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strongswan/src/libimcv/plugins/imv_attestation/imv_attestation_process.c

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/*
* Copyright (C) 2011-2012 Sansar Choinyambuu
* Copyright (C) 2011-2014 Andreas Steffen
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#define _GNU_SOURCE /* for stdndup() */
#include <string.h>
#include "imv_attestation_process.h"
#include <imcv.h>
#include <ietf/ietf_attr_pa_tnc_error.h>
#include <pts/pts.h>
#include <tcg/pts/tcg_pts_attr_aik.h>
#include <tcg/pts/tcg_pts_attr_dh_nonce_params_resp.h>
#include <tcg/pts/tcg_pts_attr_file_meas.h>
#include <tcg/pts/tcg_pts_attr_meas_algo.h>
#include <tcg/pts/tcg_pts_attr_proto_caps.h>
#include <tcg/pts/tcg_pts_attr_simple_comp_evid.h>
#include <tcg/pts/tcg_pts_attr_simple_evid_final.h>
#include <tcg/pts/tcg_pts_attr_tpm_version_info.h>
#include <tcg/pts/tcg_pts_attr_unix_file_meta.h>
#include <utils/debug.h>
#include <crypto/hashers/hasher.h>
#include <inttypes.h>
bool imv_attestation_process(pa_tnc_attr_t *attr, imv_msg_t *out_msg,
imv_state_t *state,
pts_meas_algorithms_t supported_algorithms,
pts_dh_group_t supported_dh_groups,
pts_database_t *pts_db,
credential_manager_t *pts_credmgr)
{
imv_session_t *session;
imv_attestation_state_t *attestation_state;
pen_type_t attr_type;
pts_t *pts;
session = state->get_session(state);
attestation_state = (imv_attestation_state_t*)state;
pts = attestation_state->get_pts(attestation_state);
attr_type = attr->get_type(attr);
switch (attr_type.type)
{
case TCG_PTS_PROTO_CAPS:
{
tcg_pts_attr_proto_caps_t *attr_cast;
pts_proto_caps_flag_t flags;
attr_cast = (tcg_pts_attr_proto_caps_t*)attr;
flags = attr_cast->get_flags(attr_cast);
pts->set_proto_caps(pts, flags);
break;
}
case TCG_PTS_MEAS_ALGO_SELECTION:
{
tcg_pts_attr_meas_algo_t *attr_cast;
pts_meas_algorithms_t selected_algorithm;
attr_cast = (tcg_pts_attr_meas_algo_t*)attr;
selected_algorithm = attr_cast->get_algorithms(attr_cast);
if (!(selected_algorithm & supported_algorithms))
{
DBG1(DBG_IMV, "PTS-IMC selected unsupported"
" measurement algorithm");
return FALSE;
}
pts->set_meas_algorithm(pts, selected_algorithm);
state->set_action_flags(state, IMV_ATTESTATION_ALGO);
break;
}
case TCG_PTS_DH_NONCE_PARAMS_RESP:
{
tcg_pts_attr_dh_nonce_params_resp_t *attr_cast;
int nonce_len, min_nonce_len;
pts_dh_group_t dh_group;
pts_meas_algorithms_t offered_algorithms, selected_algorithm;
chunk_t responder_value, responder_nonce;
attr_cast = (tcg_pts_attr_dh_nonce_params_resp_t*)attr;
responder_nonce = attr_cast->get_responder_nonce(attr_cast);
/* check compliance of responder nonce length */
min_nonce_len = lib->settings->get_int(lib->settings,
"%s.plugins.imv-attestation.min_nonce_len", 0, lib->ns);
nonce_len = responder_nonce.len;
if (nonce_len < PTS_MIN_NONCE_LEN ||
(min_nonce_len > 0 && nonce_len < min_nonce_len))
{
attr = pts_dh_nonce_error_create(
max(PTS_MIN_NONCE_LEN, min_nonce_len),
