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strongswan/src/libimcv/plugins/imv_hcd/imv_hcd_agent.c

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/*
* Copyright (C) 2015 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_hcd_agent.h"
#include "imv_hcd_state.h"
#include <imcv.h>
#include <imv/imv_agent.h>
#include <imv/imv_msg.h>
#include <generic/generic_attr_bool.h>
#include <generic/generic_attr_chunk.h>
#include <generic/generic_attr_string.h>
#include <ietf/ietf_attr.h>
#include <ietf/ietf_attr_attr_request.h>
#include <ietf/ietf_attr_fwd_enabled.h>
#include <pwg/pwg_attr.h>
#include <pwg/pwg_attr_vendor_smi_code.h>
#include "tcg/seg/tcg_seg_attr_max_size.h"
#include "tcg/seg/tcg_seg_attr_seg_env.h"
#include <tncif_names.h>
#include <tncif_pa_subtypes.h>
#include <pen/pen.h>
#include <utils/debug.h>
#define HCD_MAX_ATTR_SIZE 10000000
typedef struct private_imv_hcd_agent_t private_imv_hcd_agent_t;
/* Subscribed PA-TNC message subtypes */
static pen_type_t msg_types[] = {
{ PEN_IETF, PA_SUBTYPE_IETF_OPERATING_SYSTEM },
{ PEN_PWG, PA_SUBTYPE_PWG_HCD_SYSTEM },
{ PEN_PWG, PA_SUBTYPE_PWG_HCD_CONSOLE },
{ PEN_PWG, PA_SUBTYPE_PWG_HCD_MARKER },
{ PEN_PWG, PA_SUBTYPE_PWG_HCD_FINISHER },
{ PEN_PWG, PA_SUBTYPE_PWG_HCD_INTERFACE },
{ PEN_PWG, PA_SUBTYPE_PWG_HCD_SCANNER }
};
static imv_hcd_attr_t attr_type_to_flag(pwg_attr_t attr_type)
{
switch (attr_type)
{
case PWG_HCD_DEFAULT_PWD_ENABLED:
return IMV_HCD_ATTR_DEFAULT_PWD_ENABLED;
case PWG_HCD_FIREWALL_SETTING:
return IMV_HCD_ATTR_FIREWALL_SETTING;
case PWG_HCD_FORWARDING_ENABLED:
return IMV_HCD_ATTR_FORWARDING_ENABLED;
case PWG_HCD_MACHINE_TYPE_MODEL:
return IMV_HCD_ATTR_MACHINE_TYPE_MODEL;
case PWG_HCD_PSTN_FAX_ENABLED:
return IMV_HCD_ATTR_PSTN_FAX_ENABLED;
case PWG_HCD_TIME_SOURCE:
return IMV_HCD_ATTR_TIME_SOURCE;
case PWG_HCD_USER_APP_ENABLED:
return IMV_HCD_ATTR_USER_APP_ENABLED;
case PWG_HCD_USER_APP_PERSIST_ENABLED:
return IMV_HCD_ATTR_USER_APP_PERSIST_ENABLED;
case PWG_HCD_VENDOR_NAME:
return IMV_HCD_ATTR_VENDOR_NAME;
case PWG_HCD_VENDOR_SMI_CODE:
return IMV_HCD_ATTR_VENDOR_SMI_CODE;
case PWG_HCD_CERTIFICATION_STATE:
return IMV_HCD_ATTR_CERTIFICATION_STATE;
case PWG_HCD_CONFIGURATION_STATE:
return IMV_HCD_ATTR_CONFIGURATION_STATE;
case PWG_HCD_ATTRS_NATURAL_LANG:
return IMV_HCD_ATTR_NATURAL_LANG;
case PWG_HCD_FIRMWARE_NAME:
return IMV_HCD_ATTR_FIRMWARE_NAME;
case PWG_HCD_RESIDENT_APP_NAME:
return IMV_HCD_ATTR_RESIDENT_APP_NAME;
case PWG_HCD_USER_APP_NAME:
return IMV_HCD_ATTR_USER_APP_NAME;
default:
return IMV_HCD_ATTR_NONE;
}
}
/**
* Private data of an imv_hcd_agent_t object.
