570 lines
17 KiB
C
570 lines
17 KiB
C
/**
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* @file responder_init.c
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*
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* @brief Implementation of responder_init_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* 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 "responder_init.h"
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#include <daemon.h>
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#include <sa/states/state.h>
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#include <sa/states/ike_sa_init_responded.h>
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#include <utils/allocator.h>
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#include <encoding/payloads/sa_payload.h>
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#include <encoding/payloads/ke_payload.h>
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#include <encoding/payloads/nonce_payload.h>
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#include <encoding/payloads/notify_payload.h>
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#include <crypto/diffie_hellman.h>
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typedef struct private_responder_init_t private_responder_init_t;
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/**
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* Private data of a responder_init_t object.
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*
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*/
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struct private_responder_init_t {
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/**
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* Methods of the state_t interface.
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*/
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responder_init_t public;
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/**
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* Assigned IKE_SA.
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*/
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protected_ike_sa_t *ike_sa;
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/**
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* Diffie Hellman object used to compute shared secret.
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*/
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diffie_hellman_t *diffie_hellman;
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/**
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* Diffie Hellman group number from selected IKE proposal.
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*/
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u_int16_t dh_group_number;
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/**
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* Priority used to get matching dh_group number.
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*/
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u_int16_t dh_group_priority;
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/**
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* Sent nonce value.
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*
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* This value is passed to the next state of type IKE_SA_INIT_RESPONDED.
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*/
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chunk_t sent_nonce;
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/**
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* Received nonce value
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*
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* This value is passed to the next state of type IKE_SA_INIT_RESPONDED.
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*/
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chunk_t received_nonce;
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/**
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* Selected proposal
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*/
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proposal_t *proposal;
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/**
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* Logger used to log data .
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*
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* Is logger of ike_sa!
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*/
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logger_t *logger;
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/**
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* Handles received SA payload and builds the SA payload for the response.
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*
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* @param this calling object
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* @param sa_request The received SA payload
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* @param response the SA payload is added to this response message_t object.
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* @return
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* - DELETE_ME
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* - SUCCESS
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*/
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status_t (*build_sa_payload) (private_responder_init_t *this,sa_payload_t *sa_request, message_t *response);
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/**
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* Handles received KE payload and builds the KE payload for the response.
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*
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* @param this calling object
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* @param ke_request The received KE payload
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* @param response the KE payload is added to this response message_t object.
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* - DELETE_ME
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* - SUCCESS
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*/
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status_t (*build_ke_payload) (private_responder_init_t *this,ke_payload_t *ke_request, message_t *response);
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/**
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* Handles received NONCE payload and builds the NONCE payload for the response.
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*
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* @param this calling object
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* @param nonce_request The received NONCE payload
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* @param response the NONCE payload is added to this response message_t object.
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* - DELETE_ME
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* - SUCCESS
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*/
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status_t (*build_nonce_payload) (private_responder_init_t *this,nonce_payload_t *nonce_request, message_t *response);
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/**
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* Sends a IKE_SA_INIT reply containing a notify payload.
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*
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* @param this calling object
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* @param notify_payload notify_payload to process
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*/
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status_t (*process_notify_payload) (private_responder_init_t *this, notify_payload_t *notify_payload);
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/**
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* Destroy function called internally of this class after change
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* to state IKE_SA_INIT_RESPONDED succeeded.
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*
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* This destroy function does not destroy objects which were passed to the new state.
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*
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* @param this calling object
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*/
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void (*destroy_after_state_change) (private_responder_init_t *this);
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};
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/**
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* Implementation of state_t.process_message.