PTS_MAX_NONCE_LEN);
out_msg->add_attribute(out_msg, attr);
break;
}
dh_group = attr_cast->get_dh_group(attr_cast);
if (!(dh_group & supported_dh_groups))
{
DBG1(DBG_IMV, "PTS-IMC selected unsupported DH group");
return FALSE;
}
offered_algorithms = attr_cast->get_hash_algo_set(attr_cast);
selected_algorithm = pts_meas_algo_select(supported_algorithms,
offered_algorithms);
if (selected_algorithm == PTS_MEAS_ALGO_NONE)
{
attr = pts_hash_alg_error_create(supported_algorithms);
out_msg->add_attribute(out_msg, attr);
break;
}
pts->set_dh_hash_algorithm(pts, selected_algorithm);
if (!pts->create_dh_nonce(pts, dh_group, nonce_len))
{
return FALSE;
}
responder_value = attr_cast->get_responder_value(attr_cast);
pts->set_peer_public_value(pts, responder_value,
responder_nonce);
/* Calculate secret assessment value */
if (!pts->calculate_secret(pts))
{
return FALSE;
}
state->set_action_flags(state, IMV_ATTESTATION_DH_NONCE);
break;
}
case TCG_PTS_TPM_VERSION_INFO:
{
tcg_pts_attr_tpm_version_info_t *attr_cast;
chunk_t tpm_version_info;
attr_cast = (tcg_pts_attr_tpm_version_info_t*)attr;
tpm_version_info = attr_cast->get_tpm_version_info(attr_cast);
pts->set_tpm_version_info(pts, tpm_version_info);
break;
}
case TCG_PTS_AIK:
{
tcg_pts_attr_aik_t *attr_cast;
certificate_t *aik, *issuer;
public_key_t *public;
chunk_t keyid, keyid_hex, device_id;
int aik_id;
enumerator_t *e;
bool trusted = FALSE, trusted_chain = FALSE;
attr_cast = (tcg_pts_attr_aik_t*)attr;
aik = attr_cast->get_aik(attr_cast);
if (!aik)
{
DBG1(DBG_IMV, "AIK unavailable");
attestation_state->set_measurement_error(attestation_state,
IMV_ATTESTATION_ERROR_NO_TRUSTED_AIK);
break;
}
/* check trust into public key as stored in the database */
public = aik->get_public_key(aik);
public->get_fingerprint(public, KEYID_PUBKEY_INFO_SHA1, &keyid);
DBG1(DBG_IMV, "verifying AIK with keyid %#B", &keyid);
keyid_hex = chunk_to_hex(keyid, NULL, FALSE);
if (session->get_device_id(session, &device_id) &&
chunk_equals(keyid_hex, device_id))
{
trusted = session->get_device_trust(session);
}
else
{
DBG1(DBG_IMV, "device ID unknown or different from AIK keyid");
}
DBG1(DBG_IMV, "AIK public key is %strusted", trusted ? "" : "not ");
public->destroy(public);
chunk_free(&keyid_hex);
if (aik->get_type(aik) == CERT_X509)
{
e = pts_credmgr->create_trusted_enumerator(pts_credmgr,
KEY_ANY, aik->get_issuer(aik), FALSE);
while (e->enumerate(e, &issuer))
{
if (aik->issued_by(aik, issuer, NULL))
{
trusted_chain = TRUE;
break;
}
}
e->destroy(e);
DBG1(DBG_IMV, "AIK certificate is %strusted",
trusted_chain ? "" : "not ");
if (!trusted || !trusted_chain)
{
attestation_state->set_measurement_error(attestation_state,
IMV_ATTESTATION_ERROR_NO_TRUSTED_AIK);
break;
}
}
session->get_session_id(session, NULL, &aik_id);
pts->set_aik(pts, aik, aik_id);
break;
}
case TCG_PTS_FILE_MEAS:
{
TNC_IMV_Evaluation_Result eval;
TNC_IMV_Action_Recommendation rec;
tcg_pts_attr_file_meas_t *attr_cast;
