605 lines
19 KiB
C
605 lines
19 KiB
C
/**
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* @file ike_sa_init_responded.c
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*
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* @brief State of a IKE_SA after responding to an IKE_SA_INIT request
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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 "ike_sa_init_responded.h"
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#include <daemon.h>
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#include <utils/allocator.h>
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#include <sa/authenticator.h>
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#include <encoding/payloads/ts_payload.h>
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#include <encoding/payloads/sa_payload.h>
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#include <encoding/payloads/id_payload.h>
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#include <encoding/payloads/auth_payload.h>
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#include <encoding/payloads/notify_payload.h>
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#include <transforms/signers/signer.h>
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#include <transforms/crypters/crypter.h>
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#include <sa/states/ike_sa_established.h>
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typedef struct private_ike_sa_init_responded_t private_ike_sa_init_responded_t;
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/**
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* Private data of a ike_sa_init_responded_t object.
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*
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*/
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struct private_ike_sa_init_responded_t {
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/**
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* Public interface of ike_sa_init_responded_t.
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*/
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ike_sa_init_responded_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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* Received nonce.
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*/
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chunk_t received_nonce;
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/**
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* Sent nonce.
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*/
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chunk_t sent_nonce;
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/**
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* Binary representation of the IKE_SA_INIT response.
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*/
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chunk_t ike_sa_init_response_data;
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/**
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* Binary representation of the IKE_SA_INIT request.
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*/
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chunk_t ike_sa_init_request_data;
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/**
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* SA config to use.
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*/
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sa_config_t *sa_config;
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/**
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* Assigned logger.
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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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* Process received IDi and IDr payload and build IDr payload for IKE_AUTH response.
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*
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* @param this calling object
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* @param request_idi ID payload representing initiator
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* @param request_idr ID payload representing responder (May be zero)
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* @param response The created IDr payload is added to this message_t object
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* @param response_idr The created IDr payload is also written to this location
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*/
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status_t (*build_idr_payload) (private_ike_sa_init_responded_t *this,
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id_payload_t *request_idi,
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id_payload_t *request_idr,
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message_t *response,
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id_payload_t **response_idr);
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/**
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* Process received SA payload and build SA payload for IKE_AUTH response.
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*
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* @param this calling object
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* @param request SA payload received in IKE_AUTH request
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* @param response The created SA payload is added to this message_t object
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*/
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status_t (*build_sa_payload) (private_ike_sa_init_responded_t *this, sa_payload_t *request, message_t *response);
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/**
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* Process received AUTH payload and build AUTH payload for IKE_AUTH response.
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*
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* @param this calling object
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* @param request AUTH payload received in IKE_AUTH request
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* @param other_id_payload other ID payload needed to verify AUTH data
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* @param my_id_payload my ID payload needed to compute AUTH data
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* @param response The created AUTH payload is added to this message_t object
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*/
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status_t (*build_auth_payload) (private_ike_sa_init_responded_t *this, auth_payload_t *request,id_payload_t *other_id_payload,id_payload_t *my_id_payload, message_t* response);
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/**
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* Process received TS payload and build TS payload for IKE_AUTH response.
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*
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* @param this calling object
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* @param is_initiator type of TS payload. TRUE for TSi, FALSE for TSr
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* @param request TS payload received in IKE_AUTH request
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* @param response the created TS payload is added to this message_t object
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*/
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status_t (*build_ts_payload) (private_ike_sa_init_responded_t *this, bool ts_initiator, ts_payload_t *request, message_t *response);
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/**
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* Sends a IKE_AUTH reply containing a notify payload.