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*/
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static status_t process_message(private_responder_init_t *this, message_t *message)
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{
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ike_sa_init_responded_t *next_state;
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chunk_t ike_sa_init_response_data;
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chunk_t ike_sa_init_request_data;
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sa_payload_t *sa_request = NULL;
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ke_payload_t *ke_request = NULL;
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nonce_payload_t *nonce_request = NULL;
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host_t *source, *destination;
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connection_t *connection;
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iterator_t *payloads;
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message_t *response;
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status_t status;
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if (message->get_exchange_type(message) != IKE_SA_INIT)
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{
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this->logger->log(this->logger, ERROR | LEVEL1, "Message of type %s not supported in state responder_init",mapping_find(exchange_type_m,message->get_exchange_type(message)));
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return DELETE_ME;
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}
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if (!message->get_request(message))
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{
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this->logger->log(this->logger, ERROR | LEVEL1, "IKE_SA_INIT responses not allowed state ike_sa_init_responded");
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return DELETE_ME;
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}
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/* this is the first message to process, so get host infos */
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source = message->get_source(message);
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destination = message->get_destination(message);
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connection = charon->connections->get_connection_by_hosts(charon->connections, destination, source);
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if (connection == NULL)
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{
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/* no configuration matches given hosts */
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this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request does not match any available connection. Deleting IKE_SA");
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/* TODO: inform requestor */
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return DELETE_ME;
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}
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this->ike_sa->set_connection(this->ike_sa,connection);
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/* parse incoming message */
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status = message->parse_body(message, NULL, NULL);
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if (status != SUCCESS)
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{
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if (status == NOT_SUPPORTED)
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{
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this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request contains unsupported payload with critical flag set. "
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"Deleting IKE_SA");
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this->ike_sa->send_notify(this->ike_sa, IKE_SA_INIT, UNSUPPORTED_CRITICAL_PAYLOAD, CHUNK_INITIALIZER);
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}
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else
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{
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this->logger->log(this->logger, AUDIT, "Unable to parse IKE_SA_INIT request. Deleting IKE_SA");
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}
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return DELETE_ME;
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}
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payloads = message->get_payload_iterator(message);
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while (payloads->has_next(payloads))
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{
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payload_t *payload;
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payloads->current(payloads, (void**)&payload);
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switch (payload->get_type(payload))
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{
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case SECURITY_ASSOCIATION:
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{
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sa_request = (sa_payload_t*)payload;
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break;
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}
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case KEY_EXCHANGE:
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{
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ke_request = (ke_payload_t*)payload;
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break;
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}
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case NONCE:
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{
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nonce_request = (nonce_payload_t*)payload;
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break;
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}
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case NOTIFY:
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{
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notify_payload_t *notify_payload = (notify_payload_t *) payload;
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status = this->process_notify_payload(this, notify_payload);
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if (status != SUCCESS)
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{
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payloads->destroy(payloads);
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return status;
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}
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}
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default:
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{
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this->logger->log(this->logger, ERROR|LEVEL1, "Ignoring payload %s (%d)",
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mapping_find(payload_type_m, payload->get_type(payload)), payload->get_type(payload));
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break;
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}
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}
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}
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payloads->destroy(payloads);
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/* check if we have all payloads */
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if (!(sa_request && ke_request && nonce_request))
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{
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this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request did not contain all required payloads. Deleting IKE_SA");
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return DELETE_ME;
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}
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this->ike_sa->build_message(this->ike_sa, IKE_SA_INIT, FALSE, &response);
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status = this->build_sa_payload(this, sa_request, response);
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if (status != SUCCESS)
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{
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response->destroy(response);
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return status;
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}
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status = this->build_ke_payload(this, ke_request, response);
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if (status != SUCCESS)
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{
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response->destroy(response);
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return status;
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}
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status = this->build_nonce_payload(this, nonce_request, response);
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if (status != SUCCESS)
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{
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response->destroy(response);
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return status;
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}
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/* derive all the keys used in the IKE_SA */
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status = this->ike_sa->build_transforms(this->ike_sa, this->proposal, this->diffie_hellman, this->received_nonce, this->sent_nonce);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, AUDIT, "Transform objects could not be created from selected proposal. Deleting IKE_SA");
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return DELETE_ME;
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}
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/* message can now be sent (must not be destroyed) */
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status = this->ike_sa->send_response(this->ike_sa, response);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, AUDIT, "Unable to send IKE_SA_INIT response. Deleting IKE_SA");
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response->destroy(response);
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return DELETE_ME;
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}
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/* state can now be changed */
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this->logger->log(this->logger, CONTROL|LEVEL2, "Create next state object of type IKE_SA_INIT_RESPONDED");
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response = this->ike_sa->get_last_responded_message(this->ike_sa);
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ike_sa_init_response_data = response->get_packet_data(response);
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ike_sa_init_request_data = message->get_packet_data(message);
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next_state = ike_sa_init_responded_create(this->ike_sa, this->received_nonce, this->sent_nonce,ike_sa_init_request_data,
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ike_sa_init_response_data);
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/* state can now be changed */
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this->ike_sa->set_new_state(this->ike_sa, (state_t *) next_state);
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this->destroy_after_state_change(this);
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return SUCCESS;
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}
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/**
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* Implementation of private_initiator_init_t.build_sa_payload.