*/
struct private_imv_hcd_agent_t {
/**
* Public members of imv_hcd_agent_t
*/
imv_agent_if_t public;
/**
* IMV agent responsible for generic functions
*/
imv_agent_t *agent;
};
METHOD(imv_agent_if_t, bind_functions, TNC_Result,
private_imv_hcd_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_hcd_agent_t *this, TNC_ConnectionID id,
TNC_ConnectionState new_state)
{
TNC_IMV_Action_Recommendation rec;
imv_state_t *state;
imv_session_t *session;
switch (new_state)
{
case TNC_CONNECTION_STATE_CREATE:
state = imv_hcd_state_create(id);
return this->agent->create_state(this->agent, state);
case TNC_CONNECTION_STATE_DELETE:
return this->agent->delete_state(this->agent, id);
case TNC_CONNECTION_STATE_ACCESS_ALLOWED:
case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
case TNC_CONNECTION_STATE_ACCESS_NONE:
if (this->agent->get_state(this->agent, id, &state) && imcv_db)
{
session = state->get_session(state);
if (session->get_policy_started(session))
{
switch (new_state)
{
case TNC_CONNECTION_STATE_ACCESS_ALLOWED:
rec = TNC_IMV_ACTION_RECOMMENDATION_ALLOW;
break;
case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
rec = TNC_IMV_ACTION_RECOMMENDATION_ISOLATE;
break;
case TNC_CONNECTION_STATE_ACCESS_NONE:
default:
rec = TNC_IMV_ACTION_RECOMMENDATION_NO_ACCESS;
}
imcv_db->add_recommendation(imcv_db, session, rec);
if (!imcv_db->policy_script(imcv_db, session, FALSE))
{
DBG1(DBG_IMV, "error in policy script stop");
}
}
}
/* fall through to default state */
default:
return this->agent->change_state(this->agent, id, new_state, NULL);
}
}
/**
* Process a received message
*/
static TNC_Result receive_msg(private_imv_hcd_agent_t *this, imv_state_t *state,
imv_msg_t *in_msg)
{
imv_msg_t *out_msg;
imv_hcd_state_t *hcd_state;
pa_tnc_attr_t *attr;
enum_name_t *pa_subtype_names;
pen_type_t type, msg_type;
TNC_Result result;
bool fatal_error = FALSE, assessment = FALSE;
enumerator_t *enumerator;
hcd_state = (imv_hcd_state_t*)state;
/* 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;
}
msg_type = in_msg->get_msg_type(in_msg);
pa_subtype_names = get_pa_subtype_names(msg_type.vendor_id);
DBG2(DBG_IMV, "received attributes for PA subtype %N/%N",
pen_names, msg_type.vendor_id, pa_subtype_names, msg_type.type);
/* set current subtype */
if (msg_type.vendor_id == PEN_IETF)
{
hcd_state->set_subtype(hcd_state, PA_SUBTYPE_PWG_HCD_SYSTEM);
}
else
{
hcd_state->set_subtype(hcd_state, msg_type.type);
}
/* 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_FORWARDING_ENABLED:
{
ietf_attr_fwd_enabled_t *attr_cast;
os_fwd_status_t fwd_status;
attr_cast = (ietf_attr_fwd_enabled_t*)attr;
fwd_status = attr_cast->get_status(attr_cast);
DBG2(DBG_IMV, " %N: %N", ietf_attr_names, type.type,
os_fwd_status_names, fwd_status);
state->set_action_flags(state,
IMV_HCD_ATTR_FORWARDING_ENABLED);
break;
}
case IETF_ATTR_FACTORY_DEFAULT_PWD_ENABLED:
{
generic_attr_bool_t *attr_cast;
bool status;
attr_cast = (generic_attr_bool_t*)attr;
status = attr_cast->get_status(attr_cast);