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*
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* @param this calling object
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* @param notify_payload payload to process
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* @return
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* - DELETE_ME if IKE_SA should be deleted
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* - SUCCSS if processed successfull
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*/
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status_t (*process_notify_payload) (private_ike_sa_init_responded_t *this, notify_payload_t* notify_payload);
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};
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/**
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* Implements state_t.get_state
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*/
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static status_t process_message(private_ike_sa_init_responded_t *this, message_t *request)
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{
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id_payload_t *idi_request = NULL, *idr_request = NULL,*idr_response;
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ts_payload_t *tsi_request = NULL, *tsr_request = NULL;
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auth_payload_t *auth_request = NULL;
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sa_payload_t *sa_request = NULL;
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iterator_t *payloads;
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message_t *response;
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crypter_t *crypter;
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signer_t *signer;
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status_t status;
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host_t *my_host, *other_host;
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if (request->get_exchange_type(request) != IKE_AUTH)
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{
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this->logger->log(this->logger, ERROR | LEVEL1, "Message of type %s not supported in state ike_sa_init_responded",
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mapping_find(exchange_type_m,request->get_exchange_type(request)));
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return FAILED;
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}
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if (!request->get_request(request))
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{
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this->logger->log(this->logger, ERROR | LEVEL1, "IKE_AUTH responses not allowed state ike_sa_init_responded");
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return FAILED;
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}
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/* get signer for verification and crypter for decryption */
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signer = this->ike_sa->get_signer_initiator(this->ike_sa);
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crypter = this->ike_sa->get_crypter_initiator(this->ike_sa);
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status = request->parse_body(request, crypter, signer);
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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, ERROR | LEVEL1, "IKE_AUTH 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_AUTH, UNSUPPORTED_CRITICAL_PAYLOAD, CHUNK_INITIALIZER);
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return DELETE_ME;
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}
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else
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{
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this->logger->log(this->logger, AUDIT, "IKE_AUTH request decryption faild. Ignoring message");
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}
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return status;
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}
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/* iterate over incoming payloads. Message is verified, we can be sure there are the required payloads */
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payloads = request->get_payload_iterator(request);
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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 ID_INITIATOR:
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{
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idi_request = (id_payload_t*)payload;
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break;
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}
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case AUTHENTICATION:
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{
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auth_request = (auth_payload_t*)payload;
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break;
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}
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case ID_RESPONDER:
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{
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idr_request = (id_payload_t*)payload;
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break;
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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 TRAFFIC_SELECTOR_INITIATOR:
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{
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tsi_request = (ts_payload_t*)payload;
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break;
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}
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case TRAFFIC_SELECTOR_RESPONDER:
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{
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tsr_request = (ts_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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case CERTIFICATE:
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{
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/* TODO handle cert payloads */
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}
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case CERTIFICATE_REQUEST:
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{
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/* TODO handle certrequest payloads */
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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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/* iterator can be destroyed */
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payloads->destroy(payloads);
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/* check if we have all payloads */
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if (!(idi_request && sa_request && auth_request && tsi_request && tsr_request))
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{
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this->logger->log(this->logger, AUDIT, "IKE_AUTH reply did not contain all required payloads. Deleting IKE_SA");
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return DELETE_ME;
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}
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/* build response */
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this->ike_sa->build_message(this->ike_sa, IKE_AUTH, FALSE, &response);
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/* add payloads to it */
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status = this->build_idr_payload(this, idi_request, idr_request, response,&idr_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_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_auth_payload(this, auth_request,idi_request, idr_response,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_ts_payload(this, TRUE, tsi_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_ts_payload(this, FALSE, tsr_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->ike_sa->send_response(this->ike_sa, response);
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/* message can now be sent (must not be destroyed) */
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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_AUTH reply. 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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/* create new state */
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this->ike_sa->set_new_state(this->ike_sa, (state_t*)ike_sa_established_create(this->ike_sa));
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this->ike_sa->create_delete_established_ike_sa_job(this->ike_sa,this->sa_config->get_ike_sa_lifetime(this->sa_config));
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this->public.state_interface.destroy(&(this->public.state_interface));
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my_host = this->ike_sa->get_my_host(this->ike_sa);
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other_host = this->ike_sa->get_other_host(this->ike_sa);
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this->logger->log(this->logger, AUDIT, "IKE_SA established between %s - %s",
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my_host->get_address(my_host), other_host->get_address(other_host));
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return SUCCESS;
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}
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/**
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* Implementation of private_ike_sa_init_responded_t.build_idr_payload.
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*/
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static status_t build_idr_payload(private_ike_sa_init_responded_t *this, id_payload_t *request_idi, id_payload_t *request_idr, message_t *response,id_payload_t **response_idr)
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{
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identification_t *other_id, *my_id = NULL;
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init_config_t *init_config;
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status_t status;
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id_payload_t *idr_response;
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other_id = request_idi->get_identification(request_idi);
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if (request_idr)
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{
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my_id = request_idr->get_identification(request_idr);
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}
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/* build new sa config */
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init_config = this->ike_sa->get_init_config(this->ike_sa);
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status = charon->configuration_manager->get_sa_config_for_init_config_and_id(charon->configuration_manager,init_config, other_id,my_id, &(this->sa_config));
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if (status != SUCCESS)
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{
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if (my_id)
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{
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this->logger->log(this->logger, AUDIT, "IKE_AUTH request uses IDs %s to %s, which we have no config for",
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other_id->get_string(other_id),my_id->get_string(my_id));
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my_id->destroy(my_id);
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}
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else
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{
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this->logger->log(this->logger, AUDIT, "IKE_AUTH request uses ID %s, which we have no config for",
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other_id->get_string(other_id));
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}
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other_id->destroy(other_id);
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return DELETE_ME;
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}
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if (my_id)
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{
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my_id->destroy(my_id);
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}
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other_id->destroy(other_id);
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/* get my id, if not requested */
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my_id = this->sa_config->get_my_id(this->sa_config);
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/* set sa_config in ike_sa for other states */
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this->ike_sa->set_sa_config(this->ike_sa, this->sa_config);
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/* build response */
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idr_response = id_payload_create_from_identification(FALSE, my_id);
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response->add_payload(response, (payload_t*)idr_response);
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*response_idr = idr_response;
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return SUCCESS;
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}
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/**
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* Implementation of private_ike_sa_init_responded_t.build_sa_payload.
