694 lines
19 KiB
C
694 lines
19 KiB
C
/*
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* Copyright (C) 2011 Andreas Steffen, HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "imcv.h"
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#include "imc_agent.h"
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#include <tncif_names.h>
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#include <debug.h>
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#include <utils/linked_list.h>
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#include <threading/rwlock.h>
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typedef struct private_imc_agent_t private_imc_agent_t;
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/**
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* Private data of an imc_agent_t object.
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*/
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struct private_imc_agent_t {
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/**
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* Public members of imc_agent_t
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*/
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imc_agent_t public;
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/**
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* name of IMC
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*/
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const char *name;
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/**
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* message vendor ID of IMC
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*/
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TNC_VendorID vendor_id;
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/**
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* message subtype of IMC
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*/
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TNC_MessageSubtype subtype;
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/**
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* ID of IMC as assigned by TNCC
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*/
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TNC_IMCID id;
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/**
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* List of additional IMC IDs assigned by TNCC
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*/
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linked_list_t *additional_ids;
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/**
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* list of TNCC connection entries
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*/
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linked_list_t *connections;
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/**
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* rwlock to lock TNCC connection entries
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*/
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rwlock_t *connection_lock;
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/**
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* Inform a TNCC about the set of message types the IMC is able to receive
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*
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* @param imc_id IMC ID assigned by TNCC
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* @param supported_types list of supported message types
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* @param type_count number of list elements
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* @return TNC result code
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*/
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TNC_Result (*report_message_types)(TNC_IMCID imc_id,
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TNC_MessageTypeList supported_types,
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TNC_UInt32 type_count);
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/**
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* Inform a TNCC about the set of message types the IMC is able to receive
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*
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* @param imc_id IMC ID assigned by TNCC
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* @param supported_vids list of supported message vendor IDs
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* @param supported_subtypes list of supported message subtypes
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* @param type_count number of list elements
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* @return TNC result code
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*/
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TNC_Result (*report_message_types_long)(TNC_IMCID imc_id,
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TNC_VendorIDList supported_vids,
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TNC_MessageSubtypeList supported_subtypes,
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TNC_UInt32 type_count);
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/**
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* Call when an IMC-IMC message is to be sent
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*
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* @param imc_id IMC ID assigned by TNCC
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* @param connection_id network connection ID assigned by TNCC
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* @param msg message to send
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* @param msg_len message length in bytes
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* @param msg_type message type
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* @return TNC result code
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*/
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TNC_Result (*send_message)(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id,
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TNC_BufferReference msg,
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TNC_UInt32 msg_len,
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TNC_MessageType msg_type);
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/**
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* Call when an IMC-IMC message is to be sent with long message types
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*
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* @param imc_id IMC ID assigned by TNCC
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* @param connection_id network connection ID assigned by TNCC
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* @param msg_flags message flags
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* @param msg message to send
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* @param msg_len message length in bytes
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* @param msg_vid message vendor ID
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* @param msg_subtype message subtype
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* @param dst_imc_id destination IMV ID
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* @return TNC result code
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*/
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TNC_Result (*send_message_long)(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id,
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TNC_UInt32 msg_flags,
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TNC_BufferReference msg,
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TNC_UInt32 msg_len,
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TNC_VendorID msg_vid,
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TNC_MessageSubtype msg_subtype,
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TNC_UInt32 dst_imv_id);
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/**
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* Get the value of an attribute associated with a connection
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* or with the TNCC as a whole.
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*
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* @param imc_id IMC ID assigned by TNCC
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* @param connection_id network connection ID assigned by TNCC
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* @param attribute_id attribute ID
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* @param buffer_len length of buffer in bytes
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* @param buffer buffer
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* @param out_value_len size in bytes of attribute stored in buffer
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* @return TNC result code
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*/
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TNC_Result (*get_attribute)(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id,
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TNC_AttributeID attribute_id,
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TNC_UInt32 buffer_len,
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TNC_BufferReference buffer,
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TNC_UInt32 *out_value_len);
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/**
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* Set the value of an attribute associated with a connection
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* or with the TNCC as a whole.