DBG2(DBG_IMV, " %N: %s", ietf_attr_names, type.type,
status ? "yes" : "no");
state->set_action_flags(state,
IMV_HCD_ATTR_DEFAULT_PWD_ENABLED);
break;
}
default:
break;
}
}
else if (type.vendor_id == PEN_PWG)
{
state->set_action_flags(state, attr_type_to_flag(type.type));
switch (type.type)
{
case PWG_HCD_ATTRS_NATURAL_LANG:
case PWG_HCD_MACHINE_TYPE_MODEL:
case PWG_HCD_VENDOR_NAME:
case PWG_HCD_TIME_SOURCE:
case PWG_HCD_FIRMWARE_NAME:
case PWG_HCD_FIRMWARE_STRING_VERSION:
case PWG_HCD_RESIDENT_APP_NAME:
case PWG_HCD_RESIDENT_APP_STRING_VERSION:
case PWG_HCD_USER_APP_NAME:
case PWG_HCD_USER_APP_STRING_VERSION:
{
chunk_t value;
value = attr->get_value(attr);
DBG2(DBG_IMV, " %N: %.*s", pwg_attr_names, type.type,
value.len, value.ptr);
break;
}
case PWG_HCD_FIRMWARE_PATCHES:
case PWG_HCD_RESIDENT_APP_PATCHES:
case PWG_HCD_USER_APP_PATCHES:
{
chunk_t value;
size_t len;
value = attr->get_value(attr);
len = value.len;
/* remove any trailing LF from patches string */
if (len && (value.ptr[len - 1] == '\n'))
{
len--;
}
DBG2(DBG_IMV, " %N:%s%.*s", pwg_attr_names, type.type,
len ? "\n" : " ", len, value.ptr);
break;
}
case PWG_HCD_FIRMWARE_VERSION:
case PWG_HCD_RESIDENT_APP_VERSION:
case PWG_HCD_USER_APP_VERSION:
{
chunk_t value;
value = attr->get_value(attr);
DBG2(DBG_IMV, " %N: %#B", pwg_attr_names, type.type, &value);
break;
}
case PWG_HCD_CERTIFICATION_STATE:
case PWG_HCD_CONFIGURATION_STATE:
{
chunk_t value;
value = attr->get_value(attr);
DBG2(DBG_IMV, " %N: %B", pwg_attr_names, type.type, &value);
break;
}
case PWG_HCD_DEFAULT_PWD_ENABLED:
case PWG_HCD_PSTN_FAX_ENABLED:
case PWG_HCD_USER_APP_ENABLED:
case PWG_HCD_USER_APP_PERSIST_ENABLED:
{
generic_attr_bool_t *attr_cast;
bool status;
attr_cast = (generic_attr_bool_t*)attr;
status = attr_cast->get_status(attr_cast);
DBG2(DBG_IMV, " %N: %s", pwg_attr_names, type.type,
status ? "yes" : "no");
if (type.type == PWG_HCD_USER_APP_ENABLED && !status)
{
/* do not request user applications */
hcd_state->set_user_app_disabled(hcd_state);
}
break;
}
case PWG_HCD_FORWARDING_ENABLED:
{
ietf_attr_fwd_enabled_t *attr_cast;
os_fwd_status_t fwd_status;
attr_cast = (ietf_attr_fwd_enabled_t*)attr;
fwd_status = attr_cast->get_status(attr_cast);
DBG2(DBG_IMV, " %N: %N", pwg_attr_names, type.type,
os_fwd_status_names, fwd_status);
break;
}
case PWG_HCD_VENDOR_SMI_CODE:
{
pwg_attr_vendor_smi_code_t *attr_cast;
uint32_t smi_code;
attr_cast = (pwg_attr_vendor_smi_code_t*)attr;
smi_code = attr_cast->get_vendor_smi_code(attr_cast);
DBG2(DBG_IMV, " %N: 0x%06x (%u)", pwg_attr_names, type.type,
smi_code, smi_code);
break;
}
default:
break;
}
}
}
enumerator->destroy(enumerator);
if (fatal_error)
{
state->set_recommendation(state,
TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
TNC_IMV_EVALUATION_RESULT_ERROR);
assessment = TRUE;
}
if (assessment)
{
hcd_state->set_handshake_state(hcd_state, IMV_HCD_STATE_END);
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_hcd_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_hcd_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;
