finished refactoring functional components
[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_FILE_MEAS:
181 {
182 tcg_pts_attr_file_meas_t *attr_cast;
183 u_int16_t request_id;
184 int file_count, file_id;
185 pts_meas_algorithms_t algo;
186 pts_file_meas_t *measurements;
187 char *platform_info;
188 enumerator_t *e_hash;
189 bool is_dir;
190
191 platform_info = pts->get_platform_info(pts);
192 if (!pts_db || !platform_info)
193 {
194 DBG1(DBG_IMV, "%s%s%s not available",
195 (pts_db) ? "" : "pts database",
196 (!pts_db && !platform_info) ? "and" : "",
197 (platform_info) ? "" : "platform info");
198 break;
199 }
200
201 attr_cast = (tcg_pts_attr_file_meas_t*)attr;
202 measurements = attr_cast->get_measurements(attr_cast);
203 algo = pts->get_meas_algorithm(pts);
204 request_id = measurements->get_request_id(measurements);
205 file_count = measurements->get_file_count(measurements);
206
207 DBG1(DBG_IMV, "measurement request %d returned %d file%s:",
208 request_id, file_count, (file_count == 1) ? "":"s");
209
210 if (!attestation_state->check_off_file_meas_request(attestation_state,
211 request_id, &file_id, &is_dir))
212 {
213 DBG1(DBG_IMV, " no entry found for file measurement request %d",
214 request_id);
215 break;
216 }
217
218 /* check hashes from database against measurements */
219 e_hash = pts_db->create_file_hash_enumerator(pts_db,
220 platform_info, algo, file_id, is_dir);
221 if (!measurements->verify(measurements, e_hash, is_dir))
222 {
223 attestation_state->set_measurement_error(attestation_state);
224 }
225 e_hash->destroy(e_hash);
226 break;
227 }
228 case TCG_PTS_UNIX_FILE_META:
229 {
230 tcg_pts_attr_file_meta_t *attr_cast;
231 int file_count;
232 pts_file_meta_t *metadata;
233 pts_file_metadata_t *entry;
234 time_t created, modified, accessed;
235 bool utc = FALSE;
236 enumerator_t *e;
237
238 attr_cast = (tcg_pts_attr_file_meta_t*)attr;
239 metadata = attr_cast->get_metadata(attr_cast);
240 file_count = metadata->get_file_count(metadata);
241
242 DBG1(DBG_IMV, "metadata request returned %d file%s:",
243 file_count, (file_count == 1) ? "":"s");
244
245 e = metadata->create_enumerator(metadata);
246 while (e->enumerate(e, &entry))
247 {
248 DBG1(DBG_IMV, " '%s' (%"PRIu64" bytes)"
249 " owner %"PRIu64", group %"PRIu64", type %N",
250 entry->filename, entry->filesize, entry->owner,
251 entry->group, pts_file_type_names, entry->type);
252
253 created = entry->created;
254 modified = entry->modified;
255 accessed = entry->accessed;
256
257 DBG1(DBG_IMV, " created %T, modified %T, accessed %T",
258 &created, utc, &modified, utc, &accessed, utc);
259 }
260 e->destroy(e);
261 break;
262 }
263 case TCG_PTS_SIMPLE_COMP_EVID:
264 {
265 tcg_pts_attr_simple_comp_evid_t *attr_cast;
266 bool pcr_info_inclided, component_meas_found = FALSE;
267 pts_attr_simple_comp_evid_flag_t flags;
268 u_int32_t depth, extended_pcr;
269 u_int8_t measurement_type;
270 pts_comp_func_name_t *name;
271 pts_component_t *component;
272 pts_meas_algorithms_t hash_algorithm;
273 pts_pcr_transform_t transformation;
274 chunk_t measurement_time, policy_uri;
275 chunk_t pcr_before, pcr_after, measurement, comp_hash;
276 enumerator_t *enumerator;
277 char *platform_info;
278
279 attr_cast = (tcg_pts_attr_simple_comp_evid_t*)attr;
280 attr_info = attr->get_value(attr);
281
282 pcr_info_inclided = attr_cast->is_pcr_info_included(attr_cast);
283 flags = attr_cast->get_flags(attr_cast);
284 depth = attr_cast->get_sub_component_depth(attr_cast);
285 if (depth != 0)
286 {
287 DBG1(DBG_IMV, "Current version of Attestation IMV does not"
288 " support sub component measurement deeper than zero");
289 }
290 name = attr_cast->get_comp_func_name(attr_cast);
291 if (name->get_vendor_id(name) != PEN_ITA)
292 {
293 DBG1(DBG_IMV, "Current version of Attestation IMV supports"
294 "only functional component namings by ITA ");
295 break;
296 }
297
298 /* Check Family */
299 if (name->get_qualifier(name) & PTS_SIMPLE_COMP_EVID_FAMILY_MASK)
300 {