uint16_t request_id;
int arg_int, file_count;
pts_meas_algorithms_t algo;
pts_file_meas_t *measurements;
imv_workitem_t *workitem, *found = NULL;
imv_workitem_type_t type;
char result_str[BUF_LEN];
bool is_dir, correct;
enumerator_t *enumerator;
eval = TNC_IMV_EVALUATION_RESULT_COMPLIANT;
algo = pts->get_meas_algorithm(pts);
attr_cast = (tcg_pts_attr_file_meas_t*)attr;
measurements = attr_cast->get_measurements(attr_cast);
request_id = measurements->get_request_id(measurements);
file_count = measurements->get_file_count(measurements);
DBG1(DBG_IMV, "measurement request %d returned %d file%s:",
request_id, file_count, (file_count == 1) ? "":"s");
if (request_id)
{
enumerator = session->create_workitem_enumerator(session);
while (enumerator->enumerate(enumerator, &workitem))
{
/* request ID consist of lower 16 bits of workitem ID */
if ((workitem->get_id(workitem) & 0xffff) == request_id)
{
found = workitem;
break;
}
}
if (!found)
{
DBG1(DBG_IMV, " no entry found for file measurement "
"request %d", request_id);
enumerator->destroy(enumerator);
break;
}
type = found->get_type(found);
arg_int = found->get_arg_int(found);
switch (type)
{
default:
case IMV_WORKITEM_FILE_REF_MEAS:
case IMV_WORKITEM_FILE_MEAS:
is_dir = FALSE;
break;
case IMV_WORKITEM_DIR_REF_MEAS:
case IMV_WORKITEM_DIR_MEAS:
is_dir = TRUE;
}
switch (type)
{
case IMV_WORKITEM_FILE_MEAS:
case IMV_WORKITEM_DIR_MEAS:
{
enumerator_t *e;
/* check hashes from database against measurements */
e = pts_db->create_file_hash_enumerator(pts_db,
pts->get_platform_id(pts),
algo, is_dir, arg_int);
if (!e)
{
eval = TNC_IMV_EVALUATION_RESULT_ERROR;
break;
}
correct = measurements->verify(measurements, e, is_dir);
if (!correct)
{
attestation_state->set_measurement_error(
attestation_state,
IMV_ATTESTATION_ERROR_FILE_MEAS_FAIL);
eval = TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MINOR;
}
e->destroy(e);
snprintf(result_str, BUF_LEN, "%s measurement%s correct",
is_dir ? "directory" : "file",
correct ? "" : " not");
break;
}
case IMV_WORKITEM_FILE_REF_MEAS:
case IMV_WORKITEM_DIR_REF_MEAS:
{
enumerator_t *e;
char *filename;
chunk_t measurement;
e = measurements->create_enumerator(measurements);
while (e->enumerate(e, &filename, &measurement))
{
if (pts_db->add_file_measurement(pts_db,
pts->get_platform_id(pts), algo, measurement,
filename, is_dir, arg_int) != SUCCESS)
{
eval = TNC_IMV_EVALUATION_RESULT_ERROR;
}
}
e->destroy(e);
snprintf(result_str, BUF_LEN, "%s reference measurement "
"successful", is_dir ? "directory" : "file");
break;
}
default:
break;
}
session->remove_workitem(session, enumerator);
enumerator->destroy(enumerator);
rec = found->set_result(found, result_str, eval);
state->update_recommendation(state, rec, eval);
imcv_db->finalize_workitem(imcv_db, found);
found->destroy(found);
}
else
{
measurements->check(measurements, pts_db,
pts->get_platform_id(pts), algo);
}
break;
}
case TCG_PTS_UNIX_FILE_META:
{