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*
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* @param imc_id IMV ID assigned by TNCC
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* @param connection_id network connection ID assigned by TNCC
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* @param attribute_id attribute ID
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* @param buffer_len length of buffer in bytes
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* @param buffer buffer
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* @return TNC result code
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*/
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TNC_Result (*set_attribute)(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id,
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TNC_AttributeID attribute_id,
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TNC_UInt32 buffer_len,
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TNC_BufferReference buffer);
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/**
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* Reserve an additional IMC ID
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*
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* @param imc_id primary IMC ID assigned by TNCC
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* @param out_imc_id additional IMC ID assigned by TNCC
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* @return TNC result code
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*/
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TNC_Result (*reserve_additional_id)(TNC_IMCID imc_id,
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TNC_UInt32 *out_imc_id);
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};
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METHOD(imc_agent_t, bind_functions, TNC_Result,
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private_imc_agent_t *this, TNC_TNCC_BindFunctionPointer bind_function)
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{
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if (!bind_function)
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{
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DBG1(DBG_IMC, "TNC client failed to provide bind function");
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return TNC_RESULT_INVALID_PARAMETER;
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}
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if (bind_function(this->id, "TNC_TNCC_ReportMessageTypes",
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(void**)&this->report_message_types) != TNC_RESULT_SUCCESS)
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{
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this->report_message_types = NULL;
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}
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if (bind_function(this->id, "TNC_TNCC_ReportMessageTypesLong",
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(void**)&this->report_message_types_long) != TNC_RESULT_SUCCESS)
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{
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this->report_message_types_long = NULL;
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}
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if (bind_function(this->id, "TNC_TNCC_RequestHandshakeRetry",
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(void**)&this->public.request_handshake_retry) != TNC_RESULT_SUCCESS)
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{
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this->public.request_handshake_retry = NULL;
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}
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if (bind_function(this->id, "TNC_TNCC_SendMessage",
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(void**)&this->send_message) != TNC_RESULT_SUCCESS)
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{
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this->send_message = NULL;
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}
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if (bind_function(this->id, "TNC_TNCC_SendMessageLong",
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(void**)&this->send_message_long) != TNC_RESULT_SUCCESS)
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{
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this->send_message_long = NULL;
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}
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if (bind_function(this->id, "TNC_TNCC_GetAttribute",
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(void**)&this->get_attribute) != TNC_RESULT_SUCCESS)
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{
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this->get_attribute = NULL;
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}
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if (bind_function(this->id, "TNC_TNCC_SetAttribute",
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(void**)&this->set_attribute) != TNC_RESULT_SUCCESS)
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{
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this->set_attribute = NULL;
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}
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if (bind_function(this->id, "TNC_TNCC_ReserveAdditionalIMCID",
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(void**)&this->reserve_additional_id) != TNC_RESULT_SUCCESS)
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{
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this->reserve_additional_id = NULL;
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}
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DBG2(DBG_IMC, "IMC %u \"%s\" provided with bind function",
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this->id, this->name);
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if (this->report_message_types_long)
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{