301 attr = ietf_attr_pa_tnc_error_create(PEN_TCG,
302 TCG_PTS_INVALID_NAME_FAM, attr_info);
303 attr_list->insert_last(attr_list, attr);
304 break;
305 }
306
307 /* Check if Unknown or Wildcard was set for qualifier */
308 if (name->get_qualifier(name) & PTS_QUALIFIER_WILDCARD)
309 {
310 DBG1(DBG_IMV, "Wildcard was set for the qualifier "
311 "of functional component");
312 return FALSE;
313 }
314 else if (name->get_qualifier(name) & PTS_QUALIFIER_UNKNOWN)
315 {
316 DBG1(DBG_IMV, "Unknown feature was set for the qualifier "
317 "of functional component");
318 return FALSE;
319 }
320
321 component = attestation_state->check_off_component(attestation_state,
322 name);
323 if (!component)
324 {
325 DBG1(DBG_IMV, " no entry found for component evidence request");
326 break;
327 }
328 component->verify(component);
329 component->destroy(component);
330
331 measurement_type = attr_cast->get_measurement_type(attr_cast);
332 hash_algorithm = attr_cast->get_hash_algorithm(attr_cast);
333 transformation = attr_cast->get_pcr_trans(attr_cast);
334 measurement_time = attr_cast->get_measurement_time(attr_cast);
335 measurement = attr_cast->get_comp_measurement(attr_cast);
336
337 platform_info = pts->get_platform_info(pts);
338 if (!pts_db || !platform_info)
339 {
340 DBG1(DBG_IMV, "%s%s%s not available",
341 (pts_db) ? "" : "pts database",
342 (!pts_db && !platform_info) ? "and" : "",
343 (platform_info) ? "" : "platform info");
344 break;
345 }
346
347 if (name->get_name(name) != PTS_ITA_COMP_FUNC_NAME_TBOOT &&
348 name->get_name(name) != PTS_ITA_COMP_FUNC_NAME_TGRUB)
349 {
350 DBG1(DBG_IMV, "Unknown functional component name: \"%d\"",
351 name->get_name(name));
352 return FALSE;
353 }
354
355 enumerator = pts_db->create_comp_hash_enumerator(pts_db,
356 platform_info, PTS_MEAS_ALGO_SHA1, name);
357 if (!enumerator)
358 {
359 break;
360 }
361 while (enumerator->enumerate(enumerator, &comp_hash))
362 {
363 if (chunk_equals(comp_hash, measurement))
364 {
365 DBG2(DBG_IMV, "Matching Functional Component Measurement:"
366 "%B", &measurement);
367 component_meas_found = TRUE;
368 break;
369 }
370 }
371 enumerator->destroy(enumerator);
372
373 if (!component_meas_found)
374 {
375 DBG1(DBG_IMV, "Unmatching Functional Component Measurement:"
376 "%B, expected: %B", &measurement, &comp_hash);
377 attestation_state->set_measurement_error(attestation_state);
378 }
379
380 /* Call getters of optional fields when corresponding flag is set */
381 if (pcr_info_inclided)
382 {
383 pcr_entry_t *entry;
384
385 extended_pcr = attr_cast->get_extended_pcr(attr_cast);
386 pcr_before = attr_cast->get_pcr_before_value(attr_cast);
387 pcr_after = attr_cast->get_pcr_after_value(attr_cast);
388
389 DBG3(DBG_IMV,"PCR: %d was extended with %B",
390 extended_pcr, &measurement);
391 DBG3(DBG_IMV,"PCR: %d before value: %B",
392 extended_pcr, &pcr_before);
393 DBG3(DBG_IMV,"PCR: %d after value: %B",
394 extended_pcr, &pcr_after);
395
396 entry = malloc_thing(pcr_entry_t);
397 entry->pcr_number = extended_pcr;
398 memcpy(entry->pcr_value, pcr_after.ptr, PCR_LEN);
399 pts->add_pcr_entry(pts, entry);
400 }
401 if (flags != PTS_SIMPLE_COMP_EVID_FLAG_NO_VALID)
402 {
403 policy_uri = attr_cast->get_policy_uri(attr_cast);
404 DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
405 " Verification Policies");
406 }
407
408 break;
409 }
410 case TCG_PTS_SIMPLE_EVID_FINAL:
411 {
412 tcg_pts_attr_simple_evid_final_t *attr_cast;
413 pts_simple_evid_final_flag_t flags;
414 pts_meas_algorithms_t composite_algorithm;
415 chunk_t pcr_comp;
416 chunk_t tpm_quote_sign;
417 chunk_t evid_sign;
418 bool evid_signature_included = FALSE, use_quote2 = FALSE,
419 ver_info_included = FALSE;
420 chunk_t pcr_composite, quote_info;
421
422 attr_cast = (tcg_pts_attr_simple_evid_final_t*)attr;
423 evid_signature_included = attr_cast->is_evid_sign_included(attr_cast);
424 flags = attr_cast->get_flags(attr_cast);
425
426 /** Optional Composite Hash Algorithm field is always present
427 * Field has value of all zeroes if not used.
