354 lines
15 KiB
PHP
354 lines
15 KiB
PHP
<?php
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/*
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* This file is part of composer/ca-bundle.
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*
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* (c) Composer <https://github.com/composer>
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*
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* For the full copyright and license information, please view
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* the LICENSE file that was distributed with this source code.
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*/
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namespace Composer\CaBundle;
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use Psr\Log\LoggerInterface;
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use Symfony\Component\Process\PhpProcess;
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/**
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* @author Chris Smith <chris@cs278.org>
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* @author Jordi Boggiano <j.boggiano@seld.be>
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*/
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class CaBundle
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{
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/** @var string|null */
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private static $caPath;
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/** @var array<string, bool> */
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private static $caFileValidity = array();
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/** @var bool|null */
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private static $useOpensslParse;
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/**
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* Returns the system CA bundle path, or a path to the bundled one
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*
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* This method was adapted from Sslurp.
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* https://github.com/EvanDotPro/Sslurp
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*
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* (c) Evan Coury <me@evancoury.com>
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*
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* For the full copyright and license information, please see below:
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*
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* Copyright (c) 2013, Evan Coury
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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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 THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY 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 ON
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* 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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*
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* @param LoggerInterface $logger optional logger for information about which CA files were loaded
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* @return string path to a CA bundle file or directory
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*/
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public static function getSystemCaRootBundlePath(LoggerInterface $logger = null)
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{
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if (self::$caPath !== null) {
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return self::$caPath;
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}
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$caBundlePaths = array();
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// If SSL_CERT_FILE env variable points to a valid certificate/bundle, use that.
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// This mimics how OpenSSL uses the SSL_CERT_FILE env variable.
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$caBundlePaths[] = self::getEnvVariable('SSL_CERT_FILE');
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// If SSL_CERT_DIR env variable points to a valid certificate/bundle, use that.
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// This mimics how OpenSSL uses the SSL_CERT_FILE env variable.
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$caBundlePaths[] = self::getEnvVariable('SSL_CERT_DIR');
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$caBundlePaths[] = ini_get('openssl.cafile');
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$caBundlePaths[] = ini_get('openssl.capath');
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$otherLocations = array(
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'/etc/pki/tls/certs/ca-bundle.crt', // Fedora, RHEL, CentOS (ca-certificates package)
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'/etc/ssl/certs/ca-certificates.crt', // Debian, Ubuntu, Gentoo, Arch Linux (ca-certificates package)
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'/etc/ssl/ca-bundle.pem', // SUSE, openSUSE (ca-certificates package)
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'/usr/local/share/certs/ca-root-nss.crt', // FreeBSD (ca_root_nss_package)
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'/usr/ssl/certs/ca-bundle.crt', // Cygwin
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'/opt/local/share/curl/curl-ca-bundle.crt', // OS X macports, curl-ca-bundle package
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'/usr/local/share/curl/curl-ca-bundle.crt', // Default cURL CA bunde path (without --with-ca-bundle option)
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'/usr/share/ssl/certs/ca-bundle.crt', // Really old RedHat?
