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strongswan/src/libimcv/plugins/imv_swid/imv_swid_agent.c

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/*
* Copyright (C) 2013-2017 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
#include <stdio.h>
#include "imv_swid_agent.h"
#include "imv_swid_state.h"
#include <imcv.h>
#include <imv/imv_agent.h>
#include <imv/imv_msg.h>
#include <ietf/ietf_attr_pa_tnc_error.h>
#include "rest/rest.h"
#include "tcg/seg/tcg_seg_attr_max_size.h"
#include "tcg/seg/tcg_seg_attr_seg_env.h"
#include "tcg/swid/tcg_swid_attr_req.h"
#include "tcg/swid/tcg_swid_attr_tag_inv.h"
#include "tcg/swid/tcg_swid_attr_tag_id_inv.h"
#include "swid/swid_error.h"
#include "swid/swid_inventory.h"
#include <tncif_names.h>
#include <tncif_pa_subtypes.h>
#include <pen/pen.h>
#include <utils/debug.h>
#include <bio/bio_reader.h>
typedef struct private_imv_swid_agent_t private_imv_swid_agent_t;
/* Subscribed PA-TNC message subtypes */
static pen_type_t msg_types[] = {
{ PEN_TCG, PA_SUBTYPE_TCG_SWID }
};
/**
* Flag set when corresponding attribute has been received
*/
enum imv_swid_attr_t {
IMV_SWID_ATTR_TAG_INV = (1<<0),
IMV_SWID_ATTR_TAG_ID_INV = (1<<1)
};
/**
* Private data of an imv_swid_agent_t object.
*/
struct private_imv_swid_agent_t {
/**
* Public members of imv_swid_agent_t
*/
imv_agent_if_t public;
/**
* IMV agent responsible for generic functions
*/
imv_agent_t *agent;
/**
* REST API to strongTNC manager
*/
rest_t *rest_api;
};
METHOD(imv_agent_if_t, bind_functions, TNC_Result,
private_imv_swid_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_swid_agent_t *this, TNC_ConnectionID id,
TNC_ConnectionState new_state)
{
imv_state_t *state;
switch (new_state)
{
case TNC_CONNECTION_STATE_CREATE:
state = imv_swid_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_swid_agent_t *this,
imv_state_t *state, imv_msg_t *in_msg)
{
imv_swid_state_t *swid_state;
imv_msg_t *out_msg;
enumerator_t *enumerator;
pa_tnc_attr_t *attr;
TNC_Result result;
bool fatal_error = FALSE;
/* generate an outgoing PA-TNC message - we might need it */
out_msg = imv_msg_create_as_reply(in_msg);
/* parse received PA-TNC message and handle local and remote errors */
result = in_msg->receive(in_msg, out_msg, &fatal_error);
if (result != TNC_RESULT_SUCCESS)
{
out_msg->destroy(out_msg);
return result;
}
swid_state = (imv_swid_state_t*)state;
/* analyze PA-TNC attributes */
enumerator = in_msg->create_attribute_enumerator(in_msg);
while (enumerator->enumerate(enumerator, &attr))
{
uint32_t request_id = 0, last_eid, eid_epoch;
swid_inventory_t *inventory;
pen_type_t type;
type = attr->get_type(attr);
if (type.vendor_id == PEN_IETF && type.type == IETF_ATTR_PA_TNC_ERROR)
{
ietf_attr_pa_tnc_error_t *error_attr;
pen_type_t error_code;
chunk_t msg_info, description;
bio_reader_t *reader;
uint32_t max_attr_size;
bool success;
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)
{
fatal_error = TRUE;
msg_info = error_attr->get_msg_info(error_attr);
reader = bio_reader_create(msg_info);
success = reader->read_uint32(reader, &request_id);
DBG1(DBG_IMV, "received TCG error '%N' for request %d",
swid_error_code_names, error_code.type, request_id);
