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<?php
namespace WPLEClient;
use Exception;
use WPLEClient\Exceptions\LEFunctionsException;
/**
* LetsEncrypt Functions class, supplying the LetsEncrypt Client with supportive functions.
*
* PHP version 5.2.0
*
* MIT License
*
* Copyright (c) 2018 Youri van Weegberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* @author Youri van Weegberg <youri@yourivw.nl>
* @copyright 2018 Youri van Weegberg
* @license https://opensource.org/licenses/mit-license.php MIT License
* @link https://github.com/yourivw/LEClient
* @since Class available since Release 1.0.0
*/
class LEFunctions
{
/**
* Generates a new RSA keypair and saves both keys to a new file.
*
* @param string $directory The directory in which to store the new keys. If set to null or empty string - privateKeyFile and publicKeyFile will be treated as absolute paths.
* @param string $privateKeyFile The filename for the private key file.
* @param string $publicKeyFile The filename for the public key file.
* @param string $keySize RSA key size, must be between 2048 and 4096 (default is 4096)
*/
public static function RSAGenerateKeys($directory, $privateKeyFile = 'private.pem', $publicKeyFile = 'public.pem', $keySize = 4096)
{
if ($keySize < 2048 || $keySize > 4096) throw LEFunctionsException::InvalidArgumentException('RSA key size must be between 2048 and 4096.');
$res = openssl_pkey_new(array(
"private_key_type" => OPENSSL_KEYTYPE_RSA,
"private_key_bits" => intval($keySize),
));
if ($res === false) {
$error = "Could not generate key pair! Check your OpenSSL configuration. OpenSSL Error: " . PHP_EOL;
while ($message = openssl_error_string()) {
$error .= $message . PHP_EOL;
}
throw LEFunctionsException::GenerateKeypairException($error);
}
if (!openssl_pkey_export($res, $privateKey)) {
$error = "RSA keypair export failed!! Error: " . PHP_EOL;
while ($message = openssl_error_string()) {
$error .= $message . PHP_EOL;
}
throw LEFunctionsException::GenerateKeypairException($error);
}
$details = openssl_pkey_get_details($res);
if ($directory !== null && $directory !== '') {
$privateKeyFile = $directory . $privateKeyFile;
$publicKeyFile = $directory . $publicKeyFile;
}
file_put_contents($privateKeyFile, $privateKey);
file_put_contents($publicKeyFile, $details['key']);
openssl_pkey_free($res);
}
/**
* Generates a new EC prime256v1 keypair and saves both keys to a new file.
*
* @param string $directory The directory in which to store the new keys. If set to null or empty string - privateKeyFile and publicKeyFile will be treated as absolute paths.
* @param string $privateKeyFile The filename for the private key file.
* @param string $publicKeyFile The filename for the public key file.
* @param string $keysize EC key size, possible values are 256 (prime256v1) or 384 (secp384r1), default is 256
*/
public static function ECGenerateKeys($directory, $privateKeyFile = 'private.pem', $publicKeyFile = 'public.pem', $keySize = 256)
{
if (version_compare(PHP_VERSION, '7.1.0') == -1) throw LEFunctionsException::PHPVersionException();
if ($keySize == 256) {
$res = openssl_pkey_new(array(
"private_key_type" => OPENSSL_KEYTYPE_EC,
"curve_name" => "prime256v1",
));
} elseif ($keySize == 384) {
$res = openssl_pkey_new(array(
"private_key_type" => OPENSSL_KEYTYPE_EC,
"curve_name" => "secp384r1",
));
} else throw LEFunctionsException::InvalidArgumentException('EC key size must be 256 or 384.');
if (!openssl_pkey_export($res, $privateKey)) throw LEFunctionsException::GenerateKeypairException('EC keypair export failed!');
$details = openssl_pkey_get_details($res);
if ($directory !== null && $directory !== '') {
$privateKeyFile = $directory . $privateKeyFile;
$publicKeyFile = $directory . $publicKeyFile;
}
file_put_contents($privateKeyFile, $privateKey);
file_put_contents($publicKeyFile, $details['key']);
openssl_pkey_free($res);
}
/**
* Encodes a string input to a base64 encoded string which is URL safe.
*
* @param string $input The input string to encode.
