Andreas Steffen
2b233c8a64
The tpm plugin can be used to derive true random numbers from a TPM 2.0 device. The get_random method must be explicitly enabled in strongswan.conf with the plugin.tpm.use_rng = yes option.
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/*
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* Copyright (C) 2017 Andreas Steffen
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* HSR 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 "tpm_plugin.h"
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#include "tpm_private_key.h"
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#include "tpm_rng.h"
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#include <library.h>
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typedef struct private_tpm_plugin_t private_tpm_plugin_t;
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/**
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* private data of tpm_plugin
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*/
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struct private_tpm_plugin_t {
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/**
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* public functions
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*/
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tpm_plugin_t public;
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};
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METHOD(plugin_t, get_name, char*,
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private_tpm_plugin_t *this)
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{
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return "tpm";
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}
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METHOD(plugin_t, get_features, int,
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private_tpm_plugin_t *this, plugin_feature_t *features[])
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{
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static plugin_feature_t f_rng[] = {
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PLUGIN_REGISTER(RNG, tpm_rng_create),
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PLUGIN_PROVIDE(RNG, RNG_STRONG),
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PLUGIN_PROVIDE(RNG, RNG_TRUE),
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};
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static plugin_feature_t f_privkey[] = {
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PLUGIN_REGISTER(PRIVKEY, tpm_private_key_connect, FALSE),
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PLUGIN_PROVIDE(PRIVKEY, KEY_ANY),
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};
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static plugin_feature_t f[countof(f_rng) + countof(f_privkey)] = {};
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static int count = 0;
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if (!count)
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{
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plugin_features_add(f, f_privkey, countof(f_privkey), &count);
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if (lib->settings->get_bool(lib->settings,
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"%s.plugins.tpm.use_rng", FALSE, lib->ns))
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{
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plugin_features_add(f, f_rng, countof(f_rng), &count);
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}
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}
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*features = f;
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return count;
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}
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METHOD(plugin_t, destroy, void,
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private_tpm_plugin_t *this)
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{
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free(this);
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}
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/*
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* see header file
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*/
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plugin_t *tpm_plugin_create()
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{
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private_tpm_plugin_t *this;
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INIT(this,
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.public = {
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.plugin = {
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.get_name = _get_name,
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.get_features = _get_features,
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.destroy = _destroy,
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},
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},
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);
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return &this->public.plugin;
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}
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