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*/
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static status_t build_sa_payload(private_ike_sa_init_responded_t *this, sa_payload_t *request, message_t *response)
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{
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child_proposal_t *proposals, *proposal_chosen;
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size_t proposal_count;
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status_t status;
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sa_payload_t *sa_response;
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/* dummy spis, until we have a child sa to request them */
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u_int8_t ah_spi[4] = {0x01, 0x02, 0x03, 0x04};
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u_int8_t esp_spi[4] = {0x05, 0x06, 0x07, 0x08};
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status = request->get_child_proposals(request, &proposals, &proposal_count);
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if (status == SUCCESS)
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{
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proposal_chosen = this->sa_config->select_proposal(this->sa_config, ah_spi, esp_spi, proposals, proposal_count);
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if (proposal_chosen != NULL)
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{
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sa_response = sa_payload_create_from_child_proposals(proposal_chosen, 1);
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response->add_payload(response, (payload_t*)sa_response);
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}
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else
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{
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this->logger->log(this->logger, AUDIT, "IKE_AUTH request did not contain any proposals we accept. Deleting IKE_SA");
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this->ike_sa->send_notify(this->ike_sa, IKE_AUTH, NO_PROPOSAL_CHOSEN, CHUNK_INITIALIZER);
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status = DELETE_ME;
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}
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}
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else
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{
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this->logger->log(this->logger, AUDIT, "IKE_AUH request did not contain any proposals. Don't create CHILD_SA.");
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/* this->ike_sa->send_notify(this->ike_sa, IKE_AUTH, NO_PROPOSAL_CHOSEN, CHUNK_INITIALIZER);
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status = DELETE_ME; */
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sa_response = sa_payload_create();
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response->add_payload(response, (payload_t*)sa_response);
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status = SUCCESS;
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}
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allocator_free(proposal_chosen);
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allocator_free(proposals);
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return status;
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}
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/**
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* Implementation of private_ike_sa_init_responded_t.build_auth_payload.
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*/
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static status_t build_auth_payload(private_ike_sa_init_responded_t *this, auth_payload_t *auth_request,id_payload_t *other_id_payload,id_payload_t *my_id_payload, message_t* response)
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{
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authenticator_t *authenticator;
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auth_payload_t *auth_reply;
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status_t status;
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authenticator = authenticator_create(this->ike_sa);
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status = authenticator->verify_auth_data(authenticator,auth_request, this->ike_sa_init_request_data,this->sent_nonce,other_id_payload,TRUE);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, AUDIT, "IKE_AUTH request verification failed. Deleting IKE_SA");
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this->ike_sa->send_notify(this->ike_sa, IKE_AUTH, AUTHENTICATION_FAILED, CHUNK_INITIALIZER);
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return DELETE_ME;
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}
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status = authenticator->compute_auth_data(authenticator,&auth_reply, this->ike_sa_init_response_data,this->received_nonce,my_id_payload,FALSE);
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authenticator->destroy(authenticator);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, AUDIT, "Unable to build authentication data for IKE_AUTH reply. Deleting IKE_SA");
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return DELETE_ME;
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}
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response->add_payload(response, (payload_t *)auth_reply);
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return SUCCESS;
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}
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/**
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* Implementation of private_ike_sa_init_responded_t.build_ts_payload.
