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