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437 lines
14 KiB
PHP
437 lines
14 KiB
PHP
<?php
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/*
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* This file is part of SwiftMailer.
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* (c) 2004-2009 Chris Corbyn
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* MIME Message Signer used to apply S/MIME Signature/Encryption to a message.
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*
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*
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* @author Romain-Geissler
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* @author Sebastiaan Stok <s.stok@rollerscapes.net>
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*/
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class Swift_Signers_SMimeSigner implements Swift_Signers_BodySigner
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{
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protected $signCertificate;
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protected $signPrivateKey;
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protected $encryptCert;
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protected $signThenEncrypt = true;
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protected $signLevel;
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protected $encryptLevel;
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protected $signOptions;
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protected $encryptOptions;
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protected $encryptCipher;
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protected $extraCerts = null;
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/**
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* @var Swift_StreamFilters_StringReplacementFilterFactory
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*/
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protected $replacementFactory;
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/**
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* @var Swift_Mime_HeaderFactory
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*/
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protected $headerFactory;
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/**
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* Constructor.
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*
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* @param string|null $signCertificate
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* @param string|null $signPrivateKey
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* @param string|null $encryptCertificate
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*/
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public function __construct($signCertificate = null, $signPrivateKey = null, $encryptCertificate = null)
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{
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if (null !== $signPrivateKey) {
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$this->setSignCertificate($signCertificate, $signPrivateKey);
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}
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if (null !== $encryptCertificate) {
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$this->setEncryptCertificate($encryptCertificate);
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}
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$this->replacementFactory = Swift_DependencyContainer::getInstance()
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->lookup('transport.replacementfactory');
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$this->signOptions = PKCS7_DETACHED;
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// Supported since php5.4
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if (defined('OPENSSL_CIPHER_AES_128_CBC')) {
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$this->encryptCipher = OPENSSL_CIPHER_AES_128_CBC;
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} else {
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$this->encryptCipher = OPENSSL_CIPHER_RC2_128;
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}
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}
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/**
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* Returns an new Swift_Signers_SMimeSigner instance.
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*
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* @param string $certificate
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* @param string $privateKey
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*
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* @return Swift_Signers_SMimeSigner
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*/
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public static function newInstance($certificate = null, $privateKey = null)
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{
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return new self($certificate, $privateKey);
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}
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/**
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* Set the certificate location to use for signing.
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*
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* @link http://www.php.net/manual/en/openssl.pkcs7.flags.php
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*
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* @param string $certificate
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* @param string|array $privateKey If the key needs an passphrase use array('file-location', 'passphrase') instead
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* @param int $signOptions Bitwise operator options for openssl_pkcs7_sign()
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* @param string $extraCerts A file containing intermediate certificates needed by the signing certificate
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*
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* @return Swift_Signers_SMimeSigner
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*/
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public function setSignCertificate($certificate, $privateKey = null, $signOptions = PKCS7_DETACHED, $extraCerts = null)
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{
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$this->signCertificate = 'file://'.str_replace('\\', '/', realpath($certificate));
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if (null !== $privateKey) {
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if (is_array($privateKey)) {
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$this->signPrivateKey = $privateKey;
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$this->signPrivateKey[0] = 'file://'.str_replace('\\', '/', realpath($privateKey[0]));
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} else {
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$this->signPrivateKey = 'file://'.str_replace('\\', '/', realpath($privateKey));
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}
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}
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$this->signOptions = $signOptions;
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if (null !== $extraCerts) {
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$this->extraCerts = str_replace('\\', '/', realpath($extraCerts));
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}
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return $this;
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}
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/**
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* Set the certificate location to use for encryption.
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*
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* @link http://www.php.net/manual/en/openssl.pkcs7.flags.php
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* @link http://nl3.php.net/manual/en/openssl.ciphers.php
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*
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* @param string|array $recipientCerts Either an single X.509 certificate, or an assoc array of X.509 certificates.
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* @param int $cipher
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*
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* @return Swift_Signers_SMimeSigner
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*/
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public function setEncryptCertificate($recipientCerts, $cipher = null)
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{
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if (is_array($recipientCerts)) {
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$this->encryptCert = array();
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foreach ($recipientCerts as $cert) {
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$this->encryptCert[] = 'file://'.str_replace('\\', '/', realpath($cert));
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}
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} else {
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$this->encryptCert = 'file://'.str_replace('\\', '/', realpath($recipientCerts));
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}
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if (null !== $cipher) {
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$this->encryptCipher = $cipher;
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}
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return $this;
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}
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/**
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* @return string
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*/
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public function getSignCertificate()
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{
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return $this->signCertificate;
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}
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/**
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* @return string
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*/
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public function getSignPrivateKey()
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{
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return $this->signPrivateKey;
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}
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/**
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* Set perform signing before encryption.