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'/etc/ssl/cert.pem', // OpenBSD
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'/usr/local/etc/ssl/cert.pem', // FreeBSD 10.x
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'/usr/local/etc/openssl/cert.pem', // OS X homebrew, openssl package
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'/usr/local/etc/openssl@1.1/cert.pem', // OS X homebrew, openssl@1.1 package
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);
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foreach($otherLocations as $location) {
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$otherLocations[] = dirname($location);
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}
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$caBundlePaths = array_merge($caBundlePaths, $otherLocations);
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foreach ($caBundlePaths as $caBundle) {
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if ($caBundle && self::caFileUsable($caBundle, $logger)) {
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return self::$caPath = $caBundle;
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}
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if ($caBundle && self::caDirUsable($caBundle)) {
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return self::$caPath = $caBundle;
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}
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}
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return self::$caPath = static::getBundledCaBundlePath(); // Bundled CA file, last resort
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}
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/**
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* Returns the path to the bundled CA file
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*
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* In case you don't want to trust the user or the system, you can use this directly
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*
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* @return string path to a CA bundle file
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*/
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public static function getBundledCaBundlePath()
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{
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$caBundleFile = __DIR__.'/../res/cacert.pem';
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// cURL does not understand 'phar://' paths
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// see https://github.com/composer/ca-bundle/issues/10
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if (0 === strpos($caBundleFile, 'phar://')) {
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$tempCaBundleFile = tempnam(sys_get_temp_dir(), 'openssl-ca-bundle-');
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if (false === $tempCaBundleFile) {
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throw new \RuntimeException('Could not create a temporary file to store the bundled CA file');
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}
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file_put_contents(
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$tempCaBundleFile,
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file_get_contents($caBundleFile)
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);
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register_shutdown_function(function() use ($tempCaBundleFile) {
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@unlink($tempCaBundleFile);
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});
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$caBundleFile = $tempCaBundleFile;
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}
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return $caBundleFile;
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}
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/**
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* Validates a CA file using opensl_x509_parse only if it is safe to use
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*
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* @param string $filename
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* @param LoggerInterface $logger optional logger for information about which CA files were loaded
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*
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* @return bool
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*/
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public static function validateCaFile($filename, LoggerInterface $logger = null)
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{
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static $warned = false;
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if (isset(self::$caFileValidity[$filename])) {
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return self::$caFileValidity[$filename];
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}
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$contents = file_get_contents($filename);
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// assume the CA is valid if php is vulnerable to
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// https://www.sektioneins.de/advisories/advisory-012013-php-openssl_x509_parse-memory-corruption-vulnerability.html
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if (!static::isOpensslParseSafe()) {
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if (!$warned && $logger) {
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$logger->warning(sprintf(
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'Your version of PHP, %s, is affected by CVE-2013-6420 and cannot safely perform certificate validation, we strongly suggest you upgrade.',
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PHP_VERSION
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));
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$warned = true;
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}
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$isValid = !empty($contents);
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} elseif (is_string($contents) && strlen($contents) > 0) {
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$contents = preg_replace("/^(\\-+(?:BEGIN|END))\\s+TRUSTED\\s+(CERTIFICATE\\-+)\$/m", '$1 $2', $contents);
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if (null === $contents) {
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// regex extraction failed
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$isValid = false;
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} else {
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$isValid = (bool) openssl_x509_parse($contents);
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}
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} else {
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$isValid = false;
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}
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if ($logger) {
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$logger->debug('Checked CA file '.realpath($filename).': '.($isValid ? 'valid' : 'invalid'));
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}
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return self::$caFileValidity[$filename] = $isValid;
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}
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/**
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* Test if it is safe to use the PHP function openssl_x509_parse().
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*
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* This checks if OpenSSL extensions is vulnerable to remote code execution
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* via the exploit documented as CVE-2013-6420.
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*
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* @return bool
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*/
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public static function isOpensslParseSafe()
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{
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if (null !== self::$useOpensslParse) {
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return self::$useOpensslParse;
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}
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if (PHP_VERSION_ID >= 50600) {
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return self::$useOpensslParse = true;
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}
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// Vulnerable:
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// PHP 5.3.0 - PHP 5.3.27
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// PHP 5.4.0 - PHP 5.4.22
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// PHP 5.5.0 - PHP 5.5.6
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if (
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(PHP_VERSION_ID < 50400 && PHP_VERSION_ID >= 50328)
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|| (PHP_VERSION_ID < 50500 && PHP_VERSION_ID >= 50423)
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|| PHP_VERSION_ID >= 50507
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) {
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// This version of PHP has the fix for CVE-2013-6420 applied.
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return self::$useOpensslParse = true;
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}
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if (defined('PHP_WINDOWS_VERSION_BUILD')) {
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// Windows is probably insecure in this case.
