423 lines
9.5 KiB
C
423 lines
9.5 KiB
C
/*
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* Copyright (C) 2006-2009 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 "eap_aka_server.h"
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#include <daemon.h>
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#include <library.h>
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#include <simaka_message.h>
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#include <simaka_crypto.h>
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typedef struct private_eap_aka_server_t private_eap_aka_server_t;
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/**
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* Private data of an eap_aka_server_t object.
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*/
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struct private_eap_aka_server_t {
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/**
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* Public authenticator_t interface.
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*/
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eap_aka_server_t public;
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/**
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* EAP-AKA crypto helper
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*/
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simaka_crypto_t *crypto;
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/**
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* ID of the peer
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*/
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identification_t *peer;
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/**
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* EAP identifier value
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*/
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u_int8_t identifier;
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/**
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* MSK
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*/
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chunk_t msk;
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/**
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* Expected Result XRES
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*/
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chunk_t xres;
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/**
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* Random value RAND
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*/
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chunk_t rand;
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/**
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* EAP-AKA message we have initiated
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*/
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simaka_subtype_t pending;
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/**
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* Did the client send a synchronize request?
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*/
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bool synchronized;
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};
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/**
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* Check if an unknown attribute is skippable
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*/
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static bool attribute_skippable(simaka_attribute_t attribute)
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{
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if (attribute >= 0 && attribute <= 127)
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{
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DBG1(DBG_IKE, "ignoring skippable attribute %N",
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simaka_attribute_names, attribute);
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Implementation of eap_method_t.initiate
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*/
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static status_t initiate(private_eap_aka_server_t *this, eap_payload_t **out)
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{
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simaka_message_t *message;
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enumerator_t *enumerator;
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sim_provider_t *provider;
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char rand[AKA_RAND_LEN], xres[AKA_RES_LEN];
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char ck[AKA_CK_LEN], ik[AKA_IK_LEN], autn[AKA_AUTN_LEN];
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chunk_t data;
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bool found = FALSE;
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enumerator = charon->sim->create_provider_enumerator(charon->sim);
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while (enumerator->enumerate(enumerator, &provider))
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{
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if (provider->get_quintuplet(provider, this->peer,
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rand, xres, ck, ik, autn))
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{
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found = TRUE;
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break;
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}
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}
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enumerator->destroy(enumerator);
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if (!found)
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{
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DBG1(DBG_IKE, "no AKA provider found with quintuplets for '%Y'",
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this->peer);
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return FAILED;
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}
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data = chunk_cata("cc", chunk_create(ik, AKA_IK_LEN),
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chunk_create(ck, AKA_CK_LEN));
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free(this->msk.ptr);
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this->msk = this->crypto->derive_keys_full(this->crypto, this->peer, data);
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this->rand = chunk_clone(chunk_create(rand, AKA_RAND_LEN));
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this->xres = chunk_clone(chunk_create(xres, AKA_RES_LEN));
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message = simaka_message_create(TRUE, this->identifier++,
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EAP_AKA, AKA_CHALLENGE);
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message->add_attribute(message, AT_RAND, this->rand);
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message->add_attribute(message, AT_AUTN, chunk_create(autn, AKA_AUTN_LEN));
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*out = message->generate(message, this->crypto, chunk_empty);
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message->destroy(message);
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this->pending = AKA_CHALLENGE;
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return NEED_MORE;
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}
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/**
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* Process EAP-AKA/Response/Challenge message
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*/
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static status_t process_challenge(private_eap_aka_server_t *this,
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simaka_message_t *in)
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{
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enumerator_t *enumerator;
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simaka_attribute_t type;
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chunk_t data, res = chunk_empty;
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if (this->pending != AKA_CHALLENGE)
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{
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DBG1(DBG_IKE, "received %N, but not expected",
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simaka_subtype_names, AKA_CHALLENGE);
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return FAILED;
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}
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enumerator = in->create_attribute_enumerator(in);
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while (enumerator->enumerate(enumerator, &type, &data))
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{
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switch (type)
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{
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case AT_RES:
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res = data;
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break;
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default:
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if (!attribute_skippable(type))
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{
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enumerator->destroy(enumerator);
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DBG1(DBG_IKE, "found non skippable attribute %N",
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simaka_attribute_names, type);
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return FAILED;
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}
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break;
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}
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}
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enumerator->destroy(enumerator);
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/* verify MAC of EAP message, AT_MAC */
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if (!in->verify(in, this->crypto, chunk_empty))
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{
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DBG1(DBG_IKE, "AT_MAC verification failed");
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return FAILED;
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}
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/* compare received RES against stored XRES */
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if (!chunk_equals(res, this->xres))
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{
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DBG1(DBG_IKE, "received RES does not match XRES");
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return FAILED;
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}
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return SUCCESS;
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}
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/**
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* Process EAP-AKA/Response/SynchronizationFailure message
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*/
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static status_t process_synchronize(private_eap_aka_server_t *this,
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simaka_message_t *in, eap_payload_t **out)
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{
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sim_provider_t *provider;
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enumerator_t *enumerator;
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simaka_attribute_t type;
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chunk_t data, auts = chunk_empty;
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bool found = FALSE;
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if (this->synchronized)
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{
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DBG1(DBG_IKE, "received %N, but peer did already resynchronize",
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simaka_subtype_names, AKA_SYNCHRONIZATION_FAILURE);
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return FAILED;
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}
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DBG1(DBG_IKE, "received synchronization request, retrying...");
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enumerator = in->create_attribute_enumerator(in);
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while (enumerator->enumerate(enumerator, &type, &data))
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{
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switch (type)
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{
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case AT_AUTS:
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auts = data;
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break;
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default:
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if (!attribute_skippable(type))
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{
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enumerator->destroy(enumerator);
