366 lines
10 KiB
C
366 lines
10 KiB
C
/**
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* @file ike_sa_init_requested.c
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*
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* @brief State of a IKE_SA after requesting an IKE_SA_INIT
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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_requested.h"
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#include <globals.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 <transforms/diffie_hellman.h>
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typedef struct private_ike_sa_init_requested_t private_ike_sa_init_requested_t;
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/**
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* Private data of a ike_sa_init_requested_t object.
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*
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*/
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struct private_ike_sa_init_requested_t {
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/**
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* methods of the state_t interface
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*/
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ike_sa_init_requested_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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* Shared secret of successful exchange
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*/
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chunk_t shared_secret;
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/**
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* Sent nonce value
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*/
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chunk_t sent_nonce;
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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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* DH group priority used to get dh_group_number from configuration manager.
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*
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* Currently uused but usable if informational messages of unsupported dh group number are processed.
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*/
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u_int16_t dh_group_priority;
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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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/**
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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_requested_t *this, message_t *message)
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{
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status_t status;
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iterator_t *payloads;
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exchange_type_t exchange_type;
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u_int64_t responder_spi;
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ike_sa_id_t *ike_sa_id;
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exchange_type = message->get_exchange_type(message);
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if (exchange_type != IKE_SA_INIT)
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{
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this->logger->log(this->logger, ERROR | MORE, "Message of type %s not supported in state ike_sa_init_requested",mapping_find(exchange_type_m,exchange_type));
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return FAILED;
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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 | MORE, "Only responses of type IKE_SA_INIT supported in state ike_sa_init_requested");
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return FAILED;
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}
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/* parse incoming message */
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status = message->parse_body(message);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, ERROR | MORE, "Could not parse body");
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return status;
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}
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responder_spi = message->get_responder_spi(message);
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ike_sa_id = this->ike_sa->public.get_id(&(this->ike_sa->public));
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ike_sa_id->set_responder_spi(ike_sa_id,responder_spi);
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/* iterate over incoming payloads */
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status = message->get_payload_iterator(message, &payloads);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, ERROR, "Could not create payload interator");
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return status;
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}
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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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this->logger->log(this->logger, CONTROL|MORE, "Processing payload %s", mapping_find(payload_type_m, payload->get_type(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_payload_t *sa_payload = (sa_payload_t*)payload;
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iterator_t *suggested_proposals;
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proposal_substructure_t *suggested_proposal;
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bool valid;
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/* get the list of suggested proposals */
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status = sa_payload->create_proposal_substructure_iterator(sa_payload, &suggested_proposals, TRUE);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, ERROR, "Fatal errror: Could not create iterator on suggested proposals");
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payloads->destroy(payloads);
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return status;
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}
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/* now let the configuration-manager check the selected proposals*/
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this->logger->log(this->logger, CONTROL | MOST, "Check suggested proposals");
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status = global_configuration_manager->check_selected_proposals_for_host(global_configuration_manager,
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this->ike_sa->get_other_host(this->ike_sa), suggested_proposals,&valid);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, ERROR | MORE, "Could not check suggested proposals!");
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suggested_proposals->destroy(suggested_proposals);
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payloads->destroy(payloads);
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return status;
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}
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if (!valid)
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{
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this->logger->log(this->logger, ERROR | MORE, "Suggested proposals not accepted!");
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payloads->destroy(payloads);
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return status;
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}
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/* let the ike_sa create their own transforms from proposal informations */
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suggested_proposals->reset(suggested_proposals);
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/* TODO check for true*/
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suggested_proposals->has_next(suggested_proposals);
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status = suggested_proposals->current(suggested_proposals,(void **)&suggested_proposal);
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suggested_proposals->destroy(suggested_proposals);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, ERROR | MORE, "Could not get first proposal");
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payloads->destroy(payloads);
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return status;
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}
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status = this->ike_sa->create_transforms_from_proposal(this->ike_sa,suggested_proposal);
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, ERROR | MORE, "Transform objects could not be created from selected proposal");
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payloads->destroy(payloads);
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return status;
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}
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/* ok, we have what we need for sa_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_payload_t *ke_payload = (ke_payload_t*)payload;
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status = this->diffie_hellman->set_other_public_value(this->diffie_hellman, ke_payload->get_key_exchange_data(ke_payload));
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, ERROR, "Could not set other public value for DH exchange. Status %s",mapping_find(status_m,status));
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payloads->destroy(payloads);
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return OUT_OF_RES;
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}
