183 lines
5.1 KiB
C
183 lines
5.1 KiB
C
/*
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* Copyright (C) 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_simaka_pseudonym_provider.h"
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#include <utils/hashtable.h>
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typedef struct private_eap_simaka_pseudonym_provider_t private_eap_simaka_pseudonym_provider_t;
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/**
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* Private data of an eap_simaka_pseudonym_provider_t object.
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*/
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struct private_eap_simaka_pseudonym_provider_t {
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/**
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* Public eap_simaka_pseudonym_provider_t interface.
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*/
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eap_simaka_pseudonym_provider_t public;
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/**
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* Permanent -> pseudonym mappings
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*/
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hashtable_t *pseudonym;
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/**
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* Reverse pseudonym -> permanent mappings
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*/
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hashtable_t *permanent;
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/**
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* RNG for pseudonyms/reauth identities
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*/
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rng_t *rng;
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};
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/**
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* hashtable hash function
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*/
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static u_int hash(identification_t *key)
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{
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return chunk_hash(key->get_encoding(key));
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}
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/**
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* hashtable equals function
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*/
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static bool equals(identification_t *key1, identification_t *key2)
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{
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return key1->equals(key1, key2);
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}
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/**
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* Implementation of simaka_provider_t.is_pseudonym
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*/
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static identification_t* is_pseudonym(
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private_eap_simaka_pseudonym_provider_t *this, identification_t *id)
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{
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identification_t *permanent;
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permanent = this->permanent->get(this->permanent, id);
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if (permanent)
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{
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return permanent->clone(permanent);
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}
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return NULL;
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}
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/**
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* Generate a random identity
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*/
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static identification_t *gen_identity(
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private_eap_simaka_pseudonym_provider_t *this)
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{
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char buf[8], hex[sizeof(buf) * 2 + 1];
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this->rng->get_bytes(this->rng, sizeof(buf), buf);
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chunk_to_hex(chunk_create(buf, sizeof(buf)), hex, FALSE);
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return identification_create_from_string(hex);
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}
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/**
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* Implementation of simaka_provider_t.get_pseudonym
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*/
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static identification_t* gen_pseudonym(
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private_eap_simaka_pseudonym_provider_t *this, identification_t *id)
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{
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identification_t *pseudonym, *permanent;
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/* remove old entry */
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pseudonym = this->pseudonym->remove(this->pseudonym, id);
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if (pseudonym)
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{
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permanent = this->permanent->remove(this->permanent, pseudonym);
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if (permanent)
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{
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permanent->destroy(permanent);
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}
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pseudonym->destroy(pseudonym);
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}
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pseudonym = gen_identity(this);
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/* create new entries */
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id = id->clone(id);
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this->pseudonym->put(this->pseudonym, id, pseudonym);
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this->permanent->put(this->permanent, pseudonym, id);
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return pseudonym->clone(pseudonym);
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}
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/**
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* Implementation of eap_simaka_pseudonym_provider_t.destroy.
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*/
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static void destroy(private_eap_simaka_pseudonym_provider_t *this)
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{
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enumerator_t *enumerator;
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identification_t *id;
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void *key;
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enumerator = this->pseudonym->create_enumerator(this->pseudonym);
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while (enumerator->enumerate(enumerator, &key, &id))
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{
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id->destroy(id);
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}
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enumerator->destroy(enumerator);
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enumerator = this->permanent->create_enumerator(this->permanent);
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while (enumerator->enumerate(enumerator, &key, &id))
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{
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id->destroy(id);
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}
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enumerator->destroy(enumerator);
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this->pseudonym->destroy(this->pseudonym);
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this->permanent->destroy(this->permanent);
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this->rng->destroy(this->rng);
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free(this);
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}
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/**
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* See header
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*/
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eap_simaka_pseudonym_provider_t *eap_simaka_pseudonym_provider_create()
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{
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private_eap_simaka_pseudonym_provider_t *this;
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this = malloc_thing(private_eap_simaka_pseudonym_provider_t);
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this->public.provider.get_triplet = (bool(*)(simaka_provider_t*, identification_t *id, char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN], char kc[SIM_KC_LEN]))return_false;
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this->public.provider.get_quintuplet = (bool(*)(simaka_provider_t*, identification_t *id, char rand[AKA_RAND_LEN], char xres[AKA_RES_MAX], int *xres_len, char ck[AKA_CK_LEN], char ik[AKA_IK_LEN], char autn[AKA_AUTN_LEN]))return_false;
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this->public.provider.resync = (bool(*)(simaka_provider_t*, identification_t *id, char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]))return_false;
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this->public.provider.is_pseudonym = (identification_t*(*)(simaka_provider_t*, identification_t *id))is_pseudonym;
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this->public.provider.gen_pseudonym = (identification_t*(*)(simaka_provider_t*, identification_t *id))gen_pseudonym;
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this->public.provider.is_reauth = (identification_t*(*)(simaka_provider_t*, identification_t *id, char [HASH_SIZE_SHA1], u_int16_t *counter))return_null;
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this->public.provider.gen_reauth = (identification_t*(*)(simaka_provider_t*, identification_t *id, char mk[HASH_SIZE_SHA1]))return_null;
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this->public.destroy = (void(*)(eap_simaka_pseudonym_provider_t*))destroy;
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this->rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
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if (!this->rng)
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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->pseudonym = hashtable_create((void*)hash, (void*)equals, 0);
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this->permanent = hashtable_create((void*)hash, (void*)equals, 0);
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return &this->public;
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}
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