}
/**
* Build an IETF Attribute Request attribute for missing attributes
*/
static pa_tnc_attr_t* build_attr_request(uint32_t received)
{
pa_tnc_attr_t *attr;
ietf_attr_attr_request_t *attr_cast;
attr = ietf_attr_attr_request_create(PEN_RESERVED, 0);
attr_cast = (ietf_attr_attr_request_t*)attr;
if (!(received & IMV_HCD_ATTR_NATURAL_LANG))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_ATTRS_NATURAL_LANG);
}
if (!(received & IMV_HCD_ATTR_DEFAULT_PWD_ENABLED))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_DEFAULT_PWD_ENABLED);
}
if (!(received & IMV_HCD_ATTR_FIREWALL_SETTING))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_FIREWALL_SETTING);
}
if (!(received & IMV_HCD_ATTR_FIRMWARE_NAME))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_FIRMWARE_NAME);
}
if (!(received & IMV_HCD_ATTR_FORWARDING_ENABLED))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_FORWARDING_ENABLED);
}
if (!(received & IMV_HCD_ATTR_MACHINE_TYPE_MODEL))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_MACHINE_TYPE_MODEL);
}
if (!(received & IMV_HCD_ATTR_PSTN_FAX_ENABLED))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_PSTN_FAX_ENABLED);
}
if (!(received & IMV_HCD_ATTR_RESIDENT_APP_NAME))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_RESIDENT_APP_NAME);
}
if (!(received & IMV_HCD_ATTR_TIME_SOURCE))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_TIME_SOURCE);
}
if (!(received & IMV_HCD_ATTR_USER_APP_ENABLED))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_USER_APP_ENABLED);
}
if (!(received & IMV_HCD_ATTR_USER_APP_PERSIST_ENABLED))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_USER_APP_PERSIST_ENABLED);
}
if (!(received & IMV_HCD_ATTR_USER_APP_NAME))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_USER_APP_NAME);
}
if (!(received & IMV_HCD_ATTR_VENDOR_NAME))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_VENDOR_NAME);
}
if (!(received & IMV_HCD_ATTR_VENDOR_SMI_CODE))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_VENDOR_SMI_CODE);
}
if (!(received & IMV_HCD_ATTR_CERTIFICATION_STATE))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_CERTIFICATION_STATE);
}
if (!(received & IMV_HCD_ATTR_CONFIGURATION_STATE))
{
attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_CONFIGURATION_STATE);
}
return attr;
}
METHOD(imv_agent_if_t, batch_ending, TNC_Result,
private_imv_hcd_agent_t *this, TNC_ConnectionID id)
{
imv_msg_t *out_msg;
imv_state_t *state;
imv_hcd_state_t *hcd_state;
imv_hcd_handshake_state_t handshake_state;
pa_tnc_attr_t *attr;
TNC_IMVID imv_id;
TNC_Result result = TNC_RESULT_SUCCESS;
if (!this->agent->get_state(this->agent, id, &state))
{
return TNC_RESULT_FATAL;
}
hcd_state = (imv_hcd_state_t*)state;
handshake_state = hcd_state->get_handshake_state(hcd_state);
imv_id = this->agent->get_id(this->agent);
if (handshake_state == IMV_HCD_STATE_END)
{
return TNC_RESULT_SUCCESS;
}
if (handshake_state == IMV_HCD_STATE_INIT)
