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/*
* Copyright (C) 2008-2009 Martin Willi
* Copyright (C) 2008 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <library.h>
#include <debug.h>
#include "auth_cfg_wrapper.h"
typedef struct private_auth_cfg_wrapper_t private_auth_cfg_wrapper_t;
/**
* private data of auth_cfg_wrapper
*/
struct private_auth_cfg_wrapper_t {
/**
* public functions
*/
auth_cfg_wrapper_t public;
/**
* wrapped auth info
*/
auth_cfg_t *auth;
};
/**
* enumerator for auth_cfg_wrapper_t.create_cert_enumerator()
*/
typedef struct {
/** implements enumerator_t */
enumerator_t public;
/** inner enumerator from auth_cfg */
enumerator_t *inner;
/** wrapped auth round */
auth_cfg_t *auth;
/** enumerated cert type */
certificate_type_t cert;
/** enumerated key type */
key_type_t key;
/** enumerated id */
identification_t *id;
} wrapper_enumerator_t;
/**
* Tries to fetch a certificate that was supplied as "Hash and URL"
* (replaces rule type and value in place).
*/
static bool fetch_cert(wrapper_enumerator_t *enumerator,
auth_rule_t *rule, void **value)
{
char *url = (char*)*value;
if (!url)
{
/* fetching the certificate previously failed */
return FALSE;
}
chunk_t data;
certificate_t *cert;
DBG1(DBG_CFG, " fetching certificate from '%s' ...", url);
if (lib->fetcher->fetch(lib->fetcher, url, &data, FETCH_END) != SUCCESS)
{
DBG1(DBG_CFG, " fetching certificate failed");
/* we set the item to NULL, so we can skip it */
enumerator->auth->replace(enumerator->auth, enumerator->inner,
*rule, NULL);
return FALSE;
}
cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_BLOB_ASN1_DER, data, BUILD_END);
free(data.ptr);
if (!cert)
{
DBG1(DBG_CFG, " parsing fetched certificate failed");
/* we set the item to NULL, so we can skip it */
enumerator->auth->replace(enumerator->auth, enumerator->inner,
*rule, NULL);
return FALSE;
}
DBG1(DBG_CFG, " fetched certificate \"%Y\"", cert->get_subject(cert));
lib->credmgr->cache_cert(lib->credmgr, cert);
if (*rule == AUTH_HELPER_IM_HASH_URL)
{
*rule = AUTH_HELPER_IM_CERT;
}
else
{
*rule = AUTH_HELPER_SUBJECT_CERT;
}
*value = cert;
enumerator->auth->replace(enumerator->auth, enumerator->inner,
*rule, cert->get_ref(cert));
return TRUE;
}
/**
* enumerate function for wrapper_enumerator_t
*/
static bool enumerate(wrapper_enumerator_t *this, certificate_t **cert)
{
auth_rule_t rule;
certificate_t *current;
public_key_t *public;
while (this->inner->enumerate(this->inner, &rule, ¤t))
{
if (rule == AUTH_HELPER_IM_HASH_URL ||
rule == AUTH_HELPER_SUBJECT_HASH_URL)
{ /* on-demand fetching of hash and url certificates */
if (!fetch_cert(this, &rule, (void**)¤t))
{
continue;
}
}
else if (rule != AUTH_HELPER_SUBJECT_CERT &&
rule != AUTH_HELPER_IM_CERT &&
rule != AUTH_HELPER_REVOCATION_CERT)
{ /* handle only HELPER certificates */
continue;
}
if (this->cert != CERT_ANY && this->cert != current->get_type(current))
{ /* CERT type requested, but does not match */
continue;
}
public = current->get_public_key(current);
if (this->key != KEY_ANY && !public)
{ /* key type requested, but no public key */
DESTROY_IF(public);
continue;
}
if (this->key != KEY_ANY && public && this->key != public->get_type(public))
{ /* key type requested, but public key has another type */
DESTROY_IF(public);
continue;
}
DESTROY_IF(public);
if (this->id && !current->has_subject(current, this->id))
{ /* subject requested, but does not match */
continue;
}
*cert = current;
return TRUE;
}
return FALSE;
}
/**
* destroy function for wrapper_enumerator_t
*/
static void wrapper_enumerator_destroy(wrapper_enumerator_t *this)
{
this->inner->destroy(this->inner);
free(this);
}
/**
* implementation of auth_cfg_wrapper_t.set.create_cert_enumerator
*/
static enumerator_t *create_enumerator(private_auth_cfg_wrapper_t *this,
certificate_type_t cert, key_type_t key,
identification_t *id, bool trusted)
{
wrapper_enumerator_t *enumerator;
if (trusted)
{
return NULL;
}
enumerator = malloc_thing(wrapper_enumerator_t);
enumerator->auth = this->auth;
enumerator->cert = cert;
enumerator->key = key;
enumerator->id = id;
enumerator->inner = this->auth->create_enumerator(this->auth);
enumerator->public.enumerate = (void*)enumerate;
enumerator->public.destroy = (void*)wrapper_enumerator_destroy;
return &enumerator->public;
}
/**
* Implementation of auth_cfg_wrapper_t.destroy
*/
static void destroy(private_auth_cfg_wrapper_t *this)
{
free(this);
}
/*
* see header file
*/
auth_cfg_wrapper_t *auth_cfg_wrapper_create(auth_cfg_t *auth)
{
private_auth_cfg_wrapper_t *this = malloc_thing(private_auth_cfg_wrapper_t);
this->public.set.create_private_enumerator = (void*)return_null;
this->public.set.create_cert_enumerator = (void*)create_enumerator;
this->public.set.create_shared_enumerator = (void*)return_null;
this->public.set.create_cdp_enumerator = (void*)return_null;
this->public.set.cache_cert = (void*)nop;
this->public.destroy = (void(*)(auth_cfg_wrapper_t*))destroy;
this->auth = auth;
return &this->public;
}
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