tpm_version_info);
144 break;
145 }
146 case TCG_PTS_AIK:
147 {
148 tcg_pts_attr_aik_t *attr_cast;
149 certificate_t *aik, *issuer;
150 enumerator_t *e;
151 bool trusted = FALSE;
152
153 attr_cast = (tcg_pts_attr_aik_t*)attr;
154 aik = attr_cast->get_aik(attr_cast);
155 if (!aik)
156 {
157 DBG1(DBG_IMV, "AIK unavailable");
158 return FALSE;
159 }
160 if (aik->get_type(aik) == CERT_X509)
161 {
162 DBG1(DBG_IMV, "verifying AIK certificate");
163 e = pts_credmgr->create_trusted_enumerator(pts_credmgr,
164 KEY_ANY, aik->get_issuer(aik), FALSE);
165 while (e->enumerate(e, &issuer))
166 {
167 if (aik->issued_by(aik, issuer))
168 {
169 trusted = TRUE;
170 break;
171 }
172 }
173 e->destroy(e);
174 DBG1(DBG_IMV, "AIK certificate is %strusted",
175 trusted ? "" : "not ");
176 }
177 pts->set_aik(pts, aik);
178 break;
179 }
180 case TCG_PTS_SIMPLE_COMP_EVID:
181 {
182 tcg_pts_attr_simple_comp_evid_t *attr_cast;
183 bool pcr_info_inclided;
184 pts_attr_simple_comp_evid_flag_t flags;
185 u_int32_t depth, comp_vendor_id, extended_pcr;
186 u_int8_t family, measurement_type;
187 pts_qualifier_t qualifier;
188 pts_ita_funct_comp_name_t name;
189 pts_meas_algorithms_t hash_algorithm;
190 pts_pcr_transform_t transformation;
191 chunk_t measurement_time, policy_uri;
192 chunk_t pcr_before, pcr_after, measurement;
193
194 attr_cast = (tcg_pts_attr_simple_comp_evid_t*)attr;
195 attr_info = attr->get_value(attr);
196
197 pcr_info_inclided = attr_cast->is_pcr_info_included(attr_cast);
198 flags = attr_cast->get_flags(attr_cast);
199 depth = attr_cast->get_sub_component_depth(attr_cast);
200 if (depth != 0)
201 {
202 DBG1(DBG_IMV, "Current version of Attestation IMV does not"
203 " support sub component measurement deeper than zero");
204 }
205 comp_vendor_id = attr_cast->get_spec_comp_funct_name_vendor_id(
206 attr_cast);
207 if (comp_vendor_id != PEN_ITA)
208 {
209 DBG1(DBG_IMV, "Current version of Attestation IMV supports"
210 "only functional component namings by ITA ");
211 break;
212 }
213 family = attr_cast->get_family(attr_cast);
214 if (family)
215 {
216 attr = ietf_attr_pa_tnc_error_create(PEN_TCG,
217 TCG_PTS_INVALID_NAME_FAM, attr_info);
218 attr_list->insert_last(attr_list, attr);
219 break;
220 }
221 qualifier = attr_cast->get_qualifier(attr_cast);
222
223 /* Check if Unknown or Wildcard was set for qualifier */
224 if (qualifier.kernel && qualifier.sub_component &&
225 (qualifier.type & PTS_ITA_FUNC_COMP_TYPE_ALL))
226 {
227 DBG1(DBG_IMV, "Wildcard was set for the qualifier "
228 "of functional component");
229 return FALSE;
230 }
231 else if (!qualifier.kernel && !qualifier.sub_component &&
232 (qualifier.type & PTS_ITA_FUNC_COMP_TYPE_UNKNOWN))
233 {
234 DBG1(DBG_IMV, "Unknown feature was set for the qualifier "
235 "of functional component");
236 return FALSE;
237 }
238
239 name = attr_cast->get_comp_funct_name(attr_cast);
240 measurement_type = attr_cast->get_measurement_type(attr_cast);
241 hash_algorithm = attr_cast->get_hash_algorithm(attr_cast);
242 transformation = attr_cast->get_pcr_trans(attr_cast);
243 measurement_time = attr_cast->get_measurement_time(attr_cast);
244
245 /* Call getters of optional fields when corresponding flag is set */
246 if (pcr_info_inclided)
247 {
248 pcr_entry_t *entry;
249
250 extended_pcr = attr_cast->get_extended_pcr(attr_cast);
251 pcr_before = attr_cast->get_pcr_before_value(attr_cast);
