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strongswan/src/libpts/plugins/imv_attestation/imv_attestation_agent.c

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/*
* Copyright (C) 2011-2012 Sansar Choinyambuu
* Copyright (C) 2011-2013 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_agent.h"
#include "imv_attestation_state.h"
#include "imv_attestation_process.h"
#include "imv_attestation_build.h"
#include <imcv.h>
#include <imv/imv_agent.h>
#include <imv/imv_msg.h>
#include <ietf/ietf_attr.h>
#include <ietf/ietf_attr_attr_request.h>
#include <ietf/ietf_attr_pa_tnc_error.h>
#include <ietf/ietf_attr_product_info.h>
#include <ietf/ietf_attr_string_version.h>
#include <libpts.h>
#include <pts/pts.h>
#include <pts/pts_database.h>
#include <pts/pts_creds.h>
#include <pts/components/ita/ita_comp_func_name.h>
#include <tcg/tcg_attr.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_req_file_meas.h>
#include <tcg/pts/tcg_pts_attr_req_file_meta.h>
#include <tncif_pa_subtypes.h>
#include <pen/pen.h>
#include <utils/debug.h>
#include <credentials/credential_manager.h>
#include <collections/linked_list.h>
typedef struct private_imv_attestation_agent_t private_imv_attestation_agent_t;
/* Subscribed PA-TNC message subtypes */
static pen_type_t msg_types[] = {
{ PEN_TCG, PA_SUBTYPE_TCG_PTS },
{ PEN_IETF, PA_SUBTYPE_IETF_OPERATING_SYSTEM }
};
/**
* Private data of an imv_attestation_agent_t object.
*/
struct private_imv_attestation_agent_t {
/**
* Public members of imv_attestation_agent_t
*/
imv_agent_if_t public;
/**
* IMV agent responsible for generic functions
*/
imv_agent_t *agent;
/**
* Supported PTS measurement algorithms
*/
pts_meas_algorithms_t supported_algorithms;
/**
* Supported PTS Diffie Hellman Groups
*/
pts_dh_group_t supported_dh_groups;
/**
* PTS file measurement database
*/
pts_database_t *pts_db;
/**
* PTS credentials
*/
pts_creds_t *pts_creds;
/**
* PTS credential manager
*/
credential_manager_t *pts_credmgr;
};
METHOD(imv_agent_if_t, bind_functions, TNC_Result,
private_imv_attestation_agent_t *this, TNC_TNCS_BindFunctionPointer bind_function)
{
return this->agent->bind_functions(this->agent, bind_function);
}
METHOD(imv_agent_if_t, notify_connection_change, TNC_Result,
private_imv_attestation_agent_t *this, TNC_ConnectionID id,
TNC_ConnectionState new_state)
{
imv_state_t *state;
switch (new_state)
{
case TNC_CONNECTION_STATE_CREATE:
state = imv_attestation_state_create(id);
return this->agent->create_state(this->agent, state);
case TNC_CONNECTION_STATE_DELETE:
return this->agent->delete_state(this->agent, id);
default:
return this->agent->change_state(this->agent, id, new_state, NULL);
}
}
/**
* Process a received message
*/
static TNC_Result receive_msg(private_imv_attestation_agent_t *this,
imv_state_t *state, imv_msg_t *in_msg)
{
imv_attestation_state_t *attestation_state;
imv_msg_t *out_msg;
enumerator_t *enumerator;
pa_tnc_attr_t *attr;
pen_type_t type;
TNC_Result result;
pts_t *pts;
chunk_t os_name = chunk_empty;
chunk_t os_version = chunk_empty;
bool fatal_error = FALSE;
/* parse received PA-TNC message and handle local and remote errors */
result = in_msg->receive(in_msg, &fatal_error);
if (result != TNC_RESULT_SUCCESS)
