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/*
* Copyright (C) 2008 Martin Willi
* 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.
*
* $Id: credential_factory.c 4317 2008-09-02 11:00:13Z martin $
*/
#include "credential_factory.h"
#include <debug.h>
#include <utils/linked_list.h>
#include <utils/mutex.h>
#include <credentials/certificates/x509.h>
ENUM(credential_type_names, CRED_PRIVATE_KEY, CRED_CERTIFICATE,
"CRED_PRIVATE_KEY",
"CRED_PUBLIC_KEY",
"CRED_CERTIFICATE",
);
typedef struct private_credential_factory_t private_credential_factory_t;
/**
* private data of credential_factory
*/
struct private_credential_factory_t {
/**
* public functions
*/
credential_factory_t public;
/**
* list with entry_t
*/
linked_list_t *constructors;
/**
* mutex to lock access to modules
*/
mutex_t *mutex;
};
typedef struct entry_t entry_t;
struct entry_t {
/** kind of credential builder */
credential_type_t type;
/** subtype of credential, e.g. certificate_type_t */
int subtype;
/** builder construction function */
builder_constructor_t constructor;
};
/**
* type/subtype filter function for builder_enumerator
*/
static bool builder_filter(entry_t *data, entry_t **in, builder_t **out)
{
if (data->type == (*in)->type &&
data->subtype == (*in)->subtype)
{
*out = (*in)->constructor(data->subtype);
return TRUE;
}
return FALSE;
}
/**
* Implementation of credential_factory_t.create_builder_enumerator.
*/
static enumerator_t* create_builder_enumerator(
private_credential_factory_t *this, credential_type_t type, int subtype)
{
entry_t *data = malloc_thing(entry_t);
data->type = type;
data->subtype = subtype;
this->mutex->lock(this->mutex);
return enumerator_create_cleaner(
enumerator_create_filter(
this->constructors->create_enumerator(this->constructors),
(void*)builder_filter, data, free),
(void*)this->mutex->unlock, this->mutex);
}
/**
* Implementation of credential_factory_t.add_builder_constructor.
*/
static void add_builder(private_credential_factory_t *this,
credential_type_t type, int subtype,
builder_constructor_t constructor)
{
entry_t *entry = malloc_thing(entry_t);
entry->type = type;
entry->subtype = subtype;
entry->constructor = constructor;
this->mutex->lock(this->mutex);
this->constructors->insert_last(this->constructors, entry);
this->mutex->unlock(this->mutex);
}
/**
* Implementation of credential_factory_t.remove_builder.
*/
static void remove_builder(private_credential_factory_t *this,
builder_constructor_t constructor)
{
enumerator_t *enumerator;
entry_t *entry;
this->mutex->lock(this->mutex);
enumerator = this->constructors->create_enumerator(this->constructors);
while (enumerator->enumerate(enumerator, &entry))
{
if (entry->constructor == constructor)
{
this->constructors->remove_at(this->constructors, enumerator);
free(entry);
}
}
enumerator->destroy(enumerator);
this->mutex->unlock(this->mutex);
}
/**
* Implementation of credential_factory_t.create.
*/
static void* create(private_credential_factory_t *this, credential_type_t type,
int subtype, ...)
{
enumerator_t *enumerator;
builder_t *builder;
builder_part_t part;
va_list args;
void* construct = NULL;
enumerator = create_builder_enumerator(this, type, subtype);
while (enumerator->enumerate(enumerator, &builder))
{
va_start(args, subtype);
while (TRUE)
{
part = va_arg(args, builder_part_t);
switch (part)
{
case BUILD_END:
break;
case BUILD_BLOB_ASN1_DER:
case BUILD_SERIAL:
builder->add(builder, part, va_arg(args, chunk_t));
continue;
case BUILD_X509_FLAG:
builder->add(builder, part, va_arg(args, x509_flag_t));
continue;
case BUILD_KEY_SIZE:
builder->add(builder, part, va_arg(args, u_int));
continue;
case BUILD_NOT_BEFORE_TIME:
case BUILD_NOT_AFTER_TIME:
builder->add(builder, part, va_arg(args, time_t));
continue;
case BUILD_BLOB_ASN1_PEM:
case BUILD_FROM_FILE:
case BUILD_AGENT_SOCKET:
case BUILD_SIGNING_KEY:
case BUILD_PUBLIC_KEY:
case BUILD_SUBJECT:
case BUILD_SUBJECT_ALTNAME:
case BUILD_ISSUER:
case BUILD_ISSUER_ALTNAME:
case BUILD_SIGNING_CERT:
case BUILD_CA_CERT:
case BUILD_CERT:
case BUILD_IETF_GROUP_ATTR:
builder->add(builder, part, va_arg(args, void*));
continue;
/* no default to get a compiler warning */
}
break;
}
va_end(args);
construct = builder->build(builder);
if (construct)
{
break;
}
}
enumerator->destroy(enumerator);
if (!construct)
{
DBG1("failed to create a builder for credential type %N,"
" subtype (%d)", credential_type_names, type, subtype);
}
return construct;
}
/**
* Implementation of credential_factory_t.destroy
*/
static void destroy(private_credential_factory_t *this)
{
this->constructors->destroy_function(this->constructors, free);
this->mutex->destroy(this->mutex);
free(this);
}
/*
* see header file
*/
credential_factory_t *credential_factory_create()
{
private_credential_factory_t *this = malloc_thing(private_credential_factory_t);
this->public.create = (void*(*)(credential_factory_t*, credential_type_t type, int subtype, ...))create;
this->public.create_builder_enumerator = (enumerator_t*(*)(credential_factory_t*, credential_type_t type, int subtype))create_builder_enumerator;
this->public.add_builder = (void(*)(credential_factory_t*,credential_type_t type, int subtype, builder_constructor_t constructor))add_builder;
this->public.remove_builder = (void(*)(credential_factory_t*,builder_constructor_t constructor))remove_builder;
this->public.destroy = (void(*)(credential_factory_t*))destroy;
this->constructors = linked_list_create();
this->mutex = mutex_create(MUTEX_RECURSIVE);
return &this->public;
}
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