252 pcr_after = attr_cast->get_pcr_after_value(attr_cast);
253 measurement = attr_cast->get_comp_measurement(attr_cast);
254
255 DBG3(DBG_IMV,"PCR: %d was extended with %B",
256 extended_pcr, &measurement);
257 DBG3(DBG_IMV,"PCR: %d before value: %B",
258 extended_pcr, &pcr_before);
259 DBG3(DBG_IMV,"PCR: %d after value: %B",
260 extended_pcr, &pcr_after);
261
262 entry = malloc_thing(pcr_entry_t);
263 entry->pcr_number = extended_pcr;
264 memcpy(entry->pcr_value, pcr_after.ptr, PCR_LEN);
265 pts->add_pcr_entry(pts, entry);
266 }
267 if (flags != PTS_SIMPLE_COMP_EVID_FLAG_NO_VALID)
268 {
269 policy_uri = attr_cast->get_policy_uri(attr_cast);
270 DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
271 " Verification Policies");
272 }
273
274 break;
275 }
276 case TCG_PTS_SIMPLE_EVID_FINAL:
277 {
278 tcg_pts_attr_simple_evid_final_t *attr_cast;
279 pts_simple_evid_final_flag_t flags;
280 pts_meas_algorithms_t composite_algorithm;
281 chunk_t pcr_comp;
282 chunk_t tpm_quote_sign;
283 chunk_t evid_sign;
284 bool evid_signature_included;
285
286 attr_cast = (tcg_pts_attr_simple_evid_final_t*)attr;
287 evid_signature_included = attr_cast->is_evid_sign_included(attr_cast);
288 flags = attr_cast->get_flags(attr_cast);
289
290 /** Optional Composite Hash Algorithm field is always present
291 * Field has value of all zeroes if not used.
292 * Implemented adhering the suggestion of Paul Sangster 28.Oct.2011
293 */
294 composite_algorithm = attr_cast->get_comp_hash_algorithm(attr_cast);
295
296 if ((flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2) ||
297 (flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2_CAP_VER))
298 {
299 DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
300 " TPM Quote Info2 structure");
301 break;
302 }
303 if (flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO)
304 {
305 chunk_t pcr_composite, quote_info;
306 pcr_comp = attr_cast->get_pcr_comp(attr_cast);
307 tpm_quote_sign = attr_cast->get_tpm_quote_sign(attr_cast);
308
309 if (!pcr_comp.ptr || !tpm_quote_sign.ptr)
310 {
311 DBG1(DBG_IMV, "PCR composite: %B", &pcr_comp);
312 DBG1(DBG_IMV, "TPM Quote Signature: %B", &tpm_quote_sign);
313 DBG1(DBG_IMV, "Either PCR Composite or Quote Signature missing");
314 return FALSE;
315 }
316
317 /* Construct PCR Composite and TPM Quote Info structures*/
318 if (!pts->get_quote_info(pts, composite_algorithm,
319 &pcr_composite, &quote_info))
320 {
321 DBG1(DBG_IMV, "unable to contruct TPM Quote Info");
322 return FALSE;
323 }
324
325 /* Check calculated PCR composite matches with received */
326 if (!chunk_equals(pcr_comp, pcr_composite))
327 {
328 DBG1(DBG_IMV, "received PCR Compsosite didn't match"
329 " with constructed");
330 chunk_clear(&pcr_composite);
331 chunk_clear(&quote_info);
332 return FALSE;
333 }
334 DBG2(DBG_IMV, "received PCR Composite matches with constructed");
335 chunk_clear(&pcr_composite);
336
337 if (!pts->verify_quote_signature(pts, quote_info, tpm_quote_sign))
338 {
339 chunk_clear(&quote_info);
340 return FALSE;
341 }
342
343 DBG2(DBG_IMV, "signature verification succeeded for "
344 "TPM Quote Info");
345 chunk_clear(&quote_info);
346 }
347
348 if (evid_signature_included)
349 {
350 /** TODO: What to do with Evidence Signature */
351 evid_sign = attr_cast->get_evid_sign(attr_cast);
352 DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
