W.I.P of SMIME support for mail application

api/src/Mail/Smime.php

@@ -0,0 +1,118 @@
+<?php
+/**
+ * EGroupware Api: generic base class for SMIME
+ *
+ * @link http://www.egroupware.org
+ * @package api
+ * @subpackage mail
+ * @author Hadi Nategh <hn@egrupware.org>
+ * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License Version 2+
+ * @version $Id$
+ */
+
+namespace EGroupware\Api\Mail;
+
+use EGroupware\Api;
+use Horde_Crypt_Exception;
+use Horde_Crypt_Translation;
+use Horde_Crypt_Smime;
+
+/**
+ * EMailAdmin generic base class for SMTP
+ */
+class Smime extends Horde_Crypt_Smime
+{
+
+	/**
+	 * openssl binary path
+	 *
+	 * @var string
+	 */
+	protected $sslpath;
+
+	static $SMIME_TYPES = array (
+		'application/pkcs8',
+		'application/pkcs7',
+		'application/pkcs10',
+		'application/pkcs8',
+		'multipart/signed',
+		'application/x-pkcs7-signature',
+		'application/x-pkcs7-mime'
+	);
+	/**
+     * Constructor.
+     *
+     * @param Horde_Crypt_Smime $smime  S/MIME object.
+     */
+    public function __construct($params = array())
+    {
+		parent::__construct($params);
+		$mailconfig = Api\Config::read('mail');
+		$this->sslpath = $mailconfig['opensslpath']? $mailconfig['opensslpath']: '';
+    }
+
+	/**
+	 * Check if a given mime type is smime type
+	 *
+	 * @param string $_mime mime type
+	 *
+	 * @return boolean returns TRUE if the given mime is smime
+	 */
+	public static function isSmime ($_mime)
+	{
+		return in_array($_mime, self::$SMIME_TYPES);
+	}
+
+	/**
+	 * Check if the openssl is supported
+	 *
+	 * @return boolean returns True if openssl is supported
+	 */
+	public function enabled ()
+	{
+		try
+		{
+			$this->checkForOpenSSL();
+		} catch (Exception $ex) {
+			return false;
+		}
+		return true;
+	}
+
+	/**
+	 * Extract Certificates from given PKCS7 data
+	 *
+	 * @param string $pkcs7
+	 * @return string returns
+	 * @throws Horde_Crypt_Exception
+	 */
+	public function extractCerticatesFromPKCS7 ($pkcs7)
+	{
+		$this->checkForOpenSSL();
+		
+		// Create temp file for input
+        $input = $this->_createTempFile('smime-pkcs7');
+		$output = $this->_createTempFile('smime-pkcs7-out');
+        /* Write text to file. */
+        file_put_contents($input, $pkcs7);
+
+		exec($this->sslpath . ' pkcs7 -print_certs -inform der -in ' . $input . ' -outform PEM -out ' . $output);
+
+		$ret = file_get_contents($output);
+
+		if ($ret) return $ret;
+		throw new Horde_Crypt_Exception(Horde_Crypt_Translation::t("OpenSSL error: Could not extract certificates from pkcs7 part."));
+	}
+
+	/**
+     * Extract the contents from signed S/MIME data.
+     *
+     * @param string $data     The signed S/MIME data.
+	 *
+     * @return string  The contents embedded in the signed data.
+     * @throws Horde_Crypt_Exception
+     */
+	public function extractSignedContents ($data) {
+		return parent::extractSignedContents($data, $this->sslpath);
+	}
+}