1ba627ec9d3b4733c1b28af19bf170e8b963d09d
[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_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 /* TODO: Implement check of components with its sub-components */
201 if (depth != 0)
202 {
203 DBG1(DBG_IMV, "Current version of Attestation IMV does not"
204 " support sub component measurement deeper than zero");
205 }
206 comp_vendor_id = attr_cast->get_spec_comp_funct_name_vendor_id(
207 attr_cast);
208 if (comp_vendor_id != PEN_TCG)
209 {
210 DBG1(DBG_IMV, "Current version of Attestation IMV supports"
211 "only functional component namings by TCG ");
212 break;
213 }
214 family = attr_cast->get_family(attr_cast);
215 if (family)
216 {
217 attr = ietf_attr_pa_tnc_error_create(PEN_TCG,
218 TCG_PTS_INVALID_NAME_FAM, attr_info);
219 attr_list->insert_last(attr_list, attr);
220 break;
221 }
222 qualifier = attr_cast->get_qualifier(attr_cast);
223
224 /* Check if Unknown or Wildcard was set for qualifier */
225 if (qualifier.kernel && qualifier.sub_component &&
226 (qualifier.type & PTS_FUNC_COMP_TYPE_ALL))
227 {
228 DBG1(DBG_IMV, "Wildcard was set for the qualifier "
229 "of functional component");
230 return FALSE;
231 }
232 else if (!qualifier.kernel && !qualifier.sub_component &&
233 (qualifier.type & PTS_FUNC_COMP_TYPE_UNKNOWN))
234 {
235 DBG1(DBG_IMV, "Unknown feature was set for the qualifier "
236 "of functional component");
237 return FALSE;
238 }
239 else
240 {
241 /* TODO: Implement what todo with received qualifier */
242 }
243
244 name = attr_cast->get_comp_funct_name(attr_cast);
245 measurement_type = attr_cast->get_measurement_type(attr_cast);
246 hash_algorithm = attr_cast->get_hash_algorithm(attr_cast);
247 transformation = attr_cast->get_pcr_trans(attr_cast);
248 measurement_time = attr_cast->get_measurement_time(attr_cast);
249
250 /* Call getters of optional fields when corresponding flag is set */
251 if (pcr_info_inclided)
252 {
253 pcr_entry_t *entry;
254
255 extended_pcr = attr_cast->get_extended_pcr(attr_cast);
256 pcr_before = attr_cast->get_pcr_before_value(attr_cast);
257 pcr_after = attr_cast->get_pcr_after_value(attr_cast);
258 measurement = attr_cast->get_comp_measurement(attr_cast);
259
260 DBG4(DBG_IMV,"PCR: %d was extended with %B",
261 extended_pcr, &measurement);
262 DBG4(DBG_IMV,"PCR: %d before value: %B",
263 extended_pcr, &pcr_before);
264 DBG4(DBG_IMV,"PCR: %d after value: %B",
265 extended_pcr, &pcr_after);
266
267 entry = malloc_thing(pcr_entry_t);
268 entry->pcr_number = extended_pcr;
269 strncpy(entry->pcr_value, pcr_after.ptr, PCR_LEN);
270 pts->add_pcr_entry(pts, entry);
271
272 }
273 if (flags != PTS_SIMPLE_COMP_EVID_FLAG_NO_VALID)
274 {
275 policy_uri = attr_cast->get_policy_uri(attr_cast);
276 DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
277 " Verification Policies");
278 }
279
280 break;
281 }
282 case TCG_PTS_SIMPLE_EVID_FINAL:
283 {
284 tcg_pts_attr_simple_evid_final_t *attr_cast;
285 pts_simple_evid_final_flag_t flags;
286 pts_meas_algorithms_t composite_algorithm;
287 chunk_t pcr_comp;
288 chunk_t tpm_quote_sign;
289 chunk_t evid_sign;
290 bool evid_signature_included;
291
292 attr_cast = (tcg_pts_attr_simple_evid_final_t*)attr;
293 evid_signature_included = attr_cast->is_evid_sign_included(attr_cast);
294 flags = attr_cast->get_flags(attr_cast);
295
296 /** Optional Composite Hash Algorithm field is always present
297 * Field has value of all zeroes if not used.