if (!success)
{
reader->destroy(reader);
continue;
}
if (error_code.type == TCG_SWID_RESPONSE_TOO_LARGE)
{
if (!reader->read_uint32(reader, &max_attr_size))
{
reader->destroy(reader);
continue;
}
DBG1(DBG_IMV, " maximum PA-TNC attribute size is %u bytes",
max_attr_size);
}
description = reader->peek(reader);
if (description.len)
{
DBG1(DBG_IMV, " description: %.*s", description.len,
description.ptr);
}
reader->destroy(reader);
}
}
else if (type.vendor_id != PEN_TCG)
{
continue;
}
switch (type.type)
{
case TCG_SWID_TAG_ID_INVENTORY:
{
tcg_swid_attr_tag_id_inv_t *attr_cast;
uint32_t missing;
int tag_id_count;
state->set_action_flags(state, IMV_SWID_ATTR_TAG_ID_INV);
attr_cast = (tcg_swid_attr_tag_id_inv_t*)attr;
request_id = attr_cast->get_request_id(attr_cast);
last_eid = attr_cast->get_last_eid(attr_cast, &eid_epoch);
inventory = attr_cast->get_inventory(attr_cast);
tag_id_count = inventory->get_count(inventory);
missing = attr_cast->get_tag_id_count(attr_cast);
swid_state->set_missing(swid_state, missing);
DBG2(DBG_IMV, "received SWID tag ID inventory with %d item%s "
"for request %d at eid %d of epoch 0x%08x, %d item%s to "
"follow", tag_id_count, (tag_id_count == 1) ? "" : "s",
request_id, last_eid, eid_epoch, missing,
(missing == 1) ? "" : "s");
if (request_id == swid_state->get_request_id(swid_state))
{
swid_state->set_swid_inventory(swid_state, inventory);
swid_state->set_count(swid_state, tag_id_count, 0,
in_msg->get_src_id(in_msg));
}
else
{
DBG1(DBG_IMV, "no workitem found for SWID tag ID inventory "
"with request ID %d", request_id);
}
attr_cast->clear_inventory(attr_cast);
break;
}
case TCG_SWID_TAG_INVENTORY:
{
tcg_swid_attr_tag_inv_t *attr_cast;
swid_tag_t *tag;
chunk_t tag_encoding;
json_object *jobj, *jarray, *jstring;
char *tag_str;
uint32_t missing;
int tag_count;
enumerator_t *e;
state->set_action_flags(state, IMV_SWID_ATTR_TAG_INV);
attr_cast = (tcg_swid_attr_tag_inv_t*)attr;
request_id = attr_cast->get_request_id(attr_cast);
last_eid = attr_cast->get_last_eid(attr_cast, &eid_epoch);
inventory = attr_cast->get_inventory(attr_cast);
tag_count = inventory->get_count(inventory);
missing = attr_cast->get_tag_count(attr_cast);
swid_state->set_missing(swid_state, missing);
DBG2(DBG_IMV, "received SWID tag inventory with %d item%s for "
"request %d at eid %d of epoch 0x%08x, %d item%s to follow",
tag_count, (tag_count == 1) ? "" : "s", request_id,
last_eid, eid_epoch, missing, (missing == 1) ? "" : "s");
if (request_id == swid_state->get_request_id(swid_state))
{
swid_state->set_count(swid_state, 0, tag_count,
in_msg->get_src_id(in_msg));
if (this->rest_api)
{
jobj = json_object_new_object();
jarray = json_object_new_array();
json_object_object_add(jobj, "data", jarray);
e = inventory->create_enumerator(inventory);
while (e->enumerate(e, &tag))
{
tag_encoding = tag->get_encoding(tag);
tag_str = strndup(tag_encoding.ptr, tag_encoding.len);
DBG3(DBG_IMV, "%s", tag_str);
jstring = json_object_new_string(tag_str);
json_object_array_add(jarray, jstring);
free(tag_str);
}
e->destroy(e);
if (this->rest_api->post(this->rest_api,
"swid/add-tags/", jobj, NULL) != SUCCESS)
{
DBG1(DBG_IMV, "error in REST API add-tags request");