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*/
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static status_t build_sa_payload(private_responder_init_t *this,sa_payload_t *sa_request, message_t *response)
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{
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proposal_t *proposal;
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linked_list_t *proposal_list;
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connection_t *connection;
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sa_payload_t* sa_payload;
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algorithm_t *algo;
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connection = this->ike_sa->get_connection(this->ike_sa);
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this->logger->log(this->logger, CONTROL | LEVEL2, "Process received SA payload");
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/* get the list of suggested proposals */
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proposal_list = sa_request->get_proposals (sa_request);
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/* select proposal */
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this->proposal = connection->select_proposal(connection, proposal_list);
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while(proposal_list->remove_last(proposal_list, (void**)&proposal) == SUCCESS)
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{
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proposal->destroy(proposal);
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}
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proposal_list->destroy(proposal_list);
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if (this->proposal == NULL)
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{
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this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request did not contain any acceptable proposals. Deleting IKE_SA");
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this->ike_sa->send_notify(this->ike_sa, IKE_SA_INIT, NO_PROPOSAL_CHOSEN, CHUNK_INITIALIZER);
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return DELETE_ME;
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}
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/* get selected DH group to force policy, this is very restrictive!? */
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this->proposal->get_algorithm(this->proposal, PROTO_IKE, DIFFIE_HELLMAN_GROUP, &algo);
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this->dh_group_number = algo->algorithm;
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this->logger->log(this->logger, CONTROL | LEVEL2, "SA Payload processed");
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this->logger->log(this->logger, CONTROL|LEVEL2, "Building SA payload");
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sa_payload = sa_payload_create_from_proposal(this->proposal);
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this->logger->log(this->logger, CONTROL|LEVEL2, "add SA payload to message");
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response->add_payload(response,(payload_t *) sa_payload);
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return SUCCESS;
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}
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/**
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* Implementation of private_initiator_init_t.build_ke_payload.
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*/
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static status_t build_ke_payload(private_responder_init_t *this,ke_payload_t *ke_request, message_t *response)
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{
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diffie_hellman_group_t group;
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ke_payload_t *ke_payload;
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diffie_hellman_t *dh;
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chunk_t key_data;
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this->logger->log(this->logger, CONTROL | LEVEL2, "Process received KE payload");
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group = ke_request->get_dh_group_number(ke_request);
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if (group == MODP_UNDEFINED)
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{
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this->logger->log(this->logger, AUDIT, "No diffie hellman group to select. Deleting IKE_SA");
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return DELETE_ME;
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}
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if (this->dh_group_number != group)
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{
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u_int16_t accepted_group;
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chunk_t accepted_group_chunk;
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/* group not same as selected one
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* Maybe key exchange payload is before SA payload */
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this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request did not contain a acceptable diffie hellman group. Deleting IKE_SA");
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accepted_group = htons(this->dh_group_number);
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accepted_group_chunk.ptr = (u_int8_t*) &(accepted_group);
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accepted_group_chunk.len = 2;
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this->ike_sa->send_notify(this->ike_sa,IKE_SA_INIT,INVALID_KE_PAYLOAD,accepted_group_chunk);
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return DELETE_ME;
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}
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/* create diffie hellman object to handle DH exchange */
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dh = diffie_hellman_create(group);
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if (dh == NULL)
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{
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this->logger->log(this->logger, AUDIT, "Could not generate DH object with group %d. Deleting IKE_SA",
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mapping_find(diffie_hellman_group_m,group) );
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return DELETE_ME;
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}
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this->logger->log(this->logger, CONTROL | LEVEL2, "Set other DH public value");
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dh->set_other_public_value(dh, ke_request->get_key_exchange_data(ke_request));
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this->diffie_hellman = dh;
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this->logger->log(this->logger, CONTROL | LEVEL2, "KE Payload processed.");
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this->logger->log(this->logger, CONTROL|LEVEL2, "Building KE payload");
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this->diffie_hellman->get_my_public_value(this->diffie_hellman,&key_data);
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ke_payload = ke_payload_create();
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ke_payload->set_key_exchange_data(ke_payload,key_data);
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ke_payload->set_dh_group_number(ke_payload, this->dh_group_number);
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allocator_free_chunk(&key_data);
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this->logger->log(this->logger, CONTROL|LEVEL2, "Add KE payload to message");
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response->add_payload(response,(payload_t *) ke_payload);
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return SUCCESS;
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}
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/**
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* Implementation of private_responder_init_t.build_nonce_payload.
