478 lines
16 KiB
PHP
478 lines
16 KiB
PHP
<?php
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// Copyright (c) 2015, Stanislav Humplik <sh@analogic.cz>
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the <organization> nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This file is copied from https://github.com/analogic/lescript
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// and modified to work without files and integrate in Froxlor
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class lescript
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{
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//public $ca = 'https://acme-v01.api.letsencrypt.org';
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public $ca = 'https://acme-staging.api.letsencrypt.org'; // testing
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public $license = 'https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf';
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public $countryCode = 'DE';
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public $state = "Germany";
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private $webRootDir;
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private $debugHandler;
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private $client;
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private $accountKey;
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public function __construct($webRootDir, $debugHandler)
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{
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$this->webRootDir = $webRootDir;
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$this->debugHandler = $debugHandler;
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$this->client = new Client($this->ca);
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}
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public function initAccount($certrow)
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{
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// Let's see if we have the private accountkey
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$this->accountKey = $certrow['leprivatekey'];
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if (!$this->accountKey || $this->accountKey == 'unset') {
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// generate and save new private key for account
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// ---------------------------------------------
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$this->log('Starting new account registration');
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$keys = $this->generateKey();
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$upd_stmt = Database::prepare("
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UPDATE `".TABLE_PANEL_CUSTOMERS."` SET `lepublickey` = :public, `leprivatekey` = :private WHERE `customerid` = :customerid;
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");
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Database::pexecute($upd_stmt, array('public' => $keys['public'], 'private' => $keys['private'], 'customerid' => $certrow['customerid']));
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$this->accountKey = $keys['private'];
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$this->postNewReg();
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$this->log('New account certificate registered');
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} else {
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$this->log('Account already registered. Continuing.');
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}
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}
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public function signDomains(array $domains, $domainkey = null)
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{
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if (!$this->accountKey) {
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throw new \RuntimeException("Account not initiated");
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}
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$this->log('Starting certificate generation process for domains');
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$privateAccountKey = openssl_pkey_get_private($this->accountKey);
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$accountKeyDetails = openssl_pkey_get_details($privateAccountKey);
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// start domains authentication
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// ----------------------------
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foreach($domains as $domain) {
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// 1. getting available authentication options
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// -------------------------------------------
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$this->log("Requesting challenge for $domain");
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$response = $this->signedRequest(
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"/acme/new-authz",
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array("resource" => "new-authz", "identifier" => array("type" => "dns", "value" => $domain))
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);
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// choose http-01 challange only
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$challenge = array_reduce($response['challenges'], function($v, $w) { return $v ? $v : ($w['type'] == 'http-01' ? $w : false); });
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if(!$challenge) throw new \RuntimeException("HTTP Challenge for $domain is not available. Whole response: ".json_encode($response));
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$this->log("Got challenge token for $domain");
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$location = $this->client->getLastLocation();
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// 2. saving authentication token for web verification
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// ---------------------------------------------------
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$directory = $this->webRootDir.'/.well-known/acme-challenge';
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$tokenPath = $directory.'/'.$challenge['token'];
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if(!file_exists($directory) && !@mkdir($directory, 0755, true)) {
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throw new \RuntimeException("Couldn't create directory to expose challenge: ${tokenPath}");
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}
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$header = array(
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// need to be in precise order!