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DBG1(DBG_IKE, "found non skippable attribute %N",
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simaka_attribute_names, type);
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return FAILED;
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}
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break;
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}
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}
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enumerator->destroy(enumerator);
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if (!auts.len)
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{
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DBG1(DBG_IKE, "synchronization request didn't contain usable AUTS");
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return FAILED;
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}
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enumerator = charon->sim->create_provider_enumerator(charon->sim);
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while (enumerator->enumerate(enumerator, &provider))
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{
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if (provider->resync(provider, this->peer, this->rand.ptr, auts.ptr))
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{
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found = TRUE;
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break;
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}
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}
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enumerator->destroy(enumerator);
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if (!found)
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{
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DBG1(DBG_IKE, "no AKA provider found supporting "
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"resynchronization for '%Y'", this->peer);
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return FAILED;
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}
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this->synchronized = TRUE;
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return initiate(this, out);
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}
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/**
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* Process EAP-AKA/Response/ClientErrorCode message
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*/
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static status_t process_client_error(private_eap_aka_server_t *this,
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simaka_message_t *in)
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{
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enumerator_t *enumerator;
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simaka_attribute_t type;
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chunk_t data;
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enumerator = in->create_attribute_enumerator(in);
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while (enumerator->enumerate(enumerator, &type, &data))
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{
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if (type == AT_CLIENT_ERROR_CODE)
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{
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u_int16_t code;
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memcpy(&code, data.ptr, sizeof(code));
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DBG1(DBG_IKE, "received EAP-AKA client error '%N'",
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simaka_client_error_names, ntohs(code));
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}
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else if (!simaka_attribute_skippable(type))
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{
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break;
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}
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}
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enumerator->destroy(enumerator);
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return FAILED;
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}
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/**
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* Process EAP-AKA/Response/AuthenticationReject message
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*/
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static status_t process_authentication_reject(private_eap_aka_server_t *this,
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simaka_message_t *in)
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{
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DBG1(DBG_IKE, "received %N, authentication failed",
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simaka_subtype_names, in->get_subtype(in));
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return FAILED;
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}
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/**
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* Implementation of eap_method_t.process
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*/
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static status_t process(private_eap_aka_server_t *this,
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eap_payload_t *in, eap_payload_t **out)
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{
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simaka_message_t *message;
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status_t status;
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message = simaka_message_create_from_payload(in);
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if (!message)
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{
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return FAILED;
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}
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if (!message->parse(message, this->crypto))
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{
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message->destroy(message);
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return FAILED;
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}
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switch (message->get_subtype(message))
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{
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case AKA_CHALLENGE:
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status = process_challenge(this, message);
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break;
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case AKA_SYNCHRONIZATION_FAILURE:
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status = process_synchronize(this, message, out);
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break;
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case AKA_CLIENT_ERROR:
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status = process_client_error(this, message);
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break;
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case AKA_AUTHENTICATION_REJECT:
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status = process_authentication_reject(this, message);
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break;
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default:
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DBG1(DBG_IKE, "unable to process EAP-AKA subtype %N",
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simaka_subtype_names, message->get_subtype(message));
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status = FAILED;
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break;
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}
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message->destroy(message);
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return status;
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}
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/**
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* Implementation of eap_method_t.get_type.
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*/
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static eap_type_t get_type(private_eap_aka_server_t *this, u_int32_t *vendor)
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{
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*vendor = 0;
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return EAP_AKA;
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}
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/**
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* Implementation of eap_method_t.get_msk.
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*/
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static status_t get_msk(private_eap_aka_server_t *this, chunk_t *msk)
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{
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if (this->msk.ptr)
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{
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*msk = this->msk;
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return SUCCESS;
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}
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return FAILED;
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}
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/**
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* Implementation of eap_method_t.is_mutual.
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*/
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static bool is_mutual(private_eap_aka_server_t *this)
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{
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return TRUE;
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}
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/**
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* Implementation of eap_method_t.destroy.
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*/
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static void destroy(private_eap_aka_server_t *this)
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{
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this->crypto->destroy(this->crypto);
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this->peer->destroy(this->peer);
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free(this->msk.ptr);
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free(this->xres.ptr);
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free(this->rand.ptr);
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free(this);
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}
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/*
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* Described in header.
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*/
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eap_aka_server_t *eap_aka_server_create(identification_t *server,
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identification_t *peer)
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{
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private_eap_aka_server_t *this = malloc_thing(private_eap_aka_server_t);
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this->public.interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate;
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this->public.interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process;
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this->public.interface.get_type = (eap_type_t(*)(eap_method_t*,u_int32_t*))get_type;
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this->public.interface.is_mutual = (bool(*)(eap_method_t*))is_mutual;
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this->public.interface.get_msk = (status_t(*)(eap_method_t*,chunk_t*))get_msk;
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this->public.interface.destroy = (void(*)(eap_method_t*))destroy;
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this->crypto = simaka_crypto_create();
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if (!this->crypto)
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{
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free(this);
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return NULL;
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}
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this->peer = peer->clone(peer);
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this->msk = chunk_empty;
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this->xres = chunk_empty;
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this->rand = chunk_empty;
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this->pending = 0;
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this->synchronized = FALSE;
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/* generate a non-zero identifier */
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do {
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this->identifier = random();
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} while (!this->identifier);
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return &this->public;
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}
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