428 * Implemented adhering the suggestion of Paul Sangster 28.Oct.2011
429 */
430 composite_algorithm = attr_cast->get_comp_hash_algorithm(attr_cast);
431
432 if (flags != PTS_SIMPLE_EVID_FINAL_FLAG_NO)
433 {
434 if ((flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2) ||
435 (flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2_CAP_VER))
436 {
437 use_quote2 = TRUE;
438 }
439 if (flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2_CAP_VER)
440 {
441 ver_info_included = TRUE;
442 }
443
444 pcr_comp = attr_cast->get_pcr_comp(attr_cast);
445 tpm_quote_sign = attr_cast->get_tpm_quote_sign(attr_cast);
446
447 if (!pcr_comp.ptr || !tpm_quote_sign.ptr)
448 {
449 DBG1(DBG_IMV, "PCR composite: %B", &pcr_comp);
450 DBG1(DBG_IMV, "TPM Quote Signature: %B", &tpm_quote_sign);
451 DBG1(DBG_IMV, "Either PCR Composite or Quote Signature missing");
452 return FALSE;
453 }
454
455 /* Construct PCR Composite and TPM Quote Info structures */
456 if (!pts->get_quote_info(pts, use_quote2, ver_info_included,
457 composite_algorithm, &pcr_composite, &quote_info))
458 {
459 DBG1(DBG_IMV, "unable to contruct TPM Quote Info");
460 return FALSE;
461 }
462
463 /* Check calculated PCR composite matches with received */
464 if (!chunk_equals(pcr_comp, pcr_composite))
465 {
466 DBG1(DBG_IMV, "received PCR Compsosite didn't match"
467 " with constructed");
468 chunk_clear(&pcr_composite);
469 chunk_clear(&quote_info);
470 return FALSE;
471 }
472 DBG2(DBG_IMV, "received PCR Composite matches with constructed");
473 chunk_clear(&pcr_composite);
474
475 if (!pts->verify_quote_signature(pts, quote_info, tpm_quote_sign))
476 {
477 chunk_clear(&quote_info);
478 return FALSE;
479 }
480
481 DBG2(DBG_IMV, "signature verification succeeded for "
482 "TPM Quote Info");
483 chunk_clear(&quote_info);
484 }
485
486 if (evid_signature_included)
487 {
488 /** TODO: What to do with Evidence Signature */
489 evid_sign = attr_cast->get_evid_sign(attr_cast);
490 DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
491 " Optional Evidence Signature field");
492 }
493
494 break;
495 }
496
497 /* TODO: Not implemented yet */
498 case TCG_PTS_INTEG_MEAS_LOG:
499 /* Attributes using XML */
500 case TCG_PTS_TEMPL_REF_MANI_SET_META:
501 case TCG_PTS_VERIFICATION_RESULT:
502 case TCG_PTS_INTEG_REPORT:
503 /* On Windows only*/
504 case TCG_PTS_WIN_FILE_META:
505 case TCG_PTS_REGISTRY_VALUE:
506 /* Received on IMC side only*/
507 case TCG_PTS_REQ_PROTO_CAPS:
508 case TCG_PTS_DH_NONCE_PARAMS_REQ:
509 case TCG_PTS_DH_NONCE_FINISH:
510 case TCG_PTS_MEAS_ALGO:
511 case TCG_PTS_GET_TPM_VERSION_INFO:
512 case TCG_PTS_REQ_TEMPL_REF_MANI_SET_META:
513 case TCG_PTS_UPDATE_TEMPL_REF_MANI:
514 case TCG_PTS_GET_AIK:
515 case TCG_PTS_REQ_FUNC_COMP_EVID:
516 case TCG_PTS_GEN_ATTEST_EVID:
517 case TCG_PTS_REQ_FILE_META:
518 case TCG_PTS_REQ_FILE_MEAS:
519 case TCG_PTS_REQ_INTEG_MEAS_LOG:
520 default:
521 DBG1(DBG_IMV, "received unsupported attribute '%N'",
522 tcg_attr_names, attr->get_type(attr));
523 break;
524 }
525 return TRUE;
526 }
527