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this->report_message_types_long(this->id, &this->vendor_id,
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&this->subtype, 1);
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}
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else if (this->report_message_types &&
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this->vendor_id <= TNC_VENDORID_ANY &&
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this->subtype <= TNC_SUBTYPE_ANY)
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{
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TNC_MessageType type;
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type = (this->vendor_id << 8) | this->subtype;
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this->report_message_types(this->id, &type, 1);
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}
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return TNC_RESULT_SUCCESS;
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}
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/**
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* finds a connection state based on its Connection ID
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*/
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static imc_state_t* find_connection(private_imc_agent_t *this,
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TNC_ConnectionID id)
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{
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enumerator_t *enumerator;
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imc_state_t *state, *found = NULL;
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this->connection_lock->read_lock(this->connection_lock);
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enumerator = this->connections->create_enumerator(this->connections);
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while (enumerator->enumerate(enumerator, &state))
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{
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if (id == state->get_connection_id(state))
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{
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found = state;
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break;
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}
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}
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enumerator->destroy(enumerator);
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this->connection_lock->unlock(this->connection_lock);
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return found;
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}
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/**
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* delete a connection state with a given Connection ID
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*/
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static bool delete_connection(private_imc_agent_t *this, TNC_ConnectionID id)
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{
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enumerator_t *enumerator;
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imc_state_t *state;
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bool found = FALSE;
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this->connection_lock->write_lock(this->connection_lock);
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enumerator = this->connections->create_enumerator(this->connections);
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while (enumerator->enumerate(enumerator, &state))
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{
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if (id == state->get_connection_id(state))
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{
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found = TRUE;
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state->destroy(state);
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this->connections->remove_at(this->connections, enumerator);
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break;
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}
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}
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enumerator->destroy(enumerator);
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this->connection_lock->unlock(this->connection_lock);
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return found;
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}
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/**
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* Read a boolean attribute
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*/
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static bool get_bool_attribute(private_imc_agent_t *this, TNC_ConnectionID id,
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TNC_AttributeID attribute_id)
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{
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TNC_UInt32 len;
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char buf[4];
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return this->get_attribute &&
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this->get_attribute(this->id, id, attribute_id, 4, buf, &len) ==
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TNC_RESULT_SUCCESS && len == 1 && *buf == 0x01;
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}
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/**
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* Read a string attribute
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*/
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static char* get_str_attribute(private_imc_agent_t *this, TNC_ConnectionID id,
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TNC_AttributeID attribute_id)
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{
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TNC_UInt32 len;
