2007-02-28 14:04:36 +00:00
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/**
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* @file ike_auth.c
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*
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* @brief Implementation of the ike_auth task.
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*
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*/
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/*
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* Copyright (C) 2005-2007 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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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_auth.h"
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#include <string.h>
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#include <daemon.h>
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#include <crypto/diffie_hellman.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/nonce_payload.h>
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typedef struct private_ike_auth_t private_ike_auth_t;
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/**
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* Private members of a ike_auth_t task.
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*/
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struct private_ike_auth_t {
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/**
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* Public methods and task_t interface.
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*/
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ike_auth_t public;
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/**
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* Assigned IKE_SA.
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*/
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ike_sa_t *ike_sa;
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/**
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* Are we the initiator?
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*/
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bool initiator;
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/**
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* Nonce chosen by us in ike_init
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*/
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chunk_t my_nonce;
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/**
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* Nonce chosen by peer in ike_init
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*/
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chunk_t other_nonce;
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/**
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* IKE_SA_INIT message sent by us
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*/
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packet_t *my_packet;
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/**
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* IKE_SA_INIT message sent by peer
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*/
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packet_t *other_packet;
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/**
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* authenticator to authenticate us
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*/
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authenticator_t *my_auth;
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/**
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* authenticator to authenticate peer
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*/
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authenticator_t *other_auth;
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/**
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* has the peer been authenticated successfully?
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*/
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bool peer_authenticated;
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};
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/**
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* build the payloads for the message
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*/
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static status_t build_payloads(private_ike_auth_t *this, message_t *message)
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{
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authenticator_t *auth;
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auth_payload_t *auth_payload;
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id_payload_t *id_payload;
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chunk_t ike_sa_init;
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identification_t *me, *other;
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policy_t *policy;
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auth_method_t method = AUTH_RSA;
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status_t status;
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/* add own ID payload */
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me = this->ike_sa->get_my_id(this->ike_sa);
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other = this->ike_sa->get_other_id(this->ike_sa);
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2007-03-05 15:22:50 +00:00
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/* create own authenticator and add auth payload */
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policy = this->ike_sa->get_policy(this->ike_sa);
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if (!policy)
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{
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SIG(IKE_UP_FAILED, "no acceptable policy found");
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return FAILED;
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}
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method = policy->get_auth_method(policy);
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if (me->contains_wildcards(me))
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{
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me = policy->get_my_id(policy);
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if (me->contains_wildcards(me))
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{
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SIG(IKE_UP_FAILED, "negotiation of own ID failed");
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return FAILED;
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}
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2007-03-05 22:02:14 +00:00
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this->ike_sa->set_my_id(this->ike_sa, me->clone(me));
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2007-03-05 15:22:50 +00:00
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}
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2007-02-28 14:04:36 +00:00
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id_payload = id_payload_create_from_identification(this->initiator, me);
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message->add_payload(message, (payload_t*)id_payload);
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/* as initiator, include other ID if it does not contain wildcards */
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if (this->initiator && !other->contains_wildcards(other))
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{
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id_payload = id_payload_create_from_identification(FALSE, other);
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message->add_payload(message, (payload_t*)id_payload);
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}
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auth = authenticator_create(this->ike_sa, method);
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if (auth == NULL)
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{
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SIG(IKE_UP_FAILED, "configured authentication method %N not supported",
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auth_method_names, method);
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return FAILED;
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}
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ike_sa_init = this->my_packet->get_data(this->my_packet);
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status = auth->build(auth, ike_sa_init, this->other_nonce, &auth_payload);
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auth->destroy(auth);
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if (status != SUCCESS)
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{
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SIG(IKE_UP_FAILED, "generating authentication data failed");
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return FAILED;
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}