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return self::$useOpensslParse = false;
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}
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$compareDistroVersionPrefix = function ($prefix, $fixedVersion) {
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$regex = '{^'.preg_quote($prefix).'([0-9]+)$}';
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if (preg_match($regex, PHP_VERSION, $m)) {
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return ((int) $m[1]) >= $fixedVersion;
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}
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return false;
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};
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// Hard coded list of PHP distributions with the fix backported.
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if (
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$compareDistroVersionPrefix('5.3.3-7+squeeze', 18) // Debian 6 (Squeeze)
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|| $compareDistroVersionPrefix('5.4.4-14+deb7u', 7) // Debian 7 (Wheezy)
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|| $compareDistroVersionPrefix('5.3.10-1ubuntu3.', 9) // Ubuntu 12.04 (Precise)
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) {
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return self::$useOpensslParse = true;
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}
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// Symfony Process component is missing so we assume it is unsafe at this point
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if (!class_exists('Symfony\Component\Process\PhpProcess')) {
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return self::$useOpensslParse = false;
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}
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// This is where things get crazy, because distros backport security
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// fixes the chances are on NIX systems the fix has been applied but
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// it's not possible to verify that from the PHP version.
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//
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// To verify exec a new PHP process and run the issue testcase with
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// known safe input that replicates the bug.
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// Based on testcase in https://github.com/php/php-src/commit/c1224573c773b6845e83505f717fbf820fc18415
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// changes in https://github.com/php/php-src/commit/76a7fd893b7d6101300cc656058704a73254d593
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$cert = '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';
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$script = <<<'EOT'
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error_reporting(-1);
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$info = openssl_x509_parse(base64_decode('%s'));
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var_dump(PHP_VERSION, $info['issuer']['emailAddress'], $info['validFrom_time_t']);
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EOT;
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$script = '<'."?php\n".sprintf($script, $cert);
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try {
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$process = new PhpProcess($script);
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$process->mustRun();
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} catch (\Exception $e) {
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// In the case of any exceptions just accept it is not possible to
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// determine the safety of openssl_x509_parse and bail out.
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return self::$useOpensslParse = false;
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}
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$output = preg_split('{\r?\n}', trim($process->getOutput()));
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$errorOutput = trim($process->getErrorOutput());
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if (
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is_array($output)
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&& count($output) === 3
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&& $output[0] === sprintf('string(%d) "%s"', strlen(PHP_VERSION), PHP_VERSION)
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&& $output[1] === 'string(27) "stefan.esser@sektioneins.de"'
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&& $output[2] === 'int(-1)'
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&& preg_match('{openssl_x509_parse\(\): illegal (?:ASN1 data type for|length in) timestamp in - on line \d+}', $errorOutput)
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) {
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// This PHP has the fix backported probably by a distro security team.
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return self::$useOpensslParse = true;
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}
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return self::$useOpensslParse = false;
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}
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/**
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* Resets the static caches
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* @return void
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*/
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public static function reset()
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{
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self::$caFileValidity = array();
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self::$caPath = null;
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self::$useOpensslParse = null;
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}
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/**
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* @param string $name
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* @return string|false
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*/
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private static function getEnvVariable($name)
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{
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if (isset($_SERVER[$name])) {
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return (string) $_SERVER[$name];
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}
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if (PHP_SAPI === 'cli' && ($value = getenv($name)) !== false && $value !== null) {
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return (string) $value;
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}
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return false;
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}
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/**
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* @param string|false $certFile
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* @return bool
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*/
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private static function caFileUsable($certFile, LoggerInterface $logger = null)
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{
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return $certFile && @is_file($certFile) && @is_readable($certFile) && static::validateCaFile($certFile, $logger);
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}
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/**
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* @param string|false $certDir
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* @return bool
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*/
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private static function caDirUsable($certDir)
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{
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return $certDir && @is_dir($certDir) && @is_readable($certDir) && glob($certDir . '/*');
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}
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}
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