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"e" => Base64UrlSafeEncoder::encode($accountKeyDetails["rsa"]["e"]),
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"kty" => "RSA",
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"n" => Base64UrlSafeEncoder::encode($accountKeyDetails["rsa"]["n"])
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);
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$payload = $challenge['token'] . '.' . Base64UrlSafeEncoder::encode(hash('sha256', json_encode($header), true));
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file_put_contents($tokenPath, $payload);
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chmod($tokenPath, 0644);
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// 3. verification process itself
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// -------------------------------
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$uri = "http://${domain}/.well-known/acme-challenge/${challenge['token']}";
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$this->log("Token for $domain saved at $tokenPath and should be available at $uri");
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// simple self check
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if($payload !== trim(@file_get_contents($uri))) {
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throw new \RuntimeException("Please check $uri - token not available");
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}
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$this->log("Sending request to challenge");
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// send request to challenge
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$result = $this->signedRequest(
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$challenge['uri'],
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array(
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"resource" => "challenge",
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"type" => "http-01",
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"keyAuthorization" => $payload,
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"token" => $challenge['token']
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)
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);
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// waiting loop
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// we wait for a maximum of 30 seconds to avoid endless loops
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$count = 0;
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do {
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if(empty($result['status']) || $result['status'] == "invalid") {
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throw new \RuntimeException("Verification ended with error: ".json_encode($result));
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}
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$ended = !($result['status'] === "pending");
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if(!$ended) {
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$this->log("Verification pending, sleeping 1s");
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sleep(1);
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$count++;
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}
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$result = $this->client->get($location);
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} while (!$ended && $count < 30);
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$this->log("Verification ended with status: ${result['status']}");
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@unlink($tokenPath);
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}
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// requesting certificate
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// ----------------------
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// generate private key for domain if not exist
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if(!is_null($domainkey)) {
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$keys = $this->generateKey();
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$domainkey = $keys['private'];
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}
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// load domain key
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$privateDomainKey = openssl_pkey_get_private($domainkey);
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$this->client->getLastLinks();
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// request certificates creation
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$result = $this->signedRequest(
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"/acme/new-cert",
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array('resource' => 'new-cert', 'csr' => $this->generateCSR($privateDomainKey, $domains))
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);
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if ($this->client->getLastCode() !== 201) {
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throw new \RuntimeException("Invalid response code: ".$this->client->getLastCode().", ".json_encode($result));
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}
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$location = $this->client->getLastLocation();
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// waiting loop
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$certificates = array();
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while(1) {
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$this->client->getLastLinks();
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$result = $this->client->get($location);
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if($this->client->getLastCode() == 202) {
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$this->log("Certificate generation pending, sleeping 1s");
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sleep(1);
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} else if ($this->client->getLastCode() == 200) {
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$this->log("Got certificate! YAY!");
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$certificates[] = $this->parsePemFromBody($result);
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foreach($this->client->getLastLinks() as $link) {
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$this->log("Requesting chained cert at $link");
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$result = $this->client->get($link);
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$certificates[] = $this->parsePemFromBody($result);
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}
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break;
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} else {
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throw new \RuntimeException("Can't get certificate: HTTP code ".$this->client->getLastCode());
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}
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}
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if(empty($certificates)) throw new \RuntimeException('No certificates generated');
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$fullchain = implode("\n", $certificates);
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$crt = array_shift($certificates);
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$chain = implode("\n", $certificates);
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$this->log("Done, returning new certificates and key");
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return array('fullchain' => $fullchain, 'crt' => $crt, 'chain' => $chain, 'key' => $privateDomainKey);
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}
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private function parsePemFromBody($body)
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{
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$pem = chunk_split(base64_encode($body), 64, "\n");
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return "-----BEGIN CERTIFICATE-----\n" . $pem . "-----END CERTIFICATE-----\n";
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}
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private function postNewReg()
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{
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$this->log('Sending registration to letsencrypt server');
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return $this->signedRequest(
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'/acme/new-reg',
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array('resource' => 'new-reg', 'agreement' => $this->license)
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);
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}
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private function generateCSR($privateKey, array $domains)
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{
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$domain = reset($domains);
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$san = implode(",", array_map(function ($dns) { return "DNS:" . $dns; }, $domains));
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$tmpConf = tmpfile();
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$tmpConfMeta = stream_get_meta_data($tmpConf);
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$tmpConfPath = $tmpConfMeta["uri"];
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// workaround to get SAN working
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fwrite($tmpConf,
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'HOME = .
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RANDFILE = $ENV::HOME/.rnd
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[ req ]
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default_bits = 2048
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default_keyfile = privkey.pem
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distinguished_name = req_distinguished_name
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req_extensions = v3_req
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[ req_distinguished_name ]
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countryName = Country Name (2 letter code)
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[ v3_req ]
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basicConstraints = CA:FALSE
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subjectAltName = '.$san.'