{
size_t max_attr_size = HCD_MAX_ATTR_SIZE;
size_t max_seg_size;
seg_contract_t *contract;
seg_contract_manager_t *contracts;
char buf[BUF_LEN];
uint32_t received;
int i;
/* 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
- PA_TNC_ATTR_HEADER_SIZE
- TCG_SEG_ATTR_MAX_SIZE_SIZE;
contracts = state->get_contracts(state);
for (i = 1; i < countof(msg_types); i++)
{
out_msg = imv_msg_create(this->agent, state, id, imv_id,
TNC_IMCID_ANY, msg_types[i]);
/* Announce support of PA-TNC segmentation to IMC */
contract = seg_contract_create(msg_types[i], 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->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);
hcd_state->set_subtype(hcd_state, msg_types[i].type);
received = state->get_action_flags(state);
if ((received & IMV_HCD_ATTR_MUST) != IMV_HCD_ATTR_MUST)
{
/* create attribute request for missing mandatory attributes */
out_msg->add_attribute(out_msg, build_attr_request(received));
}
result = out_msg->send(out_msg, FALSE);
out_msg->destroy(out_msg);
if (result != TNC_RESULT_SUCCESS)
{
break;
}
}
hcd_state->set_handshake_state(hcd_state, IMV_HCD_STATE_ATTR_REQ);
}
return result;
}
METHOD(imv_agent_if_t, solicit_recommendation, TNC_Result,
private_imv_hcd_agent_t *this, TNC_ConnectionID id)
{
imv_state_t *state;
imv_hcd_state_t* hcd_state;
imv_hcd_handshake_state_t handshake_state;
enum_name_t *pa_subtype_names;
bool missing = FALSE;
uint32_t received;
int i;
if (!this->agent->get_state(this->agent, id, &state))
{
return TNC_RESULT_FATAL;
}
hcd_state = (imv_hcd_state_t*)state;
handshake_state = hcd_state->get_handshake_state(hcd_state);
if (handshake_state == IMV_HCD_STATE_ATTR_REQ)
{
pa_subtype_names = get_pa_subtype_names(PEN_PWG);
for (i = 1; i < countof(msg_types); i++)
{
hcd_state->set_subtype(hcd_state, msg_types[i].type);
received = state->get_action_flags(state);
if ((received & IMV_HCD_ATTR_MUST) != IMV_HCD_ATTR_MUST)
{
DBG1(DBG_IMV, "missing attributes for PA subtype %N/%N",
pen_names, PEN_PWG, pa_subtype_names, msg_types[i].type);
missing = TRUE;
}
}
if (missing)
{
state->set_recommendation(state,
TNC_IMV_ACTION_RECOMMENDATION_NO_ACCESS ,
TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MAJOR);
}
else
{
state->set_recommendation(state,
TNC_IMV_ACTION_RECOMMENDATION_ALLOW ,
TNC_IMV_EVALUATION_RESULT_COMPLIANT);
}
}
hcd_state->set_handshake_state(hcd_state, IMV_HCD_STATE_END);
return this->agent->provide_recommendation(this->agent, state);
}
METHOD(imv_agent_if_t, destroy, void,
private_imv_hcd_agent_t *this)
{
DESTROY_IF(this->agent);
free(this);
}
/**
* Described in header.
*/
imv_agent_if_t *imv_hcd_agent_create(const char *name, TNC_IMVID id,
TNC_Version *actual_version)
{
private_imv_hcd_agent_t *this;
imv_agent_t *agent;
agent = imv_agent_create(name, msg_types, countof(msg_types), id,
actual_version);
if (!agent)
{
return NULL;
}
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,
);
return &this->public;
}
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