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message->add_payload(message, (payload_t*)auth_payload);
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return SUCCESS;
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}
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/**
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* process payloads from message
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*/
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static void process_payloads(private_ike_auth_t *this, message_t *message)
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{
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iterator_t *iterator;
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payload_t *payload;
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payload_type_t type;
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identification_t *idi = NULL, *idr = NULL;
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auth_payload_t *auth_payload = NULL;
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authenticator_t *auth;
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auth_method_t auth_method;
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status_t status;
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iterator = message->get_payload_iterator(message);
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while (iterator->iterate(iterator, (void**)&payload))
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{
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type = payload->get_type(payload);
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switch (type)
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{
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case ID_INITIATOR:
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{
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id_payload_t *id_payload = (id_payload_t*)payload;
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idi = id_payload->get_identification(id_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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id_payload_t *id_payload = (id_payload_t*)payload;
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idr = id_payload->get_identification(id_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_payload = (auth_payload_t*)payload;
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break;
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}
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default:
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break;
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}
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}
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iterator->destroy(iterator);
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/* apply IDs */
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if ((this->initiator && idr == NULL) || (!this->initiator && idi == NULL))
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{
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SIG(IKE_UP_FAILED, "ID payload missing in message");
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DESTROY_IF(idr); DESTROY_IF(idi);
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return;
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}
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if (this->initiator)
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{
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this->ike_sa->set_other_id(this->ike_sa, idr);
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2007-03-05 22:02:14 +00:00
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DESTROY_IF(idi);
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2007-02-28 14:04:36 +00:00
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}
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else
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{
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if (idr)
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{
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this->ike_sa->set_my_id(this->ike_sa, idr);
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}
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this->ike_sa->set_other_id(this->ike_sa, idi);
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}
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/* verify auth payload */
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if (auth_payload == NULL)
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{
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SIG(IKE_UP_FAILED, "AUTH payload missing in message");
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return;
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}
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auth_method = auth_payload->get_auth_method(auth_payload);
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auth = authenticator_create(this->ike_sa, auth_method);
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if (auth == NULL)
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{
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SIG(IKE_UP_FAILED, "authentication method %N used by %D not "
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"supported", auth_method_names, auth_method,
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this->ike_sa->get_other_id(this->ike_sa));
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return;
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}
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status = auth->verify(auth, this->other_packet->get_data(this->other_packet),
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this->my_nonce, auth_payload);
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auth->destroy(auth);
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if (status != SUCCESS)
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{
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SIG(IKE_UP_FAILED, "authentication of %D using %N failed",
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this->ike_sa->get_other_id(this->ike_sa),
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auth_method_names, auth_method);
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return;
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}
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this->peer_authenticated = TRUE;
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}
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/**
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* collect the needed information in the IKE_SA_INIT exchange from our message
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*/
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static status_t collect_my_init_data(private_ike_auth_t *this, message_t *message)
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{
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nonce_payload_t *nonce;
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/* get the nonce that was generated in ike_init */
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nonce = (nonce_payload_t*)message->get_payload(message, NONCE);
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if (nonce == NULL)
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{
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return FAILED;
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}
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this->my_nonce = nonce->get_nonce(nonce);
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/* pre-generate the message, so we can store it for us */
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if (this->ike_sa->generate_message(this->ike_sa, message,
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&this->my_packet) != SUCCESS)
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{
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return FAILED;
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}
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return NEED_MORE;
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}
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/**
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* collect the needed information in the IKE_SA_INIT exchange from others message
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*/
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static status_t collect_other_init_data(private_ike_auth_t *this, message_t *message)
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{
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/* we collect the needed information in the IKE_SA_INIT exchange */
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nonce_payload_t *nonce;
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/* get the nonce that was generated in ike_init */
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nonce = (nonce_payload_t*)message->get_payload(message, NONCE);
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if (nonce == NULL)