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/* shared secret is computed AFTER processing of all payloads... */
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break;
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}
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case NONCE:
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{
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nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
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if (this->received_nonce.ptr != NULL)
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{
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this->logger->log(this->logger, CONTROL | MOST, "Destroy existing received nonce");
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allocator_free(this->received_nonce.ptr);
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this->received_nonce.ptr = NULL;
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this->received_nonce.len = 0;
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}
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status = nonce_payload->get_nonce(nonce_payload, &(this->received_nonce));
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if (status != SUCCESS)
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{
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this->logger->log(this->logger, ERROR, "Fatal error: Could not get received nonce");
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payloads->destroy(payloads);
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return OUT_OF_RES;
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}
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break;
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}
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default:
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{
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this->logger->log(this->logger, ERROR, "Fatal errror: Payload type not supported!!!!");
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payloads->destroy(payloads);
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return FAILED;
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}
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}
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}
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payloads->destroy(payloads);
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if (this->shared_secret.ptr != NULL)
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{
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this->logger->log(this->logger, CONTROL | MOST, "Destroy existing shared_secret");
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allocator_free(this->shared_secret.ptr);
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this->shared_secret.ptr = NULL;
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this->shared_secret.len = 0;
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}
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/* store shared secret */
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this->logger->log(this->logger, CONTROL | MOST, "Retrieve shared secret and store it");
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status = this->diffie_hellman->get_shared_secret(this->diffie_hellman, &(this->shared_secret));
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this->logger->log_chunk(this->logger, PRIVATE, "Shared secret", &this->shared_secret);
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status = this->ike_sa->compute_secrets(this->ike_sa,this->shared_secret,this->sent_nonce, this->received_nonce);
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if (status != SUCCESS)
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{
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/* secrets could not be computed */
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this->logger->log(this->logger, ERROR | MORE, "Secrets could not be computed!");
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return status;
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}
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/****************************
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*
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* TODO
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*
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* Send IKE_SA_AUTH request
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*
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* Make state change
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*
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****************************/
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/* set up the reply */
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// status = this->ike_sa->build_message(this->ike_sa, IKE_SA_INIT, FALSE, &response);
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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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// response->destroy(response);
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return SUCCESS;
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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 ike_sa_state_t get_state(private_ike_sa_init_requested_t *this)
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{
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return IKE_SA_INIT_REQUESTED;
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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 destroy(private_ike_sa_init_requested_t *this)
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{
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this->logger->log(this->logger, CONTROL | MORE, "Going to destroy state of type ike_sa_init_requested_t");
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this->logger->log(this->logger, CONTROL | MOST, "Destroy diffie hellman object");
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this->diffie_hellman->destroy(this->diffie_hellman);
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if (this->sent_nonce.ptr != NULL)
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{
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this->logger->log(this->logger, CONTROL | MOST, "Destroy sent nonce");
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allocator_free(this->sent_nonce.ptr);
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}
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if (this->received_nonce.ptr != NULL)
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{
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this->logger->log(this->logger, CONTROL | MOST, "Destroy received nonce");
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allocator_free(this->received_nonce.ptr);
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}
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if (this->shared_secret.ptr != NULL)
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{
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this->logger->log(this->logger, CONTROL | MOST, "Destroy shared secret");
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allocator_free(this->shared_secret.ptr);
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}
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allocator_free(this);
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return SUCCESS;
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}
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/*
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* Described in header.
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*/
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ike_sa_init_requested_t *ike_sa_init_requested_create(protected_ike_sa_t *ike_sa,u_int16_t dh_group_priority, diffie_hellman_t *diffie_hellman, chunk_t sent_nonce)
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{
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private_ike_sa_init_requested_t *this = allocator_alloc_thing(private_ike_sa_init_requested_t);
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if (this == NULL)
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{
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return NULL;
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}
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/* interface functions */
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this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *)) process_message;
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this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
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this->public.state_interface.destroy = (status_t (*) (state_t *)) destroy;
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/* private data */
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this->ike_sa = ike_sa;
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this->received_nonce.ptr = NULL;
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this->received_nonce.len = 0;
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this->shared_secret.ptr = NULL;
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this->shared_secret.len = 0;
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this->logger = this->ike_sa->get_logger(this->ike_sa);
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this->diffie_hellman = diffie_hellman;
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this->sent_nonce = sent_nonce;
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this->dh_group_priority = dh_group_priority;
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return &(this->public);
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}
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