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*/
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static status_t build_nonce_payload(private_responder_init_t *this,nonce_payload_t *nonce_request, message_t *response)
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{
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nonce_payload_t *nonce_payload;
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randomizer_t *randomizer;
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status_t status;
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this->logger->log(this->logger, CONTROL | LEVEL2, "Process received NONCE payload");
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allocator_free(this->received_nonce.ptr);
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this->received_nonce = CHUNK_INITIALIZER;
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this->logger->log(this->logger, CONTROL | LEVEL2, "Get NONCE value and store it");
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this->received_nonce = nonce_request->get_nonce(nonce_request);
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this->logger->log(this->logger, CONTROL | LEVEL2, "Create new NONCE value.");
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randomizer = this->ike_sa->get_randomizer(this->ike_sa);
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status = randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_SIZE, &(this->sent_nonce));
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if (status != SUCCESS)
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{
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return status;
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}
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this->logger->log(this->logger, CONTROL|LEVEL2, "Building NONCE payload");
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nonce_payload = nonce_payload_create();
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nonce_payload->set_nonce(nonce_payload, this->sent_nonce);
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this->logger->log(this->logger, CONTROL|LEVEL2, "Add NONCE payload to message");
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response->add_payload(response,(payload_t *) nonce_payload);
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return SUCCESS;
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}
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/**
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* Implementation of private_responder_init_t.process_notify_payload.
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*/
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static status_t process_notify_payload(private_responder_init_t *this, notify_payload_t *notify_payload)
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{
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notify_message_type_t notify_message_type = notify_payload->get_notify_message_type(notify_payload);
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this->logger->log(this->logger, CONTROL|LEVEL1, "Process notify type %s",
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mapping_find(notify_message_type_m, notify_message_type));
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if (notify_payload->get_protocol_id(notify_payload) != PROTO_IKE)
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{
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this->logger->log(this->logger, ERROR | LEVEL1, "Notify reply not for IKE protocol.");
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return FAILED;
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}
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switch (notify_message_type)
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{
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default:
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{
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this->logger->log(this->logger, CONTROL, "IKE_SA_INIT request contained a notify (%d), ignored.",
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notify_message_type);
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return SUCCESS;
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}
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}
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}
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/**
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* Implementation of state_t.get_state.
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*/
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static ike_sa_state_t get_state(private_responder_init_t *this)
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{
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return RESPONDER_INIT;
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}
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|
/**
|
|
* Implementation of state_t.destroy.
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|
*/
|
|
static void destroy(private_responder_init_t *this)
|
|
{
|
|
this->logger->log(this->logger, CONTROL | LEVEL1, "Going to destroy responder init state object");
|
|
|
|
this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy sent nonce");
|
|
allocator_free_chunk(&(this->sent_nonce));
|
|
this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy received nonce");
|
|
allocator_free_chunk(&(this->received_nonce));
|
|
|
|
if (this->diffie_hellman != NULL)
|
|
{
|
|
this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy diffie_hellman_t hellman object");
|
|
this->diffie_hellman->destroy(this->diffie_hellman);
|
|
}
|
|
if (this->proposal)
|
|
{
|
|
this->proposal->destroy(this->proposal);
|
|
}
|
|
this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy object");
|
|
allocator_free(this);
|
|
}
|
|
|
|
/**
|
|
* Implementation of private_responder_init_t.destroy_after_state_change
|
|
*/
|
|
static void destroy_after_state_change (private_responder_init_t *this)
|
|
{
|
|
this->logger->log(this->logger, CONTROL | LEVEL1, "Going to destroy responder_init_t state object");
|
|
|
|
/* destroy diffie hellman object */
|
|
if (this->diffie_hellman != NULL)
|
|
{
|
|
this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy diffie_hellman_t object");
|
|
this->diffie_hellman->destroy(this->diffie_hellman);
|
|
}
|
|
if (this->proposal)
|
|
{
|
|
this->proposal->destroy(this->proposal);
|
|
}
|
|
|
|
this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy object");
|
|
allocator_free(this);
|
|
}
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
responder_init_t *responder_init_create(protected_ike_sa_t *ike_sa)
|
|
{
|
|
private_responder_init_t *this = allocator_alloc_thing(private_responder_init_t);
|
|
|
|
/* interface functions */
|
|
this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *)) process_message;
|
|
this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
|
|
this->public.state_interface.destroy = (void (*) (state_t *)) destroy;
|
|
|
|
/* private functions */
|
|
this->build_sa_payload = build_sa_payload;
|
|
this->build_ke_payload = build_ke_payload;
|
|
this->build_nonce_payload = build_nonce_payload;
|
|
this->destroy_after_state_change = destroy_after_state_change;
|
|
this->process_notify_payload = process_notify_payload;
|
|
|
|
/* private data */
|
|
this->ike_sa = ike_sa;
|
|
this->logger = charon->logger_manager->get_logger(charon->logger_manager, IKE_SA);
|
|
this->sent_nonce = CHUNK_INITIALIZER;
|
|
this->received_nonce = CHUNK_INITIALIZER;
|
|
this->dh_group_number = MODP_UNDEFINED;
|
|
this->diffie_hellman = NULL;
|
|
this->proposal = NULL;
|
|
|
|
return &(this->public);
|
|
}
|