}
json_object_put(jobj);
}
}
else
{
DBG1(DBG_IMV, "no workitem found for SWID tag inventory "
"with request ID %d", request_id);
}
attr_cast->clear_inventory(attr_cast);
break;
}
default:
break;
}
}
enumerator->destroy(enumerator);
if (fatal_error)
{
state->set_recommendation(state,
TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
TNC_IMV_EVALUATION_RESULT_ERROR);
result = out_msg->send_assessment(out_msg);
if (result == TNC_RESULT_SUCCESS)
{
result = this->agent->provide_recommendation(this->agent, state);
}
}
else
{
/* send PA-TNC message with the 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_swid_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_swid_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_swid_agent_t *this, TNC_ConnectionID id)
{
imv_msg_t *out_msg;
imv_state_t *state;
imv_session_t *session;
imv_workitem_t *workitem;
imv_swid_state_t *swid_state;
imv_swid_handshake_state_t handshake_state;
pa_tnc_attr_t *attr;
TNC_IMVID imv_id;
TNC_Result result = TNC_RESULT_SUCCESS;
bool no_workitems = TRUE;
uint32_t request_id, received;
uint8_t flags;
enumerator_t *enumerator;
if (!this->agent->get_state(this->agent, id, &state))
{
return TNC_RESULT_FATAL;
}
swid_state = (imv_swid_state_t*)state;
handshake_state = swid_state->get_handshake_state(swid_state);
session = state->get_session(state);
imv_id = this->agent->get_id(this->agent);
if (handshake_state == IMV_SWID_STATE_END)
{
return TNC_RESULT_SUCCESS;
}
/* Create an empty out message - we might need it */
out_msg = imv_msg_create(this->agent, state, id, imv_id,
swid_state->get_imc_id(swid_state),
msg_types[0]);
if (!imcv_db)
{
DBG2(DBG_IMV, "no workitems available - no evaluation possible");
state->set_recommendation(state,
TNC_IMV_ACTION_RECOMMENDATION_ALLOW,
TNC_IMV_EVALUATION_RESULT_DONT_KNOW);
result = out_msg->send_assessment(out_msg);
out_msg->destroy(out_msg);
swid_state->set_handshake_state(swid_state, IMV_SWID_STATE_END);
if (result != TNC_RESULT_SUCCESS)
{
return result;
}
return this->agent->provide_recommendation(this->agent, state);
}
/* Look for SWID tag workitem and create SWID tag request */
if (handshake_state == IMV_SWID_STATE_INIT &&
session->get_policy_started(session))
{
size_t max_attr_size = SWID_MAX_ATTR_SIZE;
size_t max_seg_size;
seg_contract_t *contract;
seg_contract_manager_t *contracts;
char buf[BUF_LEN];
enumerator = session->create_workitem_enumerator(session);
if (enumerator)
{
while (enumerator->enumerate(enumerator, &workitem))
{
if (workitem->get_imv_id(workitem) != TNC_IMVID_ANY ||
workitem->get_type(workitem) != IMV_WORKITEM_SWID_TAGS)
{
continue;
}
flags = TCG_SWID_ATTR_REQ_FLAG_NONE;
if (strchr(workitem->get_arg_str(workitem), 'R'))
{
flags |= TCG_SWID_ATTR_REQ_FLAG_R;
}
if (strchr(workitem->get_arg_str(workitem), 'S'))
{
flags |= TCG_SWID_ATTR_REQ_FLAG_S;
}
if (strchr(workitem->get_arg_str(workitem), 'C'))
{
flags |= TCG_SWID_ATTR_REQ_FLAG_C;
}
/* Determine maximum PA-TNC attribute segment size */
max_seg_size = state->get_max_msg_len(state)
- PA_TNC_HEADER_SIZE
- PA_TNC_ATTR_HEADER_SIZE
- TCG_SEG_ATTR_SEG_ENV_HEADER;
/* Announce support of PA-TNC segmentation to IMC */