{
return result;
}
attestation_state = (imv_attestation_state_t*)state;
pts = attestation_state->get_pts(attestation_state);
out_msg = imv_msg_create_as_reply(in_msg);
out_msg->set_msg_type(out_msg, msg_types[0]);
/* analyze PA-TNC attributes */
enumerator = in_msg->create_attribute_enumerator(in_msg);
while (enumerator->enumerate(enumerator, &attr))
{
type = attr->get_type(attr);
if (type.vendor_id == PEN_IETF)
{
switch (type.type)
{
case IETF_ATTR_PA_TNC_ERROR:
{
ietf_attr_pa_tnc_error_t *error_attr;
pen_type_t error_code;
chunk_t msg_info;
error_attr = (ietf_attr_pa_tnc_error_t*)attr;
error_code = error_attr->get_error_code(error_attr);
if (error_code.vendor_id == PEN_TCG)
{
msg_info = error_attr->get_msg_info(error_attr);
DBG1(DBG_IMV, "received TCG-PTS error '%N'",
pts_error_code_names, error_code.type);
DBG1(DBG_IMV, "error information: %B", &msg_info);
fatal_error = TRUE;
}
break;
}
case IETF_ATTR_PRODUCT_INFORMATION:
{
ietf_attr_product_info_t *attr_cast;
attr_cast = (ietf_attr_product_info_t*)attr;
os_name = attr_cast->get_info(attr_cast, NULL, NULL);
break;
}
case IETF_ATTR_STRING_VERSION:
{
ietf_attr_string_version_t *attr_cast;
attr_cast = (ietf_attr_string_version_t*)attr;
os_version = attr_cast->get_version(attr_cast, NULL, NULL);
break;
}
default:
break;
}
}
else if (type.vendor_id == PEN_TCG)
{
if (!imv_attestation_process(attr, out_msg, state,
this->supported_algorithms, this->supported_dh_groups,
this->pts_db, this->pts_credmgr))
{
result = TNC_RESULT_FATAL;
break;
}
}
}
enumerator->destroy(enumerator);
/**
* The IETF Product Information and String Version attributes
* are supposed to arrive in the same PA-TNC message
*/
if (os_name.len && os_version.len)
{
pts->set_platform_info(pts, os_name, os_version);
}
if (fatal_error || result != TNC_RESULT_SUCCESS)
{
state->set_recommendation(state,
TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
TNC_IMV_EVALUATION_RESULT_ERROR);
result = out_msg->send_assessment(out_msg);
out_msg->destroy(out_msg);
if (result != TNC_RESULT_SUCCESS)
{
return result;
}
return this->agent->provide_recommendation(this->agent, state);
}
/* send PA-TNC message with excl flag set */
result = out_msg->send(out_msg, TRUE);
out_msg->destroy(out_msg);
return result;
}
METHOD(imv_agent_if_t, receive_message, TNC_Result,
private_imv_attestation_agent_t *this, TNC_ConnectionID id,
TNC_MessageType msg_type, chunk_t msg)
{
imv_state_t *state;
imv_msg_t *in_msg;
TNC_Result result;
if (!this->agent->get_state(this->agent, id, &state))
{
return TNC_RESULT_FATAL;
}
in_msg = imv_msg_create_from_data(this->agent, state, id, msg_type, msg);
result = receive_msg(this, state, in_msg);
in_msg->destroy(in_msg);
return result;
}
METHOD(imv_agent_if_t, receive_message_long, TNC_Result,
private_imv_attestation_agent_t *this, TNC_ConnectionID id,
TNC_UInt32 src_imc_id, TNC_UInt32 dst_imv_id,
TNC_VendorID msg_vid, TNC_MessageSubtype msg_subtype, chunk_t msg)
{
imv_state_t *state;
imv_msg_t *in_msg;
TNC_Result result;
if (!this->agent->get_state(this->agent, id, &state))
{
return TNC_RESULT_FATAL;
}
in_msg = imv_msg_create_from_long_data(this->agent, state, id,
src_imc_id, dst_imv_id, msg_vid, msg_subtype, msg);