353 " Optional Evidence Signature field");
354 }
355
356 break;
357 }
358 case TCG_PTS_FILE_MEAS:
359 {
360 tcg_pts_attr_file_meas_t *attr_cast;
361 u_int16_t request_id;
362 int file_count, file_id;
363 pts_meas_algorithms_t algo;
364 pts_file_meas_t *measurements;
365 char *platform_info;
366 enumerator_t *e_hash;
367 bool is_dir;
368
369 platform_info = pts->get_platform_info(pts);
370 if (!pts_db || !platform_info)
371 {
372 break;
373 }
374
375 attr_cast = (tcg_pts_attr_file_meas_t*)attr;
376 measurements = attr_cast->get_measurements(attr_cast);
377 algo = pts->get_meas_algorithm(pts);
378 request_id = measurements->get_request_id(measurements);
379 file_count = measurements->get_file_count(measurements);
380
381 DBG1(DBG_IMV, "measurement request %d returned %d file%s:",
382 request_id, file_count, (file_count == 1) ? "":"s");
383
384 if (!attestation_state->check_off_request(attestation_state,
385 request_id, &file_id, &is_dir))
386 {
387 DBG1(DBG_IMV, " no entry found for this request");
388 break;
389 }
390
391 /* check hashes from database against measurements */
392 e_hash = pts_db->create_hash_enumerator(pts_db,
393 platform_info, algo, file_id, is_dir);
394 if (!measurements->verify(measurements, e_hash, is_dir))
395 {
396 attestation_state->set_measurement_error(attestation_state);
397 }
398 e_hash->destroy(e_hash);
399 break;
400 }
401 case TCG_PTS_UNIX_FILE_META:
402 {
403 tcg_pts_attr_file_meta_t *attr_cast;
404 int file_count;
405 pts_file_meta_t *metadata;
406 pts_file_metadata_t *entry;
407 time_t created, modified, accessed;
408 bool utc = FALSE;
409 enumerator_t *e;
410
411 attr_cast = (tcg_pts_attr_file_meta_t*)attr;
412 metadata = attr_cast->get_metadata(attr_cast);
413 file_count = metadata->get_file_count(metadata);
414
415 DBG1(DBG_IMV, "metadata request returned %d file%s:",
416 file_count, (file_count == 1) ? "":"s");
417
418 e = metadata->create_enumerator(metadata);
419 while (e->enumerate(e, &entry))
420 {
421 DBG1(DBG_IMV, " '%s' (%"PRIu64" bytes)"
422 " owner %"PRIu64", group %"PRIu64", type %N",
423 entry->filename, entry->filesize, entry->owner,
424 entry->group, pts_file_type_names, entry->type);
425
426 created = entry->created;
427 modified = entry->modified;
428 accessed = entry->accessed;
429
430 DBG1(DBG_IMV, " created %T, modified %T, accessed %T",
431 &created, utc, &modified, utc, &accessed, utc);
432 }
433 e->destroy(e);
434 break;
435 }
436
437 /* TODO: Not implemented yet */
438 case TCG_PTS_INTEG_MEAS_LOG:
439 /* Attributes using XML */
440 case TCG_PTS_TEMPL_REF_MANI_SET_META:
441 case TCG_PTS_VERIFICATION_RESULT:
442 case TCG_PTS_INTEG_REPORT:
443 /* On Windows only*/
444 case TCG_PTS_WIN_FILE_META:
445 case TCG_PTS_REGISTRY_VALUE:
446 /* Received on IMC side only*/
447 case TCG_PTS_REQ_PROTO_CAPS:
448 case TCG_PTS_DH_NONCE_PARAMS_REQ:
449 case TCG_PTS_DH_NONCE_FINISH:
450 case TCG_PTS_MEAS_ALGO:
451 case TCG_PTS_GET_TPM_VERSION_INFO:
452 case TCG_PTS_REQ_TEMPL_REF_MANI_SET_META:
453 case TCG_PTS_UPDATE_TEMPL_REF_MANI:
454 case TCG_PTS_GET_AIK:
455 case TCG_PTS_REQ_FUNCT_COMP_EVID:
456 case TCG_PTS_GEN_ATTEST_EVID:
457 case TCG_PTS_REQ_FILE_META:
458 case TCG_PTS_REQ_FILE_MEAS:
459 case TCG_PTS_REQ_INTEG_MEAS_LOG:
460 default:
461 DBG1(DBG_IMV, "received unsupported attribute '%N'",
462 tcg_attr_names, attr->get_type(attr));
463 break;
464 }
465 return TRUE;
466 }
467