143 lines
3.5 KiB
PHP
143 lines
3.5 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016 Lukas Reschke <lukas@statuscode.ch>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\Security\IdentityProof;
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use OC\Files\AppData\Factory;
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use OCP\Files\IAppData;
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use OCP\IConfig;
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use OCP\IUser;
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use OCP\Security\ICrypto;
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class Manager {
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/** @var IAppData */
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private $appData;
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/** @var ICrypto */
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private $crypto;
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/** @var IConfig */
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private $config;
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/**
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* @param Factory $appDataFactory
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* @param ICrypto $crypto
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* @param IConfig $config
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*/
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public function __construct(Factory $appDataFactory,
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ICrypto $crypto,
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IConfig $config
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) {
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$this->appData = $appDataFactory->get('identityproof');
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$this->crypto = $crypto;
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$this->config = $config;
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}
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/**
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* Calls the openssl functions to generate a public and private key.
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* In a separate function for unit testing purposes.
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*
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* @return array [$publicKey, $privateKey]
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*/
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protected function generateKeyPair() {
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$config = [
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'digest_alg' => 'sha512',
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'private_key_bits' => 2048,
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];
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// Generate new key
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$res = openssl_pkey_new($config);
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openssl_pkey_export($res, $privateKey);
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// Extract the public key from $res to $pubKey
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$publicKey = openssl_pkey_get_details($res);
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$publicKey = $publicKey['key'];
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return [$publicKey, $privateKey];
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}
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/**
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* Generate a key for a given ID
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* Note: If a key already exists it will be overwritten
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*
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* @param string $id key id
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* @return Key
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*/
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protected function generateKey($id) {
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list($publicKey, $privateKey) = $this->generateKeyPair();
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// Write the private and public key to the disk
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try {
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$this->appData->newFolder($id);
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} catch (\Exception $e) {}
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$folder = $this->appData->getFolder($id);
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$folder->newFile('private')
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->putContent($this->crypto->encrypt($privateKey));
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$folder->newFile('public')
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->putContent($publicKey);
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return new Key($publicKey, $privateKey);
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}
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/**
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* Get key for a specific id
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*
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* @param string $id
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* @return Key
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*/
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protected function retrieveKey($id) {
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try {
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$folder = $this->appData->getFolder($id);
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$privateKey = $this->crypto->decrypt(
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$folder->getFile('private')->getContent()
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);
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$publicKey = $folder->getFile('public')->getContent();
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return new Key($publicKey, $privateKey);
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} catch (\Exception $e) {
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return $this->generateKey($id);
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}
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}
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/**
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* Get public and private key for $user
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*
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* @param IUser $user
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* @return Key
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*/
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public function getKey(IUser $user) {
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$uid = $user->getUID();
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return $this->retrieveKey('user-' . $uid);
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}
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/**
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* Get instance wide public and private key
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*
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* @return Key
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* @throws \RuntimeException
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*/
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public function getSystemKey() {
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$instanceId = $this->config->getSystemValue('instanceid', null);
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if ($instanceId === null) {
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throw new \RuntimeException('no instance id!');
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}
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return $this->retrieveKey('system-' . $instanceId);
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}
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}
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