result = receive_msg(this, state, in_msg);
in_msg->destroy(in_msg);
return result;
}
METHOD(imv_agent_if_t, batch_ending, TNC_Result,
private_imv_attestation_agent_t *this, TNC_ConnectionID id)
{
imv_msg_t *out_msg;
imv_state_t *state;
imv_session_t *session;
imv_attestation_state_t *attestation_state;
imv_attestation_handshake_state_t handshake_state;
imv_workitem_t *workitem;
TNC_IMV_Action_Recommendation rec;
TNC_IMV_Evaluation_Result eval;
TNC_IMVID imv_id;
TNC_Result result = TNC_RESULT_SUCCESS;
pts_t *pts;
char *platform_info;
enumerator_t *enumerator;
if (!this->agent->get_state(this->agent, id, &state))
{
return TNC_RESULT_FATAL;
}
attestation_state = (imv_attestation_state_t*)state;
pts = attestation_state->get_pts(attestation_state);
handshake_state = attestation_state->get_handshake_state(attestation_state);
platform_info = pts->get_platform_info(pts);
session = state->get_session(state);
imv_id = this->agent->get_id(this->agent);
/* exit if a recommendation has already been provided */
if (state->get_action_flags(state) & IMV_ATTESTATION_FLAG_REC)
{
return TNC_RESULT_SUCCESS;
}
/* send an IETF attribute request if no platform info was received */
if (!platform_info &&
!(state->get_action_flags(state) & IMV_ATTESTATION_FLAG_ATTR_REQ))
{
pa_tnc_attr_t *attr;
ietf_attr_attr_request_t *attr_cast;
imv_msg_t *os_msg;
attr = ietf_attr_attr_request_create(PEN_IETF,
IETF_ATTR_PRODUCT_INFORMATION);
attr_cast = (ietf_attr_attr_request_t*)attr;
attr_cast->add(attr_cast, PEN_IETF, IETF_ATTR_STRING_VERSION);
os_msg = imv_msg_create(this->agent, state, id, imv_id, TNC_IMCID_ANY,
msg_types[1]);
os_msg->add_attribute(os_msg, attr);
result = os_msg->send(os_msg, FALSE);
os_msg->destroy(os_msg);
if (result != TNC_RESULT_SUCCESS)
{
return result;
}
state->set_action_flags(state, IMV_ATTESTATION_FLAG_ATTR_REQ);
}
if (handshake_state == IMV_ATTESTATION_STATE_INIT)
{
pa_tnc_attr_t *attr;
pts_proto_caps_flag_t flags;
out_msg = imv_msg_create(this->agent, state, id, imv_id, TNC_IMCID_ANY,
msg_types[0]);
/* Send Request Protocol Capabilities attribute */
flags = pts->get_proto_caps(pts);
attr = tcg_pts_attr_proto_caps_create(flags, TRUE);
attr->set_noskip_flag(attr, TRUE);
out_msg->add_attribute(out_msg, attr);
/* Send Measurement Algorithms attribute */
attr = tcg_pts_attr_meas_algo_create(this->supported_algorithms, FALSE);
attr->set_noskip_flag(attr, TRUE);
out_msg->add_attribute(out_msg, attr);
attestation_state->set_handshake_state(attestation_state,
IMV_ATTESTATION_STATE_DISCOVERY);
/* send these initial PTS attributes and exit */
result = out_msg->send(out_msg, FALSE);
out_msg->destroy(out_msg);
return result;
}
/* exit if we are not ready yet for PTS measurements */
if (!platform_info || !session ||
!(state->get_action_flags(state) & IMV_ATTESTATION_FLAG_ALGO))
{
return TNC_RESULT_SUCCESS;
}
/* create an empty out message - we might need it */
out_msg = imv_msg_create(this->agent, state, id, imv_id, TNC_IMCID_ANY,
msg_types[0]);
/* establish the PTS measurements to be taken */
if (!(state->get_action_flags(state) & IMV_ATTESTATION_FLAG_FILE_MEAS))
{
bool is_dir, no_workitems = TRUE;
u_int32_t delimiter = SOLIDUS_UTF;
u_int16_t request_id;
pa_tnc_attr_t *attr;
char *pathname;