298 * Implemented adhering the suggestion of Paul Sangster 28.Oct.2011
299 */
300 composite_algorithm = attr_cast->get_comp_hash_algorithm(attr_cast);
301
302 if ((flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2) ||
303 (flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2_CAP_VER))
304 {
305 DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
306 " TPM Quote Info2 structure");
307 break;
308 }
309 if (flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO)
310 {
311 chunk_t pcr_composite, quote_info, quote_digest;
312 hasher_t *hasher;
313 pcr_comp = attr_cast->get_pcr_comp(attr_cast);
314 tpm_quote_sign = attr_cast->get_tpm_quote_sign(attr_cast);
315
316 /* Construct PCR Composite and TPM Quote Info structures*/
317 if (!pts->get_quote_info(pts, composite_algorithm,
318 &pcr_composite, &quote_info))
319 {
320 DBG1(DBG_IMV, "unable to contruct TPM Quote Info");
321 return FALSE;
322 }
323
324 /* Check calculated PCR composite matches with received */
325 if (pcr_comp.ptr && !chunk_equals(pcr_comp, pcr_composite))
326 {
327 DBG1(DBG_IMV, "received PCR Compsosite didn't match"
328 " with constructed");
329 chunk_clear(&pcr_composite);
330 chunk_clear(&quote_info);
331 return FALSE;
332 }
333 DBG2(DBG_IMV, "received PCR Composite matches with constructed");
334 chunk_clear(&pcr_composite);
335
336 /* SHA1(TPM Quote Info) expected from IMC */
337 hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
338 hasher->allocate_hash(hasher, quote_info, &quote_digest);
339 hasher->destroy(hasher);
340 chunk_clear(&quote_info);
341
342 if (tpm_quote_sign.ptr &&
343 !pts->verify_quote_signature(pts, quote_digest,
344 tpm_quote_sign))
345 {
346 chunk_clear(&quote_digest);
347 return FALSE;
348 }
349
350 DBG2(DBG_IMV, "signature verification succeeded for "
351 "TPM Quote Info");
352 chunk_clear(&quote_digest);
353 }
354
355 if (evid_signature_included)
356 {
357 /** TODO: What to do with Evidence Signature */
358 evid_sign = attr_cast->get_evid_sign(attr_cast);
359 DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
360 " Optional Evidence Signature field");
361 }
362
363 break;
364 }
365 case TCG_PTS_FILE_MEAS:
366 {
367 tcg_pts_attr_file_meas_t *attr_cast;
368 u_int16_t request_id;
369 int file_count, file_id;
370 pts_meas_algorithms_t algo;
371 pts_file_meas_t *measurements;
372 char *platform_info;
373 enumerator_t *e_hash;
374 bool is_dir;
375
376 platform_info = pts->get_platform_info(pts);
377 if (!pts_db || !platform_info)
378 {
379 break;
380 }
381
382 attr_cast = (tcg_pts_attr_file_meas_t*)attr;
383 measurements = attr_cast->get_measurements(attr_cast);
384 algo = pts->get_meas_algorithm(pts);
385 request_id = measurements->get_request_id(measurements);
386 file_count = measurements->get_file_count(measurements);
387
388 DBG1(DBG_IMV, "measurement request %d returned %d file%s:",
389 request_id, file_count, (file_count == 1) ? "":"s");
390
391 if (!attestation_state->check_off_request(attestation_state,
392 request_id, &file_id, &is_dir))
393 {
394 DBG1(DBG_IMV, " no entry found for this request");
395 break;
396 }
397
398 /* check hashes from database against measurements */
399 e_hash = pts_db->create_hash_enumerator(pts_db,
400 platform_info, algo, file_id, is_dir);
401 if (!measurements->verify(measurements, e_hash, is_dir))
402 {
403 attestation_state->set_measurement_error(attestation_state);
404 }
405 e_hash->destroy(e_hash);
406 break;
407 }
408 case TCG_PTS_UNIX_FILE_META:
409 {
410 tcg_pts_attr_file_meta_t *attr_cast;
411 int file_count;
412 pts_file_meta_t *metadata;
413 pts_file_metadata_t *entry;
414 time_t created, modified, accessed;
415 bool utc = FALSE;
416 enumerator_t *e;
417
418 attr_cast = (tcg_pts_attr_file_meta_t*)attr;
419 metadata = attr_cast->get_metadata(attr_cast);
420 file_count = metadata->get_file_count(metadata);
421
422 DBG1(DBG_IMV, "metadata request returned %d file%s:",
423 file_count, (file_count == 1) ? "":"s");
424
425 e = metadata->create_enumerator(metadata);
426 while (e->enumerate(e, &entry))
427 {
428 DBG1(DBG_IMV, " '%s' (%"PRIu64" bytes)"
429 " owner %"PRIu64", group %"PRIu64", type %N",
430 entry->filename, entry->filesize, entry->owner,
431 entry->group, pts_file_type_names, entry->type);
432
433 created = entry->created;
434 modified = entry->modified;
435 accessed = entry->accessed;
436
437 DBG1(DBG_IMV, " created %T, modified %T, accessed %T",
438 &created, utc, &modified, utc, &accessed, utc);
439 }
440 e->destroy(e);
441 break;
442 }
443
444 /* TODO: Not implemented yet */
445 case TCG_PTS_INTEG_MEAS_LOG:
446 /* Attributes using XML */
447 case TCG_PTS_TEMPL_REF_MANI_SET_META:
448 case TCG_PTS_VERIFICATION_RESULT:
449 case TCG_PTS_INTEG_REPORT:
450 /* On Windows only*/
451 case TCG_PTS_WIN_FILE_META:
452 case TCG_PTS_REGISTRY_VALUE:
453 /* Received on IMC side only*/
454 case TCG_PTS_REQ_PROTO_CAPS:
455 case TCG_PTS_DH_NONCE_PARAMS_REQ:
456 case TCG_PTS_DH_NONCE_FINISH:
457 case TCG_PTS_MEAS_ALGO:
458 case TCG_PTS_GET_TPM_VERSION_INFO:
459 case TCG_PTS_REQ_TEMPL_REF_MANI_SET_META:
460 case TCG_PTS_UPDATE_TEMPL_REF_MANI:
461 case TCG_PTS_GET_AIK:
462 case TCG_PTS_REQ_FUNCT_COMP_EVID:
463 case TCG_PTS_GEN_ATTEST_EVID:
464 case TCG_PTS_REQ_FILE_META:
465 case TCG_PTS_REQ_FILE_MEAS:
466 case TCG_PTS_REQ_INTEG_MEAS_LOG:
467 default:
468 DBG1(DBG_IMV, "received unsupported attribute '%N'",
469 tcg_attr_names, attr->get_type(attr));
470 break;
471 }
472 return TRUE;
473 }
474