contract = seg_contract_create(msg_types[0], max_attr_size,
max_seg_size, TRUE, imv_id, FALSE);
contract->get_info_string(contract, buf, BUF_LEN, TRUE);
DBG2(DBG_IMV, "%s", buf);
contracts = state->get_contracts(state);
contracts->add_contract(contracts, contract);
attr = tcg_seg_attr_max_size_create(max_attr_size,
max_seg_size, TRUE);
out_msg->add_attribute(out_msg, attr);
/* Issue a SWID request */
request_id = workitem->get_id(workitem);
swid_state->set_request_id(swid_state, request_id);
attr = tcg_swid_attr_req_create(flags, request_id, 0);
out_msg->add_attribute(out_msg, attr);
workitem->set_imv_id(workitem, imv_id);
no_workitems = FALSE;
DBG2(DBG_IMV, "IMV %d issues SWID request %d",
imv_id, request_id);
break;
}
enumerator->destroy(enumerator);
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);
}
handshake_state = IMV_SWID_STATE_WORKITEMS;
swid_state->set_handshake_state(swid_state, handshake_state);
}
}
received = state->get_action_flags(state);
if (handshake_state == IMV_SWID_STATE_WORKITEMS &&
(received & (IMV_SWID_ATTR_TAG_INV|IMV_SWID_ATTR_TAG_ID_INV)) &&
swid_state->get_missing(swid_state) == 0)
{
TNC_IMV_Evaluation_Result eval;
TNC_IMV_Action_Recommendation rec;
char result_str[BUF_LEN], *error_str = "", *command;
char *target, *separator;
int tag_id_count, tag_count, i;
chunk_t tag_creator, unique_sw_id;
json_object *jrequest, *jresponse, *jvalue;
tcg_swid_attr_req_t *cast_attr;
swid_tag_id_t *tag_id;
status_t status = SUCCESS;
if (this->rest_api && (received & IMV_SWID_ATTR_TAG_ID_INV))
{
if (asprintf(&command, "sessions/%d/swid-measurement/",
session->get_session_id(session, NULL, NULL)) < 0)
{
error_str = "allocation of command string failed";
status = FAILED;
}
else
{
jrequest = swid_state->get_swid_inventory(swid_state);
status = this->rest_api->post(this->rest_api, command,
jrequest, &jresponse);
if (status == FAILED)
{
error_str = "error in REST API swid-measurement request";
}
free(command);
}
}
switch (status)
{
case SUCCESS:
enumerator = session->create_workitem_enumerator(session);
while (enumerator->enumerate(enumerator, &workitem))
{
if (workitem->get_type(workitem) == IMV_WORKITEM_SWID_TAGS)
{
swid_state->get_count(swid_state, &tag_id_count,
&tag_count);
snprintf(result_str, BUF_LEN, "received inventory of "
"%d SWID tag ID%s and %d SWID tag%s",
tag_id_count, (tag_id_count == 1) ? "" : "s",
tag_count, (tag_count == 1) ? "" : "s");
session->remove_workitem(session, enumerator);
eval = TNC_IMV_EVALUATION_RESULT_COMPLIANT;
rec = workitem->set_result(workitem, result_str, eval);
state->update_recommendation(state, rec, eval);
imcv_db->finalize_workitem(imcv_db, workitem);
workitem->destroy(workitem);
break;
}
}
enumerator->destroy(enumerator);
break;
case NEED_MORE:
if (received & IMV_SWID_ATTR_TAG_INV)
{
error_str = "not all requested SWID tags were received";
status = FAILED;
json_object_put(jresponse);
break;
}
if (json_object_get_type(jresponse) != json_type_array)
{
error_str = "response was not a json_array";
status = FAILED;
json_object_put(jresponse);
break;
}
/* Create a TCG SWID Request attribute */
attr = tcg_swid_attr_req_create(TCG_SWID_ATTR_REQ_FLAG_NONE,
swid_state->get_request_id(swid_state), 0);