attestation_state->set_handshake_state(attestation_state,
IMV_ATTESTATION_STATE_END);
enumerator = session->create_workitem_enumerator(session);
if (enumerator)
{
while (enumerator->enumerate(enumerator, &workitem))
{
if (workitem->get_imv_id(workitem) != TNC_IMVID_ANY)
{
continue;
}
switch (workitem->get_type(workitem))
{
case IMV_WORKITEM_FILE_REF_MEAS:
case IMV_WORKITEM_FILE_MEAS:
case IMV_WORKITEM_FILE_META:
is_dir = FALSE;
break;
case IMV_WORKITEM_DIR_REF_MEAS:
case IMV_WORKITEM_DIR_MEAS:
case IMV_WORKITEM_DIR_META:
is_dir = TRUE;
break;
case IMV_WORKITEM_TPM_ATTEST:
{
pts_component_t *comp;
pts_comp_func_name_t *comp_name;
bool no_d_flag, no_t_flag;
char result_str[BUF_LEN];
workitem->set_imv_id(workitem, imv_id);
no_workitems = FALSE;
no_d_flag = !(pts->get_proto_caps(pts) & PTS_PROTO_CAPS_D);
no_t_flag = !(pts->get_proto_caps(pts) & PTS_PROTO_CAPS_T);
if (no_d_flag || no_t_flag)
{
snprintf(result_str, BUF_LEN, "%s%s%s",
(no_t_flag) ? "no TPM available" : "",
(no_t_flag && no_d_flag) ? ", " : "",
(no_d_flag) ? "no DH nonce negotiation" : "");
eval = TNC_IMV_EVALUATION_RESULT_ERROR;
session->remove_workitem(session, enumerator);
rec = workitem->set_result(workitem, result_str, eval);
state->update_recommendation(state, rec, eval);
imcv_db->finalize_workitem(imcv_db, workitem);
workitem->destroy(workitem);
continue;
}
/* do TPM BIOS measurements */
if (strchr(workitem->get_arg_str(workitem), 'B'))
{
comp_name = pts_comp_func_name_create(PEN_ITA,
PTS_ITA_COMP_FUNC_NAME_IMA,
PTS_ITA_QUALIFIER_FLAG_KERNEL |
PTS_ITA_QUALIFIER_TYPE_TRUSTED);
comp = attestation_state->create_component(
attestation_state, comp_name,
0, this->pts_db);
if (!comp)
{
comp_name->log(comp_name, "unregistered ");
comp_name->destroy(comp_name);
}
}
/* do TPM IMA measurements */
if (strchr(workitem->get_arg_str(workitem), 'I'))
{
comp_name = pts_comp_func_name_create(PEN_ITA,
PTS_ITA_COMP_FUNC_NAME_IMA,
PTS_ITA_QUALIFIER_FLAG_KERNEL |
PTS_ITA_QUALIFIER_TYPE_OS);
comp = attestation_state->create_component(
attestation_state, comp_name,
0, this->pts_db);
if (!comp)
{
comp_name->log(comp_name, "unregistered ");
comp_name->destroy(comp_name);
}
}
attestation_state->set_handshake_state(attestation_state,
IMV_ATTESTATION_STATE_NONCE_REQ);
continue;
}
default:
continue;
}
/* initiate file and directory measurements */
pathname = this->pts_db->get_pathname(this->pts_db, is_dir,
workitem->get_arg_int(workitem));
if (!pathname)
{
continue;
}
workitem->set_imv_id(workitem, imv_id);
no_workitems = FALSE;
if (workitem->get_type(workitem) == IMV_WORKITEM_FILE_META)
{
TNC_IMV_Action_Recommendation rec;
TNC_IMV_Evaluation_Result eval;
char result_str[BUF_LEN];
DBG2(DBG_IMV, "IMV %d requests metadata for %s '%s'",
imv_id, is_dir ? "directory" : "file", pathname);
/* currently just fire and forget metadata requests */
attr = tcg_pts_attr_req_file_meta_create(is_dir,
delimiter, pathname);
snprintf(result_str, BUF_LEN, "%s metadata requested",
is_dir ? "directory" : "file");
eval = TNC_IMV_EVALUATION_RESULT_COMPLIANT;
session->remove_workitem(session, enumerator);
rec = workitem->set_result(workitem, result_str, eval);
state->update_recommendation(state, rec, eval);
imcv_db->finalize_workitem(imcv_db, workitem);