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char buf[BUF_LEN];
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if (this->get_attribute &&
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this->get_attribute(this->id, id, attribute_id, BUF_LEN, buf, &len) ==
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TNC_RESULT_SUCCESS && len <= BUF_LEN)
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{
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return strdup(buf);
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}
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return NULL;
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}
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METHOD(imc_agent_t, create_state, TNC_Result,
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private_imc_agent_t *this, imc_state_t *state)
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{
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TNC_ConnectionID conn_id;
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char *tnccs_p = NULL, *tnccs_v = NULL, *t_p = NULL, *t_v = NULL;
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bool has_long = FALSE, has_excl = FALSE, has_soh = FALSE;
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conn_id = state->get_connection_id(state);
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if (find_connection(this, conn_id))
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{
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DBG1(DBG_IMC, "IMC %u \"%s\" already created a state for Connection ID %u",
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this->id, this->name, conn_id);
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state->destroy(state);
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return TNC_RESULT_OTHER;
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}
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/* Get and display attributes from TNCC via IF-IMC */
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has_long = get_bool_attribute(this, conn_id, TNC_ATTRIBUTEID_HAS_LONG_TYPES);
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has_excl = get_bool_attribute(this, conn_id, TNC_ATTRIBUTEID_HAS_EXCLUSIVE);
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has_soh = get_bool_attribute(this, conn_id, TNC_ATTRIBUTEID_HAS_SOH);
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tnccs_p = get_str_attribute(this, conn_id, TNC_ATTRIBUTEID_IFTNCCS_PROTOCOL);
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tnccs_v = get_str_attribute(this, conn_id, TNC_ATTRIBUTEID_IFTNCCS_VERSION);
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t_p = get_str_attribute(this, conn_id, TNC_ATTRIBUTEID_IFT_PROTOCOL);
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t_v = get_str_attribute(this, conn_id, TNC_ATTRIBUTEID_IFT_VERSION);
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state->set_flags(state, has_long, has_excl);
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DBG2(DBG_IMC, "IMC %u \"%s\" created a state for Connection ID %u: "
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"%s %s with %slong %sexcl %ssoh over %s %s",
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this->id, this->name, conn_id, tnccs_p ? tnccs_p:"?",
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tnccs_v ? tnccs_v:"?", has_long ? "+":"-", has_excl ? "+":"-",
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has_soh ? "+":"-", t_p ? t_p:"?", t_v ? t_v :"?");
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free(tnccs_p);
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free(tnccs_v);
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free(t_p);
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free(t_v);
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this->connection_lock->write_lock(this->connection_lock);
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this->connections->insert_last(this->connections, state);
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this->connection_lock->unlock(this->connection_lock);
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return TNC_RESULT_SUCCESS;
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}
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METHOD(imc_agent_t, delete_state, TNC_Result,
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private_imc_agent_t *this, TNC_ConnectionID connection_id)
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{
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if (!delete_connection(this, connection_id))
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{
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DBG1(DBG_IMC, "IMC %u \"%s\" has no state for Connection ID %u",
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this->id, this->name, connection_id);
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return TNC_RESULT_FATAL;
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}
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DBG2(DBG_IMC, "IMC %u \"%s\" deleted the state of Connection ID %u",
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this->id, this->name, connection_id);
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return TNC_RESULT_SUCCESS;
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}
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METHOD(imc_agent_t, change_state, TNC_Result,
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private_imc_agent_t *this, TNC_ConnectionID connection_id,
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TNC_ConnectionState new_state,
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imc_state_t **state_p)
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{
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imc_state_t *state;
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switch (new_state)
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{
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case TNC_CONNECTION_STATE_HANDSHAKE:
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case TNC_CONNECTION_STATE_ACCESS_ALLOWED:
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case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
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case TNC_CONNECTION_STATE_ACCESS_NONE:
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state = find_connection(this, connection_id);
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if (!state)
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{
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DBG1(DBG_IMC, "IMC %u \"%s\" has no state for Connection ID %u",
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this->id, this->name, connection_id);
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return TNC_RESULT_FATAL;
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}
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state->change_state(state, new_state);
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DBG2(DBG_IMC, "IMC %u \"%s\" changed state of Connection ID %u to '%N'",
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this->id, this->name, connection_id,
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TNC_Connection_State_names, new_state);
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if (state_p)
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{
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*state_p = state;
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}
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break;
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case TNC_CONNECTION_STATE_CREATE:
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DBG1(DBG_IMC, "state '%N' should be handled by create_state()",
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TNC_Connection_State_names, new_state);
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return TNC_RESULT_FATAL;
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case TNC_CONNECTION_STATE_DELETE:
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DBG1(DBG_IMC, "state '%N' should be handled by delete_state()",
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TNC_Connection_State_names, new_state);
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return TNC_RESULT_FATAL;
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default:
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DBG1(DBG_IMC, "IMC %u \"%s\" was notified of unknown state %u "
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"for Connection ID %u",
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this->id, this->name, new_state, connection_id);
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return TNC_RESULT_INVALID_PARAMETER;
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}
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return TNC_RESULT_SUCCESS;
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}
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METHOD(imc_agent_t, get_state, bool,
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private_imc_agent_t *this, TNC_ConnectionID connection_id,
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imc_state_t **state)
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{
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*state = find_connection(this, connection_id);
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if (!*state)
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{
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DBG1(DBG_IMC, "IMC %u \"%s\" has no state for Connection ID %u",
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this->id, this->name, connection_id);
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return FALSE;
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}
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return TRUE;
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}
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METHOD(imc_agent_t, send_message, TNC_Result,
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private_imc_agent_t *this, TNC_ConnectionID connection_id, bool excl,
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TNC_UInt32 src_imc_id, TNC_UInt32 dst_imv_id, chunk_t msg)
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{
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TNC_MessageType type;
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TNC_UInt32 msg_flags;
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imc_state_t *state;
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state = find_connection(this, connection_id);
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if (!state)
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{
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DBG1(DBG_IMV, "IMC %u \"%s\" has no state for Connection ID %u",
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this->id, this->name, connection_id);
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return TNC_RESULT_FATAL;
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}
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if (state->has_long(state) && this->send_message_long)
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{
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if (!src_imc_id)
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{
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src_imc_id = this->id;
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}
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msg_flags = excl ? TNC_MESSAGE_FLAGS_EXCLUSIVE : 0;
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return this->send_message_long(src_imc_id, connection_id, msg_flags,
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msg.ptr, msg.len, this->vendor_id,
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this->subtype, dst_imv_id);
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}
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if (this->send_message)
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{
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type = (this->vendor_id << 8) | this->subtype;