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*
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* The default is to first sign the message and then encrypt.
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* But some older mail clients, namely Microsoft Outlook 2000 will work when the message first encrypted.
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* As this goes against the official specs, its recommended to only use 'encryption -> signing' when specifically targeting these 'broken' clients.
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*
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* @param bool $signThenEncrypt
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*
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* @return Swift_Signers_SMimeSigner
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*/
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public function setSignThenEncrypt($signThenEncrypt = true)
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{
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$this->signThenEncrypt = $signThenEncrypt;
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return $this;
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}
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/**
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* @return bool
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*/
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public function isSignThenEncrypt()
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{
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return $this->signThenEncrypt;
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}
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/**
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* Resets internal states.
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*
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* @return Swift_Signers_SMimeSigner
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*/
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public function reset()
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{
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return $this;
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}
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/**
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* Change the Swift_Message to apply the signing.
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*
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* @param Swift_Message $message
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*
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* @return Swift_Signers_SMimeSigner
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*/
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public function signMessage(Swift_Message $message)
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{
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if (null === $this->signCertificate && null === $this->encryptCert) {
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return $this;
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}
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// Store the message using ByteStream to a file{1}
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// Remove all Children
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// Sign file{1}, parse the new MIME headers and set them on the primary MimeEntity
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// Set the singed-body as the new body (without boundary)
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$messageStream = new Swift_ByteStream_TemporaryFileByteStream();
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$this->toSMimeByteStream($messageStream, $message);
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$message->setEncoder(Swift_DependencyContainer::getInstance()->lookup('mime.rawcontentencoder'));
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$message->setChildren(array());
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$this->streamToMime($messageStream, $message);
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}
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/**
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* Return the list of header a signer might tamper.
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*
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* @return array
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*/
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public function getAlteredHeaders()
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{
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return array('Content-Type', 'Content-Transfer-Encoding', 'Content-Disposition');
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}
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/**
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* @param Swift_InputByteStream $inputStream
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* @param Swift_Message $mimeEntity
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*/
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protected function toSMimeByteStream(Swift_InputByteStream $inputStream, Swift_Message $message)
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{
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$mimeEntity = $this->createMessage($message);
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$messageStream = new Swift_ByteStream_TemporaryFileByteStream();
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$mimeEntity->toByteStream($messageStream);
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$messageStream->commit();
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if (null !== $this->signCertificate && null !== $this->encryptCert) {
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$temporaryStream = new Swift_ByteStream_TemporaryFileByteStream();
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if ($this->signThenEncrypt) {
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$this->messageStreamToSignedByteStream($messageStream, $temporaryStream);
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$this->messageStreamToEncryptedByteStream($temporaryStream, $inputStream);
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} else {
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$this->messageStreamToEncryptedByteStream($messageStream, $temporaryStream);
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$this->messageStreamToSignedByteStream($temporaryStream, $inputStream);
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}
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} elseif ($this->signCertificate !== null) {
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$this->messageStreamToSignedByteStream($messageStream, $inputStream);
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} else {
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$this->messageStreamToEncryptedByteStream($messageStream, $inputStream);
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}
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}
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/**
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* @param Swift_Message $message
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*
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* @return Swift_Message
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*/
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protected function createMessage(Swift_Message $message)
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{
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$mimeEntity = new Swift_Message('', $message->getBody(), $message->getContentType(), $message->getCharset());
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$mimeEntity->setChildren($message->getChildren());
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$messageHeaders = $mimeEntity->getHeaders();
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$messageHeaders->remove('Message-ID');
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$messageHeaders->remove('Date');
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$messageHeaders->remove('Subject');
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$messageHeaders->remove('MIME-Version');
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$messageHeaders->remove('To');
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$messageHeaders->remove('From');
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return $mimeEntity;
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}
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/**
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* @param Swift_FileStream $outputStream
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* @param Swift_InputByteStream $inputStream
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*
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* @throws Swift_IoException
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*/
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protected function messageStreamToSignedByteStream(Swift_FileStream $outputStream, Swift_InputByteStream $inputStream)
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{
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$signedMessageStream = new Swift_ByteStream_TemporaryFileByteStream();
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$args = array($outputStream->getPath(), $signedMessageStream->getPath(), $this->signCertificate, $this->signPrivateKey, array(), $this->signOptions);
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if (null !== $this->extraCerts) {
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$args[] = $this->extraCerts;
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}