workitem->destroy(workitem);
}
else
{
/* use lower 16 bits of the workitem ID as request ID */
request_id = workitem->get_id(workitem) & 0xffff;
DBG2(DBG_IMV, "IMV %d requests measurement %d for %s '%s'",
imv_id, request_id, is_dir ? "directory" : "file",
pathname);
attr = tcg_pts_attr_req_file_meas_create(is_dir, request_id,
delimiter, pathname);
}
free(pathname);
attr->set_noskip_flag(attr, TRUE);
out_msg->add_attribute(out_msg, attr);
}
enumerator->destroy(enumerator);
/* sent all file and directory measurement and metadata requests */
state->set_action_flags(state, IMV_ATTESTATION_FLAG_FILE_MEAS);
if (no_workitems)
{
DBG2(DBG_IMV, "IMV %d has no workitems - "
"no evaluation requested", imv_id);
state->set_recommendation(state,
TNC_IMV_ACTION_RECOMMENDATION_ALLOW,
TNC_IMV_EVALUATION_RESULT_DONT_KNOW);
}
}
}
/* check the IMV state for the next PA-TNC attributes to send */
enumerator = session->create_workitem_enumerator(session);
while (enumerator->enumerate(enumerator, &workitem))
{
if (workitem->get_type(workitem) == IMV_WORKITEM_TPM_ATTEST)
{
if (!imv_attestation_build(out_msg, state,
this->supported_dh_groups, this->pts_db))
{
imv_reason_string_t *reason_string;
chunk_t result;
char *result_str;
reason_string = imv_reason_string_create("en", ", ");
attestation_state->add_comp_evid_reasons(attestation_state,
reason_string);
result = reason_string->get_encoding(reason_string);
result_str = strndup(result.ptr, result.len);
reason_string->destroy(reason_string);
eval = TNC_IMV_EVALUATION_RESULT_ERROR;
session->remove_workitem(session, enumerator);
rec = workitem->set_result(workitem, result_str, eval);
state->update_recommendation(state, rec, eval);
imcv_db->finalize_workitem(imcv_db, workitem);
}
break;
}
}
enumerator->destroy(enumerator);
/* finalized all workitems? */
if (session && session->get_policy_started(session) &&
session->get_workitem_count(session, imv_id) == 0 &&
attestation_state->get_handshake_state(attestation_state) ==
IMV_ATTESTATION_STATE_END)
{
result = out_msg->send_assessment(out_msg);
out_msg->destroy(out_msg);
state->set_action_flags(state, IMV_ATTESTATION_FLAG_REC);
if (result != TNC_RESULT_SUCCESS)
{
return result;
}
return this->agent->provide_recommendation(this->agent, state);
}
/* send non-empty PA-TNC message with excl flag not set */
if (out_msg->get_attribute_count(out_msg))
{
result = out_msg->send(out_msg, FALSE);
}
out_msg->destroy(out_msg);
return result;
}
METHOD(imv_agent_if_t, solicit_recommendation, TNC_Result,
private_imv_attestation_agent_t *this, TNC_ConnectionID id)
{
TNC_IMVID imv_id;
imv_state_t *state;
imv_attestation_state_t *attestation_state;
imv_session_t *session;
if (!this->agent->get_state(this->agent, id, &state))
{
return TNC_RESULT_FATAL;
}
attestation_state = (imv_attestation_state_t*)state;
session = state->get_session(state);
imv_id = this->agent->get_id(this->agent);
if (session)
{
TNC_IMV_Evaluation_Result eval;
TNC_IMV_Action_Recommendation rec;
imv_workitem_t *workitem;
enumerator_t *enumerator;
char *result_str;
int pending_file_meas = 0;
enumerator = session->create_workitem_enumerator(session);
if (enumerator)
{
while (enumerator->enumerate(enumerator, &workitem))
{