*
* @return string Returns a URL safe base64 encoded string.
*/
public static function Base64UrlSafeEncode($input)
{
return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
}
/**
* Decodes a string that is URL safe base64 encoded.
*
* @param string $input The encoded input string to decode.
*
* @return string Returns the decoded input string.
*/
public static function Base64UrlSafeDecode($input)
{
$remainder = strlen($input) % 4;
if ($remainder) {
$padlen = 4 - $remainder;
$input .= str_repeat('=', $padlen);
}
return base64_decode(strtr($input, '-_', '+/'));
}
/**
* Outputs a log message.
*
* @param object $data The data to print.
* @param string $function The function name to print above. Defaults to the calling function's name from the stacktrace. (optional)
*/
public static function log($data, $function = '')
{
$handle = fopen(WPLE_DEBUGGER . 'debug.log', 'a');
$log = "[" . date('d-m-Y H:i:s') . "] :\n";
$log .= $data . "\n\n";
fwrite($handle, $log);
fclose($handle);
}
/**
* Makes a request to the HTTP challenge URL and checks whether the authorization is valid for the given $domain.
*
* @param string $domain The domain to check the authorization for.
* @param string $token The token (filename) to request.
* @param string $keyAuthorization the keyAuthorization (file content) to compare.
*
* @return boolean Returns true if the challenge is valid, false if not.
*/
public static function checkHTTPChallenge($domain, $token, $keyAuthorization, $returncode = false)
{
if (!stripos($domain, 'http')) {
$domain = 'http://' . $domain;
} else {
$domain = str_ireplace('https:', 'http:', $domain);
}
$requestURL = $domain . '/.well-known/acme-challenge/' . $token;
if (!function_exists('curl_init')) {
return false;
}
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => $requestURL,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_MAXREDIRS => 5,
CURLOPT_TIMEOUT => 90,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_SSL_VERIFYHOST => false,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
//CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36'
));
$response = trim(curl_exec($curl));
//$final_url = curl_getinfo($curl, CURLINFO_EFFECTIVE_URL);
$httpcode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
curl_close($curl);
if (!empty($response) && $response == $keyAuthorization) {
return true;
} else {
//if(FALSE !== stripos($final_url, 'public_html')){
//LEFunctions::log("Could not verify challenge code in above http challenge file. Trying again with advanced technique!.\n");
//}
if ($returncode) {
return $httpcode;
}
return false;
}
}
/**
* Checks whether the applicable DNS TXT record is a valid authorization for the given $domain.
*
* @param string $domain The domain to check the authorization for.
* @param string $DNSDigest The digest to compare the DNS record to.
*
* @return boolean Returns true if the challenge is valid, false if not.
*/
public static function checkDNSChallenge($domain, $DNSDigest)
{
$requestURL = 'https://dns.google.com/resolve?name=_acme-challenge.' . $domain . '&type=TXT';
$handle = curl_init();
curl_setopt($handle, CURLOPT_URL, $requestURL);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
curl_setopt($handle, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($handle, CURLOPT_SSL_VERIFYPEER, false);
$response = json_decode(trim(curl_exec($handle)));
if ($response->Status === 0 && isset($response->Answer)) {
foreach ($response->Answer as $answer) {
if ($answer->type === 16) {
if (str_ireplace('"', '', $answer->data) === $DNSDigest || $answer->data === $DNSDigest) return true;
}
}
}
return false;
}
/**
* Creates a simple .htaccess file in $directory which denies from all.
*
* @param string $directory The directory in which to put the .htaccess file.
*/
public static function createhtaccess($directory)
{
$htaccess = '<ifModule mod_authz_core.c>' . "\n"
. ' Require all denied' . "\n"
. ' <FilesMatch ^>' . "\n"
. ' Require all denied' . "\n"
. ' </FilesMatch>' . "\n"
. '</ifModule>' . "\n"
. '<ifModule !mod_authz_core.c>' . "\n"
. ' Deny from all' . "\n"
. ' <FilesMatch ^>' . "\n"
. ' Deny from all' . "\n"
. ' </FilesMatch>' . "\n"
. '</ifModule>' . "\n";
file_put_contents($directory . '.htaccess', $htaccess);
}
}