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keyUsage = nonRepudiation, digitalSignature, keyEncipherment');
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$csr = openssl_csr_new(
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array(
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"CN" => $domain,
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"ST" => $this->state,
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"C" => $this->countryCode,
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"O" => "Unknown",
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),
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$privateKey,
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array(
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"config" => $tmpConfPath,
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"digest_alg" => "sha256"
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)
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);
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if (!$csr) throw new \RuntimeException("CSR couldn't be generated! ".openssl_error_string());
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openssl_csr_export($csr, $csr);
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fclose($tmpConf);
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preg_match('~REQUEST-----(.*)-----END~s', $csr, $matches);
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return trim(Base64UrlSafeEncoder::encode(base64_decode($matches[1])));
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}
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private function generateKey()
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{
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$res = openssl_pkey_new(array(
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"private_key_type" => OPENSSL_KEYTYPE_RSA,
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"private_key_bits" => 4096,
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));
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if(!openssl_pkey_export($res, $privateKey)) {
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throw new \RuntimeException("Key export failed!");
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}
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$details = openssl_pkey_get_details($res);
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return array('private' => $privateKey, 'public' => $details['key']);
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}
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private function signedRequest($uri, array $payload)
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{
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$privateKey = openssl_pkey_get_private($this->accountKey);
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$details = openssl_pkey_get_details($privateKey);
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$header = array(
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"alg" => "RS256",
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"jwk" => array(
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"kty" => "RSA",
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"n" => Base64UrlSafeEncoder::encode($details["rsa"]["n"]),
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"e" => Base64UrlSafeEncoder::encode($details["rsa"]["e"]),
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)
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);
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$protected = $header;
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$protected["nonce"] = $this->client->getLastNonce();
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$payload64 = Base64UrlSafeEncoder::encode(str_replace('\\/', '/', json_encode($payload)));
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$protected64 = Base64UrlSafeEncoder::encode(json_encode($protected));
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openssl_sign($protected64.'.'.$payload64, $signed, $privateKey, "SHA256");
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$signed64 = Base64UrlSafeEncoder::encode($signed);
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$data = array(
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'header' => $header,
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'protected' => $protected64,
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'payload' => $payload64,
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'signature' => $signed64
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);
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$this->log("Sending signed request to $uri");
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return $this->client->post($uri, json_encode($data));
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}
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protected function log($message)
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{
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fwrite($this->debugHandler, 'letsencrypt ' . $message . "\n");
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}
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}
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class Client
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{
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private $lastCode;
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private $lastHeader;
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private $base;
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public function __construct($base)
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{
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$this->base = $base;
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}
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private function curl($method, $url, $data = null)
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{
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$headers = array('Accept: application/json', 'Content-Type: application/json');
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$handle = curl_init();
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curl_setopt($handle, CURLOPT_URL, preg_match('~^http~', $url) ? $url : $this->base.$url);
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curl_setopt($handle, CURLOPT_HTTPHEADER, $headers);
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curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($handle, CURLOPT_HEADER, true);
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// DO NOT DO THAT!
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// curl_setopt($handle, CURLOPT_SSL_VERIFYHOST, false);
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// curl_setopt($handle, CURLOPT_SSL_VERIFYPEER, false);
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switch ($method) {
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case 'GET':
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break;
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case 'POST':
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curl_setopt($handle, CURLOPT_POST, true);
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curl_setopt($handle, CURLOPT_POSTFIELDS, $data);
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break;
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}
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$response = curl_exec($handle);
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if(curl_errno($handle)) {
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throw new \RuntimeException('Curl: '.curl_error($handle));
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}
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$header_size = curl_getinfo($handle, CURLINFO_HEADER_SIZE);
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$header = substr($response, 0, $header_size);
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$body = substr($response, $header_size);
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$this->lastHeader = $header;
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$this->lastCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
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$data = json_decode($body, true);
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return $data === null ? $body : $data;
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}
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public function post($url, $data)
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{
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return $this->curl('POST', $url, $data);
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}
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public function get($url)
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{
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return $this->curl('GET', $url);
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}
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public function getLastNonce()
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{
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if(preg_match('~Replay\-Nonce: (.+)~i', $this->lastHeader, $matches)) {
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return trim($matches[1]);
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}
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$this->curl('GET', '/directory');
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return $this->getLastNonce();
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}
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public function getLastLocation()
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{
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if(preg_match('~Location: (.+)~i', $this->lastHeader, $matches)) {
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return trim($matches[1]);
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}
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return null;
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}
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public function getLastCode()
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{
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return $this->lastCode;
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}
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public function getLastLinks()
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{
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preg_match_all('~Link: <(.+)>;rel="up"~', $this->lastHeader, $matches);
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return $matches[1];
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}
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}
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class Base64UrlSafeEncoder
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{
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public static function encode($input)
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{
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return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
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}
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public static function decode($input)
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{
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$remainder = strlen($input) % 4;
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if ($remainder) {
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$padlen = 4 - $remainder;
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$input .= str_repeat('=', $padlen);
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}
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return base64_decode(strtr($input, '-_', '+/'));
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}
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}
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