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*/
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static status_t build_ts_payload(private_ike_sa_init_responded_t *this, bool ts_initiator, ts_payload_t *request, message_t* response)
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{
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traffic_selector_t **ts_received, **ts_selected;
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size_t ts_received_count, ts_selected_count;
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status_t status = SUCCESS;
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ts_payload_t *ts_response;
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/* build a reply payload with selected traffic selectors */
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ts_received_count = request->get_traffic_selectors(request, &ts_received);
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/* select ts depending on payload type */
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if (ts_initiator)
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{
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ts_selected_count = this->sa_config->select_traffic_selectors_initiator(this->sa_config, ts_received, ts_received_count, &ts_selected);
|
|
}
|
|
else
|
|
{
|
|
ts_selected_count = this->sa_config->select_traffic_selectors_responder(this->sa_config, ts_received, ts_received_count, &ts_selected);
|
|
}
|
|
if(ts_selected_count == 0)
|
|
{
|
|
this->logger->log(this->logger, AUDIT, "IKE_AUH request did not contain any traffic selectors.");
|
|
ts_response = ts_payload_create(ts_initiator);
|
|
response->add_payload(response, (payload_t*)ts_response);
|
|
}
|
|
else
|
|
{
|
|
ts_response = ts_payload_create_from_traffic_selectors(ts_initiator, ts_selected, ts_selected_count);
|
|
response->add_payload(response, (payload_t*)ts_response);
|
|
}
|
|
|
|
/* cleanup */
|
|
while(ts_received_count--)
|
|
{
|
|
traffic_selector_t *ts = *ts_received + ts_received_count;
|
|
ts->destroy(ts);
|
|
}
|
|
allocator_free(ts_received);
|
|
while(ts_selected_count--)
|
|
{
|
|
traffic_selector_t *ts = *ts_selected + ts_selected_count;
|
|
ts->destroy(ts);
|
|
}
|
|
allocator_free(ts_selected);
|
|
return status;
|
|
}
|
|
|
|
static status_t process_notify_payload(private_ike_sa_init_responded_t *this, notify_payload_t *notify_payload)
|
|
{
|
|
notify_message_type_t notify_message_type = notify_payload->get_notify_message_type(notify_payload);
|
|
|
|
this->logger->log(this->logger, CONTROL|LEVEL1, "Process notify type %s for protocol %s",
|
|
mapping_find(notify_message_type_m, notify_message_type),
|
|
mapping_find(protocol_id_m, notify_payload->get_protocol_id(notify_payload)));
|
|
|
|
if (notify_payload->get_protocol_id(notify_payload) != IKE)
|
|
{
|
|
this->logger->log(this->logger, AUDIT, "IKE_AUTH request contained a notify for an invalid protocol.");
|
|
return DELETE_ME;
|
|
}
|
|
switch (notify_message_type)
|
|
{
|
|
case SET_WINDOW_SIZE:
|
|
/*
|
|
* TODO Increase window size.
|
|
*/
|
|
case INITIAL_CONTACT:
|
|
/*
|
|
* TODO Delete existing IKE_SA's with other Identity.
|
|
*/
|
|
default:
|
|
{
|
|
this->logger->log(this->logger, AUDIT, "IKE_AUTH request contained an unknown notify (%d), ignored.", notify_message_type);
|
|
}
|
|
}
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Implementation of state_t.get_state.
|
|
*/
|
|
static ike_sa_state_t get_state(private_ike_sa_init_responded_t *this)
|
|
{
|
|
return IKE_SA_INIT_RESPONDED;
|
|
}
|
|
|
|
/**
|
|
* Implementation of state_t.get_state.
|
|
*/
|
|
static void destroy(private_ike_sa_init_responded_t *this)
|
|
{
|
|
this->logger->log(this->logger, CONTROL | LEVEL3, "Going to destroy ike_sa_init_responded_t state object");
|
|
|
|
this->logger->log(this->logger, CONTROL | LEVEL3, "Destroy received nonce");
|
|
allocator_free_chunk(&(this->received_nonce));
|
|
this->logger->log(this->logger, CONTROL | LEVEL3, "Destroy sent nonce");
|
|
allocator_free_chunk(&(this->sent_nonce));
|
|
this->logger->log(this->logger, CONTROL | LEVEL3, "Destroy IKE_SA_INIT response octets");
|
|
allocator_free_chunk(&(this->ike_sa_init_response_data));
|
|
this->logger->log(this->logger, CONTROL | LEVEL3, "Destroy IKE_SA_INIT request octets");
|
|
allocator_free_chunk(&(this->ike_sa_init_request_data));
|
|
|
|
allocator_free(this);
|
|
}
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
ike_sa_init_responded_t *ike_sa_init_responded_create(protected_ike_sa_t *ike_sa, chunk_t received_nonce, chunk_t sent_nonce,chunk_t ike_sa_init_request_data, chunk_t ike_sa_init_response_data)
|
|
{
|
|
private_ike_sa_init_responded_t *this = allocator_alloc_thing(private_ike_sa_init_responded_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_idr_payload = build_idr_payload;
|
|
this->build_sa_payload = build_sa_payload;
|
|
this->build_auth_payload = build_auth_payload;
|
|
this->build_ts_payload = build_ts_payload;
|
|
this->process_notify_payload = process_notify_payload;
|
|
|
|
/* private data */
|
|
this->ike_sa = ike_sa;
|
|
this->received_nonce = received_nonce;
|
|
this->sent_nonce = sent_nonce;
|
|
this->ike_sa_init_response_data = ike_sa_init_response_data;
|
|
this->ike_sa_init_request_data = ike_sa_init_request_data;
|
|
this->logger = this->ike_sa->get_logger(this->ike_sa);
|
|
|
|
return &(this->public);
|
|
}
|