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return this->send_message(this->id, connection_id, msg.ptr, msg.len,
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type);
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}
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return TNC_RESULT_FATAL;
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}
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METHOD(imc_agent_t, receive_message, TNC_Result,
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private_imc_agent_t *this, imc_state_t *state, chunk_t msg,
|
|
TNC_VendorID msg_vid, TNC_MessageSubtype msg_subtype,
|
|
TNC_UInt32 src_imv_id, TNC_UInt32 dst_imc_id, pa_tnc_msg_t **pa_tnc_msg)
|
|
{
|
|
pa_tnc_msg_t *pa_msg, *error_msg;
|
|
pa_tnc_attr_t *error_attr;
|
|
enumerator_t *enumerator;
|
|
TNC_MessageType msg_type;
|
|
TNC_UInt32 msg_flags, src_imc_id, dst_imv_id;
|
|
TNC_ConnectionID connection_id;
|
|
TNC_Result result;
|
|
|
|
connection_id = state->get_connection_id(state);
|
|
|
|
if (state->has_long(state))
|
|
{
|
|
if (dst_imc_id != TNC_IMCID_ANY)
|
|
{
|
|
DBG2(DBG_IMC, "IMC %u \"%s\" received message for Connection ID %u "
|
|
"from IMV %u to IMC %u", this->id, this->name,
|
|
connection_id, src_imv_id, dst_imc_id);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_IMC, "IMC %u \"%s\" received message for Connection ID %u "
|
|
"from IMV %u", this->id, this->name, connection_id,
|
|
src_imv_id);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_IMC, "IMC %u \"%s\" received message for Connection ID %u",
|
|
this->id, this->name, connection_id);
|
|
}
|
|
|
|
*pa_tnc_msg = NULL;
|
|
pa_msg = pa_tnc_msg_create_from_data(msg);
|
|
|
|
switch (pa_msg->process(pa_msg))
|
|
{
|
|
case SUCCESS:
|
|
*pa_tnc_msg = pa_msg;
|
|
break;
|
|
case VERIFY_ERROR:
|
|
/* build error message */
|
|
error_msg = pa_tnc_msg_create();
|
|
enumerator = pa_msg->create_error_enumerator(pa_msg);
|
|
while (enumerator->enumerate(enumerator, &error_attr))
|
|
{
|
|
error_msg->add_attribute(error_msg,
|
|
error_attr->get_ref(error_attr));
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
error_msg->build(error_msg);
|
|
|
|
/* send error message */
|
|
if (state->has_long(state) && this->send_message_long)
|
|
{
|
|
if (state->has_excl(state))
|
|
{
|
|
msg_flags = TNC_MESSAGE_FLAGS_EXCLUSIVE;
|
|
dst_imv_id = src_imv_id;
|
|
}
|
|
else
|
|
{
|
|
msg_flags = 0;
|
|
dst_imv_id = TNC_IMVID_ANY;
|
|
}
|
|
src_imc_id = (dst_imc_id == TNC_IMCID_ANY) ? this->id
|
|
: dst_imc_id;
|
|
|
|
result = this->send_message_long(src_imc_id, connection_id,
|
|
msg_flags, msg.ptr, msg.len, msg_vid,
|
|
msg_subtype, dst_imv_id);
|
|
}
|
|
else if (this->send_message)
|
|
{
|
|
msg_type = (msg_vid << 8) | msg_subtype;
|
|
|
|
result = this->send_message(this->id, connection_id,
|
|
msg.ptr, msg.len, msg_type);
|
|
}
|
|
else
|
|
{
|
|
result = TNC_RESULT_FATAL;
|
|
}
|
|
|
|
/* clean up */
|
|
error_msg->destroy(error_msg);
|
|
pa_msg->destroy(pa_msg);
|
|
return result;
|
|
case FAILED:
|
|
default:
|
|
pa_msg->destroy(pa_msg);
|
|
return TNC_RESULT_FATAL;
|
|
}
|
|
return TNC_RESULT_SUCCESS;
|
|
}
|
|
|
|
METHOD(imc_agent_t, reserve_additional_ids, TNC_Result,
|
|
private_imc_agent_t *this, int count)
|
|
{
|
|
TNC_Result result;
|
|
TNC_UInt32 id;
|
|
void *pointer;
|
|
|
|
if (!this->reserve_additional_id)
|
|
{
|
|
DBG1(DBG_IMC, "IMC %u \"%s\" did not detect the capability to reserve "
|
|
"additional IMC IDs from the TNCC", this->id, this->name);
|
|
return TNC_RESULT_ILLEGAL_OPERATION;
|
|
}
|
|
while (count > 0)
|
|
{
|
|
result = this->reserve_additional_id(this->id, &id);
|
|
if (result != TNC_RESULT_SUCCESS)
|
|
{
|
|
DBG1(DBG_IMC, "IMC %u \"%s\" failed to reserve %d additional IMC IDs",
|
|
this->id, this->name, count);
|
|
return result;
|
|
}
|
|
count--;
|
|
|
|
/* store the scalar value in the pointer */
|
|
pointer = (void*)id;
|
|
this->additional_ids->insert_last(this->additional_ids, pointer);
|
|
DBG2(DBG_IMC, "IMC %u \"%s\" reserved additional ID %u",
|
|
this->id, this->name, id);
|
|
}
|
|
return TNC_RESULT_SUCCESS;
|
|
}
|
|
|
|
METHOD(imc_agent_t, count_additional_ids, int,
|
|
private_imc_agent_t *this)
|
|
{
|
|
return this->additional_ids->get_count(this->additional_ids);
|
|
}
|
|
|
|
METHOD(imc_agent_t, create_id_enumerator, enumerator_t*,
|
|
private_imc_agent_t *this)
|
|
{
|
|
return this->additional_ids->create_enumerator(this->additional_ids);
|
|
}
|
|
|
|
METHOD(imc_agent_t, destroy, void,
|
|
private_imc_agent_t *this)
|
|
{
|
|
DBG1(DBG_IMC, "IMC %u \"%s\" terminated", this->id, this->name);
|
|
this->additional_ids->destroy(this->additional_ids);
|
|
this->connections->destroy_function(this->connections, free);
|
|
this->connection_lock->destroy(this->connection_lock);
|
|
free(this);
|
|
|
|
/* decrease the reference count or terminate */
|
|
libimcv_deinit();
|
|
}
|
|
|
|
/**
|
|
* Described in header.
|
|
*/
|
|
imc_agent_t *imc_agent_create(const char *name,
|
|
pen_t vendor_id, u_int32_t subtype,
|
|
TNC_IMCID id, TNC_Version *actual_version)
|
|
{
|
|
private_imc_agent_t *this;
|
|
|
|
/* initialize or increase the reference count */
|
|
if (!libimcv_init())
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
INIT(this,
|
|
.public = {
|
|
.bind_functions = _bind_functions,
|
|
.create_state = _create_state,
|
|
.delete_state = _delete_state,
|
|
.change_state = _change_state,
|
|
.get_state = _get_state,
|
|
.send_message = _send_message,
|
|
.receive_message = _receive_message,
|
|
.reserve_additional_ids = _reserve_additional_ids,
|
|
.count_additional_ids = _count_additional_ids,
|
|
.create_id_enumerator = _create_id_enumerator,
|
|
.destroy = _destroy,
|
|
},
|
|
.name = name,
|
|
.vendor_id = vendor_id,
|
|
.subtype = subtype,
|
|
.id = id,
|
|
.additional_ids = linked_list_create(),
|
|
.connections = linked_list_create(),
|
|
.connection_lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
|
|
);
|
|
|
|
*actual_version = TNC_IFIMC_VERSION_1;
|
|
DBG1(DBG_IMC, "IMC %u \"%s\" initialized", this->id, this->name);
|
|
|
|
return &this->public;
|
|
}
|
|
|