if (workitem->get_imv_id(workitem) != imv_id)
{
continue;
}
switch (workitem->get_type(workitem))
{
case IMV_WORKITEM_FILE_REF_MEAS:
case IMV_WORKITEM_FILE_MEAS:
case IMV_WORKITEM_DIR_REF_MEAS:
case IMV_WORKITEM_DIR_MEAS:
result_str = "Pending file measurements";
pending_file_meas++;
break;
case IMV_WORKITEM_TPM_ATTEST:
attestation_state->finalize_components(attestation_state);
result_str = "Pending component evidence";
break;
default:
continue;
}
session->remove_workitem(session, enumerator);
eval = TNC_IMV_EVALUATION_RESULT_ERROR;
rec = workitem->set_result(workitem, result_str, eval);
state->update_recommendation(state, rec, eval);
imcv_db->finalize_workitem(imcv_db, workitem);
workitem->destroy(workitem);
}
enumerator->destroy(enumerator);
if (pending_file_meas)
{
DBG1(DBG_IMV, "failure due to %d pending file measurements",
pending_file_meas);
attestation_state->set_measurement_error(attestation_state,
IMV_ATTESTATION_ERROR_FILE_MEAS_PEND);
}
}
}
return this->agent->provide_recommendation(this->agent, state);
}
METHOD(imv_agent_if_t, destroy, void,
private_imv_attestation_agent_t *this)
{
if (this->pts_creds)
{
this->pts_credmgr->remove_set(this->pts_credmgr,
this->pts_creds->get_set(this->pts_creds));
this->pts_creds->destroy(this->pts_creds);
}
DESTROY_IF(this->pts_db);
DESTROY_IF(this->pts_credmgr);
DESTROY_IF(this->agent);
free(this);
libpts_deinit();
}
/**
* Described in header.
*/
imv_agent_if_t *imv_attestation_agent_create(const char *name, TNC_IMVID id,
TNC_Version *actual_version)
{
private_imv_attestation_agent_t *this;
imv_agent_t *agent;
char *hash_alg, *dh_group, *cadir;
bool mandatory_dh_groups;
agent = imv_agent_create(name, msg_types, countof(msg_types), id,
actual_version);
if (!agent)
{
return NULL;
}
hash_alg = lib->settings->get_str(lib->settings,
"%s.plugins.imv-attestation.hash_algorithm", "sha256", lib->ns);
dh_group = lib->settings->get_str(lib->settings,
"%s.plugins.imv-attestation.dh_group", "ecp256", lib->ns);
mandatory_dh_groups = lib->settings->get_bool(lib->settings,
"%s.plugins.imv-attestation.mandatory_dh_groups", TRUE, lib->ns);
cadir = lib->settings->get_str(lib->settings,
"%s.plugins.imv-attestation.cadir", NULL, lib->ns);
INIT(this,
.public = {
.bind_functions = _bind_functions,
.notify_connection_change = _notify_connection_change,
.receive_message = _receive_message,
.receive_message_long = _receive_message_long,
.batch_ending = _batch_ending,
.solicit_recommendation = _solicit_recommendation,
.destroy = _destroy,
},
.agent = agent,
.supported_algorithms = PTS_MEAS_ALGO_NONE,
.supported_dh_groups = PTS_DH_GROUP_NONE,
.pts_credmgr = credential_manager_create(),
.pts_creds = pts_creds_create(cadir),
.pts_db = pts_database_create(imcv_db),
);
libpts_init();
if (!pts_meas_algo_probe(&this->supported_algorithms) ||
!pts_dh_group_probe(&this->supported_dh_groups, mandatory_dh_groups) ||
!pts_meas_algo_update(hash_alg, &this->supported_algorithms) ||
!pts_dh_group_update(dh_group, &this->supported_dh_groups))
{
destroy(this);
return NULL;
}
if (this->pts_creds)
{
this->pts_credmgr->add_set(this->pts_credmgr,
this->pts_creds->get_set(this->pts_creds));
}
return &this->public;
}
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