tag_id_count = json_object_array_length(jresponse);
DBG1(DBG_IMV, "%d SWID tag target%s", tag_id_count,
(tag_id_count == 1) ? "" : "s");
swid_state->set_missing(swid_state, tag_id_count);
for (i = 0; i < tag_id_count; i++)
{
jvalue = json_object_array_get_idx(jresponse, i);
if (json_object_get_type(jvalue) != json_type_string)
{
error_str = "json_string element expected in json_array";
status = FAILED;
json_object_put(jresponse);
break;
}
target = (char*)json_object_get_string(jvalue);
DBG1(DBG_IMV, " %s", target);
/* Separate target into tag_creator and unique_sw_id */
separator = strstr(target, "__");
if (!separator)
{
error_str = "separation of regid from "
"unique software ID failed";
break;
}
tag_creator = chunk_create(target, separator - target);
separator += 2;
unique_sw_id = chunk_create(separator, strlen(target) -
tag_creator.len - 2);
tag_id = swid_tag_id_create(tag_creator, unique_sw_id,
chunk_empty);
cast_attr = (tcg_swid_attr_req_t*)attr;
cast_attr->add_target(cast_attr, tag_id);
}
json_object_put(jresponse);
out_msg->add_attribute(out_msg, attr);
break;
case FAILED:
default:
break;
}
if (status == FAILED)
{
enumerator = session->create_workitem_enumerator(session);
while (enumerator->enumerate(enumerator, &workitem))
{
if (workitem->get_type(workitem) == IMV_WORKITEM_SWID_TAGS)
{
session->remove_workitem(session, enumerator);
eval = TNC_IMV_EVALUATION_RESULT_ERROR;
rec = workitem->set_result(workitem, error_str, eval);
state->update_recommendation(state, rec, eval);
imcv_db->finalize_workitem(imcv_db, workitem);
workitem->destroy(workitem);
break;
}
}
enumerator->destroy(enumerator);
}
}
/* finalized all workitems ? */
if (handshake_state == IMV_SWID_STATE_WORKITEMS &&
session->get_workitem_count(session, imv_id) == 0)
{
result = out_msg->send_assessment(out_msg);
out_msg->destroy(out_msg);
swid_state->set_handshake_state(swid_state, IMV_SWID_STATE_END);
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_swid_agent_t *this, TNC_ConnectionID id)
{
imv_state_t *state;
if (!this->agent->get_state(this->agent, id, &state))
{
return TNC_RESULT_FATAL;
}
return this->agent->provide_recommendation(this->agent, state);
}
METHOD(imv_agent_if_t, destroy, void,
private_imv_swid_agent_t *this)
{
DESTROY_IF(this->rest_api);
this->agent->destroy(this->agent);
free(this);
}
/**
* Described in header.
*/
imv_agent_if_t *imv_swid_agent_create(const char *name, TNC_IMVID id,
TNC_Version *actual_version)
{
private_imv_swid_agent_t *this;
imv_agent_t *agent;
char *rest_api_uri;
u_int rest_api_timeout;
agent = imv_agent_create(name, msg_types, countof(msg_types), id,
actual_version);
if (!agent)
{
return NULL;
}
agent->add_non_fatal_attr_type(agent,
pen_type_create(PEN_TCG, TCG_SEG_MAX_ATTR_SIZE_REQ));
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,
);
rest_api_uri = lib->settings->get_str(lib->settings,
"%s.plugins.imv-swid.rest_api_uri", NULL, lib->ns);
rest_api_timeout = lib->settings->get_int(lib->settings,
"%s.plugins.imv-swid.rest_api_timeout", 120, lib->ns);
if (rest_api_uri)
{
this->rest_api = rest_create(rest_api_uri, rest_api_timeout);
}
return &this->public;
}
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