tcg_pts_attr_file_meta_t *attr_cast;
int file_count;
pts_file_meta_t *metadata;
pts_file_metadata_t *entry;
time_t created, modified, accessed;
bool utc = FALSE;
enumerator_t *e;
attr_cast = (tcg_pts_attr_file_meta_t*)attr;
metadata = attr_cast->get_metadata(attr_cast);
file_count = metadata->get_file_count(metadata);
DBG1(DBG_IMV, "metadata request returned %d file%s:",
file_count, (file_count == 1) ? "":"s");
e = metadata->create_enumerator(metadata);
while (e->enumerate(e, &entry))
{
DBG1(DBG_IMV, " '%s' (%"PRIu64" bytes)"
" owner %"PRIu64", group %"PRIu64", type %N",
entry->filename, entry->filesize, entry->owner,
entry->group, pts_file_type_names, entry->type);
created = entry->created;
modified = entry->modified;
accessed = entry->accessed;
DBG1(DBG_IMV, " created %T, modified %T, accessed %T",
&created, utc, &modified, utc, &accessed, utc);
}
e->destroy(e);
break;
}
case TCG_PTS_SIMPLE_COMP_EVID:
{
tcg_pts_attr_simple_comp_evid_t *attr_cast;
pts_comp_func_name_t *name;
pts_comp_evidence_t *evidence;
pts_component_t *comp;
uint32_t depth;
status_t status;
attr_cast = (tcg_pts_attr_simple_comp_evid_t*)attr;
evidence = attr_cast->get_comp_evidence(attr_cast);
name = evidence->get_comp_func_name(evidence, &depth);
comp = attestation_state->get_component(attestation_state, name);
if (!comp)
{
DBG1(DBG_IMV, " no entry found for component evidence request");
break;
}
status = comp->verify(comp, name->get_qualifier(name), pts, evidence);
if (status == VERIFY_ERROR || status == FAILED)
{
attestation_state->set_measurement_error(attestation_state,
IMV_ATTESTATION_ERROR_COMP_EVID_FAIL);
name->log(name, " measurement mismatch for ");
}
break;
}
case TCG_PTS_SIMPLE_EVID_FINAL:
{
tcg_pts_attr_simple_evid_final_t *attr_cast;
uint8_t flags;
pts_meas_algorithms_t comp_hash_algorithm;
chunk_t pcr_comp, tpm_quote_sig, evid_sig;
chunk_t pcr_composite, quote_info, result_buf;
imv_workitem_t *workitem;
imv_reason_string_t *reason_string;
enumerator_t *enumerator;
bool use_quote2, use_ver_info;
bio_writer_t *result;
attr_cast = (tcg_pts_attr_simple_evid_final_t*)attr;
flags = attr_cast->get_quote_info(attr_cast, &comp_hash_algorithm,
&pcr_comp, &tpm_quote_sig);
if (flags != PTS_SIMPLE_EVID_FINAL_NO)
{
use_quote2 = (flags == PTS_SIMPLE_EVID_FINAL_QUOTE_INFO2 ||
flags == PTS_SIMPLE_EVID_FINAL_QUOTE_INFO2_CAP_VER);
use_ver_info = (flags == PTS_SIMPLE_EVID_FINAL_QUOTE_INFO2_CAP_VER);
/* Construct PCR Composite and TPM Quote Info structures */
if (!pts->get_quote_info(pts, use_quote2, use_ver_info,
comp_hash_algorithm, &pcr_composite, &quote_info))
{
DBG1(DBG_IMV, "unable to construct TPM Quote Info");
return FALSE;
}
if (!chunk_equals(pcr_comp, pcr_composite))
{
DBG1(DBG_IMV, "received PCR Composite does not match "
"constructed one");
attestation_state->set_measurement_error(attestation_state,
IMV_ATTESTATION_ERROR_TPM_QUOTE_FAIL);
goto quote_error;
}
DBG2(DBG_IMV, "received PCR Composite matches constructed one");