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if (!call_user_func_array('openssl_pkcs7_sign', $args)) {
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throw new Swift_IoException(sprintf('Failed to sign S/Mime message. Error: "%s".', openssl_error_string()));
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}
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$this->copyFromOpenSSLOutput($signedMessageStream, $inputStream);
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}
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/**
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* @param Swift_FileStream $outputStream
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* @param Swift_InputByteStream $is
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*
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* @throws Swift_IoException
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*/
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protected function messageStreamToEncryptedByteStream(Swift_FileStream $outputStream, Swift_InputByteStream $is)
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{
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$encryptedMessageStream = new Swift_ByteStream_TemporaryFileByteStream();
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if (!openssl_pkcs7_encrypt($outputStream->getPath(), $encryptedMessageStream->getPath(), $this->encryptCert, array(), 0, $this->encryptCipher)) {
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throw new Swift_IoException(sprintf('Failed to encrypt S/Mime message. Error: "%s".', openssl_error_string()));
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}
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$this->copyFromOpenSSLOutput($encryptedMessageStream, $is);
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}
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/**
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* @param Swift_OutputByteStream $fromStream
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* @param Swift_InputByteStream $toStream
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*/
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protected function copyFromOpenSSLOutput(Swift_OutputByteStream $fromStream, Swift_InputByteStream $toStream)
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{
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$bufferLength = 4096;
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$filteredStream = new Swift_ByteStream_TemporaryFileByteStream();
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$filteredStream->addFilter($this->replacementFactory->createFilter("\r\n", "\n"), 'CRLF to LF');
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$filteredStream->addFilter($this->replacementFactory->createFilter("\n", "\r\n"), 'LF to CRLF');
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while (false !== ($buffer = $fromStream->read($bufferLength))) {
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$filteredStream->write($buffer);
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}
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$filteredStream->flushBuffers();
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while (false !== ($buffer = $filteredStream->read($bufferLength))) {
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$toStream->write($buffer);
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}
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$toStream->commit();
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}
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/**
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* Merges an OutputByteStream to Swift_Message.
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*
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* @param Swift_OutputByteStream $fromStream
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* @param Swift_Message $message
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*/
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protected function streamToMime(Swift_OutputByteStream $fromStream, Swift_Message $message)
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{
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$bufferLength = 78;
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$headerData = '';
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$fromStream->setReadPointer(0);
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while (($buffer = $fromStream->read($bufferLength)) !== false) {
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$headerData .= $buffer;
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if (false !== strpos($buffer, "\r\n\r\n")) {
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break;
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}
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}
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$headersPosEnd = strpos($headerData, "\r\n\r\n");
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$headerData = trim($headerData);
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$headerData = substr($headerData, 0, $headersPosEnd);
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$headerLines = explode("\r\n", $headerData);
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unset($headerData);
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$headers = array();
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$currentHeaderName = '';
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foreach ($headerLines as $headerLine) {
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// Line separated
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if (ctype_space($headerLines[0]) || false === strpos($headerLine, ':')) {
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$headers[$currentHeaderName] .= ' '.trim($headerLine);
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continue;
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}
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$header = explode(':', $headerLine, 2);
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$currentHeaderName = strtolower($header[0]);
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$headers[$currentHeaderName] = trim($header[1]);
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}
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$messageStream = new Swift_ByteStream_TemporaryFileByteStream();
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$messageStream->addFilter($this->replacementFactory->createFilter("\r\n", "\n"), 'CRLF to LF');
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$messageStream->addFilter($this->replacementFactory->createFilter("\n", "\r\n"), 'LF to CRLF');
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$messageHeaders = $message->getHeaders();
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// No need to check for 'application/pkcs7-mime', as this is always base64
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if ('multipart/signed;' === substr($headers['content-type'], 0, 17)) {
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if (!preg_match('/boundary=("[^"]+"|(?:[^\s]+|$))/is', $headers['content-type'], $contentTypeData)) {
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throw new Swift_SwiftException('Failed to find Boundary parameter');
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}
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$boundary = trim($contentTypeData['1'], '"');
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// Skip the header and CRLF CRLF
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$fromStream->setReadPointer($headersPosEnd + 4);
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while (false !== ($buffer = $fromStream->read($bufferLength))) {
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$messageStream->write($buffer);
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}
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$messageStream->commit();
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$messageHeaders->remove('Content-Transfer-Encoding');
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$message->setContentType($headers['content-type']);
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$message->setBoundary($boundary);
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$message->setBody($messageStream);
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} else {
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$fromStream->setReadPointer($headersPosEnd + 4);
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if (null === $this->headerFactory) {
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$this->headerFactory = Swift_DependencyContainer::getInstance()->lookup('mime.headerfactory');
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}
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$message->setContentType($headers['content-type']);
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$messageHeaders->set($this->headerFactory->createTextHeader('Content-Transfer-Encoding', $headers['content-transfer-encoding']));
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$messageHeaders->set($this->headerFactory->createTextHeader('Content-Disposition', $headers['content-disposition']));
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while (false !== ($buffer = $fromStream->read($bufferLength))) {
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$messageStream->write($buffer);
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}
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$messageStream->commit();
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$message->setBody($messageStream);
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}
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}
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}
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