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{
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return FAILED;
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}
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this->other_nonce = nonce->get_nonce(nonce);
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/* pre-generate the message, so we can store it for us */
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this->other_packet = message->get_packet(message);
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.build for initiator
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*/
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static status_t build_i(private_ike_auth_t *this, message_t *message)
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{
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if (message->get_exchange_type(message) == IKE_SA_INIT)
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{
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return collect_my_init_data(this, message);
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}
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if (build_payloads(this, message) == SUCCESS)
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{
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return NEED_MORE;
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}
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return FAILED;
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t process_r(private_ike_auth_t *this, message_t *message)
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{
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if (message->get_exchange_type(message) == IKE_SA_INIT)
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{
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return collect_other_init_data(this, message);
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}
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process_payloads(this, message);
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.build for responder
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*/
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static status_t build_r(private_ike_auth_t *this, message_t *message)
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{
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if (message->get_exchange_type(message) == IKE_SA_INIT)
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{
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return collect_my_init_data(this, message);
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}
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2007-03-05 15:22:50 +00:00
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if (this->peer_authenticated && build_payloads(this, message) == SUCCESS)
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2007-02-28 14:04:36 +00:00
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{
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this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
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SIG(IKE_UP_SUCCESS, "IKE_SA established between %D[%H]...[%H]%D",
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this->ike_sa->get_my_id(this->ike_sa),
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this->ike_sa->get_my_host(this->ike_sa),
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this->ike_sa->get_other_host(this->ike_sa),
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this->ike_sa->get_other_id(this->ike_sa));
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return SUCCESS;
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}
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2007-03-05 15:22:50 +00:00
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message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
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2007-02-28 14:04:36 +00:00
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return FAILED;
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t process_i(private_ike_auth_t *this, message_t *message)
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{
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iterator_t *iterator;
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payload_t *payload;
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if (message->get_exchange_type(message) == IKE_SA_INIT)
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{
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return collect_other_init_data(this, message);
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}
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iterator = message->get_payload_iterator(message);
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while (iterator->iterate(iterator, (void**)&payload))
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{
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if (payload->get_type(payload) == NOTIFY)
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{
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notify_payload_t *notify = (notify_payload_t*)payload;
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notify_type_t type = notify->get_notify_type(notify);
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switch (type)
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{
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case NO_PROPOSAL_CHOSEN:
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case SINGLE_PAIR_REQUIRED:
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case NO_ADDITIONAL_SAS:
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case INTERNAL_ADDRESS_FAILURE:
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case FAILED_CP_REQUIRED:
|
|
|
|
case TS_UNACCEPTABLE:
|
|
|
|
case INVALID_SELECTORS:
|
|
|
|
/* these are errors, but are not critical as only the
|
|
|
|
* CHILD_SA won't get build, but IKE_SA establishes anyway */
|
|
|
|
DBG1(DBG_IKE, "received %N notify, no CHILD_SA built",
|
|
|
|
notify_type_names, type);
|
|
|
|
iterator->destroy(iterator);
|
|
|
|
return SUCCESS;
|
|
|
|
default:
|
|
|
|
{
|
|
|
|
if (type < 16383)
|
|
|
|
{
|
|
|
|
DBG1(DBG_IKE, "received %N notify error",
|
|
|
|
notify_type_names, type);
|
|
|
|
iterator->destroy(iterator);
|
|
|
|
return FAILED;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
iterator->destroy(iterator);
|
|
|
|
|
|
|
|
process_payloads(this, message);
|
|
|
|
|
|
|
|
if (this->peer_authenticated)
|
|
|
|
{
|
|
|
|
this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
|
|
|
|
SIG(IKE_UP_SUCCESS, "IKE_SA established between %D[%H]...[%H]%D",
|
|
|
|
this->ike_sa->get_my_id(this->ike_sa),
|
|
|
|
this->ike_sa->get_my_host(this->ike_sa),
|
|
|
|
this->ike_sa->get_other_host(this->ike_sa),
|
|
|
|
this->ike_sa->get_other_id(this->ike_sa));
|
|
|
|
return SUCCESS;
|
|
|
|
}
|
|
|
|
return FAILED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Implementation of task_t.get_type
|
|
|
|
*/
|
|
|
|
static task_type_t get_type(private_ike_auth_t *this)
|
|
|
|
{
|
|
|
|
return IKE_AUTHENTICATE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Implementation of task_t.migrate
|
|
|
|
*/
|
|
|
|
static void migrate(private_ike_auth_t *this, ike_sa_t *ike_sa)
|
|
|
|
{
|
|
|
|
chunk_free(&this->my_nonce);
|
|
|
|
chunk_free(&this->other_nonce);
|
|
|
|
DESTROY_IF(this->my_packet);
|
|
|
|
DESTROY_IF(this->other_packet);
|
|
|
|
DESTROY_IF(this->my_auth);
|
|
|
|
DESTROY_IF(this->other_auth);
|
|
|
|
this->my_packet = NULL;
|
|
|
|
this->other_packet = NULL;
|
|
|
|
this->my_auth = NULL;
|
|
|
|
this->other_auth = NULL;
|
|
|
|
this->peer_authenticated = FALSE;
|
|
|
|
this->ike_sa = ike_sa;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Implementation of task_t.destroy
|
|
|
|
*/
|
|
|
|
static void destroy(private_ike_auth_t *this)
|
|
|
|
{
|
|
|
|
chunk_free(&this->my_nonce);
|
|
|
|
chunk_free(&this->other_nonce);
|
|
|
|
DESTROY_IF(this->my_packet);
|
|
|
|
DESTROY_IF(this->other_packet);
|
|
|
|
DESTROY_IF(this->my_auth);
|
|
|
|
DESTROY_IF(this->other_auth);
|
|
|
|
free(this);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Described in header.
|
|
|
|
*/
|
|
|
|
ike_auth_t *ike_auth_create(ike_sa_t *ike_sa, bool initiator)
|
|
|
|
{
|
|
|
|
private_ike_auth_t *this = malloc_thing(private_ike_auth_t);
|
|
|
|
|
|
|
|
this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
|
|
|
|
this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
|
|
|
|
this->public.task.destroy = (void(*)(task_t*))destroy;
|
|
|
|
|
|
|
|
if (initiator)
|
|
|
|
{
|
|
|
|
this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
|
|
|
|
this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
|
|
|
|
this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
|
|
|
|
}
|
|
|
|
|
|
|
|
this->ike_sa = ike_sa;
|
|
|
|
this->initiator = initiator;
|
|
|
|
this->my_nonce = chunk_empty;
|
|
|
|
this->other_nonce = chunk_empty;
|
|
|
|
this->my_packet = NULL;
|
|
|
|
this->other_packet = NULL;
|
|
|
|
this->my_auth = NULL;
|
|
|
|
this->other_auth = NULL;
|
|
|
|
this->peer_authenticated = FALSE;
|
|
|
|
|
|
|
|
return &this->public;
|
|
|
|
}
|