if (!pts->verify_quote_signature(pts, quote_info, tpm_quote_sig))
{
attestation_state->set_measurement_error(attestation_state,
IMV_ATTESTATION_ERROR_TPM_QUOTE_FAIL);
goto quote_error;
}
DBG2(DBG_IMV, "TPM Quote Info signature verification successful");
quote_error:
free(pcr_composite.ptr);
free(quote_info.ptr);
/**
* Finalize any pending measurement registrations and check
* if all expected component measurements were received
*/
result = bio_writer_create(128);
attestation_state->finalize_components(attestation_state,
result);
enumerator = session->create_workitem_enumerator(session);
while (enumerator->enumerate(enumerator, &workitem))
{
if (workitem->get_type(workitem) == IMV_WORKITEM_TPM_ATTEST)
{
TNC_IMV_Action_Recommendation rec;
TNC_IMV_Evaluation_Result eval;
uint32_t error;
error = attestation_state->get_measurement_error(
attestation_state);
if (error & (IMV_ATTESTATION_ERROR_COMP_EVID_FAIL |
IMV_ATTESTATION_ERROR_COMP_EVID_PEND |
IMV_ATTESTATION_ERROR_TPM_QUOTE_FAIL))
{
reason_string = imv_reason_string_create("en", ", ");
attestation_state->add_comp_evid_reasons(
attestation_state, reason_string);
result->write_data(result, chunk_from_str("; "));
result->write_data(result,
reason_string->get_encoding(reason_string));
reason_string->destroy(reason_string);
eval = TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MINOR;
}
else
{
eval = TNC_IMV_EVALUATION_RESULT_COMPLIANT;
}
session->remove_workitem(session, enumerator);
result->write_uint8(result, '\0');
result_buf = result->get_buf(result);
rec = workitem->set_result(workitem, result_buf.ptr,
eval);
state->update_recommendation(state, rec, eval);
imcv_db->finalize_workitem(imcv_db, workitem);
workitem->destroy(workitem);
attestation_state->set_handshake_state(attestation_state,
IMV_ATTESTATION_STATE_END);
break;
}
}
enumerator->destroy(enumerator);
result->destroy(result);
}
if (attr_cast->get_evid_sig(attr_cast, &evid_sig))
{
/** TODO: What to do with Evidence Signature */
DBG1(DBG_IMV, "this version of the Attestation IMV can not "
"handle Evidence Signatures");
}
break;
}
/* TODO: Not implemented yet */
case TCG_PTS_INTEG_MEAS_LOG:
/* Attributes using XML */
case TCG_PTS_TEMPL_REF_MANI_SET_META:
case TCG_PTS_VERIFICATION_RESULT:
case TCG_PTS_INTEG_REPORT:
/* On Windows only*/
case TCG_PTS_WIN_FILE_META:
case TCG_PTS_REGISTRY_VALUE:
/* Received on IMC side only*/
case TCG_PTS_REQ_PROTO_CAPS:
case TCG_PTS_DH_NONCE_PARAMS_REQ:
case TCG_PTS_DH_NONCE_FINISH:
case TCG_PTS_MEAS_ALGO:
case TCG_PTS_GET_TPM_VERSION_INFO:
case TCG_PTS_REQ_TEMPL_REF_MANI_SET_META:
case TCG_PTS_UPDATE_TEMPL_REF_MANI:
case TCG_PTS_GET_AIK:
case TCG_PTS_REQ_FUNC_COMP_EVID:
case TCG_PTS_GEN_ATTEST_EVID:
case TCG_PTS_REQ_FILE_META:
case TCG_PTS_REQ_FILE_MEAS:
case TCG_PTS_REQ_INTEG_MEAS_LOG:
default:
DBG1(DBG_IMV, "received unsupported attribute '%N'",
tcg_attr_names, attr->get_type(attr));
break;
}
return TRUE;
}
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